在實際生產過程中，由于熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)壓力(li)(li)、制袋(dai)機(ji)(ji)速以及復合(he)基材的(de)厚度(du)(du)等多方面影(ying)響(xiang)，實際采用(yong)的(de)熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)溫(wen)(wen)度(du)(du)往往要高于熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)材料(liao)的(de)熔融溫(wen)(wen)度(du)(du)。熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)的(de)壓力(li)(li)越小，要求(qiu)熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)溫(wen)(wen)度(du)(du)越高，機(ji)(ji)速越快，復合(he)膜(mo)的(de)面層(ceng)材料(liao)越厚，要求(qiu)的(de)熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)溫(wen)(wen)度(du)(du)也越高。熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)溫(wen)(wen)度(du)(du)若低于熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)材料(liao)的(de)軟化點，則無論怎樣加大壓力(li)(li)或延熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)時間，均(jun)不能使熱(re)(re)封(feng)(feng)(feng)(feng)(feng)(feng)層(ceng)真正封(feng)(feng)(feng)(feng)(feng)(feng)合(he)。