JP3069837B2 - How to check static elimination of film etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing static electricity from an object to be treated (electrical insulator) such as a plastic film, a plastic plate, a plastic card, or paper subjected to a corona discharge treatment, and visually confirming the static elimination state. It relates to a method of precisely confirming.

[0002]

2. Description of the Related Art Conventionally, there is a method described in Japanese Patent Application Laid-Open No. 63-301495 as one of the methods for neutralizing a plastic film. This static elimination method corresponds to high-speed running of the object to be processed and performs two-stage static elimination of high-frequency static elimination and DC static elimination in order to remove reverse charging due to excessive static elimination, and performs feedback control of the DC static eliminator. Features. That is, after the charged traveling object is subjected to high-frequency corona discharge by a high-frequency neutralizer, the residual potential and polarity of the traveling object after the neutralization are detected by a potential detector in order to confirm the high-frequency neutralization effect. Then, by automatically controlling the DC neutralizer in accordance with the detected potential and polarity, the DC neutralizer generates a DC corona discharge having a polarity opposite to that of the residual charging potential and offset with the residual potential, thereby neutralizing and neutralizing the neutralizer.

[0003]

By the way, in the process of manufacturing and processing a plastic film, when the plastic film is run while being guided by a roller, the plastic film repeats friction and peeling with the roller. And the electrostatic discharge (peeling discharge) is repeated. In the case of a film that prints the surface,
In order to improve the printability by altering the film surface, the film is surface-treated by corona discharge. By such frictional charging and peeling discharge, and further corona discharge treatment, on both front and back surfaces of the plastic film, according to the charging mode and the discharging mode, the shape is very complicated and countless small positive and negative charged portions, The appearance (charged pattern) mixed randomly and closely appears.

[0004] Even if the charged potential of a plastic film in which the positive and negative charged portions are small and complexly mixed is measured by a potential measuring device, only the average polarity and potential in a wide range depending on the performance of the potential measuring device are measured. Cannot be measured. That is, the small positively charged portion and the negatively charged portion that are close to each other are:
Since the electric field is closed and electrostatically neutralized from each other on the film surface, such a small part has almost no effect on the measurement of the potentiometer, and the measurement result is macroscopic over a wide range. It has to be something typical.

Accordingly, the residual potential and the polarity after the static elimination process are estimated from the macroscopic measurement results as described above, and the subsequent static elimination conditions are uniformly determined (corresponding to the voltage applied to the static elimination electrode, etc.). Adjustment), even if the film surface is irradiated with positive and negative ions from the static eliminator away from the film, if the film surface is in the complicated charged state or the residual charge state as described above, Many places where no static electricity was removed remained, and even if the static electricity removing process was repeated, small static electricity removal unevenness remained until the end, resulting in a deterioration in the quality of products made of plastic films. For example, in a film product such as a magnetic tape in which a magnetic material or a coating agent is applied to the surface of a plastic film as a base, the coating cannot be performed uniformly because of a charged pattern. In addition, in order to eliminate uneven static elimination, the voltage is increased more than necessary, and either one of the positive and negative static elimination functions tends to be too strong, causing reverse charging, and an additional static elimination step is required for the static elimination. And efficiency was poor. The above is not limited to products using plastic as a material, but also applies to products using glass plates (for example, glass substrates for liquid crystal displays).

An object of the present invention is to provide a complex charged state or a residual charged state in which a myriad of small positive and negative charged portions are randomly mixed in close proximity as described above before and after the charge removal processing. Even if it is, it can be appropriately neutralized without uneven static elimination, insufficient static elimination, excessive static elimination, etc.,
An object of the present invention is to make it possible to divide the aspect of the charge elimination into positive and negative, and to visually display precisely the level of the potential in both positive and negative.

