JP5664002B2 - Pneumatic tire manufacturing method and vulcanizing apparatus - Google Patents

Description

  The present invention relates to a pneumatic tire manufacturing method and a vulcanizing apparatus, and more particularly to a pneumatic tire manufacturing method and a vulcanizing apparatus that enable bladderless vulcanization without significantly increasing equipment costs.

  Conventionally, when a pneumatic tire is vulcanized, a green tire is put into a mold of a vulcanizer, and the green tire is vulcanized with a bladder inflated inside the green tire. Thus, a pneumatic tire can be shape | molded in a desired shape by applying a pressure from the tire inner side through a bladder.

  However, in the vulcanization method using a bladder, there is a problem that the cost of the bladder itself, which is a consumable item, is generated. Further, when air remains between the tire and the bladder, or when the bladder is deteriorated and unevenness is formed on the surface, there is a problem that the appearance of the tire inner surface is deteriorated. Furthermore, there is a problem that the inner liner layer is damaged when the bladder is rubbed against the inner surface of the tire during release.

  As a solution to these problems, bladderless vulcanization has been proposed in which vulcanization is performed without using a bladder (see, for example, Patent Document 1). However, in order to perform bladderless vulcanization, it is necessary to sufficiently ensure the sealing performance of the gas filled in the tire. For this purpose, a complicated mechanism for pressing the bead portion of the pneumatic tire against the mold is required. It is necessary to attach to the vulcanizer, resulting in a significant increase in equipment costs. In addition, even if the vulcanizer is provided with a complicated mechanism as described above, it is not always possible to sufficiently ensure the sealing performance of the gas filled in the tire.

JP 2009-208394 A

  An object of the present invention is to provide a pneumatic tire manufacturing method and a vulcanizing apparatus capable of bladderless vulcanization without significantly increasing the equipment cost.

In order to achieve the above object, a method for manufacturing a pneumatic tire according to the present invention includes a mold for forming an outer surface of a pneumatic tire and an inner liner member that is an innermost surface member of the pneumatic tire as a vulcanization bladder. A pair of clamp members; a heating unit that heats the mold; and a pressurizing medium supply unit that supplies a pressurizing medium to the inside of the inner liner member, wherein one clamp member faces the other clamp member. In a state before the pressurizing medium is supplied to the inner side of the inner liner member, the pair of clamp members grip the inner liner member so as to be cylindrical, and the pressurizing medium When supplied to the inside of the inner liner member, the pair of clamp members narrows the mutual distance so that the inner liner member is positioned outside the tire radial direction. A pneumatic tire manufacturing method using the vulcanizing apparatus adapted to grip in a state where not been inflated to,
The inner liner member to be innermost member of a pneumatic tire used as a vulcanization bladder, by performing vulcanization of the green tire in a state of inflating the inner liner member by the pressurizing medium at the inside of the green tire A pneumatic tire in which the inner liner member is integrated on the inner surface is molded, and then an unnecessary portion of the inner liner member protruding from the bead portion of the pneumatic tire is cut off.

The pneumatic tire vulcanizing apparatus of the present invention for achieving the above object includes a mold for molding an outer surface of a pneumatic tire and an inner liner member serving as an innermost surface member of the pneumatic tire by a vulcanizing bladder. A pair of clamp members to be gripped, heating means for heating the mold, and pressure medium supply means for supplying a pressure medium to the inside of the inner liner member , one clamp member being the other clamp member The pair of clamp members grip the inner liner member in a cylindrical shape before the pressurizing medium is supplied to the inner side of the inner liner member, and In a state in which the pressure medium is supplied to the inner side of the inner liner member, the pair of clamp members narrows the mutual distance so that the inner liner member becomes the tire diameter. It is characterized in that the gripping state in which inflated to direction outward.

