| 摘要 |
PURPOSE:To provide the titled film ensuring clear printing of characters, clear solid printing, uniform line width of printed images and uniform printed density and having excellent durability and sensitivity, by specifying the energy of fusion and the difference between the melting ending temperature and the melting starting temperature of a biaxially stretched film of a thermoplastic resin. CONSTITUTION:The titled film is a biaxially stretched film of a thermoplastic resin which film has an energy of fusion (DELTAHu) of 3-11cal/g and the difference (DELTATm) between the melting ending temperature and the melting starting temperature of 50-100 deg.C. The degree of the biaxial stretching in terms of plane orientation coefficient is preferably 0.90-0.98. If DELTAHu is less than 3cal/g, the film will sticks to the stencil paper (manuscript), making it impossible to clearly print characters. If DELTAHu exceeds 11cal/g, voids are generated in printed images, and sensitivity is poor. If DELTATm is less than 50 deg.C, clear solid printing can not be performed, and printed density will be nonuniform. If DELTATm exceeds 100 deg.C, the line width of printed characters will be nonuniform, and the film can not be used. |