[0007]

According to the present invention, an object to be processed, such as a film, is placed between a positive / negative ion generating neutralizing electrode and an ion attracting electrode to which a high voltage having positive and negative polarities is alternately applied. By running, the positive and negative ions generated at the positive and negative ion generating static elimination electrode are attracted by the ion attracting electrode, forcibly irradiating the object to be treated, and then neutralized. By contacting the negatively charged toner and attaching the negatively charged toner to the portion having a positive charge and attaching the positively charged toner to the portion having a negative charge, positive and negative colors can be displayed on the surface of the object to be processed in different colors. At the same time, the level of the positive and negative potentials can be displayed by the shading of the color, and the ground color not colored with the toner can be presumed to have no charge. The positive toner and the negative toner having different colors are preferably mixed in advance and sprayed on the surface of the object to be processed, but may be sprayed separately.

[0008]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an overall schematic configuration of an example of a static eliminator and dust eliminator to which the method according to the present invention is applied. In FIG. 1, a plastic film (hereinafter, referred to as a film) 1 which has been subjected to a corona discharge treatment by a corona discharge treatment device (not shown) to modify the surface is guided by guide rollers 8 and travels rightward. After the charge is removed by the charge removing section A, the dust is removed by the dust removing section B. In the static elimination section A, a static elimination gate section 9 is configured by making the common ion attraction electrode 2 face a plurality of positive and negative ion generating static elimination electrodes 3. Then, the film 1 passes through the charge eliminating gate unit 9 while being discharged in multiple stages between the charge eliminating electrode 3 and the ion attraction electrode 2 as described later.

FIG. 20 (A) shows a case where the present invention is applied to a film (polyethylene film having a thickness of 12 μm) 1 which has been subjected to corona discharge treatment and before static elimination, and a positive toner powder and a negative electrode having different colors are formed on the film surface. Adhere to the toner powder
The toner-adhered image is copied on a blank sheet by a monochrome copying machine, and a part of the image is shown in the drawing. That is, a red positive toner powder and a blue negative toner powder are mixed in equal amounts in advance, and the resulting mixture is sprayed on the film surface. The toner powder is adhered, red positive toner powder is adhered to a portion having a negative charge, and a part of the toner powder is directly copied on a white paper by a monochrome copying machine. The actual image on the film 1 appears as a dense and clear color image composed of the red portion, the blue portion, and the ground color portion of the film 1. However, since the image is changed to a monochrome image, FIG. And the blue portion are both black, the ground color of the film 1 is white, and the shading of black indicates the level of the positive and negative potentials. FIG. 20B shows the same toner color image processed so that only the red toner-adhered portion appears black. In this drawing, the black portion has a negative charge and the shading is negative. The high, low, and white portions are portions having no charge. FIG. 20C shows the same toner color image processed so that only the blue toner adhering portion appears black. In this drawing, the black portion has a positive charge and the shading is positive. High and low potentials and white portions are portions having no charge.

Although the red positive toner powder and the blue negative toner powder are previously mixed and sprayed simultaneously on the surface of the film 1, they may be sprayed separately. According to the experiment, the color of the adhesion was better in the case of mixing in advance than in the case of separately spraying. If they are separately sprayed, it is difficult to make the amount of spraying of both toner powders per unit area the same, but if equal amounts are mixed in advance, it is easy and workability is good. Further, the toner powder may be attached by a method other than spraying. It goes without saying that the color of the toner can be arbitrarily selected.

Each static elimination electrode 3 in FIG.
And extends beyond the width. As each of the static elimination electrodes 3, various structures can be used, but one using a large number of discharge needles is economical, and a typical example of a ready-made electrode is shown in FIG. 5 (bottom view) and FIG. This static elimination electrode is separately implanted in a core 11 made of a ceramic dielectric or ceramic resistor so that each of the discharge needles 10 can be separately capacitively coupled or resistancely coupled. By embedding these cores 11 and the printed circuit board 12 in the insulating mold 14 in the resin casing 13 in a state where the cores 11 and the printed circuit board 12 are fitted one by one into the holes of the long printed circuit board 12, a part of the large number of discharge needles 10 is formed. Are arranged and protruded from the surface of the insulating mold 14 at regular intervals in the length direction of the resin casing 13 (the width direction of the film 1),
The ground electrode plates 7 are provided in parallel on both sides of the arrangement. When a high voltage is applied to the conductive pattern of the printed circuit board 12, corona discharge is generated simultaneously with the ground electrode plate 7 of all the discharge needles 10 to generate ions. It can be used. Note that the length of the charge removing electrode 3 exceeds the width of the film 1.

