Swell-peeling method for paints on aluminum cans

摘要

Used aluminum beverage cans (UBC) are able to berecycled into can body material (JIS3004) by remelting. However,in these remelting processes, such problems attributed to "paints"occur as unfavorable molten metal composition (primarilytitanium) and lowering of molten metal yield. Consequently, forpromoting recycling of aluminum UBC, removal of these "paints"is essential. So far, the paints have been removed by thermalmethod etc. Previous paper reported the development of a swell-peeling method in which paints are chemically removed, ensuringthe good possibility of promoting recycling of aluminum UBC.This paper reports the details of swell-peeling mechanism.