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纸张Q&A ABC
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作者 菲舟 《印刷技术》 北大核心 2003年第35期33-35,共3页
106.什么叫纸张的应力和应变? 答:应力是物质抵抗外界负荷时单位面积所受的内力.应变是物体受力后尺寸发生的变化与原有尺寸的比率.理想的弹性固体在外力作用下,其尺寸的变化与负荷大小成正比;当负荷撤除后,可恢复原来尺寸,应变也随之消除.
关键词 印刷纸张 化学浆纸 性能特点 高级非涂布纸 胶版印刷纸 轻量纸
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The Effect of Chlorine Dioxide Charges in Chlorine Dioxide-Alkaline Extraction-Chlorine Dioxide (DED) Sequence on Optical Properties of Kraft Pulp of Eucalyptus camaldulensis
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作者 Hossein Resalati Sara Kajforush Ali Ghasemian Ahmadreza Saraeyan 《Journal of Environmental Science and Engineering(A)》 2012年第2期181-186,共6页
Hardwoods are important raw material for making pulp and paper products. Eucalyptus camaldulensis is a fast-growing hardwood species with a wide distribution in Iran and can be introduced as appropriatematerial to com... Hardwoods are important raw material for making pulp and paper products. Eucalyptus camaldulensis is a fast-growing hardwood species with a wide distribution in Iran and can be introduced as appropriatematerial to compensate the wood shortages of the natural forest. Kraft pulping was performed under different cooking conditions and, based on the relations of pulp yield and kappa number, bleachable kraft pulp at screened yield of 43.3% and kappa number of 31.3 was selected for DED (Chlorine Dioxide-Alkaline Extraction-Chlorine Dioxide) bleaching and its bleachability was studied at different kappa factor in D~ stage. The results indicated that the bleachable kraft pulp from this species has high kappa number at acceptable screened yield and to complete the delignification in the bleaching process, higher kappa factor may be needed in DED bleaching sequence. The main reduction in final kappa number and yield loss were observed at kappa factor level of 0.2 but by further increase in kappa factor up to 0.4, more development were observed in optical properties but at lower opacity. 展开更多
关键词 KRAFT Kappa factor Eucalyptus camaldulensis DED bleaching.
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