EP4347949A1 - Procédé et dispositif - Google Patents

Procédé et dispositif

Info

Publication number
EP4347949A1
EP4347949A1 EP22722488.8A EP22722488A EP4347949A1 EP 4347949 A1 EP4347949 A1 EP 4347949A1 EP 22722488 A EP22722488 A EP 22722488A EP 4347949 A1 EP4347949 A1 EP 4347949A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
web
cooling
convection
steam
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
EP22722488.8A
Other languages
German (de)
English (en)
Inventor
Julia SPENGLER
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 EP4347949A1 publication Critical patent/EP4347949A1/fr
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0253—Heating or cooling the rolls; Regulating the temperature
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • 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
    • 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
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/008—Steam showers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00—Damping devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0045—Paper-making control systems controlling the calendering or finishing

Definitions

  • the invention relates to a method for producing or treating a fibrous web according to claim 1 and a corresponding device according to claim 9.
  • fibrous webs In the production of fibrous webs, a large number of quality requirements are placed on the end product. For example, paper, cardboard or packaging webs need a sufficiently good surface smoothness to ensure good printability or stable application of coatings.
  • One or more calender nips are usually used for this purpose, in which the fibrous web is smoothed using pressure and heat
  • these products also require a comparatively high level of mechanical stability in order to enable reliable processing or to allow the finished end product - e.g. to give a package the necessary strength. This strength increases with the thickness of the fibrous web.
  • European patent specification EP 2,682,520 B1 proposes cooling the fibrous web.
  • a humidifier in conjunction with a Cooling means arranged to produce moisture evaporation from the fibrous web with a latent thermal cooling effect.
  • the colder web is less easily deformed, so that it is less compressed in the calender nip.
  • Another object of the invention is to enable volume-preserving smoothing with simple and inexpensive means.
  • convection cooling is used below. In the context of this application, convection cooling is to be understood as meaning cooling by means of an air flow. Both passive cooling and active cooling are conceivable.
  • the object is achieved by a method for producing or treating a fibrous web, in particular a paper or cardboard web, which comprises the following steps: a. Drying the fibrous web in a drying section b. Subsequent cooling of at least a first side of the fibrous web by means of convection cooling, the fibrous web having a temperature of 65° C. and less, preferably 50° C. and less, after cooling on at least the first side. c. Application of steam to at least the first side of the fibrous web, in which case the temperature on the first side after the steam application is at least 70°C, preferably more than 80°C or 90°C. i.e. Treatment of the fibrous web in at least one calendering nip.
  • the fibrous web After the fibrous web has been dried in step a), the fibrous web is very hot. Temperatures of up to 120°C are possible, temperatures of 60°C and below are hardly ever measured directly after the dryer section. Values between 70°C and 110°C, in particular 80°C, 90°C or 100°C, are common.
  • the fibrous web can have a web moisture content of between 6% and 12%, in particular between 7% and 8%, when it leaves the dryer section. Due to the high web temperature, however, the web is relatively soft, so that if it were to run directly through a calendering nip, the web would be significantly compressed. Therefore, in the present method, the fibrous web is also cooled after the drying section.
  • the central idea of the present invention is a combined smoothing of temperature gradients and humidity gradients.
  • the web which is very hot and very dry after the dryer section, should be conditioned before it enters the calendering nip in such a way that the web is as cold and dry as possible on the inside, while it is at least on its first side or on both sides in the surface area is humid and warm.
  • the moist and warm surface is then sufficiently soft and deformable so that a good smoothness can easily be achieved in the calendering nip. Since the core of the web is comparatively cold, the compressibility in this area remains low, so that the thickness in the calendering nip is largely retained.
  • the moisture gradient i.e. the fact that the web is fed into the calendering nip very dry on the inside, also helps to maintain thickness.
  • the web is cooled by convection cooling, on at least a first side - preferably on both sides.
  • the web temperature is reduced by cooling with air and the web remains dry - in contrast to cooling by applying water.
  • the fibrous web is not moistened between leaving the drying section and cooling in step b).
  • the web is then subjected to steam on at least one side--in particular both sides.
  • the steam can also be a steam-air mixture.
  • the steam condenses on the cool surface of the fibrous web, both heating and moistening the surface of the web. Inside, however, the track remains relatively cool and dry.
  • a relatively low surface temperature of the fibrous web is important to enable good condensation of the steam.
  • the web is cooled to a temperature below 60°C, in particular below 55°C or below 50°C and preferably below 45°C.
