KR20140060275A - Valve for ejecting small amount of liquid material and capable of being assembled and disassembled without use of tool - Google Patents

Abstract

The liquid material injection valve for low discharge volume, which is easily disassembled and assembled without a tool, and easy to perform maintenance work such as cleaning and cleaning, includes a liquid material injection valve body and a restraining member. Specifically, the liquid material injection valve for a low discharge amount includes an adjustment section having a cylinder section, a microadjustment mechanism fitted to the base end side of the cylinder section, a liquid material inflow section for introducing the liquid material in the liquid material source, A discharge nozzle having an opening portion communicating with the fluid body, a needle body having a tip end which reaches the opening of the discharge nozzle, the needle body being inserted into an axial center of the piston body, And an inhibiting member for fixing the adjusting part and the fluid body part to prevent the adjusting part and the fluid body part from being separated from the cylinder part.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid material dispensing valve for disassembling and assembling a liquid material,

The present invention relates to a liquid material such as a liquid photoresist material, a surface protective film and a functional coating agent, particularly a liquid material containing a particulate material (hereinafter referred to as filler-containing Liquid material or the like) is extremely finely sprayed to form a thin film (film).

In the case of depositing a conductive paste-containing molten material and a phosphor material-containing liquid material on a semiconductor silicon chip, a glass substrate and various members, coating techniques such as film formation by a dispenser and film formation by screen printing have already been used.

Since the filler-containing liquid material is not a high-viscosity liquid material, sedimentation or agglomeration of the filler occurs, so that it is impossible to apply the thin film to the spray, dispenser or other coating method due to the low viscosity mixed with the diluting solvent.

Therefore, their materials are contained in a high-viscosity liquid material for anti-settling and then applied. This high-viscosity material is a material having a high viscosity of 500 CPS or more, for example, a dispenser or an LED device of 5 mm in size to 10 mm in size, in which a chip is mounted by a screen printing method On the entire surface of the substrate.

In this case, it is necessary to mix and stir while defoaming in vacuo so that no foaming occurs. In addition, since the coating material must be uniformly dispersed and uniformly dispersed on the vapor deposition surface even when the coating is applied, the cost for discharge amount control and viscosity control is increased. In addition to the production, Waste was required.

For example, since the phosphor is made of GaN or InGaN semiconductor and directly contacted with the surface of the LED chip corresponding to the size of 2 mm to 3 mm in size, it is preferable in terms of luminous efficiency, so that the phosphor powder is directly applied thinly on the surface of the semiconductor chip It is preferable to evaporate the post-solvent. There is considered a discharging valve for spraying the low-viscosity coating material obtained by mixing the phosphor powder with a solvent or a solvent including some insulating material while stirring and without sedimentation and agglomeration, but it is not structurally possible to spray the spray gun with sufficient stirring by itself Do. Therefore, although there is a method of circulating the low-viscosity liquid by a method capable of obtaining the stirring effect, it was impossible from a structural point of view to be able to provide the circulation circuit near the discharge nozzle and the needle for controlling the spray.

Therefore, it is possible to easily and reliably adjust the supply amount of a small amount or a small amount of a desired amount by forming particles of a liquid or a molten product equal to or higher than the level at which ultrafine particles are formed by ultrasonic atomization and air brush spraying, A thin liquid film or a thin film of a liquid or molten material such as a liquid photoresist material, a surface protective film, and a functional coating agent is sprayed on a semiconductor silicon wafer, a glass substrate and various transparent members, (Patent Document 1).

However, it is difficult to handle the liquid material containing the spray device filler of a small amount as described above, and it is very difficult to perform maintenance work such as cleaning and cleaning because of the large number of parts once clogging has occurred.

In addition, since the above-described small-volume liquid atomizing apparatus is often used by being attached to an industrial robot arm, it is also very difficult to disassemble and perform maintenance work such as cleaning and cleaning.

Therefore, in conventional two-fluid air-spray valves and air-brush-type spray valves, it is possible to remotely operate, in particular, by using compressed air to generate molten liquid as atomized particles to form circular patterns of intermittent operation and to form linear patterns in continuous operation An automatic spraying valve (hereinafter referred to as an automatic gun) was fixedly assembled using several types of fastening screws to maintain airtightness and mechanical strength. Therefore, in order to clean the wetting portion of the coating liquid, it takes a long time to fix the fastening screw, and furthermore, there is a disadvantage in terms of maintenance cost due to wear deterioration caused by repetitive operation of fastening screws and the like, there was.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2009-28701

SUMMARY OF THE INVENTION It is an object of the present invention to provide a low-discharge-volume liquid material injection valve which is easy to disassemble and assemble without tools and which is easy to perform maintenance work such as cleaning and cleaning.

As a result of intensive studies to solve such problems, the inventor of the present invention has found that a spray method called an airbrush, which is a special spray method using air spray, Thereby solving the above problems.

A liquid material injection valve for a low discharge amount capable of disassembling and assembling without tools according to the present invention comprises a cylinder part having a piston body vertically movably mounted thereon and a cylinder part mounted on a base end side of the cylinder part, A liquid material inlet portion which is fitted to the leading end side of the cylinder portion and which receives the liquid material from the liquid material source, and an air inflow portion which introduces the compressed air in the compressed air source, A liquid material injection valve main body having a body part, an ejection nozzle having an opening communicating with the fluid body part, and a needle body fitted to an axial center of the piston body and having a tip reaching an opening of the ejection nozzle, For preventing the fluid body from being separated from the cylinder portion It characterized in that it comprises a body portion and a fluid portion inhibitory member for fixing.

