WO2015091249A1

WO2015091249A1 - Fabric belt for a paper, cardboard, or tissue machine

Info

Publication number: WO2015091249A1
Application number: PCT/EP2014/077520
Authority: WO
Inventors: Juanhao ZOU; Scott D. Quigley
Original assignee: Voith Patent Gmbh
Priority date: 2013-12-17
Filing date: 2014-12-12
Publication date: 2015-06-25

Abstract

The invention relates to a fabric belt (100) which is suitable for use in a machine which produces and/or processes a fiber web, comprising warp threads, which are woven together with weft threads (A-I) whilst forming thread crossing points (KA-KI). Contact surfaces of the warp threads and contact surfaces of the weft threads are provided at at least some of the thread crossing points (KA-KI), the warp threads and weft threads being bonded together at said contact surfaces. At least some of the warp and/or weft threads have a flattened cross-sectional shape with a greater width than height at least at the thread crossing points (KA-KI) where the threads are bonded together, and the contact surface of each thread is provided by a thread outer face section which extends over the largest part of the width of the thread.

Description

The invention relates to a fabric tape which is suitable for use in a machine producing and / or processing a fibrous web, in particular a paper, board, tissue or nonwoven machine.

Tissue bands of the generic type include warp threads which are interwoven with weft threads to form crosshairs. Such fabric tapes may be woven and have an upper side and a lower side opposite thereto. When used as intended in the machine, the warp threads are in the MD direction and the cross threads in the CMD direction of the machine. Furthermore, the top to the fibrous web and the bottom to the machine. For use in a machine producing and / or processing a fibrous web, such originally fabricated fabric tapes are made endless at a fabric seam area, so that they can be operated in the machine as endless belts. Such a fabric seam area can be provided, for example, by longitudinal threads which are woven back in the region of their warp end sections in order to form seam loops. Such a fabric seam area may also be formed by, for example, warp thread end sections of warp yarns which are in each case paired in pairs and which are often interwoven with weft threads along a common weaving path with the formation of weft threads often forming part of the flat weave fabric portion. The seam tensile strength, in the fabric seam areas provided by seam loops as well as the fabric seam areas provided by the seam fabric, depends on the number of weft yarns interwoven with the warp end portions in weaving or the number of weft yarns with which the gathered warp end portions share a common weaving path are interwoven. The strength of the seam increases with increasing Number of weft threads with which the Kettfadenendabschnitte are interwoven. By weaving back or through the common web path, however, physical properties, such as, for example, permeability and thickness of the tissue band, are often influenced in the tissue suture region, so that these physical properties in the tissue suture region are locally different and different from the remaining part of the tissue band.

In order to achieve a high tensile strength on the one hand and no great change, for example, the permeability and / or thickness of the fabric tape on the other hand, it is proposed in the prior art to join the warp threads in the region of their Kettfadenendabschnitte cohesively at least some crosshairs with weft threads.

For example, it is known from US Pat. No. 5,062,480 to join the warp and weft threads cohesively at the crosshairs by the action of laser radiation by means of welding. Also, in order to increase the dimensional stability of such fabric tapes outside the fabric seam area, it is proposed, for example, in the prior art known from EP1749924, to join the warp and weft threads together at least in sections at the crosshairs.

However, it has now been shown that the cohesive connection -bspw. Schweißverbindung- the warp and weft threads at the crosshairs is often not sufficiently durable. As investigations of the applicant have shown, this problem can occur, for example, in woven tapes with open and / or single-ply weave structure.

It is therefore an object of the present invention to propose a fabric tape with improved cohesive connection of warp and weft threads at crosshairs.

The object is achieved by a fabric tape suitable for use in a machine producing and / or processing a fibrous web, with warp threads are interwoven with weft threads to form crosshairs and at least some of the crosshairs contact surfaces of the warp threads and contact surfaces of the weft yarn are provided at which the warp and weft threads are materially interconnected. The invention is characterized in that at least some of the warp and / or weft threads at least at the crosshairs at which they are materially interconnected, have a flattened cross-sectional shape with a greater width than height and the contact surface of the respective thread through one over the largest Part of the width of the thread extending portion of the outside of the thread is provided.

