| 摘要 |
PROBLEM TO BE SOLVED: To perform injection filling so that a filler having a tendency to orient is not oriented in a specific direction. SOLUTION: A molten resin is injected while the cross-sectional area of a gate 14 is reduced by advancing a needle 20 at an initial stage of injection to generate jetting and, thereafter, the needle 20 is allowed to retreat to increase the cross-sectional area of the gate to perform injection under a condition generating no jetting. When jetting is generated, the flow direction of the molten resin becomes random as a whole and, therefore, the orientation direction of a filler having a tendency to orient becomes random as a whole. |