In FIG. 1, a plurality of such static elimination electrodes 3 are used and installed in parallel at intervals in the running direction (length direction) of the film 1 and slightly away from one surface (upper surface) of the film 1. , AC high voltage power supply AC to AC high voltage HV1
Are applied simultaneously. The distance between the charge removing electrodes 3 is adjusted according to the running speed of the film 1. These static elimination electrodes 3 are held by a common holder 15 and can be advanced (rearranged) with respect to the film 1 by a linear motion actuator 16 such as an air cylinder.

On the other hand, the ion attracting electrode 2 is a single plate (a conductive metal plate or the like) having a flat surface common to all the static elimination electrodes 3 in both the running direction and the width direction of the film 1. It is configured so as not to contact the film 1. An AC high voltage HV2 having a phase opposite to that of the charge removing electrode 3 is applied from the AC high voltage power supply AC. The ion attraction electrode 2 is also supported by a linear motion actuator 22 such as an air cylinder via an insulator 21 so that
The film 1 can be moved forward and backward (position adjustment).

As shown in FIG. 2, alternating high voltages HV1 and HV2 having opposite phases are applied to the positive / negative ion generating neutralizing electrode 3 and the ion attracting electrode 2, respectively. The generated positive and negative ions are
The same suction can be performed by the processing target object 1 itself. FIG. 3 shows an equivalent circuit in this case. In the figure, reference numeral 7 denotes a ground electrode for the neutralizing electrode 3, and C denotes a capacitance formed between the ion attraction electrode 2 and the object 1 to be processed. Further, a positive ion generating electrode 3A for generating positive ions and a negative ion generating electrode 3B for generating negative ions are provided as the positive and negative ion generating neutralizing electrodes 3, and positive and negative DC high voltages DHV1 and DHV2 are applied to these electrodes, respectively. To generate positive and negative ions at the same time. FIG. 4 shows an equivalent circuit in this case.

Therefore, when a positive high voltage is applied to each static elimination electrode 3 to generate positive ions, a negative high voltage is applied to the ion attracting electrode 2 and the capacitance C is applied to the surface of the film 1. , A negative potential is induced, and when a negative high voltage is applied to each static elimination electrode 3, a positive high voltage is applied to the ion attraction electrode 2 to induce a positive potential on the film 1 surface. Therefore, the positive and negative ions generated alternately at the charge eliminating electrodes 3 are both positively and negatively forcibly irradiated toward the surface of the film 1 by the Coulomb force. As a result, before entering the static elimination gate section 9 (at the position in FIG. 1), as shown in FIG. 20, a myriad of small positive and negative charged portions are randomly mixed to form a complicated charged pattern, and microscopically. Even if it is in a neutralized state, negative ions are positively reacted to the positively charged part and positive ions are positively reacted to the negatively charged part, so that the positively and negatively charged parts can be separately and strongly neutralized. . In addition, such an operation is repeatedly performed by the plurality of static elimination electrodes 3 arranged in the running direction of the film 1. In this case, since the ion attracting electrode 2 has a surface extending in the running direction and the width direction of the film 1, there is no spatial unevenness in the ion attracting force, and the positive and negative ions can be equally attracted. Therefore, even when viewed microscopically, there is little unevenness in static elimination.

