TW201600337A - Apparatus and method of forming optical film laminate strip - Google Patents

Abstract

The present invention relates to an apparatus and method of forming optical film laminate strip which can simultaneously enhance the strip cutting accuracy of the wide band optical film laminate and the uniformity of the cut section shape at the end portion of the stripped optical film laminate. This apparatus comprises: a laminate supporting roller having an outer peripheral surface brought into contact with the optical film laminate and a plurality of grooves disposed on the outer peripheral surface; a plurality of first circular cutting blades, each having an acute cutting blade and mounted to the laminate supporting roller in a manner of locating in the interior of the plural grooves; and a plurality of second circular cutting blades each having an acute cutting blade, disposed relative to the optical film laminate, and configured in an manner of locating at the corresponding positions opposite to the plural first cutting blades.

Description

Apparatus and method for forming optical film laminate sheets

The present invention relates to an apparatus and method for cutting a strip-shaped optical film laminate into a suitable size and forming an optical film strip.

An optical functional film such as a polarizing film or a retardation film is bonded to an optical display panel via an adhesive layer, and is used as an optical component of an optical display device. The optical functional film of the present invention is generally formed by cutting a strip-shaped optical film laminate including a release film and an adhesive layer and an optical functional film into a rectangular shape to form a sheet-like optical film layer. The integrated body is obtained by peeling off the release film from the laminate and attaching the adhesive layer. The strip-shaped optical film laminate of a specific wide strip is cut by a specific width in parallel with the longitudinal direction thereof by a strip-shaped optical film laminate having a wider width and wider width And formed. In the present specification, the wide-width strip-shaped optical film laminate is cut in parallel with the longitudinal direction, and is referred to as a slit, and a device for cutting the strip is used. , called the slitter.

For example, a technique described in Patent Document 1 (JP-A-2006-289601) is proposed as a method for cutting a wide-width strip-shaped optical film laminate. This technique is a circular blade disposed at one side of one side of the optical film laminate and another circular blade disposed at a position corresponding to the circular blade at the other side. In the meantime, the strip-shaped optical film laminate is moved, whereby a strip-shaped method of forming a plurality of strip-shaped optical film laminates having a specific width can be formed.

However, in this slitting method, since the optical film stratification system is not supported at the slit position and becomes a state of floating in the air, the deviation of the slit position occurs, and it is difficult to improve the precision of the slit. Degree problem. Here, the term "cutting accuracy" refers to the actual measured value and target of the width of the obtained strip-shaped optical film laminate when the strip-shaped optical film laminate is wide-width-width-cut. The degree of deviation in the length direction of the difference between the values, the so-called cutting accuracy is high, which means that the deviation is small. The improvement of the accuracy of the cutting strip has become an important issue especially in optical display devices in recent years. In recent years, the optical display device has been progressing in miniaturization, thinning, and weight reduction. Accordingly, the narrowing of the periphery of the display region, that is, the narrow frame system, is progressing. With the improvement of the requirements for the narrow frame, the accuracy of the correctness of the bonding position between the display panel and the optical functional film of the optical display device is required to be higher, in order to improve the fitting accuracy. In order to improve the cutting accuracy of the strip-shaped optical film laminate, it becomes important.

Further, in recent years, at the manufacturing site of an optical display device, a roll-to-panel (RTP) method has been gradually adopted. The RTP method is to feed a wide strip-shaped optical film laminate corresponding to the long side or the short side of the optical display device from a roll, and to feed the strip-shaped optical film laminate to be optical. The interval between the short side or the long side of the sexual display device is continuously cut in the width direction, and the generated sheet-like optical film is continuously attached to the optical display panel, thereby An optical display device is manufactured. In this technique, after the release film is peeled off from the sheet-like optical film laminate, an optical functional film having an adhesive layer is bonded to the optical display panel. In this RTP mode, the accuracy of the slitting is directly affected by the accuracy of the fit. However, in the slitting method which is difficult to improve the cutting accuracy as in the patent document 1, there is a limit to the improvement of the fitting accuracy in the RTP method.

As a technique for improving the accuracy of the cutting, for example, there is a technique described in Patent Document 2 (JP-A-2005-230968). This technique is a method in which one side of a plastic film is supported by a roller with a groove, and the film is cut by a blade disposed at a position corresponding to the groove on the other side of the film. . In this slitting method, since the film is cut while being abutted on the outer peripheral surface of the roller, there is an advantage that the slit position is supported by the outer peripheral surface and becomes stable.

However, in the general slitting method described in Patent Document 2, since the force is applied from only one side to the film, Therefore, the cutting accuracy is only slightly improved compared to the general cutting method described in Patent Document 1, and the accuracy required in the narrow frame technique and the RTP method cannot be obtained. .

As a technique for improving the accuracy of the cutting, for example, the technique described in Patent Document 3 (JP-A-2012-71414) is also proposed. The technique is to support one side of the plastic film by a groove having a groove and the peripheral edge portion is formed as a blade, and is disposed on the edge of the edge portion by being disposed on the other side of the film. The blade at the position and the edge of the edge portion are used to cut the film. In this slitting method, since the film is supported by the roller at a position very close to the cutting position, the cutting accuracy can be improved as compared with the cutting method described in Patent Document 2. .

However, in the general technique described in Patent Document 3, since the shape of the blade on one side of the film and the shape of the blade on the other side are different, the end of the film which is cut into strips is cut. The cross-sectional shape may become non-uniform at both ends of the same film or between different films. This kind of inhomogeneity is a situation that has an adverse effect on the accuracy of the fit. In this regard, in the techniques described in Patent Document 1 and Patent Document 2, the shape of the cut surface at the end portion of the film can be made uniform, but as described above, the accuracy of the cut strip exists. Question.

Further, as a technique for improving the accuracy of the cutting, for example, the technique described in Patent Document 4 (JP-A-61-184690) is proposed. This technology is related to having a circular blade that will make a pair The cutting edge has a cutting device of a structure in which the cutting blade and the feeding roller of the cut sheet material are disposed on the same axis.

This technique has the advantage of being able to cut the cutting accuracy by cutting the sheet material to be cut from both sides by a roller, but it is advantageous in that one or both of them are Since the blade protrudes outward from the outer peripheral surface of the roller, it is difficult to feed the paper without causing damage to the cut sheet material, and the workability is extremely poor.

As in the above, in the prior art, it is desirable to achieve the improvement of the cutting accuracy of the wide-width strip-shaped optical film laminate without sacrificing workability and the strip-shaped optical film which is cut into strips. It is difficult to improve the uniformity of the shape of the cut surface at the end portion of the laminate. However, in consideration of the promotion of the narrow frame and the introduction of the RTP method, it is extremely important to achieve the improvement of the cutting accuracy and the uniformity of the shape of the cut surface without sacrificing workability. .

Further, in addition to the problem of the accuracy of the cutting and the uniformity of the shape of the cut surface, it is necessary to further consider the problem of the excess or deficiency of the adhesive and the peeling of the locality of the release film. The excess or deficiency of the adhesive at the cut surface is caused by, for example, a film which is pressed into the film by a blade as in the technique described in Patent Document 2, etc., which is generally formed when the strip is cut. Caused by deformation. When a film having an excess or a lack of an adhesive is generated, there is a problem that the surface of the film is dirty, and foreign matter is mixed when the substrate is attached. Also, the film of the release film The partial peeling is performed, for example, when a wide-width optical film laminate is cut by a rotating circular blade using the technique described in Patent Document 1, in the release film and the adhesive layer. Partial peeling occurs between them. It is presumed that the local peeling is mainly caused by the fact that the release film is pulled toward the direction of rotation of the blade when the strip of the strip-shaped optical film laminate is cut. In such an optical film laminate which produces localized peeling, when the release film is peeled off and the adhesive layer is attached to the optical display panel, there is a portion where the release film has been peeled off and its surroundings. The rib-like streaks appear at the boundary between the mutually adhered portions, or the water intrudes into the peeled portion, resulting in a defective occurrence of the optical display device.