Investigations by the applicant have shown that a lack of contact between the warp threads and weft threads at the crosshairs in the production of the cohesive connection is often responsible for a lack of cohesive connection. By providing at least some warp and / or weft threads with a flattened cross-sectional shape which have a greater width than height and by their arrangement in the cohesive connection such that the contact surface by an over most of the width of the thread extending portion of the outside the yarn is provided, a significantly improved cohesive connection between the intersecting threads can be provided, which is significantly more tensile and durable than the known from the prior art cohesive connections with threads with circular cross-sectional area.

If the term thread is used in the context of the present invention, then it may be a warp thread or a weft thread. Advantageous embodiments and further developments of the invention are specified in the subclaims.

In order to improve the durability of all cohesive connections, a preferred embodiment of the invention provides that at all crosshairs at which the warp and weft threads are materially interconnected, at least one of the threads of warp and weft a flattened Has cross-sectional shape with a greater width than height and the contact surface is provided by the over most of the width of the respective thread extending outside.

Fabric tapes are made by a weaving process in which the weft yarn is woven back and forth substantially perpendicular to the warp yarns. For this purpose, the weft thread is withdrawn from a spool, whereby the weft thread can rotate about its own axis. Such twisting is not a problem when the weft thread is a weft yarn having a circular cross-sectional shape. However, this can lead to growing problems, the more the cross-sectional shape of the weft thread deviates from the circular shape. A particularly preferred embodiment of the invention therefore provides that at least some, in particular all of the crosshairs with weft threads materially connected warp threads have a flattened cross-sectional shape whose width to height ratio is greater than the ratio of width to height of the cross-sectional shape of at least some, in particular all of the weft threads materially connected to the warp threads. Preferably, all warp threads have a flattened cross-sectional shape with a greater width than height.

Preferably, the warp threads extend in their length substantially in the longitudinal direction of the fabric belt and the weft threads in their length substantially in the transverse direction of the fabric belt. By a substantial extent of the warp threads in the longitudinal direction of the fabric tape is to be understood that extend the longitudinal direction of the fabric tape and the longitudinal direction of the warp threads parallel to each other or with a maximum deviation of +/- 20 ° to each other. By a substantial extent of the weft threads in the transverse direction of the tissue band is to be understood that the transverse direction of the tissue band and the longitudinal direction of the transverse threads extend parallel to each other or with a maximum deviation of +/- 20 ° to each other.

The use of warp yarns having a flattened cross-sectional shape also has the advantage that such warp yarns at a height equal to the diameter of circular warp yarns can have a larger cross-sectional area and thus higher strength, in particular tensile strength. This is especially useful when the warp threads extend in their length in the longitudinal direction of the fabric band. Furthermore, warp threads with a flattened cross-sectional area, in particular for the use of the fabric tape as a TAD sieve, make sense, since they provide a larger contact surface to the fibrous web than threads having a circular cross-sectional shape and therefore no longer need to be ground flat, for example by a grinding process.

For a simple production of the fabric tape according to the invention, it is particularly useful if all the weft threads have a cross-sectional shape whose width to height ratio is smaller than the ratio of width to height of the flattened cross-sectional shape of the warp threads. It is conceivable in this context, in particular, that the warp threads have a rectangular or elliptical and / or the weft threads have a circular cross-sectional shape. The term rectangular cross-sectional shape also includes cross-sectional shapes, each with two mutually parallel sides and rounded corners. Preferably, the flattened cross-sectional shape of the at least some warp threads has a width to height ratio of 1, 15 or greater.

The fabric tape may have a top and a bottom opposite it. When using the fabric band in the machine as intended, the upper side can face the fibrous web, in particular be brought into contact with it, and the underside can face the machine, in particular be brought into contact with it.

The fabric tape may in this case have a weave pattern with floats of the warp threads and / or floats of the weft threads on the top and bottom.

In the case of floats of the warp yarns, the warp thread can at least one warp yarn alternately form alternating floats on the upper side and on the lower side in the weaving path, each floats of the warp yarn being formed on the upper side, while the warp yarn on the upper side is running one or more directly adjacent weft yarns and each floatation of the warp thread is formed on the underside by the warp thread on the underside continuously crosses one or more immediately adjacent weft threads and wherein between two immediately adjacent floats of the warp on the top of a floating of the warp thread on the bottom and vice versa is arranged.

