JP2010179276A - Foreign matter remover of film surface, and method of manufacturing film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a remover for a foreign matter of a film surface, which can sufficiently remove dust from the film surface, and produces no scratch on the film surface at the side contacting with a suction roll, and a method of manufacturing a film. <P>SOLUTION: In the foreign matter remover of the film surface, a backup roll is the suction roll and a longitudinal elastic modulus of the surface contacting with the film of the suction roll is ≥1.0×10<SP>1</SP>MPa and ≤1.5×10<SP>5</SP>MPa. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a foreign matter removing apparatus for removing a foreign matter adhering to a sheet-like film base material and a film manufacturing method.

  Examples of the film in which the coating layer is formed on the sheet-like film substrate include a polarizing plate protective film and an optical compensation film of a liquid crystal display device. Such a film has a hard coat layer for protecting the surface and a layer for controlling the refractive index for controlling reflection of light on the surface of a film to be a base material such as a TAC film (cellulose triacetate film). Etc. are applied.

  In such a film manufacturing method, in order to form a uniform coating layer, after removing dust such as dust adhering to the coating surface side of the film surface serving as a substrate, the coating layer is formed on the film surface. It is formed. If the dust is not sufficiently removed, a so-called repellency failure occurs in which the coating film thickness becomes thin starting from dust on the coating film.

  In particular, a film such as a polarizing plate used in a liquid crystal display device is increasingly required to remove dust due to the recent demand for higher definition of display devices.

  As a device for removing dust from the surface of the base film, dust is attached to the film surface by blowing high-pressure air toward the base film that contacts the rotating backup roll with a predetermined holding angle. For example, a method is known in which dust containing air is removed and air containing dust is sucked by suction ports arranged upstream and downstream in the film conveying direction at a position where high-pressure air is blown (see Patent Document 1). ). Further, in order to thoroughly remove dust on the film surface, the air pressure is in a direction to be further increased.

  However, in the above dust removal method, if the air pressure is increased, it is necessary to increase the suction force for sucking the air containing dust, so that the film facing the suction port is attracted to the suction port side. As a result, there is a problem that the film surface comes into contact with members around the suction port or the suction port mounting portion and the film surface is damaged.

  For such a problem, there is a method in which a suction roll is used as a backup roll and the film is adsorbed on the suction roll side so that the film is not attracted to the suction port side even if the air suction force is increased. It has been proposed (see Patent Document 2).

JP-A-10-309553 JP 2008-272647 A

  However, in the apparatus of Patent Document 2, foreign matter on the film surface can be removed, but by blowing high-pressure air, the suction opening on the surface of the suction roll remains on the surface of the film in contact with the suction roll as a scratch. Occurred. In particular, when a laminated film as an optical film used in a liquid crystal display device is produced, there is a problem that if the surface opposite to the coated surface is scratched, the optical performance is lowered and the product is not manufactured.

  Accordingly, an object of the present invention is to provide a foreign matter removing apparatus and a film manufacturing method that can sufficiently remove dust on the film surface and that does not damage the film surface on the side in contact with the suction roll. It is to be.

  The problems of the present invention can be solved by the following means.

1. A backup roll that contacts and rotates with the film at a predetermined angle;
A cleaning head disposed at a predetermined distance from the film in contact with the backup roll;
The cleaning head is
An air outlet for ejecting air for peeling off and removing dust adhering to the surface of the film;
An air suction port for sucking air from the air ejection port containing dust,
In the apparatus for removing foreign matter from the film surface having
The backup roll is a suction roll having a suction part opened on the surface,
An apparatus for removing foreign matter on a film surface, wherein the suction roll has a surface having a longitudinal elastic modulus of 1.0 × 10 ¹ MPa to 1.5 × 10 ⁵ MPa in contact with the film.

  2. 2. The apparatus for removing foreign matter from a film surface according to 1 above, wherein an opening length of the suction portion on the surface of the suction roll is 10 μm or more and 5000 μm or less.

  3. 3. The apparatus for removing foreign matter from a film surface according to 1 or 2, wherein an air pressure ejected from the air ejection port is 500 kPa or more and 1000 kPa or less.

