WO2012132650A1 - 凹凸シート及びその製造方法 - Google Patents
凹凸シート及びその製造方法 Download PDFInfo
- Publication number
- WO2012132650A1 WO2012132650A1 PCT/JP2012/054218 JP2012054218W WO2012132650A1 WO 2012132650 A1 WO2012132650 A1 WO 2012132650A1 JP 2012054218 W JP2012054218 W JP 2012054218W WO 2012132650 A1 WO2012132650 A1 WO 2012132650A1
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- Prior art keywords
- sheet
- concavo
- resin sheet
- convex
- belt
- Prior art date
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
- B32B3/04—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by at least one layer folded at the edge, e.g. over another layer ; characterised by at least one layer enveloping or enclosing a material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/222—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/04—Bending or folding of plates or sheets
- B29C53/043—Bending or folding of plates or sheets using rolls or endless belts
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
- G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
- B29L2011/005—Fresnel lenses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
- Y10T156/1007—Running or continuous length work
- Y10T156/1008—Longitudinal bending
- Y10T156/1011—Overedge bending or overedge folding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/23—Sheet including cover or casing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/2419—Fold at edge
- Y10T428/24215—Acute or reverse fold of exterior component
- Y10T428/24231—At opposed marginal edges
Definitions
- the present invention relates to a concavo-convex sheet and a method for manufacturing the concavo-convex sheet, and particularly relates to a concavo-convex sheet in which a concavo-convex pattern serving as a lens is formed on one surface of the sheet and wound in a roll shape in the manufacturing process, and a manufacturing method therefor.
- Fresnel lenses, lenticular lenses, etc. as resin concavo-convex sheets used for various optical elements, and they are used in various fields.
- a regular concavo-convex pattern serving as a lens is formed on the surface of the concavo-convex sheet, and the optical performance is exhibited by the concavo-convex pattern.
- an extrusion molding method, an extrusion lamination method, and a 2P method are generally used as a method for producing such a concavo-convex sheet.
- a belt-shaped resin sheet obtained by extruding a thermoplastic molten resin into a sheet shape from an extrusion die is nipped between a mold roller and a nip roller, and the inverted shape of the uneven pattern formed on the mold roller is transferred to the resin sheet. Then, the transferred resin sheet is peeled off from the mold roller. And the strip
- the extrusion laminating method is a method of laminating a belt-like substrate as a support on a resin sheet extruded from an extrusion die, and the other is the same as the extrusion molding method.
- a UV (ultraviolet) curable resin is applied to a support, then wrapped on a mold roller, and irradiated with UV light while being wrapped, the inverted shape of the concavo-convex pattern formed on the mold roller is applied to the resin sheet.
- the transferred resin sheet is peeled off from the mold roller. And it is the method of winding up the peeled strip
- the concavo-convex sheet 2 having the concavo-convex pattern 1 formed on the sheet surface is wound by the winding device as shown in FIG.
- the convex portion 1A of the concavo-convex pattern 1 is crushed as shown in FIG. 9B by the winding pressure by the winding tension, and there is a problem that optical performance is not exhibited.
- Patent Document 1 discloses a technique for performing a knurling process in which a large number of spherical protrusions are formed at both ends in the film width direction, thereby preventing winding slippage during winding. .
- Patent Document 2 introduces an improved technique of Patent Document 1. That is, as disclosed in Patent Document 1, since the spherical protrusions are not sufficiently formed even if the knurling process is performed on the film that has not been softened after being manufactured, the embossing roller is applied to the film that is soft when the film is extruded. It is proposed to do the knurling process.
- Patent Documents 1 and 2 do not have a problem of preventing the protrusions of the concavo-convex pattern formed on the sheet surface from being crushed when winding the concavo-convex sheet into a roll, and are based on countermeasures for solving the problem. It is not done.
- the present invention has been made in view of such circumstances, and since the concave / convex pattern is not crushed even when wound up in a roll shape, the original function of the concave / convex pattern such as optical performance can be exhibited.
- An object is to provide an uneven sheet and a method for producing the same.
- the uneven sheet according to the present invention has an uneven pattern formed on the surface of a belt-like sheet and wound into a roll shape.
- a strip-shaped step portion having a sheet thickness greater than that of other portions is formed along the direction.
- the strip-shaped step portions having a thicker sheet thickness than other portions are formed along the longitudinal direction of the sheet at both ends in the sheet width direction. Therefore, when the concavo-convex sheet is wound into a roll, the strip-shaped stepped portion comes into contact with the strip-shaped stepped portion of the concavo-convex sheet to be wound next. As a result, a gap due to the band-shaped step portion is formed between the roll layers of the uneven sheet wound in a roll shape.
