JP2703151B2 - Corona discharge electrode, corona discharge treatment device, and porous film manufacturing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corona discharge electrode, a corona discharge treatment apparatus provided with the discharge electrode, and a porous film manufacturing apparatus.

[0002]

2. Description of the Related Art For example, when various coating films such as magnetic films are formed on the surface of a polyethylene terephthalate film, it is necessary to enhance the wettability of the film surface. In order to improve such wettability,
For example, a corona treatment is performed on the film surface.

In a conventional corona treatment apparatus, a bar-shaped discharge electrode (for example, a copper electrode) having conductivity and a surface disposed at a desired distance from the electrode are coated with a dielectric thin film. A structure having a counter electrode and a high voltage supply for supplying a high voltage to the discharge electrode is known. In such a corona treatment apparatus, for example, a long polyethylene terephthalate film is supplied between the electrodes with a desired gap provided between the electrodes, and a predetermined high voltage of the discharge electrode is supplied from a high voltage supply source. Corona discharge is generated between the discharge surface of the discharge electrode and the counter electrode. As a result, the surface on the discharge electrode side of the film passing between the electrodes is irradiated with corona to activate the surface, so that the wettability is improved.

However, in the above-described conventional corona treatment apparatus, there is a problem that it is difficult to sufficiently improve the wettability of the film passing between the electrodes because the energy of corona discharge cannot be sufficiently increased. An object of the present invention is to provide a corona discharge electrode capable of performing a uniform and high-energy corona discharge from a discharge surface.

Another object of the present invention is to provide a corona treatment apparatus capable of performing uniform and high-energy corona discharge treatment on the surface of various long films in the width direction thereof. .

Still another object of the present invention is to provide a long organic film with its inherent properties (eg,
Numerous through-holes of fine dimensions selected arbitrarily in the range of sub-μm to more than 10 μm without loss of softness, transparency, strength, etc. (1cm ² The purpose of the present invention is to provide an apparatus for producing a porous film that can be formed at a rate of 5,000 to 200,000 pieces.

[0007]

The corona discharge electrode according to the present invention comprises a conductive electrode body and a large number of diamond particles having sharp corners electrodeposited on the discharge surface of the electrode body. And a child. The electrode body has an arbitrary shape such as a bar shape and a disk shape.
The electrode body is formed of, for example, copper and a copper alloy, or iron and an iron alloy.

As the diamond particles, natural or synthetic diamond particles are used. In particular, synthetic diamond particles are suitable because they have low resistance, high hardness, high strength, and the like, and those having a uniform particle size can be obtained. Said
Diamond particles, it is desirable that the particle size is variation in the particle size less than 5% in 10 to 100 [mu] m.

The diamond particles are electrodeposited on the discharge surface of the electrode body, thereby firmly adhering to the body.
It is. From the viewpoint of performing a uniform corona discharge, it is desirable that the diamond particles adhere to the discharge surface of the electrode body by 70% or more.

[0010] corona discharge treatment apparatus according to the present invention, many of the corona discharge electrode are formed by electrodepositing diamond particles having a sharp corner portion on the discharge side of the bar-type electrode body having conductivity; the electrode Electrodes spaced at a desired distance from each other and having a dielectric layer coated on the surface; a long organic film between the corona discharge electrode and the counter electrode is a desired gap to the electrodes. A supply means for supplying a high voltage to the discharge electrode; and a supply means for supplying a high voltage to the discharge electrode. The discharge electrode has the same configuration as the above-described corona discharge electrode.

The counter electrode has an electrode body and a dielectric layer coated on the surface of the electrode body. The electrode body is formed from various metals such as copper and copper alloy, or iron and iron alloy. As the dielectric material, for example, silicone rubber or ceramic such as alumina, zirconia, mullite, silicon nitride, or the like can be used. It is desirable that the thickness of the dielectric layer be about 2 to 5 mm. In order to coat the ceramic layer on the electrode body, for example, a thermal spraying method is adopted, and after coating the electrode layer with the ceramic layer by thermal spraying, the surface of the ceramic layer is subjected to a polishing treatment to be smooth. Is desirable. It is more preferable that the counter electrode has a structure including a rotatable conductive roll and a dielectric layer coated on the roll surface.

Examples of the organic film include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyvinyl chloride, fluorine resin, polyamide, polycarbonate, and the like.
Various polymer resin films made of polyimide, polyetheretherketone, polyetherketone, elastomer, polyurethane, etc .; various foamed polymer resin films such as foamed polyethylene and polypropylene; foamed paper;
Heat-fusible resin film; two or three layers of polymer resin films of different materials such as laminated polyethylene terephthalate film and polyethylene film, or polyethylene terephthalate film and polypropylene film
Various laminated films such as a laminated film in which layers are laminated, a laminated film in which a woven or nonwoven fabric is laminated on a polymer resin film, a laminated film in which paper is laminated on a polymer resin film, and the like can be used. The high voltage supply means may be either an AC high voltage supply or a DC high voltage supply.
The apparatus for producing a porous film according to the present invention includes a supply unit for supplying a long organic film;

A rotatable first roll having a large number of particles having a Mohs hardness of 5 or more having sharp corners adhered to a surface thereof; and a second roll rotatable in a direction opposite to the roll. 1, a perforation unit in which second rolls are arranged to face each other so that the long film passes between them, and each of the rolls is movably arranged in the arrangement direction thereof;

A pressure adjusting means provided near both ends of one of the rolls of the unit to adjust the pressing force of the rolls on the film;

A corona discharge formed by electrodepositing a large number of diamond particles having sharp corners on a discharge surface of a conductive bar-type electrode body which is disposed at a subsequent stage of the unit and is supplied with a high voltage. Corona discharge treatment means for irradiating a film conveyed from the unit with corona, comprising an electrode and a counter electrode disposed at a desired distance from the electrode and having a dielectric layer coated on the surface thereof Characterized by having;

Examples of the organic film include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyvinyl chloride, fluorine resin, polyamide, polycarbonate, and the like.
Various polymer resin films made of polyimide, polyetheretherketone, polyetherketone, elastomer, polyurethane, etc .; various foamed polymer resin films such as foamed polyethylene and polypropylene; foamed paper;
Heat-fusible resin film; composite film in which a polymer material is mixed with inorganic powder such as silica powder, carbon powder, and alumina powder; material in which polyethylene terephthalate film and polyethylene film, and polyethylene terephthalate film and polypropylene film are laminated Various laminated films such as a laminated film in which two or three layers of different polymer resin films are laminated, a laminated film in which a woven or nonwoven fabric is laminated on a polymer resin film, a laminated film in which paper is laminated on a polymer resin film, etc. Can be used. The organic film has, for example, a thickness of 5
Those having a size of μm to 3 mm are used.

