JP2012025151A - Transfer roller and method for producing optical sheet using transfer roller - Google Patents

Abstract

[PROBLEMS] To provide a transfer roll having a simple structure, easy to manufacture, easy to maintain, and operable with simple equipment.
A transfer roll according to the present invention is a transfer roll 1 for transferring a shape of an outer peripheral surface to a transfer object, and a substantially cylindrical main body having a concavo-convex pattern formed on the outer peripheral surface and having a hollow portion therein. And a heat medium ejecting means 10 that is disposed in the hollow portion and injects a heat medium onto the inner peripheral surface of the main body, and at least one end of the heat medium ejecting means is connected to the heat medium supply device, The hollow tube is arranged so as to extend to the inner surface of the main body 2 by injecting the heat medium supplied from the heat medium supply means in a predetermined rotation angle direction. Injecting means 14 is provided.
[Selection] Figure 1

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer roll and an optical sheet manufacturing method using the transfer roll, and more specifically, a temperature-controlled transfer roll having a roll outer peripheral surface temperature difference in the roll circumferential direction and an optical sheet using such a transfer roll. It is related with the manufacturing method.

  Temperature control transfer that can generate a temperature difference in the circumferential direction on the outer peripheral surface of the roll in order to prevent troubles such as poor peeling of the film in a transfer roll that transfers the surface shape to a long film or sheet A role has been proposed.

  As such a temperature control transfer roll, an annular medium flow path 13 is formed between the outer cylinder 3 and the inner cylinder 11, and two radiations are emitted from a further smaller-diameter cylinder 25 disposed in the center in this flow path. There has been proposed a transfer roll that generates a temperature difference in the circumferential direction on the outer peripheral surface of the roll by flowing a refrigerant from the directional medium passages 29 and 35. (Patent Document 1)

  Further, the space in the hollow outer cylinder 40 is divided into a plurality of heat medium chambers 91, 92, 93, 94 by a plurality of rolling rubber rolls 70, and the heat medium chambers 91, 92, 93, 94 are divided into heat medium chambers 91, 92, 93, 94. There is also proposed a transfer roll that distributes each of them individually (Patent Document 2).

JP 2006-256159 A JP 2008-143054 A

However, the roll described in Patent Document 1 has a triple structure including a sleeve 3, an inner cylinder 11, and a small-diameter inner cylinder 25, and each of the two radial medium passages 29 and 35 has a partition wall. Therefore, there is a problem that it is not easy to manufacture and is expensive.
In addition, since the surface member (sleeve) cannot be removed from the internal structure, there is a problem that the maintainability is poor.

On the other hand, the roll described in Patent Document 2 also has an internal structure that requires a complicated and high accuracy in which the inside of the sleeve is divided into a plurality of heat medium chambers 91, 92, 93, 94 by the rolling rubber roll 70. There is a problem that it is not easy to manufacture and is expensive.
Furthermore, there is a problem that a large-scale facility such as a hydraulic supply device is necessary.

  The present invention has been made in view of the above problems, and an object thereof is to provide a transfer roll that has a simple structure, is easy to manufacture, has good maintainability, and can be operated with simple equipment.

  Another object of the present invention is to provide an optical sheet manufacturing method using such a transfer roll.

According to the present invention,
A transfer roll for transferring an outer peripheral surface shape to a transfer object,
An uneven cylindrical pattern is formed on the outer peripheral surface, and a substantially cylindrical main body having a hollow portion inside,
A heat medium ejecting means that is disposed in the hollow portion and injects a heat medium onto the inner peripheral surface of the main body,
The heat medium ejecting means includes a hollow tube having at least one end connected to a heat medium supply device and arranged to extend from the outside of the main body to the inside of the hollow portion,
The hollow tube has a plurality of injection means for injecting the heat medium supplied from the heat medium supply means in a predetermined rotational angle direction to collide with the inner peripheral surface of the main body.
A transfer roll is provided.

  According to such a configuration, the predetermined position on the inner peripheral surface of the main body can be cooled or heated by the heat medium sprayed from the hollow tube, so that the temperature difference in the circumferential direction can be given to the cylindrical main body with a simple configuration. Can be generated.

According to another preferred embodiment of the invention,
The body is
A substantially cylindrical transfer sleeve in which the concavo-convex pattern to be transferred to the transfer object is formed on an outer peripheral surface;
A pair of end members disposed on both ends of the transfer sleeve in the axial direction and carrying the transfer sleeve and a mandrel having a plurality of beams interconnecting the pair of end members;
The heat medium ejected from the hollow tube passes between a plurality of beams and collides with the inner peripheral surface of the transfer sleeve.

  According to such a configuration, since the mandrel is responsible for the load, it is possible to make the transfer sleeve sufficiently thin, use a material having low strength and high thermal conductivity, and the like in the circumferential direction generated in the cylindrical main body. The temperature difference can be further increased.

According to another preferred embodiment of the invention,
The uneven shape is a lens portion transfer pattern.

According to another aspect of the invention,
Production of an optical sheet in which an active energy ray-curable composition placed between a transfer roll and a translucent substrate is cured by irradiating with an active energy ray to form a fine uneven shape on the translucent substrate A method,
The transfer roll is a transfer roll for transferring the shape of the outer peripheral surface to the transfer object, and has a substantially cylindrical main body having a concave-convex pattern formed on the outer peripheral surface and having a hollow portion therein, and the hollow portion is disposed in the hollow portion. And a heat medium ejecting means for injecting a heat medium onto the inner peripheral surface of the main body, the heat medium ejecting means having at least one end connected to the heat medium supply device and extending from the outside of the main body to the inside of the hollow portion. A plurality of injections that inject the heat medium supplied from the heat medium supply means in a predetermined rotation angle direction and collide with the inner peripheral surface of the main body. Having means,
The method includes applying the active energy ray-curable composition to the surface of the translucent substrate, and curing the active energy ray via the translucent substrate in the curing portion of the transfer roll. Irradiating the composition with the active energy rays and curing on the translucent substrate;
Peeling the translucent base material on which the active energy ray-curable composition has been cured from a peeling portion of the transfer roll whose temperature is lower than the cured portion by 5 ° C. or more and less than 55 ° C. ing,
An optical sheet manufacturing method is provided.

