| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an injection molding method and an injection molding die for favorably preventing defects in appearance such as a surface sink occurring on a design face of a product. <P>SOLUTION: By setting a die cavity temperature on a design face side to be higher than a die cavity temperature on the opposite design face side, a die cavity face on the design face side is in an condition in which resin is easily adhered than a die cavity face of the opposite design face side. Then, after completion of resin injection, die fastening force is lowered, and resin pressure in the die is controlled to be 0 Pa in a short period of time. By separating the resin from the die cavity face on the opposite design face side in a short period of time, the resin on the design face side is prevented from being effected by thermal contraction to suppress the occurrence of a surface sink. In addition, when gas is injected in the die cavity face on the opposite design face side after the completion of injection, the effect is further enhanced. <P>COPYRIGHT: (C)2012,JPO&INPIT |
