EP2510151A1

EP2510151A1 - Fabric strip for a machine for producing web material, in particular paper or carton

Info

Publication number: EP2510151A1
Application number: EP10773907A
Authority: EP
Inventors: Matthias Hoehsl; Johann Boeck
Original assignee: Voith Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2009-12-11
Filing date: 2010-11-03
Publication date: 2012-10-17
Anticipated expiration: 2030-11-03
Also published as: KR20120093431A; DE102009054534A1; US8574403B2; US20120291975A1; CA2783747A1; WO2011069755A1; EP2510151B1; JP2013513732A; CN102822415A

Abstract

The invention relates to a fabric strip for a machine for producing web material, in particular paper or carton, comprising a first fabric layer (114) on the web material side and a second fabric layer (116) on the machine side, wherein the first fabric layer (114) and the second fabric layer (116) each have a base weave, connected to each other by binding threads (i1-i20) extending in a binding thread direction, having base binding threads (1-50, 118, 120) extending in the binding thread direction and crosswise to the binding thread direction, wherein the binding threads (i1-i20) form binding segments (S²) which are successive in the binding thread direction in the second fabric layer (116) and in which the binding threads (i1-i20) are set on at least one base binding thread of the second fabric layer (116) extending crosswise to the binding thread direction, wherein the binding segments (S²) formed in the second fabric layer (116) are arranged in a binding pattern repeat extended in the binding thread direction and crosswise to the binding thread direction along at least one binding segment diagonal (D) running skewed to the binding thread direction and crosswise to the binding thread direction.

Description

Fabric tape for a machine for producing web material,

especially paper or cardboard

The present invention relates to a fabric tape for a machine for producing web material, in particular paper or cardboard, comprising a web material side first fabric layer and a machine side second fabric layer, the first fabric layer and the second fabric layer respective base bonds interconnected by binding yarns extending in a binder thread direction have respective binding threads in the binding thread direction and transverse to the binding thread direction, wherein the binding threads in the second fabric layer in binding thread direction form successive binding segments in which the binding threads are bonded to at least one transverse binding yarn direction extending base binding thread of the second fabric layer.

WO 2008/068317 A1 discloses such a fabric strip for a machine for producing web material, in which the two fabric layers constructed with respective basic bindings are connected to one another by binding threads assigned in pairs and lying directly next to one another. The binding threads of a respective pair of binder threads change between the two layers of fabric at respective change points, so that they form binding segments in the paper-side first fabric layer on the one hand and the running-side or machine-side second fabric layer on the other hand. Such a binding segment extends over at least one base weave thread of the respective fabric layers extending transversely to the binder thread direction, over which a respective binder thread binds. Abbindet means here that the binding thread at the of the other fabric layer side facing away from a Grundbindungsfadens and thus binds this Grundbindungsfaden and thus the entire basic weave to the respective other fabric layer. From this document binding thread segments, especially in the first fabric layer formed binder thread segments are known, for example, extend over five Grundbindungsfäden, wherein the binder thread involved binds over the first, the third and the fifth ground weave thread of each binding segment, in the intermediate second and fourth basic binding threads, however, is guided on the inner side facing the second fabric layer. Thus, the binding threads, where they form binding segments in the first fabric layer, continue to form the plain weave of the first fabric layer, here a plain weave, so that the two threads of a respective pair of binder threads continue to form an apparent ground weave thread of the first fabric layer in the binding thread direction.

The very regular weave pattern of the first fabric layer, in this case provided by a plain weave continuing essentially over the entire first fabric layer, is superimposed on a comparatively irregular pattern of the binding segments in the second fabric layer. Attempts have been made to reduce as far as possible the marking tendency which such binding segments can bring about by avoiding any regularity, ie providing an arbitrary distribution of the binding segments in the second fabric layer within a binder thread repeat extending in the direction of the binding thread and transversely thereto.

It is the object of the present invention, a fabric tape for a machine for producing web material, in particular paper or cardboard, so for example a forming fabric to design such that a further reduction of the marking tendency can be achieved.

According to the invention, this object is achieved by a fabric tape for a machine for producing web material, in particular paper or cardboard, comprising a web-first side fabric layer and a second fabric layer on the machine side, the first fabric layer and the second fabric layer having respective base weaves interconnected by binder yarns extending in a binder yarn direction with respective base weave yarns extending in the binder yarn direction and across the binder yarn direction, said binder yarns in said second fabric layer form binding segments in successive binding segments, in which the binding threads are bonded to at least one binding thread direction of the second fabric layer, wherein in a binder yarn repeat and transverse to the binding yarn direction stretched binder repeat formed in the second fabric layer binding segments at least one along the binding yarn direction and are arranged transversely to the binding thread direction obliquely extending binding segment diagonal.

It was recognized on the basis of the known from WO 2008/068317 A1 embodiment of such a fabric tape that when arranging the existing in the second, so running side or machine side fabric layer binding segments in the most arbitrary manner clustering occurs, i. a local accumulation of binding segments in which the binding segment density is significantly higher than in other areas. This uncontrolled clustering leads to an unexpected strong marking tendency, which was not to be expected due to the arbitrary distribution of the binding segments.

The present invention counteracts this problem by deviating from a completely arbitrary distribution for the binding segments arranged in the second fabric layer and proceeding to greater regularity by virtue of the or substantially all binding segments within a respective binder thread repeat along the direction of the binding thread or obliquely placed transversely to the binding yarn direction, ie diagonal cross-diagonal diagonals are arranged. In one Thus, in each case, a plurality of virtual lines along which the binding segments are arranged frequently, so that although a certain local accumulation is present, this is given a certain order and thus regularity by aligning along respective diagonals. It has been shown that thus a significantly reduced tendency to mark can be achieved.

In the fabric tape constructed in accordance with the invention, adjacent binding threads may form a pair of binding threads, wherein preferably the binding threads of a pair of binding threads are immediately adjacent to each other.

In an alternative embodiment, it is possible that between the binding threads of a pair of binder threads at least one binding thread in the direction of binding Grundbindungsfaden the second fabric layer and / or arranged at least one binding thread direction extending base binding thread of the first fabric layer.

