Heat-shrinkable film tube with an internally ribbed closed end,

Details Heat-shrinkable film tube with an internally ribbed closed end, Heat-shrinkable film tube with an internally ribbed closed end,

1979-09-06

1981-09-22

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Simultaneous severing and shaping, or severing while work...

264230, 264296, B29C 2700

Patent

active

042909929

ABSTRACT:
A method for forming a closed end on a tube of heat-shrinkable film wherein the tube is placed over a cylindrical mold with one end of the tube extending beyond top end of the mold, includes forming a pattern of grooves in the mold's top end, and then heating the tube so that it shrinks and tightly contacts and covers the grooved end of the mold. Excess film protruding from the end of the tube which has shrunk against the grooved end of the mold is cut off or folded down and then this end of the tube is pressed with a heated smooth plate against the grooved end of the mold. Excess film material remaining on this end portion of the tube is squeezed into the grooves, whereby the end of the film tube is formed with a uniform thickness and with low thermal stresses thereby reducing any tendency for distortion of the closed end and providing a surface that can be more easily printed on.

REFERENCES:
patent: 3177278 (1965-04-01), Schilling
patent: 3336430 (1967-08-01), Cech
patent: 4108347 (1978-08-01), Amberg
patent: 4115173 (1978-09-01), Qualey

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