As a supply means for supplying the long film, for example, a roll on which the various films are wound can be used. When the long film is made of a polymer material, a film maker by an inflation method or a film maker by a casting method can be used as the supply means.

The first roll has a structure in which a large number of particles having a Mohs hardness of 5 or more having sharp corners are deposited on the surface of a metal roll main body by electrodeposition or by using an organic or inorganic binder. Examples of the particles having a Mohs hardness of 5 or more include cemented carbide particles such as tungsten carbide, silicon carbide particles, boron carbide particles, sapphire particles, cubic boron nitride (CBN) particles, and natural or synthetic diamond particles. Can be mentioned. Especially,
Synthetic diamond particles have extremely high hardness, strength, etc.
It is preferable because it has excellent durability and can easily obtain one having a uniform particle size. It is desirable that the synthetic diamond particles be attached to the roll body by electrodeposition from the viewpoint of firmly attaching to the metal roll body. It is desirable to use particles having a particle size of 10 to 100 μm and a variation of the particle size of 5% or less. From the viewpoint of forming through holes at a high density in the long organic film, it is desirable that the large number of particles be adhered to the roll body surface at 70% or more.

As the second roll, for example, an iron roll, an iron-based alloy roll, an iron roll having a Ni-plated or Cr-plated surface, or a hard-rolled surface; Coated layers, brass,
A roll having a soft surface such as a roll made of aluminum or copper; As the polymer resin,
Various resins can be used, but urethane resin, silicone rubber, and the like, which have a high buffering effect on the long film, are particularly preferable.

The drilling unit is a box in which the first and second rolls, shafts inserted through the centers of the rolls, and bearings for supporting the vicinity of both ends of the respective shafts are incorporated. It is desirable to be composed of

The first, which constitutes the perforating unit,
The second rolls may be arranged side by side or arranged up and down. Further, the first and second rolls may adopt a form in which, for example, the first roll is fixed, and the second roll is movably disposed above the first roll. When the first and second roll arrangements are adopted, the pressure adjusting means is provided on the upper surface near both ends of the upper second roll.

The perforation unit allows a third roll rotatable in a direction opposite to the first roll to be disposed on the opposite side of the second roll about the first roll. . It is preferable that such a third roll is configured such that a box having a built-in bearing for supporting the shaft is disposed near both ends of the shaft, and inserted into the center of the roll through a shaft.

The pressure adjusting means includes a spring or the like for pressing the box disposed near both ends of the shaft of one of the first and second rolls toward the other roll. It is desirable to have a structure including a compression member. When the third roll is further disposed, the box is provided with a compression member such as a spring for pressing the box disposed near both ends of the shaft of the third roll toward the first roll. It is desirable. The perforation unit provided with the pressure adjusting means allows two, three or more units to be arranged in the transport direction of the long film. As the discharge electrode and the counter electrode constituting the corona treatment means, those having the same structure as the corona treatment device described above are used.

The gap between the counter electrode and the long organic film is preferably in the range of 1 to 5 mm. The reason is that when a high voltage is applied between the discharge electrode and the counter electrode when the gap deviates from the range, the non-through hole previously perforated in the long organic film by the perforation unit is used. This is because it becomes difficult to irradiate a corona with sufficient power. The high voltage supplied to the discharge electrode may be either an AC high voltage or a DC high voltage.

[0025] It is permitted that the static eliminator is disposed downstream of the corona treatment unit. The static eliminator includes, for example, a container containing pure water and an ultrasonic wave generating member for applying ultrasonic waves to the pure water.

[0026]

According to the corona discharge electrode according to the present invention, it includes an electrode body of electrically conductive, and a number of diamond particles with sharp corners which are electrodeposited on the discharge surface of the electrode body,
Therefore to supply high voltage to the electrode body, the electrodepositing
The surface action of numerous diamond particles on the pole body
From the sharp corners of the
The corona can be discharged to the placed counter electrode . As a result, high-energy corona can be discharged.

According to the corona discharge treatment apparatus according to the present invention, a corona discharge electrode formed by electrodepositing a plurality of diamond particles with sharp corners to the discharge surface of the bar-type electrode body having a conductive A counter electrode, which is disposed at a desired distance from the electrode and has a dielectric layer coated on the surface thereof, and a long organic film between the corona discharge electrode and the counter electrode. And a high voltage supply means for supplying a high voltage to the discharge electrode. In such a configuration, when a high voltage is supplied from the power supply to the corona discharge electrode, an electric field increases at sharp corners of the diamond particles of the discharge electrode, and the electric field increases due to concentration of discharge (peripheral effect). , High-energy corona can be discharged toward the counter electrode from each corner. Therefore, when a long organic film is supplied between the electrodes from the supply unit, the film surface on the discharge electrode side is treated with the corona. As a result, the wettability of the surface of the film can be greatly improved as compared with a conventional corona discharge treatment apparatus using a bar-type discharge electrode made of a simple metal. Therefore, when forming a coating film such as a magnetic paint on the corona-treated surface of the corona-treated long organic film, the coating film can be firmly adhered to the film surface.

According to the apparatus for producing a porous film according to the present invention, a supply means for supplying a long organic film; a rotating means having a number of particles having Mohs hardness of 5 or more having sharp corners adhered to the surface. A possible first roll and a second roll rotatable in the opposite direction with respect to the roll, wherein the first and second rolls are arranged to face each other, and the long film is disposed therebetween. Let it pass,
A punching unit in which each of the rolls is movably arranged in the direction in which the rolls are arranged; provided near both ends of one of the rolls of the unit; pressure regulating means for regulating the pressure; disposed downstream of the unit, the high voltage electrodepositing a number of diamond particles having a sharp corner portion on the discharge side of the bar-type electrode body having a conductive supplied A corona discharge electrode formed by the method and a counter electrode disposed at a desired distance from the electrode and covered with a dielectric layer on the surface, and irradiating the film conveyed from the unit with corona. A corona discharge treatment means for producing a long organic film with the inherent properties of the film material (for example, softness,
A large number of through-holes of a fine size arbitrarily selected in the range of sub-μm to several tens of μm are uniformly and densely (1 cm) without substantially impairing transparency and strength) and without breaking.
5,000 to 200,000 per ² ).

