With the modern industrials development, the plastic products industry, agriculture and daily life, and other fields are widely used; quality requirements have become more sophisticated. Plastic products, the production and quality of mold design, advanced mold manufacturing equipment and reasonable processing, mold quality materials and modern equipment are molding quality plastic parts forming an important condition.
In the Injection Plastic Molding process, hot molten plastic is forced under pressure by a hydraulic ram into a closed mold. The mold is cooled to freeze the plastic in the desired shape, and no chemical reaction takes place.
Plastic Injection Molding Process, including pressure plastic, blow, extrusion, etc., plastic injection molding processing is the most commonly used methods, apply to all parts of thermoplastic and thermosetting plastics. With the injection mold industry, mold cavity mold and shape the increasingly complex, precision die increasingly high demands, the production cycle requirements become increasingly short.
Plastic Injection molding process demands precise control of melt temperature, melt viscosity, injection speed, injection follow-up pressure, switch over point from speed to pressure, cycle time. It is found that different polymers have different characteristics and different limitations in processing. Shear rate and shear stress influence melt temperature, viscosity, density and flow behavior of polymer. Some polymers are hygroscopic, some polymer have limited thermally stable time which is different at different temperature. Such polymers have limited residence time. The changes in each parameter has its own influences on other parameters.
Plastic injection molding process includes a number of factors, some of them are important. They play a decisive role for the quality in the plastic injection molding processing. Such as freezing time and injection time; maximum injection speed; maximum injection pressure; injection power; plasticizing rate; etc.
And plastic injection molding machine application shaping products directly affect the efficiency of production, quality and cost.
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