JP2000070835A - Coating of alc corner panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously coat the surfaces of both planar parts of an ALC corner panel with a coating material in relatively reduced use quantity by perfectly filling micropores present in both planar parts and grooved decorative joints of the ALC corner panel. SOLUTION: Aq. coating material with a dry solid content of 40 wt.% or more is used as a coating material to be applied in a coating amt. of 0.7-1.5 kg/m2 and a plurality of air nozzles 20, 21 are parallelly provided in the advance direction of a panel 10 and inclined so as not to become parallel to the direction of a grooved decorative joint 14 and arranged so as to arrange slit like blowoff orifices toward the both flat surface parts 12 of the panel 10. By this constitution, air can be almost equally sprayed on the surfaces of both planar surface parts 12 of the panel 10 and the interiors of the grooved decorative joints 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for manufacturing a semiconductor device, comprising: a cross section having flat portions on both sides of a corner portion having a substantially L-shaped cross section;
It relates to an efficient method of painting ALC corner panels applied to the exterior walls of buildings, etc.
The paint can be sufficiently filled up to the surfaces of both flat portions of the ALC corner panel and the inside of the micropores existing in the grooved joints, and a uniform coating surface can be formed as a whole, and both flat surfaces of the ALC corner panel can be formed. The present invention relates to a coating method capable of simultaneously coating a part surface with a relatively small amount of paint.

[0002]

2. Description of the Related Art Since ALC panels (lightweight cellular concrete wall panels) are more porous than concrete,
It is excellent in light weight and heat insulating property, and is widely used as a building material, for example, a building material for an outer wall, a veranda, a parapet structure, etc. by utilizing these characteristics.

[0003] As a surface coating method of the ALC panel, a spray coating method using a spray gun or a conventional method has been known.
Ironing methods using rollers, brushes, etc., have been used, but these methods require repetitive painting by humans in order to fill the micropores in the surface layer of the ALC panel with paint. However, the method is rather inefficient and uneconomical due to the fact that not only is it troublesome, but also the amount of paint used increases.

[0004] As a method of coating an ALC panel in which these problems have been improved, an electrostatic coating method is known (Japanese Patent Laid-Open No. Hei 4 (1994)).
-300267). However, while this electrostatic coating method has been quite effective in eliminating micropores that are open on the surface of the panel, it actually uses a considerable amount of paint to completely eliminate the micropores. Had to do with the problem.

The applicant of the present invention applied a coating method using a spray gun and an air nozzle, which is applied to general panel coating, to the surface coating of an ALC panel having micropores. It has been found that micropores can be filled even by making the amount relatively small, and this method has been previously proposed (Japanese Patent Application Laid-Open No. 7-195027).

However, as a result of continuing further detailed studies thereafter, it has been found that the above-mentioned method proposed by the present applicant has the following problems, especially when painting ALC corner panels.

That is, the ALC corner panel has a substantially L-shaped cross section having flat portions on both sides of the corner portion, and is applied to an outer wall of a building or a corner portion of a veranda structure. When the ALC corner panel is painted by using the above-mentioned spray gun and air nozzle, even if the air nozzle is bent along the corner of the panel and air is blown from the air nozzle to both plane portions of the panel. In particular, air is blown onto the corners of the panel in an overlapping manner from both directions, and the air pressure is weakened. As a result, the air pressure becomes uneven, so that the paint thickness around the corners of the panel becomes uneven. In addition, when both flat portions of the panel are inclined, when the air pressure around the corner portion becomes low, the paint remaining (accumulated) at the upper portion around the corner flows down and becomes fascia-like. For this reason, it was not possible to form a painted surface having a uniform thickness as a whole.

[0008] In addition, especially when grooved joints are formed on both plane portions of the ALC corner panel,
Since it is difficult to completely fill the micropores existing on the side walls and bottom of the grooved joint with the paint, and the paint tends to flow down from above to below the grooved joint, the inside of the grooved joint is reduced. The thickness of the coating film was not uniform, and only a coating film having an inferior appearance could be formed.

Therefore, in order to form a uniform painted surface on both flat portions of such an ALC corner panel, first, one flat portion of the panel is masked, and the other flat portion of the horizontal panel is masked. After coating and spraying air, the coated surface is dried and then the coated surface is masked, and the masking of the one flat portion is further removed, and then the coated surface is masked and the one flat surface is masked. Since this requires a lot of labor and steps of leveling the part and re-painting and spraying air on this surface, there is a problem that it is inefficient, productivity is low, and manufacturing cost is high. It is.

