JP5664003B2 - Pneumatic tire manufacturing method and vulcanizing apparatus - Google Patents

Description

  The present invention relates to a method for manufacturing a pneumatic tire and a vulcanizing device, and more specifically, in manufacturing a pneumatic tire using a shaping unit that is detachable from the vulcanizing device, the vulcanizing device disposed in the shaping unit. The present invention relates to a method for manufacturing a pneumatic tire and a vulcanizing apparatus that can eliminate inconvenience caused by a sulfur bladder.

  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 manufacturing method of the pneumatic tire described above, when the center of the green tire conveying device and the mold are misaligned or the parallelism is deviated, or the green tire conveyed from the molding process without the shape holding mechanism is deformed. The positioning accuracy of the green tire in the mold is deteriorated.

  Therefore, using a shaping unit that is detachable from the vulcanizer and has a pair of clamp members that hold the vulcanization bladder in a cylindrical shape, the green tire can be accurately attached to the shaping unit outside the vulcanizer. Assembling has been proposed (see, for example, Patent Document 1). In other words, the shaping unit and the green tire are integrated with the bladder inflated inside the green tire outside the vulcanizing device, and the shaping unit is incorporated into the vulcanizing device together with the green tire to mold the green tire. It is arranged inside and the green tire is vulcanized in the mold. In this case, the green tire can be accurately assembled to the shaping unit outside the vulcanizing apparatus, and the green tire is not deformed during transportation.

  However, the shaping unit including the vulcanization bladder has the following various problems due to the vulcanization bladder. That is, when the bladder grows with repeated use, it becomes difficult to insert the bladder into the green tire. Therefore, the bladder can be inserted into the green tire while being deflated by the vacuum, but in this case, the life of the bladder is shortened due to excessive deformation. On the other hand, if the bladder dimensions are reduced to facilitate insertion, poor contact occurs between the bladder and the green tire, and poor vulcanization tends to occur.

  In addition, since the bladder is a consumable item, the cost of the bladder itself occurs. When air remains between the green tire and the bladder, or when the bladder is deteriorated and unevenness is formed on the surface, the appearance of the tire inner surface is deteriorated. If the bladder is rubbed against the tire inner surface during release, the inner liner layer is damaged. Furthermore, in order to promote peeling between the bladder and the green tire, a lubrication treatment or a mold release treatment is required.

JP 2007-98803 A

  The object of the present invention is to eliminate the disadvantages caused by the vulcanization bladder disposed in the shaping unit when manufacturing the pneumatic tire using the shaping unit that is detachable from the vulcanizing apparatus. It is providing the manufacturing method and vulcanization | cure apparatus of a pneumatic tire.

In order to achieve the above object, a manufacturing method of a pneumatic tire according to the present invention includes a shaping unit including a pair of clamp members that grip an inner liner member that is an innermost surface member of the pneumatic tire, and an outer surface of the pneumatic tire. A mold for molding the shaping unit, a shaping unit receiving portion for receiving the shaping unit so that its central axis coincides with the central axis of the mold, heating means for heating the mold, and the inner through the shaping unit. 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 grip the inner liner member so as to be cylindrical. In the state where the pressurizing medium is supplied to the inner side of the inner liner member, the pair of clamp members is held in a state in which the inner liner member is held in a state where the inner liner member is expanded outward in the tire radial direction with the mutual interval narrowed. A method of manufacturing a pneumatic tire using a sulfur apparatus,
Said integrating the said green tire and said shaping unit by inflating the inner liner member by the pressurizing medium inside the precast green tire outside the vulcanizer, the said shaping unit together with the green tire A green tire in which the inner liner member is integrated on the inner surface is formed by placing the green tire in a mold and vulcanizing the green tire in the mold. Then, after that, unnecessary portions of the inner liner member protruding from the bead portion of the pneumatic tire are cut off.

