JP5877257B2 - Apparatus and method for forming optical film laminate strips - Google Patents

Description

  The present invention relates to an apparatus and method for slitting a web-like optical film laminate to an appropriate size to form an optical film strip.

  Optical functional films such as a polarizing film and a retardation film are used as optical components of an optical display device by being bonded to an optical display panel via an adhesive layer. In general, these optical functional films are obtained by cutting a web-shaped optical film laminate having a predetermined width including a release film, an adhesive layer, and an optical functional film into a rectangular shape to form a sheet-like optical film laminate. By releasing the release film from the body, it is obtained in a state with an adhesive layer. The web-like optical film laminate having a predetermined width is formed by cutting a web-like optical film laminate having a wider width than the web-like optical film laminate in a predetermined width in parallel with the length direction. In this specification, cutting such a wide web-shaped optical film laminate in parallel with the length direction is called a slit, and an apparatus for performing the slit is called a slitter.

  As a method for slitting a wide web-shaped optical film laminate, for example, a technique described in Patent Document 1 (Japanese Patent Laid-Open No. 2006-289601) has been proposed. This technique is a web-like optical film between a circular blade disposed on one surface side of an optical film laminate and another circular blade disposed at a position corresponding to the circular blade on the other surface side. This is a slitting method in which a plurality of web-shaped optical film laminates having a predetermined width can be formed by moving the laminate.

  However, with this slitting method, the optical film laminate is not supported at the slit position, and is in a floating state, so there is a problem that the slit position varies and it is difficult to improve the slit accuracy. there were. Here, the slit accuracy is the degree of variation in the length direction of the difference between the measured value and the target value for the width of the obtained web-like optical film laminate when slitting a wide web-like optical film laminate. Yes, high slit accuracy means that this variation is small. Improvement of slit accuracy is an important issue particularly in recent optical display devices. In recent years, optical display devices have been reduced in size, thickness, and weight, and accordingly, the display area and its periphery have been narrowed, that is, the frame has been narrowed. As the demand for narrowing the frame increases, the bonding accuracy representing the accuracy of the bonding position between the display panel of the optical display device and the optical function film is required to be higher, and the bonding accuracy is increased. For this purpose, it is important to increase the slit accuracy of the web-like optical film laminate.

  In recent years, a roll-to-panel (RTP) system is being adopted at the manufacturing site of optical display devices. In the RTP method, a web-like optical film laminate having a width corresponding to the long side or the short side of the optical display device is fed out from a roll, and the web-like optical film laminate that has been fed out is fed into the short side or the long side of the optical display device. This is a method of manufacturing an optical display device by continuously cutting in the width direction at intervals corresponding to the sides and continuously sticking the generated sheet-like optical film to the optical display panel. In this technique, after the release film is peeled from the sheet-like optical film laminate, an optical functional film having an adhesive layer is bonded to the optical display panel. In such an RTP method, the slit accuracy directly affects the bonding accuracy. However, in the slit method as in Patent Document 1 where it is difficult to increase the slit accuracy, there is a limit to the improvement of the bonding accuracy in the RTP method.

  As a technique for improving the slit accuracy, for example, a technique described in Patent Document 2 (Japanese Patent Laid-Open No. 2005-230968) has been proposed. In this technique, one surface of a plastic film is supported by a grooved roller, and the film is slit by a blade provided at a position corresponding to the groove on the other surface side of the film. In this slitting method, the film is slit while being brought into contact with the outer peripheral surface of the roller. Therefore, the slit position is supported by the outer peripheral surface and is advantageously stabilized.

  However, in the slit method as described in Patent Document 2, a force is applied only from one side to the film, so the slit accuracy is somewhat improved compared to the slit method as described in Patent Document 1. However, the accuracy required in the narrow frame technology and the RTP method cannot be obtained.

  As a technique for improving the slit accuracy, for example, a technique described in Patent Document 3 (Japanese Patent Application Laid-Open No. 2012-71414) has been proposed. In this technique, one surface of a plastic film is supported by a grooved roller whose outer peripheral edge portion is configured as a blade, and a blade provided at a position corresponding to the edge portion blade on the other surface side of the film; In this method, the film is slit by the edge blade. In this slit method, since the film is supported by the roller in the immediate vicinity of the slit position, the slit accuracy can be improved as compared with the slit method described in Patent Document 2.

  However, in the technique described in Patent Document 3, the shape of the blade on one side of the film is different from the shape of the blade on the other side, so that the cut surface shape of the end of the slit film is It becomes non-uniform at both ends of the same film or between different films. Such unevenness may adversely affect the bonding accuracy. With respect to this point, the techniques described in Patent Document 1 and Patent Document 2 can make the cut surface shape uniform at the film end, but as described above, there is a problem in slit accuracy.

  As a technique for improving the slit accuracy, a technique described in Patent Document 4 (Japanese Utility Model Publication No. 61-184690) has also been proposed. This technique relates to a cutting device having a structure in which a slitter blade, in which the blade edges of a pair of circular blades are stacked, is arranged on the same axis as a sheet feed roller.

  Since this technique can cut the sheet material to be cut from both sides with the roller, there is an advantage that the cutting accuracy is improved, but one or both blades protrude outward from the outer peripheral surface of the roller. It is difficult to pass the paper without damaging the cut sheet material, and the workability is extremely poor.

  As described above, in the conventional technique, workability is improved by improving the slit accuracy of the wide web-shaped optical film laminate and improving the uniformity of the cut surface shape at the end of the slit web-shaped optical film laminate. It was difficult to achieve both without sacrificing. However, considering the demand for narrowing the frame and promoting the introduction of the RTP method, it is extremely possible to achieve improved slit accuracy and improved uniformity of the cut surface shape at the same time without sacrificing workability. is important.

  Further, in addition to the problems of slit accuracy and cut surface shape uniformity, it is necessary to take into account the problem of sticking or chipping of the adhesive and local peeling of the release film. The protrusion or chipping of the pressure-sensitive adhesive on the cut surface often occurs due to deformation of the film at the time of slitting, for example, when the blade pushes the film in the technique described in Patent Document 2. The film in which the adhesive protrudes or is chipped may cause problems such as surface contamination of the film and contamination with foreign substances when the substrate is stuck. Moreover, the local peeling of the release film is performed, for example, by using the technique described in Patent Document 1 when the wide optical film laminate is slit by a rotating circular blade, and the gap between the release film and the adhesive layer is reduced. This is a phenomenon of partial peeling. Local peeling is considered to be caused by the fact that the release film is pulled in the rotation direction of the blade when the slit of the web-shaped optical film laminate is performed. In the optical film laminate in which such local peeling occurred, when the release film was peeled off and the adhesive layer was bonded to the optical display panel, the part where the release film was peeled and the surrounding area If a streak enters the boundary with the closely contacted part or water enters the peeled part, the optical display device may be defective.

