JP2009247994A - Applicator of coating liquid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an applicator of a coating liquid which applies a coating liquid with a necessary minimum coating amount on the upper face of a plate such as a rectangular and flat glass plate, resin panel and the like without coating unevenness and without intrusion of the coating liquid into the rear face side. <P>SOLUTION: The applicator of the coating liquid is composed by arranging a plurality of nozzles for supplying a coating liquid in parallel and in a constant pitch to the width direction perpendicular with the conveying direction of the glass plate, then connecting each of them with a tube respectively via an electromagnetic valve that stops freely to supply the coating liquid from the coating liquid tank to each nozzle respectively and arranging a needlelike needle part that discharges the coating liquid at each distal end portion of the needle part to the perpendicular direction to the glass plate. The film thickness on the glass surface is uniformalized by conducting the leveling in a conveying state of the glass plate and expanding the area of each belt-like application surface until the gap disappears mutually after applying the coating liquid so that each belt-like application surface becomes parallel with a distance of approximately a/4-a/30 wherein a is the width of each belt-like application surface immediately after the application formed on the upper surface from the leading edge to the rear edge of the glass plate by discharging the coating liquid from the needle part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for uniformly applying a coating liquid with a minimum amount of coating liquid without generating a back surface of the coating liquid on the surface of a plate-like body such as a glass plate or a resin panel. It is a coating liquid application apparatus useful for uniformly forming a film used for anti-fogging, anti-frosting and the like.

  Conventionally, when a coating solution such as a coating solution is applied to a plate-like body such as a glass plate or a resin panel, a method of applying the coating solution with a brush, a method of spray-coating with a nozzle, or a curtain for applying a shower with a slit-shaped nozzle Various methods and devices are known, such as the flow coating method, the spin coating method that spreads the coating liquid by rotating the plate-like body, or the method of applying the coating liquid that adheres to the rotating rubber roll by transferring it to the plate-like body. ing.

  As a method of spray coating with a nozzle, for example, in Japanese Patent Application Laid-Open No. 2007-175663, a coating film forming method for forming a coating film on a coating film forming surface of a substrate, the coating film forming surface of the substrate is a predetermined surface with respect to a vertical surface. A holding step for holding the substrate at an angle, an injection step for injecting a coating liquid from the plurality of nozzles onto the film forming surface, and the plurality of nozzles on the film forming surface while injecting the coating liquid. A film forming method comprising: a moving step of moving at least one of the plurality of nozzles and the base material so as to be relatively moved with respect to the substrate (Patent Document 1).

  Alternatively, as a method of performing shower coating with a slit-shaped nozzle, for example, in Japanese Patent Application Laid-Open No. 2006-175421, a substrate mounting stage is disposed at the center between a pair of parallel rails, and is orthogonal to the rails in plan view. With reference to the center line in the width direction of the substrate mounting stage, the first and second gate-type moving mechanisms are bridged on the left and right objects so as to be able to travel independently between the rails. A coating apparatus is disclosed in which a slit nozzle is held by a moving mechanism so as to be movable up and down (Patent Document 2).

  Alternatively, as a spin coating method in which the plate-like body is rotated to spread the coating liquid, for example, in JP 09-164364 A, a coating liquid for film formation is dropped on the center of the surface of the workpiece W, The coating liquid is spread evenly on the surface of the workpiece W. At this time, a part of the coating liquid for forming the coating is wrapped around the lower surface of the outer end of the workpiece W, but it is conveyed to the reduced pressure drying apparatus 3 as it is and dried to a certain extent. Next, the object to be processed is transferred onto the chuck 42 of the cleaning spinner 4 by the transfer device 6, and the object W to be processed is rotated at a high speed while adsorbed by the chuck 42, and the cleaning liquid is ejected from the nozzle 43 to the lower surface. A film forming method is disclosed which is characterized by wrapping around and washing off a coating solution that has solidified to some extent (Patent Document 3).

