JP3388115B2 - Antistatic filter and method and apparatus for forming conductive pattern for molded filter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antistatic filter in which a conductive pattern of a conductive ink is applied and formed on a filter material surface of a molding filter in which peaks and valleys are alternately and continuously formed, and the above molding filter. The present invention relates to a method and apparatus for applying and forming a conductive pattern on a substrate.

[0002]

2. Description of the Related Art In a bag filter used in a dry dust collector or the like, static electricity is accumulated due to repeated contact and separation between the collected dust and filter cloth, friction between dusts, etc. When the voltage reaches the insulation potential or higher, discharge is generated, and the discharge energy may cause ignition or explosion of a combustible material. Therefore, it is necessary to sequentially discharge and remove static electricity charged in the bag filter.

[0003] Therefore, conventionally, for example, the actual development of Shokai 50-143.
As disclosed in Japanese Patent No. 178 and Japanese Patent No. 56-172320, by using an antistatic filter in which a conductive pattern composed of a large number of ground lines is printed on the surface of a filter medium using a conductive ink, The charged static electricity was discharged through these conductive patterns.

[0004]

However, in the above-mentioned conventional antistatic filter, after the conductive pattern is printed and formed using the conductive ink on the surface of the filter material which is entirely formed into a flat sheet shape, the whole is formed into a bag shape. Or, it is sewn into a cylindrical shape, and when using this filter material to make a molded filter in which peaks and valleys are alternately and continuously formed, the filter material on which a conductive pattern is printed is repeatedly folded back to form a peak. It is necessary to continuously mold the ridges and valleys, and by repeating this folding operation, scratches and disconnections occur in a part of the printed conductive pattern, which causes variations in the conductive resistance and disturbs the discharge of static electricity. There was a problem to do.

Therefore, in order to solve various problems that occur during the folding-back molding, it has been considered that the molding material is repeatedly folded and molded, and then a conductive pattern is printed with a conductive ink on the molding surface. Since the above-mentioned peaks and troughs are continuously formed on the molding surface, formation by printing such as silk printing was impossible.

Although it has been considered that the conductive pattern is applied and formed by using an ink nozzle, if the ink nozzle is moved in a direction perpendicular to a line forming a peak portion and a valley portion of the molding filter. , When the coating surface moves from the peak portion to the valley portion, the coating surface suddenly drops downward to widen the distance between the ink nozzle and the peak portion and the valley portion, and thus the distance between the ink nozzle and the coating surface sharply increases. If the conductive ink is ejected from the ink nozzles with a constant pressure, the ejection amount will be insufficient at the valley portion, and as a result, coating will be formed on this valley portion. There is a problem in that the conductive resistance varies due to scratches or disconnection in a part of the conductive pattern.

Further, it has been considered to compensate for the insufficient discharge amount of the conductive ink in the valley by adjusting the moving speed of the ink nozzle in the valley to be slow. Since the moving speed of the ink nozzle must be changed in two steps according to the shape of the valley and the valley, not only the structure becomes complicated and the manufacturing cost becomes high, but also the coating speed becomes slow and the efficiency does not increase. was there.

Therefore, a technical problem of the present invention is that a conductive pattern consisting of a large number of ground lines made of conductive ink is formed on the surface of a filter material of a molding filter in which peaks and valleys are alternately formed continuously. By the way, another object of the present invention is to provide an antistatic filter devised so that it can be formed without slowing down the coating speed, a method for forming a conductive pattern for a molding filter used for manufacturing the antistatic filter, and an apparatus therefor.

[0009]

[Means for Solving the Problems] Means taken in the present invention for solving the above technical problems are as follows.

(1) A conductive pattern composed of a large number of ground lines is formed by using conductive ink on the filter medium surface of a molding filter in which peaks and valleys are alternately formed continuously. Apply and form diagonally to the line.

(2) The inclination angle α of the conductive pattern formed by coating obliquely with respect to the line forming the peaks and valleys is 40.
Set within °.

(3) When a conductive pattern composed of a large number of ground lines is formed by applying a conductive ink on the filter medium surface of a molding filter in which peaks and valleys are alternately formed continuously, a program is used. Applying and forming the above conductive pattern while discharging a certain amount of conductive ink from an ink nozzle that moves in the vertical and horizontal coordinate systems by coordinate control.

