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EP1222967B1 - Procédé et appareil pour pulvériser un liquide de revêtement - Google Patents

Procédé et appareil pour pulvériser un liquide de revêtement Download PDF

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Publication number
EP1222967B1
EP1222967B1 EP02000318A EP02000318A EP1222967B1 EP 1222967 B1 EP1222967 B1 EP 1222967B1 EP 02000318 A EP02000318 A EP 02000318A EP 02000318 A EP02000318 A EP 02000318A EP 1222967 B1 EP1222967 B1 EP 1222967B1
Authority
EP
European Patent Office
Prior art keywords
liquid
spray
additional
spray coating
jet
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.)
Expired - Lifetime
Application number
EP02000318A
Other languages
German (de)
English (en)
Other versions
EP1222967A3 (fr
EP1222967A2 (fr
Inventor
Ronald Steiger
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.)
Carlisle Fluid Technologies Germany GmbH
Original Assignee
ITW Oberflaechentechnik 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 ITW Oberflaechentechnik GmbH filed Critical ITW Oberflaechentechnik GmbH
Publication of EP1222967A2 publication Critical patent/EP1222967A2/fr
Publication of EP1222967A3 publication Critical patent/EP1222967A3/fr
Application granted granted Critical
Publication of EP1222967B1 publication Critical patent/EP1222967B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/001—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means incorporating means for heating or cooling, e.g. the material to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0426—Means for supplying shaping gas

