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Journal articles
Magazine articles
RISI’s European CEO of the Year: Ksenia Sosnina, Ilim Group, Paper360º March/April 2020

RISI’s European CEO of the Year: Ksenia Sosnina, Ilim Group, Paper360º March/April 2020

Journal articles
Magazine articles
Open Access
Fundamental understanding of removal of liquid thin film trapped between fibers in the paper drying process: A microscopic approach, TAPPI Journal May 2020

ABSTRACT: In the fabrication of paper, a slurry with cellulose fibers and other matter is drained, pressed, and dried. The latter step requires considerable energy consumption. In the structure of wet paper, there are two different types of water: free water and bound water. Free water can be removed most effectively. However, removing bound water consumes a large portion of energy during the process. The focus of this paper is on the intermediate stage of the drying process, from free water toward bound water where the remaining free water is present on the surfaces of the fibers in the form of a liquid film. For simplicity, the drying process considered in this study corresponds to pure convective drying through the paper sheet. The physics of removing a thin liquid film trapped between fibers in the paper drying process is explored. The film is assumed to be incompressible, viscous, and subject to evaporation, thermocapillarity, and surface tension. By using a volume of fluid (VOF) model, the effect of the previously mentioned parameters on drying behavior of the thin film is investigated.

Journal articles
Magazine articles
´We Must Grow—In All Areas’, Paper360º May/June 2020

´We Must Grow—In All Areas’, Paper360º May/June 2020

Journal articles
Magazine articles
Open Access
Pigmented aqueous barrier coatings, TAPPI Journal November 2020

ABSTRACT: The desire for more sustainable packaging has led to the development of new packaging materials that are fiber based. Aqueous coatings are a pathway to improve the recyclability of these materials. Pigments used in these coatings can improve the performance of the coating and reduce cost while further improving the recyclability. Mineral pigments are also considered to be compost neutral. In this paper, we provide the reader a better fundamental understanding of the mechanisms by which pigments work in barrier coatings. A pigment’s mineralogy and physical characteristics are important to how it will perform, and there have been recent pigment developments that improve coating performance. This paper shows that some pigments are better than others in particular barrier applications. Also, pigmented base or pre-coats can be used to prepare the surface for more highly functional coatings that go on top, improving the barrier function of packaging material and reducing overall cost. Finally, the converting operation is of major importance in driving formulation choices for barrier applications.

Conference papers
Unlocking the Growth Potential of Digitally Printed Folding Cartons through Functional Coatings, 21TAPPICon Virtual

Unlocking the Growth Potential of Digitally Printed Folding Cartons through Functional Coatings, 21TAPPICon Virtual

Conference papers
Unique steel belt press technology for development of high strength papers from HYP, 21TAPPICon Virtual

Unique steel belt press technology for development of high strength papers from HYP, 21TAPPICon Virtual

Conference papers
Machine Learning Algorithm for Online Identification of Web End Stability, 21TAPPICon Virtual

Machine Learning Algorithm for Online Identification of Web End Stability, 21TAPPICon Virtual

Journal articles
Magazine articles
Open Access
Calender barring review with experiences, TAPPI Journal July 2022

ABSTRACT: Excessive calender vibration affects all styles of calender stacks from single to multi-nip, all hard rolls, or a combination of hard and soft rolls. Calender vibration can be forced vibration or self-excited vibration. Forced vibration occurs at the first few harmonics of the calender roll rotational speeds and is caused by imbalance, misalignment, eccentricity, etc. Self-excited vibration, the focus of this paper, occurs at higher frequencies. Feedback paths for self-excited vibration must be understood in order to ameliorate the problem. This is presented in the context of the historical development of the theory of self-excited feedback mechanisms, followed by a survey of self-excited feedback mechanisms in various types of calender stacks. Methodology to determine which feed-back path is present and techniques to control or eliminate the resulting vibration follow. To obtain a flavor of the types of problems faced and practical remedial actions, a variety of experiences with barring issues are provided.

Effects of Selective Addition of Papermaking Chemicals to Fines and Long Fibres on Strength and Runnability of Wet Paper, 2008 PAPERCON Conference

Effects of Selective Addition of Papermaking Chemicals to Fines and Long Fibres on Strength and Runnability of Wet Paper, 2008 PAPERCON Conference

Advances in Design of Elastic Guiding Vanes Used in Traditional and Stratified Headboxes, 2008 PAPERCON Conference

Advances in Design of Elastic Guiding Vanes Used in Traditional and Stratified Headboxes, 2008 PAPERCON Conference

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