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H. Jungklaus
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Proceedings Papers
High End Hard Metal Coatings for the Toughest Demand in Paper Industry
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ITSC 2022, Thermal Spray 2022: Proceedings from the International Thermal Spray Conference, 179-188, May 4–6, 2022,
Abstract
View Papertitled, High End Hard Metal Coatings for the Toughest Demand in Paper Industry
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Raising demands in industry lead to the request of different and better paper quality. New paper types like e.g., liquid food packaging (lfp) will replace former solutions like Tetrapak, magazine papers will be produced much cheaper on different machine designs. Since certain paper properties like roughness, printability, … still remain or step up in quality level. One machine component influencing the paper properties strongly is the calender with its extremely hard, coated roll surfaces. The hard metal coating on the calender rolls can determine the later paper quality significantly. The current work describes investigations on certain WC based HVOF coatings, which later will be in contact with the paper under high temperatures, extremely high load, and steam environment. Coating design from carbide particle size, metal matrix and other factors like apparent density and sintering grade were studied under real life influences. The various coating versions were compared in a slurry test using the same fines as added in the paper production process for increasing brightness and tear strength. Interesting results are discussed on technical, but also economical basis.
Proceedings Papers
Anti-Adhesive, High Wear Resistant Coatings for the Paper Industry
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ITSC 2015, Thermal Spray 2015: Proceedings from the International Thermal Spray Conference, 902-910, May 11–14, 2015,
Abstract
View Papertitled, Anti-Adhesive, High Wear Resistant Coatings for the Paper Industry
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for content titled, Anti-Adhesive, High Wear Resistant Coatings for the Paper Industry
Raising demands in industry lead to the request of better and enhanced functional surfaces, also on rolls parts in paper producing machines. Due to the higher usage of post-consumer recycled fibers on paper machines the run ability and machine cleanliness become a major issue. On one hand the contaminates called stickies can be responsible for sheet brakes, holes in the paper, web picking etc. On the other hand more sand containing waste paper enhances the impact on roll surfaces in operation. In this paper the different stickies (micro / macro / primary / secondary) and their impact on the paper production will be explained and the development to avoid stickies and contaminations together with high wear resistant coatings on roll surfaces in the paper machinery will be shown. Therefore a comparison of different materials and technologies regarding surface energy and peel force measurements are explained. Together with results of a pilot scale blade test rig the results in the market regarding anti stick properties wear resistance and corrosion resistance of the developed layer stack designs will be introduced.
Proceedings Papers
Improved Efficiency in Paper Making by Thermal Spray Coatings
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ITSC2014, Thermal Spray 2014: Proceedings from the International Thermal Spray Conference, 345-348, May 21–23, 2014,
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View Papertitled, Improved Efficiency in Paper Making by Thermal Spray Coatings
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This paper discusses the different types of rolls used in paper machines, the functions and performance required of them, and recent improvements achieved with the aid of thermal spray coatings. It presents examples showing how metal and ceramic coatings applied by HVOF and plasma spraying have reduced operating expenses and extended roll life by stabilizing and improving various surface properties.
Proceedings Papers
Thermal Spray Coatings in Printing and Papermaking
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ITSC 2008, Thermal Spray 2008: Proceedings from the International Thermal Spray Conference, 195-199, June 2–4, 2008,
Abstract
View Papertitled, Thermal Spray Coatings in Printing and Papermaking
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for content titled, Thermal Spray Coatings in Printing and Papermaking
The effects of globalization, technology improvement, capacity consolidation, and rising customer demands drive the printing and papermaking business worldwide. Consumption of paper, paperboard, and tissue exceeded 500 million tons in 2007, and it is estimated that one-third to one-half of this production is printed. Paper production in total is not experiencing drastic growth rates due to the increasing market share of digital media; however, market segments such as paperboard and packaging are showing growing demand. In printing, new technologies focus on production speed and quality improvement. For both printing and papermaking, the cost of energy and raw materials requires ongoing improvements in production efficiency. For equipment and machinery manufacturers serving these industries, high-end technology that lowers cost and improves quality drives the market leaders. In both industries, functional roll surfaces generated by thermal spraying help to achieve design and development objectives. The paper gives examples for the role of thermal spray coatings in both industrial areas.
Proceedings Papers
Tailored Solutions for Off-Shore Applications by Plazjet Sprayed Coatings
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ITSC1997, Thermal Spray 1997: Proceedings from the United Thermal Spray Conference, 175-181, September 15–18, 1997,
Abstract
View Papertitled, Tailored Solutions for Off-Shore Applications by Plazjet Sprayed Coatings
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for content titled, Tailored Solutions for Off-Shore Applications by Plazjet Sprayed Coatings
For very large structures and parts in critical environments, a materials solution often cannot be found by using one material. The specific desired properties for those structures, like stiffness, ductility, high temperature stability, corrosion resistance, etc. are difficult to fulfill with only one material. In this case a solution may be found by using coatings and design their specific properties to replenish each other by their combination. The Thermal Spraying processes offer the necessary flexibility of producing thin to thick, ductile, soft to hard coatings while due to the wide range of process temperatures it is possible to process a wide range of materials, both as coating and structure. In this paper the some recent and important developments in Thermal Spraying to produce coatings for technical demanding structures will be described. These developments consist of High Power Plasma Spraying, powder- and process control development. To ensure process consistency during long spraying times and to apply reproducible coating quality a suitable process control is of great importance and the development of temperature control by Pyrometry and Thermography will be presented. The example will be drawn according to the application of a coating on a ball valve for off-shore and ship diesel engine parts (piston and valve).