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Covering for a machine for producing a fibrous web and method for producing a covering of this type

A fiber web and stretching technology, which is applied in the field of machine stretching and can solve problems such as structural weakening

Pending Publication Date: 2020-10-30
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A further problem with these stretched webs is that the film-like material is structurally strongly weakened due to the large number of through-openings

Method used

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  • Covering for a machine for producing a fibrous web and method for producing a covering of this type
  • Covering for a machine for producing a fibrous web and method for producing a covering of this type
  • Covering for a machine for producing a fibrous web and method for producing a covering of this type

Examples

Experimental program
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Embodiment Construction

[0028] Figure 5A cross-sectional view of a section of the film-like material 12 along the longitudinal direction LR of the stretch web 10 according to the invention is schematically shown in . The stretched web 10 or the film-like material 12 has a first surface 14 and a second surface 16 opposite the first surface 14, the first surface facing the web formed on the stretched web 10 during intended use. Fiber web. Furthermore, it can be seen that between the first surface 14 and the second surface 16 six through-openings 24 extend through the film-like material 12 . Drainage of the fiber suspension for forming the fiber web can take place through these through openings 24 . Each through-opening 24 in this case has a respective, straight central axis 32 , which is shown by a dashed line in the figure. The walls of the through-openings 24 extend rotationally symmetrically about the respective central axis 32 . In the present exemplary embodiment, the through-openings 32 are ...

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PUM

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Abstract

The invention relates to a covering for a machine for producing a fibrous web, more particularly a paper or card web, which is substantially formed from a film-like material (12), having a first surface (14) facing the fibrous web and a second surface (16) facing away from the fibrous web, wherein the covering comprises a plurality of through openings (24), which each extend along a central axis (32) from the first surface (14) to the second surface (16), wherein the central axes (32) of at least some of the through openings (24) in the covering enclose an angle with the first surface (14) which differs from 90 degrees. The invention further relates to a machine for producing a fibrous web, more particularly a paper or card web, comprising a covering of this kind and to a method for producing a covering of this kind, wherein the through openings (24) are made in the film-like material (12) by means of a laser.

Description

technical field [0001] The invention relates to a fabric for a machine for producing fibrous webs, especially paper or board webs, which is formed substantially of a film-like material with a first surface facing the fibrous web and facing away from the fibrous web. A second surface of the fibrous web, wherein the stretched web includes a plurality of through openings extending respectively along a central axis from the first surface to the second surface. Background technique [0002] Today, stretched wires for machines for producing fibrous webs, such as forming wires for paper machines, are still mostly woven. However, the weaving process is expensive and time-consuming. For a long time, therefore, efforts have been made to produce such stretchers from a film-like material which consists of plastic and which can be extruded inexpensively. The film-like material can be produced either as a single layer or can have a plurality of layers which together form a laminate. In...

Claims

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Application Information

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IPC IPC(8): D21F1/00
CPCD21F1/0063
Inventor 米夏埃尔·斯特劳布
Owner VOITH PATENT GMBH
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