Coating apparatus and method for manufacturing foam

Abstract

To provide a coating device capable of reducing liquid coating variation.SOLUTION: This coating applicator comprises: an arranging unit in which an object to be coated is disposed; and a coating head that moves to a plurality of predetermined positions relative to the arrangement unit. The coating head includes a first nozzle for spraying a liquid, a connection provided with the first nozzle, a projection that projects from the connection, and a second nozzle provided at the tip of the projection to spray the liquid. The axes of the second nozzle and the projection and the axis of the first nozzle incline in a direction for separation from each other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a coating apparatus and a method for manufacturing a foam.

Background Art

[0002] As a technique for applying a liquid to an object to be coated, Patent Document 1 discloses a technique in which holes are provided in a roller or the like that compresses an object to be coated (sheet pad) made of a foamed resin material, and the liquid is supplied from the holes to the object to be coated simultaneously with the compression of the object to be coated.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technique of Patent Document 1, since the liquid is supplied to the object to be coated simultaneously with the compression of the object to be coated, it is necessary for a roller or the like to contact the entire surface where the liquid is applied. However, for an object to be coated having a complex shape such as a bag shape or a recessed shape, a roller or the like may not contact the bag-shaped or recessed portion, resulting in variations in the liquid application. Even when an operator manually applies a liquid to an object to be coated using a single spray gun, there will be portions where the liquid application is sufficient and portions where the liquid application is insufficient, especially in the bag-shaped or recessed portions, resulting in variations in the liquid application.

[0005] The present invention has been made to solve this problem, and an object thereof is to provide a coating apparatus and a method for manufacturing a foam that can reduce variations in liquid application even for an object to be coated having a complex shape such as a bag shape or a recessed shape.

Means for Solving the Problems

[0006] To achieve this objective, the coating apparatus of the present invention comprises a placement section on which the object to be coated is placed, and a coating head section that moves to a plurality of predetermined positions relative to the placement section. The coating head section comprises a first nozzle for spraying liquid, a connecting section on which the first nozzle is provided, a protruding section extending from the connecting section, and a second nozzle provided at the tip of the protruding section for spraying liquid, wherein the axes of the second nozzle and the protruding section and the axis of the first nozzle are inclined in directions away from each other.

[0007] The present invention provides a method for manufacturing a foam, comprising a coating step of applying a liquid to an object to be coated using a coating apparatus. The object to be coated comprises a surface and a back surface opposite to the surface in the thickness direction. The back surface of the object to be coated has a base surface, an upright surface rising from the base surface, and a facing surface connected to the upright surface with a space between them and a part of the base surface. In the coating step, a first nozzle sprays the liquid at least onto the base surface, and a second nozzle sprays the liquid at least onto the upright surface and the facing surface. [Effects of the Invention]

[0008] According to the coating apparatus described in claim 1, since the axes of the second nozzle and the protrusion and the axis of the first nozzle are inclined to be away from each other, the other nozzle can be used to coat parts of the object that cannot be coated with either the first or second nozzle alone. This reduces the areas where the liquid is not adequately coated, thereby reducing variations in the application of the liquid to the object.

[0009] According to the coating apparatus of claim 2, in the coating apparatus of claim 1, since the length of the protruding portion is longer than the distance between the position where the first nozzle is attached to the connection portion and the tip of the first nozzle, it becomes easier to apply the liquid to the inner parts of objects to be coated, even if they have a bag-like or recessed shape, and the areas where the liquid is not sufficiently applied can be reduced. Therefore, variations in the application of the liquid to the object to be coated can be further reduced.

[0010] According to the coating apparatus of claim 3, in the coating apparatus of claim 1 or 2, since the second nozzle and protrusion are thinner than the first nozzle, the second nozzle and protrusion can be inserted into narrow areas where the first nozzle cannot fit to apply the liquid. Therefore, the areas where the liquid is not adequately applied can be reduced.