In the case of floats of the weft yarns, the weft yarn may alternately form alternating floats on the upper side and on the underside in the weaving path of at least one weft thread, each floats of the weft yarn being formed on the upper side, while the weft yarn on the upper side is running one or more directly adjacent weft threads and each floatation of the weft thread is formed on the underside by the weft thread on the bottom continuously crossing one or more immediately adjacent weft threads and wherein between two immediately adjacent floats of the weft thread on the top of a floatation of the weft thread on the bottom and vice versa is arranged.

In this case, floats with different lengths may be formed in the weaving path of the at least one warp thread and / or the at least one weft thread. Concretely, in the weaving path of the at least one warp thread, a first floats having a first length and a second floats having a second length may be formed, wherein the first length is greater than the second length. Concretely, in the weaving path of the at least one weft thread, a first floating with a first length and a second floating with a second length may be formed, wherein the first length is greater than the second length.

Experiments by the Applicant have shown that with longer floats, the warp and / or weft threads arcuately over the crossing this thread runs as shorter floats and therefore longer floats often worse contact at the crosshairs between warp and weft prevails than at Compared to shorter floats. As a result, it can happen that the longer floats a less durable cohesive connection is achieved than with shorter floats. An advantageous embodiment of the invention provides that the at least one crosshair point at which a warp thread and a weft thread are integrally connected to one another in the weaving path of the at least one warp thread or in the Web path of the at least one weft thread is arranged in a float, which has a shorter length than other floats in the weaving path of this warp or weft thread. Concretely, the crosshair point can be arranged in the second floating of the at least one warp thread or weft thread. It is conceivable in this context, in particular, that the at least one crosshair point at which the warp and weft threads are integrally connected to one another is arranged in the shortest floatation of the weaving path of the at least one warp thread or weft thread.

By the above measure, thus, the durability of the cohesive connection is further increased. In this context, it is particularly useful if the floating with a shorter length extends over a maximum of four, in particular a maximum of two directly adjacent to each other threads. The length of a floatation of a thread is to be understood as the number of threads running transversely to the thread which this thread continuously crosses on the same side of the upper or lower side in direct succession.

The fabric tape according to the invention is preferably a fabric tape having a permeability in the range of 450 to 850 cfm, in particular 450 to 750 cfm and / or a thickness in the range of 0.7 to 1, 1 millimeter. Furthermore, the fabric tape is preferably a dryer fabric, in particular suitable for use in a drying device in which the wire is flowed through with hot air. Such a dryer fabric is commonly referred to as a "through air dryer" screen or TAD screen.

There are various ways for producing the cohesive connection conceivable. According to a particularly preferred embodiment of the invention, it is provided that the cohesive connection is effected by the action of radiant energy of a specific wavelength or a specific wavelength range, in particular by laser radiation energy. Such a way of producing a cohesive connection has the advantage that it can be acted upon very locally, without, for example, subjecting the entire fabric band to temperature. It is conceivable in this context in particular, that the wavelength or the wavelength range is in the infrared, in particular in the range of 700 nm to 1200 nm.

Specifically, it is conceivable that at least some cohesively connected threads before exposure to the radiation energy at the crosshairs between the threads, a material was introduced, which absorbs the radiation energy stronger than the material of the threads. Such an "absorber material" may, for example, be in liquid form and be sprayed between the parts to be joined, Such a liquid "absorber material" is sold, for example, under the name "Clearweld" from Gentex Corp. Alternatively, it is conceivable that the warp threads and / or the weft threads comprise a first type of thread and a second type of thread, wherein the first type of thread is made of a material which absorbs the radiant energy more strongly than the material of the second type of thread Thus, for example, the threads of the first type can be made of one Be material containing carbon black and / or color pigments and / or CNT (Carbon Nano Tubes).

