EP1222967A2 - 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
EP1222967A2
EP1222967A2 EP02000318A EP02000318A EP1222967A2 EP 1222967 A2 EP1222967 A2 EP 1222967A2 EP 02000318 A EP02000318 A EP 02000318A EP 02000318 A EP02000318 A EP 02000318A EP 1222967 A2 EP1222967 A2 EP 1222967A2
Authority
EP
European Patent Office
Prior art keywords
spray
liquid
jet
additional liquid
spray 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.)
Granted
Application number
EP02000318A
Other languages
German (de)
English (en)
Other versions
EP1222967B1 (fr
EP1222967A3 (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 spraying method and a spraying device for Coating liquid according to the preamble of claim 1 and of Claim 6.
  • Spray devices with a rotary atomizer body in the form of a rotating bell for atomizing and spraying coating liquid an object to be coated are from 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 that Rotary atomizer and / or the spray coating liquid on electrical high voltage potential, which is a negative or positive High voltage potential can be connected. The high voltage lies usually in the range between 4,000 V and 140,000 V.
  • a high-voltage spray device with a non-rotating spray nozzle is from US 3,731,145 known.
  • Rotary atomizer bodies usually have a bell shape or one Disc shape and can rotate at up to 60,000 rpm.
  • the coating liquid can be solvent-based or be water-dilutable liquid, in particular paint, colored lacquer, or Clearcoat.
  • the different types of coating liquids have different ones Viscosities and different drying speeds.
  • the Liquid particles in the spray jet have different shapes, sizes and Flight characteristics on the way from the liquid atomizer to the coating object.
  • the high voltage creates an electrostatic field between the Spray device and an electrically conductive, grounded, to be coated Object. This reduces scatter losses in the spray jet and makes them faster Coating speeds and better coating qualities.
  • the adherence of the liquid particles to the object to be coated are depending on the type of coating liquid and the electrostatic Field.
  • the object of the invention is to be achieved in simple and inexpensive manner Way of coating efficiency and coating quality influence.
  • the invention relates to a spraying method for coating liquid, in which from a spray device through a liquid atomizer Form of a non-rotating nozzle or in the form of a rotating Rotating atomizer body coating liquid on a to be coated Object is sprayed, characterized in that in the spray jet Coating liquid an additional liquid is metered and thus supplied the microclimate in the spray jet is influenced.
  • the invention further relates to a spray device for coating liquid, containing a liquid atomizer in the form of a non-rotating nozzle or in the form of a rotating rotary atomizer body for spraying the Coating liquid on an object to be coated, thereby characterized in that an additional liquid supply device for metered supply of additional liquid is provided in the spray jet of the coating liquid is.
  • This metered supply of additional liquid on or in the spray jet Coating liquid can affect the "microclimate" in the spray jet and thus also the Coating efficiency and the coating quality affected and the can be adapted to different conditions in practice.
  • the "microclimate” contains in particular the moisture content in the spray jet and the ratio of volatiles to non-volatiles Ingredients in the spray jet.
  • the color particles of low viscosity Coating liquids by adding additional liquid be “diluted” and thereby better atomized in the spray as well are better charged electrostatically.
  • additional liquid it has also affect the electrical current generated by the spray from the Spray device flows to the grounded object to be coated.
  • the Additional liquid also influences the fluidity of the liquid particles Coating liquid on the object to be coated.
  • Cooled coating liquid in the spray device before its atomization e.g. B. in the liquid atomizer body or upstream thereof. This will make the Viscosity and the rate of evaporation (drying out) of the Coating liquid reduced. This also makes the "microclimate” influenceable and the coating efficiency and the coating quality improvable.
  • water for water-dilutable is expediently Coating liquids or solvents for solvents Coating liquids used.
  • the additional liquid is preferably in the initial region of the spray jet fed before its full diameter by the Additional liquid supply device in the initial area of the spray jet is judged.
  • the Characteristics of this spray different types of objects and can be adapted to different types of coating liquids.
  • the object surface to be coated is vertical or horizontal.
  • the Spray jet axis around or partially extending slot nozzle or one or a plurality of round or arranged around the spray jet axis angular openings, in particular nozzle openings, on the spray device be provided.
  • the spray device can have one or more of the following compressed air supplies: shaping air, which on the spray is applied, for example surrounding it in a bell shape and with flows with him to shape him; Bearing air on which the Rotary atomizer body and / or a turbine driving it is mounted; Turbine air for driving the turbine; Break air to Braking the turbine and the rotary atomizer body.
  • shaping air which on the spray is applied, for example surrounding it in a bell shape and with flows with him to shape him
  • Turbine air for driving the turbine
  • Break air to Braking the turbine and the rotary atomizer body.
  • One or more Types of this air can be cooled according to the invention and as Cooling medium for cooling the coating liquid in the spray device be used.
  • the spray device 2 shown in the drawings according to the invention for Coating liquid contains a liquid atomizer in the form of a an air turbine (not shown) drivable rotary atomizer body 4.
  • This is preferably an atomizer bell or an atomizer disc rotates about an axis of rotation 6, an outer peripheral surface 8 and a front End face 10 has.
  • the end face 10 has a bell shape (or plate shape). about the rotating end face 10 flows radially from the inside to the outside Coating liquid flowing from the bell rim 12, i.e. the Outer peripheral edge of the end face 10, by the centrifugal force of the rotating Rotary atomizer body 4 in the form of a forward spray 14 is delivered.
  • the rotary atomizer body 4 is preferably at high electrical voltage to create a high voltage field between it and the coating object connected.
