JP2010063983A - Method of coating building plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of coating a building plate having a reversely tapered convex portion on the surface which enables coating the entire surface of the building plate with a coating, thoroughly without uncoated parts left, while carrying the building plate with the surface upward. <P>SOLUTION: The coating method includes a process of causing the coating in the storage tank to flow down by gravity from an outlet of the storage tank toward the surface of the building plate in the form of a waterfall when the building plate having a reversely tapered convex portion on the surface passes, with the surface upward, below a storage tank for a coating, a process of causing the coating applied to the surface of the building plate to overflow vertically relative to the traveling direction of the building plate and a process of blowing air toward the coated surface of the building plate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for coating a building board having a convex portion having an inversely tapered shape on the surface. More specifically, the present invention relates to a coating method in which a building board having a reverse-tapered convex portion on the surface is conveyed and the coating is sufficiently applied to the entire surface of the building board without leaving any paint.

Generally, in order to fasten a tile, it is necessary to provide a reverse-tapered convex part on the surface of a building board used as a tile base material. Moreover, in order to join a building board with another building board distribute | arranged up and down and / or right and left, the side surface of this building board has an upper solid part and a lower real part.
FIG. 7 shows an example of a building board. The building board A shown in FIG. 7 has a large number of reverse-tapered convex portions A7 protruding on the surface. The width of the convex portion A7 decreases from the top to the bottom, so that the tile can be fastened. Moreover, the side surface of the building board A consists of a side surface having a side surface A5, a side surface A6, an upper solid portion A1 and a side surface A2, and a lower solid portion A3 and a side surface A4. The upper solid part A1 is formed by partially cutting the side surface of the building board A from the back surface side, and since the cutout extends over the entire surface of one side, the upper solid part A1 is formed over the entire surface of one side. ing. Further, the lower solid part A3 is formed by partially cutting a side surface different from the upper solid part A1 of the building board A from the surface side, and the cutout extends over the entire surface of one side surface. A3 is also formed over the entire surface of one side. In addition, the notch of the side surface having the upper solid part A1 is formed larger than the lower solid part A3. Therefore, when constructing the building board A on the outer wall of the building, the upper solid part A1 is fitted with the lower solid part A3 of another building board, and the lower solid part A3 is fitted with the upper solid part A1 of another building board. By making it fit, the some building board A can integrate and can comprise the outer wall of a building.

  As a method of applying the paint to the building board, a brush coating method in which the paint is applied with a brush, a part of the surface of the rotating roll coater is immersed in the paint reservoir, and the paint is applied to the roll surface. A roll coater method in which the coating material is adhered and moved through the roll, a spraying method in which the coating material is blown out from the nozzle at the tip of the spray, and the coating material is overflowed in a film form from the side wall of the paint reservoir. There is a flow coater method in which the paint is passed through.

  The brush coating method is a method in which the brush is placed in a paint reservoir, the paint is attached to the brush, and the surface and the side of the building board to be coated with the brush are stroked and applied, and the surface of the building board is coated with the brush. It is difficult to evenly boil the side and the side and to carry out the building board while conveying it. In addition, it is more difficult for a large-sized building board or a building board having a pattern with unevenness on the surface. Furthermore, in a building board having a convex portion with a reverse taper shape on the surface, it is difficult for the brush to come into contact with the slope of the convex part or near the lower end of the slope of the convex part, and the entire surface of the building board is stroked with a brush. It is difficult to paint, there are places where the painting is insufficient, and there is concern that the physical properties and appearance of the building board will be affected. Even with a building board having an upper solid part and a lower solid part on the side surface, it is difficult for the brush to contact the back surface of the upper solid part, the side surface below it, and the upper side surface of the lower solid part, and the entire side surface of the building board is brushed. However, it is difficult to paint with a boil, and there is a concern that an insufficiently painted part may occur, affecting the physical properties and appearance of the building board. Further, when the brush is directly applied to the building board, it is easily worn and deformed and needs to be replaced immediately.

