JP2005095757A - Paste application method and paste application apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus by which coating bubbles, coating unevenness and color mixing appearing at the time of applying phosphor paste to an irregular surface such as a plasma display panel back face plate by an application method of a dispensation process or an electric field jet process. <P>SOLUTION: The application apparatus of the dispensation process or the electric field jet process is provided with a slit nozzle for generating negative pressure at a position before an application nozzle. Otherwise, the application apparatus of the dispensation process or the electric field jet process is provided with the slit nozzle for generating positive pressure at a position after the application nozzle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is used in the field of manufacturing flat displays such as plasma displays and liquid crystal displays, printed circuit boards, semiconductors, etc., and in particular, a plasma display panel (hereinafter referred to as a high-viscosity coating liquid). , Referred to as PDP).

  In recent years, plasma display panels (hereinafter referred to as PDPs) are being used in various display devices due to their thin depth, light weight, clear display, and wide viewing angle. In general, a PDP has a structure in which a pair of electrodes regularly arranged on two opposing glass substrates are provided, and a gas mainly composed of neon, xenon, or the like is enclosed therebetween. Then, a voltage is applied between these electrodes, and discharge is generated in minute cells around the electrodes, thereby causing each cell to emit light for display. In particular, in order to display information, the regularly arranged cells are selectively discharged to emit light.

  Here, the configuration of the PDP will be described with reference to an example of the AC type PDP shown in FIG. FIG. 4 is a perspective view of the PDP configuration, but the front plate (glass substrate 41) and the back plate (glass substrate 42) are shown separated from each other for the sake of clarity. As shown in the figure, two glass substrates 41 and 42 are arranged in parallel and facing each other, and both are provided with ribs (also referred to as barriers) 43 provided in parallel with each other on the glass substrate 42 serving as a back plate. By this, it is held at a constant interval. On the back side of the glass substrate 41 serving as the front plate, a composite electrode composed of a discharge sustaining electrode 44 made of a transparent electrode and a bus electrode 45 made of a metal electrode is formed in parallel with each other, covering the dielectric layer 46 is formed, and a protective layer 47 (MgO layer) is further formed thereon. Further, on the front side of the glass substrate 42 serving as a back plate, address electrodes 48 are formed in parallel with each other so as to be positioned between the ribs 43 so as to be orthogonal to the composite electrode. 49 is formed, and the phosphor 50 is provided so as to cover the wall surface of the rib 43 and the cell bottom surface. The rib 43 is for partitioning the discharge space, and each partitioned discharge space is called a cell or a unit light emitting region. The AC type PDP is a surface discharge type, and has a structure in which an AC voltage is applied between the composite electrodes on the front plate to discharge. In this case, since alternating current is applied, the direction of the electric field changes corresponding to the frequency. The phosphor 50 is caused to emit light by the ultraviolet rays generated by this discharge, and the observer visually recognizes the light transmitted through the front plate. The DC type PDP is different from the AC type in that the electrode has a structure not covered with a dielectric layer, but the discharge effect is the same.

  In the back plate of the PDP as described above, an address electrode 48 is formed on a glass substrate 42, and a dielectric layer 49 is formed so as to cover it, and then a rib 43 is formed. It is manufactured by providing the phosphor layer 50 between 43. As a manufacturing method of the electrode 48, a film of an electrode material is formed on the glass substrate 2 by a vacuum deposition method, a sputtering method, a plating method, a thick film method, etc., and this is patterned by a photolithography method, A screen printing method using a thick film paste is known. The dielectric layer 49 is formed by screen printing or the like. The ribs 43 are patterned by overprinting by screen printing or by sandblasting.

  The phosphor layer 50 is selectively filled with phosphor pastes for each color of red (R), green (G), and blue (B) between the ribs 43, and then dried and fired. Conventionally, a screen printing method or a photolithographic method is used for filling the phosphor paste. In the screen printing method, the phosphor paste is selectively filled between ribs by screen printing and dried three times, and then fired. However, the screen printing method needs to use a screen plate corresponding to the high definition and large area of the PDP. However, such a screen plate is stretched and distorted, so There is a problem that it is difficult to align the face plate with the glass substrate, and the phosphor paste cannot be filled accurately.

