CA2114888C - Method of forming structural panel assemblies - Google Patents
Method of forming structural panel assembliesInfo
- Publication number
- CA2114888C CA2114888C CA002114888A CA2114888A CA2114888C CA 2114888 C CA2114888 C CA 2114888C CA 002114888 A CA002114888 A CA 002114888A CA 2114888 A CA2114888 A CA 2114888A CA 2114888 C CA2114888 C CA 2114888C
- Authority
- CA
- Canada
- Prior art keywords
- panel
- support members
- planar
- panels
- polymeric adhesive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/1228—Joining preformed parts by the expanding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G11/00—Applying adhesives or glue to surfaces of wood to be joined
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/08—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers using foamed adhesives
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
- E04C2/38—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure with attached ribs, flanges, or the like, e.g. framed panels
- E04C2/386—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure with attached ribs, flanges, or the like, e.g. framed panels with a frame of unreconstituted or laminated wood
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2475/00—Presence of polyurethane
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Finishing Walls (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Floor Finish (AREA)
- Laminated Bodies (AREA)
Abstract
The method of forming rigid panel assemblies of this invention eliminates the requirement for mechanical fasteners and may be used to bond wall boards to studs, floor joists to wood flooring such a plywood or OSB boards and trusses to ceiling panel. The method of this invention includes applying a thin bead of a thoroughly mixed two-component liquid polyurethane foamable resin adhesive on the surface where the components are to be joined. The foamable resin is formulated to provide a long tack time or delay curing until the assembly is complete. The foamable resin is then allowed to cream and rise before bonding. Where the bead is applied to the side faces of the support members, the support members are preferably turned to orient the foam beads over the fibrous panel, which is preferably supported on a flat horizontal support surface. Finally, the beads are compressed against the fibrous panel, wetting the panel with liquid foam resin before the foam has gelled, permanently bonding the support member to the panel and forming the structural panel assembly. Where an enclosed panel assembly, such as a closed wall is desired, the structural members are attached to a first panel, orienting the support members for application of the polyurethane foam bead, as described.
Description
'~ 60,676-051 ~, , jt!l ~
METHOD OF FORMING STRUCTURAL PANEL ASSEMBLIES
BACKGROUND OF THE INVENTION
The present invention relates to a method of making prefabricated relatively rigid structural panel assemblies, such as prefabricated wall, flooring and ceiling assemblies used by the prefabricated or factory built construction industry, such as the manufactured housing industry. The panels are permanently attached to reinforcing studs, joists or trusses, forming a relatively rigid prefabricated module. Closed wall modules include a pair of parallel panels forming the wall surfaces and a plurality of transverse studs permanently attached to the wall boards.
The method of this invention is particularly, but not exclusively, adapted to a process for making such structural panel assemblies without the requirement of mechanical f~teners, such as nails, staples or screws to secure the panel to the structural members, which must be in most cases covered with batten strips. A problem with the manufacture of prefabricated wall, floor or ceiling panel assemblies has been that the components are not uniform. The boards used for studs, joists and trusses do not have a level or straight plane and may have other discrepancies, such as knot holes. The fibrous panels to which such support members are attached are somewhat flexible, but are often warped. Thus, a wall, floor or ceiling panel, which is supported by studs, joists or trusses attached by mechanical fasteners, is generally both warped and spaced from the reinforcing members in many locations. The exposed surfaces of the mechanical fasteners must also generally be covered, fasteners pop out after construction because inherent assembly and/or user movement and 60,676-051 stresses resulting from the warped co.,lponents. These problems can only be partially solved in "stick built" construction, where the wall, floor or ceiling panel assemblies are built entirely on site, by selection of m~t~ , the use of shims, etc. However, factory or pre-built construction preferably utilizes mass production techniques which do not lend themselves to such hand-made adjustments.
United States Patent Nos. 4,244,901 and 4,748,781, assigned to the ~si~nee of this application, disclose methods of forming reinforced panel assemblies utilizing polyu~lhane foam to bond the structural support members to the panels. In the prer~l,ed embodiment, the panel is laid upon a flat support surface. The studs or support members are located on the back of the panel and clamped. A high pressure stream of a liquid foamable resin is then directed to the juncture of the support members and the panel, such that the resin foams and fills the space between the support members and the panel, permanently bonding the support members to the panel without mechanical f~ctening means. This method has been commercially successful in making prefabricated or factory-built structural panels; however this process is not suitable for enclosed panel construction, such as a closed wall structural assembly.
The method of this invention has advantages over the prior art and is suitable for the manufacture of enclosed panel structures, such as closed wall assemblies used by the manufactured construction industry. The disclosed method may be substantially aulomated and utili~s a relatively small amount of foamable resin adhesive. The method of this invention may also be used at any lel-~ ture normally encountered by the factory-built .
r B
60,676-051 construction industry. Upon completion of the reinforced panel assembly, the assembly can be moved almost immediately using conventional mass production m~teri~l handling techniques.
SUMMARY OF THE INVENTION
As stated, the method of this invention is particularly suited for the manufacture of reinforced structural fibrous panels, such as used by the manufactured construction industry for walls, floors and ceilings. The method of this invention may also be adapted for mass production techniques utili7ing the materials now used by the prefabricated or factory-built construction industry.
In the method of this invention, the reinforcing members, which may be wall studs, ceiling trusses or floor joists for example are oriented and supported vertically, such that the relatively thin side faces are located at the top of the support member. Where an enclosed structural assembly, such as a closed wall is to be manufactured, the support members are preferably first attached to one panel and the panel is supported on a horizontal surface, such that the support members extend vertically from the first panel. The support members may be attached to the first panel by the method disclosed in the above-referenced U.S. Patent Nos. 4,244,901 or 4,748,781. As disclosed in U.S. Patent 4,748,781, the structural support members may also be metal channels.
21 1 4888 ~
60,676-051 The method of this invention then includes applying a thin bead of a thoroughly mixed two-component liquid polyurethane foamable resin adhesive axially along the top side surfaces of each of the support members. The foamable resin adhesive must have a relatively long tack time and is preferably resilient or pliable, having good wetting characteristics, green strength and fast reacting with controlled cure, such that the time that the foam remains resilient and tacky can be extended and controlled. The plefelled foamable resin is of relative low viscosity and is also thixotropic, such that the resin can be thoroughly mixed in an impingement mixing chamber of an application gun, but such that the bead does not run upon application. The foam is then allowed to subst~nti~lly fully cream and rise, forming a liquid foam polyurethane bead. The support surfaces of the support members having the foamed polyurethane bead are then pressed against the panel to be joined to the support members, colllples~ g the polyurethane beads and wetting the panel, permanently bonding the support members to the panel, without requiring mechanical f~teners. This must be completed before the polyurethane foam beads cure tack free or the polyurethane foam will not wet the surface of the panel and bond sufficiently.
In certain applications, such as where the application gun is coml)uler controlled, it may be desirable to apply the foam bead to the panel first, rather than the support members.
In such an application, the panel will be laid upon a flat support surface. A predetermined pattern of polyurethane beads are then applied to the panel with the pattern of beads corresponding to the desired locations for the support member. Where a double walled structure is to be made, the structural support members are first applied to a second panel, as described, or the support members may be supported in a fixture. The side faces of the B
' 2114888 60,676-051 support members are then applied to the polyurethane beads, permanently bonding the structural support members to the panel, as described.
