CA2427241A1

CA2427241A1 - Resilient flooring structure with encapsulated fabric

Info

Publication number: CA2427241A1
Application number: CA 2427241
Authority: CA
Inventors: Steven F. Hynicka; Donald E. Barshinger; Donald E. Schneider
Original assignee: Armstrong World Industries Inc
Current assignee: Armstrong World Industries Inc
Priority date: 2002-05-14
Filing date: 2003-04-29
Publication date: 2003-11-14
Also published as: US20030215618A1; DE60306983D1; US20050090167A1; US6818282B2; ATE333987T1; DE60306983T2; EP1362695B1; EP1362695A1

Abstract

A laminated fabric floor product having an encapsulated fabric scrim within a vinyl resilient flooring structure. The laminated fabric floor product structure includes a PVC
calendered base, a first hot melt film, a fabric, a second hot melt film, a calendered clear film, and a high performance coating. Traditional foamed and non-foamed substrates used in the flooring industry can be used in addition to the calendered base. All types of fabrics and scrims can be encapsulated. The fabrics can be both woven and non-woven types. Open scrims can be used with base layers that are printed or have a visual pattern so that design features and colors can be seen through the open areas of the scrim. The fabric layer can be printed with a design pattern and adhered to the base layer or substrate by the first hot melt adhesive film layer. The clear layer is adhered to the fabric layer by the second hot melt adhesive layer.

Description

Attorney Docket No. A 148 1790.1 RESILIENT FLOORING STRUCTURh:
WITH ENCAI'SUI.ATEP FABRIC
Baclyround of tt~e-Invention [0001 ~ The present invention relates to resilient surface coverings and more particularly to resilient composite floor coverings having an encapsulated fabric or scrim to provide an enhanced aesthetic: appearance.

[0002] Decorative floor coverings such as carpets and vinyl for both commercial and home use are well known in the art. Carpet coverings generally provide a different aesthetic appearance than vinyl, but lack the strength, impact resistance and durability of vinyl.
A resilient floor covering signifies the ability of the floor covering to recover from deformations, such as indentations created by furniture legs, shoe heels, dropped objects and the like. The ability to recover distinguishes resilient floor coverings from other types of floor coverings such as carpeting, wood, ceramic and stone. Therefore, it is desirable to provide a resilient composite floor covering that combines the advantages of vinyl with the aesthetic appearance provided by a fabric or scrim having a printed design.
.Attorney Docket No. A148 1790.1 1 Surromary of the Invention [0003) In one embodiment, the laminated fabric floor product of the present invention has a structure that contains an encapsulated fabric- or scrim within a vinyl resilient flooring struchire.
The laminated fabric floor product structure includes a PVC: calenclered base, a first hot melt film, fabric, a second hot melt film, a calendered clear film, and a high performance coatis~;.

[0004] Other substrates besides the calendered base can be used. These can include traditional foamed and non-foamed substrates utilized in the flooring industry. All types of fabrics and scrims can be utilized. Tight fabrics that are printed with a design can be used. The fabrics can be woven and non-woven types. Additionally, scrims that are more open can also be employed.
The open scrims can be used with base layers that are printed or have a visual pattern so that design features. color, etc. can be seen through the open areas of the scrim.
Additionally, such open scrims can also be printed so that the scrim contains a pattern and/or color that complements the pattern or color of the base layer.