That is, the second roll made of metal and the second roll whose surface is covered with a polymer resin layer constituting the perforating unit is processed with an accuracy of several μm to sub μm by the current machining technology. It is possible. However, a large number of Mohs hardness
In the first roll having the above particles (for example, synthetic diamond particles) adhered to the surface, the surface accuracy is limited to several tens of μm even if the particles are adhered and then polished. The first roll and the second roll having such surface finishing accuracy
When a long organic film is passed between the rolls using a unit for punching in which rolls are incorporated, it is difficult to press uniformly over the entire width direction of the film in contact with the rolls. Therefore, the following problems occur when the long film is perforated using the unit.

(1) Due to the displacement of the first roll, there is a portion where the pressing of the long organic film is insufficient, so that a portion that is not perforated occurs, and a through hole or the like is formed uniformly. It will be difficult to do.

(2) The rotation of the first and second rolls becomes intermittent due to the displacement of the first roll, and the smooth rotation of the rolls is hindered. As a result, wrinkles occur over the entire surface of the film.

(3) If the film has a thickness variation, disconnection occurs in the process of passing between the rolls. As a result, it is difficult to continuously form through holes in the long organic film.

In view of the above, according to the present invention, a large number of particles having a Mohs hardness of 5 or more constituting the perforation unit are movably disposed between the first roll and the second roll having a smooth surface. The long organic film passing between the rolls rotating in opposite directions to each other even when the first roll having a surface accuracy of several tens of μm is provided by providing pressure adjusting means near both ends of the roll to be formed. The pressing force to the can be adjusted. That is, the pressing force on the long organic film passing between the rolls can be made uniform throughout the width of the film. In addition, vibration between the rolls accompanying the passage of the film, absorbs dynamic external forces such as impact,
By relaxing, the roll can be rotated smoothly and continuously. Therefore, the following effects can be exhibited.

(1) The first, which rotate in opposite directions to each other,
When passing a long organic film between the second rolls,
Since the pressing force on the film by the rolls can be made uniform over the entire width direction, through holes and the like can be formed in the film uniformly and at high density. In addition, since the perforation operation is performed by a mechanical force of a plurality of particles having a Mohs hardness of 5 or more having sharp corners attached to the surface of the first roll, it is possible to substantially eliminate the inherent characteristics of the film material. , Sub-μm on the film
A large number of uniform through-holes or non-through-holes having fine dimensions arbitrarily selected in the range of from about 10 to several tens of μm can be formed.

(2) Since the rotation of the first and second rolls can be smoothed, the long organic film can be perforated without wrinkles. In addition, since the respective rolls can be rotated at a high speed, the perforation processing capability of the film can be greatly improved.

(3) Even if there is variation in the thickness of the long organic film, through holes or non-through holes are continuously formed in the long organic film without breaking during the passage between the rolls. Can be perforated.

When a large number of through holes are formed in the long organic film by the perforating operation by the unit, a non-through hole may be formed in the film. By passing the film after the perforation operation between the corona discharge electrode and the counter electrode of the corona discharge treatment means and supplying a high voltage (for example, AC high voltage) to the discharge electrode, the discharge electrode Many electrodeposited on the discharge surface of
Electric fields increase at sharp corners of diamond particles (eg, synthetic diamond particles), and high energy corona can be emitted from those corners due to the concentration of discharge (peripheral effects). As a result, the film passing between the electrodes can be irradiated with corona, and the non-penetrated part (remaining thin film part) of the non-penetrated hole can be pierced with corona, so that all the holes of the film can be formed as through holes. .

On the other hand, when a non-through hole is formed by the unit in the long organic film, mechanical damage to the film around the non-through hole can be suppressed as compared with the case where a through hole is formed. By irradiating the film after such perforation operation with corona by the corona discharge treatment means, the non-penetrated portion of the large number of non-through holes is perforated by corona, so that a large number of through holes are formed in the surrounding film portion. Can be formed more uniformly and at a higher density without lowering the mechanical strength of

With the above-described manufacturing apparatus, a large number of uniform through-holes having fine dimensions arbitrarily selected in the range of sub-μm to ten-odd μm are uniformly and densely formed (5,000 per cm 2) on a long organic film. ２００200,000), it is possible to produce a porous film having moisture permeability and air permeability. Such a porous film has suitable moisture permeability and air permeability, and can be used as a material for sanitary materials, medical materials, clothing materials, and the like represented by disposable disposable diapers.

Further, by using a film maker by an inflation method or a film maker by a casting method as a supply means of the long organic film, a porous film made of a polymer material can be integrated from a raw material of the polymer material. In other words, it can be manufactured in-line.

Further, the manufacturing apparatus provided with the corona discharge treatment means may form a non-through hole or the like in the long organic film by a perforation unit mainly composed of friction, A large amount of static electricity is generated, causing surrounding dust to adhere. For this reason, by providing the static elimination means after the corona discharge treatment means, a large amount of static electricity generated on the surface of the long organic film after the perforation treatment can be removed, and dust adheres to the film surface. And can be easily removed.

[0042]

Embodiments of the present invention will be described below in detail with reference to the drawings. Embodiment 1 FIG. 1 is a perspective view showing a corona discharge treatment apparatus according to the present invention, and FIG. 2 is a sectional view taken along the line II-II in FIG.

The counter electrode 1 is, for example, a roll body 2 made of iron.
A dielectric layer 3 made of, for example, alumina coated on the surface of the roll body 2, and a shaft 4 penetrating through the center of the roll body 2 and protruding from both ends of the body 2. ing. The opposing electrode 1 has a shaft 4 projecting from both ends thereof rotated by a driving source (not shown) in synchronization with a supply speed of a long organic film described later, and can be moved up and down by a lifting member (not shown). .

The corona discharge electrode 5 is disposed above the counter electrode 1 at a predetermined distance. The discharge electrode 5 is, for example, a bar-type electrode body 6 made of copper whose lower surface (discharge surface) is covered with a nickel plating layer (not shown).
And a large number of synthetic diamond particles 8 having sharp corners adhered to a nickel plating layer on the lower surface of the electrode body 6 via an electrodeposition layer 7. The synthetic diamond particles 8 have a particle size of, for example, 50 to 60 μm,
It is bonded to the lower surface of the electrode body 6 at an area ratio of 70% or more.

The two high voltage supply terminals 9 support the electrode main body 6 by sandwiching the vicinity of both ends of the bar-shaped electrode main body 6. The lower end of the metal rod 10 is attached to each of the supply terminals 10, and the other end of the metal rod 10 is connected to, for example, a high-voltage transformer and an AC power supply (not shown). The insulators 11 are respectively fitted to the metal rods 10 near the supply terminals 10. A long organic film (for example, a long polyethylene terephthalate film; PET film) 12 is supplied between the discharge electrode 5 and the counter electrode 1 from a film supply roll (not shown).