4). The cleaning head is
The longitudinal direction of the air outlet is a direction parallel to the axis of rotation of the suction roll;
As the air suction port,
A first air suction port whose longitudinal direction is arranged in parallel with the air jet port;
The first air suction port according to any one of 1 to 3, further comprising: a second air suction port facing the both end portions of the film and having a longitudinal direction arranged in parallel with a running direction of the film. A device for removing foreign matter from the film surface.

  5. 5. The foreign matter removing apparatus for film surface according to any one of 1 to 4, further comprising an adhesive roll that contacts the surface of the suction roll and removes dust adhering to the suction roll.

6). In the method for producing a film comprising a step of removing foreign matter on the surface of the film by blowing high-pressure air on the surface of the film to be conveyed,
The step of removing foreign matter on the surface of the film,
On the surface of the film in contact with the surface of the rotating suction roll having a longitudinal elastic modulus of 1.0 × 10 ¹ MPa to 1.5 × 10 ⁵ MPa with a predetermined holding angle,
High-pressure air is ejected from the air ejection port of a cleaning head having an air ejection port and an air suction port to the surface of the film to peel off and remove dust adhering to the surface of the film, and the film is placed in the air suction port. A method for producing a film, comprising sucking air containing dust separated and removed from the surface of the film.

  According to the present invention, in the foreign matter removing apparatus for removing dust on the film surface, the suction roll is used as a backup roll, and the longitudinal elastic modulus of the surface that comes into contact with the film of the suction roll is set within a predetermined range. Even if high-pressure air is blown onto the film, the shape mark of the suction part of the suction roll does not remain on the film, and the foreign matter removing apparatus and the film manufacturing method capable of sufficiently removing dust on the film surface can be provided.

It is a schematic sectional drawing which shows embodiment of the foreign material removal apparatus 10 of this invention. It is the top view which looked at the cleaning head of this embodiment from the backup roll side. It is a perspective view of the suction roll of this embodiment. It is an enlarged view of the suction part of the suction roll used for this embodiment. It is a top view which shows another embodiment of a cleaning head. It is sectional drawing of the foreign material removal apparatus 10 provided with the braid | blade which removes the dust adhering to the suction roll and the adhesion roll on the suction roll. It is a schematic diagram of the laminated film manufacturing apparatus for forming a coating film on a film.

  The present invention will be described below using embodiments, but the present invention is not limited to these embodiments.

  FIG. 1 is a schematic cross-sectional view showing an embodiment of a foreign matter removing apparatus 10 for film surface according to the present invention. The foreign matter removing apparatus 10 has a backup roll 1 and a cleaning head 3. The backup roll 1 is in contact with the film 2 with a predetermined holding angle θ. The cleaning head 3 faces the portion of the film 2 that is in contact with the backup roll 1 at the holding angle θ, and the shape of the facing surface is a shape that substantially conforms to the shape of the backup roll and is a predetermined distance d from the surface of the film 2. It is arranged only at a position apart. The cleaning head 3 has an air outlet 31 for ejecting high-pressure air for separating and removing dust attached to the surface of the film 2, and air for sucking high-pressure air containing dust removed and removed from the surface of the film 2. And a suction port 32. A pump for generating high-pressure air (not shown) is connected to the air outlet 31. The air suction port 32 is connected to a suction pump (not shown) that sucks air.

  FIG. 2 is a plan view of the cleaning head 3 as viewed from the backup roll 1 side. The air suction ports 32 of the cleaning head 3 are arranged one by one on the upstream side and the downstream side with respect to the film transport direction a in parallel with the air jet ports 31. The number of air suction ports 32 does not have to be two, and may be one or two or more as long as high-pressure air including the separated and removed dust can be efficiently sucked.

  FIG. 3 is a perspective view of the suction roll 1 used as the backup roll 1 of the present embodiment. The suction roll 1 has a large number of suction portions 11 which are holes provided on the surface thereof, and a decompression for reducing the pressure inside the suction roll 1 in order to adsorb the film 2 on the surface of the suction roll 1 at the shaft end portion. It has a mouth 12. Although not shown, a decompression pump is connected to the decompression port 12.

