JP2719091B2 - Static electricity removing device and static electricity removing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static eliminator and a static eliminator for removing static electricity from a charged film or paper.

[0002]

2. Description of the Related Art Various obstacles due to static electricity have occurred in workplaces handling films such as film production and processing. The main obstacles are contaminated with dust and dirt. Sparks ignite flammable chemicals.
The film wraps around the roller. and so on. In order to prevent such troubles, measures have been taken to remove static electricity from a charged film using a static eliminator.

FIG. 6 shows the configuration of a conventional static eliminator. A conventional static eliminator includes an X-ray tube 101 that irradiates a gas such as air with X-rays to generate an ion gas, and a blower 103 that blows the generated ion gas onto one surface of a film 102.
And By using this apparatus to blow an ion gas onto one surface of the film 102, the film 102 can be discharged.

[0004] The method of generating ion gas includes an X-ray tube 1
In addition to the method using 01, there is a method in which a high voltage is applied to a sharp needle-shaped discharge needle arranged near an electrode for grounding, and the surrounding gas is ionized by corona discharge in the discharge needle.

FIG. 7 shows a configuration example of a film winding device provided with such a conventional static eliminator. In this example, the static eliminators 104 to 106 are arranged at two places on the front side of the film 102 and one place on the back side to remove the charge of the film 102.

[0006] In addition, a technical document in Japanese Patent Application Laid-Open No. 64-47856 discloses a method for removing electricity from a film having a metal thin film formed on a surface thereof. This static elimination method is different from the conventional static elimination method described above in that a metal thin film is irradiated with X-rays,
The charge of the film is removed by secondary electron emission.

[0007]

The conventional static eliminator uses a blower 103 to convert ion gas into a film 10.
2, only one surface of the film 102 could be neutralized. Therefore, in order to eliminate charges on both sides of the film 102, at least two charge eliminating devices must be provided on the front and back of the film 102 as shown in FIG.

Further, in an apparatus using a method of generating an ion gas by corona discharge without using the X-ray tube 101, the influence of high voltage due to corona discharge, generation of scratches on the film due to discharge, and generation of corona discharge There were problems such as generation of dust from the electrodes.

Further, since the surface of the film 102 has a high resistance, the partially generated strong charging potential
The conventional method in which ion gas is blown by using 03 cannot be completely removed. This is the film 102
This is because some of the positive ions and some of the negative ions in the ion gas are recombined before reaching the surface.

SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and to provide a static eliminator and a static elimination method capable of effectively removing the charge.

[0011]

In order to solve the above-mentioned problems, an electrostatic eliminator according to the present invention comprises a guide section for inserting a long object to be neutralized and moving in a longitudinal direction, and an object introduced into the guide section. An X-ray tube which is arranged perpendicular to the surface of the object to be neutralized and irradiates the gas in contact with the object to be neutralized with X-rays;
An envelope that covers at least a portion to be irradiated with X-rays from the X-ray tube.

Further, in the static electricity elimination method of the present invention, X-rays are irradiated almost uniformly in a direction intersecting the longitudinal direction of the object to be neutralized, and a gas in contact with the irradiated surface of the object to be neutralized is ionized. This is a method in which the charge of the charged gas is combined with the charge of the charge-removed object to remove the charge.

[0013]

According to the static electricity eliminator of the present invention, the X-rays emitted from the X-ray tube are applied to the gas in contact with the surface of the object to be neutralized introduced into the guide portion on the X-ray tube side. Further, the X-rays pass through the object to be neutralized and are also applied to the gas in contact with the surface of the object to be neutralized opposite to the X-ray tube side. For this reason, the gas in contact with both surfaces of the object to be neutralized is ionized, and the charge of the object to be neutralized is combined with the electric charge of the ionized gas. By this coupling, both surfaces of the object to be neutralized are simultaneously neutralized. Also,
The envelope covers the portion of the object to be irradiated which is irradiated with X-rays from the X-ray tube, so that scattering of ions generated around the irradiated portion is prevented, and the residence time of the ions is lengthened. . In addition, when the X-ray tube is arranged inside the envelope, the envelope prevents leakage of X-rays to the outside.

