JP2011090826A - Method of removing dust and static electricity from electrical insulation sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust removal method capable of efficiently removing dust on an electrical insulation sheet and also removing static electricity. <P>SOLUTION: The method of removing dust and static electricity from an electrical insulation sheet is disclosed. A base made of extra fine fibers is disposed around a grounded core to form each rod-shaped processing member. The extra fine fibers of each rod-shaped processing member is wetted with a solvent having a volume resistivity of ≤10<SP>6</SP>Ω cm. The rod-shaped processing members are disposed oppositely to each other in such a manner as to sandwich the electrical insulation sheet from both sides along the direction of the normal line of the sheet. The rod-shaped processing members are uniformly brought into contact with both sides of the electrical insulation sheet in the direction of the sheet width. While all the solvent in contact with the electrical insulation sheet is electrically connected to the cores, dust attached to the surface of the electrical insulation sheet is wiped off, thereby dust sizes of ≥0.05 μm and ≤500 μm on the electrical insulation sheet can be efficiently removed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to dust removal and charge removal methods for an electrical insulating sheet.

  It is known that a long electrically insulating sheet such as a film is continuously conveyed by a plurality of rolls in a manufacturing process. When a long electrical insulating sheet is conveyed to each process, dust or dust floating in the process (hereinafter referred to as dust) may adhere to the electrical insulating sheet due to the influence of electrostatic force. If the electrical insulating sheet is transported to each process with the dust attached thereto, the dust is caught between the electrical insulating sheet and the transport roll, and the electrical insulating sheet is scratched, which causes a problem. Moreover, when it passes through a defect inspection machine with the dust adhering to an electrically insulating sheet, not only a defect but dust will be detected similarly as a defect. For this reason, it overdetects other than problematic defects, and an accurate inspection cannot be performed. Therefore, it is necessary to remove dust adhering to the surface of the electrical insulating sheet.

  As methods for removing dust and cleaning methods, methods described in Patent Documents 1 to 3 are known.

  As a general method for removing dust adhering to the electrical insulating sheet, there is a method using an adhesive roll disclosed in Patent Document 1.

  FIG. 2 is an implementation configuration diagram of the dust removing device described in Patent Document 1. In FIG.

  In FIG. 2, 26 is an electrically insulating sheet to be conveyed, 21 is a transfer roll, 22 is an adhesive roll, and 23 is a dust removing roll that combines the transfer roll and the adhesive roll. Reference numeral 24 denotes a dry dust remover, and 25 denotes a transport roll.

  The dust removal method described in Patent Document 1 rotates a pair of dust removal rolls 23 including a transfer roll 21 capable of capturing dust and an adhesive roll 22 that rotates in opposite directions while being in line contact with the transfer roll 21. In this method, the surface of the transfer roll 21 is brought into contact with the electrically insulating sheet 26 to be transported, and dust adhering to the surface of the electrically insulating sheet 26 is removed.

  In this method, the adhesiveness of the transfer roll 21 greatly affects the dust removal performance. When the transfer roll 21 having an appropriate adhesive force is used, this method is an effective dust removal method.

  However, according to the knowledge of the inventors, when the adhesive force of the transfer roll 21 is weak, dust cannot be supplemented and effective dust removal cannot be performed.

  Further, when the adhesive strength of the transfer roll 21 is strong, the adhesive on the surface of the transfer roll 21 may be transferred to the electrical insulating sheet 26 and the surface of the electrical insulating sheet 26 may be soiled. Therefore, the adhesiveness of the transfer roll 21 must be selected according to the type of the electrical insulating sheet 26, and this selection is difficult.

  Furthermore, when the surface of the transfer roll 21 becomes dirty due to long-term use, there arises a problem that the dirt is transferred to the electrical insulating sheet 26. Further, when the surface of the transport roll 25 existing on the opposite side of the transfer roll 21 is soiled with the electrical insulating sheet 26 in between, the problem that the soil is transferred to the electrical insulating sheet similarly occurs.

  In this method, static electricity is generated when the electrical insulating sheet 26 and the dust removing roll 23 come into contact with each other, and the electrical insulating sheet 26 is charged. For this reason, even if the dust is removed by the method of Patent Document 1, the problem is that the dust floating during the subsequent transport adheres to the electrical insulating sheet 26 again.

  Further, Patent Document 2 discloses a method for removing dust adhering to an electrical insulating sheet by bringing a wipe cloth into contact with the electrical insulating sheet.

  The method described in Patent Document 2 will be described with reference to FIG. FIG. 3 shows an implementation configuration diagram of the dust removing apparatus described in Patent Document 2. As shown in FIG.

  In FIG. 3, 31 is a wiping cloth unwinding roll, 32 is a wiping cloth winding roll, 33 is a wiping cloth, and 34 is a pressing member (tube, plate, blower). Reference numeral 35 denotes each gear, and reference numeral 36 denotes an ionizer for neutralizing the surface of the electrically insulating sheet 26.

  In the dust removal method described in Patent Document 2, a wiping cloth 33 and a pressing member 34 that presses the wiping cloth 33 against the electric insulating sheet 26 are installed vertically on the surface of the electric insulating sheet 26. At the same time, the wiping cloth 33 is brought into contact with the electrical insulating sheet to remove dust adhering to the electrical insulating sheet 26.

  The upper and lower wiping cloths 33 of the electrically insulating sheet are connected to the wiping cloth unwinding roll 31 and the wiping cloth unwinding roll 32, and the wiping cloth 33 is wiped from the wiping cloth unwinding roll 31 by the gear 35. It is conveyed to the take-up take-up roll 32. Accordingly, the surface of the wiping cloth 33 that is in contact with the electrical insulating sheet 26 is always a new cloth, and it is possible to prevent the dust adsorbed by the wiping cloth 33 from reattaching to the electrical insulating sheet 26. .

