JP2009240941A - Curing apparatus of coating film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form an enclosure space for fully reducing an oxygen concentration without bringing a casing and a flexible film surface too close even under the condition that the flexible film continuously travels. <P>SOLUTION: The curing apparatus 24 includes: the casing 38 which is formed in a box shape having an opened surface facing the roller support surface of the flexible film 14, and forms a roughly sealed enclosure space surrounded by the flexible film surface by covering the flexible film 14 so as to be close to the flexible film 14; an inert gas supply part for supplying an inert gas into the enclosure space; and an ultraviolet lamp house 44 for irradiating a coating film 42 with ultraviolet rays from the transparent part of the casing 38 through the enclosure space. In the casing 38, a flange part 38F is extended imitating the shape of the roller support surface from the lower end of the sidewall of the casing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coating film curing apparatus, and more particularly to a coating film curing apparatus suitable for curing a coating film under a condition in which an oxygen concentration is freely controlled.

  In recent years, the demand for optical films is increasing. Typical examples of the optical film include films having various functions such as an optical compensation film used as a retardation plate in a liquid crystal cell, an antireflection film, and an antiglare film.

  As a typical method for producing such an optical film, a coating liquid is applied to the surface of a strip-like flexible film (hereinafter referred to as “flexible film”) using various coating apparatuses, Examples of the method include forming a coating film having various compositions by drying and then curing. For this curing, UV (ultraviolet) curing means is often adopted.

  Curing efficiency in such a UV curing process is important for improving productivity and improving product quality. In particular, when oxygen is present, it becomes an inhibiting factor in the polymerization / crosslinking process, and the strength of the coating film and the bondability between the flexible film as the base substrate and the coating film are lowered, and as a result, the hardness and adhesion of the coating film are reduced. It is known that power etc. will decrease.

  That is, the coating film is usually formed by polymerizing a low-molecular resin called a monomer with UV light to polymerize it, but the oxygen concentration is often lowered under UV irradiation. This is because, under UV irradiation, radicals generated from the initiator play a large role in the polymerization of the resin, but these radicals disappear when oxygen is present. Therefore, it is important to reduce the oxygen concentration.

  Various proposals have conventionally been made as methods and apparatuses for dealing with such oxygen intervention (see Patent Document 1).

  This proposal employs a configuration in which the UV irradiation portion is filled with an inert gas to remove oxygen. Specifically, the entire irradiated portion is covered with a metal member or the like, and an inert gas is introduced therein. Thereby, it is supposed that the oxygen concentration of a UV irradiation part can be hold | maintained at 1000 ppm or less.

  In addition, another proposal has been made to obtain uniform surface hardness with less unevenness of curing while reducing the amount of inert gas consumption (see Patent Document 2). In this proposal, in order to lower the oxygen concentration in the reaction chamber, a configuration is adopted in which the ultraviolet irradiator and the reaction chamber are separated and a seal mechanism is provided at the entrance and exit of the reaction chamber.

  However, the proposal of Patent Document 1 has a structure in which the cooling air of the ultraviolet irradiation lamp easily enters the processing zone, and the gap between the traveling support and the casing is large, and further, the dead space is set in the curing processing zone. It takes time until the oxygen concentration is reduced to a predetermined oxygen concentration due to the presence of gas, and the amount of inert gas supplied increases.

  In addition, since the proposal of Patent Document 2 has a large reaction chamber, it takes time until the oxygen concentration is lowered to a predetermined oxygen concentration, and the amount of inert gas supplied increases. The oxygen concentration lower limit attainable level in this apparatus is 300 ppm. Further, an inert gas is used as a sealing means for the entrance and exit of the ultraviolet curable material. Furthermore, in this device layout, the ultraviolet curable material itself may be plastically deformed by ultraviolet irradiation, and is not suitable for high-power ultraviolet irradiation.

Therefore, the applicant has proposed a coating film curing apparatus shown in Patent Document 3. In this curing device, the angle β in the circumferential direction of the roller where the casing is disposed is made smaller than the winding angle α of the flexible film around the roller, so that the casing is not affected by the flutter of the flexible film. It was made possible to make it close to the flexible film surface. In addition, the lower end of the side wall of the casing can be expanded and contracted toward the flexible film, and the gap between the lower end of the side wall and the flexible film surface can be reduced as much as possible. Thereby, it is supposed that the clearance between the lower end of the side wall of the casing and the flexible film surface can be controlled to 0.5 to 10 mm.
JP-A-11-104562 JP 11-268240 A JP 2007-75794 A

  Although the configuration of the curing apparatus of Patent Document 3 can form a deoxygenated atmosphere having a smaller oxygen concentration than Patent Documents 1 and 2, it cannot be said that it is sufficient, and further improvement is necessary. Curing of the coating film tends to cause curling of the flexible film. If the lower end of the side wall of the casing is too close to the surface of the flexible film, it will improve the formation of a deoxygenated atmosphere, but it may be curled. There exists a problem that a flexible film may contact a side wall lower end.

  Therefore, in consideration of curling of the flexible film due to the curing of the coating film, the coating can sufficiently reduce the oxygen concentration in the casing even if the casing and the flexible film are not too close to each other. There has been a need for a film curing apparatus.

  The present invention has been made in view of such circumstances, and even under conditions where the flexible film continuously runs, the oxygen concentration is sufficiently lowered without bringing the casing and the flexible film surface too close together. Since the enclosed space can be formed, a low oxygen concentration deoxygenation atmosphere can be formed in the enclosed space with a small supply amount of inert gas, and even if the flexible film curls due to curing of the coating film, it can be applied to the casing. It aims at providing the hardening apparatus of the coating film which does not contact.

  In order to achieve the above object, the present invention irradiates actinic radiation on actinic radiation curable coating film formed on the surface of a belt-like flexible film whose back surface is wound around and supported by a roller. In the coating film curing device for curing the coating film, the curing device is formed in a box shape having an opening facing the roller support surface of the flexible film, and is close to the flexible film. And a casing that forms a substantially hermetically enclosed space surrounded by the flexible film surface, and an inert gas is supplied into the enclosed space to form a deoxygenated atmosphere in the enclosed space. An inert gas supply unit that irradiates the active film toward the coating film from the transparent portion of the casing through the enclosed space, and the casing has a side wall at its lower end. The roller Provided is a coating film curing device in which a flange-like flange portion is extended following the shape of the holding surface, and an inert gas supplied to the enclosed space is blown out from an inner peripheral opening of the flange portion. .

