JP5261681B2 - Method for cutting laminated film having optical film and method for producing optical display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of cutting a multilayer film comprising an optical film that does not cause delamination. <P>SOLUTION: In the method of cutting the multilayer film comprising an optical film, the multilayer film is cut by using a blade having an edge in a double edge form and moving the blade in the state with the blade fixed at a cutting angle of the blade to the surface of the film as the cutting object is less than 10&deg;, thereby pulling the blade to cut the film. The optical film is a polarizing plate comprising a polarizer and a polarizer protecting film laminated on at least one side of the polarizer, and, in this method, the polarizing plate is cut in the widthwise direction of the polarizing plate. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a method for cutting a laminated film having an optical film, and a method for manufacturing an optical display device using the cutting method.

  An example of a laminated film having an optical film is a polarizing plate. The polarizing plate is used in many scenes as a constituent member of a liquid crystal display device (hereinafter, abbreviated as LCD), and in recent years, the demand for the polarizing plate is rapidly increasing. In addition, the use of high-value-added polarizing plates having an optical compensation function and a brightness enhancement function is increasing, and the demand for display quality tends to increase further.

  In general, a polarizing plate is cut from a raw sheet of a long sheet into a predetermined shape and size and mounted on an LCD panel. In the raw sheet of this long sheet, a separator is laminated via an adhesive layer in addition to the polarizing plate. Then, in the cutting process, the polarizing plate and the pressure-sensitive adhesive layer are cut to a predetermined size without cutting the separator (this cutting is called a half cut), and the polarizing plate is cut to the predetermined size while peeling the separator. There is known a method of continuously bonding a film to a panel via an adhesive layer (Patent Document 1). In Patent Document 1, half cutting is performed by a laser, but other cutting means have been studied from the viewpoint of apparatus cost and maintenance load.

  As a polarizing plate cutting process, a vertical cutting method such as push cutting is known. However, in this method, the angle of approach of the cutting blade to the surface of the polarizing plate is 90 °, and the polarizing plate is cut while being crushed. Therefore, delamination occurs due to the cutting stress acting at the time of cutting, and the quality of the cut surface is improved. There is a problem of lowering. Here, “delamination” refers to a partial peeling phenomenon at a cut surface between a polarizer and a polarizer protective film laminated via an adhesive.

  By the way, as described in Patent Document 2, there is known a half-cut method in which a laminated sheet (soft plastic layer) is cut without cutting the laminated sheet support. This is a method of cutting the soft plastic layer by pressing the cutter blade against the laminated sheet and cutting it while conveying the laminated sheet to leave the support. The cutter blade is configured to cut at a cutting angle of 10 to 90 ° with respect to the laminated sheet surface. However, in order to half-cut the polarizing plate having a separator without cutting the separator, if a cutter blade is used as in Patent Document 2 and the cutter blade is half-cut at a cutting angle of 10 to 90 °, delamination occurs. Therefore, this method cannot be employed as it is, and does not suggest a solution means for eliminating the delamination of the polarizing plate with respect to the method for cutting a laminated film having an optical film.

  Further, as described in Patent Document 3, there is known an apparatus that half-cuts a film while fixing a disk cutter, and is capable of adjusting the cutting amount of the disk cutter with respect to the film. However, the present invention discloses a configuration that makes it possible to adjust the cutting amount of the blade edge, and does not suggest a solution for eliminating the delamination of the polarizing plate with respect to a method for cutting a laminated film having an optical film.

  Moreover, as described in Patent Document 4, a method for half-cutting a photosensitive laminate film, in which the photosensitive laminate film is half-cut using a rotating round blade and a fixed round blade, respectively. It has been known. However, on the cut surface half-cut with a fixed round blade, a photosensitive resin layer (a composition containing an alkali-soluble binder, a monomer, a photopolymerization initiator, a colorant) and a protective film (polyethylene or polypropylene) that is not a film. It discloses a configuration in which peeling is satisfactorily prevented, and does not suggest a solution for eliminating delamination of a polarizing plate with respect to a method for cutting a laminated film having an optical film.

WO2008 / 047712 JP 2002-18791 A Japanese Patent Laid-Open No. 11-179893 JP 2007-260865 A

  This invention is made | formed in view of said situation, The objective is to provide the cutting method of the laminated | multilayer film which has an optical film which does not produce delamination.