Further, according to the static electricity elimination method of the present invention,
Since the X-rays are irradiated almost uniformly in a direction intersecting the longitudinal direction of the object to be neutralized, the gas in contact with the irradiation surface of the object to be neutralized is ionized. Further, since the X-rays pass through the object to be neutralized and are also applied to the gas in contact with the back surface of the irradiation surface, the gas in contact with the back surface of the irradiation surface is also ionized. For this reason, the charge of the ionized gas and the charges charged on both surfaces of the object to be neutralized are combined, and both surfaces of the object to be neutralized are simultaneously discharged.

[0015]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view illustrating the configuration of the static eliminator according to the present embodiment. As shown in the figure, the static electricity eliminator of the present embodiment has rollers 20, 21 as guides for moving the belt-shaped vinyl film 10 in the longitudinal direction.
X to irradiate the vinyl film 10 with X-rays from above
The X-ray tube 30 includes an X-ray tube 30 and an X-ray shielding cabinet 40 that covers the X-ray irradiated portion of the X-ray tube 30 and the vinyl film 10 and prevents leakage of X-rays to the outside. The inside of the X-ray shielding cabinet 40 is filled with air or gas.

In the present embodiment, the description will be given of the charge removal of the vinyl film 10. However, the present invention is not limited to the charge removal of the vinyl film 10, but can also remove the charge of the band-shaped paper.

As shown in FIG. 2A, the X-ray tube 30 is
It has a cylindrical base 31, a target film 32 formed on the inner surface of the base 31, and a cathode 33 provided inside the base 31. The operation principle of the X-ray tube 30 is as follows. When a high potential is applied to the cathode 33 by the supply of power from the power supply device 50 provided outside, electrons are emitted from the cathode 33. The electrons collide with the target film 32 to generate X-rays, and the X-rays are irradiated on the vinyl film 10. The material of the base 31 is, for example, beryllium, the material of the target film 32 is, for example, titanium, and the material of the cathode 33 is, for example, tungsten.

As shown in FIG. 2B, an X-ray tube 34 having a hemispherical tip may be used instead of the X-ray tube 30 having a cylindrical shape. The X-ray tube 34 can also emit X-rays based on the same operation principle as the X-ray tube 30.

Further, as shown in FIGS. 3A and 3B, X
A configuration in which a plurality of wire tubes 35 are arranged may be used. The X-ray tube 35 generates X-rays when electrons emitted from the cathode 36 collide with the target 37. X-ray tube 3
5 is provided with a fan 38 at the upper part thereof.
Cooling and blowing. The X-ray tube 35 and the vinyl film 10 are covered with an X-ray shielding cabinet 39 formed by processing a 2 mm iron plate to prevent leakage of X-rays to the outside.

Next, the static electricity elimination method of this embodiment will be described with reference to FIG. The X-rays emitted from the X-ray tube 30 are applied almost uniformly to the upper surface of the vinyl film 10 advancing by the rotation of the rollers 20 and 21 in a direction crossing the advancing direction. By the X-ray irradiation, air or the like in contact with the upper surface of the vinyl film 10 is ionized and combined with the electric charge charged on the upper surface of the vinyl film 10. Therefore, the upper surface of the vinyl film 10 is discharged. The X-rays that have reached the upper surface of the vinyl film 10 penetrate the vinyl film 10 and also ionize air and the like in contact with the back surface of the vinyl film 10. The charge generated by the ionization is combined with the charge charged on the back surface of the vinyl film 10, and the back surface of the vinyl film 10 is also discharged. As described above, by irradiation of X-rays from one X-ray tube 30,
The static elimination can be performed on both sides of the vinyl film 10, which is more efficient than a conventional static eliminator that requires at least two X-ray tubes on the front and back.

