JP2008200788A - Optical film cutting device and optical film manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical film cutting device which can cut an optical film at high speed, and is excellent in productivity and yield, and to provide an optical film manufacturing method. <P>SOLUTION: The cutting device is provided for cutting the long optical film 2 to obtain a plurality of optical films 4. The cutting device is formed of: an optical film original roll 1; a slitter 10 which slits the long optical film 2 unreeled from the original roll 1 in a carrying direction so as to have a predetermined width; a cross cutter 20 which cuts the long optical films 4 in a direction orthogonal to the carrying direction so as to have a predetermined length; a separate conveyor 30 which separately carries the plurality of cut-out optical films 4 in a manner avoiding overlapping of the optical films each other; a pair of cleaning rollers 40, 40 for removing foreign matter adhering to each optical film 4; and an accumulating section 50 which accumulates the optical films 4 on each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cutting device for cutting out a plurality of single-wafer optical films from a long optical film, and a method for manufacturing the optical film.

  For example, optical films represented by polarizing films, retardation films, etc. are important optical components that constitute liquid crystal display devices, etc. Usually, long optical films are used as raw materials, and single-wafer optical films are cut from this. It is manufactured by cutting out with The cutting apparatus is required to be able to cut an optical film at a high speed and to be excellent in productivity and yield.

  For example, in Patent Document 1, an original fabric supply device, a cutting device that cuts a roll-like long sheet supplied from the original fabric supply device into sheets of a predetermined size, and a cutting device that is cut. A single-wafer cutting device comprising a stacking device for stacking single sheets is described. The cutting apparatus includes: a rotary slitter that cuts a long sheet in a width direction with a predetermined width; and a shear cutter (guillotine cutter) that cuts a long sheet cut in the width direction in a longitudinal direction with a predetermined length. It is configured.

  However, cutting with a shear cutter has a problem that cutting waste is likely to be generated. For this reason, when the long sheet | seat of an optical film is cut | judged using the sheet | seat cutting device described in patent document 1, the cutting | disconnection waste tends to generate | occur | produce and the damage | wound resulting from this cutting | disconnection waste generate | occur | produces on the optical film surface. Productivity and yield decrease. Further, in the stacking apparatus, when a large number of optical films having cutting waste adhered to the surface are stacked together with other optical films, the cutting waste bites into the optical film by the weight of the stacked optical films, and as a result, the optical film Scratches occur.

Therefore, when the long sheet of the optical film is cut using the single-wafer cutting device described in Patent Document 1, it must be cut at a speed at which cutting waste is not easily generated. That is, the single wafer cutting apparatus described in Patent Document 1 cannot cut a long optical film at high speed.
JP 2004-188552 A

  An object of the present invention is to provide an optical film cutting apparatus and an optical film manufacturing method capable of cutting an optical film at high speed and excellent in productivity and yield.

  An optical film cutting device according to the present invention for solving the above-mentioned problems is for cutting a plurality of single-sheet optical films from a long optical film, and includes an optical film original roll and an original film roll. A slitter that slits a long optical film fed out from an anti-roll with a predetermined width in the transport direction of the optical film, and a slit long optical film that is cut at a predetermined length in a direction perpendicular to the transport direction And a separate conveyor that separates and conveys a plurality of single-wafer optical films cut out from the slit long optical film so as not to overlap each other. A pair of cleaning rollers that remove foreign matter adhering to each conveyed optical film and each optical film from which foreign matter has been removed are collected. Characterized by comprising an integrated unit for.