  As a result of intensive studies in order to solve the above problems, the present invention has been completed.

The cutting method of the laminated film having the optical film of the present invention,
A method for cutting a laminated film having an optical film,
The blade tip is a double-edged blade, the cutting angle of the blade with respect to the film surface to be cut is less than 10 °, and the film is cut by moving the blade in a fixed state.

  According to this structure, only the laminated film is cut from the laminated film with a separator obtained by laminating the separator on the laminated film, and the separator is not cut. Since the cutting angle of the blade with respect to is less than 10 ° and the blade is moved without moving the blade while moving the both blades to draw the film, there is no delamination on the cut surface of the cut film layer. . Moreover, the crack in the cut | disconnected film member does not arise. Here, “cut” means a state in which individual film members are completely divided, and does not include a cut in a state where the film members are not completely divided. Therefore, “not cutting the separator” includes a state in which the separator is cut by the blade. Examples of the “blade” include a flat blade, a round blade, a polygonal blade, and the like. What is important in the present invention is that the cutting angle of the blade with respect to the film surface is less than 10 °.

  Similarly, when the laminated film is divided in the thickness direction including the separator (this kind of cutting is referred to as full cut), the cutting edge of the blade with respect to the surface of the film to be cut is similarly used using a double-edged blade. Is less than 10 °, and the blade is moved in a fixed state to cut the film, so that delamination on the cut surface of the cut film layer does not occur. Moreover, the crack in the cut | disconnected film member does not arise.

  Moreover, as one Embodiment of this invention, the said blade is comprised with a round blade.

According to this structure, delamination generation | occurrence | production can be favorably suppressed by fixing a round blade and drawing a film. The cutting angle D in the case of a round blade is set by FIG. 1 and the following formula.
(Formula 1) D = cos ⁻¹ (C / √ (C ² + B ² )) (1)
(In Formula 1, D is the cutting angle, C is the cutting width, B is the cutting thickness (in the case of a half cut) or the amount of both penetrations (in the case of a full cut))
(Formula 2) C = √ (r ² − (r−B) ² ) (2)
(In Equation 2, r is the radius of the outer shape of the round blade)

  Moreover, as one Embodiment of this invention, there exists a structure which rotates the said fixed round blade at predetermined timings other than the time of a cutting | disconnection, and changes the blade-tip position for a cutting | disconnection.

  According to this configuration, when the cutting edge of the round blade is damaged, worn, etc., the round blade can be rotated by a predetermined angle, fixed, and set to a new cutting edge, so that the cutting accuracy can be maintained, There is no work to remove like a flat blade, the blade tip can be easily replaced, and the working time can be shortened effectively. To replace the blade edge, the image of the blade edge imaged by the imaging means is processed, and it is determined whether or not the blade edge is damaged or worn. If it is determined that the edge is damaged or worn, the round blade is released. And the structure which is rotated a predetermined angle and fixed again is illustrated. In addition, the timing can be notified by display, sound, etc., and the operator can manually replace the blade edge. As another timing, the number of times of cutting may be counted and the count may reach a predetermined value (for example, 5000 times, 10000 times, etc.).

  Moreover, as one embodiment of the present invention, the optical film is a polarizing plate having a polarizer and a polarizer protective film laminated on at least one surface of the polarizer, and the polarizing film in the width direction of the polarizing plate. There is a configuration for cutting a plate. Furthermore, it is exemplified that a protective film for protecting the surface is laminated to constitute a laminated film, and a separator that is peeled off when being bonded to an optical display unit such as a liquid crystal panel is laminated on the polarizing plate. According to this invention, the delamination between a polarizer and a polarizer protective film is suppressed suitably.

In another aspect of the present invention, the laminated film and the pressure-sensitive adhesive layer are cut from the laminated film with the separator formed by laminating the separator on the laminated film having the optical film, leaving the separator and the cut. A method of manufacturing an optical display device by laminating a laminated film to an optical display unit via the pressure-sensitive adhesive layer,
It has the process of cut | disconnecting a laminated | multilayer film and an adhesive layer using the cutting method of any one of the said Claim 1 to 4.

