JP2019130449A - Coating applicator and application method - Google Patents

Abstract

To rotate a nozzle and apply a liquid to a coated object.SOLUTION: A coating applicator 1 applies a liquid 30 to a coated object 20 and includes: nozzles 13, 113 for discharging the liquid; a liquid supply source 2 which supplies the liquid to the nozzles; a liquid valve 69 which is provided at a liquid path 31 between the nozzles and the liquid supply source and can move to an opening position where the liquid valve 69 allows discharge of the liquid from the nozzles and a closed position where the liquid valve 69 stops the discharge of the liquid from the nozzles; and nozzle rotation means 62, 63 which rotate the nozzles.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coating apparatus and a coating method that apply a liquid to an object by rotating a nozzle.

  Conventionally, in order to apply a liquid such as chocolate to the inner surface of an ice cream cone, an air spray nozzle that atomizes the liquid with compressed air is used. In the case of an air spray nozzle, the compressed air for atomizing the liquid inhibits the liquid from entering the inner side of the cone, so that it is difficult to uniformly apply the liquid to the inner surface of the cone. Since the inner surface of the cone has a conical shape, the area to which the liquid is applied is small on the back side of the cone, and the area to which the liquid is applied is large on the front side (opening side) of the cone. In the case of an air spray nozzle, it is difficult to control the spray pattern so that the amount of liquid applied is different between the back side and the near side of the cone. Therefore, in the air spray nozzle, when the application amount of the liquid necessary for the front side of the cone is adjusted, the application amount of the liquid on the back side of the cone becomes too large. In contrast, in the case of an airless spray nozzle that does not use compressed air for atomizing the liquid, the coating amount can be adjusted on the back side and the near side of the cone.

JP-A-5-316931

  However, in the airless spray application, the liquid is applied to the inner surface of the cone while fixing the airless spray nozzle and rotating the cone. Therefore, in the case of an airless spray nozzle, equipment for rotating the cone is required (Patent Document 1). A large amount of money is required to install the equipment for rotating the cone. In addition, it may be difficult to add equipment for rotating a cone to existing ice cream manufacturing equipment.

  Therefore, the present invention provides a coating apparatus that applies a liquid to an object to be coated by rotating a nozzle.

In order to solve the above-described problem, an application apparatus for applying a liquid to an object to be coated according to an embodiment of the present invention includes:
A nozzle for discharging the liquid;
A liquid supply source for supplying the liquid to the nozzle;
Liquid provided in a liquid path between the nozzle and the liquid supply source, and movable to an open position that allows the liquid to be discharged from the nozzle and a closed position to stop the discharge of the liquid from the nozzle A valve,
Nozzle rotating means for rotating the nozzle;
It is characterized by providing.

  According to the present invention, a liquid can be applied to an object to be coated by rotating a nozzle.

The figure which shows a coating device. The figure which shows the circulation path of a heat medium. The perspective view of an application | coating valve | bulb. The front view of an application | coating valve | bulb. Sectional drawing of the application | coating valve | bulb taken along line VV of FIG. Sectional drawing of the application | coating valve | bulb taken along line VI-VI of FIG. Sectional drawing of the application | coating valve | bulb taken along line VII-VII of FIG. The figure which shows the liquid path | route in an application | coating valve | bulb. The perspective view of a rotating shaft. The figure which shows the nozzle attached to the adapter. FIG. 6 is a partial cross-sectional view of a coating valve of Example 2.

  Hereinafter, the present invention will be described based on embodiments with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in the following embodiments are not intended to limit the scope of the present invention only to those unless otherwise specified. Absent.

(Applicator)
FIG. 1 is a view showing a coating apparatus 1. The coating apparatus 1 applies the liquid 30 to the inner surface 20a of the article 20 to be coated, such as a container, a cylindrical container, a conical container, or an ice cream cone. The coating apparatus 1 includes a tank (liquid supply source) 2, a pressure pump (pressure means) 4, a heater 5, a filter 6, a pressure regulator 7, a coating valve 8, a circulation valve 9, a heater controller 11, a valve opening / closing controller 12, and A motor rotation controller 14 is included. The tank 2 is provided with a jacket 3 for circulating a heat medium such as hot water. A material such as melted chocolate stored in the tank 2 is held as a liquid 30 by heat from the jacket 3. The liquid 30 includes a melt. Inside the pressurizing pump 4, a plunger (not shown) and a pneumatic piston (not shown) are provided so as to be able to reciprocate. When the pneumatic piston is operated by the compressed air, the pressurizing pump 4 sucks the liquid 30 from the tank 2. The pressurizing pump 4 discharges the liquid 30 to the heater 5 at a pressure obtained by multiplying the value of the sectional area of the pneumatic piston (not shown) with respect to the sectional area of the plunger (not shown) by the pressure of the compressed air. The pressurizing means for pressurizing the liquid supplied from the tank 2 is not limited to the pressurizing pump 4 and may be a pressurizing tank (pressurizing pot).

