JP3793677B2 - Low melting point glass separation and recovery method and apparatus, and low melting point glass paste recycling method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention, upon cutting of the low-melting glass, separation and recovery method and apparatus can that low melting point glass be recycled cutting by low-melting glass, and relates to a method of recycling a low melting point glass paste, more particularly, Plasma that can recycle low-melting-point glass that has been cut and discarded when patterning the partition material made of low-melting-point glass, which is used to form partition walls and electrodes for displays such as plasma display panels, with sandblasting Separation / recovery method and apparatus for low melting point glass such as display panel, etc., partitioning made of low melting point glass by sandblasting using magnetic powder as abrasive after patterning with resist on coated and dried low melting point glass paste processing method for forming a pattern of barrier ribs by cutting the wood The Oite discharged dust and magnetic separator separates the crushed abrasive and cutting the septum material serving low-melting-point glass, to produce low-melting glass paste again separated partition wall member serving low melting point glass as a raw material The present invention relates to a method for recycling a low-melting-point glass paste as a partition wall material after the partition wall is formed by sandblasting of a low-melting-point glass such as a plasma display panel.
[Prior art]
Conventionally, as a patterning method for a partition material made of low-melting glass used for forming a partition of a plasma display panel, etc., a partition material made of low-melting glass after applying and drying a low-melting glass paste on a glass substrate by screen printing or a coater A pattern is formed with a photosensitive resist for sand blasting on the top, and after removing parts other than the resist using a sand blasting apparatus using inorganic powders such as calcium carbonate, glass beads, and alumina as abrasives, the resist is peeled off. The low-melting glass was baked to form the partition walls.
[Problems to be solved by the invention]
In the processing method of forming a partition wall in sandblasting, low-melting glass per one nozzle sandblasting as cutting material and calcium carbonate is coated on the entire surface of the glass substrate, 200 g / 1 m ^{2 /} but 1h is cut, about 3~5μm The low melting point glass scraped off is discarded. Therefore, at present, expensive low melting point glass paste is discarded.
[0002]
In the formation of the partition walls as the high-definition ribs of the plasma display panel, approximately 75% of the applied low melting point glass is discarded, and 25% is used as the plasma display panel.
[0003]
The partition material made of low-melting glass cannot be easily disposed of because it contains harmful lead glass. However, since bismuth is a rare metal and expensive, the material cost will rise.
Therefore, it has been desired to recycle the low melting point glass contained in the discarded dust.
[0004]
However, the low melting point glass cut using a conventional cutting material such as calcium carbonate, glass beads, alumina, etc. is an abrasive that is crushed during cutting, for example, calcium carbonate, per hour per nozzle. It is crushed to about 300g / 1h and about 3-5μm, but this crushed cutting material is mixed with the cut low-melting glass, so that the low-melting glass is separated from the crushed abrasive of about 60wt%. It was difficult.
[0005]
Therefore, it has been required to develop a processing method, an apparatus and a low melting point glass recycling method that can easily separate and recover the abrasive and the low melting point glass.
[Means for Solving the Problems]
In order to solve the above problems, in the method for separating and collecting low melting point glass according to the present invention, in the formation of partition walls by sand blasting of low melting point glass using a magnetic abrasive, it is cut with the abrasive used for sand blasting. In addition to separating the abrasive that can be used for processing from the mixture with the partition wall material made of low melting point glass by a cyclone,
From the mixture after separating the abrasive that can be used for the processing, the crushed abrasive and the low-melting glass as the cut partition wall material are separated using a magnet, and the separated crushed abrasive And low melting glass as a partition material are individually collected.
[0006]
Further, as the separation and recovery device of a low melting point glass of the present invention, a low melting point in the partition wall formed by sandblasting preparative low melting glass using abrasives having magnetism, was cut with the abrasive material used in the sandblasting from a mixture of a partition member made of glass, a classifier consisting of cyclones for separating the abrasive that can be used for processing, from the mixture discharged from the classifier, low serving barrier rib material is cut and crushed Ken Migakuzai a magnetic separator for separating with magnets melting point glass, separated by a pre-Symbol magnetic separator, a dust collector for collecting separately via conduits respectively crushed abrasive and the partition member serving low-melting glass Each is provided .
