EP3622112A1 - Dispositif et procédé de fabrication d'une bande de matière fibreuse - Google Patents

Dispositif et procédé de fabrication d'une bande de matière fibreuse

Info

Publication number
EP3622112A1
EP3622112A1 EP18717357.0A EP18717357A EP3622112A1 EP 3622112 A1 EP3622112 A1 EP 3622112A1 EP 18717357 A EP18717357 A EP 18717357A EP 3622112 A1 EP3622112 A1 EP 3622112A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
suction
press
transfer
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18717357.0A
Other languages
German (de)
English (en)
Inventor
Johann Moser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
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
Priority claimed from DE102017110032.6A external-priority patent/DE102017110032A1/de
Priority claimed from DE102017111869.1A external-priority patent/DE102017111869A1/de
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP3622112A1 publication Critical patent/EP3622112A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of 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
    • D21F11/02—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
    • D21F2/00—Transferring continuous webs from wet ends to press sections
    • 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

Definitions

  • the invention relates to a device for producing a multilayer fibrous web, comprising a wire section for forming the multilayer fibrous web, a press section for further dewatering the multilayer fibrous web and a dryer section for drying the multilayer fibrous web, wherein the wire section a first air-permeable forming belt, which is used to form a first Layer of the multi-ply fibrous web is set up comprises and which leads the formed multi-ply fibrous web to a take-off point with a pick-up device, the pick-up a Abdgingsaugelement and a further encompassing this further band comprises and the multi-layer fibrous web is removed by the removal device at the take-off point of the first air-permeable Formierband and the press section comprises at least three press nips, wherein the last two press nips by a third pressing member and a second pressing member and a common counter element with smooth surface for smoothing the first air-permeable Formierband in direct contact side of the first layer of the multilayer fibrous web, are
  • the invention also relates to a method for producing a multilayer fibrous web.
  • Devices of this type are known from the prior art.
  • the document DE102014210879 A1 describes a paper machine and a method for the production of packaging papers.
  • a multi-layer packaging paper web consisting of a cover, a protective layer and a supine position, is produced in a wire section with two forming units and in a press section, consisting of a compact press with 3 press nips, further dehydrated and then fed to a dryer section and further process steps.
  • the supine is puffed onto the coverage and dewatered through the coverage. This leads to a graying of the usually bright coverage.
  • the document DE 1 1 2009002741T5 likewise discloses a machine for producing a multilayer board web, for example a white top liner with a cover layer and a backsheet.
  • the individual layers are formed in the wire section, interconnected, dewatered and transferred with a press felt in the press section, which can be designed as a compact press with three press nips.
  • the wire section consists of two forming units for producing a cover and a supine position with subsequent Vergautschung to a board web. This is then transferred by a press belt in the press section and further dehydrated. This consists of a compact press with three press nips. This is followed by a drying section and further process sections. In the wire section, the supine is puffed onto the coverage and dewatered through the coverage. This leads, as already stated, to a graying of the usually bright coverage.
  • the known devices either have the disadvantage of graying the high-quality bright coverage, which leads to an impairment, or the paper machine configurations are very complex and expensive.
  • the cover layer is arranged in the wire section at the top in order to avoid dewatering of the supine position by the cover layer.
  • this requires a complex press-in configuration in the form of an inverted compact press with poor runnability or an additional fourth press to smooth the surface of the coverage.
  • the object of the invention is therefore to propose an apparatus for producing a multilayer fibrous web, for example a white top liner or white top test liner, which on the one hand ensures good runnability of the fibrous web in the paper machine and, on the other hand, the deterioration in quality, such as graying and low Smoothness counteracts the higher-grade position of the multilayer fibrous web, for example the light coverage.
  • a white top liner or white top test liner which on the one hand ensures good runnability of the fibrous web in the paper machine and, on the other hand, the deterioration in quality, such as graying and low Smoothness counteracts the higher-grade position of the multilayer fibrous web, for example the light coverage.