  According to this configuration, a laminated film (polarizing plate, or polarizing plate and protective film) is optically displayed from the laminated film with a separator that has been half-cut using the above-described cutting method (without cutting). The optical display device can be suitably manufactured. For example, a long polarizing plate with a separator is half-cut to cut the polarizing plate and the pressure-sensitive adhesive layer while leaving the separator, and the polarizing plate having a predetermined size after cutting is applied to the optical display unit via the pressure-sensitive adhesive layer. In the bonding process, the separator is peeled off from the half-cut polarizing plate with a separator, and the cut polarizing plate is bonded to the optical display unit. According to this configuration, since a polarizing plate having no delamination on the cut surface can be provided in the optical display unit, a high-quality optical display device can be provided. As a manufacturing method of this optical display device, a laminated film (for example, a polarizing plate) cut by half-cutting continuously leaving a separator while supplying a laminated film with a separator of a raw roll is used as an optical display unit. Examples of the manufacturing method to be bonded include a manufacturing method such as Japanese Patent Application Laid-Open No. 2005-37416 and International Application WO 2008/047712.

Diagram for explaining the cutting angle of a round blade The figure for demonstrating a cutting device A photograph of the delamination of the polarizing plate

  FIG. 1 is a diagram for explaining a cutting angle at the time of half-cutting. In addition, the cutting angle at the time of a full cut can be demonstrated similarly. FIG. 2 is a diagram for explaining the cutting device. First, the cutting device 1 of FIG. 2 will be described.

  The separator-attached laminated film F that is long in the L direction has a separator F2 (release film) laminated on one surface of the polarizing plate F1 via an adhesive layer F3 and a surface protection on the other side via an adhesive layer F5. A film F4 is laminated. Although not shown, the polarizing plate F1 has a structure in which a polarizer and a polarizer protective film are bonded to each other by an adhesive.

  The cutting device 1 includes a round blade 10 having a double-edged blade edge and a moving mechanism 12 configured to reciprocate the round blade 10 in a cutting movement direction M (broken arrow in FIG. 2). The round blade 10 is configured to be fixed without being rotated during the half cut. In addition, the cutting device 1 is provided with a separator in accordance with the cutting thickness B in order to set a cutting thickness B that is a distance at which the cutting edge 101 of the round blade 10 enters and cuts from the surface of the laminated film F with separator. It is comprised so that the installation distance of the round blade 10 from the surface of the laminated | multilayer film F can be set. For example, the moving mechanism 12 can be configured to be vertically movable and fixed with respect to the surface of the laminated film F with separator, or only the round blade 10 can be configured to be vertically moved and fixed with respect to the surface of the laminated film F with separator.

  On the opposite side of the cutting apparatus 1 with the separator-attached laminated film F interposed therebetween, a cutting receiving plate 20 having an adsorption mechanism for holding the surface of the separator-attached laminated film F flat when the round blade 10 is cut is provided. It has been. When the separator-attached laminated film has a property of curling in the width direction, it is preferable to install tension means such as a nip roller for applying tension to both ends of the separator-attached laminated film F with the cutting device 1 interposed therebetween. . The tension force is set so that the separator does not break during or after the half cut.

  Moreover, the cutting device 1 is provided with clamping means 14 for clamping the surface of the laminated film with a separator at the time of cutting, and is installed on both sides of the round blade 10 at the time of cutting as shown in FIG. The clamp means 14 suppresses the surface of the laminated film F with a separator and suppresses the floating of the laminated film F with a separator during cutting.

  Moreover, the cutting device 1 can rotate the round blade 10 by a predetermined angle when the cutting edge 101 of the round blade 10 is damaged or worn, for example. The image of the cutting edge 101 captured by the imaging means (not shown) is image-analyzed by an image processing means (not shown CPU, memory, program, dedicated circuit, etc.) to determine whether the cutting edge 101 is damaged or worn. be able to. If it is determined that the blade is damaged or worn, the round blade 10 is automatically released from the fixed state, rotated by a predetermined angle, and fixed again. Further, the replacement timing can be notified by display, sound or the like, and the operator can manually perform the blade position replacement.

  Next, the cutting angle D will be described with reference to FIG. FIG. 1A is a schematic diagram in which the round blade 10 cuts and moves in the arrow direction along the width direction W of the laminated film F with a separator. FIG. 1B shows an enlarged view of a half cut portion (a portion indicated by a one-dot chain line) of the laminated film F with a separator by the round blade 10.

