EP3433420A1 - Dispositif et procédé de fabrication d'une bande de matière fibreuse multicouche - Google Patents

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

Info

Publication number
EP3433420A1
EP3433420A1 EP17712495.5A EP17712495A EP3433420A1 EP 3433420 A1 EP3433420 A1 EP 3433420A1 EP 17712495 A EP17712495 A EP 17712495A EP 3433420 A1 EP3433420 A1 EP 3433420A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
layer
forming unit
multilayer
press
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.)
Granted
Application number
EP17712495.5A
Other languages
German (de)
English (en)
Other versions
EP3433420B1 (fr
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 DE102016204969.0A external-priority patent/DE102016204969A1/de
Priority claimed from DE102016217726.5A external-priority patent/DE102016217726A1/de
Priority claimed from DE102016218100.9A external-priority patent/DE102016218100A1/de
Priority claimed from DE102016218101.7A external-priority patent/DE102016218101A1/de
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP3433420A1 publication Critical patent/EP3433420A1/fr
Application granted granted Critical
Publication of EP3433420B1 publication Critical patent/EP3433420B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—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
    • 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

Definitions

  • the invention relates to apparatus for producing a multilayer fibrous web, comprising a wire section for forming a 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 at least a first forming unit for forming a first layer of multilayer Fibrous web and at least one second forming unit for forming a second layer of the multilayer fibrous web and a Vergautschungszone comprises and the forming units for forming the multilayer fibrous web are arranged and configured such that the second layer of the multilayer fibrous web of the second forming unit on the first layer of the multilayer fibrous web the first forming unit is transferred in the Vergautschungszone for forming the multilayer fibrous web and wherein the press section comprises at least two last press nips, wherein the two last press nips are formed by a first pressing element and a second pressing element and a common counter element with a smooth surface for smoothing one side of the multilayer fibrous
  • 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-ply packaging paper web consisting of a cover, a protective layer and a supine, is produced in a wire section with two forming units and further dehydrated in a press section consisting of a compact press with 3 press nips 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 WO01 / 18309 A1 likewise discloses a paper machine for the production of liners. This is made from two layers in the wire section. In this case, the lighter upper layer is pored onto the lower layer and the two-ply fibrous web is fed to a compact press with 3 press nips and then to a dryer section.
  • a compact press with 3 press nips and then to a dryer section.
  • different press concepts such as compact presses, inverted compact presses and stand-alone press with subsequent compact press with two press nips proposed.
  • the alternative possibility is disclosed to make the lighter upper layer so that it forms the lower layer of the fibrous web, whereby the now upper layer of the fibrous web is dewatered through the now lighter lower layer.
  • an apparatus for producing a multilayer fibrous web comprising a wire section for forming a multilayer fibrous web, a press section for further dewatering of the multilayer fibrous web and a dryer section for drying the multilayer fibrous web, wherein the wire section at least a first forming unit for forming a first layer of multi-layer fibrous web and at least one second forming unit for forming a second layer of the multilayer fibrous web and a Vergautschungszone comprises and the forming units for forming the multilayer fibrous web are arranged and formed to each other such that the second layer of the multilayer fibrous web of the second forming unit is transferred to the first layer of the multilayer fibrous web of the first forming unit in the lining zone to form the multilayer fibrous web and wherein the press section comprises at least two last press nips, the last two press nips being defined by a first pressing member and a first pressing member second pressing member and a common counter-element with a smooth
  • the invention is characterized in that a transfer belt for direct takeover of the multilayer fibrous web at a takeover point of the first forming unit, that is provided by the sieve of the first forming unit, and for further transport of the multilayer fibrous web and that a press belt for direct takeover of multi-layer fibrous web is arranged at a take-off point of the transfer belt and that the multilayer fibrous web is guided together with the press belt in such a way by the penultimate press nip, that the second layer of the multilayer fibrous web comes into contact with the smooth surface of the counter element.