[0011] According to the coating apparatus described in claim 4, in the coating apparatus described in any one of claims 1 to 3, the particle size of the liquid sprayed from the second nozzle is smaller than the particle size of the liquid sprayed from the first nozzle, so the liquid sprayed from the second nozzle is more likely to become a mist compared to the liquid sprayed from the first nozzle. Since the liquid sprayed from the second nozzle can be sprayed further, it is possible to easily apply the liquid to parts with recessed shapes.

[0012] According to the foam manufacturing method described in claim 5, since the axes of the second nozzle and the protrusion and the axis of the first nozzle are inclined in directions away from each other, even for objects to be coated that have upright surfaces or opposing surfaces that are difficult to coat with the first nozzle alone, it becomes easier to coat the upright surface, the opposing surface and the base surface of the part facing the opposing surface, and the area where the liquid is not adequately coated can be reduced. Therefore, variations in the application of the liquid to the object to be coated can be reduced.

[0013] According to the foam manufacturing method described in claim 6, in the foam manufacturing method described in claim 5, when spraying liquid onto the upright surface and the opposing surface, the tip of the second nozzle is positioned in the space facing the upright surface, making it difficult for the sprayed liquid to spread outside the space. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic diagram of a coating apparatus in one embodiment. [Figure 2] This is a rear view of the object to be coated. [Figure 3] (a) is a cross-sectional view of the object to be coated along line III-III in Figure 2 when the liquid is applied using the first nozzle, and (b) is a cross-sectional view of the object to be coated along line III-III in Figure 2 when the liquid is applied using the second nozzle. [Modes for carrying out the invention]

[0015] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. A coating apparatus 10 in one embodiment will be described with reference to Figure 1. Figure 1 is a schematic diagram of the coating apparatus 10 in one embodiment. The coating apparatus 10 is a device that sprays and coats a coating target object 30 (see Figure 2) placed in the arrangement section 20.

[0016] The coating apparatus 10 includes a platform-shaped placement section 20 on which the object to be coated 30 is placed. In this embodiment, the placement section 20 is platform-shaped, but it may also be a conveyor belt that carries the object to be coated 30 on it, or it may be a device that grips and fixes the object to be coated 30. The object to be coated 30 is placed on the placement section 20 with the surface to be coated with liquid exposed.

[0017] The coating device 10 is equipped with a robot 40. The robot 40 comprises an arm 42 having multiple joints and a base 41 that supports the arm 42. A coating head 43 (end effector) is provided at the tip of the arm 42. The robot 40 is a 6-axis robot capable of moving the coating head 43 in a total of 6 axial directions relative to the placement unit 20: in the height direction (up and down direction on the page of Figure 1), in the horizontal direction perpendicular to the height direction (left and right direction on the page of Figure 1), in the vertical direction perpendicular to both the height direction and the horizontal direction (vertical direction on the page of Figure 1), and in directions of rotation around axes extending in the height direction, horizontal direction, and vertical direction, respectively. The coating head 43 moves to a plurality of predetermined positions relative to the placement unit 20.

[0018] The coating head portion 43 includes a connection portion 44 that connects the arm 42, the first nozzle 45, and the second nozzle 46. The first nozzle 45 and the second nozzle 46 are attached to the connection portion 44 directly or via other members by a mechanical method such as screwing. The axis of the second nozzle 46 is inclined by an angle θ1 with respect to the axis of the first nozzle 45 and faces a different direction. For example, the angle θ1 is between 20° and 90°. In FIG. 1, illustration of pipes for supplying air or liquid to the first nozzle 45 and the second nozzle 46 is omitted. The liquid from the first nozzle 45 and the second nozzle 46 is sprayed in a mist form, and small liquid particles adhere to the coating object 30 for coating.

