JP2000052399A - Manufacture of optical control element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture an optical control element by using an extrusion molding method by discharging molten resin for a sheet base material, forming a molten mixture obtained by mixing transparent thin pieces having different refractive index from that of a resin for resin stripes with the resin, forming a composite resin flow, and extrusion molding a sheet-like material of a molten state. SOLUTION: Resin (a) for a sheet base material is distributed into two channels 13, 14 in a die pack 6 by a first fixed displacement pump 3. Resin (b) for resin stripes is distributed to a plurality of channels in the pack 6 via channels 15 by a second metering pump 4. The resins (a), (b) are discharged from a resin discharge port 31 for the stripes to a confluent unit of the resin for the base material and the resin for the stripes to form a flow of a plurality of the resin stripes having a predetermined shape, size, array and the like. Meanwhile, the resin (a) is discharged from resin discharge ports 35, 36 for the base material to a confluent unit, sandwiched at the plurality of the stripes of the resin (b) between both the sides, deformed in a flat state, a composite resin flow is formed while the stripes are being embedded therein, and extruded from a composite resin outlet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a light control element, and more particularly, to a method for manufacturing a light control element using a light control resin material having a diffusibility for controlling the traveling direction and polarization of light.

[0002]

2. Description of the Related Art As a light control element, a large number of transparent flakes having a refractive index different from that of a transparent resin are arranged at a predetermined angle in a light guide having a flat surface made of a transparent resin having a predetermined refractive index. A decentralized version has been proposed. As a method and an apparatus for manufacturing the light control element, a molten mixture obtained by mixing a large number of transparent flakes having a different refractive index into a transparent resin having a predetermined refractive index is subjected to a plurality of partitions so as to form a plurality of rectangular or parallelograms. There is proposed a production method and an apparatus which have a step of extruding through a nozzle provided with the above, so that the orientation of the transparent flake is desired. (JP-A-7-333440)

[0003]

However, in the conventional method, the transparent flakes are caused to flow along the partition wall surface. It was difficult to arrange in morphology.

An object of the present invention is to provide a light control method in which a number of transparent flakes having a refractive index different from that of a resin for a sheet base are arranged in a desired form and dispersed in a resin sheet having a smooth surface made of a transparent resin. An object of the present invention is to provide a method for manufacturing an element by using an extrusion molding method and making it extremely simple.

[0005]

That is, the present invention provides a resin sheet in which a plurality of resin strips having a flat cross section are buried in parallel in a resin sheet, and a large number of transparent flakes are embedded in the resin strip. Are arranged and dispersed, having a predetermined width in the X direction, a predetermined thickness in the Y direction and a predetermined length in the Z direction, and a sheet base material at one end in the Z direction. (22) of the resin for resin and the resin for resin strip, and a composite resin flow path (21) having an outlet (23) of the composite resin flow at the other end are provided, and are arranged on the XY plane of the junction (22). A plurality of resin strip outlets (31) are arranged at predetermined intervals in the X direction, and are directed toward the junction from both sides of the XZ plane of the junction (22) and extend in the X direction. Discharge ports (35, 36) for the resin for the sheet base are arranged, and the discharge ports (35, 36)
Are portions having a large length in the Z direction in the XZ section (Ln,
Rn) and a device having a shape in which portions (Lm, Rm) having a small length are alternately arranged, and a molten mixture obtained by mixing transparent flakes having a different refractive index from the resin for the resin strip into a discharge port ( 31) and the molten resin for sheet base is discharged from the discharge ports (35, 36) to form a composite resin flow, and the molten sheet-like material is extruded from the composite resin flow outlet (23). A method for manufacturing a light control element, comprising the steps of:

Another aspect of the present invention is to provide a resin sheet in which a plurality of resin strips having a flat cross section are buried in parallel in a resin sheet, and a large number of transparent flakes are arranged in the resin strip. A method of manufacturing a light control element dispersed by
It has a predetermined width in the direction, a predetermined thickness in the Y direction, and a predetermined length in the Z direction, and at one end in the Z direction, a junction (22) of the resin for the sheet base material and the resin for the resin strip, and at the other end. A composite resin flow path (21) having a composite resin flow outlet (23) is provided, and a plurality of rows of slit-shaped discharge ports (41) of resin for a resin strip facing the XY plane of the junction (22). And a device in which a plurality of rows of slit-shaped discharge ports (42) of the resin for the sheet base material are alternately arranged in parallel with the Y direction at a predetermined angle other than 0 °. The molten mixture mixed with the transparent flakes having different refractive indices is discharged from the discharge port (41), and the molten resin for the sheet base is discharged from the discharge port (42) to form the composite resin flow. Exit (2
3. A method for manufacturing a light control element, comprising a step of extruding a molten sheet from 3).

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. In the present invention, the X direction coincides with the width direction of the obtained composite resin sheet, the Y direction coincides with its thickness direction, the Z direction coincides with the length direction (the direction in which the sheet is formed), and the angle between them is a right angle.

FIG. 1 is a sectional view showing an example of a composite sheet that can be produced by the production method of the present invention, and is a partial sectional view of an XY section perpendicular to the Z direction in the extrusion direction.

In FIG. 1A, a plurality of resin strips having a flat shape in the XY plane are embedded in a resin sheet, and a number of transparent flakes are arranged and dispersed in the resin strip. The resin strips are disposed parallel to each other at a predetermined angle θ other than 0 ° with respect to the sheet surface (X direction). Further, the transparent flakes are arranged and dispersed in the resin strip along the longitudinal direction of the resin strip as shown in the figure. FIG. 1 (b) shows a transparent strip that is arranged and dispersed in both the resin strip and the sheet substrate. FIGS. 1C and 1D show an example of a light control element in the case where the same resin is used for the sheet base and the resin strip so that no interface is formed between them. These light control elements can be manufactured by the manufacturing method of the present invention.

FIGS. 2 to 4 show one embodiment of an extrusion molding apparatus used in the present invention. FIGS. 2 and 3 are a schematic plan view and a side view of the entire apparatus, respectively. FIG. FIG. 3 is a plan sectional view showing an example of the internal structure of the die pack.

The production method of the present invention employs a co-extrusion method. The composite resin flow formed in the composite resin flow forming section is extruded from the composite resin outlet, and then, if desired, is formed by a group of forming rolls. Attaching and glazing are performed.

More specifically, the resin a for the sheet base is made of the first resin.
It is melt-extruded into the shaping head (5) by the extruder (1) and reaches the first metering pump (3) through the first flow path (11). The resin b for forming the resin strip is melt-extruded into the shaping head (5) by the second extruder (2) and reaches the second metering pump (4) through the second flow path (12). .
The resin “a” has two flow paths (13) in the die pack (6),
(14), and the resin b is distributed to a plurality of flow paths in the die pack (6) via the flow path (15), and the resin for the sheet base and the resin are discharged from the resin discharge port for the resin strip (31). It is discharged to the junction (22) with the strip resin, and forms a flow of a plurality of resin strips having a predetermined shape, dimensions, arrangement and the like.
On the other hand, resin a is a resin discharge port for sheet base material (35, 36).
The resin is discharged to the junction (22), and is deformed into a flat shape by sandwiching the plurality of resin strips of the resin b from both sides, forming a composite resin flow while embedding the resin strip therein, thereby forming a composite resin outlet. Extruded from (23). This composite resin stream is taken up by a group of forming rolls (10), shaped into a sheet, and then cut into a predetermined length by a sheet cutter (16).

FIG. 5 is a sectional view taken along line II of FIG. 4, and FIG. 6 is a perspective view taken along the line II-II of FIG.
7 is a sectional view taken along the line III-III in FIG. 5, and FIG. 8 is a sectional view taken along the line IV-IV in FIG. 7 (XZ section).
It is.

At one end of the composite resin flow path, a plurality of resin resin outlets (31) have a substantially circular cross section in the Z direction and are arranged at predetermined intervals in the X direction. Two discharge ports (3
5, 36) are arranged facing each other in the Y direction.

