JP2007115559A - Static charge eliminator of electrical insulation sheet and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method of stably manufacturing an electrical insulation sheet with positive and negative charges balanced on a front and rear faces, respectively, by balancing the positive and negative static charges for a whole face of a moving electrical insulation sheet. <P>SOLUTION: (1) At least one static eliminator SU is of a structure of "an exposed ion-generation electrode" with a first electrode unit EUd and a second electrode unit EUf facing each other, (2) a direct-current and/or alternating current inter-ion generation-electrode potential is applied between a first ion-generating electrode 5d and a second ion-generating 5h, and (3), provided that the total number of the static eliminators SU is n (n is an integer of 2 or more), the potential difference between ion generating electrode at n/4 pieces or more of the static eliminators SU are reverse in polarity to those of another static eliminators SU. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a static eliminator for an electrical insulating sheet and a manufacturing method thereof.

  Charging of an electrically insulating sheet such as a plastic film may hinder desired processing in the process of processing the sheet. As a result, the quality of the processed product may not be as expected. For example, when a printing or coating agent coating process is applied to a sheet with locally strong charge or discharge traces called static marks resulting from electrostatic discharge, the resulting processed product will have uneven ink or coating agent. It will have. In the manufacturing process of metal-coated films for capacitors and packaging, static marks may appear on processed products after film processing such as vacuum deposition or sputtering. Strong charging such as a static mark causes the film to adhere to other members due to electrostatic force, and causes various problems such as poor conveyance, alignment, and poor alignment of the cut sheet.

  In order to avoid such a problem, conventionally, a self-discharge type static eliminator that removes static electricity by causing a grounded brush-like conductor to approach a charged electrically insulating sheet and generate a corona discharge at the tip of the brush, An AC type or DC type voltage application type static eliminator is used that applies a high voltage of commercial frequency or a DC high voltage to an electrode to generate a corona discharge and thereby eliminates static electricity. In these self-discharge type static eliminators and voltage application type static eliminators, ions caused by corona discharge are attracted by the electric field due to the charging of the electrical insulating sheet to neutralize the charge of the electrical insulating sheet (static elimination). is there. Thereby, the potential of the sheet charged at a high potential can be lowered.

  However, in the electrical insulating sheet, the positive and negative charged regions are often mixed at a narrow pitch on one side or both sides of the sheet (due to electrostatic discharge or the like on the sheet). In particular, when both surfaces of the sheet are charged, each surface is often charged with a reverse polarity, which is called “double-sided bipolar charging”. The electric field in the electrically insulating sheet having such a charge is concentrated only inside the sheet (in the thickness direction) or near the surface of the sheet. Therefore, sufficient ions cannot be attracted from the ion generation part of the static eliminator (brush tip or needle tip of the needle electrode) located slightly away from the electrically insulating sheet. Almost no neutralization effect was obtained.

  On the other hand, the sheet neutralization apparatus shown in FIG. 1 and FIG. 2 is characterized in that an AC voltage having an opposite phase is applied to the ion generating electrode and the ion attracting electrode that are spaced apart from each other with the electrically insulating sheet interposed therebetween. 1 and 2 are disclosed (for example, refer to Patent Document 1 and Patent Document 2). According to the static eliminator of Patent Literature 1 and Patent Literature 2, the electric field between the ion generating electrode 1b and the ion attracting electrode 1d and the ion generating electrode are not dependent on the electric field due to the charging of the electrical insulating sheet S. Since the sheet S is forcibly irradiated with the electric field between the electrode 2b and the ion accelerating electrode 2d and the electric field between the ion generating electrode 2f and the ion accelerating electrode 2h, the effect of removing static electricity even in a sheet having a charged pattern Is said to be high.

However, as in the case of the static eliminator 1 shown in FIG. 1 disclosed in Patent Document 1, when the ions are forcibly irradiated from one side of the sheet, the sheet has the polarity of the forcibly irradiated ions. Charging causes the following two problems.
(1) The sheet potential rises to the polarity of the forcibly irradiated ions. Even if the sheet has a charge density of only 1 μC / m ² order, the sheet is transported in the air and is irradiated with ions of one polarity from one side of the sheet. The potential increases with respect to several tens of kV. This is because the larger the distance from the ground structure, the smaller the electrostatic capacity of the sheet, and the higher the potential even at the same charge density. In other words, since the potential (absolute value) increases when only a few ions first reach the sheet by forced irradiation, the sheet can no longer be received even if ions of the same polarity are forcibly irradiated continuously. It is. The potential measured in a state where the sheet is conveyed in the air is hereinafter referred to as an aerial potential. As described above, when the imaginary potential increases, the ions are repelled by the Coulomb force due to the charging of the sheet, and the ions are prevented from reaching the sheet. That is, even if a large amount of ions are generated by the ion generating electrode, it is not possible to irradiate the sheet with sufficient ions. The amount of ions that can be irradiated is only about 1 μC / m ² .
(2) Since an alternating voltage is used, positive and negative unevenness of charging according to the polarity of ions forcibly irradiated occurs in the moving direction of the sheet. In order to remove this unevenness, there are many cases where DC and AC static eliminators 1e and 1f are further required downstream of the static eliminator.

  Moreover, in the static elimination apparatus of patent document 1, ion is irradiated only to the single side | surface (static elimination surface) of a sheet | seat. For this reason, when the sheet is charged on both sides with both polarities, it is not possible to remove (neutralize) the charge existing on the opposite surface (non-charge removal surface) of the charge removal surface. This is because, in an insulating sheet, charges cannot easily move in the thickness direction (although in the in-plane direction). For the part on the sheet where there was a charge on the non-static surface, the non-static surface was kept charged and the non-static surface was charged on the opposite surface (static surface) of the same position in the in-plane direction. , The same amount of reverse polarity ions adhere. This is because the irradiated ions are attracted by the Coulomb force without distinguishing the charges on the front and back surfaces (the charge removal surface and the non-charge removal surface) of the sheet.

  The sheet finally obtained (after using the downstream direct current and alternating current neutralizers 1e and 1f) by the neutralization by the neutralization device of Patent Document 1 is a local area on both sides of the same position in the in-plane direction of the sheet. This is a sheet in a state where the sum of the apparent charge densities (apparent charge density) is substantially zero. However, in actuality, this state is a state in which both surfaces of the same position in the in-plane direction of the electrically insulating sheet are charged with equal amounts and opposite polarities. Such a sheet state is referred to as an “apparent uncharged” state, and such charge removal is referred to as “apparent charge removal”.

  On the other hand, in the static elimination apparatus 2 as shown in FIG. 2 disclosed in Patent Document 2, ions are irradiated from both sides. However, since the static eliminator in Patent Document 2 irradiates ions alternately instead of simultaneously from both sides, in the case of each ion irradiation, as in the case disclosed in Patent Document 1, (1) The problem (2) occurs. Further, due to the problem (1), since the amount of ion irradiation is small, there is almost no ability to reduce the charge on each surface. For this reason, as with the static eliminator disclosed in Patent Document 1, it is almost impossible to remove static electricity beyond the “apparent non-charged” state.

  On the other hand, the first ion generating electrode 3a to which a positive direct current voltage is applied is disposed on one side of the sheet S at a distance from the sheet S, and the second ion generating electrode 3c to which a negative direct current voltage is applied. 3 is disposed on the opposite surface of the sheet S at a distance from the sheet S, and simultaneously irradiates opposite-polarity ions on both surfaces of the sheet S (see, for example, Patent Documents). 3, see.)

  Although not described in Patent Document 3, according to the knowledge of the present inventors, unlike the charge eliminating device 2 disclosed in Patent Document 2, this charge eliminating device 3 irradiates ions of opposite polarity simultaneously from both sides. The problems (1) and (2) are unlikely to occur. That is, in the static elimination apparatus 3 in Patent Document 3, the “imaginary potential” of the sheet does not increase, and the sheet can be sufficiently irradiated with ions. Further, there is no unevenness of positive and negative charging in the sheet moving direction, and it is not necessary to provide a DC and AC static eliminator downstream of the sheet moving direction. However, in the static eliminator 3 disclosed in Patent Document 3, one surface of the sheet S is irradiated with only positive ions and the opposite surface is irradiated with only negative ions. For example, the first surface 100 is negative and the second surface is negative. For the part on the sheet in which the surface 200 is positively charged, a neutralization effect is obtained, but the part on the sheet in which the first surface 100 is positive and the second surface 200 is negatively charged. It is not possible to obtain the effect of eliminating static electricity. Rather, if the polarity of the charge on each surface of the sheet S is the same as the polarity of the ions irradiated on each surface, the charge on each surface may be increased.

  In addition, a pair of ion generating electrodes 4a and 4c to which an alternating voltage of opposite polarity is applied are arranged on both sides of the sheet S at a distance from the sheet S, and the polarity changes simultaneously with time on both sides of the sheet. 4A which discharges | emits the ion of the reverse polarity which is shown to FIG. 4A is disclosed (for example, refer patent document 3 and patent document 4). When AC voltage is used, each of the first surface 100 and the second surface 200 of the sheet seems to be irradiated with positive and negative ions at first glance, but when looking at each part of the moving sheet, The first surface 100 is irradiated with positive ions (the second surface 200 is irradiated with negative ions), and the first surface 100 is irradiated with negative ions (the second surface 200 is exposed to positive ions). The irradiated portion is only periodically repeated in the sheet moving direction. That is, even in an ideal case, each part of the film is only irradiated with ions of one polarity from each surface, and when viewed at each part in the moving direction of the film, any position The charge on the front and back of the film is opposite in polarity, and the `` fictional potential '' is almost zero, but the amount of ions on each side of the front and back of the film is periodically and positively and negatively attached, that is, the film Ion unevenness including the polarity of adhering ions occurs at each site in the moving direction. With this alone, it is not possible to sufficiently neutralize a film with positive and negative charges mixed on each side. It could only be made “uncharged”.

  In Patent Document 3, as a form of the ion generating electrode arranged on each surface of the sheet, a form in which three wire electrodes to which a DC voltage having the same polarity is applied are arranged in parallel to the moving direction of the sheet, or an AC voltage is used. One of these is a wire electrode to which is applied, but all of these only irradiate each part of the film with ions of one polarity from each surface.

  Further, in Patent Document 6, a pair of ion generation electrodes to which an AC voltage having a reverse polarity is applied, as disclosed in Patent Document 3 and Patent Document 4, are arranged at intervals from the sheet S, and both surfaces of the sheet are arranged. At the same time, a device is disclosed in which a plurality of static eliminators 4A that irradiate ions of opposite polarity whose polarity changes over time are arranged side by side in the moving direction of the sheet S. In this case, in each static eliminator, ion adhesion unevenness including the polarity of the adhering ions occurs at each site in the moving direction of the film. Therefore, depending on conditions such as the moving speed of the sheet, the applied voltage and frequency of the AC power supply, and the parallel arrangement interval in the moving direction of the sheets of each static eliminator, as described in Patent Document 6, It is necessary to select the sheet moving speed when using the static eliminator, because uneven adhesion of ions at the site may be increased.

  On the other hand, a pair of ion generation electrodes to which a reverse polarity DC voltage is applied are arranged with two stacked sheets sandwiched between them, and both sides of the sheet are irradiated with opposite polarity ions at the same time, and the sheets are bonded together. An apparatus 4B as shown in FIG. 4B is disclosed (see, for example, Patent Document 5). However, such a laminating apparatus is only intended to charge the respective sheets S1 and S2 with opposite polarities, and no study has been made on the charge removal on each surface (each sheet). It was.

  In such an electrically insulating sheet that is apparently uncharged but charged on each side, the original charged pattern reappears when metal deposition or coating is performed on the sheet during processing. It is known (for example, refer to Patent Document 6).

  For example, when metal vapor deposition, which is a conductive coating process, is performed on such an apparent uncharged film, the surface of the metal vapor deposition film, which is the interface with the film, is reversed against the charge on the vapor deposition surface of the film. A polar charge is induced and the potential at the interface is zero. Since electric charges exist on the non-deposited surface of the film, an electric field is generated near the outer side of the non-deposited surface of the film, resulting in a static mark. In addition, for example, in the case of coating a coating agent, if a conductive roll, a metal roll, is used as a backup roll, coating is performed on this roll. Is induced, and the potential at the contact surface becomes zero. Since there is a charge on the non-contact surface (application surface) of the film, an electric field is generated near the outside of the application surface due to the charge on the application surface, causing uneven coating. As mentioned above, since all of the conventional technologies only perform “apparent charge removal” on the electrical insulating sheet at most, generation of static marks after film processing such as vacuum deposition and sputtering, cut due to poor sliding Problems such as poor alignment of sheets and unevenness of ink and coating agent could not be solved.

