Film transport method, film transport device, and film vibration damping method

Abstract

To provide a film transport method, a film transport device, and a film vibration damping method that can easily reduce film vibration. [Solution] The method includes transporting a non-magnetic and conductive film to a vibration-damping section where magnets are placed and a magnetic flux of a static magnetic field exists, through which magnetic field lines originating from the magnets penetrate in the thickness direction of the film, and the process includes reducing the amplitude of the film by a magnetic field generated by eddy currents that occur in the film based on the temporal change of the magnetic flux penetrating the film, which vibrates at a dominant frequency of 1 Hz or higher, within the vibration-damping section.

Description

Technical Field

[0001] The present disclosure relates to a film conveyance method, a film conveyance apparatus, and a vibration damping method for a film.

Background Art

[0002] For films such as metal foils, printing, film formation, etc. may be performed for various purposes. In that case, the film may be continuously conveyed in a stretched state. Since the film is thin, vibration may occur during conveyance. The vibration may affect the quality of the film, the coating film, etc.

[0003] As an apparatus for suppressing vibration non-contact, an apparatus is known that reduces the vibration of a strip steel plate running along a predetermined running surface by operating the magnetic flux generated by magnets arranged on both sides of the steel plate (Patent Document 1). Also, a conveyance apparatus for a non-magnetic material that generates a force to move away the non-magnetic material by an alternating current electromagnet when conveying a non-magnetic material having conductivity is known (Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] When controlling the vibration of the conveyed material by using an alternating current electromagnet or the like, the apparatus may become complicated and difficult to control.

[0006] This disclosure has been made in view of the above circumstances. One embodiment of this disclosure aims to solve the problem of a film transport method, a film transport device, and a film vibration damping method that can easily reduce film vibration. [Means for solving the problem]

[0007] The following embodiments are included as specific means to solve the above problems.

[0008] <1> A film transport method comprising the steps of transporting a non-magnetic and conductive film to a vibration-damping section where magnets are placed and a magnetic flux of a static magnetic field exists through which magnetic field lines originating from the magnets penetrate in the thickness direction of the film, wherein the step includes reducing the amplitude of the film by a magnetic field generated by eddy currents that occur in the film based on the temporal change of the magnetic flux penetrating the film, which vibrates at a dominant frequency of 1 Hz or higher, within the vibration-damping section. <2> The magnet is a permanent magnet. <1> The film transport method described above. <3> A permanent magnet is a neodymium magnet. <2> The film transport method described above. <4> The distance between the film and the magnet is 50 mm or less in the vibration damping section. <1> ~ <3> A film transport method described in any one of the following. <5> The film has a thickness of 100 μm or less. <1> ~ <4> A film transport method described in any one of the following. <6> The vibration damping section is blown with a wind speed of 1 m / s or more along the direction of film transport or the opposite direction of transport. <1> ~ <5> A film transport method described in any one of the following. <7> The process includes transporting the film to a vibration-damping section equipped with a flow control plate that restricts the airflow path along the film, the flow control plate being installed along the direction of film transport, and the shape of the flow control plate such that the airflow path in the vibration-damping section widens as it moves downstream in the direction of airflow. <1> ~ <5> A film transport method described in any one of the following. <8> The flow path regulating plate has a shape in which the distance from the film increases as you move downstream in the direction of airflow. <7> The method for transporting the film described above. <9> The film is a long film, and the process includes transporting the film unwound from the winding roll to a vibration damping section and then winding it into a roll. <1> ~ <8> A film transport method described in any one of the following. <10> A film transport device for transporting a non-magnetic and conductive film, comprising: a transport means for transporting the film; and a vibration damping means installed in a vibration damping section provided in at least a part of the transport path, which has the function of reducing the amplitude of vibration of the film, wherein the vibration damping means has a magnet that generates a static magnetic field, and is configured such that when the vibrating film is transported in the vibration damping section, the magnetic field lines generated by the magnet penetrate the film in the thickness direction. <11> The magnet is a permanent magnet. <10> The film transport device described above. <12> A permanent magnet is a neodymium magnet. <11> The film transport device described above. <13> The distance between the film and the magnet is 50 mm or less in the vibration damping section. <10> or <11> The film transport device described above. <14> Transporting films with a thickness of 100 μm or less. <10> ~ <13> A film transport device as described in any one of the following. <15> The system includes a blowing mechanism that blows air at a wind speed of 1 m / s or more in the direction of film transport or in the opposite direction of transport within the vibration damping section. <10> ~ <14> A film transport device as described in any one of the following. <16> The vibration damping means includes a flow path restricting plate that restricts the airflow path along the film caused by the airflow, and the flow path restricting plate is provided extending along the film transport direction and has a shape in which the flow path in the vibration damping section widens towards the downstream direction of the airflow. <15> The film transport device described above. <17> The flow path regulating plate has a shape in which the distance from the film increases as you move downstream in the direction of airflow. <16> The film transport device described above. <18> A method for damping vibrations of a non-magnetic and conductive film by applying a static magnetic field through which magnetic field lines penetrate in the thickness direction of the film. [Effects of the Invention]