  Further, another optical film cutting device according to the present invention is for cutting out a plurality of single-sheet optical films from a long optical film, the optical film original roll and the original roll A slitter that slits the drawn long optical film with a predetermined width in the transport direction of the optical film, and a cross cutter that cuts the slit long optical film with a predetermined length in a direction perpendicular to the transport direction And by the cutting of this cross cutter, a plurality of single-wafer optical films cut out from the slit long optical film were separated and conveyed so as not to overlap each other, and conveyed separately A pair of cleaning rollers for removing foreign matter adhering to each optical film, and a stacking unit for collecting each optical film from which foreign matter has been removed; A defect mark detecting means for detecting a defect mark that is provided on the upstream side or downstream side in the transport direction from the slitter and that indicates a defective portion of the optical film that has been marked in advance on the optical film, and the cross cutter and the separator Based on the detection result from the defect mark detection means, the discharge mechanism for discharging the optical film including the defective portion provided between the conveyor and cut by the cross cutter, and the discharge mechanism And a control means for sequentially driving.

  In the other optical film cutting apparatus according to the present invention, the defect mark previously marked on the optical film is a bar code obtained by coding a defect mark marked by the marking means or a defective portion of the optical film. Is good.

  Further, in the present invention, a trim cutter that cuts both side edges of a long optical film on the upstream side in the transport direction from the cross cutter in order to correspond to a single-sheet optical film having various widths. It is preferable to provide it. In order to improve the conveyance speed of the optical film and simplify the exchange of the knife, the cross cutter includes a knife roll provided with at least one knife in the longitudinal direction on the outer peripheral surface, and a lower part of the knife roll. It is desirable that the rotary cutter is composed of a plain roll which is positioned and whose outer peripheral surface is in contact with the blade edge of the knife.

  In separating and reliably transporting the cut out optical films of the plurality of single sheets so as not to overlap each other, the separate conveyor is composed of a plurality of conveyor belts, and each conveyor belt is adjacent to each other. It is preferable that the gaps are arranged so as to spread at a predetermined gap toward the downstream side in the transport direction. Further, in order to improve the conveyance speed of the optical film and suppress the curling of the optical film, the separate conveyor includes an adsorption mechanism that conveys the optical film while adsorbing and holding the optical film on a conveyance surface. Good.

The upper roll is composed of an upper roll and a lower roll between the cleaning roller and the stacking unit for improving the yield and collecting the optical film in the stacking unit without causing the optical film to cause a transfer failure or the like. And / or an air blowing means provided with a kicking roll whose rotational speed of the lower roll is faster than the conveying speed of the optical sheet, and an air blowing port facing the back surface of the optical film kicked out by the kicking roll in the vicinity of the lower roll It is desirable to provide.
It is preferable that the conveyance speed of the optical film is 5 to 50 m / min.

  A method for producing an optical film according to the present invention is a method for producing an optical film by cutting out a plurality of single-wafer optical films from a long optical film, wherein the long optical film is produced from a raw roll of optical film. A step of feeding, a slitting step of slitting the fed optical film in the transport direction of the optical film with a predetermined width, and cutting the slit long optical film in a direction perpendicular to the transport direction with a predetermined length A cutting process, a process of separating and transporting a plurality of single-wafer optical films cut out from a slit-like long optical film by this cutting so as not to overlap each other, and each optical transported separately The method includes a step of removing foreign matter adhering to the film and a step of accumulating optical films from which the foreign matter has been removed.

  Another method for producing an optical film according to the present invention is a method for producing an optical film by cutting out a plurality of single-sheet optical films from a long optical film, wherein the optical film is produced from an optical film roll. A step of unwinding the film, a slitting step of slitting the unwound optical film with a predetermined width in the transport direction of the optical film, and a slit-long optical film with a predetermined length in a direction perpendicular to the transport direction A cutting step of cutting, a step of separating and transporting a plurality of single-layer optical films cut out from the slit long optical film so as not to overlap with each other, and a separated transport Including a step of removing foreign matter adhering to each optical film, and a step of accumulating each optical film from which the foreign matter has been removed. Alternatively, a step of detecting a defect mark indicating a defective portion of the optical film previously marked on the optical film, and a step of cutting the optical film including the defective portion in the cutting step based on the detection result And a step of discharging the optical film including the cut defect portion.

