PURPOSE: To provide a depictive protection film capable of writing and drawing characters or designs on the surface by a pencil of the order of HB, and having a transparency of degree capable of examining faults and, besides, having a small change of separative forces even in the case of effecting a heat treatment.
CONSTITUTION: A complex-coextruding unoriented film is of the type that has an A layer in one surface and B layer in the other surface, and also has a whole light permeability of 70% or more, wherein the A layer is featured such that it consists of olefin resin and 15-50wt.% inorganic particle having a specific refractive index, aspect ratio, and average particle diameter, and the Vickers hardness is 1.4-5.5 and the superficial roughness is 0.4μ--1.5μ, and the B layer is also featured such that it consists of straight chain low density polyethylene and a tackifier, and the superficial roughness is 0.03μ-0.18μ.
TAKEUCHI MASANORI
MATSUURA YOICHI
TORAY GOSEI FILM KK