JP2010094934A - Apparatus for manufacturing transfer sheet for fine pattern - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing a transfer sheet for fine patterns, and to achieves a low manufacturing cost and high manufacturing efficiency by changing only a damaged mold piece in a plurality of mold pieces which have fine patterns on the surface and are fixed on a base plate with an adhesive without the need for the entire correction of the mold even if the mold is damaged during molding. <P>SOLUTION: The apparatus for manufacturing the transfer sheet for fine patterns includes a mold composed of a plurality of mold pieces having fine rugged patterns at one side, a buffer, and a plate pressing the buffer against the mold. The mold is constituted in a way that the mold pieces are fixed on the base plate via an adhesive. The adhesive is applied to only edges of opposite surfaces of surfaces of the mold pieces on which the fine rugged patterns are formed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a manufacturing apparatus for a fine shape transfer sheet.

Conventionally, as a means for producing an optical film such as a light guide plate, a light diffusing plate, and a lens, a press molding method is known in which a fine uneven shape provided on the surface of a mold is transferred to the surface of a resin plate-like body ( Patent Documents 1 and 2).
JP-A-2005-74700 JP 2007-90851 A

  The molds of the press molding method as described in Patent Documents 1 and 2 are becoming larger in size as the optical film becomes larger. As a result, there is a problem that the time and cost of remodeling due to damage to the mold further pressurize the profit. In addition, even if such a mold has a minute mold defect, it is difficult to correct only the defective part, and it is necessary to remodel the entire mold. Furthermore, it is very difficult to clean a large mold, and securing it in a storage place or the like often becomes a problem.

  In view of such problems, the object of the present invention is to eliminate the need to modify the entire surface of the mold even if the mold is damaged during the molding process, and to finely adhere to the surface fixed by the adhesive on the metal substrate. To provide a manufacturing apparatus for a fine shape transfer sheet that can reduce production costs and increase production efficiency by exchanging only damaged mold pieces among a plurality of mold pieces having a shape. is there.

The apparatus for producing a fine shape transfer sheet of the present invention has the following configuration. That is,
A mold composed of a plurality of mold pieces each having a fine concavo-convex shape formed on one side;
Cushioning material,
An apparatus for producing a fine shape transfer sheet, including a plate for pressing the cushioning material toward the mold,
The mold is obtained by fixing the plurality of mold pieces on a substrate via an adhesive, and the adhesive is a surface opposite to the surface on which the fine uneven shape of the mold piece is formed. It is the manufacturing apparatus of the fine shape transfer sheet | seat adhere | attached only on the edge part.

  Moreover, the manufacturing apparatus of the fine shape transfer sheet of the preferable aspect of this invention is a manufacturing apparatus of the fine shape transfer sheet which has an elastic body further in the cavity part enclosed by the said mold piece, an adhesive, and a board | substrate.

  According to the present invention, even if the mold is damaged during the molding process, it is not necessary to completely correct the mold, and a plurality of molds having fine shapes formed on the surface fixed by the adhesive on the metal substrate. By exchanging only damaged mold pieces among the mold pieces, it is possible to reduce the production cost and increase the production efficiency.

Hereinafter, the apparatus for producing a fine shape transfer sheet of the present invention will be described in more detail.
First, the apparatus for producing a fine shape transfer sheet according to the present invention is for pressing a mold made of a plurality of mold pieces each having a fine concavo-convex shape formed on one side, a cushioning material, and the cushioning material to the mold side. A fine shape transfer sheet manufacturing apparatus including the plate plate, wherein the mold is obtained by solidifying the plurality of mold pieces on a substrate via an adhesive, and the adhesive is the mold. It is characterized in that it is bonded only to the end portion of the surface opposite to the surface on which the fine concavo-convex shape of the mold piece is formed.

