JPH0671598A - Manufacturing device for porous film - Google Patents

Abstract

PURPOSE:To uniformly form a number of recessed parts each of which has the fine opened port width on a long organic film and whose inner surface possesses affinity, by installing the second roll which is covered with a dielectric layer on the surface and can be revolved in the reverse direction to the first roll which has a Moh's hardness of 5 or more and can be revolved and on which a number of dielectric particles adhere. CONSTITUTION:The first roll 9 which is supplied with a high voltage is opposed to the second roll 16 covered with a dielectric layer on the surface, keeping a long organic film 69 interposed. Accordingly, corona electric discharge is generated uniformly between a number of synthetic diamond particles 10 as the dielectric on the surface of the first roll 9 and the dielectric layer of the second roll 16. If a relatively low high-voltage is supplied to the first roll from a high voltage feeding means in this corona electric discharge operation, the corona having a relatively low energy is irradiated uniformly on the long organic film on the first roll on which a number of synthetic diamond particle bite, and each inner surface of a number of recessed parts drilled on the long organic film is affinity-treated by the corona electric discharge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a porous film, and more particularly to an apparatus for producing a porous film suitable as a material for sanitary materials, medical materials, clothing materials, packaging materials and the like.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a film of this type, a general-purpose olefin resin (for example, polyethylene) is filled with a large amount of fine inorganic powder (usually 50% by volume or more based on the resin), It is a method of forming micropores in the form of a labyrinth by forming breakage holes at the interface with the inorganic powder by forming a film and further stretching it in a uniaxial or biaxial direction at a high magnification. However, the conventional manufacturing method described above has the following problems.

(1) Since a large amount of inorganic powder is added,
The original properties of the resin constituting the film (for example, strength, softness, transparency, etc.) are remarkably reduced, and a plastic-like film cannot be obtained substantially.

(2) Since a method of adding a large amount of inorganic powder and stretching at a high magnification in a uniaxial or biaxial direction is adopted, it cannot be applied to a stretchable film such as an elastomer film.

(3) Since the obtained film has microscopic holes of sub-micron order which are continuous with each other in a labyrinth, it has moisture permeability but almost no air permeability.
Subject to usage restrictions.

As another method for producing a porous film, a mechanical punching method such as a needle punching method or a hot melt punching method is also known. The needle punching method is a method in which a heated needle is pressed against a thermoplastic resin film to punch it. The hot melt perforation method is a method in which a thermoplastic resin film is melted and perforated by a heated embossing roll.

However, according to the mechanical perforation method, the size of the holes is as large as about 100 μm, and it is difficult to perforate finer holes, and the holes are dense (for example, 1 cm ^2). There is a problem that it is impossible to perforate more than 500 holes.

An object of the present invention is to provide various long organic films such as polymer materials with sub-μm film without substantially impairing the original properties of the film material (eg transparency, strength, softness, etc.). To 300 μm, the inner surface has a fine opening width arbitrarily selected, and the inner surface has a large number of concave portions having affinity (for example, 1 cm ² 500 to 20
The present invention provides an apparatus for producing a porous film capable of forming (10,000 pieces).

The object of the present invention is to provide a sub-micrometer to 30 film with respect to a long organic film without substantially impairing the original characteristics of the film material (eg, transparency, strength, softness, etc.).
Has a fine opening width arbitrarily selected in the range of 0 μm,
In addition, the inner surface has a large number of concave portions having affinity (for example, 1
cm ² (500 to 200,000 per unit), and a through hole having a diameter smaller than the opening width in which the inner surface has affinity for the remaining thin film portion of the film corresponding to the bottom of the recess. A film manufacturing apparatus is provided.

Another object of the present invention is to provide an apparatus for producing a porous film capable of uniformly forming a large number of the recesses (or the recesses and the through holes connected thereto) without causing wrinkles in the long organic film. To do.

Still another object of the present invention is to continuously form the recesses (or the recesses and the through-holes connected to the recesses) in the long organic film made of the material without breaking.
The present invention provides a porous film manufacturing apparatus capable of uniformly forming a large number of films.

[0012]

A porous film manufacturing apparatus according to the present invention comprises a supply means for supplying a long organic film;

A rotatable first roll having a large number of dielectric particles having sharp Mohs hardness of 5 or more and having a Mohs hardness of 5 or more, and a dielectric layer on the surface rotatable in the opposite direction to the first roll. And a second roll coated with the first roll,
The long organic film is passed between the second rolls,
And a punching unit movably arranged in one or both of the rolls in the arrangement direction thereof;

Pressure adjusting means provided near both ends of any one of the rolls of the perforating unit for adjusting the pressing force of the rolls against the long organic film. A high voltage supply means for supplying a high voltage to the first roll is provided.

Examples of the long organic film include polyolefins such as polyethylene and polypropylene,
Various polymer resin films made of polyester such as polyethylene terephthalate, polyvinyl chloride, fluororesin, polyamide, polycarbonate, polyimide, polyetheretherketone, polyetherketone, elastomer, polyurethane; various foams such as expanded polyethylene and expanded polypropylene Polymer resin film; foam paper; heat-fusible resin film; silica powder as polymer material,
Composite film in which inorganic powder such as carbon powder or alumina powder is mixed; two or three polymer resin films made of different materials such as polyethylene terephthalate film and polyethylene film, polyethylene terephthalate film and polypropylene film are laminated Various laminated films such as a laminated film, a laminated film in which a woven fabric or a nonwoven fabric is laminated on a polymer resin film, and a laminated film in which paper is laminated on a polymer resin film can be used. As the long organic film, for example, a film having a thickness of 1 μm to 10 mm is used.

As a supply means for supplying the long organic film, for example, a roll around which the long organic film is wound can be used. Further, when the long organic film is made of a single polymer resin, a film manufacturing machine by an inflation method or a film manufacturing machine by a casting method can be used as the supplying means.

The first roll comprises a metal roll body,
It has a structure including a large number of dielectric particles having a Mohs hardness of 5 or more, which are attached to the surface of the body of the roll by electrodeposition or an organic or inorganic binder and have sharp corners on the surface.

The metal roll body is formed of, for example, copper and a copper alloy, iron and an iron alloy, or a surface of these metals coated with a nickel plating layer or a chromium plating layer.

The dielectric particles having a Mohs hardness of 5 or more preferably have a dielectric constant of 10 or less. For example, silicon carbide particles (dielectric constant: 9.7), natural or synthetic diamond particles (dielectric constant; 5. 7) etc. can be mentioned. Among these dielectric particles, the natural or synthetic diamond particles are suitable because they have extremely large hardness, strength, etc. and high withstand voltage. In particular, the synthetic diamond particles described above are more suitable because the particles having a uniform particle size are available. The synthetic natural or synthetic diamond particles are preferably attached to the roll body by electrodeposition. At this time, it is preferable that the roll body is made of copper or copper alloy having good electrical conductivity. By electrodepositing the natural or synthetic diamond particles on the roll body in this manner, the diamond particles can be firmly attached to the roll body and the number of synthetic natural or synthetic diamond particles can be increased. The adhesion rate to the roll body can be improved.
Further, if the roll body is formed of copper or copper alloy having good electrical conductivity with a Ni plating layer coated on the surface, the synthetic natural or synthetic diamond particles can be electrodeposited more firmly on the roll body. It will be possible.

The dielectric particles have a particle size of 10 to 350 μm.
It is desirable to use those having a particle size variation of 5% or less in m. The dielectric particles are added to the long organic film by, for example, 1 cm ² From the viewpoint of forming a large number of recesses of 500 to 200,000 per unit and performing uniform corona discharge on the long organic film, it is desirable that 70% or more is attached to the surface of the roll body. The second roll has a structure including a metal roll body and a dielectric layer coated on the surface of the roll body.

The metal roll body is formed of various metals such as iron and iron alloys, or copper and copper alloys, or the surfaces of these metals coated with nickel plating layers and chromium plating layers.

The dielectric layer is formed of, for example, silicone rubber or ceramics such as alumina, zirconia, mullite or silicon nitride. The thickness of the dielectric layer is preferably about 2-5 mm. For coating the ceramic layer on the roll body, for example, a thermal spraying method is adopted. After coating the ceramic layer on the roll body by thermal spraying, it is desirable to polish the surface of the ceramic layer to make it smooth. .

