JPWO2020116051A1 - Discharge electrode plate - Google Patents

Abstract

[Purpose] An object of the present invention is to reduce deterioration due to corona discharge and extend the life of a discharge electrode plate that forms an elongated discharge electrode for corona discharge. [Structure] A heat-resistant plate made of a heat-resistant material, and a discharge electrode formed by coating and firing conductive glass in an elongated groove formed on the heat-resistant plate or on the heat-resistant plate. The discharge electrode is made of electronically conductive conductive glass to reduce deterioration due to corona discharge and extend the service life. [Selection diagram] Fig. 2

Description

The present invention relates to a discharge electrode plate that forms an elongated discharge electrode for corona discharge.

Conventionally, there is a method of modifying the surface of a polymer resin to make a slippery surface into a small unevenness or a thorn shape, and one method of passing it through an atmospheric corona discharge.

By passing the polymer resin through the corona discharge, the activated ions in the plasma appropriately make the surface of the resin uneven or jagged.

When the surface of the polymer resin has a small uneven shape, it changes from water-repellent to hydrophilic. For example, as an applied product, it is convenient that the surface of the bamboo blind for drying seaweed has small irregularities. As a result, the seaweed pulled up from the seawater has a certain degree of adhesion, but when the surface of the polymer resin is in a slippery state, this adhesion cannot be obtained and the seaweed does not adhere to the bamboo blinds.

As described above, the surface modification treatment of the polymer resin is carried out by causing a corona discharge in the atmosphere. Conventionally, metals (for example, stainless steel and tungsten) have been used as the material of the discharge electrode.

However, when metals (stainless steel, tungsten) are used as the conventional discharge material for corona discharge, a large amount of ozone O3 is generated under the corona discharge plasma, so that the time is extremely short (faster one is about one week). ), The surface is oxidized, and electrons cannot be smoothly supplied from the surface of the discharge electrode, so that the battery cannot be used.

Further, there is also a problem that the surface of the discharge electrode is oxidized in a short time (about one week) and discharge cannot be performed, so that it is required to replace the discharge electrode.

The present inventors have experimentally discovered that even if conductive glass is used as a discharge electrode material for corona discharge, electrons can be smoothly supplied for a long period of time.

Therefore, according to the present invention, in a discharge electrode plate for forming an elongated discharge electrode for corona discharge, a heat-resistant plate made of a heat-resistant material and an elongated plate formed on the heat-resistant plate or elongated on the heat-resistant plate are formed. A discharge electrode formed by coating and firing conductive glass is provided in the groove, and the discharge electrode is formed of electronically conductive conductive glass to reduce deterioration due to corona discharge and extend the life. ing.

At this time, the conductive glass is vanadate glass composed of vanadium, barium, and iron.

The heat-resistant plate is made of heat-resistant glass.

In addition, the lead wire is connected by soldering to the discharge electrode.

Further, the lead wire is soldered to the discharge electrode by ultrasonic soldering.

Further, when the conductive glass is applied and fired to form a discharge electrode, a paste containing the powder of the conductive glass is generated, and the produced paste is applied and fired to form an electronically conductive discharge electric electrode. I have to.

Further, a high frequency voltage in the range of 10 KHz to 30 KHz is applied between the other electrode facing the discharge electrode or the other electrode on the back surface of the discharge electrode to discharge the corona around the discharge electrode.

FIG. 1 shows a configuration example of the discharge electrode plate of the present invention.

In FIG. 1, the heat-resistant glass plate 1 holds the discharge electrode 3 and is a heat-resistant plate that can withstand the high temperature caused by the corona discharge.

The hole 2 is a hole for fixing the heat-resistant glass plate 1 to a device (not shown).

The discharge electrode 3 is an electrode for corona discharge, and here, it is an elongated electrode formed by coating and firing conductive glass. In the experiment, the width is about 1 mm to 30 mm, the length is 10 cm, and it may be as long as possible.

The soldering 5 is a schematic representation of the lead wire 6 soldered. Here, since the discharge electrode 3 is made of conductive glass, the lead wire 6 is soldered by ultrasonic soldering. Normal soldering without ultrasound is difficult.

The lead wire 6 is soldered to the discharge electrode 3 to apply a high frequency voltage, and supplies a power source for corona discharge around the discharge electrode 3.

Next, the manufacturing process of FIG. 1 will be described in detail according to the order of the flowchart of FIG.

FIG. 2 shows a flow chart of the manufacturing process of the present invention.

In FIG. 2, S1 prepares an ABL glass paste. This prepares ABL glass paste (name of conductive glass paste) which is a conductive paste forming the discharge electrode (conductive glass) 3 of FIG. 1 (see FIG. 4 described later).