According to the optical film cutting apparatus of the present invention, the optical film can be cut at a high speed, and the productivity and the yield are excellent.
According to the other optical film cutting apparatus of the present invention, since the defective portion of the optical film can be discharged, among the effects described above, there is an effect that the yield is particularly excellent.
The method for producing an optical film of the present invention has an effect of being excellent in productivity and yield.
According to the other method for producing an optical film of the present invention, since the defective portion of the optical film is discharged, among the effects described above, there is an effect that the yield is particularly excellent.

  Hereinafter, an optical film cutting device and an optical film manufacturing method according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic side view showing a side surface of an optical film cutting device according to the present embodiment. FIG. 2 is a schematic plan view showing the plane of the optical film cutting device according to the present embodiment. FIG. 3 is a schematic explanatory view showing a method of cutting an optical film using the optical film cutting device according to the present embodiment. FIG. 4 is an enlarged schematic explanatory view showing the cross cutter according to the present embodiment. FIG. 5 is an enlarged schematic explanatory view showing the vicinity of the kicking roll according to the present embodiment.

  As shown in FIGS. 1 and 2, the optical film cutting apparatus according to the present embodiment includes an original film roll 1 of an optical film and a conveying direction of a long optical film 2 fed out from the original film roll 1 ( A slitter 10, a cross cutter 20, a separate conveyor 30, a pair of cleaning rollers 40 and 40, and a stacking unit 50 are provided in this order from the upstream side in the direction of arrow A). And as shown in FIG. 3, the long optical film 2 drawn | fed out from the original fabric roll 1 is slit in the conveyance direction of an optical film, and the optical film of several sheets is cut | disconnected from the slit long optical film 3 4 is cut out.

  Specifically, as shown in FIG. 2, the original roll 1 of the optical film is formed by winding a long optical film 2 around a winding shaft 1 a that is a core material in a roll shape. The unwinding shaft 1a is preferably, for example, a conical shape. Both ends of the unwinding shaft 1a are rotatably supported by a pair of bearings 1b and 1b. Then, as shown in FIG. 1, the optical film 2 is fed from the raw roll 1 at a constant speed in the direction of arrow A by a pair of feeding rolls 16 and 16.

  The slitter 10 is for slitting (cutting) the long optical film 2 drawn out from the raw roll 1 in the transport direction (arrow A direction) of the optical film with a predetermined width. The slitter 10 concerning this embodiment is comprised from the some rotary blade 11 and the roll 12 which is located under this rotary blade 11 and an outer peripheral surface touches the blade edge | tip of the rotary blade 11 (refer FIGS. 1-3). ).

  A plurality of the rotary blades 11 are arranged in parallel in a direction orthogonal to the transport direction (that is, a direction that forms an angle of 90 degrees with respect to the transport direction) at intervals corresponding to the width of the cut optical film 4. . The interval between the rotary blades 11 may be arbitrarily selected according to the width of the sheet-like optical film 4, but is usually preferably about 100 mm to 1200 mm.

  The number of the rotary blades 11 to be arranged may be arranged according to the number of cut optical films 4 to be cut out. Moreover, the number of the rotary blades 11 is not limited to a plurality, and may be one. Specifically, the number of cut optical films 4 is usually about 2 to 6, and the number of rotary blades 11 is preferably about 1 to 5 in general.

  Such a slitter 10 is a so-called NC (numerical controlled) slitter using a numerical control method in which each rotary blade 11 automatically positions each other when a cutting dimension is input to the operation panel in order to improve productivity. Is preferred.

  The slit of the optical film 2 by the slitter 10 is performed as follows. That is, first, the optical film 2 fed out at a constant speed in the direction of arrow A by the pair of feeding rolls 16 and 16 is conveyed between the rotary blade 11 of the slitter 10 and the roll 12. Next, the blade 11 of the rotary blade 11 presses the conveyed optical film 2 against the outer peripheral surface of the roll 12, and the rotary blade 11 is rotated by the movement of the optical film 2. As a result, the optical film 2 is slit in the transport direction with a predetermined width (that is, the interval between the rotary blades 11).

