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Multi layer co extrusion hollow plastic molding machine technology development multi-layer co extrusion hollow plastic molding machine is a very promising hollow plastic molding machine. Multilayer blow molded hollow products will be in the field of hollow products accounted for the proportion of more and more large. Multi-layer blow molding products not only in the food packaging industry is developing rapidly, but also in the chemical, cosmetics, pharmaceutical and health and other industrial packaging also rapid growth. Multi layer co extrusion hollow plastic molding machine is a weak link in the field of extrusion blow molding machine in our country. The development of CO extruded hollow products to promote the development of multi-layer co extruded hollow plastic molding machine. Internationally, in recent years, the development of multi-layer co extrusion hollow plastic molding machine speed is very fast, while technological progress is also very fast. There are also some domestic varieties, for example, the development of Hengyang Huayi machinery rubber machine Co. Ltd. HYB-75D three layer co extrusion double mold labeling hollow molding machine, four die by two stations, equipped with integrated PID precise temperature control system, the real-time detection of the screw extrusion pressure, automatic flash, precise SIEMENS computer control does not affect the products in middle and inner layer thickness decreases resistance permeability under the condition of quality (0.03-0.05mm), to fill the domestic blank. Hollow plastic co extrusion molding machine Shaanxi Qinchuan plastic machinery factory can produce six 500L, reached the German machines of the same kind. The research focus of research and development of multi-layer co extruded hollow plastic molding machine mainly has the following three points: (1) a total of a range of extrusion die (die), to meet the needs of different materials, different layers, head diameter and other requirements; (2) research on combination packaging system, it can according to different raw materials made out of head combination number possible; {TodayHot} (3) on the basis of mechanical process, it can be a different number of molding station and production speed and product design of the size of the platform include. (1) multilayer co extrusion die head is multilayer co extrusion hollow plastic molding machine of the heart and brain, its performance should be able to: control to achieve the circumferential and lateral distribution of materials and perfect the best state of every layer is not affected by the material distribution and processing a wide variation of plastic materials and different extrusion amount. Spiral mandrel combination system with high adaptability, multi segment structure up to seven layers, to meet the needs of special products, the optimal processing conditions, the system is the preferred multilayer co extrusion die. Rheological design of multilayer coextrusion die design is the key, to be able to achieve the head doesn't depend on the productivity and material distribution of the viscosity of the raw material, has the function of automatic cleaning and high minimum amount of Cucheri good at low extrusion amount, good circle distribution in each layer, layer distribution of raw materials can, plastic raw materials, processing a wide range of different extrusion amount and different extrusion ratio. Large multi-layer co extruded hollow plastic molding machine adopts accumulator head, the structure is the host head in each layer of the nose, with a concentric annular piston, the head and the storage cavity are made into a whole, which can realize the high speed extrusion type embryo under low pressure. (2) the adaptability and adaptability and combined extruding combined machine extruder is premise of guaranteeing quality of multi-layer co extruded hollow plastic products.