JP6612294B2 - Cutting device and method of manufacturing polarizing plate - Google Patents

Description

  The present invention relates to a cutting device and a method for manufacturing a polarizing plate.

  The polarizing plate is an optical component that constitutes a liquid crystal display device such as a liquid crystal television or a smartphone. In recent years, with the demand for small and thin liquid crystal display devices, a thin polarizing plate with high dimensional accuracy is required. However, the polarizer constituting the polarizing plate is thin and easily damaged. In order to protect such a polarizer, in the production of a conventional polarizing plate, one or more optical films (for example, protective films) are bonded to one or both sides of the polarizer to produce a first laminate. To do. Subsequently, a second laminated body having a desired shape is formed by cutting or punching the first laminated body. However, it is difficult to adjust the dimensions of the second laminate with high accuracy only by a single cutting or punching process. In order to increase the dimensional accuracy of the second laminate, the end portion of the second laminate must be cut or polished. For example, in Patent Documents 1 and 2 below, a plurality of second laminates are stacked to form a third laminate, and the third laminate is fixed mechanically and mechanically by a clamp, A technique for cutting each end face of the three-layered body with a rotary blade is disclosed. That is, in the cutting methods described in Patent Documents 1 and 2 below, end faces of a plurality of second laminated bodies constituting the third laminated body are cut together.

Japanese Patent No. 4359413 Japanese Patent No. 5823676

  However, when the end surface of the laminate (third laminate) is cut using a conventional cutting device, the end surface is difficult to cut uniformly. As a result, seams (streaks) are formed on the end face of the finally obtained polarizing plate, or the dimensions of the polarizing plate vary.

  The present invention has been made in view of the above circumstances, and has a uniform and flat end face, a cutting device capable of producing a polarizing plate excellent in dimensional accuracy, and a polarizing plate using the cutting device. It aims at providing the manufacturing method of.

  A cutting device according to one aspect of the present invention includes a table, a plate facing the surface of the table, and a magnet that fixes a laminate including a film-like polarizer between the table and the plate by a magnetic force. A clamp, a cutting tool that cuts the end face of the laminate, and a moving device that moves at least one of the table and the cutting tool along the end face.

  In the cutting device according to one aspect of the present invention, the laminate may be a quadrangular prism having a first end surface and a second end surface adjacent to the first end surface, and the moving device may include a table and a cutting tool. A first moving device that moves at least one of them along the first end surface, and a second moving device that moves at least one of the table and the cutting tool along the second end surface may be included.

  In the cutting apparatus according to one aspect of the present invention, the cutting tool may be an end mill.

  A manufacturing method of a polarizing plate according to one aspect of the present invention is a method of manufacturing a polarizing plate using the cutting device, and includes a step of forming a laminate, and at least of a table and a cutting tool using a moving device. Cutting one end face of the laminate fixed between the base and the plate with a cutting tool while moving one side along the end face.

  A manufacturing method of a polarizing plate according to one aspect of the present invention is a method of manufacturing a polarizing plate using the cutting device, and includes a step of forming a laminate, and a step and a cutting tool using a first moving device. Cutting the first end surface of the laminate fixed between the table and the plate with a cutting tool while moving at least one of the two along the first end surface; and the table and the cutting tool using the second moving device And cutting the second end surface of the laminate fixed between the table and the plate with a cutting tool while moving at least one of them along the second end surface.

  In the method for manufacturing a polarizing plate according to one aspect of the present invention, the cutting tool may be an end mill.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the polarizing plate using the cutting device which can manufacture the polarizing plate which has a uniform and flat end surface and was excellent in dimensional accuracy, and the said cutting device is provided.

(A) in FIG. 1 is a schematic side view of a cutting device according to an embodiment of the present invention, and (b) in FIG. 1 is a view of the cutting device shown in (a) in FIG. It is a typical top view. (A) in FIG. 2 shows a step of cutting the first end face of the laminate using the cutting device shown in FIG. 1, and (b) in FIG. 2 uses the cutting device shown in FIG. And a step of cutting the second end face of the laminate. (A) in FIG. 3 shows a step of cutting the third end face of the laminate using the cutting device shown in FIG. 1, and (b) in FIG. 3 uses the cutting device shown in FIG. And a step of cutting the fourth end face of the laminate. (A) in FIG. 4 is a schematic top view of a cutting device according to another embodiment of the present invention, and (b) in FIG. 4 shows a cutting device according to another embodiment of the present invention. It is a typical top view. (A) in FIG. 5 is a schematic side view of a cutting apparatus having a conventional mechanical and mechanical clamp, and (b) in FIG. 5 is shown in (a) in FIG. It is a typical top view of a cutting device.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals. The present invention is not limited to the following embodiment. X, Y, and Z shown in each figure mean three coordinate axes orthogonal to each other. The direction indicated by each coordinate axis is common to all drawings.

  The manufacturing method of the polarizing plate which concerns on this embodiment cuts the process of forming the laminated body (third laminated body) containing a film-form polarizer, and the end surface of a 3rd laminated body with the cutting tool with which a cutting device is equipped. A process. As will be described in detail below, the third laminate is formed from a plurality of second laminates, and the second laminate is formed from the first laminate.

