Process for producing composite fibers of side by side type havi

Details Process for producing composite fibers of side by side type havi Process for producing composite fibers of side by side type havi

1979-12-10

1982-02-16

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Layered, stratified traversely of length, or multiphase...

2642108, 2642905, 428373, 428374, B29F 310

Patent

active

043158811

ABSTRACT:
A process for producing side-by-side type composite fibers made of polypropylene-polyethylene which do not have hardly any crimp nor latent crimpability is provided. In said process, a composite spinning is carried out by melt-extrusion by using, as composite components of side by side type, crystalline polypropylene of an intrinsic viscosity (I.V.) of 1.45.about.2.15 and high density polyethylene of I.V. of 0.85.about.1.05 under a condition satisfying the relationship of 10,500.gtoreq.DX V.gtoreq.5,139 (V: take-up speed (m/min); D: denier of taken up unstretched fibers); and stretching the resulting filaments to 3.about.5 times the original length at a temperature of 90.degree. C. or higher.

REFERENCES:
patent: 3505164 (1970-04-01), Oppenlande
patent: 3509013 (1970-04-01), Oppenlande
patent: 3589956 (1971-06-01), Kranz et al.
patent: 3595731 (1971-07-01), Davies et al.

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