Alternatively, as a nozzle coating method for applying a coating liquid discharged from a nozzle to a substrate or the like, for example, in Japanese Patent Application Laid-Open No. 09-092134, in a state of being separated from a planar application surface of an object to be coated. Then, while discharging the coating liquid from the tip of the nozzle, the nozzle is moved relatively in parallel with the coating surface to apply the coating liquid to the coating surface in a line, and the next coating line A nozzle coating method is disclosed in which a coating surface is formed by sequentially and repeatedly coating so that a part in the width direction of the film overlaps the previous coating line in the width direction (Patent Document 4).
JP 2007-175663 A JP 2006-175421 A JP 09-164364 A JP 09-092134 A

  The invention disclosed in Patent Document 1 is a method of spray coating using a nozzle, and supports the upper end side of the film-forming surface of the glass plate in a suspended state and is directed to the opposite vertical side from the vertical side of one side of the glass plate. Since the application liquid is applied by moving a plurality of nozzles and applying the application liquid along the glass plate surface, the application liquid applied by the lower nozzle is applied. There has been a problem that the coating liquid applied by the nozzle on the upper side is applied again on the surface, and the film thickness cannot be made constant.

  Moreover, what is shown by the said patent document 2 is conveyed since it is the method of applying a coating liquid from the slit nozzle part which has a elongate slit part from the upper direction of the glass substrate conveyed by a horizontal attitude | position. The coating solution tends to flow from the edge of the glass substrate to the lower surface side, or some coating solutions can easily absorb moisture in the air. In the case of handling, while recovering and circulating the coating liquid dropped from the glass plate surface, it absorbs moisture in the air, causing the performance of the coating liquid to deteriorate, or causing lint in the air to adhere easily There was a point.

  Further, in the invention disclosed in Patent Document 3, since the spin coating method is used to spread the coating liquid by rotating the plate-like body, the coating liquid more than the number of coating liquids to be coated on the glass substrate is supplied. However, since the surplus coating liquid is dropped by centrifugal force, when the coating liquid is collected and circulated, when handling the coating liquid in which moisture absorption becomes a problem in quality, the above-mentioned patent document As in the case of the invention shown in Fig. 2, when the water is circulated and absorbs moisture in the air, the problem of reducing the performance of the coating solution occurs, and the glass substrate is rectangular. However, there is a problem in that the back of the coating liquid easily occurs on the lower surface side from the edge portion.

  Further, in the invention disclosed in Patent Document 4, a nozzle is driven in the X direction (direction perpendicular to the glass plate conveyance direction) to form a coating line, and then in the Y direction (glass plate conveyance direction). The next coating line is formed by moving by a pitch P smaller than the width of the coating line, and the coating surface is formed by forcibly sequentially coating the entire surface of the glass substrate so as to partially overlap in the adjacent width direction. Therefore, when the area of the glass plate is increased, it takes time to apply the entire surface, and there is a problem that the control becomes complicated.

  The present invention aims to solve the above problems, that is, use a coating liquid that easily absorbs moisture in the air on the upper surface of a plate-like body such as a rectangular flat glass plate or resin panel with a simple configuration. The purpose is to apply a coating film with a minimum required coating amount with a coating efficiency of 100% without causing the coating liquid to be formed on the back side of the glass plate, and to form a uniform film. To do.

That is, the present invention is an apparatus for applying a coating liquid on the upper surface of a rectangular glass plate that is conveyed at a constant speed in a horizontal posture on a conveying roll.
A plurality of nozzles for supplying the coating liquid are arranged in parallel at a constant pitch in the width direction orthogonal to the conveying direction of the glass plate, and each nozzle is connected via an electromagnetic valve that can freely stop the supply of the coating liquid from the coating liquid tank. Each of the nozzles is connected to a nozzle, and a needle-like needle portion for discharging the coating liquid is disposed at each tip of the nozzle in a direction perpendicular to the glass plate surface, and the coating liquid is discharged from the needle portion. When the width of the belt-like coating surface immediately after coating formed on the upper surface between the front end and the rear end of the glass plate is a, the strip-shaped coating surfaces are parallel to each other at an interval of approximately a / 4 to a / 30. A coating solution comprising leveling means for leveling in a transported state of the glass plate after coating and expanding the area of each strip-shaped coating surface until there is no gap between them to make the film thickness on the glass surface uniform. It is a coating device.