  • the invention relates to a device for producing a multilayer fibrous web for a paper machine, comprising a wire section for forming the multilayer fibrous web, a press section for further dewatering the multilayer fibrous web and a dryer section for drying the multilayer fibrous web, the wire section comprising a first air-permeable forming belt, which is arranged to form a first layer of the multi-ply fibrous web, and which guides the formed multi-ply fibrous web to a take-off point with a take-off device, the take-off device comprising a take-off suction element and a further belt wrapping around it and the multi-ply fibrous web being passed through the take-off device at the take-off point of first air-permeable forming belt is removed and the press section comprises at least three press nips, wherein the last two press nips by a third pressing member and a second pressing member and egg nem common counter-element with a smooth surface for smoothing the first air-per
  • the first press nip is double-felted and has an upper felt and a lower felt and that the further band is designed as an air-permeable transfer belt and forms a transfer zone from the take-off point to a transfer point of the fibrous web to the lower felt of the first press nip extends.
  • This device has the advantage that the first layer of the multilayer fibrous web formed on the first forming belt is dewatered in combination with a simple press configuration, and the side facing the first forming belt is smoothed in the press.
  • the double-felted first press nip increases the dewatering capacity of the press section.
  • This arrangement is advantageously suitable for the production of white top liners or white top test liners.
  • These types of boxes and packaging papers include a higher-quality, lighter-colored coverage and a darker, usually brown supine.
  • additional layers may be provided between these layers.
  • a protective layer and a deposit are common.
  • the present invention is thus particularly advantageously applicable to the production of white top liners or white top test liners, wherein the first layer is formed by the coverage.
  • a transfer suction element preferably a suction box, with at least one suction zone in the region of the transfer zone is arranged in the loop formed by the transfer belt.
  • the multi-ply fibrous web is further dewatered through the at least one suction zone, the dewatering direction now extending in the opposite direction to the dewatering direction on the first forming belt.
  • This type of further drainage makes it possible to reduce dewatering on the first forming belt, for example by lower dewatering pressures, without increasing the dry content of the multi-ply fibrous web at the entrance to the press section Reduce. A graying of the first layer is thus counteracted.
  • the marking of the side to be smoothed of the first layer of the multilayer fibrous web also decreases through the forming belt. An improvement in the smoothness of the first layer is achieved.
  • the transfer suction on at least two, preferably at least three, suction zones in the direction of manufacture This allows the drainage process to be adjusted.
  • the negative pressure in the at least one suction zone can be set to a value of more than 20 kPa, in particular more than 30 kPa, preferably more than 40 kPa.
  • the transfer suction element has at least two suction zones in the production direction and wherein the negative pressure in the suction zones can be increased in the direction of production.
  • the transfer suction element prefferably has a water-permeable ceramic coating facing the transfer belt.
  • the ceramic covering comprises strips and slots and wherein the width of the slots in the direction of manufacture is preferably greater than 10 mm.
  • the slots between the strips extend over the entire width of the transfer suction.
  • the slots are interrupted transversely to the direction of manufacture by webs.
  • the ceramic covering is at least partially perforated.
  • the ceramic coating may also include a combination of ledges and slots and perforations.
  • the perforations can be designed as holes.
  • the relative open area of the ceramic coating is preferably greater than 50%.
  • the Abzugsesaugelement is designed as a suction roll or as a tube suction or as a flat vacuum.
  • a suction roll is particularly suitable.
  • the decrease suction element is preferably operable with a negative pressure of more than 20 kPa, in particular more than 30 kPa, preferably more than 40 kPa.
  • the Abzugsesaugelement is designed as a suction roller with two successively arranged in the direction of manufacture suction zones.
  • the first suction zone is designed as a decrease suction zone and the second suction zone is designed as a holding zone in such a way that negative pressures of more than 20 kPa, in particular more than 30 kPa, can be applied. It is particularly advantageous if the intake suction is carried out so that the negative pressure of the second suction zone, that is, the holding zone, higher than the negative pressure of the first suction zone, ie the take-off zone is.
