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
  • D21F1/00—Wet end of machines for making continuous webs of paper
  • D21F1/48—Suction apparatus
• • 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
  • D21F11/06—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type
  • D21F11/08—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder 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
  • D21F3/00—Press section of machines for making continuous webs of paper
  • D21F3/02—Wet presses
  • D21F3/08—Pressure rolls

Definitions

• the invention relates to a trained according to the preamble of claim 1 means for producing a fibrous web, in particular a paper or board web.
• a device of the type mentioned in the introduction is e.g. from DE 10 201 1 003 970 A1.
• the device comprises a first forming unit with a for
• Endless circulation arranged first screen belt, a first headbox, which is adapted to apply suspended pulp for forming a single-layered first layer of the fibrous web on the first wire belt, and a first dehumidifying device, which is adapted to the applied from the first headbox on the first wire belt pulp for molding to dehumidify the first layer of fibrous web.
• a second forming unit of this known device has a
• Endless circulation arranged second screen belt, a second and a third headbox, each adapted to apply suspended pulp for forming a layer of a two-layer second layer of the fibrous web on the second wire, and a second dehumidifying arrangement, which is adapted from the second and the second headbox applied to the third headbox pulp for forming the second layer of the
• the second forming unit is arranged above the first forming unit, so that the second wire belt is guided along a Gautschwalze on the first wire to draw on the couch roll the second layer on the first layer of the fibrous web.
• the two headboxes of the second forming unit are each as
• the invention has for its object to provide a trained according to the preamble of claim 1 means for producing a fibrous web having at least two layers at least three layers, such as in particular a paper or board web, so that while ensuring at least the same quality of the fibrous web lower
• a device for producing a fibrous web having at least two layers at least three layers comprises: a first forming unit with a first screen belt arranged for endless circulation, a first
• Headbox adapted to apply suspended pulp to the first wire for forming a first layer of the fibrous web, and preferably to a first dehumidifying assembly configured to dehumidify the web applied to the first wire from the first headbox to form the first layer of fibrous web ; and a second
• Forming unit with a arranged for endless circulation second screen belt, a second headbox, which is arranged, suspended pulp for Forming a second layer of the fibrous web to apply to the second wire, and preferably a second dehumidifying arrangement, which is arranged, that of the second headbox on the second wire belt
• the second forming unit is arranged above the first forming unit, so that the second wire belt preferably runs along the first wire belt via a couch roll, which forms a suction point, in order to draw the second layer onto the first layer of the fibrous web at the point of casting, and the first and second forming units are arranged to form the layers such that one of the first and second layers forms at least two layers and the other of the first and second layers forms at least one layer of the at least three-layered fibrous web.
• the inventive device is characterized in that at least one of the first and the second headbox is formed as a multi-layer headbox, so that at least two superimposed fibrous suspension layers can be dispensed simultaneously for forming a layer having at least two layers.
• the first headbox may be formed as a multi-layer headbox or the second headbox may be configured as a multi-layer headbox or may both be formed by the first headbox and the second headbox each as a multi-layer headbox.
• At least one of the first and the second headbox is formed as a multi-layer headbox
• Sheet formation can be performed simultaneously on two already superimposed layers of the relevant layer of the fibrous web and can thus be reduced while ensuring at least the same quality of the fibrous web, the number of components. This reduces the
• the preferably associated dehumidifying arrangement can simultaneously realize the dehumidification, in particular dewatering, of two already superposed layers of the relevant layer of the fibrous web and can thus be reduced while ensuring at least the same quality of the fibrous web, the number of components.
• Langsiebformer formed and is the other of the first and the second forming unit in the dehumidification arrangement with a
• Double-wire former formed.
• a wire former realizes dehumidification, in particular dewatering, only from the side of the respective screen belt (first or second screen belt), i. only on one
• a twin-wire former realizes dehumidification, in particular
• the twin-wire former is formed as a hybrid former, which before the of the respective screen belt (first or second screen belt) and the
• the hybrid former is set up such that it complies with a change in an extension direction of the screen belt of the forming unit provided therewith of at least 90 degrees and preferably greater than 90 degrees.
• the hybrid former the respective screen belt (first or second screen belt) over a longer distance, including after a deflection, can thus follow the drainage of the location of the
• Fiber web to be optimized.
• Multilayer casserole forming unit formed by the first and second forming unit with the twin-wire former.
