CA1162368A - Method for forming a compartmented puncture sealant package by coextrusion - Google Patents
Method for forming a compartmented puncture sealant package by coextrusionInfo
- Publication number
- CA1162368A CA1162368A CA000409149A CA409149A CA1162368A CA 1162368 A CA1162368 A CA 1162368A CA 000409149 A CA000409149 A CA 000409149A CA 409149 A CA409149 A CA 409149A CA 1162368 A CA1162368 A CA 1162368A
- Authority
- CA
- Canada
- Prior art keywords
- package
- sealant
- forming
- stream
- puncture sealant
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C19/00—Tyre parts or constructions not otherwise provided for
- B60C19/12—Puncture preventing arrangements
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/304—Extrusion nozzles or dies specially adapted for bringing together components, e.g. melts within the die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
- B29D30/0685—Incorporating auto-repairing or self-sealing arrangements or agents on or into tyres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0681—Parts of pneumatic tyres; accessories, auxiliary operations
- B29D30/0685—Incorporating auto-repairing or self-sealing arrangements or agents on or into tyres
- B29D2030/0686—Incorporating sealants on or into tyres not otherwise provided for; auxiliary operations therefore, e.g. preparation of the tyre
- B29D2030/0689—Incorporating sealants on or into tyres not otherwise provided for; auxiliary operations therefore, e.g. preparation of the tyre by incorporating the sealant into a plurality of chambers, e.g. bags, cells, tubes or closed cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/60—Multitubular or multicompartmented articles, e.g. honeycomb
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T152/00—Resilient tires and wheels
- Y10T152/10—Tires, resilient
- Y10T152/10495—Pneumatic tire or inner tube
- Y10T152/10666—Automatic sealing of punctures [e.g., self-healing, etc.]
- Y10T152/10675—Using flowable coating or composition
- Y10T152/10684—On inner surface of tubeless tire
- Y10T152/10693—Sealant in plural layers or plural pockets
Abstract
ABSTRACT OF THE DISCLOSURE A puncture sealant package for incorporation into a pneumatic tire is formed by coextruding a puncture sealant, and a skin forming material. The ribs are formed in an initially circular package profile as chords. After flow in a sheet die, the chords form divider ribs making small angles with the encapulating skin. The compartments formed by the ribs prevent flow of the sealant toward the center of a tire.
Description
A Method for Forming a Compartmented Puncture Sealant Package by Co-extrusion m e invention relates to a method and apparatus for forming a puncture sealant package to be incorporated into a tire. A
flowable puncture sealant is encapsulated into an envelope. The envelope containing the puncture sealant is then used to form the portion of an innerliner inside of the tread portion of a tire.
Puncture sealant incorporated in an envelope which does not absorb plasticizing oils from the puncture sealant allows one to stabilize the physical properties of a puncture sealant in a tire. A puncture sealant encapsulated in an incompatible envelope as an innerliner, is known from U.S. Patent 3,903,947 Emerson 1975. U.S. Patent 4,171,237 Bohm 1979, suggests laminating specifically designed rubber compounds using a co-extrusion method to form a puncture sealant composite. The concept of forming membranes in the puncture sealant package is known from U.S.
Patent 4,206,796 Chemizard 1980.
The Chemizard patent however does not teach a fast and accurate method of making the compartmented sealing package or a method for preventing air bubbles from heing trapped in the package. Also the angles for~ed by the partitions with the encapsulated walls appear to vary from abo~t 45 to 90. ~his is undesirable because as will be shcwn later, a puncturing object near a wall will w t have a sufficient reservoir of puncture sealant from which to draw.
Air bubbles in the package are detrimental in that it may be possible for a nail to hit an air bubble on its passage through the sealant, thus preventing the sealant from adhering to the nail and being drawn into the puncture when the nail is withdrawn.
Various extrusion methods are known for forming laminated films. See for example, U.S. Patent 3,479,425 Lefevre 1969 and U.S. Patent 3,557,265 Chisholn 1971. These extrusion patents also disclose using fonming dies i~ the manufacture of laminated films. They do not however remotely su~gest forming a puncture 1 ~ 6236~
sealant package for a tire or the idea of employing co-extrusion to form membranes separating compartments in the extruded package.
The present invention is intended to provide a remedy for all of the above-recited deficiencies of the prior art. The present invention provides a co-extrusion method which encapsula-tes sealant and forms membranes through the package providing compartments. The co-extrusion method prevents the incorporation of air or other gas bubbles into the sealant in the package and generates membranes which form compartments in the sealant package.