  • the decrease suction element thus differs from known Abticiansaugelementen in which the negative pressure of the second suction zone, that is, the holding zone, smaller than the negative pressure of the first suction zone, ie the take-off zone, is.
  • the transfer suction follows, wherein the multi-layer fibrous web is held by the negative pressure of the at least one suction zone of the transfer suction on the transfer belt.
  • the Abzugsesaugelement is designed as a suction roller and the suction roller is assigned a groove functionally, which is preferably integrated into the suction element of the transfer suction.
  • the gutter absorbs the water thrown off by the suction roll.
  • the water is discharged laterally transversely to the production direction, preferably together with the water of the at least one suction zone of the transfer suction element.
  • the air permeability of the transfer belt is greater, in particular at least twice as large, as the air permeability of the first Formierbandes. This achieves a high dry content of the multilayer fibrous web and at the same time stabilizes the drainage.
  • a steam blowing device for direct loading of the multilayer fibrous web with steam is arranged.
  • the steam blower extends over the entire width of the fibrous web.
  • a steam blowing device for direct loading of the multilayer fibrous web with steam is arranged.
  • the steam blower extends over the entire width of the fibrous web.
  • the Formierband is designed as a mesh or as an air-permeable membrane.
  • the Formierband is designed as a woven Formiersieb or perforated air-permeable membrane.
  • the transfer belt can be designed as a sieve cloth or as an air-permeable membrane or as a spiral sieve.
  • the transfer belt is designed as a woven forming fabric or as a perforated air-permeable membrane.
  • the underfelt may be assigned to stabilize the web run between the transfer point and the first press nip on the side facing away from the fibrous web a web stabilizer.
  • the transfer belt is free of a press nip.
  • press nip is meant, for example, a press nip formed by two rolls. Due to the fact that the transfer belt together with the multilayer fibrous web is not guided by a press nip, marking or structuring of the side to be smoothed is avoided.
  • the wire section comprises at least a first forming unit with the first forming belt for forming the first layer of the multi-ply fibrous web and at least one second forming unit for forming a second layer of the multilayer fibrous web and a Vergautschungszone.
  • the forming units are arranged and configured with respect to one another in such a way that the second layer of the multilayer fibrous web onto which the first layer of the multilayer fibrous web in the lining zone is formed to form the multilayer fibrous web.
  • substantially no dehydration takes place in the region from the glazing zone to the take-off point of the fibrous web.
  • This area is preferably free of drainage elements for dewatering the fibrous web in the direction of the first forming belt.
  • suctioned devices may be provided on the side of the first forming belt opposite the fibrous web only for the purpose of stabilizing the web run.
  • the multi-ply fibrous web white covered liner in particular white top testliner with a cover and a supine position and the wire section be set up such that the cover layer forms the first layer of the multi-ply fibrous web.
  • the wire section may additionally comprise forming units for forming further layers, such as a protective layer or an insert.
  • the multilayer headbox brings two layers consisting of different pulp suspensions on the appropriate Formierband.
  • the common counter element of the second and the third press nip is designed as a smooth-surfaced roll for smoothing the underside of the first layer of the fibrous web.
  • the common counter element of the second and the third press nip is designed as a roller with a smoothly smoothing surface, preferably impermeable to air, for smoothing the underside of the first layer of the fibrous web.
  • the course of the air-permeable transfer belt may preferably be selected such that the direction of the transfer zone, that is to say the running direction of the transfer belt in the region of the transfer zone, lies substantially between an imaginary horizontal line, that is to say the production direction, and an imaginary vertical line. It is also conceivable to select the direction of the transfer zone such that the running direction of the transfer belt in the region of the transfer zone has a direction component counter to the direction of production.
  • the transfer belt runs in the transfer zone after the Ab Spotifysaugelement at an angle between 0 ° to 120 °, in particular between 20 ° to 120 ° inclined to the direction of manufacture. That is, the transfer zone is oriented at an angle of 0 ° to 120 °.