In response to such a problem, the present inventors have provided a shield electrode that is disposed in the vicinity of the ion generation electrode and assists corona discharge at the tip of the ion generation electrode by providing an appropriate potential difference with the ion generation electrode. Two or more static elimination units are arranged in the sheet moving direction, and in each static elimination unit, DC voltages having opposite polarities are applied to the first and second ion generating electrodes arranged opposite to each other with the sheet interposed therebetween, thereby moving the sheet. By proposing a static elimination device that applies a DC voltage that applies DC voltages of opposite polarities to the first ion generation electrode of each static elimination unit adjacent in the direction, not only “apparent non-charging”, It has been confirmed that the charge on each surface of the sheet is greatly reduced, and uneven adhesion of ions at each portion of each surface of the sheet can be alleviated regardless of the moving speed of the sheet (Japanese Patent Application No. 2005 by the present applicant). 020932 reference.).
Further, Patent Document 7 compares the ion current required when a constant potential is applied when the DC neutralization device 4C as shown in FIG. 4C is used and when the shield electrode is provided or not. And the results of comparing the static elimination effect are disclosed. In the static eliminator 4C, DC voltages having opposite polarities are applied to the adjacent plus discharge needle 4j and minus discharge needle 4k to generate corona discharge at the tip of each needle. The DC static eliminator 4C described in Patent Document 7 has the ground electrode 4m and the ground electrode 4n in order to stably continue the corona discharge at each needle tip, but there is no ground electrode 4m and ground electrode 4n. It is also disclosed that the amount of ions that reach the static elimination object increases in the initial stage over time. However, when this static eliminator 4C is arranged on one side of the sheet, the amount of ions adhering to the sheet surface is far smaller than when the electrode units having shield electrodes are arranged opposite to each other across the sheet, and the satisfactory static elimination effect is It was not obtained. In addition, since DC voltages having opposite polarities are applied to the adjacent plus discharge needle 4j and the minus discharge needle 4k, there are no ions leaking from the ground electrode 4m and the ground electrode 4n to the ground. When the distance to the discharge needle 4k is small, positive and negative ions generated from each discharge needle are combined and neutralized, and the amount of ions reaching the sheet surface is reduced, so that a satisfactory static elimination effect cannot be obtained. it was thought.
Japanese Patent No. 2651476 JP 2002-31596 A JP 2004-039421 A US Pat. No. 3,475,652 US Pat. No. 3,922,614 US Patent Application No. 00003694 JP 2001-035686 A

  According to the knowledge of the inventors, in the static eliminator described in Japanese Patent Application No. 2005-020932 by the present applicant, a part of the ions generated from each ion generation electrode leaks to the ground via the shield electrode, Since the amount of ions that reach the sheet surface is reduced, in order to obtain a large charge removal effect, it is necessary to arrange a large number of charge removal units in the sheet movement direction, so the charge removal device must be enlarged and the installation space must be selected. there were. At the same time, in the power supply connected to each ion generation electrode, mainly the current corresponding to the amount of ions adhering to the sheet surface and the current corresponding to the amount of ions leaking to the ground via the shield electrode (in other words, contributing to static elimination) Therefore, a high-current output power source is necessary.

  The object of the present invention is to solve the above-mentioned problems of the prior art described above, and at the same time to easily remove the positive and negative charged regions mixed at a narrow pitch on one side or both sides of the electrical insulating sheet. An object of the present invention is to provide a static eliminator that can efficiently supply a large number of ions to both sides of a sheet as compared with the prior art. In particular, a static elimination device and a static elimination method that can be used in a wide speed range are provided.

In order to achieve the above object, a static eliminator for an electrically insulating sheet according to the present invention has the following configuration.

That is, it has at least two static elimination units spaced from each other in the movement direction of the sheet with respect to the movement path of the electrical insulating sheet, and the static elimination units are arranged on the first surface side of the sheet. A first electrode unit disposed; and a second electrode unit disposed on a second surface side of the sheet; wherein the first electrode unit includes a first ion generation electrode; The second electrode unit is a static eliminator for an electrically insulating sheet having a second ion generation electrode disposed opposite to the first ion generation electrode,
(1) The at least one static elimination unit has a configuration in which both the first electrode unit and the second electrode unit are an ion generation electrode exposed type,
(2) In each of the above units, a direct-current and / or alternating-current ion generation electrode potential difference is applied between the first ion generation electrode and the second ion generation electrode.
(3) When the total number of the static elimination units is n (n is an integer of 2 or more), the ion generation in the static elimination units of n / 4 or more (rounded up after the decimal point) out of the n static elimination units. An electrical insulating sheet static eliminator is provided, wherein the inter-electrode potential difference is a potential difference having a polarity opposite to that of the ion generating electrode potential difference in the other static elimination unit.

  According to a preferred embodiment of the present invention, the total number n of the static elimination units is an even number, and the potential difference between the ion generation electrodes in the n / 2 static elimination units is equal to the ion generation electrode in the other static elimination unit. An electrical insulating sheet static eliminator is provided in which the inter-potential difference is a potential difference having a reverse polarity.

  According to a preferred aspect of the present invention, in all the static elimination units, the potential difference between the ion generation electrodes between the static elimination units adjacent in the moving direction of the sheet is a potential difference having opposite polarities. An electrical insulating sheet static eliminator is provided.

  According to a preferred embodiment of the present invention, in at least one set of the static eliminator units adjacent to each other in the moving direction of the sheet, the potential difference between the ion generation electrodes of the at least one set of static eliminator units is opposite to each other. The interval between the static elimination units in the moving direction of the sheet of the at least one set of static elimination units is 0. 0 which is the maximum value of the distance between the normal direction electrodes of the static elimination unit of any one of the at least one set of static elimination units. An electrical insulating sheet static eliminator is provided that is configured to be 8 times or more and 2 times or less.

  According to a preferred embodiment of the present invention, in each of the static elimination units, the first ion generation electrode includes a plurality of first partial electrodes arranged in a width direction of the sheet, The interval between the first partial electrodes arranged adjacent to each other in the width direction of the sheet in the width direction of the sheet is less than 0.8 times the maximum value of the distance between the normal direction electrodes of the static elimination unit. A feature of the neutralizing device for an electrically insulating sheet is provided.

  According to still another preferable aspect of the present invention, the absolute value of the potential difference between the ion generation electrodes of at least the most downstream of the static elimination units in the sheet moving direction among the static elimination units is the ion of the other static elimination unit. An electrical insulating sheet static eliminator is provided that is smaller than the absolute value of the potential difference between the generation electrodes.

  Further, according to a preferred embodiment of the present invention, among the respective static elimination units, at least the distance between the normal direction electrodes of the static elimination unit at the most downstream in the moving direction of the sheet is between the normal direction electrodes of the other static elimination units. There is provided a static elimination device for an electrically insulating sheet, characterized by being larger than the distance.

  According to a preferred embodiment of the present invention, the amount of electrode displacement of at least the most neutralization unit in the moving direction of the sheet is greater than the amount of electrode displacement of other neutralization units. An electrical insulating sheet static eliminator is provided.

  Further, according to a preferred embodiment of the present invention, in each of the static elimination units, in each of the static elimination units, in each of the static elimination units, each ion is generated according to the moving speed of the sheet and / or the thickness of the sheet. An electrical insulating sheet static eliminator having a means for controlling the potential difference between the electrodes is provided.

  Further, according to a preferred embodiment of the present invention, the first ion generation electrode and the second ion generation electrode have a reverse polarity potential in all the static elimination units with respect to a predetermined common potential. An electric discharge device for an electrically insulating sheet is provided.

  Further, according to a preferred embodiment of the present invention, each of the static elimination units includes at least a DC static elimination unit composed of the first ion generation electrode to which a DC potential difference is applied and the second ion generation electrode. A first alternating-current ion generating electrode provided with an alternating-current potential difference, the first alternating-current ion generating electrode disposed opposite to the downstream of the at least one direct-current static elimination unit in the moving direction of the sheet with the sheet interposed therebetween; There is provided an electric insulating sheet static eliminator comprising at least one AC static eliminator having two AC ion generation electrodes.

According to another aspect of the present invention, there are at least two static elimination units provided at intervals in the movement direction of the sheet with respect to the movement path of the electrical insulating sheet, and each static elimination unit has The first electrode unit disposed on the first surface side of the sheet, and the second electrode unit disposed on the second surface side of the sheet, the first electrode unit comprising: The second electrode unit is electrically connected to the first ion generation electrode by using a neutralizing device for an electrically insulating sheet having a second ion generation electrode disposed opposite to the first ion generation electrode. A method for producing a static-removed electrical insulating sheet that neutralizes an insulating sheet,
(1) In at least one of the static elimination units of the static elimination unit, both the first electrode unit and the second electrode unit are configured to be an ion generation electrode exposed type,
(2) In each of the units, a direct-current and / or alternating-current ion generation electrode potential difference is applied between the first ion generation electrode and the second ion generation electrode,
(3) When the total number of the static eliminating units is n (n is an integer of 2 or more), among the n static eliminating units, n / 4 or more (rounded up after the decimal point) of the ion generating electrodes. The potential difference between the ion generation electrodes of each of the static elimination units is applied so that the potential difference between the ion generation electrodes in the other static elimination unit becomes a potential difference opposite in polarity to the potential difference between the ion generation electrodes.
Accordingly, there is provided a method for producing a static-removed electrical insulating sheet that neutralizes the electrical insulating sheet.

  Typical examples of the electrically insulating sheet to which the present invention is applied are a plastic film, a fabric, and paper. There are two types of sheets: a long sheet that is usually handled in a rolled state, and a sheet that is usually handled in a state where a large number of sheets are stacked. Examples of the plastic film include polyethylene terephthalate film, polyethylene naphthalate film, polypropylene film, polystyrene film, polycarbonate film, polyimide film, polyphenylene sulfide film, nylon film, aramid film, and polyethylene film. In general, a plastic film has higher electrical insulation than a sheet made of other materials. The static elimination technology provided by the present invention is effectively used for static elimination of a plastic film, in particular, disappearance of positive and negative charged regions mixed at a narrow pitch on the film surface.

In the present invention, the “ion generating electrode exposed type” electrode unit is, as shown in FIG. 6A, between the normal direction electrodes in the static elimination unit composed of the electrode unit with the tip of the ion generating electrode of the electrode unit as the center. An electrode unit in which a conductor such as a metal other than an ion generation electrode and a conductor that feeds power is not present in a three-dimensional virtual sphere having a radius of ½ of the distance.
In the present invention, the “movement path of the electrically insulating sheet” refers to a space through which the electrically insulating sheet passes for static elimination.

  In the present invention, the "normal direction of the electrically insulating sheet" is regarded as a plane having no slack in the width direction as the electrically insulating sheet moving through the moving path is not affected by external force such as gravity, And when there is a variation in the sheet position in the normal direction of the sheet accompanying the movement of the electrically insulating sheet, the plane (hereinafter referred to as the virtual average plane) when the sheet is at the temporally averaged position. Normal direction).

  In the present invention, the “width direction” refers to a direction in the plane of the virtual average plane and a direction orthogonal to the moving direction of the electrical insulating sheet. Needless to say, “each position in the width direction” means each position within a range that actually contributes to static elimination.

  In the present invention, the “tip of the ion generating electrode” refers to a portion of the respective portions of the ion generating electrode that forms an electric field for generating ions and is closest to the virtual average plane. In many cases, the ion generation electrode extends in the width direction. In this case, the tip of the ion generation electrode is defined at each position in the width direction.

  For example, when the ion generation electrode is a wire electrode formed of a wire extending in the width direction of the sheet, the portion of the wire closest to the virtual average plane in each part in the width direction corresponds. When the ion generation electrode is a row of needle electrodes extending in the normal direction of the electrically insulating sheet provided at a predetermined interval in the width direction, each needle has a portion (needle tip) closest to the plane. This is the “tip of the ion generation electrode” at the position in the width direction. At each position in the width direction where the needle tip does not exist, the “tip of the ion generation electrode” is defined by the position on the broken line 8aL that connects the needle tips provided at predetermined intervals in the width direction, as shown in FIG. 6E. Is done. The broken line 8aL is referred to as a virtual line at the tip of the ion generation electrode. At the position in the width direction where the needle tip exists, the position of the tip of the ion generation electrode on the virtual line coincides with the needle tip.

  In the present invention, “the first and second ion generation electrodes are arranged to face each other” means that the first and second ion generation electrodes face each other across the sheet movement path and each position in the width direction 2, including the position of the tip of the second ion generating electrode from the tip of the first ion generating electrode, and the position of the foot of the perpendicular drawn to a plane parallel to the virtual average plane and the tip of the second ion generating electrode There is no conductor, such as a shield electrode, between the position and the tip of the second ion generation electrode, including the position of the tip of the first ion generation electrode, and is lowered to a plane parallel to the virtual average plane. This means that there is no conductor such as a shield electrode between the position of the leg of the perpendicular and the position of the tip of the first ion generation electrode.

  In the present invention, “ion” refers to various forms of charge carriers such as electrons, atoms that have exchanged electrons, molecules with charges, molecular clusters, suspended particles, and the like.

  In the present invention, the “ion generating electrode” refers to an electrode that generates ions in a space near the tip of the electrode by corona discharge or the like by applying a high voltage.

  In the present invention, the “shield electrode” refers to an electrode that is disposed in the vicinity of the ion generation electrode and assists corona discharge at the tip of the ion generation electrode by applying an appropriate potential difference to the ion generation electrode.

  In the present invention, the “partial electrode” is one when the ion generation electrode of the electrode unit is configured as an assembly of a large number of conductors divided in the width direction as in the example shown in FIG. One conductor part.

  In the present invention, the “predetermined common potential” is a potential that serves as a reference for the potential of the power supply line connected to each ion generating electrode from the high-voltage power source, and is defined in common to each static elimination unit. Generally, the potential of the frame near the static eliminator and the frame manufacturing facility is set as a grounding point, and this potential is set to 0 [V], which is a predetermined common potential, but the reference potential is a potential other than 0 [V]. This reference potential is referred to as “predetermined common potential”. In the present invention, the “potential of the ion generation electrode” refers to the potential of the power supply line connected from the power source to each ion generation electrode with reference to the “predetermined common potential”.

