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Pulp Paper & Logistics


VALMET 21


change the system to better ensure safety for customers and our employees, and to anticipate future environmental legislation. This led to the decision to invest in the development of new, safer materials for Yankee thermal spray coatings,” says Marko Heino, director of field services at Valmet. A collaborative development


team from Valmet’s hard-coatings research and development group at Jyväskylä in Finland joined with Valmet’s partners to create a team of world-class material scientists, metallurgists and manufacturing supply-chain partners.


The same performance, but without chrome The plan was to create a new generation of Yankee cylinder metallizing alloys, which had to display quality attributes at least as good as those for Valmet’s current Yankee metallizing process, but must contain no chromium-bearing constituents. Valmet Infinikote-2


Yankee Metallizing should equal or surpass the competition in all measured criteria for Yankee thermal-spray coating performance. The main goals were stable


creping surfaces while still addressing environmental and safety concerns, with the same application process and a wider application window. Key structural and surface


characteristics for optimum Yankee performance were reevaluated to ensure fundamental improvements in all crucial areas: wear and corrosion resistance, heat transfer, and surface tension. “Groundbreaking collaborative


development procedures enabled us to quickly design new alloy materials, optimise microstructures, and achieve our target performance metrics,” says Andrew Cross, senior operations manager at Valmet’s Global Yankee Services based in the UK. “This wasn’t to meet any legislative requirement


to eliminate hexavalent chromium, but it was good for the sustainability of the process. Valmet is the only company in the paper industry to offer it.” Intensive development and


exhaustive trials led to the identification of candidate materials best suited to the objectives. From these, the


final formulation for the new chromium-free thermal spray material was created. “The test results with the


new material are convincing, demonstrating significantly improved application characteristics, and meeting or exceeding all our key objectives,” says Cross.


Infinikote-2 Yankee Metallizing results: • 100 per cent chromium free • Dramatic reduction in dust production and fumes • Lower coating contamination • Superior coating structure • Greater adhesive and cohesive strength • Improved hardness Valmet Field Services provides services at customers’ sites. Yankee thermal spraying is an example of delivering field services, where safety, communication, and trust are the top priorities.


Valmet Infinikote Yankee Metallizing has been the market-leading Yankee cylinder thermal spray coating system for more than 20 years. Its strengths are hardness, durability and heat transfer. Infinikote Yankee Metallizing is not just a ‘coating’ but a patented material and application process. It provides superior tissue creping surfaces, and maintains the Yankee cylinder profile for longer, without the need for regular maintenance.


New metallizing


material produces less dust and fumes and no hexavalent chromium


July/August 2018


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