JP2012234014A - Knife edge, and manufacturing system of liquid crystal display device including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knife edge which prevents foreign matter such as film waste from occurring to improve a production yield.SOLUTION: A knife edge 7 is a knife edge that peels off, from a laminated film including a peeling film, the peeling film. The knife edge 7 comprises a lower face 22 to press a peeling film 2b of a carried laminated film and a tip part 21 communicating with the lower face 22. At the tip part 21, recessed parts 25a and 25b are formed in parallel with a direction from the lower face 22 to the tip part 21.

Description

  The present invention relates to a knife edge and a liquid crystal display manufacturing system including the knife edge.

  In recent years, the demand for liquid crystal displays (LCD) used for various electronic devices has been increasing. In the manufacturing process of the liquid crystal display device, polarizing films are bonded to both surfaces of the liquid crystal panel in order to control light transmission or blocking.

As a method for bonding the polarizing film to the liquid crystal panel, a so-called chip to panel method in which the polarizing film is bonded after being cut into a size corresponding to the liquid crystal panel can be mentioned. However, this method has a drawback that the production efficiency is low because the polarizing films are bonded to the liquid crystal panel one by one. On the other hand, as another method, there is a so-called Roll to panel method in which a polarizing film is supplied to a guide roller and continuously bonded to a liquid crystal panel. According to this method, bonding can be performed with high production efficiency.

In the roll-to-panel method, the polarizing film is transported to the bonding location with the liquid crystal panel, but the polarizing film bonding surface is not attached to the polarizing film bonding surface.
It is protected by a release film (protective film) through an adhesive layer. That is, a polarizing film is conveyed in the state of the laminated film provided with the peeling film.

  For this reason, before bonding a polarizing film to a liquid crystal panel, it is necessary to peel a peeling film from a laminated panel. As a member for this purpose, a knife edge is used, which is disclosed in Patent Document 1, for example. Patent Document 1 discloses that a release film is peeled off by wrapping a release film around a knife edge and transferring it in reverse.

Patent No. 4307510 (issued on August 5, 2009)

  However, when the release film (release film) is peeled off with a conventional knife edge, there is a problem that foreign matters such as film scraps are generated. If the foreign matter is mixed into the bonding surface between the polarizing film and the liquid crystal panel due to the generation of foreign matter, the quality of the liquid crystal display device may be impaired, and the yield of the liquid crystal display device may be reduced.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a knife edge in which foreign matters such as film scraps are not easily generated, and to improve the production yield.

The inventor according to the present invention diligently studied the cause of the generation of foreign matters when using a knife edge, and found that there is a cause in contact between the end face of the release film and the knife edge. That is, the release film is slit according to the width of the polarizing film, and the end face of the release film is not a smooth cross section but is deformed. It has been clarified that the contact between the end surface and the tip of the curved knife edge causes friction on the contact surface, and foreign matters such as film scraps are generated from the deformed end surface. Based on this knowledge, the inventors have completed the present invention.

  That is, in order to solve the above-mentioned problem, the knife edge according to the present invention presses the release film out of the laminated film being conveyed at the knife edge for peeling the release film from the laminate film provided with the release film. A pressing surface and a tip portion connected to the pressing surface are provided, and at the tip portion, at least two concave portions are formed in parallel to a direction from the pressing surface toward the tip portion.

  According to the knife edge, at least two recesses are formed from the pressing surface toward the tip. Therefore, a peeling film can be conveyed so that the both end surfaces of a peeling film are arrange | positioned at the said at least 2 recessed part. The release film is peeled from the laminated film by being transported to the tip while the release film is pressed against the pressing surface. Under the present circumstances, the said recessed part is formed in the front-end | tip part, and the both ends of a peeling film do not contact a front-end | tip part. For this reason, since the generation amount of foreign matters such as film scraps that have been easily generated at the tip portion can be reduced conventionally, the foreign matters are less likely to adhere to the adhesive layer. As a result, the quality of the liquid crystal display device, which is the final product, is hardly lowered, and the production yield can be improved.

  Moreover, it is preferable that the knife edge which concerns on this invention has three or more recessed parts in the said front-end | tip part in parallel with the said direction.

  By forming three or more recesses, it is possible to provide a knife edge that can be adapted to release films having different widths.

  Moreover, it is preferable that the knife edge which concerns on this invention has a recessed part in the said press surface in parallel with the said direction.

