熱(re)封(feng)(feng)(feng)次(ci)數(shu)越多，熱(re)封(feng)(feng)(feng)強度越高，縱向(xiang)熱(re)封(feng)(feng)(feng)次(ci)數(shu)取(qu)決(jue)于縱向(xiang)焊(han)棒的有效長度和袋長之比。
橫(heng)向(xiang)熱(re)封(feng)(feng)(feng)(feng)(feng)次數由(you)(you)機臺橫(heng)向(xiang)熱(re)封(feng)(feng)(feng)(feng)(feng)裝置(zhi)的(de)(de)(de)(de)組(zu)數決定(ding)。良(liang)好的(de)(de)(de)(de)熱(re)封(feng)(feng)(feng)(feng)(feng)，要求(qiu)熱(re)封(feng)(feng)(feng)(feng)(feng)次數至(zhi)少達到兩(liang)次以上(shang)。相同結構和(he)厚度(du)(du)的(de)(de)(de)(de)復(fu)合(he)(he)膜，復(fu)合(he)(he)層(ceng)(ceng)(ceng)(ceng)間剝(bo)離度(du)(du)越(yue)高，熱(re)封(feng)(feng)(feng)(feng)(feng)強(qiang)度(du)(du)越(yue)大；對(dui)于(yu)復(fu)合(he)(he)剝(bo)離強(qiang)度(du)(du)低的(de)(de)(de)(de)產(chan)品，焊(han)縫(feng)破壞往(wang)(wang)往(wang)(wang)是(shi)焊(han)縫(feng)處(chu)(chu)的(de)(de)(de)(de)復(fu)合(he)(he)膜先層(ceng)(ceng)(ceng)(ceng)間剝(bo)離，致使由(you)(you)內面(mian)熱(re)封(feng)(feng)(feng)(feng)(feng)層(ceng)(ceng)(ceng)(ceng)獨(du)立承受破壞拉力(li)，而(er)面(mian)層(ceng)(ceng)(ceng)(ceng)材料失去(qu)補強(qiang)作用，致使焊(han)縫(feng)的(de)(de)(de)(de)熱(re)封(feng)(feng)(feng)(feng)(feng)強(qiang)度(du)(du)由(you)(you)此(ci)大為降(jiang)低；若復(fu)合(he)(he)層(ceng)(ceng)(ceng)(ceng)間剝(bo)離度(du)(du)強(qiang)，則不致發生(sheng)焊(han)邊(bian)處(chu)(chu)層(ceng)(ceng)(ceng)(ceng)問的(de)(de)(de)(de)剝(bo)離，所測得的(de)(de)(de)(de)實際熱(re)封(feng)(feng)(feng)(feng)(feng)強(qiang)度(du)(du)就人得多(duo)；在熱(re)封(feng)(feng)(feng)(feng)(feng)內層(ceng)(ceng)(ceng)(ceng)為PE或OPP時，熱(re)封(feng)(feng)(feng)(feng)(feng)強(qiang)度(du)(du)就比同樣厚度(du)(du)的(de)(de)(de)(de)BOPP好得多(duo)。