JPH1034060A - Coating method and coating device for building board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly coat the entire part of surfaces including recessed parts of building boards with a curtain flow coater even in the case of coating of the building boards having rugged patterns. SOLUTION: Both first and second oblique conveyors 21, 22 are installed in tow rows. The building boards 11 are transported in the route of the first oblique conveyor 21, a cross conveyor 25 and the second oblique conveyor 22. The cross conveyor 25 parallel moves transversely the building boards 11 transported from the first oblique conveyor 21 toward the inlet side of the second oblique conveyor 22. The first oblique conveyor 21 grades upward to make the cross conveyor 25 side (inlet side) higher and the second oblique conveyor 22 grades downward to make the ejection conveyor side 24 side (outlet side) lower. A coating head 32 of a curtain flow coater 31 is installed above both oblique conveyors 21, 22 and the coating of the building boards 11 by the curtain flow coater 31 is executed twice.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for coating a building board by coating a building board with a curtain flow coater.

[0002]

2. Description of the Related Art In recent years, ceramic architectural boards frequently used are provided with a highly designable concavo-convex pattern, such as tile, brick, and natural stone. A building board having such a concavo-convex pattern is finished by forming the concavo-convex pattern by press molding or the like and painting the surface. 2. Description of the Related Art Conventionally, when a building board having an uneven pattern is entirely coated, a curtain flow coater that has a high paint yield and is capable of high-speed coating is often used.
This curtain flow coater makes a paint curtain film by flowing paint in a curtain form from a paint outflow slit of a paint head installed above a conveyor that transports building boards, and by passing this paint curtain film through the building boards, The entire surface of the building board is painted.

[0003]

As described above, one advantage of using a curtain flow coater is that high-speed coating is possible (normal conveyor speed of 60 to 100 m / min). However, in the case of a building board having a deeply carved uneven pattern, the speed is rather high, and air 14 is drawn in between the inner surface of the concave portion 12 of the building board 11 and the coating film 13 as shown in FIG. This causes the cavity 14 to be formed inside the inside 13. The cavity 14 inside the coating film 13 ruptures during the drying process of the coating film 13, and rupture marks of the cavity 14 are formed in the coating film 13 in a crater shape, or the minute cavities 14 do not burst. As a result, unevenness is formed in the coating film 13 and the coating quality is significantly impaired.

In a curtain flow coater, as shown in JP-A-6-262129, an elastic blade is inclined on the surface of a material to be coated in order to prevent air from being trapped inside the coating film. In some cases, the paint flowing down from the coating head is received by the elastic blade, and the paint is caused to flow down from the elastic blade to the material to be coated. However, in this coating method, since the elastic blade is brought into contact with the surface of the material to be coated to apply the coating, if the entire surface of the material to be coated is a flat surface, the elastic blade is uniformly applied to the entire surface of the material to be coated. Although it may come in contact with it, some effect may be expected, but when painting a building board with uneven pattern, the elastic blade contacts only the convex part of the uneven pattern and does not contact the concave part, so the elastic blade The effect is not uniform, which results in uneven paint.

The present invention has been made in view of such circumstances, and accordingly, it is an object of the present invention to cover the entire surface of a building board including a concave portion with a curtain flow coater even when painting a building board having an uneven pattern. An object of the present invention is to provide a coating method and a coating apparatus for building boards that can be uniformly coated and can improve coating quality.

[0006]

Means for Solving the Problems In the coating by the conventional curtain flow coater, the position of the cavity 14 formed inside the coating 13 as shown in FIG. . This is because the transport speed of the building board 11 is high (normal conveyor speed 60 to 100 m /
This is because the paint applied just before the concave portion 12 jumps out of the upper edge portion of the concave portion 12 in the horizontal direction due to inertia and entrains air inside the coating film 13.

In view of this point, the method for coating a building board according to the present invention uses a curtain flow coater to coat the building board for the first time while conveying the building board on a first inclined conveyor having an uphill or downhill. Is performed, the transport direction of the building board is reversed, and the building board is transported on a second inclined conveyor having a gradient opposite to that of the first inclined conveyor, and a second time is applied to the building board by a curtain flow coater. It is for painting. (Claim 1).

The feature of this coating method is that coating with a curtain flow coater is performed twice, and the transport direction of the building board is reversed between the first coating and the second coating.
The purpose is to incline the direction of transport of the building boards and to reverse the slope of the inclined conveyor between the first coating and the second coating.

