JPH10272416A - Coating method of panel made of cellular concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perfectly bury micropores present in a surface layer of a panel and the whole slanting surface of a groove-shaped decorated joint by using plural pieces of spray guns arranged slantly so that the direction spraying a paint is converged to a specific position. SOLUTION: An air blow-off direction of one air nozzle 2a is faced to the traveling direction A side of an ALC panel 1 and an air blow-off direction of another air nozzle 2b is faced to the direction opposite to the traveling direction A of the ACL panel 1. A primary-coating paint applied on a surface of the ALC panel 1 is nearly uniformly applied on the whole surface of the ALC panel 1 with the air blown off from the air nozzles 2a, 2b and is perfectly penetrated into micropores. As the result, all micropores containing the micropores present in respective slanting surfaces 5a, 5b, 6a, 6b of the groove- shaped decorative joint 7 formed on the surface of the ACL panel 1 are perfectly filled with the primary-coating paint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam concrete panel, particularly a foam concrete panel having a groove-shaped joint having a substantially V-shaped cross section formed on the surface layer side. It relates to a method of painting on a surface.

[0002]

BACKGROUND OF THE INVENTION Steam-cured lightweight cellular concrete
As a coating method for filling a micropore present in the surface layer with a coating by coating a panel made of A undercoat 3C, an electrostatic coating method has been conventionally known (Japanese Patent Application Laid-Open No. Hei 4-300267). ). Although this electrostatic coating method is quite effective as a method of eliminating micropores that are open on the surface of the panel, in practice, a considerable amount of paint must be used to completely eliminate micropores That included the problem.

Accordingly, the present applicant has applied the method of forming a coating film using a spray gun and an air nozzle, which is applied to coating a general panel having joint grooves, to the surface coating of an A undercoat 3C panel having micropores. I tried,
By using a specific spray gun and air nozzle, it has been found that the micropores can be filled even by using a relatively small amount of paint, and this method has been previously proposed (JP-A-7-195).
027 publication).

However, as a result of continuing further detailed studies, the above-mentioned method proposed by the present applicant has shown that, in particular, a bubble having a groove-shaped cosmetic joint having a substantially V-shaped cross section formed on the surface thereof. When painting a concrete panel, there is a tendency for the paint to cling to one slope of the joint groove due to the fact that the air is blown out from the air nozzle in only one direction. It has been found that the problem is that some of the micropores existing in the micropores are not sufficiently filled.

[0005]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying to solve the problems in the prior art described above. Therefore, the object of the present invention is to
When painting a panel made of aerated concrete with joint grooves, such as an A undercoat paint 3C panel having a grooved decorative joint having a substantially V-shaped cross section on the surface, a relatively small amount of paint is used, and It is an object of the present invention to provide a coating method capable of completely filling the micropores present on the surface layer of the panel and all the slopes of the groove-shaped decorative joint by single coating.

[0006]

In order to achieve the above object, a method for coating a cellular concrete panel according to the present invention is characterized in that a groove-shaped decorative joint having a substantially V-shaped cross section is formed at least on the surface layer side. After spraying the paint with a spray gun on the surface of the cellular concrete panel that is being made, in a coating method in which air is sprayed on the paint from an air nozzle having a slit-shaped outlet before the paint is cured, the spray gun is used as the spray gun. A plurality of spray guns installed at a predetermined distance from each other and inclined so that the direction of spraying the paint converges to a predetermined position are used, and the air nozzle has a nozzle length of the cellular concrete panel. Longer than the width, at least one air blowing direction is oriented in the traveling direction of the cellular concrete panel, and at least Air blowing direction of the book, characterized by using a plurality of air nozzles facing opposite directions in the traveling direction of the bubble concrete panels.

