JP4757925B2 - Porous material coating method and porous material coating apparatus - Google Patents

Description

  The present invention relates to a coating method and a coating apparatus for three surfaces of an upper surface and both side surfaces of a porous material.

  Conventionally, an outer wall material that has been produced and processed in a factory and is attached to an outer wall portion of a building has been developed. Among them, as an outer wall material that is lightweight and easy to construct, a porous material (a material having irregularities and bubbles on the surface, for example, lightweight cellular concrete) is often used. In the following description, the lightweight cellular concrete board is referred to as an ALC board. ALC is an abbreviation for Autoclaved Light-Weight Concrete.

  In general, in an ALC plate, after forming a design uneven pattern on the surface, the surface is painted to ensure waterproofness and improve the appearance. Since the ALC plate has many bubbles on the surface, if it is applied by a normal coating method with a spray method suitable for mass production, the inside of the bubble will not be painted, and it will be in a state containing an air reservoir inside this bubble After the coating film is formed, the air reservoir is broken, and the portion is not painted or the coating film is thin.

  Patent Document 1 discloses a coating method and a coating apparatus for an upper surface of a flat ALC plate for improving such a problem. That is, using the coating apparatus 20 of FIG. 5, as shown in the flow of FIG. 6, the spray coating unit 32 sprays the paint onto the heated flat ALC plate 30 transported by the transport roller 73. After coating, excess air is blown off and removed by air blow in the next air blow chamber 33, and then the air reservoir in the bubbles is expanded and ruptured by reducing the pressure in the next decompression chamber 34. Finally, the paint is poured into the indentation exposed by rupturing by air pressure in the pressurizing chamber 35. In this way, the coating film 36 that uniformly covers the surface of the ALC plate 30 can be formed.

JP 2002-282762 A

  As described above, Patent Document 1 discloses a coating method for forming a uniform coating film on the upper surface of the ALC plate. However, the coating method for forming a coating film having excellent uniformity on the upper surface and the side surface of the ALC plate is disclosed. No method is disclosed.

  On the other hand, painting may be performed on two surfaces of the upper surface and side surfaces of the ALC plate, or may be performed on three surfaces of the upper surface and both side surfaces of the ALC plate. An example of the former is a window frame, and an example of the latter is a pair of U-shaped members that surround an independent pillar. In consideration of production efficiency, it is necessary to complete the coating process on two or three sides by one coating, and the side surface of the ALC plate is coated in a state perpendicular to the upper surface.

  When coating is performed on the upper surface and side surfaces of the ALC plate in this way, the paint is more likely to flow down on the side surfaces standing perpendicular to the upper surface, and the amount of coating is further reduced. Therefore, how to ensure uniform application amount of the paint on the upper surface and both side surfaces of the ALC plate with high production efficiency becomes a problem.

  In addition, when the top and side surfaces of the ALC plate to which the paint was applied were air blown with an air knife, the paint swelled at the end of the top surface of the ALC plate depending on how the paint on the top and side surfaces flowed depending on the air blowing condition of the air blow. The puddle remains and may cause a problem in appearance.

  The main ones of the inventions disclosed in the present invention are as follows.

  The porous material coating method of the present invention is a method of coating a porous material having three surfaces, an upper surface and both side surfaces, and a step of spraying a paint onto the upper surface and both side surfaces of the porous material, and the paint is sprayed A step of applying a first air blow to the upper surface for pouring the paint on the upper surface of the porous material into the both side surfaces; and after pouring the paint from the upper surface to the both side surfaces by the first air blow, Performing a second air blow on both side surfaces.

  Further, in addition to the above configuration, the step of performing the second air blow is a step of blowing air toward the both side surfaces obliquely downward with respect to the upper surface.

  Further, the porous material coating apparatus of the present invention is a porous material coating device having three surfaces of an upper surface and both side surfaces, an injection coating unit that sprays paint onto the upper surface and both side surfaces of the porous material, and the spray material A first air blow unit for applying a first air blow to the upper surface in order to flow the paint on the upper surface of the porous material coated at the coating unit into the both side surfaces; and a paint by the first air blow unit. A second air blow part for applying a second air blow to the both side surfaces after flowing from the upper surface to the both side faces; and the porous material from the spray coating part to the first and second air blow parts. And a conveying device for conveying.

