JP2015182043A - Fluid coating mechanism, fluid coating method and fluid coating applicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress entrainment of bubbles into viscous fluid generated when a residual amount of the viscous fluid becomes small, and to suppress inclusion of bubbles from a discharge port.SOLUTION: A dispenser 10 includes a syringe 1, a needle valve 2, and a float 5. A shaft of the needle valve 2 penetrates a center part of the float 5, and the side surface along a vertical direction of the float 5 is adjacent to the inner surface of the syringe 1. The float 5 is always pressurized by compressed air in the state where the needle valve 2 is closed, and the needle valve 2 is lifted as long as a specified time, to thereby drop viscous fluid 4.

Description

  The present invention relates to a fluid application mechanism and a fluid application method for applying a viscous fluid to an application target, and a fluid application apparatus including the fluid application mechanism.

  2. Description of the Related Art Conventionally, in electronic component mounting processes and the like, dispensers that apply a viscous fluid such as resin to an application target are widely used. Patent Document 1 discloses an air-type dispenser that pressurizes a viscous fluid stored in a syringe and pushes it out from a nozzle.

  On the other hand, as a conventional dispenser, in addition to such an air-type dispenser, a needle valve type metering discharge valve type dispenser is known. This dispenser has a larger discharge amount of viscous fluid than a conventional volumetric type dispenser. For this reason, when a product having a relatively large amount of application of viscous fluid is to be applied, it is preferable to use a needle valve type fixed discharge valve type dispenser.

Japanese Patent Laying-Open No. 2001-162206 (released on June 19, 2001)

  However, the conventional technology as described above has a problem in that no consideration is given to the problem of entrainment of bubbles generated when the remaining amount of viscous fluid decreases and the inclusion of bubbles from the discharge port. there were.

  Here, the entrainment of bubbles will be described with reference to FIG. 4 using a conventional needle valve type fixed discharge valve type dispenser as an example. FIG. 4 is a cross-sectional view showing a schematic configuration of a dispenser 100 which is an example of a conventional needle valve type fixed discharge valve type dispenser.

  As shown in the figure, the dispenser 100 includes a syringe 101 and a needle valve 102. A viscous fluid 104 is accommodated in the syringe 101. A discharge port 103 through which the viscous fluid 104 is discharged is formed at the bottom of the syringe 101. As shown in FIG. 4A, the discharge of the viscous fluid 104 is stopped by closing the discharge port 103 at the tip of the needle valve 102. On the other hand, as shown in FIG. 4B, the viscous fluid 104 is discharged by moving the tip of the needle valve 102 away from the discharge port 103.

  An experiment was conducted in which a phosphor resin was accommodated in the syringe 101 of the dispenser 100 and the phosphor resin was dropped using the dispenser 100. As a result, as shown in FIG. 4C, bubbles were entrained in the dropped resin in a state where the remaining amount of the phosphor resin in the syringe 101 was small (defect occurrence rate 80%). When such entrainment occurs, the phosphor resin cannot be used to the end. This is considered to be because the compressed air was dissolved in the resin at a portion close to the contact surface SUF of the compressed air with respect to the phosphor resin in the syringe 101.

  Further, in the dispenser 100, since the compressed air is in direct contact with the resin at the contact surface SUF, the pressure by the compressed air may not be uniformly transmitted to the resin, and bubbles may be contained from the discharge port 103.

  On the other hand, since the air-type dispenser of Patent Document 1 is driven only when the viscous fluid is dropped, there is no room for air bubble entrainment to occur. That is, in the dispenser described in Patent Document 1, entrainment of bubbles does not become a problem.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a fluid application mechanism that can suppress the entrainment of bubbles in a viscous fluid and the inclusion of bubbles from a discharge port. .

  In order to solve the above problems, a fluid application mechanism according to an aspect of the present invention is a fluid application mechanism that applies a viscous fluid to an application target, and a container that contains the viscous fluid; The discharge port formed at the bottom is closed by the tip of the needle-like valve, and the discharge of the viscous fluid is stopped, and the discharge of the viscous fluid is performed by moving the tip away from the discharge port. A needle valve that is a valve mechanism, and a float that contacts the viscous fluid and moves inside the container. The shaft of the needle valve passes through the center of the float and extends in the vertical direction of the float. The side surface along is close to the inner surface of the container.