  When the end face of the release film and the knife edge come into contact with each other, a portion where foreign matters such as film scraps are mainly generated is the tip of the knife edge. However, since the concave portion is formed on the pressing surface in addition to the tip portion, the peeling film can be transported so that the end surface of the peeling film and the pressing surface do not contact with each other on the pressing surface. As a result, foreign matters such as film waste can be further prevented from being generated.

  Moreover, in the knife edge which concerns on this invention, it is preferable that the said front-end | tip part has circular arc shape, and goes to the circular-arc-shaped part of the front-end | tip part from the said press surface.

  Moreover, it is preferable that the knife edge which concerns on this invention is provided with the suction mechanism which attracts | sucks a foreign material in the said opening part in which the opening part connected with the said recessed part is formed in the said front-end | tip part.

  According to the said structure, the foreign material which generate | occur | produced at the time of conveyance of the peeling film before reaching a front-end | tip part is attracted | sucked around the front-end | tip part, and the scattering of the foreign material in the front-end | tip part periphery is suppressed. Thereby, it can further suppress that a foreign material adheres to the adhesion layer of a polarizing film.

  The liquid crystal display device manufacturing system according to the present invention is a liquid crystal display device manufacturing system in which a polarizing film is bonded to a liquid crystal panel, and a liquid crystal panel transport unit that transports the liquid crystal panel and a release film in the transport direction of the liquid crystal panel The unwinding part which unwinds the laminated | multilayer film provided with is provided, and the said bonding mechanism contains the said knife edge.

As described above, the knife edge of the present invention comprises a pressing surface to which the release film is pressed among the laminated films being transported, and a tip portion connected to the pressing surface.
At least two recesses are formed in parallel to the direction from the pressing surface toward the tip.

  Therefore, the said recessed part is formed in the front-end | tip part, and the both ends of a peeling film do not contact a front-end | tip part at the time of peeling of the peeling film in a front-end | tip part. For this reason, since the generation amount of foreign matters such as film scraps that have been easily generated at the tip portion can be reduced conventionally, the foreign matters are less likely to adhere to the adhesive layer. As a result, the quality of the liquid crystal display device, which is the final product, is hardly lowered, and the production yield can be improved.

It is a side view which shows the manufacturing system of the liquid crystal display device which concerns on embodiment of this invention. (A) is a side view which shows the knife edge which concerns on embodiment of this invention, (b) is a side view which shows the angle of the front-end | tip part of the said knife edge. It is an end elevation which shows the knife edge which concerns on embodiment of this invention from the upper surface side. It is a perspective view which shows the knife edge which concerns on embodiment of this invention from the upper surface side. It is an end elevation which shows the knife edge which concerns on embodiment of this invention from the lower surface side. It is a perspective view which shows the knife edge which concerns on embodiment of this invention from the lower surface side. It is a top view which shows the state by which the peeling film was conveyed along the knife edge which concerns on embodiment of this invention. (A) is a perspective view which shows the knife edge which concerns on embodiment of this invention from an upper surface side, (b) is a top view which shows the knife edge which concerns on embodiment of this invention from a front-end | tip part side. It is a top view which shows the state in which the peeling film was conveyed along the knife edge which concerns on the modification of embodiment of this invention.

  An embodiment of the present invention will be described below with reference to FIGS. 1 to 9, but the present invention is not limited to this.

  FIG. 1 is a side view showing a manufacturing system (a manufacturing system of a liquid crystal display device) 100 according to the present embodiment. The manufacturing system 100 bonds the polarizing film 2 a to both surfaces of the liquid crystal panel 1. A transport direction D <b> 1 in FIG. 1 indicates the transport direction of the liquid crystal panel 1 in the manufacturing system 100.

  Next, each member with which the manufacturing system 100 is provided is demonstrated. The manufacturing system 100 includes an unwinding section 3, a guide roller 4, a half cutter 5, a support base 6, a knife edge 7, nip rollers 8a and 8b, and a winding section 9 ("nip rollers 8a and 8b" are "nip rollers 8a"). And nip roller 8b ". The same applies to other members). Further, a transport roller (liquid crystal panel transport unit) 10 and a reversing unit 11 are provided, and an unwinding unit 13, a guide roller 14, a half cutter 15, a support base 16, a knife edge 17, nip rollers 18a and 18b, and a winding unit 19 are provided. It has.

