Industrial textile

Abstract

An industrial textile (1) having a longitudinal direction (MD) and a cross direction (CMD) and a first surface and a second surface, the industrial textile (1) extending in the cross direction from a first edge (E1) to a second edge (E2). The industrial textile (1) has a double warp which comprises a first warp having first machine direction yarns (U1, U2) and a second warp having second machine direction yarns (LI, L2). The yarns (U1, U2) of the first warp are arranged above the yarns (LI, L2) of the second warp and the yarns of the first warp are at least partially offset in respect of the yarns of the second warp. The industrial textile has a weft having cross machine direction yarns (W1, W2, W3, W4). The yarns (U1, U2) of the first warp and the yarns (W1, W2, W3, W4) of the weft bind themselves to each other according to a first predetermined pattern and the yarns (LI, L2) of the second warp and the yarns (W1, W2, W3, W4) of the weft bind themselves to each other according to a second predetermined pattern. The first predetermined pattern and the second predetermined pattern form a textile structure which has the cross machine direction yarns (W1, W2, W3, W4) at least on two different levels in the thickness direction of the industrial textile (1).

Claims

1. An industrial textile having a longitudinal direction and a cross direction and a first surface and a second surface, the industrial textile extending in the cross direction from a first edge to a second edge, the industrial textile comprising: a double warp, the double warp comprising a first warp comprising first machine direction yarns and a second warp comprising second machine direction yarns, the yarns of the first warp being arranged above the yarns of the second warp and at least part of the yarns of the first warp are shifted laterally in respect of the yarns of the second warp, a weft comprising cross machine direction yarns the yarns of the first warp and the yarns of the weft bind themselves to each other according to a first predetermined pattern, the yarns of the second warp and the yarns of the weft bind themselves to each other according to a second predetermined pattern, and the first predetermined pattern and the second predetermined pattern form a textile structure which comprises the cross machine direction yarns at least on two different levels in the thickness direction of the industrial textile, wherein the first predetermined pattern is as follows: the yarns of the first warp and the yarns of the weft bind to each other in such a manner that the yarns of the first warp repeatedly pass over two yarns of the weft and under two yarns of the weft, the yarns of the first warp next to each other being arranged in such a manner that when a coincidentally selected warp yarn is under the weft yarns the warp yarn next to the coincidentally selected warp yarn is above the weft yarns, thus resulting in a granular texture on the first surface; the second predetermined pattern is as follows: the yarns of the second warp and the yarns of the weft bind to each other in such a manner that the yarns of the second warp repeatedly pass above one weft yarn and under three weft yarns, the yarns of the second warp next to each other being arranged in such a manner that when a coincidentally selected warp yarn is above the weft yarn the warp yarn next to the coincidentally selected warp yarn is above the second weft yarn as from the weft yarn above which the coincidentally selected warp yarn is; the weft yarn over which the yarn of the second warp passes is the second weft yarn over which the yarn of the first warp passes.

2. The industrial textile according to claim 1, wherein the first weft yarn over which the yarns of the first warp passes, has a larger cross section compared to the second weft yarn.

3. The industrial textile according to claim 1, wherein the warp cover of each warp is from 75 to 95%.

4. The industrial textile according to claim 1, wherein the first machine direction yarns of the first warp are flat yarns.

5. The industrial textile according to claim 1, wherein the second machine direction yarns of the second warp are flat yarns.

6. The industrial textile according to claim 1, wherein the cross machine direction yarns of the weft are round or oval yarns.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following the invention will be described in greater detail by means of preferred embodiments with reference to the attached drawings, in which

(2) FIG. 1 shows a view from above explaining directions of an industrial textile;

(3) FIG. 2 shows an industrial textile in a perspective view;

(4) FIG. 3 shows the outline of the first surface of the industrial textile of FIG. 2;

(5) FIG. 4 shows a cross section of the industrial textile of FIG. 2.

DETAILED DESCRIPTION OF THE INVENTION

(6) FIG. 1 shows an industrial textile 1 from above. A first surface of the industrial textile 1 is up. The industrial textile 1 has a cross machine direction CMD and a machine direction MD. The cross machine direction CMD corresponds to a weft direction and the machine direction corresponds to a warp direction, i.e. a longitudinal direction of the industrial textile 1. The industrial textile 1 extends from a first edge E1 to a second edge E2.