[0009] According to an embodiment of the present disclosure, it is possible to provide a film conveyance method, a film conveyance device, and a film vibration damping method that can easily reduce the vibration of a film.

Brief Description of Drawings

[0010] [Figure 1a] FIG. 1a is an explanatory diagram for explaining the vibration damping of a film. [Figure 1b] FIG. 1b is an explanatory diagram for explaining the vibration damping of a film. [Figure 2] FIG. 2 is an explanatory diagram for explaining a vibration damping section. [Figure 3] FIG. 3 is an explanatory diagram for explaining a film conveyance method having a blowing means. [Figure 4] FIG. 4 is an explanatory diagram for explaining a flow path regulating plate. [Figure 5] FIG. 5 is an explanatory diagram for explaining a film conveyance device. [Figure 6] FIG. 6 is an explanatory diagram for explaining the film conveyance device used in the embodiment.

Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present disclosure will be described in detail. The present disclosure is not limited to the following embodiments. The following embodiments may be appropriately changed within the scope of the object of the present disclosure.

[0012] When describing the embodiments of the present disclosure with reference to the drawings, descriptions of overlapping components and reference numerals in the drawings may be omitted. Components denoted by the same reference numerals in the drawings mean the same components. The ratio of dimensions in the drawings does not necessarily represent the ratio of actual dimensions.

[0013] In the present disclosure, a numerical range indicated using "~" indicates a range that includes the numerical values described before and after "~" as the lower limit value and the upper limit value, respectively. In the numerical ranges described stepwise in the present disclosure, the upper limit value or the lower limit value described in a certain numerical range may be replaced with the upper limit value or the lower limit value of the numerical range described in other stepwise descriptions. Further, in the numerical ranges described in the present disclosure, the upper limit value or the lower limit value described in a certain numerical range may be replaced with the value shown in the examples.

[0014] In the present disclosure, the amount of each component in the composition means the total amount of the plurality of substances present in the composition when there are a plurality of substances corresponding to each component in the composition, unless otherwise specified.

[0015] In the present disclosure, the term "step" includes not only an independent step but also cases where it cannot be clearly distinguished from other steps, as long as the intended purpose of the step is achieved.

[0016] In the present disclosure, "mass%" and "weight%" are synonymous, and "part by mass" and "part by weight" are synonymous.

[0017] In the present disclosure, a combination of two or more preferred embodiments is a more preferred embodiment.

[0018] In the present disclosure, ordinal numbers (e.g., "first" and "second") are terms used to distinguish components and do not limit the number of components or their superiority or inferiority.

[0019] In the present disclosure, "solid content" means components other than the solvent. <明細書において、「固形分」とは、溶剤以外の成分を意味する。 In each drawing, for the sake of avoiding complexity, only one of a plurality of equivalent components and parts may be labeled with a reference numeral.

[0020] <Film conveying method> Referring to FIGS. 1, FIG. 2, FIG. 3 and FIG. 4, a film conveying method according to an embodiment of the present disclosure will be described.

[0021] A film transport method in one embodiment of the present disclosure (hereinafter also referred to as the film transport method) includes the step of transporting a non-magnetic and conductive film to a vibration-damping section where magnets are arranged and a magnetic flux of a static magnetic field exists, through which magnetic field lines originating from the magnets penetrate in the thickness direction of the film. The step of transporting the film to the vibration-damping section includes reducing the amplitude of the film by a magnetic field generated by eddy currents that occur in the film based on the temporal change of the magnetic flux penetrating the film, which vibrates at a dominant frequency of 1 Hz or higher, within the vibration-damping section.

