EP2191068A1 - Dispositif et procédé permettant de dégazer un milieu fluide ou pâteux - Google Patents

Dispositif et procédé permettant de dégazer un milieu fluide ou pâteux

Info

Publication number
EP2191068A1
EP2191068A1 EP08803191A EP08803191A EP2191068A1 EP 2191068 A1 EP2191068 A1 EP 2191068A1 EP 08803191 A EP08803191 A EP 08803191A EP 08803191 A EP08803191 A EP 08803191A EP 2191068 A1 EP2191068 A1 EP 2191068A1
Authority
EP
European Patent Office
Prior art keywords
medium
vacuum chamber
distribution
distribution plate
degassing
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.)
Withdrawn
Application number
EP08803191A
Other languages
German (de)
English (en)
Inventor
Bernd-Uwe Stellner
Manfred Ueberschär
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2191068A1 publication Critical patent/EP2191068A1/fr
Withdrawn legal-status Critical Current

Links

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
    • D21H19/00—Coated paper; Coating material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0021—Degasification of liquids by bringing the liquid in a thin layer
    • B01D19/0026—Degasification of liquids by bringing the liquid in a thin layer in rotating vessels or in vessels containing movable parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0036—Flash degasification
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0042—Degasification of liquids modifying the liquid flow
    • B01D19/0047—Atomizing, spraying, trickling
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • 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
    • D21H23/48—Curtain coaters

