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Development ideas have misunderstandings to develop hollow plastic molding machines. Enterprises only focus on host development and neglect mold development. The injection-blown hollow plastic molding machine is a combination of the main machine and the mold. From the importance of the main machine and the mold to the whole machine, the main machine only accounts for 40% of the whole machine, and the mold accounts for 60% of the whole machine. . The successful development of the mainframe does not mean that the development of the whole machine is successful. Only when the host and the mold are jointly developed successfully, can the development of the injection blown hollow plastic molding machine be successful. The key technology of Japan’s “three-station†and Japan’s Japanese-style “four-station†models is the mold, and some of our plastic machinery factories did not correctly recognize the host and mold during the development of the injection-blown hollow plastic molding machine. The relationship between the people only pays attention to the development of the host, but does not put the development mold in a more important position. The main reason for the failure is here.
The technical level of the mold does not meet the requirements. The mold for the injection-blown hollow plastic molding machine is different from the injection molding mold and has its own characteristics. In the mold of the blow molding hollow plastic molding machine, the key is to inject the mold of the parison. The material of the mold has special requirements for its performance, the heat expansion and contraction coefficient is small, the heat transfer efficiency is high, the thermal conductivity is high, and the structure of the mold is heat flow. Road form. From the current level of mold technology in China, it is still impossible to develop a mold for producing a blow-molded hollow plastic molding machine that meets the quality standards. It is understood that some mold factories do not know which kind of material to use for the injection molding blown hollow plastic molding machine. How can we develop the mold?
The mold factory lacks input into the mold factory and lacks input, so that the mold technology level cannot be developed. It is understood that the mold factory that develops and manufactures injection-blown hollow plastic molding machines abroad has its own injection-blowing hollow plastic molding machine, and the developed molds must be repeatedly tested on the main machine until the requirements are met. However, there is not a mold factory in China that has purchased a injection-blown hollow plastic molding machine as a prototype equipment for the development of a mold for injection-blowing hollow plastic molding machines.
There is a lack of cooperation between the main engine factory and the mold factory. The main engine factory and the mold factory must cooperate. Each of them has a division of labor and joint development, each taking risks. This is the experience of developing a blow molding hollow plastic molding machine abroad. For example, Nippon Aoki Co., Ltd. and Nippon Nissei Co., Ltd. all have mold factories for them. The main engine factory requests them, and the mold factory conducts research and development, and then hand them over to users. However, some of our OEMs are still not familiar with the “one-step†injection molding of hollow plastic molding machine molds. In order to save development costs and manufacture molds themselves, not only do products fail to meet quality standards, but also The image of the host has had a bad influence.
Several countermeasures molds are the focus of the "one-step" injection-blowing hollow plastic molding machine. The focus of the development of the "one-step" injection-blown hollow plastic molding machine mold is to develop a mold for injection molding. The development of injection parison molds focuses on the material of the mold, the design of the hot runner nozzle and the hot runner, and the temperature control system. At present, in the case of China's "one-step" injection molding of hollow plastic molding machine molds can not reach the technical level, the OEM can cooperate with foreign mold factories. As long as the mold reaches the required technical level, coupled with our mainframe, it can be said that the "one-step" injection-blowing hollow plastic molding machine is able to go to market.
Focus on improving the molding speed. The main advantage of the “one-step method†injection-blown hollow plastic molding machine is that the molding speed is fast, so increasing the molding speed is the main goal of its efforts. The size of the stretch blow mold cavity of the model SBO-24DC of France Side is 48, and the output of the molded 0.5L PET bottle reaches 60,000 / hour. The key to improving the forming speed is to optimize the heating system to reduce the heating time, improve the running conveying speed of the preform, improve the performance of the preform's rapid and stable positioning, shorten the opening and closing of the mold and the lifting time of the blow molding head, and increase the number of forming cavities. .
A preform quality inspection device is used. The preform quality inspection device is still blank in China. The preforms used in the "one-step" injection-blown hollow plastic molding machine are mostly purchased, so the quality of the preform determines the molding rate of the finished product. To improve the molding rate, the quality of the preform must be tested. Germany Kroé„„nes has developed a preform quality inspection device that can detect the concentricity, inner diameter and other quality of the preform, and can detect 72,000 preforms per hour. The device can be installed after the automatic stacking table or can be installed. On the cross feed wheel of the Contiform hollow plastic molding machine.
Strengthen weak links. The multi-layer co-extrusion hollow plastic molding machine is a weak link in the field of hollow plastic molding machines. The research on multi-layer co-extrusion hollow plastic molding machine mainly has the following three points: First, study a certain range of co-extrusion heads (dies) to meet different materials, different layers and other requirements; Second, study the combined packaging system, It can manufacture the number of joints that can be allowed according to different raw materials. Third, the focus of developing product varieties is four to six layers of co-extruded automotive fuel tank hollow plastic molding machine. With the improvement of environmental protection requirements, single-layer fuel tanks have been unable to meet the requirements of environmental protection. The use of high-barrier multi-layer fuel tanks has become a trend, for example, using PE/tackifier/E-VAL/tackifier/back The six-layer co-extruded fuel tank of the material/PE-HD. The rigidity of the product is increased and the weight of the product is reduced. More than 90% of the US automobile fuel tanks use multi-layer co-extruded hollow plastic molded parts, which is worth learning and thinking. China's hollow plastic molding machines for producing multi-layer co-extruded automobile fuel tanks are mainly imported, and domestically produced equipment is still in the promotion stage.
Why can't hollow plastic molding machines in China reach the level of commercialization?
After nearly ten years of development, why is China's injection-blown hollow plastic molding machine still not at the level of commercialization? The author believes that there are mainly four reasons.