JP2017146392A - Processing method for polarizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a processing method for a polarizer that can reduce the occurrence of cracks when the polarizer is processed.SOLUTION: A processing method for a polarizer comprises the steps of: placing a polarizer 1 on a weak adhesive layer 2 that has adhesivity, an inner part processed in a predetermined shape, and an oval shape part 2a; processing an inner part of the polarizer 1 in a predetermined shape so that the inner part of the polarizer 1 placed on the weak adhesive layer 2 has an oval shape part 1a; and pushing down the oval shape part 2a of the weak adhesive layer 2 and the oval shape part 1a of the polarizer 1 vertically downward with a pushing-down bar TB (refer to Figure 3 (b)).SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method of processing a polarizing plate that separates incident light into transmitted light and reflected light according to the polarization direction.

  In recent years, in a liquid crystal display device or the like, as a thin polarizing plate, a polarizing film in which an iodine compound is adsorbed on a polyvinyl alcohol (PVA) film and stretched and oriented to develop visible light dichroism is often used. (For example, patent document 1).

Japanese Patent Laid-Open No. 10-048625

  However, since the polarizing plate as described above has stretchability, when the polarizing plate (particularly the inner portion) is processed into a predetermined shape using a cutting blade or the like, the polarizing plate extends in the stretching direction, Accordingly, there is a problem that cracks may occur in the stretching direction of the polarizing plate.

  In view of the above problems, an object of the present invention is to provide a method for processing a polarizing plate that can reduce the occurrence of cracks when processing the polarizing plate.

  The object of the present invention is achieved by the following means. In addition, although the code | symbol in a parenthesis attaches the referential mark of embodiment mentioned later, this invention is not limited to this.

According to the processing method of the polarizing plate of claim 1, the polarizing plate is applied to the support member (weak adhesive layer 2) having the adhesive force and the inner portion processed into a predetermined shape and having the first shape portion (elliptical portion 2a). A step of placing (1) (see FIG. 2B);
The inner part of the polarizing plate (1) is shaped into a predetermined shape so that the inner part of the polarizing plate (1) placed on the support member (weak adhesive layer 2) has a second shape part (elliptical part 1a). A processing step (see FIG. 2C);
The first shape portion (elliptical shape portion 2a) of the support member (weak adhesive layer 2) and the second shape portion (elliptical shape portion 1a) of the polarizing plate (1) are dropped using a drop-off member (drop-off rod TB). And a step of pushing down vertically (see FIG. 3B).

  Further, according to the invention of claim 2, in the method for processing a polarizing plate according to claim 1, the inner part of the polarizing plate (1) is predetermined so as to have the second shape part (elliptical part 1a). In processing into a shape, the inner part of the polarizing plate (1) is cut so that the support member (weak adhesive layer 2) is not cut.

Furthermore, according to invention of Claim 3, in the processing method of the polarizing plate of the said Claim 1 or 2, the diameter of the 2nd shape part (elliptical part 1a) of the said polarizing plate (1) is the said support. The diameter of the member (weak adhesive layer 2) is smaller than the diameter of the first shape portion (elliptical shape portion 2a),
A diameter of the drop-off member (drop-off rod TB) is smaller than a diameter of the second shape portion (elliptical shape portion 1a) of the polarizing plate (1).

  And according to invention of Claim 4, in the processing method of the polarizing plate of any one of the said Claims 1-3, it uses vertically downward (FIG. 3 (a) using the said dropping member (push-off stick TB). ) (See the direction of arrow Y1) of the support member (weak adhesive layer 2) and the second shape part (elliptical part 1a) of the polarizing plate (1) and the first shape part (elliptical part 2a) of the polarizing plate (1). The push-off member (push-off rod TB) is housed in a hole (Da) of a storage member (mold D) in which a hole (Da) into which the push-out member (push-off rod TB) can be inserted and removed is formed.

  Next, effects of the present invention will be described with reference numerals in the drawings. In addition, although the code | symbol in a parenthesis attaches the referential mark of embodiment mentioned later, this invention is not limited to this.

