JP2010058290A - Method for molding tire composite member and method for manufacturing pneumatic tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for molding tire composite member which can easily mold the tire composite member in which unvulcanized rubber layers are piled up on both sides of an inner liner layer made of a film of a thermoplastic resin or a thermoplastic elastomer composition and a method for producing a pneumatic tire. <P>SOLUTION: In the method for molding the tire composite member 1, the unvulcanized rubber layers 3 and 4 are piled up on both inner and outer sides of the cylindrical inner liner layer 2 made of the film of the thermoplastic resin or the thermoplastic elastomer composition in which an elastomer is blended in a thermoplastic resin. After a cylindrical semi-composite 10 is formed by piling up the first unvulcanized rubber layer 3 on the outer surface 2A of the inner liner layer 2, by moving the semi-composite 10 while it is turned back from the side of one end in the width direction through a roller 11, the semi-composite 10 is turned over. The second unvulcanized rubber layer 4 is piled up on the outer surface 10'X of the turned-over semi-composite 10' to mold the tire composite member 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for forming a tire composite member in which an unvulcanized rubber layer is laminated on both surfaces of an inner liner layer and a method for manufacturing a pneumatic tire using the tire composite member formed by the method.

  Conventionally, a pneumatic tire using a film made of a thermoplastic resin or a thermoplastic elastomer composition obtained by blending an elastomer in a thermoplastic resin as an inner liner layer is known (see, for example, Patent Document 1). Accordingly, there is an advantage that the inner liner layer can be reduced in weight and the fuel efficiency of the vehicle can be improved.

  In such a pneumatic tire, an adhesive tie rubber layer is usually interposed between the inner liner layer and the carcass layer in order to ensure adhesion between the inner liner layer and the carcass layer. Further, the inner liner layer made of a film of a thermoplastic resin or a thermoplastic elastomer composition may be scratched on the surface when rubbed with a shrinking bladder at the end of vulcanization. In order to prevent this, measures are taken to provide a protective rubber layer on the inside.

  The pneumatic tire described above is generally manufactured using a molding drum. However, since the inner liner layer is film-like and thin, the work of attaching to the molding drum is complicated, and it is difficult to handle the inner liner layer. Therefore, it is preferable from the viewpoint of handling and productivity that a tire composite member in which a tie rubber layer and a protective rubber layer are laminated on both the inner and outer surfaces of the inner liner layer is molded in advance and attached to a molding drum.

When molding such a tire composite member, for example, use a method in which a cylindrical material is wound around a molding roller and an auxiliary roller, and an unvulcanized rubber sheet is pressure-bonded to the outer surface of the cylindrical material by a pressure roller. (For example, refer to Patent Document 2). By this method, a semi-composite in which an unvulcanized protective rubber sheet is pressure-bonded to the outer surface of the carcass layer is molded, turned upside down, and the half-composite turned over again on the molding roller and the auxiliary roller. The above-mentioned composite member can be obtained by crimping an unvulcanized tie rubber sheet to the outer surface of the semi-composite turned upside down. However, since the work of turning over the semi-composite relies on human labor, the work of turning over the semi-composite is cumbersome, and an improvement measure has been desired.
Japanese Patent Laid-Open No. 10-25375 JP 2007-320129 A

  An object of the present invention is to form a tire composite member capable of easily forming a tire composite member in which an unvulcanized rubber layer is laminated on both surfaces of an inner liner layer made of a film of a thermoplastic resin or a thermoplastic elastomer composition. The object is to provide a method and a method for manufacturing a pneumatic tire.

  The method for molding a tire composite member of the present invention that achieves the above-mentioned object is not applied to both inner and outer surfaces of a cylindrical inner liner layer made of a thermoplastic resin or a film of a thermoplastic elastomer composition obtained by blending an elastomer in a thermoplastic resin. A method of molding a tire composite member in which a vulcanized rubber layer is laminated, the first unvulcanized rubber layer being laminated on an outer surface of a cylindrical inner liner layer to form a cylindrical semi-composite, The composite is moved while being folded back from one end in the width direction via a roller, so that the semi-composite is turned upside down, and a second unvulcanized rubber layer is laminated on the outer surface of the turned-up semi-composite to form a tire composite member It is characterized by molding.