  • Particularly advantageous is a possible orientation of the transfer zone in an angular range between 40 ° to 90 °.
  • the removal of, by the taking place in the transfer zone dewatering of the multilayer fibrous web, resulting white water is improved and facilitated.
  • the dewatered white water is dissipated by its kinetic energy.
  • no vacuum support is required for the removal.
  • the white water can flow out of the separate transfer suction without the use of additional energy.
  • Advantageous is a possible orientation of the transfer zone in an angular range between 80 ° to 120 °, in particular between 90 ° and 120 °.
  • the inclined arrangement of the transfer zone to the production direction can be counteracted by a possible uncontrolled rewetting of the multilayer fibrous web.
  • the transfer suction element can be formed by a plurality of separate transfer suction elements, which can be designed, for example, in each case as a suction box. For example, two to four Saughimsten be arranged in the transfer zone in succession.
  • the sides of the separate transfer suction elements facing the transfer belt can be provided with an open, water-permeable ceramic covering.
  • the separate transfer suction can be sucked each to increase the drainage, wherein the respective negative pressure in the separate transfer suction adjustable, preferably independently adjustable.
  • the plurality of separate transfer suction elements each have a collecting channel for collecting and removing the white water.
  • the collecting channel extends transversely to the direction of manufacture and may have one or more connections for discharging the white water.
  • the negative pressure in at least one of the several separate transfer suction is adjustable to a value of more than 20 kPa, in particular more than 30kPa, preferably more than 40kPa.
  • the negative pressure in the several separate transfer suction in the direction of the transfer belt is increasing.
  • the removal point is located on a lying below the loop formed by the first forming belt horizontal plane.
  • the object is also solved by the features of claim 23.
  • a method for producing a multi-ply fibrous web which is formed in a wire section, further dewatered in a press section and dried in a dryer section, wherein in the wire section a first layer of the multilayer fibrous web is formed on a first air-permeable forming belt and the formed multilayer Fibrous web is passed through the first air-permeable Formierband to a delivery point with a pickup device, wherein the removal device comprises a Abdgingsaugelement and a further band wrapped around this and the multi-layer fibrous web is removed by the removal device at the pickup point of the first air-permeable Formierband by the other band and the press section is performed with at least three press nips, wherein the last two press nips are formed by a third pressing member and a second pressing member and a common counter-element with a smooth surface and wherein the side of the first ply of the multi-ply fibrous web which is in direct contact with the first air permeable forming belt is brought into direct contact with
  • the method is characterized in that the first press nip is double-felted and has an upper felt and a lower felt and that the further band is designed as an air-permeable transfer belt and that transfer the multi-ply fibrous web at a transfer point from the transfer belt to the lower felt of the first press nip becomes.
  • the invention also expressly extends to such embodiments which are not characterized by feature combinations of explicit back references of Claims are given, whereby the disclosed features of the invention - as far as is technically feasible - can be combined with each other.
  • Figure 1 shows an embodiment of a device according to the invention with a
  • Figure 2 shows an embodiment of a device according to the invention with an exemplary Siebpartieaus entry simplified representation
  • Figure 2a shows a variant of the press section of the device according to the invention in a simplified representation
  • Figure 3 shows a second variant of a Siebpartieaus entry the invention
  • FIG. 3a a third variant of a Siebpartieaus exchange the invention
  • Figure 3b shows another variant of a Siebpartieaus
  • Figure 4 shows a detail with a further embodiment of the
  • FIG. 5 shows a detail with a further embodiment of the device according to the invention with a lowered collection point in a simplified representation
  • FIG. 1 shows an embodiment of an inventive device 1 for producing a multilayer fibrous web 2 for a paper machine, with a wire section 3 for forming the multilayer fibrous web 2, with a press section 1 1 for further dewatering of the multilayer fibrous web 2 and with a drying section 37 for drying the multi-layer fibrous web 2 shown.
  • an air-permeable transfer belt 10 for guiding the multi-layer fibrous web 2 of the wire section 3 to the press section 1 1 is arranged.
