EP2880216B1 - Machine permettant de fabriquer une bande de matière fibreuse au moyen d'un dispositif de formation à bande oblique et d'un dispositif d'élimination d'eau - Google Patents

Machine permettant de fabriquer une bande de matière fibreuse au moyen d'un dispositif de formation à bande oblique et d'un dispositif d'élimination d'eau Download PDF

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Publication number
EP2880216B1
EP2880216B1 EP13745132.4A EP13745132A EP2880216B1 EP 2880216 B1 EP2880216 B1 EP 2880216B1 EP 13745132 A EP13745132 A EP 13745132A EP 2880216 B1 EP2880216 B1 EP 2880216B1
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EP
European Patent Office
Prior art keywords
fibrous web
belt
roller
watering
press
Prior art date
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Application number
EP13745132.4A
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German (de)
English (en)
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EP2880216A1 (fr
Inventor
Klaus Afflerbach
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Voith Patent GmbH
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Voith Patent GmbH
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    • 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
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • 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
    • D21F1/10—Wire-cloths
    • 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
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • 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
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
    • 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
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • 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
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D21F11/145—Making cellulose wadding, filter or blotting paper including a through-drying process
    • 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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor
    • 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
    • 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
    • D21F3/0281—Wet presses in combination with a dryer roll
    • 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
    • D21F3/10—Suction rolls, e.g. couch rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/12—Drying
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type

Definitions

  • the present invention relates to a fibrous web forming device with a bias tape former, a bias tape headbox and a dewatering device. Furthermore, the invention relates to a machine for producing a fibrous web with such a fibrous web forming device and the use of such a dewatering device in a machine for producing a fibrous web.
  • Special fibrous web products such as long-fiber papers, wet webs or filter media for a wide range of applications can be produced with a fibrous material-forming device that has a bias-belt former and a bias-belt headbox.
  • the advantage of the bias tape technique is the possibility of forming voluminous fibrous web products that are excellent e.g. suitable for the areas of application described above.
  • a fibrous suspension with a comparatively low fibrous content is applied to a section of a conveyor belt running at an angle to the horizontal by means of an inclined belt headbox. In the running direction of the fibrous web after the bias belt headbox, this fibrous web resulting from the fibrous suspension must now be successively dewatered.
  • a fibrous web forming device according to the preamble of claim 1 is known from document U.S. 2,488,700 A known.
  • the present invention deals with the problem of specifying an improved or at least an alternative embodiment for a fibrous web-forming device, for a machine for producing a fibrous web with such a fibrous web-forming device and for use of such a dewatering device in a machine for producing a fibrous web , which is characterized in particular by a more efficient and cheaper drying or dewatering and in particular by a possibility for an alternative structure of the fibrous web.
  • a fibrous web forming device with a bias belt former, a bias belt headbox and a dewatering device
  • the bias belt former has at least one conveyor belt that transports the fibrous web in the direction of travel of the same and has a partial section that runs obliquely to the horizontal , in which the bias belt headbox is arranged, by means of which a pulp suspension can be applied to the conveyor belt.
  • the dewatering device has a roller, a dewatering belt lying against the roller and a press belt pressing against the roller, the fibrous web being arranged in the region of the dewatering device between the dewatering belt and the press belt.
  • Bias belt formers or bias belt headboxes are also referred to as inclined wire formers or inclined wire headboxes and should therefore be understood as synonymous.
  • At least one of the belts from the group of conveyor belt, dewatering belt and press belt is expediently permeable, in particular for fluids such as gases and/or liquids.
  • a gentle and efficient dewatering of the fibrous web can be carried out, so that a drying device downstream of the fibrous web formation device can be dimensioned smaller.
  • drying can be carried out more efficiently and cost-effectively overall.
  • the gentle mechanical pressing by means of the Press belt drainage possible with at least partial preservation of the voluminous structure of the fibrous web. This enables the fibrous web to be produced efficiently and cost-effectively while maintaining a voluminous structure.
  • the dewatering effect of the dewatering device is based on the gentle pressing of the fibrous web between the press belt and the dewatering belt, whereby at least some of the fibrous web fluid passes into the dewatering belt and, among other things, the fibrous web is therefore dewatered.
  • a bias-belt headbox is understood to mean a headbox that applies a fibrous stock suspension to the section of the conveyor belt that transports the fibrous web in the direction of travel, running obliquely to the horizontal.
  • headboxes which spray a free jet of fibrous stock suspension from a nozzle under increased pressure, for example onto a Fourdrinier wire or inject it into a gap between two wires
  • the fibrous stock suspension emerging from the inclined belt headbox is usually fixed over the transport path and away from it by lateral limitations , Carried at least partially in the running direction.
  • the embodiment of the headbox is primarily considered.
  • the section in which the bias belt headbox is arranged is also aligned at an angle to the horizontal.
  • the bias tape headbox can have 1, 2, 3, 4, 5 or 6 layers.
  • at least two superimposed layers with a different fiber suspension are applied to the conveyor belt.
  • One or more dewatering elements such as suction boxes or gravimetric dewatering elements, can be arranged opposite the inclined belt headbox on the section of the conveyor belt running obliquely to the horizontal, with which the fibrous suspension can be dewatered to form the fibrous web.