It is conceivable in this context, in particular, that the weft threads which are connected at crosshairs cohesively with the warp threads are threads of the first type of thread. It is also conceivable that the warp threads and the remaining weft threads are threads of the second type of thread. According to a further preferred embodiment of the invention, it is provided that the fabric band is an endless fabric band, formed by a flat-woven full-tissue section, which is delimited in its longitudinal extent by a first and a second end-side section end and a tissue seam section. Here, the fabric tape is made endless by the two end-side section ends are brought together and connected to each other by weaving the Gewebahahtabschnitts. In this case, it is particularly useful for increasing the strength of the fabric seam section if at least some of the crosshairs at which the warp threads are materially connected to the weft threads are arranged in the fabric seam section. The solution according to the invention can furthermore be used with fabric tapes which have a "relatively open" weave structure. Accordingly, one embodiment of the invention can be a fabric tape having a thread density of a maximum of 60 warp threads per inch, in particular 30 to 60 warp threads per inch , preferably 40 to 55 warp threads per inch and / or a thread density of a maximum of 60 weft threads, in particular per inch 30 to 60 weft threads per inch, preferably 40 to 55 weft threads per inch Specifically, the full-weave section may be formed by the warp yarns and weft yarns interwoven therewith as full-cloth weft yarns, each warp yarn having two terminal warp end portions with a longitudinal end of the fabric belt over the first end-side portion e extending first Kettfadenendabschnitt and in the longitudinal direction of the fabric belt beyond the second end-side section end protruding second Kettfadenendabschnitt. In this case, the fabric tape can be made endless by integrating the first and second warp end portions and weaving them together with wefts designated as woven fabric wefts to form the fabric seam portion. In this case, the cohesively connected crosshairs can be those at which intersect Kettfadenendabschnitte and Woven warp wefts. It should also be noted in this connection that each first warp end section is closed by a first thread end and every other warp end section by a second thread end. Further, at least one of the Kettfadenendabschnitte when interweaving with the Woven fabric wefts follow a weaving path along which the Kettfadenendabschnitt towards its yarn end considered alternately alternately floats on the top and on the bottom, with one before the yarn end last floatation on one side of Top and bottom, wherein the Kettfadenendabschnitt following the last float before the thread end from one side of the top and bottom to the other side of the top and bottom changes. To further improve the cohesive Connection may be useful in this case, in particular, if the at least one Kettfadenendabschnitt is integrally connected to at least one crosshairs, which is arranged in a lying in the weaving path before the last floatation. As a result, the cohesive connection between the longitudinal thread end portion and at least one weave seam cross-thread is produced at a crosshair point at which the longitudinal thread end portion is still under sufficient tension to be reliably pressed against the woven fabric cross-thread during the production of the cohesive connection. The cohesive connection is thus durable and firm and the fabric tape of the invention has a seam with high strength. By providing a solid cohesive connection at the crosshairs, the number of cohesive joints can be significantly reduced, while maintaining or increasing resistance to fabric tapes with "non-selected" selection of cohesive joints in Gewebenahtabschnitt.

In this context, it is also conceivable that the weft threads arranged in the woven fabric section, which are connected in a material-locking manner to the warp threads at crosshairs, are threads of the first type of thread. In this case, it is conceivable, in particular, that the warp threads and the remaining weft threads are threads of the second type of thread.

It is also conceivable that the respective longitudinal thread end portion after this is guided after the last floating from one side to the other side, in particular woven with no further woven fabric cross-thread, this means that the longitudinal thread end portion before its thread end no longer from the other side to one side of the top and bottom is guided.

A first and a second thread are interwoven, in particular, when the first thread continuously crosses the second thread on one side and the first thread before and after the second thread respectively crosses at least one further thread on another side opposite to one side. Here are the two third threads not be arranged immediately adjacent to the second thread.

It is conceivable that in the endless making of the fabric band in each case a first and a second Langsfadenendabschnitte are paired together to form a so-called. Meeting place. In this case, the paired first and second warp end sections can each be the first and second warp end sections of one and the same longitudinal thread. It is also conceivable, however, for the paired first and second longitudinal thread end sections to be the first longitudinal thread section of a first longitudinal thread and the second longitudinal thread end section of a second longitudinal thread to be offset from the first longitudinal thread by a maximum of 20, in particular a maximum of 15 longitudinal thread.

In order to further increase the tensile strength of the seam, it is useful that the locations where the first and second warp end portions are mated in pairs are offset from one another as viewed in the longitudinal direction of the fabric tape for different pairs of merged first and second warp end portions. In this context, it is conceivable, in particular, that the woven-fabric weft threads with which the first warp-thread end sections are integrally connected are at least partially provided by different woven-seam weft threads for different first warp-thread end sections. It is also conceivable that the woven fabric weft threads are materially connected to those second Kettfadenendabschnitte are provided for different second Kettfadenendabschnitte at least partially by different Gewindestaht- weft threads. A further concrete development of the invention may provide that at least some of the paired first and second Kettfadenendabschnitte are woven together with one or more Gewindestaht weft threads. When paired first and second end warp ends are woven together with one or more plain weave wefts, the length of a match is determined by the number of warp wefts with which the joined Warp end sections are woven together. Where these are interwoven together, the weaving paths of the paired warp ends have, in particular, the same course.