  FIG. 1 shows a schematic cross-sectional perspective view of a mold in which a plurality of mold pieces each having a fine concavo-convex shape formed on one side are fixed on a substrate with an adhesive. The mold 3 according to the present invention is obtained by fixing each of a plurality of mold pieces 4 having fine irregularities formed on a surface thereof onto a substrate 15b with an adhesive 5, and the substrate is an aluminum alloy temperature control plate. The one controlled by an electric heater cast in the plate is good. Alternatively, the heating control may be performed by flowing a temperature-controlled heat medium into a copper or stainless steel pipe cast in the temperature control plate or a hole processed by machining. Furthermore, the apparatus structure which combined both may be sufficient.

As the heat medium, Barrel Therm (Matsumura Oil Co., Ltd.), NeoSK-OIL (Soken Techniques Co., Ltd.) or the like may be used, and water heated to 100 ° C. or higher may be circulated. And it is preferable that the number of lay nozzles in the pipe is in the range of 1.0 × 10 ^{4 to} 12 × 10 ⁴ so that heat can be transferred efficiently.

  Moreover, when using a cast heater, a cartridge heater, etc., it is preferable that the temperature control plate can be divided and controlled.

  It is preferable that the temperature control plate falls within a temperature distribution within 10 ° C., more preferably within 5 ° C., in the range during temperature increase, temperature decrease, and constant temperature control.

  The plate plate according to the present invention plays a role of pressing the sheet-shaped resin base material in the mold direction when the sheet-shaped resin base material is pressed onto the mold and the fine shape is transferred onto the surface of the sheet-shaped resin base material. It is something to do. The flatness on the film pressing surface side of the plate plate is preferably 10 μm or less, more preferably 5 μm or less. Moreover, when pressing a sheet-like resin base material, the plate plate may be provided with a function capable of heating / cooling control so that the sheet-like resin base material can be heated and cooled.

  The plurality of mold pieces according to the present invention have fine concavo-convex shapes on one side, and for example, a replica can be easily produced from one master piece by electroforming. The thickness of the mold piece is not particularly limited, but a thickness of 0.3 mm to 5 mm is preferable in consideration of suitability for electroforming and handling. Moreover, although the some metal mold | die piece shown in FIG. 1 is a rectangle, it cannot be overemphasized that a shape is not specifically limited to this. The material of the mold piece is not particularly limited as long as the desired strength at the time of pressing and patterning accuracy can be obtained. For example, a metal material containing stainless steel, nickel, copper or the like is preferably used. The fine uneven shape of the mold piece is formed corresponding to the fine uneven shape to be imparted to the film surface.

  As an adhesive that fixes a substrate and a plurality of mold pieces, when a plate-shaped resin substrate is pressed onto a mold by a plate plate and a fine shape is transferred onto the surface of the sheet-shaped resin substrate, a plate or a mold is used. Since the mold may be heated, it is sufficient if it has excellent heat resistance that does not peel off when the press is released or its adhesiveness does not change over time. Examples of the pressure-sensitive adhesive include model number No. manufactured by Nitto Denko Corporation. Examples include 5919 (adhesive thickness 50 μm).

  As shown in FIG. 1, the pressure-sensitive adhesive is adhered only to the edge portion on the short side of the mold piece, and the other portion becomes a cavity to form a step. For this reason, it is necessary to absorb the level difference at the time of pressing and to restore the reduced thickness of the cushioning material to the original state each time even if the pressing is repeatedly performed. In addition, when a plate-shaped resin substrate is pressed onto a mold by a plate plate and a fine uneven shape is transferred to the surface of the sheet-shaped resin substrate, the plate or the mold may be heated. It may be necessary. Furthermore, when the sheet-shaped resin substrate is pressed by the plate plate and the press is released, the sheet-shaped resin substrate is detached from the mold and follows the plate plate, and the sheet-shaped resin substrate. The plate plate is pressed directly against the non-molded surface of the sheet, or the non-molded surface of the sheet-like resin substrate is scratched by pressing with a buffer material having a large surface roughness, or the surface roughness of the plate plate or the buffer material It is necessary to avoid the problem that the image is transferred.

