EP4076769A1 - Buse à fente large et procédé de fonctionnement d'une buse à fente large - Google Patents

Buse à fente large et procédé de fonctionnement d'une buse à fente large

Info

Publication number
EP4076769A1
EP4076769A1 EP20820090.7A EP20820090A EP4076769A1 EP 4076769 A1 EP4076769 A1 EP 4076769A1 EP 20820090 A EP20820090 A EP 20820090A EP 4076769 A1 EP4076769 A1 EP 4076769A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
particles
vibration device
fluid
slot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20820090.7A
Other languages
German (de)
English (en)
Inventor
Gerald BETZ
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.)
Fmp Technology GmbH
Original Assignee
Fmp Technology 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 Fmp Technology GmbH filed Critical Fmp Technology GmbH
Publication of EP4076769A1 publication Critical patent/EP4076769A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/40—Metallic substrate based on other transition elements
    • B05D2202/45—Metallic substrate based on other transition elements based on Cu
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to a slot nozzle for applying a fluid provided with particles and a method for operating such a slot nozzle.
  • the substrates are provided with a wide variety of materials, such as adhesives, lacquers or functional media, in wet film thicknesses between 1 ⁇ m and up to 5 mm.
  • Spraying, squeegee and dipping processes can be used to apply the media.
  • Another method is the so-called slot nozzle coating.
  • the medium to be coated is fed to a so-called slot nozzle with the aid of a pump or a pressure vessel.
  • the slot nozzle is designed in such a way that the medium to be applied is distributed over the width of the nozzle.
  • the fluid then exits through a high-precision nozzle gap (so-called slot) and is applied to the substrate to be coated.
  • slot nozzle Since the width of the nozzle gap can be up to 5 m, such a slot nozzle is also referred to as a slot nozzle.
  • the slot nozzle process represents a so-called full-surface coating process. The thickness of the coating fluid is applied ensured by the design of the nozzle interior and the continuity of mass. This process is used in a wide variety of industrial areas, such as in the paper and packaging industry, in the production of batteries and fuel cells and for the production of optically active and electronic components.
  • the media used for coating can, depending on the application, be provided with particles (solids).
  • particles solids
  • One problem when processing such media is that, due to their size, the particles usually tend to significant agglomeration and, in some cases, also to sedimentation. If this is the case, sedimentation zones and agglomerates can form in the slot die. If agglomerates get into the nozzle gap as a result of the flow or if adhesions form directly in the area of the gap, coating errors occur. This results in uneven transverse and longitudinal distribution of the medium on the substrate to be coated. If there is inadequate uniform distribution or even a blockage of the nozzle gap, the coating process has previously had to be interrupted and the nozzle cleaned. This leads to long service lives and also to fluctuations in the quality of the products.
  • DE 102009017453 A1 discloses a slotted nozzle for spraying a liquid that can be adapted to different properties of the liquids to be sprayed.
  • the slot nozzle enables liquids of different viscosities and with different solids content to be processed.
  • the slit nozzle proposed there has two spray air gaps arranged on both sides of a central liquid gap, via which spray air can be emitted for atomizing the liquid, a structure being arranged in the liquid gap which is designed as a comb-like intermediate layer. This is placed between the two walls bordering the liquid gap, teeth of the intermediate layer extending in the direction of an opening of the liquid gap. This allows the gap width to be varied, so that different chamber-like intermediate layers are placed between the two walls that delimit the liquid gap.
  • the comb-like intermediate layer is coupled with a balance, with balance amplitudes of 1/100 mm as the maximum proposed.
  • CA 869959 proposes a coating device that uses ultrasound to set a nozzle to be applied with the coating material vibrating.
  • the nozzle gap should be kept free of dirt and agglomerating coating material.
  • the use of vibrations in the ultrasound area is preferred, since low frequencies and large mechanical deflections can disadvantageously lead to a container containing the coating material starting to move, which can be noticeable in a reduced quality of the coating.
  • the nozzle gap is no more than 0.5 inch, i.e. approximately 13 mm, wide.
