The aluminium foil production system is not so easy as you would possibly suppose. It consists of one melting and 3 rolling steps. Info are as beneath.
Smelting
Aluminium ingot blocks are melted into liquid through huge capacity drop heat smelting furnaces, and the aluminium liquid enters the casting mill thru the launder, inside the procedure of which the refiner a1-ti-b is brought online to form a continuous and uniform refining impact. The graphite rotor is degassed and slag removed on line at 730-735 ℃ to shape a continuous and uniform cleansing effect.
Rough Rolling
Aluminium blanks around 7mm thick are acquired within the manner of rough rolling, the first rolling step in aluminium foil manufacturing method. The aluminium liquid gets into the casting system in which the temperature of the cooling water inside the inner cavity of the roll body is managed under 20 and 23 degree centigrade, and that of the opening water among 28 and 32 ℃. In this technique the static stress of the aluminum melt between the rolls is saved at zero.004 or 0.005mpa, a good way to ensure that the crystal route of the blanks is more than 95% and the grain length much less than 5um.
Medium Rolling
Medium rolling stands between rough rolling and foil rolling. The aluminium foil blanks are rolled once more by using bloodless rolling mill until their thickness is reduced to four.5mm, whilst they're sent into annealing furnace of temperature 360 ℃. Two hours later, the furnace is heated as much as 580 ℃, and the blanks are held for 18 hours for homogenization annealing. In this manner the grain length of the blanks gets uniform. Another rolling within the bloodless rolling mill is finished, for the duration of which the foil gets thinner, less than 1mm thick. Then the foil blanks are annealed inside the furnace of given temperatures in set time durations once more. Sooner or later they reach zero.3mm thick on the quit of this step.
Foil Rolling
The foil gets thinner in a 4 roller irreversible foil rolling mill. Very last thickness of the foil levels between best zero.009mm to 0.2mm, commonly less than zero.1mm based totally on their various makes use of.
The process above is called bloodless rolling aluminium foil production system. In assessment to standard hot rolling technique, it saves each time and cost. What’s greater, the great of even the thinnest foil by way of this manner can compete with hot-rolled aluminum foil rolls. Many aluminium foil manufacturers in China adopt this technique nowadays.
The manufacturing method of the ultra-thin aluminum foil is brief in value, low in manufacturing investment and small in scale, and the pleasant of the extremely-thin aluminum foil produced can reach the most superior level in the world, in comparison with the recent rolling production procedure, the fee of funding inside the production of billets may be decreased through extra than half of.