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Mechanistic aspects of nanocellulose•cationic starch•colloidal silica systems for papermaking, TAPPI Journal February 2023

ABSTRACT: Optimization of a chemical additive program for a paper machine can require attention to both colloidal charges and kinetic effects. This work considered an additive program with two negatively charged substances (nanofibrillated cellulose [NFC] and colloidal silica) and two positively charged items (cationic starch and cationic acrylamide copolymer retention aid). Results were shown to depend on charge interactions; however, that clearly was not the whole story. Some findings related to cationic demand, dewatering, fine-particle retention, and flocculation among fibers were best explained in terms of at least partly irreversible complexation interactions between the charged entities. Adjustments in ratios between oppositely charged additives, their sequences of addition, and effects of hydrodynamic shear levels all affected the results. In general, the most promising results were obtained at a cationic starch level of 0.25% to 0.5% based on sheet solids in systems where the cationic starch was used as a pretreatment for NFC.

An analytical method to quantitatively determine the amount of polyamide epichlorohydrin (PAE) in paperboard and white water, TAPPI Journal February 2023,

ABSTRACT: Polyamide epichlorohydrin (PAE) is a permanent wet strength resin. When applied to paperboard, some amount of resin is retained in the sheet, and some is lost to the white water. An analytical method for quantifying the amount of PAE retained in the sheet and lost into the white water has been developed. This method hydrolyzes the PAE to adipic acid, which in turn is derivatized to diethyl adipate and quantified by pyrolysis gas chromatography•mass spectrometry (pyGCMS). In addition, the hydrolysis conditions of the PAE were studied by the Taguchi approach, and PAE material balances around the dry sheet and white water for 3 and 6 lb/ton PAE applications have been performed. The PAE resin recovery was 95.4% with 65.0% in the sheet for the 3 lb/ton PAE-charged paper-board, and the recovery was 96.7% with 36.1% in the sheet for the 6 lb/ton PAE-charged paperboard.

Improvements in oil and grease resistance (OGR) test methodology for waterborne barrier coatings, TAPPI Journal November 2022

ABSTRACT: Paper-based food packaging is becoming more popular due to consumer demands for sustainable packaging options. Waterborne paper coatings that provide performance properties (i.e., resistance to oil and grease) not inherent to paper and board substrates offer improved sustainability profiles over earlier paper treatment options, including fluorocarbon treatment and coating with extruded plastics. The continued development of new paper coating technologies requires re-evaluation of current test methods and development of new methods to ensure lab evaluations can serve as accurate predictors of real-world performance. This paper provides an overview of commonly used oil and grease resistance (OGR) test methods within the paper coatings industry, and then describes improvements and developments made to two key methods: the 3M Kit test and an internally developed oil breakthrough test. The combined use of these adapted methods provides a more efficient testing workflow and a more complete understanding of the OGR performance of barrier coatings.

Practical Brightening for Low-pH Kraft Pulp Through In Situ Creation Of Peracetic Acid From Peracetate, 2022PEERS/IBBC Conference (22PEE/22IBB)

What's Behind the Growing Interest in Forest-Based Biofuels, How the Segment will Likely Develop and what it Means for the Forest Industry, 2008 Int'l. Bioenergy & Bioproducts Conference

What's Behind the Growing Interest in Forest-Based Biofuels, How the Segment will Likely Develop and what it Means for the Forest Industry, 2008 Int'l. Bioenergy & Bioproducts Conference

Creating value from wood -a working biorefinery, 2008 Int'l. Bioenergy & Bioproducts Conference

Creating value from wood -a working biorefinery, 2008 Int'l. Bioenergy & Bioproducts Conference

Ethanol Production--from Forest Residues via Gasification and Mixed Alcohol Synthesis, 2008 Engineering, Pulping and Environmental Conference

Ethanol Production--from Forest Residues via Gasification and Mixed Alcohol Synthesis, 2008 Engineering, Pulping and Environmental Conference

Blue Heron Paper Company, 2008 Engineering, Pulping and Environmental Conference

Blue Heron Paper Company, 2008 Engineering, Pulping and Environmental Conference

Carbon Footprints of Forest Products, 2008 Engineering, Pulping and Environmental Conference

Carbon Footprints of Forest Products, 2008 Engineering, Pulping and Environmental Conference

Combustion by Design-Practical Kiln Optimization (PowerPoint), 2008 Engineering, Pulping and Environmental Conference

Combustion by Design-Practical Kiln Optimization (PowerPoint), 2008 Engineering, Pulping and Environmental Conference