  • the object of the invention is to provide a slot nozzle for applying a fluid provided with particles and a method for operating a slot nozzle which are structurally and / or functionally improved so that the agglomeration and sedimentation behavior of particles in the nozzle during coating can be avoided or reduced.
  • a slot nozzle for applying a fluid provided with particles contains one or more different liquids, for example solvents, and one or more different solid materials.
  • the solid material (s) are as particles of the same and / or different size and with regular and / or irregular regular surface contained in the liquid or liquids. The selection of liquids, materials, particle sizes and compositions depend on the application.
  • the slot nozzle comprises a nozzle body, the nozzle body including an inner nozzle chamber for receiving the fluid provided with particles (coating fluid).
  • the nozzle body can in particular be formed from two nozzle halves, the inner nozzle chamber being formed between the nozzle halves.
  • the nozzle body can also comprise other components.
  • metal foils of a specified thickness are arranged between the nozzle halves.
  • the inner nozzle chamber can have any shape, viewed in a cross section, wherein the inner nozzle chamber can comprise a plurality of chambers.
  • the inner nozzle chamber can have an essentially round or teardrop-shaped cross section. Combinations thereof in sections can also be provided. In cross-section, the design of the inner nozzle chamber can change or be the same.
  • the fluid provided with the particles can be dispensed via a nozzle gap delimited by two walls onto a flat substrate that is moving in a transport direction relative to the slot nozzle.
  • the nozzle gap is formed in particular between the nozzle halves.
  • the gap width results from the thickness of the metal foil, which is therefore also referred to as the nozzle foil.
  • the design of the nozzle gap can change or be the same.
  • the length of the nozzle gap is preferably constant.
  • the relative movement between the slot nozzle and the substrate includes a movement of the substrate relative to the slot nozzle.
  • the substrate can, for example, be coated in a known roll-to-roll process, so that a movement of the substrate in the port direction is given, while the slot nozzle can be arranged statically.
  • the slot nozzle can be moved relative to the substrate.
  • the substrate can be in the form of a sheet, for example, in which case the nozzle body and the slot nozzle are moved relative to the substrate in the transport direction.
  • the substrate to be coated can consist of any material or any combination of materials.
  • the flat substrate can be in the form of a film made of plastic, aluminum, textile or paper.
  • the nozzle gap is designed individually with regard to its shape for a particular application.
  • the formation of the nozzle gap can depend, for example, on the type and / or composition of the coating fluid. Further influencing parameters can be the speed at which the coating fluid is applied to the substrate and a pressure loss to be achieved across the nozzle gap.
  • the size and / or shape of a nozzle inner and outer lip of the nozzle gap and the geometric transition from the nozzle gap to the nozzle inner chamber can be designed individually.
  • the slot nozzle further comprises a vibration device which is mechanically coupled to the nozzle body in order to set the nozzle gap and the fluid (coating fluid) provided with the particles in the nozzle inner chamber in vibration.
  • the vibration device can be operated with compressed air, hydraulically or electrically. According to the invention, the vibration device is designed to excite the nozzle body with an upper limit frequency of at most 1 kHz.
  • the vibration unit which generates mechanical vibrations through inertia, sets the stationary nozzle body with its slot nozzle and the coating fluid located in the nozzle inner chamber in vibration. It was surprisingly found that an agglomeration tendency and sediment The tendency of the particles contained in the fluid to vibrate can be reliably prevented if the vibration device is excited with a frequency well below Ultrafast, in particular with an upper limit frequency of at most 1 kHz.
  • the vibration device In order to suppress the agglomeration and / or tendency to sediment, sufficiently high kinetic energy is entered into the slot nozzle and thus the coating fluid contained therein by the vibration device, which works with comparatively low frequencies. This makes it possible to stabilize the fluid through the additional exchange of momentum and to homogenize it in connection with the flow. As a result of the vibrations in the frequency range of at most 1 kHz, it is possible to reduce particle agglomerates for entry into the nozzle gap or to break them open with the aid of shear forces in the flow. The same applies to the growth of agglomerates and the formation of sedimentation zones. The vibration device thus makes it possible to increase these energy components without affecting the process stability of the coating. As a result, the coating can take place without interruption and thus with consistent quality.
