JP2003236438A - Device for removing coating liquid and method for manufacturing plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that it is difficult to reduce a defective fraction and enhance a productivity in a conventional device for removing a coating liquid or a conventional method for removing a coating liquid for forming a dielectric layer, a rib or an electrode of a plasma display panel. <P>SOLUTION: The device for removing a coating liquid is provided with a sheet-like wiper 10; a drawing mechanism; a feeding out mechanism; and a roll 11. The roll 11 has a rotation shaft 16 perpendicular to a film-forming surface 41 and is rotatable. The roll 11 is butted to the film-forming surface 41 of a die head 17 from a back surface of the sheet wiper 10. The sheet wiper 10 is fed out and the rotation shaft 16 is relatively moved in a direction perpendicular to the die head 17. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (Plasma Display Panel).
l, PDP) and its manufacturing method, and more particularly, to a coating apparatus and a coating method for forming a dielectric, an electrode or a rib formed on a substrate of a plasma display panel, and more specifically to coating a die head of the coating apparatus. The present invention relates to a coating liquid removing device for removing a coating liquid on a film forming surface and a coating liquid removing method.

[0002]

2. Description of the Related Art Conventionally, as a method for manufacturing a PDP, a method described in, for example, Japanese Patent Laid-Open No. 2000-102759 is known.

First, the configuration of a PDP will be described with reference to FIG. 1, which is a configuration diagram of a conventional PDP.

As shown in FIG. 1, the PDP includes a front substrate 1, a rear substrate 2, a dielectric layer 3, a scanning electrode (with a transparent electrode) 4, a sustain electrode (with a transparent electrode) 5, a protective layer 6, and an address electrode. 7, a rib 8 and a fluorescent layer 9.

The front substrate 1 and the rear substrate 2 are bonded to each other by a seal layer, and a gas for generating ultraviolet rays at the time of discharge is sealed after the inside is evacuated. And
Ultraviolet rays are generated from the enclosed gas by applying a voltage to the discharge space, and when they hit the fluorescent layer 9, they emit light,
An image is obtained.

The above structure is a general type which is classified as a three-phase electrode, surface discharge type and reflection type color PDP.

Here, the conditions required for the dielectric layer 3 covering the electrodes (4, 5) are to coat the electrodes uniformly and densely, to have a high transmittance and an insulating property.
It is possible to obtain a uniform discharge characteristic with a smooth surface, to form the surface with a protective material, to use a surface material with a low driving voltage, and the like.

A typical method of forming such a dielectric layer 3 is a screen printing method or a die coating method. In the screen printing method, usually, a desired film thickness is obtained by applying and forming a plurality of times in accordance with a paste viscosity of several tens Pa · s to several hundred Pa · s. However, in this method, there are problems such as uneven coating due to screen mesh marks, a long coating process due to multiple coatings, and an increase in the cost of the consumable screen. Therefore, recently, the introduction of a die coating method, which allows non-contact coating on the glass substrate and the electrodes (4, 5, 7) without leaving a mesh mark, has been actively studied.

In such a die coating method, it is required to continuously apply a uniform coating film on a large-area glass substrate intermittently and with good reproducibility. For that purpose, it is necessary to always keep the area around the die discharge port clean at the start of coating.
As means for solving these problems, Japanese Patent Laid-Open No. 7-1680
As disclosed in Japanese Patent No. 15 or the like, a coating liquid removing apparatus and a coating liquid removing method have been proposed in which a cleaning tool is brought into sliding contact with the ejection port to scrape off the coating liquid adhering to the ejection port and its periphery.

FIG. 4 shows a conventional coating liquid removing apparatus and method by scraping using a blade 23. Also, FIG.
4 is a cross-sectional view seen from B in FIG. 4. The coating liquid of the present invention is
The coating liquid discharged from the die discharge port 40 opened at the lower end of the lip 18 located below the die head 17, but not used, is the coating liquid 20 adhering to the coating film forming surface.
Stays on the coating film forming surface 41. In order to remove the coating liquid 20 adhering to the coating film forming surface from the coating film forming surface 41, the tip of the blade 23 made of a polymer resin is slidably contacted with the coating film forming surface 41 to form the blade 23 or By moving the die head 17, the coating liquid 20 adhering to the coating film forming surface is scraped off.

FIG. 6 shows a conventional three-face contact type blade 2
9 shows a coating liquid removing device and method according to No. 9. FIG. 7 shows FIG.
FIG. 8 shows a cross-sectional view as seen from the middle C, and FIG. 8 shows a cross-sectional shape of a conventional three-face contact type blade 29. This conventional three-sided contact type blade 29 makes the contact with the lip 18 three-sided, and is intended to suppress the adhesion of the lip side surface part coating liquid 27 to the side surface part of the lip 18.

[0012]

However, when it is attempted to remove the coating liquid 20 adhering to the coating film forming surface by such a method, the blade 23 and the die discharge port 40 are formed in the vicinity of the contact portion of the coating film forming surface 41. , Coating liquid pool 26
Occurs. As the coating liquid reservoir 26 becomes larger, the coating liquid overflows to the side surface of the lip 18,
There is a problem that the lip side surface coating liquid 27 adheres to the side surface of the lip. If the coating is continued in this state, the lip side coating liquid 27 is dried to form aggregates and the like, which are peeled off and mixed into the coating film, thereby losing the uniformity of the coating film. At the same time, it has been a serious problem that it leads to product defects and the defective rate of the products increases.

In some cases, in order to prevent the coating liquid pool 26 from being generated, a suction nozzle 24 for sucking the scraped coating liquid or a cleaning liquid supply nozzle 25 for cleaning the blade may be provided. By supplying the cleaning liquid or the solvent to the portion of the blade 23 near the die discharge port 40 or the suction port of the suction nozzle 24 by the cleaning liquid supply nozzle 25, the coating liquid removal effect of the blade 23 is obtained and the scraped coating liquid is obtained. Is promptly sent into the suction nozzle 24. However, particularly in the case of a highly viscous coating liquid, a sufficient effect cannot be obtained, and it is very difficult to always keep the contact surface of the blade 23 with the die discharge port 40 clean.