In this embodiment, the vinyl film 1
Using ion gas that ionizes air, etc., in contact with 0,
The surface of the vinyl film 10 is neutralized. For this reason,
Before the positive ions and negative ions in the ion gas recombine, they combine with the charges on both sides of the vinyl film 10,
The charge can be effectively removed. In addition, the ion gas immediately after being ionized has an excellent ion balance (positive and negative quantitative balance), and the vinyl film 10 is neutralized by the ion gas having the excellent ion balance. Fine and strong electrification can also be eliminated. In other words, fine charging is a series of positive and negative charges that are finely and continuously charged, so that the potential is totally equal to zero as a whole. Therefore, it is necessary to remove the charge using an ion gas having an excellent ion balance. For this purpose, it is most effective to use the method of this embodiment in which ions are generated in the vicinity of the very surface, instead of the conventional method of transporting ions from a distance.

Further, instead of the vinyl film 10,
In the case where the static electricity of the belt-shaped paper is removed by the static electricity removing device of this embodiment, the air and the like clogged in the gaps of the paper fibers are also ionized, so that the charge can be removed more effectively. Such effects cannot be obtained with a conventional static eliminator that blows ion gas.

When the vinyl film 10 is negatively charged, for example, the negative charges are combined with the positive ions generated in the vicinity of the very surface of the vinyl film 10 to eliminate the charge. However, after the charge is removed, the negative ions remain. Become. If this negative ion adheres to the vinyl film 10, it will be charged again. However, in this embodiment, the vinyl film 10 is
Is moving by the rotation of the vinyl film 1
Air around 0 flows relatively in the opposite direction to this movement. This flow of air or the like causes the vinyl film 10
The negative ions remaining in the vicinity of the very surface of the film easily detach from the vinyl film 10. Therefore, ions after static elimination hardly adhere to the vinyl film 10.

FIG. 4 is a diagram showing an example in which the static electricity eliminator of this embodiment is attached to a film winding device. The film winding device of this example includes a winding roller 22 in addition to the rollers 20 and 21, and an X-ray tube 60 is provided above the roller 20 and the roller 21. An X-ray tube 61 is provided above. When the film winding device winds up the vinyl film 10, X-rays are transmitted from the X-ray tubes 60 and 61 to the vinyl film 1.
In this case, the electrostatic charge of the vinyl film 10 is removed.

FIG. 5 is a perspective view showing another embodiment of the static eliminator of the present invention. As shown in the figure, the static eliminator includes a cover 80 that covers the periphery of the vinyl film 10 to which the X-ray emitted from the X-ray tube 70 is irradiated.
The material of the upper surface 80a of the cover 80 is a material having a high X-ray transmittance, for example, beryllium (Be), aluminum (A).
l), carbon, polyimide resin, etc., or a perforated punching plate or a capital plate. The vinyl film 10 inside the cover 80 has a certain space filled with air or gas.

Cover 80 around vinyl film 10
, The scattering of ions generated around the vinyl film 10 inside the cover 80 can be prevented, and the residence time of the ions can be extended. For this reason, the economic efficiency is improved, and even if the moving speed of the vinyl film 10 is increased, the charge of the vinyl film 10 can be sufficiently removed.

In each of the above-described embodiments, an example of static elimination of a thin object such as a film or paper running at a high speed has been described. However, the thickness of the object can be adjusted by changing the voltage of the X-ray tube. be able to. For example, even for a liquid crystal glass plate, both surfaces can be neutralized by setting an X-ray tube voltage corresponding to the thickness of the glass.

[0028]

According to the static electricity eliminator of the present invention, the X-rays emitted from the X-ray tube are applied to one surface of the object to be neutralized, and transmitted through the object to be erased and applied to the opposite surface. By this irradiation, the gas in contact with both surfaces of the object to be neutralized is ionized, and the charge charged on the object to be neutralized and the charge of the ionized gas are combined, and both surfaces of the object to be neutralized are simultaneously eliminated. As described above, since the static elimination can be performed on both surfaces of the object to be neutralized at the same time by one X-ray tube, it is efficient. In addition, since the envelope covers the portion of the object to be irradiated which is irradiated with X-rays from the X-ray tube, scattering of ions generated around the irradiated portion is prevented, and the period of stay of ions is reduced. become longer. For this reason,
The economic efficiency is improved, and even if the moving speed of the object to be neutralized is increased, the charge on the object to be neutralized can be sufficiently removed. Also,
In particular, when the X-ray tube is arranged inside the envelope, the envelope can prevent leakage of X-rays to the outside.

