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Journal articles
Open Access
Reduction in pitch adherence of paper machine clothing, TAPPI JOURNAL, November 1999, Vol. 82(11)

Reduction in pitch adherence of paper machine clothing, TAPPI JOURNAL, November 1999, Vol. 82(11)

Journal articles
Open Access
The limits of pressing, TAPPI JOURNAL, November 1999, Vol. 82(11)

The limits of pressing, TAPPI JOURNAL, November 1999, Vol. 82(11)

Journal articles
Open Access
ISO brightness - a more complete definition, TAPPI JOURNAL, October 1999, Vol. 82(10)

ISO brightness - a more complete definition, TAPPI JOURNAL, October 1999, Vol. 82(10)

Journal articles
Open Access
Wet-end charge measurement using streaming current online titrators, TAPPI JOURNAL, October 1999, Vol. 82(10)

Wet-end charge measurement using streaming current online titrators, TAPPI JOURNAL, October 1999, Vol. 82(10)

Journal articles
Open Access
On the 'cutting edge', TAPPI JOURNAL, October 1999, Vol. 82(10)

On the 'cutting edge', TAPPI JOURNAL, October 1999, Vol. 82(10)

Journal articles
Open Access
Factors influencing the treatment of paper with fluorochemicals for oil repellency, TAPPI JOURNAL, September 1999, Vol. 82(9)

Factors influencing the treatment of paper with fluorochemicals for oil repellency, TAPPI JOURNAL, September 1999, Vol. 82(9)

Journal articles
Open Access
The top six forces shaping electrical distribution and management in the pulp and paper Industry, TAPPI JOURNAL, September 1999, Vol. 82(9)

The top six forces shaping electrical distribution and management in the pulp and paper Industry, TAPPI JOURNAL, September 1999, Vol. 82(9)

Journal articles
Open Access
Bed cooling following an esp, TAPPI JOURNAL, September 1999, Vol. 82(9)

Bed cooling following an esp, TAPPI JOURNAL, September 1999, Vol. 82(9)

Journal articles
Magazine articles
Open Access
Editorial: New coating grades require new tests: Barrier performance inside the package, TAPPI Journal November 2024

The TAPPI Journal special Coating issue is an annual issue that focuses on paper coating and coated papers. It is drawn from presentations at TAPPICon and from other submissions on the topic of paper coating. The TAPPICon 2024 Coating track was rich in high-quality technical content. In fact, the papers were of such significance that Coating members of the TAPPI Journal Editorial Board, which include me, Gregg Reed, and Gregory Welsch, decided that a second paper coating-related special issue would be appropriate for the TAPPI Journal editorial calendar. In addition to the current issue on Barrier Coating Testing, there will be another issue on Coating Fundamentals in early 2025.

Journal articles
Magazine articles
Open Access
Quantification of block testing for coated paper substrates, TAPPI Journal November 2024

ABSTRACT: Block resistance is a critical property for coated paper and board substrate that will be rolled, stacked, or otherwise contact itself after coating. Small differences in the coated substrate’s blocking can determine whether the substrate can be successfully used for its designated purpose. However, this crucial property is typically evaluated using a qualitative scale that is based on subjective operator ratings and impacted by factors that include: (1) sound of coated substrate during separation, and (2) force with which substrates are separated. This paper tests the hypothesis that quantifying the block test by measuring the force required to peel samples apart improves the test by: (1) providing more standardized testing conditions by controlling peel force and rate; (2) more clearly differentiating samples that experience minimal to some blocking; and (3) maintaining customizability to evaluate customer-specific test conditions. The method developed in this study uses a standard block tester and block testing conditions, but it peels the coated paper samples using a hot tack/heat seal instrument with force measurement capabilities. This paper demonstrates, using the instrument’s heat seal capabilities, that it can measure peel forces that represent the full range of observable block scores. The efficacy of this method was evaluated by having a group of trained operators engage in a randomized, blind experiment where they assessed block resistance on a set of coated paper samples using a modified qualitative block scale and compared their results to force measurements collected using the proposed method. The sample set included two coatings that have successfully run in commercial trials with minimal blocking, and one coating that experienced significant blocking in commercial trials despite only exhibiting some blocking at standard block test conditions in laboratory testing. The quantitative test method presented in this paper clearly differentiated these samples, whereas the qualitative assessment could not predict which samples had suitable block resistance for commercial use. As any tensile tester capable of measuring with 0.1 N resolution can be used for the Quantitative Block Test, the proposed method can be widely adopted. Furthermore, this method can be used for any block condition.

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