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Method for producing a felt belt

a technology of felt belts and woven fabrics, applied in the direction of knitting, weaving, shaping/stretching tubular fabrics, etc., can solve the problems of difficult installation of press felts in paper machines, complex production, woven structures, etc., and achieve the effect of easy seaming

Inactive Publication Date: 2009-12-03
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]It is possible for only one single longitudinal thread to be helically wound in order to produce the longitudinal thread structure. However, it is also possible for a skein of longitudinal threads to be helically wound in order to form the longitudinal thread structure. The one or more longitudinal thread(s) forming the longitudinal thread structure is / are embodied as monofilament thread(s). By providing a longitudinal thread structure made of one or more longitudinal thread(s) whose seam loops are formed by monofilaments, the present invention provides a press felt that is particularly easy to seam.

Problems solved by technology

Press felts embodied as continuous belts have the disadvantage as compared to press felts with a seam that such press felts are difficult to install in the paper machine since they cannot be pulled into the machine as an open belt.
Woven structures have the disadvantage that they are often very complex to produce.
In practice, however, this method has the disadvantage in many cases that, in an intermediate stage of production, the structure lacks the necessary stability in the longitudinal thread direction, therefore, complicating handling during the production process.

Method used

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Examples

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Embodiment Construction

[0042]Referring now to the drawings, and more particularly to FIGS. 1a-1e, there is shown a first embodiment of a method according to the present invention for producing the base structure of a press felt.

[0043]FIG. 1a illustrates the production of longitudinal thread structure 1 of the base structure. To this end, skein of threads 2 parallel to one another are helically wound around two rollers 3, 4 disposed at a distance from and essentially parallel to one another, with the progression of the helical winding, i.e., the winding direction, occurring perpendicularly to the two rollers in the direction of the provided width (CMD) of the felt belt up to the provided width of the felt belt. Here, the length of one winding corresponds to the circumference of thread structure 1 thus formed.

[0044]In the step of the method of the present invention shown in FIG. 1b, carrier layer 5 embodied as a non-woven fibrous layer is applied to thread structure 1; the carrier layer may subsequently be ...

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Abstract

The present invention relates to a method for producing a felt belt, particularly a press felt for a paper machine, including the steps of producing a longitudinal thread structure by continuous helical winding of at least one longitudinal thread in the direction of the provided width of the felt belt, particularly up to the provided width of the felt belt; placing a transverse reinforcement structure on the longitudinal thread structure and connecting the same to the longitudinal thread structure to form a tube-like composite structure; placing opposing sections of the tube-like structure one atop the other such that the tube-like structure forms a flat structure whose length corresponds to approximately half the circumference of the tube-like structure and which provides seam loops on its opposing longitudinal sides, the loops being formed by the at least one helically wound longitudinal thread; making the flat structure continuous by merging the opposing seam loops and connecting the same to one another; and connecting the sections of the flat structure placed one atop the other to form a base structure.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method for producing a felt belt, particularly a press felt, for a paper, cardboard, or tissue machine.[0003]2. Description of the Related Art[0004]Felt belts, in particular press felts for paper, cardboard, or tissue machines, generally have a base structure providing dimensional stability to the felt, which is needled on both sides with one or more non-woven fibrous layers.[0005]Press felts may be provided either as continuous belts or as continuous belts with a seam. Press felts embodied as continuous belts have the disadvantage as compared to press felts with a seam that such press felts are difficult to install in the paper machine since they cannot be pulled into the machine as an open belt.[0006]As a rule, the base structure of the known press felts is woven. Woven structures have the disadvantage that they are often very complex to produce. Therefore, the prior art already prop...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D04H1/46D04H3/10D04H11/08D04H17/10
CPCD21F7/10D21F7/083
Inventor KOCKRITZ, UWE
Owner VOITH PATENT GMBH
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