  In addition, it is preferable to provide the trim cutters 13 and 13 for cutting the side edge parts 5 and 5 of the elongate optical film 2 in the conveyance direction upstream rather than the cross cutter 20 demonstrated below. Although the width of the sheet optical film 4 is various (that is, indefinite), if the trim cutters 13 and 13 are provided, it is possible to easily cope with such various widths. Examples of the trim cutters 13 and 13 include those having the same configuration as that of the rotary blade 11 described above. Further, a so-called ear winding machine or the like may be employed. The side edges 5 and 5 of the cut optical film 2 are discharged toward the receiver 15 by the pair of discharge rolls 14 and 14.

  The cross cutter 20 is for cutting the slit long optical film 3 in a direction perpendicular to the transport direction by a predetermined length. As shown in FIG. 4, the cross cutter 20 according to the present embodiment includes a knife roll 22 having four knives 21,..., 21 provided at equal intervals in the longitudinal direction on the outer peripheral surface, and the knife roll 22. Is a rotary cutter composed of a plain roll 23 whose outer peripheral surface is in contact with the cutting edge of the knife 21. Thereby, while being able to improve a conveyance speed, there exists an effect that replacement | exchange of the knife 21 becomes easy.

  The length by which the optical film 3 is cut by the cross cutter 20 can be adjusted to a desired length by adjusting the rotation speed of the knife roll 22. Further, it can be adjusted by the diameters of the knife roll 22 and the plain roll 23 and the number of knives 21 provided in the knife roll 22. The rotation speed of the knife roll 22 and the diameters of the knife roll 22 and the plain roll 23 may be arbitrarily selected according to the length of the optical film 3 being cut, that is, the length of the single-layer optical film 4, and are particularly limited. However, the rotation speed of the knife roll 22 is usually about 15 to 600 rpm, the diameter of the knife roll 22 is usually about 50 mm to 200 mm, and the diameter of the plain roll 23 is usually The diameter is preferably about 100 mm to 300 mm. The number of knives 21 included in the knife roll 22 is not limited to four, and may be arbitrarily selected from the range of 1 to 10, usually 1 to 4. Such rotary cutters are described in, for example, Japanese Patent Laid-Open Nos. 6-304895 and 8-112798.

  The cutting of the optical film 3 by the cross cutter 20 is performed as follows. That is, first, the slit long optical film 3 is conveyed between the knife roll 22 and the plain roll 23 of the cross cutter 20. Next, the edge of the knife 21 provided in the knife roll 22 is pressed against the outer peripheral surface of the plain roll 23 by pressing the conveyed optical film 3. As a result, the slit long optical film 3 is cut into a predetermined length in a direction orthogonal to the transport direction (that is, a direction that forms an angle of 90 degrees with respect to the transport direction). Then, when the knife roll 22 rotates 1/4, the next optical film 3 is cut in a predetermined direction.

  The separate conveyor 30 is for separating and transporting a plurality of single-sheet optical films 4 cut out from the optical film 3 as described above so as not to overlap each other. 2 and 3, the separate conveyor 30 according to the present embodiment includes a plurality of conveyor belts 31, and each conveyor belt 31 has an interval between adjacent conveyor belts 31 on the downstream side in the transport direction. It is arrange | positioned so that it may spread at predetermined intervals toward. Thereby, even if the cut-out optical films 4 are in a state of being overlapped with each other, the intervals between the optical films 4 adjacent to each other toward the downstream side in the transport direction of the separate conveyor 30 are spread to a predetermined interval, that is, Separated and transported so as not to overlap.

