Production process flow of PVC pipe


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”.


SG-5 PVC resin is used for the forming of PVC pipe, and stabilizer, lubricant, filler, pigment, etc. are added. These raw materials are kneaded according to the formula after appropriate treatment. If single screw extruder is used for pipe extrusion, the kneaded powder should also be made into particles and then extruded for forming; If the twin-screw extruder is used, it can be directly formed with powder. The process flow of PVC pipe is as follows:

In addition, in production, it can be different from the process shown above, that is, the powder is directly extruded from the pipe without granulation, but two points should be paid attention to:

First, it is better to use twin-screw extruder for direct extrusion of powder. Because there is less one mixing shear plasticization process compared with granular material, the use of twin-screw extruder can strengthen shear plasticization and achieve the expected effect;

Second, because the granular material is denser than the powder material, and the heat and heat conduction are poor, the processing temperature of the powder material can be about 10 lower than that of the corresponding granular material.


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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