[go: up one dir, main page]

WO2009056950A1 - Dispositif de peinture par pulvérisation à ionisation du fluide porteur - Google Patents

Dispositif de peinture par pulvérisation à ionisation du fluide porteur Download PDF

Info

Publication number
WO2009056950A1
WO2009056950A1 PCT/IB2008/002901 IB2008002901W WO2009056950A1 WO 2009056950 A1 WO2009056950 A1 WO 2009056950A1 IB 2008002901 W IB2008002901 W IB 2008002901W WO 2009056950 A1 WO2009056950 A1 WO 2009056950A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
ions
carrier
gas
paint
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2008/002901
Other languages
English (en)
Inventor
Ottavio Milli
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.)
Eurosider SAS di Milli Ottavio and C
Original Assignee
Eurosider SAS di Milli Ottavio and C
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
Priority claimed from ITBO20070732 external-priority patent/ITBO20070732A1/it
Priority claimed from ITBO20070813 external-priority patent/ITBO20070813A1/it
Application filed by Eurosider SAS di Milli Ottavio and C filed Critical Eurosider SAS di Milli Ottavio and C
Publication of WO2009056950A1 publication Critical patent/WO2009056950A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • 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
    • 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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/10—Arrangements for supplying power, e.g. charging power

Definitions

  • the present invention relates to the field of the spray painting and in particular it refers to a device intended to improve the quality of the painting.
  • airbrushes consisting of a spray gun connected to a tube transporting the carrier fluid and to a container of the paint, in such a way that when the carrier fluid is sent the airbrush provides to mix the pressurized flow of the carrier fluid with a suitable amount of paint.
  • the overspray effect involves waste of material, a poor accuracy and uniformity of the painting, and saturation of the working environment with suspended "bounce paint” particles which make much more complicated the work conditions for the users.
  • Another drawback of such known systems is to be unable to obtain a satisfactory hardness of the layer of paint and a layer more resistant to wear.
  • a further drawback is still the need to reduce to the maximum extent the use of volatile solvents for paints.
  • this aim is achieved with a device according to the main claim.
  • the advantages of the device of the invention consist essentially in the elimination of the phenomenon of the electrostatic overspray of the paint, in all conditions of application and any type of objects, metal, plastic, wood or other material.
  • a painting apparatus can present even the benefits due to use of a heated carrier fluid (quick drying, reduction or elimination of synthetic solvents) and to the use of modified air rich in nitrogen as carrier fluid (low dew point, no oxidation of the paint, no impurities - particularly for equipment with local production of nitrogen with osmosis membranes - and a more neutral electrical behaviour than air).
  • a heated carrier fluid quick drying, reduction or elimination of synthetic solvents
  • modified air rich in nitrogen as carrier fluid low dew point, no oxidation of the paint, no impurities - particularly for equipment with local production of nitrogen with osmosis membranes - and a more neutral electrical behaviour than air.
  • plasma it is meant an ionized gas, consisting of a collection of electrons and ions, but which is globally neutral (i.e. the total electrical charge is null).
  • FIG. 1 shows schematically a side view of a ionizing device according to the invention
  • FIG. 2 shows an embodiment of a spray painting device according to the invention, in which the tube is shown in partial longitudinal section with some parts removed for clarity;
  • FIG. 3 shows a preferred embodiment of an isolated joint for a ionising device according to the invention
  • FIG. 4 shows a preferred embodiment of a device according the invention
  • a device comprises a conduit or tube 1 for the passage of a carrier fluid under pressure from a source 4 of the same fluid to an airbrush 3 for the mixing of fluid with the paint contained in a container 5 of known type.
