JP5573751B2 - Coating head cleaning device and cleaning method - Google Patents

Description

  The present invention relates to a method for cleaning a paste adhering to an ejection port and an ejection surface of an application head and an improvement of an application head cleaning device.

  In recent years, the spread of thin displays such as liquid crystal displays has increased. Many of these are so-called pixels in which a large number of small pixels are formed and an image is formed by electrically controlling the color and brightness of each pixel. Type display. An AC type plasma display can be given as an example of such a display.

  In the plasma display, a structure having various functions such as pixel partitioning is formed. The structure is provided to ensure a uniform discharge space at the same time as suppressing the spread of discharge to a certain area and performing display in a prescribed cell, and is called a partition (also referred to as a barrier or rib). Yes. The shape of the partition generally includes a stripe shape or a lattice shape having a width of 20 to 120 μm and a height of 50 to 250 μm.

The phosphor layer is formed as a phosphor paste mainly composed of phosphor powder, an organic binder and an organic solvent, and is applied between predetermined barrier ribs and dried. Since this phosphor paste contains phosphor powder at a high concentration, it often has a high viscosity of 10,000 mPa · s or more.
As a method for applying the phosphor paste between predetermined barrier ribs, there are a screen printing method, a dispenser method, and the like, and a dispenser method with little material loss is attracting attention.
The dispenser method uses a device called a coating head having a discharge port for discharging paste, and applies the paste between the partition walls while moving the discharge port facing the substrate.

  In the case of a plasma display, a phosphor paste is applied between the barrier ribs. In this case, there are many single-wafer systems in which coating is performed for each substrate, and coating starts and ends for each substrate. After applying one substrate, the paste adheres to the discharge port and discharge surface of the coating head. If the next substrate is applied in this state, the discharge flow of the paste discharged from the discharge port is disturbed. , Accurate application between the predetermined partition walls is not possible. Therefore, in order to maintain stable ejection accuracy, it is necessary to clean the ejection port and ejection surface of the coating head every time after the application is completed.

  As such a coating head cleaning method, conventionally, as shown in the schematic diagram of FIG. 7, a method of scraping and cleaning excess paste or the like adhering to the discharge port and the discharge surface with a scraper made of an elastic body such as rubber. (See Patent Document 1) and a schematic diagram of FIG. 8, a method of wiping sliding by moving the wiping material such as a soft cloth supported by the pressing means and the coating head relative to each other (see Patent Document 2) Etc. are known.

  However, in these methods, for example, in the case of a phosphor paste for plasma display, the phosphor powder of hard inorganic fine particles contained in the phosphor paste acts like an abrasive, and the discharge surface of the coating head is It is shaved. As a result, as shown in the schematic view of the ejection surface in FIG. In addition, the wiping damage becomes deeper as the number of wiping increases. If the depth of wiping scratches exceeds a certain limit, a coating defect occurs and high-quality coating cannot be performed. If the coating head becomes unusable due to the wiping scratches, it is necessary to newly manufacture the coating head, resulting in a problem of increased costs and a problem that production efficiency deteriorates because it takes time to replace the coating head.

On the other hand, as another cleaning method, a technique is known in which an adhesive tape having a solvent absorption capability as shown in the schematic diagram of FIG. Yes. (See Patent Document 3 and Patent Document 4)
However, in the cleaning methods described in Patent Documents 3 and 4, since there is a wrinkle-stretching bar 18 of the adhesive tape, it is possible to prevent wrinkling of the adhesive tape caused by tension, but in a long section (width) on the elastic body. Since the pressure-sensitive adhesive tape is wound, a negative pressure is generated between the pressure-sensitive adhesive tape and the elastic body when the coating head is peeled off after contact, and the pressure-sensitive adhesive tape and the elastic body may not be peeled off. Therefore, there is a problem that the adhesive tape cannot be quickly peeled off from the coating head and the cleaning effect is reduced. For this reason, the paste remains in the vicinity of the discharge port of the coating head, resulting in coating defects.

