Process for obtaining polyamide yarns with better output efficie

Details Process for obtaining polyamide yarns with better output efficie Process for obtaining polyamide yarns with better output efficie

1992-05-21

1993-08-24

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421114, D01F 110, D01F 626

Patent

active

052386376

ABSTRACT:
Process for improving the output efficiency during the spinning of a polyamide-based preoriented yarn at a speed of at least 4000 m/min by introduction, before the spinning, of a quantity of 0.05 to 1% by weight of pyrogenic silica of particle size of between 5 and 15 nm into the molten polymer in the form of dispersion in a master mix of the same polyamide as than intended to be processed, the filaments after spinning being then cooled by means of a gas stream at room temperature and then sized and wound at a speed of between 4200 and 5800 m/min.
The preoriented yarns thus prepared exhibit a delay in the orientation and are obtained with a gain in output efficiency of at least 10%, generally at least 15%.

REFERENCES:
patent: 2385890 (1945-10-01), Spanagel
patent: 2818173 (1958-01-01), Dithmar
patent: 3994121 (1976-11-01), Adams
World Patent Index, Section CH, week 7844, Derwent Publications (GB), Class A, AN 78-79190a (& JP-A-53 111 121) (1978).

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