JP4614923B2 - Porous plate coating equipment - Google Patents

Description

  The present invention relates to a coating apparatus for a porous plate having irregularities or bubbles on its surface, and more particularly to a coating apparatus for a porous plate having corner portions.

  2. Description of the Related Art In recent years, an outer wall construction method for attaching an outer wall material produced in a factory or the like to an outer wall portion of a building at a construction site has been widely used. As outer wall materials produced in factories, ALC (Autoclaved Light-weight Concrete) boards, precast concrete boards, hard wood chip cement boards, etc., which are porous boards having many fine bubbles, are known. Among these outer wall materials, in particular, porous plates such as ALC are light and easy to construct, and are therefore used in many outer wall materials.

  In such a production process of the outer wall material, a coating composition, that is, a paint is usually applied to the surface in order to improve its appearance and waterproofness. Known coating methods for applying a paint to the surface of the outer wall material include a brush coating method, a spray coating method, a roll coater, a flow coater, and a dipping method.

  The brush coating method is a method in which the surface of the outer wall material is applied by stroking with a brush to which a paint is applied, and is the most primitive method. This brush coating method is suitable for repairing the coating surface of small-scale production outer wall materials and outer wall materials because the brush is put in the paint reservoir, the paint is attached to the brush, and this brush is applied by stroking the outer wall material surface. However, since it is not suitable for mass production, it is not adopted in the mass production process of outer wall materials.

  On the other hand, the spray coating method is a method in which paint is blown out from the spray nozzle at the tip of the spray, and the sprayed paint is sprayed onto the surface of the outer wall material to paint, and a large amount of outer wall material having irregularities on the surface is applied. It can also be applied to production processes. For this reason, this method is employed in various mass production processes of outer wall materials. This spray coating method is adopted in a mass production process of a porous plate having a large number of fine bubbles.

In addition, as a related technical document, the following patent document 1 is mentioned, for example.
JP 2003-126740 A

  The porous plate used as the outer wall material includes a corner plate installed at a corner of the outer wall in addition to a normal flat plate. As shown in the perspective view of FIG. 4, the porous corner plate 11 has a corner portion 11C and flat portions 11P on both sides along the longitudinal direction of the corner portion 11C. The cross-sectional shape is substantially L-shaped.

  The coating of the porous corner plate 11 has been performed by a manual brush coating method due to its complicated shape, and the working efficiency has been significantly reduced. If the spray coating method is used, the porous corner plate 11 is placed on the coating apparatus with the convex portion of the corner portion 11C facing upward so that the coating efficiency is highest. Then, since the flat surface portion 11P of the porous corner plate 11 becomes an inclined surface, the sprayed paint easily flows downward, and there is a problem that the paint is not sufficiently applied to the surface. According to the inventor's experiment, the amount of paint applied to the porous corner plate 11 when this method is used is approximately 10% of the amount of paint applied to a normal flat plate. Decrease degree.

  When the coating amount of the paint 12 is reduced, the fine bubbles 3 in the porous corner plate 11 become the air bubbles 4 sealed with the paint 12 as shown in FIG. The air bulge 4 is ruptured with the passage of time or the atmospheric pressure, and becomes a pinhole 5 in which a non-coating portion of the paint as shown in FIG. 5B remains. Such a pinhole 5 becomes a big factor which deteriorates the external appearance and waterproofness of the porous corner plate 11.

  Therefore, the present invention provides a coating apparatus that improves the appearance and waterproofness of a porous plate when coating a porous plate having a corner portion.

The present invention is a coating device for a porous plate having a corner portion, and is arranged along the traveling direction, and a conveying device that transports the porous plate along the traveling direction with the convex portion of the corner portion facing upward. A first spray coating unit that pressurizes and sprays the coating material on the surface of the porous plate, and is arranged downstream of the first spray coating unit along the traveling direction, and pressurizes the coating material on the surface of the porous plate. A second spray coating portion to be sprayed, an air blow portion for removing excess paint on the surface of the porous plate by air blowing, a decompression chamber for reducing the air pressure to the surface of the porous plate, and a surface of the porous plate And a pressurizing chamber for pressurizing the air pressure, wherein a spray amount of the paint in the first spray coating portion is smaller than a spray amount of the paint in the second spray coating portion .

  Since the porous plate coating apparatus of the present invention is provided with a plurality of spray coating portions, the coating amount of paint can be increased. Thereby, also in the coating of the porous board which has the corner part which is difficult to paint, the external appearance and waterproofness of the porous board can be improved.

  A coating apparatus according to the present embodiment will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a porous plate coating apparatus according to an embodiment of the present invention. Here, the porous plate to be coated is the porous corner plate 11 having the corner portion 11C shown in FIG. It should be noted that the porous corner plate 11 is not limited to that shown in FIG.