XZ of discharge port (36) of resin for sheet base
The shape in the cross section is a portion (R
n) and a portion (Rm) having a small length in the Z direction have a gear-like shape alternately arranged. The same applies to the discharge port (35) arranged on the opposite side with respect to the XZ plane. One set of Ln and Lm and one set of Rn and Rm are provided for every two discharge ports (31) of the resin for sheet base. The length of the portion (Lm, Rm) having a small length in the Z direction may be zero, and in that case, the discharge ports (35, 36) of the resin for each sheet base are each formed of a plurality of holes.

FIG. 9 is a schematic view showing the shape of a resin strip formed in the composite resin flow path (21), and shows the shape of the resin flow path for the sheet base at the junction (22) of the composite resin flow path. It is a combination of the shape and the shape of the resin strip B near the outlet (23).

A junction (22) in the composite resin flow path (21)
In, the resin for the resin strip discharged from the discharge port (31) is discharged from the discharge port (35, 36) due to the relative arrangement relationship between the discharge port (35, 36) and the discharge port (31). As a result of the shearing effect of the fluid generated by the flow of the sheet base resin, the shape in the XY cross section of FIG.
And is flattened as shown in FIG. The flux of the sheet base resin discharged from the discharge ports (35, 36) acts as if it were two parallel flat plates, and the resin for the resin strip filled therebetween undergoes shear deformation.

The transparent flake mixed in the resin for the resin strip is
It is affected by the shearing action of the resin for the resin strip. In other words, the orientation of the transparent flakes is performed by this, and the resin strips are arranged along the long axis direction of the flattened resin strips. When the resin for the sheet base and the resin for the resin strips are different, FIG. The light control element as shown is obtained.

When transparent flakes are mixed in the resin for the sheet base, the resin for the sheet base is not shown in FIGS.
, The transparent flakes contained therein are arranged in parallel to the major axis direction of the resin strip, and likewise shown in FIG. 1 (b). Such a light control element is obtained. In this case, the width (WL) in the X direction at the portion (Ln and Rn) where the length in the Z direction of the XZ cross section of the discharge port (35, 36) of the sheet base resin is large.
n and WRn) and the ratio (WLn / HLn and WRn / HRn) of the length in the Z direction (HLn and HRn) are preferably 以下 or less. This makes it easier for the transparent flakes mixed in the resin sheet to flow along the side wall surface in the height direction of the discharge ports (35, 36), and the degree of orientation of the transparent flakes is further uniformed. In addition, by setting the length in the Z direction to a finite appropriate value for the portion (Lm, Rm) having a small length in the Z direction, the shape of the resin strip can be made closer to a rectangle surrounded by a straight line. Becomes possible.

FIGS. 10 to 12 are views showing another structural example of the die pack. FIG. 10 is a sectional view taken along the line III-III in FIG. The difference is that one set of Ln and Lm or one set of Rn and Rm in the discharge port (35, 36) of the resin for sheet base is provided for one of the discharge ports (31). FIG.
1 is a sectional view (XZ section) taken along line VV in FIG. 10.

FIG. 12 is a view similar to FIG.
FIG. 1 is a schematic view showing a shape of a resin strip formed in 1).
It is a combination of the shape of the resin flow path for the sheet base at the resin confluence (22) of the composite resin flow path and the shape of the resin strip B near the outlet (23).

Also in this example, the transparent flakes are oriented while being subjected to the shearing deformation effect of the flow of the resin for the resin strip and the resin for the sheet base as in the previous case, and the light control element shown in FIG. Is obtained.

In order to effectively obtain the flow action of each molten resin in the method of the present invention, the relative positional relationship between the resin a discharge port (31) and the resin b discharge port (35, 36) In addition to the device factors such as the length (outflow width) of the discharge ports (35, 36) Ln and Rn in the X direction (outflow width) and the length in the Z direction (outflow height), the outflow speed ratio and the molten resin viscosity ratio of both resins By adjusting the conditions such as the above, it is possible to further obtain shear deformation, whereby the transparent flakes in the resin sheet and the resin strip can be effectively oriented and dispersed in a desired form.

