在實(shi)際生產過程中，由于熱(re)(re)(re)封(feng)(feng)壓力(li)、制(zhi)袋(dai)機(ji)速以及復合基(ji)材(cai)的厚度等(deng)多方面(mian)影響，實(shi)際采用的熱(re)(re)(re)封(feng)(feng)溫(wen)(wen)度往往要(yao)高(gao)于熱(re)(re)(re)封(feng)(feng)材(cai)料(liao)的熔(rong)融溫(wen)(wen)度。熱(re)(re)(re)封(feng)(feng)的壓力(li)越(yue)小，要(yao)求熱(re)(re)(re)封(feng)(feng)溫(wen)(wen)度越(yue)高(gao)，機(ji)速越(yue)快，復合膜的面(mian)層(ceng)材(cai)料(liao)越(yue)厚，要(yao)求的熱(re)(re)(re)封(feng)(feng)溫(wen)(wen)度也(ye)越(yue)高(gao)。熱(re)(re)(re)封(feng)(feng)溫(wen)(wen)度若低(di)于熱(re)(re)(re)封(feng)(feng)材(cai)料(liao)的軟(ruan)化點，則無論怎(zen)樣加大壓力(li)或(huo)延熱(re)(re)(re)封(feng)(feng)時間，均不能使熱(re)(re)(re)封(feng)(feng)層(ceng)真(zhen)正封(feng)(feng)合。