  • the transfer zone 22 is aligned substantially horizontally. That is, the course of the transfer belt 10 in the region of the transfer zone 22 after the take-off suction 9 is carried out horizontally.
  • the wire section 3 has a first air-permeable forming belt 4, which is set up to form a first layer of the multi-ply fibrous web 2.
  • a removal device 8 which is formed by the transfer belt 10 and a Ab fortunesaugelement 9, the multi-layer fibrous web 2, that is, the first layer with at least one further layer, removed from the first Formierband 4 at a take-off point 7 and thereby on the transfer belt 10th
  • the first forming belt 4 is guided over a wire deflection roller 34 before the removal point 7.
  • the transfer belt 10 wraps around the removal suction element 9, which in this example is designed as a suction roller 9
  • the first forming belt 4 runs back to the take-off point 7 via a deflection roller 35 and via guide rollers 39.
  • the guide rollers 39 are arranged on a zig-zag-shaped line around a substantially horizontally oriented line, so that the first forming belt is returned substantially horizontally
  • Transfer belt 10 extends to form a transfer zone 22 from the take-off point 7 to a transfer point 23 at which the fibrous web 2 is transferred to the lower felt 21 of the first press nip 12.
  • the transfer points are thus carried out without free train.
  • a suction box 24 is used as a transfer suction 24 in this example.
  • the suction box 24 has three suction zones 25, 26, 27 and is arranged in the region of the transfer zone 22.
  • the negative pressure in the suction zones is more than 20kPa.
  • the vacuum supply and / or the suction box 24 are designed such that the negative pressure is rising from suction zone to suction zone adjustable.
  • the first suction zone 25 can have a negative pressure of more than 20 kPa
  • the second suction zone 26 a negative pressure of more than 30 kPa
  • the third suction zone 27 a negative pressure of more than 40 kPa.
  • the transfer suction element 24 seen in the direction of manufacture, upstream of the first suction zone 25, there is arranged a groove 28 assigned to the suction roll 9 for discharging the thrown off white water and preferably integrated in the transfer suction element.
  • the transfer suction element 24 has a water-permeable ceramic coating facing the transfer belt 10. Of the Ceramic covering is made with strips and with intermediate slots with a slot width of 12 mm.
  • the press section 1 1 consists of three press nips 12, 13, 14, wherein the two last press nips 13, 14 by a third pressing member 17 and a second pressing member 16 and a common counter element 18 with a smooth surface for smoothing the first air-permeable forming belt 4 in directly contacting side of the first layer 2a of the multi-ply fibrous web 2, are formed and the first press nip 12 by the second pressing member 16 of the second press nip 13 and a first pressing member 15 is formed.
  • the third pressing element 17 of the third press nip 14 is designed as a shoe roll for forming an extended press nip. However, it is also conceivable to provide a press nip formed by two press rolls at this point.
  • the common counter element 18 is designed as a roller with a smooth cover or a smooth coating.
  • the first press nip 12 is double-felted and has a top felt 20 and a bottom felt 21 on.
  • the second pressing member 16 is designed as a suction press roll and favors both the drainage of the multilayer fibrous web 2, as well as their runnability, that is, the running behavior of the fibrous web 2.
  • the fibrous web 2 After passing through the three press nips 12, 13, 14, the fibrous web 2 passes through a free train to Dry sieve of the dryer section 37.
  • At least the first dryer section of the dryer section 37 is designed as a single-row dryer section.
  • FIG. 1 shows only the first drying cylinder and the following suction roll.
  • a scraper 33 is provided for keeping clean the smooth surface.
  • a Saugumlenkwalze 34 is arranged for deflecting the first Formierbandes 4 before the removal point 7.
  • a steam blowing device 29 is provided in front of the suction deflecting roll 34.
  • a steam blowing device 30 may be installed in the region of the transfer zone 22.
  • a web stabilizer 31 is provided in the region of the underfelt 21 in front of the first press nip 12 in the loop formed by the underfelt 21.