In the most preferred method, the panel which is to be bonded to the support members is first laid upon a flat horizontal support surface. After applying the bead to the support members, the support members are turned or rotated to orient the surface having the polyurethane foam bead downwardly over the flat panel and the support surfaces are then pressed against the panel to co~ ress the foam beads, wetting the panel surface and permanently bonding the support members to the panel. The foam beads thus fill in any imperfections or warped areas of the reinforcing support members and the panel remains flat following attachment of the support members. Further, neither the panel nor the support members are stressed during attachment and no mechanical fastening means is required.
The polyurethane foam bead is preferably applied axially along substantially the entire length of the reinforcing support members at a relatively slow forward velocity to avoid splatter and assure a good bond between the structural reinforcing members and the panel.
To avoid splatter, the gun should be moved at about the forward velocity of the resin exiting the gun. A liquid resin bead having a width of about 1/4 inch applied at an application rate of less than about 3 feet per second has been found suitable for most hand applications. A
two-component liquid foamable polyurethane resin adhesive is also plefel,ed. The foamable resin adhesive should be relatively slow acting and the formulation is preferably adjustable to accommodate the environment of the application. In the most preferred embodiment, the liquid polyurethane foamable resin begins to cream almost immediately and substantially fully 21 1 4888 ~
60,676-051 rises within a few minutes, such that the foam bead is ready for bonding, as descAbed. The foam bead must be pressed against the panel or structural member before the foam cures or the foam will not satisfactorily wet and bond sufficiently. Thus, the polyurethane foam should be formulated for the particular application. In the most prefelled embodiment, the foam fully rises quickly, but the foam does not cure tack free for at least 10 minutes and may, if preferred, not cure for about 20 minutes. In most l,refell~d applications, a polyurethane foam which cures in 15 to 20 minutes has been found to be particularly suitable for mass production applications.
The method of making a structural panel assembly of this invention is thus particularly suitable for the manufacture of prefabricated or factory-built reinforced fibrous panel assemblies, including rigid enclosed panel assemblies, such as closed wall modules used by the construction industry. A closed wall assembly may be built by the method of this invention without using mechanical fasteners or clamps and both walls may be substantially perfectly flat using mass production techniques. The leillfolced wall construction may be handled using industrial mass handling techniques almost immediately upon completion of the bond and without requiring clamps. Other advantages and meritorious features of the method of this invention will be more fully understood from the following description of the plerell~d embodiments, the appended claims and the drawings, a brief description of which follows.
B
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60,676-051 BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a perspective view of a panel assembly illustrating the application of a foam bead on the structural support members;
Figure 2 is a partial end view of a structural support member immediately after the application of a bead of liquid foamable resin adhesive;
Figure 3 is a partial end view of a structural support member, similar to Figure 2, after the bead has substantially fully creamed and risen;
Figure 4 is an end view of a structural support member bonded to a finish panel;
Figure S is a top p~ ,eclive view illustMting a preferred method of applying the structural support members to the finish panel;
Figure 6 is a side view of a rigid structural panel assembly formed by the method of this invention;
Figure 7 is another side view of a rigid structural panel assembly formed by the method of this invention:
60,676-051 Figure 8 is a side view of an impingement mixing chamber of a foam application gun suitable for use in the method of this invention; and Figure 9 is a side cross-sectional view of the mixing chamber shown in Figure 8.
DESCRIPTION OF THE PREFERRED
EMBODIMENTS OF THE METHOD OF THIS INVENTION
As described above, the method or process of this invention is particularly suitable for making structural panel assemblies without re~uiring mechanical fasteners. The method of this invention will form panel assemblies having a completely flat finish panel, although the structural support members are warped or irregular and the panel was initially warped or "wowed." The structural panel assemblies which may be formed by the method of this invention, include prefabricated wall, flooring and ceiling assemblies roof decking and outside walls such as used by the manufactured housing, recreational vehicle and prefabricated industrial building industries. The method of this invention may also be used to make closed wall modules having parallel panels supported by studs permanently adhesively bonded to the panels.
Figure 1 illustrates a method of forming a first panel assembly 20 as may be utilized in the method of this invention. As shown, the panel assembly 20 includes a plurality of generally parallel structural members 22a, 22b and 22c which have been secured to a first panel 24 by foam resin adhesive as described, for example, in the above-referenced U.S.
60,676-051 Patent No. 4,244,901. Such structural support members 22 are commonly referred to as studs in wall assemblies, joists in floor assemblies and trusses in ceiling assemblies. In the disclosed embodiment of the first panel assembly 20, the structural support members 22 are wood, such as the wood 2x4's commonly used for studs in wall assemblies. It will be understood, however, that the structural support members 22 may be formed of any m~teri~l used by the construction industry, including the channel-shaped metal structural support members disclosed in U.S. Patent No. 4,748,781 and the structural support members may be secured to the first panel 24 by any suitable means, including mechanical fasteners.
However, as described in the above-referenced U.S. patents, the structural members 22 may be bonded to the first panel 24 by a thin high pressure stream of polyurethane foam adhesive directed to the base of the structural members, forming a flat panel assembly.
In the method of this invention, a thin bead 28 of a thoroughly mixed two-component liquid polyurethane foamable resin adhesive is applied to the thin side faces 29 of the structural members which are to be bonded to the finish panel, as described below. As shown, the foamable resin adhesive is applied to the structural members by a foam application gun 40. The disclosed embodiment of the foam application gun includes lines or hoses 32a and 32b which receive and deliver the A-isocyanate and B-resin components of the foamable resin adhesive, to an impingement mixing chamber 34 described more fully hereinbelow, a trigger assembly 36, a pneumatic cylinder assembly 38 and a manual screw adjustment assembly 40 which adjusts the throw of the valve rod shown in Figures 8 and 9.
The disclosed embodiment of the application gun 30 is a commercially available Model D
spray gun sold by Gusmer Corp. of I ~kewood, New Jersey. Of course, other 60,676-051 two-component liquid foamable resin adhesive spray guns having a high velocity impingement mixing chamber or module can also be used. Another suitable foam application gun is the Model GX-7 gun having a high impingement module available from Gusmer Corp.
Although conventional two-component foam spray guns may be used, the gun must be modified or adjusted, as described below, to produce a relatively low forward velocity stream of thoroughly mixed polyurethane foam resin adhesive to produce a relatively thin bead of foamed resin adhesive for the method of this invention.
In the method disclosed in Figure 1, a thin foam bead 28a of liquid foamable resin adhesive is being applied to the top face 29 of structural support member 22a by foam application gun 30. The first panel assembly 20 may be supported on a horizontal surface or angled to reduce floor space. The gun is preferably moved at about the forward velocity of the liquid stream of polyurethane foamable resin adhesive exiting the application gun 30, such that there is substantially no splatter. The gun may be hand-held, as shown, or the gun may be supported on an application machine which may be computer controlled. As shown in Figure 1, the bead 28a is very thin, as applied. The liquid foamable resin adhesive bead begins to cream and rise, however, almost immediately following application, such that the bead is substantially fully creamed and expanded as shown at 28b (see Figure 3) within a few seconds after application, preferably less than 3 seconds. In a typical application where the foam bead is applied to the thin face of a 2x4 inch structural support member, a liquid bead having a width of about 1/4 inch upon application has been found to be very effective. The bead then creams and rises to about double the original height and width, or about 1/2 inch, as shown at 28b and 28c in Figure 1 and 28b in Figure 3.
