JP3798288B2 - Building material spray coating equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The invention of this application relates to a building material spray coating apparatus. More specifically, the invention of this application relates to a new building material spray coating apparatus capable of spray coating a board-shaped building material.
[0002]
[Prior art]
The applicant of this application has already proposed a building material spray coating method as a technique related to spray coating of board-shaped building materials (Japanese Patent Laid-Open No. 2000-185250). In this building material spray coating method, as illustrated in FIG. 6, a reciprocating spray section (2a) having one or a plurality of spray nozzles (21) that vibrate in a direction B orthogonal to the traveling direction A of the board-shaped building material (1). ) (2b) is arranged opposite to the front and rear with respect to the traveling direction A of the board-shaped building material, and the interval between the reciprocating spray parts (2a) and (2b) and the conveyance speed of the board-shaped building material (1) are mutually adjusted. Then, as illustrated in FIG. 7, the application pattern trajectories (3a) and (3b) of the board-shaped building material (1) by the spray nozzles (21) of the front and rear reciprocating spray sections (2a) and (2b) have a phase difference of 180 °. As a result, the coating material is discharged so that the dispersion of the coating amount can be reduced and the coating loss can be reduced, and the spray coating can be uniformly and uniformly applied regardless of the unevenness of the board-shaped building material (1). It is realized at low cost. Further, according to this coating method, the installation space in the vertical direction of the spray nozzle (21) is greatly reduced as compared with the case where coating is performed by the conventional reciprocating method + air electrostatic method as exemplified in FIG. There is also an advantage of being able to do it.
[0003]
[Problems to be solved by the invention]
However, even with such an excellent building material spray coating method, it has been found that there are practically the following points to be further improved.
[0004]
That is, for example, as illustrated in FIG. 9, when the interval between the spray nozzles (21) in each of the reciprocating spray units (2a) and (2b) illustrated in FIG. 6 is narrow, the spray pattern between the spray nozzles (21). May interfere with each other, making it difficult to obtain a desired spray pattern. Moreover, the adhesion of the scattered paint from each other increases, and there is a possibility that the operation may be hindered for a long time. In order to avoid the interference of the spray pattern and the adhesion of the scattered paint, it is conceivable to widen the distance between the spray nozzles (21) in the lateral direction, but naturally the necessary lateral space is increased, leading to an increase in the size of the entire coating apparatus. End up. It is not preferable in terms of stabilization of the spray pattern and coating efficiency.
[0005]
In particular, when air electrostatic coating is employed, if each spray nozzle (21) is too close, a repulsion voltage may be generated and the spray pattern may become more disturbed.
[0006]
The invention of this application has been made in view of the circumstances as described above, and it is possible to obtain a desired spray pattern with good coating efficiency while improving the prior art and realizing space saving. The goal is to provide a new building material spray coating device that can operate for a long time.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the invention of this application is as follows. First, four stages of reciprocating spray parts S1 to S4 having spray nozzles that vibrate in a direction orthogonal to the traveling direction of the board-shaped building material are It is arranged in the front two stages S1, S2 and the rear two stages S3, S4 with respect to the traveling direction A of the building material. The front two-stage reciprocating spray parts S1, S2 and the rear two-stage reciprocating spray parts S3, S4. Are displaced from each other in a direction orthogonal to the traveling direction of the board-shaped building material, and one of the first two stages S1 or S2 in the front two-stage reciprocating spray sections S1 and S2 and the second two-stage reciprocating spray section S3. , S4, the first coating is performed by one step S3 or S4, and the other one step S2 or S1 and the rear of the reciprocating spray units S1 and S2 of the two steps forward. Second coating by the other one stage S4 or S3 in reciprocating spray unit S3, S4 stage is performed, so that a phase difference of 180 ° to the trajectory of the coating pattern of the first and second coating occurs The present invention provides a building material spray coating apparatus.
[0008]
The invention of this application also secondly provides a building material spray coating apparatus in which the distance between the front two-stage reciprocating spray section and the rear two-stage reciprocating spray section is widened.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The invention of this application has the features as described above, and the embodiments thereof will be described below in more detail with reference to the accompanying drawings.
[0010]
First, for example, in the building material spray coating apparatus of the invention of this application illustrated in FIG. 1, four stages of reciprocating spray parts S1 to S4 are sequentially provided along the traveling direction of the board-shaped building material (1). S1 has spray nozzles A1 and B1, reciprocating spray section S2 has spray nozzles A2 and B2, reciprocating spray section S3 has spray nozzles A3 and B3, and reciprocating spray section S4 has spray nozzles A4 and B4. Each spray nozzle A1-A4. B1 to B4 vibrate in a direction orthogonal to the traveling direction of the board-shaped building material (1). For example, an air electrostatic gun for performing air electrostatic coating can be used. Each spray pattern is elliptical as shown. Further, the front two-stage reciprocating spray sections S1 and S2 and the rear two-stage reciprocating spray sections S3 and S4 are displaced from each other in a direction orthogonal to the traveling direction of the board-shaped building material (1). Then, the spray nozzles A1 and A2, A3 and A4, B1 and B2, and B3 and B4 do not overlap with each other and are separated from each other by a predetermined interval. In addition, the front and back here call the front side which passes first seeing from the board-shaped building material (1) which advances, and the back side which passes back is called back.
