JPH07204545A - Forming of film by thermally accelerated particle and its device - Google Patents

Abstract

PURPOSE:To provide a film forming method by heat acceleration capable of producing at a high speed a dense and uniform film consisting of a surface modifier such as an antistatic agent and a cloud preventing agent and a solute such as a colorant and an adhesive on the surface of an object to be treated such as synthetic resin products and to provide its device. CONSTITUTION:An aerosol containing a solvent is sprayed in an atmosphere in which a heat rays having a wavelength easy to absorb the solvent is radiated by providing a heat source such as a heater in a chamber 3, and a molecular motion of each particle of the aerosol received the heat is activated to vaporize the solvent from its surface, and each particle becomes gradually to a film of the solute low in solvent at an outer peripheral surface, and thermal motion is accelerated, and during a progress of these. each particle is allowed to collide with the surface of the object to be treated 11, and a film consisting of the solute in each particle is formed on the object to be treated 11 by evaporating the solvent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is mainly for surface modification of antistatic agents, antifogging agents, antifungal agents, surface hardening agents, slip agents, antislip agents, etc. on the outer peripheral surface of molded products such as synthetic resins. The present invention relates to a surface coating method by accelerating thermal motion and an apparatus therefor capable of obtaining a dense and uniform coating composed of a solute of a coating liquid such as an agent, a coloring agent and an adhesive at a high speed.

[0002]

2. Description of the Related Art A conventional method has been employed in which a coating solution such as an antistatic agent is converted into an aerosol and sprayed on the surface of the article to be treated to apply the coating solution. In that case, the object to be treated is placed in the chamber or placed on a belt conveyor into the chamber, and the aerosol is sprayed onto the surface of the object to be treated there.

[0003]

However, in the film coated by this conventional coating method, the solvent and the solvent are vaporized from the outer surface of the film during drying because the ratio of the solute and the solvent is the same on the surface and inside. , A dry layer is formed on the outer surface. Then, a large amount of the solvent is confined in the vicinity of the surface of the object to be treated inside the film, and a vent hole through which the solvent evaporates from the outer surface of the film remains. Therefore, a dense and uniform film cannot be obtained and they cannot be stacked.

The present invention has been made in view of these points, and a surface modifying agent such as an antistatic agent or an antifogging agent, a coloring agent, an adhesive agent, etc. is formed on the surface of an object to be treated such as a synthetic resin product. An object of the present invention is to provide a surface film forming method by thermal acceleration and a device therefor capable of obtaining a dense and uniform film composed of the solute at a high speed, and to solve the above problems.

[0005]

In order to solve the problems, therefore, the invention of claim 1 is to provide a heat source in the chamber so that the solvent such as far infrared rays is radiated with a heat ray having a wavelength that is easily absorbed by the solvent. The aerosol containing it is sprayed, and the molecular motion of each particle of the aerosol that receives the heat is activated to vaporize the solvent from the surface, and the outer surface of each particle gradually becomes a solute film with less solvent, and the thermal motion accelerates. As these progress, the particles are made to collide with the surface of the object to be treated, and the solvent is vaporized to form a film consisting of the solute in each particle on the surface of the object to be treated. The surface film method using accelerated particles was used.

Further, the invention of claim 2 is characterized in that a heat source is provided in the chamber, and an aerosol containing the solvent is sprayed into an atmosphere in which a heat ray having a wavelength easily absorbed by the solvent such as far infrared rays is radiated. The molecular motion of each particle of the aerosol that receives the heat is activated to vaporize the solvent from its surface, and the outer surface of each particle gradually becomes a solute film with less solvent, the thermal motion is accelerated, and these progress. In the process, the inside of the chamber is made into a supersaturated state of the aerosol, and the particles are made to collide with the surface of the object to be treated in a state where the solvent is not vaporized any more, and the solvent is vaporized to consist of the solute in these particles. A surface film method using thermally accelerated particles was used to form a film on the surface of the object to be treated.

According to a third aspect of the present invention, a conveyor belt or a plate-like object having a large number of through holes for placing the object to be processed is moved in the longitudinal direction so as to face the opening of the substantially bowl-shaped chamber. Provided freely, a nozzle for spraying an appropriate coating liquid into an aerosol and spraying it toward the opening is provided in the inner peripheral inner part of the chamber, and each particle of the aerosol sprayed in the chamber has active molecular motion. The outer peripheral surface gradually became a solute film with a small amount of solvent while the solvent was vaporized from the surface, and a heat source for accelerating thermal motion was provided in the chamber to provide a surface film device using thermally accelerated particles.

