Twin Screw Element Optimization Enhances Food Extrusion Performance

The performance specifications of screw elements are a primary consideration in selection. In the special environment of food processing, hardness and wear resistance are key measures of quality, typically requiring a hardness standard of 58–60 HRC. The following are typical technical specifications for such components:

The component range covers diameters from 15.6 mm to 260 mm. Common materials include 6542, 1.2379, WR2, WR5 and WR14, with sand-grinding treatment applied to the surface.

When selecting screw elements, operators should confirm not only diameter and material grade but also the connection method, such as an internal spline design. Material choice should be based on the characteristics of the processed material to ensure stable geometric dimensions during long-term operation.

Material selection should account for the abrasiveness and corrosiveness of the production environment. Users are advised to clarify these conditions at the time of purchase and to match the material grade to the actual material composition and equipment requirements.

Regular inspection of screw wear is also necessary. Checking the wear state at planned intervals can help maintain stable extruder operation and reduce the risk of unexpected declines in mixing or extrusion performance.