Common Defects and Solutions in PP Injection Molding

PP injection molding is a processing method that involves melting polypropylene plastic raw material at high temperature and injecting it into a mold cavity under high pressure, followed by cooling and solidification to obtain a plastic product of a specific shape. The following are common defects in PP injection molding and their solutions:

1. Air bubbles: These may be caused by excessive moisture and volatile content in the raw material, improper gate placement, or poor mold venting. Solutions include increasing the barrel and mold temperature, changing the gate location, removing volatile substances from the raw material, and improving the mold's venting system.

2. Warpage: This may be caused by uneven shrinkage or uneven cooling of the plastic. Solutions include optimizing mold design, controlling the cooling rate, and adjusting injection pressure and holding time.

3. Shrinkage depressions: These may be caused by excessive shrinkage during the cooling process. Solutions include increasing the mold temperature, extending the holding time, and optimizing the mold runner and gate structure.

Qingdao Xueyu Molding Products Co., Ltd. is mainly engaged in the design and manufacturing of injection molds, injection molding and secondary processing (spraying, pad printing, ultrasonic welding, stamping), etc. For more information about pp injection molding, please contact us.

Website: www.xyzmould.com

Address: No.18 Henan Head Road, Henan Head Community, Jihongtan Street, Qingdao Industrial Park, Shandong Province, China

Email: wangmiaotian8@163.com