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Journal articles
Open Access
Rapid caustic extraction of chlorinated pulp, TAPPI JOURNAL March 1988

Rapid caustic extraction of chlorinated pulp, TAPPI JOURNAL March 1988

Journal articles
Open Access
Computer-assisted ultrasonic detection and measurement of cracks in pressure vessels, TAPPI JOURNAL March 1988

Computer-assisted ultrasonic detection and measurement of cracks in pressure vessels, TAPPI JOURNAL March 1988

Journal articles
Open Access
Corrosion fatigue testing of suction roll alloys, TAPPI JOURNAL March 1988

Corrosion fatigue testing of suction roll alloys, TAPPI JOURNAL March 1988

Journal articles
Open Access
The design of aboveground fiberglass-reinforced piping systems, TAPPI JOURNAL March 1988

The design of aboveground fiberglass-reinforced piping systems, TAPPI JOURNAL March 1988

Journal articles
Open Access
Upgrading the combustion system of a 1956-vintage recovery steam generator, TAPPI JOURNAL March 1988

Upgrading the combustion system of a 1956-vintage recovery steam generator, TAPPI JOURNAL March 1988

Journal articles
Open Access
Automated control of washer shower water at ITT Rayonier, TAPPI JOURNAL March 1988

Automated control of washer shower water at ITT Rayonier, TAPPI JOURNAL March 1988

Journal articles
Open Access
Improving TMP pulp properites by sulfonation: optimization of sulfonation process alternatives, TAPPI JOURNAL October 1988 88OCT123

Improving TMP pulp properites by sulfonation: optimization of sulfonation process alternatives, TAPPI JOURNAL October 1988

Journal articles
Magazine articles
Open Access
Compression refining: the future of refining? Application to Nordic bleached softwood kraft pulp, TAPPI Journal August 2024

ABSTRACT: A new compression refining technology based on the kneading of high consistency pulp has been selected and tested in various conditions with a model Nordic bleached softwood kraft (NBSK) pulp. The method uses a kneader mixer referred to as the ultra continuous mixer (UCM) to condition the pulp. Its performance levels were also compared with those obtained with traditional low consistency (LC) refining of the same pulp.Compression refining of the NBSK pulp with the UCM led to a much better °SR/strength compromise than conventional LC refining. High strength properties can also be achieved by compression refining, in a range similar to/or better than LC refining. The higher the strength required, the greater the advantages of this technology: for a given strength, a difference of up to 10°SR can be obtained as compared to LC refined pulp. Moreover, a higher tear index can be obtained with compression refining, since fiber cutting is greatly reduced.The lower °SR is due to the release of fewer cellulosic fines, which also results in the manufacturing of new papers combining a high strength and a high permeability that cannot be obtained with traditional LC refining. Indeed, with LC refining, a high strength is generally associated with a low permeability. Upscaling this technology seems to be possible since large production devices are already on the market for applications other than paper/pulp. With this new pulp behavior, papermakers will have to learn to think differently, as paper strength and °SR can now be decorrelated.

Journal articles
Magazine articles
Open Access
Dynamic out-of-plane compression of paperboard — Influence of impact velocity on the surface, TAPPI Journal February 2024

ABSTRACT: Processes that convert paperboard into finished products include, for example, printing, where the paperboard is subjected to rapid Z-directional (ZD) compression in the print nip. However, measuring and evaluating the relevant properties in the thickness direction of paperboard are not necessarily straightforward or easy. Measuring at relevant, millisecond deformation rates further complicates the problem. The aim of the present work is to elucidate some of the influences on the compressive stiffness. Both the initial material response and the overall compressibility of the paperboard is studied. In this project, the effect on the material response from the surface structure and the millisecond timescale recovery is explored.The method utilized is a machine called the Rapid ZD-tester. The device drops a probe in freefall on the substrate and records the probe position, thus acquiring the deformation of the substrate. The probe is also allowed to bounce several times on the surface for consecutive impacts before being lifted for the next drop. To investigate the time dependent stiffness behavior, the probe is dropped several times at the same XY position on the paperboard from different heights, thus achieving different impact velocities. The material response from drops and bounces combined allows study of the short-term recovery of the material. The material in the study is commercial paperboard. The paperboard samples are compared to material where the surface has been smoothed by grinding it. Our study shows that there is a non-permanent reduction in thickness and a stiffening per bounce of the probe, indicating a compaction that has not recovered in the millisecond timescale. Additionally, a higher impact velocity has an initial stiffening effect on the paperboard, and this is reduced by smoothing the surface.

Journal articles
Magazine articles
Open Access
Editorial: TAPPI Journal Best Research Paper for 2023 focuses on black liquor concentration using graphene oxide membranes, TAPPI Journal February 2024

ABSTRACT: TAPPI and the TAPPI Journal (TJ) Editorial Board would like congratulate the authors of the 2023 TAPPI Journal Best Research Paper Award and Honghi Tran Prize: Sam Rae, Ella V. Richards, Max Kleiman-Lynch, Brent D. Keller, and Brandon I. Macdonald. Their paper, “Pilot scale black liquor concentration using pressure driven membrane separation,” appeared on p. 223 of the April 2023 issue. This kraft recovery cycle research was recognized by the TAPPI Journal Editorial Board for its innovation, creativity, scientific merit, and clear expression of ideas.

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