[0009] That is, the position of the cavity formed inside the coating applied to the concave portion of the building board in the first coating is only one inner surface of the concave portion. By reversing the transport direction of the building board between
The cavity inside the coating film formed by the second coating is overcoated while being crushed by the second coating, and the coating film is surely formed even in the concave portion.

Moreover, by inclining the transport direction of the building board, excess paint near the concave portion is more likely to flow into the concave portion due to gravity, which also has an advantageous effect on the formation of a coating film in the concave portion. Further, by reversing the inclination of the inclined conveyor between the first coating and the second coating, it is possible to perform two coatings by changing the angle between the transport direction of the building board and the paint curtain film. Thereby, the paint can be evenly distributed over the entire uneven pattern of the building board, and a uniform coating film can be formed on the entire uneven pattern of the building board.

According to a second aspect of the present invention, the building board conveyed from the first inclined conveyor is translated in a horizontal direction by a cross conveyor, and the transport direction of the building board is reversed to move the building board to the first side. Are conveyed on a second inclined conveyor having a gradient opposite to that of the inclined conveyor. In this configuration, the first inclined conveyor and the second inclined conveyor can be arranged compactly in two rows. Moreover, by arranging two inclined conveyors in two rows, it is possible to install a common coating head above the two inclined conveyors, so that one curtain flow coater can efficiently perform two coatings. Can do well.

Further, in the present invention, the inclination angle of each of the first and second inclined conveyors can be adjusted. This makes it possible to adjust the inclination angle of each inclined conveyor to an optimum angle according to the conveying speed, the depth of carving of the uneven pattern of the building board, and the like.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
4 through FIG. First, the configuration of the entire coating apparatus will be described with reference to FIGS. A first inclined conveyor 21 and a second inclined conveyor 22 are arranged in two rows. The first inclined conveyor 21 has an entrance on the left side and an exit on the right side. On the entrance side (left side), a carry-in conveyor 23 for carrying the building board 11 conveyed from the left to the inclined conveyor 21. Is installed. On the other hand, the first inclined conveyor 21 has an entrance on the right side and an exit on the left side, and on the exit side (left side), unloads the building board 11 sent to the exit of the inclined conveyor 22 to the left. An unloading conveyor 24 is installed. On the right side of the two inclined conveyors 21 and 22, the building board 11 carried out from the first inclined conveyor 21 is placed in the second inclined conveyor 21 or 22.
A cross conveyor 25 that translates laterally toward the entrance side of the inclined conveyor 22 is installed.

In this case, the inclination of the first inclined conveyor 21 is ascending such that the side of the carry-in conveyor 23 (entrance side) is low and the side of the cross conveyor 25 (exit side) is high. On the other hand, the inclination of the second inclined conveyor 22 is higher on the cross conveyor 25 side (entrance side), and
There is a downward slope on the 4th side (exit side). Although not shown, the support mechanism of each of the inclined conveyors 21 and 22 is provided with an inclination angle adjusting mechanism for adjusting the inclination angle of each of the inclined conveyors 21 and 22.

The cross conveyor 25 is composed of an X-direction conveyor 26, a Y-direction roller 28 which moves up and down by a lifter 27, and a pusher cylinder 29 which pushes the building board 11 in the horizontal direction (Y direction) to move it in parallel. I have.
Normally, the Y-direction roller 28 retreats below the X-direction conveyor 26, and after the construction board 11 sent to the exit of the first inclined conveyor 21 is carried in by the X-direction conveyor 26, the lifter 27 is operated. The Y-direction roller 28 is protruded above the X-direction conveyor 26, and the building board 11 is placed on the Y-direction roller conveyor 28. In this state,
By operating the pusher cylinder 29 to protrude the pusher 30 connected to the rod 29a, the building board 1
1 is pushed in the lateral direction (Y direction) and moved in parallel, so that the building board 11 faces the entrance of the second inclined conveyor 22. Thereafter, the Y-direction roller 28 is retracted downward, the building board 11 is placed on the X-direction conveyor 26, the X-direction conveyor 26 is rotated in the reverse direction, and the building board 11 is sent out to the second inclined conveyor 22.

The X-direction conveyor 26 may be configured to rotate as a whole in the same direction.
6 is the first inclined conveyor 21 side and the second inclined conveyor 2
It may be divided into two sides and can be independently rotated in the X direction or the opposite direction. In this way, the first inclined conveyor 21 moves from the X-direction conveyor 26
The construction board 11 into the X-direction conveyor 26 and the second
Of the building board 11 to the inclined conveyor 22 can be simultaneously performed, and the building board 11 can be efficiently transported.

