JP2008049297A - Electrostatic action control method and apparatus in electrostatic working environment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform an electrostatic work by certainly preventing an electrostatic deposition to a non-target surface facing an electrostatic working environment other than a target surface performing recovery and surface treatment by an electrostatic deposition of a raw material and a treatment material. <P>SOLUTION: The non-target surface 4 facing the electrostatic working environment 3 for performing the electrostatic work for releasing a charged release material 1, i.e., a charged raw material or treatment material to the target surface 2 having a potential difference relative to it to electrostatically deposit it to the target surface 2 gets an AC voltage V2 impressed with conductivity loaded by a metal material 12 to turn it uncharged. Thereby, the charged release material 1 is not electrostatically deposited. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is represented by, for example, an electrospinning technique in which a polymer fiber or the like as a raw material produced by an electron prevention system is collected on a target surface having a potential difference with this to form a continuous web. Electrostatic work that collects raw materials such as fibers, powders, and particles on the target surface by electrostatic adhesion, equipment, or surface treatment by electrostatically attaching treatment materials such as paint typified by electrostatic coating The present invention relates to an electrostatic action control method and apparatus in an electrostatic work environment in an electrostatic work or apparatus.

  The electrospinning technique is an alternative to mechanical extrusion, and as known in the following Patent Document 1 or the like, a polymer melt or solution is supplied as a material to a nozzle to flow out in a linear fashion. When the molecular solution is charged through the nozzle, the distance between the charged charges is reduced as the solvent of the polymer solution evaporates, and the Coulomb force that acts is increased, and the Coulomb force is increased on the surface of the linear polymer solution. The phenomenon that the linear polymer solution is stretched explosively when it is won by the tension is obtained, and this phenomenon called electrostatic explosion is repeated as primary, secondary, and tertiary. A so-called nanofiber is produced with a polymer fiber having a diameter of.

  By the way, for the practical application of the electrospinning technique, the present applicant was spun with an electrospinning system a that is a spinning container or a spinning nozzle as shown in FIG. 5 in consideration of spinning stability, productivity, yield, and the like. For example, a high voltage of about 10 kV to 100 kV is applied between the charged polymer fiber c and the collector d for collecting the charged polymer fiber c by a potential difference between the electrospinning system side voltage + V1 and the collector d side voltage −V3. Spinning is performed, and the produced charged polymer fiber c and the like are electrostatically attached to the surface of the collector d and collected. Further, in order to prevent the influence on the surroundings due to the application of such a high voltage, the electrostatic working environment as described above is surrounded by an acrylic resin enclosure wall e which is an insulating material, and the outer periphery is covered with a metal plate and grounded. connected to f.

  However, depending on this, we experienced that the discharge and spraying of the polymer fiber c and the like from the electrospinning system a into the enclosure wall e stopped or became unstable, and various experiments were conducted on this. As a result, it was found that the inner surface of the enclosure wall e made of an insulating material was charged with the same polarity as the electrospinning system a, and this was the cause. In addition, the metal plate on the outer surface of the enclosure wall e, instead of charging the enclosure wall e, functions to back up electrons of opposite polarity to the boundary surface with the enclosure wall e, thereby stabilizing the charged state. If it is attempted to increase the discharge and sprayability of the polymer fiber c by increasing the voltage, it may be due to the back-up electrons of the metal plate, but a discharge toward the enclosure wall e may occur.

On the other hand, electrostatic coating technology, which is an electrostatic work environment similar to electrospinning technology, prevents charged powder coating from adhering to the inner wall in the powder coating electrostatic coating chamber. It has been proposed to reduce the time required to replace the paint without having to clean over time (see, for example, Patent Document 2). Specifically, the invention provides an invention for a surface material for preventing powder adhesion, in which a plastic thin film such as a polyester film having a high electrical resistance is laminated on a foam molding resin such as a polystyrene foam having a high electrical resistance, It is disclosed that a resin material is better than using a metal material as a base material to be laminated with a polyester film, a foam material is better than a resin material or a non-foam material, and a foam material with a high foaming rate is better However, by adhering a cationized gas along the surface material for preventing the adhesion of powder, it is possible to prevent the adhesion of the powder and propose to use them as the wall material of the inner wall of the powder electrostatic coating chamber. is doing.
JP 2002-201559 A Japanese Patent Laid-Open No. 11-207849

  However, the powder adhesion preventing surface material described in Patent Document 2 does not prevent powder from adhering at all. Although the anti-adhesion effect is enhanced by flowing cationized air over the surface, the cationized air can flow evenly along the wall surrounding the specific electrostatic working environment such as the inner surface of the powder electrostatic coating chamber. Is difficult and does not prevent the adhesion of powder.

