JP5919983B2 - Method for manufacturing uneven pattern forming sheet and manufacturing apparatus for uneven pattern forming sheet - Google Patents

Description

  The present invention relates to a manufacturing method and a manufacturing apparatus for manufacturing an uneven pattern forming sheet having an uneven pattern on at least one surface.

As an optical element such as an antireflective body or a light diffuser, it is known to use a concavo-convex pattern forming sheet having a fine wavy concavo-convex pattern formed on the surface.
As a method for producing the above-mentioned uneven pattern forming sheet, Patent Document 1 discloses that a heat-shrinkable film having a hard layer on at least one surface of a long heat-shrinkable film that shrinks in the width direction is heated while being continuously moved. Thus, a method for producing a concavo-convex pattern forming sheet by shrinking the width direction of the heat-shrinkable film is disclosed.
When a heat-shrinkable film that shrinks in the width direction is used, the length in the repeating direction of the concavo-convex pattern of the obtained concavo-convex pattern forming sheet depends on the width of the heat-shrinkable film. Therefore, in order to obtain a large concavo-convex pattern forming sheet, a heat-shrinkable film having a long width direction must be used. However, since a heat-shrinkable film that shrinks in the width direction is usually produced by stretching an unstretched film in the width direction, in order to lengthen the width direction, the width direction of the stretching apparatus must also be lengthened. It lacked industrial feasibility.
Therefore, in Patent Document 2, the heat shrinkable film is shrunk in the longitudinal direction by continuously heating and moving the laminated film having a hard layer on at least one side of the heat shrinkable film shrinking in the longitudinal direction. Thus, a method for producing a concavo-convex pattern forming sheet has been proposed. Furthermore, in Patent Document 2, in order to adjust the shrinkage rate in the longitudinal direction, both ends in the width direction of the heat-shrinkable film are gripped by a plurality of clips so that the distance in the longitudinal direction of the clips becomes narrower as the heat shrinks. A method for controlling the position of a clip is disclosed.

JP 2008-304651 A JP 2010-266479 A

However, in the manufacturing method described in Patent Document 2, it is difficult to adjust the position of the clip in accordance with the rate of heat shrinkage, and the obtained concavo-convex pattern forming sheet can be visually recognized with irregularities different from the concavo-convex pattern. In some cases, wrinkles occurred and the product could not be used.
Therefore, the present invention can easily produce a concavo-convex pattern-forming sheet in which the generation of wrinkles that are visible irregularly and separately from the concavo-convex pattern is suppressed, despite the use of a heat-shrinkable film that contracts in the longitudinal direction It aims at providing the manufacturing method and manufacturing apparatus of an uneven | corrugated pattern formation sheet.

The present invention has the following aspects.
[1] A method for producing a concavo-convex pattern forming sheet in which a heat-shrinkable film is shrunk by heating a laminated film provided with a hard layer on at least one side of a long heat-shrinkable film that shrinks in the longitudinal direction by heating. Then, only the width direction of the laminated film is heated in a state where it is constrained so as to maintain a certain length, so that the longitudinal direction of the heat-shrinkable film is shortened so that the hard layer is folded. After the deformation step and after the deformation step, while the shrinkage force of the heat shrink film remains , both the width direction and the longitudinal direction of the laminated film are constrained so as to maintain a certain length, and the lamination The manufacturing method of the uneven | corrugated pattern formation sheet characterized by including the tension | tensile_strength provision process which provides tension | tensile_strength to a film.
[2] The method for producing a concavo-convex pattern forming sheet according to [1], in which far-infrared rays are irradiated in the heating of the laminated film.
[3] Concave and convex pattern formation according to [1] or [2], including an annealing step in which the laminated film is annealed by heating at a temperature lower than the heating temperature in the deformation step before the deformation step. Sheet manufacturing method.
[4] The unevenness according to [3], wherein a tension in a longitudinal direction of the annealed laminated film is adjusted and the tension is divided so as not to be transmitted to the laminated film deformed in the deformation step. A method for producing a pattern forming sheet.

[5] By heating a laminated film in which a hard layer is provided on at least one side of a long heat-shrinkable film that shrinks in the longitudinal direction by heating, the heat-shrinkable film is shrunk and the hard layer is folded. An apparatus for manufacturing a concavo-convex pattern forming sheet that deforms to form a concavo-convex pattern, comprising a plurality of pairs of gripping means for gripping both end sides in the width direction of the laminated film so as to maintain a constant width. The plurality of pairs of gripping means are separated from the other gripping means in the longitudinal direction when heating of the laminated film is started, and then the other heat-shrinkable film contracts, thereby causing another gripping in the longitudinal direction. An apparatus for producing a concavo-convex pattern forming sheet, wherein the laminated film is held so as to come into contact with the means.
[6] by heating while moving continuously longitudinally laminated film provided with at least a hard layer on one side of the heat shrinkable film elongated contracts in the longitudinal direction by heating, shrinking the heat shrinkable film A concavo-convex pattern forming sheet for forming a concavo-convex pattern by deforming the hard layer so as to be folded, and a plurality of pairs of gripping means for gripping both end sides in the width direction of the laminated film, A pair of linear rails provided so as to extend along the respective widthwise ends of the laminated film and supporting the plurality of pairs of gripping means so as to be able to travel; and before traveling the laminated film between the pair of rails. or a pair of supply means for supplying a gripping means to grip the gripping means derived together with the laminated film from the laminated film running direction downstream end of each rail rail A pair of transporting means for transporting them apart from each other; and a heating means for heating a portion between the pair of rails of the laminated film gripped by the gripping means. When starting to travel, the laminate film is separated from the preceding gripping means, and the laminate film is gripped so that the heat-shrinkable film contracts while traveling on the rail so that the film contracts with the preceding gripping means. Each conveying means conveys the gripping means derived from the downstream end of each rail in the laminated film running direction with the preceding gripping means and the following gripping means in contact with each other. An apparatus for producing a concavo-convex pattern forming sheet, wherein the laminated film is moved by conveying a plurality of pairs of gripping means by the conveying means.
[7] The uneven pattern forming sheet manufacturing apparatus according to [6], wherein the heating means is a far infrared lamp.
[8] The apparatus for producing a concavo-convex pattern forming sheet according to any one of [5] to [7], comprising annealing means for heating and annealing the laminated film before being held by the holding means.
[9] Tension adjusting means for adjusting the longitudinal tension of the laminated film heated by the annealing means, and the tension adjusted by the tension adjusting means not to be transmitted to the laminated film held by the holding means The apparatus for producing a concavo-convex pattern forming sheet according to [8], comprising tension dividing means for dividing.

  According to the manufacturing method and manufacturing apparatus of the concavo-convex pattern forming sheet of the present invention, the generation of irregular and visible wrinkles other than the concavo-convex pattern is suppressed despite the use of a heat-shrinkable film that contracts in the longitudinal direction. The uneven | corrugated pattern formation sheet made can be manufactured easily.