  According to one embodiment of the present invention, there is an effect of suppressing bubble entrainment in a viscous fluid and inclusion of bubbles from a discharge port.

It is a figure which shows schematic structure of the fluid application | coating mechanism which concerns on Embodiment 1 of this invention, (a) shows a state when a needle valve is closed, (b) shows a state when the needle valve is opened. (C) shows a state when the remaining amount of viscous fluid is small, (d) is a top view of the float, and (e) is a side view of the float. It is a figure which shows schematic structure of the fluid application | coating mechanism which concerns on Embodiment 2 of this invention, (a) shows the state when a needle valve is closed, (b) shows the state when the needle valve is opened. (C) shows a state when the remaining amount of viscous fluid is small, (d) is a top view of the float, and (e) is a side view of the float. It is a figure which shows schematic structure of the fluid application apparatus which concerns on Embodiment 3 of this invention. It is a figure which shows the general | schematic structure of the conventional needle valve type | formula fixed quantity discharge valve type dispenser, (a) shows the state when the needle valve is closed, (b) shows the state when the needle valve is opened. (C) shows a state when the remaining amount of the viscous fluid is small.

  Embodiments of the present invention will be described below with reference to FIGS. Descriptions of configurations other than those described in the following specific embodiments may be omitted as necessary, but are the same as those configurations when described in other embodiments. For convenience of explanation, members having the same functions as those shown in each embodiment are given the same reference numerals, and the explanation thereof is omitted as appropriate. Further, the shape of the configuration described in each drawing and the dimensions such as length, size, and width do not reflect the actual shape and dimensions, but are changed as appropriate for clarity and simplification of the drawings. doing.

  In a molding process of a product having a relatively large amount of resin applied, it is preferable to use a needle valve type fixed discharge valve type dispenser. This is because the conventional volumetric type dispenser has a small discharge amount. Therefore, hereinafter, an embodiment of the present invention will be described taking a needle valve type fixed discharge valve type dispenser as an example.

Embodiment 1
FIG. 1 is a diagram showing a schematic configuration of a dispenser (fluid application mechanism) 10 according to Embodiment 1 of the present invention. The dispenser 10 is a needle valve type fixed discharge valve type dispenser, and applies the viscous fluid 4 accommodated in the syringe (container) 1 to the application target. As shown in the figure, the dispenser 10 includes a syringe 1, a needle valve 2, and a float 5.

(Syringe 1)
The main body shape of the syringe 1 of the present embodiment has a generally cylindrical shape, and the shape of the lower end portion with respect to the paper surface of the syringe 1 is a conical shape. The shape of the part is not limited to these shapes. The main body shape of the syringe 1 may be generally cylindrical, and is not particularly limited to a cylindrical shape. For example, the main body shape of the syringe 1 may be a rectangular tube shape or the like. Moreover, the shape of the front-end | tip part of the syringe 1 should just be a shape where the diameter of the cross section of a horizontal direction decreases monotonously as it approaches the bottom part of the syringe 1, and the cone shape of the syringe 1 of this embodiment is an example. is there. A discharge port 3 through which the viscous fluid 4 is discharged is formed at the bottom of the syringe 1.

  Although the outer diameter along the horizontal direction of the syringe 1 of this embodiment is 26.2 ± 0.25 mm, it is not limited to this. Moreover, although the height with respect to the vertical direction of the syringe 1 is about 158.6 mm, it is not limited to this.

(Needle valve 2)
The needle valve 2 is a needle-like valve, and is a valve mechanism that controls discharge of the viscous fluid 4 in the syringe 1 (a state where the discharge port 3 is opened) and stop of discharge (a state where the discharge port 3 is closed). . Specifically, as shown in FIG. 1A, the discharge of the viscous fluid 4 is stopped by closing the discharge port 3 at the tip of the needle valve 2 (discharge stop step). On the other hand, as shown in FIG. 1B, the viscous fluid 4 is discharged by moving the tip of the needle valve 2 away from the discharge port 3 (discharge step). In the dispenser 10, the compressed air is constantly pressurized with the needle valve 2 closed, and when the viscous fluid 4 is dripped, the needle valve 2 rises for a specified time, and the viscous fluid 4 having a specified dropping amount is dropped.

