JP4116314B2 - Manufacturing method of micro embossed sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a method for producing a micro-embossed sheetTo the lawRelated.
[0002]
[Background]
Conventionally, a sheet in which a micro emboss pattern is formed on one surface of a thermoplastic resin sheet is useful as a lens functional sheet such as a Fresnel lens sheet, a lenticular lens sheet, and a prism lens sheet. For example, retroreflective sheets (plastic reflectors) that have been subjected to microprism processing have been used in the fields of reflectors, fashion, architecture, and the like.
[0003]
As such a retroreflective sheet, a glass bead type and a cube corner type are used. In general, the cube corner type is superior in long-distance visibility and reflection luminance compared to the glass bead type. In the production of the cube corner type retroreflective sheet, the emboss pattern of the mold for forming the emboss pattern must be transferred to the thermoplastic resin sheet.
For that purpose, it is particularly important that the thermoplastic resin sheet is pressed at an appropriate temperature and pressure against the emboss pattern forming mold.
[0004]
As a method for forming an emboss pattern on a thermoplastic resin sheet, as shown in Japanese Patent Publication No. 55-21321, a metal micro-embossed plate and a thermoplastic resin are heated with a flat plate press equipped with a heating and cooling mechanism. A method is widely known in which after pressurization, it is cooled and solidified as it is, and then peeled off.
[0005]
As other methods, as disclosed in JP-A-51-135962, an embossed pattern is formed on an embossed plate belt, and the embossed pattern is transferred to a sheet as a transfer object. As shown in Japanese Patent Publication No. 3-43051, there is known a method of using an embossed pattern formed on the surface of a cylindrical metal roll as an embossing plate at the time of transfer, and transferring the embossed pattern to a sheet as a transfer product. ing.
[0006]
Further, as another method, as described in JP-A-2000-167926, an embossed material having an embossed pattern and an embossed material inserted between a heating roll and a flat plate are inserted. A method of forming an emboss pattern on the substrate, and an intermediate material having an elastic layer between a forming roller and a base plate, an original fabric sheet, and a predetermined emboss as described in JP-A-2000-292610 Examples thereof include a manufacturing method in which a stamper having a pattern is inserted to form an embossed pattern on a raw sheet.
[0007]
[Problems to be solved by the invention]
However, the method using a flat plate press has a problem that continuous transfer cannot be performed. Further, since pressurization is performed using a flat plate press, it is difficult to remove the air interposed between the embossed plate and the sheet, and the remaining air is precise. There was a problem of preventing the transfer.
In the belt method, since the belt is used as a plate for transfer, continuous transfer is possible, but it is difficult to form a fine emboss pattern on the belt, and the durability of the belt is low. is there.
Furthermore, with the roll method, continuous transfer and precise emboss pattern transfer can be performed, but since the emboss pattern is formed on a metal plate and the metal plate is processed into a cylindrical shape, the cost of the apparatus is high. There was a problem that the replacement cost when the metal plate of the roll was damaged also increased.
In the technique described in Japanese Patent Laid-Open No. 2000-167926 and Japanese Patent Laid-Open No. 2000-292610, an emboss pattern can be formed on a sheet only within the size range of an embossed plate arranged on a flat plate. For example, there is also a problem that an embossed pattern cannot be continuously formed on a long sheet, and an embossed sheet cannot be manufactured continuously.
[0008]
An object of the present invention is to provide a method for manufacturing a micro-embossed sheet and a micro-embossed sheet which can transfer a precise embossed pattern with certainty, enable continuous transfer of the embossed pattern, and are low in cost of the apparatus.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a method for producing a micro-embossed sheet according to the present invention is a method for producing a micro-embossed sheet having a fine embossed pattern, and is a sheet to be transferred on the surface of an embossed plate on which the embossed pattern is formed. A transfer step in which a pair of rolls are disposed on the front and back sides of the embossed plate, the embossed plate and the transfer target sheet are sandwiched between the pair of rolls, and an emboss pattern is transferred to the transfer sheet; A transfer step of transferring the embossed plate and the transferred sheet after transfer by an endless belt wound around at least one of the pair of rolls; and after the transfer step, the transferred sheet is transferred to the embossed sheet Peeling process for peeling off the plate After the transferring step, peeling off the transfer sheet from the embossing plate. Characterized in that it comprises a step.
[0010]
Here, the emboss pattern refers to a pattern made by compression processing in press processing. In particular, the micro-emboss means that the unevenness of the structure has a height difference of several tens to several hundreds of μm, and the surface roughness Ra (defined by JIS B 0601) of the component surface is 2 μm or less. For optical applications, Ra is preferably accurate to 0.1 μm or less. In the case of a cube corner prism for retroreflection, a triangular pyramid composed of three right-angled triangles and one acute-angled triangle, that is, an angle between the right-angled triangles of 90 ° and a pyramid-shaped triangular pyramid on the bottom of the acute-angled triangle. It has a spread shape. The size is several tens of μm to several hundreds of μm on the bottom. As an example, in the case of an equilateral triangular pyramid structure with a bottom surface of 200 μm on a side, the height is 81.6 μm.
[0011]
The embossed plate is a template on which an embossed pattern is formed. The material conditions of the embossed plate are: excellent heat transfer, sufficient hardness, sufficient heat resistance, high durability, easy processing, excellent cost, emboss pattern The transfer accuracy can be sufficiently obtained. As a material satisfying the above conditions, the material of the embossing plate is preferably a metal, and among them, electroformed nickel is particularly preferable.
[0012]
Furthermore, the thickness of the embossed plate is preferably 0.1 to 4 mm, more preferably 0.3 to 0.8 mm. If the embossed plate is thinner than 0.1 mm, there will be a problem with durability and ease of handling. If the embossed plate is thicker than 4 mm, the heat transfer will be worse and the energy loss of heating / cooling will be reduced. May occur and reduce productivity.
[0013]
And the magnitude | size of an embossing plate changes with uses. For example, when the embossed plate is continuously supplied, it is sufficient that there is no defect such as a gap at the joint between the embossed plate and the embossed plate. The embossed plate is basically a rectangular plate. From the viewpoint of the operation of the embossed plate, the appearance and size required for the final product, and the cost of the embossed plate alone, the length in the traveling direction of the embossed plate is suitably 3 to 100 cm. More preferably, the length of the embossing plate in the traveling direction is 10 to 40 cm.
