TWI716193B - Discharge electrode plate - Google Patents

Abstract

The present invention relates to a discharge electrode plate for forming an elongated discharge electrode for corona discharge; and an objective thereof is to reduce deterioration due to corona discharge and extend its life.

The discharge electrode of the present invention includes: a heat-resistant plate made of a heat-resistant material, and a discharge electrode formed by applying and baking conductive glass in a long and narrow groove formed on the heat-resistant plate or elongated on the heat-resistant plate; the discharge electrode is formed of an electronically conductive glass to reduce deterioration due to corona discharge and extend its life.

Description

Discharge electrode plate

The present invention relates to a discharge electrode plate forming an elongated discharge electrode to generate corona discharge.

Conventionally, as one of the methods for modifying the surface of a polymer resin so that the smooth surface has small irregularities or thorns, there has been a method by atmospheric corona discharge.

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

When the surface of the polymer resin has small irregularities, it changes from water repellency to hydrophilicity. For example, as an applied product, it is convenient if the surface of the curtain of dried seaweed has small irregularities. According to this, although the seaweed retrieved from the seawater has corresponding adhesion, when the surface of the polymer resin is smooth, the adhesion cannot be obtained, and the seaweed cannot adhere to the curtain.

Therefore, the surface modification treatment of the polymer resin is performed by causing corona discharge in the atmosphere. Conventionally, metals (for example, stainless steel, tungsten) have been used for the material of the discharge electrode.

However, when metal (stainless steel, tungsten) is used as the conventional discharge material for corona discharge, a large amount of ozone O3 is generated under the corona discharge plasma, so the surface is in a very short time (the fast case is About 1 week) oxidize, and the electron supply from the surface of the discharge electrode cannot be performed smoothly, and there is a problem that it cannot be used.

In addition, there is also a problem that the surface of the discharge electrode is oxidized in a short period of time (about 1 week) and cannot be discharged, and the discharge electrode needs to be replaced.

The inventors of the present invention have found through experiments that even if conductive glass is used as a discharge electrode material and corona discharge is performed, electrons can be supplied smoothly for a long period of time.

Therefore, with regard to the discharge electrode plate of the present invention, the discharge electrode plate to be formed into the elongated discharge electrode for corona discharge is provided with a heat-resistant plate made of a heat-resistant material and a discharge electrode. The discharge electrode system It is formed by coating elongated conductive glass on a heat-resistant plate, or coating conductive glass in a slender groove formed on a heat-resistant plate, and firing; the discharge electrode is formed by electronic conductivity The formation of non-functional glass reduces the deterioration caused by corona discharge and extends its life.

In this case, the conductive glass is vanadate glass composed of vanadium, barium, and iron.

In addition, the heat-resistant plate is heat-resistant glass.

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

In addition, the welding of the lead wire of the discharge electrode adopts ultrasonic welding.

In addition, when a discharge electrode is formed by coating and firing conductive glass, it is performed by generating a paste containing a powder of conductive glass and applying the generated paste Fired to form an electronically conductive discharge electrode.

In addition, when the discharge electrode faces other electrodes, or the discharge electrode faces other electrodes, a high-frequency voltage in the range of 10KHz to 30KHz is applied between the discharge electrode and the other electrodes to cause corona discharge around the discharge electrode.

1: Heat-resistant glass plate

2: hole

9: Hole

3: Discharge electrode (conductive glass, ABL glass)

5: Welding (ultrasonic welding)

6: Wire

8: Ultrasonic welding

31: Conductive glass

32: Conductive glass

Figure 1 shows an example of the configuration of the discharge electrode plate of the present invention.

Figure 2 is a flowchart of the manufacturing steps of the present invention.

Figure 3 is a flow chart of the ABL glass paste coating method of the present invention.

Figure 4 is an explanatory diagram of the ABL glass paste of the present invention.

Figure 5 is an explanatory diagram of an example of screen printing conditions of the present invention.

Figure 6 is an explanatory diagram of an example of ultrasonic welding conditions of the present invention.

Figure 7 is an explanatory diagram of an example of the corona discharge operating conditions of the present invention.

Figure 8 is an example of the sample specifications of the present invention.

Fig. 9 is an explanatory diagram of the crystallinity difference of the firing conditions according to the present invention.

