CA2679296A1 - Press belt - Google Patents
Press belt Download PDFInfo
- Publication number
- CA2679296A1 CA2679296A1 CA002679296A CA2679296A CA2679296A1 CA 2679296 A1 CA2679296 A1 CA 2679296A1 CA 002679296 A CA002679296 A CA 002679296A CA 2679296 A CA2679296 A CA 2679296A CA 2679296 A1 CA2679296 A1 CA 2679296A1
- Authority
- CA
- Canada
- Prior art keywords
- belt
- endless belt
- longitudinal
- threads
- woven structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000004744 fabric Substances 0.000 claims abstract description 44
- 239000002657 fibrous material Substances 0.000 claims abstract description 31
- 238000009941 weaving Methods 0.000 claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000002861 polymer material Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/0027—Screen-cloths
- D21F1/0054—Seams thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0272—Wet presses in combination with suction or blowing devices
Landscapes
- Woven Fabrics (AREA)
- Paper (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Packaging Of Special Articles (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
- Package Frames And Binding Bands (AREA)
- Impression-Transfer Materials And Handling Thereof (AREA)
- Pens And Brushes (AREA)
Abstract
The invention relates to an endless belt (4) for a machine for the production of a fibrous material web, the belt being designed for an application where tensile stress of at least 30 kN/m is applied to the belt. It comprises a fabric formed by a flat woven structure and a connecting region. The flat woven structure comprises longitudinal threads extending in the MD direction (K2, K2,...) and first transverse threads extending in the CMD direction (S1, S2,...), the flat woven structure in the longitudinal extension thereof is delimited by a first end (23) on the longitudinal side and a second end (24) on the longitudinal side. Every longitudinal thread, viewed in the longitudinal extension, has a first thread end section (Kx.1), which protrudes beyond the first end of the woven structure on the longitudinal side in the MD direction, and a second thread end section (Kx.2), which protrudes beyond the second end of the woven structure on the longitudinal side in the MD direction. The two ends of the flat woven structure on longitudinal side are connected to each other by the connecting region (22), which is formed by weaving the first and second end sections of the longitudinal threads to the second transverse threads, thereby forming a plurality of pairs of a first and a second thread end section each, wherein the two thread end sections, viewed in the CMD direction, are disposed directly adjacent to each other and the two thread end sections, viewed in the MD direction, form a common overlapping region (ü1, ü2,...) in that the first end section of the pair is woven with the at least 15 consecutive second transverse threads, with which also the second end section of the pair is woven, and in that the two end sections of the pair follow the same weaving path in the overlapping region.
Description
c 1 Press belt The invention relates to an endless belt for a machine for the production of a fibrous material web, the belt being designed for an application where a tensile stress of at least 30 kN/m acts on the belt in the longitudinal extent of the latter.
The invention further relates to a pressing apparatus for a machine for the production of a fibrous material web, in which such an endless belt is used as a press belt.
In the recent past, a new pressing apparatus has been proposed in which an extended press nip is formed, in that a press belt that is under tension is led over an opposing surface. In this case, the opposing surface is generally formed by a section of the circumferential surface of a roll. The new pressing apparatus is distinguished in particular by the fact that the fibrous material web is dewatered in the direction of the opposing surface by means of the pressing force of the belt and the action of at least one fluid flowing in the direction from the press belt toward the opposing surface. By means of the extended press nip, in particular higher dryness values of the paper made in this way, in particular tissue paper, are achieved.
The press belts used are in particular permeable woven structures, which are woven flat and then subsequently made endless on the machine by means of a pintle seam connection. Since these press belts are subjected to tensile stresses of at least 30 kN/m but often between and 70 kN/m, this type of seam proves to be a weak 35 point, in particular with respect to its durability.
It is an object of the present invention to propose a belt that is woven flat but made endless and designed a 9 for use under a tensile stress of at least 30 kN/m, with an improved connection.
The invention is achieved by an endless belt for a machine for the production of a fibrous material web, the belt being designed for an application where a tensile stress of at least 30 kN/m acts thereon. The belt according to the invention comprises a fabric having a flat woven structure and having a connecting region, in which the flat woven structure comprises longitudinal threads extending in the MD direction and first transverse threads woven therewith and extending in the CMD direction, in which the flat woven structure is delimited in its longitudinal extent by a first end on the longitudinal side and a second end on the longitudinal side, in which each longitudinal thread, viewed in its longitudinal extent, has a first thread end section, which protrudes beyond the first end of the woven structure on the longitudinal side in the MD
direction, and a second thread end section, which protrudes beyond the second end of the woven structure on the longitudinal side in the MD direction, in which, in order to make the belt endless, the two ends on the longitudinal sides of the flat woven structure are connected to each other by the connecting region, which is formed by weaving the first and second end sections of the longitudinal threads with second transverse threads, thereby forming a large number of pairs of a first and a second thread end section in each case, in which the two thread end sections, viewed in the CMD
direction, are arranged directly beside each other, and in which the two thread end sections, viewed in the MD
direction, form a common overlapping region, in that the first end section of the pair is woven with the same at least 15 consecutive second transverse threads, with which also the second end section of the pair is woven, and in that the two end sections of the pair follow the same weaving path in the overlapping region.
The invention further relates to a pressing apparatus for a machine for the production of a fibrous material web, in which such an endless belt is used as a press belt.
In the recent past, a new pressing apparatus has been proposed in which an extended press nip is formed, in that a press belt that is under tension is led over an opposing surface. In this case, the opposing surface is generally formed by a section of the circumferential surface of a roll. The new pressing apparatus is distinguished in particular by the fact that the fibrous material web is dewatered in the direction of the opposing surface by means of the pressing force of the belt and the action of at least one fluid flowing in the direction from the press belt toward the opposing surface. By means of the extended press nip, in particular higher dryness values of the paper made in this way, in particular tissue paper, are achieved.
The press belts used are in particular permeable woven structures, which are woven flat and then subsequently made endless on the machine by means of a pintle seam connection. Since these press belts are subjected to tensile stresses of at least 30 kN/m but often between and 70 kN/m, this type of seam proves to be a weak 35 point, in particular with respect to its durability.
It is an object of the present invention to propose a belt that is woven flat but made endless and designed a 9 for use under a tensile stress of at least 30 kN/m, with an improved connection.
The invention is achieved by an endless belt for a machine for the production of a fibrous material web, the belt being designed for an application where a tensile stress of at least 30 kN/m acts thereon. The belt according to the invention comprises a fabric having a flat woven structure and having a connecting region, in which the flat woven structure comprises longitudinal threads extending in the MD direction and first transverse threads woven therewith and extending in the CMD direction, in which the flat woven structure is delimited in its longitudinal extent by a first end on the longitudinal side and a second end on the longitudinal side, in which each longitudinal thread, viewed in its longitudinal extent, has a first thread end section, which protrudes beyond the first end of the woven structure on the longitudinal side in the MD
direction, and a second thread end section, which protrudes beyond the second end of the woven structure on the longitudinal side in the MD direction, in which, in order to make the belt endless, the two ends on the longitudinal sides of the flat woven structure are connected to each other by the connecting region, which is formed by weaving the first and second end sections of the longitudinal threads with second transverse threads, thereby forming a large number of pairs of a first and a second thread end section in each case, in which the two thread end sections, viewed in the CMD
direction, are arranged directly beside each other, and in which the two thread end sections, viewed in the MD
direction, form a common overlapping region, in that the first end section of the pair is woven with the same at least 15 consecutive second transverse threads, with which also the second end section of the pair is woven, and in that the two end sections of the pair follow the same weaving path in the overlapping region.