- the winding pressure of the winding tension for winding the concavo-convex sheet in a roll shape can be supported by the belt-shaped step portion, so that the belt-shaped step portion is not applied to the convex portion of the concavo-convex pattern or even if applied.
- the applied winding pressure can be remarkably reduced. Therefore, even if the concavo-convex sheet is rolled up, the concavo-convex pattern formed on the sheet surface is not crushed, so that the original function of the concavo-convex pattern such as optical performance can be exhibited.
- the concavo-convex sheet of the present invention has a structure in which a belt-like substrate is laminated on a resin sheet on which the concavo-convex pattern is formed, and both ends of the resin sheet formed wider than the belt-like substrate. It is preferable that the belt-shaped stepped portion is formed by bending and bonding a portion to the back surface of the belt-shaped substrate.
- the band-shaped stepped portion includes convex portions at both ends in the width direction of the concave-convex pattern, and the concave-convex pattern between the strip-shaped stepped portions formed in the concave-convex sheet width direction may be a product portion. preferable.
- the band-shaped stepped portion to include the convex portions at both ends in the width direction of the concave-convex pattern, it corresponds to the thickness of the protruding portion between the roll layers of the concave-convex sheet wound in a roll shape. It is possible to reliably form a gap.
- the concavo-convex sheet of the present invention has a structure in which a belt-like substrate is laminated on a resin sheet on which the concavo-convex pattern is formed, and both ends of the resin sheet formed wider than the belt-like substrate. It is preferable that the band-shaped step portion is formed by bending and bonding the portion so as to overlap the convex portions at both ends in the width direction of the concave-convex pattern formed on the resin sheet.
- the concavo-convex pattern preferably has optical performance. This is because, for example, crushing of convex portions of a concavo-convex pattern having optical performance such as a lenticular lens becomes a problem.
- the method for producing a concavo-convex sheet provides a method for producing a concavo-convex sheet in which a concavo-convex pattern is formed on a sheet surface.
- a belt-like substrate supplying step to supply, and a thermoplastic molten resin is extruded from the extrusion die into a sheet shape to form a belt-like resin sheet wider than the belt-like substrate, and the formed resin sheet is formed into the mold roller and the belt-like shape
- a resin sheet supplying step of supplying the nip point so as to be between the base material, and the resin sheet supplied to the nip point and the belt-like base material are nipped by the mold roller and the nip roller, thereby the resin sheet Is laminated on the belt-like substrate, and the resin sheet is cooled after transferring the inverted shape of the uneven pattern formed on the mold roller to the resin sheet.
- a transfer step, a peeling step for peeling the belt-like substrate laminated with the resin sheet after the transfer step from the mold roller, and after the peeling step, both ends of the wide resin sheet are attached to the back surface of the belt-like substrate.
- the manufacturing method of the present invention it is possible to form a strip-shaped step portion having a thicker sheet thickness than other portions along the longitudinal direction of the sheet at both ends in the sheet width direction.
- the band-shaped step portion functions as a bridge girder so that the concavo-convex pattern is not crushed. Therefore, the concavo-convex sheet can exhibit the original functions of the concavo-convex pattern such as optical performance.
- the band-shaped stepped portion is simply bent and bonded to the back surface of the band-shaped substrate at both ends of the wide resin sheet, the band-shaped stepped portion can be formed easily and reliably.
- the resin sheet and the adhesive resin layer are formed from the extrusion die so that an adhesive resin layer is formed on the back side of the resin sheet extruded from the extrusion die. Is preferably coextruded.
- the method for producing a concavo-convex sheet provides a method for producing a concavo-convex sheet in which a concavo-convex pattern is formed on a sheet surface.
- a belt-like substrate supplying step to supply, and a thermoplastic molten resin is extruded from the extrusion die into a sheet shape to form a belt-like resin sheet wider than the belt-like substrate, and the formed resin sheet is formed into the mold roller and the belt-like shape
- a resin sheet supplying step of supplying the nip point so as to be between the base material, and the resin sheet supplied to the nip point and the belt-like base material are nipped by the mold roller and the nip roller, thereby the resin sheet Is laminated on the belt-like substrate, and the resin sheet is cooled after transferring the inverted shape of the uneven pattern formed on the mold roller to the resin sheet.
- a transfer step, a peeling step of peeling the belt-like substrate laminated with the resin sheet after the transfer step from the mold roller, and an uneven pattern of the resin sheet on both ends of the wide resin sheet after the peeling step A folding step of bending so as to overlap with a part of the sheet, an adhesion step of adhering the bent portion to the overlap portion of the resin sheet, and a belt-like base material on which the resin sheet is laminated after the adhesion step in a roll shape A winding step for winding.