[0022] Let me explain the process that led to this embodiment of the present invention. Because the film is thin, vibrations caused by the film flapping during transport are often a problem. These vibrations are primarily reduced by adjusting the airflow and installing baffles. However, these methods involve a trade-off between drying and the risk of contact with the film, highlighting the need for new vibration damping techniques. Furthermore, conventional vibration damping methods using electromagnets and metal plates require the use of alternating current and PID (Proportional-Integral-Differential Controller) control of electromagnetic forces, making them expensive, complex, and difficult to control. Incorrect adjustments can even exacerbate vibrations.

[0023] The inventors diligently investigated simpler and easier-to-control methods for reducing vibration during film transport, and focused on applying a static magnetic field to a flapping, non-magnetic, and conductive film. They discovered that vibration damping is possible without contact by placing a magnet that generates a static magnetic field in a position where the static magnetic field can be applied to the flapping, non-magnetic, and conductive film. For example, it was found that vibrations could be suppressed by bringing a magnet close to a copper foil that was flapping in a space where air was flowing.

[0024] Although the mechanism by which the above effect is achieved is not clear, it is hypothesized that when the film flutters in response to the static magnetic field generated by the magnet, the magnetic flux passing through the film changes, and electromagnetic induction generates eddy currents that oppose this change in magnetic flux. The magnetic field generated by the resulting overcurrent creates a repulsive force on the film when it approaches the magnet and an attractive force when it moves away from the magnet, and as a result, the fluttering of the film can be suppressed without contact.

[0025] As shown in Figures 1a and 1b, a film transport method in one embodiment of the present disclosure (hereinafter also referred to as the film transport method) includes the step of transporting a non-magnetic and conductive film F to a vibration-damping section A where a magnetic flux of a static magnetic field exists that penetrates the film F in the thickness direction. The step of transporting the film F to the vibration-damping section A includes reducing the amplitude of the film by a magnetic field generated by eddy currents that occur in the film F based on the time change of the magnetic flux penetrating the vibrating film F in the vibration-damping section A. The magnet 11 generates a magnetic flux of a static magnetic field. The direction of the magnetic field lines 12 does not matter. In Figures 1a and 1b, the magnet 11 is positioned so that the right side of the paper is N, but the magnet 11 may also be positioned so that the left side of the paper is N.

[0026] As shown in Figure 1a, when the vibrating film F approaches the magnet 11, the movement of the film F causes an induced overcurrent to be generated in the film F, according to Faraday's law of electromagnetic induction, based on the time change in the magnetic flux passing through the film F. At this time, a change occurs in the magnetic field lines 12 that strengthens the magnetic field caused by the magnet 11 penetrating the film F. Therefore, the overcurrent, according to Lenz's law, attempts to weaken the magnetic field caused by the magnet 11 penetrating the film F, generating a magnetic field with magnetic field lines 13 that repel the magnetic field of the magnet 11. Consequently, the film F approaching the magnet 11 is brought closer to the reference R represented by the dashed line by the magnetic field with magnetic field lines 13, and the amplitude of the transported film F is kept small. In the figure, the arrows of the magnetic field lines indicate the direction of the magnetic field lines from N to S.

[0027] As shown in Figure 1b, when the vibrating film F moves away from the magnet 11, the movement of the film F causes an induced overcurrent in the film F based on the time change in the magnetic flux passing through the film F. At this time, a change occurs in the magnetic field lines 12 that weakens the magnetic field passing through the film F. Therefore, the overcurrent, in accordance with Lenz's law, attempts to strengthen the magnetic field generated by the magnet 11 that produces the magnetic field lines passing through the film F, and generates a magnetic field having magnetic field lines 13 that exert an attractive force on the magnetic field of the magnet 11. Therefore, the film F, which has moved away from the magnet 11, is brought closer to the reference R represented by the dashed line by the magnetic field 13, and the amplitude of the transported film F is kept small.

[0028] In Figures 1a and 1b, even if the direction of the magnetic field lines 12 of the magnet 11 is reversed, the vibration of the film F is suppressed in the same manner as described above. Furthermore, the reference R can be defined as the hypothetical position in the vibration-damping section A where the film F does not vibrate. In the case where the film F does not vibrate, this can be, for example, the state where the film is stationary without being transported.

[0029] As described above, the vibration of the vibrating film F is reduced. The film transport method of this disclosure does not use electricity, power, etc., and does not require control of these. It is applicable in various environments as long as a static magnetic field exists that penetrates the thickness direction of the film F and the magnetic flux penetrating it changes due to the vibration of the film. Furthermore, it is easy to apply as it is sufficient to create a static magnetic field with magnetic flux penetrating the thickness direction of the film F. Therefore, according to the film transport method of this disclosure, the amplitude of the film being transported that deviates from the reference R can be reduced.

