Multilayer strand cord twisting process and core wire straightener

Abstract

The invention relates to a multilayer strand cord twisting process and a core wire straightener. The process comprises three steps of core strand twisting, outer layer strand twisting and external winding, wherein the pitch in core strand twisting is controlled to be 11.1-12.3mm; the straightener is additionally arranged between core strand twisting and outer layer strand twisting, and comprises a bracket and an inlet end guide wheel; a transverse adjustable rolling mechanism and a vertical adjustable rolling mechanism are simultaneously arranged on the bracket; a core strand sequentially penetrates through each pulley block of the transverse adjustable rolling mechanism and the vertical adjustable rolling mechanism of the straightener; and during outer layer strand twisting, the ratio of the core strand rotating speed to a top wire rotating speed is controlled to be any value of (0.91:1)-(0.93:1), and the over-twist speed ratio in twisting is controlled to be 97%-99%. The invention can eliminate residual stress of the core wire, so that the inner layer stress and the outer layer stress of the cord are in balance more easily, the finished product of the cord after aging is more stable in twisting, residual twisting of the cord is easier to control and adjust in the production process, the overall stress is smaller when the cord is used in a tire factory, and the cord can not generate edge lifting and unevenness easily.

Description

technical field [0001] The invention relates to a multi-layer cord twisting technology, in particular to a multi-layer cord twisting technology and a core wire straightener. Background technique: [0002] At present, there are many problems in the twisting process of multi-layer cords in some twisting equipment, mainly manifested in the unbalanced stress of the inner and outer strands of the cord, and the residual torsion of the core strands after stripping the core is relatively large. The film is uneven and the edge is easy to warp, which will affect the tire production process and also affect the performance and life of the tire. Invention content: [0003] The invention overcomes the deficiencies in the existing equipment and technology, and provides a multi-layer strand cord twisting process and a core wire straightener. [0004] Technical solutions: [0005] A core wire straightener for multi-layer cord twisting, installed at the wire inlet position between the cor...

AI Technical Summary

Problems solved by technology

[0002] At present, there are many problems in the twisting process of multi-layer cords in some twisting equipment, mainly manifested in the unbalanced stress of the inner and outer strands of the cord, and the residual torsion of the core strands after stripping the core is relatively large. The film is uneven and the edge is easy to warp, which will affect the tire production process and also affect the performance and life of the tire

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