EP2841647B1 - Press roll with a roll cover consisting of polyurethane - Google Patents
Press roll with a roll cover consisting of polyurethane Download PDFInfo
- Publication number
- EP2841647B1 EP2841647B1 EP13721295.7A EP13721295A EP2841647B1 EP 2841647 B1 EP2841647 B1 EP 2841647B1 EP 13721295 A EP13721295 A EP 13721295A EP 2841647 B1 EP2841647 B1 EP 2841647B1
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- European Patent Office
- Prior art keywords
- roll
- diisocyanate
- mixture
- roll according
- additive
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Classifications
-
- 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
- D21F3/10—Suction rolls, e.g. couch rolls
- D21F3/105—Covers thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/08—Pressure rolls
Definitions
- the invention relates to a roller, in particular for use in a web-processing and / or finishing machine, such as a paper, board or tissue machine according to the preamble of claim 1.
- the press rolls or suction press rolls used are often coated with polyurethane.
- the dewatering capacity of the press or Saugpresszenzenbezugs depends mainly on the surface design of the roll cover. Usually there are patterns of blind holes and grooves which provide an open volume into which the water squeezed out of the fibrous web can escape.
- suction holes are still available, which pass through the roll shell.
- suction bores for example, water is sucked out of the fibrous web by means of a suction box arranged in an inner volume of the roller.
- a press roll according to the prior art is for example from WO2011 / 015386 where a combination of a press felt with a press roll cover and / or a suction roll cover for a paper machine is described.
- the press roll cover is provided with a circumferential groove surface structure, wherein the proportion of an open surface on the entire surface of the press roll cover is in the range of 20% to 50%.
- a suction press roll is provided which, in addition to the circumferential groove surface structure, is provided with a hole arrangement having a plurality of suction holes completely passing through the suction roll cover, the proportion of an open surface on the whole surface of the suction roll cover is in the range of 30% to 50%.
- additional hole arrangements in the form of blind holes can be provided for both roll shapes.
- the shape, size and arrangement of the surface forms is significantly involved in the quality of the final product.
- a wrong choice of open area can lead to instability of the roll cover as well as to hydraulic or mechanical markings.
- a disadvantage of the press and Saugpresswalzenbegorin known from the prior art is that they are polluted by prolonged use, whereby the surface forms are added by present in the fiber suspension fillers, fiber agglomerates and resin impurities and not more than open volume for the dewatering of the paper web To be available. As a result, the total drainage decreases. Furthermore, unwanted fluctuations in the moisture profile can occur due to uneven contamination.
- the object of the invention is thus to further develop the known press or Saugpresswalzenberat so that the above-mentioned disadvantages can be avoided.
- the functional layer consists of a polyurethane as a polymer, which is a mixture of at least one prepolymer, at least one curing agent and / or at least one crosslinking agent and at least one additive.
- the polymer which forms the roll cover ie an additive is added, which lowers the surface energy of the roll cover, whereby water and dirt do not adhere to the surface of the roll cover and in the surface shapes, but are transported away quickly. This leads to a higher dewatering efficiency of the press roll and thus also of the paper machine. Variations in the moisture transverse profile can be avoided or at least reduced, which increases the quality of the end product.
- the additive is selected from perfluoropolyether or difunctional perfluoropolyether.
- the admixture of the additive is preferably between 1 and 20% by weight. The higher the content of additive, the further the surface energy can be lowered.
- the prepolymer may be a mixture of a polyol and a diisocyanate.
- the polyol may be selected from: polyethers, polyesters, polycarbonates, polycaprolactones.
- the diisocyanate may be an aromatic or an aliphatic diisocyanate or a mixture thereof.
- the aromatic diisocyanate may be selected from: diphenylmethane diisocyanate, toluene diisocyanate or a mixture thereof.
- the aliphatic diisocyanate may be hexamethylene diisocyanate.
- the curing agent and / or the crosslinking agent may be a diamine, a diol or a mixture thereof.