According to another preferred embodiment of the invention,
The body of the transfer roll is
A substantially cylindrical transfer sleeve in which the concavo-convex pattern to be transferred to the transfer object is formed on an outer peripheral surface;
A pair of end members disposed on both ends of the transfer sleeve in the axial direction and carrying the transfer sleeve and a mandrel having a plurality of beams interconnecting the pair of end members;
The heat medium ejected from the hollow tube passes between a plurality of beams and collides with the inner peripheral surface of the transfer sleeve.

According to the present invention, a transfer roll that has a simple structure, is easy to manufacture, has good maintainability, and can be operated with simple equipment is provided.
Furthermore, according to the present invention, an optical sheet manufacturing method using such a transfer roll is provided.

It is a schematic sectional drawing which shows the internal structure of the transfer roll of preferable embodiment of this invention. It is sectional drawing along the II-II line of FIG. It is a top view of the hollow tube attached to the transfer roll. It is a schematic sectional drawing which shows the internal structure of the transfer roll of other preferable embodiment of this invention. It is sectional drawing along the VV line of FIG. It is a schematic drawing explaining the optical sheet manufacturing process of preferable embodiment of this invention. It is a schematic drawing explaining the other optical sheet manufacturing process of preferable embodiment of this invention.

The transfer roll 1 according to the first embodiment of the present invention will be described below with reference to the drawings.
The transfer roll 1 is formed on the surface of a translucent base material such as a prism sheet, a lenticular lens sheet, and a Fresnel lens sheet on which a lens portion made of an active energy ray curable resin is formed on the surface of the translucent base material. It is a transfer roll used in optical sheet manufacturing for continuously manufacturing an optical sheet such as a moth-eye sheet on which fine irregularities made of an active energy ray curable resin or the like are formed as a long optical sheet.

FIG. 1 is a schematic cross-sectional view showing the internal structure of a transfer roll according to a preferred embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
The transfer roll 1 is a transfer roll that transfers the shape of the outer peripheral surface to a transfer object, and has a substantially cylindrical shape as shown in FIGS. 1 and 2, and a main body that is rotatable about a longitudinal axis. 2 is provided. The main body 2 has a concavo-convex pattern formed on the outer peripheral surface and has an internal space 4 inside.

  The main body 2 is generally made of an iron-based material such as a carbon steel pipe for mechanical structures used as a roll material, a non-ferrous metal material such as pure aluminum, an aluminum alloy or a copper alloy, a composite material such as a carbon fiber reinforced plastic, quartz, glass, resin, It consists of ceramics. It is preferable to use a material that has been heat-treated in advance so that the residual stress is released and not distorted by heat during machining. Moreover, when using the material which has a possibility of corrosion, such as rust, it is preferable to perform antirust plating on the outer peripheral surface and inner peripheral surface of a main body.

  The main body 2 has side plates 6 and 7 attached to both ends. The main body 2 is rotatably supported by a detachable bearing box 8 and installed on a machine base, like a known transfer roll.

  A fine concavo-convex pattern transferred to the film is formed on the outer peripheral surface of the main body 2. The fine concavo-convex pattern to be transferred is not particularly limited, but when the transfer roll 1 is used as a roll-shaped lens mold, the concavo-convex pattern has a prism lens shape, a lenticular lens shape, and a Fresnel lens. The surface shape (uneven portion transfer pattern) is complementary to the formed uneven shape such as a shape, a microlens shape, and a moth-eye shape. The shape of such a concavo-convex pattern is a pattern in which a concavo-convex pattern having the same shape is repeatedly formed along the circumferential direction of the transfer roll, but the concave (or convex) portion or the like is two-dimensional over the entire cylindrical surface of the transfer roll. The shape arrange | positioned in may be sufficient.

  The method for forming a fine uneven pattern on the outer peripheral surface of the main body 2 includes precision cutting with a diamond tool, lithography, and the like, and is not particularly limited.

  Moreover, as a preferable method of forming a fine uneven pattern on the outer peripheral surface of the main body 2, there is a method of forming anodized alumina having a plurality of pores (recesses) on the surface of an aluminum substrate.

  As this method, a method comprising the following steps (a) to (f) is a taper-shaped pore whose diameter gradually decreases in the depth direction from the opening on the surface of the mirror-finished aluminum base material. Are formed periodically, and as a result, it is preferable in that a fine concavo-convex pattern having anodized alumina having a plurality of pores formed on the surface can be obtained.

The above steps (a) to (f)
(A) A step of forming an oxide film on the surface of the aluminum base by anodizing the mirror-finished aluminum base in an electrolytic solution under a constant voltage.
(B) A step of removing the oxide film and forming anodic oxidation pore generation points on the surface of the aluminum substrate.
(C) A step of anodizing the aluminum base material on which the pore generation point is formed in the electrolytic solution again at a constant voltage to form an oxide film having pores corresponding to the pore generation point.
(D) A step of enlarging the diameter of the pores.
(E) A step of anodizing again in the electrolytic solution under a constant voltage after the step (d).
(F) A step of repeatedly performing steps (d) and (e) to obtain a fine concavo-convex shape pattern in which anodized alumina having a plurality of pores is formed on the surface of an aluminum substrate.
In order to obtain pores having high regularity, it is preferable to perform steps (b) to (c). However, when high regularity is not required, steps (b) to (c) are performed. A method may be used in which the anodization (a) and the aperture enlargement process (d) are alternately repeated.

Hereinafter, each process will be described in detail.
Step (a):
An oxide film having pores is formed on the surface of the aluminum base material by anodizing the mirror-finished cylindrical aluminum base material in an electrolytic solution under a constant voltage.
Examples of the electrolytic solution include an acidic electrolytic solution and an alkaline electrolytic solution, and an acidic electrolytic solution is preferable. Examples of the acidic electrolyte include oxalic acid, sulfuric acid, and a mixture thereof.

Step (b):
By removing the oxide film formed in the step (a), periodic depressions, that is, pore generation points are formed on the aluminum base material under the removed oxide film.

  As a method of removing the oxide film, a method of removing aluminum oxide with a solution that selectively dissolves alumina without dissolving aluminum can be mentioned. Examples of such a solution include a chromic acid / phosphoric acid mixed solution. In step (b), all or a part of the oxide film formed in step (a) may be removed.

Step (c):
The aluminum substrate having the pore generation point formed on the surface in the step (b) is anodized again under a constant voltage in the electrolytic solution, and an oxide film is formed again to form a cylindrical shape at the pore generation point. An oxide film having pores is formed.
In step (c), anodization is performed under the same conditions (electrolyte concentration, electrolyte temperature, chemical conversion voltage, etc.) as in step (a).

