JP2002050295A - Recycling method and equipment of plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recycling method of plasma display panels, which is capable of improving production yield of the panels. SOLUTION: Procedures of the recycling method are follows; glass panels produced in process from step S1a, S1b-step S5 are inspected at step S6, and rejected glass panels taken out at step S7 are separated to a respective front and back substances at step S8, then the other side of the defect substance, as it is acceptable, is returned to a production line and sealed with another substance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for recycling a plasma display panel.

[0002]

2. Description of the Related Art In recent years, as display devices have become larger and thinner, plasma display panels (hereinafter referred to as "P
DP) is under development.

In a PDP device, a front substrate in which a pixel electrode is formed on a glass substrate and a rear substrate in which a pixel electrode is formed on a glass substrate and a phosphor is applied are sealed with a sealing material. It incorporates a PDP in which a discharge gas is sealed between substrates, and its detailed configuration is described in, for example, Japanese Patent No. 2503072, Japanese Patent Application Laid-Open No. 4-366526,
It is disclosed in JP-A-55-70873.

[0004]

Defective electric appliances generated in the manufacturing process are generally disposed of by landfilling, but not only accelerates the shortage of landfills but also causes the above PDP device In this case, since the harmful substance such as lead is contained in the surface layer and the sealing material formed on the front substrate and the back substrate, the harmful substance must be solidified and landfilled. In addition, glass substrates used for the front substrate and the rear substrate are large in size in order to increase the size of the screen, and occupy a large volume and weight in the product. From the point of view, its reuse is desired. Furthermore, PDPs have a complicated structure and a low production yield, and at present, improvements are required.

An object of the present invention is to solve the above-mentioned problems and to provide a plasma display panel recycling method capable of improving the production yield.

[0006]

A method of recycling a plasma display panel according to the present invention is characterized in that one of the non-defective glass panels, which is a non-defective product, is returned to a production line for reuse. .

According to the present invention, an improvement in the yield of PDP production can be expected.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A plasma display recycling apparatus according to claim 1 of the present invention comprises a front substrate having pixel electrodes formed on a glass substrate and a rear substrate having pixel electrodes formed on a glass substrate and coated with a phosphor. A plasma display panel is produced by sealing with a sealing material, filling a discharge gas between the sealed front substrate and the rear substrate, producing a plasma display panel, and inspecting the plasma display panel for a defective plasma display panel. A first separating means for separating the front substrate and the rear substrate from each other, and a returning means for returning a good one of the separated front substrate and the rear substrate to the production line.

According to a second aspect of the present invention, there is provided a method of recycling a plasma display panel, comprising the steps of sealing a front substrate having a pixel electrode formed on a glass substrate and a rear substrate having a pixel electrode formed on the glass substrate and applying a phosphor. A discharge gas is sealed between the sealed front substrate and the back substrate to produce a plasma display panel, the plasma display panel is inspected, and the plasma display panel is determined to be defective in the inspection. Is separated into a front substrate and a rear substrate, and one of the separated front substrate and the rear substrate that is a good product is returned to the production line, and the above-mentioned sealing with the other substrate is performed and reused. And

According to a third aspect of the present invention, there is provided a method of recycling a plasma display panel according to the second aspect, wherein the step of separating the plasma display panel determined to be defective in the inspection into a front substrate and a rear substrate. The non-defective plasma display panel is subjected to a heat treatment at a temperature equal to or higher than the sealing temperature of the sealing material and separated into a front substrate and a rear substrate.

According to a fourth aspect of the present invention, there is provided a method of recycling a plasma display panel according to the second aspect, wherein the step of separating the plasma display panel determined to be defective in the inspection into a front substrate and a rear substrate is performed. A blade is inserted into the sealing material between the front substrate and the rear substrate of the non-defective plasma display panel, and the sealing material is cut along the application region while applying vibration to the blade, so that the front substrate and the rear substrate are cut. And is separated into

According to a fifth aspect of the present invention, there is provided a method of recycling a plasma display panel according to the second aspect, wherein the sealing material is applied along the application area while applying vibration to the blade at a moving distance of 1 mm or less within 100 Hz. It is characterized in that the substrate is separated into a front substrate and a rear substrate.

