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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
Real-time monitoring of bubble size distribution in a foam forming process, TAPPI JOURNAL August 2019
ABSTRACT: Foam forming is an intricate option to lessen fiber flocculation and to get better energy and water efficiency when making fiber-based products. Developed during the 1970s, this approach has recently received renewed attention, mainly because it also offers possibilities to widen the fiber-based product portfolios with novel and more valuable products. In addition to air content, bubble size is the most important property of foam. Foam quality control is essential for building real-world foam forming processes. In this work, we show how bubble size can be monitored with direct optical imaging in real time in real process conditions, and how such analysis helps adjust foam quality and discover process faults in foam forming.
Journal articles
Paper machine white water deaeration and two-stage flotation with channel flow, TAPPI JOURNAL July 2012
Paper machine white water deaeration and two-stage flotation with channel flow, TAPPI JOURNAL July 2012
Journal articles
Conference review: Recycling sessions at TAPPI PEERS, TAPPI JOURNAL February 2012
Conference review: Recycling sessions at TAPPI PEERS, TAPPI JOURNAL February 2012
Journal articles
Vibration analysis applied to low-speed machines in the pulp and paper industry, TAPPI JOURNAL, May 2002, Vol. 1(3) (406KB)
Vibration analysis applied to low-speed machines in the pulp and paper industry, TAPPI JOURNAL, May 2002, Vol. 1(3) (406KB)
Journal articles
Optimization of Rectangular Pulp Stock Mixing Chest Dimensions Using Dynamic Tests, TAPPI JOURNAL, February 2007
Optimization of Rectangular Pulp Stock Mixing Chest Dimensions Using Dynamic Tests, TAPPI JOURNAL, February 2007
Journal articles
Determination of drainage resistance coefficients under known shear rate, TAPPI JOURNAL, August 2002 (268KB)
Determination of drainage resistance coefficients under known shear rate, Solutions! & TAPPI JOURNAL, August 2002 (268KB)
Journal articles
Impact of the cluster rule on the cost competitiveness of the u.s. papermaking industry in the global market, TAPPI JOURNAL, September 2000, Vol. 83(9)
Impact of the cluster rule on the cost competitiveness of the u.s. papermaking industry in the global market, TAPPI JOURNAL, September 2000, Vol. 83(9)
Journal articles
The Effect of the Asian Crisis on Global Paper Markets, TAPPI JOURNAL, January 1999, Vol. 83(5)
The Effect of the Asian Crisis on Global Paper Markets, TAPPI JOURNAL, January 1999, Vol. 83(5)
Journal articles
IP, g-p, and weyerhaeuser plan e-marketplace, TAPPI JOURNAL, August 2000, Vol. 83(8)
IP, g-p, and weyerhaeuser plan e-marketplace, TAPPI JOURNAL, August 2000, Vol. 83(8)
