EP0941768A2 - Dispositif et procédé pour l'application de poudre chargée électrostatiquement sur un object électriquement conducteur mis à la terre - Google Patents

Dispositif et procédé pour l'application de poudre chargée électrostatiquement sur un object électriquement conducteur mis à la terre Download PDF

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Publication number
EP0941768A2
EP0941768A2 EP99101633A EP99101633A EP0941768A2 EP 0941768 A2 EP0941768 A2 EP 0941768A2 EP 99101633 A EP99101633 A EP 99101633A EP 99101633 A EP99101633 A EP 99101633A EP 0941768 A2 EP0941768 A2 EP 0941768A2
Authority
EP
European Patent Office
Prior art keywords
powder
cavity
application head
distance
outlet opening
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Withdrawn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
EP99101633A
Other languages
German (de)
English (en)
Other versions
EP0941768A3 (fr
Inventor
Horst Dr. Adams
Otmar Göbl
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.)
Wagner International AG
Original Assignee
Wagner International AG
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 Wagner International AG filed Critical Wagner International AG
Publication of EP0941768A2 publication Critical patent/EP0941768A2/fr
Publication of EP0941768A3 publication Critical patent/EP0941768A3/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Withdrawn legal-status Critical Current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
    • 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
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying 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
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/10—Arrangements for collecting, re-using or eliminating excess spraying material the excess material being particulate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/30—Arrangements for collecting, re-using or eliminating excess spraying material comprising enclosures close to, or in contact with, the object to be sprayed and surrounding or confining the discharged spray or jet but not the object to be sprayed

Definitions

  • Electrostatic spray devices such as spray guns, have long been known and in use.
  • the invention has for its object a method and an apparatus to create the type mentioned, with which an exact sharply contoured powder application free of turbulence on an object, such as a workpiece is.
  • a device according to claim serves to solve this problem 1 and a method according to claim 8.
  • the invention uses the inversely proportional to the square of the distance a between the workpiece surface and the powder outlet opening of the device changing electrostatic attraction F off. Because this force is also bilateral from the outlet opening decreases quadratically with the distance, can be by Adjust the distance from the powder outlet to a side sharp Apply limited area if the device is relative to that with powder too spraying the surface of the object while maintaining an "order spacing" is moved.
  • the device according to the invention enables electrostatic Powder coating with a very small order spacing, as it is for example is useful for the internal coating of hollow bodies.
  • The is at Powder spray guns undesirable effect of excessive powder leakage, the so-called "overspraying", completely avoided.
  • the invention thus creates a device that applies the sharp contours from powder to the surface of a workpiece as precisely as with one for the allows liquid paint brush to be used.
  • the new device can therefore also be called a "powder brush”.
  • the device shown in FIG. 1 has an application head 10 which has a cavity 1 contains.
  • a powder feed line 2 with a nozzle 20th
  • a powder air mixture is blown in at the free end in the direction of arrow 3.
  • a parallel suction line 4 introduced into the cavity for feed line 2 serves for suction of powder air mixture.
  • the feed line 2 does not communicate with one shown powder tank, while the suction line the powder in the direction of Arrow 5 leads to a recovery unit, not shown, which has a filter and / or can comprise a cyclone of known design.
  • the application head 10 has a powder outlet opening 6 which in the direction of arrow 11 on the surface 12 of an electrically grounded at 13 conductive object or workpiece 8 is directed and over their entire Opening area has the same application distance a from the surface 12.
  • the order header 10 is in the constant order interval a in the direction of the double arrow 14 movable parallel to the surface 12. The movement of the application head 10 can be generated manually or by motor.
  • a high voltage electrode 7 for charging of the powder blown into the cavity 1 via the nozzle 20.
  • the powder can also be electrostatically charged in or in front of the feed line 2 become.
  • the powder outlet opening 6 is advantageously dimensioned such that when a predetermined safety distance from the surface 12 is exceeded, no more powder emerges at all, but rather the entire amount of powder emerging from the nozzle 20 into the cavity 1 is sucked off again via the suction line 4. So no powder is lost.
  • Fig. 2 shows a modification in which the application head 10 with a spacer 30 is provided, which can take the form of a guide 30, for example.
  • guide 30 comprises stationary rails and on one with the application head 10 fixed suspension 32 mounted guide wheels or skids 9, so that the application head 10 can be moved at a constant distance a from the workpiece is.
  • Rails and skids / wheels also any other, known to those skilled in the art Versions of spacers can be used, provided that they only move the Enable application head over the surface 12 with a constant distance a.
  • This movement can also be a "free" movement, i.e. a straight or curved one or abruptly angled movement in any direction in one be parallel to the surface in the order distance a plane.
EP99101633A 1998-03-13 1999-02-04 Dispositif et procédé pour l'application de poudre chargée électrostatiquement sur un object électriquement conducteur mis à la terre Withdrawn EP0941768A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19811085 1998-03-13
DE19811085A DE19811085A1 (de) 1998-03-13 1998-03-13 Vorrichtung und Verfahren zum Auftragen von elektrostatisch aufgeladenem Pulver auf einen geerdeten, elektrisch leitfähigen Gegenstand

