• 作者： 劉正字
• 作者服務機構： 國立中興大學森林學研究所
• 中文摘要： 在行工廠工業化試驗之前，先就稻殼施行烘乾、熱水抽出或 1%氫氧化鈉抽出等前處理後，再行粉碎，以觀察前處理對粉碎性質之影響。經烘乾或熱水抽出者，可增快粉碎速度，縮短粉碎時間，熱水抽出者稍有增加細粉（通過100網目者）收率之效果，兩種處理對增強合板之耐水膠合力並無顯著之效果。使用 1%氫氧化鈉抽出者，對於粉碎速度、通過 100 網目細粉之收率及合板膠合力，大多無正效果。因此工業化試驗乃將不經任何前處理之通過 100 網目之稻殼粉作為填料，在合板工廠以實際製造程序製造合板。對 UF 膠添加稻殼粉和麵粉各 7.5%之膠液，黏度1,200～1,300 cps (30°C），pH 5.6，適合於塗布狀態，所製造之第二類合板，常態膠合力；在來稻殼粉 13.4 kg/，蓬來 15.0 kg/，耐溫水膠合力：在來 14.8 kg/，蓬來 14.6 kg/。對PF 膠添加蓬來稻殼粉 7.5%者，黏度 1,200 cps，所製造之第一類合板，常態膠合力 17.4 kg/，乾濕反覆試驗之膠合力 12.8 kg/。在工廠製造合板實際操作過程，從調膠、布膠至熱壓完畢，並無任何困難發生，效果至為良好。
• 英文摘要： In the previous paper, the use of finelyground rice hull flour (passed the 100-mesh) asfiller in UF, PF, RF and PVAc adhesive wereinvestigated. The results showed that the ricehull flour was satisfactory from the viewpointof bonding strength and compared favorablywith wheat flour, but it caused unsatisfactoryresult in grinding character. UF adhesive andPF adhesive have the greatest amount of con-sumption in the domestic plywood industry,therefore in this experiment, only those twokinds of adhesives had been used, and the ricehull flour had been applied as filler. The mainpoint of this experiment was to apply previouslaboratory results in the actual plywood worksand observe the results in the industrial scale.Before the results applied in industrial scale,pretreatment of rice hull was made to observethe effect of pretreatment on the grindingcharacter, the yield of different particle sizesand bonding strength of plywood when rice hullflour was applied in the utilization as filler. 1)Dried at 105°C. 2) Extracted with hot water. 3)Extracted with 1% sodium hydroxide. Theresutls obtained from this study were summarizedas follows. 1. After at 105°C or extracted with hotwater, rice hull was easily ground but therewas no significant effect in bonding strength ofplywood when rice hull flour was used as filler.The yield of finely ground flour (passed the100-mesh) was increased about 3% when ricehull was extracted with hot water. 2. Both grinding character and bondingstrength of plywood had not been improvedwhen the rice hull was extracted with 1%sodium hydroxide. 3. The pH and viscosity of UF adhesivewhen mixed with 7.5% rice hull flour and 7.5%wheat flour and PF adhesive when mixed with7.5% rice hull flour were very suitable forspreading and no difficulty had occurred withinthe whole plywood manufacturing process. 4. Type Ⅱ plywood made from UF adhesivewhen mixed with 7.5% rice hull flour and 7.5%wheat flour used as filler showed better resultsin bonding strength. (Japonica type rice hullflour, dry test 15.0 kg/, wet test 14.6 kg/ ;Indica type rice hull flour, dry test 13.4 kg/ ,wet test 14.8 kg/). 5. Type I plywood made from PF adhesivewhen mixed with 7.5% Japonica type rice hullflour as filler showed excellent results in bondingstrength. (dry test 17.4 kg/, cycle test12.8 kg/)
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