Analysis of Development Status of Plastic Molding Machine in China

In the course of development of hollow plastic molding machines in China, extrusion blow hollow plastic molding machines are the fastest growing and most complete hollow plastic molding machines, especially the development speed of small extrusion blow hollow plastic molding machines. At present, many manufacturers in China have been able to produce extruded blow-molded hollow plastic molding machines that form 1000L single-layer hollow containers.

1 Multi-layer co-extruded hollow plastic molding machine Multi-layer co-extrusion hollow plastic molding machine is a very promising hollow plastic molding machine. Multilayer blow molding high barrier hollow products occupy a larger proportion in the field of hollow products. Multi-layer blow molding products not only develop rapidly in the food packaging industry, but also rapidly increase in chemicals, cosmetics, medical hygiene and other industrial packaging.

The multi-layer co-extruded hollow plastic molding machine is a weak link in the field of extrusion blown hollow plastic molding machines in China. The development of multi-layer co-extruded hollow products has promoted the development of multilayer co-extruded hollow plastic molding machines. Internationally, in recent years, multi-layer co-extrusion hollow plastic molding machines have developed rapidly and technological progress has also been rapid. There are also some domestic varieties introduced. For example, the HYB-75D three-layer co-extrusion double-position in-mold labeling blow molding machine developed by Hengyang Huayi Machinery & Rubber Machinery Co., Ltd. adopts a four-die duplex station and is equipped with precise Integrated PID temperature control system, real-time detection of each screw extrusion pressure, automatic deflashing, accurate Siemens full computer control to reduce the thickness of the middle and inner layers (0.03-0.05mm) without affecting the product barrier quality, fill Domestic blank. Shaanxi Packaging Plastic Machinery Factory can produce six 500L co-extruded hollow plastic molding machines to reach the level of similar German machines.

1.1 R&D Focus The research of multi-layer co-extruded hollow plastic molding machines mainly includes the following three points: (1) Studying a range of co-extrusion heads (dies) to meet different materials, different layers, head diameters, etc. Requirements; (2) Research on composite packaging systems that can tailor the heads of possible combinations based on different materials; (3) Research on basic mechanical procedures that can use different numbers of molding stations and include production speeds and products The platform size of the design.

1.2 Development of Product Variety Focus 0.2L~1L Cosmetics and Household Hygiene Cleaners 2~3 layers co-extruded hollow plastic molding machine. Internationally, cosmetics and household sanitary cleaners are basically packaged in multi-layer hollow plastic containers, while the vast majority of our country still uses single-layer hollow plastic containers. With the improvement of the quality of life of the people, the requirements for the chemical resistance and the resistance to permeation of hollow plastic containers for cosmetics and household sanitary detergents will become higher and higher, and multilayer high-performance cosmetics and household sanitary cleaners will hold hollow plastic containers. There is a bigger market.

4-6 layers of co-extruded automotive fuel tank hollow plastic molding machine. The development of multi-layer co-extrusion hollow plastic molding on automotive fuel tanks is widely expected. With the increase in environmental protection requirements, single-layer fuel tanks are no longer able to meet the requirements of environmental protection, and the use of high-barrier multi-layer fuel tanks has become a trend, for example, A six-layer co-extrusion fuel tank with PE/Tackifier/E-VAL/Tackifier/Regrind/PE-HD was used. In the multi-layer co-extrusion, hollow molding not only improves the product's adaptability, 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 automobile fuel tanks in the United States use multilayer co-extruded hollow plastic molded parts, which is worth learning and thinking. China's production of multi-layer co-extruded automotive fuel tank hollow plastic molding machine is mainly imported, domestic production equipment is still in the promotion stage.

Large multi-layer co-extruded hollow plastic molding machine. This type of large-scale multi-layer co-extruded hollow plastic molding machine mainly produces containers that satisfy the transportation of chemicals and dangerous goods. Mauser has introduced a three-stage co-extruded hollow plastic molding machine with two stations. The machine is equipped with four extruders for the production of three-story 220L large barrels that meet the requirements for the transportation of dangerous goods. The inner layer is tear-resistant. HDPE, the outer layer of anti-UV layer, the middle layer of high-molecular-weight HDPE, can produce 80 to 100 barrels per hour, each barrel weighs 8.5kg.

