EP3910103A1 - Procédé et système permettant d'appliquer une couche de substance sur une bande de fibres en mouvement par application de mousse - Google Patents

Procédé et système permettant d'appliquer une couche de substance sur une bande de fibres en mouvement par application de mousse Download PDF

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Publication number
EP3910103A1
EP3910103A1 EP21170038.0A EP21170038A EP3910103A1 EP 3910103 A1 EP3910103 A1 EP 3910103A1 EP 21170038 A EP21170038 A EP 21170038A EP 3910103 A1 EP3910103 A1 EP 3910103A1
Authority
EP
European Patent Office
Prior art keywords
foam
fiber web
application
angle
advantageously
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
EP21170038.0A
Other languages
German (de)
English (en)
Inventor
Reijo PIETIKÄINEN
Tapio Pitkäniemi
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.)
Valmet Technologies Oy
Original Assignee
Valmet Technologies Oy
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 Valmet Technologies Oy filed Critical Valmet Technologies Oy
Publication of EP3910103A1 publication Critical patent/EP3910103A1/fr
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/24—Addition to the formed paper during paper manufacture
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/64—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
    • D04H1/68—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions the bonding agent being applied in the form of foam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/66—Coatings characterised by a special visual effect, e.g. patterned, textured
    • D21H19/70—Coatings characterised by a special visual effect, e.g. patterned, textured with internal voids, e.g. bubble coatings
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/56—Foam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/50—Spraying or projecting

