破壞了(le)電(dian)化(hua)(hua)鋁(lv)(lv)表面(mian)光(guang)(guang)澤性，圖文輪廓(kuo)發虛(xu)：需(xu)要覆(fu)膜加工的燙(tang)金，因(yin)擔(dan)心金箔容(rong)易(yi)擦落而先燙(tang)印再(zai)覆(fu)膜。這(zhe)易(yi)造(zao)成(cheng)(cheng)(cheng)薄膜（尤其(qi)是亞光(guang)(guang)膜）會(hui)破壞電(dian)化(hua)(hua)鋁(lv)(lv)的表面(mian)光(guang)(guang)澤性，也不宜采用(yong)水溶性膠水覆(fu)膜，否則會(hui)造(zao)成(cheng)(cheng)(cheng)電(dian)化(hua)(hua)鋁(lv)(lv)表面(mian)發黑(hei)，同時極易(yi)造(zao)成(cheng)(cheng)(cheng)金粉粘在圖文邊緣造(zao)成(cheng)(cheng)(cheng)發虛(xu)現象。燙(tang)金后因(yin)壓力(li)作用(yong)而凹陷，再(zai)加上(shang)膠水不易(yi)滲透電(dian)化(hua)(hua)鋁(lv)(lv)表層(ceng)，易(yi)造(zao)成(cheng)(cheng)(cheng)燙(tang)金處0PP與紙張分(fen)離而影(ying)響(xiang)產(chan)品(pin)質量。正確(que)的工藝(yi)是應(ying)先覆(fu)膜再(zai)燙(tang)金，選擇(ze)與OPP相匹配(pei)的電(dian)化(hua)(hua)鋁(lv)(lv)。