Method of making package for photographic film
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United States of America Patent
Stats
-
Apr 21, 1981
Issued Date -
N/A
app pub date -
Jun 18, 1979
filing date -
Mar 7, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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