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Journal articles
Calendering model for CD control, TAPPI JOURNAL, December 2002, Vol. 1(10) (434KB)
Calendering model for CD control, Solutions! & TAPPI JOURNAL, December 2002, Vol. 1(10) (434KB)
Journal articles
Data for better maintenance plans and investments policy, Solutions! & TAPPI JOURNAL, August 2003, Vol. 2(8) (354KB)
Data for better maintenance plans and investments policy, Solutions! & TAPPI JOURNAL, August 2003, Vol. 2(8) (354KB)
Journal articles
Statistical modeling and sizing determination guides for dispersed rosin sizes, Solutions! & TAPPI JOURNAL, September 2004, Vol. 3(9) (250KB)
Statistical modeling and sizing determination guides for dispersed rosin sizes, Solutions! & TAPPI JOURNAL, September 2004, Vol. 3(9) (250KB)
Journal articles
Improvement of paper properties using starch-modified precipitated calcium carbonate filler, TAPPI JOURNAL & Solutions! February 2005, Vol. 4(2) (304KB)
Improvement of paper properties using starch-modified precipitated calcium carbonate filler, TAPPI JOURNAL & Solutions! February 2005, Vol. 4(2) (304KB)
Journal articles
Where to add retention aid: issues of time and shear, TAPPI JOURNAL, March 2002 (174KB)
Where to add retention aid: issues of time and shear, SOLUTIONS & TAPPI JOURNAL, March 2002 (174KB)
Journal articles
A new retention aid for the production of SC printing grades: pilot paper machine results, TAPPI JOURNAL, September 2003, Vol. 2(9) (255KB)
A new retention aid for the production of SC printing grades: pilot paper machine results, Solutions! & TAPPI JOURNAL, September 2003, Vol. 2(9) (255KB)
Journal articles
An examination of two hybrid top-wire former configurations for producing newsprint, TAPPI JOURNAL, October 2003, Vol. 2(10) (300KB)
An examination of two hybrid top-wire former configurations for producing newsprint, Solutions! & TAPPI JOURNAL, October 2003, Vol. 2(10) (300KB)
Journal articles
The influence of impulse drying on the performances of papers containing cationic starch and calcium carbonate, TAPPI JOURNAL, November 2002, Vol. 1(9) (512KB)
The influence of impulse drying on the performances of papers containing cationic starch and calcium carbonate, Solutions! & TAPPI JOURNAL, November 2002, Vol. 1(9) (512KB)
Journal articles
Magazine articles
Novel test method for measuring defects in barrier coatings, TAPPI Journal November 2022
ABSTRACT: In the last several years, activity to develop water-based barrier coatings (WBBCs) that meet challenging packaging performance requirements has increased dramatically. Cellulose-based packaging solutions can provide a more sustainable packaging option for replacing single-use plastic-based options like extrusion-based and laminated materials. An advantage of WBBCs is the opportunity to reduce the coating thickness applied, as long as the barrier requirements can be met. A challenge that must be overcome is the ability to maintain a defect and pin-hole-free coating layer after coating and drying to retain the barrier performance. Many formulation and coating parameters can affect the barrier coating layer quality; however, methods for detecting more subtle differences in these types of studies are not widely available. Work was carried out to develop a quantitative technique for detecting and measuring the quantity and size of defects in the barrier coating layer. A test method has been developed using a combination of dyed oil and image analysis to be able to characterize the imperfections in the coating surface. The use of dyed oil serves two purposes. First, it better simulates the types of materials, in this case, oils and grease, for which the barrier coating is expected to hold out. Second, it also provides contrast between the coating and failure points for testing. An image analysis technique is employed to characterize the number and size of the imperfections. For the former, it reduces the testing time required if a quality control or laboratory technician counts the dots. For the latter, it assists with judgment on the source of the root cause of the imperfection, such as base sheet defects, coating dispersion issues, or perhaps micro-blisters in the coating, as some examples.To show the benefit of this technique, several pilot coating studies were designed to see if the new technique could be utilized to detect differences in WBBC performance. Both process and chemical variables were evaluated. With refinement, it is believed this technique can be utilized in development work, as well as for a potential quality control technique for manufacturing of coated paper and paperboard products.
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.