熱封時間主要由(you)制(zhi)袋(dai)機的(de)速度決定。
速(su)度(du)(du)(du)快，熱(re)(re)(re)封(feng)(feng)(feng)時間(jian)(jian)就(jiu)(jiu)短；速(su)度(du)(du)(du)慢，熱(re)(re)(re)封(feng)(feng)(feng)時間(jian)(jian)就(jiu)(jiu)長(chang)。熱(re)(re)(re)封(feng)(feng)(feng)時間(jian)(jian)也是影(ying)(ying)響(xiang)焊(han)縫(feng)封(feng)(feng)(feng)合(he)強度(du)(du)(du)和(he)外(wai)(wai)觀(guan)的一(yi)個關鍵(jian)因素。相(xiang)同(tong)的熱(re)(re)(re)封(feng)(feng)(feng)溫(wen)度(du)(du)(du)和(he)壓(ya)力下(xia)，熱(re)(re)(re)封(feng)(feng)(feng)時間(jian)(jian)長(chang)，則(ze)熱(re)(re)(re)封(feng)(feng)(feng)層熔(rong)(rong)合(he)更充分，結(jie)合(he)更牢(lao)固；但熱(re)(re)(re)封(feng)(feng)(feng)時間(jian)(jian)太長(chang)，容易(yi)造成焊(han)縫(feng)起皺變形(xing)(xing)，影(ying)(ying)響(xiang)平整度(du)(du)(du)和(he)外(wai)(wai)觀(guan)。熱(re)(re)(re)封(feng)(feng)(feng)后的焊(han)縫(feng)若冷(leng)卻(que)不(bu)(bu)(bu)好，不(bu)(bu)(bu)但會影(ying)(ying)響(xiang)焊(han)疑(yi)的外(wai)(wai)觀(guan)平整度(du)(du)(du)，而且(qie)對(dui)熱(re)(re)(re)封(feng)(feng)(feng)強度(du)(du)(du)有一(yi)定的影(ying)(ying)響(xiang)，冷(leng)卻(que)過程(cheng)就(jiu)(jiu)是通過在一(yi)定的壓(ya)力下(xia)，用較(jiao)低的溫(wen)度(du)(du)(du)對(dui)剛(gang)熔(rong)(rong)融熱(re)(re)(re)封(feng)(feng)(feng)后的焊(han)縫(feng)進行定形(xing)(xing)。因此，壓(ya)力不(bu)(bu)(bu)夠(gou)，冷(leng)卻(que)和(he)循(xun)環(huan)不(bu)(bu)(bu)暢，循(xun)環(huan)量不(bu)(bu)(bu)夠(gou)，水溫(wen)太高或冷(leng)卻(que)不(bu)(bu)(bu)及時，都會致使冷(leng)卻(que)不(bu)(bu)(bu)良，熱(re)(re)(re)封(feng)(feng)(feng)強度(du)(du)(du)降低。