- the curing agent and / or the crosslinking agent may be selected from 4,4'-methylenebis (3-chloro-2,6-diethylanilines) (MCDEA), 4,4'-methylenebis (2-chloroanilines) (MOCA) , 1,4-butanediol, 1,3-propanediol, 1,2-ethanediol, trimethylolpropane or mixtures thereof.
- MCDEA 4,4'-methylenebis (3-chloro-2,6-diethylanilines)
- MOCA 4,4'-methylenebis (2-chloroanilines)
- press and suction press rolls are known to the person skilled in the art.
- rolls usually have a roll core of a metal such as steel or of a fiber composite, which is provided with a single or multi-layer roll cover.
- the latter has an outermost layer, which is also referred to as a functional layer and for which the inventive measures are applicable.
- the connection between the roll core and the roll cover is usually made by a so-called base layer or primer layer. Between this and the functional layer further intermediate layers may be provided.
- a fixed suction box may furthermore be present in the interior of the roll around which the roll shell rotates in a known manner.
- the invention is suitable for use on press and suction press rolls with roller covers, which has a functional layer with common hardness and more common
- the functional layer of the press or suction press roll can be produced, as known to those skilled in the art, for example by a rotational casting process by applying polymer from a nozzle movable along the longitudinal axis of the roll core or roll shell to be coated with uniform rotation of the roll core or shell. After curing, the desired surface structures such as grooves, blind holes, suction holes or combinations thereof are attached and adjusted by grinding the desired surface roughness of about 0.2 to 7.2 Ra.
- a polyurethane is used according to the invention, which consists of a mixture of a prepolymer, a curing agent and / or a crosslinking agent with the addition of an additive for modification.
- the prepolymer is prepared from a polyol such as polyether, polyester, polycarbonate or polycaprolactone and a curing agent such as an aromatic and aliphatic diisocyanate.
- a polyol such as polyether, polyester, polycarbonate or polycaprolactone
- a curing agent such as an aromatic and aliphatic diisocyanate.
- aromatic hardener for example, diphenylmethane diisocyanate or toluene diisocyanate is suitable, while as aliphatic hardener, as e.g. Hexamethylene diisocyanate offers.
- Suitable chain extenders or crosslinkers are diamines such as 4,4'-methylenebis (3-chloro-2,6-diethylanilines) (MCDEA) or 4,4'-methylenebis (2-chloroanilines) (MOCA) and short-chain ones Diols such as 1,4-butanediol, 1,2-ethanediol, 1,3-propanediol or trifunctional products such as trimethylolpropane.
- MCDEA 4,4'-methylenebis (3-chloro-2,6-diethylanilines)
- MOCA 4,4'-methylenebis (2-chloroanilines)
- Diols such as 1,4-butanediol, 1,2-ethanediol, 1,3-propanediol or trifunctional products such as trimethylolpropane.
- Suitable additives for the modification of the polyurethane are various substance classes in various states of aggregation such as, for example, perfluoropolyethers (trade name eg polysec c, liquid), polytetrafluoroethylene (PTFE, trade name eg Osixo, pulverulent), polyethylene (trade name eg Inhance UH-1250, particulate) or bifunctional perfluoropolyether (trade name eg Fluorolink, liquid).
- the additive is selected from perfluoropolyether or difunctional perfluoropolyether.
- additives 1 to 20% by weight may be added to obtain a modification of the polyurethane in the desired manner. Since the surface energy decreases with increasing additive content, the highest possible additive content is desirable. A limit is set only by the cost of the additive, which are experience very high.
Landscapes
- Paper (AREA)
- Polyurethanes Or Polyureas (AREA)
Description
Die Erfindung betrifft eine Walze insbesondere zur Verwendung in einer bahnverarbeitenden und/oder -veredelnden Maschine wie einer Papier-, Karton- oder Tissuemaschine nach dem Oberbegriff von Anspruch 1.The invention relates to a roller, in particular for use in a web-processing and / or finishing machine, such as a paper, board or tissue machine according to the preamble of claim 1.
