EP3725421A1 - Anlage zum auftragen eines beschichtungsmittels und reinigungsverfahren einer solchen anlage - Google Patents

Anlage zum auftragen eines beschichtungsmittels und reinigungsverfahren einer solchen anlage Download PDF

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Publication number
EP3725421A1
EP3725421A1 EP20169268.8A EP20169268A EP3725421A1 EP 3725421 A1 EP3725421 A1 EP 3725421A1 EP 20169268 A EP20169268 A EP 20169268A EP 3725421 A1 EP3725421 A1 EP 3725421A1
Authority
EP
European Patent Office
Prior art keywords
nozzles
printing
cleaning
assembly
nozzle
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.)
Granted
Application number
EP20169268.8A
Other languages
English (en)
French (fr)
Other versions
EP3725421B1 (de
Inventor
Philippe Provenaz
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.)
Exel Industries SA
Original Assignee
Exel Industries SA
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Filing date
Publication date
Application filed by Exel Industries SA filed Critical Exel Industries SA
Publication of EP3725421A1 publication Critical patent/EP3725421A1/de
Application granted granted Critical
Publication of EP3725421B1 publication Critical patent/EP3725421B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B05B15/555—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids discharged by cleaning nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14008—Structure of acoustic ink jet print heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/16—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening having selectively- effective outlets
    • 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
    • B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
    • B05B12/04—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery for sequential operation or multiple outlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/52—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles
    • B05B15/531—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles using backflow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/1652—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/16552—Cleaning of print head nozzles using cleaning fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16585—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles for paper-width or non-reciprocating print heads
    • B41J2/16588—Print heads movable towards the cleaning unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0447—Installation or apparatus for applying liquid or other fluent material to conveyed separate articles
    • B05B13/0452—Installation or apparatus for applying liquid or other fluent material to conveyed separate articles the conveyed articles being vehicle bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/58—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter preventing deposits, drying-out or blockage by recirculating the fluid to be sprayed from upstream of the discharge opening back to the supplying means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/90—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14475—Structure thereof only for on-demand ink jet heads characterised by nozzle shapes or number of orifices per chamber