Step (d):
A pore diameter expansion process is performed to increase the diameter of the pores formed in the step (c).
As a specific method of the pore diameter expansion treatment, a method of immersing in a solution dissolving alumina and expanding the diameter of the pores formed in the step (c) by etching can be mentioned. Examples of such a solution for dissolving alumina include an aqueous phosphoric acid solution of about 5% by mass.

Step (e):
Anodization is again performed under the same conditions as in step (c) to form pores with a small diameter that extend downward from the bottom of the pores expanded in step (d).

Step (f):
By repeating step (d) and step (e), pores having a tapered shape whose diameter gradually decreases in the depth direction from the opening are formed.

  By constituting the transfer roll with the aluminum base material thus obtained, it is possible to obtain a transfer roll having an anodized alumina layer in which tapered pores are periodically formed arranged on the surface.

  Further, when the transfer roll 1 is used as a transfer roll for forming a smooth surface on the surface of a plastic sheet or the like or controlling the thickness of the plastic sheet or the like, even if the outer peripheral surface is a smooth surface Good.

  The outer peripheral surface on which the fine concavo-convex pattern of the main body 2 is formed may be subjected to a mold release process so that the mold release is easy. Examples of the release treatment method include a method of coating a silicone-based polymer or a fluorine polymer, a method of depositing a fluorine compound, a method of coating a fluorine-based or fluorine-silicone-based silane coupling agent, and the like.

The transfer roll 1 includes a hollow tube 10 disposed in the internal space 4 of the main body 2. The hollow tube 10 constitutes a heat medium ejecting unit that ejects a heat medium onto the inner peripheral surface of the main body 2.
The hollow tube 10 is arranged so as to extend along the longitudinal axis (the central axis of the main body 2) at the central position in the radial direction of the internal space 4 in the substantially cylindrical internal space 4. One end of the hollow tube 10 is opened and the other end is closed, and the opened one end is in fluid communication with a heat medium supply device (not shown) through a rotary joint 12.

  The rotary joint 12 is integrated with the side plate 6, and the hollow tube 10 connected to the rotary joint 12 can be removed from the main body 2 by removing the side plate 6 from the main body 2.

  Moreover, since the hollow tube 10 is fixed to the machine base so as not to rotate, it does not rotate even when the main body 2 rotates.

  The hollow tube 10 is provided with a number of injection means. The structure of the injection means is not particularly limited. For example, even if a hole is formed in a hollow tube and the hole is used as the injection means, a cylindrical protrusion injection having a cylindrical protrusion above the hole and having an injection port at the tip thereof The mouth may be used as the jetting means. In the present embodiment, an injection hole is employed as the injection means.

  A number of injection holes 14 are formed in the hollow tube 10 as injection means. The injection holes 14 are unevenly distributed in the hollow tube 10 in the circumferential direction, and the heat medium M supplied from the heat medium supply device is directed in a specific angular direction as indicated by an arrow A in FIG. The transfer roll 1 is sprayed onto the inner peripheral surface and collides with the inner peripheral surface.

The plurality of injection holes 14 are expanded so that the expansion of the heat medium M injected from the injection holes extends from substantially zero to a maximum fan-shaped range of about 90 °, more preferably from 30 ° to 60 °. It is preferably formed in the hollow tube 10.
In the present embodiment, as shown in the plan view of FIG. 3, three injection holes 14 arranged in the circumferential direction are provided over the entire length of the hollow tube 10, and the heat medium M is shown in FIG. Thus, it is comprised so that it may inject in the fan shape which has a breadth of about 60 degrees from the perpendicular upper direction to the direction of about 2 o'clock.

The shape of the injection hole 14 can be circular, elliptical, a square any other shape, the opening area of each injection hole is suitably 0.1 mm ² or more 5 mm ² or less. The arrangement in the axial direction may be other arrangements such as a staggered pattern in addition to the lattice form of FIG.

  As the heat medium supplied to the hollow tube 10, for example, water is used, but an optimal liquid is appropriately selected according to the purpose. For example, in consideration of corrosion of the roll body and the hollow tube, low viscosity oil is used.

  In this embodiment, the attachment angle (in the axial direction of the main body 2) of the hollow tube 10 with respect to the machine base can be changed, and the angle direction in which the heat medium blows out can be adjusted.

  In the present embodiment, the injection hole 14 is provided, but a configuration in which the heat medium is injected in a predetermined angular direction by a spray nozzle, a slit, or the like provided in the hollow tube 10 instead of the injection hole 14 may be employed.

A heat medium discharge port 16 is provided on the side plate 7 attached to the end of the main body 2 opposite to the side where the hollow tube 10 is inserted.
Further, in the present embodiment, a drain pipe 17 is provided for discharging the heat medium M accumulated in the bottom portion of the internal space 4 of the main body 2 after being injected from the injection hole 14 of the hollow pipe 10. The amount of the heat medium M accumulated in the internal space 4 is adjusted.

  The drain pipe 17 is fixed to the machine base in the same manner as the hollow pipe 10. Further, the drain pipe 17 has a distal end disposed at the bottom of the internal space 4 of the main body 2, a base end connected to an external drain pump (not shown), and heat accumulated in the bottom of the internal space 4 of the main body 2. The medium M is configured to be discharged out of the internal space 4. Therefore, the water level in the internal space 4 can be adjusted by adjusting the height position of the tip in the internal space 4.

  According to the transfer roll 1 having such a configuration, the temperature-adjusted heat medium M ejected from the ejection holes 14 collides with a portion located at a predetermined angle on the inner peripheral surface of the main body 2, so This part of the peripheral surface is partially cooled or heated.

  In the transfer roll of the first embodiment, the outer peripheral surface on which the concavo-convex pattern is formed and the rotation shaft are integrated, but the transfer roll of the present invention is an assembly type in which the main body is a combination of a plurality of members. However, the present invention can also be used in a form in which the transfer roll as shown in FIG. 4 includes a transfer sleeve and a mandrel.

  FIG. 4 is a schematic cross-sectional view showing the internal structure of the transfer roll 20 according to the second embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line VV of FIG. Elements of the transfer roll 20 that are common to the transfer roll 1 of the first embodiment are given the same reference numerals in FIGS. 4 and 5 as in FIGS. 1 and 2 and description thereof is omitted.

