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Evaluation of folding effects on coating damage, TAPPI Journal November 2024

ABSTRACT: Barrier coatings on paperboard need to maintain integrity during converting and end-use for effective barrier performance. Folding is one of the most common deformations during converting; however, factors that affect damage during folding are not well defined. This is partly because methods to fold specimens and characterize damage are not standardized and the results are generally not transferable. In this work, we describe a method to fold paper specimens precisely and reproducibly. The keys to folding include using a defined geometry and controlled deformation. Multiple methods can be used to quantify damage; in this case, we use differences in permeability as a measure of how the coating becomes more open. Damage is sensitive to the degree of compression after the initial folding. Using a shim for support provides a defined amount of compression and minimizes the sensitivity to the applied pressure.

Europap Tezol’s New Vacuum System: Peace of Mind and Major Savings, Tissue360º Spring/Summer 2024

Multivariate Modelling of Paper Strengths from Fibre Properties • Virgin Kraft Pulp, TAPPICon24

Utilization of kraft pulp mill residuals, TAPPI Journal February 2022

ABSTRACT: Kraft pulp mills produce on average about 100 kg of solid residuals per metric ton of pulp produced. The main types of mill waste are sludge from wastewater treatment plants, ash from hog fuel boilers, dregs, grits, and lime mud from causticizing plants and lime dust from lime kilns. Of these, about half is disposed of in landfills, which highlights the need and potential for waste recycling and utilization. Sludge is either incinerated in hog fuel boilers to generate steam and power or used in various forms of land application, including land spreading, composting, or as an additive for landfill or mine waste covers. The majority of hog fuel boiler ash and causticizing plant residues is landfilled. Alkaline residuals can be conditioned for use in land application, manufacture of construction materials, and production of aggregates for road work. This technical review summarizes residuals utilization methods that have been applied in pulp and paper mills at demonstration- or full-scale, and therefore may act as a guide for mill managers and operators whose goal is to diminish the costs and the environmental impact of waste management.

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.

Emerging Dominant Bearing Failure Mode as Temperatures Escalate in the Dryer Section, 2021 TAPPICon Live (21TAPL)

How to Keep Advanced Process Controls (APCs) Operational Longer than 24?Months, 2021 TAPPICon Live (21TAPL)

How to Keep Advanced Process Controls (APCs) Operational Longer than 24?Months, 2021 TAPPICon Live (21TAPL)

Issues with Dust Control, 2021 TAPPICon Live (21TAPL)

Issues with Dust Control, 2021 TAPPICon Live (21TAPL)

Less Emissions and improved efficiency in Coat Drying - Project Implemented in Sappi Gratkorn OMC 9, 2021 TAPPICon Live (21TAPL)

Less Emissions and improved efficiency in Coat Drying - Project Implemented in Sappi Gratkorn OMC 9, 2021 TAPPICon Live (21TAPL)

Numerical analysis of slot die coating of nanocellulosic materials, 2021 TAPPICon Live (21TAPL)

Numerical analysis of slot die coating of nanocellulosic materials, 2021 TAPPICon Live (21TAPL)