JP2009241399A - Manufacturing method of pneumatic tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a pneumatic tire having an inner liner layer composed of thermoplastic resin film consisting essentially of thermoplastic resin, without impairing the inner liner layer. <P>SOLUTION: In the pneumatic tire manufacturing method, thermoplastic resin films 1a, 1b, 1c are adhered to the inner face of a tire as an inner liner layer, wherein the thermoplastic resin films are composed of thermoplastic resin or thermoplastic resin elastomer composition in which thermoplastic resin and elastomer are blended. In the method, a pneumatic tire having no inner liner layer of the thermoplastic resin films is preliminarily vulcanized and molded, with the thermoplastic resin films 1a, 1b, 1c adhered to the inner face of this pneumatic tire. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a method for manufacturing a pneumatic tire, and more particularly, manufacturing a pneumatic tire that enables manufacturing without damaging an inner liner layer made of a thermoplastic resin film mainly composed of a thermoplastic resin. Regarding the method.

  In general, a tubeless pneumatic tire has an inner liner layer for preventing air permeation on the inner surface of the tire. Conventionally, a butyl rubber excellent in air permeation prevention property has been used for the inner liner layer, but the butyl rubber has a large specific gravity, so as part of weight reduction of the tire, a thermoplastic resin or Many proposals have been made to use a thermoplastic resin film made of a thermoplastic resin elastomer composition (hereinafter simply referred to as “thermoplastic resin film”) (see, for example, Patent Document 1).

However, since the thermoplastic resin film is softened at a high temperature, when an unvulcanized tire using this as an inner liner layer is heated and vulcanized, the vulcanized tire is detached from the mold. When the bladder on the inside of the tire is shrunk and separated, there is a problem that the bladder at the time of separation is rubbed and scratched on the surface of the thermoplastic resin film that is still in a softened state.
JP-A-9-164805

  An object of the present invention is to provide a pneumatic tire that can manufacture a pneumatic tire having an inner liner layer made of a thermoplastic resin film mainly composed of a thermoplastic resin so as not to damage the inner liner layer. It is to provide a manufacturing method.

  The method for producing a pneumatic tire according to the present invention that achieves the above object has, as an inner liner layer, a thermoplastic resin film made of a thermoplastic resin elastomer composition in which a thermoplastic resin or a thermoplastic resin and an elastomer are blended on the tire inner surface. In the method for producing a pneumatic tire, the pneumatic tire without an inner liner layer of the thermoplastic resin film is pre-vulcanized and bonded, and the thermoplastic resin film is attached to the inner surface of the pneumatic tire. To do.

  When affixing the thermoplastic resin film, it may be affixed by dividing it into at least an inner peripheral surface and both side surfaces in the tire meridian direction and / or affixed by dividing it into two or more in the tire circumferential direction. May be.

  In addition, the thermoplastic resin film may be attached by thermal fusion, or may be attached via an adhesive.

  According to the method for producing a pneumatic tire of the present invention, a pneumatic tire without an inner liner layer of a thermoplastic resin film is vulcanized in advance, and the thermoplastic resin film is pasted on the inner surface of the tire. Therefore, as in the conventional manufacturing method, it is possible to eliminate damage to the thermoplastic resin film caused by rubbing the surface of the thermoplastic resin film in the softened state when the bladder is removed after vulcanization molding. it can.

  In the method for manufacturing a pneumatic tire according to the present invention, the unvulcanized tire is molded as a structure having no thermoplastic resin film as an inner liner layer. The pneumatic tire which does not have the inner liner layer which consists of the thermoplastic resin film is previously vulcanized-molded. This vulcanization molding may be performed by a known pneumatic tire vulcanization method. As a pneumatic tire having no inner liner layer, a thin inner liner layer made of rubber such as butyl rubber may be provided if necessary.

  Next, a thermoplastic resin film is bonded as an inner liner layer to the inner surface of the vulcanized pneumatic tire. As a method for attaching the thermoplastic resin film to the inner surface of the tire, the thermoplastic resin film may be directly adhered by thermal fusion, or may be attached via an adhesive. In this case, a stitcher roller may be used as an auxiliary means, and the stitcher roller may be pressed against the inner surface of the tire while rolling on the surface of the thermoplastic resin film. Thereby, strong adhesion can be performed while removing wrinkles. As the stitcher roller, a drum-shaped roller whose surface is swollen outwardly in a convex curved surface in a cross section including the rotation axis is preferably used.

  Thus, since a thermoplastic resin film is affixed on the inner surface of a pre-vulcanized pneumatic tire, the thermoplastic resin film is not damaged. Moreover, since there is no malfunction which makes the thickness of a thermoplastic resin film non-uniform | heterogenous by the lift-up at the time of a vulcanization shaping | molding like the conventional manufacturing method, air permeation prevention property can be improved.

