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nature : materials and mobile drying medium direction opposite direction of the flow of a kind drying equipment. Import-humidity materials with high humidity and low temperature drying medium in contact; Exports of the small-humidity materials and humidity small and high temperature drying medium accessible. All within the dry part of the driving force similar to that distributed more evenly. Occasions applies to the following : (a) material when high humidity does not allow rapid drying, in order to avoid cracks; (2) After drying the materials can withstand high temperatures, not a chemical decomposition, oxidation change; (3) After drying the materials with greater humidity; (4) request materials drying rate, the same day as the extent of drying. Weaknesses are : dry materials and media contacts in the import side, the media will condensing steam in the materials, the increased humidity of materials, even drying time, it will also affect productivity.
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