TW201534403A - Method and apparatus for preventing liquid condensation in dispenser - Google Patents

Abstract

The present invention relates to an apparatus for preventing liquid condensation in a dispenser and a method for preventing liquid condensation in a dispenser, and more particularly, to an apparatus for preventing liquid condensation at a tip of a nozzle when liquids such as liquid crystal and paste are applied to a substrate and a method for operating the same. According to an exemplary embodiment of the present invention, a method for preventing liquid condensation in a dispenser includes: discharging a liquid through a nozzle of a syringe by providing a discharge supply pressure in a positive pressure form to a pressure supply pipe which is connected to the syringe; stopping the discharge of the liquid by providing a discharge stopping pressure in a first negative pressure form to the pressure supply pipe when the discharge of the liquid stops; and preventing the liquid condensation in the nozzle by stopping the discharge of the liquid and then providing a liquid condensation preventing pressure which is a second negative pressure smaller than the discharge stopping pressure to the pressure supply pipe.

Description

Method and apparatus for preventing condensation of liquid in a dispenser

The present invention relates to an apparatus for preventing agglomeration of a liquid in a dispenser and a method for preventing agglomeration of a liquid in the dispenser, and more particularly to a method for coating a liquid such as a liquid crystal or a paste Apparatus and method of operation for preventing liquid agglomeration at the tip of the nozzle when overlying the substrate.

A liquid crystal display (LCD) is manufactured by forming a plurality of primitive patterns on a single substrate, forming a color filter layer on another substrate opposite thereto, and combining the two glass substrates. And then liquid crystal is injected into the space by a predetermined method, which is formed by the combined two substrates and the inner sealant.

The operation for discharging the paste to the glass substrate in a predetermined pattern during the manufacture of the aforementioned liquid crystal display is performed by an apparatus for discharging the paste.

A discharge apparatus for discharging a paste to a flat substrate comprises: a platform on which an upper substrate and a lower substrate are seated; a dispenser including a syringe filled with a raw material (batter) and discharging the paste a nozzle to the substrate on the platform; a sensor, its measurement a gap between the substrate and the nozzle; a driver that raises the dispenser; a transfer portion that moves the dispenser horizontally; and a controller that controls the operation of the dispenser.

In order to form a pattern in the substrate using the discharge device, first, a gap between the substrate and the nozzle is measured using a sensor. In addition, the gap between the substrate and the nozzle is controlled by vertically moving the dispenser up and down. Next, the desired paste pattern is formed by moving the dispenser while discharging the material from the nozzle.

For example, when the paste pattern is formed on the edge of the substrate for a single panel, the paste pattern 20 has a shape as illustrated in FIG. As illustrated in FIG. 1, the paste pattern 20 has a shape that encloses the center of the substrate 10 from the edge of the substrate 10. Here, the paste pattern 20 is formed by a straight portion 23 located at the edge of the substrate 10 instead of each corner, the straight portion having a uniform width and height. In addition, the paste pattern 20 is formed by a curved portion 22 located at each corner of the substrate 10, penetrating the paste pattern 20, which has a uniform width and height.

Therefore, the paste is discharged from the starting point 21 as the origin, and then reaches the end point 24 immediately before the starting point 21, surrounding the straight portion 23 and the curved portion 22 to form the paste pattern 20.

However, after discharging the paste pattern, a waiting time for forming the next paste pattern is required. At this point, liquid agglomeration (droplets) occurs at the tip of the nozzle. Liquid agglomeration occurs because the raw material at the lower end of the nozzle coalesces due to the pressure generated by the residual height of the syringe. Therefore, liquid agglomeration occurs after waiting time has elapsed regardless of the viscosity of the raw material.

Due to the liquid agglomeration phenomenon, a large amount of raw materials are accidentally discharged at the starting point of the next paste pattern, so that the height of the pattern may be uneven as a whole.

In order to prevent liquid condensation, use a method for maintaining the residual pressure at a fixed value. A method or method for allowing the tip of the nozzle to contact other surfaces of the substrate to prevent liquid from being discharged from the nozzle. However, the method for maintaining the residual pressure at a fixed value has a problem that depending on the amount of liquid used, liquid agglomeration may still occur, and conversely, the liquid may be sucked into the nozzle. The method for allowing the tip of the nozzle to contact the surface of the substrate has the following problem that the periphery of the nozzle may be contaminated and the nozzle may be damaged.

[Related technical literature] [Patent Literature]

(Patent Document 1) Korean Patent Licensing Publication No. 10-2013-0007134

The present disclosure provides an apparatus and method for preventing liquid agglomeration in a nozzle of a syringe for a dispenser. In addition, the present disclosure prevents liquid from being drawn into the nozzle of the syringe for the dispenser after the liquid is discharged. The present disclosure provides an apparatus and method for preventing contamination of the periphery of a nozzle of a syringe.