  In the present invention, the “potential difference between ion generation electrodes” refers to a difference obtained by subtracting the potential of the second ion generation electrode opposite to the potential of the first ion generation electrode in each static elimination unit.

  In the present invention, “the potential difference between ion generation electrodes” in one static elimination unit and “the potential difference between ion generation electrodes” in another static elimination unit are opposite in polarity ” This means that the polarity of the “potential difference between ion-generating electrodes” in other static elimination units is opposite. In the present invention, the “charging pattern” refers to a state in which at least a part of the electrically insulating sheet is locally positively and / or negatively charged.

  In the present invention, the “apparent charge density” refers to the sum of local charge densities on both sides of the same position in the in-plane direction of the electrical insulating sheet. The local charge density refers to a charge density measured on the surface of the electrically insulating sheet within a diameter of about 6 mm or less, more precisely, a diameter of 2 mm or less.

In the present invention, “apparent non-charging” means that the apparent charge density is substantially zero (−2 μC / m ² or more and ² μC / m ² or less) at each part in the in-plane direction of the electrical insulating sheet. The state that has become.

  In the present invention, the “rear surface equilibrium potential” of the first surface of the electrically insulating sheet means that the ground conductor is brought into close contact with the second surface, and charges are induced in the ground conductor, whereby the second surface In a state where the potential is substantially zero, the measurement probe of the surface electrometer is sufficiently close to the first surface so that the distance from the first surface is about 0.5 to 2 mm And the potential of the first surface to be measured. As a measurement probe of the surface electrometer, a minute probe having a measurement opening diameter of 2 mm or less is used. Examples of such probes include a Monroe probe, 1017 (opening diameter: 1.75 mm), and 1017EH (opening diameter: 0.5 mm).

  In the present invention, “the back surface (second surface) of the electrically insulating sheet is in close contact with the ground conductor” means that both of the insulating sheet and the metal roll are in a state where there is no clear air layer. It means to contact with. This state is usually a state in which the thickness of the air layer remaining between them is 20% or less of the thickness of the sheet and 10 μm or less.

The distribution state of the back surface equilibrium potential on the first surface is determined by positioning the surface potential meter probe or the sheet with the ground conductor in close contact with the back surface (second surface) at the position of the XY stage or the like. Using the adjustable moving means, the back surface equilibrium potential is sequentially measured while moving at a low speed (about 5 mm / second), and the obtained data is obtained by mapping one-dimensionally or two-dimensionally. The back surface equilibrium potential of the second surface is measured in the same manner.
In the present invention, the “aerial potential” of the electrical insulating sheet refers to a potential measured with the electrical insulating sheet floating in the air. Since the thickness of the sheet is sufficiently small with respect to the distance to the grounded ground, the electric potential from the grounding point is the sum of the charging of the first surface and the charging of the second surface of the electrically insulating sheet. In the present invention, each potential is a potential from the grounding point unless otherwise specified.

In the present invention, the “normal-direction inter-electrode distance d _1-m ” of the mth static elimination unit refers to the tip of the first ion generation electrode of the mth static elimination unit from the upstream in the moving direction of the sheet. The distance in the normal direction of a sheet | seat between the front-end | tips of 2 ion production electrodes. Hereinafter, the “kth static elimination unit” refers to the kth (k = 1, 2,..., N) static elimination units counted from the upstream in the sheet moving direction.

In the present invention, the “static discharge unit interval d _2−p ” between the p th static elimination unit and the p + 1 th static elimination unit is the number of the p th static elimination unit in the sheet moving direction shown in FIG. 6C. the midpoint 5x _p of a line connecting the tip of the first ion generation electrode and the tip of the second ion generation electrode, the first p + 1 th static eliminating unit, the tip of the first ion generation electrode and the second ion-generating This is the distance in the sheet moving direction between the middle point 5xp _{+ 1} of the line segment connecting the tip of the electrode.

In the present invention, the term "electrode displacement amount d _0-m" static eliminating unit, as shown in FIG. 6D, the to tip and opposed to the first ion generation electrode 5d _m in the m-th static eliminating unit 2 It refers to the distance in the moving direction of the sheet between the tip of the ion generation electrode 5f _m.

In the present invention, the “DC power supply” refers to a power supply having a pulsation rate of 20% or less, in which the output voltage maintains the same polarity for 1 second or more without inverting the polarity with respect to the ground point. Preferably, it is not reversed for 20 seconds or more, or more preferably, during one static elimination operation of one sheet (for example, considering from the beginning to the end of conveyance of one roll of sheet roll as one static elimination operation). Configure as follows. However, polarity reversal due to aperiodic noise components such as white noise is not referred to as polarity reversal here. The DC voltage at a certain moment of such a DC power supply is defined by the average value of the voltage for the past one second from the moment.
The DC potential difference having a “pulsation rate” of x% means that the DC component of the potential difference is P [kV], and the fluctuation width of the periodic fluctuation component is Pr [kV]. Pr / P = y / 100 Say.

  According to the present invention, the charge of an electrically insulating sheet in which positive and negative charges are mixed on the charging pattern and the front and back of the sheet is greatly improved in the efficiency of attaching ions to the surface of the sheet. Further, it is possible to make the state of “apparently non-charged” and further reduce the charge amount of each surface of the sheet uniformly with little unevenness in the moving direction of the sheet. As a result, it is possible to suppress the occurrence of inconveniences such as vapor deposition defects and non-uniform distribution of the coating agent in the post-processing step.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a static eliminator for an electrical insulating sheet according to the present invention will be described with reference to the drawings. A case where a plastic film (hereinafter simply referred to as a film) is used as the electrically insulating sheet will be described as an example. The present invention is not limited to these examples.

FIG. 5 is a schematic front view of an embodiment of the static eliminator according to the present invention. This static elimination apparatus 5 is preferably used for static elimination of a plastic film. In FIG. 5, a traveling film S is stretched between a guide roll 5a and a guide roll 5b. The guide roll 5a and the guide roll 5b are each rotated clockwise by a motor (not shown). The film S continuously moves in the direction of the arrow 5ab at a speed u [unit: mm / second] by the rotation of the guide rolls 5a and 5b. Between the guide roll 5a and the guide roll 5b, n (where n is an integer of 2 or more) static elimination units SU ₁ ,..., SU _n are in the moving direction of the film S (the direction of the arrow 5ab). spaced, these static eliminating units _SU 1, · · ·, the SU _n, static eliminator 5 is constituted.

The first static elimination unit SU ₁ is composed of a _first electrode unit EUd ₁ and a second electrode unit EUf ₁ . The first electrode unit EUd ₁ faces the first surface 100 of the film S and is spaced from the first surface 100. The second electrode unit EUf ₁ faces the second surface 200 of the film S and is spaced from the second surface 200. The first electrode unit EUd ₁ and the second electrode unit EUf ₁ face each other across the film S.

The first electrode unit EUd ₁ includes a first ion generation electrode 5d ₁ as shown in FIG. 6A. The second electrode unit EUf ₁ has a second ion generation electrode 5f ₁ .
First ion-generating electrode 5d ₁ second of the ion generating electrode 5f _1, across the film S, are opposed to each other.

When m is an integer between 1 and n inclusive, the m-th static eliminating unit SU _m, similarly to the 1st static eliminating unit SU _1, the film S has a first ion generation electrode 5d _m first the first electrode unit EUd _m towards the surface 100 of, and a second electrode unit EUf _m towards the second surface 200 of the film S has a second ion generation electrode 5f _m. A first electrode unit EUd _m, and the second electrode unit EUf _m, spaced apart with respect to each film S, are opposed to each other across the film S. Moreover, the first ion generation electrode 5d _m and the second ion generation electrode 5f _m, across the film S, are opposed to each other.

In the static elimination unit SU _m having a configuration in which the first and second electrode units are arranged to face each other, the first electrode unit EUd _m and the second electrode unit EUf _m are shield electrodes as shown in FIG. 6A. 5 g _m and 5 h _m are “ion generating electrode exposed type” electrode units not arranged in the vicinity of the ion generating electrode.

The reason is as follows. In the present industry, the two electrode units are not opposed to each other across the film S as in the embodiment of the present invention, and the electrode units are often used one by one. In this case, in FIG. As shown, the shield electrodes 5g _m and 5h _m are arranged in the vicinity of the tips of the ion generation electrode 5d _m and the ion generation electrode 5f _m , respectively, and connected to the ground, so that the shield electrode 5g _m and the ion generation electrode 5d are connected. during the _m or, for generating ions to give a stable potential difference between the shield electrode 5 g _m and the ion generating electrode 5f _m, shield electrodes are considered essential. This is because if the shield electrode is not provided, the discharge becomes unstable and a spark discharge is generated, which makes it unusable.

However, according to the knowledge of the inventors, in the present embodiment in which the first electrode unit EUd _m and the second electrode unit EUf _m are arranged to face each other, the first ion generation electrodes 5d _m that face each other. If between the second ion-generating electrode 5f _m, as described below, the voltage of opposite polarity relative to the "predetermined common potential" is applied, the ion generating electrode 5d _m and the ion generating electrode stable potential difference is obtained between the 5f _m, it may not shield electrode. As shown in FIG. 6B, even when the electrode unit having a shield electrode disposed facing, as described above, between the first shield electrode 5 g _m of the first ion generation electrode 5d _m, and the second shield since a stable potential difference between the electrode 5 g _m and the second ion generation electrode 5f _m is obtained, may be used an electrode unit having a shield electrode, but in this case, first, and, second ion-generating The breakdown of ions generated from the electrodes is roughly classified into the amount adhering to each surface of the film S and the amount leaking to the ground via the shield electrode, and the latter contributes to charge removal on each surface of the film S. do not do. In other words, a large amount of useless ions are generated. For this reason, the output current supplied from the power source to each ion generating electrode also needs to be supplied with a current corresponding to both the former and the latter, and a large-capacity power source is required. Therefore, in order to eliminate such waste, to adhere most of the ions generated from the ion generation electrode to each surface of the film S, and to contribute to the charge removal on each surface of the film S efficiently (with a small output current), It is preferable that the first and second electrode units are “ion generation electrode exposed type” electrode units, and the first ion generation electrode and the second ion generation electrode are arranged to face each other with the film S interposed therebetween. . As a result, the power source can be of a small capacity.

As shown in FIG. 10, in the electrode unit, the ion generating electrode 8a is composed of a plurality of partial electrodes 8a ₁ , 8a ₂ ,... If d ₅ is small, when applying a large potential difference (such as to apply a reverse polarity voltage to each other) to each sub-electrode adjacent to the width direction of the film S, produced from these positive, negative ions are the ion-generating electrode Since the amount of ions attached to each surface of the film S is reduced, the voltage applied to each partial electrode adjacent to the width direction of the film S is “predetermined common potential” (for example, It is preferable to reduce the potential difference, for example, by setting the same polarity to each other with respect to the ground of 0 [V] potential. As a result, an increase in the output current from the power supply due to the coupling of the generated positive and negative ions and the effect of neutralization can be suppressed, and a small capacity power supply can be configured. Further, when the voltage applied to the partial electrodes adjacent in the width direction of the film S is opposite in polarity to the “predetermined common potential”, the interval d ₅ between the partial electrodes adjacent in the width direction of the film S is large. The effect of binding and neutralization of the generated positive and negative ions can be suppressed, but it is difficult to uniformly adhere to the entire surface of the film S in the width direction. to reduce the distance d ₅ of partial electrodes, each part electrodes adjacent in the width direction of the film S, it is preferable to apply a same polarity of the voltage from each other. In this case, the distance d ₅ parts electrodes adjacent in the width direction of the film S is preferably smaller than 0.8 times the maximum value of the normal direction inter-electrode distance static eliminating unit. The ion generation electrode may be a wire electrode that is a single conductor instead of an assembly of partial electrodes. Distance d ₅ in this case shall be considered zero.

In the first static elimination unit SU ₁ , the first ion generation electrode 5d ₁ and the second ion generation electrode 5f ₁ are each in relation to a “predetermined common potential” (here, 0 [V]). The first DC power source 5c and the second DC power source 5e having opposite polarities are connected. Further, the first ion generation electrode 5d ₂ in the second static eliminating unit SU _2, the first ion-generating electrode 5d ₁ in the first static eliminating unit SU ₁ "predetermined common potential" (here, 0 [V]) is connected to the second DC power supply 5e of opposite polarity relative to the second ion generation electrode 5f ₂ in the second static eliminating unit SU ₂ is first in the second static eliminating unit SU ₂ (here, 0 [V]) 1 of the ion-generating electrode 5d ₂ "predetermined common potential" is connected to the first DC power supply 5c of opposite polarity to. Thus, the second and the ion-generating electrode 5f ₁ in the first static eliminating unit SU _1, second is the ion generating electrode 5f ₂ in the second static eliminating unit SU _2, "predetermined common potential" (here , 0 [V]) are connected to DC power supplies (5e and 5c) having opposite polarities.