[0007]
Moreover, the separation and recovery device of a low-melting glass, the conduit between the dust collector and the classifier, the notch of the inner periphery of at least a portion e.g. 2 minutes 1 yen magnet, for example, 2 minutes 1 yen in the drum and fixedly provided in close proximity to the arc, the drum was placed the magnetic separator which is disposed rotatably relative to the magnet, is cut with the abrasive being crushed by the flow of air by negative pressure of the dust collector The mixed powder of low melting point glass as the partition wall material is passed through the outer periphery of the drum, and the crushed magnetic abrasive is adhered to the portion near the magnet of the drum. only collected in one dust collector through the one conduit, capturing the fractured abrasive by rotating the drum with a magnetic by another dust collector at a portion away from the magnet through the other conduit to another dust collector By polishing, polishing with crushed magnetism And separating and recovering machined septum material serving low-melting glass and.
[0008]
The low melting glass as the partition material collected and collected is supplemented with a composition of low melting glass paste such as resin binder made of acrylic or cellulose, organic solvent, colorant, ceramic, low melting glass, etc. to produce a low melting glass paste. And recycling.
[0009]
Low melting point glass paste is generally made by mixing low melting point glass such as lead glass, ceramic powder such as alumina, pigment such as titanium oxide and cellulose or acrylic resin binder dissolved in organic solvent. After the coating, it is dried and the organic solvent is volatilized to form a partition wall material layer made of low-melting glass. After patterning with a dry film, the partition wall material layer is shaved with sandblast.
[0010]
This partition material does not contain any magnetic material, so magnetic powder was used as the abrasive, and it was cut with the crushed abrasive that was conventionally disposed of as dust after processing. Low-melting-point glass paste composition material that is lacking in low-melting-point glass, which is a partition wall material that has been separated and cut using a magnet, only from the crushed abrasive material from the mixture with the low-melting-point glass that is the partition wall material By replenishing, the low melting point glass paste can be manufactured and the partition wall material can be recycled.
DETAILED DESCRIPTION OF THE INVENTION
Austenitic stainless steel such as SUS201, preferably martensitic stainless steel that is magnetic at room temperature, more preferably low-C ferritic stainless steel such as 0.1 to 0.4C, SUS, nickel, iron, cobalt, ferrite, etc. A partition of a plasma display panel is formed by cutting the low-melting glass before baking by sandblasting using the powder as a polishing material.
[0011]
In step 1, the low-melting glass paste 12 is first applied to the substrate by a coater 18 such as screen printing or a roll coater.
[0012]
After drying the low melting point glass paste, in step 2, a pattern is formed with a sandblast resist on the 13 partition walls made of low melting point glass. As a patterning method on the partition wall material 13 layer, a method using the photosensitive dry film 14 as a mask, a method using a photosensitive low melting glass paste as a mask, a method using a liquid photosensitive resin, and screen printing There is a method for printing a masking ink. When a photosensitive resist is used, development is performed with the developer 32 in step 3. In step 4, a pattern of the partition walls 15 is formed by cutting low-melting glass, which is a partition wall material other than the resist, with a magnetic abrasive.
[0013]
In step 5, the resist is stripped using a stripping solution, and in step 6, the partition wall material made of low-melting glass is baked to form the partition wall 15.
[0014]
FIG. 2 shows a sandblasting apparatus for forming partition walls of a plasma display panel.
[0015]
The abrasive is sprayed from the nozzle 7 in the sandblasting device processing chamber 1 through the abrasive hose 21 from the abrasive constant supply device 24. The nozzle reciprocates back and forth at a high speed, and the glass substrate 16 is slowly fed from the left to the right on the driving roller 27 for processing.