In particular, when the fabric tape is formed with two fabric layers, they can be stably connected by the binding threads in that the binding threads in the first fabric layer in binding thread direction successive binding segments in which the binding threads on at least one transverse to the binding thread direction extending base binding thread of first fabric layer are tied. In order to be able to provide a stable cohesion between the fabric layers through the binding threads with the possibility of being able to continue the binding pattern produced by the basic binding threads in the first fabric layer, but at the same time being able to provide a certain degree of regularity for the first fabric layer, it is further proposed that At changing points, the binding threads of a respective pair of binder threads intersect each other and one of the binding threads for forming a binding segment in the first fabric layer changes into these and the change points in one Bindefadenrapport along a plurality of Wechselstellendiagonalen are arranged.

In this case, the Wechselstellendiagonalen can run parallel to the binding segment, which is due to the fact that where binder segments are formed in the second fabric layer, no change points can be present, it is ensured that overlapping diagonals can not occur. In an alternative variant, it can be provided that the changeover diagonals are angled with respect to the binding segment diagonal.

In order to interrupt the introduced by the arrangement of change points along Wechselstellendiagonalen regular pattern in certain areas and to achieve an improved marking behavior by minor irregularities, it is proposed that the Wechselstellendiagonalen least one Wechselstellendiagonale a first kind with uninterrupted stringing together of change points and at least one Wechselstellendiagonale one second type with interrupted by Wechselstellen-Verstellstellen stringed together of change points.

Also, with the various kinds of alternate diagonals, irregularity superimposed on a regular pattern can be provided by alternately changing the alternate diodes of the first type and the second type of switching diagonals with a regular pattern.

Furthermore, it can be provided that the change point offset points are arranged in a regular pattern. It can further be provided that in the first fabric layer, binding segments of a binding thread of a pair of binder threads and binding segments of the other binding thread of the same pair of binder threads follow one another alternately in the binding thread direction.

A further reduction of the marking tendency can be achieved by an index ratio of binding segments in the first fabric layer to binding segments in the second fabric layer being greater than one. By providing a smaller number of binding segments in the second fabric layer, it becomes possible to leave a comparatively large gap between the individual binder segment diagonals.

It is further proposed that an number ratio of base binding threads extending transversely to the binding thread direction of the first fabric layer and of the base binding threads of the second fabric layer is greater than one. By providing such a ratio, it becomes possible to superimpose an aspect of the irregularity in the second fabric layer to the comparatively high regularity in the first fabric layer, with a correspondingly reduced marking tendency.

The pattern of incorporation of the binding threads into the second fabric layer may, for example, be such that, in at least one binding segment diagonal, substantially all successive binding segments are binding segments of the same type or / and formed by binding threads of the same type. The binding segments of the same type are basically characterized by the fact that the manner in which a respective binding thread binds with base binding threads of the second layer of fabric is the same, which can affect both the course of a respective binding thread, and the number of basic binding threads involved in the second layer of fabric. Binding threads of the same kind are distinguished by the fact that they have the same course, ie the same sequence of binding sites, with respect to one another in relation to the basic bindings of the various fabric layers with which they form binding segments Bindefadenlängsrichtung but can be offset. Binding threads of different types are distinguished by the fact that, independently of the fact that they can be offset with their respective pattern of incorporation into the fabric layers in the longitudinal direction of the binding thread, they have mutually different patterns of incorporation.

It can further be provided that binding segments of different types and / or binding segments formed by binding threads of different types follow one another in at least one binding segment diagonal, wherein preferably the binding segments contained in at least one binding segment diagonal of different types and / or binding segments formed by binding threads of different types alternate in a regular pattern , In this way, in the regularity formed by the binding segment diagonals, on the one hand, an aspect of the irregularity is provided, in that binding segments of different types or different binding threads follow each other, which then, however, contribute to a certain homogeneity through the regular pattern of mutual alternation.

In order to obtain a certain break in the regular pattern in the aspect of regularity formed by the binding segment diagonal, it is further proposed that a plurality of binding segment diagonals with mutually different distribution and / or type of binding segments and / or binding segments of different types formed binding segments are present in a binding pattern repeat ,

In a variant which is advantageous with regard to the simplest possible construction of the binding pattern, it is further proposed that in a binder thread repeat the number of pairs of binder threads having mutually different courses of the binding threads forming them is smaller than the number of binding thread pairs present in a binder thread repeat. Here, too, binding threads with a different course are distinguished by the fact that with respect to the basic weave or fabric layers with which they Form binding segments, have a different sequence of bonding sites and not only in the binding thread longitudinal direction offset from each other, but in principle then have the same sequence of bonding sites or the same pattern of involvement in the basic bonds.

In order to be able to provide a very high uniformity of the bonding structure, in particular in the first fabric layer, it is proposed that the binding threads of a pair of binder threads in the first fabric layer form an apparent ground weave thread of the first fabric layer continuing the binding of the first fabric layer.

It can further be provided that a repeat length of the binding threads in the binding thread direction is greater than a repeat length of the plain weave of the first fabric layer and / or the second fabric layer in the binding thread direction.

The invention further relates to a machine for producing web material, in particular paper or cardboard, which comprises at least one fabric tape designed according to the invention.

The present invention will be described below in detail with reference to the accompanying drawings. Show it:

1 a and 1 b for a binder thread repeat the course of the various binding threads involved and the distribution of binding segments formed in this binder thread repeat in a running side fabric layer.

Figure 1 c, the arrangement of binding segments in a paper side

Fabric layer and the change points formed between such binding segments for the binding pattern shown in Figures 1 a and 1 b;

Fig. 2a and 2b Figs. 1 a and 1 b corresponding representations of a alternative embodiment;

Fig. 3a and 3b Figures 1 a and 1 b corresponding representations of an alternative Ausgestaltungsart;

Figures 4a and 4b Figures 1 a and 1 b corresponding representations of an alternative Ausgestaltungsart;

Figures 5a and 5b Figures 1 a and 1 b corresponding representations of an alternative Ausgestaltungsart;

Fig. 5c shows the arrangement of binding segments in a paper-side

Fabric layer and the transition points formed between such binding segments for the bonding pattern shown in Figures 5a and 5b;

Figures 6a and 6b Figures 1 a and 1 b corresponding representations of an alternative Ausgestaltungsart;