In the present specification, the low discharge amount refers to a discharge amount of about 0.1cc to 5cc per minute.

With the above-described construction, it is possible to easily disassemble and assemble without a tool, and there is an advantage that maintenance work such as cleaning and cleaning is easy.

In addition, it is preferable that the adjusting section and the fluid body section have a ring-shaped outer periphery, the ring-shaped outer periphery is provided with a recess, and the restraining member has a binding member for binding to the recess, It is preferable that the liquid material injection valve main body is fitted and supported by the restraining member.

The restraining member has a base portion and first and second U-shaped binding members rotatably supported at the lower end of the base portion, wherein the liquid of the liquid And the lower end of the first and second U-shaped fastening members is fastened to the circular outer circumferential concave portion of the fluid body portion by inserting the material injection valve main body and the upper end portions of the first and second U- It is preferable that the liquid material injection valve main body is fitted and supported by a restraining member so as to be adhered to the annular outer circumferential concave portion.

Further, the liquid material discharging portion is provided in the fluid body portion, and the liquid material inlet portion and the liquid material discharging portion are communicated with each other, so that an excess portion of the liquid material flowing in the liquid material inlet portion is discharged from the liquid material discharging portion, And the liquid material is circulated and supplied when returning to the source of the liquid material.

The liquid material injection valve according to claim 1, wherein the liquid material is a filler-containing liquid material and the filler-containing liquid material is injected, wherein the tip of the needle material is tapered so that the ejection nozzle corresponds to a tip inclination of the needle body Wherein the tip of the needle body is protruded from the tip of the discharge nozzle so that the pulling out of the needle body is controlled so that the tip of the filler- It is preferable to make the discharge amount adjustable. This structure is particularly suitable for a case where the average particle diameter of the filler is about 8 to 10 mu m and the maximum particle diameter is about 30 mu m. In this case, it is preferable that the tip angle of the needle body is 5 to 30 degrees. The content of the particle size distribution of the filler can be measured by a dynamic light scattering method using a dynamic light scattering particle size distribution measuring device or the like.

Wherein the liquid material is a filler-containing liquid material, and the liquid material injection valve for injecting the filler-containing liquid material is characterized in that the needle body has a tip tapered shape so that the discharge nozzle is in contact with a tip end of the needle body The tip end of the needle body can not be projected from the tip of the discharge nozzle and the drawing of the needle body can be controlled so that the discharge amount of the filler-containing liquid material can be varied It is possible. Such a structure is particularly suitably used when the average particle diameter of the filler is about 20 to 30 mu m and the maximum particle diameter is about 80 mu m. In this case, it is preferable that the tip angle of the needle body is 45 ° to 120 °.

It is preferable that an air cap for regulating a flow path of compressed air is provided below the discharge nozzle hole so that a flow of spray air is formed when the liquid material is discharged.

And the flow of the atomizing air is generated by the inner wall flow path formed on the inner wall surface of the air cap.

It is preferable that the groove is formed with five or more inner wall flow paths, the slot is concentrated toward the outlet opening of the air cap, and the outlet opening is formed with a notch corresponding to the groove.

In addition, the flow of the atomizing air can be generated by the surrounding flow path formed around the outlet opening of the air cap.

Further, the air cap has an inner cap and an outer cap, an outer circumferential flow path is radially formed on the outer circumferential surface of the inner cap, and the outer circumferential flow path is concentrated toward the outlet opening.

It is more preferable that the atomized air is rotated while being mixed with the liquid material at the outlet opening of the air cap.

By using the liquid material ejection valve for low discharge amount of the present invention, liquid materials such as a liquid photoresist material, a surface protective film, and a functional coating agent, and particularly, a liquid material such as a semiconductor silicon chip, a glass substrate, The thin film can be formed by spraying the filler-containing liquid material containing the fine particle material extremely finely.

For example, even in the case of a white illumination technique using LED, if a white LED can be fabricated by applying a liquid material containing a YAG phosphor, which is easy to sink to an LED device implementing a GaN or InGaN chip, by circulating the liquid, It contributes greatly to productivity improvement.

When applying such a filler-containing liquid material, it is necessary to prevent the fluid circuit portion from being pushed and rinsed by the cleaning liquid after the operation termination of the liquid material injection spray valve, and also to disassemble the wetted liquid portion to clean the concave portion of the wetted portion cleanly It should be cleaned. The low-discharge-volume liquid material injection valve of the present invention can be easily disassembled and assembled in a short time without a cleaning tool, which is advantageous in reducing maintenance and increasing throughput.

According to the liquid material injection valve for a low discharge amount which can be disassembled and assembled without a tool of the present invention, it is possible to provide a liquid material injection valve for a low discharge amount which can be easily disassembled and assembled without a tool and easy maintenance work such as cleaning and cleaning Effect.

Further, according to the liquid material injection valve for a low discharge amount which can be disassembled and assembled without a tool of the present invention, it is possible to reduce the number of parts, eliminate the fixing screws necessary for assembling each part as much as possible, have.

