Method of manufacturing polyoxymethylene filaments

Details Method of manufacturing polyoxymethylene filaments Method of manufacturing polyoxymethylene filaments

D - Textiles, Paper

01

F

18/617

D01F 6/62 (2006.01)

Patent

CA 1040372

ABSTRACT OF THE DISCLOSURE 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 poly- oxymethylene is subjected to thermal treatment at a temperature from 100°C to 150°C and pressure from 1 to 100 mm mercury to attain constant weight. The thermally treated polyoxymethylene is melted at a temperature from 170°C to 230°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 to a temperature from 70°C to 169°C. After the cooling the obtained filaments are drawn at a temperature from 120°C to 165°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 fibre (i.e. with a shrinkage rate from 0 to 5 per cent at 150°C) the drawn filaments are thermally treated at a temperature exceeding that of the drawing by 2°C to 50°C, the filaments being maintained under tension. Alternatively, the drawn filaments may be first tensioned and then thermally treated.

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