[0019] The coating head portion 43 includes a protruding portion 50 that protrudes from the connection portion 44. The protruding portion 50 includes the second nozzle 46 such that the tip 48 of the second nozzle 46 exists at the tip of the protruding portion 50. The length L2 of the protruding portion 50 is longer than the distance L1 between the position where the first nozzle 45 is attached to the connection portion 44 and the tip 47 of the first nozzle 45. The length L2 of the protruding portion 50 is the distance between the base where the protruding portion 50 protrudes from the connection portion 44 and the tip 48 of the second nozzle 46. For example, the length L2 is between 50 mm and 250 mm, preferably between 100 mm and 200 mm.

[0020] The thicknesses of the second nozzle 46 and the protruding portion 50 are smaller than the thickness of the first nozzle 45. Therefore, when applying the liquid, the second nozzle 46 and the protruding portion 50 can be inserted into a narrow portion where the first nozzle 45 cannot enter for coating. Thus, the portion where the liquid coating is insufficient can be reduced.

[0021] The second nozzle 46 has a spray angle, which is the angle at which the sprayed liquid spreads, larger than the spray angle of the first nozzle 45. For example, the spray angle β (see FIG. 3(b)) of the second nozzle 46 is between 40° and 160°, and the spray angle α (see FIG. 3(a)) of the first nozzle 45 is smaller than this. Therefore, the liquid sprayed from the second nozzle 46 can be applied over a wider range at once than the liquid sprayed from the first nozzle 45.

[0022] The second nozzle 46 preferably has a liquid spray amount per unit time greater than that of the first nozzle 45. In this case, even if the spray angle of the second nozzle 46 is larger than that of the first nozzle 45, the amount of liquid per unit area sprayed from the second nozzle 46 can be made closer to or greater than the amount of liquid per unit area sprayed from the first nozzle 45. Therefore, the difference in the amount of liquid applied per unit time between the portions coated by the first nozzle 45 and the second nozzle 46 can be reduced, and the variation in the liquid application to the application object 30 can be reduced.

[0023] It is preferable that the size of the liquid particles sprayed from the second nozzle 46 is smaller than the size of the liquid particles sprayed from the first nozzle 45. When the size of the liquid particles sprayed from the second nozzle 46 is small, it is more likely to form a mist compared to the liquid sprayed from the first nozzle 45. Therefore, the liquid sprayed from the second nozzle 46 can be made to fly farther, and it is easier to apply the liquid to a portion having a recessed shape.

[0024] In the present embodiment, the coating head portion 43 is exemplified as having two nozzles, the first nozzle 45 and the second nozzle 46, attached to the connection portion 44, but it is not limited thereto. Three or more nozzles may be attached to the connection portion 44. In that case, the axes of the respective nozzles are offset from each other by a predetermined angle and face different directions.

[0025] The coating apparatus 10 includes a recognition device 60 that acquires the shape of the application object 30 disposed in the placement portion 20 and the position information of the application object 30. The recognition device 60 is attached above the placement portion 20. The information on the shape of the application object 30 acquired by the recognition device 60 is, for example, information on an image photographed by a camera, and the recognition device 60 analyzes the image to recognize the shape. The position information of the application object 30 is the relative distance from a predetermined point of the placement portion 20 to a certain point of the application object 30, and is the respective distances in the height direction, the lateral direction orthogonal to the height direction, and the longitudinal direction orthogonal to both the height direction and the lateral direction from the placement portion 20.

[0026] As means of acquiring information, the recognition device 60 preferably employs non-contact methods such as those using a camera to capture images, lasers, or infrared light. In this embodiment, the recognition device 60 is provided separately from the coating head unit 43 of the robot 40, but it may also be provided on the coating head unit 43 of the robot 40. In this case, the recognition device 60 acquires the shape of the object to be coated 30 and the position information of the object to be coated 30, in association with the position information of the coating head unit 43.