  The first laminate is formed by superposing and laminating a film-like polarizer and at least one optical film. Each of the polarizer and the optical film may have a long band shape. The optical film means a film-like member (excluding the polarizer itself) constituting the polarizing plate. The optical film may be rephrased as a layer or an optical layer. The optical film may be a protective film and a release film, for example. The first laminate may include, for example, a polarizer, a first protective film, a second protective film, a third protective film, a release film, and an adhesive layer. The first protective film may overlap with one surface of the polarizer, and the second protective film may overlap with the other surface of the polarizer. That is, the protective film may adhere to both surfaces of the polarizer. The third protective film may overlap the first protective film. That is, the first protective film may be located between the polarizer and the third protective film. The release film may overlap the second protective film through the adhesive layer. In other words, the adhesive layer may be positioned between the second protective film and the release film, and the second protective film may be positioned between the polarizer and the adhesive layer.

The first laminate is processed to form a plurality of second laminates having predetermined dimensions and shapes. For example, you may produce a 2nd laminated body by cut | disconnecting a 1st laminated body with a blade. You may produce a 2nd laminated body by the punching process of a 1st laminated body. You may produce a 2nd laminated body by cut | disconnecting a 1st laminated body with a laser. The laser may be, for example, a CO ₂ laser or an excimer laser. In the processing step, for example, the second laminate may be manufactured by combining cutting using the above-described blade, punching, and cutting using a laser.

  As shown in (a) of FIG. 1, the third stacked body 3 is formed by stacking a plurality of second stacked bodies 2. The number of the 2nd laminated bodies 2 which comprise the 3rd laminated body 3 is not limited. The 2nd laminated body 2 shown by (a) in FIG. 1 is a rectangle (thin rectangular parallelepiped). However, the shape of the 2nd laminated body 2 is not limited. The 3rd laminated body 3 shown by (a) in FIG. 1 is a rectangular parallelepiped (square pillar). However, the shape of the 3rd laminated body 3 is not limited to a square pillar. The third laminate 3 is adjacent to the first end face 3A, the second end face 3B adjacent to the first end face 3A, the third end face 3C adjacent to the second end face 3B, the third end face 3C and the first end face. 4th end surface 3D.

  The cutting tool may be a general cutting tool. The cutting tool may be at least one tool selected from the group consisting of, for example, a grinder, a luter, and a milling cutter. Multiple types of cutting tools may be used in combination. Below, the case where the end mill (endmill) which is a kind of milling machine is used as a cutting tool is demonstrated. As shown in FIGS. 1A and 1B, the cutting device 100 according to this embodiment includes a magnet clamp 4, an end mill 6, and a moving device 8.

  The magnet clamp 4 has a base 4A and a plate 4B. The plate 4B faces the flat surface of the table 4A. The magnet clamp 4 fixes the third laminated body 3 between the base 4A and the plate 4B by a magnetic force. At least one of the base 4A and the plate 4B has a magnet. For example, you may fix the 3rd laminated body 3 between the stand 4A and the board 4B with the magnetic force of the magnet which the stand 4A has. In this case, the part of the plate 4B facing the magnet of the base 4A may be a metal or a magnet. The third laminated body 3 may be fixed between the base 4A and the plate 4B by the magnetic force of the magnet of the plate 4B. In this case, the portion of the base 4A facing the magnet of the plate 4B may be a metal or a magnet. The magnet included in at least one of the base 4A and the plate 4B may be an electromagnet or a permanent magnet.

  The flat surface of the table 4A shown in FIG. 1A is a rectangle, but the shape of the surface of the table 4A is not limited. The plate 4B shown in FIGS. 1A and 1B is a thin rectangular parallelepiped, but the shape of the plate 4B is not limited.

  As shown in (a) and (b) of FIG. 1, when viewed from the stacking direction (Z-axis direction) of the third stacked body 3, the entire plate 4 </ b> B overlaps with the third stacked body 3, The laminated body 3 protrudes from between the base 4A and the plate 4B so as to surround the outer periphery of the plate 4B. That is, the surface of the plate 4B in contact with the third laminate 3 is narrower than the surface of the third laminate 3 in contact with the plate 4B, and the entire surface of the plate 4B is inside the outer periphery of the surface of the third laminate 3. Is located. Therefore, all the end surfaces (the first end surface 3A, the second end surface 3B, the third end surface 3C, and the fourth end surface 3D) of the third stacked body 3 are exposed outside the region where the third stacked body 3 and the plate 4B overlap. doing. As will be described later, the side surface 6A of the end mill 6 is pressed against each end surface (3A, 3B, 3C, 3D) of the third laminate 3 protruding from between the base 4A and the plate 4B.