  The method for producing a pneumatic tire of the present invention includes a green tire in which an unvulcanized rubber layer is laminated on both the inner and outer surfaces of an inner liner layer made of a thermoplastic elastomer composition or a film of a thermoplastic elastomer composition obtained by blending an elastomer in a thermoplastic resin. When molding a tire, a tire composite member molded by the above-described tire composite member molding method is used.

  According to the present invention described above, the semi-composite in which the first unvulcanized rubber layer is laminated on the outer surface of the inner liner layer is turned upside down by being turned back from the one end side in the width direction via a roller. Since the operation becomes easy, a tire composite member in which an unvulcanized rubber layer is laminated on both surfaces of an inner liner layer made of a film of a thermoplastic resin or a thermoplastic elastomer composition can be easily formed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows one embodiment of a method for molding a tire composite member of the present invention, and FIG. 2 shows an example of a tire composite member formed by the method. The tire composite member 1 includes a thermoplastic resin or an inner surface of a cylindrical inner liner layer 2 made of a thermoplastic elastomer composition film in which an elastomer is blended with a thermoplastic resin. While a sulfur protective rubber layer 3 is laminated, an unvulcanized tie rubber layer 4 disposed for adhesion between the inner liner layer 2 and the carcass layer is laminated on the outer surface.

  First, as shown in FIG. 1A, such a tire composite member 1 is formed with a long tubular film 6 folded into a sheet by an inflation molding machine 5. That is, a film material made of a thermoplastic resin or a thermoplastic elastomer composition is melted and kneaded by a single screw extruder 5A, continuously extruded from a cylindrical die 5B, and a cylindrical film 6 inflated to a predetermined diameter is obtained. Mold continuously.

  The formed tubular film 6 is cooled by cooling air by the air ring 5C, and then deformed into a flat shape by the guide means 5D so as to gradually reduce the minor axis side. The cylindrical film 6 deformed into a flat shape is sandwiched between a pair of pinch rolls 5E and folded into a sheet shape. The tubular film 6 folded into a sheet shape is wound up in a roll shape around a winding core 5G via a guide roll 5F.

  The long tubular film 6 thus obtained is unwound and conveyed to the cutting step as shown in FIG. In this cutting step, the tubular inner liner layer 2 made of a film is formed by cutting the folded tubular film 6 into a length corresponding to one tire with a cutter 7 with the cut side expanded in a tubular shape. To do.

  The formed cylindrical inner liner layer 2 is then sent to the step of laminating the protective rubber layer 3 (first unvulcanized rubber layer) on the outer surface 2A shown in FIG. In this laminating process, the inner liner layer 2 is wound around the upper and lower forming rollers 7 and 8, and the outer surface 2A of the inner liner layer 2 that moves around by the pressure roller 9 is rounded to a predetermined length over the entire circumference. Sulfur protective rubber layer 3 is sequentially pressure-bonded and laminated, and cylindrical semi-composite body 10 in which unvulcanized protective rubber layer 3 is annularly laminated on outer surface 2A of inner liner layer 2 is formed.

  This semi-composite 10 is formed by reversing the cutting and laminating steps as shown in FIGS. 3A and 3B instead of the steps shown in FIGS. 1B and 1C. Also good. That is, as shown in FIG. 3 (A), the upper and lower winding cores 50 unwind on the upper and lower surfaces (outer surfaces) of the long tubular film 6 folded from the winding core 5G into a sheet shape. The formed sheet-like protective rubber layer 3 (first unvulcanized rubber layer) is sequentially pressure-bonded and laminated by the upper and lower pressure-bonding rolls 51 to form a film / rubber laminate 52.

  Next, the film / rubber laminate 52 is conveyed to the cutting step shown in FIG. 3B, where the film / rubber laminate 52 is equivalent to one tire by the cutter 53 with the cut side inflated in a cylindrical shape. The cylindrical semi-composite 10 in which the unvulcanized protective rubber layer 3 is laminated on the outer surface of the inner liner layer 2 is molded.

