JP5712733B2 - Microstructure transfer film manufacturing method and manufacturing apparatus - Google Patents

Description

  The present invention relates to a method and an apparatus for producing a microstructure transfer film by transferring a fine concavo-convex pattern structure onto the surface of a thermoplastic film. The microstructure transfer film obtained by this method is used as a member that requires micron-sized to nano-sized microstructures on its surface, such as optical films having optical functions such as diffusion, light collection, reflection, and transmission. It is done.

  As a method for producing an optical film used for an optical film such as a prism sheet, a light diffusion sheet, or a lens sheet, the film is pressed against the surface of a belt-shaped mold having a fine uneven pattern formed on the surface, and the film There is a method of transferring a fine concavo-convex pattern of a mold onto the surface of the mold. A method or apparatus that can be applied to a film made of a long thermoplastic material and that is continuously processed from unwinding through a transfer process to winding is proposed.

  After applying a die made of an endless belt having a fine structure formed on the surface to Patent Document 1 and pressing a film made of a thermoplastic resin on the heated die to form a fine concavo-convex structure on the film surface, A method for peeling the film after cooling the mold is described. The mold is heated and cooled by bringing the endless belt mold into contact with the heating roll and the cooling roll, and the fine structure is transferred to the film between the heating roll and the nip roll facing the heating roll. It is carried out by sandwiching a mold made of an endless belt and a film. In this structure, the temperature at the time of transfer and the temperature at the time of peeling can be controlled independently, so even if the mold temperature at the time of transfer is set high, the releasability does not become a problem. Transcription is possible.

JP 2008-260268 A

  However, when the method for producing a microstructure transfer film described in Patent Document 1 is used, there is a problem that a thin film (100 μm or less) is wrinkled before pressure molding, and a pattern cannot be transferred uniformly over the entire width. there were. The reason for wrinkles is that the film tends to cause thermal elongation due to a rapid temperature rise at the pressure forming portion, whereas the elongation is constrained at the nip portion. In particular, a thin film has small rigidity and tends to wrinkle. Furthermore, wrinkles are often broken at the nip portion, and are often left on the surface of the film after transfer as wrinkle marks. In addition, in the case of a thin film, the non-molded surface tends to become high temperature due to heat conduction in the pressure-molded part, but when the non-molded surface such as a nip roll is in direct contact with the non-molded surface, There was a problem that the unevenness was transferred and the quality of the product was lowered.

  An object of the present invention is to eliminate the above-mentioned problem, and press a mold made of an endless belt having a microstructure formed on the surface of a film made of a thermoplastic resin so that the microstructure is continuously applied to the surface of the film. In the manufacturing method and manufacturing equipment for fine structure transfer film to be transferred to the film, high-quality and uniform high-precision pattern shape in the width direction is continuously applied to the film with low rigidity and easy to wrinkle. It is an object to provide a manufacturing method and a manufacturing apparatus of a fine structure transfer film that can be transferred to a film.

The present invention
A mold heating step in which an endless belt-shaped mold having a microstructure formed on the surface is heated while being held in a heated heating roll; and
In a state where the transfer side surface of the molding film and the fine structure surface of the mold are in close contact with each other, the heating roll and a nip roll that is arranged in parallel with the heating roll and whose surface is covered with an elastic body are configured. A pressure transfer step of nip pressing with a pair of rolls,
A transporting step of transporting the pressed mold and the molding film to the cooling zone while keeping them in close contact with each other;
A mold cooling step of cooling from the mold side while keeping the mold and the film in close contact in the cooling zone;
A peeling step of peeling the mold after cooling and the molding film;
Is a method for producing a microstructure transfer film that transfers the microstructure formed on the surface of the mold to the surface of the heated molding film,
In the pressure transfer step, the transport step, the mold cooling step, and the peeling step, a state in which a protective film is laminated on a surface opposite to the transfer side surface of the molding film is used. A method for producing a feature-structured microstructure transfer film.

Or, an endless belt-shaped mold with a fine structure formed on the surface,
A heating roll for heating the mold, are arranged parallel to the heating roll, the surface comprising at least a nip roll covered with an elastic body, and a clamping means with the nip roll and the heating roll pressure Pressure mechanism,
A cooling roll for cooling the mold,
A mold release means for peeling off the molding film adhered to the mold;
A conveying means for conveying the mold by rotating the heating roll and the cooling roll;
Film laminating means for laminating a forming film and a protective film on the upstream side in the transport direction from the pressurizing mechanism;
Laminated film peeling means for peeling the molding film and the protective film on the downstream side in the transport direction from the mold release means,
It is the manufacturing apparatus of the fine structure transfer film characterized by including.

  According to the present invention, a microstructure transfer film for continuously transferring a microstructure to the surface of a film by pressing a mold made of an endless belt having a microstructure formed on the surface of a film made of a thermoplastic resin. In a method and a manufacturing apparatus, by supplying a molding film to a pressure transfer unit in a state where a protective film is laminated on a film having a small rigidity and being easily wrinkled, such as a thin thickness, It is possible to prevent wrinkling of the film and to transfer the shape uniformly and accurately in the width direction. In addition, since the non-molded surface of the molding film does not directly contact the pressure member, the quality of the non-molded surface is improved.

It is the schematic which looked at one Embodiment of the microstructure transfer film manufacturing apparatus to which this invention was applied from the film width direction for shaping | molding. In one Embodiment of the microstructure transfer film manufacturing apparatus to which this invention is applied, it is the schematic which looked at the structure of the pressure transfer part from the conveyance direction of the film for shaping | molding. It is the schematic for showing the deformation amount of the elastic layer of the nip roll surface in one Embodiment of this invention. In one Embodiment of the microstructure transfer film manufacturing apparatus to which this invention is applied, it is the schematic which looked at the structure of the pressure transfer part from the conveyance direction of the film for shaping | molding. In one Embodiment of the microstructure transfer film manufacturing apparatus to which this invention is applied, it is the schematic which looked at the structure of the pressure transfer part from the conveyance direction of the film for shaping | molding. In one Embodiment of the microstructure transfer film manufacturing apparatus to which this invention is applied, it is the schematic which looked at the structure of the pressure transfer part from the conveyance direction of the film for shaping | molding. It is the image observed with the scanning electron microscope of the cross section of the shape | molded film. It is a diameter distribution of a heating roll. It is the image observed with the scanning electron microscope of the cross section of the shape | molded film.