First and second inclined conveyors 21 and 22
A coating head 32 of a curtain flow coater 31 is installed above the above. On the lower surface of the coating head 32, a paint outflow slit (not shown) extending in the width direction of the two inclined conveyors 21 and 22 is provided.
Is formed so as to cover the passage area of An opening 33 is formed in each of the inclined conveyors 21 and 22 so as to allow the paint flowing down from the coating head 32 to pass therethrough, and a paint collecting gutter 34 for collecting the paint is provided below the opening 33. The paint is returned to the paint tank 35. The paint in the paint tank 35 is pumped up by a paint pump (not shown) and sent to the coating head 32, from which the paint flows down in the form of a curtain film.

A method of coating the building board 11 using the coating apparatus configured as described above will be described. The building board 11 carried into the first inclined conveyor 21 from the carrying-in conveyor 23 is conveyed obliquely upward by the first inclined conveyor 21, and the building board 11 passes through the paint curtain film flowing down from the coating head 32. By doing so, the building board 11 is subjected to the first coating. At this time, the surplus paint that does not adhere to the building board 11 is received by the paint collection gutter 34 and the paint tank 3
Returned to 5

The building board 11 after the first coating is transferred from the first inclined conveyor 21 to the cross conveyor 25. Thereafter, the lifter 27 is operated to move the Y-direction roller 2.
8 is projected onto the X-direction conveyor 26, and the pusher cylinder 29 is operated to push the building board 11 in the horizontal direction (Y direction) to move the building board 11 in parallel, so that the building board 11 faces the entrance of the second inclined conveyor 22. . Thereafter, the Y-direction roller 28 is retracted downward, the X-direction conveyor 26 is rotated in the reverse direction, and the building board 11 is sent out to the second inclined conveyor 22.
The building board 11 carried into the second inclined conveyor 22 in this manner is conveyed by the second inclined conveyor 22 diagonally downward in a direction opposite to the conveying direction of the first inclined conveyor 21.

Then, the building board 11 conveyed by the second inclined conveyor 22 again passes below the painting head 32, and in the process, the building board 11 is subjected to the second coating. The building board 11 on which the second coating has been completed is sent out from the second inclined conveyor 22 to the unloading conveyor 24, and is conveyed to the next step.

By the way, recent ceramic building boards 11 are:
In many cases, a pattern with high designability, such as a tile tone, a brick tone, and a natural stone tone, is applied. As shown in FIG. More. In the case of painting a building board 11 having such a deeply carved recess 12, when painting is performed by a conventional curtain flow coater, as shown in FIG. The air 14 may be entrained to form the cavity 14 inside the coating 13. The cavity 14 inside the coating film 13 ruptures during the drying process of the coating film 13, and rupture marks of the cavity 14 are formed in the coating film 13 in a crater shape, or the minute cavities 14 do not burst. As a result, unevenness is formed in the coating film 13 and the coating quality is significantly impaired.

In order to solve this drawback, in the present embodiment, the coating by the curtain flow coater 31 is performed twice, and the transport direction of the building board 11 is reversed between the first coating and the second coating. Further, the conveying direction of the building board 11 is inclined, and the inclination of the inclined conveyors 21 and 22 is reversed between the first coating and the second coating.

That is, in the first coating, as shown in FIG. 4, air 15 is entrained between the inner surface of the recess 12 of the building board 11 and the coating 13 to form a cavity 15 inside the coating 13. However, since the transport direction of the building board 11 is inclined upward,
Excess paint near the concave portion 12 flows into the concave portion 12 due to gravity, so that the air 15 is not trapped inside the coating film 13 and the cavity 15 inside the coating film 13 is reduced.

Thereafter, the transport direction of the building board 11 is reversed, and the building board 11 is transported in the downward inclined direction to perform the second coating. In this way, by performing the second coating with the transport direction of the building board 11 reversed, the direction of the inertial force acting on the coating material that has fallen into the recess 12 is changed between the first coating and the second coating. In other words, the cavity 15 inside the coating 13 formed by the first coating is overcoated while being crushed by the second coating, so that the coating 13 is reliably formed in the recess 12. Further, by inverting the inclination of the inclined conveyors 21 and 22 between the first coating and the second coating, the two coatings are performed by changing the angle between the transport direction of the building board 11 and the paint curtain film 16. Can be performed, whereby the paint can be spread evenly over the entire uneven pattern of the building board 11, and a uniform coating film 13 can be formed over the entire uneven pattern of the building board 11, and the coating quality can be improved.

