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Journal articles
Open Access
Practical aspects of alkaline sizing: alkyl ketene dimer in mill furnishes, TAPPI JOURNAL, August 1991, Vol. 74(8)

Practical aspects of alkaline sizing: alkyl ketene dimer in mill furnishes, TAPPI JOURNAL, August 1991, Vol. 74(8)

Journal articles
Open Access
Application of Information Theory to Characterize Print Quality, TAPPI JOURNAL, August 1991, Vol. 74(8)

Application of Information Theory to Characterize Print Quality, TAPPI JOURNAL, August 1991, Vol. 74(8)

Journal articles
Open Access
Experiences using super pressurized groundwood at a finnish supercalender paper mill, TAPPI JOURNAL, December 1991, Vol. 74(12)

Experiences using super pressurized groundwood at a finnish supercalender paper mill, TAPPI JOURNAL, December 1991, Vol. 74(12)

Journal articles
Open Access
Options for controlling connective coating dryers, TAPPI JOURNAL, December 1991, Vol. 74(12)

Options for controlling connective coating dryers, TAPPI JOURNAL, December 1991, Vol. 74(12)

Journal articles
Open Access
Insights into boiling heat transfer in impulse drying, TAPPI JOURNAL, February 1991, Vol. 74(2)

Insights into boiling heat transfer in impulse drying, TAPPI JOURNAL, February 1991, Vol. 74(2)

Journal articles
Open Access
Principles of hydrodynamic instability: application in coating systems, TAPPI JOURNAL, February 1991, Vol. 74(2)

Principles of hydrodynamic instability: application in coating systems, TAPPI JOURNAL, February 1991, Vol. 74(2)

Journal articles
Open Access
The relationship between zeta potential and ionic demand and how it affects wet-end retention, TAPPI JOURNAL, January 1991, Vol. 74(1)

The relationship between zeta potential and ionic demand and how it affects wet-end retention, TAPPI JOURNAL, January 1991, Vol. 74(1)

Journal articles
Open Access
Finishing and converting conference stresses recycling, quality, and computer implementation, TAPPI JOURNAL, January 1991, Vol. 74(1)

Finishing and converting conference stresses recycling, quality, and computer implementation, TAPPI JOURNAL, January 1991, Vol. 74(1)

Journal articles
Magazine articles
Open Access
Colloid chemical aspects of paper formation in the presence of nanofibrillated cellulose and cationic starch, TAPPI Journal September 2024

ABSTRACT: A series of experimental tests were carried out to examine colloidal-scale consequences of optionally treating nanofibrillated cellulose (NFC) with cationic starches of different charge density and dosage (0.5% or 2.0% by weight), adding that material to a furnish prepared from 100% recycled copy paper, and then subjecting the mixture to very different levels of hydrodynamic shear. Tests included optical microscopy, sediment volume tests, sediment velocity tests, and “percent fines” assessment by means of a fiber quality analyzer (FQA). In addition, the zeta potential and charge demand of the studied materials were evaluated. Optical imaging revealed that cationic starch treatment of the NFC tended to agglomerate it into multiparticle clusters, which sometimes could be mostly redispersed by hydrodynamic shear. Subsequent addition of the starch-treated NFC to the default furnish resulted in much of the colloidal material becoming attached to fibers. Subsequent shearing of the mixtures was at least partly effective in separating the clusters of NFC from the fiber surface, resulting in essentially a two-component mixture. Multiparticle NFC clusters coexisted with the fiber suspension, sometimes attached and sometimes not, depending on the details of treatments. Sediment volume tests showed that systems containing cationic starch-treated NFC tended to have a higher density after settling in comparison to untreated NFC; these findings are consistent with the cationic starch acting as a stabilizer on the solid surfaces, allowing them to slide past each other during the settling process. Application of intense hydrodynamic shear tended to result in denser sediment. Results of tests with the sediment velocity messurement and the FQA percent fines assessment did not correlate well with changes in test conditions considered in this study.

Journal articles
Open Access
On the design of corrugated boards: A new FEM modeling and experimental validation, TAPPI Journal August 2025

ABSTRACT: This study presents a simplified finite element modeling (FEM) approach suitable for large structures made of corrugated boards, such as customized packages, based on a homogenization method, which is combined with correction factors for internal mechanisms. The homogenization process reduces computational time by transforming flute geometries into equivalent elastic models. In large deformations and in the presence of contact for a given geometry, the effective elastic modulus in the thickness direction, as well as the effective thickness of the structure, are corrected by two statistical Weibull distributions representing the contact and buckling mechanisms in a corrugated board. The Weibull parameters are obtained via experimental analysis, and such a process is then validated. The results demonstrate that the statistical parameters (â1 = 0.14, â2 = 1.31) can be used for the simplistic representation of corrugated boards, being computationally efficient. This research contributes to the optimization of corrugated packaging design, specifically by simplifying FEM models for faster, yet equally accurate, simulations.

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