  In the photolithography method, a process of applying a photosensitive phosphor paste, exposing, developing, and drying is repeated three times, followed by firing to form a phosphor layer. However, since the phosphor in the paste hinders the transmission of ultraviolet rays and the sensitivity becomes low, it is not possible to increase the coating thickness of the photosensitive phosphor paste. There was a problem that was not enough. Furthermore, due to the photolithographic method, a considerable amount of the phosphor paste is removed during development, and it is difficult to recover the phosphor, so that the effective utilization rate of the phosphor used is low, which is disadvantageous in terms of cost. It was.

  Therefore, recently, a paste coating nozzle having discharge holes in a direction perpendicular to the coating direction is used, the coating nozzle is opposed to the substrate, and either the substrate or the coating nozzle is moved relatively, There has been proposed a coating method by a dispensing method in which a pressure is applied in the coating nozzle to fill the phosphor paste between the ribs. If a plurality of application nozzles are provided, it is possible to apply phosphor pastes of three colors over a large area in a single application process. The dispensing method has further developed into a method called an electric field jet method in which a paste is applied while applying a voltage between an electrode provided in the vicinity of a paste discharge port of a coating nozzle and an object to be coated. (For example, refer to Patent Document 1).

In the application method by the dispense method or the electric field jet method, when applying to an uneven surface such as a PDP back plate, in order to reduce unevenness of application, for example, a phosphor paste is applied to the tops of ribs on both sides of a cell to be applied. A method of filling while discharging and touching is performed (for example, see Patent Document 2). FIG. 3 shows the application state at that time as a schematic cross-sectional view along the application nozzle traveling direction.
JP 2001-88306 A JP 2001-347210 A

  However, in the conventional coating method shown in FIG. 3, the phosphor paste 34 coated on the rib that is the coated surface 32 on the substrate 31 from the coating nozzle 33 has a high viscosity, so that the coating nozzle is applied to the coated surface 32. It is bent greatly in the horizontal direction opposite to the traveling direction. Therefore, it becomes easy for bubbles to enter the applied paste 34, and the rib 34 and the paste 34 are surrounded by the rib and paste after the paste 34 is filled between the ribs until the paste 34 is naturally leveled. A phenomenon occurs in which air in the space cannot completely escape and the bubbles are bitten in the paste. In particular, as the coating speed is increased, this bubble biting phenomenon becomes more prominent. Once the air has entered the paste, the phosphor paste has a high viscosity of about 50 to 200 poise. Cause color mixing and coating unevenness.

  The present invention has been made in view of such problems, and is applied when a high-viscosity paste such as a phosphor paste of a PDP is applied by a dispensing method or an electric field jet method. The paste is bent in the horizontal direction with respect to the surface to be coated, suppresses entrainment of bubbles, reduces the occurrence of defects due to the applied bubbles, eliminates phosphor color mixing and coating unevenness, and forms the phosphor layer uniformly. Another object of the present invention is to provide a paste coating method and a paste coating apparatus.

  In order to solve the above-mentioned problems, a coating apparatus according to the invention of claim 1 is a coating nozzle while moving either one of a coating nozzle filled with paste and a surface to be coated relative to the other. In a dispensing method or electric field jet method coating apparatus having a mechanism for applying a paste to a surface to be coated by applying a pressure inside, a slit nozzle for generating a negative pressure at a position before coating than the coating nozzle is provided. It is what you have done.

  In the coating apparatus according to the second aspect of the present invention, the slit nozzle for generating the negative pressure has one rectangular opening perpendicular to the paste application direction, and simultaneously at a position before application of the plurality of discharge ports of the application nozzle. A negative pressure is generated.

  According to a third aspect of the present invention, there is provided a coating apparatus in which a large number of holes are opened in the slit nozzle that generates the negative pressure.

  In a coating apparatus according to a fourth aspect of the present invention, the slit nozzle for generating the negative pressure is integrated with the coating nozzle.

  According to a fifth aspect of the present invention, there is provided a coating apparatus in which the slit nozzle for generating the negative pressure has a mechanism capable of adjusting the negative pressure.

  According to a sixth aspect of the present invention, there is provided a paste coating method using the coating apparatus according to any one of the first to fifth aspects.

  According to a seventh aspect of the present invention, there is provided a coating apparatus that applies pressure to the coating nozzle while moving either one of the coating nozzle filled with paste or the surface to be coated relative to the other. A dispensing method or an electric field jet coating device that applies a strike to a surface to be coated is provided with a slit nozzle that generates pressure at a position after coating rather than the coating nozzle.

