Extruders Generally by screw
Single screw extruder as a common extruder equipment for the plastics processing industry, mainly used for extrusion of soft, hard polyvinyl chloride, polyethylene and other thermoplastic, can be processed a variety of plastic products, such as blown film, Squeeze pipe, platen, ribbon, etc., can also be used to melt granulation. Plastic extruder design advanced, high quality, good plastic, low energy consumption, the use of involute gear drive, with low noise, smooth operation, bearing capacity, long life and other characteristics.
Single screw extruder generally according to the screw diameter size, pitch, screw depth to determine the effective length of three sections, each one-third division is divided into the transmission section, compression section, measurement section. The conveying section starts from the last thread of the notch, mainly preheating, compressing and completing the conveying task. And the second paragraph is the compression section, the temperature to achieve the degree of plastic material, mainly compressed plastic materials will be transported to the third paragraph. The third paragraph is the measurement section, the material to maintain the plasticization temperature, accurate, quantitative delivery of melt materials used to supply the nose.
Single screw extruder features include: hard tooth gear box, AC or DC stepless speed control; new screw structure, melt and mix evenly to ensure low melting temperature and high yield; screw barrel high hardness; heater can be required Using air-cooled and water-cooled; advanced electrical control system.
High efficiency single screw extruder adopts two-step overall design, strengthened the plasticizing function, can guarantee high-speed high-performance stable extrusion, special barrier integrated mixing design, to ensure the material mixing effect, high shear low melt The temperature guarantees the high performance of the material at low temperature and low pressure metering. High-speed, high-yield extrusion on the basis of high straightness is its main characteristic and main design idea.
The main purpose of single screw extruder is pipe extrusion, such as PP-R pipe, PE gas pipe, PEX cross-linked pipe, aluminum-plastic composite pipe and co-extruded composite pipe; sheet and sheet extrusion, such as PVC, PET, PS, PP, PC and other profiles and sheet extrusion; profile extrusion, suitable for the production of PVC, polyolefin and other plastic profile; modified granulation, for a variety of plastic blending, Enhanced granulation. In addition, single screw extruders can be used in all thermoplastic extrusion, extrusion granulation. Single-screw extruder design concept is mainly based on high-quality high-speed, high-yield extrusion; low-temperature plastic, high-quality products to ensure the extrusion; strengthen the plasticization function, comprehensive mixing design to ensure that the mixing effect of materials ; Unique inlet design, with a perfect water cooling device; enhanced feed function.
Single screw extruder is a common type of plastic extrusion unit, its main technical parameters are extruder production capacity Q, nominal specific power, screw length to diameter ratio L / Db, screw diameter Db, drive screw motor Power P, screw speed range nmin-nmax r / min.
Single screw extruder in plasticizing granulation machinery and forming processing machinery have an important position, nearly a few years, single screw extruder has been greatly developed. At present the production of large-scale granulation with a single screw extruder, screw diameter of 700mm, the output of 36t / h.
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