Package for photographic film and material and powders for makin

Details Package for photographic film and material and powders for makin Package for photographic film and material and powders for makin

1977-03-07

1979-11-13

Smith, Robert I.

Special receptacle or package

For roll or reel

2065242, B65D 8500

Patent

active

041740386

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: 4070398 (1978-01-01), Lu

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