  • the vibration device is designed to excite the nozzle body with a lower limit frequency of at least 1 Hz.
  • the frequency range used by the vibration device is between 1 Hz and 1 kHz.
  • a preferred frequency range is in the order of magnitude between 60 Hz and 70 Hz.
  • the selected frequency can be dependent on aspects of the slot nozzle and the properties of the coating fluid, in particular the particle properties (size and / or particle size distribution) and their concentrations. Differences in density of the particles in the liquid and adhesion forces between the particles themselves and the inner walls of the nozzle determine the processes to a great extent.
  • the suitable frequency can be different for different types and / or compositions of coating fluids.
  • the frequency that is suitable for a particular coating fluid can be found in particular through experiments.
  • Other parameters that can influence the optimal frequency or the optimal frequency range are the position of the vibration unit on the nozzle, the local flow conditions and the application method with the slot nozzle.
  • the shape of the nozzle gap can also influence the optimal frequency.
  • the mechanical amplitude of the vibration device in relation to the nominal diameter of the particles contained in the fluid is greater than or equal to 0.1.
  • the mechanical amplitude of the vibration device is at most 5 mm.
  • an amplitude for the largest particle diameter can be determined comprehensively.
  • the amplitude here is a full oscillation length of the vibration device from one end to the other end (peak-to-peak).
  • This does not exclude the choice of smaller amplitudes according to the particle size distribution range from the application of the principle of the method, since an excitation of particle fractions can also serve the purpose.
  • the mechanical amplitude of the vibration device is strongly dependent on the shape, mounting and mass of the slot nozzle.
  • nozzle body there are location and frequency-dependent amplitudes in the nozzle body.
  • a suitable mechanical The amplitude is also limited by the need for an error-free application on the substrate moving relative to the nozzle.
  • the suitable mechanical amplitude can be found, for example, through experiments.
  • the mechanical amplitude of the vibration device is proportional to the maximum acceleration forces, which in turn is approximately proportional to the forces acting on the particles. The higher the acceleration, the better the intended effect.
  • the criterion in the following equation is a de-dimensioned representation of the acceleration with reference to the acceleration due to gravity g. The value 100 is seen as an appropriate upper limit.
  • the upper limit value for the maximum amplitude of the vibration device can be determined.
  • ⁇ is here half the peak-to-peak amplitude / the frequency with which the vibration device is operated.
  • the use of the vibration unit enables the factor between the maximum particle size and the selectable nozzle gap to be minimized under the given conditions. This makes it possible to use larger particle fractions without endangering the uniform application of the slot nozzle.
  • the vibrations homogenize the flow behavior and stabilize the state of the fluid, thus enabling better processing and process stability.
  • the influence of the manufacturing tolerances of the inner nozzle surfaces on the flow process can be reduced by the vibration. This allows the homogeneity of the wet film of the coating Realize or optimize processing fluids in width and length through the introduced mechanical vibrations.
  • the mechanical amplitude of the vibration device acts on the nozzle body in a direction corresponding to the transport direction of the substrate.
  • the mechanical amplitude of the vibration device can act in the main flow direction (i.e. in the vertical direction) and further along the nozzle body (i.e. in its width direction).
  • An oscillation with mechanical amplitudes in one or more spatial directions reduces or prevents the formation of agglomerates and / or sedimentation zones in the fluid or on the inner surfaces of the nozzle. In this way, coating errors and the clogging of the nozzle gap can be prevented.
  • a further expedient embodiment provides that a pseudoplastic coating fluid is applied to the substrate with the aid of the wide slot nozzle described.
  • Almost all coating fluids, especially those with particles, have what is known as pseudoplastic behavior.
  • the viscosity is not a material constant, but rather depends not only on pressure and temperature but also on the shear and the duration of a shear.
  • a characteristic of pseudoplastic behavior is an increasing decrease in viscosity with the onset of shear. The course of the viscosity as a function of the shear is also different. A limiting viscosity can be established, but local maxima and a strong increase in viscosity are also possible.
