EP0305748A2 - Installation de préparation de poudre de revêtement - Google Patents

Installation de préparation de poudre de revêtement Download PDF

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Publication number
EP0305748A2
EP0305748A2 EP88112524A EP88112524A EP0305748A2 EP 0305748 A2 EP0305748 A2 EP 0305748A2 EP 88112524 A EP88112524 A EP 88112524A EP 88112524 A EP88112524 A EP 88112524A EP 0305748 A2 EP0305748 A2 EP 0305748A2
Authority
EP
European Patent Office
Prior art keywords
powder
compressed air
container
moisture content
processing container
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Withdrawn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
EP88112524A
Other languages
German (de)
English (en)
Other versions
EP0305748A3 (fr
Inventor
Peter Steiger
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.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland GmbH
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
Priority claimed from DE19873729728 external-priority patent/DE3729728A1/de
Priority claimed from DE19873729746 external-priority patent/DE3729746A1/de
Priority claimed from DE19873729705 external-priority patent/DE3729705A1/de
Priority claimed from DE19873729714 external-priority patent/DE3729714A1/de
Application filed by Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Publication of EP0305748A2 publication Critical patent/EP0305748A2/fr
Publication of EP0305748A3 publication Critical patent/EP0305748A3/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Withdrawn legal-status Critical Current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
    • 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
    • B05B7/166—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 material to be sprayed being heated in a container
    • 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
    • B05B7/14—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 designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • 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
    • B05B7/14—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 designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1472—Powder extracted from a powder container in a direction substantially opposite to gravity by a suction device dipped into the powder
    • 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
    • B05B7/24—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2489—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device
    • B05B7/2491—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device characterised by the means for producing or supplying the atomising fluid, e.g. air hoses, air pumps, gas containers, compressors, fans, ventilators, their drives
    • 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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for 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
    • 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
    • B05B7/14—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 designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1454—Arrangements for supplying particulate material comprising means for supplying collected oversprayed particulate material

