How to avoid common extrusion problems in film extrusion, such as thermal decomposition, bubbles and surface defects

In the Screw Barrel For Extrusion Of Film Blowing film extrusion process, problems such as thermal decomposition, bubbles and surface defects are often common challenges in the production process. By appropriately adjusting parameters such as temperature, pressure and speed of the extruder, the heating, melting and exhausting processes of plastic materials can be effectively controlled. This means that various parameters need to be carefully adjusted during the extrusion process to ensure that the plastic material is in the best processing condition and to avoid thermal decomposition. At the same time, special attention needs to be paid to the control of the extrusion temperature to ensure it is within an appropriate range to prevent the decomposition of plastic materials caused by overheating.

Choosing the right plastic material is also crucial. In film extrusion production, it is essential to select high-quality plastic raw materials that meet the requirements of the extrusion process. In addition, it is necessary to ensure that the raw materials are of good quality and maintained at an appropriate degree of dryness to avoid moisture or impurities in the raw materials, thereby reducing the risk of thermal decomposition.

In addition, the design of the screw and barrel also has an important impact on the quality of film extrusion. By adopting a reasonable screw structure and geometry, the plasticizing and mixing effects of plastic materials can be improved, the residence time of the material during the extrusion process can be reduced, and the risk of thermal decomposition can be reduced. Therefore, in the design of extrusion equipment, special attention needs to be paid to the design of the screw and barrel and ensuring that they meet the requirements of the extrusion process.

Optimal design of die heads and molds is also key to avoiding extrusion problems. The use of optimized die heads and molds can ensure smooth extrusion channels, prevent the generation of bubbles, and ensure uniform film thickness. In addition, controlling the extrusion speed and tension, as well as adding an exhaust device, can also help effectively discharge the gas generated during the extrusion process, further reducing the risk of bubbles and thermal decomposition.

Regular cleaning and maintenance of extrusion equipment are also important measures to ensure production quality. Regular cleaning and maintenance of equipment can effectively reduce the interference of impurities and residues on the extrusion process, ensure the normal operation of the equipment, and further prevent the occurrence of extrusion problems.