Further, according to the liquid material ejection valve for a low discharge amount which can be disassembled and assembled without a tool according to the present invention, it is possible to provide an insulating liquid material containing a phosphor used for forming a conductive paste-containing molten material and an LED on a semiconductor silicon chip, a glass substrate, A uniformly thin film of a circular pattern having a diameter of 10 mm or less, particularly 2 mm to 9 mm, and a linear pattern of 10 mm or less, particularly 1 mm to 9 mm, can be formed.

1 is a perspective view showing one embodiment of a liquid material ejection valve for a low ejection amount which can be disassembled and assembled without a tool according to the present invention.
Fig. 2 is an exploded perspective view showing one embodiment of a low discharge amount liquid material injection valve capable of disassembling and assembling without tools of the present invention. Fig.
Fig. 3 is an exploded assembly explanatory view of a low discharge amount liquid material injection valve which can be disassembled and assembled without the tool shown in Fig. 1. Fig.
Fig. 4 is an exploded assembly explanatory view of a low discharge amount liquid material injection valve which can be disassembled and assembled without the tool shown in Fig. 1. Fig.
Fig. 5 is a cross-sectional view of the low-discharge-volume liquid material injection valve shown in Fig.
6 is a block diagram showing a valve operation.
FIG. 7 is a schematic view showing the use state of the liquid material injection valve for low discharge amount which can be disassembled and assembled without a tool according to the present invention. FIG.
Fig. 8 is a graph showing the measurement results after applying the liquid material, and is a graph showing the relationship between the coating width and the thickness.
Fig. 9 is a cross-sectional view showing another embodiment of the low-discharge-volume liquid material injection valve that can be disassembled and assembled without a tool according to the present invention, and is a cross-sectional view except for the restraining member.
10 is a perspective view of one embodiment of the air cap used in the low-discharge-volume liquid material injection valve of the present invention as viewed from the front.
11 is a perspective view of one embodiment of the air cap used in the low-discharge-volume liquid material injection valve of the present invention, as viewed from the back surface side.
12 is a plan view showing another embodiment of the air cap used for the low discharge amount liquid material injection valve of the present invention.
13 is a plan view showing still another embodiment of the air cap used in the liquid material ejection valve for low discharge amount of the present invention.
14 is a plan view showing another embodiment of the air cap used in the liquid material ejection valve for a low discharge amount of the present invention.
Fig. 15 is a perspective view showing another embodiment of the air cap used in the liquid material ejection valve for low discharge amount of the present invention, and shows an inner lid. Fig.
16 is a perspective view showing a state in which an outer cap is mounted on an inner cap of the air cap shown in Fig.

Hereinafter, embodiments of the present invention will be described. However, these embodiments are illustrative examples, and it goes without saying that various modifications are possible without departing from the technical idea of the present invention.

In the drawings, reference numeral 10 denotes various embodiments of the low-discharge-volume liquid material injection valve which can be disassembled and assembled without the tool of the present invention.

1 and 2, the low-discharge-volume liquid material injection valve 10 includes a cylinder portion 14 in which the piston body 12 is vertically movably accommodated, a base portion 14a of the cylinder portion 14, A regulator (16) fitted to the cylinder portion (14) and having a microadjustment mechanism for moving the piston body (12) up and down; A fluid body inlet portion 18 for introducing the compressed air in the compressed air source and an air inlet portion 20 for introducing the compressed air in the compressed air source and an opening portion 77 communicating with the fluid body portion 22 And a needle body (26) which is fitted in the central axis of the piston body (12) and whose tip reaches the opening (77) of the ejection nozzle (74). The liquid material injection valve body (28), the regulator (16) and the fluid body part (22) And an inhibiting member 30 for fixing the adjusting portion 16 and the fluid body portion 22 in order to prevent the cylinder portion 14 from being separated.

2, the adjuster 16 includes an adjusting screw 34 fitted to the adjusting ring 32 and an upper body 38 (see FIG. 2) which receives the adjusting screw 34 through the O- ), And micro adjustment is possible by the microadjustment mechanism.

The upper body 38 at the lower end of the regulator 16 has an outer periphery 40 of an annular shape and a recess 42 is formed in the outer periphery 40 of the annular shape. Reference numeral 44 is a stationary ring for rigidifying the assembly.

2, the cylinder portion 14 includes a needle retainer 46 for holding the needle body 26, a piston body 12 in which a spring 48 is inserted outside, a large O-ring 50 A cylinder body 52 in which the piston body 12 is accommodated and a cylinder body 52 which is screwed or fitted to supply air to the lower portion of the piston body 12, Lt; RTI ID = 0.0 > 54 < / RTI >

The intermediate body 54 has an opening 53 at its center and the needle body 26 is inserted through the needle retainer 46 into the axial center of the piston body 12 and through a small O- Is inserted into the intermediate body portion (54).

The intermediate body portion 54 is provided with a compressed air inlet fitting 58 and the piston body 12 is urged upward by compressed air from a compressed air source. Thus, the piston body 12 can be moved up and down by adjusting the supply amount of the compressed air.