At this time, if the discharge speed and the discharge amount of the cleaning liquid are increased to obtain a sufficient effect, the cleaning liquid is scattered, which leads to environmental pollution of the surroundings. In addition, when the scattered cleaning liquid adheres to the die discharge port 40, the coating liquid inside the die is partially diluted,
It has been difficult to realize uniform coating due to variations in the amount of coating liquid discharged.

Further, as described above, in the method in which the blade 23, which is a cleaning tool, is brought into direct contact with the coating film forming surface 41 to scrape it off, delicate alignment between the blade 23 and the coating film forming surface 41 is required. This caused a loss of time and reduced productivity.

In addition, the conventional blade 23 has a low effect of removing the coating liquid, and in order to compensate for it, the coating film forming surface 41 is repeatedly used.
Make a sliding contact on the surface or use a large force with a cleaning tool to form the coating film surface 4
As a result, there is a problem that abrasion powder generated by abrasion adheres to the coating film surface on the substrate to increase the defective rate of the product.

Further, as shown in FIG. 6, in the case of the three-sided contact type blade 29, the three-sided contact type blade 29 has the coating film forming surface 41 and the lip 18 in order to enhance the effect of removing the coating liquid.
Since the shape is adapted to the shape of No. 3, it is necessary to perform a fine alignment for each operation of removing the coating liquid, resulting in poor workability and loss of time.

Further, a die head 17 having a coating film forming surface 41 and a lip 18 having different shapes is often used according to the coating liquid and the object to be coated, and it is necessary to prepare a three-face contact type blade 29 corresponding to each of them. (See Figure 8),
This led to an increase in costs.

Further, in the conventional three-face contact type blade 29, the coating liquid may adhere to the contact surface between the three-face contact type blade 29 and the die discharge port 40 while the coating liquid removing operation is repeated. there were. When the coating liquid removing operation is further repeated in this state, as shown in FIG. 9, the contact surface-adhering coating liquid 30 remains between the three-face contact type blade 29 and the die discharge port 40 to form a gap, and the two are in close contact with each other. Since it is no longer possible, the effect of removing the coating liquid is significantly reduced. In this way, when the contact surface of the three-sided contact blade 29 with the coating film forming surface 41 is not clean, even if the coating liquid adhering to the coating film forming surface 41 is to be removed or cleaned, Since the film forming surface 41 cannot be brought into close contact with the film forming surface 41, a sufficient effect of removing the coating liquid cannot be obtained, and there is a problem that unevenness and defects of the coating film due to the residual coating liquid occur.

Although the above description has been made with respect to the formation of the dielectric layer 3, the same can be said with respect to the coating formation of the ribs 8 and the electrodes (4, 5, 7).

The purpose of the coating liquid removing apparatus and the coating liquid removing method of the present invention is, in consideration of the above-mentioned conventional problems, a high removal rate of the coating liquid from the coating film forming surface of the die head and a coating liquid pool. It is an object of the present invention to provide a coating liquid removing apparatus and a coating liquid removing method that do not occur and do not require fine adjustment such as alignment of the blade 23 with respect to a coating film forming surface.

The object of the coating apparatus and the coating method of the present invention is to form the dielectric, ribs or electrodes of the plasma display panel with a low defect rate and improved productivity in consideration of the above-mentioned conventional problems. Apparatus and method.

In consideration of the above-mentioned conventional problems, the object of the plasma display panel manufacturing apparatus and manufacturing method of the present invention is to improve the productivity of the dielectric, rib or electrode of the plasma display panel with a low defect rate. An object of the present invention is to provide a manufacturing apparatus and a manufacturing method of a plasma display panel that are improved and formed.

[0024]

A first aspect of the present invention (corresponding to claim 1) for solving the above-mentioned problems is a coating liquid removing apparatus for removing a coating liquid from a coating film forming surface of a die head. There is a sheet-like material, a feeding mechanism for feeding out the sheet-like material, a retracting mechanism for retracting the sheet-like material, and a contact roll that contacts the sheet-like material, and the contact roll Has a rotation axis that is substantially orthogonal to the longitudinal direction of the coating film forming surface, is rotatable about the rotation axis, and abuts from the back surface of the sheet-like material to bring the surface of the sheet-like material into contact with the surface of the sheet-like material. It is in contact with the coating film forming surface, the sheet-like material is sent out from between the contact roll and the coating film forming surface, the rotation axis, with respect to the longitudinal direction of the coating film forming surface. The die head in a substantially orthogonal state Relatively moves against a coating liquid removing device.

In the second aspect of the present invention (corresponding to claim 2), the direction in which the sheet-like material is sent out coincides with the direction in which the rotary shaft moves relative to the die head.
It is a coating liquid removing apparatus of the first present invention.

A third aspect of the present invention (corresponding to claim 3) is the coating liquid removing apparatus according to the first or second aspect of the present invention, in which the sheet-shaped material or the contact roll comprises a material having elasticity.

A fourth aspect of the present invention (corresponding to claim 4) comprises a contact roll support for supporting the contact roll,
First to third, wherein the contact roll support includes a shock absorber
The coating liquid removing apparatus according to any one of the present invention.

A fifth aspect of the present invention (corresponding to claim 5) is the coating liquid according to any one of the first to fourth aspects of the present invention, wherein the sheet-like material or the contact roll contains a conductive material. It is a removal device.

A sixth aspect of the present invention (corresponding to claim 6) is the coating liquid removing apparatus according to any one of the first to fifth aspects of the present invention, which is equipped with a cleaning liquid discharge nozzle for containing the cleaning liquid in the sheet-like material. is there.