  In the roll coater method, the paint adhering to the roll is moved to the portion of the building board that is in contact with the roll, so that it can be carried out while conveying the building board to be coated. Further, in the case of a building board having a smooth surface, the paint moves and sufficient coating is obtained. However, in a building board having a reverse taper-shaped convex part on the surface, the slope of the convex part and the vicinity of the lower end of the slope of the convex part cannot contact the roll. There is a possibility that a portion that cannot be moved and coated is generated, which affects the physical properties and appearance of the building board. Further, since the side surface having the upper solid portion or the lower solid portion is also uneven, there is a concern that the roll cannot be in contact with the entire portion, and there are places where the coating is not applied, which affects the physical properties and appearance of the building board. There is. Furthermore, the surface of the building board and the side surface having the real part cannot be painted at the same time, and when the paint is circulated, fragments of the building board base material are often mixed in the paint. There is also a concern that the debris adheres to the roll and a portion where the coating is not applied may occur. In addition, since the application state of the paint is affected by the viscosity of the paint used, the viscosity of the paint must be managed.

Since the spray method sprays paint on the surface of the building board, it can be carried out while conveying the building board to be painted, and even a building board having a pattern with unevenness on the surface can be painted. However, in the building board having the convex part of the reverse taper shape on the surface, the paint cannot be applied to the slope of the convex part or the lower end of the slope of the convex part, and there are places where the coating is insufficient. However, there are concerns that affect the physical properties and appearance of building boards. In addition, there is a method of spraying paint from the diagonally lower part of the building board toward the actual part to paint the side surface with the upper solid part. However, since the paint is sprayed from the lower part, the paint is poorly applied and the spray is easily clogged. There are concerns such as. Another method is to turn the building board upside down and spray the paint on the real part, but it requires a step to turn the building board upside down and is inefficient, depending on the shape of the upper part. There is a concern that the paint will not reach the back and some areas will not be painted. Furthermore, when the paint is circulated and used, fragments of the building board base material are often mixed in the paint, and in that case, the fragments cause nozzle clogging at the tip of the spray, and there are places where the paint is not applied. There are also concerns that arise. Patent Document 1 discloses a method of measuring and managing the flow rate of paint supplied to a spray nozzle by a Coriolis flow meter. However, this method only detects defects such as nozzle clogging in the spray quickly and cannot prevent nozzle clogging. In addition, since the spray method is pressurized and sprayed, foam tends to be generated in the paint, and a large amount of antifoaming agent is required. As a side effect, there is a concern that it may adversely affect the moldability of the coating film, When applying the paint, the paint will be repelled, the adhesiveness of the paint will deteriorate, and the paint application will be affected by the viscosity of the paint used. There are also concerns such as not becoming.
JP 2003-1155 A

  The flow coater method can uniformly apply a paint in the case of a building board having a smooth surface. However, when the flow coater method is carried out while conveying the building board, the paint is applied to the slope of the convex part of the building board having a reverse-tapered convex part on the surface or near the lower end of the convex part of the slope. There is a concern that some parts that cannot be painted and that are not painted will affect the physical properties and appearance of the building board. Also, in order to paint the side with the solid part, the building board is turned upside down and passed through the film-like paint, but the process of turning the building board upside down is required, which is inefficient. Depending on the shape of the real part, there is a concern that the paint does not reach the back of the real part, and there are places where painting is not performed. Furthermore, when the coating material is circulated, bubbles are generated in the coating material, and the film-like coating material is interrupted, and there is a concern that a portion where the coating is not performed may occur. In addition, there are many cases where base material fragments and the like are mixed into the paint, and in this case, there is a concern that the debris clogs the side wall of the paint reservoir and a portion where the coating is not applied may occur.

  The present invention has been made in view of the current situation, and it is sufficient that the building board having a reverse-tapered convex portion on the surface is transported with the surface facing upward without leaving paint on the entire surface of the building board. The object is to provide a coating method to be applied to.