Fig. 6c shows the arrangement of binding segments in a paper-side

Fabric layer and the transition points formed between such binding segments for the binding pattern shown in Figures 6a and 6b;

Figures 7a and 7b Figures 1 a and 1 b corresponding representations of an alternative Ausgestaltungsart;

Figures 8a and 8b Figures 1 a and 1 b corresponding representations of an alternative Ausgestaltungsart;

Figures 9a and 9b Figures 1 a and 1 b corresponding representations of an alternative Ausgestaltungsart;

Figures 10a and 10b Figures 1 a and 1 b corresponding representations of an alternative Ausgestaltungsart;

Fig. 10c shows the arrangement of binding segments in a paper side

Fabric layer and the transition points formed between such binding segments for the binding pattern shown in Figures 10a and 10b;

Fig. 1 1 a binder thread pair and an associated pair of

Basic thread for an alternative

Plain weave pattern; Fig. 12 is a binder thread pair and an associated pair of

Basic binding threads for an alternative basic pattern;

FIG. 13 shows a binder thread pair and an associated pair of. FIG

Basic binding threads for an alternative basic pattern; and

FIG. 14 shows a binder thread pair and an associated pair of

Basic binding threads for an alternative basic binding pattern.

With reference to FIGS. 1 a, 1 b and 1 c, a first exemplary embodiment of a weave structure of a fabric tape for a machine for producing web material, such as, for example, is described below. As paper or cardboard described. Such, for example, used as a forming fabric fabric tape is constructed in the example shown in FIGS. 1 a and 1 b with two fabric layers 1 14, 1 16. The fabric layer 16 is a machine or running side, second fabric layer, which comes into contact with the various, leading the belt or driving rollers.

1 a shows a section running in the weft direction of such a fabric strip, so that the threads lying in the plane of the drawing are the weft threads and the threads shown numerically and perpendicular to the plane of the drawing are the warp threads of the fabric strip. In the sequence from top to bottom, all weft threads contained within a Bindenfadenrapportes and all contained in a Bindenfadenrapport warp threads are shown. The weft threads comprise on the one hand the weft threads 1 18 used for the plain weave of the first fabric layer 14 and the weft threads 120 used for the plain weave of the second fabric layer 16. These weft threads 1 18, 120 each remain in the first fabric layer 14 or the second fabric layer 1 16 and form there with the existing warp threads a respective basic commitment. It can be seen that the basic weave of the first fabric layer 1 14 is a plain weave, while the plain weave of the second fabric layer 16 is a five-atlas weave. That is, the weft threads 120 of the plain weave of the second fabric layer 1 16 floats over four warp threads of the second fabric layer 16 and thus provide a wear-resistant surface of the fabric tape which is very well protected against wear.

In order to provide a bond between the two fabric layers 1 14, 16, a total of ten pairs of binding threads are present in a respective binder thread repeat. These binding threads i1 -i2, i3-i4, i5-i6, i7-i8, i9-i10, M1-M2, M3-M4, M5-M6, i17-i18 and i19- assigned to each other in pairs i20 lie directly next to each other in the warp direction. The binding threads of a respective pair of binder threads change between the two layers of fabric 1 14, 16, so that in the pair of binding threads i1 -i2, for example under the warp threads 11, 18, 25, 35 and 45, change points of the binding threads i1, i2 result.

The binding threads of the respective pairs of binder threads are integrated into the first fabric layer 14 in such a way that they continue the plain weave, ie the plain weave. In particular, it can be seen that even by the multiple change of binding threads between the individual fabric layers 1 14, 1 16 in a binder repeat the two binding threads of a respective pair of binder yarns in the first, so paper-side fabric layer 1 14 integrated into the first fabric layer 1 14 and seemingly traversing form a fictitious basic thread.

Each of the binding threads i1 to i20 of a binding thread repeat forms a plurality of binding segments both in the first fabric layer 14 and in the second fabric layer 16 S ₂ . A binding segment is in each case formed by a section of the binding thread in question, in which the latter binds in a respective fabric layer 14 or 16 via at least one, possibly also several and not necessarily immediately adjacent warp threads. For example, the binding thread i1 of the uppermost pair of binding threads i1 -i2 forms in FIG. 1a a binding segment Si in the first fabric layer 14, which extends from the warp yarn 3 to the warp thread 10. Over the warp threads 3, 6 and 10, the binding thread 1 binds to the outside of the first fabric layer 1 14, that is, the side remote from the second fabric layer 16. He is guided under the warp threads 5, 8, so that there is the above-mentioned plain weave. Another binding segment Si in the first fabric layer 14 forms the binding yarn i1 with the warp threads 20, 21 and 23 or even another with the warp threads 36, 38, 40, 41, 43. The binding segments Si present in the first fabric layer 11 are each separated by a warp thread 1, 1 1, 18, 25, 35 and 45, which contributes equally to the preservation of the plain weave.

Binder segments S ₂ are likewise formed in the second fabric layer 1 16, wherein, for example, the first binder thread i 1 forms a binding segment S ₂ with the warp threads 14, 17. Another binding segment binds this binding thread i1 with the warp threads 27, 29. Here, therefore, the binding segments also comprise a plurality of warp threads, in particular two directly adjacent warp threads, so that in each binding segment S _{2 of} the binding thread i1, and equally also the binding thread i2 at the Running side floated over two warp threads.

Within the binding thread repeat shown in FIG. 1 a, which here thus provides the smallest repeat unit of the weave structure which successively successively sets the weft direction and the warp direction together, the entire weave structure yields a total of ten pairs of binder threads, basically there are only two types of differently bound binding threads. That is, all odd-numbered binding threads i1, i3, i19 have basically the same course with regard to the warp threads, but are offset with respect to one another in the weft direction. The same applies to the even numbered binding threads i2, i4, i20. It can further be seen that the distribution of the binding segments Si or S _{2 is} such that a larger number, namely six, binding segments S1 is present in the first fabric layer 14 than in the first fabric layer 14 second fabric layer 1 16, where within a binder yarn repeat only four binding segments S ₂ are present, which are separated from each other by three warp threads. This is due to the fact that each of the two binding threads of a respective pair of binding threads in the first fabric layer 14 forms two binding segments separated by a binding segment of the respective other binding thread, without intermittently changing into the second fabric layer 16.