Figure 10 is an explanatory diagram of the presence or absence of grooves in the present invention.

Fig. 11 is an explanatory diagram of the electrode material of the present invention.

Figure 12 shows an example of the structure of the electrode portion of the present invention.

Figure 1 shows an example of the configuration of the discharge electrode plate of the present invention.

In Figure 1, the heat-resistant glass plate 1 is the one that holds the discharge electrode 3, and it can bear A heat-resistant board that is subject to high temperatures caused by corona discharge.

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

The discharge electrode 3 is an electrode to be corona discharge, and here is an elongated electrode formed by coating and firing conductive glass. In the experiment, the width is about 1mm to 30mm, the length is 10cm, and, if it is achievable, it can be longer.

The welding 5 system schematically shows that the wire 6 is welded. Here, since the discharge electrode 3 is made of conductive glass, the lead wire 6 is welded by ultrasonic welding. It is difficult to use ordinary welding without ultrasonic wave.

The lead wire 6 is welded to the discharge electrode 3, and a high-frequency voltage is applied, and the power supply for corona discharge around the discharge electrode 3 is supplied.

Next, the manufacturing steps of Fig. 1 will be described in detail in the order of the flowchart of Fig. 2.

Figure 2 shows a flow chart of the manufacturing steps of the present invention.

In Figure 2, the S1 system prepares ABL glass paste. This is to prepare the ABL glass paste (name of the conductive glass paste) that belongs to the conductive paste to form the discharge electrode (conductive glass) 3 of Fig. 1 (refer to Fig. 4 described later).

S2 is coated with ABL glass paste. This is to screen-print the ABL glass paste prepared by S1 on the pattern to form the discharge electrode 3 of Figure 1, and apply it to a thickness of about 500 μm.

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

S4 series firing. This is after being dried by hot air in S3, then firing at 500°C to 600°C. The firing can be irradiated with an infrared lamp or placed in a firing furnace (refer to Figure 8).

S5 attaches the wire to the electrode. After firing in S4, the wire 6 is ultrasonically welded to the discharge electrode 3 in Figure 1.

As described above, the ABL glass paste is screen-printed, dried, and fired on the heat-resistant glass plate 1 in Figure 1, so that a long-life discharge electrode 3 that is not deteriorated by the corona discharge of electronic conductivity can be formed .

The detailed description will be given in order below.

Figure 3 shows a flow chart of the ABL glass paste coating method of the present invention. This is a detailed flowchart showing S2, S3, and S4 in Figure 2 above.

In Figure 3, S11 screen-printed ABL glass paste and applied it to the substrate. This is to screen-print the ABL glass paste so that it becomes the pattern of the discharge electrode 3 in Figure 1.

S12 is placed in a dry atmosphere. This is after screen printing in S11, and then placed in a dry atmosphere for 2 to 24 hours for natural drying.

S13 removes the solvent. This is after natural drying in S12, in order to completely evaporate the solvent, drying is performed at 40 to 100°C for 100 minutes in an electric furnace.

S14 series firing. This is placed in an electric furnace at 500°C to 600°C or irradiated with an infrared lamp and fired (refer to Fig. 8), and annealed in such a way that the pattern of the discharge electrode 3 (coated with ABL glass paste) becomes conductive glass. At the same time, it is fixed to the heat-resistant glass plate 1.

According to the above, using ABL glass paste to screen the pattern of the discharge electrode 3 on the heat-resistant glass plate 1 shown in Fig. 1, natural drying, hot air drying, and firing can be performed. A discharge electrode 3 of conductive glass that has low resistance and is not degraded to corona discharge and has a long life is formed.

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

In Fig. 4, the composition example shows an example of the composition required to make ABL glass paste. Here, the ingredients, concentration range (weight%), and remarks shown in the figure are as follows.

Here, the vanadate glass of the component example is the main material, and the powder of about 2 to 3 μm constitutes 60 to 85% by weight. Secondly, diethylene glycol and monobutyl acetate are organic materials that bind the main material particles and constitute 10 to 30% by weight. Secondly, terpineol is an organic solvent that adjusts the paste concentration and constitutes 5 to 15% by weight. Next, the cellulose resin is used to adhere to the coating material (here, the heat-resistant glass plate 1 in Figure 1), and constitutes 1 to 10% by weight.