  As shown in (a) and (b) of FIG. 1, when viewed from the stacking direction (Z-axis direction) of the third stacked body 3, the entire base 4 </ b> A overlaps with the third stacked body 3, The laminated body 3 protrudes from between the base 4A and the plate 4B so as to surround the outer periphery of the base 4A. That is, the surface of the base 4A in contact with the third laminate 3 is narrower than the surface of the third laminate 3 in contact with the base 4A, and the entire surface of the base 4A is inside the outer periphery of the surface of the third laminate 3. Is located. Therefore, all end surfaces (first end surface 3A, second end surface 3B, third end surface 3C, and fourth end surface 3D) of the third stacked body 3 are exposed outside the region where the third stacked body 3 and the base 4A overlap. doing. However, the surface of the base 4A in contact with the third laminate 3 may be wider than the surface of the third laminate 3 in contact with the base 4A, and the entire surface of the third laminate 3 is inside the outer periphery of the surface of the base 4A. You may be located in

  The moving device 8 includes a first moving device 8A, a second moving device 8B, and a control unit 8C. The first moving device 8A may be a device including a first guide rail, for example. The second moving device 8B may be a device including a second guide rail, for example. The first guide rail may be arranged perpendicular to the second guide rail. The first guide rail may not be arranged perpendicular to the second guide rail.

  The first moving device 8 </ b> A moves the end mill 6 along the first end surface 3 </ b> A of the third stacked body 3. The third laminated body 3 is a rectangular parallelepiped, and the third end face 3C is parallel to the first end face 3A. Therefore, it can be said that the first moving device 8 </ b> A moves the end mill 6 along the third end surface 3 </ b> C of the third stacked body 3. The mechanism (output device of the control unit 8C) that the first moving device 8A drives the end mill 6 may be, for example, a three-phase motor, a DC motor, an AC motor, a stepping motor, a servo motor, an air cylinder, or a hydraulic cylinder. .

  The second moving device 8 </ b> B moves the base 4 </ b> A along the second end surface 3 </ b> B of the third stacked body 3. The third laminated body 3 is a rectangular parallelepiped, and the second end face 3B is parallel to the fourth end face 3D. Therefore, it can be said that the second moving device 8 </ b> B moves the base 4 </ b> A along the fourth end surface 3 </ b> D of the third stacked body 3. As above-mentioned, the board 4B and the 3rd laminated body 3 are being fixed on the surface of the base 4A with the magnetic force. Therefore, the plate 4B and the third laminate 3 move together with the stand 4A while the relative positional relationship between the stand 4A, the plate 4B and the third laminate 3 is fixed. The mechanism (the output device of the control unit 8C) for driving the base 4A by the second moving device 8B may be, for example, a three-phase motor, a DC motor, an AC motor, a stepping motor, a servo motor, an air cylinder, or a hydraulic cylinder. .

  As described above, since the third stacked body 3 is a rectangular parallelepiped, the first end face 3A is perpendicular to the second end face 3B adjacent to the first end face 3A. Accordingly, the direction along the first end surface 3A is perpendicular to the direction along the second end surface 3B. In other words, the direction in which the end mill 6 moves by the first moving device 8A is perpendicular to the direction in which the platform 4A moves by the second moving device 8B.

  The controller 8C operates the first moving device 8A by sequence control to freely adjust the position and speed of the end mill 6 at an arbitrary time point. In addition, the control unit 8C operates the second moving device 8B by sequence control to freely adjust the position and speed of the table 4A at an arbitrary time point. Therefore, the control unit 8C can freely adjust the position, speed, and movement path of the end mill 6 and the base 4A in a plane (XY plane) perpendicular to the stacking direction of the third stacked body 3. In other words, the control unit 8 </ b> C can freely move the end mill 6 along the entire end surface of the third stacked body 3. The control unit 8C may be a programmable logic controller (Programmable Logic Controller). That is, any control content related to the end mill 6 and the platform 4A may be input in advance to the input device (computer) of the control unit 8C as a program, and sequence control may be performed by sequentially executing the program.

  The end mill 6 is a kind of milling cutter. The end mill 6 rotates about a rotation axis parallel to the stacking direction (Z-axis direction) of the third stacked body 3. When the end mill 6 is rotated, the blades located on the side surface 6A substantially parallel to the rotation axis cut each end surface of the third laminate 3. By cutting each end face of the third laminate 3 with the end mill 6, the end face of the third laminate 3 is finished uniformly and smoothly, and a plurality of second laminates 2 (that is, polarizing plates) constituting the third laminate 3. ) Are adjusted uniformly and with high accuracy. A series of steps of cutting all end faces of the third laminate 3 with the end mill 6 is as follows.

  As shown in FIG. 1A, the third laminate 3 is fixed between the base 4A and the plate 4B, and the position of the base 4A is fixed by the second moving device 8B. That is, the positions of the base 4A, the plate 4B, and the third laminate 3 are fixed. Then, as shown in FIG. 2A, the rotating end mill 6 is placed on one end of the first end surface 3 </ b> A while the side surface 6 </ b> A of the end mill 6 is parallel to the first end surface 3 </ b> A of the third laminate 3. To the other end. As a result, the entire first end surface 3 </ b> A of the third laminate 3 is cut by the end mill 6. As described above, when cutting the first end surface 3A of the third laminate 3, the moving direction of the end mill 6 is the direction d6 along the first end surface 3A, and the moving distance of the end mill 6 is the first distance in the direction d6. It is almost the same as the entire width of the end face 3A.