(4) An ink nozzle for applying and forming a conductive pattern of a conductive ink on the filter medium surface of the molding filter is slanted with respect to the line forming the peaks and valleys of the molding filter by coordinate control by a program. Applying and forming the above-mentioned conductive pattern in a substantially mesh shape while moving to.

(5) By coordinate control by a program, conductive ink is ejected onto the filter medium surface of the molding filter while moving in an oblique direction with respect to the line forming the peaks and valleys of the molding filter, and a large number of grounds are formed. A sensor that detects the peaks and valleys of the molding filter in an ink nozzle that is configured to apply and form a conductive pattern consisting of lines, and if this sensor detects the peaks of the molding filter, the ejection pressure of the conductive ink is weakened. Discharge pressure adjusting means for adjusting the discharge pressure of the conductive ink strongly when the sensor detects a valley portion.

Each means described in the above (1) to (5) operates as follows.

According to the means described in the above (1), since the conductive pattern is formed in an oblique direction with respect to the line forming the peak and the valley, the line forming the peak and the valley is formed. Compared to the one with a conductive pattern formed in a right angle direction,
It is possible to reduce the degree of gearup in the peaks and valleys as much as possible, and to gradually change the boundaries of both sides to a gentle slope, which results in a gentle slope of the peaks and valleys. It is possible to provide an antistatic filter in which conductive patterns of conductive ink are evenly applied and formed on both sides.

According to the means described in the above (2), the inclination angle α of the conductive pattern formed by inclining with respect to the line forming the peaks and valleys of the molding filter is 40.
By setting the temperature to be within °, it is possible to provide an antistatic filter in which the breakage of the conductive ink and the change in the coating amount are within the limit (determined by the conductive resistance value).

According to the means described in the above (3), a large number of grounds are provided on the filter medium surface of the molding filter while discharging a fixed amount of conductive ink from the ink nozzle which moves in the vertical and horizontal coordinate systems by coordinate control by the program. Since a conductive pattern consisting of lines is applied and formed, a programmed conductive pattern of an appropriate shape can be formed within a relatively short time regardless of the complicated uneven shape of the filter medium surface in which peaks and valleys are alternately formed continuously. It enables accurate coating formation.

According to the means described in (4) above, the conductive pattern is formed while moving the ink nozzles obliquely with respect to the line forming the peaks and valleys according to the coordinate control by the program. Compared to the case where the conductive pattern is formed by moving the ink nozzle in the direction perpendicular to the line that forms the peaks and valleys, the degree of gearup in the peaks and valleys should be minimized. Since the application surface at the boundary between the peak and the valley can be made into a gently sloping surface that gradually moves up and down, the ink nozzle will not run out in the valley and the discharge amount of the conductive ink will not be insufficient. It is possible to discharge the conductive ink evenly while moving at the same speed, and to form a conductive pattern without scratches and disconnections in a substantially mesh shape on both the peaks and the valleys.

When the conductive nozzle is ejected from the ink nozzle at the same pressure because the distance between the ink nozzle that moves in the vertical and horizontal coordinate systems by the program coordinate control and the molding filter is close in the mountain portion and far in the valley portion. , The discharge pressure is too strong on the surface of the adjacent ridge, and each ground wire is applied thickly, or the conductive ink is applied to the surrounding area in a scattered state. ,
There is a problem that the discharge pressure is too weak and each ground wire is finely applied or is not sufficiently applied. However, according to the means described in (5) above, The ink is applied to the surface of the crests where the ejection pressure is weakened, and the ink is applied to the surface of the valleys where the distance is distant by increasing the ejection pressure. Since the ink is applied while moving diagonally with respect to the line that forms the groove and the valley, a uniform conductive pattern is applied to the surface of the molding filter having irregularities with a uniform application state and no variation in the conductive resistance. Allows to form.