An apparatus for producing a microstructure transfer film according to the present invention includes an endless belt-shaped mold having a microstructure formed on a surface, a heating roll for heating the mold, and a heating roll. a nip roll covered with an elastic body, and a pressing mechanism having at least a clamping means with the nip roll and the heating roll, a cooling roll for cooling the mold, molding in close contact with the mold A mold release means for peeling the film for use, a conveyance means for rotating the heating roll and the cooling roll to convey the mold, a molding film and a protective film on the upstream side in the conveyance direction with respect to the pressurizing mechanism, And a laminated film peeling means for peeling the forming film and the protective film on the downstream side in the transport direction from the mold releasing means. It is intended.

  In FIG. 1, the schematic sectional drawing which looked at the manufacturing apparatus 1 of the microstructure transfer film which shows an example of embodiment of this invention from the film width direction for shaping | molding is shown.

  As shown in FIG. 1, the microstructure transfer film manufacturing apparatus 1 of the present invention includes a die 3 having the endless belt shape, a heating roll 4 and a cooling roll 5 that suspends the die 3, and a heating roll. 4, a nip roll 6 that press-molds the molding film 2 and a peeling roll 7 that is a releasing means for peeling the film after molding from the mold 3. At least one of the heating roll 4 and the nip roll 6 is connected to the pressing means 14 in order to sandwich and press the mold 3, the molding film 2, and the protective film 20 with both rolls. It is configured as a pressure mechanism. Moreover, the drive part which rotationally drives the heating roll 4 and / or the cooling roll 5 is provided as a conveyance means for conveying so that the metal mold | die 3 suspended by the heating roll 4 and the cooling roll 5 may circulate. In addition, it is provided with an unwinding roll 9 and a winding roll 10 for unwinding and winding the forming film, and further includes one or a plurality of guide rolls so as to fit the conveying path of the forming film 2. Yes. And after pinching with the nip roll 6 and the heating roll 4, the protective film 20 is laminated | stacked on the non-transfer side surface 2b of the shaping | molding film 2 between releasing the shaping | molding film 2 and the metal mold | die 3 with the peeling roll 7. Therefore, a protective laminating device 21 is provided on the upstream side in the conveying direction from the nip portion, and a protective film peeling device 22 for peeling the protective film from the molding film 2 is provided downstream of the peeling roll 7 in the conveying direction. Prepare for.

  A series of molding operations by the microstructure transfer film manufacturing apparatus 1 is as follows. The molding film 2 unwound from the unwinding roll 9 is brought into a state in which the protective film 20 is laminated on the non-transfer side surface 2b of the molding film by the protective film laminating device 21, and is placed on the mold 3 heated by the heating roll 4. Supply. The molding film 2 laminated with the mold 3 is pressed against the surface 3a on which the microstructure of the mold 3 is processed by the nip roll 6, and corresponds to the shape of the surface of the mold 3 on the transfer side surface 2a of the molding film. A fine structure having a pattern opposite to the fine structure of the mold 3 is transferred and molded. Thereafter, the molding film 2 is conveyed to the outer surface of the cooling roll 5 in a state where the mold 3 is in close contact with the transfer side surface 2a and in a state where the protective film 20 is in close contact with the non-transfer side surface. The molding film 2 is cooled by heat conduction through the mold 3 by the cooling roll 5 and then peeled from the molding film 2 by the peeling roll 7. Next, the protective film laminated on the non-transfer surface 2b of the molding film 2 peeled off from the mold is peeled off by the protective film peeling device 22 and then wound around the take-up roll 10. The above operation is continuously performed.

  With the above apparatus configuration and operation, the molding film 2 can be pressed against the mold with the protective film 20 laminated on the non-molding surface side. The film for molding 2 suddenly rises in temperature due to heat transfer from the heating roll at the nip portion where the mold is pressed, and tries to cause thermal elongation. On the other hand, at the nip portion, the molding film is subjected to pressure and the deformation in the width direction is restricted, so that there is a concern that wrinkles may occur on the molding film. In particular, a thin film having a thickness of 100 μm or less is likely to wrinkle because it has a small heat capacity, a large temperature rise and a small rigidity. On the other hand, by laminating the protective film as in the present invention, the thermal elongation of the molding film itself is suppressed. This is because heat is transmitted from the non-molding surface side of the molding film to the protective film, and the temperature rise is suppressed on the non-molding surface side of the molding film. Since the molding film only needs to have a high temperature only in the fine structure transfer region in contact with the surface mold, the transfer performance is not significantly affected even if the temperature rise in the film or on the non-molded surface side is suppressed. Further, by laminating the molding film and the protective film, the apparent thickness is improved and the rigidity is increased as compared with the case of the molding film alone, so that wrinkles at the nip portion can be suppressed.

  In addition, as described above, the non-molding surface side of the molding film is prevented from rising in temperature by heat escaping to the protective film, and is not directly in contact with the nip roll surface. The shape of the surface is not transferred, leading to improved product quality. In particular, for optical films and the like used for displays and the like, the surface state on the non-molded surface side may greatly affect the performance of the product, and the quality on the non-molded surface side is important.

Below, each structural member is demonstrated. In the protective film laminating apparatus 21, an air cylinder is attached to an end in the longitudinal direction of the roll so that the laminating roll 23 and the nip roll 24 can be separated from each other with the pass line of the molding film 2 and the pass line of the protective film 20 in between. The nip pressure is controlled by the air supply pressure to the air cylinder. The laminating roll 23 may be connected to a driving means so that it can be laminated at a predetermined speed, or may be rotated at the same peripheral speed in synchronism with the driving means for driving the heating roll 4 on the downstream side in the conveying direction. You may comprise. As a means for synchronizing, it is preferable to mechanically connect using a gear, a belt, or the like, or to connect the servo motor to the end of each rotating shaft and perform synchronous control so that the rotation amount is the same.
Moreover, if the surface of the laminate roll 23 or the nip roll 24 is made of a rubber material having a certain elasticity and adhesiveness, the effect of uniformly laminating the protective film 20 over the entire width while excluding air or the like is enhanced. For example, the rubber hardness (JIS K6253 revised year 2006) is preferably 50 to 90 °, more preferably 60 to 80 °, and the surface center line average roughness (JIS B0601 revised year 2001) is preferably 0.1 μm to A range of 1.0 μm is preferable. Suitable materials include EPDM (ethylene propylene diene rubber), silicone rubber, fluorine rubber and the like. When the rubber hardness of each roll is greater than 90 or the center line average roughness is greater than 1 μm, the adhesiveness between the protective film and the roll is not sufficient, and therefore, between the base film and the protective film as the molding film. In some cases, air may be entrapped and uniform lamination may be difficult. On the other hand, when the rubber hardness is less than 50, since the rubber deformation during the laminating operation is large, the protective film is not laminated with sufficient force, which may cause a problem in that the adhesion force is lowered. In addition, although the lamination linear pressure per unit length of the film width direction for shaping | molding is based also on the base material and film to be used, the range of 0.1-10 N / cm is preferable when obtaining moderate adhesive force.