A technique for solving the problem of peeling at the time of cutting of an optical film is proposed in Patent Document 5 (JP-A-2010-76081). This technique is directed to a resin sheet with a protective film provided with a protective film on both sides of the front surface of the resin sheet, and a slit is formed at a specific depth from the front side of the resin sheet, and is made from the back side. When the rotary blade enters the position deeper than the incision and cuts the resin sheet, it is possible to prevent the protective film from floating upward without causing burrs on the cut surface.

However, in the technique of Patent Document 5, as in the technique described in Patent Document 1, there is a limit in the improvement of the cutting accuracy, and it is difficult to simultaneously achieve the improvement of the cutting accuracy and the shape of the cut surface. The improvement of uniformity.

Further, in the technique of Patent Document 5, it is used as a slit On both sides of the front and back sides of the resin sheet of the object, an adhesive layer and a protective film are laminated in the same order from the side of the resin sheet. In other words, this technique is to laminate a protective film with an adhesive layer which is formed symmetrically with respect to the resin sheet on both sides of the front surface of the resin sheet, and is in the resin at both sides. The optical film laminate formed by peeling off the interface between the sheet and the adhesive layer is the object of slitting. Therefore, this technology is directed to an optical film laminate which is the object of the slitting of the present application, that is, an optical film laminate in which an adhesive layer and a release film are laminated on at least one side of the optical functional film, Or an asymmetric optical film laminate in which at least an adhesive layer and a release film are laminated on one side of the optical functional film and asymmetrical structure is laminated on the other side with respect to the optical functional film. The body is difficult to suppress the local peeling between the adhesive layer and the release film.

As a technique in other technical fields, Patent Document 6 and Patent Document 7 disclose a slitter for slitting a paper tape. The slitting machine of the present invention is provided with a rotary cutting blade disposed at one side of the paper tape, and a rotary cutting cylinder disposed at the other side of the paper tape, which is set at the rotary cutting cylinder There is an annular barrel that engages with the rotary cutting edge. As a target of such a slit, it is not an asymmetric strip-shaped optical film laminate, but a single-layer or multi-layer paper strip. The techniques described in these documents are intended to be solved in order to suppress the occurrence of cutting failure and dust generation due to tearing of paper fibers. Therefore, of course, for layers and layers. The problem of localized peeling between the tube, the blade, and the roller to suppress the problem The arrangement relationship between the device components and the belt body is not considered at all.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Special Open 2006-289601

[Patent Document 2] Japanese Special Opening 2005-230968

[Patent Document 3] Japanese Special Opening 2012-71414

[Patent Document 4] Japan Shikai Show 61-184690

[Patent Document 5] Japanese Special Open 2010-76081

[Patent Document 6] Japanese Special Open Citation 54-11583

[Patent Document 7] Japanese Patent Laid-Open No. 55-144990

The object of the present invention is to provide an improvement in the accuracy of cutting of a strip-shaped optical film laminate having a wide width and a lamination of a strip-shaped optical film which has been slit, in accordance with the above problems. The uniformity of the shape of the cut surface at the end of the body, and the slitting apparatus and method capable of suppressing the excess or deficiency of the adhesive and the local peeling of the release film at the time of cutting.

In the first aspect, the present invention provides an apparatus for forming a plurality of optical film laminate sheets by cutting an optical film laminate in parallel with a longitudinal direction thereof, the optical film laminate And a strip-shaped optical functional film comprising a strip-shaped release film laminated on one side of the optical functional film via an adhesive layer, and configured to be capable of being disposed on the release film and the adhesive layer Peeling is performed at the interface between them. The present invention includes a laminate supporting roller, and is provided with a peripheral surface disposed so as to contact the release film of the optical film laminate, and at any position on the outer peripheral surface. a plurality of groove portions provided in a continuous manner in the circumferential direction and rotating around a rotation axis parallel to the wide direction of the optical film laminate; and a plurality of first circular cutting edges are respectively provided There is an acute-angled edge edge, and is attached to the laminated body supporting roller so that each of the acute-angled edge is positioned inside the corresponding groove portion of the plurality of grooves. Further, the device includes a plurality of second circular cutting edges, each of which has an acute-angled edge, and each of the acute-angled edges is opposed to the optical film laminate. The first cutting edge is disposed on the opposite side of the first cutting edge so as to be disposed at a position corresponding to each of the acute sharp edge of the plurality of first cutting edges, and the plurality of first circular cutting edges The optical film laminate is cut in concert. The optical film laminate is an acute-angled edge that intersects each other when the acute-angled edge of the first circular cutting edge and the acute-angled edge of the second circular cutting edge overlap each other. At a position further upstream of a point on the upstream side in the feeding direction of the optical film laminate in the outer periphery, the first embodiment is connected to the laminated body supporting roller and is downstream of the feeding direction of the two points. side At a further downstream position, the laminate support roller is abutted from the manner in which the laminate supports the roller. The optical film laminate and the laminate support the abutting state of the roller. According to one embodiment of the present invention, the optical film laminate can be connected to the laminated support roller. The upstream side support roller disposed at the upstream side in a manner supporting the optical film laminate, and the downstream side at a position away from the position where the optical film laminate is separated from the laminate support roller to support the optical film The downstream side of the layered body is configured to support the roller to achieve this. According to this device, by increasing the distance in the longitudinal direction of the optical film laminate on the outer peripheral surface (increasing the angle of enveloping), it is possible to obtain a cut-off precision and a cut surface. The uniformity of the shape is an excellent optical film laminate sheet. Further, according to this device, since the strip film is cut in a state where the mold release film side is supported by the outer peripheral surface, local peeling of the release film can be suppressed.

According to one embodiment of the present invention, it is preferable that the acute-angled edge of the plurality of first circular cutting edges and the sharp-edged edge of the plurality of second circular cutting edges have the same shape. According to this apparatus, it is possible to obtain an optical film laminate sheet having the same shape of the cut surfaces of the left and right end portions.

According to one embodiment of the present invention, it is preferable that the front end of the acute-angled edge of the plurality of first circular cutting edges is on the same surface as the outer peripheral surface of the laminated body supporting roller. According to this device, at the strip cutting position, since the deflection of the optical film laminate due to the press-in of the cutting blade does not occur, a slit can be obtained. An optical film laminate strip that is more precise and does not suffer from excess or deficiency of the adhesive.

In a second aspect, the present invention provides a method of forming a plurality of optical film laminate sheets by cutting an optical film laminate in parallel with a longitudinal direction thereof, the optical film laminate And a strip-shaped optical functional film comprising a strip-shaped release film laminated on one side of the optical functional film via an adhesive layer, and configured to be capable of being in the above-mentioned release film and the aforementioned Peeling is performed at the interface between the adhesive layers. The method includes the step of feeding the optical film laminate toward the longitudinal direction while supporting the surface of the release film of the optical film laminate, and cutting the first circular shape by a plurality of The optical film laminate is subjected to a slitting process in cooperation with the second circular cutting edge of the plurality of cutting edges, and the plurality of first circular cutting edges are respectively provided with acute sharp edges and are arranged At the side of the surface supporting the optical film laminate, the plurality of second circular cutting edges each have an acute-angled edge, and each of the sharp-edged edges is opposed to the optical film laminate. It is disposed so as to be disposed at a position corresponding to each of the acute sharp edge of the plurality of first circular cutting edges on the side opposite to the plurality of first cutting edges. According to this method, it is possible to obtain an optical film laminate sheet in which the cutting accuracy is high and the uniformity of the shape of the cut surface is excellent. Further, according to this method, since the strip film is cut in a state where the mold release film side is supported by the outer peripheral surface, local peeling of the release film can be suppressed.