S2 is coated with ABL glass paste. For this, the ABL glass paste prepared in S1 is screen-printed on the pattern forming the discharge electrode 3 in FIG. 1 and applied to a thickness of about 500 μm.

S3 dries the ABL glass paste. This is because the ABL glass paste was screen-printed and applied to the pattern of the discharge electrode 3 in FIG. 1 in S2, so that the ABL glass paste of the applied pattern is dried with hot air at 100 ° C. for 1 hour.

S4 is fired. This is dried with hot air in S3 and then fired at 500 ° C to 600 ° C. The firing may be performed by irradiation with an infrared lamp or placed in a firing furnace (see FIG. 8).

In S5, a lead wire is attached to the electrode. The lead wire 6 is ultrasonically soldered to the discharge electrode 3 of FIG. 1 after firing in S4.

As described above, it is possible to screen-print the ABL glass paste on the heat-resistant glass 1 of FIG. 1, dry and bake it, and form a long-life discharge electrode 3 that does not deteriorate due to electronically conductive corona discharge. rice field.

The details will be described below in order.

FIG. 3 shows a flowchart of the ABL glass paste coating method of the present invention. This shows the detailed flowchart of S2, S3, and S4 of FIG. 2 described above.

In FIG. 3, S11 screen-prints the ABL glass paste and applies it to the substrate. This screen prints the ABL glass paste so that it has the pattern of the discharge electrode 3 of FIG.

S12 is left in a dry atmosphere. After screen printing in S11, this is left in a dry atmosphere for 2 to 24 hours and naturally dried.

In S13, the solvent is blown off. This is air-dried in S12 and then dried in an electric furnace at 40-100 ° C. for 100 minutes in order to completely evaporate the solvent.

S14 is fired. This is placed in an electric furnace at 500 ° C to 600 ° C, or irradiated with an infrared lamp and fired (see FIG. 8), and the pattern of the discharge electrode 3 (applied with ABL glass paste) becomes completely conductive glass. As well as annealing in this way, it is fixed to the heat-resistant glass 1.

As described above, the pattern of the discharge electrode 3 is screen-printed on the heat-resistant glass 1 of FIG. 1 using ABL glass paste, and is naturally dried, hot-air dried, and fired. It has become possible to form the discharge electrode 3 of the conductive glass of.

FIG. 4 shows an explanatory diagram of the ABL glass paste of the present invention. This shows an explanatory diagram of ABL glass paste (conductive glass paste) used for screen printing.

In FIG. 4, component examples show examples of components required to prepare an ABL glass paste. Here, the illustrated components, concentration range (% by weight), and remarks are as follows.

Ingredient example Concentration range (% by weight) Remarks ・ Vanadate glass 60-85 Main material:
Powder 2-3 μm ABL glass 2-3 μm Powder ・ Diethylene glycol 10-30 Organic material (bonds main material particles)
Monobutyl acetate ・ Terpineol 5 to 15 Organic solvent (paste concentration adjustment)
・ Cellulose resin 1 to 10 resin (adhesive to coating material)
Here, the vanadate glass of the component example is a main material, and the powder of about 2 to 3 μm is composed of 60 to 85% by weight. Next, diethylene glycol and monobutylacetate are organic materials that bind main material particles and consist of 10 to 30% by weight. Next, terpineol is an organic solvent that adjusts the paste concentration and comprises 5 to 15% by weight. The next cellulosic resin is for adhering to a coating material (here, the heat-resistant glass 1 in FIG. 1) and comprises 1 to 10% by weight.

ABL glass paste can be prepared by mixing and kneading at the above ratio.

FIG. 5 shows an explanatory diagram of an example of screen printing conditions of the present invention. FIG. 5 shows an outline of printing conditions when the pattern of the discharge electrode (conductive glass) 3 is screen-printed on the heat-resistant glass plate 1 of FIG. 1 using the ABL glass paste in S11 of FIG. ..

In FIG. 5, the items are items for screen printing, the condition example is the conditions for screen printing of each item, and the remarks describe information such as each item, the material required for the condition, and the particle size. For example, the following is illustrated.

Item Condition Example Remarks ・ Screen wire diameter 16 μm The effect of corrosion by the paste solvent
No material ・ Mesh 325 pieces / inch
・ ABL glass, which is the main material of the 62 μm paste
Sufficiently larger than particle size ・ Porosity 63%
Here, the screen wire diameter is the wire diameter of the screen mesh at the time of screen printing, and 16 μm is used here. The screen mesh needs to be a material that is not affected by the solvent-induced corrosion of the ABL glass paste.