  As a thermoplastic resin film, what was shape | molded by the cylindrical shape may be affixed as a single body by inserting in a tire inner surface. However, since the cylindrical film is very troublesome in adjusting the size of the tire inner surface dimension and the like in order to prevent wrinkles, the thermoplastic film is preferably divided into a plurality of sections before being attached. . As a method of dividing into a plurality of sections, the thermoplastic resin film is divided into at least a portion covering the tire inner peripheral surface and a portion covering both tire side surfaces in the tire meridian direction, or two or more in the tire circumferential direction. There is a method of dividing into parts.

  FIG. 1 is a cross-sectional view in the tire meridian direction schematically showing an example of a pneumatic tire manufactured by the manufacturing method of the present invention, and illustration of structures such as a carcass layer and a belt layer inside the tire body is omitted. .

  In FIG. 1, thermoplastic resin films 1a and 1b divided into five in the tire meridian direction are attached as inner liner layers to the inner surface of a vulcanized pneumatic tire T that does not have an inner liner layer of a thermoplastic resin film. It is attached. The thermoplastic resin film 1a is affixed on the inner peripheral surface corresponding to the tread portion so as to be continuous in the tire circumferential direction. The thermoplastic resin film 1a may be a cylindrical film, or may be one or a plurality of strip-shaped films in which end portions in the circumferential direction are spliced together. The thermoplastic resin film 1b divided into two portions in the radial direction on both the left and right sides corresponds to the respective side wall portions and bead portions on the both side surfaces of the tire, and the radial end portions overlap each other. And pasted so as to be continuous in the tire circumferential direction. The thermoplastic resin film 1b may be a film cut out in a donut shape (annular shape), or may be a film obtained by splicing a film cut out in a fan shape in the circumferential direction.

  Thus, since the thermoplastic resin film is divided and attached to at least the inner peripheral surface and both side surfaces in the tire meridian direction, it can be easily attached without causing wrinkles. The number of divisions in the tire meridian direction may be 3 or more, preferably 3 or 5.

  The order of attaching the thermoplastic resin film is not particularly limited. First, the thermoplastic resin film on the tire inner peripheral surface is attached, and then the heat is applied to both side surfaces in the order of the third wall portion to the bead portion. A plastic resin film may be attached.

  Further, as shown in FIG. 1, when the thermoplastic resin films on both side surfaces are each divided into two, the meridian splice portion is not present in the sidewall region and is arranged so as to overlap the bead filler of the bead portion. It is good. Since the sidewall region is repeatedly deformed when the tire rolls, if the splice portion of the thermoplastic resin film is disposed, there is a possibility of causing a tire failure. Note that the sidewall region is a region from the end of the belt layer having the maximum width to the apex of the bead filler in the bead portion from the inside 5 mm in the tire center line direction.

  FIG. 2 is a tire equator sectional view schematically showing another example of a pneumatic tire manufactured by the manufacturing method of the present invention. As in FIG. 1, the illustration of the structure inside the tire body is omitted.

  In FIG. 2, a thermoplastic resin film 1c divided into four in the tire circumferential direction is attached as an inner liner layer to the inner surface of a vulcanized pneumatic tire T that does not have an inner liner layer of a thermoplastic resin film. It has been. Thus, even if it divides | segments in a tire peripheral direction, it can affix simply, without producing a wrinkle similarly to the case where it divides | segments in a meridian direction. The number of divisions in the tire circumferential direction is 2 or more, preferably 4-8.

  In the production method of the present invention, as a method for dividing the thermoplastic resin film, division in the tire meridian direction and division in the tire circumferential direction may be combined. That is, a part or all of the thermoplastic resin film divided into at least the inner peripheral surface and both side surfaces in the tire meridian direction may be further divided in the tire circumferential direction and attached. The number of divisions in the tire circumferential direction is preferably 2 or more, more preferably 4 to 8.

  In the present invention, as a means for attaching the thermoplastic resin film to the inner surface of the tire, there are a method of attaching directly to the inner surface of the pneumatic tire by heat fusion and a method of attaching using an adhesive. The temperature in the heat sealing method is preferably 100 to 270 ° C, more preferably 130 to 250 ° C. If the temperature of heat fusion is less than 100 ° C., the adhesive strength may be insufficient. On the other hand, if the temperature of heat fusion exceeds 270 ° C., the thermoplastic resin film becomes too soft during the heat fusion treatment, and the attaching operation becomes difficult.

  The type of adhesive when pasting with an adhesive is not particularly limited. For example, as a functional group, a maleimide group, an epoxy group, an isocyanate group, methylol and its bromide, a maleic anhydride group, a phenol group What has either of these can be used. These adhesives can be used according to the kind of thermoplastic resin film.

  The thermoplastic resin film used in the present invention is formed from a thermoplastic elastomer composition obtained by blending a thermoplastic resin or a thermoplastic resin and an elastomer.

