EP4034705A1 - Machine et procédé de fabrication d'une bande de papier support de décor - Google Patents

Machine et procédé de fabrication d'une bande de papier support de décor

Info

Publication number
EP4034705A1
EP4034705A1 EP20788717.5A EP20788717A EP4034705A1 EP 4034705 A1 EP4034705 A1 EP 4034705A1 EP 20788717 A EP20788717 A EP 20788717A EP 4034705 A1 EP4034705 A1 EP 4034705A1
Authority
EP
European Patent Office
Prior art keywords
press
base paper
paper web
decorative base
roll
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.)
Pending
Application number
EP20788717.5A
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
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP4034705A1 publication Critical patent/EP4034705A1/fr
Pending 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
    • 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
    • D21F1/44—Watermarking devices
    • D21F1/46—Dandy rolls
    • 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
    • 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

Definitions

  • the invention relates to a machine for the production of a single-layer decorative base paper web, with a forming section designed as a fourdrinier wire with a circulating dewatering screen and a headbox for applying at least one fiber suspension layer to the dewatering screen and preferably with a dandy roll dipping into the side of the at least one fiber suspension layer facing away from the dewatering screen, as well as with a press section and a drying section, the at least one fiber suspension layer on the dewatering screen being dewatered and the decorative base paper web being formed with a screen side and an upper side.
  • a forming section designed as a fourdrinier wire with a circulating dewatering screen and a headbox for applying at least one fiber suspension layer to the dewatering screen and preferably with a dandy roll dipping into the side of the at least one fiber suspension layer facing away from the dewatering screen, as well as with a press section and a drying section, the at least one fiber suspension layer on the dewatering screen being dewatere
  • Decorative base paper webs have one side on which high quality requirements are placed in the further manufacturing process. This side forms the functional side and must be as smooth as possible, homogeneous and free of sieve and felt markings. To achieve this, machine concepts with a complicated structure of the press section are used.
  • the document DE 10 2008 042730 A1 discloses a method and a machine for dyeing decorative papers.
  • a fiber suspension is applied through a headbox onto a dewatering screen of a Fourdrinier wire and dewatered there.
  • a dandy roll is arranged above the fourdrinier.
  • the formed decorative paper web is removed directly from the dewatering screen by a felt and guided to the press section and through the first two press nips for further dewatering, the first press nip being double-felted.
  • a further, individually standing press with an upper press roll and a lower press roll, which form a press nip is arranged below.
  • This press nip is simply felted and arranged in such a way that the upper press roller comes into direct contact with the top of the decorative paper web.
  • the press nip follows the dryer section with drying cylinders and web stabilizers.
  • the paper quality is often inadequate with regard to the quality of the surface of the upper side of the paper web.
  • the known devices have a complex press section in order to ensure an acceptable paper quality.
  • the known press sections are also prone to breaks, especially at high speeds. This results in poor runnability and runtime efficiency of the decor paper machine.
  • the object of the invention is therefore to simplify the production of a decorative base paper web, to increase the runnability of the paper web, and to improve the surface quality of the upper side of the decorative base paper web, which forms the functional side.
  • Claim 1 specifies a machine for producing a single-layer decorative base paper web, with a forming section designed as a fourdrinier wire with a circulating dewatering screen and a headbox for applying at least one fiber suspension layer to the dewatering screen and preferably with one of the at least one fiber suspension layer dipping into the side facing away from the dewatering screen Dandy roll, as well as with a press section and a drying section, the at least one fiber suspension layer on the dewatering screen being dewatered and the decorative base paper web being formed with a screen side and an upper side.
  • the invention is characterized in that a transfer belt for taking over the decorative base paper web from the dewatering screen is arranged in such a way that the upper side of the decorative base paper web comes into direct contact with the transfer belt and the transfer belt is free of a press nip or dewatering element used to increase the dryness of the decorative base paper web.
  • a transfer belt for taking over the decorative base paper web from the dewatering screen is arranged in such a way that the upper side of the decorative base paper web comes into direct contact with the transfer belt and the transfer belt is free of a press nip or dewatering element used to increase the dryness of the decorative base paper web.
  • This solution enables the decorative base paper web to be further treated without impairing the very good surface quality of the upper side of the decorative base paper web, which is also produced, for example, by using a dandy roll.
  • the very good quality of the upper side that is to say the functional side of the decorative base paper web, can thus be retained and even improved.
  • simply constructed press sections can also be used.
  • the direction of travel of the dewatering wire in the area of the forming and dewatering zone runs in the opposite direction to the production direction of the decorative base paper web.