  Further, in addition to the above configuration, the second air blow section is configured to blow air toward the both side surfaces obliquely downward with respect to the upper surface.

  According to the present invention, when a porous material is applied, the coating amount of the upper surface and the side surface can be made uniform, and excellent waterproof performance can be realized.

  Further, it is possible to suppress the occurrence of paint accumulation and protrusions at the upper end of the porous material.

It is a process flowchart which shows the coating method of the ALC board by embodiment of this invention. It is a figure which shows the coating method of the ALC board by embodiment of this invention. It is a figure which shows the structure of the air blow part in the coating device of the ALC board by embodiment of this invention. It is a top view which shows the other structure of the air blow part in the coating device of the ALC board by embodiment of this invention. It is the schematic which shows the structure of the coating apparatus of the conventional ALC board. It is a schematic flowchart which shows the coating method of the conventional ALC board.

  Hereinafter, embodiments of the present invention will be described. FIG. 1 shows a coating process flow of the ALC plate. First, an ALC plate 1 having an upper surface 1a and both side surfaces 1b and 1b is prepared. Here, both side surfaces 1b and 1b are two side surfaces 1b in contact with the end of the upper surface 1a of the ALC plate 1 which is a rectangular parallelepiped, and both side surfaces 1b and 1b face each other.

  And as shown to Fig.1 (a), the uneven | corrugated pattern 2 is formed in the three surfaces of the upper surface 1a of the ALC board 1, and both side surface 1b, 1b. Next, as shown in FIG. 1B, paint is spray-applied to the upper surface 1a of the ALC plate 1 and the three side surfaces 1b and 1b. And as shown in FIG.1 (c), the upper surface 1a of the ALC board 1 with which the coating material was apply | coated, both side surfaces 1b, 1b are air blown (air spraying), and the uniform coating film thickness is aimed at.

  As will be described in detail below, the characteristic configuration of the present invention is a coating film on the upper surface 1a and both side surfaces 1b and 1b of the ALC plate 1 by devising the shape, installation position and usage method of the air knife for air blowing. This is to make the thickness uniform.

  Hereinafter, the coating method of the ALC plate 1 according to the present embodiment will be described in detail with reference to FIGS. First, as shown in FIG. 2A, the ALC plate 1 is prepared, and grooves are formed on the surface thereof using a milling machine or the like. Then, various uneven | corrugated patterns 2 are formed by peeling the ALC board 1 around the groove | channel using the peeling apparatus with a crushing nail | claw etc. centering on the groove | channel. By using the ALC plate 1 having such a concavo-convex pattern 2 as the outer wall material, the appearance of the building becomes attractive. In FIG. 2 (a), only a linear pattern 2 is shown for simplification of the drawing.

  Next, the ALC plate 1 is placed on a grid-like pallet (not shown) and carried into the coating apparatus by a conveyance roller (an example of a conveyance device). This transport device is basically the same as that shown in FIG. About 98% of the paint sprayed in the spray coating part is not applied to the ALC plate 1 and flows down as extra paint, so it is wasted. This is to increase the paint recovery rate by flowing into the lower tank through the grid pallet.

  The ALC plate 1 carried into the coating apparatus is subjected to coating and air blow processing, which will be described later, while being continuously transported from the spray coating section to the air blow chamber by a transport roller. First, the ALC plate 1 carried into the coating apparatus is as shown in FIG. 2 (b) in a spray coating section having a spray nozzle (not shown) installed on the upper surface 1a and facing both side surfaces 1b and 1b. Further, the upper surface 1a and both side surfaces 1b, 1b are coated with a paint by spray coating. Several spray nozzles are installed on the upper surface 1a and both side surfaces 1b and 1b of the spray coating portion, and as shown by the arrows, the paint is sprayed substantially vertically onto the upper surface 1a and both side surfaces 1b and 1b of the ALC plate 1. .

  In addition, as for the injection nozzle, what injects from diagonally as shown by the arrow is also installed so that a coating material may be applied also to the corner part vicinity where the upper surface 1a of the ALC board 1 and both side surfaces 1b and 1b cross. Naturally, both side surfaces 1b and 1b of the ALC plate 1 stand perpendicular to the floor surface on which the coating apparatus is installed, and the applied paint is easy to flow, so the amount of paint applied is less than that of the upper surface 1a. . Specifically, it was confirmed that the coating film thickness was 150 μm to 200 μm on the upper surface 1a and about 50 μm on both side surfaces 1b and 1b.