1 b shows, viewed from the running side, the positioning of binding segments S ₂ in the second fabric layer 14. The columns numbered 2-49 of FIG. 1 b each form the warp threads of a binder thread repeat of the second fabric layer 16 while the lines represent the weft threads or here in particular the binding threads 1 - 20 provided by weft threads. The successive binding segments S ₂ , for example of the first pair of binding threads i 1 -i ₂ , are clearly recognizable, the sequence always being such that two binding segments S _{2 of} the binding thread of one type follow two binding segments S _{2 of} the other binding thread of the other type.

The arrangement of the binding segments S ₂ in the second fabric layer 1 16 is selected such that these binding segments S ₂ are arranged along binding segment diagonals D. These binding segment diagonals D extend both obliquely to the warp direction and obliquely to the weft direction. It can be seen that within a binder thread repeat there is a plurality of binding segment diagonals D extending substantially parallel to one another along which the binding segments S _{2 of} the second fabric layer 16 are arranged consecutively.

It has been found that by providing such binding segment diagonals D, along which the binding segments S _{2 of} the second fabric layer 16 are preferably arranged, a regularity deviating from a completely arbitrary distribution of the binding segments S ₂ is achieved in the second fabric layer 16 again a tendency to mark entails. In particular, this can avoid the resulting clustering in arbitrary positioning.

It can be seen in the representation of FIG. 1 b that a comparatively high degree of regularity is also present in the binding segment diagonals. In particular, the binding segments S _{2 of} a diagonal are each offset by a warp thread in the weft direction and overlap in a warp thread. In connection with the distribution of the warp threads on the two fabric layers 1 14 and 1 16 such that in the fabric layer 1 14 a larger number of warp threads is present, as in the fabric layer 1 16, thus therefore a certain irregularity in the superposition of the warp threads themselves is created, arranging the binding segments S ₂ along the binding segment diagonal D to a tissue band with very low tendency to mark. In Fig. 1 b further recognizes that in the individual binding segment diagonal D also with respect to the binding segments contained therein S _{2 is} a regularity. This is followed in each case by two binding segments S ₂ with binding threads of one type, ie with respect to the two fabric layers 14, 16, basically equally bound but offset to one another in the weft direction on two binding segments S ₂ , each formed with a binding thread of the other type are.

FIG. 1 c illustrates the position of the binding segments S <, which form a respective binding thread pair i 1, i 2,... I 19, i 20 in the first fabric layer 14. Thus, for example, in conjunction with FIG. 1 a, it can be seen that a binding segment Si is formed by the warp threads 3, 5, 6, 8 and 10 provided in the first fabric layer 14, by the binding thread i1 marked in FIG. 1c is. It then follows a change point W, at which the two binding threads of the pair of binding yarns i1, i2 cross here under the warp thread 1 1 of the first fabric layer 1 14, wherein the first between the two fabric layers 1 14, 1 16 extending binder thread i2 then forming a the warp threads 13, 15, 16 of the first fabric layer 1 14 further include Bindesegments Si in this first fabric layer 1 14 changes. At such a point of exchange W, which in the case just discussed is under a warp thread incorporated in the first fabric layer 11, the two binding threads of a pair of binder yarns alternate with each other for providing or continuing the weave pattern in the first fabric layer, by a first in the first Fabric layer 1 14 a binding segment Si forming binder thread is terminated or removed from the first fabric layer 14 and replaced by the other, this crossing binder thread of the same binder thread pair, which then provides a binding segment Si.

In Fig. 1 c it can be seen that the change points W along changeover diagonals D _w and D _w 'are arranged. There are two different types of changeover diagonals. The Wechselstellendiagonalen D _{w of} a first type are formed by a regularity not interrupting juxtaposition of change points W and extend in this high regularity through the binder repeat shown in FIG. 1 c through or continue on the adjacent Bindefadenrapporte away. The binding segment diagonals D _w 'of a second type have a sequence of change points W marked by interruptions. At change point offsets V missing in these diagonals D _w 'the second kind change points. These are shifted in the binding thread longitudinal direction to offset change points W _v . Compared to the alternating diagonals D _{w of} the first type formed with uninterrupted sequence of change points W so here Wechselstellendiagonalen D _w 'of the second kind are provided by the Wechselstellen- Versatzstellen V interrupted regularity in the juxtaposition of the change points W. In this case, the change point offset points V are arranged in regular sequence in these changeover diagonals D _w 'of the second type. Also, the offset change points W _{v are} in a respective binder thread repeat in a regular pattern, in the example shown also following one another along a diagonal.

It can be seen further in FIG. 1 c that a plurality of alternate diagonals D _{w of} the first type and D _w 'of the second type are provided in a binder thread repeat and these different types of alternating diagonals D _w , D _w ' alternate, ie also in a regular pattern alternate.

Basically, with the sequence of changing-digit _diagonals D _w , D _w 'illustrated in FIG. 1 c, an irregularity is superimposed on a very regular pattern in certain regions, which has an advantageous effect with regard to the marking tendency of a fabric band thus produced. Advantageously, it also has the effect that the change-point diagonals D _w and D _w ', which clearly result from a comparison with FIG. 1 b, extend at an angle in a respective binder thread repeat with respect to the binder segment diagonal D.

A modified embodiment of a fabric band or a woven structure within a respective binder thread repeat is shown in FIGS. 2a and 2b. With regard to the basic structure, reference may be made to the above statements. Again, the pairwise associated and adjacent binding threads of a respective pair of binder yarns, for example, the binding threads i1 and i2, in the first fabric layer 1 14 and the second fabric layer 1 16 form the binding segments Si, S _2nd In contrast to the preceding embodiment, it can be seen that, for example, with the binding thread i2 in the warp thread 4, binding segments S ₂ are present, which extend only over a single warp thread. This is also shown in FIG. 2b, where it can be seen that in each binding thread pair in a binder thread repeat, a binding segment S ₂ comprising only one warp thread is provided in each case. Again, the binding segments S ₂ are arranged along the binding segment diagonals. Since in these diagonal D now also tie segments are present, which comprise only one warp thread, the successive in the diagonal D binding segments S ₂ do not overlap all around a warp thread. Nevertheless, within the individual binding segment diagonal D again a comparatively high Regularity formed by the fact that in the individual binding segment diagonals D binding segments S _{2 of} different types change in a uniform sequence. Tie segments of various types in this case are provided by tie segments comprising a different number of warp threads. Tie segments of various kinds could in principle also differ in the manner in which they are connected to the warp threads. Thus, for example, binding segments comprising three warp threads can float over these three warp threads, but can also set in the manner of a plain weave over two warp threads separated by one of the warp threads.

