JP4793206B2 - Method and apparatus for producing uneven film - Google Patents

Description

  The present invention relates to a method and apparatus for producing a concavo-convex film having a structure in which a resin layer having a concavo-convex surface is laminated on a film substrate.

  2. Description of the Related Art Conventionally, a film having a concavo-convex surface (referred to as a concavo-convex film) has been manufactured for uses such as decorative materials for decorative films or industrial materials such as optical parts such as lenticular lenses. FIG. 4 shows an example of the structure of a concavo-convex film used as a lens film for ensuring light uniformity in a backlight mechanism of an optical display or a liquid crystal display. The concavo-convex film 1 has a structure in which a resin layer 3 having a striped concavo-convex shape having a triangular cross section formed on the surface is laminated on a film base 2.

  The method and apparatus for producing the concavo-convex film having such a structure are disclosed in Japanese Patent No. 3616109 “Manufacturing method of light control film” (Patent Literature 1), Japanese Patent No. 3424136 “Film lens for surface light source and the same. It is described in “Surface light source” (Patent Document 2). As shown in FIG. 5, the devices described in these patents include a roll intaglio 5 having an uneven surface to be formed on the surface of the uneven film 1, and a curable resin liquid on the outer surface of the roll intaglio 5. 6, a nip roll 8 that presses the film base 2 against the roll intaglio 5 so that the traveling film base 2 wraps around the outer peripheral surface of the roll intaglio 5, and a contact portion between the roll intaglio 5 and the nip roll 8 Radiation is applied to cure the curable resin liquid that is retained on the outer peripheral surface of the intaglio plate 5 and that is in contact with the film substrate 2 and that collects the excess resin liquid falling from the liquid reservoir 9 formed in And a peeling roll 12 for stably peeling the film substrate 2 and the cured resin layer on the surface thereof from the roll intaglio 5. The production of the concavo-convex film by the apparatus having this configuration is performed as follows. That is, the curable resin liquid 6 is supplied to the outer peripheral surface of the roll intaglio 5 by the nozzle 7 in a width narrower than the width of application to the film substrate 2 and much more excessively (about 10 times) than the required application amount. In addition, the resin is spread in the width direction at the contact portion between the roll intaglio 5 and the nip roll 8 and the excess resin liquid is scraped off, leaving an appropriate amount of the curable resin liquid on the surface of the roll intaglio 5, on which the film substrate 2 Is pressed, radiation is irradiated from above by the irradiation device 11 to cure the curable resin liquid, and then the film substrate 2 is peeled off from the roll intaglio 5 via the peeling roll 12. Thereby, the concavo-convex film 1 having a structure in which the resin layer 3 having a concavo-convex shape on the surface is laminated on one surface of the film base 2 is manufactured.

  However, in the method and apparatus described above, since the curable resin liquid is supplied from the nozzle 7 to the roll intaglio 5 much more than the required coating amount, the apparatus for supplying the resin liquid becomes large, There is a problem that a recovery device such as a large defoaming device is required to defoam and reuse the excessive resin liquid scraped off by the nip roll 8.

  Therefore, as shown in FIG. 6, there is also known a manufacturing apparatus in which a nozzle 7 is arranged on the upper side of the roll intaglio 5 and a curable resin liquid having only a necessary coating amount is supplied from the nozzle 7. In this apparatus, the nozzle 7 supplies the resin liquid to the roll intaglio 5 with a width slightly narrower than the coating width for the film substrate 2, expands it to a predetermined coating width with the nip roll 8, and adheres to the film substrate 2. . The other structure is the same as that of the apparatus shown in FIG.

