| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve a problem that cost is substantially increased since a T die is expensive in a sheet blow molding method in which a conventional cylinder parison forming die mounted on an extrusion head of a blow molding machine is exchanged with two T dies for extruding two resin sheets, and the two resin sheets are simultaneously extruded from the two T dies. <P>SOLUTION: A blow molding parison extrusion die includes a cone trapezoidal cylinder shape clearance between a nozzle and mandrel mounted on an extrusion head of a blow molding machine, wherein the clearance at 180 degree opposite position is partially blocked with two blocking pieces to thereby solve the problem. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
