Screw elements' pitch
Jessica Zhang
Twin Screw Extruder Parts Business Development Specialist?Tailor-made solutions for extruders?screw element/barrel/shaft/side feeder/vacuum vent stuffer
Pitch?affects the filling degree, residence time and pressure building capacity of the material in the spiral groove.
Large pitches are used in the exhaust area and feed area to create low filling to facilitate the addition of exhaust and material addition.The small pitch screw element is used to press the material and form a 100% filling degree.
When the pitch?is about 2.5 times the screw diameter, with the increase of the pitch, the material residence time will be reduced, the residence time distribution will be narrowed, and the filling degree will be reduced.But it will increases towing capacity and sensitivity to pressure flow.The decisive factors in selecting the best pitches are the volume flow rate (extrusion amount) and the sensitivity of the material to shear and temperature when it is processed.
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