  After cutting the entire first end surface 3A, the position of the end mill 6 is adjusted so that the side surface 6A of the end mill 6 faces parallel to one end of the second end surface 3B of the third laminate 3. Fixed by. Then, as shown in FIG. 2 (b), the table 4 </ b> A is moved along the second end surface 3 </ b> B, and the other end of the second end surface 3 </ b> B reaches the end mill 6. As a result, the entire second end surface 3B of the third laminate 3 is cut by the end mill 6. As mentioned above, when cutting the 2nd end surface 3B of the 3rd laminated body 3, the moving direction of the base 4A, the board 4B, and the 3rd laminated body 3 is the direction d4 along the 2nd end surface 3B, The moving distances of 4A, the plate 4B, and the third laminate 3 are substantially the same as the entire width of the second end face 3B in the direction d4.

  After cutting the entire second end surface 3B, the position of the base 4A is set so that the side surface 6A of the end mill 6 faces parallel to one end portion of the third end surface 3C of the third laminate 3. Fixed by. That is, the positions of the base 4A, the plate 4B, and the third laminate 3 are fixed. Then, as shown in FIG. 3A, the rotating end mill 6 is placed on one end of the third end face 3C while the side face 6A of the end mill 6 is applied in parallel to the third end face 3C of the third laminate 3. To the other end. As a result, the entire third end surface 3 </ b> C of the third laminate 3 is cut by the end mill 6. As described above, when the third end face 3C of the third laminate 3 is cut, the moving direction of the end mill 6 is the direction (−d6) along the third end face 3C, and the moving distance of the end mill 6 is the direction ( -D6) is substantially the same as the entire width of the third end face 3C.

  After cutting the entire third end surface 3C, the position of the end mill 6 is moved to the first moving device 8A so that the side surface 6A of the end mill 6 faces parallel to one end of the fourth end surface 3D of the third laminate 3. Fixed by. And as FIG.3 (b) shows, the base 4A is moved along the 2nd end surface 3B, and the other edge part of 4th end surface 3D reaches | attains the end mill 6. FIG. As a result, the entire fourth end surface 3D of the third laminate 3 is cut by the end mill 6. As mentioned above, when cutting 4th end surface 3D of the 3rd laminated body 3, the moving direction of the base 4A, the board 4B, and the 3rd laminated body 3 is a direction (-d4) along 4th end surface 3D. Yes, the movement distances of the base 4A, the plate 4B, and the third laminate 3 are substantially the same as the width of the entire fourth end surface 3D in the direction (-d4).

  Through the above series of steps, the cutting of all end faces of the third laminate 3 is completed. Each of the plurality of second laminates 2 constituting the third laminate 3 with all end faces cut corresponds to the polarizing plate itself. The laminated structure of the polarizing plate is the same as the laminated structure of the first laminated body used for the production of the second laminated body 2, and is the same as the laminated structure of the second laminated body 2. That is, the polarizing plate may include a first protective film, a second protective film, a third protective film, a release film, and an adhesive layer. The first protective film may overlap with one surface of the polarizer, and the second protective film may overlap with the other surface of the polarizer. The third protective film may overlap the first protective film. The release film may overlap the second protective film through the adhesive layer.

  When the third laminate 3 is mechanically and mechanically fixed using a clamp that does not have a magnetic force (non-magnetic clamp), there are the following problems. The cutting device 200 shown in FIG. 5A includes a nonmagnetic clamp 50 instead of the magnet clamp 4. The moving device 8 included in the cutting device 200 includes a first moving device 8A, a second moving device 8B, and a control unit 8C. The first moving device 8 </ b> A moves the end mill 6 along the first end surface 3 </ b> A of the third stacked body 3. The second moving device 8 </ b> B moves the end mill 6 along the second end surface 3 </ b> B of the third stacked body 3. The first moving device 8 </ b> A may move the second moving device 8 </ b> B together with the end mill 6 along the first end surface 3 </ b> A of the third stacked body 3. Alternatively, the second moving device 8 </ b> B may move the first moving device 8 </ b> A along with the end mill 6 along the second end surface 3 </ b> B of the third stacked body 3. The non-magnetic clamp 50 includes plate-like first holder 50A and second holder 50B facing each other, a first shaft portion 50C joined perpendicularly to the first holder 50A, and a first joint joined perpendicularly to the second holder 50B. Biaxial part 50D. The third laminate 3 is sandwiched and fixed by the first holder 50A and the second holder 50B. In order to fasten the third laminated body 3 with the first holder 50A and the second holder 50B, the first shaft portion 50C and the second shaft portion 50D are essential in terms of structure. In order to sequentially move the end mill 6 along the four end faces (3A, 3B, 3C and 3D) of the third laminate 3, at least one of the first moving device 8A and the second moving device 8B is used. Must move with. For example, the second moving device 8B must move together with the end mill 6 by the first moving device 8A. Alternatively, the first moving device 8A together with the end mill 6 must be moved by the second moving device 8B. However, both the first moving device 8A and the second moving device 8B come into contact with the first shaft portion 50C in the process of moving in the plane perpendicular to the stacking direction of the third stacked body 3 (in the XY plane). End up. In other words, the nonmagnetic clamp 50 (first shaft portion 50C) physically interferes with the moving device 8 and prevents free movement of the moving device 8 and the end mill 6. As a result, the end mill 6 cannot be moved sequentially along the four end surfaces (3A, 3B, 3C, and 3D) of the third laminate 3.

