Common Problems and Preventive Measures in the heat Sealing process of canopy fabric

1. Welding Sparking

Cause: Excessive high-frequency current or an unlevel mold leading to an unstable arc.

Solution: Calibrate the mold's level and adjust the current to a reasonable range (e.g., 150-180℃ for ETFE membrane materials).

Use short arc welding to avoid excessive arc length causing sparking.

2. Weld Air Bubbles

Cause: Moisture in the membrane material or uneven heat sealing temperature.

Solution: Ensure the membrane material is dry and clean the surface before heat sealing.

Control the temperature uniformly to avoid localized overheating.

3. Insufficient Weld Strength

Cause: Insufficient heat sealing pressure or too short a time.

Solution: Increase the pressure and extend the heat sealing time.

4. Poor Sealing

Cause: Incomplete weld fusion or the presence of impurities.

Solution: Thoroughly clean the membrane surface, ensuring it is free of oil and moisture.

5. Membrane Deformation

Cause: Uneven heat sealing temperature or insufficient cooling.

Solution: Uniform heating.

Key Operation: The parameters of the high-frequency heat sealing machine need to pass process evaluation.