  In the present invention, the inner liner member of the pneumatic tire is used as a vulcanization bladder, and the inner liner member is integrated with the inner surface by vulcanizing the green tire with the inner liner member inflated inside the green tire. Since the molded pneumatic tire is molded, the sealability of the pressurizing medium filled in the tire is sufficiently ensured, and bladderless vulcanization is enabled. This reduces the cost of bladders that have been conventionally used in vulcanizers as consumables, avoids appearance defects caused by bladders, avoids damage to inner liners caused by bladders, and release agents. Application of can be eliminated. In addition, since the clamp member used for gripping the bladder in the conventional vulcanizing apparatus can be diverted to the grip of the inner liner member with only a slight improvement, the equipment cost is not significantly increased. After vulcanization, unnecessary portions of the inner liner member protruding from the bead portion of the pneumatic tire are removed, so that the inner liner member protruding from the bead portion does not adversely affect the tire performance.

In the present invention, in order to carry out the above-described manufacturing method, a pair of clamps that grip a mold for forming the outer surface of a pneumatic tire and an inner liner member that is an innermost surface member of the pneumatic tire as a vulcanization bladder A member, a heating means for heating the mold, and a pressure medium supply means for supplying a pressure medium to the inside of the inner liner member , wherein one clamp member is configured to be movable forward and backward toward the other clamp member. In a state before the pressure medium is supplied to the inner liner member, the pair of clamp members grips the inner liner member so as to be cylindrical, and the pressure medium is supplied to the inner liner member. use the pair of clamping members vulcanization apparatus adapted to grip the inner liner member by narrowing a mutual spacing in a state of inflating the tire radial direction outside Rukoto is required.

  In the vulcanizing apparatus, it is preferable that an elastic body that contacts the inner liner member is interposed in the clamp member. Thereby, it can prevent that an inner liner member is damaged by the holding | grip of a clamp member. Alternatively, it is preferable that a cover member made of an elastic body that is in contact with the inner liner member and that is in contact with the inner surface of the bead portion of the pneumatic tire is interposed in the clamp member. In this case, in addition to preventing the inner liner member from being damaged by gripping the clamp member, the cover member plays a role of adjusting the shape of the bead portion during vulcanization.

  As a constituent material of the inner liner member, a rubber composition containing butyl rubber as a main component can be used, or a thermoplastic resin or a thermoplastic elastomer composition can be used. In either case, it functions well as a substitute for the vulcanization bladder.

  On the other hand, steam or an inert gas can be used as the pressurizing medium. However, when steam is used as the pressurizing medium, it is preferable to use steam after preliminarily waterproofing the inner surface of the inner liner member in order to more reliably prevent the permeation of the steam.

  The green tire is preferably provided with a plurality of holes penetrating in the thickness direction, and air between the inner liner member and the green tire is discharged through these holes. Thus, by discharging the air between the inner liner member and the green tire, the vulcanization failure can be more reliably reduced.

It is principal part sectional drawing which shows the vulcanization | cure apparatus of the pneumatic tire which consists of embodiment of this invention. The manufacturing method of the pneumatic tire which consists of embodiment of this invention is shown, (a)-(e) is sectional drawing in each process. It is a top view which shows an example of the inner liner member used as a vulcanization bladder in this invention. It is a top view which shows the other example of the inner liner member used as a vulcanization bladder in this invention. It is principal part sectional drawing which shows the vulcanization | cure apparatus of the pneumatic tire which consists of other embodiment of this invention.

  Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a vulcanizing apparatus for a pneumatic tire according to an embodiment of the present invention. As shown in FIG. 1, the vulcanizing apparatus includes a mold 1 that molds the outer surface of the pneumatic tire T, and an upper and lower gripping the inner liner member L that is the innermost surface member of the pneumatic tire T as a vulcanizing bladder. A pair of clamp members 11 and 12, a heating means (not shown) for heating the mold 1, and a pressure medium supply means (not shown) for supplying the pressure medium M to the inside of the inner liner member L are provided. As the heating means and the pressurized medium supply means, those used in a normal vulcanizer can be employed.

  The mold 1 includes a plurality of sectors 2 for forming a tread portion of the pneumatic tire T, a lower side plate 3 and an upper side plate 4 for forming a sidewall portion of the pneumatic tire T, and a bead of the pneumatic tire T. It comprises a lower bead ring 5 and an upper bead ring 6 that form the part.