The pneumatic tire manufacturing method of the present invention for achieving the above object includes a shaping unit including a pair of clamp members for gripping an inner liner member which is an innermost surface member of the pneumatic tire, and a pneumatic tire. Through a mold for forming an outer surface, a shaping unit receiving part for receiving the shaping unit so that its central axis coincides with the central axis of the mold, heating means for heating the mold, and the shaping unit 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 back and forth toward the other clamp member, and the pressure medium is the inner liner member of the inner liner member. In a state before being supplied to the inside, the pair of clamp members form the inner liner member in a cylindrical shape. And the pair of clamp members narrows each other so that the inner liner member is inflated outward in the tire radial direction in a state where the pressure medium is supplied to the inner side of the inner liner member. A method of manufacturing a pneumatic tire using the vulcanizing apparatus,
Wherein in the state inflated the inner liner member by the pressurizing medium outside the vulcanizer molding the green tire on the outside of the inner liner member, the shaping unit inside the vulcanizer, together with the green tire Incorporating and placing the green tire in a mold, and vulcanizing the green tire in the mold to form a pneumatic tire in which the inner liner member is integrated on the inner surface. An unnecessary portion of the inner liner member protruding from the bead portion of the pneumatic tire is cut off.

Furthermore, the vulcanizing apparatus for a pneumatic tire according to the present invention for achieving the above object includes a shaping unit including a pair of clamp members for gripping an inner liner member serving as an innermost surface member of the pneumatic tire, and a pneumatic tire. A mold for molding the outer surface of the mold, a shaping unit receiving portion for receiving the shaping unit so that its central axis coincides with the central axis of the mold, heating means for heating the mold, and the shaping unit A pressure medium supply means for supplying a pressure medium to the inside of the inner liner member through the clamp member, wherein one clamp member is configured to be movable forward and backward toward the other clamp member, and the pressure medium is the inner liner member. In a state before being supplied inside, the pair of clamp members form the inner liner member in a cylindrical shape. Grasped, said is in the state of being supplied to the inside of the pressurizing medium said inner liner member for gripping in a state in which the pair of clamping members are inflated the inner liner member to narrow the mutual spacing to the outer side in the tire radial direction It is a feature.

  In the present invention, a shaping unit including a pair of clamp members for gripping an inner liner member of a pneumatic tire in a cylindrical shape is used, and the inner liner member is inflated outside the vulcanizing apparatus, and the shaping unit and the green tire The inner liner member is integrated with the inner surface by incorporating the shaping unit with the green tire into the vulcanizer and placing the green tire in the mold and vulcanizing the green tire in this state. Mold a pneumatic tire. That is, since the inner liner member of a pneumatic tire is used as a vulcanization bladder and a new inner liner member is used for each vulcanization, a pneumatic tire is manufactured using a shaping unit that is detachable from the vulcanizer. In doing so, inconvenience caused by the vulcanization bladder disposed in the shaping unit can be eliminated. 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 shaping unit including a pair of clamp members that grip an inner liner member that is an innermost surface member of the pneumatic tire, and an outer surface of the pneumatic tire are molded. A mold, a shaping unit receiving portion for receiving the shaping unit so that its central axis coincides with the central axis of the mold, a heating means for heating the mold, and a pressure medium inside the inner liner member through the shaping unit And a pair of clamps in a state before the pressure medium is supplied to the inside of the inner liner member. The member grips the inner liner member so as to be cylindrical, and the pressurizing medium is provided inside the inner liner member. By the state it is necessary to use a vulcanizing apparatus adapted to grip in a state where the pair of clamping members are inflated inner liner member by narrowing a mutual spacing to the outer side in the tire radial direction.