The belt according to the invention comprises a fabric.
By means of interwoven longitudinal and transverse threads, a structure is provided which is capable of absorbing high tensile stresses. The connecting region in the belt according to the invention is designed in such a way that the thread end sections of the longitudinal threads extend into the connecting region in the MD direction and here are woven with further transverse threads in order to form the connecting region, the longitudinal thread sections, which point toward each other as the belt is made endless, forming pairs of first and second longitudinal thread end sections which, viewed in the CMD direction, are arranged directly beside one another and which, in each case viewed in the MD direction, overlap in a common section of at least 15 consecutive transverse threads and thereby weave the same weaving path.
As a result of the large overlapping region which the two longitudinal thread end sections that are directly adjacent to each other in the CMD direction have with each other in the MD direction, a secure connection is provided. Since the two longitudinal thread end sections of a pair weave the same weaving path with the consecutive transverse threads in the common overlapping region, there is the possibility of continuing the weaving pattern of the flat woven structure in the connecting region, which makes it possible to create a connecting region which has the same properties (e.g. permeability, open and closed structure) as the flat woven structure.
Advantageous refinements and developments of the invention are specified in the subclaims.
The belt according to the invention is generally produced in that the flat woven structure is produced first and this is then joined together by the woven connecting region to form an endless belt. The endless belt is then drawn into the machine.
Advantageously, as viewed in the MD direction, each overlapping region is terminated by the first and the second thread end section being led to an outer side of the fabric.
Trials carried out by the applicant have shown that, depending on the tensile stress occurring in the specific application, it may be expedient if the overlapping regions comprise up to 60 consecutive second transverse threads. For the application specified in the present case in a belt press under tensile stresses of 30 kN/m and more, trials have shown that it is sufficient if the overlapping regions comprise 18 to 25 consecutive second transverse threads.
Preferably, each overlapping region comprises the same number of second transverse threads.
Preferably, the first and the second transverse threads are identical with respect to their shape and nature and the material from which these are made.
In order to improve the durability of the seam further, it may be expedient if the connecting region, at least in some sections, is additionally reinforced with polymer material or adhesive, which has preferably been applied to the connecting region in the liquid state and produces an adhesive connection between the first and second thread end sections in their respective overlapping region. In this case, the polymer material or the adhesive can in particular have been applied in such a way that the permeability in this region is no lower than in regions without any adhesive applied as a liquid or polymer material applied as a liquid. This can be done, for example, by the adhesive or the polymer material which is deposited in the meshes of the fabric being blown away by means of compressed air.
Additionally or alternatively, the two thread end sections of a pair can be welded to each other, at least in some sections, in the overlapping region.
This can be brought about, for example, by means of ultrasonic welding.
In order to be able to make the entire connecting region longer in the MD direction without enlarging the individual overlapping regions thereby, a preferred refinement of the invention provides for the overlapping regions arranged beside one another in the CMD direction to be offset in relation to one another, as viewed in the MD direction. By means of the lengthened connecting region, improved durability of the connection is achieved. Furthermore, the lengthened achieves the situation where the overlapping regions are not all arranged along a single line extending in the CMD direction, by which means a potential tendency to marking of the belt at this point is prevented.
The relative offset in the MD direction of overlapping regions arranged directly beside one another in the CD
direction preferably comprises 20 to 60, preferably 30 to 40, consecutive second transverse threads.
In order to be able to make the endless belt according to the invention simply, provision is preferably made for a large number of consecutive overlapping regions each to have the same offset in relation to one another.
By means of interwoven longitudinal and transverse threads, a structure is provided which is capable of absorbing high tensile stresses. The connecting region in the belt according to the invention is designed in such a way that the thread end sections of the longitudinal threads extend into the connecting region in the MD direction and here are woven with further transverse threads in order to form the connecting region, the longitudinal thread sections, which point toward each other as the belt is made endless, forming pairs of first and second longitudinal thread end sections which, viewed in the CMD direction, are arranged directly beside one another and which, in each case viewed in the MD direction, overlap in a common section of at least 15 consecutive transverse threads and thereby weave the same weaving path.
As a result of the large overlapping region which the two longitudinal thread end sections that are directly adjacent to each other in the CMD direction have with each other in the MD direction, a secure connection is provided. Since the two longitudinal thread end sections of a pair weave the same weaving path with the consecutive transverse threads in the common overlapping region, there is the possibility of continuing the weaving pattern of the flat woven structure in the connecting region, which makes it possible to create a connecting region which has the same properties (e.g. permeability, open and closed structure) as the flat woven structure.
Advantageous refinements and developments of the invention are specified in the subclaims.
The belt according to the invention is generally produced in that the flat woven structure is produced first and this is then joined together by the woven connecting region to form an endless belt. The endless belt is then drawn into the machine.
Advantageously, as viewed in the MD direction, each overlapping region is terminated by the first and the second thread end section being led to an outer side of the fabric.
Trials carried out by the applicant have shown that, depending on the tensile stress occurring in the specific application, it may be expedient if the overlapping regions comprise up to 60 consecutive second transverse threads. For the application specified in the present case in a belt press under tensile stresses of 30 kN/m and more, trials have shown that it is sufficient if the overlapping regions comprise 18 to 25 consecutive second transverse threads.
Preferably, each overlapping region comprises the same number of second transverse threads.
Preferably, the first and the second transverse threads are identical with respect to their shape and nature and the material from which these are made.
In order to improve the durability of the seam further, it may be expedient if the connecting region, at least in some sections, is additionally reinforced with polymer material or adhesive, which has preferably been applied to the connecting region in the liquid state and produces an adhesive connection between the first and second thread end sections in their respective overlapping region. In this case, the polymer material or the adhesive can in particular have been applied in such a way that the permeability in this region is no lower than in regions without any adhesive applied as a liquid or polymer material applied as a liquid. This can be done, for example, by the adhesive or the polymer material which is deposited in the meshes of the fabric being blown away by means of compressed air.
Additionally or alternatively, the two thread end sections of a pair can be welded to each other, at least in some sections, in the overlapping region.
This can be brought about, for example, by means of ultrasonic welding.
In order to be able to make the entire connecting region longer in the MD direction without enlarging the individual overlapping regions thereby, a preferred refinement of the invention provides for the overlapping regions arranged beside one another in the CMD direction to be offset in relation to one another, as viewed in the MD direction. By means of the lengthened connecting region, improved durability of the connection is achieved. Furthermore, the lengthened achieves the situation where the overlapping regions are not all arranged along a single line extending in the CMD direction, by which means a potential tendency to marking of the belt at this point is prevented.
The relative offset in the MD direction of overlapping regions arranged directly beside one another in the CD
direction preferably comprises 20 to 60, preferably 30 to 40, consecutive second transverse threads.
