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”.
1、In the process of extrusion, the material is transformed from glassy state to molten state. In addition to balancing the heat required for material plasticization and the heat supply, so that the material can complete the ideal plasticization, melt pressing is also a very important control index. Because the material is affected by the die resistance and the compression ratio of each screw section in the extrusion process, it does not exist at atmospheric pressure. For different dies, the compression ratio of each screw section is basically constant and immutable.
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 the compression section increases or decreases with the change of the compression ratio; The feeding speed increases or decreases synchronously with the extrusion speed. As 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.
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