  The unwinding unit 3 unwinds the polarizing film in the transport direction of the liquid crystal panel 1, and in FIG. 1, the unwinding unit 3 unwinds the laminated film 2 in which the release film 2b is laminated on the polarizing film 2a. It has become. In the manufacturing system 100, the unwinding unit 3 has a structure that moves in a horizontal direction with respect to the axis of the raw roll of the laminated film 2. The movement is performed by a slide mechanism installed at the lower part of the unwinding unit 3. As the unwinding section 3, a conventionally known turret type unwinding section may be used.

The laminated film 2 is sent out through the guide roller 4. In this Embodiment, what is necessary is just to adjust the speed | rate, tension | tensile_strength, etc. which unwind the laminated | multilayer film 2 suitably. What is necessary is just to change suitably the size of the unwinding part 3 with the size of the laminated | multilayer film 2 to be used, and it is not specifically limited. For example, an unwinding portion 3 having a size capable of installing the laminated film 2 having a film width of 300 mm or more and 1200 mm or less may be used.

  The laminated film 2 has a three-layer structure, and a known structure can be adopted. The laminated film 2 includes a polarizing film 2a, an adhesive layer (not shown), and a release film 2b.

  The following structure is mentioned as an example of a structure of the specific polarizing film 2a. That is, a TAC (triacetyl cellulose) film or the like is bonded as a protective film on both surfaces of the polarizer film, and an adhesive layer is applied (laminated) to one or both TAC films, and the release film 2b is applied to the adhesive layer. Can be mentioned.

  As the polarizer film, a polyvinyl alcohol film dyed with iodine or the like and a film stretched in a uniaxial direction can be used. Also, in place of the above films, partially formalized polyvinyl alcohol film, ethylene / vinyl acetate copolymer partially saponified film, hydrophilic polymer film such as cellulose film, etc., dehydrated polyvinyl alcohol and polyvinyl chloride A polyene-oriented film such as a dehydrochlorinated product can also be used.

  Although the total thickness of the polarizing film 2a adhesive layer and the peeling film 2b is not specifically limited, As an example, it can be 100 micrometers or more and 500 micrometers or less. In addition, the thickness of the polarizer film in the polarizing film 2a is generally 10 μm or more and 50 μm or less. Furthermore, the laminated film 2 may further contain other layers in addition to the above three layers within a practical range.

  The adhesive layer is used to bond the polarizing film 2a and the liquid crystal panel 1 after the release film 2b is removed. The pressure-sensitive adhesive used for the pressure-sensitive adhesive layer is not particularly limited, and an acrylic, epoxy, polyurethane-based pressure-sensitive adhesive can be used, but it needs to be easily peeled from the release film 2b. For this reason, the kind of adhesive is selected according to the peeling film 2b. In addition, what is necessary is just to change the thickness of an adhesive layer suitably, for example, they can be 0.5 micrometer or more and 75 micrometers or less.

  A known release film may be used as the release film 2b. Specifically, a polyester film, a polyethylene terephthalate film, or the like can be used. Although it does not specifically limit as thickness of the said peeling film, The peeling film of 5 micrometers or more and 100 micrometers or less can be used preferably. Moreover, the width | variety of a peeling film can be 300 mm or more and 1200 mm or less. Note that the release film 2b may be generally referred to as a protective film or a separator.

  Although the laminated film 2 is conveyed through each guide roller 4, since the liquid crystal panel 1 is a sheet form, it is necessary to cut | disconnect the elongate polarizing film 2a and the adhesion layer before bonding. That is, the laminated film 2 needs to be half cut. The members for performing the half cut are the half cutter 5 and the support base 6. The support base 6 is disposed at a position in contact with the release film 2b and is installed to prevent the laminated film 2 from being shaken. The polarizing film 2a and the adhesive layer are cut by the half cutter 5 while the release film 2b side is supported. At this time, the release film 2b is not cut. That is, the laminated film 2 is half cut.

The knife edge 7 is a member for removing the release film 2 b from the laminated film 2. As a material constituting the knife edge 7, a metal material, a resin material, or the like can be applied. Although not particularly limited, stainless steel, aluminum, a resin material, and the like are recommended from the viewpoint of corrosion resistance. The knife edge 7 will be described later with reference to FIGS.