60,676~51 A two-component polyurethane foamable resin adhesive was especially formulated for the method of this invention. As described, the forward velocity of the liquid foamable resin adhesive exiting from the application gun is relatively low to form a bead without splatter, preferably less than about 5 feet per second or about 1 to 3 feet per second for hand-held gun applications. The A and B components of the foamable polyurethane resin must, however, be thoroughly mixed before application. To achieve thorough mixing, an application gun having a relatively high pressure impingement mixing chamber was selected and used with relatively low viscosity liquid foamable resin components. When applied, however, the foamable resin bead should not run. To achieve this result, a thixotropic formulation was developed which begins to cream and rise almost immediately upon application, but at the same time has an extended rate of cure time.
Further, as described, the method of this invention is particularly suitable for forming wall, ceiling and flooring assemblies for prefabricated construction industries, such as the manufactured housing industry. Thus, the polyurethane foamable resin is preferably formulated for use at a relatively wide range of ambient le--lpelatul~s, preferably between about 30 and 100 degrees Fahrenheit. Humidity should not adversely affect the resultant bond. Finally, the method of this invention is also suitable for mass production of structural panel assemblies, including automated assembly processes. Thus, the foamable resin adhesive preferably sets up and cures in a controlled manner. In most applications, it is p-er~lled that the foamable resin adhesive cures in about 10 to 30 minutes, permitting completion of the assembly before the foam beads fully cure tack free. For most applications, the foamable resin adhesive should fully rise in less than 2 minutes and cure in 2114~88 60,676-051 15 to 25 minutes at the ambient tellll)eld~UlC; where the beads are applied. Of course, the foamable resin adhesive must also provide an excellent bond between the structural support members and the panel. To accomplish good bonding with the method of this invention, the foam bead must have good wetting characteristics, a relatively long tack time and good green strength. As described, the reinforced panel assembly formed by the method of this invention can be picked up and handled almost immediately following completion of the assembly.
Current polyurethane systems used by the factory-built construction industry include single component moisture cured polyurethane foams and dual component static mix systems.
With the moisture cure process, the manufacturer is limited in its use because the cure/set time varies from 0.75 hours to more than 1.5 hours. The dual component polyurethane systems presently available use a static mix process that is both costly and involves a solvent flush, such as methylene chloride. With a solvent flush, the uses are limited because of environmental problems and hazardous waste disposal requirements. The two-component polyurethane foamable resin adhesive of this invention is water blown and mixed in the application gun, elimin~ing the requirement for static mixing, solvent cleaning and the like and permitting use in the method of this invention.
60,676-051 The following formulation was developed by Applicant for the B polyol side of the resin adhesive:
ConstituentWeight Percent PG 76-120 90 - 92%
R 420 4.5 - 5.5 %
L 5420 1.4 - 1.45 %
H2O 2.5 - 2.6%
PG 76-120 is a polyether polyol available from Olin Corp. PG 76-120 has improved wetting characteristics, reduced viscosity and improves the plyability of the polyurethane foam. It also reduces friability and reduces stryration or cryst~lli7~tion. R 420 is also a polyether polyol available from Texaco Chemical Co. which provides improved reactivity. L 5420 is a silicone surfactant available from Union Carbide Chemicals & Plastics Co., Inc. The H20 is distilled water. The A-isocyanate side of the formulation is lOO percent methylene bis 4-phenyl-isocyarate available from Miles Inc. and ICI Americas, Inc.
The above formulation is suitable for applications at most ambient le...pel~tures encountered under production conditions greater than about 45~F. At lower ambient te---pel~ res or t~---pe ~ res between about 30~F and 65~F, the following formulation has been found to be particularly suitable for the B polyol side of the foamable resin adhesive:
-- 60,676-051 Constituent Wei~ht Percent PG 76-120 73 - 76%
R 42020 - 22%
L 54201.~ %
33 LV0.6%
H2O 2.2%
33 LV is an amine catalyst available from Union Carbide Chemical & Plastics Co. As will be understood by those skilled in the art, adjusting the polyether polyol ratio and adding an amine catalyst makes the foam formulation "hotter", providing a good foam bead at colder ambient temperatures. The A iso side of the formulation may be the same as the formulation described above.
The green sheer strength of the described foam resin adhesive utilized in the method of this invention is as follows:
TimeSheer Strength 10 min. 117.00 psi 11 min. 121.30 psi 13 min. 136.80 psi 17 min. 199.00 psi 20 min. 254.80 psi 24 hours604.30 psi Thus, the reinforced panel assembly formed by the method of this invention can be picked up and handled by conventional material handling techniques within a few minutes after bonding.
60,676-051 After the foam bead 28 is applied, as shown in Figure 1 at 28a, the bead is allowed to substantially fully cream and rise, forming an enlarged foam bead on the surface 29 of the structural support members which are to be bonded to the finish panel 50. As shown in Figure 4, the finish panel 50 may be applied on top of the bead and pressed. More preferably, the first panel assembly 20 may be turned as shown in Figure 5 and the support members applied to the finish panel supported on a flat surface, such as a vacuum table 52.
In either method, the volume of the bead 28b should be sufficient to completely bridge the mating surfaces of the finish panel 50 and the structural support members 22 as shown in Figure 4. Where a flat finish panel is desired, the panel is first laid on a flat support surface, such as the vacuum table 52 shown in Figure 5. A vacuum table having a plurality of holes 54 may be desired where the panel is relatively flexible, but is warped or includes "wows". Vacuum tables are commonly used to maintain a flexible sheet, board or panel flat while it is being worked upon.
As stated above, Figure 5 illustrates a prere~led embodiment of the method of this invention. As shown, the first panel assembly 20 is turned or rotated, such that the beads 28 overlie the finish panel 50, which is supported on the vacuum table 52, as described above.
The first panel assembly 20 is then pressed against the finish panel, compressing the beads 28 against the finish panel. The polyurethane foam then wets the finish panel, forming a bridge between the finish panel 50 and the structural support members 22, as shown in Figure 4.
Thus, it is necessary to complete this step before the polyurethane foam beads fully cure tack free. Further, the polyurethane foam beads must be sufficiently flexible to bridge the interface between the structural members and the finish panel. The completed structural 60,676-051 panel assembly may be lifted and handled almost immediately upon pressing of the structural members 22 against the finish panel. That is, the bonding is almost instantaneous, which is an impo~ t advantage of the method of this invention.
Figures 6 and 7 illustrate structural panel assemblies formed by the method of this invention. As described above, the finish panel 50 is preferably first laid upon a flat surface 51. In the disclosed embodiment, the flat surface is provided by a vacuum table 52 having a plurality of spaced holes 54. A vacuum is drawn on the underside of the table 52 which dMws the panel 50 against the flat surface 51, ironing out any warpage or "wow" in the flexible panel 50. Figure 6 illustrates a common situation where the structural support members 22 are of different widths. As stated above, the structural support members 22 are commonly 2x4's or 4x6's as used for studs in wall panel assemblies, joists in flooring assemblies and trusses in ceiling assemblies. The dimensions of such lumber, however, vary significantly. The long side may vary as much as 1/2 inch. As shown, however, the foam bead 28 fills in the additional space required by the thinner structural members, such that the finish panel 50 remains completely flat. Figure 7 illustrates the situation where the structural member 22 is warped or bowed. As shown the foam bead 28 will ~imil~rly fill the concave areas, such that the finish panel 50 remains flat. As described, the finish panel is retained flat on the vacuum table 52 when the first panel assembly is turned and applied to the finish panel, as shown in Figure 5.