A seventh aspect of the present invention (corresponding to claim 7) is a method for removing a coating liquid from a coating film forming surface of a die head, which is a sheet-like material sent by a sending mechanism and drawn by a drawing mechanism. On the back surface of the contact roll having a rotation axis, the rotation axis is contacted in a direction substantially orthogonal to the coating film forming surface of the die head, whereby the surface of the sheet-like material to the coating film forming surface. By contacting and driving the retracting mechanism or the rotating shaft, a sheet-like material is sent out between the contact roll and the coating film forming surface, and at the same time, the rotating shaft is moved to the coating film forming surface. In the coating liquid removing method, the coating liquid is moved relative to the die head in a state substantially perpendicular to the longitudinal direction.

An eighth aspect of the present invention (corresponding to claim 8) is a coating apparatus for forming a dielectric rib or electrode of a plasma display panel on a substrate by using a die head.
A coating apparatus comprising the coating liquid removing apparatus according to the first aspect of the present invention.

A ninth aspect of the present invention (corresponding to claim 9) is a coating method for forming a dielectric, rib or electrode of a plasma display panel on a substrate by using a die head. This is a coating method including a coating liquid removing step.

The tenth invention of the present invention (corresponding to claim 10) is
A method for manufacturing a plasma display panel, comprising forming a dielectric, a rib or an electrode on a substrate by a die coating method, wherein the dielectric, the rib or the electrode is
Is a method for manufacturing a plasma display panel, which is formed by the method of the present invention.

The eleventh invention (corresponding to claim 11) is
A plasma display panel manufacturing apparatus for forming a dielectric, a rib or an electrode on a substrate by a die coating method, comprising the coating apparatus of the eighth aspect of the present invention.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to FIG.
It will be described in accordance with 2, 3, 10-12.

(Embodiment 1) FIG. 2 shows a coating liquid removing apparatus and method of the present invention in Embodiment 1. Figure 3
FIG. 3 is a cross-sectional view seen from A in FIG. 2. Note that the following description will be made assuming that the dielectric layer 3 is formed on the front substrate 1.

Known die head 17 for die coating
Has a longitudinal shape, has a lip 18 on the lower side, and a die discharge port 40 for discharging the coating liquid of the present invention is opened at the tip of the lip 18. Further, the lower surface of the lip 18 has a coating film forming surface 41 for forming the coating liquid discharged from the die discharge port 40 as the dielectric layer 3 on the glass substrate which is the front substrate 1. The die head 17 is supported by an elevating mechanism (not shown) that moves up and down.

The sheet-shaped wiper 10 which is the sheet-shaped product of the present invention is formed by a take-up roller (not shown) which is a drawing mechanism of the present invention and a take-up roller (not shown) which is a feeding mechanism of the present invention. , Both ends in the longitudinal direction are wound. The take-up roller and the take-out roller are each rotatable, and the take-up roller is connected to a take-up roller motor (not shown).

The sheet-like wiper 10 of the present invention is used as a wiper for a clean room, and has ultrafine fibers with low dust generation and abrasion resistance (fiber diameter of 20 μm or less is desirable.
It is more desirable if the thickness is less than μm. ) Of the structure that is woven with a high density of so-called split fibers, or composed of a non-woven fabric. From the viewpoint of abrasion resistance, it is desirable to have a structure in which fibers are woven at a high density, but nonwoven fabrics are often superior in terms of cost.

Then, on the back surface of the sheet-shaped wiper 10,
The roll 11, which is the contact roll of the present invention, is in contact. At this time, the rotating shaft 16 of the roll 11 is set to the die head 1
7 is disposed substantially orthogonal to the longitudinal direction of the coating film forming surface 41, and the surface of the sheet-shaped wiper 10 is in contact with the coating film forming surface 41 in this state.

Here, the roll 11 has a cylindrical shape,
The roll rotary shaft 16 which is the rotary shaft of the present invention penetrates through the center and is engaged. That is, for example, a key groove (not shown) is formed in a part of the roll rotation shaft 16 and the roll 11, and a key (not shown) is inserted at a position where the key grooves of both rolls coincide with each other. The shaft 16 and the roll 11 are fixed.

Here, it is desirable that the roll 11 is made of a material having solvent resistance, and the roll 11 and the sheet wiper 10 during the delivery of the sheet wiper 10.
It is desirable that the surface of the roll 11 be provided with irregularities (not shown) in order to suppress the deviation from the above and to precisely control the feeding speed.

One end of the roll rotating shaft 16 is connected to the roll rotating motor 15, and the roll rotating motor 15 is connected to the roll supporting member 19 which is the contact roll supporting member of the present invention, so that the roll 11 can be moved horizontally. The roll rotation motor 15 is held so that the roll 11 is parallel to the surface including the coating film forming surface 41 of the die head 17. The roll support 19 is connected to the ball screw engaging portion 42 of the coating film forming surface longitudinal direction drive mechanism 12.

The coating film forming surface longitudinal direction drive mechanism 12 has a longitudinal shape and has a base 43 in the horizontal direction. The ball screw engaging portion 42 has a flat bottom surface, and
It is in contact with the surface of 3. The ball screw rotating motor 14 is installed at one end of the pedestal 43, and the rotation axis of the ball screw rotating motor 14 extends in a direction substantially parallel to the coating film forming surface 41 and has a threaded ball screw 13. Are connected. Also, inside the ball screw engaging portion 42,
The screw thread is cut, and the ball screw engaging portion 42 engages with the screw thread of the ball screw 13 and is inserted into the ball screw 13.

Next, the operation of the coating liquid removing apparatus of the first embodiment configured as described above will be described.

To form the dielectric layer 3 on the front substrate 1 shown in FIG. 1, in FIG.
While moving in a direction orthogonal to the plane of the drawing with respect to the front substrate 1,
The coating liquid is discharged from the die discharge port 40 of the die head 17. In order to stop the coating after coating a desired area and remove the coating liquid 20 adhering to the coating film forming surface 41, the die head 17 is moved by the elevating mechanism (not shown) to the roll 11 Sheet wiper 1 abutted by
It is descended so as to come into close contact with the 0 part. At this time, the roll screw shaft 16 is rotated by a ball screw so that the horizontal position of the roll rotating shaft 16 is located at the coating liquid removal start position 44 of the coating film forming surface 41 (the right end of the die discharge port 40 in FIG. 2 or slightly right thereof). Motor 14 is operating.