2 Injection Blowing Large hollow plastic molding machine Injection blow large hollow plastic molding machine is developed on the basis of extrusion blowing large hollow plastic molding machine, suitable for forming single-layer large hollow plastic products. Injection large-scale hollow plastic molding machine is a comprehensive hollow plastic molding machine that combines the injection plasticizing mechanism of the injection molding machine and the blow molding clamping mechanism of the extrusion blown hollow plastic molding machine to absorb and exert the respective characteristics of the two types of machinery. It achieves high parison weight repetition accuracy, high plasticizing ability, short time for color changing and refilling, and high melt fusion zone area strength. Extrusion blowing large hollow plastic molding machine generally uses ? ? fresh cross head, the internal structure is complex, parts and more, so from the characteristics of ?? fresh cross head itself, there is inevitably there is a long time for color refill, measurement accuracy is not allowed, etc. Disadvantages. Note: Blowing the head of a large-sized hollow plastic molding machine to squeeze and blow a hollow plastic molding machine? ? ? Shrimp paste in the head of the fresh feed (5) 浼 鲂 鲂 鲂 叩 叩 叩 芊 roll In this way, the head has the advantages of a continuous head changeable color refueling, and at the same time, the structure of the head is simplified, coupled with a reasonable flow channel design, to fundamentally solve the extrusion blowing hollow plastic molding machine? The defect of long time of color change and reloading is not affected by the installation of the parison wall thickness control servo system.

3 "One-step method" injection of blow molding hollow plastic molding machine "one-step method" injection blow hollow plastic molding machine, medium and small machine main molding PET carbonated beverage bottles, mineral water bottles, mainframe main molding PC water bottles. “One-step method” injection blow molding hollow plastic molding machine is a high-efficiency equipment that continuously performs the processes of injecting parisons, heating parisons, stretching parisons, and blow molding and demoulding products on the same equipment. At present, the injection-blow hollow plastic molding machines used in our country are basically the equipment of Japan's Aokimu and Nissei, which is worthy of consideration by each manufacturer of hollow equipment. Injection blow molding hollow plastic molding machine has its own characteristics, other blowing machine can not be replaced. Foreign manufacturers are optimistic about the Chinese market, according to their estimates, the beverage packaging industry, the Chinese market also needs not less than 800 sets of PET bottles "one-step method" injection blow hollow plastic molding machine.

3.1 Problems in the development of the analysis After nearly a decade of research and development, why China's injection blow hollow plastic molding machine can not reach the level of commercialization. The reason for this, the author believes the following main reasons:

3.2 Development Ideas Misunderstanding only re-host development, ignoring mold development. The injection blow hollow plastic molding machine is a combination of the host and the mold. From the importance of the host and the mold to the complete machine, the host only accounts for 40% of the whole machine, and the mold takes up 60% of the whole machine. The successful development of the host computer does not mean that the development of the complete machine was successful. Only the successful development of both the host machine and the mold can successfully develop the hollow plastic molding machine. The technical key of Japan's Aoki's solid "three-station" and Japan's Nippon Seishi "four-station" models is mold, and some of our plastic machinery plants did not correctly recognize the host during the development of injection blown hollow plastic molding machines. The relationship between the mold and the mold only focuses on the development of the host. It does not place the development mold on a more important position. The main reason for the failure lies in this.

3.3 The level of mold technology can not meet the requirements Note Blowing blow hollow plastic molding machine mold is different from injection molding mold, has its own characteristics. Note: The key to pull-blow hollow plastic molding machine is to inject the mold of the parison. The material of the mold has special requirements on its performance, small thermal shrinkage coefficient, high heat transfer efficiency, high thermal conductivity, and heat flow of the mold. Road form. Judging from the current level of mold technology in China, it is still not possible to develop and manufacture molds for injection-blow hollow plastic molding machines that meet the quality standards. It is understood that some mold factories do not understand which type of material is used for injection molding of hollow plastic molding machines. How can we develop molds?

