Self-crimping polyester yarn

Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Of varying cross-sectional area or with intermittent...

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Details

264103, 264168, 264177F, 264342RE, D01D 520

Patent

active

045620296

ABSTRACT:
Polyester polymer is extruded at different speeds through groups of parallel closely spaced orifices at relatively high spinning speeds. The resulting filament have high and low shrinkage regions substantially regularly spaced apart along their length. A yarn including a number of these filaments spontaneously develops crimp when relaxed.

REFERENCES:
patent: 3219739 (1965-11-01), Breen et al.
patent: 3914488 (1975-10-01), Gorrafa
patent: 4332757 (1982-06-01), Blackmon et al.
patent: 4332758 (1982-06-01), Blackmon et al.
patent: 4351147 (1982-09-01), Blackmon et al.

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