  As such a cushioning material, for example, a laminate of model number F200 manufactured by Kinyo Co., Ltd. and model number Toyoflon F100 (material: FEP) manufactured by Toray Film Processing Co., Ltd. can be exemplified. F200 absorbs the level difference between the pressure-sensitive adhesive and the cavity at the time of pressing, and even if the pressing is repeatedly performed, the thickness reduction amount of the cushioning material is restored to the original state each time. When a sheet-shaped resin substrate is pressed by a plate plate and the press is released, the sheet-shaped resin substrate is detached from the mold and follows the plate plate, or the sheet-shaped resin substrate is not molded Pressing the plate directly against the surface or pressing with a cushioning material with a large surface roughness will scratch the non-molded surface of the sheet-like resin substrate, or the surface roughness of the plate or cushioning material will be transferred. To avoid the problem of Therefore, the buffer material of the present invention is preferably formed by laminating two kinds of buffer materials so that Toyoflon F100 is placed on the side in contact with the non-molded surface of the sheet-like resin base material.

Here, the “non-molded surface of the sheet-like resin substrate” is a surface opposite to the surface (molded surface) that comes into contact with the mold when pressed by the plate plate. Toyoflon F100 is made of tetrafluoroethylene-6fluoropropylene copolymer (FEP), but other materials having heat resistance and releasability include tetrafluoroethylene-ethylene copolymer (ETFE), tetra Fluoroethylene-perfluoroalkoxyethylene copolymer (PFA) and the like can be mentioned, but these can be used without significant difference. As another usage, when there is a scratch on the non-molded surface of the sheet-like resin base material before molding, the surface is used instead of Toyoflon F100 in order to make it have no problem in appearance and performance. A fine uneven film roughened with particles can also be used. By using the fine concavo-convex film, the fine concavo-convex shape can be transferred to the non-molded surface side of the sheet-like resin substrate, the scratches and the like can be made inconspicuous, and the performance can be maintained. Such a fine concavo-convex film uses an optical polyester film (Lumirror (registered trademark) U46 manufactured by Toray Industries, Inc., thickness of 100 μm), an acrylic resin on a commercially available hard coat agent (Desolite (registered trademark) Z7528 manufactured by JSR) on an easily adhesive surface. A microgravure coater was used to coat a paint in which particles (particle size 2.0 μm, refractive index 1.53 concentration: 3% by weight in the solid content of the coating material) was diluted with isopropyl alcohol to a solid content concentration of 30%. After drying at 80 ° C. for 1 minute, it is cured by irradiating with 1.0 J / cm ² of ultraviolet rays to provide a fine uneven layer having a thickness of 3 μm. In addition, the adhesive may be bonded to the edge part on the long side instead of the edge part on the short side of the mold piece, and is bonded to both the edge part on the short side and the long side. Also good. In short, when the mold piece is damaged during the molding process, any method may be used as long as only the damaged mold piece can be peeled off and replaced.

  When the adhesive 5 is used only at the edge portion of the mold piece 4, a cavity surrounded by the mold piece 4, the adhesive 5 and the substrate 15b is formed. If there is such a hollow portion, when the sheet-shaped resin base material is pressed onto the mold by the plate plate, the central portion of the mold piece may be bent and transfer failure may occur. Therefore, in order to prevent this transfer failure, it is preferable to install an elastic body in this cavity. FIG. 2 is a schematic cross-sectional view when an elastic body is installed in the cavity. The elastic body may press the plate or mold at the time of pressing when transferring the fine shape to the surface of the sheet-like resin substrate by pressing the sheet-shaped resin substrate to the mold with the plate plate, As long as it is excellent in heat resistance, any of various rubbers and various films may be used, and the thickness is not particularly limited as long as the thickness is equal to or less than the thickness of the pressure-sensitive adhesive.