In den o.g. Maschinen werden in der Pressenpartie gewöhnlich Presswalzen oder Saugpresswalzen eingesetzt, welche nach einer Erstentwässerung in der Formierpartie weitere Flüssigkeit aus der Faserstoffbahn insbesondere durch mechanischen Druck und/oder durch Absaugung entziehen.In the o.g. Machines are usually used in the press section press rolls or suction press rolls, which withdraw after a Erstentwässerung in the Formierpartie further liquid from the fibrous web, in particular by mechanical pressure and / or by suction.
Die eingesetzten Presswalzen oder Saugpresswalzen sind häufig mit Polyurethan beschichtet. Die Entwässerungskapazität des Press- oder Saugpresswalzenbezugs hängt dabei hauptsächlich vom Oberflächendesign des Walzenbezugs ab. Gewöhnlich sind Muster aus Blindbohrungen und Rillen vorhanden, welche ein offenes Volumen zur Verfügung stellen, in welches das aus der Faserstoffbahn ausgepresste Wasser ausweichen kann.The press rolls or suction press rolls used are often coated with polyurethane. The dewatering capacity of the press or Saugpresszenzenbezugs depends mainly on the surface design of the roll cover. Usually there are patterns of blind holes and grooves which provide an open volume into which the water squeezed out of the fibrous web can escape.
Im Fall von Saugpresswalzen sind gewöhnlich zusätzlich noch Saugbohrungen vorhanden, welche den Walzenmantel durchgreifen. Durch die Saugbohrungen wird beispielsweise mittels eines in einem Innenvolumen der Walze angeordneten Saugkastens Wasser aus der Faserstoffbahn abgesaugt.In the case of Saugpresswalzen usually suction holes are still available, which pass through the roll shell. By means of the suction bores, for example, water is sucked out of the fibrous web by means of a suction box arranged in an inner volume of the roller.
Eine Presswalze gemäß dem Stand der Technik ist beispielsweise aus der
Die Form, Größe und Anordnung der Oberflächenformen ist maßgeblich an der Qualität des Endproduktes beteiligt. Eine falsche Wahl der offenen Fläche kann zu Instabilität des Walzenbezugs sowie zu hydraulischen oder mechanischen Markierungen führen.The shape, size and arrangement of the surface forms is significantly involved in the quality of the final product. A wrong choice of open area can lead to instability of the roll cover as well as to hydraulic or mechanical markings.
Nachteilig an den aus dem Stand der Technik bekannten Press- und Saugpresswalzenbezügen ist insbesondere, dass sie durch langen Gebrauch verschmutzen, wodurch die Oberflächenformen durch in der Fasersuspension vorhandene Füllstoffe, Faseragglomerate und Harzverunreinigungen zugesetzt werden und nicht mehr als offenes Volumen für die Entwässerung der Papierbahn zur Verfügung stehen. In der Folge sinkt die Gesamtentwässerung. Weiters können unerwünschte Schwankungen im Feuchtequerprofil durch ungleichmäßige Verschmutzung auftreten.A disadvantage of the press and Saugpresswalzenbezügen known from the prior art is that they are polluted by prolonged use, whereby the surface forms are added by present in the fiber suspension fillers, fiber agglomerates and resin impurities and not more than open volume for the dewatering of the paper web To be available. As a result, the total drainage decreases. Furthermore, unwanted fluctuations in the moisture profile can occur due to uneven contamination.
Mechanische Reinigungsvorrichtungen liefern als Abhilfe nur unzureichende Ergebnisse zur Konditionierung von Walzenbezügen, da beispielsweise durch Schaber und Bürsten die Bohrungen nicht gereinigt werden können, während die Behandlung der Walze mit Waschlösungen zum Eintrag von unerwünschten Stoffen in die Faserstoffbahn und zum Rewetting derselben führen können.Mechanical cleaning devices provide as a remedy only insufficient results for the conditioning of roll covers, as for example by scrapers and brushes, the holes can not be cleaned, while the treatment of the roller with wash solutions for the entry of unwanted substances in the fibrous web and Rewetting can lead to the same.
