JP6094282B2 - Junction apparatus for optical laminated film production, optical laminated film production apparatus, vane member, and method for producing optical laminated film - Google Patents

Description

  The present invention relates to an optical laminated film manufacturing apparatus, a merging apparatus used in the manufacturing apparatus, and a vane member used in the merging apparatus.

  As an optical film used to improve optical properties such as brightness, viewing angle, and contrast in display devices such as liquid crystal displays, an optical laminate in which a plurality of films are laminated with the recent advancement of functions required. Films are increasingly being used. Such an optical laminated film is manufactured using, for example, a co-extrusion method using a T die.

  As a co-extrusion method using a T-die, a multi-manifold system is known in which the resins supplied from a plurality of extruders are joined just before the lip portion of the T-die. In this system, each layer is widened in the width direction. Then, since the layers are joined and laminated, there is an advantage that the layer thickness of each layer can be made uniform in the width direction, but there is a disadvantage that the configuration of the T die is complicated and the cost is high.

  In contrast, a feed block (merging device) is provided immediately before the T die, and molten resin from a plurality of extruders is merged in the feed block, then supplied to the T die, and widened by a single manifold in the T die. The single manifold system (feed block system) has the advantage that the structure of the T-die can be simplified and the cost is low, but it is difficult to make the thickness of each layer uniform.

  In the single manifold system (feed block system), as a technique for improving the uniformity of the layer thickness of each layer, Patent Document 1 discloses a protrusion protruding in the thickness direction at an intermediate portion in the width direction of the resin flow path in the feed block. Is provided to make the flowability of the resin different in the width direction. According to Patent Document 1, by providing such a protrusion in the resin flow path, the ease of resin flow can be changed depending on the position in the width direction, and the flow distribution in the width direction before joining can be adjusted.

JP 2008-272989 A

  However, in the technique described in Patent Document 1, when the flow of the molten resin as a viscous fluid collides with a protrusion as an obstacle, a vortex or a vortex line (Kalman vortex line) is formed behind the protrusion, and downstream thereof. The flow on the side may change regularly or irregularly, especially in laminated films for optical applications where the required uniformity accuracy for the thickness of each layer is extremely high. May not be possible. In some cases, the resin stays behind the protrusions and gels, which may cause fish eyes and the like, and may cause problems such as deterioration of optical characteristics or reduction of productivity.

  The present invention has been made in view of these points, and achieves a high production of an optical laminated film excellent in optical characteristics by realizing both a reduction in cost and an improvement in the uniformity of the layer thickness of each layer. It aims at making it possible to manufacture with the property.

  In the optical laminated film manufacturing confluence apparatus according to the first aspect of the present invention, the first molten resin is circulated and flows out from a substantially rectangular first outlet having a longitudinal direction in the first direction. A substantially rectangular shape having a longitudinal direction in the first direction so that the resin flow path and the second molten resin are circulated and merged and laminated with the first molten resin flowing out from the first outlet The second resin flow channel that flows out from the second outlet of the first resin flow channel, the first resin flow channel, and the second resin flow channel are arranged at a joining portion of the first resin flow channel and the first resin flow channel. V including a first side surface constituting a part of the first resin channel near the first outlet and a second side surface constituting a part of the second resin channel near the second outlet A ridge portion that includes a vane member having a character portion, and intersects the first side surface and the second side surface of the vane member. , Concave with respect to substantially a line parallel to said first direction so as to project, characterized in that has a curved shape or a polygonal line shape.

  In the merging apparatus for producing an optical laminated film according to the first aspect of the present invention, the vane member is integrally formed with the V-shaped portion, and rotates about an axis substantially parallel to the first direction. A shape having a shaft portion that is pivotally supported is used, and the shapes of the first outlet and the second outlet can be changed by changing the position of the ridge line portion as the shaft portion rotates.

  In the merging apparatus for producing an optical laminated film according to the first aspect of the present invention, the shape of the ridge line portion is formed in a substantially V shape so as to be concave toward the central portion, or goes to the central portion. Accordingly, it can be formed in a substantially arc shape so as to be concave.

  In the merging device for producing an optical laminated film according to the first aspect of the present invention, at least one of the first side surface and the second side surface may be a curved surface or a slope so as to follow the shape of the ridge line portion. it can.

  In the merging apparatus for producing an optical laminated film according to the first aspect of the present invention, the laminated resin that is connected to the first outlet and the second outlet and flows out of these and laminated is circulated, and It is possible to use a discharge flow path that supplies a T-die arranged downstream, and the discharge flow path gradually changes from a substantially rectangular shape to a substantially circular shape.

  The optical laminated film manufacturing apparatus according to the second aspect of the present invention includes the optical laminated film manufacturing merging apparatus according to the first aspect of the present invention described above, and the first molten resin in the first resin flow path. A first resin supply system for supplying a resin; a second resin supply system for supplying the second molten resin to the second resin flow path; and a T-die connected to an outlet of the discharge flow path. It is characterized by providing.

  In the optical laminated film manufacturing apparatus according to the second aspect of the present invention, the first molten resin supplied by the first resin supply system may contain an ultraviolet absorber.

