Through air drying assisted by infrared radiation: the influence of radiator power on drying rates and temperature
-
Aron Tysén
,
Hannes Vomhoff
Abstract
The use of infrared radiation for heating the web in the through air drying process was investigated in lab scale. The hypothesis was that infrared radiation should be a more efficient method to transfer drying energy to the wet web compared to hot air, but that a certain air flow is still required as a transport medium for the evaporated water. A trial program comprising handsheets made of two types of bleached chemical pulps, five grammages (15, 22, 30 and 60 g/m²), and dried with five radiator power levels was performed on a lab scale through air drying equipment. Drying times of the samples were determined from temperature data recorded with an infrared camera. The use of infrared radiation shortened drying times, especially for low grammage samples. The shortening of the drying time ranged between 10 and 45 %. The most substantial shortenings were obtained for the lowest grammages and the highest radiator power level. However, the increase of power did not linearly shorten drying time. After an initial shortening at the lowest power level, the positive effect of the IR heating decreased as the power was further increased.
Funding statement: This study was performed as part of the multidisciplinary Industrial Graduate School VIPP – Values Created in Fiber Based Processes and Products – at Karlstad University, with the financial support by the Knowledge Foundation, Sweden. Additional funds were provided by the Swedish Energy Agency as part of the DryBoost 2020 project.
Acknowledgments
The authors would like to thank Ircon Drying Systems for providing the IR radiator and for fruitful discussions, Johan Wallinder for his contributions in the prestudy, and the participating companies of the Innventia Tissue Research Program for the supply of pulps.
Conflict of interest: The authors declare no conflicts of interest.
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© 2018 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Paper technology
- Through air drying assisted by infrared radiation: the influence of radiator power on drying rates and temperature
- New strength metrics for containerboards: influences of basic papermaking factors
- Selection of filler particle size for maximizing the critical properties of cellulosic paper by filler pre-flocculation
- Nanotechnology
- Detection of iron and iron-cobalt labeled cellulose nanofibrils using ICP-OES and XµCT
- Paper physics
- Variations of fiber structure and performance of ONP delinked pulp after modified-laccase/glutamate treatment
- Paper chemistry
- On-line monitoring of cationic starch gelatinization and retrogradation by 1H NMR-relaxometry
- Wet-peel: a tool for comparing wet-strength resins
- Improved dispersibility of once-dried cellulose nanofibers in the presence of glycerol
- Recycling
- Recycled fiber treated with NaOH/urea aqueous solution: effects on physical properties of paper sheets and on hornification
Artikel in diesem Heft
- Frontmatter
- Paper technology
- Through air drying assisted by infrared radiation: the influence of radiator power on drying rates and temperature
- New strength metrics for containerboards: influences of basic papermaking factors
- Selection of filler particle size for maximizing the critical properties of cellulosic paper by filler pre-flocculation
- Nanotechnology
- Detection of iron and iron-cobalt labeled cellulose nanofibrils using ICP-OES and XµCT
- Paper physics
- Variations of fiber structure and performance of ONP delinked pulp after modified-laccase/glutamate treatment
- Paper chemistry
- On-line monitoring of cationic starch gelatinization and retrogradation by 1H NMR-relaxometry
- Wet-peel: a tool for comparing wet-strength resins
- Improved dispersibility of once-dried cellulose nanofibers in the presence of glycerol
- Recycling
- Recycled fiber treated with NaOH/urea aqueous solution: effects on physical properties of paper sheets and on hornification