The ABL glass paste can be made by mixing and kneading in the above ratio.

Figure 5 is an explanatory diagram showing an example of screen printing conditions of the present invention. Fig. 5 shows an outline of the 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 ABL glass paste in S11 of Fig. 3.

In Figure 5, the items are the items for screen printing, the condition examples are the conditions for screen printing of each item, and the remarks are those that describe the materials and particle size required for each item and condition, such as the figure The following are shown in.

Here, the wire diameter of the screen is the wire diameter of the screen mesh during screen printing, and 16μm is used here. The screen mesh must be a material that is not affected by the corrosion caused by the solvent of the ABL glass paste.

The mesh system uses 325 threads/inch. The aperture is the aperture of the mesh, 62μm is used. The porosity of the mesh is 63%.

By screen printing with the above items, conditions, and remarks, the screen printing of S11 in Figure 3 above is implemented.

Fig. 6 is an explanatory diagram showing an example of ultrasonic welding conditions of the present invention. Fig. 6 is an explanatory diagram of an example of conditions when the lead wire 6 is subjected to ultrasonic welding on the discharge electrode (conductive glass) 3 of Fig. 1.

In Figure 6, the items are the items when ultrasonic welding is performed, and the condition examples are the conditions of each item when ultrasonic welding is performed.

Here, the ultrasonic power is the power of the ultrasonic wave when performing ultrasonic welding, and is used here in the range of 1 to 10W (preferably set to about 2W or less). The soldering material is the soldering material used for ultrasonic welding, and tin-zinc lead-free solder is used here. The temperature of the soldering iron tip is the temperature of the soldering iron tip of the soldering iron used for ultrasonic welding. It is used within the temperature range of 250°C to 450°C (because the temperature depends on the soldering material used, the best soldering iron tip temperature is determined by experiment) . Ultrasonic frequency, the ultrasonic frequency in the range of 20 to 60KHz was used in the experiment.

By ultrasonic welding with the above items and conditions, the lead 6 can be ultrasonically welded neatly to the discharge electrode (conductive glass) 3 shown in Figure 1. In normal welding without ultrasonic waves, poor welding occurs and welding is impossible.

Fig. 7 is an explanatory diagram showing an example of the operating conditions of the corona discharge of the present invention. This is shown: the discharge electrode (conductive glass) 3 in the aforementioned first figure and "a flat plate not shown in the figure facing the discharge electrode 3 (larger area than the discharge electrode 3)" or "and the heat-resistant glass plate 1 A high-frequency voltage (approximately 10KHz to 40KHz) is applied between a flat plate (larger area than the discharge electrode 3), which is not shown in the figure, on the opposite side of the surface where the discharge electrode 3 is formed, and the discharge electrode 3 is covered. Example of operating conditions when corona discharge is performed in the above method (refer to Figure 10).

In Figure 7, the items are the items when corona discharge is performed, and the condition examples are the conditions of each item when corona discharge is performed.

Here, the applied voltage is the voltage applied during corona discharge and is used in the range of 2 to 10KV. In addition, the frequency is the frequency when corona discharge is performed. When the frequency becomes 10KHz or less, the oxygen, nitrogen and other atoms in the air will collide with the electrode to cause the electrode to sputter and cause a higher probability of wear, so it is set here as 10KHz To 40KHz.

By having the above items and conditions, it is possible to perform corona discharge so as to cover the discharge electrode (conductive glass) 3 in Fig. 1 (refer to Fig. 10 described later).

Figure 8 shows a sample example of the present invention. This is an example of the firing conditions, the presence or absence of grooves, and the measurement of electrical resistivity for a sample of the discharge electrode (conductive glass) 3 produced in the sequence of the flowchart in Fig. 2.

In Figure 8, No is the sample number, the firing conditions are the temperature conditions for applying ABL glass paste and firing, the grooves are the presence or absence of grooves on the heat-resistant glass plate 1 in Figure 1, and the resistivity is from the lead 6 Resistivity to the end of discharge electrode 3 (Ω‧cm).

Here, the firing condition of the sample (1) means a sample obtained by heating at 600°C for 30 minutes and then rapidly cooling, followed by heating at 550°C for 30 minutes and then naturally cooling. The other is the same.