  Although not shown, the manufacturing system 100 is provided with a position adjusting device that adjusts the conveying position in the width direction of the polarizing film 2, and the laminated films 2 and 12 (release film) conveyed along the knife edges 7 and 17. 2b) can be adjusted. Even if the end surface of the laminated film 2 meanders by the position adjusting device, the position of the laminated film 2 can be adjusted to an appropriate transport position. The reason for installing the position adjusting device is that the laminated film 2 is usually slit to a short width, and the end surface of the laminated film 2 is usually not flat (meandering) in the slitting process. . The position adjusting device includes a camera for confirming the positions of the end faces of the laminated film 2 and the release film 2b and a guide roller adjusting device for adjusting the position of the guide roller 4.

  Next, the conveyance roller 10 provided in the upper part of the manufacturing system 100 will be described. The liquid crystal panel 1 is conveyed between the nip rollers 8a and 8b for bonding with the polarizing film 2a.

  As the liquid crystal panel 1, a known liquid crystal panel can be used. For example, a liquid crystal panel in which an alignment film is disposed between a substrate such as a glass substrate and a liquid crystal layer can be used.

  The transport roller 10 is a member that transports the liquid crystal panel 1. The transport roller 10 only needs to be able to transport the liquid crystal panel, and another configuration such as a robot arm may be used instead of the transport roller 10.

  The nip rollers 8a and 8b are members for bonding the polarizing film 2a and the liquid crystal panel 1. Of the nip rollers 8 a and 8 b, the lower nip roller 8 b is disposed at the same height as the transport roller 10. On the other hand, the nip roller 8a is disposed above the nip roller 8b, and the polarizing film 2a is bonded to the lower surface of the liquid crystal panel 1 through an adhesive layer (not shown) by the nip rollers 8a and 8b.

  The nip rollers 8a and 8b can change the distance between each other, and are bonded by pressing the adhesive layer surface of the polarizing film 2a and the liquid crystal panel 1. What is necessary is just to adjust suitably the pressure and temperature (heater temperature in a nip roll) of the nip roller 8a * 8b at the time of bonding according to the kind of adhesive, the thickness of the polarizing film 2a, etc.

  The liquid crystal panel 1 having the polarizing film 2a bonded to the lower surface is reversed so that the reverse side 11 changes the front and back, and the short side along the transport direction is the long side. In FIG. 1, the liquid crystal panel inverted by the inversion unit 11 is shown as a liquid crystal panel 1a. In the manufacturing system 100, a robot arm is employed as the reversing unit 11. By reversing the liquid crystal panel 1 by the reversing unit 11, the polarizing film 12a is arranged so that the absorption axis of the polarizing film 12a is orthogonal to the absorption axis of the polarizing film 2a on the lower surface of the liquid crystal panel 1 (the polarizing film is not bonded). Can be pasted.

  The long side of the liquid crystal panel 1 may be transported along the transport direction. In that case, the short side of the liquid crystal panel 1a after being reversed by the reversing unit 11 is transported along the transport direction. Will be.

The liquid crystal panel 1a that is reversed and has the long side along the transport direction D1 is further transported in the transport direction D1 and reaches the nip rollers 18a and 18b. Below the nip roll 18 b, similarly to the unwinding unit 3, the laminated film 12 is unwound from the unwinding unit 13. Then, the peeling film 12b is peeled from the laminated film 12 by the knife edge 17, and the polarizing film 12a is bonded to the lower surface of the liquid crystal panel 1a through the adhesive layer. The liquid crystal panel 1 a having the polarizing films bonded to both sides corresponds to a liquid crystal display device, and the liquid crystal display device is manufactured by the manufacturing system 100.

  The knife edge 7 will be further described. The same applies to the knife edge 17. FIG. 2A is a side view relating to the knife edge 7. FIG. 3 is an end view showing the knife edge 7 near the tip 21 toward the upper surface 20. As shown in FIGS. 2 and 3, the knife edge 7 includes an upper surface 20, a tip portion 21, a lower surface (pressing surface) 22, a rear end 23, a side surface 24a, and a side surface 24b (not shown).

  Since the release film 2b is peeled along the lower surface 22, the tip portion 21, and the upper surface 20, the lower surface 22, the tip portion 21, and the upper surface 20 have a smooth shape. That is, the upper surface 20 and the lower surface 22 have a planar shape, and the distal end portion 21 has a curved shape.