According to such a configuration, after the distance between the opposing electrode 1 and the corona discharge electrode 5 is adjusted by the elevating member (not shown), the opposing electrode 1 is moved by a driving source (not shown) into an elongated shape which will be described later. While rotating in synchronism with the supply speed of the PET film, a corona discharge is applied from the AC power supply and a high-voltage transformer (both not shown) to a high AC voltage of, for example, 8 to 10 kV through two metal rods 10 and a supply terminal 9 respectively. When the electrode 5 is supplied to the bar-shaped electrode body 6 of the electrode 5, a large number of diamond particles 8 having sharp corners are attached to the discharge surface of the bar-shaped electrode body 6 via the electrodeposition layer 7, and the counter electrode 1 Since the surface is covered with a dielectric layer 3 made of, for example, alumina, a large number of diamonds attached to the discharge surface of the bar-type electrode body 6 via an electrodeposition layer 7 as shown in FIG. Corona 13 from the sharp corners of de particles 8 is uniformly discharged toward the respective opposite electrodes 1.
In the corona 13, the electric field increases at sharp corners of the diamond particles 8, and the corona 13 is discharged from these corners due to concentration of discharge (peripheral effect). This is significantly higher than the corona discharged from the bar-shaped electrode body.

In a state where the corona discharge is stable, a long PET film 12 is supplied from a film supply roll (not shown) with a desired gap between the discharge electrode 5 and the counter electrode 1 with the electrodes 5 and 1 therebetween. Then, the surface of the long PET film 12 on the discharge electrode 5 side is uniformly irradiated with the corona 13 having high energy. As a result, the surface of the long PET film 12 is subjected to corona treatment, and the wettability is significantly improved.

In fact, the wet tension of the PET film which was corona-treated by the corona discharge treatment apparatus provided with the corona-treated electrode having the corona-treated electrode having the bar-shaped electrode body made of a conventional metal alone and the corona-treated PET film according to the first embodiment. Was examined. As a result, the wet tension of the PET film corona-treated by the corona discharge treatment apparatus of Example 1 was 40 d.
yne / cm or more, whereas the wet tension of the PET film corona-treated by the conventional corona discharge treatment device is 35 dyne / cm, and the PET film corona-treated by the corona discharge treatment device of the present invention has wettability. Was remarkably improved.

Further, by synchronizing the rotation speed of the counter electrode 1 with the supply speed of the long PET film 12, the corona 13 is irradiated to the same portion of the dielectric layer 3 on the surface of the counter electrode 1. Therefore, the corona destruction of the dielectric layer 3 can be suppressed and the life of the device can be prolonged. Example 2

FIG. 4 is a front view showing an apparatus for manufacturing a porous film of Example 2, FIG. 5 is a side view showing a main part of the apparatus shown in FIG. 4, and FIG. 6 is along the line VI-VI in FIG. It is sectional drawing. Reference numeral 101 in the figure denotes a bed. A table 102 is provided on the upper surface of the bed 101 except for the vicinity of the right end. On the table 102, two key-shaped frames 103 are installed at predetermined intervals in the width direction of the table 102. The frame 103
Is formed from a lower plate 103a, a side plate 103b, and an upper plate 103c. Side plate 103b of each frame 103
Near the middle of the first box 1 with a built-in bearing 104
05 are respectively fixed. Each frame 103
A first roll 106 is disposed between them. The first
The roll 106 is, for example, 70 to 85 μm as shown in FIG.
A large number of particles (e.g., synthetic diamond particles) 107 having a particle diameter of m and sharp corners and a Mohs hardness of 5 or more
Iron roll body 108 electrodeposited at an area ratio of 0% or more
And a shaft 109 that penetrates the center of the main body 108 and protrudes from both end surfaces of the main body 108.
Both protruding ends of the shaft 109 are connected to the first box 1
05 are respectively supported by the bearings 104. A shaft 109 on one end side (for example, the left end side) of the first roll 106
Penetrates the box 105 and the shaft 1
A gear 111 that meshes with a gear of a drive shaft of a motor (not shown) is mounted on the projecting portion 09. Accordingly, the first roll 106 is rotated, for example, clockwise by driving the motor. Further, a gear 110 is axially mounted on a protruding portion of the shaft 109 located between the gear 111 and the left side surface of the box 105.

Rails 112 and 113 are formed on the side plate 103b of each frame 103 located below and above the first box 105, respectively.
As shown in FIG. 6, a slider 114 (the other slider is not shown) is disposed on each of the lower rails 112 so as to be vertically movable. Each of the sliders 11
4, second boxes 116 each having a built-in bearing 115 are fixed, and can move up and down along the rails 112. A second roll 117 is arranged between the frames 103 so as to face each other so as to be located below the first roll 106. The second roll 117 includes a roll main body 118 made of, for example, stainless steel and having a hard surface, and a shaft 119 that penetrates the center of the main body 118 and protrudes from both end surfaces of the main body 118. Both protruding ends of the shaft 119 are supported by bearings 115 in the second box 116, respectively. One end side (for example, left end side) of the second roll 117
A shaft 119 portion projects through the second box 116, and a gear 120 meshing with the gear 110 of the shaft 109 of the first roll 106 is mounted on the projecting portion of the shaft 119. . Therefore, the second roll 11
7 is the second box 116 and the slider 114
With this, it is arranged to be able to move up and down along the rail 112. Further, by rotating the shaft 109 of the first roll 106 clockwise by the motor, the shaft 119 having the gear 120 meshing with the gear 110 of the shaft 109 rotates counterclockwise, and as a result, Specifically, the second roll 117 rotates counterclockwise.

As shown in FIG. 6, a slider 121 (the other slider is not shown) is arranged on each of the upper rails 113 so as to be vertically movable. A third box 123 containing a bearing 122 is fixed to each of the sliders 121 so as to be able to move up and down along the rail 113. In addition, a third roll 124 is provided between the respective frames 103 by the first roll 10.
6 so as to face each other. The third roll 124 is, for example, an iron roll body 1 having a surface coated with a polymer resin layer 125 such as urethane resin.
26 and the main body 12 through the center of the main body 126.
6 and a shaft 127 protruding from both end surfaces. Both protruding ends of the shaft 127 are supported by bearings 122 in the third box 123, respectively. The shaft 12 on one end side (for example, the left end side) of the third roll 124
The seven parts protrude through the third box 123, and a gear 128 that meshes with the gear 110 of the shaft 109 of the first roll 106 is mounted on the protruding part of the shaft 127. Therefore, the third roll 124 is arranged to be vertically movable along the rail 113 by the third box 123 and the slider 121. Further, the shaft 109 of the first roll 106 is driven by the motor.
By rotating clockwise, the shaft 109 is rotated.
The shaft 127 having the gear 128 meshing with the gear 110 rotates counterclockwise, and consequently the third gear
The roll 124 rotates counterclockwise.