In the present embodiment, in each static eliminating unit SU _m of static eliminator 5, the first and the ion-generating electrode 5d _m and the second ion-generating electrode 5f _m "predetermined common potential" (here, 0 [V] ) In the adjacent p-th and p + 1-th neutralization units (where p is an integer between 1 and n-1), the p-th neutralization unit SU. the first and the ion generating electrode 5d _p in _p, the first and the ion-generating electrode _{5d p + 1} in the p + 1-th static eliminating unit _{SU p + 1} "predetermined common potential" (here, 0 [V]) to each other with respect to are connected in reverse polarity DC power source, the p-th static eliminating unit SU and the second ion generation electrode 5f _p in _p, the p + 1-th static eliminating unit _{SU p + 1} second ion generation electrode 5f in The ₊₁ "predetermined common potential" (here, 0 [V]) is connected to a DC power supply of opposite polarity with respect. As a result, in all the static elimination units, the potentials of the first ion generation electrode and the second ion generation electrode facing each other are opposite to each other with respect to the “predetermined common potential” (here, 0 [V]). And the potentials of the first (second) ion generation electrodes adjacent to each other in the sheet moving direction also have opposite polar potentials.

In this way, the inventors applied voltages having opposite polarities to the first ion generation electrode and the second ion generation electrode with respect to the “predetermined common potential” (here, 0 [V]). Two or more static eliminating units are arranged in the moving direction of the film S, and a “predetermined common potential” (here, 0 [V] is applied to the first ion generating electrode adjacent to the moving direction of the film S of each static eliminating unit. )), The following difference in effect is obtained when comparing the case where the voltages of opposite polarities are applied with the case where there is only one static elimination unit as described above under the same conditions did.
(1) In the former case, the amount of ions adhering to each surface of the film S from each ion generating electrode is larger than in the latter case.
(2) Especially, when each static elimination unit interval in the moving direction of the film S is not less than 0.8 times and not more than 2 times the maximum value of the distance between the normal direction electrodes of the static elimination unit, The amount of ions attached to the surface increases.

  The reason for this is not clear, but depending on the intervals between the static eliminating units arranged in the moving direction of the film S, the electric field in the vicinity of each ion generating electrode has some influence on each other. It is considered that the amount of ions attached to the surface increases. On the other hand, when the intervals between the static eliminating units arranged in the moving direction of the film S are small, positive and negative product ions are combined and neutralized in the space between the electrode units. It is believed that the amount of ion attachment is reduced and there is an optimal range of these two effects.

In this way, two or more static elimination units are arranged in the moving direction of the film S, and the potential between the ion generation electrodes of the adjacent p-th static elimination unit and the (p + 1) th (where p is 1 to n−1). When the potential between the ion generation electrodes of the static elimination unit of (an integer) is opposite to each other, the interval between the p-th and p + 1-th static elimination units adjacent in the moving direction of the film S is d _{2 -p} [mm] 0.8 times or more and 2 times or less of the maximum value of the distance between the normal direction electrodes of each static elimination unit is preferable, and with such a configuration, it could not be achieved by the techniques disclosed in Patent Documents 1 to 7 In addition, it is possible to efficiently reduce the positive and negative charges on each surface of the film S and to reduce the uniform charge on each surface of the sheet. In each static elimination unit, the amount of ion adhesion to each surface of the film S is determined by the difference between the potentials of the first and second ion generation electrodes facing each other. For example, a “predetermined common potential” is applied to the first ion generation electrode. ”(For example, 0 [V]), when the second ion generating electrode is grounded and the potential is set to 0 [V], the potential between the first and second ion generating electrodes is It is possible to attach ions having opposite polarities to the respective surfaces of the film S due to the difference between the ion generation electrodes, but particularly with respect to all the ion generation electrodes, the “predetermined common potential” is set to 0 [V]. By applying a potential, more ions can be attached to the film due to a potential difference between each first (/ second) ion generation electrode of the static elimination unit adjacent in the sheet moving direction, which is more preferable.

  In the present embodiment, two static elimination units are used, and the voltage applied to the first ion generation electrode in the first static elimination unit is set to “predetermined common potential” (here, 0 [V]). Positive (applied voltage to the second ion generating electrode is negative), negative applied voltage to the first ion generating electrode in the second static elimination unit (positive applied voltage to the second ion generating electrode) However, there is no problem even if all applied voltages are reversed. Furthermore, as long as the potential difference between the ion generation electrodes of the static elimination units has a reverse polarity, it is sufficient because positive and negative charges can be reliably applied to both surfaces of the sheet.

  The total number n of static elimination units can take an arbitrary value of 2 or more depending on the charge amount (charge density) to be neutralized, the speed of the film, and the like. However, at that time, it is preferable that the number of static elimination units to which a positive ion generation electrode potential is applied is substantially equal to the number of static elimination units to which a negative ion generation electrode potential is applied. This is because, for example, when the number of static elimination units to which a positive ion generation electrode potential is applied is larger than the number of static elimination units to which a negative ion generation electrode potential is applied, This is because, rather than contributing to static elimination, the first surface of the film S is shifted positively, and the charging action is increased (in this case, however, the charging of each surface of the film S is shifted as a whole). However, since many ions selectively adhere to the portion having a finely charged pattern, there is no change in that it has the effect of reducing the finely charged pattern. Kept.) Here, the number of static elimination units to which a positive ion generation electrode potential is applied is substantially equal to the number of static elimination units to which a negative ion generation electrode potential is applied. It means that the number of neutralizing units to be applied is an integer satisfying n / 4 <k <3n / 4 among n neutralizing units, k. This is because even if there are static elimination units that shift the charge on each side of the film S, more than half of the static elimination units do not shift the charge on each side of the film S, and positive and negative polarity ions are balanced. It is because it adheres.

  As a mechanical configuration for attaching positive and negative polar ions in the most balanced manner, the number n of the static elimination units is an even number, and the k ion elimination units in which k = n / 2, A configuration in which a negative ion-generating electrode potential is applied in the remaining static elimination units.

  Here, in the adjacent static elimination units, it is preferable that the mutual ion generating electrode potentials have opposite polarities as shown in the present embodiment. This is because, in addition to the effect of increasing the amount of generated ions from each ion generating electrode as described above, for example, in the static eliminator comprising the same ten static eliminator units, in the five static eliminator units upstream in the moving direction of the film S, A positive ion generation electrode potential is applied to the “predetermined common potential” (here, 0 [V]), and the “predetermined common potential” (here, in the five static elimination units downstream in the moving direction of the film S). Then, when a negative ion-generating electrode potential is applied to 0 [V]), the first surface of the film S after passing through all the static elimination units is likely to be negatively charged. The reason for this charging is that the amount of ions adhering to each surface of the film S is affected by the amount of charge on each surface of the film S, and negative ions are applied to the film on which the first surface is strongly positively charged. This is because the first surface tends to have a larger amount of negative ions than the case where the first surface attaches negative ions to an uncharged film (the reverse case also has the same tendency). For this reason, as shown in the present embodiment, it is preferable that the potentials between the ion generation electrodes of the adjacent neutralization units have opposite polarities so that positive and negative ions can be alternately attached.

However, even if it takes these structures, each surface of the film S after passing through all the static elimination units may be charged slightly strongly to either positive or negative polarity. The following three points are considered as causes.
(1) For the reasons described above, the amount of ions adhering to each surface of the film S tends to increase from the most downstream static elimination unit in the moving direction of the film S, and each surface of the film S is charged to this polarity. This tends to be stronger as the moving speed of the film S is slower. In addition, the electrode unit of the “ion generation electrode exposed type” electrode unit tends to be stronger.
(2) Difference in ion generation capability between neutralization units (for example, when the amount of ions generated in the first neutralization unit is small and the amount of ions generated in the second neutralization unit is large, the second neutralization unit To the polarity of ions attached to each surface of the film S)
(3) Function stop of individual static elimination unit due to power failure etc. (Charged from opposite static elimination unit to opposite polarity and polarity of ions that should have adhered to each surface. Positive DC power supply or negative DC Even if only one side of the power source fails, if the ion adhesion from one side of the film S stops, the ion adhesion from the opposite side of the film S is also suppressed. (Since the unit stops functioning, the film S almost never appears to be charged.)
Even in such a case, the film S is in an apparent non-charged state (unless most of the static elimination units are stopped). In addition, each surface of the film S has little uneven charging or periodic charging, and each surface of the film S is in a state of being charged with a reverse polarity in terms of DC.

  Even in a film having such a charged state, the charge itself is rarely a problem. This is because, as described in the prior art, uneven coating and the appearance of static marks after vapor deposition often cause local charging of the film indicated by the charging pattern or the like.

Further, each surface of the film S after passing through all the static elimination units is a static elimination unit in the case where the most downstream static elimination unit in the moving direction of the film S is a DC static elimination unit having a DC potential difference between the ion generation electrodes. If it is easy to charge to the polarity of the applied voltage based on the “predetermined common potential” to each ion generation electrode, the absolute value of the potential difference between the ion generation electrodes of the nth neutralization unit on the most downstream side is calculated in advance. The distance d _1-n between the normal direction electrodes of the n-th neutralization unit SU _{n at} the most downstream, which is smaller than the absolute value of the potential difference between the ion generation electrodes of other DC neutralization units, is the normal line of the other neutralization unit larger than the direction electrode distance _{d 1-1 ~d 1- (n-1} ), the electrode displacement amount of static eliminating units in the n-th most downstream, that of the other static eliminating units In the first and second electrode units of the one or more static elimination units including the nth most downstream, the “ion generating electrode exposed type” electrode unit as shown in FIG. Instead, by using an electrode unit having a shield electrode as shown in FIG. 10B in the vicinity of the ion generation electrode, the amount of ions adhering to each surface of the film S in the downstream static elimination unit is reduced. It is also possible to leave. These may be performed only on the most downstream neutralization unit, or may be performed gradually from upstream to downstream of the neutralization unit.

According to the inventor's knowledge, the absolute value of the potential difference between the ion generation electrodes in the most downstream DC neutralization unit is approximately 50 to 90% of the absolute value of the potential difference between the ion generation electrodes in the other DC neutralization units. It is preferable to do this. As an achievement means thereof, the distance d _1-n between the normal direction electrodes of the n-th DC neutralization unit SU _{n at} the most downstream is the distance d _1-1 -d ₁ -d between the normal direction electrodes of the other DC neutralization units. _(N-1) is preferably set to approximately 110 to 200%, and the amount of electrode shift of the n-th DC neutralization unit at the most downstream is the normal-direction inter-electrode distance d _{1-1 to} d _{1- (} About 40 to 160% of _n-1) is preferable. These achievement means may be performed alone or in combination, but the back surface equilibrium potential of each surface of the film S is measured for each static elimination condition (for example, moving speed, film thickness, etc.) of the film S. It is preferable to adjust appropriately.

  As shown in FIG. 7, it is further arranged opposite to each other across two or more static elimination units to which a direct-current ion generating electrode potential difference is applied. One or more AC static eliminator units having a first AC ion generation electrode 5i and a second AC ion generation electrode 5j applied from a power source 5k, 5l are arranged, and each surface of the film S is deliberately charged positively or negatively. By creating unevenness, it is possible to prevent the charge on each surface of the film S from being biased to a single polarity (on average in the moving direction of the film S, each surface is in a balanced state).

  In particular, when the moving speed of the film S is slow, such as immediately after the start of movement of the film S or immediately before stopping, or when the thickness of the film S is thick, it is preferable to positively use an AC static elimination unit. This is because, as described above, when the DC voltage is used, as the moving speed of the film S becomes slower and the thickness of the film S becomes thicker, each surface of the film S is charged with either positive or negative polarity, In particular, there is a tendency to be charged to the polarity of ions adhering from the ion generating electrode arranged on the most downstream side in the moving direction of the film S. On the other hand, if the AC static elimination unit is used, the film S is not charged to one polarity. This is because the positive and negative balances can be achieved on both sides of the film S.

  By providing the AC static elimination unit at the most downstream in the moving direction of the film S, when the film S is moving slowly or when the film S is thick, only the ion generating electrode in the AC static elimination unit generates AC ions. Applying a potential difference between the electrodes and applying a potential difference between the DC ion generating electrodes to the ion generating electrode in the DC static elimination unit provided upstream in the moving direction of the film S is stopped or as the moving speed of the film S becomes slower The potential difference between the ion generation electrodes in the DC neutralization unit is decreased. As the film S becomes thicker, the potential difference between the ion generation electrodes in the DC neutralization unit is decreased. The potential difference between the ion generating electrodes in each static elimination unit and AC static elimination unit Driving methods such as Azukasuru is also possible.

  Further, even when each surface of the film S is charged to one polarity (each surface of the film S is charged to the opposite polarity and apparently uncharged) due to a failure of the DC power source or the like, the AC neutralization unit is provided on the most downstream side. Thus, since it is possible to reduce the unipolar charge on each surface of the film S, it is preferable to provide an AC static elimination unit downstream from the DC static elimination unit.