[0027] The coating apparatus 10 includes a processing unit 70 connected to a recognition device 60. The recognition device 60 transmits acquired information to the processing unit 70. The processing unit 70 identifies a coating target object from among a plurality of coating target object shapes pre-recorded in the processing unit 70 that matches the shape of the coating target object 30 acquired from the recognition device 60. Based on the position information of the coating target object 30 transmitted from the recognition device 60, the processing unit 70 corrects the difference between the position information of the coating target object 30 relative to the placement unit 20 and the position information pre-recorded in the processing unit 70. Furthermore, the processing unit 70 is connected to the robot 40 and, based on the identified shape of the coating target object 30, selects a pre-recorded coating program and, based on the corrected position information, issues a movement command to the arm 42 and a spray command to the first nozzle 45 and the second nozzle 46.

[0028] Upon receiving a movement command from the processing unit 70, the arm 42 moves the coating head unit 43 to one of several predetermined positions relative to the placement unit 20. These positions are those that, when the object to be coated 30 is placed in the placement unit 20, direct the tip 47 of the first nozzle 45 and the tip 48 of the second nozzle 46 towards predetermined parts of the object to be coated 30 in order to apply liquid to the object 30. These positions are set separately for each shape of the object to be coated 30.

[0029] The coating head unit 43 sprays liquid while stopping at a plurality of predetermined positions relative to the placement unit 20, or moving to a plurality of positions. Furthermore, the spraying of liquid from the first nozzle 45 and the second nozzle 46 may be continuous or intermittent.

[0030] The timing and order of spraying the liquid from the first nozzle 45 and the second nozzle 46 are set appropriately according to the shape and size of the object to be coated 30. Furthermore, the spraying of the liquid from the first nozzle 45 and the second nozzle 46 may be done simultaneously, individually, or in combination thereof.

[0031] A method for manufacturing a foam by applying a liquid to a coating object 30 will be explained with reference to Figures 2, 3(a), and 3(b). Figure 2 is a rear view of the coating object 30. Figure 3(a) is a cross-sectional view of the coating object 30 along line III-III when applying the liquid using the first nozzle 45, and Figure 3(b) is a cross-sectional view of the coating object 30 along line III-III when applying the liquid using the second nozzle 46. In Figures 2, 3(a), and 3(b), the arrows UD, LR, and FB indicate the vertical, horizontal, and front-to-back directions of the coating object 30, respectively.

[0032] The object to be coated 30 is made of foamed synthetic resin and is used, for example, as a cushion for soft urethane seat cushions, seat backs, headrests, armrests and ottomans for vehicles, office use and home use, as well as a cushion for hard urethane interior parts of instrument panels and door sections for vehicles. In this embodiment, the object to be coated 30 is exemplified as a cushion (seat pad) used for a seat back.

[0033] As shown in Figure 2, the object to be coated 30 has a main body portion 33 extending in the vertical direction, side portions 34, 34 connected to both ends of the main body portion 33 in the left-right direction, and a bent portion 35 extending from above to the rear (towards the front of the page in Figure 2) and facing the main body portion 33 with a space between them. The side portions 34, 34, similar to the bent portion 35, extend from both ends of the main body portion 33 in the left-right direction to the rear and have portions facing the main body portion 33 with a space between them. The side portions 34, 34 are connected at the top to the respective ends of the bent portion 35 in the left-right direction. The side portions 34 bulge forward (towards the back of the page in Figure 2) from the main body portion 33.

[0034] As shown in Figure 3(a), the object to be coated 30 has a surface 31 that includes the front surface of the main body 33 and the outward-facing surfaces of the side 34 and the bent portion 35, and a back surface 32 which is the surface opposite to the surface 31 in the thickness direction. The back surface 32 includes a base surface 36 that forms the rear surface of the main body 33, an upright surface 37 that rises from the base surface 36 toward the rear, and an opposing surface 38 that connects to the upright surface 37 and faces a part of the base surface 36 with a space 39 between them. The back surface 32 of the side 34, 34 and the bent portion 35 is composed of the upright surface 37 and the opposing surface 38. Of the back surface 32 of the object to be coated 30, the upright surface 37, the opposing surface 38, and the base surface 36 of the part facing the opposing surface 38 have a bag-like or recessed shape.

