共查询到19条相似文献,搜索用时 93 毫秒
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研究新闻纸在反复回用过程中纸页印刷性能的变化规律,重点探讨阳离子聚丙烯酰胺(CPAM)、阳离子淀粉(CS)、壳聚糖(CTS)对改善回用新闻纸印刷性能的效果。结果表明:新闻纸经回用后,白度、光散射系数、平滑度、不透明度、裂断长、表面强度均下降;第一次回用后下降的程度最大,其中光散射系数下降幅度为17.9%,正反面临界拉毛速度分别下降了32.8%和29.1%,裂断长下降幅度为55.5%;油墨吸收性能随回用次数的增加而提高。在本研究范围内,3种化学助剂均能改善回用新闻纸的印刷性能,其中CS用量为2%时效果最好。 相似文献
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目前,国内各大报社均采用进口高速卷筒胶印机印刷报纸,对新闻纸的表面强度要求越来越高。而我公司生产的新闻纸配有大量的机械浆,表面强度低,掉毛糊版问题一直未能得到改善,直接影响公司产品的销售。为了改善新闻纸的表面强度,针对我公司配抄新闻纸的浆料特性,进行了添加玉米变性淀粉的实验室小试,结果令人满意。1 试验11 两种玉米变性淀粉的质量指标阴离子淀粉和非离子淀粉,外观:都是白色粉末,水分≤14%,斑点≤1个/cm2,细度≥98%(100目);pH值:65~75;粘度:阴离子淀粉为14~16mPa·s(10%),非离子淀粉为≥500Bu… 相似文献
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化学助剂在新闻纸上的应用 总被引:2,自引:0,他引:2
膝州市造纸厂1四7年对原扑克牌面纸生产线进行技术改进,用“8美国废纸(30%杂志十70de报纸)脱墨处理,抄造49*2g/m2C级新闻纸.用全废纸脱墨浆抄新闻纸存在表面强度低、纸页匀度差、平滑度较低等问题,且湿部断纸多,影响生产。后来,我们成功应用了高效助留助滤剂和增强剂,不但提高了产品质量,而且纸机生产正常,取得了很好的经济效益。。。伯周阳离子淀粉,提高对问。蚊、力迫性能由于”8美国废纸浆属磨木浆,经脱墨和打浆处理后,纤维的强度受到损伤,并且再生废纸浆中细小纤维含量很高。因此,纸员成形后强度较低,尤其是表面强… 相似文献
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阳离子变性淀粉是生产新闻纸工艺中重要的湿部化学品之一。该文简述了阳离子变性淀粉的特性,并对阳离子变性淀粉的蒸煮、贮存、添加点的选择、使用效果的追踪及其应用时需注意的问题等生产实践中积累的经验作了介绍。 相似文献
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实验研究了改性阳离子瓜尔胶VF-A在ONP脱墨浆中的应用;对瓜尔胶和淀粉混合使用做了对比.结果表明:在脱墨ONP系统中,瓜尔胶VF-A可明显提高新闻纸的物理强度及表面强度,但助留助滤效果不如淀粉.当淀粉与瓜尔胶VF-A搭配使用,用量为0.3%+0.05%时,助留助滤效果与淀粉用量为0.5%时相同,而表面强度比淀粉用量为0.6%时高,采用此搭配用量,可降低生产成本. 相似文献
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从阳离子淀粉对化学浆、磨木浆的作用机理分析,阐明阳离子淀粉在磨木浆中应用成功的关键是要避开其木素等非纤维素物质的干扰。实践表明CCS-02型阳离子淀粉是提高新闻纸Z向强度、印刷适性和助留、助滤的优良助剂。 相似文献
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淀粉在造纸工业中的应用 总被引:8,自引:0,他引:8
本文叙述了天然淀粉的性能及三种改性淀粉的改性方法和应用效果。三种改性淀粉是阳离子淀粉、氧化淀粉及磷酸酯淀粉。阳离子淀粉具有增强助滤作用。氧化淀粉用作纸张的表面施胶剂可提高纸的表面强度。磷酸酯淀粉用作施胶助剂,可以提高施胶度。 相似文献
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The adsorption onto a softwood pulp of cationic modified starches with a degree of substitution (DS) ranging from 0.015 to 0.130 and native potato starch was investigated using a method based on size exclusion chromatography‐multi angle laser light scattering (SEC‐MALLS). This technique provides information about the amount and molecular composition of the adsorbed starch product such as the AP–AM‐ratio, the average MW and molar mass distribution. Factors influencing adsorption, like the electrolyte content in the suspension and the initial starch polysaccharide concentration, were investigated. Furthermore, hand sheets were made and the resulting mechanical paper strength was tested. Results were analysed statistically using analysis