在實(shi)際(ji)生產過(guo)程中(zhong),由于熱(re)封(feng)(feng)(feng)壓(ya)力(li)、制袋機速以及復合基材(cai)(cai)的厚度(du)等(deng)多方面影響,實(shi)際(ji)采用的熱(re)封(feng)(feng)(feng)溫(wen)度(du)往往要高(gao)于熱(re)封(feng)(feng)(feng)材(cai)(cai)料(liao)的熔融溫(wen)度(du)。熱(re)封(feng)(feng)(feng)的壓(ya)力(li)越(yue)(yue)小,要求熱(re)封(feng)(feng)(feng)溫(wen)度(du)越(yue)(yue)高(gao),機速越(yue)(yue)快,復合膜的面層(ceng)材(cai)(cai)料(liao)越(yue)(yue)厚,要求的熱(re)封(feng)(feng)(feng)溫(wen)度(du)也越(yue)(yue)高(gao)。熱(re)封(feng)(feng)(feng)溫(wen)度(du)若低于熱(re)封(feng)(feng)(feng)材(cai)(cai)料(liao)的軟化(hua)點,則無論怎樣加(jia)大壓(ya)力(li)或延熱(re)封(feng)(feng)(feng)時間,均不(bu)能(neng)使熱(re)封(feng)(feng)(feng)層(ceng)真正(zheng)封(feng)(feng)(feng)合。
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