Abstract
Refining of pulp is an important stage on papermaking process in developing the fiber properties in order to meet the paper quality requirements. Separate refining is general practice implemented by industry which uses more than one kind of pulp. However, combined or mixed refining of two kinds of pulp has an advantageous especially in the view of energy. Mixed refining of BCTMP (Bleached Chemi-Thermo-Mechanical Pulp) and LBKP (Leaf Bleached Kraft Pulp) mixture has been investigated. The experiments were carried out at a mixture composition of 10% BCTMP and 90% LBKP compared to the same mixture composition of pulps which were refined separately, as well as 100% BCTMP and 100% LBKP. The result showed that the average fiber length of pulps mixture from mixed refining was the lowest, but its’ maximum fiber length was still quite good, closed to LBKP fibers. Compared to separate refining, mixed refining of pulps produced good sheet strength, while the other sheet properties were not significantly influenced. Keywords: BCTMP, LBKP, refining, mixed refining DOI : 10.7176/CMR/11-8-04 Publication date :October 31 st 2019
Highlights
Wood-free fine papers are generally made from a mixture of short fibers of Leaf Bleached Kraft Pulp (LBKP) and long fibers of Needle Bleached Kraft Pulp (NBKP) with certain compositions
This paper describes a laboratory scale combined-refining trial of a mixture of 10% BCTMP and 90% LBKP, compared to separate refining of the same mixture composition
While the minimum fiber length was almost similar to a mixture of 10% BCTMP and 90% LBKP, both www.iiste.org separate refining (L3) and combined refining (L-4)
Summary
Wood-free fine papers are generally made from a mixture of short fibers of Leaf Bleached Kraft Pulp (LBKP) and long fibers of Needle Bleached Kraft Pulp (NBKP) with certain compositions. Low brightness BCTMP is generally utilized to substitute short wood fibers in part for tissue papers manufacturing, while the high brightness BCTMP is utilized for fine writing and printing papers, both coated and uncoated (http://www.paperonweb.com/ gradepl.htm). Simultaneous refining of two or more different type of pulps is called mixed refining (Luminianen, 1998) This needs to be considered carefully, especially in terms of type of pulp used and the expected of final fiber properties. Mixed-refining increased the surface smoothness and strength of sheet, and did not significantly influence the opacity and light scattering properties of the sheet (Gao et al, 2009). The most beneficial thing of mixed-refining is that it is more energy-efficient process; while the separate refining facilitates an optimum fiber development so that produce sheets with higher strength
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