The two frames 103, the two first boxes 105, the first roll 106, the two sliders 112 and 113, the two second boxes 116, the second roll 117, and the two The three boxes 123 and the third roll 124 constitute a perforation unit 129.

A cylindrical body 13 having upper and lower flanges 130 and 131 is provided on the lower wall of the two second boxes 116.
2 are arranged respectively. Each said cylindrical body 132,
As shown in FIG.
The box 116 is fixed to the second box 116 by a plurality of screws 133 screwed to the lower wall. At the lower flange 131 of each of the cylindrical bodies 132, a disk 135 having a hole 134 at the center is arranged, respectively.
Each of the disks 135 is fixed to each of the disks 135 by a plurality of screws 136 screwed to the lower flange 131. In each of the cylindrical bodies 132, a coil spring 137 is housed so as to apply an elastic force in a vertical direction. A rod 139 having a pressure sensor 138 attached to the upper end thereof is inserted into each of the cylindrical bodies 132 through a hole 134 of the disk 135.
Each of the pressure sensors 138 is in contact with the lower end of each of the coil springs 137, and can detect a pressing force on the coil spring 137 due to the rise of each of the rods 139. A disc-shaped guide 140 for smoothly moving the rod 139 up and down is attached to the rod 139 below each of the sensors 138. The lower end of each rod 139 has a ball screw 14
1 are respectively inserted. Each ball screw 1
Reference numerals 41 penetrate the lower plate 103a of the frame 103 and project into recesses (not shown) of the bed 102, respectively. In the recessed portions, casings (the other casing is not shown) 142 each containing a threaded engagement plate (not shown) are provided. The lower end protrusion of the ball screw 141 is screwed to the engagement plate in each of the casings 142. In each of the casings 142, a worm shaft (not shown) that engages with a lower end protruding portion of the ball screw 141 is inserted from the horizontal direction, and a handle is provided at one end of each of the worm shafts. (Not shown) 143 are provided. Therefore, by rotating the handle 143, the ball screw 141 that engages with the worm shaft of the handle 143 rotates, and the rod 139 into which the ball screw 141 is inserted rises (or descends). ing. In this case, when the rod 139 is lowered to a certain distance or more, the disk-shaped guide 140 attached to the rod 139 comes into contact with the inner surface of the disk 135 below the cylindrical body 132 to lower the cylindrical body 132 itself. Let it. Therefore, the second box 116 fixed to the upper end of the cylindrical body 132 is lowered by the slider 114 along the lower part 112 of the rail.

The two cylinders 132, the two disks 135, the two coil springs 137, the two pressure sensors 138, the two rods 139, the two disk guides 140, and the two ball screws 14
1. A first pressure for adjusting a pressing force on a film passing between the first and second rolls 106 and 117 by the two casings 142, the two worm shafts (not shown), and the two handles 143. The adjusting means 144 is included.

A cylindrical body 14 having upper and lower flanges 145 and 146 is provided on the upper walls of the two third boxes 123.
7 are arranged respectively. Each said cylindrical body 147,
As shown in FIG.
The box 123 is fixed to the third box 123 by a plurality of screws 148 screwed to the upper wall. Disks 150 each having a hole 149 in the center are arranged on the upper flange 145 of each of the cylindrical bodies 147, respectively.
The disks 150 are respectively fixed by a plurality of screws 151 screwed from the disks 150 to the upper flange 145. In each of the cylindrical bodies 147, a coil spring 152 is housed so as to apply an elastic force in a vertical direction, and a lower end of each of the coil springs 152 is in contact with an upper wall of the third box 123, respectively. I have. In each of the cylindrical bodies 147, a rod 154 having a pressure sensor 153 attached to a lower end thereof is provided on the disk 1 respectively.
It is inserted through 50 holes 149. Each of the pressure sensors 153 is in contact with the upper end of each of the coil springs 152, and the coil springs 152
Can be detected. A disc-shaped guide 155 for smoothly moving the rod 154 up and down is provided on the rod 154 above each of the sensors 153.
Are attached. A ball screw 156 is inserted into the upper end of each rod 154. Each of the ball screws 156 passes through the upper plate 103c of the frame 103, and
Projecting upwards. On the upper surface of each of the upper plates 103c, there is provided a casing (the other casing is not shown) 157 which incorporates a threaded engaging plate (not shown). An upper end protruding portion of the ball screw 156 is screwed to the engagement plate in each of the casings 157. In each of the casings 157, a worm shaft (not shown) that engages with an upper end protruding portion of the ball screw 156 is inserted from the horizontal direction, and a handle is provided at one end of each of the worm shafts. (Not shown) 158 are provided. Accordingly, by rotating the handle 158, the ball screw 156 that engages with the worm shaft of the handle 158 rotates, and the ball screw 15
6. Lower (or ascend) the rod 154 with the inserted 6
It is supposed to. In this case, when the rod 154 is raised over a certain distance, the disc-shaped guide 155 attached to the rod 154 causes the cylindrical body 147 to move.
The cylindrical body 147 itself is raised by contacting the inner surface of the upper disk 150. For this reason, the third box 123 fixed to the lower end of the cylindrical body 147 is
1 raises along the rail 113.

The two cylindrical bodies 147, the two disks 150, the two coil springs 152, the two pressure sensors 153, the two rods 154, the two disk-shaped guides 155, and the two ball screws Fifteen
6. The second pressure for adjusting the pressing force on the film passing between the first and third rolls 106 and 124 by the two casings 157, the two worm shafts (not shown), and the two handles 158. The adjusting means 159 is constituted.