[0011]
In this arrangement, one of the first stage S1 or S2 in the front two-stage reciprocating spray sections S1 and S2 and one of the first stage S3 or S4 in the two rear-stage reciprocating spray sections S3 and S4 are used for the first time. The second coating is performed by the other first stage S2 or S1 in the front two-stage reciprocating spray sections S1 and S2 and the other second stage S4 or S3 in the rear two-stage reciprocating spray sections S3 and S4. Done. That is, for example, when A1, B1 of S1 and A3, B3 of S3 are applied for the first time, A2, B2 of S2, and A4, B4 of S4 are applied for the second time, or conversely, A2, B2 and S4 of S2 are applied. A4 and B4 for the first time, A1 and B1 for S1 and A3 and A3 for S3 are applied for the second time, A1 and B1 for S1 and A4 and B4 for S4 are the first time, and A2 and B2 for S2. And A3 and B3 of S3 may perform the second coating. Further, in these two coatings, a phase difference of 180 ° is generated in the locus of the application pattern of the first and second coatings. This application pattern trajectory is the same as the building material spray coating method described in Japanese Patent Laid-Open No. 2000-185250, and will be described with reference to FIG. 7. For example, the application pattern trajectory (3a) is the first coating, application pattern trajectory ( 3b) is due to the second coating.
[0012]
According to the invention of this application as described above, the space in the vertical direction (that is, the traveling direction of the board-shaped building material (1), the same applies hereinafter) is greater than that of the conventional reciprocating method + air electrostatic coating device illustrated in FIG. While maintaining the advantage of being able to be reduced, the nozzle interval in the horizontal direction (that is, the direction orthogonal to the traveling direction of the board-shaped building material (1); hereinafter the same) is the same as in the case of the conventional building material spray coating method illustrated in FIG. Even if it is set, the occurrence of spray pattern interference as exemplified in FIG. 9 can be effectively suppressed, and high coating efficiency can be ensured.
[0013]
In the invention of this application, for example, as illustrated in FIG. 2, it is more preferable to widen the distance between the reciprocating spray sections S1 and S2 in the two front stages and the reciprocating spray sections S3 and S4 in the two rear stages to some extent. preferable. In the arrangement of FIG. 1, the nozzle adhesion of the scattered paint is sufficiently smaller than that in the conventional arrangement of FIG. 6, but if this interval is widened, the scattered paint in the region between the front two stages and the rear two stages is side-mounted. This makes it easy to flow in the direction, prevents accumulation of scattered paint, prevents nozzle adhesion more effectively, and further increases the operating time.
[0014]
【Example】
[Example 1]
FIG. 3 shows an embodiment of a building material spray coating apparatus according to the invention of this application. In one embodiment of FIG. 3, when the coating conditions are set as follows:
Building material transport speed = 40 m / min
Application amount = 0.5 to 0.8 g / scale 2 (solid content)
Paint solid content = 15-20%
Paint discharge rate = 200 to 300 cc / min · Gun vibration = 50 to 150 mm stroke, 1 cycle / 1 sec (vibration possible at 1 cycle / 0.5 to 1.5 sec)
The vertical spacing between the reciprocating spray sections S1 to S4 is 333 mm (about 1000 mm from the reciprocating spray sections S1 to S4), and the front two reciprocating spray sections S1 and S2 and the rear two reciprocating spray sections S3 and S4. The positional deviation is 300 mm.
[0015]
Thus, compared to the case of the conventional building material spray coating method illustrated in FIG. 9 described above, the spray nozzles A1 to B2 in the front two-stage reciprocating spray sections S1 and S2 and the rear two-stage reciprocating spray sections S3 and S4. The horizontal intervals of the spray nozzles A3 to B4 remain 300 mm, and the horizontal intervals of the adjacent spray nozzles A1 to B4 in the same reciprocating spray section S1 to S4 can be secured to 600 mm or more. No interference between spray patterns due to A1 to B4, even if an air electrostatic gun is used, there is no effect of high voltage, and adhesion of scattered paint can be suppressed, and building material spray coating that can be operated for a long time A device is realized. Of course, the vertical space is sufficiently reduced as compared with the conventional reciprocating type + air electrostatic type coating apparatus illustrated in FIG.
[0016]
The numerical values shown in FIG. 8 and FIG. 9 are the same coating conditions as those in FIG.
Building material transport speed = 40 m / min
Application amount = 0.5 to 0.8 g / scale 2 (solid content)
Paint solid content = 15-20%
The amount of paint discharged is 200 to 300 cc / min · gun. In addition, in FIG. 8, the vertical interval of each spray nozzle is 500 mm, the total distance is 4500 to 5500 mm (10 to 12 guns (= spray nozzles)), and each spray nozzle has a stroke of 1200 to 1500 mm. The board-like building material (1) is reciprocated in the direction of the arrow. Moreover, the spray pattern width | variety by each spray nozzle is 300-400 mm, and is unified in FIG.3, FIG.8, FIG.9.