[0014]
Moreover, it is preferable to use a roll provided with the function of a pressurization and a heating in order to transfer an embossing pattern to a to-be-transferred sheet as a pair of roll.
Here, the material and internal structure of the roll preferably have a rigidity that does not lose against the pressure during pressurization, and are appropriately selected in consideration of the cost of the roll. In particular, it is preferable that one of the rolls has a metal surface having a heating function and the other has a roll having an elastically deformed surface for obtaining a pressure zone. Further, the roll diameter needs to be balanced so that the bending stress of the embossed plate is reduced by the clamping pressure. Since the transfer speed can be increased by taking a sufficient pressure section, it is desirable that the roll has a larger diameter. However, if it is too large, the entire apparatus becomes large, leading to an increase in cost. Therefore, an appropriate selection is made in consideration of the cost.
[0015]
As the surface material and structure of the roll having an elastic deformation surface, an elastic material excellent in heat resistance, for example, silicon rubber or Teflon (registered trademark) rubber is desirable. As the hardness of the rubber, a value measured by a method based on JIS K6301 A type is 50 to 98 degrees, preferably 70 to 98 degrees. The surface structure of the pressure roll needs to maintain a level of flatness that does not deteriorate the surface state of the sheet after transfer.
[0016]
The composition of the transfer sheet may be any material having thermoplasticity. It is not necessarily limited to a synthetic resin. Moreover, as long as the transfer surface is a thermoplastic having a sufficient thickness, a single layer or a multi-layer may be used. Furthermore, in the case of optical applications such as a retroreflective sheet, sufficient transparency, refractive index, and birefringence are required.
As a material satisfying the above conditions, specifically, as a thermoplastic resin, PE (polyethylene), PP (polypropylene), PC (polycarbonate), PVC (polyvinyl chloride), PMMA (polymethyl methacrylate) EMMA (ethylene-methyl methacrylate copolymer) or the like can be used.
[0017]
Further, the thickness of the transfer sheet is appropriately selected from the use (resin type, product rigidity) and the embossed shape. As specific conditions, 0.02 to 50 mm is preferable. If the thickness is less than 0.02 mm, the transfer sheet may be broken when the transfer sheet is peeled off. If it is thicker than 50 mm, there is a problem that energy loss occurs in heating / cooling of the transfer sheet and productivity is lowered, and the stress load applied to the embossing plate at the time of peeling of the transfer sheet increases. There is a risk that the risk of damaging the plate increases. Furthermore, in optical applications, the completed embossed sheet is required to have sufficient transparency, refractive index, and birefringence, so the conditions become narrower. Specifically, when the embossing height of the embossing pattern is 70 μm, the thickness of the transferred sheet is preferably 0.10 to 0.60 mm, and more preferably 0.15 to 0.30 mm.
[0018]
Here, the endless belt refers to a belt having no end, and specifically includes, for example, a belt wound around two or more rolls.
The endless belt is preferably made of a material having excellent heat resistance, thermal conductivity, and durability. Moreover, as the shape, a width | variety and a perimeter can be suitably selected according to the magnitude | size etc. of the embossing plate to be used. Furthermore, the thickness is appropriately selected in consideration of durability and thermal conductivity. Practically, the thickness is 0.05 to 2.00 mm, preferably 0.30 to 0.70 mm.
[0019]
And in a peeling process, in order to make a to-be-transferred sheet peel from an embossed plate, you may provide a cooling roll and a peeling roll. The peeling roll may be a metal roll or a roll using an elastic material. As the elastic material, for example, silicon rubber or Teflon (registered trademark) rubber is desirable. Also, a metal roll coated with silicon rubber or the like can be employed.
In addition, the sheet | seat in this invention includes the case of a relatively thin film.
[0020]
According to the present invention, the embossed plate and the sheet to be transferred are inserted between the rolls via the endless belt, and the embossed pattern is transferred by clamping, so that the continuous transfer of the embossed pattern is also possible. Is possible.
Also, compared to the method of transferring the embossed pattern with a roll formed with the same width and area of the embossed pattern, the embossed pattern is transferred using multiple embossed plates, thereby reducing the risk of damage to the embossed plate. As a result, the cost of the apparatus can be reduced.
Furthermore, when transferring the embossed pattern, the embossing plate and the transferred sheet are pressed with a roll, so the air between the embossed surface of the embossed plate and the transferred sheet is handled, so that the precise embossed pattern is transferred reliably. can do.
Then, since the embossing plate is moved using the endless belt in the conveying step, the embossing plate can be continuously and stably moved, so that the embossed pattern can be continuously transferred stably.
[0021]
  In the method for producing a micro-embossed sheet according to the present invention,And a cooling step of cooling and solidifying the embossed plate and the transfer sheet in close contact with each other after the transfer step, and after the cooling step, the peeling step is performed..
  Here, in the cooling step, a method of leaving a heated transfer sheet or the like at room temperature can be employed. In addition, there is a method of forcibly cooling from the outside, such as pinching with a cooling roll and blowing cold air. Moreover, in order to improve the adhesiveness of an embossing plate and a to-be-transferred sheet, the method of pinching with an aluminum plate etc. is also mentioned.
  According to this, since it has a cooling step, it can be cooled and solidified in a state where the embossed plate and the transfer sheet are kept in close contact with each other, so that there is no distortion of the emboss pattern at the time of transfer. Can be obtained.
[0022]
Moreover, it is preferable that the said cooling process is implemented by the cooling means provided in the conveyance process by the said endless belt.
According to this, since the cooling means is provided in the conveying process, the conveying step can be simultaneously performed by the endless belt and the cooling step can be simultaneously performed by the cooling roll, so that the micro embossed sheet can be manufactured without any structural waste.
[0023]
Furthermore, it is preferable that the cooling means includes a cooling roll that is disposed apart from one of the pair of rolls and on which the endless belt is wound.
According to this, since the cooling means includes the cooling roll around which the endless belt is wound, since the conveyance and the cooling can be performed at the same time, there is an effect that the production line does not become longer than necessary.
[0024]
And it is preferable that the said cooling means is equipped with the 2nd cooling roll arrange | positioned between said one roll and said cooling roll.
Here, the second cooling roll refers to a roll having a cooling function other than the cooling roll.
According to this, by providing the second cooling roll, it functions as a support for the endless belt, and further, the embossed plate and the like are sufficiently cooled to reach the cooling roll side. It can contribute to solidification.