Definitions

  • the invention relates to a method and to a system for applying a substance layer onto a moving fiber web by foam application. More especially the invention relates to a method according to the preamble of claim 1 and to a system according to the preamble of claim 11.
  • fiber web making processes typically comprise an assembly formed by a number of apparatuses arranged consecutively in the process line.
  • a typical production and treatment line comprises a head box, a wire section, and a press section as well as a subsequent drying section and a reel-up.
  • the production and treatment line can further comprise other devices and sections for finishing the fiber web, for example, a sizer, a calender, and a coating section.
  • the production and treatment line also comprises at least one winder for forming customer rolls as well as a roll packaging apparatus.
  • fiber webs are meant for example paper and board webs.
  • various substances are added onto the fiber web in order to achieve the desired end-use properties of the fiber web.
  • the strength and absorption properties of fiber webs can be improved by using sizing by applying sizing agents, such as starch or other glue chemicals, to the web at the wet or dry end of the web production line.
  • sizing agents such as starch or other glue chemicals
  • starch sizing agents
  • coating process a mixture of pigment and binder, usually starch, is applied onto the web usually as a single layer.
  • one or more layers of coating color, i.e. mixture of pigments, binders and other additives is added on the top of the web surface.
  • the main purpose of the coating is to improve the appearance and printability of the web by providing a smooth, flat, and opaque surface.
  • a coating device - In the coating of a fiber web typically a coating device - a coater - is used and in sizing a sizer is used.
  • different kinds of application technologies for application of the substance on the fiber web are employed, for example curtain technology or blade technology or film transfer technology or spray technology or jet technology.
  • the different application technologies and methods have different operating characteristics and operation windows.
  • different application methods set different requirements both for the physical properties and application amounts of the applied substance.
  • the present invention relates to foam application technology, especially by a curtain or a jet type foam application device.
  • a foam coating system comprises typically a chemical dosing and a mixing device, a pumping device, a foaming device, a piping system, and an application unit.
  • the foaming is based on powerful mixing for adding air into the liquid-based substance with a surfactant additive, resulting substantial increase in the specific volume and thus making the handling and application of the coating substance much easier at small dry coat weights.
  • the application unit typically comprises a nozzle or nozzles for applying the foam onto the web.
  • the foam application method is a robust and simple application method and by it also substances comprising solid particles and/or coating color or sizing agent with high viscosity can be applied onto a moving fiber web.
  • a slot-applicator i.e. an application unit with a slot nozzle or slot nozzles, located close to the fiber web.
  • foam application volume flow rate from the nozzle / nozzles varies due to air amount in the foam and due to mass flow of the foam.
  • the foam mass flow depends on the desired running speed and on the desired application amount of substance to be applicated and to used dry content of substance that has been foamed.
  • the air amount in the foam e.g. foam density, depends on desired air content and targeted process effects such as foam penetration to the web. In the foam application, the foam density changes cause high volume flow variations. Thus, window for operation and running parameters of the foam volume flow from the nozzle opening is wide.
  • the foam flow can be selected to be of curtain type or jet type, depending on the desired process conditions.
  • the foam is applied onto the fiber web or onto another target surface, for example onto the surface of a wire or of a belt or of a felt or of a roll, by a vertical nozzle flow at a constant angle.
  • An object of the invention is to provide a method and system for applying a substance layer onto a moving fiber web, in particular onto a paper or a board web using foam application, in which the disadvantages of prior art are eliminated or at least minimized.
  • a particular object of the invention is to provide a method and system for applying a substance layer onto a moving fiber web, in particular onto a paper or a board web, using foam application, in which the disadvantages and problems of into opposite direction to the moving direction of the fiber web moving and accumulating foam, i.e. to back flow, are eliminated or at least minimized.
  • a particular object of the invention is to provide an improved method and system for applying a substance layer onto a moving fiber web, in particular onto a paper or a board web, using foam application, in which the window of the running parameters of the foam application is widened.
  • an angle, in which the foam flow through the nozzle opening meets a target surface is less than 90 degrees, advantageously 30-85 degrees, which target surface is in direct application the surface of the fiber web and in indirect application the surface of a roll or of a belt or of a wire or of a felt or of like.
  • direct foam application the foam is applied directly onto the fiber web and in indirect foam application the foam is first applied onto a surface of a roll or of a belt or of a wire or of a felt or of like, and thereafter via the surface the foam is applied onto the fiber web.
  • the angle is adjustable.
  • the angle is set/adjusted by turning the application device.
  • the angle is set/adjusted by turning the nozzle tip of the application device.
  • the substance in the method is applied onto the fiber web during a run of the fiber web on a roll and the angle is set/adjusted by moving the application device in respect of the roll or in the method the substance is applied onto the fiber web indirectly via a roll and that the angle is set by moving the application device in respect of the roll.
  • the substance is applied onto the fiber web during a run of the fiber web supported by a suction box.
  • the foam flow rate defined by volumetric flow rate or mass flow rate, foam air content or density, running speed of the fiber web and impact angle of the foam flow.