Definitions

  • the present invention relates to an apparatus and a method for degassing a liquid or pasty medium, in particular a coating color for coating a substrate, in particular a paper web, a board web or the like.
  • Such devices as well as in this proceeding process are known for example in the field of papermaking and processing and serve to remove air bubbles, which can form in a coating color during a treatment process of the coating color. In this way, it is avoided that the gas bubbles burst after painting the coating on the substrate and leave an uneven coat at the sites concerned.
  • Such a known device for degassing a coating color for coating a moving paper web comprises a vacuum chamber in which a negative pressure can be generated, an inlet arrangement which introduces the coating color into the vacuum chamber, an outlet arrangement which discharges the coating color from the vacuum chamber and a distribution element, e.g. , B. a distribution plate, which is disposed within the vacuum chamber and distributes the coating color in the interior of the vacuum chamber to increase the effectiveness of the degassing.
  • a running in this device method introduces the coating color in the vacuum chamber, sets the coating color for a certain time the negative pressure in the vacuum chamber, so that gas bubbles are dissolved in the coating color, and leads the coating color after degassing again from the vacuum chamber.
  • the so degassed coating color is then an applicator, z. B. a curtain coating plant, fed, which applies the coating color on a moving paper web.
  • an applicator z. B. a curtain coating plant, fed, which applies the coating color on a moving paper web.
  • Construction which in addition to relatively high production costs for the devices makes a sometimes considerable maintenance required. It is mainly on blades, baffles or other for the distribution of the medium in the interior of the vacuum chamber optionally rotating elements arranged for deposition of medium, resulting in a special cleaning of the device.
  • the object of the present invention is to provide an apparatus and a method for degassing a liquid or pasty medium, with which a more effective degassing, especially of difficult to degasified media and media with very small gas inclusions, with a compact and with little effort too waiting device can be achieved.
  • a device of the type mentioned which comprises: a vacuum chamber in which a negative pressure is generated, an inlet arrangement which introduces the medium into the vacuum chamber, an outlet arrangement which the medium discharging from the vacuum chamber, at least one distribution plate disposed within the vacuum chamber, the inlet assembly discharging the medium in the form of a plurality of jets or in the form of at least one curtain onto portions of the surface of the distribution plate over one center of the at least one Distributor circulating line or area are distributed.
  • the device thus has a distribution plate, on the
  • the medium emits substantially uniformly distributed.
  • the medium impinge on the surface of the distribution disc at one point from the inlet assembly, but it is simultaneously applied to the distribution disc at a plurality of locations, such that the portions of the surface of the distribution disc
  • Distribution disc on which the medium impinges, are distributed over a line or surface circulating around a center of the at least one distribution disc and are preferably connected to one another to form a substantially closed, circumferential line or surface.
  • a device for degassing a liquid or pasty medium, in particular a coating color for coating a substrate, in particular a paper web, a cardboard web or the like, comprising: a vacuum chamber in which a Vacuum is generated, an inlet assembly which introduces the medium in the vacuum chamber, an outlet arrangement which discharges the medium from the vacuum chamber, at least one distribution plate which is disposed within the vacuum chamber, wherein the inlet arrangement the medium in the form of a plurality of rays on the Discard surface of the distribution plate, which are distributed around a center of at least one distribution plate.
  • Another possibility, encompassed by the above first definition of the invention, is to arrange one or more beams in the manner of one at least partially around the
  • Center of distributed nozzles or in addition to such nozzles distributed around the center can be achieved.
  • the inventive way of applying the medium to the distribution plate a uniform distribution of the medium is already achieved during insertion through the inlet assembly, so that the effect of the distribution plate can be significantly improved. Due to the effective distribution of the medium, the surface-volume ratio of the medium is significantly increased, so that the transport of the gas inclusions to the surface of the medium and thus the extraction of the trapped gas is supported from the medium. As a result, a more effective degassing of the medium is achieved.
  • a residence time of the medium within the vacuum chamber can be reduced without significant losses in the degassing effect.
  • the vacuum chamber can be made more compact or / and the throughput of medium can be increased and at the same time a sufficient or even improved degassing of the medium is ensured.
  • a more effective degassing by the inventive device has a positive effect on the installation space, the residence time of medium in the device, the flow rate of medium, the reduction of the gas content and the cycle time of the degassing process.
  • At least one discharge port of the inlet assembly is held at a fixed position above the at least one distribution plate for discharging at least one of the jets and the curtain so that it is possible to secure the inlet assembly including the at least one discharge port to a wall of the vacuum chamber. resulting in a simple and stable construction of the device.