In order to achieve the above object, the present invention described in claim 1 includes a transport line that transports a building board with the surface facing upward, a storage tank provided above the transport line, and a lower surface of the storage tank. A coating method for coating the entire surface of the building board while conveying the building board having a reverse-tapered convex part on the surface with the apparatus provided with a discharge port provided in The step of supplying and storing the paint to the storage tank, the step of dropping the paint of the storage tank by its own weight so as to flow down like a waterfall from the discharge port, and the building board with the surface facing upward Passing the lower part of the storage tank and applying a paint to the surface of the building board; overflowing the paint applied to the surface of the building board in a direction perpendicular to the traveling direction; and Painted building board A coating method characterized by a step of blowing air to the surface.
In the present invention, since the building board is conveyed with the surface facing upward, the surface and side surfaces of the building board are coated, so that the production efficiency is good.
In the present invention, the amount of paint applied from the discharge port of the storage tank is so large that it overflows in the direction perpendicular to the direction of travel after being applied to the surface of the building board. Even with a building board having a convex portion, the paint can be sufficiently applied to the entire surface without being left uncoated, and the paint sufficiently penetrates into the building board, so that the painted building board is difficult to absorb water.
Furthermore, in the present invention, the paint applied to the surface of the building board is overflowed in a direction perpendicular to the traveling direction, and further air is blown onto the surface of the building board, so that the paint spreads over the entire surface of the building board. At the same time, the surplus paint is removed from the surface of the building board, and the surface of the building board is uniformly coated without being left behind. In particular, the paint tends to accumulate near the lower end of the slope of the convex portion having the inverse taper shape, but since the air is blown, the paint does not collect and the entire surface of the building board is uniformly coated.
Even when the paint is circulated and used, the amount of paint applied is large, so that it is not easily affected by bubbles generated, and the problem that the applied paint is interrupted does not occur. In addition, since the paint is dropped by its own weight so as to flow down like a waterfall, it is not easily affected even if debris of the base material is mixed into the paint, and is not easily affected by the viscosity of the paint to be used. There is also an effect that the energy cost is increased and an energy cost can be kept low.

The invention according to claim 2 is the coating method according to claim 1, wherein the amount of the paint that is dropped by its own weight so as to flow down like a waterfall from the discharge port toward the surface of the building board is the discharge port. The coating method is characterized by being 40 liters / minute or more per 1 m of the width. The width of the discharge port is the width in the direction perpendicular to the traveling direction of the building board. When the width of the discharge port is 0.5 m, the amount of paint is 20 liters / minute or more. When the discharge port has a width of 120 liters / minute or more per 1 m of width, the amount of the coating material supplied to the convex portion having an inversely tapered shape is increased, and the convex portion is more easily coated.
In the present invention, since the amount of the coating material falling by its own weight from the discharge port is set to 40 liters / minute or more per 1 m of the width of the discharge port, the entire surface of the building board having the reverse tapered convex portion is surely painted. be able to. In addition, when a sufficient amount of paint overflows and the building board has an upper solid portion and a lower solid portion, the side surface of the upper solid portion, the back surface of the upper solid portion, and the upper solid portion The lower side surface, the surface of the lower solid portion, the side surface of the lower solid portion, and the side surface above the lower solid portion can be reliably coated. Furthermore, the paint sufficiently penetrates into the building board, and the building board after painting becomes difficult to absorb water. The paint tends to accumulate near the lower end of the slope of the reverse tapered convex portion, but since the air is blown, the paint does not collect and the entire surface of the building board is uniformly coated.

Invention of Claim 3 is the coating method of Claim 1 or Claim 2, The said building board has an upper solid part and a lower solid part on the side surface, and it is perpendicular | vertical with respect to the advancing direction. With the paint overflowing in the direction, the side surface of the upper part of the building board, the back surface of the upper part, the side surface of the building board below the upper part, and the surface of the lower part of the building board The painting method is characterized in that the side surface of the lower solid part and the side surface of the building board above the lower solid part are painted.
In the present invention, since the paint applied to the surface of the building board is overflowed in the direction perpendicular to the traveling direction while the building board is being conveyed, the side of the upper solid part of the building board and the upper solid part The overflowed paint is caught in the back surface and the side surface of the building board below the upper solid part, and without reversing the building board, the side surface of the upper solid part of the building board and the back surface of the upper solid part And the side of the building board below the upper solid part can be sufficiently painted. In addition, the surface of the lower part of the building board, the side of the lower part, and the side of the building board above the lower part are sufficiently painted by the paint overflowing to the side having the lower part. You can also In addition, when the surface of the upper solid part is not a part of the surface of the building board, the surface of the upper solid part can be sufficiently coated with the overflowed paint.

