EP3398689B1 - An apparatus for the powder coating of an object and related opeative method - Google Patents

An apparatus for the powder coating of an object and related opeative method Download PDF

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Publication number
EP3398689B1
EP3398689B1 EP18166440.0A EP18166440A EP3398689B1 EP 3398689 B1 EP3398689 B1 EP 3398689B1 EP 18166440 A EP18166440 A EP 18166440A EP 3398689 B1 EP3398689 B1 EP 3398689B1
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EP
European Patent Office
Prior art keywords
container
powder
cleaning
painting
painting powder
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Application number
EP18166440.0A
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German (de)
English (en)
French (fr)
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EP3398689A1 (en
Inventor
Luigi Carlo Maria Volonte'
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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
    • B05B7/14—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
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1463—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet separate containers for different materials to be sprayed being moved from a first location, e.g. a filling station, where they are fluidically disconnected from the spraying apparatus, to a second location, generally close to the spraying apparatus, where they are fluidically connected to the latter
    • 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
    • B05B7/144—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means
    • B05B7/1445—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means involving vibrations
    • 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
    • B05B7/1463—Arrangements for supplying particulate material the means for supplying particulate material comprising a gas inlet for pressurising or avoiding depressurisation of a powder container

Definitions

  • the present invention concerns the field of powder coating, and in particular a powder coating apparatus able to quickly carry out a color change.
  • painting powder is withdrawn from a source and placed inside a container, where it is sieved and then directed, typically by mixing it with compressed air, to a dedicated delivering device.
  • This delivering device is generally shaped as a gun and adapted to spray painting powder against the objects to be painted. Due to electrostatic effect, the powder adheres to the objects. The objects are then heated in order to melt the painting powder, which then forms a colored layer adhering to the object itself.
  • the painting powder directed to the gun is of a single color.
  • different colors have to be applied on the same object, or when in a plant the object to be colored is changed, there is the need to change the source of the paint, i.e. to change the color of the paint, and all the elements that came into contact with the paint of the previous color have to be cleaned, so as to prevent residues of the previous color from mixing with the painting powder of the new color, thereby causing obviously unwanted effects.
  • color change operations are known in the art as "color change” operations. During these operations, the plant is not working, i.e. no objects are colored. If the color change takes too much time, the plant productivity decreases.
  • US 2009/0232980 discloses a system for coating articles, the system comprising: an applying device which releases the coating material in powder form; a supplying device which supplies the coating material to the applying device.
  • the supplying device is configured in such a way that it is able to transport the pulverulent coating material in a plurality of powder containers including an abrasion-proof material; at that end of the supplying device, which faces towards the applying device, an opening device is provided which is able to open each of the plurality of the powder containers and remove the pulverulent coating material from within and pass it on to the applying device.
  • US 2013/0019970 discloses a powder supply system for supplying powder to a powder spray device comprising a powder supply hopper, a powder fluidizing device for fluidizing powder positioned in the powder supply hopper, and a powder pump for conveying powder from the powder supply hopper to the spray device.
  • the powder supply hopper is pivotally mounted to a support structure.
  • US 2002/0032468 discloses a powder facility used for spray coating and comprising at least one injection unit, at least two powder stations and at least one cleaning unit which are mutually displaceable in program-controlled manner in order to alternatively convey powder from one of the powder receptacles of the powder stations or to clean the powder-flow itineraries using compressed cleaning air.
  • Purpose of this invention is therefore to provide an apparatus and a method for carrying out a color change in short time.
  • an apparatus for the powder coating of an object includes:
  • the alternate movement of the containers between the two positions allows cleaning operations to be carried out on a container, while the other container is operated to feed powder against an object to be painted. Therefore, when carrying out a color change, it is possible to reverse the positions of the two containers, so that the previously used container can be cleaned, and the other previously cleaned container can be used to start the painting operations again. The next time color is changed, these operations are repeated. Therefore, thanks to this solution, a succession of color changes can be carried out in shorter time.
  • the apparatus comprises means to refill the first or second container, which are preferably configured to refill the first or second container when the first or second container is in operative position.
  • the apparatus comprises at least two painting powder stocks, and the refilling means are selectively connectable to the stocks. This further reduces the time required for a color change.
  • the apparatus comprises movement means to move the painting powder stocks.
  • the operations for refilling the containers, as well as the operations for cleaning them, can be automated and therefore the operations of a color change can be automated.
  • At least one of the containers includes:
  • the aforementioned sieving chamber has at least one cavity to allow at least part of the cleaning means to pass through the sieving chamber into the collecting chamber.
  • at least one portion of the cleaning means is configured so as to pass through at least one cavity during the cleaning of the container.
  • An aspect of the present invention further concerns a process for carrying out a color change by means of an apparatus according to one of the above described aspects, the process comprising the steps of:
  • step (f) movement means are operated to move a stock containing painting powder of the second color towards refilling means.
  • the operative position of the first container coincides with the operative position of the second container.
  • the cleaning position of the first container coincides with the cleaning position of the second container. In other words, the two containers are alternated between the same two positions.
  • the cleaning positions and/or the operative positions can be different from each other.
  • the first container can be cleaned in a position different from the position where the second container is cleaned, and/or powder can be withdrawn from the first container at a position different from the position in which powder can be withdrawn from the second container.
  • a powder coating apparatus 1 comprises at least a first container 10 and a second container 20 for the painting powder.
  • the containers 10, 20 can be connected in a known way to paint sources or stocks 2, so as to allow them to be filled with painting powder.
  • the containers 10, 20 are adapted to receive painting powder from sources or stocks 2 and to be connected to dedicated means 3 (better described below) for withdrawing the painting powder and sending it to a device 3c for delivering painting powder on an object to be painted.
  • containers 10, 20 can be used according to the present invention.
  • the containers 10, 20 have the same shape (i.e. they are substantially identical), and in particular the shape described below.
  • the containers 10, 20 have the same shape (i.e. they are substantially identical), and in particular the shape described below.
  • an embodiment of the containers, with particular reference to the first container 10, is now described in detail. However, the following description applies to the second container 20 too.
  • a container 10 for sieving painting powder comprises a sieving chamber 12 and a collecting chamber 13.
  • the container 10 is typically shaped like a bowl, which usually has cylindrical shape. Generally, the container 10 is open at a base.
  • the collecting chamber 13 is at least partially defined by the side walls of the container 11.
  • the collecting chamber 13 has a bottom 13a inserted inside the container 10, which defines the lower surface of the collecting chamber 13, while the side surfaces (or the side surface in this case) of the collecting chamber are defined, as mentioned, by the side walls (or the side wall in this case) of the container 10.
  • the bottom 13a is obtained by means of a porous septum, which allows the passage of air, but prevents the passage of the powder.
  • An air inlet 13b can be arranged below the bottom of the collecting chamber, so that air passes through the porous septum in order to fluidize the sieved powder contained inside the collecting chamber 13.
  • the possibility of having a collecting chamber 13 entirely contained within the container 10 is not excluded.
  • the collecting chamber 13 is typically open on top, so that the means 3 can withdraw the sieved powder from the container 10.
  • the sieving chamber 12 may have different shapes.