In order to be able to make the endless belt according to the invention simply, provision is preferably made for a large number of consecutive overlapping regions each to have the same offset in relation to one another.
A further particularly preferred refinement of the invention provides for the flat woven structure and the connecting region to have the same weaving pattern. In this case, the weaving pattern of the flat woven structure is preferably continued by the weaving pattern of the connecting region without an offset between the two weaving patterns arising. This makes it possible to provide an endless belt which has the same properties over its entire length and over the connecting region. In this way, an endless belt is created in which the connecting region has the same properties as the flat woven structure.
The fabric of the belt according to the invention can be constructed both with one layer, that is to say with one longitudinal thread layer and one transverse thread layer in each case, and with two or more layers, that is to say with two or more longitudinal thread layers and/or transverse thread layers.
As is the case in all fabrics, the weaving pattern of the press belt is repeated in repeat units. For the application of the belt according to the invention as a press belt, a large number of types of weave are suitable. For example, a repeat unit can form either a plain weave or a 5-shaft satin weave.
Furthermore, the arrangement of the overlapping regions is repeated in repeats; in this case it is expedient if the repeat of the arrangement of the overlapping regions comprises more longitudinal threads and/or more transverse threads than the repeat of the flat woven structure.
In order to improve the connection of the end sections of the flat woven structure further, a development of the invention provides for the longitudinal extent of the connecting region, defined by the two overlapping regions which are furthest apart from each other, as viewed in the MD direction, to be between 5 cm and 100 cm, preferably between 10 cm and 70 cm, particularly preferably between 40 cm and 60 cm. This means that, according to this refinement, the entire connecting region can extend in the MD direction over a length in the range from 5 to 100 cm, preferably between 10 cm and 70 cm, particularly preferably between 40 cm and 60 cm.
One practical refinement of the invention provides for the endless belt to be formed only by the fabric.
If the belt according to the invention is used as a press belt in a belt press apparatus, then dewatering of the fibrous material web takes place in that the fibrous material web is dewatered simultaneously in the direction of the opposing surface by means of the pressing force of the belt and the action of at least one fluid flowing in the direction from the press belt toward the opposing surface. For the practical application of the belt according to the invention as a press belt, it is therefore expedient if the belt is permeable and preferably has a permeability between 100 cfm and 1200 cfm, preferably between 300 cfm and 800 cfm.
The belt is preferably designed for an application in which a tensile stress between 40 and 70 kN/m acts on the belt.
Furthermore, provision can be made for the longitudinal threads to be warp threads and for the transverse threads to be weft threads.
Furthermore, the invention relates to an improved pressing apparatus for a machine for the production of a fibrous material web, in which use is made of an _ g _ endless belt as described above as a press belt, the belt being under a tensile stress of at least 30 kN/m and, in order to provide an extended press nip, being led over an opposing surface which is preferably formed by a section of the circumferential surface of a roll, in particular a suction roll, the fibrous material web being led between the belt and the opposing surface and the belt exerting a pressing force on the fibrous material web on account of its tensile stress.
The tissue web is preferably led through the pressing apparatus according to the invention in a sandwich made of an upper permeable fabric and a lower permeable fabric, so that the result is the following structure:
1) press belt 2) upper permeable fabric 3) tissue web 4) lower permeable fabric 5) opposing surface.
In this case, the upper permeable fabric is preferably a three-dimensionally structured fabric, such as a TAD
fabric. Furthermore, the lower permeable fabric is preferably a press felt.
A pressing apparatus which is equipped with a belt according to the invention operates considerably more reliably, on account of the more stable design of the connecting region, than a pressing device which is equipped with a conventional press belt but which is otherwise identical.
_ 9 _ In order to be able to achieve both good dewatering of the tissue web by means of the mechanical tension of the belt according to the invention and also on account of a fluid flow through the belt, it is expedient for the belt according to the invention to have an open area of at least 25% and to have a contact area of at least 100 of its total area pointing toward the upper fabric.
The invention will be explained further by using the following schematic drawings, in which:
figure 1 shows a pressing apparatus which is equipped with a belt according to the invention as a press belt, figure 2 shows the course of the warp threads of a belt according to the invention in the connecting region and in the region of the flat woven structure, figure 3 shows the relative arrangement of the overlapping regions in relation to one another in a top view of the belt from figure 2, figure 4 shows, in a plan view of a section, the connecting region and the flat woven structure of the belt according to the invention from figures 2 and 3, figure 5 shows, in a plan view of a section, the connecting region and the flat woven structure of a further belt according to the invention.
Figure 1 shows a machirie 1 for the production of a fibrous material web 2, which is equipped with a pressing apparatus 3 having a belt 4 according to the invention as a press belt.
The fibrous material web 2, which is a tissue web in the present case, is formed in a forming section 5 of the machine 1 by a liquid fibrous material suspension being introduced into the inlet gap 6 between a conventional permeable and flat forming fabric 7 and a permeable and three-dimensionally structured fabric 8.
The structured fabric 8 here has a surface which touches the fibrous material web and which, as compared with the surface of the flat fabric 7 that touches the fibrous material web, has larger elevations and depressions.
After the fibrous material web 2 has run around a forming roll 9 in the sandwich between the forming fabric 7 and the structured fabric 8 for the purpose of dewatering, the forming fabric 7 is lifted off the fibrous material web 2, and the fibrous material web 2 is fed to the pressing apparatus 3 on the structured fabric 8.
In the pressing apparatus 3, the endless belt 4 according to the invention is used as a press belt.
The press belt 4 is under a tensile stress of at least kN/m in the pressing apparatus 3. In order to 25 provide an extended press nip, the press belt 4 is led over an opposing surface which, in the present case, is formed by a section of the circumferential surface of a suction roll 10 in the region of a suction zone Z. In order to dewater the tissue web 2 in the pressing 30 apparatus 3, the tissue web 2 is led in the sandwich between the permeable three-dimensionally structured fabric 8 and a permeable smooth belt 11 designed as a press felt. In this case, the press belt 4 makes contact with the structured fabric 8 and the press felt 11 is supported on the circumferential surface of the suction roll 10. In this case, because of its tensile stress, the press belt 4 exerts a pressing force on the sandwich comprising structured fabric 8, fibrous material web 2 and press felt 11.
Arranged above the press belt 4 there is also a blowing apparatus 16 which has the effect that a fluid flow of hot air and/or steam flows through the press belt 4, the structured fabric 8, the fibrous material web 2 and the press felt 11 to the suction zone Z. Consequently, in the pressing apparatus 3, the fibrous material web 2 is dewatered by the simultaneous action of the pressing force of the belt 4 on the fibrous material web 2 and the fluid flowing through the fibrous material web 2 in the direction from the press belt 4 toward the opposing surface.
After passing through the pressing apparatus 3, the press felt 11 is lifted off the fibrous material web 2 and the latter is fed on the structured fabric to a press nip 14 formed between a press roll 12 and a Yankee drying cylinder 13 for further dewatering.
After passing through the press nip 14, the fibrous material web 2 is lifted off the structured fabric 8 and led on the circumferential surface of the Yankee drying cylinder 13 in order subsequently to be lifted off the latter by means of a doctor device 15.
