As the melt pump is continuously working under the condition of high temperature and high pressure, and the delivered plastic melt generally has high viscosity and some also has certain corrosiveness, therefore, the material of the melt pump is required to be resistant to temperature and wear , Corrosion-resistant, to have sufficient strength and dimensional stability. Usually the pump is mainly made of alloy tool steel, gear and shaft into one, so that work under high torque conditions more reliable.
Temperature wear-resistant melt pump lubrication and sealing problems more complicated, in order to avoid contamination of plastic melt, it can not use the general lubricants or grease lubrication, but through the transport of plastic melt lubrication. Therefore, the pump bearing and seal structure must be adapted to the specific properties of the plastic melt. Small and medium-sized pumps generally use electric heating heating insulation, large pumps are used jacketed pump fluid insulation.