  Similar to the transfer roll 1, the transfer roll 20 is a transfer roll that transfers the shape of the outer peripheral surface to the transfer object. As shown in FIGS. 4 and 5, an uneven pattern is formed on the outer peripheral surface. The substantially cylindrical transfer sleeve 22 is combined with a mandrel 24 that is rotatable about a longitudinal axis.

  The transfer sleeve 22 and the mandrel 24 are composed of a ferrous material such as a carbon steel pipe for mechanical structure that is generally used as a roll material, a non-ferrous metal material such as pure aluminum, an aluminum alloy, or a copper alloy, and a composite material such as carbon fiber reinforced plastic. ing. It is preferable to use a material that has been heat-treated in advance so that the residual stress is released and not distorted by heat during machining. Moreover, when using the material which has a possibility of corrosion, such as rust, it is preferable to perform rust prevention plating to the outer peripheral surface and inner peripheral surface of the transfer sleeve 22 and the mandrel 24.

  On the outer peripheral surface of the transfer sleeve 22, a fine concavo-convex pattern to be transferred to the film is formed. The fine concavo-convex pattern to be transferred is the same as that formed on the outer peripheral surface of the transfer roll 1 shown in FIG.

  The mandrel 24 includes a pair of end members 26 and 26 that are disposed at both ends in the axial direction of the transfer sleeve 22 and carry the transfer sleeve 22, and a plurality of beams 28 that interconnect the pair of end members 26 and 26. .

  The pair of end members 26, 26 are arranged opposite to both ends of the transfer sleeve 22, and are attached to both ends of the transfer sleeve 22 via O-rings to close both ends of the transfer sleeve 22.

  The plurality of beams 28 extend between the pair of end members 26 and 26 in the axial direction of the transfer sleeve 22 so as to extend substantially in parallel with each other and are spaced at a predetermined angular interval (FIG. 5). The beam 28 is configured such that one end is fixed to one end member 26 and the other end is fixed to the other end member 23, whereby the end members 22 and 23 rotate in synchronization.

  Each of the pair of end members 26, 26 has opening penetrating portions 30, 32 in the axial center, and is configured so that the heat medium can flow in or out through the opening penetrating portions 30, 32.

  The transfer sleeve 22 is concentrically and detachably attached to the mandrel 24 so that the beam 28 is included inside. In this embodiment, the inner peripheral surface of the transfer sleeve 22 and the beam 28 are configured not to contact each other.

  In the present embodiment, the internal space 4 of the transfer roll 20 surrounded by the transfer sleeve 22 and the end members 26 and 26 is sealed except for the opening through portions 30 and 32.

The mandrel 24 has a mechanism that is attached to the bearing housing 8 and prevents the transfer sleeve 20 from falling off.
In this embodiment, a step 22a is provided on the end member 26 on the one end side (left side in FIG. 4), the tip of the transfer sleeve 22 is brought into contact with the step 22a, and a screw portion 22b is provided on the end member 26 on the other end side. The fastening nut 34 is attached to the screw portion 22b to prevent the transfer sleeve 20 from falling off, but other methods may be used.

  As with the transfer roll 1 of the first embodiment, side plates 6 and 7 are attached to the mandrel 24 at both ends. Similarly to the transfer roll 1, the mandrel 24 is rotatably supported by a detachable bearing box 8 and is installed on a machine base.

  The transfer roll 20 includes a hollow tube 10 and a drain pipe 17 inside as in the transfer roll 1 shown in FIG. The hollow tube 10 constitutes a heat medium ejecting unit that ejects a heat medium onto the inner peripheral surface of the mandrel 21. The heat medium ejected from the hollow tube 10 passes between the plurality of beams 28 and collides with the inner peripheral surface of the transfer sleeve 22.

  Next, an optical sheet manufacturing method using the transfer roll of the above embodiment will be described. FIG. 6 is a schematic diagram illustrating an optical sheet manufacturing method according to a preferred embodiment of the present invention.

  The optical sheet manufacturing apparatus 40 used in the optical sheet manufacturing method of the present embodiment uses the transfer roll and uses the transfer roll as the active energy ray-curable composition, except that the transfer roll 1 or 20 of the above embodiment is used. It has the same configuration as the conventional optical sheet manufacturing apparatus that shapes the surface shape with an object.

  As shown in FIG. 6, in the optical sheet manufacturing apparatus 40, the long translucent base material 42 is formed on the outer peripheral surface of the cylindrical transfer roll 1 (20) that is rotationally driven in the direction of arrow B. It is configured to be conveyed in the direction of arrow C while being wound. The transfer roll 1 is the transfer roll described above, and an uneven shape pattern (transfer pattern) complementary to the surface shape of the optical sheet to be manufactured is formed on the outer peripheral surface thereof.

  As the translucent substrate 42, for example, visible light, ultraviolet rays, and active energy rays such as an electron beam are transmitted. For example, glass, acrylic resin, polycarbonate resin, polyester resin, vinyl chloride resin, polymethacrylimide resin A material obtained by processing a material such as a film or a sheet is used.

  In order to improve the adhesion with the active energy ray-curable composition 44 used for shaping the surface shape, the surface of the translucent substrate 42 may be subjected to a surface treatment for improving the adhesion. Good. Examples of the surface treatment include a method of forming an easy-adhesion layer made of polyethylene resin, acrylic resin, urethane resin, and roughening. Further, the translucent substrate 42 may be subjected to other treatments such as antistatic, antireflection, and adhesion prevention between substrates.

The optical sheet manufacturing apparatus 40 includes a coating apparatus 46 that applies the active energy ray-curable composition 44 to the translucent substrate 42.
The structure of the coating device 46 is not particularly limited, and can be selected from known coating methods according to the viscosity of the active energy ray-curable composition 44 and the coating film thickness.
In the present embodiment, an apparatus including a nozzle 46 that supplies the active energy ray-curable composition 14 between the transfer roll 1 and the translucent substrate 42 in the vicinity of the transfer roll 1 (20) is used as a coating apparatus. Has been.

  The composition of the supplied active energy ray-curable composition 44 is not particularly limited as long as it is cured with active energy rays such as ultraviolet rays and electron beams.

  Examples thereof include polyesters, epoxy resins, polyester (meth) acrylates, epoxy (meth) acrylates, (meth) acrylate resins such as urethane (meth) acrylates, and the like. A (meth) acrylate resin is particularly preferred from the viewpoint of its optical properties.