  The vane member according to a third aspect of the present invention includes a shaft portion having a longitudinal direction in a first direction, a first side surface and a second side surface arranged in a substantially V shape, and the V A ridge line portion where the first side surface and the second side surface of the character portion intersect with each other is arranged so as to be substantially along the first direction, and includes a V-shaped portion formed integrally with the shaft portion. The ridge line portion has a curved shape or a polygonal line shape so as to be concave or convex with respect to a line substantially parallel to the first direction.

  In the vane member according to the third aspect of the present invention, the ridge line portion is formed in a substantially V shape so as to be concave toward the central portion, or is approximately concave so as to go toward the central portion. It can be formed in an arc shape.

  In the vane member according to the third aspect of the present invention, at least one of the first side surface and the second side surface may be a curved surface or an inclined surface along the shape of the ridge line portion.

  According to the invention relating to the first aspect of the present invention, the first side face and the first side face arranged at the junction of the first resin flow path and the second resin flow path, and arranged in a substantially V shape with respect to each other. The ridge line portion where the first side surface and the second side surface of the vane member having the V-shaped portion including the two side surfaces intersect with each other has a curved shape or a polygonal line shape so as to be concave or convex. Since the shape of one or both of the second outlet and the second outlet is defined by such a curved or polygonal ridge line portion, the width of the resin flow at the merging portion can be adjusted by adjusting and optimizing the shape of the ridge line portion. The flow distribution in the direction can be adjusted with high accuracy. At this time, the resin flow is less likely to be disturbed by vortices, etc., as compared to the conventional technique in which the protrusions are provided in the flow path, so the uniformity of the layer thickness of each layer is highly accurate. Since it can be realized and gelation is less likely to occur, the productivity of the optical laminated film can be improved.

  According to the invention according to the second aspect of the present invention, since the merging device according to the first aspect of the present invention is provided, a high-quality optical laminated film having excellent optical characteristics is manufactured with high productivity. be able to.

  According to the invention according to the third aspect of the present invention, a vane member suitable for use in the junction device according to the first aspect of the present invention is provided.

It is a figure which shows the whole structure of the manufacturing system of the optical laminated | multilayer film of embodiment of this invention. It is the longitudinal cross-sectional view seen from the side which shows schematic structure of the feed block of embodiment of this invention. It is the longitudinal cross-sectional view seen from the front which shows schematic structure of the feed block of embodiment of this invention. It is a top view which shows schematic structure of the feed block of embodiment of this invention. It is the cross-sectional view seen from the bottom which shows schematic structure of the feed block of embodiment of this invention. It is a top view which shows one vane which made the ridgeline part of embodiment of this invention the circular arc shape. It is a front view which shows one vane which made the ridgeline part of embodiment of this invention circular arc shape. It is a figure which shows one vane which made the ridgeline part of embodiment of this invention circular arc shape, (a) is a side view, (b) is sectional drawing along the A1-A1 line or A3-A3 line of FIG. (C) is sectional drawing along the A2-A2 line of FIG. It is a top view which shows the other vane which made the ridgeline part of embodiment of this invention arc shape. It is a front view which shows the other vane which made the ridgeline part of embodiment of this invention arc shape. It is a figure which shows the other vane which made the ridgeline part of embodiment of this invention arc shape, (a) is a side view, (b) is sectional drawing along the A1-A1 line or A3-A3 line of FIG. (C) is sectional drawing along the A2-A2 line of FIG. It is a top view which shows one vane which made the ridgeline part of embodiment of this invention V shape. It is a front view which shows one vane which made the ridgeline part of embodiment of this invention V shape. It is a figure which shows one vane which made the ridgeline part of embodiment of this invention V shape, (a) is a side view, (b) is the cross section along the A1-A1 line or A3-A3 line of FIG. FIG. 14C is a cross-sectional view taken along line A2-A2 of FIG. It is a top view which shows the other vane which made the ridgeline part of embodiment of this invention V shape. It is a front view which shows the other vane which made the ridgeline part of embodiment of this invention V shape. It is a figure which shows the other vane which made the ridgeline part of embodiment of this invention V shape, (a) is a side view, (b) is the cross section along the A1-A1 line or A3-A3 line of FIG. FIG. 14C is a cross-sectional view taken along line A2-A2 of FIG. Using the manufacturing system of the embodiment of the present invention, the thickness (thickness) of each intermediate layer when an optical laminated film is manufactured using an arc-shaped vane, a V-shaped vane, and a flat-shaped vane is measured. It is a figure which shows the result.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(1) Optical laminated film manufacturing system First, the overall configuration of the optical laminated film manufacturing system will be described with reference to FIG. In this embodiment, a surface layer made of a second resin material having a component part or all different from that of the first resin material is laminated on both surfaces of the intermediate layer made of the first resin material. The production of the three-layer optical laminated film will be described as an example. However, this invention is not limited to what manufactures such an optical laminated film of 3 layers, It can apply also to manufacture of an optical laminated film of 2 layers or 4 layers or more. Moreover, the surface layer laminated | stacked on both surfaces of an intermediate | middle layer is not restricted to what uses the same resin material, You may use the resin material from which a part or all of a component differs.