JP 2004-14393 A JP 2002-126599 A JP 2010-29836 A International Publication No. W02008 / 149758 Pamphlet

  An object of the present invention is to provide an application head cleaning device and a cleaning method for efficiently and inexpensively cleaning paste adhering to an ejection port and an ejection surface of an application head using an adhesive tape.

  In order to achieve the above object, the present invention is a coating head cleaning device that removes a coating liquid adhering to the vicinity of a discharge port of a coating head having a plurality of discharge ports arranged substantially in a row against an adhesive tape. If the direction in which the discharge ports are arranged is the Y direction, the direction in which the application head is pressed against the adhesive tape is the Z direction, and the direction perpendicular to both is the X direction, the application head is attached to the adhesive tape. When pressing, there is an elastic body that supports the tape from the opposite side of the adhesive surface of the adhesive tape, and an adjusting means that is disposed on both sides in the X direction of the elastic body and adjusts the contact state between the adhesive tape and the elastic body. The width W in the X direction of the contact region S where the elastic body and the adhesive tape contact each other is 30 times to 1 times the opening width D of the discharge port before the application head is pressed against the adhesive tape. 0 times, in the X direction on both sides of the contact region S, to provide a coating head cleaning apparatus characterized by having a gap area where the adhesive tape and the elastic member are not in contact.

  It is preferable to have wrinkle stretching means for preventing wrinkles of the adhesive tape.

  A coating head cleaning method for cleaning a coating head using the coating head cleaning device according to claim 1, wherein the coating head is pressed against and brought into contact with the adhesive tape supported by the elastic body. It is preferable that the adhesive tape is peeled off from the coating head by moving it in the direction opposite to the direction pressed against the body, and the coating liquid adhering to the vicinity of the discharge port is transferred to the adhesive tape.

  According to the present invention, since the coating liquid remaining on the discharge port and the discharge surface of the coating head can be reliably removed, there are few effects of coating and there are preferable effects of improving productivity.

It is the schematic which shows the cross section of the coating head cleaning apparatus in the preferable example of the coating head cleaning apparatus of this invention. It is the schematic which shows a series of operation | movement of the coating head cleaning method of this invention. It is the schematic which shows the cross section of the pressing part of the coating head cleaning apparatus which becomes outside the range of this invention since W is smaller than 30D. It is the schematic which shows the cross section of the pressing part of the coating head cleaning apparatus which becomes outside the range of this invention since W is larger than 150D. It is the schematic which shows the cross section of the pressing part in the preferable example of the coating head cleaning apparatus of this invention. It is the schematic which shows the cross section of the pressing part in the other preferable example of the coating head cleaning apparatus of this invention. It is the schematic which showed an example of the conventional coating head cleaning apparatus and the coating head cleaning method. It is the schematic which showed the other example of the conventional coating head cleaning apparatus and the coating head cleaning method. It is the schematic which showed the other example of the conventional coating head cleaning apparatus and the coating head cleaning method. It is a schematic diagram of the abrasion near the discharge outlet of the coating head which generate | occur | produces when the conventional coating head cleaning apparatus is used.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings. However, the present invention is not limited to this. The apparatus structure of this invention is demonstrated using the schematic of the cleaning apparatus cross section shown in FIG. The inside of the coating head 1 is filled with a phosphor paste 3, and a gas pressure such as compressed air is flowed from the pressurizing pipe 2, and the phosphor paste 3 is ejected from the ejection port 5 for coating. In this figure, the coating process and the coating apparatus are not shown. After application, the phosphor paste 3 adheres to the discharge surface around the discharge port 5.

  A plurality of discharge ports 5 are provided in the coating head 1 and are arranged in a substantially line in the Y direction (direction perpendicular to the cross section shown in FIG. 1). The shape of the discharge port 5 may be any shape such as a slit, a circle, an ellipse, or a polygon, but when the coating head 1 is a phosphor coating head for plasma display, it is approximately circular. Preferably there is. When the discharge port 5 is circular, the diameter is preferably about 50 to 200 μm. Here, the opening width in the X direction of the discharge port is defined as the opening width D of the discharge port.