  The active energy ray-curable composition used for such a cured resin is a polyvalent acrylate and / or a polyvalent methacrylate (hereinafter referred to as a polyvalent (meth) acrylate) in terms of handleability and curability. , Monoacrylate and / or monomethacrylate (less than, described as mono (meth) acrylate) and a photopolymerization initiator by active energy rays are preferred.

  Typical polyvalent (meth) acrylates include polyol poly (meth) acrylate, polyester poly (meth) acrylate, epoxy poly (meth) acrylate, urethane poly (meth) acrylate, and the like. These may be used alone or as a mixture of two or more.

In addition, examples of mono (meth) acrylates include mono (meth) acrylates of monoalcohols, mono (meth) acrylates of polyols, etc. In the latter case, when using a metal mold In order to reduce the difficulty of releasing from the metal mold, which is considered to be the influence of the hydroxyl group, it is preferable to use a small amount.
Moreover, when using a metal mold | type, since it has high polarity also about (meth) acrylic acid and its metal salt, it is good to use it in a small quantity.

  The nozzle 46 is connected to a tank T covered with a jacket 19 through which a temperature-controlled heat medium flows, and is configured to supply the temperature-controlled active energy ray-curable composition 44 to the nozzle 46.

  The pipe 50 connecting the nozzle 46 and the tank T is also provided with a temperature control device, and the temperature of the active energy ray-curable composition 44 at these portions is within a temperature range of 40 ° C. or more and less than 80 ° C., preferably It is controlled to be within a range of 40 ° C. or higher and 70 ° C. or lower, more preferably within a range of 40 ° C. or higher and 60 ° C. or lower. The temperature control device is not particularly limited, but a temperature control device using electric heat or a heat medium is preferable.

  As shown in FIG. 6, a nip roller 52 for making the thickness of the active energy ray-curable composition 44 before curing uniform is disposed facing the transfer roll 1 (20).

  In the optical sheet manufacturing apparatus 40, a nozzle 46 is provided between the translucent substrate 42 and the transfer roll 1 (20) in a region where the translucent substrate 42 starts to be sandwiched between the transfer roll 1 (20) and the nip roller 52. The active energy ray-curable composition 44 is supplied from. The supplied active energy ray-curable composition 44 forms a resin pool 54 between the translucent substrate 42 and the transfer roll 1 (20).

  An active energy ray irradiation device 56 is provided downstream of the nip roller 52 in the conveyance direction. In the present embodiment, the active energy ray irradiating device 56 has the active energy ray curable composition 44 disposed between the translucent substrate 42 and the transfer roll 1 (20) via the translucent substrate 42. Are arranged so as to irradiate from approximately 6 o'clock position (substantially vertically downward position).

  As the active energy ray irradiation device 56, a chemical reaction chemical lamp, a low-pressure mercury lamp, a high-pressure mercury lamp, a metal halide lamp, a visible light halogen lamp, or the like is used. The active energy ray is, for example, 200 to 600 nm, preferably such that the integrated energy in the wavelength range of 320 to 390 nm is, for example, 0.1 to 10 J / cm 2, preferably 0.5 to 8 J / cm 2. Irradiation is appropriate. Moreover, as irradiation atmosphere of an active energy ray, inert gas, such as air or nitrogen, argon, is mentioned.

  In the optical sheet manufacturing apparatus 40, the active energy ray irradiating device 56 irradiates the active energy ray curable composition 44 with the active energy ray curable composition 44 from approximately 6 o'clock, so that the active energy ray curable composition on the translucent substrate 42. The cured portion H where the object 44 is cured becomes a lower position H (a position in the approximately 6 o'clock direction) of the transfer roll 1 (20). Moreover, the peeling part R of the translucent base material 42 is diagonally above (the position in the approximately 2 o'clock direction) of the outer peripheral surface of the transfer roll 1 (20).

  In the optical sheet manufacturing apparatus 40, the injection hole 14 formed in the hollow tube 10 of the transfer roll 1 (20) moves the cooled medium from approximately 12:00 (vertically upward) to approximately 2 o'clock (that is, the peeling portion R). It is comprised so that it may inject toward a fan shape. As a result, the heat medium M injected from the injection hole 14 is caused to collide with the inner peripheral surface of the main body 2 from approximately 12:00 (vertically upward) to 2 o'clock (that is, the back side of the peeling portion R), thereby The peeled portion R of the surface is cooled to a relatively low temperature as compared with the cured portion H.

In the manufacture of the optical sheet by the optical sheet manufacturing apparatus 40, the translucent substrate 42 is sandwiched between the transfer roll 1 and the nip roller 52 at a position of approximately 9 o'clock.
As described above, in the optical sheet manufacturing apparatus 40, the translucent base material 42 and the transfer roll 1 (20) are regions where the translucent base material 42 starts to be sandwiched between the transfer roll 1 (20) and the nip roller 52. Since the resin pool 54 of the active energy ray-curable composition 44 is formed between the two, the translucent base material 42 is active energy ray-curable on one surface (the surface on the transfer roll 1 (20) side). The composition 44 is nipped between the transfer roll 1 (20) and the nip roller 52 with the composition 44 adhered thereto.

  Therefore, the translucent substrate 42 is directed so that the surface on which the active energy ray-curable composition 44 is applied is directed to the transfer roll 1, and this surface is pressed against the outer peripheral surface of the transfer roll 1 (20). It is sandwiched between the transfer roll 1 (20) and the nip roller 52.

  Next, the translucent substrate 42 is wound around the outer peripheral surface of the transfer roll 1, and is transferred in the rotation direction (B direction) of the transfer roll 1 (20) by the rotation of the transfer roll 1 (20). At this time, the uncured active energy ray-curable composition 44 applied to one surface of the translucent substrate 42 is transferred with the outer peripheral surface shape of the transfer roll 1 (20), and the transfer roll 1 (20). It becomes a shape complementary to the outer peripheral surface shape.

  Next, at the position of approximately 6 o'clock (cured portion H), the active energy ray curable composition 44 is irradiated with the active energy ray from the active energy ray irradiating device 56 through the translucent base material 42 from below in the vertical direction. The linear curable composition 44 is cured on the translucent substrate 42.

  As described above, since the outer peripheral surface shape of the transfer roll 1 (20) is transferred to the uncured active energy ray curable composition 44, the cured active energy ray curable composition 44 transfers the transfer roll. A lens portion having a shape complementary to the transfer pattern on the outer peripheral surface is formed on the surface of the translucent substrate 42.

