Microcellular foamed fiber, and a process of preparing for...

Details Microcellular foamed fiber, and a process of preparing for... Microcellular foamed fiber, and a process of preparing for...

2006-08-29

2006-08-29

Edwards, N. (Department: 1774)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

C428S376000

Reexamination Certificate

active

07097905

ABSTRACT:
The present invention discloses microcellular fibers, in which microcells are formed with a density of more than 107cells/cm3with a supercritical fluid introduced into fiber forming polymers and have a rate of volume expansion of 1.2 to 50, ratio of microcell length to microcell diameter of more than 2 and a monofilament diameter of more than 5 μm. The microcellular fibers provide high and uniform cell densities and are good in the rate of volume expansion and the ratio of cell length to cell diameter, thus they are very excellent in lightweight feeling and touch. The microcellular fibers are made by a method for making microcellular fibers, wherein a supercritical fluid is introduced into an extruder upon melting and mixing fiber forming polymers in the extruder, to thus prepare a single-phase solution of molten polymer and gas, then the single-phase solution of molten polymer and gas is extruded (spun) through spinneret of spinning pack by subjecting the single-phase solution to a rapid pressure drop, to thus make microcellular extrusion materials, the microcellular extrusion materials are rapidly cooled by a cooling medium, and then they are wound at a winding speed of 10 to 6,000 m/min so that a spinning draft can be 2 to 300.

REFERENCES:
patent: 5512231 (1996-04-01), Thies et al.
patent: 5762840 (1998-06-01), Tsai et al.
patent: 5886053 (1999-03-01), Park et al.
patent: 6051174 (2000-04-01), Park et al.

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