Current situation and development direction of hol

The current situation and development direction of hollow plastic molding machines in China

extrusion and blowing hollow plastic molding machines are the main equipment for the formation of hollow containers. 80% to 90% of the hollow containers in the world are formed by extrusion and blowing. In the development process of hollow plastic molding machines in China, the extrusion blow molding machine is the fastest developing and most perfect hollow plastic molding machine, especially the small extrusion blow molding machine. At present, many manufacturers in China can produce extrusion blow hollow plastic molding machines for forming 1000L single-layer hollow containers

1 multilayer coextrusion hollow plastic molding machine

multilayer coextrusion hollow plastic molding machine is a promising hollow plastic molding machine. Multi layer blow molded high barrier hollow products 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 packaging plastic machinery factory can produce a six layer 500L co extrusion hollow plastic molding machine, which reaches the level of similar machines in Germany

1.1 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, head 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

1.2 the focus of developing product varieties

0.2l ~ 1L cosmetics and household hygiene detergent 2 ~ 3-layer co extrusion hollow plastic molding machine. Internationally, cosmetics and household hygiene cleaners are 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

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

2 injection blow large hollow plastic molding machine

injection blow large hollow plastic molding machine continues to apply with axial deformation. The machine is developed on the basis of extrusion blow large hollow plastic molding machine, which is suitable for molding single-layer large hollow plastic products. Injection blow large-scale hollow plastic molding machine is a comprehensive hollow plastic molding machine that combines the injection plasticizing mechanism of the injection machine with the blow molding and clamping mechanism of the extrusion blow hollow plastic molding machine. It absorbs and gives full play to the respective advantages of the two machines to achieve high parison weight repetition accuracy, high plasticizing capacity, short color and material change time, and high strength of the melt fusion seam area. Squeeze blow large-scale hollow plastic molding machine generally adopts "1"? α Fresh? Head, the internal structure is complex and there are many parts, so from? α Fresh? Due to the characteristics of the head itself, there are inevitable shortcomings, such as long time for color change and refueling, inaccurate measurement accuracy and so on. Injection blow large hollow plastic molding machine head handle squeeze blow hollow plastic molding machine? α Fresh? In the head? α Shrimp (5) will bother the bream to knock on the street δ The machine head is completed by the injection plasticizing mechanism. In this way, the machine head has the advantage of continuous machine head easy to change color and material. At the same time, the structure of the machine head is simplified, and the reasonable flow channel design fundamentally solves the problem of extrusion blow hollow plastic molding machine? α Fresh? At the same time, it does not affect the installation of the parison wall thickness control servo system

3 "one-step" injection, pull and blow hollow plastic molding machine

"one-step" injection, pull and blow hollow plastic molding machine, small and medium-sized machines mainly shape pet carbonated beverage bottles and mineral water bottles, and large machines mainly shape PC pure water bottles. The "one-step" injection, drawing and blowing hollow plastic molding machine is an efficient equipment that continuously carries out the processes of injection molding, heating molding, stretching molding, blow molding and demoulding of molded products on the same equipment. At present, the injection, drawing and blowing hollow plastic molding machines used in China are basically the equipment of Aoki and Nissei of Japan, which is worth pondering by every hollow equipment manufacturer. The injection and blowing hollow plastic molding machine has its own characteristics, which cannot be replaced by other bottle blowing machines. Foreign manufacturers are optimistic about the Chinese market. According to their estimates, the beverage packaging industry, the Chinese market also needs no less than 800 "one-step" injection, drawing and blowing hollow plastic molding machines for the production of PET bottles

3.1 analysis of problems in research and development

after nearly ten years of research and development, why can't the injection, drawing and blowing hollow plastic machines in China reach the commercialization level in addition to the above-mentioned manufacturers. The author believes that the main reasons are as follows:

3.2 misunderstanding of development ideas

only focus on host development and ignore mold development. The injection and blowing hollow plastic molding machine is a combination of the host and the mold. From the importance of the host and the mold to the whole machine, the host only accounts for 40% of the whole machine, while the mold accounts for 60% of the whole machine. The successful development of the host does not mean the successful development of the whole machine. Only the successful joint development of the host and the mold can we say that the development of the injection and blowing hollow plastic molding machine is successful. The key technology of Japanese Aoki solid "three station" and Japanese Japanese precision "four station" models is the mold, and some of our plastic machinery factories did not correctly recognize the relationship between the host and the mold under the support of the National Natural Science Foundation of China in the process of developing the injection, drawing and blowing hollow plastic molding machine, and only paid attention to the development of the host, rather than putting the development of the mold in a more important position. This is the main reason for the failure

3.3 the technical level of the mold cannot meet the requirements

the mold of the injection, drawing and blowing hollow plastic molding machine is different from the injection molding mold, and has its own characteristics. Among the molds of today's plastic molding machines, the key is the mold of injection molding blank. The material of the mold has special requirements for its performance, heat? The cold shrinkage coefficient is small, the heat transfer efficiency is high, and the heat conductivity is high. The structure of the die is in the form of hot runner. Judging from the current mold technology level in China, it is still impossible to develop and manufacture molds of injection, drawing and blowing hollow plastic molding machines that meet the quality standards. It is understood that some mold factories do not know which material is used in the mold of the injection, drawing and blowing hollow plastic molding machine. How can they develop a mold

due to the lack of investment in the mold factory, the mold technology level cannot be developed. It is understood that foreign mold factories that develop and manufacture injection, pull and blow hollow plastic molding machines have their own injection, pull and blow hollow plastic molding machines, and the developed molds are tested repeatedly on the host until they meet the requirements, while no domestic mold factory purchases injection, pull and blow hollow plastic molding machines as trial production equipment for the development of injection, pull and blow hollow plastic molding machines

3.4 there is a lack of cooperation between the main engine factory and the mold factory

the development of the "one-step" injection, drawing and blowing hollow plastic molding machine, the main engine factory and the mold factory must cooperate. Each has its own division of labor and joint development, and each bears its own risks. This is the experience of foreign countries in developing the "one-step" injection, drawing and blowing hollow plastic molding machine. For example, Aoki Gu and Nissei companies in Japan have mold factories supporting them. The main machine factory puts forward the requirements, the mold factory develops them, and then hands them over to users. However, some of our main engine manufacturers do not know the molds of the "one-step" injection, drawing and blowing hollow plastic molding machine very well. In order to save the development cost, they make their own molds. As a result, not only the formed products fail to meet the quality standards, but also the image of the main engine is adversely affected

3.5 development direction

mold is the focus of the development of "one-step" injection, drawing and blowing hollow plastic molding machine. The key point of developing the mold of the "one-step" injection, drawing and blowing hollow plastic molding machine is to develop the mold of the injection mold blank. The key point of developing the mold of the injection mold blank is the material of the mold, the design of the hot runner nozzle and hot runner, and the temperature control system. At present, when the mold of the "one-step" injection, drawing and blowing hollow plastic molding machine in China cannot reach the technical level, the main engine factory can cooperate with relevant foreign mold factories. As long as the mold reaches the due technical level, coupled with our host, it can be said that the "one-step" injection, drawing and blowing hollow plastic molding machine can go to the market

4 "one step and a half method" injection, pull and blow hollow plastic molding machine

"one step and a half method" injection, pull and blow hollow plastic molding machine is different from the "one-step" injection, pull and blow hollow plastic molding machine in that there is a long transition time between parison injection and stretching, that is, the comprehensive injection, pull and blow hollow plastic molding machine that combines the conventional injection parison equipment with the one-step Fara blow hollow molding equipment. The advantage is, Compared with "one-step" molding, it reduces the performance requirements of the mold, but due to reheating, stretching and blow molding, the mold embryo is biaxially stretched, which improves the orientation crystallinity of PET bottles, so that they can be hot filled at 87 ℃. From the current comprehensive level and national conditions of China's development, the "one-and-a-half" injection, drawing and blowing hollow plastic molding machine is suitable for national conditions and has the research and manufacturing capacity from host to mold. The focus of research and development is how to improve productivity

5 pull blow hollow plastic molding machine

Pet pull blow hollow plastic molding machine is to stretch blow molding after heating the formed parison. Pull blow hollow plastic molding machine root