It should be noted in this connection that the joint weaving preferably takes place with a maximum of ten woven-seam weft threads, preferably with a maximum of four plain-weave transverse threads.

Alternatively, it is conceivable that at least some of the paired first and second warp end sections are interwoven with no common woven seam weft, the last float in the weaving path of the first warp end section and the last float in the weaving path of the second longitudinal thread section either adjoining each other directly or a maximum of two immediately adjacent woven seam weft threads are spaced from each other. Immediately adjacent to each other means in this context that between the last two floats no woven seam transverse thread is arranged.

Also by this measure, a strong variation of the physical properties, such as the permeability or the flatness of the top and / or bottom, counteracted in Gewebenahtbereich, wherein it has been shown that a greater distance in the MD direction of the paired merged first and second longitudinal thread end portions other than those described above cause adverse weakening of the woven fabric seam, as well as often too large a permeability difference at that location from other fabric portions. When paired first and second longitudinal yarn end portions are not interwoven with any woven-fabric transverse yarns, the length of a meeting is determined by the number of woven-fabric transverse yarns disposed between the two ends of the weave paths of the two longitudinal yarn end portions being merged.

In order to increase the strength of the seam, it is useful that the locations where the first and second longitudinal thread end portions are joined in pairs for different pairs of merged first and second Longitudinal thread end portions viewed in the longitudinal direction of the tissue tape, offset from one another. In this context, it is conceivable, in particular, that the woven-fabric transverse yarns with which first longitudinal-thread end portions are integrally joined are provided at least partially by different woven-fabric transverse yarns for different first longitudinal yarn end portions. Likewise, it is conceivable that the woven fabric transverse threads are materially connected to those second longitudinal thread end sections, for different second longitudinal thread end sections at least partially provided by different woven fabric transverse threads. Concretely, the last floats in the web path respectively immediately adjacent first and second longitudinal thread end sections to at least one weave seam transverse thread, in particular at least one weave seam cross between them letting loose, be arranged offset to each other.

It is conceivable in this context, for example., That the last floats in the Web path each immediately adjacent first Längsfadenendabschnitte are offset by at least one longitudinal thread repeat to each other. Likewise, the last floats in the web path of immediately adjacent second longitudinal thread end sections can be arranged offset from each other by at least one longitudinal thread repeat. Preferably, in this connection, the woven-fabric transverse yarns to which a first pair of merged first and second longitudinal yarn end portions are interwoven together comprise a plurality of woven-fabric transverse yarns offset from the woven-fabric transverse yarns to which a pair of first and second longitudinal yarn end portions immediately adjacent to the first pair are common are interwoven. Are in this the cohesively to be connected fabric stitching transverse threads threads of the first kind, this creates the possibility that the first couple with the first pair of material-locking connection threads of the first kind are arranged spaced from the to the second pair a cohesive connection incoming threads of the first kind , As a result, the rigidity of the tissue band can be reduced in the longitudinal direction of the tissue band, since a cohesive Connection takes place in spaced apart in the longitudinal direction of the fabric strip streaked areas.

The invention will be further explained with reference to schematic drawings. 1 shows a photograph of a weaving path of two longitudinal thread end sections according to a first embodiment of the invention in the longitudinal direction of the longitudinal threads,

Figure 2 is a plan view of several crosshairs and a single warp yarn and Figure 3 is a comparison of the tensile strengths of cohesively connected warp yarns with circular and flattened cross-sectional area.

FIG. 1 shows a photograph of the weaving path of two longitudinal thread end sections 1, 2, which are brought together in pairs, according to a first embodiment of a fabric tape 100 according to the invention in the longitudinal direction of the longitudinal threads.

The fabric tape 100 has warp yarns providing longitudinal yarns-of which the longitudinal yarn end portions 1, 2 can be seen here- are interwoven with weft yarns A to I providing crosshairs KA through Kl, and a top 3 and a bottom side 4 opposite thereto Proper use of the tissue band in a paper, cardboard, tissue or non-woven machine, the longitudinal threads in the MD direction MD and the transverse threads in the CD direction CD of the machine extend.