  More specifically, on the downstream side in the transport direction of the separate conveyor 30, the interval between the conveyor belts 31 adjacent to each other is set so that the interval between the adjacent optical films 4 is about 1.5 to 2.5 mm. It is preferable to arrange so as to spread at a predetermined interval toward the downstream side in the transport direction. Further, the number of conveyor belts 31 is not particularly limited, but is usually about 5 to 15, but a plurality of single-layer optical films 4 are separated and conveyed so as not to overlap each other. It is preferable because it becomes easy.

  On the other hand, if the conveyor belts 31 are not arranged in the predetermined positional relationship, a plurality of single-sheet optical films 4 are conveyed in a state of being overlapped with each other. When the optical film 4 is conveyed in such a state, when the foreign matter on the optical film 4 is removed by a cleaning roller 40 to be described later, a dent is generated in the overlapped portion of the optical film 4 and the optical film 4 Scratches occur.

  The separate conveyor 30 is preferably provided with a suction mechanism for sucking and holding the optical film 4 on the transport surface. Thereby, since the optical film 4 mounted on the surface of the separate conveyor 30 can be fixed, even an optical film curled at high speed can be reliably conveyed.

  2 and 3, the suction mechanism according to the present embodiment has a suction box (having a number of suction holes 32 formed in the entire area of each conveyor belt 31 and a number of suction openings below the separate conveyor 30. (Not shown) is arranged. As a result, when the pressure in the suction box is reduced, the air on the surface of each conveyor belt 31 is sucked into the suction box through the suction holes formed in each conveyor belt 31, so that the suction on the surface of each conveyor belt 31 is sucked. A force is generated, and as a result, the effects described above can be achieved.

  The pair of cleaning rollers 40, 40 are for removing foreign matter adhering to each optical film 4 conveyed separately. As shown in FIGS. 1 and 3, the cleaning roller 40 according to this embodiment includes a weak adhesive roll 41 and a strong adhesive roll that is disposed so as to be in contact with the weak adhesive roll 41 and has a stronger adhesive force than the weak adhesive roll 41. 42. More specifically, the weak adhesive roll 41 and the strong adhesive roll 42 are provided with an adhesive layer made of, for example, an acrylic resin on the peripheral surface of each roll, and the thickness of the adhesive layer, the composition of the acrylic resin, etc. In the weak adhesive roll 41, the adhesive force is such that foreign matter attached to the optical film 4 can be removed. In the strong adhesive roll 42, the foreign matter adhered to the weak adhesive roll 41 is weakly adhered. The adhesive strength is such that it can be peeled off from the roll 41.

  The removal of the foreign matter adhering to each optical film 4 by the pair of cleaning rollers 40, 40 is performed as follows. That is, first, when the optical films 4 separated and transported so as not to overlap each other are transported between the weak adhesive rolls 41 and 41 of the pair of cleaning rollers 40 and 40, the foreign matter attached to the optical film 4 is weak. It is attached to the adhesive rolls 41 and 41 and removed from the optical film 4. Next, the weak adhesive rolls 41 and 41 are rotated by the movement of the optical film 4, and the strong adhesive rolls 42 and 42 are rotated with the rotation of the weak adhesive rolls 41 and 41. Thereby, the said foreign material stuck to the weak adhesive rolls 41 and 41 is stuck to the strong adhesive rolls 42 and 42 and removed from the weak adhesive rolls 41 and 41. As a result, the surface of the weak adhesive rolls 41 and 41 is , Always clean.

  Each optical film 4 from which the foreign matter has been removed is transported to the stacking unit 50 by the transport conveyor 45. As shown in FIGS. 2 and 3, the transport conveyor 45 according to the present embodiment includes a plurality of conveyor belts 46 in order to easily align and transport the optical films 4 from which foreign substances have been removed. . The number of conveyor belts 46 is not particularly limited, but in order to achieve the effects described above, it is usually preferably about 2 to 8.

  Moreover, it is preferable that the conveyance conveyor 45 is provided with the adsorption | suction mechanism for the same reason as the separate conveyor 30. FIG. That is, it is preferable that a large number of suction holes 47 are formed in the entire area of each conveyor belt 46 and a suction box (not shown) having a large number of air inlets is disposed below the conveyor 45.

