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      the back pressure
      date:2013/8/268
      a, increase the back pressure can increase the screw on the work done by the molten resin to remove the plastic particles without melting, increasing raw material tube density and uniformity;
      b, back pressure is being applied to improve the barrel temperature, the effect is most significant;
      c, back pressure is too large, the higher the heat-sensitive plastic decomposition, the low viscosity of the plastic may cause salivation phenomenon, back pressure is too small, injection molding of the finished product may be air bubbles.
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