  • the air content of the foam is typically 100-250 g/l, i.e. air content is advantageously 75-90%.
  • At least one layer of the substance in form of foam is applied onto the fiber web one-sidedly or two-sidedly.
  • the substance to be applied in form of foam is sizing or coating agent, which comprises: binder (e.g. starch, synthetic or bio-based polymer latexes, polyvinyl acetate PVA, polyvinyl alcohol PVOH, carboxy methyl cellulose CMC) or mixture of binders, and foaming agents.
  • binder e.g. starch, synthetic or bio-based polymer latexes, polyvinyl acetate PVA, polyvinyl alcohol PVOH, carboxy methyl cellulose CMC
  • the sizing or coating agent may comprise mineral fillers, pigments (e.g. GCC, PCC, kaolin, talc), micro-fibrillated cellulose MFC, nano-fibrillated cellulose NFC, highly refined cellulose.
  • the foam flow is a curtain or a jet type flow.
  • the system for applying a substance layer onto a moving fiber web by foam application directly or indirectly comprises an application device comprising at least one nozzle tip with at least one nozzle opening for a foam flow, wherein the system comprises means configured to set/adjust an angle, in which the foam flow through the nozzle opening meets a target surface, to less than 90 degrees, advantageously 30-85 degrees, which target surface is in direct application the surface of the fiber web and in indirect application the surface of a roll, or of a belt or of a wire or of a felt or of like.
  • the means configured to set/adjust the angle, in which the foam flow meets the target surface comprise a joint mechanism or a turning device.
  • the joint mechanism / the turning device may be an adjustable or configured to be fixed to a selected angle.
  • the means for setting/adjusting the angle, in which the foam flow meets the target surface comprise moving rails or moving levers or arms.
  • the nozzle opening is a substantially full width slot nozzle or a curtain- or a jet- nozzle opening.
  • the foam flow is a curtain or a jet type flow.
  • the nozzle opening is at a distance of 10 - 200 mm, advantageously 20 - 150 mm, more advantageously 30 - 100 mm, from the fiber web / from the target surface.
  • the defined distance provides that the foam flow is not oriented too much towards perpendicular or backward contact angle in relation to the direction of the fiber web / the target surface but instead is forward inclined in the running direction of the fiber web/target surface.
  • This also provides, that capability of avoidance of the back flow is improved, especially in cases where the flow amount of the foam is large and/or the running speed of the fiber web/the target surface is low.
  • disturbances in the foam flow are minimized as the effects of the boundary air layer to the foam flow are minimized. Further, space savings are achieved, which provides advantages in view of constructional details of the system.
  • the system is located at least in one of the following locations: a wire section or a press section or a drying section or a sizing section or a coating section or a calendering section of a fiber web production line.
  • the sizing section, or the coating section or the calendering section can be located on- or off-line.
  • the angle can be set/adjusted by altering the angle of the running direction of the fiber web / of the target surface.
  • the angle of the nozzle flow of the foam is less than 90 degrees, advantageously 30-85 degrees.
  • the angle of the nozzle flow is adjustable.
  • the angle is set/adjusted by turning the application device to the desired angle or turning the nozzle tip of the application device to the desired angle.
  • the angle can be varied in case the application is provided onto the fiber web during its run supported by a roll or in case of indirect application via a roll by moving the application device horizontally above the roll, such that the foam flow meets the roll in a desired angle on the roll surface location.
  • the problem of back flow is avoided as the contact angle of the curtain to the passing fiber web is below 90 degrees, the sizing substance flows in the running direction downstream. Better curtain quality and evenness is achieved.
  • Curtain running window is larger, enabling higher speeds and larger application amounts.
  • the bulkiness of the fiber web is increased when the sizing agent is applied in form of foam.
  • the strength properties, especially ply-bond strength, of the fiber web are improved due to the uniform sizing agent distribution achieved by applying the sizing agent in form of foam.
  • internal strength is improved due to application to the inner structure (i.e. between the plies) and due to good movability and/or penetration of the sizing agent within the fiber web layer in thickness direction.
  • grammage of the fiber web can be decreased as the critical strength properties are achieved by better effect of the sizing agents. Further, good retention is achieved due beneficial application to the inner structure and cost-savings are achieved as smaller amounts of sizing agent are needed as it is applied by foam and thus the sizing agent remains within the fiber web and does not flush away with following water removal steps. Additionally, good runnability properties of the fiber web are achieved as misting and other spreading as well as adherence to rolls and other components of the sizing agent is minimized due to foam application of the sizing agent causing good distribution and stability of the sizing agent.
  • FIGS 1A-1B is shown example of a system for applying a substance layer onto a moving fiber web W directly by foam application.
  • the example is also applicable in indirect application, in which the target surface is a roll, a wire, a belt, a felt or like.
  • the movement direction of the fiber web W is denoted in the figures by an arrow S.
  • the system comprises an application device C10; C20; C30 for foam application.
  • the application device C10; C20; C30 comprises a frame structure 11 with a nozzle tip 15, which nozzle tip 15 has a nozzle opening 16.
  • the nozzle opening 16 is a slot nozzle opening.
  • the application device C10; C20; C30 comprises means 17 for turning the application device C10; C20; C30 such that angle A, in which the foam flow C through the nozzle opening 16 meets the fiber web W, is set/adjusted.
  • the application device C10; C20; C30 can also be mounted to a selected angle A fixedly.
  • the angle A is less than 90 degrees, advantageously 30-85 degrees.
  • the means 17 for turning the application device C10; C20; C30 can be for example a joint mechanism or a turning device. In the figures 1A and 1B are shown examples of two different angles A.