A fluid body 22 is fitted to the lower end of the intermediate body 54, which is the tip of the cylinder 14. An inlet fitting 60 for connecting a return pipe of a liquid material is provided on the side surface of the fluid body portion 22 and the liquid material inflow portion 18 is connected to the liquid material inflow portion 18 through a seal ring 62 and a fastening nut 64 The liquid circulation fitting 66 is screwed and a liquid container 70 is mounted to receive the liquid material to be applied through the R adapter 68 fitted to the liquid circulation fitting 66. [

The liquid material discharge portion 92 is provided in the fluid body portion 22 so that the liquid material inflow portion 18 and the liquid material discharge portion 92 are communicated by the flow path 94 and the liquid material inflow portion 18, And an excess portion of the liquid material introduced from the liquid material discharging portion 92 is returned to the liquid material source so that the liquid material is circulated and supplied.

An air fitting (72) for compressed air is provided in the air inlet (20) provided on the side of the fluid body (22), and compressed air is supplied from a compressed air supply source.

A needle cover 26 is inserted in the center of the bottom surface of the fluid body 22 and a needle cover 24 covering the discharge nozzle 74 and the needle body 26, And an air cap 78 for regulating the flow path of the compressed air are screwed, respectively.

The restraining member 30 has a base portion 80 and a first U-shaped binding member 82 and a second U-shaped binding member 84 to which the lower end portion is rotatably supported by the base portion 80, The liquid material injection valve main body 28 is inserted into the gap 86 between the lower ends of the first U-shaped fastening member 82 and the second U-shaped fastening member 84 so that the first U- And the lower end of the second U-shaped fastening member 84 are fastened to the outer circumferential recess 88 of the ring-shaped body of the fluid body 22 and the first U-shaped fastening member 82 and the second U- The liquid material injection valve main body 28 is fitted and supported by the restraining member 30 so as to bind the upper end of the member 84 to the concave portion 42 on the outer periphery of the annular shape of the regulator 16. [ Further, the restraining member 30 is mounted at a desired position by the mounting bolt 90. [

Next, an assembly example of the low-discharge-use liquid material injection valve 10 of the present invention described above is shown in Fig. 3 and Fig.

The discharge nozzle 74 and the fluid body portion 22 to which the needle cover 24 and the air cap 78 are coupled is mounted and joined to the intermediate body portion 54 to form the first U- 82 and the lower end of the second U-shaped fastening member 84 to the lower end of the first U-shaped fastening member 82 and the lower end of the second U- 22 on the annular outer peripheral recessed portion 88 (FIGS. 3 (a) and 3 (b)).

Then, the piston body 12 and the spring 48 are inserted into the cylinder body 52, and the piston body 12 and the spring 48 are fitted and fitted with the intermediate body portion 54, and then the upper body portion 38 is fitted and assembled (c) to (e)).

Next, the upper end portions of the first U-shaped fastening member 82 and the second U-shaped fastening member 84 of the restraining member 30 are fastened to the recessed portion 42 on the outer periphery of the annular shape of the adjusting portion 16 3 (f) and (g)).

After the needle body 26 is fixed to the piston body 12 by the needle retainer 46 and the piston body 12 is moved up and down to fix the liquid amount adjusting adjuster 16 of the liquid material to the cylinder portion 14 (Figs. 3 (h) to 3 (k)).

In this way, all parts can be mounted by fitting or screwing, and the assembly is easy because the number of parts is small, and a series of assembling operations is completed within two minutes.

Naturally, the decomposition assembly goes on to work in reverse order. The disassembling operation time can be shortened at a half time (about 1 minute) of the assembling time.

In addition, the illustrated fluid body portion 22 has shown a circulating type. It is possible to prevent sedimentation of the filler-containing liquid material by connecting a circulation circuit through the inlet fitting 60 to the fluid body 22 in front of the discharge nozzle 74. Airbrushes are also used as small spraying valves for plastic model parts and small products.

The diameter of the opening of the discharge nozzle 74 is 0.5 mm or less and the needle body 26 used for the spraying control of the paint is needle-like. The coating liquid (liquid material) When the flow starts, the surrounding compressed air is atomized by the ejector effect (see FIGS. 5 (a) and 5 (b)).

The amount of liquid material to be dispensed can be controlled manually by performing pulling control of the needle body 26. Quantitative control adjustment requires considerable skill and the width of the atomized pattern to be coated is determined by the distance between the tip of the discharge nozzle 74 and the surface to be coated When the distance is about 20 ~ 40mm, it is narrow about 10mm.

However, the discharge amount can be narrowed to 1 cc or less per minute, and the tip of the discharge nozzle 74 can approach the surface to be coated up to about 10 mm, and it is also possible to form liquid fine particles of 10 μm or less. 74) are close to each other, it is possible to coat the painted object with high efficiency of 80% or more.

The present invention utilizes the above-described airbrushing method for hand work in an automatic dispensing nozzle mechanism and further adds a thin and small circulation circuit in front of the dispensing nozzle 74 to uniformly spray coat the filler-containing liquid material succeded.

For example, a low-viscosity liquid material made by mixing about 30% by volume of a resin containing a diluting solvent having a viscosity of 50 CPS or less has a circular pattern with a diameter of 10 mm or less or a linear pattern with a diameter of 10 mm or less The film formation becomes possible.

