PLATE-MAKING METHOD AND PLATE-MAKING APPARATUS FOR STENCIL PRINTING AND STENCIL PRINTING MACHINE

摘要

The present invention is a plate-making method for stencil printing in which heat-sensitive stencil plate material for stencil printing consisting of a thermoplastic resin film is melted by heating of a thermal head to perforate an ink permeable openings. Many minute recesses (14) are formed on one side of the film (12). The thermal head (10) is constituted so that the heater size thereof satisfies HM0.6 PM and HS0.7 PS when the arranging pitch of heaters on a main scanning side is set to PM, the length of the heaters on the main scanning side is set to HM, a feed pitch on a sub-scanning side is set to PS and the length of the heaters on the sub- scanning side is set to HS. An opposite side to the minute recess side of the film is heated by heating of the thermal head with an energy output of 35 mili-joule/mm2, so that the heated portion is melted for communication with the recesses to form ink permeable openings. It make it possible to thermally perforating individual ink permeable openings in the film independently without increasing an output of a thermal head, and it realizes stencil printing by using a stencil plate material consisting only of a thermoplastic resin film.