  As a technique for solving the problem of peeling at the time of cutting an optical film, Patent Document 5 (Japanese Patent Laid-Open No. 2010-76081) has been proposed. In this technology, for a resin sheet with a protective film provided with protective films on both the front and back sides of the resin sheet, a cut is made from the front side of the resin sheet to a predetermined depth, and the rotary blade is advanced from the back side to a position deeper than the cut. By cutting the resin sheet, no burr is generated on the cut surface, and the protection film can be prevented from floating.

  However, in the technique of Patent Document 5, there is a limit to the improvement of the slit accuracy as in the technique described in Patent Document 1, and it is difficult to achieve the improvement of the slit precision and the uniformity of the cut surface shape at the same time.

  Moreover, the adhesive layer and the protective film are laminated | stacked on the front and back both surfaces of the resin sheet made into the object of a slit in the technique of patent document 5 in the same order seeing from the resin sheet side. That is, in this technique, protective films with an adhesive layer having a symmetrical configuration with respect to the resin sheet are laminated on both the front and back surfaces of the resin sheet, and any of them is peeled off at the interface between the resin sheet and the adhesive layer. This is a technique for slitting a structured optical film laminate. Therefore, this technique is an optical film laminate in which the present application is an object of slitting, that is, an optical film laminate in which an adhesive layer and a release film are laminated only on one surface of at least an optical functional film, or at least optical In the asymmetric type optical film laminate, an adhesive layer and a release film are laminated on one side of a functional film, and a member having an asymmetric structure with respect to the optical functional film is laminated on the other side. It is difficult to suppress local peeling between the film and the release film.

  As technologies in other fields, Patent Documents 6 and 7 disclose slitters for slitting a paper web. These slitters include a rotary cutting blade provided on one side of the paper web and a rotary cutting drum provided on the other side of the paper web. The rotary cutting drum is associated with the rotary cutting blade. A mating annular drum knife is provided. The object of these slits is not an asymmetric web-like optical film laminate, but a single-layer or multi-layer paper web. The technology in these documents aims to solve the problem of cutting failure and dust generation suppression due to tearing of paper fibers, the problem of local delamination between layers, and a drum for suppressing it, As a matter of course, the arrangement relationship between the apparatus members such as blades and rollers and the web is not considered at all.

JP 2006-289601 A JP 2005-230968 A JP 2012-71414 A Japanese Utility Model Publication No. 61-184690 JP 2010-76081 A Japanese Patent Laid-Open No. 54-11583 JP 55-144990 A

  The problem of the present invention is to address the above-mentioned problems, improve the slit accuracy of the wide web-like optical film laminate, and improve the uniformity of the cut surface shape at the end of the slit web-like optical film laminate, It is an object of the present invention to provide a slitting device and a method capable of suppressing protrusion or chipping of an adhesive or local peeling of a release film at the time of slitting.

  In the first aspect, the present invention includes a web-like optical functional film, and a web-like release film laminated on one side of the optical functional film via an adhesive layer, An apparatus for forming a plurality of optical film laminate strips by slitting an optical film laminate configured to be peelable at an interface with an adhesive layer in parallel with a length direction. This apparatus has an outer peripheral surface disposed so that the release film of the optical film laminate is in contact with the outer peripheral surface and a plurality of grooves provided so as to be continuous in the circumferential direction at any position of the outer peripheral surface. A laminate support roller that rotates about a rotation axis parallel to the width direction of the optical film laminate, each having an acute blade edge, and each of the acute blade edges is inside a corresponding groove portion of the plurality of groove portions. And a plurality of first circular cutting blades attached to the laminated body support roller so as to be positioned at the center. The apparatus also includes an acute angle cutting edge, and each of the acute angle cutting edges has a plurality of first circular cutting blades on a side opposite to the plurality of first cutting blades with respect to the optical film laminate. A plurality of second circular cutting blades are provided so as to be disposed at positions corresponding to the respective acute angle blade edges and slit the optical film laminate in cooperation with the plurality of first circular cutting blades. The optical film laminate is an optical film laminate out of two points on the outer periphery of two acute angle cutting edges that intersect when the acute angle cutting edge of the first circular cutting blade and the acute angle cutting edge of the second circular cutting blade overlap. At the position upstream of the point upstream of the feed direction, it touches the stack support roller so that it touches the stack support roller at a position downstream of the point downstream of the feed direction of the two points. Touch. According to one embodiment of the present invention, such a contact state between the optical film laminate and the laminate support roller supports the optical film laminate on the upstream side of the position where the optical film laminate contacts the laminate support roller. And the downstream support roller disposed so as to support the optical film laminate on the downstream side of the position where the optical film laminate is separated from the laminate support roller. . According to this apparatus, the optical film laminate having high slit accuracy and excellent cut surface shape uniformity by increasing the distance in the length direction in which the optical film laminate contacts the outer peripheral surface (increasing the holding angle). A body strip can be obtained. Moreover, according to this apparatus, since it slits in the state in which the release film side was supported by the outer peripheral surface, local peeling of a release film can be suppressed.

  According to one embodiment of the present invention, it is preferable that the acute angle cutting edges of the plurality of first circular cutting blades and the acute angle cutting edges of the plurality of second circular cutting blades have the same shape. According to this apparatus, it is possible to obtain optical film laminate strips having the same shape of the cut surfaces at the left and right ends.

  According to one embodiment of the present invention, it is preferable that the tips of the acute blade edges of the plurality of first circular cutting blades are located on the same surface as the outer peripheral surface of the laminated body support roller. According to this apparatus, since the deflection of the optical film laminate due to the pressing of the cutting blade does not occur at the slit position, it is possible to obtain an optical film laminate strip with higher slit accuracy and no adhesive sticking out or chipping. it can.

  In a second aspect, the present invention includes a web-like optical functional film, and a web-like release film laminated on one surface side of the optical functional film via an adhesive layer, and the release film A method of forming a plurality of optical film laminate strips by slitting an optical film laminate configured to be peelable at the interface between the adhesive layer and the adhesive layer in parallel with the length direction. The method includes a step of feeding the optical film laminate in the length direction while supporting the surface side of the release film of the optical film laminate, and a surface side each supporting an optical film laminate, each having an acute edge A plurality of first circular cutting blades, each having an acute angle cutting edge, and each of the acute angle cutting edges is opposite to the plurality of first circular cutting blades with respect to the optical film laminate, Slitting the optical film laminate in cooperation with a plurality of second circular cutting blades provided so as to be arranged at positions corresponding to each of the acute angle cutting edges of the plurality of first circular cutting blades; including. According to this method, an optical film laminate strip with high slit accuracy and excellent cut surface shape uniformity can be obtained. Moreover, according to this method, since the release film side is slit with the outer peripheral surface being supported, local peeling of the release film can be suppressed.