• the position of the fibrous web which optionally contains more moisture than a single-layer layer, is dehumidified with the twin-wire former. This can ensure the desired quality
• the second headbox provided in the second forming unit is designed as a multi-layer headbox.
• the device for producing the fibrous web also has a pressing device.
• the pressing device comprises a first roller train (arrangement of interacting rollers) with a takeover roller and a first press roller, around the lateral surfaces of which a first felt belt is guided for endless circulation, wherein the transfer roller is arranged so that the first felt belt passes over the first
• Transfer roller after the Gautschstelle or Gautschwalze along the first wire belt is guided, and is set up, which are the three layers
• the mating roll cooperates with the first press roll so that a first press nip is formed therebetween around the first felt web located fibrous web under direct surface contact facing away from the first felt belt first surface side of the fibrous web with the smooth surface of the mating roll through the first press nip pass therethrough.
• the first press nip is simply asbilzt, so that the first felt facing away from the first surface side of the fibrous web with the smooth surface of the mating roll in direct
• Fibrous web these first surface side of the fibrous web are brought to a higher surface quality, i. be formed smoother or with less roughness.
• the pressing device also has a second roller train with a second press roller, around the lateral surface of which a second felt belt is guided for endless circulation.
• the mating roll cooperates with the second press roll so that a second press nip is formed therebetween to receive the fibrous web after direct passage through the first press nip on the second felt belt
• the first surface side of the fibrous web can be brought to an even higher surface quality, i. be made even smoother or with even less roughness.
• the pressing device could also be designed as a correspondingly felted tandem press known per se. It comprises two shoe press nips arranged one behind the other. The fibrous web is guided in each case lying between two press belts through the first and second press nip.
• a lower press belt is used in the first and / or in the second nip, which has a lower roughness than the upper press belt.
• the lower roughness press belt may be a fine felt or a plastic belt which may be water permeable or water impermeable.
• the underside of the fibrous web comes into contact with the lower roughness surface of the lower press belt.
• the first forming unit and the pressing device are arranged so that the first surface side of the fibrous web provided for direct surface contact with the smooth surface of the counter-roller is formed by the first layer of the fibrous web formed in the first forming unit first forming unit provided first headbox is designed as a single-layer casserole.
• the first layer of the fibrous web formed in the first forming unit is preferably provided as the top layer of the fibrous web, and the first surface side of the fibrous web is to be imaged, in particular too
• the device for producing the fibrous web can thus be set up in particular for producing a testliner web as a fibrous web. Since testliner is used as a ceiling paper, in particular in corrugated board production, the highest quality requirements can be met here with the smoothed first surface side of the fibrous web formed by the first layer or top layer.
• the device according to the invention for producing a fibrous web thus even provides an improved quality of the fibrous web at a lower production cost for the device.
• the inventive device for producing a fibrous web and a Capacity increase in terms of producible amount of fibrous web can be achieved.
• Fig. 1 shows a schematic side view of a according to a first
• Embodiment of the invention formed device for producing a fibrous web.
• Fig. 2 shows a schematic side view of one according to a second
• Embodiment of the invention formed device for producing a fibrous web.
• Embodiment of the invention formed device 1 for producing a at least two layers L1, L2 at least three layers having fibrous web FB, such as in particular a paper or board web are described.
• the device 1 has a first forming unit 10, which comprises a first screen belt arrangement 1 1 arranged for endless circulation, a first headbox arrangement 16 and a first dehumidifying arrangement 20.
• the first screen belt assembly 1 1 has a first screen belt 12 and a
• the first headbox assembly 16 is adapted to apply suspended pulp for forming a single-layered first layer L1 of the fibrous web FB onto the first screen belt 12 of the first screen belt assembly 11.
• the first headbox assembly 16 to a first headbox 17, which is designed as a single-layer headbox, for the first layer of the L1
• the first dehumidifying arrangement 20 comprises a sifting table 21 and a plurality of suction-air-based suction boxes 22 which are arranged in succession in the running direction LR1 of the first sieve belt 12 after the first headbox 17 below the first sieve belt 12.
• Pulp and for forming the first layer L1 of the fibrous web FB Pulp and for forming the first layer L1 of the fibrous web FB.
• the first forming unit 10 with the first screen belt assembly 11, the first headbox assembly 16 and the first dehumidifying assembly 20 forms a first forming system 2 of the device 1 for producing the fibrous web FB.