[0030] As a method for generating the magnetic flux of a static magnetic field, it is preferable to use a method that allows a magnetic flux of a static magnetic field to exist in the vibration damping section A, penetrating in the thickness direction of the film F. A static magnetic field means a magnetic field that does not change over time. Examples include using permanent magnets and DC electromagnets. As an example of using DC electromagnets, a method of passing a DC current through a coil such as a solenoid is used. The static magnetic field, depending on the type of film F, preferably has a magnetic flux density of 200 mT or more, and more preferably 400 mT or more. The upper limit of the magnetic flux density can be any magnetic flux density that is industrially feasible. For example, the upper limit of the magnetic flux density may be 1.4 T.

[0031] The static magnetic field is preferably generated by the magnet 11 installed in the vibration damping section A, and more preferably by a permanent magnet. This is because it is possible to generate a static magnetic field without using electric current or the like, and it is simple. As the permanent magnet, a neodymium magnet is preferable. This is because its magnetic flux density is within a desirable range and it has high coercivity. For example, when using copper foil as the film F, a neodymium magnet with a magnetic flux density of about 500 mT is preferably used.

[0032] The film F is spread out into a single sheet for deposition, processing, etc., and transported, for example, by roll-to-roll. The transport direction of the film F is not restricted. The film F may be moved substantially horizontally, substantially vertically, or at any angle from the horizontal or vertical direction.

[0033] Film F can be any thin film that is nonmagnetic and conductive. "Non-magnetic" means that when a film is placed in an external magnetic field, it does not exhibit any magnetic reaction with other materials due to attractive or repulsive forces. "Conductivity" refers to the property of being able to conduct electric current, and conductivity is 0.5 × 10⁻⁶. 6 This refers to the property of being S / m or greater.

[0034] Examples of film F include films used in electromagnetic shielding, transparent conductive films, and touchscreens. Specifically, these include metal foils, carbon fiber films, conductive polymer films, graphene films, and silver nanowire films. Examples of metal foils include copper foil, aluminum foil, titanium foil, stainless steel foil, and nickel foil. Even if the film substrate itself is not nonmagnetic and conductive, it may become a nonmagnetic and conductive film F through coating, vapor deposition, lamination, etc.

[0035] The film F can be of a thickness commonly referred to as a film or foil. From the viewpoint of vibration damping effect, the film F is preferably thin, more preferably 100 μm or less in thickness, and even more preferably 10 μm or less in thickness. This is presumed to be because the thinner the film F, the smaller the inertial force due to vibration and the higher the dominant frequency tends to be.

[0036] Other conditions for film F include the material and composition of film F; conventionally known conditions can be used for any film F that is being transported. For example, the web width of film F may be 300 mm if it is copper foil with a thickness of 5 μm to 100 μm.

[0037] As shown in Figure 2, vibration damping section A is provided in at least a portion of the transport path by the film transport device 10, which will be described later. The film transport method transports the film F in the direction of the arrow and transports the film F to vibration damping section A. The film F can be transported under conventionally known conditions. For example, if the film F is a copper foil with a thickness of 5 μm to 100 μm, it may be transported at a speed of 10 m / min and a tension of 20 N.

[0038] From the viewpoint of vibration damping effect, the distance D1 between the film F and the magnet 11 is preferably 50 mm or less, and more preferably 20 mm or less, in the vibration damping section. The lower limit is a distance at which the film F does not come into contact with the magnet 11 during transport. For example, this is 5.0 mm or more.

[0039] Film F often experiences some degree of vibration during transport. Vibration refers to a displacement of the film F in the thickness direction. For example, during transport, the film F is displaced in the thickness direction from a reference R. The reference R can be the hypothetical position of film F in the vibration-damping section A, assuming that it does not vibrate. If film F does not vibrate, for example, it can be considered as the film being stationary without being transported.

[0040] Vibration is not limited to periodic displacement of position. For example, when film F is transported substantially horizontally, the vibration of film F includes repeated displacement of film F's position upward and downward from a reference point. When film F is transported substantially vertically, the vibration of film F includes repeated displacement of film F's position to the right and left from a reference point.