Aufgabe der Erfindung ist es somit, die bekannten Press- oder Saugpresswalzenbezüge so weiterzubilden, dass die oben genannten Nachteile vermieden werden können.The object of the invention is thus to further develop the known press or Saugpresswalzenbezüge so that the above-mentioned disadvantages can be avoided.
Die Aufgabe wird durch die kennzeichnenden Merkmale von Anspruch 1 in Verbindung mit den gattungsbildenden Merkmalen gelöst.The object is achieved by the characterizing features of claim 1 in conjunction with the generic features.
Erfindungsgemäß ist dabei vorgesehen, dass die Funktionsschicht aus einem Polyurethan als Polymer besteht, welches eine Mischung aus zumindest einem Präpolymer, zumindest einem Härter und/oder zumindest einem Vernetzungsmittel und zumindest einem Additiv ist. Dem Polymer, welches den Walzenbezug bildet, wird also ein Additiv beigemischt wird, welches die Oberflächenenergie des Walzenbezuges senkt, wodurch Wasser und Schmutz nicht an der Oberfläche des Walzenbezugs sowie in den Oberflächenformen haften bleiben, sondern rasch abtransportiert werden. Dies führt zu einer höheren Entwässerungseffizienz der Presswalze und somit auch der Papiermaschine. Schwankungen im Feuchtequerprofil können vermieden oder zumindest reduziert werden, was die Qualität des Endproduktes steigert.According to the invention, it is provided that the functional layer consists of a polyurethane as a polymer, which is a mixture of at least one prepolymer, at least one curing agent and / or at least one crosslinking agent and at least one additive. The polymer which forms the roll cover, ie an additive is added, which lowers the surface energy of the roll cover, whereby water and dirt do not adhere to the surface of the roll cover and in the surface shapes, but are transported away quickly. This leads to a higher dewatering efficiency of the press roll and thus also of the paper machine. Variations in the moisture transverse profile can be avoided or at least reduced, which increases the quality of the end product.
Überraschenderweise wurde festgestellt, dass auch die Hydrolysebeständigkeit, die chemische Beständigkeit und die mechanischen Eigenschaften der erfindungsgemäßen Funktionsschicht durch das beschriebene Polymer signifikant verbessert werden.It has surprisingly been found that the hydrolysis resistance, the chemical resistance and the mechanical properties of the functional layer according to the invention are significantly improved by the polymer described.
Weitere vorteilhafte Ausgestaltungsvarianten und weiterführende Merkmale gehen aus den abhängigen Ansprüchen hervor.Further advantageous embodiment variants and further features will become apparent from the dependent claims.
Gemäß der Erfindung ist das Additiv aus Perfluoropolyether oder bifunktionellem Perfluorpolyether ausgewählt.According to the invention, the additive is selected from perfluoropolyether or difunctional perfluoropolyether.
Bevorzugt beträgt die Beimengung des Additivs zwischen 1 und 20 Gewichts-%. Je höher der Gehalt an Additiv, desto weiter kann die Oberflächenenergie gesenkt werden.The admixture of the additive is preferably between 1 and 20% by weight. The higher the content of additive, the further the surface energy can be lowered.
Vorteilhafterweise kann das Präpolymer eine Mischung aus einem Polyol und einem Diisocyanat sein.Advantageously, the prepolymer may be a mixture of a polyol and a diisocyanate.
Bevorzugt kann das Polyol ausgewählt sein aus: Polyether, Polyester, Polycarbonate, Polycaprolactone.Preferably, the polyol may be selected from: polyethers, polyesters, polycarbonates, polycaprolactones.