  • the decorative base paper web is removed from the transfer belt by a pickup roller arranged within a pickup felt and is guided through the pickup felt to the press section, which is formed by exactly three press nips.
  • the pick-up felt therefore only comes into contact with the wire side of the decorative base paper web.
  • the decorative base paper web is guided through the first press nip of the press section, resting on the pick-up felt.
  • the press section preferably comprises a central roller with a smooth surface for smoothing the decorative base paper web and for forming one first press nips together with a suction pressure roller and to form a second press nip together with a press roller, the top side of the decorative base paper web coming into direct contact with the smooth surface of the central roller.
  • Another press nip is formed between the suction pressure roller and a smoothing press roller, the smoothing press roller coming into direct contact with the upper side of the decorative base paper web.
  • the upper side that is to say the functional side of the decorative base paper web, is thus smoothed by the smooth surface of the central roller in the first and second press nip and additionally in the further press nip.
  • a fourth, stand-alone press for smoothing the top can thus be omitted. This reduces the susceptibility to demolition and increases runnability. At the same time, an exceptionally good functional page is created.
  • the suction pressure roller has a high vacuum zone in the area of the further press nip.
  • the suction roll is preferably designed in such a way that a vacuum in the range from 40 kPa to 60 kPA can be applied in the high vacuum zone.
  • the length of the high vacuum zone measured in the production direction is in a range from 1.5 to 2.5 times the nip length of the further press nip.
  • the suction pressure roller can be at least partially wrapped by a first press felt, which is designed as a pick-up felt for removing the decorative base paper web from the transfer belt and can be guided through the further press nip and through the first press nip and the press roller can be at least partially wrapped by a second press felt , which can be guided through the second press nip.
  • a first press felt which is designed as a pick-up felt for removing the decorative base paper web from the transfer belt and can be guided through the further press nip and through the first press nip
  • the press roller can be at least partially wrapped by a second press felt , which can be guided through the second press nip.
  • the smoothing press roll has a roll cover made of rubber or a polyurethane matrix with fillers or made of polyurethane with a smooth surface for smoothing the top of the decorative base paper web. This improves the smoothing effect and the operating behavior.
  • the roller cover made of rubber preferably has a thickness in the range from 5 mm to 20 mm and a hardness between 40 P&J and 220 P&J.
  • the roller cover made of polyurethane preferably has a thickness in the range from 15 mm to 25 mm and a hardness between 30 P&J and 150 P&J.
  • the P&J hardness (Pusey & Jones) is determined in accordance with the ASTM D 531 standard. The measuring method is usually used to determine the hardness of roll covers in the paper industry.
  • a doctor preferably a double doctor, in which two doctor blades are arranged one behind the other, can be assigned to the smoothing press roll. This prevents the formation of a dirt deposit on the surface of the roller cover. In addition, packing the smoothing press roll with the decorative base paper web is avoided.
  • the press roll is formed by a shoe press roll.
  • the dewatering can be increased by a gentle increase in the pressing pressure and at the same time the paper quality can be maintained or even increased.
  • the central roll is wrapped in a smoothing belt.
  • the surface of the smoothing belt is very smooth for smoothing the top of the decorative base paper web.
  • the smooth surface of the central roller is replaced by the surface of the smoothing belt with regard to the smoothing function.
  • the smoothing belt guides the decorative base paper web without free tension through the drying wire of the drying section until the decorative base paper web is removed.
  • the decorative base paper web is therefore constantly supported. This is beneficial in high speeds and / or with a decorative base paper web with low strength potential. This also reduces the susceptibility to demolition.
  • smoothing press roller and its function are replaced by a combination of press roller and a smooth belt wrapping around it.
  • the smooth belt should be softer than the press roll and should preferably be made of rubber or polyurethane.
  • the smooth tape is impermeable to water. The pressure against the upper side of the decorative base paper web is chosen so that no drainage occurs in the direction of the smooth strip.
  • a pivotably mounted guide roller for taking over the decorative base paper web from the dewatering screen by the transfer belt or for maintenance purposes can be arranged within the loop formed by the transfer belt.
  • support elements in particular transfer foils and / or support rollers and / or vacuum web stabilizers, which can be operated with a negative pressure of less than 100 Pa, in particular less than 300 Pa, preferably less than 150 Pa, can be placed opposite the side of the transfer belt carrying the decorative base paper web, be provided.
