Acoustic oscillation marks produced by the sizing die in extrusion foaming

High-frequency fine streaks appear on the surface of extruded foam. This problem is relatively common in foam molding production and requires comprehensive analysis and solution from multiple aspects of material, process, and equipment.

(1) Process factor: Airflow or cooling water flow in the sizing die generates acoustic oscillations that feed back to the foam surface, This factor affects the '2079851475616104453 and final quality of the product. (2) Material aspect: Fluctuations in raw material performance indicators or insufficient pretreatment affect molding quality. (3) Process aspect: Control deviation of key process parameters causes the '2079851475616104453 to deviate from optimal conditions. (4) Equipment aspect: Equipment precision and maintenance status affect the stable execution of process parameters.

(1) Design optimization: Optimize the airflow guidance design of the sizing die, Combine process simulation analysis or mold trial verification to continuously iterate and improve the design solution. (2) Implementation measure: Adjust the cooling water flow rate to eliminate oscillation, Develop a specific operation plan based on actual production conditions, and verify the implementation effect. (3) Formulation optimization: Add a buffer section in the sizing die., Determine the optimal addition amount through small-batch tests, and verify the effect on the overall performance of the product. (4) Preventive measure: Establish sound process control standards and a quality inspection system, and regularly review process data for continuous optimization.

This problem requires comprehensive analysis from multiple dimensions of material, process, equipment, and operation, and should be solved by systematically optimizing process parameters and the quality control system.