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. Plastic Injection Molding The mould can be composed of a single cavity, or it can be composed of several identical or different cavities, each a-cavity is connected with the flow channel, Plastic Injection Molding and the molten plastic flows into each cavity through the flow channel. 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. 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 molding machine is fed into the mold cavity through various flow lanes, Plastic Injection Molding and the desired workpiece is formed at the end 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, the entire cycle can be summed up in 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, Plastic Injection Molding flow rate of plastic in mould, melt viscosity of plastic in mould and elastic shearing stress, melting and flow control and process control.
The efficiency and quality of plastic injection molding depends mainly on the design of the mould. In the design of injection mold, we should first consider various process conditions commonly used in injection molding process, according to the existing processing and molding technology and product shape to determine the design plan.
Plastic injection molding is an important thermoplastic molding method, Plastic Injection Molding in the machinery industry, automotive industry, home appliance industry, aerospace industry, biological field and the production of daily necessities are widely used. Compared with other molding process has many obvious advantages: its production of plastic parts with high precision, high complexity, beautiful appearance, low price, Plastic Injection Molding durable characteristics. and plastic parts applicable to a wide range of good assembly and interchangeability, easy to achieve standardization, serialization, standardization. In addition, the injection molding machine is easy to operate, the mold replacement is convenient, the production cycle is short, the injection process can be achieved automation, Plastic Injection Molding coupled with high production efficiency, good economic benefits, therefore, injection molding has become the most widely used plastic molding method.