Classifications

• • 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
• • 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
  • B05B12/1418—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 for supplying several liquids or other fluent materials in selected proportions to a single spray outlet

Definitions

• the subject of the present invention is a process for producing and applying a multi-component paint by spraying, as well as an installation for implementing this process.
• a multi-component paint consists of a base, generally tinted, hereinafter called base tint, which must be mixed in a precise ratio with at least one hardener before being sprayed by any paint spraying device.
• an installation is designed to make and apply paints of different colors. It is possible in such a case to provide a block for changing colors or shades upstream of the dosing pump. It is then necessary to carry out a complete cleaning, when changing colors, of the entire line between the color changing block and the sprayer.
• the motor-pump unit In order to lose as little product as possible during the color change phases, the motor-pump unit is located as close as possible to the sprayer in an area classified as explosive according to the standards in force, which requires the use of approved equipment. It is also possible to provide a motor-pump unit for each shade.
• the essential drawback of this type of device lies in the number of devices used as well as in the unit cost of each of them. Indeed, as indicated above, there the number of motor-driven pump units and the variators associated with them should be increased.
• multi-component paints are used more and more to the extent that they make it possible to meet environmental protection standards which require reducing solvent discharges and also reducing the energy required for cooking. Indeed, multi-component paints include significantly less solvent than conventional products.
• the installations for producing and applying multi-component paints are distinct from the installations intended for producing and applying conventional paints based on solvents, these installations generally comprising a color changing unit, a device flow control such as a pressure regulator or a positive displacement pump for adjusting the flow and a flow meter.
• Conventional installations of the last type mentioned cannot therefore be immediately reused for the production and application by spraying of multi-component paints.
• the object of the invention is to provide a method and an installation for the production and application by spraying of multi-component paints, which are of reasonable cost, which minimize the times of color change and the quantities of product. of rinsing necessary for cleaning the installation during a change of colors, and which allow the passage under advantageous economic conditions from an installation intended for the production of a conventional one-component paint to an installation intended for the production and the application of a multi-component paint.
• the process for producing and applying a multi-component paint by spraying in an installation comprising a main line at one end of which opens at least one supply conduit of a basic shade and, at the other end of which is mounted a sprayer, this line comprising a flow control device imposing the flow of the product distributed by the sprayer is characterized in that it consists:
• An installation for implementing this process comprising a main line at one end of which opens, by means of a valve, at least one supply conduit of a basic color and at the other end of which is mounted a sprayer, this line comprising a flow control device imposing the flow of the product dispensed by spraying, is characterized in that in this main line opens at least one secondary line at the end of which opens, by the through a valve, at least one hardener supply line, this line being fitted with a pump unit intended for transferring the hardener into the main line, the latter comprising, downstream of the junction point with the line secondary and upstream of the pressure regulator, a flowmeter which, continuously measuring the flow rate of the base color / hardener mixture, controls the motor-pump unit via the re of a frequency converter, so that the hardener flow rate sent by the pump in the main line allows to respect a predetermined volumetric ratio base color / hardener.
• the installation according to the invention is very close to a conventional installation, since it simply comprises the addition of at least one hardener line comprising a motor-pump group controlled by a frequency converter, which joins the base line upstream of the flow meter. It should be noted that unlike the installations which have been described previously and which constitute the state of the art, it is not necessary in this case to provide a metering pump on the main line. and a metering pump on the secondary line, with regulation of these two pumps, since in the present case, the pump which is arranged on the secondary line is controlled from the total flow of mixture which is imposed by the pressure regulator.
• the secondary line is equipped, at its upstream end, with a power supply unit into which several ducts of basic colors open out, through valves.
• the secondary line is equipped, at its upstream end, with a power supply unit into which several hardener supply conduits open through valves.
• the flowmeter mounted on the main line is a toothed wheel flowmeter. This gear wheel flow meter acts like an encoder on the pump motor control means.
• a static mixer is placed on the main line downstream from the flow meter.
• This static mixer can, for example, be in the form of a longitudinal propeller driven in rotation by the flow of product allowing an intimate mixing of the components.
• two interlocking valves are arranged on the main and secondary lines, immediately upstream from their point of convergence.
• the installation is advantageously supplemented by a supply of rinsing product and air allowing the cleaning and drying of the various pipes and of the components of the main line and of the secondary line.
• rinsing product and air allowing the cleaning and drying of the various pipes and of the components of the main line and of the secondary line.
• a source of rinsing product feeds conduits opening through valves at the upstream ends of the main line and the secondary line respectively. It is thus possible to clean the main and secondary lines until the cleaning agent leaves the sprayer. After cleaning, the product should be removed from remaining rinse.
• the installation includes a source of compressed air supplying conduits opening through valves at the upstream ends of the main line and the secondary line respectively.
