JP5018825B2 - Rotary spray painting method - Google Patents

Description

  The present invention relates to a spray coating method, and more particularly to a coating method for continuously coating an article such as a building material that is placed on a conveyor and moves using a rotary spray.

  Conventionally, as one of the means for continuously painting articles such as building articles placed on a conveyor, a spray that rotates a rotor (rotary body) in which a plurality of spray nozzles are arranged and rotates around a rotating track surface. There is known a rotary spray coating method in which paint is sprayed from a nozzle.

  FIG. 3 of the present application is a perspective view showing a schematic configuration of a rotary coating machine 2 constituting the main part of the known rotary spray coating apparatus. FIG. 4A is a plan view schematically showing the rotary spray coating apparatus.

  As shown in FIG. 3 and FIG. 4A of the present application, in the rotary spray coating apparatus, the rotary coating machine 2 normally has the object 5 to be coated in a state where the object 5 is placed on the conveyor 4. The rotor 21 having a diameter larger than the width is provided on the same rotating raceway surface, and a plurality of spray nozzles 3 are arranged at equal intervals, for example, 60 ° pitch, for coating. In addition, illustration of the said rotor 21 is abbreviate | omitted in this application Fig.4 (a).

  Japanese Patent Application Laid-Open No. 2000-061364 discloses a rotary spray coating apparatus capable of performing spray coating with a predetermined coating amount while suppressing uneven coating and reducing scattering loss of the coating material.

  That is, in the above publication, a plurality of spray nozzles are arranged on each of a plurality of circumferential tracks with respect to the rotation center of the rotor, and the rotation track surface is sprayed onto the conveyor by spraying paint from the spray nozzles parallel to the conveyor surface. A rotary spray coating apparatus for coating a mounted article, wherein a paint supply system to spray nozzles on each circumferential track is a separate system and is separately hydraulically controlled. A rotary spray coating apparatus is disclosed.

  And, the effect is stated that the paint loss that is scattered outside the width of the conveyor, that is, outside the surface of the article to be coated, can be reduced and the maximum circumference of the spray nozzle can be accommodated within the width of the conveyor. . In addition, since the circumferential orbit diameter of the spray nozzle by the rotor can be reduced and the peripheral speed can be suppressed, it is possible to reduce the paint loss that scatters in the form of a mist. It is said that it is extremely effective when using.

  However, the technique described in the above publication has a problem that the spray pressure of the paint in the spray nozzle needs to be controlled by another system, so that the system becomes complicated and an expensive control mechanism has to be introduced.

JP 2000-061364 A

  By the way, when an object placed on a conveyor, particularly a rectangular object such as a building board material, is coated using the rotary spray coating machine, it is sprayed on the left and right ends of the object in the width direction. There has been empirically known a problem that a coating thickness is reduced and a predetermined film thickness cannot be obtained.

  That is, as shown in FIG. 4 (b), the position of the spray nozzle 3 that goes around the circumference track close to the object to be coated 5 as shown by → (the left side of FIG. 4 (b)) and the object to be covered. There is a problem that the coating amount of the paint 6 is reduced at a position away from the top of the coated object 5 as shown by → (right side of FIG. 4B).

  4C of this application is explanatory drawing which shows typically the film thickness in the right-and-left both ends of the to-be-coated object 5 at this time. That is, as shown in FIG. 4C, since a predetermined amount of paint is not applied to both ends of the object 5 to be coated, the required film thickness indicated by the dotted line in FIG. Without being obtained, it is applied thinner by Δd than the predetermined film thickness. Therefore, there is a problem in that excellent coating quality cannot be obtained because uneven coating occurs at both ends along the length direction.

  The present invention has been made in view of the above-mentioned background art, and its purpose is to use a rotary spray coating apparatus when coating an object to be coated such as a building board that is placed on a conveyor and moves. It is an object of the present invention to provide an excellent coating method capable of obtaining a coated product in which the left and right end portions in the width direction can be applied to a predetermined film thickness and the entire surface is uniformly applied.