In the method for coating a cellular concrete panel according to the present invention, the air blowing direction of at least one air nozzle is such that the angle of attack with the panel surface in the traveling direction of the cellular concrete panel is 90 degrees to 120 degrees. And at least one other air blowing direction is installed at a predetermined distance so that the angle of attack with the panel surface in the traveling direction of the cellular concrete panel is 60 degrees to 90 degrees. The longitudinal direction of the air outlet and the traveling direction of the cellular concrete panel are
It is inclined at an angle of 15 degrees to 75 degrees, and the air nozzle is disposed so as to discharge air over the entire width of the cellular concrete panel, the surface of the cellular concrete panel, the air outlet of the air nozzle, Is 5
３０30 mm, the air blowing air pressure of the air nozzle is 30 m / s or more, and the distance between the surface of the cellular concrete panel and the tip of the spray gun is 10５5.
0 cm, and the spray pressure of the spray gun is 3 kg.
f / cm ² or more is a desirable condition, and when these conditions are applied, an even better effect is exhibited.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. 1 is a perspective view of an apparatus used in one embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIGS. 3 and 4 are views showing an air blowing direction, and FIGS. Explanatory sectional view of a main part showing an air blowing step, FIGS.
FIG. 2 is a partially broken enlarged cross-sectional view of the A undercoat paint 3C panel after passing through a paint spraying step and after passing through an air spraying step, respectively.

As shown in FIGS. 1 and 2, when the coating method of the present invention is carried out, an undercoat paint 3C having a groove-shaped decorative joint having a substantially V-shaped cross section on its surface is provided.
The panel 1 is supplied by the roller conveyor 15 in the direction of the arrow A in the order of the paint spraying step X and the air spraying step Y at a predetermined speed. The dust on the surface has been removed by another air blowing means (not shown) in advance. here,
The term “substantially V-shaped” means that the bottom of the V-shape is formed flat, the one that is concavely curved like a substantially U-shape, the one that is wavy, and the like. The A undercoat 3C panel 1 is manufactured by a well-known method itself, and is provided with a groove-shaped decorative joint 7 having a substantially V-shaped cross section on at least the surface layer side in a lattice shape. I have.

The paint spraying step X includes a compressed air supply means 12, two spray guns 4 connected to the compressed air supply means 12 via a supply pipe 13, and a supply pipe 14 connected to the spray guns 4. And a paint supply means (not shown) connected via a. The two spray guns 4 are installed at a predetermined distance from each other,
And the spray direction is inclined so as to converge to the predetermined position P.

Here, "converge" means not only the case where the light beam is surely converged at the predetermined position P, but also that of FIG.
When the paint spraying direction C is viewed from the side common to the two spray guns 4 indicated by the arrow D, the paint spraying direction also converges to the point P. Further, when the directions C, C in which the paint is sprayed from the spray gun 4 are viewed from above, the two directions may be parallel.

In the paint spraying step X, the two spray guns 4 are installed at a predetermined distance from each other, and the spray guns 4 are installed so as to be inclined so that their spraying directions converge to the predetermined position P. The paint sprayed from these spray guns 4 includes not only the micropores 16 opened in the surface layer of the A undercoat paint 3C panel 1 but also the respective inclined surfaces of the grooved joint 7 as shown in FIGS. 5a, 5b, 6a,
The micropores 16 opened in the holes 6b are also reliably filled. Further, even in the case of a relatively small micropore 16 whose cross section increases from the surface toward the inside, it is possible to completely push the paint into the inside of the micropore 16.

Next, the air spraying step Y includes the supporting means 9 installed so as to straddle the A undercoat 3C panel 1.
A horizontal arm 10 extending horizontally from the lower end of the support means 9; holders 11a and 11b attached downward to the tip of the horizontal arm 10;
It comprises two air nozzles 2a and 2b rotatably supported by 1a and 11b. Air nozzles 2a, 2
Reference numeral b denotes a relatively long air discharge means having a slit-shaped air discharge port at its lower end and having an air supply pipe 8 at one end communicating with an air compression means (not shown).