It is an expansion perspective view which expands and shows a part of one embodiment of a concavo-convex pattern formation sheet of the present invention. It is sectional drawing when the uneven | corrugated pattern formation sheet of FIG. 1 is cut | disconnected in the orthogonal direction with the formation direction of an uneven | corrugated pattern. It is an upper surface schematic diagram which shows 1st Embodiment of the manufacturing apparatus of the uneven | corrugated pattern formation sheet of this invention. It is a side surface schematic diagram which shows 1st Embodiment of the manufacturing apparatus of the uneven | corrugated pattern formation sheet of this invention. It is a perspective view which shows the rail which comprises the manufacturing apparatus of the uneven | corrugated pattern formation sheet of FIG. It is a side view which shows the holding means which comprises the manufacturing apparatus of the uneven | corrugated pattern formation sheet of FIG. It is an upper surface schematic diagram which shows 2nd Embodiment of the manufacturing apparatus of the uneven | corrugated pattern formation sheet of this invention. It is a side surface schematic diagram which shows 2nd Embodiment of the manufacturing apparatus of the uneven | corrugated pattern formation sheet of this invention.

<Uneven pattern forming sheet>
One embodiment of the concavo-convex pattern forming sheet in the present invention will be described.
The perspective view of the uneven | corrugated pattern formation sheet obtained by FIG. 1 and FIG. 2 by this embodiment is shown. This uneven | corrugated pattern formation sheet 10 is equipped with the base material 11 and the hard layer 12 provided in the single side | surface of the base material 11, and the hard layer 12 has the uneven | corrugated pattern 12a.
Here, the concavo-convex pattern 12a is a wave pattern in which the convex portions 12b are repeatedly formed so that the concave and convex portions (the convex portions 12b and the concave portions 12c) are repeated along the one direction X. In this specification, the convex part 12b is a convex part which exists between the bottom of the recessed part 12c and the bottom of the adjacent recessed part 12c among unevenness | corrugations (refer FIG. 2).
Moreover, as for the uneven | corrugated pattern 12a, the front-end | tip of the convex part 12b is rounded, and also the ridgeline of the uneven | corrugated pattern 12a meanders.

  The concavo-convex pattern forming sheet is used as an optical element such as an antireflection body or a light diffuser. Moreover, it can also be used as a process sheet original plate for duplicating and manufacturing an optical element. As a method for producing an optical element using the concave / convex pattern forming sheet as a replica process sheet original, for example, a method disclosed in Japanese Patent Application Laid-Open No. 2008-304701 can be applied.

The hard layer 12 is harder than the heat-shrinkable film when a heat-shrink film, which will be described later, which becomes the base material 11 is heat-shrinked. The hard layer 12 may be made of a resin, or may be made of a metal or a metal compound.
When the hard layer 12 is made of resin, the glass transition temperature Tg ₂ of the resin constituting the hard layer 12 (hereinafter referred to as second resin) and the resin constituting the substrate 11 (hereinafter referred to as first resin). )) And the glass transition temperature Tg ₁ (Tg ₂ −Tg ₁ ) are larger than 0 ° C., preferably 10 ° C. or higher, more preferably 20 ° C. or higher, and 30 ° C. or higher. Particularly preferred. If _(Tg 2 -Tg ₁₎ the difference is 10 ° C. or higher, when manufacturing the uneven pattern forming sheet can easily be processed at temperatures between Tg ₂ and Tg _1. If the temperature between Tg ₂ and Tg ₁ is the processing temperature, the substrate 11 can be processed under the condition that the Young's modulus of the substrate 11 is higher than the Young's modulus of the hard layer 12, and as a result, the uneven pattern 12 a can be more easily formed on the hard layer 12. Can be formed.
In addition, it is not necessary to use a resin having a Tg ₂ exceeding 400 ° C. from the viewpoint of economic efficiency, and there is no resin having a Tg ₁ lower than −150 ° C., so (Tg ₂ -Tg ₁ ) is 550. It is preferably not higher than ° C., more preferably not higher than 200 ° C.
The difference in Young's modulus between the base material 11 and the hard layer 12 at the processing temperature when producing the concavo-convex pattern forming sheet 10 is preferably 0.01 to 300 GPa because the concavo-convex pattern 12a can be easily formed. More preferably, it is 1-10 GPa.
The processing temperature here is, for example, a heating temperature at the time of thermal contraction in the method for manufacturing the uneven pattern forming sheet 10 described later. The Young's modulus is a value measured according to JIS K 7113-1995.

The glass transition temperature Tg ₁ of the first resin is preferably −150 to 300 ° C., more preferably −120 to 200 ° C. If there is no resin having a glass transition temperature Tg ₁ lower than −150 ° C. and the glass transition temperature Tg ₁ of the first resin is 300 ° C. or less, the processing temperature (Tg ₂₎ when manufacturing the concavo-convex pattern forming sheet 10. And a temperature between ₁ and Tg ₁ ).

  The Young's modulus of the first resin at the processing temperature when manufacturing the uneven pattern forming sheet 10 is preferably 0.01 to 100 MPa, and more preferably 0.1 to 10 MPa. If the Young's modulus of the first resin is 0.01 MPa or more, it is a hardness that can be used as the base material 11, and if it is 100 MPa or less, it is soft enough to follow and deform simultaneously when the hard layer 12 is deformed. That's it.

  The first resin is a resin constituting a heat-shrinkable film described later, and examples thereof include polyesters such as polyethylene terephthalate, polyolefins such as polyethylene and polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, and polyamide.

Preferably has a glass transition temperature Tg ₂ of the second resin is 40 to 400 ° C., and more preferably 80 to 250 ° C.. If the glass transition temperature Tg ₂ of the second resin is 40 ° C. or higher, it is useful that the processing temperature for producing the concavo-convex pattern forming sheet 10 can be room temperature or higher, and the glass transition temperature Tg _2. This is because the use of a resin having a temperature exceeding 400 ° C. as the second resin is not necessary from the viewpoint of economy.

  The Young's modulus of the second resin at the processing temperature when manufacturing the uneven pattern forming sheet 10 is preferably 0.01 to 300 GPa, and more preferably 0.1 to 10 GPa. If the Young's modulus of the second resin is 0.01 GPa or more, sufficient hardness can be obtained from the Young's modulus at the processing temperature of the first resin, and the concavo-convex pattern 12a is maintained after the concavo-convex pattern 12a is formed. It is because it is scarcely necessary from the economical viewpoint to use as the second resin a resin that has sufficient hardness and a Young's modulus exceeding 300 GPa.

