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

Definitions

• the invention relates to an endless belt for a machine for producing a fibrous web, which is designed for an application in which acts on the band acting in the longitudinal direction of the strip tensile stress of at least 30kN / m.
• the invention further relates to a press device of a machine for producing a fibrous web, in which such an endless belt is used as a press belt.
• an extended press nip is formed by passing a tensioned press belt over a mating surface.
• the counter surface is usually formed by a portion of the lateral surface of a roller.
• the new press device is characterized in particular by the fact that the fibrous web is dewatered in the direction of the counter surface by means of the pressing force of the band and the action of at least one fluid flowing in the direction from the press belt to the counter surface.
• higher dry contents of the paper produced in this way, in particular tissue paper are achieved by the extended press nip.
• permeable woven structures are used as press belts, which are woven flat and then subsequently made endless on the machine by means of a connecting seam connection. Since these press belts are subject to tensile stresses of at least 30 kN / M but often between 40 and 70 kN / m, this type of seam proves to be a weak point, in particular with regard to their durability.
• the invention is achieved by an endless belt for a machine for producing a fibrous web, wherein the belt is designed for an application in which a tensile stress of at least 30 kN / m acts on it.
• the tape according to the invention comprises a fabric having a flat woven weave structure and a joining region in which the flat woven weave structure comprises longitudinal yarns extending in the MD direction and first cross yarns interwoven in the CMD direction, in which the flat woven weave structure extends longitudinally is delimited by a first longitudinal end and a second longitudinal end, in which each longitudinal thread viewed in its longitudinal extent has a first thread end portion, which protrudes in the MD direction over the first longitudinal end of the weave structure, and a second thread end portion, in the MD direction protruding beyond the second longitudinal end of the weave structure, wherein the two longitudinal ends of the flat weave weave are joined together to make the tape endless by the joining portion formed by interweaving the first and second end portions of the longitudinal threads with second transverse threads is and in this case forms a
• the tape according to the invention comprises a fabric. Through interwoven Longitudinal and transverse threads, a structure is provided, which is able to absorb high tensile stresses.
• the connecting region is formed in the band according to the invention so that the yarn end portions of the longitudinal threads in the MD direction in the connection region extend and are woven to form the connecting portion with other transverse threads, the longitudinal thread sections, which face each other in the endless, pairs of in the CMD direction, when viewed immediately adjacent to each other, form first and second longitudinal thread end portions, each viewed in the MD direction, in a common portion of at least 15 consecutive transverse threads, weaving the same weave path.
• the tape of the present invention is typically made by first making the flat weave weave structure and subsequently assembling it through the woven joint area to form an endless belt. Then the endless belt is fed into the machine.
• each overlapping area in the MD direction is terminated by the fact that the first and the second thread end portion is guided to an outer side of the fabric.
• Applicant's experiments have shown that, depending on the tensile stress involved in the specific application, it may be expedient if the overlapping regions comprise up to 60 consecutive second transverse threads.
• the overlapping regions comprise 18 to 25 consecutive second transverse threads.
• each overlapping area comprises the same number of second transverse threads.
• the first and the second transverse threads are identical in their shape and shape and the material from which they are made.
• connection region is reinforced at least in sections additionally with polymer material or adhesive, which was preferably brought to the connection region in the liquid state and an adhesive connection between the first and second Fadenendabroughen in their respective overlap region manufactures.
• the polymer material or the adhesive may in this case have been applied in particular in such a way that the permeability in this range is not less than in the case of extenders without liquid-applied adhesive or liquid-applied polymer material. This can be done, for example, by the adhesive or the polymer material, which accumulates in the fabric meshes, being blown away by means of compressed air.
• the two end portions of a pair of yarns in the overlapping region at least partially welded together. This can be done, for example, by ultrasonic welding.
• the overlapping areas arranged next to one another in the CMD direction are offset relative to one another in the MD direction.
• the extended connection area provides improved durability of the connection.
• the offset achieves that the overlap areas are not all arranged along a single CMD-directional line, thereby preventing a potential marking tendency of the tape at that location.
• the relative offset in the MD direction preferably comprises overlapping regions 20 to 60, preferably 30 to 40 consecutive second transverse threads arranged directly next to one another in the CD direction.
• a multiplicity of successive overlapping regions each have the same offset relative to one another.
• a further particularly preferred embodiment of the invention provides that the flat woven weave structure and the connection region have the same weave pattern.
• the weave pattern of the flat woven weave structure preferably continues through the weave pattern of the joining region without an offset occurring between the two weave patterns. This makes it possible to provide an endless belt which has the same properties over its entire length and over the connection area. This creates an endless belt in which the joint area has the same properties as the flat woven weave structure.
• the fabric of the tape of the invention may be both single ply, i. with one longitudinal thread and one transverse thread layer as well as two or more layers, i. be formed with two or more longitudinal and / or transverse thread layers.
• the weave pattern of the press belt is repeated in Repeat units.
• a variety of types of bonding come into consideration.
• a repeat unit can form either a plain weave or a 5-strand satin weave.
• the arrangement of the overlapping areas is repeated in rapports, in which case it makes sense if the repeat of the arrangement of the overlapping areas comprises more longitudinal threads and / or more transverse threads than the repeat of the flat woven structure.