  Here, the “roller support surface of the flexible film” refers to an area of the flexible film that is in contact with the roller surface, and fluttering of the flexible film is suppressed in this area. The “active ray” refers to an electron beam, ultraviolet rays, and visible rays, and ultraviolet rays are preferable from the viewpoint of easy handling.

  Under the condition that the flexible film continuously runs, the structure in which the lower end of the side wall of the conventional casing is made as close as possible to the surface of the flexible film leaks the inert gas supplied into the enclosure space, and the enclosure The oxygen concentration in the space cannot be sufficiently reduced (for example, 100 ppm or less (volume%)).

  The reason for this is that entrained air is generated on the film surface by running the flexible film, and this entrained air forms a space between the lower end of the side wall of the casing and the surface of the flexible film (gap on the inlet side). The oxygen enters the enclosure space and pushes up the oxygen concentration in the enclosure space. Further, the inert gas supplied into the enclosed space escapes from the clearance on the outlet side of the enclosed space accompanying the accompanying air.

  Therefore, according to the first aspect of the present invention, the flange-shaped flange portion is extended from the lower end of the side wall of the casing in accordance with the shape of the roller support surface, and the inert gas supplied to the enclosed space is opened to the inner peripheral opening of the flange portion. It was made to blow out from and touched the coating film. This makes it difficult for the inert gas to escape from the enclosed space and makes it difficult for the entrained air to enter the enclosed space, so that the coating film can be increased under conditions where the oxygen concentration in the enclosed space is freely controlled (low oxygen concentration). Can be cured at speed.

  In other words, compared with the conventional case where the lower end of the side wall of the casing is brought closer to the flexible film, a narrow planar gap having a large ventilation resistance is provided between the surfaces of the flange portion and the surface of the flexible film. Is formed. By forming this planar gap, when an inert gas is supplied to the enclosed space, the internal pressure of the enclosed space with respect to the external pressure (pressure outside the casing) can be increased, so that the accompanying air enters the enclosed space. This makes it difficult for the inert gas to escape to the outside. In addition, the large airflow resistance of the planar gap plays a role of blocking the accompanying wind. For these reasons, a very low oxygen deoxygenation atmosphere can be formed in the enclosed space.

  Accordingly, an enclosure space that can sufficiently reduce the oxygen concentration in the casing can be formed even if the casing and the flexible film surface are not too close to each other as much as possible (for example, 10 mm or less). Even if curled, it becomes difficult to contact the casing, which contributes to prevention of quality defects. Further, since the inert gas is difficult to escape from the enclosed space, the enclosed space can be set to a low oxygen level with a small amount of supplied inert gas.

  As a result, the coating film is cured at high speed under conditions where the oxygen concentration is freely controlled (low oxygen concentration), improving the quality of the coating film, greatly improving productivity, and supplying inert gas. The amount can be reduced.

  A second aspect of the present invention is the method according to the first aspect, wherein the distance between the surface of the flange portion and the roller support surface of the flexible film is 20 mm or more and 50 mm or less, and the width of the flange portion is 10 mm or more and 100 mm or less. It is characterized by being.

  According to the second aspect of the present invention, in consideration of curling of the flexible film due to the curing of the coating film, the distance between the surface of the flange portion and the roller support surface is set to 20 mm or more and 50 mm or less. This is because the flange portion preferably has a width of 10 mm or more and 100 mm or less in order to exhibit a sufficient ventilation resistance in the gap. If the thickness is less than 10 mm, sufficient ventilation resistance cannot be obtained, and if it exceeds 100 mm, it interferes with the irradiation light path when irradiating the coating film with active rays from the transparent portion of the casing.

  In fact, with this configuration, the oxygen concentration in the enclosed space can be reduced to 100 ppm (volume%) or less, and even if the flexible film curls due to the hardening of the coating film, it does not contact the casing.

  A third aspect of the present invention provides the flexible film according to the first or second aspect, wherein the flexible film has uncoated portions at both end portions in the width direction, the coating film is formed, and the flexible film in the width direction of the flexible film. The flange portion faces the uncoated portion.

  According to the third aspect of the present invention, the flange portions in the width direction of the flexible film are made to face the uncoated portions where the coating liquid is not applied at both ends of the flexible film. The inert gas blown out from the peripheral opening can be efficiently applied to the coating film surface.

  Claim 4, Claim 5 and Claim 6 show various forms of the flange portion. When bent inward with respect to the side wall of the casing, when bent outwardly, It is a case where it is bent to both the outside and the outside.

  A seventh aspect according to any one of the first to sixth aspects, wherein the flange portion is slidably supported by the flange main body portion supported by a lower end of a side wall of the casing and the flange main body portion. And a slide plate slidable in the width direction of the film.

  The width of the flexible film and the width of the coating film applied to the flexible film are not constant and usually vary depending on the lot to be manufactured. According to the seventh aspect, since the slide plate can be slid in the flexible film width direction with respect to the flange main body, even if the coating width changes depending on the product lot to be manufactured, the inner peripheral opening of the flange portion can be changed. The opening length in the width direction of the flexible film can be adjusted according to the width of the coating film that needs to be cured.

  As described above, according to the present invention, the enclosure space in which the oxygen concentration can be sufficiently lowered without bringing the casing and the flexible film surface too close to each other even when the flexible film continuously runs. Since it can be formed, a low oxygen concentration deoxygenation atmosphere can be formed in the enclosed space with a small supply amount of inert gas. Moreover, even if a flexible film curls because a coating film hardens | cures, it does not contact a casing.

  Accordingly, it is possible to provide a coating film curing apparatus in which the coating film is cured at a high speed under conditions in which the oxygen concentration is freely controlled, the quality of the coating film is improved, and the quality defect is unlikely to occur.

  Hereinafter, preferred embodiments of a coating film curing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a configuration diagram of an optical film production line to which a coating film curing apparatus according to the present invention is applied.

  As shown in FIG. 1, the optical film production line 10 is fed with a flexible film 14 that is a transparent support from a feeder 12. The flexible film 14 is guided by the guide roller 16 and sent to the dust remover 18. The dust remover 18 removes dust adhering to the surface of the flexible film 14.