(Float 5)
FIG. 1D is a top view of the float 5. FIG. 1E is a side view of the float 5. The material of the float 5 of this embodiment is Teflon (registered trademark), but is not limited thereto. Moreover, although the shape of the float 5 of this embodiment is a cylindrical shape, it is not limited to this. For example, when the shape of the syringe 1 is a rectangular tube shape, the shape of the float 5 may be a prismatic shape in accordance with the shape of the syringe 1.

  In this embodiment, the clearance of the gap between the float 5 and the inner surface of the syringe 1 is 0.35 ± 0.25 mm (or 0.1 mm to 0.6 mm), and the outer diameter of the horizontal cross section of the float 5 is outside. The diameter r1 = Φ22.7 ± 0.05 mm. Further, the height of the float 5, which is the distance between the upper surface SUF1 and the lower surface SUF2 of the float 5, was set to a height h1 = 25 mm.

  In the central part of the float 5, a guide part 5 b that is an insertion hole is formed to allow the shaft of the needle valve 2 to pass therethrough. Further, on the opposite side of the float 5 from the side in contact with the viscous fluid 4, a hollow portion 5 a in which the periphery of the center portion is hollow is formed. The hollowed portion 5 a serves as a guide when the shaft of the needle valve 2 is inserted into the guide portion 5 b of the float 5 after the float 5 is inserted into the syringe 1. As a result, the shaft of the needle valve 2 can be easily passed through the center of the float 5.

  The shaft of the needle valve 2 passes through the center portion of the float 5. Thereby, since it can suppress that the direction of the float 5 with respect to the syringe 1 inclines, the pressure by compressed air can be uniformly transmitted to the viscous fluid 4 via the lower surface SUF3. Therefore, it is possible to suppress the inclusion of bubbles from the discharge port 3 due to the pressure due to the compressed air not being uniformly transmitted to the viscous fluid 4.

  Further, since it is necessary to open and close the needle valve 2 to discharge the viscous fluid 4 from the discharge port 3 and stop the discharge, the float 5 can move inside the syringe 1 independently of the needle valve 2. I am doing so.

  The upper surface SUF1 of the float 5 is in contact with the compressed air, and the side surface SUF2 along the vertical direction of the float 5 is close to the inner surface of the syringe 1. For this reason, the presence of the float 5 prevents the compressed air from coming into direct contact with the viscous fluid 4. Therefore, it can suppress that compressed air melt | dissolves in the viscous fluid 4. FIG. Further, the lower surface SUF3 of the float 5 is in contact with the viscous fluid 4.

  As described above, according to the dispenser 10, the entrainment of bubbles in the viscous fluid 4 and the inclusion of bubbles from the discharge port 3 can be suppressed. Moreover, the viscous fluid 4 in the syringe 1 can be used to the end by suppressing the entrainment of bubbles in the viscous fluid 4 and the inclusion of bubbles from the discharge port 3, and the viscous fluid 4 in the syringe 1 can be used efficiently. Can be used. Further, according to the dispenser 10, in a method (fluid application method) for controlling the discharge and stoppage of the viscous fluid 4 while constantly applying pressure with compressed air, the float 5 makes contact between the viscous fluid 4 and the air. By suppressing, dissolution of air into the viscous fluid 4 can be suppressed. For this reason, the dispenser 10 is particularly effective in a mechanism that constantly applies pressure to a viscous fluid with compressed air.

  Here, an experiment (molding process) was conducted in which the phosphor resin was accommodated in the syringe 1 of the dispenser 10 described above, and this phosphor resin was dropped using the dispenser 10. In this experiment, the pressure of the compressed air in the syringe 1 was set to 0.2 MPa. Moreover, the resin discharge amount per time of the needle valve 2 was 1.2 cc / time. Moreover, the charge amount in the syringe 1 per time of the needle valve 2 was set to 25 g / time. The viscosity of the phosphor resin was 2 to 15 Pa · s.

  As a result of the above experiment, as shown in FIG. 1C, even when the remaining amount of the phosphor resin in the syringe 1 is reduced, the occurrence of bubbles in the dropped resin is suppressed.

[Embodiment 2]
Next, FIG. 2 is a diagram illustrating a schematic configuration of a dispenser (fluid application mechanism) 20 according to the second embodiment of the present invention. The dispenser 20 is a needle valve type fixed discharge valve type dispenser, and applies the viscous fluid 4 accommodated in the syringe (container) 1 to the application target.