Figures 8 and 9 illustrate a mixing chamber 60 of the foam application gun 30 of Figure 1. The mixing chamber 60 includes a cylindrical body 62 having an axially bore 64 21 14888 ~
which defines the mixing chamber. The end 66 is externally threaded to receive a nozzle (not shown) and the opposite end is counterbored at 68 to receive a ferrule 72 and internally threaded to receive a p~cking or lock nut 70. A valve rod 76 is reciprocated in the axial bore 64 by the pneumatic cylinder assembly 38 of Figure 1 as described below.
When the value rod is retracted, the A and B components of the foam resin adhesive enter the mixing chamber 64 ~ PJy through very small slots 82 on opposite sides of the valve body 62. Hardened inserts 80 may be provided to reduce wear. The slots have a width of about V2 the ~ meter of the bore mix chamber 64, such that the high impingement force of the foamable resin col--ponent~ entering the chamber is dissipated sufficiently to generate a low velocity bead, as described above. In an actual embodiment, the width of the slot 82 was 0.046 inches and the diameter of the bore mixing chamber 64 was 0.078 inches.
The viscosity of the A iso side was 250 cps and the B polyol side was 560 cps. The inlet **
pressure was 400 psi. The A and B co---ponents were thoroughly mixed in the high impingement mixing chamber and exited the bore at about 3 feet per second, forming a relatively thin bead of foamed resin adhesive without splatter, as described above.
* cps = centipoise * * psi = pounds per square inch The foam application gun 30 shown in Figure 1 is operated by actuating the trigger mechanism 36, which operates the pneum~tic cylinder to retrack the valve rod 76 beyond the slot 82, permitting the A iso and B polyol co~-,pollents of the foamable resin to enter the mixing chamber 64 under high impingement pressure, where the components are thoroughly mixed. The foamable resin adhesive then exits the outlet 86 of the mixing chamber, where it is applied in the form of a thin liquid bead 28a as shown in Figures 1 and 2. Almost Bi-~J
60,676451 immediately, the liquid bead creams and rises, forming the foam beads 28b and 28c as shown in Figures 1 and 3. The application gun 30 may be hand-held or the gun may be supported on a movable fixture and co,-,L,uler-controlled, for example. Where the gun is computer-controlled, it may be pl~relled to apply the foam beads first to the finish panel 50.
The structural support members may be secured to a first panel 24 as shown in Figure 1, or the structural support members 22 may be oriented and supported in a jig or fixture, elimin~ting the re~uirement for a first panel in a floor assembly, for example.
The foam 28 preferably substantially fully bridges the interface between the structural support members 22 and the finish panel 50 as shown in Figure 4, such that the finish panel 50 does not contact the structural support members 22. The cellular foam adhesive provides a resilient joint between the structural support members and the finish panel and a thermal break. These advantages are provided even where the foam bead is inlellupted at predetermined locations to reduce cost.
As will be understood by those skilled in the art, various modifications may be made to the method of forming structural panel assemblies of this invention and the resultant improved rigid structural panel assembly within the purview of the appended claims. For example, the structural support members 22 may be attached to the first panel 24 by any suitable means, including mechanical fasteners, although the use of foam adhesives had several advantages over the prior art, as described above. Further, although an important advantage of the method of this invention is the elimin~tion of mechanical fasteners, mechanical fasteners may also be used between the finish panel and the structural support B-60,676-051 members. Finally, although the foam resin bead is preferably applied to the structural members, as described above, the bead may alternatively be applied first to the finish panel.
METHOD OF FORMING STRUCTURAL PANEL ASSEMBLIES
BACKGROUND OF THE INVENTION
The present invention relates to a method of making prefabricated relatively rigid structural panel assemblies, such as prefabricated wall, flooring and ceiling assemblies used by the prefabricated or factory built construction industry, such as the manufactured housing industry. The panels are permanently attached to reinforcing studs, joists or trusses, forming a relatively rigid prefabricated module. Closed wall modules include a pair of parallel panels forming the wall surfaces and a plurality of transverse studs permanently attached to the wall boards.
The method of this invention is particularly, but not exclusively, adapted to a process for making such structural panel assemblies without the requirement of mechanical f~teners, such as nails, staples or screws to secure the panel to the structural members, which must be in most cases covered with batten strips. A problem with the manufacture of prefabricated wall, floor or ceiling panel assemblies has been that the components are not uniform. The boards used for studs, joists and trusses do not have a level or straight plane and may have other discrepancies, such as knot holes. The fibrous panels to which such support members are attached are somewhat flexible, but are often warped. Thus, a wall, floor or ceiling panel, which is supported by studs, joists or trusses attached by mechanical fasteners, is generally both warped and spaced from the reinforcing members in many locations. The exposed surfaces of the mechanical fasteners must also generally be covered, fasteners pop out after construction because inherent assembly and/or user movement and 60,676-051 stresses resulting from the warped co.,lponents. These problems can only be partially solved in "stick built" construction, where the wall, floor or ceiling panel assemblies are built entirely on site, by selection of m~t~ , the use of shims, etc. However, factory or pre-built construction preferably utilizes mass production techniques which do not lend themselves to such hand-made adjustments.
United States Patent Nos. 4,244,901 and 4,748,781, assigned to the ~si~nee of this application, disclose methods of forming reinforced panel assemblies utilizing polyu~lhane foam to bond the structural support members to the panels. In the prer~l,ed embodiment, the panel is laid upon a flat support surface. The studs or support members are located on the back of the panel and clamped. A high pressure stream of a liquid foamable resin is then directed to the juncture of the support members and the panel, such that the resin foams and fills the space between the support members and the panel, permanently bonding the support members to the panel without mechanical f~ctening means. This method has been commercially successful in making prefabricated or factory-built structural panels; however this process is not suitable for enclosed panel construction, such as a closed wall structural assembly.
The method of this invention has advantages over the prior art and is suitable for the manufacture of enclosed panel structures, such as closed wall assemblies used by the manufactured construction industry. The disclosed method may be substantially aulomated and utili~s a relatively small amount of foamable resin adhesive. The method of this invention may also be used at any lel-~ ture normally encountered by the factory-built .
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60,676-051 construction industry. Upon completion of the reinforced panel assembly, the assembly can be moved almost immediately using conventional mass production m~teri~l handling techniques.
SUMMARY OF THE INVENTION
As stated, the method of this invention is particularly suited for the manufacture of reinforced structural fibrous panels, such as used by the manufactured construction industry for walls, floors and ceilings. The method of this invention may also be adapted for mass production techniques utili7ing the materials now used by the prefabricated or factory-built construction industry.
In the method of this invention, the reinforcing members, which may be wall studs, ceiling trusses or floor joists for example are oriented and supported vertically, such that the relatively thin side faces are located at the top of the support member. Where an enclosed structural assembly, such as a closed wall is to be manufactured, the support members are preferably first attached to one panel and the panel is supported on a horizontal surface, such that the support members extend vertically from the first panel. The support members may be attached to the first panel by the method disclosed in the above-referenced U.S. Patent Nos. 4,244,901 or 4,748,781. As disclosed in U.S. Patent 4,748,781, the structural support members may also be metal channels.