  The translucent base material 42 on which the active energy ray-curable composition 44 is cured on the upper surface is further transferred in the rotation direction of the transfer roll 1 by the rotation of the transfer roll 1 (20), and is positioned at about 2 o'clock (peeling). Part R) is peeled from the transfer roll 1 (20).

  In the present embodiment, the temperature of the outer peripheral surface of the transfer roll 1 or 20 (the main body 2 or the transfer sleeve 22) is controlled to 40 ° C. or more and less than 80 ° C. in the curing unit H by temperature control using the heat medium M. In this embodiment, the temperature of the outer peripheral surface of the transfer roll 1 or 20 (the main body 2 or the transfer sleeve 22) is set lower in the peeling portion R in the range of 5 ° C. or higher and lower than 55 ° C. from the hardened portion H. Yes.

  Specifically, the surface temperature of the hardened portion H on the outer peripheral surface of the main body 2 or the transfer sleeve 22 is preferably in the range of 40 ° C. or higher and lower than 80 ° C., more preferably in the range of 40 ° C. or higher and 70 ° C. or lower, and further preferably 40 ° C. or higher. It is preferable to control the temperature of the heat medium M so as to be within a range of 60 ° C. or less.

  When the temperature is lower than 40 ° C., the adhesion between the translucent substrate 42 and the active energy ray curable composition 44 is not improved, and the cured active energy ray curable resin adheres to the transfer roll 1 at the time of peeling. May cause problems.

  On the other hand, when the temperature is 80 ° C. or higher, the translucent base material 42 is softened, the viscosity and density of the active energy ray-curable composition 44 are lowered, the shrinkage rate is large when polymerized and cured, and the warpage of the sheet is increased. Such a phenomenon may occur, which is not preferable.

  Further, the temperature of the peeling portion R existing on the outer peripheral surface upper side of the main body 2 or the transfer sleeve 22 is set lower than the temperature of the hardening portion H in a range of 5 ° C. or more and less than 55 ° C.

When the temperature of the hardened portion H is in the range of 40 ° C. or higher and 70 ° C. or lower, it is more preferable to control the temperature of the peeling portion R to be lower than the temperature of the hardened portion H by 15 ° C. or higher and lower than 45 ° C.
When the temperature of the hardened portion H is in the range of 40 ° C. or higher and 60 ° C. or lower, it is more preferable that the temperature of the peeling portion R is controlled to be lower by 25 ° C. or higher and lower than 35 ° C. .

  In order to improve the peelability as the temperature difference between the hardened part and the peeled part increases, the temperature difference between the hardened part H and the peeled part R is preferably as large as possible. However, when the temperature of the peeling portion R is lower than 20 ° C., dew condensation occurs, and an undesirable phenomenon such as an increase in moisture in the obtained long optical sheet occurs.

  According to the present embodiment, an optical that can perform curing of an active energy ray-curable composition using a transfer roll, peeling of a lens portion made of an active energy ray-curable resin from the transfer roll, and the like at an appropriate temperature. A sheet manufacturing method is provided.

  The present invention is not limited to the above-described embodiment, and various changes or modifications can be made within the scope of the matters described in the claims.

  The optical sheet manufacturing apparatus is an optical sheet manufacturing method in which the active energy ray-curable composition 44 is applied to the upper surface of the translucent substrate 42 at a portion where the active energy ray-curable composition 44 is sandwiched between the transfer roll 1 (20) and the nip roller 52. Although the apparatus is an apparatus, the transfer roll of the present invention can also be used in an optical sheet manufacturing apparatus 40 ′ (FIG. 7) in which the active energy ray-curable composition 44 is applied to the lower surface of the translucent substrate 42. Thus, the optical sheet manufacturing method of the present invention can also be implemented by an optical sheet manufacturing apparatus as shown in FIG.

Next, examples of the present invention will be described.
[Example 1]
A roll body with a steel roll of φ200 mm, length 600 mm, and thickness 10 mm is subjected to surface polishing finish, hard copper plating with a thickness of 200 μm and Vickers hardness 200 Hv is applied to the outer peripheral surface, and hard copper plating is applied to the outer peripheral surface. Forming a prism part transfer pattern for transferring and forming a prism part formed by arranging a large number of prisms in parallel with an isosceles triangular shape having a pitch of 30 μm, a height of 15 μm, and an apex angle of 90 °; Was subjected to electroless nickel plating treatment with a thickness of 3 μm to obtain a transfer roll.

  A steel hollow tube with a diameter of 12 mm, a length of 615 mm, and a thickness of 2 mm is threaded with M10 screws in the range of 10 mm from one end, 120 rows in the range of 605 mm in the axial direction from the other end, 120 rows at a pitch of 5 mm, 30 in the circumferential direction. A total of 360 φ1 mm holes were provided every 10 ° in the range of °, and a hollow tube was inserted into the roll body. Showa Giken rotary joint RXH3125 is used as a flow path connection of the hollow tube that does not rotate with the roll, and the heat medium sprayed from the hole in the hollow tube spreads over about 30 degrees from 12:00 to 2 o'clock. It was fixed on the central axis of the roll body so as to be oriented in a fan shape. Moreover, the flow path not using the rotary joint was blocked.

  An NBR rubber roll (nip roller) having a rubber hardness of 20 ° in which a steel roller core having a diameter of 120 mm and a surface length of 600 mm was coated was disposed so as to be close to the transfer roll obtained as described above. A pneumatic cylinder (pressure) supplied with Toyobo polyester film (translucent substrate) with a thickness of 125 μm slightly wider than the transfer roll between the transfer roll and the nip roller, and connected to the NBR rubber roll. By adjusting mechanism), a Toyobo polyester film was nipped between the NBR rubber roll and the transfer roll.

  The operating pressure of the pneumatic cylinder at this time was 0.4 MPa (2.65 N / mm). As a pneumatic cylinder, an SMC air cylinder having an air tube diameter of 40 mm was used. Furthermore, an ultraviolet irradiation device (active energy ray irradiation device) was installed below the transfer roll. As the ultraviolet irradiation device, a high-pressure mercury lamp having a lamp emission length of 70 cm and 160 W / cm was used.

