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Plied cord, production method therefor, transmission belt, and method for using same

A technology for transmission belts and twisted ropes, applied in transmission belts, V-belts, textiles and papermaking, etc., can solve the problems of unrecorded pop-up resistance, inability to fully satisfy bending fatigue resistance, etc., and achieve the effect of improving tensile strength

Active Publication Date: 2019-06-04
MITSUBOSHI BELTING LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, even such a ply-twisted rope cannot sufficiently satisfy bending fatigue resistance in an ISG-mounted engine application.
In addition, in these patent documents, there is no description about pop-up resistance

Method used

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  • Plied cord, production method therefor, transmission belt, and method for using same
  • Plied cord, production method therefor, transmission belt, and method for using same
  • Plied cord, production method therefor, transmission belt, and method for using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～11 and comparative example 1～12

[0088] [Making of core wire]

[0089] As the core wires used in Examples 1 to 7 and Comparative Examples 1 to 4, the multifilaments (denier: 1100 decitex) of para-aramid fibers of a single repeating unit of the high elongation type are listed in Table 3 The indicated initial twist is first twisted along one direction, and after the four strands are aligned, the double twist is performed along the opposite direction to the initial twist at the double twist shown in Table 3, so as to make the total fineness of 4400 dtex respectively. Ply twist rope (S twist, Z twist). The ply-twisted rope obtained in this way was dipped in the prepreg solution for 10 seconds, and then heat-treated at 180° C. for 4 minutes. Next, the pre-dipped plied rope was immersed in the RFL treatment solution for 10 seconds, and then heat-treated at 230° C. for 2 minutes. Furthermore, the plied twisted rope after the RFL treatment was immersed in the outer coating treatment solution for 3 seconds, and then...

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Abstract

The present invention relates to a plied cord comprising three or four first twist yarns containing para-aramid fibers, wherein: the para-aramid fibers have an average size of 1000-1250 dtex, a tensile elasticity of 55-70 GPa and a tensile strength of 2800-3500 MPa; and for the plied cord, the number of first twists when the number of the first twist yarns is three is 33-40 twists / 10 cm and the number of first twists when the number of the first twist yarns is four is 42-52 twists / 10 cm, the second twist direction is the opposite direction from the first twist, and the ratio of the second twist coefficient to the first twist coefficient is 0.25-1.

Description

technical field [0001] The present invention relates to a ply-twisted rope used in a tension body of a transmission belt (especially a V-ribbed belt) and a manufacturing method thereof, and a transmission belt and a method of use thereof. Background technique [0002] High tensile strength and bending fatigue resistance are required for the core wire forming the tensile member of the V-ribbed belt, and especially an aramid core wire is used for high-load applications. An aramid core wire is usually produced by performing primary twisting on a fiber bundle and then double-twisting a plurality of initially twisted fiber bundles. However, the above-mentioned properties required for the aramid core wire are contradictory in that when the twist of the core wire is increased to improve the bending fatigue resistance, the tensile strength decreases instead, and it is difficult to achieve a good balance. In addition, in order to meet the requirements of high-load transmission, para...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D02G3/28F16G5/06
CPCD02G3/28D10B2331/021D02G3/447F16G5/20F16G1/28F16G1/10F16G5/08F16G5/06
Inventor 友田拓也
Owner MITSUBOSHI BELTING LTD
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