  The semi-composite 10 thus molded is then conveyed to the inside-out process shown in FIG. In this reversal step, the semi-composite 10 is turned upside down by moving the semi-composite 10 from the outer side in the width direction through the folding roller 11 while being folded back from the inside. Examples of the turning device used here include those shown in FIGS.

  The reversing device shown in FIGS. 4 and 5 includes a reversing means 12 for reversing the semi-composite 10 and a feeding means 13 for feeding the semi-composite 10 to the reversing means 12 on the base 14. The reversing means 12 includes a reversing portion 18 having a plurality of tension rollers 16 arranged in an arc and one bifurcated reversing arm 17 on the side of a support frame 15 erected on a base 14. And it arrange | positions circularly at four places of right and left. The four reversing portions 18 can move toward and away from the center of the circle synchronously. The tension roller 16 can also move close to and away from the center of the circle of the reversing unit 18 in synchronization with each other, and the reversing arm 17 can turn around the base point 19.

  The feeding means 13 includes a moving body 20 that is movable on the base 14 in a direction of approaching and separating from the inside-out means 12. A support plate 21 is erected on the movable body 20, and a plurality of guide arms 22 horizontally provided are provided on the side surface of the support plate 21. The semi-composite 10 is held by this guide arm 22, and in the figure, two guide arms 22 are shown, but two upper and lower guide arms 22 and two left and right guide arms 22 ( (Not shown) are arranged in a circle, and the four guide arms 22 can reciprocate synchronously as indicated by arrows toward the center of the circle.

  The semi-composite 10 can be turned inside out as shown in FIG. 6 by the apparatus described above. First, as shown in FIG. 6A, the guide arm 22 moves in the direction of separation as indicated by the arrow M <b> 1, and the semi-complex 10 is held by the guide arm 22. When the holding is completed, the moving body 20 moves toward the inverting means 12 as shown by the arrow M2 as shown in FIG. 6B, and sends the semi-complex 10 held by the guide arm 22 to the inverting means 12 side. .

  Next, the tension roller 16 moves outward (in the direction of separation) as indicated by an arrow M3, and the inner surface of the semi-composite 10 is held by the outer periphery of the plurality of tension rollers 16 arranged in an arc shape. At this time, the outer peripheral diameter of the tension roller 16 is configured to be substantially the same as the inner shape of the semi-composite 10 in order to prevent wrinkles from occurring in the inverted half-composite 10 '. . When the movement of the tension roller 16 is finished, the guide arm 22 moves in the direction approaching as shown by the arrow M4, and the holding of the semi-composite 10 is released.

  As shown in FIG. 6C, the moving body 20 moves in a direction away from the reversing means 12 as indicated by an arrow M5, and returns to the original position shown in FIG. Next, the guide arm 22 moves in the direction of separation as indicated by the arrow M6, while the reversing arm 17 pivots around the base point 19 as indicated by the arrow M7, and tensions the semi-complex 10 from one end in the width direction. Fold back from the outside through the roller 16.

When the semi-composite 10 is folded, as shown in FIG. 6D, the reversing arm 17 pivots as indicated by an arrow M8 and returns to the standby position shown in FIG. The moving body 20 moves toward the reversing means 12 as shown by an arrow M9, and the semi-composite 10 ′ in which the guide arm 22 is turned upside down.
(In the state of FIG. 6C), the guide arm 22 holds the semi-composite 10 ′ from the inside. When the guide arm 22 is held, the moving body 20 further advances by a predetermined amount. As a result, the non-inverted portion of the semi-composite 10 ′ that moves together with the guide arm 22 is folded back via the tension roller 16, and the fully folded half-composite 10 ′ shown in FIG. become.

  Next, as shown in FIG. 6E, the moving body 20 moves away from the reversing means 12 as indicated by an arrow M10 and returns to the original position shown in FIG. As indicated by M11, the robot moves in the approaching direction and returns to the standby position shown in FIG. Next, as shown in FIG. 6 (F), the guide arm 22 moves in the approaching direction as indicated by the arrow M12, returns to the standby position shown in FIG. 4, and releases the held half-complex 10 ′. . By removing the semi-composite 10 ′ from the guide arm 22, an inverted half-composite 10 ′ is obtained.

