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WO2018019814A1 - Procédé de revêtement d'un cylindre de séchage - Google Patents

Procédé de revêtement d'un cylindre de séchage Download PDF

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Publication number
WO2018019814A1
WO2018019814A1 PCT/EP2017/068729 EP2017068729W WO2018019814A1 WO 2018019814 A1 WO2018019814 A1 WO 2018019814A1 EP 2017068729 W EP2017068729 W EP 2017068729W WO 2018019814 A1 WO2018019814 A1 WO 2018019814A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
drying
drying cylinder
drying device
fibrous web
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.)
Ceased
Application number
PCT/EP2017/068729
Other languages
German (de)
English (en)
Inventor
Franz Grohmann
Alexander Etschmaier
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
Priority to CN201780045131.3A priority Critical patent/CN109477303A/zh
Priority to EP17743036.0A priority patent/EP3491188B1/fr
Priority to US16/320,614 priority patent/US20190186076A1/en
Publication of WO2018019814A1 publication Critical patent/WO2018019814A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • D21F5/021—Construction of the cylinders

Definitions

  • the invention is based on a method for coating a drying cylinder of a drying device, which may be part of a machine for producing and / or finishing a fibrous web, such as a paper, board or tissue web.
  • Generic drying cylinders are equipped with coated surfaces. They may be associated with a heating device, by means of which the drying cylinders can be heated, and in particular serve for smoothing and / or drying of the fibrous web previously produced in the machine. Depending on the application, these drying cylinders are subject on the one hand considerable corrosion due to the environment to which they are exposed. They come directly or indirectly with the fibrous web and the additives contained therein, such as chemicals in contact, are exposed to high ambient temperatures and must have a very high abrasion resistance, since on its outer circumference directly or indirectly the fibrous web or such fibrous web leading clothing (eg conveyor belts) running.
  • a heating device by means of which the drying cylinders can be heated, and in particular serve for smoothing and / or drying of the fibrous web previously produced in the machine.
  • these drying cylinders are subject on the one hand considerable corrosion due to the environment to which they are exposed. They come directly or indirectly with the fibrous web and the additives contained therein, such as chemicals in contact, are exposed to high
  • the conventional thermally sprayed coatings with the coated substrate such as the drying cylinder, only mechanically clamped. Therefore, the coatings thus obtained are not particularly resistant to corrosion due to "only" such bracing. This is particularly critical when using chemicals, as explained above.
  • the materials used to date of the coatings achieve enormous one Abrasion resistance, but are less ductile and relatively brittle. The coatings can therefore detach from the substrate.
  • older, to the limits of the lifetime encountered drying cylinders had to be retired. The reason for this is that the existing, worn coating must be removed before recoating. For this purpose, the drying cylinder is usually abraded down to the roll core on which the coating is applied.
  • the present invention relates to such generic objects.
  • the object is achieved by a method for coating a drying cylinder having the features of claim 1.
  • the coating takes place within the drying device itself.
  • the drying cylinder within the boundary of the drying device (eg within the housing), (ie without having to remove it from the drying device, (re)) is coated in the drying device .
  • the coating of the drying cylinder is preferably carried out in a non-operating state of the drying device. This can be achieved, for example, by the fact that the coating system necessary for this also at least temporarily within the boundary of the drying device is arranged or can be brought in such a position. In other words, at least temporarily, a system consists of a drying device and the coating system.
  • the melting of at least the applied spray additive material takes place by means of a jet
  • the jet - in the sense of laser spraying - on the one hand can only melt the spray additive material or, on the other hand, that the jet source is set up in this way is that the beam - in the sense of Lasercladdings - in addition to the spray additive material at the same time the substrate to be coated, ie, for example, the lateral surface of the drying cylinder to be coated or the roll body is able to melt.
  • the beam source can be correspondingly adjustable, for example, with respect to its power (eg, track energy), beam geometry, or focusing of the beam.
  • the substrate to be coated for example the roll body (or the jacket surface of the drying cylinder to be coated) and the coating to be applied thereto, are at least partially made of a metal, then these may be due to the laser cladding form an alloy:
  • the energy or power of the beam source can be so dimensioned that the temperature of the melt of both molten metals above the highest occurring temperature of the liquidus lies in a state diagram of an alloy to be formed from these two metals.
  • a beam source is set up for laser cladding, if it is capable of partially melting the lateral surface, eg the roller core, of the adhesive or functional layer arranged thereon during the production of the coating according to the invention.
