The nozzle temperature of the injection molding process is usually slightly lower than the barrel temperature


Each kind of plastic has a different flow temperature. The same kind of plastic has different flow temperatures and decomposition temperatures due to different sources or brands.

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  Each kind of plastic has a different flow temperature. The same kind of plastic has different flow temperatures and decomposition temperatures due to different sources or brands. This is because the average molecular weight and molecular weight distribution are different. Plastics are plasticized in different types of injection molding machines. The process is also different, so the choice of barrel temperature is also different.

  Nozzle temperature for injection molding

  The nozzle temperature of the injection molding process is usually slightly lower than the barrel temperature, which is to prevent the possible "salivation" of the melt in the straight-through nozzle. The nozzle temperature should not be too low, otherwise, it will cause premature solidification of the melt and nozzle blockage, or premature condensation into the cavity and affect product performance.

  The temperature of Crate Mould

  The mold temperature has a great influence on the internal performance and apparent quality of the product. The temperature of the mold depends on whether there is the crystallization of the plastic, the size and structure of the product, performance requirements, and other process conditions (melt temperature, injection speed, and injection pressure, molding cycle, etc.).

  Injection pressure control

  The stress in the injection molding process includes plasticizing pressure and injection pressure, which directly affects the quality of plastics and products.

  During the operation of the screw injection machine, the pressure generated by the melt at the top of the screw when the screw rotates is called the plasticizing pressure, also known as the backpressure. The size of this pressure can be adjusted by the relief valve in the hydraulic system. In injection, the size of the plastic pressure needs to be changed with the design of the screw, product quality requirements, and different types of plastics. If these conditions and the speed of the screw remain unchanged, then increasing the plastic pressure will strengthen the shearing effect, that is, it will Increasing the temperature of the melt will reduce the plasticizing efficiency, increase the reverse and leakage, and increase the driving force.

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