FI78523B - TRESKIKTSVIRA. - Google Patents

Description

1 78523

Three-layer wire

The invention relates to a three-layer wire for a wet end of a paper machine or the like, in which 5 treads are formed using overlapping yarn layers, in which the weft yarns are in three layers and the warp yarns are in three layers.

Previously known patents U.S. Pat. No. 3,885,602 and U.S. Pat. No. 3,885,603 and SE 420,852 and DE 2455185 disclose a method of weaving together two or more fabrics with a separate binding warp or weft. However, the use of these types of wires has been limited by the fact that these binder yarns have rubbed against the yarns in the different layers, resulting in wear and tear of the binder yarns and tearing of the layers apart, rendering the wire unusable.

Patent application FI 822731 discloses a way to form a three-layer wire cloth by reinforcing a bond with two base layers. In the shown wire structure-20 sa there is only one warp system, which wears easily across. In addition, in such a structure, long weft yarn runs are formed on the pulp-side surface, which may make it difficult for the pulp web to detach from the wire.

25 In the advertisements SE 389 * 139 »SE 415 * 894

And the wire structures disclosed in SE 415 * 896 are in principle completely similar to the above-mentioned patent application. And these structures thus also have the same weaknesses described above.

It has been an object of the present invention to provide a wire structure which is more wear resistant than a conventional two-ply wire. At the same time, it has been taken into account that other requirements for the wire, water 2 78523 permeability, retention and low markability, do not deteriorate. In such a structure, the weft yarns are in three layers: a surface layer (11 a, b, ...), an intermediate layer (12 a, b, ...) and a base layer (13 a, b, ...) and warp yarns 5 in three layers: a surface layer ( 21 a, b ...), an intermediate layer (22, b ...), and a base layer (23 a, b ...) The structure according to the invention is formed either in such a way that the surface layer (11, 21), the intermediate layer (12, 22) and the base layer (13, 23) are always connected to each other by the warp-10 yarns of the upper layer, i.e. the warps (21) of the surface layer are connected to the weft yarns (12) of the intermediate layer and the warps (22) of the intermediate layer are connected to the weft yarns (13) of the base layer. connected to each other by lower layer warps, i.e. intermediate layer warps 15 (22) to surface layer weft yarns (11) and bottom layer warps (23) to intermediate layer weft yarns (12).

Other features of the invention appear from the claims.

The structure according to the invention achieves the same advantages as a conventional three-layer wire (transverse stiffness and abrasion resistance) and, in addition, in preferred applications the wire is provided with either a uniform (2-arm bond-like), thread-like (phosphor-bronze-like) or satin-like surface structure. Likewise, the desired structure can be provided on the lower surface of the wire. By reducing the weft density in the intermediate and / or bottom layer, mainly in the weft layers of dewatering members, the water permeability can be improved compared to a conventional three-layer wire. Also, by using different wire thicknesses in different layers, the properties of the wire can be modified.

When moving from metal wires to plastic wires, dimensional stability r has often become a problem with paper machines with small tightening resources. The structure according to the invention li 3 78523 also reduces the extensibility, because in it the three-warp system is connected to each other in a certain way, as described above, in which case the weft yarns do not have to interleave with each other and the data protection capacity of the wire is improved.

The invention is explained in more detail below with reference to the accompanying drawings:

Figure 1 shows a structure in which the warps (22 a, h, ... and 2 $ a, b, ...) of the intermediate and bottom layers join the weft yarns (11 a, b, ...) of the surface and intermediate layers. 12 a, b, ...).

The binding report of the application of Figure 1 has five differently binding upper strokes (surface strokes) 21 a-e, four intermediate strokes 22 a-d and four lower strokes (bottom strokes) 23 15 a-d. The upper surface (surface layer) of the wire has a higher weft density than the lower weft layers (intermediate and bottom layers) and the binding report of the example has eight differently binding upper wefts (surface wefts) 11 a-h, four intermediate wefts 12 a-d and four lower wefts 20 (bottom wefts) 13 a-d. The paper machine side surface (bottom layer) of the wire is thinned in both the warp and weft directions to improve water removal and cleanliness.

In the structure of Fig. 2, the warps (21 a, 25 b, ...) of the surface layer bind to the weft yarns of the intermediate layer (12 a, b, ...) and the warps (22 a, b, ...) of the intermediate layer bind to the weft yarns of the base layer (13 a, b , ...).

In the structure according to Figure 2, the binding report has 8 differently binding upper or surface elements 21 a-h, 30 differently binding intermediate spacers 22 a-d and four lower or bottom elements 23 a-d. The upper surface (surface layer) of the wire has a higher weft density than the intermediate and bottom layer, and the bonding report has 16 differently binding upper or surface wefts 11 a-p, eight intermediate wefts 35 12 e-h and eight lower or bottom wefts 13 a-h.

Claims (7)

4,78523 1; A three-layer wire for the wet end of a paper machine or the like, in which a tread is formed using overlapping yarn layers, in which the weft yarns are in three layers (11 a, b, ..., 12 a, b, ... and 13 a, b, ... ) and the warp yarns are in three layers (21 a, b, ..., 22 a, b, ... and 23 a, b, ...), CHARACTERIZED in that the surface layer (11, 21), the intermediate layer (12, 22) and the base layer (13, 23) are always connected to each other by the warp yarns of the upper layer, i.e. the warp yarns (21) of the surface layer are connected to the weft yarns (12) of the intermediate layer and the warp yarns (22) of the intermediate layer are connected to the weft yarns (13) of the base layer. with lower layer warps, i.e., intermediate layer warps (22) to the surface layer weft yarns (11) and bottom layer warps (23) to the intermediate layer weft yarns (12). The wire according to claim 1, CHARACTERIZED in that the warp density in the intermediate and bottom layers (22 and 23) is equal to or lower than in the surface layer (21). The il. The fabric is characterized in that the weft density in the intermediate and bottom layers (12 and 13) is equal to or lower than in the surface layer (11). The wire according to claim 1, CHARACTERIZED in that the upper surface (surface layer) of the wire is similar to a plain weave. "/ 5. A wire according to claim 1 CHARACTERIZED in that the pin layer of the wire is similar to a twine bond. The wire according to claim 1, CHARACTERIZED in that the surface layer of the wire is similar to a rayin bond. Wire according to Claim 1, CHARACTERIZED in that the yarn thicknesses in the surface (11, 21), intermediate (12, 22) and bottom layers (13, 23) are of different sizes. 5 78523 Pa t en tv ra v