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WO1994008725A1 - Procede et appareil pour poudre electrostatique de revetement - Google Patents

Procede et appareil pour poudre electrostatique de revetement Download PDF

Info

Publication number
WO1994008725A1
WO1994008725A1 PCT/JP1993/001449 JP9301449W WO9408725A1 WO 1994008725 A1 WO1994008725 A1 WO 1994008725A1 JP 9301449 W JP9301449 W JP 9301449W WO 9408725 A1 WO9408725 A1 WO 9408725A1
Authority
WO
WIPO (PCT)
Prior art keywords
gun
powder coating
electrostatic powder
coated
electrostatic
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/JP1993/001449
Other languages
English (en)
Japanese (ja)
Inventor
Yasunari Okamoto
Masahiro Yamamoto
Mitsuyoshi Kumata
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.)
Taiheiyo Cement Corp
Original Assignee
Onoda Cement Co Ltd
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 Onoda Cement Co Ltd filed Critical Onoda Cement Co Ltd
Priority to DE4395193T priority Critical patent/DE4395193T1/de
Priority to GB9407859A priority patent/GB2276340B/en
Publication of WO1994008725A1 publication Critical patent/WO1994008725A1/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
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/90—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth
    • B05B16/95—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth the objects or other work to be sprayed lying on, or being held above the conveying means, i.e. not hanging from the conveying means
    • 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
    • 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
    • B05B5/087—Arrangements of electrodes, e.g. of charging, shielding, collecting electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
    • B05D3/141—Plasma treatment
    • B05D3/142—Pretreatment
    • 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
    • B05B5/082—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects
    • B05B5/084—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects the objects lying on, or being supported above conveying means, e.g. conveyor belts

