Method of making a fleece or mat of thermoplastic polymer filame

Details Method of making a fleece or mat of thermoplastic polymer filame Method of making a fleece or mat of thermoplastic polymer filame

1996-01-11

1997-03-11

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421087, 2642902, 425 722, B29C 4788, B29C 5516

Patent

active

056098081

ABSTRACT:
A melt-blowing head is used to produce long thermoplastic filaments which are collected on a sieve belt and form crossing welds at cross-over points. The resulting mat may be calendered and is composed of filaments having a diameter of less than 100 .mu.m and a degree of crystallinity which is less than 45%. The mat is heated to a stretching temperature of 80 to 150.degree. C. and is then biaxially stretched by 100 to 400% before being thermally fixed at a higher temperature. The result is a nonwoven web which can have a greater strength for a given area weight or a reduced area weight for a given strength than earlier systems.

REFERENCES:
patent: 3855045 (1974-12-01), Brock
patent: 4340563 (1982-07-01), Appel et al.
patent: 4405297 (1983-09-01), Appel et al.
patent: 5248247 (1993-09-01), Rubhausen et al.
patent: 5296289 (1994-03-01), Collins
patent: 5460500 (1995-10-01), Geus et al.

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