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Plastic Injection Molding Is A Cyclic Process

Plastic injection molding is one of the main processing methods of plastic products, injection molding products accounted for more than 30% of the total weight of plastic products. Plastic injection molding is a very complex process. The molten or plasticized plastic material is first injected into or pressed into the mold, and the material is retained in the mold until it is copied into the shape of the mold cavity. Custom Injection Molding And Plastic Molding The mold can be composed of a single cavity, or it can be composed of several identical or different cavities, each of which is connected with the flow channel, and the molten plastic flows into each cavity through a runner. The processing method is one of the most economical methods for a single variety of production, and the three main processes of plastic injection molding are:

1. Heat the plastic to a temperature that can flow under certain pressure. Custom Injection Molding And Plastic Molding This process is called the plasticizing of the material (plasticized).

2. Plastic curing in the mold. The molten plastic from the injection cylinder of the injection moulding machine is fed into the mould cavity through various flow lanes, and finally the required workpiece is formed under the restriction of the cavity.

3. Stop heating to make the plastic curing, pressure cooling stereotypes become the required products, open the mold, remove the plastic parts.

Plastic injection process is a cyclical process, Custom Injection Molding And Plastic Molding the whole cycle can be summed up as shown in Figure o-l several major stages.

The main parameters and technological conditions of plastic injection molding process include injection pressure, mold temperature, molding cycle, temperature of injection plastic, flow rate of plastic in mould, Custom Injection Molding And Plastic Molding melt viscosity of plastic in mould and elastic shearing stress, melting and flow control and process control.

Plastic injection molding is a complex process, the entire process cycle is often a few minutes, the most critical mold filling process is generally only a few 10 seconds. Custom Injection Molding And Plastic Molding In this very short process cycle, plastic has undergone a very complex thermal history and rheological history.

The quality of injection molded parts is closely related to process conditions (temperature, injection pressure, molding cycle, etc.).


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