  The sheet-like resin base material according to the present invention may be a thin plate-like material mainly composed of a thermoplastic resin, and a single layer body made of a thermoplastic resin for molding (hereinafter, thermoplastic resin for molding), which will be described later, A two-layer laminate in which a thermoplastic resin for molding is laminated on one side of the support, a three-layer laminate in which a thermoplastic resin for molding is laminated on one side of the support and a resin different from the thermoplastic resin for molding is laminated on the other side And a three-layer laminate in which a thermoplastic resin for molding is laminated on both sides of the body and the support. The monolayer is excellent in handling on the film. The two-layer laminate can impart surface characteristics such as slipperiness and friction resistance, mechanical strength, and heat resistance to the surface opposite to the surface on which the molding thermoplastic resin is disposed. Moreover, since the use of an expensive thermoplastic resin for molding can be reduced, the cost can be suppressed as compared with a single-layer body. The three-layer laminate is preferable from the viewpoint that curling after molding can be prevented because the resin is laminated on both sides of the support. In particular, a three-layer laminate in which a thermoplastic resin for molding is laminated on both sides of a support is preferable because the properties of the resins on both sides are the same, and curling can be easily prevented. In addition, a single layer body made of a molded thermoplastic resin, a layer made of a thermoplastic resin for molding on the molding surface of a two-layer laminate or a three-layer laminate, has a molding thermoplastic as long as the effect of the present invention is not impaired. Components other than the resin may be included.

  The thickness of the sheet-like resin substrate is preferably in the range of 0.01 to 3 mm, more preferably in the range of 0.01 to 1 mm. If it is less than 0.01 mm, the thickness may not be sufficient for molding, and if it exceeds 3 mm, it may be difficult to convey due to the rigidity of the substrate.

  The thermoplastic resin for molding according to the present invention is a thermoplastic resin having a glass transition temperature Tg of preferably 40 to 180 ° C, more preferably 50 to 160 ° C, and most preferably 50 to 120 ° C. When the glass transition temperature Tg is less than 40 ° C., the heat resistance of the molded product is lowered and the shape may change with time. In addition, if the temperature exceeds 180 ° C., the molding temperature must be increased, resulting in inefficiency in energy, and the volume fluctuation during heating / cooling of the film increases, so that the film can be bitten into the mold and released. Even if it disappears or can be released from the mold, the transfer accuracy of the pattern may be lowered, or the pattern may be partially lost, which may be a defect. The thermoplastic resin for molding is preferably a polyester resin such as polyethylene terephthalate, polyethylene-2, 6-naphthalate, polypropylene terephthalate or polybutylene terephthalate, or a polyolefin resin such as polyethylene, polystyrene, polypropylene, polyisobutylene, polybutene or polymethylpentene. Resin, cyclic polyolefin resin, polyamide resin, polyimide resin, polyether resin, polyester amide resin, polyether ester resin, acrylic resin, polyurethane resin, polycarbonate resin, polyvinyl chloride resin, etc. It consists of a thermoplastic resin. Among these, there are various types of monomers to be copolymerized, and it is easy to adjust the physical properties of the materials, so that polyester resins, polyolefin resins, polyamide resins, acrylic resins or these are particularly preferable. It is preferable that it is mainly formed from a thermoplastic resin selected from the above mixture, and it is more preferable that the above-mentioned thermoplastic resin is composed of 50% by weight or more.

  As a method for forming a sheet-shaped resin substrate, for example, in the case of a single layer body, a sheet forming material is heated and melted in an extruder and extruded from a die onto a cast drum cooled (melted) Casting method). As another method, a sheet forming material is dissolved in a solvent, and the solution is extruded from a die onto a support such as a cast drum or an endless belt to form a film, and then the solvent is dried and removed from the film layer. A method of processing into a shape (solution casting method) and the like are also included.