• the source of rinse aid additionally feeds two conduits leading into two three-way valves mounted on the main line and on the secondary line upstream of the interlocking valves, and allowing the passage of rinsing product alternately with the base color and the hardener respectively.
• This makes it possible to rinse only the pipes comprising mixed product.
• This is made possible by the use of three-way valves making it possible to choose between the product and the rinsing product, arranged a few tens of centimeters from the corresponding engagement valves mounted respectively on the main line and on the secondary line.
• this installation includes an automaton for controlling the various functions of the installation and a control panel forming an interface with the operator and making it possible in particular to select the colors, to regulate the flow rate of product to be sprayed, to adjust, if is not memorized, a basic shade / hardener volume ratio, and to launch a shade change sequence, the different phases of which are managed by the automaton.
• the installation shown in the drawing includes a color change block 2 from which extends a main line consisting of a conduit 3.
• a color change block open a certain number of conduits 4 via valves 5
• the number of conduits 4 capable of producing different basic colors can be multiplied.
• a flow meter 8 with toothed wheels Downstream of the valve 7 is mounted a flow meter 8 with toothed wheels, then a static mixer 9 being for example in the form of a longitudinal propeller, a pressure regulator 10 on the supply of which is mounted a pressure gauge 12, the pressure being controlled by the operator by actuation of a display 13 or manually via a pressure reducer.
• a sprayer 14 which, in the non-use position, can be placed in a rinsing box 15 connected to a product recovery receptacle.
• a secondary line 16 immediately upstream of the flowmeter 8, by means of an engagement valve 17.
• a block 18 for supplying hardener, into which open, via valves 19, conduits 20 capable of bringing different types of hardeners.
• a hardener presence sensor 22 At the outlet of the hardener supply block 18 are mounted a hardener presence sensor 22, then a pump 23 actuated by a motor 24 equipped with a frequency converter 26 making it possible to adjust the speed of rotation of the pump. Downstream of the pump 23 is arranged on the secondary line a three-way valve 25.
• the flow meter is connected to the control 26 of the motor in order to vary, via the frequency converter, the . speed of rotation of the pump, to adapt it to the volume of color-hardener mixture to be produced.
• the display 13 is connected to an automaton 27 which itself acts in particular on the control of the motor 26.
• the installation also includes a source of rinsing product such as a solvent 28 connected by conduits 29, 30 respectively to the color changing block 2 and to the hardener supply unit 18. These two conduits are respectively equipped with valves. 32 and 34.
• the source of rinsing product 28 is also connected respectively by conduits 35 and 36 to the main line 3 and to the secondary line 16 into which it opens at the three-way valves 6 and 25.
• the installation finally comprises a source 37 of compressed air supply supplying, via conduits 38 and 39, respectively the color changing block 32 and the block supplying hardener 18, the conduit 38 opening into the color changing block 2 via a valve 40 and the conduit 39 opening into the block 18 via a three-way valve 42, joining at this level the conduit 30 for supplying this same block with solvent.
• a basic shade supplying the color changing block 2 through an open valve 5 flows in the main line 3 through the valve 6, the valve 7, to the flow meter 8.
• a hardener supplies the block 18 through an open valve 19, this hardener being driven by the pump 23 after detection by the sensor 22.
• the three-way valve 25 ensures the passage of the hardener as does the interlocking valve 17 which is open .
• the hardener then joins the main line 3, to form with the basic shade a mixture, the flow rate of which is measured by the flow meter 8.
• the flow meter supplies the motor-pump group 23, 24, via the motor control which acts on a frequency converter, the speed of rotation of the pump to adapt the flow rate of hardener to the amount of it desired in the mixture.
• the hardener flow delivered by the pump 23 results from the predetermined ratio between base color and hardener.
• the product mixture passes through the static mixer, and the pressure regulator 10 before being distributed by the sprayer 14. If, during operation, the operator modifies the overall product flow, the flow meter will provide the information to the engine control which will consequently modify the speed of rotation of the pump 23.
• the sprayer can be a manual or automatic sprayer mounted at the end of the arm of a robot.
• lines 3 and 16 should be cleaned.
• it is sent rinse aid at the level of the blocks, via the conduits 29 and 30, the valves 32 and 34 supplying the blocks then being open.
• the rinse aid flows in the main line 3 and in the secondary line 16 to the gun 14 which is in the open position, the solvent being discharged into the rinse box 15.
• lines 3 and 16 are dried using compressed air from the compressed air source 37, the air being brought to the level of the color change blocks 2 and hardener supply 18 through the conduits 38, 39, the valves 40 and 34 being open, and the three-way valve 42 being switched to allow the passage of air.
• the three-way valves 6 and 25 are tilted in the position in which they no longer allow the passage of the basic color and a hardener, but of rinsing product.
• the automaton 27 controls the various functions of the installation and the display 13 or control panel forming an interface with the operator makes it possible in particular to select the colors, to regulate the flow rate of sprayed product, to adjust, if there is no is not memorized, a volume ratio of base color / hardener and to launch a sequence of color change whose different phases, in particular of cleaning, are managed automatically.
• the automaton also makes it possible to read the value of the total flow of mixture circulating in the installation.
• the invention brings a great improvement to the existing technique by providing a method and an installation for the production and application by spraying of a two-component paint consisting of a base color and a hardener, allowing the implementation of a traditional installation on which can be grafted a hardener supply line.
• the main line could supply a second sprayer itself equipped with its pressure regulator, or the installation could include several secondary lines of hardeners.