  By disposing a plurality of end mills and their moving devices around the third laminate 3, physical interference between the nonmagnetic clamp 50 (first shaft portion 50C) and the moving device can be avoided. . For example, the entire end surface of the third laminate 3 may be divided into a plurality of regions, and one end mill may be disposed for each region. However, when the end surface of the third laminate 3 is cut with a plurality of end mills, the end surface is difficult to cut uniformly. As a result, seams (streaky marks) are likely to be formed on the end face of the finally obtained polarizing plate, and the shape and dimensions of the polarizing plate are likely to vary.

  On the other hand, in this embodiment, since the third laminated body 3 is fixed between the base 4A and the plate 4B by magnetic force, neither the first shaft portion 50C nor the second shaft portion 50D is necessary because of the clamping mechanism. That is, the magnet clamp 4 does not need to include either the first shaft portion 50C or the second shaft portion 50D. Therefore, the magnet clamp 4 does not physically interfere with any of the first moving device 8A and the second moving device 8B, and one end mill 6 has all the end surfaces (3A, 3B, 3C and 3D) of the third laminate 3. ) In order. That is, since the magnet clamp 4 is disposed so as not to interfere with the moving device 8, it is not necessary to use a plurality of end mills in combination. Therefore, all the end surfaces of the third laminated body 3 can be continuously and seamlessly cut using one end mill 6. As a result, all end faces of the third laminate 3 are finished uniformly and smoothly, and the shapes and dimensions of the plurality of second laminates 2 (that is, polarizing plates) constituting the third laminate 3 are uniform and highly accurate. It is adjusted with.

  In the cutting device 200 shown in FIGS. 5A and 5B, when the entire nonmagnetic clamp 50 to which the third laminate 3 is fixed can be rotated, the nonmagnetic clamp 50 and the moving device Physical interference with 8 can be avoided. That is, by rotating the entire nonmagnetic clamp 50 with respect to the rotation axis parallel to the first shaft portion 50C and the second shaft portion 50D, an arbitrary end surface of the third stacked body 3 is brought to the side surface 6A of the end mill 6. Can be directed parallel. Therefore, by rotating the third laminated body 3 and switching the end face of the third laminated body 3 facing the end mill 6, each end face can be sequentially cut by one end mill 6. However, as shown in FIG. 5B, when the nonmagnetic clamp 50 rotates, the third laminate 3 is easily distorted. For example, due to the rotation of the nonmagnetic clamp 50, the end surface of the third stacked body 3 is not flat. For example, the end surface is curved or uneven. Alternatively, the end surface of the third laminated body 3 may be inclined with respect to the side surface 6 </ b> A of the end mill 6 by the rotation of the nonmagnetic clamp 50. As described above, the end surface of the distorted third laminate 3 is difficult to cut uniformly, and the shapes and dimensions of the plurality of second laminates 2 (that is, polarizing plates) constituting the third laminate 3 are likely to vary. On the other hand, in this embodiment, since the magnet clamp 4 does not physically interfere with the moving device 8, it is not necessary to rotate the magnet clamp 4 and the third stacked body 3, and the distortion of the third stacked body 3 is suppressed. Therefore, it becomes possible to cut the flat end surface of the 3rd laminated body 3 uniformly, and the precision of the shape and dimension of a polarizing plate improves.

  The polarizer may be a film-like polyvinyl alcohol resin (PVA film) produced by processes such as stretching, dyeing, and crosslinking. Details of the polarizer are as follows.

  For example, first, a PVA film is stretched in a uniaxial direction or a biaxial direction. The dichroic ratio of the uniaxially stretched polarizer tends to be high. Following stretching, the PVA film is dyed with iodine, a dichroic dye (polyiodine) or an organic dye using a dyeing solution. The staining liquid may contain boric acid, zinc sulfate, or zinc chloride. The PVA film may be washed with water before dyeing. By washing with water, dirt and an antiblocking agent are removed from the surface of the PVA film. In addition, as a result of swelling of the PVA film by washing with water, staining spots (non-uniform staining) are easily suppressed. The dyed PVA film is treated with a solution of a crosslinking agent (for example, an aqueous solution of boric acid) for crosslinking. After the treatment with the crosslinking agent, the PVA film is washed with water and subsequently dried. A polarizer is obtained through the above procedure. The polyvinyl alcohol resin can be obtained by saponifying a polyvinyl acetate resin. The polyvinyl acetate resin is, for example, polyvinyl acetate, which is a homopolymer of vinyl acetate, or a copolymer of vinyl acetate and another monomer (for example, ethylene-vinyl acetate copolymer). Good. Other monomers that copolymerize with vinyl acetate may be unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, or acrylamides with ammonium groups in addition to ethylene. The polyvinyl alcohol-based resin may be modified with aldehydes. The modified polyvinyl alcohol resin may be, for example, partially formalized polyvinyl alcohol, polyvinyl acetal, or polyvinyl butyral. The polyvinyl alcohol resin may be a polyene oriented film such as a dehydrated polyvinyl alcohol product or a dehydrochlorinated polyvinyl chloride product. Dyeing may be performed before stretching, or stretching may be performed in a dyeing solution. The length of the stretched polarizer may be, for example, 3 to 7 times the length before stretching.