  A gravure coating device 20 is provided downstream of the dust remover 18. The coating liquid is applied to the flexible film 14, and a coating film (for example, an antiglare layer) is applied to the surface of the flexible film 14. The When the coating liquid is applied to the flexible film 14 over the entire width in the width direction of the flexible film 14, the coating liquid turns around on the back surface. Usually, it is applied leaving (see FIG. 4). Details of the gravure coating apparatus 20 will be described later.

  A drying device 22 is provided downstream of the gravure coating device 20, the coating film on the flexible film 14 is dried, and heated to a temperature at which the coating film is easily cured by a subsequent curing device.

  Then, the curing device 24 of the present invention is provided downstream of the drying device 22, and a desired polymer is formed by crosslinking and curing the coating film by actinic ray irradiation, for example, ultraviolet irradiation. Finally, the flexible film 14 on which the polymer is formed is wound up by a winder 26 provided downstream of the curing device 24. Details of the curing device 24 will be described later.

  Note that a guide roller 16 is provided throughout the optical film production line 10 so as to wrap and support the flexible film 14 and to enable the conveyance (running) of the flexible film 14. . The guide roller 16 is a freely rotatable roller member and has a length substantially the same as the width of the flexible film 14 (in this example, slightly longer than the width of the flexible film 14).

  The gravure coating apparatus 20 has a desired film thickness on the flexible film 14 by a gravure roller 28 that is rotated and driven with respect to the flexible film 14 that is guided by the upstream guide roller 17 and the downstream guide roller 19. An apparatus for applying a coating solution.

  The gravure roller 28, the upstream guide roller 17 and the downstream guide roller 19 have substantially the same length as the width of the flexible film 14. The gravure roller 28 is driven to rotate in the direction indicated by the arrow in FIG. This rotational direction is the reverse direction with respect to the traveling direction of the flexible film 14. In addition, the application | coating by the drive of forward rotation contrary to FIG. 1 can also be employ | adopted depending on application | coating conditions.

  The driving method of the gravure roller 28 is direct driving (shaft direct connection) by an inverter motor, but a combination of various motors and a reduction gear (gear head), or a method using winding transmission means such as a timing belt from various motors. Good.

  The cell shape on the surface of the gravure roller 28 may be any of a known pyramid type, a lattice type, a diagonal type, and the like. That is, an appropriate cell may be selected depending on the coating speed, the viscosity of the coating liquid, the coating layer thickness, and the like.

  A liquid receiving pan 30 is provided below the gravure roller 28, and the liquid receiving pan 30 is filled with a coating liquid. The lower half of the gravure roller 28 is immersed in the coating solution. With this configuration, the coating liquid is supplied to the cells on the surface of the gravure roller 28.

  A doctor blade 32 is installed so that the tip of the gravure roller 28 is in contact with the position of about 10 o'clock in order to scrape off the excess of the coating liquid before coating. The doctor blade 32 is urged by an urging means (not shown) in the direction of the arrow in FIG. 1 around the rotation center 32A at the base end.

  The upstream guide roller 17 and the downstream guide roller 19 are supported in a state substantially parallel to the gravure roller 28. The upstream guide roller 17 and the downstream guide roller 19 are preferably configured such that both ends are rotatably supported by bearing members (ball bearings or the like) and no drive mechanism is attached.

The above-described gravure coating apparatus 20 is particularly effective for thin-layer coating. For example, an optical system that performs ultra-thin layer coating with a wet (wet) coating amount of 5 ml / m ² or less (a film thickness during coating of 5 μm or less). It can be suitably applied to a film production line.

  In the present embodiment, the gravure coating apparatus 20 may be installed in a clean atmosphere such as a clean room. At that time, the cleanliness is preferably class 1000 or less, more preferably class 100 or less, and still more preferably class 10 or less.

  In the present invention, the number of coating layers of the coating solution applied simultaneously is not limited to a single layer, and can be applied to a simultaneous multilayer coating method as necessary.

  In addition to the gravure coating apparatus 20 described above, the coating liquid is applied by a bar coater, roll coater (transfer roll coater, reverse roll coater, etc.), die coater, extrusion coater, fountain coater, curtain coater, dip coater, spin coater. A spray coater or a slide hopper can be employed.

  In the optical functional film production line shown in FIG. 1, the tension of the flexible film 14 is preferably 100 to 500 N / m.

  Next, the coating film curing device 24 which is a characteristic part of the present invention will be described. FIG. 2 is an external view of the curing device 24, and the backup roller 34 and the flexible film 14 are indicated by a two-dot chain line in order to easily show the flange portion 38F of the casing 38. 3 is a cross-sectional view of the main part along the line aa in FIG. 2, and FIG. 4 is a cross-sectional view of the main part along the line bb in FIG. It is shown in cross section.

  As shown in these drawings, the curing device 24 covers the flexible film 14 by covering the flexible film 14 so as to come close to the backup roller 34 that wraps and supports the continuously running flexible film 14. A casing 38 that forms a substantially hermetically enclosed space 36 surrounded by the surface, and an inert gas supply unit 40 that supplies an inert gas in the enclosed space 36 to form a deoxygenated atmosphere in the enclosed space 36. And an ultraviolet lamp house 44 (active ray irradiation unit) that irradiates ultraviolet rays toward the coating film 42 (see FIG. 4) from the transparent portion of the casing 38 through the enclosed space 36.

  The casing 38 is formed in a box shape that opens toward the roller support surface of the flexible film 14 that is wrapped around and supported by the backup roller 34, and extends from the lower ends of the four side walls 38 </ b> A, 38 </ b> B, 38 </ b> C, 38 </ b> D of the casing 38. A flange-shaped flange portion 38F is extended along the shape of the roller support surface. That is, as can be seen from FIGS. 2 and 3, the flange portion 38 </ b> F is formed concentrically following the shape of the roller support surface of the flexible film 14, that is, the surface shape of the backup roller 34. And the blower outlet 41 by which the inert gas supplied in the surrounding space 36 in the surrounding space opening of the flange part 38F is blown toward the coating film surface is formed, and the surface of the flange part 38F and the flexible film A narrow planar gap 43 is formed between the fourteen surfaces. By setting it as the planar clearance 43, compared with the linear clearance formed by the lower end of the side wall of a casing and the flexible film 14 like the past, ventilation resistance can be remarkably enlarged. The flange portion 38F may be formed as a part of the casing 38 or may be formed as a separate member from the casing 38.