  Alternatively, the present invention is characterized in that the coating liquid tank and the needle portion of the nozzle are shielded from the moisture of the outside air to form a sealed system structure, and the coating liquid once discharged from the needle is not circulated and used. This is a coating liquid coating apparatus.

  Alternatively, in the present invention, the inner diameter of the needle-shaped needle portion is 0.5 to 3.0 mm, the length is 5 to 30 mm, the distance from the lower end of the needle portion to the upper surface of the glass plate is 5 to 150 mm, The above-described coating liquid coating apparatus is characterized in that the interval between the needle portions arranged in parallel is set to 5 to 100 mm.

  Alternatively, the present invention is the coating liquid coating apparatus described above, wherein the plurality of needle portions are arranged in a zigzag shape or a staggered shape in the width direction of the glass plate.

  Alternatively, the present invention is the above-described coating solution coating apparatus, wherein each nozzle has a position adjusting unit that can adjust the position in the width direction on a rail provided in the width direction.

  Alternatively, according to the present invention, the position of the tip of the glass plate in the conveyance direction is detected by the position detecting means, and the length is approximately ½ of the interval between the adjacent belt-like application surfaces immediately after application applied by ejection from the needle part. The coating liquid is then applied by a controller that starts the application by opening the solenoid valve from the inside position from the front end of the glass plate, and closes the solenoid valve at a position that is approximately the same length as the interval from the rear end and stops the application. Any one of the above-described coating liquid coating apparatuses.

  Alternatively, in the present invention, as the leveling means, fine vibration applying means for forcibly applying fine vibration to the glass plate on the transport roll is attached, and the fine vibration applying means is provided by mechanical vibration means or ultrasonic vibration means. The coating liquid coating apparatus according to any one of the above, wherein the spread of the area of the belt-shaped coating surface is promoted.

  In the present invention, a rectangular and flat glass plate or resin panel or other plate-like body has an upper surface of a plate-like body, and the coating liquid is formed in parallel lines at equal intervals by a plurality of nozzles spaced apart at a constant pitch in the width direction of the glass plate. The coating surface of a plurality of strip-shaped coating strips applied by a simple configuration of providing a strip-shaped coating strip is flattened by leveling until the gap between adjacent strip-shaped coating strips is eliminated and leveled. The coating solution can be applied uniformly without coating unevenness.

  In addition, a plurality of nozzles spaced apart at a constant pitch on the glass plate surface are provided with a strip-like coating strip of parallel stripes, so that a larger amount of coating solution is required compared to the dip coating method or curtain flow coating method. Furthermore, there is no loss of coating solution, and the coating efficiency is very high at almost 100%.

  Furthermore, since the coating liquid tank to the needle part of the nozzle are shielded from moisture in the outside air to form a sealed system structure, the applied liquid can be applied almost 100%, so that the curtain flow coating method or spin coating method can be used. There is no need to collect and use the coating liquid, and there is no alteration of the coating liquid due to the absorption of moisture in the air as in the case of collecting and circulating the coating liquid. The environment can be maintained, and the quality of the coating solution can be constantly maintained.

  As shown in FIG. 1, the coating means 10 includes a plurality of nozzles 11 for supplying a coating liquid at a constant pitch in the width direction orthogonal to the conveying direction of the glass plate G, and each of the nozzles 11, 11,. Each of them is connected to a nozzle 11, 11,... Via a solenoid valve 13 that can freely stop the supply of the application liquid from the application liquid tank 15.

  At the tip of each nozzle 11, 11,..., A needle-like needle portion 12 that discharges the coating liquid is disposed in a direction perpendicular to the glass plate G surface in a horizontal posture, and coating from the needle portion 12 is performed. If the width of each of the strip-shaped application surfaces 2, 2,... Formed on the upper surface between the front end and the rear end of the glass plate G by discharging the liquid is a, the strip-shaped application surfaces 2, 2,. It is applied so as to be parallel at an interval of / 4 to a / 30. At this time, the glass plate G is horizontally and accurately arranged, and the needle portion 12 is provided in a direction perpendicular to the surface of the glass plate G.

