High-speed PB tube single screw

Abstract

The invention provides a high-speed PB tube single screw, which comprises a feeding section, a separation-type melting section and a mixing-type extruding section, wherein the separation-type melting section is provided with a main screw edge and two auxiliary screw edges, the depth of a screw channel of the feeding section is 7mm to 8mm, the lead of the main screw edge is 105 to 110 mm, and the lead of the auxiliary screw edges is respectively 107 mm and 84 mm. The high-speed PB tube single screw solves the phenomenon of the prior PB tube screw that the productivity is difficult to be improved at the high speed, the plasticized quality is poor and the temperature of the fuse is too high, and can obtain the PB melting plastics with good plasticized quality and high productivity (300kg / hour).

Description

technical field [0001] The invention belongs to the field of extrusion screw manufacture of plastic pipe production equipment, in particular to a high-speed PB pipe single screw. Background technique [0002] At present, the general trend of single-screw design of plastic extruders is to increase productivity by increasing the screw speed and appropriately deepening the depth of the screw groove, by using various mixing sections, by changing the structure of the screw or increasing the length-to-diameter ratio of the screw, etc. To ensure uniform plasticization and stable extrusion quality at an appropriate extrusion temperature while increasing productivity. This type of screw adopts various mixing sections or mixing elements on the screw or changes the screw structure to be different from the ordinary three-stage screw. [0003] For example, the utility model patent with the Chinese patent application number 01201356 discloses a mixing type single-screw extruder for high-...

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned existing technologies are all screw equipment with relatively advanced technology. However, with the high speed of the screw, the friction between the plastic and the barrel is greatly increased, and high pressure is generated in the feeding area. Due to the influence of high pressure and high friction, feeding in the barrel The section generates a large amount of frictional heat, which may melt the plastic in the feeding section, and the resulting molten material penetrates into the solid plastic, destroying the solid conveying and reducing the conveying efficiency

Therefore, the existing PB pipe screw has the problems of difficulty in improving productivity at high speed, poor plasticization quality, and high melt temperature, which cannot meet the demand.

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