  FIG. 4 shows an enlarged view of the suction part 11 of the suction roll 1 used in the present embodiment. 4A is a plan view of the suction part 11, FIG. 4B is a sectional view thereof, and FIG. 4C is a plan view of the suction part 11 having another shape. The suction part 11 in FIG. 4A is a circular hole with a diameter L, and a longitudinal elastic modulus adjusting layer 14 is formed on the surface of a cylindrical base material 13 with a hole.

The longitudinal elastic modulus of the surface of the suction roll 1 in the present invention is 1.0 × 10 ¹ MPa or more and 1.5 × 10 ⁵ MPa or less. If the longitudinal elastic modulus of the substrate 13 is within this range, the longitudinal elastic modulus adjusting layer 14 may not be particularly formed.

  The shape of the suction part 11 may be circular as shown in FIG. 4 (a). However, it is only necessary that the film 2 can be adsorbed on the surface by reducing the pressure inside the suction roll 1, so that it is rectangular as shown in FIG. 4 (c). There is no particular limitation.

  Next, a method for removing dust on the surface of the film 2 by the foreign matter removing apparatus 10 of the present embodiment will be described with reference to FIG. The film 2 that contacts the suction roll 1 with a predetermined holding angle θ is conveyed in the direction of arrow a with a constant tension. The suction roll 1 rotates in the direction b in the figure at the same speed as the conveyance of the film 2. As long as the surface speed of the suction roll 1 and the moving speed of the film 2 are the same, the suction roll 2 may be driven by rotating with the film 2 or a drive roll having a drive source for driving the film 2 to rotate. There may be.

  The cleaning head 3, which is separated from the suction roll 1 by a predetermined distance d and is located at a position corresponding to the holding angle θ, has a high pressure from the air outlet 31 in order to remove dust on the surface of the film 2 being conveyed. Air is spouted out. By this high-pressure air, dust on the surface of the film 2 is peeled off. The pressure of the high pressure air is preferably 500 kPa to 1000 kPa. The higher the pressure of the high-pressure air, the better the dust removal capability. However, when the pressure is too high, the shape of the suction portion 11 tends to be formed on the surface of the film 2 that contacts the suction roll 1 due to the pressure of the high-pressure air. Therefore, the above range is preferable.

  The air containing the separated and removed dust is sucked by two air suction ports 32 arranged in parallel with the air jet port 31 and on the upstream side and the downstream side in the transport direction of the film 2. It is preferable that the suction force by the air suction port 32 sucks the air containing dust ejected from the air jet port 31 and prevents the air containing dust from exiting the foreign matter removing apparatus 10. By doing in this way, the dust removed from the surface of the film 2 can be removed without going out of the foreign matter removing apparatus 10.

  At this time, the suction roll 1 is depressurized by a decompression pump connected to the decompression port 12. By this decompression, the film 2 on the surface is adsorbed to the suction part 11 which is a hole formed on the surface of the suction roll 1. Therefore, conventionally, there is a problem that the film is pulled to the cleaning head 3 side together with the air sucked by the air suction port 32, and the film comes into contact with the vicinity of the air suction port 32 to cause scratches. Since the film 2 is adsorbed to the surface by 1, dust on the surface of the film 2 can be sufficiently removed without causing contact with the cleaning head 3.

Further, the longitudinal elastic modulus of the surface of the suction roll 1 is 1.0 × 10 ¹ MPa or more and 1.5 × 10 ⁵ MPa or less.

When the longitudinal elastic modulus exceeds 1.5 × 10 ⁵ MPa, the surface of the film 2 is pressed against the hole of the suction part 11 of the suction roll 1 when high-pressure air is blown, and as a result, the shape mark of the suction part 11 becomes a film. 2 remains on the surface and becomes a problem as a product. In particular, as an optical film used for a liquid crystal display device or the like, light is refracted at the shape mark of the suction portion 11 and causes display unevenness. Moreover, also when it is less than 1.0 * 10 < ¹ > MPa, the surface of the film 2 bites into the suction part 11, and the shape trace of the suction part 11 arises.