  The heater 5 adjusts the temperature of the liquid 30 by heating the liquid 30. The heater 5 is provided with a temperature sensor 10 that detects the temperature of the liquid 30. The heater controller 11 adjusts the temperature of the liquid 30 to the application temperature based on the temperature detected by the temperature sensor 10. The liquid 30 heated by the heater 5 flows to the filter 6. The filter 6 filters aggregates in the liquid 30. The liquid 30 filtered by the filter 6 flows to the pressure regulator 7. The pressure regulator 7 reduces the pressure of the liquid 30 and adjusts it to the application pressure. The liquid 30 regulated by the pressure regulator 7 flows to the application valve 8. In the present embodiment, the coating apparatus 1 is provided with four coating valves 8. The number of application valves 8 is not limited to four, and only one application valve 8 may be provided as necessary, or a plurality of application valves 8 such as three, five, etc. May be provided.

  The application valve 8 is provided with a nozzle 13 that discharges the liquid 30 to the article 20. In a state where the liquid 30 is not discharged from the nozzle 13 to the article 20, the liquid 30 passes through the main body 60 of the application valve 8, the return passage 32, and the circulation valve 9 and is returned to the tank 2. The circulation valve 9 has a needle valve that adjusts the flow rate of the liquid 30 flowing from the tank 2 to the application valve 8. The liquid 30 heats the circulation path 33 by circulating through the circulation path 33 including the tank 2, the pressure pump 4, the heater 5, the filter 6, the pressure regulator 7, the application valve 8, and the circulation valve 9.

  When the liquid 30 is discharged from the nozzle 13 to the workpiece 20, the valve opening / closing controller 12 controls the compressed air supplied to the liquid valve mechanism 61 (FIG. 5) described later. The valve opening / closing controller 12 controls the start and stop of discharge of the liquid 30 from the nozzle 13 by moving the liquid valve 69 (FIG. 5) in the liquid valve mechanism 61 by compressed air. The nozzle 13 attached to the tip of the application valve 8 is rotated at a predetermined rotational speed by a motor 63 (FIG. 3) controlled by a motor rotation controller (rotation control means) 14. The predetermined rotation speed is preferably 60 to 400 rpm. In the present embodiment, the motor 63 rotates at 200 rpm.

  FIG. 2 is a diagram showing a circulation path 50 of the heat medium 40. In order to keep the temperature of the application valve 8 more constant, a circulation path 50 for circulating the heat medium 40 in the main body 60 of the application valve 8 is provided. The heat medium 40 is accommodated in the heat medium tank 41. The heat medium tank 41 is surrounded by a jacket 44 through which warm water passes and is heated with warm water. The pump 45 sucks the heat medium 40 from the heat medium tank 41 and pumps it to the application valve 8. The heat medium 40 exiting from the application valve 8 is returned to the heat medium tank 41.

(Application valve)
FIG. 3 is a perspective view of the application valve 8. The application valve 8 includes a main body 60, a liquid valve mechanism 61, a nozzle 13 (FIG. 4), a rotating shaft 62, and a motor 63. The rotating shaft 62 and the motor 63 constitute nozzle rotating means for rotating the nozzle 13. FIG. 4 is a front view of the application valve 8. The main body 60 is provided with a liquid inlet 64 that receives the liquid 30 regulated by the pressure regulator 7 and a liquid outlet 65 that returns the liquid 30 to the tank 2. FIG. 5 is a cross-sectional view of the application valve 8 taken along line VV in FIG. 6 is a cross-sectional view of the application valve 8 taken along line VI-VI in FIG. FIG. 7 is a cross-sectional view of the application valve 8 taken along line VII-VII in FIG. As shown in FIG. 6, the liquid inlet 64 communicates with a first liquid passage 66 provided in the main body 60. As shown in FIG. 7, the first liquid passage 66 communicates with a liquid chamber 67 provided in the main body 60. The liquid outlet 65 communicates with a second liquid passage 68 (FIG. 7) provided in the main body 60. As shown in FIG. 7, the main body 60 is provided with a heat medium inlet 42 for receiving the heat medium 40 from the heat medium tank 41 and a heat medium outlet 43 for discharging the heat medium 40 from the main body 60 to the heat medium tank 41 (FIG. 2). It has been. FIG. 8 is a view showing the liquid path 31 in the application valve 8. As shown in FIG. 7, the second liquid passage 68 communicates with the liquid chamber 67. The liquid inlet 64, the first liquid passage 66, the liquid chamber 67, the second liquid passage 68, and the liquid outlet 65 form the liquid path 31 in the main body 60, as shown in FIG.