The punching unit has a box in which the first and second rolls, shafts penetrating through the centers of these rolls, and bearings for axially supporting both ends of the shafts are incorporated. It is desirable to compose from.

The first, which constitutes the punching unit,
The second rolls may be arranged side by side in the lateral direction or may be arranged side by side in the vertical direction. However, from the viewpoint of facilitating the assembly of the device and improving the operability, the first and second rolls are vertically arranged. It is desirable to arrange them so as to face each other.

The pressure adjusting means is arranged in the box arranged in the vicinity of both ends of the shaft of one of the first and second rolls, and presses the other roll. It is desirable to have a structure including a compression member such as a spring. In particular, the first roll is fixed, the second roll is movably arranged with respect to the first roll, and the pressure adjusting means is arranged in the box near both ends of the second roll to form the second roll. It is desirable to have a configuration in which is pressed toward the first roll.

The perforating unit allows a third roll, which is rotatable about the first roll and opposite to the second roll, to be rotatable in the opposite direction to the first roll. .

It is preferable that the third roll has a structure in which a box having a built-in bearing inserted therein is inserted in the center of the third roll so as to penetrate the shaft, and a bearing for supporting the shaft is arranged near both ends of the shaft. Further, another compression adjusting means similar to the compression adjusting means is arranged in the box near both ends of the shaft of the third roll, and the third roll is pressed toward the first roll. Is desirable.

When the third roll is added to the punching unit, the first roll is arranged between the second and third rolls in a freely movable state, that is, in a free state, and It is desirable that the compression adjusting means can press against the first roll from either side of the second roll or the third roll. In such an arrangement, (1) the long organic film is passed through between the third roll and the first roll, and the first,
A mode in which perforation and corona discharge treatment are performed not only between the second rolls but also between the first and third rolls, and (2) a mode in which the third roll is used as a pressing roll against the first roll are adopted. can do.

When the form (1) is adopted, the third roll has a structure similar to that of the second roll. Further, in the case of adopting the form (2), the third roll is the first roll to which the high voltage is supplied.
In order to insulate the roll from the roll, at least a surface of which is made of an insulating material, for example, a ceramic roll or a metal roll whose surface is coated with a ceramic layer or a high voltage resistant polymer resin layer is used.

The high voltage supply means is coated, for example, on the outer periphery of the bearing that supports the shaft of the first roll, and an insulating material layer for electrically insulating the box, and the box. An insulating cylinder inserted from the surface through the box and the insulating material layer, a high-voltage supply terminal inserted so that the tip of the insulating cylinder contacts the bearing, and the supply terminal It is desirable to have a configuration with a high voltage supply source (for example, AC power supply or DC power supply) connected thereto. In particular, it is desirable to further provide a control member for controlling the high voltage supplied to the first roll on the connection path between the high voltage supply terminal and the high voltage supply source. As the insulating material used for the insulating material layer and the insulating cylinder, for example, a polymer material, ceramics or the like can be used. Of these, engineering plastics such as polycarbonate resin having excellent high voltage resistance and strength are preferable.

The perforating unit provided with the pressure adjusting means and the high voltage supplying means allows two or three or more units to be arranged in the transport direction of the long organic film. For example, 1 when arranging two units
First roll of row unit and first of second row unit
A large number of dielectric particles having a Mohs hardness of 5 or more attached to the roll may have different particle sizes. When two units are arranged, the long organic film is perforated between the rolls of the units in the first row (for example, between the first and second rolls), and then the long organic film is formed. Between the rolls of the unit in the second row (for example, between the first and second rolls), the surface of the film opposite to the perforated side has the first roll (a large number of dielectric particles having a Mohs hardness of 5 or more attached thereto The film may be passed through so as to come into contact with the roll, and the perforating operation may be performed from the front and back surfaces of the film.

It is allowed that the static eliminating means is arranged at the subsequent stage of the punching unit. The static electricity removing means is composed of, for example, a container containing pure water and an ultrasonic wave generating member for applying ultrasonic waves to the pure water.

[0033]

According to the porous film manufacturing apparatus of the present invention, a supply means for supplying a long organic film;
A rotatable first roll having a large number of dielectric particles having sharp Mohs hardness of 5 or more and having a Mohs hardness of 5 or more, and the first roll.
A second roll having a surface rotatable in the opposite direction to the roll with a dielectric layer, wherein the long organic film is passed between the first and second rolls, and A piercing unit in which either one of the rolls is movably arranged in the arrangement direction thereof; provided in the vicinity of both ends of one or both of the rolls of the piercing unit. The polymer resin is controlled by the one unit by including a pressure adjusting means for adjusting a pressing force to the long organic film; and a high voltage supplying means for supplying a high voltage to the first roll. For various long organic films including, the original characteristics of the film material (eg transparency, strength,
Sub μm-300μ with almost no loss of softness)
m has a fine opening width arbitrarily selected in the range of m, and the inner surface has a large number of concave portions having an affinity (for example, 1 cm).
² (500 to 200,000 pieces per one) can be continuously formed.

That is, the second roll having the surface of the perforating unit coated with the dielectric layer can be processed with an accuracy of several μm to sub μm in the current machining technology. However, in the first roll having a large number of dielectric particles (for example, synthetic diamond particles) having a Mohs hardness of 5 or more, which constitute the unit, adhered to the surface, even if polishing is performed after the particles are adhered, the surface thereof is The accuracy is limited to several tens of μm. When a long organic film is passed between the rolls by using a unit for perforation configured by incorporating the first roll with such surface finishing accuracy together with the second roll, the entire width direction of the film in contact with the rolls. It becomes difficult to press uniformly over the entire length. Therefore, when the long organic film is perforated using the unit, the following problems occur. (1) Due to the displacement of the first roll, a portion where the long organic film is insufficiently pressed is difficult to uniformly form the recesses having the desired depth.

(2) Due to the displacement of the first roll, the rotation of the first and second rolls becomes intermittent, and smooth roll rotation is hindered. As a result, wrinkles are generated on the entire surface of the long organic film.

(3) If the length of the long organic film varies, the wire breaks in the process of passing between the rolls. As a result, it becomes difficult to continuously form the recesses in the long organic film.

Therefore, according to the present invention, the first roll having a large number of dielectric particles having a Mohs hardness of 5 or more (for example, synthetic diamond particles) attached to the surface and the first roll capable of rotating in the opposite direction to the first roll. By providing a perforating unit having two rolls and pressure adjusting means arranged in the vicinity of both ends of either one of the rolls, even if the first roll having a surface accuracy of several tens of μm is incorporated, they are opposite to each other. The pressing force applied to the long organic film passing between the first and second rolls rotating in the direction can be adjusted. That is, the pressing force applied to the long organic film passing between the rolls can be made uniform in the entire width direction of the film.
Further, it is possible to smoothly and continuously rotate the rolls by absorbing and relaxing dynamic external force such as vibration and impact between the rolls as the film passes.

That is, while rotating the first and second rolls in the perforating unit whose pressure is adjusted by the pressure adjusting means, the long organic film is passed between the first and second rolls. A high voltage is supplied from a high voltage supply means to the first roll having the large number of synthetic diamond particles attached to its surface. At this time, the first and second
Since the rolls are pressed against each other uniformly over the entire length direction, when the long organic film passes between the rolls, sharp corners of a large number of synthetic diamond particles attached to the first roll are formed. Is uniformly perforated into the film to make mechanical perforations, and a recess having a fine opening width, for example, an inverted conical recess having a fine opening width is not impaired without impairing the original properties of the film (for example, transparency, strength, softness, etc.). Many are formed. At the same time, since the first roll to which a high voltage is supplied is opposed to the second roll having the surface covered with the dielectric layer with the long organic film interposed therebetween, the dielectric on the surface of the first roll is Corona discharge is uniformly generated between the large number of synthetic diamond particles and the dielectric layer of the second roll. In such corona discharge operation,
When a relatively low high voltage is supplied from the high voltage supply means to the first roll, corona of relatively low energy is evenly distributed in the long organic film in which a large number of synthetic diamond particles of the first roll are bitten. Because it is irradiated to
The inner surface of a large number of recesses perforated in the long organic film is subjected to an affinity treatment by the corona discharge. On the other hand, when a relatively high voltage is supplied to the first roll from the high voltage supply means in a state where the large number of synthetic diamond particles are digged into the long organic film to form the recesses, the synthetic diamond is Due to the concentration of the electric field at the sharp corners of the particles, that is, the edge effect, the residual thin film portion located at the bottom of the concave portion of the long organic film is mainly irradiated with the high-energy corona to form holes. Therefore, a cylindrical through hole having a diameter smaller than the opening width of the recess is formed in the remaining thin film portion. In addition, the inner surfaces of the large number of recesses and the inner surfaces of the through-holes perforated in the long organic film are subjected to an affinity treatment by the corona discharge.