Definitions

  • the invention relates to a powder preparation plant for coating powders, in particular for enamel powder, for spray coating objects, according to the preamble of patent claim 1.
  • Such a powder preparation system for enamel powder for coating objects is known from US Pat. No. 4,500,560. It contains a processing container with a perforated intermediate base, through which air supplied from below flows into the container and keeps enamel powder therein in a fluidized state. Depending on the moisture content of the enamel powder-air mixture in the container, steam is introduced into the container in order to keep the moisture content of the enamel powder at a certain value.
  • a powder preparation plant for enamel powder and for other coating powders according to the preamble of claim 1 is also known from DE-PS 36 02 388. It contains a processing container in which fluidized powder is located. An elongated bell is immersed in the fluidized powder with its end open at the bottom. The bell is airtight, so that a pressure is created in it, by means of which the filling level of fluidized powder inside the bell is lower than outside the bell. A plurality of fluid inlets for supplying steam or water, which is sprayed through the fluid inlets and mixes with the fluidized powder, is located in the bell, so that the fluidized powder takes on moisture from this steam or water.
  • FR-PS 1 347 012 several embodiments of powder coating systems for enamel powder are known.
  • steam for moistening the enamel powder is generated below the object to be coated, while this is sprayed onto the object by a spray device.
  • water is mixed into the spray jet of the enamel powder sprayed by a spray device via spray nozzles.
  • Enamel powder like plastic powder and other powder used for coating, is electrostatically charged so that it flies along electrical field lines to the object to be coated and adheres to it stay.
  • the objects to be coated are normally connected to earth potential.
  • some types of powder, in particular enamel powder have the disadvantage that they cannot be electrostatically charged in such a way that they are attracted sufficiently by an earthed object and adhere to it. Therefore, additives are added to some types of powder.
  • enamel powder particles are coated with silicone. This allows them to be charged more electrostatically.
  • the enamel powder is additionally moistened with water or steam before it is sprayed onto the object.
  • the powder If the powder is too low, it cannot be electrostatically charged sufficiently, which results in poor coating quality and the efficiency of the process is poor because many powder particles do not get onto the object or bounce off the object. If the powder is too moist, the powder no longer adheres sufficiently to the object to be coated.
  • the decisive factor is the electrical conductivity of the powder. The generation of a certain moisture content of the powder thus serves to produce the optimum electrical conductivity of the powder.
  • the object of the invention is to provide a powder preparation system for coating powder, in particular for enamel powder, with which an optimal electrical conductivity of the coating powder can be generated in a short time process.
  • coating powder can be produced in a short time, which has a favorable electrical conductivity for an electrostatic coating. This maintains the powder for a long time, for example for several weeks. In most cases, an air-conditioned spray coating booth is no longer necessary.
  • the coating powder which is set to a certain moisture content, and thus to a certain electrical conductivity, can be fed to a spray device with normal compressed air as the conveying medium and can be electrically charged and sprayed by the latter.
  • compressed air the moisture content of which is regulated, the moisture content of coating powder can still be within very narrow limits be kept constant when the moisture setpoint of the powder is very small.
  • the powder preparation system according to the invention is described below as part of a powder coating system.
  • the powder preparation system to which all the elements described and shown except for a spray device 10 belong, can also be used in powder production, for example in an enamel-producing mill.
  • the application of the invention is not restricted to a specific type of powder.
  • the powder coating system according to the invention shown in FIG. 1 contains a processing container 2, in which coating powder 4, for example enamel powder, is kept in a fluidized state.
  • a powder inlet 6 with a metal separator and a sieving machine 8 serves to supply fresh powder and recovered powder into the processing container 2.
  • the recovered powder is that which was sprayed by a spray device 10, but did not get onto an object to be coated or from it bounced off again.
  • Recovered powder can be put into another container instead of into the processing container 2, for example into a container 114 , from which the spray device 10 is supplied with powder.
  • a compressed gas conditioning device 20 has a compressed air inlet 24 connected to a compressed air source 22 and an outlet 26, via which the compressed air conditioning device 20 emits a conditioned compressed air flow which is adjusted to a specific setpoint value with regard to its moisture content and its temperature and is therefore conditioned to these values.