The liquid material injection valve 10 for a low discharge amount according to the present invention is characterized in that a tip end portion of a needle body 26 serving as a mechanism for controlling discharge of a liquid material to a discharge nozzle 74 having a diameter of 0.5 mm or less, The opening degree of the drawing of the needle body 26 is adjusted in units of 10 탆 when the liquid material is discharged by protruding to the center of the hole of the outlet hole needle cover 24 of the discharging nozzle 74 It is possible to atomize air with a possible structure.

Therefore, by providing the adjustment screw 34 capable of adjusting the withdrawal of the needle body 26 in units of 10 mu m, reproducibility of discharge amount per opening and closing of the valve is ensured and stable discharge is obtained.

When the liquid material is discharged along the leading end portion of the very thin needle body 26, the liquid material is atomized by the compressed air flow of 0.2 MPa or less around the periphery thereof to have a negative pressure effect, The needle cover 24 having a diameter of 2.0 mm or less, which is ejected from the ejection nozzle 74, is collided and diffused by a pneumatic air flow having a compression pressure of 0.2 MPa or less to promote the atomization and spread the atomization pattern area of the new liquid material.

5, the leading end of the needle body 26 is tapered so that the leading angle? 1 is 5 占 and the discharging nozzle 74 is located at the right side of the needle body 26 And a tip end of the needle body (26) is protruded from a tip end of the ejection nozzle (74), and the needle body (26) is provided with an abutting annular seat body (Fig. 5 (c) and Fig. 5 (d)). Such a configuration is particularly suitable when the liquid material is a filler-containing liquid material and the filler size is small, particularly when the average particle size of the filler is about 8 to 10 mu m and the maximum particle size is about 30 mu m.

As shown in Fig. 6, the low-discharge-volume liquid material injection valve 10 is configured to discharge the liquid material stored in the liquid material tank 98, which is the source of the liquid material into which the filler-containing liquid material always stirred by the electromagnetic stirrer 96, The liquid material return tube 104 for returning the liquid material to the liquid material tank 98 always with the liquid material supply pipe 102 is prepared so as to be supplied in a fixed amount by the constant amount supply pump 100, The liquid material is always returned to the liquid material tank 98 regardless of the operation of the liquid material tank 10. The liquid material supply tube 102 is connected to the liquid container 70 and the liquid material return tube 104 is connected to the liquid material discharge portion 92 through the inlet fitting 60.

The discharge pressure at the time of discharging from the liquid material injection valve 10 for low discharge amount becomes the pressure obtained by adding the resistance pressure of the liquid material recovery pipe to the pressure of the liquid material constant amount supply pump 100. [ The compressed air supply pipe 106 for valve operation is connected to the intermediate body portion 54 of the low discharge amount liquid material injection valve 10 via the inlet fitting 58 and the air The compressed air supply piping 108 for atomization is connected through the fitting 72 to regulate the compressed air pressure in each air pressure regulator.

For example, when the solenoid valve for general atomization is started, the solenoid valve for valve operation is started about 100 ms after the start of operation, and when discharging is completed, the solenoid valve for valve operation is firstly closed The procedure for terminating the atomization solenoid valve after 50 ms is suitable for optimal atomization of the liquid material.

The liquid material injection valve 10 for low discharge amount is operated by a solenoid valve for valve operation so that compressed air flows into the cylinder body 52 in which the piston body 12 is inserted in the valve operation compressed air supply pipe 106, The piston 12 is operated toward the adjusting screw 34 so that the rear end of the needle body 26 connected to the piston body 12 strikes the adjusting screw 34 and the stroke of the needle body 26 is stopped at the correct position .

The liquid material in the liquid material supply portion 110 in the fluid body portion 22 from the discharge nozzle 74 is discharged from the liquid material supply portion 100 due to the pressure of the liquid material constant amount supply pump 100, The flow path 73 of the liquid material supply unit 110 in the fluid body portion 22 is a tubular tube having a diameter of 1.5 mm or less so that the flow rate of the liquid material in the tube can be set to 3000 mm to 6000 mm per second for preventing sedimentation of the material, When the compressed air is supplied to the front end surface of the needle body 26 from the inside of the needle body 74 by the ejector effect of atomizing pressurized air supplied from the compressed air supply piping 108 for atomizing the valve, The liquid material is sprayed together with the compressed air stream 112 for atomization to the center outlet of the air cap 78 as shown in Fig. 7 to form an atomization pattern.

Thus, as shown in Fig. 7, it is attached to the inside of the LED device 114, particularly to the LED chip 116. The uncoated liquid material enters the liquid material return tube 104 made in the tubular tube having a diameter of about 1.0 mm and returns to the liquid material tank 98.

The atomized particles are attached not only to the LED chip 116 provided inside the LED device 114 but also to the reflection wire such as a connection wire for fine wires and a reflector formed around the LED chip 114, This film forming range can be adjusted by the compressed air supply pressure for atomization and the compressed air supply pressure (or flow rate) for the spray pattern.

In order to narrow the atomization pattern diameter, it is necessary to reduce the compressed air supply pressure (or flow rate) for the spray pattern, narrow the distance between the object to be dispensed with the liquid material injection valve 10 for low discharge amount, The pressure (or the flow rate) is increased and the distance between the object to be dispensed and the liquid material injection valve 10 for the low discharge amount is widened.