  According to the invention of claim 1, since the supporting member (weak adhesive layer 2) is disposed on the lower surface of the polarizing plate (1), the supporting member is formed when the inner part of the polarizing plate (1) is processed into a predetermined shape. (Weak adhesive layer 2) prevents the extension of the polarizing plate (1) in the stretching direction, thereby reducing the occurrence of cracks. Further, in this state, the second shape portion (elliptical shape portion 1a) and the support member (weak adhesive layer 2) formed on the inner side of the polarizing plate (1) using the drop-off member (drop-off rod TB). By projecting the first shape part (elliptical part 2a) formed in the inner part vertically downward, only the second shape part (elliptical part 1a) formed in the inner part of the polarizing plate (1). The force is applied, and the force is not applied to the portion of the polarizing plate (1) other than the second shape portion (ellipsoidal shape portion 1a) of the polarizing plate (1). It is possible to prevent elongation in the extending direction of the polarizing plate (1) other than the shape portion (elliptical shape portion 1a). Thereby, a polarizing plate can be processed, reducing generation | occurrence | production of a crack.

  According to the invention of claim 2, when the inner portion of the polarizing plate (1) is processed into a predetermined shape so as to have the second shape portion (elliptical shape portion 1 a), the support member (weak adhesive layer 2) Since the inner part of the polarizing plate (1) is cut so as not to be cut, the elongation in the stretching direction of the polarizing plate (1) can be further prevented, and the occurrence of cracks can be further reduced.

  Furthermore, according to invention of Claim 3, the diameter of the 2nd shape part (elliptical shape part 1a) of a polarizing plate (1) is the 1st shape part (elliptical shape part 2a) of a supporting member (weak adhesion layer 2). Since the diameter of the drop-off member (drop-off rod TB) is smaller than the diameter of the second shape portion (elliptical portion 1a) of the polarizing plate (1), the drop-off member (drop-off) The second shape portion (elliptical shape portion 1a) formed on the inner part of the polarizing plate (1) can be easily separated from the polarizing plate (1) by the rod TB), and further, the supporting member (weak adhesion) The first shape portion (elliptical shape portion 2a) formed in the inner portion of the layer 2) can be easily separated from the support member (weak adhesion layer 2).

  According to the invention of claim 4, the first of the support member (weakly adhesive layer 2) pushed down vertically (see the direction of arrow Y <b> 1 in FIG. 3A) using the drop-off member (drop-off rod TB). The shape part (elliptical part 2a) and the second shape part (elliptical part 1a) of the polarizing plate (1) are storage members (holes Da) into which the drop-off member (drop-off rod TB) can be inserted and removed ( Since it is stored in the hole (Da) of the mold D), the waste can be stored in one place, and the waste can be easily and easily discarded.

(A) is a top view of the polarizing plate which concerns on one Embodiment of this invention, (b) is a top view which shows the state which mounted the polarizing plate shown to (a) on the upper surface of the weak adhesion layer which concerns on the embodiment, (C) is a top view which shows the state which processed the desired shape in the inner side part of the polarizing plate which concerns on the same embodiment. (A) is the sectional view on the AA line shown to Fig.1 (a), (b) is sectional drawing on the BB line shown in FIG.1 (b), (c) is the inner part of the polarizing plate which concerns on the same embodiment. It is sectional drawing which shows the state which processes the desired shape using a cutting blade. (A) is sectional drawing which shows the state which is going to push down the process part vertically downward using a stick-off bar, after processing a desired shape into the inner part of the polarizing plate concerning the embodiment using a cutting blade (B) is sectional drawing which shows the state which, after processing a desired shape using the cutting blade in the inner part of the polarizing plate which concerns on the same embodiment, the processed part was pushed down vertically downward using the stick-off rod. .

  Hereinafter, an embodiment of a method for processing a polarizing plate according to the present invention will be described in detail with reference to FIGS. In addition, in the following description, when showing the direction of up, down, left and right, it means up, down, left and right when viewed from the front of the figure.

  First, the polarizing plate according to this embodiment will be described.

  The polarizing plate 1 can separate incident light into transmitted light and reflected light according to the polarization direction, and is formed in a rectangular shape in plan view as shown in FIG. As shown in FIG. 2A, the polarizing plate 1 is a long base separator 10, an adhesive 11 disposed on the base separator 10, and an adhesive 11. A triacetyl cellulose film (TAC film) 12, a polarizer 13, a TAC film 14, a retardation film 15, and a protective film 16 are included.

  The base separator 10 is formed with a thickness of about 40 μm, and a fluoropolymer (for example, polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, Chlorofluoroethylene-vinylidene fluoride copolymer, etc.) and low adhesive substrates made of nonpolar polymers (for example, olefinic resins such as polyethylene and polypropylene).

  On the other hand, the pressure-sensitive adhesive 11 is formed with a thickness of about 25 μm. For example, the pressure-sensitive adhesive 11 is based on an acrylic polymer, silicone polymer, polyester, polyurethane, polyamide, polyether, fluorine-based or rubber-based polymer. It is formed with what can be appropriately selected and used.

