JP2009214349A - Cylindrical laminate forming method and pneumatic tire manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical laminate forming method for easily laminating a sheet material formed of a rubber composition, on both front and rear faces of a film-like cylindrical material, and to provide a pneumatic tire manufacturing method. <P>SOLUTION: The film-like cylindrical material 3 consisting of a thermoplastic resin or a thermoplastic elastomer composition formed by blending the thermoplastic resin and an elastomer is formed and twisted so as to be partially turned inside out. In this state, the film-like cylindrical material 3 is stretched over a roll 1 abutting on one surface 3a of the cylindrical material 3, and a roll 2 abutting on the other surface 3b of the cylindrical material 3. A sheet material 11 formed of a rubber composition is laminated on the other surface 3b of the cylindrical material 3 in the position of the roll 1, and a sheet material 12 formed of a rubber composition is laminated on the one surface 3a of the cylindrical material 3 in the position of the roll 2. After forming the cylindrical laminate comprising the cylindrical material 3, the sheet material 11 and the sheet material 12, an unvulcanized tire including the cylindrical laminate is formed, and the unvulcanized tire is vulcanized. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for forming a cylindrical laminate and a method for manufacturing a pneumatic tire using the cylindrical laminate, and more specifically, a sheet material made of a rubber composition is simply laminated on both front and back surfaces of a film-like cylindrical material. The present invention relates to a method for forming a cylindrical laminate and a method for manufacturing a pneumatic tire that can be performed.

  In recent years, it has been proposed to use a film-like cylindrical material as a tire constituent member for forming an air permeation preventive layer or the like of a pneumatic tire (see, for example, Patent Document 1). Such a film-like cylindrical material can be handled alone, but it is desired to laminate a sheet material made of a rubber composition on at least one surface so as not to cause wrinkles.

  Conventionally, as a method of laminating a sheet material made of a rubber composition on a film-like cylindrical material, the cylindrical material is hung over a pair of rolls, and the cylindrical material is rotated on the outer peripheral side of the cylindrical material. It has been proposed that a sheet material is pressure-bonded to the outer peripheral surface of a cylindrical material between a disposed crimping device and a roll (see, for example, Patent Document 2).

  According to the method as described above, it is easy to stack the sheet material on the outer peripheral surface of the cylindrical material. However, when the sheet material is to be laminated on both the front and back surfaces of the cylindrical material, after the sheet material is laminated on one surface of the cylindrical material, the cylindrical material is once removed from the roll, and the cylindrical material is laminated with the sheet material. It is necessary to turn the sheet upside down and laminate another sheet material on the other surface of the cylindrical material, which is extremely complicated.

Further, in a method of crimping a sheet material to the outer peripheral surface of the cylindrical material in a state where the cylindrical material is stretched over a pair of rolls, another sheet material is bonded to the inner peripheral surface from the inner side of the cylindrical material. It is possible. However, it is extremely difficult to arrange the holding device and the crimping device together with the sheet material inside the cylindrical material.
JP 2001-219478 A JP 2007-320129 A

  An object of the present invention is to provide a method for forming a cylindrical laminate and a method for producing a pneumatic tire, which can easily laminate a sheet material made of a rubber composition on both front and back surfaces of a film-like cylindrical material. is there.

  In order to achieve the above object, a method for forming a cylindrical laminate according to the present invention includes forming a film-like cylindrical material comprising a thermoplastic elastomer composition obtained by blending a thermoplastic resin or a thermoplastic resin and an elastomer, and the cylindrical material. Is twisted so that a part of the cylindrical member is turned over, and is wound around a first roll that is in contact with one surface of the cylindrical member and a second roll that is in contact with the other surface of the cylindrical member, A first sheet material made of a rubber composition is laminated on the other surface of the cylindrical material at the position of one roll, and a second sheet material made of the rubber composition on one surface of the cylindrical material at the position of the second roll. It is characterized by laminating.