  • the temperature of the surface increases again. It is advantageous here if the temperature of the fibrous web is at least 70° C., preferably more than 80° C. or 90° C., on at least the first side after it has been impinged with steam. The moisture on the surface also increases as a result. After the steam has condensed on the paper web, the moisture on the surface can be 15% or more.
  • the fibrous web is then guided into a calendering nip and treated there, in particular smoothed. As described above, the thickness of the web is largely retained during smoothing.
  • the surface temperature of the first side of the fibrous web should preferably be at least 60.degree. C., in particular at least 70.degree. C., preferably between 80.degree. C. and 90.degree.
  • the distance between the end of the steam application and the calendering nip is not more than 1 m, in particular 80 cm or less or 50 cm or less. An even shorter distance of, for example, 30 cm or less would be desirable, but is often difficult to achieve due to structural constraints.
  • the at least one calendering nip is formed from a heated roller and a counter-element, with the heated roller having a surface temperature of 220° C. or more and coming into contact with the first side of the fibrous web.
  • thermo rollers are generally heated by means of a heating fluid, specifically an oil.
  • a heating fluid specifically an oil.
  • the heating fluid of the heated roller is fed to the heated roller at a temperature of at least 240°C, preferably between 260°C and 310°C.
  • special thermal oils are required. However, these are usually difficult to handle and mostly poisonous.
  • a further advantage of the present invention is that good smoothing can be achieved through the temperature and moisture gradients in the web without requiring extremely high temperatures for the heating roller, which means that these toxic special oils can be dispensed with.
  • the effective surface temperatures that can be reached during operation with a heating fluid also depend on how much thermal energy is dissipated with the fibrous web. In general, more heat is dissipated at higher line loads in the calendering nip and at higher production speeds.
  • the heated roller has a large diameter.
  • the roller diameter can be more than 1 m, in particular also 1.50 m or 1.60 m. In most cases, surface temperatures of over 200°C, especially over 220°C, can be achieved via the heating fluid. However, it can be difficult to reach temperatures above 240°C.
  • the heated roller can be additionally heated by a heating bar, which is directed against the thermal roller from the outside and heats the roller by means of induction or a temperature-controlled air flow.
  • the roll surface can be heated stably and reliably to temperatures above 220°C, preferably in the range between 230°C and 250°C.
  • the at least one calendering nip can advantageously be operated with a line load of at most 150 N/mm, in particular less than 100 N/mm, preferably with a line load of between 10 N/mm and 40 N/mm.
  • a line load of at most 150 N/mm, in particular less than 100 N/mm, preferably with a line load of between 10 N/mm and 40 N/mm.
  • the fibrous web can be any paper or cardboard web.
  • it can be a cardboard web that is made up of 2 or more layers and has a basis weight between 100 g/m 2 and 600 g/m 2 , in particular between 150 g/m 2 and 450 g/m 2 .
  • That heavy and also thick fibrous webs lend themselves particularly well to treatment according to an aspect of the present invention. Due to the high thickness or the large mass inside the web, the coolness and the dry content are retained particularly well in these webs when the surface is heated and moistened by condensation of the steam. The moisture and temperature gradients are therefore particularly pronounced in these thick and heavy varieties.
  • the process can be carried out over a wide range of speeds. Provision can thus be made for the fibrous web to move at a speed of between 600 m/min and 1600 m/min, in particular between 800 m/min and 1400 m/min. Especially at slower speeds of 800 m/min or less, passive convection cooling can be advantageous, since the distance required for cooling due to the lower speed will not be too great. In contrast, in particular at speeds of 800 m/min and higher, the provision of an active convection cooler is advantageous in order to avoid excessively large structural sizes. For this reason, it can also be advantageous to use the installation space of the free distance in an existing passive convection cooling in order to provide an active convection cooler there, which can open up the possibility of higher operating speeds.
  • a press section is usually provided in paper or board machines before the drying section.
  • the fibrous web is dewatered by mechanical pressing.
  • the web is usually guided between two felts through one or more press nips.
  • the fibrous web runs through the press nip either only supported on a felt (“laying press”) or without any felt at all (“offset press”).
  • laying press a felt
  • offset press without any felt at all
  • At least the first side of the fibrous web is in direct contact with the smooth press roller, to which steam is later applied. It has shown, that by providing such a wet press, a volume-preserving smoothing can be achieved, since the fibrous web comes out smoother from the dryer section, and less smoothing has to be achieved in the calender.
  • the wet press often achieves only little dewatering of the web.
  • the dry content increases, for example, by less than 2 percentage points, in particular by 1 percentage point or less.
  • the fibrous web can be dewatered before the wet press by at least one, preferably two, double-felted shoe presses.
  • the wet press itself can be designed as a roller press or as a single-felted shoe press.
