長沙夾層玻璃的(de)工藝是什么(me)樣的(de)呢?下(xia)面由(you)長(chang)沙(sha)霖(lin)湘玻璃小(xiao)編(bian)為您一起解答:
1、玻璃在高壓釜內的(de)操作工藝(yi)
高壓釜內的制作工藝,是長沙夾層玻璃生產的較后一道工序。經過預熱預壓處理的玻璃,為了使PVB膠片與玻璃合片更好的粘結在一起,還要經過恒溫高壓處理,才能夠使用。恒溫高壓處理要在高壓釜內操作,首先將粘合在一起的夾層玻璃的半成品,每片之間進行隔離,放入高壓釜專用臺架上,并使其牢固,然后緊閉釜門,對釜內加壓充氣,當釜內氣壓達到0.75MPa左右時,停止對釜內充氣。這是由于夾層玻璃邊緣未粘合牢固,為了使玻璃夾層中間的空間在壓力的作用下溢出,而不致于空氣從邊緣處進入夾層內。釜內溫度達到130℃左右時,立即停止加熱,并保持這個溫度。此時夾層玻璃已經能夠粘合,對釜內進行二次加壓,由于玻璃已經達到粘合溫度,故這次加壓不會使空氣進入夾層中,待壓力達到1.2MPa時,停止加壓并保持壓力平衡,持續經過1h~1.5h以后,降低釜內的溫度到50℃時,開始對釜內進行排氣降壓,直至空氣完全排出,開啟釜門推出玻璃。夾層玻璃制作至此,還有收尾工作,即是對玻璃進行逐片檢查,針對合格產品,進行修剪。割除周圍多余膠片;對含有氣泡和脫膠的玻璃進行挑選修補,重新進釜加壓加溫。
2、合片操作(zuo)工藝(yi)
對玻(bo)璃(li)(li)進行(xing)合(he)片(pian)(pian)(pian)(pian)操作時,首(shou)先要(yao)(yao)選擇(ze)適(shi)合(he)玻(bo)璃(li)(li)寬度(du)的(de)PVB膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)片(pian)(pian)(pian)(pian),并(bing)且要(yao)(yao)保持膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)片(pian)(pian)(pian)(pian)的(de)清潔,避免(mian)用手直接接角膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)片(pian)(pian)(pian)(pian)和玻(bo)璃(li)(li),將PVB膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)片(pian)(pian)(pian)(pian)自然展(zhan)平,不(bu)要(yao)(yao)拉(la)伸,對齊(qi)玻(bo)璃(li)(li)的(de)內外(wai)片(pian)(pian)(pian)(pian),不(bu)能(neng)有(you)參差不(bu)齊(qi)感,要(yao)(yao)查看(kan)預(yu)留的(de)標志是否重合(he),而后切(qie)除多余的(de)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)片(pian)(pian)(pian)(pian),在(zai)進行(xing)切(qie)割操作時,要(yao)(yao)使刀片(pian)(pian)(pian)(pian)保持傾斜,在(zai)合(he)片(pian)(pian)(pian)(pian)邊緣留出0.5mm~2mm膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)片(pian)(pian)(pian)(pian),為了避免(mian)膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)片(pian)(pian)(pian)(pian)收縮引起縮膜(mo)現象。合(he)好膠(jiao)(jiao)(jiao)(jiao)(jiao)(jiao)片(pian)(pian)(pian)(pian)與玻(bo)璃(li)(li)合(he)片(pian)(pian)(pian)(pian)以后,套真空橡(xiang)皮(pi)圈,并(bing)查看(kan)密封條,在(zai)玻(bo)璃(li)(li)四周受到的(de)拉(la)力要(yao)(yao)均勻,然后對玻(bo)璃(li)(li)進行(xing)冷(leng)抽使合(he)片(pian)(pian)(pian)(pian)中間(jian)的(de)空氣(qi)排除干凈(jing),且冷(leng)抽時間(jian)應不(bu)低于(yu)5min。
3、玻璃預(yu)(yu)熱(re)預(yu)(yu)壓工(gong)藝
玻(bo)(bo)(bo)(bo)璃(li)夾(jia)合好PVB膠片,抽空(kong)空(kong)氣以后,對合好的玻(bo)(bo)(bo)(bo)璃(li)進行(xing)(xing)預(yu)(yu)(yu)熱預(yu)(yu)(yu)壓操(cao)作(zuo)。進行(xing)(xing)預(yu)(yu)(yu)熱預(yu)(yu)(yu)壓操(cao)作(zuo)的設備有(you)三(san)種(zhong),一(yi)種(zhong)是(shi)預(yu)(yu)(yu)熱預(yu)(yu)(yu)壓箱(xiang),由(you)于(yu)其設備簡單且投資小、能耗低,所以被(bei)多家生(sheng)產廠家所青睞。但是(shi)預(yu)(yu)(yu)熱預(yu)(yu)(yu)壓箱(xiang)的缺點是(shi)效(xiao)率(lv)(lv)低,無法適(shi)(shi)應產業化生(sheng)產;傳動(dong)型(xing)立式與(yu)臥式的預(yu)(yu)(yu)熱預(yu)(yu)(yu)壓機(ji)(ji)(ji),這二(er)種(zhong)機(ji)(ji)(ji)械(xie)在(zai)生(sheng)產上效(xiao)率(lv)(lv)較(jiao)高,適(shi)(shi)合規(gui)模化生(sheng)產。二(er)者(zhe)區別是(shi),在(zai)放(fang)(fang)置玻(bo)(bo)(bo)(bo)璃(li)完成預(yu)(yu)(yu)熱預(yu)(yu)(yu)壓工(gong)作(zuo)時(shi),玻(bo)(bo)(bo)(bo)璃(li)的放(fang)(fang)置方(fang)式,一(yi)個(ge)是(shi)立放(fang)(fang),一(yi)個(ge)是(shi)平放(fang)(fang)。立式預(yu)(yu)(yu)熱預(yu)(yu)(yu)壓機(ji)(ji)(ji)對玻(bo)(bo)(bo)(bo)璃(li)進行(xing)(xing)空(kong)氣抽空(kong)操(cao)作(zuo)時(shi),對玻(bo)(bo)(bo)(bo)璃(li)的弧度(du)影響小。而臥式預(yu)(yu)(yu)熱熱壓機(ji)(ji)(ji)對玻(bo)(bo)(bo)(bo)璃(li)進行(xing)(xing)空(kong)氣抽空(kong)操(cao)作(zuo)時(shi),由(you)于(yu)玻(bo)(bo)(bo)(bo)璃(li)平放(fang)(fang),在(zai)自(zi)身的重(zhong)力與(yu)抽真空(kong)壓力的影響下,對玻(bo)(bo)(bo)(bo)璃(li)的弧度(du)產生(sheng)影響。所以臥式預(yu)(yu)(yu)熱預(yu)(yu)(yu)壓機(ji)(ji)(ji)在(zai)對大規(gui)格玻(bo)(bo)(bo)(bo)璃(li)的制作(zuo)上更為(wei)適(shi)(shi)宜。