- a belt-like substrate having a rigidity higher than that of the resin sheet By laminating the belt-like base material having a rigidity higher than that of the resin sheet, the rigidity of the manufactured concavo-convex sheet becomes stronger than that of the resin sheet alone. Thereby, when a concavo-convex sheet is wound up in a roll shape, the concavo-convex sheet becomes difficult to bend between the strip-shaped step portions, so that the role of the strip-shaped step portion as a bridge girder can be further enhanced. If the uneven sheet is bent between the band-shaped stepped portions because the rigidity of the uneven sheet is small, the uneven pattern near the band-shaped stepped portion is not crushed, but the uneven pattern separated from the band-shaped stepped portion is easily crushed.
- the concavo-convex pattern is not crushed even if it is wound up in a roll shape, so that the original function of the concavo-convex pattern such as optical performance can be exhibited.
- FIG. 1 is a schematic side view of a manufacturing apparatus 10 that performs the method for manufacturing an uneven sheet according to an embodiment of the present invention
- FIG. 2 is a partial perspective view of the manufacturing apparatus 10.
- the dried thermoplastic raw material resin is put into an extruder 14 through a hopper 12 and melted while being kneaded.
- the extruder 14 may be either a single-screw extruder or a multi-screw extruder, and may include a vent function that evacuates the interior of the extruder 14.
- the extrusion die 18 mainly includes a manifold 18A that spreads the molten resin sent from the extruder 14 in the die width direction, and a slit 18B that is a narrow flow path and extrudes the spread molten resin in a sheet shape to the outside. It consists of.
- a feed block 19 is provided between the supply pipe 16 and the extrusion die 18 so that a plurality of molten resins can be joined together to form a multilayer, and the resin sheet 20 and the adhesive resin layer 21 (see FIG. 4) Is preferably coextruded.
- an extruder for melting the adhesive resin layer 21 is not shown.
- the belt-like base material 24 is fed from the feeding device 22 and supplied to the nip point P between the mold roller 26 and the nip roller 28 rotating in the direction of the arrow, while being wider than the width of the belt-like base material 24 from the extrusion die 18.
- a resin sheet 20 is extruded and supplied to the nip point P. In this case, as shown in FIG. 2, the sheet is supplied to the nip point P so that the center line C1 of the belt-like substrate 24 and the center line C2 of the resin sheet 20 coincide.
- a reverse surface 32 of the concavo-convex pattern 30 transferred to the resin sheet 20 is formed on the roller surface of the mold roller 26.
- a cooling means (not shown) for keeping the roller surface at a low temperature is provided inside the mold roller 26.
- the resin sheet 20 and the belt-like base material 24 are nipped by the mold roller 26 and the nip roller 28, the resin sheet 20 is laminated on the surface of the belt-like base material 24, and the inverted shape 32 of the mold roller 26 is formed.
- the pattern 30 is transferred to the surface of the resin sheet 20, and the concave / convex pattern 30 is formed on the surface of the resin sheet 20.
- the belt-like substrate 24 having the uneven pattern 30 transferred onto the surface of the resin sheet 20 is peeled off from the mold roller 26 by the peeling roller 38.
- the strip-shaped base material 24 that has been peeled passes through the bending device 35.
- the bending device 35 is a device that bends the protruding portion 20 ⁇ / b> A of the wide resin sheet 20 to the back surface of the belt-like substrate 24 and adheres it to the belt-like substrate 24. Any bending device may be used as long as it can perform such bending. For example, as shown in FIG. 2, it is possible to use a device in which a bending roller 35A, a bending cylinder 35B, and a pair of upper and lower pressure rollers 35C are combined. it can.
- a pair of bending rollers 35A are provided spaced apart at the same interval as the width of the belt-like substrate 24, and in contact with the protruding portions 20A at both ends of the resin sheet 20 in an inverted V shape. As a result, the protruding portion 20A is folded along the both ends of the belt-like substrate 24 in the direction of the arrow in the portion (A) of FIG.
- a guide plate capable of folding the protruding portion 20A of the resin sheet 20 to the back side of the belt-like substrate 24 as the belt-like substrate 24 advances is formed on the inner surface of the bending cylinder 35B.
- the protruding portion 20 ⁇ / b> A is bent to the back surface of the belt-like base material 24 as shown in FIG.