In this embodiment, as shown in FIG. 3, the air nozzles 2a and 2b are mounted at an equal inclination angle L and inclined 45 degrees with respect to the traveling direction A of the ALC panel 1. In addition, as shown in FIG.
The air discharge angle M of the ALC panel 1 is set such that the angle of attack with the panel surface in the traveling direction A of the ALC panel 1 is 85 degrees, and the air discharge angle N of the other air nozzle 2b is
The angle of attack with the panel surface in the traveling direction A is set to 110 degrees. That is, the air blowing direction of one air nozzle 2a is directed toward the traveling direction A of the ALC panel 1, and the air blowing direction of the other air nozzle 2b is
The panel 1 faces the direction opposite to the traveling direction A.

In the air blowing step Y, the air nozzles 2a and 2b that blow air before the paint is cured have an angle of 15 to 75 degrees between the longitudinal direction of the air outlet and the traveling direction A of the ALC panel 1. The ALC panel 1 is disposed so that air is discharged over the entire width of the ALC panel 1.
On the other hand, the air nozzle 2a that blows out air first has an angle of attack of 9 in the traveling direction A of the ALC panel 1 with respect to the panel surface.
Since it is installed so that it may become an angle of 0 to 120 degrees, and the blown air moves so as to hold down the paint, as shown in FIG. 4, the groove-shaped decorative joint 7 facing the blown air is formed. The paint can be pushed into the relatively large micropores 16 present on the inclined surfaces 5b, 6b, and the paint can be moved to the inclined surfaces 5a, 5b on the opposite side to the blown air so that the paint can be deposited evenly. .

An air nozzle 2a for continuously blowing air to the ALC panel 1 traveling in the direction of arrow A is
The C panel 1 is installed so that the angle of attack of the C panel 1 with respect to the panel surface in the traveling direction A is 60 to 90 degrees, and the blown air moves so as to sweep the paint.
As shown in the figure, not only can the paint be pushed into the relatively large micropores 16 present on the inclined surfaces 5a and 6b of the grooved joint 7 facing the blown air, but also on the side opposite to the blown air. The paint is moved to the inclined surfaces 5a, 6b of the above, and is evenly adhered, and is applied on the paint already pushed into the micropores 16 to completely fill the micropores 16 existing on the entire inclined surfaces. Can be.

Further, the air nozzle 2a is shown in FIGS.
As shown in (1), the undercoat paint 3 is swept to reduce the thickness, and the other air nozzle 2b acts to place the undercoat paint 3 on the surface of the ALC panel 1, and the paint film is formed. Thicken. Accordingly, both air nozzles 2a, 2
The thickness of the coating film can be controlled by adjusting the wind speed of the air coming out of b.

Next, an actual example of a method of coating the ALC panel 1 by the paint spraying step X and the air spraying step Y will be specifically described. In this example, the spray gun 4 having a discharge port diameter of 6 mm is inclined so that the distance between the lower end thereof and the surface (uppermost surface) of the ALC panel 1 is 30 cm, and the spray direction of the paint converges at a predetermined position. is set up. From these spray guns 4, 20 dPa. An undercoat having a viscosity of s is placed on compressed air at a pressure of 4 kgf / cm ² and applied so as to converge on the surface of the ALC panel 1.

While the ALC panel 1 is placed on the roller conveyor 15 and moves in the direction of the arrow A at a constant speed, 1.0 kg
The undercoat paint is discharged from the spray gun 4 of the reciprocator so as to have an adhesion amount of / m ² and adheres to the surface of the ALC panel 1 on average. That is, as shown in FIG. 11, micropores 16 having different diameters are opened on the surface of the ALC panel 1.
6, the undercoat 3 is completely filled in the micropores 16, the undercoat 3 is filled only at the bottom of the micropores 16, and the undercoat 3 is the opening of the micropores 16. The surface of the ALC panel 1 is covered with the undercoat paint 3 in a form in which the hollow portion 17 is formed inside the micropore 16 so as to cover only the undercoat paint 3, and the spray gun 4 moves the paint spray direction at a predetermined position. Because it is installed at an angle to converge, ALC
The undercoat 3 is evenly applied to the surfaces of the inclined surfaces of the grooved decorative joint 7 formed on the surface of the panel 1 in a manner in which the above aspects are similarly mixed.

