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”.
Today, we’d like to introduce the technical points of extruder as follows:
1、In the process of extrusion, the material changes from glass state to molten state. In addition to balancing the heat required for material plasticization and heat supply, so as to make the material complete the ideal plasticization, melt pressing is also a very important control index. Due to the influence of die resistance and compression ratio of each section of screw in the extrusion process, the material itself does not exist at atmospheric pressure. The compression ratio of each section of the screw is basically constant and immutable for different die.
2、On the premise of constant extrusion speed, increasing or decreasing the feeding speed will change the screw material volume in the feeding section, and the material volume in the exhaust section will remain unchanged. Therefore, the melting pressure of the feeding section and compression section will increase or decrease with the change of compression ratio; on the premise of constant feeding speed, increasing or decreasing the extrusion speed will also change the screw material volume in the feeding section. The material volume of the exhaust section remains unchanged, so the melting pressure of the feeding section and compression section increases or decreases with the change of compression ratio; The feeding speed increases or decreases synchronously with the extrusion speed. Since the material volume of the screw in the feeding section remains unchanged, the melting pressure changes only due to the increase or decrease of the speed.
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.