EP3551342B1 - Vorrichtung zur unterbruchlosen beschichtung von dosenzargen und betriebsverfahren - Google Patents

Vorrichtung zur unterbruchlosen beschichtung von dosenzargen und betriebsverfahren Download PDF

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Publication number
EP3551342B1
EP3551342B1 EP18711807.0A EP18711807A EP3551342B1 EP 3551342 B1 EP3551342 B1 EP 3551342B1 EP 18711807 A EP18711807 A EP 18711807A EP 3551342 B1 EP3551342 B1 EP 3551342B1
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EP
European Patent Office
Prior art keywords
container
coating liquid
filling level
intermediary
pressure
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.)
Active
Application number
EP18711807.0A
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German (de)
English (en)
French (fr)
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EP3551342A1 (de
Inventor
Peter Taiana
Pascal GAUCH
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.)
Soudronic AG
Original Assignee
Soudronic AG
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Publication date
Application filed by Soudronic AG filed Critical Soudronic AG
Publication of EP3551342A1 publication Critical patent/EP3551342A1/de
Application granted granted Critical
Publication of EP3551342B1 publication Critical patent/EP3551342B1/de
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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
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0245—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to a moving work of indefinite length, e.g. to a moving web
    • B05C5/025—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to a moving work of indefinite length, e.g. to a moving web only at particular part of the work

