Rubber-reinforcing aromatic polyamide fiber cords
AssigneeBridgestone Corporation
InventorsNorio Inada, Isamu Imai
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Abstract
Rubber-reinforcing polyamide fiber cords are disclosed which are each obtained by primarily twisting an aromatic polyamide filament yarn, doubling a plurality of thus primarily twisted yarns and finally twisting doubled yarns in a twisting direction opposite to that of the primary twist yarn to obtain a plied yarn, and applying a rubber adhesive to the thus obtained plied yarn. N and M satisfy the following relation: 1.05.ltoreq.M/N.ltoreq.1.6 in which N and M are the number of primary twists and the number of the twists in the cord, respectively.
Claims3
A rubber-reinforcing polyamide fiber cord which is obtained by primarily twisting an aromatic polyamide filament yarn, doubling a plurality of thus primarily twisted yarns and finally twisting doubled yarns in a twisting direction opposite to that of the primary twist yarn to obtain a plied yarn, and applying a rubber adhesive to the thus obtained plied yarn, wherein N and M satisfy the following equation;
- 1.05.ltoreq.M/N.ltoreq.1.6 in which N and M are the number of primary twists and the number of the ply twists in the cord respectively, where M is the number of twists per 10 cm of cord before ply twist yarns being untwisted under an initial load in grams of Denier/20 and N is the number of twists per 10 cm under a load in grams of Denier/20.times.1/number of primary twists.
Dependencies are inferred from the claim text.