A region on one side edge of the width of the film 1 is masked so as not to be subjected to the charge elimination process to make it a non-charge elimination region, and the region of the film 1 immediately after passing through the charge elimination gate 9 (the position in FIG. Although toner powder was adhered in the same manner as in the case of No. 20, although not shown, when the charge was removed in the charge removing gate section 9, a complicated charged pattern as in the non-static removal area disappeared. The thin horizontal stripes extending in the width direction appeared alternately in the running direction of the film 1 in a wavy manner. This is because, in addition to the polarity of the voltage applied to the neutralizing electrode 3 and the ion attracting electrode 2, the polarity alternates between positive and negative.
This is because, when the film 1 moves with respect to these electrodes, when the charged surface is viewed in the running direction, the places where the static elimination by the positive ions and the places where the static elimination by the negative ions are strong alternate. Such macroscopically appearing uneven static elimination is achieved by arranging a plurality of static elimination electrodes 3 in parallel in the running direction of the film 1 and forcibly irradiating positive and negative ions by changing the location on the film 1 surface. Averaging can be minimized.

The amount of positive and negative ions generated by the positive / negative ion generating static elimination electrode 3 changes in accordance with the frequency of the AC high voltage HV1 applied to the static elimination electrode 3, so that the frequency is equal to the frequency of the commercial AC power supply ( If it is about 50 Hz or 60 Hz), the change cycle of the amount of ions generated is slow, and if the running speed of the film 1 is high, uneven charge removal occurs. Therefore, if the frequency of the AC high voltage HV2 applied to the ion attraction electrode 2 is made higher than the frequency of the AC high voltage HV1 applied to the charge removing electrode 3, unevenness in the charge removal due to a temporal change in the amount of generated ions can be reduced.

In order to perform auxiliary static elimination after the static elimination by the static elimination gate unit 9 as described above, the DC eliminator 4 for negative ion generation is further disposed on the side of the film 1 than the static elimination gate unit 9 in the traveling direction. A DC neutralizer 5 for generating positive ions is disposed on the side, and an AC neutralizer 6 is further disposed on the traveling direction side. A negative DC high voltage is applied to the negative ion generating DC neutralizer 4 by the DC high voltage power supply DC, and a positive DC high voltage is applied to the positive ion generating DC neutralizer 5 by the DC high voltage power supply DC2. And an AC high voltage is applied to the AC static eliminator 6 by the AC high voltage power supply AC3. As this AC static eliminator 6, the same as that shown in FIGS. 5 and 6 can be used. DC neutralizer 4,5
May be a known one using a large number of discharge needles, and it is not necessary to use a special one.

The DC neutralizers 4 and 5 and the AC neutralizer 6
In order to weaken the static elimination power of the film 1 more than the static elimination electrode 3 of the static elimination gate section 9, the distance to the film 1 is generally larger than that of the static elimination electrode 3, and further, the mutual static elimination is gradually weakened. The distance to is gradually increased.

The film 1, which has been neutralized by the static elimination gate unit 9 as described above, is irradiated with negative ions from the negative ion generating DC neutralizer 4 so that the positive and negative waves alternately wave as described above. The positively charged portion of the remaining charge portion is discharged. When toner powder was adhered to the surface of the film 1 after the static elimination process (position in FIG. 1) in the same manner as described above, the wavy charged portion disappeared, and each of the discharge needles of the DC static eliminator 4 corresponded. A thin U-shaped portion of the residual charge remained around the portion where the film 1 was formed, and this became a light continuous pattern continuously in the width direction of the film 1. A complicated charged pattern still remained in the non-electrified region N masked so as not to be subjected to the charge eliminating process.

Next, the film 1 is subjected to a static elimination process by positive ions from the DC eliminator 5 for generating positive ions. When the toner powder was similarly adhered to the surface of the film 1 after being subjected to static elimination (the position in FIG. 1), only a slight light and shade remained on the surface of the film 1. , A complicated charge pattern still remained.

