JP6803051B2 - Particle coating device and heater safety device - Google Patents

Description

The present invention, by spraying into a spray space volatile spray using compressed gas for applying a plurality of particles to a target surface technique, and, using a heater which is used to warm the compressed gas The present invention relates to a technique for cooling in a stopped state .

In recent years, attention has been paid to the use of particles having unique properties in various applications. An example of such particles is photocatalytic particles. The photocatalytic particles are particles that exert a catalytic action when they receive light, and titanium oxide TiO ₂ is widely used as a typical one.

Important features of photocatalytic particles are high decomposing power (strong oxidizing action) and high hydrophilicity. Thanks to its high decomposing power, photocatalytic particles decompose organic matter to remove dirt and odors, and also have antibacterial action. In addition, due to the high hydrophilicity, the surface coated with the photocatalyst particles becomes easily wetted with water, and the effects of self-cleaning and anti-fog can be obtained.

Patent Document 1 discloses a conventional example of a photocatalyst particle coating method in which a plurality of photocatalyst particles are sprayed onto a target surface for coating. In this conventional method, a heating step of heating a volatile spray liquid in which a plurality of photocatalyst particles are mixed in a volatile medium in a dispersed state, and a compressed gas are combined with the heated spray liquid. It is configured to include a spraying step of supplying to a spray gun, thereby atomizing the spray liquid with the compressed gas and spraying from the spray gun.

JP-A-2007-229587

The present inventor has conducted research on the conventional method. As a result, the following findings were obtained.

In this conventional method, the heated spray liquid has a volatile medium in the spray liquid during the period from the ejection of the spray gun to the arrival at the target surface, that is, during the flight (floating) period. Ideally, it should be completely vaporized. When the volatile medium is vaporized, the plurality of particles mixed in the spray liquid are released from the binding of the volatile medium (liquid), whereby the particles are dispersed with each other and each particle is almost independently. Float in the air.

The plurality of particles have a strong tendency to agglomerate with each other when they are mixed in the volatile medium, whereas the plurality of particles have a strong tendency to disperse with each other when they are suspended in the air almost independently.

Further, the stronger the tendency of the plurality of particles to be dispersed with each other, the stronger the tendency of the particles to be uniformly dispersed on the target surface when the particles reach the target surface and adhere to the target surface.

When a plurality of particles are uniformly dispersed and applied on the target surface in this way, the area of the continuous region where none of the particles are attached, that is, the particle-absent region is reduced on the target surface. ..

It is important for the photocatalytic particles to come into contact with an object that undergoes a chemical reaction promoted by the photocatalytic action in order to maximize the photocatalytic effect. Therefore, the larger the area of the particle-free region on the target surface, the lower the photocatalytic effect.

Therefore, it is ideal that the sprayed spray liquid is completely vaporized before it reaches the target surface. However, the ease of vaporization of the spray liquid depends on the temperature of the spray liquid, and specifically, the lower the temperature, the more difficult it is to vaporize. On the other hand, the temperature of the spray liquid depends on the outside air temperature. Specifically, the lower the outside air temperature, the lower the temperature of the spray liquid.

Therefore, when the conventional method is carried out in a situation where the outside air temperature is low (for example, 0 ° C.), the vaporization of the sprayed spray liquid is incomplete, and as a result, a plurality of particles are placed on the target surface. It was unevenly distributed. While a plurality of particles were locally densely overlapped on the target surface, there was a continuous region in which none of the particles existed.

Based on the findings described above, the present invention is a technique for applying a plurality of particles to a target surface using a compressed gas, in which the compressed gas is heated by a heater and the heater is cooled , and the heater thereof. The object was to provide a technique for cooling the gas in a stopped state .

In order to solve the problem , according to the first aspect of the present invention, it is a particle coating device that coats a plurality of particles on a target surface.
A heater that heats the compressed gas and
When the spray liquid in which the plurality of particles are mixed in a volatile solvent in a dispersed state is supplied together with the heated compressed gas, the spray liquid is introduced into the spray space using the compressed gas. With a spray gun to spray
A part of the compressed gas provided between the heater and the spray gun and supplied from the heater is supplied to the spray gun, and another part is released to the atmosphere, whereby the heater is operated. A heater safety device that forcibly air-cools the heater by passing compressed gas through the heater in the stopped state.
A particle coating device including the above is provided.
Further, according to the second aspect of the present invention, in order to apply the plurality of particles to the target surface, a heater for heating the compressed gas and the plurality of particles are mixed in a volatile solvent in a dispersed state. A heater used in a particle coating apparatus including a spray gun that, when the spray liquid is supplied together with the heated compressed gas, sprays the spray liquid into the spray space using the compressed gas. It ’s a safety device,
A part of the compressed gas supplied from the heater is supplied to the spray gun, and another part is released to the atmosphere, whereby the compressed gas passes through the heater in the stopped operation state of the heater. Thereby, a heater safety device for forcibly air-cooling the heater is provided.
Further , according to an aspect of the present invention, it is a particle coating device that coats a plurality of particles on a target surface.
A heater that heats the compressed gas and
When the spray liquid in which the plurality of particles are mixed in a volatile solvent in a dispersed state is supplied together with the heated compressed gas, the spray liquid is introduced into the spray space using the compressed gas. With a spray gun to spray
Particle coating including a heater safety device provided between the heater and the spray gun, supplying a part of the compressed gas supplied from the heater to the spray gun and releasing another part to the atmosphere. Equipment is provided.

Further , according to one aspect of the present invention, it is a particle coating device that coats a plurality of particles on a target surface.
A first heater that heats a spray liquid in which the plurality of particles are dispersed in a volatile solvent to a first temperature, and
A second heater that heats the compressed gas to a second temperature,
When the heated spray liquid is supplied together with the heated compressed gas, a spray gun that sprays the spray liquid into the spray space using the compressed gas, and a spray gun.
Heater safety provided between the second heater and the spray gun, supplying a part of the compressed gas supplied from the second heater to the spray gun and releasing another part to the atmosphere. A particle coating device including a device is provided.

According to an aspect of the present invention, it is a particle coating device that sprays and coats a plurality of particles on a target surface.
A first heater that heats a spray liquid in which the plurality of particles are dispersed in a volatile solvent to a first temperature, and
A second heater that heats the compressed gas to a second temperature,
When the heated spray liquid is supplied together with the heated compressed gas, the spray gun includes a spray gun that sprays the spray liquid into the spray space using the compressed gas.
The spray gun
A spray liquid injection port for injecting the spray liquid into the spray space,
A compressed gas injection port that injects the compressed gas into the spray space,
When the spray gun is viewed from the front, warm air is arranged at a position laterally deviated from the spray liquid injection port and the compressed gas injection port, and is hotter than the surrounding space surrounding the spray space from the side. Includes a warm air injection port that jets forward, thereby forming a warm air shield with an annular cross section that surrounds the spray space from the side.
The compressed gas injection port is
A plurality of first gas injection holes arranged at substantially equal intervals along a circumference coaxial with the spray liquid injection port, and
A particle coating device including a plurality of second gas injection holes arranged at a plurality of positions deviating from the positions of the plurality of first gas injection holes in a radial direction outward with respect to the center line of the spray liquid injection port. Is provided.

Further, according to the first aspect of the present invention, it is a spray gun that sprays a volatile spray liquid into a spray space.
A spray liquid injection port for injecting the spray liquid into the spray space,
A compressed gas injection port that injects compressed gas into the spray space,
When the spray gun is viewed from the front, warm air is arranged at a position laterally separated from the spray liquid injection port and the compressed gas injection port, and is hotter than the surrounding space surrounding the spray space from the side. Is provided forward, thereby providing a spray gun that includes a warm air jet that forms a warm air shield with an annular cross section that surrounds the spray space from the side.

Before spraying with this spray gun, a plurality of particles are mixed in the spray liquid in a dispersed state. The spray liquid is atomized (mist) by the spray of this spray gun, and in that state, it is made to fly in the air toward the target surface. That is, the spray liquid can fly in the air in the form of a collection of a plurality of fine particles (droplets) in the mist.

After spraying with this spray gun, the volatile medium of the fine particles in each mist takes heat from the surroundings and vaporizes in the process of flying the fine particles in the mist toward the target surface in the air. When the volatile medium of the fine particles in each mist is vaporized, the plurality of particles mixed in the fine particles in each mist fly in the air by themselves. On the other hand, when the plurality of particles are mixed in the fine particles in each mist, they tend to aggregate with each other, but when the fine particles in each mist themselves float in the air, they tend to disperse with each other.

The temperature of the fine particles in each mist flying in the air is affected by the outside air temperature. Specifically, when the outside air temperature is lower than the temperature of the spray liquid, the spray liquid is cooled by the outside air.

In this spray gun, if the surrounding space surrounding the spray space from the side of the spray space is cooler than the spray space in which the spray liquid flies, the air in the spray space may be cooled by the air in the surrounding air. There is sex. The heat of vaporization is taken from the air because the spray liquid vaporizes in the spray space. Therefore, the spray space may be colder than the surrounding space.

On the other hand, in this spray gun, when the spray gun is viewed from the front, the hot air injection port is arranged at a position laterally deviated from the spray liquid injection port and the compressed gas injection port. This spray gun injects warm air, which is hotter than the surrounding space, forward from its hot air injection port, thereby forming a warm air shield having an annular cross section that surrounds the spray space from the side. Since the warm air shield is hotter than the surrounding space, the temperature of the spray space does not need to be cooled by the surrounding air as compared with the case where the warm air shield does not exist.

On the other hand, the higher the temperature of the spray liquid sprayed by this spray gun, the easier it is to vaporize. The easier it is to vaporize the spray, the more likely it is that all the spray will vaporize after the spray has been sprayed from the spray gun until it reaches the target surface.

In addition, each of the fine particles (droplets) in the mist sprayed by this spray gun takes away the heat required for it to vaporize from the surroundings as heat of vaporization. Therefore, the higher the temperature around the fine particles in the mist, that is, the temperature of the compressed gas surrounding the fine particles in the mist, the easier it is for the spray liquid to vaporize.

As a result, according to this spray gun, the spray liquid is more likely to float in the air on its own, and thus all particles, compared to the case where the warm air shield is not formed. There is an increasing tendency to fly and reach the target surface even more dispersedly.

Therefore, according to this spray gun, substantially all of the spray liquid sprayed by this spray gun vaporizes by the time it reaches the target surface without being affected so strongly by the outside air temperature. It will be easy to realize.

If it is realized that substantially all of the spray liquid sprayed by this spray gun vaporizes by the time the spray liquid reaches the target surface, the plurality of particles are each alone, that is, in the spray liquid. It will fly and reach the target surface in a state where it is not mixed (a state where it is released from the binding of the spray liquid).

Therefore, according to this spray gun, there is an increased tendency for the plurality of particles to be uniformly dispersed on the target surface. That is, according to this spray gun, a plurality of particles are dispersed with each other over the entire area on the target surface, and the degree of dispersion is made uniform over the entire area of the target surface.

If the tendency of the plurality of particles to disperse with each other on the target surface becomes stronger, the concentration of the plurality of particles that can be contained in the spray liquid before spraying with the spray gun is increased while preventing the particles from being unevenly distributed on the target surface. It is possible to increase. As a result, it also becomes easy to increase the density of particles on the target surface.

That is, according to this spray gun, it becomes easy to apply a plurality of particles so as to be densely and uniformly dispersed on the target surface.

Due to the uniform dispersion of the plurality of particles on the target surface, the area of the continuous region on the target surface to which none of the particles are attached is reduced. Also, because the density of particles on the target surface increases, the area of the continuous region where no particles exist on the target surface decreases.

As a result, according to this spray gun, when the plurality of particles contain a plurality of photocatalytic particles, the photocatalytic effect of the plurality of photocatalytic particles adhering to the target surface is maximized (that is, the number of photocatalytic particles is maximized). (Achieves a relatively large photocatalytic effect) becomes easy.

In this spray gun, the "spray liquid" may include, for example, a plurality of particles having a component that finally remains because they do not completely volatilize, or may be a plurality of solid particles. It is possible to prepare to contain a volatile liquid or a non-volatile liquid instead of containing those that can be charged or particles thereof.

In a preferred embodiment of this spray gun, a diffuser is further used to diffuse the spray liquid sprayed from the spray liquid outlet.

In another desirable embodiment of the spray gun, a passage is further used that is common to both the compressed gas injection port and the warm air injection port for the compressed gas that has been heated.

Further, according to the second aspect of the present invention, it is a particle coating device that sprays and coats a plurality of particles on a target surface.
A first heater that heats a spray liquid in which the plurality of particles are mixed in a volatile solvent in a dispersed state, and
A second heater that heats the compressed gas,
When the heated spray liquid is supplied together with the heated compressed gas, the spray gun includes a spray gun that sprays the spray liquid into the spray space using the compressed gas.
The spray gun
A spray liquid injection port for injecting the spray liquid into the spray space,
A compressed gas injection port that injects the compressed gas into the spray space,
When the spray gun is viewed from the front, warm air is arranged at a position laterally deviated from the spray liquid injection port and the compressed gas injection port, and is hotter than the surrounding space surrounding the spray space from the side. Is provided forward, thereby providing a particle coating apparatus including a warm air injection port that forms a warm air shield having an annular cross section that surrounds the spray space from the side.

In a desirable aspect of the particle coating apparatus, further, microbubble generation that generates a plurality of microbubbles in each part of the spray liquid is generated prior to each part of the spray liquid being sprayed from the spray liquid injection port. The device is used.

In a preferred embodiment of some of the particle coating devices described above, the plurality of particles carry metallic silver particles in a state of being exposed on their respective surfaces.

Further, according to the third aspect of the present invention, it is a spraying method for spraying a volatile spray liquid into a spray space.
A spray liquid injection step of heating the spray liquid and spraying it into the spray space,
A compressed gas injection step of heating the compressed gas and injecting it into the spray space, thereby promoting atomization of the spray liquid.
Warm air, which is hotter than the surrounding space surrounding the spray space from the side, is sprayed so as to form a warm air shield having an annular cross section surrounding the spray space from the side, thereby forming the spray space. A spraying method is provided that includes a warm air shield forming step that promotes heat retention inside.

In this spraying method, the "spray liquid" may contain, for example, a plurality of particles having a component that finally remains because they do not completely volatilize, or may be a plurality of solid particles. It is possible to prepare to contain a volatile liquid or a non-volatile liquid instead of containing those that can be charged or particles thereof.

According to the present invention, the following aspects can be obtained. Each aspect is divided into sections, each section is numbered, and if necessary, the numbers of other sections are cited. This is to facilitate understanding of some of the technical features that can be adopted by the present invention and combinations thereof, and the technical features that can be adopted by the present invention and combinations thereof are limited to the following aspects. Should not be interpreted as. That is, it should be interpreted that it is not hindered from appropriately extracting and adopting the technical features described in the present specification as the technical features of the present invention, which are not described in the following aspects.

Furthermore, describing each term in the form of quoting the numbers of the other sections does not necessarily prevent the technical features described in each section from being separated and independent from the technical features described in the other sections. It does not mean, and it should be interpreted that the technical features described in each section can be made independent as appropriate according to their properties.

(1) A particle coating method in which a plurality of particles are sprayed onto a target surface for coating.
A solution heating step of heating a volatile spray liquid in which a plurality of particles are mixed in a dispersed state, and
The gas heating process that heats the compressed gas and
The spraying step of supplying the heated compressed gas together with the heated spray liquid to the spray gun, thereby atomizing the spray liquid using the compressed gas and injecting the spray liquid from the spray gun. Including
In the solution heating step and the gas heating step, the solution heating step is such that the spray liquid vaporized substantially as a whole before the spray liquid sprayed from the spray gun reaches the target surface. A particle coating method for heating the spray solution and the compressed gas to a temperature at a height at which the gas heating steps are jointly realized.

In this method, before spraying with the spray gun, a plurality of particles are mixed in the spray liquid in a dispersed state. The spray liquid is atomized (mist) by spraying with a spray gun, and in that state, it is made to fly in the air toward the target surface. That is, the spray liquid can fly in the air in the form of a collection of a plurality of fine particles (droplets) in the mist.

After spraying with a spray gun, the volatile medium of each mist fine particle takes heat from the surroundings and vaporizes in the process of each mist fine particle flying in the air toward the target surface. When the volatile medium of the fine particles in each mist is vaporized, the plurality of particles mixed in the fine particles in each mist fly in the air by themselves. On the other hand, when the plurality of particles are mixed in the fine particles in each mist, they tend to aggregate with each other, but when the fine particles in each mist themselves float in the air, they tend to disperse with each other.

The temperature of the fine particles in each mist flying in the air is affected by the outside air temperature. Specifically, when the outside air temperature is lower than the temperature of the spray liquid, the spray liquid is cooled by the outside air.

The mist-like spray liquid flying in the air after spraying with the spray gun is a mixture of the fine particles in each mist and the compressed gas used to atomize the spray liquid. The fine particles in each mist are surrounded by the compressed gas ejected from the same spray gun. That is, each fine particle in the mist can be flown in the air while being surrounded by the compressed gas.

In the method according to this section, not only the spray liquid but also the compressed gas is heated prior to spraying with the spray gun. As a result, according to this method, in addition to being directly heated before spraying with the spray gun, the spray liquid is a heated compressed gas in the spraying step with the spray gun. It is also heated by what is sprayed from the spray gun along with.

Therefore, according to this method, as long as the temperature of the compressed gas is higher than the outside air temperature after spraying with the spray gun, the amount of decrease in the temperature of the atomized spray liquid due to the outside air is smaller than that when the compressed gas is not heated. It's done.

On the other hand, the higher the temperature of the spray liquid sprayed by the spray gun, the easier it is to vaporize. The easier it is to vaporize the spray, the more likely it is that all the spray will vaporize after the spray has been sprayed from the spray gun until it reaches the target surface.

In addition, each of the fine particles (droplets) in the mist sprayed by the spray gun takes away the heat required for it to vaporize from the surroundings as heat of vaporization. Therefore, the higher the temperature around the fine particles in the mist, that is, the temperature of the compressed gas surrounding the fine particles in the mist, the easier it is for the spray liquid to vaporize.

As a result, according to the method according to this section, all the particles are more likely to float in the air by themselves, and by extension, all of them, as compared with the case where the spray liquid only heats the spray liquid. There is an increasing tendency for the particles to fly larger and dispersed with each other to reach the target surface.

Further, in the method according to this section, after spraying with a spray gun, the spray liquid is vaporized substantially as a whole before the spray liquid reaches the target surface, and the spray liquid is heated and the compressed gas is heated. The spray liquid and the compressed gas are heated to a temperature at a height that can be realized jointly with each other.

Therefore, according to this method, not only the spray liquid but also the compressed gas is heated, so that the spray liquid sprayed by the spray gun reaches the target surface without being affected by the outside air temperature so strongly. It becomes easy to realize that substantially all of the spray liquid is vaporized.

If it is realized that substantially all of the spray liquid sprayed by the spray gun vaporizes by the time the spray liquid reaches the target surface, the plurality of particles are mixed alone, that is, in the spray liquid. It will fly and reach the target surface in the state where it is not (the state where it is released from the binding of the spray liquid).

Therefore, according to this method, more than one particle is on the target surface than if it is not realized that substantially all of the spray liquid sprayed by the spray gun vaporizes by the time it reaches the target surface. Disperse evenly.

That is, according to this method, a plurality of particles are dispersed with each other over the entire area on the target surface, and the degree of dispersion is made uniform over the entire area of the target surface.

If the tendency of the plurality of particles to disperse with each other on the target surface becomes stronger, the concentration of the plurality of particles that can be contained in the spray liquid before spraying with the spray gun is increased while preventing the particles from being unevenly distributed on the target surface. It is possible to increase. As a result, it also becomes easy to increase the density of particles on the target surface.

That is, according to the method according to this section, it becomes easy to apply a plurality of particles so as to be densely and uniformly dispersed on the target surface.

Due to the uniform dispersion of the plurality of particles on the target surface, the area of the continuous region on the target surface to which none of the particles are attached is reduced. Also, because the density of particles on the target surface increases, the area of the continuous region where no particles exist on the target surface decreases.

As a result, according to this method, it becomes easy to maximize the photocatalytic effect of a plurality of particles adhering to the target surface (that is, to realize a large photocatalytic effect for the number of particles).

(2) The particle coating method according to item (1), wherein the temperature at which the gas heating step heats the compressed gas is equal to or higher than the temperature at which the solution heating step heats the spray liquid. ..

According to this method, the temperature at which the compressed gas is heated (the target temperature of the compressed gas or the temperature of the compressed gas immediately after the spray gun is ejected) is the temperature at which the spray liquid is heated (the target temperature of the spray liquid or the spray gun). It is not lower than the temperature of the spray liquid immediately after ejection).

On the other hand, if the temperature of the compressed gas is not lower than the temperature of the spray liquid after being sprayed by the spray gun, the temperature drop of the spray liquid is effectively suppressed by the compressed gas.

That is, according to this method, in addition to the spray liquid being heated before spraying by the spray gun (the spray liquid is heated to a temperature higher than the outside air temperature), during the spraying process by the spray gun, The temperature drop of the spray liquid is suppressed by the compressed gas.

Therefore, according to this method, the ease of vaporization of the spray liquid is such that the temperature at which the compressed gas is heated (target temperature of the compressed gas) is higher than the temperature at which the spray liquid is heated (target temperature of the spray liquid). It improves more than when it is low.

Therefore, according to this method, it is more surely realized that substantially all of the spray liquid sprayed by the spray gun is vaporized by the time it reaches the target surface regardless of the temperature of the outside temperature. To.

(3) The temperature at which the gas heating step heats the compressed gas is in the range of about 50 to about 70 ° C.
The particle coating method according to item (2), wherein the temperature at which the solution heating step heats the spray liquid is in the range of about 30 to about 50 ° C.

(4) In the gas heating step, the compressed gas is heated to a height at which the temperature of the spray liquid after spraying the spray gun does not rise above the temperature before spraying the spray gun by the compressed gas. The particle coating method according to any one of (1) to (3).

The spray solution may be flammable. In this case, the higher the temperature of the spray liquid, the easier it is to vaporize the spray liquid, but when the temperature of the spray liquid is raised, the flammability and ignitability of the spray liquid increase. Therefore, there is a limit to raising the temperature of the spray liquid.

On the other hand, according to the method according to this section, the temperature of the spray liquid before spraying the spray gun and the temperature of the spray liquid during the spraying step of the spray gun are the temperature of the spray liquid before spraying the spray gun by the compressed gas. It is heated to a height that does not rise more. Therefore, the flammability and ignitability of the spray liquid do not increase due to the fact that the spray liquid is heated by the compressed gas during the spraying process of the spray gun.

Therefore, according to this method, the temperature drop of the spray liquid is suppressed while preventing the increase in flammability and ignitability of the spray liquid during the spraying process of the spray gun. As a result, according to this method, the ease of vaporization of the spray liquid is maintained without increasing the flammability and ignitability.

(5) In the gas heating step, the compressed gas is heated by using a heater.
The spray gun selectively switches between an inflow permitting state that permits the inflow of the compressed gas and an inflow blocking state that blocks the inflow of the compressed gas.
The particle coating method further
A gas supply step of supplying the compressed gas to the heater regardless of whether the inflow is permitted or blocked.
Item 2. The item (1) to (4), which includes a gas release step of releasing the compressed gas that has passed through the heater to the atmosphere in at least the inflow blocking state of the inflow permitting state and the inflow blocking state. Particle application method.

In this method, the compressed gas to be sprayed by the spray gun is heated by the heater.

By the way, while the compressed gas is flowing from the heater to the spray gun, the controller controls the on / off state of the heater so that the temperature of the compressed gas does not deviate from the allowable range in order to control the temperature of the compressed gas. Is normal.

The controller typically turns off the heater when the inflow of compressed gas from the heater to the spray gun is blocked, thereby stopping the use of the heater. The heater then dissipates heat to the atmosphere with the gas flow surrounding it almost stationary, thereby cooling the heater naturally.

However, when the heater is naturally air-cooled in this way, the temperature of the heater may temporarily rise immediately after the start of the air cooling. The temperature of the heater may rise above that during its use after the heater has been decommissioned. This is because if the gas flow around the heater is stopped immediately after the heater is turned off, the heat in the heater is not released and is accumulated in the heater.

On the other hand, the heater is usually configured by using a heat generating element (for example, a nichrome wire), and it is not desirable for the heat generating element that the heat generating element is maintained in a high temperature state for a long time. This is because the life of the heat generating element is shortened. Therefore, after the inflow of the compressed gas from the heater to the spray gun is blocked, it is desirable to turn off the heater and devise so that the temperature of the heater drops quickly.

On the other hand, according to the method according to this section, the compressed gas is supplied to the heater regardless of whether the spray gun is in the inflow permitted state or the inflow blocking state, and the inflow permitted state and the inflow of the spray gun. The compressed gas that has passed through the heater is released to the atmosphere in the blocked state, at least in the inflow blocked state.

As a result, according to this method, in the inflow blocking state of the spray gun (the use of the heater is stopped), the compressed gas having a temperature substantially equal to the outside air temperature is passed through the heater because it is not heated by the heater. Be done. As a result, the heater is forcibly air-cooled by the compressed gas.

Therefore, according to this method, when the inflow of compressed gas from the heater to the spray gun is blocked, the heater is forcibly air-cooled, whereby the temperature of the heater drops rapidly. As a result, the temperature rise of the heater is suppressed after the use of the heater is stopped, and thereby the decrease in the life of the heater due to overheating is suppressed.

(6) In the gas release step, the portion of the compressed gas that has passed through the heater that does not flow into the spray gun is discharged to the atmosphere in the inflow permitted state, while the heater is released in the inflow blocking state. The particle coating method according to item (5), wherein all of the compressed gas that has passed through the gas is released into the atmosphere.

To carry out this method, for example, in addition to the outlet port for supplying the compressed gas supplied to the heater to the spray gun, the heater is provided with an outlet port for discharging the compressed gas to the atmosphere. , The latter exit port should be open at all times.

Therefore, according to this method, it becomes easy to simplify the structure of the apparatus necessary for carrying out the method according to the above (5).

(7) In the gas release step, the compressed gas that has passed through the heater is not released to the atmosphere in the inflow permitted state, but all of the compressed gas that has passed through the heater is released to the atmosphere in the inflow blocking state. The particle coating method according to item (5).

According to this method, unlike the method according to the above item (6), a part of the heated compressed gas is not wastedly released to the atmosphere in the inflow permitted state of the spray gun.

Therefore, according to this method, the inflow permission state of the spray gun, that is, the heated compressed gas does not leak to the atmosphere during the use of the heater, so that the heat generated from the heater can be effectively used in the spray gun. It can be used to heat the compressed gas to be supplied.

(8) The particle coating method according to any one of (1) to (7), wherein the spraying step includes a charging step of charging the plurality of particles so as to have the same polarity in the spray gun.

According to this method, the plurality of particles sprayed by the spray gun are each charged with the same polarity, so that the particles are electrostatically repelled from each other. As a result, the particles tend to disperse with each other during flight more than if none of them were positively or negatively charged.

Therefore, according to this method, it becomes easy to increase the density of a plurality of particles adhering to the target surface.

(9) The item according to any one of (1) to (8), wherein the plurality of particles include a plurality of photocatalytic particles, and the photocatalytic particles carry a plurality of metallic silver particles on their respective surfaces. Particle coating method.

The photocatalytic particles have an antibacterial effect, the same effect as silver ions. On the other hand, metallic silver particles continuously release silver ions.

Based on the above findings, according to the method according to this section, each photocatalyst particle applied by the method according to any one of (1) to (8) above is formed on the surface of a plurality of metallic silver. It is assumed that the particles are supported.

Therefore, according to this method, in addition to the antibacterial effect of the photocatalytic particles, the antibacterial effect of the metallic silver particles is obtained, so that the antibacterial effect is improved as a whole.

(10) A photocatalytic coating method for coating a coating film formed on the surface of an object to be coated with a plurality of particles.
A solution heating step of heating a volatile spray liquid in which a plurality of particles are mixed in a dispersed state, and
The gas heating process that heats the compressed gas and
In the spraying step, the heated compressed gas is supplied to the spray gun together with the heated spray liquid, whereby the spray liquid is atomized using the compressed gas and sprayed from the spray gun. Then, in a semi-dry state, the spray liquid is sprayed toward the object to be coated, whereby the plurality of particles are applied to the surface of the coating film, and each particle locally coats the coating material. Including those that are applied so as to bite into the surface of the film,
In the solution heating step and the gas heating step, the solution heating means that the spray liquid vaporized substantially as a whole before the spray liquid sprayed from the spray gun reaches the surface of the coating film. A photocatalyst coating method for heating the spray solution and the compressed gas to a temperature at a height at which the warming step and the gas heating step are jointly realized.

According to this method, in order to coat a coating film with a plurality of particles, a coating step of forming a coating film and a coating step of coating the coating film with a plurality of particles are performed at intervals of time. Rather than being continuous with each other, i.e., before the coating process is completed, i.e., before the coating film formed by the coating process is completely dried, the coating process is initiated, thereby semi-drying. A plurality of particles are applied to the coating film and are allowed to bite into the coating film.

Therefore, according to this method, the time and labor required for the entire work can be reduced as compared with the case where the painting step and the coating step are time-separated from each other.

Further, according to this method, since each particle is applied in a state of partially biting into the coating film, each particle is applied as compared with the case where each particle previously surrounded by a binder is applied to a completely dry coating film. The film adheres firmly. Therefore, according to this method, the durability and durability of each particle continuing to adhere to the coating film can be easily improved.

(11) A particle coating device that sprays and coats a plurality of particles on a target surface.
A first heater that heats a volatile spray liquid in which the plurality of particles are mixed in a dispersed state, and
A second heater that heats the compressed gas for atomizing the spray liquid, and
The heated spray liquid includes a spray gun supplied together with the heated compressed gas, which atomizes and injects the spray liquid using the compressed gas.
The first and second heaters are the first and second heaters that substantially vaporize the spray liquid as a whole before the spray liquid sprayed from the spray gun reaches the target surface. A particle coating device that heats the spray liquid and the compressed gas to a temperature at a height that is jointly realized by the two.

(12) Further includes first and second outlet ports that allow the compressed gas heated by the second heater to flow out of the second heater.
From the first outlet port, the compressed gas from the second heater flows out toward the spray gun, while from the second outlet port, the compressed gas from the second heater. The particle coating apparatus according to item (11), wherein is released into the atmosphere.

According to this device, the method according to the above (5) or (6) is preferably carried out.

(13) The particle coating device according to item (12), further comprising a valve that closes the second outlet port in the inflow permitting state and opens in the inflow blocking state.

In this section, the "valve" can be configured as, for example, a manually operated valve, an electromagnetically operated valve, or a pilot operated switching valve.

(14) A particle coating method in which a plurality of particles are sprayed onto a target surface for coating.
A solution heating step of heating a volatile spray liquid in which a plurality of particles are mixed in a dispersed state, and
A gas heating process that heats compressed gas using a heater,
A spraying step in which the heated compressed gas is supplied to a spray gun together with the heated spray liquid, whereby the spray liquid is atomized using the compressed gas and sprayed from the spray gun. Particle coating method including.

(15) A particle coating method in which a plurality of particles are sprayed onto a target surface for coating.
A solution heating step of heating a volatile spray liquid in which a plurality of particles are mixed in a dispersed state, and
A gas heating process that heats compressed gas using a heater,
In the spraying step, the heated compressed gas is supplied to the spray gun together with the heated spray liquid, whereby the spray liquid is atomized using the compressed gas and sprayed from the spray gun. Therefore, the spray gun selectively switches between an inflow permitting state that permits the inflow of the compressed gas and an inflow blocking state that blocks the inflow of the compressed gas.
A gas supply step of supplying the compressed gas to the heater regardless of whether the spray gun is in the inflow permitted state or the inflow blocked state.
A particle coating method including a gas release step of releasing compressed gas that has passed through the heater to the atmosphere when the spray gun is in the inflow blocking state at least among the inflow permitting state and the inflow blocking state.

According to this method, basically the same effect can be obtained according to the same principle as the method according to the above item (5).

According to the present invention, the following aspects are also obtained.

(Aspect 1) A particle coating device for spraying and coating a plurality of particles on a target surface of an object to be coated.
A tank containing a volatile solution in which the plurality of particles are dispersed in a volatile solvent, and a tank.
A microbubble generator that generates multiple microbubbles in the solution contained in the tank,
A solution heating device that heats the solution mixed with the plurality of microbubbles, and
When the warmed solution is supplied, it includes a spray gun that sprays the solution.
The spray gun
A spray liquid injection port that injects the heated solution in which the plurality of microbubbles are mixed as a spray liquid, and
When the spray liquid injected from the spray liquid injection port has a conical surface whose diameter increases as the spray liquid advances in the traveling direction as a diffusion surface and the spray liquid sprayed from the spray liquid injection port is passed through the diffusion surface, A diffuser that thins the spray liquid layer formed on the diffusion surface by the diffusion surface, thereby bursting the plurality of microbubbles in the spray liquid while the spray liquid passes through the diffusion surface.
A heater for compressed gas that heats the compressed gas,
The heated compressed gas is injected into the spray space, and the injected compressed gas and the spray liquid sprayed from the spray liquid injection port are merged, whereby the spray liquid is sprayed from the spray liquid injection port. A compressed gas injection port that promotes atomization of the spray liquid
Warm air, which is hotter than the surrounding space surrounding the spray space from the side, is sprayed so as to form a warm air shield having an annular cross section surrounding the spray space from the side, thereby forming the spray space. Promotes heat retention in the spray, thereby vaporizing the volatile components in the spray before reaching the target surface, causing the plurality of particles to disperse and float in the air without aggregating with each other. A particle coating device including a warm air shield forming device that facilitates reaching the target surface in a state.

(Aspect 2) The particle coating apparatus according to Aspect 1, wherein the plurality of particles carry metallic silver particles in a state of being exposed on their respective surfaces.

(Aspect 3) A particle coating method in which a plurality of particles are sprayed onto a target surface of an object to be coated.
A microbubble generation step of generating a plurality of microbubbles in a volatile solution in which the plurality of particles are mixed in a volatile solvent in a dispersed state and contained in a tank.
A solution heating step of heating the solution mixed with the plurality of microbubbles, and
Including the supply process of supplying the warmed solution to the spray gun,
The spray gun has a spray liquid injection port, a diffuser, a compressed gas injection port, and a warm air shield forming device.
The method further
The heated solution supplied to the spray gun, in which the plurality of microbubbles are mixed, is sprayed as a spray liquid from the spray liquid injection port, and the sprayed spray liquid is sprayed. By passing through the diffusion surface of the diffuser having a conical surface as a diffusion surface that expands in the traveling direction of the liquid, the spray liquid layer formed on the diffusion surface is thinned, thereby thinning the spray liquid. A spray liquid injection step of bursting the plurality of microbubbles in the spray liquid while passing through the diffusion surface.
The compressed gas is heated, and the heated compressed gas is injected into the spray space from the compressed gas injection port, whereby the injected compressed gas and the spray injected from the spray liquid injection port are injected. A compressed gas injection step of merging the liquids and thereby promoting atomization of the spray liquid.
The warm air shield forming device injects warm air, which is hotter than the surrounding space surrounding the spray space from the side, so as to form a warm air shield having an annular cross section surrounding the spray space from the side. Thereby, the heat retention in the spray space is promoted, whereby the volatile components in the spray liquid are vaporized before reaching the target surface, and the plurality of particles do not agglomerate with each other. A particle coating method comprising a warm air shield forming step that promotes reaching the target surface in a dispersed and suspended state in the air.

(Aspect 4) The particle coating method according to Aspect 3, wherein the plurality of particles carry metallic silver particles in a state of being exposed on their respective surfaces.

(Aspect 5) A particle coating device for spraying and coating a plurality of particles on a target surface.
A first heater that heats a spray liquid in which the plurality of particles are dispersed in a volatile solvent to a first temperature, and
A second heater that heats the compressed gas to a second temperature that is equal to or higher than the first temperature, and
When the heated spray liquid is supplied together with the heated compressed gas, the spray gun includes a spray gun that sprays the spray liquid into the spray space using the compressed gas.
The spray gun
Heater safety provided between the second heater and the spray gun, supplying a part of the compressed gas supplied from the second heater to the spray gun and releasing another part to the atmosphere. With the device
A spray liquid injection port for spraying the heated spray liquid into the spray space,
A compressed gas injection port that injects the heated compressed gas into the spray space,
When the spray gun is viewed from the front, warm air is arranged at a position laterally deviated from the spray liquid injection port and the compressed gas injection port, and is hotter than the surrounding space surrounding the spray space from the side. A particle coating device comprising a warm air injection port that injects forward, thereby forming a warm air shield having an annular cross section that surrounds the spray space from the side.

(Aspect 6) A particle coating device for spraying and coating a plurality of particles on a target surface.
A first heater that heats a spray liquid in which the plurality of particles are dispersed in a volatile solvent to a first temperature, and
A second heater that heats the compressed gas to a second temperature that is equal to or higher than the first temperature, and
When the heated spray liquid is supplied together with the heated compressed gas, the spray gun includes a spray gun that sprays the spray liquid into the spray space using the compressed gas.
The spray gun
A spray liquid injection port for spraying the heated spray liquid into the spray space,
A compressed gas injection port that injects the heated compressed gas into the spray space,
When the spray gun is viewed from the front, warm air is arranged at a position laterally away from the spray liquid injection port and the compressed gas injection port, and is hotter than the surrounding space surrounding the spray space from the side. And thereby forming a warm air shield having an annular cross section that surrounds the spray space from the side.
A first passage provided between the second heater and the compressed gas injection port and supplying a part of the heated compressed gas to the compressed gas injection port.
A particle coating device provided between the second heater and the warm air injection port and including a second passage for supplying another part of the heated compressed gas to the warm air injection port.

(Aspect 7) The first temperature is in the range of 30 ° C. to 50 ° C.
The particle coating apparatus according to aspect 5 or 6, wherein the second temperature is in the range of 50 ° C. to 70 ° C.

(Aspect 8) The particle coating apparatus according to any one of aspects 5 to 7, wherein the temperature of the spray liquid after spraying the spray gun does not rise above the temperature before spraying the spray gun.

It is a system diagram which conceptually shows the structure of the photocatalyst particle coating apparatus according to 1st Embodiment of this invention. It is a side sectional view which shows the head of the spray gun shown in FIG. 1 in an enlarged manner. It is a front view which shows the head shown in FIG. 4 (a) is a side view for schematically explaining the operation of the spray gun shown in FIG. 1, and FIG. 4 (b) is a front view showing the spray gun shown in FIG. 4 (a). .. It is a side view which shows the spray gun shown in FIG. 1 enlarged. It is a functional block diagram that conceptually represents the structure of the solution heating device shown in FIG. FIG. 5 is an enlarged side sectional view showing the heater safety device shown in FIG. 1. It is a side sectional view which shows the main part of the head shown in FIG. 2 in an enlarged manner. It is a process diagram which shows the coating start processing of the photocatalyst particle coating apparatus shown in FIG. It is a process diagram which shows the coating end processing of the said photocatalyst particle coating apparatus shown in FIG. It is a process drawing which shows the said photocatalyst particle coating method. It is an enlarged front view which shows the antibacterial fine particle coated by the photocatalyst particle coating method. It is a conceptual diagram for demonstrating the principle that antibacterial fine particles are coated on a target surface by the said photocatalyst particle coating method. It is another conceptual diagram for demonstrating the principle that antibacterial fine particles are coated on a target surface by the said photocatalytic particle coating method. It is a conceptual diagram for demonstrating the principle that antibacterial fine particles are attached to a target surface by a conventional method. It is a conceptual diagram for demonstrating the principle that antibacterial fine particles are attached to a target surface by the said photocatalyst particle coating method. It is a conceptual diagram for demonstrating how a plurality of antibacterial fine particles are uniformly adhered to a target surface with high density by the said photocatalyst particle coating method. It is a conceptual diagram for demonstrating how a plurality of antibacterial fine particles are uniformly adhered to a target surface with high density by the said photocatalyst particle coating method.

Hereinafter, some of the more specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a system diagram conceptually showing the configuration of a photocatalytic particle coating device (hereinafter, simply referred to as “coating device”) 10 according to an embodiment of the present invention. The coating device 10 is used to carry out a method of spraying a plurality of antibacterial fine particles onto a target surface for coating.

In the present embodiment, the "antibacterial fine particles" are an example of the photocatalytic particles and an example of the particles. The antibacterial fine particles are used in order to positively utilize the antibacterial property among several properties of the photocatalytic particles. In this embodiment, each antibacterial fine particle carries metallic silver particles on its surface. Metallic silver particles, in combination with antibacterial fine particles, improve antibacterial activity.

In the present embodiment, antibacterial fine particles supporting metallic silver particles, that is, silver-supported titanium dioxide are used, and a method for producing this type of antibacterial agent is disclosed in, for example, Japanese Patent Application Laid-Open No. 2001-81409. The gazette is incorporated herein by reference. Further, this type of antibacterial agent is, for example, an antibacterial agent (trade name: "Hikari Gintech") developed by Daido Steel Co., Ltd. Further, this kind of antibacterial agent may be of any kind as long as it can be charged.

The coating device 10 can be used for coating a semi-dry coating film formed on the surface of an object to be coated with a plurality of antibacterial fine particles (hereinafter, simply referred to as "particles"). Further, the coating device 10 can also be used for applying a plurality of particles to the surface of the binder after applying the binder to the completely dry target surface.

First, the configuration of the coating device 10 will be described with reference to FIGS. 1 to 8.

As shown in FIG. 1, the coating device 10 is used to coat a plurality of particles on a target surface by wet and spraying.

Specifically, the coating device 10 uses a spray liquid (hereinafter, referred to as "alcohol solution") in which compressed air is mixed in a dispersed state in ethyl alcohol, which is an example of a volatile medium. It is used together to feed the spray gun 12 and thereby atomize the alcohol solution with compressed air and eject it from the spray gun 12 into the spray space. The spray space is a space located in front of the spray gun 12.

In the present embodiment, the "alcohol solution" is an example of the volatile spray solution, and the "compressed air" is an example of the compressed gas.

As shown enlarged in FIG. 2, the spray gun 12 is a hand-held type that is held and used by an operator's hand, and hangs down from a horizontally extending main body portion 14 and a rear end portion of the main body portion 14. It has a grip 16.

This spray gun 12 is disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-267960, which is incorporated herein by reference.

As shown in FIG. 2, the spray gun 12 has a nozzle 20 for injecting an alcohol solution into the injection space at the head 18 which is the front end portion of the main body portion 14. The nozzle 20 has a center line. The nozzle 20 has a spray liquid outlet 20a (which constitutes an example of the spray liquid injection port). The diameter of the outlet 20a is, for example, in the range of about 0.8 to about 1.6 mm.

The pressure at which the spray gun 12 sprays the alcohol solution from the nozzle 20 is, for example, in the range of about 0.5 to about 1.5 kg / cm ² .

As shown in FIGS. 2 and 4B, the spray gun 12 is a plurality of air injection holes 22 for injecting compressed air into the injection space at the head 18, and is the center line of the nozzle 20. It has those arranged at substantially equal intervals along a circumference coaxial with the (each constituting an example of the compressed gas injection port). The pressure at which the spray gun 12 injects compressed air from each air injection hole 22 is, for example, in the range of about 1.5 to about 3.0 kg / cm ² .

As shown in FIGS. 2 and 4B, the spray gun 12 is a plurality of air injection holes 23 for injecting compressed air into the injection space at the head 18, and is the center line of the nozzle 20. A plurality of positions deviating from the position of the air injection hole 22 so as to be radially outwardly arranged with respect to the center line of the nozzle 20 (each of which is another example of the compressed gas injection port). Consists of). The pressure at which the spray gun 12 injects compressed air from each air injection hole 23 is, for example, in the range of about 1.5 to about 3.0 kg / cm ² .

The plurality of air injection holes 22 and 23 also have a function of promoting atomization of the spray liquid injected from the nozzle 20, but the plurality of air injection holes 22 are generally parallel to the direction of the spray liquid injected from the nozzle 20. The plurality of air injection holes 23 are oriented so as to inject compressed air so as to intersect the spray liquid injected from the nozzle 20 at generally the same angle, whereas the plurality of air injection holes 23 are oriented so as to inject compressed air. ing. The compressed air injected from the air injection holes 23 and the spray liquid injected from the nozzle 20 generally merge with each other at the same position.

As shown in FIGS. 1 to 3, the spray gun 12 further includes a warm air shield forming device 24 at the head 18. The warm air shield forming device 24 has a function of forming a warm air shield by injecting warm air. The warm air shield forming device 24 executes the above-mentioned warm air shield forming step. The details of the warm air shield forming device 24 will be described in detail later.

As shown in FIGS. 2 and 8, the spray gun 12 further has a diffuser 25 at the head 18. The diffuser 25 has a function of diffusing the spray liquid sprayed from the nozzle 20. The details of the diffuser 25 will also be described in detail later.

The spray gun 12 further includes a regulating valve (not shown) for adjusting the amount of alcohol solution ejected from the nozzle 20 and an air passage (not shown) for supplying compressed air to the air injection holes 22 and 23. ) And an air valve (not shown) for opening and closing the air passage.

As shown in FIG. 5, the spray gun 12 further includes a trigger 25 operated by an operator and a trigger guard 26 guarded by the trigger 25. The adjusting valve and the air valve are each mechanically linked to the operation of the trigger 25 via a link mechanism (not shown).

The spray gun 12 selectively switches between an inflow permitting state that allows the inflow of the alcohol solution into the nozzle 20 and the inflow of the compressed air into the air injection holes 22 and 23, and an inflow blocking state that blocks the inflow. When the trigger 25 is pulled by the operator, the spray gun 12 switches from the inflow prevention state, which is the initial state, to the inflow permission state, and then, when the operation of the trigger 25 is released, the inflow permission state is changed to the inflow prevention state. Restore to.

The spray gun 12 further makes it possible that the atomized alcohol solution ejected from the nozzle 20, that is, a plurality of particles (droplets) of the alcohol solution have the same polarity (positive in the present embodiment). A charging device (not shown) having an electrode (not shown) for charging the alcohol is provided. The voltage used by the charging device is, for example, in the range of about 25 to about 60 kV.

Therefore, as shown in FIG. 5, the spray gun 12 takes in the hose connection port 30 for taking in the alcohol solution from the outside and the compressed air from the outside, and finally brings the compressed air into the air injection holes 22 and 23. An air connection port 32 for supplying air, an air connection port 33 for taking in compressed air from the outside and finally supplying the compressed air to the warm air shield forming device 24, and a cable connection for taking in electricity from the outside. It has a mouth 34.

As shown in FIG. 1, the spray gun 12 is connected to one end of a flexible hose 36 through which an alcohol solution flows at a hose connection port 30. At the other end of the hose 36, a solution heating device 40 for heating an alcohol solution, a pressure pump 42, and a material tank 44 are connected in series in that order.

The material tank 44 contains an alcohol solution containing a plurality of particles in a dispersed state under pressure. The alcohol solution contained in the material tank 44 is, for example, 100 weight by weight of alcohol so that the particles are not too dilute to obtain a practical antibacterial action and the particles are not too thick to aggregate and settle with each other. It is adjusted to contain about 0.1 to about 3.0 parts by weight of particles per part. In order to realize both the practical antibacterial action of the particles and the appropriate dispersibility, the alcohol solution contained in the material tank 44 is, for example, about 0.2 to about 0.6 with respect to 100 parts by weight of alcohol. It is desirable to adjust so that it contains parts by weight of particles.

The pump 42 is a so-called circulation type, which is operated by the electric power supplied from the main power source 50, thereby pressurizing the material tank 44 (for example, the upper space in the material tank 44), thereby the material tank. The alcohol solution is extruded from 44 (eg, the bottom of the material tank 44) and supplied to the solution warmer 40. As a result, the alcohol solution is supplied to the hose 36 connection port 30 of the spray gun 12 under pressure. The solution heating device 40 is also operated by the electric power supplied from the main power source 50.

As shown in FIG. 1, a microbubble generator 48 is mounted on the material tank 44. The micro-bubble generator 48 is also operated by the electric power supplied from the main power source 50. The micro-bubble generator 48 takes in air from the outside and mixes the air with the alcohol solution taken in from the material tank 44 by a pump, whereby the air is introduced into the alcohol solution with a diameter of 0.1 to 0. It is mixed into a plurality of 01 mm bubbles in an ultrafine state. It is desirable that the alcohol solution contained in the material tank 44 is adjusted so as to contain, for example, about 5 to about 10 parts by volume of microbubbles with respect to 100 parts by volume of alcohol.

As conceptually represented by a block diagram in FIG. 6, the solution heating device 40 includes a solution heater 52 for heating the alcohol solution supplied from the pressure feed pump 42, and alcohol heated by the solution heater 52. It includes a solution temperature controller 54 for controlling the temperature of the solution (hereinafter, referred to as “solution temperature”) and a solution temperature sensor 56 for detecting the solution temperature.

It is desirable that the solution temperature sensor 56 be arranged in the solution heater 52 at the most downstream position of the solution passage through which the alcohol solution flows or at a position near the downstream position in order to detect the solution temperature with high accuracy.

The solution temperature controller 54 monitors the solution temperature detected by the solution temperature sensor 56 so that the actual value of the solution temperature is within an allowable range of the current between the solution heater 52 and the main power supply 50. Control the flow. The solution temperature controller 54 controls the on / off state of the solution heater 52 so that the solution temperature is in the range of, for example, about 30 to about 50 ° C.

As shown in FIG. 1, the spray gun 12 is connected to the heater safety device 60 and the air heater 62 for heating the compressed air in this order at the air connection port 32. Further, the spray gun 12 is connected to the hose 63, the heater safety device 60, and the air heater 62 in this order at the air connection port 33. The compressed air heated by the air heater 62 is supplied to both the air connection ports 32 and 33, and thus to both the air injection holes 22 and 23 and the warm air shield forming device 24.

In the present embodiment, the heater safety device 60 and the air heater 62 are integrally attached to the spray gun 12. Therefore, the operator will move the spray gun 12 by hand together with the heater safety device 60 and the air heater 62. That is, the air heater 62 is not an installation type installed in a work place, but a portable type (movable type) that moves together with an operator.

As described above, in the present embodiment, since the air heater 62 is attached to the spray gun 12 without passing through a long hose, it is warmed more than when it is attached to the spray gun 12 via a hose. While the compressed air moves from the air heater 62 to the spray gun 12, the amount of decrease in the temperature of the compressed air due to heat transfer or the like is reduced.

Further, in the present embodiment, since the air heater 62 is not built in the spray gun 12 but is externally attached, the temperature of the spray gun 12 itself held by the operator is higher than that in the case where the air heater 62 is built in. The rise is suppressed. This also improves the safety of the operator.

The configuration of the air heater 62 alone is disclosed, for example, in JP-A-9-277040, which is incorporated herein by reference.

As shown enlarged in FIG. 7, the air heater 62 has a hollow heat generating portion 64. Although not shown, the heat generating portion 64 is configured by connecting an inner cylinder and an outer cylinder coaxial with each other by a pair of annular side plates facing each other in the axial direction. A coiled nichrome wire as a heat generating element that converts electric energy into heat energy is coaxially arranged in a tubular space inside the heat generating portion 64.

The air heater 62 further has an air passage 66 that coaxially penetrates the center of the heat generating portion 64 in a circular cross section. Compressed air flows in the air passage 66 in one direction from the upstream side to the downstream side while being heated by the heat generating portion 64. Both ends of the heater safety device 60 are connected to the heater outlet 68 of the air passage 66 and the air connection port 32 of the spray gun 12.

The heater safety device 60 includes a main body portion 72 forming the main passage 70, and a branch portion 74 branched from the main body portion 72 and forming a branch passage 76 branched from the main passage 70. .. Both ends of the main passage 70 are connected to the air connection port 32 and the heater outlet 68, respectively. The tip of the branch passage 76 is open to the atmosphere.

Although not shown in FIG. 7, as is clear from FIG. 1, the central portion (or other portions) of the main passage 70 is connected to one end of the hose 63, and the other end of the hose 63 is connected. , As shown in FIG. 1, is connected to the air connection port 33. As a result, the compressed air heated by the air heater 62 is supplied not only to the air connection port 32 but also to the air connection port 33.

Therefore, when the compressed air passes through the air heater 62 because the spray gun 12 is in the inflow permitted state, the compressed air is supplied to the spray gun 12 via the main passage 70. At this time, a part of the compressed air that has passed through the air heater 62 is released to the atmosphere through the branch passage 76.

On the other hand, when the spray gun 12 shifts to the inflow blocking state (the air heater 62 is turned off accordingly), the compressed air is nevertheless continued to be supplied to the air heater 62 as described later. Therefore, all of the compressed air that has passed through the air heater 62 is discharged to the atmosphere through the branch passage 76. As a result, the air heater 62 is forcibly air-cooled.

As shown in FIG. 1, the air heater 62 is connected to the compressor 82 at the inlet 78 of the air passage 66 via a flexible hose 80. The compressor 82 is operated by the electric power supplied from the main power source 50, thereby sucking in the surrounding air and supplying it as compressed air to the air heater 62.

The compressor 82 is not linked to the trigger 25 of the spray gun 12, and even if the operation of the trigger 25 is released, as long as the power of the compressor 82 is on, the compressor 82 sends the compressed air to the air heater 62. Continue to supply.

As shown in FIG. 1, the air heater 62 includes an air temperature sensor (for example, a thermocouple) 84 that detects the temperature of the compressed air heated by the air heater 62 (hereinafter, referred to as “air temperature”). It is installed.

It is desirable that the air temperature sensor 84 is arranged at the most downstream position of the air passage 66 in the air heater 62 or at a position near the downstream position in order to detect the air temperature with high accuracy.

As shown in FIG. 1, the air temperature controller 90 is electrically connected to the air heater 62 and the air temperature sensor 84. The air temperature controller 90 monitors the air temperature detected by the air temperature sensor 84 so that the actual value of the air temperature is within an allowable range, so that the current between the air heater 62 and the main power source 50 is maintained. Control the flow of. The air temperature controller 90 controls the air heater 62 so that the air temperature is, for example, in the range of about 50 to about 70 ° C.

As shown in FIG. 1, the spray gun 12 is connected to the electrostatic generator 94 at the cable connection port 34 via the electric cable 90. The electrostatic generator 94 is operated by the electric power supplied from the main power source 50, thereby generating a positive charge (a negative charge is also possible) and supplying the generated charge to the electrodes of the charging device. To do.

Here, an example of the warm air shield forming apparatus 24 will be specifically described with reference to FIGS. 2 to 4.

First, to explain the function, the warm air shield forming device 24 blows warm air, which is hotter than the peripheral space AS that surrounds the spray space SS set in front of the head 18 from the side, on the side of the spray space SS. It is sprayed so as to form a warm air shield HSD having an annular cross section that surrounds it from the side, thereby promoting heat retention in the spray space SS.

Next, to explain the configuration for realizing the function, the warm air shield forming device 24 has a main body portion 200 mounted on the head 18. The main body 200 has an annular shape, and is attached to the outer housing 202 of the head 18 so as to surround the outer housing 202 from the side.

The main body 200 has a plurality of nozzles 210 arranged along a circumference coaxial with the nozzle 20. The main body 200 is shown in FIGS. 4A and 4B by injecting warm air from the outlet 212 of each nozzle 210 (which constitutes an example of the hot air injection port) in front of the head 18. As described above, the warm air shield HSD is formed.

As shown in FIG. 3, the main body 200 has a communication passage 214 for communicating a plurality of nozzles 210 with each other, and the communication passage 214 communicates with the air connection port 33. The communication passage 214 extends along a circumference concentric with the outer housing 202 so as to surround the outer housing 202 of the head 18 from the side.

As shown in FIG. 4, the plurality of nozzles 210 are arranged at equal angular intervals along one circumference. The center line of each nozzle 210 can be oriented so as to extend in a direction parallel to the center line of the nozzle 20, but instead, in a direction non-parallel to the center line of the nozzle 20. It can be oriented to extend. For example, the center lines of the plurality of nozzles 210 can be oriented so as to be divergent in cooperation with each other, or can be oriented so as to be tapered in cooperation with each other.

The diameter of the outlet of each nozzle 210 is, for example, in the range of about 1.0 to about 2.0 mm. Further, the pressure at which the spray gun 12 injects compressed air from each nozzle 210 is, for example, in the range of about 1.5 to about 3.0 kg / cm ² .

In an example in which each nozzle 210 is oriented so as to extend in a direction parallel to the nozzle 20, a tubular warm air shield HSD is formed. On the other hand, in the example in which each nozzle 210 is oriented so as to increase the distance from the center line of the nozzle 20 as it moves parallel to the nozzle 20 in the direction away from the nozzle 20, FIG. As shown in a), a divergent warm air shield HSD is formed.

Next, the thermodynamic effect of the warm air shield HSD will be described.

First, the temperature of the warm air shield HSD is higher than that of the peripheral space AS, as compared with the temperature of the peripheral space AS.

Next, in order to explain the phenomenon that occurs in the spray space SS prior to the comparison with the temperature of the spray space SS, a plurality of compressed airs that are the same as the warm air forming the warm air shield HSD are present in the spray space SS. Since it is injected from the air injection holes 22 and 23, the temperature may be higher than that of the ambient air AS. However, since the spray liquid (alcohol solution) ejected from the nozzle 20 is a volatile alcohol solution, the spray liquid is atomized and vaporized at the same time during the flight. Therefore, the heat of vaporization is taken from the air in the spray space SS, and as a result, the temperature of the spray space SS may not be as high as that of the warm air shield HSD.

Then, as a result of the spray space SS being surrounded by the warm air shield HSD from the side, the temperature of the spray space SS rises as compared with the case where the warm air shield HSD does not exist. The higher the temperature of the spray space SS, the more heat of vaporization can be applied to the spray liquid, and as a result, the distance required to fly before the spray liquid vaporizes is shortened.

Then, the volatile components in the spray liquid are substantially completely vaporized before the plurality of fine particles contained in the spray liquid reach the target surface to be coated, and only the plurality of fine particles are allowed to evaporate from each other. It is promoted to reach the target surface in a state of being dispersed in each other and floating in the air without agglomeration.

Next, an example of the diffuser 25 will be specifically described with reference to FIGS. 2 and 8.

First, to explain the function, the diffuser 25 diffuses the spray liquid ejected from the nozzle 20 by mechanical parts.

Next, to explain the configuration for realizing the function, the diffuser 25 has a cone 300 installed coaxially with the nozzle 20 in front of the outlet 20a of the nozzle 20. The cone 300 has a metal inverted conical surface 302 as a mechanical diffusion surface whose cross-sectional diameter increases as the spray liquid travels away from the outlet 20a of the nozzle 20. The cone 300 is oriented so as to extend coaxially with the nozzle 20, and is arranged at a position having a constant relative position with respect to the outlet 20a of the nozzle 20.

To achieve such an arrangement, the cone 300 is mounted on the head 18 by a positioning member 310. An example of the positioning member 310 is a metal rod extending coaxially with the nozzle 20. The rod is fixedly connected to the head 18.

Next, to explain the action and effect with reference to FIG. 8, the diffuser 25 bites into the central portion of the flow of the spray liquid injected from the nozzle 20 in the opposite direction of the flow of the spray liquid. The spray liquid is advanced along the inverted conical surface 302 of the diffuser 25 so as to form a taper that expands in diameter along the forward direction of the flow. As a result, when the spray liquid is cut at a plurality of virtual planes passing through each of the plurality of virtual points arranged along the center line of the diffuser 25, the cross sections of the spray liquid are concentric with each other. It forms a ring defined by.

The plurality of annular cross sections generated for the spray liquid expand in diameter along the forward direction of the flow. On the other hand, since the flow rate of the spray liquid is constant at any of the virtual points, the area of each annular cross section is also constant. On the other hand, the perimeters of the inner and outer circles of each annular cross section increase in the forward direction of the flow. As a result, the thickness of each annular cross section, i.e. the thickness of the spray liquid layer covering the surface of the diffuser 25, decreases along the forward direction of the flow. That is, the spray liquid layer becomes thinner in the forward direction of the flow.

When the spray liquid layer is thinned in this way, after the spray liquid has exited from the diffuser 25 or is passing through the diffuser 25, the spray liquid has a larger number of fine particles having a smaller diameter in the spray space. The tendency to disperse and become mist increases. On the other hand, the finer the mist particles (fine particles in the mist) of the spray liquid, the easier it is for the fine particles in the mist to vaporize.

As shown in FIG. 8, a plurality of microbubbles are mixed in the spray liquid layer. As a result, the spray liquid tends to be divided into a plurality of segments (the liquid tends to be divided into a plurality of liquid portions by a plurality of bubbles) as compared with the case where such microbubbles are not mixed. Furthermore, as the spray liquid progresses downstream and the thickness of the spray liquid layer approaches the diameter of one microbubble, the tendency of the spray liquid constituting the spray liquid layer to be further divided into a plurality of segments is further strengthened. Will be done.

When a plurality of microbubbles are mixed in the spray liquid in this way, the tendency of the spray liquid to divide increases, and the microbubbles burst after the spray liquid has exited the diffuser 25 or is passing through the diffuser 25. In the spray space, the spray liquid tends to be dispersed in a larger number of fine particles having a smaller diameter and become mist. On the other hand, as described above, the finer the fine particles (fine particles in the mist) of the mist of the spray liquid (hereinafter referred to as "spray mist"), the easier it is for the fine particles in the mist to evaporate.

As is clear from the above description, in the present embodiment, the diffusion effect of the spray liquid by the diffuser 25, the division effect of the spray liquid by mixing a plurality of microbubbles in the spray liquid, and the spray space by the warm air shield. In collaboration with the heat retaining effect of the above, the miniaturization of each of the plurality of fine particles in the mist constituting the spray mist is promoted. This promotes a reduction in the complete vaporization time of each particle, that is, a reduction in the flight distance that the spray liquid must fly in the spray space in order for the spray liquid to completely vaporize.

Next, the operation of the coating device 10 will be described with reference to FIGS. 9 to 11.

As shown in FIG. 9, in order to start the coating operation, the operator first turns on the main power supply 50 in step S1, then turns on the compressor 82 in step S2, and then in step S3. At, the air temperature controller 90 is turned on. The operator then turns on the pump 42 in step S4 and subsequently turns on the solution warmer 40 in step S5. With the above, the coating device 10 shifts to the standby state.

When the operator has not yet pulled the trigger 25 of the spray gun 12, the determination in step S6 becomes NO, and in step S7, the spray gun 12 is maintained in the inflow blocking state. On the other hand, when the operator pulls the trigger 25 of the spray gun 12, the determination in step S6 becomes YES, and in step S8, the spray gun 12 shifts to the inflow permission state.

As a result, in step S9, the compressed air heated by the air heater 62 is supplied to the spray gun 12 together with the alcohol solution heated by the solution heater 52. As a result, the alcohol solution is atomized using compressed air and sprayed from the spray gun 12 toward a target surface (not shown).

After that, when the operator releases the trigger 25 of the spray gun 12, the spray gun 12 is restored to the inflow blocking state, whereby the spraying of the alcohol solution is completed.

As shown in FIG. 10, the operator first turns off the air temperature controller 90 in step S11 in order to finish the coating operation. As a result, the power supply from the main power source 50 to the air heater 62 is cut off. However, there is residual heat in the air heater 62. Next, the operator turns off the pressure pump 42 in step S12, and subsequently turns off the solution warming device 40 in step S13.

At the present time, the compressor 82 continues to operate, and all of the compressed air that has passed through the air heater 62 is discharged to the atmosphere from the branch passage 76, as shown in FIG. As a result, the compressed air is used for air cooling, which is not the original purpose, and the air heater 62 is forcibly air-cooled. As a result, the temperature of the air heater 62 quickly returns to room temperature, and the air heater 62 is not unnecessarily heated.

When the operator determines that the cooling of the air heater 62 is completed as described above, the determination in step S14 becomes YES, and the operator turns off the compressor 82 in step S15. As a result, the supply of compressed air to the air heater 62 is stopped. Subsequently, the operator turns off the main power supply 50 in step S16. With the above, the coating work is completed, whereby the coating device 10 is restored to the initial state.

FIG. 11 shows a plurality of steps performed when the coating operation is performed using the coating device 10 over time.

First, there is a solution heating step S101 that heats an alcohol solution in which a plurality of particles are mixed in a dispersed state. Further, there is a gas supply step S102 that supplies compressed air to the air heater 62 regardless of whether the spray gun 12 is in the inflow permitted state or the inflow blocked state. Further, there is a gas heating step S103 that heats the supplied compressed air by using the air heater 62.

Further, there is a gas release step S104 that releases the compressed air that has passed through the air heater 62 to the atmosphere in at least the inflow blocking state of the inflow permitting state and the inflow blocking state of the spray gun 12.

Further, the spraying step S105 of supplying the heated compressed air together with the heated alcohol solution to the spray gun 12, thereby atomizing the alcohol solution using the compressed air and injecting it from the spray gun 12. Exists. The spraying step S105 has a charging step S106 that charges a plurality of particles in the spray gun 12 so as to have the same polarity with each other.

Next, by referring to FIGS. 12 to 18, the coating method implemented using the coating device 10 and the antibacterial effect of the coated antibacterial agent fine particles will be described by focusing on the behavior of the antibacterial agent fine particles. To do.

In FIG. 12, the outer shape of one antibacterial agent fine particle (also referred to as “antibacterial fine particle”) is enlarged and conceptually shown. The diameter of the antibacterial agent fine particles is about 80 nm (for example, about 80 to about 100 nm). Since the diameter of the antibacterial agent fine particles is nano-sized as described above, the total surface area of a plurality of antibacterial agent fine particles having the same total weight is increased as compared with the case where the diameter is smaller than that. This contributes to the improvement of the antibacterial effect.

As described above, the antibacterial agent fine particles carry a plurality of metallic silver particles on the surface of the antibacterial agent fine particles. Antibacterial agent fine particles cannot act as a catalyst unless they receive light, whereas metallic silver exerts an antibacterial action without requiring light. Therefore, metallic silver enhances the catalytic action of the antibacterial agent fine particles.

As conceptually shown in FIG. 13, the alcohol solution sprayed from the spray gun 12 vaporizes during flight, and after the vaporization is completed, a plurality of antibacterial agent fine particles (in the present embodiment, are positively charged). Will reach the target surface. In the present embodiment, the target surface is the surface of a coating film baked and applied on the surface of the object to be coated, and in a semi-dry state, a plurality of antibacterial agent fine particles adhere to the coating film. Be done.

In the present embodiment, prior to the supply of the alcohol solution and the compressed air to the spray gun 12, the alcohol solution ejected from the spray gun 12 evaporates substantially completely before reaching the target surface. The alcohol solution and the compressed air are heated to a temperature at which the heating of the alcohol solution and the heating of the compressed air are jointly realized.

Specifically, as described above, in the present embodiment, the compressed air has a temperature equal to or higher than the temperature at which the alcohol solution is heated (about 30 to about 50 ° C.) (about 50 to about 70 ° C.). It is heated to ℃).

As a result, according to the present embodiment, after being sprayed by the spray gun 12, the alcohol solution completely evaporates by the time it reaches the target surface, and as a result, a plurality of alcohol solutions contained in the original alcohol solution. It is guaranteed that all of the antimicrobial particles of the above, each alone, will be allowed to fly in the air and reach the target surface in that state. The minimum flight distance (spray distance) that the alcohol solution must fly in order for the volatile medium to vaporize substantially completely before the plurality of antimicrobial particles reach the target surface is, for example, about 50 to. It is about 60 cm.

As conceptually shown in FIG. 14, the morphology of the alcohol solution sprayed from the spray gun 12 changes with time in the process of reaching the target surface.

Immediately after being sprayed from the spray gun 12, the alcohol solution is in the form of a mist and exists as a collection of a plurality of particles (droplets). In each particle, a plurality of positively (or negative) charged particles are agglomerated with each other.

As described above, in the present embodiment, not only the alcohol solution but also the compressed air is heated prior to the supply to the spray gun 12. Therefore, alcohol evaporates from each grain, and the plurality of antibacterial agent fine particles are released from the binding by the grains. As a result, the plurality of antibacterial agent fine particles are dispersed with each other.

Then, in the present embodiment, since all the antibacterial agent fine particles are charged to the same electrode, they repel each other electrostatically. As a result, the antibacterial agent fine particles intensify the tendency to disperse with each other. The antibacterial agent fine particles adhere to the surface of the semi-dry coating film in a densely and uniformly dispersed state.

In one conventional example, as shown in FIG. 15, the surface of each antibacterial agent fine particle is coated with a liquid binder prior to adhesion to the surface of the object to be coated, which is the target surface. When it adheres to the target surface and is dried, each antibacterial agent fine particle adheres to the target surface, but the binder unexpectedly remains on the surface of each antibacterial agent fine particle. As a result, the effective surface area (effective exposed area) of each antibacterial agent fine particle is reduced. In the residual binder, each antibacterial agent fine particle interferes with contact with an object to be subjected to the antibacterial action, and the antibacterial action of each antibacterial agent fine particle is reduced.

On the other hand, in the present embodiment, as conceptually shown in FIG. 16, each antibacterial agent fine particle locally adheres to the surface of a semi-dry coating film (undercoat coating film) without coating with a binder. .. The coating film may be positively charged or negatively charged regardless of the polarity of the charge of each antibacterial agent fine particle to be attached, as long as the entire coating film has the same potential.

Due to the joint action of the pressure when sprayed on the coating film surface and the surface tension of the coating film, the coating film rises near the contact point with each antibacterial agent fine particle, and each antibacterial agent fine particle locally bites into the coating film. .. It is avoided that each antibacterial agent fine particle is completely buried in the coating film.

After that, the process shifts to the baking effect / drying process of the coating film, and in that process, each antibacterial agent fine particle is drawn into the coating film. As a result, an integrated coating film in which a plurality of antibacterial agent fine particles are integrated with the coating film is formed.

As is conceptually shown in the cross-sectional view enlarged in FIG. 17, the coating film is half on the target surface, that is, the surface of the coating film on which the surface of the object to be coated is baked. It is attached in a dry state. Eventually, the coating film dries. As a result, the plurality of antibacterial agent fine particles are fixed in a state of locally biting into the coating film. The plurality of antibacterial agent fine particles adhered to the surface of the coating film are adjacent to each other with an interval w of several μ.

As enlarged and conceptually shown in the plan view in FIG. 18, the plurality of antibacterial agent fine particles adhered to the surface of the coating film are dispersed substantially uniformly with each other at intervals w.

As shown in FIG. 18, according to the present embodiment, since the plurality of antibacterial agent fine particles are densely and uniformly dispersed and fixed on the coating film surface, any of the antibacterial agent fine particles on the coating film surface can be used. The area of the non-existent continuous region is reduced as compared with the conventional case in which a plurality of antibacterial agent fine particles aggregate with each other and exist on the coating film surface.

As a result, each bacterium to be killed has a probability of contacting any of the coating film surfaces to which the plurality of antibacterial agent fine particles are attached according to the present embodiment, and the plurality of antibacterial agent fine particles aggregate with each other on the coating film surface. More than if it exists.

According to this embodiment, a plurality of silver-based antibacterial agent fine particles whose effects have been confirmed against fungi, molds and viruses are sprayed so as to adhere to the surface of the coating film in a state of being dispersed with each other at high density. It is applied. Furthermore, these silver-based antibacterial agent fine particles are applied so as not to overlap each other by utilizing the spray pressure of the spray liquid, the surface tension of the coating film, and the static electricity of multiple fine particles of the spray liquid (charged to the same polarity). The silver-based antibacterial agent fine particles are fixed to the coating film in a state where the particles partially bite into the film (leaving the exposed surface).

Therefore, the durability and durability of the silver-based antibacterial agent fine particles are ensured for a long period of time, and the silver-based antibacterial agent fine particles are dispersed and adhered on the coating film at a high density, whereby the silver-based antibacterial agent fine particles are dispersed and adhered. The probability that the agent fine particles come into contact with fungi and the like increases dramatically. As a result, the antibacterial effect, the deodorant effect and the antifungal effect are all highly enhanced and exhibited for a long period of time.

In the embodiment described above, the silver-based antibacterial agent fine particles are adopted as an example of a plurality of particles contained in the spray liquid for the purpose of antibacterial effect, deodorant effect and antifungal effect. Instead of this, for example, metal particles can be adopted as another example of a plurality of particles contained in the spray liquid, for example, for the purpose of electrostatic shielding.

Although some of the embodiments of the present invention have been described in detail with reference to the drawings, these are examples and are based on the knowledge of those skilled in the art, including the embodiments described in the [Summary of Invention] column. It is possible to carry out the present invention in other forms with various modifications and improvements.

Claims (4)

A particle coating device that coats a plurality of particles on a target surface.
A heater that heats the compressed gas and
When the spray liquid in which the plurality of particles are mixed in a volatile solvent in a dispersed state is supplied together with the heated compressed gas, the spray liquid is introduced into the spray space using the compressed gas. With a spray gun to spray
A part of the compressed gas provided between the heater and the spray gun and supplied from the heater is supplied to the spray gun, and another part is released to the atmosphere , whereby the heater is operated. A particle coating device including a heater safety device that forcibly air-cools the heater by passing a compressed gas through the heater in a stopped state . The spray gun selectively switches between an inflow permitting state that permits the inflow of the compressed gas and an inflow blocking state that blocks the inflow of the compressed gas.
The particle coating device according to claim 1, wherein the heater safety device releases compressed gas that has passed through the heater to the atmosphere in at least the inflow blocking state of the inflow permitting state and the inflow blocking state of the spray gun. .. The spray gun is a portable type that can be held and moved by an operator.
The particle coating device according to claim 1 or 2, wherein the heater and the heater safety device are movably mounted on the spray gun integrally with the spray gun. A heater that heats a compressed gas in order to apply a plurality of particles to a target surface, and a spray liquid in which the plurality of particles are mixed in a volatile solvent in a dispersed state are the heated compressed gas. A heater safety device used in a particle coating device including a spray gun that, when supplied together, sprays the spray liquid into the spray space using the compressed gas.
A part of the compressed gas supplied from the heater is supplied to the spray gun, and another part is released to the atmosphere, whereby the compressed gas passes through the heater in the stopped operation state of the heater. A heater safety device that forcibly cools the heater by air.

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