Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1987-04-22
1989-07-18
Hoch, Raymond
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
2642107, D01D 512
Patent
active
048491497
ABSTRACT:
A process for producing a pneumatic tire having high uniformity with a carcass ply formed of polyester cord, including the steps of: (a) spinning polyester at a tension at the solidifying point of melt polyester between 1.5.times.10.sup.7 and 7.5.times.10.sup.7 dyne/cm.sup.2 ; (b) drawing the polyester into a filament at a draw ration of 2.0 to 3.0; (c) twisting a polyester filament at a twist coefficient of from 800 to 2,500; and then (d) heat treating the filament so that the dimension unstabilizing factor is 8.5 or less. The polyester filament is made of polyester having an ethylene terephthalate component of at least 85 mol % and a high degree of polymerization such that the intrinsic viscosity is at least 0.8, and the ratio of the birefringence of the surface portion to that of the central portion in the polyester filament is from 1.03/1 to 1.15/1; the twist coefficient is represented by T.times..sqroot.D (wherein T is the average value of the numbers of turn of the single twist and final twist per 10 cam of cord, and D is the denier of the cord); and the dimension unstabilizing factor is defined as the sum of the elongation (%) at a load of 2.3 g/d and the thermal shrinkage (%) when heated at 105.degree. V. in dry air for 30 minutes.
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Miyoshi Shoji
Nomura Ryuichi
Hoch Raymond
Toyo Rubber Industry Co., Ltd.
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