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OEM Personalized double injection Direct Distributor
OEM Personalized double injection Direct Distributor:The pressure during injection includes plasticizing pressure and injection pressure, which directly affect the plasticizing effect and product quality of plastics. 1. Plasticizing Pressure: (back pressure) when using a screw injection machine, when the screw rotates backwards, the pressure melting at the top of the screw is called plasticizing pressure, also known as back pressure.
OEM Personalized double injection Direct Distributor
The size of this pressure can be adjusted by a safety valve in the hydraulic system. During the injection process, the size of the plasticizing pressure varies depending on the design of the screw, product quality requirements and the type of plastic. Under the condition that these conditions and the speed of the screw remain unchanged, the increase of the plasticizing pressure will enhance the shear effect, that is, increase the melt temperature, but reduce the plasticizing efficiency and increase the countercurrent.
and leakage current, increasing the drive power. In addition, increasing the plasticizing pressure can make the melt temperature uniform, uniform mixing color, melt gas emissions uniform. In general operation, the lower the plasticizing pressure, the more guaranteed the quality of the product.The specific value of plasticizing pressure varies with the type of plastic used, but rarely exceeds 20 kg/cm.
2. Injection pressure: In the current production, injection molding machine injection pressure is almost all with a plunger or screw top molding. The pressure applied (converted from the tubing pressure) is accurate. The role of injection molding pressure in injection molding is to overcome the flow resistance of plastic from cylinder to cavity, to give the filling rate of melt, so that the melt is dense.