Definitions

  • the invention relates to a spray coating method and a coating liquid spray coating apparatus according to the preamble of claim 1 and claim 8.
  • the US 5,914,153 shows a spray coating apparatus with a sputtering bell for atomizing coating liquid. During the spray coating operation, without interrupting it, solvent is occasionally sprayed onto the bell back to dissolve deposits of coating liquid from time to time and flush it into the spray stream.
  • Spraying devices having a rotary atomizing body in the form of a rotating bell for atomizing and spraying coating liquid onto an object to be coated are known from US 5,178,237 US 4,275,838 ; US 4,505,430 ; DE 30 00 002 A1 and DE 35 09 874 A1 known. From this it is also known to connect the rotary atomizers and / or the spray coating liquid to a high voltage electrical potential, which may be a negative or positive high voltage potential. The high voltage is usually in the range between 4,000 V and 140,000 V.
  • a high-voltage spray device with a non-rotating spray nozzle is out of the US 3,731,145 known.
  • Rotary atomizer bodies are usually bell-shaped or disc-shaped and can rotate at up to 60,000 rpm.
  • the coating liquid may be a solvent-containing or a water-dilutable liquid, in particular color, colored lacquer or clear lacquer.
  • the different types of coating liquids have different viscosities and different drying rates.
  • the liquid particles in the spray jet have different shapes, sizes and flight characteristics on the way from the liquid atomizer to the object to be coated.
  • the high voltage creates an electrostatic field between the spray device and an electrically conductive grounded object to be coated. This reduces scattering losses in the spray jet and produces faster coating speeds and better coating qualities.
  • the adhesiveness of the liquid particles on the object to be coated depends on the type of coating liquid and the electrostatic field.
  • the "microclimate" in the spray By the metered supply of additional liquid on or in the spray of the coating liquid, the "microclimate" in the spray and thus the coating efficiency and the coating quality can be influenced and adapted to the various conditions in practice.
  • the "microclimate” includes the moisture content in the spray and the ratio of volatiles to non-volatiles in the spray.
  • the paint particles of low-viscosity coating liquids can be "diluted” by the addition of additional liquid and thereby be better atomized in the spray and better electrostatically charged.
  • additional liquid it also has an influence on the electric current which flows with the spray from the spraying device to the earthed object to be coated.
  • the additive liquid also affects the fluidity of the liquid particles of the coating liquid on the object to be coated.
  • the coating liquid in the spraying device is cooled prior to its atomization, e.g. In the liquid atomizer body or upstream thereof. This reduces the viscosity and evaporation rate (drying out) of the coating liquid.
  • the "microclimate” can also be influenced and the coating efficiency and coating quality can be improved.
  • water for water-dilutable coating liquids or solvents for solvent-containing coating liquids it is expedient to use water for water-dilutable coating liquids or solvents for solvent-containing coating liquids.
  • the supplemental liquid is supplied to the initial portion of the spray jet before it has its full diameter by directing the auxiliary liquid supply means into the initial region of the spray jet.
  • the properties of this spray jet can be adapted to different types of objects and different types of coating liquids. This can also take into account whether the object surface to be coated is vertical or horizontal. For example, there is a risk in vertical or oblique object surfaces that the sprayed coating liquid runs down.
  • a slot nozzle extending completely or partially around the spray jet axis or one or a plurality of round or round nozzles arranged around the spray jet axis can be provided angular openings, in particular nozzle openings, are provided on the spraying device.
  • the spray device may have one or more of the following compressed air supplies: shaping air, which is applied to the spray jet, for example surrounding it in a bell shape and flowing with it to form it; Bearing air (bearing air) on which the Rotationszerstäuber stresses and / or a turbine driving him is mounted; Turbine air for driving the turbine; Brake air (break air) for braking the turbine and the rotary atomizer body.
  • shaping air which is applied to the spray jet, for example surrounding it in a bell shape and flowing with it to form it
  • Bearing air bearing air
  • Turbine air for driving the turbine
  • Brake air break air for braking the turbine and the rotary atomizer body.
  • One or more types of this air may be cooled according to the invention and used as a cooling medium for cooling the coating liquid in the spray device.
  • the coating liquid spraying apparatus 2 shown in the drawings comprises a liquid atomizer in the form of a rotary atomizing body 4 which can be driven by an air turbine (not shown).
  • This is preferably a sputtering or atomizing disk which rotates about an axis of rotation 6, an outer peripheral surface 8 and a front Face 10 has.
  • the end face 10 has a bell shape (or plate shape). Via the rotating end face 10, coating liquid flows radially from the inside to the outside, which is emitted from the bell rim 12, ie the outer peripheral edge of the end face 10, by the centrifugal force of the rotating rotary atomizing body 4 in the form of a forwardly directed spray jet 14.
  • the Rotationszerstäuberoasa 4 is preferably connected to electrical high voltage for generating a high voltage field between it and the object to be coated.
  • a supply device 16 for the metered supply of additional liquid 18 on and / or in the spray jet 14 contains an (on or) by a housing 20 of the spray device extending additional liquid line 22 to a (on or in) housing 20 arranged outlet 24.