[0017]
Further, the vertical interval X of the spray nozzle is determined by the formula of the vertical interval X = conveying speed / vibration cycle / 2 using the building material conveyance speed and the vibration cycle. For example, the vibration is 1 sec / vibration at 40 m / min conveyance. In cyc, X = 40/60/2 = 0.333 m. By disposing at this interval, a 180 ° phase difference is produced in the first and second coating pattern trajectories, and a uniform coating film without unevenness is obtained.
[0018]
[Example 2]
In the case of the setting as in the first embodiment, depending on various conditions such as the coating environment, for example, as illustrated in FIG. 4, the front two-stage reciprocating spray sections S1 and S2 and the rear two-stage reciprocating spray section S3. There is a possibility that a state where the scattered paint is likely to be trapped may occur in the region between S4 (the region surrounded by a circle in the figure). In this case, as described above, the two-stage reciprocating spray unit S1, S2 What is necessary is just to widen the space | interval of S2 and reciprocating spray part S3, S4 of 2 steps | paragraphs back to some extent.
[0019]
FIG. 5 shows an embodiment thereof, in which the distance between the front two stages and the rear two stages is increased from 333 mm to double 666 mm. As a result, the scattered paint in the region flows in the side direction without being confined, the influence of the scattered paint on the nozzle is suppressed, and a longer operating time is realized.
[0020]
When actually measured, the operating time was extended approximately twice that of FIG. In this measurement, the spray nozzles A1 and B1 of the reciprocating spray section S1 and the spray nozzles A4 and B4 of the reciprocating spray section S4 are the first time, the spray nozzles A2 and B2 of the reciprocating spray section S2, and the spray nozzles A3 and B3 of the reciprocating spray section S3. The painting order is the second painting.
[0021]
Of course, even if the interval is widened in this way, a uniform coating film without unevenness can be maintained by the coating pattern locus having a phase difference of 180 ° regardless of the unevenness of the board-shaped building material (1). The vertical space remains much less than in FIG.
[0022]
The present invention is not limited to the above examples, and it goes without saying that various modes are possible for details.
[0023]
【The invention's effect】
The invention of this application described in detail above provides a new building material spray coating apparatus capable of operating for a long period of time, capable of obtaining a desired spray pattern with good coating efficiency while realizing space saving.
[Brief description of the drawings]
FIG. 1 is a plan view schematically illustrating the positional relationship between a reciprocating spray section and a board-shaped building material in a building material spray coating apparatus of the invention of this application.
FIG. 2 is a plan view schematically illustrating still another positional relationship between a reciprocating spray section and a board-shaped building material in the building material spray coating apparatus of the invention of this application.
FIG. 3 is a plan view schematically showing one embodiment of a building material spray coating apparatus of the invention of this application.
FIG. 4 is a plan view schematically showing one embodiment of a building material spray coating apparatus of the invention of this application.
FIG. 5 is a plan view schematically showing still another embodiment of the building material spray coating apparatus of the invention of this application.
FIG. 6 is a plan view illustrating the positional relationship between a reciprocating spray section and a board-shaped building material in a conventional building material spray coating method.
FIG. 7 is a conceptual diagram showing an example of a 180-degree phase difference of a coating pattern locus.
FIG. 8 is a schematic diagram for explaining a conventional reciprocating method + electrostatic method coating.
FIG. 9 is a schematic diagram for explaining a spray pattern in the conventional building material spray coating method illustrated in FIG. 6;
[Explanation of symbols]
S1, S2, S3, S4 Reciprocating spray part A1, A2, A3, A4 Spray nozzle B1, B2, B3, B4 Spray nozzle 1 Board-like building material 2a, 2b Reciprocating spray part 21 Spray nozzle 3a, 3b Coating pattern locus A Board-like Building material travel direction B Spray nozzle vibration direction

Claims (2)

Four stages of reciprocating spray parts S1 to S4 having spray nozzles that vibrate in a direction orthogonal to the traveling direction of the board-shaped building material are two forward stages S1, S2 and two backward stages S3 with respect to the traveling direction A of the board-shaped building material. , S4,
The front two-stage reciprocating spray sections S1, S2 and the rear two-stage reciprocating spray sections S3, S4 are misaligned with each other in the direction perpendicular to the traveling direction of the board-shaped building material.
The first coating is performed by either one step S1 or S2 in the front two-stage reciprocating spray section S1, S2 and one step S3 or S4 in the two rear-stage reciprocating spray sections S3, S4. The second coating is performed by the other first stage S2 or S1 in the front two-stage reciprocating spray sections S1 and S2 and the other first stage S4 or S3 in the second two-stage reciprocating spray sections S3 and S4,
A building material spray coating apparatus characterized in that a phase difference of 180 ° is generated in the locus of the coating pattern of the first and second coatings. The building material spray coating apparatus according to claim 1, wherein a distance between the front two-stage reciprocating spray section and the rear two-stage reciprocating spray section is widened.

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