JP5190239B2 - How to paint building materials - Google Patents

Description

  The present invention relates to an interior material such as a flooring material, a staircase material, a wall material and a ceiling material in a building such as a house, and a coating method for a building material used as a fitting material such as a door.

  As a coating method for imparting a design, color, or the like having higher design properties to the building materials as described above, an inkjet coating method has been attracting attention. According to this ink-jet coating, ink droplets can be discharged in a non-contact state with respect to the building material to be coated, so that it can be applied even if the surface shape of the building material has irregularities, It is also possible to apply a pattern only to a necessary portion.

However, when building materials are painted by this inkjet coating, the coating device is large and installed in a factory, etc., unlike an inkjet printer that prints paper, etc., so various unique problems have been pointed out. ing.
FIG. 4 is a view for explaining a conventional method of painting a building material, and shows a partial schematic cross-sectional view of a painting apparatus.
In the figure, 100 is a building material to be coated, 200 is a conveying means including a conveying belt, 300 is a base, 400 is an ink head, 400a is an ink ejection port, 500 is an ink droplet, and m is a mist. The ink droplet 500 is schematically shown for explanation.

The ink droplets 500 ejected from the ink ejection port 400a are ejected in a liquid column shape and are separated into a plurality of minute ink droplets by the surface tension and air resistance of the ink droplets themselves before landing on the painted surface of the building material. Thus, it reaches a mist shape to reach the surface to be painted, realizing a dense and delicate coating.
However, at this time, the ejection direction of the ink droplets 500 ejected from the ink discharge port 400a is changed by the airflow due to the air flow generated along with the conveyance of the building material 1 or the airflow in the factory. As a result, the landing position of the ink droplet 500 is shifted, which causes a reduction in coating quality.
Further, mist m is likely to be generated around the ink discharge port 400a due to the air flow, and the mist m may adhere to the painted surface.

In Patent Document 1 below, an air curtain is provided upstream of the ink nozzle in the transport direction in order to prevent the air flow generated by the transport of the building material (building material) from adversely affecting the ink droplet ejection direction. Is formed.
JP 2007-117959 A

  However, in this case, in order to form an air curtain, it is necessary to provide the ink head with an air ejection port and a suction port, so that the ink head tends to be enlarged. In addition, if the temperature of the air curtain is too low, the painted surface may be cooled and the ink ride may deteriorate, and if the temperature is too high, the applied ink may be burnt and discolored. It was necessary to set the temperature at a low temperature, and it was difficult to control the temperature.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a building material coating method capable of preventing the generation of mist due to the influence of air flow and improving the coating quality by inkjet coating. .

In order to achieve the above object, the building material coating method according to claim 1 is a building material for performing inkjet coating by ejecting ink droplets from an ink discharge port of an ink head disposed above a coating surface of the building material. The ink head is provided with a shielding plate that extends downward from the side portion of the ink discharge port to the vicinity of the painting surface along the ink droplet ejection direction, and the shielding plate uses the shielding plate to A space between the ink discharge port and the coating surface is partitioned from a space outside thereof, and the building material is coated, and a plurality of the ink heads are arranged in parallel , and the space between the ink heads Further, a partition plate for partitioning the ejection space of each ink droplet is further provided .

The building material coating method according to claim 2 is characterized in that, in claim 1, the shielding plate is provided so as to surround the ink discharge port of the ink head.
In the building material coating method according to claim 3, in claim 1 or claim 2, the building material is coated while being conveyed by a conveying means, and the partition plate is provided in a direction substantially orthogonal to the conveying direction. A method of painting a building material characterized by that.

According to the building material coating method according to claim 1, the space between the ink discharge port and the coating surface is partitioned from the outer space by the shielding plate provided on the ink head, and the building material is coated. Therefore, the air flow that adversely affects the ejection direction of the ink droplets in the space between the ink discharge port and the paint surface can be blocked with a simple configuration. Therefore, it is possible to prevent adhesion of the mist to the painted surface, scattering of ink droplets, and deviation of the landing position of ink droplets, thereby improving coating quality.
In addition, in full color painting where a plurality of ink heads are arranged side by side, a partition plate for partitioning each ink droplet ejection space is further provided between the ink heads, so that air that adversely affects the ejection direction of the ink droplets is provided. Inflow can be prevented, and scattering of ink droplets can be prevented. Therefore, ink droplets ejected from the adjacent ink ejection ports are not mixed and the colors are not mixed, and the landing position of the ink droplets is prevented from being shifted, so that a precise and delicate full color coating can be realized.

