KR100404892B1 - Method for Manufacturing Barrier for Plasma Display Panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a partition wall for a plasma display panel. The present invention relates to a method for manufacturing a partition wall for a plasma display panel, which is excellent in mass productivity and economical by manufacturing a partition wall by a roll press according to a submersible type. The purpose is to provide.

Accordingly, the present invention provides a method for manufacturing a partition wall for plasma display panel by manufacturing a water barrier type having the opposite shape of the partition wall on a plastic film base material and then pressing the green tape for partition wall or the green tape adhered to the substrate together with the water barrier type. It is.

As a result, direct damage to the mold due to the tearing of the bulkhead material generated by the conventional press or roll press molding method can be avoided, and even a minute shape can be easily formed, thereby making it easier to cope with the high-definition shape used in the HD class. Compared with the existing bulkhead manufacturing process, it is possible to secure mass production, which enables low-cost production.

Description

Method for Manufacturing Barrier for Plasma Display Panel {Method for Manufacturing Barrier for Plasma Display Panel}

`` Technical field to which the invention belongs ''

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a method for manufacturing a partition wall for a plasma display panel.

`` Prior technology ''

Plasma Display Panels (PDPs) are devices that display images by generating light by exciting fluorescent materials or special gases.

That is, in the plasma display panel, a glow discharge occurs by applying a predetermined voltage to the electrode in a state where gas is charged between two electrodes installed in an enclosed space, and a predetermined discharge is generated by ultraviolet rays generated during the glow discharge. It is a display which forms an image by exciting the phosphor layer formed in the pattern of.

In the plasma display panel, barrier ribs forming a discharge space are formed between upper and lower plates, and at least one pair of electrodes forming a kitchen discharge or an auxiliary discharge is formed in the discharge space depending on the type of the plasma display panel. .

In the plasma display panel as described above, the barrier rib is typically formed on an upper surface of the lower plate, and a method of manufacturing the barrier rib is as follows.

The barrier rib manufacturing method uses a screen print method, a sand blast method, a photosensitive paste method, an additive method, and a squeezing method.

When explaining such a manufacturing method as follows.

In the screen printing method, the screen having the same pattern as the pattern of the partition wall is closely adhered to the substrate, the partition material is repeatedly printed, and then dried and fired to form the partition wall.

The sand blasting method is also called dry etching, and a method of forming a partition by cutting a portion not covered with the masking pattern by imparting fine cutting particles into an air stream and colliding it with a barrier material layer in which a masking pattern has been previously formed. to be.

The squeezing method is a method of manufacturing partition walls by heat-compressing a paste into a mold in which the opposite shape of a product is formed, and is disclosed in Japanese Patent Application Laid-open No. Hei 10-214559 and Japanese Patent Application Laid-open No. Hei 10-208628. The patent application discloses a method of compressing a partition wall to form a partition wall, and a method of filling a partition material into a mold and thermosetting and molding the partition wall material.

In addition, Japanese Patent Laid-Open Publication Nos. Hei 1-37534 and Japanese Laid-Open Patent Publication No. 5-334956 are disclosed as a patent for filling partition material into a mold to manufacture partition walls. The former uses a thermoplastic resin as a mold to form a thermoplastic resin mold. It is a method of forming a partition by firing the partition material filled in together, and the latter is filled with the partition material in the molding mold, and the glass substrate used as the back plate is adhered on the filling to separate the mold, and then the partition wall bonded to the glass is fired. That's how.

In addition, the squeegeeing method of compressing and forming a partition material into a mold is described in detail in Korean Patent Publication No. 1997-027537 of LG Electronics, the technical content of which is to form a paste on a substrate and to dry it, or to inorganic materials of ceramic or glass particles. After preparing a ceramic tape mixed with the organic material and matching it on the substrate, the substrate is heated and the paste is pressed to form a partition wall, the mold is separated from the partition-formed substrate, and then the partition-formed substrate is cooled and appropriately fired. It is a method of forming a partition by baking at temperature.

In addition, in the patent of WO 98-49706 of SARNOFF Co., the partition formation method is described by the squeeging method, and here, ceramic tape is used which is formed of a material formed on a substrate. This patent describes a method for producing a green ceramic tape in which the coefficient of thermal expansion of the metal substrate used and the green ceramic tape coincide.