  As shown in FIG. 2, when a plurality of strip-like application surfaces 2 are formed in parallel on the upper surface of the glass plate G by the application means 10, the glass plate G is being conveyed by the leveling means during the conveyance of the glass plate G. Leveling the coating solution on each of the belt-like coating surfaces 2, 2,... On the G surface, expanding the coating area, and stretching the area of each belt-like coating surface 2, 2,. The film thickness of the coating solution on the G surface is made uniform.

  The coating liquid tank 15 placed in the pressurized tank 16 to the needle portion 12 of the nozzle 11 has a sealed structure in which moisture from outside air is blocked as much as possible, and the coating liquid once discharged from the needle portion 12 is not circulated. The structure. Furthermore, the air sent into the pressurized tank 16 through the pipe 17 connected to the pressurized tank 16 was dry and clean air.

  The nozzle 11 is made of stainless steel (SUS304), the hole inner diameter of the needle-like needle portion 12 is 0.5 to 3.0 mm, the length of the needle portion 12 is 5 to 30 mm, and the glass plate extends from the lower end of the needle portion 12. It is preferable that the distance to the upper surface of G is 5 to 150 mm, and the interval between the needle parts 12, 12,.

  The reason why the hole inner diameter of the needle-shaped needle portion 12 is preferably in the range of 0.5 to 3.0 mm is to control the coating amount applied on the surface of the glass plate G and the width of the belt-shaped coating surface. If it is too thin, there is a risk of clogging or scattering of the coating liquid due to an increase in coating pressure. If it is too thick, it may be difficult to control the discharge rate, or depending on the viscosity of the coating liquid, This is because the liquid stoppage at the time of liquid stoppage becomes worse and the remaining amount of the coating liquid in the needle portion may fall at an unintended position.

  The length of the needle portion 12 is preferably in the range of 5 to 30 mm. If the length is shorter than 5 mm, it is difficult to set the needle portion in the vertical direction. For this reason, it is convenient to make the length a little longer, but if it exceeds 30 mm and is too long, it is necessary to bend the needle part or increase the size of the peripheral device of the needle part. Because there is a risk of becoming.

  The distance from the lower end of the needle portion 12 to the upper surface of the glass plate G is set to 5 to 150 mm. If the thickness of the glass plate is changed to less than 5 mm, the needle portion may come into contact with the glass plate. For this reason, the height of the needle portion must be adjusted. On the other hand, if the height exceeds 150 mm, the coating liquid tends to be scattered when the coating liquid is applied to the glass plate.

  The interval between the needle sections 12, 12,... Arranged in parallel is preferably set to 5 to 100 mm because the coating liquid is evaporated after the viscosity of the coating liquid to be handled or the coating liquid is supplied to the glass plate. This is because the width of the belt-like application surface immediately after application discharged and formed from each needle portion is a (5 to 100 mm), nothing is applied between adjacent belt-like application surfaces. This is because the non-applicable portion is narrowed by leveling the coated surface, and the strip-shaped coated surface is spread over the entire surface, so that the entire surface of the glass plate G can have a uniform thickness.

  In addition, it is important to arrange | position a glass plate horizontally, and a uniform film | membrane can be formed by making it horizontal. Moreover, it is necessary to provide each needle part so as to be perpendicular to the glass surface. This is because, when the needle portion is inclined, it is difficult to uniformly apply the coating liquid onto the glass plate surface, and as a result, there is a risk of running out of liquid or film unevenness.

  As shown in FIG. 1 and FIG. 2, a plurality of needle portions are arranged in a row. However, as shown in FIG. 3, two rails provided in the width direction are provided, and a plurality of needle portions are provided on the two rails. May be arranged alternately in a zigzag or zigzag pattern in the width direction of the glass plate.

