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Journal articles
Mill experience in high-consistency ozone bleaching of southern pine pulp, TAPPI JOURNAL, June 1994, Vol. 77(6)
Mill experience in high-consistency ozone bleaching of southern pine pulp, TAPPI JOURNAL, June 1994, Vol. 77(6)
Journal articles
Optimization of process variables for production of dissolvi
Optimization of process variables for production of dissolving pulps from wheat straw and hemp, TAPPI JOURNAL, June 1994, Vol. 77(6)
Journal articles
Characteristics of paper handsheets after combined biologica
Characteristics of paper handsheets after combined biological pretreatments and conventional pulping of wheat straw, TAPPI JOURNAL, June 1994, Vol. 77(6)
Journal articles
Mechanism of paper tensile-strength development due to pulp
Mechanism of paper tensile-strength development due to pulp beating, TAPPI JOURNAL, June 1994, Vol. 77(6)
Journal articles
A limited consistency model for pulp dewatering and wet pres
A limited consistency model for pulp dewatering and wet pressing, TAPPI JOURNAL, June 1994, Vol. 77(6)
Journal articles
Bleaching of softwood kraft pulps with the enzone process, TAPPI JOURNAL, March 1994, Vol. 77(3)
Bleaching of softwood kraft pulps with the enzone process, TAPPI JOURNAL, March 1994, Vol. 77(3)
Journal articles
Biofiltration of a-pinene and its application to the treatment of pulp and paper air emissions, TAPPI JOURNAL, August 1998, Vol. 81(8)
Biofiltration of a-pinene and its application to the treatment of pulp and paper air emissions, TAPPI JOURNAL, August 1998, Vol. 81(8)
Journal articles
Filtration performance of face masks and facepiece respirators used during COVID-19 pandemic, TAPPI Journal February 2025
ABSTRACT: The rapid spread of SARS-CoV-2 has created challenges for societies, healthcare settings, businesses, and institutions. To curb virus transmission, various measures like lockdown, social distancing, hand hygiene, and using appropriate personal protective equipment (PPEs), including face masks, have been recommended. Face masks and facepiece respirators are considered to act as barriers against microbial transmission from person to person. In this study, we selected barrier materials used during the COVID-19 pandemic that included four non-medical face masks and three facepiece respirators. Facepiece respirators were distributed by the U.S. Administration through pharmacy outlets. Results showed that facepiece respirator R95 has the highest filtration efficiency (above 99%), which remains more or less the same over different particle sizes. The N95 respirator’s filtration efficiency was lower than that of R95, but its barrier resistance was lower than that of the R95, indicating that it can be comfortably used over longer duration. Face masks were evaluated using ASTM F 3502-24 for their barrier performance. At 0.1 and 0.3 ìm particle size, domestically manufactured masks met the standard for higher performance. Interestingly, the results indicate that quality of raw materials and manufacturing standards play important roles, as is evident in domestically manufactured face mask and facepiece respirators.
Journal articles
Comparison of the application of polysaccharide-based barrier coatings on paper using film press and spray coating, TAPPI Journal January 2025
The growing demand for sustainable packaging has spurred research into biopolymer-based solutions and their application to paper substrates. This study compares the application of low solids, high viscous aqueous solutions of alginate and chitosan on two different paper substrates using a laboratory film press coater and a purpose-built spray coating unit, with a focus on barrier performance and practical industry considerations. Key parameters investigated are air flow rate, water vapor transmission rate, and grease resistance. Results showed that due to the low solids content of the applied biopolymer solutions, film press coating required a double-layer application for coat weights exceeding 4 g/m², making it less viable for industrial application. In contrast, spray coating allowed for higher application weights in a single step. The barrier properties of spray coated samples, compared to film press coatings, varied with the paper substrate: spray coating performed better on one substrate and worse on the other. Contact angle measurement of the substrates suggested that spray coating is more suitable for a more hydrophilic substrate because of improved surface wetting. The study also identified issues with drying conditions and pinholes affecting the quality of spray coated samples, indicating a need for further research to optimize these parameters.
Journal articles
Water-based adhesive penetration into paperboard and coated paperboard, TAPPI Journal January 2025
The setting of water-based adhesives in contact with paperboard is important in the production of boxes and other packaging, but the topic has received little attention in the literature. The penetration of the adhesive into the paper surface is important to get good bond strength through mechanical interlocking. The influence of the process conditions and the paper properties on this penetration is lacking. A water-based adhesive was applied to an uncoated and coated paperboard. The coating layer had two latex levels. Samples were characterized in terms of air permeability, void fraction, average pore size, and coat weight. The adhesive was applied to the samples in a mechanical press, squeezing a drop between two samples. The penetration of the adhesive was characterized with a silicone oil absorption method that measured the decrease in pore volume after the adhesive had been applied to approximate the pore volume taken up by the adhesive. The bond strength was measured with a peeling test. The penetration depth into uncoated paper did not depend on the application method parameters such as pressing time, pressure, or initial solids of the adhesive. The penetration depth ranged from 35•40 mm. The penetration into 10 pph latex content coated paper was similar to the uncoated samples, but reduced penetration was observed into the 40 pph latex content coatings. The results were compared to the limiting amount of adhesive that was obtained from the weight gain of the samples and to a simple model that is based on flow in porous media. Peel tests revealed that good penetration was needed, as well as a strong coating layer to obtain high peel forces.