On the other hand, the Japanese Kyocera patent mentioned above also proposed a partition wall forming method using the squeegeeing method.

However, there is a problem in the method of manufacturing the partition wall of the plasma display panel according to the prior art.

First, in the case of the screen printing method, since the thickness of the printing film is limited per one time, it is difficult to obtain the height of the bulkhead to be repeatedly obtained and finally obtained in a short time. In addition, the screen printing method requires precise printing every time in order to form a constant height, low production rate for the raw materials to be used, easy deformation of the bulkhead during printing, and also due to the increase in printing engraving. High precision of the bulkhead cannot be satisfied.

Second, in the case of the sand blasting method, the process is complicated and precise development using a photoresist is required, and defects of partition walls resulting from undeveloped parts are likely to occur. Therefore, a good product production rate is low, and the polishing force is reduced due to the aging of the abrasive, or there is a change in the abrasive over time, so that stable mass production is difficult.

Third, the addition method and the photosensitive paste method are advantageous for the formation of high-definition partition walls, but are not suitable for mass production due to the complicated process and the loss of raw materials.

Fourth, in the case of the press method, the bulkhead is manufactured by a relatively simple method, but the bulkhead height before firing is initially low, so the plastic shrinkage rate should be considered. Uniform pressure is difficult to apply, so the partial pressure is inferior to the uniformity of the bulkhead height. In addition, there is a limit to the molding method for reducing the pitch, which is the distance between the partition walls, and increasing the height of the partition walls. That is, it is disadvantageous in improving a luminous efficiency and manufacturing a back plate used in a high definition plasma display panel in the future.

Fifth, in the method of filling the partition material into the mold, there is a fear of breakage of the partition wall when separating from the mold, so that it is difficult to produce a good product. In order to solve the problem of breakage of the bulkhead, a method of filling a bulkhead material by using a mold of thermoplastic and then firing the same has been attempted. However, the method also has difficulty in manufacturing a mold of thermoplastic and when firing it There is a problem in that the amount of calcined is bad, the firing efficiency is bad, and the carbon residue after firing also in the final product.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and the production of barrier ribs by roll pressing by the sub-type is excellent in mass productivity and economical, and partitions for plasma display panels for manufacturing high-definition barrier ribs. The purpose is to provide a manufacturing method.

1 is a view for explaining a step of manufacturing a water-repellent mold in the method of manufacturing a partition wall according to the present invention.

2 is a view for explaining the step of printing the electrode and the dielectric layer after manufacturing the green tape in the barrier rib manufacturing method according to the present invention.

3 is a view for explaining a step for joining the substrate in the barrier rib manufacturing method according to the present invention.

Figure 4 is a view for explaining the step of removing the water barrier mold in the partition manufacturing method according to the present invention.

5 is a view showing the shape of the final product fired by the partition wall manufacturing method according to the present invention.

<< Explanation of symbols for main part of drawing >>

101 ... curing lamp 102 ... plastic film

103 Resin 104 Molding Roller

105 Water Repellent 106 Bulkhead Slurry

107 ... tape casting device 108 ... carrier film

109, 111, 113 ... drying process 110 ... electrode printing

114 Green Tape 115 Roll Press

116 Curing lamp 117 Release roll

118 ... collection roll 119 ... substrate

120 ... Press 121 ... Lamination

122 Removing the plastic film substrate 123 Black pigment

124 ... print roller

In order to achieve the above objects, the method for manufacturing a partition wall for plasma display panel according to the present invention comprises the steps of: preparing a water-repellent mold having the opposite shape of the partition on a plastic film substrate, coating the partition slurry on a carrier film, and then drying the green tape. Manufacturing, printing an electrode and a dielectric layer on the barrier slurry surface of the dried green tape, forming a barrier rib by pressing the printed green tape and the water repellent mold, and releasing the carrier film of the green tape. The method includes the steps of: adhering a substrate to a surface of the barrier rib on which the carrier film is released, removing the plastic film base and the water repellent mold, and firing the partition wall from which the plastic film base and the water repellent mold are removed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates a step of manufacturing a water-repellent mold having an opposite shape of a partition on a plastic film substrate in a method of manufacturing a partition for a plasma display panel.