  However, according to the knowledge of the inventors, in the method described in Patent Document 2, since the wiping cloth 33 is moved from the wiping cloth unwinding roll 31 to the wiping cloth winding roll 32, the wiping cloth 33 is Although it is always new and dust does not reattach to the electrical insulating sheet 26, when the wipe 33 is brought into contact with the electrical insulating sheet 26, a large electrostatic force is generated, and the electrical insulating sheet 26 is charged. The problem of end up occurs. When the electrically insulating sheet 26 is charged, dust existing around the electrically insulating sheet 26 is attracted to the electrically insulating sheet 26, and dust reattaches.

  Therefore, it is necessary to install a static eliminator separately from the dust eliminator, which makes the device complicated and expensive, and requires a large space as an installation location.

  As a method for removing dust adhering to the circuit material on the side portion of the single substrate, there is a method described in Patent Document 3.

  The dust removal method described in Patent Document 3 will be described with reference to FIG.

  FIG. 4 shows an implementation configuration diagram of the dust removing apparatus described in Patent Document 3.

  In FIG. 4, reference numeral 41 denotes a substrate, 42 denotes a cleaning member, 43 denotes a supply reel, 44 denotes a take-up reel, and 45 denotes vertical drive means (cylinder). Reference numeral 46 denotes a nozzle, and 47 denotes a solvent supply tube.

  The method described in Patent Document 3 is a cleaning method for cleaning a plurality of terminals provided at predetermined intervals on the upper surface of the side portion of the substrate 41 with respect to the longitudinal direction of the side portion. A step of supplying a cleaning solvent from a nozzle 46 to a cleaning member 42 having a width equal to or greater than the length of the side portion of 41, and a side of the substrate 41 on which the cleaning member 42 supplied with the solvent is provided. The terminal is connected to the cleaning member 42 and the substrate 41 in a state where the pressing member 34 is pressed by the vertical driving means 45 over the entire length of the upper surface of the side portion and the cleaning member 42 is pressed against the upper surface of the side portion of the substrate 41. A substrate dust removal method comprising a step of moving the supply reel 43 and the take-up reel 44 relative to each other in a horizontal direction intersecting a direction arranged at intervals.

  In the dust removal method of Patent Document 3, the cleaning member 42 in which the solvent supplied from the nozzle 46 is immersed is pressed against the side portion of the substrate 41 simultaneously by the vertical drive means 45, so that the substrate 41 It is possible to remove dust in the complicated circuit pattern on the side portion 41.

  Further, since the cleaning member 42 is always replaced with a new one by the supply reel 43 and the take-up reel 44, it is possible to remove dust without transferring the dirt on the cleaning member 42 to the side portion of the substrate 41. In addition, since the dust removal target is a circuit pattern on the side portion of the substrate, that is, conductivity, it is not necessary to consider neutralization and dust can be removed.

  However, according to the knowledge of the inventors, the method described in Patent Document 3 relates to a dust removal method attached to a single-wafer conductive substrate, and the substrate does not become charged and needs to be neutralized. Therefore, there is no disclosure about the technical idea of static elimination.

  As described above, when removing dust adhering to the electrically insulating sheet that is continuously conveyed, the reattachment of dust due to electrostatic force has been a problem. Furthermore, when the cleaning cloth is brought into contact with the electrical insulating sheet, it has been a problem to generate scratches and uneven wiping of the solvent.

JP 2000-288483 A Japanese Patent Publication No.55-28750 JP2009-95693A

  An object of the present invention is to remove dust adhering to an electrically insulating sheet that is continuously conveyed without causing scratches or wiping unevenness on the electrically insulating sheet by a simple method, and to reattach dust. An object of the present invention is to provide a method for removing dust from an electrically insulating sheet that can simultaneously remove static electricity from the electrostatic force.

In order to achieve the above object, the present invention provides a method for removing dust and removing electricity from an electrically insulating sheet, comprising a substrate made of ultrafine fibers around a grounded cored bar to form a rod-shaped processing member, A solvent having a volume resistivity of 10 ⁶ Ω · cm or less is moistened on the ultrafine fibers of the rod-shaped processing member, and the rod-shaped processing members are arranged to face each other so as to be sandwiched from both sides in the normal direction of the electrical insulating sheet. In the state where the rod-shaped processing member is uniformly contacted with respect to the sheet width direction simultaneously from both sides of the sheet, and all of the solvent in contact with the electrical insulating sheet is electrically connected to the core metal, the electrical insulating property Provided is a method for removing dust and removing electricity from an electrically insulating sheet, wherein the dust adhered to the sheet surface is wiped off.

According to another aspect of the present invention, there is provided a method for removing dust and removing electricity from an electrically insulating sheet, wherein a first base material made of ultrafine fibers is disposed around a grounded first core metal. A rod-shaped processing member is used, the solvent having a volume resistivity of 10 ⁶ Ω · cm or less is wetted on the ultrafine fibers of the first rod-shaped processing member, and the first rod-shaped processing member is aligned in the normal direction of the electrical insulating sheet. All of the solvent in contact with the electrical insulating sheet is disposed so as to be sandwiched from both sides, and the first rod-shaped processing member is uniformly contacted with respect to the sheet width direction simultaneously from both sides of the electrical insulating sheet. And the first cored bar are electrically connected, and a base material made of ultrafine fibers is disposed around the second cored bar to form a second bar-shaped processing member, and the insulating property of the first bar-shaped processing member The second bar-shaped processing member is electrically insulated on the downstream side in the sheet conveying direction. The second rod-shaped processing member is disposed so as to be sandwiched from both sides in the normal direction of the insulating sheet, and the second rod-shaped processing member is simultaneously contacted from both sides of the electrically insulating sheet simultaneously with respect to the width direction of the electrically insulating sheet. The solvent is uniformly applied to both surfaces of the insulating sheet between the first rod-shaped processing member and the second rod-shaped processing member, and the solvent on the electrical insulating sheet at the position of the second rod-shaped processing member The present invention provides a sheet dust removal and charge removal method characterized by wiping all of the sheet.