10‧‧‧Scissor system

12‧‧‧ Support shaft

13a‧‧‧ Feeding roller (upstream side support roller)

13b‧‧‧feeding wheel

14‧‧‧ Guide roller (downstream side support roller)

15, 16‧‧‧ Feeding roller

17, 18‧‧‧Winding shaft

20‧‧‧cutting machine

21, 22, 23, 24‧‧‧ layered support roller

25, 26, 27‧‧‧1st circular cutting edge

28, 29, 30‧‧‧

31‧‧‧Drive shaft

32, 34, 36‧‧‧2nd circular cutting edge

40‧‧‧Optical film laminate

Volume 42, 42, ‧ ‧

44‧‧‧Optical film laminate strips

50‧‧‧ polarizing film

51‧‧‧Polarized components

52, 53‧‧‧ Protective film

54, 56‧‧‧ adhesive layer

55‧‧‧ release film

57‧‧‧Surface protection film

Fig. 1 is a perspective view showing an outline of a slitting system including a slitter of one embodiment of the present invention.

[Fig. 2] (a) is a configuration example of an optical film laminate which is a target of a slit in the slitter of one embodiment of the present invention, and (b) is for the optical film layer. The product is cut by a prior art slitting machine, and a partial peeling state is produced at the release film.

Fig. 3 is a front elevational view showing the outline of a slitter of one embodiment of the present invention.

[Fig. 4] is a view from the right side of the cutting machine and the feeding roller and the guiding roller shown in Fig. 3, and is used for the optical film laminate and layer at the time of cutting. A schematic diagram of the relationship between the integrated support roller and the first circular cutting edge and the second circular cutting edge, and the feed roller (upstream side support roller) and the guide roller (downstream side support roller) will be described.

[Fig. 5] is a case where the optical film laminate is cut by a slitter according to one embodiment of the present invention (Example 1) and the shape of the first cutting blade and the second A comparison of the shapes of the cut faces when the optical film laminate was cut (Comparative Example 2) was made in the prior art in which the shape of the cutting blade was different.

Hereinafter, a device for forming an optical film laminate strip and a method for forming the same will be described in detail with reference to the drawings.

[Summary of the cutting system]

Fig. 1 is a perspective view showing an outline of a slitting system 10 having a slitter 20 having one embodiment of the present invention. Further, Fig. 3 is a front view showing an outline of a slitter 20 of one embodiment of the present invention.

In the illustrated slitting system 10, an optical display device is produced by attaching an optical functional film to an optical display panel having a rectangular shape having long sides and short sides, for example, via an adhesive layer. For the manufacture, a slitting machine 20 for stripping the strip-shaped optical film laminate 40 into a suitable width is provided. The slitting machine 20 is configured to cut a wide-width strip-shaped optical film laminate 40 parallel to the longitudinal direction to produce a plurality of specific widths corresponding to the size of the optical display panel. Optical film laminate strips.

In the slitting system 10, the roll 42 of the optical film laminate 40 is rotatably supported at the support shaft 12. The optical film laminate 40 that has been fed from the roll 42 is fed in the longitudinal direction by a pair of feed rollers 13a and 13b. The slitting machine is disposed behind the feeding rollers 13a and 13b with respect to the longitudinal direction of the optical film laminate 40 (that is, on the downstream side in the feeding direction of the optical film laminate 40). 20. The slitter 20 is provided with a laminate support roller 21, 22, 23, and 24 for abutting the optical film laminate 40, and a first circular cutting edge 25, as shown in FIG. 26 and 27, and the second circular cutting edges 32, 34 and 36, and the optical film laminate 40 is parallel to the length The optical film laminate sheets 44a to 44d having a specific width are formed by cutting in the lateral direction. The optical film laminate sheet 44a fed from the slitter 20 is fed toward the longitudinal direction by the pair of feed rollers 15a and 15b via the guide roller 14, and is supported by the roll. The roll 46 on the shaft 17 is taken up. Similarly, the optical film laminate strip 44b is fed toward the longitudinal direction by the pair of feed rollers 16a, 16b via the guide roller 14, and is supported on the take-up shaft 18. Volume 48 is taken. The optical film laminate 40 is surrounded by the laminated body supporting rollers 21, 22, 23, and 24 of the slitter 20 at a specific surrounding angle as will be described later using FIG. It is cut into strips. The optical film laminate sheets 44c and 44d are edge portions which are usually cut and discarded, and are taken up by a take-up shaft (not shown).

[Optical film laminate]

The optical film laminate of the slitting machine of the present invention can be formed by sequentially laminating an adhesive layer and a release film on one side of the optical functional film and not being layered on the other side. An optical film laminate having any material, or an adhesive layer and a release film may be sequentially laminated on one side of the optical functional film and laminated on the other side with respect to optical function An optical film laminate of members which are asymmetrically formed by a film. That is, in the optical film laminate which is the object of the slitting in the present invention, the members laminated on both surfaces of the optical functional film are asymmetric, and are laminated on one side thereof. The mold film and the adhesive layer are configured to be peelable from each other at the interface between the two. again In the optical film laminate of the object of the present invention, the optical functional film contained in the laminate is laminated by the same adhesive layer contained in the laminate. Other components such as a liquid crystal display panel. Therefore, since the adhesive layer contained in the optical film laminate is contained in the product while maintaining the original state, in the case of the laminate, the locality generated when cutting is performed. The presence or absence of peeling may affect the yield of the product.

Fig. 2 (a) is a configuration example of an optical film laminate 40 which is a target of a slitting machine 20 of one embodiment of the present invention. The optical film laminate 40 includes a polarizing film 50 in which a polarizing element 51 and protective films 52 and 53 are laminated. The optical film laminate 40 may be another optical functional film including, for example, a retardation film instead of the polarizing film 50. On one of the polarizing films 50, a film which has been subjected to a release treatment, that is, a release film 55, is laminated via the adhesive layer 54. When the release film 55 is peeled off, the release film 55 is peeled off from the adhesive layer 54. On the other surface of the polarizing film 50, for example, a surface protective film 57 may be laminated via the 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 sheets 44a and 44b formed by cutting the optical film laminate 40 thus formed into a specific width by the slitter 20 are used in the subsequent direction in the wide direction. The upper surface is cut and formed into a sheet-like optical film laminate. The release film 55 of the obtained sheet-like optical film laminate is peeled off 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, in the optical display device as a product, the adhesive layer 54 containing the optical film laminate 40 is maintained. As in the above, the state of the adhesive layer 54 is related to the optical properties of the product. The situation in which the quality of the display device is affected.

A problem that may occur as a state of the adhesive layer 54 is that partial peeling of the release film 55 occurs. (b) of FIG. 2 is an optical film laminate 40 in a state where partial peeling of the release film occurs in the case where the strip is cut by the technique described in Patent Document 1, for example. The main reason for the local peeling of such a release film is conceivable, mainly due to the rotation of the blade due to the rotation of the blade when the optical film laminate is cut by the rotating circular blade. Will be the one who produced the matter. If such a partial peeling occurs, when the release film is peeled off and the adhesive layer is attached to the optical display panel, there is a portion where the release film is peeled off and the periphery thereof is adhered to each other. The ribbed streaks appear at the boundary between the parts and cause a bad occurrence of the optical display device.