  • the quality, eg. for example, the whiteness or brightness, the second layer of the multi-ply fibrous web in the wire section is not affected by the drainage and at the same time a conventional, simple press section with a compact press without transfer belts for smoothing the common counter element facing side of the second layer of the multilayer fibrous web is used , This also improves the operating behavior, in particular with regard to occurring edge folds or edge tears in the fibrous web.
  • the dewatering capacity is sufficient because the press has two press nips, each with at least one water-absorbent felt.
  • the smoothness of the second layer is improved by the smoothing effect of two press nips, more precisely by the last two press nips.
  • the formed, multilayer fibrous web is transferred by means of the transfer belt on a transport path which extends from the acquisition of the multilayer fibrous web from the screen of the first forming unit to the direct takeover of the multilayer fibrous web by the press belt.
  • the transfer belt is preferably arranged so that at least the essential part of the loop formed by the transfer belt and the transport path runs below the wire section.
  • the essential part may be more than 50%. This allows a compact design. Upgrading existing devices, such as paper machines, is thereby made possible without significantly increasing the overall length.
  • the arrangement has the advantage that the multilayer fibrous web is transported lying on the transfer belt and the force of gravity presses the multilayer fibrous web onto the transfer belt.
  • the multi-ply fibrous web When the multi-ply fibrous web is taken over by the screen of the first forming unit by the transfer belt, the multi-ply fibrous web is completely formed, that is to say that no additional layer or layer is added to the multilayer fibrous web on the transfer belt.
  • the length of the transport path is more than 4 m, in particular more than 6 m, preferably more than 8 m or very preferably more than 10 m.
  • the at least one first and / or the at least one second forming unit are formed as a wire.
  • the wire of the at least one first and / or the at least one second forming unit may serve the purpose of increasing dewatering performance as well as enhancing quality.
  • the at least one first and the at least one second forming unit is associated with a headbox for impinging the corresponding forming unit with a pulp suspension.
  • the pulp suspension for the first forming unit has a different composition than the pulp suspension for the second forming unit.
  • the pulp suspension for the first forming unit at least partially unbleached pulp and / or waste paper contain and the pulp suspension for the second forming unit a lighter pulp than for the first forming unit included.
  • the device is designed to produce a fibrous web from the group of liners, white top testliner, white top kraft liner or white lined chipboard
  • the first layer forms the darker supine layer and the second layer the lighter cover layer with a higher white value of the multilayer fibrous web
  • the basis weight of the multilayer fibrous web is preferably in the range from 70 to 250 g / m 2 7
  • the device may comprise at least one further forming unit for forming at least one further layer of the multilayer fibrous web, wherein the device is designed and arranged such that the further layer is arranged between the cover layer and the backsheet of the multilayer fibrous web.
  • the further forming unit can be assigned to the first and / or the second forming unit.
  • the further layer produced on the at least one further forming unit is transferred to the first and / or the second forming unit for forming the first and / or second layer.
  • the at least one further layer may form the protective layer and / or interlining layer.
  • the headbox associated with the first forming unit is designed as a multi-layer headbox.
  • the first forming unit and / or the second forming unit is associated with a Sekundärstoffauflauf for applying a further pulp suspension to a pre-dewatered fibrous web of the respective forming unit.
  • the secondary casserole is arranged in the direction of the headbox of the respective forming unit at a point at which the pulp suspension applied through the headbox is partially dewatered.
  • the headbox associated with the second forming unit is designed as a multi-layer headbox.
  • a short design in Maschinenlaufnchtung can be achieved by the arrangement of the second forming unit above the first forming unit.
  • the second forming unit is arranged substantially at the same level next to, that is in the machine direction, before the first forming unit. This is particularly advantageous for conversions or new installations in existing buildings at low maximum crane hook height.
  • the common counter-element is formed as a smooth roller. This is a compact, cost-effective and reliable solution.
  • the further press nip is formed by the first pressing member and a counter-roller, wherein the multi-layer fibrous web is guided lying between the press belt and a felt belt through the further press nip.