  • This sometimes sensitive Fluidverhal th can, in conjunction with the manufacturing accuracy of the nozzle, in particular the nozzle inner surfaces and the nozzle lip, adversely affect the lateral distribution of the fluid in the slot nozzle.
  • the use of the vibration device has a homogenizing and stabilizing effect on the fluid. This reduces the inlet length and local boundary layer in the nozzle gap, for example. The flow conditions are therefore more homogeneous in cross-section. The influence of the manufacturing accuracy on the uniform distribution can thus be reduced depending on the application. the. As a result, an improvement in the lateral distribution is basically made possible with the same manufacturing accuracy.
  • the nozzle gap has a width between 10 mm and 5 m in a width direction which extends transversely to the transport direction.
  • the nozzle gap preferably has an exclusively linear, i.e. straight, extension, but can, for example, be curved in the width direction which extends transversely to the transport direction.
  • the nozzle gap has a slot width between 10 ⁇ m and 2.5 mm.
  • the slot width is selected in particular as a function of the size of the particles contained in the coating fluid.
  • the nominal diameter of the particles has to be smaller than the selected slot width.
  • a slot width of 200 ⁇ m results in a maximum particle size of 200 ⁇ m. In practice, however, the particles have to be smaller, otherwise the nozzle would clog immediately.
  • the vibration unit described enables the tolerance for large particles and high particle concentrations to be improved.
  • Another useful embodiment provides that a fastening device of the slot nozzle, with which the nozzle body is mechanically firmly connected, is mounted via damper elements. This ensures that the vibrations generated by the vibration device can act in the desired manner exclusively or largely on the nozzle body and the coating fluid located therein.
  • a method for operating a slot nozzle according to one or more configurations is proposed.
  • the vibration device is controlled in such a way that the nozzle body is excited with an upper limit frequency of at most one kHz.
  • the method has the same advantages as those described above in connection with the device according to the invention.
  • the nozzle body is excited with a lower limit frequency of at least 1 Hz.
  • the mechanical amplitude of the vibration device in relation to the nominal diameter of the particles contained in the fluid is selected to be greater than or equal to 0.1.
  • the mechanical amplitude of the vibration device is selected in such a way that it carries a maximum of 5 mm.
  • FIG. 1 shows a section through a slot nozzle according to the invention, which is mounted on a fastening device
  • FIG. 2 is a side view of the slot nozzle shown in FIG. 1; FIG.
  • FIG. 3 shows a section along the line III-III through the wide slot nozzle shown in FIG. 2, a vibration device being mechanically connected to the wide slot nozzle;
  • FIG. 4 shows a partial section through the fastening device of the slot die according to FIG. 2.
  • a slot nozzle 1 for applying a fluid provided with particles to a substrate 20 which is arranged below the slot nozzle 1.
  • the distance between the substrate 20 and the slot nozzle 1 and the components of the slot nozzle 1 are for reasons of the drawing not shown to scale.
  • the fluid is referred to below as the coating fluid.
  • a coordinate system is shown in which q denotes a transverse direction, h denotes a height direction and b denotes a width direction of the slot nozzle 1.
  • the transverse direction q runs in a direction which corresponds to a transport direction TR of the substrate 20.
  • the width direction b ver runs in a plane defined by the transverse and width directions transverse to the transport direction TR.
  • the coating fluid contains one or more different liquids, e.g., one or more solvents, and one or more particulate solids. Particle concentration, size, density and shape in the coating fluid are selected according to a present application. Frequently encountered use cases are shown at the end of the description.
  • the slot nozzle 1 comprises a nozzle body 2, which is formed, for example, from two nozzle halves 3, 4.
  • a nozzle inner chamber 6 is formed between the nozzle halves 3, 4, which in the cross-sectional representation shown has the shape of a circle, merely by way of example.
  • a nozzle film 5 of a predetermined thickness is arranged between the nozzle halves 3, 4, a nozzle film 5 of a predetermined thickness. This defines the slot width of a nozzle gap 7 in the lower region of the nozzle body 2 between opposing walls 7a, 7b of the respective nozzle halves 3, 4 and, together with the nozzle halves 3, 4, encloses the fluid in the nozzle interior chamber 6.
