The use of aluminum in the tobacco packaging industry is mainly the aluminum foil for the cigarette inner packaging. The cigarette packing aluminum foil can better prevent moisture and mildew, and keep dryness and taste. The thickness of the aluminum foil is 0.006mm to 0.007mm. Generally, aluminum foil with a thickness of 0.006mm is used. The temper is soft and has good extensibility.
Aluminum foil has very good protective properties. Aluminum foil paper cigarette boxes hardly absorb any aroma substances. Other materials such as metallized (coated) paper or printed paper cannot achieve similar quality and ability to protect aroma. In addition, aluminum foil paper used as the inner lining paper of cigarette packaging has good fluidity on the packaging machine, and can maintain high production efficiency.
1235 aluminum foil is a main kind of cigarette aluminum foil papers. Its aluminum content is not less than 99.35%. It has good anti-rust properties, formability, and weldability. It is also of few pinholes, low cost, good shape and stable chemical properties.
The alloy composition of 1235 aluminum foil and 8011 aluminum foil is different. The difference in process lies in the annealing temperature. The annealing temperature of 1235 aluminum foil is lower than that of 8011 aluminum foil, but the annealing time is basically the same. The tensile strength of 8011 aluminum foil is higher than that of 1235 aluminum foil. At the same time, the elongation of 8011 aluminum foil is not much different from that of 1235 aluminum foil, but slightly higher.
At present, the domestic production of 6~7μm light gauge aluminum foil generally uses 1235 aluminum, while European and American manufacturers generally use AA8079 alloy. Compared with AA1235 alloy, AA8079 alloy has higher content of Fe and Si, which has higher mechanical properties and higher production efficiency.
Difficult control of thickness error is a feature of aluminum foil rolling. The thickness difference of 3% is not difficult to control in the production of plates and strips, but it is more difficult to control in the production of aluminum foil.
As the thickness of the aluminum foil is thinned, many micro-conditions can be affected, such as temperature, oil film, oil and gas concentration, etc. The only way to adjust the thickness of aluminum foil is tension and speed. These factors have all caused the difficulty in thickness control of aluminum foil rolling.
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