The apparatus used in this step is composed of a supporting roller, a forming roller 104 and a curing lamp 101, the supporting roller and the forming roller 104 are disposed in a contiguous manner, and the water-retaining mold 105 is disposed below the forming roller 104. ) Is cured lamp 101 is disposed.

The forming roller 104 is rotated together with the supporting rollers to produce the resin 103 into the water-removal type 105 having the opposite shape of the partition wall. For this purpose, the forming roller 104 corresponds to the shape of the partition wall along the outer circumference of the forming roller 104. Grooves are formed.

In order to form the groove, the forming roller 104 is made of a metal having excellent compressive strength and hardness because the strength should be strong.

For example, after the product shape is processed on a flat metal or plastic material, a partition plate metal plate mold is manufactured by using a nickel pole, and the forming plate 104 is manufactured by winding the metal plate mold on a roller.

Here, the plastic material is preferably a polymethyl methacrylate plate produced by the casting process.

In addition, the surface of the forming roller 104 is preferably coated with a metal having excellent durability and releasability or an organic material having hydrophobicity on the surface.

More preferably, the metal is chromium, and the organic material is preferably ceramic or Teflon.

In addition, the thickness of the coating layer during the coating is preferably 1 to 5㎛.

In addition, the forming roller 104 is preferably at a temperature of 30 to 70 ° C, more preferably 40 ° C, which is a temperature suitable for maintaining mold release property with the mold.

And a heating element for heating the roller is inserted in the inside of the forming roller 104 in order to improve the formability during compression of the forming roller 104.

In the step of manufacturing the water repellent mold 105 by using the apparatus as described above, the plastic film base 102 is brought into close contact with the surface of the support roller to rotate and at the same time the resin 103 between the support roller and the forming roller 104. ). Then, the resin 103 is molded by the forming roller 104, and the water repellent mold 105 is formed on the plastic film base 102.

The plastic film base 102 used in such a water-repellent manufacturing step is preferably a thermoplastic film, more preferably the thermoplastic film is polyethylene terephthalate, polyvinyl alcohol, vinyl chloride resin, polyethylene, polypropylene and poly The main raw material is selected from the group consisting of carbonates.

The thickness of the plastic film base material 102 is preferably 5 to 200 μm, more preferably 10 to 25 μm.

When the plastic film base material 102 exceeds 200 μm, there is a problem in that the thickness of the film base material becomes too thick, and when the plastic film base material 102 is less than 5 μm, there is a problem in that it does not have mechanical strength.

It is preferable that the resin 103 used in the step of manufacturing the now-type mold is a resin cured by ultraviolet rays or electromagnetic rays, and the resin 103 is excellent in releasability and excellent in adhesive force to the plastic film base 102. .

On the other hand, the step of manufacturing the water-repellent mold may further include a curing process for curing the molded water-repellent mold 105, for this purpose uses a curing lamp 101 for emitting ultraviolet rays or electromagnetic radiation to the lower portion of the forming roller 104. .

2 shows a step of manufacturing the green tape 114 by the tape casting method and a step of printing the electrode and the dielectric layer.

The tape casting device used in the manufacturing of the green tape is a device for injecting the partition slurry 106 onto the carrier film 108 so that the partition slurry 106 is coated on the upper surface of the carrier film 108.

At this time, the carrier film 108 to be used is preferably a mylar film having excellent releasability with a silicon coating on the surface.

And it is preferable to use the thing of 5-200 micrometers in thickness of the carrier film 108, More preferably, it is good to use the film of 50-150 micrometers.

If the thickness of the carrier film 108 exceeds 200㎛, there is a problem that the thickness of the film substrate is too thick, if less than 5㎛ there is a problem that does not have mechanical strength.

In addition, the barrier slurry 106 coated on the upper surface of the carrier film 108 has a viscosity of 500 to 1500 cps, and is a slurry prepared by mixing a small amount of a solvent and an organic binder including an inorganic material and a dye including ceramic powder and glass frit. Use

In particular, the inorganic material of the partition slurry 106 has a temperature lower than 500 to 600 ° C., which is a transition point (T _g ) temperature of the soda-lime-based glass substrate when the substrate used as the substrate is a soda-lime-based glass substrate. It is preferable to melt at 400-500 degreeC, and when a base material used as a board | substrate is a titanium metal plate, it is preferable to apply to 700 degreeC.

