EP0889990B1 - Stitched seam for high-tensile woven fabrics - Google Patents

Abstract

PCT No. PCT/EP97/01347 Sec. 371 Date Sep. 17, 1998 Sec. 102(e) Date Sep. 17, 1998 PCT Filed Mar. 15, 1997 PCT Pub. No. WO97/35065 PCT Pub. Date Sep. 25, 1997A stitched seam for high-tensile woven fabric strips, in particular for dryer screen fabric for paper machine clothing, wherein the warp thread loops of the two fabric sections to be interconnected are connected at the location of the common seam by a closure wire. At least one of the two outer regions of the two fabric strip sections to be interconnected comprises a worked-in helix at the location of the seam. Each of the helices embraces at least one weft thread and the closure thread. The other region of the stitched seam of the ends of the two fabric strip sections consists of the loops formed by the warp threads of the fabric.

Description

The invention relates to a high tensile fabric tape, in particular dryer fabric tape for paper machine clothing, which two from warp threads and Weft threads having existing fabric sections, the mutually facing ends are connected by a seam, with the warp threads at the end of the two Fabric sections form loops projecting at different distances and the farthest protruding warp thread loops of the two fabric sections on a common Connection line through a locking wire through these loops are connected.

In the case of so-called loop seam connections, the fabric edge is generally the strongest claimed position. In the event of overvoltages occurring in the tissue, these points occur often a so-called eyelet rupture, which means a repair or replacement of the tissue makes necessary.

DE-A-28 06 742 discloses a dryer fabric belt for paper machine clothing known which two fabric sections consisting of warp threads and weft threads has, the mutually facing ends connected by a seam connection are, the warp threads at the end of the two fabric sections different form protruding loops and the most protruding warp thread loops of the two tissue sections on a common connecting line a locking wire guided through these loops are connected to one another. Here no reinforcement of the outer areas of the seam connection is provided.

Furthermore, FR-A-813 486 is a metallic fabric tape for paper machines known, the ends of which are connected by a seam, the outer regions the seam is reinforced by metallic wires and with an elastic material or coated with a forgeable metal.

AT-A-324 110 discloses a screen belt for dewatering machines made from a fabric consists of warp and weft threads, in which to connect the screen belt to an endless band the ends of the sieve belt to be connected in the area of Band edges spliced and the warp threads of different lengths separated with their corresponding ones severed warp threads at the other end and the weft threads interwoven with the remaining middle part of the sieve belt being sewn overlapped.

The object of the invention is in the generic fabrics, the seam connection in reinforce their outer areas and thus prevent the risk of eye breakage, at least to reduce, and in this way the lifespan of such fabrics to increase.

According to the invention, this object is achieved in that in at least one of the the warp thread loops of the two fabric sections protrude equally and the seam connection by a spiral seam connection is formed, the two worked into the respective tissue section end Has coils, each of the coils with the warp thread loops of the respective Tissue section is integrated in this at least one outer area and at least one weft thread of the respective fabric section and the closing wire encloses, and that the warp loops in the rest of the seam connection the two fabric sections protrude differently and the seam connection through the most protruding warp thread loops of the two fabric sections is formed, through which the locking wire is guided.

Further embodiments of the invention are the subject of the dependent claims.

The seam connection proposed by the invention basically consists of a Foreign material that is in the form of a spiral arrangement and at least on one side, usually, however, on both side areas of the two fabric sections in whose edge area is incorporated. This creates a seam connection that two different seam connection systems, and the one reinforcement precisely at the weak points, namely the outer sections of the fabric. Compared to a conventional loop seam, in which only every second thread as Connecting thread can be used, and thus the seam tear strength in comparison to the fabric tear strength is about 50% is when using an inventive Seam reinforcement held the helix through all the warp threads, making a substantial Increase in seam tear strength compared to a loop seam is achieved. The tensile strength value depends primarily on the strength of the coil or its Diameter and their material properties.

