Effects of fiber morphological characteristics and refining on handsheet properties.

Q4 Agricultural and Biological Sciences
Perng Yuan-Shing, Wang IChen, Chen Yinli, Chen Yuchun
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引用次数: 5

Abstract

Under a fixed wet end chemical additive regime, pulp fibers of different morphological characteristics, including 2 softwood pulps of northern softwood and radiata pine, and 3 hardwood pulps of eucalyptus, mixed Indonesian hardwoods, and acacia underwent different degrees of pulp refining and then were used individually or as a blend (1 softwood to 1 hardwood pulp) to form handsheets. The handsheet bulk, water absorption, air permeability, and dry and wet opacities properties were then compared and correlated to the fiber morphological indicators such as fiber length, coarseness, and population in order to provide a reference for furnish blending to make specialty papers and other applications. The experiment on the individual pulp fibers indicated that along with increasing degrees of refining, the fiber population increased proportionally, pulp freeness and fiber lengths changed in an inverse manner, while fiber coarseness changed irregularly. The blended furnishes, on the other hand, indicated that along with increases in the hardwood pulp proportions, the freeness, fiber lengths, and coarseness changed in an inverse trend, whereas the fiber population also increased. Thus, it is feasible to use refining and blending of softwood and hardwood pulps to adjust the stock that meets the required freeness and fiber morphological properties for paper machines. Analysis of handsheets formed from individual pulps indicated that paper bulk and both dry and wet opacities decreased with an increased degree of pulp refining and were negatively correlated. Water absorption, and air permeability, on the other hand, increased with increasing pulp refining and exhibited positive correlations. The bulk and opacity of the hardwood pulps were higher than those of the softwood pulps, whereas the water absorption and air permeability values were higher than those of the hardwood pulps. The blended furnish study indicated that along with increasing hardwood pulp proportions, the paper bulk of Indonesian hardwoods pulp containing furnishes increased proportionally, while those of eucalyptus and acacia pulps containing furnishes showed negative correlations. Water absorption and air permeability values were negatively correlated to the hardwood pulp proportions, whereas opacities showed positive correlations. In addition, paper bulk and water absorption were positively correlated with the fiber coarseness (except for the Indonesian hardwoods), Relationships between the paper air permeability value and fiber coarseness and populations were furnish-dependent; while there was a positive correlation between paper opacities and fiber populations (except for the Indonesian hardwoods). There was a linear correlation between the pulp blend ratio and handsheet opacity. Hence, the opacity of a blended paper was derived from the opacities of the individual softwood and hardwood fibers.
纤维形态特征及精制对手纸性能的影响。
在固定的湿端化学添加剂体系下,对不同形态特征的纸浆纤维进行不同程度的纸浆精炼,分别使用2种北方针叶松针叶木纸浆和3种桉树、混合印尼硬木和金合欢硬木纸浆,然后单独或混合使用(1种针叶木与1种硬木纸浆)制成手纸。将手纸的体积、吸水率、透气性、干湿混浊性能与纤维长度、粗度、密度等纤维形态指标进行比较,并与之进行相关性分析,为特种纸的配料配制及其他应用提供参考。对单个纸浆纤维的实验表明,随着精炼程度的增加,纤维数量成比例增加,纸浆游离度和纤维长度呈反比变化,纤维粗度呈不规则变化。结果表明,随着硬木浆掺量的增加,松散度、纤维长度和粗度呈反比变化,纤维密度增加。因此,利用软、硬木纸浆的精制和混炼来调整浆料,使其满足造纸机所需的游离度和纤维形态性能是可行的。对单个纸浆形成的手纸的分析表明,纸浆精炼程度的增加,纸的体积和干、湿不透明度都降低,并呈负相关。吸水率和透气性随纸浆精炼程度的增加而增加,并呈正相关关系。硬木浆的体积和不透明度均高于软木浆,吸水率和透气性均高于硬木浆。混合配料研究表明,随着硬木纸浆掺量的增加,印尼硬木纸浆的纸张体积呈比例增加,而桉树和金合欢纸浆的纸张体积呈负相关。吸水率和透气性与硬木浆比例呈负相关,浑浊度与硬木浆比例呈正相关。此外,纸张体积和吸水率与纤维粗度呈正相关(印尼硬木除外),纸张透气性值与纤维粗度和种群之间的关系具有供给依赖性;而纸张不透明度与纤维数量呈正相关(印尼硬木除外)。纸浆混合比与手纸不透明度呈线性相关。因此,混合纸的不透明度来源于单个软木和硬木纤维的不透明度。
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来源期刊
Taiwan Journal of Forest Science
Taiwan Journal of Forest Science Agricultural and Biological Sciences-Forestry
CiteScore
0.20
自引率
0.00%
发文量
0
期刊介绍: The Taiwan Journal of Forest Science is an academic publication that welcomes contributions from around the world. The journal covers all aspects of forest research, both basic and applied, including Forest Biology and Ecology (tree breeding, silviculture, soils, etc.), Forest Management (watershed management, forest pests and diseases, forest fire, wildlife, recreation, etc.), Biotechnology, and Wood Science. Manuscripts acceptable to the journal include (1) research papers, (2) research notes, (3) review articles, and (4) monographs. A research note differs from a research paper in its scope which is less-comprehensive, yet it contains important information. In other words, a research note offers an innovative perspective or new discovery which is worthy of early disclosure.
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