The plastic molding processing equipment is developed on the basis of rubber machinery and metal die casting machine. Since the 1870s, the polymer injection molding process and molding equipment got faster development, as an industry, until the 1930s,plastic molding machine equipments gradually became commercialization and the injection molding and extrusion processing have become the industrialized methods. Blow molding is the third-largest plastic molding method after the injection and extrusion, and it is also the fastest- development plastic molding method.
Overview of Plastic Molding Machinery
The working principle of plastic molding machine is relatively complicated, details are as follows: First, form the molded parison, then use the compressed air (with the stretch rod) to radially blown up the (with axial stretching) parison, so that make it stretch tightly with the blow-mold cavity, give the shape of the mold cavity and dimensions to the products and cool it. According to the parison molding method, blow molding can be divided into the extrusion blow molding and injection blow molding; the cost and energy consumption of extrusion blow molding equipment is low, it can be formed the large-volume container with shape of complex products; as for the injection blow molded container, it has a high dimensional accuracy, without forming seam, and generally do not produce the scrap. Multilayer blow molding has coextrusion blow molding and co-injection blow molding; and the stretch blow molding has injection stretch blow molding and extrusion stretch blow molding. Stretch blow molding can be divided into the one-step and two-step molding methods. In the one step method, because of the cooling, heating, stretching and blow and out of the container of parison molding are followed by the completion in a mechanical equipment, the cost and energy consumption is lower,so plastic injection molding machine can just be used for small batch production; in the two-step method, due to the parison molding and parison reheating, stretching and blow molding are completed in two mechanical equipments, and they have high yield, so it is suitable for mass production. Plastic blow molding machinery is one of the fastest growing and widely used models in plastics processing industry.
Plastic Molding Machine Industry Outlook
In recent years, plastic molding technology has closer relationship to molding machinery. Plastic performance and molding technology continues to improve, requires the molding processing machinery, and the surrounding mechanical accompanying advances in processing machinery promote the progress of processing technology into m. Molding machines. For the past 20 years, the molding machine develops toward the direction of miniaturization and automation. With the rapid development of the national economy and science and technology, we believe that in the near future, plastic molding machinery will get more rapid development.
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