The ALC panel 1 that has passed through the paint spraying step X subsequently proceeds to an air spraying step Y. In the air spraying step Y, the lower ends of the air nozzles 2a and 2b and the surface (the uppermost surface) of the ALC panel 1 ) Is set to be 20 mm, the air blowing air pressure is set to 70 m / s, and the rear ends of the air nozzles 2a and 2b are located so close that the undercoat paint 3 is not cured from the paint spraying step X. The positional relationship of each process is set so that the position comes. Here, the “position that does not cure” refers to the paint spraying process X in which the undercoat paint 3 applied in the paint spraying process X can maintain a fluid state even when it receives air from the air nozzles 2a and 2b.
Means a close position.

In this air spraying step, as shown in FIG. 12, the undercoat paint 3 applied to the surface of the ALC panel 1 is blown by the air blown from the air nozzles 2a and 2b, as shown in FIG. And is completely pushed into the micropores 16, and as a result, the micropores existing on the inclined surfaces 5 a, 5 b, 6 a, 6 b of the grooved decorative joint 7 formed on the surface of the ALC panel 1. Is filled completely with the undercoat paint 3.

That is, in one air nozzle 2b, the longitudinal direction of the air outlet is inclined with respect to the traveling direction A of the ALC panel 1, and the angle of attack with the panel surface in the traveling direction of the ALC panel 1 is 90 degrees or more. The air discharged from the spray gun 4 strongly presses the inclined surfaces 5b and 6b of the grooved joint 7 together with the flat portion of the ALC panel 1 surface. Slope surfaces 5b, 6 for which it was incomplete to push paint 3
The paint can be pushed into the relatively large micropores 16 existing in the area b, and the paint can be moved to the inclined surfaces 5a and 6a on the opposite side to the blown air, so that the paint can be attached evenly on the whole.

The other air nozzle 2a is installed on the ALC panel 1 so as to be inclined in a direction opposite to that of the air nozzle 2b. At the same time, the inclined surfaces 5a and 6a of the grooved joint 7 are strongly pressed,
The spray gun 4 can also push the paint into the relatively large micropores 16 present on the inclined surfaces 5a, 6a where the undercoating paint 3 was incompletely pushed, and the inclined surface 5b opposite to the blown air. , 6b so that they can be applied evenly overall.

Accordingly, all the inclined surfaces 5a, 5b, 6a, 6a,
At the same time that the coating material 3 is evenly applied to the coating 6b, the coating material 3 is completely filled in the micropore 16 by overlying the coating material already pressed into the micropore 16. As a result, according to the coating method of the present invention, the micropores present on the surface layer of the panel and all the slopes of the grooved joint are completely filled by a single coating with a relatively small amount of paint. Is very efficient and economical.

In the above, the distance (distance) between the lower end of the spray gun and the surface of the cellular concrete panel is 10 to 10.
It is 50 cm, preferably 20 to 40 cm. The discharge pressure of the paint from the spray gun is 3.0 kgf / cm.
^{It is 2} or more, preferably 4.0 kgf / cm ² or more.
The inclination angles of the air nozzles 2a and 2b can be changed in the range of 20 to 90 degrees, and particularly preferably in the range of 30 to 60 degrees. The air blowing angle of the air nozzle 2b is ALC
The angle of attack of the panel 1 with respect to the panel surface in the traveling direction A is 90 to 120 degrees, and particularly preferably in the range of 100 to 115 degrees. In addition, the air blowing angle of the air nozzle 2a is such that the angle of attack with the panel surface in the traveling direction A of the ALC panel is 60 to 90 degrees, and the range of the undercoat 30 to 35 degrees is particularly preferable. Further, the predetermined distance between the air nozzle and the surface of the ALC panel is 5 to 30 mm.
However, the slit width of the air discharge port of the air nozzle is preferably set in a range of 0.5 to 4.0 mm.