Definitions

  • the present invention relates to an electrostatic powder coating method and an apparatus for use in recoating automobiles, electric washing machines, electric refrigerators, switchboards, pipes, and the like.
  • gun electrostatic powder coating gun
  • the surface to be coated is an insulating layer. If the gun is used at a normal voltage, the potential on the surface to be painted will increase and reverse ionization will occur, creating a crater.
  • the voltage of the gun is reduced to, for example, 40 to 60 KV when recoating, or the discharge amount of the powder paint is increased.
  • the adjustment is troublesome and the film thickness that can be recoated is limited. For example, it is best to overlay a 40-m thick film on a 60-m-th surface to be coated. Above this, reverse ionization occurs.
  • the voltage and the discharge amount of the paint must be adjusted according to the presence or absence of the baking coating film on the object. Since a dedicated operator is required, automation is difficult.
  • Conveying means for carrying an uncoated object and a baking-coated object; An electrostatic powder coating gun opposed to the transfer means; and a corona discharge means to which a voltage having a polarity opposite to that of the gun is applied and facing the transfer means upstream of the gun.
  • a voltage having a polarity opposite to that of the gun is applied to the corona discharge electrode of the discharge means. It becomes a potential of the opposite polarity.
  • the object to be coated is carried to the front of the gun in this state, and the electrostatic powder coating charged by the gun is electrostatically applied to the surface to be baked.
  • FIG. 1 is a front view showing a first embodiment of the present invention
  • FIG. 2 is an enlarged view of the repainted article of FIG. 1
  • FIG. 3 is an enlarged view of the cloth painted article of FIG.
  • FIG. 4 is a perspective view showing a second embodiment of the present invention
  • FIG. 5 is a perspective view showing a third embodiment of the present invention.
  • the electrostatic powder coating device 1 is composed of an electrostatic powder coating gun 2, a corona discharge device 3, and a conductive belt conveyor 4.
  • An electrostatic powder coating gun (hereinafter simply referred to as a gun) 2 is provided downward at the center of the cover 5, and the gun 2 can perform reciprocating motion by means of a reciprocating lamp 7.
  • the corona discharge device 3 is provided upstream of the gun 2 and includes a high voltage generator 10 and a corona pin (corona discharge electrode) 11.
  • the corona pin 11 can perform reciprocating exercise by reciprocating overnight 12.
  • the conductive belt conveyor 4 transports the objects 20 and 30 to be coated, and is grounded via the rotating device 21.
  • the object to be coated 20 is an unpainted iron plate 20a, a so-called painted material
  • the object to be coated 30 is an iron plate 20a having a baking coating layer 30a, a so-called repainted object. is there.
  • a predetermined voltage for example, a negative voltage of 80 KV is applied to the gun 2 and a voltage having a polarity opposite to that of the gun 2, that is, a positive voltage is applied to the corona pin 11 of the corona discharge device 3. Then, the conductive belt conveyor 4 is driven, and the objects 20 and 30 placed at intervals are conveyed in the direction of arrow A4.
  • the baking coating layer 30a becomes a positive potential by corona discharge, and its surface potential rises.
  • the surface potential at this time is appropriately selected, but is preferably in the range of 200 V to 3 KV. This surface potential can be controlled by changing the applied voltage, the discharge distance, and the discharge time.
  • the object 30 is carried below the gun 2, and the powder coating 40 charged on the negative electrode is electrostatically applied to form a coating film 50.
  • the positive surface potential, ie, + ion, and the applied voltage of the gun 2, ie,-ion, are offset and neutralized, so that the painted surface has a high potential enough to cause reverse ionization. Will not be. Therefore, the coating film 50 has no clay and the coating film 50 is tight and stable. Therefore, the finish of the paint film is good and the paint film can be prevented from dropping during transfer.
  • the voltage of the electrostatic powder coating gun 2 does not need to be lowered, so that the coating efficiency does not decrease.
  • the gun 2 and the corona discharge device 3 were operated under the same conditions. However, if the object to be coated is a cloth-coated object 20, a corona discharge is performed by the corona discharge device 3. Since the cloth-coated object 20 is grounded, + corona ion (positive charge) Will flow.
  • the object to be coated 20 is subjected to electrostatic coating in the same state as when directly applied by a gun without passing through a corona discharge device.
  • the electrostatic coating can be performed under the same conditions regardless of whether the baked coating films of the objects 20 and 30 are coated, the automation of the coating operation is facilitated.
  • the electrostatic powder coating device 70 is composed of an electrostatic powder coating gun 2, a corona discharge device 3, and an overhead conveyor 61.
  • the corona discharge device 3 is provided upstream of the gun 2 and includes a high voltage generator 10 and a corona pin (corona discharge electrode) 11.
  • the gun 2 and the corona pin 11 can reciprocate up and down by reciprocal motion 7.
  • the over-head conveyor 61 transports the object 60 to be coated, and is grounded.
  • a predetermined voltage for example, a negative voltage of 80 KV is applied to the gun 2 and a voltage having a polarity opposite to that of the gun 2, that is, a positive voltage is applied to the corona pin 11 of the corona discharge device 3. Then, the overhead conveyor 61 is driven, and the object 60 suspended on the hanger is transported in the direction of arrow A4 at intervals.
  • the surface of the object becomes a positive potential due to corona discharge, and the surface potential rises.
  • the surface potential at this time is appropriately selected, but is preferably in the range of 200 V to 3 KV. This surface potential can be controlled by changing the applied voltage, the discharge distance, and the discharge time.
  • the object 60 to be coated is carried forward of the gun 2, and the negatively charged powder coating material 40 is electrostatically applied to form a coating film 50.
  • the positive surface potential, ie, + ion, and the applied voltage of the gun 2, ie, one ion, are canceled and neutralized, so that the painted surface has a high electric potential such that reverse ionization occurs. No place. Therefore, the coating film 50 has no clay and the coating film 50 is tight and stable. Therefore, the finish of the paint film is good and the paint film can be prevented from dropping during transfer.
  • the voltage of the electrostatic powder coating gun 2 does not need to be lowered, so that the coating efficiency does not decrease.
  • UF is a powder paint supply device that supplies powder paint to the gun 2.
  • a third embodiment of the present invention will be described with reference to FIG. 5.A difference between this embodiment and the first embodiment is that a plurality of corona pins 11 of a corona discharge device 104 are provided. Further, all the objects to be coated are the repainted objects 30. A plurality of the corona pins 11 are arranged at intervals L, for example, 15 O mm in a direction orthogonal to the longitudinal direction of the conductive belt conveyor 4. In this embodiment, ions of the opposite polarity to the electrostatic powder coating gun 2 adhere to the entire surface of the repainted object 30, so that the surface potential of the object to be coated becomes uniform. Therefore, the film thickness distribution of the object to be coated is improved.
  • the embodiment of the present invention is not limited to the above.
  • powder coating is performed.
  • the object to be coated is transported by a conveyor that penetrates the inside of the cover.
  • the powder may be collected with a hopper provided on the bottom of the cover.
  • the electrostatic powder coating method and apparatus according to the present invention can be widely used for recoating automobiles, electric washing machines, electric refrigerators, switchboards, pipes, and the like.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Abstract