This invention encompasses a method and apparatus for forming a compartmented package for puncture sealant for use in the interior of a vehicle tire. A stream of puncture sealant having a uniform cross section and a stream of package forming material are simultaneously extrudated to encapsulate the puncture sealant in the packaging material. The so formed package is internally ribbed and compartmentalized with the ribs forming a junction at an angle of from 1 to 90 with the internal wall of the package. The method is carried out using a special die of the type depicted in Figure 1.
In particular, the present invention provides a method of forming a compartmented package containing puncture sealant for use in a tire, the steps of the method comprising:
~) providing a first stream of uniform cross-section of a puncture sealant; (b) providing a second stream of a package forming material; (c) encapsulating the puncture sealant stream within the package forming material; (d) forming continuous ribs of the package forming material through the puncture - 2a ~
sealant surrounded by package forming material; (e) supplying the compartmented stream of the puncture sealant to an extrusion die defining an elongate slot like orifice; and (f) forming and expanding the composite stream into a generally elongate configuration with ribs extending from package wall to package wall each rib forming a juncture angle of from 1 to 90 with a package wall.
In another aspect, the invention provides an apparatus for forming a compartmented package comprising: (a) a means for providing a first stream of uniform cross~section of a puncture sealant and a second stream of a package forming material;
(b) a means for encapsulating the puncture sealant stream within the package forming material; (c) a means for forming non-parallel continuous ribs of the package forming material through the puncture sealant surrounded by package forming material;
(d) a means for supplying the compartmented stream of the puncture sealant to an extrusion die defining an elongate slot like orifice; and (e) a means for forming and expanding the composite stream into a generally elongate configuration with ribs extending from package wall to package wall each rib forming a juncture angle of from 1 to 25 with a package wall.
The preferred way of carrying out the invention is described in detail below with reference to drawings, in which:
Figure 1 is a top view of a midplane section parallel to the feed block and sheet die.
Figure 2 shows an orifice plate which is positioned upstream of the membrane forming tubes for flow balance of .. .
1 ~ 62368 - 2b -sealant.
Figure 3 is a view of the block mandrel end piece looking upstream from the die.
Figure 4 is a cross-sectional view of the extrudant as it leaves the feed block having sealant 22 encapsulated by skin 18 and separated into components by membranes l9.
Figure 5 is a cross-sectional view of the packaged sealant of Figure 5 after it has been flattened by sheet die 14.
Figure 6 is a cross-sectional view of a puncture sealant assembly showing the location of the assembly 23 and the cord "strike-through" barrier compound 26 in a steel-belted radial tire 28.
The figures show an extruding apparatus designed to produce a sealant package to be used in a tire to seal punctures.
The package is shown in Figure 5 and comprises a sealant 22 which is encapsulated in a skin 18~ The sealant is flowable and is incompatible with skin 18 and membranes l9a and l9b. The reason for this is that it is necessary that the sealant not adhere to 1 1 6236~
the skin when ruptured because it is necessary that the sealant adhere to the rupturing or penetrating body. Ihis adhesion to the penetrant causes sealant to be drawn from areas surrounding the penetration as the penetrant passes through the sealant. When the penetrant is removed the sealant which adhered to it is drawn into the opening carried by the removal of the penetrant, and seals the opening. lt is also necessary that the plasticizer and other materials which give flow characters to the sealant not be absorbed by the skin 18 or the membranes l9a and l9b, as it is necessary that the sealant of the present invention remain in a flowable condition during the lifetime of the tire.
The formulations of an ethylene propylene diene mono~er (EPDM) based sealant and a nitrile rubber (NBR) membrane incompatible with the EPDM are set forth in Tables Ia and Ib.
_ 4 _ 1 ~ 6236~
TABrF Ia BASIC DESCRIPTION OF SEALANT
Sealant Parts EPD~ rubbera 100 Paraffinic oilh 120 Clay 15 Zinc Oxide 5 Diphenyl amine-acetone reaction productC 2 a Nordel*1070 b Sunpar*2280 c BLE*25 * Trade Mark :, ,, TABLE Ib BASIC DESCRIPTION OF MIGRATION LAYER (SKIN) Nitrile Envelope Parts Nitrile rubberd 100 Carbon ~lack (HAF)e 35 Carbon black (AUSTIN)f 20 Dioctyl phthalate 22.5 Phenolic resin~ 10 Brominated, phenolic resinh 5 Processing aid supplied by Technical Processing, Inc. and used as a release agentl 2 Zinc Oxide 5 Stearic Acid 2 Diphenyl amine-acetone reaction producti 2 Tetramethyl thiuram monosulfidek 0.1 N-t butyl 2 benzothiazole sulfenamide 1 2 Oil-treated insoluble sulfur (80% active)m 1.2 "
a Hycar*10~2-30 e HAF Black *
f Austin Black*
g SP25*Tackifier (Schenectady Chemicals) h SPl055 i TE-28-G~
J BLE*25 k Monex*(IMlM) 1 Santocure NS (IM) m Crystex*
~`
* Trade Mark .i .
