Search
Use the search bar or filters below to find any TAPPI product or publication.
Filters
Content Type
Publications
Level of Knowledge
Collections
Magazine articles
INSIDE THE NUMBERS: Paper Companies Building Fast in Eastern Europe and Russia, Solutions!, December 2005, Vol. 88(12) (36 KB)
INSIDE THE NUMBERS: Paper Companies Building Fast in Eastern Europe and Russia, Solutions!, December 2005, Vol. 88(12) (36 KB)
Magazine articles
Rheology testing: An important component of product and process selection, Solutions!, October 2002, Vol. 85(10) (80KB)
Rheology testing: An important component of product and process selection, Solutions!, October 2002, Vol. 85(10) (80KB)
Magazine articles
Mill manager larry newell: "a career, not simply a job", Solutions!, January 2003, Vol. 86(1) (482KB)
Mill manager larry newell: "a career, not simply a job", Solutions!, January 2003, Vol. 86(1) (482KB)
Magazine articles
When Is a Paper Machine Obsolete?, Solutions!, March 2006, Vol. 89(3) (35 KB)
When Is a Paper Machine Obsolete?, Solutions!, March 2006, Vol. 89(3) (35 KB)
Magazine articles
FPAC aims to make an impact on Europe, Solutions!, January 2003, Vol. 86(1) (511KB)
FPAC aims to make an impact on Europe, Solutions!, January 2003, Vol. 86(1) (511KB)
Magazine articles
Framing the future breakthrough technology for wood and wood composites, Solutions!, November 2002, Vol. 85(11) (483KB)
Framing the future breakthrough technology for wood and wood composites, Solutions!, November 2002, Vol. 85(11) (483KB)
Magazine articles
MANAGERâ??S NOTEBOOK: Paper Industry is Ripe for Lean and Six Sigman Improvement Processes, Solutions!, December 2005, Vol. 88(12) (40 KB)
MANAGER’S NOTEBOOK: Paper Industry is Ripe for Lean and Six Sigman Improvement Processes, Solutions!, December 2005, Vol. 88(12) (40 KB)
Magazine articles
SPOTLIGHT: Life, Liberty and the Pursuit of Efficiency, Solu
SPOTLIGHT: Life, Liberty and the Pursuit of Efficiency, Solutions!, July 2005, Vol. 88(7)
Magazine articles
Engineered-plastic cooling towers: The latest productivity b
Engineered-plastic cooling towers: The latest productivity booster for pulp and paper operations, Solutions!, Online Exclusives, August 2005, Vol. 88(8)
Journal articles
Magazine articles
Improving paper wet strength via increased lignin content and hot-pressing temperature, TAPPI JOURNAL October 2020
ABSTRACT: It is known that the strength properties of wood-based paper materials can be enhanced via hot-pressing techniques. Today, there is a desire not only for a change from fossil-based packaging materials to new sustainable bio-based materials, but also for more effective and eco-friendly solutions for improving the dry and wet strength of paper and board. Against this background, hot pressing of paper made from high yield pulp (HYP), rich in lignin, becomes highly interesting. This study investigated the influence of pressing temperature and native lignin content on the properties of paper produced by means of hot pressing. Kraft pulps of varied lignin content (kappa numbers: 25, 50, 80) were produced at pilot scale from the same batch by varying the cooking time. We then studied the effect of lignin content by evaluating the physical properties of Rapid Köthen sheets after hot pressing in the temperature range of 20°C•200°C with a constant nip pressure of 7 MPa. The pilot-scale cooked pulps were compared with reference samples of mill-produced northern bleached soft-wood kraft (NBSK) pulp and mill-produced chemithermomechanical pulp (CTMP).Generally, the results demonstrated that lignin content had a significant effect on both dry and wet tensile index. All of the pilot cooked pulps with increased lignin content had a higher tensile index than the reference NBSK pulp. To obtain high tensile index, both dry and wet, the pressing temperature should be set high, preferably at least 200°C; that is, well above the glass transition temperature (Tg) for lignin. Moreover, the lignin content should prefera-bly also be high. All kraft pulps investigated in this study showed a linear relationship between wet strength and lignin content.