  As shown in FIG. 4, the distance between the casing side walls 38B and 38D facing each other in the width direction of the flexible film 14 is substantially equal to the length in the width direction of the flexible film 14, or the width dimension of the flexible film and the backup. It is preferably formed so as to be between the roller width of the roller 34. On the other hand, as shown in FIG. 3, the distance between the casing side walls 38 </ b> A and 38 </ b> C facing each other in the roller circumferential surface direction is the entire length of the roller support surface on which the flexible film 14 is wound around and supported by the backup roller 34. It is preferable to form a roller support surface having a central angle β smaller than the corresponding roller central angle α. The roller support surface with the central angle β is an area where the flexible film 14 is securely wound and supported by the backup roller 34, and therefore the flexible film 14 does not flutter when the flexible film 14 travels. Therefore, the gap distance between the surface of the flange portion 38F formed on the casing 38 and the flexible film 14 can be accurately reduced without being affected by the fluttering of the flexible film 14 during traveling.

  Moreover, the casing 38 and the ultraviolet lamp house 44 are completely separated, and light transmissive glass (transparent plate 38E and irradiation window 44A) is installed in each. In the embodiment of the present invention, a single ultraviolet lamp house 44 is provided for one casing 38, but a plurality of transparent plates 38E are provided in the casing 38, and each transparent plate 38E is provided with each transparent plate 38E. Correspondingly, an ultraviolet lamp house 44 having an irradiation window 44A may be provided. As the glass plate of the transparent plate 38E and the irradiation window 44A, quartz glass having a high ultraviolet transmittance can be suitably used. Thereby, the ultraviolet ray irradiated from the ultraviolet lamp house 44 is efficiently irradiated to the coating film on the flexible film 14.

  By separating the casing 38 and the ultraviolet lamp house 44 in this way, cooling air for cooling an ultraviolet lamp (not shown) provided in the ultraviolet lamp house 44 enters the casing, which is a curing treatment zone. Can be surely prevented. When the cooling air enters the casing 38, even if a large amount of inert gas is supplied into the casing 38, the oxygen concentration does not fall below a certain value. Further, by completely separating the casing 38 and the ultraviolet lamp house 44, it is possible to prevent the casing 38 from being affected by thermal deformation of the ultraviolet lamp house 44 (thermal deformation due to a temperature rise during ultraviolet irradiation).

  Although not shown, it is preferable that the casing 38 has a jacket structure that can circulate cooling water so as to eliminate thermal deformation due to a temperature rise at the time of ultraviolet irradiation from the ultraviolet lamp house 44.

  Thus, by arranging the casing 38 on the roller support surface of the flexible film 14 and taking measures against thermal deformation and thermal expansion of the casing 38, the surface of the flange portion 38F, the surface of the flexible film 14, Can be formed with high accuracy. The separation distance S between the surface of the flange portion 38F and the roller support surface of the flexible film 14 is preferably 20 mm or more and 50 mm or less, and the width (W) of the flange portion 38F is preferably 10 mm or more and 100 mm or less. (See FIG. 4). In FIG. 4, the separation distance S is shown as a distance from the surface of the flexible film 14 that is not yet applied. However, since the coating film 42 is a micron-order thin film (for example, 10 μm or less), the separation distance S Is substantially the same as the distance from the surface of the flexible film 14 to the coated portion (coated film).

  Further, as shown in FIG. 5, the width L2 of the coating film 42 applied narrowly with respect to the length L1 of the flexible film 14 in the width direction, and the width of the flexible film 14 in the flexible film width direction of the outlet 41 of the casing 38. It is preferable to form the width (W1) of the flange portion 38F in the flexible film width direction so that the length L3 is equal. As one method for achieving this, as shown in FIG. 6, the flange portion 38F includes a flange main body portion 38a supported by the lower end of the casing side wall, and a slide plate 38b slidably supported by the flange main body portion 38a. It is preferable to comprise. A pair of slide plates 38 b are provided in the width direction of the flexible film 14. By fitting the flange main body 38a and the slide plate 38b with, for example, a dovetail structure, a simple slide mechanism can be formed, and the confidentiality of the slide mechanism portion can be secured. Thus, by configuring the flange portion 38F in the width direction of the flexible film 14 with the slide plate 38b, the length in the width direction of the flexible film 41 of the air outlet 41 is adjusted according to the width of the coating film 42. be able to.

  The flange portion 38F described above has been described in the case where the flange portion 38F is bent inward from the lower end of the casing side wall as shown in FIG. 4, but the case where the flange portion 38F is bent outward from the lower end of the casing side wall as shown in FIG. Also, as shown in FIG. 8, it is possible to employ a case where the casing is bent from the lower end of the casing side wall to both the inside and the outside.

  As shown in FIGS. 3 and 4, the inert gas supply unit 40 includes a pair of blow pipes 40 </ b> A provided at both ends in the width direction of the flexible film inside the casing 38, and a blow pipe from an inert gas supply source (not shown). The gas pipe 40C supplies an inert gas to 40A. The blowing pipe 40A is formed as a long pipe along the traveling direction of the flexible film 14, and is supported on the inner wall surface of the casing 38 via a fixing member (not shown). A slit-like jet outlet 40B is formed in the outlet pipe 40A, and the inert gas supplied to the outlet pipe 40A is blown out from the outlet 40B. In this example, the two outlet pipes 40A are provided. However, the outlet pipes 40A may be further provided at the center of the casing 38, and the arrangement position and number of the outlet pipes 40A are not limited.

  Further, an oxygen concentration sensor 48 is provided in the casing 38 so that the oxygen concentration measurement at a corresponding location in the enclosed space 36 can be measured. 3 and 4, the oxygen concentration sensor 48 is provided at the upper position in the casing 38, but it is more preferable to provide the oxygen concentration sensor 48 in the vicinity of the coating film 42. The oxygen concentration sensor 48 preferably has a measurable accuracy with a minimum unit of 0.1 ppm. Further, a pressure sensor 50 is provided in the casing 38 so that the pressure in the enclosed space 36 can be measured. Then, the measurement values measured by the oxygen concentration sensor 48 and the pressure sensor 50 are fed back to the above-described inert gas supply source via the signal cable, and the inert gas supply amount supplied to the blowing pipe 40A is adjusted as appropriate. The That is, the oxygen concentration in the enclosure space 36 is adjusted to 100 ppm or less, and the internal pressure in the enclosure space 36 is adjusted to be a positive pressure with respect to the external pressure outside the casing. A plurality of oxygen concentration sensors 48 and pressure sensors 50 may be provided in the enclosed space 36.