  • a method for producing a single-layer decorative base paper web is proposed, with a forming section designed as a fourdrinier wire with a circulating dewatering screen and a headbox for applying at least one fiber suspension layer to the dewatering screen and preferably with a dandy roll dipping into the side of the at least one fiber suspension layer facing away from the dewatering screen, and with a press section and a drying section, the at least one The fiber suspension layer on the dewatering screen is dewatered and the decorative base paper web is formed with a screen side and a top side.
  • the method is characterized in that the top of the decorative base paper web with the transfer tape to take over the decorative base paper web from the drainage sieve
  • Transfer tape is brought into direct contact and the
  • Decorative base paper web is not pressed or dewatered on the transfer belt.
  • the transfer belt is therefore not used for dewatering, but preferably only for transporting the decorative base paper web from the dewatering screen to the first press felt, which guides the decorative base paper web through the first press nip.
  • the top side of the decorative base paper web which represents the functional side, is not pressed against a covering, so that the surface quality of the top side is not impaired.
  • This solution enables the decorative base paper web to be further treated without impairing the very good surface quality of the upper side of the decorative base paper web, which is also produced, for example, by using a dandy roll.
  • the very good quality of the upper side that is to say the functional side of the decorative base paper web, can thus be retained.
  • simply constructed press sections can also be used.
  • the direction of travel of the dewatering wire in the area of the forming and dewatering zone runs in the opposite direction to the production direction of the decorative base paper web.
  • the decorative base paper web is removed from the transfer belt by a pick-up roller arranged within a pick-up felt and is guided through the pick-up felt to the press section, which is formed by exactly three press nips.
  • the decorative base paper web is preferably guided through the pick-up felt, through the first press nip.
  • the first press nip is preferably formed by a suction pressure roller and a central roller with a smooth surface to smooth the top of the decorative base paper web
  • the second press nip is formed by a press roller and the central roller and, in addition, a further press nip is formed between the suction pressure roller and a smoothing press roller
  • the smoothing press roll is brought into direct contact with the top side of the decorative base paper web.
  • the top side of the decorative base paper web is thus brought into direct contact with the smooth surface of the central roll and with the smooth surface of the smoothing press roll.
  • the upper side, i.e. the functional side of the decorative base paper web is thus smoothed in all three press nips by the smooth surface of the central roller, with a perfect result.
  • a further stand-alone press for smoothing the top can thus be omitted. This reduces the susceptibility to demolition and increases runnability.
  • the suction pressure roller is at least partially wrapped by a first press felt, which is designed as a pick-up felt for removing the decorative base paper web from the transfer belt and is guided through the further press nip and through the first press nip and the press roller is at least partially covered by a second press felt wrapped around it, which is passed through the second press nip.
  • a first press felt which is designed as a pick-up felt for removing the decorative base paper web from the transfer belt and is guided through the further press nip and through the first press nip and the press roller is at least partially covered by a second press felt wrapped around it, which is passed through the second press nip.
  • the smoothing press roller is preferably designed with a roller cover made of rubber or a polyurethane matrix with fillers or made of polyurethane with a smooth surface for smoothing the top of the decorative base paper web. If the roll cover is made of rubber, the thickness of the roll cover is selected from the range from 5mm to 20mm and the hardness of the roll cover from the range 40 P&J and 220 P&J.
  • the thickness of the roll cover is selected from the range from 15mm to 25mm and the hardness of the roll cover from the range 30 P&J and 150 P&J.
  • a pivotable guide roller can be provided within the loop formed by the transfer belt, whereby the guide roller is pivoted towards the dewatering screen to take over the decorative base paper web from the dewatering screen or the guide roller is pivoted away from the dewatering screen for maintenance purposes.
  • FIG. 1 shows an embodiment of a machine according to the invention in a simplified representation
  • FIG. 2 shows a detail from FIG. 1 with a press section and a drying section
  • FIG. 1 shows, by way of example and in a simplified representation, an embodiment of a machine 1 according to the invention for production a single-layer decorative base paper web 2, with a forming section 4 designed as a fourdrinier wire with a circulating dewatering screen 6 and a headbox 5 for applying at least one fiber suspension layer to the dewatering screen 6 and preferably with a dandy roll dipping into the side of the at least one fiber suspension layer facing away from the dewatering screen 6, as well as with a press section 13 and a drying section 22, wherein the at least one fiber suspension layer on the dewatering screen 6 is dewatered and the decorative base paper web 2 is formed with a screen side and an upper side 3.
  • Below the forming section 4 is a
  • Transfer tape 10 for taking over the decorative base paper web 2 from the dewatering screen 6 is arranged so that the top side 3 of the decorative base paper web 2 comes into direct contact with the transfer tape 10 and the transfer tape 10 is free of a press nip or dewatering element used to increase the dryness of the decorative base paper web 2.
