Steam device and method for adjusting moisture of paper sheet by using vacuum degree

Abstract

The present invention discloses a steam device and a method for adjusting moisture of a paper sheet by using a vacuum degree. The steam device comprises a steam box and a vacuum box which are matched for use; the steam box is arranged above a wet paper sheet and the vacuum box is arranged below the wet paper sheet; the bottom surface of the steam box is a steam spraying region; the top surface of the vacuum box is a pumping region; and the area of the pumping region is larger than that of the steam spraying region. The method comprises: continuously conveying the wet paper sheet between the steam box and the vacuum box; providing steam to the surface of the wet paper sheet in the direction from the upper side of the wet paper sheet by the steam box so as to improve the temperature and humidity of the wet paper sheet; pumping the wet paper sheet from the lower side of the wet paper sheet by the vacuum box; and controlling the temperature and humidity of the wet paper sheet by controlling pumping amount. According to the steam device and the method, disclosed by the present invention, the temperature and humidity of the wet paper sheet are adjusted by using a vacuum degree adjusting manner; the device has a simple structure and the utilization rate of the steam is high; and the better moisture adjusting effect can be realized and the quality of the paper sheet is effectively improved.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a steam device and method for adjusting paper moisture by using vacuum degree. Background technique [0002] The steam box sprays steam along the paper banner, the steam condenses in the paper and releases latent heat, thereby increasing the temperature of the wet paper web, reducing the surface tension and viscosity of water in the wet paper web, and improving the dehydration capacity of the wire section, the press section and the drying cylinder At the same time, it can adjust the uniformity of the moisture content of the paper banner, improve the printing performance of the paper after calendering and the coating performance of the coated paper, and the banner uniformity of the printing performance. Therefore, the steam box is widely used in various Paper machines, especially special paper machines with high product quality requirements. [0003] The steam box...

AI Technical Summary

Problems solved by technology

[0007] However, the disadvantages of the above method are also obvious. Not only a separate steam box, but also a separate vacuum box, and two sets of control systems are required, and interlock control is required. Therefore, on the one hand, the complexity of the control is increased, and on the other hand, the investment and maintenance costs

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