  A plurality of discharge ports 5 are provided as described above. In the plasma display, the number of pixels in the scanning direction is set so that the phosphor layer necessary for one screen can be applied by one discharge for each of R, G, and B colors. It is preferable that the corresponding number (about 1000 to 4000) is arranged in a line in the Y direction. In the present invention, “arranged in substantially one row” means a state in which all the discharge ports are arranged so as to lie on one straight line.

  The cleaning device shown in FIG. 1 has a cleaning function configured in an upper frame 6 that is an upper structure, and a drive function configured in a lower frame 7 that is a lower structure.

  The upper frame 6 is provided with an adhesive tape 8, an unwinding roll 9, a winding roll 10, and a pressing part 13. If the upper frame 6 is configured to be detachable / transferable from the lower frame 7, it is preferable that the adhesive tape 8 wound in a roll shape can be prepared by external setup. The adhesive tape 8 is unwound from the unwinding roll 9, passes through the pressing portion 13, and is wound up by the winding roll 10.

  The unwinding roll 9 and the winding roll 10 are driven by an unwinding motor 11 and a winding motor 12 installed on the lower frame 7, and the motor torque and rotational speed of the unwinding motor 11 and the winding motor 12 are adjusted. By controlling the pressure-sensitive adhesive tape 8, the pressure-sensitive adhesive tape 8 can be wound up while applying tension to the pressure-sensitive adhesive tape 8.

Here, the direction in which the ejection ports 5 of the coating head 1 are arranged is the Y direction, the direction in which the coating head 1 is pressed against the adhesive tape 8 is the Z direction, and the direction perpendicular to both is the X direction.
The pressing portion 13 includes an elastic body 14, a support column 15, and a gap adjusting bar 16 that is an adjusting unit that adjusts the contact state between the adhesive tape 8 and the elastic body 14. By adjusting the attachment position of the gap adjustment bar 16, the gap 17 formed between the elastic body 14 and the adhesive tape 8 and the width W in the X direction of the contact region S where the adhesive tape 8 and the elastic body 14 are in contact with each other are set. adjust.

  FIG. 2 is a schematic view of a cross section of the cleaning device showing a series of operations of the embodiment of the present invention.

  FIG. 2 a) shows a state before the application head 1 with excess paste attached to the ejection surface 4 is pressed against the adhesive tape 8.

  FIG. 2 b) shows a state where the application head 1 is pressed against the adhesive tape 8. In FIG. 2b), from the state of FIG. 2a), the coating head 1 to which the phosphor paste 3 is adhered is pushed vertically into the adhesive tape 8 supported on the elastic body 14 from the back side and held in that state for several seconds. The solvent component in the paste is absorbed by the adhesive layer, and the phosphor paste is solidified.

  As the elastic body 14, a known material can be appropriately used as long as it has appropriate elasticity, but a rubber material that is inexpensive and excellent in workability and durability is preferable. The rubber hardness is preferably A20 to A60 degrees (JIS K 6253 (2006)). When the angle is smaller than A20 degrees, the contact pressure for fixing the phosphor paste becomes insufficient. On the other hand, if it is larger than A60 degrees, the elasticity is impaired, a uniform contact pressure cannot be obtained, and the coating head 1 is easily damaged, which is not preferable. More preferably, A is 30 to 50 degrees.

As the rubber material, various rubber materials can be used as appropriate, but a material that does not easily deteriorate even if a paste adheres is preferable. An antifouling coating or a cover film may be provided.
If the elastic body has a large variation in the hardness of the rubber, a uniform contact pressure cannot be obtained. Therefore, the variation in the hardness is preferably small, and preferably 10 degrees or less. More preferably, it is 5 degrees or less.
Next, regarding the shape accuracy of the elastic body, it is preferable that the straightness of the contact surface between the elastic body and the coating head is 0.5 mm or less because uniform contact pressure can be easily obtained. It is still more preferable if it is 0.2 mm or less.