According to a fourth aspect of the present invention, a conveyor belt or a plate-like object having a large number of through holes for placing the object to be processed is moved in the longitudinal direction so as to face the opening of the substantially bowl-shaped chamber. A partition is provided at a substantially central portion in the chamber, and the partition forms an aerosol circulation path in the chamber, and a nozzle for spraying an appropriate coating liquid as an aerosol toward the opening is provided. It is provided in the inner part of one chamber divided by a partition wall, and each particle of aerosol sprayed in this chamber becomes a solute film with less solvent while the solvent moves from its surface and the solvent is vaporized. A heat source for accelerating thermal motion is provided in the chamber, and the chamber is circulated by the aerosol circulating in the circulation path so that the aerosol is supersaturated. It was Table film device according to fast particles.

[0009]

According to the first aspect of the present invention, each particle of the aerosol which receives the heat of the heat source in the chamber has an active molecular motion inside the particle, and the solvent is vaporized from the surface thereof. Then, the outer peripheral surface gradually becomes a film of a solute with a small amount of solvent and a part of which is melted, the thermal motion is accelerated, and as these progress, each particle collides with the surface of the object to be treated and breaks instantly, In the state where the solvent is vaporized and the content of the solvent is very small, solutes having more vigorous molecular movement are successively deposited on the surface of the object to be treated, and the solvent is immediately vaporized to form a dense film.

According to the second aspect of the invention, each particle of the aerosol, which has received the heat of the heat source in the chamber, has an active molecular motion inside the particle, and the solvent is vaporized from the surface thereof.
Then, the outer peripheral surface gradually becomes a film of a solute in which the amount of the solvent is small and a part of which is dissolved, and the thermal motion is accelerated. Further, the inside of these chambers is in a supersaturated state of the aerosol, and the solvent of each particle is no longer vaporized. As these particles progress, each particle collides with the surface of the object to be processed and breaks instantly, the solvent evaporates and the content of the solvent becomes very small. The solvent adheres to the surface one after another and the solvent immediately evaporates to form a dense film.

According to the third aspect of the present invention, when the aerosol of the appropriate solution is sprayed from the nozzle in the chamber, the particles of these aerosols receive the heat of the heat source, the molecular motion becomes active, and the solvent moves from the surface. While the gas is being vaporized, the outer peripheral surface gradually becomes a film of a solute with a small amount of solvent, and a part of it is dissolved, the thermal motion is accelerated, and each particle is located in the opening of the chamber as these progress When the solvent is vaporized, the solvent content becomes very small, and solutes with more active molecular motion are successively attached to the surface of the object to be treated, and the solvent is immediately vaporized. It forms a dense film.

According to the invention of claim 4, when an aerosol of an appropriate solution is sprayed from the nozzle in the chamber, each particle of these aerosols receives heat from the heat source, the molecular motion becomes active, and the solvent moves from the surface. While the gas is being vaporized, the outer peripheral surface gradually becomes a film of solute with a small amount of solvent and a part of it is dissolved, and the thermal motion is accelerated. Further, the chamber is provided with a partition wall, and the aerosol sprayed from the inner part of one of the chambers partitioned by the partition wall circulates through the circulation path, and the inside of the chamber is in a supersaturated state of the aerosol. Therefore, the solvent of each particle cannot be vaporized any more. As these particles proceed, each particle moves to a position facing the opening of the chamber and collides with the surface of the object to be treated and is instantly broken, so that the solvent is vaporized and the solvent content is extremely high. The solutes, which are much smaller and have more vigorous molecular motion, adhere to the surface of the object to be treated one after another, and the solvent immediately evaporates to form a dense film.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. First, the apparatus of the present invention will be described. A box-shaped main body 1 is provided with a through-passage 2 penetrating substantially horizontally, and each opening is opposed to the through-passage 2 in the box-shaped main body 1 to form a substantially semicylindrical chamber. Two upper and lower chambers 3 are provided, and two upper and lower suction portions 4 facing the through passage 2 are provided in front of each of the upper and lower chambers 3, and the suction portion 4 and the chamber 3 are provided above the through passage 2. The heater part 5 is provided between the and. Further, two heater units 6 and two suction units 7 facing the through passage 2 are provided at the rear of each of the upper and lower chambers 3.

The suction sections 4 and 7 each have a suction groove having a length substantially the same as the width of the chamber 3.
It is provided above and below both ends of the through passage 2 so that the aerosol sprayed therein is not discharged from the box-shaped body 1. Further, the heater portion 5 warms the object to be treated that has entered the through passage 2 and suppresses the liquefaction of the aerosol floating at the location. Further, the heater section 6 promotes vaporization of the solvent of the object to be treated to which the aerosol is attached.

