時間:2018/3/8 13:05:56 瀏覽:98
環境(jing)溫(wen)(wen)(wen)度(du)(du)對封(feng)邊(bian)(bian)的粘(zhan)合(he)影(ying)響(xiang)是不(bu)可忽視的,準確說是因環境(jing)溫(wen)(wen)(wen)度(du)(du)影(ying)響(xiang)熱(re)(re)熔(rong)膠露置時(shi)(shi)(shi)間,當溫(wen)(wen)(wen)度(du)(du)偏低(di)時(shi)(shi)(shi),熱(re)(re)熔(rong)膠涂布在板(ban)或封(feng)邊(bian)(bian)條(tiao)上熱(re)(re)量(liang)很快被(bei)被(bei)粘(zhan)物吸收和擴散,使露置時(shi)(shi)(shi)間變短(duan)表(biao)面形(xing)成一層近(jin)似(si)隔離膜,這樣就(jiu)導致假性粘(zhan)膠(即粘(zhan)膠不(bu)牢),冬天(tian)(tian)封(feng)邊(bian)(bian)時(shi)(shi)(shi)溫(wen)(wen)(wen)度(du)(du)應(ying)(ying)比夏天(tian)(tian)設定約(yue)高15-20℃;當環境(jing)溫(wen)(wen)(wen)度(du)(du)偏高時(shi)(shi)(shi),熱(re)(re)量(liang)散發慢(man),露置時(shi)(shi)(shi)間延(yan)長.當工(gong)件(jian)連續(xu)進行時(shi)(shi)(shi)熱(re)(re)熔(rong)膠還未結晶(jing)凝固達(da)到時(shi)(shi)(shi)初(chu)粘(zhan)效(xiao)果,影(ying)響(xiang)連續(xu)加工(gong),甚至使較薄的塑膠封(feng)邊(bian)(bian)條(tiao)變形(xing),影(ying)響(xiang)封(feng)邊(bian)(bian)效(xiao)果,所以夏天(tian)(tian)封(feng)邊(bian)(bian)時(shi)(shi)(shi)溫(wen)(wen)(wen)度(du)(du)應(ying)(ying)設定低(di)一些. 當環境(jing)溫(wen)(wen)(wen)度(du)(du)特別低(di)時(shi)(shi)(shi),應(ying)(ying)對板(ban)材和ABS封(feng)邊(bian)(bian)條(tiao)進行預(yu)熱(re)(re)處理(也就(jiu)是常說的封(feng)邊(bian)(bian)怕冷現象),方能達(da)到理想粘(zhan)膠效(xiao)果.
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