  • the transition from the fibrous suspension to the fibrous web can be designed to be fluent.
  • the fibrous web is usually formed when the individual fibers of the fibrous web material are immobilized as a result of the dewatering, i.e. the dry content of the fibrous web at the point of immobilization is in the range greater than 3% (corresponds to 30 g/l), in particular greater than 4% (corresponds to 40 g/l).
  • the total layer height of the pulp suspension applied to the conveyor belt by the bias belt headbox is very high in bias belt formers and is more than 50 mm, in particular more than 100 mm and in practical cases even more than 300 mm. In the case of multi-shift operation, the layer heights of the individual layers are correspondingly smaller.
  • the pulp suspension leaving the bias belt headbox has a very low solids concentration in order to evenly disperse and form the pulp.
  • the solids concentration at the beginning of the conveyor belt, which forms the forming fabric is less than 5 g/l, preferably less than 2 g/l and in some cases even less than 0.8 g/l. The lowest value can be 0.1 g/l. These low solids concentrations lead to the high layer heights mentioned above.
  • the advantage is a homogeneous dispersion of the solids and a gentle, slow dewatering, which is favored by the sloping course of the bias belt former. This leads to a bulky fibrous web at the end of the immobility point.
  • a bias tape former has a conveyor belt by means of which the fibrous web can be transported in the running direction. At least one sub-section is provided which runs obliquely to the horizontal and in which the bias belt headbox is also arranged and applies the fibrous stock suspension to the conveyor belt. Further dewatering elements such as suction boxes, suction rollers, gravimetric scrapers or the like can be arranged between the bias belt headbox and the dewatering device. The fibrous web can be pre-dewatered by means of these dewatering elements, so that the dewatering performance of the dewatering device can be optimized.
  • Belts as described above and below, are understood to mean screens, woven fabrics, knitted fabrics, tangles, knitted fabrics, felts, nonwovens, fabrics or the like, possibly endless or designed as a loop, which are guided over guide rollers and/or through at least one guide roller are driven.
  • the term strip also includes a flexible roll cover.
  • the fiber suspension has at least one primarily water-suspended fiber.
  • fillers and additives, as well as auxiliaries can also be added to the fibrous suspension.
  • Any type of fibers can be used as fibrous materials made from a wide variety of materials and in any mixture. It is conceivable, for example, to use plastic fibers, aramid fibers, glass fibers, carbon fibers, cellulose fibers from wood, cotton and other plants, wool and other animal fibers, metal fibers or the like. Long fibers are usually primarily used in bias binding technology, but it is also conceivable that a long fiber/short fiber mixture with a different percentage composition is used.
  • cellulose fibers or other natural fibers are used at least in part, their length is greater than 2 mm, in particular greater than 3 mm or even expediently greater than 4 mm. If at least some of the synthetic fibers listed above are used, for example, their length is greater than 4 mm, in particular greater than 5 mm.
  • two-layer fibrous webs are produced with a total mass per unit area in the range from 15 g/m 2 to 250 g/m 2 .
  • the base layer comprises between 50% and 85%, in particular 70% to 80% cellulose fibers.
  • the top layer comprises 15% to 35%, in particular 22% to 28%, of synthetic fibers such as polypropylene fibers.
  • the arrangement is chosen so that the base layer comes into direct contact with the conveyor belt.
  • the top layer is drained through the base layer at least up to the point of immobility.
  • the cover layer comes into direct contact with the dewatering belt. There, the further dewatering of the base layer takes place at least partially through the top layer.
  • the running direction of the fibrous web in the fibrous web-forming device or in the machine for producing a fibrous web is to be understood as meaning the direction and orientation in which the fibrous web is transported through the fibrous web-forming device or the machine. If necessary, the running direction should be determined tangentially. In contrast to this, the machine direction is the production direction, ie the direction between the start and end of the fibrous web forming device.
  • the conveyor belt is arranged in the area of the dewatering device between the dewatering belt and the press belt.
  • the fibrous web previously applied to the conveyor belt remains while passing through the Dewatering device on the conveyor belt, so that a lower design effort in the fibrous web formation device is necessary.
  • the dewatering device can have a blast hood that partially surrounds the roll in the circumferential direction for applying a fluid to at least one blast zone of the roll that is surrounded by the blast hood.
  • the blast hood can be assigned to the roller in the circumferential direction over a circumferential length, that is to say the length of the circular arc of the imaginary circular sector, of 1 m to 3 m, preferably of 1.3 m to 2 m.
  • the corresponding circular sector angle of the blast hood is between 50° and 270°, in particular between 80° and 200° and for example between 90° and 120°.
  • the blast zone can correspond to the circumferential length of the blast hood.
  • the blowing zone comprises only a partial area of the peripheral length assigned to the blowing hood.
  • This partial area can be between 50% and 100% of the circumferential length associated with the blast hood.
  • the diameter of the roller is greater than 1 m, preferably in the range between 1.2 m and 5 m, in particular between 1.5 m and 2.5 m.
  • the blowing zone can be formed by an impingement flow device.
  • the blast hood is preferably supplied with a fluid which is under overpressure.