  • the calender has means for thickness calibration in the at least one calendering nip, in order to adapt the thickness of the fibrous web over the web width.
  • the calibration means can be a thermal calibration, for example.
  • a temperature profile is applied to a calender roll, the thermo roll or the backing roll, over its width from the outside. Points with a higher temperature expand more, which increases the radius of the roll at this point and increases the pressure in the calendering nip.
  • a pressure profile in the calendering nip can thus be set by the temperature profile, which in turn influences the thickness profile of the fibrous web. In particular, at comparatively high surface temperatures in the calender, for example 220° C. or more, it has been shown that the thermal calibration is less efficient.
  • the deflection control roll is usually not designed as a thermo roll.
  • a preferred calendering nip can then be made up of a thermo roll and a deflection-controlled roll as a counter-roll.
  • the object is achieved by a device for producing or treating a fibrous web, in particular a paper or cardboard web, the device comprising a drying section for drying the fibrous web and a calender with at least one calendering nip for treating, in particular smoothing, the fibrous web.
  • the device has a steam blower box in front of the calender in the direction of web travel for applying steam to a first side of the fibrous web, and means for convection cooling are provided between the dryer section and the steam blower box, which are suitable for at least the first side of the fibrous web to be cooled by convection to a temperature of 65°C and less, in particular to 50°C and less.
  • the means for convection cooling are implemented as passive cooling through a free section of the fibrous web, the free section being at least 5 m, preferably at least 7 m, in particular 10 m or more long.
  • the means for convection cooling include or consist of active cooling by at least one convection cooler, the convection cooler being set up to blow air onto at least the first side, in particular onto both sides of the fibrous web.
  • a certain free distance will preferably be provided before and/or after the convection cooler.
  • this can then usually be designed according to the criteria of favorable web guidance and does not have to make any significant contribution to convection cooling.
  • a more stable web run can be achieved if the web is blown with air from both sides at the same time or at a very small distance.
  • such a convection cooler is very compact.
  • a very good cooling of the web can already be achieved with an MD extension of between 1m and 2m, e.g. 1.5m.
  • the convection cooler can also have an MD extension of more than 4m, in particular up to 6m.
  • passive cooling can hardly be implemented in a sensible way, since this would require an extremely long free section.
  • one or more cooling cylinders can be provided instead of a convection cooler.
  • the fibrous web can then be passed over these cooling cylinders so that it is in contact with one or both sides of the cooled cylinder surfaces.
  • These cylinder surfaces can be cooled to temperatures below 40°C, especially below 30°C or 25°C.
  • cooling cylinders require a comparatively large amount of space and are relatively expensive. Therefore, convection cooling is preferred, especially for newly built systems.
  • a convection cooler can have means for conditioning the air.
  • the conditioning can be done by tempering, preferably by cooling the air.
  • the conditioning can also take place by humidifying and/or dehumidifying the air. Appropriate conditioning of the air blown onto the web can greatly influence the effect of the convection cooler.
  • the web can then be wound up.
  • provision can also be made for further process steps to follow after the calender.
  • one or more coating units can also be provided.
  • the at least one calendering nip to be formed from a heated roller and a counter-element, with the heated roller being able to be heated to a surface temperature of 220°C or more and being arranged in such a way that it is in contact with the first side of the fibrous web contact occurs.
  • the counter element can advantageously be formed by a deflection compensation roll. This makes it possible, for example, to profile the calendering nip.
  • the diameter of the heated roller and/or the deflection roller can be between 400 mm and 1600 mm.
  • the diameters of the two rollers can be the same. However, it can also be provided that the diameter of the deflection compensation roll deviates by a maximum of 50%, preferably a maximum of 40%, from the diameter of the heated roll. In most cases, the deflection compensation roll then has a smaller diameter than the heated roll.
  • the calendering nip can be designed as a hard nip or as a soft nip.
  • One or both rolls of the calendering nip can in particular have a hardness of 60° ShoreD to 98° ShoreD, preferably between 88 and 92° ShoreD.
  • one or both rolls of the calender can be composite rolls.
  • the calendering nip can consist of a roller nip.
  • the calendering nip can also be an extended nip, such as in a shoe calender or a belt calender.
  • a second steam blower box can also be provided for applying steam to the second side of the fibrous web.
  • this is advantageously arranged between the convection cooler and the calendering nip.
  • FIG. 1 shows a device according to one aspect of the present invention
  • FIG. 2 shows a device according to a further aspect of the present invention
  • FIG. 3 shows a convection cooler for use in a device according to a further aspect of the invention
