Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – To form particulate product
Patent
1980-08-21
1982-12-07
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
To form particulate product
2642108, 264233, 264237, 425 72S, D01D 910
Patent
active
043626823
ABSTRACT:
An equilibrium melt from a standard hydrolytic or anionic polymerization of caprolactam is spun at a temperature between about 230.degree. and 270.degree. 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.degree. 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.degree. 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.degree.-70.degree. 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.
REFERENCES:
patent: 3046083 (1962-07-01), Bates et al.
patent: 3213171 (1965-10-01), Kilian
patent: 3271943 (1966-09-01), Williams
patent: 3705227 (1972-12-01), Fintel et al.
patent: 4045534 (1977-08-01), Fisher et al.
patent: 4227906 (1980-10-01), Rieser
Reyon & Synthetica Zellwolle, vol. 29, (1951), pp. 9-22.
Berg Gerald A.
Buchert Hermann
Duffy Steve R.
Harder Richard E.
Higgs E. R.
Badische Corporation
Helfrich George F.
Woo Jay H.
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