  • the inlet arrangement has a plurality of around the center of the at least one
  • Distribution plate distributed dispensing openings, which simultaneously the medium on the
  • Each of the discharge openings can thus one
  • Dispensing openings around the center can be realized.
  • the discharge openings of the described embodiment preferably have a jet-expanding outlet geometry for dispensing a fan or / and funnel-shaped jet of the medium.
  • a jet-expanding outlet geometry for dispensing a fan or / and funnel-shaped jet of the medium.
  • each of the discharge openings delivers the medium to a substantially equal section of the line or surface circulating the center of the at least one distribution plate.
  • the discharge openings can be inexpensively of the same type and arranged in a sufficient number distributed around the center.
  • the sections to which the medium is applied by the respective associated discharge openings set up so that adjacent sections overlap each other something, so that a complete application of medium along the circumferential around the center of the distribution plate line or surface is ensured.
  • the aim in all embodiments is that with medium wetted portion of the circumferential line or area is greater than the non-wetted portion.
  • the surface of the at least one distribution plate, on which the medium discharged from the inlet arrangement impinges is substantially planar and horizontally aligned.
  • the planar and horizontal design of the surface supports effective spreading of the medium on the surface.
  • an angle of approximately 90 ° arises between the medium discharge direction or the beam center axis and the surface of the distribution plate, which ensures a maximum impact effect of the medium upon impact and further supports a substantially uniform and all-round propagation of the medium.
  • the inventive distribution of the medium on the surface of the valve disk it is also possible to make the surface of the valve disk substantially planar, d. H. to dispense with any additional baffles, vanes or other elements known in the art for distributing the medium.
  • a relatively simple and inexpensive construction of the distribution disc is made possible, which has no excessive accumulation of medium-supporting sections and is easy to clean.
  • the installation and removal of complicated distribution elements can be omitted. This results in a simple maintenance of the device according to the invention.
  • the at least one distribution plate is at least partially essentially formed only by a planar disc or at least partially substantially only by a planar disc and the edge of the distribution disc rotating vertical wall portion.
  • the distribution plate is then of very simple geometry and construction, so that it is not only inexpensive to produce, but also offers very little possibility of attachment for pollution and is easy to clean.
  • the vertical wall section may be discussed in more detail later descriptive way of being a rotating sieve. It is understood that the distribution plate can be arranged with a deviating from the planar shape holding portion on a drive shaft. Otherwise, the distribution plate is preferably formed essentially only by the planar disk or only by the planar disk and the edge, possibly the wire.
  • the distribution disc is rotatably mounted about a substantially vertical axis and is driven by a drive unit. By occurring during rotation of the distribution disc centrifugal forces a uniform distribution of the medium is achieved radially outward.
  • a plurality of distribution plates can be arranged one above the other in each case in sections of each other in the vacuum chamber.
  • the medium discharged from a higher distribution plate then passes under the influence of gravity, if necessary by guiding on suitable guide surfaces, onto the surface of a deeper distribution plate on which the medium is then redistributed.
  • several or all distribution disks arranged one above the other can be driven in rotation. It is also conceivable that during the venting operation, the uppermost distribution plate is fixed and the remaining distribution plates are driven in rotation.
  • a sieve can be provided, which rotates about a substantially vertical axis and by a drive unit, in particular the drive unit driving the distributor, is driven.
  • a rotating screen may be located directly beneath the topmost distribution plate so that it extends beyond the edge of the topmost distribution plate absorbs expired medium, accelerated and hurls through its pores against the inner wall of the vacuum chamber.
  • a sieve may also be formed as a vertical wall which revolves around at least one rotating distributor along its outer edge. Medium, which propagates and distributes radially outward by the rotation of the distribution disc, then strikes the screen wall and is thrown outwardly against the inner wall of the vacuum chamber by the centrifugal force of the rotating distribution disc through the pores of the screen.
  • the discharge openings are formed by exchangeable nozzles.
  • the nozzles may be formed with a dispensing opening adapted to a specific medium, so that the device can be adapted in a simple manner to a specific medium to be degassed by replacing the nozzles.
  • the nozzles may have the jet broadening outlet geometry and e.g. be formed by flat jet nozzles, Tongue nozzles, vane nozzles, G confusekannenkopfdüsen or atomizing nozzles.
  • the device can not only be adapted to a particular medium to be degassed in this way, but also the shape of the jet to be delivered through a relevant discharge opening can be selected as desired.
  • the inlet arrangement can be made of a total of several parts to facilitate assembly, disassembly and cleaning.
