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Magazine articles
Open Access
Using climate change policies for u.s. pulp and paper industry efficiency, TAPPI JOURNAL, July 2000, Vol. 83(7)

Using climate change policies for u.s. pulp and paper industry efficiency, TAPPI JOURNAL, July 2000, Vol. 83(7)

Magazine articles
Open Access
What's new with tappi test methods?, TAPPI JOURNAL, September 2000, Vol. 83(9)

What's new with tappi test methods?, TAPPI JOURNAL, September 2000, Vol. 83(9)

Magazine articles
Open Access
Advertising trends for publishers and magazines with the most ad pages, TAPPI JOURNAL, October 2000, Vol. 83(10)

Advertising trends for publishers and magazines with the most ad pages, TAPPI JOURNAL, October 2000, Vol. 83(10)

Magazine articles
Open Access
Challenges and opportunities for china's paper industry, TAPPI JOURNAL, October 2000, Vol. 83(10)

Challenges and opportunities for china's paper industry, TAPPI JOURNAL, October 2000, Vol. 83(10)

Magazine articles
Open Access
People development in research and technology organizations, TAPPI JOURNAL, October 2000, Vol. 83(10)

People development in research and technology organizations, TAPPI JOURNAL, October 2000, Vol. 83(10)

Magazine articles
Open Access
Fifth international printing and graphic arts conference: a joint success, TAPPI JOURNAL, June 1991, Vol. 74(6)

Fifth international printing and graphic arts conference: a joint success, TAPPI JOURNAL, June 1991, Vol. 74(6)

Magazine articles
Open Access
Modern management, technology, make skogn significant newsprint maker, TAPPI JOURNAL, March 1991, Vol. 74(3)

Modern management, technology, make skogn significant newsprint maker, TAPPI JOURNAL, March 1991, Vol. 74(3)

Magazine articles
Open Access
Highly corrosion-resistant metals for the pulp and paper industry, TAPPI JOURNAL, March 1991, Vol. 74(3)

Highly corrosion-resistant metals for the pulp and paper industry, TAPPI JOURNAL, March 1991, Vol. 74(3)

Journal articles
Magazine articles
Open Access
Calender barring review with experiences, TAPPI Journal July 2022

ABSTRACT: Excessive calender vibration affects all styles of calender stacks from single to multi-nip, all hard rolls, or a combination of hard and soft rolls. Calender vibration can be forced vibration or self-excited vibration. Forced vibration occurs at the first few harmonics of the calender roll rotational speeds and is caused by imbalance, misalignment, eccentricity, etc. Self-excited vibration, the focus of this paper, occurs at higher frequencies. Feedback paths for self-excited vibration must be understood in order to ameliorate the problem. This is presented in the context of the historical development of the theory of self-excited feedback mechanisms, followed by a survey of self-excited feedback mechanisms in various types of calender stacks. Methodology to determine which feed-back path is present and techniques to control or eliminate the resulting vibration follow. To obtain a flavor of the types of problems faced and practical remedial actions, a variety of experiences with barring issues are provided.

Journal articles
Magazine articles
Open Access
Numerical investigation of the effect of ultrasound on paper drying, TAPPI Journal March 2022

ABSTRACT: The paper drying process is very energy inefficient. More than two-thirds of the total energy used in a paper machine is for drying paper. Novel drying technologies, such as ultrasound (US) drying, can be assessed numerically for developing next-generation drying technologies for the paper industry. This work numerically illustrates the impact on drying process energy efficiency of US transducers installed on a two-tiered dryer section of a paper machine. Piezoelectric transducers generate ultrasound waves, and liquid water mist can be ejected from the porous media. The drying rate of handsheet paper in the presence of direct-contact US is measured experimentally, and the resultant correlation is included in the theoretical model. The drying section of a paper machine is simulated by a theoretical drying model. In the model, three scenarios are considered. In the first scenario, the US modules are positioned in the dryer pockets, while in the second scenario, they are placed upstream of the drying section right after the press section. The third case is the combination of the first and second scenarios. The average moisture content and temperature during drying, enhancement of total mass flux leaving the paper by the US mechanism, total energy consumption, and thermal effect of heated US transducers are analyzed for all cases. Results show that the application of the US can decrease the total number of dryer drums for drying paper. This numerical study is based on the US correlation obtained with the US transducer direct-contact with the paper sample. Thus, future work should include US correlation based on a non-contact US transducer.

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