Why does metal encapsulation appear swelling and blistering?

Precision, dedicated to precision metal insert injection molding for decades, and can customize various metal encapsulations and motor housings. In the actual manufacturing process, you will find that swelling or bubbling sometimes occurs after molding and demolding. Why does this happen to metal encapsulation? Let's find out. Swelling or bubbling occurs on the back of the metal encapsulated product or in a particularly thick part, which is caused by the expansion of gas released by the plastic that has not completely cooled and hardened under the action of the internal pressure. Solution: 1. Effective cooling. Reduce the mold temperature, extend the mold opening time, and reduce the drying and processing temperature of the material. 2. Reduce the filling speed, reduce the forming cycle, and reduce the flow resistance. 3. Increase the holding pressure and time. 4. Improve the situation that the wall surface of the part is too thick or the thickness changes greatly. [Related recommendation] Learn more: 精の corporate culture Learn more: Continuous improvement and innovation are the key factors for the survival of stamping companies Learn more: Why most stamping factories are unwilling to quote foreign trade companies