  The lower clamp member 11 includes a lower bead ring 5 and a lower clamp ring 13. The lower clamp ring 13 is disposed at a position radially inward of the lower bead portion of the pneumatic tire T. The lower clamp ring 13 is configured to be movable in the vertical direction. The outer peripheral end of the lower clamp ring 13 is engaged with the inner peripheral end of the lower bead ring 5, and the lower end portion of the cylindrical inner liner member L is sandwiched in the gap.

  On the other hand, the upper clamp member 12 includes an upper clamp ring 14 and an auxiliary clamp ring 15. The upper clamp ring 14 is disposed above the lower clamp ring 13 and at a position radially inward of the upper bead portion of the pneumatic tire T. The upper clamp ring 14 is configured to be movable in the vertical direction, and the auxiliary clamp ring 15 is configured to be detachable from the upper clamp ring 14. The outer peripheral end of the upper clamp ring 14 is engaged with the inner peripheral end of the auxiliary clamp ring 15, and the upper end portion of the cylindrical inner liner member L is sandwiched in the gap. Further, the outer peripheral end of the auxiliary clamp ring 15 is adapted to engage with the inner peripheral end of the upper bead ring 6.

  2 (a) to 2 (e) show a method for manufacturing a pneumatic tire according to an embodiment of the present invention. First, as shown in FIG. 2A, a cylindrical inner liner member L is attracted and conveyed by a plurality of vacuum cups 16 from the outside in the radial direction, and the inner liner member L is moved to the lower clamp ring 13 and It arrange | positions at the radial direction outer side of the upper clamp ring 14. FIG. In FIG. 2A, the end surface in the longitudinal section of the inner liner member L is shown.

  Next, as shown in FIG. 2 (b), the lower end portion and the upper end portion of the inner liner member L are held by the clamp members 11 and 12, respectively. Thereby, the inner liner member L can be used as a vulcanization bladder. On the other hand, a green tire T ′ is disposed outside the inner liner member L in the radial direction. The green tire T ′ is not provided with an inner liner member. However, when importance is attached to air permeation prevention performance, an inner liner member can be provided in advance on the green tire T ′.

  Next, as shown in FIG. 2 (c), a heated low-pressure medium M is introduced into the inner liner member L, and the inner liner member L is applied inside the green tire T ′ by the pressurized medium M. Inflated. Thereby, shaping of the green tire T ′ is performed. The internal pressure in the shaping process is preferably set in the range of 5 kPa to 50 kPa. In the shaping process, the inner liner member L, which is thinner than the conventional vulcanization bladder, can be flexibly deformed and does not get caught on the bead portion of the green tire T ′ unlike the conventional vulcanization bladder. Air can be effectively discharged from between T ′ and the inner liner member L. It is also possible to provide a plurality of holes penetrating in the thickness direction in the green tire T ′ and discharge air between the inner liner member L and the green tire T ′ through these holes. In this case, the vulcanization failure due to the air remaining between the green tire T ′ and the inner liner member L can be more reliably reduced.

  Next, as shown in FIG. 2 (d), after the mold 1 is closed, the heated high pressure medium M is introduced into the inner liner member L to vulcanize the green tire T '. . The internal pressure in the vulcanization process is preferably set in the range of 1.0 MPa to 2.5 MPa. In the closed mold state, since the mold 1 receives pressure, there is no problem even if the rigidity of the inner liner member L is low. And the pneumatic tire T with which the inner liner member L was integrated by the inner surface is obtained by completing a vulcanization process.

  Next, as shown in FIG. 2E, the inner liner member L is integrated with the inner surface by releasing the mold 1 and releasing the grip of the inner liner member L by the clamp members 11 and 12. The pneumatic tire T is removed from the vulcanizer. Thereafter, unnecessary portions of the inner liner member L protruding from the bead portion of the pneumatic tire T are appropriately cut off. The unnecessary portion of the inner liner member L may be removed while the clamp members 11 and 12 are holding the inner liner member L.

