Extruder

Abstract

The present invention discloses one kind of extruder capable of pelletizing wet material directly. The extruder consists of one frame, one spiral cylinder and one drive set; and has one heater set on the spiral cylinder, and one screw set inside the spiral cylinder and connected to the output shaft of the drive set. Both the spiral cylinder and the screw are provided with corresponding conveying section, plasticizing section and melting section; the spiral cylinder has material inlet set in the conveying section with fitting material bin and exhaust holes in the plasticizing section and the melting section; the screw is provided with mixing head in the plasticizing section and the melting section; and the conveying section of both the spiral cylinder and the screw is provided with one compressing and water squeezing structure. The present invention is applied mainly in pelletizing recovered waste plastic.

Description

technical field [0001] The invention relates to an extruder used for recycling and granulating waste plastics. Background technique [0002] At present, the structure of an extruder used to recycle and granulate waste plastics usually includes: a frame, a screw barrel is arranged on the frame, and a power device composed of a motor and a reducer, and a heater is arranged on the screw barrel. There is a screw in the screw barrel, one end of the screw is connected with the output shaft of the reducer, and the input shaft of the reducer is connected with the output shaft of the motor; the screw barrel and the screw are equipped with corresponding conveying section, plasticizing section and melting section. Section, the conveying section of the screw barrel is provided with a feed inlet and a feeding hopper matched with the feed inlet, and vent holes are respectively arranged on the plasticizing section and the melting section of the screw barrel, and the plasticizing section an...

AI Technical Summary

Problems solved by technology

The extruder with the above-mentioned structure has very high requirements on the material, and usually requires its water content not to exceed 5%, but the recycled waste plastics usually cannot meet this standard after cleaning, and the recycled waste plastics after cleaning must be cleaned. The plastic is dried or heated and evaporated until its water content drops to 5%. Drying makes the cycle of waste plastics from recycling to extruder processing into granules longer, and heating increases the cost of processing granulation too much, which is uneconomical; Moreover, once waste plastics with high water content enter the extruder, the light ones will affect the output and quality of the granulation, and the severe ones will cause the extruder to fail to work normally.

In addition, the feeding openings of the screw barrels in the above-mentioned extruders are all relatively narrow, and their length is usually less than the sum of the two pitches of the screw rods, and the width is equivalent to the diameter of the screw barrels, so that the output of the extruder is relatively low.

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