[0010]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying to solve the problems in the prior art described above. Therefore, the object of the present invention is to
Efficient painting method of ALC corner panel, AL
The paint is sufficiently filled up to the inside of the micropores existing in the surfaces of both flat portions of the C corner panel and the grooved joint,
Another object of the present invention is to provide a coating method capable of forming a uniform coating surface as a whole and simultaneously coating both flat surfaces of the ALC corner panel with a relatively small amount of coating material.

[0011]

In order to achieve the above object, a method for coating an ALC corner panel according to the present invention is characterized in that a cross section having flat portions on both sides of the corner portion has a substantially L-shaped shape, After applying a paint to the surfaces of the two flat portions of the ALC corner panel having the grooved joints formed in the two flat portions, before the paint is cured, air is supplied from an air nozzle having a slit-shaped outlet. In the method for painting an ALC corner panel, which is finished by spraying, an aqueous paint having a dry solid content of 40% by weight or more is used as the paint, and the paint is applied in an amount of 0.7 to 1.5 kg / m ^2. At the same time as applying, the plurality of air nozzles are displaced in a direction parallel to the corresponding plane portion and back and forth with respect to the traveling direction of the ALC corner panel. It is inclined so as not to, the A
By arranging the slit-shaped outlets on the surfaces of both flat portions of the LC corner panel, air is blown substantially evenly to the surfaces of both flat portions of the ALC corner panel and the interior of the grooved joint. It is characterized by the following.

In the method of coating an ALC corner panel according to the present invention, the plurality of air nozzles are arranged so that air blown from each slit-shaped outlet does not overlap with each other in the front-back direction of the ALC corner panel. 30
mm or more, and the plurality of air nozzles are inclined by 30 to 80 degrees in a direction of receding from the corner to the side with respect to the traveling direction of the ALC corner panel. And the discharge angles of the air from the plurality of air nozzles were set to AL
The angle of attack with the panel surface in the traveling direction of the C corner panel was in the range of 60 to 90 °, and the length of the slit-shaped air outlet of each air nozzle was greater than the width of the surface of each flat part of the ALC corner panel. Is also long, and A
Blowing air from a plurality of air nozzles onto both flat surface portions of the ALC corner panel while horizontally moving the LC corner panel with its corner portion upward is a preferable condition, and these conditions are applied. By doing so, it is possible to expect to obtain a better effect.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of a method for coating an ALC corner panel according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic perspective explanatory view showing one embodiment of a method for coating an ALC corner panel of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a side view, and FIG. 5 is a side view taken along the line AA of FIG. 4 and shows the air discharge angle with respect to the panel surface. In the embodiment shown in FIGS. 1 to 5, the ALC corner panel 10 has a substantially L-shaped cross section having flat portions 12 and 13 on both sides of a corner portion 11 bent at right angles. Both flat parts 1
A groove-shaped decorative joint 14 extending in a direction orthogonal to the corner portion 11 is formed in each of the second and third corners.

The top of the corner portion 11 and the lower ends of the flat portions 12 and 13 are chamfered by 1-2 cm. And this ALC corner panel 10
Are placed on a belt conveyor (not shown) and transported in the direction of the arrow.

In FIGS. 1 to 5, the AL shown in FIG.
An undercoat is already applied to the surfaces of both flat portions 12 and 13 of the C-corner panel 10 and the interior of the grooved joints 14, and an air nozzle having a slit-shaped outlet before the undercoat is cured. 3 shows a process of finishing by blowing air.

The undercoat paint used herein means a water-based paint having a dry solid content of 40% by weight or more, preferably 50% by weight or more. Water-based paints are acrylic resins,
An aqueous emulsion paint in which resin components such as an epoxy resin, a styrene resin and a urethane resin are dispersed in water using an appropriate dispersant. The undercoat paint has an application amount of 0.7 to 1.5 kg / m ² , Preferably 0.8 to 1.1
It is applied so as to be in the range of Kg / m ² .

If the undercoat paint has a dry solid content of less than 40% by weight, even if the paint is filled into the micropores on the panel surface, it shrinks after drying of the paint and causes It is not preferable because a continuous coating film may not be formed.

The amount of the undercoat paint applied is 0.7 kg / g.
If it is less than m ² , the applied amount is too small to easily form a portion where the paint is not adhered, and if it exceeds 1.5 kg / m ² , it is excluded as excess paint when air is blown in a later step. In either case, the coating amount tends to increase, and the coating efficiency tends to decrease.

