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The Screw Barrel of an Extruder
The Screw Barrel of an Extruder
The screw barrel of an extruder is the most important part of the machine."extruder screw barrel" It will determine the efficiency of the plasticizing process. The barrel is usually round and the same diameter as the feed hopper. The material flows into the compression zone by gravity. The length of the screw is about eight inches and the diameter of the feeding hopper is about one-half inch. The overall length of the screw is 190.5 inches. The length of the barrel is the same as the length of the screws.
The plastic screw is the central component of an extruder."extruder screw barrel" It is supported by all the other parts of the extruder. This screw plays several important functions including feeding, compacting, melting, and other functions. Here are a few examples of its main functions: – The feed hopper: The feed hopper is located near the exit of the barrel. It contains a pellet bed that collects the plastic pellets.
Screw barrel: The screw is mounted in a barrel and provides a transfer medium for heat, cooling, and venting."extruder screw barrel" The barrel is made of special bimetallic hardened liners to withstand high pressure. The inside diameter of the screw is D, and the length is L. These two values have a close relation to the residence time and surface area. The longer the screw, the better. If the diameter of the screw is too low, the material will not flow properly.
The screw barrel: The screw is located in the barrel of the extruder. The feeding tube brings plastic pellets into the extruder's feed pocket. The transition section reduces the channel volume and depth. The pellets begin to compact until there is no free space between them. At this point, the plastic pellets are pressed together forming a solid bed. The pellets are compressed to a single mass and move as one mass. Moreover, the pellets are abrasive and can be easily broken.
The screw and barrel of an extruder are the soul components. The performance of an extruder depends on their quality and efficiency. A worn-out screw and barrel can reduce the output of the plastic. Hence, the screw and barrel are crucial for the working of the machine. They affect the plasticizing ability of the material and their productivity. When the plastic is severely worn, the process will lose money per pound. Therefore, regular maintenance of the screw and barrel of the extruder is a must.
A worn-out extruder screw barrel will decrease the product quality. This will lead to poor quality and low efficiency. If the extruder is not running at its optimum capacity, the operator and QC will become frustrated and give up. In addition to the cost of the screw, a worn-out screw barrel will increase the cost of the entire operation. In fact, it is possible to replace the screw and the barrel at the same time.
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