  The optical laminated film manufacturing system 1 includes a first molten resin supply system 2 and a second molten resin supply system 3. These molten resin supply systems 2 and 3 heat hoppers 2a and 3a to which resin materials (pellets) made of dried amorphous thermoplastic resin are supplied, and the resin materials supplied to the hoppers 2a and 3a, respectively. In addition, there are provided extruders 2b and 3b for melting and kneading, gear pumps 2c and 3c for quantitatively supplying the resin melted by the extruders 2b and 3b, and filtering devices 2d and 3d for removing unmelted foreign matters. The molten resin from the filtering devices 2d and 3d is supplied to a feed block 4 as a merging device via pipes 2e and 3e. Details of the feed block 4 will be described later.

  The die 5 provided on the downstream side of the Ford block 4 is a single-layer T-die. As the die 5, it is preferable that the lip portion is made of a hard material such as tungsten carbide, and is subjected to chrome plating or the like to finish it smoothly to prevent the die line from being generated in the optical laminated film. There is no restriction | limiting in particular in the shape of the die | dye 5, A straight manifold type, a fish tail type, a coat hanger type etc. can be illustrated. Among these, a coat hanger type die can be suitably used because an optical film with little film thickness unevenness can be formed.

  The molten resin material extruded from the die 5 in the form of a film is sequentially cooled by the first cooling roll 6a, the second cooling roll 6b, and the third cooling roll 6c. An electrostatic pinning device (not shown) is provided in the vicinity of the opening of the die 5 so that static electricity is applied to both ends of the film and both ends of the film are electrostatically attracted to the first cooling roll 6a. ing.

  The take-up speeds of the first cooling roll 6a, the second cooling roll 6b, and the third cooling roll 6c are appropriately selected according to the heat shrinkage of the optical laminated film to be formed in order to obtain a uniform film thickness. The optical film cooled by the first cooling roll 6a, the second cooling roll 6b, and the third cooling roll 6c passes through a plurality of tension rolls 7a, 7b, 7c, drive rolls 8a, 8b, etc., and has a width as required. Both ends in the direction are cut (trimmed), and then wound on a winding roll 9. In addition, the thickness of the optical film manufactured is about 10-500 micrometers.

  Thereby, a long optical film is manufactured. In addition, a long thing means what has a length of at least about 5 times or more with respect to the width direction of a film, Preferably it has a length of 10 times or more, and specifically in roll shape. It has a length enough to be wound and stored or transported.

  A film roll wound with an optical laminated film is processed by a stretching apparatus that monoaxially stretches, biaxially or obliquely stretches the optical laminated film, a laminating apparatus that laminates with another optical film, and other processing apparatuses. And processed into an optical component used in a display device such as a liquid crystal display device, for example, a polarizing plate protective film, a retardation film, a brightness enhancement film, a transparent conductive film and the like.

  A foreign matter detection device (defect inspection device) 10 that detects (counts) the number of foreign matters remaining in the formed optical film is provided between the tension roll 7c and the drive rolls 8a and 8b. Is provided. In addition, you may provide an extending | stretching apparatus etc. between the drive rolls 8a and 8b and the winding roll 9, and in this case, the foreign material detection apparatus 10 may be provided in the downstream of this extending | stretching apparatus. That is, the winding roll 10 may be an optical film that is uniaxially stretched, biaxially stretched, or obliquely stretched.

(2) Feed block (merging device)
Next, the feed block 4 will be described in detail with reference to the drawings.

  2-5 is a figure which shows the structure of the feed block 4 which concerns on embodiment of this invention, FIG. 2 is the longitudinal cross-sectional view seen from the side, FIG. 3 is the longitudinal cross-sectional view seen from the front, FIG. FIG. 5 and FIG. 5 are cross-sectional views seen from the bottom.

  The feed block 4 includes a first resin flow path 11 and a second resin flow path 12 inside the block. The 1st resin flow path 11 has the pipe line 11a and the wide part 11b. One end of the pipe line 11a is opened from the upper surface of the block to the outside, and the pipe 2e of the first resin supply system 2 is connected to the opening via a flange (not shown), and the first passage 11a is connected to the first line 11a via the opening. A molten resin (first molten resin) is supplied from the resin supply system 2. The other end of the pipe line 11a is connected so as to open at a substantially central portion of the substantially rectangular widened portion 11b having a longitudinal direction in the X direction (first direction). Similarly, the outlet (first outlet) 11c on the downstream side of the widened portion 11b has a substantially rectangular shape having a longitudinal direction in the X direction.

