Method for texturing synthetic filament yarn
OwnerEckhard C. A. Schwarzinventor
Life of this patent
Estimating the term…
Abstract
In a non-friction texturing process, the filaments of a thermoplastic polymer yarn are heated along spaced zones to form latent crimps in the filaments. The filaments are then drawn and are subsequently heated above the glass transition temperature of the polymer while the filaments are under low enough tension to allow crimps to form in the filaments. The heating along spaced zones is preferably accomplished by passing the filaments over a grooved heating roller.
Claims5
A method of forming latent crimps in synthetic thermoplastic condensation polymer filaments, such as polyethylene terephthalate or polyhexamethylene adipamide, comprising the steps of:
- A. heating discrete spaced zones on one side of molecularly orientable filaments, having a tensile elongation at break of at least 30% to a temperature from about 150 to about 310.degree. C for a time in seconds which is equal to X times denier per filament, where X is a value which falls within the range of 0.002 to 0.00002, and wherein the centers of said zones are spaced from 2 to 50 times the filament thickness, said heating of said zones being affected by guiding the filaments about a rotating grooved heated roll having circumferentially spaced lands generally parallel to the roll axes with the lands spaced 2 to 50 times the thickness of the filament;
- B. subsequently subjecting said filaments to molecular orientation by drawing them to a draw ratio of at least 1.10 by guiding the filaments at a first velocity rate over the grooved roll and drawing the filament away from the grooved roll at a faster second rate.
Dependencies are inferred from the claim text.