Further, since the pressure adjusting means adjusts the pressing force between the first and second rolls of the perforating unit and further prevents the first roll from bending, the first and second rolls are prevented. Since the second roll can be smoothly rotated and the high speed rotation of each roll can be performed,
The long organic film can be remarkably improved in processing capability for perforation and corona discharge without wrinkling.

Further, even if there is a variation in thickness of the long organic film, it is possible to prevent the long organic film from breaking in the process of passing between the rolls by the above-mentioned action, A large number of recesses and the like can be continuously formed on the shaku organic film.

Further, a third roll is added to the punching unit, the first to third rolls are movably arranged, and the second and the second rolls arranged to face each other with the first roll as the center. By pressing the third roll toward the first roll by the pressure adjusting means, it is possible to effectively prevent the occurrence of bending of the first roll in the longitudinal direction. as a result,
It is possible to further greatly improve the processing capability of perforation and corona discharge in the long organic film.

According to the manufacturing apparatus as described above, the long organic film has a sub-μm to 300 μm range without substantially impairing the original characteristics of the film material (eg, transparency, strength, softness, etc.). It has a fine opening width that is arbitrarily selected and has a large number of recesses (for example, 1 cm ² ) where the inner surface has affinity. Since it can be formed with 500 to 200,000 pieces per unit), it has excellent wettability, does not permeate water, bacteria, and miscellaneous substances, and permeates gas such as oxygen gas and carbon dioxide and water vapor, and gas permeation amount and water vapor. It is possible to manufacture a porous film having controllability of the amount of permeation. Such a porous film is a base film for forming a coating film described below, a film for lamination or a packaging material for maintaining freshness of fruits and vegetables,
It can be effectively used for various packaging materials such as oxygen scavengers, stretchable base films for effervescent agents, surgical gloves, etc.

That is, since the porous film has a large number of recesses having an affinity on the inner surface, the wettability is remarkably improved as compared with an organic film having no recesses. Further, since the porous film is formed with a large number of fine concave portions, when an adhesive layer or the like is applied to the opening side of the large number of concave portions, the adhesive layer or the like is applied to the large number of concave portions. Shows excellent anchor effect. Such a porous film can be used as a coating film forming base film and a laminating film described below.

(1) The wettability of the porous film in the large number of minute concave portions is obtained by applying a resin solution containing magnetic powder to the surfaces of the large amounts of concave portions of the porous film on the opening side and drying it. Also, the anchor effect allows the porous film to be coated with a magnetic layer having excellent adhesion. Therefore, the porous film coated with the magnetic layer can be used as a magnetic film. In particular, since the magnetic powder can be embedded in a large number of concave portions of the porous film, the packing density of the magnetic powder can be improved even if the thickness of the magnetic layer is reduced. As a result, it becomes possible to obtain a thin magnetic film such as a prepaid card capable of high density recording.

(2) Ink is applied to the surface of the porous film on the opening side of the large number of concave portions, and the ink is dried to wet the fine concave portions of the porous film and achieve the anchor effect. An ink layer having excellent adhesion can be coated on the film. Therefore,
The porous film coated with the ink layer can be used as an ink ribbon. In particular, since the ink can be filled also in a large number of concave portions of the porous film, the amount of the ink applied can be improved even if the thickness of the ink layer is reduced. As a result, good print recording is possible and a thin ink ribbon can be obtained.

(3) Laminating an organic film (first organic film) incompatible with the adhesive and an organic film (second organic film) compatible with the adhesive by using a predetermined adhesive In doing so, a large number of fine recesses are formed in the first organic film to form a porous film, and the adhesive is applied to the opening-side surface of the recesses of the porous film. 2 Adhere and stack organic films. In such a lamination, the porous film is well adhered with the adhesive due to the wettability of the numerous fine recesses and the anchor effect. On the other hand, the second organic film has compatibility with the adhesive. As a result, it is possible to obtain a laminated film in which the first and second organic films are favorably adhered by the adhesive.

In addition, since the porous film has a fine opening width in the organic film and has a large number of concave portions whose inner surface exhibits affinity, the porous film has a plurality of concave portions corresponding to the bottom portions of the concave portions. Water, bacteria,
It is possible to control the gas permeation amount and the water vapor permeation amount by permeating gases such as oxygen gas and carbon dioxide gas and water vapor without permeating bacteria. Specifically, since the gas of the film material is dissolved and diffused in the remaining thin film portion of the organic film, the permeation amount of oxygen gas and carbon dioxide gas is significantly increased. Further, water vapor adheres to a large number of fine and inner surfaces of the organic film that are compatible with the recesses, and the diffusion of the water vapor of the film material occurs in the remaining thin film portion at the bottom of the recesses, resulting in a large amount of water vapor permeation. Is increased to. Therefore, by controlling the opening width and the number of the recesses and the thickness of the remaining thin film portion corresponding to the recesses, the oxygen gas, carbon dioxide gas permeation amount and water vapor permeation amount are controlled functionality. A porous film having is obtained. The oxygen gas permeation amount of the porous film is, for example, 1
0 ³ ~ 10 ⁷ cc / m ² ・ Has 24 hours and 25 ° C.
The porous film having such functionality can be applied to the packaging material described below.

(1) For example, a porous film obtained by forming a large number of fine concave portions having an affinity for the inner surface on an organic film made of a polyethylene film, a biaxially oriented polypropylene film, a polypropylene film, a polyethylene terephthalate film, etc. It can be used as a holding packaging material.

That is, when the fruits and vegetables are hermetically packaged, the oxygen concentration in the packaging material decreases due to the breathing action of the fruits and vegetables themselves, and the carbon dioxide concentration increases. Therefore, the respiration of the fruits and vegetables is suppressed and the freshness of the fruits and vegetables is maintained by the decrease of the oxygen amount and the increase of the carbon dioxide concentration. In this case, the film, which is the material of the packaging material, is controlled so that individual fruits and vegetables can breathe normally, and the minimum amount of oxygen that can maintain life is transmitted, and the concentration of carbon dioxide gas generated by breathing does not become excessive. And permeation of water vapor that causes dew condensation that causes bacterial growth.

For example, when a polypropylene film is formed with a large number of fine concave portions having an affinity for the inner surface to produce the porous film, the permeation amount of oxygen gas and carbon dioxide gas is significantly increased as described above. The amount of water vapor permeation is increased, and the permeation of water and various bacteria is prevented. Therefore, the packaging material formed from the porous film can permeate oxygen gas, and can permeate the carbon dioxide gas generated by respiration of the fruits and vegetables to suppress an excessive carbon dioxide concentration, and further cause dew condensation. Water vapor that becomes As a result, the packaging material made of the porous film has an excellent effect of maintaining freshness of fruits and vegetables.

(2) A multi-layered film obtained by laminating a first film made of, for example, polyethylene or polypropylene and a second film made of, for example, polyethylene terephthalate, is provided with a large number of fine recesses having an affinity for the inner surface on the second film side. The porous film formed over the first film can be used as a low-cost oxygen absorber packaging material. The concave portion formed in the porous film becomes a penetrating portion in the second film portion.

That is, the conventional oxygen scavenger packaging material is a polyethylene terephthalate film or a polyethylene film two-layer film having a large number of through holes formed by a needle punching method or the like, and Japanese paper is provided on the polyethylene film side of the two-layer film. It has a laminated structure. Therefore, the price increases because the Japanese paper is laminated. When the packaging material contains an oxygen scavenger and the packaging material is stored in a closed container together with the liquid contents, the contents enter inside through the through holes of the packaging material and the holes of Japanese paper. As a result, there is a problem that the oxygen absorber contained in the packaging material is deteriorated.