  Further, according to a preferred embodiment of the present invention, an interval in the conveyance direction of the electrically insulating sheet between the first rod-shaped processing member and the second rod-shaped processing member is 1 cm or more and 1 m or less. Provided is a method for removing dust and removing electricity from a sheet.

  According to a preferred embodiment of the present invention, there is provided a method for removing dust and removing electricity from a sheet, wherein the diameter of the ultrafine fiber serving as the substrate is 0.1 μm or more and 10 μm or less.

Further, according to a preferred embodiment of the present invention, there is provided a method for removing dust and removing electricity from a sheet, wherein the solvent having a volume resistivity of 10 ⁶ Ω · cm or less is water, ethanol, or acetone.

Further, according to a preferred embodiment of the present invention, the wet amount of the solvent having a volume resistivity of 10 ⁶ Ω · cm or less onto the substrate surface made of the ultrafine fibers is 500 g / m ³ or more. Provide a dust removal and charge removal method for a sheet.

  According to a preferred embodiment of the present invention, there is provided a dust removal and charge removal method for a sheet, wherein the size of dust to be removed is 0.5 μm or more and 500 μm or less.

  Moreover, according to the preferable form of this invention, after processing a sheet | seat using the said dust removal and static elimination method, the sheet | seat inspection method characterized by performing a sheet | seat inspection is provided.

  Moreover, according to the preferable form of this invention, the manufacturing method of the sheet | seat using the said dust removal and static elimination method is provided.

  According to the present invention, as described below, the production of an electrically insulating sheet continuously conveyed by a plurality of rolls relates to the generation of scratches and foreign matter caused by dust adhering to the electrically insulating sheet. In addition to resolving the problem of intrusion, it is possible to prevent the reattachment of dust by removing the electrostatic force at the same time.

It is the schematic which shows the dust removal apparatus structure in one Embodiment of this invention. It is the implementation block diagram of patent document 1. FIG. It is an implementation block diagram of patent document 2. FIG. It is an implementation block diagram of patent document 3. FIG. It is a schematic diagram showing the mode of the electric charge on the surface of the electrical insulation sheet in one embodiment of the present invention. It is a schematic diagram in case the surface of the electrically insulating sheet in one Embodiment of this invention is electrically charged. It is the schematic which shows the dust removal apparatus structure in another one Embodiment of this invention. It is the schematic which shows the dust removal apparatus structure at the time of equip | providing the polar solvent supply nozzle in one Embodiment of this invention. It is the schematic which shows the dust removal apparatus structure at the time of equip | providing the polar solvent supply nozzle in one Embodiment of this invention.

  Hereinafter, an example of the best embodiment of the present invention will be described with reference to the drawings, taking as an example a case where the present invention is applied to a dust removal device for an electrically insulating sheet that is continuously conveyed.

  FIG. 1 is a schematic cross-sectional view of a dust removing device for an electrically insulating sheet.

  The dust removing device for an electrical insulating sheet in FIG. 1 includes a first bar-shaped processing unit 8 and a second bar-shaped processing unit 9.

In the first bar-shaped processing unit 8, the first bar-shaped processing member 3 is installed to face both surfaces of the electrical insulating sheet 4. The first rod-shaped processing member 3 is configured by winding a fabric 1 made of wet ultrafine fibers around the first cored bar 2 two or more times. The fabric 1 made of the ultrafine fibers is wetted with a polar solvent having a volume resistivity of 10 ⁶ Ω · cm or less by 500 g / m ³ or more.

  The second bar-shaped processing unit 9 sandwiches the second bar-shaped processing member 12 from both sides in the normal direction of the electric insulating sheet 4 on the downstream side in the transport direction of the electric insulating sheet 4 of the first bar-shaped processing member 8. Are arranged opposite to each other. Further, the second rod-shaped processing member 12 is configured by winding the fabric 10 made of ultrafine fibers around the second core metal 11 two or more times. A polar solvent is not wetted on the fabric 10 made of the ultrafine fibers.

  Further, the first rod-like processing portion 8 and the second rod-like processing portion 9 in the present invention are arranged so that the rod-like processing member integrated with the pressing means sandwiches the electrical insulating sheet 4 from both sides in the normal direction. In addition, it is preferable that the amount of deviation between the pair of rod-shaped processing members sandwiching the electrical insulating sheet is 3 mm or less because the electrical insulating sheet can be uniformly discharged.

In the present invention, the “electrically insulating sheet” refers to a sheet that has a volume resistivity of 10 ¹⁰ [Ω · cm] or more and is difficult to conduct electricity.

  Typical examples of the electrically insulating sheet to which the present invention is applied include sheets of plastic film, fabric, paper, etc., but polyethylene terephthalate film, polyethylene naphthalate film, polypropylene film, polystyrene film, polycarbonate film, Plastic films such as a polyimide film, a polyphenylene sulfide film, a nylon film, an aramid film, and a polyethylene film are particularly suitable for applying the present invention because of high electrical insulation.

  Moreover, the front and back both surfaces of an electrical insulating sheet are electrically charged by contacting the some roll with the electrical insulating sheet which is the dust removal object of this invention. The electrostatic force of this charge collects dust and dirt in the air and adheres to the electrically insulating sheet. In the present invention, the dust of 0.5 μm or more and 500 μm or less adhering to the electrical insulating sheet is to be removed.

  In the present specification, “electrostatic force” refers to “charging of a sheet” derived from an electrostatic charge generated by a frictional charging phenomenon when the electrically insulating sheet comes into contact with a support or a gripping roll. The electrostatic insulating sheet has a static charge that does not change with time and is charged.

In the present invention, the “polar solvent having a volume resistivity of 10 ⁶ Ω · cm or less” is a liquid, and the volume resistivity [Ω · cm] of the liquid is 10 ⁶ Ω · cm or less. Say.

