| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems that in a screw type extrusion molding machine for obtaining a cylindrical member, as it is conventionally necessary to make a structure with a core in a mold, the manufacturing cost for the mold capable of obtaining the cylindrical member with a narrow diameter is high, and as the core is sometimes broken during molding, it is necessary to have maintenance and the production efficiency is deteriorated. SOLUTION: In the screw type extrusion molding machine 1 having the mold 8 for molding a molded body in the extruding direction of a molding raw material 12, when the dimension of the inner diameter of an outlet part 8a of the mold is represented by (A), the diameter of a screw is represented by B, and a distance from the tip part 7a of the screw to the outlet part 8a of the mold is represented by C, the value of (A) is 1.0-2.5 mm, the value of B/(A) is 20-30, and the value of C/B is 0.5-2.0. It becomes possible to obtain the cylindrical member without using the core, and it becomes possible to decrease the manufacturing cost of the mold 8 and to improve the production efficiency of the cylindrical member. COPYRIGHT: (C)2008,JPO&INPIT
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