  In addition, as a method for producing a laminate, a support resin and a molding thermoplastic resin are respectively charged into two extruders, melted and coextruded onto a cast drum cooled from a die, and processed into a sheet shape. Method (co-extrusion method), thermoplastic resin for molding on a support made from a single film, melt extrusion and lamination while extruding from the die (melt lamination method), support and thermoplastic for molding A sheet made of resin is produced separately for each film, and a method of thermocompression bonding with a heated group of rolls (thermal laminating method), other sheet forming materials are dissolved in a solvent, and the solution is placed on the sheet. Examples of the method include a coating method (coating method).

  A manufacturing apparatus for realizing the method for manufacturing a fine shape transfer sheet of the present invention will be specifically described below with reference to the drawings. FIG. 3 shows a schematic cross-sectional view of an example of the apparatus for producing a fine shape transfer sheet according to the present invention, in the case where a film is used as a sheet-like resin base material, as viewed from the film width direction.

  As shown in FIG. 3, the fine shape transfer sheet manufacturing apparatus 1 of the present invention includes a press unit 10, a release unit 20, a heater unit 30, a cooling unit 40, an unwinding unit 50, and a winding unit 60. Consists of The film 2 wound in a roll shape by the unwinding unit 50 is unwound, the fine shape of the mold 3 of the present invention is transferred and formed by the press unit 10, and is wound in a roll shape by the winding unit 60. . The unwinding unit 50 and the winding unit 60 are the above-described film transport devices. The press unit 10 is connected to the press cylinder 12 so that the pressure plate (upper) 14a can be moved up and down using the support column 11 as a guide. The support column 11 is disposed so as to be sandwiched between the frame (upper) 16a and the frame (lower) 16b. A temperature control plate (upper) 15a is attached to the lower surface of the pressure plate (upper) 14a. On the other hand, a temperature control plate (lower) 15b serving as a metal substrate in the present invention is attached to the upper surface of the pressure plate (lower) 14b. A heating unit 30 and a cooling unit 40 are connected to each temperature control plate via piping, wiring, and the like. The plurality of mold pieces 4 are attached to the upper surface of the temperature control plate (lower) 15b with an adhesive 5 and are controlled to be heated and cooled via the lower temperature control plate. The temperature control plate (upper) 15a functions as a plate plate according to the present invention.

  Next, a series of film forming operations by the fine shape transfer sheet manufacturing apparatus 1 will be described. 4 and 5 are schematic cross-sectional views of the operation of intermittently forming a roll-shaped continuous film using the apparatus of the present invention as seen from the film width direction, and the processes (A) to (K) described below. It is formed by the flow of.

  (A) After setting the mold 3 in the press unit 10 in advance, the film 2 is set in the unwinding unit 50, the unwinding part of the film 2 is pulled out, and the mold in the press unit is passed through the guide roll. It winds with the winding unit 60 along the surface and further via the mold release unit 20 (refer Fig.4 (a)).

  (B) Next, the heating unit is operated to raise both the temperature control plate (upper) 15a and the temperature control plate (lower) 15b to the molding temperature.

  (C) The press unit 10 is operated to lower the temperature control plate (upper) 15 a and press the film 3 so as to sandwich the film between the surface of the mold 3 and the buffer material 17. At this time, the film fixing portions 54 and 65 are operated to fix the film. Conditions such as temperature, press pressure increase speed, and pressurization time depend on the film material, the transfer shape, particularly the aspect ratio of the unevenness. In general, the molding temperature is set to 100 to 180 ° C., the press pressure is set to 1 to 10 MPa, the molding time is set to 1 to 60 seconds, and the pressurization speed is set in the range of 0.05 MPa / s to 1 MPa / s (FIG. 4B). reference).

  (D) After completing the press while heating, the cooling unit is operated to lower the temperature of the temperature control plate (upper) 15a and the temperature control plate (lower) 15b. In addition, it is preferable that pressurization is continued during cooling. The cooling temperature is set so that the temperature on the mold surface is sufficiently cooled to release the film. For example, the surface temperature of the mold 3 is preferably cooled to a glass transition point or less of the film.

