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影響干燥效果的因素有哪些?

更新時(shí)間:2013-03-15      點(diǎn)擊次數:1702

一、影響干燥效果的因素有:

  1、干燥溫度: 熱量是打開(kāi)水分子和吸濕聚合物之間合力的關(guān)鍵.當高于某一溫度時(shí),水分子和聚合物鏈間的引力會(huì )大大降低,水汽就被干燥的空氣帶走.
  2、露點(diǎn): 在干燥箱中,首先除去濕空氣,使之含有很低的殘留水分 ( 露點(diǎn) ) .然后,通過(guò)加熱空氣來(lái)降低它的相對濕度.這時(shí),干空氣的蒸汽壓力較低.通過(guò)加熱,顆粒內部的水分子擺脫了鍵合力束縛,向顆粒周?chē)目諝鈹U散.
  3、時(shí)間: 在顆粒周?chē)目諝庵?熱量的吸收和水分子向顆粒表面擴散需要一定的時(shí)間.因此,樹(shù)脂供應商應詳細說(shuō)明一種物料在適當的溫度和露點(diǎn)下得到有效干燥所必須花費的時(shí)間.
  4、氣流: 干燥的熱空氣將熱量傳遞給干燥料倉中的顆粒,除去顆粒表面的濕氣,然后把濕氣送回干燥器里.因此,必須有足夠的氣流將樹(shù)脂加熱到干燥溫度,并且將這個(gè)溫度維持一定的時(shí)間.
 

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