Film for thermal stencil sheets.

摘要

A novel film matrial for thermal stencil sheets is disclosed. The film comprises a biaxially stretched polyester film which contains 0.1-5.0 wt% of fine particles having an average diameter of 0.05-2.0 mu m and has a melting point of 170-230 C and a thickness of 0.5-2.5 mu m and the maximum value of an average longitudinal and transversal thermal constriction stress of the film at a temperature of 100-160 C is 500-1500 g/mm<2>. The film for heat-sensitive mimeographic printing stencil sheets of the present invention is excellent in handling property, sensitivity to thermal perforation, resolution in printing, tone property and curling resistance and thus the invention is industrially very significant.