In front of the perforating unit 129, a supply roll (not shown) for a long organic film is disposed, and the long organic film 160 for the supply roll passes through two feed rolls 161. It is supplied between the first and second rolls 106 and 117 of the unit 129 and between the first and third rolls 106 and 124. A corona discharge treatment mechanism 162 is disposed downstream of the unit 129. The corona discharge treatment mechanism 162 includes a counter electrode 163. As shown in FIG. 7, the counter electrode 163 penetrates a roll body 164 made of, for example, iron, a dielectric layer 165 made of, for example, alumina coated on the surface of the roll body 164, and a center of the roll body 164. And a shaft 166 provided to protrude from both ends of the main body 164. The counter electrode 163
The shafts 166 protruding from both ends are supported by two bearing boxes 167 (the other bearing box is not shown) integrated with each other by a bottom plate. The shaft 167 is
It is configured to be rotated by a drive source (not shown).
The rotation speed of the shaft 167 depends on the length of the long organic film 1.
It is adjusted to synchronize with the supply speed of 60. A ball screw 168 is attached to the lower surface at the center of the bottom plate. The ball screw 168 protrudes into a recess (not shown) of the table 102.
169 in the figure is the lower plate 103 of the frame 103.
This is an extension from a. A casing 170 containing a threaded engagement plate (not shown) is provided in the recess. The lower end protrusion of the ball screw 168 is screwed to the engagement plate in the casing 170. A worm shaft (not shown) that engages with the lower end protrusion of the ball screw 168 is inserted into the casing 170 from the horizontal direction, and a handle 171 is provided at one end of the worm shaft. Therefore, by rotating the handle 171, the handle 1
The ball screw 16 engaged with the worm shaft 71
8 rotates, lowers (or raises) the bearing box 167 to which the ball screw 168 is attached, and the opposed electrode 163 supported by the box 167 is conveyed between feed rolls 161. The organic film 160 is positioned with a desired gap.

Above the opposing electrode 163, a corona discharge electrode 172 is disposed so as to face the opposing electrode 163 at a constant interval in the longitudinal direction of the opposing electrode 163. The discharge electrode 172 is, for example, a bar-type electrode body 1 made of copper whose lower surface (discharge surface) is covered with a nickel plating layer (not shown) as in FIG.
73 and a number of synthetic diamond particles 174 having sharp corners adhered to the nickel plating layer on the lower surface of the electrode body 173 via an electrodeposition layer. The synthetic diamond particles 174 have a particle size of, for example, 50 to 60 μm, and are bonded to the lower surface of the electrode body 172 at an area ratio of 70% or more. Two high voltage supply terminals 175
Support the electrode body 173 by sandwiching the vicinity of both ends of the bar-shaped electrode body. The lower end of the metal rod 176 is attached to each of the supply terminals 175, and the other end of the metal rod 176 is supported by a support member 177. The support member 177 is connected to a DC power supply through, for example, a high-voltage transformer (not shown).
The insulator 178 is fitted to the metal rod 176 near the supply terminal 175, respectively.

An electrostatic removing mechanism 179 is provided at a stage subsequent to the corona discharge processing mechanism 162. The static elimination mechanism 179 is provided on the table 102 and includes a container 180 containing pure water and an ultrasonic generating member (not shown) for applying ultrasonic waves to the pure water. I have. The unit 129, the corona discharge treatment mechanism 1
62 and the container 18
0 and after the container 180, the first and third
And a feed roll 161 for transporting the long organic film 160 having passed between the rolls 106 and 124 of FIG. The two feed rolls 161 located at the front and rear stages of the container 180 have a contact roll 1
81 are arranged. The static electricity removing means 17
9, the feed roll 161, the contact roll 18
A plurality of hot air jet members (not shown) and a winding roll (not shown) for drying the film 160 that has passed through one space are sequentially arranged.

Next, the first and third units of the perforation unit 129 are manufactured by the porous film manufacturing apparatus having the above-described configuration.
An operation of pre-perforating a long organic film between the rolls 106 and 124 and perforating a non-through hole by the corona discharge treatment mechanism 162 will be described with reference to FIGS.

First, by rotating the two handles 143 of the first pressure adjusting means 144 in, for example, a counterclockwise direction, each second box 116 of the drilling unit 129 connected to the upper end of each cylindrical body 132 is moved by a slider. 114
To move down along each rail 112 of each frame 103 so that the bearing 11 in each second box 116
5 is separated from the first roll 106 on the second roll 117 at a sufficient interval. Further, by rotating the two handles 158 of the second pressure adjusting means 159, for example, clockwise, each third box 123 connected to the lower end of each cylindrical body 147 is moved to the slider 121.
To raise each bearing along each rail 113 of each frame 103, so that the bearing 12 in each third box 123
The third roll 124 pivotally supported by 2 is separated from the first roll 106 thereunder at a sufficient distance. In this state, a long organic film 160 made of, for example, polyethylene is wound from a winding roll (not shown) by two feed rolls 161 between the first and second rolls 106 and 117 of the unit 129, the feed rolls 161 and 1st, 3rd
After passing between the rolls 106 and 124, the four feed rolls 161 are used to remove the inside of the container 16 of the static electricity removing means 162.
3 and further through a plurality of hot air jet members (not shown) to wind the leading end of the long organic film 160 around a take-up roll (not shown). In addition, the long organic film 160 is applied to the first and second rolls 106 and 11.
7 when passing through the long organic film 1
60 does not contact the surface of the first roll 106.

After winding the leading end of the long organic film 160 on a take-up roll, the second pressure adjusting means 159
By rotating the two handles 158 in the counterclockwise direction, each third body 147 connected to the lower end of each cylindrical body 147 is rotated.
Box 123 is moved by slider 121 to each frame 1
03 along the respective rails 113 of the third box 123, and the third
The roll 124 is brought into contact with the first roll 106 thereunder. Further, by rotating the respective handles 158 in the same direction, the respective coil springs 152 thereunder are compressed by the respective sensors 152 at the lower ends of the respective rods 154. By the compression of the coil springs 152, a pressing force is applied to the upper wall of each of the third boxes 124, and the third rolls 12 supported by bearings 122 in the third boxes 123 are supported.
4 and the pressing force between the first roll 106 increase. At this time, the third roll 12 is detected by the pressure sensors 152.
By detecting the pressing force (compressive force) between the first and second rolls 4 and 106 and adjusting the rotation of each handle 158 in the forward and reverse directions, the third and first rolls 124 and 106 are adjusted.
The pressing force on the long organic film 160 located therebetween is adjusted. Such second pressure adjusting means 159
By the pressing adjustment to the unit 129, a uniform pressing force is applied over the entire width direction of the long organic film 160 located between the third and first rolls 124 and 106, and a punching operation is performed. Preparation is completed.