[cutting machine]

Fig. 3 is a schematic front view of a slitter 20 according to one embodiment of the present invention. The slitter 20 is provided with a laminated body supporting roller 21, 22, 23, and 24 having a substantially cylindrical shape, and a first circular shape disposed adjacent to the laminated body supporting rollers 21, 22, 23, and 24. The cutting edges 25, 26, and 27 are provided with respect to the optical film laminate 40 The second circular cutting edges 32, 34, and 36 at the opposite sides of the laminated body supporting rollers 21, 22, 23, and 24, and the outer peripheral surface 21f of the supporting rollers 21, 22, 23, and 24 from the laminated body 22f, 23f, and 24f are annular groove portions 28, 29, and 30 which are provided in a continuous manner in the circumferential direction up to a specific depth.

(Layered support roller)

The laminated body supporting rollers 21, 22, 23, and 24 are attached to the drive shaft 31 that is rotated in the direction of the arrow by, for example, a driving force from the outside, and can be rotated with the rotation of the drive shaft 31. The optical film laminate 40 is rotated around the rotation axis orthogonal to the longitudinal direction. The laminate supporting rollers 21, 22, 23, and 24 are provided with outer peripheral surfaces 21f, 22f, 23f, and 24f, respectively. At the outer peripheral surfaces 21f, 22f, 23f, and 24f, the release film 55 of the optical film laminate 40 covers a specific longitudinal direction and abuts against the ground.

In the embodiment shown in the drawing, although four laminated body supporting rollers 21, 22, 23, and 24 are provided in the slitter 20, the configuration of the laminated body supporting roller is not limited. Here, for example, all of the four laminated body supporting rollers 21, 22, 23, and 24 or a plurality of them may be integrally formed. Further, when the roller is constituted by a plurality of laminated bodies, the number of rollers supported by the laminate can be adapted to the optical film laminate sheet produced from the wide-width optical film laminate 40. The number of articles is suitable for decision. Further, the laminated bodies at both ends support the rollers 21 and 24, although it is not absolutely necessary to set them, By providing such a laminate supporting roller, since the optical film laminate 40 is appropriately supported even at the slit positions at both ends, the cutting accuracy can be further improved.

Each of the laminate supporting rollers 22 and 23 may be constructed by combining a plurality of members. For example, as shown in FIG. 3, the laminate support roller 22 can be formed by cutting a cylindrical member 22a and an end portion of the cylindrical member to make the cutout portion described later. The member 22b formed in a part of the groove portion 28 is combined to form. Similarly, the laminated body supporting roller 23 can be formed by cutting the cylindrical member 23a and the end portion of the cylindrical member so that the cutout portion becomes a part of the groove portion 29 to be described later. The formed member 23b is formed by combining them. In this way, by arranging the laminated body supporting rollers 22 and 23 as a plurality of members, the degree of freedom in adjusting the width of the slits can be improved, and the cost of the apparatus can be reduced.

Each of the laminates supports the length of the rollers 21, 22, 23, and 24 in a direction parallel to the axis of rotation, that is, the length of the laminate supporting roller, which can be adapted to the resulting optical film laminate strip The width is suitable for decision. 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 supporting roller 23 is set corresponding to the width of the optical film laminate strip 44b. Each of the laminates supports the length of the rollers 21, 22, 23, and 24 in the direction orthogonal to the axis of rotation, that is, the laminate support rollers 21, 22, 23, and 24 The diameter can be appropriately set according to the rigidity and cost. In other words, the laminate supports the rollers 21, 22, 23, and 24, and if the length is longer, it is necessary to set the diameter to be larger in order to ensure rigidity, and the rigidity becomes larger as the diameter is larger. It is high, but if it is increased more than necessary, the weight will become large, and it will have an adverse effect on handling and cost. Therefore, the diameter of the laminated body supporting rollers 21, 22, 23, and 24 is preferably designed to ensure the minimum rigidity in accordance with the relationship with the length.

(1st circular cutting edge)

In the embodiment shown in FIG. 3, between adjacent laminated support rollers, that is, between the laminate support roller 21 and the laminate support roller 22, and the laminate support roller 22 The first circular cutting edges 25, 26, and 27 are disposed between the laminated body supporting roller 23 and between the laminated body supporting roller 23 and the laminated body supporting roller 24. In the embodiment shown in the drawings, the first circular cutting edges 25, 26, and 27 are displayed as disc-shaped blades. However, the present invention is not limited thereto, and may be, for example, a ring. Shaped blade. For example, when the laminate supports all of the rollers 21, 22, 23, and 24 or a plurality of embodiments in which the laminated body is integrally formed, it may be disposed in the groove portion of the laminated body supporting roller. Configure the ring-shaped blade.

The first circular cutting edges 25, 26, and 27 are rotated together with the rotation of the drive shaft 31 and the laminated body supporting rollers 21, 22, 23, and 24, and are formed by a second circular shape to be described later. Cutting blade 32, The shearing force generated between 34 and 36 functions to cut the optical film laminate 40 in parallel with the longitudinal direction.

The interval between each of the first circular cutting edges 25, 26, and 27 is based on the length of the laminated body supporting rollers 22 and 23 set in accordance with the width of the resulting optical film laminate strip. Decide. That is, the width of the strip can be determined by changing the length of the laminate support rollers 22 and 23, so that the laminate support rollers 22 and 23 are also useful to determine The wide width of the strip determines the function of the spacer.

In the embodiment shown in the drawing, the first circular cutting edge 25 is disposed at a position where the edge portion 44c of the optical film laminate 40 is cut. The first circular cutting edge 25 and the first circular cutting edge 26 are formed such that the interval therebetween is a distance corresponding to the width of the optical film laminate strip 44a. Configuration. Similarly, the first circular cutting edge 26 and the first circular cutting edge 27 are formed such that the interval therebetween is a distance corresponding to the width of the optical film laminate strip 44b. , for configuration. Further, the first circular cutting edge 27 is disposed at a position where the edge portion 44d of the optical film laminate 40 is cut.

In the embodiment shown in the drawings, the slitting machine 20 is configured to include three first circular cutting edges 25, 26, and 27, but the number of the first circular cutting edges is It is not limited thereto, and may be appropriately determined depending on the number of optical film laminate sheets to be produced.

In the embodiment shown in FIG. 3, the diameters of the first circular cutting edges 25, 26, and 27 are combined with the laminated body supporting rollers 21, 22, and 23 And the diameter of 24 is equal. In other words, the front ends of the front edges of the first circular cutting edges 25, 26, and 27 are positioned on the same side as the outer peripheral surfaces 21f, 22f, 23f, and 24f of the laminated body supporting rollers 21, 22, 23, and 24. on. According to this configuration, the deflection of the optical film laminate at the slit position is reduced, and the accuracy of the slit can be improved, and the leakage or the defect of the adhesive can be prevented. However, the diameters of the first circular cutting edges 25, 26, and 27 are not limited thereto, and may be smaller than the diameters of the laminated body supporting rollers 21, 22, 23, and 24. The front ends of the sharp edges of the first circular cutting edges 25, 26, and 27 are positioned inside the grooves 28, 29, and 30, which will be described later.

The thickness of the first circular cutting edges 25, 26, and 27 is preferably about 0.5 mm to 5 mm. If it is too thin, there is a possibility that the edge is broken or the deformation of the edge of the blade is increased when the strip is cut, which adversely affects the accuracy. If it is too thick, although the rigidity becomes high, it will become high cost. Preferably, the thin first circular cutting edges 25, 26, and 27 are capable of suppressing the meandering of the leading edge during rotation and improving the accuracy of the cutting strip by means of two adjacent ones. The laminate supports the end faces of the rollers until they are as close as possible to the position of the edge.