[0005) In another embodiment, the base, hot melt films, and calendered clear film would all be f Ims introduced along with the desired fabric at the press nip. The fabric material can be anything available today. The heaviest gauge material that has been incorporated into the structure thus far is upholstery material. A high performance coating is applied later in the manufacturing process. One manufacturing process option for this embodiment is a lamination process that laminates the fabric or scrim layer using an auma. Other process options exist for incorporating/encapsulating these type scrims into flooring.
Attorney Docket No. A148 1790.1 2 [0006:) In another embodiment, a desired pattern is printed on a scrim structure. A filled calendered base layer is prepared, aroi a plastisol is applied by rotary screen. The scrim (e.g., woven ar nonwoven glass mat) is introduced into the plastisol and the plastisol gelled. The desired pattern is then printed by rotogravure onto the surface of the scrim.
Another Layer of plastisol is applied, and the composite is oven-fused. A hot melt calendered clear layer is then applied. Finally, a high performance coating is applied using well-known soft roll or air knife coating processes.
[0007] In yet another embodiment, a desired pattern is printed under the scrim. A calendered base is again prepared. The desired pattern is printed on the calendered base by rotogravure. A
plastisoi is then applied by rotary screen. T he scrim is pushed into the wet plastisol. The composite is then oven-fused. A hot melt calendered clear layer is then applied. The high performance caating is applied to complete the process.
Descr- iption of the Drawin s [0008) Fig. 1 illustrates a print on scrim resilient flooring structure in accordance with an exemplary embodiment of the present invention.
[0009] Fig. 2 illustrates a print under scrim resilient flooring stnzcture in accordance with an exemplary embodiment of the present invention.
[001 U] Fig. 3 illustrates a laminated fabric flooring structure in accordance with an exemplary embodiment of the present invention.
Attorney Docket No. A148 1790.1 3 Detailed Description ot-the Invention [0011 ] The present invention is directed to resilient floor coverings that encapsulate a fabric or scrim within the flooring structure, and processes for manufacturing the flooring structure. The invention is described in the context of exemplary embodiments, but the embodiments disclosed are not intended as limitations of the invention. The materials and process steps used to form the flooring structures are well known in the art. however, those skilled in the art have not-used the combination of materials and process steps in fhe order of the present invention to enhmce the aesthetic appearance of Mooring structures as described herein.
[0012] Figs. 1-3 show different embodiments of the present invention that include either an encapsulated scrim or fabric Layer to enhance the aesthetic appeal of resilient flooring. All types of fabric and scrims can be used, including woven, braided, knitted, and non-woven types. In the present context, a fabric or scrim is a generally planar textile structure of yarns, filaments and fibers having a facing and a lower surface. The "open" character of the fabric and scrims can be achieved through normal manufacturing methods, or through post punching or removal of segments/sections of the finished fabric. The facing of the fabric can be plain or carry a decorative design. Colors and design patterns can be applied to the fabrics by conventional techniques such as dyeing the yams, filaments, or fibers or by dyeing or printing the fabric itself.
Printing involves applying a coloring agent to the fabric and treating the fabric with heat or chemicals to fix the coloring agent. 'The fabric can be decorated via gravure printing, screen printing, spray printing or by other conventional means. The only limitation on the Attorney Docket No. A148 1790.1 4 design/decoration is that it be stable during the manufacturing process and during the lifetime of the t7ooring product.
[0013] Fabrics can be natural or synthetic fibers, including wool, cotton, polyamides, polyesters, polyolefins, acrylica, rayon, silk, etc. In addition, fabrics can be textured or non-textured. The fabrics can be either woven or non-woven. Woven fabrics refer to fabrics formed by weaving two sets of yams. Non-woven fabrics refer to an assembly of textile fibers held together by interlocking the fibers in a mat, by fusing of the fibers, or by bonding the fibers with an adhesive.
Depending upon the nature of the fabric fibers, and the polymeric composition of the substrate and wear layer, it is possible that excellent adhesion can be achieved between the fabric and the adjacent layers. However, if adhesion neds to be improved, the fabric can be treated with surface treatments to improve adhesion (for example silane coupling agents for glass fabrics), or adhesive layers such as hot melt adhesives can be employed.
[0014] One substrate utilized in the struct~.Ires of the present invention is a polyvinyl chloride (PVC) calendered base layer. Any traditional foamed or non-foamed substrates used in the flooring industry also can be used as the base layer. Some examples of substrates are solid, filled or unfilled polymeric layers or composites, solid layer composites including fibrous webs saturated with polymeric binder, and one or more porous fibrous layers. Melt-processed base layers formed of resins composed of PVC homopolymers provide strength and durability to the floor covering. Patent application Serial No. 09!853,291, filed May 5, 2001 and having the same assignee as the present invention, discloses enhanced resilient floor coverings that can be used with the present invention. The entire disclosure of this patent application is incorporated by Attorney Docket No. A148 1790.1 S