  • the outlet 26 of the compressed gas conditioning device is connected via a fluid line 28 to an injector 30, in which the conditioned compressed air flow generates a negative pressure according to the Venturi principle.
  • the compressed air source 22 is a conventional compressed air network which delivers compressed air at approximately 25 ° C. and a humidity of 5%.
  • the compressed gas conditioning device 20 contains a compressed air humidifier 44, in which water 46 is located. Compressed air flows from the compressed air source 22 via the compressed air inlet 24 through the water 46 in the compressed air humidifier 44 to its outlet 48.
  • the water 46 in the compressed air humidifier 44 is kept at a higher temperature than the compressed air of the compressed air source 22 by a heater 50 and a thermostat 52, for example to 50 ° C so that the compressed air absorbs a lot of moisture from the water 46.
  • a thermometer 54 indicates the water temperature.
  • the humidified compressed air has, for example, approximately 45 ° C. and a humidity of 90%.
  • This humidified compressed air passes from the outlet 48 via a line 56 to a cooler 58, in which the moist compressed air is cooled to a lower temperature, for example to 25 ° C., and 100% atmospheric humidity.
  • the cooler 58 contains a cooling water circuit 60 through which cooling water flows.
  • the jacket wall 74 of the processing container 2 is surrounded by three electric radiators 75, 76, 77 in the form of heating mats, which are arranged one above the other from the height of the intermediate floor 12 to the height of the powder surface 36.
  • the radiators can be controlled individually.
  • the radiators 75, 76, 77 can be heated by heating water or steam instead of electrically. They serve to heat the fluidized powder 4, in three superimposed heating zones 75/1, 76/1 and 77/1, in order to evaporate water therein if the moisture content of the fluidized enamel powder 4 is too high. Fluctuations in the moisture of the fluidized powder occur in the uppermost heating zone 75/1 due to fresh powder and powder recovered via the powder inlet 6.
  • the fluctuations are weaker.
  • the weakest are the fluctuations in the lowest heating zone 77/1, which is furthest away from the powder inlet 6 and the fluid inlet 34.
  • the powder outlet 14 is located under the lowest heating zone 77/1.
  • powder which has a substantially constant moisture content can be withdrawn continuously or discontinuously via the powder outlet 14.
  • the smallest moisture values can be set precisely and kept constant. By dividing it into several heating zones, less heating energy is required than with a single heater for the entire treatment tank.
  • a temperature measuring device 78 measures the temperature of the fluidized enamel powder in the processing container 2.
  • a moisture measuring device 80 in the processing container 2 measures the moisture content of the enamel powder particles in the fluidized enamel powder 4.
  • a climate controller 86 is activated via control lines 82 and 84.
  • a pressure regulator 88 In the fluid line 28 of the injector 30 there is a pressure regulator 88, which is opened or closed to a greater or lesser extent depending on the actual temperature value and the actual moisture value by the climate regulator 86 and thereby regulates the supply of conditioned compressed air to the fluid inlet 34.
  • the climate regulator 86 regulates the regulator 68 for regulating the cooling water circuit 60 of the cooler 58 as a function of the actual temperature value and the actual moisture value.
  • a pressure gauge 90 is located in the fluid line 28 for pressure display.
  • the height of the powder surface 36 of the fluidized enamel powder 4 is regulated by level controllers 92 and 94, which are arranged one above the other on the processing container 2.
  • the conditioned compressed air flow passes from the outlet 26 of the compressed gas conditioning device 20 via a branch line 96, in which a pressure regulator 98 and a pressure gauge 100 are located, into an intermediate space 102 below the perforated intermediate base 12 and from there through the perforated intermediate base 12 for fluidizing the enamel powder 4 in the powder chamber 104 of the processing container 2.
  • the outlet 26 of the compressed gas conditioning device 20 is also connected via a further branch line 106, which contains a pressure regulator 108 and a pressure gauge 110, to a lower intermediate space 112 of a coating container 114.
  • a further branch line 106 which contains a pressure regulator 108 and a pressure gauge 110
  • the conditioned compressed air flow reaches the powder space 118 of the coating container 114 via a perforated intermediate floor 116 and holds enamel powder 120 in a fluidized state therein.
  • the enamel powder 120 is the powder which has reached the desired moisture setpoint and temperature setpoint in the processing container 2 and has therefore been transferred from the powder outlet 14 via a transfer line 122 into the coating container 114.
  • a powder supply control device 124 is located in the transfer line 122.
  • the powder outlet 14 is located in the intermediate floor 12 and thus at the lowest point in the processing container 2, conditioned enamel powder can be removed from the processing container 2 without impairing quality, while above the powder outlet 14 enamel powder circulates in a recirculation circuit through the conditioned compressed air stream, which is injector 30 is formed with the riser 32 and the fluid inlet 34. Since the powder inlet 6 for fresh enamel powder and recovered enamel powder is above the powder surface 36, this becomes Enamel powder is detected by the recirculation circuit in each case without it affecting the temperature or humidity of the enamel powder removed via the powder outlet 14.
