KR20040107810A - The method and equipment for manufacturing of the electric filter - Google Patents

Abstract

PURPOSE: To provide an apparatus for manufacturing an electrostatic filter and a method for manufacturing thereof, which use an ion shower method that injects large amount of cations and anions generated by a corona discharge into a filtration member using flow of air and passes the injected ions through a high voltage roller to arrange the ions in a right direction. CONSTITUTION: The apparatus comprises an ion shower part and rollers. The ion shower part uniformly generates a corona discharge anode and a corona discharge cathode to evenly inject negative charges and positive charges into an electrostatic filtration member (202). The ion shower part includes HEPA filters (204,212), honeycombs (206,214), a positive discharge electrode (208) and a negative electrode (216). The rollers are disposed on both sides of the electrostatic filtration member. Different polarity of electric field is applied to each of the rollers.

Description

Electrostatic filter manufacturing apparatus and its method {THE METHOD AND EQUIPMENT FOR MANUFACTURING OF THE ELECTRIC FILTER}

The present invention relates to an electrostatic filter manufacturing apparatus and method thereof, and to an apparatus and method for manufacturing a filtration member used for electrostatic filtration having a high quality and maximized collection performance.

The electrostatic filtration member of the present invention is used in an environment industry, an ultra-clean industry, an air conditioning equipment industry, which can be applied to a dustproof mask, a precision industry such as a semiconductor manufacturing process requiring an industrial filter and a clean room, an ultrafine particle removal filtration system, and the like. do.

Generally, a method for manufacturing an electrostatic filtration member includes a method based on heat, a method by frictional charging, a method using light, and a method using corona discharge. As a method, the method by corona discharge is suitable.

As a method of manufacturing an electrostatic filtration member using corona discharge, a method of producing an electrostatic filtration member by performing a charge treatment on the fabric of a filtration member using a wire or plate electrode or corona discharge directly on a fiber drawn during the manufacture of melt-spun fibers. Method of charging, by applying a dielectric film on at least one side of the fabric of the filter member to discharge the corona, by placing an insulating film between the filter fabric and the ground electrode to discharge the corona discharge, by applying heat to the filter fabric The conventional method is known in the related art, a method of charging by light energy, and a method of manufacturing an electrostatic filtration member by pulverizing the film into a very thin and small size and reshaping it into a filter material after charging the film. .

In the apparatus for manufacturing an electrostatic filtration member manufactured using a conventional corona discharge, the discharge portion or the discharge electrode using the shape of the surface and wire, wire and wire, and non-uniform needle shape were used. In the case of the wire shape, the band width of the voltage and current characteristics caused by the increase of the applied voltage and the discharge current for the corona discharge is very small, the operating range is very narrow and the electrical spark is easily generated. Low charging efficiency and there is a risk of physical damage to the filter due to sparks. In addition, the charged electrostatic filter is easily dissipated and cannot obtain sufficient electrostatic filter performance. If the thickness of the fabric material becomes thicker, the charged surface will be charged but the inner surface will not be charged. There is no problem.

Accordingly, an object of the present invention is to introduce a large amount of ions and anions generated due to corona discharge in the manufacture of an electrostatic filter into a filtration member using a flow of clean air, and then pass a high voltage roller to rearrange the implanted ions. The present invention provides an apparatus and a method for manufacturing an electrostatic filter by a shower method.

1A and 1B are cross-sectional views illustrating a cross section of a state in which a partial cross section of an electrostatic filter according to the present invention is charged.

Figure 2 is a cross-sectional view showing an embodiment of the configuration of an electrostatic filter manufacturing apparatus according to the present invention.

3 is a state diagram showing a state in which the electrostatic filter according to the present invention collects dust in the state of the fibrous tissue charged.

