... injection system, still in a plasticized state, tubular or sheet blank material trend is fixed in the mold, and immediately pass ... hollow products as a processing method. Suitable for blow molding plastic, low pressure polyethylene, hard PVC, soft PVC, polystyrene, polypropylene.2 ... to cause the unevenness of the wall thickness of the plastic products. 4.The right is a schematic diagram of the ...