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Journal articles
Open Access
The influence of pigment particle shape on the in-plane tensile strength properties of kaolin-based coating layers, TAPPI JOURNAL

The influence of pigment particle shape on the in-plane tensile strength properties of kaolin-based coating layers, TAPPI JOURNAL

Journal articles
Open Access
Influence of wet-end variables on the sizing efficiency of ASA on fine papers produced with Eucalyptus globulus kraft pulps

Influence of wet-end variables on the sizing efficiency of ASA on fine papers produced with Eucalyptus globulus kraft pulps

Journal articles
Open Access
Effects of SO2 on superheater fouling in kraft recovery boilers, TAPPI JOURNAL February 2008

Effects of SO2 on superheater fouling in kraft recovery boilers, TAPPI JOURNAL February 2008

Journal articles
Open Access
Eucalyptus kraft pulp bleaching: state-of-the-art and new developments, TAPPI JOURNAL February 2008

Eucalyptus kraft pulp bleaching: state-of-the-art and new developments, TAPPI JOURNAL February 2008

Journal articles
Open Access
Improvement of eucalyptus bleached kraft pulp effluent treatment through combined ozone-biological treatment, TAPPI JOURNAL February 2008

Improvement of eucalyptus bleached kraft pulp effluent treatment through combined ozone-biological treatment, TAPPI JOURNAL February 2008

Journal articles
Open Access
Beating-induced yellowing of tcf- and ecf-bleached pulps alexander, Solutions! & TAPPI JOURNAL, January 2004, Vol. 3(1) (124KB)

Beating-induced yellowing of tcf- and ecf-bleached pulps alexander, Solutions! & TAPPI JOURNAL, January 2004, Vol. 3(1) (124KB)

Journal articles
Open Access
OCC pulp fractionation-a comparative study of fractionated and unfractionated stock, TAPPI JOURNAL, Online Exclusive, January 2004, Vol. 3(1) (KB)

OCC pulp fractionation-a comparative study of fractionated and unfractionated stock, TAPPI JOURNAL, Online Exclusive, January 2004, Vol. 3(1) (KB)

Journal articles
Open Access
Prediction of metals distribution in mill processes, part 1: metals equilibrium model, Solutions! & TAPPI JOURNAL, January 2004, Vol. 3(1) (215KB)

Prediction of metals distribution in mill processes, part 1: metals equilibrium model, Solutions! & TAPPI JOURNAL, January 2004, Vol. 3(1) (215KB)

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.

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