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Manufacturing method of rubber member for tire

A manufacturing method and component technology, applied in tires, applications, household appliances, etc., can solve the problems of poor appearance, uniformity and tire quality, thickening and other problems

Inactive Publication Date: 2009-12-02
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, an object of the present invention is to provide a method of manufacturing a rubber component capable of solving the problems caused by thickening in the conventional method, namely: deterioration of uniformity and tire quality, deterioration of tire appearance, molding precision of the rubber component and Reduced degree of freedom in molding shape, etc., while trying to increase productivity of rubber components

Method used

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  • Manufacturing method of rubber member for tire
  • Manufacturing method of rubber member for tire
  • Manufacturing method of rubber member for tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A pneumatic tire (tire size 215 / 45ZR17) in which the tread rubber was formed using rubber strips having the specifications in Table 1 was manufactured, and the defect formation and uniformity of the outer surface of each test tire were compared and evaluated. Other specifications are the same except those shown in Table 1.

[0057] (1) The formation of defects

[0058] The wear of the outer surface of the tread was inspected on 30 test tires by visual inspection, and evaluated according to the following standards A, B and C.

[0059] A: No abrasion or the like was found.

[0060] B: A small defect is found. (mild level that does not require trimming)

[0061] C: A large defect is found. (Need trim level)

[0062] (2) Uniformity

[0063] According to the JASO C607 standard, the RFV (O.A.) was measured using a forced vibration (FV) test device, and the average value of 30 test tires was obtained.

[0064]

Embodiment 2

[0066] Pneumatic tires (tire size 215 / 45ZR17) were manufactured in which sidewall rubber was formed using rubber strips having the specifications in Table 2, and the handling properties of the rubber strips and the defect formation on the outer surface of each tire were compared and evaluated. In this case, the rubber strip according to the conventional embodiment uses a rubber strip having a rectangular cross-sectional shape (α=β=90°). The rubber strip according to the present embodiment uses a rubber strip having a trapezoidal cross-sectional shape (α=β). All other specifications except Table 2 are the same. In addition, each column in Table 2 describes the evaluation of the defect formation condition of the upper layer part, and the evaluation of the handling performance of the rubber strip of the lower layer part.

[0067] (1) The formation of defects

[0068] A non-defective product is set as a case where there is no wear or the like or a case where there is a small def...

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Abstract

The invention can reduce a step between rubber strips even in the case that the rubber strip is made thick, and inhibits a reduction of uniformity and tire quality, a deterioration of a tire outer appearance, and the like. A rubber strip ( 10 ) may be scalene triangular shape, a trapezoidal shape or a parallelogram shape having has a bottom line ( 11 ) forming a strip width (W), a first diagonal line ( 12 ) extending from one end of the bottom line ( 11 ) and a second diagonal line ( 13 ) extending from the other end (P 2 ) of the bottom line ( 11 ), a length (L 0 ) of the bottom line is set to 5 to 50 mm, and a thickness (T) thereof is set to 0.2 to 5.0 mm.

Description

Background technique [0001] The present invention relates to a method of manufacturing a rubber component for tires by overlapping and winding rubber strips in a helical form in the circumferential direction. [0002] In pneumatic tires, various rubber components are used whose composition and cross-sectional shape are differentiated according to desired characteristics of parts used such as tread rubber, sidewall rubber, clinch rubber, Brake pad rubber, lining rubber, etc. Conventionally, a molded body extruded by a rubber extruder or the like in accordance with a desired cross-sectional shape of each rubber component is used as the rubber component. In the green tire building step, each rubber component is formed by winding a cut-to-length sheet-like molded body once on a building drum or similar device. [0003] In contrast, in recent years, as shown in FIG. 10(A), a so-called strip wind method has been proposed to form a rubber component c by overlapping and winding rubb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D30/60B29D30/72
Inventor 林典男面川寿彦
Owner SUMITOMO RUBBER IND LTD
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