The porous film is formed into a bag shape so that the first film having the remaining thin film portion is on the inner side to prepare a packaging material for oxygen scavenger. Such a packaging material has a characteristic that external oxygen passes through a large number of penetrating portions of the second film, and is further permeated by the gas of the film material in the remaining thin film portion corresponding to the concave portion of the first film by dissolution and diffusion. Have.

Therefore, when an oxygen scavenger is stored in the packaging material and the packaging material is loaded into a closed container having a high gas barrier property together with contents such as confectionery, oxygen in the container permeates the packaging material and Absorbed by oxygen absorber. as a result,
Since the atmosphere in the container can be made to contain almost no oxygen, it is possible to prevent quality deterioration due to oxidation of the contents.

Further, since the packaging material has high water permeation resistance, even if the content is a liquid, the content penetrates into the inside through the packaging material and deteriorates the oxygen scavenger therein. Can be prevented. As a result, liquid and solid contents can be stored for a long period of time only by preparing several kinds of packaging materials.

(3) In the porous film, the permeation amount of oxygen gas and carbon dioxide gas can be controlled by controlling the opening width of the recesses, the number of the recesses and the thickness of the remaining thin film portion. Alternatively, it can be used as a carbon dioxide gas filter. (4) An organic film, for example, a porous film obtained by forming a large number of fine recesses on the inner surface of which an affinity is present in an elastomer film can be used as a stretchable base film for an emulsifying agent.

That is, the poultice is applied to the skin and used for the purpose of anti-inflammatory or absorption of secretions. As the above-mentioned effervescent agent, one having a structure in which a pasty external preparation containing a powder chemical is applied to a cloth has been conventionally known. However, in the emulsifying agent having such a structure, the cloth is not sufficiently permeable to water vapor. For this reason, if the above-mentioned patch is used by sticking it to the skin during sleep, the sweat generated from the skin does not pass through the patch and remains as it is, giving an unpleasant feeling.

In the poultice prepared by applying the external preparation to the porous film, the porous film has high water vapor permeability. For this reason, the above-mentioned patch can permeate the sweat generated from the skin and volatilize satisfactorily, and can be used well even during sleep.

(5) The porous film in which a large number of fine recesses are formed in the elastomer film described in (4) above does not allow water, bacteria, and miscellaneous bacteria to permeate therethrough, can increase the amount of water vapor permeation, and has a further high stretchability. Have sex. Therefore, it can be used as a surgical glove.

Further, according to the above-mentioned manufacturing apparatus, the long organic film can be used in the sub-μm to 300 μm range without substantially impairing the original characteristics of the film material (eg, transparency, strength, softness, etc.). It has a fine opening width that is arbitrarily selected and has a large number of recesses (for example, 1 cm ² ) where the inner surface has affinity. (500 to 200,000 pieces per)
Can be formed with, the remaining thin film portion of the film located at the bottom of the recess has a diameter smaller than the opening width, and because the inner surface can be through-holes showing affinity,
Pores that have excellent wettability, suppress or prevent permeation of water, bacteria, and other bacteria, and permeate gases such as oxygen gas and carbon dioxide and water vapor to control the gas permeation amount and water vapor permeation amount. Quality films can be produced. Such a porous film is a base film for forming a coating film, a laminating film or a packaging material for maintaining freshness of fruits and vegetables, various packaging materials such as a packaging material for oxygen scavenger, a stretchable base film for an adhesive, and a surgical film. It can be effectively used for gloves.

Particularly, polyethylene film, biaxially oriented polypropylene film, polypropylene film, polyethylene terephthalate film (OPP film), etc., used as a packaging material for maintaining freshness of fruits and vegetables are inherently more water vapor permeable than elastomer films and polyurethane films. The amount is extremely small. The organic film is subjected to perforation and corona discharge treatment by the manufacturing apparatus according to the present invention to form a large number of fine recesses each having an affinity for the film and a through hole connected to the bottom of the recess to form a contact. A large number of fine and inner surfaces of the organic film adhered to the concave portions showing affinity, and the inner surface perforated in the residual thin film portion diffuses through the through-holes showing affinity, thereby increasing the amount of water vapor permeation. A significantly increased porous film can be produced. For example, a porous film obtained by forming the above-mentioned recesses and through holes in a biaxially oriented polypropylene film has a water vapor transmission amount increased by about three orders of magnitude as compared with an untreated biaxially oriented polypropylene film. As a result, the porous film can be effectively used as a packaging material for keeping freshness of fruits and vegetables, which can effectively prevent clouding and dew condensation due to water vapor.

Further, in the porous film, the opening width of the recesses, the number of the recesses, the thickness of the remaining thin film portion of the film located at the bottom of the recess, and the through holes (eg, cylinders) formed in the remaining thin film portion. Shape through hole) diameter,
Particularly, by controlling the thickness of the remaining thin film portion and the diameter of the through hole, the mean free path of the gas that permeates the through hole can be controlled. As a result, for example, it can be used as an oxygen gas filter that selectively permeates only oxygen gas in the air, or a carbon dioxide gas filter that selectively permeates only carbon dioxide gas.

Further, in the porous film production apparatus according to the present invention, the film production machine by the inflation method or the film production machine by the casting method is used as the supplying means, so that the porous film can be consistently produced from the raw material of the polymer material. That is, it is possible to manufacture in-line.

In the porous film manufacturing apparatus according to the present invention, when the first roll has a structure in which a roll main body and a large number of natural or synthetic diamond particles are attached to the roll main body by electrodeposition, The synthetic diamond particles have extremely high hardness and strength, and have a withstand voltage of 3.5 × 10 ^6. Since it is as high as V / cm, perforation and corona discharge treatment can be stably performed for a long period on the above-mentioned long organic film. Moreover, since the large number of natural or synthetic diamond particles can be firmly adhered to the roll body, the first roll having excellent durability can be realized. In particular, when the roll body is used as a Ni
If formed from copper or copper alloy of good electrical conductivity coated with a plating layer, the numerous natural or synthetic diamond particles can be electrodeposited more firmly by the roll body,
It is possible to realize the first roll having extremely excellent durability.

In the porous film manufacturing apparatus according to the present invention, if two or more of the perforation units provided with the pressure adjusting means and the high voltage supplying means are arranged in the conveying direction of the long organic film, By varying the particle diameters of a large number of dielectric particles having a Mohs hardness of 5 or more attached to the first roll of the unit of the first row and the first roll of the unit of the second row, the perforation diameter of the long organic film is increased. A large number of different through holes can be formed uniformly.

In the apparatus for producing a porous film according to the present invention, recesses and the like are formed in a long organic film made of various insulating materials by the perforation unit mainly composed of friction and corona treatment for inducing charging. It is a thing. For this reason, a large amount of static electricity is generated on the surface of the film after perforation and corona discharge treatment, and dust around is attached. Therefore, by providing the static electricity removing means at the latter stage of the unit, a large amount of static electricity generated on the surface of the long organic film after the perforation treatment can be removed, and dust is easily attached to the film surface. Can be removed. In particular, it is very easy to wash away dust adhering to the film surface after the perforation treatment by comprising a container containing pure water as the static electricity removing means and an ultrasonic wave generating member for applying ultrasonic waves to the pure water. be able to.

[0067]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a front view showing an apparatus for producing a porous film according to this embodiment, FIG. 2 is a side view showing an essential part of the apparatus for producing the film shown in FIG. 1, and FIG. 3 is taken along line III--III in FIG. Sectional view, Figure 4
FIG. 5 is an enlarged cross-sectional view of a main part of the first roll in the manufacturing apparatus of FIG. 1, and FIG. 5 is a schematic diagram for explaining a high voltage supply mechanism that supplies a high voltage to the first roll in the manufacturing apparatus of FIG.

