Method and apparatus for producing polyester fiber
AssigneeToray Industries, Inc.
InventorsKunihiko Ueda, Shuko Arakane, Takao Sano, Yuhei Maeda
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Abstract
This invention relates to a method and apparatus for producing a polyester fiber which cools a plurality of molten polyester fibers from a spinnert 2 to a temperature below a glass transition point, then takes up the fibers by a non-heating first godet roller at a take-up speed less than 4,000 m/min, heat-stretching the fibers between the first godet roller and a non-heating second godet roller 10 inside a normal pressure steam atmosphere (first heat-treating device 8) higher than the glass transition point of the polyester fiber, and heat-treats the fiber by a pressurized steam atmosphere (second heat-treating device 9) higher than 105.degree. C.
Claims24
A method of producing a polyester fiber comprising:
- cooling a plurality of polyester fibers melt-spun from a spinneret to a temperature below a glass transition point;
- taking up said fibers at a take-up speed of less than 4,000 m/min by a non-heating first godet roller;
- heat-drawing said fibers between said first godet roller and a non-heating second godet roller in a normal pressure steam atmosphere at a temperature above the glass transition point of said polyester fiber;
- and
- heat-treating said fibers in a pressurized steam atmosphere at a temperature not lower than 105.degree. C.
An apparatus for producing a polyester fiber comprising:
- a melt-spinning portion for spinning a plurality of polyester fibers from a spinneret;
- a chimney for cooling said fibers spun from said melt-spinning portion to a temperature below a glass transition point;
- a non-heating first godet roller for taking up said fibers cooled by said cooling chimney at a take-up speed of less than 4,000 m/min;
- a non-heating second godet roller for drawing said fibers, rotating at a higher peripheral speed than said first godet roller;
- a first heat-treating device for heating said fibers to a temperature above the glass transition point inside a normal pressure steam atmosphere between said first and second godet rollers;
- and
- a second heat-treating device for heat-treating said fibers to a temperature not lower than 105.degree. C. inside a pressurized steam atmosphere, disposed downstream of said first heat-treating device.
Dependencies are inferred from the claim text.