Packaging material for photosensitive materials

Details Packaging material for photosensitive materials Packaging material for photosensitive materials

1989-02-17

1991-06-25

Buffalow, Edith

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

428 346, 428516, B32B 702

Patent

active

050265946

ABSTRACT:
Two packaging materials for photosensitive materials characterized by utilizing linear low density polyethylene (L-LDPE) resin having a specific character.
One packaging material is a thick coextruded multilayer film comprising an L-DLPE resin film layer mainly composed of an L-LDPE resin specified by the density and the melt index (MI) and a polyethylene resin film layer blended with a medium or high density polyethylene resin having a high MFR, Melt fracture and blocking do not occur, and the film is excellent in flexibility, in spite of being a thick film.
The other packaging material is a single layer film of a light-shielding L-LDPE resin film layer characterized by the combination of two kinds of L-LDPE resin. The packaging material is excellent in all physical strength, particularly tear strength and impact puncture strength, antiblocking property, antistatic properties, heat sealing properties and bag-making ability. The generations of lumps and fish eyes are rare, and the film moldabily is excellent.

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