  • propagation direction is meant the spatial direction of the beam, which extends away from the beam source on the jacket surface to be coated. It can be defined by spatial vectors in an eg Cartesian coordinate system to be discribed. If, after leaving the beam source, the beam is deflected in the direction of the lateral surface to be coated, then the term propagation direction means the actually traveled path (beam path) of the beam.
  • the drying device dries and / or smoothes a fibrous web during normal operation (operating state). It may be part of an aforementioned machine for producing and / or finishing a fibrous web such as a paper, board or tissue web.
  • a fibrous web such as a paper, board or tissue web.
  • it has at least one drying cylinder.
  • a plurality of drying cylinders is provided. These are arranged in the direction of the drying and / to be smoothed, extending through them fibrous web with respect to their longitudinal axes parallel to each other. In the latter case, the fibrous web wraps around each individual drying cylinder alternately in the running direction in a corresponding looping area.
  • a drying cylinder means a heatable or heated drying cylinder, such as a Yankee cylinder.
  • the term drying cylinder may also include a calender roll.
  • a brand new, first produced drying cylinder usually has a roll core and a coating applied immediately thereafter. The coating wears over time, requiring recoating. If, according to the invention, therefore, mention is made of drying cylinders, this always means a drying cylinder with a roll core and a coating (new or existing, eg partially worn) coating.
  • Such drying cylinders for treating a fibrous web measure several meters both in length and in diameter.
  • a drying and / or smoothing of the fibrous web is not possible.
  • the fibrous web will not more led around the drying cylinder and no longer wraps around this.
  • the coating of the drying cylinder according to the invention is carried out in the non-operating state of the drying device.
  • the coating system according to the invention has its intended condition (operating state of the coating system).
  • the coater is in a non-operational condition when the dryer is in its operating condition. Coating system and drying device are thus seen in their normal operation thus operated in opposite directions.
  • the fibrous web is in direct or indirect contact with the drying cylinder during operation of the dryer, for example via a string.
  • the fibrous web runs in the same direction of rotation of the rotationally driven about the longitudinal axis of the drying cylinder together with this.
  • the wrapping area is that portion of the circular arc of the drying cylinder - in each case starting from a dormant observer looking in side view on the axis of rotation of the drying cylinder - which is (at least partially) wrapped by the fibrous web.
  • the wrapping area can be limited by two pick-up points at which the fibrous web is given on the one hand on the drying cylinder in the normal operation of the drying cylinder and on the other hand again removed from it.
  • the at least one take-off point can be formed by a press nip, which form a press roll and the drying cylinder together.
  • One of the two pick-up points can also be formed by a creping doctor, which is pressed against the lateral surface of the drying cylinder - when the drying cylinder is designed as Yankee cylinder - to remove the fibrous web from the drying cylinder (to creping).
  • a region of the drying cylinder located outside the wrapping region of the fibrous web is also referred to below as the coating application region.
  • the fibrous web is not in contact with the drying cylinder. It is - in top view seen on the longitudinal axis of the drying cylinder - for example, that remaining part of the arc of the drying cylinder, which preferably results after deduction of limited by the loop portion arc of the full circle of the drying cylinder, each seen in the above side view.
  • the coating application area may be the area corresponding to the circular arc swept by the fibrous web in the direction of rotation of the drying cylinder.
  • the wrapping area consequently corresponds to a part of the full surface area of the drying cylinder, viewed in the circumferential direction.
  • the coating application area corresponds to the difference between the part of the lateral surface spanned by the wrap area and the full lateral surface of the drying cylinder.
  • the coating application area is also the spatial area to which the beam is directed during normal operation of the coating installation or with which the coating according to the invention is applied to the drying cylinder.
  • This arrangement of the coating system within the drying device has the advantage that the coating system can remain in the drying device even in its non-operating state (ie in the operating state of the drying device) without it interfering with the treatment of the fibrous web. This eliminates corresponding reconstruction work, which would lead to a standstill of the drying device, whereby the operating costs of the drying device can be reduced. On the other hand, the coating system can be used immediately again for a later recoating.
  • a fibrous web is a scrim of fibers, such as cellulose fibers, plastic fibers, glass fibers, carbon fibers, To understand additives, additives or the like.
  • the fibrous web may be formed, for example, as a paper, cardboard or tissue web. It may essentially comprise cellulose fibers, with small amounts of other fibers or else additives and additives being present. Depending on the application, this is left to the skilled person.
  • the coating of the invention is preferably carried out permanently.