Discharge port (35, 36) for sheet base resin
, The inclination angle φ with respect to the sheet width direction (X direction) can also be freely taken. The inclination angle φ does not coincide with the inclination angle θ of the resin strip, but has an influence on the inclination angle θ of the resin strip, and therefore, it is possible to adjust the orientation angle of the transparent flake.

FIG. 13 shows a composite resin outlet (23) fitted with a reducing die (24). By using this apparatus, the width, thickness, or width and thickness of the resin flow path can be reduced. When only the width is reduced, the pitch of the resin strip can be reduced and the degree of orientation of the transparent flakes can be made more uniform, which is more useful as a light control element.

FIG. 14 is a YZ sectional view of the forming roll portion. As shown in FIG. 14, after the composite resin flow is extruded from the composite resin outlet (23) as a molten sheet, at least one pair is formed. And between the at least one surface of the sheet-like material and the molding roll (10), a molten resin pool (38) is formed and molded into an extruded plate. The sheet glazed and glazed by the forming roll (10) in this way has a uniform thickness and has no streaks, irregularities, undulations, fine wrinkles, etc. on the surface, and is extremely suitable as a light control element.

Next, another manufacturing method of the present invention will be described. FIG. 15 is a cross-sectional view similar to FIG. 1, illustrating an example of a composite sheet manufactured by this method.
(D) is an XY sectional view perpendicular to the Z direction of the extrusion direction. When resins having different refractive indices are used for the resin strip and the sheet base material, the light control element shown in FIG. 15A or FIG. 15B is obtained.
The light control element shown in FIG. 5 (c) or (d) is obtained.

FIG. 16 is a sectional view showing the internal structure of the die pack, FIG. 17 is a sectional view taken along line VI-VI in FIG. 16, and FIG. 18 is a sectional view taken along line VII-VII in FIG.
FIG. 19 is an XY cross-sectional view of the extruded composite resin sheet.

In the case of this method, in order to uniformly arrange and disperse the plane side of the transparent flakes in the resin strip parallel to the major axis direction of the resin strip in the XY cross section, the resin strip resin discharge port ( 41) and the shape of the discharge port (42) of the resin for the sheet base material is a slit shape. Therefore, the ratio of the width Wj and the length Lj of the discharge port (41) in the Y direction (Wj /
Lj) and the ratio (W) of the width Wa and the length La of the discharge port (42).
a / La) is preferably 1/10 to 1/70.
By using such a slit-shaped thing, the transparent flakes are arranged in parallel in the major axis direction of the resin strip because the transparent flakes flow in a layered manner in the discharge path with the plane side thereof along the wall surface of the discharge path. be able to. If this ratio is less than 1/10, it is likely to be difficult to achieve uniform orientation. Also, 1 /
If it exceeds 70, the single axis W
Processing of dimensions j and Wa becomes difficult.

It is preferable that the length Lj of the long side of the discharge port (41) of the resin for resin strip is larger than the length La of the long side of the discharge port (42) of the resin for sheet base material. Thereby, when the transparent flake is added to the resin for the sheet base,
The transparent flakes can be arranged parallel to the long axis direction of the resin strip up to the sheet surface.

The inclination angle φ of the resin strip with respect to the surface of the resin sheet shown in FIG. 4 can be freely set, and therefore, the angle in the arrangement direction of the transparent flakes can be set to a predetermined value. Examples of the resin for a sheet substrate that can be used in the method of the present invention include various acrylic resins represented by polyethylene terephthalate, polyvinyl chloride, polystyrene, polycarbonate, and polymethyl methacrylate, amorphous polyolefin, polyamide, and polymethylpentene. , An allyl resin, a cellulose resin, a silicone resin, a copolymer resin of a monomer constituting these polymers, a blend resin, and the like. Transparency, like visibility control sheet, light diffusion plate, etc.
In the case where weather resistance and the like are particularly required, an acrylic resin is preferable, and polymethyl methacrylate is the most preferable material. Further, as the resin strip, various resins listed as the resin for the sheet base can be used, and are selected in consideration of the adhesion to the resin for the sheet base. The same resin as the resin sheet can be used, or a resin having a different refractive index from the resin sheet can be used.