Das Diisocyanat kann ein aromatisches oder ein aliphatisches Diisocyanat oder eine Mischung daraus sein. Das aromatische Diisocyanat kann ausgewählt sein aus: Diphenylmethandiisocyanat, Toluoldiisocyanat oder eine Mischung daraus. Das aliphatische Diisocyanat kann Hexamethylendiisocyanat sein.The diisocyanate may be an aromatic or an aliphatic diisocyanate or a mixture thereof. The aromatic diisocyanate may be selected from: diphenylmethane diisocyanate, toluene diisocyanate or a mixture thereof. The aliphatic diisocyanate may be hexamethylene diisocyanate.
Gemäß einer weiteren vorteilhaften Weiterbildung der Erfindung kann der Härter und/oder das Vernetzungsmittel ein Diamin, ein Diol oder eine Mischung daraus sein.According to a further advantageous embodiment of the invention, the curing agent and / or the crosslinking agent may be a diamine, a diol or a mixture thereof.
Bevorzugt kann der Härter und/oder das Vernetzungsmittel ausgewählt sein aus 4,4'-Methylene-bis-(3-chloro-2,6-diethylaniline) (MCDEA), 4,4'-Methylenebis(2-chloroaniline) (MOCA), 1,4 Butandiol, 1,3Propandiol, 1,2 Ethandiol, Trimethylolpropan oder Mischungen daraus.Preferably, the curing agent and / or the crosslinking agent may be selected from 4,4'-methylenebis (3-chloro-2,6-diethylanilines) (MCDEA), 4,4'-methylenebis (2-chloroanilines) (MOCA) , 1,4-butanediol, 1,3-propanediol, 1,2-ethanediol, trimethylolpropane or mixtures thereof.
Im Folgenden wird die Erfindung näher erläutert.The invention will be explained in more detail below.
Auf eine ausführliche Beschreibung des Walzenaufbaus kann an dieser Stelle verzichtet werden, da Press- und Saugpresswalzen dem Fachmann bekannt sind. Generell weisen derartige Walzen gewöhnlich einen Walzenkern aus einem Metall wie Stahl oder auch aus einem Faserverbundwerkstoff auf, welcher mit einem ein- oder mehrschichtigen Walzenbezug versehen wird. Letzterer weist eine äußerste Schicht auf, welche auch als Funktionsschicht bezeichnet wird und für welche die erfindungsgemäßen Maßnahmen anwendbar sind. Die Verbindung zwischen dem Walzenkern und dem Walzenbezug wird gewöhnlich durch einen sogenannten Baselayer oder Haftvermittlungsschicht hergestellt. Zwischen diesem und der Funktionsschicht können weitere Zwischenschichten vorgesehen sein.A detailed description of the roll construction can be dispensed with at this point, since press and suction press rolls are known to the person skilled in the art. Generally, such rolls usually have a roll core of a metal such as steel or of a fiber composite, which is provided with a single or multi-layer roll cover. The latter has an outermost layer, which is also referred to as a functional layer and for which the inventive measures are applicable. The connection between the roll core and the roll cover is usually made by a so-called base layer or primer layer. Between this and the functional layer further intermediate layers may be provided.
Handelt es sich um eine besaugte Presswalze, kann weiterhin in bekannter Weise ein feststehender Saugkasten im Inneren der Walze vorhanden sein, um welchen der Walzenmantel rotiert.If it is an evacuated press roll, a fixed suction box may furthermore be present in the interior of the roll around which the roll shell rotates in a known manner.
Die Erfindung ist für die Anwendung auf Press- und Saugpresswalzen mit Walzenbezügen geeignet, die eine Funktionsschicht mit gängiger Härte und gängigerThe invention is suitable for use on press and suction press rolls with roller covers, which has a functional layer with common hardness and more common
Oberflächenrauigkeit aufweisen, wie sie üblicherweise in Papier-, Karton- oder Tissuemaschinen Verwendung finden.Surface roughness, as they are commonly used in paper, board or tissue machines use.
