Technical development of the hottest multi-layer c

2022-10-21
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Multi layer co extrusion hollow plastic molding machine technology development details

multi layer co extrusion hollow plastic molding machine is a promising hollow plastic molding machine. Multilayer blow molded high barrier hollow products will account for an increasing proportion in the field of hollow products. Multi layer blow molded products have developed rapidly not only in the food packaging industry, but also in chemicals, cosmetics, medicine and health and other industrial packaging

multilayer coextrusion hollow plastic molding machine is a weak link in the field of extrusion blow hollow plastic molding machine in China. The development of multi-layer co extrusion hollow products promotes the development of multi-layer co extrusion hollow plastic molding machine. Internationally, in recent years, the multi-layer co extrusion hollow plastic molding machine has developed rapidly, and the technology has also made rapid progress. There are also some varieties launched in China. For example, hyb-75d three-layer co extrusion double station in mold labeling hollow forming machine developed by Hengyang Huayi machinery rubber and plastic machine Co., Ltd. adopts four die heads and two stations, and is equipped with an accurate integrated PID temperature control system. The extrusion pressure of each screw is detected in real time, and the flash is removed automatically. The precise Siemens full computer control reduces the thickness of the middle and inner layers (0..05mm) without affecting the product's barrier quality, It fills the domestic gap. Shaanxi Qinchuan plastic machinery factory can produce a six layer 500L co extrusion hollow plastic molding machine, which reaches the level of similar machines in Germany

research and development focus

the research on multi-layer coextrusion hollow plastic molding machine mainly includes the following three points: (1) study a certain range of coextrusion heads (die heads) to meet the requirements of different materials, different layers, die diameters, etc; (2) Study the combined packaging system, which can tailor the machine head with the allowable number of combinations according to different raw materials; (3) Study the basic mechanical program, which can use different number of molding stations and platform sizes including production speed and product design

(1) multi layer coextrusion head

the head is the heart and brain of the multi-layer coextrusion hollow plastic molding machine. Its performance should be able to: control each layer to achieve the best state and complete circumferential and lateral material distribution, and can process widely changing plastic raw materials and different extrusion quantities without the influence of material distribution. The spiral mandrel combination system, with high adaptability, multi-stage structure up to seven layers, meets the needs of special products, and the processing conditions are optimal. It is the preferred system for multi-layer coextrusion heads. The rheological design of the multi-layer coextrusion head is the key in the design. The head should not be lazy about the viscosity of raw materials related to productivity and raw material distribution, have good self-cleaning function under low extrusion volume and the minimum shear heat under high extrusion volume, have good circumferential distribution in each layer, have uniform distribution of layer combination raw materials, and can process a wide range of plastic raw materials, different extrusion volumes and different extrusion ratio. The large multi-layer co extrusion hollow plastic molding machine adopts a storage head. This structure is that the main head is above the head of each layer, and concentric annular pistons are prepared to integrate the head and the storage cavity, so that the high-speed extrusion of the embryo can be realized under low pressure

(2) adaptability and combination of extruder

adaptability and combination of extruder is the premise to ensure the quality of multi-layer co extruded hollow plastic products. The developer must first thoroughly understand the objects processed by the developed multi-layer coextrusion hollow plastic molding machine (including the scraped products, the characteristics of the materials in each layer of the product, the bonding performance between the materials in each layer, and the characteristics of the tackifier), and then design the extruder suitable for the desired plasticized material objects, and determine the number and type of extruders required. The extruder should be able to adapt to the plasticization of different flows and materials, and the productivity should be higher than that of the standard extruder. The structure of screw and barrel varies with the properties of processing materials. Each extrusion device shall be equipped with automatic quantitative feeding hopper to accurately control the feeding amount. When extruding soft and hard PVC and ABS materials, the six layer co extrusion hollow plastic molding machine of Fischer company in Germany adopts planetary gear extrusion screws, and is also equipped with a sealed cooling area, so that the materials can be plasticized evenly at low temperature and have high conveying capacity

(3) focus on developing product varieties

0.2l ~ 1L cosmetics and household hygiene detergent 2 ~ 3-layer co extrusion hollow plastic molding machine. Internationally, dbj/t01 (2) 7 (2) 003, the code for quality acceptance of cosmetics and household hygiene and cleaning advanced building decoration projects, is basically packaged in multi-layer hollow plastic containers, while the vast majority of China still uses single-layer hollow plastic containers. With the improvement of people's quality of life, the requirements for chemical resistance and impermeability of hollow plastic containers for cosmetics and household hygiene cleaners will be higher and higher, and there will be a larger market for multi-layer high-performance hollow plastic containers for cosmetics and household hygiene cleaners

However, there is still a big gap in equipment manufacturing and engineering capacity

4 ~ 6-layer coextrusion automobile fuel tank hollow plastic molding machine. Multi layer coextrusion hollow plastic molding has a wide development prospect in automotive fuel tanks. With the improvement of environmental protection requirements, single-layer fuel tanks can no longer meet the requirements of environmental protection, and the use of high barrier multi-layer fuel tanks has become a development trend. For example, the use of PE/tackifier/e-val/tackifier/recycled material/pe-hd six layer coextrusion fuel tanks. In multi-layer co extrusion, hollow forming not only improves the adaptability of products, but also improves the rigidity of products and reduces the weight of products due to the reasonable combination of materials in each layer. More than 90% of automotive fuel tanks in the United States use multi-layer co extruded hollow plastic molded parts, which is worthy of our study and thinking. The hollow plastic molding machines that produce multi-layer coextrusion automobile fuel tanks in China are mainly imported, and the domestic equipment is still in the stage of promotion and application

large multi-layer co extrusion hollow plastic molding machine. This kind of large multi-layer co extrusion hollow plastic molding machine mainly produces containers that meet the transportation of chemicals and dangerous goods. Mauser company has launched a double station three-layer co extrusion hollow plastic molding machine, which is equipped with four extruders to produce three-layer 220l large barrels that meet the transportation requirements of dangerous goods. The inner layer is tear resistant HDPE, the outer layer is UV resistant layer, and the middle layer is high relative molecular weight HDPE. It can produce 80 to 100 barrels per hour, and each barrel weighs 8.5Kg

(4) research on multi-layer coextrusion molding process

the research on multi-layer coextrusion molding process by equipment development units in China is the weakest link. This has affected the development, popularization and application of the equipment. Domestic equipment development units basically do not have a special molding process research machine, pay attention to the development of equipment and ignore the research of molding process, which affects the development, promotion and application of no oil flow from the oil return pipe of the equipment. Multi layer coextrusion to ensure their survival and health. Molding machines are different from injection molding machines. The degree of mastery and familiarity of equipment development units with multi-layer coextrusion molding process largely determines the development, promotion and application of equipment. We must pay enough attention to this and guarantee it in terms of institutions, staffing, financial resources, equipment, etc. (end)

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