Mitsubishi Paper Mills Limited

Dainippon Screen Mfg. Co., Ltd.

Takao Senga

Jun Yamada

Shigeyoshi Suzuki

Sadao Kuriu

Yasuo Tsubai

Akira Furukawa

Hirokazu Yamamoto

Yoshikazu Takaya

Kazuchiyo Takaoka

Isao Kohmura

Masahiro Yamasaki

Eiji Kanada

Hideki Sekiguchi

Tetsuya Ashida

Shoji Yamada

Shigehiko Miyamoto

Mamoru Nakatani

Iwao Hirose

Tomoko Ishimaru

Takimi Hashimoto

Kunio Kasamatsu

Koji Uchida

Akitoshi Kajihara

Masafumi Koishi

Tokubee Maegawa

Masayoshi Wakabayashi

An object of the present invention is to provide an ink jet print system in which quality troubles (e.g. banding and ink overflow) caused by an unsuitable combination of ink and an ink jet recording medium in an ink jet recording apparatus in the case where the ink jet recording medium is an imitation, are obviated on the basis of printing control information obtained from the ink jet recording medium with an information-detecting sensor, and it is possible to prevent the employment of an ink jet recording medium which a user cannot judge to be a genuine product or an imitation. According to the present invention, an ink jet print system can be obtained in which printing information obtained from an image processor and the printing control information of the ink jet recording medium obtained from the information-detecting sensor are processed and on the basis of information of these kinds, the best image is always formed with the ink jet recording apparatus by the use of a genuine product. The printing control information of the ink jet recording medium is preferably a logo print or a cord image print. The ink jet recording medium is preferably of a rolled paper type. The system is stopped when an imitation is used which does not match with the printing control information.

Ink-jet print system

An ink jet recording medium which comprises a support and a layer comprising fine particles of a thermoplastic organic polymer, formed on at least one side of the support, so that said fine particles of a thermoplastic organic polymer are dissolved or melted after ink jet recording to form a layer wherein said fine particles of a thermoplastic organic polymer are fused to one another, wherein said fine particles of a thermoplastic organic polymer have an average particle size within a range of from 1 to 20 &mgr;m.

Ink jet recording medium, apparatus for preparing an ink jet printed product, and ink jet printed product

Ink jet recording sheet

The invention provides a method for cleaning squeeze rollers of a liquid electrophotographic developing apparatus by a cleaning pad which makes it possible to develop an electrophotographic photoreceptor with causing no stains. The method includes the steps of supplying a solvent for liquid developer to a pair of squeeze rollers thereby to clean the rollers with the solvent; isolating the squeeze rollers from each other; and allowing one of the rollers which contacts with photosensitive surface of photoreceptor and the cleaning pad to contact with each other thereby to clean the roller kept isolated from the other squeeze roller by the cleaning pad. The invention further provides a liquid electrophotographic developing apparatus for carrying out the method.

Method and apparatus for cleaning squeeze rollers in liquid

Disclosed is a process of developing images formed on a photosensitive material for electrophotography which does not cause the fogging originated from a pair of squeeze rolls made of materials different from each other and which includes the steps of developing the images with a liquid developer of the positive type containing a compound having a polyoxyethylene group or at least one compound selected from the group consisting of phosphate, sulfate and sulfonate salts having a group soluble in the carrier liquid and free from polyoxyethylene group.

Method of developing electronic photograph with liquid developer and

Disclosed is a process for producing a liquid developer for electrostatic photography which comprises a highly insulating hydrocarbon medium and resin particles dispersed therein, said process comprising polymerizing a monomer (A) soluble in said medium, but insolubilized upon being polymerized in the presence of a polymer (S) insoluble in said medium and having a carboxyl group, a hydroxyl group or an amide group. In this process, a monomer (B) soluble in said medium and still soluble upon being polymerization and/or a monomer (C) having at least two polymerizable unsaturated double bonds may also be polyumerized.

Liquid developer for electrophotography

An electrophotographic plate for making printing plate comprises a conductive support and a light sensitive layer which comprises a photoconductive substance, an alkali soluble resin binder and an organic polymer fine powder of 10 .mu.m or less in particle diameter. According to this electrophotographic plate, dissolving-out of non-image area of the light sensitive layer is promoted and higher printing endurance is provided.