  Depending on the type of the first resin, examples of the second resin include polystyrene, acrylic resin (methyl methacrylate polymer, copolymer of methyl methacrylate and other acrylic monomers, and other than methyl methacrylate). Copolymer of two or more acrylic monomers), styrene-acrylic copolymer, styrene-acrylonitrile copolymer, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, ethylene-vinyl acetate copolymer, etc. can do. Among these, polystyrene and acrylic resin are preferable in that the uneven pattern can be more easily formed. A 2nd resin may be used individually by 1 type, and may use 2 or more types together.

When the hard layer is composed of a metal or a metal compound, the Young's modulus does not become excessively high as the metal, and the uneven pattern 12a is more easily formed. Therefore, gold, aluminum, silver, carbon, copper, germanium, indium It is preferably at least one metal selected from the group consisting of magnesium, niobium, palladium, lead, platinum, silicon, tin, titanium, vanadium, zinc, and bismuth. The metal here includes a semi-metal.
For the same reason, the metal compounds include titanium oxide, aluminum oxide, zinc oxide, magnesium oxide, tin oxide, copper oxide, indium oxide, cadmium oxide, lead oxide, silicon oxide, barium fluoride, calcium fluoride, fluoride. It is preferably at least one metal compound selected from the group consisting of magnesium, zinc sulfide and gallium arsenide.
When the hard layer 12 is made of metal, the surface of the layer may be air oxidized to form an air oxide film. However, in the present invention, the surface of such a metal layer may be air oxidized. It is considered as a layer made of metal.

When the hard layer 12 is made of a resin, the thickness of the hard layer 12 is preferably 0.1 to 80 nm, more preferably 0.5 to 40 nm, and particularly preferably 1 to 15 nm.
When the hard layer 12 is composed of a metal or a metal compound, the thickness of the hard layer 12 is preferably 1 to 30 nm, and more preferably 1 to 10 nm.
If the thickness of the hard layer 12 exceeds the upper limit value, the pitch of the uneven pattern 12a may not be reduced, and if it is less than the lower limit value, the formation of the hard layer 12 tends to be difficult.
The thickness of the hard layer 12 is preferably uniform. If the thickness of the hard layer 12 is uniform, the uniformity of the pitch is increased.
Further, a primer layer may be formed between the base material 11 and the hard layer 12 for the purpose of improving adhesion and forming a finer structure.

A preferable range of the most frequent pitch A of the concavo-convex pattern 12 a varies depending on the application of the concavo-convex pattern forming sheet 10.
When the uneven pattern forming sheet 10 is used for an antireflection body, the most frequent pitch A is preferably 1 μm or less, more preferably 250 nm or less, further preferably 150 nm or less, and 100 nm or less. It is particularly preferred. If the most frequent pitch A is 1 micrometer or less, the antireflection property at the time of using the uneven | corrugated pattern formation sheet 10 as an antireflection body becomes higher. On the other hand, the most frequent pitch A is preferably 0.01 μm or more from the viewpoint that the uneven pattern 12a can be easily formed.
When using the uneven | corrugated pattern formation sheet 10 for a light diffuser, it is preferable that the most frequent pitch A exceeds 1 micrometer and is 20 micrometers or less, and it is more preferable that it exceeds 1 micrometer and is 10 micrometers or less. When the most frequent pitch A is less than the lower limit and exceeds the upper limit, it is difficult to obtain a light diffuser with high light diffusibility.

The most frequent pitch A and the degree of orientation of the concavo-convex pattern 12a are obtained according to the following method.
First, the top surface of the concavo-convex pattern is photographed with a surface optical microscope, and the image of the measured concavo-convex structure is converted into a grayscale image, and then two-dimensional Fourier transform is performed. The frequency (Z _F ) of the Fourier transform image is smoothed to obtain a position (X _Fmax , Y _Fmax ) indicating the maximum frequency other than the center of the Fourier transform image. Then, the most frequent pitch A is _obtained from the expression of the most frequent pitch A = 1 / {√ {square root over (X _Fmax ² + Y _Fmax ² )}}. The most frequent pitch may be regarded as an average value of each pitch.
The degree of orientation, first, by using the Fourier change image obtained above, creates a Fourier transform image rotated θ so that the maximum luminance portion matches on the X _F axis. Next, a parallel auxiliary line Y ′ _F is drawn on the Y _F axis passing through (X _Fmax , Y _Fmax ), the auxiliary line Y ′ _F is taken as the horizontal axis, and the luminance (Z _F axis) on the auxiliary line Y ′ _F is taken as the vertical axis. Y ' _F -Z _F diagram is created. Next, a Y ″ _F -Z _F diagram is created by dividing the value of the Y ′ _F axis of the Y ′ _F -Z _F diagram by the reciprocal (1 / A) of the most frequent pitch, and from this Y ″ _F -Z _F diagram The half width W of the peak (the width of the peak at a height at which the frequency is half the maximum value) is obtained. This half width represents the degree of orientation. The larger the degree of orientation, the more meandering the pitch.

The degree of orientation is preferably 1.0 or less, more preferably 0.5 or less, and particularly preferably less than 0.3. If the degree of orientation is 1.0 or less, the anisotropy can be increased when used as a light diffuser.
In order to make the degree of orientation 1.0 or less, a method of applying a compressive stress necessary for manufacturing the uneven pattern forming sheet 10 may be appropriately selected.
The degree of orientation is preferably 0.05 or more from the viewpoint of production.

The average depth B of the recesses 12c of the concavo-convex pattern 12a is preferably 10% or more (that is, the aspect ratio is 0.1 or more) when the most frequent pitch A is 100%, and is 30% or more (that is, the aspect). The ratio is more preferably 0.3 or more, and particularly preferably 100% or more. If the average depth B is 10% or more when the most frequent pitch A is 100%, the uneven pattern forming sheet 10 is more excellent in reflectivity when used as an antireflection body.
Further, the average depth B is preferably 500% or less when the most frequent pitch A is 100% from the viewpoint that the uneven pattern 12a can be easily formed.

The average depth means the average of the depth from the peak of the convex part 12b of the concavo-convex pattern 12a to the bottom of the concave part 12c. The average depth B is obtained as follows. That is, the concavo-convex pattern 12a is observed with an atomic force microscope, and a cross-sectional view cut along the Y-axis direction is obtained from the observation. The depth to the bottom of one recess 12c is ½ of the sum of the distances in the Z direction from the peaks of the two adjacent protrusions 12b and 12c to the bottom of the recess 12c. That is, one depth _{b i} of the bottom of the recess 12c is the depth of the bottom of the recess 12c as measured from the peak of one side of the projecting portion 12b with respect to the recess 12c of the _{L i,} the other side of the convex portion 12b peak B _i = (L _i + R _i ) / 2 where R _i is the bottom depth of the recess 12c measured from the above. The average value of the depth b _i of each recess 12c thus determined is the average depth B, because it is not practical to determine the depth of all the concave portions 12c, 10 or more randomly extracted The average depth B is obtained from 100 or less bi.