After the preparation for the perforating operation is completed, the handle 171 of the corona discharge treatment mechanism 162 is rotated so that the gap between the counter electrode 163 and the lower surface of the long organic film 160 is, for example, about 2 mm. 160 and the corona discharge electrode 1
72 are arranged such that the gap with the upper surface of the long organic film 160 is substantially zero. Further, an ultrasonic wave is applied to the pure water contained in the container 180 of the electrostatic removing unit 179 by an ultrasonic generating member (not shown). Subsequently, simultaneously with rotating the winding roll, by rotating the drive shaft of a motor (not shown), the gear of the drive shaft,
The rotation of the gear 111 of the shaft 109 in the first roll 106 causes the first roll 106 to rotate clockwise. When the first roll 106 rotates, the third roll 124 is rotated in a counterclockwise direction by the rotation transmission of the gear 110 of the shaft 109 and the gear 128 of the shaft 127 of the third roll 124. In this case, since the second roll 117 is sufficiently spaced above the first roll 106, the gear 120 of the shaft 119 of the second roll 117 and the gear 110 of the shaft 109 of the first roll 106 The engagement is released and the second
The roll 117 is not driven by the rotation of the motor,
Free rotation. Thus, the first and third rolls 1
06 and 124 are rotated, so that these rolls 1
06, 124, the long organic film 16
0 is pierced.

That is, as shown in FIG. 7, the first roll 106 has an iron roll body 108 on which a large number of synthetic diamond particles 107 having sharp corners are electrodeposited on the surface at an area ratio of 70% or more. The third roll 124 has a structure having a roll body 126 whose surface is coated with a polymer resin layer 125 such as a urethane resin. As a result, the long organic film 160 is transferred to the first and third rolls 106 and 124.
When passing through the gap, the holes are perforated by the sharp corners of the large number of synthetic diamond particles 107 on the surface of the first roll 106, and the pressing force due to the perforation of the synthetic diamond is reduced by the polymer resin layer 125. For this reason, since the sharp corners of the synthetic diamond particles 107 bite into the long organic film 160, sub-μm to several tens μm
A large number of uniform non-through holes having the fine dimensions of are formed in the long organic film 160 uniformly and at high density. In addition, the second pressure adjusting means 159 adjusts the pressure applied to the unit 129 so that the first surface having a surface accuracy of several tens μm is obtained.
Even if the roll 106 is incorporated, the first and third rolls 1
06, 124, the long organic film 16
Since a uniform pressing force is applied over the entire width direction of 0, dynamic external force such as vibration and impact between the first and third rolls 106 and 124 accompanying the passage of the long organic film 160 is applied. Is absorbed and relaxed, and the first and third rolls 10
6, 124 are smoothly and continuously rotated. as a result,
The long organic film 160 is pre-perforated with a large number of uniform non-through holes having the fine dimensions uniformly and at a high density.

The long organic film 160 pre-perforated by the unit 129 is transferred to a plurality of feed rolls 161.
Is transferred to the corona discharge treatment mechanism 162, and the opposite electrode 163 of the corona discharge treatment mechanism 162 is
60 and a high speed transformer of 8 to 10 kV, for example, through the two metal rods 176 and the supply terminal 175 for corona discharge. When supplied to the bar-shaped electrode body 173 of the electrode 172, a large number of diamond particles 174 having sharp corners are attached to the discharge surface of the bar-shaped electrode body 173 via an electrodeposition layer,
In addition, since the surface of the counter electrode 163 is covered with a dielectric layer 165 made of, for example, alumina, a high-energy corona is formed from sharp corners of a large number of diamond particles 174 of the bar-type electrode body 173 as shown in FIG. 182 are uniformly discharged toward the opposite electrode 163. For this reason, the corona is uniformly irradiated to the non-penetrated portion of each of the non-penetrated holes 183 perforated in the width direction of the film 160, and a large number of uniform through-holes 184 having the fine dimensions are formed in the film 160. 160 are formed. In this corona discharge step, the dielectric layer 16 on the surface of the counter electrode 163 is rotated by rotating the counter electrode 163.
5 can be prevented from being damaged.

The perforated elongate organic film 160 is passed and conveyed in the container 180 of the static elimination mechanism 179 by five feed rolls 161 and two contact rolls 181. The perforation of the long organic film 160 by the unit 129 is mainly performed by friction of the first and third rolls 106 and 124, and the corona discharge treatment mechanism 162 penetrates the non-penetrating hole. Since the discharge induces electrification in the film 160, a large amount of static electricity is generated on the surface of the film 160 after the perforation process, and the surrounding dust adheres. By passing the long organic film 160 after perforation through the container 180 of the static electricity removing means 179 containing pure water, and applying ultrasonic waves to the pure water by an ultrasonic generating member (not shown). , The long organic film 160
Dust adhered to the surface is easily washed away. The long organic film 160 having a large number of through-holes from which dust has been washed away passes through a plurality of hot air jet members (not shown), water on the surface is volatilized and removed, and is further wound up by a winding roll. Therefore, the following effects are exhibited according to the porous film manufacturing apparatus of Example 2 described above.

(1) By adjusting the pressure applied to the perforation unit 129 by the pressure adjusting means 159, the surface accuracy of the electrodeposited synthetic diamond particles 107 on the surface is several tens μm.
Even if the first roll 106 of m is incorporated, a uniform pressing force can be applied over the entire width direction of the long organic film 160 passing between the first and third rolls 106 and 124, A large number of non-through holes 183 can be pre-perforated uniformly and at high density in the long organic film 160. In addition, since the pre-punching operation is performed by mechanical force of a large number of synthetic diamond particles 107 having sharp corners attached to the surface of the first roll 106, the inherent characteristics of the long organic film 160 ( For example, a large number of uniform non-through holes 183 of fine dimensions arbitrarily selected in the range of sub-μm to tens of μm are formed in the long organic film 160 without substantially impairing the strength, softness, transparency). Can be formed.

(2) The first and third rolls 106, 1
Since the rotation of 24 can be made smooth, it is possible to pre-perforate the long organic film 160 without wrinkles. In addition, the first and third rolls 106 and 124 can be rotated at a high speed.
The pre-drilling capacity of the pre-drilling to 60 can be greatly improved.

(3) Even if the long organic film 160 varies in thickness, the first and third rolls 10
Through holes can be continuously formed in the long organic film 160 without being broken during the passage between the first and second organic films 160 and 124.