  Next, an apparatus configuration of a pressure molding unit in which the molding film 2 and the protective film 20 are sandwiched between the heating roll 4 and the nip roll 6 paired with the heating roll 4 will be described with reference to the drawings.

  FIG. 2 shows a structure in which a forming film 2 is pressed against a mold 3 by a heating roll 4 and a nip roll 6 facing the heating roll 4 in a microstructure transfer film manufacturing apparatus to which the present invention is applied. It is the schematic diagram seen from the conveyance direction.

  The nip roll 6 has a structure in which the outer surface of the core layer is covered with an elastic layer 11. The core layer is required to have strength and processing accuracy. For example, steel, fiber reinforced resin, ceramics, aluminum alloy or the like is applied. The elastic layer 11 is a layer that is deformed by a pressing force, and a resin layer represented by rubber or an elastomer material is preferably applied. The core layer is rotatably supported by bearings 13 at both ends thereof, and the bearing 13 in FIG. 3 is connected to pressing means 14 such as a cylinder. The nip roll 6 is opened and closed by the stroke of the pressing means 14 to clamp or release the molding film 2.

  Further, the nip roll 6 may have a temperature adjustment mechanism in accordance with a desired process and film material. The temperature control mechanism is a structure that heats from the inside of the roll by hollowing the inside of the roll and embedding a cartridge heater or induction heating device, or by processing a flow path in the inside and flowing a heat medium such as oil, water, or steam But it ’s okay. Further, an infrared heater may be installed near the outer surface of the roll and heated from the outer surface of the roll.

  The processing accuracy of the nip roll 6 is preferably 0.03 mm or less in the cylindricity tolerance defined in JIS B 0621 (revised year 1984) and 0.03 mm or less in the circumferential runout tolerance. If these values become too large, there will be a partial gap between the heating roll 4 and the nip roll 6 at the time of clamping, so that the molding film 2 cannot be pressed with a uniform force in the width direction. Transfer unevenness may occur on the transfer-side surface 2a. The surface roughness of the elastic layer 11 is preferably one having an arithmetic average roughness Ra of 1.6 μm or less as defined in JIS B 0601 (revised year 2001). This is because when the Ra exceeds 1.6 μm, the surface shape of the elastic layer 11 may be transferred to the back surface of the molding film 2 during pressing.

  The heat resistance of the elastic layer 11 of the nip roll 6 is preferably one having a heat resistance temperature of 160 ° C. or higher, more preferably one having a heat resistance temperature of 180 ° C. or higher. Here, the heat resistant temperature refers to the temperature at which the rate of change in tensile strength when left at that temperature for 24 hours exceeds 10%.

  As the material of the elastic layer 11, for example, when rubber is used, silicone rubber, EPDM, neoprene, CSM (chlorosulfonated polyethylene rubber), urethane rubber, NBR (nitrile rubber), ebonite, or the like can be used. When seeking higher elastic modulus and hardness, use a special prescription for the rubber from the rubber manufacturers as a resin for calender rollers, or use a hard pressure resistant resin (eg polyester resin) with improved toughness. Can do.

  FIG. 3 is a schematic view of the nip roll 6 taken out when the pressing force is applied and viewed from the width direction of the forming film 2. At this time, a deformation amount δ is generated in the thickness direction of the elastic layer 11, and accordingly, the nip roll 6 and the forming film 2 are in contact with each other with a contact width B. In order to control the deformation amount δ of the elastic layer 11, the rubber hardness of the elastic layer 11 is preferably in the range of 70 to 97 ° in accordance with ASTM D2240: 2005 (Shore D) standard. This is because when the hardness is less than 70 °, the amount of deformation δ of the elastic layer 11 increases, the contact width B with the molding film 2 becomes too large, and it becomes impossible to ensure the pressure necessary for transferring the fine structure. If the hardness exceeds 97 °, the deformation amount δ of the layer is decreased, and the contact width B is too small, so that the pressing time necessary for transferring the fine structure may not be secured. It is.

  Next, the heating roll 4 facing the nip roll 6 and the mold 3 will be described. Since the heating roll 4 receives a load at the time of nip, strength and processing accuracy are required, and further includes heating means. Examples of the material include steel, fiber reinforced resin, ceramics, and aluminum alloy. Also, as a heating means, a structure that heats from the inside of the roll by hollowing the inside and installing a cartridge heater or an induction heating device, or processing a flow path inside and flowing a heat medium such as oil, water, or steam But it ’s okay. Further, an infrared heater or induction heating device may be installed near the outer surface of the roll and heated from the outer surface of the roll.

  The processing accuracy of the heating roll 4 may be 0.03 mm or less in the cylindricity tolerance defined in JIS B 0621 (revision year 1984) and 0.03 mm or less in the circumferential runout tolerance as in the nip roll 6 described above. preferable. If these values are too large, a partial gap is formed between the heating roll 4 and the nip roll 6 at the time of clamping, so that the molding film 2 cannot be pressed uniformly, and the transfer-side surface 2a of the molding film 2 is lost. Transfer unevenness may occur. Moreover, the surface roughness of the heating roll 4 is preferably 0.2 μm or less in terms of arithmetic average roughness Ra as defined in JIS B 0601 (revised year 2001). This is because if the Ra exceeds 0.2 μm, the shape of the heating roll 4 is transferred to the back surface of the mold 3, which may be transferred to the fine structure surface 2 a of the molding film 2.

The surface of the heating roll 4 is preferably subjected to a treatment for forming a hard coating such as hard chrome plating, ceramic spraying, diamond-like carbon coating, or the like. Because the heating roll 4 is always in contact with the mold 3 and is subjected to a pressing force by the nip roll 6, the surface thereof is very easily worn, and the surface of the heating roll 4 is worn or scratched. This is because problems such as uneven transfer of the film as described above and transfer of the roll surface shape onto the film occur.
Further, it is preferable to gradually reduce the pressure toward the end in the width direction of the pressurizing unit. By applying a pressure gradient in the width direction, both the forming film 2 and the protective film 20 are less likely to be wrinkled in the transport direction, so that air accumulation is less likely to occur at the interface between the two films after transfer. As a result, transfer unevenness due to wrinkles and air accumulation at the interface can be suppressed.