  However, in this apparatus, the resin layer 3 of the produced concavo-convex film 1 may have a defect such as partial or continuous film thickness deficiency or missing in the running direction of the film substrate 2. In some cases, the film thickness may be insufficient or missing even in the region (see FIG. 4) where the surface irregularities are connected. The cause of this defect is considered as follows. That is, although the resin liquid is supplied from the nozzle 7 to the surface of the roll intaglio 5 with a constant thickness, the amount of the resin liquid to be supplied is small and the roll intaglio surface has irregularities. An uneven thickness of the liquid is likely to occur, and an area where the liquid amount is locally insufficient may occur in a partial area in the coating width direction. In addition, clogging may occur in a part of the nozzle 7 in the application width direction, which may cause a region where the liquid amount is insufficient. When the region where the liquid amount is insufficient is generated, the amount of the resin adhered to the film base 2 is insufficient, resulting in the above-described defects. Further, due to unevenness of elasticity on the surface of the nip roll 8 and wrinkles of the film base material 2, the amount of resin that adheres to the surface of the film base material 2 is insufficient, and the above-described defects may occur. These phenomena occur remarkably when the processing speed (traveling speed of the film substrate) is increased, and for this reason, the processing speed could not be increased so much conventionally. In order to prevent this, it is conceivable to increase the amount of resin liquid supplied from the nozzle 7. However, when the amount of resin liquid increases, the liquid pool 9 at the nip roll 8 becomes larger and exceeds the width of the film base 2. Overflow on both sides and processing stops.

Japanese Patent No. 3616109 Japanese Patent No. 3424136

  The present invention has been made in view of such conventional problems, and in producing an uneven film having a structure in which a resin layer having an uneven shape on the surface is laminated on a film substrate, an excessive use of a curable resin liquid is used. It is possible to prevent defects such as insufficient film thickness and missing that may occur partially or continuously in the running direction of the film substrate 2 without causing overflow and increasing the processing speed. It is an object of the present invention to provide a method and an apparatus for producing a concavo-convex film that can be used.

  The invention according to claim 1 of the present invention includes a step of supplying a curable resin liquid at a constant width by a nozzle to a roll intaglio plate having an uneven shape on the outer peripheral surface, and a film base on the outer surface of the roll intaglio plate coated with the curable resin liquid. Supplying the material so as to be wound and pressing it with a nip roll; curing the curable resin liquid on the surface of the roll intaglio in a state covered with the film base material downstream of the nip roll; and bonding the film base material thereto In the method for producing a concavo-convex film having a step of peeling from the roll intaglio together with a cured curable resin, the resin layer of the produced concavo-convex film has a defect such as partial or continuous film thickness deficiency or missing that occurs in the running direction. In order to prevent this, the surface of the intaglio plate between the nozzle and the nip roll is supplemented with a resin liquid which is an area corresponding to the position where the defect is generated. The should do region, in which a structure that a curing resin liquid provided spot feeding step.

  The invention according to claim 2 is the invention according to claim 1, further comprising the step of inspecting the curable resin layer adhered to the film substrate peeled off from the roll intaglio to detect defects, and Based on the detection result, the process has a step of controlling the spot supply position and the spot supply amount of the curable resin liquid in the coating width direction.

  Invention of Claim 3 provides the manufacturing apparatus of the uneven | corrugated film which can be used for implementation of above-mentioned invention of Claim 1, The roll intaglio provided with uneven | corrugated shape in the outer peripheral surface, and this roll intaglio A nozzle for supplying a curable resin liquid at a constant width, a film base material supplying means for supplying a film base material to the outer surface of the roll intaglio, and the film base material on the outer surface of the roll intaglio plate coated with the curable resin liquid A nip roll pressed so as to wind, a dispenser for spot-feeding a curable resin liquid to a partial region of the outer peripheral surface of the roll intaglio between the nozzle and the nip roll, and a curable resin liquid on the outer peripheral surface of the roll intaglio And an irradiation device for irradiating the roll intaglio to cure the film, and the curable resin bonded and cured to the film base material. It is obtained by a structure having a conveying means for conveying detached from Lumpur intaglio.

  The invention according to a fourth aspect is the invention according to the third aspect, further comprising: a curable resin layer provided on a transport path of the film base material peeled off from the roll intaglio and adhered to the film base material. A camera for photographing the surface, and a signal from the camera is image-processed to detect a defect on the surface of the curable resin layer. Based on the detection result, the position of the dispenser in the coating width direction is controlled and the dispenser It has the structure which has a control apparatus which controls the spot supply amount by.