  As shown in FIGS. 5 and 7, a liquid valve 69 is disposed in the liquid chamber 67 so as to be reciprocally movable. A valve body 70 is provided at one end of the liquid valve 69, and a piston 71 is provided at the other end. The piston 71 is disposed in the piston chamber 72. The liquid valve 69 can be moved between an open position and a closed position by compressed air controlled by the valve opening / closing controller 12. When the valve opening / closing controller 12 supplies compressed air from the air inlet 73 provided in the liquid valve mechanism 61 to the piston chamber 72, the liquid valve 69 resists the urging force of the spring 74 in the left direction in FIGS. Move to. When the liquid valve 69 moves to the open position, the valve body 70 moves away from the valve seat 75 and allows the liquid 30 to be discharged from the nozzle 13. That is, when the valve body 70 is separated from the valve seat 75, the liquid 30 in the liquid chamber 67 is discharged to the liquid discharge chamber 76. The liquid is discharged from the nozzle 13 through an annular groove 87, a plurality of liquid holes 88, and a shaft hole 89 provided in the rotary shaft 62 described later. When the compressed air in the piston chamber 72 is discharged from the air outlet 77 provided in the liquid valve mechanism 61, the liquid valve 69 moves to the right in FIGS. The body 70 closes the valve seat 75. When the liquid valve 69 moves to the closed position, the valve body 70 closes the valve seat 75 and stops the discharge of the liquid 30 from the nozzle 13. The valve opening / closing controller 12 functions as a liquid discharge control unit that controls movement of the liquid valve 69 between an open position and a closed position.

(Axis of rotation)
As shown in FIG. 5, the rotating shaft 62 is rotatably held by sliding bearings 78 and 79 provided on the main body 60. A rotary seal 80 is provided so that the liquid 30 does not leak from between the main body 60 and the rotary shaft 62. One end 62 a of the rotating shaft 62 is connected to the rotating shaft 81 of the motor 63 by a coupling 82. An adapter 83 is attached to the other end portion 62 b of the rotating shaft 62. The nozzle 13 is fixed to the adapter 83 with a nut 84. The motor 63 rotates the rotating shaft 62 and the nozzle 13.

  FIG. 9 is a perspective view of the rotating shaft 62. A key groove 86 to which a key 85 for connecting to the coupling 82 is attached is provided at one end 62 a of the rotating shaft 62. An annular groove 87 is provided at the center of the rotating shaft 62. The annular groove 87 communicates with a liquid discharge chamber 76 (FIG. 5) provided in the main body 60. A plurality of liquid holes 88 are formed in the annular groove 87. The plurality of liquid holes 88 communicate with a shaft hole 89 that opens to the other end portion 62 b of the rotating shaft 62. The shaft hole 89 communicates with the nozzle 13 through a through hole 90 provided in the adapter 83 (FIG. 5).

((nozzle))
FIG. 10 is a view showing the nozzle 13 attached to the adapter 83. The nozzle 13 is fixed to the adapter 83 by a nut 84. The nozzle 13 includes a nozzle tip 91 and a nozzle holder 92. The nozzle 13 is an airless spray nozzle that does not use air for atomizing the liquid 30. The nozzle holder 92 is provided with a through hole 93 that communicates with the through hole 90 of the adapter 83. A concave portion (nozzle mounting portion) 100 into which the nozzle tip 91 is fitted is provided at the tip portion of the nozzle holder 92. The recess 100 is provided with an inclined surface 94 on which the nozzle tip 91 is mounted. A normal line 98 of the inclined surface 94 is inclined with respect to the rotation center line 97 of the rotation shaft 62. The inclined surface 94 is inclined with respect to the mounting surface 102 of the nozzle holder 92 mounted on the adapter 83. The nozzle tip 91 is brazed to the nozzle holder 92.