[0041] The dominant frequency of film F immediately before entering vibration damping section A is 1.0 Hz or higher. A dominant frequency of 1.0 Hz or higher means that, when the time evolution of the displacement of film F is measured and the resulting spectrum is Fourier transformed, the frequency with the largest amplitude is 1.0 Hz or higher. From the viewpoint of vibration damping effect, the dominant frequency of film F is preferably 10 Hz or higher. The upper limit of the dominant frequency of film F may be 100 Hz.

[0042] In vibration damping section A, from the viewpoint of vibration damping effect, it is preferable that air is blown in the direction of film F's transport or in the opposite direction of transport at a wind speed of 1 m / s or more. Air blown in the direction of transport means that the direction of air blown is the same as the transport direction or a direction substantially parallel to the transport direction. The same applies when air is blown in the opposite direction of transport. Furthermore, "substantially parallel" includes directions that are not actually parallel within a margin of error, etc. As shown in Figure 3, the film transport device 10 may be equipped with a blowing means 15 that blows air at a velocity of 1 m / s or more in the transport direction of the film F in the vibration damping section A. The blowing means 15 generates wind W. The blowing may be for drying the film F by coating, film formation, etc. The wind velocity is more preferably 5 m / s or more, and even more preferably 10 m / s or more. When transporting the film F, blowing air at the above wind velocity may cause the vibration of the film F to become severe, which may affect, for example, the surface properties of the film F that has undergone film formation, coating, etc. According to the film transport method which is one embodiment of the present disclosure, vibration can be more preferably reduced at the above wind velocity.

[0043] The process of transporting the film F to the vibration-damping section A preferably includes transporting the film A to a vibration-damping section A equipped with a flow path restricting plate that restricts the airflow path along the film F by blowing air, from the viewpoint of maintaining the vibration-damping effect. The flow path restricting plate is preferably provided along the transport direction of the film F and has a shape in which the flow path in the vibration-damping section A widens as it moves downstream in the direction of airflow.

[0044] As shown in Figure 4, the film transport device 10 may be equipped with a flow path restricting plate 16 in the vibration damping section A. By installing the flow path restricting plate 16 and blowing air, a negative pressure is generated between the film F and the flow path restricting plate 16 due to the Bernoulli effect, causing the film F to be attracted to the flow path restricting plate, reducing its distance from the magnet and further reducing vibration.

[0045] The flow path restricting plate 16 should have a shape in which the airflow path widens as it moves downstream in the direction of airflow in the vibration damping section A, and preferably a shape that can produce the Bernoulli effect on the film F. Here, the flow path refers to the space through which the airflow from the air supply flows, and means the space sandwiched between the virtual reference transport surface of the film F and the flow path restricting plate. The reference transport surface refers to the ideal transport surface when it is assumed that the film F does not experience any vibration, deflection, or other positional changes due to external factors during transport of the film F. Furthermore, from the viewpoint of vibration damping effect, it is preferable to install the magnet on the side of the flow path restricting plate 16 opposite to the side facing the film F, such that the distance between the magnet and the flow path restricting plate 16 is small. The magnet 11 and the flow path restricting plate 16 may be in contact. This is to prevent the magnet 11 from weakening the strength of the static magnetic field acting on the film F.

[0046] The flow path restrictor plate 16 only needs to be able to form a flow path shape that widens towards the downstream direction of airflow. Therefore, the flow path restrictor plate 16 does not have to be plate-shaped, but can be box-shaped, as long as it can form a flow path shape that widens towards the downstream direction of airflow. For example, if the flow path restrictor plate 16 is box-shaped, it may be wing-shaped on the surface that forms the flow path, so that the flow path shape widens towards the downstream direction of airflow. In this case, the inside of the wing-shaped flow path restrictor plate 16 may be hollowed out and the magnet 11 may be incorporated inside.

[0047] From the viewpoint of vibration damping effect, it is preferable that the flow path restricting plate 16 has a shape in which the distance from the film F increases as it moves downstream in the airflow direction. Examples of flow path regulating plates include those formed using materials such as polyvinyl chloride and polyethylene. As shown in Figure 4, the distance between the flow path restrictor plate 16 and the film F is greater when the distance D3 is downstream in the airflow direction than when the distance D2 is upstream in the airflow direction. This allows the Bernoulli effect to be more effectively utilized, creating negative pressure on the film F, which attracts the film F to the flow path restrictor plate, bringing it closer to the magnet and thus controlling vibrations.

[0048] The film F is a long film, and the process of transporting the film F to the vibration-damping section A preferably includes transporting the film F unwound from the winding roll to the vibration-damping section A and then winding it into a roll. This is because vibrations are likely to occur when transporting a long film, and the effects of the film transport method, which is one embodiment of this disclosure, can be more easily demonstrated.

