JP2009240901A - Coating nozzle, coating method of paste, and manufacturing method of member for plasma display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating nozzle having a discharge port corroded by progress of ultrasonic erosion and having a dummy for preventing the occurrence of the erosion. <P>SOLUTION: A plurality of recesses or protrusions are arranged in rows in the vicinity of a discharge port or a positioning mark which is located at the terminal portion of the coating nozzle. The plurality of recesses or protrusions are arranged to gradually reduce the depth of the plurality of recesses or the height of the plurality of protrusions or the diameter of the plurality of the recesses or protrusions within the surface of the discharge port as they are separated from the discharge port or the positioning mark. Thus, the ultrasonic erosion in the vicinity of the discharge port or the positioning mark which is caused by the ultrasonic cleaning of the coating nozzle is prevented, and the performance deterioration due to the ultrasonic erosion of the coating nozzle can be suppressed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides an improved coating nozzle that eliminates ultrasonic damage during ultrasonic cleaning, a coating method that uses a coating nozzle that has been cleaned by ultrasonic cleaning, and a member for a plasma display manufactured by the coating method. The present invention relates to an improvement in a method for manufacturing a member for a plasma display.

  In recent years, in a large-sized television for home use, the display method is rapidly changing from a cathode ray tube to a flat display (FPD) such as a plasma display (PDP) or a liquid crystal display (LCD).

  The PDP generates a plasma discharge in a discharge space provided between the front plate and the back plate, and ultraviolet rays generated from the gas enclosed in the discharge space are R (red), G (green), B (blue) is a color display that emits light by being applied to a phosphor provided in the discharge space of each color.

  The back plate, which is the main member, has a phosphor layer formed by applying RGB phosphor paste in a fine pattern groove in a lattice or stripe shape formed of partition walls on a glass substrate. For the application of the RGB phosphor paste to the pattern groove, screen printing method, photolithography method, etc. have been generally used, but in recent years, application using an application nozzle is high in use efficiency of the paste and is inexpensive. It has come to be used frequently because it is easy to apply (for example, Patent Document 1).

  Since this coating nozzle discharges a high-viscosity phosphor paste into a fine groove corresponding to the pixel size, fine discharge ports with a diameter of about 50 to 150 μm are usually several tens in a line in the same plane. ˜Several hundreds are provided, and 1000 or more are provided when the screen corresponds to a high-definition color screen. In addition, the distance between the discharge ports of the coating nozzle is precisely adjusted according to the arrangement pitch of the pixels.

  When applying the phosphor paste to the fine pattern groove corresponding to the pixel using the coating nozzle manufactured precisely in this way, positioning is performed accurately so that the discharge port of the coating nozzle is directly above the groove. For this purpose, a positioning mark is provided in the vicinity of the discharge port of the coating nozzle, and this is utilized during positioning. The positioning mark is formed in a shape and size that can be distinguished from the discharge port. In many cases, the shape of the discharge port surface is a circular or cross-shaped recess or protrusion.

  If the phosphor paste is continuously applied for a long time with this application nozzle, the discharge port and its inner surface will clog the phosphor paste, aggregates of phosphor particles contained in the paste, other foreign matters, etc. The phosphor paste also adheres to the discharge port surface, which is a flat surface to be formed, making continuous use difficult. Therefore, when the phosphor paste is applied to a predetermined number of back plates, the coating nozzle is replaced, and not only the outer surface of the coating nozzle but also the inner surface of the fine discharge port is thoroughly cleaned so that it can be reused.

  Ultrasonic cleaning is applied to the above-described precision cleaning of the application nozzle because of its high cleaning performance. The ultrasonic cleaning of the coating nozzle is performed by immersing the coating nozzle in the cleaning liquid filled in the cleaning tank, and the discharge port surface including the discharge port of the coating nozzle and the vibration surface of the ultrasonic transducer face in parallel at regular intervals. In addition, the ultrasonic wave emitted from the ultrasonic transducer is effectively applied to the discharge port and the discharge port surface.

  This is because cavitation occurs at the liquid contact part with the discharge port surface when the ultrasonic wave irradiated from the vibration surface of the ultrasonic transducer is transmitted to the discharge port surface of the coating nozzle through the cleaning liquid. -The impact force generated when it disappears is transmitted to the discharge port surface and the inner surface of the fine discharge port, and the dirt consisting of dried phosphor paste, phosphor particle aggregates, foreign matter, etc. adhering to these surfaces It is because it is scraped off.