A mesh of 325 lines / inch was used. The opening was a mesh opening, and 62 μm was used. The porosity of the mesh was 63%.

By screen printing having the above items, conditions, and remarks, the screen printing of S11 of FIG. 3 described above was performed.

FIG. 6 shows an explanatory view of an example of ultrasonic soldering conditions of the present invention. FIG. 6 is an explanatory diagram of an example of conditions when the lead wire 6 is ultrasonically soldered to the discharge electrode (conductive glass) 3 of FIG.

In FIG. 6, the items are the items at the time of ultrasonic soldering, and the condition example is the conditions at the time of ultrasonic soldering of each item.

Item Condition example Remarks ・ Ultrasonic output 1 to 10W
・ Solder material Tin-zinc solder material
・ Trowel tip temperature 250 ℃ or more and 450 ℃ or less ・ Ultrasonic frequency 20-60KHz
Here, the ultrasonic output is the output of ultrasonic waves at the time of ultrasonic soldering, and is used here within the range of 1 to 10 W (preferably about 2 W or less). The solder material is a solder material used for ultrasonic soldering, and here, tin-zinc-based lead-free solder was used. The iron tip temperature is the temperature of the iron tip of the soldering iron to be ultrasonically soldered, and was used at a temperature in the range of 250 ° C to 450 ° C (the temperature depends on the solder material used, so it is the optimum iron for experiments. Determine the destination temperature). As the ultrasonic frequency, the ultrasonic frequency in the range of 20 to 60 KHz was used in the experiment.

By ultrasonic soldering with the above items and conditions, the lead wire 6 could be ultrasonically soldered to the discharge electrode (conductive glass) 3 of FIG. In normal soldering without ultrasonic waves, soldering defects occurred and soldering was not possible.

FIG. 7 shows an explanatory diagram of an example of operating conditions for the corona discharge of the present invention. This formed the discharge electrode (conductive glass) 3 of FIG. 1 described above, an opposed flat flat plate (larger area than the discharge electrode 3), or the discharge electrode 3 of the heat-resistant glass plate 1. A high-frequency voltage (about 10 KHz to 40 KHz) is applied between the flat plate (larger area than the discharge electrode 3) facing the back surface opposite to the front surface, and the corona discharge covers the discharge electrode 3. An example of the operating conditions for the electric discharge is shown (see FIG. 10).

In FIG. 7, the items are the items when the corona discharge is performed, and the condition example is the condition when the corona discharge is performed for each item.

Item Condition example Remarks ・ Applied voltage 2 to 10KV
-Frequency about 10 to 40 KHz Here, the applied voltage is the voltage applied when corona discharge is performed, and was used within the range of 2 to 10 KV. In addition, the frequency is the frequency at which corona discharge occurs, and when the frequency is 10 KHz or less, there is a high probability that atoms such as oxygen and nitrogen in the air will collide with the electrode and sputter the electrode and wear it. Here, it was set to 10 KHz to 40 KHz.

By providing the above items and conditions, it was possible to discharge the corona so as to cover the discharge electrode (conductive glass) 3 of FIG. 1 (see FIG. 10 described later).

FIG. 8 shows a sample example of the present invention. This shows an example in which the firing conditions, the presence or absence of grooves, and the resistivity were measured for the sample of the discharge electrode (conductive glass) 3 prepared according to the order of the flow charts in FIG.

In FIG. 8, No is the sample number, the firing condition is the temperature condition in which the ABL glass paste is applied and fired, the groove is the presence or absence of the groove on the heat-resistant glass plate 1 in FIG. 1, and the resistivity is The resistivity (Ω · cm) from the lead wire 6 to the end of the discharge electrode 3.

No Firing conditions From the groove lead wire to the electrode end
Resistivity up to
(Ω ・ cm)
(1) Baking twice (600 ℃ 30min quenching + 550 ℃ 30min) Yes 91.4
(2) Baking twice (600 ℃ 30min quenching + 550 ℃ 30min) None 75.1
(3) Single firing (600 ℃ 30min) Yes 47.6
(4) Single firing (600 ℃ 30min) None 56.4
(5) Single firing (570 ℃ 30min) Yes 103.6
(6) Single firing (570 ℃ 30min) None 51.1
(7) Single firing 600 ℃ 30min quenching) None 192.3
Here, the firing condition of the sample (1) represents a sample that has been heated at 600 ° C. for 30 minutes and then rapidly cooled, then heated at 550 ° C. for 30 minutes, and then naturally cooled. The same applies to others.