  • the transfer line 122 feeds the conditioned enamel powder via a powder inlet 132 into the coating container 114 from above.
  • a second injector 134 receives conveying air via a control device 136 from the compressed air source 22 via a line 138 and control air via a line 140.
  • the conveying air creates a negative pressure in the injector 134, through which enamel powder 120 is sucked from the coating container 114 into the injector 134 via a suction pipe and from there is fed to the spray device 10 by the conveying air stream.
  • the conditioned compressed air flow at the outlet 26 of the compressed gas conditioning device 20 serves not only for moistening the enamel powder in the recirculation circuit between the injector 30, the inlet opening 33 and the fluid inlet 34, but also as compressed air for fluidizing the enamel powder through the perforated base 12 in the processing container 2 and through the perforated bottom 116 in the coating container 114, one has a very stable system with regard to the desired moisture content and the desired temperature, with which even the smallest moisture values and any temperatures can be set and kept at the set value.
  • FIG. 2 shows a further embodiment of a compressed gas conditioning device 20/2 according to the invention, which comprises all elements of the compressed gas conditioning device 20 from FIG. 1 and additionally a cooler 150 operated with refrigerant instead of water and a heating device 152 for compressed air reheating.
  • the refrigerant cooler 150 is arranged downstream of the cooling water cooler 58 in the flow direction of the compressed air flow.
  • the heating device 152 is arranged in the flow path of the compressed air flow downstream of the coolant cooler 150 in the line 64 immediately upstream of the outlet 26.
  • the centrifugal separator 66 is located in the flow path of the compressed air flow between the coolant cooler 150 and the heating device 152 in a connecting line 154 between these two elements.
  • a thermometer 156 in the connecting line 154 indicates the respective temperature of the compressed air flow.
  • a refrigerant compressor 160 and a controller 162 are located in the refrigerant circuit 158 of the refrigerant cooler 150.
  • the refrigerant cooler 150 is used to cool the compressed air flow to a temperature below 25 ° C.
  • the cooling water cooler 58 which is arranged upstream thereof, serves to cool the compressed air stream below a temperature which is above 25 ° C.
  • the heating device 152 contains a heating circuit 164 with a temperature controller 166.
  • the heating circuit 164 is supplied with heated compressed air by a pump 168 from the compressed air humidifier 44.
  • a pressure gauge 170 indicates the pressure in the heating circuit 164.
  • the output 48 of the compressed air humidifier 44 is connected to the compressed air inlet 24 via a feedback fluid line 172. This results in better stabilization in the regulation of the compressed air flow.
  • compressed air saturated with water can be set in a range which is at least from 3 ° C to 60 ° C. Subsequent heating with the heater 152 allows the water content in the compressed air flow to be finely regulated.
  • the temperature of the compressed air stream which reaches the processing tank 2 should always be 10 ° above the temperature of the compressed air of the compressed air source 22.
  • compressed air of the compressed gas source 22 can be conditioned with regard to temperature and moisture content with the compressed gas conditioning devices 20 from FIGS. 1 and 20/2 from FIG. 2.
  • "Conditioned” here means the setting and maintenance by appropriate regulation of a desired temperature and a desired moisture content of the compressed air flow.
  • 3 shows the water vapor saturation limits of compressed air, that is to say the water content in g / kg of dry air, as a function of the temperature in ° C. The water content is given in g / kg dry air on the x-axis and the temperature in ° C on the y-axis.
  • FIG. 4 The further embodiment of a powder coating system for enamel powder according to the invention shown in FIG. 4 contains a processing container 402 with a perforated intermediate floor 404 which divides the container interior into a powder space 406 and a compressed air space 408 located underneath.
  • Fresh enamel powder and enamel powder recovered from a coating booth pass through a powder inlet 6, in which there is a metal separator and a sieving device 8, through a lid 410 into the center of the powder space 406.
  • a compressed air conditioning device 412 is connected to the compressed air space 408, from the outlet 414 of which compressed air flow conditioned in terms of temperature and humidity Compressed air space 408 flows and from there through perforated intermediate floor 404 into powder space 406, where the compressed air flow keeps powder 416 in a fluidized state.
  • the compressed gas conditioning device 412 is a compressed air water atomizer, to which water is supplied via a water line 418 and air via a gas line 420 to a compressed air source 22.
  • the compressed air flow from the gas line 420 atomizes the water from the water line 418 and thereby absorbs a certain percentage of water moisture.
