WO2012013773A1 - Tissu structuré - Google Patents

Tissu structuré Download PDF

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Publication number
WO2012013773A1
WO2012013773A1 PCT/EP2011/063084 EP2011063084W WO2012013773A1 WO 2012013773 A1 WO2012013773 A1 WO 2012013773A1 EP 2011063084 W EP2011063084 W EP 2011063084W WO 2012013773 A1 WO2012013773 A1 WO 2012013773A1
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WO
WIPO (PCT)
Prior art keywords
fabric
yarns
float
weave pattern
long
Prior art date
Application number
PCT/EP2011/063084
Other languages
English (en)
Inventor
Scott Quigley
Original Assignee
Voith Patent Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2012013773A1 publication Critical patent/WO2012013773A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/02—Patterned paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper

Definitions

  • the present invention relates generally to papermaking, and relates more specifically to a structured fabric employed in papermaking.
  • a water slurry, or suspension, of cellulosic fibers (known as the paper "stock") is fed into a gap between two endless woven wires that travels between two or more rolls.
  • At least one of the wires are often referred to as a "structured fabric” that provides a papermaking surface on the upper surface of its upper ran which operates as a filter to separate the cellulosic fibers of the paper stock from the aqueous medium, thereby forming a wet paper web.
  • the aqueous medium drains through mesh openings of the structured fabric, known as drainage holes, by gravity or vacuum located on the lower surface of the upper run (i.e., the "machine side") of the fabric.
  • the paper web is transferred to a press section of the paper machine, where it is passed through the nips of one or more pairs of pressure rollers covered with another fabric, typically referred to as a "press felt.” Pressure from the rollers removes additional moisture from the web; the moisture removal is often enhanced by the presence of a "batt" layer of the press felt.
  • the paper is then transferred to a dryer section for further moisture removal. After drying, the paper is ready for secondary processing and packaging.
  • papermakers' fabrics are manufactured as endless belts by one of two basic weaving techniques.
  • fabrics are flat woven by a flat weaving process, with their ends being joined to form an endless belt by any one of a number of well- known joining methods, such as dismantling and reweaving the ends together (commonly known as splicing), or sewing on a pin-seamable flap or a special foldback on each end, then reweaving these into pin-seamable loops.
  • a number of auto-joining machines are available, which for certain fabrics may be used to automate at least part of the joining process.
  • the warp yarns extend in the machine direction and the filling yarns extend in the cross machine direction.
  • Effective sheet and fiber support are important considerations in papermaking, especially for the forming section of the papermaking machine, where the wet web is initially formed. Additionally, the structured fabrics should exhibit good stability when they are run at high speeds on the papermaking machines, and preferably are highly permeable to reduce the amount of water retained in the web when it is transferred to the press section of the paper machine.
  • tissue and fine paper applications i.e., paper for use in quality printing, carbonizing, cigarettes, electrical condensers, and the like
  • the papermaking surface comprises a very finely woven or fine wire mesh structure.
  • the sheet is formed flat. At the press section, 100% of the sheet is pressed and compacted to reach the necessary dryness and the sheet is further dried on a Yankee and hood section. The sheet is then creped and wound-up, thereby producing a flat sheet.
  • a sheet is formed on a structured or molding fabric and the sheet is further sandwiched between the structured or molding fabric and a dewatering fabric. The sheet is dewatered through the dewatering fabric and opposite the molding fabric. The dewatering takes place with airflow and mechanical pressure. The mechanical pressure is created by a permeable belt and the direction of air flow is from the permeable belt to the dewatering fabric.
  • a big advantage of the ATMOSTM system is that it utilizes a permeable belt which is highly tensioned, e.g., about 60 kN/m. This belt enhances the contact points and intimacy for maximum vacuum dewatering. Additionally, the belt nip is more than 20 times longer than a conventional press and utilizes airflow through the nip, which is not the case on a conventional press system.