  Therefore, the present inventor examined the acrylic resin enclosure wall e, and bonded the copper tape to the inner surface and grounded it. As a result, the release property of the polymer fiber c spun from the electrospinning system a, spraying, etc. Improved. However, the polymer fiber c or the like adheres and accumulates on the ground connection side of the inner surface of the enclosure wall e, which causes dirt and a decrease in yield. Further, when the applied voltage was increased, discharge to the ground occurred.

  Through further experiments and examinations corresponding to this, a good result was obtained by a method and configuration that does not charge the inner surface of the acrylic resin enclosure wall e, and this technique is applied to the target surface by charge induction, fiber, short fiber, powder It can be applied to general electrostatic working environments in which raw materials such as bodies and particles and treatment materials are collected by electrostatic adhesion and surface treatment.

  In addition, the problem of electrostatic adhesion of the charged raw material and processing material to the surface other than the target surface as described above is that the target material having the target surface to be surface-treated is recovered by attaching them electrostatically. The surface also occurs in the same manner as the non-target surface formed by the inner surface of the enclosure wall that surrounds the electrostatic work environment.

  The object of the present invention is to ensure electrostatic adhesion to a non-target surface facing an electrostatic work environment other than the target surface to be recovered or surface-treated by electrostatic adhesion of raw materials and processing materials from such development results. It is an object of the present invention to provide an electrostatic action control method and apparatus in an electrostatic work environment capable of preventing electrostatic work.

  In order to achieve the above object, according to the first aspect of the present invention, a charged raw material or treatment material is discharged to a target surface having a potential difference from the charged raw material or treatment material and electrostatically is applied to the target surface. By applying an AC voltage to an electrically conductive non-target surface facing the electrostatic working environment, the charged raw material or processing material is not electrostatically attached. It is characterized by doing so.

  In the electrostatic action control method in such an electrostatic work environment, the raw material material or the treatment material charged in the electrostatic work environment is charged and electrostatically adhered to the target surface having a potential difference from the raw material material or the treated material. For the treatment, by applying an AC voltage to the conductive non-target surface facing the electrostatic work environment, the non-target surface is subjected to a substantial defect due to so-called neutralization by alternately changing the applied voltage positive and negative. It can keep positively charged. For this reason, it does not interfere with the charged release of the raw material or treatment material due to the influence of the raw material or treatment material being charged, and the raw material or treatment material charged on the non-target surface Can sufficiently prevent electrostatic adhesion. However, the continuity of the conductive surface is not always essential for this.

  According to a sixth aspect of the present invention, there is provided an electrostatic working means for discharging and electrostatically attaching a charged raw material or processing material to a target surface disposed with a potential difference from the charged raw material or processing material. , A metal material that makes the non-target surface facing the electrostatic work environment by this electrostatic working means conductive, and an AC voltage that applies an AC voltage to this metal material and makes the non-target surface formed by it non-charged This is realized by an electrostatic action control device in an electrostatic work environment characterized by comprising an applying means and a control means for operating an AC voltage applying means based on the start of electrostatic work by the electrostatic working means. In addition, even if the metal surface that imparts conductivity to the non-target surface is a metal mesh or punched metal plate, etc., and the conductive surface is discontinuous, the charged raw material or processing material is not electrostatically attached. Can be exhibited over the entire area of the metal material on the non-target surface. The same applies to the case where metal materials are arranged at small intervals.