Reference numeral 1 in the figure is a bed. Bed 1
A table 2 is provided on the upper surface except near the right end of the table. On the table 2 are two key-shaped frames 3
Are installed at predetermined intervals in the width direction of the table 2. The frame 3 is formed of a lower plate 3a, side plates 3b and an upper plate 3c. Rails 4 are formed on the side plates 3b of each frame 3 in the vertical direction. As shown in FIG. 3, each rail 4 has a first slider 5 (the other slider is not shown).
Are arranged so that they can move up and down. A first box 7 having a bearing 6 built therein is fixed to each slider 5 so that it can be moved up and down along the rail 4. An insulating ring 8 made of, for example, a polycarbonate resin for insulating the first box 7 around each bearing 6 (the other insulating ring is not shown).
Are fitted together. A first roll 9 is arranged between the frames 3. As shown in FIGS. 2 and 4, the first roll 9 has a large number of dielectric particles having a Mohs hardness of 5 or more (for example, synthetic diamond particles; a dielectric constant of 5.7) having a grain size of 50 to 60 μm and sharp corners. ) 10
A roll body 11 made of copper and having a surface area ratio of 70% or more and an electrodeposition layer 11a made of Ni attached thereto, and the body 1
1 and a shaft 12 penetrating the center of the body 1 and protruding from both end surfaces of the main body 11. Both protruding ends of the shaft 12 are axially supported by the bearings 6 in the first box 7. Therefore, the first roll 9 is attached to the rail 4 by the first box 7 and the first slider 5.
It is arranged so that it can move up and down. Two stoppers (not shown) are provided on the rail 4 portion corresponding to the first slider 5, and the vertical movement of the first slider 5 is restricted by the two stoppers to a range of, for example, 5 mm. It is like this.

As shown in FIG. 3, the rail 4 of each side plate 3b located below the first box 7 is provided with a second
Sliders 13 (the other slider is not shown) are arranged so as to be vertically movable. Each slider 1
A second box 15 having a bearing 14 built therein is fixed to each of the rails 3, and can be moved up and down along the rail 4. A second roll 16 is disposed between the frames 3 so as to face the first roll 9 below the first roll 9. As shown in FIGS. 3 and 4, the second roll 16 is an iron roll body 1 having a surface covered with a dielectric layer 17 made of alumina and having a thickness of about 3 mm, for example.
8 and a shaft 19 penetrating the center of the body 18 and protruding from both end surfaces of the body 18. The dielectric layer 17 is formed by spraying alumina on the surface of the roll body 18 and then polishing the surface of the sprayed alumina layer. The projecting ends of the shaft 19 are
The bearings 14 in the second box 15 are pivotally supported. Therefore, the second roll 16 is attached to the rail 4 by the second box 15 and the second slider 13.
It is arranged so that it can move up and down. The second roll 16
Of the shaft 19 on one end side (for example, the left end side) of the motor is projected through the second box 15, and a protruding portion of the shaft 19 is provided with a gear (not shown) of a drive shaft of a motor (not shown). The meshing gear 20 is mounted on the shaft.

As shown in FIG. 3, the rails 4 of the side plates 3b located above the first box 7 are provided with a third rail.
A slider 21 (the other slider is not shown) is arranged so as to be vertically movable. Each slider 2
A third box 23 containing a bearing 22 is fixed to each of the rails 1, and can be moved up and down along the rail 4. Further, a third roll 24 is arranged between the frames 3 so as to face the first roll 9 so as to be located above the first roll 9. As shown in FIG. 3, the third roll 24 includes an iron roll main body 26 having a surface covered with a dielectric layer 25 made of alumina and having a thickness of about 3 mm, and the main body 26 passing through the center of the main body 26. 26 and a shaft 27 projecting from both end surfaces thereof. Both protruding ends of the shaft 26 are axially supported by the bearings 22 in the third box 23, respectively. Therefore, the third roll 24
Is vertically movably arranged along the rail 4 by the third box 23 and the third slider 21. A shaft 27 portion on one end side (for example, the left end side) of the third roll 24 penetrates the third box 23 and projects,
Further, a gear 28 that meshes with a gear (not shown) of the drive shaft of the motor is mounted on the protruding portion of the shaft 27.
In a state where the second roll 16 is pressed against the first roll 9 by a first pressure adjusting means described below and the third roll 24 is pressed against the first roll 9 by a second pressure adjusting means described below, the motor By the shaft 1 of the second roll 16
9 and the shaft 26 of the third roll 24 are rotated in the clockwise direction, for example, the second and third rolls 16, 24 are rotated.
The first roll 9, which is vertically movable between the first and second rolls, is adapted to be rotated counterclockwise.

The two frames 3, the two first boxes 7, the first roll 9, the two second boxes 15, the second roll 16, the two third boxes 23, and the third roll 24, the sliders 5, 1
A unit 29 for punching is constituted by 3 and 21.

As shown in FIG. 3, screw holes 30 are formed in the front wall of each of the first boxes 7.
Insulating cylinders 32 made of, for example, polycarbonate resin, each having a flange portion 31 abutting against the front surface of the box 7, are screwed into the screw holes 30, and the tips of the insulating cylinders 32 are attached to the first box. 7 penetrates the insulating ring 8 around the bearing 6 built into the bearing 7, and reaches the outer peripheral surface of the bearing 6. A high-voltage supply terminal 34 having a flange 33 that abuts the flange 31 in each of the insulating cylinders 32.
Are respectively inserted, and the tips of the terminals 34 are connected to the bearing 6. In the collar portion 33 of each terminal 34,
As shown in FIG. 5, the cables 35a and 36b are connected to a high voltage transformer 36 as a high voltage control member. The high voltage transformer 36 is connected to, for example, an AC power supply 38 via a cable 37. The insulating ring body 8, the insulating cylindrical body 32, the high-voltage supply terminal 34, the high-voltage transformer 36, the AC power supply 38, and other members constitute a high-voltage supply mechanism as high-voltage supply means. An AC voltage is supplied from the AC power supply 38 in the high voltage supply mechanism to the high-voltage transformer 36, where it is controlled to a desired high voltage, and the high voltage is supplied to the cables 35a, 3a.
When supplied to each of the terminals 34 through 5b, each of the terminals 34 is connected to each of the insulating boxes 3 with respect to each of the first boxes 7.
2 and the tip of each of the terminals 34 has the bearing 6
Since it is in contact with, it is possible to supply a high voltage only to the first roll 9.

A cylindrical body 41 having upper and lower flanges 39 and 40 is arranged on the lower wall of each second box 15. As shown in FIG. 3, each of the cylindrical bodies 41 has a plurality of screws 42 screwed to the lower wall of the second box 15 from the upper flange 39 so that the second box 1
It is fixed to 5, respectively. A disc 44 having a hole 43 in the center is arranged on the lower flange 40 of each of the cylinders 41, and each disc 44 is formed by the disc 44.
A plurality of screws 45 screwed to the lower flange 40 from the
It is fixed by each. A coil spring 46 is housed in each cylindrical body 41 so as to apply elastic force in the vertical direction. In each of the cylindrical bodies 41,
Rods 48 having pressure sensors 47 attached to their upper ends are inserted through the holes 43 of the disc 44, respectively. Each of the pressure sensors 47 is in contact with the lower end of each of the coil springs 46, and can detect the pressing force applied to the coil spring 46 by the rise of each rod 48. Disc-shaped guides 49 for smoothly moving the rods 48 up and down are attached to the rods 48 below the sensors 47, respectively. A ball screw 50 is screwed to the lower end of each rod 44.
Each of the ball screws 50 penetrates the lower plate 3a of the frame 3 and projects into a recess (not shown) of the table 2. Casing (the other casing is not shown) 51 having a threaded engagement plate (not shown) is provided in each of the recesses. The lower end protruding portion of the ball screw 50 is screwed into the engagement plate in each of the casings 51. The ball screw 50 is provided in each casing 51.
Worm shafts (not shown) that engage with the lower end projections of the respective shafts are inserted from the horizontal direction, and handles (the other handle is not shown) 52 are provided at one end of each worm shaft. Therefore, when the handle 52 is rotated, the ball screw 50 engaging with the worm shaft of the handle 52 is rotated, and the rod 48 screwed with the ball screw 50 is moved up (or down). ing. In this case, the rod 4
When 8 is lowered to a certain distance or more, the disc-shaped guide 49 attached to the rod 48 comes into contact with the inner surface of the disc 44 below the cylindrical body 41 to lower the cylindrical body 41 itself. Therefore, the second box 15 fixed to the upper end of the cylindrical body 41 is lowered along the rail 4 by the slider 13.