  The TAC films 12 and 14 are formed with a thickness of about 40 μm, and are formed of a triacetyl cellulose resin film containing triacetyl cellulose (TAC) as a main component.

  The polarizer 13 has a function of extracting unpolarized light (natural light), partial polarized light, or polarized light (linearly polarized light) that vibrates only in a specific direction from the polarized light, and is formed with a thickness of about 20 μm. Alternatively, a film made of a hydrophilic polymer such as ethylene-modified polyvinyl alcohol having an ethylene unit content of 1 to 4 mol%, a degree of polymerization of 2000 to 4000, and a degree of saponification of 99.0 to 99.99 mol% may be used. It is formed by stretching by treating with a chromatic dye or by treating and orienting a plastic film such as vinyl chloride.

  On the other hand, the retardation film 15 has a retardation adjustment function, is formed with a thickness of about 70 μm, and is made of a cellulose resin such as triacetyl cellulose (TAC), polyester, polycarbonate, norbornene, or polyamide. Birefringent film obtained by stretching a polymer film such as polyimide, polyethersulfone, polysulfone, polystyrene, acrylic, acetate, polyolefin, etc., alignment film of liquid crystal polymer, alignment layer of liquid crystal polymer It is formed with the laminated body etc. which were supported with the film. In addition, in order to improve the adhesiveness with the polarizer 13, the surface of the retardation film 15 may be saponified with alkali or the like, or may be subjected to appropriate primer treatment on the surface. .

  The protective film 16 has a function of preventing the polarizer 13 from contracting and expanding, and preventing deterioration due to ultraviolet rays, and is formed with a thickness of about 60 μm, and has transparency, mechanical strength, heat It is formed of a thermoplastic resin that is excellent in stability, moisture shielding properties, retardation value stability, and the like. Examples of the thermoplastic resin constituting such a protective film 16 include (meth) acrylic resins typically represented by methyl methacrylate resins, polyolefin resins typically represented by polypropylene resins, and cyclic olefin resins. , Polyvinyl chloride resin, cellulose resin, styrene resin, acrylonitrile / butadiene / styrene resin, acrylonitrile / styrene resin, polyvinyl acetate resin, polyvinylidene chloride resin, polyamide resin, polyacetal resin, polycarbonate Resin, modified polyphenylene ether resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polysulfone resin, polyethersulfone resin, polyarylate resin, polyamideimide resin, polyimide resin, etc. And the like.

  Thus, the polarizing plate 1 configured as described above is processed as follows.

  That is, when the polarizing plate 1 is processed, that is, when a desired shape is formed on the inner side of the polarizing plate 1, first, as shown in FIGS. The polarizing plate 1 is placed on the upper surface. The weak adhesive layer 2 is formed with a thickness of about 40 μm and includes a weak adhesive that can be peeled and / or re-adhered. Examples of the weak adhesive include rubber adhesives and acrylic adhesives. , Silicone-based pressure-sensitive adhesives, polyvinyl-based pressure-sensitive adhesives, polyurethane-based pressure-sensitive adhesives, and any composite materials thereof.

  Thus, when the weak adhesive layer 2 configured as described above is used to cut the inner part of the polarizing plate 1 using a cutting blade K (see FIG. 2C) described later, In order to prevent elongation, as shown in FIGS. 1B and 2B, an elliptical portion 2a having a center line O1 as a base point is formed in advance on the inner portion of the weak adhesive layer 2. The elliptical portion 2a has a diameter of about 2.4 mm, for example, and is pushed downward vertically by a sticking rod TB (see FIG. 2) to be described later, that is, a portion of the elliptical portion 2a from the weak adhesive layer 2 Only the inner part of the weak adhesive layer 2 is previously processed by a cutting blade or a laser so that only the lower part is pushed downward.

