Forming an integral closure for a thermoplastic container

Details Forming an integral closure for a thermoplastic container Forming an integral closure for a thermoplastic container

B - Operations, Transporting

29

D

18/746

B29D 7/02 (1980.01)

Patent

CA 1166807

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 con- tainers 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 closely 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. 27,173-F

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