Finally, the film 1 is subjected to a weak positive / negative static elimination process by positive and negative ions from the AC static eliminator 6. FIG. 21 shows a state in which the toner powder has adhered to the surface of the film 1 after being subjected to the static elimination (the position in FIG. 1) in the same manner as described above. As can be seen from the figure, a complicated charged pattern remains in the masked non-static-free region N to the end (black in both positive and negative directions), but in the portion where the static elimination is performed, the ground color to which neither the red toner nor the blue toner adheres. (White).

On the other hand, the film 1 in a charged state as shown in FIG.
(running speed of n) After neutralizing with a conventional AC voltage applying type static eliminator, spray a mixture of equal amounts of red positive toner powder and blue negative toner powder on the surface in the same manner as above. Then, a blue negative toner powder is adhered to a portion having a positive charge on the surface of the film 1, and a red positive toner powder is adhered to a portion having a negative charge. When the paper was copied on white paper, a complicated charged pattern appeared as shown in FIG. 22, and it was found that there was almost no effect of static elimination microscopically. In FIG. 22A, as in FIG. 20A, both the red portion and the blue portion are black because the monochrome copy is performed, and the ground color of the film 1 is white. The shading indicates the level of the potential. FIG. 22 (B) shows a process in which only the red toner adhering portion appears black as in FIG. 20 (B). The black portion has a negative charge and the shading is a negative potential. High and low,
The white portion is a portion having no charge. Further, FIG. 22C shows a process in which only the portion where the blue toner adheres appears black as in FIG. 20C, the black portion has a positive charge, and the shading is High and low positive potentials and white portions are portions having no charge.

In FIG. 1, the film 1 whose charge has been removed in the charge removing section A is subsequently conveyed to the dust removing section B. In the static elimination unit B, an air shower dust removal unit 50 in which an air injection unit 50a and two air suction units 50b are formed in a casing 51 is installed above the roller 8.
The air injected from the air injection unit 50a is
Since the light is reflected by the film 1 and is reflected by the two air suction portions 50b, dust or the like adhering to the film 1 is forcibly removed and collected. in this case,
Since the film 1 has just been neatly discharged until the charged pattern disappears in the charge eliminating section A, the dust is also neatly removed.

FIG. 7 shows the dust removing section B in detail. In the same drawing, air from a blower 52 is supplied to an air injection unit 50 a of an air shower dust removal unit 50 through an air supply filter 53 and an air supply damper 54, and the air is blown by the blower 52. Suction unit 50b
The air sucked into the air is returned to the blower 52 via the intake-side damper 55 and the intake-side damper 54. The air injection unit 50a is provided with a nozzle 57 that injects air obliquely toward the film 1 running on the surface of the roller 8, and the air suction unit on the air injection unit 50a side of the two air suction units 50b. Is provided with a small intake port 58, and the other air suction section is provided with a large intake port 59.

Therefore, after the air jetted from the nozzle 57 hits the film 1 on the roller 8 and is reflected,
The suction is performed by the two air suction units 50b. Note that the charge elimination and the dust elimination may be performed simultaneously in the same place. In FIG. 7, reference numeral C denotes an auxiliary static eliminator for neutralizing the film 1 peeled off from the roller 8. The auxiliary static eliminator C may have the same configuration as all or part of the neutralizer A described above.

Instead of using a plurality of independent neutralizing electrodes as shown in FIGS. 5 and 6, a multi-AC neutralizer 3A as shown in FIGS. 8 and 9 (bottom view) may be used. The multi AC discharger 3A includes a large number of discharge needles 10.
Are arranged on the plate-shaped insulating holder 17 at predetermined intervals in the width direction of the film 1, and a plurality of rows are provided in parallel at intervals in the running direction of the film 1.
In addition, the ground electrode rod 7A is provided on the insulating holder 17 so as to be positioned in parallel on both sides of each row of the discharge needles 10. An AC high voltage is simultaneously applied to all the discharge needles 10 via a high-voltage cable 18 pulled out from the insulating holder 17, and all the ground electrode rods 7 A are attached to the insulating holder 17. Grounding can be performed via the conductive plate 19 and the grounding cable 20. The AC type multi-electrode 3 shown in FIGS.
When A is used, the ion attraction electrode 2 is connected to the discharge needle 10.
Have a plane in common with all the rows.