The helix arrangement is designed so that one helix each in the left and right edge areas of the mutually facing free ends of the two tissue sections is incorporated. At the points of the coils, the warp threads extend in Loop shape equally far at the end limit, while it is in the remaining part of the fabric panel are staggered in the longitudinal direction in a conventional manner and the Loops of the two fabric sections alternately protrude differently, so that only every second loop of each of the two fabric sections connects the connecting wire encloses.

The ends of the two coils in the two tissue sections become the center of the tissue anchored there. The respective spiral end piece is straightened and pulled back towards the fabric and at the transition from the loop seam is a straightened Piece incorporated, so that pulling out the coil ends is not is possible. The incorporation of the coils can be carried out simultaneously with the manufacture of the Loop seam done, but it is easily possible to retrofit the coils to be worked in separately.

Fig. 1

eine Prinzipdarstellung der erfindungsgemäßen Nahtverbindung, in geöffneter Position,

Fig. 1a

eine Prinzipdarstellung entsprechend Figur 1 in geschlossener Position,

Fig. 2

eine detailliertere Darstellung eines Ausschnittes aus der erfindungsgemäßen Nahtvorrichtung in geschlossener Position, in Aufsicht,

Fig. 3

eine Darstellung der Nahtverbindung in Form des Kreisausschnittes nach Fig. 2, jedoch nur der Teil-Nahtverbindung des Gewebeabschnittes 1;

Fig. 4

eine fotografische Wiedergabe eines Gewebeausschnittes mit geschlossener Nahtverbindung (Teil eines Randabschnittes (Wendelverbindung) und Teil eines Mittenabschnittes (Schlaufenverbindung)),

Fig. 5

eine fotografische Wiedergabe des Überganges der beiden Nahtsysteme in gegenüber Fig. 4 vergrößerter Darstellung,

Fig. 6

eine fotografische Wiedergabe des Überganges der beiden Nahtsysteme in gegenüber Fig. 3 vergrößerter Darstellung.

The invention is explained below in connection with the drawing using exemplary embodiments. It shows:

Fig. 1

2 shows a basic illustration of the seam connection according to the invention, in the open position,

Fig. 1a

2 shows a basic illustration corresponding to FIG. 1 in the closed position,

Fig. 2

2 shows a more detailed illustration of a detail from the seam device according to the invention in the closed position, in supervision,

Fig. 3

a representation of the seam connection in the form of the circular section of Figure 2, but only the partial seam connection of the tissue section 1.

Fig. 4

a photographic reproduction of a fabric section with a closed seam connection (part of an edge section (spiral connection) and part of a middle section (loop connection)),

Fig. 5

3 shows a photographic representation of the transition of the two seam systems in an enlarged view compared to FIG. 4,

Fig. 6

a photographic representation of the transition of the two seam systems in an enlarged view compared to FIG. 3.

Fig. 1 shows the ends of two fabric sections 1 and 2, which are connected to one another common seam connection 3 are connected. The seam connection 3 is in several parts executed and consists of a loop seam connection in each of the two fabric sections 4, 4 'in the central region of each tissue section and from one reinforcing spiral seam connection 5, 6, 5 ', 6', on the two outer areas each Tissue section. The two seam systems and the seam connections 4 - 6, 4 '- 6' penetrating closing wire is designated 7.

The warp threads of the fabric section 1 are in Fig. 2 and 3 with 8, 8a, 8b, 8c, .... the Warp threads of the fabric section 2 designated 9, 9a, 9b, 9c ..., the weft threads of the Fabric section 1 with 10, 10a, 10b ... and the weft threads of the fabric section 2 with 11, 11a, 11b, ...