Examples of the material having a longitudinal elastic modulus within the above range include rubber, Teflon (registered trademark), high density polyethylene, polypropylene, polyethylene terephthalate, polystyrene, nylon, magnesium, aluminum alloy, titanium, and reinforced fiber plastic. The longitudinal elastic modulus was measured using an ultrasonic method. In the ultrasonic method, the longitudinal elastic constant and the Poisson's ratio are obtained from the longitudinal wave velocity and the transverse wave velocity, and the transverse elastic constant is obtained from the transverse wave velocity from the velocity of the ultrasonic wave (transverse wave and longitudinal wave) transmitted in the solid. The measurement device is an MBS8000 type sound velocity measuring device manufactured by Matec, and a sample with a parallel plane (16 mmφ x 10 mm thickness) is produced. An ultrasonic pulse is incident from one side of the sample, and both end surfaces of the sample are subjected to multiple reflections. To generate ultrasonic echoes. This is received by a sensor, and the ultrasonic velocity, longitudinal wave velocity V ₁ and transverse wave velocity V _S are obtained from the time interval between pulse echoes and the distance between both surfaces of the sample, and the longitudinal elastic modulus E is calculated from the following equation.

  Moreover, it is preferable that the opening length L of the suction part 11 on the surface of the suction roll 1 is 10 μm or more and 5000 μm or less. In the case of the circular hole in FIG. 4A, the opening length L is the diameter, and in the case of the rectangular hole as in FIG. 4C, the length of the diagonal line. In addition to the above, the shape of the hole may be a polygon. In the case of a polygon, the length of the longest diagonal line among the diagonal lines is the opening length L.

  By making the opening length L of the suction part 11 in the above range, the film 2 can be sufficiently sucked to the suction roll 1 side, and the film 2 is not pressed by the hole of the suction part 11 to be deformed, and is more shaped. The generation of the trace is suppressed, which is preferable.

  As the base material 13 used for the suction roll 1, a metal cylinder in which a hole is formed by an etching process or the like, a mesh-shaped cylinder in which a metal wire is knitted, or the like can be used.

  Moreover, a general rubber layer can be used for the longitudinal elastic modulus adjusting layer 14 formed on the surface of the base material 13. Other than the above materials, any material can be used as long as it can adsorb the film and stably convey it. In particular, in terms of dimensional stability and workability, a cylinder using Ni, Cr, or the like with a hole formed by etching is preferable.

  In the present embodiment, the longitudinal direction of the air ejection port 31 is arranged in parallel to the direction of the rotation axis of the suction roll 1, and the longitudinal direction of the air suction port 32 is parallel to the longitudinal direction of the air ejection port 31. Although it arrange | positions, it is preferable to also provide the air suction port arrange | positioned in the position which opposes the width direction both ends of the film 2 and the longitudinal direction is parallel to the running direction of the film 2. FIG.

  FIG. 5 shows that the cleaning head 3 is opposed to the first air suction port 32, the air suction port of which the longitudinal direction is parallel to the longitudinal direction of the air outlet 31, and both ends of the film 2. It is the top view which looked at what was equipped with the 2nd air suction port 33 with which the longitudinal direction was arrange | positioned in parallel with the running direction a of this film 2 from the suction roll 1 side. By providing the second air suction port 33 in this way, air leaking from the vicinity of both ends of the film 2 of the cleaning head 3 to the outside of the foreign matter removing apparatus can be eliminated. Therefore, all the dust removed by the foreign matter removing device can be sucked by the air suction ports 32 and 33 and will not adhere to the surface of the film 2 again.

  In order to remove dust adhering to the surface of the suction roll 1 or the hole inner wall of the suction portion 11, it is preferable to bring the adhesive roll into contact with the surface of the suction roll 1.

  FIG. 6 is a cross-sectional view of the foreign matter removing device 10 that includes the suction roll 1 and the dust removing roll 41 that removes the dust attached to the adhesive roll 4. By bringing the adhesive roll 4 into contact with the suction roll 1 in this way, the dust attached to the surface of the suction roll 1 and the dust attached to the hole of the suction portion 11 can be removed, and the film 2 of the suction roll 1 can be removed. Decrease in the adsorptive power for adsorbing can be prevented over a long period of time, and dust adhering to the surface of the film 2 can be reduced. The dust removing roll 41 is a roll wound with an adhesive film. After a predetermined amount of dust on the surface of the adhesive roll 4 is adhered, the surface film is removed so that a film having a new adhesive surface is exposed. I have to.