  The dispenser 20 of the present embodiment is different from the dispenser 10 of the first embodiment in that a float 50 is used instead of the float 5. Therefore, in the following description, the description of the configuration already described in the first embodiment is omitted as appropriate.

(Needle valve 2)
Similar to the dispenser 10 described above, in the dispenser 20, as shown in FIG. 2A, the discharge of the viscous fluid 4 is stopped by closing the discharge port 3 at the tip of the needle valve 2 (discharge stop). Step). On the other hand, as shown in FIG. 2B, the viscous fluid 4 is discharged by moving the tip of the needle valve 2 away from the discharge port 3 (discharge step). In the dispenser 20, the compressed air is constantly pressurized with the needle valve 2 closed, and when the viscous fluid 4 is dripped, the needle valve 2 is raised for a specified time, and the viscous fluid 4 having a specified dropping amount is dropped.

(Float 50)
FIG. 2D is a top view of the float 50. 2E is a side view of the float 50. FIG. The material of the float 50 of this embodiment is Teflon (registered trademark), but is not limited thereto. Moreover, although the shape of the float 50 of this embodiment is a combination of a columnar shape and a truncated cone shape, it is not limited to this. For example, when the shape of the syringe 1 is a rectangular tube shape, the shape of the float 50 may be a combination of a prismatic shape and a truncated pyramid shape according to the shape of the syringe 1. The angle formed by the frustoconical bus at the tip of the float 50 of the present embodiment and the central axis of the float 50 is an angle θ = 30 ° to 40 °, but is not limited thereto. The reason why the tip shape of the float 50 is a truncated cone shape is to prevent air from being mixed with the previously injected viscous fluid 4 when the float 50 is inserted into the syringe 1.

  In the present embodiment, the clearance of the gap between the float 50 and the inner surface of the syringe 1 is 0.35 ± 0.25 mm (or 0.1 mm to 0.6 mm), and the outer diameter of the cross section in the horizontal direction of the float 50 is The diameter r2 = Φ22.7 ± 0.05 mm. In addition, the height of the float 5 that is the distance between the upper surface SUF1 and the lower surface SUF2 of the float 50 is set to a height h2 = 25 mm. Moreover, the diameter of the discharge port 3 was set to the diameter r3 = Φ4 mm.

  A guide portion 50b, which is an insertion hole, is formed at the center of the float 50 so as to allow the shaft of the needle valve 2 to pass therethrough. Further, on the opposite side of the float 50 from the side in contact with the viscous fluid 4, a hollow portion 50 a in which the periphery of the center portion is hollow is formed. The function of the hollow portion 50a is the same as that of the hollow portion 5a described above.

  The shaft of the needle valve 2 passes through the center portion of the float 50. Thereby, since it can suppress that the direction of the contact surface (lower surface SUF3 ') with respect to the viscous fluid 4 of the float 50 inclines, the pressure by compressed air can be uniformly transmitted to the viscous fluid 4 via this contact surface. it can. Therefore, it is possible to suppress the inclusion of bubbles from the discharge port 3 due to the pressure due to the compressed air not being uniformly transmitted to the viscous fluid 4.

  Further, since it is necessary to open and close the needle valve 2 to discharge and stop the viscous fluid 4 from the discharge port 3, the float 50 moves inside the syringe 1 independently of the needle valve 2. I can do it.

  The upper surface SUF1 of the float 5 is in contact with the compressed air, and the side surface SUF2 along the vertical direction of the float 5 is close to the inner surface of the syringe 1. For this reason, the presence of the float 50 prevents the compressed air from coming into direct contact with the viscous fluid 4. Therefore, it can suppress that compressed air melt | dissolves in the viscous fluid 4. FIG. Further, the lower surface SUF <b> 3 ′ of the float 50 is in contact with the viscous fluid 4.

  Here, the shape of the float 50 of the present embodiment on the side in contact with the viscous fluid 4 is a truncated cone shape, and is a shape that monotonously decreases as the horizontal outer diameter approaches the discharge port 3. For this reason, air escapes upward along the shape of the lower surface SUF3 'of the float 50. Therefore, when the float 50 is set in the syringe 1, it is possible to prevent air from staying at the interface (the lower surface SUF3 ') between the float 50 and the viscous fluid 4. Further, according to the shape of the lower surface SUF3 ', it acts effectively to stably apply the viscous fluid 4 even when the remaining amount is reduced.

