EP0347591A2 - Process and device for spraying paints and lakes - Google Patents

Process and device for spraying paints and lakes Download PDF

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Publication number
EP0347591A2
EP0347591A2 EP89109097A EP89109097A EP0347591A2 EP 0347591 A2 EP0347591 A2 EP 0347591A2 EP 89109097 A EP89109097 A EP 89109097A EP 89109097 A EP89109097 A EP 89109097A EP 0347591 A2 EP0347591 A2 EP 0347591A2
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EP
European Patent Office
Prior art keywords
compressed air
spraying
heating wire
wire spiral
spray
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Withdrawn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
EP89109097A
Other languages
German (de)
French (fr)
Other versions
EP0347591A3 (en
Inventor
Rudolf Kühnl
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 EP0347591A2 publication Critical patent/EP0347591A2/en
Publication of EP0347591A3 publication Critical patent/EP0347591A3/en
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • B05B7/16—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 incorporating means for heating or cooling the material to be sprayed
    • B05B7/1606—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 incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air
    • B05B7/1613—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 incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed
    • B05B7/1646—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 incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed the material to be sprayed and the atomising fluid being heated by the same source of heat, without transfer of heat between atomising fluid and material to be sprayed
    • 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

Definitions

  • the invention relates to a method for preferably electrostatic spraying of paints and varnishes using compressed air according to the preamble of claim 1.
  • the invention relates to a device for carrying out such a method according to the preamble of claim 3.
  • Such methods and devices have long been known and are used in practice.
  • the method mentioned, also referred to in practice as hot spraying is used in particular when the respective paint cannot be sprayed satisfactorily at normal temperature due to its ability (viscosity).
  • Corresponding devices then have a feed hose to the spray gun for the purpose of heating the spray material, which is wrapped by an electrical heating wire spiral.
  • the paint in the supply hose must be heated to a considerable temperature if the effect of improved spraying is to be achieved.
  • the object of the invention is therefore to improve the known methods and devices for hot spraying in such a way that the heating material can also be used at lower heating temperatures. This object is achieved in terms of the method in accordance with the characterizing part of patent claim 1 and in terms of the device in accordance with the characterizing part of patent claim 3.
  • the spray material not only is the spray material heated, as usual, but also the compressed air supplied. This ensures that the spray material does not cool down when it emerges from the spray nozzle, and is possibly even further heated by the compressed air.
  • spray paints and paints can be used with heating temperatures which are below the respective flash point, which means that hot spraying can essentially be used in more cases than previously.
  • 10 denotes a supply hose for spray material and 11 a supply hose for compressed air, the two hoses 10, 11 running parallel to one another with a small spacing.
  • the spray material hose 10 has at its two ends a transition connection 10a to the spray material source (not shown) (paint container, paint pump) and a transition connection 10b to the spray gun (not shown), the compressed air hose 11 has a transition connection 11a to the compressed air supply source (compressed air network, compressed air pump) and a transition connection 11b to the spray gun).
  • the two hoses 10, 11 are wrapped in the area between the transition connections by a common heating wire spiral 12, which in turn is surrounded by an insulating layer 13.
  • a braid jacket 14 serves as the outer covering.
  • 15a and 15b represent end covers.
  • 16 denotes an electrical supply for the heating wire spiral 12.
  • the heating wire spiral 12 is supplied with electrical current via the line 16, with the result that the heating spiral 12 heats up and thus heats both the spray material flowing in the hose 10 and the compressed air flowing in the hose 11.
  • the heating temperature of the sprayed material and compressed air depend on a whole range of factors, in particular the amount of electrical energy supplied, the dimensioning of the heating wire spiral, the thermal resistance of the hose material and the flow rate of the spray material and air, but these factors are comparatively easy to master, so it is in practice no problem to measure these factors so that the desired and specified heating temperatures are reached .
  • the factors can be selected such as the specific thermal conductivity or the thickness of the two hose sleeves so that the sprayed material and compressed air reach the same heating temperature or that the sprayed material and compressed air have heating temperatures of the specified temperature difference. In the latter case, it may be advantageous to heat the compressed air more than the spray material, with which the spray material only reaches the optimum temperature for spraying when it is sprayed.
  • the device shown can undergo modifications without leaving the scope of the invention.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Nozzles (AREA)

