公告日期 : 2013-08-23
Weighted Average Fiber Length: An Important Parameter in Papermaking
Authors：Vipul Singh Chauhan, Nitin Kumar, Manoj Kumar, S. K. Thapar
Key words：bamboo, hardwood, paper properties, refining, softwood, weighted average fiber length.
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.