  • a supply device 16 for the metered supply of additional liquid 18 and / or in the spray jet 14 contains itself (on or) through a housing 20 of the spray device extending auxiliary liquid line 22 to an on (on or outlet body 24 arranged in the housing 20.
  • the outlet body 24 has at least one, for example three outlet openings 26 through which the Additional liquid 18 flows forward into the spray jet 14.
  • the additional liquid line 22 is at the rear end of the housing 20 through a external auxiliary liquid supply line 30, which has a controllable valve 32 contains, connected to a supply container 34, in which the Additional liquid 18 is stored.
  • the additional liquid 18 can be the same electrical high voltage can be connected like the rotary atomizer body 4 and therefore stands on electrical insulators 36 on a base 38.
  • FIG. 1 shows another embodiment in which Supply container 34 through a gas pressure control device 42 a gas pressure is generated, preferably compressed air from a compressed air source 34, through which at open valve 32 additional liquid 18 from the supply container 34 to Outlet body 24 and is pressed into the spray 14 by this.
  • the additional liquid 18 is preferably water if the Coating liquid of the spray jet 14 is a water-soluble substance.
  • the additional liquid is preferably a solvent if the Coating liquid of the spray jet 14 is a solvent-containing substance.
  • the supply of additional liquid in the spray jet 14 enables one Change and adaptation of the spray mist consistency or the microclimate of the Spray jet 14 for various coating liquids.
  • the device for supplying coating liquid to the Rotary atomizer body 4 is not shown since it is from the prior art is known, for example from US 4,275,838 and US 4,505,430.
  • the at least one outlet opening 26 for additional liquid 18 can be one have a circular or angular cross section or a slot shape, for example be a slit nozzle that extends around part or all of it Device scope extends around the axis of rotation 6.
  • the additional liquid 18 is metered into the spray jet 14. So that can the microclimate (moisture content, temperature, viscosity) in the liquid jet 14 depending on operating conditions such as type of Coating liquid and type of object to be coated are affected during coating efficiency and coating quality be improved.
  • microclimate moisture content, temperature, viscosity
  • the additional liquid 18 becomes the initial area of the liquid jet 14 supplied before the liquid jet 14 reaches its largest diameter Has.
  • the additional liquid 18 is preferably directly at the front end of the Liquid atomizer 4 fed to the spray jet 14.
  • the outlet opening or openings 26 can be used as nozzle openings be formed, from which the additional liquid 18 as a bundled jet or emerges as an atomizing jet.
  • the additional liquid 18 can flow from the at least one outlet opening 26 either be directed directly into the spray 14 or such that at least part or all of the additional liquid 18 from the Outlet openings 26 on the outer peripheral end portion 46 of the Rotary atomizer body 4 arrives and from this Outer peripheral end portion 46 is directed into the spray 14.
  • the Feed device 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 as Liquid jet emerges from the outlet openings 26, or formed in such a way be that the additional liquid only drops from the outlet openings 26th emerges and on the outer peripheral end portion 46 of Rotary atomizer body 4 drips.
  • the rotation of the rotary atomizer body 4 generates a centrifugal force through which the additional liquid 18 from its Outer peripheral end portion 46 into the spray 14 of the coating liquid is thrown out.
  • the spraying of at least part of the additional liquid 18 on the Outer peripheral end portion 46 of the rotary atomizer body 4 has the additional advantage that there is none on this outer peripheral end section 46 Can deposit particles of the coating liquid and harden there. Consequently this outer peripheral end portion 46 is kept clean.
  • a cooling device 50 for cooling one of the coating liquid on its way to the spray jet 14 contacted device part, in the present embodiment of the Rotary atomizer body 4, by means of a flowable, cooled medium provided during the spray coating operation to the cold of the cooled cooling medium through the cold-conductive device part 4 transfer the spray coating fluid before it is sprayed.
  • the cooling medium 52 is behind the Outer peripheral end portion 46 directed to the outer peripheral surface 54 and the Cooling of the coolant 52 is caused by the rotary atomizer body 4, which is cold conductive, for example made of metal, on the coating liquid transferred, which flows through it and then as a spray 14 is sprayed.
  • the cooling device 50 guides the coolant 52, preferably cooled compressed gas, in particular cooled compressed air, in a cooling medium line 56 to one Coolant outlet 58, which on the outer peripheral surface 54 of the Rotary atomizer body 4 is directed.
  • the cold of the cooling medium runs through the rotary atomizer body 4 through to its end face 10, over which the coating liquid when spun off by the rotating Rotary atomizer body 4 flows and from the outer edge of the body in the form of Spray jet 14 is thrown off.
  • a cooling device 60 for cooling the cooling medium 52 is preferably immediate arranged on the spray device 2 or integrated into this. This results in short paths for the cooling medium 52.
  • the cooling medium 52 preferably a Compressed gas, for example compressed air from a compressed air source 64, becomes the cooling device 60 metered in via a metering device 66 (e.g. valve arrangement), from cooled the cooling device 60 and then through the cooling medium line 56 to the Rotation atomizer body 4 directed.
  • the cooling device 60 can be used to cool the Cooling medium 52 preferably contain a so-called cooling gas cartridge.
  • the cooling of the rotary atomizer body by the cooling medium 52 has the Another advantage that it is the rotary atomizer body in its Outer peripheral end portion 46 cools. On this outer peripheral end portion 46 sometimes migrate backward from the spray 14 Be Anlagenungs remplikeitsteilchen. Due to the reduced temperature, this can Coating liquid particles on the outer peripheral end portion 46 only harden and glue at a much lower speed than with a warmer temperature. This means that less cleaning work is required.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
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
DE10101372 2001-01-13
DE10101372A DE10101372A1 (de) 2001-01-13 2001-01-13 Sprühverfahren und Sprühvorrichtung für Beschichtungsflüssigkeit

