In the production process of aluminium sheet and strip, because of equipment or personnel operating errors and other reasons, there are simple quality problems. Here, the aluminium industry summarizes the common quality problems as follows, hoping that the production part can pay attention to this problem.
Oil contamination is common in quality problems. Oil contamination refers to the excessive oil on the surface of aluminium tip after rolling, and the excess oil besides rolling oil film, which can be seen by naked eyes in the process of slicing, fabrication and inspection of finished products.
These oils are mainly caused by throwing, splashing, dripping on the surface of the box, abnormal roll cleaner and oil dripping on the thickness gauge head of the rolling mill at the neck of the roll or at the exit of the mill, and are often complicated in composition.
This kind of oil pollution will bring great harm to the appearance of aluminium coil. First, because most of the finished products of aluminium coil are used as decoration or packaging materials, they must have a clean appearance and their thickness is thin. It is easy to form bubbles during subsequent annealing, and the use of aluminium coil is affected by the excessive amount of oil residues in the area. The defect of oil pollution is an important index to evaluate the quality of aluminium foil.
Solution: Strictly inspect the production equipment before making. If it is found that there is too much oil in the equipment, it is necessary to clean and find out the reason in time. At the same time, it is necessary to clean the surface of the production products. If the products that can not be cleaned are scrapped, the products with oil pollution are prohibited from entering the warehouse and entering the market.
Scratches are frequent customers of quality problems: scratches, scratches and bruises are discontinuous or continuous on the surface of aluminium sheets. Single groove wounds. It usually happens when sharp objects and foil surface touch and slide relatively.
The main reasons for the occurrence are as follows: the appearance of rolls and guide rolls has pointed defects, or there are hard debris shearing, winding, slitting mechanical guide rolls, guide way has pointed defects or dry debris.
Scratches: Bundles (or groups) of scars on the outside of a box caused by relative sliding or dislocation of edges or surfaces between objects after touching.
The above information is collated and released by our aluminium plate manufacturers. I hope you will like our website: !