The rubber thickness of the elastic body is preferably 1 to 30 mm, and more preferably 5 to 15 mm. If it is smaller than 1 mm, the elasticity is impaired and an appropriate contact pressure cannot be obtained. If it is larger than 30 mm, unnecessary materials increase and the apparatus becomes large, which is uneconomical.
The shape of the elastic body is preferably a convex contact surface with the coating head because the pressure around the discharge port can be reliably contacted. In this case, the contact pressure is started in the vicinity of the discharge ports arranged in a row, and then is expanded to the periphery of the discharge port, which is preferable because the spread of the paste is made uniform.

  Further, it is preferable that the shape of the abutting surface is a part of the cylindrical surface, since the processing of the abutting surface becomes easy and as a result, straightness is improved.

  The diameter of the cylindrical surface is preferably 10 to 1000 mm. If it is less than 10 mm, the position of the discharge port is likely to deviate from the top of the cylinder, and an appropriate contact pressure cannot be obtained at the discharge port. If it is larger than 1000 mm, the convex effect is weakened, and a portion where the contact pressure is insufficient tends to occur, which is not preferable. The diameter of the cylindrical surface is more preferably 20 to 100 mm. It is more preferable that the apex of the cylindrical surface is aligned with the position of the discharge port, so that the contact pressure becomes uniform.

  The holding time for pressing and holding the coating head into the elastic body is preferably 0.1 to 10 seconds. If the holding time is shorter than 0.1 seconds, the phosphor paste cannot be solidified sufficiently. If it is longer than 10 seconds, the paste is excessively solidified and cannot be peeled off from the discharge surface, which is not preferable. Preferably, it is 0.5 seconds to 5 seconds.

Next, FIG. 2 c) shows a state in which the coating head 1 is lifted vertically from FIG. 2 b), and the adhesive tape 8 is also lifted while sticking to the ejection surface 4 of the coating head 1.
Next, FIG. 2d) shows a state where the adhesive tape 8 has been peeled off from the coating head 1 and the cleaning has been completed. The adhesive tape is peeled off from the coating head at high speed by the high tension of the pressure-sensitive adhesive tape 8 applied by the torque motor of the unwinding motor 11, and the phosphor paste 3 attached to the vicinity of the discharge port 5 of the coating head 1 is adhered to the pressure-sensitive adhesive tape. 8 is transferred.

  Although it does not specifically limit as tension | tensile_strength provided to an adhesive tape, 10-1000 N / m is preferable. If it is less than 10 N / m, the running of the adhesive tape becomes unstable, sagging and wrinkles are likely to occur, and the coating head is likely to be unevenly pushed. If it is higher than 1000 N / m, high tension is applied, which increases the load on the apparatus and tears the adhesive tape.

  It is preferable that the clearance adjustment bar 16 for adjusting the clearance 17 adjusts the clearance simply by adjusting the vertical and horizontal directions. The gap adjusting bar 16 is preferably as close to the elastic body 14 as possible, but is preferably in close contact with the elastic body 14 as shown in FIG.

  This gap 17 prevents the adhesive tape from adsorbing to the elastic body due to negative pressure when proceeding from FIG. 2b) to FIG. 2c), that is, has a function of negative pressure destruction. The inventors raised the adhesive tape 8 while sticking to the discharge surface of the application head when the application head is lifted, and it is preferable that the adhesive tape peels from the application head at a high speed of 1000 mm / s or more due to the tension of the adhesive tape. It was found to be important for performing proper transcription. When there is no gap due to the gap adjustment bar 16, there is no function of destroying the negative pressure, so that the adhesive tape is peeled off from the coating head while sticking to the supported elastic body. Therefore, it cannot be peeled off at high speed due to the tension of the adhesive tape, and the solidified phosphor paste cannot be transferred to the adhesive tape.

  In addition, the width W in the X direction of the contact region S where the elastic body and the back side of the adhesive tape are in contact with each other before the application head is pressed by adjusting the gap adjustment bar 16 is 30 to 150 of the opening width D of the discharge port. It is necessary to be double, and more preferably 50 to 100 times.

