According to the number of its screw, extruder can be divided into single screw extruder, twin screw extruder and multi-screw extruder. Single screw extruder currently the most widely used, suitable for general material extrusion. Twin-screw extruder as the heat generated by friction with fewer materials, are more uniform shear, screw transmission capacity larger amount of stable extrusion, the material stays in the machine barrel length, mix well.
SJSZ series conical twin-screw extruder with a force out, high quality, adaptability, long life, shear rate is small, difficult to break down the material, mixing plastic performance, direct molding, powder, temperature controlled , vacuum exhaust and other devices. For tubes, plates, shaped wood and other products of production.
Either as a single screw extruder or molding plastics processing machinery pelletizing machine occupy an important position in industry in recent years, single-screw extruder has been greatly developed. Current German production of large grain with a single screw extruder, screw diameter of 700mm, output of 36t / h.
Single screw extruder main indicator of development in its key part - the development of screw. In recent years, people have done a lot of screw theory and experiment, has been nearly a hundred kinds of screw, has separated the common type, shear type, barrier type, shunt type and wave type.
The development of a single screw from the point of view, although in recent years, single-screw extruder has been better, but with the polymer materials and plastic products, constant development, but also emerged more new features and special single-screw screw extruder. Overall, single-screw extruder toward the high-speed, efficient and dedicated direction.
Twin extruder characteristics, and for powder processing, and the ratio of single-screw extruder have a better mixing, exhaust, response and self-cleaning function, characterized by poor thermal stability of the plastics processing and Total mixing time also demonstrated its superiority. In recent years foreign twin-screw extruder has been great development in various forms of twin-screw extruder has been serialized and commercialization, production companies are also more broadly categorized as follows:
(1) The relative position of two axes, a parallel and tapered to the other;
(2) by two screw meshing procedures, meshing and non-engagement type of points;
(3) by two screw rotation direction, to the same direction and different points in different again to the inward and outward to the other;
(4) by the screw rotation speed, high-speed and low speed to the other;
(5) by the screw and barrel of the structure, and composition of the overall points.
In the twin screw extruder, based on the thermal stability to more easily processed a total of poor mixing, and some manufacturers also developed a multi-screw extruder, extrusion machine, such as planetary
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