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水汽透過率是指在一個指定的溫度條件的靜態穩定環境中，經過24小時(一天)的測試時間后滲透過1平米的測試材料的水蒸氣的克重。注：水汽透過率受測試材料的厚度和自身成分的影響很大。</p><p>　　</p><p> 干燥劑用量計算公式與參數</p><p>　　計算公式：</p><p>　　n=1/a*(V*b+m*c+A*e*WDD*t)</p><p>　　公式的各個參數、含義和計算值：</p><p style="text-align: center;"><img src="/Content/ueditor-builder/net/upload1/Other/13663/6367985670762552485453690.jpg" title="干燥劑廠家" width="831" height="785" border="0" hspace="0" vspace="0" style="width: 831px; height: 785px;"/></p><p><br/></p><p> 計算方法的進一步解釋說明：</p><p>　　實際上，用在密閉包裝中的干燥劑的作用是去除三個部分的水汽。即</p><p>　　-V*b產品包裝時候被封閉于整個包裝中空氣所含的水汽。</p><p>　　-m*c包裝物所含的水汽，特指包裝整個密閉包裝中的包裝物。</p><p>　　-A*e*WDD*t 在整個儲藏運輸過程中通過阻隔材料進入包裝內部的水汽。</p><p>　　達到“平衡濕度”的狀態是指干燥劑在將密閉包裝中的濕度控制在一定水平上，當有新的潮氣進入包裝時候，干燥劑繼續吸收，但包裝內的濕度不再改變;當然當進入的水汽過多，使得超過了干燥劑在該濕度條件下的吸濕能力的時候，平衡濕度就會上升。</p><p> <br/></p></div> <div class="pn"><div class="prevNext"> <p class="prev">上一條: <a href="http://www.intriguearticles.com/industry-102204">廣東回南天必備-氯化鈣干燥劑</a></p> <p class="next">下一條: <a 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