(4) As shown in FIG. 7, pre-perforation for forming a large number of non-through holes in the long organic film 160 is performed by the perforating unit, and the long organic film is formed by the corona discharge treatment mechanism 162. By uniformly irradiating a high-energy corona 182 to a non-penetrated portion of the non-penetrated hole 183 of the film 160, the perforation unit 129 is formed.
Along with suppressing the occurrence of damage to the film portion around the through hole compared to the case of forming a large number of through holes by only,
A finer through-hole can be formed. As a result, the tensile strength around the through hole is improved, the original characteristics of the film are maintained, and a large number of uniform through holes having a fine dimension of sub μm to several tens μm are formed uniformly and at high density. A continuous porous film can be manufactured continuously.

(5) By passing the long organic film after the perforation treatment through the static electricity removing mechanism, a porous film which does not adhere to dust or the like and is easy to handle can be taken up by a take-up roll.

When a large number of through holes are formed in the long organic film 160 only by the perforating unit 129, not all of the perforated holes are formed as through holes, and some unthrough holes may remain. In such a case, all the holes in the long organic film can be made into through holes by passing the long organic film in which a part of the non-through hole remains through the corona discharge treatment mechanism 162 described above.

In the apparatus for manufacturing a porous film according to the second embodiment, the pressure adjusting means may include the cylindrical body, the disk, the coil spring, the pressure sensor, the rod, the disk guide, the ball screw, Although constituted by the casing, the worm shaft and the handle, the invention is not limited to this. For example, the pressure adjusting means may be formed by an air cylinder. Further, a pressure sensor which is a component of the pressure adjusting means may be omitted. However,
It is desirable to incorporate the sensor in order to perform a more accurate drilling operation.

In the manufacturing apparatus of the second embodiment, synthetic diamond particles are used as a large number of particles having a Mohs hardness of 5 or more to adhere to the surface of the first roll. However, the present invention is not limited to this. For example, a long organic film can be obtained by using cemented carbide particles such as tongue carbide, or particles having another Mohs hardness of 5 or more such as silicon carbide particles, boron carbide particles, and sapphire particles in place of the synthetic diamond particles. In addition, it is possible to form a large number of uniform through holes or non-through holes with fine dimensions arbitrarily selected in the range of sub-μm to more than ten μm uniformly and at high density.

[0076]

As described above in detail, according to the present invention, there is provided a corona discharge electrode capable of performing uniform and high-energy corona discharge from a discharge surface.

Further, according to the present invention, it is possible to perform a uniform and high-energy corona discharge treatment on the surface of various long films in the width direction thereof, thereby significantly improving the wettability of the film surface. It is possible to provide a possible corona discharge treatment device.

Further, according to the present invention, a long organic film can be continuously applied to a long organic film without substantially impairing the inherent properties (eg, softness, transparency, strength, etc.) of the film material and without breaking. A large number of through-holes having fine dimensions arbitrarily selected in the range of sub-μm to more than tens of μm are uniformly and densely packed (1 cm ² The present invention can provide an apparatus for producing a porous film that can be effectively used as a material for sanitary materials, medical materials, clothing materials, and packaging materials typified by disposable disposable diapers.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a corona discharge treatment apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view for explaining corona treatment by the corona discharge treatment device of FIG. 1;

FIG. 4 is a front view showing an apparatus for manufacturing a porous film according to a second embodiment of the present invention.

FIG. 5 is a side view showing a main part of the manufacturing apparatus of FIG. 4;

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5;

FIG. 7 is a sectional view of a main part of a corona discharge treatment mechanism incorporated in the porous film manufacturing apparatus of FIG.

[Explanation of symbols]

1, 163: counter electrode, 3, 165: dielectric layer, 5, 1
72: Corona discharge electrode, 7, 174: Diamond particles, 12, 160: Long organic-based fill, 13, 182 ...
Corona, 101 ... bed, 105 ... first box, 10
6 ... first roll, 116 ... second box, 117 ... second
Roll, 124: third roll, 129: perforating unit, 144, 159: pressure adjusting means, 162: corona discharge treatment mechanism, 179: static electricity removing mechanism, 183: non-through hole, 184: through hole.

Claims (9)

(57) [Claims] An electrode for corona discharge, comprising: a conductive electrode body; and a large number of diamond particles having sharp corners electrodeposited on a discharge surface of the electrode body. 2. A corona discharge electrode formed by electrodepositing a large number of diamond particles having sharp corners on a discharge surface of a bar-type electrode body having conductivity; a desired interval from the electrode. Counter electrode whose surface is covered with a dielectric layer; a supply for supplying a long organic film between the corona discharge electrode and the counter electrode with a desired gap to the electrodes. Means; a high-voltage supply means for supplying a high voltage to the discharge electrode; 3. The corona discharge treatment apparatus according to claim 2, wherein the counter electrode includes a rotatable conductive roll and a dielectric layer coated on a surface of the roll. 4. A supply means for supplying a long organic film; a rotatable first roll having a large number of particles having Mohs hardness of 5 or more having sharp corners adhered to the surface; A second roll rotatable in the opposite direction, wherein the first and second rolls are arranged to face each other so that the long film passes between them, and each of the rolls is A punching unit movably arranged in the arrangement direction of the rolls; provided near both ends of one of the rolls of the unit to adjust the pressing force of the rolls on the film. Pressure adjusting means; formed by electrodepositing a large number of diamond particles having sharp corners on the discharge surface of the conductive bar-type electrode body, which is disposed at the subsequent stage of the unit and is supplied with a high voltage. A corona discharge electrode and a counter electrode disposed at a desired distance from the electrode and covered with a dielectric layer on the surface, for irradiating the film conveyed from the unit with corona. An apparatus for producing a porous film, comprising: a corona discharge treatment means. Wherein said Mohs hardness of 5 or more particles, apparatus for producing a porous film according to claim 4, characterized in that the synthetic diamond particles. 6. The bearing, wherein the first and second rolls of the perforating unit are rotated by shafts inserted through the centers thereof and near both ends of each shaft are built in a box. 5. The apparatus for producing a porous film according to claim 4, wherein the apparatus is pivotally supported on each. 7. The pressure adjusting means includes a spring for pressing the box disposed near both ends of the shaft of the movable roll toward the fixed roll. apparatus for manufacturing a porous film according to claim 4 or 6, wherein. 8. The punching unit further includes the first roll on the opposite side of the second roll with respect to the first roll.
The apparatus for producing a porous film according to claim 4 , wherein a third roll rotatable in a direction opposite to the roll is disposed. 9. The apparatus for producing a porous film according to claim 4 , wherein the counter electrode includes a rotatable conductive roll and a dielectric layer coated on a surface of the roll.