JP4778243B2 - Substrate coating method - Google Patents

Description

  The present invention relates to a base material coating method for coating a base material such as an exterior building material having an uneven surface.

  When coating base materials such as ceramics inorganic boards used as exterior building materials, etc., especially for those with irregularities on the surface, it is difficult to spread the paint to the concave parts of the surface with normal roll coating Conventionally, coating is performed using a spray coating apparatus (rotary spray coating apparatus; see Patent Document 1 or the like) including a spray nozzle that circulates in a substantially horizontal orbit.

In applying a paint using such a spray coating apparatus, for example, the spray coating apparatus as described above is disposed above the transport path of the substrate, and the uneven surface is disposed above. While spraying, the spray nozzle of the spray coating device is rotated in a substantially horizontal direction and the paint is sprayed toward the base material below. In this way, the paint is spread over the entire surface of the base material. At this time, the paint 9 is sufficiently applied to the inner surface of the recess.
JP 2000-61364 A

  However, even if the spray coating apparatus as described above is used, it is difficult to sufficiently spread the coating material to the inner surface of the concave portion of the substrate having irregularities. In particular, in recent years, high exterior design materials having a deep concavo-convex pattern on the surface have been demanded, but the surface of the base material having such a deep concavo-convex extends to the inside of the recess. It was very difficult to apply the paint over the entire surface.

  The present invention has been made in view of the above points. When coating the surface of a substrate having irregularities, the coating is sufficiently distributed to the inner surface of the concave portion of the substrate, It aims at providing the coating method of the base material which can apply | coat over the whole.

  The base material coating method according to the present invention is a base material coating method in which a coating material 9 is applied to a surface of a base material 1 having an uneven surface. A plurality of spray coating apparatuses 3 including 2 are provided above the transport path 5 of the base material 1 along the transport direction of the base material 1, and at least one of the plurality of spray coating apparatuses 3 is sprayed. In a state where the spray nozzle 2 of each spray coating device 3 is rotated so that the nozzle 2 rotates in the direction opposite to that of the other spray coating device 3, the base 1 is transported from the spray nozzle 2 while being transported. The paint 9 is sprayed toward the upper surface of the material 1. When the coating material 9 is sprayed from the spray nozzle 2 that makes a circling motion, the spraying direction of the coating material 9 inclines toward the direction depending on the kinetic energy and centrifugal force of the coating material 9 itself at the time of spraying. The spraying directions of the paint 9 from the spray nozzles 2 that circulate in the opposite directions are different from each other. For this reason, even if there is a portion where the paint 9 is difficult to be applied when the spray nozzle 2 circulates in only one direction, the paint 9 can be applied to such a portion by the spray nozzle 2 that circulates in the reverse direction. As a result, the coating material 9 can be evenly distributed over the surface of the substrate 1 having irregularities.

  Another substrate coating method according to the present invention is a substrate coating method in which a coating material 9 is applied to the upper surface of a substrate 1 having an uneven surface. Is provided above the carrying path 5 of the base material 1, and the spray coating apparatus 3 provided with the spray nozzles 2 that circulate around the substantially horizontal orbit 4 is provided on the roll coating apparatus above the carrying path 5 of the base material 1. 6, the paint coating roll 10 is rotated while supplying the paint 9 to the surface thereof, and the spray nozzle 2 is rotated while the spray nozzle 2 is rotated. After the coating material 9 is applied, the coating material 9 is sprayed from the spray nozzle 2 toward the upper surface of the substrate 1. When the coating material 9 is applied to the surface of the base material 1 by the roll coating device 6, the coating material 9 is applied to the surface of the convex portion of the surface of the base material 1 having irregularities, and the vicinity of the opening edge of the concave portion 7. The coating material 9 adheres to the surface, and a liquid reservoir 21 having a large coating amount of the coating material 9 is formed in the vicinity of the opening edge. Next, the coating pressure of the coating material 9 applied by the spray coating device 3 is applied to the coating material 9 on the substrate 1 to induce the flow of the coating material 9 in the coating film, and the coating material 9 flows into the inside of the recess 7. When the paint 9 in the liquid pool 21 at the opening edge of the recess 7 flows into the recess 7, sufficient paint 9 flows into the recess 7 to reach the inner surface of the recess 7.