FIGS. 3a and 3b show an embodiment variant in which the two binding threads, ie, for example, i1, i2, are separated by a weft thread 20 of the plain weave of the second fabric layer 16 in each binding thread pair. Also in this embodiment, binding segments S ₂ in the second fabric layer 1 16 are present in the binder thread repeat shown in each binding thread pair, which comprise only one warp thread. In the case of each pair of binder threads, a total of two binding segments S ₂ with one warp thread and two binding segments S ₂ with two warp threads are present. For each pair, the binding thread of one type always forms the binding segments S ₂ with two warp threads, while the binding thread of the other type forms the binding segments S ₂ with a warp thread.

As can be clearly seen from the illustration of FIG. 3b, a uniform sequence of binding segments of various types is again present in the individual binding segment diagonals D, with two binding segments of one type each, ie two binding segments with two warp threads, on two binding segments of the other type. So two binding segments with a warp thread, follow. In the embodiment variant shown in FIGS. 4a and 4b, the two binding threads of a respective pair of binder threads are again separated by a weft thread 20 of the plain weave of the second fabric layer. The second Fabric layer 1 16 formed binding segments S ₂ here comprise only a single warp thread, which is clearly visible in Fig. 4b. The binding segments S ₂ are arranged along the binding segment diagonal D, with groups of four binding segments S _{2 being} present in the diagonals D, which are separated from one another by a respective warp thread on which no binding segment is then formed at a respective diagonal. The individual groups of four each extend over three warp threads, the middle two binding segments being formed in a respective group of four on the same warp thread. Here, too, a relatively high degree of regularity is ensured within the binding segment diagonal by a distribution pattern continuing along the diagonal D. However, just as in the embodiments described above, the course of the binding segments S ₂ in the individual diagonal is the same in each case, so that the individual diagonals D are also identical in terms of the arrangement or distribution of binding segments S ₂ .

In the embodiments shown in FIGS. 2a, 2b to 4a, 4b, the course or the arrangement of the binding segments Si in the first, paper-side fabric layer 14 corresponds to the arrangement described above with reference to FIG. 1c. Again, therefore, the change points of the pairwise associated binding threads along the Wechselstellendiagonalen various types, as can be seen in Fig. 1 c, arranged.

FIGS. 5a and 5b show an embodiment variant in which the binding threads of a respective pair of binder threads which now again lie next to one another form segments S ₂ , each having a warp thread in the second fabric layer 16. The binding segments S ₂ are arranged along the binding segment diagonal D, in which case there are three diagonals D, D 'and D "of different types, and a uniform distribution of the binding segments S _{2 is} present in the respective diagonals D, D' and D". For example, in the diagonal D is a sequence of individually arranged binding segments and two in the warp direction immediately adjacent arranged binding segments available. In the diagonal D 'are each two groups of binding segments S ₂ are present, which are separated in the warp direction each by another pair of binder yarns. In the diagonal D "are individually arranged and each separated by a warp and two pairs of binder yarn binding S ₂ available.

Thus, although there is a somewhat greater irregularity since there are several different types of diagonals in a binder thread repeat, comparatively high regularity is again provided within the individual diagonals D, D 'and D ".

FIG. 5c, in association with the embodiment of a fabric tape shown in FIGS. 5a and 5b, again shows the position of the change points of the mutually associated binding threads i1, i2,... I19, i20 and the respectively formed in the first fabric layer 14 Binding segments Si. As in the case of FIG. 1 c, it can be seen that the sequence of binding segments Si formed from a respective pair of binder threads comprises in each case alternately a binding segment Si of one binding thread of a pair of binder threads and then a binding segment Si of the other binding thread of this pair of binding threads.

The change points W are again arranged along the change-point diagonals D _w and D _w '. In the exchange diagonal D _{w of} the first kind is again a regular and not interrupted sequence of change points W exists. In the changeover points diagonal D _w 'of the second kind, there are again offset points V and W _v offset change points which change the sequence of points in the diagonal of D _w' interrupt. In particular, it can be seen that in the case of one and the same pair of binding threads, for example the binding threads i3 and i4, between two changeover diagonals D _{w of} the first type, two change points W, W _{v can} lie, one of which lies on the changeover diagonal D _w 'of the second type, For example, the change point W formed on the warp thread 10, while another as offset change point W _v , that is, for example, the formed on the warp 16 Change point, offset lies. These additional change points or staggered change points W _v could ultimately also be regarded as change points defining a further diagonal of the second type. Indeed, in the embodiment of FIG. 5c, a plurality of alternate diodes D _w 'of the second type may be drawn between two alternate diodes D _{w of} the first type, all of which are characterized by being respectively one or more compared to the alternate diodes D _{w of} the first type. have a plurality of the interruption-free sequence of change points canceling interruptions.

