Important parameters of barrel screw
Por Cathy Lin
September 26th, 2024
vistas 8
The important parameters of barrel screw include screw diameter, screw length-diameter ratio, compression ratio, pitch, width of screw groove, depth of screw groove, screw Angle, clearance between screw and barrel, etc. These parameters have great influence on extrusion process and properties.
screw diameter : the screw diameter is the outer diameter of the thread, and the production capacity of the extruder is proportional to the square of the screw diameter. Screw diameter is usually measured in millimeters (mm).
screw length-diameter ratio : The ratio of the length of the working part of the screw to the diameter of the screw is called the length-diameter ratio. Increasing the length-diameter ratio can increase the length of the screw, which is conducive to the mixing and plasticizing of plastics, but it will also increase the power consumed by the screw and the difficulty of processing.
compression ratio : The compression ratio is the ratio of the volume of the first screw groove in the feeding section of the screw to the volume of the last screw groove in the homogenizing section, indicating the degree to which the plastic is compressed during the whole process of the screw. The larger compression ratio can make the granular plastic fully plasticized.
helix Angle : helix Angle is the Angle between the screw thread and the cross section of the screw, the size of the helix Angle affects the extrusion amount and plasticizing quality.
The gap between the screw and the barrel : this gap affects the production capacity of the extruder and the plasticization of the material. Large clearance, low production efficiency, not conducive to heat conduction; The gap is small, the shear effect is too large, and the material is degraded.
The selection and adjustment of these parameters need to be carried out according to the specific processing needs and material properties to ensure the best processing results and product quality.
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Clearance between screw and barrel
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