| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a foamed sheet made of a propylene resin having a smooth surface. <P>SOLUTION: A molten foamed sheet made of the propylene resin, which is obtained by melting and kneading the propylene resin and a foaming agent in an extruder and extruding the molten kneaded mixture into the atmosphere from a circular die, is passed through an inner cylindrical part and an outer cylindrical part to be brought into contact with the outer wall surface of the inner cylindrical part and the inner wall surface of the outer cylindrical part to manufacture the foamed sheet made of the propylene resin. A plurality of holes are provided to the inner wall surface of the outer cylindrical part and the space between the molten foamed sheet made of the propylene resin and the outer cylindrical part is depressurized through the holes to bring the molten foamed sheet made of the propylene resin into contact with the inner wall surface of the outer cylindrical part. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