<Brief description of symbols for the main parts of the drawings>

200: ion shower 202: electrostatic filtration member

204, 212 HEPA filter 206, 214 honeycomb

208, 216: positive electrode and negative electrode discharge electrode 210, 218: ground electrode

220, 222; Roller

The present invention is a PP (Polypropylene), PE (Polyethylene), PET, such as a non-woven fabric made of melt blown nonwoven fabric, needle punch (Niddle Punch) widely used for dust treatment, water treatment, etc. The present invention relates to an apparatus and a method for manufacturing a high-quality electrostatic filtration member for maximizing the trapping performance of the filter medium by including its own static electricity in the industrial filtration member such as non-woven or woven fabric made of (Polyethylene Terephthalate).

1A and 1B are cross-sectional state diagrams showing a cross section of a state in which an electrostatic filter 202 according to the present invention is charged. The electrostatic filtration member 202 refers to a fiber filtration member in a state in which the electric dipole moment is permanently polarized and the negative and positive charges are separated and aligned on the surface. In other words, the electrostatic filtration member is a member that exists in a state where the charge of positive polarity and the charge of negative polarity are charged.

Figure 2 is a cross-sectional view showing a cross section of an embodiment of the configuration of the electrostatic filter manufacturing apparatus according to the present invention. Referring to Figure 2 will be described a process for producing such an electrostatic filtration member 202.

In order to electrically charge the resin-impregnated wool filtration member, that is, the electrostatic filtration member 202, electric charges are injected into the corona discharged charges using an ion shower method. Such an ion shower includes HEPA filters 204 and 212 and honeycombs 206 and 214 on the positive electrode side, discharge electrodes 208 and 216 on the positive and negative electrodes for generating corona discharge, and ground electrodes 210 and 218 respectively. It is composed. Such an apparatus for the ion shower is present on both sides of the electrostatic filtration member 202.

The resin-impregnated wool filtration member passes through the ion shower unit 200. The HEPA filters 204 and 212 of the ion shower unit 200 purify the air injected by the blower (not shown) with clean air. Honeycomb (206, 214; Honeycomb) allows the clean purified air to be injected into the positive or negative discharge electrode with an even density and velocity distribution through HEPA filters (204, 212; High Efficiency Particulate Air). Play a role. The positive electrode or negative electrode discharge electrodes 208 and 216 are needle-shaped electrodes having very even intervals and distributions. In addition, the gaps between the needle electrodes are equally uniform, thereby stabilizing the corona discharge state during the electrostatic treatment of the filter medium, thereby generating more electric charges than the wire-shaped discharge part for the same power consumption. It was made. The positive and negative electrode discharge electrodes 208 and 216 and the ground electrodes 210 and 218 are disposed up and down, respectively, to apply the high DC voltage of the positive electrode to the positive electrode discharge electrode 208 and the high DC voltage of the negative electrode to the negative electrode discharge electrode 216. Respective positive and negative ground electrodes 210 and 218 are grounded. Positive and negative charges are generated in the positive and negative electrode discharge electrodes 208 and 216 at the top and bottom, respectively, by corona discharge. While charge is generated by the corona discharge, air is introduced by the blower, and the introduced air is cleaned by the HEPA filter, and then the air having a uniform velocity distribution while passing through the honeycomb contains the anode discharge electrode 208, the ground electrode 210, and the cathode. The air flowing between the discharge electrode 216 and the ground electrode 210 may be ionized by the charges generated by the discharge electrodes 208 and 216. The positive and negative discharge electrodes 208 and 216, together with the respective ground electrodes 210 and 218, generate corona discharges in uniform and clean air, and the positive and negative charges released by the corona discharges are impregnated wool filtration members, i.e., electrofiltration. It is injected into both side surfaces of the member.

The electrostatic filtration member 202 passes between a pair of rollers 220 and 222 to which a strong electric field is applied, and the positive and negative charges included in the electrostatic filtration member 202 are opposite to each other. It moves in the direction of the electrode, whereby the charges of the filtering element are ordered and polarized.