Die Funktionsschicht der Press- oder Saugpresswalze kann dabei wie dem Fachmann bekannt beispielsweise durch ein Rotationsgussverfahren hergestellt werden, indem Polymer aus einer entlang der Längsachse des zu beschichtenden Walzenkerns oder Walzenmantels verfahrbaren Düse unter gleichmäßiger Rotation des Walzenkerns oder -mantels aufgetragen wird. Nach Aushärtung werden die gewünschten Oberflächenstrukturen wie Rillen, Blindbohrungen, Saugbohrungen oder Kombinationen daraus angebracht sowie durch Schleifen die gewünschte Oberflächenrauhigkeit von ca. 0,2 bis 7,2 Ra eingestellt.The functional layer of the press or suction press roll can be produced, as known to those skilled in the art, for example by a rotational casting process by applying polymer from a nozzle movable along the longitudinal axis of the roll core or roll shell to be coated with uniform rotation of the roll core or shell. After curing, the desired surface structures such as grooves, blind holes, suction holes or combinations thereof are attached and adjusted by grinding the desired surface roughness of about 0.2 to 7.2 Ra.
Als Polymer für die Funktionsschicht des Walzenbezugs wird erfindungsgemäß ein Polyurethan verwendet, welches als Mischung aus einem Präpolymer, einem Härter und/oder einem Vernetzungsmittel unter Beigabe eines Additivs zur Modifikation besteht.As a polymer for the functional layer of the roll cover, a polyurethane is used according to the invention, which consists of a mixture of a prepolymer, a curing agent and / or a crosslinking agent with the addition of an additive for modification.
Das Präpolymer wird dabei aus einem Polyol wie beispielsweise Polyether, Polyester, Polycarbonat oder Polycaprolacton und einem Härter wie einem aromatischen und aliphatischen Diisocyanat hergestellt. Als aromatischer Härter kommt beispielsweise Diphenylmethandiisocyanat oder Toluoldiisocyanat in Frage, während als sich als aliphatischer Härter z.B. Hexamethylendiisocyanat anbietet.The prepolymer is prepared from a polyol such as polyether, polyester, polycarbonate or polycaprolactone and a curing agent such as an aromatic and aliphatic diisocyanate. As the aromatic hardener, for example, diphenylmethane diisocyanate or toluene diisocyanate is suitable, while as aliphatic hardener, as e.g. Hexamethylene diisocyanate offers.
Als Kettenverlängerer bzw. -vernetzer eignen sich Diamine wie 4,4'-Methylene-bis-(3-chloro-2,6-diethylaniline) (MCDEA) oder 4,4'-Methylenebis(2-chloroaniline) (MOCA) sowie kurzkettige Diole wie 1,4 Butandiol, 1,2 Ethandiol, 1,3 Propandiol oder trifunktionelle Produkte wie Trimethylolpropan.Suitable chain extenders or crosslinkers are diamines such as 4,4'-methylenebis (3-chloro-2,6-diethylanilines) (MCDEA) or 4,4'-methylenebis (2-chloroanilines) (MOCA) and short-chain ones Diols such as 1,4-butanediol, 1,2-ethanediol, 1,3-propanediol or trifunctional products such as trimethylolpropane.
Als Additive zur Modifikation des Polyurethans eignen sich diverse Stoffklassen in verschiedenen Aggregatzuständen wie beispielsweise Perfluoropolyether (Handelsname z.B. Polysec c, flüssig), Polytetrafluorethylen (PTFE; Handelsname z.B. Osixo, pulverförmig), Polyethylen (Handelsname z.B. Inhance UH-1250, partikelförmig) oder bifunktioneller Perfluorpolyether (Handelsname z.B. Fluorolink, flüssig). Gemäß der Erfindung ist das Additiv jedoch aus Perfluoropolyether oder bifunktionellem Perfluorpolyether ausgewählt.Suitable additives for the modification of the polyurethane are various substance classes in various states of aggregation such as, for example, perfluoropolyethers (trade name eg polysec c, liquid), polytetrafluoroethylene (PTFE, trade name eg Osixo, pulverulent), polyethylene (trade name eg Inhance UH-1250, particulate) or bifunctional perfluoropolyether (trade name eg Fluorolink, liquid). However, according to the invention, the additive is selected from perfluoropolyether or difunctional perfluoropolyether.
