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Relating bending stiffness measurements across various free span lengths, TAPPI Journal August 2020
ABSTRACT: Bending stiffness should be an intrinsic property of a material, so it is puzzling that the TAPPI Standard Test Method T 836 “Bending stiffness, four point method” specifies span lengths when testing different types of corrugated fiberboard. These specified spans often limit the samples that can be measured with this method. To better understand the relationship between bending stiffness and span length, we performed measurements on a range of materials at different spans. The results provide a practical tool enabling comparison of bending stiffness measurements made at various span lengths. Additionally, this note discusses several areas that could serve as the foundation for more fundamental work exploring the bending behavior of corrugated board.
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Editorial: Impacts from using recycled pizza boxes in furnish: TAPPI Journal’s runner-up to 2021 Best Research Paper, TAPPI Journal August 2022
ABSTRACT: The runner-up to the 2021 TAPPI Journal Best Research Paper was “Incorporation of post-consumer pizza boxes in the recover Fiber Stream: Impact of grease on finished product quality."
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Edge crush testing methods and box compression modeling, TAPPI Journal August 2022
ABSTRACT: While multiple test procedures have been developed to assess the inherent compressive strength of corrugated materials (edge crush test, ECT), limited work has explored the appropriateness of each in the context of box compression modeling. This study incorporates a variety of real-world samples, highlighting the varying challenges different ECT methods face in measuring the intrinsic compressive resistance of combined corrugated board. We examine each of these methods as inputs for different types of models, as well as discuss the propagation of measurement variation through the modeling effort. By highlighting the cases in which a given ECT method no longer proves to be an optimal parameter in box compression strength modeling, we explore how we might better measure this material property.
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Editorial: TAPPI’s 2022 Nanotechnology Conference convenes in Finland, TAPPI Journal June 2022
ABSTRACT: TAPPI’s International Conference on Nano-technology for Renewable Materials was finally held in person this past June 13-17 in Helsinki, and more than 200 attendees gathered to participate in the 36-session program. A total of 24 countries were represented at the event and more than one-third of attendees were first-time participants.
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Editorial: Reflections on the Page equation, laboratory work, and new concepts, TAPPI Journal May 2022
ABSTRACT: I began teaching paper physics to undergraduates in the late 1980s when the recognized giants in the field were still actively debating their subjects in the literature and scientific conferences.
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Editorial: The road to sustainable packaging: New research on aqueous barrier coating, TAPPI Journal November 2022
Authors: Joel C. Panek and Peter W. Hart | ABSTRACT: This TAPPI Journal Special Coating Issue looks at hot topic research being done in coatings for paper and paperboard. We can feel the “earth shifting” in paper and paper-board packaging due to the strong call by consumers and brand owners for more sustainable and environmentally friendly options. This is the first TAPPI Journal Special Coating Issue to highlight efforts within the paper coating community to produce more sustainable packaging.
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Editorial: Vipin Varma joins TJ Editorial Board as expert on environmental and sustainability topics, TAPPI Journal October 2022
ABSTRACT: TAPPI and the TAPPI JOURNAL (TJ) editorial staff would like to welcome a new member to the TJ Editorial Board, Vipin Varma, Ph.D., who is vice president, Manufacturing Programs, at the National Council of Air and Stream Improvement (NCASI), headquartered in Cary, NC, USA. NCASI develops technical information that is critical for forest products companies to meet and surpass their environmental and sustainability goals. Vipin will provide expertise on environmental, sustainability, air emissions, and water topics relevant to the pulp and paper industry. In his position on the TJ Editorial Board, he succeeds Paul Wiegand, NCASI’s vice president for Water and Chemical Management Programs, who served from 2007 to 2022.
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Editorial: Ravi Challa brings tissue, nonwovens, and operational expertise to TJ Editorial Board, TAPPI Journal September 2022
ABSTRACT: TAPPI and the TAPPI JOURNAL (TJ) editorial staff would like to welcome a new member to the TJ Editorial Board, Ravi Challa, Ph.D., who is Research & Development (R&D) manager for Suominen Corporation at the company’s Bethune, SC, facility. There, his primary focus is new product development on wetlaid nonwovens paper machines, from maintaining mature technologies and innovation to discovering patterns in paper machine shutdowns and executing nonwovens product development trials.
Journal articles
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Fiber-based characterization of pulp refining, TAPPI Journal September 2022
ABSTRACT: Fiber development in pulp refining can be characterized by three parameters: number of impacts on pulp, N; energy per impact, I, and bar force on fibers, F. These parameters enable comparisons of radically different refining conditions; determination of intensity for hardwoods and softwoods; assessment of effect of bar width on fiber shortening; and predictions of tensile strength increases.
Journal articles
Gap mechanics in pulp refiners, TAPPI Journal June 2025
ABSTRACT: Studies of pulp refining have shown that a single bar impact on pulp has only a 1%•5% probability of producing a successful refining effect. This study has explored the reason why. An analysis of refining kinetics suggested that small segments of a fiber length, about a fiber diameter in size, are treated during each impact. Measurements of localized swelling along fiber lengths caused by refining supported this finding. Based on these findings, it was postulated that force transmittal through fiber networks occurred primarily at fiber crossings. The small size of fiber diameters relative to fiber lengths accounts for the low probability of a successful refining event at each impact. This probability, and the probability of fibers being captured and impacted during passage through a refiner, account for the need for multiple bar crossings to refine pulps.