  According to the second aspect of the present invention, the non-target surface to be uncharged in the first aspect is a non-target surface of an object having an enclosure wall or target surface surrounding the electrostatic work environment. It is characterized by doing. As a result, an object or enclosure having a target surface that faces the electrostatic work environment in order to receive electrostatic adhesion of raw materials or processing materials in the electrostatic work environment or to surround the electrostatic work environment. Regardless of the non-target surface formed by the wall, it is possible to prevent the raw material and the processing material from electrostatically adhering as an uncharged state by applying conductivity and applying an AC voltage as necessary. In particular, the enclosure wall made of an insulating material can prevent electrical influences on the surroundings even when a high voltage is applied in an electrostatic work environment, and is affected by the raw materials and processing materials released by charging. Therefore, it does not stop or cause the release of the raw material and the treatment material accompanied by charging.

  In such a method, according to the seventh aspect of the present invention, the metal material to which the AC voltage is applied is an insulating object having an enclosure wall or an object surface made of an insulating material surrounding the electrostatic work environment. This is realized by an electrostatic action control device in an electrostatic work environment characterized by imparting conductivity to a non-target surface of an object.

  According to the third aspect of the present invention, the non-target surface of the surrounding wall that is to be uncharged is targeted at least in the side circumferential region facing the discharge direction of the raw material or the processing material. As a result, the source material and the processing material are disposed on the emission source side for discharging the raw material material and the processing material of the non-target surface formed by the enclosure wall with charging, and on the emission side where the target object is disposed opposite to the emission source side. Contrary to the fact that there is no problem due to electrostatic adhesion of materials, the material and treatment materials are not charged due to the application of AC voltage using conductivity only in the side area where the materials and treatment materials are likely to be electrostatically attached and easily affect the charging. To prevent the electrostatic discharge of charged raw materials and processing materials and the discharge of raw materials and processing materials accompanied by charging due to the influence of charging of the raw materials and processing materials. Can be prevented.

  In such a method, according to the eighth aspect of the present invention, the metal material to which an AC voltage is applied is conductive at least in the side circumferential region of the inner surface of the enclosure wall facing the discharge direction of the raw material or the treatment material. It is realized by an electrostatic action control device in an electrostatic work environment that imparts a property.

  According to the fourth aspect of the present invention, the electrostatic work environment is a collection of raw materials such as fibers, short fibers, powders, particles, and the like, electrostatic coating on a target surface using a paint as a treatment material, It is characterized by performing electrostatic flocking on a target surface using a pile as a treatment material, and collecting any one of electrostatic material flocking, electrostatic coating, and electrostatic flocking by electrostatic adhesion to the target surface It is possible to prevent the raw material and the processing material from electrostatically adhering to the non-target surface facing the electrostatic working environment at the time of work or disturbing the discharge of the raw material and the processing material accompanied by charging.

  In such a method, according to the ninth aspect of the present invention, the electrostatic working means collects the target surface of the raw material material that is fiber, short fiber, powder, particle, and the target surface using the paint as the processing material. This is realized by an electrostatic action control device in an electrostatic working environment that performs electrostatic coating on the surface and one of electrostatic flocking on a target surface using pile as a treatment material.

  According to a fifth aspect of the present invention, the raw material is a charged polymer fiber, short fiber, powder, or particle produced by an electrospinning method. As a result, when high voltage is applied to create and collect nano-level polymer fibers and particle raw materials, the electrical influence on the surroundings and the generated raw materials adhere electrostatically to non-target surfaces. Thus, it is possible to avoid such things as depositing, lowering of the recovery rate, or preventing the discharge of the raw material and processing material accompanied by charging.

  In such a method, according to the tenth aspect of the present invention, the electrostatic working means comprises an electrospinning means and charged polymer fibers, short fibers, powders, and particles produced from the electrostatic spinning means. It implement | achieves by the electrostatic work control apparatus in the electrostatic work environment provided with the target object which has the object surface to collect | recover.

  Further objects and features of the present invention will become apparent from the following specific description and drawings.

  According to the present invention, a non-target surface facing an electrostatic work environment in which a charged raw material or treatment material is electrostatically attached to a target surface having a potential difference from the charged material material and is recovered or surface-treated is substantially uncharged. To prevent electrostatic adhesion of charged raw materials and processing materials, avoid problems due to deposits and troublesome removal, and at the same time collect and process the target surface efficiently. Can be enhanced. Therefore, it is made of an insulating material that surrounds the electrostatic work environment in order to prevent influence on the non-target surface of the target object to be collected or processed by electrostatic adhesion of the raw material or processing material, or when high voltage is applied. It is effective for any non-target surface formed by the enclosure wall, and the enclosure wall does not interfere with the discharge of the charged raw material and processing material due to the influence of the charged raw material and processing material. Electric work can be performed stably. Further, there is an advantage that the electrostatic working device is not particularly complicated or enlarged, and does not cause an increase in cost.

