Steam device of supercalender and paper sheet moisture regulation method therefor

Abstract

The invention discloses a steam device of a supercalender and a paper sheet moisture regulation method therefor. In the steam device, a steam box and a spray box are arranged sequentially along paper sheet conveying direction, air atomizers are arranged in the spray box, a steam header pipe is connected with the steam box through steam branch pipes, a compressed air header pipe is connected with the air atomizers through compressed air branch pipes, and a low-pressure water header pipe is connected with the air atomizers through low-pressure water branch pipes. According to the paper sheet moisture regulation method, steam is conveyed into the steam box by the steam header pipe through the steam branch pipes and is sprayed to the surface of a paper sheet through through holes in a bottom plate; and meanwhile, compressed air is conveyed into the air atomizers by the compressed air header pipe through the compressed air branch pipes, low-pressure water is conveyed into the air atomizers by the low-pressure water header pipe through the low-pressure water branch pipes, and water mist is formed by the compressed air and the low-pressure water in the air atomizers and is sprayed to the surface of the paper sheet so as to further regulate the temperature and humidity of the paper sheet. According to the steam device of the supercalender and the paper sheet moisture regulation method therefor, the temperature and humidity of the paper sheet can be effectively regulated so as to improve the calendering effect.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a steam device of a super calender and a paper moisture regulating method thereof. Background technique [0002] Super calender is a kind of finishing equipment for papermaking. On the basis of paper machine calendering, the paper web passes through a number of nips formed by the paper pulp rollers and metal rollers on the super calender. Under a larger linear pressure, the fibers are plasticized by the friction between the calender rolls and the heating of the paper web, thereby further improving the smoothness and gloss of the paper, while increasing the tightness and improving the uniformity of thickness. [0003] Among the factors affecting the super-calendering effect of paper, in addition to calendering light pressure, calendering speed, number and hardness of rollers, paper composition and other factors, the moisture and temperature of paper are also import...

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Problems solved by technology

[0008] However, in actual use, this method obviously has the following problems: firstly, the ventilation cooling area is adjacent to the steam area, and the steam will be drawn away during the ventilation, which reduces the effect of steam humidification and wastes energy at the same time; secondly, The cooling effect is not good, if the exhaust air volume is too large, the useful steam will be sucked away, if it is too small, the required cooling effect will not be achieved; finally, the exhaust air control temperature is not accurate, and it is difficult to achieve the desired effect

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