  In particular, in the case of a high-viscosity paste of 10 Pa · s or more, it is necessary to perform ultrasonic cleaning at a relatively low frequency (50 kHz or less) with strong cavitation because the adhesive strength to the coating nozzle is strong. In the cleaning, there is a problem that erosion tends to occur while the cleaning power is strong.

  As described above, when the coating nozzle is subjected to ultrasonic cleaning, high cleaning performance can be obtained by cavitation. However, on the other hand, there is a problem that ultrasonic erosion (erosion) occurs on the discharge port surface of the coating nozzle in contact with the cleaning liquid by cavitation. This is because the discharge port surface of the coating nozzle is scraped off due to the excessively high impact force of cavitation, and ultrasonic erosion concentrates on the discharge ports at both ends of the discharge port array, and the edge of the discharge port is shaved. Be taken. If such scraping occurs at the discharge port, accurate pattern coating cannot be performed, and the coating nozzle can no longer be used.

  In addition, if a positioning mark, which is a depression on the discharge port surface, is provided near the discharge port, ultrasonic erosion also occurs at this positioning mark, and the edge is shaved and the shape changes to allow the sensor to recognize the positioning mark. This makes it difficult to position the coating nozzle.

  As described above, when the coating nozzle is repeatedly subjected to ultrasonic cleaning as it is, the coating nozzle cannot be used, and there is a problem that the life of the coating nozzle is significantly shortened.

  Therefore, the inventors have provided an induction portion near the discharge port and the positioning mark at both ends of the discharge port array, moved the ultrasonic erosion occurrence point due to cavitation to the induction portion, and caused ultrasonic erosion at the discharge port and the positioning mark. Proposed to suppress the occurrence (Patent Document 2). As a result, the location where the ultrasonic erosion occurred was moved to the induction portion, and the discharge port or the positioning mark itself could be avoided. However, if the induction part is provided near the discharge port, the ultrasonic erosion generated in the induction part advances and expands to the nearby discharge port during repeated ultrasonic cleaning, and eventually erodes the discharge port. , It was found that the effect can not be fulfilled. In addition, it is conceivable that a large number of induction portions are provided and separated from the discharge ports, but the space where the induction portions can be installed is often limited in the vicinity of the discharge ports at both ends, which is difficult.

In addition, it has been proposed to diffuse the impact force by the microjet by applying unevenness to the surface where ultrasonic erosion occurs (for example, Patent Document 3), but when forming unevenness on the discharge port surface of the coating nozzle, The edges of the discharge port become jagged and rough, so that the phosphor paste can be discharged accurately and precise pattern coating cannot be performed, so that it is difficult to apply to the coating nozzle.
JP 2004-000928 A JP 2007-253150 A JP 2005-335416 A

  An object of the present invention is to provide a coating nozzle that can eliminate any damage to the discharge port due to ultrasonic erosion that occurs when the coating nozzle is ultrasonically cleaned.

  In order to achieve the above object, the present invention provides a plurality of discharge ports for discharging paste formed in a row in the discharge port surface, and other than the vicinity of the discharge ports at both ends of the row. A plurality of recesses or protrusions formed in a row in a direction away from the discharge port, wherein the depth of the plurality of recesses or the height of the protrusions, or the surface of the discharge port The application nozzle is characterized in that the diameters of the plurality of recesses or protrusions are gradually reduced as they are separated from the discharge ports at both ends of the row. Here, the “diameter of the dent or projection” refers to the diameter of an inscribed circle in contact with at least two points on the outer edge of the dent or projection on the plane where the discharge port is located.

  Similarly, for the positioning marks, a plurality of discharge ports for discharging paste are formed in a row in the discharge port surface, and in the discharge port surface near the discharge port row. A coating nozzle, in which a positioning mark is formed, and a plurality of dents or protrusions are formed in a direction away from the plurality of discharge ports from the vicinity of the positioning mark, the depth of the plurality of dents or There is provided a coating nozzle characterized in that the height of the protrusion or the diameter of the plurality of recesses or protrusions in the discharge port surface gradually decreases as the distance from the positioning mark increases.

  Furthermore, the present invention provides a method for applying a paste, characterized in that application is performed by discharging the paste onto a substrate using the above-described application nozzle subjected to ultrasonic cleaning.

  Furthermore, the present invention provides a method for producing a PDP member, wherein the present invention applies a phosphor paste using the paste application method described above.

