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題名 | 紅檜、扁柏、鐵杉不同部位樹材之蘇打蒽醌法製漿性研究= |
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作者 | 汪淮; 林蘭東; |
期刊 | 林產工業 |
出版日期 | 19881200 |
卷期 | 7:4 1988.12[民77.12] |
頁次 | 頁27-41 |
分類號 | 476.22 |
語文 | chi |
關鍵詞 | 法; 扁柏; 紅檜; 製漿; 樹材; 蘇打; 鐵杉; |
中文摘要 | 本實驗是探討蒽醌添加劑在碱性無硫製漿法中對台灣針葉樹材之較適添加量,以及添加蒽醌後所需之用職量;並在設定一共同蒸解條件下探討蘇打蒽醌法對台灣三種針葉樹-鐵杉、紅檜、扁柏因樹種和部位不同之變異性比較。實驗結果如下:(1)本法之製漿結果顯示以27%之用碱量及0.10%以上之蒽醌添加量較恰當。(2)蒽醌添加量(Ao)與殘留紙漿中之木質素含量(L)似乎呈下列關係式:1/L□Ao^(1/2),而蒽醌之添加之所以會增加收率乃因對殘渣有促進解纖之作用,當用碱量、溫度、時間等原製漿因子足夠使殘渣量減至最低時,蒽棍之添加對收率並無增加之效應,且可能反而減少收率。(3)然就同一卡巴值水準而言,蒽醌之添加可減少用碱量或增加收率,因此可減少碱性用藥量並降低污染。(4)三種樹種之收率在四段樹高上皆一致呈現邊皮材(A)>心材(B)>近髓材(C)之趨勢,在各水平位置上亦大致呈現近根株部(S)>1/4樹高(1H)、1/2樹高(2H)>3/4樹高(3H)之情形(只鐵杉心材部位為例外);三種樹種之卡巴值只紅檜呈現規則性,于各樹高部位上呈A≥ B>C之勢,水平位置上呈S > 3H之勢,扁柏規則性稍差,約呈A≥ C及3H > 2H = 1H > S之勢,鐵杉較無規則性,約只呈C> A或B之趨勢。(5)製漿效益(收率/卡巴值):以鐵杉較紅檜好一些,扁柏因3/4樹高部位之樹脂含量偏高影響了去木質素效率,其平均製漿效益比值稍低。(6)本製漿法之白度及撕力強度可媲美硫酸鹽法;三樹種之紙力性質為:耐摺力2638次,破裂比60.3,撕力比105.4-194.4,裂斷長5.0-7.8km,白度23.8%GE,平均收率(44.3%)比硫酸鹽法者(42.9%)高1.4%,但內含殘留木質素量較高。 |
英文摘要 | The purpose of this study is to investigate the optimum charges if alkaline and AQ in the alkaline-nonsuifur pulping of. Taiwan sοftwoods; the variabilities of soda-AQ pulping due to tree species and position factors were also studied. a tree stem. The experimental results are summarized as follows: 1. The data of this pulping process show that the optimum active alkali charge is 27% while that of AQ is over 0.10%. 2. We once again confirm the relationship between AQ charge (Ao) and residual lignin in pulp (L) as follows: I/L Ao^(1/2), but there is no direct linkage between AQ charge and pulp yield. 3. When comparison is made at the same kappa level, the advantages of adding AQ to the cooking liquors are to increase yield & decrease alkali charge, in the latter case, the production cost and pollution problem can be reduced. 4. Pulp yields of the three species at each vertica position of stems all show the same tendency [Near-bark (A) > between (B) near- pith (C)]; and at each horizontal position of stems shows [Nearstump (S) > 1/4 height (1H), 2/4 height (2H) > 3/4 height (3H) ] tendency. 5. Tsuga chinensis gives a little better pulping effectiveness than chamascyparis formosensis, and because at the 3/4 height chamaecyparis obtusr var. formosana has a quite high resin content which interferes the removal of lignin, C. obtusa gives the worst pulping effectiveness of the three species. 6. The brightness and tear fator of this process are' comparable to those of kraft process. The average paper propertiesof three species are: 2638 counts for MIT foldings, 60.3 for burst factor , 160.6 for tear factor, 7.4 km for breaking length and 23.8% GE for brightness. The average yield (44.3%) is 1.4% higher than that of kraft process, under the same brightness, but also contains .a higher residual lignin content in pulp. |
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