Electrophotographic plate for printing plate making

Disclosed is a method for producing a resin dispersion type electrophotographic liquid developer containing resin particles dispersed in a high insulation hydrocarbon medium which comprises, in the presence of a first polymer dissolved in said medium which is soluble in said medium and has a polar functional group having adsorptivity to a second polymer, polymerizing a monomer having a polar functional group having adsorptivity to said first polymer to produce the second polymer which is low in solubility in said medium and is substantially particle.

Method for producing liquid developer for electrophotography

An apparatus for processing a printing plate which comprises an aluminum base and a photoconductive layer on which a toner image is formed, comprises a rotary brush which is arranged so as to be kept in contact with a processing solution and out of contact with a printing plate. The processing solution supplied on the plate surface is regulated to form an even thick flow.

Processing apparatus for printing plates

A liquid developing apparatus for electrophotograph in which an electrostatic latent image surface of a photoconductive material is confronted with developing electrodes and at the same time is transferred in the liquid toner to be developed, the developing apparatus characterized by comprising a developing chamber defined by a bottom plate held substantially in a horizontal position or slanted with a downstream side in the photoconductive material transferring direction being kept at a lower level, developing electrodes facing the bottom plate at predetermined intervals and forming ceiling plates and side plates, the developing chamber being divided into a front section and a rear section with respect to the photoconductive material transferring direction, an interval between the developing electrode in the front section of the developing chamber and the electrostatic latent image surface being smaller than that between the developing electrode in the rear section of the developing chamber and the electrostatic latent image surface, both end faces on the upstream and downstream sides being opened, and at least one supply passage for the liquid toner being provided at the front section of the developing chamber, between the front and rear sections and/or at a portion of the rear section near to the front section.

Liquid developing apparatus for electrophotography

Disclosed is a method for electrophotographically making a printing plate excellent in resolving power and having a high printing endurance by using a liquid developer containing a copolymer comprising an acrylate ester or methacrylate ester having an alkyl group of 4 or more and a styrene or a styrene derivative, preferably said copolymer additionally containing an acrylate ester or a methacrylate ester having an alkyl group of 3 or less carbon atoms, more preferably said binary or ternary copolymer additionally containing a vinyl monomer having a basic group or an acidic group.

Method for making printing plates

Image recording sheet materials having a relatively hard support, e.g., printing plate sheet materials, can be simply, efficiently, automatically fed to a subsequent step without damaging a photo-sensitive surface by the present feeding method which comprises piling plural units each of which comprises a combination of an image recording sheet material having a relatively hard support and a spacing paper put on said sheet material in such a manner that the leading edge portion of the sheet material protrudes beyond the leading edge of the spacing paper and the trailing edge portion of the spacing paper protrudes beyond the trailing edge of the sheet material and the trailing edge portion of the spacing paper is held so as not to be fed and applying a feeding means to the leading edge portion of said sheet material to feed only the sheet materials to a subsequent step.

Method for feeding recording sheet materials

Disclosed is a method for making a complex layer type lithographic printing plate by forming a toner image on a printing original plate having organic electrophotographic photosensitive layer by electrophotographic process and treating non-image area other than the toner image area with an etching solution mainly composed of an alcohol solvent and/or an alkali solvent, said photosensitive layer being a complex layer type photosensitive layer which comprises a charge carrier generating layer comprising a charge carrier generating substance and a binder mainly composed of a polyamide resin soluble in alcohol solvent and a high molecular substance having compatibility with said resin and having a group soluble in alcohol solvent and/or alkali solvent and a charge carrier transport layer containing a high molecular substance having a group soluble in an etching solution mainly composed of alcohol solvent and/or alkali solvent and thereafter treating non-image area other than the toner image area with the etching solution.

Method for making complex layer type lithografic printing plate

Disclosed is a method for making a printing plate which comprises forming a toner image by electrophotography on a master plate which comprises a base and an organic photo-conductive compound-containing layer, the binder for said organic photo-conductive compound being a half ester resin of a styrene-maleic anhydride copolymer and then subjecting non-image areas other than the toner image areas to an etching treatment with a solution mainly composed of an alkali and/or an alcohol. Thus obtained printing plate is excellent in printing endurance and, besides, can be rapidly etched.

Method for making printing plates employing an organic photo-conductive

Printing characteristics such as ink receptivity and printing endurance of a lithographic printing plate which utilizes as ink receptive areas the photographically formed silver or silver halide image can be improved by treating said printing plate in the presence of a polymer compound containing in its principal and/or side chain an aromatic nucleus bearing a hydrophilic substituent group, said printing plate containing in at least one of its constitutive layers as hydrophilic high molecular weight-binder.

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Nagaokakyo, Japan

Takao Senga