[0049] The process of transporting the film F to the vibration-damping section A is preferably included in the drying process. For example, in a drying process in which the film F is dried while being transported, such as during film formation or coating, air is blown over the film F. This can increase the vibration of the film F. Therefore, by including the vibration-damping section A in the drying process, the effects of the film transport method, which is one embodiment of this disclosure, can be more easily realized. Furthermore, the drying process may be carried out in a drying chamber, for example, that is partitioned off from the surrounding space, from the viewpoint of drying efficiency. With the film transport method, it is only necessary to place the magnet 11, the air blowing means 15, the flow path regulating plate 16, etc., in the drying chamber once, and the vibration of the film can be easily reduced.

[0050] In the process of transporting the film F to the vibration damping section A, it is preferable to reduce the amplitude of the film F by 30% or more in the vibration damping section A. More preferably, the amplitude of the film F is reduced by 90% or more in the vibration damping section A. Even more preferably, the amplitude of the film F is reduced by 99% or more in the vibration damping section A. The amplitude of film F in vibration damping section A refers to the amplitude in the vibration described above. Therefore, it represents the maximum distance that film F deviates to one side from its reference position.

[0051] The amplitude to be reduced may be controlled depending on the purpose of vibration damping, etc. The amplitude can be controlled as described above by the dominant frequency of the film F, the distance between the film F and the magnet 11, the thickness of the film F, the wind speed, the shape or presence of the flow path restricting plate 16, etc.

[0052] <Film transport device> One embodiment of the present disclosure, a film transport device (hereinafter also referred to as the film transport device), is a transport device for transporting non-magnetic and conductive films. The film transport device comprises a transport means and a vibration damping means. For example, as shown in Figure 5, the conveying means includes a plurality of rollers such as roller 14 and has the function of conveying the film F. The vibration damping means is installed in a vibration damping section A provided in at least a part of the conveying path and has the function of reducing the amplitude of the vibrating film F. The vibration damping means includes a magnet 11 which is a permanent magnet, and is configured so that when the vibrating film F is conveyed in the vibration damping section A, the magnetic field lines generated by the permanent magnet penetrate the film F in the thickness direction.

[0053] In the film transport device 10, the magnet is preferably a permanent magnet, and the permanent magnet is preferably a neodymium magnet. In the film transport device 10, the distance between the film F and the permanent magnet is preferably 50 mm or less in the vibration damping section A. The film transport device 10 preferably transports films F having a thickness of 5 μm to 100 μm. The film transport device 10 preferably includes a blowing means that blows air at a wind speed of 1 m / s or more in the direction of transport of the film A or in the opposite direction of transport within the vibration damping section A. In the film transport device 10, the vibration damping means includes a flow path restricting plate 16 that restricts the flow path of air that flows along the film F by blowing air, as shown in Figure 4. Preferably, the flow path restricting plate 16 is provided extending along the transport direction of the film F, and the flow path in the vibration damping section A has a shape that widens as it moves downstream in the direction of air blowing. In the film transport device 10, it is preferable that the flow path regulating plate 16 has a shape in which the distance from the film F increases as it moves downstream in the airflow direction. The film transport device 10 preferably has a configuration that includes a winding roll 17 for unwinding the film F and a winding roll 18 for winding the film F unwinding from the winding roll 17 into a roll shape, as shown in Figure 5. The film transport device 10 implements a film transport method which is one embodiment of the present disclosure. Therefore, preferred aspects and effects of the film transport device 10 are the same as those described in the film transport method above and are therefore omitted.

[0054] <Vibration damping methods for film> One embodiment of the present disclosure, a method for damping vibrations of a film (hereinafter also referred to as the film vibration damping method), comprises the step of applying a static magnetic field through which magnetic field lines penetrate in the thickness direction of the film to a vibrating nonmagnetic and conductive film. The film transport method described above is a method for transporting film F, but a vibration damping method is also effective for vibrating films that are not being transported, in which magnetic field lines penetrate the film in the thickness direction, and a static magnetic field is applied that changes over time due to the vibration of the film. Even when the film is not being transported, a vibration damping method is similarly effective for films F that vibrate due to airflow, in which a static magnetic field is applied that penetrates the film in the thickness direction. Therefore, the explanation, preferred embodiments, effects, etc. of the film transport method described above are the same except that the film is not being transported, and are therefore omitted. [Examples]

[0055] The present disclosure will be further explained with reference to the following examples. The materials, amounts used, proportions, processing content, and processing procedures shown in the following examples may be modified as appropriate, as long as they do not deviate from the spirit of this disclosure. Therefore, the scope of this disclosure is not limited to the following examples.

