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What are the main points for plastic injection processing

In the process of injection molding, it is a complex process from the granule to the molten state of plastic to the molding of injection molding products. This process will produce complex physical and chemical changes, and it is also a relatively complex stage of injection molding process.
I. the injection molding materials shall be in the melting state with the lowest viscosity in the cylinder of the injection molding machine. When the molten plastic flows through the nozzle and the mold passage with small cross section at high speed, the temperature rises from 70-90 to about 130, reaching the critical curing state, which is also the transition point of the best material flow state. At this time, the injection pressure is between 118-235mpa, and the injection speed is generally 3-4.5m/s.
Two: thermosetting plastic contains more than 40% of the filler, viscosity and friction resistance is large, the injection pressure should be correspondingly increased, half of the injection pressure to be consumed in the casting system on the friction resistance.
Three: raw materials in the curing reaction of water and gas, the cavity must have a good exhaust structure, otherwise in the injection molding parts surface will leave bubbles and other defects.
Therefore, we should make some preparations in advance in the process of injection molding processing and production, and have understood the technological requirements of each injection molding product, so as to ensure the quality requirements of the product.
Next article：The impact of the pressure of the plastic machine on the molding process
Last article：We need to pay attention to engineering plastic injection
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