  • FIG. 1 shows a device according to one aspect of the invention, which is suitable for carrying out a method according to the invention.
  • a drying section 10 is provided, in which a fibrous web 1, for example a paper or cardboard web 1, is dried.
  • the web 1 leaves the drying section 10 with a low residual moisture content of usually below 12%, for example 7% or 8% and a high temperature, for example between 75°C and 90°C.
  • a calender 2 is provided in FIG. 1 for further processing of the web 1 .
  • the calender 2 is shown here by way of example as a roll calender 2 which has a felt roll 4 and a counter roll 5 which together form the calendering nip 3 .
  • the felt roller 4 can have a surface temperature of 220° C. or more and is in contact with the first side 1a of the fibrous web 1 .
  • the backing roll 5 can be designed as a deflection compensation roll.
  • any other types of calenders can also be provided, for example shoe or belt calenders which have an extended calendering nip 3 .
  • a measuring device such as a scanner can usually also be provided after the calender 2 . After the calender 2, in particular after the scanner, the web 1 can then be wound up. Alternatively, however, provision can also be made for further process steps to follow after the calender 2 .
  • one or more coating units can also be provided.
  • means 6 for convection cooling of the web 1 are provided after the drying section.
  • the web 1 is guided via guide rollers 8 to a convection cooler 6 in which it can be actively cooled.
  • a convection cooler 6 in which it can be actively cooled.
  • air is blown at least on the first side 1a of the web 1, in particular on both sides of the web 1.
  • a more stable web run can be achieved if the web 1 is blown with air from both sides at the same time or at a very small distance.
  • This air can be taken directly from the environment - for example from a cooler area of the production plant such as the machine cellar - or it can be conditioned before it is applied to the fibrous web 1 .
  • cooling the air for example by means of a suitable heat exchanger, is advantageous since this can significantly improve the cooling effect of the convection cooler 6, so that after the convection cooler 6 a significantly lower web temperature can be achieved.
  • the web 1 is subjected to steam on at least the first side 1a.
  • a steam blower box 7 is provided in the device shown. The steam is intended to condense on the web 1 and both moisten and heat the region near the surface.
  • the web temperature is 50° C. or less after the means for convection cooling or before entry into the steam box. With the active convection coolers 6, the temperature can also be lowered significantly further, for example to 45°C or 40°C.
  • a second steam blower box can also be provided, which is arranged in such a way that the second side of the fibrous web is subjected to steam. After leaving the steam box 7, the web 1 has, at least on the first side 1a, the temperature and moisture gradients that are desired to achieve volume-preserving smoothing.
  • the steam blower box 7 is therefore preferably arranged very shortly in front of the calendering nip 3, so that the distance between the steam blower box 7 and the calendering nip 7 is at most 1000 mm, in particular at most 500 mm
  • FIG. 2 differs from that in FIG. 1 only in the configuration of the means for convection cooling.
  • convection cooling is realized as passive cooling through a free section of the fibrous web 1 in FIG.
  • the free section is at least 5 m, preferably at least 7 m, long.
  • the embodiment according to FIG. diverted twice, three times, four times or more by guide rollers 8, so that even with a limited structural length of the device, a sufficient free section for cooling the web 1 can be provided.
  • FIG. 3 schematically shows a section of a convection cooler 6 for actively cooling the fibrous web 1, as can be used, for example, in an embodiment according to FIG.
  • Two rows of nozzles 61 are provided, each of which blows an air stream 62 onto the fibrous web 1 .
  • the nozzles 61 in the upper row act on the first side 1a of the web 1 with an air stream 62, the nozzles 61 on the lower row act on the second side.
  • the nozzles 61 extend over the entire width of the web 1 (CD-cross direction) and are arranged one behind the other in the running direction (MD-machine direction).
  • FIG. 3 shows an example of two or three nozzles 61 per row.
  • a distance in the MD direction can advantageously be provided between the nozzles 61 of each row.
  • the distance which can correspond in particular to the MD expansion of a nozzle 61, allows the air flow 62 to be discharged without problems after it has hit the web 1. Nevertheless, such a convection cooler 6 is very compact.
  • a very good cooling of the web can already be achieved with an MD extension of between 1m and 2m, eg 1.5m. However, larger MD expansions of up to 4m, 5m or 6m are also possible.
  • An active convection cooler 6 with two rows of nozzles, as shown here, has the advantage that the web 1 is cooled from both sides, which enables faster cooling. In addition, the web run of web 1 is also stabilized. Because the first side 1a is subjected to an air flow 62, the web deviates downwards. The air currents 62 from the lower nozzles 61 counteract this and direct the web 1 back up again. By alternately pushing and lifting, the web 1 runs in a slight undulating motion, but essentially stable and straight through the convection cooler 6.
  • the air for the air streams 62 can simply be ambient air, which is usually 30° and more in the vicinity of a paper machine, and can also be quite humid. Alternatively, the air can also be conditioned and, for example, cooled to 25° or 20°C and possibly also dehumidified.