Abstract

Beim vorzugsweise elektrostatischen Versprühen von Farben und Lacken ist es bekannt, das Spritzgut zu erwärmen. Erfolgt das Versprühen unter Verwendung von Druckluft, dann soll erfindungsgemäß auch die Druckluft im erwärmten Zustand dem Sprühorgan zugeführt werden. Zu diesem Zweck werden der Zuführschlauch für das Spritzgut (10) und derjenige für die Druckluft (11) mit einer gemeinsamen elektrischen Heizspirale (12) umgeben.When preferably spraying paints and varnishes electrostatically, it is known to heat the spray material. If the spraying is carried out using compressed air, then according to the invention the compressed air should also be supplied to the spraying element in the heated state. For this purpose, the feed hose for the spray material (10) and that for the compressed air (11) are surrounded by a common electrical heating coil (12).

Description

Die Erfindung betrifft ein Verfahren zum vorzugsweise elektro­statischen Versprühen von Farben und Lacken unter Anwendung von Druckluft gemäß dem Oberbegriff des Patentanspruches 1. Außerdem betrifft die Erfindung eine Vorrichtung zur Durchführung eines solchen Verfahrens gemäß dem Oberbegriff des Patentanspruches 3. Derartige Verfahren und Vorrichtungen sind seit langem bekannt und werden in der Praxis eingesetzt. Das erwähnte Verfahren, in der Praxis auch mit Heißspritzen bezeichnet, wird insbesondere dann angewendet, die jeweilige Farbe aufgrund ihrer Fähigkeit (Viskosität) bei Normaltemperatur nicht zufriedenstellend ver­sprüht werden kann. Entsprechende Vorrichtungen weisen dann zwecks Erwärmung des Sprühguts einen Zuführschlauch zur Spritzpistole auf, der von einer elektrischen Heizdrahtspiral umwendelt ist. Es hat sich jedoch gezeigt, daß die Farbe im Zuführschlauch auf eine be­trächtliche Temperatur erhitzt werden muß, wenn der Effekt des verbesserten Versprühens tatsächlich erreicht werden soll. Der Grund dafür liegt wohl darin, daß die erwärmte Farbe beim Austritt aus der Sprühdüse sofort mit der nur Umgebungstemperatur aufwei­senden Umgebungsluft in Berührung kommt und dabei noch während des Versprühens stark abgekühlt wird. Dies ist insbesondere dann der Fall, wenn das Versprühen unter Anwendung von Druckluft er­folgt. In vielen Fällen ist es aber schon aus Gründen des Explo­sionsschutzes nicht möglich bzw. zulässig, das Sprühgut im Zu­führschlauch auf die erforderliche Temperatur zu erhitzen, ins­besondere bei Farben und Lacken mit vergleichsweise niedrigem Flammpunkt.The invention relates to a method for preferably electrostatic spraying of paints and varnishes using compressed air according to the preamble of claim 1. In addition, the invention relates to a device for carrying out such a method according to the preamble of claim 3. Such methods and devices have long been known and are used in practice. The method mentioned, also referred to in practice as hot spraying, is used in particular when the respective paint cannot be sprayed satisfactorily at normal temperature due to its ability (viscosity). Corresponding devices then have a feed hose to the spray gun for the purpose of heating the spray material, which is wrapped by an electrical heating wire spiral. However, it has been found that the paint in the supply hose must be heated to a considerable temperature if the effect of improved spraying is to be achieved. The reason for this is probably that the heated paint immediately comes into contact with the ambient air, which only has ambient temperature, when it emerges from the spray nozzle, and is thereby strongly cooled while spraying. This is particularly the case if the spraying is carried out using compressed air. In many cases, for reasons of explosion protection alone, it is not possible or permitted to heat the sprayed material in the supply hose to the required temperature, especially for paints and varnishes with a comparatively low flash point.

