JPS62105398A - High speed removing of static charge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for high-speed static electricity removal, and is applicable to printing (eg, type printing, offset, gravure), silk screen processing, film processing.

The present invention relates to a high-speed static electricity removal method suitable for assembling and punching plastic bags and paper bags, trimming plastics and paper (to enable packaging work), processing fibers, processing fluid granules, etc.

[Prior Art] Conventionally, various methods have been developed for erasing this type of static charge, and among these methods, representative methods that are in practical use will be explained. First, as a method, The charge is neutralized by generating and applying a charge having a polarity opposite to that of the electrostatic charge on the surface of the charged body using a corona discharge device (see Utility Model Application Publication No. 59-51500). Also,
The second and more widely used method is to eliminate static electricity by irradiating positive and negative corona ions with an AC corona discharge device (Utility Model Publication No. 34-13629, No. 38).
-18505, 40-16334, 41-11
No. 945, No. 55-15278, No. 56-33118
No., Utility Model No. 50-32967, No. 50-131964
No. 51-39476, Japanese Patent Publication No. 43-16026, Japanese Patent Publication No. 58-225600, Japanese Patent Publication No. 59-12600).

The first means includes [A] generating only positive corona ions using a positive high-voltage direct current (see Figure 4), and [B] generating only negative corona ions using a negative high-voltage direct current. [C] One that generates only positive corona ions by high frequency (see Figure 6), [C] One that generates only negative corona ions by DJ high frequency (see Figure 7). ) is known. On the other hand, as the second means, (El low frequency alternating current is used to alternately generate positive and negative corona ions (see Figure 8), [F] high frequency alternating current is used to generate positive and negative corona ions. A device that generates ions alternately (see FIG. 9) is known.

[Problems to be Solved by the Invention] In the techniques [A] to [0] above, if the electrostatic charge on the charged body is not uniform, uniform neutralization is not performed, and the application time of corona discharge is not uniform. The drawback is that if a mistake is made, the charged body may be charged in the opposite direction, and the usage conditions are severely restricted. On the other hand, the techniques [E] and [Fl described above are applicable to the techniques [A] to [0] described above.
However, since positive and negative corona ions are generated intermittently, if the object to be charged is moving at high speed, uneven charge removal may occur.

Furthermore, in the case of the Fl technology, if the frequency is increased (for example, 200 Hz or higher) in an attempt to remove static electricity at high speed, positive and negative ions interfere with each other, making it impossible to remove static electricity.

Therefore, the present invention is directed to a charged moving body (static charge removal symmetry) that moves at high speed.
The technical challenge is to make it possible to effectively eliminate static electricity even when

[Means for Solving the Problems] The present invention for solving the above technical problems outputs positive and negative high voltage currents from a converter connected to an AC power source or a DC power source, and outputs the positive and negative high voltage currents by It is characterized in that positive and negative corona ions are generated simultaneously and continuously by applying voltage to at least two corona discharge electrodes that are electrically isolated from each other.

That is, the present invention has the configuration shown in FIG.

The power source is IQOv or 200v, 50Hz or 6
You may use a 0Hz commercial text stream 111, or for example 1
．． A DC power source 1 of 5 to 100 V may be used.
The converter 2 connected to the converter 2 outputs positive and negative high voltage currents, and for example, it uses a very small amount of iA wire and iron core, like a transformer, but the majority consists of semiconductors, resistors, and capacitors. It is. The output terminals 3 and 4 of the converter 2 are each separately connected to at least two mutually electrically isolated corona discharge electrodes 5 and 6, from which positive and negative corona ions are supplied. are generated simultaneously and continuously (see figure $2).

In FIG. 1, numerals 7 and 7' denote earths provided as necessary, 8 an insulator, and 9 and 10 conductive wires, respectively.

An example of a corona discharge device preferably used in the method of the present invention has a configuration shown in FIG. 3, in which the same reference numerals as those used in FIG. ing. That is, the corona discharge device preferably used in the method of the present invention differs greatly from the device shown in the publication cited in the description of the prior art in that it uses a converter 2 instead of a step-up transformer, and also uses corona discharge electrodes 5 and 6.
The present invention has a configuration in which corona ions are simultaneously and continuously generated. Note that the corona discharge electrodes 5 and 6 may be needles or wires.

Further, the conductive wires 9 and 10 do not need to be arranged horizontally as shown in FIG. 3, but arbitrary design changes such as arranging them vertically offset are possible. Furthermore, earth 7 is not necessarily necessary,
Moreover, it does not need to be attached to the insulator 8.

[Effects of the Invention] According to the method of the present invention, corona ions are generated simultaneously and continuously from the corona discharge electrode, so even if the object to be neutralized moves at high speed near the corona discharge electrode, uneven static elimination will not occur. , effective static elimination is possible. In addition, since it uses a converter, compared to the conventional transformer,
The device (instrument) used can be made smaller and lighter. Furthermore, according to the method of the present invention, since corona discharge can be generated by a positive and negative potential difference, there is an effect that the earthing can be omitted.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of the high-speed static electricity removal method of the present invention.5 Fig. 2 is a converter output voltage waveform diagram in the same embodiment. FIGS. 4 to 9 are a cross-sectional perspective view of essential parts showing one embodiment of a suitable corona generating device, and FIGS. 4 to 9 are output voltage waveform diagrams of conventional corona generating devices. l: power supply, 2: converter, 3.4: output terminal, 5.6: corona discharge electrode, 7.7': earth. 8: Insulator. 9.10: Conductor

Claims (1)

[Claims] A converter connected to an AC power source or a DC power source outputs positive and negative high voltage currents, and the positive and negative high voltage currents are applied separately to at least two corona discharge electrodes that are electrically isolated from each other. A high-speed static electricity removal method characterized by simultaneously and continuously generating positive and negative corona ions.