  In the present invention, a plurality of dents and protrusions whose shapes are optimized are provided in the vicinity of a specific discharge port or positioning mark where ultrasonic erosion is concentrated when the coating nozzle is ultrasonically cleaned. Since the occurrence of this is completely transferred to these dents and protrusions and dispersed, it is possible to eliminate any damage caused by ultrasonic erosion of a specific discharge port or positioning mark. As a result, even if the coating nozzle is strongly ultrasonically cleaned, the coating nozzle can no longer be used and the life is not reduced, and it is possible to always maintain a high cleaning quality. In addition, since pattern application can always be performed with an application nozzle having high cleanliness, high application quality can be easily maintained, and application can be performed stably with high productivity.

  Since the PDP is manufactured by the above-described excellent coating method, it is possible to manufacture a high-quality PDP with high productivity and low cost even for a high-definition panel.

  Hereinafter, the case where the best embodiment of the present invention is applied to an application nozzle for applying a phosphor paste for PDP will be described as an example with reference to the drawings. The application nozzle of the present invention is applied to a high-viscosity paste. Any nozzle may be used, and the present invention is not limited to the application nozzle for the phosphor paste for PDP.

  FIG. 1 is a front sectional view of the coating nozzle of the present invention, FIG. 2 is a schematic plan view showing the discharge port surface of the coating nozzle of the present invention, and FIG. 3 is a partially enlarged view of the vicinity of the end discharge port of the coating nozzle of the present invention. FIG.

  Referring to FIG. 1, an application nozzle unit 10 including an application nozzle 1 and a manifold 6 of the present invention is shown. The application nozzle 1 is provided with discharge ports 2 for discharging paste in rows. Further, the manifold is provided with a paste supply port 5, a pressurized air supply port 9, and a remaining amount detection means (not shown) of the phosphor paste 8 in the nozzle unit. A paste is supplied into the coating nozzle unit 10 from the paste supply unit 7 connected to the paste supply port 5. By applying the controlled pressurized air to the pressurized air supply port 9, the phosphor paste 8 is discharged from the discharge port 2 toward the substrate that moves relative to the coating nozzle unit 10.

  Although there is no restriction | limiting in particular as a dimension of the application | coating nozzle 1, All the fluorescent substance pastes of at least 1 color can be apply | coated to the glass substrate whole surface by one application | coating operation | movement in width 10-200mm, thickness 0.01-20mm. A length (about 1 m or more for a 42-inch PDP glass substrate) is suitable. In particular, it is more suitable for coating a large PDP phosphor of 30 inches or more.

  As a material of the application nozzle 1, a metal material excellent in rust prevention such as stainless steel is preferable. This is because, when foreign matter such as rust is mixed from the surface of the coating nozzle 1 into the paste, which is a coating liquid for pattern coating, the fine discharge port 2 may be clogged, and therefore, a material that is resistant to rust and scratches is suitable. However, it is not limited to this as long as the function as the application nozzle is not impaired, and various known materials can be used.

  The application nozzle 1 is provided with a plurality of discharge ports 2 for discharging the phosphor paste in a row. Here, forming a row means a series of arrangements of the discharge ports in which the arrangement of the plurality of discharge ports 2 can be expressed by some rules. For example, there are a series in which the distances between the ejection openings are arranged at unequal pitches, a series in which a plurality of ejection openings are arranged meandering, and a series in a staggered manner.

  The shape and arrangement of the discharge port 2 can be selected as appropriate so that the paste can be accurately applied to a predetermined groove on the substrate by a single application operation on the entire surface of the glass substrate. For example, the discharge port 2 having a diameter of 50 to 1000 μm. It is preferable that 1 and 500 to 4000 are formed at a pitch of 0.03 to 5.0 mm in the longitudinal direction. In the example of FIG. 1, the discharge ports 2 are arranged in a line on a straight line, but the present invention is not limited to this. Further, the surface on which these discharge ports are formed may be a curved surface, but in this example, it is a flat surface for the convenience of processing the coating nozzle.

  As a processing method of the discharge port 2, a known processing method such as electric discharge processing, laser processing, or drill processing can be appropriately selected according to the nozzle material and the discharge port shape.

