The polymer melt pump is mainly used for the transportation, pressurization, and metering of high-temperature and high viscosity polymer melts. Widely used abroad for extrusion molding of plastic, resin, rubber, and chemical fiber products. Such as: granulation, film, pipe, plate, sheet, artificial fiber, Optical fiber, medical plastic conduit and other industries.
1. Reduce the dimensional tolerance of extruded products and improve product extrusion rate;
2. Used in conjunction with co rotating twin screw extruders to reduce energy consumption;
3. Shorten production cycle and save energy;
4. Small footprint, more precise and easy to control cross-sectional dimensions of extruded products;
6. Advantages such as extending equipment life and reducing costs.
When extruding thin films and thin-walled profiles, using a melt pump has the best effect. Because using a melt pump can homogenize plastic melt and reduce the fluctuation of melt pressure and flow rate conveyed by the extruder, it plays a decisive role in obtaining high-quality products, especially products with uniform thickness. In particular, the production of films or ultra-thin films such as PET, PS, PP, PA and other highly oriented films is particularly sensitive to the instability of melt pressure and flow. If there is an excessive pulsation amplitude or the raw materials are polluted by impurities or form gel particles, it is easy to reduce the quality of melt refining and homogenization. In fact, it is impossible to produce high-quality oriented films under a stable process state, and melt pump in extruder can solve this problem.
Although plastic extrusion melt pumps have been widely used in plastic extrusion systems, their application in processing plastics containing fillers or special modifiers is still limited. They have strict requirements for the dispersion of each component, compatibility with plastics, and abrasion resistance. Materials containing large particles, abrasive fillers, or reinforcing agents cannot be processed using an extruder equipped with a melt pump, as the contained filler particles can easily form material plugs, which cannot pass through the teeth gap of the meshing gear of the melt pump. Moreover, blockage of the material plugs and abrasive wear of the teeth can quickly damage the melt pump. In addition, dispersed mineral fillers can also cause the above results, as their compatibility with plastics is poor, and they cannot be sheared in the high-speed shear zone, gradually forming plugs that can damage the melt pump.
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