  In the method and apparatus of the present invention described above, the curable resin liquid is spotted on the surface of the intaglio plate between the nozzle and the nip roll and in the region corresponding to the defect occurrence position of the produced concavo-convex film, that is, the region to be replenished with the resin liquid. By adopting the supply structure, the resin liquid can be spot-supplied only to a portion where there is a risk of causing a defect due to insufficient resin liquid, and the spot supply position is downstream of the resin liquid supply position by the nozzle. Therefore, the resin liquid that is spot-fed can be supplied so as to come into contact with the resin liquid that has been applied in advance, so that the wettability of the resin liquid that is spot-fed is good, Immediate integration makes it possible to solve the shortage of resin liquid by simply supplying a small amount of resin liquid. For this reason, it is possible to prevent the occurrence of defects such as partial or continuous film thickness insufficiency or missing in the running direction in the resin layer of the produced uneven film. Further, since a small amount of resin liquid is supplied in the spot, it hardly affects the spread of the resin liquid in the width direction at the nip roll portion, and the problem of overflow does not occur. Furthermore, since the spot supply of the resin liquid can prevent defects such as insufficient film thickness or missing that may occur in the product, it can be easily handled even when the processing speed is increased. In other words, the processing speed It becomes possible to improve productivity by increasing.

  Here, the position where the resin liquid is spot-supplied can be manually or automatically controlled by visual inspection of the manufactured concavo-convex film and image processing of the surface quality, as in the inventions according to claims 2 and 4. In addition, it is preferable to automatically control the spot supply position and the spot supply amount because it can be controlled with high accuracy without requiring manual operation.

  Hereinafter, preferred embodiments of the present invention will be described. 1 is a schematic perspective view of an apparatus for manufacturing an uneven film according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of the manufacturing apparatus, and FIG. 3 is a mechanism for controlling a spot supply position and a spot supply amount in the manufacturing apparatus. FIG. 7 is a schematic perspective view showing the same or similar parts as those in the conventional example shown in FIGS. In FIG. 1, the apparatus for producing an uneven film includes a roll intaglio 5 having an uneven shape on the outer peripheral surface, a nozzle 7 for supplying a curable resin liquid 6 to the roll intaglio 5 with a constant width, and a film substrate 2. A film substrate supply means (not shown) for supplying the outer peripheral surface of the roll intaglio 5, a nip roll 8 for pressing the film substrate 2 around the outer peripheral surface of the roll intaglio 5 coated with a curable resin liquid, and a nozzle 7 Between the nip roll 8 and the nip roll 8, a dispenser 21 that supplies a spot of the curable resin liquid to a partial region in the coating width direction of the outer peripheral surface of the roll intaglio 5, and the roll to cure the curable resin liquid on the outer peripheral surface of the roll intaglio 5. An irradiation device 11 for irradiating radiation toward the intaglio 5, a transport means for peeling and transporting the film substrate 2 from the roll intaglio 5 together with a curable resin bonded and cured thereto It is provided. This conveying means includes a peeling roll 12 for stably peeling the film substrate 2 from the roll intaglio 5 and a winding device (not shown) for winding the manufactured uneven film 1.

  The roll intaglio 5 has an uneven shape to be imparted to the surface of the resin layer 3 of the uneven film 1 to be manufactured on the outer peripheral surface thereof. This roll intaglio 5 is provided with a passage through which a cooling medium such as cooling water or air passes, and has a structure that prevents a temperature rise by passing the cooling medium through the inside. The roll intaglio 5 is connected to a drive device (not shown) that rotationally drives the roll intaglio 5 at a predetermined speed. The nozzle 7 is capable of discharging a curable resin liquid with a constant width and a constant thickness. The nozzle 7 discharges the resin liquid and supplies the resin liquid to the discharge slit. It has a structure with a manifold. The nozzle 7 is connected to a resin liquid supply means (not shown) for supplying a resin liquid. The nip roll 8 is for pressing the film substrate 2 so as to be wound around the surface of the roll intaglio 5 and has an elastic layer on the surface. The nip roll 8 is rotatably held by a nip roll holding device (not shown) and is held in a form in which the pressing force can be adjusted against the roll intaglio 5. The peeling roll 12 is for stably peeling the film substrate 2 and the resin layer formed on the surface thereof from the roll intaglio 5, and can be freely rotated by a peeling roll holding device (not shown) and the roll intaglio 5. It is held so as to be pressed against. The nip roll 8 and the peeling roll 12 are not limited to being rotatable, and may be configured to be forcibly driven at the same peripheral speed as the roll intaglio 5.