of variance. Representative results were discussed in detail. In general, low‐substituted cationic starch (DS 0.030) exhibited a higher degree of adsorption and resulted in high paper strength when there was a low electrolyte content in the starch–pulp‐suspension. However, high amounts of electrolytes impeded electrostatic interaction of the charged groups of the starch polysaccharides and cellulose fibre due to partial screening and therefore strongly limited adsorption. This resulted in lowered mechanical paper strength. The water quality of the suspensions had little impact on the polyelectrolyte adsorption of the highly substituted cationic starch (DS 0.100). However, paper strength was markedly higher in the case of starch adsorption where there was a high ionic content and when both starch polysaccharides–AP and AM– were adsorbed. The initial starch concentration determined starch adsorption both quantitatively and qualitatively and subsequently paper strength as well. The relation between adsorption behaviour and paper strength was discussed, particularly in the case of 6% initial starch concentration. In deionised water (DW), the low‐substituted starch (DS 0.03) adsorbed onto the pulp to a greater extent with an AP–AM‐ratio similar to that of the initial starch. Moreover, this achieved the best strength properties in contrast to 36 dGH, where less starch adsorbed and that being almost exclusively AP. In water with 36 dGH, the highly substituted starch (DS 0.100) with both the AP and AM was absorbed and this resulted in higher paper strength. In contrast, AM was almost exclusively adsorbed in DW. Increasing the initial starch concentration increased the amount adsorbed while subsequently changing the AP–AM‐ratio towards increased AM adsorption and decreased AP adsorption in the case of DS 0.100 in DW. Exclusive adsorption of AM markedly lowered the development of the paper strength. 相似文献
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从电荷分析研究两性淀粉对新闻纸撕裂度的影响 总被引:1,自引:1,他引:0
本文从电荷分析研究了两性淀粉对新闻纸撕裂度的影响,研究结果表明:两性淀粉用量对新闻纸浆的电荷密度有影响,新闻纸浆的可溶净电荷、表面阳电荷和CTR随淀粉用量的增加而增加,表面阴电荷随淀粉用量的增加而减小,在淀粉用量较低时,可溶净电荷变化比较缓慢,而纸浆表面电荷CTR的变化非常显著,用量大于0.5%后,可溶净电荷增加较快,而对CTR的影响很小,pH值对添加两性淀粉0.5%的新闻纸浆的可溶净电荷和表面阳电荷的影响不大,表面阴电荷随pH值的增加而减小,在pH值小于6时,变化的幅度较大,pH值大于6,表面阴电荷变化的趋势减小,在pH=6时,CTR达到最大,结合pH值对桉木化机浆与新闻纸浆的影响可以知道:pH=6~8时,整个浆料系统接近电中性,两性淀粉与纤维之间的相互作用达到最佳,从而使纸页的纤维间结合状态最好。 相似文献
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本文介绍一种造纸厂自制阳离子淀粉的方法。自制阳离子淀粉较市场阳离子淀粉价钱便宜。造纸厂自制阳离子淀粉可以采用连续法,也可以采用间歇法来制造。日本多采用连续法,我国可以采用间歇法,自制阳离子淀粉的质量取决于醚化剂,氢氧化钠用量,醚化温度、浓度和时间等。 相似文献