It is a perspective view showing an outline of a slit system provided with a slitter concerning one embodiment of the present invention. (A) is a structural example of the optical film laminated body used as the object of a slit in the slitter which concerns on one Embodiment of this invention, (b) is the case where the said optical film laminated body is slit with the conventional slitter. The state which the local peeling generate | occur | produced in the release film is shown. It is a front view which shows the outline | summary of the slitter which concerns on one Embodiment of this invention. FIG. 4 is a view of the slitter, the feed roller, and the guide roller shown in FIG. 3 as viewed from the right side, and an optical film laminate at the time of slitting, a laminate support roller, a first circular cutting blade, a second circular cutting blade, In addition, it is a schematic diagram for explaining the relationship between a feed roller (upstream support roller) and a guide roller (downstream support roller). When slitting an optical film laminate with a slitter according to an embodiment of the present invention (Example 1) and slitting with a conventional technique in which the shape of the first cutting blade and the shape of the second cutting blade are different ( It is a figure showing the comparison of the shape of a cut surface with the comparative example 2).

  Hereinafter, an optical film laminate strip forming apparatus and forming method according to the present invention will be described in detail with reference to the drawings.

[Outline of slit system]
FIG. 1 is a perspective view showing an outline of a slit system 10 including a slitter 20 according to an embodiment of the present invention. FIG. 3 is a front view showing an outline of the slitter 20 according to the embodiment of the present invention.
In the illustrated slit system 10, an optical functional film is manufactured through an adhesive layer, for example, by being attached to a rectangular optical display panel having a long side and a short side. Relatedly, the slitter 20 for slitting the web-shaped optical film laminate 40 to an appropriate width is provided. The slitter 20 slits the wide web-shaped optical film laminate 40 in parallel with the length direction to generate a plurality of optical film laminate strips having a predetermined width corresponding to the size of the optical display panel. It is configured.

  In the slit system 10, the roll 42 of the optical film laminate 40 is rotatably supported on the support shaft 12. The optical film laminate 40 fed out from the roll 42 is fed in the length direction by the pair of feed rollers 13a and 13b. The slitter 20 is arranged behind the feed rollers 13a and 13b with respect to the length direction of the optical film laminate 40 (that is, downstream in the feed direction of the optical film laminate 40). As shown in FIG. 3, the slitter 20 includes laminated body support rollers 21, 22, 23 and 24 with which the optical film laminated body 40 abuts, first circular cutting blades 25, 26 and 27, and a second circular shape. A plurality of optical film laminate strips 44a to 44d having a predetermined width are formed by cutting the optical film laminate 40 in parallel with the length direction. The optical film laminate strip 44 a that has exited the slitter 20 is fed in the length direction by the pair of feed rollers 15 a and 15 b via the guide roller 14, and is taken up by the roll 46 supported by the take-up shaft 17. . Similarly, the optical film laminate strip 44b is sent in the length direction by the pair of feed rollers 16a and 16b via the guide roller 14, and is taken up by the roll 48 supported by the take-up shaft 18. The optical film laminate 40 is slit while holding the laminate supporting rollers 21, 22, 24 and 24 of the slitter 20 at a predetermined holding angle as will be described later with reference to FIG. The optical film laminate strips 44c and 44d are edges that are normally cut off and discarded, and are taken up by a take-up shaft (not shown).

[Optical film laminate]
The optical film laminate in which the slitter according to the present invention is a slit is an optical film in which an adhesive layer and a release film are laminated in this order on one surface of an optical functional film, and nothing is laminated on the other surface. An optical film in which an adhesive layer and a release film are laminated in this order on one side of a laminate or an optical functional film, and a member having an asymmetric structure with respect to the optical functional film is laminated on the other side It can be set as a laminated body. That is, in the optical film laminate that is the object of the slit in the present invention, the structure of the members laminated on both sides of the optical functional film is asymmetric, and the release film and the adhesive layer laminated on one side are both It is configured to be peelable at the interface. In addition, in the optical film laminate that is the object of the slit in the present invention, the optical functional film contained in the laminate is similarly applied to another liquid crystal display panel or the like through the adhesive layer contained in the laminate. It is laminated on the member. Therefore, since the adhesive layer contained in the optical film laminate is also included in the product as it is, in this laminate, the presence or absence of local peeling that occurs at the time of slitting may affect the yield of the product. is there.

  Fig.2 (a) is a structural example of the optical film laminated body 40 which the slitter 20 which concerns on one Embodiment of this invention makes the object of a slit. The optical film laminate 40 includes a polarizing film 50 in which a polarizer 51 and protective films 52 and 53 are laminated. The optical film laminate 40 may include another optical function film such as a retardation film instead of the polarizing film 50. A peeled film, that is, a release film 55 is laminated on one surface of the polarizing film 50 via an adhesive layer 54. When the release film 55 is peeled off, the release film 55 is peeled off from the adhesive layer 54. For example, a surface protective film 57 or the like may be laminated on the other surface of the polarizing film 50 via an adhesive layer 56. When the surface protective film 57 is peeled off, it is peeled off from the polarizing film 50 together with the adhesive layer 56.

  The optical film laminate strips 44a and 44b formed by cutting the optical film laminate 40 having such a structure into a predetermined width by the slitter 20 are cut in the width direction in a later step, and the sheet-like optical film laminate is formed. It is formed. The release film 55 of the obtained sheet-like optical film laminate is peeled from the adhesive layer 54, and the exposed surface of the adhesive layer 54 is bonded to the optical display panel to form an optical display device. Therefore, the optical display device as a product includes the adhesive layer 54 of the optical film laminate 40 as it is, and as described above, the state of the adhesive layer 54 affects the quality of the optical display device as a product. May affect.

  The problem with the state of the adhesive layer 54 is when local release of the release film 55 occurs. FIG.2 (b) shows the optical film laminated body 40 of the state in which local peeling of the release film generate | occur | produced when it slits using the technique of patent document 1, for example. Such local peeling of the release film is considered to be caused by the fact that the release film is pulled by the rotation of the cutter when the optical film laminate 40 is slit by the rotating circular cutter. When such local peeling occurs, when the release film is peeled off and the adhesive layer is bonded to the optical display panel, the boundary between the part where the release film has been peeled off and the close contact part around the part has been removed. There is a risk of streaks leading to defects in the optical display device.

[Slitter]
FIG. 3 is a schematic front view of the slitter 20 according to the embodiment of the present invention. The slitter 20 includes substantially cylindrical laminate support rollers 21, 22, 23, and 24 and first circular cutting blades 25, 26 provided between adjacent laminate support rollers 21, 22, 23, and 24, and 27, second circular cutting blades 32, 34 and 36 provided on the opposite side of the laminate support rollers 21, 22, 23 and 24 with respect to the optical film laminate 40, and the laminate support rollers 21, 22, And annular groove portions 28, 29, and 30 provided so as to continue in the circumferential direction from the outer peripheral surfaces 21f, 22f, 23f, and 24f of 23 and 24 to a predetermined depth.

(Laminate support roller)
The laminated body support rollers 21, 22, 23, and 24 are attached to a driving shaft 31 that rotates in the direction of the arrow by an external driving force, for example. It can rotate around a rotation axis orthogonal to the length direction. The laminated body support rollers 21, 22, 23, and 24 have outer peripheral surfaces 21f, 22f, 23f, and 24f, respectively. The release film 55 of the optical film laminate 40 is in contact with these outer peripheral surfaces 21f, 22f, 23f, and 24f over a predetermined length direction distance.

