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Overview of New Developments in Pulping and Bleaching, 1992 PapFor Conference Proceedings

Overview of New Developments in Pulping and Bleaching, 1992 PapFor Conference Proceedings

Developing a New Paper Grade, 1999 International Mechanical Pulping Conference Proceedings

Developing a New Paper Grade, 1999 International Mechanical Pulping Conference Proceedings

A new method of studying the fundamental mechanisms involved in pigment liberation from recycle papers, TAPPI Journal October 2022

ABSTRACT: Deinking flotation is the most efficient and widely used method of removing ink particles from printed papers to improve the recyclability. A prerequisite for successful deinking flotation is detachment of pigments from paper fibers, a subprocess known as liberation. The degree of liberation is usually determined via hyperwashing tests, which are costly and time consuming. Furthermore, they provide no information on the fundamental mechanisms controlling liberation. In the present work, we developed a new method in which ?-potentials of the particles in a pulp are measured and analyzed. If pigments are not liberated from paper fibers, a frequency distribution plot gives a single peak, while two peaks appear when they are liberated. One can readily determine the degrees of liberation from the peak positions and peak heights. In addition, the ?-potential data can be used to construct disjoining pressure isotherms using the DLVO theory that are useful to better understand the fundamental mechanisms involved and the roles of different reagents used to improve pigment liberation.

Effects of orders of addition in nanocellulose•cationic starch• colloidal silica systems for papermaking, TAPPI Journal October 2022

ABSTRACT: Two orders of addition were compared when preparing paper handsheets from recycled copy paper furnish in combination with nanofibrillated cellulose (NFC), cationic starch, colloidal silica, and cationic retention aid (cPAM; cationic polyacrylamide). Faster dewatering and higher fine-particle retention were obtained at equal optimized dosages of additives when the colloidal silica was added last, after addition of the cPAM. The same order of addition also provided a higher gain in the paper’s tensile strength. However, higher paper stiffness was achieved when the colloidal silica was instead added to the NFC, after its pretreatment with cationic starch. Results were consistent with the principle that papermaking additives added shortly before sheetforming tend to have the largest effects on drainage and retention. The results also demonstrated a sensitivity to the relative dosages of positively and negatively charged additives.

MODELING CONSIDERATIONS FOR STOCK FLOW USING HYDRAULIC MODELING SOFTWARE, 2022PEERS/IBBC Conference (22PEE/22IBB)

Rotary Kiln Monitoring with Shell Temperature Visualization and Process Analytics, 2022PEERS/IBBC Conference (22PEE/22IBB)

Labeled Cellulose for EHS Studies, TAPPICon25

An Alternative Quantitative Method of Image Analysis of Rub Tested Printed Packaging (Coating, Printing and Surface Enhancement), TAPPICon25

Sweetening and Intermediate Liquor Impacts on Evaporator Performance, TAPPICon25

Change Management in Digital Transformation: Key Strategies for Successful Implementation, TAPPICon25