  • a durable coating in the sense of the invention is a solid state (solidified) in the operating state of the drying device and preferably in one piece with the drying cylinder. Not under the term permanently thus fall in the operating state of the drying device in liquid or pasty form, not integral with the drying cylinder (permanently) associated temporary coatings such as paints, glazes or paints, for example, by chemical bonding to the drying cylinder (temporarily) adhere.
  • a material-locking connection results between the drying cylinder or its roll core and the coating.
  • Durable also means that the coating remains permanently connected to the drying cylinder or its roll core over its lifetime in the operating state of the drying device, and this over a plurality of revolutions of the drying cylinder. Durable therefore means that the coating does not have to be reapplied after every full revolution of the drying cylinder over its lifetime.
  • the coating may be selected such that it has such a relatively high abrasion resistance against articles passing through it in frictional engagement, such as the fibrous web, a fabric carrying the fibrous web, or a cleaning or creping doctor abutting the shell surface of the drying cylinder.
  • the abrasion resistance can be chosen so high that a service life of several hundred hours is achieved in the intended operating condition of the drying device with the coating of the drying cylinder. And this without having to renew the coating.
  • the coating according to the invention takes place within the drying device, ie in situ.
  • the latter can mean that the coating of the drying cylinder preferably takes place within the geometric limitation of the drying device, within the housing wall of the drying device.
  • a coating system according to the invention is accommodated, for example, correspondingly within the housing wall of the drying device. This has the advantage that the drying cylinder does not have to be removed from the drying device for its recoating. Rather, it remains in its place, which it occupies anyway in the operating state of the drying device.
  • material is basically the starting material from which the coating, e.g. the adhesive or functional layer is to be produced, understood.
  • the spray additive material means that starting material which is applied to the substrate to be coated (in this case the roll core or the lateral surface of the drying cylinder) for the purpose of producing the corresponding layer.
  • the primary application direction of the spray additive material is that direction which corresponds to the (statistically most frequently occurring) main component of movement of the spray additive material supplied to the jacket surface of the drying cylinder.
  • it is the predominant direction of most of the particles of the spray additive in conventional spray guns for laser or electron beam coating according to the invention, which have correspondingly known spatial distributions of the particles ejected from them.
  • the main component of motion of such an accelerated particle of spray additive material is that of the three spatial components of motion of the particle which has the largest amount.
  • substantially against gravity shall mean that the propagation direction of the jet and / or the main application direction of the spray additive material is / are chosen such that it is opposite to the direction of gravity, even with respect to only one component of motion.
  • the latter means that the smallest angle, eg that of the propagation direction of the jet and / or the main application direction and the direction of gravity, is between 0 ° and ⁇ 90 °, preferably between 0 ° and 45 °.
  • the term according to the invention means that the jet (in its extension in the direction of propagation) and / or the spray additive material always impinges on the lateral surface of the same underneath the axis of rotation of the drying cylinder.
  • the term functional layer in the context of the present invention means a layer which comes into direct contact with the fibrous web or indirectly, for example via a conveyor belt lying between the fibrous web and the functional layer, such as coverings or sieves revolving around them.
  • the functional layer thus has properties that particularly reduce corrosion and abrasion to the highest degree.
  • an adhesive layer is understood as meaning a layer which serves for the bonding between the roll core and a functional layer on the one hand.
  • both the adhesive layer and the functional layer are part of the coating applied to the drying cylinder, preferably a permanent coating in the solid state, which is applied successively to the roll core during manufacture becomes.
  • Functional and / or adhesive layer can be constructed from a plurality of individual layers.
  • substrate - depending on the stage of the coating produced - preferably the radially outermost, directly to be coated material, such as the roll core, the adhesive layer, the functional layer or where this makes sense, understood a combination thereof.
  • alloying region is understood as meaning a metallic bond between them obtained as a result of the melting (with subsequent cooling) of at least two at least partially metallic materials with the formation of a crystalline lattice.
  • the applied coating can form a metallic connection with the roll core of the drying cylinder.
  • the materials of the adhesive layer and the roll core may be selected so as to form such an alloy region when they are formed together in the production of the coating due to heat-fusion after solidification.
