D - Textiles – Paper – 01 – D
Patent
D - Textiles, Paper
01
D
18/626
D01D 5/26 (2006.01) D01D 5/092 (2006.01) D01F 6/60 (2006.01)
Patent
CA 1165071
TITLE OF INVENTION CHIP-FREE STAPLE FIBER PROCESS ABSTRACT OF THE DISCLOSURE An equilibrium melt from a standard hydrolytic or anionic polymerization of caprolactam is spun at a temperature between about 230 and 270°c through a spinnerette, preferably one having a multiplicity of holes spaced from each other in an asymmetric arrangement, the spinning take-away speed being less than about 250 meters/minute. The molten strands of polycaprolactam are quenched in two phases: (1) gas at a temperature of less than 20°c is directed from a first entrance in a crosscurrent flow upon the face of the spinnerette and upon the molten polycaprolactam strands immediately adjacent thereto, and is exhausted adjacent to the back of the spinnerette; and (2) gas at a temperature of less than 20°c is directed in a countercurrent flow from a second entrance downstream from the first entrance with respect to the direction of movement of the polycaprolactam strands; whereby the surface temperature of the polycaprolactam strands is reduced to 30-70°c. A drawing and crimping lubricant and antistatic agent is then applied to the surface of the polycaprolactam strands which are then drawn at a total draw ratio between 3 and 5. The polycaprolactam strands are then crimped and cut into staple lengths, which are subsequently washed in multiple stages, dried, and packaged for subsequent use or sale.
384158
Berg Gerald A.
Buchert Hermann
Duffy Steve R.
Harder Richard E.
Higgs Ernest R.
Badische Corporation
Gowling Lafleur Henderson Llp
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