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Journal articles
Magazine articles
Open Access
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
Open Access
The role of hornification in the deterioration mechanism of physical properties of unrefined eucalyptus fibers during paper recycling, TAPPI Journal February 2024

ABSTRACT: Physical properties of cellulosic paper deteriorate significantly during paper recycling, which hinders the sustainable development of the paper industry. This work investigates the property deterioration mechanism and the role of hornification in the recycling process of unrefined eucalyptus fibers. The results showed that during the recycling process, the hornification gradually deepened, the fiber width gradually decreased, and the physical properties of the paper also gradually decreased. After five cycles of reuse, the relative bonding area decreased by 17.6%, while the relative bonding force decreased by 1.8%. Further results indicated that the physical property deterioration of the paper was closely related to the decrease of fiber bonding area. The fiber bonding area decreased linearly with the reduction of re-swollen fiber width during paper recycling. Re-swollen fiber width was closely related to the hornification. Hornification mainly reduces the bonding area of unrefined eucalyptus fiber rather than the bonding force. The work elucidates the role of hornification in the recycling process of unrefined eucalyptus fibers and the deterioration mechanism of paper physical properties, which will be helpful to control the property deterioration of paper and achieve a longer life cycle.

Journal articles
Open Access
Acid-insoluble and acid-soluble lignin characteristics in kraft pulping of hybrid salix clones, TAPPI JOURNAL August 1988

Acid-insoluble and acid-soluble lignin characteristics in kraft pulping of hybrid salix clones, TAPPI JOURNAL August 1988

Journal articles
Open Access
Nonwood fiber: Number 2, and trying harder-An interview with Dr. Joseph E. Atchison, TAPPI JOURNAL August 1988

Nonwood fiber: Number 2, and trying harder-An interview with Dr. Joseph E. Atchison, TAPPI JOURNAL August 1988

Journal articles
Open Access
Fibers properties and tearing resistance, TAPPI JOURNAL February 1988 88FEB103

Fibers properties and tearing resistance, TAPPI JOURNAL February 1988

Journal articles
Open Access
Meltblown polyester solves a food processing filtration problem, TAPPI JOURNAL February 1988 88FEB79

Meltblown polyester solves a food processing filtration problem, TAPPI JOURNAL February 1988

Journal articles
Open Access
The influence of headbox flow conditions on paper properties and their constancy, TAPPI JOURNAL February 1988 88FEB93

The influence of headbox flow conditions on paper properties and their constancy, TAPPI JOURNAL February 1988

Journal articles
Open Access
High-solids black liquor combustion-Tampella's Super Combustion system, TAPPI JOURNAL January 1988 88JAN107

High-solids black liquor combustion-Tampella's Super Combustion system, TAPPI JOURNAL January 1988

Journal articles
Open Access
Computer simulation of a material-handling and storage system, TAPPI JOURNAL July 1988

Computer simulation of a material-handling and storage system, TAPPI JOURNAL July 1988

Journal articles
Open Access
Sex, designer genes, and tree improvement, TAPPI JOURNAL July 1988

Sex, designer genes, and tree improvement, TAPPI JOURNAL July 1988

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