  • the backing roll can be designed as a press roll with a smooth or grooved and / or blind-drilled surface.
  • the press belt can be designed as a felt belt.
  • the counter-roller is preferably arranged below the first pressing element. The press belt in this case forms the upper felt of the double-felted additional press nip.
  • the transfer belt is made permeable. It can be executed without seam or with seam. Furthermore, it is possible to form the transfer belt as a woven screen or as a band of a molded plastic matrix with integrated reinforcing threads or as a metal strip. The metal band can be heated.
  • a change of the transfer band is possible if the staging are equipped with Cantilevermik. However, it is also the cheaper solution without Cantilevermike.
  • the transfer belt is executed with seam or the vertical stool carriers are on the operating side (leader side) with known insertion devices for automatically passing the transfer belt through the loaded vertical Staune carrier.
  • At least one suction element to improve the contact and cohesion of the first and second layers of the multilayer fibrous web, and to increase the dry content of the multilayer fibrous web arranged.
  • the negative pressure in the at least one suction element is more than 30 kPa, preferably in the range between 30 kPa and 60 kPa, in particular between 40 kPa and 50 kPa.
  • a suction element is arranged within the loop of the transfer belt in the region of the transfer point of the multilayer fibrous web of the first forming unit.
  • the suction element can be designed as a suction box or as a suction roll.
  • the effect of the Saugelements is designed so that substantially no dehydration of the fibrous web takes place, but only the acquisition of the fibrous web is improved.
  • the negative pressure of the suction element is less than or equal to 30 kPa, preferably equal to or less than 20 kPa.
  • the loop of the transfer belt is free of drainage elements.
  • the multi-ply fibrous web is puffed onto the transfer belt in the region of a suction roll arranged within the loop of the first forming unit in front of the suction element.
  • the suction roller dips into the transfer belt. This ensures a reliable transfer of the fibrous web to the transfer belt.
  • At least one stabilizer is arranged as a stabilizing device within the loop of the transfer belt opposite the fibrous web.
  • the stabilizer may be deflated or unabsorbed. It can be designed as a box and / or as a suction roll and / or as a support bar
  • the web guide runs in a straight line, that is to say without deflections on the transfer belt until it is picked up or taken over by the press belt.
  • the acceptance point or takeover point is preferably in front of a deflection roller for deflecting the transfer belt.
  • stabilizing devices are particularly advantageous, since on the one hand he contact the fibrous web to the transfer belt is low, since on the transfer belt before and during continuation no significant dewatering of the fibrous web takes place by vacuum or pressing pressures, as is the case for example on the forming fabric. There, a certain positive connection of the fibrous web with the surface structure of the forming fabric is produced by the dewatering process. On the other hand, forces such as gravity at the bottom run and air friction forces occur, which can be particularly disturbing due to the lack of positive locking of the fibrous web with the transfer belt surface.
  • the fibrous web lies between the transfer point and the delivery point of the fibrous web above the transfer belt and the stabilizers.
  • the influence of gravity thus affects stabilizing on the web and presses the fibrous web on the transfer belt.
  • stabilizing devices These have, for example, support strips which are in contact with the inside of the transfer belt. The course of the transfer belt is thus stabilized, whereby the running behavior of the fibrous web is more stable and thus edge lifting, edge wrinkles and edge tears are avoided.
  • the stabilizing devices can work advantageously both with and without the application of negative pressure. Another advantage is the substantially straight course of the transfer belt between the transfer point and the delivery point.
  • the course is not exactly rectilinear due to the action of the support strips, but the course on the support strips can experience small deflections of less than 1 °, this course should also be understood to be straightforward within the meaning of the invention up to a total deflection of about 10 ° ,
  • the support strips can thus be pressed slightly into the loop of the transfer belt, so that a polygonal course of the transfer belt is formed.
  • the angle of a change in direction of the support strips of the substantially straight course of the transfer belt is a maximum of 0.6 °.