In addition, the organic material of the partition slurry 106 preferably contains 5 to 30% by weight excluding the solvent. When the photocurable organic material is used as the organic binder, the organic material of the partition slurry 106 may have a problem of being broken down when the partition wall is fired.

In particular, the partition slurry 106 may include the black pigment 123, and when the partition slurry 106 includes the black pigment 123, the contrast may be implemented on the screen even though no separate process is performed. There is this.

The partition slurry 106 coated on the carrier film 108 while manufacturing the green tape is cured through the drying process 109 between the manufacturing green tape and the printing step. 114).

The drying step 109 is preferably a convection oven, it is more preferable if the drying temperature of the oven is 60 to 150 ℃.

In particular, the solvent contained in the partition slurry in the drying step 109 is removed.

The thickness of the green tape 114 manufactured through the drying process 109 as described above is preferably 150 to 300 ㎛, more preferably 220 ㎛.

When the thickness of the green tape 114 is 150 μm or less, a barrier rib having a sufficient height cannot be obtained after the barrier rib is fired, and the barrier rib is not formed because the green tape 114 does not have sufficient strength in the step of removing the water repellent mold 105 described later. Tearing may occur.

Subsequently, in the printing step, the electrode 110 is printed 110 on the top surface of the dried green tape 114, and the printing method may be an intermittent screen printing method or a roll screen printing method continuously.

Subsequently, after electrode printing, a dielectric layer is printed 112 on the upper portion of the electrode printed through the drying process 111 to form a dielectric layer, and then re-dried 113 to harden the dielectric layer.

The drying process 111 and the redrying 113 as described above are for removing the solvent removal in the printing material.

Preferably, the drying steps 111 and 113 are performed in a convection drying oven at 60 to 150 ° C., and the material of the electrode to be printed is silver paste, and the dielectric material is glass frit used in the partition slurry. Preference is given to using ethylene cellulose and a solvent.

In FIG. 3, a step of forming a partition, removing a carrier film, and adhering a substrate are illustrated.

In the forming of the partition wall, the partition wall is manufactured by roll-pressing 115 the green tab 114 and the green tab 114 which are manufactured during the manufacturing of the water tap mold to the printing step.

The roll press water repellent mold 105 is located at the bottom, and the green tape 114 is positioned at the top of the water repellent mold 105. In particular, the green tape 114 has a carrier film 108 at the top and an electrode and a dielectric layer at the bottom. Position it so that it is located at

After the roll press hardening is preferably selected to the curing method suitable for the hardening of the partition material, for this purpose after the roll press 115 to install a curing apparatus.

The curing method is to cure by using ultraviolet rays or electromagnetic rays. The ultraviolet rays may be a lamp that emits ultraviolet rays of 400 nm or more in the visible ray region where 365 nm is the main wavelength, or in the case of using electromagnetic rays, a thick bulkhead There is an advantage that the paste, which is a material, can be evenly cured.

Such curing methods may be used in combination.

Removing the carrier film is removing the carrier film 108 from the partitioned green tape 114. If the step of removing the carrier film is a continuous process from manufacturing the green tape to forming the partition wall, removing the carrier film 108 using the release roll 117 and the collection roll 118 is performed. desirable.

After the carrier film 108 is removed, the subsequent bonding step is to release the carrier film 108 and then adhere the substrate 119.

In order to attach the substrate 119 to the upper surface of the green tape 114 after the carrier film 108 is released, a method of thermally fusion bonding the substrate 119 to which the adhesive is applied by the press 120, or the partition wall and the resin. It is preferable to use a method 121 for laminating a mold in a state where the mold is matched between two rollers.

In the case of using the thermal fusion method, the temperature of the heat to be added is preferably 50 to 150 ° C.

In particular, in the case of the lamination method 121, it is preferable that the roller contacting the partition wall among two rollers used for lamination has a Showa hardness of 60 or less.

And the adhesive applied to the substrate is preferably selected from the group consisting of polybutyral, epoxy, polyvinyl alcohol and acrylic.

4 shows the operation of removing the water retaining mold 105 after the substrate 119 is bonded.

In this step, the water-repellent mold 105 and the plastic film base 102 are removed in a state where the bonded substrate 119 is disposed downward in the step of adhering first, and preferably the water-repellent mold 105 is matched. Heat is applied to the removed substrate 119, and the temperature of the applied heat is preferably 50 to 150 ° C.