Furthermore, in the case where the first and second ion generation electrodes of each static elimination unit are partial electrodes having a needle-like structure (particularly in the case of an “ion generation electrode exposure type” electrode unit), In each surface, the unevenness of the generated ions may occur in the width direction of the film S. The reason is considered as follows.
(1) The electric field between the first and second ion generating electrodes arranged opposite to each other is strong, and in particular, the electric field directly below the opposing acicular partial electrode is strong. Easy to accelerate and adhere to each surface.
(2) Since the electric field is weaker in the range between adjacent needle-like partial electrodes arranged in the width direction of the film S than directly under each needle-like partial electrode, the acceleration force of the generated ions is weakened. The amount of ions attached to each surface is reduced.
(3) In particular, in the case of an “ion generating electrode exposed type” electrode unit, since the electric field in the vicinity of the intermediate point of the acicular partial electrodes between the opposing ion generating electrodes is strong, Further, the unevenness of the amount of ion adhesion in the range between adjacent needle-like partial electrodes, that is, the width direction of each surface of the film S is further increased.
Even in such a case, by providing the AC neutralization unit on the most downstream side, ion adhesion unevenness in the width direction of the film S can be alleviated. Therefore, it is preferable to provide the AC neutralization unit downstream from the DC neutralization unit. Furthermore, the electrode unit of the AC neutralization unit provided downstream is not an “ion generation electrode exposed type” electrode unit as shown in FIG. 8A, but in the vicinity of the ion generation electrode as shown in FIG. 8B. When the electrode unit having the shield electrode is used, ions can be attached to each surface of the film S without significant unevenness in the width direction of the film S. Therefore, the electrode unit is disposed downstream in the moving direction of the film S. It is more preferable to use an electrode unit having a configuration having a shield electrode in the vicinity of the ion generation electrode as shown in FIG. When the shield electrode is used, a predetermined common potential (here, a potential of 0 [V]) is preferably applied to the shield electrode. The absolute value of the DC voltage applied to the static eliminator in the present invention is preferably about 3 kV to 15 kV when the predetermined common potential is 0 [V], and the distance between the normal direction electrodes is preferably 10 mm to 100 mm. It is most preferable that the tip of the ion generation electrode of each static elimination unit is completely opposed, that is, is opposed without deviation in the sheet moving direction. However, as described above, the electrodes of the most downstream DC neutralization unit should be positively or negatively charged on each surface of the film S after passing through all the DC neutralization units arranged in the moving direction of the film S. The amount of deviation may be adjusted to balance the positive and negative charges on each surface of the film S.

  The result of performing static elimination on the film using the above static eliminator will be described.

The effect of static elimination in Examples and Comparative Examples was evaluated by the following method.
[Measurement of back surface equilibrium potential and charge density on each side of film]
The surface opposite to the evaluation surface of the film was brought into close contact with a metal roll made of a hard chrome plating roll having a diameter of 10 cm, and the potential was measured. A Monroe model 244 was used as the electrometer, and a Monroe probe 1017 having an opening diameter of 1.75 mm was used as the sensor. An electrometer was placed 2 mm above the film. The field of view at this position is in the range of about 6 mm in diameter from the Monroe catalog. The back surface equilibrium potential V _f [unit: V] was measured with an electrometer while rotating the metal roll at a low speed of about 1 m / min using a linear motor.

  In addition, the maximum in-plane value of the absolute value of the back surface equilibrium potential was determined by the following method. That is, the electrometer is scanned in the film width direction by an appropriate distance (for example, about 20 mm) according to the electrode unit structure, and the position in the width direction where the maximum absolute value is obtained is determined. Next, the position in the width direction is fixed, and the electric potential is measured by scanning the electrometer in the moving direction of the film when the film is subjected to static elimination treatment, that is, in the length direction of the film. Ideally, the back surface equilibrium potential in the film plane should be measured two-dimensionally at all points, but the distribution of the potential in the film plane is approximated by the method described above. When the film width exceeds 1 m, about 20 mm is cut out at approximately the center and end in the width direction of the film and scanned to find a place where the maximum value can be obtained. The potential is measured by scanning in the moving direction of the film. In addition, when a locally strong charged spot is found at a specific position in the width direction of the film before static elimination, the film before and after static elimination is scanned in the moving direction of the film at the position in the width direction, Measure the potential. This determined the maximum absolute value in the film plane.

Based on the back surface equilibrium potential V _f [unit: V] which is the maximum absolute value, the charge density σ [unit: C / m ² ] of the film evaluation surface directly under the sensor is expressed by the relation σ = C × V _f ( However, C was calculated | required by the electrostatic capacitance per unit area [unit: F / m < ² >]). Since the film thickness is sufficiently smaller than the measurement field of view, the electrostatic capacity C per unit area is the parallel plate electrostatic capacity C = ε ₀ × ε _r / d _f (where _df is the thickness of the film) , Ε ₀ is approximated by a dielectric constant of 8.854 × 10 ⁻¹² F / m in vacuum, and ε _r is a relative dielectric constant of the film). The relative dielectric constant ε _r of polyethylene terephthalate was 3.

In this embodiment, when determining the effect of static elimination on each side of the film, the determination is made from the following two viewpoints.
(1) In the film in which each surface (the front surface and the back surface, or the first surface and the second surface) was charged positively and negatively (and both surfaces were opposite in polarity) before static elimination, Can the charge density fluctuation after static elimination be greatly reduced?
In this determination, each surface of the film is charged with a reverse polarity with a charge density of 190 μC / m ² or more before static elimination, and each surface of the film before the static elimination has a swing width of 760 μC / m ² or more. A battery having a charge density of opposite polarity is used, and the determination is made according to the following criteria.
A: The charge density fluctuation after static elimination is 30 μC / m ² or less.
◯: The charge density fluctuation after static elimination is 30 μC / m ² or more, but is reduced by 30 μC / m ² or more before and after static elimination.
X: The reduction of the fluctuation width before and after static elimination is smaller than 30 μC / m ² .

The standard for the fluctuation density of the charge density is 30 μC / m ² , in the case of “apparent charge removal”, which is charge removal by the conventional charge removal technology, the decrease in charge density of the bipolar charging on both sides is zero or at most The absolute value is 1 μC / m ² , and it is clear that a larger amount of charge can be removed.
(2) In a film in which each surface of the film is substantially uncharged before static elimination, isn't excessive charge generated on the film after static elimination?
For this determination, a film whose absolute value of the charge density on each surface of the film was 30 μC / m ² or less before static elimination is used, and the determination is performed in the following four stages.
A: Absolute value of charge density after static elimination is 30 μC / m ² or less, and fluctuation width of charge density is 60 μC / m ² or less. And the absolute value of the back surface equilibrium potential is 100V or less.
A: The absolute value of the charge density after static elimination is 100 μC / m ² or less, and the fluctuation density of the charge density is 60 μC / m ² or less. And the absolute value of the back surface equilibrium potential is 100-300V.
△: The absolute value of the charge density after static elimination at 100 .mu.C / ^{m 2} or less, amplitude of the absolute value of the charge density is greater than ^{60μC / m 2, 90μC / m} 2 or less. And the absolute value of the back surface equilibrium potential is greater than 300V.
X: The absolute value of the charge density after static elimination is 100 μC / m ² or more, and / or the amplitude of the absolute value of the charge density is larger than 90 μC / m ² .
<Experiment 1: Comparison of the neutralization ability of the charged portion of the sheet and the non-influence on the uncharged portion of the sheet between the “ion generation electrode exposed type” and the “shield type”, and the direct current neutralization unit and the alternating current neutralization Comparison of neutralization capability of charged parts of sheet and unaffected parts of uncharged parts of sheet when using unit>
[Example 1-1]
In the static eliminator shown in FIG. 13, a biaxially stretched polyethylene terephthalate film (Lumirror 38S28 manufactured by Toray Industries, Inc., hereinafter referred to as the original fabric A) having a width of 300 mm and a thickness of 38 μm is used as the electrical insulating sheet S. The film S was moved at a speed u [unit: m / min] shown in FIG. The original fabric A includes two types of original fabrics A-1 and A-2 with different charge amounts. Each of the original fabrics A has a width of 10 mm as shown in FIG. There was periodic charging. As shown in FIG. 9, the back surface equilibrium potential of the charged portion (AA ′ in FIG. 8) of the periodic fabric A-1 has a peak peak of 270 V centered on 0 V (the fluctuation in charge density on each surface). The width is 190 μC / m ² ), and the back surface equilibrium potential of the charged portion (AA ′ in FIG. 8) of the cyclically charged portion of the original fabric A-2 has a peak peak of 1080 V (center of each surface) The fluctuation range of the charge density was 760 μC / m ² ). In addition, the interval between the peak value of the absolute value of the back surface equilibrium potential of the positive charging unit and the peak value of the absolute value of the back surface equilibrium potential of the negative charging unit in the periodic charging unit is approximately between 1 to 10 mm. Yes. Further, the back surface equilibrium potential of the part of the film S other than the charged part (the part having a width of 10 mm) is 15 V or less in absolute value for both the original fabric A-1 and the original fabric A-2 (the charge density on each surface is −10 to +10 μC). / M ² range), and it was confirmed that it was almost uncharged.

As the first and second electrode units, using the HER-type electrode (Kasuga Electric Works Co., Ltd.), as shown in FIG. 10, the ion generating electrode _5d 1 _{~5d n,} the ion generating electrode _5f 1 _{~5f n} Is a needle electrode array 8a (an assembly of partial electrodes 8a ₁ , 8a ₂ ,...), And an “ion generating electrode exposed type” electrode unit 8A having no shield electrode 8b and the shield electrode 8b are ion-generated. An electrode unit 8B which is not an “ion generation electrode exposure type” in the vicinity of the electrode was used in combination. The needle electrode array 8a, the width direction of the spacing d ₅ is the electrode unit 8A of the film S, 8B both are 10 mm, all needles conduction state of each electrode unit, i.e., the same voltage is applied, the same potential It is in a state of having. Regarding the electrode unit 8B which is not an “ion generation electrode exposed type” having a shield electrode in the vicinity of the ion generation electrode, the needle electrode array 8a and the shield electrode 8b are insulated from each other by insulating materials (vinyl chloride) 8d and 8e. The total number n of the DC static eliminating units is 6 (total n is 8 when also include AC static eliminating units described later), static eliminating units SU ₁ to SU ₆ upstream six moving direction of the film S is the "ion-generating electrode Exposed" The electrode unit 8A was used, and the downstream two units SU ₇ and SU ₈ used an electrode unit 8B that was not “ion generation electrode exposure type”. The first and second electrode units are installed up and down across the film S so as to be orthogonal to the moving direction of the film S and parallel to the surface of the film S, did. In the first and second electrode units, the film moving direction and the width direction position of the tip of the needle were the same. However, only the _6th static elimination unit SU _{6 located} downstream of the static elimination units SU _{1 to} SU ₆ arranged upstream in the moving direction of the film S is adjusted so that the electrode displacement amount d _0-6 is 25 mm. The second electrode unit EUf ₆ is shifted in the moving direction in the moving direction of the film S, and the other static eliminating units are provided with electrode shift amounts d _0-n (n = 1, 2, 3, 4, 5, 7, 8 ) Was set to 0 mm.

  The tip of each needle electrode row, that is, the tip of each ion generation electrode of each static elimination unit is arranged linearly in the width direction of the film S, and the deflection of the electrode with respect to the normal direction and the moving direction of the film S can be ignored. It was so small.

Normal direction inter-electrode distance _d 1-1 _{to d 1-8} are all set to 40 mm, static eliminating unit intervals _d 2-1 _{to d 2-4} are all _{40 mm,} d _{2-5, d 2-6} is 52. 5 mm and d _2-7 were set to 55 mm.

  In each of the six static elimination units arranged upstream with respect to the moving direction of the film S, the first ion generation electrode and the second ion generation electrode facing each other have a predetermined common potential (here, 0 [V]). On the other hand, DC voltages having opposite polarities and a difference in absolute value of 0.1 kV or less were applied. A positive DC voltage is applied to the first ion generation electrode of the odd (first, third, fifth) neutralization unit from the most upstream in the moving direction of the film S so that the potential difference between the ion generation electrodes becomes positive. Then, a negative DC voltage is applied to the first ion generation electrode of the even (second, fourth, sixth) static elimination unit from the most upstream in the moving direction of the film S so that the potential difference between the ion generation electrodes becomes negative. I made it. The time average value of the absolute value of the applied voltage was 8 kV, that is, the absolute value of the potential difference between the ion generation electrodes in each static elimination unit was 16 kV. The pulsation component is a sawtooth wave having a pulsation rate of 0.1% or less for both a positive DC voltage and a negative DC voltage. This pulsation is caused by rectifying and smoothing commercial alternating current of 60 Hz in order to obtain a DC voltage. For DC voltage application, two DC voltage outputs from both function generators (one for positive voltage application and one for negative voltage application) (both function synthesizer 1915 manufactured by NF Corporation) are used (for positive voltage amplification). , A negative voltage amplification one) and a high-voltage power supply (both MODEL20 / 20B manufactured by TREK Co., Ltd.) were used. Further, the pulsation rate of the DC applied voltage was 0.1% by confirming the waveform before voltage amplification with an oscilloscope (Nippon Hewlett-Packard Co., Ltd. 54540C). The amplification factor of the high-voltage power supply is 2000 times, and the accuracy is 0.1%.

Further, in each of the two static elimination units SU ₇ and SU ₈ arranged downstream with respect to the moving direction of the film S, the first ion generation electrode and the second ion generation electrode facing each other have a predetermined common potential (here In the case of 0 [V]), 60 Hz AC voltages having opposite polarities are applied from AC high-voltage power supply 5k and 5l (PAD-101 type manufactured by Kasuga Electric Co., Ltd.), and the effective value is 7 kV. Further, 60 Hz AC voltages having opposite polarities were applied to the first ion generating electrodes 5d ₇ and 5d ₈ adjacent to each other in the moving direction of the film S, and the effective value thereof was 7 kV.

