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Improved Wet Bulk Storage of Bagasse for Newsprint Pulp Production - Part I, 1993 Pulping Conference Proceedings
Improved Wet Bulk Storage of Bagasse for Newsprint Pulp Production - Part I, 1993 Pulping Conference Proceedings
Journal articles
Improving Softwood Mechanical Pulp Properties with Ophiostom
Improving Softwood Mechanical Pulp Properties with Ophiostoma Piliferum, 1995 Pulping Conference Proceedings
Journal articles
Technical Evaluation: Methods for Sealing Paper/Foil Aseptic
Technical Evaluation: Methods for Sealing Paper/Foil Aseptic Food Packages, 1996 Polymers, Laminations & Coatings Conference Proceedings
Journal articles
A method to produce paperboard with a lightweight low-density coating, TAPPI Journal November 2025
ABSTRACT: In this work, a method is described in which a coating layer is produced that consists of a network of bubble-shaped air-filled voids within the coating. This is accomplished by instantaneously flash-drying all the water in the coating as it exits the application nip. The nip is formed between a polished chrome drum and a deformable press roll. The combination of the drum temperature, nip pressure, and nip width allow for sufficient energy to be transferred to the coating to completely flash-dry the coating material. The pressure within the nip is sufficient to allow the coating to superheat within the nip, then flash boil as it exits the nip. This boiling effect and resulting expansion are constrained by the roll surface, resulting in a coated surface that mirrors the polished chrome surface. The coating immobilizes while in the process of boiling, which preserves the bubble structure. With a coat weight of 5 g/m2, a flat, smooth surface is produced. This process was scaled up to a mill production machine layout and run at speeds as high as 450 m/min.
Journal articles
Pre-damping effects on water absorption and drying dynamics in flexographic printing, TAPPI Journal November 2025
ABSTRACT: Optimizing flexographic printability can involve the ink and the substrate, as well as the printing process. It has been widely reported in the literature that controlling topography of the substrate and its porosity are vital for good flexographic printability, especially when using water-based inks. This study focuses on how pre-damping a surface impacts liquid absorption and improves wet trapping (ink on ink with no intermediate drying) in flexographic printing. A Prüfbau universal print tester was adapted to analyze flexographic wet-on-wet ink printing and trapping using yellow and magenta inks for contrast. Slow drying of the first ink layer (yellow) leads to mottle when the second layer (magenta) is applied. The study explores the “wet sponge” hypothesis: a pre-damped surface should absorb liquid faster. The Lucas- Washburn equation describes long-term absorption, but it does not capture short-term uptake, which instead follows a linear dependence on time.
Journal articles
ABSTRACT: This study investigates the impact of pulp screening on oxygen delignification of high lignin content kraft pulps from spruce wood. An alternative process is proposed: terminating kraft cooking at higher kappa numbers and applying oxygen deligni
ABSTRACT: This study investigates the impact of pulp screening on oxygen delignification of high lignin content kraft pulps from spruce wood. An alternative process is proposed: terminating kraft cooking at higher kappa numbers and applying oxygen delignification directly to unscreened and non-defibrated pulp. The objective is to evaluate whether this non-standard approach can maintain delignification efficiency while improving yield and reducing energy input. The findings demonstrate that screening prior to oxygen delignification is not essential for effective lignin removal or pulp quality. Similar delignification degrees and ISO brightness levels were obtained after oxygen delignification, whether it was performed on screened or unscreened pulps. Notably, the delignification rate in the oxygen stage was the same for the non-standard procedure as for pulp from the standard procedure with the reject fractionremoved prior to the oxygen stage. No significant differences were seen in fiber morphology, brightness level, orbrightness stability. The amount of total fiber charges in pulps not screened before oxygen delignification was slightly higher than in screened pulps.