  According to the dispenser 20 having the above configuration, the entrainment of bubbles in the viscous fluid 4 and the inclusion of bubbles from the discharge port 3 can be suppressed. Moreover, the viscous fluid 4 in the syringe 1 can be used to the end by suppressing the entrainment of bubbles in the viscous fluid 4 and the inclusion of bubbles from the discharge port 3, and the viscous fluid 4 in the syringe 1 can be used efficiently. Can be used. Further, according to the dispenser 20, in the method (fluid application method) for controlling the discharge of the viscous fluid 4 and the stop of the discharge while being constantly pressurized with compressed air, the contact between the viscous fluid 4 and the air is suppressed by the float. Thus, dissolution of air in the viscous fluid 4 can be suppressed. For this reason, the dispenser 10 is particularly effective in a mechanism that constantly applies pressure to a viscous fluid with compressed air.

  Here, an experiment (molding process) was performed in which the phosphor resin was accommodated in the syringe 1 of the dispenser 20 described above, and the phosphor resin was dropped using the dispenser 20. In this experiment, the pressure of the compressed air in the syringe 1 was set to 0.2 MPa. Moreover, the resin discharge amount per time of the needle valve 2 was 1.2 cc / time. Moreover, the charge amount in the syringe 1 per time of the needle valve 2 was set to 25 g / time. The viscosity of the phosphor resin was 2 to 15 Pa · s.

  As a result of the above experiment, as shown in FIG. 2C, even when the remaining amount of the phosphor resin in the syringe 1 is reduced, the occurrence of entrainment of bubbles in the dropped resin is completely eliminated (defective). Incidence 0%).

[Embodiment 3]
Next, FIG. 3 is a diagram illustrating a schematic configuration of a viscous fluid application device (fluid application device) 30 including the dispenser 10 or the dispenser 20 described above.

  As shown in FIG. 3, the viscous fluid application device 30 has an X-direction stage 33 and a gantry frame 36 mounted on a device surface plate 38. The application position determination unit 32 can be moved in the X direction by the X direction stage 33, and the substrate 31 (application target) is mounted on the application position determination unit 32.

  Further, the Y direction stage 35 is connected to the gantry frame 36, and the dispensers 10 and 20 are movable in the Y direction.

  According to the viscous fluid coating device 30 described above, it is possible to realize a viscous fluid coating device capable of suppressing the entrainment of bubbles in the viscous fluid 4 and the inclusion of bubbles from the discharge port 3 in the dispensers 10 and 20. .

[Summary]
The fluid application mechanism according to the first aspect of the present invention is a fluid application mechanism that applies a viscous fluid to an application target, and includes a container that contains the viscous fluid, and a discharge port formed at the bottom of the container. A needle valve that is a valve mechanism for controlling the discharge of the viscous fluid by stopping the discharge of the viscous fluid by closing the tip of the valve, and moving the tip away from the discharge port; and A float that contacts the viscous fluid and moves inside the container, and the shaft of the needle valve passes through the center of the float, and the side surface along the vertical direction of the float is close to the inner surface of the container This is the configuration.

  According to the above configuration, the side surface along the vertical direction of the float is close to the inner surface of the container. For this reason, the presence of the float prevents the compressed air from coming into direct contact with the viscous fluid. Therefore, it can suppress that compressed air melt | dissolves in a viscous fluid.

  Moreover, according to the said structure, the axis | shaft of a needle valve has penetrated the center part of the float. Thereby, since it can suppress that the direction of the float with respect to a container inclines, the pressure by compressed air can be uniformly transmitted to a viscous fluid via the contact surface with respect to the viscous fluid of a float. Therefore, it is possible to suppress the inclusion of bubbles from the discharge port due to the pressure due to the compressed air not being uniformly transmitted to the viscous fluid.

  As described above, entrainment of bubbles in the viscous fluid and inclusion of bubbles from the discharge port can be suppressed. In addition, by suppressing the entrainment of bubbles in the viscous fluid and the inclusion of bubbles from the discharge port, the viscous fluid in the container can be used to the end, and the viscous fluid in the container can be used efficiently. it can. Further, as described above, the fluid application mechanism of the present invention suppresses dissolution of air into the viscous fluid by the float, and thus is particularly effective in a mechanism that constantly applies pressure to the viscous fluid with compressed air.