As shown in FIG.1 (b), the blade edge | tip 101 of the round blade 10 is half-cut to the adhesive layer F3 of the laminated film F with a separator (point a in the figure), and does not cut the separator F2. The blade edge 101 is half-cut from the laminated film F with separator from point b to point a in the figure. The cut thickness B half-cut by the round blade 10 is the distance from the point b to the point p, and is the thickness of the polarizing plate F1, the pressure-sensitive adhesive layers F3 and F5, and the surface protective film F4. The cutting width C half-cut by the round blade 10 is a distance from the point p to the point a. The cutting angle D is an angle formed by a straight line from point a to point b and a straight line from point a to point p, and is calculated by the following equation.
(Formula 1) D = cos ⁻¹ (C / √ (C ² + B ² )) (1)
(In Formula 1, D is the cutting angle, C is the cutting width, B is the cutting thickness (in the case of half cut) or the amount of blade penetration (in the case of full cut))
(Formula 2) C = √ (r ² − (r−B) ² ) (2)
(In Equation 2, r is the radius of the outer shape of the round blade)

  And it is preferable that this cutting angle D exceeds 0 degree and is less than 10 degrees. The outer diameter size of the round blade is set in consideration of the ease of handling of the round blade 10, the cost of the device, the viewpoint of downsizing the device, and the advantages of blade edge replacement. The cutting edge 101 is a double-edged blade. When the blade tip is a single blade, the cutting stress is concentrated on the side having no blade angle, and the cutting state changes on both sides, so the double blade is preferable. Examples of the blade angle of the blade edge 101 include 20 ° to 30 °.

  Instead of the round blade 10, a cutter blade (flat blade) having a double-edged blade edge can be used. In this case, the cutting angle D is set such that the cutting edge line of the cutter blade corresponds to the line from point a to point b in FIG.

  The moving speed at which the round blade 10 is cut off is, for example, 0.1 m / min to 100 m / min. Regardless of the cutting speed, the delamination of the polarizing plate F1 does not occur when the round blade 10 is pulled off. .

  Moreover, in FIG.1 (b), although the blade edge | tip 101 is not cut | disconnected with respect to the separator F2, even if it cuts to about 40 to 60% of the thickness of the separator F2, since the fracture | rupture of the separator F2 does not arise, it is a problem. Absent.

Example 1
The laminated film has a structure in which a surface protective film is laminated on one side of a polarizing plate via an adhesive layer, and a separator is laminated on the other side via an adhesive layer. The total thickness is 300 μm, and the thickness of the separator is 38 μm. The polarizer protective film provided on both surfaces of the polarizing plate is an acrylic film (the acrylic film will be described later). In the cutting apparatus 1 described above, the outer diameter is 200 mm, 80 mm, 40 mm, 20 mm, and 10 mm. The blade edge is different from each other using a double-edged round blade, the separator-attached laminated film is half-cut leaving the separator, and the polarizing plate delamination Was evaluated. The cutting speed of the half cut was 52 m / min. As a result, in the case of a round blade having a blade outer diameter of 200 mm (cutting angle 2.2 °), 80 mm (cutting angle 3.5 °), 40 mm (cutting angle 5 °), 20 mm (cutting angle 7 °), Delami did not occur. Moreover, there was no crack of the polarizing plate. In addition, there was no problem with kerva and lack of glue.

(Example 2)
Under the conditions of Example 1, the cutting edge of the above-mentioned blade outer diameter of 80 mm was a double-edged round blade, and the cutting speed of the half cut was 1 m / min. As a result, delamination of the polarizing plate did not occur. Moreover, there was no crack of the polarizing plate. In addition, there was no problem with kerva and lack of glue.

(Comparative Example 1)
Under the conditions of Example 1, when a double-edged blade with a blade outer diameter of 10 mm (cutting angle: 10 °) was used, delamination of the polarizing plate of about 100 μm occurred. A cross-sectional photograph of the delamination of this polarizing plate is shown in FIG. The delamination is the white undulation on the lower side of the black line in the figure.

(Comparative Example 2)
Under the conditions of Example 1, the above-mentioned cutting edge with an outer diameter of 80 mm is a double-edged round blade, the half-cutting speed is 52 m / min, and the round blade is freely rotated (in a freely rotatable state) to perform half-cutting. went. As a result, delamination of a polarizing plate of 0.1 to 0.3 mm occurred.