;
I
~, . , .
~ 1 62368 ~ he sealant ingredients and the skin and membrane ingredients were milled separately, A co-extrusion line to make a sealant element 23 for a tire was set up using a 2-inch extruder (not shown) to process the sealant core 22 and a l-inch extruder (not shown) to process the skin and membrane rubber 18, l9a and 19b. Referring now to figures 1, 2 and 3, the sealant from the
flowable puncture sealant is encapsulated into an envelope. The envelope containing the puncture sealant is then used to form the portion of an innerliner inside of the tread portion of a tire.
Puncture sealant incorporated in an envelope which does not absorb plasticizing oils from the puncture sealant allows one to stabilize the physical properties of a puncture sealant in a tire. A puncture sealant encapsulated in an incompatible envelope as an innerliner, is known from U.S. Patent 3,903,947 Emerson 1975. U.S. Patent 4,171,237 Bohm 1979, suggests laminating specifically designed rubber compounds using a co-extrusion method to form a puncture sealant composite. The concept of forming membranes in the puncture sealant package is known from U.S.
Patent 4,206,796 Chemizard 1980.
The Chemizard patent however does not teach a fast and accurate method of making the compartmented sealing package or a method for preventing air bubbles from heing trapped in the package. Also the angles for~ed by the partitions with the encapsulated walls appear to vary from abo~t 45 to 90. ~his is undesirable because as will be shcwn later, a puncturing object near a wall will w t have a sufficient reservoir of puncture sealant from which to draw.
Air bubbles in the package are detrimental in that it may be possible for a nail to hit an air bubble on its passage through the sealant, thus preventing the sealant from adhering to the nail and being drawn into the puncture when the nail is withdrawn.
Various extrusion methods are known for forming laminated films. See for example, U.S. Patent 3,479,425 Lefevre 1969 and U.S. Patent 3,557,265 Chisholn 1971. These extrusion patents also disclose using fonming dies i~ the manufacture of laminated films. They do not however remotely su~gest forming a puncture 1 ~ 6236~
sealant package for a tire or the idea of employing co-extrusion to form membranes separating compartments in the extruded package.
The present invention is intended to provide a remedy for all of the above-recited deficiencies of the prior art. The present invention provides a co-extrusion method which encapsula-tes sealant and forms membranes through the package providing compartments. The co-extrusion method prevents the incorporation of air or other gas bubbles into the sealant in the package and generates membranes which form compartments in the sealant package.
This invention encompasses a method and apparatus for forming a compartmented package for puncture sealant for use in the interior of a vehicle tire. A stream of puncture sealant having a uniform cross section and a stream of package forming material are simultaneously extrudated to encapsulate the puncture sealant in the packaging material. The so formed package is internally ribbed and compartmentalized with the ribs forming a junction at an angle of from 1 to 90 with the internal wall of the package. The method is carried out using a special die of the type depicted in Figure 1.
In particular, the present invention provides a method of forming a compartmented package containing puncture sealant for use in a tire, the steps of the method comprising:
~) providing a first stream of uniform cross-section of a puncture sealant; (b) providing a second stream of a package forming material; (c) encapsulating the puncture sealant stream within the package forming material; (d) forming continuous ribs of the package forming material through the puncture - 2a ~
sealant surrounded by package forming material; (e) supplying the compartmented stream of the puncture sealant to an extrusion die defining an elongate slot like orifice; and (f) forming and expanding the composite stream into a generally elongate configuration with ribs extending from package wall to package wall each rib forming a juncture angle of from 1 to 90 with a package wall.
In another aspect, the invention provides an apparatus for forming a compartmented package comprising: (a) a means for providing a first stream of uniform cross~section of a puncture sealant and a second stream of a package forming material;
(b) a means for encapsulating the puncture sealant stream within the package forming material; (c) a means for forming non-parallel continuous ribs of the package forming material through the puncture sealant surrounded by package forming material;
(d) a means for supplying the compartmented stream of the puncture sealant to an extrusion die defining an elongate slot like orifice; and (e) a means for forming and expanding the composite stream into a generally elongate configuration with ribs extending from package wall to package wall each rib forming a juncture angle of from 1 to 25 with a package wall.
The preferred way of carrying out the invention is described in detail below with reference to drawings, in which:
Figure 1 is a top view of a midplane section parallel to the feed block and sheet die.
Figure 2 shows an orifice plate which is positioned upstream of the membrane forming tubes for flow balance of .. .
1 ~ 62368 - 2b -sealant.