According to an exemplary embodiment of the present invention, a method for preventing agglomeration of a liquid in a dispenser includes discharging a liquid through a nozzle of a syringe by supplying a discharge supply pressure to a pressure supply pipe connected to the syringe in a positive pressure form Preventing the discharge of the liquid by providing the discharge prevention pressure to the pressure supply pipe in the form of the first negative pressure in the event that it is desired to prevent the discharge of the liquid; and by preventing the discharge of the liquid and then the second negative pressure that is less than the discharge prevention pressure The liquid agglomeration protection pressure is supplied to the pressure supply tube to prevent liquid condensation in the nozzle.

The discharge of the liquid may include providing a positive pressure to the pressure supply pipe as a discharge supply pressure, which supplies the first negative pressure to the pressure supply pipe by turning off the atmospheric pressure valve that supplies the atmospheric pressure to the pressure supply pipe a valve and a second negative pressure valve that will provide a pressure less than the first negative pressure to the second negative pressure valve of the pressure supply tube, and the opening will be preset The positive pressure is supplied to the positive pressure valve of the pressure supply line.

The prevention of discharge of the liquid may include providing the first negative pressure to the pressure supply pipe as a discharge prevention pressure by closing the positive pressure valve, the second negative pressure valve, the atmospheric pressure valve, and opening only the first negative pressure valve.

Blocking the discharge of the liquid may include providing a first negative pressure to the pressure supply pipe as a discharge prevention pressure by closing the positive pressure valve, the first negative pressure valve, and the second negative pressure valve and opening only the atmospheric pressure valve The pressure supply pipe is switched to the atmospheric pressure state, and then only the first negative pressure valve is opened.

Prevention of liquid agglomeration in the nozzle may include providing a second negative pressure to the pressure supply pipe as a liquid agglomeration prevention pressure by closing the positive pressure valve, the atmospheric pressure valve, and the first negative pressure valve and opening only the second negative pressure valve.

The prevention of liquid agglomeration in the nozzle may include providing a differential pressure between the positive pressure and the first negative pressure to the pressure by closing the atmospheric pressure valve and the second negative pressure valve and opening only the positive pressure valve and the first negative pressure valve The supply tube acts as a liquid to prevent pressure.

The second negative pressure may be less than the first negative pressure. The first negative pressure may range from -20 Kpa to -10 Kpa, and the second negative pressure may range from -3 Kpa to -1 Kpa.

In accordance with another exemplary embodiment of the present invention, an apparatus for preventing condensation of liquid in a dispenser includes: a positive pressure valve configured to provide a predetermined positive pressure to a pressure supply tube; an atmospheric pressure valve, Configuring to provide atmospheric pressure to the pressure supply tube; a first negative pressure valve configured to provide a first negative pressure to the pressure supply tube; a second negative pressure valve configured to be less than the first negative pressure a second negative pressure is provided to the pressure supply pipe; the pressure supply pipe is configured to allow the positive pressure valve, the atmospheric pressure valve, the first negative pressure valve, and the second negative pressure valve to communicate with the syringe as a supply tube; and open and Closing the controller configured to close the positive pressure valve, the second negative when the liquid is prevented from being discharged from the syringe Pressing the valve and the atmospheric pressure valve and opening only the first negative pressure valve to supply the discharge prevention pressure to the pressure supply pipe in the form of the first negative pressure, and then closing the positive pressure valve, the atmospheric pressure valve and the first negative pressure valve and opening The second negative pressure valve supplies the second negative pressure to the pressure supply pipe as a liquid condensation prevention pressure.

In accordance with still another exemplary embodiment of the present invention, an apparatus for preventing liquid agglomeration of a dispenser includes: a positive pressure valve configured to provide a predetermined positive pressure to a pressure supply tube; an atmospheric pressure valve Configuring to provide atmospheric pressure to the pressure supply tube; a first negative pressure valve configured to provide a first negative pressure to the pressure supply tube; a second negative pressure valve configured to reduce the first negative pressure Two negative pressures are supplied to the pressure supply pipe; the pressure supply pipe is configured to allow the positive pressure valve, the atmospheric pressure valve, the first negative pressure valve, and the second negative pressure valve to communicate with the syringe as a supply pipe; and to open and close a controller configured to close the positive pressure valve, the second negative pressure valve, and the atmospheric pressure valve and only open the first negative pressure valve to block the discharge pressure in the first negative pressure form when the liquid is prevented from being discharged from the syringe Providing to the pressure supply pipe, and then closing the atmospheric pressure valve and the second negative pressure valve and opening the positive pressure valve and the first negative pressure valve to provide a differential pressure between the positive pressure and the first negative pressure to the pressure supply pipe Prevent coagulation liquid pressure.

