Twin screw host, Shandong twin-screw host, twin-screw host manufacturer, twin-screw host features:
1. In twin-screw extruder, the wear of screw and barrel is much more serious than that of single screw extruder. For this reason, the metal cylinder with wear-resistant and corrosion-resistant high-strength alloy coating is used abroad, and the screw is made of nitrided steel. After nitriding, the bottom and periphery of screw groove should be plated with hard chromium or nickel to facilitate material flow and corrosion resistance. The top and back of screw edge can be overlaid with wear-resistant alloy or nitrided.
2. With the increase of length diameter ratio and screw speed of twin-screw extruder, the friction heat generated by screw work increases correspondingly, and the requirement for heat dissipation capacity of the machine is also improved. At the same time, the constant temperature of screw is one of the effective measures to improve the output. When the heat carrier is applied, the structure of its flow channel should be able to ensure the uniformity of screw temperature, so as to eliminate the fluctuation of material temperature and stabilize the product quality.
3. The output of twin-screw extruder has nothing to do with the head resistance, but only depends on the screw speed. Of course, the speed of the screw can not be increased infinitely. It is not only limited by the plasticizing quality and temperature uniformity of the material, but also the high screw speed will accelerate the wear of the screw and barrel. The twin-screw extruder is suitable for the forming of PVC profiles, because it can produce high-quality plastic products with high head resistance.
4. The twin-screw extruder adopts special geometry twin-screw structure, which can produce special impact resistant PVC pipes.