  As described above, from the results of Examples 1 and 2 and Comparative Examples 1 and 2, the cutting edge D of the double-edged round blade is set to be less than 10 °, and the round blade is fixed and drawn. It was confirmed that no delamination, cracks, etc. were generated and half-cut was successfully performed.

  Further, when full cutting was performed under the conditions of Examples 1 and 2 and Comparative Examples 1 and 2, the result was the same as described above, and the cutting angle D of the double-edged round blade was less than 10 °, and this By fixing the round blade and cutting it, it was confirmed that the full cut could be satisfactorily performed without causing delamination, cracks and the like of the polarizing plate after the full cut.

(Comparative Example)
Table 1 shows comparative data when the laminated film of Example 1 was cut under the following various conditions. Examples 1 and 2 and Comparative Examples 1 and 2 in Table 1 correspond to Examples 1 and 2 and Comparative Examples 1 and 2, respectively.
(1) Blade type: round blade, push-cut, carter (flat blade)
(2) Cutting edge shape: single-edged, double-edged (3) outer diameter of round blade: 200, 100, 80, 60, 40, 20, 10 (mm)
(4) Cutting speed: 52 m / sec, 1 m / sec (5) State of round blade: fixed, free rotation (6) Evaluation: “x” when the occurrence of delamination and cracks is visually confirmed, “×”, visually confirmed If it was not done, it was rated as “〇”.

  As can be seen from Table 1, delamination and cracks were confirmed when a single-edged round blade and a free-rotating blade edge were cut with a double-edged blade, a blade with a single-edged cutter, and a cutting angle of 90 °. It was. In addition, when cutting a double-edged cutter with a cutting angle D of 9 °, or when cutting a round blade with a fixed double-edged blade with a cutting angle D of less than 10 °, it was confirmed that no delamination or cracks occurred. did it. As a result of the above, by cutting a round blade or a double-edged cutter (flat blade) with a blade edge fixed at a cutting angle D of less than 10 °, it has an optical film without causing delamination and cracks. It was confirmed that the laminated film could be suitably half-cut.

(Example of manufacturing an optical display device)
In the production method of the international application WO2008 / 047712, the polarizing plate cut by half-cutting the separator-laminated film from the laminated film using the cutting method described above is formed into an optical display unit via an adhesive layer. A bonded optical display device was obtained. Since the cut polarizing plate was free from delamination and cracks, it could be suitably bonded to the optical display unit, and a high-quality optical display device could be manufactured.

  The member which comprises a laminated | multilayer film can generally illustrate the following materials.

(Polarizer)
Each treatment of dyeing, crosslinking and stretching of the polyvinyl alcohol film need not be performed separately and may be performed simultaneously, and the order of the treatments may be arbitrary. In addition, you may use the polyvinyl alcohol-type film which gave the swelling process as a polyvinyl-alcohol-type film. Generally, a polyvinyl alcohol film is immersed in a solution containing iodine or a dichroic dye, dyed by adsorbing iodine or a dichroic dye, washed, and stretched in a solution containing boric acid or borax. After uniaxial stretching at a magnification of 3 to 7 times, it is dried. After stretching in a solution containing iodine or dichroic dye, further stretching (two-stage stretching) in a solution containing boric acid or borax, etc., and then drying, the orientation of iodine increases, and the degree of polarization This is particularly preferable because the characteristics are improved.

  The adhesive treatment between the polarizer and the transparent polarizer protective film that is the protective layer is not particularly limited, but for example, an adhesive made of a vinyl alcohol polymer, boric acid, borax, or glutaraldehyde Or an adhesive comprising at least a water-soluble crosslinking agent of a vinyl alcohol polymer such as melamine or oxalic acid. Such an adhesive layer is formed as a coating / drying layer or the like of an aqueous solution. When preparing the aqueous solution, other additives and a catalyst such as an acid can be blended as necessary.

(Polarizer protective film)
An appropriate transparent film can be used for the polarizer protective film provided on one side or both sides of the polarizer. For example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy, etc. is used. Specific examples of such thermoplastic resins include cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, cyclic Examples thereof include polyolefin resins (norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof. A transparent protective film is bonded to one side of the polarizer by an adhesive layer. On the other side, as a transparent protective film, (meth) acrylic, urethane-based, acrylurethane-based, epoxy-based, silicone A thermosetting resin such as a system or an ultraviolet curable resin can be used. One or more kinds of arbitrary appropriate additives may be contained in the transparent protective film. Examples of the additive include an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a release agent, a coloring inhibitor, a flame retardant, a nucleating agent, an antistatic agent, a pigment, and a coloring agent.