  • edge cutting devices 32 can be provided for trimming the multilayer fibrous web 2 on both sides.
  • the separated edge strips are thus led away and removed after the removal point 7 from the first forming belt 4 and / or in the region of the counter element 18 of the remaining fibrous web 2.
  • Downstream of the removal point 7 is provided within the loop formed by the first Formierbandes 4 a guide roller 35 which is designed to open and close the gap between the transfer belt 10 and the first Formierband 4 pivotable.
  • the first forming belt 4 is designed as a wire and forms the first forming unit 3a, on which the first layer 2a of the multilayer fibrous web 2 is formed.
  • the first forming belt 4 is assigned a headbox 36 for applying a pulp suspension. This is dewatered by means of known drainage elements through the first Formierband through and thus formed the first layer 2a.
  • This wire section 3 has a second forming unit 3b arranged above the first forming unit 3a, which forms a second layer 2b of the multi-ply fibrous web 2.
  • the second ply 2b of the multi-ply fibrous web 2 is puffed onto the first ply 2a with the aid of a couch roll 6 in a plating zone 5, thus forming the multilayer fibrous web 2.
  • the second ply is puffed up directly onto the first ply.
  • the second layer alsgautscht on one of the intermediate layers.
  • Three- or four-ply fibrous webs can be produced by additional forming units and / or by multi-layer casseroles in combination with the described wire section.
  • the second forming unit 3b is designed as a twin-wire former.
  • the pulp suspension discharged from a headbox 36 is dewatered between two forming belts to form the second layer 2b.
  • FIG. 2 a shows a variant of the press section of the device according to the invention in accordance with FIGS. 1 and 2.
  • the common mating element 18 of the second and third press nips 13, 14 is designed as a roller with a smooth, preferably airtight smoothing belt 19 with a smooth surface, for smoothing the underside of the first layer 2a of the fibrous web 2.
  • the multilayer fibrous web 2 is removed from the dryer fabric of the subsequent drying section directly from the smoothing belt 19 without free train.
  • FIGS. 3, 3a and 3b show further variants of a wire part version of the device according to the invention in a simplified representation.
  • a second forming unit 3b is arranged above the first forming unit 3a formed by the first forming belt 4.
  • FIG. 3a differs from the wire section 3 shown in FIG. 3 by a section-wise two-sided dewatering of the first layer 2a in front of the glazing zone 5.
  • the first forming belt 4 is assigned an upper wire for dewatering the fibrous web upwards.
  • the first forming unit 3a is thus designed as a hybrid former.
  • the first layer 2a of multi-layer fibrous web 2 in a designed as a twin-wire former first forming unit 3a dewatered on two sides.
  • the first forming unit 3a is thus designed as a gap former.
  • the multi-ply fibrous web 2 is guided through the first forming belt 4 until it is picked up by the transfer belt 10 at the take-off point 7. From the Vergautschungszone 5 to the take-off point 7 takes place substantially no more dehydration.
  • the multi-layer fibrous web 2 is by means of a removal device 8, which is formed by the transfer belt 10 and a Abdgingsaugelement 9, from the first forming belt 4 at a take-off point 7 and transferred to the transfer belt 10.
  • the first forming belt 4 runs after the removal point 7 via a guide roller 35 and guide rollers 39 back again.
  • the guide rollers 39 are arranged on a zigzag-shaped line around a substantially horizontally oriented line so that the first forming belt is returned substantially horizontally.
  • the transfer belt 10 is perpendicular, that is inclined at an angle 40 of 90 ° to the manufacturing direction 38, up to the transfer point 23, where the multi-layer fibrous web 2 is passed to the lower felt 21.
  • the transfer zone 22 extends at an angle 40 of 90 ° to the manufacturing direction 38.
  • the first transfer suction element 24.1, the second transfer suction element 24.2 and the third transfer suction element 24.3 are in this example in each case designed as a suction box and arranged in the region of the transfer zone 22.
  • the sides of the separate transfer suction elements 24.1, 24.2, 24.3 facing the transfer belt 10 are provided with an open, water-permeable ceramic covering.