In addition, the step of removing the water-repellent mold may further include a process of printing the black pigment 123 on the partition wall from which the plastic film substrate 102 has been removed to implement the contrast.

The printing process of the black pigment 123 may be used a method of continuously printing by a gravure printing roller or a method of screen printing intermittently.

The final step of the present invention is the step of firing the partition wall from which the water repellent mold 105 and the plastic film base 102 are removed, and the shape of the fired final product is shown in FIG. 5.

The firing process may be conventional methods used for firing the substrate.

For example, after heating up to 450 ° C. at 3 ° C. per minute at room temperature, the temperature is maintained at 450 ° C. for 30 minutes to 1 hour, and the temperature is further raised from 450 ° C. to 750 ° C. and maintained at 750 ° C. for 40 minutes. The slow cooling method is good.

The firing step of the present invention has the advantage that the energy required for firing by firing the partition wall from which the water barrier die 105 is removed is smaller than that of the prior art.

As described above, the method for manufacturing the partition wall of the plasma display according to the present invention may produce the partition wall by a series of continuous processes using rollers, thereby achieving better mass production and lowering cost than the existing manufacturing method.

In addition, by using the roll pressing method using the suze type and the green tape, direct damage of the mold due to the tearing of the partition material can be avoided, and even the minute shape can be easily formed, so it is easy to manufacture the HD grade partition wall.

Claims (17)

(Correction) In the method of manufacturing the partition wall of the plasma display panel, Manufacturing a water repellent mold having the opposite shape of the partition wall on the plastic film substrate; Coating a barrier slurry on a carrier film and then drying to prepare a green tape; Printing an electrode and a dielectric layer on a surface of the barrier slurry of the dried green tape; Roll pressing the printed green tape and the water repellent mold to form a partition wall; Releasing the carrier film of the green tape; Adhering a substrate to a surface of the barrier rib on which the carrier film is released; Removing the water repellent mold and the plastic film substrate; And Firing the partition wall from which the water-receiving mold and the plastic film substrate are removed; Bulkhead manufacturing method for a plasma display panel comprising a. The method of claim 1, further comprising the step of printing a black pigment on the upper surface of the partition from which the water barrier mold and the plastic film substrate are removed between the step of removing the water barrier mold and firing the partition wall. Method of manufacturing partition walls for display panels. The method of claim 1 or 2, wherein the thickness of the plastic film base material is 5 to 200 mu m. The method of manufacturing a water-repellent mold having the opposite shape of the partition wall, wherein the plastic film base material coated with the resin for the mold is passed between the support roller and the forming roller with the partition wall shape engraved on the surface. Method for manufacturing a partition wall for plasma display panel, characterized in that the manufacturing. The method of claim 4, wherein the forming roller is manufactured by manufacturing a metal plate mold of a product shape using a nickel pole after processing the product into a shape of a product on a flat metal or plastic material, and winding the mold on a roller. A barrier rib manufacturing method for a plasma display panel. 6. The method of claim 5, wherein the plastic material is a polymethyl methacrylate plate. 7. The method of claim 5 or 6, wherein the forming roller has a temperature of 30 to 70 deg. The method of claim 1, wherein the carrier film has a thickness of 5 to 200 µm. The method of claim 1, wherein the barrier slurry has a viscosity of 500 to 1500 cps. 10. The method of claim 1, 8 or 9, wherein the dried green tape has a thickness of 150 to 300 µm. The method of claim 10, wherein the barrier rib slurry is coated and dried at 60 to 150 ° C. 12. The method of claim 1, wherein the electrode printing of the printing step is made of silver paste. The method of claim 1, wherein the material of the dielectric layer in the printing step is made of glass frit, ethylene cellulose, and a solvent. The method according to any one of claims 1, 12 and 13, And a drying process is further included after each of the electrode printing and the dielectric layer printing in the printing step. 15. The method of claim 14, wherein the drying step is performed at a temperature of 60 to 150 [deg.] C. The method according to any one of claims 11 and 15, The drying method for manufacturing a partition wall for a plasma display panel, characterized in that the oven is used to dry by convection. The method of claim 1, wherein the release of the carrier film during the releasing of the mold is performed by using a release roll, and the release carrier film is collected using a collecting roll.