在實(shi)際生(sheng)產過程中,由于(yu)熱(re)(re)封(feng)(feng)壓力、制袋機速以(yi)及(ji)復合(he)基材(cai)的厚(hou)度(du)等多方面(mian)影(ying)響,實(shi)際采用的熱(re)(re)封(feng)(feng)溫度(du)往(wang)往(wang)要(yao)(yao)高(gao)于(yu)熱(re)(re)封(feng)(feng)材(cai)料(liao)的熔融溫度(du)。熱(re)(re)封(feng)(feng)的壓力越(yue)小,要(yao)(yao)求(qiu)熱(re)(re)封(feng)(feng)溫度(du)越(yue)高(gao),機速越(yue)快,復合(he)膜的面(mian)層(ceng)材(cai)料(liao)越(yue)厚(hou),要(yao)(yao)求(qiu)的熱(re)(re)封(feng)(feng)溫度(du)也越(yue)高(gao)。熱(re)(re)封(feng)(feng)溫度(du)若低于(yu)熱(re)(re)封(feng)(feng)材(cai)料(liao)的軟化點,則無論怎(zen)樣加大(da)壓力或延熱(re)(re)封(feng)(feng)時間,均不能使熱(re)(re)封(feng)(feng)層(ceng)真正封(feng)(feng)合(he)。
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