DE3644387C1 - Process for the dense covering of a surface with fine liquid droplets - Google Patents

Process for the dense covering of a surface with fine liquid droplets

Info

Publication number
DE3644387C1
DE3644387C1 DE19863644387 DE3644387A DE3644387C1 DE 3644387 C1 DE3644387 C1 DE 3644387C1 DE 19863644387 DE19863644387 DE 19863644387 DE 3644387 A DE3644387 A DE 3644387A DE 3644387 C1 DE3644387 C1 DE 3644387C1
Authority
DE
Germany
Prior art keywords
liquid droplets
fine liquid
corona
aerosol
dense covering
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.)
Expired
Application number
DE19863644387
Other languages
German (de)
Inventor
Ernst-Guenter Dr Lierke
Rudolf Dipl-Ing Grossbach
Rolf Dipl-Ing Hartmann
Klaus-Dieter Dipl-Ing Luehmann
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.)
Battelle Institut eV
Original Assignee
Battelle Institut eV
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 Battelle Institut eV filed Critical Battelle Institut eV
Priority to DE19863644387 priority Critical patent/DE3644387C1/en
Priority to PCT/EP1987/000796 priority patent/WO1988004958A1/en
Application granted granted Critical
Publication of DE3644387C1 publication Critical patent/DE3644387C1/en
Expired 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
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
    • 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
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/007—Processes for applying liquids or other fluent materials using an electrostatic field
    • 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

Landscapes

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

Abstract

A process for coating a surface of insulating material with a thick layer of fine liquid droplets generated by ultrasonic atomization, then electrically charged with alternating polarities and finally electrostatically deposited on the surface. By using an alternating polarity, practically any desired quantity of aerosol can be completely and very uniformly deposited.

Description

Die Erfindung betrifft ein Verfahren zur dichten Belegung einer aus Isolatormaterial bestehenden Oberfläche eines Körpers mit feinen Flüssigkeitströpfchen, wobei diese durch Ultraschallvernebelung erzeugt, anschließend über eine Koronaspitze durch eine Koronaentladung elektrisch aufge­ laden und dann elektrostatisch auf der Oberfläche abgeschieden werden.The invention relates to a method for dense occupancy a surface made of insulator material Body with fine droplets of liquid, these through Ultrasonic nebulization generated, then over a Corona tip electrically opened by a corona discharge charge and then electrostatically on the surface be deposited.

Dieses Verfahren dient zur Oberflächenbehandlung beliebig geformter Festkörper, insbesondere zum Zwecke einer che­ mischen oder physikalischen Modifikation oder auch zum Färben, Drucken, Beschichten und dergleichen. Ein solches Verfahren ist bekannt durch die DE-OS 34 14 245 der Anmelderin. Es hat sich an und für sich bewährt.This method is used for any surface treatment shaped solid, in particular for the purpose of a che mix or physical modification or Dyeing, printing, coating and the like. Such one The method is known from DE-OS 34 14 245 of Applicant. It has proven itself in and of itself.

Will man nach diesem bekannten Verfahren Oberflächen be­ schichten, die aus Isolatormaterial bestehen, so lädt sich jedoch nach einer gewissen Zeit die zu beschichtende, elektrisch isolierte Fläche durch die abgeschiedenen Aerosoltropfen mehr oder weniger schnell auf, und zwar in der Polarität der Aerosoltropfen, die vorher durch die Koronaentladung elektrisch negativ aufgeladen wurden. Nach einer gewissen Zeit können sich also keine Aerosoltropfen mehr abscheiden, weil durch die Flächenladung ein elektrisches, gleichpoliges Gegenfeld aufgebaut wurde, das die Feldstärke an der Koronaspitze abschirmt. Die Koronaent­ ladung erlischt dann und beendet die elektrostatische Aerosolaufladung und -abscheidung.If you want to be surfaces using this known method layers that consist of insulator material, so loads after a certain time, however, the electrically isolated area through the secluded Aerosol drops more or less quickly, and in the polarity of the aerosol drops, which were previously caused by the Corona discharge were negatively charged electrically. To aerosol drops cannot accumulate for a certain time deposit more because of the area charge electrical, homopolar opposing field was built that shields the field strength at the corona tip. The coronaent The charge then goes out and the electrostatic stops Aerosol charging and separation.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren mit den eingangs genannten Merkmalen vorzuschlagen, mit dem auch auf aus Isolatormaterial bestehenden Oberflächen praktisch beliebig viel Aerosol, gegebenenfalls auch aus nicht leitenden Flüssigkeiten, vollständig und gleichmäßig abgeschieden werden kann.The invention is therefore based on the object Process with the features mentioned at the beginning  to propose, with also made of insulator material existing surfaces practically any amount of aerosol, possibly also from non-conductive liquids, can be deposited completely and evenly.

Zur Lösung dieser Aufgabe ist die Erfindung dadurch gekenn­ zeichnet, daß die die Koronaentladung bewirkende Korona­ spitze abwechselnd an positive und an negative Spannung ge­ legt wird.To achieve this object, the invention is characterized indicates that the corona causing the corona discharge alternating between positive and negative voltage is laid.