  In the fluid application mechanism according to aspect 2 of the present invention, in the aspect 1, the shape of the float in contact with the viscous fluid is a shape that monotonously decreases as the horizontal outer diameter approaches the discharge port. It is.

  According to the above configuration, the shape of the float that comes into contact with the viscous fluid has a shape that monotonously decreases as the horizontal outer diameter approaches the discharge port, so that air escapes upward along the shape. . For this reason, when a float is set in the container, air can be prevented from staying at the interface between the float and the viscous fluid. Moreover, according to the shape which decreases monotonously as the horizontal outer diameter approaches the discharge port, it acts effectively to stably apply the viscous fluid even when the remaining amount decreases.

  Further, in the fluid application mechanism according to aspect 3 of the present invention, in the above aspect 1 or 2, a hollow part in which the periphery of the central part is hollow is formed on the opposite side of the float to the side in contact with the viscous fluid. ing.

  According to the said structure, a hollow part plays the role of the guide at the time of penetrating the axis | shaft of a needle valve to the center part of a float after insertion of the float in a container. Thereby, it becomes easy to let the axis | shaft of a needle valve penetrate the center part of a float.

  A fluid application mechanism according to aspect 4 of the present invention is a fluid application method for applying the viscous fluid to the application object using any one of the fluid application mechanisms according to aspects 1 to 3. The discharge stop step of stopping the discharge of the viscous fluid by closing the discharge port at the tip end portion of the needle valve, and the viscous fluid is discharged by moving the tip end portion of the needle valve away from the discharge port. And a step of constantly pressurizing the side of the float opposite to the side in contact with the viscous fluid with compressed air.

  According to the above method, in the method of controlling discharge of viscous fluid and stopping of discharge while constantly applying pressure with compressed air, dissolution of air in the viscous fluid is suppressed by suppressing contact between the viscous fluid and air by a float. Can be suppressed.

  A fluid application apparatus according to aspect 5 of the present invention includes the fluid application mechanism according to any one of aspects 1 to 3.

  According to the said structure, the fluid application | coating apparatus which can suppress inclusion of the bubble with respect to the viscous fluid in a fluid application | coating mechanism, and the bubble inclusion from a discharge outlet is realizable.

[Additional Notes]
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

  INDUSTRIAL APPLICABILITY The present invention can be used for a fluid application mechanism that applies a viscous fluid to an application target and a fluid application device that includes the fluid application mechanism.

1 Syringe (container)
2 Needle valve 3 Discharge port 4 Viscous fluid 5,50 Float 5a, 50a Drilled part 10, 20 Dispenser (fluid application mechanism)
30 Viscous fluid application device (fluid application device)

Claims (5)

A fluid application mechanism for applying a viscous fluid to an application target,
A container containing the viscous fluid;
The discharge port formed at the bottom of the container is closed with the tip of a needle-like valve to stop the discharge of the viscous fluid, and the tip is moved away from the discharge port to discharge the viscous fluid. A needle valve that is a valve mechanism that performs control;
A float that contacts the viscous fluid and moves inside the container;
The needle valve shaft passes through the center of the float,
A fluid application mechanism, wherein a side surface of the float along a vertical direction is close to an inner surface of the container.   2. The fluid application mechanism according to claim 1, wherein the shape of the float that comes into contact with the viscous fluid is a shape that monotonously decreases as the horizontal outer diameter approaches the discharge port.   3. The fluid application mechanism according to claim 1, wherein a hollow portion in which the periphery of the center portion is hollowed is formed on a side of the float opposite to the side in contact with the viscous fluid. A fluid application method for applying the viscous fluid to the application object using the fluid application mechanism according to any one of claims 1 to 3,
A discharge stop step of stopping the discharge of the viscous fluid by closing the discharge port at the tip of the needle valve;
A discharge step of discharging the viscous fluid by moving the tip of the needle valve away from the discharge port, and
A fluid application method, wherein the opposite side of the float that is in contact with the viscous fluid is constantly pressurized with compressed air.   A fluid application apparatus comprising the fluid application mechanism according to any one of claims 1 to 3.

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