The above-mentioned acrylic film will be described below. The Tg (glass transition temperature) of the (meth) acrylic resin is preferably 100 ° C. or higher, more preferably 105 ° C. or higher, further preferably 110 ° C. or higher, and particularly preferably 115 ° C. or higher. When Tg is within the above range, a polarizing plate having excellent heat resistance can be produced. Moreover, although the upper limit of Tg of the said (meth) acrylic-type resin is not specifically limited, From a viewpoint of a moldability etc., it is preferable that it is 150 degrees C or less. Any appropriate (meth) acrylic resin can be adopted as the (meth) acrylic resin as long as the effects of the present invention are not impaired. For example, poly (meth) acrylic acid ester such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-acrylic acid ester -(Meth) acrylic acid copolymer, (meth) acrylic acid methyl-styrene copolymer (MS resin, etc.), copolymer having an aliphatic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer) And methyl methacrylate-norbornyl methacrylate copolymer). Preferably, poly (meth) acrylic acid C _1-6 alkyl such as poly (meth) acrylate methyl is used. Among these, more preferred is a methyl methacrylate resin containing methyl methacrylate as a main component (50 to 100% by weight, preferably 70 to 100% by weight). Specific examples of these (meth) acrylic resins include, for example, Acrypet VH, Acrypet VRL20A manufactured by Mitsubishi Rayon Co., Ltd. Moreover, it is also possible to use what contains the (meth) acrylic-type resin which has a lactone ring structure. Examples of the (meth) acrylic resin having a lactone ring structure include JP 2000-230016, JP 2001-151814, JP 2002-120326, JP 2002-254544, and JP 2005. Examples thereof include those described in Japanese Patent No. 146084 and Japanese Patent Application Laid-Open No. 2006-171464.

  The transparent protective film may be subjected to surface modification treatment in order to improve adhesiveness with the polarizer before applying the adhesive. Specific examples of the treatment include corona treatment, plasma treatment, flame treatment, ozone treatment, primer treatment, glow treatment, saponification treatment, and treatment with a coupling agent. Further, an antistatic layer can be appropriately formed.

  The optical film according to the present invention can be exemplified by an optical film having a laminated structure in which various optical layers are laminated in practical use. The optical layer is not particularly limited, for example, on the surface of the transparent protective film that does not adhere the polarizer (the surface on which the adhesive coating layer is not provided), hard coat treatment or antireflection treatment, Examples thereof include a method of applying a surface treatment for the purpose of preventing sticking, diffusion or antiglare, and laminating an alignment liquid crystal layer for the purpose of viewing angle compensation or the like. Further, one or two optical films are used for forming a liquid crystal display device such as a reflection plate, a semi-transmission plate, a retardation plate (including a wave plate (λ plate) such as 1/2 or 1/4). The pasted ones are also included.

(Phase difference plate)
An example of the optical film laminated on the polarizer is a retardation plate. Examples of the retardation plate include a birefringent film obtained by uniaxially or biaxially stretching a polymer material, a liquid crystal polymer alignment film, and a liquid crystal polymer alignment layer supported by a film. The stretching treatment can be performed by, for example, a roll stretching method, a long gap stretching method, a tenter stretching method, a tubular stretching method, or the like. In the case of uniaxial stretching, the stretching ratio is generally about 1.1 to 3 times. The thickness of the retardation plate is not particularly limited, but is generally 10 to 200 μm, preferably 20 to 100 μm.

  Examples of the polymer material include polyvinyl alcohol, polyvinyl butyral, polymethyl vinyl ether, polyhydroxyethyl acrylate, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, polycarbonate, polyarylate, polysulfone, polyethylene terephthalate, polyethylene naphthalate, and polyethersulfone. , Polyphenylene sulfide, polyphenylene oxide, polyallylsulfone, polyamide, polyimide, polyolefin, polyvinyl chloride, cellulose polymer, or any of these binary and ternary copolymers, graft copolymers, blends, etc. Can be given. These polymer materials become oriented products (stretched films) by stretching or the like.