  According to the manufacturing method of the pneumatic tire described above, the green tire T ′ is used with the inner liner member L of the pneumatic tire T used as a vulcanization bladder and the inner liner member L is inflated inside the green tire T ′. Since the pneumatic tire T in which the inner liner member L is integrated on the inner surface is formed by performing vulcanization, sufficient sealing performance of the pressure medium M filled in the green tire T ′ is ensured, and bladderless Vulcanization can be carried out.

  This reduces (1) the cost of bladders that have been used in conventional vulcanizing equipment as consumables, and (2) avoids the appearance defects caused by bladders, but rather smoothes the tire inner surface And (3) avoiding damage to the inner liner due to the bladder, and (4) eliminating the need for applying a release agent for promoting peeling between the bladder and the tire.

  Moreover, since the clamp members 11 and 12 can be configured by slightly improving the clamp member used for gripping the bladder in the conventional vulcanizing apparatus, it is accompanied by a significant increase in equipment cost. Absent.

  As a constituent material of the inner liner member L, a rubber composition containing butyl rubber as a main component can be used. When using the inner liner member L made of such a rubber composition, the inner liner member L may be in an unvulcanized state or may be vulcanized. Moreover, as a constituent material of the inner liner member L, a thermoplastic resin or a thermoplastic elastomer composition can be used.

  3 and 4 show a state in which the inner liner member L used as a vulcanization bladder is held in a cylindrical shape. In FIG. 3, the sheet-like inner liner member L is wound in a cylindrical shape. In this case, it is preferable to wind the sheet-like inner liner member L twice in order to prevent a defect due to the opening of the joining portion. In FIG. 4, the inner liner member L is a molded product extruded into a cylindrical shape.

  As the pressurized medium M, steam can be used. In this case, in order to more reliably prevent the permeation of steam, it is preferable to apply a waterproof treatment to the inner surface of the inner liner member L beforehand. As the waterproof treatment, for example, a waterproof treatment agent such as silicone oil may be applied to the inner surface of the inner liner member L by spraying. Further, as the pressurizing medium M, an inert gas such as nitrogen gas can be used. In the case of an inert gas, waterproofing is not necessary.

  FIG. 5 shows a vulcanizing apparatus for a pneumatic tire according to another embodiment of the present invention. 5, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, the vulcanizing apparatus includes a mold 1 that molds the outer surface of the pneumatic tire T, and a pair of upper and lower clamp members 21 that grip the inner liner member L of the pneumatic tire T as a vulcanizing bladder. , 22, heating means (not shown) for heating the mold 1, and pressure medium supply means (not shown) for supplying the pressurized heat medium M to the inside of the inner liner member L.

  The lower clamp member 21 includes a lower bead ring 5, a lower clamp ring 23, an auxiliary clamp ring 24, and a cover member 25. The lower clamp ring 23 is disposed at a position radially inward of the lower bead portion of the pneumatic tire T. Between the lower clamp ring 23 and the lower bead ring 5, a cover member 25 made of an annular elastic body extending to a position where the lower bead portion of the pneumatic tire T is pressed is sandwiched. The auxiliary clamp ring 24 is configured to be detachable from the lower clamp ring 23. The lower end portion of the cylindrical inner liner member L is sandwiched between the auxiliary clamp ring 24 and the cover member 25. That is, in the lower clamp member 21, the cover member 25 made of an elastic body is provided so as to contact the inner liner member L and contact the inner surface of the bead portion of the pneumatic tire T.

