超輕薄6μm鋁箔之開發

Development of Super-Thin < 6μm Aluminum Foils

石漢正 ； 庾忠義 ； 陳博偉

《鑛冶：中國鑛冶工程學會會刊》 57卷4期 (2013/12) Pp. 27-47

https://doi.org/10.30069/MM.201312_57(4).0005

摘要

Aluminum foils have been widely used in packaging industry, mainly due to their excellent moisture-proof and light weight. Moreover, the production costs of foils can be largely lowered while further reducing their thickness because of extended applicable area or length. However, the problems of pinhole, strip-breaking and surface hair line will thus be introduced, resulting in bad quality and lower production rate. Through this study, coarse grains, insufficient ductility, internal and external defects and uneven foil profiles have been found to be responsible for the above problems. Based on these findings, in order to improve material's properties, melt purification, grain refinement and casting conditions were adjusted together with the development of metallurgical processes for rolling and annealing. The three-dimensional finite element model for foil rolling was also established to improve its flatness. In addition, the instability in quality resulting from various external defects in production lines has been eliminated. After solving the above problems, China Steel Aluminum Corporation has already produced successfully super-thin aluminum foils of ≤ 6.0μm thickness, whose four quality indexes have achieved the levels of advanced aluminum factories (i.e., pinhole rate ＜500 pieces/m2, pinhole diameter ＜10μm, strip-breaking rate ＜3 times/coil, no surface hair lines). Finally, this company now is not dependent on foreign foil stocks again and then makes a great amount of income farther.

關鍵字

鋁箔 ； 針孔率 ； 斷帶率 ； 表面髮絲

並列摘要

Aluminum foils have been widely used in packaging industry, mainly due to their excellent moisture-proof and light weight. Moreover, the production costs of foils can be largely lowered while further reducing their thickness because of extended applicable area or length. However, the problems of pinhole, strip-breaking and surface hair line will thus be introduced, resulting in bad quality and lower production rate. Through this study, coarse grains, insufficient ductility, internal and external defects and uneven foil profiles have been found to be responsible for the above problems. Based on these findings, in order to improve material's properties, melt purification, grain refinement and casting conditions were adjusted together with the development of metallurgical processes for rolling and annealing. The three-dimensional finite element model for foil rolling was also established to improve its flatness. In addition, the instability in quality resulting from various external defects in production lines has been eliminated. After solving the above problems, China Steel Aluminum Corporation has already produced successfully super-thin aluminum foils of ≤ 6.0μm thickness, whose four quality indexes have achieved the levels of advanced aluminum factories (i.e., pinhole rate ＜500 pieces/m2, pinhole diameter ＜10μm, strip-breaking rate ＜3 times/coil, no surface hair lines). Finally, this company now is not dependent on foreign foil stocks again and then makes a great amount of income farther.

並列關鍵字

Aluminum foil ； Pinhole ； Strip breakdown ； Surface hair lines