  • a sensor 422 measures the moisture content and the temperature of the enamel powder particles in the processing container 402 and regulates the temperature and the moisture content of the compressed air flow in the compressed gas conditioning device 412 as a function thereof.
  • the processing container 402 is provided with two radiators 426 and 428 arranged one above the other in the form of electrical heating mats Provide container wall 430 with which the lower half as heating zone 428/1 and the upper half as heating zone 426/1 of powder chamber 406 can be heated separately from one another.
  • enamel powder can be removed in the lower half of the powder space 406 via a transfer line 122 with a pump 124, which has been conditioned in terms of moisture content and temperature in the processing container 402, while the enamel powder in the upper half of the powder space 406 does not yet have the required setpoints in terms of moisture content and Temperature.
  • the temperature fluctuations and moisture content fluctuations in the upper half of the powder space 406 are considerably larger than in the lower half, because fresh enamel powder is continuously or discontinuously in the upper half and recovered enamel powder is fed.
  • the height of the powder surface 36 in the processing container 402 is regulated by level regulators 92 and 94 provided on it.
  • the transfer line 122 connects a powder outlet 14 of the processing container 402 to a central powder inlet 132 of a coating container 114.
  • the coating container 114 has a perforated intermediate floor 116 which separates a compressed air space 112 from the powder space 118 of the coating container 114 lying above it.
  • a control device 136 is connected to the compressed air source 22 and feeds compressed air via a compressed air line 432 into the compressed air space 412, from which it passes through the perforated intermediate floor 116 into the powder space 118 and fluidizes the powder there.
  • the powder height in the powder container 114 is regulated by a control device 125, which controls the pump 124 as a function of signals from level controllers 128 and 130.
  • An injector 134 is flowed through via a fluid line 138 with conveying air from the compressed air source 22, so that a negative pressure is generated in the injector 134 according to the Venturi principle.
  • the vacuum draws powder from the coating container 114 via a suction line 142 and conveys it to a spray device 10, where the powder is sprayed electrostatically.
  • control air can be supplied to it from the compressed air source 22 via a fluid line 140 and the control device 136.
  • FIG. 5 shows yet another embodiment of a powder coating installation according to the invention for enamel powder. It contains a processing container 502 with a perforated intermediate floor 504, which defines the interior divided into a powder space 506 and a compressed air space 508 located below. Compressed air flowing from a compressed air source 510 into the pressure chamber 508 passes through the perforated intermediate floor 504 into the powder chamber 506 and fluidizes powder 512 there. The height of the surface 36 of the powder 512 is regulated by level regulators 92 and 94. A groove-shaped bell 520 with its open end 522 pointing downward is immersed in the powder 512.
  • the bell 520 is airtight so that there is an overpressure by which powder is displaced from it, so that the surface 536 inside the bell 520 is lower than the surface 36 of the powder outside the bell, and results in the bell a bell cavity 524.
  • a tube 526 with a plurality of nozzles 528 extends through the bell 520.
  • a compressed air conditioning device 20/2 of FIG. 2 is connected to the tube 526 outside the processing container 502, from which compressed air conditioned with respect to moisture content and temperature is connected via the Nozzles 528 is sprayed into the bell chamber 524.
  • the moist compressed air reaches the fluidized powder 512 via the lower opening 522 of the bell 520, wherein it is distributed in the powder 512 in finely adjustable amounts essentially over the entire cross-section of the container.
  • Condensed water in line 526 can flow out through an outlet 536. Similar to FIG. 1, a moisture measuring device 80 and a temperature measuring device 78 are provided, depending on which the moisture content and the temperature of the conditioned compressed air flow in the line 526 is regulated via a control unit 126 and a climate controller 86, and also the powder transfer from the processing tank 502 via a transfer line 122 and one therein arranged pump 124 is controlled.
  • the transfer line 122 transfers powder from the processing container 502 into a coating container 114.
  • the coating container 114, an injector 134 and a spray device 10 for the electrostatic coating of objects are designed and arranged in the same way as the corresponding parts of FIG. 1 provided with the same reference numbers and 4, which is why these parts are not described again in detail here. 4, the preparation container 502 of FIG. 5 is provided with two radiators 426 and 428 arranged one above the other for zone-by-zone moisture regulation of the enamel powder in heating zones 426/1 and 428/1 of the preparation container 502.
  • dry powder is to be understood as meaning powder which has a dry content which is achieved when powder is heated for approximately 10 hours in an open vessel at a temperature of at least 100 ° C., preferably at a temperature of about 120 ° C.