  As shown in FIG. 1, the porous plate coating apparatus 10 includes a control unit 22, a preheating unit 25, and a coating unit 30. The preheating unit 25 has a function of applying preheating of, for example, 40 to 50 ° C. by temperature control of the control unit 22 before the porous corner plate 11 is coated by the coating unit 30. Under the control of the control unit 22, the coating unit 30 coats the surface of the porous corner plate 11 carried from the preheating unit 25 with the waterproof paint 12 (hereinafter abbreviated as “paint 12”). At that time, the porous corner plate 11 is placed on the conveyance rollers 72 and 73 of the conveyance device with the convex portion of the corner portion 11C facing upward, and along the traveling direction a by the rotation of the conveyance rollers 72 and 73. Are sent at a constant speed and sequentially pass through each part described later.

  A sensor 26 that detects the presence or absence of the porous corner plate 11 is provided in the vicinity of the carry-in port of the porous corner plate 11 of the coating unit 30. For example, the sensor 26 irradiates the carry-in path of the porous corner plate 11 with laser light and detects the presence or absence of the porous corner plate 11 based on the presence or absence of the reflected light. When the control unit 22 detects that the porous corner plate 11 has been carried into the coating unit 30 based on the detection result of the sensor 26, each process described later is executed by operating each unit of the coating unit 30. The coating unit 30 is controlled as described above.

  Next, the detail of the coating part 30 is demonstrated. As shown in FIG. 1, the coating unit 30 has a casing 31 that shields an internal coating processing space from an external space. A shutter 41 is provided in the vicinity of the carry-in entrance of the porous corner plate 11 to prevent the paint 12 from leaking out of the housing 31.

  This coating processing space is divided into four processing spaces by partition walls 42, 43 and 44. Of these four processing spaces, the first processing space provided on the carry-in entrance side of the porous corner plate 11 sprays the paint 12 on the surface of the porous corner plate 11 at a high pressure. It is a room.

  The paint spraying chamber is provided with a first spray coating part 32A and a second spray paint part 32B. The first spray coating unit 32A includes a plurality of first spray nozzles 53A that spray the paint 12 pressurized by the pump 51 and supplied from the pipe 52A. The second spray coating unit 32B includes a plurality of second spray nozzles 53B that spray the paint 12 pressurized by the pump 51 and supplied from the pipe 53A.

  These 1st and 2nd spray coating parts 32A and 32B make the characteristic of this invention. Details of the first and second spray coating portions 32A and 32B will be described with reference to the drawings. 2 is a partially enlarged view of the first and second spray coating portions 32A and 32B. FIG. 2A is a perspective view thereof, and FIG. 2B is a view of the porous corner plate 11 when viewed from the top. It is a top view.

  As shown in FIG. 2A, in the first spray coating portion 32A, a pipe 52A to which the paint 12 is supplied so as to be orthogonal or substantially orthogonal to the traveling direction a of the porous corner plate 11 to be conveyed. Is arranged. The pipe 52 </ b> A is bent in accordance with the shape of the porous corner plate 11. The pipe 52A is provided with a plurality of first injection nozzles 53A for injecting the paint 12. The plurality of first injection nozzles 53A are arranged in a line along the longitudinal direction of the pipe 52A. And the 2nd spray coating part 32B is arrange | positioned in the back | latter stage along the advancing direction a rather than 32A of the 1st spray coating part. In the second spray coating portion 32B, a pipe 52B to which the paint 12 is supplied is disposed so as to be orthogonal or substantially orthogonal to the traveling direction a of the porous corner plate 11 to be conveyed. The pipe 52 </ b> B is bent in accordance with the shape of the porous corner plate 11. The pipe 52B is provided with a plurality of second injection nozzles 53B for injecting the paint 12. The plurality of second injection nozzles 53B are arranged in a line along the longitudinal direction of the pipe 52B. The pipe 52A and the pipe 52B are arranged in parallel or substantially parallel to each other.

  Here, the distance D1 between the first spray coating portion 32A and the second spray coating portion 32B is about 10 cm. Moreover, the separation distance D2 between each of the injection ports of the first injection nozzle 53A and the second injection nozzle 53B and the surface of the porous corner plate 11 is about 7 to 10 cm. In addition, the direction of each injection port of the first injection nozzle 53A and the second injection nozzle 53B is vertical or substantially vertical so that the coating hitting force is as large as possible with respect to the surface of the porous corner plate 11. It has become.