<Manufacturing apparatus for uneven pattern forming sheet>
“First Embodiment”
1st Embodiment of the manufacturing apparatus (henceforth "a manufacturing apparatus") of the uneven | corrugated pattern formation sheet of this invention is described.
3 and 4 show the manufacturing apparatus of this embodiment. The manufacturing apparatus 1 of the present embodiment includes an unwinding roll 20, a pair of rails 30, a pair of supply means 40, a pair of conveying means 50, a plurality of pairs of gripping means 60, and a heating means 70. .

(Unwinding roll)
The unwinding roll 20 is a roll around which the laminated film 10a is wound, and is a free roll that does not include a drive source.
The unwinding of the laminated film 10a from the unwinding roll 20 is caused by the tensile force generated in the laminated film 10a when the gripping means 60 is conveyed by the conveying means 50 and the shrinkage of the laminated film 10a that occurs when heated by the heating means 70. Power is the driving force.

(rail)
The rail 30 is linearly provided with a predetermined length along each end in the width direction of the laminated film 10a, and supports a plurality of pairs of gripping means 60 so as to run.
Each of the rails 30 in the present embodiment has a substantially rectangular cross section perpendicular to the longitudinal direction, and as shown in FIG. 5, the first side surface portion 31, the second side surface portion 32, the upper surface portion 33, and the lower surface portion 34. And have. A slit 35 is formed in the second side surface portion 32 along the longitudinal direction of the rail 30. The second side surface portion 32 serves as a guide plate for preventing the derailment of the gripping means 60.

(Supply means)
The supply means 40 in the present embodiment is provided on the upstream side of the rail 30 and on both end sides in the width direction of the moving laminated film 10a, and before the laminated film 10a travels between the pair of rails 30. The gripping means 60 is supplied at regular intervals so that the gripping means 60 is gripped.

Specifically, the supply means 40 in the present embodiment includes an endless belt 41 that supplies the gripping means 60 to the laminated film 10 a, a pair of rolls 42 that support the endless belt 41, and the gripping means 60 on the endless belt 41. And a supply guide 43 to be supplied. The supply means 40 is disposed so that the laminated film 10a is positioned between a pressing portion 61a and a holding surface 62a of the gripping means 60 described later when the gripping means 60 is supplied to the laminated film 10a by the endless belt 41. ing.
Further, the supply means 40 includes a lever pulling means (not shown) for pulling down a later-described lever 61c of the gripping means 60 immediately before holding the laminated film 10a, and a lever 61c for holding the laminated film 10a. Lever raising means (not shown) for raising.

In the present embodiment, the endless belt 41 is formed with rectangular holes 41a into which protruding portions 64 of the gripping means 60 described later are inserted at regular intervals in the vertical direction. Further, the endless belt 41 is installed so that the upstream side of the laminated film 10 a is inclined so as to be higher than the downstream side, and the gripping means 60 can be introduced into the rail 30. Further, the endless belt 41 is configured to rotate when the gripping means 60 in which the protruding portion 64 is inserted into the hole 41a sandwiches the moving laminated film 10a.
The supply guide 43 is a groove-like body having a rectangular bottom surface portion 43a and a side surface portion 43b erected from an end in the width direction of the bottom surface portion 43a, and is formed by the bottom surface portion 43a and the side surface portion 43b. The gripping means 60 moves inside the groove. Further, the supply guide 43 is provided so that one end in the longitudinal direction of the bottom surface portion 43a is lower than the other end, and is disposed on the upstream side of the endless belt 41 on the laminated film 10a side.

In the supply means 40, the gripping means 60 is supplied so that the protruding portion 64 is inserted into the hole 41 a using the supply guide 43 in the endless belt 41 that rotates by the movement of the laminated film 10 a.
Further, the rotation of the endless belt 41 moves the gripping means 60 toward the laminated film 10a at regular intervals.
Further, before the gripping means 60 reaches the laminated film 10a, the lever 61c is pulled down by the lever pulling means to separate the pressing portion 61a from the holding surface 62a.
When the gripping means 60 is supplied to the laminated film 10a side by the further rotation of the endless belt 41, the end in the width direction of the laminated film 10a enters between the pressing portion 61a and the clamping surface 62a. Yes. After the end portion in the width direction of the laminated film 10a enters between the holding portion 61a and the holding surface 62a, the lever 61c is pushed up by the lever pushing-up means to bring the holding portion 61a into contact with the holding surface 62a and laminated. The end of the film 10a in the width direction is gripped.
Further, since the endless belt 41 is lowered on the downstream side of the laminated film 10a, when the gripping means 60 holding the laminated film 10a is further moved, the protruding portion 64 comes out of the hole 41a and the gripping means 60 is suspended. It will be in the state of. In the suspended state, the gripping means 60 moves to the upstream end of the rail 30 and is introduced into the rail 30. Since the gripping means 60 is supplied at regular intervals, the gripping means 60 introduced into the rail 30 is separated from the preceding gripping means 60.
As described above, when the gripping means 60 that grips the end of the laminated film 10a in the width direction is introduced into the rail 30, the width direction of the laminated film 10a is constrained to maintain a certain length.

(Conveying means)
The conveying means 50 continuously conveys the gripping means 60 led out together with the laminated film 10 a from the downstream end of the rail 30 so as to be separated from the rail 30.
In the present embodiment, a pair of conveying means 50 is provided above and below a base portion 62 described later of the gripping means 60 that is pushed out and led out from the downstream end of the rail 30, and the base of the gripping means 60 that is led out from the rail 30. The part 62 can be held and conveyed. Further, the conveying means 50 conveys the gripping means 60 derived from the downstream end of the rail 30 while keeping the preceding gripping means 60 and the following gripping means 60 in contact with each other.
Specifically, each of the conveying means 50 includes an endless belt 51 and a driving roll 52 that rotates the endless belt 51, and is arranged so that the base portion 62 can be sandwiched between the pair of endless belts 51, 51. Each endless belt 51 rotates so that a portion on the gripping means 60 side is separated from the rail 30.
Further, the conveying means 50 is provided with lever pulling means (not shown) for pulling down the lever 61c.

The conveying means 50 is configured to hold the base portion 62 between the endless belts 51 and 51 rotated by the driving roll 52 with the gripping means 60 pushed out from the rail 30 and led to the following gripping means 60. The gripping means 60 is conveyed so as to be separated from the rail 30 while being in contact with the gripping means 60. Further, by transporting the gripping means 60 by the transporting means 50, the laminated film 10a gripped by the gripping means 60 can be pulled out from the unwinding roll 20 and transferred. Further, the gripping means 60 supported by the rail 30 is moved along the rail 30 by transferring the laminated film 10a.
Further, immediately before the gripping means 60 finishes passing between the endless belts 51, 51, the lever 61c is pulled down by the lever pulling means to separate the pressing portion 61a from the clamping surface 62a.