  In addition, the method for producing a pneumatic tire of the present invention for achieving the above object comprises forming a film-like cylindrical material made of a thermoplastic elastomer composition obtained by blending a thermoplastic resin or a thermoplastic resin and an elastomer, The cylindrical material is twisted so that a part of the cylindrical material is turned over, and is wound around a first roll that is in contact with one surface of the cylindrical material and a second roll that is in contact with the other surface of the cylindrical material, A first sheet material made of a rubber composition is laminated on the other surface of the cylindrical material at the position of the first roll, and a second material made of a rubber composition on one surface of the cylindrical material at the position of the second roll. By laminating the sheet material, after forming a cylindrical laminated body composed of the cylindrical material, the first sheet material, and the second sheet material, an unvulcanized tire including the cylindrical laminated body is formed, Characterized by vulcanizing vulcanized tires Is shall.

  According to the present invention, a film-shaped cylindrical material is twisted so that a part of the cylindrical material is turned upside down, and the first roll contacting the one surface of the cylindrical material and the other surface of the cylindrical material are contacted. The first sheet material made of a rubber composition is laminated on the other surface of the cylindrical material at the position of the first roll, and the rubber composition is formed on one surface of the cylindrical material at the position of the second roll. By laminating the second sheet material made of a material, the sheet material made of the rubber composition can be easily laminated on both the front and back surfaces of the film-like cylindrical material.

  In the present invention, the thickness of the cylindrical material is preferably 2 μm to 0.7 mm. A film-like cylindrical material having such a thickness can be twisted without causing breakage or elongation.

  About a 1st roll and a 2nd roll, relative arrangement | positioning can be selected suitably. When arranging the first roll and the second roll so that the rotation axes thereof are parallel to each other, the separation distance between the contact start point of the first roll with respect to the cylindrical material and the contact start point of the second roll with respect to the cylindrical material is set. It is preferable to set it to twice or more the width of the cylindrical material. As a result, the film-like cylindrical material can be twisted and wound around the first roll and the second roll. Moreover, it is also possible to arrange | position a 1st roll and a 2nd roll so that a rotating shaft may mutually cross | intersect.

  In the present invention, the cylindrical laminate is used as a tire constituent member, and it is particularly preferable to constitute an air permeation preventive layer disposed on the tire inner surface along the carcass layer. In this case, excellent air permeation prevention performance can be exhibited based on a film-like cylindrical material made of a thermoplastic resin or a thermoplastic elastomer composition.

  Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view schematically showing an example of a molding apparatus for carrying out the method for molding a cylindrical laminate of the present invention. As shown in FIG. 1, the forming apparatus includes a pair of rolls 1 (first roll) and roll 2 (second roll) whose rotation axes are arranged in parallel to each other. At least one of these rolls 1 and 2 is configured to be rotationally driven by a driving means (not shown).

  The cylindrical material 3 is wound around the rolls 1 and 2. At that time, the cylindrical material 3 is twisted so that a part of the cylindrical material 3 is turned over. The roll 2 is installed so as to abut against the other surface 3b of the cylindrical member 3. The cylindrical member 3 is continuously rotated with the rotation of the rolls 1 and 2 while maintaining the twisted state.

  When the rolls 1 and 2 are arranged so that the rotation axes are parallel to each other as described above, the separation distance L between the contact start point of the roll 1 with respect to the cylindrical material 3 and the contact start point of the roll 2 with respect to the cylindrical material 3 is cylindrical. It is good to set it to 2 times or more of the width | variety of the material 3, More preferably, 2-10 times. Thus, the film-like cylindrical material 3 can be twisted so as to straddle the rolls 1 and 2.

  The cylindrical material 3 is composed of a thermoplastic resin or a thermoplastic elastomer composition. Therefore, even if the cylindrical material 3 receives tension when it is wound around the rolls 1 and 2, it does not substantially stretch. The thickness of the cylindrical member 3 is 2 μm to 0.7 mm, more preferably 5 μm to 0.5 mm. If the thickness of the cylindrical member 3 is too thin, breakage and elongation are likely to occur. Conversely, if the thickness is too thick, it is difficult to obtain a twisted state.

  Cylindrical material 3 may be formed by joining both ends of a sheet-like extrudate to each other and processed into a cylindrical shape, or may be a cylindrical extrudate. A cylindrical extrudate is preferred because there is no reduction in strength due to bonding. Moreover, the cylindrical material 3 may be provided with an adhesive layer on the surface in advance, or an adhesive may be applied to the surface of the cylindrical material 3 in a state of being installed in the molding apparatus.

