Cord, method of producing same, and rubber-cord composite body

a technology of rubber-cord and composite body, which is applied in the direction of rope making machines, yarns, textiles and papermaking, etc., can solve the problems of corroding the cord, difficult to provide spaces for allowing the rubber to sufficiently intrude into the inside of the strand, and difficulty in ensuring the integrity of the strand. , to achieve the effect of suppressing twisting and improving corrosion resistan

Inactive Publication Date: 2010-07-08
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0022]According to the present invention, the filaments constituting the strand are preliminarily coated with unvulcanized rubber, so that the unvulcanized rubber is allowed to flow and thus be distributed into the space between the filaments in the strand. The rubber, therefore, can sufficiently intrude into the inside of the strand, which enables to provide a cord having improved corrosion resistance and suppressed twisting reduction.

Problems solved by technology

That is, when the tire suffers an external injury, water intrudes from the external injury into the tire to reach the cords, which may corrode the cords.
This may cause a malfunction due to a separation with the corrosion area being as the origination of the separation.
The structure of the cord, thus, becomes complicated and it is difficult to provide spaces for allowing the rubber to sufficiently intrude into the inside of the strands.
As a result, the rubber cannot sufficiently intrude into the inside of the strands during the vulcanization step of the tire manufacturing process, so that improvement of the corrosion resistance is difficult.

Method used

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  • Cord, method of producing same, and rubber-cord composite body
  • Cord, method of producing same, and rubber-cord composite body
  • Cord, method of producing same, and rubber-cord composite body

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[0071]Various cords are manufactured under the specifications shown in Tables 1 and 2. The structures of the cords are shown in FIGS. 1, 2 and 5-18. It is noted that each of FIGS. 15-18 shows a sectional view of a conventional cord and each of FIGS. 1, 2 and 5-14 shows a sectional view of a cord according to the present invention.

[0072]A ply in which a plurality cords according to the present invention are arranged in parallel with each other and embedded in a rubber sheet with a given space therebetween is applied to a belt and a test tire is built with using this belt. The test tire is examined in relation to a ratio (%) of rubber intruding inside of a core strand of a cord used for reinforcement, a ratio (%) of rubber intruding inside of a sheath strand, a ratio (%) of rubber intruding between the core strand and the sheath strand, and twisting loss (%). In addition, the number of steps is also examined in the method of producing a cord according to the present invention.

[0073]In...

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Abstract

A cord obtained by twisting a plurality of strands each composed of a plurality of filaments is provided. A circumferential surface of the filament is coated with unvulcanized rubber to improve rubber intrusion, thereby improving corrosion resistance and suppressing twisting-loss.

Description

TECHNICAL FIELD[0001]The present invention relates to a cord used for reinforcing a rubber product such as a tire and an industrial belt, method of producing same, and a rubber-cord composite body.RELATED ART[0002]A high strength is demanded for a cord used for reinforcing a tire, especially a tire for a construction vehicle, so that a cord made of a plurality of strands produced by twisting a plurality of filaments, which strands are further twisted to form a so-called multiple-twisting structure, is used for this purpose.[0003]In the production of the cord having a multiple-twisting structure, however, a strand is made from a plurality of filaments and then a plurality of strands are twisted to give the cord. Thus, it has more filaments and a more complicated twisting structure than a cord having a single twisting structure used for reinforcing, for example, a passenger vehicle. As a result, a tensile strength of the cord becomes smaller than the sum of tensile strengths of the co...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D02G3/02
CPCD07B1/0613D07B1/0626D07B1/0633D07B1/165D07B7/145D07B2201/2023D07B2201/2028D07B2201/2029D07B2201/2037D07B2201/2039D07B2201/204D07B2201/2046D07B2201/2049D07B2201/2061D07B2201/2062D07B2201/2065D07B2201/2073D07B2201/2074D07B2201/2081D07B2207/205D07B2501/2046D07B2801/24D07B2801/12
Inventor NISHIMURA, MITSUHIRO
Owner BRIDGESTONE CORP
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