  Further, it is preferable that the amount of the paint 12 sprayed per unit time from the first spray nozzle 53A is smaller than the amount of the paint 12 sprayed per unit time from the second spray nozzle 53B. The amount of the paint 12 sprayed from the first spray nozzle 53A is about 20 liters per minute, and the amount of the paint 12 sprayed from the second spray nozzle 53B is about 80 liters per minute. This is because the coating material 12 is gradually spread inside the numerous fine bubbles on the surface of the porous corner plate 11 to further increase the coating amount of the coating material 12.

At this time, the spraying of the coating material 12 is adjusted by the pump 51 and the hydraulic pressure gauge 54 so that the coating striking force on the surface of the porous corner plate 11 is, for example, 2 g / cm ² or more, preferably 10 g / cm ² or more. It is injected with.

  Moreover, when the spray coating part 32 is seen from the upper surface side, as shown to FIG. 2 (B), it is the advancing direction a with respect to the surface of the porous corner board 11 from the 1st and 2nd spray nozzle 53A, 53B. The coating material 12 is sprayed so as to fill an elliptical region having a major axis in a direction orthogonal to or substantially orthogonal to. The elliptical areas to which the paint 12 is sprayed partially overlap each other so as to eliminate the non-painting areas.

  According to the spraying of the coating material 12 having the two-stage structure by the first and second spray coating portions 32A and 32B, the coating amount of the coating material 12 applied to the porous corner plate 11 including the inside of the bubbles is set in the coating. Compared to the case where the spray coating portion for spraying 12 is only one stage, it is possible to increase the number by at least about 10%.

  Next, with reference to FIG. 1, the air blowing chamber which is the 2nd processing space adjacent to the 1st processing space is demonstrated. The air blowing chamber is provided with an air blow portion 33 that scrapes off excess paint sprayed by the first and second spray coating portions 32A and 32B by air blow. The air blow unit 33 includes an air cutter 65 to which air is supplied from the blower unit 61 through the air distribution chamber 62. The air supplied to the air cutter 65 is blown at a high pressure against the coating film 20 on the porous corner plate 11 through the air blow plates 65A and 65B provided at the tip of the air cutter 65. At the same time, the porous corner plate 11 is sent along the traveling direction a by the rotation of the transport rollers 72 and 73 of the transport device. Thus, the excessive paint 12 in the paint film 20 on the porous corner plate 11 is scraped off and removed by the air from the air cutter 65.

  The removed paint 12 flows down from both ends of the porous corner plate 11 to the collection tank 46. The paint 12 accumulated in the collection tank 46 is sent to the pipe 75 by the pump 74 and supplied to a filter (not shown) provided at the end of the pipe 75. The paint 12 from which impurities have been removed by this filter is returned again to the coating apparatus 10 by the pump 74 and supplied to the first and second spray coating units 32A and 32B.

  Next, the decompression chamber 34 that is a third processing space adjacent to the second processing space will be described. The decompression chamber 34 performs a decompression process on the surface of the coating film 20 of the porous corner plate 11 from which the excess coating material 12 has been removed by the air blowing unit 33. Specifically, for example, air is sucked from the decompression chamber 34 through the pipe 76 by the blower unit 61, so that the interior of the decompression chamber 34 is maintained at a pressure lower than the atmospheric pressure by, for example, about 1.5 KPa or more. Be drunk. Thereby, on the surface of the porous corner plate 11, when the paint 12 does not spread reliably in the bubbles and there is an air reservoir confined in the bubbles by the paint film 20, it can be expanded and ruptured. .

  Next, the pressurizing chamber 35 that is a fourth processing space adjacent to the third processing space will be described. The pressurizing chamber 35 performs a pressurizing process on the surface of the coating film 20 on the porous corner plate 11 in which the air bubbles in the bubbles are ruptured in the decompression chamber 34. Specifically, for example, the paint 12 is pushed into the bubbles by blowing air against the paint film 20 on the porous corner plate 11. The pressurizing chamber 35 is configured such that pressurized air is supplied from the blower unit 61 through the air distribution chamber 62 and the pipe 77. Here, an air flow as indicated by an arrow b in the figure is generated from the pressurizing chamber 35 to the decompression chamber 34 adjacent thereto. Therefore, when the porous corner plate 11 is sent along the traveling direction a so as to go against the air flow, the coating film 20 on the surface is smoothly extended and the coating 12 is more surely introduced into the bubbles. Flows in.

  Next, the process of coating the porous corner plate 11 by the coating apparatus 10 will be described with reference to the drawings. FIG. 3 is a cross-sectional view showing the porous corner plate 11 to be painted by the coating apparatus 10. 3A to 3D correspond to a paint spraying chamber, an air spraying chamber, a decompression chamber, and a pressurizing chamber, respectively.