Abstract

L'invention concerne un procédé et un dispositif correspondant pour produire ou traiter une nappe fibreuse, en particulier une nappe de papier ou de carton, comprenant les étapes suivantes consistant à : a) sécher la nappe fibreuse dans une section de séchage, b) par la suite, refroidir au moins un premier côté de la nappe fibreuse au moyen d'un processus de refroidissement par convection, la nappe fibreuse ayant une température inférieure ou égale à 65 °C, en particulier inférieure ou égale à 50 °C, sur au moins le premier côté après le processus de refroidissement, c) appliquer de la vapeur sur au moins le premier côté de la nappe fibreuse, la température sur le premier côté étant égale à au moins 70 °C, de préférence étant supérieure à 80 °C ou à 90 °C, après l'application de la vapeur, et d) traiter la nappe fibreuse dans au moins une ligne de contact de calandrage.
EP22722488.8A 2021-05-28 2022-04-12 Procédé et dispositif Pending EP4347949A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021113813.2A DE102021113813A1 (de) 2021-05-28 2021-05-28 Verfahren und Vorrichtung
PCT/EP2022/059761 WO2022248116A1 (fr) 2021-05-28 2022-04-12 Procédé et dispositif

Publications (1)

Publication Number Publication Date
EP4347949A1 true EP4347949A1 (fr) 2024-04-10

Family

ID=81597744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22722488.8A Pending EP4347949A1 (fr) 2021-05-28 2022-04-12 Procédé et dispositif

Country Status (5)

Country Link
US (1) US20240084509A1 (fr)
EP (1) EP4347949A1 (fr)
CN (1) CN117355647A (fr)
DE (1) DE102021113813A1 (fr)
WO (1) WO2022248116A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0957202B1 (fr) 1998-05-08 2004-03-31 V.I.B. Systems GmbH Procédé et dispositif pour la fabrication de papier SC-A online
DE19826899B4 (de) * 1998-05-08 2005-05-19 V.I.B. Systems Gmbh Verfahren und Vorrichtung zur Online-Kalandrierung von SC-A-Papier
DE29818437U1 (de) * 1998-10-16 1998-12-17 Valmet Corp Hebe- und Belastungsvorrichtung eines Kalanderwalzenstapels
EP2682520B1 (fr) 2012-07-03 2016-06-22 Valmet Technologies, Inc. Procédé de production d'une bande fibreuse et ligne de production d'une bande fibreuse
WO2018141727A1 (fr) * 2017-02-03 2018-08-09 Voith Patent Gmbh Traitement de bande continue
WO2018171959A1 (fr) 2017-03-21 2018-09-27 Voith Patent Gmbh Traitement de bande
DE102017106047A1 (de) 2017-03-21 2018-03-01 Voith Patent Gmbh Bahnbehandlung
DE102018106322A1 (de) 2018-03-19 2019-09-19 Voith Patent Gmbh Kühl-Behandlung

Also Published As

Publication number Publication date
WO2022248116A1 (fr) 2022-12-01
DE102021113813A1 (de) 2022-12-01
CN117355647A (zh) 2024-01-05
US20240084509A1 (en) 2024-03-14

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