[0056] <Examples 1-8 and Comparative Example 1> A film transport device 10 having a vibration damping section A as shown in Figure 3 was prepared, and the vibration damping effect was evaluated. Copper foil was used as the film F, and the film F was conveyed using a roll-to-roll method, where it was unwound from a winding roll (not shown) and then wound into a roll (not shown). The vibration damping section A was approximately 1 m in length in the conveying direction. A magnet 11 was placed in the center of the vibration damping section A. Throughout the entire vibration damping section A, the magnet 11 created a static magnetic field flux that penetrated the film F in the thickness direction. Air was blown in the conveying direction of the film F to simulate drying, and the wind speed was measured in the conveying direction. Table 1 shows the basic conditions for film and transport. The tension ranged from 20N to 50N, and was varied depending on the specific example and comparative example. In Comparative Example 1, the magnet 11 was not installed. In Examples 1 to 8, the transport was carried out under the conditions shown in Table 2.

[0057] [Table 1]

[0058] <Examples 9 to 11> A film transport device 10 having a vibration damping section A as shown in Figure 4 was prepared and used to evaluate the vibration damping effect in the same manner as in Example 1. In Examples 9 to 11, transport was performed under the conditions shown in Table 2. The flow path restricting plate 16 was manufactured using polyvinyl chloride or polyethylene, and the shape of the flow path restricting plate 16 was such that the flow path formed by the restricting plate 16 widens towards the downstream direction of the airflow, the length of the flow path restricting plate 16 in the airflow direction was 100 mm, the distance D2 was 3 mm, and the distance D3 was 20 mm.

[0059] <Examples 12, 13, and 2> A film transport device 10 having a vibration-damping section A as shown in Figure 6 was prepared, and the vibration-damping effect was evaluated in the same manner as in Example 1, except that this device was used. Specifically, the film was transported without airflow to create a 1m span path. The rollers 14 and 19 before and after this path were mechanically forced to vibrate with an amplitude of 5mm to change their dominant vibration frequency. The film transport device 10 shown in Figure 6 includes rollers 14 and 19. Rollers 14 and 19 are configured to vibrate, and can vibrate above or below the film F at any dominant frequency. In Examples 12 and 13, the transport was carried out under the conditions shown in Table 3.

[0060] <Measurement and Evaluation> (Dominant frequency) In Examples 1 to 11 and Comparative Example 1, it was confirmed that the dominant frequency of film F was 1 Hz or higher. The method for measuring the dominant frequency was the same as the method described above.

[0061] (Vibration damping effect) In each of Examples 1 to 13 and Comparative Example 1, the amplitude of vibration in the film F was measured using a laser displacement meter, both with and without the magnet 11 installed. The amplitude was measured at the central position of the magnet 11. The percentage difference between the amplitude with and without the magnet 11 was calculated. In Comparative Example 1, vibrations with a dominant frequency of 5 Hz and an amplitude of 3 mm were continuously generated in film F.

[0062] The evaluation criteria were as follows. Criteria A through C were considered passing grades, and criterion D was considered a failing grade. The evaluation results are shown in Table 2. -Evaluation Criteria- A: The amplitude when magnet 11 is installed is 1% or less compared to the amplitude when magnet 11 is not installed. B: The amplitude when magnet 11 is installed is greater than 1% and less than or equal to 10% compared to the amplitude when magnet 11 is not installed. C: The amplitude when magnet 11 is installed is greater than 10% and less than or equal to 70% compared to the amplitude when magnet 11 is not installed. D: The amplitude when magnet 11 is installed is greater than 70% compared to the amplitude when magnet 11 is not installed.