Further, in each of the samples (1) to (7), the resistance value from the lead wire 6 in FIG. 1 to the end of the discharge electrode (conductive glass) 3 is 200 to 47 Ω · cm as shown in the figure, and the corona discharge is performed. It was able to be generated well. Further, since the discharge electrode 3 is made of electron-conductive glass, deterioration due to corona discharge is extremely small, and the life of the discharge electrode 3 can be extended as compared with the conventional stainless discharge electrode. Further, although the resistivity was slightly different with or without the groove for the discharge electrode 3 on the heat-resistant glass plate 1 of FIG. 1, the resistivity was sufficient for corona discharge.

FIG. 9 shows an explanatory diagram of the difference in crystallinity depending on the firing conditions of the present invention.

FIG. 9A shows an example of an optical micrograph of the surface of the conductive electrode 3 rapidly cooled at 600 ° C. for 30 min, and FIG. 9B shows an optical micrograph of the surface of the conductive electrode 3 naturally cooled at 570 ° C. for 30 min. An example is shown, and FIG. 9 (c) shows an example of an optical micrograph of the surface of the conductive electrode 3 naturally cooled at 600 ° C. for 30 minutes.

In FIG. 9, as shown on the upper side, the crystal particles in FIG. 9A are the smallest, and are larger in the directions of FIG. 9B and FIG. 9C. This is because, in FIG. 9A, the temperature is as high as 600 ° C., but since it is rapidly cooled, the high temperature state remains as it is and the crystal particles are small. On the other hand, in FIGS. 9B and 9C, the temperatures were as high as 570 ° C. and 600 ° C., and the particles were naturally cooled, so that the crystal particles grew during cooling and gradually became larger. By selecting a firing temperature that is convenient for corona discharge and quenching / natural cooling, it is possible to adjust the size of the crystal particles on the surface of the discharge electrode 3 from small to large, so it is necessary. The optimum firing temperature, quenching or natural cooling may be selected and fired accordingly.

FIG. 10 shows an explanatory diagram of the presence or absence of a groove of the present invention. This is a schematic description of the presence or absence of a groove in the discharge electrode 3 formed on the heat-resistant glass plate 1 of FIG.

FIG. 10 (a) schematically shows a cross-sectional view of the heat-resistant glass plate 1 of FIG. 1 when there is a groove, and FIG. 10 (b) shows a heat-resistant glass plate of FIG. 1 when there is no groove. The cross-sectional view of 1 is schematically shown.

In FIG. 10A, the illustrated conductive glass 31 after the conductive glass paste is applied to the groove and fired (2 to 3 times) is in a state of being contained inside the heat-resistant glass plate 1. As shown in the figure, the angle of the corona discharge becomes narrower than that in FIG. 10B, and the corona discharge can be concentratedly applied to the corona discharge treated object.

In FIG. 10B, the conductive glass 32 shown in the figure after the conductive glass paste is directly applied and baked on the heat-resistant glass plate 1 having no groove is in a convex state on the heat-resistant glass plate 1. As shown in the figure, the angle of the corona discharge becomes wider than that in FIG. 10A, and the corona discharge can be applied to a wide range of the corona discharge processing object.

FIG. 10 (c) is a table showing the features of with and without grooving, and is shown below.

Grooving (with) Grooving (without)
・ Number of prints 2 times 1 time ・ Discharge direction Yes No
・ Easy and difficult to store ・ Electrode thickness Depends on groove height 500 μm or less Here, with grooving is the case of (a) with a groove, and without grooving, there is no groove (with no groove). The case of b) is represented. The number of prints represents the number of times the conductive glass paste is applied and fired. If groove processing is performed, the conductive glass paste printed inside the groove is significantly reduced by firing, so twice (3 if necessary). It is necessary to print (times). When there is no groove, there is no particular problem in that the thickness is reduced even if the size is reduced, and one printing is sufficient.

As for the discharge direction, as described above, the grooving (with) has a discharge direction in which the irradiation direction of the corona discharge is narrow. On the other hand, grooving (without) has no discharge direction.

As for storability, when grooving is provided, stacking is easy and storage is easy. On the other hand, when there is no grooving, the discharge electrode 3 pops out on the heat-resistant glass plate 1, cannot be stacked, and is difficult to store.

The electrode thickness depends on the height of the groove when grooving is performed. When there is no grooving, it has a semicircular shape as shown in FIG. 10B, and is usually 500 μm or less.

FIG. 11 shows an explanatory diagram of the electrode material of the present invention. This is the initial voltage (V) for corona discharge when various materials are used as the discharge electrode 3 in FIG. 1.