  By using the foreign matter removing apparatus 10 as described above, dust adhering to the traveling film surface can be surely removed, and the front and back surfaces of the film are not damaged.

  Next, the case where the foreign matter removing apparatus of this embodiment is used in a laminated film manufacturing apparatus will be described as an example.

  FIG. 7 is a schematic diagram of a film production apparatus for producing a hard coat film by forming a coating film on a base film as a film.

  In the figure, 100 indicates a laminated film manufacturing apparatus. An apparatus for manufacturing a hard coat film using the laminated film manufacturing apparatus 100 includes an object supply unit 200, an application unit 300, a drying unit 400, a cooling unit 500, an active energy ray irradiation unit 700, and a recovery unit. 600. The supply unit 200 includes a feeding device (not shown) that feeds the original winding 4 in which the film 201 is wound around the core 3.

  A foreign matter removing device 10 is disposed between the supply unit 200 and the coating unit 300.

  The foreign matter removing apparatus 10 peels and removes the dust adhering to the surface on the coating surface side of the film 2 continuously conveyed from the supply unit 200 with high-pressure air from an air outlet provided in the cleaning head 3. The air containing dust is sucked in by the air suction port. Since the details of the removal method have been described above, they are omitted here.

  The film 2 from which the dust on the coated surface has been removed by the foreign matter removing device 10 is coated with a hard coat layer at the coating portion.

  The coating unit 300 includes a backup roll 301 that holds the film 2, a coating head 302 that coats the coating liquid onto the continuously conveyed film 2 held by the backup roll 301, and a coating liquid from the coating head 302 during coating. And a decompression chamber 303 provided on the upstream side of the coating head 302 in order to stabilize a bead (a pool of coating solution) formed between the coating head 302 and the film 2.

  The coating liquid discharged from the coating head 302 includes an active energy ray-curable resin and a solvent, and the flow rate thereof can be adjusted by a pump (not shown). The flow rate of the coating liquid discharged from the coating head 302 is determined to be an amount capable of stably forming a coating layer having a predetermined thickness when continuously coated under the conditions of the coating head 302 adjusted in advance.

  The decompression chamber 303 can adjust the degree of decompression. The decompression chamber 303 is connected to a decompression blower (not shown), and the inside is decompressed. The decompression chamber 303 is in a state where there is no air leakage, and the gap between the decompression chamber 303 and the backup roll is adjusted to be narrow so as to form a stable coating liquid bead.

  The drying unit 400 dries the wet coating film applied on the workpiece 201 by the coating unit 300.

  The cooling unit 500 cools the temperature of the film 201 having the coating film dried by the drying unit 400 and adjusts the temperature to an appropriate temperature.

  The coating film applied to the film 2 with a certain thickness is adjusted through the drying unit 400 so that the residual solvent content becomes a predetermined amount.

  After the adjustment, the active energy ray is irradiated to the coating film by the active energy ray irradiation unit 700 to cure the coating film.

  The collection unit 600 winds up the object to be coated 2 on which the coating film is formed.

  As described above, it is possible to produce a hard coat film in which a hard coat layer is formed as a coating film in a state where there is almost no dust adhering to the film surface as a base material before the coating process. With this film, it is possible to produce a high-quality film free from cissing failures caused by dust during coating and shape marks on the back surface.

EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to this Example.
(Examples 1 to 10, Comparative Examples 1 and 2)
The films of Examples 1 to 10 and Comparative Examples 1 and 2 were produced as follows.

<< Production of film to be used as substrate >>
(Dope composition)
Cellulose triacetate (acetyl substitution degree 2.88) 100 parts by mass Ethylphthalyl ethyl glycolate 5 parts by mass Tinuvin 109 (manufactured by Ciba Japan) 1 part by mass Tinuvin 171 (manufactured by Ciba Japan) 1 part by mass Silicon oxide fine particles (Aerosil 200V) 0.1 parts by weight Methylene chloride 430 parts by weight Methanol 90 parts by weight The above composition was put into a sealed container, kept at 80 ° C. under pressure and completely dissolved while stirring.

