According to historical perspective, the paper machine speed increased by 2.5% per year, With the increased speed, the open tail portion of the drying unit is not more suited, in order to solve this problem, various studies is working.With Yankee hood used, improve the drying action of the dryer.
working principle: Fans will be heated air enter the Yankee hood, hot air close to the cylinder surface of the paper web by the air distribution within the Hood uniform high-speed impact, so that the sheet of water in the environment of strong convection of hot air quickly evaporation, while producing wet steam was quickly ruled out. Yankee Hood generally designed in 2 to 4 grading cycle, hot air in the system, and make full use of the heat.
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