Figure 2 shows the courses of the warp threads of a repeat unit of the belt 4 according to the invention, which is used in the machine of figure 1. The belt 4 has the warp thread course illustrated both in the region of the flat woven structure and in the connecting region, the weaving pattern of the fabric continuing from the flat woven structure into the connecting region without any interruption or offset.
In the present case, a 5-shaft satin weave having the longitudinal threads Kl to K5 as warp threads is shown.
In the repeat, each warp thread Kl to K5, running on the underside US of the fabric, crosses four weft threads and, running on the top side OS of the fabric, crosses one weft thread. For example, the warp thread Kl running on the underside US crosses the four consecutive weft threads Sl to S4 before the former, running on the top side OS, crosses the weft thread S5.
In the present case, the weft threads are designated only in accordance with their position and not depending on whether they are first or second weft threads (the number before the designation indicates whether this is a first or second weft thread; the number after the designation indicates the position of the weft thread).
Table 1 shows the technical data of the belt according to the invention from figure 2.
Figure 3a shows the course of one of the warp threads Kl to K5 of the belt according to the invention from figure 2 in a section of the flat woven structure and in a section of the connecting region.
In the illustration of figure 3a, a section of the weaving path of one of the warp threads Kl to K5 can be seen as the latter weaves over a plurality of repeats in the manner described in figure 2. Since all the warp threads Kl to K5 have the same weaving paths, which differ only by means of a relative offset in the MD
direction in relation to one another, corresponding to the 5-shaft satin weave shown in figure 2, the following text can be applied as an example to all the weaving paths of the warp threads Kl to K5 of a warp repeat of the fabric. The exemplary warp thread is provided with the designation Kx, where x can be = l, 2, 3, 4, 5.
The pairs of parallel lines in figure 3a indicate an interruption to the representation of the weaving path of the warp thread Kx, which in reality continues.
The endless belt 4 is designed for an application in which a tensile stress of at least 30 kN/m acts on the belt. The endless belt 4 is formed only by a single-layer fabric 20. The fabric 20 is formed by a flat woven structure 21 and a connecting region 22.
The flat woven structure 21 is formed by the weaving of the warp threads Kl to K5 extending in the MD direction and the first transverse threads 1S woven therewith and extending in the CMD direction, the first transverse threads 1S being weft threads.
The flat woven structure 21 is delimited in its longitudinal extent by a first end on the longitudinal side and a second end on the longitudinal side. The two ends of the flat woven structure on the longitudinal side are not shown in the illustration of figure 3a for reasons of space but, for this purpose, are shown in the illustration of figure 4.
According to the invention, each longitudinal thread Kx, viewed in its longitudinal extent, has a first thread end section which protrudes beyond the first end of the woven structure on the longitudinal side in the MD direction, and a second thread end section which protrudes beyond the second end of the woven structure on the longitudinal side in the MD direction. In the illustration of figure 3a, the first thread end section of one of the warp threads K1 to K5 is provided with the designation Kx.l and the second thread end section of the same warp thread Kx is provided with the designation Kx.2.
According to the invention, the two ends of the flat woven structure on the longitudinal side are connected to each other by the connecting region 22 in order to make the belt endless, in that the first and the second end sections of the longitudinal threads Kl to K5 are woven with second transverse threads 2S, formed as weft threads, such that the weaving pattern of the flat woven structure 21 is continued by the weaving pattern of the connecting region 22 without any interruption.
Consequently, the flat woven structure 21 and the connecting region 22 have the same weaving pattern.
In the illustration of the weaving path of the warp thread Kx, it can be seen that the first thread end section Kx.1 of the warp thread Kx is woven with the second transverse threads 2S, and the second thread end section Kx.2 of the same warp thread Kx is woven with the second transverse threads 2S.
During the weaving of the thread end sections of the warp threads Kl to K5, the thread end sections form a large number of pairs each comprising a first and a second thread end section, in which the two thread end sections, viewed in the CMD direction, are arranged directly beside each other, and in which the two thread end sections, viewed in the MD direction, form a common overlapping region, in that the first end section of the pair is woven with the same at least 15 consecutive second transverse threads 2S, with which also the second end section of the pair is woven, and in that the two end sections of the pair follow the same weaving path in the overlapping region.
In the belt according to the invention from figure 3a, the first and the second thread end section Kx.1 and Kx.2 of the same longitudinal thread Kx always form a pair in which the two thread end sections Kx.1 and Kx.2, viewed in the CMD direction, are arranged directly beside each other, that is to say no thread end section of another warp thread is arranged between the thread end sections forming the pair. Furthermore, in the MD direction, the two thread end sections Kx.1 and Kx.2 of the same warp thread Kx form an overlapping region Uy, in that the first end section of the pair Kx.1 is woven with the same 18 consecutive second transverse threads 2S, with which also the second end section Kx.2 of the pair is woven, and in that the two end sections Kx.1 and Kx.2 of the pair follow the same weaving path in the overlapping region Uy.
From the illustration of figure 3a, it is also possible to see that each overlapping region Uy, viewed in the MD direction, is terminated in that the first thread end section Kx.1 and the second thread end section Kx.2 are led to an outer side of the fabric 20. The two ends of the overlapping region Uy are designated lEy and 2Ey in figure 3a.
Since the course of the warp thread Kx illustrated in figure 3a is representative of all the warp thread courses Kl to K5, each overlapping region Ul to 05 in the belt illustrated has the same number of second transverse threads.
Figure 3b shows the five overlapping regions Ul to 05 following one another in the CMD direction. The offset of mutually adjacent overlapping regions in the present case is respectively 40 second transverse threads 2S, the offset always being determined by the shortest distance of one end of an overlapping region from the end of the following overlapping region which is located closest to the first-named end. For instance, the offset between the two consecutive overlapping regions Ul and 02 is determined by the distance between the end 2E1 of the overlapping region IIl and the end 1E2 of the overlapping region 02. Furthermore, for instance, the offset between the two consecutive overlapping regions 02 and 03 is defined by the distance between the end 2E2 of the overlapping region 02 and the end 1E3 of the overlapping region 03. The principle is continued in the further overlapping regions.
Figure 4 shows, in a plan view of a section, the connecting region 22 and the flat woven structure 21 of the belt 4 according to the invention from figures 2 and 3.
The illustration of figure 4 shows the relative arrangement of the overlapping regions in relation to one another, in particular in the connecting region 22.
Furthermore, figure 4 shows an extract from the flat woven structure 21 and the two ends 23 and 24 delimiting the flat woven structure, which are connected to each other in the endless belt 4 by the connecting region 22. Figure 4 shows the belt 4 both only in a partial length and only in a partial width.
The illustrated extract from the connecting region shows three repeats Rl, R2, R3 arranged beside one another in the CMD direction from the arrangement of overlapping regions. Viewed in the MD direction, the connecting region extends over the length of a repeat.
Each repeat Rl, R2 and R3 of overlapping regions is formed by the overlapping regions Ul to 035.
Therefore, the repeat Rl, R2 and R3 of the arrangement of overlapping regions is greater than the repeat which forms the weaving pattern formed by the warp threads Kl to K5 and the weft threads Sl to S5 of the flat woven structure 21 and of the connecting region 22.