  • the fibrous web arranged between the blast hood and the roller can be dewatered by the fluid stream drying and the displacement of the fibrous web fluid by the fluid stream into the dewatering belt.
  • the dewatering effect of the press belt can be intensified and supported by the blast hood. Air, heated air, in particular superheated air, steam or the like can be used as the fluid.
  • the dewatering device can have an additional pressing device arranged downstream of the roll in the running direction.
  • a further dewatering of the fibrous web can advantageously also be carried out by means of this pressing device, which can for example consist of two press rollers, between which the conveyor belt, the dewatering belt and the fibrous web arranged in between are passed.
  • the additional pressing device the partial transfer of the remaining fibrous web fluid into the dewatering belt.
  • the dewatering device can be positioned after the bias belt headbox in the running direction, with at least one dewatering element being arranged between the bias belt headbox and the dewatering device.
  • Such a positioning of at least one further dewatering element can advantageously optimize the dewatering performance of the fibrous web-forming device.
  • the fibrous web can be brought to a predefined dry content by such a further dewatering element before it enters the dewatering device.
  • the dewatering device can be positioned after a deflection roller in the running direction in such a way that at least one dewatering element is arranged between the deflection roller and the dewatering device.
  • the deflection roller delimits the section running obliquely to the horizontal in the running direction and in the running direction after the deflection roller the fibrous web can be arranged such that the running direction and the gravitational direction enclose an acute angle ⁇ .
  • Positioning a further, preferably suction-controlled dewatering element in this way can advantageously further dewater the fibrous web and achieve a predetermined dry content of the fibrous web before it enters the dewatering device, for example greater than 14%, in particular greater than 15%.
  • a dewatering element arranged after the deflection roller in the running direction can advantageously prevent detachment of the fibrous web from the conveyor belt when the running direction is oriented at an acute angle to the direction of gravity. In other words, the fibrous web can be prevented from falling off the conveyor belt when the fibrous web is guided upside down on the conveyor belt.
  • the dewatering device in the machine running direction preferably in the running direction directly in front of the transfer point of the fibrous web to one of the fibrous web forming apparatus be positioned downstream drying device in the running direction.
  • the desired and required dry content of the fibrous web for the drying device can advantageously be adjusted directly in front of the transfer point to the drying device by means of the dewatering device.
  • the dewatering device can also be positioned in such a way that the deflection roller is the roller of the dewatering device.
  • the dewatering device can be positioned in such a way that the fibrous web is in contact with the dewatering belt and the transport belt is in contact with the press belt.
  • Such an advantageous positioning of the fibrous web between the conveyor belt and the dewatering belt enables a particularly rapid and sufficiently large transfer of the fibrous web fluid into the dewatering belt when the press belt presses the sandwich of transport belt, fibrous web and dewatering belt against the roller.
  • the dewatering of the fibrous web can be designed particularly effectively.
  • any existing structuring of the conveyor belt can have a further effect on the fibrous web.
  • the conveyor belt can have a structured surface oriented towards the fibrous web for structuring and/or to avoid the pressing of partial areas (protected areas) of the fibrous web.
  • a required structure or profiling and structuring of the fibrous web can be achieved, which is advantageous Having protection areas with an increased accumulation of fibrous web material and a bulky structure, and pressing areas with a pressed structure and an increased structural strength.
  • the finished fibrous web can have a higher air permeability in the protective areas with a simultaneous stronger cleaning effect due to the accumulated fibrous web material.
  • Such a structure of the fibrous web is particularly required for filter media in order to increase the filter effect.
  • the cavities or protective areas of the surface of the structured conveyor belt have a depth of more than 0.5 mm, preferably more than 0.7 mm, in particular more than 1 mm.
  • the conveyor belt can have a structured surface with a pressing area of ⁇ 40%, based on 100% of an imaginary planar reference surface arranged opposite the structured surface. It is also conceivable that the structured surface has a pressing range of 10-30%, possibly 10-25%, in particular 15-25% and for example 15-20%.
  • a desired structural strength of the fibrous web can be achieved with a press area dimensioned in this way, so that the voluminous protective areas are protected and fixed by the enclosing press areas.
  • a desired tear resistance in particular when subjected to pressure, can also be achieved.
  • the conveyor belt can have a structured surface with a protective area of >60%, based on 100% of an imaginary planar reference surface arranged opposite the structured surface. It is also conceivable that the structured surface has a protection range of 70-90%, possibly 75-90%, in particular 75-85% and in particular 80-85%.
  • a high voluminous proportion can be achieved, which has a high air permeability with at the same time excellent absorption capacity.
  • the conveyor belt can have a partial section running obliquely to the horizontal in such a way that the partial section runs at an acute angle of essentially greater than 0° to 45° to the horizontal.
  • An acute angle of 5° to 45° is also advantageous, in particular 10-40°, possibly 10-30°, 15-25° and for example 20+/-3° is conceivable.
  • Such a sloping section allows the fibrous suspension to be optimally applied to the conveyor belt, especially with regard to a multi-layered headbox, so that the individual layers of the fibrous suspension mix only slightly with one another and a multi-layer structure of the fibrous web is possible.