  According to the coating method of the present invention, a building board having a reverse-tapered convex portion on the surface is conveyed with the surface facing upward, and the paint is not left uncoated on the entire surface of the building board and a paint pool is generated. And can be applied uniformly. Even if the building board has a side surface having an upper solid part and a side surface having a lower solid part, the surface and side surface of the lower solid part, the side surface of the building board above the lower solid part, and the upper The paint can be sufficiently applied without leaving any paint on the side and back of the real part and the side of the building board below the upper real part. Furthermore, even when the paint is used in a circulating state, it is not easily affected by the generated bubbles, and the problem that the applied paint is interrupted does not occur. In addition, it is difficult to be affected even if base material debris is mixed in the paint, and it is also less susceptible to the viscosity of the paint used. There is also an effect. Furthermore, the paint can sufficiently penetrate the entire surface of the building board, and there is an effect that a building board that hardly absorbs water can be obtained.

  Hereinafter, with respect to the embodiments of the present invention, an example of equipment for carrying out the present invention will be described first, and then the coating method of the present invention using the equipment will be described.

FIG. 1 is a side sectional view showing an example of equipment for carrying out the painting method of the present invention, and FIG. 2 is a sectional view of the equipment shown in FIG. .
In the equipment shown in FIGS. 1 and 2, the building shown in FIG. 7 has a reverse-tapered convex portion A7 on the surface, and an upper solid portion A1 and a lower solid portion A3 at the end. The board A is placed on the conveyance line with the surface facing upward, and the building roller A is conveyed in the arrow Y direction on the conveyance line by rotating the conveyance roller H in the arrow X direction. The building board A is 3030 mm long and 463 mm wide, and is transported so that the width on the vertical side with respect to the traveling direction is 463 mm.
A storage tank C for storing the coating material B to be applied is provided above the transport line, and the coating material B to be applied is supplied to the storage tank C as needed. A storage amount management unit J is installed inside the storage tank C. The storage amount management unit J is a sphere having an electrical signal transmission unit, and is usually connected to the ceiling of the storage tank C with a chain and floats on the stored paint B. When suspended from the ceiling, that is, when not floating on the paint B, an electrical signal is transmitted from the electrical signal section, and the line is set to be stopped. The storage amount management unit J prevents the production from being continued in a state where the paint B is not applied to the building board A.
A discharge port F is provided on the lower surface of the storage tank C. The width on the vertical side with respect to the traveling direction of the discharge port F is 520 mm, which is larger than the width 463 mm on the vertical side with respect to the traveling direction of the building board A. Further, the discharge port F has a structure in which the width on the side parallel to the traveling direction is adjusted by the discharge port adjusting material E. Specifically, the discharge port adjusting material E can move in the traveling direction, and the width on the parallel side to the traveling direction of the discharge port F is adjusted by adjusting the position of the discharge port adjusting material E. In this facility, the amount of paint B to be dropped by its own weight so as to flow down like a waterfall toward the surface of the building board A conveyed from the discharge port F is 60 liters / minute with respect to the traveling direction of the discharge port F. The width on the parallel side was adjusted.
Below the transport line, there is provided a recovery tank I for recovering excess paint B that has been discharged from the discharge port F but has not been applied to the building board A. The paint B recovered in the recovery tank I is a pump. The water is pumped up and returned to the storage tank C for reuse.
A storage amount adjustment port D is provided inside the storage tank C. The storage amount adjustment port D is provided above the discharge port F and is connected to the collection tank I. That is, the storage amount adjustment port D is for discharging the paint B in the storage tank C directly to the recovery tank I, and the discharge capacity of the paint B from the storage amount adjustment port D (discharge amount of the paint B per hour). Is greater than the amount of paint B supplied per hour. Due to the storage amount adjusting port D, a certain amount or more of the paint B is not stored in the storage tank C.
An air knife K is provided on the traveling direction side of the storage tank C. Air is supplied to the air knife K, and high-pressure air can be blown from the tip nozzle of the air knife K. In this equipment, when the building board A with the coating material B applied on the surface passes below the air knife K, air is blown from the tip nozzle to spread the coating material B on the surface of the building board A as a whole and the surplus amount. The paint B can be removed by air, and a paint liquid film having a uniform thickness can be formed on the surface of the building board A. As shown in FIG. 2, the width on the vertical side with respect to the traveling direction of the air knife K is wider than the width on the vertical side with respect to the traveling direction of the building board A. Since it is installed so as to be obliquely crossed with respect to the traveling direction, the blowing of air to the building board A is performed obliquely with respect to the traveling direction. When high-pressure air is blown in this state, the surplus paint crosses the building board A diagonally and finally falls from the end of the building board A, so that the surplus paint B is reliably removed, and the paint liquid film Can be formed. Further, even when there is unpainted paint on the building board A, the paint can be replenished with an excess paint to form a paint liquid film. A recovery tank I is provided below the air knife K, and the paint B removed from the building board A by the air knife K is recovered in the recovery tank I and reused.

