EP0192028B1 - Verfahren zum Auftragen von Sprühgut mittels einer Sprühvorrichtung und zugehörige Sprühvorrichtung - Google Patents

Verfahren zum Auftragen von Sprühgut mittels einer Sprühvorrichtung und zugehörige Sprühvorrichtung Download PDF

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Publication number
EP0192028B1
EP0192028B1 EP86100226A EP86100226A EP0192028B1 EP 0192028 B1 EP0192028 B1 EP 0192028B1 EP 86100226 A EP86100226 A EP 86100226A EP 86100226 A EP86100226 A EP 86100226A EP 0192028 B1 EP0192028 B1 EP 0192028B1
Authority
EP
European Patent Office
Prior art keywords
gas
spraying apparatus
spray material
spray
head
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
EP86100226A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0192028A1 (de
Inventor
Norbert Lauter
Wolfgang Dr. Fischer
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.)
Kopperschmidt-Muller GmbH and Co KG
Original Assignee
Kopperschmidt-Muller GmbH and Co KG
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 Kopperschmidt-Muller GmbH and Co KG filed Critical Kopperschmidt-Muller GmbH and Co KG
Priority to AT86100226T priority Critical patent/ATE38948T1/de
Publication of EP0192028A1 publication Critical patent/EP0192028A1/de
Application granted granted Critical
Publication of EP0192028B1 publication Critical patent/EP0192028B1/de
Expired legal-status Critical Current

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    • 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
    • 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