  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)-(b) is sectional drawing in a shaping process. The manufacturing method of the pneumatic tire which consists of embodiment of this invention is shown, (a)-(b) is sectional drawing in a formation process. The manufacturing method of the pneumatic tire which consists of embodiment of this invention is shown, (a)-(c) is sectional drawing in a vulcanization 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, this vulcanizing apparatus includes a pair of molds 1 that form an outer surface of a pneumatic tire T and an inner liner member L that is an innermost member of the pneumatic tire T in a cylindrical shape. A shaping unit 10 having clamp members 11 and 12, a shaping unit receiving portion 10X for receiving the shaping unit 10 so that its central axis coincides with the central axis of the mold 1, and a heating unit (not shown) Heating means and a pressure medium supply means (not shown) for supplying the pressure medium M to the inside of the inner liner member L through the shaping unit 10 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 shaping unit 10 is detachable from the vulcanizing device, and is incorporated into the shaping unit receiving portion 10X at the time of vulcanization. In the shaping unit 10, the lower clamp member 11 includes a lower clamp ring 13 and an auxiliary clamp ring 14. The lower clamp ring 13 is arranged at a position radially inward of the lower bead portion of the pneumatic tire T in the assembled state in the shaping unit receiving portion 10X. The lower clamp ring 13 is configured to be movable in the vertical direction. The auxiliary clamp ring 14 is configured to be detachable from the lower clamp ring 13. The outer peripheral end of the lower clamp ring 13 is engaged with the inner peripheral end of the auxiliary clamp ring 14, and the upper end portion of the cylindrical inner liner member L is sandwiched between the gaps. Further, the outer peripheral end of the auxiliary clamp ring 14 is engaged with the inner peripheral end of the lower bead ring 5.

  On the other hand, the upper clamp member 12 includes an upper clamp ring 15 and an auxiliary clamp ring 16. In an assembled state in the shaping unit receiving portion 10X, the upper clamp ring 15 is arranged above the lower clamp ring 13 and at a position radially inward from the upper bead portion of the pneumatic tire T. Yes. The upper clamp ring 15 is configured to be movable in the vertical direction. The auxiliary clamp ring 16 is configured to be detachable from the upper clamp ring 15. The outer peripheral end of the upper clamp ring 15 is engaged with the inner peripheral end of the auxiliary clamp ring 16, 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 16 is engaged with the inner peripheral end of the upper bead ring 6.

  2 (a) to 2 (b), 3 (a) to 3 (b), and 4 (a) to 4 (c) show a method for manufacturing a pneumatic tire according to an embodiment of the present invention. FIGS. 2A and 2B show a case where the molded green tire T ′ is shaped on the shaping unit 10, and FIGS. 3A and 3B show that the green tire T ′ is shaped on the shaping unit 10. These are alternative implementations.

  When shaping the molded green tire T ′ on the shaping unit 10, first, as shown in FIG. 2 (a), a shaping unit 10 in which the inner liner member L of the pneumatic tire T is mounted in a cylindrical shape is prepared. The molded green tire T ′ is disposed outside the inner liner member L outside the vulcanizing apparatus. The green tire T ′ does not include 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 (b), the low pressure medium M was introduced inside the inner liner member L, and the inner liner member L was inflated by the pressure medium M inside the green tire T ′. Put it in a state. 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 strongly press the bead portion of the green tire T ′ unlike the conventional vulcanization bladder. Air can be effectively discharged from between the green tire 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.

  On the other hand, when the green tire T ′ is molded on the shaping unit 10, first, as shown in FIG. 3A, a shaping unit 10 in which the inner liner member L of the pneumatic tire T is mounted in a cylindrical shape is prepared. Outside the vulcanizer, tire constituent members including a cylindrical carcass assembly T1, a pair of annular bead assemblies T2, and a cylindrical belt tread assembly T3 are sequentially arranged outside the inner liner member L. More specifically, a pair of annular bead support members 17 and 18 are mounted on the outer peripheral side of the pair of clamp members 11 and 12 of the shaping unit 10, and the carcass assembly is mounted on the outer periphery of the bead support members 17 and 18. T1 and a pair of bead assemblies T2 are disposed. A belt tread assembly T3 is disposed on the outer peripheral side of the carcass assembly T1.