  • support strips which lie flat against the inside of the loop formed by the transfer belt. It is also conceivable to use foil-like support strips which rest with the front edge on the inside of the loop formed by the transfer belt. Such support strips, also called foils, have, seen in the machine direction, after the leading edge on a surface which extends at an angle from the inside of the transfer belt away. Such foils are known in paper technology and are usually used in the forming area for dewatering the fibrous web. There, the fibrous web has enough water to fill the wedge-shaped gap with water and thus to produce a significant negative pressure. In the present application, however, the dry content of the fibrous web is too low to achieve this effect. However, the inventor has realized that even without resulting white water creates a negative pressure, which may be sufficient for stabilization of the fibrous web.
  • the transfer belt is arranged below at least part of the wire section. This reduces the length of the paper machine and reduces building costs. Another advantage is the possibility to install the paper machine concept in existing production halls. Conversions can thus also be realized inexpensively.
  • a plurality of support strips in the machine direction one behind the other and preferably at a distance of 0.5 m to 3m, in particular from 1, 0 m to 2.2 m, arranged and extend transversely to the machine direction. This design is particularly cost-effective.
  • the support strips can be connected to strip holders preferably via a T-connection or dovetail connection, wherein strip holders are in turn mounted on strip body.
  • This known construction has the advantage of easy and quick replacement of the support strips.
  • support strips can be selected from the following group: ceramic, plastic, coated metal strips. In a practical embodiment, support strips extend at least over the entire width of the fibrous web.
  • the support strips extend in sections transversely to the machine direction, wherein the support portions of the adjacent in the machine direction support bars can be arranged in alignment or offset.
  • a plurality of support strip sections are arranged side by side at a distance, so that gaps are formed between the support strips. These gaps allow air to escape in the machine direction. It can thus be avoided or reduced by drag air of the transfer belt resulting dam pressures. Back pressure can promote or even produce a disruptive detachment of the fibrous web from the transfer belt.
  • This possible solution is particularly advantageous for paper machine speeds of over 800 m / min.
  • the pitch in the transverse direction of the support strip sections is preferably constant. In the case of aligned support sections, it is possible that the transfer belt guide is designed to be oscillatable in the transverse direction. This minimizes wear and makes it more even.
  • a plurality of support strips are arranged side by side transversely to the machine direction and preferably at a distance of 0.3 m to 1.5 m, in particular 0.9 m to 1.2 m, and extend longitudinally to the machine direction. This has the advantage of avoiding a back pressure training.
  • the strips may extend between takeover point and delivery point in one or more parts.
  • the transfer belt can be provided oscillatable transversely to the machine direction, preferably with an amplitude of -20 mm to +20 mm. As a result, the wear of the support strips is minimized and uniform.
  • the support strips are arranged within a closed box which is sealed off from the transfer belt and which can be subjected to a vacuum of preferably 20 to 200 Pa, in particular 50 Pa to 120 Pa.
  • the seal to the transfer belt can be designed in the form of circumferential, forming the edge of the box ceramic strips.
  • At least one edge longitudinal suction device can be arranged to stabilize the web edges at the two edge regions of the multilayer, fibrous web on the side of the transfer belt opposite the fibrous web, in particular.
  • the multi-ply fibrous web is transferred directly from a forming fabric of the wire section to the transfer belt at the transfer point, and a suction slot is provided in the region of the transfer point within the loop formed by the transfer belt Transfer suction or a transfer suction and preferably a downstream of this a suction slits having Fixiersauger arranged.
  • the transfer suction or the transfer suction improves the transfer of the fibrous web to the transfer belt.
  • the Fixiersauger stabilizes the contact of the fibrous web to the transfer belt.
  • the device can be designed to produce a multilayer fibrous web from the group of liners, white top testliner, white top kraft liner or white lined chipboard, comprising a light cover layer and a supine layer.
  • the light coverage is preferably in direct contact with the transfer belt.
  • the surface properties of the cover layer can be positively influenced by the design of the transfer belt surface for wetting the paper-contacting surface of the transfer belt with a fluid, preferably with water, whereby the web run can be stabilized by increasing the adhesion of the fibrous web to the transfer belt surface.
  • the moistening unit is designed to apply 1 g / m 2 to 8 g / m 2 , in particular 3 g / m 2 to 5 g / m 2, of the fluid to the paper-contacting surface of the transfer belt.