  The ALC plate 1 to which the paint has been applied is carried into the air blow chamber by the transport roller, and as shown in FIG. 2 (c), the upper surface 1a and both side surfaces 1b, 1b are respectively indicated by arrows from an air knife (not shown). Air blown with air blown out. High pressure air is supplied to the air knife from an air blower 4 described later. By air blowing, excess paint is blown out from the upper surface 1a and both side surfaces 1b and 1b, and the coating on the both side surfaces 1b and 1b having a smaller coating amount than the upper surface 1a is layered with the paint blown down from the upper surface 1a. Also overlap and cover. As a result, the coating amount supplied from the upper surface 1a can make the coating amount applied to the both side surfaces 1b and 1b, which is insufficient compared to the upper surface 1a at the time of spray coating, to a sufficient amount. This is a characteristic configuration of the present invention and will be described in detail below.

  In FIG. 3, the arrangement of the air knives 3a and 3b with respect to the upper surface 1a and both side surfaces 1b and 1b of the ALC plate 1 and the air blowing direction during air blowing are indicated by arrows. 3A is a side view of the air blow chamber into which the ALC plate 1 is carried, FIG. 3B is a plan view thereof, and FIG. 3C is a front view thereof. The illustration of the conveyance roller and the like is omitted. As shown in the figure, air is blown out in the direction opposite to the traveling direction of the ALC plate 1 indicated by the arrow a, so that as the ALC plate 1 travels, the excess paint moves in the direction opposite to the traveling direction of the ALC plate 1. Extruded and removed.

  The air knife 3a disposed above the upper surface 1a of the ALC plate 1 is V-shaped when viewed from the direction perpendicular to the upper surface 1a, and the V-shaped tip is located in the direction opposite to the traveling direction of the ALC plate 1. And has an air outlet extending along the V-shape. Further, the air knives 3b arranged on both sides of the both side surfaces 1b and 1b are linear, and have an air outlet extending along the straight line, covering the entire side surfaces. That is, the linear air knife 3b has a structure having a length capable of air blowing from the upper end to the lower end of both side surfaces 1b, 1b of the ALC plate 1.

  The air knife 3a is not limited to a V shape, and may be any one that blows air obliquely forward, and may be, for example, an arc shape. High pressure air is supplied from one air blower 4 to each air knife 3a, 3b.

  The positional relationship between the V-shaped air knife 3a installed on the upper surface 1a of the ALC plate 1 and the linear air knife 3b installed on both side surfaces 1b and 1b is shown in FIGS. 3 (a) and 3 (b). As shown, the air outlet of the linear air knife 3b is set back from the air outlet at the tip of the V-shaped air knife 3a on the upper surface 1a in the direction of travel of the ALC plate 1 ((conveying direction by the conveying roller)). This is the first characteristic configuration of the present invention, and its function and effect will be described below.

  Excess paint is applied to the upper surface 1a and both side surfaces 1b and 1b of the ALC plate 1 at the spray coating portion. In particular, the upper surface 1a is coated with a large amount of paint when compared with the side surfaces 1b and 1b. According to the confirmation of the present inventor, as described above, the coating thickness of the upper surface 1a was 150 μm to 200 μm, and the coating thicknesses of the side surfaces 1b and 1b were around 50 μm. When the ALC plate 1 travels in the direction of arrow a, first, the paint applied to the upper surface 1a is blown by the air blown in the direction of the arrow from the V-shaped air knife 3a installed above the upper surface 1a, and the both side surfaces 1b, 1b. It flows down continuously. That is, both side surfaces 1b and 1b of the ALC plate 1 are covered many times by the paint supplied from the upper surface 1a.

  Therefore, the same effect as the multiple application method using the plurality of spray coating parts described in Patent Document 2 can be obtained, and the paint can be applied to both side surfaces 1b and 1b with a sufficient thickness. In the air knife 3a shown in FIG. 3B, the left straight air knife joined at the V-shaped tip protrudes forward from the right straight air knife, but this is caused by the paint remaining on the upper surface 1a. This is to prevent a portion from occurring. Even in such a configuration, sufficient paint can be poured from the upper surface 1a into the left and right side surfaces 1b and 1b, so that there is a substantial problem with the amount of paint applied on both the side surfaces 1b and 1b and the upper surface 1a. There is no difference.

