| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for injection molding suitable for preventing poor appearance such as a sink mark generated on a design face of a product. <P>SOLUTION: The temperature of a mold cavity on the design face side is set higher than the temperature of the mold cavity on the opposite design face side, and a material C to be gasified by the heat quantity of a resin injected and filled into the mold cavity 15 on the opposite design face side is applied. After injection of the resin is completed, by decreasing a mold clamping force and controlling so that a resin pressure in the mold 10 becomes 0 Pa in a short time, to generate a gas between the mold cavity face on the opposite design face side and the resin, and to separate the resin on the opposite design face side from the mold cavity 15 in a short time, and the influence caused by heat shrinkage of the resin is not affected on the resin of the design face side, to suppress generation of the sink mark. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
