Ricoh Company, Ltd.

Tohoku Ricoh Co., Ltd.

Other

Takehiko Iwaoka

Masanori Rimoto

Yuji Natori

Fumiaki Arai

Hiroshi Tateishi

Tetsuo Tanaka

Masayuki Ohta

Hideki Ono

Tsutomu Ishida

A thermosensitive stencil paper having a thermoplastic resin film and a porous resin layer which is provided on the thermoplastic resin film by coating a porous resin layer formation coating liquid including a water-in-oil emulsion of a resin on the thermoplastic resin film and drying the coating liquid. In addition, the method of producing the above-mentioned thermosensitive stencil paper is also disclosed.

Thermosensitive stencil paper and method of producing the same

A heat-sensitive stencil having a thermoplastic resin film, and a porous resin layer formed thereon. The stencil has an air permeability in the range of 1.0 cm /cm &middot;sec to 157 cm /cm &middot;sec in a portion thereof when the thermoplastic resin film of the portion is perforated to form perforations providing an open ratio S /S of at least 0.2, wherein S represents a total area of the perforations and S represents the area of the portion. The heat-sensitive stencil is prepared by applying a coating liquid containing the resin of the porous resin layer to the thermoplastic resin film and drying the coating. The coating liquid contains a mixture of a good solvent and a poor solvent less vaporizable than the good solvent so that the porous resin layer is formed after drying.

Heat-sensitive stencil and method of fabricating same

A heat-sensitive stencil having a thermoplastic resin film, and a porous resin layer formed thereon. The stencil has an air permeability in the range of 1.0 cm.sup.3 /cm.sup.2 .multidot.sec to 157 cm.sup.3 /cm.sup.2 .multidot.sec in a portion thereof when the thermoplastic resin film of the portion is perforated to form perforations providing an open ratio S.sub.O /S.sub.P of at least 0.2, wherein S.sub.O represents a total area of the perforations and S.sub.P represents the area of the portion. The heat-sensitive stencil is prepared by applying a coating liquid containing the resin of the porous resin layer to the thermoplastic resin film and drying the coating. The coating liquid contains a mixture of a good solvent and a poor solvent less vaporizable than the good solvent so that the porous resin layer is formed after drying.

A method whereby a large number of copies can be produced from a single electrostatic latent image formed on one of a dielectric member, an insulating member or photoconductive member by developing and printing the image by transfer printing in successive operations. The absolute value of a bias voltage impressed on the developing device in developing the electrostatic latent image is gradually reduced until the number of copies produced reaches a specific level, and then progressively increased as the number of copies produced increases for producing copies in numbers which exceed the specific level, whereby copies of a number greater than the number of the specific level can be produced from the same electrostatic latent image.

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Kanagawa, Japan

Takehiko Iwaoka