Then, the roll rotating motor 15 is operated continuously or intermittently to rotate the roll 11 in the direction to send the sheet-shaped wiper 10 toward the winding roller, so that the sheet-shaped wiper 10 is continuously or intermittently fed. Send out intermittently. At this time, the sheet-shaped wiper 10 sent out
Is taken up by the take-up roller as the take-up roller motor rotates. At this time, the rotation torque of the winding roller motor may be a torque that can apply an appropriate tension to the sheet-shaped wiper 10 in the portion from the roll 11 to the winding roller.

At the same time when the roll 11 is rotated, the ball screw rotating motor 14 is operated to move the roll rotating shaft 16 with respect to the die head 17 in a state of being orthogonal to the longitudinal direction of the coating film forming surface 41. To be done. That is, in this embodiment, the horizontal position of the roll rotating shaft 16 is moved from the coating liquid removal start position 44 of the coating film forming surface 41 to the coating liquid removal end position 45. That is, the horizontal position of the roll rotation shaft 16 is moved in a direction that coincides with the direction in which the sheet-shaped wiper 10 is fed out between the roll 11 and the coating film forming surface 41.

Explaining the operation in this case in detail, first, the ball screw rotating motor 14 is rotated in the direction in which the ball screw 13 is unscrewed when viewed from the ball screw rotating motor 14 side. At this time, the ball screw engaging portion 42 inserted into the ball screw 13 is arranged such that the bottom portion thereof is in contact with the base 43, and therefore the ball screw rotating motor 1
4 receives the pushing force from the bottom, and the bottom is
While slidingly contacting with the ball screw 3, the slider moves from the side closer to the ball screw rotating motor 14 to the side farther from the ball screw rotating motor 14. In this way, the roll rotation shaft 16 moves from the coating liquid removal start position 44 toward the coating liquid removal end position 45.

On the other hand, the sheet-shaped wiper 10 and the coating film forming surface 4
Since 1 is required to be closely attached, a certain pressing force is applied. At this time, the sheet-shaped wiper 10
Is somewhat elastically deformed by the pressing force, so that the contact portion between the sheet-shaped wiper 10 and the coating film forming surface 41 is a surface having a certain size. In this state, the sheet-shaped wiper 10 is fed out, and the die head 17 moves relative to the roll rotation shaft 16, so that the coating film forming surface 41 is brought into sliding contact with the sheet-shaped wiper 10, and its fiber structure or porous Due to the quality structure, the coating liquid 20 adhering to the coating film forming surface 41 or foreign matter such as dust or agglomerates is absorbed or removed and removed.

In this way, when the coating liquid 20 adhering to the coating film forming surface 41 is removed, the clean surface of the sheet-shaped wiper 10 is always kept at the die discharge port 40 or the coating film forming surface. It is possible to remove it by bringing it into close contact with 41.
The removed coating liquid 21, which is the removed coating liquid, is sequentially carried on the sheet-shaped wiper 10 in the direction of the winding roller as shown in FIG.

(Embodiment 2) FIG. 10 shows a coating liquid removing apparatus and method according to Embodiment 2 of the present invention. The description of the same components as in the first embodiment will be omitted.

In the coating liquid removing apparatus according to the second embodiment,
The roll 11 is made of a material having elasticity in addition to solvent resistance. Examples of such materials include ultra high molecular weight polyethylene, fluororubber, silicon rubber, ethylene propylene rubber, urethane resin, fluororesin, polypropylene resin, polyester resin, acrylic resin and the like. Further, as the material of the sheet-shaped wiper 10, as described in the first embodiment, it is made of an elastic material such as ultrafine fibers or nonwoven fabric.

Next, the operation of the coating liquid removing device having such a structure will be described. First, as in the first embodiment, the die head 17 is lowered and the sheet-shaped wiper 10 is pressed so as to be in close contact with the coating film forming surface 41 of the die head 17. At this time, a part of the lip 18 of the die head 17 is
The sheet-shaped wiper 10 or the roll 11 sinks due to its elasticity.

On the other hand, the roll 11 is pressed by the lip 18 to form the recess 50 including the pressed peripheral portion. At this time, the sheet-shaped wiper 10
Are arranged along the inside of the recess 50 by being displaced or extending from the periphery of the recess 50. As a result, lip 1
The coating film forming surface 41 of 8 and the side surface portions on both sides in the longitudinal direction of the lip 18 are in contact with each other so as to be wrapped by the sheet-shaped wiper 10 arranged in the recess 50 formed on the roll 11. In this way, the contact surface of the die head 17 with the sheet-shaped wiper 10 extends not only to the coating film forming surface 41 but also to the side surfaces on both sides in the longitudinal direction of the lip 18, and the contact state becomes a three-sided contact.

Next, as in the first embodiment, the roll 11 is rotated, and at the same time, the roll 11 is moved in the longitudinal direction of the coating film forming surface 41 by the coating film forming surface longitudinal direction drive mechanism 12.
Move 1

By doing so, the coating liquid does not adhere to both side surfaces of the lip 18 in the longitudinal direction,
A higher effect of removing the coating liquid can be obtained. In addition, the delicate alignment required in the conventional three-sided contact blade system is not necessary, and it is possible to flexibly deal with various discharge ports 40 and lip-shaped die heads 17. In addition, the coating solution does not accumulate on the side surface of the die head 17, and there is no need to make fine adjustments to the coating film forming surface 41. The die head 17 having different coating film forming surface 41 and lip 18 shapes. There is no need to make a cleaning tool for each.

