Aluminium Foil Quality For Food Wrapping
We are also very good in flatness control: flatness is an important technical indicator of foiled products. The expression and evaluation indexes of flatness are diverse, including warpage, crest, convexity, flatness value and so on. The factors that affect the flatness are: the original roll shape of the roll, the thermal expansion of the roll, the elastic flattening/bending of the roll, the wear of the roll, and the original shape of the blank.
Due to the heredity of the plate shape, in order to control the shape of the aluminum foil product, in addition to the coordinated operations such as tilting, bending, and regional cooling during the foil rolling process, it is also necessary to focus on the blank shape of the aluminum foil. When aluminum foil blanks are cold rolled, the on-line profile measurement of the strip tension is often good, while the off-line profile is poor, because the aluminum foil blanks have low strength relative to other alloys and are greatly affected by tension, making it difficult to perform real on-line tension. Plate-shaped.
In addition, due to the presence of positive convexity, the thickness of the middle position of the coil is continuously accumulated during the coiling and coiling process, and the diameter deviation between the middle of the coil and the two sides of the coil will gradually increase. , This is the effect of canopy accumulation.
As a result, the tension distribution in the width direction of the strip is uneven, and the tensile stress of the strip in the middle of the coil becomes larger and larger as the diameter of the coil increases, which provides an error signal for the measurement. And affect the automatic control of profiles. Similarly, because aluminum foil blanks are softer than other alloys, the cumulative effect of this convexity has a greater impact on the shape of aluminum foil blanks. Therefore, for the shape of aluminum foil, we focus on the shape of the blank, and the shape of the blank should focus on the influence of its offline shape and convexity accumulation.
Uses Of Aluminium Foil The control of chemical composition is very important.