  In the coating apparatus according to an eighth aspect of the present invention, the slit nozzle for generating the pressurization has one rectangular opening perpendicular to the paste coating direction, and simultaneously at the positions after coating of the plurality of discharge ports of the coating nozzle. The pressure is generated.

  In the coating apparatus according to the ninth aspect of the invention, a plurality of holes are opened in the slit nozzle for generating the pressurization.

  According to a tenth aspect of the present invention, there is provided a coating apparatus in which the slit nozzle for generating the pressure is integrated with the coating nozzle.

  In a coating apparatus according to an eleventh aspect of the invention, the slit nozzle for generating the pressurization has a mechanism capable of adjusting the pressurization.

  According to a twelfth aspect of the present invention, there is provided a paste coating method using the coating apparatus according to any one of the seventh to eleventh aspects.

  According to a thirteenth aspect of the present invention, the paste application method is characterized in that the paste according to the sixth and twelfth aspects is a phosphor paste of a plasma display panel.

  According to the paste application method and apparatus of the present invention, in the dispense method or the electric field jet method, a slit nozzle for generating negative pressure is installed in the application nozzle, and the application paste discharged from the application nozzle is applied. By applying at a coating angle that is more perpendicular to the surface to be coated, a coating film surface with no coating bubbles and no coating unevenness or color mixing can be obtained uniformly. Furthermore, even if the coating speed is doubled compared to the conventional method, no defects due to the coating bubbles occur, so that the speed of the coating line can be increased.

  Further, since the application angle is close to vertical, not only the application of the phosphor paste to the stripe ribs of the AC type PDP but also the application of the phosphor paste to the matrix ribs is facilitated.

  Further, in the paste application in the dispensing method or the electric field jet method, according to the paste application method and apparatus of the present invention, a pressure nozzle for generating pressure is installed in the application nozzle, and the applied paste is By forcibly pushing between the ribs before mixing of bubbles occurs, no coating bubbles are generated, and a high-quality coating film surface with no coating unevenness and color mixing can be obtained uniformly. Furthermore, even if the coating speed is doubled compared to the conventional method, no defects due to the coating bubbles occur, so that the speed of the coating line can be increased.

  Further, since the application angle is close to vertical, not only the application of the phosphor paste to the stripe ribs of the AC type PDP but also the application of the phosphor paste to the matrix ribs is facilitated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view illustrating a first embodiment according to the present invention. A surface to be coated 12 is formed on a substrate 11, and a coating nozzle is moved in the direction of an arrow. The coating nozzle 13 represents a dispensing nozzle or a field jet coating nozzle. In the case of the electric field jet method, the paste is applied while applying a voltage between the electrode provided near the paste discharge port of the application nozzle and the object to be coated. In FIG. It is omitted.

  In FIG. 1, a slit nozzle 15 for generating a negative pressure is installed at a position before application of the application nozzle 13, and the negative pressure slit nozzle 15 is a negative pressure generation suction device such as a vacuum pump via a chamber 16. It is connected to. The chamber 16 is connected to the coating nozzle 13, and the negative pressure slit nozzle 15 is integrated with the coating nozzle 13. The slit nozzle 15 moves in the XY direction in conjunction with the coating nozzle 13, and the slit nozzle 15 The negative pressure generating portion at the tip is provided close to the discharge port 13a of the application nozzle so as to obtain a paste suction effect.

In FIG. 1, the nozzle tip slope of the coating nozzle 13 is formed at 45 ° with respect to the surface to be coated, and therefore the tip 15 a of the negative pressure slit nozzle is inclined at 45 ° so that it can be close to the coating nozzle 13. An example in which a rectangular opening is provided perpendicular to the paste application direction is shown. The paste 14 discharged from the coating nozzle 13 is drawn toward the slit nozzle 15 by the negative pressure of the slit nozzle 15 and is discharged in a direction substantially perpendicular to the surface to be coated 12. As a result, entrainment of bubbles in the applied paste 14 is suppressed. The vacuum degree of the negative pressure is preferably 1 × 10 ⁻² Torr or less. In the present invention, the negative pressure slit nozzle 15 is preferably provided with a mechanism capable of adjusting the negative pressure.