  • the materials of the adhesive layer and of the functional layer can be selected such that they do not form such an alloy region with one another.
  • beam source is meant a source which emits coherent light or particles, such as electrons, which can be focussed into a beam.
  • Radiation sources according to the invention are thus lasers and electron beam sources.
  • Lasers of various types such as CO2 laser, HDPL (High Power Diode Laser) or DDL (Direct Diode Laser) or combinations thereof are possible.
  • the term laser cladding or a method immediately following this is understood to mean a coating process by means of which it is possible to melt the surface to be coated, ie the substrate, itself (at least near the surface).
  • a high heat input is in the known thermal spraying process itself, such as the flame, High-speed flame, arc, or plasma spraying, which leads to the melting or melting of the substrate, not possible.
  • a melting or melting in Lasercladding can be done for example by supplying thermal energy to the substrate to be coated and can be preferably realized by radiation, such as laser radiation.
  • the material of the adhesive or functional layer is generally introduced into laser beam path in the beam path of the laser, melted and applied to the substrate.
  • the laser beam at least partially melts the surface of the substrate with respect to the radial thickness.
  • the advantage of this method is that the service life of the drying cylinder can be extended. Because of the laser cladding can be rebuilt with an appropriate choice of spray additive - eg the same material as that of the roll core (or a compatible material) - the wall thickness of a really exhausted drying cylinder. For example, if the material of the roll core of the drying cylinder at least partially a metal such as steel or cast iron, so the spray additive material may be selected accordingly and also be at least partially such a metal.
  • the spray additive and the substrate here the roll core of the drying cylinder, are melted together, mix and form after cooling a kind of weld bead (order) with each other.
  • a kind of weld bead order
  • the wall thickness of an old, used drying cylinder can be increased again, so that this again meets the safety requirements for pressure vessels.
  • it can be coated according to the invention accordingly.
  • laser cladding implies the use of a laser as a beam source, the use of a beam source emitting an electron beam is also conceivable.
  • Another advantage of coating a drying cylinder according to the method of the invention is that it is now possible to dispense with a highly explosive fuel in gaseous form, such as oxygen or hydrogen. Because both the melting of the substrate and the spray additive material is now carried out alternatively by means of laser beam. As a result, on the one hand the volume of the Coating method, in contrast to the previous known thermal spray methods with burners are significantly reduced. On the other hand, no relatively high demands on the extraction of the reaction gases and the remnants of the spray additive material are more necessary, because it can be used with relatively lower rates of application, so that less spray additive per unit time can be promoted. Thus, less spray additive, which is not melted, gets into the dryer, so that the cleaning effort after such a coating can be significantly reduced.
  • a highly explosive fuel in gaseous form such as oxygen or hydrogen.
  • a successive production of the coating takes place when the entire surface of the drying cylinder is coated gradually, for example in a continuous spiral line. This is particularly the case when the area over which the heat input occurs is significantly smaller than the total area of the drying cylinder to be coated. This is the case in the generic drying cylinders, when used for example in a paper machine, basically the case. Because here is the spray additive material volume flow seen in the width direction is less than the total width of the drying cylinder.
  • the functional layer can be applied to an adhesive layer lying below in the radial direction.
  • the adhesive layer can then form an alloy region with the roll core with the roll core with appropriate material pairing of roll core and adhesive layer.
  • the adhesion layer lying directly underneath in the radial direction can be at least partially melted, so that the functional layer and the adhesive layer again form an alloy region in the region of their transition.
  • the functional layer and / or the adhesion layer can be constructed from a plurality of individual layers.
  • the spray additive for the production of individual functional layers and / or adhesive layers may be selected from one another such that the layers differ. As a result, coatings tailored to the desired application can be achieved.
  • the spray additive for producing the functional layer may be at least partially a metal or a technical ceramic such as oxide ceramics.
  • the oxide ceramic contains metal oxides selected from chromium oxide (Cr 2 O 3), titanium oxide (TIO 2), aluminum oxide (Al 2 O 3), zirconium oxide (ZrO 2), silicon oxide (SIO 2), yttrium oxide (Y 2 O 3) or mixtures thereof. As a result, a particularly abrasion-resistant coating can be specified.
  • the spray additive for the production of the adhesive layer may be at least partially a metal and preferably a nickel-aluminum alloy, preferably with a mixing ratio of 95% nickel and 5% aluminum, each based on the weight of the mixture. This material or mixing ratio allows a particularly ductile-reactive coating, which is important for the stated application of the invention.
