LAMINATED FILM FOR HEAT-SENSITIVE STENCIL PRINTING ORIGINAL PAPER AND HEAT-SENSITIVE STENCIL PRINTING ORIGINAL PAPER

摘要

PROBLEM TO BE SOLVED: To make perforation properties good with low energy and to obtain a diameter of perforation in accordance with change in energy level by bonding a porous substrate on a laminated film for a heat-sensitive stencil printing original paper constituted of films of at least two layers. SOLUTION: A laminated film for a heat-sensitive stencil printing original paper is prepd. by a method wherein polyesters with different m.p. of at least 5 deg.C each other wherein an arom. dicarboxylic acid or an aliph. dicarboxylic acid and a diol are main constitutional ingredients are melt-extruded by using separate extruders and they are laminated in a nozzle manifold part or a polymer pipe entering to a nozzle and the polymers are extruded on a cast drum and the undrawn laminated film is drawn by means of a biaxial stretching method. A porous substrate is bonded on the laminated film for the heat- sensitive stencil printing original paper. It is possible to obtain good perforation properties by low energy and in accordance with change in energy level.