JP3250004B2 - Mixed color spray gun and mixed color coating method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed-color spray gun for spray-coating a liquid paint of two or more colors in an incompletely mixed state, and a coating method for obtaining a pattern coating film in such a mixed state.

[0002]

2. Description of the Related Art Conventionally, as this kind of technique, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 3-21362, for example. The spray gun contains another colored paint in a base paint container, and the two paints are brought into contact at the bottom of the base paint container, guided to a merging chamber, and ejected from a single spray nozzle, or Two or more cups are installed in parallel, contain colored paint, and lead these paints to the merging room.
Injection is performed from a single injection nozzle.

[0003]

As a method of forming a painted surface on a granite texture having irregularities, for example, by using the above-mentioned conventional mixed-color spray gun, for example, a base paint mixed with an aggregate such as silica sand and colored Guide the paint to the merging room,
Injection methods are known.

However, the color paint and the base paint have a high viscosity and the use ratio of the color paint is small.
With the above conventional gun, it is extremely difficult to disperse the colored paint uniformly and scatteredly in a small amount in the base paint, and it is insufficient for a multicolor texture finish having irregularities.

[0005] A similar problem is also encountered in a method of forming the above-mentioned texture (natural stone-like texture with irregularities) without mixing an aggregate with a base paint.

According to the present invention, even when a high-viscosity colored paint is used,
It is an object of the present invention to provide a mixed-color spray gun and a coating method capable of forming a coated surface having a texture close to natural stone such as granite.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to provide a color mixing spray gun for spraying a base paint as a base material and a coloring paint added to the base material in a non-mixed state by spraying. A base paint container, a colored paint container, and a merging chamber into which each of these paints is introduced. The merging chamber is an injection nozzle having one end tapered and having an injection port at the tip. An air pipe connected to a compressed air supply source extends into the merging chamber and has an air discharge port near the injection nozzle, and the colored paint container is pressurized to pump paint in the container. This is achieved by a multi-color spray gun characterized in that it comprises means and has a replaceable orifice valve interposed in the connecting passage with the merging chamber.

In particular, in the present invention, since the colored paint container is provided with a pressurizing means, the desired amount can be uniformly dispersed in the base paint even if the viscosity is high.

It is preferable that the connecting position of the colored paint container to the merging chamber is closer to the injection nozzle than the connecting position of the base paint container to the merging chamber.

[0010] Another object of the present invention is to provide a coating method in which a base paint and a colored paint are sprayed in an unmixed state by spraying, wherein the viscosity is 5 to 30 Pa · s and the weight ratio to the base paint 100 is 100%. However, the present invention is also achieved by a coating method in which 0.5 to 10 colored paints are sprayed in contact with a base paint immediately before spraying.

In the present specification, the term "mixed color" means a state in which large and small particles have a single color or different colors, such as granite. Also, the term "tube"
It means a squeezing container for pastes.

[0012]

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

1 to 3 show a first embodiment of a color mixing spray gun according to the present invention. Mixed color spray gun 1
Has a base paint container 2, a colored paint container 3, and a merging chamber 4 into which these paints are introduced. The merging chamber 4 has an injection nozzle 5 whose one end can be adjusted and has an air discharge port 6 inside.

The colored paint container 3 is connected to the merging chamber 4 by a connecting pipe 7. The colored paint container 3 can be arranged outside the base paint container 2 and closer to the spray nozzle 5, and its connecting pipe 7 is located at a position higher than the position where the base paint container 2 is connected to the merging chamber 4. It is preferable to be provided near the tip of the air discharge port 6. Colored paint container 3
By disposing the position of the connecting pipe 7 above the end of the air discharge port 6 rather than the connecting position of the base paint container 2, the contact time between the colored paint and the base paint is shortened, and the influence of turbulence in the merging chamber is reduced. Therefore, the two paints are hardly mixed, the colored paint can be maintained in a granular form, and a clear pattern can be formed.

The position of the connecting pipe 7 to the base paint merging chamber 4 can be arbitrarily selected according to the purpose. In a general hand-held spray coating machine for building exterior, for example, the spray nozzle 5
When the outlet of the air discharge port 6 is 5 to 20 mm from the outlet of the spray nozzle 5, the introduction position of the coloring paint is 35 to 30 mm from the outlet at the tip of the spray nozzle 5. It is preferably provided at a position of 45 mm.

In this embodiment, two colored paint containers 3 are provided, but of course, one or three or more colored paint containers can be provided.