  The volume resistivity measurement method is expressed by the electric resistance between both surfaces when a liquid solvent is filled in a cube having one side of 1 cm and a voltage is applied between the opposite surfaces. Actually, it is measured by applying a DC voltage using a cylindrical electrode. A liquid to be measured (solvent) is put into a cylindrical electrode having an inner cylinder electrode inside the outer cylinder electrode, a DC voltage of 10 V is applied between the outer cylinder electrode and the inner cylinder electrode, and the resistance value Rv [Ω at that time ] Is obtained. At the inner cylinder radius r1 [cm], outer cylinder radius r2 [cm], and electrode effective length L [cm], the volume resistivity: ρv [Ω · cm] is Rv · (2πL) / (ln (r2 / R1)).

Examples of the polar solvent 5 used in the present invention include solvents such as water and alcohol. The additive may be uniformly dispersed in a solvent so as to obtain a predetermined volume resistivity such as an electrically conductive substance, and the volume resistivity may be 10 ⁶ [Ω · cm] or less. In addition, the use of water is preferable because the treatment becomes easier than when other solvents are used.
Further, the cloth made of ultrafine fibers used in the present invention is a wiping cloth made of a cloth that is a knitted fiber having a fiber diameter of 0.1 μm to 10 μm. Furthermore, in order not to generate the wiping residue of the polar solvent 5, the water absorption speed of the fabric made of ultrafine fibers used in the present invention is preferably 100 mm / 10 min or more. By setting the water absorption rate to 100 mm / 10 min or more, the polar solvent can be uniformly wiped and the charge can be eliminated even when the conveying speed of the electrically insulating sheet is increased. In the present invention, the water absorption rate refers to the water absorption rate measured by the Pyreck method described in JIS L1907 (2004).

Furthermore, it is preferable that the amount of dust generation of the fabric made of the ultrafine fibers used in the present invention is 3530 pieces / m ³ or less (100 pieces / 1 CF or less). The dust generation amount of the present invention refers to a value obtained by measurement with a particle counter using a square sample having a side of 24 cm according to the tumbler method according to IES-PR-CC-003-87-T defined by the American Environmental Science Association. .

  Furthermore, the thickness of the fabric made of ultrafine fibers used in the present invention is preferably 500 μm or more. By setting the thickness to 500 μm or more, dust can be wrapped in the cloth made of ultrafine fibers, and the possibility of scratching the electrically insulating sheet surface is reduced. Furthermore, the possibility of redeposition of dust on the electrically insulating sheet is also reduced. In addition, the thickness as used in the field of this invention is an apparent thickness including the space | gap contained in the inside of a fabric.

  Moreover, the 1st metal core 2 and the 2nd metal core 11 used for this invention are rod-shaped base materials which make the width direction of the electrical insulating sheet 4 a longitudinal direction, and the width direction of an electrical insulating sheet and It is installed to be parallel. Furthermore, the first metal core 2 and the second metal core 11 are integrated with pressing means for sandwiching the electric insulating sheet 4 from both sides at the same time, and are grounded rod-like base materials such as aluminum or iron. A metal such as is used.

  Further, the size of the first metal core 2 and the second metal core 11 in the direction of conveying the electrically insulating sheet is 10 mm or more and less than 100 mm, so that dust and wiping unevenness do not flow out to the lower process. This is preferable because it enables efficient dust removal and charge removal.

The pressure applied to the electrically insulating sheet 4 by the grounded bar-shaped processing member integrated with the pressing means used in the present invention is 0.5 kg / m ² or more and 1 kg / m ² or less, so that no scratch is generated. It is preferable because there is no wiping off of dust and polar solvents.

  As one form of grounding in the present invention, a rod-like processing member integrated with the pressing means is attached to a metal frame by a bearing or a housing, and the metal frame is electrically connected to a grounding point such as a building. It is connected. As described above, the grounding in the present invention means that the resistance value between the rod-like processing member and the metal frame is 10 V or less when measured by a tester.

  In addition, since not only the first bar-shaped processing unit but also the second bar-shaped processing unit is grounded, it is possible to eliminate static electricity even when a position where the first bar-shaped processing unit cannot conduct is generated, it is preferable. .

  In addition, the contact surface of the rod-shaped processing member used in the present invention with the surface of the electrical insulating sheet 4 prevents uneven application of the polar solvent to the electrical insulating sheet 4 in the first rod-shaped processing portion 8 and the generation of scratches. In order to prevent wiping of the polar solvent in the second rod-shaped processing unit 9 and the generation of scratches, the surface of the electrically insulating sheet 4 is made parallel.

  Further, by increasing the number of windings of the fabric 1 made of ultrafine fibers wound around the first core metal 2 and the number of times of winding of the fabric 10 made of ultrafine fibers wound around the second core metal 11 used in the present invention, It is possible to soften the contact with the insulating sheet 4 and to prevent generation of scratches. For this reason, the number of windings of the fabric made of ultrafine fibers around the first core metal 2 and the second core metal 11 is preferably 2 times or more, and more preferably 10 times or more.

  Moreover, the same effect can be obtained by winding a member having high water retention and elasticity around the surfaces of the first core 2 and the second core 11 and winding a fabric made of ultrafine fibers around the surfaces. Can do.

  In addition, the fabric made of ultrafine fibers wound around the first core metal 2 and the second core metal 11 used in the present invention can be easily obtained by peeling the fabric from the core metal once when the fabric surface becomes dirty. New fabrics can be obtained. It is preferable that the time for replacing the fabric is shorter, because it is possible to prevent the reflow of dust attached to the fabric made of ultrafine fibers. Therefore, it is preferable to peel off the fabric made of ultrafine fibers at least once an hour.

  In addition, the distance between the first rod-shaped processing unit 8 and the second rod-shaped processing unit 9 in the conveying direction of the electrically insulating sheet 4 in the present invention is 1 cm or more and 1 m or less. The polar solvent 5 is uniformly applied to the electric insulating sheet between the first bar-shaped processing unit 8 and the second bar-shaped processing unit 9 as the interval in the conveying direction of the electric insulating sheet 4 of the bar-shaped processing unit 9 is shorter. Since it becomes easy to do, it is preferable.

