Overview of Pipe Extrusion Die


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”.


Here we have prepared overview of pipe extrusion die, as follows:

Pipe extrusion die is an indispensable and key component in the complete set of pipe extrusion equipment (production line). It is the main key equipment for shaping and ensuring product quality.


Main functions of pipe extrusion die

· Make the molten material change from spiral motion to linear motion;

· Generate necessary forming pressure to ensure the compactness of products;

· The material is further plasticized through the mold;

· Ensure the surface quality of products;

· The products with the required section shape and size can be obtained through the die.


Basic requirements for pipe extrusion die

·The flow passage of molten plastic shall be smooth and streamlined without dead corner;

·The runner surface shall be subject to wear-resistant or corrosion-resistant treatment, such as nitriding or hard chromium plating;·In order to make the product dense, it is necessary to ensure sufficient pressure, that is, the compression ratio design of the die head should be reasonable. Generally, the pressure of polyolefin mold is in the range of 10-30mpa;

·The material flow shall be at a lower material temperature in the mold to prevent the material from transverse flow and premature oxidation effect;

·On the premise of meeting the strength requirements, the connection with the barrel and co-extrusion machine has good sealing and easy loading and unloading;

·There is no material leakage at the joints of the die.