  A so-called pressing roll (not shown) may be provided above the conveyor 45. The pressing roll is attached to the mounting shaft, and is configured to press the optical film 4 from above with its own weight or light urging force in order to prevent the conveyed optical film 4 from curling. In addition, the structure of the conveyance conveyor 45 should just be a structure which can convey the optical film 4 to the stacking part 50, and is not limited to an above described structure.

  A plurality of kick rolls 60 and air blowing means 65 are preferably provided between the cleaning roller 40 and the stacking unit 50 (that is, between the conveyor 45 and the stacking unit 50). As a result, the optical film 4 can be integrated in the stacking unit 50 without damaging the optical film 4 and without causing the optical film 4 to have poor connection.

  As shown in FIG. 5, the kicking roll 60 according to this embodiment includes an upper roll 61 and a lower roll 62, and the rotational speed of the upper roll 61 and / or the lower roll 62 is higher than the conveyance speed of the optical sheet 4. It is also configured fast. Thereby, the optical sheet 4 conveyed by the conveyor 45 is kicked out toward the stacking unit 50 by the kicking roll 60.

The air blowing means 65 is configured in the vicinity of the lower roll 62 so that the air blowing port 66 faces the back surface of the optical film 4 kicked out by the kicking roll 60. Thereby, air can be blown out in the arrow B direction from the air blowing means 65 toward the back surface of the optical film 4 kicked out by the kicking roll 60. As a result, the kicked optical film 4 is in a floating state with respect to the kicking direction by the kicking roll 60, and is then accumulated in the stacking unit 50, so that the optical film 4 is not damaged. In addition, the optical film 4 can be accumulated in the accumulating unit 50 without causing a connection failure or the like.
In general, the number of kicking rolls 60 and air blowing means 65 is preferably about 1 to 8.

  The stacking unit 50 is for stacking the optical films 4 from which foreign substances have been removed. As shown in FIGS. 1 to 3, the stacking unit 50 according to the present embodiment receives each optical film 4 that is aligned and transported by the transport conveyor 45, and stacks and stocks a large number of sheets in the cassette 51. An elevating mechanism 52 for elevating and lowering the cassette 51 according to the thickness of the optical film 4 configured and integrated is provided. In addition, it is preferable that the cassette 51 is configured so that the tilt can be freely set for efficiently stocking the optical film 4.

  The accumulation of the optical film 4 by the accumulation unit 50 is performed as follows. That is, when a predetermined number of optical films 4 are stacked on the cassette 51, the lifting mechanism 52 lowers the cassette 51 from the stacking position to the lower cassette removal position, and then removes the cassette 51 in the direction of arrow C (see FIG. 2). ). After the cassette 51 is taken out, the lifting mechanism 52 is raised again to the stacking position, then the new cassette 51 is moved in the direction of the arrow D and set on the lifting mechanism 52, and the newly transported optical film 4 is stacked. To do.

  The optical film cutting device according to the present embodiment having the above-described configuration can set the conveyance speed of the optical film to 5 to 50 m / min.

Next, another embodiment of the optical film cutting device and the optical film manufacturing method of the present invention will be described in detail with reference to the drawings. FIG. 6 is a schematic side view illustrating a side surface of the optical film cutting device according to the present embodiment. FIG. 7 is a schematic plan view showing a plane of the optical film cutting device according to the present embodiment. FIG. 8 is a schematic explanatory view showing a method of cutting an optical film using the optical film cutting apparatus according to the present embodiment. FIG. 9 is an enlarged schematic explanatory view showing the vicinity of the discharge mechanism according to the present embodiment.
6 to 9, the same components as those in FIGS. 1 to 5 described above are denoted by the same reference numerals and description thereof is omitted.