Definitions

  • the present invention relates to an installation for applying a coating product comprising a set of nozzles each comprising an outlet channel opening downstream through a coating product ejection orifice.
  • the same applicator which generally comprises several nozzles, is generally used to apply paints of different colors, which involves cleaning each nozzle during a change of coating product, ie. that is, when changing color.
  • the invention more particularly intends to remedy by proposing a new installation for applying a coating product which comprises printing nozzles and which can be easily cleaned.
  • the invention relates to an installation for applying a coating product comprising a set of printing nozzles each comprising an outlet channel opening downstream through a coating product ejection orifice.
  • the installation further comprises several injectors provided to simultaneously clean several nozzles of a row of nozzles or all the nozzles of the set of nozzles, by injecting cleaning fluid into the outlet channels. printing nozzles of the row or set of nozzles, through their ejection orifices.
  • simultaneous cleaning of the downstream part of several printing nozzles can be carried out in the opposite direction to the direction. normal flow of coating material through each nozzle, defined as the direction of flow of coating material during application.
  • This cleaning is particularly efficient and consumes little time, insofar as it can be simultaneous for a large number of nozzles of the set of printing nozzles, for example for all the nozzles of a row of nozzles in the case of a matrix arrangement of the nozzles.
  • the method of the invention comprises at least one additional step consisting in: b) directing a flow of cleaning fluid towards a front face of each printing nozzle, on which the ejection orifice of the printing nozzle is formed.
  • an additional step can be provided which consists in: c) inject into each printing nozzle a cleaning fluid in a direction from a supply duct, which is part of the assembly of printing nozzles, to the ejection orifice, passing through the output channel.
  • Installation I shown in figures 1 to 3 is intended for the application of paint on objects O moved by a conveyor 2 to which the objects O are suspended by hooks 4.
  • the objects O are generally flat panels. As a variant, they may be parts of a motor vehicle body or of complete motor vehicle bodies moved by a stop-and-go or continuous advance type conveyor.
  • the installation I comprises a set of nozzles 10 which is mounted at the end of the arm 22 of a multi-axis robot 20 placed in the vicinity of the conveyor 2.
  • the nozzle assembly 10 comprises eight nozzles 12 arranged in a row and which each protrude from a front face 14 of the nozzle assembly, which front face is directed towards an object to be painted O when the nozzles 12 are used for apply paint.
  • each nozzle 12 belongs to a printing head 13 which further comprises a control member 132, for example of the piezoelectric component type, and a rod 134.
  • Each nozzle 12 comprises a needle 122, controlled by the control member 132 of the print head 13 to which the nozzle belongs and connected to it by the rod 134.
  • the paint to be applied flows into a channel 16, formed in a body 11 of the set of nozzles 10, and circulates in the direction of the arrows F2 at the figure 2 .
  • the nozzle assembly 10 is equipped with a supply valve 102, a purge valve 104 and a recirculation valve 106.
  • the purge valve 304 is provided to control discharging cleaning fluid to a manifold, not shown, after use during a cleaning sequence.
  • the valves 102, 104 and 106 are shown outside the body 11. In practice, they can be integrated into this body, which explains why they are not visible at the figure 1 .
  • 121 denotes the part of a nozzle 12 which protrudes from the surface 14.
  • a seat 125 is provided against which the needle 122 of the nozzle selectively bears, being controlled by the component 132.
  • An outlet channel 126 is formed in each nozzle 12, downstream of its needle 122. This outlet channel 126 opens outwards, opposite the needle 122, through an ejection orifice 127 formed in a front face 128 of the nozzle 12, more precisely in the front face 128 of its part 121.
  • nozzles 12 which are advantageously identical to each other, provided that they include an outlet channel 126 and an ejection orifice 127.
  • the installation I also comprises a cleaning station 30 which is supplied with cleaning fluid by a pipe 40, connected to the station 30 by means of a connector 42 which constitutes the downstream end of the pipe 40.
  • the cleaning station 30 is located in the booth where the paint application takes place, in an area reachable by the multi-axis robot 20.
  • the cleaning station 30 comprises a body 31 in which eight housings 32 are arranged in a row and configured to each receive, partially or entirely, the part 121 of a nozzle 12.
  • a groove 322 is provided, in which is housed a seal 34 which is preferably of the O-ring type and made of elastomer.
  • Channels 36 are formed in the body 31 and allow the cleaning fluid coming from the pipe 40 to be conveyed into each of the housings 32. More precisely, the set of channels 36 opens into each housing 32 via an injector 38, advantageously formed. by a channel of diameter d38 smaller than that of the channels 36. This makes it possible to distribute the cleaning fluid flow rates in an identical manner to the various injectors 38, by providing progressive pressure drops on the flow paths of this fluid in the channels 36, which avoids preferential flow paths.
  • the cleaning station 30 is equipped with a supply valve 302 and a purge valve 304.
  • the purge valve 304 is provided to control the discharge of cleaning fluid to a manifold, not shown, after use during a cleaning sequence.
  • the valves 302 and 304 are shown outside the body 31. In practice, they can be integrated into this body, which explains why they are not visible at the figure 1 .
  • the cleaning fluid passing through the pipe 40, the channels 36 and the injectors 38 can be a cleaning liquid, solvent-based or water-soluble depending on the nature of the paint applied with the nozzles 12, or a gas, in particular air. , or a mixture of liquid and gas.
  • Each housing 32 opens onto the upper face 33 of the station 30 via a chamfer 324, which contributes to guiding the parts 121 during their simultaneous introduction into the housings 32, as emerges from the explanations which follow.
  • the nozzle assembly 10 When applying paint to the objects O, the nozzle assembly 10 is directed towards one of these objects and the nozzles 12 are supplied with coating material through the channels 16.
  • the supply valves 102 and recirculation valve 106 are open, while the purge valve 104 is closed.
  • Each needle 122 can be individually controlled by the associated component 132 of the print head 13, to be selectively moved away from the corresponding seat 125. This makes it possible to supply or not the outlet channel 126 of each nozzle 12 with paint.
  • the paint flows in the direction of the arrows F3 at the figure 2 and emerges from the corresponding nozzle 12 via its ejection orifice 127, in the direction of the object O being coated.
