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Machine for producing a sheet of one-sided smooth sheet of paper

A paper web and machine technology, applied to extrusion, paper web machines, can solve problems such as unsatisfactory smoothness distribution or smoothness lateral distribution, uneven extrusion, damage to machine flexibility, etc.

Inactive Publication Date: 2009-11-04
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Variations in steam pressure and linear force (Linienkraft) lead to non-uniform extrusion over the length of the cylinder and thus also unsatisfactory smoothness or smoothness distribution across the board
If a uniform extrusion of a relatively smooth or Yankee dryer is to be achieved, the operating window (Betriebsfenster) refers to the steam pressure of the dryer and the linear force of the two squeeze rollers on the smooth or Yankee dryer are strongly restricted, which impairs the flexibility of the entire machine

Method used

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  • Machine for producing a sheet of one-sided smooth sheet of paper
  • Machine for producing a sheet of one-sided smooth sheet of paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] figure 1 A schematic partial view of an exemplary embodiment of a machine 1 for producing a single-faced smooth paper web 12 with a forming zone 14 , a pressing zone 16 and a drying zone 18 is shown.

[0035] Here, the paper web 12 to be produced is taken up from the filter screen 24 of the forming area 14 by means of the water-absorbing first press felt 20 in the region of the first take-up roll 22 surrounded by the press felt 20 , and with the first The press felt 20 is guided together with an at least substantially non-absorbent smooth conveyor belt 26 through a nip 28 of rollers assigned to the press zone 16 . The first press felt 20 leaves the paper web 12 and the smooth conveyor belt 26 immediately after the press nip 28 assigned to the press zone 16 .

[0036] Next, the paper web is taken up from the smooth conveyor belt 26 by means of a second press felt 30 which is preferably preconditioned and in particular structurally non-absorbent and which is not guided t...

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Abstract

The invention relates to a machine for producing a sheet of one-sided smooth sheet of paper, which includes a forming area, a pressing area, and a drying area. The back side of the sheet opposite to the front side to be smoothed is not only in a pressing nip assigned to the pressing area, but also in a pressing nip assigned to the drying area, and in contact with a pressing felt, wherein the first pressing nip assigned to the drying area is formed between a felted pressing element and a polishing and / or Yankee cylinder. A paper web is guided in a web running direction by the second pressing nip assigned to the drying area after the first pressing nip is assigned to the drying area. The second pressing nip is formed between a smooth press surface and the polishing and / or Yankee cylinder, where a rear side of the paper web contacts with the smooth press surface in the pressing nip.

Description

technical field [0001] The invention relates to a machine for producing a smooth-sided paper web with a forming zone, a pressing zone and a drying zone, wherein the back side of the paper web opposite the front side to be smoothed is both pressed and pressed. In the press nip (Pressnip) assigned to the area, it is also in contact with the extrusion felt in the first press nip assigned to the drying area, wherein the first press nip assigned to the drying area is formed in the felting between the extrusion elements and the smooth and / or Yankee dryers. A machine of this type is described in the as yet unpublished German patent application 102007027270.9. Background technique [0002] Now, one side is smooth and the areal weight is typically 25 to 50 g / m 2 The production of the paper from ® is carried out on so-called MG machines (MG=machine smoothing). Here, the web with relatively low dryness is transferred by means of squeeze rolls on smooth or Yankee dryers. [0003] In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F9/00D21F3/04D21F5/02D21G1/00
CPCD21F5/181D21F5/02D21F3/0281
Inventor 彼得·米尔斯伯格于尔根·曾兹
Owner VOITH PATENT GMBH
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