The two cylindrical bodies 41 and the two discs 4
4, the two coil springs 46, the two pressure sensors 47, the two rods 48, the two discoid guides 49, the two ball screws 50, the two casings 51, the two worm shafts (Fig. (Not shown) and the two handles 52 constitute a first pressure adjusting means 53 for adjusting the pressing force applied to the film passing between the first and second rolls 9 and 16.

A cylindrical body 56 having upper and lower flanges 54 and 55 is arranged on the upper wall of the third box 23. As shown in FIG. 3, each of the cylinders 56 has a plurality of screws 57 screwed from the lower flange 51 to the upper wall of the third box 23 to form the third box 23.
It is fixed to each. Discs 59 having a hole 58 in the center are arranged on the upper flanges 54 of the respective cylinders 56, and the discs 59 are screwed to the upper flanges 54 from the discs 59. Each is fixed by a screw 60. A coil spring 61 is housed in each of the cylindrical bodies 56 so as to apply an elastic force in the vertical direction, and the coil spring 61 is also housed.
The lower ends of the two are in contact with the upper wall of the third box 23, respectively. A rod 63 having a pressure sensor 62 attached to the lower end thereof is inserted into each of the cylinders 56 through a hole 58 of the disc 59. Each pressure sensor 62
Is abutted on the upper end of each coil spring 61, and the pressing force on the coil spring 61 due to the lowering of each rod 63 can be detected. A disk-shaped guide 64 for smoothly moving the rod 63 up and down is attached to the rod 63 portion above each sensor 62. Ball screws 65 are attached to the upper ends of the rods 63, respectively. Each of the ball screws 65 penetrates the upper plate 3c of the frame 3 and projects above the upper plate 3c. Each upper plate 3
On the upper surface of c, a casing (the other casing is not shown) containing a threaded engagement plate (not shown) 66
Are provided respectively. The upper end protruding portion of the ball screw 65 is screwed onto the engagement plate in each casing 66. Worm shafts (not shown) that engage with the upper end projections of the ball screws 65 are respectively inserted into the casings 66 from the horizontal direction, and a handle is provided at one end of each worm shaft (the other handle is a 67 are provided respectively. Therefore,
By rotating the handle 67, the handle 6
The ball screw 65 engaged with the worm shaft 7 rotates, and the rod 63 screwed with the ball screw 65 descends (or rises).
In this case, when the rod 63 is raised above a certain distance, the disc-shaped guide 64 attached to the rod 63 comes into contact with the inner surface of the disc 59 above the cylindrical body 56 to raise the cylindrical body 56 itself. Let Therefore, the third box 23 fixed to the lower end of the cylindrical body 56 is raised along the rail 4 by the slider 21.

The two cylinders 56 and the two discs 5
9, the two coil springs 61, the two pressure sensors 62, the two rods 63, the two discoid guides 64, the two ball screws 65, the two casings 66, the two worm shafts (Fig. (Not shown) and the two handles 67 constitute second pressure adjusting means 68 for adjusting the pressing force applied to the film passing between the first and third rolls 9 and 24.

A winding roll (not shown) of a long organic film is arranged in front of the perforating unit 29. The long organic film 69 of the winding roll is transferred to the unit 29 via, for example, two feed rolls 70.
Is supplied between the first and second rolls 9 and 16, and further passes through a feed roll 66 to the first and third rolls 9 and 2.
It is supplied between four. The static electricity removing means 71 is arranged at the subsequent stage of the unit 29. The static electricity removing means 71
Is provided on the table 2 and is composed of a container 72 containing pure water and an ultrasonic wave generating member (not shown) for applying ultrasonic waves to the pure water. The long organic film 69 that has passed between the first and third rolls 9 and 24 is conveyed between the unit 29 and the static electricity removing means 71, inside the container 72, and at a subsequent stage of the container 72. Five feed rolls 70 are provided for each. In addition, the two
A patch roll 73 is arranged on each of the feed rolls 70. A plurality of hot air blowing members (not shown) and a winding roll (not shown) for drying the film 69 that has passed between the feed roll 70 and the contact roll 73 are provided downstream of the static electricity removing means 71. Are arranged in sequence.

Next, for example, biaxially oriented polypropylene (OPP) is manufactured by the porous film manufacturing apparatus having the above-described structure.
The operation of passing a long organic film 69 made of (1) between the first and second rolls 9 and 16 and between the first and third rolls 9 and 24 to form a large number of through holes will be described.

First, the first and second pressure adjusting means 53, 6
The second roll 16 and the third roll 24 are separated from the first roll 9 whose downward movement is restricted by a stopper (not shown) by operating the handles 52, 67, etc. A long organic film 69 made of OPP from a rotating roll (not shown) is fed by two feed rolls 70 between the first and second rolls 9 and 16 of the punching unit 29, the feed roll 66 and the first roll. Third
After passing between the rolls 9 and 24, the five rolls 70 pass the inside of the container 72 of the static electricity removing means 71, and further a plurality of hot air jet members (not shown) to wind the rolls. The long organic film 6 (not shown)
Wind the tip of 9.

After the end of the long organic film 69 is wound on a winding roll, the first pressure adjusting means 53-2 is used.
By rotating the two handles 52 in the clockwise direction, each second box 1 connected to the upper end of each cylindrical body 41
5 is moved up along each rail 4 of each frame 3 by a slider 13, and a second roll 16 having a shaft 19 pivotally supported by a bearing 14 in each second box 15 is provided.
On the first roll 9 on the long organic film 6
9 is sandwiched and brought into contact. Further, by rotating the respective handles 52 in the same direction, the respective sensors 47 at the upper ends of the rods 48 compress the respective coil springs 46 thereon. The compression of each of the coil springs 46 applies a pressing force to the lower wall of each of the second boxes 15, and the second roll 16 having the shaft 19 pivotally supported by the bearing 14 in each of the second boxes 15. The pressing force between the first roll 9 and the first roll 9 increases. At this time, the pressure sensor 47 detects the pressing force (compressive force) between the second and first rolls 16 and adjusts the rotation of each of the handles 51 in the forward and reverse directions. 2, the pressing force on the long organic film 69 located between the first rolls 16 and 9 is adjusted.

Then, by rotating the two handles 67 of the second pressure adjusting means 68 in the counterclockwise direction, the respective third boxes 2 connected to the lower ends of the respective cylinders 56 are connected.
3 is moved down along each rail 4 of each frame 3 by the slider 21, and the third roll 24 having the shaft 27 pivotally supported by the bearing 22 in each of the third boxes 23.
The long organic film 6 on the first roll 9 thereunder.
9 is sandwiched and brought into contact. Further, by rotating the handles 67 in the same direction, the sensors 62 at the lower ends of the rods 63 compress the coil springs 61 therebelow. By the compression of the coil springs 61, a pressing force is applied to the upper wall of each of the third boxes 24, and the third roll 24 having the shaft 27 pivotally supported by the bearing 22 in each of the third boxes 23. The pressing force between the first roll 9 and the first roll 9 increases. At this time, the pressure sensor 62 detects the pressing force (compressive force) between the third and first rolls 24, 9 and adjusts the rotation of each handle 67 in the forward and reverse directions. The pressing force applied to the long organic film 69 located between the third and first rolls 24 and 9 is adjusted.

The width of the long organic film 69 located between the second and first rolls 16 and 9 is adjusted by the pressure adjustment of the punching unit 29 by the first pressure adjusting means 63 as described above. A uniform pressing force is applied over the entire direction. Further, by adjusting the pressing force on the perforating unit 29 by the second pressure adjusting means 68, over the entire width direction of the long organic film 69 located between the third and first rolls 24, 9. A uniform pressing force is applied. Further, the first and second pressure adjusting means 53, 68
By pressing the second and third rolls 16 and 24 with the slider 5 and a stopper (not shown) against the first roll 9 which moves up and down within a desired distance range, the first roll 9 The occurrence of bending in the length direction of the is prevented. Such first and second pressure adjusting means 53,
Manipulation of 68 completes the preparation for drilling.