  As a preferable pressure distribution, it is preferable that the pressure decreases monotonously from the center toward the end without having a minimum point of pressure from the center toward the end. Monotonically decreasing means that the rate decreases while the rate of decrease may fluctuate. Here, the reduction rate is the absolute value of the pressure change amount per 1 cm. More preferably, the decreasing rate increases from the center toward the end. By having such a pressure distribution, when pressure is applied at the pressure transfer section, the air layer between the molding film and the protective film is easily discharged, and wrinkles can be suppressed. The amount of pressure decrease is approximately 1 to 10 MPa / m between the center portion and the end portion in the pressing surface width direction.

  FIG. 4 is a schematic diagram showing an apparatus configuration of the pressure forming unit when the diameter of the heating roll 4 is gradually reduced from the central part toward the end part in the pressing part. The amount of deformation of the elastic layer 11 decreases as it goes outward in the width direction of the pressing part, and accordingly, the pressure applied to the forming film 2 also decreases as it goes toward the end of the pressing part in the width direction. As a result, the pressure applied to the region located outside in the width direction from the mold 3 of the molding film 2 is reduced, and wrinkles during transfer and air accumulation at the interface can be suppressed.

  The diameter to be changed is designed to be the above-described pressure reduction amount. This depends on the thickness and mechanical characteristics of the elastic layer 11, and is in the range of 0.1 to 1 mm / m when an elastic layer made of rubber having a thickness of 10 to 20 mm and a hardness of Shore D 90 ° is applied. Is preferably applicable.

  FIG. 5 shows a structure in which the diameter of the pressing portion of the nip roll 6 is reduced from the center in the width direction toward the end. It is preferable that the diameter of the core material is changed, and the thickness of the elastic body on the outer surface is the same over the entire width of the pressure unit. The pressure distribution when pressurized is determined by the amount of change in the thickness of the elastic body. By changing the diameter of the core material and making the thickness of the elastic body the same, the amount of change in the thickness of the elastic body when pressurized is the largest at the center in the width direction as shown in FIG. As a result, the pressure distribution in the width direction has the highest pressure at the center and the lowest at the end.

  A preferable change in the diameter distribution of the nip roll is designed to be the above-described pressure reduction amount. This depends on the thickness and mechanical characteristics of the elastic layer 11, and is in the range of 0.1 to 1 mm / m when an elastic layer made of rubber having a thickness of 10 to 20 mm and a hardness of Shore D 90 ° is applied. Is preferably applicable.

  FIG. 6 shows a structure in which the thickness of the mold 3 is gradually reduced from the central part of the pressure toward the outside in the width direction. The thickness distribution of the pressurizing part of the mold is preferably the thickest at the central part and the thinnest at the end of the pressurizing part. The change in the width direction of the mold thickness appears as a change in the thickness of the elastic body when pressed. Therefore, as shown in FIG. 6, the amount of change in the thickness of the elastic body when pressurized is the largest at the center and the smallest at the end, and as a result, the pressure distribution in the width direction is the highest in the center. It becomes higher and can be the smallest at the end.

  The preferable thickness distribution of the mold may be designed so that the above-described pressure decrease amount is obtained. However, since the appropriate total thickness of the mold is 0.3 mm or less, 0.1 to 0.15 mm / m. The range of is preferably applied.

The relative positional accuracy between the heating roll 4 and the nip roll 6 is preferably 0.1 mm or less in the parallelism tolerance defined in JIS B 0621 (revised year 1984). When the parallelism tolerance exceeds 0.1 mm, the pressing force applied to the forming film 2 is not uniform in the width direction or the pressure distribution as designed, and transfer unevenness or film meandering occurs. There is a case.
The total amount of deflection when both rolls are pressed is preferably 50 μm or less, more preferably 30 μm or less, in the width direction length W of the mold. When the amount of deflection exceeds 50 μm, the elastic layer 11 of the nip roll 6 cannot follow the deformation and the pressing force applied to the forming film 2 becomes non-uniform.

  As shown in FIGS. 2 to 3, the preferred nip pressure is a force P applied to the nip roll 6 by the pressing means 14, a contact length B between the molding film 2 and the nip roll 6, and a width direction length W of the mold 3. In some cases, the apparent nip pressure σ defined by σ = P / (B × W) is preferably 80 MPa or more, and more preferably 100 MPa or more. Further, the pressing distance of the elastic layer 11, that is, the contact length B is preferably in the range of 4 to 8 mm, more preferably in the range of 5 to 7 mm. When the contact length B is less than 4 mm, it is not possible to ensure a sufficient pressing time for transferring the fine structure to the molding film 2. On the other hand, if it becomes wider than 8 mm, it becomes difficult to ensure the above-mentioned nip pressure with a sufficient value.

  The mold 3 is an endless belt whose surface has a fine structure.

  The material is preferably a metal having high strength and thermal conductivity, such as nickel, steel, stainless steel, or copper. Moreover, you may use what gave the surface of said metal belt.

  Regarding the method of creating the mold 3 having a fine structure on the surface, a method of directly cutting or laser processing on the surface of the metal belt, a method of directly cutting or laser processing on the plating film formed on the surface of the metal belt, Examples thereof include a method of electrocasting a cylindrical original plate having a fine structure on the inner surface, and a method of continuously attaching a thin plate having a fine structure surface to the surface of a metal belt.

  An endless metal belt is a method in which the ends of metal plates having a predetermined thickness and length are butt welded, and a metal plate having a predetermined double thickness is welded to a predetermined half length to make it endless. It is manufactured by a method of rolling later. At this time, the thickness is preferably in the range of 0.1 to 0.3 mm due to the strength of the metal belt and the handling property. If the thickness is smaller than this range, the metal belt may be broken or plastically deformed by the tension applied when suspended by the heating roll 4 and the cooling roll 5. On the other hand, when the thickness is larger than this range, the bending rigidity of the metal belt becomes too large, and it becomes difficult to suspend the belt on the heating roll 4 and the cooling roll 5 or to carry it while being suspended on these rolls.

When plating the surface of the endless metal belt, the material of the plating is preferably nickel or copper. The thickness of the plating is preferably in the range of 0.03 to 0.1 mm. If the thickness of the plating is larger than the thickness of the metal belt, peeling may occur at the interface between the metal belt and the plating. On the other hand, if the thickness of the plating is too small, it becomes difficult to process the fine structure with high accuracy.
An example of the manufacturing method of the endless belt mold is shown below.

  First, an end portion of a stainless steel plate preferably having a thickness of 0.3 mm or less and a length of 1000 mm or more is butt-welded and processed into an endless metal belt. Subsequently, the metal belt is fixed to a jig for plating, and nickel plating with a thickness of preferably 0.1 mm or less is applied to the outer surface. Thereafter, the plated metal belt is fitted into a processing jig roll, and a predetermined fine structure is cut into the plated layer of the metal belt by a lathe machine.