  • the sieving chamber preferably defines a substantially enclosed room (with the exception of the inlet/outlet or the inlets/outlets for the painting powder) separated from the collecting chamber 13.
  • the sieving chamber 12 further has at least one external surface 12b, 12c, 12d adapted to define a space or room in which the powder to be sieved can be inserted and in which impurities or anyway elements that did not pass through the sieve 14 (better described below) can be retained.
  • this space or room defined by the sieving chamber 12 is preferably substantially closed (with the exception of the inlet/outlet means of the painting powder), i.e. separated from the room defined by the collecting chamber, so as to prevent the powder to be sieved and contained in the sieving chamber 12 from entering the collecting chamber 13 without passing through the sieve 14.
  • the sieving chamber is partially open, provided that contact between the powder to be sieved and the powder already sieved can be prevented.
  • the shape of the sieving chamber 12 may be similar to that of the collecting chamber, i.e. cylindrical with the upper base open.
  • the sieving chamber preferably has at least one base surface 12b, 12c and at least one side surface 12d.
  • the sieving chamber 12 has cylindrical shape, whereby it is provided with two base surfaces 12b, 12c and one side surface 2d.
  • the sieving chamber 12 is further provided with at least one sieve 14 placed next to at least part of an external surface 12b, 12c, 12d.
  • the sieve 14 is arranged on at least 50%, more preferably at least 75%, of the external surfaces of the sieving chamber.
  • the sieve 14 should cover a percentage as large as possible of the external surfaces of the sieving chamber 2.
  • the sieve 14 covers substantially entirely the external surfaces (or the external surface) 2b, 2c, 2d.
  • the sieve 14 is explicitly shown only in figure 13 , and only on half the sieving chamber 12, in order to allow the other half of the chamber itself to be more simply shown. However it is understood that, in the embodiment shown, the sieve 14 is substantially arranged outside the whole sieving chamber 12.
  • the sieving chamber is formed by a frame 12f on which the sieve 14 is mounted; therefore at least part of the external surfaces 12b, 12c, 12d can consist exclusively of the sieve 14.
  • the sieve 14 typically comprises a wire mesh whose "aperture”, i.e. an average distance between successive mesh wires, is preferably less than or equal to 400 microns.
  • the sieve is typically constrained to the sieving chamber by an anti-vibration support.
  • the sieving chamber 12 has at least one opening 12a to allow powder inlet/outlet.
  • the sieving chamber has an opening 12a which, in normal conditions of use, is used to allow the inlet of powder to be sieved into the chamber.
  • the opening 12a is used to suction the residues held inside the sieving chamber 12 at the end of the sieving operations (e.g. too large powder particles, impurities, etc.).
  • openings can be used, for example openings exclusively dedicated to the inlet of powder, and openings exclusively dedicated to outlet of powder and/or impurities.
  • the sieving chamber 12 has one or more cavities 11 (two cavities 11 in the particular embodiment shown) to allow cleaning means 4 (better described below) to pass in the container 10, and in particular in the collecting chamber 13.
  • the sieving chamber 12 is at least partially, and preferably entirely, arranged inside the collecting chamber 13. Therefore, preferably the sieving chamber 12 is inside the collecting chamber 13 and separate therefrom. As mentioned above, the sieving chamber 12 and the collecting chamber preferably have similar shape. Therefore, according to an aspect the side surface 12d (or the side surfaces in case of polyhedral shape) of the sieving chamber 12 faces the side (inner) surface of the collecting chamber 13.
  • the container remains compact, and the powder sieved by the sieve 14 can be more easily retained inside the collecting chamber 13.
  • the container 10 typically has a support 15 on which the sieving chamber 12 is mounted.
  • the support 15 may have different shapes adapted to bear the collecting chamber 12. In the shown embodiment the support 15 has truncated-cylinder shape. Screws 16, or similar threaded elements, can be used to constrain the sieving chamber 12 to the respective support 15.
  • the container 10 has means 17 to vibrate the sieving chamber 12, or at least the sieve 14.
  • These means 17 may be general means known in the art and suitable for this purpose.
  • vibrating elements 17a, 17b there are vibrating elements 17a, 17b.
  • These vibrating elements 17a, 17b are preferably arranged in combination with anti-vibration supports 17c, which allow the vibration to be transferred to the sieve 14, thus dampening the vibration transmitted to the container 10.
  • anti-vibration supports 17c which allow the vibration to be transferred to the sieve 14, thus dampening the vibration transmitted to the container 10.