21 1 4888 ~
60,676-051 The method of this invention then includes applying a thin bead of a thoroughly mixed two-component liquid polyurethane foamable resin adhesive axially along the top side surfaces of each of the support members. The foamable resin adhesive must have a relatively long tack time and is preferably resilient or pliable, having good wetting characteristics, green strength and fast reacting with controlled cure, such that the time that the foam remains resilient and tacky can be extended and controlled. The plefelled foamable resin is of relative low viscosity and is also thixotropic, such that the resin can be thoroughly mixed in an impingement mixing chamber of an application gun, but such that the bead does not run upon application. The foam is then allowed to subst~nti~lly fully cream and rise, forming a liquid foam polyurethane bead. The support surfaces of the support members having the foamed polyurethane bead are then pressed against the panel to be joined to the support members, colllples~ g the polyurethane beads and wetting the panel, permanently bonding the support members to the panel, without requiring mechanical f~teners. This must be completed before the polyurethane foam beads cure tack free or the polyurethane foam will not wet the surface of the panel and bond sufficiently.
In certain applications, such as where the application gun is coml)uler controlled, it may be desirable to apply the foam bead to the panel first, rather than the support members.
In such an application, the panel will be laid upon a flat support surface. A predetermined pattern of polyurethane beads are then applied to the panel with the pattern of beads corresponding to the desired locations for the support member. Where a double walled structure is to be made, the structural support members are first applied to a second panel, as described, or the support members may be supported in a fixture. The side faces of the B
' 2114888 60,676-051 support members are then applied to the polyurethane beads, permanently bonding the structural support members to the panel, as described.
In the most preferred method, the panel which is to be bonded to the support members is first laid upon a flat horizontal support surface. After applying the bead to the support members, the support members are turned or rotated to orient the surface having the polyurethane foam bead downwardly over the flat panel and the support surfaces are then pressed against the panel to co~ ress the foam beads, wetting the panel surface and permanently bonding the support members to the panel. The foam beads thus fill in any imperfections or warped areas of the reinforcing support members and the panel remains flat following attachment of the support members. Further, neither the panel nor the support members are stressed during attachment and no mechanical fastening means is required.
The polyurethane foam bead is preferably applied axially along substantially the entire length of the reinforcing support members at a relatively slow forward velocity to avoid splatter and assure a good bond between the structural reinforcing members and the panel.
To avoid splatter, the gun should be moved at about the forward velocity of the resin exiting the gun. A liquid resin bead having a width of about 1/4 inch applied at an application rate of less than about 3 feet per second has been found suitable for most hand applications. A
two-component liquid foamable polyurethane resin adhesive is also plefel,ed. The foamable resin adhesive should be relatively slow acting and the formulation is preferably adjustable to accommodate the environment of the application. In the most preferred embodiment, the liquid polyurethane foamable resin begins to cream almost immediately and substantially fully 21 1 4888 ~
60,676-051 rises within a few minutes, such that the foam bead is ready for bonding, as descAbed. The foam bead must be pressed against the panel or structural member before the foam cures or the foam will not satisfactorily wet and bond sufficiently. Thus, the polyurethane foam should be formulated for the particular application. In the most prefelled embodiment, the foam fully rises quickly, but the foam does not cure tack free for at least 10 minutes and may, if preferred, not cure for about 20 minutes. In most l,refell~d applications, a polyurethane foam which cures in 15 to 20 minutes has been found to be particularly suitable for mass production applications.
The method of making a structural panel assembly of this invention is thus particularly suitable for the manufacture of prefabricated or factory-built reinforced fibrous panel assemblies, including rigid enclosed panel assemblies, such as closed wall modules used by the construction industry. A closed wall assembly may be built by the method of this invention without using mechanical fasteners or clamps and both walls may be substantially perfectly flat using mass production techniques. The leillfolced wall construction may be handled using industrial mass handling techniques almost immediately upon completion of the bond and without requiring clamps. Other advantages and meritorious features of the method of this invention will be more fully understood from the following description of the plerell~d embodiments, the appended claims and the drawings, a brief description of which follows.
B
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60,676-051 BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a perspective view of a panel assembly illustrating the application of a foam bead on the structural support members;
Figure 2 is a partial end view of a structural support member immediately after the application of a bead of liquid foamable resin adhesive;
Figure 3 is a partial end view of a structural support member, similar to Figure 2, after the bead has substantially fully creamed and risen;
Figure 4 is an end view of a structural support member bonded to a finish panel;
Figure S is a top p~ ,eclive view illustMting a preferred method of applying the structural support members to the finish panel;
Figure 6 is a side view of a rigid structural panel assembly formed by the method of this invention;
Figure 7 is another side view of a rigid structural panel assembly formed by the method of this invention:
60,676-051 Figure 8 is a side view of an impingement mixing chamber of a foam application gun suitable for use in the method of this invention; and Figure 9 is a side cross-sectional view of the mixing chamber shown in Figure 8.
DESCRIPTION OF THE PREFERRED
EMBODIMENTS OF THE METHOD OF THIS INVENTION
As described above, the method or process of this invention is particularly suitable for making structural panel assemblies without re~uiring mechanical fasteners. The method of this invention will form panel assemblies having a completely flat finish panel, although the structural support members are warped or irregular and the panel was initially warped or "wowed." The structural panel assemblies which may be formed by the method of this invention, include prefabricated wall, flooring and ceiling assemblies roof decking and outside walls such as used by the manufactured housing, recreational vehicle and prefabricated industrial building industries. The method of this invention may also be used to make closed wall modules having parallel panels supported by studs permanently adhesively bonded to the panels.
Figure 1 illustrates a method of forming a first panel assembly 20 as may be utilized in the method of this invention. As shown, the panel assembly 20 includes a plurality of generally parallel structural members 22a, 22b and 22c which have been secured to a first panel 24 by foam resin adhesive as described, for example, in the above-referenced U.S.
60,676-051 Patent No. 4,244,901. Such structural support members 22 are commonly referred to as studs in wall assemblies, joists in floor assemblies and trusses in ceiling assemblies. In the disclosed embodiment of the first panel assembly 20, the structural support members 22 are wood, such as the wood 2x4's commonly used for studs in wall assemblies. It will be understood, however, that the structural support members 22 may be formed of any m~teri~l used by the construction industry, including the channel-shaped metal structural support members disclosed in U.S. Patent No. 4,748,781 and the structural support members may be secured to the first panel 24 by any suitable means, including mechanical fasteners.
However, as described in the above-referenced U.S. patents, the structural members 22 may be bonded to the first panel 24 by a thin high pressure stream of polyurethane foam adhesive directed to the base of the structural members, forming a flat panel assembly.
In the method of this invention, a thin bead 28 of a thoroughly mixed two-component liquid polyurethane foamable resin adhesive is applied to the thin side faces 29 of the structural members which are to be bonded to the finish panel, as described below. As shown, the foamable resin adhesive is applied to the structural members by a foam application gun 40. The disclosed embodiment of the foam application gun includes lines or hoses 32a and 32b which receive and deliver the A-isocyanate and B-resin components of the foamable resin adhesive, to an impingement mixing chamber 34 described more fully hereinbelow, a trigger assembly 36, a pneumatic cylinder assembly 38 and a manual screw adjustment assembly 40 which adjusts the throw of the valve rod shown in Figures 8 and 9.