  In the illustrated embodiment, the slitter 20 is provided with four laminated body support rollers 21, 22, 23, and 24, but the configuration of the laminated body support roller is not limited to this. All or some of the two laminate support rollers 21, 22, 23 and 24 may be integrally formed. In the case of a plurality of laminated body supporting rollers, the number of laminated body supporting rollers can be appropriately determined according to the number of optical film laminated body strips generated from the wide optical film laminated body 40. it can. Further, the laminated body support rollers 21 and 24 at both ends are not necessarily provided, but by providing these, the optical film laminated body 40 is appropriately supported even at the slit positions at both ends, so that the slit accuracy is further improved. be able to.

  Each of the laminated body support rollers 22 and 23 can be configured by combining a plurality of members. For example, as shown in FIG. 3, the laminated body support roller 22 has a columnar member 22 a and a cylindrical member 22 cut out at the end, and the cutout portion is a part of a groove 28 described later. It can comprise by combining with the member 22b formed so that it may become. Similarly, the laminated body support roller 23 is formed such that a cylindrical member 23a and an end portion of the cylindrical member are cut out, and the cut-out portion becomes a part of a groove 29 described later. It can comprise by combining with the member 23b. Thus, by comprising the laminated body support rollers 22 and 23 with a plurality of members, the degree of freedom in adjusting the slit width can be increased, and the apparatus cost can be reduced.

  The length in the direction parallel to the rotation axis of each laminate support roller 21, 22, 23, and 24, that is, the length of the laminate support roller is appropriately determined according to the width of the optical film laminate strip to be generated. be able to. In the illustrated embodiment, the length of the laminate support roller 22 is set corresponding to the width of the optical film laminate strip 44a. Similarly, the length of the laminated body support roller 23 is set corresponding to the width of the optical film laminated body strip 44b. The length in the direction orthogonal to the rotation axis of each of the laminate support rollers 21, 22, 23, and 24, that is, the diameter of the laminate support rollers 21, 22, 23, and 24 should be appropriately set according to the rigidity and cost. Can do. That is, it is necessary to increase the diameter of the laminated body support rollers 21, 22, 23, and 24 in order to ensure rigidity as the length increases, and the rigidity increases as the diameter increases, but more than necessary. Increasing the size increases the weight and adversely affects handling and cost. Therefore, it is preferable to design the diameters of the laminated body support rollers 21, 22, 23, and 24 so that the minimum rigidity can be secured in relation to the length.

(First circular cutting blade)
In the embodiment shown in FIG. 3, between adjacent laminate support rollers, that is, between the laminate support roller 21 and the laminate support roller 22, and between the laminate support roller 22 and the laminate support roller 23. The first circular cutting blades 25, 26 and 27 are disposed between the laminated body support roller 23 and the laminated body support roller 24, respectively. In the illustrated embodiment, the first circular cutting blades 25, 26, and 27 are shown as disk-shaped blades, but are not limited thereto, and may be, for example, annular blades. it can. For example, in the case of an embodiment in which all or some of the laminate support rollers 21, 22, 23, and 24 are integrally formed, an annular blade is arranged in a groove provided in the laminate support roller. Can do.

  The first circular cutting blades 25, 26, and 27 rotate with the rotation of the drive shaft 31 and the laminated body support rollers 21, 22, 23, and 24, and second circular cutting blades 32, 34, and 36 described later. The optical film laminate 40 functions to be slit parallel to the length direction by the shearing force generated between the two.

  The distance between each of the first circular cutting blades 25, 26 and 27 is determined by the length of the laminate support rollers 22 and 23 set according to the width of the optical film laminate strip to be generated. That is, the width of the slit can be determined by changing the lengths of the laminate support rollers 22 and 23. Therefore, the laminate support rollers 22 and 23 function as a width determining spacer for determining the width of the slit. Will also have.

  In the illustrated embodiment, the first circular cutting blade 25 is disposed at a position where the edge 44c of the optical film laminate 40 is cut off. The first circular cutting blade 25 and the first circular cutting blade 26 are arranged so that the distance between them is a distance corresponding to the width of the optical film laminate strip 44a. Similarly, the 1st circular cutting blade 26 and the 1st circular cutting blade 27 are arrange | positioned so that the space | interval between them may become the distance corresponding to the width | variety of the optical film laminated body strip 44b. Further, the first circular cutting blade 27 is disposed at a position where the edge portion 44 d of the optical film laminate 40 is cut off.

  In the illustrated embodiment, the slitter 20 is configured to have three first circular cutting blades 25, 26, and 27, but the number of first circular cutting blades is limited to this. However, it can be determined as appropriate according to the number of optical film laminate strips to be produced.

  In the embodiment shown in FIG. 3, the diameter of the first circular cutting blades 25, 26 and 27 is equal to the diameter of the laminate support rollers 21, 22, 23 and 24. That is, the tips of the cutting edges of the first circular cutting blades 25, 26 and 27 are located on the same plane as the outer peripheral surfaces 21 f, 22 f, 23 f and 24 of the laminated body support rollers 21, 22, 23 and 24. By comprising in this way, the deflection | deviation of the optical film laminated body in a slit position reduces, while being able to improve a slit precision, it can prevent that the protrusion and notch | chip of an adhesive generate | occur | produce. However, the diameters of the first circular cutting blades 25, 26 and 27 are not limited to this, and may be smaller than the diameters of the laminated body support rollers 21, 22, 23 and 24. The tips of the cutting edges of the first circular cutting blades 25, 26, and 27 are positioned inside groove portions 28, 29, and 30 described later, respectively.

  The first circular cutting blades 25, 26 and 27 preferably have a thickness of about 0.5 mm to 5 mm. If it is too thin, the cutting edge may be damaged, or the cutting edge may be greatly deformed when slitting, which may adversely affect accuracy. If it is too thick, the rigidity is increased but the cost is increased. The thin first circular cutting blades 25, 26, and 27 have two stacked body supporting rollers adjacent to the blade edge as close to the blade edge as possible so as to improve the slit accuracy by suppressing the meandering of the blade edge during rotation. It is preferable that it is pressed down by the end face.

  The first circular cutting blades 25, 26, and 27 have an acute angle cutting edge formed with an acute angle. The angle of the acute blade edge is preferably 20 ° to 50 °. When the angle of the acute blade edge is smaller than 20 °, the uniformity of the cut surface shape of the optical film laminate strip is increased, but the durability of the first circular cutting blades 25, 26 and 27 is lowered, and the blade edge is easily chipped. There is a risk. If the angle of the acute blade edge exceeds 50 °, cracks and cracks are likely to occur on the cut surface.