  The 2nd resin flow path 12 has pipe line 12a, 12b and the wide part 12c, and the pipe line 13b and the wide part 13c. One end of the pipe line 12a is opened from the side surface of the block to the outside, and a pipe 3e of the second resin supply system 3 is connected to the opening via a flange (not shown), and the second line 12a is connected to the second line 12a via the opening. A molten resin (second molten resin) is supplied from the resin supply system 3. One end of a branch pipe 12b and a branch pipe 13b is connected to the pipe 12a. The other end of the branch pipe 12b is connected so as to open at a substantially central portion of a substantially rectangular widened portion 12c having a longitudinal direction in the X direction. Similarly, an outlet (second outlet) 12f on the downstream side of the widened portion 12c has a substantially rectangular shape having a longitudinal direction in the X direction. The other end of the branch pipe 13b is connected so as to open at a substantially central portion of the substantially rectangular widened portion 13c having a longitudinal direction in the X direction. Similarly, an outlet (second outlet) 13f on the downstream side of the widened portion 13c has a substantially rectangular shape having a longitudinal direction in the X direction.

  A vane (vane member) 14 is disposed in a portion between the widened portion 11b and the widened portion 12c (a portion in the vicinity of the upstream side of the joining portion of the first resin flow path 11 and the second resin flow path 12). . 6, 7, and 8 </ b> A to 8 </ b> C are diagrams illustrating the detailed configuration of the vane 14. The vane 14 includes a shaft portion 14a that is pivotally supported about an axis (center axis) B substantially parallel to the X direction, and a V-shaped portion 14b that is integrally formed so as to protrude from the shaft portion 14a. have. At one end of the shaft portion 14a, a hexagonal portion 14f for rotating around the central axis B in order to adjust the posture of the vane 14 is integrally formed on the same axis. The V-shaped portion 14b has a first side surface 14c and a second side surface 14d that are arranged in a substantially V shape.

  The first side surface 14c is disposed so as to constitute a part of the side wall of the widened portion 11b (a part near the first outlet 11c), and the second side surface 14d is a part of the side wall of the widened portion 12c (the second side). In the vicinity of the outlet 12f). The ridge line portion 14e where the first side surface 14c and the second side surface 14d intersect is a curved shape so as to be concave or convex with respect to a line substantially parallel to the X direction (see the imaginary line C in FIG. 6). It has become. In the present embodiment, as an example, the ridge line portion 14e has a substantially arc shape so as to be concave from the both sides toward the center portion. However, the curve shape forming the ridge line portion 14e is not limited to such a substantially arc shape, and may be a more complicated curve shape.

  In this embodiment, the 1st side surface 14c which comprises a part of side wall of the wide part 11b is a plane, and the 2nd side surface 14d which comprises a part of side wall of the wide part 12c is the shape of the ridgeline part 14e. It is a curved surface (concave curved surface) so as to follow smoothly. That is, the ridge line portion 14e has a sharp shape (substantially the same width microscopically) from one end side to the other end side.

  Here, the first side surface 14c, which is one side surface of the V-shaped portion 14b, is a flat surface, and the second side surface 14d, which is the other side surface, is a concave curved surface. May be a flat surface, and the first side surface 14c may be a concave curved surface. Further, both the first side surface 14c and the second side surface 14d may be concave surfaces having substantially the same shape so as to be symmetrical with each other. Furthermore, in the present embodiment, the ridge line portion 14e has a curved shape (substantially arc shape) so as to be concave as it goes from both sides to the center portion, and thus the first side surface 14c and the second side surface 14d Although at least one of them is a concave curved surface so as to smoothly follow the shape of the ridge line portion 14e, the ridge line portion 14e can also be a curved shape (substantially arc shape) so as to become convex from the both sides to the central portion. In this case, at least one of the first side surface 14c and the second side surface 14d is a convex curved surface so as to smoothly follow the shape of the ridge line portion 14e. Further, the ridge line portion 14e may be curved so that a part thereof is concave and the other part is convex. In this case, at least one of the first side surface 14c and the second side surface 14d is formed as a ridge line portion. A concave curved surface and a convex curved surface are formed so as to smoothly follow the shape of 14e.

  A vane (vane member) 15 is disposed in a portion between the widened portion 11b and the widened portion 13c (a portion in the vicinity of the upstream side of the joining portion of the first resin flow path 11 and the second resin flow path 12). . FIGS. 9, 10, and 11 (a) to 11 (c) are diagrams showing the detailed configuration of the vane 15. The vane 15 has a shape that is substantially symmetrical to the vane 14 and protrudes from the shaft portion 15a that is pivotally supported about an axis (center axis) B that is substantially parallel to the X direction and the shaft portion 15a. Thus, the V-shaped part 15b formed integrally is provided. At one end of the shaft portion 15a, a hexagonal portion 15f for rotating about the central axis B in order to adjust the posture of the vane 15 is integrally formed on the same axis. The V-shaped portion 15b has a first side surface 15c and a second side surface 15d that are arranged in a substantially V shape.

  The first side surface 15c is arranged to constitute a part of the side wall of the widened portion 11b (a part near the first outlet 11c), and the second side surface 15d is a part of the side wall of the widened portion 13c (second In the vicinity of the outlet 13f). The ridge line portion 15e where the first side surface 15c and the second side surface 15d intersect is curved so as to be concave or convex with respect to a line substantially parallel to the X direction (see virtual line C in FIG. 9). It has become. In the present embodiment, as an example, the ridge line portion 15e has a substantially arc shape so as to become concave as it goes from the both sides to the central portion, similarly to the vane 14. However, the curve shape forming the ridge line portion 14e is not limited to such a substantially arc shape, and may be a more complicated curve shape.