[0035] The statement that the opposing surface 38 faces a portion of the base surface 36 with a space between them is not limited to the opposing surface 38 and the portion of the base surface 36 being parallel to each other. The opposing surface 38 may be inclined at an angle θ2 with a space between it and a portion of the base surface 36. In this case, the angle θ2 of the opposing surface 38 with respect to the portion of the base surface 36 is 0° < θ2 ≤ 90°.

[0036] The object to be coated 30 is attached to the seat frame or seat pan of a vehicle, and then a surface covering is attached to the outer shape of the object to be coated 30. A noise-reducing agent (liquid) is applied to the back surface 32 to prevent noise from being generated by rubbing against the seat frame or seat pan. Suitable noise-reducing agents include, for example, fluororesins such as polytetrafluoroethylene and paraffin-based lubricants such as paraffin wax. In this embodiment, the liquid applied to the object to be coated 30 is a noise-reducing agent, but is not limited to this. Depending on the desired purpose, the liquid may be an adhesive, neutralizing agent, surface treatment agent, rust inhibitor, etc., as appropriate.

[0037] A method for manufacturing a foam is described below. The foam comprises a coating object 30 and a liquid applied to the coating object 30. First, a raw material liquid of foamed synthetic resin is foamed in a mold to form a coating object 30 (sheet pad) made of foamed synthetic resin. The molded coating object 30 is removed from the mold, and a crushing process is performed to crush the closed air bubbles in the coating object 30 and suppress deformation of the coating object 30 due to temperature changes after foam molding by compressing the coating object 30 with rollers or a mold divided into upper and lower halves, or by placing the coating object 30 under reduced pressure. After the crushing process, the compression by rollers, etc. is released, or the reduced pressure is returned to restore the shape of the coating object 30.

[0038] Subsequently, as shown in Figures 3(a) and 3(b), a coating process is performed in which the coating device 10 applies the liquid to the object to be coated 30, thereby obtaining a foamed material in which the liquid has been applied to the object to be coated 30 made of foamed synthetic resin.

[0039] In the coating process, the object to be coated 30 is placed in the placement section 20 with its back surface 32 exposed. A recognition device 60, mounted above the placement section 20 in the height direction, acquires information about the shape of the object to be coated 30 and the position of the object to be coated 30 relative to the placement section 20. The recognition device 60 transmits the acquired information to the processing device 70.

[0040] Based on the shape information of the object to be coated 30 acquired by the recognition device 60, the position information of the object to be coated 30, the corresponding coating program, and the corrected position information, the processing device 70 operates the arm 42 in response to a movement command from the processing device 70, causing the coating head unit 43 to move to one of several predetermined positions relative to the placement unit 20. The first nozzle 45 and the second nozzle 46 spray liquid in response to a spray command from the processing device 70.

[0041] As shown in Figure 3(a), the base surface 36 other than the portion facing the opposing surface 38 is coated by spraying liquid from the first nozzle 45. At this time, the first nozzle 45 sprays liquid towards the base surface 36 other than the portion facing the opposing surface 38 with its tip 47. Since the axis of the second nozzle 46 is oriented in a different direction from the axis of the first nozzle 45, even if the tip 47 of the first nozzle 45 is brought close to the base surface 36, the tip 48 of the second nozzle 46, which is further away from the connection part 44, is less likely to interfere with the object to be coated 30 by the angle θ1 between the tilt of their respective axes. Therefore, the tip 47 of the first nozzle 45 can be brought close to the base surface 36 and the liquid can be sprayed with precision.