The apparatus can further include: a pressure sensing sensor configured to check a pressure of the pressure supply tube; and a residual amount sensing sensor configured to sense a residual amount of liquid of the syringe.

Opening and closing the controller may check the pressure of the pressure supply pipe using a pressure sensing sensor in an atmospheric pressure state after the liquid is discharged, and check the residual amount of the liquid using the residual amount sensing sensor depending on the pressure supply pipe The pressure and residual amount of liquid will discharge to prevent pressure and liquid condensation from preventing pressure control to the desired pressure.

According to an exemplary embodiment of the present invention, it is possible to prevent a syringe for a dispenser The liquid in the nozzle agglomerates to minimize contamination around the nozzle. Therefore, the inconvenience of the nozzle cleaning operation can be solved. In addition, according to an exemplary embodiment of the present invention, the discharge response speed at the next discharge can be improved by preventing liquid from being sucked into the nozzle of the syringe.

10‧‧‧Substrate

20‧‧‧Battery pattern

21‧‧‧ starting point

22‧‧‧Bend section

23‧‧‧ Straight part

24‧‧‧ End point

30‧‧‧ platform

100‧‧‧Syringe

110‧‧‧Nozzles

200‧‧‧ valve module

210‧‧‧First negative pressure valve

220‧‧‧Second negative pressure valve

230‧‧‧Atmospheric pressure valve

240‧‧‧ positive pressure valve

310‧‧‧First negative pressure supply module

311‧‧‧First vacuum pump

312‧‧‧First Precision Vacuum Regulator

320‧‧‧Second negative pressure supply module

321‧‧‧Second vacuum pump

322‧‧‧Second precision vacuum regulator

330‧‧‧Positive pressure supply module

331‧‧‧Compressed generator

332‧‧‧High pressure compressor

333‧‧‧Proportional pressure control valve

410‧‧‧ Pressure Sensing Sensor

420‧‧‧Residual Sensing Sensor

500‧‧‧pressure supply tube

600‧‧‧Open and close the controller

S410‧‧‧Steps

S420‧‧‧ steps

S430‧‧‧Steps

FIG. 1 is a view illustrating an appearance of a paste pattern formed at an edge of a surface for a single panel.

Figure 2 is a perspective view of an apparatus for discharging a paste.

FIG. 3 is a diagram illustrating an apparatus for preventing agglomeration in a nozzle of a syringe, in accordance with an exemplary embodiment of the present invention.

4 is a flow chart illustrating a process of preventing condensation of liquid in a dispenser, in accordance with an exemplary embodiment of the present invention.

Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the invention is limited to the exemplary embodiments disclosed below, but can be embodied in a variety of different forms. These exemplary embodiments are only provided to be complete in the light of the present disclosure, and the scope of the present invention is fully understood by those skilled in the art. Elements in the figures may be exaggerated to describe the invention, and the same elements will be denoted by the same reference numerals.

Figure 2 is a perspective view of an apparatus for discharging a paste.

Hereinafter, although the present invention describes, for example, an apparatus for discharging a paste as an example of a dispenser, it is apparent that the present invention can be applied to discharge of various liquids in addition to the apparatus for discharging the paste. A device, for example, a device for discharging liquid crystals. Herein, examples of the liquid may include a liquid having a low viscosity (for example, water), a liquid having a high viscosity (for example, a liquid crystal, a sol, various mixed liquids, a slurry, and a paste) and Liquid mixture.

An exhaust apparatus according to an exemplary embodiment of the present invention includes a platform 30 on which a substrate is seated and a dispenser including the syringe 100, the syringe 100 having a nozzle 110 through which a paste of a raw material is discharged The substrate 10 on the platform 30 is formed to form a paste pattern 20.

The substrate S may be any of an upper substrate and a lower substrate used in a liquid crystal display panel. In this case, although not illustrated in the upper substrate, for example, a color filter and a common electrode are formed on the upper substrate, and, for example, a thin film transistor and a picture electrode are formed on the lower substrate. In addition, when a liquid crystal display panel is formed by bonding an upper substrate and a lower substrate, a plurality of patterns P made of a metal paste may be formed on any of the upper substrate and the lower substrate to be on the upper substrate and the lower substrate. Conduction. According to an exemplary embodiment of the present invention, for example, a silver (Ag) paste is used as a paste stored in the syringe 100 for a dispenser and discharged onto the substrate S.

The syringe 100 is moved in the X-axis and Y-axis directions by the transfer unit to form a pattern P on the substrate S. In this case, the platform 30 and the syringe 100 are moved (driving motion) by a driving device such as an electric motor and a rail. Of course, various devices other than this can be used. The plurality of syringes 100 can be moved (driving motion) by a single drive. Here, the drive unit can be controlled by a single transfer unit to drive all of the syringes 100 simultaneously.