[0025]
Further, it is preferable that the cooling unit includes a cooling air spray mechanism that blows cooling air from the transfer sheet side.
Here, any cooling air blowing mechanism may be employed as long as it blows air. Specifically, it is an air blower, a mist blower, or the like.
According to this, since the transfer sheet can be directly cooled by including the cooling air spray mechanism, the transfer sheet and the like are sufficiently cooled before reaching the cooling roll side. Can be cooled and solidified quickly.
[0026]
In the cooling step, the embossed plate is preferably cooled and solidified in a substantially flat state.
According to this, in the cooling step, the transferred emboss pattern is cooled and solidified, and the emboss pattern is fixed, so that a precise emboss pattern can be formed.
[0027]
Furthermore, it is preferable that the cooling step cools the transfer sheet to the softening point or less.
According to this, since the transferred sheet is cooled below its softening point in the cooling step, the transferred sheet can be solidified reliably.
[0028]
The material of the endless belt is preferably a metal.
Here, the material of the endless belt is required to be excellent in heat resistance, thermal conductivity, and durability, and metal is preferable in consideration of cost. Specific examples include stainless steel, carbon steel, and titanium alloys.
According to this, since the material of the endless belt is a metal, the metal is excellent in heat resistance, thermal conductivity, and durability. Therefore, the endless belt is excellent in heat resistance, thermal conductivity, and durability. can do.
[0029]
Further, the transfer sheet may be supplied between a pair of rolls so as to contact the endless belt, and the contact surface of the endless belt may be a mirror surface.
According to this, when the endless belt contacts the opposite side of the embossed surface of the transferred sheet during the transfer process, the surface of the endless belt is a mirror surface. Gloss or the like can be imparted.
[0030]
Furthermore, the transfer sheet may be supplied between a pair of rolls so as to contact the endless belt, and the contact surface of the endless belt may be a rough surface.
According to this, since the surface of the endless belt is rough during the transfer process, the friction is large when the embossed plate comes into contact with the endless belt, so that the embossed plate can be reliably moved during the conveying process. Can do.
[0031]
Then, the transfer sheet may be supplied between a pair of rolls so as to abut the endless belt, and the abutment surface of the endless belt may be coated with a heat-resistant peelable resin.
Here, the heat-resistant peelable resin refers to a resin that has heat resistance and that can be easily peeled after the resin surface comes into contact with the transfer sheet. Specifically, a polyimide is mentioned.
According to this, when the endless belt is in contact with the transfer sheet during the transfer process, the surface of the endless belt is coated with the heat-resistant release resin, so that the peelability is good. Peeling from the contact surface of the belt can be easily performed.
[0032]
Moreover, it is preferable that at least one roll is a heating roll among a pair of rolls used at the said transfer process.
Here, as the heating roll, one provided with an electric heater or an IH structure inside the roll can be adopted. Furthermore, a heating roll such as flowing heated oil or the like into the roll can also be employed.
According to this, since pressurization and heating can be simultaneously performed on the transfer sheet and the emboss plate, the emboss pattern can be reliably transferred to the transfer sheet.
[0033]
Furthermore, it is preferable that the embossed plate is disposed on the heating roll side.
According to this, since the embossing plate is disposed on the heating roll side, the embossing plate can be efficiently heated, so that the transfer sheet is softened and the embossing pattern is easily transferred via the embossing plate. can do.
[0034]
Further, it is preferable that the transfer step is performed in a substantially flat state by sandwiching the embossed plate and the transfer sheet.
According to this, since the embossing plate and the transfer sheet are sandwiched and pressed in a substantially flat state, the emboss pattern can be accurately transferred.
[0035]
It is preferable that at least one of the pair of rolls has an elastic body.
According to this, since the surface of the roll is made of an elastic body, a large pressing area on the surface of the roll can be taken, so that transferability can be improved.
[0036]
In the transfer step, it is preferable that the transfer sheet is heated to the softening point or higher when the embossed plate and the transfer sheet are sandwiched.
According to this, when the embossed plate and the transfer sheet are sandwiched, the transfer sheet is heated to the softening point or higher, so that the transfer sheet can be made flexible before transfer. The emboss pattern can be transferred to the transfer sheet.
[0037]
And it is preferable that the linear pressure at the time of pinching the embossing plate and a to-be-transferred sheet in the said transfer process is 50 N / cm or more.
According to this, when the linear pressure is 50 N / cm or more, the embossed plate and the transfer sheet can be sufficiently clamped, so that the emboss pattern can be accurately transferred.
[0038]
Further, in the transfer step, it is preferable that the mirror surface member having a mirror surface processed on the surface to be contacted with the transfer sheet is overlapped and pressed.
Here, as a characteristic required for the mirror member, heat resistance is required so as not to melt or deform during heating. Further, flatness sufficient to impart flatness, gloss, etc. is required as surface characteristics. For example, as the mirror member, a thermoplastic resin film, an aluminum foil, or the like that is not welded to the transfer sheet can be employed.
According to this, specular gloss or the like can be imparted to the opposite side of the embossed surface of the transfer sheet.
[0039]
Furthermore, in the transfer step, it is preferable to superimpose a mirror film or sheet having a mirror surface on the transfer sheet.
Here, as the characteristics required for the mirror film or sheet, heat resistance to the extent that it does not melt or deform during heating is required, as in the case of the mirror member. Further, flatness sufficient to impart flatness, gloss, etc. is required as surface characteristics. For example, a resin film or sheet such as PET (polyethylene terephthalate) or polyimide can be employed.
According to this, specular gloss or the like can be imparted to the opposite side of the embossed surface of the transfer sheet.
[0040]
In the transfer step, it is preferable to sandwich the elastic member between the transfer sheet and the roll.
According to this, since the elastic member has elasticity, it is possible to sufficiently transmit the pressure applied during transfer to the transfer sheet.
[0041]
Moreover, it is preferable that the said endless belt is wound by the said heating roll.
According to this, since the endless belt can transmit the heat from the heating roll, a section for heating the embossed plate or the transfer sheet can be made long.
[0042]
Moreover, it is preferable to have the plate heating process which heats an embossing plate previously before the said transfer process.
Here, as a heating means for heating the embossed plate in advance in the plate heating step, a means for heating from the outside of the roll with a radiant electric heater, hot air, flame or the like can be employed.
