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Use of kaolin clay in aqueous barrier coating applications, TAPPI Journal November 2023
ABSTRACT: Paper-based packaging with barrier effect, as opposed to single use plastics, is gaining more prominence for sustainability reasons. At the same time, latex- or biopolymer-based aqueous barrier coating dispersions are increasingly being adopted as a better alternative to the traditional barrier coating materials, such as wax, surface active chemicals, and polyethylene. In this work, studies were performed to determine the influence of different kaolin clays in latex binder-based aqueous coatings on barrier properties, namely, oil and grease, water resistance, and water vapor transmission rate, by applying coatings to solid bleached sulfate (SBS) paperboard substrate in the laboratory. The aim was to explore potential benefits of using kaolin clay to replace some of the latex binder in coating and improve or maintain various types of barrier performance and blocking without negatively influencing the other performance attributes, including heat seal. The delaminated clay with the highest shape factor provided improved barrier properties over the clays of low shape factor. The ultrafine and non-delaminated clays required significantly higher coat weights to reach satisfactory barrier properties. Coatings with different latex levels indicated that a considerably high proportion of coarse delaminated clay can be incorporated to replace latex binder, while still achieving exceptional barrier properties. Furthermore, a change in binder system was found to significantly alter the barrier properties and the role that a mineral pigment can play. The results indicate that a proper selection of binder systems for each barrier property would be required while considering the clay/latex coating systems.
Journal articles
Magazine articles
Kraft pulp viscosity as a predictor of paper strength: Its uses and abuses, TAPPI Journal October 2023
ABSTRACT: For bleached kraft pulps, two factors govern paper strength: the individual fiber strength, and the bond strength that adheres the individual fibers together in the paper matrix. Inherent fiber strength is related to the length of the carbohydrate polymers, also known as the degree of polymerization (DP). Average DP (DP) is inferred by performing pulp viscosity measurements. Under certain circumstances during kraft pulping and bleaching, the average polymer lengths can be shortened, resulting in lower pulp viscosity, and may indicate fiber damage. Fiber damage typically manifests itself as a reduction in tear strength for well-bonded handsheets.This paper will review the literature on how pulp viscosity can predict paper/fiber strength and how it can be used as a diagnostic tool. It can be a means to monitor pulp quality during pulping and bleaching, as well as to alert when such operations approach a critical threshold. However, viscosity losses must be carefully and judiciously analyzed. Like most diagnostic tools, viscosity measurements can be misused and abused, which can lead to incorrect inferences about intrinsic fiber strength. This review will also cover these misuses. The overall goal is to provide the papermaker a better understanding of what pulp viscosity is, how it correlates to potential sheet strength, and what its limitations are. It will be illustrated that when pulp viscosity drops below a critical value, it will indicate an appreciable deterioration in the paper’s tear and tensile strength.
Journal articles
Papermaking Potential of Novel Structured PCC Fillers with Enhanced Refractive Index, TAPPI JOURNAL January 2010
Papermaking Potential of Novel Structured PCC Fillers with Enhanced Refractive Index, TAPPI JOURNAL January 2010
Journal articles
Calendering Effects on Coating Pore Structure and Ink Setting Behavior, TAPPI JOURNAL January 2010
Calendering Effects on Coating Pore Structure and Ink Setting Behavior, TAPPI JOURNAL January 2010
Journal articles
Improving anaerobic conversion of pulp mill secondary sludge to biogas by pretreatment, TAPPI JOURNAL June 2010
Improving anaerobic conversion of pulp mill secondary sludge to biogas by pretreatment, TAPPI JOURNAL June 2010
Journal articles
Comparison of ultraviolet inkjet printing on different synth
Comparison of ultraviolet inkjet printing on different synthetic fibrous papers, TAPPI JOURNAL May 2010
Journal articles
A new method for quantifying \ the blocking of coated paperboard, TAPPI JOURNAL May 2010
A new method for quantifying \ the blocking of coated paperboard, TAPPI JOURNAL May 2010
Journal articles
Changes with aging in the surface hydrophobicity of coated paper, TAPPI JOURNAL May 2010
Changes with aging in the surface hydrophobicity of coated paper, TAPPI JOURNAL May 2010
Journal articles
Effect of ink and paperboard characteristics on flexographic
Effect of ink and paperboard characteristics on flexographic print quality based on print density, TAPPI JOURNAL September 2011
Journal articles
Z-direction fiber orientation in paperboard, TAPPI JOURNAL October 2010
Z-direction fiber orientation in paperboard, TAPPI JOURNAL October 2010