The fabric tape 100 is formed here only by a system of longitudinal threads and only by a system of transverse threads. In the present case, the warp threads have a flattened cross-sectional shape with a greater width than height and the contact surface of the warp threads is by a provided over the greater part of the width of the warp thread extending portion of the outside of the warp thread.

In the present case, the warp threads have a rectangular or elliptical cross-sectional shape and the weft threads have a circular cross-sectional shape. The longitudinal threads have in their length considered two terminal Längsfadenendabschnitte, namely a first Längsfadenendabschnitt 1 and a second Längsfadenendabschnitt 2, each longitudinal thread end section 1, 2 in its length by a thread end 5, 6 is limited. In the present case, the first longitudinal thread end section 1 is delimited by the first thread end 5 and the second longitudinal thread end section is delimited by the second thread end 6.

The fabric tape 100 is an endless fabric tape formed by a flat woven solid fabric portion (not shown) and a partially illustrated fabric sewing portion 101. In this case, the full-tissue section is formed by the longitudinal threads and transverse threads which are interwoven as full-weave transverse threads and the full-tissue section is delimited in its longitudinal extent by a first and a second longitudinal section end, the first longitudinal thread end sections 1 projecting beyond the first longitudinal section end in the MD direction and the second longitudinal thread end sections 2 protrude beyond the second section end. In this case, the two longitudinal section ends are connected to one another by the fabric seam section. The woven fabric seam section 101 is formed by joining first and second longitudinal thread end sections and weaving them together with transverse threads designated as woven fabric transverse threads, wherein the two longitudinal thread end sections 1, 2 and the woven fabric transverse threads A to I can be seen here.

In the present case, the longitudinal threads and thus also the longitudinal thread end sections 1, 2 and the woven-thread transverse threads A, B, H and I shown in FIG. 1 are threads of the second type. The woven-thread transverse threads C to G are threads of the first type, ie these threads absorb radiation energy a certain wavelength stronger than the threads of the second kind. In the present case, the woven fabric transverse threads C to G are made of a PET and CNT (Carbon Nanotubes) containing mixture wherein the material of the threads of the second type contains no CNT.

As can be seen from the representation of FIG. 1, the two longitudinal thread end sections 1, 2 each follow the weave seam transverse threads A to I along a weaving path along which the respective longitudinal thread end section 1, 2 in the direction W1, W2 reaches its thread end 5, 6 considered several times alternately on the top 3 and the bottom 4 floats F1 1, F12, F21, F22 forms. It can be seen that each of the floats F1 1 to F22 is formed by the longitudinal thread end section 1, 2 on the same side of top 3 and bottom 4 continuously crossing one or more immediately adjacent woven fabric cross-threads. Concretely, the first longitudinal thread end section 1 forms the floatation F1 1, by continuously crossing on the underside 4 the two immediately adjacent woven fabric transverse threads G and H and the floatation F12 by continuously crossing the woven fabric thread F on the upper side 3. Furthermore, the second longitudinal thread end section 2 forms the floatation F21 by continuously crossing on the underside 4 the two immediately adjacent woven fabric transverse threads B and C and the floatation F22 by continuously crossing the woven fabric transverse thread E on the upper side 3.

The weaving path of the first longitudinal thread end section 1 in this case runs in the direction W1 to the first thread end 5, as the weaving path of the second longitudinal thread end section 2 extends in the direction W2 to the second thread end 6.

As can be seen, the first longitudinal thread end section 1 forms the last floats F12 in its weaving path in the direction W1 before the first thread end 5 and extends from the upper side 3 to the lower side 4 following the last floats F12 in front of the first thread end 5 the second longitudinal thread end section 2 forms the last floats F12 in its weaving path in the direction W2 in front of the second thread end 6 and follows the last floats F12 before the second thread end 5 from the top 3 to the bottom 4. Both longitudinal thread end sections 1, 2 interweave after the last floats F12, F22 with no further weave seam cross thread. According to the invention, the first longitudinal end section 1 at the crosshairs KG is materially connected to the fabric seam transverse thread G, wherein the crosshairs KG is disposed in the flotation F1 1 lying in the weaving path before the last floatation F12. In the present case, the floatation 11 is the floatation which immediately precedes the weaving path of the first longitudinal thread end section 1 of the last floatation 12, namely the penultimate floats 11 in the weaving path of the first longitudinal thread end section 1.

In addition, the first longitudinal thread end portion 1 is connected to the crosshairs KF and KE with the fabric seam transverse threads F and E cohesively, these compounds can often not be produced reproducibly well.