  Then, as shown in FIG. 3B, the inner liner member L is expanded by the pressurizing medium M, the carcass assembly T1 is expanded into a toroidal shape, and the carcass assembly T1 is bonded to the belt tread assembly T3. Thereafter, the carcass assembly T1 is folded back around the bead assembly T2, or the inner liner member L is expanded by the pressurizing medium M to expand the carcass assembly T1 into a toroidal shape, and then the carcass assembly T1 is assembled to the bead assembly. The green tire T ′ is formed on the outer side of the inner liner member L by folding around the solid T2 and further bonding the carcass assembly T1 to the belt tread assembly T3. This tire molding process also serves as a shaping process. The green tire T ′ is not provided with an inner liner member. However, when importance is attached to the air permeation prevention performance, the green tire T ′ may be provided with an inner liner member in advance. Since the green tire T ′ is supported on the inner liner member L based on the pressure of the pressurizing medium M after the green tire T ′ is formed, the bead support members 17 and 18 can be removed from the shaping unit 10. it can.

  After shaping the molded green tire T ′ on the shaping unit 10 as described above, or after shaping the green tire T ′ on the shaping unit 10, as shown in FIG. 4A, the shaping unit 10 The green tire T ′ is placed in the mold 1 together with the green tire T ′.

  Next, as shown in FIG. 4B, after the mold 1 is closed, a high-pressure medium M heated is introduced into the inner liner member L, and the green tire T ′ is vulcanized. . 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. 4C, 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 method for manufacturing a pneumatic tire described above, the shaping unit 10 including the pair of clamp members 11 and 12 that grip the inner liner member L of the pneumatic tire T in a cylindrical shape is used, and outside the vulcanizing apparatus. The shaping unit 10 and the green tire T ′ are integrated with the inner liner member L inflated, and the shaping unit 10 and the green tire T ′ are incorporated into the vulcanizing device so that the green tire T ′ is placed in the mold 1. It arrange | positions and the pneumatic tire T with which the inner liner member L was integrated by the inner surface is shape | molded by vulcanizing green tire T 'in the state. That is, the inner liner member L of the pneumatic tire T is used as a vulcanization bladder, and a new inner liner member L is used for each vulcanization. Therefore, when manufacturing the pneumatic tire T using the shaping unit 10 that is detachable from the vulcanizing apparatus, it is possible to eliminate inconvenience due to the vulcanization bladder disposed in the shaping unit 10. More specifically, the following effects can be obtained.

(1) Since the new inner liner member L is used as a vulcanization bladder for each vulcanization, the adverse effects caused by the growth of the bladder with repeated use are eliminated.
(2) By making the outer diameter of the inner liner member L smaller than the inner diameter of the bead portion of the green tire T ′, the operation of inserting the inner liner member L into the green tire T ′ as a vulcanizing bladder is facilitated.
(3) Since the inner liner member L is thinner than the conventional vulcanization bladder, the inner liner member L can easily hit the inner surface of the green tire T ′ uniformly.
(4) It is possible to reduce the cost of a vulcanization bladder that has been conventionally used as a consumable.
(5) The appearance failure caused by the vulcanization bladder can be avoided, and the appearance can be improved by smoothing the tire inner surface.
(6) It is possible to avoid damage to the inner liner due to the vulcanization bladder.
(7) It becomes unnecessary to apply a lubricant or a release agent for promoting the peeling between the vulcanization bladder and the tire.

  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.

  5 and 6 each show a state where an inner liner member L used as a vulcanizing bladder is gripped in a cylindrical shape. In FIG. 5, 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. 6, 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. 7 shows a vulcanizing apparatus for a pneumatic tire according to another embodiment of the present invention. 7, 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. 7, the vulcanizer includes a mold 1 that molds the outer surface of the pneumatic tire T, and a pair of cylinders that grip the inner liner member L that is the innermost surface member of the pneumatic tire T. A shaping unit 10 having clamp members 11 and 12, a shaping unit receiving portion 10X for receiving the shaping unit 10 so that its central axis coincides with the central axis of the mold 1, and a heating unit (not shown) Heating means and a pressure medium supply means (not shown) for supplying the pressure medium M to the inside of the inner liner member L through the shaping unit 10 are provided.