  • the fabric utilizes an at least three float warp and weft structure which, like the prior art fabrics, is symmetrical in form.
  • U.S. Pat. No. 5,429,686 to CHIU et al. discloses structured forming fabrics which utilize a load-bearing layer and a sculptured layer.
  • the fabrics utilize impression knuckles to imprint the sheet and increase its surface contour.
  • This document does not create pillows in the sheet for effective dewatering of TAD applications, nor does it teach using the disclosed fabrics on an ATMOSTM system and/or forming the pillows in the sheet while the sheet is relatively wet and utilizing a hi-tension press nip.
  • the invention provides a fabric for a papermaking machine, the fabric including a single layer of yarns arranged in a repeating weave pattern, each weave pattern including a plurality of warp yarns substantially oriented in a machine direction (MD) defining MD yarns; and a plurality of weft yarns substantially oriented in a cross machine direction (CD) defining CD yarns.
  • MD yarns each having at least one long float within the weave pattern. Each long float being adjacent to at least one other long float of an MD yarn.
  • the weave pattern being a plain weave apart from the long floats.
  • Fig. 1 shows a repeating weave pattern having a square shape of a top side or paper facing side of an embodiment of a structured fabric of the present invention, each X indicating a location where a warp MD yarn passes over a weft CD yarn;
  • Fig. 2 shows the weave pattern of the structured fabric of Fig. 1;
  • Fig. 3 shows a repeating weave pattern having a square shape of a top side or paper facing side of another embodiment of a structured fabric of the present invention, each X V indicating a location where a warp MD yarn passes over a weft CD yarn;
  • Fig. 4 shows the weave pattern of the structured fabric of Fig. 3;
  • Fig. 5 shows a repeating weave pattern having a square shape of a top side or paper facing side of yet another embodiment of a structured fabric of the present invention, each indicating a location where a warp MD yarn passes over a weft CD yarn;
  • Fig. 6 shows the weave pattern of the structured fabric of Fig. 5;
  • Fig. 7 shows a repeating weave pattern having a square shape of a top side or paper facing side of yet another embodiment of a structured fabric of the present invention, each "X" indicating a location where a warp MD yarn passes over a weft CD yarn;
  • Fig. 8 shows the weave pattern of the structured fabric of Fig. 7;
  • Fig. 9 shows a repeating weave pattern having a square shape of a top side or paper facing side of yet another embodiment of a structured fabric of the present invention, each "X" indicating a location where a warp MD yarn passes over a weft CD yarn;
  • Fig. 10 shows the weave pattern of the structured fabric of Fig. 9;
  • Fig. 11 shows a repeating weave pattern having a square shape of a top side or paper facing side of yet another embodiment of a structured fabric of the present invention, each V X indicating a location where a warp MD yarn passes over a weft CD yam;
  • Fig. 12 shows the weave pattern of the structured fabric of Fig. 11;
  • Fig. 13 shows a repeating weave pattern having a square shape of a top side or paper facing side of yet another embodiment of a structured fabric of the present invention, each X" indicating a location where a warp MD yarn passes over a weft CD yarn;
  • Fig. 14 shows the weave pattern of the structured fabric of Fig. 13;
  • Fig. 15 shows a repeating weave pattern having a square shape of a top side or paper facing side of yet another embodiment of a structured fabric of the present invention, each "X indicating a location where a warp MD yarn passes over a weft CD yarn;
  • Fig. 16 shows the weave pattern of the structured fabric of Fig. 15;
  • Fig. 17 shows a repeating weave pattern having a square shape of a top side or paper facing side of yet another embodiment of a structured fabric of the present invention, each indicating a location where a warp MD yarn passes over a weft CD yarn;
  • Fig. 18 shows the weave pattern of the structured fabric of Fig. 17;
  • Fig. 19 shows a repeating weave pattern having a square shape of a top side or paper facing side of yet another embodiment of a structured fabric of the present invention, each ⁇ X" indicating a location where a warp MD yarn passes over a weft CD yarn;
  • Fig. 20 shows the weave pattern of the structured fabric of Fig. 19;
  • Fig. 2 shows a repeating weave pattern having a square shape of a top side or paper facing side of yet another embodiment of a structured fabric of the present invention, each "X" indicating a location where a warp MD yarn passes over a weft CD yarn;
  • Fig. 22 shows the weave pattern of the structured fabric of Fig. 21;