Publications (2)

Publication Number Publication Date
EP0941768A2 true EP0941768A2 (fr) 1999-09-15
EP0941768A3 EP0941768A3 (fr) 2002-10-02

Family

ID=7860882

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99101633A Withdrawn EP0941768A3 (fr) 1998-03-13 1999-02-04 Dispositif et procédé pour l'application de poudre chargée électrostatiquement sur un object électriquement conducteur mis à la terre

Country Status (2)

Country Link
EP (1) EP0941768A3 (fr)
DE (1) DE19811085A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006073598A1 (fr) * 2004-12-30 2006-07-13 Wm. Wrigley Jr. Company Compositions et procedes pour enrober des surfaces de produits de confiserie au moyen de poudres chargees electrostatiquement
US10334867B2 (en) 2014-03-03 2019-07-02 Intercontinental Great Brands Llc Method for manufacturing a comestible
US10973238B2 (en) 2011-03-11 2021-04-13 Intercontinental Great Brands Llc System and method of forming multilayer confectionery
US11122815B2 (en) 2011-07-21 2021-09-21 Intercontinental Great Brands Llc System and method for forming and cooling chewing gum

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10124110A1 (de) 2001-05-17 2002-12-05 Bosch Gmbh Robert Markiervorrichtung zum Anbringen von Markierungen an einer Fläche
DE20217416U1 (de) 2002-11-08 2003-05-28 Wagner Internat Ag Altstaetten Vorrichtung zum Beschichten eines Werkstücks mit Pulver

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5243846A (en) * 1975-10-03 1977-04-06 Senichi Masuda Device for electrostatic powder coating
JPS644272A (en) * 1987-06-24 1989-01-09 Hideo Nagasaka Electrostatic powder coating device
DE3740498A1 (de) * 1987-11-30 1989-06-08 Matthaeus Heinz Dieter Vorrichtung zum thermischen beschichten von oberflaechen
DE3933745A1 (de) * 1989-10-10 1991-04-11 Hestermann Gerhard Beschichtungseinrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006073598A1 (fr) * 2004-12-30 2006-07-13 Wm. Wrigley Jr. Company Compositions et procedes pour enrober des surfaces de produits de confiserie au moyen de poudres chargees electrostatiquement
US10973238B2 (en) 2011-03-11 2021-04-13 Intercontinental Great Brands Llc System and method of forming multilayer confectionery
US11930830B2 (en) 2011-03-11 2024-03-19 Intercontinental Great Brands Llc System and method of forming multilayer confectionery
US11122815B2 (en) 2011-07-21 2021-09-21 Intercontinental Great Brands Llc System and method for forming and cooling chewing gum
US10334867B2 (en) 2014-03-03 2019-07-02 Intercontinental Great Brands Llc Method for manufacturing a comestible

Also Published As

Publication number Publication date
DE19811085A1 (de) 1999-09-23
EP0941768A3 (fr) 2002-10-02

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