Overlapping regions Ul to 035 which, viewed in the CMD
direction, are arranged directly beside one another, are offset in relation to one another as viewed in the MD direction. Thus, for example, the two consecutive overlapping regions Ul and 02 are offset in relation to one other by 40 second transverse threads 2S, the offset always being determined by the shortest distance of one end of an overlapping region to the end of the following overlapping region which is located closest to the first-named end.
In the present case, at least some overlapping regions of a repeat which follow one another directly, as viewed in the CMD direction, in each case have the same offset in relation to one another. For instance, all of the overlapping regions Ul to 09 following one another in each case have the same offset in relation to one another in each case.
All of the overlapping regions lie on a family of straight lines parallel to one another, consecutive overlapping regions arranged on a straight line in each case always having the same offset in relation to one another and all the straight lines of the family being spaced apart equally from one another.
In the present case, the longitudinal extent of the connecting region, defined by the two overlapping regions 034 and 035 which, as viewed in the MD
direction, are spaced furthest apart from each other, is 60 cm.
The belt is permeable and in the present case has a permeability of 750 cfm.
Figure 5 shows a further embodiment of a belt 4 according to the invention. In the present case, the same features are provided with the same designations as in the preceding figures. The present belt 4, viewed in the MD direction, has in the connecting region 22 a section A in which all the overlapping regions Ua to Ue extend.
The fabric of the belt according to the invention can be constructed both with one layer, that is to say with one longitudinal thread layer and one transverse thread layer in each case, and with two or more layers, that is to say with two or more longitudinal thread layers and/or transverse thread layers.
As is the case in all fabrics, the weaving pattern of the press belt is repeated in repeat units. For the application of the belt according to the invention as a press belt, a large number of types of weave are suitable. For example, a repeat unit can form either a plain weave or a 5-shaft satin weave.
Furthermore, the arrangement of the overlapping regions is repeated in repeats; in this case it is expedient if the repeat of the arrangement of the overlapping regions comprises more longitudinal threads and/or more transverse threads than the repeat of the flat woven structure.
In order to improve the connection of the end sections of the flat woven structure further, a development of the invention provides for the longitudinal extent of the connecting region, defined by the two overlapping regions which are furthest apart from each other, as viewed in the MD direction, to be between 5 cm and 100 cm, preferably between 10 cm and 70 cm, particularly preferably between 40 cm and 60 cm. This means that, according to this refinement, the entire connecting region can extend in the MD direction over a length in the range from 5 to 100 cm, preferably between 10 cm and 70 cm, particularly preferably between 40 cm and 60 cm.
One practical refinement of the invention provides for the endless belt to be formed only by the fabric.
If the belt according to the invention is used as a press belt in a belt press apparatus, then dewatering of the fibrous material web takes place in that the fibrous material web is dewatered simultaneously in the direction of the opposing surface by means of the pressing force of the belt and the action of at least one fluid flowing in the direction from the press belt toward the opposing surface. For the practical application of the belt according to the invention as a press belt, it is therefore expedient if the belt is permeable and preferably has a permeability between 100 cfm and 1200 cfm, preferably between 300 cfm and 800 cfm.
The belt is preferably designed for an application in which a tensile stress between 40 and 70 kN/m acts on the belt.
Furthermore, provision can be made for the longitudinal threads to be warp threads and for the transverse threads to be weft threads.
Furthermore, the invention relates to an improved pressing apparatus for a machine for the production of a fibrous material web, in which use is made of an _ g _ endless belt as described above as a press belt, the belt being under a tensile stress of at least 30 kN/m and, in order to provide an extended press nip, being led over an opposing surface which is preferably formed by a section of the circumferential surface of a roll, in particular a suction roll, the fibrous material web being led between the belt and the opposing surface and the belt exerting a pressing force on the fibrous material web on account of its tensile stress.
The tissue web is preferably led through the pressing apparatus according to the invention in a sandwich made of an upper permeable fabric and a lower permeable fabric, so that the result is the following structure:
1) press belt 2) upper permeable fabric 3) tissue web 4) lower permeable fabric 5) opposing surface.
In this case, the upper permeable fabric is preferably a three-dimensionally structured fabric, such as a TAD
fabric. Furthermore, the lower permeable fabric is preferably a press felt.
A pressing apparatus which is equipped with a belt according to the invention operates considerably more reliably, on account of the more stable design of the connecting region, than a pressing device which is equipped with a conventional press belt but which is otherwise identical.
_ 9 _ In order to be able to achieve both good dewatering of the tissue web by means of the mechanical tension of the belt according to the invention and also on account of a fluid flow through the belt, it is expedient for the belt according to the invention to have an open area of at least 25% and to have a contact area of at least 100 of its total area pointing toward the upper fabric.
The invention will be explained further by using the following schematic drawings, in which:
figure 1 shows a pressing apparatus which is equipped with a belt according to the invention as a press belt, figure 2 shows the course of the warp threads of a belt according to the invention in the connecting region and in the region of the flat woven structure, figure 3 shows the relative arrangement of the overlapping regions in relation to one another in a top view of the belt from figure 2, figure 4 shows, in a plan view of a section, the connecting region and the flat woven structure of the belt according to the invention from figures 2 and 3, figure 5 shows, in a plan view of a section, the connecting region and the flat woven structure of a further belt according to the invention.
Figure 1 shows a machirie 1 for the production of a fibrous material web 2, which is equipped with a pressing apparatus 3 having a belt 4 according to the invention as a press belt.
The fibrous material web 2, which is a tissue web in the present case, is formed in a forming section 5 of the machine 1 by a liquid fibrous material suspension being introduced into the inlet gap 6 between a conventional permeable and flat forming fabric 7 and a permeable and three-dimensionally structured fabric 8.
The structured fabric 8 here has a surface which touches the fibrous material web and which, as compared with the surface of the flat fabric 7 that touches the fibrous material web, has larger elevations and depressions.
After the fibrous material web 2 has run around a forming roll 9 in the sandwich between the forming fabric 7 and the structured fabric 8 for the purpose of dewatering, the forming fabric 7 is lifted off the fibrous material web 2, and the fibrous material web 2 is fed to the pressing apparatus 3 on the structured fabric 8.
In the pressing apparatus 3, the endless belt 4 according to the invention is used as a press belt.
The press belt 4 is under a tensile stress of at least kN/m in the pressing apparatus 3. In order to 25 provide an extended press nip, the press belt 4 is led over an opposing surface which, in the present case, is formed by a section of the circumferential surface of a suction roll 10 in the region of a suction zone Z. In order to dewater the tissue web 2 in the pressing 30 apparatus 3, the tissue web 2 is led in the sandwich between the permeable three-dimensionally structured fabric 8 and a permeable smooth belt 11 designed as a press felt. In this case, the press belt 4 makes contact with the structured fabric 8 and the press felt 11 is supported on the circumferential surface of the suction roll 10. In this case, because of its tensile stress, the press belt 4 exerts a pressing force on the sandwich comprising structured fabric 8, fibrous material web 2 and press felt 11.