  • Fig. 23 shows a repeating weave pattern having a square shape of a top side or paper facing side of yet another embodiment of a structured fabric of the present invention, each "X" indicating a location where a warp MD yarn passes over a weft CD yarn;
  • Fig. 24 shows the weave pattern of the structured fabric of Fig. 23;
  • Fig. 25 shows a repeating weave pattern having a square shape of a top side or paper facing side of yet another embodiment of a structured fabric of the present invention, each X" indicating a location where a warp MD yarn passes over a weft CD yarn;
  • Fig. 26 shows the weave pattern of the structured fabric of Fig. 25;
  • Fig. 27 shows a repeating weave pattern having a square shape of a top side or paper facing side of yet another embodiment of a structured fabric of the present invention, each "X' indicating a location where a warp MD yarn passes over a weft CD yarn;
  • Fig. 28 shows the weave pattern of the structured fabric of Fig. 27;
  • Fig. 29 illustrates a schematic cross-sectional view of an embodiment of an ATMOS papermaking machine;
  • Fig. 30 illustrates a schematic cross-sectional view of another embodiment of an ATMOSTM papermaking machine
  • FIG. 31 illustrates a schematic cross-sectional view of another embodiment of an ATMOSTM papermaking machine
  • FIG. 32 illustrates a schematic cross-sectional view of another embodiment of an ATMOSTM papermaking machine
  • FIG. 33 illustrates a schematic cross-sectional view of another embodiment of an ATMOSTM papermaking machine
  • Fig. 34 illustrates a schematic cross-sectional view of another embodiment of an ATMOSTM papermaking machine.
  • Fig. 35 illustrates a schematic cross-sectional view of another embodiment of an ATMOSTM papermaking machine.
  • the present invention relates to a structured fabric for a papermaking machine, a former for manufacturing a paper web, and also to a former which utilizes the structured fabric, and in some embodiments a belt press, in a papermaking machine.
  • the present invention also relates to a twin wire former ATMOSTM system which utilizes the structured fabric which has good resistance to pressure and excessive tensile strain forces, and which can withstand wear/hydrolysis effects that are experienced in an ATMOSTM system.
  • the system may also include a permeable belt for use in a high tension extended nip around a rotating roll or a stationary shoe and a dewatering fabric for the manufacture of premium tissue or towel grades.
  • the fabric has key parameters which include permeability, weight, caliper, and certain compressibility.
  • Fig. 1 depicts a weave pattern 10 from a top pattern view of the web facing side of the fabric (i.e., a view of the papermaking surface).
  • the numbers 1-20 shown on the bottom of the pattern identify the warp, machine direction (MD) yarns while the right side numbers 1-20 show the weft, cross-direction (CD) yarns.
  • the symbol X illustrates a location where a warp yarn passes over a weft yarn and an empty box illustrates a location where a warp yarn passes under a weft yarn.
  • the areas that are shaded indicate long float warp yams, which float over at least two weft yarns.
  • the shaded areas form a MD float pattern, while the non-shaded areas represent a plain weave pattern.
  • the weave patterns of Figs. 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, and 27 illustrate other embodiments of the present invention.
  • Fig. 2 illustrates the weave pattern of the MD yarns relative to the CD yarns with the CD yarns being represented in each line as the numbers, with the line being the pattern of the MD yarn.
  • Fig. 4 corresponds to Fig 3 and so on with the even numbered figures through Fig. 28, corresponding to the odd numbered figure that is numerically one less than the even numbered Fig.
  • the fabric of Figs. 1-28 illustrates a repeating weave pattern square of the fabric that encompasses twenty MD warp yarns (yarns 1 -20 numbered along the bottom of each pattern) and twenty weft yarns (yarns 1-20 that are numbered along the right side of each pattern).
  • MD warp yarns There are long floats of the MD warp yarns over the weft yarns, with the long float being over at least two weft yarns, and in most patterns over at least three weft yarns.
  • the MD warp yarn float is over at least four or even over at least five weft yarns.
  • the MD warp yarns have there long float they are always adjacent to at least one other MD warp yarn that is also undergoing a long float.
  • the float beginning and ending are offset in the MD by one weft yarn position.
  • the contiguous adjacent MD warp yarns form an MD yarn float pattern, with at least one being present in each weave pattern 10.