  As shown in FIG. 3, the shape of the acute-angle cutting edges of the first circular cutting blades 25, 26, and 27 is preferably a single blade that is polished so that only one surface is inclined, but is not limited thereto. For example, a double-edged blade that is polished so that the surfaces on both sides are inclined may be used. However, when the sharp edge is double-edged, the cut surface of the optical film laminate strip is slanted, so that the uniformity of the shape of the cut surface at both ends of one strip or between the ends of different strips may be reduced. There is sex.

  As a material for the first circular cutting blades 25, 26, and 27, metal, ceramic, or the like can be used. Specifically, iron, iron alloy, tool steel, stainless steel and the like are preferable. In addition, a blade whose surface is treated with titanium nitride, titanium carbide, tungsten carbide or the like is preferable.

(Second circular cutting blade)
The slitter 20 has second circular cutting blades 32, 34 and 36 provided on the opposite side of the optical film laminate 40 from the laminate support rollers 21, 22, 23 and 24. Each of the second circular cutting blades 32, 34, and 36 is independently supported rotatably on the cutting blade bases 33, 35, and 37, and the first circular cutting blades 25, 26, and 27 can be rotated. It is designed to accompany you. However, the second circular cutting blades 32, 34 and 36 are attached to the same or different drive shafts, and this drive shaft is driven by the external driving force to the rotational speed of the first circular cutting blades 25, 26 and 27. You may comprise so that it may rotate with the same rotational speed.

  The second circular cutting blades 32, 34 and 36 are provided in the slitter 20 so that each of the cutting edges is arranged at a position corresponding to each of the cutting edges of the first circular cutting blades 25, 26 and 27. Yes. The cutting edge of the first circular cutting blade 25, the cutting edge of the second circular cutting blade 32, the cutting edge of the first circular cutting blade 26 and the cutting edge of the second circular cutting blade 34, and the cutting edge of the first circular cutting blade 27 And the edge of the second circular cutting blade 36 are configured to partially overlap each other, and the optical film laminate 40 includes the first circular cutting blades 25, 26 and 27 and the second circular cutting blade 32. , 34 and 36 will be slit by the shearing force. The overlap between the cutting edges of the first circular cutting blades 25, 26 and 27 and the cutting edges of the second circular cutting blades 32, 34 and 36, that is, D2 in FIG. 3 is preferably about 100 μm to 1,000 μm.

  In the illustrated embodiment, the slitter 20 is configured to have three second circular cutting blades 32, 34 and 36, but the number of second circular cutting blades is limited to this. The number of the first circular cutting blades may be the same as the number of the optical film laminate strips to be generated.

  The diameter of the second circular cutting blades 32, 34 and 36 is not limited, but is preferably equal to the diameter of the first circular cutting blades 25, 26 and 27. The thicknesses of the second circular cutting blades 25, 26 and 27 are preferably equal to the thicknesses of the first circular cutting blades 25, 26 and 27.

  The second circular cutting blades 32, 34, and 36 have an acute angle cutting edge formed with an acute angle. The angle of the acute blade edge is preferably 20 ° to 50 °. If the angle of the acute blade edge is smaller than 20 °, the uniformity of the cut surface shape of the optical film laminate strip is improved, but the durability of the second circular cutting blades 32, 34 and 36 is lowered, and the blade edge is easily chipped. There is a risk. If the angle of the acute blade edge exceeds 50 °, cracks and cracks are likely to occur on the cut surface.

  As shown in FIG. 3, the shape of the acute-angle cutting edges of the second circular cutting blades 32, 34, and 36 is preferably a single blade that is polished so that only one surface is inclined, but is not limited thereto. For example, a double-edged blade that is polished so that the surfaces on both sides are inclined may be used. However, when the sharp edge is a double-edged blade, the cut surface of the optical film laminate strip is inclined, so that the uniformity of the cut surface shape at both ends of one strip or between the ends of different strips may be reduced. There is. In order to make the end cut surface shape uniform in all the generated strips, the shape of the acute edge of the second circular cutting blades 32, 34 and 36 is the same as that of the first circular cutting blades 25, 26 and 27. More preferably, it has the same shape as that of the sharp edge.

  As a material for the second circular cutting blades 32, 34 and 36, metal, ceramic or the like can be used. Specifically, iron, iron alloy, tool steel, stainless steel and the like are preferable. In addition, a blade whose surface is treated with titanium nitride, titanium carbide, tungsten carbide or the like is preferable.

  In the slitter 20, the second circular cutting blades 32, 34 and 36 are configured to be able to move manually or automatically on the rotation axis in accordance with the positions of the first circular cutting blades 25, 26 and 27. It is preferable.

(Groove)
In the embodiment shown in FIG. 3, groove portions 28, 29, and 30 having a predetermined depth D1 in the rotation axis direction from the outer peripheral surfaces 22 f, 23 f, and 24 f are provided in the circumferential direction in the laminate support rollers 22, 23, and 24. It is provided in an annular shape so as to be continuous with. The groove portions 28, 29 and 30 are provided at positions where the first circular cutting blades 25, 26 and 27 and the second circular cutting blades 32, 34 and 36 overlap. Each blade edge of each of the second circular cutting blades 32, 34 and 36 is inserted into each of them.

  The width of the groove portions 28, 29 and 30, that is, the length of L1 shown in FIG. 3 is only required to be larger than the total value of the thickness of the first circular cutting blade and the thickness of the second circular cutting blade. It is preferably close to the total value. By making the widths of the grooves 28, 29 and 30 in this way, the optical film laminate 40 can be supported by the laminate support rollers 22, 23 and 24 as close as possible to the slit position. This can be further improved.

  The depth of the grooves 28, 29, and 30, that is, the length of D1 shown in FIG. 3, is the distance between the outer peripheral surfaces 22f, 23f, and 24f and the tips of the cutting edges of the second circular cutting blades 32, 34, and 36 (that is, The depth of the cutting edges of the second circular cutting blades 32, 34 and 36 may be larger than the depth D2), but is preferably as close to D2 as possible. When the depths of the grooves 28, 29 and 30 are made as shallow as possible in this way, the first circular cutting blades 25, 26 and 27 are pressed by the end faces of the laminated body support rollers 22, 23 and 24 to a position close to the cutting edge. The meandering of the cutting edge during rotation of the thin first circular cutting blade is suppressed, and the slit accuracy can be further improved.

  More preferably, the overlapping portion of the first circular cutting blades 25, 26, and 27 and the second circular cutting blades 32, 34, and 36 is located at a substantially midpoint of L1. By configuring the position of the overlapping portion in this way, the distance from the slit position to the position where the optical film laminate 40 is supported becomes substantially equal on both sides of the slit position, so that at the end of the optical film laminate strip. The uniformity of the shape of the cut surface can be further increased.

[Slit method]
Next, the slitting method using the slitter according to the present invention will be described together with the operation of the slit system 1 shown in FIG. 1 and the operation of the slitter 20 shown in FIG.
As shown in FIG. 1, in the slit system 1, a roll 42 of the optical film laminate 40 manufactured in advance in a separate process is rotatably installed on the support shaft 12. The web-like optical film laminate 40 fed from the roll 42 is fed in the length direction by the pair of feed rollers 13a and 13b, and enters the slitter 20 provided on the downstream side of the feed rollers 13a and 13b.