  The irradiation device 11 irradiates radiation for curing the curable resin liquid applied to the surface of the roll intaglio 5. The radiation may be appropriately selected according to the type of resin to be cured. Specifically, infrared rays, visible rays, ultraviolet rays, electron beams, etc. can be exemplified, and electromagnetic waves such as microwaves and X-rays are also used. it can.

  The dispenser 21 is for spot-feeding the curable resin liquid 6a between the nozzle 7 and the nip roll 8 in a partial region in the coating width direction of the outer peripheral surface of the roll intaglio 5. The dispenser 21 can discharge the resin liquid with a constant width and a constant thickness, and has the same structure as the nozzle 7. However, since the dispenser 21 only needs to be able to apply only to a partial region of the application width by the nozzle 7, the discharge width of the dispenser 21 is selected to be much smaller than the nozzle 7, for example, about 5 to 20 mm. Selected. Connected to the dispenser 21 are a resin liquid supply pipe 22 and a pump 23 for supplying the resin liquid. The dispenser 21 is held by a linear motion guide 25 arranged in parallel to the roll intaglio 5 and can be moved to an arbitrary position in the coating width direction. Further, a screw shaft (not shown) connected to a motor 26 is provided. ). With this configuration, by controlling the rotation of the motor 26, the dispenser 21 can be moved to a desired position in the application width direction, and positioned and stopped.

  A camera 28 is arranged on the traveling path of the concavo-convex film 1 peeled off from the roll intaglio 5 and conveyed by the conveying means so as to photograph the surface of the resin layer 3 of the concavo-convex film 1, and its output is a control device 29. To be sent to. The control device 29 performs image processing on the signal sent from the camera 28 and applies a partial or continuous film thickness deficiency or missing defect 31 occurring in the running direction to the resin layer 3 in the coating width direction. On the basis of the function of detecting the position and size of the liquid and the detection result, the motor 26 is rotationally controlled to position the dispenser 21 at the position in the coating width direction corresponding to the defect 31 and then the pump 23 is controlled. The resin liquid is sent to the dispenser 21 with a discharge amount corresponding to the size of the defect 31, and the function of spot supply from the dispenser 21 is provided. Further, a monitor 33 is also connected to the control device 29, and the control device 29 has a function of displaying the defect 31 on the monitor 33 in an enlarged manner and displaying the occurrence position and size in numerical form.

  Next, a method for producing the concavo-convex film 1 used as a lens film in the backlight mechanism of an optical display or a liquid crystal display shown in FIG. 4 using the concavo-convex film manufacturing apparatus having the above-described configuration will be described. Examples of the film substrate 2 include polyesters such as polyethylene terephthalate, polyamides such as nylon, acrylic resins such as polymethyl methacrylate, polyvinyl chloride, polycarbonate, polystyrene, polyacrylate, fluororesin, polypropylene, cellulose triacetate, cellophane, and the like. Or a metal foil made of copper, iron, aluminum or the like, and these may be used alone or as a base material appropriately laminated. As the curable resin for forming the resin layer 3, a known ionizing radiation curable resin or a thermosetting resin can be used. As the ionizing radiation curable resin, ultraviolet ray or electron beam curable resin can be used. For example, acrylate such as urethane acrylate, epoxy acrylate, silicon acrylate, siloxane, unsaturated polyester, acryloyl group, methacryloyl group, etc. It is preferable to use a monomer having a polyfunctional monomer having a polymerizable unsaturated bond as a main component or a prepolymer high crosslink density type resin. When irradiating ultraviolet rays to cure such a curable resin, acetophenones, benzophenones, Michler benzoyl benzoate, α-amino oxime ester, tetramethyl thiuram monosulfide, thioxanthones and the like are used as photopolymerization initiators. As a photopolymerization accelerator (sensitizer), n-butylamine, triethylamine, tri-n-butylphosphine and the like can be mixed and used. Thermosetting resins include phenolic resins, urea resins, diallyl phthalate resins, melamine resins, guanamine resins, unsaturated polyester resins, polyurethane resins, epoxy resins, aminoalkyd resins, melamine-urea cocondensation resins, silicon resins, Polysiloxane resin or the like can be used.

