In the extrusion molding process, the extruder screw is […]
In the extrusion molding process, the extruder screw is one of the key components, and the selection of its design parameters directly affects the quality of the product, production efficiency, and equipment stability. This article will delve into the impact of the design parameters of a common ordinary hot feed extruder screw on product quality in order to better understand and control the key factors in the extrusion molding process.
Screw diameter is an important parameter in the design of the extruder screw. The larger the diameter, the larger the screw volume, and the greater the amount of material that can be fed per revolution, so the extrusion volume It also increased accordingly. However, if the screw diameter is too large, it may cause excessive extrusion pressure and affect the surface smoothness and dimensional accuracy of the product.
The aspect ratio of the screw refers to the ratio of the length to the diameter of the screw, which affects the effect of the extruder in the plasticizing process. The larger the aspect ratio, the more obvious the compression effect of the screw. The pressure and shear force on the plastic particles in the screw increases, which is beneficial to the uniform plasticization and mixing of the plastic.
The pitch refers to the distance between two adjacent spiral grooves, which determines the speed of plastic particles moving on the screw. A larger pitch will cause the plastic particles to move faster within the screw, but may affect the uniformity of plasticization. Therefore, the reasonable selection of the pitch needs to be considered in the design to ensure sufficient plasticization and mixing of the plastic.
The groove depth refers to the depth of the spiral groove, which is closely related to the extrusion pressure. A deeper screw groove can accommodate more plastic particles, increase the pressure on the plastic within the screw, and thereby increase the extrusion pressure. However, if it is too deep, it may increase energy consumption and the manufacturing cost of the screw.
The shape of the spiral groove also has an important influence on the mixing effect of plastics. For example, the double-screw design can improve the mixing uniformity of plastics, but it will also increase manufacturing costs and production difficulty. Therefore, the appropriate spiral groove shape needs to be considered in the design based on specific production requirements and costs.
The design parameters of the ordinary hot feed extruder screw directly affect the quality of the product, production efficiency and equipment stability. In practical applications, it is necessary to comprehensively consider the interaction between various parameters and select an appropriate design solution to achieve the best production results and economic benefits.