  Next, the dope composition was filtered, cooled and kept at 33 ° C., and evenly cast on a stainless steel band. After the solvent was evaporated until peeling became possible, the width was removed by a tenter after peeling from the stainless steel band. It is dried while gripping, stretched to 1.1 times in the width direction, and further dried while being transported by a large number of rolls, wound around a core, film thickness 40 μm, width 1.5 m, length 2000 m. Film roll was obtained.

  The obtained film roll was attached to the film manufacturing apparatus of FIG.

<Conditions for foreign material removal equipment>
As the foreign matter removing device, the foreign matter removing device 10 shown in FIG. 1 was used.

  As the suction roll 1, a SUS-made cylinder (base material 13) having a thickness of 10 mm and a diameter of 150 mm was used, and those having different longitudinal elastic modulus shown in Table 1 were produced. In this table, the surface materials CFRP1, CFRP2, urethane 1 and urethane 2 are formed by forming CFRP (carbon fiber reinforced plastic) and urethane on the SUS base material as the longitudinal elastic modulus adjusting layer 14, respectively. The material of urethane was adjusted, and the ratio of carbon fiber to resin was adjusted to CFRP so that the longitudinal elastic modulus shown in FIG. The thickness of the longitudinal elastic modulus adjusting layer 14 was 5 mm. Moreover, the shape of the suction part 11 formed on the surface of the suction roll 1 was circular. Table 1 shows the diameter.

  The film holding angle θ was 30 °. Table 1 shows the distance d from the cleaning head, the air pressure at the air outlet, and the suction pressure at the air suction port.

  The conveyance speed of the film was 15 m / min, and dust on the film surface before coating was removed.

<Applying hard coat layer>
A hard coat layer was applied to the surface of the film from which dust on the surface was removed by the foreign matter removing apparatus 10.

As a hard coat layer,
(Clear hard coat layer (CHC layer) coating composition)
Dipentaerythritol hexaacrylate monomer 60 parts by mass Dipentaerythritol hexaacrylate dimer 20 parts by mass Dipentaerythritol hexaacrylate trimer or higher component 20 parts by mass Irgacure 184 (manufactured by Ciba Japan) 2 parts by mass Isopropyl alcohol 50 parts by weight Ethyl acetate 50 parts by weight Methyl ethyl ketone 50 parts by weight The surface of the prepared film was extruded and coated with the above clear hard coat layer coating composition (viscosity 5.9 mPa · s) (coater type: die, reduced pressure) Degree: -1000 Pa, coating liquid discharge amount: 21 g / m ² , coating speed: 50 m / min), and then drying by adjusting the hot air temperature and air volume in the drying step. After drying in the drying step, it was cooled with a cooling device, and then irradiated with ultraviolet rays using an ultraviolet irradiation facility to produce a hard coat film.

<Evaluation>
The shape traces of the suction part 11 on the surface in contact with the suction roll 1 were observed with the naked eye over the entire lengths of the films of Examples 1 to 10 and Comparative Examples 1 and 2 (hard coat films). The number per 100 m ² was calculated and determined as follows. If it is 4/100 m ² or more, there is a problem as a product.

Rank 1: 0 / 100m ²
Rank 2: 1-3 / 100m ²
Rank 3: 4 to 10 pieces / 100 m ²
Rank 4: 10 or more / 100m ²
Moreover, the coating film by the side of the hard-coat layer of the produced hard-coat film was observed, the repellency failure of 100 micrometers or more was counted, the number per 100 m < ² > was calculated, and it determined as follows. If it is 4/100 m ² or more, there is a problem as a product.

A: 0 / 100m ²
○: 1-3 pieces / 100 m ²
Δ: 4 to 10 pieces / 100 m ²
×: 10 or more / 100 m ²
The results are shown in Table 1.