Definitions

  • the invention relates to a device for uninterrupted coating of a series of can bodies and a method for uninterrupted operation of the device according to the respective independent claim.
  • Devices for coating can bodies are known. These are, in particular, paint spray systems for the outer seam of can bodies. These systems are used to coat the weld seam of can bodies so that they are protected against corrosion. Such a system is typically arranged in a production line for cans downstream of a welding machine which welds sheet metal shaped as cylinders to form can bodies. Further processing stations can be provided downstream of the paint spray system. In existing systems, the can bodies that come out of the welding machine at high rates are coated in such a way that paint is conveyed from a paint container under pressure to an application nozzle, which sprays the paint in a thin layer onto the surface of the respective can body to be coated.
  • a disadvantage of this solution is that as soon as the paint container is empty, it has to be replaced, which is accompanied by an undesirable interruption in production. If, on the other hand, production is not interrupted, air gets into the conveyor system in the time until a new paint container is ready, which leads to defective coatings on a number of can bodies on the output side. Consequently, in this case there would also be an undesirable output of these can bodies.
  • a method for coating metal parts is disclosed in EP2698445 called.
  • the object of the invention is to provide a device for the uninterrupted coating of can bodies and an operating method which increases the efficiency in the production of can bodies or cans.
  • an intermediate container is provided in the device, which is connected on the input side to the input container by means of the input line and on the output side is connected to the application nozzle by means of an output line.
  • the device further comprises a control unit for controlling the delivery pressure and monitoring a nominal fill level of the intermediate container and for controlling the application pressure.
  • the intermediate container is filled from the input container by means of compressed air from the compressed air source with a delivery pressure up to a target level with coating liquid.
  • a vent valve of the intermediate container is configured in such a way that during the filling process of the intermediate container with coating liquid, air can simultaneously escape from the intermediate container through the vent valve.
  • the application of the coating liquid to the can bodies is started by conveying the coating liquid from the intermediate container to the application nozzle and from there it is applied to the respective can body.
  • a target level of the coating liquid in the intermediate container is monitored in a continuous step by means of at least one level sensor.
  • the coating liquid is conveyed out of the intermediate container to the application nozzle by delivering compressed air from the compressed air source through a compressed air line into the intermediate container.
  • the empty input container is replaced by at least one new input container exchanged while the coating liquid is further conveyed from the intermediate container to the application nozzle.
  • a sixth step the process of filling the intermediate container with coating liquid from the at least one new input container is only continued after it has been established that the new input container is properly connected to the input line.
  • the application of the coating liquid to the can bodies is not interrupted during this.
  • the processes from the third step are repeated until another action requires the process to be stopped, e.g. as soon as all can bodies of a batch have been coated or the device has to be serviced or cleaned.
  • the production of can bodies is made more efficient, since the coating does not have to be interrupted while the input container is being exchanged.
  • this is due in particular to the fact that the coating can be continued during the unavoidable exchange of the input container, in that the coating liquid is provided from the intermediate container for this period. This prevents the device from having to be switched off for the replacement time, which means an interruption in the coating. If the device continues to be operated during the exchange, air is sucked in as with conventional solutions, but it only reaches the intermediate container (buffer container) and not directly to the application nozzle.
  • FIG. 1 shows a schematic view of a device according to the invention for the uninterrupted coating of can bodies.
  • coating liquid includes all liquids that are suitable for a coating, in particular metal coating, in particular clear and colored coating lacquers, in particular solvent-based or water-based lacquers with a viscosity between 12 and 18 s according to DIN 4.
  • lacquers in particular solvent-based or water-based lacquers with a viscosity between 12 and 18 s according to DIN 4.
  • lacquer is used in a non-limiting manner below.
  • application encompasses all possibilities for wetting a surface to be coated, with spraying of the surface being preferred.
  • delivery pressure is to be understood as that pressure which is built up by a corresponding pressure-generating device for conveying the paint at the inlet of the device according to the invention (on the inlet side).
  • An “application pressure” is that pressure which is used at the outlet of the device according to the invention (on the outlet side) to apply the lacquer.
  • nominal pressure The pressure actually prevailing in the device between inlet and outlet can deviate from these two pressure values and is referred to as "nominal pressure”.
  • maximum fill level relates to an upper threshold value for the maximum permissible fill level of the paint in an intermediate container that has yet to be defined.
  • minimum level relates to a lower threshold value for the minimum permissible level of the paint in the intermediate container.
  • target fill level relates to a fill level of the paint in the intermediate container that is desired during normal operation of the device according to the invention.
  • nominal fill level relates to a fill level of the paint in the intermediate container that actually prevails at a measurement time.
  • intended operation relates to that operating state of the device according to the invention in which the nominal fill level of the paint essentially corresponds to the target fill level during the coating.
  • pressure is understood in the present context as a pressure which is higher than atmospheric pressure.
  • the thicker lines indicate the paint-transporting lines. Lines that transport compressed air are not highlighted.
  • the figure shows a schematic view of a device 1 according to the invention for the uninterrupted coating of can bodies, in particular a series of can bodies, with a lacquer.
  • the device 1 can be used to coat a single can body, but a series or endless series of can bodies is assumed for the following exemplary embodiment of the device to explain the advantages of the device 1.