  On the other hand, the upper clamp member 22 includes an upper clamp ring 26, two auxiliary clamp rings 27 and 28, and a cover member 29. The upper clamp ring 26 is disposed above the lower clamp ring 23 and at a position radially inward of the upper bead portion of the pneumatic tire T. The auxiliary clamp rings 27 and 28 are configured to be detachable from the upper clamp ring 26, respectively. Between the upper clamp ring 26 and the auxiliary clamp ring 27, a cover member 29 made of an annular elastic body extending to a position where the upper bead portion of the pneumatic tire T is pressed is sandwiched. The outer peripheral end of the auxiliary clamp ring 27 is adapted to engage with the inner peripheral end of the upper bead ring 6. The upper end portion of the cylindrical inner liner member L is sandwiched between the auxiliary clamp ring 28 and the cover member 29. That is, in the upper clamp member 22, the cover member 29 made of an elastic body is provided so as to contact the inner liner member L and to contact the inner surface of the bead portion of the pneumatic tire T.

  In the vulcanizing apparatus configured as described above, the lower clamp member 21 sandwiches the lower end portion of the inner liner member L between the auxiliary clamp ring 24 and the cover member 25, and the upper clamp member 22 uses the auxiliary clamp ring. By sandwiching the upper end portion of the inner liner member L between the cover 28 and the cover member 29, the inner liner member L can be used as a vulcanization bladder. After vulcanization, the auxiliary clamp ring 24 is released from the lower clamp ring 23 and the auxiliary clamp ring 28 is released from the upper clamp ring 26 to release the grip of the inner liner member L by the clamp members 21 and 22.

  In this way, when the cover members 25 and 29 made of an elastic body that contacts the inner liner member L are interposed in the clamp members 21 and 22, stress concentration on the inner liner member L is avoided, and the clamp members 21 and 22 are gripped. Thus, the inner liner member L can be prevented from being damaged. Further, since the cover members 25 and 29 are also in contact with the inner surface of the bead portion of the green tire T ′, the cover members 25 and 29 play a role of adjusting the shape of the bead portion during vulcanization. That is, the inner liner member L used as a vulcanization bladder is sufficient in terms of ensuring sealing properties, but the function of adjusting the shape of the bead portion is not necessarily sufficient. Therefore, in order to shape the bead portion and shape the bead toe into a sharp shape, cover members 25 and 29 are provided.

  Even if the bead toe is rounded in the obtained pneumatic tire T, it is not necessarily inferior in performance, so that it is not always necessary to adjust the shape of the bead part by the cover members 25 and 29. Further, if the extrusion shape of the rubber member around the bead portion is devised and the shape of the bead portion is adjusted in the state of the green tire T ′, it is not always necessary to adjust the shape of the bead portion in the vulcanization process.

  Hereinafter, the thermoplastic resin or the thermoplastic elastomer composition used as a constituent member of the inner liner member will be described. This inner liner member can be composed of a thermoplastic resin or a thermoplastic elastomer composition obtained by blending an elastomer in a thermoplastic resin.

  Examples of the thermoplastic resin used in the present invention 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, nylon 6T, nylon 6 / 6T copolymer, nylon 66 / PP copolymer, nylon 66 / PPS copolymer], polyester resin [for example, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene isophthalate (PEI), polybutylene terephthalate / Tetramethylene glycol copolymer, PET PEI copolymer, polyarylate (PAR), polybutylene naphthalate (PBN), liquid crystal polyester, aromatic polyester such as polyoxyalkylene diimide diacid / polybutylene terephthalate copolymer], polynitrile resin [for example, polyacrylonitrile ( PAN), polymethacrylonitrile, acrylonitrile / styrene copolymer (AS), methacrylonitrile / styrene copolymer, methacrylonitrile / styrene / butadiene copolymer], poly (meth) acrylate resin [eg polymethacryl Acid methyl (PMMA), polyethyl methacrylate, ethylene ethyl acrylate copolymer (EEA), ethylene acrylic acid copolymer (EAA), ethylene methyl acrylate resin (EMA)], polyvinyl resin [for example, vinyl acetate (EVA), polyvinyl alcohol (PVA), vinyl alcohol / ethylene copolymer (EVOH), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC), vinyl chloride / vinylidene chloride copolymer, vinylidene chloride / methyl acrylate Copolymer], cellulose resin [eg, cellulose acetate, cellulose acetate butyrate], fluorine resin [eg, polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), polychlorofluoroethylene (PCTFE), tetrafluoroethylene / ethylene Copolymer (ETFE)], imide resin [for example, aromatic polyimide (PI)] and the like.

