桉木冷碱浸渍-挤压-硫酸盐法制浆的研究

发布时间：2018-03-20 18:03

  本文选题：桉木　切入点：硫酸盐法制浆　出处：《中国造纸学报》2016年03期 　论文类型：期刊论文

【摘要】：将冷碱浸渍-挤压作为木片预处理方法,并应用于桉木硫酸盐法制浆的前段。探讨了冷碱浸渍-挤压的最佳工艺条件,研究了蒸煮工艺条件对预处理后料片蒸煮结果的影响,对比了未预处理原料与预处理后料片硫酸盐法蒸煮所得纸浆的强度性能。结果表明,木片经过冷碱浸渍-挤压后,易于蒸煮,从而可减少蒸煮用碱量或降低最高蒸煮温度、缩短保温时间,且蒸煮的均匀性得到改善,筛渣率降低、纸浆强度性能提高。最佳预处理工艺条件为浸渍用碱量2%,浸渍时间2 h,温度25℃,液比1∶5,挤压压缩比3∶1;与未预处理原料硫酸盐法蒸煮(用碱量21%)相比,预处理后料片在总用碱量(浸渍用碱量2%,蒸煮用碱量19%)相同的情况下,成浆卡伯值降低了1.7,细浆得率只降低0.14个百分点,且纸浆强度性能更优,其中,抗张指数、耐破指数、耐折度分别提高了7.0%、5.2%、66%,撕裂指数与未预处理原料硫酸盐法蒸煮所得纸浆相近。
[Abstract]:The cold alkali impregnation and extrusion was used as the pretreatment method of wood chips, and applied to the former stage of eucalyptus pulping with Kraft process. The optimum technological conditions of cold alkali impregnation and extrusion were discussed, and the effect of cooking conditions on the cooking results of the samples after pretreatment was studied. The strength properties of the pulp prepared by untreated raw material and pretreated sheet sulfate cooking were compared. The results showed that the wood chips were easy to cook after cold alkali impregnation and extrusion, thus reducing the amount of alkali used in cooking or lowering the maximum cooking temperature. The soaking time is shortened, the uniformity of cooking is improved, the sieving rate is reduced, and the strength of pulp is improved. The optimum pretreatment conditions are as follows: alkali content 2, soaking time 2 h, temperature 25 鈩，

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