  • the distribution of the medium according to the invention on the surface of the distribution plate can alternatively or additionally also be achieved in that the delivery openings comprise a multiplicity of openings of small diameter arranged close to one another. In this way, an arrangement in the manner of a G stealkannenkopfs or a shower head is realized.
  • Such tempering may include heating means or coolant or the combination of heating means and cooling means to the Set temperature at individual sections of the device and / or the temperature of the device as a whole to a value advantageous for the degassing operation or to keep within a favorable temperature range.
  • the tempering device heats a collecting section of the device in which collects from the at least one distribution disc discharged medium.
  • the medium is heated before the outflow, so that in this part of the vacuum chamber, the saturation vapor pressure of the medium is achieved faster or more reliable, whereby the venting is favored.
  • the remaining part of the device in particular the upper part of the device, is colder relative to the heated collecting section, as a result of which deposits of the medium on the walls of the vacuum chamber and on distribution elements in the interior of the vacuum chamber are counteracted.
  • the device can advantageously be designed such that it can be operated with a pressure inside the vacuum chamber equal to or less than a saturation vapor pressure of the medium.
  • the tempering arrangement may alternatively or additionally also cool a section of the inlet arrangement or a section of the apparatus arranged in the direction of flow of the medium upstream of the inlet arrangement.
  • the associated saturation vapor pressure By reducing the temperature of the medium, the associated saturation vapor pressure also decreases, so that the device can be operated at a lower pressure. At lower pressure less gas is dissolved in the medium, so that the effectiveness of degassing is greater.
  • the cooling of the medium in the region of the inlet is particularly useful when the medium For example, due to a previous manufacturing or treatment process has elevated temperature.
  • the tempering arrangement of the device according to the invention can be set up in such a way that it temperates sections or components of the device which come into contact with the medium to be degassed. Cooling of these sections or components is advantageous because in this way deposits of medium in these areas are reduced and thus the maintenance of the device is facilitated.
  • the tempering arrangement can cool at least a portion of a wall surrounding the vacuum chamber or control the temperature of medium-conducting elements or interacting elements in the interior of the vacuum chamber / regulate.
  • These include, for example, return plates or return funnels, which are mounted on the walls of the vacuum chamber to lead medium from a higher-lying distribution element to a lower-lying distribution element.
  • the effectiveness of the tempering arrangement can be increased if the vacuum chamber is surrounded by a double wall. A deviating from the ambient temperature of the vacuum chamber can be adjusted or maintained in this way with less energy.
  • a device according to the invention of the type described above is advantageously set up such that it can degas a liquid or pasty medium comprising at least one binder and at least one pigment and preferably a solids content between 50 and 80 wt .-% or / and a viscosity between 700 and 4000 mPa. It has been shown that for such Media with the device according to the invention a particularly effective degassing is achieved.
  • an application device which comprises at least one applicator for applying a liquid or pasty medium, in particular one
  • Coating paint for coating a substrate, in particular a paper web, a
  • Cardboard web or the like, as well as a device of the type described above according to the invention comprises, wherein the applicator is connected directly or indirectly to the outlet arrangement or connectable.
  • the commissioned work can be loaded in this way with the degassed medium and allows the
  • the applicator which can be designed as a curtain applicator, a slot nozzle, which emits the medium directly or indirectly to the substrate.
  • a thorough degassing of the application medium for the quality of the job is particularly important.
  • the above-mentioned object is achieved by a method for degassing a liquid or pasty medium, in particular a coating color for coating a substrate, in particular a paper web, a board web or the like, comprising the steps: admitting the medium, so that it is dispensed substantially simultaneously over a line or surface circulating a center of the at least one distribution plate onto the surface of the distribution plate, distributing the medium inside the vacuum chamber and discharging the medium from the vacuum chamber.
  • the method preferably further comprises the step: purging the vacuum chamber with a flushing medium.
  • the specified steps for degassing or venting of the medium are carried out simultaneously, since the medium is usually fed continuously, degassed and removed.
  • Such a degassing operation can, in principle, be maintained for any length of time. Depending on the production requirements, operating times of a few hours to a few days are common.
  • the distribution of the medium it should be noted that it is not important that the distribution is uniform. It is particularly important that the medium receives a large surface, so that the venting effect is improved. If the deaerator or deaerator is not in the degassing or venting operation, then it can then be cleaned for a new venting or degassing operation to be carried out later by flushing the vacuum chamber.
  • the method can proceed automatically or semi-automatically so that the device successively first operates in a medium circuit in which the medium to be degassed is passed through the device, and then switched to a purge cycle in which the passage of medium is interrupted and instead rinse is passed through the device.
