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Steel cord, its production method and inflatable tyre containing said steel cord

A steel and cord technology, which is applied in the reinforcement layers of pneumatic tires, tire parts, auxiliary devices for rope making, etc. Poor and other problems

Inactive Publication Date: 2006-04-12
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of waving or zigzag permanent deformation of the monofilament, the wavy monofilament is more or less easily damaged depending on the way of waving, and the strength and fatigue resistance of the cord decrease.
Therefore, the durability of the rubber product deteriorates

Method used

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  • Steel cord, its production method and inflatable tyre containing said steel cord
  • Steel cord, its production method and inflatable tyre containing said steel cord
  • Steel cord, its production method and inflatable tyre containing said steel cord

Examples

Experimental program
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Embodiment Construction

[0017] In the drawings, a pneumatic tire 1 according to the present invention includes a tread portion 2, a pair of sidewall portions 3, and a pair of bead portions 4 each having a core 5 therein, the bead portions extending between the bead portions 4. The carcass 6 and the belts 7 , 9 arranged outside the carcass 6 in the tread portion 2 .

[0018] In this embodiment, the tire 1 is a radial tire for passenger cars.

[0019] The carcass 6 is composed of at least one cord layer 6A placed radially at an angle of 75 to 90 degrees with respect to the tire equator, between the bead portions 2 along the tread portion 2 and the tire The side portions 3 extend and turn up the core 5 in each bead portion 4 from the inside to the outside of the tire so as to form a pair of turn-up portions 6b and a main body portion 6a between the turn-up portions. In this embodiment, organic fibers such as nylon, rayon, and polyester are used as the carcass cords. In each bead portion 4, between the...

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Abstract

A steel cord is composed of three to six steel filaments each having a filament diameter of from 0.25 to 0.45 mm, the three to six steel filaments including shaped filaments and twisted together, wherein the shaped filaments are, before twisted together, coiled to be set in a form of coil having a coil diameter of less than 5 mm and a coil pitch of more than 5 mm, the shaped filaments include at least two kinds of shaped filaments which are different in respect of the form of coil, the shaped filaments are twisted together while the coil diameter is reduced, the elongation of the cord at 50N load is less than 0.2 %, and the cord strength is in a range of from 2500 to 3500 N / sq.mm.

Description

technical field [0001] The present invention relates to a steel cord for reinforcing rubber products, a method for producing the steel cord and a pneumatic tire having a cord reinforcing layer. Background technique [0002] As a typical rubber product, pneumatic tires are often reinforced with steel cords. [0003] In recent years, it has been used to increase the permeability of the top rubber to the cord by twisting together steel filaments including zigzag corrugated filaments. [0004] On the other hand, steel cords formed by loosely twisting linear filaments together are used as a conventional cord construction to improve rubber permeability. [0005] For the latter, the conventional structure of twisted monofilaments is easy to unravel at the cut end of the cord. Therefore, workability is poor in manufacturing cord-reinforced rubber layers for pneumatic tires, such as belt layers, breakers, carcass layers, and the like. In addition, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D07B1/06B60C9/10B60C9/00B60C9/20D07B7/02
CPCD07B1/0646D07B2201/2022D07B2205/3057D07B2501/2046Y10S57/902D07B2201/2007D07B2201/2024D07B7/025D07B2201/2008D07B2801/10
Inventor 宫崎真一山崎和美户田攻
Owner SUMITOMO RUBBER IND LTD
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