At both ends of the discharge port 2, recesses are provided to prevent erosion that occurs at the end discharge ports 2 a at both ends when ultrasonic cleaning is performed. (Here, since the recess has a shape similar to the discharge port, the recess is hereinafter referred to as a dummy, and the portion provided near the discharge port is positioned near the discharge port dummy and the positioning mark. (Mark dummy)
As shown in the partially enlarged views of FIGS. 3A and 3B, discharge port dummies 3a, 3b, and 3c are provided on the surface on which the discharge port 2 is formed so as to be further in line with the discharge port 2. ing. Discharge port dummy 3a, 3b, 3c is provided so that a diameter and depth may become small gradually in the direction which leaves | separates from the edge part discharge port side. As a result of the cavitation gradually weakening toward the small discharge port dummy 3c at the end, the cavitation that has been concentrated at the end becomes difficult to concentrate, and the cavitation is dispersed to a plurality of dummy provided, and the cavitation collapses. Since the impact force that occurs sometimes decreases in dispersion, erosion is less likely to occur at the end discharge port 2a and the discharge port dummies 3a, 3b, and 3c.

  In this example, three discharge port dummies are provided on one side (three on the opposite side), but more may be provided if installation space permits. From the viewpoint of processing cost, it may be provided in accordance with the installation space as appropriate within the range of 3 or more and 10 or less.

  The dummy may be formed by, for example, cutting with a drill or a reamer, or may be transferred by forging using a die or a punch, and is not particularly limited to this, depending on the material of the coating nozzle 1 and the shape of the dummy. Various processing methods can be used. Further, a protrusion-shaped dummy may be attached and installed.

  The diameter of the discharge port dummy 3a adjacent to the end discharge port 2a is preferably 25 μm or more and 500 μm or less. When this value is less than 25 μm or more than 500 μm, the dummy effect is lost and ultrasonic erosion occurs at the end discharge port 2a. More preferably, they are 50 micrometers or more and 300 micrometers or less. The diameter of the discharge port dummy 3c farthest from the end discharge port 2a is preferably 25 μm or less.

  The depth of the discharge port dummy 3a is preferably 25 μm or more with reference to the surface on which the discharge port 2 is provided. If this value is less than 25 μm, erosion occurs at the end discharge port 2a in the same manner as when no dummy is present, and there is no dummy effect. The depth of the discharge port dummy 3c farthest from the end discharge port 2a is preferably 25 μm or less.

  In this example, the plurality of discharge port dummies are provided such that both the diameter and depth thereof gradually decrease in the direction away from the end discharge port side, but the present invention is not limited to this. It may be provided such that either one of the diameter or the depth of the discharge port dummy gradually decreases in the direction away from the end discharge port side, and the other gradually increases. However, in that case, it is necessary that either one of the diameter and the depth of the discharge port dummy is reduced at a sufficient rate as compared with the other. The dummy may be formed so that the volume formed by the outer surface of the discharge port dummy and the surface where the discharge port is located decreases in a direction away from the end discharge port side.

  Further, the position where the plurality of discharge port dummies are provided is preferably such that the distance between the end portion discharge port 2a and the discharge port dummy 3a or the adjacent dummy (the shortest distance between the respective outer edges) is 5000 μm or less. If it exceeds 5000 μm, the dummy effect is lost, and ultrasonic erosion may occur at the discharge outlet at the end. More preferably, this distance is in the range of 300 μm to 3000 μm.

  Further, the discharge port dummy need not necessarily be a recessed portion as long as it can induce ultrasonic erosion, and may be a protruding portion, or may be a combination of the recessed portion and the protruding portion. What is important in the present invention is to have a plurality of dummies that gradually become shallower or lower in the direction away from the end discharge port.

  FIG. 4 is a partially enlarged view and a partial side sectional view of the discharge port surface in the vicinity of the positioning mark of the coating nozzle of the present invention. Similarly to the discharge port dummies 3a to 3c for the end discharge port 2a, the positioning mark dummies 3i, 3j, and 3k are aligned with the positioning mark 21 in the direction away from the plurality of discharge ports from the vicinity of the positioning mark 21. It is provided.

  The positioning mark dummies 3i, 3j, and 3k are provided so that the diameter and depth gradually decrease in the direction away from the positioning mark 21. As a result of the cavitation gradually becoming weaker toward the smallest positioning mark dummy 3k, the cavitation that has been concentrated on the positioning mark 21 until now becomes difficult to concentrate. Since the impact force that occurs at the time of collapse decreases, erosion is less likely to occur at the positioning marks 21 and the positioning mark dummies 3i, 3j, and 3k.

  The diameter of the positioning mark dummy 3i adjacent to the positioning mark 21 is preferably 25 μm or more and 500 μm or less. When this value is less than 25 μm or more than 500 μm, the dummy effect is lost and ultrasonic erosion occurs at the end discharge port 2a. More preferably, they are 50 micrometers or more and 300 micrometers or less. The diameter of the positioning mark dummy 3i farthest from the positioning mark 21 is preferably 25 μm or less.

