Process of making polyester multifilament yarn

Details Process of making polyester multifilament yarn Process of making polyester multifilament yarn

2006-06-06

2006-06-06

Tentoni, Leo B. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

With twining, plying, braiding, or textile fabric formation

C264S130000, C264S210700, C264S210800, C264S211140, C264S211170, C264S235600

Reexamination Certificate

active

07056461

ABSTRACT:
A method of producing a polyethylene terephthalate-based polyester fiber includes spinning polyethylene terephthalate based polyester to produce an undrawn yarn with an intrinsic viscosity of 0.83 or more and a density of 1338 g/cm3or more, multi-stage drawing the undrawn yarn, heat-setting the drawn yarn, relaxing heat-set yarn, and winding the relaxed yarn to produce the resulting drawn yarn with an intrinsic viscosity of 0.83 or more and a density of 1.38 to 1.3865 g/cm3, so that the thusly produced industrial polyester yarn with high modulus and low shrinkage contributes to significantly improving strength retention (tenacity of a dip cord/tenacity of a grey yarn) of the dip cord, produced by treating the polyester yarn with an adhesive (RFL) and subsequently heat-treating the RFL-treated polyester yarn, to be useful as a tire cord.

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patent: 07-070819 (1995-03-01), None

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