The inner peripheral wall of each chamber 3 is made of stainless steel and reflects light. Furthermore, each of these chambers 3
In the central portion of the
A heater 9 is provided at one end of each of the partition walls 8 and near the center of the opening of each chamber 3. Moreover, each of these partition walls 8
A nozzle 10 is provided on one side of each of the chambers 3 divided by, facing the opening of each chamber 3.

The through passage 2 is provided with a belt conveyor 12 on which an object 11 to be processed is placed and which moves in the through passage 2. The belt conveyer 12 is provided with horizontal bars between the belts on both sides in a grid-like manner.

Next, the method of the present invention will be described using the above apparatus. When a solution of an antistatic agent is prepared and ejected from each nozzle 10 together with air, it becomes an aerosol and each opening in each chamber 3 is opened. Is sprayed towards the section. Then, it passes through the space between the belt conveyors 12 and enters the side of the other chamber 3 which is partitioned by the partition wall 8 and has no nozzle 10. Further, by bypassing the inner end of the partition wall 8, the nozzle 1
Enter the 0 side. At that time, the pressure in the vicinity of the nozzle 10 is reduced, and the aerosol is sucked and mixed with the aerosol sprayed from the nozzle 10. In this way, the aerosol circulates and the inside of each chamber 3 becomes supersaturated.

When the object 11 to be processed is placed on the belt conveyor 12 outside one side of the box-shaped main body 1, the object 11 to be processed moves in the through passage 2 of the box-shaped main body 1. Then, the aerosol sprayed from the upper and lower nozzles 10 adheres to the surface of the processing object 11. The heat of the upper and lower heaters 6 at the rear of the box-shaped body 1 vaporizes the solvent of the aerosol adhering to the surface of the object to be treated 11 to form a film made of solute.

Further, the inside of each chamber 3 is heated by the direct heat of the heater 9 and the reflected heat of the inner peripheral wall of the chamber 3, while the aerosol becomes supersaturated. In this state, as shown in FIG. 3, the particles 13 of the aerosol sprayed from the nozzles 10 have active molecular motion due to heat, the solvent on the outer periphery is vaporized, and the particles 13 become smaller. Then, the outer peripheral surface gradually becomes a solute film 14 in which a small amount of the solvent is melted, and the above-described molecular motion, solvent vaporization, and thermodynamic motion including the moving speed of particles are accelerated, and these progress. During the course, each particle collides with the surface of the object to be treated 11 and is instantly broken, the solvent is vaporized and the content thereof becomes very small, and the solute having more active molecular motion is the surface of the object to be treated 10. To one after another,
The solvent is immediately vaporized to form a dense film 15.

When the object to be treated is a plate-like object such as a sheet, film or plate, as shown in FIG. 4, the sheet 16 or the like is passed through the through passage 2 in the above embodiment, and aerosol is applied to both side surfaces of these. Spray to form a film. In this case, as shown in FIG. 4, the aerosol sprayed from the nozzles 10 of the upper and lower chambers 3 circulates around the partition wall 8. Further, the apparatus shown in FIG. 4 may be used vertically to move a sheet, film, or plate-like object vertically.

Using the above apparatus, 5
A film of an antistatic agent was formed on acrylic glass (120 × 120) having a thickness of mm. The width of the belt conveyor 12 is 400 mm, two nozzles 10 are provided on the upper and lower sides, and 6 to 30 ml / min of an aqueous solution of 6% nonionic surfactant is supplied from each nozzle 10 to 40 / min. 60 liters, with a pressure of 2.5 to 4.0 kg / cm ² are poured out together with air to form an aerosol and sprayed, and 450 W / 20 is applied to each heater of the heater 9 and the heater parts 5 and 6.
Using a 0V far-infrared heater, each suction part 4 for sucking extra aerosol that is going to go out of the box-shaped body 1,
7 turbo blower 120w / 200V was used, and the line speed of the belt conveyor 12 was set to 3 to 10 m / min. As a result, the surface electrical properties of the object 11 to be treated had a surface resistance of 10 ¹⁶ Ω or more before the treatment, but became 5.0 × 10 ⁹ Ω to 3.0 × 10 ¹⁰ Ω after the treatment.
Surface dirt and scratches have also disappeared over the years.

To accelerate the thermal motion of the aerosol particles, a surface temperature of the particles of about 20 ° C to 100 ° C (generally 60 ° C is sufficient with a heat source such as a heater. Is suitable for generating a large amount of far infrared rays). Further, the size of the sprayed aerosol particles is preferably 40 μ or less, but by increasing the distance between the nozzle and the object to be treated, 100 μ to
It is possible to use 300μ. If the capacity of the heat source is further increased, the film stacking can be increased to form a film having a large film thickness of about 5 μm to 30 μm. Further, by making the surface tension of the particles smaller than the surface tension of the object to be treated, the speed of the surface film becomes faster and the film itself becomes stable.