In FIG. 11, the electrode material is the material of the discharge electrode for corona discharge, and the initial voltage (V) is the initial voltage for starting corona discharge, for example, the following in the figure.

Electrode material Initial voltage (V)
・ Tungsten 5.0-6.0
・ Stainless steel 5.0-6.0
・ ABL glass (electroconducting glass) 3.7-4.0
Coarse crystals
・ ABL glass (electroconducting glass) 4.5 to 4.8
A little coarse crystal
・ ABL glass (electroconductive glass) 4.0-5.0
Fine crystals
Here, the conventional initial voltage of tungsten and stainless steel has an initial voltage of 5 to 6 KV. The discharge electrode 3 of the ABL glass (electroconductive glass) of the present invention has a coarse crystal of 3.7 to 4.0 KV. The voltage is 4.5 to 4.8 KVV for slightly coarse crystals and 4.9 to 5.0 KV for fine crystals. In any case, the corona discharge is started at a lower initial voltage than conventional metals such as stainless steel. Turned out to keep.

FIG. 12 shows a structural example of the electrode portion of the present invention. This schematically shows a structure in which a hole is made in the heat-resistant glass plate 1 of FIG. 1 and a lead wire 6 is ultrasonically soldered directly from the hole to the back surface of the discharge electrode (conductive glass) 3. ..

In FIG. 12, the hole 9 is a hole formed from the back surface of the heat-resistant glass plate 1 toward the back surface of the discharge electrode (conductive glass) 3.

By providing the holes 9 as described above, the discharge electrode (conductive glass) 3 having a groove (or no groove) is applied and fired on the heat-resistant glass plate 1, and then the lead wire 6 is formed in the hole 9. Ultrasonic soldering 8 is performed on the discharge electrode (conductive glass) 3 via the inside, and the lead wire 6 is connected to the discharge electrode 3. As a result, only the discharge electrode 3 is exposed on the upper surface of the heat-resistant glass plate 1 in the drawing, and the protrusions when the lead wire 6 is superposed on the end of the discharge electrode 3 in FIG. 1 from above and ultrasonically soldered. It is possible to eliminate the disturbance of the corona discharge at the end of the discharge electrode 3 and realize a uniform corona discharge even at the end of the discharge electrode 3.

This is a configuration example of the discharge electrode plate of the present invention. It is a manufacturing process flowchart of this invention. It is a flowchart of the ABL glass paste coating method of this invention. It is explanatory drawing of ABL glass paste of this invention. It is explanatory drawing of the screen printing condition example of this invention. It is explanatory drawing of the ultrasonic soldering condition example of this invention. It is explanatory drawing of the operation condition example of the corona discharge of this invention. This is an example of a sample specification of the present invention. It is explanatory drawing of the difference in crystallinity by the firing condition of this invention. It is explanatory drawing of presence / absence of a groove of this invention. It is explanatory drawing of the electrode material of this invention. This is a structural example of the electrode portion of the present invention.

1: Heat-resistant glass plate 2, 9: Hole 3: Discharge electrode (conductive glass, ABL glass)
31, 32: Conductive glass 5: Soldering (ultrasonic soldering)
6: Lead wire 8: Ultrasonic soldering

Claims (7)

In a discharge electrode plate that forms an elongated discharge electrode for corona discharge,
A heat-resistant board made of heat-resistant material and
A discharge electrode formed by coating and firing conductive glass in an elongated groove formed on the heat-resistant plate or on the heat-resistant plate.
With
A discharge electrode plate characterized in that the discharge electrode is formed of electronically conductive conductive glass to reduce deterioration due to corona discharge and extend the life. The discharge electrode plate according to claim 1, wherein the conductive glass is vanadate glass composed of vanadium, barium, and iron. The discharge electrode plate according to any one of claims 1 to 2, wherein the heat-resistant plate is made of heat-resistant glass. The discharge electrode plate according to any one of claims 1 to 3, wherein the lead wire is connected by soldering to the discharge electrode. The discharge electrode plate according to claim 1, wherein the lead wire is soldered to the discharge electrode by ultrasonic soldering. The formation of a discharge electrode by applying and firing conductive glass is characterized in that a paste containing a powder of conductive glass is generated, and the produced paste is applied and fired to form an electronically conductive discharge electrode. The discharge electrode plate according to any one of claims 1 to 5. A feature is that a high-frequency voltage in the range of 10 KHz to 30 KHz is applied between the other electrode facing the discharge electrode or the other electrode on the back surface, and corona discharge is performed around the discharge electrode. The discharge electrode according to any one of claims 1 to 6.

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