Method and apparatus for sealing a tube of thermoplastics materi

Details Method and apparatus for sealing a tube of thermoplastics materi Method and apparatus for sealing a tube of thermoplastics materi

1979-03-23

1981-01-06

Goolkasian, John T.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

53477, B29C 2708, B65B 5110

Patent

active

042434483

ABSTRACT:
A method of sealing a tube of flexible thermoplastics material by welding in which opposite sides of the tube are pressed flat between two jaws. The flattened tube thus has two opposed flat walls which have inner faces in contact, and these flat walls are connected at two opposite edges by folds caused by the flattening of the tube. The jaws are maintained a fixed distance apart, and one is rapidly reciprocated along its longitudinal direction by a vibrator, relatively to the other jaw. This causes the contacting flat walls to rub and become so heated by friction that the contacting plastics faces melt. These molten areas unite in a weld when reciprocation of the jaw is stopped and the plastics cools.

REFERENCES:
patent: 3468731 (1969-09-01), Obeda
patent: 4119449 (1978-10-01), Gould et al.

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