EN 
简体中文Twin screw extruders are used in two main areas. One is to process polymers that are difficult to process because they do not flow easily and degrade easily. The other is for special machining operations. In the case of profile extrusion, use counter-rotating close-mesh extrusion.
Because their forward conveying properties enable the machines to handle difficult-to-feed materials and produce short dwell times and narrow dwell time distributions. In the case of special operations, high-speed meshing co-rotating extruders are usually used, but various other designs are also used.
One of the main differences between twin screws and single-screw extruders is the type of transport that takes place in the extruder. Material transport in a single screw extruder is caused by the resistance of solid particles and molten material.
On the other hand, conveyance in intermeshing twin screw extruders is somewhat positive displacement. The degree of positive displacement depends on how well the flight of one screw closes the opposite passage of the other screw. Closely intermeshing counter-rotating twin-screw extruders provide maximum positive displacement.
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