| 摘要 |
PURPOSE:To raise a buffering effect in the manufacture of polyolefinic expanded sheet or film by a method in which a composition consisting of an ethylene- propylene copolymer containing 1-10mol ethylene, ethylene-vinyl acetate copolymer, and a blowing agent is molded into a film, and the film is stretched sideways. CONSTITUTION:A composition consisting of an ethylene-propylene copolymer containing 1-10mol ethylene, an ethylene-vinyl acetate copolymer, and a blowing agent is extruded into a flat sheet form from a die under a condition that no expansion occurs in the die. On the other hand, at the same time, a thermoplastic resin compound having the same raw material composition as said expanded sheet is extruded on said expanded sheet to form a laminate layer with the thermoplastic film. The film is then stretched sideways by a tentor in such a way as to cause the expanded sheet to closely adhere to the thermoplastic film, thus permitting a polyolefinic expanded sheet or film having a very high adhesion to be obtained. |