[0063] [Table 2]

[0064] [Table 3]

[0065] As shown in Examples 1 to 3 of Table 2, when the film was transported in the presence of a fan and a neodymium magnet was placed in vibration damping section A, a narrower distance between the film and the magnet resulted in a higher vibration damping effect. As shown in Examples 4 to 8 of Table 2, when the film was transported in the same manner as in Example 3 with airflow and a neodymium magnet was placed in vibration damping section A, the vibration damping effect was weak when the film was too thin or too thick. It is thought that when the film is too thin, electromagnetic induction is less likely to occur, and when the film is too thick, the inertia of the film's vibration is large and the vibration is difficult to stop. As shown in Examples 3 and 9 to 11 of Table 2, when the film was transported with airflow, neodymium magnets were placed in vibration damping section A, and flow path restricting plates were installed, the vibration damping effect improved, and the vibration damping effect improved with higher wind speeds. As shown in Comparative Example 2, Example 12, and Example 13 in Table 3, in Comparative Example 2, no vibration damping effect was obtained because the film did not vibrate. As shown in Example 12 and Example 13, the vibration damping effect was higher when the dominant vibration frequency of film F was 10 Hz than when it was 1 Hz. As described above, it has been demonstrated that the vibration of a film can be easily reduced by the film vibration damping method, film vibration damping device, or film vibration damping method of this disclosure, as demonstrated in Examples 1 to 13. [Explanation of Symbols]

[0066] 10 Film transport device 11 Magnets 12, 13 Magnetic field lines 14, 19 Laura 15. Blower means 16 Flow control plate A Vibration-damping section D1, D2, D3 distance F Film R standard W Wind

Claims

1. The process includes transporting a non-magnetic and conductive film to a vibration-damping section where magnets are placed and a magnetic flux of a static magnetic field exists, through which magnetic field lines originating from the magnets penetrate in the thickness direction of the film. The above step is a film transport method that includes reducing the amplitude of the film by a magnetic field generated by eddy currents that occur in the film based on the temporal change of the magnetic flux passing through the film, which vibrates at a dominant frequency of 1 Hz or more, in the vibration-damping section.

2. The film transport method according to claim 1, wherein the magnet is a permanent magnet.

3. The film transport method according to claim 2, wherein the permanent magnet is a neodymium magnet.

4. The film transport method according to claim 1, wherein the distance between the film and the magnet is 50 mm or less in the vibration damping section.

5. The film transport method according to claim 1, wherein the film has a thickness of 100 μm or less.

6. The film transport method according to claim 1, wherein the vibration damping section is blown with a wind speed of 1 m / s or more along the transport direction of the film or in the opposite direction of the transport direction.

7. The above step includes transporting the film to the vibration-damping section, which is provided with a flow path restricting plate that restricts the flow path of air that flows along the film due to the blowing air, The flow path restricting plate is provided along the direction of film transport, The film transport method according to claim 6, wherein the shape of the flow path restricting plate is such that the flow path in the vibration damping section widens as it moves downstream in the direction of airflow.

8. The film transport method according to claim 7, wherein the flow path restricting plate has a shape such that the distance from the film increases as it flows downstream in the airflow direction.

9. The aforementioned film is a long film, The film transport method according to claim 1, further comprising the step of transporting the film unwound from the winding roll to the vibration damping section and then winding it into a roll shape.

10. A film transport device for transporting non-magnetic and conductive films, A conveying means for conveying the aforementioned film, The transport path includes a vibration damping means installed in a vibration damping section provided in at least a portion of the transport path, which has the function of reducing the amplitude of the vibrating film, The vibration damping means is a film transport device having a magnet that generates a static magnetic field, and is configured such that when the vibrating film is transported through the vibration damping section, the magnetic field lines generated by the magnet penetrate the film in the thickness direction.

11. The film transport device according to claim 10, wherein the magnet is a permanent magnet.

12. The film transport device according to claim 11, wherein the permanent magnet is a neodymium magnet.

13. The film transport device according to claim 10, wherein the distance between the film and the magnet is 50 mm or less in the vibration damping section.

14. The film transport device according to claim 11, which transports the film having a thickness of 100 μm or less.

15. The film transport device according to claim 10, further comprising a blowing means for blowing air at a wind speed of 1 m / s or more in the direction of transport of the film or in the opposite direction of transport in the vibration damping section.

16. The vibration damping means includes a flow path restricting plate that restricts the flow path of air that flows along the film due to the airflow, The film transport device according to claim 15, wherein the flow path restricting plate is provided extending along the transport direction of the film, and the flow path in the vibration damping section has a shape that widens as it moves downstream in the air blowing direction.

17. The film conveying device according to claim 16, wherein the flow path restricting plate has a shape such that the distance from the film increases as it flows downstream in the direction of airflow.

18. A method for damping vibrations of a non-magnetic and conductive film, comprising applying a static magnetic field through which magnetic field lines penetrate in the thickness direction of the film to the vibrating film.

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