Vacuum coating-common problems of aluminum coating process of vacuum coating equipment
1. There are holes in the film during aluminum plating
Reason:
①The aluminum material in the evaporation boat is too full. Solution: Decrease the aluminum delivery speed; advance the evaporation boat current.
② There is a short circuit between the evaporation boats in the vacuum chamber. Solution: clean the short circuit.
③Impurities splash in the vacuum chamber
2. The film is stretched during aluminum plating
Reason:
①The tension of the substrate is too high. Solution: Adjust the tension control system for unwinding and rewinding to properly reduce the tension.
② Abnormal operation of the cooling system. Solution: Check the cooling system and clean up the fault.
3. There are brown stripes on the surface of the film
Reason:
① Low vacuum. Solution: Clean the aluminum delivery, evaporation equipment, cooling system, unwinding, coiling equipment and guide rollers in the vacuum chamber; check the vacuum system; reduce the environmental humidity.
②The film releases gas. Solution: The film is pre-monotonous; stretch the vacuum moment.
③ Excessive aluminum spraying. Solution: forward vehicle speed; decrease evaporation boat current; decrease aluminum delivery speed.
④ There are impurities in the evaporation boat. Solution: Clean the evaporation boat and heat shielding plate.
⑤The evaporation boat is aging. Solution: Replace the evaporation boat.