  • the roller of the dewatering device can be designed as a suction roller.
  • the fibrous web fluid can also be at least partially transferred into the dewatering belt by suction using the suction roller in addition to the pressing with the press belt and, if necessary, blowing with the blower hood.
  • the dewatering performance of the dewatering device can be increased further.
  • fibrous web fluid can also be sucked out of the dewatering belt, at least in part.
  • the fluid of the blower hood preferably flows in the following order first through the press belt, through the transport belt, through the fibrous web and through the dewatering belt into the suction roll having a suction zone.
  • the roll can be designed as a suction roll, with a suction zone that partially extends in the circumferential direction, with a suction zone angle determined in the circumferential direction of the roll having a value of between 50° and 270°, in particular between 80° and 200° and for example between 90° and 120°.
  • a suction zone angle determined in the circumferential direction of the roll having a value of between 50° and 270°, in particular between 80° and 200° and for example between 90° and 120°.
  • Blow zone angles can also have a value of 50° to 270°, optionally from 80° to 200°, in particular from 90° to 120°.
  • the suction zone angle is preferably greater than the blow zone angle.
  • the suction zone angle is larger than the corresponding circle sector angle of the blast hood partially surrounding the roll.
  • the suction length of the suction zone extending in the circumferential direction of the roll is greater than 300 mm, preferably greater than 800 mm.
  • the suction length is preferably in the range between 300 mm and 2500 mm.
  • the suction length is 1300mm.
  • the dewatering device can be dimensioned smaller with regard to the vacuum to be generated and the vacuum that can be reduced in this way can also be used in a targeted manner in the suction zone.
  • the dewatering belt is designed as a felt.
  • the high and good absorption capacity of fibrous web fluid from the fibrous web is advantageous when it is designed as a felt.
  • the felt can be at least partially compressed by the press belt, so that when the pressure decreases due to the relaxation of the felt, more fibrous web fluid can pass from the fibrous web into the felt.
  • the dewatering belt can have a dewatering zone defined by wrapping around the roll with a dewatering zone angle of 10° to 270° determined in the circumferential direction of the roll.
  • the dewatering zone angle can also have a value of between 50° and 270°, in particular between 80° and 200° and for example between 90° and 120°.
  • This dewatering zone angle is preferably larger than the circular sector angle of the blast hood partially surrounding the roll and larger than the blast zone angle.
  • the suction zone angle is preferably greater than the drainage zone angle.
  • such a dewatering zone angle allows the dewatering section to be made sufficiently large.
  • the vacuum to be applied to the roller designed as a suction roller can be reduced or the diameter of the roller can be reduced.
  • the press belt can have a belt tension of 10-80 kN/m.
  • the strap tension can also be 15-65 kN/m, possibly 20-60 kN/m, in particular 20-55 kN/m and for example 30-50 kN/m.
  • the desired gentle mechanical pressing of the fibrous web can be achieved with at least partial preservation of the voluminous structure by such a belt tension.
  • the press belt can have a calculated contact pressure on the roller, i.e. a contact pressure determined with the tension of the press belt and the diameter of the roller, of more than 20 kPa. It is also conceivable that the contact pressure is more than 35 kPa, possibly more than 45 kPa, in particular more than 60 kPa and possibly more than 80 kPa.
  • the pressure in the area of the protective areas on the fibrous web is significantly lower and in the area of the pressing areas surrounding the protective areas significantly higher than the calculated contact pressures given above.
  • the voluminous structure of the fibrous web can also be maintained at least partially during the dewatering by the dewatering device by means of such a contact pressure.
  • the press belt can have an open area of at least 25%, based on 100% of an imaginary planar reference surface arranged opposite the press belt.
  • the open area can be at least 50%, optionally at least 70%, in particular at least 75% and for example at least 80%.
  • Such a large open area in particular when using a blower hood, can advantageously allow the fluid acted upon by the blower hood to act on the fibrous web or the conveyor belt, so that the fibrous web fluid increasingly passes into the dewatering belt due to the blowing effect or is at least partially entrained by the fluid flow or is carried away.
  • the press belt can have a pressing surface of at least 10% based on 100% of an imaginary planar reference surface arranged opposite the press belt. It is also conceivable that the pressing surface is a maximum of 50%, possibly a maximum of 30%, in particular a maximum of 25% and for example a maximum of 20%.
  • a sufficient and uniform transmission of the contact pressure built up by the press belt can be transmitted to the conveyor belt, for example, so that the fibrous web can be pressed evenly.
  • the press belt can have a press zone defined by wrapping around the roll with a press zone angle of 10° to 270° determined in the circumferential direction of the roll.
  • the pressure zone angle can also have a value between 50° and 270°, in particular between 80° and 200° and for example between 90° and 120°.
  • the nip angle is preferably less than the dewatering zone angle.
  • the contact pressure with which the press belt presses against the roller can also be achieved by a lower belt tension.
  • the angle is determined from the beginning of the respective zone to the end of the respective zone in the circumferential direction of the roll.
  • the beginning and end of the suction zone are determined by the vacuum that occurs.
  • the beginning and end of the blow zone are specified, for example, by the blow hood.
