| 摘要 |
PURPOSE:To uniformize a heating temperature at each part and contrive enhancement of image quality, by a construction wherein a thin layer provided on one side of a biaxially stretched film is made to have a uniform thickness, and substantially the same sized openings are provided in a substantially uniform density. CONSTITUTION:A regular grating form pattern of a resin liquid is provided by screen printing on the surface of a polyester film 1 biaxially stretched to a draw ratio of about 1.5 and having a thickness of about 4mum, followed by drying for 10-15min in a chamber at 60 deg.C and leaving to stand for about 1 week, whereby a printing plate material with a pattern line width of about 30mum, a length of one side of the opening part of about 100mum, and a line thickness of about 50mum. In the thin layer having the regular grating form pattern, the opening part 4 is surrounded by the line parts 3 forming the grating form pattern. When perforation test was conducted by bringing a thermal head into contact with the plate material under the condition of 20V.1msec per dot of heating element, an opening ratio per 1mm<2> of about 40% was obtained. |