The lack of investment in the mold factory has prevented the development of mold technology. It is understood that the overseas development and manufacture of injection mold blow molding hollow plastic molding machine mold factory, have their own injection blow hollow plastic molding machine, the development of the mold repeatedly tested on the host until it meets the requirements, and no domestic mold factory for the development of injection Pulling the mold of a hollow plastic molding machine and buying and pulling a hollow plastic molding machine as a trial equipment for the mold.

3.4 The lack of cooperation between the OEM and Mould Factory “One-step method” injection of blow-molded hollow plastic molding machine, the main engine factory and the mold factory must cooperate, both have their own division of labor and joint development, each bears risks. This is a one-step method for foreign development. "Notes have blown into the experience of forming hollow plastic molding machines. For example, Japan's Aokimu and Japan's Nippon Seiki Co., Ltd. have a mold factory for them, which is requested by the main engine plant, which is then developed by the mold factory and then used by the user. While some of our OEMs are still very unaware of the "one-step method" injection of molds for hollow plastic molding machines, in order to save development costs and create their own molds, the resulting products not only fail to meet quality standards. It also has a bad influence on the image of the host.

3.5 The development direction of the mold is the "one-step method" injection stretch blowing hollow plastic molding machine development focus. The focus of developing "one-step method" injection molding on the hollow plastic molding machine mold is to develop a mold for injecting the parison. The focus of mold development on injection molding is mold material, hot runner nozzle and hot runner design, and temperature control system. At present, under the condition that China's “one-step method” injection molding of hollow plastic molding machines fails to reach the technical level, the OEM can cooperate with foreign mold factories. As long as the mold reaches its proper level of technology, coupled with our mainframe, it can be said that "one-step" injection molding can be used to move the hollow plastic molding machine into the market.

4 "One-step, half-process" injection of hollow plastic molding machines with one-step and half-step injection The main difference between the "one-step and one-half" injection molding and the "one-step injection" blow-blown hollow plastic molding machine is that the preform is injected and stretched. There is a longer transition period between the conventional injection blow molding machine and the conventional injection blow molding machine. The advantage is that compared to the “one-step” molding, the mold is reduced. The performance requirements, but due to the reheat stretch blow molding biaxial stretching of the embryo, to increase the PET crystal orientation, so that it can be hot filling at 87 °C. Judging from the current comprehensive level and national conditions developed by China, the “one-step-and-a-half” method is used to pull hollow plastic molding machines, which is suitable for the national conditions and has the ability to research and manufacture from the host to the mold. The focus of development is on how to increase productivity.

5 Stretch Blowing Hollow Plastic Molding Machine PET Stretch Blow Hollow Plastic Molding Machine stretches and blows molded parisons after they are heated. Pull-blow hollow plastic molding machine can be divided into two steps according to the molding process: heating parison and stretch blow-molding on two devices, and heating parison and stretch blow molding A "one-step method" on one device. The “two-step” pull-push hollow plastic molding machine is very mature in China and is the main equipment for many small-scale enterprises to produce carbonated beverage bottles. The investment cost is low, and the main drawback is the low production efficiency. "One-step method" pull blow hollow plastic molding machine has been successfully developed in China, in the future, "one-step" pull hollow plastic molding machine will replace the "two-step" pull blow hollow plastic molding machine. Blown hollow plastic molding more suitable for the formation of 0.2 ~ 20L hollow containers.

BOPP pull blow hollow plastic molding machine, BOPP bottle production is also the first injection of parison, in the heated parison, pull blown into a bottle. The molded bottle is as transparent as a PET bottle, capable of hot-filling, resistant to high temperatures of 95°C, excellent barrier properties, good chemical stability, and a production cost that is 20% lower than PET bottles. Dongguan Jiahong Machinery Manufacturing Co. has produced a hollow plastic molding machine for BOPP infusion bottles. It adopts a double-closed-loop control system to deliver more than 40 sets of equipment, filling the domestic gap.

