The so-called plasticizing, refers to the plastic raw materials in the barrel is heated to the flow state, then push the screw rotation or plunger, the molten material to process component uniformity and good plasticity. Although the plastic injection molding process in a preparation stage, but melt plasticization obtained, has a non negligible effect on injection molding process followed and the quality of plastic parts.
  1.The basic requirements for plastics. Before entering the cavity should reach the molding temperature shall melt, and the temperature should be uniform, molding temperature each kind of plastic has its own the most appropriate, beyond this range, forming quality will be greatly affected, therefore, let the frit to uniform the prescribed temperature into the mold cavity, the brush operation is the main requirement. No or minimal thermal decomposition phenomenon. Heat tolerance of different varieties of plastic is not the same, when the temperature is too high, exceeding the plastic heat range, it will decompose, volatile gas, the gas filled in the die cavity, as if the row, extremely easy to cause the plastic parts quality problems, in addition, the solution of melt overheating causes, will make the molten the material quality is bad, will affect the quality of. Thermoplastic plastics due to the poor thermal conductivity of materials, to achieve uniform melting is a quite complicated problem, plasticizing process method, heating method and heating time and other factors have great influence on the plasticizing quality.
  2.Effects of plasticization of injection molding equipment. Used in plastic injection molding equipment are mainly two categories: plunger type injection molding machine and screw type injection molding machine. Mobile only plastic plunger type injection molding machine by pushing the plunger, almost no mixing, flow of plastic in the barrel in laminar flow, is not conducive to heat conduction, is not conducive to reducing the temperature difference. In addition, the thermal conductivity of plastic itself, the heat required to melt the plastic mainly rely on external heating cylinder, it is easy to make near cylinder wall temperature is high, the center temperature is low, the formation temperature. The plastic parts with the uniform melt molding of poor, the appearance quality, mechanical performance is not good, and the internal stress of plastic parts is large, large deformation. Because the plunger type injection molding machine itself has many defects, so at present is only part of the small injection molding machine. Screw injection molding machine. This is a widely used all kinds of injection molding machine in the form of. The main working parts is a rotation of the screw, it push forward plastic raw material, in the process of pushing, plastic raw materials are gradually compaction. In the barrel of the common function of the rotary heating and screw shear heat, raw materials gradually melt into a viscous state, and in the screw stirring, mixing and shearing, achieve uniform plastic