JP3997484B2 - Method and apparatus for punching film by corona discharge - Google Patents

Description

  The present invention relates to a drilling method and a drilling device for making a large number of holes in a film using corona discharge.

There exists a thing of patent document 1 (patent 2626430 gazette) as a technique of this field | area.
In this prior art, a first roll having a large number of natural or synthetic diamond particles having sharp corners attached to the surface and a second roll having a surface coated with a dielectric layer are used to sandwich the film. A high voltage is applied to the first roll while the first roll is driven to rotate in a state where the second roll is driven, and the second roll is driven to rotate in the opposite direction to the first roll, so that the sharp corners of the diamond particles bite into the film. A number of fine recesses are mechanically formed, and at the same time, corona discharge is caused between the sharp corners of the diamond particles that have bitten into the film and the surface of the second roll pressing the film against the corners. A number of holes smaller than that following the numerous recesses are formed, and the inner surface of the recess is modified (improvement of wettability).

However, this has the following problems.
(1) The first roll, which is an electrode to which a high voltage is applied, has a large number of diamond particles that are dielectrics attached to the surface thereof, so that the diamond particles themselves are expensive and the production is troublesome. The cost is high.
(2) While feeding the film between the first roll and the second roll, that is, the sharp corners of the diamond particles of the first roll are bitten into the film, and on the opposite side, the film is fed by the second roll. While pressing and rotating the first roll and the second roll in opposite directions and feeding the film with them, between the diamond particles as the dielectric and the second roll whose surface is the dielectric layer Since a corona discharge is generated, only very fine holes can be made.
(3) For the same reason, the heights of the corners of the diamond particles are uneven even slightly, the outer surface of the second roll is uneven, or the first or second roll is slightly eccentric. As a result, uneven discharge or non-discharge occurs, and the size of the hole becomes uneven or a hole cannot be formed.
(4) Only the inner surfaces of the recesses where the corners of the diamond particles bite can be modified.
(5) A mechanism for pressing the second roll and a mechanism for adjusting the pressure are required, and the entire apparatus becomes complicated.
Japanese Patent No. 2644330

  The problem of the present invention is that there is no problem as described above, that is, a large hole can be uniformly and uniformly formed in the film, and at the same time, the film can be extensively modified and the structure of the electrode itself can be simplified. It is another object of the present invention to provide a method for punching a film by corona discharge and a punching device that can simplify the mechanism of the entire apparatus.

In the drilling method of the present invention, a number of metal needles are arranged in an axial line of the metal body, and a needle roll projecting on the outer peripheral surface of the metal body so that the line is parallel to the circumferential direction of the metal body, While disposing the roll electrode with the outer surface as a dielectric away from the roll electrode and disposing the pressing guide roll on the downstream and upstream sides of the needle roll, the roll electrode applies high voltage while driving and rotating, while the needle The roll is grounded and freely rotated, and it runs away from the outer surface of the roll electrode, with the film to be punched pressed against multiple rows of metal needles of the needle roll with the downstream and upstream holding guide rolls. By rotating the roll electrode, the metal needles are brought into close contact with the film sequentially while rotating the needle roll with the traveling film, and the creeping discharge generated along the dielectric surface of the roll electrode is caused by the rotation of the roll electrode. Is dispersed, the corona by the creeping discharge, successively opposed to simultaneously modify the then converge into the needlepoint of a plurality of rows of metal needle serving as ground electrode for boring a film on the dielectric surface.

The punching device of the present invention comprises a needle roll projecting on the outer peripheral surface of the metal body so that a number of metal needles are arranged in the axial direction of the metal body, and the rows are aligned in the circumferential direction of the metal body, A roll electrode having a dielectric outer surface is disposed opposite to it, and a pressing guide roll is disposed on the downstream side and the upstream side of the needle roll, and a high voltage is applied while the roll electrode is driven to rotate. On the other hand, the needle roll is grounded and freely rotated, and the outer surface of the roll electrode is pressed with the film to be punched pressed against the metal needles in the plurality of rows of the needle roll by the downstream and upstream holding guide rolls. The metal needles are brought into close contact with the film sequentially while rotating the needle roll with the running film, and the creeping discharge that occurs along the dielectric surface of the roll electrode is The corona due to the creeping discharge is converging on the tips of metal needles in multiple rows that are to be opposed to the dielectric surface in order to form a ground electrode, so that the film can be perforated and modified at the same time. Yes .