  • the rinsing process is finally stopped manually or automatically after a predefinable time.
  • the present invention according to a further aspect provides an application method using a device or applicator device described above, with which a liquid or pasty medium, in particular a coating color, as a coating on a substrate, in particular a paper web, a board web or the like, applied can be.
  • Fig. 1 shows a schematic representation of a ventilation device according to a first embodiment of the present invention.
  • Fig. 2a and 2b show schematically in perspective view and in
  • FIG. 1 Top view of an inlet arrangement of the device shown in Fig. 1.
  • Fig. 3a shows a schematic sectional view of a
  • FIG. 3b schematically shows the inlet arrangement of the device shown in FIG. 3a in a view along the line III-III in FIG. 3a.
  • Figs. 4 to 6 show schematic sectional views of a
  • Fig. 1 is an apparatus for degassing a coating color for coating a
  • Paper web generally designated 10.
  • the device 10 comprises a
  • Vacuum chamber 12 which is connected via a vacuum port 14 to a vacuum source, not shown in the figure, to suck air from the interior of the vacuum chamber 12.
  • the vacuum chamber 12 is surrounded by a hermetically sealed wall 16, and has in the shown
  • a sight glass which is arranged in the wall 16 of the vacuum chamber 12 at a suitable location and sealed hermetically against the wall 16, and other control elements for the operation of the vacuum chamber, in particular a connection for a pressure measurement or a connection for a vacuum breaker, which allows a controlled and rapid cancellation of the negative pressure in the vacuum chamber 12.
  • a generally designated 22 inlet assembly is connected via a port 24 to a device, not shown in Fig. 1 for providing the gas to be degassed
  • the wall 16 is penetrated by a channel 26, which in a radial
  • the dispensing head 30 which will be described in more detail below, comprises a plurality of nozzles 32, which in each case form the medium in the form of jets 34 in the
  • the introduced into the vacuum chamber 12 medium then passes through a distribution assembly 36 and finally accumulates under the influence of gravity in a collecting area 38 at the bottom of the vacuum chamber 12 to be subsequently discharged through an outlet assembly 40 from the vacuum chamber.
  • the outlet assembly 40 is connected to a commissioned work, z. B. a curtain commissioned work, Curtain coater with slot or slide nozzle with 1: 1 direct application, connected to apply the degassed medium to a substrate.
  • the distribution assembly 36 includes a first distribution plate 42, a second distribution plate 44, and a third distribution plate 46, all of substantially similar construction, oriented horizontally and stacked in the vertical direction.
  • the distribution plates each have a flat, circular, planar disk whose center Z lies substantially on the cylinder axis of the cylindrical wall 16 of the vacuum chamber 12.
  • the distribution plates 42, 44, 46 are respectively fixed in its center to a rotary shaft 48 which is rotatably supported in a floating manner in an upper portion of the negative pressure chamber 12 and is rotationally driven by a drive means 50.
  • a rotary shaft 48 which is rotatably supported in a floating manner in an upper portion of the negative pressure chamber 12 and is rotationally driven by a drive means 50.
  • the edge of each distribution plate 42, 44, 46 rotates around a strip-shaped sieve 52, which is attached to the edge of the respective distribution plate 42, 44, 46, so that it rotates with the respective distribution plate 42, 44, 46.
  • return funnels 54, 56 are fixed to the inside of the wall 16, which are of such shape and size that medium extending from the edge of the associated distribution plates 42, 44 in a radially outward direction. is discharged in a direction vertically downwards or in an intermediate direction (with both radially outwardly and vertically downwardly extending directional components) to which return hoppers 54, 56 impinge and through which radially inwardly via an underlying distribution plate 44, 46 to be led.
  • the inlet arrangement 22 will be explained in more detail below with reference to FIGS. 2a and 2b.
  • the channel 26 in the interior of the inlet arrangement 22 branches into two channels inside two parallel arms 58, 60, which run parallel to this at a distance above the topmost distribution plate 42.
  • Each of the arms 58, 60 has on its underside two nozzles 32, at which the medium exits from the dispensing head 30 into the vacuum chamber 12 and impinges on the surface of the distribution plate 42 as a jet 34.
  • the beam shape of the medium beams emitted by the nozzles 32 can be clearly seen in the plan view of FIG. 2b. It should be noted that although in FIGS.
  • each of the nozzles 32 emanate a plurality of continuous or dashed lines, these lines merely serve to illustrate the beam shape and represent non-linear individual beams. Instead, the nozzles 32 fan the medium more or less evenly over the area shown by the outermost beamlines in the figures.
  • the nozzles 32 fan the medium jet to such an extent that at least one annular surface F at the edge 62 of the distribution plate 42 is completely wetted with the medium.
  • the medium is discharged through the nozzles 32 in the form of a plurality of jets 34 on portions of the surface of the distribution plate 42, which are distributed over an annular area around the center Z annular surface F.
  • the exit geometry of the nozzles 32 may be shaped accordingly or the orientation of the nozzles 32 adjusted accordingly.
  • flat jet nozzles, tongue nozzles or vane nozzles can be used, which produce a flat jet, a conical jet or an otherwise expanded jet of medium.
  • a different number of nozzles, in particular three, five or six nozzles, can also be distributed on a circular path around the center Z.