  • the coating system may be assigned its own drive in order to drive the drying cylinder to be coated at least during the coating and preferably also during the preferably machining surface processing at its installation position in the drying device. This has the advantage that a coating can be done independently and without the existing drive of the drying cylinder. This may be important if the coating of the drying cylinder is to be carried out while maintaining the drive of the drying device. This has the advantage that the drying cylinder does not have to be removed.
  • the coating installation may be assigned a device for surface treatment of the lateral surface of the drying cylinder, preferably for removing an existing coating of the drying cylinder or for processing the coating produced according to the invention.
  • the advantage of this is that even the mentioned processing of the coating can easily be done in-situ in the drying device, without the drying cylinder must be removed for this purpose from the drying device.
  • the invention relates to a coating system and a system of coating equipment and drying apparatus and a method for retooling or producing a drying apparatus according to the independent claims.
  • the conversion takes place in the non-operating state of the drying device. By means of the conversion, the system according to the invention of coating installation and drying device is produced.
  • the coating system may comprise means to be detachably connectable to the drying device to be coated. These means can be set up in such a way that the coating installation is supported or fastened in direct contact with the drying device, for example on a component of the drying device, or indirectly, for example over the floor on which the drying device is supported. These means may be, for example, traverses on which the coating system is slidably disposed along the longitudinal axis of the drying cylinder to be coated.
  • the present invention relates to a machine for producing and / or finishing a fibrous web such as a paper, board or tissue web comprising a coating system and a system of coating system and drying device.
  • 1 a and 1 b show a highly schematic representation of two drying devices suitable for the invention in side view, the drying cylinders of which can be coated;
  • Fig. 3 is a highly schematic plan view of a system
  • FIG. 4 shows an embodiment in a highly schematic, sectional view through a coating according to the invention.
  • Fig. 1 a and 1 b show two embodiments of the invention in a schematic side view of an operating state of the drying device.
  • a part of a drying device of a machine for producing and / or finishing a fibrous web F such as a paper, board or tissue web is shown in each case.
  • the fibrous web F is formed in the machine, drained and then passed to the drying device for drying and / or smoothing.
  • a of the drying cylinder 1 is designed as a Yankee cylinder.
  • the formed in the machine fibrous web F is transferred from a conveyor belt by means of a press roll 10 at a first pick-up point to the drying device here.
  • the first take-off point is formed here by a press nip, which form the press roll 10 and the drying cylinder 1 together.
  • the drying cylinder 1 is designed to be heated. Furthermore, it is associated with a drying hood 1 1 to the Fibrous web F in addition to dry. After the fibrous web F has left the drying hood 1 1, it is removed from the drying cylinder 1 at a second delivery point. This is done in this case by a creping doctor 12, which is pressed against the lateral surface of the drying cylinder.
  • the creping doctor 12 is arranged in the running direction of the fibrous web F through the drying device (or in the direction of rotation of the drying cylinder 1) behind the press roller 10.
  • the creped fibrous web F is wound up.
  • the fibrous web is therefore always in direct contact with the rotating drying cylinder or its lateral surface only within the looping region shown by dashed lines.
  • the wrapping area is thus limited in the direction of rotation of the drying cylinder from the first delivery point and the second delivery point.
  • FIG. 1 b the fibrous web F is guided over a plurality of drying cylinders 1 arranged one behind the other in the running direction of the fibrous web F.
  • the fibrous web F does not come into direct contact with the drying cylinders 1 but is carried by a fabric (not shown). In this case, the clothing lies directly on the respective drying cylinder 1.
  • the fibrous web F wraps around the respective drying cylinder 1 in each case in a looping area (shown in dashed lines).
  • FIG. 2a the operating state in FIG. 2a and the non-operating state of the drying device in FIG. 2b are shown.
  • the fibrous web F does not pass through the drying cylinder 1, as shown in FIG. 2 a. Rather, only the path traveled by the fibrous web F in the operating state of the drying device, indicated by dashed lines.
  • the drying device is placed in the non-operating state according to FIG. 2b and possibly converted for the first time correspondingly for the coating.
  • the drying device is provided with a coating system 13.
  • the latter is arranged at an installation position in the drying device, which lies outside of the existing in the operating state of the drying device wrap of the fibrous web F - ie near the Be Anlagenungsausgabe region - here below the drying cylinder 1 between the two first take-off positions, namely the creping doctor 12 and the press roll 10. If the coating installation 13 is installed at the named location in the drying device, then the system according to the invention is achieved from both.