  The nozzle chip 91 is provided with an orifice 95 for discharging the liquid 30. In the present embodiment, the opening 96 of the orifice 95 is disposed on the rotation center line 97 of the rotation shaft 62. The center line 99 of the spray pattern of the liquid 30 discharged from the orifice 95 is inclined with respect to the rotation center line 97 of the rotation shaft 62. In the present embodiment, the center line 99 of the spray pattern is parallel to the normal line 98 of the inclined surface 94, but is not limited thereto. As long as the center line 99 of the spray pattern is inclined with respect to the rotation center line 97 of the rotation shaft 62, it is not always necessary to be parallel to the normal line 98 of the inclined surface 94. By changing the inclination angle of the inclined surface 94 of the nozzle holder 92, the application position of the liquid 30 on the article 20 can be adjusted. The opening 96 is not necessarily disposed on the rotation center line 97 of the rotation shaft 62, and the opening 96 may be separated from the rotation center line 97. When the opening 96 is away from the rotation center line 97, the application position of the liquid 30 on the object to be coated is changed by changing the distance between the opening 96 and the rotation center line 97 and the inclination angle of the inclined surface 94 of the nozzle holder 92. Can be adjusted.

  In the present embodiment, the inclination angle of the inclined surface 94 is 15 ° with respect to the horizontal. The spray pattern of the liquid 30 discharged from the opening 96 of the orifice 95 has a flat fan shape in the range of 0 ° to 30 ° with respect to the rotation center line 97. The inclination angle of the normal line 98 of the inclined surface 94 with respect to the rotation center line 97 may be set to an arbitrary angle in the range from 0 ° to 90 °. Also, the opening angle of the spray pattern may be set to an arbitrary angle. If the spray pattern is in the form of a mist, the liquid 30 scatters and the efficiency of application to the article 20 decreases. Therefore, the spray pattern is preferably a liquid film. However, the spray pattern is not necessarily limited to a flat fan-shaped liquid film, and may be, for example, a hollow cone shape as necessary.

  The application distribution of the liquid 30 can be adjusted by changing the shape of the opening 96 of the orifice 95 of the nozzle 13. Such a nozzle is called a control pattern nozzle. By using the control pattern nozzle, the coating amount on one side of the coating width can be increased, or the coating amount at the central portion of the coating width can be increased.

(Application method)
An application method for applying the liquid 30 to the inner surface 20a of the conical object 20 will be described. The position of the object to be coated 20 is fixed with respect to the coating valve 8 by the holding mechanism 101. The object 20 is preferably positioned so that the center line of the conical object 20 coincides with the rotation center line 97 of the nozzle 13. The nozzle 13 is always rotated by the motor 63 during the application work process. When the valve opening / closing controller 12 opens and closes the application valve 8, the liquid 30 is applied from the nozzle 13 to the inner surface 20 a of the workpiece 20. The application amount of the liquid 30 applied from the nozzle 13 to the inner surface 20 a of the workpiece 20 is controlled by adjusting the pressure of the liquid 30 by the pressure regulator 7 according to the type of the nozzle 13 and the viscosity of the liquid 30. The application width of the liquid 30 applied to the inner surface 20a of the object to be coated 20 is controlled by adjusting the pressure of the liquid 30 and the distance between the nozzle 13 and the object to be coated 20 according to the type of the nozzle 13 and the viscosity of the liquid 30. The

  The liquid 30 is discharged from the nozzle 13 in a flat fan-shaped liquid film-like airless spray pattern. The airless spray pattern is offset to one side of the inner surface 20a of the coating object 20 when the conical coating object 20 is viewed in cross section. The nozzle 13 is rotated by the motor 63 in the direction indicated by the arrow R in FIG. The object to be coated 20 is held by the holding mechanism 101 so as not to rotate. As the liquid 30 is discharged from the nozzle 13 in a fan-shaped liquid film-like airless spray pattern toward the generatrix 20b of the inner surface 20a of the conical object 20, the nozzle 13 is rotated. The time required for the flat fan-shaped liquid film-like airless spray pattern of the liquid 30 to make one round of the inner surface 20a of the workpiece 20 is 0.3 seconds. In consideration of the delay time of opening and closing of the liquid valve 69 and the stabilization time of the spray pattern with respect to the opening / closing instruction signal from the valve opening / closing controller 12, in this embodiment, the application time for discharging the liquid 30 from the nozzle 13 is about 0.35. Set to seconds. The application time of about 0.35 seconds is longer than 0.3 seconds for the nozzle 13 to make one rotation. Thereby, the liquid 30 can be apply | coated over the circumference | surroundings of the inner surface 20a of the conical object 20 to be coated.