The first circular cutting edges 25, 26, and 27 are provided with sharp-edged sharp edges that form an acute angle of the sharp edge. The angle of the sharp-edged edge is ideal for 20°~50°. If the angle of the sharp-edged edge is smaller than 20°, the uniformity of the shape of the cut surface of the optical film laminate strip becomes higher, but the first circular cutting edges 25, 26, and 27 durable The sexual system is reduced, and there is a flaw in the edge of the blade. Moreover, if the angle of the sharp-edged edge exceeds 50°, burrs or chipping tend to occur at the cut surface.

The shape of the sharp-edged edge of the first circular cutting edges 25, 26, and 27 is preferably as shown in Fig. 3, and is a single blade that is ground in such a manner that only one side is inclined. However, the present invention is not limited thereto, and may be, for example, a double edge that is ground so that both sides are inclined. However, when the sharp-edged edge is a double-edged blade, since the cut surface of the optical film laminate strip becomes a bevel, it may be at either end of one strip or The uniformity of the shape of the cut surface between the ends of the different strips is reduced.

As the material of the first circular cutting edges 25, 26, and 27, a metal, a ceramic, or the like can be used. Specifically, it is preferably iron, iron alloy, tool steel, stainless steel or the like. Further, it is preferable to apply a surface-treated blade such as titanium nitride, titanium carbide, or tungsten carbide to the materials.

(2nd circular cutting edge)

The slitter 20 is provided with second circular cutting edges 32, 34, and 36 provided on the opposite side of the laminated body supporting rollers 21, 22, 23, and 24 with respect to the optical film laminate 40. Each of the second circular cutting blades 32, 34, and 36 is rotatably supported by the cutting blades 33, 35, and 37 independently of each other, and is accompanied by the first circular cutting edge 25 , 26 and 27 rotate and rotate in conjunction. However, it can also be adopted 2 circular cutting edges 32, 34 and 36 are mounted on the same or different drive shafts, and the drive shaft is driven by the external driving force to the first circular cutting edges 25, 26 And the rotation speed of 27 is rotated at the same rotation speed.

The second circular cutting edges 32, 34, and 36 are such that each of the sharp edges is disposed at a position corresponding to each of the leading edges of the first circular cutting edges 25, 26, and 27. In the manner, it is set at the slitter 20. The edge of the first circular cutting edge 25 and the edge of the second circular cutting edge 32, the edge of the first circular cutting edge 26, and the edge of the second circular cutting edge 34, and the The edge of the circular cutting edge 27 and the edge of the second circular cutting edge 36 are respectively configured such that a part thereof overlaps each other, and the optical film laminate 40 is cut by the first circular shape. The shearing force between the blades 25, 26 and 27 and the second circular cutting edges 32, 34 and 36 is cut. The amount of overlap between the edge of the first circular cutting edges 25, 26, and 27 and the edge of the second circular cutting edges 32, 34, and 36, that is, D2 in Fig. 3, is 100 μm. The degree of ~1000μm is ideal.

In the embodiment shown in the figure, the slitting machine 20 is configured to include three second circular cutting edges 32, 34, and 36. However, the number of the second circular cutting edges is The number is not limited thereto, and may be the same as the number of the first circular cutting edges in accordance with the number of optical film laminate sheets to be produced.

Although the diameters of the second circular cutting edges 32, 34, and 36 are not limited, they are preferably equal to the diameters of the first circular cutting edges 25, 26, and 27. Also, ideal, the second round cut The thicknesses of the blades 32, 34, and 36 are equal to the thicknesses of the first circular cutting edges 25, 26, and 27.

The second circular cutting edges 32, 34, and 36 are provided with sharp-edged sharp edges that form an acute angle of the sharp edge. The angle of the sharp-edged edge is ideal for 20°~50°. If the angle of the sharp-edged edge is smaller than 20°, the uniformity of the shape of the cut surface of the optical film laminate strip becomes higher, but the second circular cutting edges 32, 34, and 36 Durability is reduced, and there is a tendency for the edge to become easily defective. Moreover, if the angle of the sharp-edged edge exceeds 50°, burrs or chipping tend to occur at the cut surface.

The shape of the sharp-edged edge of the second circular cutting edges 32, 34, and 36 is preferably as shown in Fig. 3, and is a single blade that is ground in such a manner that only one side is inclined. However, the present invention is not limited thereto, and may be, for example, a double edge that is ground so that both sides are inclined. However, when the sharp-edged edge is a double-edged blade, since the cut surface of the optical film laminate strip becomes inclined, it may be at either end of one strip or The possibility that the uniformity of the shape of the cut surface between the ends of the different strips is lowered. In order to make the shape of the cut surface of the end portion uniform in all the generated strips, it is more preferable that the shape of the sharp edge of the second circular cutting edges 32, 34, and 36 is the same as that of the first The sharp edge edges of the circular cutting edges 25, 26, and 27 have the same shape.

As the material of the second circular cutting blades 32, 34, and 36, a metal, a ceramic, or the like can be used. Specifically, it is preferably iron, iron alloy, tool steel, stainless steel or the like. Also, ideally, for Some of the materials are applied with a surface-treated blade of titanium nitride, titanium carbide, tungsten carbide or the like.

Preferably, at the slitter 20, the second circular cutting edges 32, 34 and 36 are manually or automatically movable on the axis of rotation in response to the positions of the first circular cutting edges 25, 26 and 27. Move the way to form it.

(groove)

In the embodiment shown in Fig. 3, the laminated body supporting rollers 22, 23, and 24 are continuous from the outer peripheral faces 22f, 23f, and 24f, and are continuous in the circumferential direction in the direction of the rotation axis. Further, the grooves 28, 29, and 30 having the specific depth D1 are provided in a ring shape. The groove portions 28, 29, and 30 are provided at positions overlapping the first circular cutting edges 25, 26, and 27 and the second circular cutting edges 32, 34, and 36, and the second circular cutting is performed. The edge of each of the blades 32, 34, and 36 enters each of the grooves 28, 29, and 30.

The width of the groove portions 28, 29, and 30, that is, the length of L1 shown in Fig. 3, is more than the total value of the thickness of the first circular cutting edge and the thickness of the second circular cutting edge. It is large, but it is ideal to be as close as possible to this total. By setting the width of the grooves 28, 29, and 30 to such a wide width, the optical film laminate 40 can be supported as close as possible by the laminate supporting rollers 22, 23, and 24 At the position where the strip is cut, it is thus possible to further improve the accuracy of the strip.

The depth of the grooves 28, 29, and 30, that is, the length of D1 shown in Fig. 3, is only required to be the edge of the outer peripheral faces 22f, 23f, and 24f and the second circular cutting edges 32, 34, and 36. The distance between the front ends (that is, the depth at which the sharp edges of the second circular cutting edges 32, 34, and 36 enter the grooves 28, 29, and 30) D2 may be larger, but ideally, the system is exhausted. Probably close to D2. By thus making the depths of the grooves 28, 29, and 30 as shallow as possible, the first circular cutting edges 25, 26, and 27 are always supported by the end faces of the rollers 22, 23, and 24 by the laminate. Pushing to a position close to the leading edge, the serpentine of the leading edge is suppressed during the rotation of the thin first circular cutting edge, and the cutting accuracy can be further improved.