  • the multilayer fibrous web is passed between the transfer point and the transfer point by the press belt at least partially in a sandwich guide between the transfer belt and a guide belt. This is particularly advantageous at higher speeds of the paper machine, especially at a speed of more than 1200m / min.
  • the guide band is formed at least in sections through the screen of the first forming unit.
  • the transfer belt and the guide belt are guided on the route of the sandwich guide via guide elements, such as guide rollers, strips. They run parallel to each other in this section, and have the same course.
  • the guide band is formed by an additional further, a loop-forming band at least in sections. This solution is advantageous if the fibrous web has to be transported over long distances.
  • the guide strip is formed by the wire of the first forming unit and in a second section the guide tape is formed by an additional, further, loop-forming band
  • the mean course of the sandwich guide is essentially rectilinear and is determined by the alternating arrangement of at least one support roller arranged in the loop formed by the transfer belt to at least one support roller arranged in the loop formed by the guide belt.
  • the rectilinear middle course can also be superimposed zig-zag-shaped sections that resulting from each other by the arrangement of said backup rolls.
  • the change in direction of the course of the sandwich guide by the support rollers in the range of 10 ° to 20 °.
  • the direction change can be designed alternately and forms a straight line on average.
  • the course of the sandwich guide is substantially polygonal and is determined by the arrangement of at least two support rollers arranged in the loop formed by the transfer belt.
  • the support rollers may be arranged on an imaginary arc line, in particular on a circular arc line.
  • guide rollers are used as guide elements from a speed of the paper machine of more than 1300 m / min. Below 1300 m / min and support strips or Stützfoils, the transfer belt facing surface in the machine direction an angle to the transfer belt to form a negative pressure can be used.
  • Guide elements such as guide rollers, support rollers, support strips, Stauerfoils within the loop of the transfer belt have in the region of the sandwich guide preferably a distance of greater than 1, 5 m, and preferably less than or equal to 3m.
  • the guide band is guided away from the multilayer fibrous web in a region of a suction roll arranged in the loop formed by the transfer belt.
  • a suction roll arranged in the loop formed by the transfer belt.
  • the guide belt partially wraps around the suction roll together with the transfer belt so that the vacuum applied to the suction roll forces the pulp web onto the transfer belt.
  • the guide band is guided away from the multilayer fibrous web in front of a suction roll arranged in the loop formed by the transfer belt, wherein the loop formed by the transfer belt suction elements, in particular a transfer suction and / or a flat suction, to support the acquisition of the multilayer fibrous web are arranged by the transfer belt, wherein the flat vacuum cleaner -if existing - is preferably arranged downstream of the transfer suckers.
  • the height of the applied vacuum of the vacuum cleaner and the vacuum cleaner is in each case more than 10 kPa, in particular more than 12 kPa, preferably more than 15 kPa.
  • the drying section comprises a pre-drying section and a post-drying section.
  • a size press can be provided for applying, for example, strength.
  • a calender can be arranged.
  • a tension of the transfer belt in the range between 6 kN / m and 12 kN / m, preferably 8 kN / m is advantageous.
  • a drying wire of the dryer section for taking over the multilayer fibrous web and for transporting the fibrous web into the dryer section is provided directly after the last press nip arranged on the common counter element. The fibrous web is thus transferred directly into the dryer section.
  • a calender is arranged after the dryer section.
  • the object is also achieved by a method for producing a multilayer fibrous web according to claim 14.
  • the multilayer fibrous web is formed in a wire section and passed through a press section for further dewatering of the multilayer fibrous web, as well as through a drying section for drying the multilayer fibrous web.
  • a first layer of the multilayer fibrous web in a first forming unit and a second layer of the multilayer in a second forming unit are produced and the second layer of the multilayer fibrous web is transferred to the first layer of the multilayer fibrous web of the first forming unit in a glazing zone and the multilayer Fibrous web passed through at least two last press nips the press section, the two last Press nips are formed by a first pressing member and a second pressing member and a common counter-element with a smooth surface and wherein one side of the multilayer fibrous web is smoothed by the smooth surface.
