選購在線連卷制袋機時要(yao)注意哪(na)些注意事(shi)項

    在線連卷制袋機廠家介紹說，封口(kou)機(ji)是一(yi)種適用于小型(xing)企(qi)業及(ji)家(jia)庭使用的(de)熱(re)合封口(kou)設備。通常使用220V交流(liu)電(dian)源，加熱(re)功率為數百瓦。各廠家(jia)生產的(de)封口(kou)機(ji)電(dian)路大同小異，現以(yi)FR-200型(xing)封口(kou)機(ji)為例(li)，剖析(xi)其電(dian)路的(de)工作(zuo)原(yuan)理和維(wei)修實例(li)。

    標稱加熱功率350W，封口(kou)最大(da)長度200mm。它(ta)有一個操作(zuo)手柄，其作(zuo)用有二(er)：一是壓下操作(zuo)手柄后(hou)，將(jiang)待封口(kou)塑料袋(dai)壓在加熱條(tiao)上，二(er)是壓下電(dian)(dian)源(yuan)開(kai)關(guan)K使之閉合。當(dang)開(kai)關(guan)K閉合后(hou)，交流電(dian)(dian)源(yuan)經R1、R2降(jiang)壓，二(er)極管(guan)D1整流．電(dian)(dian)容器C1濾波，向(xiang)本機提供工(gong)作(zuo)電(dian)(dian)源(yuan)。

    該電(dian)(dian)(dian)(dian)源經R4、VR向C2充電(dian)(dian)(dian)(dian)。充電(dian)(dian)(dian)(dian)初期，C2上電(dian)(dian)(dian)(dian)壓(ya)很小，三極管(guan)(guan)Q呈截止狀態，其集電(dian)(dian)(dian)(dian)極為(wei)高電(dian)(dian)(dian)(dian)平(ping)，經電(dian)(dian)(dian)(dian)阻R6和發光(guang)管(guan)(guan)LED觸發雙(shuang)向可(ke)控硅(gui)SCR，變(bian)壓(ya)器T得(de)電(dian)(dian)(dian)(dian)。其二是向加(jia)熱元件RL供電(dian)(dian)(dian)(dian)，被實(shi)壓(ya)在(zai)RL上的(de)塑料袋(dai)受熱而被封口。待C2充電(dian)(dian)(dian)(dian)致使三極管(guan)(guan)Q導通(tong)，集電(dian)(dian)(dian)(dian)極電(dian)(dian)(dian)(dian)壓(ya)降低，不足(zu)以觸發可(ke)控硅(gui)時，RL停止加(jia)熱，抬起手(shou)柄，取出塑料袋(dai)，封口即告完成(cheng)。手(shou)柄抬起，開關K斷開后，C2經D2和R3迅(xun)速放電(dian)(dian)(dian)(dian)，為(wei)卜一次充電(dian)(dian)(dian)(dian)作好準備(bei)。發光(guang)管(guan)(guan)LED在(zai)RL通(tong)電(dian)(dian)(dian)(dian)期間(jian)，發光(guang)管(guan)(guan)用于指示(shi)。調整電(dian)(dian)(dian)(dian)位(wei)器VR可(ke)改(gai)變(bian)每(mei)次封口加(jia)時的(de)長短，具體調整幅度(du)可(ke)根據工作時的(de)電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)壓(ya)和被封口塑料的(de)厚度(du)試驗決定。

    真(zhen)空包裝(zhuang)(zhuang)機品(pin)種繁多，在選(xuan)用時應著重考(kao)慮(lv)下列(lie)因素。包裝(zhuang)(zhuang)速度(du)。出(chu)于提(ti)高(gao)生(sheng)產效率的(de)(de)考(kao)慮(lv)，可(ke)選(xuan)用雙室或多室的(de)(de)真(zhen)空包裝(zhuang)(zhuang)機，以提(ti)高(gao)整個生(sheng)產的(de)(de)進度(du)。被包裝(zhuang)(zhuang)物品(pin)是否需要(yao)(yao)充填其他(ta)保護性(xing)氣體(ti)。可(ke)選(xuan)擇帶有(you)充氣裝(zhuang)(zhuang)置的(de)(de)多功能(neng)真(zhen)空包裝(zhuang)(zhuang)機。被包裝(zhuang)(zhuang)物品(pin)真(zhen)空度(du)的(de)(de)要(yao)(yao)求。如包裝(zhuang)(zhuang)物品(pin)需要(yao)(yao)在真(zhen)空度(du)較(jiao)高(gao)的(de)(de)條件(jian)下才能(neng)完好(hao)保存，則需選(xuan)擇腔式真(zhen)空包裝(zhuang)(zhuang)機。被包裝(zhuang)(zhuang)物品(pin)成分狀態對真(zhen)空包裝(zhuang)(zhuang)機的(de)(de)要(yao)(yao)求。

　　選(xuan)(xuan)購時，包(bao)裝(zhuang)固(gu)體、顆粒等比(bi)較(jiao)(jiao)干燥(zao)及無腐蝕(shi)性物料(liao)的，可選(xuan)(xuan)用(yong)(yong)(yong)鋁(lv)合(he)金材質(zhi)，而包(bao)裝(zhuang)帶湯汁，含鹽(yan)、酸(suan)成份較(jiao)(jiao)高的物料(liao)，則可選(xuan)(xuan)用(yong)(yong)(yong)不銹鋼材質(zhi)或鋁(lv)鎂(mei)合(he)金材質(zhi)。密封圈一般采用(yong)(yong)(yong)硅(gui)(gui)橡(xiang)(xiang)膠，黑橡(xiang)(xiang)膠，少數(shu)低檔產品采用(yong)(yong)(yong)發泡橡(xiang)(xiang)膠，硅(gui)(gui)橡(xiang)(xiang)膠耐高溫(wen)、耐腐蝕(shi)、密封性好、使用(yong)(yong)(yong)壽命長，發泡橡(xiang)(xiang)膠密封性差(cha)、易脫落(luo)、使用(yong)(yong)(yong)壽命短(duan)。