What are the process characteristics of the exhaust injection molding machine screw?
Process characteristics of the exhaust injection molding machine screw:
1, the machine temperature and pressure distribution, the barrel temperature and pressure distribution of the vented injection molding machine have a greater impact on the exhaust injection molding, the venting injection molding machine's simple temperature and pressure on the screw barrel The four-stage temperature zone corresponds to the four main functional zones on the exhaust screw: feed, plasticize, vent and pump out.
2. If the vented injection molding machine is not equipped with a potting device, the temperature in the feed zone can generally be used to modify the useful delivery power of the material and then modify the fullness of the venting section.
3, the temperature of the plasticizing zone should be set to meet the melting of the tomb of the first-stage rod homogenization section, and sufficient melt temperature to ensure sufficient exhaust, but at the same time avoid excessive temperature in the plasticizing zone. This causes the material to degrade or cause excessive foaming.
4, the temperature of the exhaust zone should be set to maintain the required melt temperature, generally lower than the plasticizing section temperature; the final pumping temperature, that is, the final melt temperature required for molding should make the melt have a lower Temperature to reduce the pressure drop at the time of injection.