  In the base material coating method as described above, the depth dimension D of the concave portion 7 on the upper surface of the base material 1 is preferably equal to or larger than the opening width dimension W. Even when such a deep concave portion 7 is provided, the concave portion 7 is provided. The paint 7 can be spread to the inner surface of.

  In the present invention, it is possible to prevent a portion where the coating material 9 is not applied on the inner surface of the concave portion on the surface of the base material, and to spread the coating material 9 uniformly on the surface of the base material 1 having the unevenness. It is something that can be done.

  Hereinafter, the best mode for carrying out the present invention will be described.

  As the base material 1, those having an appropriate material and shape can be used. For example, a cement composition obtained by mixing an aggregate, a fiber, a colorant and the like with cement as necessary and kneading with water is used as a base plate 1. A ceramic-type inorganic board such as a cement-molded board obtained by curing the molded body after curing into a shape can be used.

  The substrate 1 has irregularities on the surface. For example, when the above-described cement-molded plate is used as the base material 1, such irregularities may be formed by transferring a concavo-convex pattern with a roll press or a flat plate press when curing the cement composition, or curing and curing. It can be formed by subjecting the subsequent cement molded body to cutting or the like.

  The shape of the irregularities on the surface of the base material 1 can be set appropriately. For example, by providing a plurality of vertical and horizontal grooves in a lattice shape on the surface of the base material 1, the groove portion is the concave portion 7, and other portions. Can be formed as the convex portion 8. For example, in the example shown in FIG. 3A, the concave portion 7 having a V-shaped cross section is provided on the surface of the base material 1, and the other portion of the base material 1 is formed as the convex portion 8. In the illustrated example, the concave portion 7 is formed as a groove having a substantially V-shaped cross section, but the cross sectional shape of the concave portion 7 is not limited to this.

  In the present invention, the base material 1 having such irregularities is applied by applying the paint 9 over the entire surface as shown in FIG. The coating 9 is sufficiently distributed also to the inner surface of the recess 7.

  In FIG. 1, an example of the process for enforcing the coating method of the base material which concerns on this invention is shown. In this coating process, a plurality of spray coating apparatuses 3 are provided along the transport path 5 of the base material 1. In the illustrated example, the transport path 5 of the base material 1 is provided with a plurality of transport rolls 15. The heating device 11, the back surface sealer coating device 12, the first spray coating device 3 a, the sand spraying device 13, the second spray coating device 3 b, and the heating device are configured in order from the upstream side along the transport path 5. 14 is provided.

  The heating device 11 heats the base material 1 to dry the base material 1, or heats the base material 1 to a temperature suitable for coating and film formation of the paint (the temperature of the base material 1 is too low to form the paint 9. Is provided to raise the temperature to a temperature at which the temperature is not hindered.

  Moreover, the back surface sealer coating device 12 is provided to apply a sealer to the back surface of the substrate 1 as necessary. The sealer means that when the back surface and the surface of the base material 1 are overlapped when the base material 1 after coating is stacked, the paint on the surface of one base material 1 adheres to the back surface of the other base material 1 and peels off. Applied for purposes such as preventing. In the illustrated back surface sealer coating device 12, a sealer coating roll 16 and a doctor roll 17 are disposed on the lower side of the transport path 5 of the substrate 1, and a nozzle 18 and the like are provided between the sealer coating roll 16 and the doctor roll 17. The sealer is applied to the back surface of the base material 1 by rotating the sealer application roll 16 in contact with the back surface of the base material 1. Further, a backup roll 19 is disposed above the carrying path 5 of the base material 1 facing the sealer coating roll 16, and the base material 1 is sandwiched between the sealer coating roll 16 and the backup roll 19. A sealer is applied to the back surface of the substrate 1.

