Common quality defects of
aluminium foil
In the process of rolling into a variety of aluminium foil semi-finished products and finished products, as well as in the foil finishing, annealing, transport, packaging and other processes in the production process, inevitably some defects. Some of these defects are caused by defects in the ingot and cast strip itself, sometimes in the form of an ingot and a casting process, which can not be found and can only be exposed during subsequent further processing; the other is in the foil Material rolling, finishing, annealing, transportation, packaging and other processes produced in the process.
Most of these defects are due to equipment failure, violation of operating procedures, improper adjustment of process parameters, unskilled operator skills and other causes. In the aluminium foil production process, resulting in many defects in the quality of
aluminium foil, mainly a large number of pinholes, thickness tolerance, flatness difference, a variety of reasons such as the broken belt, to reduce these defects, to improve the quality of foil is very meaningful.
Aluminium foil is rolled in a very thin state, the thickness of the material uniformity, rolling speed, tension, rolling oil are very sensitive, in a variety of defects in the most critical is to solve the broken and pinhole, especially on High speed rolling mill is more important. The generation of the belt and the pinhole is very close to the quality of the aluminium foil blank.
Casting and rolling, hot-rolled blanks in the inclusion, airway, rolling process of metal and non-metallic pressure, rub, scratches and uneven thickness can cause great difficulties in rolling
aluminium foil caused by broken, pinholes , Thickness tolerance and so on. And these defects affect each other, the more aluminium the more thin pinhole, the more the pinhole is more likely to cut off, broken with more, rolling speed in the head and tail must have a part of the foil thickness tolerance.