Definitions

  • the invention relates to a method for applying spray material (except for release agents for the production of objects made of polyurethane foam) by means of a spray device, in which the spray material supplied to the spray device in the liquid state is atomized and at the same time gas at a higher temperature than the spray material and heat is supplied dispenses to the spray material leaving the spray device, and to a spray device with a head, which has an atomizing nozzle connected to a good supply line and at least one gas outlet opening, which is connected to a gas supply line having a heating device for the gas, with gas and Good valves and associated actuation device and, if necessary, with a handle such as a pistol grip.
  • Such a method is known from DE-A-3 226 989.
  • an acrylic resin paint is mixed with a heat-sensitive organic acid catalyst and atomized with the aid of atomizing air through the nozzle of a spray gun.
  • the paint should dry in a relatively short period of time, so that a dust-free surface is created on the painted workpiece.
  • the atomizing air is introduced at a very low pressure but with a large volume. Their temperature is comparatively low. The heat transfer and thus the heating of the spray material is limited.
  • thermoplastic It is also known (DE-A-3 225 844) to melt a thermoplastic by means of heating devices which are arranged in front of and in the spraying device and to atomize it through a nozzle. This atomization can also be done airless under high pressure.
  • the compressed gas supplied at the same time should be at about the same temperature as the plastic so that no undesired cooling effects occur.
  • the gas supplied which is used either for atomizing itself or for shaping the spray jet, has room temperature.
  • the invention has for its object to develop a method of the type described above so that the desired heating of the spray material can be carried out with a gas of a higher temperature or with a smaller amount of gas.
  • This object is achieved according to the invention in a method of the type mentioned at the outset in that the spray material is atomized hydrostatically and in that the gas at a higher temperature is fed in a directional manner via gas outlet openings in such a way that it is in the atomization area, where the spray jet is still compact or immediately afterwards, strikes the spray material.
  • the gas influences the spray material at a point where the spray jet is still compact or immediately afterwards, there is good heat transfer. A comparatively small amount of gas is sufficient to achieve the desired effects. Since, due to the hydrostatic atomization, the spray material cools down when it emerges from the atomizer nozzle due to the relaxation, a large temperature difference favoring the heat transfer results. The warming can also lead to better atomization.
  • liquid materials can be considered as spray material, such as suspensions, dispersions, emulsions or solutions. They are used to coat objects, be it as paint or varnish, as a binder, as an adhesive, etc. Like. With many materials, the heating results in a reduction in viscosity.
  • the droplets are more fluid when they hit the surface to be coated and therefore adapt better to this surface.
  • an additive such as a solvent or carrier liquid
  • a larger part of this additive is removed by evaporation before it hits the surface to be coated.
  • the coating therefore dries faster, so that it adheres to the object shortly after the spraying process, and this can be processed without delay.
  • the atomization can take place with and without electrostatic charging.
  • the gas temperature can be higher than the permissible upper limit temperature of the atomized spray or spray material.
  • the higher the temperature of the gas the stronger it is Warming of the droplets and the greater the desired effect.
  • the sprayed or sprayed material can be exposed to a higher temperature than it corresponds to its permissible upper limit temperature specified in the specification, because the limit temperature in the spray droplets is exceeded for a very short time and therefore no damage (decomposition of the sprayed or sprayed material, Explosions and the like) are to be feared, as would be the case if the unsprayed material were overheated.
  • the greater the cooling due to a relaxation of the outlet the higher the gas temperature may be.
  • hot air with a temperature of at least 80 ° C can be used. Temperatures of over 100 ° C are even possible.
  • the sprayed or sprayed material is additionally heated to a temperature below its permissible upper limit temperature before atomization.
  • Such heating of the goods alone is in most cases not sufficient to influence the adhesive and surface properties of the coating.
  • this measure contributes to obtaining the desired effects with smaller amounts of gas, with a lower gas temperature or with greater certainty.
  • a spray device with a head which has an atomizing nozzle connected to a good supply line and at least one gas outlet opening, which is connected to a gas supply line having a heating device for the gas, with gas and good valves and associated actuating device and optionally with a handle, like pistol grip, is characterized according to the invention in that the outer gas supply line coming from the heating device opens at the circumference of the head.
  • the gas supply line running inside the head between the mouth and the gas outlet opening is short.
  • the heat transfer from the hot gas to the other parts of the head is correspondingly low.
  • the entire spray device can be kept at a low temperature level so that it can be handled by an operator.
  • This spray device is particularly suitable for carrying out the method described above, because its advantages also apply at higher gas temperatures.
  • the mouth of the outer gas supply line should be arranged closer to the front of the head than the mouth of the outer good supply line. This gives the shortest length of the gas supply line inside the head.
  • the material feed line can also be provided with a heating device for the spray material. In this way, the unsprayed material can be heated within its permissible range.
  • a heat insulation element is arranged between the head and the handle. Even if the head assumes higher temperatures due to the hot gas, the spray device can still be held by the handle without difficulty.
  • a manual actuation element of the actuation device can be separated from the head by a heat insulation element which is bridged only by valve actuation rods. This manual control element then also does not assume excessively high temperatures.
  • a protective shield between the outer gas supply line and the handle is also recommended. The user's hands are prevented from accidentally coming into contact with the hot outer gas supply line.
  • the heating device preferably has electrical heating resistors in the form of PTC resistors. These can generate relatively large amounts of heat if required, but reduce the current flowing through so much that there is no need for them so that a predetermined upper limit temperature is not exceeded.
