EP1798336B1 - Papermaking fabric - Google Patents

Abstract

The forming web of a paper-making machine, comprises an upper fabric layer, whose external side forms a paper face, a lower fabric layer, whose external side forms a machine side of the paper making fabric, binder yarns extending itself in longitudinal thread direction, and lower cross-connected threads. The binder yarns connect the upper and the lower fabric layer with one another. The upper fabric layer is formed by the binder yarns and with the interwoven upper cross-connected threads extending itself transverse to the binder yarns. The lower fabric layer is formed by the binder yarns. The forming web of a paper-making machine, comprises an upper fabric layer, whose external side forms a paper face, a lower fabric layer, whose external side forms a machine side of the paper making fabric, binder yarns extending itself in longitudinal thread direction, and lower cross-connected threads. The binder yarns connect the upper and the lower fabric layer with one another. The upper fabric layer is formed by the binder yarns and with the interwoven upper cross-connected threads extending itself transverse to the binder yarns. The lower fabric layer is formed by the binder yarns and with the interwoven lower cross-linked threads extending itself transverse to the binder yarns. Each of the lower cross-connected threads is held respectively by the binder yarns. Each binder yarn on the external side of the lower fabric layer constantly crosses the respective lower cross-connected threads. The binder yarns holding the respective lower cross-connected threads are separated by a binder yarn not holding the lower cross-connected threads from one another, in which the lower cross-connected threads on the outer side of the lower fabric layer constantly cross the not holding binder yarns. With lower cross-connected threads, a same number of not holding binder yarns is arranged between the binder yarns holding the lower cross-connected thread. For each lower cross-connected thread, binder yarns not holding the cross-linked threads are arranged between successive binder yarns holding the respective lower cross-connected threads. The number of the binder yarns not holding the cross-connected threads is six. The upper fabric layer is formed by the interwoven of the binder yarns with the upper cross-linked threads. The weaving pattern of the upper fabric layer is itself repeated upwardly. The binder yarns are arranged in groups and the binder yarns of each group are alternated itself in sections when interwoven with the upper cross-connected threads in longitudinal thread direction. Each group of binder yarns forms an upper longitudinal thread progressing with binder yarns elevations and -lowering, which is repeated itself after the length of the upper repeats in the longitudinal direction. The binder yarns weaving the respective upper cross-connected threads of a group on the outer side of the upper fabric layer constantly cross an upper cross-connected thread. A binder yarn lowering is formed, in which the binder yarns weaving the respective upper cross-connected threads of a group between upper and lower fabric layer constantly cross an upper cross-connected threads. The binder yarn elevation and binder yarn lowering of the weaving pattern of the upper fabric layer are irregularly arranged in the upper repeat. The irregular structure of the upper weaving pattern is formed, in which in the upper repeat two longitudinal thread progressions are optionally produced in such a manner that one of the two longitudinal thread processing is produced not by the displacement of all of its binder yarn elevation or lowering around a same number of upper cross-connected threads in longitudinal thread direction. The irregular structure of the upper weaving pattern is formed by free textile processing, modification of a textile basic weave, derivative of a textile basic weave and extension of a textile basic weave basic weave. The ratio of upper cross-connected threads to lower cross-connected threads is 2:1, 3:2 or 4:3. The upper fabric layer comprises >= 14 upper cross-connected threads. The lower fabric layer comprises >= 7 lower cross-connected threads. The binder yarns in seven groups are arranged to every two-binder yarn. The total repeats of the paper-making screen comprise >= 24, >= 26, >= 32 or >= 48 more longitudinal threads and/or upper and lower cross-connected threads. The binder yarns are chaining threads and the cross-connected threads are filling yarns and vice versa.

Description

The invention relates to a papermaking wire, in particular a forming fabric, according to the preamble of patent claim 1.

Such a paper machine screen is for example from the document US 6,145,550 known.

Forming fabrics are used in the forming section of a paper machine. During the forming process, a fiber suspension is applied from the headbox of the paper machine to a forming fabric or to two forming fabrics (Gap - Former). An object of the forming fabric here is to dewater the fiber suspension and form a fibrous web, as little as possible pulp fibers and fillers from the fiber suspension should be washed during the dewatering process.

The quality of the fibrous web formed is strongly influenced by the structure of the fibrous web-facing surface (paper side) of the forming fabric. On the other hand, the life of the forming fabric is greatly affected by the structure of the paper machine facing surface (machine side) of the forming fabric.