- the protruding portion 20 ⁇ / b> A bent to the back surface is nipped from above and below by the pressure roller 35 ⁇ / b> C, and the protruding portion 20 ⁇ / b> A is bonded to the back surface of the belt-like substrate 24 through the adhesive resin layer 21.
- the strip-shaped step part 34 is formed in the both ends of a sheet
- the thickness H1 of the band-shaped step portion 34 is thicker than the thickness H2 of other portions.
- step-difference part 34 of the resin sheet 20 is a non-product area
- the concavo-convex sheet 40 is provided with, for example, a lenticular lens as the concavo-convex pattern 30 and has strip-shaped step portions 34 along the longitudinal direction of the sheet at both ends in the sheet width direction.
- a lenticular lens it is preferable that the lenticular lens is provided on the surface of the entire resin sheet (corresponding to H2) in the range of 50 to 300 ⁇ m.
- the shape of the lenticular lens is preferably formed with a radius of curvature (R) of 100 to 200 ⁇ m, a lens height (h) of 30 to 100 ⁇ m, and a span (S) of 100 to 318 ⁇ m.
- the concavo-convex sheet 40 is wound around the winding shaft 42 ⁇ / b> A of the winding device 42 in a roll shape.
- FIG. 6A is a conceptual diagram in which the concavo-convex sheet 40 is wound in a roll shape
- FIG. 6B is a cross-sectional view taken along the line AA of FIG. 6A. It is.
- corrugated sheet 40 should actually be wound in the shape of a spiral, in (A) part of FIG. 6, it simplified and the roll shape was drawn concentrically.
- the dark color part of the (A) part of FIG. 6 is the strip
- a band-shaped stepped portion 34 is formed along the longitudinal direction of the resin sheet 20 at both ends of the uneven sheet 40 manufactured as described above.
- the band-shaped step 34 formed on the concavo-convex sheet 40 ⁇ / b> A in the first turn is wound. It contacts the belt-like stepped portion 34 of the concavo-convex sheet 40B on the second round. Similarly, in the second and subsequent windings, the belt-like stepped portion 34 comes into contact with the belt-like stepped portion 34 of the uneven sheet 40 to be wound next. As a result, a gap 41 is formed by the band-shaped step portion 34 between the roll layers of the uneven sheet 40 wound in a roll shape.
- the winding pressure of the winding tension for winding the concavo-convex sheet 40 in a roll shape can be supported by the band-shaped step portion 34, the winding pressure is not applied to or applied to the convex portion 30A of the concavo-convex pattern 30. Also, the winding pressure applied can be significantly reduced as compared with the case where there is no belt-like step 34. Therefore, even if the concavo-convex sheet 40 is rolled up, the concavo-convex pattern 30 formed on the sheet surface is not crushed, so that the original function of the concavo-convex pattern such as optical performance can be exhibited.
- the band-shaped stepped portion 34 includes convex portions 30 ⁇ / b> A at both ends in the width direction of the uneven pattern 30, and the uneven pattern 30 between the band-shaped stepped portions 34.
- a product part is preferred.
- a gap 41 corresponding to the thickness of the protruding portion 20 ⁇ / b> A can be reliably formed between the roll layers between the concavo-convex sheet 40 in the first turn and the concavo-convex sheet 40 in the second turn. Therefore, if the protruding portion 20A having a thickness corresponding to the degree of collapse of the convex portion 30A of the concave / convex pattern 30 when the concave / convex sheet 40 without the belt-shaped step portion 34 is wound is formed, the concave / convex pattern 30 can be reliably prevented from being crushed. .
- the folding direction of the protruding portion 20A is not the back surface of the belt-like substrate 24, but overlaps the convex portions 30A at both ends of the concave-convex pattern 30 of the resin sheet 20, as indicated by the arrows in FIG. 7A. It is a case where it folds and adheres. In this case, it is preferable to provide an application process in which the adhesive 23 is applied to the upper surface of the protruding portion 20A after the strip-like substrate 24 on which the resin sheet 20 is laminated is peeled from the peeling roller 38.
- the concavo-convex sheet 40 includes, for example, a lenticular lens as the concavo-convex pattern 30, and has strip-shaped step portions 34 along the longitudinal direction of the sheet at both ends in the sheet width direction. Is formed. Also in this case, the winding pressure for winding the concavo-convex sheet 40 in a roll shape can be supported by the band-shaped step portion 34, so that the winding pressure is not applied to the convex portion 30 ⁇ / b> A of the concavo-convex pattern 30. Even if it is, the winding pressure applied compared with the case where there is no strip
- a belt-like substrate 24 having a rigidity higher than that of the resin sheet 20 as a support.