  The thickness of the polarizer may be, for example, 1 μm or more and 50 μm or less. The vertical width and the horizontal width of the polarizing plate may be, for example, 30 mm or more and 600 mm or less. The thickness of the polarizing plate (the thickness of the second laminate 2) may be, for example, 10 μm or more and 1200 μm or less.

  The first protective film and the second protective film may be any thermoplastic resin having translucency, and may be an optically transparent thermoplastic resin. Examples of the resin constituting the first protective film and the second protective film include a chain polyolefin resin, a cyclic olefin polymer resin (COP resin), a cellulose ester resin, a polyester resin, a polycarbonate resin, and (meth). It may be an acrylic resin, a polystyrene resin, or a mixture or copolymer thereof. The composition of the first protective film may be exactly the same as the composition of the second protective film. The composition of the first protective film may be different from the composition of the second protective film.

  The chain polyolefin resin may be, for example, a homopolymer of a chain olefin such as a polyethylene resin or a polypropylene resin. The chain polyolefin resin may be a copolymer composed of two or more chain olefins.

  The cyclic olefin polymer resin (cyclic polyolefin resin) may be, for example, a cyclic olefin ring-opening (co) polymer or a cyclic olefin addition polymer. The cyclic olefin polymer-based resin may be, for example, a copolymer of a cyclic olefin and a chain olefin (for example, a random copolymer). The chain olefin constituting the copolymer may be, for example, ethylene or propylene. The cyclic olefin polymer-based resin may be a graft polymer obtained by modifying the above polymer with an unsaturated carboxylic acid or a derivative thereof, or a hydride thereof. The cyclic olefin polymer resin may be, for example, a norbornene resin using a norbornene monomer such as norbornene or a polycyclic norbornene monomer.

  The cellulose ester resin may be, for example, cellulose triacetate (triacetyl cellulose (TAC)), cellulose diacetate, cellulose tripropionate, or cellulose dipropionate. These copolymers may be used. A cellulose ester resin in which a part of the hydroxyl group is modified with another substituent may be used.

  Polyester resins other than cellulose ester resins may be used. The polyester resin may be, for example, a polycondensate of a polyvalent carboxylic acid or derivative thereof and a polyhydric alcohol. The polyvalent carboxylic acid or derivative thereof may be a dicarboxylic acid or derivative thereof. The polyvalent carboxylic acid or derivative thereof may be, for example, terephthalic acid, isophthalic acid, dimethyl terephthalate, or dimethyl naphthalenedicarboxylate. The polyhydric alcohol may be, for example, a diol. The polyhydric alcohol may be, for example, ethylene glycol, propanediol, butanediol, neopentyl glycol, or cyclohexanedimethanol.

  The polyester resin may be, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexane dimethyl terephthalate, or polycyclohexane dimethyl naphthalate. .

  The polycarbonate-based resin is a polymer in which polymerized units (monomers) are bonded via a carbonate group. The polycarbonate resin may be a modified polycarbonate having a modified polymer skeleton, or may be a copolymerized polycarbonate.

  (Meth) acrylic resin is, for example, poly (meth) acrylic acid ester (for example, polymethyl methacrylate (PMMA)); methyl methacrylate- (meth) acrylic acid copolymer; methyl methacrylate- (meth) acrylic Acid ester copolymer; methyl methacrylate-acrylic ester- (meth) acrylic acid copolymer; (meth) methyl acrylate-styrene copolymer (for example, MS resin); methyl methacrylate and alicyclic hydrocarbon It may be a copolymer with a compound having a group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer, methyl methacrylate-norbornyl copolymer (meth) acrylate).

  The first protective film or the second protective film is at least one additive selected from the group consisting of a lubricant, a plasticizer, a dispersant, a heat stabilizer, an ultraviolet absorber, an infrared absorber, an antistatic agent, and an antioxidant. May be included.

  The thickness of the first protective film may be, for example, 5 μm or more and 90 μm or less. The thickness of the second protective film may also be, for example, 5 μm or more and 90 μm or less.

  The first protective film or the second protective film may be a film having an optical function, such as a retardation film or a brightness enhancement film. For example, a retardation film to which an arbitrary retardation value is given can be obtained by stretching a film made of the thermoplastic resin or forming a liquid crystal layer or the like on the film.

  The first protective film may be bonded to the polarizer via an adhesive layer. The second protective film may also be bonded to the polarizer via the adhesive layer. The adhesive layer may contain an aqueous adhesive such as polyvinyl alcohol, and may contain an active energy ray-curable resin described later.