Arranged above the press belt 4 there is also a blowing apparatus 16 which has the effect that a fluid flow of hot air and/or steam flows through the press belt 4, the structured fabric 8, the fibrous material web 2 and the press felt 11 to the suction zone Z. Consequently, in the pressing apparatus 3, the fibrous material web 2 is dewatered by the simultaneous action of the pressing force of the belt 4 on the fibrous material web 2 and the fluid flowing through the fibrous material web 2 in the direction from the press belt 4 toward the opposing surface.
After passing through the pressing apparatus 3, the press felt 11 is lifted off the fibrous material web 2 and the latter is fed on the structured fabric to a press nip 14 formed between a press roll 12 and a Yankee drying cylinder 13 for further dewatering.
After passing through the press nip 14, the fibrous material web 2 is lifted off the structured fabric 8 and led on the circumferential surface of the Yankee drying cylinder 13 in order subsequently to be lifted off the latter by means of a doctor device 15.
Figure 2 shows the courses of the warp threads of a repeat unit of the belt 4 according to the invention, which is used in the machine of figure 1. The belt 4 has the warp thread course illustrated both in the region of the flat woven structure and in the connecting region, the weaving pattern of the fabric continuing from the flat woven structure into the connecting region without any interruption or offset.
In the present case, a 5-shaft satin weave having the longitudinal threads Kl to K5 as warp threads is shown.
In the repeat, each warp thread Kl to K5, running on the underside US of the fabric, crosses four weft threads and, running on the top side OS of the fabric, crosses one weft thread. For example, the warp thread Kl running on the underside US crosses the four consecutive weft threads Sl to S4 before the former, running on the top side OS, crosses the weft thread S5.
In the present case, the weft threads are designated only in accordance with their position and not depending on whether they are first or second weft threads (the number before the designation indicates whether this is a first or second weft thread; the number after the designation indicates the position of the weft thread).
Table 1 shows the technical data of the belt according to the invention from figure 2.
Figure 3a shows the course of one of the warp threads Kl to K5 of the belt according to the invention from figure 2 in a section of the flat woven structure and in a section of the connecting region.
In the illustration of figure 3a, a section of the weaving path of one of the warp threads Kl to K5 can be seen as the latter weaves over a plurality of repeats in the manner described in figure 2. Since all the warp threads Kl to K5 have the same weaving paths, which differ only by means of a relative offset in the MD
direction in relation to one another, corresponding to the 5-shaft satin weave shown in figure 2, the following text can be applied as an example to all the weaving paths of the warp threads Kl to K5 of a warp repeat of the fabric. The exemplary warp thread is provided with the designation Kx, where x can be = l, 2, 3, 4, 5.
The pairs of parallel lines in figure 3a indicate an interruption to the representation of the weaving path of the warp thread Kx, which in reality continues.
The endless belt 4 is designed for an application in which a tensile stress of at least 30 kN/m acts on the belt. The endless belt 4 is formed only by a single-layer fabric 20. The fabric 20 is formed by a flat woven structure 21 and a connecting region 22.
The flat woven structure 21 is formed by the weaving of the warp threads Kl to K5 extending in the MD direction and the first transverse threads 1S woven therewith and extending in the CMD direction, the first transverse threads 1S being weft threads.
The flat woven structure 21 is delimited in its longitudinal extent by a first end on the longitudinal side and a second end on the longitudinal side. The two ends of the flat woven structure on the longitudinal side are not shown in the illustration of figure 3a for reasons of space but, for this purpose, are shown in the illustration of figure 4.
According to the invention, each longitudinal thread Kx, viewed in its longitudinal extent, has a first thread end section which protrudes beyond the first end of the woven structure on the longitudinal side in the MD direction, and a second thread end section which protrudes beyond the second end of the woven structure on the longitudinal side in the MD direction. In the illustration of figure 3a, the first thread end section of one of the warp threads K1 to K5 is provided with the designation Kx.l and the second thread end section of the same warp thread Kx is provided with the designation Kx.2.
According to the invention, the two ends of the flat woven structure on the longitudinal side are connected to each other by the connecting region 22 in order to make the belt endless, in that the first and the second end sections of the longitudinal threads Kl to K5 are woven with second transverse threads 2S, formed as weft threads, such that the weaving pattern of the flat woven structure 21 is continued by the weaving pattern of the connecting region 22 without any interruption.
Consequently, the flat woven structure 21 and the connecting region 22 have the same weaving pattern.
In the illustration of the weaving path of the warp thread Kx, it can be seen that the first thread end section Kx.1 of the warp thread Kx is woven with the second transverse threads 2S, and the second thread end section Kx.2 of the same warp thread Kx is woven with the second transverse threads 2S.
During the weaving of the thread end sections of the warp threads Kl to K5, the thread end sections form a large number of pairs each comprising a first and a second thread end section, in which the two thread end sections, viewed in the CMD direction, are arranged directly beside each other, and in which the two thread end sections, viewed in the MD direction, form a common overlapping region, in that the first end section of the pair is woven with the same at least 15 consecutive second transverse threads 2S, with which also the second end section of the pair is woven, and in that the two end sections of the pair follow the same weaving path in the overlapping region.
In the belt according to the invention from figure 3a, the first and the second thread end section Kx.1 and Kx.2 of the same longitudinal thread Kx always form a pair in which the two thread end sections Kx.1 and Kx.2, viewed in the CMD direction, are arranged directly beside each other, that is to say no thread end section of another warp thread is arranged between the thread end sections forming the pair. Furthermore, in the MD direction, the two thread end sections Kx.1 and Kx.2 of the same warp thread Kx form an overlapping region Uy, in that the first end section of the pair Kx.1 is woven with the same 18 consecutive second transverse threads 2S, with which also the second end section Kx.2 of the pair is woven, and in that the two end sections Kx.1 and Kx.2 of the pair follow the same weaving path in the overlapping region Uy.
From the illustration of figure 3a, it is also possible to see that each overlapping region Uy, viewed in the MD direction, is terminated in that the first thread end section Kx.1 and the second thread end section Kx.2 are led to an outer side of the fabric 20. The two ends of the overlapping region Uy are designated lEy and 2Ey in figure 3a.
Since the course of the warp thread Kx illustrated in figure 3a is representative of all the warp thread courses Kl to K5, each overlapping region Ul to 05 in the belt illustrated has the same number of second transverse threads.
Figure 3b shows the five overlapping regions Ul to 05 following one another in the CMD direction. The offset of mutually adjacent overlapping regions in the present case is respectively 40 second transverse threads 2S, the offset always being determined by the shortest distance of one end of an overlapping region from the end of the following overlapping region which is located closest to the first-named end. For instance, the offset between the two consecutive overlapping regions Ul and 02 is determined by the distance between the end 2E1 of the overlapping region IIl and the end 1E2 of the overlapping region 02. Furthermore, for instance, the offset between the two consecutive overlapping regions 02 and 03 is defined by the distance between the end 2E2 of the overlapping region 02 and the end 1E3 of the overlapping region 03. The principle is continued in the further overlapping regions.
Figure 4 shows, in a plan view of a section, the connecting region 22 and the flat woven structure 21 of the belt 4 according to the invention from figures 2 and 3.
The illustration of figure 4 shows the relative arrangement of the overlapping regions in relation to one another, in particular in the connecting region 22.