As described above, the above (1)-
The technical problems described above can be solved by the means described in (5), and the problems of the conventional technology can be solved.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the above-described method for forming a conductive pattern for an antistatic filter and a molding filter according to the present invention and an apparatus therefor will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view showing the entire conductive pattern forming apparatus for a molding filter according to the present invention.
Reference numeral 1 denotes a table on which a molding filter F'where the peak portions FA ... And the valley portions FB ... Are alternately formed is placed, 2 is an X-direction screw shaft rotated by an X-direction drive motor 2M, and 3 is a nut portion 3a at the upper end. Is attached to the X-direction screw shaft 2, and the carriage 4 configured to be movable in the X direction (left and right in the drawing) on the table 1 according to the rotation of the X-direction screw shaft 2 is arranged along the longitudinal direction of the carriage 3. Attached to rotate freely
Directional screw shafts 4M are Y-direction drive motors that rotate the Y-direction screw shaft 4.

Reference numeral 5 denotes an ink applicator in which the base portion 5a is attached to the Y-direction screw shaft 4, 5T denotes an ink nozzle for ejecting ink (for ink application) formed at the tip of the ink applicator 5, and 6 denotes An unevenness detection sensor such as a proximity sensor for discriminating between the ridge portion FA and the valley portion FB of the molding filter F ′ provided at the ink nozzle 5T, 7 is sent from the ink tank 9T through the hose 8 by the pressure of the ink supply pump 9P. A pressure adjusting valve for adjusting the supply pressure of the incoming conductive ink. The pressure adjusting valve 7 forms the ink from the ink nozzle 5T when the unevenness detecting sensor 6 detects the ridge portion FA of the forming filter F '. The discharge pressure of the conductive ink discharged onto the surface of the filter F ′ is weakened, and conversely, when the unevenness detection sensor 6 detects the valley portion FB as shown in FIG. 4, this discharge pressure is increased. It is configured to.

FIG. 2 is a block diagram for explaining the electrical configuration of the above-described device according to the present invention, which is an interface circuit connected via a bus 12 between the CPU 10 and the memory 11 which form the center of the control section. Reference numeral 13 denotes the drive motors 2M and 4M for the X direction and the Y direction described above, the unevenness detection sensor 6, the pressure adjustment valve 7 and the ink supply pump 9P.
Are connected to each other and each is controlled and operated according to a system program stored in the memory 11.

Further, in the memory 11, the drive motors 2M and 4M in the X and Y directions are coordinate-controlled to move the ink applicator 5 in the XY direction, while the unevenness detection sensor 6 sends the ink. The discharge pressure of the conductive ink from the ink nozzle 5T is adjusted while adjusting the pressure adjusting valve 7 in accordance with the respective detected signals of the peak portion FA and the valley portion FB which are obliquely formed on the filter material surface of the forming filter F ′. A program for applying and forming a conductive pattern PT including a large number of crossed earth lines FR ... Is stored.

The ground wires FR applied and formed by the ink nozzles 5T are the mountain portions F of the molding filter F '.
The coating is formed by inclining it obliquely with respect to the line forming A and the valley portion FB, and it is preferable that the oblique angle α is within 40 ° with respect to the above line judging from the conductive resistance value. On the street.

The oblique angle of each earth line FR, the formation interval of each earth line FR and the number of the formations, and the overall pattern shape are all determined by a program stored in the memory 11. The shape of the conductive pattern PT shown in FIG. 1 and FIG. 3 described below is an example thereof.

In FIG. 3, the conductive pattern forming apparatus for a molding filter F'is used to apply a conductive pattern PT composed of a large number of ground wires FR ... FIG. 4 is a perspective view showing an example of the formed antistatic filter F according to the present invention, and FIG. 4 is an enlarged sectional view showing a part of the antistatic filter F shown in FIG. 3. Therefore, in FIG. 3, FX indicates the mouth of the antistatic filter F.

Since the conductive pattern forming apparatus for the molding filter according to the present invention has the above-described structure, the conductive pattern P which is previously formed by coating the memory 11 with the molding filter F '.
By programming the shape of T, the coating apparatus controls the movement of the ink applicator 5 according to this program as shown in FIG. For example, a conductive pattern PT having a uniform thickness as shown in FIG. 1 may be applied and formed in a substantially mesh shape on the surface to form the antistatic filter F as shown in FIG.