reference lnerein_ An adhesive layer can 'be applied to the substrate to provide adequate adhesion of the fabric or scrim layer.
[0015] ,A clear layer is located above the fabric and can be any composition as Long as it is compatible with the rest of the flooring stmcture. The clear layer can be continuous or discontinuous. The clear layer may also function as the wear layer, or a component of the wear layer in the flooring product. For example a hot melt calendered clear layer or wear layer is applied above the fabric or scrim layer. Patent Application serial number 09/200,813, filed Navember 27, 1998 and having the same assignee as the present invention, discloses hot melt calendered polymer resin wear layers for embossed or textured substrates, and a process for hot melt calenderit~g. As described in the pending patent application, the melt processable layer can be formed and applied by melt calendar equipment in widths that are limited only by equipment and substrate availability. A melt processable polymer resin can be delivered as a melt-processable extmdate to a three roll calendar, where the polymer resin composition is further softened by the heated rolls. The hot melt composition can also be introduced as a film. rfhe film is subsequently melted or softened and applied to the substrate with a calendar or heated drum and conformable pressure roll. The entire disclosure of this patent application is incorporated by reference herein. If necessary, an adhesive layer is applied to the fabric or scrim layer to provide adequate adhesion of the clear, wear layer. A high performance coating is applied after the composite structure is formed. The high performance coating can be urethane, polyester or L1V
curable.
Attorney Docket No. A148 1790. I 6 [0016] l~ig. 1 shows a print on se;rim resilient tlooring structure '10. The print on scrim stricture includes a base layer 24 having a thickness of about 40 mils, a first plastisol layer 22 having a thickness of about 10 mils, a scrim 20 having a thickness of about 10 mils, a second plastisol layer 16 (optional) having a thickness of about 5 mils, a hot melt calendered clear layer 14 having a thickness of about 1 S mils and a high performance coating 12.
[0017] The print on scrim structure is formed by performing the following steps. A filled calendered base layer 24 is first prepared. <A plastisol 22 is then applied by rotary screen to the calendered base layer 24. The plastisol thickness depends on the scrim gauge.
The scrim 20 is next introduced into the plastisol 22 using the nip of a rotary drum. The scrim 20 can include a woven glass mat or a non-woven mat. The gap between the drum and rubber roll is adjusted to prevent or minimize saturation of the plastisol to the scrim surface. 'fhe composite stn~cture is then gelled around the heated dmm using a process that is further described in patent application serial no. 09/853,291 referenced above. A desired pattern 18 is printed by rotogravure on the protruding surface of~scrim 20. A second plastisol 16 is then applied by rotary screen to the scrim 20. The plastisol coating, which can be applied by roll or blade, helps tie in the glass Fbers of a woven glass mat scrim and acts as a key coat for bonding of the hot melt calendered clear Iayer 14 to the glass mat scrim 20. This composite structure is then oven fused. The calendered clear layer 14 is then applied to the composite structure using the process described in above-referenced patent application serial no. 0t)/200,813. Finally, the high performance coating 12 is applied using well known soft roll or air knife type coating processes.
Attorney Docket No. A148 1?90.I 7 [0018) The desired visual pattern 18 can be printed only on the surface of the scrim 20. If the scrim 20 is an open or weave; type, the printed visual 18 is localized only on the scrim thereby producing a discozztinuous pattern that follows the detail of the scrim's construction. It is also possible to embed the scrim into the vinyl base layer 24 to produce a smooth surface that can be printed. In this instance, the print imabe is not confined to the scrim surface.
[0019) Fig. 2 shows a print under scrim r~.silient flooring structure 30. '(he print under scrim structure 30 includes a base layer 40 having a thickness of about 45-55 mils, a scrim 36 and plastisoI coating having a combined thickness of about 5-15 mils, a hot melt calendere;d clear layer 34 having a thickness of about 1 S mils and a high performance coating 32.
X0020) The print zznder scrim structure is fanned by performing the (allowing steps. A filled calendered base layer 40 is first prepared. ,A desired pattern 38 is printed by rotogravure on the calendered base layer 40. A plastisol is then applied by rotary screen with the thickness of the plastisol application depending on the scrim used. The plastisol coating should be greater than the scrim gauge. The scrim 36 is then laid onto the wet plastisol. The scrim 36 must be constructed so that the print pattern 38 can show through and be seen. A
whisper blade may be required to push the scrim 36 into the wet coating to the extent that the plastisol coats the scrim surface. This is necessary for adhesion purposes. This composite structure is then oven-fused.
The calendered clear layer 34 is then applied to the composite structure using the process described in above-referenced patent application serial no. 09/200,813.
Finally, the high performance coating 32 is applied using well known soft roll or air knife type coating processes.
Attorney Docket No. A148 1790.1 8 [0021 ] Fig. ~ shows a laminated fabric flooring structure 50. The laminated fabric flooring structure 50 includes a base layer 62 having a thickness of abort 4() mils, a hot melt adhesive layer 60, a fabric layer 58, a second adhesive hot melt layer 56, a hot melt calendered layer 54 having a thickness of about 20 mils, and a high perfornaance coating ~2. The base Iayer f>2, hot melt films 56, 60 and calendered clear layer ~4 can all be films introduced along with the desired fabric 58 at the press nip on an Auma line.
[0022] The corresponding structures, materials, acts, and equivalents of all means plus fiznction elements in any claims below are intemled to include any structure, material or acts for performing the functions in combination with other claim elements as specifically claimed.
~tJ02J~ Those skilled in the art will appre:.iate that many modifications to the exemplary embodiment of the present invention are possible without departing from the spirit and scope of the present invention. Some of those possible modifications have been discussed herein. In addition, it is possible to use some of the features of the present invention without the corresponding use of the other features. Accordingly, the foregoing description of the exemplary embodiment is provided for the purpose of' illustrating the principles of the present invention and not in imitation thereof since the scope of the present invention is defined solely by the appended claims.
Attorney Docket No. A148 1790.1 9