In order to be able to take these partly conflicting requirements into account, multilayer paper machine screens with a paper-side and a machine-side fabric layer have been developed, wherein the two fabric layers are connected to each other by so-called binding threads. In order to ensure the most uniform possible paper-side fabric structure, the binding threads are preferably an integral part of the paper-side weave structure (integral binding threads), whereby marking tendencies are reduced due to the connection of the stitching threads.

The multi-layer forming fabrics known from the prior art, despite a paper-side and a machine-side fabric layer often, especially when used in high-speed paper machines, an insufficient wear resistance due to a partially uneven abrasion of the machine side of the screen.

The uneven abrasion is due to a poor planarity of the machine side of the known paper machine fabrics. The imperfect flatness is due, inter alia, to an uneven distribution of the binding points, i. the points where a binding thread runs on the machine side of the lower fabric layer and crosses a thread of the lower fabric layer. Furthermore, the uneven abrasion due to each unequal Flottierungslängen between successive binding points of at least individual on the outside of the machine-side fabric layer floating weft threads, which are known to have the task to protect the load-absorbing warp threads.

The uneven connection of the two fabric layers also has an often insufficient planarity of the paper side result, whereby the tendency to mark is significantly increased, especially in graphic papers.

Furthermore, the forming fabrics known from the prior art, in particular those used in high-speed paper machines (machine speeds of 1500 m / min and more), often have too high water drag due to too high a thickness of the wire.

The too high thickness of the screen is often caused by an insufficient connection of the paper side fabric layer with the machine side fabric layer through the binding threads.

An insufficient connection between paper-side and machine-side fabric layer also results in the operation of the papermaking fabric in the paper machine to a relative movement between the two fabric layers, whereby an abrasion between them arises, which can lead to the failure of such screens.

It is the object of the present invention to propose a paper machine screen in which the connection between the paper and machine side fabric layers are improved and thus the disadvantages described above occur at least reduced.

The object is achieved by the features of claim 1.

The papermaker's fabric according to the invention is characterized in that the binding thread elevations and binding thread decreases of the weave pattern of the upper fabric layer are arranged distributed irregularly in the upper repeat.

The fact that in several of the lower transverse threads between successive, the lower transverse thread each holding binding threads are always arranged an equal number of non-retaining binding threads, it is achieved that each of these transverse threads between successive points where this is held by a binder thread, so-called. Binding sites of the upper tissue to the lower tissue, always the same Fleet lengths on the outside of the lower fabric, ie on the machine side, the papermachine has.

Due to the same float lengths of the transverse threads between the binding points, a uniformly distributed connection of the upper to the lower fabric layer is provided, for which reason a papermaking fabric is provided with a significantly improved planarity of the machine and paper side with respect to the prior art.

Due to the uniform distribution of the binding sites, the holding force can furthermore be uniformly distributed, as a result of which a significantly stronger connection between the two fabric layers can be achieved, as a result of which their relative movement to one another can be reduced to a minimum, which leads to a minimization of the internal wear of the paper machine wire according to the invention ,

In addition, the uniform distribution of the binding sites and the possible stronger attachment of the upper to the lower fabric layer leads to a reduced total thickness of the paper machine fabric according to the invention in comparison to the screens known from the prior art.

By the same Flottierungslängen the transverse threads between the binding points of a further uniformly distributed wear volume is created on the outside of the lower fabric (machine side) extending lower transverse threads, which thus protect the load-absorbing binding threads.

According to the invention, it is thus conceivable that, in the case of a lower transverse thread, the number of non-retaining binding threads which are arranged between successive retaining binding threads is five and seven in the case of another lower transverse thread.

Advantageous embodiments and further developments of the invention are specified in the subclaims.

According to a preferred embodiment of the invention it is provided that for each lower transverse thread between successive, the lower transverse thread each holding binding threads are always arranged an equal number of the transverse thread not holding binding threads. The fact that all the lower transverse threads always have the same float length per se and with respect to the other lower transverse threads, the uniformity of the binding points is further increased, so that the above-described positive effects are enhanced in this embodiment.

Preferably, the number of binding threads not holding the respective transverse thread is between two and twenty, preferably between six and ten. Tests have shown that with the same float lengths of between two and twenty binding threads not holding the respective lower transverse thread a good connection between upper and lower fabric layer can be provided, coupled with improved wear resistance, in particular for use in paper machines at speeds of 1500 m / min or more.

