小型預熱保溫爐注意事項:
已經(jing)受潮的石(shi)英砂(sha)(sha),尤(you)其是#6砂(sha)(sha)和(he)#8砂(sha)(sha)(因為粘度細(xi)),儲放(fang)過(guo)久(jiu)而(er)吸收空(kong)氣(qi)中(zhong)(zhong)的水份,應該先用干凈的鐵(tie)鍋炒下后(hou)再使(shi)用,將四種不(bu)同粒度的石(shi)英砂(sha)(sha)和(he)硼酸反復拌和(he)三次,使(shi)混(hun)合均(jun)勻,再用20目的鐵(tie)絲過(guo)篩二次,這樣不(bu)僅能(neng)(neng)提高(gao)它的混(hun)合均(jun)勻度,還能(neng)(neng)將一些外來(lai)夾(jia)雜(za)物(wu)(wu)篩去(qu),因為夾(jia)雜(za)物(wu)(wu)中(zhong)(zhong)的有(you)機物(wu)(wu)質,如紗頭,草(cao)節之類的東(dong)西混(hun)在石(shi)英砂(sha)(sha)中(zhong)(zhong),當爐(lu)子筑(zhu)好送電升溫后(hou),這些有(you)機物(wu)(wu)質將產生(sheng)氣(qi)體,可能(neng)(neng)導致(zhi)爐(lu)底面(mian)出現氣(qi)孔(kong)和(he)裂(lie)縫,影(ying)響爐(lu)子使(shi)用壽命,嚴重時可能(neng)(neng)發(fa)生(sheng)漏銅。