  As described above, the shape of the negative pressure slit nozzle 15 is preferably a shape that matches the shape of the coating nozzle 13. For example, when the application nozzle 13 has a horizontally long rectangular cross section, the tip portion of the slit nozzle 15 also has a horizontally long rectangular cross section. Is preferred.

  Further, in the present invention, a slit nozzle having a number of holes corresponding to each discharge port 13a of the paste application nozzle can be arranged, and each of the plurality of discharge ports 13a of the application nozzle 13 is perpendicular to the paste application direction. A form in which negative pressure is simultaneously generated and sucked by one negative pressure slit nozzle having one rectangular opening is also possible.

  Further, in the present invention, in order to enhance the suction effect of attracting the discharge paste of the negative pressure slit nozzle 15, a shape in which a large number of small holes are provided at the tip portion of the slit nozzle 15 near the discharge port 13a of the coating nozzle. It is also a preferred form. Furthermore, in the present invention, since the coating nozzle 13 and the negative pressure slit nozzle 15 move in the XY directions at regular intervals, it is also preferable that the coating nozzle 13 and the negative pressure slit nozzle 15 are integrated.

  As the material of the application nozzle 13 of the present invention, ceramic and resin can be used as in the conventional case. As the material of the negative pressure slit nozzle 15, stainless steel, ceramic, and resin are used.

  As described above, according to the paste application method and apparatus of the present invention, the application foam 14 is formed by applying the application paste 14 discharged from the application nozzle 13 at an application angle more perpendicular to the surface to be applied. It does not occur, and a high-quality coating film surface with no coating unevenness and color mixing can be obtained uniformly.

  Further, according to the paste coating method and apparatus of the present invention, since the coating angle is nearly vertical, the phosphor paste is applied to the back plate having the stripe ribs 43 of the AC type PDP as shown in FIG. In addition to coating, phosphor paste is also applied to a back plate 53 having matrix-like ribs provided with ribs 51a, 51b, 51c and auxiliary ribs 52a-52d or 62a-62d as shown in FIGS. It becomes easy. 5 and 6 are perspective views showing an example of the rib shape of the AC type PDP. In FIG. 5, the cross-sections of the auxiliary ribs 52a to 52d are trapezoidal or nearly rectangular, and in FIG. The two ridges in the cross section of ˜62d have a shape that widens toward the surface of the back plate 53. Usually, the height of the auxiliary rib is lower than the height of the rib.

  FIG. 2 is a schematic cross-sectional view illustrating a second embodiment of the present invention. A surface to be coated 22 is formed on a substrate 21, and the coating nozzle is moved in the direction of the arrow. The coating nozzle 23 is a dispensing nozzle or an electric field jet coating nozzle. In the case of the electric field jet method, the paste is applied while applying a voltage between the electrode provided in the vicinity of the paste discharge port of the application nozzle and the object to be applied, but this portion is omitted in FIG. It is.

  A slit nozzle 25 for generating pressurization is installed at a position after application rather than the application nozzle 23, and the slit nozzle 25 is connected to a pressurized air generator such as a compressor. The slit nozzle 25 moves in the X and Y directions in conjunction with the application nozzle 23, and the tip 25 a of the pressurizing slit nozzle near the tip is provided close to the discharge port 23 a of the application nozzle 23. As soon as the paste 24 is applied from the application nozzle 23, the slit nozzle 25 forcibly pushes the applied paste 24 between the ribs while generating pressure, thereby applying the applied paste. It suppresses that a bubble is caught in 24. The pressurizing pressure is preferably about 30 to 200 kPa. In the present invention, the pressure slit nozzle 25 preferably has a mechanism capable of adjusting the pressure.

  The shape of the pressure slit nozzle 25 is preferably a shape that matches the discharge port shape of the application nozzle 23. For example, when the application nozzle 23 has a horizontally long rectangular cross-sectional shape, it is preferable that the tip portion of the slit nozzle 25 also has a horizontally long rectangular cross-sectional shape.

  Furthermore, in the present invention, a slit nozzle having a number of holes corresponding to each discharge port 23a of the paste application nozzle can be arranged, and each of the plurality of discharge ports 23a of the application nozzle 23 is perpendicular to the paste application direction. A configuration in which pressure is simultaneously generated by one slit nozzle having one rectangular opening is also possible.

