초록 ▼

A light-shielding packaging for a roll of continuous photosensitive web wound on a core having on its both ends a light-shielding flange disc has at its leading end a heat-shrinkable light-shielding leader sheet having a thickness of 30 to 200 .mu.m which shows a heat shrinkage ratio of 5 to 30% in

A light-shielding packaging for a roll of continuous photosensitive web wound on a core having on its both ends a light-shielding flange disc has at its leading end a heat-shrinkable light-shielding leader sheet having a thickness of 30 to 200 .mu.m which shows a heat shrinkage ratio of 5 to 30% in the longitudinal direction of the web at a temperature in the range of 60 to 140.degree. C. and a heat shrinkage ratio of less than 5% in its width direction at the same temperature. The leader sheet has a length larger than the length of the outermost convolution of the roll and a width larger than the distance between the outer face of one flange disc and the outer face of another flange disc, and each side portion of the leader sheet is light-tightly attached by heat shrinkage to the outer face of the flange disc at least at a portion adjacent to the periphery of the flange disc.

대표청구항 ▼

[ What is claimed is:] [1.] A continuous photosensitive web having at least at its one end a heat-shrinkable light-shielding leader sheet having a thickness of 30 to 200 .mu.m and comprising a resin material and a colorant which shows a heat shrinkage ratio in the range of 5 to 30% in the longitudin

[ What is claimed is:] [1.] A continuous photosensitive web having at least at its one end a heat-shrinkable light-shielding leader sheet having a thickness of 30 to 200 .mu.m and comprising a resin material and a colorant which shows a heat shrinkage ratio in the range of 5 to 30% in the longitudinal direction of the web at a temperature in the range of 60 to 140.degree. C. and a heat shrinkage ratio of less than 5% in its width direction at that temperature. [13.] A light-shielding packaging for a roll of continuous photosensitive web wound on a core having on its both ends a light-shielding flange disc, which has at its leading end a heat-shrinkable light-shielding leader sheet having a thickness of 30 to 200 .mu.m and comprising a resin material and a colorant which shows a heat shrinkage ratio in the range of 5 to 30% in the longitudinal direction of the web at a temperature in the range of 60 to 140.degree. C. and a heat shrinkage ratio of less than 5% in its width direction at the temperature, said leader sheet having a length larger than the length of the outermost convolution of the roll and a width larger than the distance between the outer face of one flange disc and the outer face of another flange disc, and each side portion of the leader sheet being light-tightly attached via heat shrinkage thereof to the outer face of the flange disc at least at a portion adjacent to the periphery of the flange disc. The light-shielding packaging of claim 13, wherein a ratio of the heat shrinkage ratio of the leader sheet in the longitudinal direction to the heat shrinkage ratio in the width direction of the leader sheet is 3 or more. The light-shielding packaging of claim 13, wherein the resin material of the leader sheet comprises 5 to 90 weight % of an amorphous polyolefin and 95 to 10 weight % of one or more other resin components. The light-shielding packaging of claim 13, wherein the leader sheet comprises a heat-shrinkable plastic film and a light-shielding film comprising a resin material and a colorant which is arranged on each surface side of the heat-shrinkable plastic film. The light-shielding packaging of claim 13, wherein the leader sheet consists essentially of an inner leader segment having a width larger than the width of the photosensitive web and an outer leader segment having a width larger than the width of the inner leader segment. The light-shielding packaging of claim 17, wherein the width of the photosensitive web, the width of the inner leader segment, and the width of the outer leader segment satisfy the following conditions:width of the photosensitive web=Wwidth of the inner leader segment W+2Xwidth of the outer leader segment W+2YY>3X. The light-shielding packaging of claim 17, wherein the inner leader segment is connected to the outer leader segment via a tapered segment.