Method of making package for photographic film

Details Method of making package for photographic film Method of making package for photographic film

1979-06-18

1981-04-21

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

15624412, 206455, 2065245, B29D 702

Patent

active

042630800

ABSTRACT:
A thinner, less-expensive-to-produce, and more easily handled, opaque sheet is formed by coextrusion of two polymeric layers containing relatively low loadings of black pigment around a third layer of polymer which is pigmented at levels higher than would be practical using conventional extrusion processes, rather than a coextrusion procedure. The sheet is an improved product for use in packaging photographic film or like products to be protected from light.

REFERENCES:
patent: 3458033 (1969-07-01), Ariyasu et al.
patent: 3524795 (1970-08-01), Peterson
patent: 4070398 (1978-01-01), Lu

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