EP0092365A2 - Appareil de revêtement par pulvérisation et méthode - Google Patents

Appareil de revêtement par pulvérisation et méthode Download PDF

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Publication number
EP0092365A2
EP0092365A2 EP83302048A EP83302048A EP0092365A2 EP 0092365 A2 EP0092365 A2 EP 0092365A2 EP 83302048 A EP83302048 A EP 83302048A EP 83302048 A EP83302048 A EP 83302048A EP 0092365 A2 EP0092365 A2 EP 0092365A2
Authority
EP
European Patent Office
Prior art keywords
liquid
fan
flow rate
atomizing
article
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83302048A
Other languages
German (de)
English (en)
Other versions
EP0092365A3 (fr
Inventor
Robert Milovich
Edward C. Mcghee
Donald R. Hastings
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.)
Nordson Corp
Original Assignee
Nordson Corp
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 Nordson Corp filed Critical Nordson Corp
Publication of EP0092365A2 publication Critical patent/EP0092365A2/fr
Publication of EP0092365A3 publication Critical patent/EP0092365A3/fr
Withdrawn legal-status Critical Current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
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
    • B05B12/124—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to distance between spray apparatus and target
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
    • B05B12/126—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to target velocity, e.g. to relative velocity between spray apparatus and target
    • 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
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • B05B7/067—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet the liquid outlet being annular