  Further, as shown in FIG. 4, the air knife 3a may blow out air from the V-shaped leading edge. With such a configuration, the paint on the upper surface 1a of the ALC plate 1 can be blown down to both side surfaces 1b and 1b while the paint on the center portion of the upper surface 1a is blown out forward and left and right. Therefore, this is an effective means for reducing the coating film thickness at the center portion of the upper surface 1a of the ALC plate 1.

  Thereafter, as shown in FIGS. 3 (a) and 3 (b), the paint applied to both side surfaces 1b and 1b by air blowing by a linear air knife 3b disposed backward from the tip of the V-shaped air knife 3a. Is pushed into the bubbles on both side surfaces 1b and 1b, and the excessively applied paint is removed.

  In this way, there is a time difference until the paint applied to the upper surface 1a of the ALC plate 1 is blown off on both side surfaces 1b and 1b by air blow by the V-shaped air knife 3a, and the paint on the upper surface 1a is applied to both side surfaces 1b and 1b. Since the air blow is performed on the both side surfaces 1b and 1b by the linear air knife 3b disposed backward from the tip of the V-shaped air knife 3a after pouring, the amount of paint applied on both side surfaces 1b and 1b The coating amount on the upper surface 1a can be made uniform, and a sufficient coating amount necessary for waterproofing can be secured.

  The second characteristic configuration of the present invention is that the direction in which air is blown from the linear air knife 3b toward both side surfaces 1b and 1b of the ALC plate 1 is as shown in FIG. It is obliquely downward with respect to 1a. In other words, the direction in which the air is blown is such that the upper surface 1a of the ALC plate 1 is placed horizontally, and both side surfaces 1b and 1b of the ALC plate 1 extend in a direction perpendicular to the horizontal upper surface 1a. It means that it is obliquely downward with respect to the horizontal.

  In this way, the air of the straight air knife 3b is blown obliquely downward, assuming that this direction is parallel to the upper surface 1a of the ALC plate 1 (perpendicular to both side surfaces 1b and 1b of the ALC plate 1). Alternatively, when the upper side is inclined, the air flow from the V-shaped air knife 3a on the upper surface 1a and the air flow from the linear air knife 3b merge at the upper end portion where the upper surface 1a of the ALC plate 1 and both side surfaces 1b and 1b are in contact. This is because the paint is sprayed and accumulated at the end portion to generate a protrusion, resulting in a poor appearance.

  On the other hand, as in the present invention, the air flow direction from the straight air knife 3b is set obliquely downward with respect to the upper surface 1a of the ALC plate 1, so that the air flows at the upper end of the ALC plate 1. As a result, the paint flows smoothly from the upper surface 1a of the ALC plate 1 to the lower side of both side faces 1b and 1b, thereby suppressing the accumulation of paint and the occurrence of protrusions. Can do.

  Further, the linear air knife 3b is configured to be rotatable about the lower end thereof in parallel with both side surfaces 1b and 1b of the ALC plate 1 as indicated by a double arrow b in FIG. In order to change the angle of the linear air knife 3b in accordance with the surface shape of the ALC plate 1, the conveying speed, etc., so that the amount of paint applied to both side surfaces 1b, 1b is approximately the same as the amount applied to the upper surface 1a. It is. By adopting such a configuration, it was confirmed that the coating film thickness of the coating on the upper surface 1a and the both side surfaces 1b and 1b of the ALC plate 1 can be set to about 100 μm to 150 μm.

  As described above, the present inventor has determined the waterproof performance for the coating film on the upper surface 1a of the ALC plate 1 and the both side surfaces 1b, 1b coated with the same coating film thickness of 100 μm to 150 μm as described above according to JIS A 6909.6. This was confirmed by a test method according to 13. This waterproof performance is measured by the water permeability (cc / day), which is the amount of water passing through the coating film. In this case, the groove portion in which the uneven pattern 2 of the ALC plate 1 is formed has the largest water permeability, but the average value measured at many points is 1.89 (cc / day) on the upper surface 1a, and the right side surface 1b. 1.79 (cc / day) and 1.76 (cc / day) on the left side 1b.