Claims

1. A resilient flooring structure comprising:

a substrate;

a fabric layer printed with a design pattern and adhered to the substrate; and a clear layer adhered to the fabric layer opposite the substrate, wherein the design pattern can be seen through the clear layer.

2. The resilient flooring structure of claim 1 wherein the clear layer is discontinuous.

3. The resilient flooring structure of claim 1 wherein the clear layer is a wear layer.

4. The resilient flooring structure of claim 3 further comprising a high performance top coat layer adhered to the clear wear layer opposite the fabric layer.

5. The resilient flooring structure of claim 1 wherein the substrate comprises a polyvinyl chloride calendered base layer.

6. The resilient flooring structure of claim 5 wherein the calendered base layer is about 20 mils to about 60 mils in thickness.

7. The resilient flooring structure of claim 1 wherein the substrate comprises a foam layer.

8. The resilient flooring structure of claim 1 wherein the fabric layer is a woven material.

9. The resilient flooring structure of claim 1 further comprising an adhesive layer between the substrate and the fabric layer, and/or an adhesive layer between the printed fabric and the clear layer.

10. The resilient flooring structure of claim 1 wherein the clear layer comprises a calendered clear film.

11. The resilient flooring structure of claim 1 wherein the clear layer comprises a polyvinyl chloride polymer.

12. The resilient flooring structure of claim 1 wherein the calendered clear film has a thickness from about 10 mils to about 20 mils.

13. A resilient flooring structure comprising:

a substrate;

a scrim layer adhered to the substrate; and a clear layer adhered to the scrim layer opposite the substrate, wherein the scrim layer and substrate can be seen through the clear layer.

14. The resilient flooring structure of claim 13 wherein the clear layer is discontinuous.

15. The resilient flooring structure of claim 13 wherein the clear layer is a wear layer.

16. The resilient flooring structure of claim 13 wherein the scrim layer is a non-woven material.

17. The resilient flooring structure of claim 13 wherein the scrim layer is colored or comprises a patten or solid color printed on the upper surface of the scrim.

18. The resilient flooring structure of claim 13 wherein the scrim layer has a thickness from about 5 mils to about 20 mils.

19. The resilient flooring structure of claim 13 wherein the substrate comprises a visible pattern or printed design.

20. The resilient flooring structure of claim 13 further comprising a high performance top coat layer adhered to the clear layer opposite the scrim.

21. The resilient flooring structure of claim 13 wherein the substrate comprises a polyvinyl chloride calendered base layer.

22. The resilient flooring structure of claim 13 wherein the substrate has a thickness from about 20 mils to about 60 mils.

23. The resilient flooring structure of claim 13 wherein the substrate comprises a foam layer.

24. The resilient flooring structure of claim 13 wherein the clear layer comprises a calendered clear film.

25. The resilient flooring structure of claim 24 wherein the calendered clear film has a thickness from about 10 mils to about 20 mils.

26. A method for making a resilient floor structure having a printed visual appearance comprising the steps of:

placing a fabric layer in contact with a flooring substrate;
applying a clear layer to the fabric layer;
heating to fuse and create a fully bonded composite flooring structure.

27. The method of claim 26 wherein the flooring substrate comprises a fluid layer on a surface onto which the fabric layer is placed.

28. The method of claim 27 wherein the fluid layer comprises a PVC plastisol or hot melt type material.

29. The method of claim 28 wherein the PVC plastisol material is heated to solidify and adhere the fabric to the substrate before applying the clear layer.