The colored paint container 3 is provided with a lid 3a capable of sealing the inside of the container, and functions as a pressurized container. The lid 3a can be of a screw fitting type. In the lid 3a,
A conduit 8a for guiding compressed air is connected, and functions as a pressurizing unit that compresses the inside of the colored paint container 3. This conduit 8a
Is connected to an on-off valve device (valve) 9. The on-off valve device 9 includes an air pipe 8b extending to the air discharge port 6,
A pipe 8 connected to an air reservoir (not shown) is connected, and an operation lever 9a for opening and closing the valve is provided.

The connecting pipe 7 is located near the connecting position of the merging chamber 4,
A replaceable orifice valve 10 is provided. Orifice valve 10
Can be a screw-in type. For example, as shown in FIG. 3, a screw notch that can be screwed into the connecting pipe mounting portion 4 a protruding from the merging chamber 4 is formed on the outer peripheral surface thereof.
An orifice passage 10a passing through the axis is formed, and a recess 10b for a hexagon wrench is formed at one end of the orifice passage 10a, so that the connecting pipe mounting portion 4a is formed.
Can be screwed into. The diameter of the orifice passage 10a is preferably 1 mm to 3 mm,
It is preferable to prepare various orifice valves 10 having different diameters within this range so that they can be replaced according to the purpose.

As described above, if the orifice valve 10 is replaced, a pattern with higher reproducibility can be formed as compared with the screw adjustment type. That is, if the flow rate is adjusted using a screw type adjustment valve, fine adjustment is difficult, and this is particularly remarkable when the flow rate is very small. The connecting pipe 7 may be provided with an opening / closing cock 11 near the colored paint container 3.

The operation of the color mixing spray gun 1 of the first embodiment having the above configuration will be described below.

For example, when it is desired to create a painted surface that resembles a white shadow, a white paint is used as the base paint. Examples of the material of the paint include an aqueous paint using an organic or inorganic synthetic resin such as a silicate resin such as a vinyl resin or an acrylic resin. The viscosity of this base paint is 5-30P
It is preferable to use a · s (JIS, K-5400-4-5-3 test method measurement value). The aggregate may be mixed with the base paint. Examples of the coloring paint include a water-based paint using the material described in the base paint (preferably not containing an aggregate). The color tone can be arbitrarily selected depending on the balance with the base paint, and there is no limitation. For example, an ocher or black paint is used for a white base paint. The viscosity of the colored paint may be the same as or different from the base paint.

The orifice valve 10 is selected and attached so that the weight ratio between the base paint and the colored paint is, for example, 100: 0.5 to 10 in the merging chamber.

The pressure of the compressed air is, for example, 0.2 to 2.
It can be 0 kgf / cm ² . Air pipe 8b
When the high-pressure compressed air is ejected from the air discharge port 6 through the, the base paint in the merging chamber 4 is ejected from the ejection nozzle. When the paint in the merging chamber 4 is jetted, a negative pressure is generated in the merging chamber 4, and the base paint and the coloring paint are drawn into the merging chamber 4 and are successively jetted. Is difficult to uniformly and uniformly flow out.

When the colored paint passes through the orifice,
The flow rate is adjusted so as to be a small amount indicated by the volume ratio. Further, since the coloring paint has a high viscosity as described above, it is not introduced much by only the negative pressure in the merging chamber 4. Therefore,
By pressurizing the inside of the colored paint container 3, the colored paint is forcibly introduced into the merging chamber 4.

Since the color paint is introduced into the base paint immediately before being sprayed from the spray nozzle 5, the color of the base paint and the color of the color paint are mixed little and almost unmixed. It is injected as it is. The paint to be sprayed becomes fine particles, and because the fine particles themselves have a high viscosity, they do not become flat when they adhere to the painted surface, they form an uneven texture, and in this case, paint like natural white granite Surface.

FIG. 4 shows a second embodiment of the color mixing spray gun according to the present invention. Since the base paint container and the merging chamber are the same as those in the first embodiment, illustration and description are omitted, and characteristic portions will be mainly described. First
Portions denoted by the same reference numerals as those of the embodiment indicate the same components as those of the first embodiment.

As described above, the coloring paint has a high viscosity, so that it is not easy to fill the coloring paint container. Therefore, the flexible tube 20 pre-filled with the coloring paint is
It is stored in the colored paint container 3. Such a tube 20
Comprises a screw-in cap 21,
Is provided with a discharge port 22 formed with a male screw for screwing. At the inner bottom of the colored paint container 3, the discharge port 22 is provided.
Mounting portion 24 formed with female screw 23 meshing with male screw of
Is provided. Therefore, the cap 2 of the tube 20
When 1 is a snap fit, a mounting portion having a structure corresponding to the snap fit is provided. The tube 20 can be attached to the bottom of the container 3 by other known means.

As described above, if a flexible tube is used in which the colored paint contained in the pressurized container 3 can be exchanged, the work of supplying the paint becomes easy and the work efficiency is improved.