  FIG. 4 is a schematic view showing the slitter 20 of FIG. 3 as viewed from the left side. The web-like optical film laminate 40 at the time of slitting, the laminate support rollers 21, 22, 23 and 24, and the first It is a figure for demonstrating the relationship between the circular cutting blades 25, 26, and 27 and the 2nd circular cutting blades 32, 34, and 36. FIG. Since FIG. 4 is a diagram for explaining the relationship between the optical film laminate 40 and the slitter 20, the relative relationship between the thickness of the optical film laminate 40 and the size of each member of the slitter 20 is actual. Note that it is different from the device. Further, FIG. 4 shows one of a pair of feed rollers 13a provided in front of the slitter 20 with respect to the length direction of the optical film laminate 40 (that is, upstream in the feed direction of the optical film laminate 40). The guide roller 14 (corresponding to the upstream support roller in the claims) and the rear of the slitter 20 (that is, downstream in the feed direction of the optical film laminate 40) (claims in claims) Also corresponding to the downstream support roller in FIG. In the present embodiment, since the diameters of the first circular cutting blades 25, 26, and 27 are equal to the diameters of the laminated body support rollers 21, 22, 23, and 24, in FIG. It is drawn so that the outer periphery of the acute-angled blade edge coincides with the outer peripheral surface 21f of the laminated body support roller 21. In addition, the distance between the dotted line drawn on the laminated body support roller 21 in FIG. 4 and the outer peripheral surface 21 f represents the depth of the groove 28.

  In the slitter 20, the optical film laminate 40 sent by the feed rollers 13a and 13b has an outer periphery of the laminate support rollers 21, 22, 23 and 24 on the side of the release film 55 as shown in FIG. With the surfaces 21f, 22f, 23f, and 24f being in contact with each other at a predetermined length direction distance, the laminate support rollers 21, 22, 23, and 24 are fed in the length direction by the rotation in the arrow direction. Second circular cutting blades 32, 34, and 36 are arranged on the side of the optical film laminate 40 opposite to the release film 55 (in this embodiment, the optical functional film 50 side). The cutting edges of the first circular cutting blades 25, 26, and 27 partially overlap with the cutting edges of the second circular cutting blades 32, 34, and 36 (in this embodiment, the amount of overlap corresponds to D2). . Therefore, the optical film laminate 40 that is sent while being supported by the laminate support rollers 21, 22, 23, and 24 includes the cutting edges of the first circular cutting blades 25, 26, and 27 and the second circular cutting blade 32, It is slit by the shearing force generated between the cutting edges 34 and 36. In the present embodiment, the optical film laminate 40 includes two optical film laminates including three first circular cutting blades 25, 26 and 27 and three second circular cutting blades 32, 34 and 36. Slit into body strips 44a and 44b and edges 44c and 44d to be discarded.

  The optical film laminate 40 is supported in contact with the outer peripheral surfaces 21f, 22f, 23f, and 24f over a predetermined length direction distance. As shown in FIG. 4, the predetermined lengthwise distance is the length of a sector arc having θ as the central angle and the radius of the laminated body support rollers 21, 22, 23 and 24 as the radius. This angle θ is generally called a holding angle, and the holding angle θ is preferably larger than θ1. θ1 is two points on the outer periphery of the acute blade edge that intersect when the acute blade edges of the first circular cutting blades 25, 26, and 27 and the acute blade edges of the second circular cutting blades 32, 34, and 36 overlap, that is, The line segment connecting point U (point upstream on the optical film laminate 40 in the feeding direction) and point D (point downstream on the optical film laminate 40 feeding direction) in FIG. This is a sector central angle with the point O on the rotation axis of the support rollers 21, 22, 23 and 24 as the vertex O. In order to more stably support the optical film laminate 40 by the laminate support roller, the holding angle θ is more preferably greater than about 10 °.

  In the slitter 20, the optical film laminate 40 includes a laminate support roller such that the range in the length direction contacting the outer peripheral surfaces 21f, 22f, 23f, and 24f includes the above-described fan-shaped arc range having the central angle θ1. It is preferable to send while holding 21, 22, 23 and 24. That is, the optical film laminate 40 sent to the slitter 20 is in contact with the laminate support roller at a position upstream of the point U in the feed direction, and is separated from the laminate support roller at a position downstream of the point D in the feed direction. In addition, it is preferable to contact the laminated body support roller (in other words, the optical film laminated body is sent while being supported from a position upstream from the U point to a position downstream from the D point). In this state, the upstream support roller (the roller 13a in this embodiment) that supports the optical film laminate 40 on the upstream side of the slitter 20 and the downstream support roller that supports the optical film laminate 40 on the downstream side of the slitter 20 (In this embodiment, a guide roller 14) is provided, and these upstream side support rollers and downstream side support rollers are arranged in the positional relationship shown in FIG. 4 with respect to the laminate support rollers 21, 22, 23, and 24. It is realized by doing.

  In the embodiment shown in FIG. 4, the upstream support roller 13 a and the downstream support roller 14 are each one roller, and the optical film laminate supported by the laminate support rollers 21, 22, 23, and 24. The optical film laminate 40 is supported from the surface opposite to the surface 40. However, the number and contact direction of the upstream support rollers and the downstream support rollers are not limited to the embodiment shown in FIG. For example, both the upstream support roller and the downstream support roller may be configured by a pair of rollers such as rollers 13a and 13b, and the optical film laminate 40 may be supported from both sides.

  By slitting the optical film laminate 40 with the laminate support rollers 21, 22, 23, and 24 held in this manner, variations in the slit position can be suppressed, the slit accuracy can be improved, and local Peeling can be reliably suppressed. When the starting point of the longitudinal range where the optical film laminate 40 abuts on the outer peripheral surfaces 21f, 22f, 23f and 24f is a position upstream of the point U in FIG. 4, the optical film laminate at the starting point of the slit. The slit is started in a state where 40 is in contact with the outer peripheral surfaces 21f, 22f, 23f, and 24f, and the slit accuracy can be further improved. On the other hand, when the end point of the length direction range in which the optical film laminate 40 contacts the outer peripheral surfaces 21f, 22f, 23f, and 24f is a position downstream of the point D in FIG. The second circular rotary blades 32, 34, and 36 are withdrawn from the optical film laminate 40 while the optical film laminate strips 40a and 44b remain in contact with the outer peripheral surfaces 21f, 22f, 23f, and 24f. Thus, local peeling is more reliably suppressed.