  • Different number, arrangement and types of vibrating elements can be used with respect to what has been shown (for example a single vibrating element placed in direct or indirect communication with the sieve 14).
  • the element 17a is an ultrasound vibrating element
  • the element 17b is a pneumatic vibrating element.
  • An air inlet 18 is preferably placed on the container 10 in order to supply air to the pneumatic vibrating element 17b for the optimal operation thereof.
  • the solution described above is preferred for the containers 10, 20, there is the possibility of using different types of containers that are able to receive (and preferably sieve) the painting powder from a stock 2, and to deliver it to the withdrawing means 3 that withdraw the paint itself.
  • the apparatus 1 is further provided with means 5 to move the containers 10, 20 between an operative position P1 and a cleaning position P2.
  • Various movement means 5 to move the containers 10, 20 can be used.
  • the containers 10, 20 are placed on a movable support 5a, which is moved by a motor M (schematically shown only in figure 1 ).
  • the movable support 5a can be for example a rotating platform (as shown for example in the embodiment of figures 1 - 8 ), or an element movable along a path (as shown for example in the embodiments of figures 9A - 11 ).
  • the movement means 5 allow the containers 10, 20 to be moved so that, when the first container 10 is in the operative position P1, the second container is in the cleaning position P2, and so that when the first container 10 is in the cleaning position P2, the second container is in the operative position P1.
  • the "operative position P1" is the position in which the container 10, 20 can be used to withdraw painting powder therefrom and send it to a dedicated delivering device 3c to allow the painting of an object 100.
  • the "cleaning position P2" is the position in which cleaning operations can be carried out on the container 10, 20.
  • the two containers 10, 20 are preferably alternated between the two positions P1, P2.
  • a single operative position P1 is then configured so as to allow painting powder to be alternately withdrawn from the first container 10 and the second container 20.
  • a single cleaning position P2 can be configured so as to alternately clean the first container 10 and the second container 20.
  • the same cleaning means 4 are alternately inserted into the first container 10 and the second container 20.
  • the same withdrawing means 3 are alternately inserted into the first container 10 and the second container 20.
  • the operative position P1' of the first container 10 differs from the operative position P1" of the second container and/or the cleaning position P2' of the first container 10 differs from the cleaning position P2" of the second container 20.
  • different cleaning means 4 and/or different withdrawing means 3 must be provided. This increases the costs of the apparatus 1 but also saves further time in color change operations, as better discussed below.
  • the containers 10, 20 share the same operative position P1, i.e. they are alternately arranged in the same operative position, while the cleaning positions P2', P2" are different from each other, i.e. the cleaning position P2' of the first container is different from the cleaning position P2" of the second container 20.
  • the same withdrawing means 3 are alternately coupled to the first container 10 and the second container 20.
  • First cleaning means 4' can be coupled only to the first container 10
  • second cleaning means 4" can be coupled only to the second container.
  • both operative positions P1 and cleaning positions P2 are different for the two containers 10, 20.
  • first cleaning means 4' can be coupled only to the first container 10
  • second cleaning means 4" can be coupled only to the second container.
  • first withdrawing means 3' can be coupled only to the first container 10
  • second withdrawing means 3" can be coupled only to the second container.
  • the operative position P1' of the first container differs from the operative position P1" of the second container 20
  • the cleaning position P2' of the second container differs from the cleaning position P2" of the second container 20.
  • first withdrawing means 3' couplable only to the first container 10 and second withdrawing means 3" couplable only to the second container can be provided, but single cleaning means 4 are (alternately) couplable to either the first container 10 and the second container 20.
  • the operative position P1' of the first container differs from the operative position P1" of the second container, whereas the cleaning position P2 of the first container 10 coincides with the cleaning position P2 of the second container 20.
  • a possible embodiment providing this solution is schematically shown in figure 11 .
  • the second container when the first container 10 is in the operative position P1, P1', the second container is in the cleaning position P2, P2", and vice versa, so that while a container is used to paint an object 100, the other container is cleaned.
