JPH0727081B2 - Method for producing antiglare sheet having inclined laminated surface - Google Patents

Description

The present invention relates to a method for manufacturing an antiglare sheet having a sloping laminated surface, and in particular, it shields unnecessary external light, improves the contrast of the internal display section, and improves the visibility angle. Shaded, adjustable range
The present invention relates to a method for producing the above antiglare sheet having functions such as antiglare and identification with high thickness accuracy and low raw material loss.

(Prior Art and Its Problems) Conventionally, as shown in FIG. 3, an antiglare sheet having an inclined laminated surface of this type has transparent layers a and light shielding layers b alternately laminated (FIG. (Same b) After the support plate d is fixed to one side of the obtained block c (same c), the support plate is tilted and fixed to the wall surface e at the required inclination angle θ, and the block portion is fixed. Slice vertically (same d)
Alternatively, a similar block c is cut as it is in an oblique direction at a desired inclination angle θ (same as e), and a support plate d is fixed to the cut surface (same f), and then the support plate d is vertically placed. Wall surface e
It is manufactured by a method (the same g) in which the block part is tilted at the complement of the tilt angle θ and this part is sliced in the vertical direction. However, the former method slices the block in the direction of displacement with respect to the stacking plane, so the moments are different for each slice and thickness unevenness is likely to occur, while the latter method has good thickness accuracy, but has the disadvantage of large loss of raw materials. It was

(Means for Solving Problems) The present invention relates to a method for producing an antiglare sheet having an inclined laminated surface with good thickness accuracy and less loss of raw materials, in which light shielding layers and transparent layers are alternately arranged. An inclination angle for obtaining an angle between a substrate surface and a virtual surface with which one edge of each sheet makes up a plurality of sheets or a plurality of sheets in which a light shielding layer and a transparent layer are alternately laminated in parallel. So as to form a complementary angle, the positions are laterally shifted and stacked on the substrate, and these stacked products are heated and pressed to be integrated, and the obtained block body is arranged on the virtual plane. After fixing to the support plate with an adhesive, the support plate is fixed and the block portion is sliced in the direction parallel to this surface.

Next, the details of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 shows a material applied to the method of the present invention, in which a light-shielding layer 1 and a transparent layer 2 form a set (sheet a), and a light-shielding layer 1 and a transparent layer 2 are superposed. Laminated sheet 3
(Fig. B), a laminated sheet 3b (Fig. C) in which a plurality of the laminated sheets 3 are further laminated.

FIG. 2 shows an outline of the method for producing an antiglare sheet according to the present invention. Reference numeral 4 denotes a stack in which a plurality of sheets are alternately stacked if the material is a separate sheet of the light shielding layer 1 and the transparent layer 2. If the material is the laminated sheet 3 in which the light-shielding layers 1 and the transparent layers 2 are alternately laminated in parallel, it indicates that this is a stack of a plurality of layers.

FIG. A shows a method for manufacturing an antiglare sheet by sequentially stacking a plurality of these sheets on a substrate 5 placed horizontally, and each sheet has a virtual surface where this substrate surface 5a and one edge of each sheet contact each other. Inclination angle θ determined by the angle α formed with p
After stacking so as to form a complementary angle on the substrate 5 by laterally shifting the position, a mold 6 is applied to the stack 4 from above to heat and pressurize the stack 4, and the obtained block body 7 is formed. The support plate 8 disposed on the virtual surface p is fixed with an adhesive 9 (see FIG. C).

On the other hand, FIG. B shows a method for performing this step more efficiently. Here, as the substrate 5, a jig 5b having an inclined surface whose inclination is equal to the required inclination angle θ is used, and a sheet is placed thereon. Stack in a diagonal position. At this time, a support plate 8 is vertically set up beside the jig 5b so that the stacked sheet-shaped light-shielding layer 1, transparent layer 2 and laminated sheet 3 do not slip off. It should be noted that the upper and lower surfaces thereof may be satin-finished in advance, and this provides the effect of preventing slippage during thermocompression molding and preventing ghosts in the product. The piled up stacks 4 further have a jig 5c on this.
Then, the block body 7 is heat-pressed from above from above with the mold 6 in this state, and this is bonded to the vertical support plate 8 with the adhesive 9 as in the previous example (see FIG. C).

Next, in any case, when the support plate 8 is fixed to the wall surface 10 or the like and the block portion 7b is sliced in the direction parallel to this surface (FIG. D), the antiglare sheet having the inclined laminated surface according to the present invention 11 is obtained (figure e).