Next, the coating method of the present invention using the equipment shown in FIGS. 1 and 2 will be described.
First, by rotating the transport roller H in the arrow X direction, the building board A is transported on the transport line in the arrow Y direction with the surface facing upward.
On the other hand, the coating material B is supplied and stored in a storage tank C provided above the transport line.
Subsequently, the paint B stored in the storage tank C is dropped by its own weight so as to flow down like a waterfall from the discharge port F provided on the lower surface of the storage tank C. Note that the amount of the coating material B to be dropped by its own weight is 60 liters / minute.
Subsequently, the surface of the building board A is passed by passing the building board A below the discharge port F with the surface facing up, and supplying the paint B falling by its own weight from the discharge port F to the surface of the building board A. Paint B is applied to In addition, the width | variety of the perpendicular | vertical side with respect to the advancing direction of the discharge port F is 520 mm, is larger than the width | variety of 463 mm of the perpendicular | vertical side with respect to the advancing direction of the building board A, Since the amount of B is as large as 60 liters / minute, the paint B that has been dropped by its own weight so as to flow down from the discharge port F in a waterfall shape, the entire surface including the convex portion A7 of the reverse taper shape of the building board A, and the lower solid part The surface and side surface of A3 and the side surface of the building board A above the lower solid part A3 are sufficiently painted, and overflow in the direction perpendicular to the traveling direction, and the side surface of the upper solid part A1 of the building board A; The back surface of the upper solid part A1, the side surface A2 below the upper solid part A1, the side surface A4 above the lower solid part A3, the surface of the lower solid part A3, and the side surface of the lower solid part A3 are also sufficient. Can be painted. In particular, a large amount of paint B is applied to all of the inverted taper-shaped convex portions A7 of the building board A, and the paint B is not left uncoated on all the slopes of the convex portion A7 and the lower end of the slope. Can be applied. That is, the entire surface of the building board A, the surface and side surface of the lower solid part A3, the side surface of the building board A above the lower solid part A3, the side surface and back surface of the upper solid part A1, and the lower side of the upper solid part A1 It is possible to sufficiently apply the paint B to the side surface of the building board A without leaving any paint.
Subsequently, the building board A to which the coating material B is applied is passed through the lower side of the air knife K with the surface facing upward, and high pressure air is blown onto the surface of the building board A, whereby the coating material B on the surface of the building board A is applied. And the excess paint B is removed to form a paint liquid film having a uniform thickness on the surface of the building board A.
The paint B discharged from the outlet F but not applied to the building board A, the paint B overflowing from the building board A, and the paint B removed from the building board A by the air knife K are collected in the collection tank I. Then, it is pumped up by the pump, returned to the storage tank C, and reused.

Furthermore, another example of the equipment which implements the coating method of this invention is shown.
FIG. 3 is a side sectional view showing another example of equipment for performing the coating method of the present invention, and FIG. 4 is a sectional view of the equipment shown in FIG. It is.
3 and 4 differs from the equipment shown in FIGS. 1 and 2 in that a pair of outlet adjustment materials E are provided on both sides of the outlet F, and the width of the outlet F is Can be adjusted from both sides. Others are the same as the equipment shown in FIG. 1 and FIG. 2, and also in this equipment, the amount of the paint B that is dropped by its own weight so as to flow down like a waterfall toward the surface of the building board A conveyed from the discharge port F is small. The width on the parallel side with respect to the traveling direction of the outlet F was adjusted so as to be 60 liters / minute. Further, an air knife K capable of blowing high-pressure air from the tip nozzle is provided on the traveling direction side of the storage tank C, and the building board A with the coating material B applied on the surface is below the air knife K. In passing, air can be blown from the tip nozzle.