As a dust removal method for the electrically insulating sheet 4 that is continuously conveyed, the inventors arrange a fabric 1 made of ultrafine fibers around the grounded first metal core 2 to form a first rod-like shape. As the treatment member 3, the solvent having a volume resistivity of 10 ⁶ Ω · cm or less is wetted on the cloth 1 made of the ultrafine fibers of the first rod-like treatment member 3, and the first rod-like treatment member 3 is electrically insulated. The sheet 4 is disposed so as to be sandwiched from both sides in the normal direction of the sheet 4, and the first rod-shaped processing member 3 is brought into contact with both sides of the electrically insulating sheet 4 at the same time in the sheet width direction, thereby All of the polar solvent in contact with the sheet 4 and the first cored bar 2 are electrically connected, and a fabric 10 made of ultrafine fibers is disposed around the second cored bar 11 to provide a second rod-shaped processing member. 12 and the electrically insulating sheet 4 of the first rod-like processing member 3. The second rod-like processing member 12 is disposed opposite to the downstream side in the conveying direction so as to be sandwiched from both sides in the normal direction of the electric insulating sheet 4, and the electric insulating sheet is simultaneously applied from both surfaces of the electric insulating sheet 4. The second bar-shaped processing member 12 is brought into contact uniformly with respect to the width direction, and the solvent is evenly distributed on both surfaces of the insulating sheet between the first bar-shaped processing member 3 and the second bar-shaped processing member 12. And wipes off all of the polar solvent 5 on the electrical insulating sheet 4 at the position of the second rod-shaped processing member 12. Efficient charging due to dust and electrostatic force adhering to the electrical insulating sheet 4 It was found that the surface of the electrically insulating sheet 4 can be prevented from being scratched.

  When the electrically insulating sheet is wiped with the fabric 10 made of dried ultrafine fibers used in the second rod-shaped processing unit 9 of the present invention, the electrically insulating sheet is charged. However, in the present invention, when the cloth made of ultrafine fibers is used for the rod-like treatment portion, when the solvent touches the second rod-like treatment portion 9 even a little, the entire cloth made of the ultrafine fibers is instantaneously caused by capillary action. Moistened. For this reason, the entire contact surface of the cloth made of the electrically insulating sheet and the ultrafine fibers is wetted by the solvent, so that uniform charge removal can be performed in the second rod-shaped processing section.

  In the present invention, in order to neutralize the electrostatic charge on the surface of the electrically insulating sheet 4, it is necessary to apply a solvent uniformly to the sheet surface and dry it while being electrically grounded. For this purpose, it is necessary to induce the charge of reverse polarity corresponding to the electrostatic charge almost simultaneously in time until the moment when the liquid comes into contact or the moment when the liquid leaves the sheet.

Temporal induction time is related to an attenuation constant, which is a product of resistance and capacitance. In order for the electrostatic charge of the electrical insulating sheet to be neutralized instantaneously, the volume resistivity needs to be reduced to 10 ⁶ [Ω · cm] or less. If the volume resistivity exceeds 10 ⁶ [Ω · cm], there will be a time delay during contact and peeling, and neutralization will not be possible, and contact and peeling such as when the sheet is conveyed at high speed will be performed in a very short time. In such a case, unevenness of electrostatic charge is generated in the electrically insulating sheet. Therefore, it is preferable to use a polar solvent having a volume resistivity of 10 ⁶ [Ω · cm] or less.

A method for neutralizing the electrostatic charge existing on the surface of the electrically insulating sheet with a liquid having a volume resistivity of 10 ⁶ [Ω · cm] or less according to the present invention will be described.

  When the solvent is moistened, the electrostatic charge existing on each surface of the electrically insulating sheet is instantly neutralized by the equivalent amount of charge of opposite polarity. At this time, an equal amount of induced charges of opposite polarity are generated at the electrostatic charge locations of the sheet, so that positive and negative or negative and positive are balanced and neutralized. In this method, the solvent is dried while maintaining a state where positive and negative or negative and positive are balanced, that is, while maintaining an electrically grounded state. Drying while maintaining an electrical grounding condition is achieved by drying the solvent so that a wave is gradually drawn from its outermost edge in an electrostatically conductive state where the solvent is connected to one. it can.

  Next, a static elimination method for simultaneously neutralizing from both sides in the state of the present invention will be described with reference to FIG. FIG. 5 is a simulation diagram of the state of charge on the surface of the electrically insulating sheet 4.

  On the surface of the electrically insulating sheet 4 before the dust removing device, the electrically insulating sheet is charged with a positive (or negative) charge by coming into contact with a plurality of rolls. In these, electrostatic charges existing on the upper surface and the lower surface exist independently. The electrostatic charges on the upper surface and the lower surface of the electrical insulating sheet 4 are compensated for the electrostatic charges having opposite polarities from the upper and lower bar-shaped processing members of the first bar-shaped processing unit 8, respectively. When processing is performed on only one of the surfaces, for example, when only the upper surface of the electrical insulating sheet 4 is processed by the upper bar-shaped processing member of the first bar-shaped processing unit 8, Inductive charges are formed so as to neutralize both the upper surface charge and the lower surface charge. Therefore, if the polar solvent 5 is wiped off in the second rod-shaped processing unit 9 in this state and the electrostatic charge is neutralized, the total of the electrostatic charges on the upper and lower surfaces of the electrical insulating sheet 4 is only zero. Thus, an electrostatic charge is present on each surface in an unbalanced state. By carrying out the treatment from both sides simultaneously, the charge is induced just by the amount corresponding to the amount of electrostatic charge existing on each side of the electrically insulating sheet, and the electrostatic charge on each side is dried by being electrically grounded. Can be well balanced.