  In the lower clamp member 11, a cover member 19 made of an annular elastic body extending between the lower clamp ring 13 and the auxiliary clamp ring 14 to a position where the lower bead portion of the pneumatic tire T is pressed. Is sandwiched. The cover member 19 is fixed to the auxiliary clamp ring 14. The lower end portion of the cylindrical inner liner member L is sandwiched between the lower clamp ring 13 and the cover member 19. That is, in the lower clamp member 11, the cover member 19 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, in the upper clamp member 12, a cover member 20 made of an annular elastic body extending to a position for pressing the upper bead portion of the pneumatic tire T between the lower clamp ring 15 and the auxiliary clamp ring 16. Is sandwiched. The cover member 20 is fixed to the auxiliary clamp ring 16. The upper end portion of the cylindrical inner liner member L is sandwiched between the upper clamp ring 15 and the cover member 20. That is, in the upper clamp member 12, the cover member 20 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 11 sandwiches the lower end portion of the inner liner member L between the lower clamp ring 13 and the cover member 19, and the upper clamp member 12 upper clamp By sandwiching the upper end portion of the inner liner member L between the ring 15 and the cover member 20, the inner liner member L can be used as a vulcanization bladder. After vulcanization, the auxiliary clamp ring 14 is detached from the lower clamp ring 13 together with the cover member 19, and the auxiliary clamp ring 16 is separated from the upper clamp ring 15 together with the cover member 20, whereby the inner liner by the clamp members 21, 22 is obtained. The gripping of the member L is released.

  Thus, when the cover members 19 and 20 made of an elastic body abutting against the inner liner member L are interposed in the clamp members 11 and 12, stress concentration on the inner liner member L is avoided, and the clamp members 11 and 12 are gripped. Thus, the inner liner member L can be prevented from being damaged. Moreover, since the cover members 19 and 20 also contact the inner surface of the bead portion of the green tire T ', the cover members 19 and 20 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, the cover members 19 and 20 are attached in order to shape the bead portion and shape the bead toe into a sharp shape.

  Even if the bead toe is rounded in the obtained pneumatic tire T, it is not necessarily inferior in performance. Therefore, it is not always necessary to adjust the shape of the bead portion by the cover members 19 and 20. 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.

DESCRIPTION OF SYMBOLS 1 Mold 10 Shaping unit 10X Shaping unit receiving part 11 Lower clamp member 12 Upper clamp member 19,20 Cover member L Inner liner member M Pressure medium T Pneumatic tire T 'Green tire

Claims (12)