  • the top 3 of the decorative base paper web 2 which represents the functional side, is not pressed against a covering, whereby the
  • Decorative base paper web 2 to deteriorate.
  • the very good quality of the upper side 3, that is to say the functional side of the decorative base paper web 2 can thus be retained or even improved.
  • simply constructed and advantageous press sections 13 can also be used.
  • the pulp suspension is fed through the headbox 5 in a jet onto the dewatering screen.
  • the jet direction is essentially the same as the running direction LF of the dewatering wire 6 in the area of the forming and dewatering zone of the forming section 4.
  • a dandy roll 7 is arranged, which is slightly into the side of the pulp suspension facing away from the dewatering wire 6 immersed.
  • Dewatering elements 8 are arranged in the area of the forming and dewatering zone.
  • the decorative base paper web 2 is transferred to the transfer belt 10 in the area of a transfer roller 9.
  • the decorative base paper web 2 is then transported by the transfer belt 10 in the production direction Lp, which is opposite to the running direction L F of the dewatering wire 6 in the area of the forming and dewatering zone of the forming section 4, in the direction of the press and drying section (13, 22).
  • support elements 12 in particular transfer foils and / or support rollers and / or vacuum web stabilizers, which can be operated with a negative pressure of 300 Pa, in particular 150 Pa, are provided opposite the side of the transfer tape 10 carrying the decorative base paper web 2.
  • a pivotably mounted guide roller 11 for taking over the decorative base paper web from the
  • Dewatering screen 6 arranged by the transfer belt 10 or arranged pivotably for maintenance purposes. To take over the
  • a transfer suction device can be provided within the transfer belt 10.
  • Decorative base paper web 2 is removed from the transfer belt 10 by a swiveling pick-up roller 21 arranged within the loop of a first press felt 19, which is designed as a pick-up felt, and passed through the pick-up felt 19 to the press section 13, which is passed through exactly three press nips 17, 18, 27 is formed.
  • the pick-up felt 19 therefore only comes into contact with the wire side of the decorative base paper web 2.
  • the decorative base paper web 2 is in contact with the pick-up felt 19 and passed through the first press nip 17 of the press section 13.
  • the press section 13 comprises a central roller 14 with a smooth surface for forming a first press nip 17 together with a suction pressure roller 15 and to form a second press nip together with a press roller 16, the top side 3 of the decorative base paper web 2 coming into direct contact with the smooth surface of the central roller 14.
  • a smoothing press roll 24 is provided which, together with the suction pressure roll 15, forms a further press nip 27, which is upstream of the first press nip 17 as seen in the production direction Lp.
  • the suction pressure roller 15 has a high vacuum zone 26 in the area of the further press nip 27, which is designed such that negative pressures of 40 kPa to 60 kPa can be applied.
  • the length of the high vacuum zone 26 measured in the production direction is in a range of 1.5 to 2.5 times the nip length of the further press nip 27.
  • the high vacuum zone 26 increases the runnability of the decorative base paper web 2, so that it is securely connected to the first press felt 19 with runs.
  • the smoothing press roller 24 is designed with a roller cover made of rubber or polyurethane with a smooth surface for smoothing the top side 3 of the decorative base paper web 2.
  • the smoothing press roll is assigned a double doctor, in which two doctor blades are arranged one behind the other. This prevents the formation of a dirt deposit on the surface of the roller cover.
  • packing of the smoothing press roll 24 with the decorative base paper web 2 is avoided. All three press nips are simply felted.
  • the upper side 3, that is to say the functional side of the decorative base paper web 2 is intensively smoothed by the smooth surface of the central roller 14 press nip in the first press nip 17 and in the second press nip 18 and in the further press nip 27.
  • the press section has 3 press nips 17, 18, 27, all of which are simply felted. A further stand-alone press for smoothing the top 3 can thus be omitted. This reduces the susceptibility to demolition and increases runnability.
  • the suction pressure roll 15 is partially wrapped by the first press felt 19, in this example by the pick-up felt, and the press roll 16 is partially wrapped by the second press felt 20.
  • the second press nip 18 is designed as a nip press. However, it can also be designed as a shoe press nip. After the second press nip 18, the decorative base paper web 2 is transferred to the drying section 22 and there dried by direct contact of the top 3 with the surface of drying cylinders 23.
  • FIG. 2 shows a possible further development of the machine 1 with a press section 13 and a drying section 22.
  • a smoothing belt 28 wraps around the central roll 14.
  • the surface of the smoothing belt 28 is made very smooth for smoothing the top side 3 of the decorative base paper web 2 and is also passed through the first press nip 17. There the decorative base paper web 2 is taken over by the first press felt 19.
  • the smooth surface of the central roller 14 is replaced by the surface of the smoothing belt 28 with regard to the smoothing function.
  • the smoothing belt 28 guides the decorative base paper web 2 without free tension until the decorative base paper web 2 is removed through the drying wire of the drying section.
  • the decorative base paper web 2 is therefore constantly supported. This is advantageous at high speeds and / or in the case of a decorative base paper web 2 with a low strength potential.