  Next, a basic configuration of an antiglare antireflection film suitable as an optical film manufactured by the optical film manufacturing line 10 will be described with reference to the drawings.

  The embodiment shown in FIG. 9 is an example of an antiglare antireflection film, and is an order of a transparent support 1 made of triacetylcellulose (TAC), a hard coat layer 2, an antiglare layer 3, and a low refractive index layer 4. It has the following layer structure. Reference numeral 5 denotes anti-glare particles, and the protruding portion from the anti-glare layer is also covered with the low refractive index layer 4. The refractive index of the binder of the antiglare layer is 1.57 to 1.80, and the refractive index of the low refractive index layer is 1.43 to 1.48.

  In the antireflection film, the low refractive index layer preferably satisfies the following formula (I).

mλ / 4 × 0.7 <n1d1 <mλ / 4 × 1.3 (I)
In formula (I), m is a positive odd number (generally 1), n1 is the refractive index of the low refractive index layer, and d1 is the film thickness (nm) of the low refractive index layer. λ is the wavelength of the light used.

  The refractive index of the material (binder part) forming the antiglare layer is preferably 1.57 to 2.00, more preferably 1.60 to 1.80. The refractive index of triacetyl cellulose (TAC) preferably used as the substrate is 1.48. The refractive index of the binder forming the antiglare layer is 1.57 to 2.00, but the antireflective property is lowered if it is too small or too large. The high refractive index material is composed of a monomer having two or more ethylenically unsaturated groups and fine particles having a particle size of 100 nm or less composed of at least one oxide selected from titanium, aluminum, indium, zinc, tin, antimony and zirconium. In this case, since the particle diameter of the fine particles is sufficiently smaller than the wavelength of light, no scattering occurs and the optical material behaves as an optically uniform substance. This is described in JP-A-8-110401.

  Since this anti-glare layer causes surface scattering due to the anti-glare particles dispersed in the high refractive index material, it does not have the effect of optical interference in the anti-glare layer. In the high refractive index hard coat layer that does not have anti-glare particles, due to optical interference due to the difference in refractive index between the hard coat layer and the substrate, a large amplitude of reflectivity is seen in the wavelength dependence of the reflectivity. The antiglare reflection preventing effect deteriorates and color unevenness occurs at the same time. However, in the antiglare reflection preventing film of the present invention, these problems are solved by the scattering effect due to the surface unevenness of the antiglare layer.

  As the base material used as the flexible film 14, a preferable one is selected depending on its use, and specifically, a transparent support is used. As the transparent support, it is preferable to use a plastic film.

  Examples of the polymer forming the plastic film include cellulose esters (eg, triacetyl cellulose, diacetyl cellulose), polyamides, polycarbonates, polyesters (eg, polyethylene terephthalate, polyethylene naphthalate), polystyrene, and polyolefins.

  Among these, triacetyl cellulose (TAC) is preferable. When the antiglare antireflection film is used in a liquid crystal display device, it is disposed on the outermost surface of the display by providing an adhesive layer on one side. Since triacetyl cellulose is used as a protective film for protecting the polarizing layer of the polarizing plate, it is preferable in terms of cost to use the antiglare antireflection film as it is for the protective film.

  The compound used for the hard coat layer is preferably a polymer having a saturated hydrocarbon or polyether as the main chain, and more preferably a polymer having a saturated hydrocarbon as the main chain. The binder polymer is preferably crosslinked. The polymer having a saturated hydrocarbon as the main chain is preferably obtained by a polymerization reaction of an ethylenically unsaturated monomer. In order to obtain a crosslinked binder polymer, it is preferable to use a monomer having two or more ethylenically unsaturated groups.

  Examples of monomers having two or more ethylenically unsaturated groups include esters of polyhydric alcohols and (meth) acrylic acid (eg, ethylene glycol di (meth) acrylate, 1,4-cyclohexanediacrylate, pentaerythritol tetra). (Meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, di Pentaerythritol hexa (meth) acrylate, 1,2,3-cyclohexanetetramethacrylate, polyurethane polyacrylate, polyester polyacrylate), vinylbenzene and its derivatives (e.g., , 4-divinylbenzene, 4-vinylbenzoic acid-2-acryloyl ethyl ester, 1,4-divinyl cyclohexanone), vinyl sulfones (e.g., divinyl sulfone), acrylamides (e.g., include methylenebisacrylamide) and methacrylamide.

  The polymer having a polyether as the main chain is preferably synthesized by a ring-opening polymerization reaction of a polyfunctional epoxy compound. These monomers having an ethylenically unsaturated group need to be cured by a polymerization reaction by ionizing radiation, heat or the like after coating. If necessary, this can be performed by a known method using a photopolymerization initiator, a photosensitizer, or the like.

  Instead of or in addition to the monomer having two or more ethylenically unsaturated groups, a crosslinked structure may be introduced into the binder polymer by reaction of a crosslinkable group. Examples of the crosslinkable functional group include an isocyanate group, an epoxy group, an aziridine group, an oxazoline group, an aldehyde group, a carbonyl group, a hydrazine group, a carboxyl group, a methylol group, and an active methylene group. Vinylsulfonic acid, acid anhydride, cyanoacrylate derivative, melamine, etherified methylol, ester and urethane, and metal alkoxide such as tetramethoxysilane can also be used as a monomer for introducing a crosslinked structure.

  A functional group that exhibits crosslinkability as a result of the decomposition reaction, such as a block isocyanate group, may be used. Further, the crosslinking group is not limited to the above compound, and may be one showing reactivity as a result of decomposition of the functional group. These compounds having a crosslinking group need to be crosslinked by heat after application.

  In the formation of the binder, the antiglare layer can be formed by using a high refractive index monomer or high refractive index inorganic ultrafine particles in addition to the material forming the hard coat layer. Such a high refractive index monomer preferably contains at least one selected from the group consisting of an aromatic ring, a halogen atom other than a fluorine atom, a sulfur atom, a phosphorus atom and a nitrogen atom in the monomer structure. Examples of such high refractive index monomers include bis (4-methacryloylthiophenyl) sulfide, vinyl naphthalene, vinyl phenyl sulfide, 4-methacryloxyphenyl-4'-methoxyphenyl thioether and the like.

