Method Of Moistening Paper Web And Paper Web Moistening Device

Inactive Publication Date: 2008-02-07
METSO AUTOMATION OY (FI)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] The basic idea of the invention is that several moistening nozzles are arranged in the body of the paper web moistening device. At least one means for removing water mist and/or air from the vicinity of the paper web surface is arranged between the moistening nozzles so that the means extends closer to the paper web than the moistening nozzle. By means of the invention, the desired moisture profile can be achieved with a very high accuracy. Furthermore, the detrimental effect of air currents on moisture nozzle responses can be prevented, which facilitates the controlling of the moistening device. The idea of an embodiment is that the means for removing water mist and/or air from the vicinity of the paper web surface is a disch

Problems solved by technology

A problem associated with moistening devices is how to achieve a sufficiently even moistening result.
The air currents generated make the controlling of the moistening nozzle response difficult, i.e. the fact which point of the paper web is in reality moistened by moistening nozzle.
In the moistening device, the current ma

Method used

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  • Method Of Moistening Paper Web And Paper Web Moistening Device
  • Method Of Moistening Paper Web And Paper Web Moistening Device

Examples

Experimental program
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Embodiment Construction

[0015]FIG. 1 illustrates a paper web moistening device where the body 1 is provided with moistening nozzles 2. The body 1 is a beam arranged in the cross direction of the paper web 3. The moistening device is arranged below the paper web 3. The paper web 3 moves in the direction of arrow A. The paper web 3 may be a paper or cardboard web already manufactured in a paper machine or a fibrous web in a paper machine or cardboard machine, still containing moisture that is to be removed in the paper machine. The moistening device is typically arranged below the paper web 3, but if desired, it may also be mounted above the paper web 3 or both above and below the paper web. The particular purpose of the moistening device is to increase the moisture content of the paper web 3.

[0016] Water mist is blown or sprayed by moistening nozzles 2 towards the paper web 3 surface, the water mist being typically a mixture of air and water. The cone-shaped water mist spray achieved by means of the moiste...

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Abstract

A paper web moistening device comprises several moistening nozzles (2) in the cross direction of a paper web for blowing water mist comprising air and water onto the paper web (3) surface. At least one means for removing water 5 mist and/or air from the vicinity of the paper web (3) surface is arranged be-tween the moistening nozzles. This means is arranged closer to the paper web (3) surface than the moistening nozzles (2).

Description

BACKGROUND OF THE INVENTION [0001] The invention relates to a method of moistening a paper web comprising moistening the paper web by a moistening device by spraying water mist onto the paper web surface and by removing excess water mist from the moistening device. [0002] The invention further relates to a paper web moistening device comprising a body, moistening nozzles and at least one means for removing water, water mist or air from the moistening device. [0003] The paper web is moistened to control the paper web moisture profile, for instance. Moistening can also be used for managing the curling of the paper web in the paper machine. Furthermore, in online calendering, for example, the controlling of certain quality measures requires high-grade moistening with water. [0004] The moistening device is provided with several moistening nozzles in the cross direction of the paper web for blowing water mist containing air and water onto the paper web surface. One moistening apparatus o...

Claims

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Application Information

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IPC IPC(8): D21H23/02D21H23/20
CPCD21F7/008D21G7/00D21G1/0093
Inventor LATTI, HANNUKETTUNEN, HEIKKIHEIKKINEN, ANTTIPOSTI, NIKOALMI, JARI
Owner METSO AUTOMATION OY (FI)
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