[0016]
Abrasive material 41 and the partition wall material serving low melting point glass 42 which is cut is pulled into the negative pressure of the dust collecting unit enters the processing chamber hopper 20 to the conduit 50, to remove large foreign matters mixed in the separation tank 22 the conduit 51 Pass through and enter Classifier 2. Abrasive material that can be used in the classifier 2, an abrasive material 41 that is crushed and cannot be used, and a low-melting glass 42 that is a cut partition wall material, and only the usable abrasive material enters the abrasive material tank 23 and is again supplied with a constant amount of abrasive material. Enter 24.
[0017]
The mixed powder 40 of the crushed magnetic abrasive 41 and the cut low-melting-point glass 42 as the partition wall material is pulled by the negative pressure of the dust collector and discharged from the classifier, and is discharged from the conduit 52 through the conduit 52 as the abrasive 41 and the partition wall material. The separator 5 for the melting point glass 42 is entered.
[0018]
FIG. 3 shows a separator 5 for a low-melting glass as an abrasive and a partition material.
[0019]
The crushed magnetic abrasive 41 and the low-melting glass 42 which has been cut into the separator 5 enter the separation drum 45 and flow along the separation drum 45. A magnet 46 is fixed to the inside of the drum in the portion where the crushed magnetic abrasive 41 and the low melting point glass 42 which is the cut partition wall flow, and only the crushed magnetic abrasive 41 has a magnet on the outer periphery of the drum. Adheres to the arc part that is fixed. Since the abrasive 41 having magnetism crushed by the magnet adheres to the drum, only the low melting point glass 42 which is the partition wall material cut is drawn into the negative pressure of the dust collector 3 and collected by the dust collector 3 through the conduit 53.
[0020]
The abrasive 42 is a drum 45 having a magnetic crushing deposited are collected through a conduit 54 to a dust collector 4 is pulling by the negative pressure of the dust collector 4 reaches the portion magnet is not in the inner periphery of the rotating drum to the drum .
[0021]
By blowing air 43 from outside air to a part where there is no magnet on the inner periphery and blowing it away, or blowing off the crushed magnetic abrasive 41 adhering to the roller, or physically removing it by hitting a peeling bar against the drum It is desirable to send the crushed magnetic abrasive material adhering to the drum to the dust collector 4 forcibly.
[0022]
The magnet may be a permanent magnet or an electromagnet.
[0023]
The low melting glass 42 which is the cut partition material collected by the dust collector 3 is taken out and replenished with a composition of low melting glass paste such as resin binder made of acrylic or cellulose, organic solvent, colorant, ceramic, low melting glass, etc. Then, the low melting point glass paste having the original composition is produced again.
Example 1
A low melting point glass paste is solid-printed on a glass substrate using a stainless 200 mesh screen plate. A partition material layer having a film thickness of 180 μm was formed by printing 8 times and drying. Next, a sandblasting dry film is laminated on a low-melting glass, and a glass mask is placed thereon and exposed to ultraviolet rays so that only a portion that becomes a partition wall is exposed.
[0024]
An unexposed portion is washed out with a developer composed of 0.3% sodium carbonate, and a pattern is formed by a dry film having a pattern width of 50 μm at a pitch of 150 μm.
[0025]
Using the apparatus of FIG. 2, processing is performed by spraying stainless steel having an average particle diameter of 15 μm from the nozzle as an abrasive. As stainless steel, SUS430 having magnetism at room temperature was used.
[0026]
In FIG. 2, the glass substrate moves slowly from left to right, and the nozzle moves back and forth at high speed, and processing is performed by injecting abrasive from the nozzle. The injected abrasive enters the classifier and enters the abrasive constant supply device and is again injected from the nozzle.
[0027]
After processing the low melting point glass by sandblasting, the substrate is placed in a 0.2% sodium hydroxide solution and the dry film is peeled off.
Used dry film: BF-603 (manufactured by Tokyo Ohka Kogyo Co., Ltd.)
Low melting point glass paste: G3-2141 (Okuno Pharmaceutical)
Sandblasting device: SC-5ADNH-404P (Fuji Seisakusho)
After processing 50 pieces of 42-inch substrates, the low-melting-point glass 42 that was cut into the dust collector 3 and the crushed abrasive 41 that had entered the dust collector 4 were taken out.