Although the roll 11 has been described above as being made of a material having elasticity, the roll 1
1 may include a member having elasticity. For example, even if a sheet made of a material having elasticity is installed on the surface of the roll 11, the same effect as above can be obtained.

In the above description, elasticity is given to both the roll 11 and the sheet-like wiper 10. However, even when either the roll 11 or the sheet-like wiper 10 is given elasticity and they are used. The same effect can be obtained.

For example, when elasticity is imparted only to the sheet-shaped wiper 10, the recess 50 is formed on the sheet-shaped wiper 10 if the thickness of the sheet-shaped wiper 10 is sufficient. Can be obtained.

(Embodiment 3) FIG. 11 shows a coating liquid removing apparatus and method according to Embodiment 3 of the present invention. The same constituent elements as those in the first and second embodiments are designated by the same reference numerals, and the description thereof will be omitted.

In the coating liquid removing apparatus according to the third embodiment, one of the roll rotating shafts 16 is connected to the roll rotating motor 15 and the other is connected to the bearing 51. The roll support 19 is provided with the spring 22 which is the shock absorber of the present invention. In detail, the roll support 19 is connected to the ball screw engaging portion 42, the ball screw engaging portion 42 is slidably contacted on the bed 43, and the bed 43 is connected to the spring 22.

On the other hand, the bearing 51 is connected to the bearing support 52, and the bearing support 52 is connected to the spring 22 '.

The operation of the coating liquid removing device configured as described above will be described below.

Similar to the second embodiment, the sheet-shaped wiper 1
When 0 and the coating film forming surface 41 of the die head 17 are brought into close contact with each other, the die head 17 or the sheet-like wiper 10 is brought into close contact with each other so as to be pressed against each other, and therefore, an impact is generated at the moment of the close contact. At this time, this impact is applied to the springs 22 and 22 '.
Die head 17 and sheet wiper 1
0 means that the impact is kept to a minimum and the two are in close contact. Further, the force pressing the sheet wiper 10 and the die head 17 is
Since it is absorbed by the springs 22 and 22 ', the pressing force is precisely controlled by the elevator.

It is possible to prevent the die discharge port 40 and the lip 18 from being damaged by the impact when the die head 17 and the sheet-shaped wiper 10 come into contact with each other, and the coating film forming surface 41 and the lip caused by too high contact pressure. 18, wear of the sheet-shaped wiper 10 can be suppressed. as a result,
It is possible to suppress the generation of defective products caused by the abrasion powder mixed in the coating film. Therefore, it is possible to expand the choices regarding the material of the sheet-shaped wiper 10 and the roll 11.

In the description of the present embodiment, the roll rotating shaft 16 includes the roll rotating motor 15 and the bearing 51.
However, the roller support 19 may be supported only by the roll rotation motor 15, and in that case, the roll support 19 includes the spring 22 and does not include the spring 22 ′. However, the same effect as described above can be obtained.

The spring 2 is used as the shock absorber of the present invention.
Although the example of using 2 and 22 'has been described, it is not limited to this as long as it has elasticity, and an elastic body such as rubber or a shock absorber using gas pressure may be used. Similar effects can be obtained with other forms of shock absorbers.

(Embodiment 4) FIG. 12 shows a coating liquid removing apparatus and method according to Embodiment 4 of the present invention. The same components as those of the first to third embodiments are designated by the same reference numerals and the description thereof will be omitted.

In the coating liquid removing apparatus of the fourth embodiment, the cleaning liquid discharge nozzle 31 of the present invention for supplying the cleaning liquid 32 to the sheet-shaped wiper 10 intermittently or continuously in the region from the unwinding roller to the roll 11. It is equipped with. That is, in the coating liquid removing apparatus of the present embodiment, the drying unit 34 that does not contain the cleaning liquid 32 and the cleaning liquid containing unit 33 that contains the cleaning liquid 32 are alternately arranged once or more on the sheet-shaped wiper 10. It is characterized by being

The operation of the coating liquid removing device having such a configuration will be described below.

First, at the time of starting the coating liquid removing operation,
Since the sheet-shaped wiper 10 sandwiched between the roll 11 and the coating film forming surface 41 belongs to the drying section 34, the sheet forming wiper 10 efficiently absorbs the coating liquid 20 adhering to the coating film forming surface, and at the same time, has a fibrous structure or a porous structure. The quality structure absorbs and removes foreign matter such as dust and aggregates. Simultaneously with or after the roll 11 starts rotating, the cleaning liquid 32 is supplied to the sheet-shaped wiper 10 from the cleaning liquid discharge nozzle 31 of the present invention to form the cleaning liquid containing portion 33. Then, the cleaning liquid containing part 33 is
When the roll 11 is drawn between the roll 11 and the coating film forming surface 41 by the rotation of 1, the cleaning liquid contained in the cleaning liquid containing portion 33 still adheres to the coating film forming surface 41 or the side surface of the lip 18. The forming surface-adhering coating liquid 20 is removed by being washed or diluted.

As described above, the sheet-shaped wiper 1
0 and the coating film forming surface 41 are in contact with each other with a certain area. Therefore, if the feeding speed of the sheet is increased to some extent with respect to the relative moving speed of the die head 17,
The coating liquid can be removed at the same location on the coating film forming surface 41 by both the drying unit 34 and the cleaning liquid containing unit 33.

Further, instead of continuously supplying the cleaning liquid 32 from the cleaning liquid discharge nozzle 31 of the present invention to the sheet wiper 10, the cleaning liquid 32 can be intermittently supplied to the sheet wiper 10. In that case, the cleaning liquid containing portion 33 is arranged on the sheet-shaped wiper 10 in a striped pattern alternately with the drying portion 34 (not shown).

By doing so, the drying section and the cleaning liquid containing section 33 successively pass through the coating film forming surface 41, so that it is possible to obtain the same effect as in the case where cleaning and removal are repeated many times. In the case of the above coating liquid, the cleanliness can be further improved.

