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US 4,661,401 AGranted
Laminated films
AssigneeFuji Photo Film Co., Ltd.
InventorMutsuo Akao
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AssigneeFuji Photo Film Co., Ltd.
InventorMutsuo Akao
Estimating the term…
A laminated film comprising a foamed sheet, having a molecularly-oriented thermoplastic resin film layer laminated onto one side of the foamed sheet and a low-pressure-processed, linear low-density polyethylene (L-LDPE) film layer laminated onto the other side of the foamed sheet, wherein: said foamed sheet has a thickness of 0.3 to 2.0 mm and a foaming magnification of 5 to 50 times, said molecularly-oriented thermoplastic resin film has a thickness of 5 to 120 microns, and said L-LDPE film layer has a thickness of 13 to 120 microns, the latter two being melt-bonded to each sides of said foamed sheet through adhesive layers, respectively; and the resultant laminated film has a thickness reduced to 25 to 85% of the theoretical sum of the individual original layers. The laminated film may comprise light shielding substance, which is suitable for packaging photosensitive materials.
A laminated film comprising a foamed sheet, a molecularly-oriented thermoplastic resin film layer laminated onto one side of the foamed sheet and a low-pressure-processed, linear low-density polyethylene (L-LDPE) film layer laminated onto the other side of the foamed sheet, wherein:
A laminated film as defined in claim , in which said L-LDPE film layer comprises at least a polyethylenic polymer and 0.3% by weight or more of a light-shielding substance, 45% by weight or more of said polyethylenic polymer being a low-pressure-procesed, linear low-density polyethylene (L-LDPE), and the balance being at least one thermoplastic resin other than L-LDPE.
Dependencies are inferred from the claim text.