The undercoat is applied to both planes of the ALC corner panel by a known method such as spraying, brushing, curtain flow coating, roller coating, etc. In that a uniform coating film can be formed in the grooved joint 14,
Most efficient.

In the air blowing step, the plurality of air nozzles are displaced in a direction parallel to the corresponding plane portions and back and forth with respect to the traveling direction of the ALC corner panel, and are not parallel to the direction of the grooved joint. So that the AL
By arranging the slit-shaped outlets on the surfaces of both flat portions of the C corner panel, the air is blown substantially evenly to the surfaces of both flat portions of the ALC corner panel and the interior of the grooved joint. .

That is, in the illustrated embodiment, one first air nozzle 20 and one second air nozzle 21 are respectively disposed on each of the flat portions 12 and 13 of the ALC corner panel 10. 20,
Reference numeral 21 is disposed so as to be displaced back and forth with respect to the traveling direction of the ALC corner panel 10 and not to be parallel to the direction of the grooved joint 14.

Here, each of the air nozzles 20, 21 is AL
30 mm back and forth with respect to the traveling direction of the C corner panel 10
It is important that the air nozzles 20 and 21 are displaced by the above distance, and each of the air nozzles 20 and 21 is composed of one nozzle without being displaced, or when the air nozzles 20 and 21 are disposed close to each other with a displacement distance l of less than 30 mm. Each air nozzle 20,2
The air blown out from the slit-shaped outlet of No. 1 is particularly A
Since the air near the corners 11 of the ALC corner panel 10 overlaps and the air cannot be uniformly blown, the thickness of the paint around the corners 11 of the ALC corner panel 10 becomes non-uniform, and a uniform coating surface is formed as a whole. Can not be done.

Further, each of the air nozzles 20 and 21 has an AL
In each of the flat portions 12, 13 of the C corner panel 10,
It is important that the air nozzles 20 and 21 are arranged in an inclined manner so as not to be parallel to the direction of the grooved joint 14. The paint cannot be uniformly filled into the inside of the micropores existing on the side walls and the bottom in the grooved joint 14.

As shown in FIG. 2, each of the air nozzles 20 and 21 has an inclination angle α with respect to the traveling direction of the ALC corner panel 10 of 30 to 80 in a direction of receding from the corner portion 11 to the side. °, preferably 4
It is desirable to arrange it so that it may become 0-75 degrees.

As described above, by arranging the air nozzles 20 and 21 at an angle, the ALC corner panel 1 is formed.
The undercoat paint which is going to flow down from the upper surface to the lower surface of each of the flat portions 12 and 13 and the inside of the grooved joint 14 is
Since it can be pushed upward by air, the thickness of the formed coating film can be made uniform.

However, when the inclination angle α is less than 30 °, the paint flows too much downward to form a thin film. On the other hand, 80 °
When the air pressure exceeds, the paint rebounds more strongly when the air hits the joint, and the paint particles fall on the uniformly applied surface to form an uneven film. Further, it is not preferable because the paint is pushed upward by air to move the paint to the other surface to make the thickness of the coating film non-uniform.

Further, as shown in FIG. 5, the discharge angle of the air from each of the air nozzles 20 and 21 is 60 to 90 as an angle of attack (β) with respect to the panel surface in the traveling direction of the ALC corner panel 10. °, preferably 70-80 °
Is desirably within the range. In this manner, by selecting the discharge angle (β) of the air from each of the air nozzles 20 and 21, the paint is tightly filled into the inside of the micropores existing on the surface of the ALC corner panel 10 and inside the grooved joint 14. It is possible to do. However, if the discharge angle β is less than 60 °, the paint moves more and becomes thinner, and if it exceeds 90 °, the air pressure becomes weaker and the filling of the micropores becomes weaker, which is not preferable.

The slit-shaped air outlets of the air nozzles 20 and 21 are linear, and it is important that the length thereof is longer than the width of each of the flat portions 12 and 13 of the ALC corner panel 10. Slit air outlet length is AL
If the width is shorter than the width of each of the flat portions 12 and 13 of the C corner panel 10, a portion where air does not hit each of the flat portions 12 and 13 is generated, and a uniform coating film cannot be formed.

The distance between the surface of each of the flat portions 12 and 13 of the ALC corner panel 10 and each of the slit-shaped air outlets of each of the air nozzles 20 and 21 in the above air blowing step is about 5 to 30 mm. Each air nozzle 20,
It is desirable that the pressure of the air blown out from 21 is 30 m / s or more.

