破(po)(po)壞了電(dian)(dian)(dian)化(hua)鋁(lv)表面(mian)光(guang)澤性(xing)，圖文(wen)輪廓(kuo)發虛(xu)：需要覆膜(mo)加工的燙金，因(yin)擔心金箔容(rong)易擦落而先(xian)燙印再(zai)覆膜(mo)。這易造成(cheng)(cheng)薄膜(mo)（尤(you)其(qi)是亞(ya)光(guang)膜(mo)）會破(po)(po)壞電(dian)(dian)(dian)化(hua)鋁(lv)的表面(mian)光(guang)澤性(xing)，也不宜采(cai)用水溶性(xing)膠水覆膜(mo)，否則會造成(cheng)(cheng)電(dian)(dian)(dian)化(hua)鋁(lv)表面(mian)發黑(hei)，同時(shi)極易造成(cheng)(cheng)金粉粘在圖文(wen)邊緣造成(cheng)(cheng)發虛(xu)現象。燙金后因(yin)壓力作用而凹(ao)陷，再(zai)加上膠水不易滲透電(dian)(dian)(dian)化(hua)鋁(lv)表層，易造成(cheng)(cheng)燙金處0PP與(yu)(yu)紙張分離而影響(xiang)產品質量。正確的工藝是應先(xian)覆膜(mo)再(zai)燙金，選擇(ze)與(yu)(yu)OPP相匹配(pei)的電(dian)(dian)(dian)化(hua)鋁(lv)。