Method for the manufacture of thermoplastic tubular members

Details Method for the manufacture of thermoplastic tubular members Method for the manufacture of thermoplastic tubular members

1981-08-27

1983-10-18

Wityshyn, Michael G.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 733, 156 80, 156251, 156290, 1563084, 429139, 429141, 429145, 429249, B29C 2708, B32B 3118

Patent

active

044103832

ABSTRACT:
A method for manufacturing tubular shaped thermoplastic members comprising conveying two thin sheets of thermoplastic material in close substantially parallel relationship through an ultrasonic welding station for forming a plurality of continuous spaced apart seams substantially parallel to the direction of conveying for joining the two sheets of thermoplastic material. The seams, thus formed, are cut substantially parallel to the direction of conveying such that the two sheets of thermoplastic material remain joined adjacent each side of the cuts. Preferably, the cutting takes place substantially simultaneously with the ultrasonic formation of the seams and the thin sheets of thermoplastic material are cooled prior to the ultrasonic welding. An apparatus for practicing the method is also disclosed. The method and apparatus are particularly adaptable for the manufacture of ionically permeable thermoplastic separators for use in electrochemical cells and the like.

REFERENCES:
patent: 3378429 (1968-04-01), Obeda
patent: 3562041 (1971-02-01), Robertson
patent: 3733238 (1973-05-01), Long et al.
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patent: 3939033 (1976-02-01), Grgach et al.
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patent: 4097327 (1978-06-01), Calemard
patent: 4149288 (1979-04-01), Sendor
patent: 4210998 (1980-07-01), Gaunt
patent: 4220693 (1980-09-01), Di Palma et al.
patent: 4333978 (1982-06-01), Kocher

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