  Hereinafter, the electrostatic action control method and apparatus in the electrostatic working environment according to the present embodiment will be described with reference to FIGS. 1 to 4 for the understanding of the present invention.

  The electrostatic action control method and apparatus in the electrostatic working environment according to the present invention is a polymer fiber, short fiber, powder, particle produced by stretching, miniaturization, and particle formation by electrostatic explosion in the above-described electrospinning technology. Is electrostatically attached to the target surface as a raw material, or is treated as a processing material by electrostatically attaching to the target surface such as various articles made of resin or metal or building walls. In particular, in the process of recovering the polymer fiber, a polymer web having a predetermined width is manufactured as described in Patent Document 1, or the continuous high height already known in Japanese Patent Application Laid-Open No. 2006-507428 (Patent Document 3) is used. They can be combined with filaments or twisted yarns that are molecular fiber bundles. Therefore, raw materials and treatment materials are various polymer materials for electrospinning already known from Patent Document 1 such as polyvinylidene fluoride (FVDF), poly (vinylidene fluoride-co-hexafluoropropylene), polyacrylonitrile. , Poly (acrylonitrile-co-methacrylate, polymethyl methacrylate, polyvinyl chloride, poly (vinylidene chloride-co-acrylate), polyethylene, polypropylene, nylon 12, nylon-4, 6 and other nylon series, aramid, polybenzo Imidazole, polyvinyl alcohol, cellulose, cellulose acetate, cellulose acetate butyrate, polyvinylpyrrolidone-vinyl acetate, poly (bis- (2-methoxy-ethoxyethoxy)) phosphazene (MEEP)), polyethyleneimide (PEI) , Poly (ethylene succinate), poly ( Ethylene), poly (oxymethylene-oligo-oxyethylene), poly (propylene oxide), poly (vinyl acetate), polyaniline, (polyethylene terephthalate), poly (hydroxybutyrate), poly (ethylene oxide), SBS copolymer Various polymers such as biopolymers such as polylactic acid, polypeptides and proteins, pitch systems such as coal tar pitch and petroleum pitch can be applied, and copolymers and mixtures thereof can also be applied. It is possible to use other materials known in the art. As the solvent, any solvent that dissolves these polymers can be used. However, the present invention is not limited to this, and charge induction of raw materials and treatment materials such as electrostatic painting and electrostatic flocking, which are known in Patent Document 2 and the like, which are similar to electrostatic work and electrostatic work environment. It can be applied to general electrostatic work such as recovery and surface treatment with electrostatic adhesion.

  The electrostatic action control method in the electrostatic working environment according to the present embodiment is, as illustrated in the schematic diagram of FIG. 1, a raw material such as charged polymer fiber, short fiber, powder, particle, or the like. The treatment material is used as the charge release material 1 and discharged to the target surface 2 having a potential difference by connecting to the charge or ground, and the discharged charge release material 1 is electrostatically attached to the target surface 2 by charge induction. In order to perform the electrostatic work for recovery or surface treatment, an AC voltage V2 is applied to the conductive non-target surface 4 that is not the target surface 2 facing the electrostatic work environment 3 in which this electrostatic work is performed, and an uncharged state Thus, the basic feature is to prevent the electrostatic discharge material 1 from electrostatically adhering to the non-target surface 4. As described above, in the electrostatic work in which the electrostatic discharge material 1 is discharged in the electrostatic work environment 3 and the charge is induced on the target surface 2 having a potential difference from the charge release material to be electrostatically attached and recovered or surface-treated. By applying the AC voltage V2 to the conductive non-target surface 4 facing the work environment 3, the positive and negative charges applied to the non-target surface 4 are alternately affected without being affected by the charged discharge material 1 being charged. It can be positively maintained in a substantially uncharged state due to a so-called neutralization effect by changing to. Thereby, it is possible to sufficiently prevent the electrostatic discharge material 1 from electrostatically adhering to the non-target surface 4.

