Uchafuzi wa kupungua huonyeshwa hasa kwenye uso wa karatasi ya alumini ndani 0 jimbo. Baada ya foil ya alumini ni annealed, inajaribiwa kwa njia ya kusafisha maji, na haifikii kiwango kilichobainishwa katika mtihani wa kuswaki maji.
Foil ya alumini ambayo inahitaji mtihani wa kuosha maji hutumiwa hasa kwa uchapishaji, mchanganyiko na vifaa vingine, nk. Kwa hiyo, 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.
