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Size of fiber
Mean averages of size fiber of Thai rice straw were shown in Table 1. The length, width, lumen diametwr, cell wall thickness of fiber were respectively 0.7018, 0.0103, 0.0034, 0.0035 millimeter, with Runkel ratio, flexibility coefficient, slenderness ratio, percentage of wall fraction about 2.04, 0.33, 67.92, 32.90, respectively. It was estimated pulp properties with Runkel ratio more than 1 would be harder in tension for fiber and less oriented fiber to make paper into fluffiness (Casey,1980), with flexibility coefficient less than 0.5, the paper had medium tensile strength, burst strength and folding endurance, with slenderness ratio no less than 75 that be the paper of medium tearing strength but suitable beating with per cent of wall fraction less than 40 per cent would be good paper (Rydholm, 1967) while fibers completely oriented to get higher tensile and burst strength. However physical properties of rice straw pulp were tested to investigate an initial. Chemical composition of raw material
The chemical composition of Thai rice straw was shown in Table 2. It contained the solubility of alcohol-benzene , alcohol, hot water, and ash, lignin, holocellulose, pentosan about 6.26, 2.40, 10.08, 14.55, 17.50, 58.63, 20.34 per cent on ovendried weight basis. Extractive content was determined and it was discovered the same as the US and Sri Lanka rice straw (Misra, 1987). Ask, lignin, pentosan was the same amount as the Japanese rice straw (Chen et al., 1994). However holocellulose content was less than 10 per cent on the ovendried weight.
Pulp yield production
By means of soaking method the rice straw was initially soaked in 1 per cent of sodium hydroxide solution at 10:1 liquor to straw ratio for 45 Celsius and lignin in rice straw was activated by oxidizing the next step. This method was considered that it was convenient , to reduce chemical substance in appropriated condition that is suitable for our climate and tradition. Besides pulp yield by Chen et al., (1994) was high. The 36 cooking conditions were mentioned in part of added chemical substance, maximum temperature and time above. The concoctions were cooked and analyzed for the kappa number and lignin content. That was shown in Table 3 and in Figures 1, 2, 3, 4, and 5. It was found that the accepted yield in the condition with temperature 120 Celsius, added sodium hydroxide 5 per cent of ovendried raw material for 60 minutes (120-5-60) was the highest about 50.59 per cen of ovendried raw material and with 100-3-0 was the lowest about 14.53 per cent of ovendried raw material.
参考答案:光纤尺寸大小等于平均纤维泰国稻草被见表1. 长度、宽度、diametwr管腔,壁厚纤维细胞分别0.7018、0.0103、0.0034、0.0035毫米, 同壁比例,灵活系数,细比、墙体所占分数约为2.04、0.33、67.92、32.90元. 牙髓腔的财产据估计超过1比率将难以在紧张、纤维少 使纸纤维成蓬松型(初期,凯西)、弹性系数低于0.5, 该报中等抗拉强度、爆裂强度和耐折、 与细比不少于75文件中被撕裂,但适当强度击打元 墙上分数占不到40%将好的文件(rydholm, 1967)而获得较高的完全纤维拉伸强度和爆裂. 不过稻草纸浆物理性能检测,初步探讨. 化工原料的化学组成成分是泰籍稻草表2. 它包含溶解度醇苯、酒精、热水、灰、木质素、纤维素、戊约6.26、2.40、10.08、 14.55、17.50、58.63、20.34ovendried体重百分之基础. 采掘含量和发现相同,美国和斯里兰卡稻草(采用Misra,1987). 问木质素、戊是同一数额为100稻草(陈等. 1994). 然而纤维素含量小于10%的ovendried体重. 纸浆产量的生产方式方法浸泡稻草最初浸泡1%钠 氢氧化物溶液秸秆比例为10:145度酒和木质素稻草被激活氧化剂 下一步. 这被认为是简便方法, 减少化学物质核拨适合我国气候条件和传统. 除了陈纸浆产量等. (1994)高. 36烹饪条件所提部分补充化学成分、最高温度和时间段. concoctions熟的人,分析了卡伯和木质素含量. 这就是表3、数字1、2、3、4、5. 结果发现,在接受产量120摄氏温度条件, 补充氢氧化钠5%ovendried原料为60分钟(120-5-60)最高约50.59元 岑的原材料和100-3-0ovendried最低大约是百分之十四点ovendried原料.