  The inverted half-composite 10 'is then sent to the step of laminating the tie rubber layer 4 (second unvulcanized rubber layer) on the outer surface 10'X shown in FIG. 1 (E). This lamination process is performed in the same manner as the lamination process shown in FIG. That is, the inverted half-composite 10 ′ is wound around the upper and lower forming rollers 7, 8, and is cut to a predetermined length over the outer surface 10 ′ X of the semi-composite 10 ′ that moves around by the pressure roller 9. The unvulcanized tie rubber layer 4 is sequentially pressed and laminated, and the tire composite member 1 is formed by laminating the unvulcanized die rubber layer 4 in an annular shape on the outer surface 10′X of the inverted half-composite 10 ′.

  The molded tire composite member 1 is placed on the storage plate 23 in a state of being crushed into a sheet shape as shown in FIG. 1 (F) until use, or as shown in FIG. 1 (G). In a cylindrical state, the storage pin 24 is hung and stored.

  The manufacturing method of the pneumatic tire of the present invention is manufactured using the tire composite member 1 obtained as described above. That is, the stored tire composite member 1 is attached to the tire molding drum 31 as shown in FIG. At this time, since the thin inner liner layer 2 is in a composite state in which the protective rubber layer 3 and the tie rubber layer 4 are laminated, the handling property due to the thin inner liner layer 2 is not deteriorated.

  After the tire composite member 1 is attached, as shown in FIG. 8, a bead core 34 in which an unvulcanized carcass layer 32, an unvulcanized bead filler 33 are arranged on the outer peripheral side, and an unvulcanized rim, as in the prior art. The cushion rubber layer 35 and the unvulcanized side rubber layer 36 are attached, and a cylindrical first molded body 37 is molded.

  The first molded body 37 is removed from the tire molding drum 31 and attached to the shaping drum 38 as shown in FIG. 9 to apply internal pressure, thereby causing the first molded body 37 to expand in a toroidal shape. A green tire is formed by pressure bonding to the inner peripheral side of an annular second molded body 41 in which an unvulcanized tread rubber layer 40 is bonded to the outer peripheral side of an unvulcanized belt layer 39 disposed on the outer peripheral side of 37. To do. This green tire is pressure-heated and vulcanized in a mold of a tire vulcanizer to obtain a vulcanized pneumatic tire G shown in FIG.

  In the present invention described above, the semi-composite body 10 in which the unvulcanized protective rubber layer 3 is laminated on the outer surface 2A of the inner liner layer 2 is turned upside down by being turned back from one end in the width direction via the roller 11. Therefore, the tire composite member 1 in which the unvulcanized protective rubber layer 3 and the tie rubber layer 4 are laminated on both surfaces of the inner liner layer 2 made of a film of a thermoplastic resin or a thermoplastic elastomer composition is facilitated. It becomes possible to mold easily.

  In the present invention, the storage elastic modulus of the thermoplastic resin or the thermoplastic elastomer composition constituting the inner liner layer 2 can be in the range of 1 to 500 MPa. If the storage elastic modulus is lower than 1 MPa, the strength is insufficient. Conversely, if it exceeds 500 MPa, the toughness is lowered and the durability is deteriorated. The storage elastic modulus here is measured using a viscoelastic spectrometer (manufactured by Toyo Seiki Seisakusho) under the conditions of static strain 10%, dynamic strain ± 2%, frequency 20 Hz, and temperature 20 ° C.

  The thickness of the inner liner layer 2 is preferably in the range of 0.01 to 3 mm. When the thickness is less than 0.01 mm, the air permeation resistance decreases. If the thickness exceeds 3 mm, it is not preferable in terms of weight.