  (E) After the cooling is completed, the press pressure is released, and the temperature control plate (upper) 15a is raised to a position where a sufficient space can be secured for the release unit 20 to move horizontally in the press device (FIG. 4 ( c)).

  (F) After the temperature control plate (upper) 15a completes the rise, the film fixing portion 65 is opened, the auxiliary roll turning means is driven, and the auxiliary roll 22 is swung to the upper part of the peeling roll 21, The film 2 is held by the peeling roll 21 and the auxiliary roll 22 (see FIG. 4D).

  (G) Then, the peeling roll 21 is rotated in the direction of 23a on the film surface. The peeling roll 21 moves in the direction of 23b simultaneously with the rotation by the frictional force with the film surface. The movement is performed while being guided by a linear motion guide of the peeling roll provided on the pressure plate of the press device. At this time, the film that is in close contact with the mold surface is satisfactorily released (see FIG. 5E).

  (H) When peeling to the unwinding side end of the mold 3 is completed, the rotation of the peeling roll is stopped (see FIG. 5F).

  (I) After that, the brake is applied so that the peeling roll does not rotate, the film fixing portion 54 is opened, and the conveyance driving roll 64 is rotated, so that the peeling roll 21 and the auxiliary roll 22 remain in a relative position. Move to the winding side. At this time, a new film is pulled out from the unwinding side, and the formed film is sent out to the winding side (see FIG. 5G).

  (J) When the drawing of the film is finished, the film is fixed by the film fixing unit 54, and then the auxiliary roll is turned back to the original position, and the film is fixed by the film fixing unit 65. When a new film is supplied, the film that has been loosened in advance in the draw buffer unit 53 is drawn to the take-up side. However, the unwinding roll rotating means is operated to the position where the film is detected by the sensor 57b, and the roll is wound. A new film is supplied to the drawing buffer unit from the roll. On the other hand, when the film that has been formed is sent out, the film corresponding to the sent-out length is temporarily held in the take-up buffer unit 63 and accumulated until the film is no longer detected by the sensor 68a. The film corresponding to the length of the minute is wound by operating the winding roll rotating means (see FIG. 5H).

  (K) Heating of the temperature control plate (upper) (lower) is started at the same time as or after the release of the film is completed. Then, the press unit 10 is operated to lower the temperature control plate (upper) to the vicinity of the upper surface of the film.

  After the temperature rise is completed, press molding is performed, and the above-described operation from (C) is repeated.

  By the operations (F) to (H) described above, a smooth release operation can be incorporated into the intermittent film forming cycle, and a high-quality formed film with few release marks can be produced.

  Moreover, the film to be formed in the next cycle can be quickly supplied into the press unit by the operation (I), so that intermittent film formation can be realized with high productivity. By combining the release operation and supply operation of both films, a high-quality molded film can be produced with high productivity.

(1) Measuring method of formability Using a laser microscope (VK9700 manufactured by Keyence Corporation), the forming cross section of the fine shape transfer film after forming was observed at 1000 times or 3000 times, and the forming height was measured. As shown in FIG. 6, 20 points A to T were measured for each sample, and an average value of measured values measured for 3 samples was defined as a formability value. FIG. 6 (1) shows the present invention in which each of a plurality of mold pieces having fine irregularities formed on one side is fixed on a metal substrate that also serves as a temperature control plate with an adhesive. (2) is a large-size copper material having fine irregularities formed on the entire surface on the same metal substrate.

