The twin screws of the extruder can be divided into three sections functionally.
2024-10-29
The way the twin-screw extruder is used is to force feed according to the gap between the two screws of the twin-screw extruder. The difference between it and the single-screw extruder is the friction drag between them for solid transportation. related. The extrusion process of a twin-screw extruder is simply a process in which two screws rotate in the barrel and push the plastic forward. The advantages of twin-screw extrusion are as follows:
1. Can clearly understand the wear and tear situation
Because it is easy to open, the wear degree of the threaded components and the inner bushing of the barrel can be found at any time, so that effective repair or replacement can be carried out. This prevents unnecessary waste from being discovered only when problems occur with the extruded product.
2. Can reduce production costs
When manufacturing masterbatch, it is often necessary to change the color. If it is necessary to change the product, open the open processing area within a few minutes. In addition, the mixing process can be analyzed by observing the melt profile on the entire screw. At present, when changing the color of ordinary twin-screw extruders, a large amount of cleaning materials are needed to clean the machine, which is time-consuming, energy-consuming, and wastes raw materials. The split twin-screw extruder can solve this problem. When changing colors, it only takes a few minutes to quickly open the barrel and perform manual cleaning. This way, no or less cleaning materials can be used, saving costs.
3. Can improve labor efficiency
When manufacturing masterbatch, it is often necessary to change the color. If it is necessary to change the product, open the open processing area within a few minutes. In addition, the mixing process can be analyzed by observing the melt profile on the entire screw. At present, when changing the color of ordinary twin-screw extruders, a large amount of cleaning materials are needed to clean the machine, which is time-consuming, energy-consuming, and wastes raw materials. The split twin-screw extruder can solve this problem. When changing colors, it only takes a few minutes to quickly open the barrel and perform manual cleaning. This way, no or less cleaning materials can be used, saving costs.
4. Wide range of applications
Suitable for processing different types of materials
5. High output, high quality and efficiency
It combines the advantages of ordinary twin-screw extruders to achieve high output, high quality and efficiency.
The twin-screw extruder is functionally divided into 3 sections
Functionally, the extruder screw can be divided into three sections: feeding section, compression section and homogenization section.
sub-thread pitch LI, LZ, h - thread depth h in the feeding section, thread depth h in the homogenizing section, port - outer diameter L - effective length of the screw in the feeding section, compression section and homogenizing section.
Feeding section: Its function is to quickly transport the plastic slices added from the hopper. The volume of the screw channel in this section generally remains unchanged and the plastic is in a solid state. Usually the screw channel is not completely filled with materials. The degree of filling is related to the shape of the materials, the degree of dryness and wetness, and the feeding device.
Compression section (plasticizing section): its main function is to compact and plasticize the loose material transported from the feeding section and to discharge the entrained air. The volume of the screw groove in this section gradually becomes smaller or suddenly becomes smaller, and the plastic gradually changes from a solid state to a molten state in this section, becoming a continuous drilling fluid and transported to the homogenization section.
Homogenization section (measurement section): its main function is to further plasticize the molten material sent from the compression section evenly, and to evenly extrude the pipe material from the machine head at a constant and constant pressure.
(3) Auxiliary machine part The part after the machine head is called auxiliary machine. The auxiliary machine part generally includes: machine head, cooling and shaping device, traction device, cutting device and coiling device.