  • the multi-ply fibrous web is taken over by a transfer belt directly from the first forming unit and further transported and that the multi-ply fibrous web is taken directly by a press belt from the transfer belt and passed together with the press belt through the penultimate press nip and thereby the second layer the multilayer fibrous web is smoothed by the smooth surface of the counter element.
  • Figure 1 shows a first embodiment of a device according to the invention in a simplified representation
  • Figure 2 shows a second embodiment of a device according to the invention in a simplified representation
  • Figure 3 shows an alternative embodiment of the takeover point of the multilayer
  • the paper type liner is produced as a multilayer fibrous web 11.
  • the liner has at least two layers.
  • the first layer 9 forms the darker back or the supine position and the second layer 10 forms the lighter ceiling or the cover layer of the fibrous web 11.
  • the basis weight of the liner is in a range of 70 to 250 g / m 2.
  • the device 1 1 comprises a wire section 6 for forming a multi-ply fibrous web, a press section 7 for further dewatering and a dryer section 8 for drying the multi-ply fibrous web, which are only partially here is shown.
  • the wire section 6 comprises a first forming unit 2 for forming a first layer 9 of the multilayer fibrous web 11 and a second Forming unit 3 for forming a second layer 10 of the multilayer fibrous web 1 1, and and a Vergautschungszone 37.
  • the forming units 2, 3 are arranged and formed to each other that the second layer 10 of the second forming unit 3 on the first layer 9 of the multilayer fibrous web 1 of the first forming unit 2 in the Vergautschungszone 37 for forming the multilayer fibrous web 1 1 is transmitted.
  • the first and the second forming unit 2, 3 are designed as a wire.
  • One or both forming units 2, 3 may be equipped with a top wire according to FIG. 2 for dewatering on both sides.
  • the supine position is thus formed on the screen 35 of the first forming unit 2 and the cover layer on the screen 36 of the second forming unit 3.
  • the running direction in the sheet forming zone of the screen 35 of the first forming unit 2 is opposite to the machine direction 22.
  • the fibrous web 1 1 is transported by the transfer belt 20 in the machine direction 22 and taken directly from a press belt 19 at a pickup point and guided to the press section 7.
  • the transfer belt 20 thus transfers the multilayer fibrous web 1 1 on a transport path from the acquisition of the multilayer fibrous web 1 1 to the direct takeover of the multilayer fibrous web 1 1 through the press belt 19.
  • the transfer belt is arranged so that the essential part of the through the transfer belt 20th formed loop and thus the transport path runs below the wire section. This allows a compact design.
  • the arrangement has the advantage that the multilayer fibrous web 1 1 is transported horizontally on the transfer belt 20 and the force of gravity presses the multilayer fibrous web onto the transfer belt 20.
  • the length of the transport route is 7 m.
  • the press section 7 comprises two last press nips 12, 13, wherein the last two press nips 12, 13 are smoothed by a first press element 15 and a second press element 16 and a common smooth-surfaced counter element 18 for smoothing one side of the multilayer fibrous web 11, are formed.
  • the multilayer fibrous web 1 1 is guided together with the press belt 19 through the penultimate press nip 12 such that the second layer 10, in this example the cover layer, of the multilayer fibrous web 11 comes into contact with the smooth surface of the counter element 18.
  • This solution has the advantage that the quality, eg. Ex.
  • the brightness of the cover layer of the multi-ply fibrous web 1 1 in the wire section 6 is not affected by the drainage and at the same time a conventional, simple press section 7 with a compact press without transfer belts for smoothing the mutual counter element 18 facing side of the cover layer of the multilayer fibrous web used is.
  • This also improves the operating behavior, in particular with regard to occurring edge folds or edge tears in the fibrous web 11.
  • the dewatering capacity is sufficient because the press has two press nips 12, 13 each having at least one water-absorbent felt 19, 26.
  • the smoothness of the coverage is improved by the smoothing effect of two press nips, more precisely by the last two press nips 12,13.
  • the two layers 9, 10 or only one of the two layers may also be constructed in multiple layers.
  • the multilayered backsheet and / or the multi-layer coverage are then, as described above, brought together to form the multilayer fibrous web 1 1 on the screen of the first forming unit.
  • the fibrous web 1 1 is composed in this case of more than two layers, the further layer or the other layers between the outer layers of the multilayer fibrous web 1 1 are arranged.
  • Each of the forming units 2, 3 is assigned a headbox 4, 5 for supplying a fibrous stock suspension.