  The optical film laminate 40 is held by the laminate support rollers 21, 22, 23, and 24 so that the release film 55 contacts the outer peripheral surfaces 21f, 22f, 23f, and 24f, and the second circular rotary blade 32, 34 and 36 are inserted into the optical film laminate 40 so as to penetrate the release film 55 from the optical functional film 50 side, whereby the second circular rotary blades 32, 34 and 36 across the adhesive layer are formed. Since the direction DB exiting from the optical film laminate 40 and the direction DF from which the release film 55 is peeled off from the adhesive layer 54 are opposite to each other, the local area of the release film 55 when the optical film laminate 40 is slit is reversed. Peeling can be reliably suppressed. Further, since the optical film laminate 40 is supported by the laminate support rollers 21, 22, 23, and 24 so that the release film 55 contacts the outer peripheral surfaces 21f, 22f, 23f, and 24f, the optical film laminate 40 is provided. A force is applied from the laminated body support rollers 21, 22, 23, and 24, and peeling can be reliably suppressed.

  Furthermore, since each of the first circular cutting blades 25, 26 and 27 and the second circular cutting blades 32, 34 and 36 has an acute angle cutting edge, slit optical film laminate strips 44a and 44b. It is possible to prevent the pressure-sensitive adhesive from sticking out or chipping at the end portion. Since the second circular cutting blades 32, 34 and 36 penetrate the optical film laminate, the sticking out or chipping of the adhesive is further effectively prevented. If the first circular cutting blades 25, 26, and 27 and the second circular cutting blades 32, 34, and 36 have the same sharp edge, the end portions of the slits of the optical film laminates 44a and 44b that are slit are further provided. The shape of the cut surface can be made uniform.

  Returning to FIG. 1, the plurality of optical film laminate strips 44a, 44b, 44c and 44d exiting the slitter 20 are then fed in different directions. The optical film laminate strip 44 a is sent in the length direction by the pair of feed rollers 15 a and 15 b via the guide roller 14, and is taken up by the roll 46 of the optical film laminate strip by the take-up shaft 17. Similarly, the optical film laminate strip 44b is guided in a direction different from the strip 44a by the pair of feed rollers 16a and 16b, preferably via the guide roller 14, and the optical film laminate strip is taken up by the winding shaft 18. The roll 48 is wound up. The edges 44c and 44d are wound around another winding shaft (not shown) and discarded.

  In the above-described embodiment, if the first circular cutting blades 25, 26, 27 and the second circular cutting blades 32, 34, 36 are arranged at equal intervals, two laminate strips having the same width can be obtained. . Further, if two first circular cutting blades 25, 26, 27 and two second circular cutting blades 32, 34, 36 are used, one laminate strip can be obtained.

  Specific examples of the present invention are described below, but the present invention is not limited to these examples.

(Evaluation method)
Table 1 shows the evaluation items when the optical film laminate strip is formed using the slitters of Examples and Comparative Examples. Evaluation is based on the evaluation method and evaluation index shown in Table 1 for the slit accuracy of the formed optical film laminate strip, the uniformity of the left and right cut surfaces, the sticking or chipping of the adhesive, and the local peeling of the release film. Based on. Table 2 shows the structure of the apparatus used as an Example and a comparative example.

Example 1
In the slitter of Example 1, a laminated body support roller having a diameter of an outer peripheral surface with which the optical film laminated body abuts is 98 mm and having four groove portions, and each of the four groove portions has the same diameter as the diameter of the outer peripheral surface. The first circular cutting blade was provided. A second circular cutting blade having the same diameter as that of the first circular cutting blade was provided at a position corresponding to each of the first circular cutting blades. Therefore, the slitter of Example 1 is provided with 4 sets of 1st and 2nd circular cutting blades. The cutting edges of the first and second circular cutting blades are both sharp edges, and the angles of the cutting edges are both 40 degrees. The distance between adjacent first circular cutting blades was 400 mm each. The material of the first and second circular cutting blades was a cemented carbide material.

  The web-shaped optical film laminate having a width of 1,330 mm is brought into contact with the outer peripheral surface of the laminate support roller in the slitter of Example 1, and the distance between adjacent circular cutting blades is set by the first and second circular cutting blades. Three corresponding optical film laminate strips with a width of 400 mm were formed. As the optical film laminate, Nitto Denko Corporation (product name: NZBEFTMEQT-SU68) having a polarizing film and a release film and a surface protective film with adhesive layers on both sides thereof was used. The thickness of the polarizing film was 215 μm, the thickness of the release film laminated on one side of the polarizing film was 38 μm, and the thickness of the surface protective film laminated on the opposite side was 38 μm. The release film was in contact with the outer peripheral surface of the laminated body support roller. The conveyance speed of the film and the rotational speed of the circular cutting blade were 100 m / min. The length distance by which the web-shaped optical film laminate abuts on the outer peripheral surface of the laminate support roller was 68.4 mm, and the holding angle was 80 degrees.

(Example 2)
In the slitter of Example 2, the distance in the length direction where the optical film laminate and the outer peripheral surface of the laminate support roller contact each other was 12.8 mm (holding angle 15 degrees). The other conditions were the same as in Example 1.

(Example 3)
In the slitter of Example 3, the diameter of the 1st circular cutting blade was made smaller than the diameter of a laminated body support roller. The diameter of the first circular cutting blade was 96 mm. The other conditions were the same as in Example 1.

(Comparative Example 1)
The slitter of Comparative Example 1 does not have a laminate support roller, and includes a first circular cutting blade disposed on one side of the optical film laminate and a second circular cutting blade disposed on the other surface side. The optical film laminate was slit. The other conditions were the same as in Example 1.

(Comparative Example 2)
The slitter of the comparative example 2 was provided with the laminated body support roller which has four groove parts, and comprised the outer peripheral part of the laminated body support roller edge part which faces a groove part as a 1st cutting blade (edge blade). Therefore, the angle of the cutting edge of the first cutting blade is 90 degrees. The second cutting blade was provided at a position corresponding to the first cutting blade (edge blade). The other conditions were the same as in Example 1.

(Comparative Example 3)
The slitter of Comparative Example 3 includes a laminated body support roller having four groove portions, but is not provided with the first cutting blade. The second circular cutting blade is provided at a position corresponding to the four groove portions on the opposite surface side across the optical film laminate, so that the cutting edge of the second circular cutting blade enters the groove portion. . The other conditions were the same as in Example 1.

(Comparative Example 4)
In the slitter of the comparative example 4, it was comprised so that not a release film but a surface protection film might contact | abut on the outer peripheral surface of a laminated body support roller. The other conditions were the same as in Example 1.

(Evaluation results)
Table 3 shows the results of evaluating the formed optical film laminate strips based on the items in Table 1, using the slitters of Examples 1 to 3 and Comparative Examples 1 to 4.
For Example 1, an optical film laminate strip with high slit accuracy and uniform left and right cut surfaces was obtained. Neither protruding or chipping of the adhesive nor local peeling of the release film occurred.

  In Example 2, compared with Example 1, the slit accuracy was slightly lowered although the required accuracy was maintained. This is because the optical film laminate contact with the laminate support roller has a short distance in the length direction (the holding angle is small), and the stability effect of the cut portion due to the film being supported by the roller is reduced. Conceivable. As for the local peeling of the release film, peeling with a size of 500 μm or more was not observed, and only peeling having no practical problem occurred. The left and right cut surface shapes were uniform, and the adhesive did not protrude or chipped.

