Design of screw barrel of PE-RT pipe extruder


Ningbo Fangli Technology Co., Ltd. is a mechanical equipment manufacturer with nearly 30 years’ experiences of plastic pipe extrusion equipment, new environmental protection and new materials equipment. Since its establishment Fangli has been developed based on user’s demands. Through continuous improvement, independent R&D on the core technology and digestion & absorption of advanced technology and other means, we have developed PVC pipe extrusion line, PP-R pipe extrusion line, PE water supply / gas pipe extrusion line, which was recommended by the Chinese Ministry of Construction to replace imported products. We have gained the title of “First-class Brand in Zhejiang Province”.


According to the raw material characteristics of PE-RT pipe, the length diameter ratio of the screw is relatively large, which is usually designed as 33:1. The double-stage mixing screw is adopted in the screw structure, and there is a mixing element in the middle and head of the screw to avoid excessive shearing of the material. The barrel of the feeding section adopts an independent bushing structure, the cooling medium is cooled, and the inner surface is axially slotted. These structural designs help to improve the conveying efficiency of the feeding section. The screw barrel is made of high-quality alloy and the surface is specially treated. The barrel screw shall ensure high accuracy. If the accuracy is poor, according to the time-temperature equivalence principle, if there is residue adhesion in unsmooth places, the temperature will be greatly increased after a long time, degradation or decomposition products will appear after a long continuous production time, and there will be intermittent small black spots on the pipe surface, affecting the product quality.


If you need more information, Ningbo Fangli Technology Co., Ltd. welcomes you to contact for a detailed inquiry, we will provide you with professional technical guidance or equipment procurement suggestions.

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