What is the main working principle of the high-speed Yonker hood?

Yonker air cover is a commonly used drying equipment, which is more effective for thin paper machines, special paper machines and toilet paper machines. it is a kind of modern high-speed paper and.It is characterized by a high degree of automation, high output, fast speed, can better save human capital, only a few people to operate can successfully complete the production task.

Using the principle of contact drying and convection drying, the Yonker hood uses high-temperature and high-speed hot air to blow to the paper sheet to form convective heat transfer, the hot air blows to the paper sheet, the air film on the interface is destroyed, or the thickness is reduced, the heat transfer is enhanced, evaporation is enhanced, the paper drying rate and output are increased, and the energy consumption is reduced. 

When the wet paper is introduced into the pressing area, the drying operation occurs at the moment when the wet paper is in contact with the cylinder, and then the paper is affixed to the surface of the cylinder, and water transfers heat and quality in an extremely complex form. When the moisture in the paper turns into water vapor, it flows from the closed space of the wet paper to its surface, migrates out in the form of liquid, fills all the gaps, and then spreads out to the external environment.

For the high-speed hot air Yonker hood, there are several factors for the drying rate of the paper sheet during operation: 

1 the paper is related to the heat transfer area of the air cover. 

The hot air nozzle with high temperature Yankee hood has a good geometric shape, which ensures that the paper is transversely dried uniformly and the moisture distribution is consistent. 

(2) the speed at which high temperature air is ejected. 

If the temperature of the ejected air from the hood is increased, the heat transfer will be increased by 30%. 

(3) the advantages and disadvantages of the structural design of the air hood. 

The structure design of the air hood is reasonable, and the raw materials for making the air cover have good heat resistance. 

4 strength of raw materials used in making air hood. 

The raw materials for making the air cover are easy to cut, weld and form, and have strong corrosion resistance; the surface of the air cover must have an insulation layer made of thermal insulation material to prevent the high temperature air of the air cover from leaking out, so as to avoid damage to all kinds of surrounding devices caused by the leakage of high temperature air, or cause fire.

The advantage of Yonker hood is mainly reflected in its perfect combination of convection drying and de-drying, better improving the drying speed of Yonker drying, greatly increasing production output and reducing steam consumption, saving more production energy for many enterprises. 

The drying capacity of the high-speed Yonker hood is four to ten times higher than that of the ordinary hood. Its special drying method makes the paper softer and can better improve the economic benefits for enterprises.