Search
Use the search bar or filters below to find any TAPPI product or publication.
Filters
Content Type
Publications
Level of Knowledge
Committees
Event Type
Collections
Sip and Learn: TAPPI Nano Student Committee Coffee Break
Interested in a career in renewable nanomaterials? Attend this free one-hour webinar on March 21.
New TAPPI Webinar: Surface Engineering of Cellulose Nanocrystals for Sustainable Bioproduct Development
Register now to guarantee a seat for this April 9 webinar. There is no cost to attend.
Electrically Switched Ion Exchange (ESIX), A New Approach to Managing Potassium Levels in Pulp Mills with Increased Water Recycle, 1998 Pulping Conference Proceedings
Electrically Switched Ion Exchange (ESIX), A New Approach to Managing Potassium Levels in Pulp Mills with Increased Water Recycle, 1998 Pulping Conference Proceedings
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
Impact of Kraft Mill Chemistry on Economics: A Model-Based Approach to Optimizing Mill Profitability, 19PEERS
Impact of Kraft Mill Chemistry on Economics: A Model-Based Approach to Optimizing Mill Profitability, 19PEERS
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
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
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.