  Examples of the elastomer used in the present invention include diene rubbers and hydrogenated products thereof [for example, NR, IR, epoxidized natural rubber, SBR, BR (high cis BR and low cis BR), 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, Cl-IIR, brominated product of isobutylene paramethylstyrene copolymer (Br-IPMS), chloroprene rubber (CR), hydrin rubber (CHC, CHR), Chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), maleic acid-modified chlorinated polyethylene (M-CM)], silicone rubber (eg, methyl vinyl silicone rubber, dimethyl silicone rubber, methyl phenyl vinyl silicone rubber), sulfur-containing rubber (eg, polysulfide rubber), fluoro rubber (eg, Vinylidene fluoride rubber, fluorine-containing vinyl ether rubber, tetrafluoroethylene-propylene rubber, fluorine-containing silicone rubber, fluorine-containing phosphazene rubber), thermoplastic elastomer (eg, styrene elastomer, olefin elastomer, polyester elastomer, And urethane elastomers and polyamide elastomers).

  In the thermoplastic elastomer composition used in the present invention, the composition ratio of the thermoplastic resin component (A) and the elastomer component (B) may be appropriately determined depending on the balance of film thickness and flexibility, but the preferred range is 10/90 to 90/10, more preferably 20/80 to 85/15 (weight ratio).

  In the thermoplastic elastomer composition according to the present invention, in addition to the essential components (A) and (B), as a third component, other polymers such as a compatibilizer and a compounding agent can be mixed. The purpose of mixing other polymers is to improve the compatibility between the thermoplastic resin component and the elastomer component, to improve the film molding processability of the material, to improve heat resistance, to reduce costs, etc. Examples of the material used for this include polyethylene, polypropylene, polystyrene, ABS, SBS, and polycarbonate.

The thermoplastic elastomer composition is prepared by melt-kneading a thermoplastic resin and an elastomer (unvulcanized material in the case of rubber) in advance using a twin-screw kneading extruder or the like, and adding an elastomer component in the thermoplastic resin forming a continuous phase. It is obtained by dispersing. When the elastomer component is vulcanized, a vulcanizing agent may be added under kneading to dynamically vulcanize the elastomer. 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 is not particularly limited, and examples thereof include a screw extruder, a kneader, a Banbury mixer, and a biaxial kneading extruder. Among these, it is preferable to use a twin-screw kneading extruder for kneading the resin component and the rubber component and for dynamic vulcanization of the rubber component. Further, two or more types of kneaders may be used and kneaded sequentially. As conditions for melt-kneading, the temperature may be 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 calender molding. The method for forming a film may be a method of forming a film of a normal thermoplastic resin or thermoplastic elastomer.

  The thin film of the thermoplastic elastomer composition thus obtained has a structure in which the elastomer is dispersed as a discontinuous phase in a thermoplastic resin matrix. By adopting the dispersion structure in such a state, it is possible to set the Young's modulus in a range of 1 to 500 MPa and to impart appropriate rigidity as a tire constituent member.

  The thermoplastic resin or thermoplastic elastomer composition can be molded into a sheet or film and used alone as a tire component, but an adhesive layer is laminated in order to improve the adhesion to adjacent rubber. Also good. Specific examples of the adhesive polymer constituting the adhesive layer include ultrahigh molecular weight polyethylene (UHMWPE), ethylene ethyl acrylate copolymer (EEA), ethylene methyl acrylate resin (EMA) having a molecular weight of 1 million or more, preferably 3 million or more. ), Acrylate copolymers such as ethylene acrylic acid copolymer (EAA) and their maleic anhydride adducts, polypropylene (PP) and its maleic acid modification, ethylene propylene copolymer and its maleic acid modification, Polybutadiene resin and its modified maleic anhydride, styrene-butadiene-styrene copolymer (SBS), styrene-ethylene-butadiene-styrene copolymer (SEBS), fluorine thermoplastic resin, polyester thermoplastic resin, etc. Can be mentioned. These can be extruded into a sheet form or a film form by a conventional method, for example, using a resin extruder. The thickness of the adhesive layer is not particularly limited, but it is preferable that the thickness is small for weight reduction of the tire, and 5 μm to 150 μm is preferable.

