China's hollow plastic molding machines range from commercial level there
After nearly a decade of research, why our hollow plastic injection stretch blow molding machine has not yet reached commercial level? I believe that the following four main reasons.
Development of ideas because of some mistake
Development of hollow plastic molding machines, only to re-host enterprise development, neglect of mold development. Hollow plastic injection stretch blow molding machine is the host and die combination of equipment, from both the host and die importance of the machine, the host machine only 40%, while the mold to account for 60% of the whole machine . Host successfully developed, does not mean that the successful development machine, only the host and the successful development of mold are common to said hollow plastic injection stretch blow molding machine developed. Japan's "three-location" and Japan's refined style "four-station" type of technology is the key to mold, and some of our plastic machinery plant in the development of hollow plastic injection stretch blow molding machine process, not a correct understanding of both the host and die the relationship between, only cares about the development host, but did not die on the development of a more important role, the main cause of failure in this.
Technical level below standard mold
Injection Stretch Blow Molding Machine plastic injection mold tooling is different, has its own characteristics. Injection stretch blow mold hollow plastic molding machines, the key is injected parison mold, mold materials have special requirements for its performance, heat up shrink coefficient, heat transfer efficiency, heat transfer rate, the structure of the hot runner mold form. From the current technical level of China's mold, it can not meet quality standards development and fabrication of the injection stretch blow mold hollow plastic molding machines. It is understood that some plants on the injection stretch blow mold hollow plastic molding machines which mold materials are used unclear how it can develop a mold?
Missing input Mould Factory
Mould missing input to make the mold were not able to develop. It is understood that foreign development and fabrication of hollow plastic injection stretch blow molding machine mold factory, has its own hollow plastic injection stretch blow molding machine, mold developed on the test should be repeated in the host until the meet the requirements. But still no one dies plant for the development of injection stretch blow mold hollow plastic molding machines to buy hollow plastic injection stretch blow molding machine as the prototype device.
OEMs lack of cooperation with the mold factory
OEMs need to cooperate with the mold factory, division of responsibilities between the joint development, the risk. This is the overseas development of hollow plastic injection stretch blow molding machine experience. For example, the Japanese Aoki Corporation and Japan's precision solid company, both for their supporting mold factory, a request by the OEMs, mold plant development, and then offered to the users. Some OEMs and we own the "step" injection stretch blow mold hollow plastic molding machines still do not understand the situation, to save development costs, their manufacture of molds, the result, not only products not meet quality standards, but also the image of the host had a bad influence.
Some countermeasures
Mold is a "step" hollow plastic injection stretch blow molding machine for emphasis. Development of the "step" hollow plastic injection stretch blow molding machine injection molds the focus is the development of parison mold. Development of preform injection mold tooling materials focus, the design of hot runner nozzles and hot runner temperature control system. At present, China's "one step" injection stretch blow mold hollow plastic molding machines reach the level where technology, OEMs can cooperate with relevant foreign mold factory. As long as the mold to achieve the desired skills, coupled with our host, we can say, "Step" hollow plastic injection stretch blow molding machine is able to enter the market.
Focus on improving the speed molding. "Step" injection stretch blow molding hollow plastic molding machine main advantage is speed, so improving the speed of its pursuit of forming the main objective. French Side company whose model SBO-24DC stretching blow mold cavity number to 48, forming 0.5LPET production to 60,000 bottles / hour. The key is to improve the forming speed: optimizing heating system to reduce the heating time and improve the functioning of preform conveyor drive speed, fast and stable positioning to improve the performance of preforms, reducing blow mold opening and closing and clamping head down time, increase the number of molding cavities .
Preform quality testing equipment used. Preform quality testing equipment, domestic or blank. "Step" injection stretch blow molding machine plastic hollow preform used mostly purchased, so the quality of preform molding rate determines the finished product. Improve the forming rate of the premise, must test the quality of preform. Germany Kro Juan nes developed a preform quality inspection device can detect preform the concentricity, diameter and so the quality of detection of 72,000 preforms per hour, the device can be installed after the automatic stacking units can also be installed Contiform hollow plastic molding machines in the cross-feed wheel.
Strengthen the weak links. Multi-layer co-extruded hollow plastic molding machine is hollow plastic molding machines in the field of a weak link. Multi-layer co-extruded hollow plastic molding machine mainly in the following three points: First, study a range of co-extrusion die (die), to meet the different materials and different layers of requirements; II study combination of packaging systems, Depending on the raw materials it specially the number of combinations that can allow the nose; three product development focused on four to six varieties of co-extrusion molding machine of plastic fuel tanks hollow. With the improvement of environmental protection requirements, single tank can not meet the requirements of environmental protection, use of high barrier multi-layer tank has become a trend, for example, using the PE / tackifier / E-VAL / tackifier / Back materials / PE-HD for a total of six out of the tank. Increased stiffness of products, reducing product weight. The United States more than 90% car fuel tank multilayer co-extrusion molding of hollow plastic parts, worth learning and thinking. China's production of multi-layer co-extrusion of plastic fuel tanks of the hollow molding machine is mainly imported, domestic production of equipment still in the promotion stage.
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