  • the heating device should be arranged at a distance from the head. This ensures that the head is not affected by the heater and takes on excessive temperatures.
  • the spray device has a gun 1 with a head 2, which is connected to a housing 4 via a heat insulation element 3. This has a hook 5 at the top for attaching the pistol and a handle 6 in the form of a pistol grip at the bottom in order to be able to hold the pistol by hand.
  • a slit-shaped central atomizer nozzle 7 In the head 2 there is a slit-shaped central atomizer nozzle 7, via which a spray jet 8 can be dispensed hydrostatically.
  • two slit-like gas outlet openings 9, 10 and 11, 12 are provided in projecting horns 13 and 14, from which gas curtains 15, 16, 17 and 18 emerge, which act on the spray jet 8 immediately after the atomizing nozzle 7 hit. This forms the spray jet.
  • an inner feed line 19 which leads to the atomizing nozzle 7 and can be shut off by means of a valve 20.
  • This inner material feed line is connected via an outer material feed line 21 that opens at the periphery to a pump 22, which generates the high pressure required for hydrostatic atomization, and a downstream material heating device 23.
  • an inner return line (not shown) branches off from the inner feed line 19 and is connected to an outer return line 24 which also opens at the periphery. This leads to a container 25 from which the pump 22 sucks in the spray material.
  • the gas outlet openings 9 to 12 are connected via an inner gas feed line 26 and a valve 27 to an outer gas feed line 28 which opens at the outer circumference of the head 2.
  • the gas is supplied to this by a compressor 29 via a gas heating device 30. Air that is drawn in from the environment and then heated is normally used as the gas.
  • the junction of the outer gas supply line 28 is located between the outer good supply line 21 and the end face of the head 2.
  • valve actuation rod 31 or 32 which passes through a seal 33 or 34, passes through the interior 35 of the heat insulation element 3 and is guided at the rear end in bushes 36 and 37, respectively.
  • Stops 38 and 39 fastened to the valve actuation rods are held by means of springs 40 and 41 against cams 42 and 43 of a manual actuation lever 44 which is rotatable about a pivot axis 45 held in the housing 4 and is held in its left end position by a spring 46.
  • the good valve actuation rod 31 can be locked by means of a locking element 47 and the pistol can thus be secured.
  • a protective shield 48 is located between the manual actuating element 44 and the outer supply lines 21 and 28 and the return line 24.
  • the two heating devices 23 and 30 preferably operate electrically and have setting or regulating means in order to impart a predetermined temperature to the material or gas passing therethrough. Electrical heating by means of PTC resistors is particularly suitable for this. However, heating devices of any other kind, for example gas or oil heaters, can also be used.
  • the good heater 23 is optional. It serves to heat the spray material slightly and at most to a temperature that is within the permissible temperature range. In contrast, the gas temperature can be considerably higher. For example, with a permissible upper limit temperature of the sprayed material of approximately 30 °, the gas temperature can be 100 ° or 110 ° C.
  • the gas valve 27 opens and shortly thereafter the good valve 20.
  • the resulting flat spray jet 8 has a completely closed, compact shape in the area 49 immediately after emerging from the atomizer nozzle 7. From a disintegration point, namely in a zone 50, threads result, from which larger and then smaller droplets separate in a zone 51. The atomization zone therefore extends from the atomizer nozzle 7 to the beginning of the region 51.
  • the spray jet 8 is then acted upon by the hot gas from the veils 15 to 18 approximately in region a, preferably in the still compact region 49.
  • the gas heat is transferred to the spray droplets.
  • the resulting overtemperature is only briefly present because the atomizing droplets are only in the area of the heated gas for a fraction of a second and its temperature drops rapidly, be it through the relaxation of the outlet or through the inclusion of room air.
  • the atomizing droplets have undergone a heat treatment which, in comparison with the prior art, means that the droplets hit the surface to be coated with a higher temperature and thus a lower viscosity or that a larger part of the solvent contained in the spray material o. Like. Has already evaporated upon impact.
  • the arrangement of the outer gas supply line 28 near the front of the head 2 ensures that the parts of the inner gas supply line 26 through which hot gas flows are relatively short, so that the head 2 is heated as little as possible by the gas and therefore also none high temperatures can be transferred to the spray material to be atomized inside the head.
  • the material is continuously in circulation via the feed line 21 and the return line 24, so that overheating cannot take place even in the absence of stagnation.
  • the heat insulation element 3 is provided.
  • the protective shield 48 shields the hand from heat radiation from the supply lines 21 and 28.
  • An example of a spray material which can be applied in this way in an improved manner is a rubber / metal binder, in which dissolved organic polymers and dispersed solids are used in organic solvents. So much solvent must be used for atomization that the coating takes a relatively long time to dry, unless warm gas, in particular air, is used in the manner described above. A shorter evaporation time and improved drying also result when using an aqueous carrier liquid. Further exemplary embodiments relate to customary paints and lacquers which can be atomized with a higher viscosity than previously and nevertheless obtain a well-adhering coating with a smooth surface.
  • the material pressures are between 30 and 300 bar, while air with an overpressure of, for example, 0.5 to 10 bar, preferably 1 to 8 bar , is fed.
  • the air quantities emitted per minute can be, for example, 0.5 to 2 m 3 .
  • the temperature is advantageously between 55 ° and 130 ° C., but preferably above 70 ° C.
  • the illustrated spray device can also be used with minor modification when working with pneumatic atomization by hot gas.
  • an annular gap around the atomizing nozzle 7 can be provided as a gas outlet opening in addition to or instead of the gas outlet openings 9 to 12.
  • the gas and spray material pressures are in the order of magnitude customary for the respective operating mode.
  • the spray material is merely sucked in or supplied with a very slight excess pressure, while the air has an excess pressure of, for example, 2 to 8 bar.
  • the spray device can also work with electrostatic charging.
  • the heated air and / or the spray material can be charged by means of an external electrode.
  • the heating devices are expediently designed to be explosion-proof.
  • an automatic gun can also be used.

