Extrusion Forming Mechanism In Drip Irrigation Tape Production

After the plastic enters the barrel from the hopper, it is gradually pushed towards the machine head direction with the rotation of the screw. In the feeding section, the material is gradually compacted. When the material enters the compression section, the thread gradually becomes shallower, and due to the resistance generated by the right angle flow channel and mouth mold of the filter screen, a large pressure is formed in the material. The material is gradually compacted, and under the action of shear heat generated by heating outside the barrel and mixing shear between the internal screw and the inner wall of the barrel, the temperature of the plastic gradually increases. At about one-third of the compression section, it begins to reach the viscous flow temperature. As it is extruded towards the head of the machine, the amount of melted material gradually increases, while the amount of unmelted material gradually decreases. Around the end of the compression section, all the material melts and transforms into a viscous flow state, but the temperature at each point is still very uneven. After the homogenization process in the homogenization section, the screw squeezes the melted material into the machine head at a constant pressure, quantity, and temperature. The die inside the machine head is a molded component, and the material is formed into a certain cross-sectional geometric shape and size through the die. It is then subjected to vacuum forming, cooling, cutting, and other processes on the molding wheel to obtain a complete product.