- corrugated sheet 40 becomes stronger than the case where only the resin sheet 20 is used.
- the concavo-convex sheet 40 is wound up in a roll shape, for example, the concavo-convex pattern 30 on the first turn of the winding becomes difficult to bend between the band-shaped step portions 34 of the concavo-convex pattern 30 on the first turn of the winding.
- the role of the band-shaped step part 34 as a bridge girder can be further enhanced.
- the unevenness sheet 40 has a small rigidity and the unevenness sheet 40 bends between the band-shaped stepped portions 34, the uneven pattern 30 near the band-shaped stepped portion 34 is not crushed, but the uneven pattern 30 separated from the band-shaped stepped portion 34 is easily crushed. Become.
- the belt-like uneven sheet 40 is not used as an optical element as it is, but is unwound from the winding device 42 and conveyed to a punching process (not shown). In this punching process, the uneven sheet 40 is punched into a predetermined size (for example, 12.7 cm ⁇ 17.8 cm). At the time of this punching, it is necessary to punch in parallel to the ridgeline of the lenticular lens.
- the edge position controller controls the travel of the concavo-convex sheet so that the punching blade is parallel to the ridge line of the lenticular lens with the end of the concavo-convex sheet 40 as a reference.
- the travel control by EPC can be stabilized.
- the concave / convex pattern 30 is not crushed even if it is wound in a roll shape, the original function of the concave / convex pattern such as optical performance can be exhibited. Further, as a secondary effect of the band-shaped stepped portion 34, it can be used as a reference line for running control of the concavo-convex sheet 40 for accurate punching.
- the example of the lenticular lens is described as an example of the concavo-convex pattern 30, but as shown in FIGS. 8A and 8B, the quadrangular pyramid-shaped convex portions 30A are formed in a lattice shape.
- the uneven pattern 30 may be used.
- the height h of the quadrangular pyramid-shaped convex part 30A is in the range of 20 to 50 ⁇ m and the span S is in the range of 10 to 100 ⁇ m.
- the belt-like substrate 24, the resin sheet 20, the adhesive resin layer 21, the extrusion die 18 of the manufacturing apparatus 10, and the rollers 26, 28, and 38 in the present embodiment will be described.
- the belt-like substrate 24 preferably has a surface that is as smooth as possible and is larger than the rigidity of the resin sheet 20 to be laminated. Moreover, when the uneven
- the strip-shaped substrate 24 preferably has a thickness of 100 ⁇ m to 300 ⁇ m, and more preferably has a thickness of 160 ⁇ m to 210 ⁇ m.
- the resin that forms the resin sheet 20 examples include polymethyl methacrylate resin (PMMA), polycarbonate resin, polystyrene resin, methacrylate-styrene copolymer resin (MS resin), acrylonitrile-styrene copolymer resin (AS resin), and polypropylene resin.
- PMMA polymethyl methacrylate resin
- MS resin methacrylate-styrene copolymer resin
- AS resin acrylonitrile-styrene copolymer resin
- Polypropylene resin Polyethylene resin, polyethylene terephthalate resin, glycol-modified polyethylene terephthalate resin, polyvinyl chloride resin (PVC), thermoplastic elastomer, or a copolymer thereof, cycloolefin polymer, and the like.
- polymethyl methacrylate resin PMMA
- polycarbonate resin polystyrene resin
- methacrylate-styrene copolymer resin MS resin
- polyethylene resin polyethylene terephthalate resin
- glycol modified polyethylene terephthalate resin etc. It is preferable to use a resin having a low melt viscosity, and it is more preferable to use a glycol-modified polyethylene terephthalate resin (such as PETG) in consideration of ease of transfer, resistance to cracking of the sheet, durability of the uneven pattern 30 and the like.
- PETG glycol-modified polyethylene terephthalate resin
- the adhesive resin layer 21 has a function for adhering the belt-like substrate 24 and the resin sheet 20.
- the adhesive resin layer 21 preferably further has a cushion function.
- the cushion function refers to having a function of absorbing a winding pressure when a winding pressure by a winding tension is applied to the convex portion 30A of the concave / convex pattern 30 when the concave / convex sheet 40 is wound.
- Examples of the adhesive resin layer 21 having both adhesiveness and cushioning properties include modified polyolefin resins and polyester thermoplastic elastomers.
- the adhesive resin layer 21 preferably has a thickness of 10 ⁇ m to 66 ⁇ m, and more preferably has a thickness of 5 ⁇ m to 10 ⁇ m.