  The curable resin liquid 6 is supplied and applied to the outer peripheral surface of the roll intaglio 5 by a nozzle 7 with a width narrower than the application width to the film base material 2, and the film base material roll (see FIG. The film substrate 2 pulled out from (not shown) is covered and pressed by the nip roll 8. At this time, the resin liquid applied to the surface of the roll intaglio 5 is squeezed by the pressing force of the nip roll 8 against the roll intaglio 5 and a liquid pool (hereinafter referred to as meniscus) 9 is formed at the contact portion between the roll intaglio 5 and the nip roll 8. The meniscus 9 is formed and spreads in the coating width direction to have a predetermined coating width for the film substrate 2. Therefore, the surface of the roll intaglio 5 that has passed through the nip roll 8 is coated with a resin liquid with a predetermined coating width, and the film base 2 is covered therewith. Thereafter, the resin liquid on the surface of the roll intaglio 5 is irradiated with radiation by the irradiation device 11 from above the film base 2 covering the resin base, and the resin liquid is cured and adhered to the film base 2. Thereafter, the film substrate 2 is peeled off from the roll intaglio 5 through the peeling roll 12. As a result, the concavo-convex film 1 having a structure in which the resin layer 3 having a concavo-convex shape on the surface is laminated on one surface of the film base 2 is manufactured, and the concavo-convex film 1 is conveyed downstream, and a winding device (not shown). Z)).

  In the manufacturing process described above, the camera 28 and the control device 29 monitor the surface of the resin layer 3 of the manufactured uneven film 1, and the resin layer 3 has a partial or continuous film thickness deficiency or missing. If a defect 31 such as a defect occurs, the position and size of the defect in the coating width direction are detected, and based on the detection result, the motor 26 is rotationally controlled to position the dispenser 21 at a position corresponding to the defect 31. Then, the pump 23 is controlled to send the resin liquid to the dispenser 21 with a discharge amount corresponding to the size of the defect 31, and spot supply is performed from the dispenser 21. As a result, the resin liquid 6a is replenished by the dispenser 21 to the region where the liquid amount is locally insufficient, so that the shortage of the liquid amount can be eliminated and the occurrence of the defect 31 can be prevented. Here, the application width of the resin liquid 6a spot-supplied by the dispenser 21 is such that an area without the resin liquid is generated for some reason in a partial area in the application width direction of the surface of the roll intaglio plate 5 applied with the resin liquid by the nozzle 7. Even so, the resin liquid 6a to be spot-fed is determined so as to come into contact with the resin liquid 6 existing on both sides of the area without the resin liquid. As a result, the spot-fed resin liquid 6a can be brought into direct contact with the resin liquid 6 previously applied to the surface of the roll intaglio 5 and can be reliably integrated, thereby preventing uneven application. The amount of resin liquid spot supplied by the dispenser 21 is much smaller than the amount of resin liquid supplied by the nozzle 7, so even if the spot supply is performed, the spread of the meniscus 9 on both sides is hardly affected. There is no overflow problem. Thus, it is possible to prevent the occurrence of defects such as insufficient film thickness and missing that may occur in the resin layer 3 simply by spot feeding the resin liquid.