[0042] As shown in Figure 3(b), the upright surface 37, the opposing surface 38, and the base surface 36 of the portion facing the opposing surface 38 are coated by spraying liquid from the second nozzle 46. At this time, the second nozzle 46 sprays the liquid with its tip 48 located within the space 39. The diameter of the second nozzle 46 and the projection 50 is sufficiently small relative to the distance between the opposing surface 38 and the base surface 36 of the portion facing the opposing surface 38. Therefore, the tip 48 of the second nozzle 46 and the projection 50 can be positioned within the space 39 when coating.

[0043] At this time, the tip 48 of the second nozzle 46 is directed toward the upright surface 37. Since the tip 48 of the second nozzle 46, which has a larger spray angle than the first nozzle 45, is located within the space 39, the liquid can be simultaneously sprayed and applied to the upright surface 37, the opposing surface 38, and the base surface 36 of the portion facing the opposing surface 38.

[0044] The axis of the second nozzle 46 passes through the center between the opposing surface 38 and the base surface 36 of the portion facing the opposing surface 38. Since the distance from the tip 48 of the second nozzle 46 to the opposing surface 38 and the base surface 36 of the portion facing the opposing surface 38 can be made approximately equal, when liquid is sprayed simultaneously onto the opposing surface 38 and the base surface 36 of the portion facing the opposing surface 38, variations in the application of liquid to the opposing surface 38 and the base surface 36 of the portion facing the opposing surface 38 can be reduced.

[0045] Furthermore, since the tip 48 of the second nozzle 46 is positioned within the space 39 and the liquid is sprayed toward the upright surface 37, where the space 39 has a small portion open to the outside, even if the spray angle from the second nozzle 46 is greater than that of the first nozzle 45, the sprayed liquid is less likely to spread outside the space 39. Therefore, there is less waste of sprayed liquid.

[0046] In the coating process, from the placement of the object to be coated 30 in the placement unit 20 to the completion of the liquid coating operation on the object to be coated 30, everything is performed automatically by the recognition device 60, processing device 70, and robot 40, thus saving labor.

[0047] Although the present invention has been described above based on embodiments, it can be easily inferred that the present invention is not limited in any way and that various improvements and modifications are possible without departing from the spirit of the present invention.

[0048] In the embodiment, the robot 40 was described as a 6-axis robot, but it is not necessarily limited to this. The robot 40 may be a gantry-type loader or a robot with fewer or more movable axes than 6 axes. Even if the robot 40 has fewer movable axes than 6 axes, since the axis of the second nozzle 46 is oriented in a different direction from the axis of the first nozzle 45 by an angle θ1, the other nozzle can coat parts of the object 30 that cannot be coated by either the first nozzle 45 or the second nozzle 46 alone.

[0049] In this embodiment, the case described is one in which the placement unit 20 does not move, and the coating head unit 43 moves to a plurality of predetermined positions relative to the placement unit 20. However, the embodiment is not necessarily limited to this. Within the range in which the recognition device 60 can acquire information and within the range in which the coating head unit 43 can move, the placement unit 20 may grasp the object to be coated 30 and move the object to be coated 30 together with the movement of the placement unit 20. In this case, both the placement unit 20 and the coating head unit 43 may move, or only the placement unit 20 may move. In this case, the plurality of predetermined positions relative to the placement unit 20 are positions in which, regardless of whether the placement unit 20 moves, the relationship between the placement unit 20 and the distance in the height, width, and length directions relative to the placement unit 20 remains the same as when the placement unit 20 does not move. Regardless of which position the placement unit 20 is in after moving, the relative positional relationship between the placement unit 20 and the plurality of predetermined positions to which the coating head unit 43 moves remains unchanged. Therefore, the tip 47 of the first nozzle 45 and the tip 48 of the second nozzle 46 can be positioned at the same distance from the placement section 20 and oriented in the same direction.