Shield electrode _{5g 7, 5g 8, 5h 7} , 5h 8 of each AC electrode unit at two static eliminating units _SU 7, SU ₈ disposed downstream of the movement direction of the film S is grounded all the earth, potential 0 [ V]. Opening width _SOg 7 _{~SOg 8} of the shield electrodes each electrode unit of two AC static eliminating unit _SU 7, SU _8, and _all SOh 7 ~SOh ₈ is 18 mm, the shortest distance of the tip and the shield electrodes of the ion generating electrode Are all 12 mm, and the film S passes through the approximate center between the first and second ion generation electrodes in each static elimination unit.
Regarding the charge distribution of the film S that has been neutralized, the back surface equilibrium potential of the first surface was examined based on the above measurement method, and the charge density was determined. The fluctuation range of the charge density of the periodically charged portion of the original fabric A-1 and the original fabric A-2, and the range of the charge density of the uncharged portion (portion other than the charged portion) of the original fabric A-2 [unit: μC / M ² ] and the respective determination results are shown in Table 1.
[Comparative Example 1-1]
In the static eliminator 6 shown in FIG. 11, as the electrical insulating sheet S, the original fabric A-1 and the original fabric A-2 that are charged in the same manner as in Example 1-1, and the speeds shown in Table 1 are used. The film S was moved at u [unit: m / min].

As the first and second electrode units, an electrode unit 7 having an ion generating electrode provided with a needle electrode array 7a shown in FIG. 12 was used. The distance d _{S in} the width direction of the film S of the needle electrode array 7a was 12.7 mm. The needle electrode array 7a and the shield electrode 7b are insulated from each other by an insulating material (Teflon (registered trademark)) 7d. The first and second electrode units are installed above and below the film S so as to be orthogonal to the moving direction of the film S and parallel to the surface of the film S, and a static elimination unit It was. In the first and second electrode units, the moving direction and the width direction position of the film S at the tip of the needle were the same. The total number n of static eliminating units was 8.

  The tip of each needle electrode row, that is, the tip of each ion generating electrode of each electrode unit was arranged in a straight line in the width direction of the film S, and the deflection of the electrode was negligibly small.

Normal direction inter-electrode distance _d 1-1 _{to d 1-8} are all set to 25 mm, static eliminating unit intervals _d 2-1 _{to d 2-7} are all set to 30 mm, the width of the needle tip of the film S in each static eliminating unit The direction position was the same.
The first ion generation electrodes of each static elimination unit are all in phase, and the second ion generation electrodes of all static elimination units are all in phase, and are connected to the power supplies 6c and 6e connected to the first and second ion generation electrodes. Used an AC power supply with an effective voltage of 4 kV and a frequency of 60 Hz, and switched the input of the step-up transformer inside the power supply so that the phases were opposite to each other. All the shield electrodes 7b in the first and second electrode units of all static elimination units were grounded. The film S was allowed to pass through the approximate center between the first and second ion generation electrodes in each static elimination unit.

Regarding the charge distribution of the film S that has been neutralized, the back surface equilibrium potential of the first surface was examined based on the above measurement method, and the charge density was determined. The fluctuation range of the charge density of the periodically charged portion of the original fabric A-1 and the original fabric A-2 and the range of the charge density of the non-charged portion (portion other than the charged portion) of the original fabric A-2 [unit: μC / m ² ] and the respective determination results are shown in Table 1.
[Comparative Example 1-2]
As the electrically insulating sheet S, the original fabric A-1 and the original fabric A-2 that were charged in the same manner as in Example 1-1 were used, and the film was formed at a speed u [unit: m / min] shown in Table 1. S was moved. As the first and second electrode units, using a Kasuga Denki Co., Ltd. HER-type electrode, as shown in FIG. 10, the ion generating electrode _5d 1 _{~5d n,} the ion generating electrode _5f 1 _{~5f n} needle An electrode unit 8B that is an electrode array 8a and has a shield electrode and is not an “ion generation electrode exposure type” was used. The total number n of the static eliminating units is 8, and all the static eliminating units SU _{1 to} SU ₈ are configured by electrode units that have shield electrodes and are not “ion generation electrode exposed type”. In the first and second electrode units, the moving direction and the width direction position of the film S at the tip of the needle were the same. Static eliminating unit intervals _d 2-1 _{to d 2-7} were all 55 mm. Normal direction inter-electrode distance _d 1-1 _{to d 1-8} were all 40 mm.

In all static elimination units, the first ion generation electrode and the second ion generation electrode facing each other have opposite polarities with respect to a predetermined common potential (here, 0 [V]), and the difference in absolute value is A direct current voltage of 0.1 kV or less was applied. A positive DC voltage is applied to the first ion generating electrode of the odd (first, third, fifth, seventh) static elimination unit from the most upstream in the moving direction of the film S, and the potential difference between the ion generating electrodes becomes positive. Thus, a negative DC voltage is applied to the first ion generation electrode of the even (second, second, fourth, sixth, eighth) charge removal unit from the most upstream in the moving direction of the film S, and the potential difference between the ion generation electrodes is The negative polarity was achieved. The temporal average value of the absolute value of the applied voltage was 8 kV, that is, the absolute value of the potential difference between the ion generating electrodes was 16 kV. Note that no AC voltage was applied, and a DC voltage was applied to all the ion generation electrodes of the eight static elimination units. In addition, the first and second ion generation electrodes of all eight static elimination units are opposed to each other, and the electrode displacement amounts d _{0-1 to} d _0-8 in all static elimination units are arranged to be ₀ mm. .

Shield electrode _{5 g.} 1 to _{5 g} 8 of each electrode unit in all static eliminating _unit, 5h 1 _{~5h 8} are all grounded to the 0V potential, opening width _SOG 1 of the shield electrode of the electrode unit of the static eliminating units ~SOg ₈ and SOh _{1 to} SOh ₈ are all 18 mm, the shortest distances between the tip of each ion generation electrode and the shield electrode are all 12 mm, and the film S is substantially the center between the first and second ion generation electrodes in each static elimination unit. I tried to pass. Other conditions were the same as in Example 1-1. Regarding the charge distribution of the film S that has been neutralized, the back surface equilibrium potential of the first surface was examined based on the above measurement method, and the charge density was determined. The fluctuation range of the charge density of the periodically charged portion of the original fabric A-1 and the original fabric A-2, and the range of the charge density of the non-charged portion (portion other than the charged portion) of the original fabric A-2, Each determination result is shown in Table 1.
[Comparative Example 1-3]
In the configuration of Comparative Example 1-2, the second electrode unit EUf ₆ is moved in the moving direction of the film S in the moving direction of the film S so that the electrode displacement amount d _0-6 in the _sixth static eliminating unit SU ₆ is 25 mm. The other neutralization units were arranged so that the electrode deviation amount d _0-n (n = 1, 2, 3, 4, 5, 7, 8) was ₀ mm. Further, in each of the two static elimination units SU ₇ and SU ₈ arranged downstream with respect to the moving direction of the film S, the opposing first ion generation electrode and second ion generation electrode have 60 Hz of opposite polarities. An AC voltage was applied from an AC high-voltage power supply (PAD-101 type manufactured by Kasuga Electric Co., Ltd.), and the effective value was 7 kV. Further, 60 Hz AC voltages having opposite polarities were applied to the first ion generating electrodes 5d ₇ and 5d ₈ adjacent to each other in the moving direction of the film S, and the effective value thereof was 7 kV. Other conditions were the same as those in Comparative Example 1-2. Regarding the charge distribution of the film S that has been neutralized, the back surface equilibrium potential of the first surface was examined based on the above measurement method, and the charge density was determined. The fluctuation range of the charge density of the periodically charged portion of the original fabric A-1 and the original fabric A-2, and the range of the charge density of the non-charged portion (portion other than the charged portion) of the original fabric A-2, Each determination result is shown in Table 1.

* 1 The fluctuation of the charged part potential does not include the offset due to charging of the non-charged part. * 2 In Comparative Example 1-1, at a speed of 220 m / min, the charge density of the charged part is small and small. Since the portion appears at a period of about 60 mm, both values of the swing width at the portion with the large swing width and the swing width at the portion with the small swing width are shown.
[Summary of Experiment 1]
As shown in Table 1, in Example 1-1, at any speed, the charge density on each surface of the charged portion was significantly reduced (although the reduction amount was slightly reduced as the speed was increased). There is very little new charge. On the other hand, in Comparative Example 1-1 mainly composed of an AC static eliminator unit, there is a speed condition that can greatly reduce the charge density of the charging part and suppress new charging of the uncharged part. It can be seen that there is a portion where the decrease in charge density is small, and there is a speed at which the uncharged portion is charged significantly. For this reason, in Comparative Example 1-1, it was impossible to achieve both reduction in the charge density of the charged portion and new charge suppression of the non-charged portion in a wide speed range. Moreover, even if it comprises the same number of eight static elimination units from the comparative example 1-2 and comparative example 1-3 using the shield type static elimination unit of the example 1-1, the example 1-1 However, it can be seen that the static elimination capability has been remarkably improved. Since this does not have a shield electrode, it is prevented that the produced | generated ion leaks to earth | ground via a shield electrode, most produced | generated ions adhere to each surface of the film S, and it has a shield electrode. Compared to the case, the electric field between the ion generation electrodes facing each other becomes stronger, and in the generated ions, the acceleration force in the normal direction of the film S becomes stronger, and a lot of ions adhere to each surface of the film S. I believe that. It should be noted that the new charge to the uncharged portion is at a level where there is no problem in either case. Also, the output current to the ion generating electrode supplied from the power source, who Example 1 -1 becomes a half or less of the comparative example 1-2, requires also small output current capacity of the power supply. <Experiment 2: Demonstration of the effect of the polarity of the potential difference between the ion generating electrodes between adjacent static elimination units and the static elimination capability of the static elimination unit interval>
[Example 2-1]
In the configuration of Example 1-1, in the static elimination units SU _{1 to} SU ₆ having no shield electrode, the static elimination unit intervals d _{2-1 to} d _2-4 are all set to 30 mm, and d _2-5 and d _2-6. Was 42.5 mm, and the others were the same as those in Example 1-1. Regarding the charge distribution of the film S that has been neutralized, the back surface equilibrium potential of the first surface was examined based on the above measurement method, and the charge density was determined. Table 2 shows the fluctuation range of the charge density of the periodically charged portion of the original fabric A-2 and the range of the charge density of the non-charged portion (portion other than the charged portion) of the original fabric A-2. Show.
[Example 2-2]
In the configuration of Example 1-1, in the static elimination units SU _{1 to} SU ₆ having no shield electrode, the static elimination unit intervals d _{2-1 to} d _2-4 are all 70 mm, and d _2-5 and d _2-6. Was 82.5 mm, and the others were the same as those in Example 1-1. Regarding the charge distribution of the film S that has been neutralized, the back surface equilibrium potential of the first surface was examined based on the above measurement method, and the charge density was determined. Table 2 shows the fluctuation range of the charge density of the periodically charged portion of the original fabric A-2 and the range of the charge density of the non-charged portion (portion other than the charged portion) of the original fabric A-2. Show.

[Summary of Experiment 2]
From Examples 1-1, 2-1, and 2-2 shown in Table 2, in which the intervals between the static elimination units are different, when the potential difference between the ion generation electrodes adjacent to the movement direction of the film S is reverse polarity, the movement direction of the film S When the interval between the static elimination units adjacent to each other is smaller than 0.8 times the distance between the normal direction electrodes of each static elimination unit, the ions generated from each ion generation electrode are arranged on the same surface side with the film S interposed therebetween, Since it is easy to bind and neutralize with the reverse polarity ions generated from the ion generating electrodes adjacent in the moving direction of the film S, and the amount of ions adhering to each surface of the film S is reduced accordingly, in the moving direction of the film S It is confirmed that the neutralization capability is higher when the interval between adjacent neutralization units is larger than the distance between the normal electrodes of each neutralization unit. When the interval between the static elimination units is increased as in Example 2-2, the static elimination capability is slightly reduced as compared with Example 1-1, but on the other hand, the size of the apparatus in the sheet moving direction is increased, It is necessary to secure a sufficient installation space for the device. It should be noted that the new charge to the uncharged portion is at a level where there is no problem in either case.
<Experiment 3: Demonstration of the influence of the relationship between the static elimination unit interval and the distance between the normal direction electrodes on the static elimination capability>
[Example 3-1]
In the static elimination units SU _{1 to} SU ₆ constituted by the “ion generating electrode exposed type” electrode unit having no shield electrode in the configuration of Example 1-1, the static elimination units other than SU ₁ and SU ₂ are The voltage application was stopped and the potential difference between the ion generating electrodes was set to 0V. Further, the AC voltage application was also stopped for the AC static eliminator units SU ₇ and SU ₈ . Others were the same as Example 1-1. In addition, the length of the sheet width direction of each electrode unit is about 500 mm, and the length by which the ion generation electrode is arrange | positioned among them is about 400 mm. In this state, the static eliminating unit intervals _{d 2-1} of static eliminating units _SU 1, SU ₂ as fluctuation parameter, the raw A-2 is moved at 10 m / min, uncharged portion of the raw A-2 (charging FIG. 14 shows the result of examining the back surface equilibrium potential of the first surface based on the above-described measurement method, and the result of examining the indicated value of the output current meter associated with the used DC power source. Show.