  • the angular range wetted by each nozzle on the distribution plate 42 is then adjusted by appropriately selecting the nozzle fan angle and nozzle pitch from the distribution plate 42 to ensure circumferential full wetting at least in an annular zone on the distribution plate 42.
  • the fan-out angle is also somewhat larger, so that slight overlapping regions 64 are formed, against which application medium from two adjacent nozzles 32 strikes.
  • the device according to the invention according to FIGS. 1 and 2a, 2b operates as follows. Medium introduced through the inlet assembly 22 is distributed through the nozzles 32 on the uppermost rotating distribution plate 42 and moves radially outwardly by the centrifugal force. The medium impinging on the sieve 52 passes therethrough and is thrown radially outwards in the direction of the wall 16 of the vacuum chamber 12.
  • the medium impinges on the return funnel 54, which returns it again in the direction of the rotary shaft 48 and discharges above the second distribution disc 44 located therebelow.
  • the medium thus impinging on the second distribution plate 44 is transferred in an analogous manner via the sieve of the second distribution plate 44 and the second return funnel 56 to the underlying third distribution plate 46, from which it is thrown against the wall 16 of the vacuum chamber 12. From there, the medium flows as a film along the conical bottom wall 20 to the collecting section 38 to be discharged via the outlet assembly 40 from the vacuum chamber 12.
  • Figs. 3a and 3b show a second embodiment of the present invention.
  • the dispensing head 30 ' is formed by two substantially semicircularly curved arms 58', 60 'which are arranged parallel to the distribution plate 42 so as to substantially complement each other to a full circle.
  • the formed as a hollow tubes arms 58 ', 60' have on their underside a plurality of outlet openings 32 ', so that a circular arrangement of outlet openings 32' results around the center Z of the distribution plate 42 around.
  • thin, substantially vertically extending jets 34 'of application medium pass perpendicular to the surface of the distribution plate 42 from the discharge openings 32'.
  • a temperature control 66 can be seen, which is arranged at an upper portion of the vacuum chamber 12 to cool a bearing portion of the rotary shaft 48, the rotary shaft 48 and other adjacent parts of the device.
  • the tempering arrangement 66 comprises a rotary shaft 48 surrounding channel 68, in which a cooling fluid circulates.
  • Other local cooling arrangements known to those skilled in the art may alternatively be used.
  • the exemplary embodiment shown in FIG. 3 a further differs from the first exemplary embodiment in that only one distribution plate 42 is arranged in the vacuum chamber 12, so that medium discharged from this distribution plate runs directly from the inner wall of the vacuum chamber 12 into the collecting section 38.
  • Fig. 4 shows a third embodiment of the present invention, in which the outer wall of the vacuum chamber 12 is formed by a double wall with an outer wall 16a and an inner wall 16b. Between the outer wall 16a and the inner wall 16b, an insulating medium may be interposed or a negative pressure maintained to reduce heat transfer between the walls 16a, 16b.
  • the arrangement of the third embodiment enables good thermal insulation of the inner wall 16b or the components arranged inside the vacuum chamber 12 and thus assists the effectiveness of a tempering arrangement which adjusts the temperature of one of these components or the inner wall 16b.
  • Fig. 5 shows a fourth embodiment of the invention comprising a heater 70 for heating the collecting portion 38 of the device.
  • the heater 70 is mounted in good thermal contact with the outside of the conical bottom wall 20 of the vacuum chamber 12 to deliver the generated heat via the bottom wall 20 to the collecting medium in the collecting section 38.
  • the heating device 70 may be a resistance heating element known to the person skilled in the art or a channel through which a heated fluid flows.
  • Fig. 6 shows a fifth embodiment of the present invention, in which, comparable to the first embodiment shown in FIG. 1, in the interior of the vacuum chamber 12, a plurality of distribution plates 42, 44, 46 are rotatably arranged.
  • the apparatus shown in Figure 6 includes a tempering assembly 66 "which cools a portion of the inlet assembly 22 as well as medium carrying portions of the wall 16 of the vacuum chamber 12.
  • a first cooling channel 68a passes around a portion of the inlet channel 26" outside Vacuum chamber 12 is located, second cooling channels 68b annularly surround an outer side of the wall 16 of the vacuum chamber 12 at the level of the upper distribution plate 42, 44, and a third cooling channel 68c annularly circumscribes the outer side of the wall 16 of the vacuum chamber 12 at a level of the lowest distribution plate 46th
  • the cooling channels 68a, 68b, 68c are traversed by a cooling medium and are either part of a common cooling medium circuit, so that they can be operated by a single cooling unit (not shown), or belong to individual cooling medium circuits, so that the temperature of individual sections of the device separately can be adjusted.
  • the cooling channels 68a, 68b, 68c are arranged in the manner described above so that they cool medium-carrying portions of the device, so that an accumulation of medium is counteracted and thus the maintenance of the device is facilitated.
  • the second cooling channels 68b in particular cool the return funnels 54, 56, against which the medium thrown off the rotated distribution plates 42, 44 bounces.
  • the Return funnel 54 formed of a thermally conductive material.
  • the return funnels 54, 56 are preferably made in two parts in order to simplify installation and maintenance thereof.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Paper (AREA)
  • Coating Apparatus (AREA)

