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Pilot-made, highly extensible paper for dry 3D forming, TAPPI Journal May 2025

Cellulose fiber-based packaging materials must perform well in demanding three dimensional (3D) forming process conditions. On the other hand, the development of manufacturing concepts is required for improved competitiveness of bio-based materials. This study covers some key factors that influence the extensibility of cellulose fiber-based structures and presents a pilot-scale development study of a 3D formable material concept. Bleached softwood kraft (BSK) pulp from a Nordic pulp mill was used in the pilot trials. Cellulose-based webs were formed using water-laid and foam-laid web forming using a pilot paper machine. For the water-laid forming, the BSK pulp was refined by applying a high consistency (HC) phase at over 40% consistency, followed by a low consistency (LC) refining at 4% consistency. The BSK pulp was refined for the foam-laid forming by only applying lowconsistency refining. In the foam-laid web forming, anionic sodium dodecyl sulfate (SDS), two foamable latexes, and polyvinyl alcohol (PVA) were used as foaming agents. The pilot rolls were dried at a separate steam cylinder dryer pilot and compacted in-plane in the machine direction (MD) at a separate pilot machine. Tensile properties of the treated paper webs were measured and evaluated with respect to achieved web shrinkage. The same dimensional contraction brought by shrinkage was almost strained out in tensile testing. The results indicated that the shrinkage that occurred by drying and in-plane compaction depended on the pulp furnish. The water-laid material achieved about 30% elongation, whereas the foam-laid material achieved significantly above 50% elongation. The 3D forming performance of the dry materials was tested using fixed and sliding blank methods. The dry paper sheets performed well enough in 3D forming for application to many consumer package applications according to their extensibility.

MULTI-FUNCTIONAL BARRIER COATING SYSTEMS CREATED BY MULTI-LAYER CURTAIN COATING, 2021 TAPPICon Live (21TAPL)

Web lateral instability caused by nonuniform paper properties, TAPPI Journal January 2022

ABSTRACT: Lateral or cross-machine direction (CD) web movement in printing or converting can cause problems such as misregistration, wrinkles, breaks, and folder issues. The role of paper properties in this problem was studied by measuring lateral web positions on commercial printing presses and on a pilot-scale roll testing facility (RTF). The findings clearly showed that CD profiles of machine direction (MD) tension were a key factor in web stability. Uneven tension profiles cause the web to move towards the low-tension side. Although extremely nonuniform tension profiles are visible as bagginess, more often, tension profiles must be detected by precision devices such as the RTF. Once detected, the profiles may be analyzed to determine the cause of web offset and weaving problems.Causes of tension profiles can originate from nonuniform paper properties. For example, by means of case studies, we show that an uneven moisture profile entering the dryer section can lead to a nonuniform tension profile and lateral web movement. Time-varying changes in basis weight or stiffness may also lead to oscillations in the web’s lateral position. These problems were corrected by identifying the root cause and making appropriate changes. In addition, we developed a mathematical model of lateral stability that explains the underlying mechanisms and can be used to understand and correct causes of lateral web instability.

Upgrading of recycled pulp quality by fractionation and selective refining, TAPPICon22

Advances in Weld Overlay Technology Provide Corrosion Protection in Kraft Digesters, 1995 Engineering Conference Proceedings

Advances in Weld Overlay Technology Provide Corrosion Protection in Kraft Digesters, 1995 Engineering Conference Proceedings

Advanced Control of a Dual Vessel Continuous Digester Running ISO -Thermal Cooking, 1998 Pulping Conference Proceedings

Advanced Control of a Dual Vessel Continuous Digester Running ISO -Thermal Cooking, 1998 Pulping Conference Proceedings

Metered Size Press Coating with High Solids Content Formulations at High Machine Speeds, 2002 Metered Size Press Forum

Metered Size Press Coating with High Solids Content Formulations at High Machine Speeds, 2002 Metered Size Press Forum

Converting and End-Use Approach to Alkaline Fine Paper Size Development, 1994 Papermakers Conference Proceedings

Converting and End-Use Approach to Alkaline Fine Paper Size Development, 1994 Papermakers Conference Proceedings

New Clathrate Hydrates for Second Generation Freeze Concentration Applicaiton in Paper Industry, 1997 Papermakers Conference Proceedings

New Clathrate Hydrates for Second Generation Freeze Concentration Applicaiton in Paper Industry, 1997 Papermakers Conference Proceedings

Third Generation Reeling, 1999 Papermakers Conference Proceedings

Third Generation Reeling, 1999 Papermakers Conference Proceedings