  At the position of the roll 1, a sheet material 11 (first sheet material) made of a rubber composition is supplied from the outside of the cylindrical material 3. This sheet material 11 is laminated on the other surface 3 b of the cylindrical material 3. On the other hand, at the position of the roll 2, a sheet material 12 (second sheet material) made of a rubber composition is supplied from the outside of the cylindrical material 3. This sheet material 12 is laminated on one surface 3 a of the cylindrical material 3. The range in which the sheet materials 11 and 12 are laminated on the cylindrical material 3 may be the entire width direction of the cylindrical material 3 or a part of the cylindrical material 3 in the width direction. Further, the sheet materials 11 and 12 may be stacked while being shifted in the width direction of the cylindrical material 3 or stacked so as to protrude from the cylindrical material 3. When laminating the sheet materials 11, 12 on the cylindrical material 3, a crimping device for crimping the sheet materials 11, 12 to the cylindrical material 3 can be appropriately provided at a position facing the rolls 1, 2.

  When forming a cylindrical laminated body using the above forming apparatus, first, the roll 1 and the cylinder that are in contact with one surface 3a of the cylindrical material 3 in a state in which the cylindrical material 3 is twisted so that a part thereof is turned over. It is hung so as to straddle the roll 2 that contacts the other surface 3a of the material 3. Next, the cylindrical material 3 is rotated by rotating at least one of the rolls 1 and 2, and the sheet material 11 is laminated over the entire circumference of the other surface 3 b of the cylindrical material 3 at the position of the roll 1. By laminating the sheet material 12 over the entire circumference of the one surface 3a of the cylindrical material 3 at the position 2, a cylindrical laminate composed of the cylindrical material 3, the sheet material 11 and the sheet material 12 can be obtained. .

  According to the above-described method for forming a cylindrical laminate, the sheet materials 11 and 12 made of a rubber composition can be easily laminated on the front and back surfaces 3a and 3b of the film-like cylindrical material 3. Moreover, since it is not the structure which arrange | positions the holding | maintenance apparatus and crimping | compression-bonding apparatus with a sheet | seat material inside the cylindrical material 3, there also exists an advantage that an apparatus structure does not become complicated.

  In the cylindrical laminated body forming apparatus described above, the cylindrical member 3 is wound around the rolls 1 and 2, but is not limited to such a structure. May be added as appropriate.

  FIG. 2 is a perspective view schematically showing a modification of the molding apparatus for carrying out the method for molding a cylindrical laminate of the present invention. As shown in FIG. 2, the molding apparatus includes a pair of rolls 1 (first roll) and roll 2 (second roll) arranged so that the rotation axes intersect each other. At least one of these rolls 1 and 2 is configured to be rotationally driven by a driving means (not shown).

  The cylindrical material 3 is wound around the rolls 1 and 2. At that time, the cylindrical material 3 is twisted so that a part of the cylindrical material 3 is turned over. The roll 2 is installed so as to abut against the other surface 3b of the cylindrical member 3. In this case, since the rotation axes of the rolls 1 and 2 intersect each other, tension is applied to the cylindrical material 3 by applying the auxiliary rolls 4 and 5 to the inverted portion of the cylindrical material 3.

  Even in the case of forming a cylindrical laminated body using the above molding apparatus, the sheet materials 11 and 12 made of a rubber composition are simply applied to the front and back surfaces 3a and 3b of the film-like cylindrical material 3 as in the above-described embodiment. Can be laminated.

  The cylindrical laminate obtained in this manner is used as a tire constituent member. For example, the cylindrical laminate preferably constitutes an air permeation preventive layer disposed on the tire inner surface along the carcass layer. In this case, excellent air permeation prevention performance can be exhibited based on the film-like cylindrical material 3 made of the thermoplastic resin or the thermoplastic elastomer composition, and the sheet made of the rubber composition on both the front and back surfaces of the cylindrical material 3. Since the materials 11 and 12 are laminated, the film-like cylindrical material 3 can be protected at the time of manufacturing and using the tire.