  • the nozzle film 5 has a recess for the nozzle inner chamber 6 and the nozzle gap 7 accordingly to the required coating width in the width direction b.
  • the slot width of the nozzle gap 7 thus corresponds to the thickness of the nozzle film 5.
  • the slot width is selected in the application so that the slot nozzle essentially enables the desired uniform distribution through sufficient pressure loss of the nozzle gap.
  • the minimum nozzle gap width is limited by the particles in the fluid.
  • the slot width is always at least slightly larger than the particle size of the particles contained in the coating fluid.
  • the nozzle gap 7 preferably has a slot width between 10 ⁇ m and 2.5 mm.
  • the substrate 20 is a flat substrate, for example a film made of plastic, aluminum or paper or another material to be coated.
  • the distance between the substrate 20 and a nozzle lip 9, which faces the side of the substrate 20 to be coated, can be between a few micrometers and a few centimeters.
  • the nozzle gap 7 can, depending on the selected application, have a width between 10 mm and 5 m in the width direction b.
  • the coating fluid is applied at the exit point between the two nozzle lips 9 and the substrate 20.
  • a uniform distribution can be achieved with a slot nozzle, mainly caused by the viscous forces.
  • the resulting pressure loss is largely caused by the flow through the nozzle gap 7, which leads to great pressure forces from the inside on the nozzle body.
  • This pressure loss is set in a targeted manner in order to achieve uniform distribution, but is technically limited by the elasticity values of the materials of the nozzle body. Viscosities that are too high can lead to a deflection of the nozzle gap and consequently affect the uniform distribution.
  • the nozzle body 2 is mechanically connected to a fastening device 10.
  • the fastening device 10 comprises a first holding element 11 and a second Holding element 12.
  • the first holding element 11 has a holding extension 11F.
  • the second holding element 12 has a corresponding engagement extension 12F.
  • the second holding element 12 is mechanically connected to the nozzle half 4 by way of example.
  • the second holding element with the nozzle body 2 attached to it can be brought into engagement with the first holding element 11 via the engagement extension 12F.
  • the first and second holding elements 11, 12 are mechanically connected to one another via a fixing element 13, which braces the engagement extension 12F and the holding extension 11F.
  • the holder shown is therefore designed as a so-called dovetail only by way of example. Which bracket is actually chosen is not specified.
  • a damper element 14 is located between the first holding element 11 and the second holding element 12 and between the second holding element 12 and the fixing element 13 a damper element 15 is provided.
  • FIGS. 2 to 4 which show different details of the wide slot nozzle 1 shown in FIG. 1, the vibration device 16 is shown, which is mechanically coupled to the nozzle body 2.
  • the vibration device 16, operated for example with compressed air, hydraulically or electrically, is arranged on a side of the nozzle body 2 facing away from the nozzle gap 7.
  • the mechanical fastening can take place, for example, using screws and the like.
  • the vibration device 16 is designed to set the nozzle body 2 and thus the nozzle gap 7 and the coating fluid located in the nozzle inner chamber 6 in vibration.
  • the vibration device 16 is designed in such a way that this mechanical amplitude is generated primarily in the transverse direction q and height direction h of the nozzle body 2.
  • a mechanical amplitude can also be generated by the vibration device in the width direction b of the nozzle body 2.
  • the vibration device 16 is such designed and operated that the mechanical amplitude acts both in the transverse direction q and in the height direction h.
  • the mechanical amplitude of the vibration device 16 is greater than or equal to 0.1 in relation to the nominal diameter of the particles contained in the fluid.
  • the mechanical amplitude of the vibration device 16 is preferably at most 5 mm. In the case of particle size distributions, the amplitude with the largest particle diameter can be determined. However, this does not exclude the choice of smaller amplitudes in accordance with the particle size distribution range from the application of the method principle, since the excitation of particle fractions can also serve the purpose.
  • the vibration device is operated with a frequency in a range between 1 Hz and 1 kHz. The optimal frequency and the exact mechanical deflection of an application depend on a large number of parameters.
  • the shape and material of the slot nozzle 1, the shape of the nozzle inner chamber 6 and the nozzle gap 7, the coating fluid and its flow play a role.