  • the device 1 comprises an input container 2 for the provision of the paint to be applied. It however, several input containers 2 can also be provided (cf. input container shown in dashed lines), which can be filled either with the same paint or with different components of a paint to be mixed.
  • the input container 2 is connected to an intermediate container 5 by means of an input line 8a.
  • a first valve 2a (for example a solenoid valve), by means of which the delivery of paint from the input container 2 can be switched on or off, is arranged in the input line 8a of the input container.
  • the first valve 2a is completely open in normal operation and completely closed during the exchange of input containers 2, which will be explained in more detail below.
  • the device 1 further comprises a compressed air source 3 for supplying compressed air.
  • the compressed air source 3 has several tasks.
  • a first task of the compressed air source 3 is to convey the paint from the input container 2 through the input line 8a into the intermediate container 5.
  • the compressed air source 3 is connected to the input container 2 by means of a line 8d.
  • compressed air flows into the input container 2, e.g. with a delivery pressure of 4 bar, preferably adjustable by means of an input pressure regulator 3b, and the paint is pressed into the input line 8a.
  • the entire device 1 preferably does not include any pumps and the entire conveyance of the paint is carried out by means of compressed air.
  • Another suitable gas can also be used instead of air, but air is preferred for reasons of cost.
  • pumps can also be used instead of or in addition to conveying by means of compressed air, but this is not preferred.
  • a second task of the compressed air source 3 is to support the maintenance of the transport of the paint from the intermediate container 5 to the application nozzle 9 while an empty input container 2 is exchanged for a new input container 2 (cf. fourth step of the method according to the invention).
  • the compressed air source 3 is connected to the intermediate container 5 by means of a compressed air line 8c.
  • a second valve 3a is provided in the compressed air line 8c, by means of which the compressed air supply to the intermediate container 5 can be switched on or off. If it was found that the input container 2 is empty, the valve 2a is closed and the valve 3a is opened. The supply of paint to the intermediate container 5 is thus interrupted and compressed air is pumped into the intermediate container 5. The empty input container 2 can then be exchanged. The determination that the input container 2 is empty can be communicated to the user, for example by means of an acoustic and / or optical signal.
  • the compressed air source 3 is preferably designed in such a way that it maintains an essentially constant delivery pressure during the intended operation of the device.
  • the delivery pressure is selected to be higher than the application pressure, which will be explained in more detail in connection with the application nozzle to be described below. It should be noted that regardless of the fact that the delivery pressure is kept as constant as possible, pressure fluctuations can certainly arise in the further course of the paint-transporting delivery flow, which can arise, for example, due to line losses or ventilation taking place.
  • the compressed air source 3 is designed in such a way that it can compensate for such pressure fluctuations. In other words, in one embodiment of the device according to the invention, the delivery pressure can be adapted on the basis of such circumstances.
  • a filter 4 is preferably connected in the intermediate container 5 or in the input line 8a, which filters any dirt particles that may be present from the paint.
  • the inlet line 8a opens into the intermediate container 5.
  • the opening of the inlet line 8a is arranged in the upper area of the intermediate container 5, the upper area being assumed to be a quarter of the total height of the intermediate container.
  • a vent valve 5a is provided, by means of which air can be let out of the intermediate container 5.
  • a safety distance is maintained between the above-mentioned opening of the inlet line 8a in the intermediate container 5 and the vent valve 5a so that no paint can escape through the vent valve 5a during the venting. This safety distance can be ensured, for example, if, as shown in the figure, the mouth is arranged on the side of the intermediate container 5 and the vent valve 5a is arranged on top of the intermediate container 5.
  • An outlet valve 5b is provided on the underside of the intermediate container 5, which is used to empty the intermediate container 5, which is carried out, for example, in the event that the intermediate container 5 is to be cleaned.
  • the intermediate container 5 is a pressure container which is designed for at least the maximum possible pressure in the device 1.
  • fill level sensors 6a, 6b, 6c e.g. infrared light barrier-based sensors
  • a first fill level sensor 6a is used to detect a maximum level of the paint in the intermediate container 5.
  • a second fill level sensor 6b is used to detect a target fill level of the paint in the intermediate container 5. With others In words, the second fill level sensor 6b detects whether the nominal fill level is above or equal to the target fill level or is below it.
  • a third fill level sensor 6c serves to detect a minimum level of the paint in the intermediate container 5. The task of the individual fill level sensors is explained in more detail below in connection with the operating method according to the invention.
  • a measuring column 6 is provided, which is connected to the intermediate container 5 in a liquid-transporting manner and on or in which the level sensors 6a, 6b, 6c are arranged.
  • the measuring column typically has a diameter many times smaller than the intermediate container 5. The use of the measuring column has the advantage that more buffer time is gained, since it is known earlier when the input container 2 is empty.
  • the intermediate container 5 is connected on the output side to an application nozzle 9 by means of an output line 8b.
  • the application nozzle 9 is used for applying, in particular spraying, the paint with an application pressure of, for example, 2 bar or 2.5 bar onto the can body 1a.
  • the outlet line 8b preferably begins in the lower area of the intermediate container 5, preferably in the lower quarter of the total height of the intermediate container 5, in particular below the minimum fill level of the paint in the intermediate container 5, which ensures that no air can get into the outlet line 8b.
  • the arrangement of the mouth of the input line 8a in the upper area of the intermediate container 5 and the inlet of the output line 8b in the lower area of the intermediate container 5 improves the decoupling of the output line 8b from the input line 8a with regard to the action of air that occurs when the input container 2 is changed can get into the input line. Accordingly, this air is indeed transported through the inlet line 8a into the intermediate container 5, but it remains in the upper region of the intermediate container 5 and can be removed in a simple manner by means of the vent valve 5a be disposed of without it being able to get into the output line 8b.
