Defect Analysis of Aluminum Foil（1）
2017/1/13 16:37:45
In the aluminum foil production process, to go through rolling, finishing, annealing, packaging and other processes, interlocking the production process, any link problems may lead to aluminum foil quality problems. Buy back the aluminum foil product quality defects will not only affect the appearance, but also directly affect the quality of products produced, and more directly lead to pull off aluminum foil and thus greatly affect the production efficiency. How to distinguish between good and bad aluminum foil it?
According to the summary of the experience of the aluminum industry, distinguish between the quality of aluminum foil can be directly used in most of your "eye" detection. However, to distinguish between good and bad aluminum foil we should first understand the common quality defects of aluminum foil which, only the heart with a few, and then control the quality of the common problems of aluminum foil one by one investigation in order to eliminate the quality defects of aluminum foil storage.
1. Aluminum foil bumps
Aluminum foil bruise is the foil in the handling or storage process, and other objects in the collision after the surface or end surface damage. Most of the bumps are caused by the aluminum foil packaging when not pay attention.
2. Corrosion
Aluminum foil surface and the surrounding medium contact, chemical reaction or electrochemical reaction, the aluminum foil surface defects, corrosion of aluminum foil surface will lose its luster, will produce serious gray corrosion products. After the corrosion of the aluminum foil on the terminal products produced by the aesthetic level will have a great impact.
3. Surface bubbles
The surface of the aluminum foil foil surface irregular irregular circular or strip cavity convex; convex edge smooth, asymmetric on both sides, the distribution of irregular, the surface of the bubble to the aluminum foil with the point of the force Imbalance, is likely to lead to pull off.
4. Dark surface stripes
Dark surface stripes appear mostly in the double-product, the dark side along the rolling direction of the obvious stripes and shades of white, affecting the appearance.
5. Prints
There are a number of conditions that can cause the surface of the aluminum foil to be imprinted. If the surface of the roll or guide roll is defective or has dirt such as metal shavings, the surface of the sleeve or die is not clean or locally smooth, or the surface of the foil Stick a foreign body and so on. The surface of the foil that is imprinted will typically have individual or periodic depressions or protrusions that are easily discernible.
6. Oil spots
Common aluminum foil oil is formed after annealing, generally pale yellow, brown, tan mark.
7. Degreasing is not the net
Detection of degreasing is clean, usually in the annealing, the use of brush water method to detect degreasing level, did not meet the requirements of the level of brush water test, aluminum foil is likely to have oil.
8. crack edge
Aluminum foil surface longitudinal edge of the phenomenon of rupture, said crack side. Severe visible edge of a significant gap.
9. Defective plate
Uneven deformation of the foil surface to produce uneven local phenomenon, known as the plate-type bad. According to the location of defects, divided into the middle wave, the edge wave, two-rib wave and composite wave. In the edge called the edge of the wave (pictured), in the middle called the middle wave, both called the composite wave, neither in the middle and not in the side called two-rib wave.
10. Adhesion
Aluminum foil leaflet is not easy to open, more than open when the plate was knotted, free fall length of the product can not meet the standard requirements, serious, leaflets can not be opened, aluminum foil adhesion will seriously affect product.
11. Holes
Foil surface prone to hole problems.
12. Loose volumes
As the coiling is not tight at the time of cutting, when the foil is pulled up along the direction of the core, the foil material is interlaced, and when the foil is pressed by the fingers, the phenomenon of local depression is produced.
13. Burr
After cutting, the foil edge of the existence of different sizes of thorns.
14. Split layer
The aluminum foil roll end layer layer and the layer between the irregular move, causes the end surface is not smooth.
15. Tower shape
Aluminum foil end-face layer and the layer of misalignment caused by the tower-like offset, known as the tower. The tower is a special case of the staggered layer, the side looks like a spire.
16. Alice edge
Aluminum foil roll ends or one end of the phenomenon of upturned, known as Alice, which is characterized by curling aluminum foil to the upper part, you can touch the hand, there will be a significant sense of concavity.
17. Pinhole
Aluminum foil surface visible irregular irregular holes for aluminum foil packaging materials production, pinhole problems will affect the sealing.