How should an extruder be selected when extruding sheet (plate) materials?

How should an extruder be selected when extruding sheet (plate) materials?

Extruders used for extruding plates and sheets can be single-screw or twin-screw extruders. Common single-screw extruders are mainly used for the molding of thermoplastics such as HDPE, LDPE, and PP, while vented single-screw extruders are mainly used for the molding of plastics such as PS, PMMA, and PC. When using a single-screw extruder, the diameter of the screw is generally between 65 and 200 mm, the length-to-diameter ratio of the screw is greater than 20, and a filter screen should be installed at the head of the screw.
The twin-screw extruder is mainly used for the direct extrusion molding of PVC powder. Generally, parallel twin-screw or conical twin-screw extruders can be adopted. When a parallel twin-screw extruder is selected, the screw diameter is usually 80 to 140 mm, and the length-to-diameter ratio is less than 21. For a conical twin-screw extruder, the diameter of the small end of the screw is 35 to 80 mm.
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