  The modulus at the time of 50% elongation of the rubber constituting the tie rubber layer 4 is preferably in the range of 0.05 to 5 MP. If the modulus at 50% elongation is less than 0.05 MP, the strength is insufficient and handling becomes difficult. If the modulus at 50% elongation exceeds 5 MP, it becomes difficult to control the thickness during rolling. The modulus at 50% elongation referred to here is that the unvulcanized rubber composition is press vulcanized at 100 ° C. for 5 minutes and molded into a sheet having a thickness of 2 mm. It shall be punched into a piece and measured according to JIS K6251 using this test piece.

  The thickness of the tie rubber layer 4 is preferably in the range of 0.2 to 5 mm. If the thickness is less than 0.2 mm, sufficient tack cannot be obtained, and it becomes difficult to ensure good adhesion between the inner liner layer 2 and the carcass layer. If the thickness exceeds 5 mm, it is not preferable in terms of weight. As the rubber used for the tie rubber layer 3, for example, a mixed rubber of natural rubber and ethylene butadiene rubber can be preferably exemplified.

  As the rubber used for the protective rubber layer 3, any rubber may be used as long as it can be protected. For example, butyl rubber can be preferably exemplified. The thickness of the protective rubber layer 3 is not particularly limited as long as it can be protected without causing a significant increase in weight.

  Examples of the thermoplastic resin used for the inner liner layer 2 include polyamide resins [for example, nylon 6 (N6), nylon 66 (N66), nylon 46 (N46), nylon 11 (N11), nylon 12 (N12). , Nylon 610 (N610), nylon 612 (N612), nylon 6/66 copolymer (N6 / 66), nylon 6/66/610 copolymer (N6 / 66/610), nylon MXD6 (MXD6), nylon 6T, nylon 6 / 6T copolymer, nylon 66 / PP copolymer, nylon 66 / PPS copolymer] and their N-alkoxyalkylated products, for example, methoxymethylated products of nylon 6, nylon 6/610 copolymerized Combined methoxymethylated product, nylon 612 methoxymethylated product, polyester resin For example, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene isophthalate (PEI), PET / PEI copolymer, polyarylate (PAR), polybutylene naphthalate (PBN), liquid crystal polyester, polyoxyalkylene diimide Aromatic polyester such as diacid / polybutylene terephthalate copolymer], polynitrile resin [for example, polyacrylonitrile (PAN), polymethacrylonitrile, acrylonitrile / styrene copolymer (AS), (meth) acrylonitrile / styrene copolymer Polymer, (meth) acrylonitrile / styrene / butadiene copolymer], polymethacrylate resin [for example, polymethyl methacrylate (PMMA), polyethyl methacrylate], polyvinyl resin For example, vinyl acetate, polyvinyl alcohol (PVA), vinyl alcohol / ethylene copolymer (EVOH), polyvinylidene chloride (PDVC), polyvinyl chloride (PVC), vinyl chloride / vinylidene chloride copolymer, vinylidene chloride / methyl acrylate Copolymer, vinylidene chloride / acrylonitrile copolymer], cellulose resin [eg, cellulose acetate, cellulose acetate butyrate], fluororesin [eg, polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), polychlorofluoro Ethylene (PCTFE), tetrafluoroethylene / ethylene copolymer], an imide resin [for example, aromatic polyimide (PI)] and the like can be preferably used.

  The thermoplastic elastomer composition can be constituted by mixing an elastomer component with the above-described thermoplastic resin component. Examples of the elastomer used include diene rubbers and hydrogenated products thereof [for example, natural rubber (NR), isoprene rubber (IR), epoxidized natural rubber, styrene bradiene rubber (SBR), bradiene rubber (BR, high Cis BR and low cis BR), nitrile rubber (NBR), hydrogenated NBR, hydrogenated SBR], olefin rubber [eg, ethylene propylene rubber (EPDM, EPM), maleic acid modified ethylene propylene rubber (M-EPM), Butyl rubber (IIR), isobutylene and aromatic vinyl or diene monomer copolymer, acrylic rubber (ACM), ionomer], halogen-containing rubber [for example, Br-IIR, CI-IIR, bromine of isobutylene paramethylstyrene copolymer (Br-IPMS), chloroprene rubber (CR), hydride Rubber (CHR), chlorosulfonated polyethylene rubber (CSM), chlorinated polyethylene rubber (CM), maleic acid-modified chlorinated polyethylene rubber (M-CM)], silicone rubber [eg, methyl vinyl silicone rubber, dimethyl silicone rubber, Methyl phenyl vinyl silicon rubber], sulfur-containing rubber (for example, polysulfide rubber), fluorine rubber (for example, vinylidene fluoride rubber, fluorine-containing vinyl ether rubber, tetrafluoroethylene-propylene rubber, fluorine-containing silicon rubber, fluorine-containing phosphazene Rubbers], thermoplastic elastomers [for example, styrene elastomers, olefin elastomers, ester elastomers, urethane elastomers, polyamide elastomers] and the like can be preferably used.