From the results in Table 1, it can be seen that the shape elasticity of the surface of the suction roll is 1.0 × 10 ¹ MPa or more and 1.5 × 10 ⁵ MPa or less because the shape marks are suppressed in the film. Moreover, when Examples 7-10 are compared, it turns out that the opening length of the suction part of the surface of a suction roll is 10 micrometers or more and 5000 micrometers or less from the surface of the shape mark suppression of a film surface. In addition, when comparing Examples 1 to 4, it is preferable that the pressure of the air outlet is 500 kPa to 1000 kPa, because the effect of removing dust is high from the number of repelling failures, and shape marks on the film are also suppressed. Recognize.
(Example 11)
As Example 11, a film was prepared and evaluated in the same manner as in Example 1 except that the cleaning head was changed to that shown in FIG. As a result, the repelling failure was evaluated as 評 価, and it was found that the amount of dust adhering to the film before coating was further reduced. From this, as the air suction port of the cleaning head, the first air suction port disposed in parallel with the air jet port, and the second air surface facing both ends of the film and disposed in parallel with the running direction of the film. It can be said that it is preferable to have the air suction port from the viewpoint of dust removal effect.
Example 12
As Example 12, a film was prepared and evaluated in the same manner as in Example 1 except that, among the conditions of Example 1, an adhesive roll for cleaning the surface of the suction roll was disposed. As a result, the repelling failure was evaluated as 評 価, and it was found that the amount of dust adhering to the film before coating was further reduced. From this, it can be said that it is preferable to arrange an adhesive roll for removing dust on the surface of the suction roll.

DESCRIPTION OF SYMBOLS 10 Foreign material removal apparatus 1 Backup roll, suction roll 2 Film 3 Cleaning head 31 Air jet 32, 33 Air suction port 11 Suction part 12 Pressure reducing port 13 Base material 14 Longitudinal elastic modulus adjustment layer 4 Adhesive roll 41 Dust removal roll 100 Laminated film Manufacturing apparatus 200 Supply unit 300 Application unit 301 Backup roll 302 Application head 303 Decompression chamber 304 Application device 400 Drying unit 500 Cooling unit 600 Recovery unit 700 Active energy ray irradiation unit

Claims (6)

A backup roll that contacts and rotates with the film at a predetermined angle;
A cleaning head disposed at a predetermined distance from the film in contact with the backup roll;
The cleaning head is
An air outlet for ejecting air for peeling off and removing dust adhering to the surface of the film;
An air suction port for sucking air from the air ejection port containing dust,
In the apparatus for removing foreign matter from the film surface having
The backup roll is a suction roll having a suction part opened on the surface,
An apparatus for removing foreign matter on a film surface, wherein the suction roll has a surface having a longitudinal elastic modulus of 1.0 × 10 ¹ MPa to 1.5 × 10 ⁵ MPa in contact with the film. The foreign matter removing apparatus for a film surface according to claim 1, wherein an opening length of the suction portion on the surface of the suction roll is 10 µm or more and 5000 µm or less. The apparatus for removing foreign matter from a film surface according to claim 1 or 2, wherein an air pressure ejected from the air ejection port is 500 kPa or more and 1000 kPa or less. The cleaning head is
The longitudinal direction of the air outlet is a direction parallel to the axis of rotation of the suction roll;
As the air suction port,
A first air suction port whose longitudinal direction is arranged in parallel with the air jet port;
4. The air suction port according to claim 1, further comprising: a second air suction port facing the both end portions of the film and having a longitudinal direction arranged in parallel with a running direction of the film. Foreign material removal device for film surface. The apparatus for removing foreign matter on a film surface according to any one of claims 1 to 4, further comprising an adhesive roll that contacts the surface of the suction roll and removes dust adhering to the suction roll. In the method for producing a film comprising a step of removing foreign matter on the surface of the film by blowing high-pressure air on the surface of the film to be conveyed,
The step of removing foreign matter on the surface of the film,
On the surface of the film in contact with the surface of the rotating suction roll having a longitudinal elastic modulus of 1.0 × 10 ¹ MPa to 1.5 × 10 ⁵ MPa with a predetermined holding angle,
High-pressure air is ejected from the air ejection port of a cleaning head having an air ejection port and an air suction port to the surface of the film to peel off and remove dust adhering to the surface of the film, and the film is placed in the air suction port. A method for producing a film, comprising sucking air containing dust separated and removed from the surface of the film.

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