  The active energy ray-curable resin is a resin that cures when irradiated with active energy rays. The active energy ray may be, for example, ultraviolet light, visible light, electron beam, or X-ray. The active energy ray curable resin may be an ultraviolet curable resin.

  The active energy ray-curable resin may be a kind of resin and may include a plurality of kinds of resins. For example, the active energy ray curable resin may contain a cationic polymerizable curable compound or a radical polymerizable curable compound. The active energy ray curable resin may contain a cationic polymerization initiator or a radical polymerization initiator for initiating a curing reaction of the curable compound.

  The cationically polymerizable curable compound may be, for example, an epoxy compound (a compound having at least one epoxy group in the molecule) or an oxetane compound (a compound having at least one oxetane ring in the molecule). The radical polymerizable curable compound may be, for example, a (meth) acrylic compound (a compound having at least one (meth) acryloyloxy group in the molecule). The radical polymerizable curable compound may be a vinyl compound having a radical polymerizable double bond.

  The active energy ray curable resin may be a cationic polymerization accelerator, an ion trapping agent, an antioxidant, a chain transfer agent, a tackifier, a thermoplastic resin, a filler, a flow regulator, a plasticizer, or an antifoaming agent, if necessary. Agents, antistatic agents, leveling agents, or solvents.

  The pressure-sensitive adhesive layer may include, for example, a pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, or a urethane-based pressure-sensitive adhesive. The thickness of the adhesive layer may be, for example, 2 μm or more and 500 μm or less.

  Resin which comprises a 3rd protective film may be the same as said resin enumerated as resin which comprises a 1st protective film or a 2nd protective film. The thickness of the third protective film may be, for example, 5 μm or more and 200 μm or less.

  Resin which comprises a release film may be the same as said resin enumerated as resin which comprises a 1st protective film or a 2nd protective film. The thickness of the release film may be, for example, 5 μm or more and 200 μm or less.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment at all.

  The moving device may move only the end mill along all the end faces of the laminate. For example, as shown in FIG. 4A, the moving device 8 provided in the cutting device 100A may move only the end mill 6, and the position of the magnet clamp 4 (base 4A) may be fixed. That is, the first moving device 8 </ b> A moves the end mill 6 along the first end surface 3 </ b> A and the third end surface 3 </ b> C of the third stacked body 3. The second moving device 8B moves the end mill 6 along the second end surface 3B and the fourth end surface 3D of the third laminate 3. The first moving device 8A may move the second moving device 8B together with the end mill 6 along the first end surface 3A and the third end surface 3C of the third laminate 3. Alternatively, the second moving device 8B may move the first moving device 8A along with the end mill 6 along the second end surface 3B and the fourth end surface 3D of the third laminate 3.

  The moving device may move only the base (magnet clamp) along all the end faces of the laminate. For example, as shown in FIG. 4B, the moving device 8 provided in the cutting device 100B may move only the base 4A (magnet clamp 4), and the position of the end mill 6 may be fixed. That is, the first moving device 8A moves the base 4A along the first end surface 3A and the third end surface 3C of the third stacked body 3. The second moving device 8B moves the table 4A along the second end surface 3B and the fourth end surface 3D of the third stacked body 3. The first moving device 8A may move the second moving device 8B together with the base 4A along the first end surface 3A and the third end surface 3C of the third stacked body 3. Alternatively, the second moving device 8B may move the first moving device 8A along with the stage 4A along the second end surface 3B and the fourth end surface 3D of the third stacked body 3.

  The moving device 8 may include another moving device in addition to the first moving device 8A and the second moving device 8B. For example, the moving device 8 may further include a third moving device that moves at least one of the table 4A and the end mill 6 along the stacking direction (Z-axis direction) of the third stacked body 3. One moving device 8 may surround the base 4A (magnet clamp 4). In other words, the moving path of the end mill 6 or the table 4A may be a closed ring surrounding the table 4A.

  The first end surface 3A of the third stacked body 3 may not be perpendicular to the second end surface 3B of the third stacked body 3. The first end surface 3 </ b> A of the third stacked body 3 may not be parallel to the third end surface 3 </ b> C of the third stacked body 3. The second end surface 3B of the third stacked body 3 may not be parallel to the fourth end surface 3D of the third stacked body 3.

  The shape of the 3rd laminated body 3 is not limited. The third laminated body 3 may be a polygonal column other than a square column. That is, the shape of the third stacked body 3 in the direction (XY plane direction) parallel to the stacking direction (Z-axis direction) of the third stacked body 3 may be a polygon other than a quadrangle. The third laminated body 3 may be a cylinder or an elliptic cylinder. That is, the shape of the third laminated body 3 in the direction parallel to the third laminated body 3 may be a circle or an ellipse. You may form the 3rd laminated body 3 by superimposing the several 2nd laminated body in which the notch part was formed. The shape of the notch formed in the second laminate may be, for example, a polygon such as a triangle or a quadrangle, and may be a semicircle or a semi-ellipse.