  • the separate transfer suction 24.1, 24.2, 24.3 are each sucked to increase the drainage, wherein the respective negative pressure in the separate transfer suction 24.1, 24.2, 24.3 is independently adjustable.
  • the negative pressure in the suction zones is more than 20kPa.
  • the vacuum supply and the Transferaugaugieri 24.1, 24.2, 24.3 are designed such that the negative pressure is rising from Transfersaugelement to Transfersaugelement adjustable.
  • the first transfer suction 24.1 may have a negative pressure of more than 20kPa
  • the second transfer suction 24. a negative pressure of more than 30kPa
  • the third transfer suction 24.3 have a negative pressure of more than 40kPa.
  • the separate transfer suction 24.1, 24.2, 24.3 each have a collecting channel 41 for collection and removal of the white water, preferably on the drive side of the paper machine, on.
  • the respective collecting channel 41 extends transversely to the production direction and has a laterally arranged connection or a plurality of connections distributed across the production direction for discharging the white water.
  • the collecting channel 41 is arranged and designed so that during the drainage of the multilayer fibrous web. 2 incurred white water can flow freely through the action of gravity. By this arrangement, the removal of, by the taking place in the transfer zone 22 dewatering of the multi-layer fibrous web 2, resulting white water is improved and facilitated.
  • the dewatered white water is dischargeable due to its kinetic energy and gravity effect.
  • the white water can be discharged freely from the three separate transfer suction 24.1, 24.2, 24.3, without having to overcome overflow weirs, as is the case with the horizontal arrangement of the transfer zone 22.
  • the suction roller 9 is associated with a separate channel 28 for discharging the centrifuged white water.
  • FIG. 5 shows a section with a further embodiment of the device 1 according to the invention, which differs from the embodiment shown in FIG. 4 by a lowered delivery point 7.
  • the first Formierband 4 runs after the removal point 7 via a guide roller 35 and guide rollers 39 back again.
  • the guide rollers 39 are arranged on a zigzag-shaped line about a substantially horizontal line, so that the first forming belt 4 is returned substantially horizontally.
  • the vertical distance of the guide roller 35 to the Saugumlenkwalze 34 is increased and the take-off point 7 on a horizontal plane below the substantially horizontally oriented line around which the guide rollers are placed zig-zag arranged.
  • the take-off point 7 is located on a lying below the loop formed by the first forming belt 4 horizontal plane.
  • the height of the subsequent press section 1 1 is reduced or counteracted an increase in the height of the press as a result of a horizontal inclined to the transfer zone 22.

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Abstract

L'invention concerne un dispositif (1), destiné à la fabrication d'une bande de matière fibreuse multicouche (2), comprenant une partie de tamisage (3) destinée à former la bande de matière fibreuse multicouche (2), une partie de pressage (11) destinée à éliminer davantage l'eau de la bande de matière fibreuse multicouche (2) et une partie de séchage (37) destinée à sécher la bande de matière fibreuse multicouche (2). La partie de tamisage (3) comprend une première bande de formage (4) perméable à l'air qui est adaptée pour former une première couche (2a) de la bande de matière fibreuse multicouche (2) et la bande de matière fibreuse multicouche formée (2) est amenée à un point de retrait (7) muni d'un dispositif de retrait (8). Le dispositif de retrait (8) comprend un élément de retrait par aspiration (9) et une autre bande (10) entourant celui-ci et la bande de matière fibreuse multicouche (2) est retirée de la première bande de formage (4) perméable à l'air au point de retrait (7) par le dispositif de retrait (8) et la partie de pressage (11) comprend au moins trois emprises (12, 13, 14). Les deux dernières emprises (13, 14) sont formées par un troisième élément de pressage (17) et un deuxième élément de pressage (16) et un contre-élément commun (18) pourvu d'une surface lisse destinée à lisser le côté de la première couche (2a) de la bande de matière fibreuse multicouche (2) qui est en contact direct avec la première bande de formage (4) perméable à l'air et la première emprise (12) est formée par le deuxième élément de pressage (16) de la deuxième emprise (13) et un premier élément de pressage (15). Selon l'invention, la première emprise (12) est garnie d'un double feutre et comporte un feutre supérieur (20) et un feutre inférieur (21) et l'autre bande (10) est conçue comme une bande de transfert (10) perméable à l'air et s'étend en formant une zone de transfert (22) du point de retrait (7) à un point de transfert (23) de la bande de matière fibreuse (2) au feutre inférieur (21) de la première emprise (12).