Dadurch wird das vorher beobachtete Erlöschen der Korona­ entladung und damit die Begrenzung der Abscheidewirkung sicher verhindert und es können beliebige Mengen von Feinst­ aerosolen auf der Isolatorfläche abgeschieden werden. Der Aerosolstrom wird nämlich abwechselnd mit Elektronen bzw. positiven Gasionen geladen und in beiden Fällen im Feld zwischen der Koronaspitze und der Massenelektrode zu der dazwischenliegenden Isolatorfläche geführt und dort abge­ schieden. Das Wechseln der Polarität der Koronaspitze soll nach einem meßbaren Rückgang oder nach dem Erlöschen des Koronastroms infolge Feldabschirmung erfolgen.This will make the previously observed extinction of the corona discharge and thus the limitation of the separation effect safely prevented and any amount of fine aerosols are deposited on the insulator surface. The Aerosol flow is namely alternated with electrons or positive gas ions and in both cases in the field between the corona tip and the ground electrode to the interposed insulator surface and abge there divorced. Changing the polarity of the corona tip should after a measurable decrease or after the expiration of the Corona current occurs as a result of field shielding.

Die vorhergehende gegenpolare Flächenaufladung bewirkt nunmehr eine effektive Erhöhung der Feldstärke, die erst durch weitere Abscheidung allmählich wieder abgebaut wird, bis man diesem Effekt durch eine abermalige Umpolung wieder entgegenwirkt.The previous counter-polar surface charge causes now an effective increase in field strength, the first is gradually broken down again by further separation, until you get this effect again by reversing the polarity counteracts.

Durch das periodische Umpolen der Koronaspitze läßt sich somit auf diese Weise selbst auf Nichtleitern beliebig viel Aerosol vollständig und gleichmäßig abscheiden, und zwar auch bei Verwendung nicht leitender Flüssigkeiten als Aerosole. By periodically reversing the polarity of the corona tip thus any amount, even on non-conductors Separate aerosol completely and evenly even when using non-conductive liquids as Aerosols.  

Bezüglich weiterer Einzelheiten der erfindungsgemäßen Ver­ fahrensführung sei auf die Offenbarung der eingangs erwähnten deutschen Offenlegungsschrift 34 14 245 verwiesen.With regard to further details of the Ver driving is based on the revelation of the beginning referred to German published application 34 14 245.

Claims (1)

Verfahren zur dichten Belegung einer aus Isolatormaterial bestehenden Oberfläche eines Körpers mit feinen Flüssig­ keitströpfchen, wobei diese durch Ultraschallvernebelung er­ zeugt, anschließend über eine Koronaspitze durch eine Koronaentladung elektrisch aufgeladen und dann elektro­ statisch auf der Oberfläche abgeschieden werden, dadurch gekennzeichnet, daß die die Koronaentladung bewirkende Koronaspitze abwechselnd an positive bzw. an negative Spannung gelegt wird.A method for the dense covering of an insulator material surface of a body with fine liquid droplets, these being generated by ultrasonic nebulization, then electrically charged via a corona tip by a corona discharge and then electrostatically deposited on the surface, characterized in that the corona discharge is caused Corona tip is alternately applied to positive or negative voltage.
DE19863644387 1986-12-24 1986-12-24 Process for the dense covering of a surface with fine liquid droplets Expired DE3644387C1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19863644387 DE3644387C1 (en) 1986-12-24 1986-12-24 Process for the dense covering of a surface with fine liquid droplets
PCT/EP1987/000796 WO1988004958A1 (en) 1986-12-24 1987-12-18 Process for coating surfaces with a thick layer of fine liquid droplets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863644387 DE3644387C1 (en) 1986-12-24 1986-12-24 Process for the dense covering of a surface with fine liquid droplets

Publications (1)

Publication Number Publication Date
DE3644387C1 true DE3644387C1 (en) 1988-04-14

Family

ID=6317154

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19863644387 Expired DE3644387C1 (en) 1986-12-24 1986-12-24 Process for the dense covering of a surface with fine liquid droplets

Country Status (2)

Country Link
DE (1) DE3644387C1 (en)
WO (1) WO1988004958A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3925539A1 (en) * 1989-08-02 1991-02-07 Hoechst Ag METHOD AND DEVICE FOR COATING A LAYER

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1432006A (en) * 1972-06-27 1976-04-14 Scient Enterprises Inc Ion production
DE2247701A1 (en) * 1972-09-28 1974-04-11 Heinz Dr Haase METHOD AND DEVICE FOR APPLYING SOLID OR LIQUID PARTICLES TO SURFACES BY USING ELECTRIC FIELD FORCE
DE3414245A1 (en) * 1984-04-14 1985-10-17 Battelle-Institut E.V., 6000 Frankfurt Method and device for coating, in a sealed fashion, the surfaces of solids with fine droplets of fluid

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NICHTS ERMITTELT *

Also Published As

Publication number Publication date
WO1988004958A1 (en) 1988-07-14

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Legal Events

Date Code Title Description
8100 Publication of the examined application without publication of unexamined application
D1 Grant (no unexamined application published) patent law 81
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee