JPH07878A - Method for aerosol spraying and its apparatus - Google Patents

Abstract

PURPOSE:To make a uniform particle adhere stably, rapidly and surely even when the particle diameter of an aerosol is made small. CONSTITUTION:In a method for coating or antistatic removing and cleaning wherein a coating liq. or a pure water is made into an aerosol and is sprayed to an object to be treated, the method is a method for aerosol spraying wherein the aerosol is sprayed under a definite pressure from an opening 3 with a small diameter of a sprayer 2 wherein the aerosol is introduced through a carrying pipe 1 and a gas with a pressure being higher than the spraying pressure of the aerosol is blown up from a jetting opening 4 of a jetting pipe 5 around this opening 3 with a small diameter and the aerosol with the high pressure gas is blown up to the object to be treated 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention applies an antistatic agent, a rust preventive agent, a surface modifier such as an emulsion of a polymer compound, or other appropriate coating liquid to an object to be treated as an aerosol or pure water. The present invention relates to an aerosol spraying method and an apparatus therefor, for example, in which a static electricity is removed by spraying the above as an aerosol onto a charged object to be treated, or the surface of the object to be treated is cleaned.

[0002]

2. Description of the Related Art There is a method in which an appropriate coating liquid such as a surface modifier is made into an aerosol and coated on a workpiece. Further, there is a method for removing static electricity by making pure water into an aerosol and spraying it on a charged object to be treated, as shown in, for example, JP-A-2-203976.

[0003]

In order to speed up these treatments, it is desirable to attach a large amount of aerosol to the object to be treated quickly. However, when the aerosol spraying pressure is increased and the aerosol spraying speed is increased, a two-layer flow phenomenon occurs, and the aerosol is repelled by the air layer (thickness: about 0.3 mm) on the surface of the object to be processed, and the aerosol is processed. Cannot be attached to the surface of. This air layer must be destroyed, but turbulence must be created to destroy it. To create this turbulent flow, the aerosol blowing air pressure must be about 3-8 Kg / cm ² .

However, when the aerosol is generated and ejected at such a high pressure, the particles of the aerosol agglomerate and bond with each other, and the particle diameter becomes unstable. Therefore, it becomes impossible to attach uniform fine particles to the object to be treated. Therefore, it is difficult to destroy the air layer.

Therefore, in the present invention, in the coating method using an aerosol and the static electricity removing or cleaning method using pure water or an aerosol of an antistatic agent as described above, uniform particles can be stably formed even if the particle size of the aerosol is reduced. It is an object of the present invention to provide an aerosol spraying method and a device therefor capable of quickly and surely adhering.

[0006]

According to a first aspect of the present invention, in a coating method in which a coating liquid is made into an aerosol and is sprayed onto an object to be treated, a gas having a pressure higher than the spraying pressure of the aerosol is supplied from the vicinity of the spraying port of the aerosol. For example, air, carbon dioxide gas, inert gas, etc. are blown out. This coating solution is, for example, a solution of a surface modifier such as an antistatic agent, a rust preventive agent, an antifogging agent, a surface curing agent, a surface reflection control agent, a solution of a surface cleaning agent, a surface stain adhesion preventing agent, a surface smoothing agent. , A solution such as a surface anti-slip agent, and other appropriate solutions. Further, the size of the aerosol is about 0.01 μ
It is about 100 μm, and these can be easily transferred to a distant place by blowing air. According to the invention of claim 2, the coating liquid is an antistatic agent solution.

According to a third aspect of the present invention, in a static electricity removing method in which pure water or a solution of an antistatic agent is made into an aerosol and is sprayed on an object to be processed, a pressure higher than the spraying pressure of the aerosol is applied from the vicinity of the spraying port of the aerosol. High-pressure gas such as air is blown out.

Further, the invention of claim 4 relates to an apparatus used in these methods, wherein a transfer pipe for transferring an aerosol such as water or a coating liquid at an appropriate pressure is provided, and a hollow is provided at one end of the transfer pipe. Connect the atomized aerosol spray,
A small-diameter opening is provided by narrowing the opening of the spray body to a small diameter, and a spray pipe having a spray port for spraying a high-pressure gas having a pressure higher than the spray pressure of the aerosol is provided in the spray body. It is provided so as to face the small diameter opening of the sprayer.

Further, the invention according to claim 5 is a coating method or a cleaning method in which water or a coating liquid is made into an aerosol and sprayed onto an object to be treated such as granules, powders, and small molded articles, in a transfer pipe of the object to be treated. At the same time as the aerosol is sprayed onto the substrate, a gas having a pressure higher than the spraying pressure of the aerosol is blown into the transfer pipe to transfer the object to be treated and the aerosol is attached to the object to be treated.

[0010]

According to the first aspect of the invention, when the high-pressure gas blows out from the vicinity of the spraying port of the aerosol, the high-pressure gas hits the surface of the object to be treated while entraining the aerosol. When the high-pressure gas hits the surface of the object to be processed, a turbulent flow is caused by the pressure to blow off the air layer on the surface of the object to be processed, and the suction force of the turbulent flow easily attaches the aerosol to the surface of the object to be processed. be able to. Of course, at that time, dust and dust adhering to the surface of the object to be processed are also blown off. Then, a part of the aerosol is attracted to the decompression layer in the vicinity of the outer surface of the high-pressure gas layer and stands by there, and the aerosol successively adheres to the surface of the object.

The aerosol thus attached to the surface of the object to be treated has its water content vaporized by the high pressure gas sprayed one after another, and a coating film is formed on the surface of the object to be treated. At this time, the pressure of the high-pressure gas promotes the formation of the coating film. That is, the higher the pressure of the high-pressure gas is, the more the vaporization of the attached aerosol is promoted, and the higher the film-forming effect is.

In the method of the second aspect, as in the above method, the aerosol is attached and the water is vaporized to form a coating film comprising an antistatic agent. Therefore, the surface of the object to be treated has an antistatic effect.

According to the invention of claim 3, the above-mentioned claim 1
In the same manner as in the invention of paragraph 1, the high-pressure gas destroys the air layer on the surface of the object to be treated and the aerosol adheres to the surface of the object to be treated, but in this static elimination method, some particles are in the air when the aerosol is sprayed. Being charged, each of these particles has a positive or negative charge. The higher the purity of the water that forms this aerosol, the higher the permittivity, and the greater the amount of polarization charge, which promotes the electrical neutralization effect, while the conductivity is low, which causes a strong charge due to air friction during atomization, which lowers the conductivity. As a result, the positive and negative chargeability is increased and stabilized. The partially charged aerosol is vigorously ejected together with the high-pressure gas, hits and adheres to the surface of the object to be processed, and is evaporated by the temperature of the object to be processed, the high-pressure gas, or the like. In particular, when the object to be treated is higher than room temperature, it works effectively, and evaporation and vaporization are promoted. At this time, the electric charge generated on the surface of the object to be treated and the electric charge of the opposite electrode of the aerosol are neutralized and erased.

Further, in the invention of claim 4, the aerosol is transported at a proper pressure in the transfer pipe and sent into the spray body, and the aerosol is sprayed at a constant pressure from the small diameter opening of the spray body. At this time, a high-pressure gas having a pressure higher than the atomization pressure of the aerosol is ejected from the ejection port of the ejection pipe, so that the aerosol is entrained in the high-pressure gas and ejected together with the high-pressure gas from the small-diameter opening of the atomizer. The high-pressure gas causes a turbulent flow to destroy the air layer on the surface of the object to be treated.

According to the invention of claim 5, granules, powder,
An object to be treated such as a small molded product is transferred in the transfer pipe by the high pressure gas blown from one side to the other side. At the time of this transfer, the aerosol sprayed in the transfer pipe is entrained in the high-pressure gas and adheres to the object to be processed, and at the same time dust and dust on the surface of the object to be processed are blown off by the high-pressure gas, and the surface of the object is processed. To clean.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

First, the first embodiment of the spraying device used in the present invention will be described with reference to FIGS. 1 and 2. A transfer pipe 1 for transferring an aerosol such as water or a coating liquid at an appropriate pressure is provided, and this transfer is performed. A hollow aerosol spraying body 2 is connected to one end of a tube 1, the opening of the spraying body 2 is once narrowed to a small diameter, and a small-diameter opening 3 opened to the outside is provided. In addition, a jet pipe 5 having a jet port 4 for jetting high-pressure air having a pressure higher than the spray pressure of the aerosol is provided in the spray body 2, and the jet port 4 faces the small diameter opening 3 of the spray body 2. It was provided by. And the jet pipe 5
Is connected to one end of a high-pressure air pipe 6 introduced from the outside through the side wall of the transfer pipe 1.

Next, the spraying method will be described by using the apparatus of the present invention. An aerosol generator provided separately forms a solution of the antistatic agent into an aerosol. The particle size of this aerosol is about 1
0 to 30 μm, and these aerosols are transferred in the transfer pipe 1 at an appropriate pressure and sent into the spray body 2.
From the small diameter opening 3 of the aerosol, the aerosol is kept at a constant pressure, for example, 2K.
It is sprayed at g / cm ² . At that time, high-pressure air having a pressure higher than the atomization pressure of the aerosol, 4 to 10 kg / cm ^2, is ejected from the ejection port 4 of the ejection pipe 5. Due to the jetting of the high-pressure air, a negative pressure portion is generated around the high-pressure air in the three small-diameter openings, and the aerosol is sucked into the negative-pressure portion to increase the speed and together with the high-pressure air, the small-diameter openings 3 of the spray body 2 are generated. Gushes from.

Then, the aerosol is rolled up and hits the surface of the object 7 to be treated. When the high-pressure air hits the surface of the object 7 to be processed, a turbulent flow is caused by the pressure to blow away the air layer on the surface of the object 7 to be processed, and the suction force of the turbulent flow easily causes the aerosol to surface the object 7. Can be attached to. Of course, at that time, dust and dust adhering to the surface of the object to be processed 7 are also blown off. Then, a part of the aerosol is attracted to the decompression layer near the outer surface of the high-pressure air layer and stands by there, so that the aerosol adheres to the surface of the object 7 one after another. Furthermore, in that case,
As shown in FIG. 5, a suction device 8 with a filter may be provided on both sides or around the coated surface of the object to be treated 7 to suck dust and dust blown off by the high pressure air so as not to stain the surroundings. .

FIG. 3 shows a second embodiment of the apparatus. In the apparatus of the first embodiment, the jet pipe 5 is provided at the back of the spray body 2 apart from the small diameter opening 3 and the spray body Two
High-pressure air can be jetted inside the container and the aerosol can be entrained in the high-pressure air to be sprayed in the same manner as above.

4 to 6 show a third embodiment of the device of the present invention.
In the example, a handy type sprayer is shown, in which one end of an aerosol transfer pipe 10 is connected to one end of a horizontally long cylindrical spray main body 9, and the other end of the spray main body 9 is closed. A small-diameter opening 11 is provided on the upper surface, and one end of a high-pressure air pipe 12 along the outer periphery of the upper part of the spray main body 9 is connected to a spray pipe 13 provided beside the small-diameter opening 11 to form the small-diameter opening. An appropriate number of jet outlets 14 are provided on the outer periphery of the spray pipe 13 facing the portion 11, and a handle 15 is further projected from the lower portion of the spray main body 9.

In the case of the third embodiment as well, the solution of the antistatic agent is made into an aerosol by a separately provided aerosol generator, and this is transferred by the aerosol transfer pipe 10, and the aerosol is introduced into the spray main body 9 to have the above-mentioned small diameter. Constant pressure from the opening 11,
For example, it is sprayed at ² Kg / cm ² . Then, through the high-pressure air pipe 12, high-pressure air from the ejection port 14 of the ejection pipe 13,
4 to 10 Kg / cm ² is ejected. As a result, the aerosol can be entrained in the high-pressure air to be sprayed, as in the above-mentioned embodiment. Therefore, the operator directs the small-diameter opening 11 and the ejection port 14 toward the surface of the object to be treated with the handle 15 and sprays the aerosol together with the high-pressure air.

7 to 11 show an application example using the apparatus and method of the present invention. The first application example of FIG. 7 is one side of a plastics film 21 extruded from a plastic sfil extrusion machine 20. The aerosol spraying device 22 of the present invention is provided in and the aerosol spraying device 22 sprays an aerosol composed of an antistatic agent together with high pressure air. This is of course plastic film 21
The aerosol spraying device 22 may be provided on the other side for spraying. In addition, near these aerosol spraying devices 22,
A suction device 23 for sucking dust and dust blown off by the high pressure air may be provided.

The second application example of FIG. 8 is used when a product such as plastic is molded by a pressing mold.
In order to remove the peeling charge when the mold and the female mold 25 are separated from each other, the molded product 26 is removed from between the male mold 24 and the female mold 25 at the time of mold release.
A high-pressure air and an aerosol of an antistatic agent or pure water are sprayed from an aerosol spraying device (not shown) of the present invention. As a result, the aerosol adheres to the surface of the molded product 26 and is instantly discharged.

In the third application example shown in FIG. 9, from the gate type spraying device 28 provided on the conveyor belt 27 toward the molded product, the packaged product 29, etc. on the conveyor belt 27, together with the high pressure air, an antistatic agent or a pure antistatic agent is used. This is for spraying an aerosol of water to eliminate the charge on the molded product, packaged product 29, etc. In this case, an appropriate suction device (not shown) may be provided beside the spray device 28 to suck and remove fine particles such as dust that has been discharged.

A fourth application example shown in FIG. 10 is a hollow box type spraying device 30 in which a person to be treated or work clothes is put, and high pressure air is supplied from a large number of openings provided in the hollow inner wall. At the same time, an antistatic agent or an aerosol of pure water is sprayed to remove the electric charge.

The fifth application example shown in FIG. 11 is of the present invention when a high-pressure gas blown from one side to the other side of an object to be processed such as a small-sized molded product, granules and powder is transferred. It is the one that uses the method. That is, the objects to be treated such as granules, powders, and small molded products are put into the transfer pipe 32 from the hopper 31, and high-pressure air is blown into the transfer pipe 32 with a blower 33 or the like to transfer the objects to be treated by the high-pressure air. In doing so, the water or the coating liquid is aerosolized by the aerosol generator 34, and this is sprayed into the transfer pipe 32. Then, the aerosol blown into the transfer pipe 32 is entrained in the high-pressure air and adheres to the object to be treated, and at the same time, dust and dust on the surface of the object to be treated are blown off by the high-pressure air,
The surface of the object to be processed is cleaned to clean the surface of the object to be processed such as the above-mentioned small-sized molded product, granules, powder, or to remove charge, or an appropriate coating liquid is applied to the surface of the object to be processed. Then, a cyclone (separator) 35 is provided at one end of the transfer pipe 32 to separate dust and dust from the object to be processed.

In the above embodiment, the atomizing pressure of the aerosol is set to 2 Kg / cm ² and the jet pressure of the high pressure air is set to 4 to 1
Although the pressure is set to 0 kg / cm ² , these pressures are not limited to these, and the ejection pressure of high-pressure air may be higher than the atomization pressure of the aerosol. If the high-pressure air is an inert gas, it will be ejected from a cylinder, so 20-30
It may be Kg.

In the above embodiment, high pressure air is used, but not limited to this, any suitable high pressure gas such as an inert gas may be used.
Further, the above embodiment shows the case of using the present invention for static elimination,
Although the aerosol is composed of a solution of an antistatic agent or pure water, when the present invention is used in a coating method, a surface modifier such as an antistatic agent, a rust preventive, an antifogging agent, or other appropriate coating liquid is used. Includes

[0030]

According to the first aspect of the present invention, when the high-pressure gas blows out from the vicinity of the spraying port of the aerosol, the high-pressure gas hits the surface of the object to be treated while entraining the aerosol. Turbulent flow to blow away the air layer on the surface of the object to be treated, and the suction force of the turbulent flow allows the aerosol to be easily attached to the surface of the object to be treated. Therefore, even if the aerosol is fine particles, it reliably adheres to the object to be processed at high speed.

Further, in the attached aerosol, a solvent such as water contained in the aerosol is instantly vaporized by the high-pressure gas jetted onto the surface of the object to be treated, so that an extremely thin film is formed on the object to be treated very quickly and surely. Of course, at that time, dust and dust adhering to the surface of the object to be treated are also blown off, and the surface of the object to be treated is cleaned before the coating film is formed.

According to the second aspect of the present invention, similarly to the above, an aerosol composed of fine particles adheres to the surface of the object to be treated, and the high-pressure gas is blown to the location to instantly vaporize the solvent to form an antistatic agent film. Formed quickly.

According to the third aspect of the present invention, in a method of forming an aerosol of a solution of an antistatic agent or pure water, and spraying the solution on an object to be treated for static elimination or cleaning, even if the particle diameter of the aerosol is reduced, the aerosol is reduced. Is stable, and the aerosol adheres to the object to be treated quickly and reliably, and removes static electricity on the surface of the object to be treated. Moreover, the solvent is vaporized by blowing the high-pressure gas onto the area, and the surface of the object to be processed is cleaned.

Further, in the invention of claim 4, even when the aerosol particles are fine particles in the application of the appropriate solution or the static electricity removal, the particles can be stably sprayed on the surface of the object to be treated, and the aerosol can be swiftly and reliably. Is a device capable of adhering to the object to be processed and cleaning the surface of the object to be processed.

According to the invention of claim 5, a small molded product,
While transferring objects such as granules and powders, electrostatic removal, cleaning, or application of an appropriate coating liquid can be reliably performed on the surfaces of these objects, which is extremely labor-saving or speedy. Is.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of an apparatus used in the method of the first embodiment of the present invention.

FIG. 2 is a partial cross-sectional side view showing a usage state of the apparatus used in the method of the first embodiment of the present invention.

FIG. 3 is a partial cross-sectional side view showing a usage state of the apparatus used in the method of the second embodiment of the present invention.

FIG. 4 is a partial cross-sectional front view of an apparatus used in the method of the third embodiment of the present invention.

FIG. 5 is a side view of an apparatus used in the method of the third embodiment of the present invention.

FIG. 6 is a partial cross-sectional plan view of an apparatus used in the method of the third embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a first application example using the apparatus and method of the present invention.

FIG. 8 is an explanatory diagram showing a second application example using the apparatus and method of the present invention.

FIG. 9 is an explanatory diagram showing a third application example using the apparatus and method of the present invention.

FIG. 10 is an explanatory diagram showing a fourth application example using the apparatus and method of the present invention.

FIG. 11 is an explanatory diagram showing a fifth application example using the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transfer pipe 2 Atomizer 3 Small diameter opening 4 Jet outlet 5 Jet pipe 6 High pressure air pipe 7 Object to be treated 8 Atomizing body 9 Aerosol transfer pipe 10 Small diameter opening 11 High pressure air pipe 12 Jet pipe 13 Jet outlet

Claims (5)

[Claims] 1. In a coating method in which a coating liquid is made into an aerosol and is sprayed on an object to be processed, a gas having a pressure higher than the spraying pressure of the aerosol is blown from near the spraying port of the aerosol to spray the aerosol on the object to be processed. An aerosol spraying method, characterized by: 2. The aerosol spraying method according to claim 1, wherein the coating liquid comprises an antistatic agent solution. 3. In the static electricity removal method of spraying an antistatic agent solution or pure water as an aerosol onto an object to be processed, a gas having a pressure higher than the spraying pressure of the aerosol is blown out from the vicinity of the spraying port of the aerosol. An aerosol spraying method, characterized in that the above aerosol is sprayed onto an object. 4. A transfer pipe for transferring an aerosol such as water or a coating liquid at an appropriate pressure is provided, and a hollow aerosol sprayer is connected to one end of the transfer pipe, and the opening of the sprayer has a small diameter. A jetted pipe having a narrowed small-diameter opening and having a jet port for jetting a high-pressure gas having a pressure higher than the atomizing pressure of the aerosol is provided in the spray body, and the jet port is formed on the small-diameter opening of the spray body. An aerosol spraying device, characterized in that 5. Granules made from water or a coating liquid as an aerosol,
In a coating method or a cleaning method of spraying an object to be processed such as powder or a small molded product, at the same time as spraying an aerosol into the transfer tube of the object to be processed, a gas having a pressure higher than the spraying pressure of the aerosol is blown into the transfer tube. An aerosol spraying method, characterized in that the object to be processed is transferred and the aerosol is attached to the object to be processed.