A steam box and a method for adjusting the temperature and humidity of paper

Abstract

The invention discloses a steam box and a method of adjusting temperature and humidity of paper. A preheating chamber is arranged outside the steam box; the preheating chamber is connected to an upstream pipeline of a steam manifold through a preheating branch pipe; the steam box comprises a constant current region and a regulation region along an advance direction of the paper in sequence, and a perforated plate is arranged at the bottoms of the constant current region and the regulation region; a downstream pipeline of the stream manifold is divided into a branch pipe of the constant current region and a branch pipe of the regulation region; the constant current region is an independent constant current chamber, and the constant current chamber is communicated with the branch pipe of the constant current region through a constant current branch pipe; the regulation region is divided into a plurality of independent regulation chambers through partition boards and is communicated with the branch pipe of the regulation region through a regulation branch pipe; the constant current region and the regulation region are combined, the caliber of the branch pipe of the constant current region is greater than the caliber of the branch pipe of the regulation region, the stream flow of the regulation region is small, so that the size of a branch pipe control valve is reduced; the length of the regulation region is greater than that of the constant current region so as to be beneficial for full action of the steam and the paper, thereby increasing the utilization efficiency of the stream; the stream overflow is reduced, and the environment of manufacturing the paper with pulp is preferably protected.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a steam box and a method for adjusting the temperature and humidity of paper. 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] This means that the steam box needs to be equipped with a control valve with a relatively large flow rate, which will undoubtedly increase the investment cost

At the same time, a large amount of steam pours into a steam injection area, which increases the possibility of steam overflow, which not only wastes steam but also destroys the manufacturing environment.

On the other hand, the action of steam and paper requires a process, so a certain contact time is very necessary. Even if the steam injection area is long enough, all the steam will be sprayed to one steam area, there will inevitably be a large amount of steam that has not had time. When it interacts with the paper, it will be carried out by the paper to the environment outside the steam box, which also wastes steam and destroys the manufacturing environment.

Images