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

  Moreover, the thermoplastic elastomer composition forming the thermoplastic resin film used in the present invention can be constituted by blending the above-described thermoplastic resin and elastomer.

  Examples of the elastomer constituting the thermoplastic elastomer composition include diene rubbers and hydrogenated products thereof [eg, natural rubber (NR), isoprene rubber (IR), epoxidized natural rubber, styrene butadiene rubber (SBR), butadiene] Rubber (BR, high cis BR and low cis BR), nitrile rubber (NBR), hydrogenated NBR, hydrogenated SBR], olefin rubber [for example, 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 [eg, Br-IIR, CI-IIR, isobutylene paramethylstyrene Copolymer bromide (Br-IPMS), black Plain rubber (CR), hydrin rubber (CHR), chlorosulfonated polyethylene rubber (CSM), chlorinated polyethylene rubber (CM), maleic acid modified chlorinated polyethylene rubber (M-CM)], silicone rubber [eg methyl vinyl silicone rubber , Dimethyl silicone rubber, methyl phenyl vinyl silicone rubber], sulfur-containing rubber (for example, polysulfide rubber), fluorine rubber (for example, vinylidene fluoride rubber, fluorine-containing vinyl ether rubber, tetrafluoroethylene-propylene rubber, fluorine-containing silicon) Rubber, fluorine-containing phosphazene rubber), thermoplastic elastomer (for example, styrene elastomer, olefin elastomer, ester elastomer, urethane elastomer, polyamido elastomer) and the like are preferable. It is possible to use.

  In the thermoplastic elastomer composition, the composition ratio between the specific thermoplastic resin and the elastomer is not particularly limited, and may be appropriately determined depending on the balance of film thickness, air permeation resistance, and flexibility, but is preferable. The range is 10/90 to 90/10 by weight ratio, more preferably 20/80 to 85/15.

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

  As the film of the thermoplastic elastomer composition, a film having a structure in which an elastomer is dispersed as a discontinuous phase in a matrix of a thermoplastic resin is preferably used. By adopting a 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.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further, the scope of the present invention is not limited to these Examples.

  Air in which a tire size is 195 / 65R15, and a thermoplastic resin film made of a thermoplastic resin elastomer composition in which nylon 6/66 copolymer and brominated butyl rubber (Br-IIR) are blended is used as an inner liner layer. In manufacturing the entering tire, ten pneumatic tires were manufactured respectively according to the following examples and conventional examples.

Example 1
An unvulcanized tire having no inner liner layer of a thermoplastic resin film was molded and vulcanized. As shown in FIG. 2, a thermoplastic resin film divided into four parts in the tire circumferential direction was directly attached to the inner surface of the pneumatic tire by thermal fusion at 250 ° C.

Example 2
Example except that a thermoplastic adhesive film was coated with a phenol-based adhesive (Ty-ply-BN (trade name) manufactured by Road Far East) instead of heat-sealing the thermoplastic resin film. In the same manner as in Example 1, a thermoplastic resin film was attached to the tire inner surface.

Conventional Example An unvulcanized tire having a thermoplastic resin film as an inner liner layer was molded and vulcanized by a bladder method.

  When ten tires manufactured by each method were visually inspected for the presence or absence of scratches (damage) on the inner liner layer, the number of tires in Examples 1 and 2 was 0, but in the conventional example, 8 This occurred.

It is sectional drawing of the tire meridian direction which shows an example of the pneumatic tire manufactured by this invention. It is sectional drawing of the tire equatorial plane which shows the other example of the pneumatic tire manufactured by this invention.

Explanation of symbols

1a, 1b, 1c Thermoplastic resin film T Pneumatic tire

Claims (5)

  In the method for producing a pneumatic tire having, as an inner liner layer, a thermoplastic resin film comprising a thermoplastic resin elastomer composition in which a thermoplastic resin or a thermoplastic resin and an elastomer are blended on the inner surface of the tire, the inner liner of the thermoplastic resin film A pneumatic tire manufacturing method in which a pneumatic tire having no layer is vulcanized in advance, and the thermoplastic resin film is attached to the inner surface of the pneumatic tire.   The method for manufacturing a pneumatic tire according to claim 1, wherein the thermoplastic resin film is divided and attached to at least an inner peripheral surface and both side surfaces in a tire meridian direction.   The manufacturing method of the pneumatic tire of Claim 1 or 2 which divides | segments the said thermoplastic resin film into 2 or more in the tire circumferential direction, and affixes it.   The method for manufacturing a pneumatic tire according to claim 1, 2 or 3, wherein the thermoplastic resin film is attached by heat sealing.   The manufacturing method of the pneumatic tire of Claim 1, 2, or 3 which affixes the said thermoplastic resin film via an adhesive agent.