Du côté amont d'un pistolet de revêtement (2) à poudre électrostatique se trouvent des moyens (3) et (104) de décharge à effet couronne destinés à appliquer une tension de polarité opposée à celle du pistolet (2). Avant que les surfaces finies par cuisson des objets (20) et (30) ne soient revêtues d'une poudre chargée, les ions sont neutralisés par les potentiels électriques de polarité opposée de la poudre chargée que présentent les surfaces finies par cuisson, empêchant ainsi les décharges inverses.
PCT/JP1993/001449 1992-10-08 1993-10-07 Procede et appareil pour poudre electrostatique de revetement Ceased WO1994008725A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE4395193T DE4395193T1 (de) 1992-10-08 1993-10-07 Vorrichtung und Verfahren zur elektrostatischen Pulverauftragung
GB9407859A GB2276340B (en) 1992-10-08 1993-10-07 Apparatus for electrostatic powder coating

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4/270494 1992-10-08
JP27049492A JP3362230B2 (ja) 1992-10-08 1992-10-08 静電粉体塗装装置

Publications (1)

Publication Number Publication Date
WO1994008725A1 true WO1994008725A1 (fr) 1994-04-28

Family

ID=17487060

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1993/001449 Ceased WO1994008725A1 (fr) 1992-10-08 1993-10-07 Procede et appareil pour poudre electrostatique de revetement

Country Status (4)

Country Link
JP (1) JP3362230B2 (fr)
DE (1) DE4395193T1 (fr)
GB (1) GB2276340B (fr)
WO (1) WO1994008725A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2872068B1 (fr) * 2004-06-28 2006-10-27 Centre Nat Rech Scient Cnrse Procede et dispositif pour le depot de couches minces par pulverisation electrohydrodynamique, notamment en post-decharge
JP5838697B2 (ja) * 2011-09-29 2016-01-06 ダイキン工業株式会社 静電噴霧成膜装置
JP2017057358A (ja) * 2015-09-18 2017-03-23 富士ゼロックス株式会社 熱硬化性粉体塗料及び塗装方法
ITUA20164378A1 (it) * 2016-06-15 2017-12-15 Gienne Plast S R L Apparato e metodo
IT201800004997A1 (it) * 2018-05-02 2019-11-02 Impianto e metodo per effettuare rivestimenti di nanomateriali su superfici di oggetti, in particolare impianti di illuminazione
CN115386842A (zh) * 2022-09-20 2022-11-25 湖南千山制药机械股份有限公司 塑料安瓿真空外镀模组及一体成型机

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS551107B2 (fr) * 1975-11-01 1980-01-11
JPS6430674A (en) * 1987-07-01 1989-02-01 Herberts Gmbh Method of electrostatic-coating or spray-coating product with electric-insulating surface and device used for said method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS551107A (en) * 1978-06-16 1980-01-07 Nippon Telegr & Teleph Corp <Ntt> Exposure device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS551107B2 (fr) * 1975-11-01 1980-01-11
JPS6430674A (en) * 1987-07-01 1989-02-01 Herberts Gmbh Method of electrostatic-coating or spray-coating product with electric-insulating surface and device used for said method

Also Published As

Publication number Publication date
JP3362230B2 (ja) 2003-01-07
DE4395193T1 (de) 1994-11-10
GB2276340A (en) 1994-09-28
GB2276340B (en) 1996-05-15
JPH06114297A (ja) 1994-04-26
GB9407859D0 (en) 1994-06-29

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