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Journal articles
Impact of high chlorine dioxide substitution on oxygen delig
Impact of high chlorine dioxide substitution on oxygen delignified pulp, TAPPI JOURNAL, May 1990, Vol. 73(5)
Journal articles
Double-backer bonding technology, TAPPI JOURNAL, May 1990, V
Double-backer bonding technology, TAPPI JOURNAL, May 1990, Vol. 73(5)
Journal articles
High-magnification cryogenic-scanning electron microscopy (c
High-magnification cryogenic-scanning electron microscopy (cryo-sems) of wet coating microstructures, TAPPI JOURNAL, May 1990, Vol. 73(5)
Journal articles
The use of x-ray image processing to analyze the z-direction distribution of fillers and pigments, TAPPI JOURNAL, May 1990, Vol. 73(5)
The use of x-ray image processing to analyze the z-direction distribution of fillers and pigments, TAPPI JOURNAL, May 1990, Vol. 73(5)
Journal articles
Biomechanical pulping of aspen chips: energy savings resulti
Biomechanical pulping of aspen chips: energy savings resulting from different fungal treatments, TAPPI JOURNAL, May 1990, Vol. 73(5)
Journal articles
Rapid secondary analysis of lignocellulose: comparison of ne
Rapid secondary analysis of lignocellulose: comparison of near infrared and fourier transform infrared (ftir), TAPPI JOURNAL, May 1990, Vol. 73(5)
Journal articles
Guidelines for selecting uhle-box slot width, TAPPI JOURNAL,
Guidelines for selecting uhle-box slot width, TAPPI JOURNAL, May 1990, Vol. 73(5)
Journal articles
Exploratory study on how sub-ply fiber orientation affects t
ABSTRACT: The transition to 100% biobased packaging presents considerable challenges, particularly in the development of a petroleum-free barrier. Generally, biobased barriers exhibit lower flexibility compared to traditional barriers, thereby increasing the risk of cracking during the converting process. The present study examines the possibility of optimizing the substrate to reduce cracking in brittle barriers. Five three-ply composites were fabricated using commercial paperboard to enable a composite with different fiber orientation in the individual plies. The different orientations achieved varying mechanical properties, including strain-atbreak and folding resistance, with a ranking that is comparable to a standard multi-ply paperboard. The composites were subjected to creasing at five distinct depths to assess the area percent of barrier cracks across the crease bead. Micro-cracks appeared on the surface before larger coating cracks were registered. As expected, the area percent of barrier cracks increased significantly with greater creasing depths. The orientation of the bulky middle ply showed little difference in the cracking propensity. However, by replacing the stiffer bottom ply with a ply of lower stiffness, the cracking propensity was significantly reduced without a substantial loss in mechanical properties. Hence, these findings indicate that it is possible to reduce the cracks in the barrier by modifying the fiber orientation in the different plies.
Journal articles
Improving barrier performance of coated paper and paperboard
ABSTRACT: Market demand for barrier coated packaging paper and paperboard has been on a steady rise and is forecasted to further increase. As a result, there is a continued interest in improving barrier coating functionalities, which is currently an active area of investigation. In this work, a multi-layer approach was adopted that involved applying a biowax emulsion, latex, or a combination of biowax and latex top coating layer onto the kaolin/latex (20/80, 50/50, 65/35, or 70/30) precoated solid bleached sulfate (SBS) paperboard. Our main objective was to demonstrate the effect of these top coating layers on various barrier properties, especially water vapor transmission rate (WVTR) at high relative humidity (RH) and high temperature (90% RH; 38°C), known as tropical/jungle test conditions. While the top coat with latex and/or biowax showed dramatic improvement in both water resistance (Cobb) and WVTR, the biowax coating increased contact angle significantly compared to the latex top coat. Contact angle increased from about 65° for the latex top coat to as high as 96° for the biowax top coat. Generally, it is much more difficult to improve WVTR at the jungle conditions below 100 g/m2/day, even with the high aspect ratio platy pigment. However, using the coating strategies adopted in this study, we were able to achieve WVTR values notably below 50 g/m2/day at the tropical test conditions, as well as significant improvements in regard to fold crack barrier integrity at high kaolin clay usage.
Journal articles
Editorial: Honoring the contributions of Dr. Mahendra Doshi
n this column, we would like to recognize the contributions to TAPPI and TAPPI Journal made by Dr. Mahendra Doshi, who passed away in April. A long-time member of TAPPI and a TAPPI Journal Editorial Board Member for many years, he is recognized for his research in screening system analysis, wax, and stickies removal in the field of recycling. Doshi was a pioneer in stickies classification and measurement methods for macro and micro stickies. During his career, he consulted with paper mills all over the world, providing mills with solutions for deinking, wax, stickies, yield, dirt count, and brightness.