The amount of the high refractive index monomer used is adjusted so that the binder has a target film refractive index. The high refractive index inorganic ultrafine particles preferably include ultrafine particles having a particle size of 100 nm or less, and comprising at least one oxide selected from titanium, aluminum, indium, zinc, tin, antimony and zirconium. The ultrafine particles are more preferable. Examples of such ultrafine particles include TiO ₂ , Al ₂ O ₃ , In ₂ O ₃ , ZnO, SnO ₂ , Sb ₂ O ₃ , ITO, ZrO _{2 and the} like. The content of the inorganic ultrafine particles in the binder is preferably 10 to 90% by weight, more preferably 20 to 80% by weight, based on the total weight of the antiglare layer.

  In the antiglare layer, antiglare particles of a resin or an inorganic compound are used for the purpose of imparting antiglare properties and preventing reflectance deterioration due to interference of the hard coat layer and preventing uneven color. The average particle diameter is preferably 1.0 to 10.0 μm, more preferably 1.5 to 5.0 μm. Moreover, it is preferable that the anti-glare particle | grains of a particle size smaller than the binder film thickness of an anti-glare layer are less than 50% of this anti-glare particle whole by weight ratio.

The coating amount of the antiglare particles is preferably 10 to 1000 mg / m ² , more preferably 30 to 100 mg / m ² . The particle size distribution can be measured by a Coulter counter method, a centrifugal sedimentation method, or the like, but the distribution is considered in terms of the particle number distribution. The thickness of the antiglare layer is preferably 0.5 to 10 μm, more preferably 1 to 5 μm. Further, it is preferable that the difference in refractive index between the binder of the antiglare layer and the antiglare particles is less than 0.05 in order to reduce internal scattering in the antiglare layer.

  A fluorine-containing resin is used for the low refractive index layer, and a fluorine-containing compound (resin) that is crosslinked by heat or ionizing radiation is preferably used. The refractive index of the low refractive index layer is 1.38 or more and 1.49 or less. When this value is too low, the film strength is lowered, and when it is too high, the antireflection property is deteriorated.

  Moreover, the dynamic friction coefficient of this layer becomes like this. Preferably it is 0.03-0.15, More preferably, it is 0.07-0.10. If the dynamic friction coefficient is too small, the slip of the handling film becomes a problem, and if it is too large, the scratch resistance is deteriorated. The contact angle of the low refractive index layer with respect to water is preferably 90 to 120 °, more preferably 100 to 120 °. If this is too small, the antifouling property is poor.

  Examples of the crosslinkable fluorine polymer compound constituting such a resin include a perfluoroalkyl group-containing silane compound (for example, (heptadecafluoro-1,1,2,2-tetradecyl) triethoxysilane) and the like, and fluorine-containing compounds. Examples thereof include a fluorine-containing copolymer having a monomer component and a monomer component for imparting a crosslinkable group as constituent components.

  Specific examples of the fluorine-containing monomer component include, for example, fluoroolefins (for example, fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoroethylene, hexafluoropropylene, perfluoro-2,2-dimethyl-1,3-dioxole) Etc.), (meth) acrylic acid partial or fully fluorinated alkyl ester derivatives (for example, Biscoat 6FM (manufactured by Osaka Organic Chemical Co., Ltd.) and M-2020 (manufactured by Daikin)), fully or partially fluorinated vinyl ethers and the like.

  As a monomer component for imparting a crosslinkable group, it has a carboxyl group, a hydroxyl group, an amino group, a sulfonic acid group, etc. in addition to a (meth) acrylate monomer having a crosslinkable functional group in the molecule in advance such as glycidyl methacrylate. (Meth) acrylate monomers (for example, (meth) acrylic acid, methylol (meth) acrylate, hydroxyalkyl (meth) acrylate, allyl acrylate, etc.) can be mentioned. It is known from JP-A-10-25388 and JP-A-10-147739 that the latter can introduce a crosslinked structure after copolymerization.

  Moreover, you may use the copolymer with the monomer which does not contain a fluorine atom other than the polymer which uses the said fluorine-containing monomer as a structural unit. There are no particular limitations on the monomer units that can be used in combination, such as olefins (ethylene, propylene, isoprene, vinyl chloride, vinylidene chloride, etc.), acrylic esters (methyl acrylate, ethyl acrylate, 2-ethylhexyl acrylate), Methacrylic acid esters (methyl methacrylate, ethyl methacrylate, butyl methacrylate, ethylene glycol dimethacrylate, etc.), styrene derivatives (styrene, divinylbenzene, vinyl toluene, α-methylstyrene, etc.), vinyl ethers (methyl vinyl ether, etc.), Vinyl esters (vinyl acetate, vinyl propionate, vinyl cinnamate, etc.), acrylamides (N-tertbutylacrylamide, N-cyclohexylacrylamide, etc.), methacrylamides, acrylonitrile It can be mentioned conductor like.

  Each layer of the antireflection film can be formed by coating by a dip coating method, an air knife coating method, a curtain coating method, a roller coating method, a wire bar coating method, a gravure coating method or an extrusion coating method. Two or more layers may be applied simultaneously. The methods of simultaneous application are described in US Pat. Nos. 2,761,789, 2,941,898, 3,508,947, and 3,526,528 and Yuji Harasaki, Coating Engineering, page 253, Asakura Shoten (1973). The thickness of the substrate is completely different depending on the application. The antiglare layer is as described above, the low refractive index layer is preferably 0.08 to 0.15 μm, more preferably 0.09 to 0.12 μm, and the hard coat layer is preferably 1 to 10 μm, more preferably. Is 3-6 μm.

  The anti-glare antireflection film only needs to be formed by sequentially providing an anti-glare layer and a low refractive index layer on a base material. For the low refractive index layer, the refractive index defined in this specification is used. Two or more low refractive index layers having different constituent components may be provided. The hard coat layer is preferably further provided between the substrate and the antiglare layer, and two or more hard coat layers having different constituent components may be provided.