Furthermore, figure 4 shows an extract from the flat woven structure 21 and the two ends 23 and 24 delimiting the flat woven structure, which are connected to each other in the endless belt 4 by the connecting region 22. Figure 4 shows the belt 4 both only in a partial length and only in a partial width.
The illustrated extract from the connecting region shows three repeats Rl, R2, R3 arranged beside one another in the CMD direction from the arrangement of overlapping regions. Viewed in the MD direction, the connecting region extends over the length of a repeat.
Each repeat Rl, R2 and R3 of overlapping regions is formed by the overlapping regions Ul to 035.
Therefore, the repeat Rl, R2 and R3 of the arrangement of overlapping regions is greater than the repeat which forms the weaving pattern formed by the warp threads Kl to K5 and the weft threads Sl to S5 of the flat woven structure 21 and of the connecting region 22.
Overlapping regions Ul to 035 which, viewed in the CMD
direction, are arranged directly beside one another, are offset in relation to one another as viewed in the MD direction. Thus, for example, the two consecutive overlapping regions Ul and 02 are offset in relation to one other by 40 second transverse threads 2S, the offset always being determined by the shortest distance of one end of an overlapping region to the end of the following overlapping region which is located closest to the first-named end.
In the present case, at least some overlapping regions of a repeat which follow one another directly, as viewed in the CMD direction, in each case have the same offset in relation to one another. For instance, all of the overlapping regions Ul to 09 following one another in each case have the same offset in relation to one another in each case.
All of the overlapping regions lie on a family of straight lines parallel to one another, consecutive overlapping regions arranged on a straight line in each case always having the same offset in relation to one another and all the straight lines of the family being spaced apart equally from one another.
In the present case, the longitudinal extent of the connecting region, defined by the two overlapping regions 034 and 035 which, as viewed in the MD
direction, are spaced furthest apart from each other, is 60 cm.
The belt is permeable and in the present case has a permeability of 750 cfm.
Figure 5 shows a further embodiment of a belt 4 according to the invention. In the present case, the same features are provided with the same designations as in the preceding figures. The present belt 4, viewed in the MD direction, has in the connecting region 22 a section A in which all the overlapping regions Ua to Ue extend.
Claims (21)
1. An endless belt for a machine for the production of a fibrous material web, the belt being designed for an application where a tensile stress of at least 30 kN/m acts on the belt, comprising a fabric formed by a flat woven structure and a connecting region:
- the flat woven structure comprising longitudinal threads extending in the MD direction and first transverse threads woven therewith and extending in the CMD direction, - the flat woven structure being delimited in its longitudinal extent by a first end on the longitudinal side and a second end on the longitudinal side, - each longitudinal thread, viewed in its longitudinal extent, having a first thread end section, which protrudes beyond the first end of the woven structure on the longitudinal side in the MD direction, and a second thread end section, which protrudes beyond the second end of the woven structure on the longitudinal side in the MD
direction, - the two ends on the longitudinal sides of the flat woven structure being connected to each other by the connecting region, which is formed by weaving the first and second end sections of the longitudinal threads with second transverse threads, and thereby - forming a large number of pairs of a first and a second thread end section in each case, in which the two thread end sections, viewed in the CMD
direction, are arranged directly beside each other, and in which the two thread end sections, viewed in the MD direction, form a common overlapping region, in that the first end section of the pair is woven with the same at least 15 consecutive second transverse threads, with which also the second end section of the pair is woven, and in that the two end sections of the pair follow the same weaving path in the overlapping region.
- the flat woven structure comprising longitudinal threads extending in the MD direction and first transverse threads woven therewith and extending in the CMD direction, - the flat woven structure being delimited in its longitudinal extent by a first end on the longitudinal side and a second end on the longitudinal side, - each longitudinal thread, viewed in its longitudinal extent, having a first thread end section, which protrudes beyond the first end of the woven structure on the longitudinal side in the MD direction, and a second thread end section, which protrudes beyond the second end of the woven structure on the longitudinal side in the MD
direction, - the two ends on the longitudinal sides of the flat woven structure being connected to each other by the connecting region, which is formed by weaving the first and second end sections of the longitudinal threads with second transverse threads, and thereby - forming a large number of pairs of a first and a second thread end section in each case, in which the two thread end sections, viewed in the CMD
direction, are arranged directly beside each other, and in which the two thread end sections, viewed in the MD direction, form a common overlapping region, in that the first end section of the pair is woven with the same at least 15 consecutive second transverse threads, with which also the second end section of the pair is woven, and in that the two end sections of the pair follow the same weaving path in the overlapping region.
2. The endless belt as claimed in claim 1, characterized in that, as viewed in the MD direction, each overlapping region is terminated by the first and the second thread end section being led to an outer side of the fabric.
3. The endless belt as claimed in claim 1 or 2, characterized in that the overlapping regions comprise up to 60 consecutive second transverse threads, preferably 18 to 25 consecutive second transverse threads.
4. The endless belt as claimed in one of the preceding claims, characterized in that each overlapping region comprises the same number of second transverse threads.
5. The endless belt as claimed in one of the preceding claims, characterized in that the first and the second thread end section of the same longitudinal thread always form a pair.
6. The endless belt as claimed in one of the preceding claims, characterized in that, viewed in the MD direction, the connecting region has a section in which all the overlapping regions extend.
7. The endless belt as claimed in one of the preceding claims, characterized in that the overlapping regions following one another in the CMD direction, viewed in the MD direction, are offset in relation to one another.
8. The endless belt as claimed in one of the preceding claims, characterized in that the offset of at least some consecutive overlapping regions comprises 20 to 60, preferably 30 to 40, consecutive second transverse threads.
9. The endless belt as claimed in either of claims 7 and 8, characterized in that a large number of consecutive overlapping regions each have the same offset in relation to one another.
10. The endless belt as claimed in one of the preceding claims, characterized in that the flat woven structure and the connecting region have the same weaving pattern.
11. The endless belt as claimed in one of the preceding claims, characterized in that the fabric has one layer or more layers.
12. The endless belt as claimed in one of the preceding claims, characterized in that the weaving pattern of the flat woven structure is repeated in repeats, a repeat preferably forming either a plain weave or a 5-shaft satin weave.
13. The endless belt as claimed in claim 12, characterized in that the arrangement of the overlapping regions is repeated in repeats, a repeat of the arrangement of the overlapping regions comprising more longitudinal threads and/or more transverse threads than a repeat of the flat woven structure.
14. The endless belt as claimed in one of the preceding claims, characterized in that the longitudinal extent of the connecting region, defined by the two overlapping regions which are furthest apart from each other, as viewed in the MD direction, is between 5 cm and 100 cm, preferably between 10 cm and 70 cm, particularly preferably between 40 cm and 60 cm.
15. The endless belt as claimed in one of the preceding claims, characterized in that the belt is formed only by the fabric.
16. The endless belt as claimed in one of the preceding claims, characterized in that the belt is permeable and preferably has a permeability between 100 cfm and 1200 cfm, preferably between 300 cfm and 800 cfm.
17. The endless belt as claimed in one of the preceding claims, characterized in that the belt is designed for an application in which a tensile stress between 40 and 70 kN/m acts on the belt.