  In the static elimination method of the present invention, it is important to uniformly apply both surfaces of the electrical insulating sheet 4 in the first bar-shaped processing unit 8. In the first bar-shaped processing unit 8, uniform application to both surfaces of the electrical insulating sheet 4 is important. On the contrary, when the coating is not performed, the electrical insulating sheet 4 is charged.

  FIG. 6 shows a schematic diagram when the electrically insulating sheet 4 is charged.

  As shown in FIG. 6, in the first rod-shaped processing unit 8, the uniform application to the electrical insulating sheet 4 is not completed, and in the state where coating unevenness occurs, the second rod-shaped processing unit 9 performs electrical insulation. When the conductive sheet 4 and the rod-shaped processing member 12 are brought into contact with each other, since the polar solvent 5 is not wetted on the electrically insulating sheet 4, conduction with the second cored bar 10 cannot be obtained and reverse polarity charges are generated. Therefore, neutralization is not performed. In addition, since it is not wetted with the polar solvent 5, a strong electrostatic force is generated on the contact surface between the electrical insulating sheet 4 and the second rod-like processing unit 9, and the electric charge is reversed.

  Therefore, the application of the polar solvent 5 to the electrical insulating sheet in the first rod-shaped processing unit 8 is uniformly performed so that a dry place is not generated without applying the polar solvent to both surfaces of the electrical insulating sheet 4. It is necessary to apply.

  As a method of uniformly applying the polar solvent 5 to the electrical insulating sheet 4 by the first rod-shaped processing unit 8, the wet amount in the width direction of the fabric 1 made of ultrafine fibers is made uniform, and the electrical insulating sheet surface; It is necessary to make the contact surface with the electrically insulating sheet surface of the fabric made of ultrafine fibers wound around the first cored bar 2 installed above and below in parallel and press the entire width uniformly. Therefore, when the ultrafine fibers wetted with the polar solvent wound around the first core metal 2 are sandwiched uniformly from above and below the electrical insulating sheet 4, the pressing amount is adjusted uniformly in the width direction of the first core metal 2. For this reason, it is preferable to arrange the push bolts at equal intervals in the width direction of the first cored bar 2 and adjust the pressing amount by the tightening amount of the push bolt. In addition, as the distance between the push bolts is made finer, it becomes possible to adjust the amount of pressing that is uniform in the width direction of the second metal core 2.

  In order to surely wipe off the polar solvent 5 applied to the electrical insulating sheet 4 by the second rod-shaped processing section 9, as in the case of the first rod-shaped processing section, the electrical insulating sheet surface and its It is necessary to make the contact surface with the electrically insulating sheet surface of the fabric made of ultrafine fibers wound around the second cored bar 10 installed above and below parallel and press uniformly across the entire width.

  Furthermore, in the static elimination method according to the present invention, it is important to surely wipe off the polar solvent 5 in the second rod-shaped processing unit 9, and when there remains unwiping of the polar solvent 5, the electric charge present in the electrically insulating sheet 4. And the balance of the reverse polarity charge existing in the wiping residue of the polar solvent 5 is lost, and the portion is charged.

  As shown in FIG. 6, when the wiping residue of the polar solvent 5 is generated, reverse polar charges exist in the polar solvent 5 and the electrically insulating sheet 4, respectively. Over time, the polar solvent 5 gradually evaporates leaving a charge, and the polar solvent 5 region shrinks. Due to this contraction, the charge of the polar solvent moves in accordance with the polar solvent that is a conductor. On the other hand, on the surface of the electrically insulating sheet from which the reverse polarity charge has disappeared due to the evaporation of the polar solvent 5, the charge remains as it is and charging occurs.

  Further, since the charges existing on the polar solvent move to the region of the polar solvent contracted by evaporation, the charges are collected in the region. Therefore, since the reverse polarity charge on the surface of the electrical insulating sheet is collected at the position where the polar solvent finally remains, the portion is charged with the reverse polarity on the surface of the electrical insulating sheet.

  As described above, in order to surely remove the electricity from the electrically insulating sheet, the electrically insulating sheet 4 is uniformly applied with the polar solvent 5 in the grounded first rod-shaped processing unit 8, and the second rod-shaped It is necessary to wipe off the polar solvent 5 applied to both surfaces of the electrically insulating sheet uniformly at the front and back at the processing unit 9.

  An example of another embodiment of the present invention will be described with reference to FIG.

In FIG. 7, reference numeral 13 denotes a fabric made of ultrafine fibers moistened with a polar solvent of 500 g / m ³ or more, and is wound around the core metal 14 by two or more turns. Reference numeral 14 denotes a cored bar for winding the fabric made of the ultrafine fibers. Reference numeral 15 denotes a bar-shaped processing member in which a cloth made of ultrafine fibers in which a polar solvent is moistened is wound around the core bar 14, and 16 denotes the bar-shaped processing member 15 from both sides in the normal direction of the electrical insulating sheet 4. It is the rod-shaped processing part arranged so as to be sandwiched. Reference numeral 4 denotes an electrically insulating sheet.
As described above, the dust removing device for the electrically insulating sheet 4 shown in FIG. 7 is in the form of only the first rod-like processing section of the dust removing device for the electrically insulating sheet shown in FIG. In this way, since there is only one bar-shaped processing unit, space is saved and installation is simple.

In the embodiment shown in FIG. 7, a fabric 13 made of ultrafine fibers is disposed around a grounded metal core 14 to form a rod-shaped processing member 15, and the volume resistivity 10 is applied to the fabric made of the ultrafine fibers of the rod-shaped processing member 15. A polar solvent of ⁶ Ω · cm or less is moistened, and the rod-like processing member 15 is disposed oppositely so as to be sandwiched from both sides in the normal direction of the electrical insulating sheet 4. In the state where the rod-shaped processing member 15 is uniformly brought into contact with the sheet width direction, and the core metal 14 is electrically connected to all the polar solvents in contact with the electrical insulating sheet 4, the electrical insulating sheet. By wiping off the dust adhering to the four surfaces, the dust adhering to the electric insulating sheet 4 of the electric insulating sheet and the electrostatic charge can be efficiently removed, and the surface of the electric insulating sheet 4 can be damaged. Departure Can prevent life.

