Many problems might rise in the
aluminium foil production process, among which are thickness difference, water marks and oil remains. Here we deal with the three.
The thickness difference of
aluminum foil rolls is often encountered in the rolling process of aluminum foil production. 3% thickness difference may be easy to achieve in aluminum plate manufacturing, but it is very difficult in aluminum foil production. The only way to adjust the thickness is the tension speed. Therefore, it is very difficult to control the thickness difference of aluminum foil within 3%, and the requirements for equipment and environment are very strict.
A water mark refers to the water drop on the
aluminium foil food before rolling. After rolling, some white spots will be formed. If the water mark is slight, it will affect the appearance and brightness of the aluminum foil surface. It is necessary to control the water content in the oil and keep the rolling mill clean and sanitary to avoid the water mark of food aluminum foil.
Oil remains are often encountered in the rolling step of aluminum foil production process, which means that there are some extra oil in the aluminum foil food after rolling, that is, oil other than rolling oil film. This kind of oil is complex and dirty. It is usually dripped on the surface of the aluminum sheet by the oil at the roll neck or at the outlet of the rolling mill. Oil pollution has a great impact on the quality of
aluminum foil. Some aluminum is used as packaging or decoration materials, and the surface must be smooth and bright. Oil pollution will also affect the thickness of the finished aluminum foil roll. In the annealing process, it is easy to form bubble like bulge, and the oil pollution is relatively dirty, which will form a lot of residues and affect the use of aluminum foil. Oil pollution is a very important index to evaluate the quality of aluminum foil.