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Continuous tannin extraction by use of screw reactor, TAPPI Journal February 2021
ABSTRACT: A pilot-size screw reactor (extraction unit) was used for tannin extraction of spruce. Yield of the same magnitude or better was obtained when comparing a screw reactor with batch reactors. A longer presoaking time in water seemed to be better than a short one for obtaining higher yield. A higher yield is obtained with lower dry-water ratio, which suggests that the internal diffusion in bark does not determine mass transfer as much as is the case without presoaking of bark. The higher dry-water ratio decreased the yield. The prior soaking of the bark also minimized the mechanical reactor feeding problems (clogging). The benefits of a screw reactor likely are that run time changes for different process conditions are flexible; it simplifies design and construction of an industrial unit for tannin production; and it saves space because of the need for fewer and smaller intermediate storage tanks.
Journal articles
Magazine articles
Guest Editorial: Research and development in the post COVID-19 era, TAPPI Journal June 2021
Science and technology occupy prominent roles in solving global problems. The ongoing COVID-19 pandemic has reinforced the importance of science regarding decision-making, saving lives, and safeguarding the environment. While information technology (IT) and IT-based tools have garnered much needed attention in the past few decades, other areas such as manufacturing engineering, biotechnology, and pharmaceuticals are finding their right places in gaining public and political support and attention--thanks to COVID-19! Such public attention has highlighted vulnerabilities due to lack of investments in manufacturing and materials engineering, as well as the need for strategic investments in these areas.
Journal articles
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Evaluating hardness and the S-test, TAPPI Journal March 2019
ABSTRACT: The corrugated industry typically quantifies crush resistance using the Concora corrugated medium test (CMT) on fluted medium or flat crush on combined board. These tests compress the materials until the point of complete failure of the flutes. Combined board elastically resists crushing forces until a certain point, the hardness of the structure, while additional load causes permanent damage and deformation. This study investigates how hardness can be measured directly from a load curve collected during CMT (or flat crush) testing and how it varies throughout the North American paper supply. It also explores how hardness corre-lates with the values obtained from the newly developed S-test. This new test method deserves further study as a potentially more appropriate specification for crush resistance of corrugated medium.
Journal articles
Magazine articles
Effect of ring formation on burner flame stability in lime kilns, TAPPI JOURNAL May 2018
Effect of ring formation on burner flame stability in lime kilns, TAPPI JOURNAL May 2018
Journal articles
Magazine articles
Improving the inkjet codability of folding boxboard, TAPPI Journal February 2019
Improving the inkjet codability of folding boxboard, TAPPI Journal February 2019
Journal articles
Magazine articles
Effect of pH and enzymes on strength of recycled fibers during refining, TAPPI JOURNAL July 2018
Effect of pH and enzymes on strength of recycled fibers during refining, TAPPI JOURNAL July 2018
Journal articles
Magazine articles
Editorial: Foam forming: Technology of many opportunities, TAPPI JOURNAL August 2019
ABSTRACT: Over the past ten years, the forest sector has faced big changes due to the decreased demand of printing papers and the fast growth in packaging and tissue products. Weekly news on the marine waste problem and global warming have raised public awareness and stimulated increased interest in bio-based materials, chemicals, and fuels.
Journal articles
Magazine articles
Editorial: Nanocellulose: What's next?
Many of the researchers in this field in the late 1990s and early 2000s were challenged in terms of translation research issues due to the limited production capacity of nanocellulosics on a global stage. To address this call, several pilot-plant production plants have been developed and can now deliver NC on multikilo/ton scale as these issues are gradually being resolved.
Journal articles
Magazine articles
Evaluation of the out-of-plane response of fiber networks with a representative volume element model, TAPPI JOURNAL June 2018
Evaluation of the out-of-plane response of fiber networks with a representative volume element model, TAPPI JOURNAL June 2018
Journal articles
Magazine articles
Effects of lignin chemistry on oxygen delignification performance, TAPPI JOURNAL July 2018
Effects of lignin chemistry on oxygen delignification performance, TAPPI JOURNAL July 2018