[0050] In the embodiment, the case in which the second nozzle 46 is part of the protruding portion 50 has been described, but it is not necessarily limited to this. It is of course possible to make the entire second nozzle 46 a protruding portion 50 that extends from the connecting portion 44, such that the tip 48 of the second nozzle 46 is located at the tip of the protruding portion 50.

[0051] In this embodiment, the case in which the opposing surface 38 is tilted by an angle θ2 as shown in Figure 3(a) has been described, but it is not necessarily limited to this. As long as the tip of the opposing surface 38 opposite to the side connected to the upright surface 37 is spaced apart from the base surface 36, the distance between the opposing surface 38 and the base surface 36 may increase as you move from the tip of the opposing surface 38 opposite to the side connected to the upright surface 37 toward the upright surface 37. In this case, the opposing surface 38 is tilted by an angle θ3 with respect to the base surface 36 toward the upright surface 37 from the tip of the opposing surface 38 opposite to the side connected to the upright surface 37. At this time, the opposing surface 38 is tilted in the opposite direction to when the opposing surface 38 is tilted by an angle θ2. For example, the angle θ3 is 0° < θ3 ≤ 10°.

[0052] The opposing surface 38 may have a portion that is recessed to the rear or a portion that bulges forward, as long as the opposing surface 38 is spaced apart from the base surface 36. Furthermore, the opposing surface 38 may have a shape that bends so that its tip moves closer to or away from the base surface 36. In any case, among the recessed portion, bulging portion, and bent portion of the opposing surface 38, the angle with respect to the base surface 36 of the portion that slopes from the upright surface 37 toward the tip of the opposing surface 38 toward the base surface 36 is preferably 10° or less. [Explanation of symbols]

[0053] 10 Coating device 20 Placement section 30. Objects to be coated 32 Back side 36 Base 37 Erection surface 38 Opposing surfaces 39 Space 43. Dispensing head section 44 Connection part 45. Nozzle No. 1 46. ​​Second Nozzle 50 Protrusion

Claims

1. A coating apparatus for applying liquid to an object to be coated, The arrangement section where the object to be coated is placed, The system includes a coating head that moves to a plurality of predetermined positions relative to the aforementioned arrangement section, The coating head unit includes a first nozzle for spraying the liquid, The connection portion on which the first nozzle is provided, The protruding portion extending from the aforementioned connecting portion, The protruding portion is provided with a second nozzle for spraying the liquid, The axes of the second nozzle and the protrusion and the axis of the first nozzle are inclined in directions away from each other. The coating head unit is a coating device that moves the first nozzle and the second nozzle so that the liquid particles sprayed by the first nozzle and the second nozzle adhere to the object to be coated.

2. The coating apparatus according to claim 1, wherein the length of the protrusion is longer than the distance between the position where the first nozzle is attached to the connection and the tip of the first nozzle.

3. The coating apparatus according to claim 1 or 2, wherein the second nozzle and the protruding portion are thinner than the first nozzle.

4. The coating apparatus according to any one of claims 1 to 3, wherein the particle size of the liquid sprayed from the second nozzle is smaller than the particle size of the liquid sprayed from the first nozzle.

5. A method for producing a foam by applying a liquid to an object made of foamed synthetic resin, The invention provides a coating step of applying the liquid to the object to be coated using the coating apparatus described in any one of claims 1 to 4, The object to be coated comprises a surface and a back surface opposite to the surface in the thickness direction, The aforementioned back surface has a base surface, an upright surface rising from the base surface, and a facing surface that connects to the upright surface, provides a space, and faces a part of the base surface. In the coating step, the first nozzle sprays the liquid at least onto the base surface. The second nozzle is a method for manufacturing a foam, in which the liquid is sprayed onto at least the upright surface and the opposing surface.

6. The method for manufacturing a foam according to claim 5, in the coating step, when spraying the liquid onto the upright surface and the opposing surface, the tip of the second nozzle is pointed toward the upright surface and positioned within the space.

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