  • the application site at the nozzle gap opening 7L and the two nozzle lips 9 are typically wetted with the coating fluid during coating.
  • a fluid contingent is created upstream of the nozzle gap that is enclosed and also stimulated by the contact with the nozzle lip 9 and thus also determines the process.
  • the vibration device 16 introduces kinetic energy into the nozzle body 2 and the coating fluid by means of mechanical amplitudes. This makes it possible to stabilize the fluid through the additional exchange of momentum and to homogenize it in connection with the flow. Furthermore, agglomerates of the particles contained in the coating fluid can be broken up and sedimentation zones in the nozzle inner chamber 6 can be avoided. The growth of particle agglomerates can also be avoided by the introduced kinetic energy. The vibration device 16 makes it possible to to increase the kinetic energy share without significantly influencing the process stability of the coating process.
  • FIGS. 3 and 4 each show different partial sections through the slot nozzle 1 shown in FIG. 2. While FIG. 3 shows a section through the nozzle body 2 (in this illustration the nozzle gap 7 is not shown explicitly ), Fig. 4 shows a partial section through the fastening device 10, the nozzle body 2 being shown uncut.
  • the process engineering basis of the uniform, full-surface application of the coating fluid with the aid of the slot nozzle 1 is the pressure loss generated in the nozzle gap 7.
  • the pressure loss arises essentially through the nozzle gap 7, the connection of the nozzle inner chamber 6 with the nozzle gap opening 7L and the exit point of the coating fluid from the nozzle gap opening 7L.
  • the pressure loss for a sufficient uniform distribution on the substrate 20 can be achieved by the selection of the nozzle film 5, the thickness of which is equivalent to the slot width of the outlet gap, i.e. the nozzle gap opening 7L.
  • the pressure loss due to the mechanical deflection of the slot nozzle 1 due to pressure forces is limited.
  • the vibration unit 16 By using the vibration unit 16, the particle size can be selected to be larger in relation to the nozzle gap. It is thus possible to choose smaller gap thicknesses for a coating fluid with particles. A slot nozzle thus enables a larger range of realizable wet film thicknesses.
  • the use of the vibration unit also has an influence on the stability of the homogeneity of the coating fluid, which increases the range of processing speeds that can be achieved.
  • the vibrations have a balancing effect on the formation and shape of the boundary layer in the nozzle gap, which is advantageous in connection with the process stability and the manufacturing accuracy of the nozzle gap of the slot die.
  • the homogeneity of the wet film on the substrate can be optimized in width and length by the mechanical vibrations introduced in addition to the influence of the pressure loss.
  • the frequency of the flow is not selected in the ultrasonic range, but significantly below, preferably with an upper limit of 1 kHz.
  • the set frequency in particular in conjunction with a suitably selected mechanical amplitude, enables kinetic energy to be introduced into the nozzle body 2. This enables the exchange of pulses in the coating fluid to be improved and thus has a homogenizing and stabilizing effect in conjunction with the flow. This behavior makes it possible to reduce sedimentation zones and / or particle agglomerates for entry into the nozzle gap 7 with the support of the shear forces of the flow or to prevent their formation.
  • the nozzle described above can be used in a variety of different applications.
  • the slot nozzle is preferably adapted to all process and operating conditions as far as possible.
  • the following applications are possible, for example:
  • substrates known as sheets are coated.
  • the nozzle is mounted vertically in an applicator, with the coating fluid emerging downwards.
  • Robotic arms can also be used to move the slot nozzle.
  • the substrate materials are plastic films or glass. Wet film thicknesses are in the range of 10 ⁇ m.
  • the coating media contain resins, some volatile organic solvents and more often particles, e.g. optical functional coatings.
  • the processing takes place sequentially, drying through the thin layers without a dryer, for example in the case of a UV lacquer, using a UV lamp.