In addition, the resistance value of the lead 6 to the end of the discharge electrode (conductive glass) 3 in the first figure of any one of the samples (1) to (7), as shown in the figure, is all 200 to 47Ω‧cm, And can produce corona discharge well. Furthermore, the discharge electrode 3 is made of electronically conductive glass, and the deterioration caused by corona discharge is extremely small, and the life span of the discharge electrode 3 is longer than that of the conventional stainless steel discharge electrode. In addition, although the presence or absence of the groove for the discharge electrode 3 on the heat-resistant glass plate 1 of Fig. 1 may cause a slight difference in resistivity, the resistivity is sufficient for corona discharge.

Fig. 9 shows an explanatory diagram of the crystallinity difference of the firing conditions according to the present invention.

Figure 9(a) shows an example of an optical microscope photograph of the surface of the discharge electrode 3 at 600°C for 30 minutes and rapid cooling, and Figure 9(b) shows an example of a photomicrograph taken at 570°C for 30 minutes under natural cooling. An example of an optical microscope photograph of the surface of the electric electrode 3, Figure 9(c) shows an example of an optical microscope photograph of the surface of the discharge electrode 3 that is naturally cooled at 600°C for 30 minutes.

In Fig. 9, as shown on the upper side, the crystal particles in Fig. 9(a) are the smallest and gradually become larger in the directions of Figs. 9(b) and 9(c). This is that although the temperature in Figure 9(a) is as high as 600°C, it is rapidly cooled to maintain a high temperature and small crystal particles. On the other hand, in Figs. 9(b) and (c), the temperature is as high as 570°C and 600°C, and after natural cooling, the crystal particles grow and become larger during cooling. By choosing the firing temperature, rapid cooling/natural cooling that is convenient for corona discharge, the size of the crystal particles on the surface of the discharge electrode 3 can be adjusted from small to large. Therefore, the best firing temperature, rapid cooling or natural cooling can be selected according to needs. It can be fired by cooling.

Fig. 10 is an explanatory diagram showing the presence or absence of grooves in the present invention. This is a schematic illustration of the presence or absence of the grooves of 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 with grooves, and Fig. 10(b) schematically shows Fig. 1 without grooves The cross-sectional view of the heat-resistant glass plate 1.

In Figure 10(a), the conductive glass 31 shown in the figure after applying a conductive glass paste in the groove and firing (2 to 3 times) is in a state of being housed inside the heat-resistant glass plate 1, and The angle of the corona discharge is as shown in the figure, which is narrower than that in Fig. 10(b), and the corona discharge can be concentrated and irradiated to the corona discharge treatment object.

In Figure 10(b), the conductive glass paste is directly coated on the heat-resistant glass plate 1 without grooves, and the conductive glass 32 shown in the figure after firing is in a convex state on the heat-resistant glass plate 1. The angle of the corona discharge is as shown in the figure, which is wider than that in Fig. 10(a), and the corona discharge can be irradiated to a wide range of the corona discharge treatment object.

Figure 10(c) is a table showing the characteristics of grooved and non-grooved processing, as shown in the figure below.

Here, the grooved processing means the case of Figure 10 (a) with grooves, and the non-groove processing means the case of Figure 10 (b) without grooves. The number of times of printing means the number of times the conductive glass paste is coated and fired. In the case of groove processing, since the conductive glass paste printed inside the groove is greatly reduced by firing, it must be carried out twice (in response to Perform 3 times) printing if necessary. In the case of no groove, even if it is reduced, only the thickness is reduced, so there is no special problem, and only one printing is required.

Regarding the discharge directivity, as described above, the corona discharge has a narrow irradiation direction and has discharge directivity. On the other hand, groove machining (none) has no discharge directionality.

In terms of storage properties, in the case of groove processing, it is easy to stack and easy to store. On the other hand, in the case of grooveless processing, the discharge electrode 3 protrudes on the heat-resistant glass plate 1 and cannot be stacked and is difficult to store.

The thickness of the electrode depends on the height of the groove when the groove is processed. In the case of non-groove processing, as shown in Fig. 10(b), it has a semicircular shape and is usually 500 μm or less.