  • the withdrawing means 3 can be of various types known in the art.
  • the withdrawing means comprise a suctioning element 3a that can be inserted into the container 10, 20.
  • a hose 3b, or similar element is connected to a delivering device 3c (typically in the form of a user-operated gun) to deliver painting powder on an object to be painted 100.
  • a delivering device 3c typically in the form of a user-operated gun
  • Proper devices known in the art and not shown in detail are used to allow the suction of the painting powder through the withdrawing means 3.
  • cleaning means 4 can be used with the present invention.
  • these cleaning means comprise both suctioning elements, to allow the suction of the painting powder that may remain in the container 10, 20, and elements adapted to deliver a cleaning fluid at least against the walls of the container 10, 20 (and preferably also of the sieve 14 that may be held in the container 10, 20).
  • the cleaning fluid is air, so the same device can be used alternatively either to suction the residual powder and to feed air to the container 10, 20 in order to clean it.
  • the cleaning means 4 preferably comprise at least one movable arm 4a.
  • the movable arm 4a comprises a typically elongated body 41a and a head 42a laterally protruding with respect to the body 41a.
  • the movable arm has a plurality of nozzles 4b adapted to eject a fluid to clean the container.
  • a fluid typically is air.
  • the cleaning device 4 comprises or is connectable to an air source (known in the art and not shown in the figures), e.g. a compressor.
  • the nozzles 4b are arranged so that the fluid is ejected in several directions. More specifically, each nozzle typically has a main direction of fluid ejection. This direction may be different for different nozzles. In this way, for example, different elements of the container or even different surfaces of the same container can be effectively cleaned.
  • the movable arm 4a is hollow inside in order to facilitate the passage of the air or fluid used for cleaning the container 10.
  • the arm 4a can be moved in various directions according to the needs.
  • the movable arm 4a is rotatable.
  • the cleaning means 4 have a longitudinal A axis typically coinciding, in use, with the longitudinal axis of the container 10, and the movable arm 4a can be rotated around this axis A.
  • the movable arm 4a has a L-shaped body 41a having a first portion substantially orthogonal to the axis A and a second portion substantially parallel to the axis A.
  • Appropriate motorized means can be provided to move the movable arm 4a.
  • the arrangement of the nozzles 4b is such that, when the cleaning fluid is ejected therefrom, the movable arm is naturally rotated.
  • An actuator 43 e.g. an electric or pneumatic one, may also be provided in order to arrange the arm 4a (or arms 4a) in a position such as to allow the device 4 to be removed from the container 10, e.g. a position in which the arm 4a is placed at the cavities 2e.
  • More than one movable arm 4a can be provided on the cleaning means 4.
  • the cleaning means 4 preferably also have a suctioning element 4c that can be inserted into the sieving chamber 12, typically through the opening 2a.
  • this suctioning element 4c is in the form of a tubing connected in a known way to a suctioning element known in the art, which can alternatively be part of the means 4, or an external element specifically connected thereto.
  • the configuration of the cleaning device 4 and container 10 preferably allows the former to be inserted into the latter.
  • the sieving chamber 12 preferably has cavities 11 to allow the cleaning device 4 to be inserted into the container 10.
  • the cavities 11 are complementarily shaped with respect to the heads 42a of the movable arms 4a, so as to allow the heads to pass through the sieving chamber 12, i.e. to go past the sieving chamber when the cleaning device 4 is moved to be inserted into the container 10.
  • Additional devices can be used to suction the contents of the collecting chamber 12 or, before ejecting a cleaning fluid, air can be suctioned by the nozzles 4b, so as to remove the painting powder left in the container 10, 20.
  • the apparatus 1 comprises at least two stocks 2a, 2b that can be used to refill the containers 10, 20 after they have been cleaned.
  • Appropriate refilling means are provided in the apparatus 1 for this purpose. These means, known in the art, are adapted to transfer painting powder from a stock to a container 10, 20.
  • these withdrawing means 3 comprise a source of compressed air (not shown in detail) adapted to allow the powder to be suctioned from the stock 2a, 2b and delivered to the container 10, 20.
  • the stock 2a, 2b with the appropriate color i.e. the painting powder with the color chosen for filling the container 10, 20 can be manually arranged in the apparatus 1 at the withdrawing means 3, so as to allow them to transfer the powder from the stock 2a, 2b to the container 10, 20.