Von diesen Additiven können 1 bis 20 Gewichts-% zugegeben werden, um eine Modifizierung des Polyurethans in der gewünschten Weise zu erhalten. Da die Oberflächenenergie mit steigendem Additivgehalt sinkt, ist ein möglichst hoher Additivgehalt wünschenswert. Eine Grenze ist dabei lediglich durch die Kosten des Additivs gesetzt, welche erfahrungsgemäß sehr hoch sind.Of these additives, 1 to 20% by weight may be added to obtain a modification of the polyurethane in the desired manner. Since the surface energy decreases with increasing additive content, the highest possible additive content is desirable. A limit is set only by the cost of the additive, which are experience very high.
Neben der Senkung der Oberflächenenergie und der daraus resultierenden reduzierten Schmutz- und Wasseranhaftung konnte überraschenderweise auch eine verbesserte Hydrolysebeständigkeit und chemische Beständigkeit sowie eine Verbesserung der mechanischen Eigenschaften an erfindungsgemäß ausgeführten Walzenbezügen beobachtet werden.In addition to the reduction of the surface energy and the resulting reduced soil and water adhesion, it was surprisingly also possible to observe an improved resistance to hydrolysis and chemical resistance as well as an improvement in the mechanical properties of roll covers designed according to the invention.
Claims (8)
- Roll for a press section of a machine for making and/or finishing a fibrous web such as a paper, board or tissue machine, comprising a roll body or roll sleeve and a roll cover arranged on the roll body or roll sleeve and displaying at least one functional layer adapted to contact the fibrous web or a paper machine clothing fabric, wherein the functional layer consists of a polyurethane which is a mixture of at least one prepolymer, at least one curative and/or at least one crosslinker and at least one additive, characterized in that the additive is selected from: perfluoropolyether or bifunctional perfluoropolyether.
- Roll according to Claim 1, characterized in that the amount of the additive added is in the range from 1% to 20% by weight.
- Roll according to either of Claims 1 and 2, characterized in that the prepolymer is a mixture of a polyol and a diisocyanate.
- Roll according to Claim 3, characterized in that the polyol is selected from: polyethers, polyesters, polycarbonates, polycaprolactones.
- Roll according to Claim 3 or 4, characterized in that the diisocyanate is an aromatic diisocyanate or an aliphatic diisocyanate or a mixture thereof.
- Roll according to Claim 5, characterized in that the aromatic diisocyanate is selected from: diphenylmethane diisocyanate, tolylene diisocyanate or a mixture thereof, and in that the aliphatic diisocyanate is hexamethylene diisocyanate.
- Roll according to any one of Claims 1 to 6, characterized in that the curative and/or the crosslinker is a diamine, a diol or a mixture thereof.