According to this, since the embossing plate also has heat in advance by having the plate heating step, the transfer sheet is heated from both sides of the embossing plate and the heating roll, and the transfer sheet is made flexible before transfer. Therefore, the emboss pattern can be efficiently transferred onto the transfer sheet.
[0043]
Furthermore, a sheet heating step for heating the transfer sheet in advance may be provided before the transfer step.
Here, as the heating means for preheating the transfer sheet in the sheet heating step, in the same way as in the plate heating step, in addition to the heating roll, a radiant electric heater, hot air, flame, etc. from outside the roll It is possible to employ a heating means.
[0044]
Further, the transfer sheet is preferably made of a thermoplastic resin. According to this, since the sheet to be transferred has thermoplasticity, the emboss pattern can be easily transferred by heating and pressurizing at the time of transfer.
[0045]
The transfer sheet is preferably continuous long.
According to this, since the completed micro-embossed sheet becomes a continuous long shape, a method of winding on a roll or the like at the time of storage can be adopted, so that storage, transportation, and the like can be easily performed.
[0046]
The embossed plate is preferably made of metal.
According to this, since the embossed plate is made of metal, it is excellent in heat transfer and can process the embossed pattern with high accuracy, so the embossed plate can easily transfer heat during heating, and easily An embossed plate having an embossed pattern can be produced.
[0047]
Furthermore, the embossed plate may be disposed at a position where it comes into contact with the endless belt.
According to this, since an endless belt can transmit the heat from a heating roll, the area to heat can be lengthened.
[0048]
And you may arrange | position in the position which does not contact | abut with the said endless belt.
According to this, since the embossed plate is arranged at a position where it does not come into contact with any endless belt, the embossed plate is sandwiched between the rolls, and therefore exists between the embossed plate and the transfer sheet. The air can be swept out.
[0049]
And it is preferable that the said embossing plate is equipped with a concave cube corner type embossing pattern.
According to this, since the completed micro embossed sheet is provided with a cube corner type embossed pattern, a micro embossed sheet excellent in retroreflectivity can be manufactured.
[0050]
In the transfer step, the embossed plate is preferably continuously supplied between the pair of rolls.
For example, there may be mentioned a method in which the embossed plate used for the transfer once in the transfer step is sent again to the supply side.
According to this, since the embossing pattern can be continuously transferred by the embossing plate by continuously supplying the embossing plate between the pair of rolls, the microembossed sheet can be continuously manufactured.
[0052]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 shows a manufacturing apparatus 1 according to the first embodiment of the present invention.
[0053]
The manufacturing apparatus 1 used in this manufacturing method includes a work table 12, a heating roll 17, a cooling roll 23, and a roll 28 arranged so as to be positioned at each vertex of a substantially triangular shape, and these three rolls 17, 23, 28, an endless belt 19, a supply roll 14, a supply roll 16, a pressure roll 18, an embossing plate 10, six second cooling rolls 33, and four air blowers 25. And a peeling roll 21 and a take-up roll 22.
[0054]
Here, the embossing plate 10 is inserted between the heating roll 17 and the pressure roll 18, and the material of the embossing plate 10 is electroformed nickel. In addition, a cube corner type emboss pattern is formed on the surface of the emboss plate 10 in contact with the transfer sheet 13.
In addition, the work table 12 includes a plurality of feed rollers 11, and the feed rollers 11 may be connected to a rotation driving means such as a motor in order to feed the embossed plate 10 to the rolls 17 and 18 side.
Further, the transfer sheet 13 is supplied from a supply roll 14, and the transfer sheet 13 is a sheet mainly made of a thermoplastic resin. Examples of the material include PE (polyethylene), PP (polypropylene), PC (polycarbonate), PVC (polyvinyl chloride), PMMA (polymethyl methacrylate), EMMA (ethylene-methyl methacrylate copolymer), and the like. Can be adopted.
[0055]
Further, the specular sheet 15 is supplied from a supply roll 16, and the specular sheet 15 is a sheet having a specular surface. The mirror sheet 15 is, for example, a resin film or sheet such as PET (polyethylene terephthalate) or polyimide.
And the material of the surface of the heating roll 17 is metal materials, such as chrome. Moreover, as a heating method of the heating roll 17, for example, an electric heater or an IH structure is provided in the heating roll 17, or heated oil or the like is flowed into the heating roll 17.
[0056]
Here, the pressure roll 18 is disposed above the heating roll 17 with the endless belt 19 interposed therebetween. Further, the pressure roll 18 may be a roll made of silicon rubber or Teflon (registered trademark) excellent in heat resistance.
Further, at least one of the heating roll 17 and the pressure roll 18 is connected to a rotation driving means such as a motor.
Furthermore, between the heating roll 17 and the cooling roll 23, six second cooling rolls 33 for cooling the embossed plate 10 from the inside of the endless belt 19 are provided. These cooling rolls 23 and 33 have a structure that can be cooled by circulating water at 15 ° C. circulating inside.
[0057]
The endless belt 19 is made of metal, and stainless steel is adopted in the present embodiment. Moreover, the surface is mirror-finished.
The embossing plate 10, the transfer sheet 13 and the mirror sheet 15 that are inserted between the heating roll 17 and the pressure roll 18 are provided between the pressure roll 18 and the peeling roll 21, and the embossing plate is provided from the outside of the endless belt 19. Cooled by four air blowers 25 that cool 10. Any air blower 25 can be used as long as it has a structure for sending air.
[0058]
Moreover, the peeling roll 21 peels the completed micro embossing sheet 20 from the embossing plate 10, and is a roll made from silicon rubber.
Furthermore, the supply rolls 14 and 16, the winding roll 22 and the roll 28 for winding the micro-embossed sheet 20 may be any members as long as they achieve the purpose of winding the sheet and rotating the endless belt 19. Can be adopted.
The operating conditions of the apparatus are as follows as a guide when the transfer speed is 0.2 to 1.0 m / min.
Linear pressure applied between the heating roll 17 and the pressure roll 18: 50 to 1000 N / cm (more preferably 300 to 500 N / cm)
Transfer section: 1 cm or more (more preferably, 2 cm or more)
[0059]
The micro embossed sheet 20 is manufactured using the manufacturing apparatus 1 as follows.