FIGS. 10 and 11 show a positive / negative ion simultaneous generation type multi DC eliminator 3B in place of the plurality of elimination electrodes 3 of the elimination gate 9. FIG. In the multi DC eliminator 3B, a large number of discharge needles 37 are arranged and protruded at regular intervals in the width direction of the film 1 on a plate-like insulating holder 38, and the rows are arranged in the running direction of the film 1. A plurality of rows are provided in parallel at intervals. Then, as shown in FIG. 11, positive discharge needles and negative discharge needles are arranged alternately in each row. Alternatively, the film is divided into a row of positive discharge needles and a row of negative discharge needles, and the positive rows and the negative rows are alternately arranged in the running direction of the film 1. 39 and 40 are high voltage cables for supplying positive and negative DC high voltages, respectively.

FIG. 12 shows a specific example of a power supply for the charge eliminating section A. The AC high-voltage power supply AC has a transformer 23 for boosting an AC voltage from a commercial AC power supply, and has one of the positive and negative bipolar taps on the secondary side connected to all of the taps arranged as described above. The tap is connected to the charge removing electrode 3 and the other tap is connected to the ion attracting electrode 2. Therefore, AC high voltages HV1 and HV2 having opposite phases are simultaneously applied to the charge eliminating electrode 3 and the ion attracting electrode 2, respectively. In this drawing, the plate-shaped common ion attracting electrode 2 is inclined downward in the traveling direction of the film 1 so that the ion attracting force to the neutralizing electrode 3 gradually weakens as the film 1 advances. This makes it possible to efficiently eliminate macroscopic unevenness in static elimination.

The DC high-voltage power supply DC converts an AC voltage from a commercial frequency power supply into a DC voltage whose voltage is dropped by an AC / DC converter 26 including a transformer 24, a diode 25, and the like, and then converts the voltage into a constant voltage IC circuit. 27, and outputs a DC voltage arbitrarily adjusted by a variable resistor 28 from an output terminal of the constant voltage IC circuit 27. Then, the adjusted DC voltage is further smoothed by the capacitors 29 and 30 and then applied to the high-frequency oscillation circuit 31.

The high-frequency oscillation circuit 31 includes a high-frequency transformer 3
When the start-up transistor 33 is turned on by application of a DC voltage, high-frequency oscillation is caused by self-excited oscillation. When this oscillates, an AC high voltage is obtained on the secondary side of the high-frequency transformer 31 and the light emitting diode 34 is turned on. On the secondary side of the high-frequency transformer 32, a positive side voltage doubler rectifier circuit 35 and a negative side voltage doubler rectifier circuit 36 are connected in parallel. These voltage doubler rectifier circuits 35.3
In a known manner, by connecting diodes and capacitors in series, as is well known, a DC high voltage which is a multiple of the secondary voltage of the transformer 32 can be obtained by the number of stacked stages. The output terminal of the negative side voltage doubler rectifier circuit 36 is connected to the negative ion generating DC neutralizer 4 via a high voltage cable to apply a negative DC high voltage thereto. Similarly, it is connected to a positive ion generating DC neutralizer 5 via a high voltage cable, and applies a positive DC high voltage thereto.

The constant voltage IC circuit 27, the variable resistor 2
8, a high-frequency oscillation circuit 31, a high-frequency transformer 32, and a light-emitting diode 34 may be prepared for each of the voltage doubler rectifier circuits 35 and 36.

In an AC high-voltage power supply AC, FIG.
In the second example, voltages of opposite phases are extracted from two taps of one secondary winding of the transformer 23. However, two secondary windings are provided, and voltages of opposite phases are separately extracted from them. You may do it. Further, the connection between the secondary side of the transformer 23 and the charge removing electrode 3, and similarly, the connection between the secondary side of the transformer 23 and the ion attraction electrode 2 may be a connection type of either resistance coupling or capacitance coupling.