Landscapes

• Nozzles (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Spray Control Apparatus (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=8851118

Family Applications (1)

Country Status (11)

Families Citing this family (6)

Family Cites Families (13)

• 2000
  • 2000-06-08 FR FR0007377A patent/FR2809970B1/fr not_active Expired - Fee Related
• 2001
  • 2001-06-08 KR KR1020027016646A patent/KR20030024687A/ko not_active Application Discontinuation
  • 2001-06-08 EP EP01945384A patent/EP1286784B1/de not_active Expired - Lifetime
  • 2001-06-08 DE DE60136804T patent/DE60136804D1/de not_active Expired - Lifetime
  • 2001-06-08 AU AU2001267617A patent/AU2001267617A1/en not_active Abandoned
  • 2001-06-08 BR BR0111471-9A patent/BR0111471A/pt not_active IP Right Cessation
  • 2001-06-08 AT AT01945384T patent/ATE416037T1/de not_active IP Right Cessation
  • 2001-06-08 US US10/297,904 patent/US20030157262A1/en not_active Abandoned
  • 2001-06-08 JP JP2002501589A patent/JP2003534913A/ja active Pending
  • 2001-06-08 WO PCT/FR2001/001784 patent/WO2001094025A1/fr active Application Filing
  • 2001-06-08 CA CA002411682A patent/CA2411682A1/fr not_active Abandoned

Non-Patent Citations (1)

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