First, the temperature of the heating roll 17 is raised and the pressure roll 18 is rotated. Next, the embossing plate 10, the transfer sheet 13, and the mirror sheet 15 are laminated in this order on the feed roller 11 of the work table 12 and the endless belt 19 disposed on the extension line of the work table 12, and the heating roll 17. And between the pressure rolls 18. At this time, the surface with the embossed pattern of the embossing plate 10 is a surface that comes into contact with the transfer sheet 13, and the mirror-finished surface of the mirror surface sheet 15 is the surface opposite to the surface that comes into contact with the transfer sheet 13. It is.
[0060]
Further, the inserted embossing plate 10, transferred sheet 13 and mirror surface sheet 15 are supplied between the rolls 17 and 18 so as to be clamped in a horizontal state, and the embossed pattern of the embossed plate 10 is transferred to the transferred sheet 13. (Transfer process).
[0061]
Thereafter, the embossing plate 10, the transfer sheet 13 and the mirror sheet 15 inserted between the heating roll 17 and the pressure roll 18 are conveyed on the endless belt 19 (conveying step).
Further, it is cooled and solidified in a flat state by six second cooling rolls 33 from the inside of the endless belt 19 and four air blowers 25 from the mirror sheet 15 side (cooling step).
[0062]
After the cooling step, the micro embossed sheet 20 completed by transferring the embossed pattern from the embossing plate 10 to the transfer sheet 13 is peeled off by the peeling roll 21 provided across the endless belt 19 of the cooling roll 23. . The peeled micro embossed sheet 20 is taken up by a take-up roll 22 (peeling process).
On the contact surface of the embossed plate 10 of the completed micro-embossed sheet 20, a cube corner type emboss pattern is formed.
The embossing plate 10 from which the microembossed sheet 20 has been peeled can be continuously manufactured by being sent again to the supply side.
[0063]
According to this embodiment as described above, the following effects are obtained.
(1) Since the embossing plate 10 is transported using the endless belt 19, the embossing plate can be continuously and stably moved, so that the embossing pattern can be continuously transferred stably.
(2) By forming the embossed pattern on the embossed plate 10 on the flat rectangular plate, it is relatively easy to form the embossed pattern on the plate compared to the endless belt-shaped embossed plate of the same width and the same area. Since it can manufacture with a small apparatus, manufacturing cost can be suppressed significantly.
(3) Disperse the risk of damage to the embossed plate 10 by making the endless belt on which the embossed pattern of the same width and the same area is formed into a plurality of rectangular plate-shaped embossed plates 10 as in this embodiment. As a result, the manufacturing cost can be reduced.
[0064]
(4) Since the heating roll 17 and the pressure roll 18 are used during the transfer of the emboss pattern, the air between the embossed surface of the emboss plate 10 and the transfer sheet 13 is handled, so a precise emboss pattern is used. It can be transferred reliably.
(5) Since the embossing plate 10 and the transfer sheet 13 are pressed in a flat state, the embossed pattern can be accurately transferred.
(6) Since the emboss pattern is transferred in a flat state and accurately transferred, the transferred emboss pattern is cooled and solidified by the cooling rolls 23 and 33 and the air blower 25 to fix the emboss pattern. A precise embossed pattern can be formed.
[0065]
[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the following description, the same parts and members as those already described are denoted by the same reference numerals and description thereof is simplified.
FIG. 2 shows a manufacturing apparatus 2 according to the second embodiment of the present invention.
[0066]
The manufacturing apparatus 2 used in this manufacturing method includes a work table 12, a heating roll 17, a cooling roll 23, an endless belt 19 wound between these two rolls 17, 23, a supply roll 14, The mirror member 26, the pressure roll 18, the embossing plate 10, the second cooling roll 33, the cooling roll 24, the peeling roll 21, and the winding roll 22 are configured.
[0067]
Here, the 2nd cooling roll 33 has the structure which can cool the embossing plate 10 from the inner side of the endless belt 19, and can cool with the 15 degreeC circulating water circulated through the inside.
The mirror member 26 is a mirror finish of the aluminum surface.
[0068]
The micro embossed sheet 30 is manufactured using the manufacturing apparatus 2 as follows.
First, the temperature of the heating roll 17 is raised and the pressure roll 18 is rotated. Next, the embossing plate 10, the transfer sheet 13, and the mirror member 26 are laminated in this order on the feed roller 11 of the work table 12 and the endless belt 19 arranged on the extension line of the work table 12, and the heating roll 17. And between the pressure rolls 18. At this time, the surface with the embossed pattern of the embossing plate 10 is a surface that comes into contact with the transfer sheet 13, and the mirror-finished surface of the mirror member 26 is a surface that comes into contact with the transfer sheet 13.
[0069]
Further, the inserted embossing plate 10, transferred sheet 13 and mirror surface member 26 are supplied between the rolls 17 and 18 so as to be clamped in a horizontal state, and the embossed pattern of the embossed plate 10 is transferred to the transferred sheet 13. (Transfer process).
[0070]
Thereafter, the embossing plate 10, the transfer sheet 13, and the mirror member 26 inserted between the heating roll 17 and the pressure roll 18 are conveyed on the endless belt 19 (conveying step). Further, the second cooling roll 33 from the inside of the endless belt 19 and the cooling roll 24 also from the mirror member 26 side are cooled and solidified in a flat state (cooling step).
[0071]
After the cooling step, the emboss pattern is transferred from the embossed plate 10 to the transfer sheet 13 by the peeling roll 21 provided at the end of the work table 12, and the completed micro embossed sheet 30 is peeled off. Further, the mirror member 26 is also peeled off from the microembossed sheet 30. The peeled micro embossed sheet 30 is taken up by the take-up roll 22 (peeling process).
[0072]
According to the present embodiment as described above, the following effects are obtained in addition to the effects of the first embodiment.
(7) Since the mirror surface member 26 is brought into contact with the transferred sheet 13 and is subjected to the clamping process, mirror gloss or the like can be imparted to the opposite side of the embossed surface of the transferred sheet 13.
[0073]
[Third Embodiment]
Next, a third embodiment of the present invention will be described. FIG. 3 shows a manufacturing apparatus 3 according to the third embodiment of the present invention.
[0074]
The manufacturing apparatus 3 used in this manufacturing method includes heating rolls 17 and 17, a cooling roll 23, an endless belt 19, cooling rolls 23 and 23, and an endless belt wound between these two cooling rolls 23. 29, a supply roll 14, a supply roll 16, a pressure roll 18, an embossing plate 10, two cooling rolls 24, a peeling roll 21, a take-up roll 27, and a take-up roll 22. It is prepared for.