  • the arrows F3 therefore represent the normal flow direction of the paint being applied to an object O.
  • the set of nozzles 10 is moved by the multi-axis robot 20, for the pre -position above the cleaning station 30, with the front face 14 above, and parallel with, the upper face 33, as shown by arrow F4 at the figure 1
  • the set of nozzles 10 is brought into sealed abutment against the cleaning station 30, by introducing each part 121 of a nozzle 12 into a housing 32, in the direction of arrow F5 at the bottom. figure 2 .
  • the geometry of the parts 121, on the one hand, and of the orifices 32, on the other hand, is such that, at the end of the movement according to the arrow F5, the ejection orifice 127 of each nozzle 12 is aligned with an injector 38 from station 30.
  • the nozzles 12 engaged in the housings 32 are thus cleaned simultaneously.
  • the cleaning fluid which enters each outlet duct 126 can go up to the needle 122 and to the seat 125 of the nozzle which it also cleans. This reverse flow in the nozzles 12 is possible because the purge valve 104 is open, while the supply 102 and recirculation 106 valves are closed.
  • each ejection orifice 127 and each front surface 128 are individually isolated from the outside by a seal 34.
  • the injectors 38 constitute both members for cleaning the internal part of the nozzles 12, formed by the needles 122, the seats 125 and the channels 126, and members for cleaning the front faces 128 of the nozzles.
  • the O-ring 34 is disposed in a groove 32 formed not at the junction between the bottom and the side of the housing 32, but in the bottom 326 of this housing, so that the gasket 34 fluidly isolates a smaller portion of the front face 128 of the nozzle 12, the portion 121 of which is disposed in the housing 32.
  • the set of nozzles 10 comprises three rows of eight nozzles 12, the front faces 128 of which are flush with the front face 14 of the set of nozzles 10.
  • the ejection orifices 127 of the various nozzles 12 are thus distributed over the face before 14.
  • Each nozzle 12 belongs to a print head, not shown, which is of the type of the print head 13 of the first embodiment.
  • the cleaning station 30 is also supplied by a pipe 40 and its downstream connection 42 and comprises twenty-four injectors 38 distributed in three rows of eight injectors.
  • the different injectors 38 open directly into the upper face 33 of the body 31 of the station 30.
  • no housing is provided comparable to the housings 32 of the first and second embodiments. .
  • each injector 38 which is located in the surface 33, is surrounded by a groove 332 formed in the upper face 33 of the body 31 and in which is disposed an O-ring 34.
  • the depth of the groove 332 and the toroid diameter of the seal 34 are chosen such that, when it is in place in the groove 332, the O-ring 34 protrudes from the groove 382 over a height h34 of between 0.1 and 0.5 mm.
  • each ejection orifice 127 and each front surface 128 are individually isolated from the outside by a seal 34.
  • supply, purge and recirculation valves are provided, as in the first embodiment.
  • the diameter d38 of the injectors 38 is matched to the diameter d126 of the outlet channels 126 and to the diameter d127 of the ejection orifices 127.
  • the diameters d126 and d127 may be equal.
  • these diameters are between 50 ⁇ m and 300 ⁇ m, preferably between 100 ⁇ m and 200 ⁇ m, more preferably of the order of 150 ⁇ m.
  • the diameter d38 of the injectors 38 may be between 0.5 mm and 2 mm, preferably of the order of 1 mm.
  • the d126 / d38 ratio and / or the d127 / d38 ratio is between 0.03 and 0.5, preferably between 0.05 and 0.2.
  • the invention is described above in the case where the product applied using nozzles 12 is paint.
  • Other coating products can be applied with an installation in accordance with the invention, in particular a primer or a varnish.
  • the invention is described above in the case where the nozzle assembly 10 approaches the cleaning station 30 from above.
  • this docking can take place via one side of the cleaning station, in which case the housings 32 or the outlets 382 of the injectors 38 are provided not in the upper face 33 of the body 31 but in a lateral face of this body.
  • the cleaning station 30 can be manufactured by three-dimensional printing, which makes it possible to adapt the distribution and the routing of the channels 36 and of the injectors 38 inside the body of this cleaning station, without the need for a slide mold or complex machining schedules. However, it remains possible to manufacture the cleaning station by molding and / or machining.
  • the number of rows of printing nozzles 12 can be chosen, greater than or equal to one, as a function of the size of the surface to be coated with each object O, the number of rows of injectors 38 being adapted accordingly.
  • the distance between two printing nozzles 12 within a row of printing nozzles and e38 is denoted by the distance between two injectors 38 within a row of injectors. Whatever the embodiment, these spacings e12 and e38 are chosen to be identical within two rows of nozzles and injectors intended to cooperate together.
  • a cleaning fluid is injected into each printing nozzle in the normal direction of flow of the coating product, that is to say in a direction going from the supply channel 16 to the ejection orifice 127 passing through the outlet channel 126, which amounts to injecting the cleaning fluid in the direction of arrows F3 at the figure 2 .
  • the cleaning fluid is injected into the channel 16 upstream of the supply valve 102, the supply valve 102, the purge valve 104 and the purge valve 304 are opened, while the recirculation valve 106 and the supply valve 302 are closed.
  • the cleaning of the injection nozzles 12 takes place successively in both directions, namely in the direction of the arrows F6, with the valves 302 and 104 open and the other valves closed. , and in the direction of arrows F3, with the valves 102, 104 and 304 open and the other valves closed.
  • the addition of the purge valves 104 and 304 makes it possible to collect the cleaning fluid after use of the latter to clean one or more nozzles 12, without risk of polluting the coating product or the fluid. cleaning device not yet used.
  • the invention is shown in the figures in the case where all the nozzles 12 of the set 10 of nozzles are cleaned simultaneously. However, this is not compulsory.
  • the nozzles can be cleaned in groups, for example row by row in the case of an assembly 10 with several rows of nozzles.
  • the distribution of the injectors 38 of the cleaning station 30 is adapted, as well as the distribution of the seals 34 and that of the channels 36.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Nozzles (AREA)
  • Spray Control Apparatus (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP20169268.8A 2019-04-15 2020-04-14 Anlage zum auftragen eines beschichtungsmittels und reinigungsverfahren einer solchen anlage Active EP3725421B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1903999A FR3094899B1 (fr) 2019-04-15 2019-04-15 Installation d’application de produit de revêtement et procédé de nettoyage d’une telle installation