  • the start and end of the respective zones are determined by the direct or indirect contact of the belt with the roller.
  • the respective zones can be congruent or differ from each other by a maximum of 10% of the respective angle in their position and/or their extent.
  • the press belt can also be designed as the jacket of a shoe press.
  • a further aspect of the invention proposes a machine for producing a fibrous web with a fibrous web-forming device as described above, the machine having at least one drying device following the fibrous web-forming device in the running direction.
  • the final drying of the fibrous web can be carried out by means of a drying device following the fibrous web formation device in the running direction, so that after the drying device the fibrous web can be transported and further processed without significant deterioration.
  • the machine can have a press roller assigned to the fibrous web forming device, with which the fibrous web is transferred to the drying device at a transfer point, the press roller, which is preferably designed as a suction pressure roller or as a roller with a closed surface, with a linear force of 60 up to 120kN/m, in particular with 70 to 90kN/m.
  • such a contact pressure can largely prevent a disadvantageous effect on the voluminous portions of the fibrous web and, in addition, the fibrous web can be reliably transferred into the drying device by means of the contact pressure.
  • the machine can have a Yankee cylinder assigned to the drying device, it being possible for a blast hood to be provided which partially surrounds the Yankee cylinder in the circumferential direction.
  • a Yankee cylinder is a drying cylinder with a minimum diameter of 3 m.
  • the minimum diameter can also be 3.6 m and for example at least 4.5 m.
  • the machine can have a TAD system.
  • the fibrous web can be further dewatered or dried by additional drying using a TAD system.
  • the machine can have a drying cylinder arrangement associated with the drying device, comprising at least one drying cylinder.
  • such an alternative drying method can also be used to dry the fibrous web by means of a conventional drying cylinder arrangement.
  • the machine can have a take-off roller assigned to the drying device, which can be designed as a suction roller and with which the fibrous web is taken over into the drying device at the transfer point.
  • Such a suction roller or pick-up roller can advantageously be used to reliably transfer the fibrous web from the fibrous web-forming device to the drying device.
  • a further aspect of the invention proposes the use of a dewatering device as described above in a machine for producing a fibrous web having at least one bias belt former, the dry content of the fibrous web being increased by the dewatering device to a value of 14-60%. It is also conceivable that the dry matter content is increased to 25-55%, if necessary to 30-50%, in particular to 30-45% and for example to 35-45%.
  • Such a dewatering device can advantageously bring the fibrous web to a dry content inside the fibrous web forming device that enables sufficient and desired drying within the drying device, so that the fibrous web is ready for further processing after the drying device.
  • a fibrous web forming device 100 as in 1 includes a bias web headbox 110 and a bias tape former 120.
  • FIG. a dewatering device 130 is provided, with the aid of which the at least partial dewatering of a fibrous web 140 applied with the bias belt headbox 110 can be carried out in the fibrous web forming device 100 .
  • the bias tape former 120 has a conveyor belt 150 that is guided over a plurality of guide rollers 160, 160'.
  • the conveyor belt 150 also has a partial section 170 that runs obliquely to the horizontal and in which the bias-belt headbox 110 is arranged.
  • a partial section 170 standing or running obliquely to the horizontal 172 is to be understood as meaning that section of the conveyor belt 150 which is arranged at an angle ⁇ to the horizontal 172 in such a way that it rises in the running direction 180 of the fibrous web 140 .
  • At least one dewatering element 190 can be arranged on the conveyor belt 150 opposite the bias belt headbox 110 .
  • Pulp suspension dewatered and on the other favors the formation of the fibrous web 140 from the fibrous suspension.
  • the section 170 is delimited by a deflection roller 200 in the running direction 180 .
  • the conveyor belt 150 can be arranged in such a way that the running direction encloses an acute angle ⁇ with the gravitational direction 202.
  • the fibrous web 140 hangs at least partially upside down on the conveyor belt 150 and is no longer supported or carried by the same. Consequently, the fibrous web 140 can detach from the transport web 150 in this area.
  • At least one dewatering element 210 can be arranged in the area described above. However, it is conceivable for further dewatering elements 210, 210" to be arranged between the deflection roller 200 and the dewatering device 130. These in turn can serve to dewater the fibrous web 140 and at the same time prevent the fibrous web 140 from becoming detached from the conveyor belt 150.
  • the dewatering device 130 has a roller 220 , a dewatering belt 230 and a press belt 240 .
  • the conveyor belt 150 is arranged between the press belt 240 and the dewatering belt 230 .
  • the sandwich made up of conveyor belt 150 , fibrous web 140 and dewatering belt 230 is pressed against roller 220 by press belt 240 .
  • the fibrous web 140 is arranged between the conveyor belt and the dewatering belt 230 .
  • Such a press belt 240 can be used for gentle dewatering by means of the dewatering belt 230, the pressure built up by the press belt 240 being dimensioned such that the fibrous web can be dewatered while at least partially maintaining a voluminous structure.
  • the roller 220 can be designed as a suction roller, which can also have a suction zone 250 . It can be advantageous here if a suction zone angle 260 approximately corresponds to a dewatering zone angle and a pressure zone angle 280 . According to 1 the suction zone angle 260 corresponds to the dewatering zone angle 270 and the pressure zone angle 280.