Furthermore, according to the invention, the second longitudinal thread end section 2 is connected in a material-bonded manner to the woven-seam transverse thread C at the crosshairing point KC, wherein the crosshairing point KC is arranged in the floatation F21 lying in the weaving path before the last floatation F22. In the present case, the floatation 21 is the floatation which immediately precedes the weaving path of the second longitudinal thread end section 2 of the last floatation 22, namely the second last floatation 21 in the weaving path of the second longitudinal thread end section 2.

In addition to this, the second longitudinal thread end section 2 at the cross hairs KD and KE is connected in a materially bonded manner to the fabric seam transverse threads D and E, wherein these connections can often not be produced in a reproducibly good manner.

This means that, in the weaving path of the two longitudinal thread end sections 1, 2, the respective longitudinal thread end section 1, 2 is connected in a material-locking manner to other woven-seam transverse threads F, E or D, E at crosshairs KF, KE, KD.

In the present case, the cohesive connection at the crosshairs KC to KG is a welded connection produced by the action of infrared radiation energy from the wavelength range 700 to 1200 nm. As can be seen from the illustration in FIG. 1, the two first and second longitudinal thread end sections 1, 2 merged in pairs are not interwoven with any weave seam A to I, in this case the last float F12 in the weaving path of the first longitudinal end section 1 and the last floatation F22 in the weaving path of the second longitudinal thread section 2 are spaced apart from each other by the weave seam transverse thread E.

FIG. 2a shows a plan view of several crosshairs between warp threads 10 and 20 and weft threads A and B, of which only the crosshairs FA1, FA2, FB1, FB2 are designated. It can be seen that the warp threads 10, 20 are threads of the second type and have a flattened cross-sectional shape, and that the weft threads A, B shown are threads of the first type and have a circular cross-sectional shape.

FIG. 2b shows a single warp thread 1 of FIG. 2a with a flattened cross-sectional shape, which was originally connected to a weft thread at a crosshair point after the cohesive connection has been released again. It can be seen that the flattened cross-sectional shape having a greater width than height and the contact surface of the warp, at which this was materially connected to the weft. The contact surface is provided by a portion of the outside of the thread extending over most of the width of the thread.

FIG. 3 shows a comparison of the tensile strengths of woven-seam samples of various warp threads having a circular and flattened cross-sectional area which are cohesively connected at crosshairs. The fabric seam samples have the same weave structure and the same weft threads and differ only in that the sample designated as "reference no welding" has no material connection at the crosshairs and the other samples are bonded together at the same crosshairs. For the sample labeled "Z4.1", the warp yarn has a flattened cross-sectional shape and for the samples labeled "0", "L4" or "L9", the warp yarns have a circular cross-sectional shape the fabric seam sample labeled "Z4.1" has significantly higher tensile strength than the other fabric seam samples.

Claims

claims

1 . Fabric tape suitable for use in a machine producing and / or processing a fibrous web, having warp threads interwoven with weft threads to form crosshairs, and at least some of the crosshairs provide contact surfaces of the warp threads and contact surfaces of the weft threads on which the warp and weft threads are provided are materially interconnected, characterized in that at least some of the warp and / or weft threads at least at the crosshairs where they are materially interconnected, have a flattened cross-sectional shape with a greater width than height and the contact surface of the respective thread through a most of the width of the thread extending portion of the outside of the thread is provided.

2. fabric tape according to claim 1, characterized in that at least some of the crosshairs with weft threads materially connected warp threads have a flattened cross-sectional shape whose width to height ratio is greater than the ratio of width to height of the cross-sectional shape of at least some of the warp threads materially associated weft threads.

3. fabric strip according to claim 1 or 2, characterized in that all the warp threads have a flattened cross-sectional shape with a greater width than height and / or that all weft threads have a cross-sectional shape whose width to height ratio is smaller than the ratio of width to height of flattened cross-sectional shape of the warp threads.

4. fabric tape according to one of the preceding claims, characterized in that the flattened cross-sectional shape of the at least some warp threads has a height to width ratio of 1, 15 or greater.

5. Fabric tape according to one of the preceding claims, characterized in that the warp threads have a rectangular or elliptical cross-sectional shape and / or that the weft threads have a circular cross-sectional shape.