Figure 3 is a view of the block mandrel end piece looking upstream from the die.
Figure 4 is a cross-sectional view of the extrudant as it leaves the feed block having sealant 22 encapsulated by skin 18 and separated into components by membranes l9.
Figure 5 is a cross-sectional view of the packaged sealant of Figure 5 after it has been flattened by sheet die 14.
Figure 6 is a cross-sectional view of a puncture sealant assembly showing the location of the assembly 23 and the cord "strike-through" barrier compound 26 in a steel-belted radial tire 28.
The figures show an extruding apparatus designed to produce a sealant package to be used in a tire to seal punctures.
The package is shown in Figure 5 and comprises a sealant 22 which is encapsulated in a skin 18~ The sealant is flowable and is incompatible with skin 18 and membranes l9a and l9b. The reason for this is that it is necessary that the sealant not adhere to 1 1 6236~
the skin when ruptured because it is necessary that the sealant adhere to the rupturing or penetrating body. Ihis adhesion to the penetrant causes sealant to be drawn from areas surrounding the penetration as the penetrant passes through the sealant. When the penetrant is removed the sealant which adhered to it is drawn into the opening carried by the removal of the penetrant, and seals the opening. lt is also necessary that the plasticizer and other materials which give flow characters to the sealant not be absorbed by the skin 18 or the membranes l9a and l9b, as it is necessary that the sealant of the present invention remain in a flowable condition during the lifetime of the tire.
The formulations of an ethylene propylene diene mono~er (EPDM) based sealant and a nitrile rubber (NBR) membrane incompatible with the EPDM are set forth in Tables Ia and Ib.
_ 4 _ 1 ~ 6236~
TABrF Ia BASIC DESCRIPTION OF SEALANT
Sealant Parts EPD~ rubbera 100 Paraffinic oilh 120 Clay 15 Zinc Oxide 5 Diphenyl amine-acetone reaction productC 2 a Nordel*1070 b Sunpar*2280 c BLE*25 * Trade Mark :, ,, TABLE Ib BASIC DESCRIPTION OF MIGRATION LAYER (SKIN) Nitrile Envelope Parts Nitrile rubberd 100 Carbon ~lack (HAF)e 35 Carbon black (AUSTIN)f 20 Dioctyl phthalate 22.5 Phenolic resin~ 10 Brominated, phenolic resinh 5 Processing aid supplied by Technical Processing, Inc. and used as a release agentl 2 Zinc Oxide 5 Stearic Acid 2 Diphenyl amine-acetone reaction producti 2 Tetramethyl thiuram monosulfidek 0.1 N-t butyl 2 benzothiazole sulfenamide 1 2 Oil-treated insoluble sulfur (80% active)m 1.2 "
a Hycar*10~2-30 e HAF Black *
f Austin Black*
g SP25*Tackifier (Schenectady Chemicals) h SPl055 i TE-28-G~
J BLE*25 k Monex*(IMlM) 1 Santocure NS (IM) m Crystex*
~`
* Trade Mark .i .
;
I
~, . , .
~ 1 62368 ~ he sealant ingredients and the skin and membrane ingredients were milled separately, A co-extrusion line to make a sealant element 23 for a tire was set up using a 2-inch extruder (not shown) to process the sealant core 22 and a l-inch extruder (not shown) to process the skin and membrane rubber 18, l9a and 19b. Referring now to figures 1, 2 and 3, the sealant from the
2-inch extruder was fed into inlet 4 of feed block 2. The skin and membrane rub~er 18, l9a and l9b was fed into inlet 6. The stream of sealant passing into inlet 4 of feed block 2 is separated into three separate streams by three holes 9a, 9b and 9c in orifice plate 8 (see Fig. 2) positioned upstream of membrane forming tube slits 12a and 12b. Each of the three streams formed by orifice plate 8 are sep,arated by membranes l9a and l9b (see Fig. 3) for,~Rd at slits 12a, 12b (see Fig. 2) and surrounded by skin 18 extruded past the feed block mandrel end piece 17 from orlfice 25 onto the sealant 22 in the feed block at 16. Inlet 6 is in direct conmunicatior, with skin forming outlet 25. Ihe membrane forming mechanism was formed by inserting two tubes, lOa and lOb through channel 4 of feed block 2. The openings 20a and 20b of the tubes lOa and lOb were open to and fed from the skin canal 7. Openings 20a and 20b in tubes lOa and lOb are shown in -figures 1 a,nd 3. Fine slits 12a and 12b cut into each tube lOa and lOb along their lengths lets rubber out as membranes into the sealant stream. The tubes have a length of 0.675 inches'(l.71 cm) and a diameter of 0.080 inches (0.203 cm). See figure 3 for a cross-sectional view of the feed block mandrel end piece showing the membrane forming slit tubes. Ihe orifice plate 8 was positioned upstream of the slit tubes to control the flow rates of sealant streams through the passages formed by the tubes lOa and lOb. Ihe internal diameter of the orifices were 9/23 inches (1.0 cm), 12/23 inches (1.3 cm) and 9/23 inches (1.0 cm3. The larger orifice 9a fed the center compartment and the ~maller orifices 9b and 9c f~d the side compartments formed by membranes l9a and l9b extruded from the slit tubes. The function of the orifice plate 8 was to properly balance the three final stream~ of sealant 22.