Landscapes

  • Paper (AREA)

Abstract

L'invention concerne une machine (1) permettant de fabriquer une bande de papier support de décor (2) monocouche, ladite machine présentant une section de formage (4) conçue sous forme de toile sans fin (4) dotée d'un tamis d'égouttage (6) périphérique et d'une caisse de tête (5) destinée à appliquer au moins une couche de suspension de matière fibreuse sur le tamis d'égouttage (6) et de préférence d'un égoutteur (7) plongeant dans une face de ladite au moins une couche de suspension fibreuse située à l'opposé du tamis d'égouttage (6), ainsi qu'une section de pressage (13) et une section de séchage (22), ladite au moins une couche de suspension fibreuse étant égouttée sur le tamis d'égouttage (6) avec pour effet de former la bande de papier support de décor (2) comportant une face supérieure et une face inférieure (3). La machine selon l'invention se caractérise en ce qu'une bande de transfert (10) destinée à prendre la bande de papier support de décor (2) du tamis d'égouttage (6) est agencée de sorte que la face supérieure (3) vient directement en contact avec la bande de transfert (10) et en ce que la bande de transfert (10) est exempte de ligne de contact de pressage ou d'élément d'égouttage servant à augmenter la siccité de la bande de papier support de décor (2).
EP20788717.5A 2019-09-26 2020-09-24 Machine et procédé de fabrication d'une bande de papier support de décor Pending EP4034705A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019125929.0A DE102019125929A1 (de) 2019-09-26 2019-09-26 Maschine und Verfahren zur Herstellung einer Dekorrohpapierbahn
PCT/EP2020/076651 WO2021058615A1 (fr) 2019-09-26 2020-09-24 Machine et procédé de fabrication d'une bande de papier support de décor

Publications (1)

Publication Number Publication Date
EP4034705A1 true EP4034705A1 (fr) 2022-08-03

Family

ID=72801454

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20788717.5A Pending EP4034705A1 (fr) 2019-09-26 2020-09-24 Machine et procédé de fabrication d'une bande de papier support de décor

Country Status (4)

Country Link
EP (1) EP4034705A1 (fr)
CN (1) CN114450449A (fr)
DE (1) DE102019125929A1 (fr)
WO (1) WO2021058615A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008042730A1 (de) 2008-10-10 2010-04-15 Voith Patent Gmbh Verfahren zum Färben von Papieren
DE102011077523A1 (de) * 2011-06-15 2012-12-20 Voith Patent Gmbh Maschine zur Herstellung einer einseitig-glatten Faserstoffbahn
DE102016217726A1 (de) * 2016-09-16 2018-03-22 Voith Patent Gmbh Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn in einer Papiermaschine
DE102016204969A1 (de) * 2016-03-24 2017-05-18 Voith Patent Gmbh Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn in einer Papiermaschine

Also Published As

Publication number Publication date
DE102019125929A1 (de) 2021-04-01
CN114450449A (zh) 2022-05-06
WO2021058615A1 (fr) 2021-04-01

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