  The electrostatic action control apparatus in the electrostatic working environment shown in FIG. 1 of the present embodiment realizes such a method by charging the electrostatic discharge system 100 with polymer fibers, short fibers, powders, Electrostatic working means 11 that discharges the electrostatic discharge material 1 that is a raw material material such as particles or processing material to the target surface 2 arranged with a potential difference from this and electrostatically adheres to this, and the electrostatic working means 11 A metal material 12 for imparting conductivity to the non-target surface 4 facing the electrostatic working environment 3, and an AC voltage applying means 13 for applying an AC voltage V2 to the metal material 12 on the non-target surface 4 to make it uncharged. The control means 14 is provided with the AC voltage application means 13 based on the electrostatic work start by the electrostatic work means 11.

  The electrostatic working means 11 is a charging power source 16a as a charging means for charging the raw material and processing material discharged from the electrostatic discharge system 100 to the charge V1, and a charging means for charging the target surface 2 to the charge V3. Charging power source 16b. In the illustrated example, the polymer solution is pumped to the nozzle-type electrostatic discharge system 100 by a pump (not shown) and sprayed as the charge release material 1, and the target surface is refined and granulated into nano-units by multiple electrostatic explosions. 2 shows a case where surface treatment is performed, and in particular, by applying a voltage from the charging power source 16a to the electrode wire 100a made of stainless steel inserted in the nozzle type electrostatic discharge system 100, a high charge is applied to the charge release material 1. It can be applied, and the degree of electrostatic explosion is increased and the electrostatic adhesion to the target surface 2 is enhanced. The charging power source 16b applies the voltage V3 to the target surface 2, but the same effect can be obtained by connecting the target surface 2 to the ground instead. The electrode wire 100a is not limited to stainless steel, and may be an electrode wire such as tungsten.

  Here, the potential difference between the voltages V1 and V3 is preferably about 10 kV to 100 kV. Further, the AC voltage applying means 13 is a substantially non-charged state by vibrational reversal of the positive and negative electrodes when an AC voltage is applied to the non-target surface 4 that is made conductive. It can be neutralized and eliminated. However, the frequency of the AC voltage to be applied is preferably set high for the neutralization action, and is preferably set to about 1 Hz to 100 kHz with respect to the range of the electrostatic working voltage, and the voltage is about 10 V to 500 V. It is suitable to set. On the other hand, the waveform of the applied AC voltage V2 is not particularly limited, and may be a sine wave or a rectangular wave as shown in FIG. 2 or a triangular wave as shown in FIG.

  The target surface 2 may be formed in various ways depending on the type of the target object 200 having the target surface 2, and a charging structure corresponding to the type may be adopted. For example, in the case of the entire surface of a metal product, the voltage V3 may be simply applied to the object 200 or connected to the ground. In the case of a dielectric such as a resin product, the voltage V3 is charged by charging means or the object surface 2 What is necessary is just to apply the voltage V3 or to connect to the ground by imparting conductivity to. In this way, when the entire surface of the object 200 is the object surface 2, the non-object surface 4 is not provided, but if it is a part of the surface only on the side facing the electrostatic discharge system 100, other surfaces are non-surface. The target surface 4 becomes the target surface 200, and the non-target surface 4 is hung on the support member or faces downward, and there is no problem due to the wraparound of the charge release material 1 or its influence. If it is necessary to prevent electrostatic adhesion of the charge release material, if the AC voltage V2 is not applied as the conductive non-target surface 4 that is insulated from the charged area on the target surface 2, it will be the target surface 2 Adversely affects. In the object 200 made of an insulating material such as resin, it is easy to form the object surface 2 with a conductive member and apply the voltage V3 or to ground it. In any case, in order to apply the alternating voltage V2 with the non-target surface 4 being conductive, it is necessary to insulate the target surface 2 from the charged region.