  Moreover, the sand spreading | diffusion apparatus 13 is provided in order to give the surface decoration which provides a granular protrusion on the surface of the base material 1, and is suitably provided as needed. The sand spraying device 13 is configured by providing a spray nozzle 20 for spraying sand above the carrying path 5 of the base material 1.

  The heating device 14 is provided for heating and forming the coating material 9 applied to the base material 1, and the heating temperature and the heating time are appropriately adjusted according to the composition of the coating material 9. .

  Each of the first and second spray coating apparatuses 3 includes one or a plurality of spray nozzles 2 that circulate around a substantially horizontal orbit 4. In the illustrated spray coating apparatus 3, the spray nozzles 2 are respectively provided on a plurality of arm portions 25 that project radially downward from a substantially vertical rotation axis of a rotating body 24 having a coating 9 supply mechanism inside, The plurality of injection nozzles 2 are arranged side by side on a substantially horizontal circumference around the rotation axis. Each spray nozzle 2 sprays the paint 9 supplied via the arm portion 25 downward.

  In the spray coating apparatus 3, each spray nozzle 2 rotates around a substantially horizontal circumferential track by rotating the rotating body 24 around the rotation axis. The diameter of the circumferential track of the spray nozzle 2 Is larger than the width dimension of the base material 1 that transports the transport path 5. Further, when the substrate 1 is transported in a state where a plurality of substrates 1 are arranged in a direction orthogonal to the transport direction as shown in the drawing, the substrate 1 is disposed at one side edge and the other side end disposed at one side end. The diameter of the circular track 4 is made larger than the width dimension between the other edge of the substrate 1.

  Here, the 1st and 2nd spray coating apparatuses 3a and 3b formed as mentioned above operate | move so that the surrounding direction of the injection nozzle 2 may become a mutually reverse direction.

  When applying the base material 1 in the coating step of the coating material 9 configured as described above, first, the uneven surface is arranged on the upper side of the base material 1, and a plurality of sheets (in a direction orthogonal to the transport direction ( Two sheets in the figure) are sequentially supplied to the starting end of the carrying path 5 in a state where they are arranged side by side. The substrate 1 is first heated by passing through the heating device 11. The heating conditions at this time are appropriately adjusted according to the purpose of heating. For example, when the temperature of the substrate 1 is raised to a temperature suitable for coating and film formation, the temperature of the substrate 1 is 25 to 45 ° C. Can be heated.

Next, a sealer is applied to the back surface by the back surface sealer coating device 12. As the sealer, for example, an acrylic styrene-based resin containing a viscosity of 9 ± 2 seconds by Iwata Cup NK-2 can be used, and its coating amount is, for example, 13.1-19.6 g / m ² ( It is preferable to be in the range of 1.2 to 1.8 g / scale ² ).

  Next, the base material 1 passes below the first spray coating device 3a, and at this time, the first spray coating device 3a rotates the rotating body 24 so that the spray nozzle 2 circulates in the circumferential path. At the same time, the base material 1 is allowed to pass through while the paint 9 is being sprayed from the spray nozzle 2 toward the base material 1. At this time, when the spray nozzle 2 passes so as to cross over the base material 1, the spray nozzle 2 is opened to spray the paint 9, and after crossing over the base material 1, both sides of the circumferential track ( When the base material 1 is not disposed below the base material 1 by being positioned on both sides of the base material 1 in the direction orthogonal to the conveying direction, the spray nozzle 2 is closed so that the paint 9 is not sprayed. It is preferable to reduce the waste of the paint 9.