  When W is smaller than 30 times D (FIG. 3), when the coating head is pressed against the elastic body and the paste spreads, contact pressure cannot be instantaneously obtained at the gap between the elastic body and the adhesive tape, and transfer is performed. Leftover occurs. When W is larger than 150 times D (FIG. 4), when the coating head is pressed against the elastic body, a negative pressure is generated between the adhesive tape and the elastic body, and the adhesive tape and the elastic body are adsorbed in a sucker state. It becomes easy to peel off and cannot be peeled off at high speed.

  Moreover, as shown in FIG. 5, it is preferable to have a wrinkle stretching bar 18 as means for stretching the wrinkles of the adhesive tape. The wrinkle stretching bars 18 are preferably provided on both upstream and downstream sides of the pressing portion. Further, it is more preferable that the wrinkle stretching bar 18 has an arcuate curvature in the width direction of the adhesive tape. When there is no curvature, since both ends of the adhesive tape are stretched by tension, the center of the adhesive tape is wrinkled, which is not preferable.

  Moreover, as shown in FIG. 6, it is preferable to install the gap adjusting bar 16a as one member having both the gap adjusting function and the wrinkle extending function, because the adjustment becomes easier and more reliable.

The pressure-sensitive adhesive tape applicable to the present invention can be appropriately selected and used so as to correspond to a wide variety of coating liquid types and adhesion amounts. The pressure-sensitive adhesive tape is preferably composed of a base material and a pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer is more preferably a pressure-sensitive adhesive tape composed of a solvent-absorbing pressure-sensitive adhesive. This is because if the pressure-sensitive adhesive can absorb the paste or the solvent contained in the paste, the fluidity of the paste is lowered, and it becomes extremely easy to peel and transfer. For this purpose, it is preferable whether the solubility parameter of the adhesive is close to that of the paste or paste solvent. The solvent absorption capacity of the pressure-sensitive adhesive tape is preferably 10 mL or more, more preferably 20 mL or more per 1 m ^{2 of} area. When the solvent absorption capacity is less than 10 mL per 1 m ² , there is a tendency that residual solvent absorption tends to occur. In addition, the solvent absorption capability of the adhesive tape said here is the value which immersed for 1 minute in the solvent which comprises a coating liquid, and measured the weight increased by absorption.

The solvent absorption rate of the pressure-sensitive adhesive tape is preferably 1 mL / second or more, more preferably 3 mL / second or more per 1 m ^{2 of} area. If the solvent absorption rate is less than 1 mL / ^second per 1 m ² , the paste solvent absorption takes too much time and the cleaning time becomes longer, which is not preferable. The solvent absorption rate of the adhesive tape is a value measured by immersing the tape in the solvent constituting the coating solution for 5 seconds, and absorbing the solvent component to increase the weight per unit area and per unit time. is there.

  Furthermore, the adhesive strength of the adhesive tape is important to have adhesive strength even after absorption of the solvent in the paste, and is preferably 0.5 to 4.0 N per 20 mm width, and is 2.0 to 3.0 N. More preferably. If the adhesive strength per 20 mm width is less than 0.5 N, the solidified product remaining after absorbing the solvent in the paste remaining on the ejection surface tends to be completely removed, which is not preferable. Moreover, when it exceeds 4.0 N, it takes time for tape peeling, and there exists a tendency for an adhesive layer to peel from the base material of an adhesive tape, and is unpreferable. The adhesive strength of the adhesive tape was measured by pasting it with a PET film having a thickness of 25 μm and peeling it in a 180 ° direction at 23 ° C. and a pulling speed of 300 mm / min by a method according to JIS Z 0237 (2000). Value.

  Moreover, it is preferable that the thickness of the adhesion layer of the said adhesive tape is 0.005-0.3 mm, and it is more preferable that it is 0.01-0.15 mm. If the thickness of the adhesive layer is less than 0.005 mm, the solvent in the paste tends not to be absorbed, and if it exceeds 0.3 mm, the thickness of the adhesive tape is thick, the winding length is shortened, and replacement is frequent. Since there is a tendency, it is not preferable.

