There are several types of twin-screw extruders. What are the characteristics compared with single-screw extruders?

How many types of twin screw extruders are there?

1. According to the rotation direction of the twin screw, the extruder can be divided into two types: co-rotating and counter-rotating. Co-rotation refers to the same rotation direction of the meshing work of the two screws, and the shape and structure of the two screws, the geometry of each segment of the thread, and the thread direction are the same. The thread working engagement state of the two screws can be divided into kneading type, partial kneading type and non-kneading type. The counter-rotating twin-screw extruder means that the rotation direction of the two screws is opposite when they work, the screw direction of the two screws is opposite, one screw is left-handed, and the other screw must be right-handed.

2. According to whether the axis line of the twin screw is parallel or not during the assembly work, it is further divided into an intermeshing counter-rotating twin-screw extruder with a parallel axis line and an intermeshing counter-rotating conical twin-screw extruder with an intersecting axis machine

There are two screws in the twin-screw extruder that are engaged and rotated to work together to complete the forced transport and plasticization of the plastic. Compared with the single screw extruder, the twin screw extruder has the following characteristics.

① The frictional heat generated during the plasticization process of the raw material in the barrel is small.

② The raw materials are stably and evenly subjected to the meshing and shearing action of the twin screws in the barrel, and the raw materials are plasticized and mixed uniformly.

③ The residence time of raw materials in the barrel is short, and the output of extruded products is high.

④ The powdered raw materials can be directly used for extrusion molding products, and the plasticizing and mixing quality of the raw materials is relatively stable.

⑤ The residual material in the twin-screw meshing rotating working barrel can be automatically cleaned up.

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