Common quality problems of aluminium foil jumbo roll
Feb 18, 2022
Common quality problems of aluminium foil jumbo roll
The appearance of quality defects in aluminium foil jumbo roll products will not only affect the appearance, but also directly affect the quality of the products you produce. What’s more, it will directly cause the aluminium foil jumbo roll to break and stop, which will greatly affect the production efficiency. So how to distinguish the quality of aluminium foil jumbo roll? To distinguish the quality of aluminium foil jumbo roll, we should first understand the common quality defects of aluminium foil jumbo roll. Only when we have an idea, and then check the common aluminium foil jumbo roll quality problems one by one, can we prevent the aluminium foil jumbo roll with quality defects from being put into storage. Today, we have sorted out the most complete aluminium foil jumbo roll quality defect problems in history, and attached a high-definition picture of the aluminium foil jumbo roll in question. When we buy back the aluminium foil jumbo roll, we only need to diagnose the problem again for this batch of aluminium foil jumbo roll. The quality is good or bad. You can get it!
1. aluminium foil jumbo roll bumps
aluminium foil jumbo roll bump refers to the damage to the surface or end face of the foil after it collides with other objects during handling or storage. Bumps are mostly caused by inattentive packaging in aluminium foil jumbo roll.
2. Corrosion
The surface of the aluminium foil jumbo roll is in contact with the surrounding medium, and after the chemical reaction or electrochemical reaction occurs, the defects on the surface of the aluminium foil jumbo roll, the corroded surface of the aluminium foil jumbo roll will lose its luster, and in severe cases, gray corrosion products will be produced. The corroded aluminium foil jumbo roll will have a great impact on the aesthetics of the products produced by the terminal.
3. Surface bubbles
The aluminium foil jumbo roll with surface bubble defects will have irregular circular or strip-shaped cavity protrusions on the surface of the foil; the raised edges are smooth, the two sides are asymmetrical, and the distribution is irregular. The surface bubbles cause the aluminium foil jumbo roll to be stressed at each point Unbalanced, it is very likely to lead to breakage and downtime.
4. Dark stripes
The dark side stripes mostly appear on the double-helix products, and the dark side has obvious light and dark stripe patterns along the rolling direction, which affects the appearance.
5. Imprints
There are many conditions that can cause imprinting on the surface of the aluminium foil jumbo roll, such as defects on the surface of the roller or guide roller or dirt such as metal chips stuck on the surface, the surface of the sleeve or die is not clean or there are local smooth bumps, or the surface of the foil during coiling. There are foreign objects stuck, etc. Imprinted foil surfaces generally have single or periodic depressions or bumps that are easy to identify.
6. Oil spots
Common aluminium foil jumbo roll oil stains are formed after annealing, and are generally light yellow, brown, and tan stains, as shown in the figure below.
7. Degreasing is not clean
To test whether the degreasing is clean, generally after annealing, the degreasing level is detected by the water brushing method. If the level specified by the water brushing test is not reached, there may be oil on the aluminium foil jumbo roll.
