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烘(hong)(hong)(hong)(hong)干(gan)(gan)機(ji)的(de)選(xuan)購(gou)要(yao)(yao)綜合(he)考慮很(hen)多(duo)因素(su)，如(ru)參(can)數(shu)、性能、價格等(deng)，除此以(yi)(yi)外(wai)(wai)，認(ren)為烘(hong)(hong)(hong)(hong)干(gan)(gan)機(ji)的(de)采(cai)購(gou)也可(ke)以(yi)(yi)從物料(liao)外(wai)(wai)形(xing)(xing)要(yao)(yao)求(qiu)出(chu)發，做出(chu)購(gou)買(mai)判斷(duan)。 烘(hong)(hong)(hong)(hong)干(gan)(gan)物料(liao)外(wai)(wai)形(xing)(xing)要(yao)(yao)求(qiu)主要(yao)(yao)分為兩類(lei)(lei)一(yi)類(lei)(lei)要(yao)(yao)求(qiu)烘(hong)(hong)(hong)(hong)干(gan)(gan)作業結束(shu)后(hou)，仍保持原料(liao)的(de)原形(xing)(xing)，如(ru)很(hen)多(duo)食品(pin)(pin)類(lei)(lei)的(de)烘(hong)(hong)(hong)(hong)干(gan)(gan)，建筑材料(liao)的(de)烘(hong)(hong)(hong)(hong)干(gan)(gan)等(deng)，此時的(de)烘(hong)(hong)(hong)(hong)干(gan)(gan)機(ji)選(xuan)擇(ze)(ze)就不(bu)應(ying)選(xuan)擇(ze)(ze)筒狀(zhuang)(zhuang)(zhuang)烘(hong)(hong)(hong)(hong)干(gan)(gan)設備(bei)了，而應(ying)選(xuan)擇(ze)(ze)氣流箱式(shi)烘(hong)(hong)(hong)(hong)干(gan)(gan)機(ji)。 另一(yi)類(lei)(lei)是把液(ye)體、泥狀(zhuang)(zhuang)(zhuang)（如(ru)煤泥、污泥等(deng)）、塊狀(zhuang)(zhuang)(zhuang)、粉(fen)(fen)狀(zhuang)(zhuang)(zhuang)的(de)物料(liao)烘(hong)(hong)(hong)(hong)干(gan)(gan)后(hou)，成為粉(fen)(fen)狀(zhuang)(zhuang)(zhuang)或(huo)顆粒(li)狀(zhuang)(zhuang)(zhuang)產品(pin)(pin)。有的(de)烘(hong)(hong)(hong)(hong)干(gan)(gan)過(guo)程，特別是藥品(pin)(pin)的(de)烘(hong)(hong)(hong)(hong)干(gan)(gan)，希望不(bu)破壞原來的(de)晶形(xing)(xing)。藥品(pin)(pin)生(sheng)產中，還(huan)常用(yong)到液(ye)體和粉(fen)(fen)狀(zhuang)(zhuang)(zhuang)物料(liao)經(jing)烘(hong)(hong)(hong)(hong)干(gan)(gan)后(hou)，達到一(yi)定粒(li)徑的(de)顆粒(li)。此類(lei)(lei)烘(hong)(hong)(hong)(hong)干(gan)(gan)物料(liao)使(shi)用(yong)一(yi)般工業用(yong)筒狀(zhuang)(zhuang)(zhuang)烘(hong)(hong)(hong)(hong)干(gan)(gan)機(ji)，具體型號，參(can)數(shu)才有比較的(de)意(yi)義。 由此可(ke)知(zhi)，烘(hong)(hong)(hong)(hong)干(gan)(gan)物料(liao)外(wai)(wai)形(xing)(xing)的(de)要(yao)(yao)求(qiu)對烘(hong)(hong)(hong)(hong)干(gan)(gan)機(ji)的(de)選(xuan)擇(ze)(ze)也起著非常重(zhong)要(yao)(yao)的(de)決(jue)定性作用(yong)，從用(yong)戶實(shi)際需求(qiu)出(chu)發，多(duo)方綜合(he)考慮才能選(xuan)擇(ze)(ze)最合(he)適(shi)的(de)烘(hong)(hong)(hong)(hong)干(gan)(gan)設備(bei)。