According to a sixth aspect of the present invention, there is provided a method for recycling a plasma display panel according to the second aspect, wherein the other of the separated front substrate and the rear substrate which is defective is separated from the surface layer by glass. The glass substrate is separated and collected into a substrate and a peeling component, and the separated glass substrate is culletted and reused as a glass raw material.

According to a seventh aspect of the present invention, there is provided a method of recycling a plasma display panel according to the sixth aspect, wherein the grinding wheel is brought into contact with the surface of the separated one of the front substrate and the rear substrate which is defective. The surface layer is peeled off.

In the method for recycling a plasma display panel according to claim 8 of the present invention, a water jet is sprayed on the surface of the other one of the separated front substrate and the rear substrate which is a defective product. The surface layer is peeled off.

According to a ninth aspect of the present invention, there is provided a method for recycling a plasma display panel according to the second aspect, wherein the substrate is separated by the method according to the third or fourth aspect,
The other of the separated front and rear substrates, which is a defective product, has its surface layer peeled off by the method of any one of claims 7 and 8.

Hereinafter, a specific embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an exploded view of a PDP device. 1 is an aluminum chassis, 2 and 3 are hook molded products, 4 is an aluminum insulation molded product, 5 is a model nameplate, 6 is a stand insulating block, 7 to 10 are printed circuit boards, 11 is a SP terminal mounting bracket, and 12 and 16 are shields. Case body, 13 is a back cover, 14 is a spacer, 15
Is a screw, 17 is a shield case lid, 18 is a stand hole cover, 19 is a front cover, 20 is a glass panel (P
DP), 21 is a front plate fixing bracket, 22 to 24 are aluminum bars, 25 and 26 are handles, 27 is a guide spacer, 31
Is a rear terminal display label, and 32 is an SP terminal display label.

The aluminum chassis 1 is attached to the front cover 19, and the glass panel 20 is attached to the aluminum chassis 1. Then, the back cover 13 is attached to the front cover 19 to constitute a PDP device as a product.

The glass panel 20 is shown in FIGS. 2 (a) and 2 (b).
As shown in FIG. 7, a front substrate 33 and a back substrate 34 are sealed with a sealing material 38, and a discharge gas such as neon / xenon is sealed between the sealed front substrate 33 and back substrate 34. I have.

FIG. 3 shows a production line for the glass panel 20. In step S1a, a pixel electrode is formed on a glass substrate to form a front substrate 33, and in step S1b, a pixel electrode is formed on a glass substrate, and a phosphor is applied thereon to form a rear substrate.

In step S2, a sealing material 38 is applied to at least one of the front substrate 33 and the rear substrate 34, and the electrode connection portions formed on the outer peripheral portions project from the opposing substrates as shown in FIG. They are arranged and bonded, and in step S3, they are heated and sealed in a heating furnace.

In step 4, the sealed front substrate 33
After the space between the substrate and the rear substrate 34 is exhausted, a discharge gas such as neon / xenon is sealed. After the aging is performed in step S5, the glass panel 20 is inspected in step S6.

The glass panel 20, which is determined to be non-defective in step S6, is subjected to a post-processing process, and is assembled into a PDP apparatus as shown in FIG. The glass panel 20 determined to be defective in step S6 is collected in step S7, and the first separating means, here, FIG.
Are separated into a front substrate 33 and a rear substrate 34 by the heat treatment means shown in FIG.

Specifically, the front substrate 33 and the rear substrate 34
The electrode connecting portion of one of the substrates, here the rear substrate 34, is supported by the support 39 from the electrode forming surface side. In this state, the glass panel 20 is heated to a temperature equal to or higher than the sealing temperature in step S3, the sealing material 38 is softened, and the front substrate 33 disposed on the lower side is moved by its own weight to the rear substrate 3
4 and fall on the work table 41. At this time, if the urging force is applied in the direction in which the front substrate 33 is separated, the front substrate 33 and the rear substrate 34 can be easily and quickly separated.

This first separating means can be realized by providing a heating furnace dedicated to separation in step S8, but may be the same as the heating furnace used in step S3. However, in this case, since the defective glass panel 20 cannot be heated to a temperature higher than the sealing temperature of the sealing material 38 in step S8, the urging force is applied in the direction to separate the substrates, and the front substrate 33 and the rear substrate 34 Need to be separated.