  The ultraviolet curable composition (active energy ray curable composition) was put into a resin tank (tank). The resin tank was entirely made of stainless steel (SUS304) in contact with the ultraviolet curable composition. In addition, a jacket for controlling the liquid temperature of the ultraviolet curable composition is provided, and water adjusted to 40 ° C. by a heater is supplied to the jacket, and the liquid temperature of the ultraviolet curable composition in the resin tank is adjusted. Maintained at 40 ° C. Further, the foam generated at the time of charging was removed by deaeration by evacuating the resin tank with a vacuum pump.

The ultraviolet curable composition is as follows, and the viscosity is 150 mPa · S / 40 ° C.
50 parts by weight of phenoxyethyl acrylate (Osaka Organic Chemical Company Biscoat # 192)
50 parts by weight of bisphenol A-diepoxy-acrylate (epoxy ester 3000A manufactured by Kyoeisha Yushi Chemical Co., Ltd.)
2-hydroxy-2-methyl-1-phenyl-propan-1-one (Darocur 1173 manufactured by Cibagayki Co., Ltd.) was adjusted to 1.5 parts by weight.

  The inside of the resin tank was returned to normal pressure, and an ultraviolet curable composition whose temperature was controlled at 40 ° C. was applied from a Yuri roll T-die to a Toyobo polyester film (translucent substrate) with a Tacmina gear pump.

  Next, water whose temperature was controlled at 38 ° C. was supplied to the flow path of the transfer roll at a flow rate of 20 liters / minute using a Kawasaki mold temperature adjusting device (DYNATHERMεz KCWIII-05Hεz2). At this time, the temperature of the outer peripheral surface of the transfer roll until it is irradiated with active energy rays by injecting water to the peeling portion through the hollow tube provided with the medium ejection holes and accumulating water at the bottom of the inner space of the transfer roll. Adjusted. Moreover, the thickness adjustment of the active energy ray-curable composition 18 was completed in a state where the ultraviolet curable composition was sandwiched between the Toyobo polyester film and the transfer roll.

  While rotating the transfer roll in the direction of the arrow at a peripheral speed of 5.3 m per minute with a Mitsubishi Electric AC servo 200W (reduction ratio 1/100), the UV curable composition was placed between the polyester film and the transfer roll made by Toyobo. While being sandwiched, ultraviolet rays were irradiated from an ultraviolet irradiation device to polymerize and cure the ultraviolet curable composition to transfer the prism portion transfer pattern of the transfer roll. Then, it peeled from the transfer roll and obtained the elongate optical sheet (prism sheet).

  When manufacturing a long prism sheet, peeling of the outer peripheral surface of the transfer roll from the side surface using a contact thermocouple (SH-11K-TS1-W) manufactured by Anritsu Keiki and a mobile temperature recorder (NR-1000) manufactured by KEYENCE It was 40 degreeC when the surface temperature in a part was measured. Similarly, the surface temperature at the cured portion on the outer peripheral surface of the transfer roll was measured and found to be 48 ° C.

  When the Martens hardness of the obtained optical sheet was measured with an ultra micro hardness meter (Fischer Scope HM2000) manufactured by Fischer Instruments, the Martens hardness was 90 N / mm 2.

[Example 2]
A long optical sheet was obtained in the same manner as in Example 1 except that the temperature of water supplied from the heat medium supply port was 30 ° C.

  When manufacturing a long optical sheet, peeling of the outer peripheral surface of the transfer roll from the side surface using a contact thermocouple (SH-11K-TS1-W) manufactured by Anritsu Keiki and a mobile temperature recorder (NR-1000) manufactured by Keyence The surface temperature at the part was measured to be 32 ° C. Similarly, the surface temperature at the cured portion on the outer peripheral surface of the transfer roll was 40 ° C.

  When the Martens hardness of the obtained optical sheet was measured with an ultra micro hardness meter (Fischer Scope HM2000) manufactured by Fischer Instruments, the Martens hardness was 80 N / mm 2.

[Example 3]
A long optical sheet was obtained in the same manner as in Example 1 except that the temperature of water supplied from the heat medium supply port was 70 ° C.

  When manufacturing a long optical sheet, peeling of the outer peripheral surface of the transfer roll from the side surface using a contact thermocouple (SH-11K-TS1-W) manufactured by Anritsu Keiki and a mobile temperature recorder (NR-1000) manufactured by Keyence It was 71 degreeC when the surface temperature in a part was measured. Similarly, the surface temperature of the cured portion on the outer peripheral surface of the transfer roll was measured and found to be 79 ° C.

  When the Martens hardness of the obtained optical sheet was measured with an ultra-micro hardness meter (Fischer scope HM2000) manufactured by Fischer Instruments, the Martens hardness was 95 N / mm 2.

[Example 4]
Surface polishing finish on a roll made of pure aluminum of φ200mm, length 550mm, thickness 5mm to make a mirror surface,
An 0.5 M oxalic acid was used as the electrolytic solution, and an aluminum plate having a thickness of 0.5 mm was used for each of the cathode and the anode. Anodization was performed at a voltage of 40 V at 16 ° C. for 6 hours to form an oxide film. (Step (a)) Next, the anode was immersed in a 6% by mass phosphoric acid / 1.8% by mass chromic acid mixed acid at 70 ° C. to dissolve the oxide film (alumina layer) (step (b)).

  Next, second-stage anodic oxidation was performed. That is, after washing with pure water, an anodized film was formed by performing anodization for 25 seconds at 16 ° C. at a voltage of 40 V using 0.3 M oxalic acid as an electrolyte (step (c)). As it was, it was immersed in 32 ° C. and 5% by mass phosphoric acid for 8 minutes to carry out an etching treatment, thereby expanding the pores (step (d)).

  Thereafter, the oxide film formation step (step (e)) and the pore diameter expansion treatment step (step (d)) in the second stage anodization are repeated as a set for a total of 5 sets (step (f)), A transfer sleeve having oxide film thickness: 200 nm, pore period: 100 nm, pore diameter: 95 nm, overall pore depth: 180 nm and having substantially conical pores on the entire outer peripheral surface was obtained. .

  By cutting the end part 25 mm of a steel roll having a diameter of 200 mm, a length of 30 mm, and a thickness of 15 mm from the outside to a thickness of 10 mm, the end member on the base end side is made of a steel roll having a diameter of φ195 mm, a length of 30 mm and a thickness of 10 mm. An M190 pitch 2 mm screw was cut in the area of the end 10 mm to obtain an end member on the tip side. Eight steel round bars having a length of 500 mm and a diameter of 20 mm were used as beams. A mandrel was obtained by welding the central rotating shaft to both ends of the beam so that the two axial centers of the end members coincide. As for the O-ring, Mori Seika Kogyo O-ring (C1900G) was used, and the tightening nut was manufactured by cutting a steel roll having a diameter of 200 mm, a length of 3 mm, and a thickness of 8 mm.