  • Der Outlet body 24 has at least one, for example three outlet openings 26, via which the additional liquid 18 flows forward into the spray jet 14.
  • the additional liquid line 22 is connected at the rear end of the housing 20 by an external auxiliary liquid supply line 30 which contains a controllable valve 32 to a supply tank 34 in which the additional liquid 18 is stored.
  • the additional liquid 18 may be connected to the same electrical high voltage as the Rotationszerstäuber stresses 4 and is therefore on electrical insulators 36 on a substrate 38th
  • a pump can be provided.
  • Fig. 1 shows another embodiment in which in the supply tank 34 by a gas pressure control device 42, a gas pressure is generated, preferably compressed air of a compressed air source 34 through which 32 is pressed additional liquid 18 from the supply tank 34 to the outlet body 24 and from this into the spray jet 14 with the valve open.
  • the auxiliary liquid 18 is preferably water when the coating liquid of the spray jet 14 is a water-soluble substance.
  • the additive liquid is preferably a solvent when the coating liquid of the spray jet 14 is a solvent-containing substance. The addition of additional liquid into the spray jet 14 allows a change and adaptation of the spray consistency or the microclimate of the spray jet 14 for different coating liquids.
  • the device for supplying coating liquid to the rotary atomizer body 4 is not shown since it is known from the prior art, for example from US Pat US 4,275,838 and US 4 505 430 ,
  • the at least one auxiliary fluid outlet port 18 may have a circular or angular cross-section or slot shape, for example, a slot nozzle that extends around or around the axis of rotation 6 around or over the entire device periphery.
  • the additional liquid 18 is metered into the spray jet 14.
  • the microclimate moisture content, temperature, viscosity
  • the microclimate in the liquid jet 14 can be influenced depending on operating conditions such as the type of the coating liquid and the kind of the object to be coated, while improving the coating efficiency and coating quality.
  • the additional liquid 18 is supplied to the initial region of the liquid jet 14 before the liquid jet 14 has reached its largest diameter.
  • the additional liquid 18 is preferably supplied to the spray jet 14 directly at the front end of the liquid atomizer 4.
  • the outlet opening or outlet openings 26 may be formed as nozzle openings, from which the additional liquid 18 emerges as a bundled jet or as a spray jet.
  • the additional liquid 18 may be directed from the at least one outlet opening 26 either directly into the spray jet 14 or such that at least a part or the entirety of the additional liquid 18 passes from the outlet openings 26 on the outer peripheral end portion 46 of the Rotationszerstäuber stressess 4 and from this outer peripheral end portion 46 in the Spray jet 14 is directed.
  • the supply means 16 for the additional liquid 18, in particular the outlet openings 26 and the supply pressure of the additional liquid 18 can either be designed such that the additional liquid 18 exits as a liquid jet from the outlet openings 26, or be formed such that the additional liquid only dropwise from the outlet openings 26th leaking and dripping onto the outer peripheral end portion 46 of the rotary atomizer body 4.
  • the rotation of the Rotationszerstäuber emotionss 4 generates a centrifugal force by which the additional liquid 18 is thrown off its outer peripheral end portion 46 in the spray jet 14 of the coating liquid.
  • a further embodiment of a spraying device according to the invention shown is preferably also a cooling device 50 for cooling a device part contacted by the coating liquid on its way to the spray jet 14, in the present embodiment of the invention
  • Rotary atomizer body 4 provided by means of a flowable cooled medium during the Sprühbe Anlagenungs convincedes to transmit the cold of the cooled cooling medium through the refrigerant-conductive device part 4 on the spray coating liquid before it is sprayed.
  • the cooling medium 52 is led to the outer circumferential surface 54 behind the outer peripheral end region 46, and the cold of the coolant 52 is transferred from the rotary atomizing body 4, which is cold conductive, for example, made of metal, to the coating liquid which flows therethrough and is then sprayed as a spray jet 14 ,
  • the cooling device 50 leads the coolant 52, preferably cooled compressed gas, in particular cooled compressed air, in a cooling medium line 56 to a cooling medium outlet 58, which is directed onto the outer circumferential surface 54 of the rotary atomizer body 4.
  • the cold of the cooling medium passes through the Rotatioszerstäuberoasa 4 through to its end face 10, through which the coating liquid flows during spin-off by the rotating Rotationszerstäuber stresses 4 and is thrown off the outer edge of the body in the form of the spray jet 14.
  • a cooling device 60 for cooling the cooling medium 52 is preferably arranged directly on the spray device 2 or integrated in it.
  • the cooling medium 52 preferably a compressed gas, for example compressed air from a compressed air source 64, is metered into the cooling device 60 via a metering device 66 (eg valve arrangement), cooled by the cooling device 60 and then through the cooling medium line 56 is directed to the rotary atomizer body 4.
  • the cooling device 60 may preferably include a so-called cooling gas cartridge for cooling the cooling medium 52.
  • the cooling of the Rotationszerstäuber emotionss by the cooling medium 52 has the further advantage that it is the Rotationszerstäuber endeavor into his Outer peripheral end portion 46 cools.
  • This outer peripheral end portion 46 sometimes passes from the spray jet 14 backward wandering coating liquid particles. Due to the reduced temperature, these coating liquid particles on the outer peripheral end portion 46 can cure and stick only at a much slower rate than at a warmer temperature. This requires less cleaning work.