[Summary of Experiment 3]
From the results of FIG. 14, the neutralization unit interval has the largest absolute value of the back surface equilibrium potential near the normal direction inter-electrode distance (40 mm), in other words, the amount of ion adhesion to the film surface increases, and the neutralization unit interval. If the value is further increased, the absolute value of the back surface equilibrium potential, that is, the amount of adhering ions decreases, but a substantially constant amount of adhering ions is obtained. In addition, as the static elimination unit interval is reduced, the absolute value of the back surface equilibrium potential, that is, the amount of adhering ions decreases, while the output current from the DC power supply increases significantly, that is, the film surface of the generated ions. It can be said that it is not preferable because the adhesion efficiency to the surface deteriorates.
<Experiment 4: Comparison of ion deposition efficiency between ion generation electrode exposed type and shield type>
[Reference Example 1-1]
In the configuration of Example 3-1, only the first static elimination unit composed of the “ion generation electrode exposure type” electrode unit is used, and a DC voltage is applied to each ion generation electrode in the other static elimination units. stop, static eliminating unit intervals _{d 2-1} of static eliminating units _SU 1, SU ₂ was constant at 40 mm. In addition, for the part of the ion generation electrode (each partial electrode) in the part where the film does not exist between the opposite ion generation electrodes, cover all the films so that the ions generated from the part do not reach the opposite ion generation electrode. Oita. Others were the same as Example 3-1. In this state, the original fabric A-2 is moved at a speed of 100 m / min, and the temporal average value of the absolute value of the DC applied voltage to each ion generating electrode in the first static elimination unit is used as the fluctuation parameter. The result of examining the back surface equilibrium potential of the first surface based on the above measurement method for the non-charged part (part other than the charged part) of A-2, and the instruction of the output current meter attached to the used DC power source The results of examining the values are shown in FIG.
[Reference Example 1-2]
In the configuration of Reference Example 1-1, each electrode unit of the first static elimination unit configured by the “ion generating electrode exposed type” electrode unit is a non- “ion generating electrode exposed type” electrode unit having a shield electrode. Configured. The arrangement of the shield electrode was the arrangement described in Comparative Example 1-2. Other conditions were the same as in Reference Example 1-1. In this state, when the raw fabric A-2 is moved at a speed of 100 m / min, and the temporal average value of the absolute value of the DC applied voltage to each ion generation electrode in the first static elimination unit is used as the fluctuation parameter, As a result of examining the back surface equilibrium potential of the first surface based on the above measurement method for the uncharged portion (the portion other than the charged portion) of the original fabric A-2, and the output current meter associated with the DC power supply used The results of examining the indicated values are shown in FIG.
[Summary of Experiment 4]
15 and 16, even if the potential difference between the ion generation electrodes is the same, the leakage current from the grounded shield electrode is more likely to be caused by using the static elimination unit composed of the “ion generation electrode exposed type” electrode unit. Therefore, the back surface equilibrium potential (that is, the amount of ions adhering to the film surface) can be increased by about 30% in a state where the output current supplied from the power source to the ion generating electrode is small. In addition, it can be said that it is preferable because the power source capacity can be reduced.

<Experiment 5: Comparison of residual charge amount of uncharged portion of sheet in various embodiments>
[Example 5-1]
As the electrical insulating sheet S, a raw fabric A-2 having the same charge as that of Example 1-1 was used. For the two static elimination units SU ₇ and SU ₈ arranged downstream in the configuration of Example 1-1, Application of AC voltage to the first and second ion generation electrodes was stopped. In this state, Table 3 shows the range of charge density and the determination result of the uncharged portion (portion other than the charged portion) of the original fabric A-2 after the film S is moved at 100 m / min and discharged.
[Example 5-2]
As the electrical insulating sheet S, a raw fabric A-2 having the same charge as that of Example 1-1 was used, and in the configuration of Example 5-1, the sixth static elimination unit arranged in the moving direction of the film S The electrode displacement amount d _0-6 of SU _{6 was set to 0} mm, the neutralization unit intervals d _2-5 and d _2-6 were set to 40 mm, and the other conditions were the same as in Example 5-1. In this state, Table 3 shows the range of charge density and the determination result of the uncharged portion (portion other than the charged portion) of the original fabric A-2 after the film S is moved at 100 m / min and discharged.
[Example 5-3]
As the electrical insulating sheet S, a raw fabric A-2 having the same charge as that of Example 1-1 was used. In the configuration of Example 5-2, the sixth static elimination unit SU _{6 in} the moving direction of the film S was used. Example 5-2 was the same as Example 5-2 except that the temporal average value of the absolute value of the DC applied voltage applied to the first ion generation electrode 5d ₆ and the second ion generation electrode 5f ₆ was set to 5 kV. In this state, Table 3 shows the range of charge density and the determination result of the uncharged portion (portion other than the charged portion) of the original fabric A-2 after the film S is moved at 100 m / min and discharged.
[Example 5-4]
As the electrical insulating sheet S, a raw fabric A-2 having the same charge as that of Example 1-1 was used. In the configuration of Example 5-2, the sixth static elimination unit SU _{6 in} the moving direction of the film S was used. It was the same as Example 5-2 except that only the normal direction interelectrode distance d _1-6 was set to 60 mm. In this state, Table 3 shows the range of charge density and the determination result of the uncharged portion (portion other than the charged portion) of the original fabric A-2 after the film S is moved at 100 m / min and discharged.
[Example 5-5]
As the electrical insulating sheet S, a raw fabric A-2 having the same charge as that of Example 1-1 was used, and the two upstream most static elimination units SU ₁ and SU ₂ in the moving direction of the film S were shield electrodes. The other ionization units SU _{3 to} SU ₈ are non- “ion generation electrode exposure type” electrode units having shield electrodes, and the others are the same as in Example 5-2. It was. In this state, Table 3 shows the range of charge density and the determination result of the uncharged portion (portion other than the charged portion) of the original fabric A-2 after the film S is moved at 100 m / min and discharged.
[Example 5-6]
As the electrical insulating sheet S, a raw fabric A-2 having the same charge as that of Example 1-1 was used. In the configuration of Example 5-2, two static elimination units SU arranged downstream in the moving direction of the film S were used. ₇ , an alternating voltage is applied to the first and second ion generation electrodes with respect to the SU ₈ , and the ion generation electrodes of the two static elimination units SU ₁ and SU ₂ from the uppermost stream in the moving direction of the film S The DC voltage application to was stopped and the other conditions were the same as in Example 5-2. In this state, Table 3 shows the range of charge density and the determination result of the uncharged portion (portion other than the charged portion) of the original fabric A-2 after the film S is moved at 100 m / min and discharged.
[Example 5-7]
As the electrical insulating sheet S, a raw fabric A-2 having the same charge as that of Example 1-1 was used. In the configuration of Example 1-1, two static elimination units SU ₁ from the most upstream in the moving direction of the film S were used. The DC voltage application to each ion generation electrode of SU ₂ was stopped, and the other conditions were the same as in Example 1-1. In this state, Table 3 shows the range of charge density and the determination result of the uncharged portion (portion other than the charged portion) of the original fabric A-2 after the film S is moved at 100 m / min and discharged.
[Summary of Experiment 5]
Even if the film S is neutralized using the same number of neutralization units, the charging may be increased although there is no problem level as in Example 5-2. “Ion generation” having a shield electrode that applies an AC voltage to the downstream static elimination unit among the static elimination units arranged in the moving direction of the film S as in 5-3 to 5-7, ensures an electrode displacement amount. The film S can be removed by devising to reduce the amount of ion adhesion to each surface of the film S, such as arranging an electrode unit that is not “electrode exposed type”, reducing the DC applied voltage, and increasing the distance between the normal electrodes. It can be confirmed that it is possible to improve the level of the new charge to the charged portion.

<Experiment 6: Comparison of static elimination ability and residual charge amount on uncharged portion of sheet by arrangement of polarity of potential difference between ion generating electrodes in each static elimination unit>
[Example 6-1]
The first ion-generating electrode from the upstream in the moving direction of the first, second, third and fourth th static eliminating unit SU ₁ to SU ₄ of the film S was applied a positive voltage of the DC, generated potential difference between the electrodes is positive ions In this state, a negative DC voltage is applied to the first ion generation electrodes of the fifth and sixth neutralization units SU ₅ and SU ₆ , the potential difference between the ion generation electrodes is negative, and the seventh neutralization unit Example 7 was the same as Example 1-1 except that the application of AC voltage to each ion generation electrode of SU ₇ and the eighth static elimination unit SU ₈ was stopped. When the film S is moved at a speed of 100 m / min, the fluctuation range of the charge density of the periodically charged portion of the original fabric A-2 and the range of the charge density of the uncharged portion of the original fabric A-2 are respectively determined. The results are shown in Table 4.

In addition, the locations of “polarity of potential difference between ion-generating electrodes” in Table 4 are shown from the left side to the right side in order from the upstream in the moving direction of the film S. For example, in the notation “++++++”, the potential difference between the ion generation electrodes is positive from the most upstream in the moving direction of the film S to the fourth static elimination unit, and the following (from the fifth to the eighth). The fourth) static elimination unit means that the potential difference between the ion generating electrodes is negative.
[Example 6-2]
A positive voltage is applied to the first ion generation electrodes of the first, _second , and _fifth neutralization units SU ₁ , SU ₂ and SU ₅ from the upstream in the moving direction of the film S, and the potential difference between the ion generation electrodes is positive. So that a negative voltage is applied to the first ion generation electrodes of the _third , _fourth , and _sixth static elimination units SU ₃ , SU ₄ , and SU _{6 so} that the potential difference between the ion generation electrodes becomes negative. The procedure was the same as Example 6-1 except for the above. When the film S is moved at a speed of 100 m / min, the fluctuation range of the charge density of the periodically charged portion of the original fabric A-2 and the range of the charge density of the uncharged portion of the original fabric A-2 are respectively determined. The results are shown in Table 4.
[Example 6-3]
A positive voltage is applied to the first ion generation electrodes of the _first and sixth static elimination units SU ₁ and SU ₅ from the upstream in the moving direction of the film S so that the potential difference between the ion generation electrodes becomes positive. A negative voltage was applied to the first ion generation electrodes of the _second , _third , _fourth , and _fifth neutralization units SU ₂ , SU ₃ , SU ₄ , and SU ₅ so that the potential difference between the ion generation electrodes became negative. Except for this, it was the same as Example 6-1. When the film S is moved at a speed of 100 m / min, the fluctuation range of the charge density of the periodically charged portion of the original fabric A-2 and the range of the charge density of the uncharged portion of the original fabric A-2 are respectively determined. The results are shown in Table 4.
[Comparative Example 6-1]
A positive voltage is applied to the first ion generation electrodes of the first to _sixth static elimination units SU _{1 to} SU 6 from the upstream in the moving direction of the film S so that the potential difference between the ion generation electrodes becomes positive. Was the same as in Example 6-1. When the film S is moved at a speed of 100 m / min, the fluctuation range of the charge density of the periodically charged portion of the original fabric A-2 and the range of the charge density of the uncharged portion of the original fabric A-2 are respectively determined. The results are shown in Table 4.
[Summary of Experiment 6]
From Examples 5-1, 6-1, 6-2, 6-3 and Comparative Example 6-1, more than 1/4 of the total number n (n = 6 in this example) of static eliminating units to which a DC voltage is applied In the embodiment, in the static elimination unit having two or more) static elimination units in which the potential difference between the ion generation electrodes is positive and negative, and the same polarity potential exists, the uncharged portion of the film S is rarely newly charged. I understand.

  On the contrary, as in Comparative Example 6-1, in each static elimination unit, when the potential difference between the ion generation electrodes is all the same polarity, it is understood that the uncharged portion of the film S is significantly charged, which is not preferable. . In addition, regarding the charge removal capability, it can be seen that, in each charge removal unit arranged adjacent to the sheet moving direction as in Example 5-1, a configuration in which the potential difference between the ion generation electrodes is opposite to each other is most preferable.

<Experiment 7: Demonstration of control of potential difference between ion generating electrodes according to sheet moving speed and thickness>
[Example 7-1]
In the configuration of Example 1-1, using the static eliminator having the configuration of FIG. Biaxially stretched polyethylene terephthalate film (original fabric B), 300 mm wide and 75 μm thick, biaxially stretched polyethylene terephthalate film (Lumirror 75T10 manufactured by Toray Industries, Inc., hereinafter referred to as “raw fabric C”), biaxially stretched polyethylene terephthalate film, 300 mm wide and 38 μm thick (Toray Industries, Inc. Lumirror 38S28 or less, hereinafter referred to as the original fabric D), a biaxially stretched polyethylene terephthalate film (Toray Industries, Ltd. Lumirror 12P60, hereinafter referred to as the original fabric E) having a width of 300 mm and a thickness of 12 μm, 10, 30, Each speed of 50, 100, 200, 300m / min The moved.

As the original fabrics B, C, D, and E, those having an absolute value of the back surface equilibrium potential of each surface of 30 V (charge density of 10 μC / m ² ) or less and being virtually uncharged were used.

Table 5 shows the back surface equilibrium potential and the charge density range of the original fabrics B to E after the static elimination at each speed, and the respective determination results.
[Example 7-2]
In Example 7-1, using the static eliminator having the configuration of FIG. 13, when the thickness of the film S is 50 μm or more, the time average value of the absolute value of the DC applied voltage is set to be reduced from 8 kV to 5 kV, That is, when the absolute value of the potential difference between the ion generating electrodes in each DC static elimination unit is set to be reduced from 16 kV to 10 kV, and the moving speed of each film S is 50 m / min or less, the absolute value of the DC applied voltage. Was set to zero kV, that is, the absolute value of the potential difference between the ion generation electrodes in each DC static elimination unit was set to 0 kV, and the DC applied voltage was controlled to stop. Table 5 shows the back surface equilibrium potential and the charge density range of the original fabrics B to E after the static elimination at each speed, and the respective determination results.