The adjustment of the amount of deposition, that is, the amount of discharge is related to the amount of opening and closing of the adjusting screw 34 provided at the rear end of the liquid material injection valve 10 for low discharge amount. When the adjustment screw 34 is opened, the discharge amount increases and the discharge amount decreases according to the closing amount.

As shown in FIG. 5, the liquid material injection valve 10 for a low discharge amount shown in the drawing is a circulation type in which a liquid material is circulated and used. As described above, the liquid material is a filler- Especially when the average particle diameter of the filler is about 8 to 10 mu m and the maximum particle diameter is about 30 mu m.

On the other hand, when the liquid material is a filler-containing liquid material and the filler size is large, the liquid material injection valve for low discharge amount, which is suitably used when the average particle diameter of the filler is about 20 to 30 μm and the maximum particle diameter is 80 μm, Respectively.

9, reference numeral 118 denotes another embodiment of the liquid material ejection valve for low ejection amount. The liquid material injection valve 118 for a low discharge volume is formed such that the tip end angle of the needle body 120 is smaller than that of the needle body 26 of the low discharge amount liquid material injection valve 10 . In the example of Fig. 9, an example in which the tip angle [theta] 2 of the needle body 120 is 45 [deg.] Is shown.

The liquid material ejection valve 118 for low discharge amount is provided with a discharge nozzle 122 having an opening 123 and an abutting annular ring body 124 having an abutment portion corresponding to the inclination of the tip end of the needle body 120 And the tip of the needle body 120 can not protrude from the tip of the discharge nozzle 122. By controlling the drawing of the needle body 120, the discharge amount of the filler-containing liquid material (Fig. 9 (c) and Fig. 9 (d)).

A needle body 120 is inserted in the center of the bottom surface of the fluid body 22 and a discharge nozzle 122 through which the liquid material is discharged together with air is attached to the cover member 126, Respectively.

Since the other constitution of the liquid material injection valve 118 for low discharge amount is the same as that of the above-described liquid material discharge valve 10 for low discharge amount, detailed description is omitted again.

Next, preferred embodiments are shown as the air cap 76 or the cover member 126 used for the low-discharge-volume liquid material injection valve 10, 118 of the present invention. In addition, since the cover member 126 is a needle cover and an air cap, it is included in the air cap referred to in the specification, which performs the action of the air cap.

10 and 11 show another embodiment of the air cap used for the low-discharge-volume liquid material injection valve 10, 118 of the present invention. The air cap 128 is an air cap for regulating a flow path of compressed air provided below the openings of the discharge nozzles 74 and 122. When the liquid material is discharged, a flow of pulverized air is formed together with the liquid material have.

The air cap 128 has a base portion 130, a convex portion 132 provided in the base portion 130 and an outlet opening portion 134 opened in the convex portion 132 in the illustrated example. 10, the outlet opening 134 is formed in a star shape, and five notches 136 are formed.

11, an inner wall flow passage 138 is formed on the back side thereof. The inner wall flow passage 138 is a groove corresponding to the notch 136 and is focused toward the outlet opening 134 of the air cap 128. The outlet opening 134 serves as a notch 136 corresponding to the groove. In the example of Fig. 11, five grooves are formed in the inner flow path 138. Accordingly, when the liquid material is discharged, the atomized air in the compressed air source together with the liquid material is discharged from the notch 136 through the inner wall flow passage 138, whereby the flow of atomized air together with the liquid material is formed . Then, the atomizing air is rotated and mixed with the liquid material from the outlet opening 134 of the air cap 128, and is ejected.

10 and 11 show examples in which the notches 136 and the inner wall flow path 138 are each formed with five stars. However, as long as the notch and the inner wall flow passage are formed, for example, 13 is also applicable.

12, the air cap 140 has a base portion 142, a convex portion 144 provided in the base portion 142, and an outlet opening 146 opened in the convex portion 144. 12, the exit opening 146 is formed with eight notches 148. As shown in FIG. And an inner wall flow passage corresponding to the notch 148 is formed. As described above, it is preferable that five grooves are formed as the inner wall flow path, and at least five notches corresponding thereto are formed.

13, the air cap 150 has a base portion 152, a convex portion 154 provided in the base portion 152, and an outlet opening portion 156 opened in the convex portion 154. As shown in FIG. 13, five notches 158 are formed in the exit opening 156. The notch 158 has a shape in which a rectangular groove is spread radially, but is applicable as a notch of this shape. An inner wall flow passage is formed corresponding to the notch 158. As described above, it is preferable that five grooves are formed as the inner wall flow path, and at least five notches corresponding thereto are formed.

Next, Fig. 14 shows another embodiment of the air cap used in the low-discharge-quantity liquid material injection valve 10, 118 of the present invention.

The air cap 160 has a base portion 162, an outlet opening portion 164 provided in the base portion 162, and a plurality of peripheral flow paths 166 formed around the outlet opening portion 164. The flow of the atomizing air is generated by a plurality of peripheral flow paths 166 formed around the outlet opening 164 of the air cap 160. Thus, a spray air flow is formed with the liquid material. Then, the atomizing air is swirled and mixed with the liquid material at the outlet opening 164 of the air cap 160.

Next, Figs. 15 and 16 show another embodiment of the air cap used for the low-discharge-volume liquid material injection valve 10, 118 of the present invention.

