Process for producing a web of thermoplastic polymer filaments

Details Process for producing a web of thermoplastic polymer filaments Process for producing a web of thermoplastic polymer filaments

1996-01-16

1998-03-24

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156181, 156229, 2642108, 2642902, 2642905, D04H 316

Patent

active

057308217

ABSTRACT:
A process for producing a web fleece of thermoplastic polymer filaments. Filaments of thermoplastic polymer are spun from a spinneret to form a curtain passing through a cooling chamber and a stretching channel. The volume rate of flow of the thermoplastic polymer from the spinneret, the volume rate of flow of air, the velocity of the air and the temperature of the air in the cooling chamber and stretching channel are so controlled that individual filaments of the curtain have filament diameters less than .mu.m and a degree of crystallinity less than 45%. The filaments of the curtain are collected on a continuously moving sieve belt in a mat whose crossing points fuse together. The mat is heated to a stretching temperature of 80.degree. to 150.degree. C. and stretched axially by 100 to 400%. The biaxially stretched mat is heated to a temperature above that of the stretching temperature to thermofix the web.

REFERENCES:
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patent: 3912567 (1975-10-01), Schwartz
patent: 3949128 (1976-04-01), Ostemeier
patent: 4340563 (1982-07-01), Appel et al.
patent: 4405297 (1983-09-01), Appel et al.
patent: 5244724 (1993-09-01), Antonacci et al.
patent: 5296289 (1994-03-01), Collins
"Verfahren zur Herstellung von Filamentgarnen aus thermoplastischen Polymeren", ITB Garn- und Flachenherstellung, Feb. 1994, Dr. Klaus Meier, pp. 8-11.

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