1. The product should not have sharp corners or sudden changes, and the thickness should not change much to prevent the deterioration of PVC.
2. The mold temperature should have a cooling water control device, so that the mold temperature can be controlled between 30 ℃ and 60 ℃.
3. It is necessary to avoid the deterioration of PVC raw materials caused by other plastic PVC raw materials. Especially when other raw materials have been injected, the plastic in the barrel and screw must be cleaned before injection of PVC products.