  • One or both of the headboxes may also be designed as a multi-layer headbox, the composition of the pulp suspensions in the different layers of a headbox being different.
  • the first layer 9 and / or the second layer 10 of the fibrous web in this case have several layers. This makes it possible to specifically influence the composition and the quality of the individual layers in the thickness direction.
  • this further press nip 14 is double-felted and is formed by the first press element 15, here by way of example as a suction press roll, and a counter-roll 17 designed as a press roll.
  • the fibrous web 1 1 passes through the further press nip, wherein it is between the press belt 19, which is designed as a felt belt, and a felt belt 25.
  • the counter-roller 17 is arranged below the first pressing element 15.
  • the press belt 19 forms in this case the upper felt of the double-felted further press nips.
  • the forming units 2, 3 are arranged one above the other and above the transfer belt 20. This allows a short design. In the loop of the transfer belt support rollers 24 and / or static support strips for supporting the transfer belt 20 are arranged. Additionally or alternatively, stabilizers may be provided as shown and described in FIG.
  • a dryer 27 of the dryer section 8 for direct takeover of the multi-layer fibrous web 1 1 and for the transport of the fibrous web is provided in the dryer section 8.
  • the fibrous web is thus transferred directly into the dryer section.
  • the fibrous web 1 1 is passed through the drying wire 27 via the drying cylinders 28 and suction deflection rollers 29 of the first drying group of the drying section 8.
  • the fibrous web 1 1 can be provided in one application unit or both sides with a starch screed.
  • a pigment coating can be applied to it.
  • a calender can be provided.
  • At least one suction element 38 for improving the contact and the cohesion of the first and the second layer 9,10 of the multilayer fibrous web 1 1, respectively.
  • the negative pressure in the at least one suction element is more than 30 kPa, preferably in the range between 30 kPa and 60 kPa, in particular between 40 kPa and 50 kPa.
  • FIG. 2 shows another possible design of the wire section 6.
  • the second forming unit 3 is arranged essentially at the same level next to, that is to say in the machine direction 22, in front of the first forming unit 2. This is particularly advantageous for conversions or new installations in existing buildings at low maximum crane hook height.
  • the wire of the first forming unit 2 is assigned a top wire 30.
  • the forming first layer 9 is drained to both sides.
  • the sheet structure is thereby symmetrical and increases the drainage performance. It is also possible to equip the second forming unit 3 with a top wire.
  • a suction element 21 is arranged within the loop of the permeable transfer belt 20 in the region of the takeover point 34 of the multilayer fibrous web 11 of the first forming unit 2.
  • the suction element 21 may be designed as a suction box or as a suction roll.
  • the suction roller 32 dips in the process in the transfer belt. As a result, a reliable transfer of the fibrous web 1 1 is ensured on the transfer belt 20.
  • At least one stabilizer 31 is disposed within the loop of the transfer belt 20 with respect to the fibrous web 1 1.
  • the stabilizer 31 may be aspirated or unabsorbed. It can be designed as a box or as a suction roll or Foilplatte acting as Stützfoil. Between the stabilizers 31 optional support rollers 24 may be provided.
  • the further course of the fibrous web 1 1 and the configuration of the press section 7 and the dryer section 8 correspond to the exemplary embodiment of FIG. 1. Corresponding elements of the embodiments in Figure 1 and Figure 2 are provided with the same reference numerals.
  • At least one suction element 38 for improving the contact and the cohesion of the first and the second layer 9,10 of the multilayer fibrous web 1 1, respectively.
  • the negative pressure in the at least one suction element is more than 30 kPa, preferably in the range between 30 kPa and 60 kPa, in particular between 40 kPa and 50 kPa.
  • FIG. 3 shows an alternative embodiment of the transfer point 34 of the multilayer fibrous web from the first forming unit 2 to the transfer belt 20.
  • a takeover suction roll 33 to support the acquisition of the multilayer fiber web 1 1 of the first forming unit 2, that is, from the screen 35 of the first forming unit 2, respectively.
  • the transfer suction roll 33 dips into the screen 35 of the first forming unit 2.
  • the wire 35 of the first forming unit 2 is led away from the multi-ply fiber web 11.
  • the fibrous web thus lies on the upper side of the transfer belt 20.
  • the vacuum in the suction zone of the suction roll 33 is in the range of less than 30 kPa. This ensures that the multilayer fiber web 1 1 is no longer dehydrated. This does not affect the whiteness of the ceiling.
  • the features of the design variants shown in the various figures can in principle be combined with one another. The invention is therefore not limited to the feature combinations of the specific embodiments.