Next, the coating method of the present invention using the equipment shown in FIGS. 3 and 4 will be described.
In the coating method using the equipment shown in FIGS. 3 and 4, as in the coating method using the equipment shown in FIGS. Was transported in the direction of the arrow Y with the surface facing up, the paint B was supplied to and stored in the storage tank C provided above the transfer line, and stored in the storage tank C from the discharge port F The paint B is dropped by its own weight so as to flow down like a waterfall at a discharge amount of 60 liters / minute, and the building board A is passed through the lower side of the discharge port F with the surface facing up, and the discharge port F is formed on the surface of the building plate A. By supplying the coating material B falling from its own weight, the coating plate B is applied to the entire surface of the building board A including the reverse-tapered convex portion A7 and overflowed in the direction perpendicular to the traveling direction. Side of upper solid part A1 and back of upper solid part A1 When a side A2 in the below UeMinoru section A1, the side surface A4 in above the Shitami unit A3, and the surface of the Shitami section A3, to fully paint even the sides of Shitami portion A3.
Subsequently, the building board A to which the coating material B is applied is passed through the lower side of the air knife K with the surface facing upward, and high pressure air is blown onto the surface of the building board A, whereby the coating material B on the surface of the building board A is applied. As a result, the excess paint is removed and a paint liquid film having a uniform thickness is formed on the surface of the building board A.
The paint B discharged from the outlet F but not applied to the building board A, the paint B overflowing from the building board A, and the paint B removed from the building board A by the air knife K are collected in the collection tank I. Then, it is pumped up by the pump, returned to the storage tank C, and reused.
In the coating method using the equipment shown in FIG. 3 and FIG. 4 as well, as in the coating method using the equipment shown in FIG. 1 and FIG. , And the paint B can be applied to the vicinity of the lower end of the slope without leaving an unpainted surface. Therefore, the entire surface of the building board A, the surface and side surfaces of the lower solid part A3, and the building board A above the lower solid part A3. The coating B can be sufficiently applied to the side surface, the side surface and the back surface of the upper solid part A1, and the side surface of the building board A below the upper solid part A1 without leaving any paint. Further, since the paint B on the surface of the building board A is spread over the entire surface by the air knife K and the excess paint is removed, a paint liquid film having a uniform thickness can be formed on the surface of the building board A.

Furthermore, another example of the equipment which implements the coating method of this invention is shown.
FIG. 5 is a side sectional view showing still another example of equipment for carrying out the coating method of the present invention, and FIG. 6 is a sectional view of the equipment shown in FIG. FIG.
The equipment shown in FIGS. 5 and 6 has a width on the vertical side with respect to the traveling direction of the discharge port F of the equipment shown in FIGS. The outlet is changed to the same size as the width, and further, the amount of paint B to be dropped by its own weight so as to flow down like a waterfall toward the surface of the building board A conveyed from the outlet F is 120 liters / minute. The width on the side parallel to the traveling direction of F was adjusted. Other than that, the equipment is the same as that shown in FIGS. 1 and 2, and an air knife K capable of blowing high-pressure air from the tip nozzle is provided on the traveling direction side of the storage tank C. When the building board A to which B is applied passes below the air knife K, air can be blown from the tip nozzle.

