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- As a common extruder equipment used in the plastic processing industry, what are the principles and structures of a single screw extruder? Below is an analysis of the principle of a single screw extruder from the conveying section, compression section, and metering section of the extruder. Single screw extruders are generally divided into three effective lengths, determined by the diameter, pitch, and depth of the screw, with each segment accounting for one-third of the total length. The high-efficiency single screw extruder adopts a dual stage integrated design, which enhances the plasticizing function and ensures high-speed, high-performance and stable extrusion. The special barrier comprehensive mixing design ensures the mixing effect of the material, and the high shear and low melting plasticizing temperature ensures the high-performance, low-temperature and low-pressure metering extrusion of the material.
Design concept and characteristics: High speed and high-yield extrusion based on high flatness. The last thread of the feeding port is called the conveying section
The material here is required not to be plasticized, but to be preheated and compressed and compacted. In the past, the old extrusion theory believed that the material here was loose, but later it was proven that the material here is actually a solid plug, which means that the material here is a solid plug after being compressed. Therefore, as long as the conveying task is completed, its function is fulfilled.
Principle of single screw extruder: The second stage is called the compression stage
The volume of the screw groove gradually decreases from large to small, and the temperature needs to reach the degree of material plasticization. Compression occurs here from the conveying section three, where it is compressed to one. This is called the compression ratio of the screw -3:1. Some machines also have changes, and the material that has completed plasticization enters the third section. bbs.weiyuanshebei.com
Principle of single screw extruder: The third stage is the metering stage
The material here maintains the plasticizing temperature, just like a metering pump that accurately and quantitatively delivers molten material to the machine head. At this time, the temperature cannot be lower than the plasticizing temperature, usually slightly higher.
The single screw extruder is mainly used for extruding thermoplastic materials such as soft and hard polyvinyl chloride, polyethylene, etc. It can be used in conjunction with corresponding auxiliary machines (including molding heads) to process various plastic products, such as films, tubes, plates, ribbons, etc. It can also be used for granulation. www.weiyuanshebei.com
The plastic extruder is designed with advanced technology, high quality, good plasticization, low energy consumption, and adopts involute gear transmission. It has the characteristics of low noise, smooth operation, large bearing capacity, and long service life.
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