The electrostatic filtration member injected in this way is in a charged state to some extent, but is not completely polarized because it is not in contact with the discharge electrode, and only a part of the charges are in a charged state. In order to charge the positive and negative charges injected as described above, the rollers are statically arranged by friction with rollers 220 and 222 to which high voltage is applied to the electrostatic filtration member. The upper and lower rollers 220 and 222 are applied with high voltages having opposite polarities, and a very high electric field is applied between the rollers 220 and 222.

3 is a state diagram showing a state in which the electrostatic filter according to the present invention collects dust in the state of the fibrous tissue charged. As shown in FIG. 3, when the electrostatic filtration member 202 has electrical polarity, the negative dust A of the electrostatic filtration member 202 is collected in the positive dust A, and the negative dust B is the electrostatic filtration member. 202 is collected by the positive polarity, and the neutral dust C is collected by the attraction force of the induced electromotive force with the surface of the electrostatic filtration member 202. As such, the electrostatic filtration member 202 of the present invention has a maximum collection performance by attaching almost all dust to the surface of the electrostatic filtration member 202 by electrostatic force or induced electromotive force regardless of the electrical polarity of the dust.

The present invention provides an electrostatic filtration for continuously producing high quality filtration members having high performance collection performance without physical damage to the filtration members while generating a large amount of charges for the same power consumption, thereby reducing the occurrence of electrical sparks. There is an effect of providing a manufacturing apparatus and a manufacturing method of the member.

In addition, since the corona discharge does not directly act on the filtration member, there is no damage to the filtration member due to the corona discharge, and the penetration distribution of ions due to the ion shower is very uniform. There is an effect that can be processed.

Claims (3)

In the electrostatic filter manufacturing apparatus, Both sides of the electrostatic filtration member 202 generate the corona discharge of the positive electrode and the corona discharge of the negative electrode, and cause the corona discharge of the positive electrode and the corona discharge of the negative electrode to be uniformly generated, thereby causing a negative charge on the electrostatic filtration member 202. And an ion shower unit 200 for injecting positive charges evenly; Electrostatic filter manufacturing apparatus characterized in that it comprises a roller 202 is configured on both sides of the electrostatic filtration member 202 passing through the electrostatic filtration member 200, each of which has a strong electric field of different polarity. The method of claim 1, The ion shower unit 200, Respective HEPA filters 204 and 212 on the upper and lower surfaces of the electrostatic filter member for purifying the air injected by the blower (not shown) with clean air; Honeycombs (206, 214) disposed on the upper and lower surfaces of the electrostatic filter member so that the air injected by the blower has an even velocity distribution; Charges generated on the upper side and the lower side of the electrostatic filter member, and the ground electrodes 210 and 218 respectively cause corona discharge, and the air passing through the HEPA filters 204 and 212 and the honeycomb causes corona discharge. Electrostatic filter manufacturing apparatus, characterized in that each of the positive and negative electrode discharge electrode (208, 216) to which the high voltage is applied so as to be injected to both surfaces of the electrostatic filtration member. In the electrostatic filter manufacturing method, Purifying the air injected by the blower (not shown) with clean air by respective HEPA filters (204, 212) on the upper side and the lower side of the electrostatic filter member; Causing honeycombs (206, 214) on the upper side and the lower side of the electrostatic filter member to cause the air injected by the blower to have an even velocity distribution; Each of the positive and negative electrode discharge electrodes 208 and 216 and the ground electrodes 210 and 218 on the upper side and the lower side of the electrostatic filter member and the ground electrodes 210 and 218 generate a corona discharge to the HEPA filter 204 and 212. And allowing the air generated through the honeycomb to be corona discharged and injected into both surfaces of the electrostatic filtration member. Electrostatic filter manufacturing comprising the step of passing through the roller 202 is applied to a strong electric field of different polarity respectively on both sides of the electrostatic filtration member 202 passing through the electrostatic filtration member 200 Way.