Journal articles
ABSTRACT: Lignin’s potential as a source of sustainable aromatic compounds is significant, but its utilization is currently limited by its chemical reactivity. Chemical reactivity of lignin depends on the present functional groups, such as hydroxyl, metho
ABSTRACT: Lignin’s potential as a source of sustainable aromatic compounds is significant, but its utilization is currently limited by its chemical reactivity. Chemical reactivity of lignin depends on the present functional groups, such as hydroxyl, methoxy, and carbonyl groups. Therefore, in this study, multivariate analysis-based chemometric models have been developed for rapid determination of aliphatic hydroxyl (Alp-OH) and phenolic hydroxyl (Ph-OH) groups in lignin samples. Two chemometric models, principal component regression (PCR) and partial least squares regression (PLSR), were established with Fourier transform infrared spectroscopy (FTIR) spectral data of 28 lignin samples. Both the models were developed based on raw and pretreated spectroscopic data with Savitky-Golay (S-G) filtering and standard normal variate (SNV) and multiplicative scatter correction (MSC). The predictive performance of the PLSR model is better for predicting Alp-OH (R2 = 0.94%), syringyl-OH (R2 = 0.96%), guaiacyl-OH (R2 = 0.98%), p-hydroxyphenyl (R2 = 0.93%), and total Ph-OH groups (R2 = 0.97%) with the data pretreated by MSC. Finally, the predicted results of these parameters for three new samples for the developed models are found to be very close to the estimated values by NMR.
Journal articles
Effect of pulp refining on thixotropy of cellulose fiber suspensions, TAPPI Journal September 2025
ABSTRACT: This paper presents results on the thixotropic behavior of low-consistency bleached eucalyptus fiber suspensions that had been mechanically treated. The pulps were refined in a PFI mill at different numbers of revolutions (0, 3000, and 6000) to study the effect of refining intensity on the viscosity time-response of fiber suspensions. In steady rheological tests, all the suspensions exhibited shear thinning behavior and no significant differences were observed after mechanical treatment. Stepwise experiments showed that viscosity continuously increased with time when shear rate was suddenly reduced. Additionally, a delay in time evolution of viscosity was observed as the pulp was more refined. A stretched exponential model was fitted to the experimental results of viscosity.
Journal articles
Effects of biopolymer coatings on paper permeability and capillarity for paper-based rapid diagnostic test devices, TAPPI Journal September 2025
ABSTRACT: Rapid diagnostic test (RDT) devices are widely used for diagnostics due to their affordability, portability, and user-friendliness. However, conventional assays typically rely on nitrocellulose membranes and plastic casings. These materials raise environmental concerns due to their non-renewable nature, energy-intensive production methods, and poor biodegradability. This study explores the development of fully bio-based RDT substrates using a sustainable alternative: softwoodderived microfibrillated cellulose (MFC), cellulose nanocrystals (CNC), and chitosan as surface modifiers to improve paper properties and enhance RDT sustainability. Cotton filter paper substrates were coated with different biopolymer formulations using a manual blade coater: bleached MFC (BMFC), lignin-containing MFC (LMFC), BMFC combined with CNC, LMFC combined with CNC, and chitosan. Evaluation of the most relevant physical properties concerning RDT performance was conducted, including wetting, water retention value, air permeability, capillary flow rate, and surface morphology. Results showed that biopolymer- based coatings can effectively modify surface properties by reducing pore size and tuning hydrophilicity, while maintaining the renewable and bio-based characteristics of the substrate. The LMFC-coated paper exhibited the best overall performance among all formulations, reducing flow time by 50% (3.00 mm/s vs. 1.5 mm/s) compared to the uncoated paper, yet preserving high water retention. The BMFC+CNC coating also significantly improved flow rate, showing a 36.7% reduction (2.37 mm/s vs. 1.5 mm/s), and enhanced porosity uniformity. In contrast, the flow rate of chitosan-coated paper decreased by over 5,000% (0.027 mm/s), reflecting its strong barrier properties and hydrophobic surface (highest contact angle: 91.4°). These findings suggest that MFC-based coatings are promising ecofriendly alternatives to nitrocellulose, offering optimized capillary transport and structural adaptability. This paves the way for the development of sustainable, high-performance, rapid diagnostic tests.
Journal articles
Toward environmental resilience in pulp and paper manufacturing: Water consumption and carbon dioxide emission reductions, TAPPI Journal September 2025
ABSTRACT: Pulp and paper manufacturing is a water- and energy-intensive industrial sector, necessitating improvement of its operational efficiency, as well as reduction of emissions to the maximum extent possible. This review focuses on the reduction of water consumption and carbon dioxide (CO2) emissions that originate in the pulp and paper industry (PPI). First, process simulation and optimization techniques used for water consumption reduction are reviewed. Then, techno-economic analyses of solvent-based CO2 capture from PPI are discussed. Additionally, key actions are proposed for enhancing water consumption reduction and CO2 capture in PPI.