After the preparation for the punching operation is completed, ultrasonic waves are applied to the pure water contained in the container 72 of the static electricity removing means 71 by an ultrasonic wave generating member (not shown). Next, by rotating the winding roll and the drive shaft of a motor (not shown) at the same time, the shafts 19 and 2 of the second and third rolls 16 and 24 meshing with the gears of the drive shaft are rotated.
The gears 20, 28 of 7 are rotated clockwise. When the second and third rolls 16 and 24 rotate, they are located between the rolls 16 and 24 and the roll 1
The first roll 9 pressed by 6, 24 is rotated counterclockwise. At the same time, an AC voltage is supplied from the AC power supply 38 to the high voltage transformer 36 through the cable 37, and voltage control is performed there. For example, a high voltage of 3000V, 0.26A is applied to the front of each of the first boxes 7 through the cables 36a and 36b. Supplying to each collar 33 of each supply terminal 34 which is insulated and attached by each insulation cylinder 32, the supply terminal 3
4. The high voltage is supplied to the first roll 9 via the bearings 12 built in the first boxes 7. By rotating the first to third rolls 9, 16 and 24 and applying a high voltage to the first roll 9 in this manner, a space between the first and second rolls 9 and 16 and the first roll 9 A large number of concave portions are perforated in the long organic film 69 made of the OPP that passes between the first and third rolls 9 and 24, and the inner surfaces thereof are subjected to the affinity treatment.

That is, as shown in FIGS. 2 and 4, a large number of synthetic diamond particles 10 having sharp corners are attached to the surface of the first roll 9 at an area ratio of, for example, 70% or more via the electrodeposition layer 11a. And the second and third rolls 16 and 24 have iron roll bodies 18 and 26, respectively, whose surfaces are coated with dielectric layers 17 and 25, respectively. It has a built-in structure. Therefore, when the long organic film 69 passes between the first and second rolls 9 and 16, for example,
As shown in FIG. 6, the sharp corners of the large number of synthetic diamond particles 10 on the surface of the first roll 9 bite into the long organic film 69 uniformly to form mechanical perforations, thereby forming a large number of inverted conical shapes. The recess 74 is formed. At the same time, the first roll 9 supplied with the AC high voltage is opposed to the second roll 16 having the surface covered with the dielectric layer 17 with the long organic film 69 interposed therebetween. A large number of synthetic diamond particles 1 which are dielectrics on the surface of the roll 9
Corona discharge is uniformly generated between 0 and the dielectric layer 17 of the second roll 16. As a result, as shown in FIG. 6, since the corona is uniformly irradiated to the long organic film 69 in which the corners of the large number of synthetic diamond particles 10 of the first roll 9 are bitten, The inner surface of a large number of recesses 74 perforated in the shaku organic film 69 is subjected to an affinity treatment by the corona discharge. Further, when the long organic film 69 passes between the first and third rolls 9 and 24, the same perforation and corona discharge treatment are performed.
A large number of recesses are formed in the long organic film 69, and the inner surface of the recesses is affinity-treated. As a result, as shown in FIG. 7, a large number of recesses 74 having a fine opening width, the inner surface of which has affinity, are formed in the long organic film 69, and the remaining thin film portion is formed at a location corresponding to the bottom of each recess 74. 75
A long porous organic film 76 having a structure in which is present is obtained.

Also, the first and second pressure adjusting means 5
Even if the first roll 9 having a surface accuracy of several tens of μm is incorporated by adjusting the pressing force applied to the perforating unit 29 by 3, 68, between the first and second rolls 9 and 16 and between the first and third rolls. Since a uniform pressing force is applied over the entire width direction of the long organic film 69 passing between the rolls 9 and 24, the first and the second accompanying the passage of the long organic film 69. Dynamic external force such as vibration and impact between the rolls 9 and 16 and between the first and third rolls 9 and 24 is absorbed,
It is relaxed, and the first to third rolls 9, 16 and 24 are smoothly and continuously rotated. As a result, the mechanical perforation and corona discharge in the long organic film 69 by the first roll 9 are uniformly and uniformly performed in the entire width direction.

Further, the first and second pressure adjusting means 5
3, 68 can move the second and third rolls 16 and 24 up and down, that is, by pressing the first roll 9 arranged in a free state, the first roll 9 can be moved in the longitudinal direction. Since the occurrence of bending is prevented, mechanically uniform perforation and corona discharge due to sharp corners of the large number of synthetic diamond particles 10 attached to the surface of the first roll 9 are maintained even during long-term operation. .

The long organic film 69 perforated by the perforation unit 29 passes through and is conveyed in the container 72 of the static eliminating means 71 by the five feed rolls 70 and the two contact rolls 73. . Since the perforation of the long organic film 69 by the unit 29 is performed by friction between the first and second rolls 9 and 16 and between the first and third rolls 9 and 24 and corona discharge, A large amount of static electricity is generated on the surface of the film 69 after the perforation treatment, and dust around the film is attached. By passing the long organic film 69 after the perforation treatment through the container 72 containing the pure water of the static electricity removing means 71, and applying ultrasonic waves to the pure water by an ultrasonic wave generating member (not shown). The dust attached to the long organic film 69 is easily washed away. The long organic film 69 having a large number of through holes in which dust is washed away is
Water on the surface is volatilized and removed by passing through a plurality of hot air blowing members (not shown), and further wound on a winding roll.

Therefore, according to the above-described porous film manufacturing apparatus, mechanical uniform perforation and corona discharge due to sharp corners of a large number of synthetic diamond particles 10 attached to the surface of the first roll 9 are generated from OPP, for example. Since the long organic film 69 is formed of the long organic film 69, the long organic film 69 has a characteristic (for example, transparency,
Sub μm-300 with almost no loss of softness)
It has a fine opening width arbitrarily selected in the range of μm and has a large number of recesses (eg, 1 cm ^{2) in the} shape of an inverted cone whose inner surface shows affinity. (Each 500 to 200,000)
Can be formed in, excellent wettability, water, does not permeate bacteria, oxygen gas, carbon dioxide gas permeation amount, because it has controllability of water vapor transmission rate, base film for coating film formation, laminating film, It is possible to obtain a porous film suitable for various materials such as packaging material for keeping freshness of fruits and vegetables, packaging material for deoxidizing material, stretchable base film of effervescent agent, medical materials such as surgical gloves.

If the long organic film 69 is passed through both the first and second rolls 9 and 16 and between the first and third rolls 9 and 24, the first roll 9 is formed.
The long organic film 69 is subjected to mechanical uniform perforation and corona discharge treatment by sharp corners of a large number of synthetic diamond particles 10 attached to the surface twice, so that the inner surface has affinity. It is possible to form a larger number (high density) of the concave portions shown.

Furthermore, by fitting an insulating ring 8 made of, for example, a polycarbonate resin, into the bearing 6 contained in the first box 7, the first roll 9 to which a high voltage is supplied is transferred to the first box. Good insulation can be achieved for 7.

Further, the first and second pressure adjusting means 5
First and second description of the perforating unit 29 according to 3, 68
Between the rolls 9 and 16 and the first and third rolls 9 and 24
Since the pressure between the rolls is adjusted, the first to third rolls 9, 16 and 24 can be rotated smoothly and at a high speed, and the long organic film 69 is not wrinkled, and the perforating treatment described above is performed. The ability can be greatly improved.

Further, even if there is a variation in thickness of the long organic film, the long organic film 69 is broken in the process of passing between the rolls by the same action as described above. Therefore, it is possible to continuously form a large number of recesses in which the inner surface has affinity for the long organic film 69.

Further, by passing the long organic film 69 after the perforation treatment through the static electricity removing means 71,
A long porous film that is free from dust and the like and can be easily handled can be wound up on a winding roll.

On the other hand, in the above embodiment, an AC voltage is supplied from the AC power source 38 in the high voltage supply mechanism to the cable 37.
Through the cables 36a, 36b to supply high voltage transformer 36 through the cables 36a, 36b for voltage control.
Is supplied to each collar portion 33 of each supply terminal 34 which is insulated and attached to the front surface of each of the supply terminals 34 via each supply terminal 34 and each bearing 12 built in each first box 7. When a high voltage is applied to the first roll 9, as shown in FIG. 8, due to the concentration of the electric field at the sharp corners of the large number of synthetic diamond particles 10 that are dielectrics attached to the first roll 9, that is, the edge effect. The high energy corona 77 is mainly focused and irradiated on the residual thin film portion 75 located at the bottom of the concave portion 74 of the long organic film 69 formed by the biting of the corner portion of the synthetic diamond particle 10 to form a hole. Therefore, the recess 74 is formed in the remaining thin film portion 75.
A cylindrical through-hole having a diameter smaller than the opening width of is formed. Further, the inner surfaces of the large number of recesses 74 perforated in the long organic film 69 and the inner surfaces of the through holes are subjected to an affinity treatment by the corona discharge. As a result, as shown in FIG. 9, a large number of recesses 74 having a fine opening width whose inner surface has affinity are formed in the long organic film 69, and the residual thin film portion 75 located at the bottom of each recess 74 is formed. An elongated porous organic film 79 is obtained in which the inner surface exhibits affinity, and cylindrical through holes 78 having a diameter smaller than the opening width of the recess 74 are perforated.