In addition, the ink applicator 5 applies a ground wire FR which is inclined within a range of an angle α40 ° with respect to the line forming the ridge portion FA and the valley portion FB of the forming filter F ′ according to the above program, Further, since the ejection pressure of the conductive ink ejected from the ink nozzle 5T is adjusted to be weak at the peak portion FA and strongly at the valley portion FB, the ink nozzle 5T, that is, the ink applicator 5 is moved at the same speed. On the other hand, a uniform conductive pattern PT having a constant coating state and no variation in the conductive resistance can be coated and formed on the surface of the filter material of the molding filter F ′.

[0032]

As described above, according to the antistatic filter of the present invention, the filter media surface having the peaks and the valleys alternately formed continuously exhibits a uniform antistatic effect with a uniform thickness. It is possible to provide an antistatic filter having a molded filter structure formed by applying a conductive pattern capable of forming a conductive pattern, and according to the conductive pattern forming method for a molded filter and the apparatus thereof according to the present invention, peaks and valleys are alternately continuous. A formed filter structure that can form a conductive pattern of uniform thickness accurately on the filter medium surface of the formed formed filter without slowing down the application speed and has an excellent discharge function with a constant conductive resistance. The antistatic filter can be mass-produced at a relatively low cost.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a conductive pattern forming apparatus for a molding filter according to the present invention.

FIG. 2 is a block diagram illustrating an electrical configuration of the device according to the present invention shown in FIG.

FIG. 3 is a perspective view showing an example of an antistatic filter having a conductive pattern formed by coating according to the present invention.

FIG. 4 is a cross-sectional view showing an enlarged part of the molding filter shown in FIG.

[Explanation of symbols]

F Antistatic Filter F'molding filter FA Yamabe FB Tanibe FR ground wire PT conductive pattern 2M X direction drive motor 4M Y direction drive motor 5 Ink applicator 5T ink nozzle 6 unevenness detection sensor 7 Pressure adjustment valve

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-8-33823 (JP, A) JP-A-5-237983 (JP, A) JP-A-58-47209 (JP, A) JP-A-9- 313834 (JP, A) Actual opening Flat 5-63607 (JP, U) Actual opening Sho 56-172320 (JP, U) Actual opening Sho 47-27430 (JP, U) Actual opening Sho 50-143178 (JP, U) S. 47-2451 (JP, Y1) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B01D 46/50 B01D 39/14 B01D 46/52 B41M 1/40

Claims (5)

(57) [Claims] 1. A line for forming a peak and a valley formed on a filter medium surface of a molding filter in which peaks and valleys are continuously formed by alternately forming a conductive pattern composed of a plurality of ground wires using conductive ink. An antistatic filter characterized by being applied and formed obliquely with respect to. 2. The antistatic filter according to claim 1, wherein the inclination angle α of the conductive pattern formed by coating obliquely with respect to the line forming the peaks and valleys is set within 40 °. 3. Coordinates according to a program in applying and forming a conductive pattern composed of a large number of ground lines by using conductive ink on a filter material surface of a molding filter in which peaks and valleys are continuously formed alternately. A method for forming a conductive pattern for a molding filter, characterized in that the conductive pattern is applied and formed while discharging a fixed amount of conductive ink from an ink nozzle that moves in a vertical and horizontal coordinate system under control. 4. An ink nozzle for coating and forming a conductive pattern of conductive ink on a filter medium surface of a molding filter is obliquely formed with respect to a line forming a peak and a valley of the molding filter by coordinate control by a program. 4. The method for forming a conductive pattern for a molding filter according to claim 3, wherein the conductive pattern is applied and formed in a substantially mesh shape while moving. 5. A plurality of ground wires are formed by discharging conductive ink onto the filter medium surface of the molding filter while moving in an oblique direction with respect to the lines forming the peaks and valleys of the molding filter by coordinate control by a program. A sensor that detects the peaks and troughs of the molding filter in the ink nozzle that is configured to apply and form a conductive pattern consisting of, and if this sensor detects the peaks of the molding filter, weakly adjust the ejection pressure of the conductive ink. Also, the conductive pattern forming apparatus for a molding filter is provided with a discharge pressure adjusting means for strongly adjusting the discharge pressure of the conductive ink when the sensor detects a valley portion.