  The antireflection film is applied to an image display device such as a liquid crystal display device (LCD), a plasma display panel (PDP), an electroluminescence display (ELD), or a cathode ray tube display device (CRT). When the antireflection film has a transparent support, the transparent support side is bonded to the image display surface of the image display device.

  As an image display device to which an antiglare reflective film can be applied, JP-A-7-287102 (for example, paragraphs (0059) to (0061) and FIGS. 14 and 15) and JP-A-7-333404 (for example, paragraph ( 0078) to (0079) and FIGS. 19 and 20).

  Next, an optical film manufacturing method using the optical film manufacturing line shown in FIG. 1 will be specifically described. First, the flexible film 14 having a thickness of 40 to 300 μm is fed from the feeder 12. The flexible film 14 is guided by the guide roller 16 and sent to the dust remover 18, whereby the dust attached to the surface of the flexible film 14 is removed. Then, the coating liquid is applied to the flexible film 14 by the gravure coating apparatus 20. After the application is completed, a coating film is formed through the drying device 22. Further, a desired polymer is formed by irradiating the coating film with ultraviolet rays by the curing device 24 and crosslinking the binder.

  The curing device 24 has a flange-like flange portion 38F formed to follow the shape of the roller support surface of the flexible film 14 supported around the backup roller 34 from the lower end of the side wall of the casing 38. A narrow planar gap 43 is formed between the surface of the portion 38F and the surface of the flexible film 14, and this planar gap 43 can greatly increase the airflow resistance. As a result, it is possible to form the enclosed space 36 in which the oxygen concentration can be sufficiently lowered without bringing the casing 38 and the flexible film too close to each other. Actually, the separation distance between the surface of the flange portion 38F and the roller support surface of the flexible film 14 is set to 20 mm or more and 50 mm or less, and the width of the flange portion is set to 10 mm or more and 100 mm or less, thereby The oxygen concentration of 36 can be controlled to be 100 ppm or less. Therefore, the curing conditions of the coating film 42 can be controlled within the optimum range, and the quality of the coating layer, particularly scratch resistance, adhesion, etc. can be improved. In order to control the curing condition of the coating film 42 within the optimum range, the oxygen concentration in the enclosed space 36 is more preferably controlled to 100 ppm or less, and further preferably controlled to 10 ppm or less.

  In the case of the present invention, a deoxygenated atmosphere having a low oxygen concentration of 100 ppm or less in the enclosed space 36 even if the distance between the lower end of the side wall of the casing and the flexible film 14 is not close to 10 mm or less as in the prior art. Therefore, even if the flexible film 14 curls due to the hardening of the coating film 42, it is difficult to contact the casing 38. Therefore, poor quality due to contact is unlikely to occur.

  And the flexible film 14 in which this polymer was formed is wound up by the winder 26.

  The embodiment of the coating film curing device 24 according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various modes can be adopted. For example, in each embodiment of the present invention, nitrogen gas is used as an inert gas mainly for cost reasons, but other inert gases (carbon dioxide or rare gas) may be used.

  In each embodiment of the present invention, the production of an optical film is mainly described. However, the present invention is not limited to this, and can be applied to all types using an actinic radiation curable resin that requires hardness. is there.

  The curing device 24 of the present invention was used in the optical film production line 10 shown in FIG. 1 to apply and cure the coating liquid, and the oxygen concentration controllability inside the sealed space was evaluated.

  As each coating solution, one having the following composition was used.

[Light diffusion (anti-glare) hard coat coating solution A]
The coating solution for light diffusing (antiglare) hard coat is 75 g of a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (DPHA, Nippon Kayaku Co., Ltd.), with a particle size of about 30 nm. 240 g of a fine particle dispersion-containing hard coat coating solution (Desolite Z-7401, manufactured by JSR Corporation) was dissolved in 52 g of a mixed solvent of methyl ethyl ketone / cyclohexanone = 54/46 wt%.

  10 g of a photopolymerization initiator (Irgacure 907, manufactured by Ciba Fine Chemicals Co., Ltd.) was added to the resulting solution, and after stirring and dissolving, a fluorosurfactant (Megafac F) comprising a 20% by weight fluorine-containing oligomer methyl ethyl ketone solution was added. -176PF, manufactured by Dainippon Ink Co., Ltd. (0.93 g) was added (note that the refractive index of the coating film obtained by applying this solution and curing it with ultraviolet rays was 1.65).

  Further, 20 g of crosslinked polystyrene particles having a number average particle size of 2.0 μm and a refractive index of 1.61 (SX-200HS, manufactured by Soken Chemical Co., Ltd.) were mixed with 80 g of methyl ethyl ketone / cyclohexanone = 54/46 wt%. Stir and disperse in a solvent with a high speed disperser at 5000 rpm for 1 hour, and filter through polypropylene filters with pore sizes of 10 μm, 3 μm, and 1 μm (PPE-10, PPE-03, and PPE-01, respectively, manufactured by Fuji Film Co., Ltd.) 29 g of the resulting dispersion was added and stirred, and then filtered through a polypropylene filter having a pore size of 30 μm to prepare a coating solution for an antiglare layer.

  The viscosity and surface tension of the coating solution were 0.007 N · s / m 2 and 0.033 N / m.

[Coating liquid B for low refractive index layer]
200 g of methyl isobutyl ketone was added to 200 g of thermally crosslinkable fluorine-containing polymer (trade name: JN-7221, manufactured by JSR Corporation) having a refractive index of 1.46, and after stirring, filtered through a polypropylene filter having a pore size of 1 μm. A coating solution for a low refractive index layer was prepared.

  As the flexible film 14, a TAC (triacetyl cellulose film) manufactured by Fuji Film Co., Ltd. having a thickness of 80 μm and a width of 650 mm was run. The running speed of the flexible film 14 is set to 30 m / min, a light diffusing (antiglare) hard coat coating solution is applied with a gravure coater, and a light diffusing (antiglare) hard coat layer having a thickness of 4 μm. Formed. On top of this, the low refractive index layer coating solution B is applied using a bar coater, dried at 80 ° C., and further thermally crosslinked at 120 ° C. for 10 minutes to form a low refractive index layer having a thickness of 0.096 μm Formed.

  As the backup roller 34 of the curing device 24, an SS hard Cr plated product having a diameter of 500 mm and a length of 800 mm was used. The width of the casing 38 is 760 mm, the length of the flange portion 38F extending inward from the lower end of the side wall of the casing 38 is set to 30 mm, and the tip of the flange portion 38A is positioned at the end of the coating film 42.