  • the MD yarn float patterns are replicated in weave pattern 10, and includes mirror-image or reflected MD yarn float patterns.
  • the MD yarn float patterns can be symmetrical or asymmetrical. For example, in Fig.
  • Fig. 3 there are MD yam float patterns that are mirror-images and are symmetrical.
  • the MD yarns float over three weft yarns and are three MD yarns wide.
  • the weave of the single layer fabric is a simple weave pattern.
  • the plain weave pattern surrounds the MD yarn float patterns.
  • the simple weave patterns appear surrounded by MD yarn float patterns.
  • the parameters of the structured fabric shown in Figs. 1-28 can have a mesh (number of warp yarns per inch) and a count (number of weft yarns per inch) of any amount.
  • the single- layered fabric should have a high permeability value due to the nature of a single layer fabric and the way it is woven.
  • yarn dimensions the particular size of the yarns is typically governed by the mesh of the papermaking surface and the yarn size can be selected based upon the intended use. Fabrics employing these yarn sizes may be implemented with polyester yarns or with a combination of polyester and nylon yarns.
  • the structured fabric can also be treated and/or coated with an additional polymeric material that is applied by, e.g., deposition.
  • the material can be added cross-linked during processing in order to enhance fabric stability, contamination resistance, drainage, wearability, improve heat and/or hydrolysis resistance and in order to reduce fabric surface tension. This aids in sheet release and/or reduced drive loads.
  • the treatment/coating can be applied to
  • the topographical pattern in the paper web can be changed and manipulated by use of different single -layer weaves. Further enhancement of the pattern can be attained by adjustments to the specific fabric weave by changes to the yarn diameter, yarn counts, yarn types, yarn shapes, permeability, caliper and the addition of a treatment or coating etc.
  • a printed design such as a screen-printed design, of polymeric material can be applied to the fabric to enhance its ability to impart an aesthetic pattern into the web or to enhance the quality of the web.
  • one or more surfaces of the fabric or molding belt can be subjected to sanding and/or abrading in order to enhance surface characteristics.
  • the characteristics of the individual yarns utilized in the fabric of the present invention can vary depending upon the desired properties of the final papermakers' fabric.
  • the materials comprising yarns employed in the fabric of the present invention may be those commonly used in papermakers' fabric.
  • the yarns may be formed of polypropylene, polyester, nylon, or the like. The skilled artisan should select a yarn material according to the particular application of the final fabric.
  • the structured fabric is a single-layered woven fabric which can withstand high pressures, heat, moisture concentrations, and which can achieve a high level of water removal and also mold or emboss the paper web. These characteristics provide a structured fabric appropriate for the Voith ATMOSTM papermaking process.
  • the fabric preferably has a width stability and a suitable high permeability and preferably utilizes hydrolysis and/or temperature resistant materials, as discussed above.
  • the fabric is preferably a woven fabric that can be installed on an ATMOSTM machine as a pre-joined and/or seamed continuous and/or endless belt. Alternatively, the structured fabric can be joined in the
  • ATMOSTM machine using, e.g., a pin-seam arrangement or can otherwise be seamed on the machine.
  • the invention also provides for utilizing the structured fabric disclosed herein on a machine for making a fibrous web, e.g., tissue or hygiene paper web, etc., which can be, e.g., a twin wire + a permeable belt ATMOSTM system.
  • a fibrous web machine including a headbox 22 that discharges a fibrous slurry between a forming fabric 26 and a structured fabric 28 having a weave pattern 10.
  • structured fabric 28 is an embodiment of the structured fabric discussed above in connection with Figs. 1-28.
  • Rollers 30 and 32 direct fabric 26 in such a manner that tension is applied thereto, against slurry 24 and structured fabric 28.
  • Structured fabric 28 is supported by forming roll 34 which rotates with a surface speed that matches the speed of structured fabric 28 and forming fabric 26. Structured fabric 28 has peaks and valleys as defined by weave pattern 10, which give a corresponding structure to web 38 formed thereon. Structured fabric 28 travels in a web direction, and as moisture is driven from the fibrous slurry, structured fibrous web 38 takes form. The moisture that leaves the slurry travels through forming fabric 26.