Next, the coating method of the present invention using the equipment shown in FIGS. 5 and 6 will be described.
Also in the coating method using the equipment shown in FIGS. 5 and 6, as in the coating method using the equipment shown in FIGS. 1 and 2, the transport roller H is rotated in the direction of the arrow X, and the building board A Was transported in the direction of the arrow Y with the surface facing up, the paint B was supplied to and stored in the storage tank C provided above the transfer line, and stored in the storage tank C from the discharge port F The paint B is dropped by its own weight so as to flow down like a waterfall, the building board A is passed through the lower side of the discharge port F with the surface facing up, and the paint B that is falling by its own weight from the discharge port F on the surface of the building board A By supplying, paint B is applied to the entire surface of the building board A including the reverse-tapered convex portion A7, and overflows in the direction perpendicular to the traveling direction. However, in this coating method, the width on the vertical side with respect to the traveling direction of the discharge port F is set to the same size as the width on the vertical side with respect to the traveling direction of the building board A, as shown in FIGS. Since the width is smaller than the width on the vertical side with respect to the traveling direction of the discharge port F of the painting method using the equipment, the paint is dropped by its own weight so as to flow down like a waterfall toward the surface of the building board A conveyed from the discharge port F. The amount of B is increased to 120 liters / minute, and the amount of paint B that overflows in the direction perpendicular to the traveling direction is increased compared to the coating method using the equipment shown in FIGS. And, by the paint B overflowed in the direction perpendicular to the traveling direction, the side surface of the upper solid part A1 of the building board A, the back surface of the upper real part A1, the side surface A2 below the upper real part A1, and the lower real The side surface A4 above the portion A3, the surface of the lower solid portion A3, and the side surface of the lower solid portion A3 are also sufficiently painted. In addition, since the amount of the coating material B to be dropped by its own weight is larger than the coating method using the equipment shown in FIGS. 1 and 2, more coating material B is applied to the reverse taper-shaped convex portion A7. The coating material B can be applied without leaving any coating on all the slopes of the reverse taper-shaped convex part A7 and the vicinity of the lower end of the slope.
Subsequently, the building board A to which the coating material B is applied is passed through the lower side of the air knife K with the surface facing upward, and high pressure air is blown onto the surface of the building board A, whereby the coating material B on the surface of the building board A is applied. As a result, the excess paint is removed and a paint liquid film having a uniform thickness is formed on the surface of the building board A.
In the coating method using the equipment shown in FIGS. 5 and 6 as well, as with the coating method using the equipment shown in FIGS. , And the paint B can be applied to the vicinity of the lower end of the slope without leaving an unpainted surface. Therefore, the entire surface of the building board A, the surface and side surfaces of the lower solid part A3, and the building board A above the lower solid part A3. The coating B can be sufficiently applied to the side surface, the side surface and the back surface of the upper solid part A1, and the side surface of the building board A below the upper solid part A1 without leaving any paint. Further, since the paint B on the surface of the building board A is spread over the entire surface by the air knife K and the excess paint is removed, a paint liquid film having a uniform thickness can be formed on the surface of the building board A.

Next, using a ceramic siding board as the building board shown in FIG. 7, the coating method of the present invention was compared with the conventional spray method and the flow coater method. First, each of the sealer-coated plates subjected to each coating method using a paint made of an acrylic emulsion resin was prepared. That is, the ceramic method siding plate is subjected to the coating method of the present invention using the apparatus shown in FIGS. 1 and 2, and a sealer coating plate coated by the coating method of the present invention is prepared. A sealer-coated plate coated by a spray method was prepared using a spray method on the plate, and a sealer-coated plate painted by a flow coater method was prepared using a flow coater method on another ceramic siding plate. And the coating state of the surface and side surface of each sealer coating board was confirmed.
Furthermore, the coating material which consists of another acrylic emulsion resin was apply | coated to the surface of each sealer coating board by the same setting, it was made to dry, and each coating board was prepared. And the surface water absorption was measured about each coating board, and the comparison was performed. The surface water absorption is measured by a frame placing method, and a 0.2 × 0.2 m frame is provided on the surface of the coated plate, and the sample is allowed to stand for 24 hours with a certain amount of water in the frame. This is a value obtained by calculating the weight change of the front and rear coated plates according to Equation 1.

The sealer-coated plate subjected to the coating method of the present invention, even immediately after performing the coating method of the present invention, on the surface and the slope of the reverse tapered convex portion on the surface of the sealer-coated plate, and near the lower end of the slope. The paint was applied without any unpainted areas, and no uncoated areas were found on the surface of the sealer-coated plate. Also, leave no paint on the surface and side surfaces of the lower solid part of the sealer coating plate, the side surfaces above the lower solid part, the side surfaces and rear surface of the upper solid part, and the side surfaces below the upper solid part. It was applied.
Furthermore, the surface water absorption of the coated plate subjected to the coating method of the present invention was 190 g / m ² .

In the case of a sealer-coated plate that has been subjected to a conventional spraying method, immediately after the spraying method is applied, there is no paint remaining on the slope of the reverse-tapered convex portion on the surface of the sealer-coated plate and the lower end of the slope. In addition, unpainted paint was also observed on the back surface of the upper solid part and on the side surface below the upper solid part.
Moreover, the surface water absorption of the coating board which performed the spray method was 840 g / m < ² >, and was a result which is easy to absorb water compared with the coating board which performed the coating method of this invention.

In the sealer-coated plate that has been subjected to the conventional flow coater method, immediately after performing the flow coater method, the slope of the reverse taper-shaped convex part on the surface of the sealer-coated plate and the vicinity of the lower end of the slope are sprayed. There were many unpainted areas left. In addition, unpainted paint was also observed on the back surface of the upper solid part and on the side surface below the upper solid part.
Moreover, the surface water absorption of the coated board which performed the flow coater method was 850 g / m < ² >, and it was a result which is easy to absorb water compared with the coated board which performed the coating method of this invention.

