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Understanding extensibility of paper: Role of fiber elongation and fiber bonding, TAPPI Journal March 2020
ABSTRACT: The tensile tests of individual bleached softwood kraft pulp fibers and sheets, as well as the micro-mechanical simulation of the fiber network, suggest that only a part of the elongation potential of individual fibers is utilized in the elongation of the sheet. The stress-strain curves of two actual individual pulp fibers and one mimicked classic stress-strain behavior of fiber were applied to a micromechanical simulation of random fiber networks. Both the experimental results and the micromechanical simulations indicated that fiber bonding has an important role not only in determining the strength but also the elongation of fiber networks. Additionally, the results indicate that the shape of the stress-strain curve of individual pulp fibers may have a significant influence on the shape of the stress-strain curve of a paper sheet. A large increase in elongation and strength of paper can be reached only by strengthening fiber-fiber bonding, as demonstrated by the experimental handsheets containing starch and cellulose microfibrils and by the micromechanical simulations. The key conclusion related to this investigation was that simulated uniform inter-fiber bond strength does not influence the shape of the stress-strain curve of the fiber network until the bonds fail, whereas the number of bonds has an influence on the activation of the fiber network and on the shape of the whole stress-strain curve.
Journal articles
Magazine articles
Editorial: TAPPI Journal 2019 Best Research Paper addresses hard scale formation in green liquor pipelines, TAPPI Journal March 2020
ABSTRACT: TAPPI and the TAPPI Journal (TJ) Editorial Board would like congratulate the authors of the 2019 TAPPI Journal Best Research Paper Award: Alisha Giglio, Vladimiros Papangelakis, and Honghi Tran. Their paper, “The solubility of calcium carbonate in green liquor handling systems,” appeared on p. 595 of the October 2019 issue. This kraft recovery cycle research was recognized by the TJ Editorial Board for its innovation, creativity, scientific merit, and clear expression of ideas.
Journal articles
Magazine articles
Improved deinking and stickies removal
Improved deinking and stickies removal, TAPPI JOURNAL November 2017
Use of enzymes for reduction in refining energy - laboratory
ABSTRACT: We performed laboratory and process-scale studies with mixtures of cellulase and hemicellulase enzymes for reducing the refining/beating energy requirement of different types of pulp. Those included hardwood kraft pulp, long fiber fraction of bamboo pulp, old corrugated containers (OCC), and mixed pulp containing new double-lined kraft cuttings (NDLKC) and long fiber fraction of bamboo pulp. In the laboratory, the refining energies were reduced by 18%-45% for different pulps with these enzymes. The strength properties of pulps were not affected by enzyme treatment. In the process-scale trials, use of one of the enzyme products in the production of high strength extensible sack kraft paper (ESKP) reduced the required refining energy by 25 kWh/metric ton of pulp. It also yielded savIngs in steam consumption per ton of paper of about 20% from various sections of the machine operation. The mill was able to bypass one double disc refiner (DDR) when the furnish was changed to 60%unbleached bamboo kraft pulp (long fraction) and 40% NDLKC for producing normal ESKP. This reduced the energy requirement by about 54 kWh/metric ton of pulp, with an 8% savings in steam consumption per ton of paper. The mill was able to produce high strength paper having high porosity without sacrificing other strength properties. Trials with the same enzyme in a mill producing mainly coated white paper showed a reduction in refining energy of about 70 kWh/metric ton of softwood pulp and 30 kWh/metric ton of hardwood pulp. Steam consumption on the paper machine was reduced by approximately 0.5 ton steam/metric ton of paper. By using enzymes, the mill eliminated a refining bottleneck in its softwood line and increased production by 12%. The strength properties of the pulps were not affected. In a mill producing heavy base papers, enzyme use enabled the mill to bypass one 180 kW triple disc refiner (TDR). Pulp strength and other properties were within the specified limits and comparable to those of the control. All these mills have started using enzyme on regular basis.
Journal articles
Extended usage of xylanase enzyme to enhance the bleaching of softwood kraft pulp, TAPPI JOURNAL, January 2006
Extended usage of xylanase enzyme to enhance the bleaching of softwood kraft pulp, TAPPI JOURNAL, January 2006, Vol. 5(1) (164 KB)
Presentation of a dry black liquor gasification process with direct causticization
Quantification of Softwood, Hardwood, and Nonwood Fiber
Mill-scale implementation of Papricanâ??s process for polysulfide liquor production in kraft mill causticizers, Part 1:Batch trials and process optimization, 2002 Kraft Pulp Yield Symposium
Mill-scale implementation of Paprican’s process for polysulfide liquor production in kraft mill causticizers, Part 1:Batch trials and process optimization, 2002 Kraft Pulp Yield Symposium
Dynamic modeling of kraft pulpingof southern pine based on on-lineliquor analysis, 2002 Kraft Pulp Yield Symposium
Dynamic modeling of kraft pulpingof southern pine based on on-lineliquor analysis, 2002 Kraft Pulp Yield Symposium
Optimizing the control of a batch digester house with an integrated sitributed control system, 2002 Kraft Pulp Yield Symposium
Optimizing the control of a batch digester house with an integrated sitributed control system, 2002 Kraft Pulp Yield Symposium
METHODS TO MEASURE PULP YIELD IN INDUSTRIAL COOKING SYSTEMS, 2002 Kraft Pulp Yield Symposium
METHODS TO MEASURE PULP YIELD IN INDUSTRIAL COOKING SYSTEMS, 2002 Kraft Pulp Yield Symposium