The air cap 170 has an inner cap 172 and an outer cap 184 and an outer circumferential flow path 174 is radially formed on the outer circumferential surface of the inner cap 172, And is focused toward the opening 176. The inner cap 172 is constituted by a base portion 178, a plurality of radial convex portions 180 provided on the base portion 178 and an outer circumferential flow path 174 formed on the outer circumferential surface thereof. The outer cap 184 includes an outer outlet opening 182 at its center. By connecting the outer cap 184, the flow path of the compressed air is regulated. Thus, an air flow of the spray is formed together with the liquid material. The atomizing air is then pivoted and mixed with the liquid material at the inner outlet opening 176 and the outer outlet opening 182 of the air cap 170.

By applying static electricity behind the needle body of the liquid material injection valve for low discharge amount, the liquid material to be granulated becomes finer after being sprayed. The liquid material injection valve for a low discharge amount according to the present invention described above is manufactured by manufacturing a component other than a needle body with an insulating component having a volume resistivity of 10 ¹³ Ω · cm or more and applying a direct current high voltage of DC-10000 V at the rear portion of the needle body It is possible to apply a low discharge amount with static electricity by connecting a high-voltage insulated wire and adding a polar solvent so that the pillar-free liquid material has a volume resistivity of 10 ⁶ Ω · cm or less and setting the conductivity to 10 mS / cm or less Do. The small liquid particles of the liquid material have a disadvantage in that they are difficult to adhere to the object to be coated because the solid content is greatly increased, but they are easy to adhere due to the electrostatic force, and the arrival efficiency is good. The difference in arrival efficiency between the case with and without the electrostatic charge was about 5 ~ 10%.

In addition, the dispersion of fine particles was suppressed by setting the conductivity of the liquid material to 5 mS / cm or less with an aqueous material having a volume resistivity of 10? 占 이하 m or less.

(Example)

The result of the measurement experiment of the liquid material injection valve 10 having the low discharge amount as described above will be described below.

(Example 1) Measurement of flow rate distribution of spray pattern (1) The viscosity of the liquid material was set to 30 CPS. (1: 1 mixed solvent of methyl ethyl ketone and toluene in a weight ratio of 1: 1) diluted with a 4 weight ratio diluent (100 weight% of viscosity: 3000 CPS) of a silicone sealant solution having a weight ratio of 1 and adding a YAG fluorescent substance having a weight ratio of 30% A viscometric NV value of 17%).

(2) The specific gravity of the liquid material was 1.3.

(3) In the liquid material quantity feed pump 100, the hydraulic pressure of 0.01 MPa in the tube pump was 60 cc / min.

(4) The distance from the discharge nozzle 74 to the target object (flat glass of 200 mm square size) was 20 mm.

(5) The compressed air pressure for atomization was varied from 0.1 Mpa to 0.2 Mpa, respectively.

(6) The discharge time was set to 100 ms.

(7) The stroke amount of the needle body 26 was adjusted to 1 mm by the adjustment screw 34 of the liquid material injection valve for low discharge amount, and the discharge amount was set to 0.002 mg.

(8) The liquid material injection valve for the low discharge amount was fixed, and the film thickness distribution under the direct discharge was measured. The results are shown in Fig.

The application conditions of A to C in Fig. 8 are as follows.

number Compressed air pressure for atomization (MPa) A 0.1 B 0.15 C 0.2

As a result of the experiment under the above conditions, a desired coating state was obtained in which the film thickness was 25 mu m or less, all within a width of 10 mm as shown in Fig.

(Example 2) Evaluation of coating performance on a conductive substrate

(1) Coating material: a conductive substrate having a surface electric resistance of 10 ⁶ ? · Cm ²

(2) Liquid material applied: Aqueous liquid-proof moisture-proof insulating material (manufactured by Nitto Shinko Co., Ltd.) which is an aqueous emulsion having a solid content of 26.2% (volume ratio)

(3) Liquid material viscosity: 10 mPas

(4) Liquid material conductivity: 2 mS / cm

(5) Emulsion Particle size: 0.2 to 6 탆 Microspheres

(6) Liquid material injection valve discharge amount for low discharge amount: 4.6 cc / min

(7) Flow rate of liquid material injection valve for low discharge amount: 200 mm / s

(8) Coating width at one stroke: 8 ± 0.5 mm (almost no scattering)

(9) Liquid material for low discharge volume Distance from injection valve and substrate surface

(10) Pitch Coating: 7.5mm

(11) Constant voltage applied at the rear of the needle body: DC-10000V Short-circuit current value 60μA

As a result of applying the liquid material to the conductive substrate under the above conditions, a smooth coated surface having a thickness of 11 to 13 m was obtained. The arrival efficiency was 95%.

