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Extruder Screw Design and Repair Process
The extrusion system consists of screw and barrel, which is the "heart" of extrusion work. The screw completes the continuous conveying, plasticizing, homogenizing, constant pressure and quantitative extrusion of plastics in the barrel. The types of screws are: constant pitch gradual change screw, constant pitch depth abrupt change screw, variable depth variable pitch screw, etc. The structure of constant pitch progressive screw is studied as an example. Its main features: the thread pitch of the screw thread is equal, while the depth of the thread groove remains unchanged in the feeding section and homogenizing section, while the depth of the thread groove in the plasticizing section gradually becomes shallow from the depth, which is suitable for extrusion plasticization of various plastics. The progressive screw divides the working length of the screw into three basic functional segments,
The extrusion system consists of screw and barrel, which is the "heart" of extrusion work. The screw completes the continuous conveying, plasticizing, homogenizing, constant pressure and quantitative extrusion of plastics in the barrel. The types of screws are: constant pitch gradual change screw, constant pitch depth abrupt change screw, variable depth variable pitch screw, etc. The structure of constant pitch progressive screw is studied as an example. Its main features: the thread pitch of the screw thread is equal, while the depth of the thread groove remains unchanged in the feeding section and homogenizing section, while the depth of the thread groove in the plasticizing section gradually becomes shallow from the depth, which is suitable for extrusion plasticization of various plastics. The progressive screw divides the working length of the screw into three basic functional segments,
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Sharing the Economic Factors of Extruder Screw Design
For any technical problem, it is totally wrong to ignore the economy of design. In some cases, the rationality of screw design must be analyzed more comprehensively, that is, from the perspective of economy.
Functional characteristics of exhaust screw
In the extrusion process, the gas to be discharged from the raw material includes three parts: the air brought in between the raw material particles; Moisture adsorbed on granular materials; Gases or liquids contained in raw materials, such as residual monomers, low molecular volatiles and water, etc.
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