- the extrusion die 18 preferably has a function capable of adjusting the extrusion temperature of the resin sheet 20. That is, the extrusion temperature of the resin sheet 20 extruded from the extrusion die 18 is adjusted, and is set so that the temperature of the resin sheet 20 at the nip portion P is equal to or higher than the glass transition temperature. This is to prevent the resin sheet 20 that has been nipped from being cooled and solidified before the transfer from the mold roller 26 is completed. Further, when the thermal decomposition of the resin occurs, problems such as deterioration of the surface of the manufactured uneven sheet 40 are caused. Therefore, it is preferable to set the extrusion temperature to be extruded from the extrusion die 18 as low as possible. When a glycol-modified polyethylene terephthalate resin is used as the resin material, the discharge temperature from the extrusion die 18 can be 240 to 300 ° C., preferably 250 to 290 ° C.
- nip roller 28 various steel members, stainless steel, copper, zinc, brass, or a metal material of which these materials are used and a rubber lining on the surface can be suitably used.
- a pressure means can be provided on the nip roller.
- a back-up roller is further provided on the back surface of the nip roller (on the opposite side of the mold roller) so that bending due to the reaction force of the nip pressure is less likely to occur.
- the peeling roller 38 is provided on the opposite side of the nip roller 28 so as to face the mold roller 26, and is a roller for peeling the surface of the resin sheet 20 from the mold roller 26 by winding the belt-like substrate 24.
- a material of the peeling roller 38 various steel members, stainless steel, copper, zinc, brass, or a material in which these metal materials are used as a core metal and a rubber lining on the surface can be adopted.
- the temperature of the mold roller 26 is set so that the temperature of the resin sheet 20 at the nip portion P is equal to or higher than the glass transition temperature. This is to prevent cooling and solidification before the transfer from the mold roller 26 to the resin sheet 20 is completed.
- the temperature of the mold roller 26 is preferably set as low as possible as long as transfer is possible.
- the surface temperature of the mold roller 26 can be 30 to 90 ° C., preferably 40 to 70 ° C.
- known means such as filling the mold roller 26 with a heat medium (warm water, oil) and circulating it can be employed.
- a mold roller 26 having a diameter of 500 mm and a surface length of 1000 mm and having a concavo-convex pattern 30 shown in part (A) of FIG. 3 was used. That is, the convex / concave pattern 30 of the lenticular lens type has a curvature radius (R) of the convex portion 30A of 150 ⁇ m, a convex portion height (H) of 70 ⁇ m, and a span (S) between the convex portions 30A of 254 ⁇ m.
- R curvature radius
- H convex portion height
- S span
- PETG was used as a resin raw material extruded from the extrusion die 18, and a biaxially stretched PET (polyethylene terephthalate) film having a thickness of 180 ⁇ m and a width of 700 mm was used as the belt-like substrate 24.
- the resin sheet 20 was extruded from the extrusion die 18 so that the extrusion laminate width was 750 mm and nipped between the mold roller 26 and the nip roller 28.
- the extrusion temperature of the extrusion die 18 was 280 ° C.
- the temperature of the mold roller was 40 ° C.
- laminate films each having a protruding portion 20 ⁇ / b> A protruding from both sides in the width direction of the belt-like base material 24 were formed with a width of 25 mm.
- the protruding portion 20A of the laminate film was bent as shown in FIG. 4 (B) by using the bending device 35 of FIG. Thereby, the uneven
- FIG. The winding tension when winding was 500 N / sheet width.
- the concavo-convex sheet 40 of the comparative example manufactured without forming or bending the protruding portion 20A has a semi-cylindrical shape at a plurality of locations in the length direction of the lenticular lens in the winding roll wound around the winding device 42.
- the top was flattened (see part (B) in FIG. 9), and the lens shape was broken.