Publications (3)

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

Families Citing this family (4)

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ATE330495T1 (de) * 2003-01-31 2006-07-15 Hauni Maschinenbau Ag Verfahren zum beleimen einer bewegten bahn, sowie vorrichtung, insbesondere zur durchführung des verfahrens
US8602326B2 (en) 2007-07-03 2013-12-10 David M. Seitz Spray device having a parabolic flow surface
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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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731145A (en) 1970-11-23 1973-05-01 Nordson Corp Electrostatic spray gun with self-contained miniaturized power pack integral therewith
US4275838A (en) 1977-09-12 1981-06-30 Ransburg Corporation Rotating atomizing device
DE3000002A1 (de) 1980-01-02 1981-07-09 Ernst Mueller Gmbh & Co, 7057 Winnenden Elektrostatische farbspritzpistole mit rotationszertaeuber
US4505430A (en) 1982-11-22 1985-03-19 Ransburg Corporation Self-cleaning atomizer
DE3509874A1 (de) 1985-03-19 1986-09-25 Hermann Behr & Sohn Gmbh & Co, 7121 Ingersheim Einrichtung zum vernebeln fluessiger farbe

Also Published As

Publication number Publication date
CA2367254C (fr) 2007-04-17
CA2367254A1 (fr) 2002-07-13
EP1222967B1 (fr) 2009-10-14
DE50213910D1 (de) 2009-11-26
DE10101372A1 (de) 2002-08-01
EP1222967A3 (fr) 2003-11-12
US20020092922A1 (en) 2002-07-18
US6857581B2 (en) 2005-02-22

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