The present invention is not limited to the above embodiment, but can be implemented with some modifications. For example, in the above example, the ALC panel was moved on the roller conveyor at a constant speed, but the invention is not limited to this. The ALC panel may be fixed and the spray gun and the air nozzle may be moved. In the above description, the coating of the ALC panel having the grooved joints formed on the surface has been described. However, the coating method of the present invention is applied to the coating of a cellular concrete panel having a flat surface without the grooved joints. Needless to say, this is also applicable.

[0027]

As described above, according to the coating method of the present invention, a cellular concrete with joint grooves such as an ALC panel in which a groove-like decorative joint having a substantially V-shaped cross section is formed on the surface. It is possible to completely fill the micropores present on the surface layer of the panel and all the slopes of the grooved joints with a relatively small amount of paint and a single application when painting the panel , Very efficient and economical.

[Brief description of the drawings]

FIG. 1 is a perspective view of an apparatus used in one embodiment of the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a plan view showing an angle between an air nozzle and a panel.

FIG. 4 is a cross-sectional view showing an air discharge angle with respect to a panel surface.

FIG. 5 is an explanatory view of a main part showing a paint spraying step.

FIG. 6 is an explanatory view of a main part showing a paint spraying step.

FIG. 7 is an explanatory view of a main part showing an air blowing step.

FIG. 8 is an explanatory view of a main part showing an air blowing step.

FIG. 9 is an explanatory view of a main part showing an air blowing step.

FIG. 10 is an explanatory view of a main part showing an air blowing step.

FIG. 11 is a partially broken enlarged sectional view of the ALC panel that has passed through a paint spraying step.

FIG. 12 is a partially cutaway enlarged sectional view of the ALC panel that has passed through an air blowing step.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ALC panel 2a, 2b Air nozzle 3 Undercoat 4 Spray gun 5a, 5b, 6a, 6b Slope of grooved joint 7 Grooved joint 8 Air supply pipe 11a, 11b Holder 15 Roller conveyor 16 Micropore 17 Hollow part X Paint Spraying process Y Air blowing process

Claims (6)

[Claims] 1. A spray gun is used to spray a paint on a surface of a cellular concrete panel having a grooved joint having a substantially V-shaped cross section at least on the surface layer side, and then the paint is cured. In a coating method in which air is sprayed on the paint from an air nozzle having a slit-shaped air outlet before, the spray gun is installed at a predetermined distance from each other and tilted so that a direction in which the paint is sprayed converges to a predetermined position. Using a plurality of spray guns arranged, the nozzle length is longer than the width of the cellular concrete panel as the air nozzle, at least one air blowing direction is directed to the traveling direction of the cellular concrete panel, At least one other air blowing direction is directed to a direction opposite to the traveling direction of the cellular concrete panel. A method for painting a cellular concrete panel, characterized by using an nozzle. 2. The air blowing direction of at least one air nozzle is such that the angle of attack with the panel surface in the advancing direction of the cellular concrete panel is from 90 degrees to 120 degrees, and at least the other air blowing direction is the same. The coating of a cellular concrete panel according to claim 1, wherein the panel is installed at a predetermined distance so that an angle of attack with the panel surface in the traveling direction of the cellular concrete panel is 60 degrees to 90 degrees. Method. 3. A longitudinal direction of an air outlet of an air nozzle and an advancing direction of a cellular concrete panel are inclined at an angle of 15 ° to 75 °, and the air nozzle covers the entire width of the cellular concrete panel. 3. The device according to claim 1, wherein the device is disposed so as to discharge the liquid.
The method for coating a cellular concrete panel according to item 1. 4. The coating of a cellular concrete panel according to claim 1, wherein the distance between the surface of the cellular concrete panel and the air outlet of the air nozzle is 5 to 30 mm. Method. 5. The air pressure from the air nozzle is 30 m.
/ S or more, The coating method of the cellular concrete panel according to any one of claims 1 to 4. 6. The distance between the surface of the cellular concrete panel and the tip of the spray gun is 10 to 50 cm, and the blowing pressure of the spray gun is 3 kgf / cm ² or more. The method for coating a cellular concrete panel according to any one of the above items.