More preferably, the overlapping portion between the first circular cutting edges 25, 26 and 27 and the second circular cutting edges 32, 34 and 36 is at a substantially midpoint of L1. By thus arranging the positions of the overlapping portions in this way, the distance from the cutting position to the position at which the optical film laminate 40 is supported is substantially equal due to being on both sides of the cutting position. It is possible to further improve the uniformity of the shape of the cut surface at the end portion of the optical film laminate sheet.

[cutting method]

Next, the slitting method by the slitter of the present invention will be described together with the operation of the slitting system 1 shown in Fig. 1 and the operation of the slitter 20 shown in Fig. 3.

As shown in FIG. 1 in general, in the slitting system 1, in advance by other The roll 42 of the optical film laminate 40 manufactured by the project is rotatably provided at the support shaft 12. The strip-shaped optical film laminate 40 which is fed from the roll 42 is fed in the longitudinal direction by the pair of feed rollers 13a and 13b, and is introduced into the feed rollers 13a, 13b. In the slitter 20 at the downstream side.

Figure 4 is a schematic view showing the state when the slitting machine 20 of Figure 3 is viewed from the left side, and is used for the strip-shaped optical film laminate 40 and the lamination at the time of slitting. The relationship between the body support rollers 21, 22, 23, and 24 and the first circular cutting edges 25, 26, and 27 and the second circular cutting edges 32, 34, and 36 will be described. 4 is a view for explaining the relationship between the optical film laminate 40 and the slitter 20, and therefore, it is noted that the thickness of the optical film laminate 40 and each of the slitters 20 are shown. The relative relationship between the dimensions of the components will be different from the actual device. Further, in Fig. 4, it is also shown that it is disposed in front of the slitter 20 with respect to the longitudinal direction of the optical film laminate 40 (that is, upstream of the feeding direction of the optical film laminate 40). One of the pair of feed rollers 13a (corresponding to the upstream side support roller described in the claims of the patent application) and the rear side of the slitter 20 (that is, optical The guide roller 14 at the downstream side in the feeding direction of the film laminate 40 (corresponding to the downstream side support roller described in the claims of the patent application). In the present embodiment, since the diameters of the first circular cutting edges 25, 26, and 27 and the diameters of the laminated body supporting rollers 21, 22, 23, and 24 are equal, in Fig. 4, 1 The outer circumference of the sharp-edged edge of the circular cutting edge 25 and the laminated body support The outer peripheral surface 21f of the roller 21 is drawn to coincide with each other. Further, the distance between the dotted line and the outer peripheral surface 21f at the portion of the laminated body supporting roller 21 in Fig. 4 represents the depth of the groove portion 28.

At the slitter 20, the optical film laminate 40 fed by the feed rollers 13a, 13b is as shown in Fig. 4, on the side of the release film 55 and the laminate support roller. 21, 22, 23, and 24, the outer circumferential surfaces 21f, 22f, 23f, and 24f are abutted by a specific longitudinal direction distance, and the orientation arrows of the rollers 21, 22, 23, and 24 are supported by the laminate. The direction of rotation is fed toward the long side. The second circular cutting edges 32 and 34 are disposed on the surface of the optical film laminate 40 opposite to the release film 55 (in the present embodiment, on the side of the optical functional film 50). 36. The edge of the first circular cutting edges 25, 26, and 27 and the edge of the second circular cutting edges 32, 34, and 36 are partially overlapped (in the present embodiment, the amount of overlap is equivalent In D2). Therefore, the optical film laminate 40 that is fed in the state supported by the laminate supporting rollers 21, 22, 23, and 24 is formed by the first circular cutting edges 25, 26, and 27 The cutting edge generated by the leading edge and the edge of the second circular cutting edge 32, 34, 36 is cut. In the present embodiment, the optical film laminate 40 is replaced by three first circular cutting edges 25, 26 and 27 and three second circular cutting edges 32, 34 and 36. The strips are two optical film laminate strips 44a and 44b and the edges 44c and 44d which are discarded.

The optical film laminate 40 covers a specific longitudinal direction distance and abuts the outer peripheral surfaces 21f, 22f, 23f, and 24f and is stand by. The specific long-side direction distance is as shown in Fig. 4, and is a length of a sector-shaped arc having a radius of θ as a central angle and a radius of the laminated body supporting rollers 21, 22, 23, and 24 as a radius. This angle θ is generally referred to as a wrap angle, and the wrap angle θ is preferably larger than θ1. Θ1 is an acute-angled edge that intersects when the acute-angled edge of the first circular cutting edges 25, 26, and 27 and the acute-angled edge of the second circular cutting edges 32, 34, and 34 are overlapped with each other. The line of two points on the outer circumference, that is, the point of connecting U in FIG. 4 (the point on the upstream side with respect to the feeding direction of the optical film laminate 40) and the point D (for the optical film laminate 40) When the line of the downstream side is the chord, and the point on the rotation axis of the laminated body supporting rollers 21, 22, 23, and 24 is the apex O, the central angle of the sector. In order to support the optical film laminate 40 more stably by the laminated body supporting roller, it is more preferable to surround the angle θ by more than about 10°.

In the slitter 20, the optical film laminate 40 is preferably such that the longitudinal direction of the abutting outer peripheral faces 21f, 22f, 23f, and 24f includes the above-described fan-shaped arc having the central angle θ1. In the manner of the range, the stacked support bodies 21, 22, 23, and 24 are fed on one side. That is, the optical film laminate 40 to be fed to the slitter 20 is preferably at a position closer to the upstream side in the feeding direction than at the U point, and is connected to the laminate supporting roller, and At a position closer to the downstream side in the feeding direction than the D point, the laminated body support roller is abutted away from the laminated body supporting roller (in other words, the optical film laminate is from the U point) The position on the upstream side always covers to the point D. The location on the downstream side is also supported by one side. In this state, the upstream side support roller (in the present embodiment, the roller 13a) supporting the optical film laminate 40 is provided on the upstream side of the slitter 20, respectively, and is on the downstream side of the slitter 20. The downstream side support roller (in the present embodiment, the guide roller 14) supporting the optical film laminate 40 is disposed, and the upstream side support roller and the downstream side support roller are supported with respect to the laminate support roller. 21, 22, 23, and 24 are implemented by the positional relationship shown in FIG.

Further, in the embodiment shown in Fig. 4, the upstream side support roller 13a and the downstream side support roller 14 are one roller, respectively, and are supported by the laminated body support rollers 21, 22, 23, and 24, respectively. The surface of the optical film laminate 40 on the opposite side to the surface supports the optical film laminate 40. However, the number of the upstream side support rollers and the downstream side support rollers and the abutment direction are not limited to the embodiment shown in FIG. For example, both the upstream side support roller and the downstream side support roller may be formed by a pair of rollers, for example, like the rollers 13a and 13b, and may be configured to support the optical film laminate 40 from both sides.

By causing the optical film laminate 40 to be diced in such a manner that the laminated body supporting rollers 21, 22, 23, and 24 are surrounded by the above, the offset of the cutting position is suppressed, and The cutting accuracy is improved, and the local peeling can be surely suppressed. When the starting point of the longitudinal direction range in which the optical film laminate 40 abuts the outer peripheral surfaces 21f, 22f, 23f, and 24f is at a position further upstream than the U point of FIG. 4, at the beginning of the slit Is to make the optical film layered The body 40 is cut into a state in which the outer peripheral surfaces 21f, 22f, 23f, and 24f are in contact with each other, and the cutting accuracy can be further improved. On the other hand, when the end point of the longitudinal direction range in which the optical film laminate 40 abuts against the outer peripheral surfaces 21f, 22f, 23f, and 24f is located at a position further downstream than the point D of FIG. 4, At the end of the strip, the optical film laminate strips 40a and 44b after being cut are held in contact with the outer peripheral surfaces 21f, 22f, 23f, and 24f, and the second circular rotation is performed. The blades 32, 34, and 36 are withdrawn from the optical film laminate 40, and the local peeling is more reliably suppressed.