  Thus, it was confirmed that the water permeability of the coating film to the upper surface 1a and the both side surfaces 1b, 1b of the ALC plate 1 according to the present invention is small and has sufficient waterproof performance.

  In the embodiment of the present invention, the ALC plate 1 is often subjected to a coating process after being subjected to the design processing of the concavo-convex pattern 2, but the present invention does not perform the design processing of the concavo-convex pattern 2, but the surface thereof is It can also be applied to three-sided coating of flat ALC plates.

  In addition, in view of the fact that the thick paint on the upper surface is applied to the side surface adjacent to the upper surface, not only when applying the three surfaces as described above, but also when applying only the upper surface and one of the side surfaces. The configuration of the invention can be adopted.

  The present invention is not limited to ALC plates, and can be widely applied to porous materials having irregularities and bubbles on the surface.

1 ALC board
1a Top view
1b side view
2 Uneven pattern 3a V-shaped air knife
3b Straight air knife
4 Air blower

Claims (10)

In the coating method of the porous material having the upper surface and the three surfaces on both sides,
Spraying paint onto the upper surface and both side surfaces of the porous material;
Applying a first air blow to the upper surface for pouring the paint on the upper surface of the porous material onto which the paint has been injected;
Applying a second air blow to the both side surfaces after pouring the paint from the upper surface to the both side surfaces by the first air blow.   2. The method for coating a porous material according to claim 1, wherein the step of applying the second air blow is a step of blowing air toward the both side surfaces obliquely downward with respect to the upper surface. .   2. The method according to claim 1, further comprising a step of forming a concavo-convex pattern on the three surfaces of the upper surface and the both side surfaces of the porous material before the step of spraying the paint onto the upper surface and both side surfaces of the porous material. The method for coating a porous material according to claim 2. In the coating method of the porous material having the upper surface and the three surfaces on both sides,
Spraying paint onto the upper surface and any side surface of the porous material;
Applying a first air blow to the upper surface for pouring the paint on the upper surface of the porous material onto which the paint has been sprayed into any of the side surfaces;
Applying a second air blow to any one of the side surfaces after pouring the paint from the upper surface to the any one of the side surfaces by the first air blow. Method. In a coating device for porous materials having three surfaces on the top and both sides,
A spray coating part for spraying paint onto the upper surface and both side surfaces of the porous material;
A first air blow unit that applies a first air blow to the upper surface in order to flow the paint on the upper surface of the porous material coated in the spray coating unit into the both side surfaces;
A second air blow part for applying a second air blow to the both side surfaces after pouring the paint from the upper surface to the both side surfaces by the first air blow part;
A porous material coating apparatus comprising: a transport device configured to transport the porous material from the spray coating unit to the first and second air blow units.   6. The coating apparatus for a porous material according to claim 5, wherein the second air blow unit is disposed so as to be retracted in a transport direction by the transport device from a tip portion of the first air blow unit.   7. The porous material according to claim 5, wherein the second air blow part is configured to blow air toward the both side surfaces obliquely downward with respect to the upper surface. Painting equipment. The first air blow part has a V-shaped first air knife that is disposed on the upper surface and viewed from a direction perpendicular to the upper surface,
The said 2nd air blow part is arrange | positioned on the said both side surfaces, and has a linear 2nd air knife, The coating apparatus of the porous material in any one of Claim 5 thru | or 7 characterized by the above-mentioned.   The porous material coating apparatus according to claim 8, wherein the second air knife is configured to be rotatable about a lower end thereof. In a coating device for porous materials having three surfaces on the top and both sides,
A spray coating portion for spraying paint onto the upper surface and any side surface of the porous material;
A first air blow unit that applies a first air blow to the upper surface in order to flow the paint on the upper surface of the porous material coated at the spray coating unit into any of the side surfaces;
A second air blow unit that applies a second air blow to any one of the side surfaces after pouring the paint from the upper surface to the one of the side surfaces by the first air blow unit;
A porous material coating apparatus comprising: a transport device configured to transport the porous material from the spray coating unit to the first and second air blow units.

Images