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Journal articles
Hydrogen-peroxide-reinforced oxygen delignification of southern pine kraft pulp and short sequence bleaching, TAPPI JOURNAL, July 1990, Vol. 73(7)
Hydrogen-peroxide-reinforced oxygen delignification of southern pine kraft pulp and short sequence bleaching, TAPPI JOURNAL, July 1990, Vol. 73(7)
Journal articles
Improvements in ecf bleaching: use of activated oxygen species and xylanase, TAPPI JOURNAL, April 1996, Vol. 79(4)
Improvements in ecf bleaching: use of activated oxygen species and xylanase, TAPPI JOURNAL, April 1996, Vol. 79(4)
Journal articles
Magazine articles
TAPPI Journal Summaries, Paper360º November/December 2020
TAPPI Journal Summaries, Paper360º November/December 2020
Journal articles
Magazine articles
Investigation of the influencing factors in odor emission from wet-end white water, TAPPI Journal October 2020
ABSTRACT: Emission of malodorous gases, such as volatile organic compounds (VOCs), hydrogen sulfide (H2S), and ammonia (NH3) during pulping and papermaking has caused certain harm to the air environment and human health. This paper investigated the influencing factors of odor emission from wet-end white water during the production of bobbin paper in a papermaking mill using old corrugated containers (OCC) as raw material. The concentration of malodorous gases emitted from wet-end white water was determined with pump-suction gas detectors. The results indicated that low temperature could limit the release of malodorous gases from white water. Specifically, no total volatile organic compounds (TVOC), H2S, and NH3 was detected at a temperature of 15°C. The concentrations of malodorous gases were slightly increased when temperature increased to 25°C. When temperature was 55°C, the released concentrations of TVOC, H2S, and NH3 were 22.3 mg/m3, 5.91 mg/m3, and 2.78 mg/m3, respectively. Therefore, the content of malodorous gases significantly increased with the temperature increase. The stirring of white water accelerated the release of malodorous gases, and the release rate sped up as the stirring speed increased. However, the total amount of malodorous gases released were basically the same as the static state. Furthermore, the higher the concentration of white water, the greater the amount of malodorous gases released. The pH had little influence on the TVOC release, whereas it significantly affected the release of H2S and NH3. With the increase of pH value, the released amount of H2S and NH3 gradually decreased. When pH reached 9.0, the release amount of H2S and NH3 was almost zero, proving that an alkaline condition inhibits the release of H2S and NH3.
Journal articles
Magazine articles
Kraft pulp viscosity as a predictor of paper strength: Its uses and abuses, TAPPI Journal October 2023
ABSTRACT: For bleached kraft pulps, two factors govern paper strength: the individual fiber strength, and the bond strength that adheres the individual fibers together in the paper matrix. Inherent fiber strength is related to the length of the carbohydrate polymers, also known as the degree of polymerization (DP). Average DP (DP) is inferred by performing pulp viscosity measurements. Under certain circumstances during kraft pulping and bleaching, the average polymer lengths can be shortened, resulting in lower pulp viscosity, and may indicate fiber damage. Fiber damage typically manifests itself as a reduction in tear strength for well-bonded handsheets.This paper will review the literature on how pulp viscosity can predict paper/fiber strength and how it can be used as a diagnostic tool. It can be a means to monitor pulp quality during pulping and bleaching, as well as to alert when such operations approach a critical threshold. However, viscosity losses must be carefully and judiciously analyzed. Like most diagnostic tools, viscosity measurements can be misused and abused, which can lead to incorrect inferences about intrinsic fiber strength. This review will also cover these misuses. The overall goal is to provide the papermaker a better understanding of what pulp viscosity is, how it correlates to potential sheet strength, and what its limitations are. It will be illustrated that when pulp viscosity drops below a critical value, it will indicate an appreciable deterioration in the paper’s tear and tensile strength.
Journal articles
Ozone, generated at the corona treater, as an adhesion promoter in extrusion coating, TAPPI JOURNAL, December 1994, Vol. 77(12)
Ozone, generated at the corona treater, as an adhesion promoter in extrusion coating, TAPPI JOURNAL, December 1994, Vol. 77(12)
Journal articles
Superheated steam drying of paper from chemithermomechanical pulp, TAPPI JOURNAL, February 1994, Vol. 77(2)
Superheated steam drying of paper from chemithermomechanical pulp, TAPPI JOURNAL, February 1994, Vol. 77(2)
Journal articles
Fuzzy logic modeling and optimization of a wood chipper, TAPPI JOURNAL, February 1994, Vol. 77(2)
Fuzzy logic modeling and optimization of a wood chipper, TAPPI JOURNAL, February 1994, Vol. 77(2)
Journal articles
Biodegradation of wood extractives from southern yellow pine by ophiostoma piliferum, TAPPI JOURNAL, January 1994, Vol. 77(1)
Biodegradation of wood extractives from southern yellow pine by ophiostoma piliferum, TAPPI JOURNAL, January 1994, Vol. 77(1)
Journal articles
Deinking laser-print paper using ultrasound, TAPPI JOURNAL, March 1994, Vol. 77(3)
Deinking laser-print paper using ultrasound, TAPPI JOURNAL, March 1994, Vol. 77(3)