In addition, the optical film laminate 40 is surrounded by the laminated body supporting rollers 21, 22, 23, and 24 so that the release film 55 and the outer peripheral surfaces 21f, 22f, 23f, and 24f are in contact with each other, and the second The circular rotary blades 32, 34, and 36 enter the optical film laminate 40 from the side of the optical function film 50 so as to penetrate the release film 55, thereby crossing the second circle of the adhesive layer. The direction DB in which the rotary blades 32, 34, and 36 are withdrawn from the optical film laminate 40 and the direction DF in which the release film 55 is peeled off from the adhesive layer 54 are in opposite directions, so that it is possible to The partial peeling of the release film 55 at the time of slitting of the film laminate 40 is surely suppressed. In addition, the optical film laminate 40 is supported by the laminate support rollers 21, 22, 23, and 24 so that the release film 55 is in contact with the outer peripheral surfaces 21f, 22f, 23f, and 24f. At the optical film laminate 40, forces are applied from the laminate supporting rollers 21, 22, 23, and 24, and the peeling can be surely suppressed.

Further, since the first circular cutting edges 25, 26, and 27 and the second circular cutting edges 32, 34, and 36 are all provided with sharp-edged sharp edges, it is possible to prevent the optical being cut. The end of the film laminate strips 44a and 44b is oozing or missing from the adhesive. Since the second circular cutting edges 32, 34, and 36 penetrate the optical film laminate, the bleeding or the leakage of the adhesive is more effectively prevented. When the first circular cutting edges 25, 26, and 27 and the second circular cutting edges 32, 34, and 36 are formed into sharp-edged edges of the same shape, the optical film laminated with the slit can be laminated. The shape of the cut surface of the end portions of the body strips 44a and 44b is more uniform.

Returning to Fig. 1, next, the plurality of optical film laminate sheets 44a, 44b, 44c, and 44d fed from the slitter 20 are fed in directions different from each other. The optical film laminate strip 44a is fed toward the longitudinal direction by the pair of feed rollers 15a, 15b via the guide roller 14, and is laminated by the optical film by winding the shaft 17. The volume of the film strip is taken up by 46. Similarly, the optical film laminate strip 44b, preferably via the guide roller 14, is guided in a direction different from the strip 44a by a pair of feed rollers 16a, 16b, and It is taken up by the roll 48 of the optical film laminate strip by the take-up shaft 18. The edge portions 44c and 44d are taken up by other winding shafts (not shown) and discarded.

In the above-described embodiment, when the first circular cutting edges 25, 26, and 27 and the second circular cutting edges 32, 34, and 36 are disposed at equal intervals, it is possible to obtain two of the same width. Laminated strips. also, When the first circular cutting edges 25, 26, and 27 and the second circular cutting edges 32, 34, and 36 are each two, one laminated strip can be obtained.

[Examples]

In the following, specific embodiments of the invention are described, but the invention is not limited by the embodiments.

(evaluation method)

Table 1 shows an evaluation item when an optical film laminate sheet was formed using the slitting machine of the examples and the comparative examples. The evaluation is based on the cutting accuracy of the formed optical film laminate strip, the uniformity of the left and right cut surfaces, the exudation or defect of the adhesive, and the local peeling of the release film, based on Table 1 The evaluation methods and evaluation indicators shown are carried out. Table 2 shows the constitution of the apparatus used as the examples and comparative examples.

(Example 1)

In the slitting machine of the first embodiment, a laminated body supporting roller having a diameter of 98 mm and having four grooves on the outer peripheral surface of the optical film laminate is used, and each of the four grooves is used. At the same time, a first circular cutting edge having the same diameter as the outer peripheral surface is provided. A second circular cutting edge having the same diameter as the first circular cutting edge is provided at a position corresponding to each of the first circular cutting blades. Therefore, the slitting machine of the first embodiment has four sets of first and second circular cutting edges. The front edge of the first and second circular cutting edges are sharp-edged and sharp-edged Degrees are set to 40 degrees. The distance between the adjacent first circular cutting edges is set to 400 mm. The material of the first and second circular cutting blades is a super-hard material.

In the outer peripheral surface of the laminated body supporting roller of the slitting machine of the first embodiment, a strip-shaped optical film laminate having a width of 1,330 mm is abutted, and by the first and second circular cutting edges, On the other hand, three optical film laminate sheets having a width of 400 mm corresponding to the distance between the adjacent circular cutting edges were formed. The optical film laminate is made of Nitto Denko Co., Ltd. (product name: NZBEFTMEQT-SU68) having a polarizing film and having a release film and a surface protective film on both surfaces thereof via an adhesive layer. 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 surface side was 38 μm. The release film is abutted on the outer peripheral surface of the laminated body supporting roller. The conveying speed of the film and the rotation speed of the circular cutting blade were 100 m/min. The long-side distance between the strip-shaped optical film laminate and the outer peripheral surface of the laminated body supporting roller is 68.4 mm, and the surrounding angle is 80 degrees.

(Example 2)

In the slitting machine of the second embodiment, the long-side distance between the optical film laminate and the outer peripheral surface of the laminate supporting roller is set to 12.8 mm (enclosed angle: 15 degrees). The other conditions are the same as in the first embodiment.

(Example 3)

In the slitting machine of the third embodiment, the diameter of the first circular cutting edge is made smaller than the diameter of the laminated body supporting roller. The diameter of the first circular cutting edge is 96 mm. The other conditions are the same as in the first embodiment.

(Comparative Example 1)

In the slitting machine of Comparative Example 1, the first circular cutting blade disposed on one side of the optical film laminate is disposed on the other side without the laminated body supporting roller. The second circular cutting edge on the side is used to cut the optical film laminate. The other conditions are the same as in the first embodiment.

(Comparative Example 2)

In the slitting machine of the second embodiment, the laminated body supporting roller having four groove portions is provided, and the outer peripheral portion of the laminated body supporting the roller end portion facing the groove portion is formed as the first cutting edge (edge cutting edge). Therefore, the angle of the edge of the first circular cutting edge is 90 degrees. The second cutting edge is provided at a position corresponding to the first cutting edge (edge edge). The other conditions are the same as in the first embodiment.

(Comparative Example 3)

In the slitter of Comparative Example 3, a laminated body supporting roller having four groove portions is provided, but the first cutting blade is not provided. First (2) The circular cutting edge is provided at a position corresponding to the four groove portions on the opposite surface side with the optical film laminate interposed therebetween, and the edge of the second circular cutting edge is configured as Enter into the ditch. The other conditions are the same as in the first embodiment.

(Comparative Example 4)

In the slitting machine of Comparative Example 4, the release film is not brought into contact with the outer peripheral surface of the laminated body supporting roller, but the surface protective film is brought into contact with the outer peripheral surface of the laminated body supporting roller. The other conditions are the same as in the first embodiment.

(Evaluation results)

Table 3 shows the results of evaluation based on the respective items in Table 1 for the optical film laminate sheets formed using the slitting machines of Examples 1 to 3 and Comparative Examples 1 to 4. For display.

With respect to Example 1, the cutting accuracy was high, and it was possible to obtain a uniform optical film laminate sheet in which the shape of the left and right cut surfaces was uniform. No bleeding or defects of the adhesive occurred, and local peeling of the release film did not occur.