1 Mold 11, 21 Lower clamp member 12, 22 Upper clamp member 25, 29 Cover member L Inner liner member M Pressurizing medium T Pneumatic tire T 'Green tire

Claims (11)

A mold for molding the outer surface of the pneumatic tire; a pair of clamp members for gripping an inner liner member as an innermost surface member of the pneumatic tire as a vulcanization bladder; a heating means for heating the mold; and the inner A pressure medium supply means for supplying a pressure medium to the inside of the liner member, wherein one clamp member is configured to be movable forward and backward toward the other clamp member, and the pressure medium is disposed inside the inner liner member. In a state before being supplied, the pair of clamp members grips the inner liner member so as to be cylindrical, and in a state where the pressurizing medium is supplied to the inside of the inner liner member, the pair of clamp members is Pneumatic inflow using a vulcanizer that narrows the mutual spacing and grips the inner liner member in an expanded state in the tire radial direction. A method of manufacturing a tire,
The inner liner member to be innermost member of a pneumatic tire used as a vulcanization bladder, by performing vulcanization of the green tire in a state of inflating the inner liner member by the pressurizing medium at the inside of the green tire A pneumatic tire in which the inner liner member is integrated on an inner surface, and then an unnecessary portion of the inner liner member protruding from a bead portion of the pneumatic tire is cut off. Production method. The method of manufacturing a pneumatic tire according to claim 1, characterized in that is interposed in contact with the elastic member to the inner liner member to said clamping member. 2. The pneumatic tire manufacturing method according to claim 1 , wherein a cover member made of an elastic body that abuts against the inner liner member and abuts against an inner surface of a bead portion of the pneumatic tire is interposed in the clamp member. Method. The method for producing a pneumatic tire according to any one of claims 1 to 3 , wherein a rubber composition containing butyl rubber as a main component is used as a constituent material of the inner liner member. The method for producing a pneumatic tire according to any one of claims 1 to 3 , wherein a thermoplastic resin or a thermoplastic elastomer composition is used as a constituent material of the inner liner member. The method for manufacturing a pneumatic tire according to any one of claims 1 to 5 , wherein steam is used as the pressure medium after the inner surface of the inner liner member is waterproofed in advance. The method of manufacturing a pneumatic tire according to any one of claims 1 to 5, characterized in that an inert gas as the pressurizing medium. Any the green tire a plurality of holes penetrating in its thickness direction provided, according to claim 1-7, characterized in that for discharging the air between the green tire and the inner liner member through these holes A method for producing a pneumatic tire according to claim 1. A mold for molding the outer surface of the pneumatic tire; a pair of clamp members for gripping an inner liner member as an innermost surface member of the pneumatic tire as a vulcanization bladder; a heating means for heating the mold; and the inner A pressure medium supply means for supplying a pressure medium to the inside of the liner member , wherein one clamp member is configured to be movable forward and backward toward the other clamp member, and the pressure medium is disposed inside the inner liner member. In a state before being supplied, the pair of clamp members grips the inner liner member so as to be cylindrical, and in a state where the pressurizing medium is supplied to the inside of the inner liner member, the pair of clamp members is by narrowing the spacing between the pneumatic tire characterized by gripping the inner liner member in a state of inflating the tire radial direction outside Vulcanization equipment. The pneumatic tire vulcanizing apparatus according to claim 9 , wherein an elastic body that contacts the inner liner member is interposed in the clamp member. 10. The pneumatic tire according to claim 9 , wherein a cover member made of an elastic body that abuts against the inner liner member and abuts against an inner surface of the bead portion of the pneumatic tire is interposed in the clamp member. Sulfur equipment.

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