- SYMBOLS 10 Manufacturing apparatus of a concavo-convex pattern, 12 ... Hopper, 14 ... Extruder, 16 ... Supply pipe, 18 ... Extrusion die, 19 ... Feed block, 20 ... Resin sheet, 22 ... Delivery device, 24 ... Strip base material, 26 ... Mold roller, 28: Nip roller, 30: Concave / convex pattern, 30A ... Convex part, 32 ... Inverted shape of concavity and convexity pattern, 34 ... Strip-shaped step part, 38 ... Stripping roller, 40 ... Convex / concave sheet, 42 ... Winding device, 42A ... Winding Shaft, P ... Nip point
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Abstract
Description
帯状基材24は、できるだけ平滑な表面を有すると共に、ラミネートされる樹脂シート20の剛性よりも大きいことが好ましい。また、製造される凹凸シート40が光学素子として使用される場合には、透明な帯状基材24を用いることが好ましい。さらに、溶融押出しされた樹脂シート20の熱に耐える必要があり、比較的耐熱性の高いポリカーボネート樹脂、ポリスルホン樹脂、二軸延伸ポリエチレンテレフタレート樹脂等を挙げることができる。特に、平滑性が良好な点から、二軸延伸のポリエチレンテレフタレート樹脂が好ましい。帯状基材24は100μm~300μmの厚さを有するのが好ましく、160μm~210μmの厚さを有するのがより好ましい。
樹脂シート20を形成する樹脂としては、例えば、ポリメチルメタクリレート樹脂(PMMA)、ポリカーボネート樹脂、ポリスチレン樹脂、メタクリレート-スチレン共重合樹脂(MS樹脂)、アクリロニトリル-スチレン共重合樹脂(AS樹脂)、ポリプロピレン樹脂、ポリエチレン樹脂、ポリエチレンテレフタレート樹脂、グリコール変性ポリエチレンテレフタレート樹脂、ポリ塩化ビニル樹脂(PVC)、熱可塑性エラストマー、又はこれらの共重合体、シクロオレフィンポリマー等が挙げられる。溶融押出しやすさを考慮すると、例えば、ポリメチルメタクリレート樹脂(PMMA)、ポリカーボネート樹脂、ポリスチレン樹脂、メタクリレート-スチレン共重合樹脂(MS樹脂)、ポリエチレン樹脂、ポリエチレンテレフタレート樹脂、グリコール変性ポリエチレンテレフタレート樹脂のような溶融粘度の低い樹脂を用いるのが好ましく、転写し易さやシートの割れにくさ、凹凸パターン30の耐久性などを考慮するとグリコール変性ポリエチレンテレフタレート樹脂(PETG等)を用いるのがより好ましい。
接着性樹脂層21は、帯状基材24と樹脂シート20とを接着するための機能を備える。接着性樹脂層21としては、さらに、クッション機能を備えることが好ましい。ここで、クッション機能とは、凹凸シート40の巻取り時に、巻取テンションによる巻圧が凹凸パターン30の凸部30Aに加わったときに、巻圧を吸収する機能を有することを言う。このような、接着性とクッション性とを兼ね備えた接着性樹脂層21としては、変性ポリオレフィン系樹脂、ポリエステル系熱可塑性エラストマー等が挙げられる。接着性樹脂層21は、10μm~66μmの厚さを有するのが好ましく、5μm~10μmの厚さを有するのがより好ましい。
押出ダイ18は、樹脂シート20の押出温度を調整できる機能を有することが好ましい。即ち、押出ダイ18から押し出される樹脂シート20の押出温度は調整され、ニップ部Pでの樹脂シート20の温度がガラス転移温度以上となっているように設定される。ニップした樹脂シート20に型ローラ26からの転写が完了する前に冷却固化しないようにするためである。また、樹脂の熱分解が生じると、製造された凹凸シート40の面状悪化などの問題を生じることから、押出ダイ18から押し出す押出温度は転写が可能な限りで低く設定することが好ましい。樹脂の材料にグリコール変性ポリエチレンテレフタレート樹脂を採用した場合、押出ダイ18からの吐出温度は240~300℃、好ましくは250~290℃とすることができる。
型ローラ26の材質としては、各種鉄鋼部材、ステンレス鋼、銅、亜鉛、真鍮、これらの金属材料を芯金として硬質クロムメッキ(HCrメッキ)、Cuメッキ、Niメッキ等のメッキを施したもの、セラミックス、及び各種の複合材料が採用できる。
直径φ500mm、面長1000mmであり、図3の(A)部分に示す凹凸パターン30の型ローラ26を使用した。即ち、型ロール26の表面に、凸部30Aの曲率半径(R)が150μm、凸部高さ(H)が70μm、凸部30A同士のスパン(S)が254μmのレンチキュラーレンズ型の凹凸パターン30反転形状をバイト加工により形成した。