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  • Nozzles (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP86100226A 1985-01-17 1986-01-09 Verfahren zum Auftragen von Sprühgut mittels einer Sprühvorrichtung und zugehörige Sprühvorrichtung Expired EP0192028B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86100226T ATE38948T1 (de) 1985-01-17 1986-01-09 Verfahren zum auftragen von spruehgut mittels einer spruehvorrichtung und zugehoerige spruehvorrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853501446 DE3501446A1 (de) 1985-01-17 1985-01-17 Verfahren zum auftragen von spritz- oder spruehgut und vorrichtung zur durchfuehrung des verfahrens
DE3501446 1985-01-17

Publications (2)

Publication Number Publication Date
EP0192028A1 EP0192028A1 (de) 1986-08-27
EP0192028B1 true EP0192028B1 (de) 1988-11-30

Family

ID=6260082

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86100226A Expired EP0192028B1 (de) 1985-01-17 1986-01-09 Verfahren zum Auftragen von Sprühgut mittels einer Sprühvorrichtung und zugehörige Sprühvorrichtung

Country Status (4)

Country Link
EP (1) EP0192028B1 (th)
AT (1) ATE38948T1 (th)
BR (1) BR8600170A (th)
DE (2) DE3501446A1 (th)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5478014A (en) * 1994-04-20 1995-12-26 Hynds; James E. Method and system for hot air spray coating and atomizing device for use therein
US5526981A (en) * 1994-10-31 1996-06-18 Sanson; Bruce A. Adhesive spray system, and methods of constructing and utilizing same
US5669557A (en) * 1994-12-14 1997-09-23 Tram-7 Precision, Inc. System and process for spraying air-dryable liquid materials
US5826795A (en) * 1996-08-19 1998-10-27 Minnesota Mining And Manufacturing Company Spray assembly

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE232306C (th) *
DE2809286C3 (de) * 1978-03-01 1981-09-03 Mannesmann AG, 4000 Düsseldorf Vorrichtung zum Auftragen von flüssigen Korrosionsschutzmitteln auf metallische Oberfläche
US4388353A (en) * 1981-07-22 1983-06-14 Michael Ladney, Jr. Method and apparatus for applying enamels
DE3225844C2 (de) * 1982-07-09 1985-06-20 Sprimag Spritzmaschinenbau Gmbh, 7312 Kirchheim Verfahren und Vorrichtung zum Auftragen von Schichten aus thermoplastischen Kunststoffen

Also Published As

Publication number Publication date
DE3501446A1 (de) 1986-07-17
DE3501446C2 (th) 1987-05-14
BR8600170A (pt) 1986-09-30
DE3661301D1 (en) 1989-01-05
EP0192028A1 (de) 1986-08-27
ATE38948T1 (de) 1988-12-15

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