Moreover, in the present embodiment, the use of the cross conveyor 25 allows the first inclined conveyor 21 and the second inclined conveyor 22 to be arranged in two rows and to be compactly installed. Can be satisfied. Further, by arranging the two inclined conveyors 21 and 22 in two rows, a common coating head 32 can be installed above the two inclined conveyors 21 and 22. A stand is sufficient, which also contributes to space saving and cost reduction of the coating device.

However, in the present invention, a separate coating head may be installed for each of the inclined conveyors 21 and 22. In this case, two sets of the paint tank and the paint pump may be provided, but the paint may be distributed from one set of the paint tank and the paint pump to two paint heads.

In the present embodiment, the support mechanism for the first and second inclined conveyors 21 and 22 is provided with an inclination angle adjusting mechanism for adjusting the inclination angle of each inclined conveyor 21 and 22. The inclination angles of the inclined conveyors 21 and 22 are adjusted to an optimum angle in consideration of the carving depth of the uneven pattern of the building board 11 and the viscosity of the paint, or the inclination angle is readjusted while observing the finished state of the coating. And always achieve the best paint finish.

In the present embodiment, the first inclined conveyor 21 has an upward gradient and the second inclined conveyor 22 has a downward gradient. On the contrary, the first inclined conveyor has a downward gradient. The second inclined conveyor may have an upward slope, and in this case, the same effect as that of the present embodiment can be obtained.

In this embodiment, the cross conveyor 2
5, the pusher cylinder 29 is used as a drive source for moving the building board 11 in the horizontal direction (Y direction). The Y-direction roller 28 is driven by a motor to move the building board 11 in the horizontal direction (Y direction).
(Direction).

[0030]

As is apparent from the above description, according to the method for coating a building board of the present invention, the coating with the curtain flow coater is performed twice, and the building is painted between the first coating and the second coating. The transport direction of the board was reversed, the transport direction of the building board was inclined, and the slope of the inclined conveyor was reversed between the first coating and the second coating. Even when coating a certain building board, the entire surface including the concave portion of the building board can be uniformly coated by the curtain flow coater, and the coating quality can be improved (claim 1).

Further, according to the building board coating apparatus of the present invention, both the first and second inclined conveyors can be arranged compactly by arranging them in two rows, and a common common is provided above the two inclined conveyors. A coating head can be installed, so that the space and cost of the coating device can be reduced (claim 2).

In addition, since the inclination angles of the first and second inclined conveyors can be adjusted, the inclination of each inclined conveyor can be adjusted according to the conveying speed, the depth of carving of the uneven pattern of the building board, and the like. The angle can be adjusted to an optimum angle, and the finished state of the paint can always be optimized.

[Brief description of the drawings]

FIG. 1 is a plan view of a coating apparatus showing an embodiment of the present invention.

FIG. 2 is a front view of a coating apparatus.

FIG. 3 is a perspective view of a building board.

FIG. 4 is a partially enlarged longitudinal sectional view of a building board showing a state of formation of a coating film in a concave portion of the building board by the coating method of the present embodiment.

FIG. 5 is a partially enlarged longitudinal sectional view of a building board showing a state of forming a coating film in a concave portion of the building board by a conventional coating method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Construction board, 12 ... Concave part, 13 ... Coating film, 21 ... First inclined conveyor, 22 ... Second inclined conveyor, 23 ... Import conveyor, 24 ... Export conveyor, 25 ... Cross conveyor, 26 ... X direction conveyor 27 lifter, 28 Y-direction conveyor, 29 pusher cylinder, 30 pusher, 31 curtain flow coater, 32 coating head,
34: paint collection gutter, 35: paint tank.

Claims (3)

[Claims] 1. A first painting is performed on a building board by a curtain flow coater while the building board is being conveyed on a first inclined conveyor having an ascending or descending slope, and the conveying direction of the building board is reversed. A coating method for a building board, wherein the building board is painted a second time by a curtain flow coater while the building board is conveyed on a second inclined conveyor having a gradient opposite to that of the first inclined conveyor. 2. A first inclined conveyor that transports a building board in an upward or downward slope direction, and a cross conveyor that horizontally moves a building board carried out of the first inclined conveyor. The building board placed parallel to the first inclined conveyor is installed in two rows, and the transport direction of the building board translated in parallel by the cross conveyor is reversed, and the building board is inclined at a gradient opposite to that of the first inclined conveyor. And a curtain flow coater having a coating head installed over the first and second inclined conveyors. 3. The first and second inclined conveyors include:
3. The building board coating apparatus according to claim 2, wherein the inclination angle can be adjusted.