Further, instead of tilting the ion attraction electrode 2 as shown in FIG. 12, for example, as shown in FIG. 13, a plurality of taps are provided on the secondary side of the transformer 23 of the AC high voltage power supply AC. Alternatively, the voltage applied to the plurality of static elimination electrodes 3 may be reduced stepwise in the order in which the film 1 travels.

Next, a modified example of the static elimination unit other than those described above will be briefly described. FIG. 14 uses a DC eliminator of a positive / negative ion simultaneous generation type as each elimination electrode 3 of the elimination gate section 9, and simultaneously applies a positive DC high voltage and a negative DC high voltage from a DC high voltage power supply DC respectively. It is something to do. In this case, each DC static eliminator applies a positive / negative DC high voltage to a large number of discharge needles arranged in one line in the width direction of the film 1 so as to have a positive / negative alternating relationship in the arrangement direction. That is, the positive discharge needles and the negative discharge needles are alternately arranged in one line. Alternatively, the column is divided into a row of positive discharge needles and a row of negative discharge needles, and positive and negative DC high voltages are separately applied to these two rows.

FIG. 15 shows the static elimination gate section 9 and the AC static eliminator 6.
Also, the two DC neutralizers 4 and 5 disposed between the DC neutralizers 4 and 5 are of the above-described positive and negative ion simultaneous generation type, and FIG.・ 5 is a positive / negative ion simultaneous generation type. FIG.
In the case of FIG. 5 and FIG. 16, one of the two DC eliminators 4.5 can be omitted.

FIG. 17 shows a plurality of neutralizing electrodes 3 for generating positive and negative ions arranged in parallel in the running direction of the film 1 with an ion attracting electrode 2 opposed thereto.
The positive and negative ions from are attracted by the respective ion attracting electrodes 2. In this case, a plurality of ion suction electrodes 2 arranged in parallel
The high voltage applied to the film 1 may be gradually lowered in the order in which the film 1 travels.

When the traveling speed of the plastic substrate to be processed is low, as in the case of processing a plastic substrate for a liquid crystal display, one ion is applied to one positive / negative ion generating static elimination electrode 3. Even if the suction electrodes 2 are opposed to each other, a required static elimination effect can be obtained.

FIG. 18 shows that the ion attracting electrode 2 is
, And a plurality of static elimination electrodes 3 are arranged along the arc of the roller. This roller is preferably formed as a metal cylinder as shown in FIG. 19, and a dielectric layer 60 is formed on the surface thereof. According to the structure as shown in FIG. 18, the static elimination efficiency is higher than when the ion attraction electrode 2 is separated from the film 1 as in the other examples described above. Also, the device can be downsized. In addition, with respect to the same ion attraction electrode 2, a charge removing electrode for AC charge removal and a charge removing electrode for DC charge removal may be arranged to face each other.

[0041]

According to the present invention, even if the surface of the object to be processed before and after the static elimination processing is in a complicated charged state or a residual charged state in which countless small positive and negative charged portions are randomly mixed in close proximity. In addition, static electricity can be properly eliminated without uneven static elimination, insufficient static elimination, excessive static elimination, or the like, and the mode of the static elimination can be divided into positive and negative, and both the positive and negative can be visually displayed with high and low potential.

According to the third aspect of the present invention, a part of the object to be processed is masked so as not to be neutralized, and the masked portion and the non-masked portion have different colors of positive toner and negative toner. , The degree of static elimination performance can be visually evaluated from the difference in toner adhesion between the portion where the static elimination is performed and the portion where the static elimination is not performed.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram of a static eliminator and dust eliminator to which a method of the present invention is applied.

FIG. 2 is a waveform diagram showing a phase relationship between AC voltages applied to a positive / negative ion generating neutralizing electrode and an ion attracting electrode in FIG.