  In the above-described embodiment, the positioning and the discharge amount in the application width direction of the dispenser 21 are configured to automatically control by detecting the defect 31 generated in the concavo-convex film 1, but are configured to be manually adjusted instead of automatic control. It is good. For example, the monitor 33 is looked at, and the position and size of the defect 31 are examined, and the dispenser 21 is positioned at a position in the coating width direction corresponding to the defect by a manual operation accordingly, and the necessary resin liquid is discharged. Good. Further, without providing the camera 28, the surface of the concavo-convex film 1 is visually inspected, or the meniscus 9 in the nip roll portion is visually inspected to find a region where the resin liquid is to be replenished, and the dispenser 21 is positioned manually. A configuration may be adopted in which a necessary resin liquid is discharged. Furthermore, in the above-described embodiment, only one dispenser 21 is used. However, if necessary, a plurality of dispensers 21 may be arranged side by side to prevent defects 31 occurring at a plurality of locations. .

Since it has been verified that the occurrence of defects can be prevented by spot supply by the dispenser 21, the following is shown.
・ Device layout: Structure shown in FIG. 1 / Curable resin liquid: Material name: Acrylic UV curable resin
Physical properties: viscosity 600 cps (40 ° C. at room temperature), specific gravity 1.5
Film base: PET film, width 500 mm × thickness 250 μm
・ Nozzle 7 application width: 400mm
-Resin layer 3 width: 450 mm
・ Spot supply form of resin liquid: described later ・ Irradiation device: UV irradiation Wavelength 350 to 430 nm × 1 lamp ・ Roll intaglio surface unevenness shape: pitch 50 μm, height 25 μm

[Test procedure]
The concavo-convex film 1 was manufactured at a line speed of 15 m / min with a shim having a width of 20 mm sandwiched in the center portion of the nozzle 7 and intentionally stopping the discharge of the resin liquid from that portion.
-Since the resin discharge from the part where the shim is sandwiched is stopped, a region (about 7 to 8 mm) where the resin liquid is not applied is generated on the surface of the roll intaglio 5 downstream of the nozzle 7. Further, the meniscus 9 is formed in the entire coating width in the nip roll portion, but the meniscus in the center portion is small.
-As for the film thickness of the resin layer 3 of the uneven | corrugated film 1 after a process, the center part was thin and the nonuniformity expressed. That is, there was a defect in the region on the concavo-convex film corresponding to the region where the local liquid amount shortage occurred upstream of the nip roll 8. To eliminate this defect, three types of dispensers were used, and Table 1 The resin liquid was spot-supplied manually to the center region of the roll intaglio 5 using the three types of spot supply states shown and using a simple pump (piston pump, 6 mm pipe). At this time, the state of the meniscus 9 was visually inspected, and the surface quality of the obtained uneven film was inspected, and the results shown in Table 1 were obtained.

  As is apparent from the results in Table 1, when the resin liquid was introduced into a droplet with a diameter of 5 mm and when it was continuously introduced with a width of 5 mm, the defect could not be sufficiently improved. However, when the resin liquid was continuously introduced with a width of 10 mm, the defect was improved satisfactorily. I was able to confirm that Here, the reason why the defect can be improved by widening the application width of the spot supply is considered as follows. That is, when the resin liquid is spot-supplied to the area where the resin liquid is not applied to the surface of the roll intaglio 5 downstream of the nozzle 7 (about 7 to 8 mm), when a droplet is introduced with a diameter of 5 mm or continuously with a width of 5 mm. Has a narrow input width, so there is a gap between it and the previously applied resin liquid, and it is easy for air bubbles to be caught in that part, which causes the meniscus to become unstable. In the case of charging, both ends of the spot-fed resin liquid are brought into direct contact with the previously applied resin liquid to be integrated, so that the meniscus is stabilized. Therefore, when there is an area (about 7 to 8 mm) where the resin liquid is not applied on the surface of the roll intaglio 5, when the resin liquid is spot-fed to the area to solve the shortage of the liquid volume, the resin liquid is applied. It is desirable to supply a spot of the resin liquid with a width wider than that of the region that is not.

