Method of heat sealing sheet-form layers of perforated plastic b

Details Method of heat sealing sheet-form layers of perforated plastic b Method of heat sealing sheet-form layers of perforated plastic b

1975-08-29

1978-04-11

Price, William

Special receptacle or package

Article housing attached to panel

206463, 206 4533, 206484, 206489, 206530, 2065341, 206539, 229 48T, B65D 7526, B65D 7530

Patent

active

040834514

ABSTRACT:
Each sheet-form layer of plastic film to be superposed with another layer between layers of non-heat conducting material, such as paperboard, is perforated in a pattern such that, when the layers of plastic are superposed between the layers of normally non-heat conducting material for heat sealing, the perforations of each layer of plastic are aligned with imperforated portions of the superposed perforated layer of plastic. When sealing heat and pressure are applied to the superposed layers of plastic and paperboard or the like by conventional heated dies, each layer of plastic is rapidly sealed to the inner surface of both layers of paperboard, or, if initially sealed to the inner surface of one layer, is rapidly sealed directly to the inner surface of the other layer of paperboard. The article display package encloses an article between two sealed layers of sheet-form plastic forming transparent windows in openings of two superposed layers of paperboard to each of which both layers of plastic are also sealed.

REFERENCES:
patent: 2461660 (1949-02-01), Salfisberg
patent: 2780353 (1957-02-01), Volckening
patent: 3054503 (1962-09-01), Hartman, Jr. et al.
patent: 3203541 (1965-08-01), Rein
patent: 3217871 (1965-11-01), Lee
patent: 3302773 (1967-02-01), Weir et al.
patent: 3494322 (1970-02-01), Dubbels
patent: 3669256 (1972-06-01), Jacob
patent: 3809217 (1974-05-01), Harrison

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