  • a blast hood 290 can be provided, with which a blast zone 300 of the roller 220 can be subjected to a fluid such as air, steam, superheated steam or the like.
  • a blow zone angle 310 determined in the circumferential direction of the roll can correspond approximately to the other angles 270, 280, 260. According to 1 the blast zone angle 310 is approximately the same size as the previously mentioned angles 260, 270, 280.
  • the dewatering belt 230 is guided endlessly over a number of guide rollers 320 .
  • a dewatering element 340 or a plurality of dewatering elements 340, 340′ can be arranged within a guide loop 330 spanned by the dewatering belt 230, so that the fibrous web fluid withdrawn from the fibrous web 140 can be withdrawn from the system of the dewatering belt 230.
  • the dewatering belt 230 is designed as a felt.
  • a pressing device 350 which has two pressing rollers 360, 360', can be arranged downstream of the dewatering device 130 in the running direction 180.
  • the conveyor belt 150 and the dewatering belt 230 can be guided through this pressing device 350 .
  • the fibrous web 140 can again be arranged between the dewatering belt 230 and the conveyor belt 150 .
  • a further dewatering of the fibrous web 140 is possible by means of this pressing device 350 . In this way, a transfer of the fibrous web fluid into the dewatering belt 230 can be favored by means of the pressing pressure built up by the pressing device 350 .
  • a drying device 370 can be arranged downstream of the fibrous web formation device in the running direction 180 .
  • the drying device 370 can have a Yankee cylinder 380, for example.
  • This Yankee cylinder 380 can be at least partially replaced by an in 1 be surrounded by a blow hood, not shown, with which the drying of the fibrous web 140 can be additionally forced.
  • the fibrous web 140 can be transferred from the conveyor belt 150 into the drying device 370, for example by means of a press roller 400.
  • the conveyor belt 150 is configured in a structured manner so that it has a number of protection areas 410 and a number of pressing areas 420 .
  • the protection areas 410 remains the Fibrous web 140 largely uncompressed, so that voluminous structures can form in the protective areas 410, while the fibrous web 140 is compressed in the pressing areas 420, so that the pressing areas essentially contribute to the structural stability of the fibrous web 140.
  • the dewatering belt 230 abuts the roller 220 .
  • the fibrous web 140 is arranged between the dewatering belt 230 and the transport belt 150 and the sandwich of transport belt 150 fibrous web 140 and dewatering belt 230 is pressed against the roller 220 by the press belt 240 .
  • fibrous web material can increasingly accumulate in the protective areas 410, in particular during the application of the fibrous stock suspension by means of the bias belt headbox, which is also largely opposite to the pressing by means of the press belt 240, and possibly also by means of the press roller 400, while at least partially maintaining the voluminous structure is protected.
  • the fibrous web 140 since the fibrous web 140 is applied directly to the conveyor belt 150 by the bias belt headbox 110, and the protective areas are thus increasingly filled with fibrous web material, the fibrous web 140 does not pull apart in the protective areas 410, as is the case with the TAD, for example - Procedure can occur.
  • the fibrous web In the TAD process, the fibrous web is transferred from a largely planar conveyor belt to a structured belt during TAD drying. Due to this transfer of the essentially planar fibrous web to a structured belt, the fibrous web is pulled apart, especially in the cavities of the structured belt, so that although a voluminous structure can be maintained in the cavities, the fibrous web material is thinned out because now more surface has to be covered with the planar fibrous web.
  • the method according to the invention has an accumulation of the fibrous web material precisely in the protected areas 410, so that the use of fibrous webs 140 produced in this way is advantageous, for example as filter media.

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (9)

  1. Dispositif de formation de bande de matière fibreuse comprenant un moyen de formation à bande oblique (120), une caisse de tête à bande oblique (110) et un dispositif d'élimination d'eau (130),
    le moyen de formation à bande oblique (120) présentant au moins une bande de transport (150) transportant la bande de matière fibreuse (140) dans sa direction d'avance (180), laquelle bande de transport est dotée d'une section partielle (170) s'étendant de manière oblique par rapport à l'horizontale (172), section partielle dans laquelle est disposée la caisse de tête à bande oblique (110), au moyen de laquelle une suspension de matière fibreuse peut être appliquée sur la bande de transport (150),
    le dispositif d'élimination d'eau (130) présentant un cylindre (220), une bande d'élimination d'eau (230) s'appuyant contre le cylindre (220) et une bande de pressage (240) pressant contre le cylindre (220),
    la bande d'élimination d'eau (230) étant réalisée sous forme de feutre et étant guidée sans fin par le biais de plusieurs cylindres de guidage (320), et
    la bande de matière fibreuse (140) étant disposée dans la région du dispositif d'élimination d'eau (130) entre la bande d'élimination d'eau (230) et la bande de pressage (240),
    caractérisé en ce que
    la bande de transport (150) est disposée dans la région du dispositif d'élimination d'eau (130) en sandwich entre la bande d'élimination d'eau (230) et la bande de pressage (240), la bande de matière fibreuse (140) demeurant sur la bande de transport (150) pendant le passage à travers le dispositif d'élimination d'eau (130) .