  Next, after placing the polarizing plate 1 on the upper surface of the weak adhesive layer 2 (see FIGS. 1B and 2B), as shown in FIG. Cutting into a desired shape using the cutting blade K. That is, as shown in FIG. 2C, the cutting blade K is formed so that an elliptical portion 1a having a center line O2 having a diameter of about 2.0 mm as a base point is formed in the inner portion of the polarizing plate 1, for example. Is used to cut the inner part of the polarizing plate 1. At this time, since the weak adhesive layer 2 is disposed on the lower surface of the polarizing plate 1 (base separator 10), when the inner portion of the polarizing plate 1 is cut, the weak adhesive layer 2 causes the elongation in the stretching direction of the polarizing plate 1 to occur. Is prevented, and the occurrence of cracks can be reduced. When the inner part of the polarizing plate 1 is cut using the cutting blade K, the inner part of the polarizing plate 1 is completely cut using the cutting blade K as shown in FIG. It is preferable that 2 itself is not cut or cut slightly and not cut completely. This is because, if the weak adhesive layer 2 itself is completely cut, the prevention of elongation in the stretching direction of the polarizing plate 1 is reduced, which may cause cracks. Therefore, it is preferable that the weak adhesive layer 2 itself is not completely cut. In addition, as shown in FIG. 2 (c), the center line O 2 that is the base point of the elliptical portion 1 a formed on the inner portion of the polarizing plate 1 and the ellipse formed on the inner portion of the weak adhesive layer 2. The center line O1, which is the base point of the shape portion 2a, is on the same line.

  Next, after the inner portion of the polarizing plate 1 is cut into a desired shape using the cutting blade K, an ellipse formed on the inner portion of the polarizing plate 1 using a push-off rod TB as shown in FIG. The oval shaped part 2a formed on the inner part of the shaped part 1a and the weak adhesive layer 2 is pushed downward vertically. More specifically, the push-out bar TB is a cylindrical bar having a diameter of about 1.6 mm and can move up and down (moves vertically upward and vertically downward). Then, such a push-off rod TB is formed into an elliptical part 1a formed in the inner part of the polarizing plate 1 and an elliptical part formed in the inner part of the weak adhesive layer 2, as shown in FIG. When the polarizing plate 1 is moved from the upper side to the lower side (in the direction of the arrow Y1) so as to push down 2a vertically downward, as shown in FIG. The elliptical portion 1a is separated from the polarizing plate 1, and the elliptical portion 2a formed in the inner portion of the weak adhesive layer 2 is separated from the weak adhesive layer 2, so that the elliptical portion 1a and the elliptical portion 1a The shape part 2a is pushed down vertically downward. Then, when the push-out bar TB is moved from the lower side (arrow Y1 direction) to the upper side (the opposite direction to the arrow Y1 direction), as shown in FIG. 1C (see also FIG. 3B), the polarizing plate 1 is formed with an elliptical through-hole 1a1 (an elliptical through-hole 2a1 inside the weak adhesive layer 2), and thus a desired shape is formed inside the polarizing plate 1. Become. At this time, the oval-shaped portion 1a formed in the inner portion of the polarizing plate 1 is easily separated from the polarizing plate 1 by the stick-off rod TB, and further, the oval-shaped portion formed in the inner portion of the weak adhesive layer 2 The diameter of the elliptical part 1a formed in the inner part of the polarizing plate 1 is the diameter of the elliptical part 2a formed in the inner part of the weak adhesive layer 2 so that 2a can be easily separated from the weak adhesive layer 2. The diameter of the push-out bar TB is made smaller than the diameter of the elliptical portion 1a formed in the inner part of the polarizing plate 1. Thereby, the oval-shaped part 1a formed in the inner part of the polarizing plate 1 can be easily separated from the polarizing plate 1 by the stick-off rod TB, and the oval-shaped part formed in the inner part of the weak adhesive layer 2 2a can be easily separated from the weak adhesive layer 2. Further, the elliptical portion 1a formed on the inner portion of the polarizing plate 1 is more easily separated from the polarizing plate 1, and the elliptical portion 2a formed on the inner portion of the weak adhesive layer 2 is the weak adhesive layer 2. As shown in FIG. 3 (a), the axis O3 of the push-off rod TB and the center line O2 that is the base point of the elliptical portion 1a formed in the inner part of the polarizing plate 1, as shown in FIG. The center line O1, which is the base point of the elliptical portion 2a formed in the inner part of the weak adhesive layer 2, is on the same line. In this way, the elliptical portion 1a formed on the inner portion of the polarizing plate 1 can be more easily separated than the polarizing plate 1, and the elliptical portion 2a formed on the inner portion of the weak adhesive layer 2 is weak. It can be more easily separated than the adhesive layer 2.