According to a further embodiment of the invention, it is provided that the irregular structure is formed by at least two Längsfadenverläufe are formed in the upper repeat that one of the two Längsfadenverläufe not by displacement of all its binding thread elevations and depressions by an equal number of upper transverse threads in the longitudinal thread direction can be generated from the other of the two longitudinal thread courses.

Due to the fact that the upper repeat comprises at least two longitudinal thread courses in which one of the two longitudinal thread courses can not be generated by displacing all of its binder thread elevations and depressions by an equal number of upper transverse threads in the longitudinal thread direction from the other of the two longitudinal thread courses Binding diagonals and regular structures on the paper side reduced, resulting in a reduction of the marking of the paper machine screen produced with the paper.

In this case, the upper fabric layer preferably comprises upper transverse threads or upper transverse threads and binding threads which have a diameter in the range of 0.03 to 0.5 mm, preferably 0.08 to 0.15 mm. As a result, a particularly fine and mark-free paper page can be created.

In order to obtain a nearly completely irregular paper side of the inventive sieve, a further particularly preferred development of the invention provides that none of the longitudinal thread courses in the upper repeat by offset all its binder thread elevations and depressions by an equal number of upper transverse threads in the longitudinal direction of a different thread Create longitudinal thread course. This means that each longitudinal thread course in the upper repeat in its Bindefadenhebungs- and lowering sequence is different from the other Längsfadenverläufen. Such bonds are called creping bonds.

Furthermore, it is conceivable that the irregular paper-side weave structure is provided by the fact that the upper weave structure comprises a number of mutually different longitudinal thread courses, wherein the number of mutually different longitudinal thread courses is less than the number of longitudinal thread courses forming the upper repeat.

In this embodiment, the mutually different longitudinal thread paths are arranged in a non-repetitive order over the entire upper repeat. The resulting longitudinal thread repeat can then be very large, for example, 12 longitudinal thread courses include, wherein the number of mutually different longitudinal thread paths, for example, is only four. This means that a very large binding can be woven with only a small number of shafts for the paper side. The order of the longitudinal thread courses can, for example, be as follows: $$1-2-3-1-4-1-2-3-4-2-3-1$$

Also, such a bond is referred to as Kreppbindung.

• freie textile Entwicklung, Veränderung einer textilen Grundbindung, Ableitung einer textilen Grundbindung, Erweiterung einer textilen Grundbindung.

Binding technically, the irregular structure of the upper fabric layer can be formed alone or in combination by:

• Free textile development, alteration of a textile basic weave, derivation of a textile basic weave, extension of a textile basic weave.

In order to provide a paper page with good fiber support on the one hand and on the other hand an open machine side to provide a good drainage performance of the papermaking machine, is provided according to a particularly advantageous embodiment of the invention that the ratio of upper transverse threads to lower transverse threads greater than 1, in particular 2: 1, third : 2 or 4: 3 is.

According to a specific embodiment of the invention, the upper fabric layer of the papermaking fabric comprises fourteen or more upper transverse threads. Furthermore, the lower fabric layer comprises seven or more lower transverse threads. In this case, the binding threads are preferably arranged in seven groups of two binding threads each.

In order to increase the flexibility in the configuration of the upper and lower fabric layers of the papermachine fabric according to the invention, the overall repeat is preferably formed by a multiplicity of longitudinal threads and / or upper and lower transverse threads. Specifically, the overall repeat of the papermaker's fabric may include, for example, 24 or more or 26 or more or 32 or more or 48 or more longitudinal threads and / or 24 or more or 26 or more or 32 or more or 48 or more top and bottom transverse threads.

According to a specific embodiment of the invention, the binding threads are warp threads and the transverse threads are weft threads. In this case, it is a chain-bound system. But it is also possible that the binding threads are weft threads and the transverse threads are warp threads. In the latter case, it is a shotgun system.

Figur 1

den Kettfadenverlauf einer Ausführungsform eines erfindungsgemäßen Papiermaschinensiebs,

Figur 2

eine Darstellung der Papierseite des Papiermaschinensiebs der Figur 1 mit Ketthebungen und - senkungen,

Figur 3

eine Darstellung der Papier- und Maschinenseite des Papiermaschinensiebs der Figur 1.

