Process for making cast thermoplastic film with integral closure

Details Process for making cast thermoplastic film with integral closure Process for making cast thermoplastic film with integral closure

1984-03-21

1985-12-31

Schofer, Joseph L.

Plastic and nonmetallic article shaping or treating: processes

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

Forming continuous work followed by cutting

264177R, 425309, 15624418, 83 15, 24 305R, B28B 1116

Patent

active

045620270

ABSTRACT:
An improved cast process and apparatus for fusing closure elements, particularly those with thickened bases, to separately extruded film or sheet stock for making containers with integral reclosable closures. The process is applicable to webs of film which contain more than one pair of closure elements. The web is split immediately adjacent the die exit between adjacent pairs of closure elements to achieve a film having essentially erect closure elements and associated ribs should they be included. The process also permits beaded edges along both sides of the film. Improved containers can thus be produced.

REFERENCES:
patent: 3356556 (1967-12-01), Violette et al.
patent: 3500727 (1970-03-01), Behr et al.
patent: 4062712 (1977-12-01), Stark
patent: 4295919 (1981-10-01), Sutrina et al.

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