The case where the syringe 100 is horizontally moved in the X-axis and Y-axis directions has been described above. However, the present invention is not limited thereto, and thus the stage 30 is movable in the X-axis and Y-axis directions to discharge the paste to the substrate 10. In addition, both the platform 30 and the syringe 100 are movable in the X-axis and Y-axis directions to discharge the paste, and the platform 30 is moved in one axial direction and the syringe 100 is movable in the other axis direction to discharge It is a liquid paste.

Although not illustrated, the dispenser includes a distance sensor (not illustrated). A distance sensor is mounted to be spaced apart from the nozzle 110 to measure a gap between the nozzle 110 and the substrate 10. The distance sensor is configured with a light emitting unit (not illustrated) that emits light toward the substrate 10 and a light receiving unit (not illustrated) that receives light emitted from the light emitting unit (not illustrated). In this case, the light emitting unit (not illustrated) and the light receiving unit (not illustrated) are configured as one body and may be disposed to be spaced apart from each other by a predetermined distance. In addition, the syringe 100 is raised and lowered based on the measured value measured by the distance sensor, and thus the gap between the substrate 10 and the nozzle 110 can be controlled to, for example, 40 μm.

However, after discharging the paste pattern, it is necessary to form a waiting time for the next paste pattern. At this point, liquid agglomeration (droplets) occurs at the tip of the nozzle. Liquid agglomeration occurs because the paste at the lower end of the nozzle coalesces due to the pressure generated by the residual height of the raw material in the syringe 100.

In order to prevent liquid agglomeration at the end of the nozzle, an exemplary embodiment of the present invention checks the residual amount of the paste remaining in the syringe 100 after the discharge of the paste, and performs control to maintain the syringe for each step. The internal pressure of 100, thereby preventing liquid agglomeration due to the residual amount of the paste. This will be described with reference to FIG.

3 is a diagram illustrating an apparatus for preventing condensation of liquid in a nozzle of a syringe, in accordance with an exemplary embodiment of the present invention.

The syringe 100 filled with the paste is mounted to a head unit (not illustrated) that configures the dispenser, and the nozzle 110 is mounted below the syringe 100. The paste filled in the syringe 100 is discharged to the outside through the nozzle 110, and thus the substrate 10 on the stage 30 is formed with a paste pattern. A residual amount sensing sensor 420 that senses a residual amount of liquid in the syringe can be coupled to the syringe 100.

Apparatus for preventing agglomeration of liquid in a dispenser comprising a valve module 200, Opening and closing are performed for determining whether pressure is supplied in the syringe 100 and the pressure supply tube 500 that connects the valve module 200 to the syringe 100. The valve module 200 includes a positive pressure valve 240 that provides a predetermined positive pressure to the pressure supply tube 500, an atmospheric pressure valve 230 that provides atmospheric pressure to the pressure supply tube 500, and a first negative pressure valve 210 that will The first negative pressure is supplied to the pressure supply pipe 500; and the second negative pressure valve 220 supplies the second negative pressure to the pressure supply pipe 500.

The positive pressure valve 240 is opened and closed for determining whether to supply an inert gas (for example, Ar, N ₂ gas) supplied from the positive pressure supply module 330 to the pressure supply pipe at a set pressure in the form of a positive (+) pressure. 500. When the positive pressure valve 240 is opened, a positive pressure inert gas is supplied to the pressure supply pipe 500, and when the positive pressure valve 240 is closed, the positive pressure through the positive pressure valve 240 is not supplied to the pressure supply pipe 500. The positive (+) pressure is a predetermined pressure and is provided by the positive pressure supply module 330. In this case, positive pressure means a pressure equal to or greater than any reference or normal pressure. For example, when the reference pressure is zero (0), positive pressure means a pressure equal to or greater than zero. The positive pressure supply module 330 may include a compression generator 331, a boost pressure compressor 332, and a proportional pressure control valve 333. When the compression generator 331 generates a predetermined pressure to supply the inert gas to the elevated pressure compressor 332, the elevated pressure compressor 332 supplies the inert gas to the proportional pressure control valve 333, thereby increasing the pressure of the inert gas to 1 MPa, And the proportional control valve 333 controls the inert gas increased to 1 MPa to a set positive pressure (for example, about 0 to 10 Kpa) and supplies the controlled inert gas to the inlet of the positive pressure valve 240.

The atmospheric pressure valve 230 is opened and closed for determining whether atmospheric pressure is supplied to the pressure supply pipe 500. When the atmospheric pressure valve 230 is opened, the pressure supply pipe 500 is maintained at outdoor atmospheric pressure, and when the atmospheric pressure valve 230 is turned off, the outdoor atmospheric pressure is not supplied to the pressure supply pipe 500.