The disclosed embodiment of the application gun 30 is a commercially available Model D
spray gun sold by Gusmer Corp. of I ~kewood, New Jersey. Of course, other 60,676-051 two-component liquid foamable resin adhesive spray guns having a high velocity impingement mixing chamber or module can also be used. Another suitable foam application gun is the Model GX-7 gun having a high impingement module available from Gusmer Corp.
Although conventional two-component foam spray guns may be used, the gun must be modified or adjusted, as described below, to produce a relatively low forward velocity stream of thoroughly mixed polyurethane foam resin adhesive to produce a relatively thin bead of foamed resin adhesive for the method of this invention.
In the method disclosed in Figure 1, a thin foam bead 28a of liquid foamable resin adhesive is being applied to the top face 29 of structural support member 22a by foam application gun 30. The first panel assembly 20 may be supported on a horizontal surface or angled to reduce floor space. The gun is preferably moved at about the forward velocity of the liquid stream of polyurethane foamable resin adhesive exiting the application gun 30, such that there is substantially no splatter. The gun may be hand-held, as shown, or the gun may be supported on an application machine which may be computer controlled. As shown in Figure 1, the bead 28a is very thin, as applied. The liquid foamable resin adhesive bead begins to cream and rise, however, almost immediately following application, such that the bead is substantially fully creamed and expanded as shown at 28b (see Figure 3) within a few seconds after application, preferably less than 3 seconds. In a typical application where the foam bead is applied to the thin face of a 2x4 inch structural support member, a liquid bead having a width of about 1/4 inch upon application has been found to be very effective. The bead then creams and rises to about double the original height and width, or about 1/2 inch, as shown at 28b and 28c in Figure 1 and 28b in Figure 3.
60,676~51 A two-component polyurethane foamable resin adhesive was especially formulated for the method of this invention. As described, the forward velocity of the liquid foamable resin adhesive exiting from the application gun is relatively low to form a bead without splatter, preferably less than about 5 feet per second or about 1 to 3 feet per second for hand-held gun applications. The A and B components of the foamable polyurethane resin must, however, be thoroughly mixed before application. To achieve thorough mixing, an application gun having a relatively high pressure impingement mixing chamber was selected and used with relatively low viscosity liquid foamable resin components. When applied, however, the foamable resin bead should not run. To achieve this result, a thixotropic formulation was developed which begins to cream and rise almost immediately upon application, but at the same time has an extended rate of cure time.
Further, as described, the method of this invention is particularly suitable for forming wall, ceiling and flooring assemblies for prefabricated construction industries, such as the manufactured housing industry. Thus, the polyurethane foamable resin is preferably formulated for use at a relatively wide range of ambient le--lpelatul~s, preferably between about 30 and 100 degrees Fahrenheit. Humidity should not adversely affect the resultant bond. Finally, the method of this invention is also suitable for mass production of structural panel assemblies, including automated assembly processes. Thus, the foamable resin adhesive preferably sets up and cures in a controlled manner. In most applications, it is p-er~lled that the foamable resin adhesive cures in about 10 to 30 minutes, permitting completion of the assembly before the foam beads fully cure tack free. For most applications, the foamable resin adhesive should fully rise in less than 2 minutes and cure in 2114~88 60,676-051 15 to 25 minutes at the ambient tellll)eld~UlC; where the beads are applied. Of course, the foamable resin adhesive must also provide an excellent bond between the structural support members and the panel. To accomplish good bonding with the method of this invention, the foam bead must have good wetting characteristics, a relatively long tack time and good green strength. As described, the reinforced panel assembly formed by the method of this invention can be picked up and handled almost immediately following completion of the assembly.
Current polyurethane systems used by the factory-built construction industry include single component moisture cured polyurethane foams and dual component static mix systems.
With the moisture cure process, the manufacturer is limited in its use because the cure/set time varies from 0.75 hours to more than 1.5 hours. The dual component polyurethane systems presently available use a static mix process that is both costly and involves a solvent flush, such as methylene chloride. With a solvent flush, the uses are limited because of environmental problems and hazardous waste disposal requirements. The two-component polyurethane foamable resin adhesive of this invention is water blown and mixed in the application gun, elimin~ing the requirement for static mixing, solvent cleaning and the like and permitting use in the method of this invention.
60,676-051 The following formulation was developed by Applicant for the B polyol side of the resin adhesive:
ConstituentWeight Percent PG 76-120 90 - 92%
R 420 4.5 - 5.5 %
L 5420 1.4 - 1.45 %
H2O 2.5 - 2.6%
PG 76-120 is a polyether polyol available from Olin Corp. PG 76-120 has improved wetting characteristics, reduced viscosity and improves the plyability of the polyurethane foam. It also reduces friability and reduces stryration or cryst~lli7~tion. R 420 is also a polyether polyol available from Texaco Chemical Co. which provides improved reactivity. L 5420 is a silicone surfactant available from Union Carbide Chemicals & Plastics Co., Inc. The H20 is distilled water. The A-isocyanate side of the formulation is lOO percent methylene bis 4-phenyl-isocyarate available from Miles Inc. and ICI Americas, Inc.
The above formulation is suitable for applications at most ambient le...pel~tures encountered under production conditions greater than about 45~F. At lower ambient te---pel~ res or t~---pe ~ res between about 30~F and 65~F, the following formulation has been found to be particularly suitable for the B polyol side of the foamable resin adhesive:
-- 60,676-051 Constituent Wei~ht Percent PG 76-120 73 - 76%
R 42020 - 22%
L 54201.~ %
33 LV0.6%
H2O 2.2%
33 LV is an amine catalyst available from Union Carbide Chemical & Plastics Co. As will be understood by those skilled in the art, adjusting the polyether polyol ratio and adding an amine catalyst makes the foam formulation "hotter", providing a good foam bead at colder ambient temperatures. The A iso side of the formulation may be the same as the formulation described above.
The green sheer strength of the described foam resin adhesive utilized in the method of this invention is as follows:
TimeSheer Strength 10 min. 117.00 psi 11 min. 121.30 psi 13 min. 136.80 psi 17 min. 199.00 psi 20 min. 254.80 psi 24 hours604.30 psi Thus, the reinforced panel assembly formed by the method of this invention can be picked up and handled by conventional material handling techniques within a few minutes after bonding.
60,676-051 After the foam bead 28 is applied, as shown in Figure 1 at 28a, the bead is allowed to substantially fully cream and rise, forming an enlarged foam bead on the surface 29 of the structural support members which are to be bonded to the finish panel 50. As shown in Figure 4, the finish panel 50 may be applied on top of the bead and pressed. More preferably, the first panel assembly 20 may be turned as shown in Figure 5 and the support members applied to the finish panel supported on a flat surface, such as a vacuum table 52.
In either method, the volume of the bead 28b should be sufficient to completely bridge the mating surfaces of the finish panel 50 and the structural support members 22 as shown in Figure 4. Where a flat finish panel is desired, the panel is first laid on a flat support surface, such as the vacuum table 52 shown in Figure 5. A vacuum table having a plurality of holes 54 may be desired where the panel is relatively flexible, but is warped or includes "wows". Vacuum tables are commonly used to maintain a flexible sheet, board or panel flat while it is being worked upon.
As stated above, Figure 5 illustrates a prere~led embodiment of the method of this invention. As shown, the first panel assembly 20 is turned or rotated, such that the beads 28 overlie the finish panel 50, which is supported on the vacuum table 52, as described above.
