| abstract |
A packaging material for photographic photosensitive materials consisting essentially of a cushioning sheet having a density of less than 0.5 g/cm3, a wear-resistant heat-resistant flexible sheet having a Young's modulus of not less than 50 kg/mm2 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/mm2 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. |