[0075]
Here, the endless belt 19 is wound between the three rolls 17, 17 and 23 described above, and the first heating roll 17 and the cooling roll 23 are both ends, and the second heating roll 17 is an endless. Located in the approximate center of the belt 19. The pressure roll 18 is disposed above the second heating roll 17 with the endless belt 19 interposed therebetween.
The endless belt 29 is wound between the two cooling rolls 23 described above. Further, one cooling roll 24 is disposed above the cooling roll 23 with the endless belt 19 interposed therebetween. The other cooling roll 24 is disposed above the cooling roll 23 with the endless belt 29 interposed therebetween. Further, the peeling roll 21 is disposed above the other cooling roll 23 with the endless belt 29 interposed therebetween.
[0076]
The micro embossed sheet 30 is manufactured using the manufacturing apparatus 3 as follows.
First, the temperature of the heating rolls 17 is increased, and the pressure roll 18 is rotated. At this time, the embossing plate 10 is heated by the first heating roll 17 before the transfer step (plate heating step).
Next, the embossed plate 10, the transfer sheet 13, and the mirror sheet 15 are stacked in this order on the endless belt 19 and inserted between the second heating roll 17 and the pressure roll 18. At this time, the surface with the embossed pattern of the embossing plate 10 is a surface that comes into contact with the transfer sheet 13, and the mirror-finished surface of the mirror surface sheet 15 is the surface opposite to the surface that comes into contact with the transfer sheet 13. It is.
Further, the inserted embossing plate 10, transferred sheet 13 and mirror surface sheet 15 are supplied between the rolls 17 and 18 so as to be clamped in a horizontal state, and the embossed pattern of the embossed plate 10 is transferred to the transferred sheet 13. (Transfer process).
[0077]
Thereafter, the embossing plate 10, the transfer sheet 13 and the mirror sheet 15 inserted between the heating roll 17 and the pressure roll 18 are conveyed on the endless belt 19 (conveying step).
Further, the cooling rolls 23 and 23 from the inner side of the endless belts 19 and 29 and the cooling rolls 24 and 24 from the mirror sheet 15 side are cooled and solidified in a flat state (cooling step).
[0078]
After the cooling step, the micro embossed sheet 30 completed by transferring the embossed pattern from the embossed plate 10 to the transferred sheet 13 is peeled off by the peeling roll 21 provided on the opposite side of the endless belt 29 of the cooling roll 23. . The peeled micro embossed sheet 30 is taken up by the take-up roll 22 (peeling process). Further, the mirror sheet 15 is collected by a take-up roll 27.
[0079]
According to the present embodiment as described above, the following effects are obtained in addition to the effects of the first embodiment.
(8) Since the embossing plate 10 also has heat in advance by having the plate heating step, the transfer sheet 13 is heated from both the embossing plate 10 and the heating roll 17, and the transfer sheet 13 is transferred before transfer. Since it can be made flexible, the emboss pattern can be efficiently transferred to the transfer sheet 13.
[0080]
It should be noted that the present invention is not limited to the above-described embodiments, and modifications and improvements as long as the object of the present invention can be achieved are included in the present invention.
For example, an elastic member may be interposed between the transfer sheet 13 and the pressure roll 18 in the transfer process.
Moreover, you may employ | adopt what the surface of either endless belt 19 and 29 is coated with heat-resistant peeling resin, such as a polyimide.
Furthermore, in the third embodiment, the heating roll 17 is used as the plate heating step, but the present invention is not limited to this, and a method of heating with an electric heater or the like may be employed.
And you may employ | adopt the sheet | seat heating process which heats the to-be-transferred sheet | seat 13 before a transfer process with an electric heater.
[0081]
Furthermore, as a modification of the manufacturing apparatus according to the present invention, various combinations of methods can be employed as shown in FIGS. In the following description, descriptions of the embossing plate 10, the transfer sheet 13, the mirror sheet 15, the supply rolls 14 and 16, the micro embossing sheet 20, the peeling roll 21, the winding roll 22, and the like are omitted.
As shown in FIG. 4, the heating roll 17, the cooling roll 23, the endless belt 19 wound between these rolls 17, 23, and the heating roll 17 disposed above the heating roll 17. A manufacturing apparatus 4 having a pressure roll 18 as a basic configuration.
[0082]
As shown in FIG. 5, the heating rolls 17, 17, the cooling roll 23, the second cooling roll 33, and the rolls 17, 17, 23, 33 are wound so that they are located on the apex and one side of the triangle. An endless belt 19, a pressure roll 18 disposed above one heating roll 17 across the endless belt 19, and a cooling roll 24 disposed at a position facing the second cooling roll 33 in the endless belt 19. Manufacturing apparatus 5 having a basic configuration.
[0083]
As shown in FIG. 6, the heating rolls 17, 17, 17, the cooling roll 23, the second cooling roll 33, and among these rolls 17, 17, 17, 23, 33, the heating rolls 17, 17, the cooling roll 23 is located at the apex of the triangle, and the remaining heating roll 17 and second cooling roll 33 are wound on the side of the triangle, and the endless belt 19 is wound on the side of the triangle. The pressure roll 18 disposed on the upper side of the heating roll 17 positioned at the upper side, and the cooling roll 24 disposed at a position opposite to the second cooling roll 33 positioned on one side of the triangle in the endless belt 19, Manufacturing apparatus 6 to perform.
[0084]
As shown in FIG. 7, a heating roll 17, a cooling roll 23, an endless belt 19 around which these rolls 17 and 23 are wound, a small heating roll 17 and a second cooling roll disposed in the endless belt 19. 33, a manufacturing apparatus 7 having a basic configuration of a pressing roll 18 disposed above the small heating roll 17 and a second cooling roll 33 disposed below the peeling roll 21 with the endless belt 19 interposed therebetween.
As shown in FIG. 8, a heating roll 17, a cooling roll 23, an endless belt 19 around which these rolls 17 and 23 are wound, a small heating roll 17 disposed in the endless belt 19, and an endless belt 19. The manufacturing apparatus 8 which has the press roll 18 arrange | positioned above the small heating roll 17 on both sides of a basic structure.