  • the coating system 13 can thus be retrofitted in existing drying devices. It can remain there permanently or only temporarily for the duration of the coating or a surface treatment of the drying cylinder 1 carried out before or subsequent thereto.
  • the coating system 13 can be detachably connected to the drying device via means.
  • These means include, for example, the traverse 14, at which the coating system 13 is supported.
  • the Traverse 14 can indirectly, for example on the ground on which the drying device is supported on this.
  • the traverse 14 could also be fixed, so inseparably connected to the ground or the drying device, so be part of the drying device.
  • the coating installation 13 may further be assigned a device for surface treatment 6. This is likewise provided in the area of the above-mentioned installation position of the coating installation 13.
  • the former can be designed as a grinding machine and / or for blasting, such as shot peening of the drying cylinder 1.
  • the device 6 can be mounted on the drying device via appropriate means, such as the traverse 14 or via its own (not shown) Traverse.
  • the system of drying device and coating system 13 can be redissolved.
  • the coating system 13 is removed from the drying device again, so that again results in the arrangement shown in Fig. 2a.
  • Fig. 3 the coating system 13 is shown in a highly schematic plan view in detail.
  • the longitudinal axis of the drying cylinder 1 runs here in the plane of the drawing.
  • the drying cylinder 1 rotating about its longitudinal axis is suitably driven.
  • the coating installation 13 comprises a delivery device 7 which is mounted on the traverse 14 and which is displaceable relative to the drying cylinder 1 back and forth parallel to its longitudinal axis (see the double care product).
  • the latter comprises a selectively supply and disconnectable material supply 8 for supplying a spray additive material (indicated by dotted lines), a jet 9 which is emitted by a beam source, not shown, in which the spray additive is introduced and a protective gas supply, not shown, for supplying protective gas to the drying cylinder 1 .
  • the application device 7 can be understood as a spray burner.
  • the spray additive is present in the form of powder in the present case.
  • the application of inert gas is indicated in the present case by the cone of the jet 9.
  • the protective gas can serve to entrain and / or accelerate the material, such as spray additive material, which is introduced into the beam path of the beam source for melting.
  • the accelerated by inert gas, off, on or molten spray additive is on the drying cylinder 1 to be coated, here, for example, the naked (ie freed from an existing coating), by means of the device 6 machined roller core 2 (see Fig. 4) thrown. If the surface of the roll core 2 is also melted, the molten spray additive material enters the melt of the roll core 2.
  • the application device 7 can be designed such that the protective gas, jet 9 and spray additive together, e.g. concentric, emerge from one and the same spray burner. In that case, the jet could be coupled into the spray gun so that at least the longitudinal axis of the jet and the main direction of application of the spray filler coincide.
  • the spray additive material is ejected from the application device 7 in the main application direction.
  • Both the main application direction of the spray additive material and the discharge direction of the jet 9 run in the illustrated view counter to the direction of gravity, the latter here running along a vertical line through the longitudinal axis of the drying cylinder 1.
  • the spray additive material from below - below the longitudinal axis / axis of rotation of the drying cylinder 1, against the force of gravity applied to the drying cylinder 1.
  • jet 9 and spray additive from come in different directions, so that the propagation direction of the beam 9 is angled to the main application direction of the spray additive.
  • the spray additive material can be brought tangentially to the lateral surface of the drying cylinder 1, while the jet 9 still runs against gravity and thus at an angle to the main Ausbringungungsraum of the spray additive.
  • FIG. 4 shows, in a highly schematic sectional view, an embodiment of the present invention in a partial cross section perpendicular to the longitudinal axis through the drying cylinder 1 from FIGS. 1 a or 1 b.
  • the roll curvature has been disregarded.
  • the thickness seen in the radial direction of the individual layers of the roller 1 is not shown to scale. It is only the sequence of layers to be symbolized.
  • the drying cylinder 1 shown in each case usually has a radially inner roller core 2, which may be at least partially made of a metal such as steel.
  • the coating 5 according to the invention is applied directly on the roll core 2 in the radial direction on its circumference. It comprises a functional layer 4. This can be applied directly to the roll core 2 or, as shown in dashed lines, be arranged on at least one adhesive layer 3.
  • the adhesive layer 3 is used for adhesion between the roll core 2 and the radially outwardly next layer, here the functional layer 4.
  • the adhesive layer 3 is advantageously selected when the coating 5 should have improved adhesion between the functional layer 4 and roll core 2.
  • the roll core 2 and the adhesion layer 3 and / or the adhesion layer 3 and the functional layer 4 together form an alloy region. Seen in the radial direction of the drying cylinder 1, the functional layer 4 is applied to the at least one adhesion layer 3.
  • the whole, each according to the produced coating 5 can be prepared by means of coating system 6.