  In order to solve the above-described problem, the rotary spray coating method according to the first aspect of the present invention is placed on a conveyor by spraying paint from a spray nozzle whose rotating raceway surface is arranged parallel to the conveyor surface. A method of coating an object to be coated, wherein the spray nozzle arranged on the rotating raceway surface is at a position close to the upper part of the object to be coated and a position away from the upper part of the object to be coated. Is a rotary spray coating method in which paint scattering prevention plates are provided in proximity to the object to be coated on both sides.

  Further, in the invention according to claim 2 of the present application, in the rotary spray coating method according to claim 1, the outer end portion of the paint scattering prevention plate provided close to both sides of the object to be coated on the conveyor is raised. The paint scattering prevention plate is inclined.

  In the rotary spray coating method according to the first aspect of the present invention, the spray nozzle disposed on the rotating raceway surface is located at a position close to the top of the object to be coated and a position away from the top of the object to be coated. Since the paint scattering prevention plates are provided on both sides of the object to be painted on the conveyor and in close proximity to the object to be painted, the left and right ends of the object to be painted are covered with the surface of the object to be painted due to the presence of the paint scattering prevention plates. The coating conditions are almost the same as other parts.

  And since the coating material from a spray nozzle is sprayed on the left-right edge part of a to-be-coated object and a coating-material scattering prevention board on the same conditions, and it apply | coats uniformly, it can obtain the outstanding coating film without application | coating unevenness.

  Further, in the invention according to claim 2 of the present application, in the rotary spray coating method according to claim 1, the outer end portion of the paint scattering prevention plate provided close to both sides of the object to be coated on the conveyor is raised. By tilting the paint scattering prevention plate, it is possible to more efficiently prevent spraying of the sprayed paint, so that the consumption of paint can be reduced and the manufacturing cost can be improved, and there is no uneven coating. An architectural board material having an excellent coating film can be provided.

(A) is a top view which shows typically the rotary spray coating apparatus which concerns on the method of this invention, (b) is a front view which shows typically the rotary spray coating apparatus which concerns on the method of this invention, (c) is this invention. Explanatory drawing which shows typically the film thickness in the right-and-left both ends of the to-be-coated object apply | coated with the rotary spray coating apparatus which concerns on the method. The front view which shows typically the modification of embodiment of the rotary spray coating apparatus which concerns on the method of this invention. The perspective view which shows schematic structure of the rotary coating machine which comprises the principal part of a well-known rotary spray coating apparatus. (A) is a plan view schematically showing a known rotary spray coating apparatus, (b) is a front view schematically showing a known rotary spray coating apparatus, and (c) is applied by a known rotary spray coating apparatus. Explanatory drawing which shows typically the film thickness in the right-and-left both ends of a to-be-coated object.

  Hereinafter, an embodiment of a rotary spray coating method according to the present invention will be described in detail with reference to the drawings. In the present embodiment, six spray nozzles 3 are arranged on the surface of the building board as the object to be coated 5 on the same circumference of the rotary coating machine 2, that is, at a 60 ° pitch from the rotor rotation center. A case will be described as an example.

  Fig.1 (a) is a top view which shows typically the rotary spray coating apparatus A which concerns on the method of this invention. FIG.1 (b) is a front view which shows typically the rotary spray coating apparatus A which concerns on the method of this invention. In FIG. 1 (a), the rotary coating machine 2 is arranged substantially parallel to the rotation track surface of the spray nozzle 3 provided at the end of the rotor 21 (see FIG. 3) with a certain distance from the conveyor 4. The paint sprayed from each spray nozzle 3 in the form of a mist is sprayed onto an object to be coated 5 placed on the conveyor 4. At this time, the object to be coated 5 moves in the direction indicated by the white arrow in FIG.