Publications (2)

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FR3134341A1 (fr) 2022-04-11 2023-10-13 Exel Industries Tête d’impression comprenant un circuit de maintenance et installation de revêtement

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JP2024099918A (ja) * 2023-01-13 2024-07-26 株式会社リコー 塗装システムおよびヘッド洗浄方法

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WO2018108568A1 (de) 2016-12-14 2018-06-21 Dürr Systems Ag Beschichtungseinrichtung und entsprechendes beschichtungsverfahren
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WO2021121965A1 (de) * 2019-12-20 2021-06-24 Dürr Systems Ag Reinigungsvorrichtung zum reinigen eines düsenapplikators und entsprechendes reinigungsverfahren
FR3134341A1 (fr) 2022-04-11 2023-10-13 Exel Industries Tête d’impression comprenant un circuit de maintenance et installation de revêtement
EP4261042A1 (de) 2022-04-11 2023-10-18 Exel Industries Druckkopf mit wartungsschaltung und beschichtungsanlage

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CN111823718A (zh) 2020-10-27
ES2913877T3 (es) 2022-06-06
EP3725421B1 (de) 2022-04-13
RU2020113057A (ru) 2021-10-08
CN111823718B (zh) 2023-06-02
FR3094899A1 (fr) 2020-10-16
JP2020182933A (ja) 2020-11-12
FR3094899B1 (fr) 2022-10-07
US11331921B2 (en) 2022-05-17
US20200324549A1 (en) 2020-10-15
KR20200121244A (ko) 2020-10-23

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