FIG. 3 is an equivalent circuit in a case where an AC voltage is applied to a positive / negative ion generation static elimination electrode.

FIG. 4 is an equivalent circuit in the case where positive and negative high voltages are respectively applied to the positive ion generating electrode and the negative ion generating electrode of the positive and negative ion generating static elimination electrodes.

FIG. 5 is a bottom view showing a specific example of a positive / negative ion generation static elimination electrode.

FIG. 6 is a sectional view of the above.

FIG. 7 is a configuration diagram illustrating an example of a dust removing unit.

FIG. 8 is a partial cross-sectional view of an example in which a positive / negative ion generating static elimination electrode has a multi-AC electrode structure.

FIG. 9 is a bottom view in which a part of the above is omitted.

FIG. 10 is a front view of an example in which the positive / negative ion generating static elimination electrode has a multi DC electrode structure.

FIG. 11 is a bottom view in which a part of the above is omitted.

FIG. 12 is an electrical connection diagram mainly showing a specific example of a power supply of a static eliminator;

FIG. 13 is an electrical connection diagram showing a first modification of the static eliminator.

FIG. 14 is an electrical connection diagram showing a second modification of the charge removing section.

FIG. 15 is an electrical connection diagram showing a third modification of the static eliminator.

FIG. 16 is an electrical connection diagram showing a fourth modification of the charge removing section.

FIG. 17 is an electrical connection diagram showing a fifth modification of the static eliminator.

FIG. 18 is a schematic configuration diagram of an example in which a roller for guiding a film is a discharging electrode for generating positive and negative ions.

FIG. 19 is a sectional view of the roller in the above.

FIG. 20 (A) shows a case where the present invention is applied to a plastic film before static elimination, red positive toner powder and blue negative toner powder are adhered to the film surface, and the toner adhered image is monochrome. The image is copied on a blank sheet by a copying machine, and a part of the image is shown in the figure. (B) is a diagram processed so that only the red toner-attached portion appears black, and (C) is a diagram processed so that only the blue toner-adhered portion appears black.

FIG. 21 is a view showing a film having a portion having a charge removed by the charge removing and dust removing apparatus shown in FIG. 1 and a portion having a portion masked so as not to be charged removed, similarly to FIG. 20 (A).

FIG. 22 is a diagram in which toner powder is adhered to the surface after the charge is removed by an AC voltage application type charge remover in the same manner as in FIG. 20 and is similarly divided into (A), (B), and (C). It is.

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Claims (3)

(57) [Claims] An object to be treated, such as a film, is caused to travel between a positive / negative ion generating neutralizing electrode and an ion attracting electrode to which a high voltage whose polarity is reversed is applied alternately, thereby generating positive and negative ions. A neutralization step of attracting the positive and negative ions generated at the neutralizing electrode by the ion attracting electrode and forcibly irradiating the object to be treated with electricity, and a positive toner having a different color on the surface of the object to be treated having the electricity removed; A negatively charged toner and a negatively charged portion thereof, and a positively charged toner on a portion having a negative charge. Confirmation method. 2. An object to be treated such as a film is caused to travel between a neutralizing electrode for generating positive and negative ions and an ion attracting electrode to which a high voltage having opposite polarity is applied alternately. Positive and negative ions generated by the charge removing electrode are attracted by the ion attracting electrode to forcibly irradiate the object to be treated with charge removal, and a positive toner and a negative electrode having different colors are provided on the surface of the charge-removed film or the like. A toner attaching step of contacting the positive and negative mixed toners mixed with the positive toner, and attaching the negative toner to the portion having the positive charge and the positive toner to the portion having the negative charge. How to check static elimination of film etc. 3. In the charge removing step, a part of the object to be processed is masked so as not to be charge removed.
3. The method according to claim 1, wherein a positive toner and a negative toner having different colors are brought into contact with the masked portion and the unmasked portion.