  According to the method for painting a building material according to claim 2, since the shielding plate is provided so as to surround the ink discharge port of the ink head, the inflow of air that adversely affects the ink droplet ejection direction can be prevented more reliably. be able to.

According to the method for coating a building material according to claim 3, since ink droplets discharged from adjacent ink discharge ports are not mixed and the colors are not mixed, it is possible to realize a precise and delicate full color coating. it can.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic cross-sectional view illustrating a first embodiment of a building material coating method according to the present invention. 1st Embodiment is an example of the coating device by the inkjet injection system comprised with a single ink head.
The building material 1 to be coated is conveyed in the direction indicated by the white arrow by a conveying means 2 such as a roller conveyor configured on the base 3, and is an ink head disposed above the painted surface of the building material 1. The surface coating of the building material 1 is performed by ejecting ink droplets 5 from the H ink discharge ports 4a. The driving method of the nozzle head H is not particularly limited, and known methods can be applied as appropriate. Examples thereof include a piezo method and a valve method. The painted building material 1 is an exterior material such as an outer wall or a fence. Used for interior materials such as doors, floors, stairs, fences, handrails, shelves, kitchen panels, and ceilings.

The ink head H is provided with a shielding plate 6 that extends downward from the side portion of the ink discharge port 4a of the ink nozzle 4 to the vicinity of the coating surface 1a of the building material 1 so as to follow the ejection direction of the ink droplet 5. The building material 1 is painted by partitioning the space between the ink discharge port 4a and the coating surface 1a (hereinafter referred to as the ejection space A of the ink droplet 5) and the outer space by the shielding plate 6. Yes.
Therefore, since (d) between the lower end 6a of the shielding plate 6 and the painted surface 1a of the building material 1 is configured to be close enough not to contact the painted surface 1a, it adversely affects the ejection direction of the ink droplets 5. Air can be prevented from flowing into the injection space A.
If the shielding plate 6 is provided so as to surround the ink discharge port 4a of the ink head H, the inflow of air that adversely affects the ejection space A can be prevented more effectively.

The shielding plate 6 may be any material that can prevent the inflow of air, and is made of a metal material, a plastic material, or the like, and the material is not particularly limited.
Here, for the purpose of maintenance, the shielding plate 6 is configured to be detachable so that it can be periodically cleaned or replaced so that the ink droplets 5 attached to the shielding plate 6 do not fall. At this time, the cleaning of the shielding plate 6 may be performed by wiping off the ink droplets 5 automatically attached by a dedicated brush or wiper. Further, it is preferable that surface treatment such as water repellency and oil repellency is performed so that the adhered ink droplets 5 can be easily wiped off.

  According to the above, it is possible to prevent an air flow that adversely affects ink jet painting without requiring a special control device for preventing the inflow of air and without being a coating device housed in a housing. . Therefore, it is possible to prevent the mist from adhering to the paint surface, the ink droplets 5 from being scattered, and the ink droplets 5 from landing positions being shifted, and the coating quality can be improved.

Next, a second embodiment will be described based on FIGS. FIG. 2 is a schematic cross-sectional view illustrating a second embodiment of the building material coating method according to the present invention, and FIG. 3 is a schematic plan view for illustrating the building material coating method of the embodiment.
2nd Embodiment is an example of the coating device by the inkjet injection system in which full color coating is possible. Here, the description will focus on the differences from the first embodiment, and the same components as those in the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted.

In FIG. 3, the coating apparatus 10 includes a control unit 20 equipped with a CPU and the like, an inkjet coating unit 40 having an ink head H that coats the building material 1, and the building material 1 that is configured and placed on the base 3. It is provided with a transport means 2 for transport, and is controlled in conjunction with the ink droplet 5 ejection operation by the inkjet coating unit 40 to transport the building material 1 in the direction indicated by the white arrow.
In the drawing, 30 is an apparatus main body provided adjacent to the base 3, and 50 is a nozzle head arm that is connected to the apparatus main body 30 and supports the inkjet coating unit 40.
In addition, although the example in which the wood grain pattern was painted on the building material 1 is shown in FIG. 3, it is not limited to this.