  • FIG 2 is shown another example of a system for applying a substance layer onto a moving fiber web W by direct application by foam application.
  • the example is also applicable in indirect application, in which the target surface is a roll, a wire, a belt, a felt or like.
  • the movement direction of the fiber web W is denoted in the figures by an arrow S.
  • the system comprises an application device C10; C20; C30 for foam application.
  • the application device C10; C20; C30 comprises a frame structure 11 with a nozzle tip 15, which nozzle tip 15 has a nozzle opening 16.
  • the nozzle opening 16 is a slot nozzle opening.
  • the application device C10; C20; C30 comprises means 18 for turning the nozzle tip 15 of application device C10; C20; C30 such that angle A, in which the foam flow C through the nozzle opening 16 meets the fiber web W, is set/adjusted.
  • the angle A is less than 90 degrees, advantageously 30-85 degrees.
  • the means 18 for turning the nozzle tip 15 of the application device C10; C20; C30 can be for example a joint mechanism or a flexible or turnable nozzle tip, or a nonsymmetric nozzle tip.
  • FIG 3 is shown another example of a system for applying a substance layer onto a moving fiber web W directly by foam application.
  • the example is also applicable in indirect application, in which the target surface is a roll, a wire, a belt, a felt or like.
  • the substance is applied onto the moving fiber web W during its run on a roll 25.
  • the movement direction of the fiber web W and the roll 25 is denoted in the figures by an arrow S.
  • the system comprises an application device C10; C20; C30 for foam application.
  • the application device C10; C20; C30 comprises a frame structure 11 with a nozzle tip 15, which nozzle tip 15 has a nozzle opening 16.
  • the nozzle opening 16 is a slot nozzle opening.
  • the application device C10; C20; C30 comprises means 19, 20 for moving and/or turning the application device C10; C20; C30 such that angle A, in which the foam flow C through the nozzle opening 16 meets the fiber web W, is set/adjusted.
  • the angle A is less than 90 degrees, advantageously 30-85 degrees.
  • the means 19, 20 for turning and/ or moving the application device C10; C20; C30 can be for example moving rails or moving levers or arms.
  • FIG 4 is shown an example of a forming section for a multi-ply fiber web W, in this example for a two-ply fiber web W.
  • the forming section comprises a headbox M10; M20 for each layer, from which the stock suspension is fed to the forming unit for each layer W beginning as single wire part comprising a wire 10 for the bottom layer of the multi-ply fiber web W and a wire 20 for the top layer W of the multi-ply fiber web W, each wire comprising rolls 12, 22 for guiding, tensioning and/or driving the wire 10; 20 as an endless loop.
  • the headbox M10; M20 can be single layer or multilayer headbox.
  • the stock suspension is first fed onto the wire 10; 20 and thereafter a fiber web layer W formed of the stock on the wire is guided past inside the loop of the wire 10; 20 located water removal means 11; 15; 21; 25. Inside of the loops of the lower and the upper wire 10; 20 at least one suction means 15; 25 are located.
  • the run of the wire 10; 20 during this water removal on the single wire part is at least in the beginning substantially horizontal.
  • the top fiber web layer W of the multi-ply fiber web guided on the wire 20 is after the single-wire part guided as a downwards run towards the first wire 10 and the runs of the wire 10 for the bottom layer and the wire 20 for the top layer are united by a combining roll 23 to form a twin-wire part and the webs for the bottom layer and the top layer are guided into a gap formed between the wires 10; 20 forming the twin-wire part of the forming unit.
  • Web layers W have been joined together by a combining roll 23 at the beginning of the twin-wire forming part. Combining roll 23 is situated in the top layer wire loop 20.
  • Application devices C10; C20; C30 are located at the angle on the horizontal runs of the lower and the upper wire loop 10; 20 for applying sizing agent advantageously in form of foam by the application device onto the fiber web layer W and to be in between at the layers W of the multi-ply fiber web W in forming section.
  • the angle is less than 90 degrees, advantageously 30-85 degrees.
  • the application device C10; C20 is advantageously located opposite to a inside the wire loop 10, 20 located suction device 15, 25. Also, more than one application devices C10; C20; C30 can be used consecutively for one fiber web layer.
  • the sizing agent applied in form of foam by the application device C10; C20; C30 onto the layer of the web is guided in between the layers.
  • the suction means 11 are provided inside the lower wire loop 10 also after the web layers W are joined by the combining roll 23 at the beginning of the twin-wire forming part in order to assist the conveyance and penetration of the sizing agent into the web layer.
  • the multi-ply fiber web W is guided on the wire 10 supporting the bottom side of the multi-ply fiber web as a single wire part during which run support foils 16 located inside the wire 10 loop.
  • another application device C30 for applying substance in form of foam onto the fiber web W is located at an angle. The angle is less than 90 degrees, advantageously 30-85 degrees.
  • the support foils 16 do not deviate the run of the wire 10 only remove water from the bottom surface of the wire 10 and support the run of the wire 10 as the multi-ply fiber web is guided via suction roll 13 towards a pick-up roll 41 for transferring the multi-ply fiber web to a first press fabric 40 of a press section.
  • the press section also comprises a second press fabric 50 with a roll 51.
  • the press fabrics 40, 50 comprise rolls 42, 52 for guiding, tensioning, and/or driving the fabrics 40; 50 as an endless loop.
  • the multi-ply fiber web is guided between the first press fabric 40 and the second press fabric 50 to a press nip formed between a first press roll 45 and a second press roll 55. Press nip even improves conveyance and penetration of the sizing agent.
  • the fiber web W is guided to a drying section (not shown).
  • At least one layer of the substance in form of foam is applied onto the fiber web one-sidedly or two-sidedly.
EP21170038.0A 2020-05-15 2021-04-23 Procédé et système permettant d'appliquer une couche de substance sur une bande de fibres en mouvement par application de mousse Pending EP3910103A1 (fr)

