The Injection Molding Process of PP Injection Molding

The injection process of PP injection molding mainly includes the filling stage, densification stage, pressure holding stage, and cooling stage.

1. Mold filling stage: PP melt is pre molded and heated inside the injection molding machine barrel, and then enters the mold cavity through the push of screws. At this stage, it is necessary to ensure that the melt fills the mold cavity and avoid defects such as bubbles and material shortages.

2. Densification stage: After the filling is completed, the melt rapidly cools and solidifies in the mold cavity. At this point, it is necessary to increase the injection pressure to compact the melt and reduce the shrinkage rate.

3. Pressure holding stage: During the pressure holding stage, a certain amount of pressure and time should be maintained to ensure complete cooling and solidification of the product and reduce shrinkage rate. The selection of holding time and pressure should be adjusted according to the wall thickness and structure of the product.

4. Cooling stage: After the pressure holding is completed, it enters the cooling stage. At this time, it is necessary to control the mold temperature to accelerate the cooling and solidification process of the product. After the cooling time is over, the mold can be opened and the product can be taken out.

Qingdao Juchang Plastic Injection Co., Ltd. is a specialized plastic mold and plastic products research and development, production, sales, service in one of the injection molding manufacturing enterprises. We can accept all kinds of injection molding, mold making, product assembly and OEM. For more information about pp injection molding, please contact us.

Company: Qingdao Juchang Plastic Injection Co., Ltd

Address: Qingdao Jimo District environmental protection Industrial Park environmental protection Road No. 17

Email: sunkc@163.com

Website: www.jchplas.com