Package easy-to-open for photosensitive material

Details Package easy-to-open for photosensitive material Package easy-to-open for photosensitive material

1997-07-18

2000-05-09

Thibodeau, Paul

Stock material or miscellaneous articles

Hollow or container type article

Nonself-supporting tubular film or bag

428323, 428483, 428515, 428523, 428910, B29D 2200, B32B 2708, B32B 2732, B32B 2736

Patent

active

06060137&

ABSTRACT:
It is provided a package easy-to-open for photosensitive material such as an easy-to-open packaged photosensitive material having at least a biaxially stretched plastic film layer and, as an innermost layer, a heat-sealing layer containing not less than 5 wt % of an ethylene copolymer resin and/or a thermoplastic elastomer. At least one layer of the layered film has light shielding performance, and at least one layer other than the biaxially stretched plastic film layer has a ratio of the tear strength in the direction normal to the flow direction to the tear strength in the flow direction of not less than 3. The package has physical strength such as impact resistance, complete hermetic sealing performance, complete light shielding performance, and amenability of discarding and recycling without affecting the quality of the photosensitive material.

REFERENCES:
patent: 4452846 (1984-06-01), Akao
patent: 4579781 (1986-04-01), Akao
patent: 4925711 (1990-05-01), Akao et al.
patent: 5118563 (1992-06-01), Akao
patent: 5169696 (1992-12-01), Lang et al.
patent: 5294695 (1994-03-01), Lee et al.
patent: 5510177 (1996-04-01), Masuyama et al.
Park, Plastics Film Technology, pp. 26-33, May 1970.
Cowie, Polymers: Chemistry and Physics of Modern Materials, pp. 337-338 1991.

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