The invention will be explained below with reference to an embodiment based on the following schematic not to scale drawings. Show it:

FIG. 1

the warp thread of an embodiment of a papermaker's fabric according to the invention,

FIG. 2

a representation of the paper side of the papermaking fabric of FIG. 1 with chain elevations and countersinks,

FIG. 3

a representation of the paper and machine side of the papermaking fabric of FIG. 1 ,

The FIG. 1 1 shows an embodiment of a papermaking fabric 100 according to the invention in the form of a forming fabric in the longitudinal thread direction, the longitudinal yarn direction corresponding to the warp direction of the fabric 100.

The presentation of the FIG. 1a FIG. 12 shows an overall repeat of the weave structure of the papermaker's fabric 100.

The illustrated papermaking fabric 100 has upper transverse threads SO1 to SO14 and lower transverse threads SU1 to SU7, which are each formed as weft threads.

Like from the FIG. 1a It can be seen that the ratio of upper transverse threads SO1 to SO14 to lower transverse threads SU1 to SU7 is 2: 1.

Further, the papermaking fabric 100 has binding yarns B1a to B7b formed as warp yarns, wherein the binding yarns are respectively arranged in groups of binder yarn pairs B1a and B1b, B2a and B2b ....

The binding threads are interwoven with both the upper transverse threads SO1 to SO14 and with the lower transverse threads SU1 to SU7.

By interweaving the binding threads B1a to B7b with the upper transverse threads SO1 to SO14 an upper fabric layer is formed, the weave pattern, in particular from the Figures 2 and 3 can be seen repeated in upper reports, wherein the upper repeat extends in the longitudinal thread direction over the upper transverse threads SO1 to SO14 and in the transverse thread direction over the binding threads B1a to B7b. In this case, the upper fabric layer has an outer side 101 which forms the paper side of the papermachine fabric 100.

By interweaving the binding threads B1a to B7b with the lower transverse threads SU1 to SU7, a lower fabric layer is formed whose weave pattern is repeated in lower repeats, wherein the lower repeat in the longitudinal thread direction over the lower transverse threads SU1 to SU7 and in the transverse thread direction on the binding threads B1a extends to B7b. The lower fabric layer further includes an outer side 102 which forms the machine side of the papermaking fabric 100.

Accordingly, each binder thread B1a to B7b is interwoven in sections alternately with lower and upper transverse threads.

Since the binding threads B1a to B7b are interwoven with the lower and upper transverse threads, the upper fabric layer is connected to the lower fabric layer through this. In this case, each lower transverse thread is held in each case by a plurality of binding threads by each of these binding threads on the outer side 102 of the lower fabric layer continuously crosses the respective lower transverse thread, wherein all of the respective lower transverse thread holding binding threads are spaced from each other by six binding threads not holding the lower transverse thread, in that the lower transverse thread on the outside 102 of the lower fabric layer continuously crosses the non-retaining binding thread. Thus, according to the invention, an equal number of non-holding binding threads are always arranged in all lower transverse threads between successive binding threads each holding the lower transverse thread.

For example, the lower transverse thread SU2 is held in the overall repeat by the binding threads B1a and B4b, and between the retaining binding threads B1a and B4b the non-retaining binding threads B1b, B2a, B2b, B3a, B3b and B4a and further in the transverse thread direction of the repeat between the retaining binding threads B4b and B1a, the non-holding binding threads B5a, B5b, B6a, B6b, B7a and B7b are arranged.

Furthermore, for example, the lower transverse thread SU1 is held in the overall repeat by the binding threads B2a and B5b, the retaining threads B2b, B3a, B3b, B4a, B4b and B5a remaining between the holding binding threads B2a and B5b and further in the transverse thread direction of the repeat between the binding threads B2a and B5b holding binding threads B5b and B2a, the non-retaining binding threads B6a, B6b, B7a, B7b, B1a and B1b are arranged.

Thus, an equal number of non-holding binding threads are always arranged between successive retaining binding threads for each lower transverse thread.

Furthermore, the number of non-binding binding threads for all transverse threads is the same and in the present embodiment is the number six.

As already mentioned, by weaving the binding threads B1a to B7b with the upper transverse threads SO1 to SO14, an upper weave pattern is formed, which repeats in upper rapports, the binding threads B1a to B7b being arranged in groups.