Although one embodiment of the present invention has been described above, the present invention is not limited thereto, and various modifications can be made within the scope of the invention described in the claims. For example, FIG. 8 shows another building board A ′ having another convex portion A′7 having a reverse tapered shape on the surface, but the coating method of the present invention can also be applied to the building board A ′.
In addition, the building board A ′ shown in FIG. 8 has the shape of the upper solid part A′1, the side surface A′2 below the upper solid part A′1, and the lower solid part A′3. 7 different from the shape of the upper solid part A1, side face A2, and lower solid part A3 of the building board A shown in FIG. 7, and another cutout between the upper solid part A'1 and the side face A'2 below it. Although A′9 is formed, the painting method of the present invention is the upper solid part A′1, the side face A′2, the lower solid part A′3, the side face A′4, and the cutout A′9 of the building board A ′. The shape of the side surface in the width direction including the upper solid portion and the lower solid portion formed on the side surface in the width direction is not limited.

  As described above, according to the coating method of the present invention, while transporting the building board having the convex portion of the reverse taper shape on the surface with the surface facing upward, the paint plate is not left uncoated on the entire surface of the building board, And it can apply | coat uniformly, without generating a paint pool. Even if the building board has a side surface having an upper solid part and a side surface having a lower solid part, the surface and side surface of the lower solid part, the side surface of the building board above the lower solid part, and the upper The paint can be sufficiently applied without leaving any paint on the side and back of the real part and the side of the building board below the upper real part. Furthermore, even when the paint is used in a circulating state, it is not easily affected by the generated bubbles, and the problem that the applied paint is interrupted does not occur. In addition, it is difficult to be affected even if base material debris is mixed in the paint, and it is also less susceptible to the viscosity of the paint used. There is also an effect. Furthermore, the paint can sufficiently penetrate the entire surface of the building board, and there is an effect that a building board that hardly absorbs water can be obtained.

It is side sectional drawing which showed an example of the equipment which enforces the coating method of this invention. It is sectional drawing which looked at the cross section of the 1-1 'line of the installation shown in FIG. 1 from the upper side. It is side sectional drawing which showed another example of the equipment which enforces the coating method of this invention. It is sectional drawing which looked at the cross section of the 1-1 'line of the installation shown in FIG. 3 from the upper side. It is the sectional side view which showed another example of the equipment which enforces the coating method of this invention. It is sectional drawing which looked at the cross section of the 1-1 'line | wire of the installation shown in FIG. 5 from the upper side. It is the figure which showed an example of the building board. It is the figure which showed another example of the building board.

Explanation of symbols

A Building board with irregularities on the surface A1 Upper solid part A2 Side face A3 Lower solid part A4 Side face A5 Side face A6 Side face A7 Convex part B Paint C Storage tank D Storage amount adjustment port E Discharge port adjustment material F Discharge port H Conveyance roller I Recovery Tank J Storage volume management department K Air knife

Claims (3)

Use a device equipped with a transport line that transports the building board with the surface facing upward, a storage tank provided above the transport line, and a discharge port provided on the lower surface of the storage tank. It is a coating method for coating the entire surface of the building board while conveying the building board having a tapered convex portion with the surface facing upward,
Supplying and storing paint in the storage tank;
A process of dropping the paint of the storage tank by its own weight so as to flow down like a waterfall from the discharge port;
A step of passing the lower side of the storage tank with the surface facing up, and applying a paint to the surface of the building board;
Overflowing the paint applied to the surface of the building board in a direction perpendicular to the traveling direction;
And a step of blowing air onto the surface of the painted building board. The coating method according to claim 1,
The coating method according to claim 1, wherein an amount of the coating material dropped by its own weight so as to flow down like a waterfall from the discharge port toward the surface of the building board is 40 liters / minute or more per 1 m of the width of the discharge port. It is the coating method according to claim 1 or claim 2,
The building board has an upper solid part and a lower solid part on a side surface, and a paint that overflows in a direction perpendicular to the traveling direction causes a side surface of the upper solid part of the building board, and a back surface of the upper solid part, Painting the side of the building board below the upper solid part, the surface of the lower solid part of the building board, the side of the lower solid part, and the side of the building board above the lower solid part A painting method characterized by

Images