Extrusion molding is a commonly used method for processing engineering plastics, which has the advantages of simple process, high production efficiency, and low cost. By reasonably controlling parameters such as temperature, pressure, and extrusion speed during the extrusion process, plastic products that meet the requirements can be obtained. With the continuous innovation and progress of technology, extrusion molding will be applied in more fields and provide more possibilities for the manufacturing of plastic products.
Extrusion molding has the advantages of high production efficiency and stable product quality. During the production process, the extruder can continuously produce dozens or even hundreds of products per minute, with high production efficiency. Meanwhile, due to the cooling and hardening of plastic during the extrusion process, the size and shape of the formed products are relatively stable, with a certain degree of accuracy and precision.
How to solve the quality problems during the extrusion molding process in Dalian?
Temperature control: During the extrusion process, temperature control is very important. If the temperature is too high or too low, it will affect the melting and flowability of the raw material, thereby affecting the molding quality. Therefore, it is necessary to adjust the temperature of the heater and cooler reasonably to ensure that the temperature is within the appropriate range.
Pressure control: During the extrusion process, moderate extrusion pressure is required to ensure that the raw materials can fully melt and flow evenly. Excessive extrusion pressure can lead to excessive product size, while too low extrusion pressure can lead to unstable production. Therefore, it is necessary to adjust the extrusion pressure appropriately based on the characteristics of the raw materials and product requirements.
Extrusion speed control: The control of extrusion speed has a significant impact on the size and surface quality of the product. Excessive extrusion speed can lead to rough product surfaces, while excessively low extrusion speed can lead to inaccurate product dimensions. Therefore, it is necessary to control the extrusion speed within an appropriate range by adjusting the screw speed and feed rate of the extruder.
The process of extrusion molding mainly includes three stages: raw material pretreatment, plasticizing extrusion, and cooling molding. Feed plastic raw materials into the feed port of the extruder in the form of granules or powders. In the feeding section, the plastic raw material is gradually pushed forward through the rotation of the screw, and the heating and friction effects of the screw are utilized to gradually melt and plasticize the plastic raw material. In the plasticizing section, the heated screw heats the plastic raw material above the melting point, forming a uniform melt. Under the action of the extrusion mold set at the extrusion outlet, the molten plastic material column is extruded into shape, and after cooling, the required plastic products are formed.
The molten plastic is pushed towards the mold by the screws inside the extruder. The screw of the extruder is driven by a motor, rotating at a certain speed, and pushing the plastic melt along the spiral line of the screw. During the pushing process, the screw brings the heated plastic melt from the hopper to the mold, and through the stirring effect of the screw, the plastic melt reaches a uniform temperature and composition distribution.