The first panel assembly 20 is then pressed against the finish panel, compressing the beads 28 against the finish panel. The polyurethane foam then wets the finish panel, forming a bridge between the finish panel 50 and the structural support members 22, as shown in Figure 4.
Thus, it is necessary to complete this step before the polyurethane foam beads fully cure tack free. Further, the polyurethane foam beads must be sufficiently flexible to bridge the interface between the structural members and the finish panel. The completed structural 60,676-051 panel assembly may be lifted and handled almost immediately upon pressing of the structural members 22 against the finish panel. That is, the bonding is almost instantaneous, which is an impo~ t advantage of the method of this invention.
Figures 6 and 7 illustrate structural panel assemblies formed by the method of this invention. As described above, the finish panel 50 is preferably first laid upon a flat surface 51. In the disclosed embodiment, the flat surface is provided by a vacuum table 52 having a plurality of spaced holes 54. A vacuum is drawn on the underside of the table 52 which dMws the panel 50 against the flat surface 51, ironing out any warpage or "wow" in the flexible panel 50. Figure 6 illustrates a common situation where the structural support members 22 are of different widths. As stated above, the structural support members 22 are commonly 2x4's or 4x6's as used for studs in wall panel assemblies, joists in flooring assemblies and trusses in ceiling assemblies. The dimensions of such lumber, however, vary significantly. The long side may vary as much as 1/2 inch. As shown, however, the foam bead 28 fills in the additional space required by the thinner structural members, such that the finish panel 50 remains completely flat. Figure 7 illustrates the situation where the structural member 22 is warped or bowed. As shown the foam bead 28 will ~imil~rly fill the concave areas, such that the finish panel 50 remains flat. As described, the finish panel is retained flat on the vacuum table 52 when the first panel assembly is turned and applied to the finish panel, as shown in Figure 5.
Figures 8 and 9 illustrate a mixing chamber 60 of the foam application gun 30 of Figure 1. The mixing chamber 60 includes a cylindrical body 62 having an axially bore 64 21 14888 ~
which defines the mixing chamber. The end 66 is externally threaded to receive a nozzle (not shown) and the opposite end is counterbored at 68 to receive a ferrule 72 and internally threaded to receive a p~cking or lock nut 70. A valve rod 76 is reciprocated in the axial bore 64 by the pneumatic cylinder assembly 38 of Figure 1 as described below.
When the value rod is retracted, the A and B components of the foam resin adhesive enter the mixing chamber 64 ~ PJy through very small slots 82 on opposite sides of the valve body 62. Hardened inserts 80 may be provided to reduce wear. The slots have a width of about V2 the ~ meter of the bore mix chamber 64, such that the high impingement force of the foamable resin col--ponent~ entering the chamber is dissipated sufficiently to generate a low velocity bead, as described above. In an actual embodiment, the width of the slot 82 was 0.046 inches and the diameter of the bore mixing chamber 64 was 0.078 inches.
The viscosity of the A iso side was 250 cps and the B polyol side was 560 cps. The inlet **
pressure was 400 psi. The A and B co---ponents were thoroughly mixed in the high impingement mixing chamber and exited the bore at about 3 feet per second, forming a relatively thin bead of foamed resin adhesive without splatter, as described above.
* cps = centipoise * * psi = pounds per square inch The foam application gun 30 shown in Figure 1 is operated by actuating the trigger mechanism 36, which operates the pneum~tic cylinder to retrack the valve rod 76 beyond the slot 82, permitting the A iso and B polyol co~-,pollents of the foamable resin to enter the mixing chamber 64 under high impingement pressure, where the components are thoroughly mixed. The foamable resin adhesive then exits the outlet 86 of the mixing chamber, where it is applied in the form of a thin liquid bead 28a as shown in Figures 1 and 2. Almost Bi-~J
60,676451 immediately, the liquid bead creams and rises, forming the foam beads 28b and 28c as shown in Figures 1 and 3. The application gun 30 may be hand-held or the gun may be supported on a movable fixture and co,-,L,uler-controlled, for example. Where the gun is computer-controlled, it may be pl~relled to apply the foam beads first to the finish panel 50.
The structural support members may be secured to a first panel 24 as shown in Figure 1, or the structural support members 22 may be oriented and supported in a jig or fixture, elimin~ting the re~uirement for a first panel in a floor assembly, for example.
The foam 28 preferably substantially fully bridges the interface between the structural support members 22 and the finish panel 50 as shown in Figure 4, such that the finish panel 50 does not contact the structural support members 22. The cellular foam adhesive provides a resilient joint between the structural support members and the finish panel and a thermal break. These advantages are provided even where the foam bead is inlellupted at predetermined locations to reduce cost.
As will be understood by those skilled in the art, various modifications may be made to the method of forming structural panel assemblies of this invention and the resultant improved rigid structural panel assembly within the purview of the appended claims. For example, the structural support members 22 may be attached to the first panel 24 by any suitable means, including mechanical fasteners, although the use of foam adhesives had several advantages over the prior art, as described above. Further, although an important advantage of the method of this invention is the elimin~tion of mechanical fasteners, mechanical fasteners may also be used between the finish panel and the structural support B-60,676-051 members. Finally, although the foam resin bead is preferably applied to the structural members, as described above, the bead may alternatively be applied first to the finish panel.
Claims (9)
1. A method of forming a rigid structural panel assembly comprising a flexible fibrous panel and a plurality of transverse thin generally parallel support fibrous members each having a generally planar edge face adhesively bonded to said panel and extending from said panel generally perpendicular to said panel, said method comprising:
applying a thin generally continuous bead of liquid foamable polymeric adhesive to said planar edge faces of each of said thin support members, said beads of liquid foamable polymeric adhesive having a width less than the width of said planar edge faces of said support members and said polymeric adhesive having a cure time of greater than ten minutes;
allowing said liquid foamable polymeric adhesive to foam and rise but not cure;
then compressing said planar edge faces of said support members against said panel prior to curing of said polymeric adhesive, thereby compressing and spreading said beads of liquid foamed polymeric adhesive to generally cover and wet the opposed surfaces of said planar edge faces of said support members and the opposed surfaces of said panel; and then curing said polymeric adhesive, thereby permanently bonding said support members to said panel and forming a rigid structural panel assembly.
applying a thin generally continuous bead of liquid foamable polymeric adhesive to said planar edge faces of each of said thin support members, said beads of liquid foamable polymeric adhesive having a width less than the width of said planar edge faces of said support members and said polymeric adhesive having a cure time of greater than ten minutes;
allowing said liquid foamable polymeric adhesive to foam and rise but not cure;
then compressing said planar edge faces of said support members against said panel prior to curing of said polymeric adhesive, thereby compressing and spreading said beads of liquid foamed polymeric adhesive to generally cover and wet the opposed surfaces of said planar edge faces of said support members and the opposed surfaces of said panel; and then curing said polymeric adhesive, thereby permanently bonding said support members to said panel and forming a rigid structural panel assembly.
2. The method of forming a rigid structural panel assembly as defined in Claim 1, wherein said generally parallel support members each include a second generally planar edge face opposite said previously defined edge face, said method including first attaching said second edge faces of said support members to a second panel in generally perpendicular relation, then applying said thin bead of liquid foamable polymeric adhesive to exposed edge faces of said support members and adhesively bonding said support members to said panel as defined in Claim 1, thereby forming a rigid enclosed wall structure comprising opposed panels and generally perpendicular support members attached therebetween.