The transparent flake may be the same or similar to a conventionally known basic lead carbonate single crystal. In addition to the basic lead carbonate single crystal, mica, inorganic glass, or a material obtained by coating these with a metal oxide can be used.

According to the method of the present invention, the transparent flakes are arranged and dispersed in a desired form up to the vicinity of the surface layer of the sheet. Therefore, unlike the conventional method, a step of removing the surface layer later is not required. But it is advantageous.

[0034]

The present invention will be described more specifically with reference to the following examples.

Example 1 Using a resin sheet manufacturing apparatus having the structure shown in FIGS. 2 to 6, 10, 11 and 14, polymethyl methacrylate (Acrypet MD, trade name, Mitsubishi Rayon) Co., Ltd.) and polycarbonate (Iupilon H-
3000, trade name, Mitsubishi Gas Chemical Co., Ltd.)
An approximately disk-shaped inorganic glass (transparent flake) having a thickness of about 5 μm and a thickness of about 0.1 μm, which is dispersed at 0.1% by weight, is supplied.
Extrusion molding at a shaping temperature of 250 ° C, 2 mm thickness x 30
A light control element having a width of 0 mm as shown in FIG. 1A was prepared. Here, the discharge port (31) of the resin for a resin strip had an inner diameter of 0.5 mm and was arranged with a pitch between adjacent discharge ports of 2 mm. In addition, a discharge port (35,
36) The lengths of Lm and Rm in the Z direction are each 0 mm, and the lengths of Ln and Rn are each 1 mm.
The lengths of Lm and Rm in the X direction are each 1 m
The lengths of m, Ln and Rn were each 1 mm. The width in the X direction at the junction of the composite resin flow path is 300 m.
The width in the m and Y directions was 2 mm.

When the cross section of the obtained composite resin sheet is observed with a microscope, the composite resin sheet has a thickness of about 0.4 m.
m, flat resin strips having a width of about 2 mm were formed parallel to each other at a pitch of 2 mm at an inclination of about 45 ° with respect to the sheet surface (X direction). The transparent flake is shown in FIG.
As shown in the figure, the resin was oriented and dispersed along the longitudinal direction of the resin strip.

Example 2 The same procedure as in Example 1 was repeated except that the same transparent flake as that used in Example 1 was used in the resin for the sheet base material, which was filled at 0.1% by weight, kneaded and dispersed. Light control elements were prepared in exactly the same manner as in Example 1.

When the cross section of the obtained composite resin sheet was observed with a microscope, transparent flakes were found in the sheet base resin as shown in FIG.
As shown in (b), they were oriented and dispersed along the longitudinal angle of the resin strip.

Example 3 A composite resin sheet was manufactured in exactly the same manner as in Example 2 except that the sheet manufacturing apparatus having the structure shown in FIGS. 2 to 8 and 14 was used. Here, the discharge port (31) of the resin for a resin strip had an inner diameter of 0.5 mm and was arranged with a pitch between adjacent discharge ports of 2 mm. Further, the lengths of Lm and Rm in the Z direction of the discharge ports (35, 36) of the resin for sheet base material are 0 mm and Ln, respectively.
And Rn have a length of 1 mm each, and the lengths of Lm and Rm in the X direction are 3 mm, Ln and Rn, respectively.
Were 1 mm each, and the outflow angle φ was 45 °.

When the cross section of the obtained composite resin sheet is observed with a microscope, the thickness of the composite resin sheet is about 0.4 m.
m, resin strips having a width of about 2 mm were formed in parallel with each other at a pitch of 2 mm with an inclination of about 45 ° with respect to the sheet surface (X direction). Further, as shown in FIG. 1 (b), the transparent flakes were oriented and dispersed along the longitudinal direction of the resin strip. Example 4 A light control element was prepared in the same manner as in Example 1 except that polymethyl methacrylate was used for both the resin for the sheet base material and the resin for the resin strip.

