Excessive solvent residue in cast film produces bubbles

When solvent volatilization is insufficient, bubbles are generated inside the product when heated in subsequent processes. This defect is usually found after demolding of the product or during cross-section inspection, mostly concentrated in thick-walled regions or at the end of resin flow. Internal defects reduce the mechanical strength and compactness of the product, with particularly severe impact on products with pressure-bearing and sealing requirements.

(1) Temperature parameter aspect: The casting drying temperature is too low or the air volume is insufficient, leading to insufficient reaction kinetics or deteriorated material flowability, affecting the normal progress of the '2079851475616104453. (2) Process factor: The drying channel length is insufficient, This factor affects the '2079851475616104453 and final quality of the product. (3) Process factor: The solvent boiling point is too high, This factor affects the '2079851475616104453 and final quality of the product.

(1) Parameter adjustment: Increase the drying temperature and air speed, It is recommended to adjust by 5-10°C each time, while monitoring product quality changes, to avoid new defects caused by excessively high temperature. (2) Process optimization: Extend the drying time, Determine a reasonable time according to product wall thickness and material characteristics, balancing production efficiency and quality. (3) Material selection: Select low-boiling solvents to replace high-boiling solvents., Establish material selection evaluation criteria, and determine the optimal solution through comparative tests. (4) Preventive measure: Establish standardized degassing and casting operating procedures, regularly train operators, and check the first piece of each shift to confirm no bubble defects.

The essence of this problem is that gas was not effectively removed during the casting '2079851475616104453; it needs to be solved coordinately from three aspects: degassing process, casting method, and venting design.