The first negative pressure valve 210 is opened and closed for determining whether the first negative pressure is supplied from the first negative pressure supply module 310 to the pressure supply pipe 500. When the first negative pressure valve 210 is opened, the first negative pressure is supplied to the pressure supply pipe 500, and when the first negative pressure valve 210 is closed, the first negative pressure through the first negative pressure valve 210 is not supplied to Pressure supply tube 500. The first negative (-) pressure has a set first negative pressure value. In this case, the negative pressure means a pressure less than any reference or normal pressure. For example, when the normal pressure is zero (0), the negative pressure means a pressure less than zero, that is, a negative pressure. The first negative pressure is provided by the first negative pressure supply module 310. The first vacuum supply module 310 can include a first vacuum pump 311 and a first precision vacuum regulator 312. When the first vacuum pump 311 generates the first negative pressure, the accuracy vacuum regulator 312 controls the first negative pressure to a desired first negative value (eg, a first negative pressure of -20 Kpa to -10 Kpa), and will be controlled. The first negative pressure is supplied to the inlet of the first negative pressure valve 210.

The second negative pressure valve 220 is opened and closed for determining whether a second negative pressure that is less than the micro negative pressure of the first negative pressure supplied from the first negative pressure valve 210 is supplied from the second negative pressure supply module 320. To the pressure supply pipe 500. When the second negative pressure valve 220 is opened, the second negative pressure is supplied to the pressure supply pipe 500, and when the second negative pressure valve 220 is turned off, the second negative pressure through the second negative pressure valve 220 is not supplied to Pressure supply tube 500. The second negative pressure has a set second negative pressure value and is provided by the second negative pressure supply module 320. In this case, the second negative pressure is a pressure compared to the first negative pressure described above, and is smaller than the first negative pressure as a negative value. That is, the absolute value of the second negative pressure is smaller than the absolute value of the first negative pressure. Therefore, the second negative pressure is even weaker under the force applied to the object in the negative direction as compared with the first negative pressure. The second negative pressure supply module 320 may include a second vacuum pump 321 and a second precision vacuum regulator 322. When the second vacuum pump 321 generates a negative pressure, the second accuracy vacuum regulator 322 generates a second negative pressure that is less than the pressure of the first negative pressure (eg, is a micro-negative pressure) The second negative pressure of -3 Kpa to -1 Kpa) and the resulting second negative pressure is supplied to the inlet of the second negative pressure valve 220. For reference, the positive pressure valve 240, the atmospheric pressure valve 230, the first negative pressure valve 210, and the second negative pressure valve 220 may be implemented as electromagnetic electronic valves.

The pressure supply pipe 500 is a supply pipe through which the positive pressure valve 240, the atmospheric pressure valve 230, the first negative pressure valve 210, and the first negative pressure valve 220 communicate with the syringe 100 as a supply pipe. Therefore, the pressure in the pressure supply pipe 500 depends on whether the positive pressure valve 240, the atmospheric pressure valve 230, the first negative pressure valve 210, and the first negative pressure valve 220 are each opened to change, and thus affects the connection to the pressure supply. The exhaust pressure of the paste within the syringe 100 of the tube 500. Therefore, the pressure in the pressure supply tube 500 is equal to the pressure applied to the paste in the syringe 100. In addition, a pressure sensing sensor 410 that senses the pressure in the pressure supply tube 500 may be further provided.

The opening and closing controller 600 supplies a discharge supply pressure in a positive pressure form to the pressure supply pipe 500 of the syringe 100 to control the positive pressure valve 240, the atmospheric pressure valve 230, the first negative pressure valve 210, and the first negative pressure valve 220, respectively. In order to discharge the liquid through the nozzle 110 of the syringe 100. That is, in the case where it is desired to discharge the paste through the syringe 100, the opening and closing controller 600 turns off the atmospheric pressure valve 230, the first negative pressure valve 210, and the second negative pressure valve 220 and opens only the positive pressure valve 240. The discharge supply pressure in the form of a positive pressure is supplied to the pressure supply pipe 500.

In addition, the opening and closing controller 600 is controlled by the following two methods for preventing the discharge of the paste in order to prevent the paste from being sucked into the inside of the nozzle while preventing the paste from being discharged.

The first method for preventing the paste from being sucked into the nozzle while preventing the paste from being discharged first turns off the positive pressure valve 240, the second negative pressure valve 220, the atmospheric pressure valve 230, and opens only the first negative pressure valve 210. In order to prevent the pressure from being discharged in the form of the first negative pressure It is supplied to the pressure supply pipe 500, thereby preventing the liquid from being discharged. In order to prevent the paste discharged through the nozzle, only the first negative pressure valve 210 is opened to supply a first negative pressure ranging from -20 Kpa to -10 Kpa to the pressure supply pipe 500 as a discharge prevention pressure. Next, in order to prevent the liquid in the nozzle from agglomerating, the positive pressure valve 240, the atmospheric pressure valve 230 and the first negative pressure valve 210 are closed and only the second negative pressure valve 220 is opened to supply the second negative pressure to the pressure supply pipe 500. , as a liquid condensation prevention pressure that is less than the discharge prevention pressure. The second negative pressure valve 220 is opened to supply a second negative pressure ranging from -3 Kpa to -1 Kpa to the pressure supply pipe 500 as a liquid agglomeration preventing pressure to prevent the paste from being sucked into the nozzle while preventing The liquid paste is discharged from the nozzle 110 of the syringe 100.