  2. Dispositif de formation de bande de matière fibreuse selon l'une des revendications précédentes,
    le dispositif d'élimination d'eau (130) présentant au moins un autre composant parmi le groupe suivant :
    un capot de soufflage (290) entourant partiellement le cylindre (220) dans la direction circonférentielle et servant à soumettre au moins une zone de soufflage (300), entourée par le capot de soufflage (290), du cylindre (220) à l'action d'un fluide, un angle de zone de soufflage (310) déterminé dans la direction circonférentielle du cylindre adoptant une valeur de 10° à 270°,
    un dispositif de pressage (350) supplémentaire, disposé après le cylindre (220) dans la direction d'avance (180).
  3. Dispositif de formation de bande de matière fibreuse selon l'une des revendications précédentes,
    le dispositif d'élimination d'eau (130) présentant au moins une caractéristique parmi le groupe suivant :
    un positionnement du dispositif d'élimination d'eau (130) après la caisse de tête à bande oblique (110) dans la direction d'avance (180), au moins un élément d'élimination d'eau (190) étant disposé entre la caisse de tête à bande oblique (110) et le dispositif d'élimination d'eau (130),
    un positionnement du dispositif d'élimination d'eau (130) après un cylindre de renvoi (200) dans la direction d'avance (180), lequel cylindre de renvoi limite, dans la direction d'avance (180), la section partielle (170) s'étendant de manière oblique par rapport à l'horizontale (172), la bande de matière fibreuse (140) étant disposée après le cylindre de renvoi (200) dans la direction d'avance (180), de telle sorte que la direction d'avance (180) et la direction de la gravité (202) forment un angle aigu (α), au moins un élément d'élimination d'eau (210, 210', 210") pouvant être disposé entre le cylindre de renvoi (200) et le dispositif d'élimination d'eau (130),
    un positionnement du dispositif d'élimination d'eau (130), de telle sorte que le cylindre de renvoi (200) soit le cylindre (220) du dispositif d'élimination d'eau (130),
    un positionnement du dispositif d'élimination d'eau (130), de telle sorte que la bande de matière fibreuse (140) s'appuie contre la bande d'élimination d'eau (230) et la bande de transport (150) contre la bande de pressage (240) .
  4. Dispositif de formation de bande de matière fibreuse selon l'une des revendications précédentes,
    la bande de transport (150) présentant au moins une caractéristique parmi le groupe suivant :
    une surface structurée, orientée vers la bande de matière fibreuse (140), laquelle surface présente des cavités et des rehaussements, les cavités formant des régions de protection (410) et les rehaussements formant des régions de pressage (420),
    une surface structurée, orientée vers la bande de matière fibreuse (140), laquelle surface présente des cavités et des rehaussements, les cavités formant des régions de protection (410) et les rehaussements formant des régions de pressage (420), avec une région de protection (410) de plus de 60%, par rapport à 100% d'une surface de référence plane imaginaire disposée vis-à-vis de la surface structurée,
    une surface structurée, orientée vers la bande de matière fibreuse (140), laquelle surface présente des cavités et des rehaussements, les cavités formant des régions de protection (410) et les rehaussements formant des régions de pressage (420), avec une région de pressage (420) de moins de 40%, par rapport à 100% d'une surface de référence plane imaginaire disposée vis-à-vis de la surface structurée,
    une section partielle (170) s'étendant de manière oblique par rapport à l'horizontale (172), de telle sorte que la section partielle (170) s'étende par rapport à l'horizontale (172) suivant un angle aigu (β) sensiblement de plus de 0° à 45°.
  5. Dispositif de formation de bande de matière fibreuse selon l'une des revendications précédentes,
    le cylindre (220) du dispositif d'élimination d'eau (130) présentant au moins une caractéristique parmi le groupe suivant :
    une configuration sous forme de cylindre aspirant,
    une configuration sous forme de cylindre aspirant doté d'une zone d'aspiration (250) s'étendant partiellement dans la direction circonférentielle, un angle de zone d'aspiration (260) déterminé dans la direction circonférentielle du cylindre adoptant une valeur de 10° à 270°.
  6. Dispositif de formation de bande de matière fibreuse selon l'une des revendications précédentes,
    la bande d'élimination d'eau (230) présentant une zone d'élimination d'eau définie par un enroulement autour du cylindre, laquelle zone présente un angle de zone d'élimination d'eau (270), déterminé dans la direction circonférentielle du cylindre, de 10° à 270°.
  7. Dispositif de formation de bande de matière fibreuse selon l'une des revendications précédentes,
    la bande de pressage (240) présentant au moins une caractéristique parmi le groupe suivant :
    une tension de bande de 10-80 kN/m,
    une pression d'appui sur le cylindre (220) de plus de 20 kPa,
    une surface ouverte d'au moins 25%, par rapport à 100% d'une surface de référence plane imaginaire disposée vis-à-vis de la bande de pressage (240),
    une surface de pressage d'au moins 10%, par rapport à 100% d'une surface de référence plane imaginaire disposée vis-à-vis de la bande de pressage (240),
    une zone de pressage définie par un enroulement autour du cylindre (220), laquelle zone présente un angle de zone de pressage (280), déterminé dans la direction circonférentielle du cylindre, de 10° à 270°,
    une configuration sous forme d'enveloppe d'une presse à sabot.