  • a manually or automatically operable pressure regulator 7 for regulating the application pressure for spraying the paint by means of the application nozzle 9 is provided in the output line 8b.
  • the delivery pressure is selected to be higher than the application pressure, in this example 4 bar or 2 or 2.5 bar. This ensures that, seen from the input side of the device 1, sufficient pressure is built up to ensure the required spray effect of the application nozzle 9, since the pure hydrostatic pressure caused by the paint column in the intermediate container 5 does not meet the requirements for the coating of the Can body 1a is sufficient.
  • the pressure in the intermediate container 5 essentially corresponds to the delivery pressure, here e.g. 4 bar. For reasons of simplification, any pressure losses in the inlet line, etc., are not discussed in this context.
  • One advantage of these pressure ratios is that the application pressure is made controllable from the input side of the device 1, even if, for example, the pressure regulator 7 is not present.
  • an output valve 13 is provided in the output line 8b, by means of which the paint supply to the application nozzle 9 can be switched on or off.
  • the valve 13 typically remains closed until the can bodies 1a arrive for coating, after which the paint supply is switched on.
  • valves 2a, 3a, 5b and the pressure regulator 7 can also be controlled manually.
  • This step can be carried out at any time, preferably periodically at predetermined time intervals, and can therefore overlap with step 1 and / or 2.
  • the target fill level of the paint in the intermediate container 5 is monitored by means of the second fill level sensor 6b.
  • Step 3 Using the continuous step above, determining that the nominal level has fallen below the target level. This can be done by querying the second paint sensor 6b by means of the control unit 11. This determination always takes place at least when the input container 2 is empty. In this case, the paint level in the intermediate container 5 sinks, since paint is still being removed for coating on the output side, but no more paint is supplied to the intermediate container 5 on the input side.
  • the determination that the input container 2 is empty is preferably acknowledged as valid if either the paint does not reach the target fill level during a certain period of time or if the nominal fill level has fallen below the target fill level by a certain factor. If this determination has been acknowledged, then, as already mentioned, an acoustic and / or visual signal can preferably be output.
  • a detection unit can also be provided, by means of which air bubbles in the input line can be detected.
  • Step 4 Maintaining the conveyance of the coating liquid from the intermediate container 5 to the application nozzle 9 by conveying compressed air from the compressed air source 3 through the compressed air line 8c into the intermediate container 5. This is done by opening the second valve 3a. Only then is the first valve 2a closed and the empty inlet container 2 uncoupled.
  • step 4 the delivery pressure in the intermediate container 5 is accordingly maintained. In this way it is ensured that the application nozzle 9, which is still in use while the input container 2 is being exchanged, continues to have sufficient pressure for spraying.
  • Step 5 Replacing the empty input container 2 with at least one new input container 2, while the paint continues to be conveyed from the intermediate container 5 to the application nozzle 9. If several input containers 2 are connected, the exchange can take place in such a way that a switch is made from an empty first input container 2 to a second input container 2. The fill level of the second input container 2 is checked in advance to ensure that it is full. If all input containers 2 are empty, they are exchanged or refilled.
  • Step 6 Continuation of the supply of the intermediate container 5 with coating liquid from the at least one new input container 2. This only takes place after it has been established that the new input container 2 is properly connected to the input line 8a. During this, the application of the coating liquid to the can bodies 1a is not interrupted. The supply of paint to the intermediate container 5 is resumed by opening the first valve 2a again after the second valve 3a has been closed.
  • the application pressure can preferably be set by means of the pressure regulator 7 of the device 1 in such a way that it is lower than the delivery pressure by a prescribed factor.
  • This factor is preferably chosen in the range from 1.5 to 2.
  • the conveyance of the paint from the input container 2 is preferably stopped until the nominal level is reached falls below the maximum level again (close the first valve 2a).
  • This state can be reported to the control unit 11 by the first fill level sensor 6a.
  • the vent valve 5a is open.
  • the air in the intermediate container 5 which ensures that the liquid level cannot rise above a certain level when the device is operated as intended, can escape and be displaced by the rising nominal level of the paint.
  • the vent valve 5a can for example be opened during operation when air bubbles are contained in the paint flowing into the intermediate container 5 and these have to be evacuated from the intermediate container 5.
  • the increase in the nominal level can be limited by closing the vent valve 5a.
  • compressed air can be conveyed from the compressed air source 3 through the compressed air line 8c into the intermediate container 5.
  • a maximum permissible duration of this state of exceeding the maximum fill level can be defined, after which the device is switched off. If the nominal fill level falls below the maximum fill level again during this time, then the transport of paint from the input container 2 can be resumed.
  • the device is preferably switched off when the fill level of the paint in the intermediate container 5 falls below a minimum. In this case, too, a period of time can optionally be defined after which the shutdown is carried out.
  • the present invention enables the interposition of the intermediate container in the conveying line of the paint in a device for coating can bodies that there is no interruption of the coating when the input container is replaced and thus the coating of the can bodies can be carried out more efficiently. Accordingly, the method according to the invention allows the can bodies to be coated continuously without interrupting production every time an input container has to be replaced. This saves costs and makes production more efficient.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
EP18711807.0A 2017-06-21 2018-02-28 Vorrichtung zur unterbruchlosen beschichtung von dosenzargen und betriebsverfahren Active EP3551342B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00813/17A CH713909A1 (de) 2017-06-21 2017-06-21 Vorrichtung zur unterbruchlosen Beschichtung von Dosenzargen und Betriebsverfahren.
PCT/CH2018/000005 WO2018232535A1 (de) 2017-06-21 2018-02-28 Vorrichtung zur unterbruchlosen beschichtung von dosenzargen und betriebsverfahren

