injection molding machine pressure control

Date：2016-06-30 16:26:35

injection molding machine pressure control: pressure injection molding process includes two pressure plasticizing and injection pressure, and directly affects the quality of plasticizers and plastic products.
         1, injection molding machine plasticizing pressure: when (backpressure) using screw injection machine, the top of the screw in the screw rotates melt pressure exerted retreat called plasticizing pressure, also known as back pressure. The magnitude of this pressure is through the pressure relief valve in the hydraulic system to be adjusted. In the vertical injection molding machine, the size of the plasticization pressure i.e. when the temperature of the melt increases with the rotational speed of the screw is constant, the increased plasticizing pressure, but reduced plasticizing speed. In addition, increased pressure often make the plasticizing temperature of the melt evenly and uniformly mixing the toner discharge gas in the melt. General operation, the pressure should be decided plasticized guarantee excellent product quality premise as low as possible, the specific values ​​are used in plastics with different varieties, but usually little more than 20 kg / sq cm.
         2, injection molding machine injection pressure: In the current production, the injection pressure is almost all vertical injection molding machine are based on the plastic screw top plunger or the applied pressure (translated by the line pressure to come) prevail in . In the vertical injection molding machine injection pressure in the role, the plastic from the barrel to overcome the flow resistance of the flow of the cavity, given the rate of the melt and filling the melt on compaction.

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