Fig. 11 shows an explanatory view of the electrode material of the present invention. This is when using various When the material is used as the discharge electrode 3 in Figure 1, the initial voltage (V) required for corona discharge.

In Figure 11, the electrode material is the material of the discharge electrode to be corona discharge, and the initial voltage (V) is the initial voltage to start the corona discharge, such as the following shown in the figure.

Here, the initial voltage of tungsten and stainless steel in the past has an initial voltage of 5 to 6KV. The discharge electrode 3 of the ABL glass (electronic conductive glass) of the present invention is 3.7 to 4.0 KV in coarse crystals, 4.5 to 4.8 KV in slightly coarse crystals, and 4.9 to 5.0 KV in fine crystals. And it is determined that any of them can start and maintain corona discharge at a lower initial voltage than conventional metals such as stainless steel.

Figure 12 shows an example of the structure of the electrode portion of the present invention. This is schematically shown in the structure of the heat-resistant glass plate 1 shown in FIG. 1 with a hole, and a wire 6 is directly ultrasonically welded to the back of the discharge electrode (conductive glass) 3 from the hole.

In Figure 12, the hole 9 is from the back of the heat-resistant glass plate 1 toward the discharge electrode (conducting Electrical glass) 3 with an open hole on the back.

As described above, by providing the hole 9, after coating and firing a grooved (or non-groove) discharge electrode (conductive glass) 3 on the heat-resistant glass plate 1, the lead 6 is passed through the inside of the hole 9 Ultrasonic welding 8 is performed on the discharge electrode (conductive glass) 3, and the lead wire 6 is connected to the discharge electrode 3. According to this, the upper surface shown in the figure of the heat-resistant glass plate 1 is in a state where only the discharge electrode 3 is exposed, eliminating the problem when the lead wire 6 is overlapped on the end of the discharge electrode 3 in Figure 1 and ultrasonic welding is performed. Protrusions, etc., and eliminate the interference of corona discharge at the end of the discharge electrode 3, and even at the end of the discharge electrode 3, a uniform corona discharge can be realized.

Claims (9)

A discharge electrode plate is a discharge electrode plate to be formed into a slender discharge electrode for corona discharge. The discharge electrode plate is provided with a heat-resistant plate made of a heat-resistant material and a discharge electrode. The discharge electrode is based on the aforementioned heat resistance. It is formed by coating elongated conductive glass on the plate, or coating conductive glass in the elongated grooves formed on the heat-resistant plate, and firing; wherein, the conductive glass is made of vanadium, barium, The vanadate glass made of iron is annealed to become a low resistance; the discharge electrode is formed of an electronically conductive conductive glass, and the low resistance is formed by annealing at the same time as the firing. Reduce the deterioration caused by corona discharge and extend its life. The discharge electrode plate according to the first item of the patent application, wherein the heat-resistant plate is heat-resistant glass. The discharge electrode plate described in the first item of the scope of patent application, wherein a lead wire is welded to the discharge electrode. The discharge electrode plate according to the second item of the scope of patent application, wherein a lead wire is welded to the discharge electrode. The discharge electrode plate described in the third item of the scope of patent application, wherein the welding of the lead wire of the aforementioned discharge electrode is ultrasonic welding. The discharge electrode plate described in item 4 of the scope of patent application, wherein the welding of the lead wire of the aforementioned discharge electrode adopts ultrasonic welding. The discharge electrode plate according to any one of the 1st to 6th items of the scope of patent application, wherein, when the discharge electrode is formed by coating and firing conductive glass, it is produced by generating a powder containing conductive glass Then, the resultant paste is applied and fired to form an electronically conductive discharge electrode. The discharge electrode plate described in any one of items 1 to 6 of the scope of patent application, wherein the discharge electrode faces other electrodes, or the discharge electrode faces other electrodes, and 10KHz is applied between the discharge electrodes and the other electrodes The high-frequency voltage in the range of 30KHz causes corona discharge around the discharge electrode. The discharge electrode plate described in item 7 of the scope of patent application, wherein the discharge electrode faces the other electrodes, or the discharge electrode faces the other electrodes, and the discharge electrode is applied between the discharge electrode and the other electrodes in the range of 10KHz to 30KHz High-frequency voltage causes corona discharge around the discharge electrode.

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