臺灣博碩士論文加值系統

本文針對紅外線輻射應用在PVA/水溶液薄膜乾燥上的效用與特性進行實驗分析，並對於乾燥設備進行改裝測試，將原有熱風狹縫噴嘴式烘箱加以改造，加裝紅外線石英燈管與反射罩於噴嘴狹縫間，對於單純熱風乾燥與紅外線輻射伴隨熱風乾燥的效果比較之間的差異，並改變不同的乾燥性質與操作參數，如紅外線加熱器位置、塗膜厚度、加熱溫度、熱風風量等，討論其對於乾燥速率的影響。
對於PVA/水溶液薄膜乾燥，由實驗結果發現紅外線輻射最主要能增進高含水率區間的乾燥速率，並證實紅外線加熱器位於整個烘箱的前半段的乾燥效果要比在後段來的好。
對於紅外線伴隨熱風乾燥實驗中，紅外線溫度、熱風溫度升高與增加熱風風量均可以提升乾燥速率，而在無風單純紅外線乾燥實驗，雖然紅外線亦有增加乾燥速率的效果，但乾燥速率很低，既熱風加熱所提供的對流熱傳速率，是薄膜乾燥中重要的熱傳條件，紅外線輻射則是能夠在熱風乾燥條件下，有效增加乾燥速率的加熱方式，且熱風在系統中亦有減少薄膜表面空氣中溶液濃度的作用，可以提升溶液的質傳速率。
此外當薄膜厚度較小時，紅外線輻射的效果非常顯著，可以增加含水率高時的乾燥速率，但隨著薄膜厚度增加，紅外線輻射乾燥的效果則相對減少，當薄膜厚度為1mm時，已經完全無法顯現其效果，主要是因為薄膜厚度增加，乾燥速率的快慢變成質傳速率所決定，就算增加外界熱傳速率也無法改善乾燥的效果。

摘要I
目錄II
附圖目錄IV
附表目錄VII
1.緒論1
1-1.紅外線乾燥基本原理1
1-1-1.紅外線分類1
1-1-2.紅外線乾燥原理2
1-1-3.紅外線放射器6
1-2.文獻回顧8
1-2-1. 熱風乾燥理論分析9
1-2-2. 紅外線乾燥理論分析9
1-3.理論推導12
1-4.紅外線乾燥的優缺點16
1-5.乾燥缺陷18
1-6.紅外線乾燥在工業上的應用21
2.實驗設備與方式22
2-1.實驗藥品與配製22
2-2.實驗設備23
2-3.紅外線乾燥基礎實驗26
2-3-1.實驗裝置26
2-3-2.實驗方式27
2-3-3.實驗步驟27
2-4.連續式塗佈乾燥實驗方式與設備30
2-4-1.實驗裝置30
2-4-2.實驗方式32
2-4-3.實驗步驟34
3.紅外線乾燥基礎實驗44
3-1.溫度100℃∼130℃，比較熱風與紅外線加熱之乾燥效果44
3-2.比較在單純加熱源時，熱風加熱與完全無風時紅外線加熱的效果47
3-3.比較紅外線伴隨熱風乾燥實驗，改變熱風溫度與紅外線溫度所增加的乾燥效果48
3-4.比較在不同薄膜厚度下，熱風與紅外線加熱的乾燥效果49
3-5.烘箱長度預測50
4.連續式塗佈乾燥實驗結果與討論78
4-1.熱風加熱伴隨紅外線輻射乾燥效果比較78
4-2.紅外線在不同烘箱位置的乾燥效果比較80
4-3.增加熱風風量與熱風溫度對於紅外線乾燥效果的影響82
4-4.膜厚增加對於紅外線乾燥效果的影響84
5.結論103
參考文獻105
符號說明107

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