!
The two tubes lOa and lOb were located different distances from the orifice plate so that each could be placed at any angle to the skin forming orifice.
After formation of the sealant 22 separated by membranes 19 and encapsulated by skin 18, the combined streams flow through sheet die 14 where the assembly is changed from a rod to a sheet shape. Extrusion temperature ranged from 160F (71.1C) to 200F
(93 3C? with the nitrile rubber stock temperature preferably 20F
(11.1C) higher than the sealant temperature giving optimum sealant results.
Because of orifice plate 8, the ratio of the three final sealant streams tended to be m~re consistent re~ardless of extruder speed.
The puncture sealant package 23 had a width of 6.5 inches (16.6 cm). Each compartment ha~ a width including the skin of about 2.3 inches (5.8 cm). The package wa~ about 0.11 inches thick (0.28 cm).
i A radial tire 28 was built in a conventional nanner positioning the sealant package 23 between the innerliner 27 and the cord "strike through" barrie~ compound 26. See figure 6 for a cross-sectional view of the tire.
In order to prevent the radial cords from pulling into the puncture sealant package in the building of the tire, a cord strike through barrier 26 was placed between the sealant package and the adjacent body ply. The fonmulation of the cord barrier compound is set forth in Table lI.
, 1 3 623~8 TABLE II
~ORMULATION OF OORD BARRIER COMPOUND
Parts Natural Rubber 96.54 Styrene butadiene rubber 3.46 Wood cellulose fibers (290 microns lon~ by 18 microns diameter)n 18.00 Wood cellulose fibers (55 microns long by 9 microns diameter) 17.40 Carbon blackP 50.00 Styrenated Phenol Antoxidantq l.OO
Naphthenic Oil Type 103r 11.00 Zinc Oxide 3.00 Stearic Acid l.OO
Octylphenol formaldehyde resinS 2.00 2, 2-benzothiazldisulfidet 1.00 Tetra methylthiuram monosulfideU 0~10 Oil-treated insoluble sulfur (80% active)V 3.00 n Solka-Floc KS-1016 (Harwick Chemical) Solka-Floc BW-lOO*(Harwick Chemical) i P ISAF Black*
q Win~stay S*(Goodyear) r Circosol 42XH (Sun Petroleum) s Arofene 8318*
t MBTS*(Am. Cyanamide) u Monex*(~lTM) v Crystex *
, .
.
* Trade Mark ?
. , 1~;....
1 1 6236~
g Because the sealant assembly plus cord barrier compound represent added gauge ( 0.190" = 4.8 mm), the cure cycle of the tire had to be extended in order to allow more time for heat to transfer from the curing bladder to the area under the tread and belts.
Testing in use of tires produced by the present invention established that sealant remained in place. Other sealant packages without partitions were made and tested and the sealant did not remain in place. Sealant was somehow moved toward the center. It is believed that flexing of the tread as it passed through the footprint somehow resulted in a pumping action. In any event, the membranes prevented the migration of the sealant across the inside of the tread area of the tire. Ihe membranes also adequately provided for puncturing objects to be coated with 15; sealant and the sealant be pulled with the puncturing object into the hole fonmed in the tire.
Any number of membranes can be incorporated irlto a sealant package depending of course on sealant migration problem~
encountered.
In addition, various sealahts and packaging materials can be used as i8 shown in the prior art referred to earlier.
In testing the sealant package of the present invention it was found, using layers of dlfferent colored sealant, that when a nail punctured a tire the sealant broke loose from the elastomer -layer next to the tire, adhered to the nail and was drawn by the nail fr~m a large area of the package. When the nail was withdrawn, the sealant broke loose from ~the inner elastomer layer adhered to the nail and was again drawn from a large area of the package. As the nail left the hole, the sealant accumulated and was drawn into the hole.
!
The two tubes lOa and lOb were located different distances from the orifice plate so that each could be placed at any angle to the skin forming orifice.