  When the interval of the belt-shaped coating liquid is set to be narrower than the width of the solenoid valve, the solenoid valves cannot be arranged in a line on one rail as shown in FIGS. Thus, if it arrange | positions in the zigzag shape or zigzag-leg shape in the width direction of a glass plate like this, the space | interval of the width direction between the needle parts of the nozzle attached to a solenoid valve can be narrowed.

  Each of the nozzles 11, 11,... Is provided with a guide (not shown) that is slidable on a rail provided in the width direction, and an electromagnetic valve is attached and fixed to the guide so that the nozzles 11, 11,. Position adjustment means is provided that can adjust the sliding movement in the direction. In addition, each nozzle 11, 11,... Can be adjusted in the height direction by a vertical hole provided in an attachment member attached on the guide.

  Further, the position of the tip of the glass plate G in the transport direction provided in the vicinity of the upstream position of the plurality of nozzles arranged in parallel is detected by a position detecting means 40 including a sensor 41 and the like, and the needle portions 12, 12,. The coating is started by opening the electromagnetic valve from the inner side of the front end of the glass plate by a length approximately half of the interval between the adjacent strip-shaped coating surfaces immediately after coating applied by discharging the coating liquid. The coating liquid is applied onto the glass plate surface by a controller (not shown) which stops the application by closing the electromagnetic valve at a position in front of substantially the same length as the interval.

  The controller (not shown) of the coating apparatus 1 detects each leading edge of the glass plate G by the sensor 41 and then sets each solenoid valve according to a timer or conveyance movement distance that is set and stored in the controller for each dimension of the glass plate G in advance. Is controlled, and the timing at which each solenoid valve 13, 13,... Is closed is controlled. Further, among the electromagnetic valves 13, 13,... Arranged in parallel at a plurality of places, the electromagnetic valves 13, 13,.

  If the transport speed of the transport roll 51 is constant, it can be handled by controlling the timer, but the transport speed may vary slightly depending on the campaign, so the transport distance of the glass plate G is generated by a rotary encoder (not shown). The front end position and the rear end position are accurately determined by counting the number of pulses to be transmitted.

  The detection sensor 41 at the front end of the glass plate G is arranged upstream of the position of the nozzles 11, 11,... And after the sensor 41 detects the rear end of the glass plate G, only a / 4 from the rear end edge. The electromagnetic valves 13, 13,... Can be closed at the front (inward direction of the glass plate) position.

  As shown in FIGS. 4 to 6, as the leveling means 20, a belt-like coating applied to the upper surface of the glass plate G on the transport roll 51 during the transport by reducing the speed of the transport roll 51 after the application. The liquid surface 2 gradually spreads by its own weight, and the adjacent belt-like coating liquid surfaces 2,... Are closely joined to each other by the slight vibration of the transport roll 51, and the margin part on the front end side rear end side of the glass plate G surface In addition, the coating surface may spread to form a coating liquid surface with a uniform thickness on the entire glass plate G surface.

  As another embodiment of the leveling means 20, a fine vibration device for forcibly giving a fine vibration to the glass plate G on which a plurality of strip-like coating surfaces 2, 2,. (Not shown), for example, by applying fine vibrations by ultrasonic waves to promote the spread of the application area of the band-shaped application surface, or by attaching a fine vibration device to the transport roll itself to promote the expansion of the area of the band-shaped application surface You may do it.

  The preferred embodiment has been described above, but the present invention is not limited to this, and various applications can be considered.

  Although the glass plate G is a flat plate, a single plate such as a tempered glass plate, a semi-tempered glass plate, an unstrengthened float (commonly referred to as a green plate), a plurality of tempered glasses, or a tempered glass An intermediate film such as PVB or EVA combined with green glass or laminated glass bonded by resin injection may be used. Furthermore, the present invention can be applied not only to the glass plate G but also to various panel materials such as a resin plate.

Hereinafter, a coating liquid coating apparatus 1 according to the present invention will be described in detail with reference to the drawings.
[Example 1]
As shown in FIG. 1 and FIG. 2, an attachment attached to a slide-movable guide 32 provided on a rail 31 provided in the width direction of the glass plate G in accordance with the width of the glass plate G positioned in the previous step. The mounting position of the nozzles 11, 11,... Is adjusted by a member (not shown), and a glass plate indicating which of the plurality of application nozzles 11, 11,. Settings are registered for each G.

