pvd coating machine aluminum plating is to heat and melt aluminum metal to evaporate in a vacuum state, and aluminum atoms condense on the surface of polymer materials to form a very thin aluminum layer. Vacuum aluminizing requires that the surface of the substrate is smooth, 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, the process requirements; the vacuum degree shall not be lower than 103PA, To avoid brown streaks or uneven thickness of the aluminum layer; control the tension of the system, turn on the cooling system, and avoid stretching and deformation of the film when heated; accurately control the coiling speed (280 ~ 320m/min), and the aluminum feeding speed (0.4 ~ 0. 7m/min? 2mm aluminum wire) and evaporation boat heating current to obtain the required aluminum layer thickness (100-300A°); a certain dry amount of primer can be pre-coated on the film, fully dried, and then vacuumed 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 oxidation and deterioration of the aluminum layer. The aluminized film formed by this process is resistant to friction and is not easy to deteriorate.

  Common quality problems and solutions of vacuum aluminum plating are as follows:
       1. Brown streaks appear on the surface of the film
       reason:
       ①Low degree of vacuum Solution: Clean the aluminum feeding, evaporation device, cooling system, unwinding, coiling device and guide roller in the vacuum chamber; check the vacuum pumping system; reduce the ambient humidity.
       ②The film releases gas. Solution: pre-dry the film; prolong the vacuuming time.
       ③ Too much aluminum spray. Solution: increase the speed; reduce the current of the evaporation boat; reduce the speed of aluminum feeding.
       ④There are impurities in the evaporation boat. Solution: Clean the evaporation boat and heat shield.
       ⑤ The evaporation boat is aging. Solution: replace the evaporation boat.
       2. There are holes in the film when aluminized
       reason:
       ①The aluminum material in the evaporation boat is too full. Solution: reduce the speed of aluminum feeding; increase the current of the evaporation boat.
       ② There is a short circuit between the evaporation boats in the vacuum chamber. Solution: Eliminate short circuits.
       ③Splash of impurities in the vacuum chamber
       Solution: Clean the inner wall of the vacuum chamber, the aluminum feeding evaporation device, the cooling drum, the unwinding, the coiling device and the guide rollers.
       3. When the pvd coating machine is aluminized, the film is stretched
       reason:
       ①The tension of the substrate is too high. Solution: Adjust the tension control system of unwinding and coiling, and reduce the tension appropriately.
       ②The cooling system is not working properly. Solution: Check the cooling system and troubleshoot.