Weighted Average Fiber Length: An Important Parameter in Papermaking

重量平均纖維長度：製漿造紙中的一個重要參數

Vipul Singh Chauhan ； Nitin Kumar ； Manoj Kumar ； S. K. Thapar

《台灣林業科學》 28卷2期 (2013/06) Pp. 51-65

https://doi.org/10.7075/TJFS.201306_28(2).0001

摘要

平均纖維長度分別為2530及1688 μm之長纖維針葉樹漿與竹漿，分別與平均纖維長度為696 μm之桉樹漿予以混抄，其主要目標為使混抄漿料之重量平均纖維長度(WAFL)與平均纖維長度為990 μm之相思樹漿相似。所得各組漿料施以不同PFI轉數予以精鍊，並抄製成紙，同時檢測並比較打漿性、紙漿濾水性及紙張性質（嵩度、抗張強度、破裂強度、撕裂指數、耐摺力、Scott內部結合強度、透氣度及交織性質等）。混抄之桉樹漿，對於精鍊時之能源需求或是紙漿濾水速率均無任何影響，顯示重量平均纖維長度對此二性質無影響。紙漿中原有纖維長度對於紙張性質影響較重量平均纖維長度為大。相同打漿度下，相思樹漿較桉樹漿強度為低。而在撕裂指數方面，相思樹漿較桉樹漿為佳。再者，將桉樹漿分別混抄針葉樹漿及竹漿，二者所得之撕裂指數較相思樹漿為佳，顯示重量平均纖維長度會影響紙張之撕裂指數。且於游離度500 mL CSF時，桉樹漿分別混抄竹漿及針葉樹漿，則所得之撕裂指數較相思樹漿多3及20%。

關鍵字

竹類 ； 闊葉樹 ； 紙張性質 ； 精鍊 ； 針葉樹 ； 重量平均纖維長度

並列摘要

Long-fibered softwood and bamboo pulps with respective average fiber lengths of 2530 and 1688 μm were blended with eucalyptus pulp of 696 μm in average fiber length. The target was to obtain a weighted average fiber length (WAFL) of the blends similar to acacia pulp at 990 μm average fiber length. All pulps were refined with different PFI mill revolutions, and handsheets were produced. The refining behavior, drainage of pulp, and various paper properties (bulk, tensile strength, burst strength, tear index, double fold, Scott bond, air permeability, and formation) were determined and compared. The WAFL had no effect on the refining energy demand or drainage rate of the blended eucalyptus pulp. The intrinsic fiber length of the pulp furnish had greater effects on the paper properties than did the WAFL. Acacia pulp provided lower paper strength compared to eucalyptus pulp at the same refining level. The tear index was higher with acacia than eucalyptus pulp, and after blending with softwood and bamboo, eucalyptus provided a greater tear index than did acacia, which illustrates the effect of the WAFL on the tear index of paper. At 500 mL CSF, respective increases in the tear index of paper made from eucalyptus pulp blended with softwood and bamboo pulps were 3 and 20% compared to that of acacia pulp.

並列關鍵字

bamboo ； hardwood ； paper properties ； refining ； softwood ； weighted average fiber length