OptiCoat Jet coating provides very uniform and skipfree coating quality. It gives the best possible surface smoothness compared to any other coating method. OptiCoat Jet coating station applies a surplus coating layer to paperboard surface with jet nozzles. The excess coating is scraped away by metering blade and returned on a return plate to the color collection pan. The desired coatweight is achieved by adjusting the angle or pressure of the blade.The impingement pressure is maximized with closed nozzle geometry.
Uniform coating quality
Fast start-up and web break recovery
Easy maintenance & operation
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OptiCoat Jet produces high quality coating on paper and board in both cross and machine direction. High quality backing roll is one of the reasons for reduced MD coatweight variation. Skipfree coating is a result of a very effective de-aeration in color circulation. The application method and cross direction control capabilities are important for uniform application and excellent CD profiles.
All Valmet coating stations are fully pretested in workshop. The instrumentation and controls are integrated in the machine and all the controls located by the station frame. The interface and automation systems are user-friendly. After web breaks, coating can be re-started fast. Tailthreading is fast and reliable. A wide operating window enables good surface quality almost immediately after the coating is started.
Because of a wide operating window, coating quality is easily maintained high when speeding up the machine. The wide window and operator friendly automation facilitate finding the correct parameters for each paper or board grade. Clean coating process and easy wash-up speed up the maintaining operations.
Jet application is contactless resulting less breaks. Runnability is also improved because of a smaller doctor blade load compared to other application methods. Jet application also has excellent efficiency even at very high speeds.
Even better, more stable profiles with OptiCoat Jet at Sappi Alfeld
Sappi Alfeld in Germany is among the first to use Valmet’s latest coating station member in the new OptiCoat family. With the improved OptiCoat Jet blade coating head, Alfeld has been able to further improve coating profiles. “Our customers are really happy with our products,” says Mill Director Stefan Karrer.
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Coater roll covers
For highest quality coated board or paper, with high smoothness and gloss, in blade coating, Valmet offers a full range of reliable rubber roll covers as well as a high performing polyurethane cover. These roll covers have good wear resistance and strength properties ensuring long grinding intervals and long lifetime.
Coater blades play an important role in the paper or board making process. They hugely affect efficiency, both materials and time, and have a major impact on final product quality. In blade coating, paper quality variations and rapid wearing of coater blades inevitably result in production losses and higher blade costs. The Valmet Coater Blade family consists of four carbide blades which leave a uniform layer of coating color on paper or board surface, thus creating an excellent finish for desired coat weight. In addition to having a major impact on end-product quality, blades also improve production efficiency which in turn leads to more saleable production.
Doctoring affects machine runnability, paper and board quality, production costs, and production efficiency. Runnability can be improved by optimizing doctoring parameters and blade materials. Cleaner rolls result in better end-product quality. The blades can be selected to meet customers shutdown schedule which will lead to fewer blade changes resulting in lower blade costs. The reduction of unplanned shutdowns and costly downtime periods can be avoided by reliable and trouble-free doctoring.
A reliable tail threading process decreases tail threading times, minimizes waste and improves safety. This means an investment in your process is an investment that pays for itself. Whether you need improvements in paper or board machines, we have an advanced tail threading solution that clearly enhances your production efficiency. Our comprehensive range of tail threading services, from preventive maintenance to tail threading study secures optimal operation of your equipment and reduces threading times.