Further, the second method for preventing the paste from being sucked into the nozzle while preventing the paste from being discharged first turns off the positive pressure valve 240, the second negative pressure valve 220, the atmospheric pressure valve 230, and opens only the first negative pressure. The valve 210 supplies the discharge prevention pressure to the pressure supply pipe 500 in the form of the first negative pressure, thereby preventing the liquid from being discharged. Next, the atmospheric pressure valve 230 and the second negative pressure valve 220 are closed and the positive pressure valve 240 and the first negative pressure valve 210 are opened to provide a differential pressure between the positive pressure and the first negative pressure to the pressure supply tube 500, The liquid agglomeration prevention pressure is less than the discharge prevention pressure. The differential pressure between the positive pressure and the first negative pressure is generated in the pressure supply tube 500. For example, a pressure of -3 Kpa to -1 Kpa which is a differential pressure obtained by adding a first negative pressure of -20 Kpa to -10 Kpa to a positive pressure of 0 Kpa to 17 Kpa can be maintained in the pressure supply pipe 500 as a liquid Condensation prevents stress. In the case of the first method, it is necessary to convert the first negative pressure state to the second negative pressure, and therefore, the response speed is relatively low. On the other hand, as in the second method, the discharge of the liquid is stopped and then the positive pressure is added to immediately provide the liquid agglomeration prevention pressure as the positive pressure and the first negative pressure and the differential pressure, thereby making the response preventing the discharge of the paste The speed is getting faster.

At the same time, the opening and closing controller 600 can control the discharge to prevent pressure and liquid condensation. Gather to prevent stress. In the atmospheric pressure state after discharging the liquid, the opening and closing controller 600 calculates the pressure of the pressure supply pipe 500 using the pressure sensing sensor 410, and calculates the paste in the syringe using the residual amount sensing sensor 420 (liquid The residual amount is controlled to the desired pressure by the discharge preventing pressure and the liquid agglomeration preventing pressure depending on the pressure of the pressure supply pipe 500 and the residual amount of the paste. For example, in the atmospheric pressure state in which the liquid is not discharged, when the first negative pressure of the pressure supply pipe 500 is checked to be reduced, the paste can be discharged, and thus the liquid agglomeration preventing pressure can be further increased. In contrast, in the atmospheric pressure state in which the liquid is not discharged, when the pressure of the pressure supply pipe 500 is checked to have a high first negative pressure as a negative value, the paste can be introduced into the nozzle in turn and thus can be further lowered Liquid condensation prevents stress.

4 is a flow chart illustrating a process of preventing condensation of liquid in a dispenser, in accordance with an exemplary embodiment of the present invention.

The process of discharging the liquid through the nozzle of the syringe 100 by supplying the discharge supply pressure to the pressure supply pipe 500 connected to the syringe 100 in a positive pressure form is performed (S410). In the case where it is desired to discharge the liquid, the atmospheric pressure valve 230 that supplies atmospheric pressure to the pressure supply pipe 500 is turned off, the first negative pressure valve 210 that supplies the first negative pressure to the pressure supply pipe 500, and will be less than the first negative The second negative pressure of the pressure is supplied to the second negative pressure valve 220 of the pressure supply pipe 500, and only the positive pressure valve 240 that supplies the predetermined positive pressure to the pressure supply pipe 500 is opened to supply the positive pressure to the pressure supply Tube 500 acts as a discharge supply pressure.

In order to prevent liquid agglomeration in the nozzle by preventing the discharge of the paste when the paste which is a liquid is applied through the nozzle of the syringe 100, first, the discharge prevention pressure in the form of the first negative pressure is supplied to the pressure supply pipe 500. To prevent the discharge of the paste (S420). The positive pressure valve 240, the second negative pressure valve 220, and the atmospheric pressure valve 230 are turned off and only the first negative pressure valve 210 is opened to supply the first negative pressure to the pressure supply tube 500 as a discharge stop pressure. The first negative pressure has a size ranging from -20 Kpa to -10 Kpa to destroy the paste in the syringe 100 and the discharged paste. However, the process of converting the exhaust pressure state to the atmospheric pressure state before applying the first negative pressure may be performed first. That is, the positive pressure valve 240, the first negative pressure valve 210, and the second negative pressure valve 220 are turned off and only the atmospheric pressure valve 230 is opened to convert the pressure supply tube 500 into an atmospheric pressure state, and then only the first negative pressure valve is opened. 210, thereby supplying the first negative pressure to the pressure supply pipe 500 as the discharge prevention pressure. The discharge pressure in the positive pressure form is immediately converted into the first negative pressure. The discharge prevention pressure can affect the peripheral device such as the valve, and thus the process of converting the exhaust pressure into the atmospheric pressure state and then the discharge prevention pressure can be performed.