Previously, with reference to FIGS. 1 a, 1 b to 5 a, 5 b fabric structures have been described, in which in a binder thread repeat next to each existing there binder thread pairs, here each ten pairs of binder yarns, twice the number of non-binding weft threads, ie only to the plain weave of individual fabric layers contributing weft threads, is present. In addition to the 20 weft threads providing the binding threads, there are thus a total of 40 basic binding weft threads which do not change the fabric layers and are integrated exclusively into the first fabric layer 14 or the second fabric layer 16. Here is a ratio of the binding weft threads to the non-binding weft threads of 1: 2 available. Embodiments will now be described with reference to FIGS. 6a, 6b to 10a, 10b, in which this ratio is 1: 1. So here are just as many non-binding weft threads available, as each binding thread pairs binding weft threads. In the embodiment illustrated in FIG. 6a, there are a total of ten pairs of mutually associated binding threads, with basically two binding thread pairs that exist with regard to the course of the thread. It can be seen, for example, that the binding thread i5 has the same course as the binding thread i1 with respect to the different warp threads with which it forms binding segments Si and S ₂ , but with respect to the latter in the weft direction. The same applies to the binding threads i2 and i6. However, the binding threads i1 and i3 or the binding threads i2 and i4 differ with respect to their binding to the warp threads. This leads, for example, to a Binding thread pair with the binding threads i1, i2 in the first fabric layer 1 14 a sequence of binding segments Si is present, which is 2-3-3-2-3-2, wherein the respective number indicated the number of in a respective binding segment Si outside of a warp threads i1 or i2 surrounded warp threads of the first fabric layer 14. For the binding thread pair i3-i4, the sequence is as follows 3-2-3-2-3-2. This sequence of binding segments Si of different types, that is to say in each case a different number of included warp threads, then changes alternately within a respective binder thread repeat. In the embodiment variant shown in FIGS. 6a and 6b, the binding segments S _{2 of} the second fabric layer 1 16 are oriented along binding segment diagonals D. Since each binding thread forms binding segments of various types, that is to say binding segments comprising a warp thread on the one hand and binding segments comprising two warp threads on the other hand, a sequence of binding segments of different types is present in each binding thread pair. This results in two different diagonals D and D 'arise. In each diagonal D or D 'binding segments S _{2 of} different types are included, but evenly distributed in their sequence along the diagonal D or D' again.

FIG. 6c again shows the position of the change points W or of the binding segments Si in the first fabric layer 1 14. The changeover diagonals D _{w can be seen} in which a regular and uninterrupted sequence of change points W is present. This does not preclude that here, viewed in the longitudinal direction of the binding threads, between two change points W a Wechselstellendiagonale D _{w of} the first kind is a transverse to the binding thread longitudinal direction, ie in the warp direction thread of the first fabric layer is present, at least in association with this Changeover diagonal no change point is formed. This uninterrupted sequence of change points is canceled in the Wechselstellendiagonalen D _w 'of the second type, that in the binder thread repeat each a change points offset point V exists in which the regular sequence is interrupted. Assigned to each change point offset point V is an offset change point W _v , which is shifted in the binding thread longitudinal direction by two warp threads. A comparison with FIG. 6b shows that in this embodiment variant, the change-point diagonals D _w and D _w 'and the binding segment diagonals D and D' do not run angled with respect to each other, but run parallel to one another. Since, however, where 16 binding segments and thus also binding segment diagonals are formed in the second fabric layer 1, it is ensured that the diagonals extending parallel to one another are not offset one above the other but transversely to the diagonal longitudinal direction.

With reference to FIG. 6a, in this exemplary embodiment, another example of a change point W is illustrated, for example, with reference to the binding threads i1 and i2. Thus, it can be seen that the binding yarn i1, after forming a binding segment Si at the yarns 28, 30, 31 extending transversely to the binding yarn longitudinal direction, changes directly into the second fabric layer 16 under the yarn 34 present there, ie, none, before the yarn 33 Extending portion has, in which it passes between the two fabric layers 1 14, 1 16 or respectively disposed there transverse threads, as is the case for example at the same transition point W in the binding yarn i2 in front of the transverse thread 32 in a position between the two Fabric layers 1 14, 1 16 changes, and extends between the transverse threads 31, 32 on the one hand and then the transverse threads 33, 34 on the other hand through and thereby crosses the binding yarn i1 changing directly from the first fabric layer 1 14 in the second fabric layer 1 16.

FIGS. 7a and 7b show a modification of the embodiment described above, in which binding segments Si formed in the first fabric layer 14, in the case of a type of pair of binder threads, again refer to the wrapped warp threads as follows: 2-3-3-2-3-2, while for the other type of binder thread pair the sequence is as follows: 3-2-3-2-3-2. Here, too, basically only four different binder thread courses with correspondingly only two different pairs of binder thread pairs within the illustrated Bindefäden rapportes used.

The binding segments S ₂ formed in the second fabric layer 1 16 are arranged along the diagonals D and D ', wherein within the binder segment diagonal D, in particular recognizable by the diagonal D, a comparatively large regularity by a similar repetition of the pattern of the positioning of the binding segments Type of binding segments or the type of binding threads used to form the binding segments is achieved.

Figs. 8a and 8b show a mode of embodiment in which the two types of binder thread pairs are each formed with the sequence of binding segments Si in the first fabric layer, which is as follows: 2-3-3-2-3-2 and 3-2, respectively -3-2-3-2. Here, too, four different binder thread pair courses are used to generate two different pairs of binder thread, which then alternate alternately within a binder thread repeat in the warp direction. The binding segments S _{2 of} the second fabric layer are arranged lying along the binding segment diagonals D, D '.

With regard to the previously explained FIGS. 7a, 7b, 8a, 8b, it should be noted that the bonding patterns shown there correspond to the configuration explained above with reference to FIG. 6c with regard to the positioning of the change points or the binding segments in the first fabric layer 11.

While six binding segments Si are present in each of the embodiments described above in the first fabric layer, in the embodiment shown in FIG. 9 in the first fabric layer 11, a binder thread pair with a number of eight binding segments Si is additionally present alternately. The number of binding segments S ₂ in the second fabric layer 1 16 present in a respective pair of binder yarns is six here. This can also be seen from Fig. 9b, where in association with each Bindefadenpaar six such binding segments S ₂ can be seen. In this case, the binding thread pairs of different types differ in that in one type, for example in the binding thread pair i1, i2, only binding segments S _{2 are} formed which comprise a single warp thread, while in the binding thread pair of another type, thus for example the binding threads i3, i4, in each case a binding segment S _{2 is} formed, in which the associated binding thread floats over two warp threads away.

Because of this larger number and the different type of binding segments, the binding segments are again aligned along binding segment diagonals, with a larger number of diagonals D, D ', D "and D'" occurring in a binding thread repeat. It can be seen that the binding segments of different diagonals can, for example, continue to touch each other in the warp direction, ie they can lie next to one another in the warp direction. In the individual diagonals there is a high degree of regularity in the sequence of the binding segments arranged there. In particular, it can also be seen that binding segment diagonal D '"comprising binding segments of various types in each case has an alternating sequence of a binding segment comprising only one warp thread and a binding segment comprising two warp threads with a subsequent separation from a warp thread.