When the cross section of the obtained composite resin sheet was observed with a microscope, as shown in FIG. 1 (c), the transparent flakes were partially overlapped with the sheet surface by about 4% in the composite resin sheet.
The transparent flakes are arranged and dispersed at an angle of 5 degrees, and the dispersed portions (resin strips) of the transparent flakes have a thickness of about 0.4 mm and a width of about 2 mm.
And formed at a pitch of 2 mm.

Example 5 The same procedure as in Example 1 was carried out except that the same transparent flake as that used in Example 1 was also filled in the resin for the sheet base material at 0.1% by weight, kneaded and dispersed. Light control elements were prepared in exactly the same manner as in No. 4.

When the cross section of the obtained composite resin sheet was observed with a microscope, as shown in FIG. 1D, the transparent flakes were arranged at an angle of about 45 degrees with respect to the sheet surface over the entire composite resin sheet. Was dispersed.

[Embodiment 6] The reduced base (2) shown in FIG.
A light control element was prepared in the same manner as in Example 5, except that 4) was attached to the outlet of the composite resin channel. The reduction cap is X
Only the direction (width direction of the sheet) was reduced to １ ／.

When the XY cross section of the obtained composite resin sheet was observed with a microscope, as shown in FIG.
The transparent flakes were arranged at an angle of 5 degrees, and the distance between adjacent transparent flakes was small, and the alignment was performed uniformly.

Example 7 A composite resin sheet was manufactured in exactly the same manner as in Example 2 except that the sheet manufacturing apparatus having the structure shown in FIGS. 2, 3 and 16 to 18 was used. Here, in the XY cross section, the width Wj of the discharge port (41) for the resin strip is 0.1 mm, the length Lj is 1.8 mm, and the width JWa of the discharge port (42) for the sheet base resin is 0.1 mm. ,
The length La is 2 mm, the outflow angle φ is 45 °, and the discharge port (4
The pitch of 1) was 0.4 mm, and the pitch of the discharge port (42) was 0.4 mm. Also, X at the junction of the composite resin flow path
The width in the direction was 300 mm, and the width in the Y direction was 2 mm.

When the cross section of the obtained composite resin sheet is observed with a microscope, a resin strip having a thickness of about 0.1 mm in the X direction and a length of about 1.8 mm in the Y direction is included in the composite resin sheet.
Approx. 45 ° with respect to the sheet surface (X direction) at a pitch of 4 mm
And formed parallel to each other. The transparent flakes were oriented and dispersed along the long axis of the resin strip as shown in FIG. 15 (a).

Example 8 The same procedure as in Example 1 was carried out except that the same transparent flake as that used in Example 1 was also filled into the resin for the sheet base material in an amount of 0.1% by weight, kneaded and dispersed. A light control element was produced in exactly the same manner as in No. 7.

When the cross section of the obtained composite resin sheet was observed with a microscope, it was found that the transparent flakes were found in the sheet base resin as shown in FIG.
As shown in FIG. 5 (b), the resin strips were oriented and dispersed along the longitudinal angle.

Example 9 A light control element was prepared in the same manner as in Example 7 except that polymethyl methacrylate was used for both the resin for the sheet base material and the resin for the resin strip.

When the cross section of the obtained composite resin sheet is observed with a microscope, as shown in FIG. 15 (c), the transparent flake partially covers the sheet surface (X direction) in the composite resin sheet.
Are arranged and dispersed at an angle of about 45 ° with respect to the transparent flakes.
m, a length of about 1.8 mm, and a pitch of 0.4 mm were formed parallel to each other at an inclination of about 45 ° with respect to the sheet surface.

Example 10 The same procedure as in Example 1 was carried out except that the same transparent flake as that used in Example 1 was also filled into the resin for the sheet base material in an amount of 0.1% by weight, kneaded and dispersed. Light control elements were prepared in exactly the same manner as in No. 9.

When the cross section of the obtained composite resin sheet is observed with a microscope, as shown in FIG. 15D, the transparent flakes are uniformly arranged in the composite resin sheet at an angle of about 45 degrees with respect to the sheet surface. And was dispersed.

[Embodiment 11] A light control element was prepared in the same manner as in Embodiment 10 except that the reduction die (24) shown in FIG. 6 was used. The reduction die (24) is reduced in half only in the X direction (the width direction of the sheet).