  The retardation plate may have an appropriate retardation according to the purpose of use, such as those for the purpose of compensating for various wavelength plates or birefringence of the liquid crystal layer, viewing angle, and the like. What laminated | stacked the phase difference plate and controlled optical characteristics, such as phase difference, etc. may be used.

(Adhesive)
The polarizing plate according to the present invention and the laminated optical film member are provided with an adhesive layer for adhering to other members such as a liquid crystal cell. The pressure-sensitive adhesive layer is not particularly limited, but can be formed with a suitable pressure-sensitive adhesive according to the conventional type such as acrylic. Low moisture absorption and heat resistance due to prevention of foaming and peeling phenomenon due to moisture absorption, deterioration of optical characteristics due to thermal expansion difference, prevention of liquid crystal cell warpage, and formation of a high-quality and durable image display device. It is preferable that it is an adhesive layer excellent in property. Moreover, it can be set as the adhesion layer etc. which contain microparticles | fine-particles and show light diffusivity. The adhesive layer may be provided on a necessary surface as necessary. For example, when referring to a polarizing plate comprising a polarizer and a polarizer protective layer, the adhesive layer is adhered to one or both surfaces of the polarizer protective layer as necessary. A layer may be provided.

(Separator: Release film)
The exposed surface of the adhesive layer is temporarily covered with a separator for the purpose of preventing contamination until it is put into practical use. Thereby, it can prevent contacting an adhesion layer in the usual handling state. As the separator, except for the above thickness conditions, for example, a suitable thin leaf body such as a plastic film, rubber sheet, paper, cloth, non-woven fabric, net, foam sheet, metal foil, laminate thereof, and the like, silicone type or Appropriate conventional ones such as those coated with an appropriate release agent such as long-chain alkyl, fluorine-based, or molybdenum sulfide can be used.

  A surface protective film is formed on the polarizing plate opposite to the surface provided with the separator via a weak adhesive. Its main purpose is to prevent scratches and pollution. As the surface protective film, for example, plastic film, rubber sheet, paper, cloth, non-woven fabric, net, foamed sheet or metal foil, appropriate thin leaves such as laminates thereof, if necessary silicone type or long chain alkyl type, Appropriate ones according to the prior art such as those coated with an appropriate release agent such as fluorine-based or molybdenum sulfide can be used.

(Liquid crystal display device)
The optical film of the present invention can be preferably used for forming various optical display devices such as liquid crystal display devices. The liquid crystal display device can be formed according to the conventional method. That is, a liquid crystal display device is generally formed by appropriately assembling components such as a liquid crystal cell (corresponding to an optical display unit), an optical film, and an illumination system as necessary, and incorporating a drive circuit. In the present invention, there is no particular limitation except that the optical film according to the present invention is used. As the liquid crystal cell, any type such as a TN type, an STN type, or a π type can be used.

F Laminated film F1 Polarizing plate F2 Separator 1 Cutting device 10 Round blade 101 Cutting edge

Claims (5)

A method of cutting a laminated film with a separator having an optical film,
Using a double-edged blade, the cutting angle of the blade with respect to the film surface to be cut is less than 10 °, the cutting angle is constant, and the blade is fixed in a direction parallel to the surface of the cutting object. A method for cutting a laminated film with a separator having an optical film, wherein the blade is moved to cut the optical film while leaving the separator . The cutting method of the laminated | multilayer film with a separator which has an optical film of Claim 1 which comprises the said blade with a round blade. The method for cutting a laminated film with a separator having an optical film according to claim 2, wherein the fixed round blade is rotated at a predetermined timing other than at the time of cutting to change the position of the blade edge for cutting. The said optical film is a polarizing plate which has a polarizer and the polarizer protective film laminated | stacked on the at least single side | surface of the said polarizer, Comprising: The said polarizing plate is cut | disconnected in the width direction of the said polarizing plate. The cutting method of the laminated | multilayer film with a separator which has an optical film of any one of these. The laminated film and the adhesive layer are cut from the laminated film with a separator formed by laminating the separator on the laminated film having the optical film via the adhesive layer, and the laminated film and the adhesive layer are cut. A method of manufacturing an optical display device by bonding to an optical display unit via
The manufacturing method of the optical display apparatus which has the process of cut | disconnecting a laminated | multilayer film and an adhesive layer using the cutting method of the laminated | multilayer film with a separator of any one of the said Claim 1 to 4.

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