  • the production speeds are in the range of 0.01 to 5 m / min relative speed of the nozzle to the substrate. The requirements for order tolerances are sometimes very high.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne une buse à fente large pour l'application d'un fluide contenant des particules, ladite buse à fente large ayant un corps de buse (2). Le corps de buse (2) comprend une chambre interne de buse (6) pour recevoir le fluide contenant des particules. Le fluide contenant les particules peut être distribué par l'intermédiaire d'un espace de buse (7), qui est délimité par deux parois, sur un substrat (20) se déplaçant dans une direction de transport (TR) par rapport à la buse à fente large. Un dispositif de vibration (16) est accouplé mécaniquement au corps de buse (2) afin d'amener l'espace de buse (7) et le fluide situé dans la chambre interne de buse (6) et contenant les particules à vibrer. Le dispositif de vibration (16) est conçu pour exciter le corps de buse (2) à une fréquence limite supérieure de 1 kHz au maximum.
EP20820090.7A 2019-12-19 2020-12-02 Buse à fente large et procédé de fonctionnement d'une buse à fente large Pending EP4076769A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019220151.2A DE102019220151A1 (de) 2019-12-19 2019-12-19 Breitschlitzdüse und Verfahren zum Betreiben einer Breitschlitzdüse
PCT/EP2020/084277 WO2021122001A1 (fr) 2019-12-19 2020-12-02 Buse à fente large et procédé de fonctionnement d'une buse à fente large

Publications (1)

Publication Number Publication Date
EP4076769A1 true EP4076769A1 (fr) 2022-10-26

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EP20820090.7A Pending EP4076769A1 (fr) 2019-12-19 2020-12-02 Buse à fente large et procédé de fonctionnement d'une buse à fente large

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US (1) US20230011054A1 (fr)
EP (1) EP4076769A1 (fr)
JP (1) JP7495986B2 (fr)
KR (1) KR102666663B1 (fr)
DE (1) DE102019220151A1 (fr)
WO (1) WO2021122001A1 (fr)

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CA869959A (en) 1971-05-04 A. Sarnack George Coating apparatus
JP2003164788A (ja) 2001-12-03 2003-06-10 Fuji Photo Film Co Ltd 塗布装置
DE102004008168B4 (de) * 2004-02-19 2015-12-10 Voxeljet Ag Verfahren und Vorrichtung zum Auftragen von Fluiden und Verwendung der Vorrichtung
JP5061421B2 (ja) * 2004-03-24 2012-10-31 東レ株式会社 塗布方法およびディスプレイ用部材の製造方法
JP2007268385A (ja) * 2006-03-30 2007-10-18 Fujifilm Corp 塗布装置、塗布方法、および光学フィルムの製造方法
DE102007014805A1 (de) * 2006-03-31 2007-10-04 Basf Ag Verfahren und Vorrichtung zur Beschichtung von Substraten
DE102009017453A1 (de) 2009-04-07 2010-11-11 Hüttlin, Herbert, Dr. h.c. Spaltdüse zum Versprühen einer Flüssigkeit
DE102009021077A1 (de) * 2009-05-13 2010-11-25 Fleissner Gmbh Verfahren und Vorrichtung zum Auftrag eines fluiden Mediums auf eine textile Warenbahn
JP2011224417A (ja) * 2010-04-15 2011-11-10 Seiko Epson Corp 塗布装置および表示シートの製造方法
US20130280443A1 (en) * 2012-04-19 2013-10-24 Edward Francis Andrewlavage, JR. Flow applicator apparatus and methods of applying a layer of cement material to a honeycomb body
JP2014060014A (ja) 2012-09-14 2014-04-03 Dainippon Screen Mfg Co Ltd 電池用電極製造方法及び電池用電極製造装置
JP6223733B2 (ja) * 2013-05-20 2017-11-01 日本電産マシナリー株式会社 液剤吐出装置
JP6929186B2 (ja) 2017-10-10 2021-09-01 日産自動車株式会社 電池用電極の製造方法

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DE102019220151A1 (de) 2021-06-24
US20230011054A1 (en) 2023-01-12
KR20220112294A (ko) 2022-08-10
WO2021122001A1 (fr) 2021-06-24
KR102666663B1 (ko) 2024-05-20
JP2023507452A (ja) 2023-02-22
JP7495986B2 (ja) 2024-06-05

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