  The fine structure indicates a shape in which a convex shape having a height of 10 nm to 1 mm is periodically repeated with a convex shape having a pitch of 1 μm to 100 μm, more preferably a pitch of 1 μm to 100 μm, A plurality of triangular grooves may be arranged in stripes, or may be rectangular, semicircular or semielliptical. Furthermore, the groove does not have to be a straight line, and may be a curved stripe pattern. The ridge line direction is not limited to the circumferential direction of the belt, and may be the width direction. Furthermore, the fine structure is not limited to a continuous linear shape or curved shape, and may be a convex shape such as a hemisphere, a cone, or a rectangular parallelepiped, or a concave shape that is discretely arranged in a dot shape.

  The cooling roll 5 is preferably cooled, for example, by a water-cooled cooling means that is provided with a water passage inside and continuously circulates water having a constant temperature. Then, the mold 3 is cooled by heat conduction at the contact surface with the mold 3.

The end of each roll is rotatably supported by a rolling bearing or the like. The heating roll 4 is connected to driving means such as a motor, and is rotatable while controlling the speed. The cooling roll 5 is preferably rotated by the driving force of the heating roll 4 through a belt mold. If the speed is preferably in the range of 1 to 30 m / min, the productivity can be increased while the microstructure is transferred with high accuracy. However, the balance between the moldability of the microstructure and the productivity of the molded film is balanced. In consideration, it is more preferable that the speed is in the range of 10 to 20 m / min. The driving means of the nip roll 6 is connected to the end of the heating roll 4 with a chain or a belt, and can be rotated in conjunction with the heating roll 4 or a motor capable of synchronizing the speed with the heating roll 4 is used. However, it may be rotated independently and may be rotated by friction with the forming film 2.
Both the unwinding roll 9 and the winding roll 10 have a structure capable of fixing a core around which the forming film 2 is wound, and the end portion is connected to a driving means such as a motor and can be rotated while controlling the speed. Yes. Moreover, it is preferable that the tension applied to the molding film 2 can be adjusted by torque control.

  Like the cooling roll 6, the peeling roll 7 has a built-in cooling means, and cools the molding film 2 from the back surface side, and plays a role of assisting the peeling from the mold 3. The pressing force of the peeling roll 7 against the molding film 2 is not particularly limited as long as the peripheral surface of the peeling roll 7 is in close contact with the back surface of the molding film 2.

The manufacturing method of the film in which the fine structure was formed on the surface using said apparatus is demonstrated.
The method for producing a microstructure transfer film of the present invention includes a mold heating step in which an endless belt-shaped mold having a microstructure formed on the surface is heated while being held in a heated heating roll, and a transfer of the molding film. In a state where the side surface and the microstructure surface of the mold are in close contact with each other, the heating roll and a pair of rolls that are arranged in parallel to the heating roll and the surface is covered with an elastic body , A pressure transfer process for pressurizing the nip, a transporting process for transporting the pressed mold and the molding film to the cooling zone in close contact, and a mold with the mold and the film in close contact with each other in the cooling zone. The microstructure formed on the surface of the mold is heated by including at least a mold cooling process for cooling from the mold side and a peeling process for peeling the cooled mold and the molding film. A method for producing a microstructure transfer film for producing a microstructure transfer film by transferring to a surface of a molding film, wherein the pressure transfer step, the transport step, the mold cooling step, and the peeling step In this embodiment, a protective film is laminated on the surface opposite to the transfer-side surface of the molding film.

  The molding film to be applied is a molding film containing a thermoplastic resin as a main component, and specifically, preferably a polyester-based resin such as polyethylene terephthalate, polyethylene-2, 6-naphthalate, polypropylene terephthalate, and polybutylene terephthalate. Polyolefin resins such as polyethylene, polystyrene, polypropylene, polyisobutylene, polybutene, polymethylpentene, polyamide resins, polyimide resins, polyether resins, polyesteramide resins, polyetherester resins, acrylic resins, polyurethane Resin, polycarbonate resin, or polyvinyl chloride resin. Among these, there are various types of monomers to be copolymerized, and it is particularly easy to adjust material properties, so that polyester resins, polyolefin resins, polyamide resins, acrylic resins, or mixtures thereof are used. It is preferable that the thermoplastic resin is mainly formed from the selected thermoplastic resin, and it is more preferable that the above-mentioned thermoplastic resin is 50% by weight or more.

  The molding film 2 may be a film made of the above-mentioned resin alone or a laminate made of a plurality of resin layers. In this case, compared with a single film, surface characteristics such as slipperiness and friction resistance, mechanical strength, and heat resistance can be imparted. Thus, when it is a laminate composed of a plurality of resin layers, it is preferable that the entire film satisfies the requirement that the above-mentioned thermoplastic resin is the main component, but the entire film does not satisfy the requirement, If a layer satisfying at least the above requirements is formed on the surface layer, the surface can be easily formed. In particular, when it is desired to increase the mold temperature in order to improve the moldability of the film, the surface layer is a resin having a low glass transition point and easy to transfer a fine structure, and the core layer is a resin having a high glass transition point and high strength. By using a film having a configuration, it is possible to improve the moldability of the film while maintaining the flatness of the film.

  Moreover, it is preferable that it is the range of 10-100 micrometers as preferable thickness (thickness, film thickness) of the film for shaping | molding applied to this invention. If the thickness is less than 10 μm, the thickness is not sufficient for molding. If the thickness exceeds 100 μm, the film has sufficient rigidity, and continuous transfer is possible even without a protective film. In particular, in a molding film having a thickness of 50 μm or less, wrinkles are likely to occur due to insufficient film rigidity in the mold release conveyance process, so that the apparatus and method of the present invention described above are effective for suppressing wrinkles during transfer.

  Further, the protective film applied to the present invention is a two-layer laminate of an adhesive layer and a base material layer configured such that the adhesive layer is laminated on all or part of the surface with which the molding film contacts. It is done. In addition to the two-layer laminate, other layers may be included.

Examples of the base material layer include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene film, polypropylene film, cellophane, diacetyl cellulose film, triacetyl cellulose film, acetyl cellulose butyrate film, polyvinyl chloride film, and polychlorinated chloride. Vinylidene film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polysulfone film, polyetheretherketone film, polyethersulfone film, polyetherimide film, polyimide film, fluorine Resin film, nylon film, acrylic resin film, etc. Rukoto can.
As such an adhesive layer, an acrylic, rubber-based, or silicone-based adhesive resin can be used.

