Packaging material for photographic photosensitive materials and

Details Packaging material for photographic photosensitive materials and Packaging material for photographic photosensitive materials and

1993-06-18

1996-02-20

Seidleck, James J.

Stock material or miscellaneous articles

Hollow or container type article

Nonself-supporting tubular film or bag

428 353, 428218, 428219, 428213, 428220, 4283157, 4283159, 4283179, 4283184, 4283193, 4283197, 4283199, B29D 2200

Patent

active

054927412

ABSTRACT:
A packaging material for photographic photosensitive materials consisting essentially of a cushioning sheet having a density of less than 0.5 g/cm.sup.3, a wear-resistant heat-resistant flexible sheet having a Young's modulus of not less than 50 kg/mm.sup.2 provided on one side of the cushioning sheet, and a wear-resistant flexible sheet having a Young's modulus of not less than 50 kg/mm.sup.2 provided on the other side of the cushioning sheet, the outer most layer provided on said the other side having heat sealability, and the packaging material having complete light-shielding ability as a whole, and a light-shielding bag for photographic photosensitive materials made by fusion to join the layers having heat sealability in the above packaging material. The packaging material for photographic photosensitive materials can be heat-sealed entirely and can continuously be made into a bag automatically by a simple general purpose heat sealer, such as a heat sealing bar or a heat sealing belt, while retaining its physical strength and at a high productivity.

REFERENCES:
patent: 4337285 (1982-06-01), Akao et al.
patent: 4452846 (1984-06-01), Akao
patent: 4469741 (1984-09-01), Akao
patent: 4565733 (1986-01-01), Akao
patent: 4661395 (1987-04-01), Akao
patent: 4661401 (1987-04-01), Akao
patent: 4906517 (1990-03-01), Akao et al.

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