Landscapes

  • Paper (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

L'invention concerne un dispositif (1) de fabrication d'une bande de matière fibreuse multicouche comprenant une section de tamisage (6), une section de pressage (7) et une section de séchage (8). La section de tamisage (6) comprend une première unité de formage (2) destinée à former une première couche (9) de la bande de matière fibreuse (11) et une seconde unité de formage (3) destinée à former une seconde couche (10) de la bande de matière fibreuse (11) et les unités de formage (2, 3) sont disposées les unes par rapport aux autres et conçues de telle sorte que la seconde couche est transférée sur la première couche dans une zone de couchage (37) pour former la bande de matière fibreuse multicouche. La section de pressage (7) comporte au moins deux dernières emprises de pressage (12, 13). Les deux dernières emprises de pressage (12, 13) sont formées par un premier élément de pressage (15) et un second élément de pressage (16) et un contre-élément commun (18) pourvu d'une surface lisse destinée à lisser un côté de la bande de matière fibreuse multicouche (11). Le dispositif (1) de l'invention est caractérisé en ce qu'une bande de transfert (20) est prévue pour transférer directement la bande de matière fibreuse multicouche (11) de la première unité de formage (2) et pour transporter ensuite la bande de matière fibreuse multicouche (11), en ce qu'une bande de pressage (19) est prévue pour transférer directement de la bande de matière fibreuse multicouche (11) depuis la bande de transfert (20) et en ce que la bande de matière fibreuse multicouche (11) est guidée conjointement avec la bande de pressage (19) à travers l'avant-dernière emprise de pressage (12) de telle sorte que la seconde couche (10) de la bande de matière fibreuse multicouche (11) vient en contact avec la surface lisse du contre-élément (18).
EP17712495.5A 2016-03-24 2017-03-21 Dispositif et procédé de fabrication d'une bande de matière fibreuse multicouche Active EP3433420B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE102016204969.0A DE102016204969A1 (de) 2016-03-24 2016-03-24 Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn in einer Papiermaschine
DE102016217726.5A DE102016217726A1 (de) 2016-09-16 2016-09-16 Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn in einer Papiermaschine
DE102016218100.9A DE102016218100A1 (de) 2016-09-21 2016-09-21 Vorrichtung zur Herstellung einer Faserstoffbahn in einer Papiermaschine
DE102016218101.7A DE102016218101A1 (de) 2016-09-21 2016-09-21 Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn in einer Papiermaschine
PCT/EP2017/056721 WO2017162685A1 (fr) 2016-03-24 2017-03-21 Dispositif et procédé de fabrication d'une bande de matière fibreuse multicouche

Publications (2)

Publication Number Publication Date
EP3433420A1 true EP3433420A1 (fr) 2019-01-30
EP3433420B1 EP3433420B1 (fr) 2019-12-25

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EP17712495.5A Active EP3433420B1 (fr) 2016-03-24 2017-03-21 Dispositif et procédé de fabrication d'une bande de matière fibreuse multicouche

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EP (1) EP3433420B1 (fr)
CN (1) CN108884633B (fr)
WO (1) WO2017162685A1 (fr)

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US11920299B2 (en) * 2020-03-06 2024-03-05 Ibs Of America Formation detection system and a process of controlling

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3915791A (en) * 1972-05-12 1975-10-28 Black Clawson Co Method for producing multi-ply paper on a twin-wire machine
SE514973C2 (sv) 1999-09-07 2001-05-21 Valmet Karlstad Ab Metod och pappersmaskin för framställning av en liner
FI20085782L (fi) * 2008-08-22 2010-02-23 Metso Paper Inc Kartonkikone
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

Also Published As

Publication number Publication date
WO2017162685A1 (fr) 2017-09-28
EP3433420B1 (fr) 2019-12-25
CN108884633A (zh) 2018-11-23
CN108884633B (zh) 2021-04-02

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