18. The endless belt as claimed in one of the preceding claims, characterized in that the longitudinal threads are warp threads and the transverse threads are weft threads.
19. A pressing apparatus for a machine for the production of a fibrous material web, in which use is made of an endless belt as claimed in one of claims 1 to 14 as a press belt which is under a tensile stress of at least 30 kN/m and, in order to provide an extended press nip, is led over an opposing surface which is preferably formed by a section of the circumferential surface of a roll, in particular a suction roll, the fibrous material web being led between the belt and the opposing surface and the belt exerting a pressing force on the fibrous material web on account of its tensile stress.
20. The pressing apparatus as claimed in claim 19, characterized in that the fibrous material web is led in the sandwich between a permeable three-dimensionally structured fabric and a permeable smooth belt, in particular a press felt, the press belt making contact with the structured fabric and the smooth belt making contact with the opposing surface.
21. The pressing apparatus as claimed in claim 19 or 20, characterized in that the fibrous material web is dewatered in the direction of the opposing surface by means of the pressing force of the belt and the action of at least one fluid flowing in the direction from the press belt toward the opposing surface.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007008500.3 | 2007-02-21 | ||
| DE102007008500A DE102007008500A1 (en) | 2007-02-21 | 2007-02-21 | press belt |
| PCT/EP2008/051821 WO2008101865A1 (en) | 2007-02-21 | 2008-02-15 | Press belt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2679296A1 true CA2679296A1 (en) | 2008-08-28 |
Family
ID=39415119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002679296A Abandoned CA2679296A1 (en) | 2007-02-21 | 2008-02-15 | Press belt |
Country Status (14)
| Country | Link |
|---|---|
| US (1) | US20100032120A1 (en) |
| EP (1) | EP2129829B1 (en) |
| JP (1) | JP2010519420A (en) |
| KR (1) | KR20090125106A (en) |
| CN (1) | CN101680177A (en) |
| AT (1) | ATE477369T1 (en) |
| BR (1) | BRPI0807307A2 (en) |
| CA (1) | CA2679296A1 (en) |
| DE (2) | DE102007008500A1 (en) |
| ES (1) | ES2348063T3 (en) |
| MX (1) | MX2009008917A (en) |
| PL (1) | PL2129829T3 (en) |
| RU (1) | RU2009134276A (en) |
| WO (1) | WO2008101865A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007042201A1 (en) * | 2007-09-05 | 2009-03-19 | Voith Patent Gmbh | Belt for a machine for producing web material, in particular paper or cardboard |
| DE102010026609B3 (en) * | 2010-07-09 | 2011-11-17 | Lindauer Dornier Gesellschaft Mit Beschränkter Haftung | Method and apparatus for weaving patterns on fabrics with added weft effects |
| DE102010034969B3 (en) | 2010-08-20 | 2011-11-03 | Lindauer Dornier Gesellschaft Mit Beschränkter Haftung | Weaving and weaving machine for weaving patterns in fabrics with additional pattern effects |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US926004A (en) * | 1908-01-06 | 1909-06-22 | Wilhelm Keller | Method of joining or connecting fabrics. |
| DE901256C (en) * | 1941-02-09 | 1954-01-07 | Antonius Kufferath | Method for producing a woven seam for making metal cloths endless, in particular for paper machines |
| DE2902880C2 (en) * | 1979-01-25 | 1985-10-03 | Hermann Wangner Gmbh & Co Kg, 7410 Reutlingen | Process for making a multilayer dewatering screen endless and dewatering screen produced according to this process |
| JPS617120A (en) * | 1984-06-19 | 1986-01-13 | Yamauchi Rubber Ind Co Ltd | Endless belt for enp |
| US5196092A (en) * | 1991-09-25 | 1993-03-23 | Albany International Corp. | Reinforcement of coated surfaces of lnp belts |
| US7005038B2 (en) * | 2001-10-05 | 2006-02-28 | National Wire Fabric, Inc. | Belt-machine combination |
| FI113674B (en) * | 2002-12-18 | 2004-05-31 | Tamfelt Oyj Abp | Press felt |
| EP1709242A2 (en) * | 2004-01-30 | 2006-10-11 | Voith Patent GmbH | Advanced dewatering system |
| RU2338098C2 (en) * | 2004-01-30 | 2008-11-10 | Фойт Пэйпер Патент Гмбх | Pressing part and permeable tape in paper-making machine |
| JP4403058B2 (en) * | 2004-11-30 | 2010-01-20 | 日本フイルコン株式会社 | Method for weaving industrial fabric and endless industrial fabric weaved thereby |
| JP4394563B2 (en) * | 2004-11-30 | 2010-01-06 | 日本フイルコン株式会社 | Method for weaving industrial fabric and endless industrial fabric weaved thereby |
| DE102006042812A1 (en) * | 2006-09-08 | 2008-03-27 | Voith Patent Gmbh | Belt for a machine for producing web material, in particular paper, cardboard or tissue, and method for producing such a belt |
-
2007
- 2007-02-21 DE DE102007008500A patent/DE102007008500A1/en not_active Withdrawn
-
2008
- 2008-02-15 ES ES08709011T patent/ES2348063T3/en active Active
- 2008-02-15 WO PCT/EP2008/051821 patent/WO2008101865A1/en active Application Filing
- 2008-02-15 CN CN200880012426A patent/CN101680177A/en active Pending
- 2008-02-15 CA CA002679296A patent/CA2679296A1/en not_active Abandoned
- 2008-02-15 AT AT08709011T patent/ATE477369T1/en active
- 2008-02-15 BR BRPI0807307-4A2A patent/BRPI0807307A2/en not_active IP Right Cessation
- 2008-02-15 KR KR1020097019466A patent/KR20090125106A/en not_active Application Discontinuation
- 2008-02-15 DE DE502008001124T patent/DE502008001124D1/en active Active
- 2008-02-15 EP EP08709011A patent/EP2129829B1/en not_active Not-in-force
- 2008-02-15 MX MX2009008917A patent/MX2009008917A/en unknown
- 2008-02-15 PL PL08709011T patent/PL2129829T3/en unknown
- 2008-02-15 RU RU2009134276/12A patent/RU2009134276A/en not_active Application Discontinuation
- 2008-02-15 JP JP2009550263A patent/JP2010519420A/en active Pending
-
2009
- 2009-08-20 US US12/544,757 patent/US20100032120A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE502008001124D1 (en) | 2010-09-23 |
| RU2009134276A (en) | 2011-03-27 |
| BRPI0807307A2 (en) | 2014-05-06 |
| PL2129829T3 (en) | 2011-02-28 |
| ATE477369T1 (en) | 2010-08-15 |
| US20100032120A1 (en) | 2010-02-11 |
| KR20090125106A (en) | 2009-12-03 |
| DE102007008500A1 (en) | 2008-08-28 |
| WO2008101865A1 (en) | 2008-08-28 |
| EP2129829A1 (en) | 2009-12-09 |
| ES2348063T3 (en) | 2010-11-29 |
| CN101680177A (en) | 2010-03-24 |
| MX2009008917A (en) | 2010-03-15 |
| JP2010519420A (en) | 2010-06-03 |
| EP2129829B1 (en) | 2010-08-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |
Effective date: 20140217 |