  Quartz glass having a thickness of 3 mm was used as the transparent plate 38E and the irradiation window 44A. In this curing device 24, the angle α is 180 ° and the angle β is 160 °.

As the ultraviolet lamp house 44 (UV device), an air-cooled metal halide lamp (200 W / cm, emission length: 800 mm, irradiation amount: 600 mJ / cm ² ) was used.

  Nitrogen gas with a purity of 99.9999% was used as the inert gas. The temperature of nitrogen gas was 22 ° C., and the pressure was 0.4 MPa. There are two nitrogen gas supply units.

  A zirconia sensor (minimum range: 0 to 1 ppm, measurement accuracy: ± 2%) was used as the oxygen concentration sensor. An oxygen concentration sensor was disposed in the vicinity of the coating film 42, and the oxygen concentration in the vicinity of the coating film was measured.

(1) Oxygen concentration measurement result The distance between the flange portion and the flexible film surface supported by the backup roll is 20 mm, the conveyance speed of the flexible film is 30 m / min, and the flow rate of the inert gas for purging (nitrogen) is set. Table 1 shows the measurement results of the oxygen concentration with 1000 L / min and the presence or absence of the flange portion of 30 mm. Further, FIG. 10 shows the relationship between the time from the start of purge with flange and the oxygen concentration.

  Table 1 shows the oxygen concentration in the enclosed space reached 8 minutes after starting the purge of the inert gas.

  As can be seen from the results in Table 1, when the flange portion was present, the oxygen concentration decreased to 70 ppm, and the oxygen concentration in the enclosed space could be reduced to the target of 100 ppm or less.

  On the other hand, when there is no flange portion, the oxygen concentration is reduced only to 75000 ppm, and in order to make it lower, the distance between the flange portion and the flexible film surface supported by the backup roll is narrowed. Alternatively, it is necessary to significantly increase the purge flow rate of the inert gas.

  As can be seen from FIG. 10, in the case with a flange, the oxygen concentration in the enclosed space decreased to about 200 ppm in about 1 minute from the start of the purge, and decreased to 100 ppm after about 4 minutes. Thus, the oxygen concentration in the enclosed space can be lowered to an extremely low level in a short time.

(2) Contact evaluation during curling Curing was evaluated by applying and curing the optical film production line shown in FIG. 1 using the coating solution A for light diffusing (antiglare) hard coat.

  When the flange part is 30 mm, the flexible film transport speed is 30 m / min, the flow rate of nitrogen is 1000 L / min, and the distance between the flange part and the backup roll is changed, the curled flexible film contacts the casing. Table 2 shows the contact determination result of whether or not to do so.

  As can be seen from Table 2, in the conventional case where the distance (mm) between the flange portion and the roller and the support film surface was 10 mm, the flexible film contacted the casing, causing scratches and dust.

  On the other hand, the flexible film did not come into contact with the casing by separating the distance (mm) between the flange portion and the roller to the support film surface up to 20 mm. Therefore, from the above (1), the present invention can reduce the oxygen concentration and prevent contact with the casing because the oxygen concentration in the enclosed space can be reduced to 100 ppm or less even if the distance is 20 mm.

Configuration diagram of an optical film production line to which a coating film curing apparatus according to the present invention is applied External view of coating film curing apparatus of the present invention Main part sectional drawing along the aa line of FIG. Sectional drawing of the principal part along the bb line of FIG. Sectional drawing of the principal part along the cc line of FIG. The perspective view explaining the slite board of a flange part Explanatory drawing explaining another aspect of a flange part Explanatory drawing explaining another aspect of a flange part Sectional drawing which shows the basic composition of an anti-glare antireflection film Explanatory drawing explaining the oxygen concentration fall situation from the purge start of an inert gas in a present Example

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Optical film production line, 14 ... Flexible film, 24 ... Curing apparatus, 34 ... Backup roller, 36 ... Enclosure space, 38 ... Casing, 38a ... Flange main-body part, 38b ... Slide board, 38E ... Transparent board, 38F ... Flange portion, 40 ... Inert gas supply unit, 40A ... Blowing pipe, 41 ... Inert gas outlet, 42 ... Coating film, 43 ... Planar gap, 44 ... Ultraviolet lamp house, 44A ... Irradiation window, 48 ... Oxygen concentration sensor, 50 ... Pressure sensor

Claims (7)

A coating film curing device for irradiating actinic radiation to an actinic radiation curable coating film formed on the surface of a strip-like flexible film that is continuously run with its back surface wrapped around a roller and curing the coating film In
The curing device is:
A surface of the flexible film facing the roller support surface is formed in a box shape having an opening, and is covered so as to be close to the flexible film, thereby being substantially sealed surrounded by the flexible film surface. A casing that forms an enclosed space;
An inert gas supply unit configured to supply an inert gas into the enclosed space to form a deoxygenated atmosphere in the enclosed space;
An actinic radiation irradiating unit that irradiates the actinic radiation toward the coating film from the transparent portion of the casing through the enclosed space; and
In the casing, a flange-like flange portion is extended from the lower end of the side wall following the shape of the roller support surface, and the inert gas supplied to the enclosed space is blown out from the inner peripheral opening of the flange portion. An apparatus for curing a coating film, which is characterized.   The distance between the surface of the flange portion and the roller support surface of the flexible film is 20 mm or more and 50 mm or less, and the width of the flange portion is 10 mm or more and 100 mm or less. A coating film curing apparatus.   The flexible film has uncoated portions at both ends in the width direction to form the coated film, and the flange portion in the flexible film width direction faces the uncoated portions. The coating film curing device according to claim 1, wherein the coating film curing device is a coating film.   The coating film curing device according to claim 1, wherein the flange portion is bent inward from a lower end of a side wall of the casing.   The coating film curing device according to claim 1, wherein the flange portion is bent outward from a lower end of a side wall of the casing.   The coating film curing device according to claim 1, wherein the flange portion is bent both inside and outside from a lower end of a side wall of the casing. The flange portion is
A flange body supported by the lower end of the side wall of the casing;
The coating according to any one of claims 1 to 6, comprising a slide plate that is slidably supported by the flange main body and slidable in a width direction of the flexible film. Film curing device.

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