  • the source 4 which is here described and illustrated in brief because it is "per se” of common type, can be a source of compressed air or, preferably, of air modified rich in nitrogen, of the type produced by membrane separation or by a PSA ( Pressure Swing Absorption) or similar procedures.
  • a joint 6 is provided to connect a head 7 of a ionizer 8 to a passage region of the fluid.
  • the joint 6 is isolated statically, and inside the joint there is provided an inlet 9 of pressurized fluid carrier, an inlet 10 of ions emitted by the head 7 in communication with the flow of fluid, and an exit 11 of the flow of fluid carrier ionized .
  • the ionizer 8 can also be fitted with a selector 12, such as a selector with three positions, to select the positive, neutral or negative ions emitted by the head 7 or from any additional heads of the ionizer.
  • a selector 12 such as a selector with three positions, to select the positive, neutral or negative ions emitted by the head 7 or from any additional heads of the ionizer.
  • the joint 6 is connected via a known connection to the ends of a tube 1, which consists for example of a sheath of rubber or neoprene, in which advantageously may be provided a heater element 14, preferably composed by a double wire resistance arranged along the tube and that in the use it is in thermal contact with the fluid to warm it to a desired temperature at the point of mixing with the paint, but which is at the same time statically isolated from fluid in order to eliminate the dispersion or modification of the preset ionization charge.
  • a tube 1 consists for example of a sheath of rubber or neoprene, in which advantageously may be provided a heater element 14, preferably composed by a double wire resistance arranged along the tube and that in the use it is in thermal contact with the fluid to warm it to a desired temperature at the point of mixing with the paint, but which is at the same time statically isolated from fluid in order to eliminate the dispersion or modification of the preset ionization charge.
  • thermocouple PT100 arranged near the end 16 of tube 1 which is intended to be connected to airbrush 3.
  • the sensor 15 connected to a control unit of the heater, advantageously allows to control the temperature of fluid in the vicinity of the outlet form airbrush and thus it allows to control the on/off switch of the heater.
  • the fluid source 4 is connected to the tube 1 provided with the airbrush so that the flow of carrier fluid passes through the ionization region
  • the operator may decide by the selector 12 the sign of the emission of ions, in order to maximize the electrostatic effect in the painting of the object.
  • surfaces and plastic resins normally have a negative surface charge.
  • the head emits positive ions to positively charged the fluid which is so attracted by the negatively charged surface of the object, reducing the phenomenon of overspray.
  • the surfaces having normally a positive charge such as metal surfaces, for which it is useful to select an emission of negative ions.
  • the ionization of the fluid is done in such a way that the flow of fluid is kept isolated and to prevent the electric charge of the flow from discharging to ground.
  • At least a shielded region of ionisation is provided, for example using an isolated joint 6.
  • the device of the invention may also be useful to use the device of the invention to charge negatively the flow of fluid carrier in order to remove dust released into the environment, which have typically a positive charge. In this way, the dust is rejected from the so called “painting cone" and it is prevented from being dragged on the object during the painting.
  • the carrier fluid is in the form of cold plasma obtained preferably by ionization.
  • the device comprises:
  • a spray gun 200 fitted with an inlet 60 of gas, an inlet 70 of paint, and an outlet 80 for the spraying of a mixture of gas and paint on a object to be painted, - at least one conduit or tube 300 extended from the source 100 to gun 200, and
  • At least one ionization device 330 to ionize the carrier gas from the source 100 with a flow of positively charged ions and a flow of negatively charged ions to obtain a carrier in the form of a cold plasma to be mixed with the paint.
  • the ionization device comprises two ioniser 50 connected to respective heads of ionization 40, which are arranged along respective conduits 300 separate from each other to send a stream of ions of opposite sign on two separate flows of carrier gas.