[Example 1]
(1) Size per die piece: 80 mm (film width direction) × 50 mm (film running direction) × 0.3 mm (thickness).
(2) Mold piece material: Nickel (electroformed mold)
(3) Fine irregular shape: A prism having a pitch of 25 μm and a depth of 12.5 μm and a cross section when viewed from the film running direction was used.
(4) Press device: It can pressurize up to 3000 kN, and pressurization is performed by a hydraulic pump. Two temperature control plates (metal substrates) made of an aluminum alloy and having a size of 700 mm (film width direction) × 1000 mm (film running direction) are attached to the inside of the press device, and are connected to a heating device and a cooling device, respectively. ing. The mold piece is attached to the upper surface of the lower temperature control plate with the adhesive No. 5919 (manufactured by Nitto Denko Corporation, pressure-sensitive adhesive thickness 50 μm) is applied and attached as shown in FIG. The heating device is a heat medium circulation device, and the heat medium is Barrel Therm # 400 (manufactured by Matsumura Oil Co., Ltd.), which is heated to 150 ° C. and flows at a flow rate of 100 L / min. Moreover, a cooling device is a cooling water circulation device, and flows the water cooled at 20 degreeC with the flow volume of 150 L / min.
(5) Buffer material: A composite sheet (model number: F200, manufactured by Kinyo Co., Ltd.) composed of an intermediate base material of a heat-resistant base fabric having a thickness of 2.0 mm and fluororubber laminated on both sides of the intermediate base material is prepared. did. A fluororesin film (model number: Toyoflon F100, manufactured by Toray Film Processing Co., Ltd.) having a thickness of 100 μm was laminated on one side of this composite sheet to obtain a cushioning material. This cushioning material was attached to the upper temperature control plate with the surface opposite to the fluororesin film surface facing.
(6) Mold release apparatus: A combination of a peeling roll and an auxiliary roll having the same configuration as that shown in FIG. 3 was used.
(7) Sheet-like resin base material: thickness is 120 μm, layer structure is a two-layer structure (molding layer: low melting point polyethylene terephthalate (glass transition point: 75 ° C.) 40 μm, support layer: polyethylene terephthalate 80 μm).
(8) Operation method: Using the above-mentioned apparatus, molding was performed intermittently as follows. In advance, the film is passed from the unwinding device to the winding device via a press device. Next, after the temperature control plate is heated to 110 ° C. both in the upper and lower directions, the upper plate is lowered and the film pressing is started. The pressing was performed at 7 MPa on the mold surface for 30 seconds. Thereafter, the temperature control plate is cooled both top and bottom while the press is continued. Cooling is stopped when each temperature control plate reaches 60 ° C. When the cooling is completed for both the upper and lower sides, the press is released. The upper plate is raised to the upper limit, and the release device is driven to release the film.
(9) The above operation was repeated to produce a fine shape transfer film. As a result of visual evaluation of the created fine shape, the entire surface was uniformly transferred. As a result of confirming the moldability of the fine shape transfer film, the molding height was 12.2 μm.

[Example 2]
The mold is attached to the upper surface of the lower temperature control plate (metal substrate) with an adhesive no. 5919 (manufactured by Nitto Denko Co., Ltd., adhesive thickness 50 μm) is installed, and an elastic body (manufactured by Toray DuPont Co., Ltd.) is formed in the hollow portion made of the lower temperature control plate, mold piece and adhesive. Evaluation was performed in the same manner as in Example 1 except that Kapton 100V, thickness 25 μm) was installed.
(1) As a result of visually evaluating the fine shape of the produced fine shape transfer film, the entire surface was in a uniform transfer state. As a result of confirming the moldability of the fine shape transfer film, the molding height was 12.3 μm.

[Comparative Example 1]
Evaluation was performed in the same manner as in Example 1 except that no buffer material was used.
(1) As a result of visual evaluation of the fine shape of the produced fine shape transfer film, there was a transfer unevenness on the entire surface. As a result of confirming the moldability of the fine shape transfer film, the molding height was 11.9 μm for the good molding part and 7.5 μm for the poor molding part.