  In the present invention, after applying the paste, in order to enhance the effect of pushing the applied paste 24 between the ribs, the tip of the slit nozzle 25 is provided with a number of small holes. Is also a preferred form. Furthermore, in the present invention, since the coating nozzle 23 and the pressure slit nozzle 25 move in the same direction in the XY direction at regular intervals, it is also preferable that the coating nozzle 23 and the pressure slit nozzle 25 are integrated.

  As the material of the application nozzle 23 of the present invention, ceramic and resin can be used as in the first embodiment, and as the material of the pressure slit nozzle 25, stainless steel, ceramic and resin are used.

  As described above, according to the paste application method and apparatus of the present invention, the application foam discharged from the application nozzle 23 is forcibly pushed between the ribs before the foam is mixed, so that the application foam is formed. It does not occur, and a high-quality coating film surface with no coating unevenness and color mixing can be obtained uniformly.

  Further, according to the paste coating method and apparatus of the present invention, since the coating angle is nearly vertical, not only the phosphor paste is coated on the stripe ribs 43 of the AC type PDP as shown in FIG. As shown in FIGS. 5 and 6, the phosphor paste can be easily applied to the back plate 53 having matrix ribs provided with ribs 51a, 51b, 51c and auxiliary ribs 52a to 52d or 62a to 62d.

The 42-inch AC type PDP back plate phosphor paste was formed by the electric field jet method according to the first embodiment. First, after patterning an address electrode on a glass substrate, a dielectric layer was formed covering the address electrode, and line-shaped ribs were formed on the dielectric layer by sandblasting. The pitch of the formed rib is 300 μm, the height is 120 μm, the rib top width is 60 μm, the rib bottom width is 110 μm, and the cell cross-sectional area is 0.026 mm ² .

  The coating apparatus was composed of a coating nozzle by an electric field jet method having a moving function in the XYZ directions, and a slit nozzle that generates a negative pressure. The slit nozzle was fixed to the application nozzle so that it could move as a unit.

  MC nylon resin was used as the material for the coating nozzle and the negative pressure slit nozzle. The discharge part of the coating nozzle has an elliptical discharge port (a vertical side length of 700 μm and a parallel side length of 400 μm with respect to the traveling direction) with a pitch of 0.9 mm. The opening width of the slit portion at the tip of the negative pressure slit nozzle was a 4 mm horizontally long slit shape so that a plurality of discharge ports of the coating nozzle could be sucked by one slit nozzle.

  The coating conditions are as follows: the distance between the tip of the coating nozzle discharge portion and the surface to be coated is 0.4 mm, the coating speed is 70 mm / second, a high-voltage pulse is a rectangular wave voltage pulse with an amplitude of 5 kV and an offset of 0 V at a frequency of 800 Hz. Applied. The distance between the tip of the negative pressure slit nozzle and the surface to be coated was 0.9 mm, and the distance between the tip of the negative pressure slit nozzle and the tip of the application nozzle discharge port was 1 mm. Negative pressure was generated by connecting a negative pressure slit nozzle to a suction device through a chamber.

  Next, the rib direction of the substrate was aligned with the application nozzle and the slit nozzle, application was performed while applying a voltage pulse and suctioning with a negative pressure slit nozzle. The application state was evaluated by observing the application state with a CCD camera.

  After the paste application, the coated substrate was evaluated. As a result, the substrate using the negative pressure generating slit nozzle produced no coating bubbles, and a good coated film surface with no coating unevenness was obtained.

  Furthermore, when the coating speed is only doubled to 140 mm / sec and the other conditions are applied under the same conditions, the coating is performed on the entire coated surface of the substrate when the negative pressure generating slit nozzle used for comparison is not used. In contrast to the generation of bubbles, the substrate using the negative pressure generating slit nozzle did not generate coating bubbles, and a good coating film surface free from coating unevenness and color mixing was obtained.

  The 42-inch AC type PDP back plate phosphor paste was formed by the electric field jet method according to the second embodiment. The substrate, coating nozzle, and phosphor paste are the same as those in the first embodiment.

  The coating apparatus was composed of the same coating nozzle as in Example 1 by the electric field jet method having a moving function in the XYZ directions, and a slit nozzle that generates pressure.

  As a material for the pressure slit nozzle, an easy-cutting ceramic was used. The slit nozzle that generates pressure has a rectangular shape similar to the application nozzle, and the vertical side length with respect to the traveling direction of the slit portion of the pressure slit nozzle is 700 μm, and the parallel side length is 200 μm. The generation of pressurization was carried out by sending compressed air from the compressor to the pressurization slit nozzle.

