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Pneumatic tire

A technology of pneumatic tires and thermoplastic resins, applied in the direction of pneumatic tires, special tires, tire parts, etc., can solve the problems of film peeling, joint cracks, high rigidity, etc., and achieve excellent formability and durability, and good processability , The effect of reducing the rigidity difference

Inactive Publication Date: 2014-12-17
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned method has the following problems: the joint portion where the film sheets including thermoplastic resin are overlapped is more rigid than the film sheet portion around it, and therefore, the difference in rigidity between the film sheet and the peripheral portion may cause tire molding ( Cracks occur near the joint part when the mold is ejected) or after starting to drive
[0007] However, the operation of providing holes or slits in the thermoplastic resin film sheet specifically proposed in Patent Document 1 weakens the joint strength of the film sheet locally or as a whole, and locally uneven tension occurs during tire molding (mold ejection). Defective molding due to stretching or delamination between layers, or delamination of the film sheet after the start of driving, unable to exhibit expected performance, and durability problems

Method used

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Examples

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Embodiment

[0077] Hereinafter, the pneumatic tire of the present invention will be specifically described by way of examples and the like.

[0078] In addition, each test tire was evaluated by the method described below.

[0079] 〔General matters〕

[0080] As test tires, tires of size 195 / 65R15 were manufactured. The resin film sheet is obtained by blending a thermoplastic resin and an elastomer, has a thickness of 200 μm, and is formed into a cylindrical shape by overlapping and joining (thermally joining; the circumferential length of the overlapping portion is 1.5 cm) at both ends.

[0081] Respectively as described below, the moldability of each embodiment and comparative example is tested, and then assembled in the test tire, for the inner liner ( Figure 5 (a)) or reinforcing layer (side wall part ( Figure 5 (c) form)) to evaluate the practical performance.

[0082] 〔Evaluation method of moldability〕

[0083] In the assembling process of the above-mentioned test tire, tire co...

example 1-3

[0094] In the entire tire width direction of the spliced ​​portion (tire circumferential length 15mm), such as figure 1As shown in (a) and (b), a plurality of cylindrical depressions (diameter 5mm) are provided on the resin film sheet on the tire outer peripheral side (cord side) or / and the resin film sheet on the inner cavity side.

[0095] When the ends are laminated to form a cylindrical shape, the joint surfaces P where the two layers are joined to each other are all flat surfaces, and no depressions or the like are provided.

[0096] Cylindrical depressions formed on the non-joint surfaces can be formed at a faster rate than in Comparative Example 2 by using laser processing.

example 1

[0097] Example 1 A recess was provided on a resin film sheet on the tire outer peripheral side (cord side).

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Abstract

The present invention provides a pneumatic tire, in which a resin film sheet produced by making a thermoplastic elastomer composition containing a thermoplastic resin or a mixture of a thermoplastic resin and an elastomer into a sheet is used, and a cylindrical product produced by joining edge parts of the sheet to each other and then subjecting the cylindrical product to a vulcanization molding process is used as an inner liner layer or a reinforcing layer, wherein no crack is formed in the vicinity of the joined part in the resin film sheet during a step of molding the pneumatic tire and after the beginning of the running of the pneumatic tire and moldability and durability of the pneumatic tire are excellent. In the pneumatic tire according to the present invention which has an overlapped splice part formed by joining the edge parts of the resin film sheet to each other in an overlapped manner, at least one of two layers in the overlapped splice part, which are layers formed as the result of the joining of the edge parts of the film sheet material to each other in an overlapped manner, has, on the non-joined surface portion thereof, concaved parts each having a depth (D (mum)) smaller than the thickness (T (mum)) of the film sheet material, and both the joined surface portions in the two layers are made flat so that the flat surface portions are joined to each other.

Description

technical field [0001] The present invention relates to a pneumatic tire. [0002] In more detail, it relates to a pneumatic tire that uses a resin film sheet, connects the ends of the sheet to each other by splicing, forms a cylindrical shape, and then vulcanizes it to be used as an inner liner or a reinforcing layer. During the molding process of the pneumatic tire or after the pneumatic tire starts to run, no cracks will occur near the contacting portion of the resin film sheet, and the moldability and durability are excellent; wherein the resin film sheet is made of a thermoplastic resin or contains a thermoplastic resin. The thermoplastic elastomer composition blended with the elastomer is formed into a sheet. Background technique [0003] It has been proposed and studied to use a film sheet containing a thermoplastic resin for an inner liner, a reinforcing layer, etc. of a pneumatic tire (Patent Document 1). [0004] In order to use the thermoplastic resin-containing...

Claims

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Application Information

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IPC IPC(8): B60C5/14C08L21/00C08L101/00
CPCB60C5/14C08L21/00B60C2005/145B60C2005/147Y10T152/10495B60C1/0008B60C1/00B60C5/12
Inventor 桥村嘉章濑户秀树松田淳
Owner YOKOHAMA RUBBER CO LTD
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