  The protective film applied to the present invention may be a self-adhesive type. In particular, it is suitable as a protective film for non-molded surfaces and relatively smooth surfaces. For example, polyester-based resins such as polyethylene terephthalate and polybutylene terephthalate, polyolefin, polyamide, polycarbonate, acrylic resin, polyvinyl chloride, paper, etc. Examples thereof include a system (linear low density polyethylene) or the like formed on the surface as an adhesive layer.

Moreover, as thickness of the protective film applied to this invention, the range of 20 micrometers-200 micrometers is preferable. When it is thinner than 20 μm, it is difficult to handle the protective film, and the effect of improving the rigidity when laminated with the molding film is small. On the other hand, when the thickness is larger than 200 μm, handling is difficult, and an increase in material cost becomes a problem.
An example of an embodiment of the present invention will be described with reference to FIGS.

  First, as a preparatory stage, the forming film 2 is pulled out from the unwinding roll 9 and is laminated on the heating roll 4 and the cooling roll 5 in a state of being laminated by the protective film laminating apparatus 21, and the peeling roll 7, It is set as the state which is winding up with the winding roll 10 through the protective film peeling apparatus 22. FIG. The protective film is pulled out from the protective film unwinding roll, and the protective film peeled off by the peeling device is wound up by the protective film winding roll 25.

  In the protective film laminating apparatus 21, it is preferable that the protective film 20 and the molding film 2 are laminated through the adhesive layer only by the non-pressurized portion 31 that is not pressurized in the pressure transfer process. This is because if an adhesive layer is present in the pressurizing part, an excessive adhesive state is formed at the interface due to pressure and heat during pressurization. An excessive adhesive state eliminates air escape at the interface between the two films during pressurization, and may cause transfer unevenness due to local air accumulation. Further, since a large force is required when the protective film is peeled off, the molding film may be deformed. On the other hand, if there is no adhesive part between the protective film and the molding film over the entire width, the two films may slide at the interface, which may cause meandering and wrinkling.

  Subsequently, while the molding film 2 is conveyed at a low speed by the driving means, the heating means of the heating roll 4 and the cooling means of the cooling roll 5 are operated, and the surface temperature of the heating roll 4 and the cooling roll 5 becomes a predetermined temperature. Adjust the temperature until. The conditions of the surface temperature of the heating roll 4 and the surface temperature of the cooling roll 5 depend on the material of the molding film 2, the shape of the microstructure of the mold 3, the aspect ratio, etc., and the surface temperature of the heating roll 4 is 180-250. The surface temperature of the cooling roll 5 is set at 20 to 80 ° C. Moreover, it is preferable that the conveyance speed during temperature control shall be 0.1-5 m / min. If the surface temperature of the heating roll 4 is less than 180 ° C., the molding film at the time of molding may not be sufficiently softened and the moldability may be lowered. On the other hand, when the temperature exceeds 250 ° C., the film becomes too close to a viscous body and it is difficult to maintain the shape as a film body when the film is pressurized. When the temperature of the cooling roll exceeds 80 ° C., the film is not sufficiently solidified, and when the film is peeled off, the resin constituting the film may be cut and remain in the mold. On the other hand, if the cooling roll is less than 20 ° C., the mold is cooled more than necessary, and wasteful energy is required to heat the mold.

  When the surface temperature of the heating roll 4 and the cooling roll 5 is adjusted to the set value, the film is conveyed at the molding speed, and at the same time, the nip roll 6 is closed and the heating roll 4 and the nip roll 6 are used to form the molding film 2, the protective film 20, and the gold. The mold 3 is pressurized, and the shape of the microstructure surface 3 a of the mold 3 is transferred to the transfer side surface 2 a of the molding film 2. As conditions at this time, the film forming speed is set in the range of 1 to 30 m / min, and the nip pressure is set in the range of 80 MPa to 120 MPa.

  When the nip pressure is less than 80 Ma, when the fine structure pattern is transferred, the resin cannot be sufficiently deformed, resulting in poor molding in many cases. On the other hand, if it exceeds 120 MPa, the pattern of the mold may be deformed, and the apparatus becomes large due to the strength design, resulting in a problem of cost.

  The continuous transfer of the film is composed of a mold heating process, a pressure transfer process, a transport process, a mold cooling process, and a peeling process when the processes are arranged in accordance with the rotating operation of the mold. The mold 3 is always heated by heat conduction from the high-temperature heating roll 4 at the portion in contact with the heating roll 4, and the temperature of the mold 3 is changed to the temperature of the heating roll 4 before being sandwiched between the heating roll 4 and the nip roll 6. The temperature is raised to the surface temperature (die heating step). The molding film 2 is pressed against the mold 3 heated in the clamping part by the heating roll 4 and the nip roll 6, and the resin constituting the softened film is filled in the pattern of the microstructure surface 3 a of the mold 3. (Pressure transfer process). The film pressed against the mold 3 is conveyed to the cooling zone while being in close contact with the mold 3 (conveying step). Here, the cooling zone indicates a range where the mold 3 and the cooling roll 5 are in contact with each other. In the cooling zone, the film is cooled to the glass transition point or less of the resin constituting the film together with the mold 3 by heat conduction with the cooling roll 5 (cooling step). The film after cooling is released from the cooling roll 5 by the peeling roll 7 (peeling process). The film after peeling is wound up on a winding roll 10.

  In addition, it is preferable to reduce the pressure distribution in the pressure transfer step from the central portion in the film width direction toward the end by the configuration shown in FIGS. 4, 5, and 6. By applying a pressure gradient in the width direction, wrinkles in the conveyance direction are difficult to enter together with the forming film 2 and the protective film 20, so that air accumulation is less likely to occur at the interface between the two films after transfer. As a result, transfer unevenness due to wrinkles and air accumulation at the interface can be suppressed.