  • the apparatus 1 is provided with movement means 7 adapted to automatically arrange the stock 2a, 2b containing the powder of the desired color near the withdrawing means 3.
  • additional movement means 7 are also known in the art and may include, for example, a rotating and/or translating platform.
  • the apparatus 1 is further provided with a control unit known in the art and not shown in detail, the latter being adapted to control the operations at least of the cleaning means 4, the withdrawing means 3 and the movement means 5.
  • the coupling between the containers 10, 20 and the various devices of the apparatus typically occurs by relative movement between the two elements.
  • This movement can be provided by the movement means 5 (typically by means of a vertical movement thereof) and/or by means of a movement of the devices themselves, i.e. the cleaning means and/or the withdrawing means 3, etc.
  • one or more motors (not shown in the figures) to move the cleaning means 4 and/or the withdrawing means 3 and/or the refilling means 6, etc., are provided. These motors are in turn connected to the control unit, so that the latter can control their activation.
  • the movement means 5 are operated so that the first container 10 comprising painting powder of a first color is arranged in the operative position P1 and the second container 20 is arranged in the cleaning position P2.
  • This condition is depicted, in particular, in Figure 1 .
  • FIG. 2 shows the step of emptying the second container 20
  • figure 3 shows the step of directing a cleaning fluid against the walls of the second container 20.
  • the withdrawing means 3 are disengaged from the first container 10 and the cleaning means are disengaged from the second container 20. This condition is depicted in figure 4 .
  • FIG. 5 shows the movement of the two containers 10, 20 by the means 5.
  • FIG. 5A and 5B the movement is further schematically shown in plan view. The arrangement of figure 6 is obtained at the end of the movement.
  • the refilling means 6 are preferably operated so that the second container 20 is refilled with the painting powder of a second color. This operation can be carried out when the second container is in the cleaning position (typically after the cleaning operations) or when the container is in the operative position, typically before coupling the withdrawing means to the second container 20.
  • movable refilling means 6 may be further provided, i.e. able to follow the second container during its movement between the cleaning position 3 and the operative position, so as to at least partially refill the second container 20 during this movement.
  • the apparatus may also have additional movement means 7 adapted to bring the proper stock 2a, 2b (i.e. the one containing the painting powder of the desired color, i.e. in this case the second color) at the refilling means 6.
  • additional movement means 7 adapted to bring the proper stock 2a, 2b (i.e. the one containing the painting powder of the desired color, i.e. in this case the second color) at the refilling means 6.
  • cleaning operations also carried out also on the withdrawing means 3 and/or cleaning means 4, and in general on the various elements that came into contact with the painting powder of the first color.
  • steps are carried out by devices and methods known in the art and are not describe in detail herein.
  • different cleaning means 4 and/or withdrawing means 3 may be provided, so that non-operative means can be cleaned while coupling the other ones to the containers 10, 20. Similar embodiments are briefly depicted in figures 9A - 11 .
  • the painting operations of an object 100 may be resumed, while the first container 10 is cleaned, as shown in figure 8 .
  • color changes can be sequentially operated, with substantially identical and reduced waiting time for each color change.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP18166440.0A 2017-05-02 2018-04-10 An apparatus for the powder coating of an object and related opeative method Active EP3398689B1 (en)

Applications Claiming Priority (1)

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IT102017000047173A IT201700047173A1 (it) 2017-05-02 2017-05-02 Apparato per la verniciatura a polvere e relativo metodo operativo

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EP3398689A1 EP3398689A1 (en) 2018-11-07
EP3398689B1 true EP3398689B1 (en) 2020-03-18

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ES (1) ES2796554T3 (es)
IT (1) IT201700047173A1 (es)

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DE102004059870B4 (de) * 2004-12-13 2011-06-22 EISENMANN Anlagenbau GmbH & Co. KG, 71032 Verfahren und Anlage zur Beschichtung von Gegenständen
EP2374546A1 (en) * 2010-04-12 2011-10-12 Nordson Corporation Powder supply system and method for colour change in a powder supply system

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Publication number Publication date
IT201700047173A1 (it) 2018-11-02
EP3398689A1 (en) 2018-11-07
ES2796554T3 (es) 2020-11-27

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