However, the cleaning liquid may be continuously supplied onto the sheet-shaped wiper 10 after the drying section 34 has passed the coating film forming surface 41.

(Embodiment 5) In the coating liquid removing apparatus according to Embodiments 1 to 4, it is possible to impart conductivity to the roll 11 by mixing fine particles of a conductive material into the roll 11. As an example of a material exhibiting conductivity,
Zinc oxide, carbon, titanium nitride, tin oxide, copper, gold,
Examples include ruthenium hydroxide. Further, the sheet-shaped wiper 10 can be given conductivity, and in that case, a method of mixing a conductive material and a method of knitting a conductive fiber such as nickel fiber can be considered.

(Example) In the coating liquid removing apparatus of the second embodiment, the rotational peripheral speed of the roll 11 and the moving speed in the longitudinal direction of the coating film forming surface 41 of the die head 17 with respect to the rotating shaft (hereinafter referred to as relative movement of the die head). Speed) and the effect of removing the coating liquid is verified by using an actual device,
Table 1 shows the results of comparison with the effect of removing the coating liquid by the conventional three-sided contact type blade 29 under the same conditions.

[0079]

[Table 1] At this time, as the coating liquid, a solid content of 60 including glass particles was used.
The composition ratio of wt%, resin component 5 wt%, solvent component 35 wt% and static viscosity of 70 pa · s was used. With this coating liquid, the coating speed on the glass substrate is 50 mm / s.
After coating a coating film with a film thickness of 100 μm, the coating solution was removed and the removal effect was examined.

The effect of removing the coating liquid was evaluated as ⊚ when the removal test was performed 5 times under each condition, and it could be completely removed by one removal without any residual coating liquid. The case where the removal work was required once was rated as ◯. Further, when the number of times that the removal work was required again was 2 times or more and 4 times or less, it was set as Δ, and when the removal work was performed again 5 times, it was set as x.

From Table 1, for all the relative moving speeds of the die heads, the speed at which the sheet-shaped wiper 10 is fed by the rotation of the roll 11 (hereinafter referred to as the sheet feeding speed) is
A good coating liquid removing effect was obtained at a speed of 1/2 or more of the relative moving speed of the die head. In order to obtain a particularly good effect of removing the coating liquid, it is desirable that the sheet feeding speed be equal to or higher than the relative movement speed of the die head. However, the sheet-shaped wiper 10 is controlled by setting the sheet feeding speed to a speed that is ½ or more of the relative moving speed of the die head and less than the relative moving speed of the die head.
It is possible to suppress the amount used of, and to reduce the cost. It should be noted that the composition ratio, viscosity characteristics, coating conditions, etc. of the coating material in this embodiment are merely examples, and the present invention is not limited to these.

Next, an example of the effect of removing the coating liquid in the case of the fourth embodiment will be described. Table 2 shows a method using the conventional three-sided contact type blade 29 and a method using the cleaning liquid-free Embodiment 2 (indicated as "wiper (dry)" in the table).
The comparison of the removal effect when the coating liquids having different viscosities are removed by the three methods of Embodiment 4 using the cleaning liquid (indicated as "Wiper (dry + liquid)" in the table) is described.

[0083]

[Table 2] The removal effect was evaluated as ◎ when the removal test was performed 5 times with the coating liquid of each viscosity and the removal of the coating liquid was completely eliminated by performing the removal work once for all 5 times, and the coating liquid remained. When the removal work was required once, it was rated as ◯. Also, the number of times that the removal work is required is 2 or more.
The case of less than or equal to the number of times was marked with Δ, and the case of requiring the removal work again 5 times was marked with x.

In the "wiper (dry)", the relative moving speed of the die head was 25 mm / s and the sheet feeding speed was 12.5 mm / s. In addition, "wiper (dry +
Liquid) ”, the relative moving speed of the die head was 10 mm / s, and the sheet feeding speed was 12.5 mm / s.

As shown in Table 2, as compared with the case of using the conventional three-sided contact type blade 29 or the case of "wiper (dry)" at each viscosity, "wiper (dry +
It was found that the effect of removing the coating solution was higher in the case of the (solution). It was also found that this tendency becomes remarkable especially when the viscosity is high.

Next, an example in the case of the fifth embodiment will be described. Using the device according to the fifth embodiment of the present invention, P
The dielectric coating liquid was applied onto the glass substrate for DP. The material composition ratio of the dielectric coating liquid is 60 wt% of solid content including glass particles.
%, Resin component 5 wt%, solvent component 35 wt%, and static viscosity 70 pa · s was used. A glass substrate was coated at a coating speed of 50 mm / s with a film thickness of 100 μm. A glass substrate having a size of 42 "was used, and the number of fiber foreign matters contained in the film was measured when 50 sheets were coated. At this time, the removal operation of the coating liquid on the coating film forming surface 41 was performed.
It was performed after coating each glass substrate. The results are shown in Table 3.

[0087]

[Table 3] In the case of the conventional three-sided contact type blade 29, 16 fibrous foreign substances were found in the coating on 50 glass substrates. Further, in the case of the second embodiment in which the roll 11 does not contain the conductive material, three fibrous foreign matters were found in the coating on 50 glass substrates. According to the coating liquid removing apparatus according to the fifth embodiment, no fibrous foreign matter was found.

Similarly, the number of occurrences of film defects due to uneven streaks when continuously coating 1000 glass substrates was also verified. In the conventional method for removing the coating liquid using the three-sided contact type blade 29, the film has uneven streaks three times. On the other hand, it has been found that the coating liquid removing apparatus according to the second and fifth embodiments can form a uniform coating film of the dielectric layer 3 stably for a long time without causing uneven streaks.

As described above, it is found that the coating liquid removing apparatus and method according to the present invention can significantly improve the yield in the production of the plasma display panel, improve the productivity with high accuracy, and reduce the defective rate. From this, it was found that it would lead to a significant cost reduction.