  The shape of the flat surface of the table 4A is not limited to a quadrangle. The shape of the surface of the table 4 </ b> A may be similar to the shape of the third stacked body 3 in a direction parallel to the stacking direction of the third stacked body 3. For example, the shape of the surface of the base 4A may be a polygon other than a square, a circle, or an ellipse. The shape of the plate 4B is not limited to a rectangular parallelepiped. The shape of the plate 4B in the direction parallel to the surface of the table 4A may be similar to the shape of the third stacked body 3 in the direction parallel to the stacking direction of the third stacked body 3. For example, the shape of the plate 4B may be a polygon other than a square, a circle, or an ellipse.

  The end mill 6 or the table 4 </ b> A may move parallel to each end surface of the third stacked body 3. The end mill 6 or the base 4A may not move in parallel with respect to each end face of the third laminate 3. For example, the end mill 6 or the base 4 </ b> A may be moved in a direction that is not parallel to any end face of the third laminate 3 to form a notch on any end face of the third laminate 3.

  The shape of the finally obtained polarizing plate is not limited to a quadrangle. The shape of the polarizing plate may be rephrased as the shape of the light receiving surface of the polarizing plate. The shape of the polarizing plate may be a polygon other than a rectangle, a circle, or an ellipse. The notch part may be formed in the polarizing plate. The shape of the notch formed in the polarizing plate may be, for example, a polygon such as a triangle or a quadrangle, and may be a semicircle or a semi-ellipse. The shape of the finally obtained polarizing plate may be different from the shape of each second laminated body 2 constituting the third laminated body 3. That is, the shape of the polarizing plate may be different from the shape of the third stacked body 3 in the direction parallel to the stacking direction of the third stacked body 3.

  You may cut the end surface of a 1st laminated body using the cutting device which concerns on this invention. You may cut the end surface of a 2nd laminated body using the cutting device which concerns on this invention.

  The number of optical films provided in the polarizing plate (optical film overlapping the polarizer) is not limited. The number of optical films included in the polarizing plate may be one. For example, the polarizing plate may not include any one of the first protective film and the second protective film.

  The release film may be arrange | positioned on both surfaces of the polarizing plate through the adhesion layer.

  The optical film included in the polarizing plate is a reflective polarizing film, a film with antiglare function, a film with antireflection function, a reflective film, a transflective film, a viewing angle compensation film, an optical compensation layer, a hard coat layer, and a touch sensor layer. Further, it may be an antistatic layer or an antifouling layer. The chamfered corner may belong to any of these optical films.

  The polarizing plate manufactured using the cutting device according to the present invention is attached to, for example, a liquid crystal cell or an organic EL device, and is an image display device (liquid crystal display device or organic EL device) such as a liquid crystal television, an organic EL television, or a smartphone. It is applied as an optical component constituting a display device or the like.

  2 ... 2nd laminate, 3 ... 3rd laminate, 3A ... 1st end surface of 3rd laminate, 3B ... 2nd end surface of 3rd laminate, 3C ... 3rd end surface of 3rd laminate, 3D ... 1st Fourth end surface of three laminates, 100, 100A, 100B ... cutting device, 200 ... cutting device with non-magnetic clamp, 4 ... magnet clamp, 4A ... stand, 4B ... plate, 6 ... end mill (cutting tool), 6A ... side face of end mill, 8 ... moving device, 8A ... first moving device, 8B ... second moving device, 8C ... control unit, 50 ... non-magnetic clamp, 50A ... first holder, 50B ... second holder, 50C ... 1st axial part, 50D ... 2nd axial part.

Claims (6)

A magnet clamp that includes a table and a plate facing the surface of the table, and fixes a laminate including a film-like polarizer between the table and the plate by a magnetic force;
A cutting tool for cutting an end face of the laminate,
A moving device that moves at least one of the table and the cutting tool along the end surface; and
Comprising
Cutting equipment. The laminate is a quadrangular prism having a first end surface and a second end surface adjacent to the first end surface;
The mobile device is
A first moving device for moving at least one of the table and the cutting tool along the first end surface;
A second moving device for moving at least one of the table and the cutting tool along the second end surface;
including,
The cutting device according to claim 1. The cutting tool is an end mill;
The cutting device according to claim 1 or 2. A method for producing a polarizing plate using the cutting device according to claim 1,
Forming the laminate;
The end surface of the laminate fixed between the table and the plate is cut with the cutting tool while moving at least one of the table and the cutting tool along the end surface using the moving device. And a process of
Comprising
Manufacturing method of polarizing plate. A method for producing a polarizing plate using the cutting device according to claim 2,
Forming the laminate;
While moving at least one of the table and the cutting tool along the first end surface using the first moving device, the first end surface of the laminate fixed between the table and the plate Cutting with the cutting tool;
The second end surface of the laminate fixed between the table and the plate while moving at least one of the table and the cutting tool along the second end surface using the second moving device. Cutting with the cutting tool,
Comprising
Manufacturing method of polarizing plate. The cutting tool is an end mill;
The manufacturing method of the polarizing plate of Claim 4 or 5.

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