The injection pressure of injection pressure has a great influence

1) injection molding machine through the rotation of the screw, the material in the plasticizing forward at the same time, due to the higher temperature cylinder front-end, melting and cylinder friction coefficient is small, so the pressure drop caused by is smaller.2) the injection pressure determines the mold filling rate to a certain extent and affects the quality of the plastic parts.In the mold filling stage, the flow resistance is relatively large. When the injection pressure is low, the melting material is spread out, and the pouring gate is large. The mold cavity near the gate is low in temperature and the flow rate is gentle.When the injection pressure is high and the gate is deflated, the melting material is liquid flow, so that the bubbles and silver lines can be formed in the plastic parts of the air.3) on the molding stage, in order to improve the liquidity of the melt, increase the speed of filling mold, to reduce the shrinkage rate, can be appropriately increase injection pressure, but this model a one-way orientation, increase internal stress, therefore to such parts should be heat treatment.4) when the molten material is full of models, injection pressure (also known as pressure pressure) is generally equal to or slightly lower than the injection pressure, and can be adjusted as needed.High pressure pressure, will have more melt into the cavity, the resulting plastic parts high density, small shrinkage, good mechanical properties.However, when the pressure is too high, there will be a large residual stress, which will decrease the strength, and even make it difficult to release.