Example 1
The film for molding 2 was made of a cycloolefin polymer having a thickness of 40 μm (trade name: ZEONOR ZF14-040, manufactured by Optes Co., Ltd.), and the width was 220 mm.
A polyester film (trade name Lumirror T60, manufactured by Toray Industries, Inc.) having a thickness of 188 μm was applied to the protective film 20.
The mold 3 is formed by cutting a 0.1 mm thick nickel plating on the surface of a 0.2 mm thick stainless steel belt and cutting a V groove shape with a pitch of 24 μm and a depth of 12 μm in parallel with the circumferential direction of the belt. Created. The belt had a width of 200 mm and a circumferential length of 1200 mm.
As the heating roll 4, a cylindrical core material made of carbon steel having a hard chrome plated surface was used. The outer diameter of the central part for suspending the mold 3 of the heating roll 4 was 180 mm, and the length in the width direction was 204 mm. An infrared lamp heater was used as the heating means, and the surface temperature of the heating roll 4 was heated to 210 ° C.
As with the heating roll 4, the cooling roll 5 was made of carbon steel as a core material and hard chrome plated on the surface. The cooling roll 5 was always kept at a surface temperature of 50 ° C. by running water circulating inside.
As the nip roll 6, a surface of a cylindrical core made of carbon steel having an outer diameter of 160 mm was coated with a polyester resin (hardness: Shore D80 °) with a thickness of 20 mm as the elastic layer 11.
The pressing means 14 was loaded with a pressing force of 120 kN on the nip roll 6 using a pneumatic cylinder. At this time, when the contact width B between the nip roll 6 and the molding film 2 was confirmed using a pressure measurement film (Prescale, manufactured by Fuji Film Co., Ltd.), the total width was 6 mm, and the molding film 2 was loaded. The pressure was 100 MPa and was uniform in the width direction.
When the film transport speed was gradually increased from 1 m / min to a maximum of 30 m / min, the fine shape processed into the mold was continuously and uniformly without any wrinkles on the molding film at any speed. I was able to transcribe.
Note that almost 100% of the V-groove shape could be transferred up to 10 m / min. The result of having observed the cross section of the film after a shaping | molding at the time of 10 m / min in FIG. 7 with the scanning electron microscope is shown.

Example 2
The film for molding 2 was made of a cycloolefin polymer having a thickness of 40 μm (trade name: ZEONOR ZF14-040, manufactured by Optes Co., Ltd.), and the width was 220 mm.
A polyester film (trade name Lumirror T60, manufactured by Toray Industries, Inc.) having a thickness of 188 μm was applied to the protective film 20.
The mold 3 is formed by cutting a 0.1 mm thick nickel plating on the surface of a 0.2 mm thick stainless steel belt and cutting a V groove shape with a pitch of 24 μm and a depth of 12 μm in parallel with the circumferential direction of the belt. Created. The belt had a width of 200 mm and a circumferential length of 1200 mm.
As the heating roll 4, a cylindrical core material made of carbon steel having a hard chrome plated surface was used. The outer diameter of the central part for suspending the mold 3 of the heating roll 4 was 180 mm, and the length in the width direction was 204 mm. The diameter was 180 mm at the center of the pressurizing part, and the diameter was gradually reduced toward the end. The diameter distribution is shown in FIG.
As with the heating roll 4, the cooling roll 5 was made of carbon steel as a core material and hard chrome plated on the surface. The cooling roll 5 was always kept at a surface temperature of 50 ° C. by running water circulating inside.
As the nip roll 6, a surface of a cylindrical core made of carbon steel having an outer diameter of 160 mm was coated with a polyester resin (hardness: Shore D80 °) with a thickness of 20 mm as the elastic layer 11.
The pressing means 14 was loaded with a pressing force of 120 kN on the nip roll 6 using a pneumatic cylinder. At this time, when the contact width B between the nip roll 6 and the molding film 2 was confirmed using a pressure measurement film (Prescale, manufactured by Fuji Film Co., Ltd.), the central portion was 6.5 mm and both ends were 5.5 mm. Yes, the pressure applied to the molding film 2 was high at the center and small at the end.
When the film transport speed was gradually increased up to 1 m / min up to 30 m / min, the fine shape processed into the mold was continuously transferred without any wrinkles on the molding film at any speed. We were able to.
Note that almost 100% of the V-groove shape could be transferred up to 15 m / min. The result of having observed the cross section of the film after the shaping | molding at the time of 15 m / min in FIG. 9 with the scanning electron microscope is shown.

Example 3
The forming film 2 was made of a cycloolefin polymer having a thickness of 100 μm (trade name: Zeonore ZF14-100, manufactured by Optes Co., Ltd.), and the width was 220 mm.
A polyester film (trade name Lumirror T60, manufactured by Toray Industries, Inc.) having a thickness of 188 μm was applied to the protective film 20.
The mold 3 is formed by cutting a 0.1 mm thick nickel plating on the surface of a 0.2 mm thick stainless steel belt and cutting a V groove shape with a pitch of 24 μm and a depth of 12 μm in parallel with the circumferential direction of the belt. Created. The belt had a width of 200 mm and a circumferential length of 1200 mm.
As the heating roll 4, a cylindrical core material made of carbon steel having a hard chrome plated surface was used. The outer diameter of the central part for suspending the mold 3 of the heating roll 4 was 180 mm, and the length in the width direction was 204 mm. An infrared lamp heater was used as the heating means, and the surface temperature of the heating roll 4 was heated to 210 ° C.
As with the heating roll 4, the cooling roll 5 was made of carbon steel as a core material and hard chrome plated on the surface. The cooling roll 5 was always kept at a surface temperature of 50 ° C. by running water circulating inside.
As the nip roll 6, a surface of a cylindrical core made of carbon steel having an outer diameter of 160 mm was coated with a polyester resin (hardness: Shore D80 °) with a thickness of 20 mm as the elastic layer 11.
The pressing means 14 was loaded with a pressing force of 120 kN on the nip roll 6 using a pneumatic cylinder. At this time, when the contact width B between the nip roll 6 and the molding film 2 was confirmed using a pressure measurement film (Prescale, manufactured by Fuji Film Co., Ltd.), the total width was 6.5 mm. The applied pressure was uniform in the width direction.
The film transport speed was gradually increased up to 1 m / min up to 30 m / min. Even at any speed, the molding film was not wrinkled, and the fine shape processed into the mold was continuously uniform. Could be transcribed.
Note that almost 100% of the V-groove shape could be transferred up to 10 m / min.

Comparative Example 1
The film for molding 2 was made of a cycloolefin polymer having a thickness of 40 μm (trade name: ZEONOR ZF14-040, manufactured by Optes Co., Ltd.), and the width was 220 mm.
The protective film 20 was not applied.
The mold 3 is formed by cutting a 0.1 mm thick nickel plating on the surface of a 0.2 mm thick stainless steel belt and cutting a V groove shape with a pitch of 24 μm and a depth of 12 μm in parallel with the circumferential direction of the belt. Created. The belt had a width of 200 mm and a circumferential length of 1200 mm.
As the heating roll 4, a cylindrical core material made of carbon steel having a hard chrome plated surface was used. The outer diameter of the central part for suspending the mold 3 of the heating roll 4 was 180 mm, and the length in the width direction was 204 mm.
As with the heating roll 4, the cooling roll 5 was made of carbon steel as a core material and hard chrome plated on the surface. The cooling roll 5 was always kept at a surface temperature of 50 ° C. by running water circulating inside.
As the nip roll 6, a surface of a cylindrical core made of carbon steel having an outer diameter of 160 mm was coated with a polyester resin (hardness: Shore D80 °) with a thickness of 20 mm as the elastic layer 11.
The pressing means 14 was loaded with a pressing force of 120 kN on the nip roll 6 using a pneumatic cylinder. At this time, when the contact width B between the nip roll 6 and the molding film 2 was confirmed using a pressure measurement film (Prescale, manufactured by Fuji Film Co., Ltd.), the total width was 5.5 mm. The applied pressure was uniform in the width direction.
When the film transport speed was gradually increased from 1 m / min to a maximum of 30 m / min, the molding film was wrinkled at any speed, the film was broken, and the fine shape could be transferred continuously. No wrinkles remained in the film after molding even in the portion without breakage.