Like from the FIG. 1 can be seen, change and the binding threads of each group, for example, B1a and B1b, when interweaving with the upper transverse threads SO1 to SO14 in the longitudinal direction of thread sections, whereby each group of binding threads B1a and B1b, B2a and B2b, B3a and B3b, B4a and B4b, B5a and B5b, B6a and B6b, B7a and B7b, by interweaving with the upper transverse threads SO1 to SO14, an upper longitudinal thread course V1 to V7 with binding thread bumps (black boxes in FIG FIG. 2 ) and binding decreases (white boxes in FIG. 2 ).

Thus, a binder thread interweaves the group with the upper transverse threads when the other binder thread interweaves the group with lower transverse threads and vice versa. Furthermore, the binding threads of each group intersect at the intersection of interweaving with lower transverse threads for interweaving with upper transverse threads at intersections, such as those from the FIG. 1b becomes apparent, in which the two binding threads B1a and B1b intersect at the intersections K1 and K2.

In this case, the binding threads of each group are interwoven with the upper transverse threads SO1 to SO14 and with the lower transverse threads SU1 to SU7 such that two intersection points are arranged along the length of the upper repeat.

Thus, for example, the binding thread pair B1a and B1b forms by interweaving with the upper transverse threads SO1 to SO14 the upper longitudinal thread course V1, which repeats along the length of the upper repeat in the longitudinal thread direction.

A binding thread lift is formed here by the binding thread, eg B1a, which weaves the upper transverse threads in each case, continuously crosses an upper transverse thread, for example SO7, of a group on the outside 101 of the upper fabric layer. A binding thread decrease is formed here by the binding thread, eg B1a, which weaves in each case the upper transverse threads, continuously crosses an upper transverse thread, for example SO8, of a group between the upper and lower fabric layers.

The FIG. 2 shows a schematic plan view of the paper side forming outer side 101 of the upper fabric layer of the papermaking fabric. As in particular from the FIG. 2 can be seen, the upper repeat is formed by the upper longitudinal thread courses V1 to V7 along the upper transverse threads SO1 to SO14.

The paper side 101 has an irregular structure, in that none of the upper longitudinal yarn courses V1 to V7 in the upper repeat by displacing all of its longitudinal thread bumps (black boxes) and longitudinal thread bumps (white boxes) by an equal number of upper transverse threads in the longitudinal thread direction from another upper longitudinal thread course V1 to V7 of the repeat. Thus, for example, the longitudinal thread course V1 can not be generated by shifting one of the other longitudinal thread courses V2 to V7 by a number of transverse threads.

The FIG. 3 shows a representation of the paper and machine side of the papermaker's fabric 100 according to the invention.

Black boxes at crossing points of binding yarns (B) with upper transverse threads (SO) represent paper-side binder thread humps, as white boxes at crossing points of binding yarns (B) with upper transverse threads (SO) represent paper-side binder thread decreases.

Further, white boxes at intersections of binding yarns (B) with lower transverse threads (SO) present places where the respective lower transverse thread on the outside of the lower fabric layer, i. Machine side, runs as boxes with a vertical bar represent crossing points at which the respective binder thread (B) on the outside of the lower fabric layer, i. Machine side, running, i. a lower transverse thread is held by the binding thread.

Claims (13)

1. Papermaking fabric (100), especially a forming fabric, having an upper woven layer; the outer side (101) of which forms a paper side of the papermaking fabric (100), having a lower woven layer, the outer side (102) of which forms a machine side of the papermaking fabric (100), and having binding threads (B1a-B7b) extending in the longitudinal thread direction, which connect the upper and lower woven layer to each other,

   - the upper woven layer being formed at least by the binding threads (B1a-B7b) and upper transverse threads (S0) woven with these and extending transversely with respect to the binding threads (B1a-B7b)

   - the lower woven layer being formed at least by the binding threads (B1a-B7b) and lower transverse threads (S4) woven with these and extending transversely with respect to the binding threads (B1a-B7b),

   - each lower transverse thread (S4) in each case being held by a plurality of binding threads (B1a-B7b), by each of these binding threads (B1a-B7b), running on the outer side (102) of the lower woven layer, crossing the respective lower transverse thread (S4),

   - at least some of the binding threads (B1a-B7b) holding the one respective lower transverse thread (S4) being spaced apart from one another by at least one binding thread (B1a-B7b) not holding the lower transverse thread (S4), by the lower transverse thread (S4), running on the outer side (102) of the lower woven layer, crossing the non-holding binding thread (B1a-B7b),