In the above embodiment, the aerosol is circulated to create a supersaturated state of the solvent, but this is not an essential requirement of the present invention. Further, in the above example, the thermal motion of the aerosol particles was accelerated by the far-infrared heater, but the invention is not limited to this, and a heater or another appropriate heat source radiating a heat ray having a wavelength that is easily absorbed by the solvent (at room temperature) But sometimes the heat rays radiate). Further, the belt conveyor is not limited to the one in the above embodiment, and may be any one having a large number of appropriate through holes. The apparatus used in the above method is not limited to that of the above embodiment.
Furthermore, although the antistatic agent was used in the above examples, the present invention is not limited to this, and an antifogging agent, an antifungal agent, a surface hardening agent, a slip agent, a surface modifier such as an antislip agent, a coloring agent, an adhesive agent, etc. A film made of the coating liquid can be formed on the surface of the object to be treated.

[0024]

According to the first aspect of the present invention, the aerosol of the coating liquid for forming a film is attached to the surface of the object to be treated in a state where the content of the solvent is very small and the molecular motion is active. Therefore, the solvent evaporates quickly, and a dense and uniform film made of solute can be formed on the surface of the object to be processed at high speed. Further, it is easy to stack these films if necessary, and in that case also, a dense and uniform film can be formed without generating vent holes due to evaporation of the solvent.

In addition to the above effects, the invention of claim 2 further promotes vaporization of the solvent, and a denser and more uniform film can be obtained at a higher speed. Further, according to the inventions of claims 3 and 4, when the above method is carried out by using these devices, a film similar to those of claims 1 and 2 can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic side view of a device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration front view of an apparatus according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing changes from the time of spraying aerosol particles of the present invention to the time when the particles are attached to the object to be treated.

FIG. 4 is a side view showing a schematic configuration of an apparatus according to another embodiment of the present invention.

[Explanation of symbols]

1 Box-shaped main body 2 Through passage 3 Chamber 4 Suction part 6 Heater part 7 Suction part 9 Heater 10 Nozzle 11 Object to be treated 12 Belt conveyor 13 Particles

Claims (4)

[Claims] 1. A molecular motion of each particle of the aerosol which is obtained by spraying an aerosol containing the solvent in an atmosphere in which a heat source having a wavelength that is easily absorbed by the solvent is radiated in a chamber provided with a heat source. To evaporate the solvent from the surface of each particle, the outer peripheral surface of each particle gradually becomes a solute film with less solvent, the thermal motion is accelerated, and while these particles progress, the particles are treated. A surface coating method using thermally accelerated particles, which comprises causing a solvent to vaporize on a surface to form a film made of a solute in each of these particles on the surface of an object to be processed. 2. A heat source is provided in the chamber to spray an aerosol containing the solvent into an atmosphere in which a heat ray having a wavelength easily absorbed by the solvent is emitted, and the molecular motion of each particle of the aerosol which receives the heat. To vaporize the solvent from its surface, the outer surface of each particle gradually becomes a solute film with less solvent, the thermal motion is accelerated, and as these progress, supersaturation of the aerosol in the chamber occurs. In this state, each particle is made to collide with the surface of the object to be processed, and the solvent is vaporized to form a film consisting of the solute in each of these particles on the surface of the object to be processed. Membrane method. 3. A conveyor belt or a plate-shaped object to be processed having a large number of through holes for mounting the object to be processed is provided movably in the longitudinal direction facing the opening of the substantially bowl-shaped chamber,
A nozzle for spraying an appropriate coating liquid into an aerosol and spraying it toward the opening is provided at the inner peripheral inner part of the chamber, and each particle of the aerosol sprayed in the chamber has a molecular motion that is active and from its surface. While the solvent is vaporized, the outer peripheral surface gradually becomes a solute film with less solvent, and a heat source for accelerating thermal motion is provided in the chamber,
Surface film device using thermally accelerated particles. 4. A conveyor belt or a plate-like object having a large number of through holes for placing an object to be processed is provided movably in the longitudinal direction so as to face the opening of a substantially bowl-shaped chamber,
A partition is provided in the substantially central part of the chamber, and the partition forms an aerosol circulation path in the chamber.
A nozzle for spraying an appropriate coating liquid into an aerosol toward the opening is provided in the inner part of one chamber divided by the partition wall, and each particle of the aerosol sprayed in the chamber has a vigorous molecular motion. While the solvent evaporates from the surface, the outer surface gradually becomes a solute film with less solvent, a heat source that accelerates thermal motion is provided in the chamber, and the aerosol circulating in the circulation path further causes the supersaturated state of the aerosol in the chamber. A surface film device using thermally accelerated particles, characterized in that