  In addition, when the target surface 2 is an object 200 to be collected using the charge release material 1 as a raw material, if the rotating surface shown in FIG. 4 or a rotating belt instead of the rotating body shown in FIG. However, it is suitable because it can be transported to the next, and if necessary, the polymer fiber in the electrospinning method is collected and deposited on the web and sent out, or as a sliver process or filament process, or as a sliver, filament process, It can be sent out with converging as a pre-process such as yarn production. The object 200 shown in FIG. 4 is intended for spinning by collection, and is continuously applied to the target surface 2 that circulates with a limited width around the electrostatic discharge material 1 electrostatically spun from the electrostatic discharge system 100. Collected and fed to the front while converging, and continuously pulling it up from the target surface 2 to form a continuous sliver-like or filament-like thread, or use a secondary product as it is or by twisting or twisting the twisted yarn It is intended to be used. Since the material of the object 200 is not limited, the object surface 2 is fitted with or wound around the outer periphery of the object 200 while being reduced in weight and cost as a resin. The voltage V3 can be applied from the charging power source 16b, and the non-target surface 4 of the target object 200 is placed at an insulation distance from the metal material 12 of the target surface 2 or is insulated by the target object 200 itself. It is possible to prevent the charging / discharging material 1 from adhering by applying the AC voltage V2 from the AC voltage application means 13 and making it conductive. Of course, the target surface 2 for collecting the charge releasing material 1 shown in the figure is a thin disc, and the both sides of the outer periphery of the target object are projected in a bowl shape so that the charge releasing material 1 wraps around the non-target surface 4 of the target object 200. It has become difficult. However, the non-target surface can be treated in the same manner including all surfaces such as the surface of the rotating shaft facing the electrostatic working environment 3.

  As shown in FIG. 1, it is preferable that the electrostatic work environment 3 is surrounded by the enclosure wall 15 because scattering around the charge release material 1 can be prevented. As described above, the electrostatic work voltage is about 10 kV to 100 kV. In the case of a high voltage, it is preferable to use an insulating material for the surrounding wall 15 in order to prevent electrical influence on the surroundings. However, the inner surface is the non-target surface 4, but as described above, the discharge of the charge release material 1 from the electrostatic discharge system 100 stops due to the influence of the charge release material 1 or becomes unstable. Since the discharged charge releasing material 1 is electrostatically attached to cause a problem, the conductive material is imparted to the problem area by the metal material 12 and an AC voltage V2 is applied so that the charge releasing material 1 is not electrostatically attached. It is essential to do.

  Here, it is preferable that the necessary area of the non-target surface 4 exhibits a continuous non-charging property with respect to the charged release material 1, but the continuity of the conductive surface is not necessarily essential. Specifically, the metal material 12 shown in FIG. 1 is a continuous copper plate, and the non-target surface 4 is formed as a continuous non-charged surface by application of the AC voltage V2, but the metal material 12 is used as a wire mesh or a punching metal plate. Even when the conductive surface becomes discontinuous, an unchargeable band that does not cause the electrostatic discharge material 1 to adhere electrostatically to the non-target surface 4 is continuously obtained, and the inner surface of the surrounding wall 15 passes through a mesh or punching hole. There is no electrostatic adhesion. However, there are limitations on the size and pitch of the mesh and punching holes.

  Here, the enclosure wall 15 is not indispensable depending on the type of electrostatic work and the work place. Even if the enclosure wall 15 surrounding the electrostatic work environment 3 is provided, the electrostatic discharge material 1 is not electrostatically attached far from the electrostatic work position. In some cases, even if electrostatic adhesion is allowed. In addition, the target object 200 having the entire target surface 2 does not have the non-target surface 4, and the target 200 having the non-target surface 4 is an environment in which the wraparound adhesion of the charge release material 1 to other than the target surface 2 does not occur. Even if there is wraparound adhesion, it may be allowed. Therefore, the imparting of conductivity to the non-target surface 4 is performed by applying an AC voltage to the non-target surface 4 of the target object 200 having the enclosure wall 15 and the target surface 2 made of an insulating material surrounding the electrostatic work environment 3. It is only necessary to apply V2.