Publications (2)

Publication Number Publication Date
EP3551342A1 EP3551342A1 (de) 2019-10-16
EP3551342B1 true EP3551342B1 (de) 2021-07-07

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EP18711807.0A Active EP3551342B1 (de) 2017-06-21 2018-02-28 Vorrichtung zur unterbruchlosen beschichtung von dosenzargen und betriebsverfahren

Country Status (8)

Country Link
US (1) US11628457B2 (zh)
EP (1) EP3551342B1 (zh)
CN (1) CN110382121B (zh)
CH (1) CH713909A1 (zh)
ES (1) ES2882164T3 (zh)
PT (1) PT3551342T (zh)
TW (1) TWI755500B (zh)
WO (1) WO2018232535A1 (zh)

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JP7182571B2 (ja) 2017-06-29 2022-12-02 マシューズ インターナショナル コーポレイション 流体移送システムおよび方法
FR3104480B1 (fr) 2019-12-17 2022-12-30 Cmsi Conception Et Moulage Au Service De Lindustrie Fabrication de pieces en matiere plastique millimetriques a decimetriques, par injection et parachevement

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Also Published As

Publication number Publication date
US20200114380A1 (en) 2020-04-16
EP3551342A1 (de) 2019-10-16
ES2882164T3 (es) 2021-12-01
US11628457B2 (en) 2023-04-18
TW201904671A (zh) 2019-02-01
CN110382121B (zh) 2022-03-08
CN110382121A (zh) 2019-10-25
WO2018232535A1 (de) 2018-12-27
PT3551342T (pt) 2021-08-11
TWI755500B (zh) 2022-02-21
CH713909A1 (de) 2018-12-28

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