押出ラミネート幅を700mmとすることにより、はみ出し部20Aを形成せず、したがって折り曲げ加工もしなかった。その他の条件は実施例と同様である。
その結果、はみ出し部20Aを形成して製造した実施例の凹凸シート40は、巻取装置42に巻き取った巻取ロールにおいて、凹凸パターン30であるレンチキュラーレンズの潰れはなく、設計通りの凸部30A高さを維持していた。
Claims (9)
- 帯状のシートの表面に凹凸パターンが形成され、ロール状に巻き取られる凹凸シートにおいて、
前記シート幅方向の両端部に、前記シートの長手方向に沿ってシート厚みが他の部分よりも厚い帯状段差部が形成されて成る凹凸シート。 - 前記凹凸シートは、前記凹凸パターンが形成された樹脂シートに帯状基材がラミネートされた構造であると共に、前記帯状基材よりも幅広く形成された前記樹脂シートの両端部を前記帯状基材の裏面に折り曲げて接着することにより前記帯状段差部が形成される請求項1に記載の凹凸シート。
- 前記帯状段差部には前記凹凸パターンの幅方向両端部の凸部が含まれると共に、前記帯状段差部同士の間の凹凸パターンを製品部分とする請求項2に記載の凹凸シート。
- 前記凹凸シートは、前記凹凸パターンが形成された樹脂シートに帯状基材がラミネートされた構造であると共に、前記帯状基材よりも幅広く形成された前記樹脂シートの両端部を該樹脂シートに形成された凹凸パターンの幅方向両端部の凸部にオーバーラップするように折り曲げて接着することにより前記帯状段差部が形成される請求項1に記載の凹凸シート。
- 前記凹凸パターンは光学的性能を有する請求項1~4の何れか1に記載の凹凸シート。
- シート面に凹凸パターンが形成された凹凸シートの製造方法において、
送出装置から帯状基材を型ローラとニップローラとのニップ点に供給する帯状基材供給工程と、
熱可塑性の溶融樹脂を押出ダイからシート状に押し出して前記帯状基材よりも広幅な帯状の樹脂シートを形成し、形成した樹脂シートを前記型ローラと前記帯状基材との間になるように前記ニップ点に供給する樹脂シート供給工程と、
前記ニップ点に供給された樹脂シートと帯状基材を前記型ローラとニップローラとでニップすることにより、前記樹脂シートを前記帯状基材にラミネートすると共に、前記型ローラに形成された前記凹凸パターンの反転形状を前記樹脂シートに転写してから樹脂シートを冷却固化する転写工程と、
前記転写工程後に前記樹脂シートがラミネートされた帯状基材を前記型ローラから剥離する剥離工程と、
剥離工程後に、前記幅広な樹脂シートの両端部を前記帯状基材の裏面に折り曲げる折り曲げ工程と、
前記折り曲げた部分を前記帯状基材に接着する接着工程と、
前記接着工程後に前記樹脂シートがラミネートされた帯状基材をロール状に巻き取る巻取工程と、を備えた凹凸シートの製造方法。 - 前記押出ダイから押し出された前記樹脂シートの裏面側に接着性樹脂層が形成されるように、前記押出ダイから前記樹脂シートと前記接着性樹脂層とを共押出する請求項6の凹凸シートの製造方法。
- シート面に凹凸パターンが形成された凹凸シートの製造方法において、
送出装置から帯状基材を型ローラとニップローラとのニップ点に供給する帯状基材供給工程と、
熱可塑性の溶融樹脂を押出ダイからシート状に押し出して前記帯状基材よりも広幅な帯状の樹脂シートを形成し、形成した樹脂シートを前記型ローラと前記帯状基材との間になるように前記ニップ点に供給する樹脂シート供給工程と、
前記ニップ点に供給された樹脂シートと帯状基材を前記型ローラとニップローラとでニップすることにより、前記樹脂シートを前記帯状基材にラミネートすると共に、前記型ローラに形成された前記凹凸パターンの反転形状を前記樹脂シートに転写してから樹脂シートを冷却固化する転写工程と、
前記転写工程後に前記樹脂シートがラミネートされた帯状基材を前記型ローラから剥離する剥離工程と、
前記剥離工程後に前記幅広な樹脂シートの両端部を前記樹脂シートの凹凸パターンの一部分にオーバーラップするように折り曲げる折り曲げ工程と、
前記折り曲げた部分を前記樹脂シートのオーバーラップ部分に接着する接着工程と、
前記接着工程後に前記樹脂シートがラミネートされた帯状基材をロール状に巻き取る巻取工程と、を備えた凹凸シートの製造方法。 - 前記帯状基材の剛性は前記樹脂シートの剛性よりも大きい請求項6~8の何れか1に記載の凹凸シートの製造方法。
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JP2010125652A (ja) * | 2008-11-26 | 2010-06-10 | Fujifilm Corp | フィルム、その製造方法、偏光板および液晶表示装置 |
JP2010145790A (ja) * | 2008-12-19 | 2010-07-01 | Konica Minolta Opto Inc | 液晶表示装置 |
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US20130065009A1 (en) | 2013-03-14 |
JP2012201020A (ja) | 2012-10-22 |
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