  By the way, the elliptical part 1a of the polarizing plate 1 and the elliptical part 2a of the weak adhesive layer 2 that are pushed down vertically by the sticking bar TB are holes having a diameter of about 2.4 mm, as shown in FIG. It is stored in a mold D in which Da is formed. That is, when the oval-shaped portion 1a of the polarizing plate 1 and the oval-shaped portion 2a of the weak adhesive layer 2 are pushed down vertically by the push-down rod TB, as shown in FIG. It rushes into the hole Da of the mold D. As a result, the elliptical portion 1a of the polarizing plate 1 and the elliptical portion 2a of the weak adhesive layer 2 are pushed in the direction of the arrow Y2 in the hole Da of the mold D. Then, when the push-out bar TB is extracted from the hole Da of the mold D (moved from the lower side (arrow Y1 direction) to the upper side (the direction opposite to the arrow Y1 direction)), the hole D of the mold D is The elliptical part 1a of the polarizing plate 1 and the elliptical part 2a of the weak adhesive layer 2 are accommodated. Thereby, the waste of the elliptical part 1a of the polarizing plate 1 separated from the polarizing plate 1 and the elliptical part 2a of the weakly adhesive layer 2 separated from the weak adhesive layer 2 can be stored in one place, Waste can be discarded easily and easily. Note that the elliptical portion 1a of the polarizing plate 1 and the elliptical portion 2a of the weak adhesive layer 2 that have been pushed vertically downward by the sticking rod TB are located in the hole Da of the mold D as shown in FIG. Are stacked in order from bottom to top (the broken line portion shown in FIG. 3 (b) shows the elliptical portion 1a of the polarizing plate 1 and the elliptical shape portion 2a of the weak adhesive layer 2 that had been pushed down last time, and is shown in FIG. 3 (b). The solid line portions are the oval-shaped portion 1a of the polarizing plate 1 and the oval-shaped portion 2a of the weak adhesive layer 2 that have been pushed down this time).

  Thus, the polarizing plate 1 is processed into a desired shape through the steps as described above.

  Thus, according to the present embodiment described above, the weak adhesive layer 2 is disposed on the lower surface of the polarizing plate 1 (base separator 10). Therefore, when the inner part of the polarizing plate 1 is cut, the weak adhesive layer 2 is cut. Thus, the elongation in the stretching direction of the polarizing plate 1 is prevented, and the generation of cracks can be reduced. Further, in this state, by using the drop-off rod TB, the elliptical portion 1a formed on the inner portion of the polarizing plate 1 and the elliptical portion 2a of the weak adhesive layer 2 are pushed downward vertically, thereby polarizing plate 1 The force is applied only to the elliptical portion 1a formed in the inner portion of the polarizing plate 1, and the force is not applied to the portion of the polarizing plate 1 other than the elliptical portion 1a of the polarizing plate 1. It is possible to prevent elongation in the extending direction of the polarizing plate 1 other than the elliptical portion 1a. Thereby, a polarizing plate can be processed, reducing generation | occurrence | production of a crack.

  In addition, the polarizing plate illustrated in this embodiment is an example to the last, and can be applied to any polarizing plate. For example, a polarizing plate without the retardation film 15 or a polarizing plate with a brightness enhancement film may be used.

  Moreover, in this embodiment, the elliptical shape part 2a of the weak adhesion layer 2 is made into the same shape as the desired shape (in this embodiment, the elliptical shape part 1a) formed in the inner part of the polarizing plate 1. However, the present invention is not limited to this, and the shape may not be the same as the desired shape formed on the inner portion of the polarizing plate 1, such as a rectangular shape.

  Furthermore, in the present embodiment, an example in which the push-off rod TB is formed in a columnar shape is shown, but the present invention is not limited thereto, and any shape may be used.

1 Polarizing plate 1a Elliptical part (second shape part)
2 Weak adhesive layer (support member)
2a Elliptical part (first shape part)
TB Sticking stick (sticking member)
D Mold (Storage material)
Da hole

Claims (4)

A step of placing the polarizing plate on a support member having an adhesive force and an inner portion processed into a predetermined shape and having a first shape portion;
Processing the inner part of the polarizing plate into a predetermined shape such that the inner part of the polarizing plate placed on the support member has a second shape part; and
And a step of pushing down the first shape portion of the support member and the second shape portion of the polarizing plate vertically downward using a dropping member.   2. The polarizing plate according to claim 1, wherein the inner portion of the polarizing plate is cut so that the supporting member is not cut when the inner portion of the polarizing plate is processed into a predetermined shape so as to have the second shape portion. Processing method. The diameter of the second shape portion of the polarizing plate is smaller than the diameter of the first shape portion of the support member,
3. The method for processing a polarizing plate according to claim 1, wherein a diameter of the sticking member is smaller than a diameter of the second shape portion of the polarizing plate. The first shape part of the support member and the second shape part of the polarizing plate, which are pushed down vertically using the push-down member, are stored in the holes of the storage member in which holes through which the drop-off member can be inserted and removed are formed. The processing method of the polarizing plate of any one of Claims 1-3 formed.

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