Melt pump is mainly used for conveying, pressurizing and measuring high temperature and high viscosity polymer melt. The melt pump will come from the extruderThe high temperature plastic melt is pressurized and stabilized, and the flow rate is stable into the extrusion head. It stabilizes melt pressure and flowCapability is superior to all types of extruders. It is widely used in extrusion molding of plastic, resin and rubber products abroad.Such as: granulation, film, pipe, plate, sheet and other industries. With the increasing development of machinery industry, melt pump inThe domestic market is also gradually adopted by insiders, application.
Melt pump is mainly used for conveying, pressurizing and measuring high temperature and high viscosity polymer melt. The melt pump will come from the extruderMelt pump belongs to positive displacement gear pump, using a cylindrical gear (straight teeth, helical teeth, herringbone teeth) phaseTo rotate to transport high viscosity fluids. All gears and mating surfaces are finely ground and assembly clearance is strictly controlledTo get accurate flow. According to different working conditions, gear and pump body are divided into MP-M series, MP-C series,Mp-h series, MP-X series. When the melt pump is used in series with single screw or twin screw extruder, it can make the wholeThe main benefits of using melt pump are boosting and stabilizing the pressure.
When the melt pump is working, when the material at the exit of the melt pump is subjected to the resistance caused by the forming mold, the teeth in the melt pumpThe wheel is like a piston in a cylinder, which exerts an extrusion effect on the melt in the discharge area to realize the pressurization function of the melt pump.This can solve the problem that the pressure built by the extruder cannot meet the actual demand of the production process in the production processThe topic. At the same time, the gears in the pump act as a rotating barrier, effectively blocking the pressure in the feed zoneFluctuation, flow fluctuation on the discharge area, thus stabilizing the pressure fluctuation.
Under the action of the motion mechanism of the internal screw of the extruder, the pressure of the melt at the head of the extruder usually shows a pulse fluctuation. This fluctuation can not be eliminated by its own PID adjustment, if the back of the nose is installed in the Haike melt gear pump, then the continuous meshing between teeth can be carried out, so as to eliminate the pressure fluctuation of the material for continuous and stable extrusion.
For subsequent processes, it is important to ensure a smooth flow of materials and to reduce fluctuations in melt pressure to ensure a more stable product size. The smaller the fluctuations in melt pressure, the more uniform the thickness of the tube and sheet, and in the case of the fiber optic cable, the more precise the size control.
In general, the melt gear pump can assist in the task of generating pressure, which allows the extruder to feed, melt, and mix "with concentration." In the absence of a melt gear pump, a large amount of pressure is generated at the head of the extruder. When the melt gear pump is installed, the pressure peak is behind the pump rather than in front of the pump, which causes the pressure inside the extruder to drop. Because the extruder does not have to produce high pressure, the shear strength of the corresponding melt decreases, the temperature curve flattens out, and the temperature rise decreases. In terms of the torque of the extruder, this will reduce the energy consumption.
When the extruder has been running for several years, there will be a lot of wear and tear between the screw and the barrel inside the extruder, resulting in an increase in the clearance. In this case, the amount of melt returned increases as the head pressure increases during production. As a result, production will decline relative to new screws. This problem can be ameliorated by installing a Heco melt pump to reduce backflow.