• connection area defined by the two overlapping areas, which are viewed in the MD direction, are the most widely spaced, between 5 cm and 100 cm, preferably between 10cm and 70cm, more preferably between 40cm and 60cm.
• the entire connecting region in the MD direction can extend 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.
• a concrete embodiment of the invention provides that the endless belt is formed only by the tissue.
• the tape according to the invention is used as a press belt in a belt press device, dewatering of the fibrous web takes place in that the fibrous web is simultaneously dewatered in the direction of the counter 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 to the counter surface.
• the tape is permeable and preferably has a permeability between 100cfm and 1200cfm, preferably between 300cfm and 800cfm.
• the band is designed for an application in which a tension between 40 and 70 N / m acts on the band.
• the longitudinal threads are warp threads and the transverse threads are weft threads.
• the invention relates to an improved press apparatus for a machine for producing a fibrous web, in which an endless belt as described above is used as a press belt, wherein the band is under a tensile stress of at least 30kN / m and guided over an opposing surface to provide an extended press nip is, which is preferably formed by a portion of the lateral surface of a roller, in particular suction roll, wherein the fibrous web between the band and the counter surface is guided and the belt exerts a pressing force on the fibrous web due to its tensile stress.
• the tissue web is guided in a sandwich of upper permeable clothing and lower permeable clothing through the press device according to the invention, so that, as a result, the following structure is present:
• the upper permeable covering is preferably a three-dimensionally structured sieve, such as, for example, a TAD sieve.
• the lower permeable fabric is preferably a press felt.
• a press machine equipped with the belt of the present invention operates significantly more reliably than a conventional press machine equipped with a conventional press belt due to the more stable formation of the joint portion.
• the tape according to the invention has an open area of at least 25% and a contact area of at least 10% of its total has upper clothing facing surface.
• Figure 1 shows a press apparatus, which with a band according to the invention as
• Figure 3 shows the relative arrangement of the overlapping areas to each other in plan view of the tape of Figure 2
• Figure 4 in plan view in sections the connection area and the flat woven structure of the tape of the invention of Figures 2 and 4
• Figure 5 in Top view in sections of the connecting region and the flat woven structure of another tape according to the invention.
• FIG. 1 shows a machine 1 for producing a fibrous web 2, which is equipped with a press device 3 with a band 4 according to the invention as a press belt.
• the fibrous web 2 which in the present case is a tissue web, is formed in a forming section 5 of the machine 1 by moving a liquid pulp suspension into the inlet gap 6 between a conventional web permeable and flat Formiersieb 7 and a permeable and three-dimensionally structured sieve 8 is introduced.
• the structured sieve 8 in this case has a surface contacting the fibrous web, which has larger elevations and depressions compared to the surface of the flat sieve 7 contacting the fibrous web.
• the forming fabric 7 is lifted from the fibrous web 2 and fed the fibrous web 2 on the structured sieve 8 of the press device 3.
• the endless belt 4 according to the invention is used as a press belt.
• the press belt 4 is in the press device 3 under a tensile stress of at least 30kN / m.
• the press belt 4 is guided over an opposing surface, which in the present case is formed by a section of the lateral surface of a suction roll 10 in the region of a suction zone Z.
• the tissue web 2 is guided in a sandwich between the permeable, three-dimensionally structured sieve 8 and a permeable, smooth press belt-shaped belt 11.
• the press belt 4 contacts the structured wire 8 and the press felt 11 is supported on the outer surface of the suction roll 10. Due to its tensile stress, the press belt 4 exerts a pressing force on the sandwich consisting of structured wire 8, fibrous web 2 and press felt 11.
• a blowing device 16 is arranged which causes a fluid stream of hot air and / or steam to flow through the press belt 4, the structured wire 8, the fibrous web 2 and the press belt 11 to the suction zone Z. Accordingly, in the press apparatus 3, the fibrous web 2 is dewatered by the simultaneous action of the pressing force of the band 4 on the fibrous web 2 and the fluid flowing in the direction from the press belt 4 to the counter surface through the fibrous web 2. After passing through the press device 3, the press felt 11 is lifted off the fibrous web 2 and fed onto the structured wire to a press nip 14 formed between a press roll 12 and a Yankee drying cylinder 13 for further dewatering.
• the fibrous web 2 After passing through the press nip 14, the fibrous web 2 is lifted off the structured sieve 8 and guided on the lateral surface of the Yankee drying cylinder 13 to be subsequently lifted off from it by means of a doctoring device 15 thereof.
• FIG. 2 shows the warp thread courses of a repeat unit of the strip 4 according to the invention, which is used in the machine of FIG.
• the band 4 has the illustrated warp path both in the area of the flat-woven structure and in the connection area, wherein the weave pattern of the fabric continues from the flat-woven structure into the connection area without interruption or offset.
• each warp thread K1 to K5 continuously crosses four weft threads on the underside US of the fabric and a weft thread runs on the upper side OS of the fabric.
• the warp thread K1 on the underside US continuously crosses the four successive weft threads S1 to S4 before it continuously crosses the weft thread S5 on the upper side OS.
• weft threads are simply labeled according to their position and not according to whether they are first or second weft threads (Berne: the number in front of the name indicates whether this is a first or second weft thread, and the number is given the designation the position of the weft thread).
• Table 1 shows the technical data of the belt according to the invention of FIG. 2.
• FIG. 3a shows the course of one of the warp threads K1 to K5 of the band according to the invention of FIG. 2 in a section of the flat woven weave structure and in a section of the connecting region.
• the weaving path of one of the warp threads K1 to K5 can be seen in sections as it weaves in the manner described in FIG. 2 over a number of repeat patterns. Since all the warp threads K1 to K5 have the same weaving paths, which differ only by a relative offset in the MD direction relative to the 5-strand satin weave shown in FIG. 2, the following is an example of all weaving paths of the warp threads K1 to K5 of a warp repeat of FIG Fabric applicable.