In the second embodiment, if compared with the first embodiment, the accuracy of the cutting is maintained with the necessary accuracy, but it is a result of a certain decrease in accuracy. It is presumed that this is because the distance between the long side direction of the optical film laminate and the laminated body supporting roller is short (the angle of the hug is small), so that the film is supported on the roller. The stability of the obtained cut portion will be reduced. Regarding the local peeling of the release film, peeling of a size of 500 μm or more was not observed, and only peeling to the extent that it was practically not problematic occurred. The shape of the cut surfaces on the left and right sides is uniform, and no bleeding or defect of the adhesive occurs.

In the third embodiment, the cutting accuracy is somewhat reduced. However, it can be inferred that since the diameter of the first cutting edge is smaller than the diameter of the laminated support roller, At the time of cutting, the optical film laminate is pressed by the second cutting edge. It can be inferred that the reason for the occurrence of bleeding or defect of the adhesive is the same. However, the shape of the cut surfaces on the left and right sides was uniform, and partial peeling of the release film did not occur.

In Comparative Example 1, since the body does not have the structure of the laminated body supporting roller, the optical film lamination system is not supported at the cutting position, and is cut into a strip in a state of being floated in the air. . Therefore, the sway of the cutting position occurs, and the accuracy of the cutting is greatly reduced. Further, when the slit is formed, the film is shaken, so that the adhesive is oozing or missing, and local peeling of the release film occurs.

In Comparative Example 2, since the shape of the first cutting edge and the shape of the second cutting edge are different, the shape of the left and right cut surfaces is significantly different. Fig. 5 is a view for comparison of Example 1 (a) and Comparative Example 2 (b) for the shapes of the cut surfaces on the right and left sides. Fig. 5(a) shows two adjacent ones which are cut after being cut by a circular cutting edge each having an acute sharp edge. Photograph of the end portions of the strips 1 and 2, Fig. 5(b), by providing a circular cutting edge having an acute-angled edge at the side of the strip 1 and having an edge at the side of the strip 2 The cutting machine of the blade is a photograph of the ends of the two adjacent strips 1 and 2 after the stripping. It can be seen that the cut surface of Comparative Example 2 is different in shape which is obvious to the left and right.

In the comparative example 3, although the cutting position is supported by the laminated body supporting roller, the optical film laminate is pushed into one side of the second cutting edge, and the strip is cut. Accuracy is poor. Further, since the film is pushed in, the adhesive is also oozing or missing.

In the comparative example 4, the optical film is in a state in which the surface protective film and the outer peripheral surface of the laminate supporting roller are not brought into contact with each other without causing the release film and the laminated body to support the roller. The laminate was subjected to slitting, but local peeling of the release film occurred. It is presumed that this is because the slitting machine of Comparative Example 4 is not configured to wrap the release film side on the laminated body supporting roller, and therefore, the roller is not supported from the laminated body. A force is applied to the side of the release film, and the second cutting edge positioned on the side of the release film penetrates the optical film laminate, and the adhesive layer is pulled at this time.

20‧‧‧cutting machine

21, 22, 23, 24‧‧‧ layered support roller

21f, 22f, 23f, 24f‧‧‧ outer perimeter

22a, 22b, 23a, 23b‧‧‧ components

25, 26, 27‧‧‧1st circular cutting edge

28, 29, 30‧‧‧

31‧‧‧Drive shaft

32, 34, 36‧‧‧2nd circular cutting edge

33, 35, 37‧‧‧ cutting blade

Claims (8)

A device for slitting an optical film laminate in parallel with a longitudinal direction thereof to form a plurality of optical film laminate sheets, the optical film laminate comprising strip-shaped optics a functional film, and a strip-shaped release film laminated on one side of the optical functional film via an adhesive layer, and configured to be at an interface between the release film and the adhesive layer In the apparatus, the apparatus includes a laminated body supporting roller, and is provided with a peripheral surface disposed such that the release film of the optical film laminate is abutted, and a plurality of groove portions provided in a continuous manner in the circumferential direction at any position of the outer peripheral surface, and rotated around a rotation axis parallel to the wide direction of the optical film laminate; and plural A circular cutting edge is provided with an acute-angled edge edge, and is attached to the laminated layer so that each of the acute-angled cutting edges is positioned inside the corresponding groove portion of the plurality of groove portions. Body support roll And a plurality of second circular cutting edges each having an acute-angled edge, and each of the sharp-edged edges is cut with respect to the optical film laminate The opposite side of the broken blade is disposed at a position corresponding to each of the acute-angled edges of the plurality of first circular cutting edges, and is provided with the plurality of first circular cutting edges Cooperating to cut the optical film laminate, and the optical film laminate is more than the first circular cutting edge The two of the two sharp edges of the acute-angled edge that intersect each other when the acute-angled edge of the second circular cutting edge overlaps with each other are located in the optical film laminate. a position further upstream from a point on the upstream side, which is in contact with the above-mentioned laminated body supporting roller, and at a position further downstream than a point on the downstream side in the feeding direction of the above two points, from the aforementioned laminated body The support roller is supported by the support of the roller. The apparatus according to the first aspect of the invention, wherein the optical film laminate is supported at a position further upstream than a position at which the optical film laminate and the laminate support roller are in contact with each other. The upstream side support roller disposed in the manner and the downstream side disposed at a position further downstream than the position of the optical film laminate from the laminate support roller to support the optical film laminate The side supports the roller. The apparatus according to the first or second aspect of the invention, wherein the acute sharp edge of the plurality of first circular cutting edges and the acute sharp edge of the plurality of second circular cutting edges are The shape is the same. The apparatus according to the first or second aspect of the invention, wherein the front end of the acute-angled edge of the plurality of first circular cutting edges is located on the outer peripheral surface of the laminated body supporting roller. On the same side. A method of forming a plurality of optical film laminate sheets by stripping an optical film laminate in parallel with a longitudinal direction thereof, the optical film laminate comprising strip-shaped optics Functional thin a film and a strip-shaped release film laminated on one side of the optical functional film via an adhesive layer, and configured to be capable of being formed at an interface between the release film and the adhesive layer In the method of peeling, the method of feeding the optical film laminate toward the longitudinal direction while supporting the surface of the release film of the optical film laminate; The optical film laminate is subjected to a slitting process by a cooperation of a plurality of first circular cutting edges and a plurality of second circular cutting edges, and the plurality of first circular cutting edges are Each of which has an acute-angled edge and is disposed at a surface side supporting the optical film laminate, and the plurality of second circular cutting edges are respectively provided with an acute-angled edge, and the sharp-edged edge is provided Each of the optical film laminates is disposed on a side opposite to the plurality of first cutting edges, and corresponds to each of the acute sharp edges of the plurality of first circular cutting edges. Set the location at the location. The method of claim 5, wherein the optical film laminate is cut from the first circular shape in the process of feeding the optical film laminate toward the longitudinal direction. The sharp edge of the blade and the sharp edge of the second circular cutting edge overlap each other, and the two sharp edges of the sharp edge are located at the outer periphery of the optical film laminate. The point of the upstream side of the feed direction and the position of the upstream side are always covered to the point on the downstream side of the feed direction in the above two points. The downstream location is at the end of the day and is supported. The method of claim 5, wherein the at least one of the plurality of first circular cutting edges has the acute rounded edge and the at least one of the plurality of second circular cuts The aforementioned sharp-edged edge of the broken blade has the same shape. The method of claim 5, wherein the optical film laminate is subjected to a slitting process comprising a plurality of the first circular cutting edges of the at least one of the plurality of optical film laminates. The position of the front end position of the acute-angled edge is cut in the same state as the surface on which the optical film laminate is supported.