• the device 1 also has a second
• Forming unit 25 which is set up for endless circulation second
• Siebbandan extract 26 a second headbox assembly 31 and a second dehumidifying 33 includes.
• the second screen belt assembly 26 has a second screen belt 27 and a plurality of rotatably mounted rollers 28, 29 and a rotatably mounted couch roll 30 around which rollers 28-30, the second wire belt 27 with a running direction LR2 clockwise (as shown in FIG. 1) , ie, opposite to the running direction LR1 of the first wire belt 12 of the first wire belt assembly 1 1, endlessly circulates.
• the second head box assembly 31 is adapted to apply suspended pulp to the second wire 27 of the second wire belt assembly 26 to form a two layer second layer L2 of the fibrous web FB.
• the second headbox assembly 31 a second headbox 32, which is designed as a multi-layer headbox to output for the second layer L2 of the fibrous web FB two superposed pulp suspension layers simultaneously on the second wire 27 of the second screen belt assembly 26.
• An exemplary embodiment of a multilayer headbox is described, for example, in DE 10 2010 030 707 A1.
• the second dehumidifying arrangement 33 comprises a plurality of suction-air-based
• the twin-wire zone 36 which defines a twin-wire former, is formed by a longitudinal section of the second wire belt 27, a top wire belt or endless wire belt 38 endlessly revolving around a plurality of rotatably mounted rollers 37, a plurality of below
• Twin-wire zone 36 together with the pre-dewatering performed by the suction boxes 34 and the second wire 27, forms a hybrid former
• Fibrous web FB Fibrous web FB.
• Types of such hybrid formers are, for example, in
• the high vacuum-based suction box 35 at the end of the twin-wire zone 36 on the side facing away from the second layer L2 of the fibrous web FB side of the second wire 27 arranged.
• the second forming unit 25 with the second screen belt arrangement 26, the second head box arrangement 31 and the second dehumidifying arrangement 33 forms a second forming system 3 of the device 1 for producing the fibrous web FB.
• the second forming system 3 is arranged above the first forming system 2, that for supporting the two layers
• Expand fibrous web FB Expand fibrous web FB.
• the screen belts 12, 27 of the first and the second screen belt assembly 1 1, 26 are arranged so that they include in their respective direction LR1 or LR2 in front of the couch roll 30 a preferably acute inlet angle W1 (angle less than 90 degrees) with each other and themselves in their respective running direction LR1 or LR2 immediately after the couch roll 30 preferably extend approximately in the same direction.
• the upper second layer L2 runs in the acute entry angle W1 to the horizontal lower in a production direction PR moving lower first layer L1 in the Gautschstelle and thus already has one
• a Gautschwalzen malmesser is defined in a range of 400 mm to 1500 mm.
• Gautschwalze 30 may also be grooved or smooth.
• the device 1 in the production direction PR also has a first and a second forming systems 2, 3 downstream
• the first compactor 81 has a suction roller rotatably mounted pickup roller or pickup roller 82, a plurality of each rotatably mounted guide rollers 83 and designed as a suction pressure roller rotatably mounted first press roller 84 to the lateral surfaces (not labeled) to the endless circulation in a running direction LR3 clockwise (as shown in FIG. 1), a first felt 85 is guided.
• the pickup roller 82 is arranged so that the first felt belt 85 is guided along the take-up roller 82 in the direction of production PR or running direction LR1, LR2 after the couch roll 30 on the first screen belt 12 of the first screen belt assembly 1 1, and is arranged having the three layers Two-layer fibrous web FB from the first wire belt 12 to the first felt belt 85 to transfer.
• the takeover roll 82 thus forms with the first wire 12 of the first forming 2 a transfer point P1 to the three-layered two-ply fiber web FB of the first wire 12 of the first
• Forming system 2 to be transferred to the pressing device 80.
• Transfer point P1 is optionally formed with a closed lateral surface (not designated).
• the counter roll 90 has a smooth lateral surface (not designated) and cooperates with the first press roll 84 so that between them
• Simply felt first nip NP1 is formed around the fibrous web FB located on the first felt belt 85 under direct surface contact of a from the first felt belt 85 facing away from the first surface side FS1 of
• the first compactor 81 may have a rotatably mounted pressure roller 86, which presses the fibrous web FB to the first press roller 84 just before the first press nip NP1.