The helix 12 of the helical seam connection 5 is incorporated into the fabric section 1, the coil 13 in the tissue section 2. In the case of separate tissue sections, the the windings W are the helix for connection to one another 12 and 13 arranged to gap to each other and overlap in the longitudinal direction of the Fabric tape so far that the connecting wire 7 between the turns W of the two Coils 12 and 13 can be passed through; at the same time this connecting wire 7 in the remaining area of the fabric web (outside the spiral arrangement) in Form of a conventional loop seam alternately by the loops adjacent parallel warp threads introduced, as shown in Fig. 2 in detail. The spiral ends are formed as extensions 14, 15 of the coils 12, 13 and are after the tail end piece has been straightened and pulled back towards the tissue is anchored in the interior of the fabric by the longitudinal threads. The coils 5 and 6 will be preferably incorporated at the same time as the loop seam 4, so that it already has Are part of the fabric sections 1 and 2 to be connected to each other. You can but can also be worked in separately afterwards.

The coils 12 and 13 take the common connecting wire in their windings W. 7, in the area of the helically reinforced seam connection 3, one turn W the helix 12 and the helix 13 penetrate, the windings W of the helices 12, 13 e.g. are arranged on gap, and instead of the loops of the warp threads of the two Sections 1 and 2 the connection of the two fabric sections 1 and 2 in the area of reinforcement. The loop seam in the rest of the seam connection of the Tissue belt is of conventional design. Enclose coils 12 and 13 in each case the closing wire 7 and one weft thread 10 or also several weft threads 10, 10a, 10b.

Reference list

1

first section of tissue

2nd

second tissue section

3rd

Seam connection

4, 4 '

Loop connection

5, 5 ', 6, 6'

Spiral connection

7

Locking wire

8, 8a, 8b ...

Warp threads of the fabric section 1

9, 9a, 9b ...

Warp threads of the fabric section 2

10, 10a, 10b ...

Weft threads of the fabric section 1

11, 11a, 11b ...

Weft threads of the fabric section 2

12th

Spiral

13

Spiral

14, 15

Extensions of the spirals

Claims (6)

1. High-tensile fabric web, especially for dryer screen fabrics for paper machine clothing, comprising two fabric sections (1, 2) consisting of warp yarns (8, 9) and weft yarns (10, 11), the facing ends of which are interconnected by a stitched seam connection (3), whereby the warp yarns (8, 9) at the end of the two fabric sections (1, 2) form loops which extend differently far, and the furthest extending warp yarn loops (S) of the two fabric sections (1, 2) are interconnected with each other at a common connection line by means of a closure wire (7) passing through said loops,
   characterised in that
   in at least one of the two outer regions of the stitched seam connection (3) the warp yarn loops (S) of the two fabric sections (1, 2) extend equally far, and the stitched seam connection (3) is formed by a helix seam which is provided with two helices (12, 13) worked into the corresponding fabric web ends, whereby each of the helices (12, 13) is interlaced with at least one warp yarn loop (S) of the corresponding fabric section (1, 2) in said at least one outer region, and embraces at least one weft yarn (10, 11) of the corresponding fabric section (1, 2) and the closure wire (7), and that within the remaining portion of the stitched seam (3) the warp yarn loops (S) of the two fabric sections (1, 2) extend differently far and the stitched seam connectioin (3) is formed by the furthest extending warp yarn loop (S) of the two fabric sections (1, 2) through which the closure wire (7) is passed.
2. Fabric web according to claim 1, characterised in that the two outer regions of the stitched seam connection (3) are provided with a helical stitched seam.
3. Fabric web according to claim 1 or 2, characterised in that the helices (12, 13) within the outer region resp. two outer regions of the fabric sections (1, 2) are intelaced at least with the last weft yarn (10, 11), which together with the end loops of the warp yarns (8, 8b) forms the restriction of the corresponding fabric section, and that the helices (12, 13) are worked into the respective fabric edges.
4. Fabric web according to one of claims 1 - 3, characterised in that the helices (12, 13) consist of PEEK, PPS, PET, PA, PC, aramide, metal or the like, and are matched to the materials used for the fabric.
5. Fabric web according to one of claims 1 - 4, characterised in that one turn (W) of the helix (5) is located between each two adjoining end loops (S) of the warp yarns (8, 8b).
6. Fabric web according to one of claims 1 - 5, characterised in that one turn (W) of the helix (12) of one fabric section (1) is positioned alternating with one turn (W) of the helix (13) of the other fabric section (2).

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