Professional extrusion manufacturers have many factors affecting the production capacity of extruders. The production capacity and product quality of extruders are affected by material properties, processing conditions, geometric structure and size of screws, barrels and heads, as well as the processing and manufacturing accuracy of machines. Effect of head pressure. The positive flow rate has nothing to do with the pressure drop of the material flow in the homogenization section, while the reverse flow rate and leakage flow rate are directly proportional to the pressure. Therefore, the production capacity of the extruder decreases with the increase of the pressure of the head, but it is conducive to plasticization.
For extrusion molding consultation, it is necessary to set perforated plates and filter screens at the head in actual production to form a certain pressure on the materials to ensure the product quality, especially for plastics with good fluidity (such as nylon). Effect of groove depth. In the homogenization section, the positive flow is directly proportional to the first power of the screw groove depth, while the reverse flow is directly proportional to the third power.
It can be seen that too deep screw groove is harmful, which also proves that the deeper the screw groove is, the better. There is a better value. In addition, the selection of screw groove depth is also related to the head resistance. Influence of screw speed. When other conditions are certain, the production capacity of the extruder is directly proportional to the screw speed. This relationship is one of the important ways to improve the production capacity of extruder. If the capacity of each section of the extruder is sufficient and the characteristics of the main and auxiliary machines are matched, increasing the screw speed can greatly improve the production capacity of the extruder.