  • the heads 40 are arranged in cylinders 14 through which the of carrier gas flows and communicating with conduits 300.
  • the cylinders 140 are made of glass tube protected by a container made of insulating material, for example arnite (R).
  • the source 100 comprises a source of compressed air 150 communicating via a solenoid valve 160 and filters 200 with a separation membrane 170 for the production from air of nitrogen or argon to be used as carrier fluid.
  • the membrane 170 is also communicating through a check valve 190 with a reservoir 180 which is to its turn in communication with the cylinders 140 through separate pipes 260, 270.
  • conduits 300 extend, being preferably made of flexible hoses of plastic material or Teflon, fitted with internals heating elements 110, such as heating wires, which are designed to heat the flow of carrier gas passing through conduits 300.
  • Conduits 300 are preferably coupled side to side and lined throughout their length by a rubber sheath 230 and are connected by insulating washers 240 on a frame 280 of containment of the source 100 and of the ionization device 330.
  • conduits 300 and wires 110 are preferably statically isolated from the outlet of the gas from cylinders 140 and converge at a point 130 in which the flow charged positively and the flow charged negatively from their respective ionizers meet, generating a flow of gas in the form of plasma, in other words, of a highly ionized gas having a neutral overall charge.
  • each heated tube 300 is equipped with a temperature sensor, for example, a thermocouple 111 located near the inlet 60 of gun 200, and a safety insulating block 120 placed between wire 110 and gun 200.
  • a temperature sensor for example, a thermocouple 111 located near the inlet 60 of gun 200, and a safety insulating block 120 placed between wire 110 and gun 200.
  • block 120 allows to have the device certified and approved according to ATEX regulations in force in relation to risk of explosion.
  • the temperature of the gas at the gun outlet can be adjusted to optimize the mixing and, at the same time, it is obtained to put both the operator and the work environment under safe conditions from the point of view of possible electrical risk and of risks due to the presence of flammable substances.
  • the converging point 130 is made by a "Y" junction 90, arranged upstream the inlet 60 to the spray gun.
  • a point of confluence 130 can be provided downstream of the inlet of the fluid in the gun 200, with conduits 300 ending within the same gun
  • conduits 300 inside the gun 200 will be properly insulated from the metal body of the gun.
  • the flow of pressurized gas plasma is mixed with a flow of paint 210 and sprayed on the objects to be treated.
  • a sensor 220 of electrical charge that can detect a signal 250 related to the type and intensity of electric polarity of the object to be painted.
  • This detected signal 250 can be used to adjust the ionisers 50 to determine the intensity and polarity of ions to be sent into the flow of carrier gas in order to have a completely neutral carrier fluid.
  • the source 100 is fed by compressed air and the membrane begins to produce a stream of nitrogen or argon (both ionizing gas) that is accumulated in the pressurized reservoir 180. From the reservoir, the ionizing gas is injected into the cylinders 140 and is invested by the flow of ions emitted by heads 40, having opposite sign in the two conduits 300.
  • sensors 251 can be provided to read the main parameters of the carrier fluid, such as gas composition, temperature and pressure.
  • Conduits 300 are electrostatically isolated, so the two separate streams of ionized gas retain their charge sign until the confluence point 130.
  • the two streams flow together by generating a plasma consisting of an strongly ionized gas having an overall neutral charge and forming a spray cone 230 to reach the object to be painted, with the advantages detailed above.
  • the invention obtains the important advantages described above.
  • a further advantage is that the formation of paint drops is eliminated thanks to the acceleration of the blocking time of the paint (time needed for the adhesion of the paint to the object ).
  • the plasma can be also used to clean objects before painting.
  • plasma also gives an effect of increased brightness of the layer of paint, since the same plasma is neutral in terms of chemical composition and neutral with regard to electric charges.