[Summary of Experiment 7]
As shown in Example 7-1, even when the static eliminator is operated under the same conditions, the amount of ions attached to each surface of the film S varies depending on the thickness of the film S and the moving speed of the film S. Therefore, depending on the moving speed condition of the film S and the thickness of the film S, the DC applied voltage is controlled as in Example 7-2 (the film S may be automatically controlled by the moving speed of the film S and the thickness of the film S). It can be switched manually by a human), that is, by controlling the potential difference between the ion generating electrodes, it is possible to suppress the new charge on each surface of the film S to a level that does not cause any problem under any conditions. This is a more preferable form depending on the moving speed of the film S and the thickness of the film S. (However, reducing the DC applied voltage or stopping the DC voltage application to reduce the potential difference between the ion generation electrodes in each DC static elimination unit will reduce the static elimination capability. Mutual judgment with ability is necessary.)

  The present invention is not limited to a static eliminator, but can be applied to an apparatus that is required to efficiently provide an equal amount of effect on the front and back and the entire surface of the object with the object sandwiched between narrow gaps. The range is not limited to these.

It is a schematic explanatory drawing of the static elimination apparatus by a prior art. It is a schematic explanatory drawing of the static elimination apparatus by a prior art. It is a schematic explanatory drawing of the static elimination apparatus by a prior art. It is a schematic explanatory drawing of the static elimination apparatus by a prior art. It is a schematic explanatory drawing of the sheet bonding apparatus by a prior art. It is a schematic explanatory drawing of the DC static elimination apparatus by a prior art. It is a schematic explanatory drawing of the apparatus which concerns on one Embodiment of this invention. It is a schematic explanatory drawing regarding the structure of the static elimination unit of one Embodiment of this invention. It is a schematic explanatory drawing regarding the structure of the static elimination unit of one Embodiment of this invention. It is a schematic explanatory drawing regarding arrangement | positioning of the static elimination units of one Embodiment of this invention. It is a schematic explanatory drawing regarding the structure of the static elimination unit of one Embodiment of this invention. It is a schematic explanatory drawing regarding the structure of the static elimination unit of one Embodiment of this invention. It is a schematic explanatory drawing of the apparatus which concerns on other embodiment of this invention. It is a schematic explanatory drawing which shows the mode of the charge of the original fabric (original fabric A-1, original fabric A-2) used for static elimination of Example 1-1 or less. It is a figure which shows distribution of the back surface equilibrium potential of the original fabric (original fabric A-1) used for static elimination of Example 1-1 or less. It is a schematic explanatory drawing which shows the structure of the electrode unit of one Embodiment of this invention. It is a schematic explanatory drawing of the static elimination apparatus by a prior art. It is a schematic explanatory drawing which shows the structure of the electrode unit of other embodiment of this invention. It is a schematic explanatory drawing of the apparatus which concerns on one Embodiment of this invention. It is explanatory drawing of the correlation of the ion adhesion amount concerning one Embodiment of this invention, and a static elimination unit space | interval. It is explanatory drawing of the correlation of the ion adhesion amount and output current in the "ion production electrode exposure type" electrode unit of this invention. It is explanatory drawing of the correlation of the amount of ion adhesion, and output current in the electrode unit by the prior art which is not an "ion generation electrode exposure type".

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Static elimination apparatus 1a AC power source 1b Ion generation electrode 1c AC power source 1d Ion attraction electrode 1e DC static elimination device 1f AC static elimination device S Electrical insulation sheet 2 Static elimination device 2a AC power source 2b Ion generation electrode 2c AC power source (reverse to 2a) phase)
2d Ion accelerating electrode 2e AC power source 2f Ion generating electrode 2g AC power source (opposite phase with 2e)
2h Ion accelerating electrode 100 First surface of electrically insulating sheet 200 Second surface of electrically insulating sheet 3 Static eliminator 3a Ion generating electrode 3b DC power source 3c Ion generating electrode 3d DC power source (opposite polarity with 3b)
3e Guide roll 4A Static elimination device 4a Ion generation electrode 4b AC power supply 4c Ion generation electrode 4d AC power supply (phase opposite to 4b)
4e Guide roll 4B Bonding device 4f DC power supply (positive voltage application)
4g DC power supply (negative voltage applied)
4h 1st ion generating electrode 4i 2nd ion generating electrode 300 Positive ion 400 Negative ion S1 Bonding sheet S2 Bonding sheet 4C DC neutralization device 4j Positive discharge needle 4k Negative discharge needle 4l End holder 4m Ground electrode 4n Ground electrode 4o Insulation block 4p Power cable 4q Power cable 5 Static neutralizer 5a Guide roll 5b Guide roll 5ab Sheet moving direction 5c DC power supply 5e DC power supply (opposite phase with 5c)
First shield electrode 5d _m sheet travel direction m-th first second ion generation electrode 5 g _m sheet moving direction m-th static eliminating unit of the ion generating electrode 5f _m sheet moving direction m-th static eliminating unit static eliminating unit 5h _m sheet travel direction m th second shield electrode 5d _p sheet travel direction p th first ion generation electrode 5f _p second ion generation electrode of sheet travel direction p th static eliminating units static eliminating unit static eliminating unit 5i 1st AC ion generating electrode 5j 2nd AC ion generating electrode 5k AC power source 5l AC power source (5k reverse phase)
The midpoint of the line segment connecting the tip of the first ion generating electrode and the tip of the second ion generating electrode of the p-th static elimination unit in the moving direction of the 5x _p sheet 5x _{p + 1 p + 1 in} the moving direction of the sheet Midpoint of the line segment connecting the tip of the first ion generating electrode and the tip of the second ion generating electrode of the static eliminating unit 6 Neutralizing device 6a Guide roll 6b Guide roll 6ab Sheet moving direction 6c AC power source 6e AC power source (6c and Reverse phase)
7 Electrode unit 7a Needle electrode array 7b Shield electrode 7d Insulating material 8 Electrode unit 8A Electrode unit without shield electrode 8B Electrode unit with shield electrode 8a Needle electrode array 8a _{One of} partial electrodes constituting _one needle electrode array 8a ₂ One of the partial electrodes constituting the needle electrode row 8b Shield electrode 8d Insulating material 8e Insulating material 8aL Polygonal line connecting needle tips provided at predetermined intervals in the sheet width direction d Space in the sheet width direction of the _five needle electrode rows SOg _m The first shield electrode opening width of the m-th neutralization unit in the sheet movement direction SOh _m The second shield electrode opening width of the m-th neutralization unit in the sheet movement direction d _0-m The electrode displacement amount in the m-th neutralization unit in the sheet movement direction d _0-6 electrode displacement in the sheet moving direction 6 th static eliminating unit amount d _1-m sheet moving direction Th normal direction inter-electrode distance d _2-p sheet travel direction p th static eliminating unit and p + 1-th moving direction first static eliminating unit SU ₇ movement direction of the sheet static eliminating unit interval SU ₁ sheet of static eliminating units static eliminating unit 7th static elimination unit SU ₈ sheet movement direction 8th static elimination unit SU _p sheet movement direction pth static elimination unit SU _{p + 1} sheet movement direction p + 1st static elimination unit SU _n sheet movement direction nth (most downstream) the first electrode of the static eliminating units EUd ₁ sheet first electrode unit EUd _{p + 1} sheet travel direction p + 1 th static eliminating unit in the moving direction p th static eliminating unit in the moving direction first first electrode unit EUd _p sheets of moving direction n th unit EUd _n sheet first electrode Uni static eliminating units (most downstream) DOO EUf ₁ sheet travel direction first second static eliminating unit electrode unit EUf _p sheet travel direction p-th second electrode units static eliminating unit EUf _{p + 1} sheet travel direction p + 1 th static eliminating unit second of of electrode unit EUf _n moving direction n th sheet second electrode unit a-a 'periodic charging unit arrow V _f rear side equilibrium potential of the static eliminating units (most downstream)

Claims (12)

It has at least two static elimination units spaced from each other in the movement direction of the sheet with respect to the movement path of the electrical insulating sheet, and each static elimination unit is disposed on the first surface side of the sheet. A first electrode unit and a second electrode unit disposed on the second surface side of the sheet, the first electrode unit having a first ion generation electrode, and the second electrode unit. The electrode unit is a static elimination device for an electrically insulating sheet having a second ion generation electrode disposed to face the first ion generation electrode,
(1) The at least one static elimination unit has a configuration in which both the first electrode unit and the second electrode unit are an ion generation electrode exposed type,
(2) In each of the above units, a direct-current and / or alternating-current ion generation electrode potential difference is applied between the first ion generation electrode and the second ion generation electrode.
(3) When the total number of the static elimination units is n (n is an integer of 2 or more), the ion generation in the static elimination units of n / 4 or more (rounded up after the decimal point) out of the n static elimination units. The neutralizing device for an electrically insulating sheet, wherein the interelectrode potential difference is a potential difference having a polarity opposite to that of the ion generating interelectrode potential difference in the other neutralizing unit. The total number n of the static elimination units is an even number, and the potential difference between the ion generation electrodes in the n / 2 static elimination units is a potential difference having a polarity opposite to the potential difference between the ion generation electrodes in the other static elimination units. The static elimination apparatus of the electrically insulating sheet | seat of Claim 1 characterized by these. 3. The electricity according to claim 1, wherein, in all of the static elimination units, the potential difference between the ion generation electrodes of the static elimination units adjacent in the moving direction of the sheet is a potential difference having opposite polarities. Insulating sheet static eliminator. In at least one set of the static elimination units adjacent to each other in the moving direction of the sheet, the potential difference between the ion generation electrodes of the at least one static elimination unit is opposite to each other, and the sheets of the at least one static elimination unit The interval between the static elimination units in the moving direction is 0.8 times or more the maximum value of the distance between the normal direction electrodes of any one of the at least one set of static elimination units, and is 2 times or less. It is comprised as follows. The static elimination apparatus of the electrically insulating sheet | seat in any one of Claims 1-3 characterized by the above-mentioned. In each of the static elimination units, the first ion generation electrode includes a plurality of first partial electrodes arranged in the width direction of the sheet, and is disposed adjacent to the width direction of the sheet. The distance between the first partial electrodes in the width direction of the sheet is smaller than 0.8 times the maximum value of the distance between the normal direction electrodes of the static elimination unit. A static eliminator for an electrically insulating sheet according to claim 1. The absolute value of the potential difference between the ion generation electrodes of the static elimination unit at least on the most downstream side in the moving direction of the sheet among the static elimination units is smaller than the absolute value of the potential difference between the ion generation electrodes of the other static elimination units. The electrical neutralization sheet neutralization device according to any one of claims 1 to 5, wherein The distance between the normal direction electrodes of the static elimination unit at least on the most downstream side in the moving direction of the sheet among each of the static elimination units is larger than the distance between the normal direction electrodes of the other static elimination units. The static elimination apparatus of the electrically insulating sheet in any one of 1-6. 8. The electrode displacement amount of the neutralization unit at least on the most downstream side in the moving direction of the sheet among each of the neutralization units is larger than the electrode displacement amount of the other neutralization units. The static elimination apparatus of the electrically insulating sheet of description. In each of the static elimination units, in at least one or more of the static elimination units, the static elimination unit has means for controlling the potential difference between the ion generation electrodes according to the moving speed of the sheet and / or the thickness of the sheet. The neutralizing device for an electrically insulating sheet according to any one of claims 1 to 8, wherein the device is a neutralizing device. The first ion generation electrode and the second ion generation electrode are configured to have a reverse polarity potential in all the static elimination units with respect to a predetermined common potential. Item 10. A static eliminator for an electrically insulating sheet according to any one of Items 1 to 9. Each static elimination unit includes at least one DC static elimination unit composed of the first ion generation electrode to which a DC potential difference is applied and the second ion generation electrode, and the at least one DC static elimination unit. An AC static eliminator unit having a first AC ion generation electrode and a second AC ion generation electrode that are arranged opposite to each other with the sheet sandwiched therebetween and downstream of the sheet in the moving direction. The at least one static elimination device for an electrically insulating sheet according to claim 1, wherein: It has at least two static elimination units spaced from each other in the movement direction of the sheet with respect to the movement path of the electrical insulating sheet, and each static elimination unit is disposed on the first surface side of the sheet. A first electrode unit and a second electrode unit disposed on the second surface side of the sheet, the first electrode unit having a first ion generation electrode, and the second electrode unit. The electrode unit of the present invention is a static-removed electrical insulating sheet that neutralizes an electrical insulating sheet by using a neutralizing device for the electrical insulating sheet having a second ion generating electrode disposed opposite to the first ion generating electrode. A manufacturing method of
(1) In at least one of the static elimination units of the static elimination unit, both the first electrode unit and the second electrode unit are configured to be an ion generation electrode exposed type,
(2) In each of the units, a direct-current and / or alternating-current ion generation electrode potential difference is applied between the first ion generation electrode and the second ion generation electrode,
(3) When the total number of the static eliminating units is n (n is an integer of 2 or more), among the n static eliminating units, n / 4 or more (rounded up after the decimal point) of the ion generating electrodes. The potential difference between the ion generation electrodes of each of the static elimination units is applied so that the potential difference between the ion generation electrodes in the other static elimination unit becomes a potential difference opposite in polarity to the potential difference between the ion generation electrodes.
A method for producing a static-removed electrical insulating sheet that neutralizes the electrical insulating sheet.

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