  As described above, in the present embodiment, the application amount of the liquid 30 is controlled by adjusting the pressure of the liquid 30 while keeping the application time constant. If the application amount of the liquid 30 is controlled by adjusting the application time while keeping the pressure of the liquid 30 constant, the application start part and the application end part of the liquid 30 overlap, or the application start part and the application end. There may be a gap between the parts. This causes unevenness in the application distribution of the liquid 30. Therefore, in this embodiment, the application amount is controlled by adjusting the pressure of the liquid 30 while keeping the application time constant at a predetermined value. Further, since the application amount and the application width change according to the change in the viscosity of the liquid 30, the viscosity may be managed by the difference in the lot of the liquid 30, or the temperature of the liquid 30 may be controlled.

  According to the present embodiment, the nozzle 13 rotates at an arbitrary rotation speed and an arbitrary rotation direction, and the liquid 30 can be applied to the inner surface 20a of the object to be coated 20 without rotating the object to be coated 20. By replacing the nozzle 13, the liquid can be applied to the object to be coated with an arbitrary application width and an arbitrary application amount. In the existing application equipment for applying a liquid to an object to be coated, it is possible to eliminate the need for modification for rotating the object to be coated. Since the liquid 30 can be applied to the object to be coated 20 from the airless spray nozzle 13 in a flat fan-shaped liquid film spray pattern, the coating efficiency is improved and the amount of the liquid 30 to be used can be reduced. it can. By using the nozzle (angled nozzle) 13 in which the orifice 95 is inclined with respect to the rotation center line 97, the mounting operation of the nozzle 13 can be facilitated.

  The coating apparatus 1 according to the present embodiment applies the liquid 30 to the inner surface 20a of the article 20 such as a container, a cylindrical container, a conical container, or an ice cream cone. However, the present invention is not limited to this, and can also be applied to a case where a liquid is applied on a material contained in a container. For example, when the inclination angle of the normal line 98 of the inclined surface 94 with respect to the rotation center line 97 is 0 °, the liquid can be applied on the material contained in the container having an upper opening. In addition, when the inclination angle of the normal line 98 of the inclined surface 94 to the rotation center line 97 is 90 °, the liquid can be applied to the inner surface of the cylinder or the cylindrical container.

  According to the present embodiment, the liquid 30 can be applied to the article 20 by rotating the nozzle 13.

  Example 2 will be described below. In the second embodiment, the same structure as that of the first embodiment is denoted by the same reference numeral, and the description thereof is omitted. The second embodiment is different from the first embodiment in that an inclined surface 194 is provided on an adapter 183 for attaching the nozzle 113 to the rotating shaft 62. Since the other structure of Example 2 is the same as that of Example 1, description is abbreviate | omitted.

  FIG. 11 is a partial cross-sectional view of the application valve 8 of the second embodiment. An adapter 183 is attached to the other end portion 62 b of the rotating shaft 62. The adapter 183 is provided with an inclined surface 194 to which the nozzle 113 is attached. The normal line 198 of the inclined surface 194 is inclined with respect to the rotation center line 97 of the rotation shaft 62. In the second embodiment, the angle of the normal line 198 of the inclined surface 194 with respect to the rotation center line 97 is set within a range of 0 ° to 20 °. The nozzle 113 is fixed to the adapter 183 with a nut 84. The nozzle 113 is an airless spray nozzle that does not use air for atomizing the liquid 30. The nozzle 113 is attached to the inclined surface 194 to be an angled nozzle in which the orifice 195 that discharges the liquid 30 is inclined with respect to the rotation center line 97. The angle of the inclined surface 194, the pressure of the liquid 30, the nozzle 113 and the object to be coated are applied so that a flat fan-shaped liquid film spray pattern discharged from the nozzle 113 is applied to an appropriate position on the inner surface 20a of the object 20 to be coated. The distance of the coating material 20 is set.

  According to the second embodiment, the same effect as the first embodiment is obtained. Moreover, the normal nozzle 113 can be used by using the adapter 183 provided with the inclined surface 194. The nozzle 113 may have an inclined surface on which the nozzle tip is mounted as in the first embodiment.

  According to the present embodiment, the liquid 30 can be applied to the article 20 by rotating the nozzle 113.