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Accessories For Mixers (AREA)
  • Coating Apparatus (AREA)
  • Nozzles (AREA)
EP88112524A 1987-09-04 1988-08-02 Installation de préparation de poudre de revêtement Withdrawn EP0305748A3 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
DE19873729728 DE3729728A1 (de) 1987-09-04 1987-09-04 Pulveraufbereitungsanlage, fuer beschichtungspulver
DE3729705 1987-09-04
DE19873729746 DE3729746A1 (de) 1987-09-04 1987-09-04 Pulverbeschichtungsverfahren
DE3729714 1987-09-04
DE19873729705 DE3729705A1 (de) 1987-09-04 1987-09-04 Pulverbeschichtungsanlage, insbesondere fuer emailpulver
DE3729746 1987-09-04
DE3729728 1987-09-04
DE19873729714 DE3729714A1 (de) 1987-09-04 1987-09-04 Pulveraufbereitungsanlage fuer beschichtungspulver

Publications (2)

Publication Number Publication Date
EP0305748A2 true EP0305748A2 (fr) 1989-03-08
EP0305748A3 EP0305748A3 (fr) 1990-05-02

Family

ID=27434010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88112524A Withdrawn EP0305748A3 (fr) 1987-09-04 1988-08-02 Installation de préparation de poudre de revêtement

Country Status (3)

Country Link
US (1) US5000624A (fr)
EP (1) EP0305748A3 (fr)
JP (1) JPH0194934A (fr)

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DE9413836U1 (de) * 1994-08-26 1995-07-13 Rombold & Gfröhrer GmbH & Co. KG, 71254 Ditzingen Anlage zum Spritzen von Trockenbaustoffen
EP0675763A1 (fr) * 1993-10-22 1995-10-11 Wagner Systems Inc. Appareil de peinture electrostatique au pistolet
DE19840502C1 (de) * 1998-09-07 2000-03-02 Waeschle Gmbh Verfahren zur pneumatischen Förderung von Schüttgütern
EP3401019A1 (fr) * 2017-05-09 2018-11-14 Herbert Hauptkorn Dispositif d'humidification d'air comprimé
WO2019020796A3 (fr) * 2017-07-28 2019-03-21 Thomas Mayer Dispositif pour utiliser un gaz sous pression sur un dispositif de pulvérisation fonctionnant avec un gaz sous pression, procédé pour utiliser un gaz sous pression sur un dispositif de pulvérisation fonctionnant avec un gaz sous pression ainsi que procédé pour la pulvérisation d'un milieu liquide

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US5248222A (en) * 1991-10-15 1993-09-28 Howard Littman Automatic particle transport system
US5620669A (en) * 1995-08-15 1997-04-15 W. L. Gore & Associates, Inc. Catalytic filter material and method of making same
JP3328555B2 (ja) 1997-08-19 2002-09-24 株式会社日清製粉グループ本社 微粉体の帯電量制御方法および装置ならびに微粉体の散布方法および装置
US5850976A (en) * 1997-10-23 1998-12-22 The Eastwood Company Powder coating application gun and method for using the same
US6402500B1 (en) * 1997-11-06 2002-06-11 Matsys Fluidized fillshoe system
US6485284B1 (en) 1997-11-06 2002-11-26 Matsys Gas assisted flow tube and filling device
US6058622A (en) * 1998-10-19 2000-05-09 Amsted Industries Incorporated Wetting of a powdery material such as a baghouse dust
US6499361B1 (en) 2000-02-18 2002-12-31 Alkermes Controlled Therapeutics, Inc. Method and apparatus for uniform sorbate equilibration of solid samples
US20040022589A1 (en) * 2002-07-31 2004-02-05 Matsys Fluidizer for a substance
US7856737B2 (en) * 2007-08-28 2010-12-28 Mathews Company Apparatus and method for reducing a moisture content of an agricultural product
US9139912B2 (en) * 2008-07-24 2015-09-22 Ok Ryul Kim Apparatus and method for continuous powder coating
EP2671633A1 (fr) * 2012-06-06 2013-12-11 Basf Se Procédé de transport de particules de polymère thermoplastiques moussées
US11130148B2 (en) * 2013-05-29 2021-09-28 Hisamitsu Pharmaceutical Co., Inc. System for manufacturing microneedle preparation, and air-conditioning method
US11745429B2 (en) 2018-04-25 2023-09-05 Hewlett-Packard Development Company, L.P. Humidification in a build material recovery system
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US5000624A (en) 1991-03-19
JPH0194934A (ja) 1989-04-13
EP0305748A3 (fr) 1990-05-02

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