PT. Supra Aluminium Industri is one of those companies producing aluminium foil with thicknesses as 7, 9, 12, 15, 18, 20 and 30 microns. Of all these thicknesses, aluminium foil with a thickness of 7 microns is one of PT. Supra’s top products. Aluminium foil with a thickness of 7 microns has several types of width specifications, i.e. 600-1100 mm. Based on the observations in the field, it is…