Degreasing pollution is mainly manifested on the surface of the aluminum foil in 0 state. After the aluminum foil is annealed, it is tested by the water brushing method, and it does not reach the level specified in the water brushing test.
The aluminum foil that requires the water-washing test is mainly used for printing, composite with other materials, etc. Therefore, the surface of the aluminum foil must be degreasing clean and reach the level specified by the water-washing test.
The main reasons for unclean degreasing: excessive oil on the surface of the aluminum box; excessive slitting tension; unreasonable annealing process.