Aufgabe der Erfindung ist es deshalb, die bekannten Verfahren und Vorrichtungen zum Heißspritzen derart zu verbessern, daß auch mit niedrigeren Erwärmungstemperaturen für das Sprühgut auszukommen ist. Die Lösung dieser Aufgabe erfolgt verfahrensmäßig gemäß dem Kennzeichen des Patentanspruches 1, vorrichtungsmäßig gemäß dem Kennzeichen des Patentanspruches 3.The object of the invention is therefore to improve the known methods and devices for hot spraying in such a way that the heating material can also be used at lower heating temperatures. This object is achieved in terms of the method in accordance with the characterizing part of patent claim 1 and in terms of the device in accordance with the characterizing part of patent claim 3.

Gemäß der Erfindung wird also nicht nur, wie üblich, das Sprüh­gut erwärmt, sondern darüberhinaus auch die zugeführte Druck­luft. Damit wird erreicht, daß das Sprühgut beim Austritt aus der Sprühdüse keine Abkühlung erfährt, gegebenenfalls sogar durch die Druckluft noch weiter erwärmt wird. Versuche haben ergeben, daß damit im wesentlichen bei allen handelsüblichen Sprühlacken und -farben mit Erwärmungstemperaturen auszukommen ist, die unter dem jeweiligen Flammpunkt liegen, womit das Heiß­spritzen im wesentlichen in mehr Fällen anwendbar ist als bisher.According to the invention, not only is the spray material heated, as usual, but also the compressed air supplied. This ensures that the spray material does not cool down when it emerges from the spray nozzle, and is possibly even further heated by the compressed air. Experiments have shown that essentially all commercially available spray paints and paints can be used with heating temperatures which are below the respective flash point, which means that hot spraying can essentially be used in more cases than previously.

Auf der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt, und zwar zeigt die einzige Figur den wesentlichen Teil der Vorrichtung, teilweise im Längsschnitt.In the drawing, an embodiment of the invention is shown, and that the single figure shows the essential part of the device, partially in longitudinal section.

Auf der Zeichnung ist mit 10 ein Zuführschlauch für Sprühgut und mit 11 ein Zuführschlauch für Druckluft bezeichnet, wobei die beiden Schläuche 10, 11 achsparallel mit geringem Abstand neben­einander verlaufen. Der Sprühgutschlauch 10 weist an seinen bei­den Enden einen Übergangsanschluß 10a zur -nicht gezeichneten- Sprühgutquelle (Farbbehälter, Farbpumpe) und einen Übergangsan­schluß 10b zur -nicht gezeichneten- Spritzpistole auf, der Druck­luftschlauch 11 einen Übergangsanschluß 11a zur Druckluft-Speise­quelle (Druckluftnetz, Druckluftpumpe) und einen Übergangsan­schluß 11b zur Spritzpistole). Die beiden Schläuche 10, 11 sind in dem Bereich zwischen den Übergangsanschlüssen von einer ge­meinsamen Heizdrahtspirale 12 umwendelt, die ihrerseits von ei­ner Isolierschicht 13 umgeben ist. Als Außenhülle dient ein Ge­flechtmantel 14. 15a und 15b stellen stirnseitige Abdeckungen dar. Mit 16 schließlich ist eine elektrische Zuführung für die Heizdrahtspirale 12 bezeichnet.In the drawing, 10 denotes a supply hose for spray material and 11 a supply hose for compressed air, the two hoses 10, 11 running parallel to one another with a small spacing. The spray material hose 10 has at its two ends a transition connection 10a to the spray material source (not shown) (paint container, paint pump) and a transition connection 10b to the spray gun (not shown), the compressed air hose 11 has a transition connection 11a to the compressed air supply source (compressed air network, compressed air pump) and a transition connection 11b to the spray gun). The two hoses 10, 11 are wrapped in the area between the transition connections by a common heating wire spiral 12, which in turn is surrounded by an insulating layer 13. A braid jacket 14 serves as the outer covering. 15a and 15b represent end covers. Finally, 16 denotes an electrical supply for the heating wire spiral 12.

