General Company Limited

Ricoh Company, Ltd.

Masaru Kimura

Seita Suzuki

Fumiaki Arai

A stamp includes an ink supply member capable of exchangeably affixing an engraved thermal stencil paper which is engraved by means of a thermal head, and a stamp holder wherein the engraved thermal stencil paper attached to the ink supply member is received so as to oppose the stamping opening. The thermal stencil paper is constructed by layering a film which melts with heat and a porous supporting member. The ink supply member is constructed by impregnating an open-pored microporous structure with ink having a viscosity of 1,000 to 100,000 CPS and 2.5 or less on the Thixotropy Index. The thermal stencil paper, along with a transport-assistant tape to reinforce the thermal stencil paper, are rolled onto a core in a double layer. Stamping quality can be further improved by providing the thermal stencil paper with a water-repellent oil-repellent layer, by making the microporous structure impermeable to ink on surfaces other than the surface in contact with the thermal stencil paper, or by rolling the thermal stencil paper onto the core without an adhesive agent.

Stamp and stamp cassette

A stamp cassette includes a thermal stencil paper and a transport-assistant tape housed in a stamp cassette housing. The thermal stencil paper and the transport-assistant tape are wound together in two layers about a core in the stamp cassette housing.

Stamp cassette for thermal stencil paper

A thermal stencil paper for mimeograph comprising a porous support and a plastic film laminated on each other. The thermal stencil paper for mimeograph of this invention contains a novel release layer on the plastic film. The release layer is composed of a specific graft polymer whose branch polymer comprises a fluorocarbon or silicone resin. The graft polymer is prepared by copolymerizing a radically polymerizable monomer constituting a backbone polymer of said graft polymer and a radically polymerizable fluorocarbon or silicone prepolymer which has a polymerizable double bond at one terminal end of its polymer chain.

Growing community of inventors

Shiga-ken, Japan

Masaru Kimura