• Felt web 85 facing away from the first surface side FS1 of the fibrous web FB with the smooth surface of the backing roll 90 comes into direct surface contact, in addition to the further dehumidification of the fibrous web FB this first surface side FS1 of the fibrous web FB can be brought to a higher surface quality, i. be formed smoother or with less roughness.
• the second roller 91 has a plurality of respectively rotatably mounted guide rollers 92 and a rotatably mounted second press roller 93, around the lateral surfaces (not designated) for endless circulation in a running direction LR4 clockwise (as shown in FIG. 1) a second felt 94 is guided.
• the central counter roll 90 cooperates with the second press roll 93 so as to form therebetween a single-ply second press nip NP2 to receive the fibrous web FB after passing through the first press nip NP1 on the second felt belt 94 under direct surface contact with that of the second Felt web 94 facing away from the first surface side FS1 of the fibrous web FB with the smooth surface of the mating roll 90 through the second press nip NP2 pass.
• the first surface side FS1 of the fibrous web FB facing away from the second felt web 94 comes into direct surface contact with the smooth lateral surface of the backing roll 90 the first surface side FS1 of the fibrous web can be next to the further dehumidification of the fibrous web FB FB be brought to an even higher surface quality, ie even smoother or be formed with even less roughness.
• Forming 2 and the pressing device 80 so arranged so that the direct surface contact with the smooth surface of the mating roll 90 provided first surface side FS1 of the fibrous web FB is formed by the formed in the first forming unit 10 first layer L1 of the fibrous web FB.
• the first layer L1 of the fibrous web FB formed in the first forming unit 10 is preferably provided as the top layer of the fibrous web FB, and the smoothed first surface side FS1 of the fibrous web FB is intended to be imaged, in particular to be printed, surface side of the fibrous web FB.
• the device 1 for producing the fibrous web FB can be set up in particular for producing a testliner web as a fibrous web FB. Since testliner as a ceiling paper in particular in corrugated board production
• a device 1a designed according to a second embodiment of the invention for producing a fibrous web FB having at least two layers L1, L2 at least three layers, in particular a paper or board web, will be described.
• the device 1 a shown in FIG. 2 is identical to the device 1 shown in FIG. 1 except for a few differences. For this reason, with respect to the device 1a shown in Fig. 2 to the device 1 shown in Fig. 1, identical components are provided with reference numerals identical to Fig. 1, and their repeated description is omitted. Accordingly, in
• Forming system 3a with a second forming unit 25a Forming system 3a with a second forming unit 25a.
• the second forming unit 25a again comprises the second screen belt arrangement 26 and the second headbox arrangement 31 as well as a modified second one
• the second dehumidifying arrangement 33a comprises a plurality of suction-air-based suction boxes 34a, a twin-wire zone 36a and two others
• the twin-wire zone 36a which defines a twin-wire former, is formed by a longitudinal section of the second wire 27, a top wire or forming wire 38a endlessly revolving around a plurality of rotatably mounted rollers 37a, a plurality of former strips 39a arranged below the longitudinal section of the second wire 27 and a suction-air-based suction box 40a disposed above the length portion of the second screen belt 27 and the former belts 39a.
• Twin-wire zone 36a together with the pre-dewatering performed by the suction boxes 34a and the second wire 27, forms a hybrid former
• Obersiebbandes 38a provided rollers 37a of the twin-wire zone 36a of the hybrid former arranged so that the twin-wire zone 36a of the hybrid former a change of a direction of extension of the second wire 27 of the second forming unit 25a of at least 90 degrees and here preferably greater than 90 degrees.
• the twin-wire zone 36a of the hybrid former can follow the second wire 27 over a relatively long distance, ie even after its deflection, and thus the dewatering of the second layer L2 of the fibrous web FB can be optimized.
• one of the high-vacuum-based suction boxes 35a of the twin-wire zone 36a is at the end of the second layer L2 of the fibrous web FB remote from the second screen belt 27 arranged.
• the second forming unit 25a with the second screen belt arrangement 26, the second headbox assembly 31 and the modified second dehumidifying arrangement 33a forms the modified second forming system 3a of the device 1 a for producing the fibrous web FB.

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Citations (7)

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• 2015
  • 2015-04-29 EP EP15726869.9A patent/EP3152360B1/de active Active
  • 2015-04-29 WO PCT/EP2015/059305 patent/WO2015185295A1/de active Application Filing
  • 2015-04-29 CN CN201580030140.6A patent/CN106414844B/zh active Active

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