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US 5,607,737 AGranted
Sheet stack
AssigneeMinnesota Mining and Manufacturing Company
InventorsElmer Blackwell, John J. Emmel, Harry A. Loder
Life of this patent
Estimating the term…
Abstract
A stack of pre-cut sheets and a dispenser for those sheets are disclosed. The sheets include different adhesion levels to afford individual dispensing of the sheets.
Claims4
A stack of successive sheets disposed one on top of another, said stack ultimately including at least a first, uppermost sheet, a second sheet beneath and adjacent the uppermost sheet and a third sheet beneath and adjacent the second sheet, each of said sheets comprising:
- a backing having first and second opposite major side surfaces and first and second opposite ends with the first end of each sheet in alignment with the second end of an adjacent sheet in said stack, and an adhesive generally permanently adhered adjacent to the first major side surface of said sheet backing with at least some adhesive generally adjacent the first and second ends of each of said sheets, the adhesive of each sheet releasably adhering said sheet along the second major side surface of the adjacent sheet in said stack;
- at least two of said sheets each comprising:
- a premium release low adhesion backsize (LAB) adjacent said second major side surface and generally adjacent said first end of a sheet for providing a first adhesion level between the adhesive of an adjacent upper sheet in the stack and the sheet with the premium release low adhesion backsize (LAB),
- a medium release low adhesion backsize (LAB) adjacent said second major side surface and generally adjacent said second end of the sheet for providing a second adhesion level between the adhesive of an adjacent upper sheet in the stack and the sheet with the medium release low adhesion backsize (LAB);
- said first adhesion level providing a sufficiently low release force between the adhesive of the second sheet and the second major side surface of the third sheet to afford sliding movement between portions of the first and second sheets relative to the third sheet,
- said second adhesion level providing a release force that is greater than said low release force to firmly adhere a portion of the first sheet to the second sheet during the sliding movement of the portions of the first and second sheets relative to the third sheet, and
- wherein said second adhesion level affords peeling away of said first sheet from said second sheet.
4 more elements
A stack of successive sheets disposed one on top of another, said stack ultimately including at least a first, uppermost sheet, a second sheet beneath and adjacent the uppermost sheet and a third sheet beneath and adjacent the second sheet, each of said sheets comprising:
- a backing having first and second opposite major side surfaces and first and second opposite ends with the first end of each sheet in alignment with the second end of an adjacent sheet in said stack, and an adhesive generally permanently adhered adjacent to the first major side surface of said sheet backing with at least some adhesive generally adjacent the first and second ends of each of said sheets, the adhesive of each sheet releasably adhering said sheet along the second major side surface of the adjacent sheet in said stack;
- at least two of said sheets each comprising:
- a first coating of pressure sensitive adhesive adjacent said first major side surface and generally adjacent said first end of a sheet for providing a first adhesion level between the second major side surface of an adjacent lower sheet in the stack and the sheet with the first coating of pressure sensitive adhesive,
- a second coating of pressure sensitive adhesive adjacent said first major side surface generally adjacent said second end of the sheet for providing a second adhesion level between the second major side surface of an adjacent lower sheet in the stack and the sheet with the second coating of pressure sensitive adhesive;
- said first adhesion level providing a sufficiently low release force between the adhesive of the second sheet and the second major side surface of the third sheet to afford sliding movement between portions of the first and second sheets relative to the third sheet,
- said second adhesion level providing a release force that is greater than said low release force to firmly adhere a portion of the first sheet to the second sheet during the sliding movement of the portions of the first and second sheets relative to the third sheet, and
- wherein said second adhesion level affords peeling away of said first sheet from said second sheet.
4 more elements
Dependencies are inferred from the claim text.