  When a cylindrical laminate is used as an air permeation prevention layer, a cylindrical laminate is disposed on the outer peripheral side of the molding drum, and a tire constituting member such as a carcass layer is bonded to the outer peripheral side of the primary green tire. Then, after forming a tread ring including a belt layer, expanding the primary green tire and integrating it with the tread ring to form a secondary green tire, the secondary green tire is vulcanized to obtain a cylindrical laminate. A pneumatic tire constituting the air permeation preventive layer can be obtained.

  Below, the film-like cylindrical material used by this invention is demonstrated. This film-like cylindrical material 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 the standard atmosphere as defined by JIS K7100 in the 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 film-like cylindrical material and used as a single unit for the molding process of the cylindrical laminate, but it is bonded to improve the adhesion to the adjacent rubber. Layers may be stacked. 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.

It is a perspective view which shows roughly an example of the shaping | molding apparatus for enforcing the shaping | molding method of the cylindrical laminated body of this invention. It is a perspective view which shows roughly the modification of the shaping | molding apparatus for enforcing the shaping | molding method of the cylindrical laminated body of this invention.

Explanation of symbols

1 roll (1st roll)
2 rolls (second roll)
DESCRIPTION OF SYMBOLS 3 Cylindrical material 3a One surface of cylindrical material 3b The other surface of cylindrical material 4,5 Auxiliary roll 11 Sheet material (1st sheet material)
12 Sheet material (second sheet material)

Claims (9)

  A film-like cylindrical material made of a thermoplastic elastomer composition obtained by blending a thermoplastic resin or a thermoplastic resin and an elastomer is molded, and the cylindrical material is twisted so that part of the cylindrical material is turned over. It is wound around a first roll that abuts on one surface of the material and a second roll that abuts on the other surface of the cylindrical material, and is made of a rubber composition on the other surface of the cylindrical material at the position of the first roll. A method for forming a cylindrical laminate, comprising laminating a first sheet material and laminating a second sheet material made of a rubber composition on one surface of the cylindrical material at the position of the second roll.   The method for forming a cylindrical laminate according to claim 1, wherein the cylindrical material has a thickness of 2 μm to 0.7 mm.   The first roll and the second roll are arranged so that their rotational axes are parallel to each other, and a separation distance between a contact start point of the first roll with respect to the cylindrical material and a contact start point of the second roll with respect to the cylindrical material The method for forming a cylindrical laminate according to claim 1, wherein is set to be at least twice the width of the cylindrical material.   3. The method for forming a cylindrical laminate according to claim 1, wherein the first roll and the second roll are arranged so that rotation axes intersect each other.   A film-like cylindrical material made of a thermoplastic elastomer composition obtained by blending a thermoplastic resin or a thermoplastic resin and an elastomer is molded, and the cylindrical material is twisted so that part of the cylindrical material is turned over. It is wound around a first roll that abuts on one surface of the material and a second roll that abuts on the other surface of the cylindrical material, and is made of a rubber composition on the other surface of the cylindrical material at the position of the first roll. By laminating a first sheet material and laminating a second sheet material made of a rubber composition on one surface of the cylindrical material at the position of the second roll, the cylindrical material, the first sheet material, and the first A method for producing a pneumatic tire, comprising: forming a cylindrical laminated body made of two sheet materials, molding an unvulcanized tire including the cylindrical laminated body, and vulcanizing the unvulcanized tire.   The method for manufacturing a pneumatic tire according to claim 5, wherein the cylindrical material has a thickness of 2 μm to 0.7 mm.   The first roll and the second roll are arranged so that their rotational axes are parallel to each other, and a separation distance between a contact start point of the first roll with respect to the cylindrical material and a contact start point of the second roll with respect to the cylindrical material The method for manufacturing a pneumatic tire according to claim 5 or 6, wherein is set to be not less than twice the width of the cylindrical member.   The method for manufacturing a pneumatic tire according to claim 5 or 6, wherein the first roll and the second roll are arranged so that rotation axes intersect each other.   The method for manufacturing a pneumatic tire according to any one of claims 5 to 8, wherein the cylindrical laminate constitutes an air permeation preventive layer.

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