  In the present embodiment, the first side surface 15c constituting a part of the side wall of the widened portion 11b is a flat surface, and the second side surface 15d constituting a part of the side wall of the widened portion 13c is the shape of the ridge line portion 15e. It is a curved surface (concave curved surface) so as to follow smoothly. That is, the ridge portion 15e has a sharp shape (substantially the same width microscopically) from one end side to the other end side.

  Here, the first side surface 15c, which is one side surface of the V-shaped portion 15b, is a flat surface, and the second side surface 15d, which is the other side surface, is a concave curved surface. May be a flat surface, and the first side surface 15c may be a concave curved surface. Further, both the first side surface 15c and the second side surface 15d may be concave curved surfaces having substantially the same shape so as to be symmetrical to each other. Furthermore, in the present embodiment, the ridge line portion 15e has a curved shape (substantially arc shape) so as to become concave from the both sides toward the central portion, so that the first side surface 15c and the second side surface 15d At least one of them is a concave curved surface so as to smoothly follow the shape of the ridge line portion 15e, but the ridge line portion 15e can also be a curved shape (substantially arc shape) so as to become convex from the both sides to the central portion. In this case, at least one of the first side surface 15c and the second side surface 15d is a convex curved surface so as to smoothly follow the shape of the ridge line portion 15e. Further, the ridge line portion 15e may be curved so that a part thereof is concave and the other part is convex. In this case, at least one of the first side surface 15c and the second side surface 15d is formed as a ridge line portion. A concave curved surface and a convex curved surface are formed so as to smoothly follow the shape of 15e.

  As best shown in FIG. 2, the vanes 14 and 15 rotate around a central axis B within a predetermined angle range as indicated by arcuate arrows D1 and D2 in the figure. It is supported so that it can be positioned and fixed at an arbitrary position within the predetermined angle range. Therefore, by rotating the vanes 14 and 15 symmetrically or asymmetrically, the exit of the widened portion 11b (first outlet) 11c and the outlet of the widened portion 12c (second second) are caused by the change in position of the ridge portions 14e and 15e. The shape of the outlet 12f and the outlet (second outlet) 13f of the widened portion 13c can be changed.

  In this embodiment, in order to manufacture a three-layer optical laminated film in which the same surface layer (material, film thickness) is laminated on both surfaces of the intermediate layer, the shape of the V-shaped portion ( The ridge line portions 14e) are symmetrical with each other. However, depending on the profile of the optical laminated film to be manufactured, those having shapes that are not correlated with each other may be used.

  The outlet (first outlet) 11c of the first resin channel 11 (widened portion 11b), the outlet (second outlet) 12f of the second resin channel 12 (widened portion 12c), the second resin channel 12 (the widened portion 13c) of the outlet (third outlet) 13f is arranged at a joint portion having a generally rectangular shape as a whole, and a discharge pipe having a substantially rectangular cross-sectional shape downstream of the joint portion. One end of the path 16 is connected. The other end of the discharge pipe 16 opens to the bottom surface of the block, and this opening is connected to a resin receiving port (not shown) of the die 5. In the present embodiment, the shape of the resin inlet of the die 5 is assumed to be substantially circular, and the discharge pipe 16 is formed so as to gradually change from a rectangular shape to a circular shape on the downstream side of the substantially rectangular junction. Therefore, the opening has a substantially circular shape. The shape of the discharge pipe 16 is in accordance with the shape of the resin receiving port of the die 5, and when the resin receiving port of the die 5 is rectangular, the cross section is rectangular throughout. Can be used.

  Other types of vanes may be used. For example, in the feed block 4 described above, the following vanes 24 and 25 in which the ridge line portions 24e and 25e have a polygonal line shape may be used instead of the vanes 14 and 15 in which the ridge line portions 14e and 15e have a curved shape. . FIGS. 12, 13, and 14 (a) to 14 (c) are diagrams showing the detailed configuration of the vane 24. The vane 24 includes a shaft portion 24a that is pivotally supported about an axis (center axis) B substantially parallel to the X direction, and a V-shaped portion 24b that is integrally formed so as to protrude from the shaft portion 24a. have. At one end of the shaft portion 24a, a hexagonal portion 24f for rotating about the central axis B in order to adjust the posture of the vane 24 is formed integrally on a substantially coaxial line. The V-shaped portion 24b has a first side surface 24c and a second side surface 24d arranged in a substantially V shape.

  The first side surface 24c is arranged so as to constitute a part of the side wall of the widened portion 11b (a part near the first outlet 11c), and the second side surface 24d is a part of the side wall of the widened portion 12c (second In the vicinity of the outlet 12f). The ridge line portion 24e where the first side surface 24c and the second side surface 24d intersect is a polygonal line shape so as to be concave or convex with respect to a line substantially parallel to the X direction (see the imaginary line C in FIG. 12). It has become. In the present embodiment, as an example, the ridge line portion 24e is substantially V-shaped so as to be concave from the both sides toward the central portion. However, the polygonal line shape forming the ridge line portion 14e is not limited to such a substantially V shape, and may be a more complicated polygonal line shape.

