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Machine and method for producing fibrous web

A fibrous material and machine technology, applied in the field of manufacturing fibrous material web, to achieve high specific volume value, reduce line load and optimize the effect of web quality

Active Publication Date: 2022-04-12
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This machine configuration is ideal in itself, but has the disadvantage that, since the bottom side of the dryer web is pre-dried and then the quality of this bottom side of the web is also adjusted by the MG smoothing Yankee cylinder, the The moisture content on the bottom side is less than the top side of the web before winding onto the MG smoothing Yankee cylinder, which means that the bottom side of the web is actually the "wrong side" for high or highest quality properties

Method used

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  • Machine and method for producing fibrous web
  • Machine and method for producing fibrous web
  • Machine and method for producing fibrous web

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] figure 1 The formation of the moisture gradient in the z-direction of the fibrous web obtained by one-sided predrying of the fibrous web on the bottom side of the fibrous web is schematically shown.

[0047] Then, due to the unilateral predrying on the bottom side of the web, a moisture gradient develops towards the top side of the fibrous web, which means that the bottom side of the fibrous web in contact with the MG smoothing Yankee cylinder has a lower moisture content than its top side moisture content. However, this is diametrically opposed to the pursuit of optimum quality properties on the bottom side of the fibrous web in contact with the MG smoothing Yankee cylinder.

[0048] figure 2 and 3 A purely exemplary embodiment of a machine according to the invention for producing a fibrous web, in particular a paper or cardboard web, is shown schematically with the highest possible running performance of the machine and a relatively low grammage of the fibrous web...

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Abstract

A machine for producing a fibrous web, in particular a paper or cardboard web, comprises a headbox, a forming unit, a press section, a pre-drying section, an MG leveling roller and a winding device. The pre-drying section is designed to pre-dry the bottom side of the fibrous web on one side. The overhead MG leveling Yankee drum is provided as an MG leveling Yankee drum, with which the underside of the fibrous web is in contact. In the running direction of the web, after the pre-drying section and before the fiber web is wound onto the MG flattening Yankee drum, a moisture regaining device is arranged for regaining the bottom side of the fiber web on one side and correspondingly forming a humidity gradient in the z-direction of the fiber web in the direction of the bottom side of the fiber web. The invention further relates to a method for producing a fibrous web, in particular a paper or cardboard web, in which a machine according to the invention, in particular, can be used.

Description

technical field [0001] The invention relates to a machine for producing a fibrous web, in particular a paper or board web, having a headbox, a forming unit, a press section, a predrying section, an MG smoothing Yankee cylinder and a winding device. Furthermore, the invention relates to a method for producing a fibrous web, in particular a paper or cardboard web, which can be carried out in particular by using such a machine. Background technique [0002] During the production of fibrous webs, eg smooth paper on one side, the paper web is guided after the press section to large, steam-heated cylinders, so-called smoothing cylinders or Yankee cylinders. Such cylinders are used on the one hand to dry the paper web. On the other hand, the paper web is smoothed or calendered on its side facing the smoothing or Yankee cylinder by prolonged contact with the smooth and hot surface of the smoothing or Yankee cylinder. This is an important production step in the manufacture of paper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F11/02D21F5/02D21F5/18D21G1/00
CPCD21F5/04D21F5/181D21F9/00D21F11/02
Inventor T.科尔哈根
Owner VOITH PATENT GMBH
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