When the cross section of the obtained composite resin sheet is observed with a microscope, as shown in FIG. 15D, the transparent flakes are adjacent to each other at an angle of about 45 degrees with respect to the sheet surface in the composite resin sheet. The distance between the transparent flakes was extremely small, and the alignment was performed uniformly.

[Reference Example 1] The discharge port (4
The width Wj of 1) is 0.5 mm, the length Lj is 2 mm, and the width Wa of the discharge port (42) is 0.4 mm and the length La is 1.8.
A light control element was prepared in the same manner as in Example 10 except that mm was used.

Observation of the XY cross section of the obtained sheet with a microscope revealed that the angle of the transparent flakes was not uniform and no orientation was obtained.

[0058]

According to the production method of the present invention, a light control element having a uniform sheet surface condition and thickness, transparent flakes arranged and dispersed at a desired angle, and sufficient uniformity can be obtained by an extremely simple method. Can be manufactured. In particular, by manufacturing the sheet so that the resin strip is provided, the orientation of the transparent flakes included in this portion is easily advanced, and a light control element having excellent optical characteristics can be manufactured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a light control element that can be manufactured by the method of the present invention.

FIG. 2 is a plan view of the entire apparatus used in the manufacturing method of the present invention.

FIG. 3 is a side view of the entire apparatus used in the manufacturing method of the present invention.

FIG. 4 is a sectional view showing an internal structure of a die pack of the apparatus shown in FIGS. 2 and 3.

FIG. 5 is a sectional view taken along line II of FIG. 4;

FIG. 6 is a perspective view taken along the line II-II of FIG. 5;

FIG. 7 is a sectional view taken in the direction of arrows III-III in FIG. 5;

8 is a sectional view (XZ section) taken along line IV-IV of FIG. 7;

FIG. 9 is a schematic view showing a shape of a resin strip formed in a composite resin flow channel.

FIG. 10 is a cross-sectional view taken along line III-III of FIG. 5 in another structural example.

11 is a sectional view taken along line VV in FIG. 10 (XZ section).
It is.

FIG. 12 is a schematic view showing a shape of a resin strip formed in a composite resin flow path.

FIG. 13 is a diagram showing an example in which a reducing die is attached to a composite resin outlet.

FIG. 14 is a YZ sectional view of a forming roll portion.

FIG. 15 is a sectional view showing another example of a light control element that can be manufactured by the method of the present invention.

FIG. 16 is a sectional view showing another example of the internal structure of the die pack.

17 is a sectional view taken along the line VI-VI in FIG.

18 is a sectional view taken along line VII-VII in FIG.

19 is an XY sectional view of the composite resin sheet extruded from the nozzle of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st extruder 2 2nd extruder 3 1st metering pump 4 2nd metering pump 5 Shaping head 6 Die pack 10 Forming roll group 11 1st flow path 12 2nd flow path 13, 14 Resin flow path for sheet base materials Reference Signs List 15 resin flow path for resin strip 16 sheet cutting machine 21 composite resin flow path 22 merging section 23 composite resin outlet 24 reduction die 31 resin discharge outlet for resin strip 32, 35, 36 resin discharge outlet for sheet base material 38 of molten resin Reservoir 41 Resin discharge port for slit-shaped resin strip 42 Resin discharge port for slit-shaped sheet base A Resin sheet B Transparent flake J Resin strip Ln, Rn Portion where length of discharge port (35, 36) in Z direction is large Lm, Rm Portion where the length of the discharge port (35, 36) in the Z direction is small φ Outflow angle of the resin for sheet base θ Angle of inclination of the resin strip

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yasuko Hayashi 3816 Noboru Noto, Tama-ku, Kawasaki-shi, Kanagawa F-term in the Tokyo Technical Information Center, Mitsubishi Rayon Co., Ltd. 4F207 AE10 AG01 AH73 KA01 KA17 KB21 KF01 KK04 KL57 KL63 KM16

Claims (10)

[Claims] 1. A light control wherein a plurality of flat resin strips having a flat cross section in a sheet section are embedded in a resin sheet in parallel, and a number of transparent flakes are arranged and dispersed in the resin strip. A method for manufacturing an element, having a predetermined width in the X direction, a predetermined thickness in the Y direction, and a predetermined length in the Z direction, wherein one end of the Z direction has a sheet base resin and a resin strip resin. Junction (2
2) A composite resin flow path (21) having a composite resin flow outlet (23) at the other end is provided, and the resin strip resin discharge port (31) faces the XY plane of the junction (22). Are provided at predetermined intervals in the X direction, and the resin outlets (35, 36) for the sheet base resin are formed so as to be directed toward the junction from both sides of the XZ plane of the junction (22) and extended in the X direction. ) Are disposed, and the discharge ports (35, 36) have a portion (Ln, Rn) having a large length in the Z direction and a portion (Ln) having a small length in the XZ cross section.
m, Rm) is discharged from a discharge port (31) using a device having a shape in which a transparent flake having a different refractive index from the resin is mixed into a resin for a resin strip,
Further, the molten resin for sheet base is discharged from the discharge ports (35, 36) to form a composite resin flow, and the composite resin flow outlet (2) is formed.
3. A method for manufacturing a light control element, comprising the step of: extruding a molten sheet from 3). 2. A discharge mixture (35, 36) wherein a plurality of transparent flakes having a different refractive index from the resin for the sheet base material are mixed and discharged from the discharge ports (35, 36).
A method for manufacturing the light control element according to the above. 3. A combination (Lm) of a portion having a large length in the Z direction and a portion having a small length in the Z direction of the discharge ports (35, 36) of the resin for a sheet base for every two discharge ports (31) of the resin for resin strip. 3. The method for manufacturing a light control element according to claim 1, wherein an apparatus in which Rn and Rn or Rm and Rn) are arranged is used. 4. The composite resin flow outlet (23) is provided with a flow channel reducing die (24) for reducing at least one of the width and the thickness of the composite resin flow. 4. The production method according to 2 or 3. 5. A molten sheet-like material discharged from an outlet (23) of a composite resin flow or an outlet of a reduction die (24) is sandwiched between at least a pair of forming rolls to form a pool of molten resin. The method for manufacturing a light control element according to claim 1, further comprising a step of extruding the light control element. 6. A light control in which a plurality of resin strips having a flat cross section in a sheet section are buried in parallel in a resin sheet, and a number of transparent flakes are arranged and dispersed in the resin strip. A method for manufacturing an element, having a predetermined width in the X direction, a predetermined thickness in the Y direction, and a predetermined length in the Z direction, wherein one end of the Z direction has a sheet base resin and a resin strip resin. Junction (2
2) A composite resin flow path (21) having a composite resin flow outlet (23) at the other end is arranged, and a plurality of rows of resin strip resin slits facing the XY plane of the junction (22). And a plurality of slit-shaped discharge ports (42) of a plurality of rows of sheet base resin are alternately arranged in parallel with the Y direction at a predetermined angle other than 0 °. A molten mixture in which a transparent flake having a different refractive index from the resin is mixed is discharged from the discharge port (41), and the molten resin for the sheet base is discharged from the discharge port (42) to form a composite resin flow. And extruding and forming a molten sheet from the outlet (23) of the composite resin flow. 7. The method according to claim 6, wherein the length Lj of the long side of the discharge port (41) is longer than the length La of the long side of the discharge port (42). 8. The light control according to claim 6, wherein a molten mixture in which a large number of transparent flakes having a different refractive index from the resin for the sheet base material are mixed is discharged from the discharge port (42). Device manufacturing method. 9. The composite resin flow outlet (23) is provided with a flow channel reduction die (24) for reducing at least one of the width and the thickness of the composite resin flow. 9. The production method according to any one of the above items 8. 10. A molten resin sheet discharged from the outlet of the composite resin outlet (23) or the outlet of the reduction die (24) is sandwiched between at least a pair of forming rolls to form a pool of molten resin. The method for manufacturing a light control element according to claim 6, further comprising: extruding.