Beim Betrieb wird die Heizdrahtspirale 12 über die Leitung 16 mit elektrischem Strom versorgt, mit der Folge einer Erhitzung der Heizspirale 12 und damit einer Erwärmung sowohl des im Schlauch 10 strömenden Sprühguts als auch der im Schlauch 11 strömenden Druckluft. Die Erwärmungstemperatur von Sprühgut und Druckluft hängen dabei von einer ganzen Reihe von Faktoren ab, insbesondere der Höhe der zugeführten elektrischen Energie, der Dimensionierung der Heizdrahtspirale, dem Wärmewiderstand des Schlauchmaterials und der Strömungsgeschwindigkeit von Sprühgut und Luft, wobei jedoch diese Faktoren vergleichsweise leicht zu beherrschen sind, es also in der Praxis keinerlei Schwierigkeiten bereitet, diese Faktoren so zu bemessen, daß die erwünschten und vorgebebenen Erwärmungstemperaturen erreicht werden. Dabei können die Faktoren so gewählt werden, beispiels­weise der spezifische Wärmeleitwert oder die Dicke der beiden Schlauchmäntel, daß Sprühgut und Druckluft dieselbe Erwärmungs­temperatur erreicht oder aber Sprühgut und Druckluft Erwärmungs­temperaturen`vorgegebener Temperaturdifferenz aufweisen. Im letzteren Fall kann es vorteilhaft sein, die Druckluft stärker zu erwärmen, als das Sprühgut, womit dann das Sprühgut erst zum Zeitpunkt seines Versprühens die für das Versprühen optimale Temperatur erreicht.During operation, the heating wire spiral 12 is supplied with electrical current via the line 16, with the result that the heating spiral 12 heats up and thus heats both the spray material flowing in the hose 10 and the compressed air flowing in the hose 11. The heating temperature of the sprayed material and compressed air depend on a whole range of factors, in particular the amount of electrical energy supplied, the dimensioning of the heating wire spiral, the thermal resistance of the hose material and the flow rate of the spray material and air, but these factors are comparatively easy to master, so it is in practice no problem to measure these factors so that the desired and specified heating temperatures are reached . The factors can be selected such as the specific thermal conductivity or the thickness of the two hose sleeves so that the sprayed material and compressed air reach the same heating temperature or that the sprayed material and compressed air have heating temperatures of the specified temperature difference. In the latter case, it may be advantageous to heat the compressed air more than the spray material, with which the spray material only reaches the optimum temperature for spraying when it is sprayed.

Selbstverständlich kann die dargestellte Vorrichtung Abwandlungen erfahren, ohnen den Bereich der Erfindung zu verlassen. Dies gilt insbesondere für die Form und Dimensionierung der Heizdrahtspi­rale und für die Anordnung und Ausbildung der Isolierschicht und des Abdeckmantels. Jedenfalls sollte aber darauf geachtet werden, daß zur Vermeidung von Wärmeverlusten eine einwandfreie Iso­lierung im Bereich der Heizdrahtspirale gewährleistet ist und die Anschlüsse in Richtung zu bzw. an der Spritzpistole möglichst kurz sind.Of course, the device shown can undergo modifications without leaving the scope of the invention. This applies in particular to the shape and dimensioning of the heating wire spiral and to the arrangement and design of the insulating layer and the covering jacket. In any case, however, care should be taken to ensure that proper insulation in the area of the heating wire spiral is ensured in order to avoid heat losses and that the connections in the direction of or to the spray gun are as short as possible.