  • the fibrous slurry is formed into a web 38 with a structure that matches the shape of structured fabric 28.
  • Forming fabric 26 is porous and allows moisture to escape during forming. Further, water is removed through dewatering fabric 82. The removal of moisture through fabric 82 does not cause compression of web 38 traveling on structured fabric 28.
  • Structured fabric 28 carries a three dimensional structured fibrous web 38 to an advanced dewatering system 50, past vacuum box 67 and then to a position where the web is transferred to Yankee dryer 52 and hood section 54 for additional drying and creping before winding up on a reel (not shown).
  • a shoe press 56 is placed adjacent to structured fabric 28, holding fabric 28 in a position proximate Yankee dryer 52. Structured fibrous web 38 comes into contact with Yankee dryer 52 and transfers to a surface thereof, for further drying and subsequent creping.
  • a vacuum box 58 is placed adjacent to structured fabric 28 to achieve improved solids levels.
  • Web 38 which is carried by structured fabric 28, contacts dewatering fabric 82 and proceeds toward vacuum roll 60.
  • Vacuum roll 60 operates at a vacuum level of -0.2 to -0.8 bar with a preferred operating level of at least -0.4 bar.
  • Hot air hood 62 is optionally fit over vacuum roll 60 to improve dewatering.
  • a steam box can be installed instead of the hood 62 supplying steam to the web 38.
  • the steam box preferably has a sectionahzed design to influence the moisture re-dryness cross profile of the web 38.
  • the length of the vacuum zone inside the vacuum roll 60 can be from 200 mm to 2,500 mm, with a preferable length of 300 mm to 1,200 mm and an even more preferable length of between 400 mm to 800 mm.
  • the solids level of web 38 leaving suction roll 60 is 25% to 55% depending on installed options.
  • a vacuum box 67 and hot air supply 65 can be used to increase web 38 solids after vacuum roll 60 and prior to Yankee dryer 52.
  • Wire turning roll 69 can also be a suction roll with a hot air supply hood.
  • roll 56 includes a shoe press with a shoe width of 80 mm or higher, preferably 120 mm or higher, with a maximum peak pressure of less than 2.5 MPa.
  • shoe press with a shoe width of 80 mm or higher, preferably 120 mm or higher, with a maximum peak pressure of less than 2.5 MPa.
  • FIG. 30 there is shown yet another embodiment of the present invention, which is substantially similar to the invention illustrated in Fig. 29, except that instead of hot air hood 62, there is a belt press 64.
  • Belt press 64 includes a permeable belt 66 capable of applying pressure to the machine side of structured fabric 28 that carries web 38 around vacuum roll 60.
  • Fabric 66 of belt press 64 is also known as an extended nip press belt or a link fabric, which can run at 60 KN/m fabric tension with a pressing length that is longer than the suction zone of roll 60.
  • Belt 66 is a specially designed extended nip press belt 66, made of, for example reinforced polyurethane and/or a spiral link fabric. Belt 66 also can have a woven construction. Such a woven construction is disclosed, e.g., in EP 1837439. Belt 66 is permeable thereby allowing air to flow there through to enhance the moisture removing capability of belt press 64. Moisture is drawn from web 38 through dewatering fabric 82 and into vacuum roll 60.
  • FIG. 31 there is shown another embodiment of the present invention which is substantially similar to the embodiment shown in Fig. 30 with the addition of hot air hood 68 placed inside of belt press 64 to enhance the dewatering capability of belt press 64 in conjunction with vacuum roll 60.
  • Fig. 32 there is shown yet another embodiment of the present invention, which is substantially similar to the embodiment shown in Fig. 30, but including a boost dryer 70 which encounters structured fabric 28.
  • Web 38 is subjected to a hot surface of boost dryer 70, and structured web 38 rides around boost dryer 70 with another woven fabric 72 riding on top of structured fabric 28.
  • On top of woven fabric 72 is a thermally conductive fabric 74, which is in contact with both woven fabric 72 and a cooling jacket 76 that applies cooling and pressure to all fabrics and web 38.
  • the pressing process does not negatively impact web quality.
  • the drying rate of boost dryer 70 is above 400 kg/hr m 2 and preferably above 500 kg/hr m 2 .
  • boost dryer 70 provides sufficient pressure to hold web 38 against the hot surface of the dryer thus preventing blistering.
  • Steam that is formed at the knuckle points of fabric 28 passes through fabric 28 and is condensed on fabric 72.
  • Fabric 72 is cooled by fabric 74 that is in contact with cooling jacket 76, which reduces its temperature to well below that of the steam.
  • cooling jacket 76 reduces its temperature to well below that of the steam.
  • the condensed water is captured in woven fabric 72, which is de watered by dewatering device 75. It has been shown that depending on the size of boost dryer 70, the need for vacuum roll 60 can be eliminated. Further, depending on the size of boost dryer 70, web 38 may be creped on the surface of boost dryer 70, thereby eliminating the need for Yankee dryer 52.
  • FIG. 33 there is shown yet another embodiment of the present invention substantially similar to the invention disclosed in Fig. 30 but with an addition of an air press 78, which is a four roll cluster press that is used with high temperature air and is referred to as a High Pressure Through Air Dryer (HPT AD) for additional web drying prior to the transfer of web 38 to Yankee dryer 52.
  • An air press 78 which is a four roll cluster press that is used with high temperature air and is referred to as a High Pressure Through Air Dryer (HPT AD) for additional web drying prior to the transfer of web 38 to Yankee dryer 52.
  • Four-roll cluster press 78 includes a main roll, a vented roll, and two cap rolls. The purpose of this cluster press is to provide a sealed chamber that is capable of being pressurized.
  • the pressure chamber contains high temperature air, for example, 150° C or higher and is at a significantly higher pressure than conventional TAD technology, for example, greater than 1.5 psi resulting in a much higher drying rate than a conventional TAD.
  • the high-pressure hot air passes through an optional air dispersion fabric, through web 38 and fabric structured 28 into a vent roll.
  • the air dispersion fabric may prevent web 38 from following one of the cap rolls.
  • the air dispersion fabric is very open, having a permeability that equals or exceeds that of fabric structured 28.
  • the drying rate of the HPT AD depends on the solids content of web 38 as it enters the HPTAD.
  • the preferred drying rate is at least 500 kg/hr m 2 , which is a rate of at least twice that of conventional TAD machines.
  • the compact size of the HPTAD allows for easy retrofitting to an existing machine.
  • the compact size of the HPTAD and the fact that it is a closed system means that it can be easily insulated and optimized as a unit to increase energy efficiency.
  • FIG. 34 there is shown another embodiment of the present invention. This is significantly similar to the embodiments shown in Figs. 30 and 33 except for the addition of a two-pass HPTAD 80.
  • two vented rolls are used to double the dwell time of structured web 38 relative to the design shown in Fig. 33.
  • An optional coarse mesh fabric may be used as in the previous embodiment.
  • Hot pressurized air passes through web 38 carried on structured fabric 28 and onto the two vent rolls. It has been shown that depending on the configuration and size of the HPTAD, more than one HPTAD can be placed in series, which can eliminate the need for roll 60.
  • a conventional twin wire former 90 may be used to replace the crescent former shown in previous examples.
  • the forming roll can be either a solid or open roll. If an open roll is used, care must be taken to prevent significant dewatering through the structured fabric to avoid losing basis weight in the pillow areas.
  • the outer forming fabric 93 can be either a standard forming fabric or one such as that disclosed in U.S. Pat. No. 6,237,644.
  • the inner fabric 91 should be a structured fabric that is much coarser than the outer forming fabric 90.
  • inner fabric 91 may be similar to structured fabric 28.
  • a vacuum roll 92 may be needed to ensure that the web stays with structured fabric 91 and does not go with outer wire 90.
  • Web 38 is transferred to structured fabric 28 using a vacuum device.
  • the transfer can be a stationary vacuum shoe or a vacuum assisted rotating pick-up roll 94.
  • the second structured fabric 28 is at least the same coarseness and preferably coarser than first structured fabric 91.
  • the process from this point is the same as the process previously discussed in conjunction with Fig. 30.
  • the registration of the web from the first structured fabric to the second structured fabric is not perfect, and as such some pillows will lose some basis weight during the expansion process, thereby losing some of the benefit of the present invention.
  • this process option allows for running a differential speed transfer, which has been shown to improve some sheet properties. Any of the arrangements for removing water discussed above as may be used with the twin wire former arrangement and a conventional TAD.

Abstract

L'invention concerne un tissu pour une machine de fabrication de papier, le tissu comprenant une couche unique de fils organisés en un dessin d'armure répétitif, ledit dessin d'armure comprenant une pluralité de fils de chaîne pratiquement orientés dans la direction de la machine (MD) définissant des fils MD et une pluralité de fils de trame pratiquement orientés dans la direction perpendiculaire à la machine (CD) définissant des fils CD, les fils MD comportant chacun au moins un long flotté dans le dessin d'armure, chaque long flotté étant adjacent à au moins un autre long flotté d'un fil MD, le dessin d'armure étant une armure toile excepté pour les longs flottés.
PCT/EP2011/063084 2010-07-30 2011-07-29 Tissu structuré WO2012013773A1 (fr)

Applications Claiming Priority (2)

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US12/847,519 US20120024489A1 (en) 2010-07-30 2010-07-30 Structured fabric
US12/847,519 2010-07-30

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WO2012013773A1 true WO2012013773A1 (fr) 2012-02-02

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PCT/EP2011/063093 WO2012013778A1 (fr) 2010-07-30 2011-07-29 Toile fibreuse formée sur un tissu structuré
PCT/EP2011/063101 WO2012013781A1 (fr) 2010-07-30 2011-07-29 Toile fibreuse formée sur un tissu structuré
PCT/EP2011/063084 WO2012013773A1 (fr) 2010-07-30 2011-07-29 Tissu structuré

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PCT/EP2011/063093 WO2012013778A1 (fr) 2010-07-30 2011-07-29 Toile fibreuse formée sur un tissu structuré
PCT/EP2011/063101 WO2012013781A1 (fr) 2010-07-30 2011-07-29 Toile fibreuse formée sur un tissu structuré

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WO (3) WO2012013778A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017178414A1 (fr) 2016-04-15 2017-10-19 Voith Patent Gmbh Procédé et bande de formation pour produire une bande de matière fibreuse

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202014001502U1 (de) * 2013-03-01 2014-03-21 Voith Patent Gmbh Gewobenes Sieb mit flachen Kettfäden
SE537959C2 (sv) 2013-03-27 2015-12-08 Valmet Aktiebolag Rullstol och förfarande för upprullning av en pappersbana itorränden av en pappersmaskin
SE537744C2 (sv) * 2013-04-26 2015-10-13 Valmet Aktiebolag Rullstol för upprullning av en pappersbana till en rulle ochförfarande för upprullning av en pappersbana för att bildaen rulle
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US20120024486A1 (en) 2012-02-02
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WO2012013778A1 (fr) 2012-02-02

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