  In this embodiment, the 1st side surface 24c which comprises a part of side wall of the wide part 11b is a plane, and the 2nd side surface 24d which comprises a part of side wall of the wide part 12c is the shape of the ridgeline part 24e. A concave slope (two slopes having valley lines) is formed along the line. That is, the ridge line portion 24e has a uniformly sharp shape (substantially the same width microscopically) from one end side toward the central portion and from the other end side toward the central portion.

  Here, the first side surface 24c, which is one side surface of the V-shaped portion 14b, is a flat surface, and the second side surface 24d, which is the other side surface, is a concave slope, but the second side surface 24d is opposite to this. May be a flat surface, and the first side surface 24c may be a concave slope. Further, both the first side surface 24c and the second side surface 24d may be concave slopes having substantially the same shape so as to be symmetrical to each other. Furthermore, in the present embodiment, the ridge line portion 24e has a polygonal line shape (substantially V-shaped) so as to be concave as it goes from both sides to the central portion, and thus the first side surface 24c and the second side surface 24d. Although at least one of them is a concave slope so as to follow the shape of the ridge line portion 24e, the ridge line portion 24e may be formed into a polygonal line shape (substantially inverted V shape) so as to become convex from the both sides to the central portion. In this case, at least one of the first side surface 24c and the second side surface 24d is a convex slope (two slopes having a ridge line) so as to follow the shape of the ridge line portion 24e. Further, the ridge line portion 24e may have a polygonal line shape so that a part thereof is concave and the other part is convex. In this case, at least one of the first side surface 24c and the second side surface 24d is formed as a ridge line portion. A concave slope and a convex slope are formed along the shape of 24e.

  FIGS. 15, 16, and 17 (a) to 17 (c) are diagrams illustrating the detailed configuration of the vane 25. The vane 25 has a shape that is substantially symmetrical to the vane 24, and protrudes from the shaft portion 25a that is pivotally supported about an axis (center axis) B that is substantially parallel to the X direction and the shaft portion 25a. The V-shaped portion 25b is integrally formed. At one end of the shaft portion 25a, a hexagonal portion 25f for rotating around the central axis B in order to adjust the posture of the vane 25 is integrally formed substantially coaxially. The V-shaped portion 25b has a first side surface 25c and a second side surface 25d that are arranged in a substantially V shape.

  The first side surface 25c is arranged to constitute a part of the side wall of the widened portion 11b (a part near the first outlet 11c), and the second side surface 25d is a part of the side wall of the widened portion 13c (second In the vicinity of the outlet 13f). The ridge line portion 25e where the first side surface 25c and the second side surface 25d intersect with each other is a polygonal line shape so as to be concave or convex with respect to a line substantially parallel to the X direction (see the virtual line C in FIG. 15). It has become. In the present embodiment, as an example, the ridge line portion 15e is substantially V-shaped so as to become concave from both sides toward the center portion, similarly to the vane 24. However, the polygonal line shape forming the ridge line portion 14e is not limited to such a substantially V shape, and may be a more complicated polygonal line shape.

  In the present embodiment, the first side surface 25c constituting a part of the side wall of the widened portion 11b is a flat surface, and the second side surface 25d constituting a part of the side wall of the widened portion 12c is the shape of the ridge line portion 25e. A concave slope (two slopes having valley lines) is formed along the line. That is, the ridge line portion 25e has a uniformly sharp shape (substantially the same width microscopically) from one end side toward the central portion and from the other end side toward the central portion.

  Here, the first side surface 25c, which is one side surface of the V-shaped portion 25b, is a flat surface, and the second side surface 25d, which is the other side surface, is a concave slope, but the second side surface 25d is opposite to this. May be a flat surface, and the first side surface 25c may be a concave slope. Further, both the first side surface 25c and the second side surface 25d may be concave slopes having substantially the same shape so as to be symmetrical with each other. Furthermore, in the present embodiment, the ridge line portion 25e has a polygonal line shape (substantially V-shaped) so as to be concave as it goes from both sides to the center portion, and thus the first side surface 25c and the second side surface 25d. Although at least one of them is a concave slope so as to conform to the shape of the ridge line portion 25e, the ridge line portion 25e may be formed into a polygonal line shape (substantially inverted V shape) so as to become convex from the both sides to the central portion. In this case, at least one of the first side surface 25c and the second side surface 25d is a convex slope (two slopes having a ridge line) so as to smoothly follow the shape of the ridge line portion 25e. Further, the ridge line portion 25e may have a polygonal line shape so that a part thereof is concave and the other part is convex. In this case, at least one of the first side surface 25c and the second side surface 25d is formed as a ridge line portion. A concave slope and a convex slope are formed along the shape of 25e.