Next, the Example which applied the embodiment of this invention and cleaned the coating head of the phosphor paste for plasma displays is shown. The phosphor paste used was prepared by the following method. A phosphor paste was prepared by dispersing and mixing in a 16 wt% terpineol / benzine alcohol (weight ratio: 3/1) solution of ethyl cellulose having a weight ratio of 20, where the weight ratio of the inorganic phosphor powder was 19.
The phosphor powder used is (Y, Gd) BO ₃ : Eu for red light emission, ZnSiO ₄ : Mn for green light emission, and BaMgA1 ₁₀ O ₁₇ : Eu for blue light emission. The cumulative average particle diameter and the maximum particle diameter of the phosphor powders of each color are red phosphor: 2.7 μm and 27 μm, blue phosphor: 3.7 μm, 27 μm, and green phosphor: 3.6 μm, 25 μm.

  The viscosities are red phosphor paste: 52000 mPa · s, blue phosphor paste: 39000 mPa · s, and green phosphor paste: 40000 mPa · s.

  The application head for applying the phosphor paste is an application head in which 1920 discharge ports with a hole diameter of 100 μm are arranged in the longitudinal direction, and a gas pressure of 0.2 to 1 MPa is applied inside to discharge the paste from the discharge ports. Then, phosphor pastes of three colors are applied for each color between predetermined partitions.

As a coating device for coating using a coating head, a stage having four axes of XYZθ, a control unit for controlling and driving the four axes of XYZθ, and storage control for controlling the operation of the coating device and the cleaning device by a predetermined program The apparatus comprised from the part etc. was used. The pressure-sensitive adhesive tape used for cleaning the phosphor paste adhered to the discharge port and discharge surface of the coating head is as follows.
Adhesive tape: Nitto Denko Corporation ELEP (registered trademark)
Example 1
The three color phosphor pastes prepared as described above were filled in the coating head, the coating head was mounted on the coating device, and the three color phosphor pastes were respectively applied between predetermined partitions. Thereafter, using a roll of adhesive tape, the coating head with the phosphor paste adhered to the discharge port and the discharge surface was cleaned using the cleaning device of FIG. A rubber roll having a diameter of 60 mm, a rubber hardness of A30, and a rubber thickness of 10 mm was used as an elastic body for pressing the coating head.
In order to adjust the gap 17 between the elastic body and the adhesive tape, the installation height of the gap adjustment bar 16 is adjusted, and the width of the contact area S where the adhesive tape contacts the elastic body is W = 50D = 50 × 100 μm = It adjusted so that it might be set to 5 mm.

  The discharge port and discharge surface of the coating head were brought into contact with the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape, which was adjusted as described above, and held for 4 seconds while being pressed against the coating head with a pressure of 0.2 MPa. Thereafter, the adhesive tape was peeled from the coating head by applying a tension of 50 N / m to the adhesive tape while moving the coating head in the vertical direction at 100 mm / s. Although thin corrugated deposits remained on the discharge surface after cleaning due to the wrinkles of the adhesive tape, the phosphor paste around the discharge port was roughly removed, so while cleaning with this cleaning device, Although coating was performed, the occurrence of coating defects was negligible.

Example 2
In the pressing portion of the apparatus described in Example 1, in order to prevent wrinkles from being generated on the adhesive tape, a wrinkle stretch is provided with an arcuate curvature (R = 14,000 mm) in the width direction of the adhesive tape. Cleaning was performed in the same manner as in Example 1 using the cleaning device of FIG. By installing the wrinkle-stretching bar, the pressure-sensitive adhesive tape in contact with the coating head was further smoothed, the contact pressure was improved, and the transferability was improved as compared with Example 1. As a result, the remaining deposits were reduced. Further, no coating defects occurred even when 500 sheets were applied.

Example 3
In the pressing portion of the apparatus described in the first embodiment, cleaning is performed in the same manner as in the first embodiment by using the cleaning apparatus of FIG. 6 having the gap adjustment bar 16a having both the function of adjusting the gap and the function of extending wrinkles. went. With this gap adjustment bar, the same effect as in Example 2 was obtained. In addition, since the gap adjustment and wrinkle extension can be performed simultaneously, the work efficiency of the adjustment has been greatly improved.