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)

Claims (18)

  1. Procédé de revêtement par pulvérisation de liquide de revêtement, dans lequel un dispositif de pulvérisation (2) pulvérise par un diffuseur de liquide (4) en forme de buse non rotative ou en forme de corps de diffuseur rotatif un liquide de revêtement sur un objet à revêtir, et dans lequel dans le jet de pulvérisation (14) du liquide de revêtement, on introduit un liquide supplémentaire (18) sous forme dosée,
    caractérisé en ce
    qu'une partie de dispositif (4) avec laquelle le liquide de revêtement vient en contact en chemin vers le jet de pulvérisation (14) dans le dispositif de pulvérisation, est refroidie au moyen d'un fluide de refroidissement (52) refroidi et coulant, et en ce que le froid du fluide de refroidissement est transféré par la capacité frigorigène de la partie du dispositif (4) au liquide de revêtement par pulvérisation, le microclimat dans le jet de pulvérisation étant influencé pendant l'opération de revêtement par pulvérisation par le liquide supplémentaire et par l'opération de refroidissement.
  2. Procédé de revêtement par pulvérisation selon la revendication 1,
    caractérisé en ce que
    le liquide supplémentaire (18) est acheminé à la région initiale du jet de pulvérisation (14), avant d'atteindre son diamètre total.
  3. Procédé de revêtement par pulvérisation selon la revendication 2,
    caractérisé en ce que
    le liquide supplémentaire (18) est acheminé à l'extrémité avant du diffuseur de liquide (4) ou juste en aval de celui-ci, au jet de pulvérisation.
  4. Procédé de revêtement par pulvérisation selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le liquide supplémentaire (18) est acheminé au jet de pulvérisation de manière répartie autour d'au moins une périphérie partielle du jet de pulvérisation (14).
  5. Procédé de revêtement par pulvérisation selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    qu'au moins une partie du liquide supplémentaire (18) est appliquée sur une portion d'extrémité périphérique extérieure avant (46) du diffuseur de liquide (4) et est ensuite guidée à travers celui-ci dans le jet de pulvérisation (14).
  6. Procédé de revêtement par pulvérisation selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le liquide supplémentaire (18) est acheminé en forme de jet ininterrompu au jet de pulvérisation (14) par au moins une ouverture de buse (26) qui est formée au niveau de la portion d'extrémité avant du dispositif de pulvérisation (2).
  7. Procédé de revêtement par pulvérisation selon l'une quelconque des revendications précédentes 1 à 5,
    caractérisé en ce que
    le diffuseur de liquide (4) est un corps de diffuseur rotatif et en ce que le liquide supplémentaire (18) est diffusé goutte à goutte sur la portion d'extrémité périphérique extérieure (46) du corps de diffuseur rotatif (4) et est ensuite éjecté par cette portion d'extrémité périphérique extérieure (46) sous l'effet de ses forces centrifuges rotationnelles, dans le jet de pulvérisation (14).
  8. Dispositif de revêtement par pulvérisation pour un liquide de revêtement, contenant un diffuseur de liquide (4) en forme de buse non rotative ou en forme de corps de diffuseur rotatif pour pulvériser le liquide de revêtement sur un objet à revêtir, et un dispositif d'alimentation en liquide supplémentaire (16) avec au moins une sortie (26) pour l'alimentation dosée de liquide supplémentaire (18) dans le jet de pulvérisation (14) du liquide de revêtement,
    caractérisé en ce
    qu'un dispositif de refroidissement (50) est prévu pour refroidir au moins une partie de dispositif (4) du dispositif de pulvérisation (2) au moyen d'un fluide de refroidissement (52) refroidi et coulant, le liquide de revêtement venant en contact avec cette partie de dispositif (4) en chemin vers le jet de pulvérisation (14) et la partie de dispositif pouvant être calorigène et servant au transfert de froid du fluide de refroidissement (52) au liquide de revêtement par pulvérisation, le dispositif d'alimentation en liquide supplémentaire (16) et le dispositif de refroidissement (50) étant réalisés pour influencer le microclimat dans le jet de pulvérisation pendant l'opération de revêtement par pulvérisation, par l'apport de liquide supplémentaire et l'apport de froid.
  9. Dispositif de revêtement par pulvérisation selon la revendication 8,
    caractérisé en ce que
    le dispositif d'alimentation en liquide supplémentaire (16) est réalisé pour l'alimentation du liquide supplémentaire (18) dans la région initiale du jet de pulvérisation (14) avant d'atteindre son plus grand diamètre.
  10. Dispositif de revêtement par pulvérisation selon la revendication 8 ou 9,
    caractérisé en ce que
    le dispositif d'alimentation en liquide supplémentaire (16) est réalisé pour l'alimentation du liquide supplémentaire (18) dans le jet de pulvérisation (14) à l'extrémité avant du diffuseur de liquide (4).
  11. Dispositif de revêtement par pulvérisation selon l'une quelconque des revendications 8 à 10,
    caractérisé en ce que
    le dispositif d'alimentation en liquide supplémentaire (16) est réalisé pour l'alimentation du liquide supplémentaire (18) dans le jet de pulvérisation (14) de manière répartie autour du jet de pulvérisation.
  12. Dispositif de revêtement par pulvérisation selon l'une quelconque des revendications 8 à 11,
    caractérisé en ce que
    le dispositif d'alimentation en liquide supplémentaire (16) est réalisé de manière à appliquer au moins une partie du liquide supplémentaire (18) sur une portion d'extrémité périphérique extérieure (46) du diffuseur de liquide (4), puis à le guider de cette portion d'extrémité périphérique extérieure (46) dans le jet de pulvérisation (14).
  13. Dispositif de revêtement par pulvérisation selon l'une quelconque des revendications 8 à 12,
    caractérisé en ce que
    l'au moins une sortie (26) pour le liquide supplémentaire (18) est formée au niveau de la portion d'extrémité avant du dispositif de pulvérisation (2).
  14. Dispositif de revêtement par pulvérisation selon la revendication 13,
    caractérisé en ce que
    le diffuseur de liquide (4) est un corps de diffuseur rotatif et en ce que le dispositif d'alimentation en liquide supplémentaire (16) est réalisé pour diffuser goutte à goutte le liquide supplémentaire (18) sur la portion d'extrémité périphérique extérieure avant (46) du corps de diffuseur rotatif et pour éjecter le liquide supplémentaire égoutté (18) par le corps de diffuseur rotatif sous l'effet de ses forces centrifuges rotationnelles, dans le jet de pulvérisation.
  15. Dispositif de revêtement par pulvérisation selon la revendication 13,
    caractérisé en ce que
    le dispositif d'alimentation en liquide supplémentaire (16), y compris sa au moins une sortie (26), est réalisé pour diffuser le liquide supplémentaire (18) en forme de jet ininterrompu.
  16. Dispositif de revêtement par pulvérisation selon la revendication 15,
    caractérisé en ce que
    la partie de dispositif (4) présente un point (10) avec lequel le liquide de revêtement par pulvérisation vient en contact sur son chemin vers le jet de pulvérisation (14) et un point (54) avec lequel le liquide de revêtement par pulvérisation ne vient pas en contact sur son chemin vers le jet de pulvérisation (14), et en ce que le dispositif de refroidissement (50) est réalisé pour l'acheminement du fluide de refroidissement (52) au point (54) de la partie du dispositif (4) non en contact.
  17. Dispositif de pulvérisation selon la revendication 16,
    caractérisé en ce que
    le diffuseur de liquide est un corps de diffuseur rotatif (4) à travers lequel s'écoule le liquide de revêtement et en ce que le point (54) avec lequel le fluide de refroidissement vient en contact est une surface périphérique extérieure du corps de diffuseur rotatif (4).
  18. Dispositif de revêtement par pulvérisation selon l'une quelconque des revendications 15 à 17,
    caractérisé en ce
    qu'il est réalisé pour du gaz refroidi servant de fluide de refroidissement.
EP02000318A 2001-01-13 2002-01-04 Procédé et appareil pour pulvériser un liquide de revêtement Expired - Lifetime EP1222967B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10101372A DE10101372A1 (de) 2001-01-13 2001-01-13 Sprühverfahren und Sprühvorrichtung für Beschichtungsflüssigkeit
DE10101372 2001-01-13