The embodiment variant shown in FIGS. 10a and 10b also includes eight binding segments Si in the first fabric layer 1 in each second pair of binder threads. Here, too, basically two types of pairs of binder threads, ie four different binder thread courses, are present, with each second pair of binder threads Binding thread between two provided by these binding segments Si comparatively long, namely over five in the first fabric layer 1 14 existing warp threads away, between the two fabric layers 1 14, 1 16 floating. This can be seen, for example, in the binding thread pair i3, i4, in which the binding thread i3 floats over the warp threads 20, 21, 23, 25, 26 of the first fabric layer 14. In the second fabric layer 16, six binding segments S ₂ are in each binding thread pair formed, which bind either over a warp thread or two warp threads.

FIG. 10b shows that here, too, the binding segments S _{2 of} the second fabric layer are arranged along binding segment diagonals D, D '.

FIG. 10c, in association with FIGS. 10a and 10b, shows the arrangement of the change points W or the changeover diagonals D _w , D _w '. In this embodiment too, the changeover diagonals D _w , D _w 'extend parallel to the binding segment diagonals D, D'. The Wechselstellendiagonalen D _w first type each include again provided without interruption of the regularity arrangement of change points W, which are separated in the binding thread longitudinal direction in each case by a transverse to the filament longitudinal direction extending yarn, in this case warp. In the changeover diagonals D _w 'of the second type, in each binding thread repeat in association with each such diagonal, there are respectively four change point offset positions V or correspondingly four offset change positions W _v . Again, the offset change points W _{v can be} regarded as defining an independent Wechselstellendiagonale the second type, in which the present in the change points D _{w of} the first kind regularity is interrupted by the absence of change points.

A variety of embodiments have been described above, in which in the run-side, first fabric layer 1 14 by providing a plain weave, this is also provided by the tied into the first fabric layer 1 14 binding threads or pairs of binder yarns, a very high regularity is provided while in the Although, in principle, the second fabric layer is also provided with a certain degree of regularity by arranging the binding segments S ₂ formed there along the binding segment diagonals. 1 to 14, with reference to FIGS. 1 to 14, in each case with reference to two basic binding weft threads 1 18, 120 for the two fabric layers 14, 16 or two binding threads i1, i2, other types of weave for the first fabric layer 11 are shown. Thus, it can be seen in FIG. 1 1 that there the basic weaving weft threads 1 18 of the first fabric layer 1 14 each float over four warp threads of the first fabric layer 14 on the outside thereof and then bind under a warp thread. So here's a 1 -4 binding in the first fabric layer. In a corresponding manner, the binding segments Si formed by the pairs of binder yarns of the first fabric layer 14 can each extend over a larger number of warp threads, in the example illustrated five warp threads. The binding segments S <S <immediately following one another in the weft direction, these each formed by the different binding threads of a respective pair of binder threads, adjoin one another directly, ie are not separated by a warp thread.

In the embodiment shown in FIG. 12, the floats of the basic binding weft threads 1 18 of the first fabric layer 14 extend over two warp threads in each case, so that a 1 -2 bond is present here. A corresponding pattern is also formed by the binding threads of the various binder thread pairs. Here, the binding segments Si of the first fabric layer 14 extend over a total of five warp threads, a float being present over the first and second or the fourth and fifth warp threads, while the binding thread runs under the middle of these five warp threads, that is to say on the inside thereof. Thus, each binding segment Si also forms the bond of the first fabric layer in connection with the fact that successive binding segments Si in the weft direction are each separated by a warp thread.

Figure 13, like Figure 1, also shows a 1 -4 weave in the first fabric layer, with the plain weave yarns 1 18 of the first fabric layer 14 floating on the outside of four warp yarns and then under a respective fifth warp yarn run through it. Here, the binding segments Si formed in the first fabric layer 11 are designed such that they extend over four warp threads in each case, that is to say a floating over four warp threads is present, while successive binding segments Si then pass through a warp thread are separated. Here too, therefore, the binding threads of a respective pair of binding threads continue to form the binding of the basic binding weft threads 1 18 of the first fabric layer. FIG. 14 combines a 1 -4 bond in the first fabric layer 1 14 with the existing there Grundbindungsschussfaden 1 18 with a corresponding binding of the binder thread pairs. The binding segments Si of the first fabric layer 14 each comprise five warp threads, wherein the binding threads involved in each case floats on the outside of two warp threads, then run under a warp thread and then floats again on the outside of two warp threads before a change to a binding segment occurs which is formed by the respective other binding thread of the same pair of binder threads. Since the binding segments Si again directly adjoin one another here, ie are not separated by a weft thread, a binding pattern is formed in which a floating over four warp threads is present, but this floating is formed by sections of two different binding threads.

In all of the exemplary embodiments illustrated in FIGS. 11 to 14, the binding segments S ₂ in the second fabric layer 16 are each formed with a single warp thread. The number of binding segments Si here corresponds to the number of binding segments S ₂ in a respective binder thread repeat, in particular here in the weft direction.

It can further be seen in FIGS. 11 to 14 that for the running side, that is to say the second fabric layer 116, a base weave is preferably selected in which the basic weaving weft threads 120 involved have comparatively long floats on the outside, so that here a comparatively plane interacts with the various guide or drive rollers interacting surface.

The embodiment according to the invention with the arrangement of existing in the running side fabric layer binding segments along respective Tie diagonal can of course also apply when the binding threads are formed extending in the warp direction. Furthermore, it is possible to provide binding yarns running both in the warp direction and in the weft direction, in which case the above-mentioned positioning of respective binding segments can be realized or superimposed on one another both for the binding threads extending in the warp direction and for the binding threads running in the weft direction. It should also be pointed out that, in the case of a fabric band for a machine for producing web material, the binding threads can be designed to extend in the machine direction, ie the band running direction, irrespective of whether they are weft threads or warp threads, or in the cross machine direction, ie transversely to the band running direction may be formed extending.

It is further contemplated that, although previously only embodiments with two layers of fabric have been described, the invention may also find application in fabric strips having more than two layers of fabric, for example, three layers of fabric. Thus, a third fabric layer can be arranged between the first fabric layer which provides the surface for receiving the web material to be produced and the second fabric fabric side which provides the reverse side for support on the various drive or deflection rollers. The binding threads which provide the cohesion of the various fabric layers can extend through all of these fabric layers, ie in turn form binding segments both in the first fabric layer and the second fabric layer and then also the third fabric layer. In principle, however, the binding segments forming binding threads in the second fabric layer which previously discussed in detail can also connect the second fabric layer directly to the third fabric layer. Furthermore, additional binding threads or pairs of binder threads may be provided, which realize a connection of the first fabric layer to the third fabric layer.