  A long moth-eye sheet was obtained in the same manner as in Example 1 except that a transfer roll composed of the above-described transfer sleeve and mandrel was used.

  When manufacturing a long optical sheet, peeling of the outer peripheral surface of the transfer roll from the side surface using a contact thermocouple (SH-11K-TS1-W) manufactured by Anritsu Keiki and a mobile temperature recorder (NR-1000) manufactured by Keyence The surface temperature at the part was 38 ° C. Similarly, the surface temperature at the cured portion on the outer peripheral surface of the transfer roll was measured and found to be 48 ° C.

  When the Martens hardness of the obtained moth-eye sheet was measured with an ultra-micro hardness meter (Fischer Scope HM2000) manufactured by Fischer Instruments, the Martens hardness was 90 N / mm 2.

[Comparative Example 1]
As a comparison of the temperature difference between the hardened part and the peeled part, it was the same as Example 1 except that the hollow tube inserted into the roll body was removed. At this time, the temperature-controlled water was supplied from the heat medium supply port without passing through the hollow tube. When production was performed under these conditions, the active energy ray curable resin, which is a cured product, partially adhered to the transfer roll due to insufficient cooling, resulting in poor peeling due to the adhered cured product as a starting point. A scale optical sheet could not be obtained continuously.

  When manufacturing a long optical sheet, peeling of the outer peripheral surface of the transfer roll from the side surface using a contact thermocouple (SH-11K-TS1-W) manufactured by Anritsu Keiki and a mobile temperature recorder (NR-1000) manufactured by Keyence It was 45 degreeC when the surface temperature in a part was measured. Similarly, the surface temperature at the cured portion on the outer peripheral surface of the transfer roll was 46 ° C.

[Comparative Example 2]
As a comparison regarding the lower limit of the hardened part temperature, it was the same as Example 1 except that the temperature of water supplied from the heat medium supply port was 20 ° C. At this time, the active energy ray curable resin as a cured product adhered to the transfer roll, and a long optical sheet could not be obtained.

  When manufacturing a long optical sheet, peeling of the outer peripheral surface of the transfer roll from the side surface using a contact thermocouple (SH-11K-TS1-W) manufactured by Anritsu Keiki and a mobile temperature recorder (NR-1000) manufactured by Keyence It was 23 degreeC when the surface temperature in a part was measured. Similarly, the surface temperature at the cured portion on the outer peripheral surface of the transfer roll was 28 ° C.

[Comparative Example 3]
As a comparison regarding the upper limit of the curing part temperature, it was the same as Example 1 except that the temperature of the water supplied from the heating medium supply port was 80 ° C. At this time, since the polyester film was softened by heating and wrinkles were generated, a long optical sheet could not be obtained.

When manufacturing a long optical sheet, peeling of the outer peripheral surface of the transfer roll from the side using a contact thermocouple (SH-11K-TS1-W) manufactured by Anritsu Keiki and a mobile temperature recorder (NR-1000) manufactured by Keyence The surface temperature at the part was 80 ° C. Similarly, the surface temperature of the cured portion on the outer peripheral surface of the transfer roll was measured and found to be 88 ° C.

Claims (5)

A transfer roll for transferring an outer peripheral surface shape to a transfer object,
An uneven cylindrical pattern is formed on the outer peripheral surface, and a substantially cylindrical main body having a hollow portion inside,
A heat medium ejecting means that is disposed in the hollow portion and injects a heat medium onto the inner peripheral surface of the main body,
The heat medium ejecting means includes a hollow tube having at least one end connected to a heat medium supply device and arranged to extend from the outside of the main body to the inside of the hollow portion,
The hollow tube has a plurality of injection means for injecting the heat medium supplied from the heat medium supply means in a predetermined rotational angle direction to collide with the inner peripheral surface of the main body.
A transfer roll characterized by that. The body is
A substantially cylindrical transfer sleeve in which the concavo-convex pattern to be transferred to the transfer object is formed on an outer peripheral surface;
A pair of end members disposed on both ends of the transfer sleeve in the axial direction and carrying the transfer sleeve and a mandrel having a plurality of beams interconnecting the pair of end members;
The heat medium ejected from the hollow tube passes between a plurality of beams and collides with an inner peripheral surface of the transfer sleeve;
The transfer roll according to claim 1. The uneven pattern is a lens part transfer pattern,
The transfer roll according to claim 1 or 2. Production of an optical sheet in which an active energy ray-curable composition placed between a transfer roll and a translucent substrate is cured by irradiating with an active energy ray to form a fine uneven shape on the translucent substrate A method,
The transfer roll is a transfer roll for transferring the outer peripheral surface shape to the transfer object,
An uneven cylindrical pattern is formed on the outer peripheral surface, and a substantially cylindrical main body having a hollow portion inside,
A heat medium ejecting means that is disposed in the hollow portion and injects a heat medium onto the inner peripheral surface of the main body,
The heat medium ejecting means includes a hollow tube having at least one end connected to a heat medium supply device and arranged to extend from the outside of the main body to the inside of the hollow portion,
The hollow tube has a plurality of injection means for injecting the heat medium supplied from the heat medium supply means in a predetermined rotation angle direction to collide with the inner peripheral surface of the main body, and the method includes:
Applying the active energy ray-curable composition to the surface of the translucent substrate;
Irradiating the active energy ray-curable composition with the active energy ray through the translucent substrate at the cured portion of the transfer roll and curing the active energy ray on the translucent substrate;
Peeling the translucent base material on which the active energy ray-curable composition has been cured from a peeling portion of the transfer roll whose temperature is lower than the cured portion by 5 ° C. or more and less than 55 ° C. ing,
An optical sheet manufacturing method characterized by the above. The body of the transfer roll is
A substantially cylindrical transfer sleeve in which the concavo-convex pattern to be transferred to the transfer object is formed on an outer peripheral surface;
A pair of end members disposed on both ends of the transfer sleeve in the axial direction and carrying the transfer sleeve and a mandrel having a plurality of beams interconnecting the pair of end members;
The heat medium ejected from the hollow tube passes between a plurality of beams and collides with an inner peripheral surface of the transfer sleeve;
The manufacturing method of the optical sheet of Claim 4.

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