  Moreover, as a method of wetting the polar solvent on the cloth 1 made of the ultrafine fibers of the first rod-shaped processing unit 8, there is a method of previously moistening the polar solvent on the cloth made of the ultrafine fibers. During continuous conveyance, the wet amount changes during conveyance, and a certain dust removal performance may not be ensured. Therefore, as shown in FIGS. 8 and 9, a method of adding an apparatus for supplying a polar solvent at regular intervals is preferable. In addition, the shorter the supply interval, the more uniformly the polar solvent can be wetted in the electrically insulating sheet.

  Here, FIG. 8 shows a dust removing device for an electrically insulating sheet when the polar solvent supply nozzle 6 is installed in front of the cloth made of ultrafine fibers of the first rod-like processing unit 8. The polar solvent supply nozzle 6 needs to be uniformly moistened in the longitudinal direction of the first rod-shaped processing unit 8, and a plurality of polar solvent supply nozzles 6 are installed in the longitudinal direction of the first rod-shaped processing unit 8. . The distance between the polar solvent supply nozzles is preferably 20 cm or less.

  Further, FIG. 9 shows that a polar solvent supply pipe 7 is installed on the first cored bar 2 around which the fabric made of ultrafine fibers of the first bar-shaped processing unit 8 is wound, and the polar solvent is supplied to the first cored bar 2 at regular intervals. This is a dust removing device for an electrically insulating sheet when a nozzle 6 is installed. In the dust removal apparatus for the electrical insulating sheet of FIG. 9 as well, the polar solvent supply nozzle 6 needs to be uniformly moistened in the longitudinal direction of the first bar-shaped processing unit 8 as in FIG. A plurality of polar solvent supply nozzles 6 are installed in the longitudinal direction of 8. The distance between the polar solvent supply nozzles is preferably 20 cm or less.

  By doing in this way, with respect to the electrically insulating sheet | seat 4 conveyed continuously, it becomes possible for the dust removal apparatus of an electrically insulating sheet to maintain fixed dust removal and static elimination performance.

Hereinafter, an example in which the present invention is applied to remove dust adhering to a polyethylene terephthalate film (hereinafter referred to as a film) having a width of 1 m that is continuously conveyed will be described. It is not limited. In addition, as a comparative example, the results when the conditions are changed are shown.
[Example 1]
A dust removing device for a film having the same configuration as that of FIG. 7 was used. “Toraysee (registered trademark, hereinafter simply referred to as Toraysee)” (model: MTK) manufactured by Toray Industries, Ltd. (model: MTK) is used as a fabric made of ultrafine fibers, and a width of 1.50 mm × 50 mm, a 1.5 m long square piece made of aluminum. A 2m tressy was wound 10 times. In addition, ethanol is used as a polar solvent, and a long sponge in the width direction in which 30 g of ethanol has been previously wetted is sandwiched uniformly by a tressy wound around two aluminum square bars. Moistened. A Toraysee wrapped around this aluminum square was sandwiched simultaneously from the top and bottom of the film. Here, the pressure for sandwiching the film from above and below with the core 2 wound with two tresses was measured with a prescale (model “LLLLW”) manufactured by Fuji Film Co., Ltd., and was set to 500 g / m ² .
[Comparative Example 1]
In the film dust remover having the same configuration as in Example 1, both sides of the sheet were wiped off at the same time without grounding the aluminum square material and without conducting ethanol and aluminum square material.
[Example 2]
A dust removing device for a film having the same configuration as in FIG. 1 was used. Toray is used as a fabric made of ultrafine fibers, and as a first rod-shaped processing section, 50 mm × 50 mm, 1.5 m long square steel is wrapped with 10 turns of 1.2 m width of tresy, and 50 g of ethanol as a polar solvent. Was pre-wetted in tressy. Further, as a second bar-shaped processing portion, a 10-lap width of a 1.2 m width was wound around an aluminum square member having a length of 50 mm × 50 mm and a length of 1.5 m. The pressure at which the film was sandwiched from above and below by the core metal around which the tressy was wound in each bar-shaped processing portion was 500 g / m ² . Further, the distance between the first bar-shaped processing section and the second bar-shaped processing section was 50 mm.
[Comparative Example 2]
In the second rod-shaped processing part of the dust removing apparatus for a film having the same structure as in Example 2, the core metal wound with the tressy and the film are not uniformly contacted, there is wiping residue, and the ethanol and the tresy moistened on the film There was a place where there was no conduction.
[Evaluation results]
Dust of 0.5 μm or more and 500 μm or less adhered, and a 1 m wide film charged to +15 kV was continuously conveyed for 50 m at 10 m / min, and the dust removing apparatuses of Examples 1 and 2 and Comparative Examples 1 and 2 were applied. . And the dust removal result of the both surfaces of the film after application of each dust removal apparatus, the static elimination result, a crack generation result, and the wiping result of the solvent were confirmed. Dust removal result, scratch generation result, solvent wiping result, 10m of the film after dust removal is cut off, light is applied to the film with a fluorescent lamp, and scratches, dust and solvent remaining on the film surface are checked, and the static elimination result Trek, Inc. It was measured with a manufactured surface potential meter (model “Model 523-1”). The results are shown in Table 1. Note that “◯” in the dust removal result indicates that a dust removal effect of 80% or more is obtained, and “x” indicates a dust removal effect of less than 80%. In addition, “◯” in the static elimination result indicates that the potential measurement result is within ± 1 kV, and “x” indicates more than that. In the scratch generation result, “◯” indicates that no scratch has occurred, and “×” indicates that a scratch has occurred. In the solvent wiping results, “◯” indicates that the solvent wiping unevenness does not occur, and “x” indicates that the solvent wiping unevenness occurs.