Abstract

La présente invention concerne un dispositif permettant de dégazer un milieu fluide ou pâteux, notamment une peinture à appliquer sur un substrat, en particulier une bande de papier, une bande de carton ou similaire. Le dispositif comprend une chambre à vide dans lequel le vide peut être établi, un dispositif d'introduction qui introduit le milieu dans la chambre à vide, un dispositif d'évacuation qui évacue le milieu de la chambre à vide, ainsi qu'au moins un plateau de distribution qui se trouve à l'intérieur de la chambre à vide. Le dispositif d'introduction délivre le milieu sur la surface du plateau de distribution, autour d'un point central.
EP08803191A 2007-09-07 2008-08-25 Dispositif et procédé permettant de dégazer un milieu fluide ou pâteux Withdrawn EP2191068A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710000705 DE102007000705A1 (de) 2007-09-07 2007-09-07 Vorrichtung und Verfahren zum Entgasen eines flüssigen oder pastösen Mediums
PCT/EP2008/061073 WO2009033938A1 (fr) 2007-09-07 2008-08-25 Dispositif et procédé permettant de dégazer un milieu fluide ou pâteux

Publications (1)

Publication Number Publication Date
EP2191068A1 true EP2191068A1 (fr) 2010-06-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08803191A Withdrawn EP2191068A1 (fr) 2007-09-07 2008-08-25 Dispositif et procédé permettant de dégazer un milieu fluide ou pâteux

Country Status (5)

Country Link
EP (1) EP2191068A1 (fr)
JP (1) JP3163490U (fr)
CN (1) CN201873903U (fr)
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CN201873903U (zh) 2011-06-22

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