30. The method of claim 28 wherein the hot melt material is allowed to solidify upon cooling before applying the clear layer.

31. The method of claim 26 wherein the fabric layer is pre-printed with a design pattern before being placed in contact with the substrate.

32. The method of claim 26 wherein the fabric layer is printed while in contact with the substrate.

33. The method of claim 26 further comprising the step of applying a high performance top coat layer to the clear layer.

34. The method of claim 31 further comprising applying a discontinuous opaque layer onto the printed fabric before applying the clear layer.

35. The method of claim 32 further comprising applying a discontinuous opaque layer onto the printed fabric before applying the clear layer.

36. The method of claim 26 wherein the clear layer comprises a clear film.

37. The method of claim 36 wherein the composite structure is fused using heat and pressure.

38. The method of claim 36 wherein an Auma is used to fuse the composite structure.

39. A method for making a resilient floor structure having a printed visual appearance comprising the steps of:
placing a scrim layer in contact with a flooring substrate;
applying a clear layer to the scrim layer;
heating to fuse and create a fully bonded composite flooring structure.

40. The method of claim 39 wherein the flooring substrate comprises a visible design pattern layer.

41. The method of claim 39 wherein the flooring substrate comprises a fluid layer on a surface onto which the scrim layer is placed.

42. The method of claim 41 wherein the scrim surface protrudes above the surface of the fluid layer.

43. The method of claim 41 wherein the fluid layer comprises a PVC plastisol or hot melt type material.

44. The method of claim 42 wherein the PVC plastisol material is heated to solidify and adhere the scrim to the substrate before applying the clear layer.

45. The method of claim 43 wherein the hot melt material is allowed to solidify upon cooling before applying the clear layer.

46. The method of claim 39 wherein the scrim layer is pre-printed with a design pattern before being placed in contact with the substrate.

47. The method of claim 39 wherein the scrim layer is printed while in contact with the substrate.

48. The method of claim 42 wherein the surface of the protruding scrim layer is printed while in contact with the substrate.

49. The method of claim 39 wherein the scrim layer is a non-woven material.

50. A method for making a resilient floor structure having a printed visual appearance comprising the steps of:
applying a plastisol coating onto a substrate;
placing a scrim layer into the plastisol coating so that the scrim surface protrudes above the plastisol and gelling the plastisol coating;
applying a clear wear layer to the scrim layer to form a composite structure;
and fusing the composite structure by heating in an oven.

51. The method for making a resilient floor structure having a printed visual appearance of claim 50 wherein the substrate comprises a pattern or printed design.

52. The method for making a resilient floor structure having a printed visual appearance of claim 51 further comprising the step of applying a high performance top coat layer to the clear layer opposite the scrim layer.

53. The method for making a resilient floor structure having a printed visual appearance of claim 58 wherein the scrim is pre-printed before being placed into the plastisol coating.

54. The method for making a resilient floor structure having a printed visual appearance of claim 50 wherein the application of the wear layer does not occur until after the composite structure is fused.

55. The method for making a resilient floor structure having a printed visual appearance of claim 50 wherein the substrate comprises a calendered layer.

56. The method for making a resilient floor structure having a printed visual appearance of claim 50 wherein the scrim layer is a non-woven material.

57. The method for making a resilient floor structure having a printed visual appearance of claim 50 further comprising printing a desired pattern on the substrate.

58. The method for making a resilient floor structure having a printed visual appearance of claim 57 further comprising the step of applying a clear layer to the upper surface of the fused composite structure.

59. The method for making a resilient floor structure having a printed visual appearance of claim 58 further comprising the step of applying a high performance coating layer to the clear layer.

60. The method for making a resilient floor structure having a printed visual appearance of claim 50 further comprising pushing the scrim into the wet plastisol coating so that the plastisol coating covers the surface of the scrim.

61. A method for making a resilient floor structure having a printed visual appearance comprising the steps of:
preparing a substrate;
applying a first hot melt adhesive to the substrate;
adding a fabric layer to the first hot melt adhesive;
applying a second hot melt adhesive to the fabric layer; and applying a clear layer to the second hot melt adhesive to form a composite structure.

62. The method for making a resilient floor structure having a printed visual appearance of claim 61 further comprising the step of applying a high performance coating layer to the clear layer.

63. The method for making a resilient floor structure having a printed visual appearance of claim 61 wherein the fabric layer is preprinted with a design pattern.