Definitions

  • This invention relates to spray coating systems and more particularly to electrostatic spray coating systems of the type utilizing air to both atomize the electrostatically charged liquid coating material and shape the fan spray pattern thereof.
  • the nozzle of the gun is also provided with a circular array of atomizing air orifices located concentric with the liquid coating orifice, which impinge the liquid stream issuing from the liquid orifice with air for the purpose of atomizing it. Also located in the nozzle but mounted slightly downstream of the concentrically arranged atomizing air and liquid orifices are two fan spray pattern shaping orifices, which impinge the electrostatically charged and atomized coating particle stream from opposite sides thereof with separate air streams for shaping the circular fan spray pattern into a noncircular shape.
  • the atomizing and fan-shaping air streams have been connected to a source of pressurized air through a common air hose in which a single, manually-controlled valve was provided for controlling the air flow rate.
  • a single, manually-controlled valve was provided for controlling the air flow rate.
  • Control of the coating flow rate in such known systems was provided with a manually-operated valve interconnected between the gun and a pressurized source of paint.
  • Adjustable control of the level of electrostatic charging voltage applied to the electrode in the gun nozzle was provided by suitable manually-operated dial means or the like incorporated in the high voltage electrostatic power supply.
  • the air flow to the fan-shaping orifices was such that instead of converting the circular coating pattern issuing from the coating orifice to an oval pattern, it bisected the oval pattern into two spaced, roughly circular patterns with no coating in the middle region between them. If the air flow was reduced sufficiently with the single valve to avoid bisecting the oval pattern into two separate, roughly circular patterns, the air flow to the atomizing orifice array was insufficient to properly atomize the coating.
  • an electrostatic spray gun which utilizes air to both atomize the coating material and shape the fan pattern which can be used to satisfactorily spray low solids content coatings at low flow rates.
  • This objective has been accomplished in accordance with certain principles of this invention by providing separate and independently controlled flow valves between the pressurized air supply and the respective atomizing orifice array and fan-shaping orifice array. In this way the atomizing air and the fan-shaping air can be separately and independently controlled to insure air flow rates to the atomizing and fan-shaping orifices adequate to fully atomize, as well as properly shape, the fan pattern.
  • the atomizing and fan-shaping flow control valves, the coating material flow control valve, and the high voltage electrostatic supply are signal-controlled from an electronic controller provided with a look-up table memory which correlates for different articles to be coated the requisite combination of charging voltage, coating flow rate, atomization air flow rate, and fan-shaping air flow rate necessary to properly coat each such different article.
  • the look-up table memory is accessed and the specific combination of charging voltage, coating flow rate, atomization air flow rate, and fan-shaping air flow rate is retrieved.
  • the unique combination of retrieved control parameters for the specific article being coated are applied via a suitable controller output interface, to the high voltage supply, coating valve, atomization air valve, and fan-shaping air valve to achieve the requisite charging voltage, coating flow, and atomization and fan-shaping air flow rates necessary to optimally coat the specific article being sprayed.
  • FIG. 1 is a schematic diagram of an electrostatic spray coating system having separate control means for the charging voltage, coating material, atomization air, and fan-shaping air, which are separately controlled from an electronic controller which, in response to entry of the identity of an article to be coated, independently sets the charging voltage, coating flow, and atomizing and fan-shaping air flows to the optimum values.
  • the preferred embodiment is seen to include an electrostatic spray gun 10 having a barrel 12 which terminates at its forward end in a nozzle from which electrostatically charged coating particles are emitted in a predetermined pattern toward an article to be coated 16.
  • the article 16 which may be stationary or continuously transported past the spray gun by a conveyor hook or the like 18, is spaced from the spray gun nozzle some predetermined distance which varies depending upon the installation.
  • the spray gun 10 may be provided with a handle 20 if the gun is designed to be manually manipulated by an operator during the spray coating operation in which event the gun is provided with a finger-operated movable trigger 22 for controlling the ON/OFF condition of the spray gun.
  • the handle and trigger may be omitted and the barrel 12 fastened to a suitable support, movable or stationary, in which event an ON/OFF device for the gun is provided which is under appropriate solenoid control from a program controller or the like.
  • the nozzle of the gun is provided with a central liquid coating orifice 24 supplied via a suitable passage 24'. Assuming the orifice 24 is circular, liquid coating material when issued from the orifice 24 will be in a generally circular pattern. Axially extending from the liquid coating orifice 24 is an electrostatic coating-charging electrode 26 supplied from a suitable high voltage cable 28. Surrounding the liquid coating orifice 24 is a concentric circular array of atomization air orifices 30 which are supplied from an atomization air passage 30'. The atomization air orifices 30 impinge with air the liquid coating stream eminating from the orifice 24 for the purpose of atomizing it.
  • a pair of fan-shaping orifices 32a and 32b which are supplied from a passage 32'.
  • the fan-shaping orifices 32a and 32b subject the generally circular pattern of electrostatically charged atomized particles in the region 36 to opposed fan-shaping air jets to transform the generally circular atomized coating pattern to an oval pattern.
  • a pressurized source of liquid coating material 40 is provided which is connected to the passage 24' via a hose 42 in which a signal-controlled liquid flow control valve 44 is connected capable of operating at flow rates of 40-120cc/minute.
  • the valve 44 may be of any suitable type, such as is commercially available from Fairchild Industrial Products Division, 1501 Fairchild Drive, Winston-Salem, North Carolina 27105, designated Models T-5400 or T-5100, coupled with a fluid regulator commercially available from Nordson Corporation, designated Model 246924 or 246794.
  • a source of pressurized air 46 is provided to supply pressurized air at independently and separately controlled flow rates to passages 30' and 32'.
  • valves 52 and 54 Interconnecting the pressurized air source 46 and air passages 30' and 32' are air lines 48 and 50 in which are respectively connected separate signal- controlled air flow valves 52 and 54, respectively.
  • the valves 52 and 54 may be of any suitable type, such as commercially available from Fairchild Industrial Products Division, 1501 Fairchild Drive, Winston-Salem, North Carolina 27105, designated Models T-5400 or T-5100, which are capable of controlling air flow in the range of 1.25-2.0 cfm and 4.0-5.0 cfm for atomization and fan-shaping, respectively.
  • valves 44, 52, and 54 which have input control terminals 44', 52', and 54', respectively, are characterized such that as the input signal thereto varies the flow rate therethrough varies.
  • the valves may be responsive to digital control signals or analog control signals, as desired.
  • the particle-charging electrode 24 is supplied via the high voltage cable 28 from a variable high voltage source 60.
  • the output voltage of the source 60 is variable in response to a control signal input thereto at control terminal 60', preferably over the approximate range of 160Kv-115 Kv.
  • an electronic controller 62 To provide the desired combination of control signals to the input terminals 44', 52', and 54' of the valves 44, 52, and 54 and to the input terminal 60' of the high voltage source 60, an electronic controller 62 is provided.
  • Electronic controller 62 which preferably is microprocessor based, includes an article identification entry device 64, such as an alphanumeric keyboard, and a look-up table memory 66, as well as the necessary arithmetic unit, input interface 67, output interface 68, and the like typically found in a microcomputer.
  • article identification entry device 64 such as an alphanumeric keyboard
  • a look-up table memory 66 as well as the necessary arithmetic unit, input interface 67, output interface 68, and the like typically found in a microcomputer.
  • the particular charging voltage and coating and atomization and fan-shaping flow rates for various articles is subject to considerable variation depending upon shape of the article, composition of the coating material, distance between the article and the gun nozzle, line speed. of the conveyor on which the article is moving past the spray gun, temperature of the coating material, percentage solids of the coating material, humidity, and the like.
  • the identity of the article is entered into the controller 62 along with the specific charging voltage, and coating and air flow rates.
  • the charging voltage, coating flow rate, and atomization and fan-shaping air flow rates for each particular article are stored in the controller memory in a "look-up" table configuration, such that upon entry into the keyboard 64 of the identification of the article to be coated, the look-up table memory is accessed and the charging voltage, coating flow rate, and atomization and fan-shaping air flow rates for that particular article are retrieved and output from the microcomputer via output innerface 68 to the input terminals 60', 44', 52', and 54' of the high voltage source 60, the paint control valve 44, the atomization air control valve 52, and the fan-shaping air control valve 54, respectively, for adjusting the charging voltage, coating flow rate, atomization air flow rate, and fan-shaping air flow rate, respectively, necessary to optimally coat the particular article.
  • an article identification unit 70 can be located along the article conveyor line upstream of the spray gun 10. As articles move past the article identification unit the identity of the articles is automatically determined, using conventional article-identification techniques, and the article identification entered directly into the part identification entry unit 64 of the controller 62 via an input interface 67. In response to entry of the identification of the article, the look-up table memory is accessed and suitable control signals output to the high voltage source 60 and valves 44, 52, and 54. When the article whose identity has been previously sensed reaches the spray gun, the charging voltage and coating flow and air flow rates are automatically set for optimal coating of the particular article whose identity was previously sensed by sensor 70.
  • An Important advantage of this invention attributable to separate and independent control of the atomizing air and fan-shaping air flow rates is that when coating at low flow rates with low solids content coating material sufficiently high atomizing air flow rates can be utilized to assure proper atomization of the coating material without bisecting the oval fan pattern which heretofore resulted when the atomization and fan-shaping flow rates were jointly controlled with a single air flow valve.
  • a further and equally important advantage of this invention, attributable to the use of a controller having a look-up table memory to provide the unique combination of control signals for the high voltage source and the coating and air flow control valves is that the charging voltage and the coating and air flow rates can be automatically adjusted for optimum coating results for a large assortment of different articles.
  • the invention is also useful in non-electrostatic coating systems.
  • An illustrative application where the invention can be used without electrostatically charging the coating particles is when coating interior corners of an enclosure. In such applications the electrostatic supply is not used.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
EP83302048A 1982-04-13 1983-04-12 Appareil de revêtement par pulvérisation et méthode Withdrawn EP0092365A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US36785582A 1982-04-13 1982-04-13
US367855 1982-04-13

