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Magazine articles
Temperature profile measurement applications of moving webs and roll structures with intelligent roll embedded sensor technology
ABSTRACT: An intelligent roll for sheet and roll cover temperature profiles is a mechatronic system consisting of a roll in a web handling machine that is also used as a transducer for sensing cross-machine direction (CD) profiles. The embedded temperature sensor strips are mounted under or inside the roll cover, covering the full width of the roll’s cross-dimensional length. The sensor system offers new opportunities for online temperature measurement through exceptional sensitivity and resolution, without adding external measurement devices. The measurement is contacting, making it free from various disturbances affecting non-contacting temperature measurements, and it can show the roll cover’s internal temperatures. This helps create applications that have been impossible with traditional technology, with opportunities for process control and condition monitoring. An application used for process analysis services without adding a roll cover is made with “iRoll Portable Temperature” by mounting the sensor on the shell in a helical arrangement with special taping. The iRoll Temperature sensors are used for various purposes, depending on the application. The two main targets are the online temperature profile measurement of the moving web and the monitoring of the roll covers’ internal temperatures. The online sheet temperature profile has its main utilization in optimizing moisture profiles and drying processes. This enables the removal of speed and runnability bottlenecks by detecting inadequate drying capacity across the sheet CD width, the monitoring condition of the drying equipment, the optimization of drying energy consumption, the prevention of unnecessary over-drying, the optimization of the float drying of coating colors, and the detection of reasons for moisture profile errors. This paper describes this novel technology and its use cases in the paper, board, and tissue industry, but the application can be extended to pulp drying and industries outside pulp and paper, such as the converting and manufacture of plastic films.
Journal articles
Magazine articles
Application of spruce wood flour as a cellulosic-based wood additive for recycled paper applications— A pilot paper machine study, TAPPI Journal October 2021
ABSTRACT: This study gives a first insight into the use of wood flour as a plant-based and cellulosic-based alter-native additive for newsprint and paperboard production using 100% recycled fibers as a raw material. The study compares four varieties of a spruce wood flour product serving as cellulosic-based additives at addition rates of 2%, 4%, and 6% during operation of a 12-in. laboratory pilot paper machine. Strength properties of the produced news-print and linerboard products were analyzed. Results suggested that spruce wood flour as a cellulosic-based additive represents a promising approach for improving physical properties of paper and linerboard products made from 100% recycled fiber content. This study shows that wood flour pretreated with a plant-based polysaccharide and untreated spruce wood flour product with a particle size range of 20 μm to 40 μm and 40 μm to 70 μm can increase the bulk and tensile properties in newsprint and linerboard applications.
Journal articles
Magazine articles
Evaluation of rice straw for purification of lovastatin, TAPPI Journal November 2021
ABSTRACT: Cholesterol synthesis in the human body can be catalyzed by the coenzyme HMG-CoA reductase, and lovastatin, a key enzyme inhibitor, can reduce hypercholesterolemia. Lovastatin can be obtained as a secondary metabolite of Aspergillus terreus ATCC 20542. In this study, rice straw of lignocellulose was used in aeration and agitation bath fermentation in a 1-L flask, and a maximal crude extraction rate of 473 mg/L lovastatin was obtained. The crude extract was treated with silica gel (230–400 mesh) column chromatography. Ethyl acetate/ethanol (95%) was used as the mobile phase, and isolation was performed through elution with various ethyl acetate/ethanol ratios. The highest production rate of 153 mg/L was achieved with ethyl acetate/ethanol in a ratio of 8:2. The lovastatin gained from the crude extract was added to 12 fractions treated with 0.001 N alkali, and acetone was then added. After 24 h of recrystallization at 4°C, the extract underwent high-performance liquid chromatography. The purity had increased from 25% to 84.6%, and the recovery rate was 65.2%.
Journal articles
Improvement of linerboard properties by condebelt drying, TAPPI JOURNAL, July 2000, Vol. 83(7)
Improvement of linerboard properties by condebelt drying, TAPPI JOURNAL, July 2000, Vol. 83(7)
Journal articles
Investing in the future of your mill, TAPPI JOURNAL, July 2000, Vol. 83(7)
Investing in the future of your mill, TAPPI JOURNAL, July 2000, Vol. 83(7)
Journal articles
The influence of formation on tensile strength of paper made from mechanical pulps, TAPPI JOURNAL, December 2000, Vol. 83(12)
The influence of formation on tensile strength of paper made from mechanical pulps, TAPPI JOURNAL, December 2000, Vol. 83(12)
Journal articles
Organizing for speed: an essential component for value delivery, TAPPI JOURNAL, December 2000, Vol. 83(12)
Organizing for speed: an essential component for value delivery, TAPPI JOURNAL, December 2000, Vol. 83(12)
Journal articles
Mixing intensity analysis of a 2-layer stratified headbox jet, TAPPI JOURNAL, December 2000, Vol. 83(12)
Mixing intensity analysis of a 2-layer stratified headbox jet, TAPPI JOURNAL, December 2000, Vol. 83(12)
Journal articles
Biological destruction of haps for cluster rule compliance, TAPPI JOURNAL, December 2000, Vol. 83(12)
Biological destruction of haps for cluster rule compliance, TAPPI JOURNAL, December 2000, Vol. 83(12)
Journal articles
Deinking of newspaper assisted by steam explosion, TAPPI JOURNAL, December 2000, Vol. 83(12)
Deinking of newspaper assisted by steam explosion, TAPPI JOURNAL, December 2000, Vol. 83(12)