熱封(feng)時(shi)間主(zhu)要由制袋機(ji)的速(su)度決定。
速(su)度(du)(du)快，熱(re)(re)封(feng)(feng)(feng)時(shi)(shi)(shi)間(jian)(jian)就短(duan)；速(su)度(du)(du)慢，熱(re)(re)封(feng)(feng)(feng)時(shi)(shi)(shi)間(jian)(jian)就長(chang)。熱(re)(re)封(feng)(feng)(feng)時(shi)(shi)(shi)間(jian)(jian)也(ye)是影(ying)響(xiang)焊(han)縫封(feng)(feng)(feng)合強(qiang)度(du)(du)和外觀的一(yi)個關鍵因(yin)素。相同的熱(re)(re)封(feng)(feng)(feng)溫(wen)度(du)(du)和壓(ya)力下(xia)，熱(re)(re)封(feng)(feng)(feng)時(shi)(shi)(shi)間(jian)(jian)長(chang)，則熱(re)(re)封(feng)(feng)(feng)層熔合更(geng)充分，結合更(geng)牢固；但(dan)(dan)熱(re)(re)封(feng)(feng)(feng)時(shi)(shi)(shi)間(jian)(jian)太(tai)長(chang)，容易造成焊(han)縫起皺變形，影(ying)響(xiang)平整(zheng)度(du)(du)和外觀。熱(re)(re)封(feng)(feng)(feng)后的焊(han)縫若冷卻(que)(que)不(bu)好，不(bu)但(dan)(dan)會影(ying)響(xiang)焊(han)疑的外觀平整(zheng)度(du)(du)，而且對熱(re)(re)封(feng)(feng)(feng)強(qiang)度(du)(du)有一(yi)定(ding)(ding)的影(ying)響(xiang)，冷卻(que)(que)過(guo)程就是通過(guo)在一(yi)定(ding)(ding)的壓(ya)力下(xia)，用較低的溫(wen)度(du)(du)對剛熔融熱(re)(re)封(feng)(feng)(feng)后的焊(han)縫進行定(ding)(ding)形。因(yin)此，壓(ya)力不(bu)夠，冷卻(que)(que)和循(xun)環不(bu)暢，循(xun)環量不(bu)夠，水(shui)溫(wen)太(tai)高或冷卻(que)(que)不(bu)及時(shi)(shi)(shi)，都會致使冷卻(que)(que)不(bu)良，熱(re)(re)封(feng)(feng)(feng)強(qiang)度(du)(du)降低。