在實(shi)際(ji)生產過程中，由于熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)壓力、制袋機(ji)速以(yi)及復合基材的(de)(de)厚度(du)等多方(fang)面影響，實(shi)際(ji)采用的(de)(de)熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)溫度(du)往往要(yao)(yao)高于熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)材料(liao)的(de)(de)熔融溫度(du)。熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)的(de)(de)壓力越小，要(yao)(yao)求熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)溫度(du)越高，機(ji)速越快(kuai)，復合膜的(de)(de)面層材料(liao)越厚，要(yao)(yao)求的(de)(de)熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)溫度(du)也越高。熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)溫度(du)若低于熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)材料(liao)的(de)(de)軟化點(dian)，則無論怎樣加大壓力或延熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)時間，均不能使(shi)熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)層真正封(feng)(feng)(feng)(feng)(feng)(feng)合。