After formation of the sealant 22 separated by membranes 19 and encapsulated by skin 18, the combined streams flow through sheet die 14 where the assembly is changed from a rod to a sheet shape. Extrusion temperature ranged from 160F (71.1C) to 200F
(93 3C? with the nitrile rubber stock temperature preferably 20F
(11.1C) higher than the sealant temperature giving optimum sealant results.
Because of orifice plate 8, the ratio of the three final sealant streams tended to be m~re consistent re~ardless of extruder speed.
The puncture sealant package 23 had a width of 6.5 inches (16.6 cm). Each compartment ha~ a width including the skin of about 2.3 inches (5.8 cm). The package wa~ about 0.11 inches thick (0.28 cm).
i A radial tire 28 was built in a conventional nanner positioning the sealant package 23 between the innerliner 27 and the cord "strike through" barrie~ compound 26. See figure 6 for a cross-sectional view of the tire.
In order to prevent the radial cords from pulling into the puncture sealant package in the building of the tire, a cord strike through barrier 26 was placed between the sealant package and the adjacent body ply. The fonmulation of the cord barrier compound is set forth in Table lI.
, 1 3 623~8 TABLE II
~ORMULATION OF OORD BARRIER COMPOUND
Parts Natural Rubber 96.54 Styrene butadiene rubber 3.46 Wood cellulose fibers (290 microns lon~ by 18 microns diameter)n 18.00 Wood cellulose fibers (55 microns long by 9 microns diameter) 17.40 Carbon blackP 50.00 Styrenated Phenol Antoxidantq l.OO
Naphthenic Oil Type 103r 11.00 Zinc Oxide 3.00 Stearic Acid l.OO
Octylphenol formaldehyde resinS 2.00 2, 2-benzothiazldisulfidet 1.00 Tetra methylthiuram monosulfideU 0~10 Oil-treated insoluble sulfur (80% active)V 3.00 n Solka-Floc KS-1016 (Harwick Chemical) Solka-Floc BW-lOO*(Harwick Chemical) i P ISAF Black*
q Win~stay S*(Goodyear) r Circosol 42XH (Sun Petroleum) s Arofene 8318*
t MBTS*(Am. Cyanamide) u Monex*(~lTM) v Crystex *
, .
.
* Trade Mark ?
. , 1~;....
1 1 6236~
g Because the sealant assembly plus cord barrier compound represent added gauge ( 0.190" = 4.8 mm), the cure cycle of the tire had to be extended in order to allow more time for heat to transfer from the curing bladder to the area under the tread and belts.
Testing in use of tires produced by the present invention established that sealant remained in place. Other sealant packages without partitions were made and tested and the sealant did not remain in place. Sealant was somehow moved toward the center. It is believed that flexing of the tread as it passed through the footprint somehow resulted in a pumping action. In any event, the membranes prevented the migration of the sealant across the inside of the tread area of the tire. Ihe membranes also adequately provided for puncturing objects to be coated with 15; sealant and the sealant be pulled with the puncturing object into the hole fonmed in the tire.
Any number of membranes can be incorporated irlto a sealant package depending of course on sealant migration problem~
encountered.
In addition, various sealahts and packaging materials can be used as i8 shown in the prior art referred to earlier.
In testing the sealant package of the present invention it was found, using layers of dlfferent colored sealant, that when a nail punctured a tire the sealant broke loose from the elastomer -layer next to the tire, adhered to the nail and was drawn by the nail fr~m a large area of the package. When the nail was withdrawn, the sealant broke loose from ~the inner elastomer layer adhered to the nail and was again drawn from a large area of the package. As the nail left the hole, the sealant accumulated and was drawn into the hole.
Claims (7)
1. A method of forming a compartmented package containing puncture sealant for use in a tire, the steps of the method comprising a) providing a first stream of unifonm cross-section of a puncture sealant.
b) providing a second stream of a package forming material;
c) encapsulating the puncture sealant stream within the package forming material;
d) forming continuous ribs of the package forming material through the puncture sealant surrounded by package forming material;
e) supplying the compartmented stream of the puncture sealant to an extrusion die defining an elongate slot like orifice; and f) forming and expanding the composite stream into a generally elongate configuration with ribs extending from package wall to package wall each rib forming a juncture angle of from 1° to 90° with a package wall.
b) providing a second stream of a package forming material;
c) encapsulating the puncture sealant stream within the package forming material;
d) forming continuous ribs of the package forming material through the puncture sealant surrounded by package forming material;
e) supplying the compartmented stream of the puncture sealant to an extrusion die defining an elongate slot like orifice; and f) forming and expanding the composite stream into a generally elongate configuration with ribs extending from package wall to package wall each rib forming a juncture angle of from 1° to 90° with a package wall.
2. The method of claim 1 wherein two ribs are formed.
3. The method of claim 2 wherein end compartments, separated from a center compartment by the two ribs, of approximately equal size and shape are formed.