(Gripping means)
The plurality of pairs of gripping means 60 are supported by the rail 30 so as to be able to travel, and grip both ends of the laminated film 10a in the width direction.
As shown in FIG. 6, the gripping means 60 includes a clip 61 that grips the end portion in the width direction of the laminated film 10 a, a base portion 62 to which the clip 61 is attached, and a sliding portion 63 that is movably supported by the rail 30. And a protruding portion 64 protruding downward from the base portion 62.
The clip 61 in the present embodiment is connected so as to rotate in synchronization with the pressing portion 61a that holds the laminated film 10a on the base portion 62, a support portion 61b that is rotatably attached to the pressing portion 61a, and the pressing portion 61a. And a lever 61c rotatably attached to the support portion 61b.
The base portion 62 in the present embodiment has a clamping surface 62a for clamping the laminated film 10a, and a support portion 61b is attached to the clamping surface 62a. Further, the length of the base portion 62 in the movement direction (longitudinal direction) of the rail 30 is set to be longer than the length of the other members constituting the gripping means 60 in the longitudinal direction. For this reason, the longer the longitudinal direction of the base portion 62, the longer the pitch between the gripping means 60 and 60 when the preceding gripping means 60 comes into contact.
The sliding portion 63 in the present embodiment is provided on the back side of the base portion 62, includes a wheel 33 a that does not have a drive source, and is disposed inside the rail 30. It is preferable that the sliding portion 63 has a frictional resistance with the rail 30 as small as possible.

In the gripping means 60, when the lever 61c is pulled down, the pressing portion 61a is rotated so as to be separated from the clamping surface 62a, and when the lever 61c is pushed up, the pressing portion 61a is brought into contact with the clamping surface 62a. Is designed to rotate. As the pressing portion 61a moves in this way, the end portion in the width direction of the laminated film 10a can be pressed against the holding surface 62a to be gripped.
The sliding portion 63 is disposed inside the rail 30, and the base portion 62 is disposed so as to pass through the slit 35, so that the grip means 60 travels on the rail 30 while being supported by the rail 30. Further, the gripping means 60 is freely movable in the longitudinal direction of the rail 30 as long as it does not contact the adjacent gripping means 60 in the longitudinal direction.

When the gripping means 60 starts traveling on the rail 30 on the upstream side of the rail 30, the gripping means 60 is separated from the preceding gripping means 60, and the heat-shrinkable film contracts while traveling on the rail 30, The laminated film 10a is gripped so that the distance from the preceding gripping means becomes gradually narrower and eventually comes into contact.
As a method of providing the gripping means 60 in this way, a method of adjusting the length of the base portion 62 in the longitudinal direction, and a method of adjusting the distance between the gripping means 60, 60 in the longitudinal direction by the supply means 40 can be mentioned. That is, the longer the length in the longitudinal direction of the base portion 62, the shorter the interval between the gripping means 60, 60 in the longitudinal direction, the more the heat-shrinkable film contracts, the more the gripping means 60 comes into contact. It becomes easy. In the method of adjusting the length of the base portion 62 in the longitudinal direction, the base portion 62 may be provided with a mechanism that expands and contracts in the longitudinal direction (for example, a mechanism that connects two members with screws and adjusts the length with screws). preferable.
Since the gripping means 60 grips the laminated film 10a as described above, the width direction of the heat-shrinkable film is constrained to maintain a certain length when separated from the preceding gripping means 60. However, the longitudinal direction is not restricted. Therefore, when heated by the heating means 70, the longitudinal direction of the heat-shrinkable film shrinks and can be shortened.
Further, when the gripping means 60 comes into contact with the preceding gripping means 60, not only the width direction of the heat-shrinkable film but also the longitudinal direction is constrained so as to maintain a constant length.

(Heating means)
The heating means 70 heats the portion between the rails 30 of the laminated film 10a.
In the present embodiment, the heating means 70 is configured such that a plurality of tubular lamp bodies 71 in which a plurality of far-infrared lamps are linearly arranged are arranged in parallel. Moreover, the heating means 70 in this embodiment is arrange | positioned so that the tubular lamp body 71 may become parallel in the width direction of the laminated | multilayer film 10a in the double-sided side of the laminated | multilayer film 10a and the upstream of the rail 30. FIG.
The number of tubular lamp bodies 71 in the heating means 70 is appropriately selected according to the target shrinkage rate, etc., and the number of far infrared lamps of the tubular lamp body 71 is appropriately selected according to the width of the laminated film 10a, the heating temperature, and the like. . The wavelength of the infrared lamp is appropriately selected according to the type of heat-shrinkable film. Further, the output of the infrared lamp can be adjusted by controlling the current to be energized.
It is preferable that a reflector is installed on the back of the far infrared lamp. For example, a metal plate made of stainless steel, iron, aluminum or the like can be preferably used as the reflecting plate. Furthermore, it is preferable to use a reflector having a concave mirror surface surrounding the far-infrared lamp because the uniformity of the concavo-convex pattern 12a can be further increased.

<Method for producing uneven pattern forming sheet>
An embodiment of a method for manufacturing the uneven pattern forming sheet 10 using the manufacturing apparatus 1 will be described.

In the manufacturing method of the present embodiment, the laminated film 10 a from the unwinding roll 20 when the gripping means 60 is conveyed by the conveying means 50 and the tensile force generated in the laminated film 10 a and the laminated film generated when heated by the heating means 70. Unwinding is performed using the contraction force of 10a as a driving force.
In this specification, the laminated film 10a is obtained by providing a hard layer on at least one side of a long heat-shrinkable film that shrinks in the longitudinal direction. Moreover, the length means that the length in the longitudinal direction of the laminated film is 1 m or more. The total length of the laminated film 10a varies depending on the type.

Next, the gripping means 60 is supplied by the supply means 40 so that the protrusion 64 is inserted into the hole 41 a of the rotating endless belt 41. Further, before the gripping means 60 reaches the laminated film 10a, the lever 61c is raised by the lever raising means to separate the pressing portion 61a from the holding surface 62a.
Thereafter, when the end portion in the width direction of the laminated film 10a enters between the pressing portion 61a and the sandwiching surface 62a by further rotating the endless belt 41, the lever 61c is pushed up by the lever pushing-up means to press the holding portion. 61a is made to contact the clamping surface 62a and the edge part of the laminated film 10a in the width direction is clamped.
Next, the gripping means 60 sandwiching the laminated film 10a is introduced into the rail 30 at regular intervals by the movement of the laminated film 10a. Thereby, it restrains so that the width direction of the laminated | multilayer film 10a may maintain fixed length.