FIG. 5 shows a third embodiment of the color mixing spray gun according to the present invention. Illustration and description of components similar to those of the first embodiment are omitted, and characteristic portions will be mainly described.

This embodiment differs from the first embodiment in that the colored paint container 3 is a cassette type pressurized cylinder 30 in which colored paint is sealed. The connecting pipe 7 and the pressurizing cylinder 30 are provided with valve devices 31 and 32 at the ends where they are connected to each other, as shown in FIGS. 6 and 7, for example. The valve devices 31 and 32 are provided with springs 31a and 32a. Valve bodies 31b and 32b for closing the passage of the paint. Valve body 3
1, 32 are support rods 3 penetrating the support plates 31c, 32c.
1d, 32d, the support plates 31c, 32
In c, through holes 31e and 32e forming a flow path are formed.

When the communication pipe 7 and the pressurizing cylinder 30 are joined, the valve bodies 31b and 32b of the two valve devices 31 and 32 press each other to open the valve, thereby communicating the paint passage. I have.

The connection between the connecting pipe 7 and the pressurizing cylinder 30 is made by connecting a threaded flange 7a formed at the connection end of the connecting pipe 7 to a screw formed on the outer peripheral surface of the end of the valve device 31 of the pressurizing cylinder 30. And by screwing.

When the connection pipe 7 and the pressure cylinder 30 are disconnected, as shown in FIG. 7, the valve element 31b and the valve element 32b
Each of the springs 31a and 31b presses the valve seat 31.
f, 32f to close the flow path.

As described above, if the colored paint container 3 is a replaceable pressurized cylinder type, the work of filling the paint becomes easy and the workability is improved.

[0035]

As described above, the air type spray nozzle according to the present invention can form a texture having irregularities on the coated surface with good reproducibility by using a high-viscosity colored paint. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a color mixing spray gun according to the present invention.

FIG. 2 is a vertical sectional side view of the color mixing spray gun of FIG. 1;

FIG. 3 is an enlarged partial cross-sectional view showing a part of FIG. 1;

FIG. 4 is a side view showing a main part of a second embodiment of a color mixing spray gun according to the present invention in a partial cross section.

FIG. 5 is a side view schematically showing a main part of a third embodiment of a color mixing spray gun according to the present invention.

FIG. 6 is a cross-sectional view showing a connection state between a pressure cylinder and a connecting pipe, which are components of the color mixing spray gun of FIG. 5;

7 is a cross-sectional view showing a state where the connection state of FIG. 6 is released.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mixed-color spray gun 2 base paint container 3 colored paint container 4 merging chamber 5 injection nozzle 6 air discharge port 9 valve 10 orifice valve 3a lid 20 tube 22 mouth 24 mounting portion 31 connection portion 30 pressurized cylinder

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-21362 (JP, A) Jikken 48-9664 (JP, Y1) Jikgyo 6-32817 (JP, Y2) (58) Field (Int.Cl. ⁷ , DB name) B05B ⁷ /02-7/12 B05B 7/24 B05D 1 / 02,3 / 00 B05D 5/06 101

Claims (6)

(57) [Claims] 1. A color spray gun for spraying a base paint as a base material and a color paint added to the base material in a non-mixed state by spraying the base paint and a base paint container. And a merging chamber into which each of these paints is introduced. The merging chamber is an injection nozzle having one end tapered and having an injection port at a tip, and is connected to a compressed air supply source. An air pipe extends into the merging chamber and is provided with an air discharge port near the spray nozzle. The colored paint container has a pressurizing means for feeding the paint in the container and is connected to the merging chamber. A color mixing spray gun characterized in that a replaceable orifice valve is interposed in the passage. 2. The connecting position of the colored paint container to the merging chamber is closer to the injection nozzle than the connecting position of the base paint container to the merging room. The mixed color spray gun according to 1. 3. The spray gun according to claim 1, wherein the colored paint container has a sealable lid, and a conduit for guiding compressed air is connected to the container. 4. A colored paint contained in the colored paint container is filled in a flexible tube, and the tube can be contained in the container, and a bottom portion of the colored paint container is provided. The color mixing spray gun according to claim 3, wherein a connection portion for connecting an opening of the tube to a connection path to the merging chamber is formed. 5. The mixed color spray gun according to claim 1, wherein the colored paint container is a cassette type pressurized cylinder filled with a colored paint. 6. A coating method in which a base paint and a color paint are sprayed in an unmixed state by spraying, wherein the viscosity of the color paint is 5 to 30 Pa · s, and the weight ratio to the base paint 100 is 0.5. 10. A coating method, characterized in that the coloring paint of any one of (1) to (10) is brought into contact with a base paint immediately before the spraying and sprayed.