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Abstract

L'invention concerne un procédé de revêtement d'un cylindre de séchage d'un dispositif de séchage pour le séchage et/ou le lissage d'une bande de matière fibreuse, l'opération de revêtement étant réalisée à l'intérieur du dispositif de séchage.
PCT/EP2017/068729 2016-07-29 2017-07-25 Procédé de revêtement d'un cylindre de séchage Ceased WO2018019814A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201780045131.3A CN109477303A (zh) 2016-07-29 2017-07-25 涂覆烘缸的方法
EP17743036.0A EP3491188B1 (fr) 2016-07-29 2017-07-25 Procédé de revêtement d'un cylindre de séchage
US16/320,614 US20190186076A1 (en) 2016-07-29 2017-07-25 Method For Coating A Drying Cylinder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016114014.7A DE102016114014B4 (de) 2016-07-29 2016-07-29 Verfahren zur Beschichtung eines Trockenzylinders
DE102016114014.7 2016-07-29

Publications (1)

Publication Number Publication Date
WO2018019814A1 true WO2018019814A1 (fr) 2018-02-01

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PCT/EP2017/068729 Ceased WO2018019814A1 (fr) 2016-07-29 2017-07-25 Procédé de revêtement d'un cylindre de séchage

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WO2016071299A1 (fr) * 2014-11-06 2016-05-12 Voith Patent Gmbh Rouleau et procédé de fabrication dudit rouleau

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DE59400868D1 (de) 1993-02-10 1996-11-28 Klaus Kalwar Vorrichtung zur Wiederherstellung einer beschädigten Beschichtung einer Walze
EP2573260B1 (fr) 2011-09-20 2015-05-13 Dirk Richter Rouleau et procédé de revêtement de rouleau
US9863091B2 (en) * 2013-05-06 2018-01-09 Voith Patent Gmbh Roll
CN104439881B (zh) * 2014-11-19 2017-02-08 首钢总公司 粗轧机架辊定位槽激光熔覆加在线机加工的修复方法
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WO2016071299A1 (fr) * 2014-11-06 2016-05-12 Voith Patent Gmbh Rouleau et procédé de fabrication dudit rouleau

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DE102016114014A1 (de) 2018-02-01
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US20190186076A1 (en) 2019-06-20
EP3491188B1 (fr) 2020-11-25
CN109477303A (zh) 2019-03-15

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