Claims

Fabric tape for a machine for producing web material, in particular paper or cardboard

claims

Fabric tape for a machine for the production of web material, in particular paper or cardboard, comprising a web material side first fabric layer (1 14) and a machine side second fabric layer (1 16), wherein the first fabric layer (1 14) and the second fabric layer (1 16) respective by having binding threads (i1 -i20) connected to one another in a binding thread direction, with respective base binding threads (1-50,1,118,120) extending in the binding thread direction and transverse to the binding thread direction, the binding threads (i1-i20) in the second fabric layer (1 16) form successive binding segments (S ₂ ) in the direction of the binding thread, in which the binding threads (i1 -i20) are bonded to at least one base binding thread of the second fabric layer (1 16) extending transversely to the binding thread direction, wherein in a binding thread direction and transversely to the binding thread direction extended binder thread repeat the Bindesegm formed in the second fabric layer (1 16) duck (S ₂ ) along at least one to the binding yarn direction and transverse to the binding yarn direction obliquely extending Bindesegmentdiagonale (D) are arranged.

Fabric tape according to claim 1,

characterized,

that adjacent binding threads (i1 -i20) form a binding thread pair. Fabric tape according to claim 2, characterized,

the binding threads (i1 -i20) of a pair of binder threads are immediately adjacent to one another.

Fabric tape according to claim 2,

characterized,

in that at least one base weave thread (120) of the second fabric layer (16) and / or at least one base weave thread of the first fabric layer extending in the binding thread direction is arranged between the binding threads (i1 -i20) of a binder thread pair.

Fabric tape according to one of claims 1 to 4,

characterized,

in that the binding threads (i1 -i20) in the first fabric layer (11) form successive binder segments (Si) in the binding thread direction, in which the binding threads (i1 -i20) are attached to at least one base binding thread (1, 3, 48) extending transversely to the binding thread direction , 50) of the first fabric layer (1 14) are set.

Fabric tape according to claim 2 and claim 5,

characterized,

in the first fabric layer (11), binding segments (S-i) of a binder thread (i1 -i20) of a binder thread pair and binder segments (S-i) of the other binder thread (i1 -i20) of the same binder thread pair follow one another alternately in the binder thread direction.

Fabric tape according to claim 2 and claim 5 or 6,

characterized,

that at changing points (W) the binding threads (i1 -i20) of a respective pair of binding threads intersect each other and one of the binding threads (i1 -i20) to Forming a binding segment (Si) in the first fabric layer (1 14) in this changes and

the change points (W) are arranged in a binder thread repeat along a plurality of changeover diagonals (D _w , D _w ').

8. fabric tape according to claim 7,

characterized,

the change-point diagonals (D _w , D _w ') run parallel to the binding-segment diagonals (D).

9. fabric tape according to claim 7,

characterized,

the change-point diagonals (D _w , D _w ') are angled relative to the binding-segment diagonal (D).

10. fabric tape according to any one of claims 7 to 9,

characterized,

the change-point diagonals (D _w , D _w ') have at least one change-point diagonal (D _w ) of a first type with interruption-free sequencing of change points (W) and at least one change-point diagonal (D _w ') of a second type interrupted by change-point offset points (V) Sequence of change points (W) include.

1 1. Fabric tape according to claim 10,

characterized,

the change-type diagonals (D _w ) of the first type and the change-point diagonals (D _w ) of the second type alternate with each other in a regular pattern.

12. fabric tape according to claim 10 or 1 1,

characterized, the change point offset points (V) are arranged in a regular pattern.

13. Fabric tape according to one of claims 5 to 12,

characterized,

an index ratio of binding segments (Si) in the first fabric layer (1 14) to bonding segments (S ₂ ) in the second fabric layer (1 16) is greater than 1. 14. Fabric tape according to one of claims 1 to 13,

characterized,

a number ratio of base binding threads (1, 3, 48, 50) extending transversely to the binding thread direction of the first fabric layer (1 14) and base bonding threads (2, 4, 47, 49) of the second fabric layer (1 16) is greater than 1.

15. Fabric tape according to one of claims 1 to 14,

characterized,

that in at least one binding segment diagonal (D) substantially all successive binding segments (S ₂ ) are binding segments (S ₂ ) of the same kind or / and formed by binding threads of the same type.

Fabric tape according to one of claims 1 to 15,

characterized,

binding segments (S ₂ ) of different types or / and binding segments formed by binding threads of different types follow one another in at least one binding segment diagonal (D).

17. fabric tape according to claim 16,

characterized,

binding segments (S ₂ ) of different types and / or binding threads contained in at least one binding segment diagonal (D) different binding segments alternate in a regular pattern.

18. fabric tape according to claim 1 to 17,

characterized,

that a plurality of binding segment diagonals (D, D ', D ", D'") having mutually different distribution and / or type of binding segments (S ₂ ) and / or binding segments formed by binding threads of different types and / or binding threads of different types are formed Tie segments are present.

19. A fabric tape according to claim 2 or any one of claims 3 to 18, when dependent on claim 2,

characterized,

in a binder thread repeat, the number of binder thread pairs with different courses of the binding threads (i1-i20) forming these is smaller than the number of binder thread pairs present in a binder thread repeat.

20. A fabric tape according to claim 2 or any one of claims 3 to 19, when dependent on claim 2,

characterized,

that the binding threads (i1 -i20) of a pair of binding threads in the first fabric layer (1 14) form an apparent ground weave thread of the first fabric layer (1 14) continuing the binding of the first fabric layer (1 14).

21. Fabric tape according to one of claims 1 to 20,

characterized,

a repeat length of the binding threads (i1 -i20) in the binding thread direction is greater than a repeat length of the plain weave of the first fabric layer (11) and / or the second fabric layer (116) in the binding thread direction.

22. Machine for producing web material, in particular paper or cardboard, comprising at least one fabric band according to one of the preceding claims.