[0085]
As shown in FIG. 9, heating rolls 17, 17, endless belt 19 around which these rolls 17, 17 are wound, cooling rolls 23, 23, endless belt 29 around which these rolls 23, 23 are wound, The pressure rolls 18 and 18 disposed above the heating rolls 17 and 17 with the endless belt 19 interposed therebetween, and the pressure rolls 18 and 18 disposed above the cooling rolls 23 and 23 with the endless belt 29 interposed therebetween, respectively. A manufacturing apparatus 9 having a peeling roll 21 as a basic configuration.
[0086]
As shown in FIG. 10, the cooling rolls 23, 23, the endless belt 29 around which these rolls 23, 23 are wound, the heating rolls 17, 17, and the rolls 17, 17 and the endless belt 29 are wound around. An endless belt 19, a pressure roll 18 disposed above the heating roll 17 with the endless belt 19 interposed therebetween, a pressure roll 18 disposed above the cooling roll 23 with the endless belts 29 and 19 interposed therebetween, and an endless belt A manufacturing apparatus 40 having a basic configuration of a peeling roll 21 disposed on the upper side of another cooling roll 23 with belts 29 and 19 interposed therebetween.
[0087]
As shown in FIG. 11, a heating roll 17, a cooling roll 23, an endless belt 19 around which these rolls 17, 23 are wound, a heating roll 17, a peeling roll 21, and these rolls 17, 21 are wound. The endless belt 29 and the endless belts 19 and 29 are arranged in parallel, and the heating roll 17 on the endless belt 29 side is disposed above the heating roll 17 on the endless belt 19 side. A manufacturing apparatus 41 in which the peeling roll 21 on the endless belt 29 side is disposed above the cooling roll 23.
In addition, the specific structure, shape, and the like when carrying out the present invention may be other structures and the like as long as the object of the present invention can be achieved.
[0088]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
In the first embodiment, the micro embossed sheet 20 was manufactured under the following specific conditions.
[0089]
Embossed version 10
Material: Electroformed nickel
Dimensions: 400mm (width) x 200mm (length in transfer direction) x 0.4mm (thickness)
Surface shape: equilateral triangle with base of 173 μm, pattern height of 70.6 μm
[0090]
Heating roll 17
Dimensions: Inner diameter 256mm, surface length 700mm
Surface material: Hard chrome plating
Heating structure: 12 rod-shaped ceramic heaters are inserted in the heating roll 17 and the maximum total output is 6 kW.
[0091]
Pressure roll 18
Dimensions: Inner diameter 140mm, surface length 600mm
Surface: Made of silicon rubber with a hardness of 75 degrees
[0092]
Transfer sheet 13
Material: EMMA (ethylene-methyl methacrylate copolymer)
(Okamoto Co., Ltd., trade name Emmasoft, melting point 89 ° C)
Shape: width 440mm, thickness 0.20mm, continuous sheet
Other: No coloring (transparent)
[0093]
Mirror surface sheet 15
Material: O-PET (stretched polyethylene terephthalate)
(Product name: Lumirror, manufactured by Toray Industries, Inc.)
Shape: width 440mm, thickness 0.038mm, biaxially stretched sheet
[0094]
Endless belt 19
Material: Stainless steel
Shape: Width 600mm, circumference 2300mm, thickness 0.60mm, surface roughness 0.4μm (Ra)
[0095]
Cooling rolls 23 and 33
The cooling section is about 60 cm from the pinching part (between the heating roll 17 and the pressure roll 18).
The cooling structure uses water circulated inside the rolls 23 and 33 at 15 ° C.
[0096]
Air blower 25
Located outside the endless belt 19, the embossed plate 10 and the like are cooled by air cooling (18 ° C.).
[0097]
Furthermore, the operating conditions of the manufacturing apparatus 1 are shown below.
Temperature of heating roll 17: 123 ° C
Linear pressure applied between the heating roll 17 and the pressure roll 18: 600 N / cm
Transfer speed: 3.0 m / min
Cooling conditions: The temperature was 31 ° C. at the end of the cooling section, that is, at the time of peeling.
[0098]
The micro embossed sheet 20 to which the embossed pattern is transferred by the embossed plate 10 has retroreflectivity. As a method for evaluating the retroreflectivity of the obtained micro-embossed sheet 20, it can be evaluated by its retroreflection coefficient. The retroreflection coefficient is measured by the method described in JIS Z8714-1995.
For the retroreflective coefficient (observation angle 0.2 degree, irradiation angle 5 degree) of the micro embossed sheet 20, 21 points were measured in the plane, and the average value was 288 [cd / lux / m.²]Met.
According to JISZ9117-1984, the first-order retroreflection coefficient of colorless (transparent / white) is 70 [cd / lux / m.²The second-class reflection coefficient is 35 [cd / lux / m²].
In this example, the performance is sufficiently satisfied, and therefore it can be said that the production method of the present invention exhibits sufficient transferability.
[0099]
【The invention's effect】
According to the present invention, the embossed plate and the sheet to be transferred are inserted between the rolls via the endless belt, and the embossed pattern is transferred by clamping, so that the continuous transfer of the embossed pattern is also possible. Is possible.
Also, compared to the method of transferring the embossed pattern with a roll formed with the same width and area of the embossed pattern, the embossed pattern is transferred using multiple embossed plates, thereby reducing the risk of damage to the embossed plate. As a result, the cost of the apparatus can be reduced.
Furthermore, when transferring the embossed pattern, the embossing plate and the transferred sheet are pressed with a roll, so the air between the embossed surface of the embossed plate and the transferred sheet is handled, so that the precise embossed pattern is transferred reliably. can do.
Since the embossed plate is moved using an endless belt, the embossed plate can be moved continuously and stably, so that the embossed pattern can be continuously transferred stably.
[Brief description of the drawings]
FIG. 1 is a diagram showing a manufacturing apparatus according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a manufacturing apparatus according to a second embodiment of the present invention.
FIG. 3 is a view showing a manufacturing apparatus according to a third embodiment of the present invention.
FIG. 4 is a view showing a first modification of the manufacturing apparatus of the present invention.
FIG. 5 is a view showing a second modification of the manufacturing apparatus of the present invention.
FIG. 6 is a view showing a third modification of the manufacturing apparatus of the present invention.
FIG. 7 is a view showing a fourth modification of the manufacturing apparatus of the present invention.
FIG. 8 is a view showing a fifth modification of the manufacturing apparatus of the present invention.