  First, as shown in FIG. 3A, in the paint spraying chamber, the first and second spray coating portions 32A and 32B are applied to the porous corner plate 11 after preheating is applied by the preheating portion 25. The coating material 12 is sprayed from. At this time, since the first and second spray coating portions 32A and 32B are arranged in two stages at different positions along the traveling direction a, the first and second spray coating portions 32A and 32B are more than in the case where the spray coating portion is one stage. The paint 12 spreads in the bubbles 3. Here, depending on the bubbles, there is a possibility that the air bulge 4 in which a slight amount of air is still trapped by the paint film 20 remains, but the number and scale of the air bulges 4 is the case where the spray coating portion is one stage. It is smaller than Thereafter, the porous corner plate 11 is conveyed to the air blowing chamber.

  Next, as shown in FIG. 3B, in the air blowing chamber, air is blown at a high pressure by the air cutter 65 of the air blowing portion 33 against the coating film 20 made of the coating 12 on the porous corner plate 11. Applied and excess paint 12 is removed. Thereafter, the porous corner plate 11 is conveyed to the decompression chamber.

  Next, as shown in FIG. 3C, in the decompression chamber 34, the slight air masses 4 remaining in the bubbles 3 of the porous corner plate 11 are expanded and ruptured by suction of air through the pipe 76. . The porous corner plate 11 is transferred to the pressurizing chamber 35. Then, as shown in FIG. 3D, in the pressurizing chamber 35, the paint film 20 on the surface of the porous corner plate 11 is pressurized by air blowing, and the paint on the surface of the paint film 20 is applied. 12 is poured into all the wall surfaces in the bubble 3, and the coating film 20 is smoothly extended.

  Thus, the coating film 20 to which the coating material 12 has been applied to the entire inside of the bubbles 3, that is, the coating film 20 having no non-coating portion is formed on the surface of the porous corner plate 11. As a result, the appearance and waterproofness of the porous corner plate 11 can be improved.

  In the above embodiment, the coating unit 30 is provided with the first and second spray coating units 32A and 32B at two different positions along the traveling direction a of the porous corner plate 11, respectively. The invention is not limited to this. That is, although not shown, in the present invention, the coating portion 30 is similar to the first and second spray coating portions 32A and 32B at three or more different positions along the traveling direction a of the porous corner plate 11. A spray coating portion may be provided.

  Moreover, although the porous corner board 11 which is a coating object of the coating apparatus 10 of the said embodiment shall consist of an ALC board, this invention is not limited to this. That is, the present invention can be applied to porous plates or outer wall materials other than those described above as long as they have the same or similar shape as the porous corner plate 11 and at least the surface has bubbles or irregularities. The

It is a schematic block diagram which shows the coating apparatus of the porous board which concerns on embodiment of this invention. It is the elements on larger scale of the 1st and 2nd spray coating part of FIG. It is sectional drawing which shows the porous corner board coated with the coating apparatus of the porous board which concerns on embodiment of this invention. It is a perspective view which shows a porous corner board. It is sectional drawing which shows the porous corner board painted by the coating method which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Coating apparatus 11 Porous corner board 12 Paint 20 Paint film 30 Coating part 31 Housing | casing 32A 1st spray coating part 32B 2nd spray coating part 33 Air blow part 34 Decompression chamber 35 Pressurization chamber 41 Shutter 42,43, 44 Partitions 51, 74 Pumps 52A, 52B, 75, 76, 77 Pipe 53A First injection nozzle 53B Second injection nozzle 61 Blower section 62 Air distribution chamber 65 Air cutter 72, 73 Conveying roller

Claims (2)

A coating device for a porous plate having a corner,
A transport device for transporting the porous plate along the traveling direction with the convex portion of the corner portion facing upward;
A first spray coating unit that is disposed along the traveling direction and pressurizes and sprays a coating on the surface of the porous plate;
A second spray-coating part that is disposed downstream of the first spray-coating part along the traveling direction, and pressurizes and sprays the paint on the surface of the porous plate;
An air blow unit for removing excess paint on the surface of the porous plate by air blowing;
A decompression chamber for depressurizing air pressure to the surface of the porous plate;
A pressurizing chamber for pressurizing an air pressure against the surface of the porous plate ,
A coating apparatus for a porous plate , wherein the amount of paint sprayed on the first spray coating portion is smaller than the amount of paint sprayed on the second spray coating portion .   The first spray coating portion and the second spray coating portion have a plurality of spray nozzles that pressurize and spray paint on the surface of the porous plate, and the direction of each spray nozzle is the surface of the porous plate 2. A coating apparatus for a porous plate according to claim 1, wherein the coating apparatus is substantially perpendicular to the substrate.

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