In the above air blowing step, the ALC corner panel 10 is placed on a belt conveyor or the like (not shown) with the corner portion 11 upward, and is horizontally moved while the ALC corner panel 10 is fixed. ALC
It is desirable to blow air on the surfaces of both flat portions 12 and 13 of the corner panel 10.
Of course, it is also possible to blow air while fixing the 0 and horizontally moving the air nozzles 20, 21. In this air blowing step, a scraping device such as a scraper is disposed on the side surface of the ALC corner panel 10 that moves horizontally, and other undercoat paints flowing down the ALC corner panel 10 are removed. Means can be added.

Further, after passing through the above air blowing step,
On the surface of the dried undercoat, as a top coat, it is possible to form a coating film composed of an organic paint or an inorganic paint mainly containing acrylic resin, urethane resin, silicone resin, acrylic silicone resin, fluororesin, etc.
Due to the surface uniformity of the cured undercoat paint film, uniformity of these top coat films can also be expected.

Thus, according to the method for coating an ALC corner panel of the present invention, the micropores existing on the surfaces of both flat surfaces of the ALC corner panel and the interior of the grooved joint are completely filled and uniformly uniform. The painting surface can be formed, and the surface of both flat parts of the ALC corner panel can be painted simultaneously and with a relatively small amount of paint. This makes the painting process more efficient and lower cost than before. Can be planned.

In the present invention, the present invention is not limited to the undercoat paint, and the present invention can be applied to a case where the overcoat is applied over the undercoat, or a case where the panel is directly applied only once. Furthermore, the shape of the grooved joints formed on the panel surface is not particularly limited, and various shapes such as a V-shape, a trapezoidal shape, and a U-shape are applied.

[0035]

The structure and effects of the present invention will be further described below with reference to examples. [Example 1] ALC corner panel (width of plane portion: 20)
mm, groove width in the direction perpendicular to the corners on both planes: 2
0 mm, groove depth: 10 mm, with V-shaped grooved joints having a cross section in parallel at 100 mm intervals).
Undercoat paint (Kikusuikagakukogyo Co., trademark "Kikusui van", a resin solid content of about 50 wt%) was applied in a thickness of 1.2 Kg / m ² by spray coating.

Before the undercoat paint hardens and loses its fluidity, the following conditions are applied to an ALC corner panel which is placed on a belt conveyor with its corners facing upward and moves horizontally at a speed of 2.5 m / min. Air with an air blowing pressure of 600 m / s was blown from two air nozzles provided and displaced 50 mm back and forth. <Conditions of air nozzle> Length of slit-shaped outlet: 200 mm Distance between slit-shaped outlet and panel surface: 40 mm Inclination angle α: 70 ° Discharge angle β: 70 °

In the resulting ALC corner panel, the paint is completely filled into the micropores existing in both flat portions and in the grooved joints, and the overall thickness is uniform at about 1.0 kg / m ^2. An undercoat paint film was formed.

Comparative Example 1 The same conditions as in Example 1 were used except that the phase distance between the two air nozzles was zero, that is, the tips of the two air nozzles were butted over the corners of the ALC corner panel. , ALC corner panels were painted on both flat surfaces and sprayed with air.

[0039] The thickness of the coating film around both corners of the ALC corner panel obtained as a result was about 1.4 kg.
/ M ² , the thickness of the coating film in other parts is about 1.0 kg / m ²
And the thickness of the coating film varied, and only a non-uniform undercoat paint film could be formed.

Comparative Example 2 An ALC corner was prepared under the same conditions as in Example 1 except that a paint (trade name: Nippe Uni, dry solid content: about 35%) manufactured by Nippon Paint Co., Ltd. was used as the undercoat paint. Both flat surfaces of the panel were painted and sprayed with air. As a result, the obtained ALC
Both flat portions of the corner panel have a small amount of dry solid content of the paint, so the paint film after drying has a lot of “wash”, and the paint contained in the micropores present on the surface of the ALC corner panel loses the paint, The appearance of pinholes increased in appearance. Furthermore, micropores of a substantially discontinuous membrane were also generated, and in addition to the appearance, problems such as a decrease in waterproofness occurred.

[Comparative Example 3] In Example 1, the amounts of the undercoat paints applied were 0.4 kg / m ² and 1.7 kg / m ^2.
The coating and air spraying were performed on both plane portions of the ALC corner panel under the same conditions as in Example 1 except that the above conditions were satisfied. As a result, when both sides of the obtained ALC corner panel have a coating amount of 0.4 kg / m ² , the coating amount is too small. In the case of 1.7 kg / m ² , there is a problem that excess paint becomes too large and coating efficiency becomes poor.