In the above description, an example relating to the formation of the dielectric layer 3 on the front substrate of the plasma display panel has been described, but the formation of the back plate dielectric or the rib 8 or the electrodes (4, 5, 7) has been described. In the case, the same effect can be obtained.

In the above description, the retracting mechanism of the present invention has been described as the winding roller in the first to fifth embodiments, but the sheet-shaped wiper 1 is made of an elastic material such as rubber.
The sheet wiper 10 may have a structure in which one end of 0 is fixed and the elastic force of the rubber pulls in the sheet wiper 10 by applying a constant tension to the sheet wiper 10 pulled out from between the roll 11 and the coating film forming surface 41. If it is possible, the same effect as above can be obtained by any mechanism.

Roll 1 which is the contact roll of the present invention
1 has been described as being driven by the roll rotation motor 15 in the first to fifth embodiments, but the roll 11 is not driven and only the take-up roller has a drive source such as a motor. Sheet wiper 10
May be drawn in. In that case, roll 1
1 and the roll rotation shaft 16 are not fixed, and the roll 11 has a structure in which the roll 11 can freely rotate with respect to the roll rotation shaft 16, and the same effect as described above can be obtained.

Furthermore, the sheet-shaped wiper 10 of the present invention is
In Embodiments 1 to 5, the ultrafine fibers and the non-woven fabric are described as being desirable, but the present invention is not limited to these, and may be paper, porous foam or other material, and the coating liquid having high viscosity may be used. Any material may be used as long as it has the effect of absorbing, adsorbing, and removing.

In the above description of the first to fifth embodiments, the rotation direction of the roll 11 is described as counterclockwise in FIG. 2, but this direction may be clockwise.
In that case, the coating liquid is removed by the coating film forming surface 41 shown in FIG.
The ball screw rotating motor 14 may be rotated so that the left end of the coating liquid removal start position and the right end of the coating film forming surface 41 are the coating liquid removal end position.

The rotation direction of the roll 11 is counterclockwise, and the coating liquid removal start position is the left end of the coating film forming surface 41.
Set the coating liquid end position to the right end of the coating film forming surface 41,
The ball screw rotating motor 14 may be rotated. Alternatively, the rotation direction of the roll 11 is clockwise, and the ball screw rotating motor 14 is set so that the coating liquid removal start position is the right end of the coating film forming surface 41 and the coating liquid end position is the left end of the coating film forming surface 41. , May be rotated. That is, the direction in which the sheet-shaped wiper 10 on the coating film forming surface 41 is sent out,
The direction in which the die head 17 moves with respect to the roll rotation shaft 16 may be opposite.

Although the roll 11 and the roll rotating shaft 16 are fixed by the key groove, they may be adhered to each other, or the roll rotating shaft 16 is threaded so that the roll 11 is The nuts may be tightened from both ends.

Further, the coating film forming surface longitudinal direction drive mechanism 12 in Embodiments 1 to 5 does not have to use the ball screw as described above. For example, even if the belt is suspended between two pulleys, one of the pulleys is driven by a drive source such as a motor, and the roll support is fixed to the belt, the same effect as above can be obtained. That is, any method may be used as long as it can precisely control the speed, and the driving mechanism is not limited thereto.

In the description of the first to fifth embodiments, the first contact between the sheet-shaped wiper 10 and the coating film forming surface 41 of the die head 17 is performed by the elevating mechanism.
7 was taken down and brought into close contact, but the roll rotary shaft 16,
Roller support 19 or coating film forming surface longitudinal direction drive mechanism 1
An elevating mechanism may be attached to the roller 2, and the roll 11 may be lifted from below the coating film forming surface 41 via the sheet-shaped wiper 10 and brought into contact therewith. Alternatively, both the die head 17 and the roll 11 are provided with a lifting mechanism,
By operating both of these, the sheet-shaped wiper 1
Even with a mechanism in which 0 and the coating film forming surface 41 are in contact with each other, the same effect as described above can be obtained.

In order to form the dielectric 3, ribs 8 or electrodes (4,5, 7) of the plasma display panel on the front substrate 1 or the rear substrate 2, the coating liquids of the first to fifth embodiments are removed. It is sufficient to form a coating film with the coating liquid by repeatedly applying a desired area and then stopping the coating liquid to remove the coating liquid from the die head 17 using an apparatus or a coating liquid removing method.

Further, the dielectric 3, the rib 8 or the electrode (4,
In order to manufacture a plasma display panel in which 5, 7) are formed on the front substrate 1 or the rear substrate 2, the coating liquid removing device or the coating liquid removing method according to the first to fifth embodiments is used. After coating the area, the coating is stopped and the coating liquid of the die head 17 is removed, so that a coating film of the coating liquid may be formed.

[0101]

According to the coating liquid removing apparatus and the coating liquid removing method of the present invention, the removal rate of the coating liquid from the coating film forming surface of the die head is high, the coating liquid is not accumulated, and the coating film is formed. It is possible to provide a coating liquid removing apparatus and a coating liquid removing method that do not require fine adjustment such as alignment with respect to a surface.

When the direction in which the sheet material is sent out and the relative movement direction of the die head with respect to the contact roll coincide, the removal rate of the coating liquid from the coating film forming surface of the die head can be further increased.

When the sheet-like material or the contact roll has elasticity, the coating solution does not accumulate on the side surface of the die head, and there is no need for fine adjustment of the coating film forming surface. Further, it is possible to provide a coating liquid removing apparatus and a coating liquid removing method which do not require a cleaning tool to be manufactured for each die head having a different lip shape.

When the contact roll support has a shock absorber, damage to the die discharge port and the lip can be prevented and abrasion of the coating film forming surface and the like can be suppressed.

When the sheet-shaped wiper or roll contains a conductive material, it is possible to provide a coating solution removing apparatus and a coating solution removing method which prevent foreign matter from adhering to the coating film.

When the cleaning liquid discharge nozzle is provided, it is possible to provide a coating liquid removing apparatus and a coating liquid removing method which have a high removal rate of the coating liquid from the coating film forming surface of the die head.