In the method for removing static electricity according to the present invention,
Since the X-rays are irradiated almost uniformly in a direction intersecting the longitudinal direction of the object to be neutralized, the gas in contact with the irradiation surface of the object to be neutralized and the gas in contact with the back surface of the irradiation surface are ionized. For this reason,
The charge of the ionized gas and the charges charged on both surfaces of the object to be removed are combined, and both surfaces of the object to be removed are simultaneously discharged. As described above, since the static elimination can be performed on both surfaces of the object to be neutralized simultaneously by one X-ray tube, the efficiency is high.

Further, according to the static electricity elimination apparatus and the static electricity elimination method of the present invention, since the ion gas is generated in the vicinity of the object to be neutralized, the electric charge is removed before the positive and negative charges in the ion gas are recombined. The charge of the charge-eliminating object and the charge of the ion gas are combined, and the charge can be removed effectively.

Since the object to be neutralized advances in the longitudinal direction, the gas around the object to be neutralized flows relatively backward. Therefore, the ion gas generated near the object to be neutralized also flows backward without stopping near the object to be neutralized. For this reason, it is possible to prevent the object to be neutralized from being charged by the charge of the ion gas not used for the neutralization.

Furthermore, when the object to be neutralized is paper, the air that has entered between the fibers is ionized by X-ray irradiation, so that the electricity can be more effectively eliminated.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of an electrostatic discharger according to an embodiment.

FIG. 2 is a cross-sectional view illustrating a configuration of the static electricity removing device according to the present embodiment.

FIG. 3 is a cross-sectional view illustrating a configuration of the static electricity removing device according to the present embodiment.

FIG. 4 is a diagram showing an example in which the static electricity eliminator of the present embodiment is attached to a film winding device.

FIG. 5 is a perspective view showing a configuration of the static electricity eliminator according to the embodiment.

FIG. 6 is a perspective view showing a configuration of a conventional static eliminator.

FIG. 7 is a diagram showing an example in which a conventional static eliminator is attached to a film winding device.

[Explanation of symbols]

10: vinyl film, 20, 21, ... roller, 22
... winding roller, 30, 35, 60, 61, 70 ... X-ray tube, 31 ... base, 32 ... target film, 33, 36 ... cathode, 37 ... target, 38 ... fan, 39, 40
... X-ray shielding cabinet, 50 ... power supply device, 80 ... cover.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuaki Okumura 1 No. 1126 Nomachi, Hamamatsu City, Shizuoka Prefecture Hamamatsu Photonics Co., Ltd.

Claims (3)

(57) [Claims] A guide for inserting a long object to be neutralized and moving in a longitudinal direction; a gas arranged in a direction perpendicular to a surface of the object to be neutralized introduced into the guide portion and in contact with the object to be neutralized X that irradiates X-rays to
An electrostatic discharger comprising: a tube; and an envelope that covers at least a portion of the object to be irradiated with X-rays from the X-ray tube. 2. When the X-ray tube is disposed outside the envelope, a portion through which the X-rays emitted from the X-ray tube pass through the envelope has an X-ray transmittance. 2. The static electricity eliminator according to claim 1, wherein a high material, for example, beryllium (Be), aluminum (Al), carbon, polyimide resin, or the like, or a perforated punching plate or a capital plate is used. 3. A static electricity elimination method for eliminating static electricity of a long object to be neutralized which advances in a longitudinal direction, wherein X is substantially uniformly set in a direction intersecting the longitudinal direction of the object to be eliminated.
Irradiating a line to ionize a gas in contact with the irradiated surface of the object to be neutralized, thereby combining the charge of the ionized gas with the electric charge charged to the object to be neutralized to eliminate static electricity. Method.