3. The method of forming a rigid structural panel assembly as defined in Claim 2, wherein said method includes laying said second panel on a generally horizontal support surface with said support members extending upwardly following attachment of said support members to said second panel, then applying said thin generally continuous bead of liquid foamable polymeric adhesive to said edge faces of each of said support members and bonding said support members to said flexible fibrous panel as defined in Claim 1.
4. The method of forming a rigid structural panel assembly as defined in Claim 1, wherein said method includes applying to said planar edge faces of each of said support members a liquid thoroughly mixed plural component thixotropic foamable polymeric adhesive having a rise time of less than two minutes and a cure time of about ten to thirty minutes at a temperature between about 30°F and 100°F.
5. The method of forming a rigid structural panel assembly as defined in Claim 1, wherein said method includes applying to said edge faces of each of said support members a thin generally continuous bead of a thoroughly mixed liquid thixotropic plural component polyurethane adhesive having a rise time of less than two minutes and a cure time of greater than ten minutes at a temperature between about 30°F and 100°F.
6. The method of forming a rigid structural panel assembly as defined in Claim 1, wherein the width of said planar edge faces of said support members is about four inches and said method includes applying a generally continuous bead of a liquid foamable polymeric adhesive to said planar edge faces having an initial width of about one quarter inch, then allowing said liquid foamable polymeric adhesive to foam and rise to about double the initial width, then compressing said planar edge faces of said support members against said panel, thereby compressing and spreading said beads of foamed polymeric adhesive to generally completely cover and wet the opposed surfaces of said planar faces of said support members and said panel.
7. The method of forming a rigid structural panel assembly as defined in Claim 1, wherein said panel assembly includes a plurality of co-planar flexible fibrous panels in edge abutting relation comprising at least two panels having generally straight abutting edges, said method including supporting said panel in edge abutting relation, applying said bead of liquid foamable resin adhesive to said planar edge faces of said support members, then compressing said planar edge faces of said support members against said panels with one edge face bridging said abutting edges of said panels, thereby permanently attaching said panels to said support members in edge abutting relation.
8. A method of forming a rigid structural panel assembly comprising a flat flexible fibrous panel and a plurality of transverse thin generally parallel support fibrous members each having a generally planar edge face adhesively bonded to said panel, said method comprising:
orienting said flexible fibrous panel on a vacuum plate having a plurality of apertures therethrough, drawing a vacuum through said vacuum plate and drawing said flexible fibrous panel flat against said plate, thereby reducing any non- planar portions of said panel;
applying a thin generally continuous bead of liquid foamable polymeric adhesive to said planar edge faces of each of said support members or the matting surface of said panel, said beads having a width less than the width of said planar face of said support members;
allowing said liquid foamable polymeric adhesive to foam and rise;
then compressing said planar edge faces of said support members against said panel prior to curing of said adhesive, thereby compressing and spreading said beads of liquid foamable polymeric adhesive to generally cover and wet the opposed surfaces of said planar faces of said support members and said panels; and then curing said polymeric adhesive while said vacuum is maintained on said panel, thereby permanently bonding said support members to said panel and forming a rigid structural panel assembly having a flat fibrous panel.
orienting said flexible fibrous panel on a vacuum plate having a plurality of apertures therethrough, drawing a vacuum through said vacuum plate and drawing said flexible fibrous panel flat against said plate, thereby reducing any non- planar portions of said panel;
applying a thin generally continuous bead of liquid foamable polymeric adhesive to said planar edge faces of each of said support members or the matting surface of said panel, said beads having a width less than the width of said planar face of said support members;
allowing said liquid foamable polymeric adhesive to foam and rise;
then compressing said planar edge faces of said support members against said panel prior to curing of said adhesive, thereby compressing and spreading said beads of liquid foamable polymeric adhesive to generally cover and wet the opposed surfaces of said planar faces of said support members and said panels; and then curing said polymeric adhesive while said vacuum is maintained on said panel, thereby permanently bonding said support members to said panel and forming a rigid structural panel assembly having a flat fibrous panel.
9. The method of forming a rigid structural panel assembly as defined in Claim 8, wherein said structural panel assembly includes at least two co-planar flexible fibrous panels, said method including supporting said panels on said vacuum plate in edge abutting relation, said panels each having a generally straight edge in abutting edge to edge relation, drawing a vacuum through said vacuum plate and drawing said flexible fibrous panels flat against said plate, thereby reducing any non-planar portions of said panels;
applying said bead of liquid foamable resin to said planar faces of said support members, then compressing said support members against said panel with at least one planar face of said stud members bridging said abutting edges of said panels, then curing said polymeric adhesive while maintaining said vacuum, thereby permanently bonding said support members to said panels and said panels to support members in co-planar relation.
applying said bead of liquid foamable resin to said planar faces of said support members, then compressing said support members against said panel with at least one planar face of said stud members bridging said abutting edges of said panels, then curing said polymeric adhesive while maintaining said vacuum, thereby permanently bonding said support members to said panels and said panels to support members in co-planar relation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/014,440 US5425908A (en) | 1993-02-05 | 1993-02-05 | Method of forming structural panel assemblies |
| US08/014,440 | 1993-02-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2114888A1 CA2114888A1 (en) | 1994-08-06 |
| CA2114888C true CA2114888C (en) | 1998-04-07 |
Family
ID=21765494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002114888A Expired - Fee Related CA2114888C (en) | 1993-02-05 | 1994-02-03 | Method of forming structural panel assemblies |
Country Status (3)
| Country | Link |
|---|---|
| US (5) | US5425908A (en) |
| CA (1) | CA2114888C (en) |
| MX (1) | MX9400939A (en) |
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| US20140021685A1 (en) * | 2012-07-23 | 2014-01-23 | Matthew J. Fenik | Building Sealing Systems and Methods of Installing the Same |
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| US10865562B2 (en) * | 2014-06-28 | 2020-12-15 | Kenneth R. Kreizinger | Foam backed panel with cantilever |
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| US10301823B2 (en) * | 2014-06-28 | 2019-05-28 | Kenneth Robert Kreizinger | Frame supported panel |
| US10563398B1 (en) * | 2019-04-10 | 2020-02-18 | Kenneth R. Kreizinger | Method of stiffening a frame supported panel |
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-
1993
- 1993-02-05 US US08/014,440 patent/US5425908A/en not_active Expired - Lifetime
- 1993-07-09 US US08/089,726 patent/US5552095A/en not_active Expired - Lifetime
-
1994
- 1994-02-03 CA CA002114888A patent/CA2114888C/en not_active Expired - Fee Related
- 1994-02-04 MX MX9400939A patent/MX9400939A/en not_active IP Right Cessation
-
1995
- 1995-03-21 US US08/407,695 patent/US5714099A/en not_active Expired - Fee Related
- 1995-05-26 US US08/451,760 patent/US5635118A/en not_active Expired - Lifetime
-
1997
- 1997-04-18 US US08/844,272 patent/US5861119A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US5635118A (en) | 1997-06-03 |
| US5861119A (en) | 1999-01-19 |
| US5714099A (en) | 1998-02-03 |
| CA2114888A1 (en) | 1994-08-06 |
| MX9400939A (en) | 1994-08-31 |
| US5425908A (en) | 1995-06-20 |
| US5552095A (en) | 1996-09-03 |
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| EEER | Examination request | ||
| MKLA | Lapsed |