破(po)壞(huai)了電(dian)化(hua)鋁表面(mian)光(guang)(guang)澤性，圖文輪廓發虛(xu)：需要覆膜加工(gong)的(de)燙金，因(yin)擔心(xin)金箔容易擦(ca)落而(er)先燙印再覆膜。這易造(zao)成(cheng)(cheng)薄膜（尤(you)其(qi)是(shi)亞光(guang)(guang)膜）會破(po)壞(huai)電(dian)化(hua)鋁的(de)表面(mian)光(guang)(guang)澤性，也不(bu)(bu)宜采用(yong)水(shui)溶性膠水(shui)覆膜，否則會造(zao)成(cheng)(cheng)電(dian)化(hua)鋁表面(mian)發黑(hei)，同時極易造(zao)成(cheng)(cheng)金粉粘在圖文邊緣造(zao)成(cheng)(cheng)發虛(xu)現(xian)象。燙金后因(yin)壓(ya)力作(zuo)用(yong)而(er)凹陷，再加上膠水(shui)不(bu)(bu)易滲透電(dian)化(hua)鋁表層，易造(zao)成(cheng)(cheng)燙金處(chu)0PP與(yu)紙(zhi)張分離而(er)影(ying)響產品(pin)質量。正(zheng)確的(de)工(gong)藝是(shi)應先覆膜再燙金，選(xuan)擇(ze)與(yu)OPP相(xiang)匹配的(de)電(dian)化(hua)鋁。