   - a plurality of lower transverse threads (S4) being provided, in which in each case between successive binding threads (B1a-B7b) holding the respective lower transverse thread (S4) there are arranged an equal number of non-holding binding threads (B1a-B7b), and

   - the upper woven layer being formed by weaving the binding threads (B1a-B7b) with the upper transverse threads (S0), the weaving pattern of the upper woven layer being repeated in upper repeats, the binding threads (B1a-B7b) being arranged in groups and the binding threads (B1a-B7b) of each group, as they are woven with the upper transverse threads (S0), alternating section by section in the longitudinal thread direction, as a result of which each group of binding threads (B1a-B7b), as a result of being woven with the upper transverse threads (SO), forms an upper longitudinal thread course (V1-V7) having raised binding threads and dropped binding threads, which is repeated in the longitudinal thread direction in accordance with the length of the upper repeat, a raised binding thread being formed by the binding thread (B1a-B7b) of a group weaving the respective upper transverse threads (S0), running on the outer side (101) of the upper woven layer, crossing an upper transverse thread (SO), a dropped binding thread being formed by the binding threads of a group weaving the respective upper transverse threads (S0), running between the upper and lower fabric layer, crossing an upper transverse thread (S0),

   characterized in that
   the raised binding threads and dropped binding threads of the weaving pattern of the upper woven layer are arranged distributed irregularly in the upper repeat.
2. Papermaking fabric (100) according to Claim 1,
   characterized in that
   for each lower transverse thread (S4) between successive binding threads (B1a-B7b) respectively holding the lower transverse thread (S4) there is always arranged an identical number of binding threads (B1a-B7b) not holding the transverse thread (S4).
3. Papermaking fabric (100) according to Claim 1 or 2,
   characterized in that
   the number of binding threads (B1a-B7b) not holding the respective transverse thread (S4) is between two and ten, preferably six.
4. Papermaking fabric (100) according to one of Claims 1 to 3,
   characterized in that
   the irregular structure of the upper weaving pattern is formed in that, in the upper repeat, at least two longitudinal thread courses (V1-V7) are formed in such a way that one of the two longitudinal thread courses (V1-V7) cannot be produced from the other of the two longitudinal thread courses (V1-V7) by offsetting all its raised binding threads and dropped binding threads by an identical number of upper transverse threads (S0) in the longitudinal thread direction.
5. Papermaking fabric (100) according to Claim 4,
   characterized in that
   none of the longitudinal thread courses (V1-V7) in the upper repeat can be produced from another longitudinal thread course (V1-V7) by offsetting all its raised binding threads and dropped binding threads by an identical number of upper transverse threads (S0) in the longitudinal thread direction.
6. Papermaking fabric (100) according to Claim 4 or 5,
   characterized in that
   the irregular structure of the upper weaving pattern is formed, on its own or in combination, by:

   free textile development, changing a basic textile weave, deriving from a basic textile weave, expanding a basic textile weave.
7. Papermaking fabric (100) according to one of Claims 1 to 6,
   characterized in that
   the ratio of upper transverse threads (S0) to lower transverse threads (S0) is greater than 1, in particular 2:1, 3:2 or 4:3.
8. Papermaking fabric (100) according to one of Claims 1 to 7,
   characterized in that
   the upper woven layer comprises 14 or more upper transverse threads (S0).
9. Papermaking fabric (100) according to one of Claims 1 to 8,
   characterized in that
   the lower woven layer comprises 7 or more lower transverse threads (S4).
10. Papermaking fabric (100) according to one of Claims 1 to 9,
    characterized in that
    the binding threads (B1a-B7b) are arranged in seven groups of two binding threads (B1a-B7b) in each case.
11. Papermaking fabric (100) according to one of Claims 1 to 10,
    characterized in that
    the overall repeat of the papermaking fabric comprises 24 or more or 26 or more or 32 or more or 48 or more longitudinal threads and/or upper (S0) and lower transverse threads (S4).
12. Papermaking fabric (100) according to one of Claims 1 to 11,
    characterized in that
    the binding threads (B1a-B7b) are warp threads and the transverse threads (S0, S4) are weft threads.
13. Papermaking fabric (100) according to one of Claims 1 to 11,
    characterized in that
    the binding threads (B1a-B7b) are weft threads and the transverse threads (S0, S4) are warp threads.

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