• the pairwise parallel dashes in FIG. 3a indicate an interruption in the representation of the actually continuing weaving path of the warp thread Kx.
• 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-ply fabric 20.
• the fabric 20 is formed by a flat woven weave structure 21 and a joining region 22.
• the flat woven weave structure 21 is formed by interweaving the warp yarns K1 to K5 extending in the MD direction and the first transverse yarns 1S extending therewith in the CMD direction, wherein the first transverse yarns are 1S weft yarns.
• the flat-woven structure 21 is limited in its longitudinal extent by a first longitudinal side end and a second longitudinal side end.
• the two longitudinal ends of the flat woven weave structure are not shown in FIG. 3a for reasons of space, but instead are shown in the illustration of FIG.
• each longitudinal thread Kx viewed in its longitudinal extent has a first thread end section which projects beyond the first longitudinal end of the woven structure in the MD direction, and a second thread end section which projects beyond the second longitudinal end of the woven structure in the MD direction.
• the first yarn end portion of one of the warp yarns K1 to K5 with the reference numeral Kx.1 and the second yarn end portion of the same warp Kx are provided with the reference numeral Kx.2.
• the two longitudinal ends of the flat-woven structure for endless making the band through the connecting portion 22 are interconnected by the first and the second end portions of the longitudinal yarns K1 to K5 are woven with second formed as weft yarns cross-threads 2S so that the weave of the flat woven structure 21 continues without interruption by the weave pattern of the connection region 22.
• the flat-weaved weave structure 21 and the bonding portion 22 have the same weave pattern.
• the yarn end portions When weaving the yarn end portions of the warp yarns K1 to K5, the yarn end portions form a plurality of pairs of first and second yarn end portions in which the two yarn end portions are arranged side by side in the CMD direction and where the two yarn end portions are in the MD direction contemplated forming a common overlap region by interweaving the first end portion of the pair with the same at least 15 consecutive second transverse threads 2S with which the second end portion of the pair is interwoven and in that the two end portions of the pair in the overlap region follow the same weaving path.
• the first and second yarn end sections Kx.1 and Kx.2 of the same longitudinal thread Kx always form a pair in which the two yarn end sections Kx.1 and Kx.2 are arranged next to one another in the CMD direction, ie no yarn end portion of another warp yarn is disposed between the yarn end portions forming the pair.
• the two thread end sections Kx.1 and Kx.2 of the same warp thread Kx form an overlapping area Üy by interweaving the first end section of the pair Kx.1 with the same eighteen consecutive second transverse threads 2S with which the first end section second end section Kx.2 of the pair is interwoven and in that the two end sections Kx.1 and Kx.2 of the pair in the overlapping area Üy follow the same weaving path.
• each overlapping area Üy viewed in the MD direction is completed by the first thread end section Kx.1 and the second thread end section kx.2 being guided to an outer side of the fabric 20.
• the two ends of the overlapping area Üy are designated in FIG. 3a with 1 Ey and 2Ey.
• each overlapping area Ü1 to Ü5 has the same number of second transverse threads.
• FIG. 3b shows the five overlapping areas Ü1 to Ü5 following one another in the CMD direction.
• the offset of mutually adjacent overlapping areas here is in each case 40 second transverse threads 2S, the offset always being determined by the smallest distance of the one end of an overlapping area from the end of the following overlapping area which is closest to the first-mentioned end.
• the offset between the two successive overlapping areas Ü1 and Ü2 is determined by the distance between the end 2E1 of the overlapping area Ü1 and the end 1E2 of the overlapping area Ü2.
• the offset between the two successive overlapping areas Ü2 and Ü3 is set by the distance between the end 2E2 of the overlapping area Ü2 and the end 1E3 of the overlapping area Ü3.
• the principle continues with the other overlapping areas.
• FIG. 4 shows a plan view in sections of the connecting region 22 and the flat woven structure 21 of the band 4 according to the invention of FIGS. 2 and 3.
• FIG. 4 shows, in particular in the connection region 22, the relative arrangement of the overlapping areas relative to one another. Furthermore, FIG. 4 shows a section of the flat-woven structure 21 and the two ends 23 and 24 delimiting the flat-woven structure, which ends are connected to one another by the connection region 22 in the case of the endless belt 4. FIG. 4 shows the band 4 both only in a partial length and only in a partial width.
• connection region shows three in the CMD direction side by side arranged repeats R1, R2, R3 of the arrangement of overlapping areas. Viewed in the MD direction, the connection area extends over the length of a repeat.
• Each repeat R1, R2 and R3 of overlap areas is formed by the overlap areas Ü1 to Ü35. Therefore, the repeat R1, R2 and R3 of the arrangement of the overlapping areas is larger than the repeat forming the weave pattern formed by the warp yarns K1 to K5 and the weft yarns S1 to S5 of the flat-weaved woven structure 21 and the joining area 22, respectively.
• Overlapping areas Ü1 to Ü35 which are arranged next to one another in the CMD direction, are offset relative to one another in the MD direction.
• the two successive overlapping areas Ü1 and Ü2 are staggered by 40 second transverse threads 2S, the offset always being determined by the smallest distance of one end of an overlapping area to the end of the following overlapping area which is closest to the first-mentioned end.
• all of the successive overlapping areas Ü1 to Ü9 each have the same offset from each other.
• All overlapping areas lie on a family of mutually parallel straight lines, whereby successive overlapping areas, each arranged on a straight line, always have the same offset relative to one another and wherein all the straight lines of the crowd are equally spaced from one another.
• connection area defined by the two overlapping areas Ü34 and Ü35, which are viewed in the MD direction, are the most widely spaced, 60 cm.
• the tape is permeable and in the present case has a permeability of 750 cfm.
• FIG. 5 shows a further embodiment of a band 4 according to the invention.
• the present tape 4 viewed in the MD-direction in the connection region 22, has a section A in which all overlapping regions Ua to Üe extend.