10,118: Liquid material injection valve for low discharge volume which can be disassembled and assembled without tools
12: piston body 14: cylinder part
16: adjusting part 18: liquid material inlet part
20: air inflow part 22: fluid body part
24: Needle cover 26, 120: Needle body
28: liquid material injection valve body 30: inhibition member
32: Adjustment mechanism 34: Adjusting screw
36: O-ring 38: upper body part
40: outer circumference 42,88:
44: connecting ring 46: needle retainer
48: spring 50: large O-ring
52: Cylindrical bodies 53, 77, 123:
54: intermediate body 56: small O-ring
51, 61: inlet fitting 62: sealing ring
64: fastening nut 66: fitting for liquid circulation
68: R adapter 70: liquid container
72: air fitting 73:
74, 122: Discharge nozzle 75: abutting annular sheet body
78, 128, 140, 150, 160, 170: Air cap 80:
82: first U-shaped fastening member 84: second U-shaped fastening member
86: Clearance 90: Mounting bolt
92: liquid material discharge portion 94:
96: electromagnetic stirrer 98: liquid material tank
100: liquid material quantity feed pump 102: liquid material feed pipe
104: liquid material recovery pipe 106: compressed air supply pipe for valve operation
108: compressed air supply piping for atomization 110: liquid material supply part
112: compressed air stream for atomization 114:
116: chip 124: abutting annular ring body
126: cover member 130, 142, 152, 162, 178:
130, 132, 144, 154: convex portions 134, 146, 156, 164:
136, 148, 158: notch 138:
166: circumferential flow path 172: inner cap
174: Outer channel 176: Inner outlet opening
180: Radial convex portion 182: Outside outlet opening
184: outer cap

Claims (14)

An adjustment unit having a cylinder unit including a piston body vertically movably mounted thereon and a microadjustment mechanism mounted on a base end side of the cylinder unit to vertically move the piston body; A liquid material source, a liquid material inlet for introducing the liquid material into the liquid material source, and an air inflow portion for introducing the compressed air in the compressed air source, an ejection nozzle having an opening communicating with the liquid body portion, A liquid material injection valve main body having a needle body which is fitted to the axial center of the discharge nozzle and whose tip reaches to the opening of the discharge nozzle, and a liquid material injection valve body having an adjustment for fixing the adjustment part and the fluid body part to prevent the adjustment part and the fluid body part from being separated from the cylinder part Characterized in that it comprises a member Liquid material injection valve for low flow rate exploded possible. The method according to claim 1,
Wherein the adjusting portion and the fluid body portion have an outer periphery on an annular shape, a recessed portion is provided on the outer periphery of the annular shape, and the restraining member has a binding member for binding the recessed portion, Wherein the liquid material injection valve body is fitted and supported by the restraining member. The method of claim 2,
Wherein said suppressing member has a base portion and first and second U-shaped binding members rotatably supported at the lower end of said base portion, wherein said liquid material spraying member is provided in a gap in a lower end portion of said first and second U- Shaped coupling member is inserted into a concave portion of an outer periphery of an annular shape of the fluid body portion by inserting the valve body so that an upper end portion of the first and second U- Wherein the liquid material injection valve body is fitted and supported by a restraining member so as to be engaged with a recessed portion of the outer periphery of the liquid material injection valve body. 4. The method according to any one of claims 1 to 3,
Wherein a liquid material discharge portion is provided in the fluid body portion, and the liquid material inlet portion and the liquid material discharge portion are communicated with each other so that an excess of liquid material introduced from the liquid material inlet portion is discharged from the liquid material discharge portion, And the liquid material is circulated and supplied so that the liquid material can be disassembled and assembled without a tool. The method according to any one of claims 1 to 4,
Wherein the liquid material is a filler-containing liquid material, and the liquid material injection valve for injecting the filler-containing liquid material is characterized in that the tip end of the needle material has a tapered shape, and the discharge nozzle has a right- The tip end of the needle body can be protruded from the tip of the discharge nozzle with the abutting annular sheet body having the abutment surface at the tip end so that the discharge amount of the filler containing liquid material can be adjusted by controlling the drawing of the needle body The liquid material injection valve for a low discharge amount capable of being disassembled and assembled without a tool. The method of claim 5,
Wherein the tip angle of the needle body is 5 to 30 degrees. The method according to any one of claims 1 to 4,
Wherein the liquid material is a filler-containing liquid material, and the liquid material injection valve for injecting the filler-containing liquid material is characterized in that the needle body has a tip tapered shape so that the discharge nozzle is in contact with a tip end of the needle body Wherein a tip end of the needle body is made to be unable to protrude from the tip of the discharge nozzle and a discharge amount of the filler-containing liquid material can be adjusted by controlling the drawing of the needle body. Liquid material injection valve for low discharge volume that can be disassembled without tools. The method of claim 7,
Wherein the tip angle of the needle body is 45 ° to 120 °. The method according to any one of claims 1 to 8,
Characterized in that an air cap for regulating a flow path of compressed air is provided under the opening of the discharge nozzle so as to form a flow of spray air when the liquid material is discharged, Possible low material injection valve for low discharge volume. The method of claim 9,
And the flow of the atomizing air is generated by an inner wall flow passage formed on an inner wall surface of the air cap. The method of claim 10,
Wherein the grooves are formed concentrically toward the outlet openings of the air cap and the notches corresponding to the grooves are formed in the outlet openings. Liquid material injection valve for low discharge volume. The method of claim 9,
Wherein the flow of the atomized air is generated by a peripheral flow passage formed around the outlet opening of the air cap. The method of claim 9,
Characterized in that the air cap has an inner cap and an outer cap, an outer circumferential flow path is radially formed on the outer circumferential surface of the inner cap, and the outer circumferential flow path is concentrated toward the outlet opening. Liquid material injection valve. The method according to any one of claims 1 to 13,
Wherein the atomizing air is mixed with the liquid material at the outlet opening of the air cap while being swirled and ejected.

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