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TAPPI Journal summaries.

Following are summaries of March 2006 peer reviewed papers from TAPPI JOURNAL, a monthly publication that includes full-text, peer reviewed research papers. TAPPI membership includes access to all TAPPI JOURNAL content online at www.tappi.org. In addition, print and electronic subscriptions are available. For more information about joining TAPPI or to subscribe to TAPPI JOURNAL, contact the TAPPI Member Connection Center: Phone: 1 800 332-8686 (USA); 1 800 446-9431 (Canada); or +1 770 446 1400 (International).

FIBER ANALYSIS

QUANTIFICATION OF SOFTWOOD, HARDWOOD, AND NONWOOD FIBER CONTENT IN PACKAGING GRADE PAPERS

By Stergios Adamopoulos

APPLICATION: Packaging grade papers incorporate a variety of wood and nonwood fiber types. Manufacturing of papers of consistent and acceptable quality requires knowledge concerning the quantity of each fiber used.

This study determined percentages by weight of the fiber components in 15 papers commonly used to produce corrugating packaging in Spain. The papers are manufactured mainly from recycled raw materials. The percentages were determined by means of standard quantitative fiber analysis techniques and use of appropriate weight factors.

Quantitative fiber composition reflects the differences in quality between the papers. Its usefulness could be further explored in the quality control of paper manufacturing for packaging.

PULPING

EVALUATION OF FOREST THINNING MATERIALS FOR TMP PRODUCTION

By John H. Klungness, Roland Gleisner, Doreen Mann, Karen L. Scallon, J.Y. Zhu, Eric G. Horn, and Louis L. Edwards

APPLICATION: The results of this study may help mills improve pulp production through better use of potentially neglected fiber resources.

We used SilviScan analysis and tracheid measurement to evaluate the effect of suppressed growth on the fundamental properties of wood fiber. Suppressed growth reduced cell tracheid length, but the high content of mature wood may translate into longer fibers overall. In pilot-scale refining experiments, blending 25% chips from small-diameter trees (SMD) with 75% mill wood chips produced slightly better quality pulp compared with pulp from a control mill wood chip sample. We conclude that suppressed growth trees are superior to normal growth trees for thermomechanical pulp production because of uniformity in cell geometry, thin cell walls, and higher content of mature wood.

BROWNSTOCK WASHING

OPERATIONAL EVALUATION OF ROTARY DRUM VACUUM FILTERS FOR BROWNSTOCK WASHING USING BASIC FILTRATION PARAMETERS

By Claudio R.F. Pacheco, Jose L. de Paiva, and Antonio S. Reynol, Jr.

APPLICATION: A computer program using these calculations will facilitate

the management of brownstock washing operations.

Process managers rely on information about operational efficiency in their daily routines. Brownstock washing is an operation that relies on accurate control of the washing fluid to conserve energy, decrease water usage, and hold down the expenditure of bleaching chemicals.

The overall goal of these researchers has been to develop a practical calculation procedure in the form of a computer program to give brownstock washing managers more information than what the instrument panel tells them and what they can learn through laboratory work. Calculations were developed for a rotary drum vacuum filter. Equations are presented, and the calculation procedure is outlined in detail.

ATOMIC FORCE MICROSCOPY

CHARACTERIZING THE PORE STRUCTURES OF PAPER COATINGS WITH SCANNING PROBE MICROSCOPY

By Sabina Di Risio and Ning Yan

APPLICATION: Atomic force microscopy can characterize the z-directional pore structure of paper coatings at a high resolution.

The coating of a paper sheet determines many of its final properties. However, there are not many methods for characterizing the structure of the coating, and traditional methods are limited in their capabilities. A new method has now been developed using an atomic force microscope. Atomic force microscopy (AFM) offers higher resolution in analyzing the spatial arrangement of coating components. Samples are prepared by ultramicrotomy, but require no labeling of the coating components.

PAPERMAKING

SUBSTITUTION OF HARDWOOD KRAFT WITH ASPEN HIGH-YIELD PULP IN LIGHTWEIGHT COATED WOOD-FREE PAPERS: PART I. SYNERGY OF BASESTOCK PROPERTIES

By Kaitang Hu, Yonghao Ni, Yajun Zhou, and Xuejun Zou

APPLICATION: Results suggest that the substitution of HBKP with aspen HYP up to 30% is technically feasible and beneficial for producing a lightweight "wood-free" basestock.

Papermakers have shown an interest in using high-yield pulps (HYP) in wood-free coated papers to reduce cost and improve product performance. HYP is essentially a chemimechanical pulp, so there are concerns about the potential effects its use might have on the coating operation and coated paper performance.

To address these concerns, we carried out a systematic investigation on the effects of substituting hardwood bleached kraft pulp (HBKP) with HYP on the properties of basestock, coated, and calendered sheets, with a focus on lightweight coated grades. The results are presented in two reports. In this first part we focus on the potential impact of HYP substitution on basestock properties.
COPYRIGHT 2006 Paper Industry Management Association
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2006, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

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Publication:Solutions - for People, Processes and Paper
Date:Mar 1, 2006
Words:772
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