  The composition ratio of the specific thermoplastic resin component (A) and the elastomer component (B) in the case of blending the thermoplastic resin and the elastomer is not particularly limited, and the film thickness, air permeation resistance, flexibility The weight ratio (A) / (B) is preferably 10/90 to 90/10, and more preferably 20/80 to 85/15.

  In the thermoplastic elastomer composition according to the present invention, in addition to the essential polymer component, another polymer such as a compatibilizer can be mixed as a third component. The purpose of mixing other polymers is to improve the compatibility between the thermoplastic resin and the elastomer component, to improve the molding processability of the material, to improve heat resistance, to reduce costs, etc. Examples of the material used include polyethylene (PE), polypropylene (PP), polystyrene (PS), ABS, SBS, and polycarbonate (PC).

A method for producing a thermoplastic elastomer composition is a method in which a thermoplastic resin component and an elastomer component (unvulcanized product in the case of rubber) are previously melt-kneaded with a twin-screw kneading extruder or the like to form a continuous phase (matrix). By dispersing the elastomer component as a dispersed phase (domain) in the plastic resin. When vulcanizing the elastomer component, a vulcanizing agent may be added under kneading to dynamically vulcanize the elastomer component. Further, various compounding agents (excluding the vulcanizing agent) to the thermoplastic resin or the elastomer component may be added during the kneading, but are preferably mixed in advance before kneading. The kneading machine used for kneading the thermoplastic resin and the elastomer component is not particularly limited, and a screw extruder, a kneader, a Banbury mixer, a biaxial kneading extruder, or the like can be used. Among them, it is preferable to use a twin-screw kneading extruder for kneading the thermoplastic resin and the elastomer component and for dynamic vulcanization of the elastomer component. Further, two or more types of kneaders may be used and kneaded sequentially. As conditions for melt-kneading, the temperature may be equal to or higher than the temperature at which the thermoplastic resin melts. The shear rate during kneading is preferably 2500 to 7500 Sec- ¹ . The entire kneading time is from 30 seconds to 10 minutes, and when a vulcanizing agent is added, the vulcanization time after addition is preferably from 15 seconds to 5 minutes. The thermoplastic elastomer composition produced by the above method is formed into a film by molding with a resin extruder or calendering. The method for forming a film may be a method for forming a film of a normal thermoplastic resin or thermoplastic elastomer.

  The present invention forms a tire composite member 1 in which an unvulcanized protective rubber layer 3 is laminated on an inner surface of an inner liner layer 2 and an unvulcanized tie rubber layer 4 is laminated on an outer surface as in the above-described embodiment. Although it can be preferably used, the present invention is not limited to this, and it is also applicable to molding a tire composite member in which an unvulcanized rubber layer used for other purposes is laminated on both the inner and outer surfaces of the inner liner layer 2. If a tire composite member in which an unvulcanized rubber layer is laminated on both the inner and outer surfaces of a cylindrical inner liner layer 2 made of a film of a thermoplastic resin or a thermoplastic elastomer composition can be used for both. Can do.

