Method of making a pneumatic radial tire having inner carcass pl

Details Method of making a pneumatic radial tire having inner carcass pl Method of making a pneumatic radial tire having inner carcass pl

1995-06-05

1996-07-23

Johnstone, Adrienne C.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

152557, 156133, B29D 3006, B29D 3038, B60C 902, B60C 908

Patent

active

055385729

ABSTRACT:
A pneumatic radial tire comprises a carcass comprising an outer carcass ply made of cords having a first heat-shrinkage-percentage K1 and an inner carcass ply is made of cords having a second heat-shrinkage-percentage K2 different from the first heat-shrinkage-percentage K1, and the cord tension of the inner carcass ply is smaller than the cord tension of the outer carcass ply. A method of making the tire comprises steps of making the outer carcass ply of cords having a first heat-shrinkage-percentage K1, making the inner carcass ply of cords having a second heat-shrinkage-percentage K2, wherein the first heat-shrinkage-percentage K1 at 150 degrees C. is 120 to 160% of the second heat-shrinkage-percentage K2 at 150 degrees C., and heating and vulcanizing a raw tire to heat-shrink the outer carcass ply cords in a larger degree than the inner carcass ply.

REFERENCES:
patent: 3245454 (1966-04-01), Lewis
patent: 3500888 (1970-03-01), Boileau
patent: 4378041 (1983-03-01), Tsurunaga et al.

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