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Application Number Priority Date Filing Date Title
FI20205491 2020-05-15

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EP3910103A1 true EP3910103A1 (fr) 2021-11-17

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EP21170038.0A Pending EP3910103A1 (fr) 2020-05-15 2021-04-23 Procédé et système permettant d'appliquer une couche de substance sur une bande de fibres en mouvement par application de mousse

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EP (1) EP3910103A1 (fr)
CN (1) CN113668288A (fr)

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EP4245916A1 (fr) * 2022-03-14 2023-09-20 Valmet Technologies Oy Procédé de traitement d'une bande de fibres et système de traitement pour le traitement d'une bande de fibres

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EP2719826A1 (fr) * 2012-10-09 2014-04-16 Metso Paper Inc. Procédé de production d'une bande de fibres et dispositif de production d'une bande de fibres
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US4086377A (en) * 1975-12-09 1978-04-25 Congoleum Corporation Process for applying foam material
US4348251A (en) * 1980-12-19 1982-09-07 American Can Company System for applying binding agents to fibrous webs
US4463583A (en) * 1981-08-08 1984-08-07 Eduard Kusters Apparatus for applying foam
EP1065308A2 (fr) * 1999-06-30 2001-01-03 Gaston Systems, Incorporated Dispositif pour l'application d'un agent de revêtement sous forme de mousse sur une étoffe textile en mouvement
US20040055534A1 (en) * 2002-09-19 2004-03-25 Gaston Systems, Inc. Fluid applicator for permeable substrates
WO2013160564A1 (fr) * 2012-04-26 2013-10-31 Stora Enso Oyj Nappe fibreuse collée de manière hydrophobe et procédé de préparation d'une couche de nappe collée
DE102017128242A1 (de) * 2016-12-07 2018-06-07 Valmet Technologies Oy Verfahren und System zum Auftragen einer Schicht einer Substanz auf eine sich bewegende Faserbahn mittels Schaumauftragung

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4245916A1 (fr) * 2022-03-14 2023-09-20 Valmet Technologies Oy Procédé de traitement d'une bande de fibres et système de traitement pour le traitement d'une bande de fibres

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