  FIG. 2B is a side view showing the angle of the tip of the knife edge 7. As shown in FIG. 2B, the tip 21 has an arc shape. For this reason, the side surface (or cross section) of the front end portion 21 has a fan shape, and the central angle A of the cross section at the front end portion 21 is 155 °. Since the upper surface 20 and the lower surface 22 are formed along the normal line of the distal end portion 21, the upper surface 20 and the lower surface 22 are not horizontal to each other but have an inclination.

  The arc shape (side surface or cross section) of the distal end portion 21 is not limited to the above angle, and can be, for example, a sector shape having a central angle A of 30 ° or more and 180 ° or less. Preferably, the arc shape of the distal end portion 21 is a fan having a central angle A of 45 ° or more and 180 ° or less, more preferably a fan having a central angle A of 90 ° or more and 180 ° or less, particularly preferably a center. It has a fan shape with an angle of 120 ° or more and 180 ° or less. When the central angle A is less than 30 °, the distance between the peeled release film 2b and the polarizing film 2a is short, and it becomes difficult to carry them. When the central angle A is 45 ° or more, and further 120 ° or more, the release film 2b and the polarizing film 2a can be transported in different transport directions, and the production system 100 that can easily collect the release film 2b can be provided. . On the other hand, when the central angle A exceeds 180 °, the upper surface 20 cannot be formed along the normal line of the distal end portion 21, and it becomes difficult to design the distal end portion 21 and the upper surface 20 in a smooth structure. .

  In the knife edge 7, the direction D <b> 2 is directed from the lower surface 22 to the arc-shaped portion of the tip portion 21. For this reason, the circular arc shape of the front-end | tip part 21 is located on the surface parallel to the direction D2, or the same surface. The laminated film 2 is conveyed toward the arc-shaped portion of the tip portion 21, and the release film 2 b is peeled along the arc shape of the tip portion 21. Thereby, a peeling film is peeled smoothly.

  Since the radius of the tip portion 21 is appropriately changed according to the thickness and hardness of the release film 2b, it is difficult to uniquely define it. As an example, the radius of the sector cross section of the tip portion 21 is 1 mm or more. 10 mm or less, preferably 2 mm or more and 5 mm or less. By setting it as said radius, peeling of the peeling film 2b can be made suitably.

Moreover, in order not to damage the peeling film 2b, the lower surface 22 and the front-end | tip part 21 are connected smoothly, and the corner | angular is not formed. Moreover, the front-end | tip part 21 and the upper surface 20 are also connected smoothly, and the corner | angular is not formed. Since there is no problem as long as the release film 2b is not damaged, the lower surface 22, the tip 21 and the upper surface 20 need only have a smooth shape where the release film 2b contacts, and the portion where the release film 2b does not contact is smooth. It does not have to be a simple shape. For example, the lower surface 22 and the side surface 24a are not smoothly connected and have corners, but the release film 2b is not damaged thereby. Here, the smooth shape means a shape formed by at least one of a flat surface and a curved surface.

  The side surfaces 24a and 24b only need to connect the upper surface 20, the front end portion 21, the lower surface 22 and the rear end 23, and the shape of the side surfaces 24a and 24b is not particularly limited, and may be a flat surface or a curved surface. Further, as a modification of the knife edge 7, a structure including a support member that supports the tip portion 21 and the lower surface 22 in place of the side surfaces 24a and 24b can be cited. If the tip 21 and the lower surface 22 are supported by the support member and the structure of the knife edge is maintained, the knife edge according to the present invention can be configured.

  The rear end 23 only needs to connect the upper surface 20, the lower surface 22, and the side surfaces 24a and 24b, and the shape of the rear end 23 is not particularly limited. Similar to the side surfaces 24 a and 24 b, the shape may be a flat surface or a curved surface, or may be a support member that supports the upper surface 20 and the lower surface 22 instead of the rear end 23. Further, even if the rear end 23 is not present, the rear end 23 may be omitted as long as the structure of the knife edge 7 including the front end portion 21 and the lower surface 22 can be maintained.

  As shown in FIG. 3, recesses 25 a, 25 b, 25 c, and 25 d are formed in the distal end portion 21. FIG. 4 is a perspective view showing the knife edge 7 in the vicinity of the tip 21 from the upper surface 20 side. Furthermore, the shape from the lower surface 22 of the knife edge 7 is shown in FIG. FIG. 5 is an end view showing the knife edge 7 in the vicinity of the tip 21 toward the lower surface 22. FIG. 6 is a perspective view showing the knife edge 7 in the vicinity of the tip 21 from the lower surface 22 side.

