Quality issue Requirements
Where aluminium foil is utalized
Look around and you will find aluminium foil packaging in so many products, innerliner for cigarette packets ( aluminium foil with paper), aluminium tops for sealing yoghurt or butter cups, caps for milk bottles, beer bottle labels, medical packaging for push-out pills ( blister packaging ) or sachets for powder, aluminium foil in the kitchen for cooking or for the barbecue etc. The barrier properties of aluminium foil are of the best, cigarettes stay fresher and keep their taste longer, dairy goods stay and taste fresher thanks to the barrier effect of aluminium foil.
Shape ( Flatness ) Equipment
There are many big aluminium foil manufacturing companies who produce foil in different thicknesses, but mostly all experience the same problems, one of these being flatness. If the flatness is not good then your band or foil will present problems in the further production. Most mills are fitted with shape control, common are Siemens V.A.I.; Achenbach Optirol and ABB, the experts of these companies are unfortunately not all experts in foil rolling and this can result in undesired quality issues. The equipment itself in combination with mill rolling knowledge can allow you to acquire the perfect settings which will result in better flatness, less web breaks and more production due to less machine down time. If your separator’s are tuned to perfection and your annealing schedules have been chosen correctly then this combination will allow the aluminium foil to maintain it’s mechanical properties, tensile and yield strength, elongation etc. without wettability problems and thus result in better quality and satisfied customers.
Good quality through experience
Good quality is what everyone wants to achieve:- A minimum of pinholes ( porosity); good flatness; good surface with the proper brightness; without blemishes; roll marks; or scratches caused by working rolls; good quality slitting. High tensile and yield strength by choosing the proper annealing schedules; good wettability without stickiness. Aluminium foil quality issues are always a problem. First, you have to establish where the problem occurs. Is it a flatness question due to the working roll grinding or incorrect mill settings, does it come from the separator, or is it happening whilst annealing, or is it a combination of the above mentioned items. To find the answer, one has to recognize what the problem is; and know intimately how the aluminium foil is produced with all the steps it has to take before finally leaving your plant.