The light shielding layer 1 constituting the antiglare sheet 11 includes polyvinyl chloride, polyethylene, polypropylene, polyvinyl acetate, ionomer, nylon (trade name), thermoplastic resins such as PBT, butylene styrene rubber, neoprene rubber,
Acrylic nitrile butadiene, styrene butadiene Styrene, silicone rubber or other elastomer or synthetic rubber as a base, on which one or two fillers such as carbon black, pigment, dye, calcium carbonate, talc, metal powder, single fiber powder A film made of a material having a light transmittance of 40% or less, preferably 20% or less and having a light-shielding property and capable of coextruding is used, which is a mixture of two or more kinds.

Further, this base material is a transparent thin film base, at least one surface of which is coated with a light-shielding ink, a light reflection layer having metallic luster provided by Al vapor deposition, sputtering, etc., or a composite of these. You can use An example of the light-shielding ink is a thermosetting epoxy resin ink containing a carbon-based pigment having a good hiding property even in a thin film, and the thickness accuracy of this coating film is 8 ± 1.
It can be set to μm. In addition, the thin film reflective layer can be formed by setting the thickness of the deposited film by Al vapor deposition to about 600Å.

On the other hand, the transparent layer 2 is made of polyvinyl chloride, polyethylene, polypropylene, polyvinyl acetate, cellulose, silicone rubber or the like having a light transmittance of 80% or more.

The transparency of this antiglare sheet is such that when the thickness of the transparent layer 2 constituting the fine interdigital configuration is W ₁ and the thickness of the light shielding layer 1 is W ₂ , the transmission ratio of parallel rays W ₁ / W ₁ + W ₂ , Also, it is determined by the extinction coefficient and the surface reflectance of the transparent layer 2 itself, and this visible angle range is determined by the refractive index n of the transparent layer 2 and the thickness W ₁ and the slice thickness t of the antiglare sheet. , This W ₁ is 50
μm-0.3 mm, preferably 75 μm-0.2 mm, W ₂ is 5
The range of up to 20 μm does not cause any trouble for human eyes, but it is preferably 5 to 10 μm, and the tolerance thereof is also preferably ± 1 to 2 μm. According to this, the maximum transparency is about 85% in light transmittance,
The visible angle range is 30 to 16 depending on the slice thickness of the anti-glare sheet
The one at 0 ° is useful. In addition, this anti-glare sheet has a visible angle range that is asymmetric with respect to the sheet surface that is effective when looking up at a high-altitude display, and this angle is arbitrarily selected, but in practical use, it is in the range of 0 to 30 °. Is preferred. Further, this visible angle tolerance can be set to a minimum of ± 2 ° in order to improve the thickness accuracy of the light shielding layer 1.

On the other hand, the thickness W ₂ of the light-shielding layer 1 is usually the thickness of the colored plastic film, but in the case where the light-shielding ink layer or the Al vapor deposition layer is provided on the surface of the transparent plastic film, the thickness of the light-shielding ink layer or the Al vapor deposition layer is Since W ₂ is W ₂ , an antiglare sheet with further improved transparency can be obtained.

The sheet used in the stack 4 of the present invention is a composite film obtained by co-extruding the material forming the transparent layer 2 and the material forming the light-shielding layer 1, each of which is individually formed into a film. There are a molded product, a film in which the two films are laminated so that the bonding surfaces are parallel to each other, and a film in which multiple films are alternately laminated.

The adhesive 9 used to fix the block body 7 obtained by stacking the sheets by the above-mentioned method and hot pressing to the support plate 8 is a silicone rubber compound or a conventionally known adhesive such as vinyl chloride. -Vinyl acetate copolymer-based adhesives, cyanoacrylate-based adhesives and the like can be mentioned.

The antiglare sheet 11 according to the present invention described above may have a transparent or at least 60% or more colored transparency on at least one surface thereof, and may be a laminate of a silicone rubber layer, a plastic film layer, or a glass plate layer. Good.

The layered silicone rubber layer has elastic properties, has excellent secondary processability such as punching, and also has adhesion to the mirror surface.By using this as a transparent mirror surface layer, It can be a good antiglare sheet.

When the plastic film layers are stacked, the surface of the plastic film can be subjected to a non-glare treatment or a hard coat treatment, and a more value-added antiglare sheet is constituted. In other words, due to the stacking of plastic films on this surface, the elastic anti-glare sheet is compounded into a rigid one that does not stretch, and when it is punched or printed, it has good dimensional stability and dimensional accuracy. Therefore, bending and curved surface processing by secondary processing become easy. As the plastic film used for these, the same thermoplastic as that constituting the light-shielding layer is preferable. If this is an acrylic resin, it will have excellent weather resistance, if it is a polyester film, it will have good heat resistance, and if it is a polycarbonate film, it will have excellent physical strength such as dimensional stability, heat resistance, and impact resistance. You can get what you want.
Further, it is also possible to print on the integrated film so as to serve also as a display body, or to apply a hard coat agent containing an ultraviolet absorber on the surface.

