在實際(ji)生產過程中，由于(yu)熱封(feng)(feng)(feng)(feng)(feng)(feng)(feng)壓(ya)(ya)力、制袋機速以及(ji)復(fu)合基材(cai)(cai)的(de)厚(hou)(hou)度(du)等多方面影響，實際(ji)采用的(de)熱封(feng)(feng)(feng)(feng)(feng)(feng)(feng)溫度(du)往(wang)往(wang)要高于(yu)熱封(feng)(feng)(feng)(feng)(feng)(feng)(feng)材(cai)(cai)料(liao)的(de)熔融溫度(du)。熱封(feng)(feng)(feng)(feng)(feng)(feng)(feng)的(de)壓(ya)(ya)力越小，要求熱封(feng)(feng)(feng)(feng)(feng)(feng)(feng)溫度(du)越高，機速越快，復(fu)合膜的(de)面層(ceng)材(cai)(cai)料(liao)越厚(hou)(hou)，要求的(de)熱封(feng)(feng)(feng)(feng)(feng)(feng)(feng)溫度(du)也越高。熱封(feng)(feng)(feng)(feng)(feng)(feng)(feng)溫度(du)若低于(yu)熱封(feng)(feng)(feng)(feng)(feng)(feng)(feng)材(cai)(cai)料(liao)的(de)軟化點，則無(wu)論(lun)怎樣加(jia)大壓(ya)(ya)力或延熱封(feng)(feng)(feng)(feng)(feng)(feng)(feng)時間(jian)，均不能使熱封(feng)(feng)(feng)(feng)(feng)(feng)(feng)層(ceng)真正封(feng)(feng)(feng)(feng)(feng)(feng)(feng)合。