4. The method of claim 1 wherein the packaging material and the puncture sealant are incompatible.
5. The method of claim 1 wherein the elongated slot orifice is thinner at the edges than at its center.
6. The method of claim 1 wherein each rib forms an angle with the package wall of from 1° to 25°.
7. An apparatus for forming a compartmented package comprising:
a) a means for providing a first stream of uniform cross-section of a puncture sealant and a second stream of a package forming material.
b) a means for encapsulating the puncture sealant stream within the package forming material;
c) a means for forming non-parallel continuous ribs of the package forming material through the puncture sealant surrounded by package forming material;
d) a means for supplying the compartmented stream of the puncture sealant to an extrusion die defining an elongate slot like orifice; and e) a means for forming and expanding the composite stream into a generally elongate configuration with ribs extending from package wail to package wall each rib forming a juncture angle of from 1° to 25° with a package wall.
a) a means for providing a first stream of uniform cross-section of a puncture sealant and a second stream of a package forming material.
b) a means for encapsulating the puncture sealant stream within the package forming material;
c) a means for forming non-parallel continuous ribs of the package forming material through the puncture sealant surrounded by package forming material;
d) a means for supplying the compartmented stream of the puncture sealant to an extrusion die defining an elongate slot like orifice; and e) a means for forming and expanding the composite stream into a generally elongate configuration with ribs extending from package wail to package wall each rib forming a juncture angle of from 1° to 25° with a package wall.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US307,401 | 1981-10-01 | ||
| US06/307,401 US4388261A (en) | 1981-10-01 | 1981-10-01 | Method for forming a compartmented puncture sealant package by co-extrusion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1162368A true CA1162368A (en) | 1984-02-21 |
Family
ID=23189600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000409149A Expired CA1162368A (en) | 1981-10-01 | 1982-08-10 | Method for forming a compartmented puncture sealant package by coextrusion |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4388261A (en) |
| CA (1) | CA1162368A (en) |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4485062A (en) * | 1983-07-05 | 1984-11-27 | E. I. Du Pont De Nemours And Company | Process for extruding polymers |
| US4664168A (en) * | 1985-01-22 | 1987-05-12 | The Uniroyal Goodrich Tire Company | Self-sealing tire with edge strips for tire sealant |
| US4913209A (en) * | 1985-01-22 | 1990-04-03 | The Uniroyal Goodrich Tire Company | Sealant product, laminate thereof, and pneumatic tire constructed therewith |
| US4816101A (en) * | 1987-08-27 | 1989-03-28 | The Uniroyal Goodrich Tire Company | Process for extruding a puncture sealant and forming an elastomeric laminate |
| JPH01208207A (en) * | 1988-02-16 | 1989-08-22 | Bridgestone Corp | Pneumatic tire |
| US5178702A (en) * | 1991-04-04 | 1993-01-12 | The Goodyear Tire & Rubber Company | Pneumatic tire having a multilayered innerliner |
| US5976996A (en) * | 1996-10-15 | 1999-11-02 | Warwick Mills, Inc. | Protective fabric having high penetration resistance |
| US6720277B1 (en) | 1994-08-29 | 2004-04-13 | Warwick Mills, Inc. | Protective fabric having high penetration resistance |
| JP3497280B2 (en) * | 1995-06-02 | 2004-02-16 | 本田技研工業株式会社 | Tire wheels |
| JP3497311B2 (en) * | 1995-12-26 | 2004-02-16 | 本田技研工業株式会社 | Manufacturing method of tire tube containing sealant |
| US6693052B2 (en) | 1996-10-15 | 2004-02-17 | Warwick Mills, Inc. | Garment including protective fabric |
| JPH11245313A (en) * | 1998-03-04 | 1999-09-14 | Honda Motor Co Ltd | Manufacture of tire tube containing sealing agent, and its vulcanizer |
| JP3917314B2 (en) * | 1999-02-01 | 2007-05-23 | 住友ゴム工業株式会社 | Pneumatic tire and method for manufacturing pneumatic tire |
| US6506273B1 (en) * | 1999-08-21 | 2003-01-14 | Jack L. Hull | Tire sealant system |
| US6915826B2 (en) * | 2002-12-06 | 2005-07-12 | The Goodyear Tire & Rubber Company | Puncture sealing pneumatic tire |