Next, the upstream side of the rail 30 of the laminated film 10a between the rails 30 is heated by the heating means 70, the longitudinal direction of the heat-shrinkable film of the laminated film 10a is shortened, and the hard layer 12 is folded so as to be folded. Thus, the concave / convex pattern 12a is formed.
In that case, it is preferable that the shrinkage | contraction rate of the longitudinal direction of the laminated | multilayer film 10a is 40% or more. By setting the shrinkage rate to 40% or more in this way, it is possible to manufacture the concavo-convex pattern forming sheet 10 that exhibits sufficient performance when used in an optical element. Moreover, since the area of the uneven | corrugated pattern formation sheet 10 obtained when a shrinkage rate becomes large too much becomes small, it is unpreferable on a yield. From such a viewpoint, the upper limit of the shrinkage rate is preferably 80%.
The shrinkage rate in the present invention is (shrinkage rate [%]) = {(length before shrinkage) − (length after shrinkage)} / (length before shrinkage) × 100.

  As the heat-shrinkable film contracts as described above, the distance between the pair of gripping means 60 traveling on the rail 30 and the preceding gripping means 60 is gradually narrowed, and eventually comes into contact. The gripping means 60 is moved along the rails 30 in the contacted state, thereby restraining not only the width direction but also the longitudinal direction of the heat-shrinkable film to maintain a constant length.

Next, using the conveying means 50, the base portion 62 of the gripping means 60 led out from the downstream end of the rail 30 is sandwiched between a pair of rotating endless belts 51, 51. As a result, the gripping means 60 derived from the rail 30 is transported away from the rail 30 while being in contact with the preceding gripping means 60 and the subsequent gripping means 60.
The conveyance of the gripping means 60 by the transport means 50 serves as a drive source for pulling and moving the laminated film 10 a gripped by the gripping means 60. In addition, the gripping means 60 that grips the laminated film 10 a is moved along the rail 30 by pulling and moving the laminated film 10 a.
Next, immediately before the gripping means 60 finishes passing between the endless belts 51, 51, the lever 61c is pulled down by the lever pulling means to separate the pressing portion 61a from the clamping surface 62a, thereby opening the laminated film 10a. . Thereby, the uneven | corrugated pattern formation sheet 10 is obtained. The separated gripping means 60 is collected and returned to the supply guide 43 of the supply means 40. Moreover, in order to remove the portion gripped by the gripping means 60, the obtained uneven pattern forming sheet 10 may be slit at the end in the width direction.

(Function and effect)
In the above embodiment, when a plurality of pairs of gripping means 60 starts to run on the rail 30, the gripping means 60 is separated from the other gripping means 60 in the longitudinal direction and can run freely with respect to each other. Only can be constrained so as to maintain a certain length, and the longitudinal direction of the heat-shrinkable film can be restrained. Therefore, the longitudinal direction of the heat-shrinkable film can be shrunk to shorten the length, and thereby the concavo-convex pattern 12a can be formed by deforming the hard layer 12 so as to be folded. The step of deforming the hard layer 12 so as to be folded is a “deformation step” in the method for producing a concavo-convex pattern forming sheet of the present invention.
In addition, the heat-shrinkable film is moved not only in the width direction but also in the longitudinal direction by moving the heat-shrinkable film while the plurality of pairs of gripping means 60 and the preceding gripping means 60 are in contact with each other. Can also be constrained to maintain a certain length. Thus, although the width direction and longitudinal direction of a heat-shrinkable film are restrained, the heat-shrinkable film tends to shrink until it is cooled to about room temperature. However, since both the width direction and the longitudinal direction of the heat-shrinkable film are constrained and the deformation of the heat-shrinkable film is impossible, the heat-shrinkable film is pulled in the width direction and the longitudinal direction by the shrinkage. It will be in a state and tension can be given to lamination film 10a. Note that the step of applying tension to the laminated film 10a while moving the gripping means 60 in contact with the gripping means 60 that travels in advance is the “tension applying step” in the concavo-convex pattern forming sheet of the present invention. .
By applying tension as described above, in the obtained concavo-convex pattern forming sheet 10, it is possible to suppress the generation of wrinkles that can be visually recognized irregularly different from the concavo-convex pattern 12 a, and improve the anisotropy of the concavo-convex pattern. Can be made.
Moreover, since the heating means 70 is provided with a far-infrared lamp, the laminated film 10a can be locally and rapidly heated, and tension can be applied to the laminated film 10a more precisely. Occurrence of irregular and visible wrinkles can be further suppressed.

“Second Embodiment”
<Manufacturing equipment>
A second embodiment of the manufacturing apparatus of the present invention will be described.
7 and 8 show the manufacturing apparatus of this embodiment. The manufacturing apparatus 2 of the present embodiment includes an unwinding roll 20, a pair of rails 30, a pair of supply means 40, a pair of conveying means 50, a plurality of pairs of gripping means 60, a heating means 70, and an annealing means. 110, tension adjusting means 120, first tension dividing means 130, second tension dividing means 140, and winding roll 150.
The unwinding roll 20, rail 30, supply means 40, conveying means 50, gripping means 60 and heating means 70 in the present embodiment are the same as the unwinding roll 20, rail 30, supply means 40, conveying means 50 in the first embodiment. The gripping means 60 and the heating means 70 are the same.

  The annealing means 110 heats the laminated film 10a before being gripped by the gripping means 60. The annealing means 110 in the present embodiment is a heater provided to heat the laminated film 10a between the unwinding roll 20 and the supply means 40. As the heater, a heater using a far-infrared lamp may be used similarly to the heating means 70, or a heater heated by hot air may be used.

The tension adjusting unit 120 adjusts the tension in the longitudinal direction of the laminated film 10 a heated by the annealing unit 110. Specifically, the tension adjusting unit 120 in the present embodiment includes a first nip portion 121 including a pair of nip rolls 121a and 121a and a second nip portion 122 including a pair of nip rolls 122a and 122a. The pair of nip rolls 121a and 121a of the first nip portion 121 and the pair of nip rolls 122a and 122a of the second nip portion 122 have the same diameter, and each of the driving means is connected to adjust the rotation speed. ing.
The tension adjusting means 120 can adjust the tension of the laminated film 10a by adjusting the rotational speed of the pair of nip rolls 121a and 121a and the pair of nip rolls 122a and 122a.