Claims (4)

1. Verfahren zum vorzugsweise elektrostatischen Versprühen von Farben und Lacken unter Anwendung von Druckluft, bei dem das Sprühgut und die Druckluft vor dem Versprühen erwärmt wer­den, dadurch gekennzeichnet, daß Sprühgut und Druckluft auf unter­schiedliche Temperaturen vorerwärmt werden, nämlich die Druck­luft auf eine höhere Temperatur.1. A method for preferably electrostatic spraying of paints and varnishes using compressed air, in which the sprayed material and the compressed air are heated before spraying, characterized in that the sprayed material and compressed air are preheated to different temperatures, namely the compressed air to a higher temperature. 2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 mit einem vom Sprühgut-Vorratsbehälter zur Spritzpistole führenden Farbzuführ-Schlauch und einem von der Druckluft­quelle zur Spritzpistole führenden Luft-Zuführschlauch, wobei der Farb-Zuführschlauch von einer elektrischen Heizdrahtspirale umwendelt ist, dadurch gekennzeichnet, da8 die beiden Zuführschläu­che (10, 11) achsparallel nebeneinander angeordnet sind und die Heizdrahtspirale (12) die beiden Zuführschläuche (10, 11) gemein­sam umwendelt.2. Apparatus for carrying out the method according to claim 1 with a paint supply hose leading from the spray material reservoir to the spray gun and an air supply hose leading from the compressed air source to the spray gun, the paint supply hose being wrapped by an electric heating wire spiral, characterized in that8 the two supply hoses (10, 11) are arranged axially parallel next to one another and the heating wire spiral (12) coils the two supply hoses (10, 11) together. 3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die beiden Zuführschläuche (10, 11) mit der sie umgebenden Heiz­drahtspirale (12) von einem gemeinsamen Isoliermantel (13) um­geben sind.3. Apparatus according to claim 2, characterized in that the two supply hoses (10, 11) with the surrounding heating wire spiral (12) are surrounded by a common insulating jacket (13). 4. Vorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die beiden Zuführschläuche (10, 11) unterschiedliche Wärme­leitfähigkeit besitzen.4. Apparatus according to claim 2 or 3, characterized in that the two supply hoses (10, 11) have different thermal conductivity.
EP19890109097 1988-06-24 1989-05-19 Process and device for spraying paints and lakes Withdrawn EP0347591A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3821439 1988-06-24
DE3821439A DE3821439C1 (en) 1988-06-24 1988-06-24

Publications (2)

Publication Number Publication Date
EP0347591A2 true EP0347591A2 (en) 1989-12-27
EP0347591A3 EP0347591A3 (en) 1991-03-27

Family

ID=6357220

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890109097 Withdrawn EP0347591A3 (en) 1988-06-24 1989-05-19 Process and device for spraying paints and lakes

Country Status (4)

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EP (1) EP0347591A3 (en)
JP (1) JPH0278464A (en)
DE (1) DE3821439C1 (en)
DK (1) DK312689A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997044818A1 (en) * 1996-05-21 1997-11-27 Symetrix Corporation Method and apparatus for misted liquid source deposition of thin films with increased yield

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE488622A (en) *
US2576942A (en) * 1948-07-06 1951-12-04 American Can Co Apparatus for the continuous spraying of individual container bodies
FR88147E (en) * 1963-12-14 1966-12-16 Device for heating a fluid stream
JPS5298755A (en) * 1976-02-17 1977-08-18 Iwata Air Compressor Mfg Hot air spray gun
DE3416105A1 (en) * 1984-04-30 1985-11-07 Meltex Verbindungstechnik GmbH, 2120 Lüneburg MELT ADHESIVE HOSE
JPS61259776A (en) * 1985-05-13 1986-11-18 Nippon Sheet Glass Co Ltd Method and apparatus for spraying hot melt type adhesive

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997044818A1 (en) * 1996-05-21 1997-11-27 Symetrix Corporation Method and apparatus for misted liquid source deposition of thin films with increased yield
US5932295A (en) * 1996-05-21 1999-08-03 Symetrix Corporation Method and apparatus for misted liquid source deposition of thin films with increased yield

Also Published As

Publication number Publication date
DK312689A (en) 1989-12-25
DE3821439C1 (en) 1989-01-19
DK312689D0 (en) 1989-06-23
EP0347591A3 (en) 1991-03-27
JPH0278464A (en) 1990-03-19

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