Packaging material for photosensitive materials

Abstract

A laminate film of at least three layers comprising a foam-sheet sandwiched between two uniaxially molecular oriented thermoplastic resin films, wherein; (a) the thickness of the foam-sheet is 0.3-2.0 mm, and the foaming magnification is 5-50 times; (b) the two uniaxially molecular oriented films are so hot-welded to the both surfaces of the foam-sheet, optionally via a hot-melting adhesive layer, that the respective molecular orientation axes cross each other at an angle of 30 degrees or more; and (c) the thickness of the hot-welded laminate film has been compressed to 40-85% (thickness retention) of the theoretical sum of each layer. The laminate film preferably contains a light-shielding substance, or light-shielding layer(s) may further be coated thereon, for the use of packaging photosensitive materials.

Dependencies are inferred from the claim text.