As shown in FIGS. 2 and 3, four nozzle heads H are arranged in parallel, and ink droplets 5 of black, yellow, magenta, and cyan are ejected, respectively.
The driving method of the nozzle head H is not particularly limited as described above, and a known method can be applied as appropriate. Examples thereof include a piezo method and a valve method.
The ink head H is provided with a shielding plate 6 that extends downward from the side portion of the ink discharge port 4a of the ink nozzle 4 to the vicinity of the coating surface 1a of the building material 1 so as to follow the ejection direction of the ink droplet 5. In this embodiment, the shielding plate 6 is provided on each of the ink heads H positioned on the upstream side and the downstream side in the transport direction in which the building material 1 is transported.
A partition plate 7 is provided between the ink heads H to partition the ejection space A of each ink droplet 5. The lower end 6 a of the shielding plate 6 and the lower end 7 a of the partition plate 7 are It is comprised so that it may adjoin so that the coating surface 1a of the building material 1 may not be touched.

The shielding plate 6 and the partition plate 7 may be made of a homogeneous material such as a metal material or a plastic material and can prevent the inflow of air, and the material is not particularly limited.
Here, for the purpose of maintenance, the shielding plate 6 and the partition plate 7 are configured to be detachable so that the ink droplets 5 attached to the shielding plate 6 and the partition plate 7 do not fall. . At this time, the cleaning of the shielding plate 6 and the partition plate 7 may be performed by wiping off the ink droplets 5 automatically attached by a dedicated brush or wiper. Further, it is preferable that surface treatment such as water repellency and oil repellency is performed so that the adhered ink droplets 5 can be easily wiped off.

According to the above, the provision of the shielding plate 6 and the partition plate 7 prevents the inflow of air that adversely affects the ejection direction of the ink droplets 5 even when full-color coating is applied, and the scattering of the ink droplets 5 and the ink droplets. The deviation of the landing position of 5 can be prevented.
In addition to the shielding plates 6 provided on the upstream side and the downstream side in the transport direction, the partition plate 7 is provided between the ink heads H, so that the ink droplets 5 ejected from the adjacent ink ejection ports 4a are mixed. Since the colors are not mixed, a precise and delicate full color coating can be realized.

  In addition, although the surface coating process of the building material 1 is illustrated and described here, the present invention is not limited to this, and the present invention can also be applied to edge (end surface) coating of the building material 1. Moreover, it is not limited to the example which coats the building material 1 conveyed by the conveyance means 2, It is applicable also to what moves and moves the ink head H of the inkjet coating unit 40 with respect to the building material 1 made into the fixed state. is there.

It is a schematic sectional drawing explaining 1st Embodiment of the coating method of the building material in this invention. It is a schematic sectional drawing explaining 2nd Embodiment of the coating method of the building material in this invention. It is a schematic plan view for demonstrating the coating method of the building material of the embodiment. It is a schematic sectional drawing for demonstrating the coating method of the conventional building material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Building material 1a Painted surface H Ink head 4 Ink nozzle 4a Ink discharge port 5 Ink droplet 6 Shielding plate 7 Partition plate

Claims (3)

A building material coating method for performing inkjet coating by ejecting ink droplets from an ink discharge port of an ink head disposed above a coating surface of a building material,
The ink head is provided with a shielding plate extending downward from the side portion of the ink ejection port to the vicinity of the coating surface along the ink droplet ejection direction, and the ink ejection port and the coating surface are formed by the shielding plate. Partition the space between and the outside space, and paint the building materials ,
A method for painting a building material , wherein a plurality of the ink heads are arranged side by side, and a partition plate for partitioning the ejection space of each ink droplet is further provided between the ink heads . In claim 1,
The building material coating method, wherein the shielding plate is provided so as to surround the ink discharge port of the ink head. In claim 1 or claim 2,
The building material is painted while being conveyed by a conveying means,
The building material coating method, wherein the partition plate is provided in a direction substantially orthogonal to the conveying direction .

Images