Process for making sheet-formed reticulated fibrous structures

Details Process for making sheet-formed reticulated fibrous structures Process for making sheet-formed reticulated fibrous structures

1974-04-29

1976-05-04

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264210R, 264DIG8, 264DIG47, 428105, B29D 2700

Patent

active

039549283

ABSTRACT:
A process for the preparation of unopened sheet-formed and reticulated fibrous structures, which comprises:
A. extruding a molten thermoplastic resin containing a foaming substance through a die with a slit clearance of 0.1 - 1.0mm;
B. quenching the extrudate at a point less than 5mm away from the die surface to a temperature below the glass transition temperature of the resin; and
C. simultaneously drafting the extrudate at a draft ratio between the maximum draft ratio possible under the conditions and one-third thereof, thereby fibrillating the extrudate just as it leaves the die exit.

REFERENCES:
patent: 3539666 (1970-11-01), Schirmer
patent: 3549470 (1970-12-01), Greenwald et al.
patent: 3562369 (1971-02-01), Chopra et al.

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