(7) FIG. 2 shows an industrial textile 1 in a perspective view with the first surface up. The industrial textile 1 comprises yarns U1 and U2 of the first warp, and yarns L1 and L2 of the second warp. The yarns U1 and L1 are essentially one upon the other but the yarns U2 and L2 are offset, i.e. the yarn U2 is shifted laterally in respect of the yarn L2. However, it is possible that also the yarns U1 and L1 are offset. The yarns U1, U2, L1 and L2 are usually monofilament yarns and they may be flat yarns. The warp cover of each warp is preferably from 75 to 95%. For example, a flat warp yarn may have a width of 0.75 mm and there may be 230 warp yarns per 100 mm, 115 yarns in each warp. The warp cover is then 0.75 mm×115/100 mm=86%.

(8) The industrial textile 1 also comprises yarns W1, W2, W3 and W4 of the weft. The yarns W1, W2, W3 and W4 are usually monofilament yarns and they may be round or oval yarns. The above-mentioned elements are repeated in the industrial textile 1 so it is adequate to describe how they are bound.

(9) The yarns U1, W1, W2, W3 and W4 bind to each other according to a first predetermined pattern so that the yarn U1 repeatedly passes over the yarns W3 and W4 and under the yarns W1 and W2. The yarn U2 next to the yarn U1 repeatedly passes under the yarns W3 and W4 and over the yarns W1 and W2. This results in the granular texture on the first surface, as seen in FIG. 1. An individual grain is marked by number 2.

(10) The yarns L1, W1, W2, W3 and W4 bind to each other according to a second predetermined pattern so that the yarn L1 repeatedly passes over the yarn W4 and under the yarns W1, W2 and W3. The yarn L2 next to the yarn L1 repeatedly passes over the yarn W2 and under the yarns W1, W3 and W4.

(11) The yarns W1 and W2 are in the same shed in respect of the first predetermined pattern as well as the yarns W3 and W4 are in the same shed in respect of the first predetermined pattern. As the yarn L1 passes over the yarn W4 and the yarn L2 passes over the yarn W2 the yarns W2 and W4 are forced downwards in respect of the yarns W1 and W3. The weft yarn W3 and the weft yarn W4 with the warp yarn L1 support the first warp yarn U1 underneath as well as the weft yarn W1 and the weft yarn W2 with the warp yarn L2 support the second warp yarn U2 underneath. As every other yarn of the first warp (U1 or U2) passes over two weft yarns (W1 and W2; or W3 and W4) and every other yarn of the second warp (L1 or L2) passes over one weft yarn (W2 or W4) a continuous ridge R is formed. The ridge extends from the first edge E1 to the second edge E2.

(12) FIG. 3 shows the outline of the first surface of the industrial textile 1 in the longitudinal direction of the industrial textile 1. The rotating direction of the textile 1 is illustrated by arrow T. The outline of the first surface is formed of sequential asymmetric ridges R. The outline is formed of the parallel warp yarns U1 and U2.

(13) FIG. 4 shows a cross sectional view of the industrial textile 1 of FIG. 2 during a washing process. The weave, i.e. how the yarns bind themselves, is described in connection with FIG. 2. In FIG. 4, there is a cleaning head 3 which directs a high pressure jet 4 of washing liquid towards the industrial textile 1. The industrial textile 1 has the predetermined rotating direction T. As the jet 4 hits the industrial textile 1 the washing liquid penetrates into the textile 1 through channels which are formed in the textile 1 by reason of the warp yarns which are offset, i.e. the yarns U2 and L2 in FIG. 2. There is a space C on the second side of the textile 1. The space C makes it possible that the washing liquid penetrates through the whole structure of the textile 1.

(14) The weft yarns W1, W2, W3 and W4 are positioned in such a manner that the surface area of the textile 1 which is met by the jet 4 is minimized, thus maximizing the amount of the washing liquid which penetrates into the industrial textile 1. The weft yarns W1, W2, W3 and W4 lead the jet 4 through the textile 1.

(15) There is a space D on the first surface of the industrial textile 1. Negative pressure prevails in the space D due to the shape of the running path of the warp yarns and the positioning of the weft yarns. The negative pressure enhances removing and collecting dirt and the residues of the washing liquid. The asymmetric running path of the warp yarns U1, U2 on the first surface of the industrial textile 1 diminishes the wear and the fibrillation of the warp yarns.

(16) It will be obvious to a person skilled in the art that, as the technology advances, the inventive concept can be implemented in various ways. The invention and its embodiments are not limited to the examples described above but may vary within the scope of the claims.