65 the development of the extruder

Italian 30 the first successful development of the 20th century, to the end of the 60 s of the rapid development of the early 70 s. On the counter and RPVC products development of rotating twin screw, the development of polymer modification of the contract to the following, to double screw extrusion theory research, formed a consensus around the world, and become a research hotspot. Conical twin screw extruder with parallel mesh differential rotating twin screw extruder is reducing gradually, a series of c-shaped chamber consists of two screw and machine barrel of feed materials in the feeding section, you can join the volume of powder is larger, and screw size, material to tighten, melting. On material, due to the diameter of the screw, screw thread of circumferential velocity, friction materials under low shear rate, heat is small, suitable for processing heat sensitive material, so it is mainly used for PVC powder processing, processed into products directly. Spiral curve correction measures, according to the theory of axial curve can use the screw theory, the meshing theory of space curve value of 0. Screw length to diameter ratio refers to the length and the diameter of the screw have powerusageeffectiveness. The general integral length to diameter ratio of twin screw extruder in 7 to 18. Modular twin-screw extruder, length to diameter ratio as a variable. From the development point of view, the trend of the length to diameter ratio increases gradually. Same direction of anisotropy, turning the screw. General synthetic rotated 65 extruder used for mixing, extruding machine rotating anisotropy of extrusion products.