  Further, on the non-target surface 4 of the enclosure wall 15 on the side where the charge release material 1 is discharged with charging, that is, on the emission source side 4a where the electrostatic discharge system 100 is installed, the charge release material 1 is reduced to a minimum. Because of the relationship of discharging in a direction away from the range, the charging / discharging material 1 does not flow backward and does not wrap around, and there is no problem of minute and electrostatic influence. Further, on the discharge target side 4b where the target 200 having the target surface 2 that is the target of discharge of the electrostatic discharge material 1 from the electrostatic discharge system 100 is installed, almost the majority of the discharged charge release material 1 is the target surface 2. In many cases, the electrostatic discharge material 1 is difficult to reach, and even if it arrives, a small amount of the charge is dropped and there is no problem of electrostatic influence. Therefore, with respect to the non-target surface 4 of the enclosure wall 15, the conductivity imparting to the non-target surface 4 of the enclosure wall 15 is limited to the metal material 12 at least in the side peripheral region facing the discharge direction of the charge release material 1. If provided, the countermeasure against the problem due to the charging of the surrounding wall 15 is practically sufficient.

It is a model diagram which shows one example of the electrostatic-action control method and apparatus in the electrostatic working environment of embodiment which concerns on this invention. It is a specific figure which shows the application state of the alternating voltage by the sine wave and rectangular wave used with the method and apparatus of the example of FIG. It is a wave form diagram which shows the example of the triangular wave of alternating voltage. It is a model diagram which shows the example in case the objective is collection | recovery of the raw material by the method and apparatus shown in FIG. It is a schematic diagram which shows one example of the electrostatic effect control method and apparatus in the conventional electrostatic working environment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Charge release material 2 Target surface 3 Electrostatic work environment 4 Non-target surface 11 Electrostatic work means 12 Metal material 13 AC voltage application means 14 Control means 15 Enclosure walls 16a and 16b Charge power supply 100 Electrostatic discharge system 200 Object

Claims (10)

Conductive non-target surface facing an electrostatic work environment in which charged raw material or processing material is discharged to the target surface having a potential difference and electrostatically attached to the target surface. A method of controlling electrostatic action in an electrostatic work environment, wherein an AC voltage is applied to the substrate to make it uncharged to prevent electrostatic charging of raw material or processing material. The electrostatic action control in the electrostatic work environment according to claim 1, wherein the non-target surface to be uncharged is a target wall surface surrounding the electrostatic work environment or a non-target surface of an object having the target surface. Method. 3. The electrostatic action control method in an electrostatic work environment according to claim 2, wherein the non-target surface of the enclosure wall to be in an uncharged state targets at least a side peripheral region facing the discharge direction of the raw material or processing material. The electrostatic work environment consists of collection of raw materials such as fibers, short fibers, powders and particles on the target surface, electrostatic coating on the target surface using paint as a treatment material, and static application on the target surface using pile as a treatment material. The electrostatic action control method in the electrostatic work environment of any one of Claims 1-3 which performs one of the electric flocking. 5. The electrostatic action control method in an electrostatic work environment according to claim 4, wherein the raw material is a charged polymer fiber, short fiber, powder or particle produced by an electrospinning method. Electrostatic working means for discharging and electrostatically adhering a charged raw material or processing material to a target surface arranged with a potential difference from this, and a non-target surface facing the electrostatic working environment by this electrostatic working means Based on the start of the electrostatic work by the electrostatic working means, the alternating current voltage applying means for applying an alternating voltage to the metallic material to make the non-target surface formed by the metallic material an uncharged state, and the electrostatic working means. An electrostatic action control device in an electrostatic work environment, comprising: control means for operating voltage application means. The electrostatic work environment according to claim 6, wherein the metal material imparts conductivity to an enclosure wall made of an insulating material surrounding the electrostatic work environment or a non-target surface of an insulating object having a target surface. Electrostatic action control device. The metal material to which an alternating voltage is applied imparts conductivity to at least a side peripheral area of the inner surface of the enclosure wall facing the discharge direction of the raw material or treatment material. The electrostatic action control apparatus in the described electrostatic working environment. The electrostatic working means can be used to collect raw materials such as fibers, short fibers, powders and particles from the target surface, electrostatic coating on the target surface using paint as a treatment material, and static coating on the target surface using pile as a treatment material. The electrostatic action control apparatus in the electrostatic work environment of any one of Claims 6-8 which performs one of the electric flocking. 10. The electrostatic working means comprises an electrospinning means and an object having a target surface for collecting charged polymer fibers, short fibers, powder, and particles produced from the electrostatic spinning means. The electrostatic work control apparatus in the electrostatic work environment described in 1.

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