What are the processes and machines used in the manufacture of plastic products?,
Processing methods are: injection molding, extrusion, blow molding, blister and so on. Injection molding can be used to produce more complex shapes, such as TV housings. It is the plastic particles in the pre heating tube, and then through the screw under pressure, the melting of raw materials into the mold, cooling molding, the product has been made. Is prepared by continuous extrusion screw drive, which in the feed pipe (commonly known as the barrel) heating plasticization, and then squeeze the stereotypes in the mold, the desired shape, such as plastic buckle, pipes etc.. Blow molding and extrusion are somewhat similar, except that they are placed in compressed air to obtain shapes, such as plastic films, plastic bottles, etc.. Blister is relatively simple, it first made of plastic sheets, baking oven, and then placed in the mold, through the negative pressure to the sheet and mold close to the shape. The price of the equipment varies greatly according to the model and specifications, so it can be checked directly to the manufacturer.
In recent years, the proportion of plastic products is increasing rapidly in many fields, such as household appliances, instruments and meters, building materials, automobile industry, daily hardware and so on. The requirement of high precision and high performance of plastic products increases with each passing day, which makes the precision forming technology progress constantly. Injection molding is one of the most important plastic forming methods, and many factors affect the precision injection molding. 1. in the early stage of the design of plastic products, injection molding materials should be selected according to their application environment. 2. precision molds, rational design of precision injection mold is the basis and necessary prerequisite for precision products. Precision molds are indispensable to produce precision products. The precision of the die is usually affected by the temperature control of the die, the precise manufacture of the die and the choice of the plastic shrinkage when the die is designed. 2.1 control of the mold temperature due to the effect of mold temperature on shrinkage molding, but also directly affects the mechanical properties of plastic products, can also cause various defects of product surface flooding, so must keep mold in the specified temperature range, but also to make the mold temperature changes over time. In the injection molding of general precision parts, the temperature of the die is controlled mainly to increase productivity. But the impact of temperature control of mold for injection molding is great, it affects parts of the shrinkage, shape, crystallization, internal stress, so the design of mold hot loop temperature distribution at the request reasonable precise control accuracy, the best use of mold temperature machine and cold water machine control.