  The knife edge according to the present invention is formed with at least two recesses. In the knife edge 7 shown in FIGS. 3 to 6, four recesses 25a, 25b, 25c, and 25d are formed as a preferred form. .

  As described above, the release film 2 b provided in the laminated film 2 is conveyed along the lower surface 22. Here, the release film 2 b of the laminated film 2 is conveyed while being pressed against the lower surface 22. Thus, conveyance while pressing the release film 2 b against the lower surface 22 can be performed by adjusting the positions of the guide roller 4, the knife edge 7, and the nip roll 8.

  Since the adhesive layer (not shown) and the release film 2b have a small adhesive force, the release film 2b conveyed while being pressed against the lower surface 22 is separated from the adhesive layer and is conveyed along the tip portion 21. Under the present circumstances, the laminated | multilayer film 2 is arrange | positioned previously so that the track | orbit which the both end surfaces of the peeling film 2b may overlap with a recessed part.

  Here, the end surface of the long release film 2b is not necessarily along the flow direction (line direction) of the release film 2b, but is usually meandering. However, both end surfaces of the release film 2b are adjusted so as to pass through any of the recesses 25a to 25d by a position adjusting device (not shown). For this reason, the width W1 of the recesses 25a to 25d may be small, and may be 2 mm or more and 20 mm or less, preferably 5 mm or more and 15 mm or less. Since the width W1 is small, it is possible to provide knife edges 7 and 17 that are difficult to prevent the peeling and transport of the release film 2b.

The recess is formed so that the length connecting the centers of the two recesses is the width of the release film 2b. When the knife edge 7 transports the release film 2b having a narrow width, the transport position of the polarizing film 2a is set so that the trajectory passing through both end faces of the release film 2b overlaps the recesses 25b and 25c. On the other hand, when transporting the wider release film 2b, the transport position of the laminated film 2 is set so that the trajectory through which both end faces of the release film 2b pass overlaps the recesses 25a and 25d. As described above, it is sufficient that at least two concave portions are formed, but by forming three or more concave portions, it is possible to provide the knife edge 7 that can be adapted to different widths of the release film 2b.

  Here, the distance connecting the centers of the recesses in the width direction of the release film 2b (in the direction orthogonal to the conveyance direction of the release film 2b or in the width direction of the tip portion 21) is Since it is preferable to match the width, the widths W2 and W3 can be set to 300 mm or more and 1200 mm or less. In the knife edge 7, the width W2 is set to 1200 mm, and the width W3 is set to 700 mm.

  Since four recesses are formed in the knife edge 7, the transport position of the laminated film 2 may be set so that both end faces of the release film 2b pass through the recesses 25a and 25b. The distance between the centers of the recesses 25a and 25b in the width direction of the release film 2b is set to 300 mm. Moreover, the conveyance position of the laminated | multilayer film 2 may be set so that the both end surfaces of the peeling film 2b may pass the recessed part 25a * 25c.

  FIG. 7 is a plan view showing a state in which the peeled release film 2 b is conveyed along the knife edge 7. As shown in FIG. 7, the end surface (edge) of the release film 2b peeled off at the tip 21 does not come into contact with the tip 21 because the recesses 25a and 25d are formed. For this reason, since the generation amount of foreign matters such as film scraps that have been easily generated at the tip portion can be reduced conventionally, the foreign matters are less likely to adhere to the adhesive layer. As a result, the quality of the liquid crystal display device which is the final product is hardly deteriorated, and the production yield can be improved.

  As a preferred form, as shown in the end view of FIG. 5, the knife edge 7 has not only the tip portion 21 but also the lower surface 22 with a recess 25 a parallel to the direction D <b> 2 from the lower surface 22 toward the tip portion 21. To 25d are formed. The recesses 25 a to 25 d in the distal end portion 21 and the recesses 25 a to 25 d in the lower surface 22 are connected to each other, and a series of recesses 25 a to 25 d are formed from the lower surface 22 to the distal end portion 21.

  When the end face of the release film 2b and the knife edge 7 are in contact with each other, a portion where foreign matters such as film scraps are mainly generated is the tip portion 21. Since the recesses 25a to 25d are formed in the lower surface 22 in addition to the tip portion 21, the release film 2b can be transported so that the end surface of the release film 2b and the lower surface 22 do not contact with each other on the lower surface 22. . As a result, foreign matters such as film waste can be further prevented from being generated.

