Generally, the temperature in the feeding section of the first stage screw should be higher in order to make the material melt as soon as possible, and the temperature in the exhaust section should be as low as possible within the allowable range. The most prominent, not only low Molecular volatiles, and when in contact with air, it is easy to absorb moisture.　　Exhaust injection molding machine and ordinary injection molding machine are mainly the difference between the pre-plastic process and its plasticized parts. During the operation, production interruption should be avoided as much as possible to prevent material degradation due to long-term stagnation. Exhaust injection molding has significant economic and social benefits: First, it eliminates the attached drying equipment and the plant area occupied by it, reduces the use of electricity for heating and drying, saves energy consumption, and improves the quality of the product, and the appearance quality is good , Dimensional stability, reduce scrap rate.　　

The basic process that the material goes through in the vented barrel is: plastic melting→compression pressurization→melt material decompression→gas expansion in the melt→exhaust→the material after exhaust is compressed again→measure. By the 1970s, the vented injection molding machine began to be developed, and the vented injection molding process was used to process products with high sub-content and volatile matter. In recent years, due to the promotion of energy saving and environmental protection, exhaust injection molding has been raised to a new level.　　4, can be processed and recycled materials and raw materials stored under bad conditions., affecting the external quality, and reducing the mechanical properties of the product, and affecting the internal quality.When many plastics leave the factory, there will be a small amount of monomers, fluxes and other low molecular volatiles, such as nylon (PA), polymethylmethacrylate (PMMA), polycarbonate (PC), etc.　　2.　　The advantages of vented injection molding: 　　1, can remove volatile substances to a minimum, improve the mechanical properties of the product, and improve the appearance quality.　　

Process notes: 　　1, the most important parameter of the exhaust injection molding process is the temperature of the barrel, especially the temperature of the decompression section.. Therefore, ordinary injection molding must be dried.　　3, the material does not need to be dried, reducing drying equipment, saving time and saving electricity. Monomers, solvents, and moisture will Plastic Injection Molded Automotive Parts turn into gases at the processing temperature, causing difficulties in processing, producing silver wires, stains, clouds, bubbles, etc.　　2, reduce defective products and increase production capacity

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