[Comparative Example 4] In the same manner as in Example 1, except that the plurality of air nozzles were not parallel to the plane portion of the ALC corner panel, the portion where the air nozzle was far from the panel surface was the same. The air was weak, the coating film became thick, and the thickness of the coating film became uneven.

Comparative Example 5 The procedure of Example 1 was repeated, except that a plurality of air nozzles were installed so as to be parallel to the plane portion with respect to the direction of the grooved joint formed in the surface of the ALC corner panel. Under the same conditions as in Example 1, painting and air spraying were performed on both flat portions of the ALC corner panel.
Both plane portions of the resulting ALC corner panel are:
When the paint is moved by air blowing, many paints accumulated in the groove will be pushed up to the convex surface at once, and the paint will jump up due to the pressure of the air and fall on the evenly painted flat part The problem that an uneven pattern was formed occurred. In addition, paint splashes, causing paint to adhere to the slits of the air outlets of the air nozzles.The air pressure is weakened in the areas where the paint adheres, and the paint film becomes thicker. The remaining problem occurred.

[0044]

As described above, according to the method for coating an ALC corner panel of the present invention, the micropores existing in the surfaces of both flat portions of the ALC corner panel and in the grooved joint are completely filled and uniformly filled. Because it is possible to form a smooth painted surface and to paint both flat surfaces of the ALC corner panel at the same time and with a relatively small amount of paint, the painting process is more efficient and costs less than before. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic perspective explanatory view showing one embodiment of a method for coating an ALC corner panel of the present invention.

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

FIG. 3 is a side view of the same.

FIG. 4 is a front view of the same.

FIG. 5 is a side view taken along line AA of FIG. 4 and shows an air discharge angle with respect to the panel surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ALC corner panel 11 Corner part 12 Flat part 13 Flat part 14 Groove-shaped cosmetic joint 20 Air nozzle 21 Air nozzle

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Sato 2035 Shimoi, Shioimachi, Owariasahi City, Aichi Prefecture Onoda FLC Co., Ltd. F term (reference) 4D075 BB57Z CA48 DA06 DB12 DC03 EA06

Claims (6)

[Claims] 1. An ALC corner panel in which a cross section having flat portions on both sides of a corner portion has a substantially L-shaped cross-section and a groove-like decorative joint is formed in both flat portions. After applying the paint on the surface and before the paint cures,
A coating method for an ALC corner panel, which comprises finishing by blowing air from an air nozzle having a slit-shaped outlet, wherein an aqueous paint having a dry solid content of 40% by weight or more is used as the paint, and the paint is 0.7 to 1.5 kg. / M ² , and a plurality of air nozzles are displaced in a direction parallel to a corresponding plane portion and back and forth with respect to a traveling direction of the ALC corner panel, and further, in a direction of the groove-shaped decorative joint. By arranging the slit-shaped outlets facing both surfaces of the ALC corner panel so as not to be parallel to the inner surface of the ALC corner panel and the inside of the grooved joint. A method of coating an ALC corner panel, wherein air is blown substantially evenly to the ALC corner panel. 2. A plurality of air nozzles are provided so that air blown out from each slit-shaped outlet does not overlap.
The method for coating an ALC corner panel according to claim 1, wherein the ALC corner panel is disposed so as to be displaced by a distance of 30 mm or more forward and backward with respect to the traveling direction of the LC corner panel. 3. The air nozzle according to claim 1, wherein the plurality of air nozzles are arranged at an angle of 30 to 80 degrees with respect to the traveling direction of the ALC corner panel in a direction of receding from the corner to the side. A according to 1 or 2
How to paint LC corner panels. 4. An air discharge angle of each of the plurality of air nozzles is set to an angle of attack with respect to a panel surface in a traveling direction of an ALC corner panel in a range of 60 to 90 °. 4. The method for coating an ALC corner panel according to any one of items 3 to 3. 5. The air nozzle according to claim 1, wherein the length of the slit-shaped air outlet of each of the air nozzles is longer than the width of the surface of each flat portion of the ALC corner panel.
A method for painting an ALC corner panel according to the item. 6. The method according to claim 1, wherein air is blown from a plurality of air nozzles to the surfaces of both flat portions of the ALC corner panel while horizontally moving the ALC corner panel with its corner portion upward. The method for coating an ALC corner panel according to any one of the preceding claims.