| 摘要 |
PROBLEM TO BE SOLVED: To provide a finished product which has a gate formed inside so that its deformation is limited to the minimum possible extent, in order to solve issues such as the reduction of a molding cycle, the cutting of steps, the elimination of rejects to the maximum possible extent, cost curtailment, the saving of material resources and the contamination of environments due to waste materials, when injection-molding a thermosetting resin, for example, silicone rubber. SOLUTION: In the injection molding of a thermosetting resin, time to be spent until a specified reaction stage is reached is set as the upper limit of the time for respective resins to fill a mold considering the setting characteristics of the resins and their setting reaction rate to be decided depending upon molding temperatures. Further, the injection molding process is so controlled that the filling of the mold with the resin can be completed to the upper limit, preferably to the time within which 10% of the setting reaction is in progress. Thus the deformation of a molding is minimized. |