  When the surface of the film is modified by corona discharge, usually, a high voltage is applied to a needle roll provided with a large number of metal needles, while the outer surface is grounded to a dielectric roll electrode. Each of the metal needles of the needle roll is discharged from the needle tip toward the outer surface of the roll electrode while the film is in contact with the outer surface of the roll.

In the present invention, on the contrary, since a needle roll provided with a large number of metal needles is grounded and a high voltage is applied to the outer surface of the dielectric roll electrode, the outer surface of the roll electrode faces the metal needle. This surface becomes a discharge electrode, and each of the metal needles facing the outer peripheral surface of the roll electrode becomes a ground electrode, and corona discharge through a dielectric occurs. The corona discharge becomes a creeping discharge that spreads along the dielectric surface without concentrating on the dielectric surface, which is the outer surface of the roll electrode, and is further diffused by rotating the roll electrode. The corona generated by the creeping discharge has the highest concentration on the dielectric surface and the widest spread, and tends to converge while gradually reducing the concentration as it approaches the tip of the metal needle that becomes the ground electrode. There is no spark discharge because the film hits the tip of the metal needle . And, since such corona discharge is performed through the film simultaneously with a plurality of rows of needles of a plurality of rows of metal needles piercing the film, the film has a circular shape larger than the tip of each metal needle. The holes are opened with a uniform size. Further, since the corona having the spread as described above is generated in a wide range by simultaneous discharge between the metal needles in a plurality of rows, the film is modified in a wide range at the same time as perforation.

The needle roll rotates freely in a state of being separated from the roll electrode, and is rotated by running of the film. Therefore, even if the metal needle pierces the film, the film is not scratched by the metal needle. Further, it is not necessary to take a discharge timing with the roll electrode.

  From the above, the present invention is suitable for making a hole in a sticky and stretched film.

  In addition, the device has a simple structure in which a roll electrode that is rotated while a high voltage is applied to a grounded needle roll that rotates freely, so that it can be provided at low cost and maintenance is easy. is there.

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

  FIG. 1 shows an outline of the present invention. The film (for example, polyethylene film) 1 passes between the needle roll 2 and the roll electrode 3 facing the needle roll 2 while continuously running in the direction of the arrow.

  As shown in FIGS. 2 and 3, the needle roll 2 forms a row with a large number of metal needles 4 spaced in the axial direction on the outer peripheral surface of the metal body 2a, and the rows are spaced in the circumferential direction. In parallel and adjacent rows, the needles and the needles are provided so as to have an arrangement relationship in which the needles are different from each other in the axial direction. The needle roll 2 is grounded and is supported by a shaft 2b so as to freely rotate.

  On the other hand, the roll electrode 3 is formed by coating the outer peripheral surface of the metal body 3a with a dielectric 5 made of silicon, ceramic, or glass, and is applied with a high frequency high voltage by a high frequency high voltage power source 6, as shown in the figure. It is driven and rotated by a drive source that does not. The outer diameter of the roll electrode 3 is preferably as small as possible for perforating the film (it may be smaller than the needle roll 2).

  Guide rolls 7 and 8 are disposed on the downstream side and the upstream side of the needle roll 2, and the film 1 is pressed against the needle tips of the metal needles 4 of the needle roll 2 by these holding guide rolls 7 and 8. , Away from the surface of the dielectric 5 which is the outer surface of the roll electrode 3.

  Accordingly, the freely rotating needle roll 2 is rotated by the traveling of the film 1, and the metal needles 4 facing the outer peripheral surface of the roll electrode 3 (the surface of the dielectric 5) are sequentially changed. While the needle roll 2 is grounded, a high frequency high voltage is applied to the roll electrode 3, so that the surface of the roll electrode 3 facing the metal needle 4 is the discharge electrode and the outer periphery of the roll electrode 3. Each one of the metal needles 4 facing the surface serves as a ground electrode, and a corona discharge is generated via the dielectric 5 away from the film 1 while the needle tip of the metal needle 4 is stuck into the film 1.