Of the front substrate 33 and the rear substrate 34 separated in step S8, one of the non-defective substrates is returned to step S2 by automatic, semi-automatic, or manual return means.
The production line is returned to the above-mentioned production line composed of steps S6 to S6, sealing with the other substrate is executed in step S2, and the routine of step S4 and subsequent steps is repeated.

With this configuration, among the defective glass panels 20 selected in step S6, one of the non-defective glass panels 20 can be reused as it is, so that the productivity is improved and the yield is improved. I do.

The other defective substrate among the substrates separated in step S8 is processed in the following procedure. In step S9, the surface layer of the front substrate 33 or the rear substrate 34, which is defective, is peeled off by the second separating means.

As a second separating means, for example, as shown in FIG. 5, a grindstone is brought into contact with the surface of the front substrate 33 or the rear substrate 34, and in the case of the front substrate 33, the pixel electrode or the dielectric layer is peeled off. However, in the case of the rear substrate 34, there is one that peels off the pixel electrode and the phosphor. Here, arrow B as a whetstone
Using a belt-type grinding wheel 36 that rotates in the
Alternatively, while the back substrate 34 is conveyed in the direction of arrow A [substrate conveying direction] by the feed belt 35, the surface is polished by the belt-type grindstone 36 to separate the surface layer.

With this configuration, the front substrate 33,
The surface layer of the back substrate 34 is almost completely peeled off, and the glass substrate can be efficiently recovered with high purity. Step S
The glass substrate from which the surface layer has been peeled off and collected in step 9 is culletized in step S10, and the culletized glass material is sold as an industrial material to another trader in step S11. By selling to specialized companies in this way, it can be reused in other fields.

The removal of the surface layer in step S9 is performed in a closed room 37. In step S12, the air in the room 37 is forcibly sucked, and the cutting powder scattered by the cutting is directly sucked into a bag or the like. Separated and collected. At this time, the cutting powder peeled off the front substrate 33 or the cutting powder peeled off the back substrate 34 is collected in the same bag or the like.
The collected cutting powder includes silver contained in the wiring pattern,
Substances such as lead contained in the ribs formed on the rear substrate 34 and magnesium oxide and barium contained in the phosphor are included. For these substances, those whose content is above a certain level are recovered as metals, and the others are detoxified and landfilled.

As described above, according to this embodiment, the defective glass panel 20 is replaced with the front substrate 33 and the rear substrate 34.
By returning one non-defective substrate to the production line, bonding it to the other substrate as it is, and reusing it, the productivity is improved and the yield is improved.

Further, the other substrate of the defective product can be reused as an industrial raw material by peeling the surface layer of the substrate, and the metal containing harmful substances can be recovered and reused or made harmless and disposed of. An effective recycling method can be realized both in terms of resources and resources.

In the above description, the step of separating the front substrate 33 and the rear substrate 34 in step S8 is performed by the heat treatment shown in FIG. 4, but the step of separating the front substrate 33 and the rear substrate 34 in step S8 is performed. As shown in FIG. 6, a blade 40 is inserted into a sealing material 38 between a front substrate 33 and a rear substrate 34 of the glass panel 20, and while the blade 40 is being vibrated, an application area of the sealing material 38 is applied. , The sealing material 38 can be cut into the front substrate 33 and the rear substrate 34. As for the vibration applied to the blade 40, for example, when the repetition frequency is within 100 Hz and a minute vibration is moved within 1 mm, the two substrates can be separated well.

In the above description, the surface peeling method using a grindstone is used in the surface peeling step of step S9, but the surface of the defective front substrate 33 or back substrate 34 is sprayed by dry or wet blasting. Accordingly, the same effect can be obtained even if the surface layer is peeled off.
The blast is preferably sprayed with a water jet (high-pressure water, ultra-high-pressure water), and the pressure, feeding speed, media, and the like are selected so that the surface layer can be peeled off most efficiently and completely.

That is, as described above, in the step S8, the front substrate 33 and the back substrate 34 are separated by any method of heating or vibration by the blade 40. In the step S9, a grinding wheel or a water jet is used. The surface layer can be peeled off by any of the methods, and these combinations are not particularly limited.

