Method of forming an integral closure for a thermoplastic contai

Details Method of forming an integral closure for a thermoplastic contai Method of forming an integral closure for a thermoplastic contai

1978-12-15

1981-04-21

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

24201C, 150 3, 156 66, 156 91, 15624424, 15624425, B29D 702

Patent

active

042630797

ABSTRACT:
An improved high speed cast process for fusing fasteners, with strips of film at their base, to separately extruded film or sheet stock for making containers with integral closure means. The process makes available multiple sets of male and female fastener elements, with variable spacing, in a single extrusion operation. The apparatus is configured so that adhesion between the fastener elements and the film or sheet occurs very close to the die lips before significant cooling of the extrudate occurs. Containers with improved profiles are obtained because the base permits the profiles to remain relatively rigid during closing and opening.

REFERENCES:
patent: 3198228 (1965-08-01), Naito
patent: 3338284 (1967-08-01), Ausnit
patent: 3340116 (1967-09-01), Naito
patent: 3403429 (1968-10-01), Smith
patent: 3462332 (1969-08-01), Goto
patent: 3579730 (1971-05-01), Ausnit

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