  Next, the position of the coating nozzle and the slit nozzle is aligned with respect to the rib direction of the substrate, the distance between the tip of the coating nozzle discharge part and the surface to be coated is 0.5 mm, the coating speed is 70 mm / second, A rectangular wave voltage pulse with an amplitude of 5 kV and an offset of 0 V was applied at a frequency of 800 Hz. The distance between the pressure slit nozzle tip and the surface to be coated was 0.5 mm, and the distance between the pressure slit nozzle tip and the coating nozzle discharge port tip was kept at 5 mm. Subsequently, immediately after applying the voltage and discharging and applying the paste with the application nozzle, the application paste is forcibly pushed between the ribs with a pressure slit nozzle to which a back pressure of 0.15 kg / cm is applied. Application was performed. The application state was evaluated by observing the application state with a CCD camera.

  After the paste application, the application state was evaluated. As a result, the substrate using the pressure generating slit nozzle did not generate application bubbles, and a good coating film surface without application unevenness was obtained.

Schematic cross-sectional view for explaining the first embodiment of the present invention Cross-sectional schematic diagram for explaining a second embodiment of the present invention Cross-sectional schematic diagram explaining conventional coating method An exploded perspective view showing an example of the configuration of an AC type PDP The perspective view which shows an example (the 1) of the rib shape of AC type PDP which can apply this invention The perspective view which shows an example (the 2) of the rib shape of AC type PDP which can apply this invention

Explanation of symbols

11, 21, 31 Substrate 12, 22, 32 Surface to be coated 13, 23, 33 Coating nozzle 13a, 23a, 33a Coating nozzle discharge port 14, 24, 34 Paste 15 Negative pressure generating slit nozzle 15a Tip of negative pressure generating slit nozzle 16 Chamber 25 Pressure generation slit nozzle 25a Pressure generation slit nozzle tip 41, 42 Glass substrate 43 Rib 44 Discharge sustaining electrode 45 Bus electrode 46, 49 Dielectric layer 47 Protective layer (MgO layer)
48 Address electrode 50 Phosphor layer 51a, 51b, 51c Rib 52a, 52b, 52c, 52d, 62a, 62b, 62c, 62d Auxiliary rib 53 Back plate

Claims (13)

A mechanism for applying the paste to the application surface by applying pressure in the application nozzle while moving either the application nozzle filled with paste or the application surface relative to the other. A dispensing apparatus or an electric field jet coating apparatus, comprising a slit nozzle that generates a negative pressure at a position before coating than a coating nozzle. 2. The coating apparatus according to claim 1, wherein the slit nozzle that generates the negative pressure has one rectangular opening perpendicular to the paste application direction, and is simultaneously negative at positions before application of the plurality of discharge ports of the application nozzle. An applicator that generates pressure. The coating apparatus according to claim 1, wherein a plurality of holes are opened in the slit nozzle that generates the negative pressure. 4. The coating apparatus according to claim 1, wherein the slit nozzle for generating the negative pressure is integrated with the coating nozzle. 5. The coating apparatus according to claim 1, wherein the slit nozzle that generates the negative pressure has a mechanism capable of adjusting the negative pressure. A paste coating method using the coating apparatus according to claim 1. A dispensing method in which either a coating nozzle filled with paste or a surface to be coated is moved relative to the other while pressure is applied in the coating nozzle to apply the paste to the surface to be coated, or An electric field jet coating apparatus comprising a slit nozzle that generates pressure at a position after coating rather than the coating nozzle. 8. The coating apparatus according to claim 7, wherein the slit nozzle for generating pressure has one rectangular opening perpendicular to the paste application direction, and is simultaneously applied to the positions after application of the plurality of discharge ports of the application nozzle. An applicator that generates pressure. 8. The coating apparatus according to claim 7, wherein a plurality of holes are opened in the slit nozzle that generates the pressurization. 10. The coating apparatus according to claim 7, wherein the slit nozzle that generates the pressure is integrated with the coating nozzle. 11. The coating apparatus according to claim 7, wherein the slit nozzle for generating the pressurization has a mechanism capable of adjusting the pressurization. 12. A paste coating method using the coating apparatus according to claim 7. 13. The paste coating method according to claim 6, wherein the paste according to claim 6 is a phosphor paste of a plasma display panel.

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