[Reference example]
As shown in FIG. 6 (2), evaluation was performed in the same manner as in Example 1 except that a metal mold was provided with a copper material having a fine shape formed on the entire surface of a metal substrate.
(1) Size per die: 500 mm (film width direction) × 800 mm (film running direction) × 20 mm (thickness).
(2) Mold material: Copper (3) Fine shape: pitch 25 μm, depth 12.5 μm, and a prism-shaped cross section when viewed from the film running direction was used.
(4) Press device: It can pressurize up to 3000 kN, and pressurization is performed by a hydraulic pump. Two temperature control plates (metal substrates) made of an aluminum alloy and having a size of 700 mm (film width direction) × 1000 mm (film running direction) are attached to the inside of the press device, and are connected to a heating device and a cooling device, respectively. ing. The mold is attached to the upper surface of the lower temperature control plate. The heating device is a heat medium circulation device, and the heat medium is Barrel Therm # 400 (manufactured by Matsumura Oil Co., Ltd.), which is heated to 150 ° C. and flows at a flow rate of 100 L / min. Moreover, a cooling device is a cooling water circulation device, and flows the water cooled at 20 degreeC with the flow volume of 150 L / min.
(5) The above operation was repeated to produce a fine shape transfer film. As a result of visual evaluation of the created fine shape, the entire surface was uniformly transferred. As a result of confirming the moldability of the fine shape transfer film, the molding height was 12.3 μm.

It is a schematic cross-sectional perspective view of the metal mold | die with which the some metal mold | die piece in which the fine uneven | corrugated shape was formed in the single side | surface is fixed on the board | substrate with the adhesive. It is a schematic cross section at the time of installing an elastic body in the cavity part enclosed with the metal mold | die piece, the adhesive, and the board | substrate. It is the schematic sectional drawing which looked at the manufacturing apparatus of the fine shape transfer sheet of this invention from the film width direction in the case of using a film as a sheet-like resin base material. It is the schematic sectional drawing which looked at the operation | movement which intermittently forms a roll-shaped continuous film using the apparatus of this invention shown in FIG. 3 from the film width direction. FIG. 4 is a schematic cross-sectional view of the operation of intermittently forming a roll-shaped continuous film using the apparatus of the present invention shown in FIG. 3 as viewed from the film width direction, and shows the downstream operation following the operation shown in FIG. 4. It is a thing. Measurement point of formability of fine shape transfer sheet. FIG. 6 (1) shows a case where a plurality of mold pieces each having a fine uneven shape formed on one side are fixed on a metal substrate that also serves as a temperature control plate by an adhesive. FIG. 6 (2) shows a case where a large-sized copper material having a fine shape formed on the entire surface is installed on the same metal substrate.

Explanation of symbols

1: Manufacturing apparatus for fine shape transfer sheet 2: Sheet-like resin base material 3: Mold 4: Mold piece 5 having fine irregularities formed on one side 5: Adhesive 6: Elastic body 10: Press unit 11: Support column 12: Press cylinder 13: Elevating guide 14a, b: Pressure plate (upper), (lower)
15a, b: Substrate [Plate plate (temperature control plate) (upper), (lower)]
16: Frame 17: Buffer material 20: Release unit 21: Release roll 22: Auxiliary roll 30: Heater unit 40: Cooling unit 50: Unwind unit 51: Unwinding roll rotating means 52a to d: Guide roll 53: Pull-out buffer Unit 54: film fixing unit 55: box 56: suction / exhaust means 57a, b: sensor 60: take-up unit 61: take-up roll rotating means 62a to d: guide roll 63: take-up buffer unit 64: transport drive roll 65: Film fixing part 66: box 67: suction / exhaust means 68a, b: sensor

Claims (2)

A mold composed of a plurality of mold pieces each having a fine concavo-convex shape formed on one side;
Cushioning material,
An apparatus for producing a fine shape transfer sheet, including a plate for pressing the cushioning material toward the mold,
The mold is obtained by fixing the plurality of mold pieces on a substrate via an adhesive, and the adhesive is a surface opposite to the surface on which the fine uneven shape of the mold piece is formed. The manufacturing apparatus of the fine shape transfer sheet | seat adhere | attached only on the edge part.   The apparatus for producing a fine shape transfer sheet according to claim 1, wherein an elastic body is provided in a cavity surrounded by the mold piece, the adhesive, and the substrate.

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