The 1st tension | tensile_strength dividing means 130 is divided | segmented so that the tension | tensile_strength adjusted by the tension adjustment means 120 may not be transmitted to the laminated | multilayer film 10a hold | gripped by the holding means 60. FIG. Specifically, the first tension dividing means 130 in the present embodiment is provided between the tension adjusting means 120 and the supply means 40, and is provided downstream of the first guide roll 131 and the first guide roll 131. A dancer roll 132 provided below and a second guide roll 133 provided downstream and above the dancer roll 132 are provided.
The first guide roll 131 and the second guide roll 133 are free rolls to which driving means are not connected, and are fixed in position.
The dancer roll 132 is a free roll that is not connected to the driving means, is applied with a force downward in the vertical direction, and the vertical position is not fixed and can be varied.
In the first tension dividing means 130, the laminated film 10 a is wound around the dancer roll 132, and the laminated film 10 a is pulled upstream of the first guide roll 131 and the second guide roll 133, so that it is upstream of the first guide roll 131. The tension of the laminated film 10a on the side and the tension of the laminated film 10a on the downstream side of the second guide roll 133 are divided.

The second tension dividing means 140 divides the tension generated by the winding of the winding roll 150 so as not to be transmitted to the concavo-convex pattern forming sheet 10 immediately after being released from the gripping means 60 and the winding roll 150 uses the concavo-convex pattern. This prevents wrinkles and sagging when the forming sheet 10 is wound up. Specifically, the second tension dividing means 140 is provided between the conveying means 50 and the take-up roll 150, and is provided downstream and below the first guide roll 141 and the first guide roll 141. A dancer roll 142 and a second guide roll 143 provided downstream and above the dancer roll 142.
The first guide roll 141 and the second guide roll 143 are free rolls to which driving means are not connected, and their positions are fixed.
The dancer roll 142 is a free roll that is not connected to the driving means, is applied with a force downward in the vertical direction, and the vertical position is not fixed and can be varied.
In the second tension dividing means 140, the tension of the uneven pattern forming sheet 10 upstream of the first guide roll 141 and the tension of the uneven pattern forming sheet 10 downstream of the second guide roll 143 are divided. It has become.

  The winding roll 150 is configured to wind up the obtained concavo-convex pattern forming sheet 10 to which driving means is connected.

<Method for producing uneven pattern forming sheet>
An embodiment of a method for manufacturing the concavo-convex pattern forming sheet 10 using the manufacturing apparatus 2 will be described.
The manufacturing method in the present embodiment has a deformation process and a tension application process as in the first embodiment. In addition to these processes, the laminated film 10a before being gripped by the gripping means 60 is annealed by the annealing means. An annealing process is performed.
However, in the manufacturing method of this embodiment, the laminated film 10a is unwound from the unwinding roll 20 by using the rotation of the nip rolls 121a and 121a as a driving force.
In the manufacturing method of this embodiment, the tension adjusting unit 120 adjusts the tension in the longitudinal direction of the laminated film 10a heated by the annealing unit 110.
Further, the first tension dividing means 130 divides the tension of the laminated film 10 a adjusted by the tension adjusting means 120 so as not to be transmitted to the laminated film 10 a held by the holding means 60.
Further, the second tension dividing unit 140 divides the tension generated by the winding of the winding roll 150 so as not to be transmitted to the concavo-convex pattern forming sheet 10 immediately after being released from the gripping unit 60.
Moreover, the uneven | corrugated pattern formation sheet 10 which passed the 2nd tension | tensile_strength dividing means 140 is wound up with the winding roll 150, and is made into roll shape.

Annealing step in the production method of the present embodiment, the laminated film before being gripped by the gripping means 60 is heated at a temperature T ₁ of a process of annealing (thermal relaxation treatment).
Temperature T ₁ of the annealing process, to a temperature lower than the heating temperature T ₂ during the deformation step. If T ₁ is T ₂ or more, the uneven pattern may be non-uniform.
Further, T ₁ is more preferably 5 ° C. or more lower than T ₂ , and more preferably 10 ° C. or less.

Temperature T ₁ of the annealing step as described above, but the treatment at a temperature lower than the temperature T ₂ of the deformation step, with no tension is laminate film 10a is slightly contracted. However, since the purpose of this process is to relieve the stress generated in the easily shrinkable portion and to make the shrinkage of the laminated film 10a uniform by heat shrinkage in the next deformation process, the laminated film 10a does not change in dimensions. It is preferable to be restrained and conveyed. Specifically, the rotational speed of the nip roll 122a does not become slower than the rotational speed of the nip roll 121a, and the rotational speed of the nip roll 122a with respect to the rotational speed of the nip roll 121a is adjusted to a speed close to 100%. preferable. More specifically, it is preferable that the rotation speed of the nip roll 122a is adjusted within a range of 100 to 102% with respect to the rotation speed of the nip roll 121a.

  In the present embodiment, it is preferable to contract at a contraction rate of 20 to 50% at the time of heat contraction in the deformation step. If the shrinkage rate is set to the lower limit value or more, the non-shrinkable region can be reduced, and if the shrinkage rate is set to the upper limit value or less, sufficient luminance can be obtained while increasing the light diffusibility.

  Also in this embodiment, you may slit the edge part of the width direction of the uneven | corrugated pattern formation sheet 10 obtained. When slitting the concavo-convex pattern forming sheet 10 in the present embodiment, the slitter is preferably provided between the second tension dividing means 140 and the take-up roll 150.

(Function and effect)
In this embodiment, the stress which has arisen in the part which is easy to shrink | contract the laminated | multilayer film 10a can be relieve | moderated by annealing the laminated | multilayer film 10a. Therefore, the shrinkability of the laminated film 10a at the time of heat shrinkage can be made uniform throughout, and the uneven pattern forming sheet 10 with few unshrinked regions can be easily manufactured.
Moreover, the stress relaxation of the laminated film 10a can be adjusted by adjusting the tension of the laminated film 10a before being held by the holding means 60 by the tension adjusting means 120.
Further, the tension adjusted by the tension adjusting means 120 is divided by the first tension dividing means 130 so that the tension adjusted by the tension adjusting means 120 is not transmitted to the laminated film 10a held by the holding means 60. The laminated film 10a can be heated and shrunk without being affected. Further, the tension of the laminated film 10a can be adjusted without being affected by the heat shrinkage.
Therefore, by providing the tension adjusting means 120 and the first tension dividing means 130, the laminated film 10a can be further prevented from shrinking with unevenness, and the number of unshrinked areas can be reduced.
Further, the second tension dividing means 140 divides the tension generated by winding the winding roll 150 so as not to be transmitted to the concavo-convex pattern forming sheet 10 immediately after being released from the gripping means 60, thereby forming the concavo-convex pattern. Application of excessive tension to the sheet 10 can be suppressed. Therefore, it becomes easy to form the target concavo-convex pattern 12a. In addition, the second tension dividing means 140 can prevent wrinkles and sagging when the concavo-convex pattern forming sheet 10 is taken up by the take-up roll 150.

