JP2021194572A - Coating method and coating system - Google Patents

Abstract

To provide a coating method which keeps floating of a coating composition using acoustic oscillation.SOLUTION: There is provided a coating method for coating a coating composition onto a coated article. In coating of the coating composition, an acoustic array member sends acoustic waves and generates acoustic oscillation, the acoustic array member is composed of a plurality of sound wave transducers, the acoustic oscillation keeps floating of the coating composition, and coating is performed by bonding the floating coating composition to the coated article.SELECTED DRAWING: Figure 1

Description

The present invention relates to a coating method and a coating system utilizing acoustic vibration.

A typical example of a method for painting a coating composition is spray painting using a spray device. Spray coating is generally performed by moving a coating composition in a fine particle state to the surface of an object to be coated by using an air flow or the like. Since the spray coating sprays the coating composition in the form of fine particles, there is an advantage that a coating film having a good appearance can be obtained. On the other hand, in the above-mentioned spray coating, since an air flow is used for the movement of the coating composition, the coating composition in the fine particle state is diluted with air during the movement, and there is a problem that the movement efficiency is inferior.

In the above spray coating, since it is necessary to make the coating composition into fine particles at the ejection port of the spraying instrument, the viscosity, solid content, etc. of the coating composition are limited in order to prevent clogging of the ejection port. There is. Further, spray coating generally has a technical problem that the appearance of the coating film changes due to the influence of the coating environment such as temperature or humidity.

For example, Japanese Patent Application Laid-Open No. 2016-144805 (Patent Document 1) describes a coating for coating a component with a coating agent, specifically, a coating for coating a vehicle part and / or a vehicle accessory with a paint. The device comprises at least one coating device that ejects the coating agent from at least one coating agent nozzle, allowing the coating agent and / or at least one coating agent jet to be shredded into droplets. For this purpose, a coating device is described in which the coating apparatus is provided to apply vibration to the coating agent and / or the at least one coating agent jet.

Japanese Unexamined Patent Publication No. 2016-144805

For example, in the technique described in Patent Document 1 or the like, a vibration generator that applies vibration so that the coating agent jet is in a finely crushed state is provided in a nozzle portion or the like for discharging the coating agent. On the other hand, for example, in the above-mentioned technology, even if the coating agent is in a state of being finely crushed by vibration, it may aggregate due to the influence of air flow or the like while the coating agent moves onto the surface of the object to be coated. be.
The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a coating method characterized by keeping the coating composition floating by utilizing acoustic vibration.

In order to solve the above problems, the present invention provides the following aspects.
[1]
A painting method in which a paint composition is applied to an object to be coated.
In the painting of the above coating composition, the acoustic array member sends an acoustic wave to generate an acoustic vibration, and the acoustic vibration is generated.
The acoustic array member is composed of a plurality of sound wave oscillators.
The acoustic vibration keeps the paint composition floating and keeps it floating.
Painting is performed by adhering the floating paint composition to the object to be coated.
Painting method.
[2]
In the coating, two or more acoustic array members are installed at positions interposing the object to be coated.
The painting method of [1].
[3]
The acoustic wave includes at least one of a longitudinal wave, a shear wave, a surface wave and a plate wave.
The painting method of [1] or [2].
[4]
The acoustic array member is a phased array.
Any painting method from [1] to [3].
[5]
The acoustic array member sends a focused acoustic wave to the object to be coated, and the interference of the focused acoustic wave defines an acoustic wave interference zone around the object to be coated.
Any painting method from [1] to [4].
[6]
The coating method according to any one of [1] to [5], wherein the coating composition is floated by the acoustic vibration.
[7]
The coating method according to any one of [1] to [6], wherein the coating composition is a water-based coating composition, a solvent-based coating composition, or a powder coating composition.
[8]
The coating method according to any one of [1] to [7], wherein the object to be coated is composed of at least one selected from the group consisting of a metal substrate and a plastic substrate.
[9]
The coating method according to any one of [1] to [8], wherein the object to be coated is a vehicle body or a part of a moving vehicle.
[10]
A coating system that applies a coating composition to an object to be coated.
The coating system comprises at least an acoustic array member and a coating composition supply unit.
The acoustic array member is a member that transmits acoustic waves to generate acoustic vibrations.
The acoustic array member is composed of a plurality of sound wave oscillators.
The acoustic vibration keeps the paint composition floating and keeps it floating.
Painting is performed by adhering the floating paint composition to the object to be coated.
Painting system.
[11]
The coating system according to [10], wherein in the coating system, two or more acoustic array members are installed at positions interposing the object to be coated.

According to the method of the present invention, the coating composition can be coated by utilizing acoustic vibration.

It is a schematic diagram of 1 Embodiment of the said coating system. It is a schematic diagram of another 1st Embodiment of the said coating system. It is a schematic diagram of another 1st Embodiment of the said coating system. It is a schematic diagram of another 1st Embodiment of the said coating system. It is a schematic diagram of another 1st Embodiment of the said coating system.

The above painting method and painting system will be described below with reference to the drawings. The drawings are schematics such as one embodiment of the present disclosure, and coating systems with different structures and / or embodiments do not deviate from the scope of the invention.

FIG. 1 is a schematic view of one embodiment of a painting system that performs the above painting method. The painting system 1 is
A coating system for coating a coating composition 11 on an object to be coated 41.
The coating system 1 includes at least an acoustic array member 21 and a coating composition supply unit 13.
The acoustic array member 21 is a member that transmits an acoustic wave 31 to generate an acoustic vibration.
The acoustic array member 21 is composed of a plurality of sound wave oscillators 23.
The acoustic vibration keeps the paint composition floating and keeps it floating.
The floating coating composition adheres to the object to be coated 41 to perform coating.
The painting system.

The coating system schematically described with reference to FIGS. 1 and 3 is an embodiment in which two or more acoustic array members 21 are installed at positions interposing the object to be coated 41.
In the painting system schematically described with reference to FIGS. 2 and 4, one acoustic array member 21 is arranged, and an acoustic absorber or an acoustic reflector is arranged at a position axially opposite to the acoustic array member with respect to the object to be coated 41. This is an embodiment in which the body 45 is arranged.
In the coating system schematically described with reference to FIG. 5, the position of the acoustic array member 21 installed at the position interposedtaining the object to be coated 41 is different from that of FIGS. 1 and 3.

The coating method of the present disclosure is a method of coating the coating composition 11 on the object to be coated 41 by utilizing acoustic vibration. In this coating method, in the coating of the coating material 11, the acoustic array member 21 sends out an acoustic wave 31 to generate an acoustic vibration, and the acoustic vibration keeps the coating composition floating, and the floating coating composition. Adheses to the object to be coated 41, so that coating is performed. Here, the acoustic array member 21 is composed of a plurality of sound wave oscillators 23.

The coating composition that can be used in the coating method and coating system of the present disclosure is not particularly limited, and for example, a water-based coating composition, a solvent-based coating composition, or a powder coating composition can be used. The coating composition may be produced by a method usually used by those skilled in the art, or a commercially available product may be used.

The object to be coated by the coating method of the present disclosure is not particularly limited, and examples thereof include a metal substrate, a plastic substrate, and a foam. Examples of the metal base material include elemental metals such as iron, copper, aluminum, tin, and zinc, and alloys containing these elemental metals. Specifically, it can take the form of a body and parts of a moving vehicle such as a passenger car, a truck, a motorcycle, or a bus. Examples of the plastic base material include polypropylene resin, polycarbonate resin, urethane resin, polyester resin, polystyrene resin, ABS resin, vinyl chloride resin, polyamide resin and the like, and examples thereof include spoilers, bumpers, mirror covers, grills, and the like. Examples include parts of mobile vehicles such as door knobs. Suitable objects to be coated include, for example, the vehicle body or parts of a moving vehicle.

The object to be coated may have an undercoat coating film or the like, if necessary, depending on the type of the constituent base material. For example, in the metal base material (which may be a vehicle body or a part), a chemical conversion film, an electrodeposition coating film, and an intermediate coating film may be formed in this order in advance, and the chemical conversion film and the electrodeposition coating film may be formed. The coating film may be formed in advance in this order. Further, for example, the primer coating film may be formed in advance on the plastic base material.

The object to be coated may be held by a holding member as needed at the time of painting. The holding member may be accompanied by a movable portion capable of adjusting the position of the object to be coated, if necessary.

In the above painting, the acoustic wave 31 transmitted from the acoustic array member 21 generates acoustic vibration. Here, the acoustic vibration keeps the coating composition floating. Acoustic vibrations can, for example, make the coating composition into smaller granular states, which can better retain the floating of the coating composition.

The acoustic wave in the present specification is a general term for a mechanical wave transmitted from a sound wave oscillator, and the sound wave means each component of the mechanical wave constituting the acoustic wave. In the present specification, "sound wave" is a term used according to terms such as acoustic vibration, and is not limited to human audible sound. Therefore, the sound wave in the present specification also includes the wavelength range of so-called ultrasonic waves. The sound waves herein may include waves having frequencies from, for example, 10 Hz to 10000 MHz. The frequency may be, for example, in the range of 1 kHz to 20 MHz and may be in the range of 1 MHz to 10 MHz.

For example, in one embodiment, an independent type of wave (for example, a longitudinal wave, a shear wave, a surface wave, or a plate wave) is transmitted from each of the sound wave oscillators constituting the acoustic array member, so that the acoustic array member emits an acoustic wave. Waves are sent. In another aspect, the acoustic wave is transmitted from the acoustic array member by transmitting sound waves having independent frequencies from each of the sound wave oscillators constituting the acoustic array member. In another aspect, an aspect of a combination of the above aspects can be mentioned. In the acoustic wave transmitted from the acoustic array member, a desired pattern of acoustic vibration is generated due to the interaction of the acoustic wave with the air medium and the like. The generation of acoustic vibration may be accompanied by, for example, modulation processing, if necessary.

The acoustic array member may be an acoustic transducer driven by a voltage application to generate an acoustic signal. For example, the acoustic array member may be a piezoelectric transducer that converts electrical energy into sound energy.

The acoustic array member has two or more acoustic oscillators. The number of sound wave oscillators included in the acoustic array member can be appropriately selected depending on the coating system, the configuration of the object to be coated, and the like. The sound wave oscillator included in the acoustic array member may be, for example, 4, may be, for example, 16, may be, for example, 128, or may be, for example, 256. The arrangement of the sound wave oscillator in the acoustic array member may be, for example, a geometric shape that concentrates the acoustic wave transmitted by the acoustic array member toward the object to be coated.

The acoustic array member may be a phased array or a parametric array that generates sound waves from a plurality of sound wave oscillators at different cycles. For example, the pattern in the phased array may include a linear shape, a matrix shape and / or an annular shape. The acoustic array members may be pulse-modulated simultaneously or independently of each other during pattern changes to achieve specific beam characteristics.

In the coating method and the coating system, the floating state of the coating composition is maintained by the acoustic vibration. Then, the coating composition in a floating state adheres to the object to be coated, so that the object to be coated is painted.

As one of the embodiments in which the floating state of the coating composition is maintained by the acoustic vibration, the acoustic vibration includes a standing wave (standing wave), so that the minute coating composition is located at the position of the sound pressure node of the standing wave. Is held, and a floating state of the coating composition is generated. In addition, there is an embodiment in which the coating composition in a granular state (fine particle state) is held at the position of the node sandwiched between the antinodes of the sound pressure of the acoustic vibration, and the floating state of the coating composition is generated.

In the above, the size of the coating composition in which the floating state is maintained depends on, for example, the wavelength of sound waves. Specifically, a coating composition in a granular state (fine particle state) having a size in the range of about 1/4 to about 1/100 of the wavelength of a standing wave tends to maintain a good floating state.

The size of the coating composition in the granular state (fine particle state) in which the floating state is maintained can be determined, for example, by measuring with image analysis software.

As one aspect of the above aspect, for example, the acoustic array member sends a focused acoustic wave to the object to be coated, and the interference of the focused acoustic wave defines an acoustic wave interference zone around the object to be coated. As a result, the floating state of the coating composition is maintained.

The paint composition whose floating is maintained by acoustic vibration can change the position where it is suspended and retained by, for example, changing the phase difference, amplitude, and the like of the acoustic wave. The change in the position where the coating composition is suspended and held may be one-dimensional, two-dimensional, or three-dimensional. For example, the coating composition can be floated by acoustic vibration, and the position of the coating composition that is suspended and held can be changed in a direction contrary to gravity.

The coating method and coating system of the present disclosure are preferably an embodiment in which the change in the position where the coating composition is suspended and held is two-dimensional or three-dimensional, and more preferably the change in the position is three-dimensional. Is. Such an aspect has an advantage that the adhesion of the coating composition to the object to be coated can be improved.

The coating system schematically described with reference to FIGS. 1 and 2 is an embodiment in which the coating composition is supplied from the upper portion of the object to be coated. In these embodiments, the coating composition is supplied, for example, in a certain amount of granules. In such an embodiment, the supply portion of the coating composition may be from a substantially horizontal direction or an oblique direction with respect to the object to be coated. Further, in the coating system, the coating composition supplied in a certain degree of granularity may be refined by the acoustic vibration and then kept floating.

The coating system schematically described with reference to FIGS. 3 and 4 is an embodiment in which the coating composition is supplied from a portion below the object to be coated. In these embodiments, the coating composition is floated and held in a floating manner by the above-mentioned acoustic vibration, in which the coating composition moves in a direction against gravity. The coating composition may be supplied from substantially horizontal to the object to be coated. Further, in the coating system, the coating composition may be floated and finely granulated by the acoustic vibration.

The coating system schematically described in FIG. 5 is another aspect relating to the location of two or more acoustic array members installed at locations intervening with an object to be coated. The "position where the acoustic array member mediates the object to be coated" in the present disclosure may be, for example, a position as schematically described in FIG. For example, in the embodiment schematically described with reference to FIG. 5, for example, an acoustic absorber or an acoustic reflector 45 may be installed as needed.

In the coating method and coating system of the present disclosure, for example, the coating composition supplied from the supply unit is suspended and held in a granular state (fine particle state). Therefore, there is an advantage that it is possible to effectively prevent the generation of aggregation due to the air flow that moves the coating composition in, for example, conventional spray coating. Further, in the above coating method, since it is not essential that the coating composition is in a fine particle state in the coating composition supply section, there is an advantage that problems such as clogging in the ejection section that supplies the coating composition can be reduced. be. Since it is possible to reduce clogging of the discharge portion, it is possible to easily manage the coating machine, and further, there are advantages such as being able to reduce the amount of waste of the coating composition that may occur during painting. The coating method and coating system of the present disclosure further have advantages such as simplification of exhaust equipment in the coating system.

In the coating method and coating system of the present disclosure, as described above, since the coating composition is suspended and held in a granular state (fine particle state), spraying work using an air flow is not essential, but an air flow is required. Does not preclude the use of.

The coating methods and systems of the present disclosure also have the advantage of being able to reduce the effects of the coating environment, such as temperature or humidity, as they do not require the use of airflow in the movement of the coating composition in coating. The coating method and coating system of the present disclosure propose a new coating method and expand the coating possibilities.

The coating methods and systems of the present disclosure are characterized by utilizing acoustic vibration to keep the coating composition floating and have industrial advantages that can be used in the coating of various coating compositions. ..

1: Painting system,
11: Paint composition,
13: Paint composition supply unit,
21: Acoustic array member,
23: Sonic oscillator,
31: Acoustic wave,
41: Object to be coated,
43: Holding member,
45: Sound absorber or sound reflector.

Claims (11)

A painting method in which a paint composition is applied to an object to be coated.
In the painting of the coating composition, the acoustic array member sends an acoustic wave to generate an acoustic vibration, and the acoustic vibration is generated.
The acoustic array member is composed of a plurality of sound wave oscillators.
The acoustic vibration keeps the paint composition floating and
Painting is performed by adhering the floating coating composition to the object to be coated.
Painting method. In the coating, two or more acoustic array members are installed at positions interposing the object to be coated.
The coating method according to claim 1. The acoustic wave includes at least one of a longitudinal wave, a shear wave, a surface wave and a plate wave.
The coating method according to claim 1 or 2. The acoustic array member is a phased array.
The coating method according to any one of claims 1 to 3. The acoustic array member sends focused acoustic waves to the object to be coated, and the interference of the focused acoustic waves defines an acoustic wave interference zone around the object to be coated.
The coating method according to any one of claims 1 to 4. The coating composition floats due to the acoustic vibration.
The coating method according to any one of claims 1 to 5. The coating composition is a water-based coating composition, a solvent-based coating composition, or a powder coating composition.
The coating method according to any one of claims 1 to 6. The object to be coated is composed of at least one selected from the group consisting of a metal substrate and a plastic substrate.
The coating method according to any one of claims 1 to 7. The coating method according to any one of claims 1 to 8, wherein the object to be coated is a vehicle body or a part of a moving vehicle. A coating system that applies a coating composition to an object to be coated.
The coating system comprises at least an acoustic array member and a coating composition supply unit.
The acoustic array member is a member that transmits acoustic waves to generate acoustic vibrations.
The acoustic array member is composed of a plurality of sound wave oscillators.
The acoustic vibration keeps the paint composition floating and
Painting is performed by adhering the floating coating composition to the object to be coated.
Painting system. In the painting system, two or more of the acoustic array members are installed at positions interposing the object to be coated.
The coating system according to claim 10.

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