低熔點(dian)塑料包(bao)裝膜(mo)的(de)表(biao)面(mian)張力取決(jue)包(bao)裝膜(mo)表(biao)面(mian)自由能大小，而包(bao)裝膜(mo)表(biao)面(mian)能又取決(jue)于包(bao)裝膜(mo)材(cai)料本身的(de)分子結構。其表(biao)面(mian)自由能小，表(biao)面(mian)濕張力較低，一般為30達因/厘(li)米左右(you)。理論(lun)上講，若物體的(de)表(biao)面(mian)張力低於(wu)33達因/厘(li)米，普通的(de)油墨或粘合劑就無法附著(zhu)牢固，因此必須對其表(biao)面(mian)處(chu)(chu)(chu)理。低熔點(dian)塑料包(bao)裝膜(mo)表(biao)面(mian)處(chu)(chu)(chu)理的(de)方法有(you)：電(dian)暈處(chu)(chu)(chu)理法、化學處(chu)(chu)(chu)理法、機械打毛法、涂層法等，其中最常(chang)采用的(de)是(shi)電(dian)暈處(chu)(chu)(chu)理法。

　　電(dian)(dian)(dian)(dian)(dian)暈(yun)(yun)(yun)處(chu)(chu)理(li)(li)法的(de)(de)(de)(de)基本(ben)原理(li)(li)是(shi)：通(tong)過(guo)在金(jin)屬(shu)電(dian)(dian)(dian)(dian)(dian)極(ji)與(yu)電(dian)(dian)(dian)(dian)(dian)暈(yun)(yun)(yun)處(chu)(chu)理(li)(li)輥(gun)(一般(ban)為耐高(gao)溫、耐臭氧、高(gao)絕緣的(de)(de)(de)(de)硅橡膠輥(gun))之間(jian)施(shi)加(jia)高(gao)頻、高(gao)壓電(dian)(dian)(dian)(dian)(dian)源(yuan)，使(shi)(shi)之產(chan)生放(fang)電(dian)(dian)(dian)(dian)(dian)，於(wu)是(shi)使(shi)(shi)空氣電(dian)(dian)(dian)(dian)(dian)離并形成大(da)量臭氧。同時，高(gao)能量電(dian)(dian)(dian)(dian)(dian)火花沖擊薄膜(mo)(mo)表(biao)面。在它(ta)們的(de)(de)(de)(de)共同作用(yong)下，使(shi)(shi)低熔點塑(su)(su)料(liao)(liao)包(bao)(bao)裝膜(mo)(mo)表(biao)面產(chan)生活化、表(biao)面能增加(jia)。通(tong)過(guo)電(dian)(dian)(dian)(dian)(dian)暈(yun)(yun)(yun)處(chu)(chu)理(li)(li)可(ke)使(shi)(shi)低熔點塑(su)(su)料(liao)(liao)包(bao)(bao)裝膜(mo)(mo)的(de)(de)(de)(de)濕張(zhang)力提高(gao)到38達(da)(da)因/厘(li)米；可(ke)使(shi)(shi)低熔點塑(su)(su)料(liao)(liao)包(bao)(bao)裝膜(mo)(mo)的(de)(de)(de)(de)表(biao)面濕張(zhang)力達(da)(da)到52-56達(da)(da)因/厘(li)米以上。電(dian)(dian)(dian)(dian)(dian)暈(yun)(yun)(yun)處(chu)(chu)理(li)(li)低熔點塑(su)(su)料(liao)(liao)包(bao)(bao)裝膜(mo)(mo)表(biao)面濕張(zhang)力的(de)(de)(de)(de)大(da)小與(yu)施(shi)加(jia)於(wu)電(dian)(dian)(dian)(dian)(dian)極(ji)上的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)壓高(gao)低、電(dian)(dian)(dian)(dian)(dian)極(ji)與(yu)電(dian)(dian)(dian)(dian)(dian)暈(yun)(yun)(yun)處(chu)(chu)理(li)(li)輥(gun)之間(jian)的(de)(de)(de)(de)距離等因素(su)有(you)關。當然，電(dian)(dian)(dian)(dian)(dian)暈(yun)(yun)(yun)處(chu)(chu)理(li)(li)應當適(shi)度，并非(fei)電(dian)(dian)(dian)(dian)(dian)暈(yun)(yun)(yun)處(chu)(chu)理(li)(li)強度越高(gao)越好(hao)。這里(li)值得注(zhu)意(yi)的(de)(de)(de)(de)是(shi)低熔點塑(su)(su)料(liao)(liao)包(bao)(bao)裝膜(mo)(mo)與(yu)電(dian)(dian)(dian)(dian)(dian)暈(yun)(yun)(yun)處(chu)(chu)理(li)(li)輥(gun)之間(jian)應避(bi)免(mian)夾入(ru)空氣，否則有(you)可(ke)能使(shi)(shi)薄膜(mo)(mo)的(de)(de)(de)(de)反面也被電(dian)(dian)(dian)(dian)(dian)暈(yun)(yun)(yun)處(chu)(chu)理(li)(li)了。