| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for injection molding which produces no resin flash, facililates the release of a fine needle, and enables the reproduction of its complicated outer shape in fidelity. <P>SOLUTION: The method for injection molding a fine needle having at least one protrusion comprises steps of: keeping a resin material by which the fine needle is constituted at a temperature equal to or higher than its glass transition temperature and equal to or lower than its melting point; and injecting the resin material into an air-tightly shielded molding die with an injection pressure of equal to or greater than 100 MPa. <P>COPYRIGHT: (C)2007,JPO&INPIT |