EP18717357.0A 2017-05-10 2018-04-12 Dispositif et procédé de fabrication d'une bande de matière fibreuse Withdrawn EP3622112A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102017110032.6A DE102017110032A1 (de) 2017-05-10 2017-05-10 Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn
DE102017111869.1A DE102017111869A1 (de) 2017-05-31 2017-05-31 Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn
PCT/EP2018/059350 WO2018206216A1 (fr) 2017-05-10 2018-04-12 Dispositif et procédé de fabrication d'une bande de matière fibreuse

Publications (1)

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EP3622112A1 true EP3622112A1 (fr) 2020-03-18

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EP18717357.0A Withdrawn EP3622112A1 (fr) 2017-05-10 2018-04-12 Dispositif et procédé de fabrication d'une bande de matière fibreuse

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EP (1) EP3622112A1 (fr)
CN (1) CN110612370B (fr)
WO (1) WO2018206216A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102020101913A1 (de) * 2020-01-28 2021-07-29 Voith Patent Gmbh Vorrichtung zur Herstellung von White Top Kraftliner und Verwendung dieser Vorrichtung zur Herstellung von White Top Kraftliner
AT526620A1 (de) * 2022-11-08 2024-05-15 Mondi Ag Verfahren zur Herstellung einer bedruckbaren Linerbahn für Verpackungen sowie bedruckbarer Liner für Verpackungen
AT526619A1 (de) * 2022-11-08 2024-05-15 Mondi Ag Verfahren zur Herstellung einer bedruckbaren Linerbahn für Verpackungen sowie bedruckbarer Liner für Verpackungen

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
FI86753C (fi) * 1989-05-30 1992-10-12 Valmet Paper Machinery Inc Pressparti foer en pappers- eller kartongmaskin
FI955014A (fi) * 1995-10-20 1997-04-21 Valmet Corp Paperikoneen puristinosa, jossa käytetään pitkänippipuristinta
FI107945B (fi) * 1998-06-30 2001-10-31 Metso Paper Inc Paperirainan vientijärjestely muodostusosalta puristinosalle sekä sitä soveltava paperikone
SE514973C2 (sv) 1999-09-07 2001-05-21 Valmet Karlstad Ab Metod och pappersmaskin för framställning av en liner
FI20075783L (fi) * 2007-11-05 2009-05-06 Metso Paper Inc Rainanmuodostuskone
FI20085782L (fi) 2008-08-22 2010-02-23 Metso Paper Inc Kartonkikone
AT509992B1 (de) * 2010-10-27 2012-01-15 Andritz Ag Maschf Vorrichtung und verfahren zur trocknung von faserstoff
DE102011082159A1 (de) * 2011-09-06 2013-03-07 Voith Patent Gmbh Vorrichtung zur Übergabe und Stabilisierung einer Faserstoffbahn
CN203700859U (zh) * 2012-08-21 2014-07-09 沃依特专利有限责任公司 用于制造纤维幅的机器的压榨部
DE102014210879A1 (de) 2014-06-06 2015-12-17 Voith Patent Gmbh Verfahren zur Herstellung von mehrlagigem Verpackungspapier, Papiermaschine zur Herstellung von mehrlagigem Verpackungspapier und mehrlagiges Verpackungspapier hergestellt nach diesem Verfahren

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CN110612370A (zh) 2019-12-24
WO2018206216A1 (fr) 2018-11-15
CN110612370B (zh) 2022-01-28

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