| US20060169393A1 (en) * | 2005-01-28 | 2006-08-03 | Botts Bina P | Method and apparatus for extruding a puncture sealant and mounting on a tire |
| US20070107824A1 (en) * | 2005-11-16 | 2007-05-17 | Hahn Bruce R | Rubber formulation with adhesive-compatible surface |
| US20080142140A1 (en) * | 2006-12-15 | 2008-06-19 | Patrick David Marks | Method and apparatus for building a puncture sealant tire |
| US8617333B2 (en) | 2007-09-20 | 2013-12-31 | The Goodyear Tire & Rubber Company | Pneumatic tire having built-in sealant layer and preparation thereof |
| US20090078353A1 (en) * | 2007-09-21 | 2009-03-26 | Ramendra Nath Majumdar | Pneumatic Tire Having Built-In Sealant Layer And Preparation Thereof |
| US8316903B2 (en) | 2007-10-01 | 2012-11-27 | The Goodyear Tire & Rubber Company | Pneumatic tire having built-in sealant layer and preparation thereof |
| US8221573B2 (en) * | 2007-12-21 | 2012-07-17 | The Goodyear Tire & Rubber Company | Method and apparatus for building a puncture sealant preassembled component |
| US8646501B2 (en) | 2010-11-11 | 2014-02-11 | The Goodyear Tire & Rubber Company | Puncture sealant laminate |
| US8617334B2 (en) | 2011-09-12 | 2013-12-31 | The Goodyear Tire & Rubber Company | Method and apparatus for making a compartmentalized tire sealant strip |
| US9694629B1 (en) | 2012-02-29 | 2017-07-04 | Carolyn Dry | Self-repairing inflatable articles incorporating an integrated self-repair system |
| US8685513B1 (en) | 2012-02-29 | 2014-04-01 | Carolyn M. Dry | Inflatable articles comprising a self-repairing laminate |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA872880A (en) * | 1971-06-08 | Kawamura Yuzo | Method and apparatus for manufacturing synthetic resin products containing foamed synthetic substances | |
| US1959460A (en) * | 1930-07-11 | 1934-05-22 | Jesse R Crossan | Method of producing punctureproof tire tubes |
| US2161490A (en) * | 1937-11-01 | 1939-06-06 | James W Waber | Inner tube |
| US2748401A (en) * | 1952-06-30 | 1956-06-05 | Hedwin Corp | Extruded flexible and hollow articles and method of making same |
| US2877819A (en) * | 1953-03-03 | 1959-03-17 | Seiberling Rubber Co | Puncture sealing pneumatic tire |
| US2736921A (en) * | 1953-06-24 | 1956-03-06 | Us Rubber Co | Method and apparatus for forming self-sealing inner tube |
| DE1016009B (en) * | 1954-07-15 | 1957-09-19 | Anton Reifenhaeuser Fa | Process for the extrusion of hollow bodies made of thermoplastic material |
| US3270393A (en) * | 1962-12-13 | 1966-09-06 | Gen Motors Corp | Method for forming resilient plastic seat elements |
| US3479425A (en) * | 1965-07-22 | 1969-11-18 | Dow Chemical Co | Extrusion method |
| US3557265A (en) * | 1967-12-29 | 1971-01-19 | Dow Chemical Co | Method of extruding laminates |
| US3645837A (en) * | 1967-12-29 | 1972-02-29 | Dow Chemical Co | Laminates |
| US3668288A (en) * | 1968-11-18 | 1972-06-06 | Keiichi Takahashi | Method for making thermoplastic synthetic resin hollow structure articles |
| DE2123331C3 (en) * | 1970-05-11 | 1975-10-16 | Fumio Kodaira Tokio Miyamoto (Japan) | Extruder head for producing a three-layer composite panel from thermoplastics |
| US3855376A (en) * | 1971-04-15 | 1974-12-17 | Mitsubishi Rayon Co | Process for making structural material having a foamed inner layer |
| US3825641A (en) * | 1971-06-04 | 1974-07-23 | L Barnett | Method of forming multiple passageway plastic conduit |
| CA1007015A (en) * | 1971-09-27 | 1977-03-22 | Walter J. Schrenk | Coextrusion apparatus |
| CA987211A (en) * | 1973-05-03 | 1976-04-13 | Roy J. Emerson | Puncture sealing means for pneumatic tires |
| US4171237A (en) * | 1975-09-22 | 1979-10-16 | The Firestone Tire & Rubber Company | Sealant laminates |
| FR2383032A1 (en) * | 1977-03-08 | 1978-10-06 | Michelin & Cie | PNEUMATIC WITH SELF-CLOSING INTERNAL COATING |
| US4359354A (en) * | 1980-03-03 | 1982-11-16 | The Firestone Tire & Rubber Company | Method of forming self-sealing tire body composite for tires |
-
1981
- 1981-10-01 US US06/307,401 patent/US4388261A/en not_active Expired - Fee Related
-
1982
- 1982-08-10 CA CA000409149A patent/CA1162368A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4388261A (en) | 1983-06-14 |
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