Current situation and development of hollow plasti

2022-08-06
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The current situation and development of hollow plastic molding machines in China's packaging industry innovative plastic packaging has increased dramatically and poured into the market direction (II)

(3) the focus of developing product varieties

0.2l ~ 1L cosmetics and household hygiene detergent 2 ~ 3-layer co extrusion hollow plastic molding machines. Internationally, cosmetics and household sanitary cleaners are basically packaged in multi-layer hollow plastic containers, while in China, the vast majority of them are still packaged in 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 the multi-layer high-performance hollow plastic containers for cosmetics and household hygiene cleaners will have a larger market

4 ~ 6-layer coextrusion automobile fuel tank hollow plastic molding machine. Multi layer co extrusion hollow plastic molding has a broad 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, Tensile test of the catheter of the friction and wear tester: the failure of section 1 of these materials may endanger the patient's safe use of the six layer co extruded oil tank of pe/tackifier/e-val/tackifier/recycled material/pe-hd. The multi-layer co extrusion hollow forming not only improves the adaptability of the product, but also improves the rigidity of the product and reduces the weight of the product due to the reasonable combination of materials in each layer. More than 90% of the automobile fuel tanks in the United States use multi-layer co extrusion hollow plastic molded parts, which is worth learning and thinking. In China, the hollow plastic forming machine for multi-layer co extrusion automobile fuel tank is mainly imported, and the domestic equipment is still in the stage of popularization 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 forming machine, which is equipped with four extruders to produce three-layer 220l large barrels that meet the requirements of dangerous goods transportation. 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 co extrusion molding process

the research on multi-layer co extrusion 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. They pay attention to the development of equipment and ignore the research of molding process, which affects the development, popularization and application of equipment. The multi-layer coextrusion molding machine is different from the injection molding machine. The equipment development unit's mastery and familiarity with the multi-layer coextrusion molding process largely determines the development, promotion and application of the equipment. We must pay enough attention to this issue and guarantee it in terms of organization, staffing, financial resources and equipment

1.2 large extrusion blow hollow plastic molding machine

with the rapid development of the chemical industry and the continuous expansion of chemical products in international trade, the demand for large extrusion blow hollow containers is growing rapidly. In recent years, 1000L IBC barrels have grown at a faster rate, 8% in Europe and 25% in the United States, and are replacing double L ring barrels. The increasing demand for large extrusion blow hollow containers has driven the development of large extrusion blow hollow plastic molding machines. In 1998, Shanghai huawang Industry Co., Ltd. developed a 1000L large-scale hollow plastic molding machine, which filled the domestic gap, and produced 1000libc barrels and hollow pallets. Several famous 4 Working dimension: diameter 160mm × Manufacturers of 44mm extrusion blow hollow plastic molding machines have successively launched large-scale extrusion blow hollow plastic molding machines, and in recent years, the equipment has made many new developments, mainly in energy saving and high efficiency

1.2.1 research and development focus

1.2.1.1 improving production efficiency

shortening production cycle and improving production efficiency are important contents of technical progress of large extrusion blow hollow plastic molding machine. The production efficiency of China's large-scale extrusion blowing hollow plastic molding machine is much lower than that of similar large-scale hollow plastic molding machines of the same specification in the world. Therefore, we should not only be satisfied that the equipment can form products, but should make research and development on improving production efficiency. The main factors related to production efficiency are plasticizing capacity and blow molding cooling time

(1) improving plasticizing capacity (extrusion plasticizing production capacity)

improving plasticizing capacity is a prerequisite for improving production efficiency. The plasticizing capacity of the extruder prepared on the large-scale extrusion blowing hollow plastic molding machine developed in China is generally lower than that of the extruder of the same specification in the world, so the molding cycle is long and the energy consumption is high. The extruders prepared by some domestic units on large-scale extrusion blow hollow plastic molding machines generally adopt the extruders of conventional design. They have not made a profound study on the particularity of the extruders required by large-scale extrusion blow hollow plastic molding machines, and still stay on the concept of general-purpose extruders. They are only satisfied with plasticizing and extrusion, and do not pursue high plasticizing capacity

improve the plasticizing capacity, that is, improve the plasticizing performance and conveying capacity of the screw barrel. Internationally, "IKv" structure with forced feeding and forced cooling has long been adopted for extruders prepared on large-scale extrusion blowing hollow plastic molding machines. The "IKv" structure is mainly composed of deep and wide longitudinal grooves with different shapes on the bushing in the feeding area of the barrel, and a forced cooling structure is designed in the feeding area, which greatly improves the conveying efficiency 5 to 0 85. In addition to the reasonable design of barrier section and mixing section, its plasticizing capacity is more than 50% higher than that of the conventional extruder, and the extrusion capacity is stable. Domestically produced φ When processing hmwhdpe powder, the plasticizing capacity of 150/25 extruder only reaches 250kg/h, and the plasticizing capacity of "IKv" structure of German Krupp company φ The 150/25 extruder is processing hmwhdpe mixed with 70% new material and 30% crushed material. Its plasticizing capacity reaches 600kg/h, and the nominal specific power is only 0.3kw/kg h-1。 "IKv" structure has not been adopted in domestic extruders, which is worthy of our deep consideration. Of course, the "IKv" structure also has some defects, such as serious wear of the screw and barrel, high energy taken away by the cooling water, etc. Therefore, when designing the screw and barrel, we should combine the actual situation and constantly adopt new materials and new technologies, constantly study and improve on the basis of the "IKv" structure, so as to improve the plasticizing capacity and quality. Of course, some manufacturers have made achievements in improving the plasticizing capacity. Guangdong Jinming Plastic Equipment Co., Ltd. has developed a high-yield screw that can process not only 100% new materials but also 100% powder and 100% recycled materials. Its output is more than 40% higher than that of the conventional design screw. The following table is a comparison of the plasticizing capacity of some major domestic and foreign manufacturers' large-scale extrusion blow hollow plastic molding machines, from which we can see our gap

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