In addition, a stack of glass plates has excellent abrasion resistance and is hard to be scratched on the surface, and a non-reflective non-glare-treated product has excellent heat resistance.

Since the antiglare sheet having an inclined laminated surface thus obtained has a structure in which transparent layers and light-shielding layers are alternately laminated, when it is installed on the front surface of a display body or a meter instrument,
The light from the display has a visible angle range and has an antiglare effect. In addition, when installed on an outdoor indicator light or traffic light, unnecessary external light that enters the inside of the display,
That is, it has an effect of blocking sunlight and improves the contrast of the display body. Further, in the case where a reflective layer such as an Al vapor deposition layer is provided on one surface of the light shielding layer, the light is reflected by the reflective layer without reducing the amount of light emitted from the display body, so that a clear display can be obtained.

Next, specific embodiments of the present invention will be described with reference to examples.

(Example) To 100 parts of transparent silicone rubber on-pound KE164u (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), 2 parts of C-2 (same as the trade name) as a peroxide vulcanizing agent was added and compounded. A silicone rubber compound is applied to a thickness of 120 ±
After sheeting to a width of 5 μm and width of 300 mm and vulcanization, 100 parts of silicone rubber compound KE981u (same as above, trade name), 15 parts of carbon black, 2 parts of vulcanizing agent C-8 (same as above, trade name) on the upper surface. The black rubber compound mixed with was mixed with a calendering device to a thickness of 12 ± 3 μm, and in the unvulcanized state, the size was 150 mm × 300 mm and the thickness was 132 μm.
m sheet. Thirty pieces, which were stacked to form a laminated sheet having a thickness of 10 mm, were sequentially stacked on the upper surface of a jig having an inclination of 18 ° (see FIG. 2b). A support plate made of aluminum was set up vertically next to the jig to prevent the laminated body from sliding down. This is directly integrated by heat pressing, and the obtained block is bonded to a support plate using silicone rubber compound KE45 (same as the trade name), and the support plate is fixed to the wall surface, and the thickness is parallel to this. 0.35 ±
Slicing at 0.025 mm yielded 326 antiglare sheets with a louver angle of 18 °. When this is performed by the conventional method, the number of slices of the standard product obtained is only 61, and the yield is improved about 5 times.

(Effects of the Invention) According to the present invention, an antiglare sheet having an inclined laminated surface can be manufactured extremely efficiently with high thickness accuracy and low raw material loss.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 (a) to 1 (c) are cross-sectional explanatory views of materials used in the present invention, and FIG. 2 is an example of a method for producing an antiglare sheet according to the present invention. ) And (b) are different block body forming steps, (c) is a support plate joining step, and (d) is an explanatory view of a slicing step,
(E) is a perspective view of the obtained antiglare sheet. FIG. 3 is an explanatory view showing a conventional method for producing an antiglare sheet. (A) is a laminating step, (b) is a pressure molding step, (c) and (d).
Is the step of joining and slicing the support plates by the method for the block body obtained in (b), (e)
(G) shows a cutting step, a support plate joining step, and a slicing step, respectively, by the same method. (Explanation of main symbols) 1 ... Shading layer, 2 ... Transparent layer, 3 ... Laminated sheet, 4 ... Stacked material, 5 ... Substrate, 5a ... Substrate surface, 7 ... Block body, 7b …… Block part, 8 …… Support plate, 9 …… Adhesive, 11 …… Anti-glare sheet, p …… Virtual plane, θ …… Inclination angle, α …… Angle between substrate surface 5a and virtual plane p .

Claims (3)

[Claims] 1. A plurality of sheets forming a set by alternately arranging a light-shielding layer and a transparent layer, or a plurality of sheets in which a light-shielding layer and a transparent layer are alternately laminated in parallel with a substrate surface. The sheets are sequentially stacked on the substrate by shifting the position laterally so as to form a complementary angle of the inclination angle with the imaginary plane with which one edge of the sheet makes contact, and the stacked products are heated and pressed to be integrated, The obtained block body is fixed to a support plate disposed on the virtual surface with an adhesive, and then the support plate is fixed to slice the block portion in a direction parallel to this surface. A method for producing an antiglare sheet having an inclined laminated surface. 2. The method for producing an antiglare sheet having an inclined laminated surface according to claim 1, wherein the substrate is placed horizontally, and a plurality of sheets are stacked horizontally on the substrate. 3. A jig having a slope equal to a desired inclination angle of a substrate, a support plate is provided vertically in contact with the jig, and a plurality of sheets are prevented from slipping by the support plate to be cured. Stacked diagonally on the tool, heat and pressurize the stack in this state to form a block body, and fix this and a vertical support plate with an adhesive, then fix the support plate and slice the block portion Patent A method for producing an antiglare sheet having an inclined laminated surface according to item 1.