Light shielding packaging system for photosensitive web roll

{
  "publication_number": "US6375008B2",
  "country": "US",
  "kind": "B2",
  "title": "Light shielding packaging system for photosensitive web roll",
  "abstract": "A light-shielding packaging for a roll of continuous photosensitive web wound on a core having on its each end a light-shielding flange disc has at its leading end a heat-shrinkable light-shielding leader sheet having a thickness of 30 to 200 mum which shows a heat shrinkage ratio at 50° C. of lower than 1% both in the longitudinal and width directions and a heat shrinkage ratio at 100° C. in the range of 5% to 30% in the longitudinal direction and a heat shrinkage ratio at 100° C. of less than the heat shrinkage ratio in the longitudinal direction by 1% or more in the width direction. 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.",
  "claims": [
    "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 μm and comprising a resin material and a colorant which shows a heat shrinkage ratio at 50° C. of lower than 1% both in the longitudinal and width directions of the web and a heat shrinkage ratio at 100° C. in the range of 5% to 30% in the longitudinal direction and a heat shrinkage ratio at 100° C. of less than the heat shrinkage ratio in the longitudinal direction by 1% or more in the width direction.",
    "2. The photosensitive web of claim 1, wherein the heat shrinkage ratio at 100° C. in the width direction is less than the heat shrinkage ratio in the longitudinal direction by 5% or more.",
    "3. The photosensitive web of claim 1, wherein the leader sheet comprises a heat-shrinkable film placed between a pair of essentially no heat-shrinkable light-shielding films.",
    "4. The photosensitive web of claim 1, wherein the leader sheet comprises an essentially no heat-shrinkable light-shielding film placed between a pair of heat-shrinkable films.",
    "5. The photosensitive web of claim 1, wherein the leader sheet comprises a heat-shrinkable light-shielding film comprising a resin material and a colorant and a heat-resistant layer arranged on at least one surface side of the film, said heat-resistant layer having a softening or decomposing temperature higher than 10° C. of a softening or decomposing temperature of the heat-shrinkable light-shielding film.",
    "6. The photosensitive web of claim 1, wherein the resin material of the leader sheet comprises 5 to 90 weight % of amorphous polyolefin and 95 to 10 weight % of one or more other resin components.",
    "7. The photosensitive web of claim 1, 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.",
    "8. The photosensitive web of claim 7, 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=W width of the inner leader segment=W+2X width of the outer leader segment=W+2Y Y>3X.",
    "9. The photosensitive web of claim 7, wherein the inner leader segment is connected to the outer leader segment via a tapered segment.",
    "10. The photosensitive web of claim 1, 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 photosensitive web.",
    "11. A light-shielding packaging for a roll of continuous photosensitive web wound on a core having on its each end 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 μm and comprising a resin material and a colorant which shows a heat shrinkage ratio at 50° C. of lower than 1% both in the longitudinal and width directions of the web and a heat shrinkage ratio at 100° C. in the range of 5% to 30% in the longitudinal direction and a heat shrinkage ratio at 100° C. of less than the heat shrinkage ratio in the longitudinal direction by 1% or more in the width direction, 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.",
    "12. The light-shielding packaging of claim 11, wherein the heat shrinkage ratio of the leader sheet at 100° C. in the width direction is less than the heat shrinkage ratio in the longitudinal direction by 5% or more.",
    "13. The light-shielding packaging of claim 11, wherein the leader sheet comprises a heat-shrinkable film placed between a pair of essentially no heat-shrinkable light-shielding films.",
    "14. The light-shielding packaging of claim 11, wherein the leader sheet comprises an essentially no heat-shrinkable light-shielding film placed between a pair of heat-shrinkable films.",
    "15. The light-shielding packaging of claim 11, wherein the leader sheet comprises a heat-shrinkable light-shielding film comprising a resin material and a colorant and a heat-resistant layer arranged on at least one surface side of the film, said heat-resistant layer having a softening or decomposing temperature higher than 10° C. of a softening or decomposing temperature of the heat-shrinkable light-shielding film.",
    "16. The light-shielding packaging of claim 11, wherein the resin material of the leader sheet comprises 5 to 90 weight % of amorphous polyolefin and 95 to 10 weight % of one or more other resin components.",
    "17. The light-shielding packaging of claim 11, 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.",
    "18. 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=W width of the inner leader segment=W+2X width of the outer leader segment=W+2Y Y>3X.",
    "19. The light-shielding packaging of claim 17, wherein the inner leader segment is connected to the outer leader segment via a tapered segment.",
    "20. The light-shielding packaging of claim 11, 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 photosensitive web."
  ],
  "cpc": [
    "G03C 3/00",
    "Y10T 428/192",
    "Y10T 428/197"
  ],
  "assignees": [
    "FUJI PHOTO FILM CO LTD"
  ],
  "filing_date": "2000-12-26",
  "publication_date": "2002-04-23",
  "grant_date": "2002-04-23",
  "priority_date": "1998-12-17",
  "application_number": "US-74580500-A",
  "family_id": "27522914",
  "citations": [
    "EP0181417A1",
    "US4911299A",
    "US5222601A",
    "US5346067A",
    "US5411843A",
    "US5472089A",
    "US6048676A",
    "US6095330A"
  ]
}