According to the number of screw roots, it can be divided into single screw, twin screw, three screw and multi screw. The twin-screw can be divided into parallel twin screw and conical twin screw. The twin-screw can be divided into the same direction and the hetero direction according to the rotation direction.
According to the meshing mode, it can be divided into full meshing, non meshing and partial meshing. The full meshing can be divided into conjugate and non conjugate.
According to the structure characteristics of the screw slot, it can be divided into the equal depth screw and the non - equal depth screw.
According to the characteristics of the screw, it can be divided into common screw and wave screw.
According to the number of screws can be divided into single head screw double head screw three screw (can be used in use).
In accordance with the structure of the cylinder, the exhaust is not exhaust.
According to the feeding way, it can be divided into one feeding and multiple feeding, and can also be divided into metering feed and starving feed.
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