  The depth of the positioning mark dummy 3i is preferably 25 μm or more with reference to the surface where the ejection port 2 is provided. If this value is less than 25 μm, erosion occurs at the end discharge port 2a in the same manner as the positioning mark dummy does not exist, and there is no dummy effect. The depth of the positioning mark dummy 3i farthest from the positioning mark 21 is preferably 25 μm or less.

  In this example, the plurality of positioning mark dummies are provided such that both the diameter and depth thereof gradually decrease in the direction away from the positioning mark 21, but the present invention is not limited to this. The positioning mark dummy may be provided such that either one of the diameter and the depth of the positioning mark dummy gradually decreases in the direction away from the positioning mark 21 and the other gradually increases. However, in that case, either the diameter or the depth of the positioning mark dummy needs to be reduced at a sufficient rate as compared with the other. The positioning mark dummy may be formed so that the volume formed by the outer surface of the positioning mark dummy and the surface where the discharge port is located decreases in the direction away from the end discharge port side.

  In addition, the position where the plurality of dummies are provided is preferably such that the distance between the positioning mark 21 and the positioning mark dummy 3i or the adjacent dummy (the shortest distance between the outer edges) is 5000 μm or less. If it exceeds 5000 μm, the dummy effect is lost, and ultrasonic erosion may occur at the discharge outlet at the end. More preferably, this distance is in the range of 300 μm to 3000 μm.

  Further, the dummy is not necessarily a recessed portion as long as ultrasonic erosion can be induced, and may be a protruding portion, or a combination of the recessed portion and the protruding portion. What is important in the present invention is to have a plurality of dummies that gradually become shallower or lower in the direction away from the end discharge port.

Here, the frequency range of the ultrasonic wave used for cleaning the coating nozzle is preferably 5 kHz or more and 100 kHz or less, and the ultrasonic intensity is 0.5 W / cm ² or more. Outside this range, the strength of ultrasonic cavitation is reduced, and the cleaning ability is not sufficient, which is not preferable.
The coating nozzle of the present invention requires ultrasonic cleaning in order to continue pattern coating of a highly viscous coating liquid, and is suitable as a coating nozzle capable of pattern coating a paste having a viscosity of 1 Pa · s or more. However, when a high-viscosity paste having a viscosity in the range of 1 to 1000 Pa · s or a high-viscosity paste having a viscosity in the range of 10 to 100 Pa · s is used for a coating nozzle, Even if this application nozzle is ultrasonically cleaned without deliberately reducing the ultrasonic power output, it is possible to continue accurate pattern application without cutting the edges of the discharge port before and after this cleaning. preferable.

  A typical example of the high-viscosity paste is a phosphor paste application nozzle that applies a phosphor paste for plasma television production.

  Various known cleaning liquids can be used depending on the coating liquid to be cleaned and the material of the coating nozzle. Particularly in the case of a phosphor paste mainly composed of phosphor powder, an organic solvent, and an organic binder (resin component), a cleaning solvent (usually an organic solvent) that can dissolve the organic solvent and the resin component is used. good. Such organic solvents are appropriately selected from various solvents such as acetone, ethanol, diacetone alcohol, IPA (isopropyl alcohol), MEK (methyl ethyl ketone), fluorine-based solvents, various non-hazardous solvents (for example, trade name Elise: Asahi Kasei). can do. Further, when such cleaning is performed over several stages, the cleaning effect is further enhanced. For example, diacetone alcohol cleaning as the primary cleaning, acetone cleaning as the secondary cleaning, pure water cleaning as the final cleaning, etc. can be performed as the first cleaning. Increase it.

Example 1
A coating nozzle 1 shown in FIG. 1 was manufactured. The discharge ports 2 were circular with a diameter of 110 μm, and 1920 pieces were provided on a straight line at a pitch of 500 μm on a stainless steel plate having a width of 100 mm, a length of 1 m, and a thickness of 500 μm. Discharge port dummy 3a, 3b, 3c was provided in a straight line in order in the direction away from the end discharge port 2a at a pitch of 500 μm from the end discharge ports 2a located at both ends. The discharge port dummy 3a was a recess having a diameter of 100 μm and a depth of 300 μm, the discharge port dummy 3b was a recess having a diameter of 50 μm and a depth of 100 μm, and the discharge port dummy 3c was a recess having a diameter of 20 μm and a depth of 20 μm.