1 shows one embodiment of a method for molding a tire composite member of the present invention, (A) is an explanatory view showing a step of forming a long cylindrical film, and (B) is a step of cutting a long cylindrical film. (C) is an explanatory view showing a process of laminating a protective rubber layer, (D) is an explanatory view showing a process of turning over the semi-composite, and (E) is a process of laminating a tie rubber layer on the inverted semi-composite. Explanatory drawing which shows a process, (F) And (G) is explanatory drawing which shows the process of storing the shape | molded tire composite member. It is sectional drawing of the tire composite member obtained with the shaping | molding method of FIG. 1 (B) and 1 (C) show another process, (A) is an explanatory view showing a process of laminating a protective rubber layer, and (B) is a film / rubber laminate molded in (A). It is description which shows the process of cut | disconnecting a body. It is a schematic front explanatory drawing which shows an example of the reversing apparatus used by a reversing process. It is explanatory drawing of the inversion means. (A)-(F) is explanatory drawing which shows the process in which a semi-complex is turned over with the turning-over apparatus of FIG. It is explanatory drawing which shows the process of attaching a tire composite member to a tire molding drum. It is explanatory drawing which shows the process of shape | molding a 1st molded object. It is explanatory drawing which shows the process of shape | molding a green tire by expanding a 1st molded object and crimping | bonding to a 2nd molded object. It is sectional drawing of the obtained vulcanized tire.

Explanation of symbols

1 tire composite member 2 carcass layer 2A outer surface 3 protective rubber layer (first unvulcanized rubber layer)
4 Tie rubber layer (second unvulcanized rubber layer)
6 Long cylindrical film 10 Semi-composite 10 'Inverted semi-composite 10'X Outer surface 11 Roller 52 Film / rubber laminate

Claims (8)

  A method of molding a tire composite member in which an unvulcanized rubber layer is laminated on both inner and outer surfaces of a cylindrical inner liner layer made of a thermoplastic resin or a thermoplastic elastomer composition film in which an elastomer is blended in a thermoplastic resin. After the first unvulcanized rubber layer is laminated on the outer surface of the cylindrical inner liner layer to form a cylindrical semi-composite, the semi-composite is moved while being folded back from one end in the width direction via a roller. Thus, a method for forming a tire composite member, in which the semi-composite is turned upside down and a tire composite member is formed by laminating a second unvulcanized rubber layer on the outer surface of the turned-up half composite.   The method for molding a tire composite member according to claim 1, wherein the half composite is folded back from the outside to the inside.   A long tubular film folded into a sheet is formed, and the folded inner tubular film is cut into a length corresponding to one tire in a state in which the folded tubular film is inflated to form an inner liner layer. 3. A method for molding a tire composite member according to 1 or 2.   A long tubular film folded into a sheet is formed, a first unvulcanized rubber layer is laminated on the outer surface of the folded tubular film to form a film / rubber laminate, and the film / rubber laminate A cylindrical semi-composite in which the first unvulcanized rubber layer is laminated on the outer surface of the inner liner layer by cutting into a length corresponding to one tire in a state where the cylinder is inflated. 3. A method for forming a tire composite member according to 2.   The first unvulcanized rubber layer is a protective rubber layer protecting the inner surface of the inner liner layer, and the second unvulcanized rubber layer is a tie rubber layer disposed for bonding the inner liner layer and the carcass layer. Item 5. A method for molding a tire composite member according to any one of Items 1 to 4.   6. The method for molding a tire composite member according to claim 5, wherein the thickness of the tie rubber layer is 0.2 to 5 mm, and the modulus at the time of 50% elongation of the rubber constituting the tie rubber layer is 0.05 to 5 MPa.   The storage elastic modulus of the thermoplastic resin or the thermoplastic elastomer composition constituting the inner liner layer is 1 to 500 MPa, and the thickness of the inner liner layer is 0.01 to 3 mm. The method for forming a tire composite member according to Item.   8. When forming a green tire in which an unvulcanized rubber layer is laminated on both the inner and outer surfaces of an inner liner layer made of a thermoplastic resin or a thermoplastic elastomer composition film in which an elastomer is blended with a thermoplastic resin. A method for manufacturing a pneumatic tire using the tire composite member formed by the method for forming a tire composite member according to any one of the above.

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