A shaping unit having a pair of clamp members for gripping an inner liner member serving as an innermost surface member of a pneumatic tire, a mold for molding the outer surface of the pneumatic tire, and the shaping unit having the central axis as the mold A shaping unit receiving portion that receives the central unit so as to coincide with the central axis of the sheet, a heating unit that heats the mold, and a pressurized medium supply unit that supplies a pressurized medium to the inside of the inner liner member through the shaping unit. One clamp member is configured to be able to move forward and backward toward the other clamp member, and the pair of clamp members includes the inner liner member in a state before the pressure medium is supplied to the inner side of the inner liner member. The pressure medium is gripped so as to be cylindrical, and the pressure medium is supplied to the inner side of the inner liner member. In the state A method of manufacturing a pneumatic tire using the vulcanizing apparatus adapted to grip in a state where the pair of clamping members are inflated the inner liner member to narrow the mutual spacing to the outer side in the tire radial direction,
Said integrating the said green tire and said shaping unit by inflating the inner liner member by the pressurizing medium inside the precast green tire outside the vulcanizer, the said shaping unit together with the green tire A green tire in which the inner liner member is integrated on the inner surface is formed by placing the green tire in a mold and vulcanizing the green tire in the mold. And after that, the unnecessary part of the said inner liner member protruded from the bead part of the said pneumatic tire is excised, The manufacturing method of the pneumatic tire characterized by the above-mentioned. A shaping unit having a pair of clamp members for gripping an inner liner member serving as an innermost surface member of a pneumatic tire, a mold for molding the outer surface of the pneumatic tire, and the shaping unit having the central axis as the mold A shaping unit receiving portion that receives the central unit so as to coincide with the central axis of the sheet, a heating unit that heats the mold, and a pressurized medium supply unit that supplies a pressurized medium to the inside of the inner liner member through the shaping unit. One clamp member is configured to be able to move forward and backward toward the other clamp member, and the pair of clamp members includes the inner liner member in a state before the pressure medium is supplied to the inner side of the inner liner member. The pressure medium is gripped so as to be cylindrical, and the pressure medium is supplied to the inner side of the inner liner member. In the state A method of manufacturing a pneumatic tire using the vulcanizing apparatus adapted to grip in a state where the pair of clamping members are inflated the inner liner member to narrow the mutual spacing to the outer side in the tire radial direction,
Wherein in the state inflated the inner liner member by the pressurizing medium outside the vulcanizer molding the green tire on the outside of the inner liner member, the shaping unit inside the vulcanizer, together with the green tire Incorporating and placing the green tire in a mold, and vulcanizing the green tire in the mold to form a pneumatic tire in which the inner liner member is integrated on the inner surface. A method for manufacturing a pneumatic tire, comprising cutting off an unnecessary portion of the inner liner member protruding from a bead portion of the pneumatic tire. The method of manufacturing a pneumatic tire according to claim 1 or 2, characterized in that is interposed in contact with the elastic member to the inner liner member to said clamping member. The pneumatic tire according to claim 1 or 2 , wherein a cover member made of an elastic body that abuts on the inner liner member and abuts on an inner surface of a bead portion of the pneumatic tire is interposed in the clamp member. Manufacturing method. The method for producing a pneumatic tire according to any one of claims 1 to 4 , 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 4 , wherein a thermoplastic resin or a thermoplastic elastomer composition is used as a constituent material of the inner liner member. Wherein after having previously waterproofed on the inner surface of the inner liner member, the manufacturing method of the pneumatic tire according to any one of claims 1 to 6, wherein the use of steam as the pressurizing medium. The method for manufacturing a pneumatic tire according to any one of claims 1 to 6 , wherein an inert gas is used as the pressurizing medium. Any the green tire a plurality of holes penetrating in its thickness direction provided, according to claim 1-8, 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 shaping unit having a pair of clamp members for gripping an inner liner member serving as an innermost surface member of a pneumatic tire, a mold for molding the outer surface of the pneumatic tire, and the shaping unit having the central axis as the mold A shaping unit receiving portion that receives the central unit so as to coincide with the central axis of the sheet, a heating unit that heats the mold, and a pressurized medium supply unit that supplies a pressurized medium to the inside of the inner liner member through the shaping unit. One clamp member is configured to be able to move forward and backward toward the other clamp member, and the pair of clamp members includes the inner liner member in a state before the pressure medium is supplied to the inner side of the inner liner member. The pressure medium is gripped so as to be cylindrical, and the pressure medium is supplied to the inner side of the inner liner member. Vulcanizer pneumatic tire characterized by gripping in a state where the pair of clamping members are inflated the inner liner member to narrow the mutual spacing to the outer side in the tire radial direction in the state. The pneumatic tire vulcanizing apparatus according to claim 10 , wherein an elastic body that contacts the inner liner member is interposed in the clamp member. 11. The pneumatic tire according to claim 10 , 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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