  Further, positioning mark dummies 3i, 3j, and 3k were sequentially provided at a pitch of 1 mm in a direction away from the positioning mark 21 on a straight line passing through the positioning mark 21 perpendicular to the straight line in which the discharge ports 2 are arranged. The positioning mark dummy 3i was a recess having a diameter of 200 μm and a depth of 100 μm, the positioning mark dummy 3j was a recess having a diameter of 100 μm and a depth of 50 μm, and the positioning mark dummy 3k was a recess having a diameter of 25 μm and a depth of 20 μm.

This coating nozzle 1 is put into a washing tank containing diacetone alcohol, and after applying ultrasonic waves with an ultrasonic intensity of 1.0 W / cm ² and a frequency of 25 kHz for 1 hour, the coating nozzle is washed with pure water. The ultrasonic cleaning was repeated 10 times by irradiating ultrasonic waves with an ultrasonic intensity of 1.0 W / cm ² and a frequency of 25 kHz for 1 hour. After the ultrasonic cleaning was completed, the discharge port, discharge port surface, and positioning mark of the coating nozzle 1 were observed with a microscope. However, it was confirmed that there was no damaged portion and no ultrasonic erosion occurred.

  Furthermore, when this coating nozzle 1 was assembled and the phosphor paste was applied to the stripe-shaped grooves provided on the back plate, it was possible to apply all of them to the grooves.

Comparative Example 1
Except that all of the discharge port dummies 3a, 3b, 3c and the positioning mark dummies 3i, 3j, 3k shown in FIG. 5 (a) are 200 μm in diameter and 100 μm in depth, the same application nozzle 1a as in Example 1 was manufactured. .

  When this application nozzle 1a was subjected to ultrasonic cleaning for 1 hour under the same conditions as in Example 1, as shown in FIG. 5B, an ultrasonic erosion pattern was formed from the discharge outlet dummy 3c at the end and the positioning mark 3k at the end. 4 occurred. Using this application nozzle 1k, paste application was performed in the same manner as in Example 1, and application was possible without problems.

  Furthermore, after repeating ultrasonic cleaning 10 times including the first cleaning, when the surface of the coating nozzle 1a is observed with a microscope, the ultrasonic erosion pattern 4 is enlarged as shown in FIG. The edge portion of the end discharge port 2a and the positioning mark 21 was eroded by erosion, and the coating nozzle became unusable by ultrasonic cleaning.

It is front sectional drawing of the coating nozzle of this invention. It is a schematic plan view which shows the discharge port surface of the coating nozzle of this invention. It is the elements on larger scale near the edge part discharge outlet of the coating nozzle of this invention, and a partial side surface sectional view. It is the elements on larger scale and the partial side surface sectional drawing of the positioning mark vicinity of the coating nozzle of this invention. 6 is an enlarged view of a coating nozzle used in Comparative Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a Coating nozzle 2 Discharge port 2a End part discharge port 3 Dummy 3a, 3b, 3c Discharge port dummy 3i, 3j, 3k Positioning mark dummy 4 Ultrasonic erosion pattern 5 Paste supply port 6 Manifold 7 Paste supply unit 8 Phosphor paste 9 Pressurized air supply port 10 Application nozzle unit 21 Positioning mark

Claims (4)

A plurality of discharge ports for discharging the paste are formed in a row in the surface of the discharge port, and a plurality of dents or in the direction away from the other discharge ports from the vicinity of the discharge ports at both ends of the row An application nozzle in which protrusions are formed in a row, wherein the depth of the plurality of recesses or the height of the protrusions, or the diameter of the plurality of recesses or protrusions in the discharge port surface is An application nozzle, which gradually decreases as the distance from the discharge ports at both ends of the row increases. A plurality of discharge ports for discharging the paste are formed in a row in the discharge port surface, and a positioning mark is formed in the discharge port surface near the discharge port row, and the positioning is further performed. A coating nozzle in which a plurality of recesses or projections are formed in a row in a direction away from the plurality of discharge ports from the vicinity of the mark, the depth of the plurality of recesses or the height of the projections, or the An application nozzle, wherein a diameter of the plurality of dents or protrusions in a discharge port surface gradually decreases as the distance from the positioning mark increases. A method for applying a paste, comprising applying the paste by discharging the paste onto a substrate using the application nozzle according to claim 1, which has been subjected to ultrasonic cleaning. A method for producing a member for a plasma display, comprising applying a phosphor paste using the paste application method according to claim 3.

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