When coating is performed by the first spray coating apparatus 3a, the rotational speed of the spray nozzle 2 can be set appropriately, but it is preferable to rotate the spray nozzle in a range of 20 to 40 rpm. The spray pressure of the paint 9 from the spray nozzle 2 can also be set appropriately. For example, the spray nozzle 2 is simultaneously supplied to the spray nozzle 2 at a pressure of 10.8 MPa (110 kg / cm ² ). The paint 9 can be sprayed from the spray nozzle 2 by supplying air at a pressure of 0.49 MPa (5 kg / cm ² ).

At this time, an appropriate material can be used as the paint 9, but for example, an organic paint (organic emulsion paint) such as an acrylic resin emulsion paint can be used. Further, the viscosity of the paint 9 is suitably adjusted so that it is suitable for spraying from the spray nozzle 2 and is applied in the form of a film on the upper surface of the substrate 1, but the viscosity by Iwata Cup NK-2 is in the range of 40 ± 10 seconds. It is preferable that Further, the coating amount of the paint 9 by the first spray coating apparatus 3a is also adjusted as appropriate, so that it is in the range of 81.7 to 92.6 g / m ² (7.7 to 8.5 g / scale ² ). It is preferable to do.

  Next, the base material 1 passes through the sand spraying device 13. At this time, when applying a granular surface makeup to the base material 1, sand is sprayed on the upper surface thereof. Silica sand or the like can be used as the material of the sand, and its particle diameter, spraying amount, etc. are adjusted as appropriate.

Next, the base material 1 passes below the second spray coating apparatus 3b. At this time, the second spray coating apparatus 3b performs the same process as in the case of the first spray coating apparatus 3a. In this case, the coating material 9 is sprayed onto the upper surface of the first spraying device 1. At this time, the rotating nozzle 24 of the second spray coating device 3 b is rotated to the opposite side to the first spray coating device 3 a, thereby causing the spray nozzle 2 to move upward. In this state, the paint 9 is sprayed from the spray nozzle 2 by rotating in the opposite direction to the first spray coating apparatus 3a. At this time, as the paint 9, an appropriate one similar to that in the first spray coating apparatus 3a can be used, but usually the same paint 9 as that in the first spray coating apparatus 3a is used. The coating amount of the paint 9 by the second spray coating apparatus 3b is preferably in the range of, for example, 81.7 to 92.6 g / m ² (7.7 to 8.5 g / scale ² ). The total coating amount of the coating material 9 applied to the substrate 1 is preferably in the range of 152 to 196 g / m ² (14 to 18 g / scale ² ).

  Next, the base material 1 passes through the heating device 14, and at this time, the coating material 9 applied to the base material 1 is heated to form a film. The heating conditions at this time are appropriately adjusted according to the composition of the paint 9, the coating amount, and the like. For example, by heating at 120 to 170 ° C. for 42 seconds, the plate temperature of the substrate 1 becomes 80 to 90 ° C. Can be heated.

  When the base material 1 is coated as described above, the circumferential direction of the spray nozzle 2 in the first spray coating apparatus 3a and the circumferential direction of the spray nozzle 2 in the second spray coating apparatus 3b are opposite to each other. Therefore, it is possible to prevent a portion where the coating material 9 is not applied on the inner surface of the concave portion 7 on the surface of the base material 1 and to uniformly apply the coating material 9 on the surface of the base material 1 having the unevenness. Can be spread. That is, when the coating material 9 is sprayed from the spray nozzle 2 that makes a circling motion, the spraying direction of the coating material 9 is inclined in a direction that depends on the kinetic energy and centrifugal force of the coating material 9 itself at the time of spraying. It will be. For this reason, the spraying directions of the paint 9 from the spray nozzles 2 that circulate in opposite directions are different from each other, and the paint 9 is sprayed in various directions from the upper side of the substrate 1. Thus, even when there is a portion where the paint 9 is difficult to be applied when the spray nozzle 2 circulates in only one direction, the paint 9 can be applied to such a portion by the spray nozzle 2 that circulates in the opposite direction. Thus, the coating material 9 can be distributed evenly on the surface of the substrate 1 having the unevenness as described above.