  In Examples 1 and 2, all the dust of 0.5 μm or more and 500 μm or less adhering to the film could be removed, and no scratch was generated. Further, ethanol could be uniformly wiped, and as a result of measuring the charge amount of the film after dust removal, it was confirmed that the film was almost not charged with +0.5 kV.

  Furthermore, after passing through this dust removal apparatus, when passed through an inspection apparatus using a camera and a light source, only scratches generated on the film could be detected. Furthermore, it was possible to improve the film manufacturing method by managing the film manufacturing process based on the inspection result and feeding back the inspection result to the film manufacturing process.

  On the other hand, in Comparative Example 1, it was confirmed that the dust adhered to the film could be removed when ethanol and the aluminum square were not conducted, and no scratch was generated. However, the film was charged at +15 kV and could not be neutralized.

  Further, in Comparative Example 2, the aluminum square member around which the tressy of each bar-shaped processing unit is wound is not uniformly contacted with respect to the film width direction, and there is a place where the wet ethanol and the tressy are not connected to the film. In this case, uneven wiping of ethanol occurred. When the amount of charge was measured, the uniformly wiped portion was able to be neutralized with +0.5 kV, but it was confirmed that the ethanol wiping unevenness portion was charged with +15 kV. Was confirmed to exist.

  The present invention is not limited to a dust removing device for dust generated on the surface of a film that is continuously conveyed, but can be applied to removal of dust generated on the surface of a paper surface. However, the application range is not limited thereto.

1 Fabric made of ultrafine fibers wetted with a polar solvent of 500 g / m ³ or more and wound around the first core 2 or more 2 First core 3 3 First rod-like processing member 4 Electrical insulating sheet 5 Polarity Solvent 6 Polar solvent supply nozzle 7 Polar solvent supply tube 8 First rod-shaped processing section 9 Second rod-shaped processing section 10 Fabric 11 made of ultrafine fibers wound around the second core metal more than once. Second core metal 12 2nd rod-shaped processing member 13 Fabric made of ultrafine fibers wetted with a polar solvent of 500 g / m ³ or more and wound around the core more than 14 core metal 15 Bar-shaped processing member 16 Bar-shaped processing section 21 Transfer roll 22 Adhesive roll 23 dust removal roll 24 dry dust remover 25 transport roll 26 electric insulating sheet 31 wipe cloth unwinding roll 32 wipe cloth winding roll 33 wipe cloth 34 pressing member 35 gear 36 ionizer 41 substrate 42 cleaning member 3 take-up supply reel 44 reel 45 vertical drive means (cylinder)
46 Nozzle 47 Supply tube

Claims (9)

A method for removing dust and removing electricity from an electrically insulating sheet, wherein a base made of ultrafine fibers is arranged around a grounded cored bar to form a rod-shaped processing member, and the volume resistivity of the microfiber of the rod-shaped processing member is 10 ^6. Wet a solvent of Ω · cm or less, and arrange the rod-shaped processing member so as to be sandwiched from both sides in the normal direction of the electrical insulating sheet, and uniformly from both sides of the electrical insulating sheet simultaneously in the sheet width direction The rod-shaped processing member is brought into contact with each other, and dust attached to the surface of the electrically insulating sheet is wiped off in a state where all of the solvent in contact with the electrically insulating sheet and the core metal are electrically connected. Dust removal and charge removal method for electrical insulating sheet. A method for removing dust from and removing electricity from an electrically insulating sheet, wherein a first rod-shaped processing member is provided by disposing a substrate made of ultrafine fibers around a grounded first core metal. The solvent having a volume resistivity of 10 ⁶ Ω · cm or less is moistened in the ultrafine fiber, and the first rod-like processing member is disposed so as to be sandwiched from both sides in the normal direction of the electric insulating sheet, and the electric insulation Contacting the first bar-shaped processing member uniformly with respect to the sheet width direction simultaneously from both sides of the conductive sheet, and electrically connecting all of the solvent in contact with the electrical insulating sheet and the first cored bar, A substrate made of ultrafine fibers is disposed around the second cored bar to form a second rod-shaped processing member, and the second rod-shaped processing member downstream of the first rod-shaped processing member in the conveyance direction of the insulating sheet. The processing member is sandwiched from both sides in the normal direction of the electrical insulating sheet. The second rod-shaped processing member is uniformly contacted with respect to the width direction of the electric insulating sheet simultaneously from both sides of the electric insulating sheet, and the first rod-shaped processing member and the second rod The solvent is uniformly applied to both surfaces of the insulating sheet between the rod-shaped processing members, and all of the solvent on the electrical insulating sheet is wiped off at the position of the second rod-shaped processing member. Sheet dust removal and charge removal methods. 3. The sheet dust removal according to claim 2, wherein an interval between the first rod-shaped processing member and the second rod-shaped processing member in the conveyance direction of the electrically insulating sheet is 1 cm or more and 1 m or less. Static elimination method. The method for removing dust and removing electricity from a sheet according to any one of claims 1 to 3, wherein the diameter of the ultrafine fiber serving as the substrate is 0.1 µm or more and 10 µm or less. 5. The sheet dust removal and charge removal method according to claim 1, wherein the solvent having a volume resistivity of 10 ⁶ Ω · cm or less is water, ethanol, or acetone. 6. The wet amount of the solvent having a volume resistivity of 10 ⁶ Ω · cm or less onto the surface of the substrate made of the ultrafine fibers is 500 g / m ³ or more, according to claim 1. Sheet dust removal and charge removal methods. The dust removal and charge removal method for a sheet according to any one of claims 1 to 6, wherein the size of dust to be removed is 0.5 µm or more and 500 µm or less. A sheet inspection method comprising: inspecting a sheet after processing the sheet using the dust removal method according to claim 1. The manufacturing method of the sheet | seat using the method in any one of Claims 1-8.

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