After the paste is prevented from blocking the nozzle of the syringe 100, a process of providing a liquid agglomeration preventing pressure which is a pressure smaller than the discharge preventing pressure as an absolute value to prevent the liquid in the nozzle from agglomerating and preventing the paste from being introduced into the inside of the nozzle is performed. (S430). Even when the first negative pressure having a size of -20 Kpa to -10 Kpa is continuously supplied after the discharge is stopped, there is a problem that the paste is introduced into the nozzle in turn. Therefore, in order to prevent the above problem, after the discharge of the paste is stopped, the liquid agglomeration preventing pressure smaller than the first negative pressure is supplied to prevent the liquid in the nozzle from agglomerating and to prevent the paste from being introduced into the nozzle in reverse.

The method for preventing the paste from being sucked into the inside of the nozzle while preventing the paste from being discharged can be formed by the following two methods.

A first method for preventing the paste from being drawn into the nozzle while preventing the paste from being discharged turns off the positive pressure valve 240, the atmospheric pressure valve 230 and the first negative pressure valve 210 and opens only the second negative pressure valve 220 The second negative pressure is supplied to the pressure supply pipe 500 as a liquid condensation prevention pressure smaller than the discharge prevention pressure. The second negative pressure valve 220 is opened to supply a second negative pressure ranging from -3 Kpa to -1 Kpa to the pressure supply pipe 500 as a liquid coagulation preventing pressure to prevent the paste from being sucked into the nozzle while preventing A paste that is a liquid is discharged from the nozzle 110 of the syringe 100.

Further, a second method for preventing the paste from being sucked into the nozzle while preventing the paste from being discharged turns off the atmospheric pressure valve 230 and the second negative pressure valve 220 and opens the positive pressure valve 240 and the first negative pressure valve 210. The differential pressure between the positive pressure and the first negative pressure is supplied to the pressure supply pipe 500 as a liquid condensation prevention pressure smaller than the discharge prevention pressure. For example, a positive pressure range ranging from 0 Kpa to 17 Kpa and a first negative pressure from -20 Kpa to -10 Kpa are used, and thus a pressure of -3 Kpa to -1 Kpa is generated as a differential pressure therebetween, which can be supplied to the pressure The supply pipe 500 serves as a liquid agglomeration preventing pressure. The discharge of the liquid is stopped, and then a positive pressure is supplied to immediately provide the liquid agglomeration prevention pressure as the differential pressure between the positive pressure and the first negative pressure, thereby making the response speed of preventing the discharge of the paste faster.

The invention is described with reference to the drawings and the foregoing exemplary embodiments, but is not limited thereto, and is limited by the appended claims. The present invention can be variously changed and modified by those skilled in the art without departing from the technical spirit of the claims to be described below.

10‧‧‧Substrate

30‧‧‧ platform

100‧‧‧Syringe

110‧‧‧Nozzles

200‧‧‧ valve module

210‧‧‧First negative pressure valve

220‧‧‧Second negative pressure valve

230‧‧‧Atmospheric pressure valve

240‧‧‧ positive pressure valve

310‧‧‧First negative pressure supply module

311‧‧‧First vacuum pump

312‧‧‧First Precision Vacuum Regulator

320‧‧‧Second negative pressure supply module

321‧‧‧Second vacuum pump

322‧‧‧Second precision vacuum regulator

330‧‧‧Positive pressure supply module

331‧‧‧Compressed generator

332‧‧‧High pressure compressor

333‧‧‧Proportional pressure control valve

410‧‧‧ Pressure Sensing Sensor

420‧‧‧Residual Sensing Sensor

500‧‧‧pressure supply tube

600‧‧‧Open and close the controller

Claims (13)

