Vacuum coating machine Vacuum aluminizing is to heat and melt aluminum metal to transpiration in a vacuum state, and aluminum atoms condense on the surface of polymer materials to form a very thin aluminum layer. Vacuum aluminizing requires the surface of the substrate to be lubricated, flat, and uniform in thickness; the stiffness and friction coefficient are appropriate; the surface tension is greater than 38Dyn/Cm2; below 0.1%. Commonly used aluminized substrates are polyester (PET), polypropylene (PP), polyamide (PA), polyethylene (PE), polyvinyl chloride (PVC) and other films. *Vacuum coating equipment* What are the common problems of aluminum coating technology?

1. There are holes in the film when aluminized

  reason:

①The aluminum material in the transpiration boat is too full. Solution: reduce the speed of aluminum feeding; increase the current of the transpiration boat.

②There is a short circuit between the evaporation boats in the vacuum chamber. Solution: Clear the short circuit.

③Splash of impurities in the vacuum chamber

2. The film is stretched when aluminized

  reason:

①The tension of the substrate is too high. Solution: Adjust the tension control system of unwinding and coiling to properly reduce the tension.

②The cooling system works abnormally. Solution: Check the cooling system and remove the fault.

3. Brown streaks appear on the surface of the film

  reason:

①Low degree of vacuum Solution: Clean the aluminum feeding, evaporation equipment, cooling system, unwinding, coiling equipment and guide rollers in the vacuum chamber; check the vacuum system; reduce the ambient humidity.

②The film releases gas. Solution: pre-dry the film; extend the vacuum time.

③ Too much aluminum spray. Solution: increase the speed of the vehicle; decrease the current of the evaporation boat; decrease the speed of aluminum feeding.

④There are impurities in the transpiration boat. Solution: Clean the evaporation boat and heat shielding plate.

⑤ The transpiration boat is aging. Solution: Replace the transpiration boat.

Process requirements: The degree of vacuum should not be lower than 103PA, to avoid brown stripes or uneven thickness of the aluminum layer; control the tension of the system, open the cooling system, and prevent the film from being stretched and deformed by heat; accurately control the winding speed (280 ~ 320m/min) ), the speed of aluminum feeding (0.4~0.7m/min? 2mm aluminum wire) and the heating current of the evaporation boat to obtain the thickness of the aluminum layer required by the product (100~300A°); a certain dry amount of primer can be coated on the film in advance Glue, and fully dry, and then vacuum aluminum plating can improve the bonding force between the aluminum layer and the film. Then a certain amount of protective resin is coated on the aluminum film to prevent the aluminum layer from oxidatively deteriorating. The aluminized film formed by this technology is resistant to friction and is not easy to change.

Ningbo Honyu Vacuum Technology Co., Ltd. is professional China automotive car light vacuum coating machine manufacturers, located in Ningbo, a port city in Hangzhou Bay Economic Belt, China. After 30 years of technical precipitation, the company has hired senior design consultants, experts and senior engineers, and a professional military technology team. The main products are: wholesale automotive car light vacuum coating machine, bathroom hardware decoration coating equipment, optical coating equipment, glass ceramic special coating equipment, DLC tool coating equipment, etc. As one of the leading automotive car light vacuum coating machine factory, our company implements the one-stop service model at domestic and overseas, formulates the design scheme according to the needs of customers, as well as the process flow of equipment commissioning operation and quality control in production and operation. With high-quality after-sales service and lifelong technical guidance, we escort customers' production and development and avoid worries.