According to the coating apparatus and the coating method of the present invention, it is possible to form the dielectric, rib or electrode of the plasma display panel with a low defect rate and improved productivity.

According to the plasma display panel manufacturing apparatus and manufacturing method of the present invention, the plasma display panel can be manufactured with a low defect rate and improved productivity.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure of a conventional plasma display panel.

FIG. 2 is an elevation cross-sectional view of the coating liquid removing apparatus according to the first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of coating liquid removal viewed from the direction A of FIG.

FIG. 4 is an elevational sectional view showing a configuration of a conventional coating liquid removing apparatus.

5 is an elevation cross-sectional view of the conventional coating liquid removing apparatus as viewed from the direction B in FIG.

FIG. 3 is a vertical cross-sectional view of a coating liquid removing apparatus using a conventional three-sided contact type blade.

FIG. 7 is an elevational sectional view of a coating liquid removing apparatus using a conventional three-face contact type blade viewed from the direction C in FIG.

FIG. 8 is an elevational view of a conventional three-contact blade.

9 is an elevational sectional view of a coating liquid removing apparatus using a conventional three-sided contact blade viewed from the direction C in FIG.

FIG. 10 is an elevational sectional view showing a part of a coating liquid removing apparatus according to a second embodiment of the present invention.

FIG. 11 is an elevational sectional view showing a coating liquid removing apparatus according to a third embodiment of the present invention.

FIG. 12 is an elevational view showing the configuration of a coating liquid removing apparatus according to a fourth embodiment of the present invention.

[Explanation of symbols]

1 Front substrate 2 Back substrate 3 Dielectric layer 4 scanning electrodes 5 sustaining electrodes 6 protective layer 7 Address electrode 8 ribs 9 Fluorescent layer 10 Sheet wiper 11 rolls 12 Longitudinal drive mechanism for coating surface 13 Ball screw 14 Ball screw rotation motor 15 Roll rotation motor 16 roll rotation axis 17 die head 18 lips 19 roll support 20 Coating liquid for coating surface 21 Coating liquid after removal 22,22 'spring 23 blade 24 suction nozzle 25 Cleaning liquid supply nozzle 26 Coating liquid reservoir 27 Lip side coating liquid 29 Three-sided contact type blade 30 Contact surface coating liquid 31 Cleaning liquid discharge nozzle 32 cleaning liquid 33 Cleaning liquid containing part 34 Drying department 40 die discharge port 41 Coating surface 42 Ball screw engaging part 43 beds 44 Coating liquid removal start position 45 End position of coating liquid removal 50 recesses 51 bearing 52 Bearing support

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01J 9/02 H01J 9/02 F 11/02 11/02 BF term (reference) 4D075 AA01 AC02 AC52 AC84 AC88 BB65Z DA06 DB13 DC24 EA05 4F041 AA01 AA05 AB01 CA02 CA28 4F042 AA01 AA10 CC03 CC04 CC08 DH08 5C027 AA06 AA09 5C040 FA01 GB03 GB14 GD09 GF19 JA02 JA23 MA26

Claims (11)

[Claims] 1. A coating liquid removing device for removing a coating liquid from a coating film forming surface of a die head, comprising: a sheet-like material, a feeding mechanism for feeding out the sheet-like material, and drawing in the sheet-like material. And a contact roll for contacting the sheet-like material, the contact roll having a rotation axis substantially orthogonal to the longitudinal direction of the coating film forming surface, centering the rotation axis It is rotatable as, and abutting from the back surface of the sheet-like material to bring the surface of the sheet-like material into contact with the coating film forming surface, and between the contact roll and the coating film forming surface. A coating liquid removing apparatus in which a sheet-like material is sent out and the rotation axis moves relative to the die head in a state of being substantially orthogonal to the longitudinal direction of the coating film forming surface. 2. A direction in which the sheet-like material is sent out,
The coating liquid removing apparatus according to claim 1, wherein a direction in which the rotating shaft moves relative to the die head coincides. 3. The coating liquid removing apparatus according to claim 1, wherein the sheet-shaped material or the contact roll comprises a material having elasticity. 4. The coating liquid removal according to claim 1, further comprising a contact roll support for supporting the contact roll, wherein the contact roll support includes a cushioning device. apparatus. 5. The conductive material is contained in the sheet-shaped material or the contact roll, according to claim 1.
Item 5. The coating liquid removing device according to item. 6. The coating liquid removing apparatus according to claim 1, further comprising a cleaning liquid discharge nozzle that causes the sheet material to contain a cleaning liquid. 7. A method for removing a coating solution from a coating film forming surface of a die head, comprising a contact roll having a rotating shaft on the back surface of a sheet-like material sent by a sending mechanism and drawn by a drawing mechanism. , The rotating shaft is contacted in a direction substantially orthogonal to the coating film forming surface of the die head, thereby contacting the surface of the sheet-like material with the coating film forming surface, the pulling mechanism or the rotating shaft. By driving, the sheet-like material is sent out between the contact roll and the coating film forming surface, and at the same time, the rotation axis is in a state of being substantially orthogonal to the longitudinal direction of the coating film forming surface, A method for removing a coating liquid, which is moved relative to the die head. 8. A dielectric of a plasma display panel,
A coating apparatus for forming ribs or electrodes on a substrate using a die head, comprising the coating liquid removing apparatus according to claim 1. 9. A dielectric of a plasma display panel,
A coating method for forming ribs or electrodes on a substrate using a die head, the coating method comprising the coating liquid removing step according to claim 7. 10. A method for manufacturing a plasma display panel, comprising forming a dielectric, ribs or electrodes on a substrate by a die coating method, wherein the dielectric, the ribs or the electrodes are formed by the method according to claim 9. Forming method of manufacturing plasma display panel. 11. A plasma display panel manufacturing apparatus for forming a dielectric, a rib or an electrode on a substrate by a die coating method, comprising the coating apparatus according to claim 8. .