  Furthermore, when it is necessary to adjust the height of the nozzle 11 due to the thickness of the glass plate G or the like, the position of the height direction in the vertical direction is determined by the elongated hole of the mounting member (not shown) mounted on the guide 32. Adjustment is possible.

  As shown in FIG. 1 and FIG. 2, in order to form the coating liquid 2 on the glass plate G positioned by the glass plate positioning device in the previous process (not shown), the glass plate is moved by the transport roll 51 of the transport means 50. G is conveyed. When the glass plate G approaches the vicinity of the nozzles 11, 11,..., The glass plate detection sensor 41 is activated.

  The glass plate detection sensor 41 detects the front end of the glass plate, and after a predetermined time, the glass plate G passes under the nozzle and reaches the position set by several mm upstream from the front end of the glass plate. Each of the plurality of electromagnetic valves 13 is opened, and the application liquid starts to be dripped from the needle portion 12 of each nozzle 11.

  In the setting where the width a of the belt-like application surface immediately after application discharged by the nozzle is 24 mm and the nozzles are arranged in parallel at a constant pitch of 28 mm, the distance between adjacent belt-like application surfaces is 4 mm. Each of the solenoid valves set in advance at the upstream position (inside of the glass plate) by 2 mm corresponding to 1/2 of the interval is opened, and the coating liquid starts dripping from the needle portion of each nozzle. Then, as shown in FIGS. 5 and 6, a parallel strip-shaped coating strip 2 is formed.

  Next, as shown in FIG. 2, a plurality of nozzles are arranged in parallel at a constant pitch of 28 mm in the width direction of the glass plate, and the width a immediately after application of the belt-like coating surface discharged from the needle portion of each nozzle is 24 mm. When the glass plate is further transported and approaches the rear end, the solenoid valve for each nozzle is closed at a position 2 mm from the rear end of the glass plate corresponding to 1/2 of the above-mentioned distance. Then, dripping of the coating liquid from the needle portion stops.

  After the rear end of the glass plate G passes just below the discharge position of the nozzle 11, it is conveyed to the leveling zone. In the leveling zone, when the conveyance speed of the glass plate is lowered and about 2 minutes have passed under the environment of 24 ° C., the film spreads over the entire surface of the glass plate as shown in FIG. 6, and an antifogging film is formed.

  In addition, the glass plate was arrange | positioned so that it might remain horizontal, and each needle part was also provided so that it might become a perpendicular | vertical direction to a glass surface.

  The material of the needle part of each nozzle is made of stainless steel (SUS304), the inner diameter is 1.4 mm, the discharge pressure is 0.05 MPa, the flow rate is 2.2 g / sec, and the conveying speed of the glass plate is 0.4 m. / Sec.

  In this way, the coating liquid is not sprayed on the entire upper surface of the glass plate G, but is sprayed from the inside of the front end of the glass plate G to the inside of the rear end with several parallel strip-shaped coating strips provided at intervals. As a result, the coating liquid does not flow around the edge end face or the lower surface of the glass plate G, and the discharged coating liquid can be used 100%, and the coating liquid overflowing from the glass plate surface is recovered and reused. Since there is no need, the possibility of absorbing moisture in the air of the coating liquid as when the coating liquid is recovered and used is eliminated, and the performance of the anti-fogging film is not deteriorated due to moisture absorption. Could be formed.

[Example 2]
As shown in FIG. 3, two rails 31 for supporting the coating nozzles are provided, and the plurality of nozzles 11 are alternately arranged on the two rails 31, 31 so as to zigzag in the width direction of the glass plate G. Or arranged in a staggered pattern. In this case, the application start timing of each of the nozzles 11, 11,... Can correct the distance to the position of the sensor 41 for each nozzle so that the application liquid can be applied from a predetermined application position at the tip of the glass plate. I made it.

