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Carcass ply manufacturing method and pneumatic tire manufacturing method

A technology of carcass ply and manufacturing method, which is applied to tires, household appliances, and other household appliances, etc., which can solve the problems of carcass ply separation, small joint strength, and small joint area of ​​joint parts, so as to prevent rigidity from becoming Effect of oversize, suppression of dents, and good appearance

Active Publication Date: 2019-02-12
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the joint area of ​​the joint portion of the butted cylindrical carcass plies is small, so there is a problem that the joint strength is low.
Therefore, in a green tire using a cylindrical carcass ply produced by butting, the both ends of the carcass ply may be separated due to expansion during vulcanization.

Method used

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  • Carcass ply manufacturing method and pneumatic tire manufacturing method
  • Carcass ply manufacturing method and pneumatic tire manufacturing method
  • Carcass ply manufacturing method and pneumatic tire manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0080] Pneumatic tires for passenger cars (size: 145 / 80R13) based on the specifications in Table 1 were tried out, and their performance was tested. The test method is as follows.

[0081]

[0082] Each test tire filled with an internal pressure (200 kPa) was rotated at the same speed with an FV measuring instrument, and force variation (FV) was measured. Evaluation is based on the reciprocal of the measured force change, and is represented by an index with the value of Comparative Example 1 being 100. The higher the number, the better it is.

[0083]

[0084] The presence or absence of dents, etc., of each test tire was visually confirmed by the examiner, and the appearance performance of each test tire was evaluated by the sense of the examiner. The evaluation is a score based on Comparative Example 1 being 100, and the larger the number, the less so-called dents and the better the appearance performance.

[0085] [Table 1]

[0086]

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Abstract

The small cylindrical carcass ply rigid difference was easily molded to provide a method capable of producing an excellent pneumatic tire appearance without impairing the productivity. A manufacturing method of a pneumatic tire a first step of obtaining the carcass ply P2 by cutting the carcass ply material P1, mosquitoes; and a second step of forming a cylindrical carcass ply P3 by overlapping both end portions of the Kasupurai P2, the first step, in the first holding means 8 and the second holding means 9, step holding for holding the carcass ply material P1, if Shin a first holding means 8 pull the carcass ply material P1 by the second holding means 9 is separated from each other; and, stretching the step of forming the extended portion R on both sides of the cut position X, and, after the stretching process, including. (select the cutting process to obtain the carcass ply P2 by cutting the carcass ply material P1 in the cutting position X Figure).

Description

technical field [0001] The present invention relates to a method for manufacturing a carcass ply and a method for manufacturing a pneumatic tire. Background technique [0002] Generally, a pneumatic radial tire has a carcass extending annularly across a pair of bead portions. The carcass is produced from a layer of carcass cords, that is, a carcass ply. The carcass ply generally includes a cord array in which carcass cords are arranged in parallel, and a topping rubber covering the cord array. [0003] Patent Document 1 below describes a technique in which both ends of a carcass ply are joined to form a cylindrical carcass ply in order to manufacture a pneumatic tire. Conventionally, when producing such a cylindrical carcass ply, lap splicing, butt splicing, and the like are known as methods for joining both end portions of the carcass cord. [0004] Patent Document 1: Japanese Patent Laid-Open No. 2014-087956 [0005] Lap splicing is a method of overlapping and connecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D30/38
Inventor 津川知大
Owner SUMITOMO RUBBER IND LTD
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