Comparative Example 2
The forming film 2 was made of a cycloolefin polymer having a thickness of 100 μm (trade name: Zeonore ZF14-040, manufactured by Optes Co., Ltd.), and the width was 220 mm.
The protective film 20 was not applied.
The mold 3 is formed by cutting a 0.1 mm thick nickel plating on the surface of a 0.2 mm thick stainless steel belt and cutting a V groove shape with a pitch of 24 μm and a depth of 12 μm in parallel with the circumferential direction of the belt. Created. The belt had a width of 200 mm and a circumferential length of 1200 mm.
As the heating roll 4, a cylindrical core material made of carbon steel having a hard chrome plated surface was used. The outer diameter of the central part for suspending the mold 3 of the heating roll 4 was 180 mm, and the length in the width direction was 204 mm.
As with the heating roll 4, the cooling roll 5 was made of carbon steel as a core material and hard chrome plated on the surface. The cooling roll 5 was always kept at a surface temperature of 50 ° C. by flowing water circulating inside.
As the nip roll 6, a surface of a cylindrical core made of carbon steel having an outer diameter of 160 mm was coated with a polyester resin (hardness: Shore D80 °) with a thickness of 20 mm as the elastic layer 11.
The pressing means 14 was loaded with a pressing force of 120 kN on the nip roll 6 using a pneumatic cylinder. At this time, when the contact width B between the nip roll 6 and the molding film 2 was confirmed using a pressure measurement film (Prescale, manufactured by Fuji Film Co., Ltd.), the total width was 6 mm, and the molding film 2 was loaded. The pressure was uniform in the width direction.
When the film transport speed is gradually increased from 1 m / min to a maximum of 30 m / min, sometimes the film is pressed and transferred with wrinkles in the molding film, and the fine shape is transferred uniformly. The film was not folded and wrinkles remained on a part of the film after molding.

1: Microstructure transfer film manufacturing apparatus 2: Molding film 2a: Molding film transfer side surface 3: Mold 3a: Mold microstructure surface 4: Heating roll 5: Cooling roll 6: Nip roll 7: Peeling roll 9: unwinding roll 10: winding roll 11: elastic layer 13: bearing 14: pressing means 20: protective film 21: protective laminating device 22: protective film peeling device 23: laminating roll 24: nip roll 25: winding roll 31: Non-pressurized portion W: Length in width direction of endless belt mold δ: Deformation amount in thickness direction of elastic layer on nip roll surface P: Force applied to nip roll by pressing means B: For molding accompanying deformation of nip roll surface elastic layer Width of contact with film σ: Pressure applied to the film for molding at the pressure part

Claims (10)

A mold heating step in which an endless belt-shaped mold having a microstructure formed on the surface is heated while being held in a heated heating roll; and
In a state where the transfer side surface of the molding film and the fine structure surface of the mold are in close contact with each other, the heating roll and a nip roll that is arranged in parallel with the heating roll and whose surface is covered with an elastic body are configured. A pressure transfer step of nip pressing with a pair of rolls,
A transporting step of transporting the pressed mold and the molding film to the cooling zone while keeping them in close contact with each other;
A mold cooling step of cooling from the mold side while keeping the mold and the film in close contact in the cooling zone;
A peeling step of peeling the mold after cooling and the molding film;
Is a method for producing a microstructure transfer film that transfers the microstructure formed on the surface of the mold to the surface of the heated molding film,
In the pressure transfer step, the transport step, the mold cooling step, and the peeling step, a state in which a protective film is laminated on a surface opposite to the transfer side surface of the molding film is used. A method for producing a feature-structured microstructure transfer film. The thickness of the said film for shaping | molding is 10 micrometers or more and 100 micrometers or less, The manufacturing method of the microstructure transfer film of Claim 1 characterized by the above-mentioned. 3. The method for producing a microstructure transfer film according to claim 1, wherein the pressure distribution in the pressure transfer step is reduced from the center portion in the film width direction toward the end portion. 4. In the mold heating step, the mold surface temperature after heating is 180 to 250 ° C., and in the pressure transfer step, the nip pressure applied to the film is 80 MPa or more, and in the mold cooling step The method for producing a microstructure transfer film according to any one of claims 1 to 3, wherein the mold surface temperature after cooling is 20 to 80 ° C. The lamination state of the said protective film and the said film for shaping | molding is adhere | attached through the adhesion layer only in the non-pressurization part of the said pressure transfer process, The Claim 1 characterized by the above-mentioned. Manufacturing method of fine structure transfer film. An endless belt-shaped mold with a fine structure formed on the surface;
A heating roll for heating the mold, are arranged parallel to the heating roll, the surface comprising at least a nip roll covered with an elastic body, and a clamping means with the nip roll and the heating roll pressure Pressure mechanism,
A cooling roll for cooling the mold,
A mold release means for peeling off the molding film adhered to the mold;
A conveying means for conveying the mold by rotating the heating roll and the cooling roll;
Film laminating means for laminating a forming film and a protective film on the upstream side in the transport direction from the pressurizing mechanism;
Laminated film peeling means for peeling the molding film and the protective film on the downstream side in the transport direction from the mold release means,
An apparatus for producing a microstructure transfer film, comprising: The apparatus for producing a fine shape transfer film according to claim 6, wherein the rubber hardness of the elastic body on the surface of the nip roll is 70 to 97 ° according to ASTM D2240: 2005 standard. The apparatus for producing a microstructure transfer film according to claim 6 or 7, wherein in the pressurizing part of the heating roll, the diameter of the roll gradually decreases from the center in the width direction toward the outside. The apparatus for producing a microstructure transfer film according to claim 6 or 7, wherein in the pressurizing part of the nip roll, the diameter of the roll gradually decreases from the center in the width direction toward the outside. The apparatus for producing a microstructure transfer film according to claim 6 or 7, wherein in the pressurizing portion of the mold, the thickness of the mold gradually decreases from the center in the width direction toward the outside.