Landscapes

  • Nozzles (AREA)

Abstract

L'invention concerne un dispositif de peinture par pulvérisation qui comprend un conduit (1) pour le passage d'un fluide porteur sous pression (2) et un aérographe (3) relié au conduit (1) pour le mélange du fluide porteur (2). Ledit dispositif de peinture par pulvérisation fait intervenir un dispositif d'ionisation du fluide porteur (2) et un blindage électrostatique d'au moins une partie de la voie de passage du fluide.
PCT/IB2008/002901 2007-10-31 2008-10-29 Dispositif de peinture par pulvérisation à ionisation du fluide porteur Ceased WO2009056950A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITBO2007A000732 2007-10-31
ITBO20070732 ITBO20070732A1 (it) 2007-10-31 2007-10-31 Dispositivo per verniciatura a spruzzo con ionizzazione del fluido vettore.
ITBO20070813 ITBO20070813A1 (it) 2007-12-12 2007-12-12 Dispositivo e metodo di verniciatura a spruzzo con un fluido vettore allo stato di plasma freddo.
ITBO2007A000813 2007-12-12

Publications (1)

Publication Number Publication Date
WO2009056950A1 true WO2009056950A1 (fr) 2009-05-07

Family

ID=40475016

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/002901 Ceased WO2009056950A1 (fr) 2007-10-31 2008-10-29 Dispositif de peinture par pulvérisation à ionisation du fluide porteur

Country Status (1)

Country Link
WO (1) WO2009056950A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2486984A2 (fr) * 2011-02-11 2012-08-15 Thomas Mayer Procédé de traitement de l'air comprimé ainsi que dispositif de traitement de l'air comprimé
ITVI20120271A1 (it) * 2012-10-16 2014-04-17 Claudio Bettanin Impianto per la verniciatura a spruzzo
WO2014095081A3 (fr) * 2012-12-20 2014-08-14 Thomas Mayer Système de préparation de gaz comprimé pour des installations de revêtement à gaz comprimé et installations de revêtement à gaz comprimé
ITFI20130133A1 (it) * 2013-06-03 2014-12-04 Eurosider Sas Di Milli Ottavio & C Apparato per la verniciatura pneumatica
ITFI20130132A1 (it) * 2013-06-03 2014-12-04 Eurosider Sas Di Milli Ottavio & C Metodo e apparato per la verniciatura elettrostatica mediante fluido vettore arricchito in ossigeno
ITFI20130286A1 (it) * 2013-11-25 2015-05-26 Eurosider Sas Di Milli Ottavio & C Apparato automatico di verniciatura pneumatica.
US20160221009A1 (en) * 2012-10-10 2016-08-04 Eurosider S.A.S. Di Milli Ottavio & C. Method and apparatus for electrostatic painting

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1188682A (en) * 1966-04-28 1970-04-22 Ransburg Electro Coating Corp Improvements in and relating to Spray Coating Apparatus
WO1999055466A1 (fr) * 1998-04-27 1999-11-04 Msp Corporation Procede et appareil pour le depot de couches minces sur des substrats a grande surface
JP2000042452A (ja) * 1998-07-28 2000-02-15 Erunikku:Kk 自動車の塗装装置および塗装用補助具
US20060283387A1 (en) * 2005-06-17 2006-12-21 Kouichi Takeda Painter and method of painting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1188682A (en) * 1966-04-28 1970-04-22 Ransburg Electro Coating Corp Improvements in and relating to Spray Coating Apparatus
WO1999055466A1 (fr) * 1998-04-27 1999-11-04 Msp Corporation Procede et appareil pour le depot de couches minces sur des substrats a grande surface
JP2000042452A (ja) * 1998-07-28 2000-02-15 Erunikku:Kk 自動車の塗装装置および塗装用補助具
US20060283387A1 (en) * 2005-06-17 2006-12-21 Kouichi Takeda Painter and method of painting

