كيف يصنع ورق الالمونيوم القصدير

the manufacturer of aluminum foil requires the repeated thinning out of large block of aluminum We Begin by melting ingots of 100% pure aluminum in natural gas furnace these ingots called pigs are essential in Alloys with zinc titanium and silica takes 3 to 8 hours to melt 27,000 kilos of aluminum in this remelting furnace which operates at 750° centigrade the fusion temperature of aluminum is 60° Centigrade portion of aluminum is poured into this small mold to make sample solidifying in just seconds the sample allows for testing to verify the contents of the prepared alloy this trough is used to transfer the aluminum from the remelting furnace to the tapping well molten aluminum runs in movable trough located above the tapping well at this stage impurities are filtered out in special receptacles the molds are cooled with water to accelerate the solidification of the molten aluminum ingots are unmolded and are ready for Milling each Ingot is massive measuring 4.4 in length 1.4 in width and is 45 cm thick it weighs whopping 7500 kilos so it has to be handled by overhead cranes and placed on special plates this crust removing machine removes 3 of the ingots thickness impurities are eliminated to achieve perfectly smooth finish all traces of the liquid used to cool the decus knives have to be eliminated the many steps in the thinning of the Ingot Begins the aluminum block is crushed by the hot Mill rollers temperatures in the rollers are between 455 and 540° centigrade pressure on the Ingot is continually verified by technician if too great it's lowered and the technician then adjust the pressure the heat is so high that the Ingot risks sticking to the Mills roller to prevent this everything is cooled with liquid that's 95% water and 5% oil starting from thickness of 45 cm the Ingot becomes increasingly thinner with each pass through depending on requirements the Ingot will go through the machine between 12 and 16 times the Ingot now measures 7 cm in thickness it has to get down to just half CM at this stage the Ingot is 5 cm thick and measures little over 9 in length this conveyor transports the plate during its Milling stages the Ingot has now become 5 thick sheet it is sufficiently thin to proceed to spooling where it spools onto itself before being sent to the Cold Rolling Mill where its thickness will be reduced still further the aluminum sheet has become very thin now and risks being broken by the tension needed for Cold Rolling so the sheet is doubled to avoid this breakage one final reduction in the mill and the sheet will have the thickness required by the customer liquid coolant is used to prevent the foil from sticking to the rollers since the edges of the foil sheet are lightly damaged and crinkled knife removes 1 cm thin strip finally the roll is cut to the desired width and one huge Ingot has produced foil measuring 12.7 km in length yeah