  When providing the spray coating apparatus 3, it is not restricted to the above forms, For example, three or more spray coating apparatuses 3 are provided along the carrying path 5 of the base material 1, and at least one of them is sprayed. The spray nozzles 2 of the spray coating apparatuses 3 may be rotated in such a manner that the spray nozzles 2 of the coating apparatus 3 rotate in the direction opposite to the other spray coating apparatuses 3.

  In FIG. 2, the other example of the process for enforcing the coating method of the base material which concerns on this invention is shown. In this coating process, a roll coating device 6 is provided on the upstream side along the carrying path 5 of the base material 1, and a spray coating device 3 is provided on the downstream side. In the illustrated example, along the carrying path 5. A heating device 11, a roll coating device 6, a sand spraying device 13, a spray coating device 3, and a heating device 14 are provided in this order from the upstream side.

  As the heating apparatus 11, the sand spraying apparatus 13, and the heating apparatus 14, the thing similar to what is shown in the said FIG. 1 is provided.

  In the roll coating apparatus 6, the paint application roll 10 and the doctor roll 22 are disposed on the upper side of the transport path 5 of the substrate 1, and the nozzle 23 and the like are provided between the paint application roll 10 and the doctor roll 22. The coating material 9 is supplied from. The coating material 9 is applied to the surface of the base material 1 by rotating the coating material application roll 10 in contact with the surface of the base material 1. As a material for the peripheral surface of the coating roll 10, it is preferable to employ a flexible soft material such as sponge or rubber.

  The illustrated roll coating device 6 also has a function as the back surface sealer coating device 12. That is, a sealer application roll 16 and a doctor roll 17 are disposed below the carrying path 5 of the substrate 1 facing the paint application roll 10, and a nozzle is provided between the sealer application roll 16 and the doctor roll 17. A sealer is supplied from 18 etc., and this sealer is applied to the back surface of the substrate 1 by rotating the sealer application roll 16 in contact with the back surface of the substrate 1. In addition, the paint coating roll 10 facing the sealer coating roll 16 functions as a backup roll 19, and the base material 1 is sandwiched between the sealer coating roll 16 and the paint coating roll 10 on the back surface of the base material 1. A sealer is applied.

  Moreover, as the spray coating apparatus 3, what has the structure similar to what is shown in the said FIG. 1 can be provided.

  When applying the base material 1 in the coating step of the coating material 9 configured as described above, first, the uneven surface is arranged on the upper side of the base material 1, and a plurality of sheets (in a direction orthogonal to the transport direction ( Two sheets in the figure) are sequentially supplied to the starting end of the carrying path 5 in a state where they are arranged side by side. The substrate 1 is first heated to a predetermined temperature by passing through the heating device 11.

  Next, the base material 1 is coated with the coating material 9 on the surface and the sealer on the back surface by the roll coating device 6 that also serves as the back surface sealer coating device 12. The composition and application amount of the sealer can be the same as those in the embodiment shown in FIG.

  When the coating material 9 is applied to the surface of the base material 1 with such a roll coating device 6, the coating material 9 is applied to the surface of the convex portion 8 on the surface of the base material 1 having irregularities. It is difficult for the paint 9 to pass through to the inside. However, when the paint application roll 10 comes into contact with the recess 7 of the base material 1, the paint 9 on the surface of the paint application roll 10 matching the recess 7 adheres to the vicinity of the opening edge of the recess 7. As shown in FIG. 4A, a portion (a liquid reservoir 21 portion) where the amount of the coating material 9 is large is formed. In particular, when a material made of a soft material is used as the paint application roll 10, the paint application roll 10 is narrowed down to the inside of the recess 7 at the position of the recess 7 when the paint application roll 10 and the substrate 1 are in contact with each other. For this reason, the adhesion amount of the coating material 9 in the liquid reservoir 21 is particularly increased.