[0037]

As described above, according to the method for recycling a plasma display panel of the present invention, a front substrate in which pixel electrodes are formed on a glass substrate and a rear substrate in which pixel electrodes are formed on a glass substrate and a phosphor is applied are sealed. Seal with the dressing material,
A discharge gas is filled between the sealed front substrate and the back substrate to produce a plasma display panel, the plasma display panel is inspected, and the plasma display panel determined to be defective in the inspection is subjected to the front substrate and the back. The separated front substrate and the separated front substrate are separated from the front substrate and the rear substrate by performing the sealing with the other substrate by returning to the production line one of the non-defective substrates and the separated front substrate. One non-defective substrate among the rear substrates can be reused as it is, and an improvement in production yield can be realized.

[Brief description of the drawings]

FIG. 1 is an exploded view of a PDP device to be processed by the present invention.

FIG. 2 is a plan view and a cross-sectional view illustrating a configuration of the glass panel 20 of FIG.

FIG. 3 is a flowchart showing a manufacturing process and a recycling method of the glass panel 20 of FIG.

FIG. 4 is a perspective view illustrating step S8 in FIG. 3;

FIG. 5 is a schematic diagram illustrating step S9 in FIG. 3;

FIG. 6 is a plan view and a cross-sectional view illustrating step S8 in FIG. 3;

[Explanation of symbols]

 Reference Signs List 20 glass panel 33 front substrate 34 rear substrate 36 belt-type grindstone 38 sealing material 39 support base 40 blade

 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Yukio Maeda 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 5C012 AA09 5C040 JA25 JA31 MA26 5G435 AA17 AA19 BB06 KK05

Claims (9)

[Claims] 1. A front substrate having a pixel electrode formed on a glass substrate and a rear substrate having a pixel electrode formed on the glass substrate and coated with a fluorescent substance are sealed with a sealing material. Producing a plasma display panel by enclosing a discharge gas during the production, a production line for inspecting the plasma display panel, first separating means for separating the defective plasma display panel into a front substrate and a rear substrate, A plasma display panel recycling apparatus provided with a return means for returning a good one of the separated front substrate and rear substrate to the production line. 2. A front substrate having a pixel electrode formed on a glass substrate and a rear substrate having a pixel electrode formed on the glass substrate and coated with a phosphor are sealed with a sealing material. A plasma display panel is manufactured by filling a discharge gas during the inspection, the plasma display panel is inspected, and the plasma display panel determined to be defective in the inspection is separated into a front substrate and a rear substrate. A method of recycling a plasma display panel in which one of non-defective substrates and a back substrate is returned to a production line, sealed with the other substrate, and reused. 3. The step of separating the plasma display panel determined to be defective in the inspection into a front substrate and a rear substrate, wherein the defective plasma display panel is heated to a temperature equal to or higher than the sealing temperature of the sealing material. 3. The method according to claim 2, wherein the plasma display panel is separated into a front substrate and a rear substrate. 4. The step of separating the plasma display panel determined to be defective in the inspection into a front substrate and a rear substrate, wherein the sealing material between the front substrate and the rear substrate of the defective plasma display panel is provided. 3. The method according to claim 2, wherein a cutting tool is inserted into the sealing material, and the sealing material is cut along the application region while applying vibration to the cutting tool to separate the sealing material into a front substrate and a rear substrate. 5. The plasma display according to claim 4, wherein the sealing material is cut along the application region while being vibrated at a moving distance of 1 mm or less within 100 Hz to the blade to separate it into a front substrate and a rear substrate. Panel recycling method. 6. The separated front substrate and the rear substrate which are defective among the rear substrates are separated and recovered into a glass substrate and a separated component by peeling a surface layer thereof, and the separated glass substrate is formed into a cullet. 3. The method for recycling a plasma display panel according to claim 2, wherein the plasma display panel is reused as a glass material. 7. The method for recycling a plasma display panel according to claim 6, wherein the surface layer is peeled off by bringing a grindstone into contact with the surface of the other one of the separated front substrate and the rear substrate which is a defective product. 8. The method for recycling a plasma display panel according to claim 6, wherein a water jet is jetted onto a surface of the separated one of the front substrate and the rear substrate, which is a defective product, to remove the surface layer. 9. The method according to claim 3, wherein the substrate is separated by the method according to any one of claims 3 and 4, and the other of the separated front substrate and the rear substrate, which is a defective product, is provided. 3. The method for recycling a plasma display panel according to claim 2, wherein the surface layer is peeled off by any method.