  The present invention is not limited to the above embodiments, and can be implemented in various other forms without departing from the features thereof. For this reason, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is shown by the scope of claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Coating device 2 ... Tank (liquid supply source)
13, 113 ... Nozzle 20 ... Coating object 30 ... Liquid 31 ... Liquid path 62 ... Rotating shaft (nozzle rotating means)
63 ... Motor (nozzle rotating means)
69 ... Liquid valve

Claims (24)

An application device for applying a liquid to an object to be coated,
A nozzle for discharging the liquid;
A liquid supply source for supplying the liquid to the nozzle;
Liquid provided in a liquid path between the nozzle and the liquid supply source, and movable to an open position that allows the liquid to be discharged from the nozzle and a closed position to stop the discharge of the liquid from the nozzle A valve,
Nozzle rotating means for rotating the nozzle;
A coating apparatus comprising:   The coating apparatus according to claim 1, further comprising a holding mechanism that holds the coating object so that the coating object does not rotate.   The coating apparatus according to claim 1, wherein the nozzle includes a nozzle tip in which an orifice that discharges the liquid is formed, and a nozzle holder that holds the nozzle tip. The nozzle holder has an inclined surface on which the nozzle tip is mounted,
The coating apparatus according to claim 3, wherein a normal line of the inclined surface is inclined with respect to a rotation center line of the nozzle.   The said nozzle rotation means is provided with the rotating shaft to which the said nozzle is attached, and the motor which rotates the said rotating shaft, The coating device as described in any one of the Claims 1 thru | or 4 characterized by the above-mentioned.   The coating apparatus according to claim 5, further comprising an adapter for attaching the nozzle to the rotating shaft. The adapter has an inclined surface on which the nozzle is mounted,
The coating apparatus according to claim 6, wherein a normal line of the inclined surface is inclined with respect to a rotation center line of the rotation shaft.   The coating apparatus according to claim 1, wherein the nozzle discharges the liquid in a flat fan-shaped liquid film airless spray pattern.   The coating apparatus according to claim 1, further comprising a pressurizing unit that pressurizes the liquid supplied from the liquid supply source.   The coating apparatus according to claim 9, wherein the pressurizing unit is a pressurizing pump or a pressurizing tank. Liquid ejection control means for controlling movement of the liquid valve between the open position and the closed position;
Rotation control means for controlling rotation of the nozzle rotation means;
The coating apparatus according to claim 1, further comprising:   The coating apparatus according to claim 1, wherein the liquid is a melted chocolate.   The coating apparatus according to claim 1, wherein the object to be coated is a cone for ice cream.   The said ice cream cone is arrange | positioned with respect to the said coating device so that the centerline of the said icecream cone may correspond to the rotation centerline of the said nozzle, The coating device of Claim 13 characterized by the above-mentioned. A method of applying a liquid to an object,
Holding the workpiece against the nozzle,
Supplying the liquid from a source to the nozzle;
A method of rotating the nozzle while discharging the liquid from the nozzle in a fan-shaped liquid film airless spray pattern toward the object to be coated.   The method according to claim 15, wherein an application time for discharging the liquid from the nozzle is longer than a time for which the nozzle makes one revolution.   17. The holding includes disposing the coating object with respect to the nozzle so that a center line of the coating object coincides with a rotation center line of the nozzle. The method described in 1.   The method of claim 17, wherein a center line of the airless spray pattern is inclined with respect to the rotation center line of the nozzle.   The method according to any one of claims 15 to 18, wherein the holding includes holding the article to be rotated. A method of applying chocolate to an ice cream cone,
Holding the ice cream cone against the nozzle,
Supplying the melted chocolate from the source to the nozzle;
A method of rotating the nozzle while discharging the melted chocolate from the nozzle toward the inner surface of the ice cream cone.   21. The method according to claim 20, wherein an application time for discharging the melted chocolate from the nozzle is longer than a time for the nozzle to make one rotation.   21. The holding includes disposing the ice cream cone with respect to the nozzle such that a center line of the ice cream cone coincides with a rotation center line of the nozzle. Or the method of 21. The melted chocolate is discharged in a flat fan-shaped liquid film-like airless spray pattern from the nozzle toward the bus on the inner surface of the ice cream cone,
The method of claim 22, wherein a center line of the airless spray pattern is inclined with respect to the rotation center line of the nozzle.   24. A method according to any one of claims 20 to 23, wherein the holding comprises holding the ice cream cone against rotation.