5.1 "One-step method" pull blow hollow plastic molding machine development direction 5.1.1 increase the molding speed "One-step method" blow blow hollow plastic molding machine is the main advantage of molding speed, so to improve the forming speed is the main goal of its efforts. Side Company of France, its model is SBO-24DC, the number of the cavity of the stretch blow mold is 48, and the output of the molding 0.5L PET bottle reaches 60,000/h. The key to improving the forming speed is to optimize the heating system to reduce the heating time, improve the running transmission speed of preforms, improve the performance of preforms' rapid and stable positioning, shorten the opening and closing times of the molds, and shorten the lifting time of the blow-molded heads, and increase the number of molding cavities. .

5.1.2 Preform Quality Inspection Device The preform quality inspection device is still blank in China. The "one-step method" for blowing the preforms used in hollow plastic molding machines is mostly purchased from outside, so the quality of the preforms determines the molding rate of the finished products. To improve the molding rate, the quality of the preform must be checked. Germany Krones has developed a preform quality inspection device that detects the concentricity and internal diameter of the preforms. It can detect 72,000 preforms per hour. The device can be installed after the automatic palletizing table and can also be installed in Contiform. Hollow plastic molding machine on the horizontal feeding wheel.

6 Injection Blown Hollow Plastic Molding Machine Injection Blown Hollow Plastic Molding Machine does not stretch the injection parison. Only the parison is blow-molded. The “one-step method” on the same equipment completes the production from raw material to the formed plastic bottle. Automation High degree, especially suitable for molding small hollow containers with a large number of complicated screw caps. Injection blow molding machine has a wide range of injection blow molding materials, high accuracy of forming the bottle thread, good sealability, high strength of the products without seams, and no edge material cost saving, especially in the medicine and medicine packaging bottle industry. Injection blown hollow plastic molding is generally used for the production of bottles below 0.5L. The maximum volume of the container is below 4L. Internationally, the leading manufacturers of technology include: Jomar and Uninoy of the United States, Battenffeld and Bekum of Germany, Procrea of ​​Italy, Toshiba of Japan, Nissei and Sumitomo Corporation. After years of research and development, China's injection blow molding machine has been commercialized from the host to the mold. Jiangsu Weida Machinery Co., Ltd. MSZ series square injection blow hollow plastic molding machine, horizontal three-station rotary device, a multi-cavity continuous production. Liuzhou Jingye Machinery Co., Ltd. independently developed a national patent WB series of horizontal injection blow hollow plastic molding machines, flip mold, suitable for production from 2mL -5000mL hollow products, each mold can produce 14-24 small bottles, daily production More than 100,000.

The development direction of injection blown hollow plastic molding machines is to shorten the molding cycle, increase the productivity of single-machine single mold, reduce the downtime of mold changing, increase the blowing speed, and optimize the heat transfer system to increase the output.

7 Rotational Molding Machines Rotary Molding Machines are most suitable for the production of very large hollow containers. Currently, oversized storage tanks with a size of more than 40m3 and small yachts with a complex length (6-8)m have been produced. The product has relatively uniform wall thickness, almost no internal stress, and little waste. It has obvious advantages for rotomolding and hollow molding of hollow heterogeneous shaped products that are difficult to be molded by other forming methods, and has great development prospects in the chemical industry in particular. All thermoplastic powdered plastics can be rotomolded and expanded into the cross-linked and thermoset plastics.

8 Conclusion This article discusses the status quo and development direction of hollow plastic molding machines in the packaging industry in China, fully illustrating the prospects for the development of hollow plastic molding machines in the packaging industry in China. At the same time, we should see the hollow plastics in the packaging industry in China. The gap between molding machines and industrial developed countries is large, and there are many tasks to be done. While digesting and absorbing foreign advanced technologies, we actively develop equipment that meets market needs and has potential development prospects. The development direction of the hollow plastic molding machine in the packaging industry is: multi-type, large-scale, high-efficiency, high-yield, high-speed, energy-saving, electrification, network diagnosis, and intelligence.