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Editorial: Vipin Varma joins TJ Editorial Board as expert on environmental and sustainability topics, TAPPI Journal October 2022

ABSTRACT: TAPPI and the TAPPI JOURNAL (TJ) editorial staff would like to welcome a new member to the TJ Editorial Board, Vipin Varma, Ph.D., who is vice president, Manufacturing Programs, at the National Council of Air and Stream Improvement (NCASI), headquartered in Cary, NC, USA. NCASI develops technical information that is critical for forest products companies to meet and surpass their environmental and sustainability goals. Vipin will provide expertise on environmental, sustainability, air emissions, and water topics relevant to the pulp and paper industry. In his position on the TJ Editorial Board, he succeeds Paul Wiegand, NCASI’s vice president for Water and Chemical Management Programs, who served from 2007 to 2022.

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A new method of studying the fundamental mechanisms involved in pigment liberation from recycle papers, TAPPI Journal October 2022

ABSTRACT: Deinking flotation is the most efficient and widely used method of removing ink particles from printed papers to improve the recyclability. A prerequisite for successful deinking flotation is detachment of pigments from paper fibers, a subprocess known as liberation. The degree of liberation is usually determined via hyperwashing tests, which are costly and time consuming. Furthermore, they provide no information on the fundamental mechanisms controlling liberation. In the present work, we developed a new method in which ?-potentials of the particles in a pulp are measured and analyzed. If pigments are not liberated from paper fibers, a frequency distribution plot gives a single peak, while two peaks appear when they are liberated. One can readily determine the degrees of liberation from the peak positions and peak heights. In addition, the ?-potential data can be used to construct disjoining pressure isotherms using the DLVO theory that are useful to better understand the fundamental mechanisms involved and the roles of different reagents used to improve pigment liberation.

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Effects of orders of addition in nanocellulose•cationic starch• colloidal silica systems for papermaking, TAPPI Journal October 2022

ABSTRACT: Two orders of addition were compared when preparing paper handsheets from recycled copy paper furnish in combination with nanofibrillated cellulose (NFC), cationic starch, colloidal silica, and cationic retention aid (cPAM; cationic polyacrylamide). Faster dewatering and higher fine-particle retention were obtained at equal optimized dosages of additives when the colloidal silica was added last, after addition of the cPAM. The same order of addition also provided a higher gain in the paper’s tensile strength. However, higher paper stiffness was achieved when the colloidal silica was instead added to the NFC, after its pretreatment with cationic starch. Results were consistent with the principle that papermaking additives added shortly before sheetforming tend to have the largest effects on drainage and retention. The results also demonstrated a sensitivity to the relative dosages of positively and negatively charged additives.

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Editor's Note: Recovery Boiler Insights, TAPPI JOURNAL Febru

Editor's Note: Recovery Boiler Insights, TAPPI JOURNAL February 2010

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Editor's Note: An Ideal Raw Material for Pulp and Paper, TAP

Editor's Note: An Ideal Raw Material for Pulp and Paper, TAPPI JOURNAL March 2010

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Guest Editorial: Recognizing excellence in recycling, TAPPI

Guest Editorial: Recognizing excellence in recycling, TAPPI JOURNAL February 2012

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The influence of strain rate and pulp properties on the stre

The influence of strain rate and pulp properties on the stress-strain curve and relaxation rate of wet paper, TAPPI JOURNAL August 2015

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Editorial: Art Ragauskas: Eyes on the future, TAPPI JOURNAL

Editorial: Art Ragauskas: Eyes on the future, TAPPI JOURNAL October 2012

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Editor's Note: Great expectations, TAPPI JOURNAL January 201

Editor's Note: Great expectations, TAPPI JOURNAL January 2011

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Open Access
Editorial: Celebrating an industry giant: Dr. Peter W. Hart, TAPPI Journal April 2024

ABSTRACT: On February 19, 1915, at the annual meeting of the American Paper and Pulp Association held at the Waldorf-Astoria Hotel in New York, a group of 35 people formed a new division called the “Technical Section of the American Paper and Pulp Association” with the objectives to: (1) stimulate interest in the science of pulp and papermaking; (2) provide means for the inter-change of ideas among its members; and (3) encourage original investigation. At that meeting, Professor Ralph H. McKee of the University of Maine (1909-1916) spoke. Professor McKee had initiated the first college course in Pulp and Paper in the United States. In his remarks he stated:

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