Dai Nippon Insatsu Kabushiki Kaisha

Tokyo Ohka Kogyo Kabushiki Kaisha

Eiichi Tachibana

Shinichi Hikosaka

Koushou Murayama

Kenzo Isumi

Toshimi Aoyama

Hiroyuki Tohda

Tetsuro Katsuta

Bonpei Kato

A gravure printing cylinder is formed by fitting a printing sleeve over a core roll via a layer of a hotmelt adhesive. A gravure printing surface with ink-retaining cells is formed on the printing sleeve either before or, preferably, after the mounting of the sleeve on the core roll. For assemblage of the printing cylinder the hotmelt is applied in the molten state to at least part of at least either of the opposed surfaces of the printing sleeve and the core roll. Then the printing sleeve is placed over the core roll, preferably while both sleeve and roll are being heated. The printing cylinder can be readily disassemblaged by remelting the hotmelt layer. Also disclosed herein is an apparatus for the assemblage and disassemblage of the printing cylinder, including a roll holder for holding the core roll in an upstanding attitude while the core roll is being heated by a heating medium circulating therethrough. As a hotmelt applicator removably mounted on a carriage travels down the upstanding core roll to coat same with a hotmelt adhesive, a sleeve mounting pusher removably mounted on another carriage pushes the printing sleeve down onto the adhesive-coated core roll. A sleeve dismounting pusher is to be mounted on either of the carriages for pushing up the printing sleeve off the core roll.

Sleeve-type gravure printing cylinder and method and apparatus for its

Method of mounting a removable printing sleeve on a core utilizing a hot

In a one-bath etching process in which gravure cells are formed in the surface of a gravure cylinder with one kind of etching solution having a predetermined density, in order to control the cell depths by suitably selecting the cylinder speed, data is provided by correlating a permeation characteristic which is obtained by an inspecting solution substantially similar in characteristic to the etching solution to that which is obtained by the etching solution, while data is obtained by correlating to cylinder speeds, and these data are compared with data which are obtained from the resist layer of the cylinder which is to be used for printing, to determine the total etching time and the cylinder speeds.

One-bath etching method for processing gravure plate, and etching

A method and an apparatus for fabricating gravure printing cylinders of synthetic resin in which a photosetting polyamide resin used as a solution of a coating resin is applied over the surface of a cylindrical base spirally as successively overlaid layers and thereafter the applied resin is subjected to drying by a heater and to photosetting by irradiation with ultraviolet rays, electron rays or the like. The resin layer surface thus obtained is mechanically engraved by an electronic engraver for forming gravure cells. The irradiation of ultraviolet ray, electron ray, or the like may be effected during or after application of the polyamide resin over the cylindrical base. The apparatus comprises a resin solution retainer closely adjacent to the cylindrical base. A substantially vertical lever pivoted for movement toward and away from the base supports the solution retainer. The lever may be moved by an element such as a motor-driven eccentric cam.

Apparatus for fabricating gravure printing cylinders with synthetic

A process for producing novel resinous gravure printing plates comprises coating on a printing substrate such as a cylinder a radiation-curable resin coating composition containing in a specific ratio a soluble polyamide resin and a radiation-polymerizable monomer or the like dissolved in a solvent, curing the coated film by irradiation with actinic rays, and engraving the resulting cured film. As a result, a novel resinous gravure printing plate having excellent engraving property, printing durability, and solvent resistance is produced.

Process for producing gravure printing plates

A method and an apparatus for fabricating gravure printing cylinders of synthetic resin in which a solution of a photosetting polyamide resin used as a coating resin is applied over the surface of a cylindrical base spirally as successively overlaid layers and thereafter the applied resin in subjected to drying by a heater and to photosetting by irradiation with ultraviolet rays, electron rays or the like. The resin layer surface thus obtained is mechanically engraved by an electronic engraver for forming gravure cells. The irradiation of ultraviolet ray, electron ray, or the like may be effected during or after application of the polyamide resin over the cylindrical base.

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Toda, Japan

Eiichi Tachibana