As the coating material 9 applied by the roll coating device 6, an appropriate material can be used in the same manner as the coating material applied by the spray coating device 3 in the embodiment shown in FIG. Further, the viscosity of the paint 9 is suitable for application by the paint application roll 10 and is appropriately adjusted so that it is applied in a film shape on the upper surface of the substrate 1 and a sufficient amount of the paint 9 is secured in the liquid reservoir 21. However, it is preferable that the viscosity by Iwata Cup NK-2 is in the range of 40 ± 10 seconds. The amount of coating 9 applied by the roll coating device 6 is also adjusted as appropriate, but it should be in the range of 81.7 to 92.6 g / m ² (7.7 to 8.5 g / scale ² ). preferable.

  Next, the base material 1 passes through the sand spraying device 13. At this time, when applying a granular surface makeup to the base material 1, sand is sprayed on the upper surface thereof. The sand material, particle diameter, spraying amount, and the like are appropriately adjusted as in the embodiment shown in FIG.

  Next, the base material 1 passes below the spray coating device 3, and at this time, the first spray coating device 3 a rotates the rotating body 24 so that the spray nozzle 2 circulates in a circular path and the above-mentioned. In a state where the coating material 9 is sprayed from the spray nozzle 2 toward the base material 1, the base material 1 is allowed to pass through. At this time, when the spray nozzle 2 passes so as to cross over the base material 1, the spray nozzle 2 is opened to spray the paint 9, and after crossing over the base material 1, both sides of the circumferential track ( When the base material 1 is not disposed below the base material 1 by being positioned on both sides of the base material 1 in the direction orthogonal to the conveying direction, the spray nozzle 2 is closed so that the paint 9 is not sprayed. It is preferable to reduce the waste of the paint 9.

  In this way, when the coating material 9 is applied by the spray coating device 3, a coating film of the uncured coating material 9 applied by the roll coating device 6 is formed on the surface of the substrate 1, When the coating material 9 is sprayed from the spray coating device 3 onto this coating film, the spraying pressure is applied to the coating material 9 on the substrate 1, so that the flow of the coating material 9 in the coating film as shown in FIG. Is induced, and the paint 9 flows into the inside of the recess 7. For this reason, even when the coating material 9 is not sufficiently applied to the inner surface of the concave portion 7 during coating by the roll coating device 6, the coating material 9 is caused to flow into the concave portion 7 by the spraying of the coating material 9 by the spray coating device 3. As shown in 4 (c), the paint 9 can be sufficiently spread over the inner surface of the recess 7. In addition, since the liquid pool 21 is generated at the opening edge of the concave portion 7 as described above, the paint 9 in the liquid pool 21 flows into the concave portion 7, thereby reaching the inner surface of the concave portion 7. Therefore, sufficient coating material 9 will flow into the inside of the recess 7.

In the case of performing such coating by the spray coating apparatus 3, the rotational speed of the spray nozzle 2 can be set appropriately, but it is preferable to rotate the spray nozzle in a range of 20 to 40 rpm. Also, the spraying pressure of the paint 9 from the spray nozzle 2 can sufficiently promote the flow of the paint 9 in the coating film of the uncured paint 9 applied by the roll coating device 6 by the spraying of the paint 9. For example, the coating material 9 is supplied to the injection nozzle 2 at a pressure of 10.8 MPa (110 kg / cm ² ), and at the same time, air is supplied to the injection nozzle 2 at a pressure of 0.49 MPa (5 kg / cm ² ). By supplying, the paint 9 can be sprayed from the spray nozzle 2. At this time, as the paint 9, an appropriate one similar to that in the spray coating apparatus 3 (3 a, 3 b) in the embodiment shown in FIG. 1 can be used, but usually the same paint 9 as that of the roll coating apparatus 6. Is used. The coating amount of the coating material 9 due to the injection coating apparatus 3 is preferably set to be in the range of, for example, 81.7~92.6g / m ² (7.7~8.5g / scale ^2). The total coating amount of the coating material 9 applied to the substrate 1 is preferably in the range of 152 to 196 g / m ² (14 to 18 g / scale ² ).