Publications (2)

Publication Number Publication Date
EP0092365A2 true EP0092365A2 (fr) 1983-10-26
EP0092365A3 EP0092365A3 (fr) 1984-05-23

Family

ID=23448919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83302048A Withdrawn EP0092365A3 (fr) 1982-04-13 1983-04-12 Appareil de revêtement par pulvérisation et méthode

Country Status (4)

Country Link
EP (1) EP0092365A3 (fr)
JP (1) JPS58183958A (fr)
AU (1) AU1342883A (fr)
ES (1) ES8403744A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0114064A2 (fr) * 1983-01-18 1984-07-25 Nordson Corporation Buse de pulvérisation pour pistolet électrostatique
AU688767B2 (en) * 1993-07-19 1998-03-19 Cryovac, Inc. Jet spray applicator for viscous liquids including adhesive/cohesive solutions
EP1153664A3 (fr) * 1995-11-27 2003-06-04 KLASCHKA GMBH & CO. Dispositif de projection de liquides sur des pièces
US7740225B1 (en) 2000-10-31 2010-06-22 Nordson Corporation Self adjusting solenoid driver and method
CN110170409A (zh) * 2019-05-10 2019-08-27 闽江学院 一种多功能喷漆设备

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4891249A (en) * 1987-05-26 1990-01-02 Acumeter Laboratories, Inc. Method of and apparatus for somewhat-to-highly viscous fluid spraying for fiber or filament generation, controlled droplet generation, and combinations of fiber and droplet generation, intermittent and continuous, and for air-controlling spray deposition
JP3473718B2 (ja) * 1994-07-22 2003-12-08 日産自動車株式会社 回転霧化静電塗装方法および装置
CN105032655A (zh) * 2015-07-09 2015-11-11 山东宏桥新型材料有限公司 铝电解阳极钢爪喷涂石墨系统及利用其进行喷涂方法
KR102026891B1 (ko) * 2017-02-06 2019-09-30 에이피시스템 주식회사 도포 장치

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH609586A5 (fr) * 1974-09-16 1979-03-15 Champion Spark Plug Co
DE2217865B2 (de) * 1971-05-28 1981-07-16 Champion Spark Plug Co., Toledo, Ohio Elektrostatische Spruehpistole zum Auftragen von partikelfoermigem Material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2217865B2 (de) * 1971-05-28 1981-07-16 Champion Spark Plug Co., Toledo, Ohio Elektrostatische Spruehpistole zum Auftragen von partikelfoermigem Material
CH609586A5 (fr) * 1974-09-16 1979-03-15 Champion Spark Plug Co

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0114064A2 (fr) * 1983-01-18 1984-07-25 Nordson Corporation Buse de pulvérisation pour pistolet électrostatique
EP0114064A3 (en) * 1983-01-18 1985-08-28 Nordson Corporation Nozzle assembly for electrostatic spray guns
AU688767B2 (en) * 1993-07-19 1998-03-19 Cryovac, Inc. Jet spray applicator for viscous liquids including adhesive/cohesive solutions
EP1153664A3 (fr) * 1995-11-27 2003-06-04 KLASCHKA GMBH & CO. Dispositif de projection de liquides sur des pièces
US7740225B1 (en) 2000-10-31 2010-06-22 Nordson Corporation Self adjusting solenoid driver and method
CN110170409A (zh) * 2019-05-10 2019-08-27 闽江学院 一种多功能喷漆设备

Also Published As

Publication number Publication date
EP0092365A3 (fr) 1984-05-23
JPS58183958A (ja) 1983-10-27
ES521421A0 (es) 1984-04-01
AU1342883A (en) 1983-10-20
ES8403744A1 (es) 1984-04-01

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Inventor name: MILOVICH, ROBERT

Inventor name: MCGHEE, EDWARD C.

Inventor name: HASTINGS, DONALD R.