For high-melting materials such as polystyrene (PS), polycarbonate (PC), etc., choosing a screw with a long length, a small pitch, and a strong pressure capacity is recommended. This is because these materials have a high melting point, requiring a longer screw length and smaller pitch to increase heating and compression time to melt better and discharge gas.
For difficult-to-melt materials such as glass fiber reinforced materials, it is necessary to choose a screw with good wear resistance, high-temperature resistance, and strong pressure capacity, to ensure that there will be no problems such as breakage or wear during high-speed operation.
For certain materials with special requirements, such as flame-retardant materials, heat-resistant materials, etc., it is necessary to choose a screw with a special coating or unique material, to ensure no adverse effects occur during the production process.
In addition, it is necessary to select the type and design of the screw according to the production requirements. For example, when producing large injection-molded parts, a screw that can accommodate a large amount of plastic material must be selected to ensure the entire mold is filled in one injection process. Some products that require high-speed injection and high precision need specially designed high-speed screws and high-precision screws to ensure that high-speed and high-precision production requirements are met during the injection.
In summary, the selection of injection molding machine screws needs to consider different plastic materials and production requirements and select the appropriate screw type and design based on these factors to ensure that the production requirements are met during the injection molding process and produce high-quality injection molded products.