This corona discharge becomes a creeping discharge that spreads along the surface of the dielectric 5 without concentrating on the surface of the dielectric 5 that is the outer surface of the roll electrode 3, and the roll electrode 3 is driven and rotated. Further diffuse. The corona generated by the creeping discharge has the highest concentration on the surface of the dielectric 5 and the largest spread, and tends to converge while gradually reducing the concentration as it approaches the tip of the metal needle 4 serving as the ground electrode. However, since the film hits the tip of the metal needle, there is no spark discharge. And since such a corona discharge is performed through the film 1 simultaneously in the state where the needle points of the plurality of rows of metal needles 4 are pierced into the film 1, the needle points of the metal needles 4 are placed on the film 1. Larger circular holes are opened with a uniform size. In addition, the corona having the above-described spread is generated in a wide range by simultaneous discharge between the metal needles in a plurality of rows, and the film 1 is separated from the surface of the dielectric 5 and is exposed to the corona in a wide range. The film 1 is modified uniformly in a wide range simultaneously with the perforation.

  In the above embodiment, the roll electrode 3 is driven and rotated. However, the rotation of the needle roll 2 that is rotated by the travel of the film 1 is transmitted to the roll electrode 3 by the rotation transmission mechanism, and is rotated by being driven by the needle roll 2. You may make it do. The roll electrode 3 may be a quartz roll made of quartz or a ceramic roll made of ceramic instead of the silicon roll made of silicon as the dielectric 5.

It is a schematic diagram of the Example of this invention. It is a perspective view of the principal part. It is a top view of a needle roll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Film 2 Needle roll 2a Metal body 2b Axis 3 Roll electrode 4 Metal needle 5 Dielectric 6 High frequency high voltage power supply 7 and 8 Holding guide roll

Claims (2)

A plurality of metal needles are arranged in a row in the axial direction of the metal fuselage, and a needle roll projecting on the outer peripheral surface of the metal fuselage so that the row is parallel to the circumferential direction of the metal fuselage, and a roll having a dielectric on the outer surface In addition to disposing the electrodes apart from each other and arranging the holding guide rolls on the downstream and upstream sides of the needle roll, the roll electrode is driven and rotated while high voltage is applied, while the needle roll is grounded and freely rotated. In a state where the film to be perforated is pressed against a plurality of rows of metal needles of the needle roll with the downstream and upstream holding guide rolls, the film is allowed to travel away from the outer surface of the roll electrode, so that the traveling film While rotating the needle roll, the metal needles are sequentially brought into close contact with the film, and the creeping discharge generated along the dielectric surface of the roll electrode is diffused by the rotation of the roll electrode. Corona and is characterized by sequentially opposed to the dielectric surface to modify at the same time to converge to the needle tip of a plurality of rows of metal needle serving as ground electrode for boring a film, drilling of the film by corona discharge by Method. A plurality of metal needles are arranged in a row in the axial direction of the metal fuselage, and a needle roll projecting on the outer peripheral surface of the metal fuselage so that the row is parallel to the circumferential direction of the metal fuselage, and a roll having a dielectric on the outer surface The electrodes are spaced apart from each other, and holding guide rolls are arranged on the downstream side and upstream side of the needle roll. The roll electrode is driven and rotated while high voltage is applied, while the needle roll is grounded. In addition, the film that is to be freely rotated and is to be punched is moved away from the outer surface of the roll electrode while being pressed against the metal needles of the plurality of rows of needle rolls by the downstream and upstream holding guide rolls. While rotating the needle roll with the traveling film, the metal needles are brought into close contact with the film sequentially, and the creeping discharge that occurs along the dielectric surface of the roll electrode is diffused by the rotation of the roll electrode. The corona due to the creeping discharge is converged on the tips of metal needles in multiple rows that are sequentially opposed to the surface of the dielectric to form a ground electrode so that the film can be perforated and modified at the same time. , Film punching device by corona discharge .

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