  At this time, in the method of the present invention, as shown in FIGS. 1 (a) and 1 (b), four paint scattering prevention plates 1 are provided close to the object 5 to be coated. In this case, if the four paint scattering prevention plates 1 are provided substantially flush with the article 5 to be coated, it becomes more appropriate. Then, the position where the spray nozzle 3 that goes around the circumferential track is close to the upper part of the object 5 (the position indicated by a and b in FIG. 1A) and the position that is separated from the upper part of the object 5 (FIG. 1 ( The paint scattering prevention plate 1 is provided at a position indicated by a and d in a).

  As shown in FIG. 1B, the paint scattering prevention plate 1 is a support device (not shown) so that the paint scattering prevention plate 1 and the object to be coated 5 are close to each other and the surface thereof is substantially flush. Supported by. By doing so, both ends of the object to be coated 5 are sprayed under substantially the same conditions as the other parts of the surface of the object to be coated 5 by providing the paint scattering prevention plate 1, and the paint 6 is applied to the ends. It is possible to obtain an excellent coating film that is evenly coated and has no coating unevenness.

  FIG.1 (c) is explanatory drawing which shows typically the film thickness in the right-and-left both ends of the to-be-coated article 5 apply | coated as mentioned above. In FIG.1 (c), while showing the film thickness of the coating film obtained by the method of this invention by (circle), the film thickness shown in FIG.4 (c) obtained when apply | coating by the conventional method is also shown simultaneously. . As shown in FIG.1 (c), the film thickness in the both right-and-left both ends of the to-be-coated object 5 is improved, and the favorable coating film with few coating unevenness is obtained.

  In the present invention, the meaning that the paint scattering prevention plate 1 and the object to be coated 5 are provided close to each other does not necessarily mean that they are flush with each other in the height direction. Including the case where it is in a low position. Further, in the horizontal direction, since the paint scattering prevention plate 1 and the object to be coated 5 are literally provided close to each other, a gap may exist between the paint scattering prevention plate 1 and the object to be painted 5. Of course.

  FIG. 2 is a front view schematically showing a modification of the embodiment of the rotary spray coating apparatus A according to the method of the present invention. As shown in FIG. 2, in this modification, the outer end 11 of the paint scattering prevention plate 1 provided close to both sides of the article 5 on the conveyor 4 is raised, and the paint scattering prevention plate 1 itself. Is inclined to the object 5 side. By doing in this way, the sprayed paint can be prevented from scattering more efficiently.

  Further, a plurality of rows of spray coating lines may be provided in parallel, and the end portions and end portions of the adjacent objects to be coated 5 may be received by one paint scattering prevention plate 1 to prevent the paint from scattering. Further, not only the rotary coating machine 2 but also a reciprocator coating machine can be used to expect the same effect by using the paint scattering prevention plate 1.

  As described above, the rotary spray coating method according to the present invention can be freely changed in design, and all cases belong to the technical scope of the present invention unless departing from the scope of the claims.

A A rotary spray coating apparatus according to the method of the present invention b, a position where the spray nozzle is close to the upper part of the object to be coated; Coating thickness thinner than coating thickness 1 Paint scattering prevention plate 11 Outer end 2 Rotary coating machine 21 Rotor 3 Spray nozzle 4 Conveyor 5 Object 6 Paint

Claims (2)

  This is a method of painting an object placed on a conveyor by spraying paint from a spray nozzle whose rotating raceway surface is arranged parallel to the conveyor surface, and the spray nozzle arranged on the rotating raceway surface is coated A rotary spray coating method in which a paint scattering prevention plate is provided on both sides of the object to be coated on the conveyor so as to be adjacent to the object to be coated at a position close to the top of the object and a position away from the top of the object to be coated.   2. The rotary spray coating method according to claim 1, wherein the coating material scattering prevention plate is inclined by raising the outer end portion of the coating material scattering prevention plate provided close to both sides of the object to be coated on the conveyor.

Images