(Other embodiments)
In addition, this invention is not limited to the said embodiment.
For example, the clip 61 of the gripping means 60 is not limited to that of the above embodiment, and a known clip for gripping a resin film can be used without limitation. Moreover, the sliding part 63 does not have a wheel, The sliding part 63 itself may be comprised with the material which is easy to slide within the rail 30. FIG.
The heating means 70 may have only one tubular lamp body 71. Moreover, the heating means 70 does not need to use a far-infrared lamp, and may be one heated by water vapor or one heated by hot air. Moreover, in the said embodiment, although the installation position of the heating means 70 was the upstream of the rail 30, near the center of the rail 30 and the downstream of the rail 30 may be sufficient.
As for the transport means 50 and the supply means 40, any mechanism other than the above embodiment can be used without any limitation as long as it has a mechanism capable of transporting or supplying the gripping means 60.
In the manufacturing apparatus of the first embodiment, the same second tension dividing means as that used in the second embodiment may be provided.

  When the laminated film is annealed, the annealed laminated film may be wound up into a roll shape, and the annealed laminated film may be unwound from the roll during heat shrinkage. When the laminated film that has been annealed is wound up, the production of the uneven pattern forming sheet can be made flexible.

  The concavo-convex pattern forming sheet produced according to the present invention includes, for example, an antireflection body, a light diffuser, a phase difference plate, a polarizing plate, a polishing film, a cell culture sheet, an electrolyte membrane for fuel cells, a release sheet, an antiblocking sheet, It can be used for an easy-adhesion sheet, a printability improving sheet, and the like. Moreover, it can also be used as an original sheet for duplicating and producing the said sheet | seat.

1, 2 Manufacturing equipment (Manufacturing equipment for uneven pattern forming sheet)
DESCRIPTION OF SYMBOLS 10 Asperity pattern formation sheet 10a Laminated film 11 Base material 12 Hard layer 12a Asperity pattern 12b Convex part 12c Concave 20 Unwinding roll 30 Rail 31 1st side surface part 32 2nd side surface part 33 Upper surface part 34 Lower surface part 35 Slit 40 Supply means 41 Endless belt 42 Roll 43 Supply guide 43a Bottom surface portion 43b Side surface portion 50 Conveying means 51 Endless belt 52 Drive roll 60a, gripping means 61 Clip 61a Holding portion 61b Support portion 61c Lever 62 Base portion 62a Holding surface 63 Sliding portion 64 Protruding portion 70 Heating Means 71 Tubular lamp body 110 Annealing means 120 Tension adjusting means 121 First nip part 121a Nip roll 122 Second nip part 122a Nip roll 130 Tension dividing means 131 First guide roll 132 Dancer roll 13 3 Second Guide Roll 140 Tension Dividing Unit 141 First Guide Roll 142 Dancer Roll 143 Second Guide Roll 150 Winding Roll

Claims (9)

A method for producing a concavo-convex pattern forming sheet that shrinks the heat-shrinkable film by heating a laminated film provided with a hard layer on at least one side of a long heat-shrinkable film that shrinks in the longitudinal direction by heating ,
Deformation step of deforming to fold the hard layer by shortening the longitudinal direction of the heat-shrinkable film by heating only in the width direction of the laminated film while maintaining a certain length after the deformation process, the while shrinking force of the heat shrinkable film is left, to restrain both the width direction and the longitudinal direction of the laminated film so as to maintain a constant length, tension to the laminate film A method for producing a concavo-convex pattern-forming sheet, comprising: a tension applying step for imparting.   The manufacturing method of the uneven | corrugated pattern formation sheet of Claim 1 which irradiates far infrared rays in the heating of the said laminated | multilayer film.   The manufacturing method of the uneven | corrugated pattern formation sheet of Claim 1 or 2 which has an annealing process of heating and annealing a laminated | multilayer film at the temperature lower than the heating temperature in the deformation process before the said deformation | transformation process.   The uneven | corrugated pattern formation sheet of Claim 3 which cut | disconnects so that the tension | tensile_strength in the longitudinal direction of the laminated | multilayer film currently annealed may be adjusted and the said tension may not be transmitted to the laminated | multilayer film deform | transformed in the said deformation | transformation process. Manufacturing method. By heating a laminated film in which a hard layer is provided on at least one side of a long heat-shrinkable film that shrinks in the longitudinal direction by heating, the heat-shrinkable film is shrunk and deformed so that the hard layer is folded. An apparatus for producing a concavo-convex pattern forming sheet for forming a concavo-convex pattern,
A plurality of pairs of gripping means for gripping both end sides in the width direction of the laminated film so as to maintain a constant width; and the plurality of pairs of gripping means when the heating of the laminated film is started Is configured to grip the laminated film so as to come into contact with the other gripping means in the longitudinal direction by separating from the other gripping means in the longitudinal direction and then the heat-shrinkable film shrinks. The manufacturing apparatus of the uneven | corrugated pattern formation sheet characterized by these. The heat- shrinkable film is shrunk by heating while continuously moving the laminated film provided with a hard layer on at least one side of the long heat-shrinkable film that shrinks in the longitudinal direction by heating, An apparatus for producing a concavo-convex pattern forming sheet for forming a concavo-convex pattern by deforming so as to fold a hard layer,
A plurality of pairs of gripping means for gripping both end sides in the width direction of the laminated film;
A pair of linear rails are provided so as to extend along the respective widthwise ends of the laminated film, and support the plurality of pairs of gripping means so as to be able to travel;
A pair of supply means for supplying gripping means to grip the laminated film before traveling between the pair of rails;
A pair of conveying means for conveying the gripping means led out together with the laminated film from the downstream end of the laminated film running direction of each rail so as to be separated from the rail;
A heating means for heating a portion between the pair of rails of the laminated film held by the holding means;
The plurality of pairs of gripping means are separated from the preceding gripping means when starting to travel on the rail, and the heat-shrinkable film contracts while traveling on the rail so as to come into contact with the preceding gripping means. In addition, it is designed to grip the laminated film,
Each conveying means is configured to convey the gripping means derived from the downstream end of each rail in the laminated film running direction while keeping the preceding gripping means and the following gripping means in contact with each other.
The apparatus for producing a concavo-convex pattern forming sheet, wherein the laminated film is moved by conveying a plurality of pairs of gripping means by the conveying means.   The manufacturing apparatus of the uneven | corrugated pattern formation sheet of Claim 6 whose said heating means is a far-infrared lamp.   The manufacturing apparatus of the uneven | corrugated pattern formation sheet as described in any one of Claims 5-7 which comprises the annealing means which heats and anneals the laminated film before being hold | gripped by the said holding means.   Tension adjusting means for adjusting the longitudinal tension of the laminated film heated by the annealing means, and tension for dividing the tension adjusted by the tension adjusting means so as not to be transmitted to the laminated film held by the holding means The manufacturing apparatus of the uneven | corrugated pattern formation sheet of Claim 8 which comprises a parting means.

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