Process for perforating a solvent soluble stencil
AssigneeRiso Kagaku Corporation
InventorHideo Watanabe
Life of this patent
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Abstract
A stencil printing sheet and a process for perforating the same. The stencil printing sheet is perforated by using a solvent-soluble resin in the range of 0.1-100 .mu.m in thickness with a solvent which has a solubility of 100 seconds or less and a viscosity of solution of 1000 cps or less at 20.degree. C.
Claims5
A process for perforating a stencil printing sheet which comprises a porous substrate and a solvent-soluble resin film laminated thereon, wherein said resin film is of a thickness in the range of 0.1-100 .mu.m, the process comprising the steps of:
- providing said stencil printing sheet;
- contacting a solvent with said solvent-soluble resin film of said stencil printing sheet by feeding said solvent in a non-contact condition from a solvent-ejecting device, to perforate the contacted resin film, wherein said resin is water-soluble or a water-miscible resin selected from the group consisting of polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyvinyl pyrolidone, polyethylene-polyvinyl alcohol copolymer, polyethylene oxide, polyvinyl ether, polyvinyl acetal and polyacrylamide, and said solvent is water or an aqueous solvent and, a viscosity of a solution of said solvent into which said resin is dissolved is 1000 cps or less at 20.degree. C., when 10% of the solution's weight is the dissolved resin.
A process for perforating a stencil printing sheet which comprises a porous substrate and a solvent-soluble resin film laminated thereon, wherein said resin film is of a thickness in the range of 0.1-100 .mu.m, which comprises the steps of:
- providing said stencil printing sheet;
- contacting a solvent with said solvent-soluble resin film of said stencil printing sheet by feeding said solvent in a non-contact condition from a solvent-ejecting device, to perforate the contacted resin film, wherein said resin is selected from the group consisting of polyethylene, polypropylene, polyisobutylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl fluoride, polyvinyl acetate, polyvinyl chloride-polyvinyl acetate copolymer, acrylic resin, polyamide, polyimide, polyester, polycarbonate and polyurethane, and said solvent is at least one solvent selected from the group consisting of an aliphatic hydrocarbon, an aromatic hydrocarbon, an alcohol, a ketone and an ester and an oxide and, a viscosity of a solution of said solvent into which said resin is dissolved, is 1000 cps or less at 20.degree. C., when 10% of the solution's weight is the dissolved resin.
Dependencies are inferred from the claim text.