Landscapes

• Woven Fabrics (AREA)
• Paper (AREA)
• Impression-Transfer Materials And Handling Thereof (AREA)
• Pens And Brushes (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
• Package Frames And Binding Bands (AREA)
• Packaging Of Special Articles (AREA)
• Auxiliary Devices For And Details Of Packaging Control (AREA)

Priority Applications (10)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=39415119

Family Applications (1)

Country Status (14)

Families Citing this family (3)

Citations (4)

Family Cites Families (8)

• 2007
  • 2007-02-21 DE DE102007008500A patent/DE102007008500A1/de not_active Withdrawn
• 2008
  • 2008-02-15 MX MX2009008917A patent/MX2009008917A/es unknown
  • 2008-02-15 DE DE502008001124T patent/DE502008001124D1/de active Active
  • 2008-02-15 CN CN200880012426A patent/CN101680177A/zh active Pending
  • 2008-02-15 RU RU2009134276/12A patent/RU2009134276A/ru not_active Application Discontinuation
  • 2008-02-15 WO PCT/EP2008/051821 patent/WO2008101865A1/de active Application Filing
  • 2008-02-15 JP JP2009550263A patent/JP2010519420A/ja active Pending
  • 2008-02-15 EP EP08709011A patent/EP2129829B1/de not_active Not-in-force
  • 2008-02-15 CA CA002679296A patent/CA2679296A1/en not_active Abandoned
  • 2008-02-15 BR BRPI0807307-4A2A patent/BRPI0807307A2/pt not_active IP Right Cessation
  • 2008-02-15 ES ES08709011T patent/ES2348063T3/es active Active
  • 2008-02-15 KR KR1020097019466A patent/KR20090125106A/ko not_active Application Discontinuation
  • 2008-02-15 AT AT08709011T patent/ATE477369T1/de active
  • 2008-02-15 PL PL08709011T patent/PL2129829T3/pl unknown
• 2009
  • 2009-08-20 US US12/544,757 patent/US20100032120A1/en not_active Abandoned

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