  In addition, the verification test described above creates an area that is not intentionally ejected at the center of the nozzle and intentionally creates an area that is not coated with resin liquid on the surface of the roll intaglio. Even in this case, defects can be prevented by supplying resin liquid spots. Although it has been verified that it can be done, it is rare that this state occurs during actual operation, and a thin region of the resin liquid is locally formed on the surface of the roll intaglio and often causes defects in the product. In such a case, since the resin liquid is spot-supplied to an area where the coating liquid exists thinly, the wettability of the supplied resin liquid is good. It is not always necessary to select a width larger than the width of the thin region of the coating solution, but it is preferable to select a larger size because the integration of the resin solution spot-fed with the previously applied resin solution is reliable.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments, and can be appropriately changed within the scope of the claims. For example, in the above-described embodiment, a shape in which isosceles triangles are arranged as the concavo-convex shape formed on the surface of the resin layer 3 is shown, but the concavo-convex shape is not limited to this and can be changed to a desired shape. . Moreover, although the triangular groove | channel is formed in the roll intaglio 5 surface in the axial direction of a roll intaglio, it is not restricted to this, You may change so that it may form in the circumferential direction.

1 is a schematic perspective view of an apparatus for producing an uneven film according to a preferred embodiment of the present invention. Schematic cross-sectional view of the manufacturing apparatus for the uneven film shown in FIG. The schematic perspective view which shows the mechanism which controls a spot supply position and the spot supply amount in the manufacturing apparatus of the uneven | corrugated film shown in FIG. (A) is a schematic perspective view which expands and shows a part of uneven film, (b) is a schematic sectional drawing which expands and shows a part of uneven film Schematic cross-sectional view showing a conventional manufacturing apparatus for uneven film Schematic cross-sectional view showing another example of a conventional uneven film manufacturing apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Uneven film 2 Film base material 3 Resin layer 5 Roll intaglio 6 Curable resin liquid 6a Spot supplied curable resin liquid 7 Nozzle 8 Nip roll 9 Liquid pool (meniscus)
DESCRIPTION OF SYMBOLS 11 Irradiation device 12 Peeling roll 21 Dispenser 22 Resin liquid supply pipe 23 Pump 25 Linear motion guide 26 Motor 28 Camera 29 Control device 31 Defect 33 Monitor

Claims (4)

  A step of supplying a curable resin liquid with a constant width to a roll intaglio plate having a concavo-convex shape on the outer peripheral surface, and a nip roll supplying a film base material around the outer surface of the roll intaglio plate coated with the curable resin liquid. A step of pressing, a step of spot-feeding a curable resin liquid to a region on the surface of the intaglio plate between the nozzle and the nip roll and to which the resin liquid is to be replenished in the coating width direction, and a film substrate downstream of the nip roll. A method for producing a concavo-convex film, comprising: a step of curing a curable resin liquid on the surface of a rolled intaglio plate; and a step of peeling the film substrate from the roll intaglio together with a curable resin bonded and cured.   Further, a step of detecting a defect by inspecting the curable resin layer adhered to the film base material peeled off from the roll intaglio, and a spot supply position of the curable resin liquid in the coating width direction based on the detection result And a step of controlling the spot supply amount. The method for producing a concavo-convex film according to claim 1.   A roll intaglio having an uneven shape on the outer peripheral surface, a nozzle for supplying a curable resin liquid to the roll intaglio with a constant width, a film base material supplying means for supplying a film base material to the outer peripheral surface of the roll intaglio, and curing A nip roll that presses the film substrate around the outer surface of the roll intaglio plate coated with the curable resin liquid, and a spot of the curable resin liquid in a partial region in the application width direction of the outer surface of the roll intaglio between the nozzle and the nip roll. A dispenser to be supplied, an irradiation device for irradiating radiation toward the roll intaglio so as to cure the curable resin liquid on the outer peripheral surface of the roll intaglio, and a curable resin bonded and cured to the film substrate An apparatus for producing a concavo-convex film, comprising transport means for peeling and transporting from the roll intaglio.   Further, a camera for photographing the surface of the curable resin layer that is provided in the conveyance path of the film base material peeled off from the roll intaglio and is adhered to the film base material, and a signal from the camera is subjected to image processing and the image processing A control device that detects a defect on the surface of the curable resin layer, controls a position in the application width direction of the dispenser, and controls a spot supply amount by the dispenser based on the detection result. 3. An apparatus for producing an uneven film according to 3.

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