How does a flat twin-screw extruder work?


  flat twin screw extruder, Also called parallel twin-screw extruder, is an experimental equipment for large-scale production and research and development. It has a wide range of uses and can process various materials. The following is about the working principle of the parallel twin screw extruder and its aspect ratio.

Flat twin-screw extruder is developed on the basis of single-screw extruder. Because of its good feeding performance, mixing and plasticizing performance, exhaust performance, extrusion stability and other characteristics, it has been widely used in the molding of extrusion products. Extrusion molding is under certain conditions will have a certain plastic through a continuous extrusion, so that it has a certain cross-sectional shape of the product process.

The system structure of the flat twin-screw extruder varies according to the application field and operating characteristics. According to the steering mode, it can be divided into reverse direction rotation and the same direction rotation. According to the form of meshing can be divided into meshing type and non meshing type. The meshing mode can be divided into full meshing and partial meshing. Flat twin-screw extruders have been widely used due to their many advantages. For example, it is easy to open, so that the degree of wear of the threaded element and the barrel liner can be detected at any time, so that effective maintenance or replacement can be carried out. Problems with extruded products will not be found, causing unnecessary waste.

In the maintenance of the equipment, the heating and cooling system of the ordinary flat twin-screw extruder is often removed first, and then the entire screw is drawn out. No need to dismantle the twin screw. As long as you loosen a few bolts, turn the worm gear box handle device, and lift the upper part of the extension cylinder, the entire cylinder can be opened and repaired. This not only shortens the maintenance time, but also reduces the labor intensity. The main material of the bimetallic screw is high-quality alloy steel, chromium-molybdenum alloy steel, and nickel-based alloy. According to customer needs, it is a special alloy material that is evenly coated on the screw in a special way. The screw is seamlessly connected with the alloy material to achieve special properties such as no water seepage, wear resistance, and corrosion resistance.

Flat twin screw extruder is suitable for all kinds of glass fiber, plastic and PPA, PO, PPS, LCP, ABS fire prevention, wood powder, magnetic powder, PC and other special engineering plastics. A good screw for the correct operation of machinery should ensure better product quality and higher service life. The bimetallic screw adopts special processing technology to improve its own corrosion resistance, wear resistance and mechanical properties, and reduce Energy consumption has become a more practical screw type. Bimetal screw, with good wear resistance, corrosion resistance, low production cost, adjustable length. When the bimetal screw rotates, the surface of the screw shell in contact with the discharge tube is nickel-based alloy powder. Due to the high hardness of the nickel-based alloy powder, the shell is not easy to wear, which effectively improves the service life of the bimetallic screw and reduces the use cost of the bimetallic screw.

The bimetallic screw mainly includes a nut and a screw body. The surface of the screw body and the screw edge is coated with a layer of cobalt and tungsten carbide composite powder coating, so that the screw has good wear resistance and corrosion resistance, and the service life of the screw is prolonged; The internal setting of the body is hollow to reduce the cost, and the internal steel bar is provided with a cross, which can ensure that the screw has sufficient strength during the working process.

Keywords: How does a flat twin-screw extruder work?

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