[0028]
About 600 g of stainless steel powder was separated from about 5 kg of low melting glass, and the stainless steel powder was discarded. The classified low melting glass 42 was recycled by mixing about 30% of the total low melting glass paste used for the low melting glass paste, adjusting the viscosity with an organic solvent (terpineol).
[0029]
When the recycled low melting point glass paste was analyzed, stainless steel was not detected and the abrasive was completely separated.
[Brief description of the drawings]
FIG. 1 is a process diagram for forming a partition for a plasma display panel. FIG. 2 is a sandblasting apparatus. FIG. 3 is a detailed view of a separator for a low melting point glass as an abrasive and a partition material.
DESCRIPTION OF SYMBOLS 1 Sand blasting apparatus processing chamber 2 Classifier 3 Dust collector 4 Dust collector 5 Separator (of abrasive and low melting glass as a partition material) 7 Sandblast nozzle 8 Glass mask 12 Low melting glass paste 13 Partition material layer 14 made of low melting glass Sandblast type photosensitive dry film 15 Plasma display panel partition 16 Glass substrate 18 Coater 20 Hopper 21 Abrasive material hose 22 Separation tank 23 Abrasive material tank 24 Abrasive material constant supply device 26 Nozzle drive unit 27 Drive roller 30 Abrasive material and high pressure air Mixed fluid 32 Developer 40 Mixed powder of crushed abrasive and cut partition material 41 Crushed abrasive 42 Cut partition material 43 Air 45 Separator drum 46 Magnet 47 Separator drum motor 50 Conduit 51 Conduit 52 Conduit 53 Conduit 54 Conduit

Claims (4)

In forming a partition wall by sandblasting low melting point glass using a magnetic abrasive material, a polishing material that can be used for processing from a mixture of the abrasive material used for the sandblasting and a partition material made of cut low melting point glass is a cyclone. Separated by
From the mixture after separating the abrasive that can be used for the processing, the crushed abrasive and the low-melting glass as the cut partition wall material are separated using a magnet, and the separated crushed abrasive And a method for separating and recovering low-melting-point glass, wherein the low-melting-point glass that is a partition wall material is individually collected. In the partition wall formation by sandblasting preparative low melting glass using abrasives having a magnetic, from a mixture of a partition member made of low melting glass wherein is cut with the abrasive used in the sandblasting, polishing can be used for machining A classifier consisting of a cyclone to separate the materials ,
From the mixture discharged from the classifier, and magnetic separator for separating using magnets with crushed Ken Migakuzai the machined septum material serving low-melting glass,
The magnetic separator was separated by instrument, crushed abrasive and the partition member serving low melting point glass, respectively separating and recovering device of the low-melting glass, characterized in that respectively a dust collector for collecting separately. A conduit between the classifier and the dust collector, and fixed magnet to at least a portion of the inside of the drum, the arranged magnetic separator which is disposed rotatably a magnet in the drum, the negative of the precipitator The mixed powder of abrasive material crushed by the flow of air by pressure and low melting point glass that is cut partition wall material is passed through the outer periphery of the drum, and the crushed magnetic abrasive material is attached to the part near the magnet of the drum The low melting point glass powder, which is the cut partition material, was collected in one dust collector through one conduit, and the drum was rotated and the magnet was crushed by another dust collector at a portion away from the magnet. by collecting abrasive to other dust collector through other conduits, according to claim 2, characterized in that to separate and recover a low melting point glass serving barrier rib material which is cut with an abrasive having a fractured magnetic separation and recovery instrumentation of the low melting point glass described . The low melting glass as the partition material collected and collected is supplemented with a composition of low melting glass paste such as resin binder made of acrylic or cellulose, organic solvent, colorant, ceramic, low melting glass, etc. to produce a low melting glass paste. recycling method of the low-melting glass paste in separation and recovery method of the low-melting-point glass according to claim 1, characterized in that.

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