FIG. 9 is a view showing a sixth modification of the manufacturing apparatus of the present invention.
FIG. 10 is a view showing a seventh modification of the manufacturing apparatus of the present invention.
FIG. 11 is a view showing an eighth modification of the production apparatus of the present invention.
[Explanation of symbols]
1-9, 40, 41 Manufacturing equipment
10 Embossed version
11 Feed roller
12 Working table
13 Transfer sheet
14, 16 Supply roll
15 Mirror surface sheet
17 Heating roll
18 Pressure roll
19, 29 Endless belt
20 Micro embossed sheet
21 Peeling roll
22, 27 Winding roll
23, 24 Cooling roll
25 Air blower
26 Mirror surface member
28 rolls
30 Micro embossed sheet
33 Second cooling roll

Claims (26)

A method for producing a micro-embossed sheet having a fine embossed pattern, wherein a transfer sheet is superposed on the surface of an embossed plate on which the embossed pattern is formed, and a pair of rolls are arranged on the front and back sides of the embossed plate. by the pair of rolls, a transfer step which nipped the embossing and the receiver sheet to transfer the emboss pattern to the receiver sheet,
After the transfer step, a cooling step for cooling and solidifying the embossed plate and the transfer sheet in close contact with each other;
A transfer step of transferring the embossed plate after transfer and the transferred sheet by an endless belt wound around at least one of the pair of rolls;
A method for producing a micro-embossed sheet, comprising a peeling step for peeling off the transferred sheet from the embossed plate after the cooling step and the conveying step. In the manufacturing method of the micro-embossed sheet of Claim 1,
The method for producing a micro-embossed sheet, wherein the cooling step is performed by a cooling means provided in a conveying process by the endless belt. In the manufacturing method of the micro embossing sheet of Claim 2,
The method for producing a micro-embossed sheet, wherein the cooling means includes a cooling roll that is disposed apart from one of the pair of rolls and on which the endless belt is wound. In the manufacturing method of the micro embossing sheet of Claim 3,
The method for producing a micro-embossed sheet, wherein the cooling means includes a second cooling roll disposed between the one roll and the cooling roll. In the manufacturing method of the micro embossing sheet of Claim 2 or Claim 3,
The method for producing a micro-embossed sheet, wherein the cooling means includes a cooling air blowing mechanism for blowing cooling air from the transfer sheet side. In the manufacturing method of the micro embossing sheet in any one of Claims 1-5,
The said cooling process cools a to-be-transferred sheet below the softening point, The manufacturing method of the micro embossing sheet characterized by the above-mentioned. In the manufacturing method of the micro embossing sheet in any one of Claims 1-6,
A method for producing a micro-embossed sheet, wherein the material of the endless belt is metal. In the manufacturing method of the micro embossing sheet in any one of Claims 1-7,
A micro-embossed sheet characterized in that the transfer sheet is supplied between a pair of rolls so as to contact the endless belt, and the endless belt is coated with a heat-resistant release resin. Production method. In the manufacturing method of the micro embossing sheet in any one of Claims 1-8,
Of the pair of rolls used in the transfer step, at least one of the rolls is a heating roll. In the manufacturing method of the micro embossing sheet according to claim 9,
The method for producing a micro-embossed sheet, wherein the embossed plate is arranged on the heating roll side. In the manufacturing method of the micro-embossed sheet according to claim 9 or 10,
Of the pair of rolls, the surface of at least one of the rolls is made of an elastic body. In the manufacturing method of the micro emboss sheet in any one of Claims 9-11,
The method for producing a micro-embossed sheet is characterized in that, in the transferring step, when the embossed plate and the sheet to be transferred are sandwiched, the sheet to be transferred is heated to the softening point or higher. In the manufacturing method of the micro embossing sheet according to any one of claims 9 to 12,
A method for producing a micro-embossed sheet, wherein a linear pressure at the time of clamping the embossed plate and the transferred sheet in the transfer step is 50 N / cm or more. In the manufacturing method of the micro-embossed sheet according to any one of claims 9 to 13,
The method for producing a micro-embossed sheet characterized in that in the transferring step, a mirror member whose surface abutting against the transfer sheet is mirror-finished is overlapped and pressed. In the manufacturing method of the micro embossing sheet in any one of Claims 9-14,
The method for producing a micro-embossed sheet, wherein the transferring step includes superposing a mirror surface sheet having a mirror surface on a transfer sheet. In the manufacturing method of the micro embossing sheet in any one of Claims 9-15,
The method for producing a micro-embossed sheet, wherein the transferring step includes pressing an elastic member between the transfer sheet and the roll. In the manufacturing method of the micro embossing sheet in any one of Claims 9-16,
The method for producing a micro-embossed sheet, wherein the endless belt is wound around the heating roll. In the manufacturing method of the micro embossing sheet in any one of Claims 1-17,
A method for producing a micro-embossed sheet comprising a plate heating step of heating an embossed plate in advance before the transfer step. In the manufacturing method of the micro embossing sheet in any one of Claims 1-18,
A method for producing a micro-embossed sheet comprising a sheet heating step of heating a transfer sheet in advance before the transfer step. In the manufacturing method of the micro embossing sheet according to any one of claims 1 to 19,
The method for producing a micro-embossed sheet, wherein the transfer sheet is made of a thermoplastic resin. In the manufacturing method of the micro emboss sheet in any one of Claims 1-20,
The method for producing a micro-embossed sheet, wherein the transfer sheet is continuous long. In the manufacturing method of the micro embossing sheet according to any one of claims 1 to 21,
The method for producing a micro-embossed sheet, wherein the embossed plate is made of metal. In the manufacturing method of the micro embossing sheet according to any one of claims 1 to 22,
The method of manufacturing a micro-embossed sheet, wherein the embossed plate is disposed at a position where the embossed plate comes into contact with the endless belt. In the manufacturing method of the micro embossing sheet in any one of Claims 1-23,
The method for producing a micro-embossed sheet, wherein the embossed plate is disposed at a position where it does not contact the endless belt. In the manufacturing method of the micro embossing sheet in any one of Claims 1-24,
The method for producing a micro embossed sheet, wherein the embossed plate includes a concave cube corner type embossed pattern. In the manufacturing method of the micro embossing sheet in any one of Claims 1-25,
In the transfer step, the embossed plate is continuously supplied between the pair of rolls.

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