  By adopting such nozzle installation, it has become possible to arrange the interval between the nozzles at an interval narrower than the width of the electromagnetic valve.

[Example 3]
As the leveling means, as a fine vibration imparting means for forcibly giving a fine vibration to the glass plate on the transport roll, an ultrasonic wave is applied to the belt-like coating liquid on the glass plate surface by an ultrasonic device (not shown). did. In this case, a stationary time of several seconds was provided after the irradiation of ultrasonic waves was stopped. Thereby, the expansion of the area of the belt-like application surface can be promoted.

The front view of the coating device of this invention. The top view of the coating device of this invention. The top view of another embodiment of the coating device of this invention. The side view of the glass plate explaining the coating device of this invention. The front view of the glass plate explaining the coating device of this invention. The top view of the glass plate explaining the coating device of this invention.

Explanation of symbols

G glass plate 1 coating device 2 strip-shaped coating surface (coating solution)
DESCRIPTION OF SYMBOLS 10 Application | coating means 11 Nozzle 12 Needle part 13 Electromagnetic valve 14 Tube 15 Coating liquid tank 16 Pressure tank 20 Leveling means 30 Position adjustment means 31 Rail 32 Guide 40 Position detection means 41 Sensor 50 Conveyance means 51 Conveyance roll

Claims (7)

In an apparatus for applying a coating liquid on the upper surface of a rectangular glass plate that is transported at a constant speed in a horizontal posture on a transport roll,
A plurality of nozzles for supplying the coating liquid are arranged in parallel at a constant pitch in the width direction orthogonal to the conveying direction of the glass plate, and each nozzle is connected via an electromagnetic valve that can freely stop the supply of the coating liquid from the coating liquid tank. Each is connected to a nozzle with a tube, and at each tip of the nozzle, a needle-like needle part for discharging the coating liquid is arranged in a direction perpendicular to the glass plate surface,
Assuming that the width of the belt-like coating surface immediately after coating formed on the upper surface between the front end and the rear end of the glass plate by discharging the coating liquid from the needle portion is a, the belt-like coating surfaces are approximately a / 4 to a / Leveling means for leveling in the state of conveyance of the glass plate after coating so as to be parallel at an interval of 30 and expanding the area of each band-like coating surface until there is no gap between them, and uniforming the film thickness on the glass surface; A coating liquid coating apparatus comprising:   2. The coating liquid according to claim 1, wherein the coating liquid tank and the needle portion of the nozzle are shielded from moisture of the outside air to form a sealed system structure, and the coating liquid once discharged from the needle is configured not to be circulated. Coating device.   The inner diameter of the needle-shaped needle portion is 0.5 to 3.0 mm, the length is 5 to 30 mm, the distance from the lower end of the needle portion to the upper surface of the glass plate is 5 to 150 mm, and between the needle portions arranged in parallel The coating liquid coating apparatus according to claim 1, wherein the distance between the coating liquid and the coating liquid is 5 to 100 mm.   4. The coating liquid coating apparatus according to claim 1, wherein the plurality of needle portions are arranged in a zigzag shape or a staggered shape in the width direction of the glass plate.   5. The coating liquid coating apparatus according to claim 1, wherein each of the nozzles includes a position adjusting unit that can adjust a position in a width direction on a rail provided in the width direction.   The tip position of the glass plate is detected by the position detection means by the position detection means, and the tip of the glass plate is approximately half the distance between the adjacent strip-like coating surfaces immediately after coating applied by ejection from the needle part. The application liquid is applied by a controller that starts application by opening the electromagnetic valve from a more inner position and closes the electromagnetic valve at a position closer to the front than the rear end by a solenoid valve and stops application. 6. A coating liquid coating apparatus according to any one of 1 to 5.   As the leveling means, a fine vibration applying means for forcibly applying fine vibration to the glass plate on the transport roll is attached, and as the fine vibration applying means, the area of the belt-like coating surface is adjusted by mechanical vibration means or ultrasonic vibration means. 7. The coating liquid coating apparatus according to claim 1, wherein spreading is promoted.

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