The fully automatic water tank blow molding machine can produce water tanks ranging from 100 liters to 500 liters and 1 to 10 layers. With the development of multi-layer blow molding machine technology and the increase in the number of blow molding machine head parisons, the difficulty of design, production and process adjustment will also increase. In recent years, some high-speed multi-layer blow molding equipment has adopted a multi-die and multi-station design to improve the production efficiency and production capacity of the hollow molding machine. In order to meet the design needs of multi-layer blow molding machines, there are various forms of multi-layer heads in use. Compared with single-layer heads, multi-layer heads are more difficult to design, produce and adjust the process. At the same time, multi-layer heads also have single-die heads, double-die heads and multi-die heads. The plastic head is an important component to ensure the molding of the pariso…