A method for preventing agglomeration of a liquid in a dispenser, comprising: discharging a liquid through a nozzle of the syringe by supplying a discharge supply pressure to a pressure supply pipe connected to the syringe in a positive pressure form; In the case of a liquid, the discharge of the liquid is prevented by providing a discharge prevention pressure to the pressure supply pipe in a first negative pressure form; and by preventing the discharge of the liquid and then going to be less than A liquid agglomeration preventing pressure of a second negative pressure that discharges the prevention pressure is supplied to the pressure supply pipe to prevent the liquid in the nozzle from agglomerating. The method of claim 1, wherein the discharging of the liquid comprises supplying the positive pressure to the pressure supply pipe as the discharge supply pressure, which provides atmospheric pressure to the An atmospheric pressure valve of the pressure supply pipe, a first negative pressure valve that supplies a first negative pressure to the pressure supply pipe, and a second negative pressure that is a pressure smaller than the first negative pressure to the pressure supply pipe a second negative pressure valve, and a positive pressure valve that opens a predetermined positive pressure to the pressure supply tube. The method of claim 2, wherein the preventing the discharge of the liquid comprises closing the positive pressure valve, the second negative pressure valve, the atmospheric pressure valve, and only opening the first A negative pressure valve supplies the first negative pressure to the pressure supply pipe as the discharge prevention pressure. The method of claim 3, the preventing the discharge of the liquid comprising providing the first negative pressure to the pressure supply pipe as the discharge prevention pressure, which is turned off by The positive pressure valve, the first negative pressure valve, and the second negative pressure valve and only opening the atmospheric pressure valve to switch the pressure supply tube to an atmospheric pressure state, and then only opening the first negative Pressure valve. The method of claim 2, wherein the preventing the condensation of the liquid in the nozzle comprises: closing the positive pressure valve, the atmospheric pressure valve, and the first negative pressure valve and only The second negative pressure valve is opened to supply the second negative pressure to the pressure supply pipe as the liquid agglomeration prevention pressure. The method of claim 2, wherein the preventing the condensation of the liquid in the nozzle comprises: closing the atmospheric pressure valve and the second negative pressure valve and opening the positive pressure valve and The first negative pressure valve supplies a differential pressure between the positive pressure and the first negative pressure to the pressure supply pipe as the liquid agglomeration prevention pressure. The method of any one of claims 2 to 6, wherein the second negative pressure is less than the first negative pressure. The method of claim 7, wherein the first negative pressure ranges from -20 Kpa to -10 Kpa. The method of claim 7, wherein the second negative pressure ranges from -3 Kpa to -1 Kpa. An apparatus for preventing condensation of liquid in a dispenser, comprising: a positive pressure valve configured to provide a predetermined positive pressure to a pressure supply tube; an atmospheric pressure valve configured to provide atmospheric pressure to the a pressure supply tube; a first negative pressure valve configured to provide a first negative pressure to the pressure supply tube; a second negative pressure valve configured to reduce a second negative pressure less than the first negative pressure Provided to the pressure supply pipe; the pressure supply pipe configured to connect the positive pressure valve, the atmospheric pressure valve, the first negative pressure valve, and the second negative pressure valve to a syringe a supply tube; and an opening and closing controller configured to turn off the positive pressure valve, the second negative pressure valve, and the atmospheric pressure valve when the liquid is prevented from being discharged from the syringe And opening only the first negative pressure valve to block the discharge pressure in the form of the first negative pressure Providing to the pressure supply pipe, and then turning off the positive pressure valve, the atmospheric pressure valve, and the first negative pressure valve and opening the second negative pressure valve to provide the second negative pressure to The pressure supply pipe serves as a liquid agglomeration preventing pressure. An apparatus for preventing condensation of liquid in a dispenser, comprising: a positive pressure valve configured to provide a predetermined positive pressure to a pressure supply tube; an atmospheric pressure valve configured to provide atmospheric pressure to the a pressure supply tube; a first negative pressure valve configured to provide a first negative pressure to the pressure supply tube; a second negative pressure valve configured to reduce a second negative pressure less than the first negative pressure Provided to the pressure supply pipe; the pressure supply pipe configured to connect the positive pressure valve, the atmospheric pressure valve, the first negative pressure valve, and the second negative pressure valve to a syringe a supply tube; and an opening and closing controller configured to turn off the positive pressure valve, the second negative pressure valve, and the atmospheric pressure valve when the liquid is prevented from being discharged from the syringe And opening only the first negative pressure valve to provide a discharge prevention pressure to the pressure supply pipe in a first negative pressure form, and then closing the atmospheric pressure valve and the second negative pressure valve and opening the Positive pressure valve Said first negative pressure valve to the pressure difference between the pressure of the first negative pressure supplied to the pressure supply tube to prevent a liquid pressure agglomeration. The apparatus of claim 10, further comprising: a pressure sensing sensor configured to check a pressure of the pressure supply tube; and a residual amount sensing sensor configured to sense The residual amount of the liquid of the syringe is measured. The apparatus of claim 12, wherein the opening and closing controller checks the pressure supply tube using the pressure sensing sensor in an atmospheric pressure state after the liquid is discharged Pressure, and sensing sensing using the residual amount The residual amount of the liquid is checked to control the discharge prevention pressure and the liquid condensation prevention pressure to a desired pressure depending on the pressure of the pressure supply pipe and the residual amount of the liquid.