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FORMATION OF PIRSSONITE IN GREEN LIQUOR HANDLING SYSTEMS, 2012 TAPPI PEERS Conference

FORMATION OF PIRSSONITE IN GREEN LIQUOR HANDLING SYSTEMS, 2012 TAPPI PEERS Conference

Conference papers
Evaporators, The Place To Look For Energy And Water Usage Re

Evaporators, The Place To Look For Energy And Water Usage Reductions, 2015 PEERS Conference

Rheological Properties of Starch Latex Dispersions and Starch Latex-Containing Coating Colors, 2012 PaperCon Conference

Rheological Properties of Starch Latex Dispersions and Starch Latex-Containing Coating Colors, 2012 PaperCon Conference

Conference papers
Surface application of cellulose microfibrils on paper • Effects of basis weight and surface coverage levels, 19PaperCon

Surface application of cellulose microfibrils on paper • Effects of basis weight and surface coverage levels, 19PaperCon

Conference papers
Fluff Pulp Performance Improved by Alternative Pine Species, 19PEERS

Fluff Pulp Performance Improved by Alternative Pine Species, 19PEERS

Conference papers
Review of the Economics, Technologies and Products in the Non-wood Sector, 19PEERS

Review of the Economics, Technologies and Products in the Non-wood Sector, 19PEERS

Conference papers
HOW CAN I MAKE SENSE OF ALL THIS DATA?, 19PEERS

HOW CAN I MAKE SENSE OF ALL THIS DATA?, 19PEERS

Journal articles
Magazine articles
Open Access
How to use total dissolved solids measurements to evaluate the performance of diffuser washers—A mill study, TAPPI Journal April 2020

ABSTRACT: Various types of pulp washing equipment are available. Each washing device has a unique mechanical construction, and the washing principle is often a combination of dilution, thickening, and displacement washing. In this work, the performance of the pressure diffuser washer is studied. In stepwise trials, the effect of the feed and discharge consistencies on the performance of the diffuser was studied. The effect of the downward velocity of the screen on the pressure diffuser’s washing efficiency was also studied. The measurement of total dissolved solids (TDS) by a process refractometer was used as a wash loss measurement unit and the refractometer’s results were used in the calculations of standardized Nordén efficiency (E10) values. The chemical oxygen demand (COD) and conductivity values were also measured and their results compared to the TDS results.The results indicated that feed consistency has a significant effect on the performance and effectiveness of the diffuser washers in the mill. It can also be stated that when the downward velocity of the screen is adjusted to too high a level, the washing efficiency of the pressure diffuser decreases. As a conclusion from the mill tests, it can be stated that even small process parameter changes can provide enhanced diffuser washing at the beginning of the washing line, which has a direct effect on the performance of post-oxygen washing.

Journal articles
Magazine articles
Open Access
Viscoelastic web curl due to storage in wound rolls, TAPPI Journal July 2020

ABSTRACT: Winding is often the final operation in a roll-to-roll manufacturing process. Web materials, i.e., materials that are thin compared to their length, are wound into rolls because this form is the only practical means to store them. The resulting bending strains and associated stresses are large for thick webs and laminates. As many webs are viscoelastic on some time scale, bending stresses lead to creep and inhomogeneous changes in length. When the web material is unwound and cut into discrete samples, a residual curvature remains. This curvature, called curl, is the inability for the web to lie flat at no tension. Curl is an undesirable web defect that causes loss of productivity in a subsequent web process. This paper describes the development and implementation of modeling and experimental tools to explore and mitigate curl in homogenous webs. Two theoretical and numerical methods that allow the prediction of curl in a web are developed: a winding software based on bending recovery theory, and the implementation of dynamic simula-tions of winding. One experimental method is developed that directly measures the curl online by taking advantage of the anticlastic bending resulting from the curl. These methods are demonstrated for a low-density polyethylene web.

Journal articles
Magazine articles
Open Access
Effects of tissue additives on copy paper forming and properties, TAPPI Journal February 2024

ABSTRACT: Laboratory tests were conducted in an effort to determine the effects on paper machine process attributes and the properties of paper made from recycled copy paper furnish upon the addition of chemical agents that are commonly used in the production of hygiene tissue products. Due to continuing growth in tissue and towel grades of paper, such agents are experiencing greater usage. Charge titration test results revealed that certain dry strength agents associated with tissue manufacturing have the potential to shift the balance of charge in papermaking furnish to less negative or even positive values. Creping adhesive was found to contribute to fine particle retention, especially when present at relatively high levels. Release aid and a polyacrylate dispersant had the opposite effect. Low addition levels of both a creping adhesive and a debonding agent surprisingly increased a wide range of strength attributes of paper handsheets in comparison to sheets prepared from unaltered recycled copy paper furnish. The debonding agent decreased paper strength at higher levels of addition. Such effects appear to depend not only on the expected effects of agents themselves, but also on how they affect the charge balance of the wet-end system.