(3) Resin material Examples of the amorphous thermoplastic resin used for forming the optical laminated film include, for example, methacrylic resin, polycarbonate, polystyrene, polymer resin having an alicyclic structure, cellulose resin, vinyl chloride resin, polysulfone. , Polyethersulfone and the like can be used. Among these, a polymer resin having an alicyclic structure can be suitably used. Since the polymer resin having an alicyclic structure has good fluidity, it can form a film with good thickness accuracy with small film thickness unevenness and extremely low hygroscopicity, so it has excellent dimensional stability. A film can be obtained.

  Examples of the polymer resin having an alicyclic structure include ring-opening polymers or ring-opening copolymers of norbornene monomers or hydrogenated products thereof, addition polymers or addition copolymers of norbornene monomers. Polymers or hydrogenated products thereof, polymers of monocyclic cyclic olefin monomers or hydrogenated products thereof, polymers of cyclic conjugated diene monomers or hydrogenated products thereof, vinyl alicyclic hydrocarbon based monomers A polymer or copolymer of a monomer or a hydrogenated product thereof, a polymer of a vinyl aromatic hydrocarbon monomer, or a hydrogenated product of an unsaturated bond part containing an aromatic ring of the copolymer. it can. Among these, norbornene-based polymer resins, which are hydrogenated products of norbornene-based monomer polymers, have good film-forming properties and excellent mechanical strength, heat resistance, and transparency. Can be used.

  As the ultraviolet absorber in the case of containing the ultraviolet absorber, known ones such as a benzophenone ultraviolet absorber, a benzotriazole ultraviolet absorber, and an acrylonitrile ultraviolet absorber can be used. Among them, as the ultraviolet absorber, 2,2′-methylenebis (4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol), 2- (2 '-Hydroxy-3'-tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2,4-di-tert-butyl-6- (5-chlorobenzotriazol-2-yl) phenol, 2 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, 2,2 ′, 4,4′-tetrahydroxybenzophenone and the like are preferably used. Among these, 2,2′-methylenebis (4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol) is particularly preferable.

  As a method of containing the ultraviolet absorber, a method of blending an ultraviolet absorber in a polymer resin having an alicyclic structure in advance; a method of using a masterbatch containing a high concentration of an ultraviolet absorber; A direct supply method and the like can be mentioned, and any method may be adopted.

(4) Manufacture of optical laminated film Using the optical laminated film manufacturing apparatus of the present embodiment, for example, a three-layer optical laminated film in which an intermediate layer contains an ultraviolet absorber and surface layers are laminated on both sides thereof is produced. In this case, the first resin supply system 1 uses the polymer resin having a cycloaliphatic structure containing the ultraviolet absorber as described above as the first molten resin as the first molten resin. The second resin of the Ford block 4 is supplied to the resin flow path 11 and the second resin supply system 2 uses the polymer resin having an alicyclic structure that does not contain such an ultraviolet absorber as the second molten resin. Supply to the channel 12.

  The first molten resin reaches the outlet 11c through the pipe line 11a and the widened part 11b, and the second molten resin reaches the outlet 12f through the pipe lines 12a, 12b and the widened part 12c, and the pipe lines 12a, 13b, and The dice 5 that reach the outlet 13f through the widened portion 13c, are stacked and merged at the merging portion constituted by these outlets 11c, 12f, and 13f, and are arranged downstream of the feed block 4 through the discharge pipe 16 It is supplied and extruded from the die 5 in the form of a film.

  The molten resin material extruded from the die 5 in the form of a film is sequentially cooled by the first cooling roll 6a, the second cooling roll 6b, and the third cooling roll 6c, and a plurality of tension rolls 7a, 7b, 7c, drive The two ends in the width direction are cut (trimmed) as necessary via the rolls 8a, 8b and the like, and then wound on the take-up roll 9.

  The layer thickness of the optical laminated film thus manufactured (film thickness of the intermediate layer) is measured, for example, by measuring the total thickness of the optical laminated film using a contact-type thickness meter and cutting the thickness measurement portion. This can be obtained by observing the cross section with an optical microscope, obtaining the thickness ratio between the intermediate layer and the surface layer, and calculating the thickness of the intermediate layer from the ratio.

  FIG. 18 illustrates the vanes 14 and 15 (FIGS. 6 to 11) in which the ridge portions 14e and 15e described in the above-described embodiment have an arc shape, and the vanes 24 and 25 in which the ridge portion has a substantially V shape (FIG. 12). To FIG. 17), and for comparison, the ridge line portion is formed in a straight line substantially parallel to the first direction (X direction), and three types of vanes (flat shape) having the first side surface and the second side surface as a plane are fed blocks. 4 shows a result of measuring the thickness (thickness) of an intermediate layer by manufacturing an optical laminated film and optimizing a vane posture (rotation angle) by trial and error. The profile of the optical laminated film in each production, the setting conditions in the production apparatus, and other conditions were all the same, and only the vane was exchanged to obtain the results.

