What cross-section deformation problems will occur in plastic pipe produced by 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”.



Modern plastic pipe industry mainly uses extruders for extrusion molding production. Plastic pipes are usually round. Different uses have certain requirements for the roundness of pipes. The cross-section deformation trend of plastic pipe produced by extruder production line is to a certain extent, but if the deformation of the deformed pipe is too large, it will affect the quality of the final product, indicating that the production line fails to carry out proper and standardized rounding treatment.


Ningbo Fangli Technology Co., Ltd. as an enterprise with more than 30 years of experience in the production of plastic extruders and a full set of equipment for extruder production lines, we have prepared some information about normal pipe deformation for you, as follows:


1Elliptical deformation of pipe section

The elliptical deformation of plastic pipes indicates that the deformation amount is very large. Generally, the degree of elliptical deformation can be determined by ovality. Under normal circumstances, we will analyze the causes of this problem as the larger the bending angle, the smaller the bending radius, the larger the diameter, the thinner the pipe wall, and the greater the ovality generated during bending.


2Pipe wall deformation

The deformation of the pipe wall is very serious. The deformation of the pipe wall will cause the wall thickness of the pipe to fail to meet the production requirements of the pipe, which will not only affect the external surface quality and appearance of plastic products, but also fail to meet the actual physical pressure bearing capacity of the pipe due to the thinning of the pipe wall. If this unqualified pipe is used, it may break in the process of use or reduce the service life. Simply put, the deformation of the tube wall is that the outer tube wall is elongated and thinned. The farther away from the neutral layer, the more the tube wall is elongated, so the thinner it is; The inner tube wall is shortened and thickened. We can usually solve the problem by reducing the pipe traction speed or increasing the speed of the extruder host.


3Wrinkle and deformation of inner pipe wall of pipe

For example, when using extruder to produce PPR pipe with thin pipe wall, the inner pipe wall of the pipe will wrinkle and deform when receiving deformation pressure, because the structural strength of the pipe wall is not stable enough. Therefore, the thinner the pipe wall of the pipe we produce, the worse the structural stability of the pipe, and the easier it will be to wrinkle and deform.


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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