在實際生產過程中，由于(yu)熱(re)封(feng)(feng)(feng)(feng)壓力、制袋機速(su)以及復(fu)合基材(cai)(cai)(cai)的厚度等多方面影響(xiang)，實際采用的熱(re)封(feng)(feng)(feng)(feng)溫(wen)度往(wang)往(wang)要(yao)高(gao)于(yu)熱(re)封(feng)(feng)(feng)(feng)材(cai)(cai)(cai)料的熔融溫(wen)度。熱(re)封(feng)(feng)(feng)(feng)的壓力越(yue)小，要(yao)求熱(re)封(feng)(feng)(feng)(feng)溫(wen)度越(yue)高(gao)，機速(su)越(yue)快，復(fu)合膜的面層材(cai)(cai)(cai)料越(yue)厚，要(yao)求的熱(re)封(feng)(feng)(feng)(feng)溫(wen)度也越(yue)高(gao)。熱(re)封(feng)(feng)(feng)(feng)溫(wen)度若低于(yu)熱(re)封(feng)(feng)(feng)(feng)材(cai)(cai)(cai)料的軟化點，則(ze)無論(lun)怎樣加大(da)壓力或延熱(re)封(feng)(feng)(feng)(feng)時間，均不能使熱(re)封(feng)(feng)(feng)(feng)層真正封(feng)(feng)(feng)(feng)合。