6. fabric tape according to one of the preceding claims, characterized in that the fabric tape has a weave with floats of the warp threads and / or floats the weft yarns, wherein in the weaving path of at least one warp thread and / or at least one weft yarn floats are formed with different lengths and at least a crosshair point at which the warp and weft threads are cohesively connected, is arranged in the weaving path of a warp or weft thread in a float, which has a shorter length than other floats in the weaving path of this warp or weft thread.

7. fabric tape according to claim 6, characterized in that the at least one crosshair point at which the warp and weft threads are materially interconnected, is arranged in the shortest floatation of the weaving path.

8. fabric tape according to one of the preceding claims, characterized in that the cohesive connection by the action of radiation energy, in particular laser radiation energy, is effected.

9. fabric tape according to claim 8, characterized in that at least some cohesively connected threads before exposure to the radiation energy at the crosshairs between the threads, a material has been introduced, which absorbs the radiation energy stronger than the material of the threads.

10. fabric tape according to claim 9, characterized in that the

Warp threads and / or the weft threads comprise a first type of thread and a second type of thread, wherein the first type of thread is made of a material which absorbs the radiant energy more strongly than the material of the second type of thread.

1 1. Fabric tape according to one of the preceding claims 8 to 10, characterized in that the weft threads are connected at crosshairs cohesively with the warp threads, threads of the first type of thread and that in particular the warp threads and the remaining weft threads, threads of the second type of thread.

12. A fabric tape according to any one of the preceding claims, characterized in that the fabric tape is an endless fabric tape formed by a flat-woven full-width fabric section which is delimited in its longitudinal extent by a first and a second end-side section end and a fabric seam section, and

Fabric tape is made endless by the two end-side section ends are brought together and connected by weaving the Gewebahahtabschnitts.

13. Fabric tape according to one of the preceding claims, characterized in that at least some of the crosshairs at which the warp threads are integrally connected to the weft threads, are arranged in Gewebenahtabschnitt.

14. Fabric tape according to one of the preceding claims 12 and 13, characterized in that at least some of the crosshairs at which the threads are materially interconnected, in a in

Web path of a thread in the fabric seam section extending floating are arranged, which has a shorter length than another running in Gewebenahtabschnitt floating in the weaving path of the thread.

15. Fabric tape according to one of the preceding claims 12 to 14, characterized in that the solid fabric section is formed by the warp threads and with these interwoven weft yarns called full weft yarns, and each warp yarn has two terminal warp end portions, with a longitudinal direction of the fabric tape over the a first warp end section and a second warp end section projecting beyond the second end section end in the longitudinal direction of the fabric strip, the fabric strip being endless by merging the first and second warp end sections and interweaving them with weft threads designated as woven seam wefts to form the fabric seam section, and the materially connected

Crosshairs are those at which intersect kettfadenendabschnitte and tissue seam wefts.

16. fabric tape according to claim 15, characterized in that the

Fabric tape is made endless by the first and second longitudinal thread end portions are paired together to form each meeting.

17, fabric tape according to claim 16, characterized in that at least some of the meeting points of different paired first and second longitudinal Längsendendabschnitte viewed in the longitudinal direction of the fabric tape are arranged offset from one another.

18. Fabric tape according to one of the preceding claims 16 and 17, characterized in that at least some of the paired first and second longitudinal yarn end portions are woven together with one or more woven fabric weft yarns.

19. fabric tape according to one of the preceding claims 15 to 18, characterized in that the fabric tape has an upper side and a bottom opposite thereto, and that at least some of

Kettfadenendabschnitte when weaving with the woven fabric weft threads follow a weaving path along which the respective Kettfadenendabschnitt viewed towards its yarn end repeatedly alternately formed floats on the top and bottom, with one before the thread end last floats on one side of the top and bottom wherein the Kettfadenendabschnitt following the last floats before the thread end of the one side of top and bottom to the other side of top and bottom changes, each float is formed on the top by the Kettfadenendabschnitt on the top running one or several immediately adjacent woven seams

Weft threads crossed and each floatation is formed on the underside by the Kettfadenendabschnitt on the underside continuously crosses one or more immediately adjacent Gewindestaht weft threads and between two immediately adjacent floats on top of a floating on the bottom and vice versa is arranged, and wherein at least one

Kettfadenendabschnitt at least one crosshairs with a Gewindestaht weft thread is integrally connected, which is arranged in a lying in the web path before the last floatation.