  Next, a knife edge 7a, which is a modification of the knife edge according to the present invention, will be described with reference to FIG. FIG. 8A is a perspective view showing the knife edge 7a from the upper surface 20 side, and FIG. 8B is a plan view showing the knife edge 7a from the distal end portion 21 side.

  The knife edge 7a is formed with four openings connected to the recesses 25a to 25d. The four openings are provided with suction mechanisms 26a to 26d, respectively. The opening is formed to face the release film 2b passing through the tip 21. In the knife edge 7a, the size of the opening formation region and the suction mechanisms 26a to 26d are the same, but each of the openings only needs to be able to arrange the suction mechanisms 26a to 26d. The region may be designed larger than the size of the suction mechanisms 26a to 26d.

Unlike the knife edge 7a, the opening may be formed at the tip 21 because the opening does not hinder the conveyance of the peeling film 2b. Arranged along the direction). In this case, the suction mechanism is disposed perpendicular to the conveyance direction of the release film 2b.

  The suction mechanisms 26a to 26d suck air such as film dust by sucking air. As the suction mechanisms 26a to 26d, known suction mechanisms can be used. For example, a suction mechanism such as a vacuum suction type can be used. In the knife edge 7a, the suction mechanisms are installed at four locations, but may not be installed at all the concave portions, and may be installed at at least one location.

  FIG. 9 is a plan view showing a state in which the peeled release film 2b is conveyed along the knife edge 7a. As shown in FIG. 9, at the knife edge 7a, the end faces of the release film 2b and the tip 21 are not in contact with each other because the recesses 25a and 25d are formed. However, there is a possibility that foreign matters such as film scraps have already adhered to the release film 2b due to contact with the lower surface 22 or the guide roller 4. Such a foreign substance can be scattered when the conveyance direction of the release film 2b is greatly curved at the tip portion 21.

  According to the knife edge 7a, since the suction mechanisms 26a to 26d are provided, the foreign matter generated before reaching the tip portion 21 is sucked, and scattering of the foreign matter around the tip portion 21 is suppressed. Thereby, it can further suppress that a foreign material adheres to the adhesion layer of a polarizing film. As a result, the yield of the liquid crystal display device can be improved.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the technical means disclosed in different embodiments can be appropriately combined. Such embodiments are also included in the technical scope of the present invention.

  The knife edge according to the present invention can be used in the field of bonding an optical film to a liquid crystal panel.

1.1a Liquid crystal panel 2/12 Laminated film 2a / 12a Polarizing film 2b / 12b Release film 3.13 Winding part 4.14 Guide roller 5.15 Half cutter 6.16 Support base 7.7a.17 Knife edge 8a. 8b / 18a / 18a Nip roll 9.19 Winding part 10 Conveying roller 11 Reversing part 20 Upper surface 21 Tip part 22 Lower surface (Pressing surface)
23 Rear end 24a / 24b Side surface 25a / 25b / 25c / 25d Recess 26a / 26d Suction mechanism 100 Manufacturing system A Center angle D1 Conveying direction D2 direction

Claims (6)

In the knife edge that peels the release film from the laminated film with the release film,
Of the laminated film being conveyed, the pressing surface against which the release film is pressed,
A tip portion connected to the pressing surface,
The knife edge according to claim 1, wherein at least two recesses are formed in parallel to a direction from the pressing surface toward the tip.   2. The knife edge according to claim 1, wherein three or more concave portions are formed in the tip portion in parallel to the direction.   The knife edge according to claim 1 or 2, wherein a concave portion is formed in the pressing surface in parallel to the direction. In the tip portion, an opening connected to the recess is formed,
The knife edge according to claim 1, wherein the opening includes a suction mechanism that sucks foreign matter. The tip has an arc shape;
The knife edge according to any one of claims 1 to 4, wherein the direction is from the pressing surface toward an arc-shaped portion of a tip portion. In a manufacturing system of a liquid crystal display device that bonds a polarizing film to a liquid crystal panel,
A laminating mechanism including a liquid crystal panel transport unit that transports the liquid crystal panel, and an unwinding unit that unwinds the laminated film including the release film in the transport direction of the liquid crystal panel,
The said bonding mechanism contains the knife edge of any one of Claims 1-5, The manufacturing system of the liquid crystal display device characterized by the above-mentioned.

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