Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1974-08-13
1977-11-29
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264176F, 264290R, D01D 512
Patent
active
040605825
ABSTRACT:
A method of manufacturing polymethylene filaments, wherein polyoxymethylene having the molecular weight from 30,000 to 100,000 and containing stabilizing additives in a quantity from 0.1 to 3.0 per cent of the weight of the polyoxymethylene is subjected to thermal treatment at a temperature from 100.degree. to 150.degree. C. and residual pressure from 1 to 100 mm mercury to attain constant weight. The thus thermally treated polyoxymethylene is melted at a temperature from 170.degree. to 230.degree. C., whereafter the melt is forced through the orifices of an extrusion nozzle. The jets of the melt, leaving the orifices of the extrusion nozzle, are cooled at a temperature from 70.degree. to 169.degree. C. After the cooling the obtained filaments are drawn at a temperature from 120.degree. to 165.degree. C. to a length exceeding from 7 to 14 times the initial length.
The disclosed method offers a simple technology of producing filaments as strong as 100 grams per tex.
To produce low-shrinkage fiber (i.e. with a shrinkage rate from 0 to 5 per cent at 150.degree. C.) the drawn filaments are thermally treated at a temperature exceeding that of the drawing by 2.degree. C. to 50.degree. C., the filaments being maintained under tension. Alternatively, the drawn filaments may be first tensioned and then thermally treated, as indicated hereinabove.
REFERENCES:
patent: 3219623 (1965-11-01), Bernardinelli
patent: 3235531 (1966-02-01), Walker
patent: 3347969 (1967-10-01), Moelter
patent: 3426754 (1969-02-01), Bierenbaum et al.
Egorov Boris Afanasievich
Fishman Konstantin Evgenievich
Grzhimalovsky Alexandr Sergeevich
Judin Alexandr Vladimirovich
Vernaya Ljudmila Dmitrievna
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