  The variation in layer thickness (difference between the maximum and minimum values) when flat-shaped vanes are used is approximately 6 μm. When arc-shaped vanes are used, approximately 4 μm, and when V-shaped vanes are used, It is understood that an optical laminated film with little variation in layer thickness can be produced by adopting an arc-shaped or V-shaped vane.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the embodiment described above is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

1 ... Optical laminated film manufacturing system,
2 ... 1st resin supply system,
3 ... second resin supply system,
4 ... Feed block (merging device),
5 ... Dice (T Die)
11 ... 1st resin flow path,
12 ... Second resin flow path,
11a, 12a, 12b, 13b ... conduits,
11b, 12c, 13c ... widened portion,
11c, 12f, 13f ... exit,
12a, 12b ... pipelines,
14, 15, 24, 25 ... Bain,
14a, 15a, 24a, 25a ... shaft part,
14b, 15b, 24b, 25b ... V-shaped part,
14c, 15c, 24c, 25c ... 1st side surface,
14d, 15d, 24d, 25d ... the second side surface,
14e, 15e, 24e, 25e ... ridge line part.

Claims (14)

A first resin flow path for flowing the first molten resin and flowing out from a first outlet having a substantially rectangular shape having a longitudinal direction in the first direction;
A second outlet having a substantially rectangular shape having a longitudinal direction in the first direction so that the second molten resin is circulated and merged and laminated with the first molten resin flowing out from the first outlet. A second resin flow path flowing out from
A part of the first resin flow path in the vicinity of the first outlet is disposed at a junction between the first resin flow path and the second resin flow path and arranged in a substantially V shape. A V-shaped portion including a first side surface constituting the second side surface and a second side surface constituting part of the vicinity of the second outlet of the second resin flow path, and an axis substantially parallel to the first direction A vane member having a shaft portion ,
The ridge line portion where the first side surface and the second side surface of the vane member intersect is concave or convex toward the shaft portion with respect to a line substantially parallel to the first direction. Thus, the confluence apparatus for optical laminated film manufacture characterized by being curvilinear shape or a polygonal line shape. The vane member, the V-shaped portion and is integrally formed, pivotably has the shaft portion is pivotally supported about an approximately parallel said axis to said first direction,
The merging apparatus for producing an optical laminated film according to claim 1, wherein the shape of the first outlet and the second outlet is changed by a change in position of the ridge line portion accompanying rotation of the shaft portion.   The said ridgeline part is formed in the substantially V shape so that it may become concave as it goes to the center part, The merging apparatus for optical laminated film manufacture of Claim 1 or 2 characterized by the above-mentioned.   The said edge part is formed in the substantially circular arc shape so that it may become concave as it goes to the center part, The merging apparatus for optical laminated film manufacture of Claim 1 or 2 characterized by the above-mentioned.   At least one of said 1st side surface and said 2nd side surface is a curved surface or a slope so that the shape of the said ridgeline part may be followed, The Claim 1 characterized by the above-mentioned. Junction device for optical laminated film production. A discharge passage connected to the first outlet and the second outlet, and flowing through the laminated resin that has been flown out and merged and supplied to the T-die disposed downstream thereof;
6. The merging apparatus for producing an optical laminated film according to claim 1, wherein a cross section of the discharge channel gradually changes from a substantially rectangular shape to a substantially circular shape. A merging device for producing an optical laminated film according to any one of claims 1 to 6,
A first resin supply system for supplying the first molten resin to the first resin flow path;
A second resin supply system for supplying the second molten resin to the second resin flow path;
An optical lamination comprising: a T-die connected to the first outlet and the second outlet, and connected to an outlet of a discharge passage for flowing the laminated resin that has flowed out from the first outlet and joined and laminated. Film production equipment.   The apparatus for producing an optical laminated film according to claim 7, wherein the first molten resin supplied by the first resin supply system contains an ultraviolet absorber. A shank having a longitudinal direction in a first direction;
The first has a side and a second side, so ridgeline portion a front Symbol first side and the second side surface intersect along outline in the first direction which are arranged in a substantially V-shape to one another And a V-shaped part formed integrally with the shaft part,
The vane characterized in that the ridge line portion has a curved shape or a polygonal line shape so as to be concave or convex in the direction of the shaft portion with respect to a line substantially parallel to the first direction. Element.   10. The vane member according to claim 9, wherein the ridge portion is formed in a substantially V shape so as to be concave toward the central portion thereof.   10. The vane member according to claim 9, wherein the ridge portion is formed in a substantially arc shape so as to be concave toward a center portion thereof.   The at least one of said 1st side surface and said 2nd side surface is a curved surface or a slope so that the shape of the said ridgeline part may be followed, The Claim 9 characterized by the above-mentioned. Bain member. A merging device for producing an optical laminated film according to any one of claims 1 to 6,
A first resin supply system for supplying the first molten resin to the first resin flow path;
A second resin supply system for supplying the second molten resin to the second resin flow path;
An optical laminated film manufacturing apparatus comprising: a T-die connected to an outlet of a discharge channel that is connected to the first outlet and the second outlet, and flows through the laminated resin that has been flown out and joined together. And a method for producing an optical laminated film. The method for producing an optical laminated film according to claim 13, wherein the first molten resin supplied by the first resin supply system contains an ultraviolet absorber.

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