| 摘要 |
PROBLEM TO BE SOLVED: To achieve the weight reduction of a foamed resin molded product or the enhancement of dimensional precision and to prevent the occurrence of a defect in appearance or burr. SOLUTION: Non-foam molding is performed as preparatory work. A resin not mixed with a foaming agent is injected in a cavity 3 while heating a mold and the pressure of the resin at this time is measured. After the cavity 3 is filled with the resin, the mold is quenched and both molds 1 and 2 are opened to take out the molded product. If the appearance of the non-foamed molded product is good, the pressure of the resin in the process is set to the standard pressure of the resin. The mold clamping force of the mold is set to 0.5-1.0 times (the standard pressure of the resin)×(the projection area of the cavity 3) to perform a foam molding process. That is, the mold is closed by the mold clamping force thus set and the resin mixed with the foaming agent is injected in the cavity 3 while heating the mold. After the cavity 3 is filled with the resin, the mold is quenched and both molds 1 and 2 are opened to take out the molded product. COPYRIGHT: (C)2006,JPO&NCIPI |
