Pretreatment of thermoplastic film for improved sealing

Details Pretreatment of thermoplastic film for improved sealing Pretreatment of thermoplastic film for improved sealing

1977-03-02

1978-01-24

Drummond, Douglas J.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156322, 156497, 156515, B32B 3100, B65C 925

Patent

active

040702227

ABSTRACT:
A method is provided for the pretreatment of superposed layers of thermosplastic film which are to be heat sealed together, longitudinally, along a predetermined area. The film layers to be heat sealed are preheated utilizing heated air along a defined, continuous longitudinally extending area of the film layers. The preheated area is subsequently passed through a slit-seal device which simultaneously severs the preheated film layers and seals the severed edges together. The method is particularly useful for the slit-sealing of a continuously advancing flattened tube of thermoplastic which is characterized by having a non-uniform gauge in cross-section.

REFERENCES:
patent: 2805700 (1957-10-01), Klasing et al.
patent: 2990875 (1961-07-01), Samuels et al.
patent: 3156010 (1964-11-01), Osborn, Jr.
patent: 3269278 (1966-08-01), Olstad
patent: 3749635 (1973-07-01), Lagain
patent: 3839126 (1974-10-01), Haller

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