  The slit accuracy in Example 3 also slightly decreased. This is because the diameter of the first cutting blade was smaller than the diameter of the laminated body support roller, and the optical film laminate was pushed by the second cutting blade during cutting. The reason is considered. The reason why the pressure-sensitive adhesive protrudes or lacks is considered to be the same. However, the left and right cut surface shapes were uniform, and local peeling of the release film did not occur.

  Since the comparative example 1 is a structure which does not have a laminated body support roller, it was slit in the state which floated in the air, without supporting an optical film laminated body in a slit position. Therefore, fluttering of the slit position occurred and the slit accuracy was greatly reduced. Further, since the film was shaken at the time of slitting, the sticking out or chipping of the adhesive and local peeling of the release film occurred.

  In Comparative Example 2, since the shape of the first cutting blade and the shape of the second cutting blade were different, the shapes of the left and right cut surfaces were clearly different. FIG. 5 is a diagram comparing Example 1 (a) and Comparative Example 2 (b) with respect to the shapes of the left and right cut surfaces. FIG. 5A is a photograph of the ends of two adjacent strips 1 and 2 after being slit by a circular cutting blade having an acute edge, and FIG. 5B is an acute angle on the strip 1 side. It is a photograph of the edge part of two adjacent strips 1 and 2 after the circular cutting blade which has a blade edge | tip was provided, and it was slit by the slitter with which the edge blade was provided in the strip 2 side. It can be seen that the cut surfaces of Comparative Example 2 are clearly different in shape on the left and right.

  In Comparative Example 3, although the slit position was supported by the laminate support roller, the second cutting blade slit while pushing the optical film laminate, resulting in poor slit accuracy. Moreover, since the film was pushed in, the sticking out of the adhesive or chipping occurred.

  Comparative Example 4 is a configuration in which the optical film laminate is slit in a state where the surface protective film is in contact with the outer peripheral surface of the laminate support roller, not the release film, but local release of the release film occurs. did. This is because the slitter of Comparative Example 4 is not configured such that the release film side is wound around the laminate support roller, and no force is applied from the laminate support roller to the release film side. It is considered that the reason is that the second cutting blade located at the end penetrates the optical film laminate and the adhesive layer was pulled at that time.

10 Slitter system 12 Support shaft 13a Feed roller (upstream support roller)
13b Feed roller 14 Guide roller (downstream support roller)
15, 16 Feed rollers 17, 18 Winding shaft 20 Slitter 21, 22, 23, 24 Laminate support rollers 25, 26, 27 First circular cutting blades 28, 29, 30 Groove 31 Drive shafts 32, 34, 36 First Two circular cutting blades 40 Optical film laminates 42, 46, 48 Roll 44 Optical film laminate strip 50 Polarizing film 51 Polarizers 52, 53 Protective films 54, 56 Adhesive layer 55 Release film 57 Surface protective film

Claims (7)

It includes a web-like optical functional film and a web-like release film laminated on one side of the optical functional film via an adhesive layer, and can be peeled off at the interface between the release film and the adhesive layer. An apparatus for forming a plurality of optical film laminate strips by slitting a configured optical film laminate in parallel with a length direction,
An outer peripheral surface arranged so that the release film of the optical film laminate contacts, and a plurality of grooves provided to be continuous in the circumferential direction at any position of the outer peripheral surface, A laminate support roller that rotates about a rotation axis parallel to the width direction of the optical film laminate;
A plurality of first circular cutting blades having the same number as the number of the groove portions, each having an acute angle blade edge, and attached to the laminate support roller so that each of the acute angle blade edges is located inside the plurality of groove portions. When,
Each of the sharp cutting edges of the plurality of first circular cutting blades has an acute cutting edge, and each of the acute cutting edges is opposite to the plurality of first cutting blades with respect to the optical film laminate. A plurality of second circular cutting blades provided to be disposed at positions corresponding to each of the plurality of first circular cutting blades and slitting the optical film laminate in cooperation with the plurality of first circular cutting blades;
With
The optical film laminate has two points on the outer periphery of two acute angle cutting edges that intersect when the acute angle cutting edge of the first circular cutting blade and the acute angle cutting edge of the second circular cutting blade overlap each other. The optical film laminate is in contact with the laminate support roller at a position upstream from the point upstream in the feed direction, and is separated from the laminate support roller at a position downstream of the point downstream of the feed direction among the two points. As described above, the apparatus abuts on the laminated body support roller.   An upstream support roller disposed so as to support the optical film laminate upstream of a position where the optical film laminate contacts the laminate support roller, and the optical film laminate separates from the laminate support roller. The apparatus according to claim 1, further comprising a downstream support roller disposed so as to support the optical film laminate downstream of the position.   The shape of the acute angle cutting edge of the plurality of first circular cutting blades and the acute angle cutting edge of the plurality of second circular cutting blades are the same. Equipment.   3. The apparatus according to claim 1, wherein tips of the acute angle cutting edges of the plurality of first circular cutting blades are located on the same plane as the outer peripheral surface of the laminated body support roller. . It includes a web-like optical functional film and a web-like release film laminated on one side of the optical functional film via an adhesive layer, and can be peeled off at the interface between the release film and the adhesive layer. A method of forming a plurality of optical film laminate strips by slitting the configured optical film laminate in parallel with the length direction,
An outer peripheral surface arranged so that the release film of the optical film laminate contacts, and a plurality of grooves provided to be continuous in the circumferential direction at any position of the outer peripheral surface, A step of feeding the optical film laminate in the length direction while supporting the surface side of the release film by a laminate support roller rotating around a rotation axis parallel to the width direction of the optical film laminate;
A plurality of first circular cutting blades having the same number as the number of the groove portions, each having an acute angle blade edge, and attached to the laminate support roller so that each of the acute angle blade edges is located inside the plurality of groove portions. Each having an acute angle cutting edge, and each of the acute angle cutting edges is opposite to the plurality of first circular cutting blades with respect to the optical film laminate. Slitting the optical film laminate in cooperation with a plurality of second circular cutting blades provided so as to be arranged at positions corresponding to the respective acute angle blade edges;
Only including,
In the step of feeding the optical film laminate in the length direction, the optical film laminate is obtained when the acute angle cutting edge of the first circular cutting blade and the acute angle cutting edge of the second circular cutting blade overlap each other. From the position upstream of the point on the upstream side in the feed direction of the optical film laminate from the two points on the outer circumference of the two acute angle cutting edges that intersect, to the position downstream of the point in the feed direction downstream of the two points, A method characterized in that it is supported . Wherein the at least one plurality of first said sharp cutting edge of the said acute angle edge of the circular cutting blade at least one more second circular cutting blade, wherein the shape is the same, according to claim 5 the method according to. The step of slitting the optical film laminate is a state in which the tip of the acute angle cutting edge of the at least one first plurality of circular cutting blades is located on the same plane as the surface on which the optical film laminate is supported. 6. A method according to claim 5 , characterized in that it comprises slitting.