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2486984A2 (fr) * 2011-02-11 2012-08-15 Thomas Mayer Procédé de traitement de l'air comprimé ainsi que dispositif de traitement de l'air comprimé
US20160221009A1 (en) * 2012-10-10 2016-08-04 Eurosider S.A.S. Di Milli Ottavio & C. Method and apparatus for electrostatic painting
ITVI20120271A1 (it) * 2012-10-16 2014-04-17 Claudio Bettanin Impianto per la verniciatura a spruzzo
US20150352567A1 (en) * 2012-12-20 2015-12-10 Thomas Mayer Compressed gas preparation system and compressed-gas operated coating installation
WO2014095081A3 (fr) * 2012-12-20 2014-08-14 Thomas Mayer Système de préparation de gaz comprimé pour des installations de revêtement à gaz comprimé et installations de revêtement à gaz comprimé
CN105228727B (zh) * 2012-12-20 2018-11-13 托马斯·迈尔 压缩气体准备系统以及压缩气体运行的涂层机组
CN105228727A (zh) * 2012-12-20 2016-01-06 托马斯·迈尔 压缩气体准备系统以及压缩气体运行的涂层机组
ITFI20130132A1 (it) * 2013-06-03 2014-12-04 Eurosider Sas Di Milli Ottavio & C Metodo e apparato per la verniciatura elettrostatica mediante fluido vettore arricchito in ossigeno
WO2014195983A1 (fr) 2013-06-03 2014-12-11 Eurosider S.A.S. Di Milli Ottavio & C. Procédé et appareil de peinture électrostatique utilisant un fluide porteur enrichi en oxygène
WO2014195779A1 (fr) * 2013-06-03 2014-12-11 Eurosider S.A.S. Di Milli Ottavio & C. Appareil de peinture par pulvérisation d'air
US10092915B2 (en) 2013-06-03 2018-10-09 Eurosider S.A.S. Di Milli Ottavio & C. Air spray painting apparatus
ITFI20130133A1 (it) * 2013-06-03 2014-12-04 Eurosider Sas Di Milli Ottavio & C Apparato per la verniciatura pneumatica
WO2015075530A1 (fr) * 2013-11-25 2015-05-28 Eurosider S.A.S. Appareil automatique pour la peinture par pulverisation pneumatique
ITFI20130286A1 (it) * 2013-11-25 2015-05-26 Eurosider Sas Di Milli Ottavio & C Apparato automatico di verniciatura pneumatica.
CN105745025A (zh) * 2013-11-25 2016-07-06 米利欧塔维奥及C欧罗赛徳联合股份有限公司 用于气动涂漆的自动设备
JP2016538991A (ja) * 2013-11-25 2016-12-15 ユーロサイダー エス．エイ．エス． ディ ミッリ オッタヴィオ アンド シー． 空気ペイント用の自動装置

Similar Documents

Publication Publication Date Title
WO2009056950A1 (fr) Dispositif de peinture par pulvérisation à ionisation du fluide porteur
RU2623779C2 (ru) Способ и установка для электростатической окраски
US2710773A (en) Electrostatic spray coating apparatus
US3735925A (en) Method and device for electrostatic spraying of material
US8269807B2 (en) Apparatus for electrostatic coating
RU2644903C2 (ru) Распылительный наконечник в сборе для электростатического распылительного пистолета
KR19990035946A (ko) 연마 및 전도성 액체용 정전 노즐
US7240861B2 (en) Method and apparatus for dispensing paint powders for powder coatings
ITFI20130133A1 (it) Apparato per la verniciatura pneumatica
US3382091A (en) Electrostatic coating methods and apparatus for conductive coating materials
US3051394A (en) Electrostatic spray coating apparatus and method
US20150231652A1 (en) Grounding rods for electrostatic spray
JPH0224587B2 (fr)
US3793049A (en) Electrostatic coating method
WO2013028084A1 (fr) Procédé de pulvérisation et tête de pulvérisation comprenant une buse de laval et une électrode d'induction annulaire
ITBO20070813A1 (it) Dispositivo e metodo di verniciatura a spruzzo con un fluido vettore allo stato di plasma freddo.
PL72576B1 (en) Method of electrostatically spray coating articles with a liquid coating material[gb1224911a]
EP3517214A1 (fr) Dispositif de traitement de surface de vaporisation
KR101901270B1 (ko) 정전식 스프레이 장치
SU1100006A1 (ru) Устройство дл электростатического нанесени покрытий
US20090238987A1 (en) Apparatus for applying electrostatic powders on manufactured articles in general
JP2007237089A (ja) 粉体静電塗装用スプレーガン
JPH0884942A (ja) 静電塗装用スプレーガン
Ting Back ionisation in electrostatically depostied powder layers
ITBO20070732A1 (it) Dispositivo per verniciatura a spruzzo con ionizzazione del fluido vettore.

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08845100

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2008845100

Country of ref document: EP

122 Ep: pct application non-entry in european phase

Ref document number: 08845100

Country of ref document: EP

Kind code of ref document: A1