Such a porous organic film has excellent wettability, suppresses or prevents permeation of water, bacteria, and miscellaneous bacteria, and permeates gas such as oxygen gas and carbon dioxide and water vapor to permeate gas. Amount, water vapor transmission rate controllability (especially high water vapor transmission rate) and the like. Therefore, the porous organic film is a coating film-forming base film described above, a film for lamination or a packaging material for maintaining freshness of fruits and vegetables, various packaging materials such as a packaging material for oxygen scavenger, a stretchable base film of an emulsifying agent, It can be effectively used for surgical gloves, gas selective permeation filters, etc.

In the manufacturing apparatus of the above-mentioned embodiment, the pressure adjusting means is the cylindrical body, the disc, the coil spring, the pressure sensor, the rod, the disc guide,
Although the ball screw, the casing, the worm shaft, and the handle are used, the present invention is not limited to this. For example, the pressure adjusting means may be formed by an air cylinder. Further, the 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 punching operation.

In the above example, the long organic film was passed through both the first and second rolls and between the first and third rolls, and the perforating operation was performed twice.
The long organic film may be passed through only one of the rolls. In the above embodiment,
Although the punching unit includes the first to third rolls, the punching unit may include the first and second rolls.

In the above-mentioned examples, an example in which a large number of through holes are formed in a long organic film made of OPP has been described, but other polyolefin films such as unstretched polypropylene and polyethylene, polyester films, elastomer films and the like. Various polymeric material films, other foamed polymeric material films, composite films,
Even when applied to a laminated film or the like in which a polymer material film is laminated in two layers or three layers, as in the example, the original characteristics of those film materials are hardly impaired, and the sub μm
To 300 μm, a recess having a fine opening width arbitrarily selected and having an affinity for the inner surface, or a recess having a similar opening width for the inner surface and a residual thin film at the bottom of the recess. It is possible to form a large number of through-holes having a diameter smaller than the opening width, the inner surface of which has an affinity for each other.

[0100]

As described above in detail, according to the present invention, various long organic films such as polymer materials and laminates can be used for the original characteristics of the film material (eg, transparency, softness, Strength, etc.) with almost no loss of sub-μm to 30
Has a fine opening width arbitrarily selected in the range of 0 μm,
The inner surface is uniform and has a large number of recesses (for example, 1 cm).
² Or 500 to 200,000 per minute), or fine recesses each having an affinity for the inner surface and through holes having a diameter smaller than the opening width of the recesses connected to the bottom of the recesses are uniform and numerous (for example, 1 cm ^2). 500 to 200,0 per
It is possible to mass-produce a porous film suitable for use as a base film for coating film formation, various gas filters, medical materials, functional films such as packaging materials for keeping fruits and vegetables freshness, etc. It is possible to provide various manufacturing equipment.

[Brief description of drawings]

FIG. 1 is a front view showing an apparatus for manufacturing a porous film in an example of the present invention.

FIG. 2 is a side view showing a main part of the manufacturing apparatus in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

4 is an enlarged cross-sectional view of a main part of a first roll in the manufacturing apparatus of FIG.

5 is a schematic diagram for explaining a high voltage supply mechanism that supplies a high voltage to the first roll in the manufacturing apparatus of FIG.

FIG. 6 is an enlarged cross-sectional view of a main part for explaining perforation and corona discharge treatment on a long organic film by the manufacturing apparatus of FIG.

FIG. 7 is an enlarged cross-sectional view of a main part of a long porous organic film obtained by perforation and corona discharge treatment shown in FIG.

8 is an enlarged cross-sectional view of an essential part for explaining another perforation and corona discharge treatment on a long organic film by the manufacturing apparatus of FIG.

9 is an enlarged cross-sectional view of a main part of a long porous organic film obtained by perforation and corona discharge treatment shown in FIG.

[Explanation of symbols]

1 ... Bed, 2 ... Table, 3 ... Frame, 7 ... 1st box, 8 ... Insulating ring, 9 ... 1st roll, 10 ... Synthetic diamond particle, 15 ... 2nd box, 16 ... 2nd roll, 17, 25 ... Alumina layer, 23 ... Third box, 2
4 ... 3rd roll, 29 ... Punching unit, 32 ... Insulating cylinder, 34 ... High voltage supply terminal, 36 ... High voltage transformer, 38
... AC power supply, 41, 56 ... Cylindrical body, 46, 61 ... Coil spring, 50, 65 ... Ball screw, 52, 67 ... Handle, 53, 68 ... Pressure adjusting means, 69 ... Long organic film, 71 ... Electrostatic Removal means 74 ... Recessed portion, 75 ... Remaining thin film portion, 76, 79 ... Long porous organic film, 78 ... Through hole.

Claims (13)

[Claims] 1. A supply means for supplying a long organic film; a rotatable first roll having a large number of dielectric particles having a Mohs hardness of 5 or more and having sharp corners attached to the surface thereof.
A second roll having a surface rotatable in a direction opposite to the first roll coated with a dielectric layer, and the first and second rolls.
The perforated organic film is passed between the rolls, and one or both of the rolls are movably arranged in their arrangement direction; A pressure adjusting means provided near both ends of one of the rolls for adjusting the pressing force of the rolls on the long organic film; a high voltage for supplying a high voltage to the first roll. An apparatus for producing a porous film, comprising: a supply unit. 2. The apparatus for producing a porous film according to claim 1, wherein the dielectric particles are synthetic diamond particles. 3. The porous body according to claim 1, wherein the second roll is formed of a metal roll body and a ceramic dielectric layer coated on the surface of the roll body. Film manufacturing equipment. 4. The punching unit further includes a third roll, which is rotatable about the first roll and opposite to the second roll in a direction opposite to the first roll. The manufacturing apparatus of the porous film according to claim 1, which is characterized in that. 5. The porous material according to claim 4, wherein the third roll is composed of a metal roll body and a ceramic dielectric layer coated on the surface of the roll body. Film manufacturing equipment. 6. The rolls of the punching unit,
6. The porous structure according to claim 1, wherein the shaft is rotated by shafts inserted through the centers of the shafts, and both ends of the shafts are axially supported by bearings built in the box. Quality film manufacturing equipment. 7. The pressure adjusting means is arranged in the box of the second roll, and comprises a compression member for pressing the first roll toward the first roll. Porous film manufacturing equipment. 8. A further pressure adjusting means is arranged in the box of the third roll, and further comprises a compression member for pressing the first roll toward the first roll. The porous film manufacturing apparatus described. 9. The apparatus for producing a porous film according to claim 1, wherein the high voltage supply means includes a control member for controlling a high voltage supplied to the first roll. 10. The high voltage supply means is coated on the outer periphery of the bearing that axially supports the shaft of the first roll, and an insulating material layer for electrically insulating the box.
An insulating cylinder inserted from the surface of the box through the box and the insulating material layer; a high-voltage supply terminal inserted so that the tip of the insulating cylinder contacts the bearing; The high-voltage supply source connected to the supply terminal is provided, The manufacturing apparatus of the porous film of Claim 1 characterized by the above-mentioned. 11. The high voltage supply means is further provided with a control member for controlling a high voltage supplied to the first roll in a connection path between the high voltage supply terminal and the high voltage supply source. The porous film manufacturing apparatus according to claim 10. 12. The porous film manufacturing apparatus according to claim 1, wherein a plurality of the perforating units provided with the pressure adjusting means are arranged in a transport direction of the film. 13. The apparatus for producing a porous film according to claim 1, further comprising electrostatic removing means provided at a stage subsequent to the perforating unit.