  8. Machine permettant de fabriquer une bande de matière fibreuse (140) comprenant un dispositif de formation de bande de matière fibreuse (100) selon l'une des revendications 1 à 7,
    la machine présentant au moins un dispositif parmi le groupe suivant :
    un dispositif de séchage (370) suivant le dispositif de formation de bande de matière fibreuse (100) dans la direction d'avance,
    un dispositif de séchage (370) suivant le dispositif de formation de bande de matière fibreuse (100) dans la direction d'avance ainsi qu'un cylindre de pressage (400) associé au dispositif de formation de bande de matière fibreuse (100), cylindre de pressage à l'aide duquel la bande de matière fibreuse (140) est transmise au dispositif de séchage (370) au point de transfert (390), le cylindre de pressage (400) étant pressé avec une force linéaire de 60 à 120 kN/m,
    un dispositif de séchage (370) suivant le dispositif de formation de bande de matière fibreuse (100) dans la direction d'avance ainsi qu'un cylindre yankee (380) associé au dispositif de séchage (370),
    un dispositif de séchage (370) suivant le dispositif de formation de bande de matière fibreuse (100) dans la direction d'avance ainsi qu'un cylindre yankee (380) associé au dispositif de séchage (370) ainsi qu'un capot de soufflage entourant partiellement le cylindre yankee (380) dans la direction circonférentielle,
    un système TAD (séchage par air traversant),
    un dispositif de séchage (370) suivant le dispositif de formation de bande de matière fibreuse (100) dans la direction d'avance ainsi qu'un ensemble de cylindres de séchage associé au dispositif de séchage (370), lequel ensemble comprend au moins un cylindre de séchage,
    un dispositif de séchage (370) suivant le dispositif de formation de bande de matière fibreuse (100) dans la direction d'avance ainsi qu'un cylindre d'enlèvement associé au dispositif de séchage (370), lequel cylindre d'enlèvement peut être réalisé sous forme de cylindre aspirant et à l'aide duquel la bande de matière fibreuse (140) est reprise dans le dispositif de séchage (370) en un point de transfert (390).
  9. Utilisation d'un dispositif de formation de bande de matière fibreuse selon l'une des revendications 1 à 7 dans une machine, présentant au moins un moyen de formation à bande oblique (120), permettant de fabriquer une bande de matière fibreuse (140), la teneur en matière sèche de la bande de matière fibreuse (140) étant augmentée à une valeur de 14-60% au moyen du dispositif d'élimination d'eau (130).
EP13745132.4A 2012-08-06 2013-08-06 Machine permettant de fabriquer une bande de matière fibreuse au moyen d'un dispositif de formation à bande oblique et d'un dispositif d'élimination d'eau Active EP2880216B1 (fr)

Applications Claiming Priority (2)

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DE102012213873 2012-08-06
PCT/EP2013/066476 WO2014023728A1 (fr) 2012-08-06 2013-08-06 Machine permettant de fabriquer une bande de matière fibreuse au moyen d'un dispositif de formation à bande oblique et d'un dispositif d'élimination d'eau

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EP2880216A1 EP2880216A1 (fr) 2015-06-10
EP2880216B1 true EP2880216B1 (fr) 2023-06-21

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WO2015000687A1 (fr) * 2013-07-04 2015-01-08 Voith Patent Gmbh Procédé de conversion et de fonctionnement d'un dispositif de fabrication de non-tissé
WO2015000690A1 (fr) * 2013-07-04 2015-01-08 Voith Patent Gmbh Procédé et dispositif compact de fabrication de non-tissé
DE102015001008A1 (de) 2015-01-28 2016-07-28 Andritz Küsters Gmbh Verfahren und Vorrichtung zur Herstellung von nassgelegten Vliesstoffen
DE102015005384A1 (de) 2015-04-28 2016-11-03 Andritz Küsters Gmbh Verfahren und Vorrichtung zur Herstellung von nassgelegten Vliesstoffen
CN105839448A (zh) * 2015-11-04 2016-08-10 山东太阳生活用纸有限公司 造纸机、纸巾制造方法及纸巾
CN106988150B (zh) * 2017-05-23 2019-06-25 东莞市白天鹅纸业有限公司 一种生活用纸造纸机
DE102018107944B3 (de) * 2018-04-04 2019-06-19 Delfortgroup Ag Verbessertes filterpapier, herstellungsverfahren und daraus gefertigter beutel
DE102019116197A1 (de) * 2019-06-14 2020-12-17 Voith Patent Gmbh Verschmutzungsmessung Saugwalze

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US1599385A (en) * 1922-10-11 1926-09-07 Goodyear Tire & Rubber Machine for making fiber composition
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CA2554365C (fr) * 2004-01-30 2013-07-23 Thomas Thoroe Scherb Systeme de deshydratation avance
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US20150152599A1 (en) 2015-06-04
CN104520504A (zh) 2015-04-15
EP2880216A1 (fr) 2015-06-10

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