- Roll according to Claim 7, characterized in that the curative and/or the crosslinker is selected from 4,4'-methylenebis(3-chloro-2,6-diethylaniline) (MCDEA), 4,4'-methylenebis(2-chloroaniline) (MOCA), 1,4-butanediol, 1,3-propanediol, 1,2-ethanediol, trimethylolpropane or mixtures thereof.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012207059 | 2012-04-27 | ||
| PCT/EP2013/058512 WO2013160358A1 (en) | 2012-04-27 | 2013-04-24 | Press roll with a roll cover consisting of polyurethane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2841647A1 EP2841647A1 (en) | 2015-03-04 |
| EP2841647B1 true EP2841647B1 (en) | 2017-11-15 |
Family
ID=48326266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13721295.7A Active EP2841647B1 (en) | 2012-04-27 | 2013-04-24 | Press roll with a roll cover consisting of polyurethane |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9267235B2 (en) |
| EP (1) | EP2841647B1 (en) |
| CN (1) | CN104334796B (en) |
| WO (1) | WO2013160358A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015216503A1 (en) * | 2015-08-28 | 2017-03-02 | Voith Patent Gmbh | Roll cover and applicator roll comprising such |
| DE102016201344A1 (en) * | 2016-01-29 | 2017-08-03 | Voith Patent Gmbh | Press cover and method for producing such |
| DE102016114013A1 (en) * | 2016-07-29 | 2018-02-01 | Voith Patent Gmbh | Roll cover and roller and their use |
| FI128303B (en) * | 2017-11-28 | 2020-03-13 | Valmet Technologies Oy | Roll and its use |
| DE102018118052A1 (en) * | 2018-07-26 | 2020-01-30 | Voith Patent Gmbh | Coat, its use for an spreader roller and spreader roller |
| DE102018122778A1 (en) * | 2018-09-18 | 2020-03-19 | Voith Patent Gmbh | Process for producing a jacket for an spreader roll, spreader roll and use of such |
| DE102018122782A1 (en) * | 2018-09-18 | 2020-03-19 | Voith Patent Gmbh | Press jacket, its use as well as press roll and shoe press |
| EP4045707A1 (en) * | 2019-10-15 | 2022-08-24 | Valmet Technologies Oy | Roll cover and its use |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013037525A1 (en) * | 2011-09-16 | 2013-03-21 | Voith Patent Gmbh | Roller with roller cover |
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| CN1017637B (en) * | 1985-04-23 | 1992-07-29 | 美商贝洛特公司 | Urethane covered paper machine roll |
| FI80097B (en) * | 1988-04-28 | 1989-12-29 | Valmet Paper Machinery Inc | VALS I PRESSPARTIET AV EN PAPPERSMASKIN OCH FOERFARANDE FOER FRAMSTAELLNING AV DENNA. |
| US5895806A (en) * | 1996-05-06 | 1999-04-20 | Uniroyal Chemical Company, Inc. | Polyurethane composition useful for coating cylindrical parts |
| US5837359A (en) * | 1996-06-03 | 1998-11-17 | The Mearl Corporation | Satin and tinted satin iridescent films |
| US6027769A (en) * | 1998-08-24 | 2000-02-22 | Gajewski; Vincent J. | Method for producing cylindrical objects of multilayer dissimilar compositions without interfaces |
| EP2118164A2 (en) * | 2006-12-18 | 2009-11-18 | Voith Patent GmbH | Roller cover and method for the production thereof |
| DE102007000505A1 (en) * | 2007-10-15 | 2009-04-16 | Voith Patent Gmbh | Roller coating for roller for treating paper, cardboard, tissue or other fibrous material web in machine, comprises polyurethane elastomer, filler and fiber material |
| DE102009028215B3 (en) | 2009-08-04 | 2010-09-09 | Voith Patent Gmbh | Combination of a press felt with a press roll cover and / or a suction roll cover for a paper machine |
| FI20096355A0 (en) * | 2009-12-18 | 2009-12-18 | Metso Paper Inc | COATING APPLICABLE TO PART OF FIBER MACHINE MACHINE |
| FI20115400A (en) * | 2011-04-26 | 2012-10-27 | Metso Paper Inc | Roll coating and process for making it |
-
2013
- 2013-04-24 CN CN201380022210.4A patent/CN104334796B/en active Active
- 2013-04-24 EP EP13721295.7A patent/EP2841647B1/en active Active
- 2013-04-24 WO PCT/EP2013/058512 patent/WO2013160358A1/en active Application Filing
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2014
- 2014-10-27 US US14/524,312 patent/US9267235B2/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013037525A1 (en) * | 2011-09-16 | 2013-03-21 | Voith Patent Gmbh | Roller with roller cover |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2841647A1 (en) | 2015-03-04 |
| CN104334796B (en) | 2017-06-13 |
| CN104334796A (en) | 2015-02-04 |
| WO2013160358A1 (en) | 2013-10-31 |
| US20150041093A1 (en) | 2015-02-12 |
| US9267235B2 (en) | 2016-02-23 |
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