  Next, the base material 1 passes through the heating device 14, and at this time, the coating material 9 applied to the base material 1 is heated to form a film. The heating conditions at this time are appropriately adjusted according to the composition of the paint 9, the coating amount, and the like. For example, by heating at 80 to 100 ° C. for 50 seconds, the plate temperature of the substrate 1 becomes 50 to 80 ° C. can do.

  When the base material 1 is coated as described above, it is possible to prevent a portion where the coating material 9 is not applied on the inner surface of the concave portion 7 or the like on the surface of the base material 1, and to form a base having unevenness. The paint 9 can be uniformly distributed on the surface of the material 1.

  The coating method shown in each of these embodiments is particularly suitable for the coating of the base material 1 in which the concave portion 7 having the depth dimension D larger than the opening width dimension W is formed. That is, it is difficult to spread the coating material 9 to the inner surface of the concave portion 7 by coating with the spray coating device 3 in the case of rotating the spray nozzle 2 only in one direction, or by coating only with the roll coating device 6. When the depth dimension D is larger than the opening width dimension W, it becomes extremely difficult. However, according to the coating method as shown in the above embodiments, the depth dimension D of the recess 7 is Even when the opening width dimension W is equal to or larger than that, the paint 9 can be reliably applied to the inside of the recess 7. Such an effect is remarkably exhibited particularly when the opening width dimension W and depth dimension D of the recess 7 and the ratio of the former to the latter are in the range of 1: 1 to 3: 5. Further, the dimensions of the recess 7 are preferably, for example, an opening width dimension W of 3 to 7 mm and a depth dimension D of 5 to 10 mm. As a specific example, the recess 7 has an opening width dimension at intervals of 20 mm. A plurality of vertical and horizontal grooves with W of 5 mm and depth D of 7 mm can be provided.

An example of embodiment of this invention is shown, (a) is a side view, (b) is a top view. The other example of embodiment of this invention is shown, (a) is a side view, (b) is a top view. (A) is sectional drawing which shows an example of a base material, (b) is sectional drawing which shows the state which applied the coating material to the base material shown to (a). FIG. 2 shows a state in which a coating material is applied to a substrate in the embodiment shown in FIG. 2, and (a) to (c) are cross-sectional views.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 2 Injection nozzle 3 Spray coating apparatus 4 Circulation track 5 Carrying path 6 Roll coating apparatus 7 Concave part 9 Paint 10 Paint coating roll W Opening width dimension D Depth dimension

Claims (2)

In a coating method for a base material, in which a base material having a concavo-convex surface is conveyed and a paint is applied to the surface of the base material, the depth dimension of the concave portion on the upper surface of the base material is equal to or larger than the opening width dimension, A plurality of spray coating apparatuses including spray nozzles that circulate around the base material are provided above the transport path of the base material along the transport direction of the base material, and the spray nozzles of at least one spray coating apparatus among the plurality of spray coating apparatuses are While the other spray coating device circulates in the opposite direction and rotates the spray nozzle of each spray coating device, the paint is sprayed from the spray nozzle toward the upper surface of the base material while transporting the base material. A method of coating a base material, characterized in that: In a base material coating method in which a base material is coated on its upper surface while conveying a base material having irregularities on the surface, a roll having a paint application roll in which the depth dimension of the concave portion on the upper surface of the base material is equal to or greater than the opening width dimension A coating apparatus is provided above the transport path of the base material, and a spray coating apparatus having a spray nozzle that circulates in a substantially horizontal orbit is provided on the downstream side of the roll coating apparatus above the transport path of the base material. The coating nozzle is rotated while the coating roller is rotated while supplying the coating material and the spray nozzle is rotated around the surface. A coating method for a base material, characterized in that a coating material is sprayed toward the upper surface of the base material.

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