Publications (3)

Publication Number Publication Date
EP1222967A2 EP1222967A2 (fr) 2002-07-17
EP1222967A3 EP1222967A3 (fr) 2003-11-12
EP1222967B1 true EP1222967B1 (fr) 2009-10-14

Family

ID=7670473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02000318A Expired - Lifetime EP1222967B1 (fr) 2001-01-13 2002-01-04 Procédé et appareil pour pulvériser un liquide de revêtement

Country Status (4)

Country Link
US (1) US6857581B2 (fr)
EP (1) EP1222967B1 (fr)
CA (1) CA2367254C (fr)
DE (2) DE10101372A1 (fr)

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CN107930986A (zh) * 2017-12-08 2018-04-20 浙江华龙机械股份有限公司 一种卷烟机自流式涂胶装置
CN114308536B (zh) * 2021-12-10 2023-06-23 武汉航空仪表有限责任公司 一种无级调节式点油装置

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US6857581B2 (en) 2005-02-22
EP1222967A3 (fr) 2003-11-12
DE10101372A1 (de) 2002-08-01
CA2367254A1 (fr) 2002-07-13
EP1222967A2 (fr) 2002-07-17
DE50213910D1 (de) 2009-11-26
CA2367254C (fr) 2007-04-17
US20020092922A1 (en) 2002-07-18

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