Comparative Example 1
Cleaning was performed in the same manner as in Example 1 by using the cleaning device in FIG. 9 in which the gap adjusting bar 16 was replaced with the wrinkle-stretching bar 18 in the pressing portion of the apparatus described in Example 1. A gap area is formed before and after the contact area S by the wrinkle-stretching bar 18, but the width W of the contact area S is about 30 mm, which is about 300 times the opening width D of the discharge port. It was in a state of being adsorbed to the elastic body by the negative pressure generated when it was pushed in. As a result, since the adhesive tape could not be peeled off from the coating head at high speed, a phosphor paste residue remained in the vicinity of the discharge port of the coating head after cleaning, and satisfactory coating could not be performed.

Comparative Example 2
In the apparatus described in Example 1, cleaning is performed using the pressing unit in FIG. 3 in which the width of the contact area S where the adhesive tape contacts the elastic body is adjusted to be W = 20D = 20 × 100 μm = 2 mm. went. As a result, in the process of pushing the coating head into the elastic body and spreading the phosphor paste with the adhesive layer of the adhesive tape, contact pressure could not be instantaneously obtained in the gap between the elastic body and the adhesive tape, resulting in transfer failure. Therefore, good coating could not be performed.

Comparative Example 3
In the apparatus described in Example 1, the pressing unit cleaning apparatus in FIG. 4 is used in which the width of the contact area S where the adhesive tape contacts the elastic body is adjusted to be W = 180D = 180 × 100 μm = 18 mm. Cleaned up. As a result, the adhesive tape was adsorbed to the elastic body by the negative pressure generated when the coating head was pushed. For this reason, the adhesive tape cannot be lifted at the same time as the coating head and peeled off at a high speed with a high tension applied to the adhesive tape, so that a residue may remain around the discharge port. Therefore, good coating could not be performed.

  The present invention can be applied not only to a plasma display, but also to a color filter for liquid crystal displays and a cleaning device for a coating head in an organic EL, and its application range is not limited thereto.

DESCRIPTION OF SYMBOLS 1 Application | coating head 2 Pressure piping 3 Phosphor paste 4 Discharge surface 5 Discharge port 6 Upper frame 7 Lower frame 8 Adhesive tape 9 Unwinding roll 10 Rewinding roll 11 Unwinding motor 12 Rewinding motor 13 Pushing part 14 Elastic body 15 Post 16 Gap adjustment bar 16a Gap adjustment bar 17 Gap 18 Wrinkle extension bar 19 Scraper 20 Wiping cloth 21 Wiping scratch D Discharge opening width S Contact area W Width of contact area S in X direction

Claims (3)

A coating head cleaning device that removes a coating liquid adhering to the vicinity of a discharge port of a coating head having a plurality of discharge ports arranged in substantially one row against an adhesive tape, wherein the arrangement direction of the discharge ports is a Y direction. When the direction in which the coating head is pressed against the adhesive tape is the Z direction and the direction perpendicular to both is the X direction, when the coating head is pressed against the adhesive tape, the surface opposite to the adhesive surface of the adhesive tape An elastic body that supports the tape from the side, and an adjusting unit that is disposed on both sides in the X direction of the elastic body and adjusts a contact state between the adhesive tape and the elastic body, and presses the coating head against the adhesive tape In the previous state, the width W in the X direction of the contact area S where the elastic body and the adhesive tape contact is 30 to 150 times the opening width D of the discharge port, and the X direction of the contact area S On the side, coating head cleaning device, characterized in that said adhesive tape and said elastic body has a gap region which does not contact. The coating head cleaning apparatus according to claim 1, further comprising a wrinkle extending means for preventing wrinkles of the adhesive tape. An application head cleaning method for cleaning an application head using the application head cleaning device according to claim 1, wherein the application head is pressed against and brought into contact with the adhesive tape supported by the elastic body, The coating head is moved in a direction opposite to the direction in which the coating head is pressed against the elastic body, and the adhesive tape is peeled off from the coating head, and the coating liquid adhering to the vicinity of the discharge port is transferred to the adhesive tape. Head cleaning method.

Images