  The optical film cutting device according to the present embodiment is configured such that defective portions of the optical film can be discharged. Specifically, as shown in FIGS. 6 to 9, the optical film cutting device includes a defect mark detection unit 70 and a discharge in addition to the configuration provided in the optical film cutting device according to the above-described embodiment. A mechanism 80 and a control means 90 are provided.

  The defect mark detection means 70 is provided on the upstream side or the downstream side in the transport direction with respect to the slitter 10, and as shown in FIG. 8, the defect portion 71 of the optical film 2 marked in advance on the long optical film 2. This is for detecting a defect mark (for example, a bar code 72).

  Here, the defect mark preliminarily marked on the optical film 2 is, for example, previously marked on the defect portion 71 of the long optical film 2 with a marking means such as a marker using a defect marking device for a sheet-like product. Or a bar code 72 obtained by coding the defective portion 71 of the optical film 2. In addition, as a defect marking apparatus of the said sheet-like product, it describes in Unexamined-Japanese-Patent No. 2002-148198 etc., for example. In addition, apparatuses for applying a barcode obtained by encoding a defective portion of the optical film are described in, for example, Japanese Patent Application Laid-Open Nos. 5-341487 and 2003-202298.

  In this way, the long optical film 2 with the defect mark 71 indicating the defective portion 71 of the optical film 2 is wound around the unwinding shaft 1a, which is the core material, in a roll shape, and the optical film according to the present embodiment. The original fabric roll 1 is constituted.

  As shown in FIG. 8, the defect mark according to the present embodiment is a barcode 72 obtained by coding a defect portion 71 of the optical film 2, and the defect mark detection means 70 is as shown in FIGS. The bar code position detection sensor 73 for detecting the position of the bar code 72, the bar code reader 74 for reading the bar code 72, the bar code position detection sensor 73, and the detection results of the bar code reader 74 are controlled by the control means 90. And a barcode reader control device 75 for sending to the device.

  In particular, the distance between the barcode position detection sensor 73 and the barcode reader 74 is 300 mm or more, preferably 300 mm to 500 mm. This makes it possible to reliably detect the barcode position captured on the upstream side. The distance between the barcode reader 74 and the cross cutter 20 is 750 mm or more, preferably 750 mm to 1200 mm. Thereby, the defect detected at the barcode position can be removed by the cross cutter.

  The discharge mechanism 80 is provided between the cross cutter 20 and the separate conveyor 30 and discharges the optical film 6 including the defective portion 71 cut by the cross cutter 20. As shown in FIG. 9, the discharge mechanism 80 according to the present embodiment includes rolls 81 and 82 and a conveyor 83 stretched between the rolls 81 and 82, and controls the control means 90 described below. Based on this, it is configured so that it can be driven upward (that is, in the direction of arrow E) with respect to the transport direction around the axis 82a of the roll 82.

The control unit 90 is for sequentially driving the cross cutter 20 and the discharge mechanism 80 based on the detection result from the defect mark detection unit 70.
In particular, in the present embodiment, in order to reduce the product loss as much as possible, it is preferable that the cutting length of the optical film 6 including the defective portion 71 is as short as possible. For this reason, in the cross cutter 20 according to the present embodiment, it is preferable that the rotation speed of the knife roll 22 is about 5 to 1000 rpm, and the diameter of the knife roll 22 is about 100 mm to 500 mm.

  Next, a method for discharging a defective portion of the optical film by the optical film cutting apparatus according to the present embodiment will be described. First, the bar code position detection sensor 73 detects the position of the bar code 72 indicating the defective portion 71 of the optical film 2 that has been fed in the direction of arrow A by the pair of feed rolls 16, 16, and then the bar code reader 74. The bar code 72 is read at. These detection results are collected by the barcode reader control device 75 and then sent from the barcode reader control device 75 to the control means 90.

Next, based on the detection result from the defect mark detection means 70, the control means 90 sequentially drives the cross cutter 20 and the discharge mechanism 80. That is, first, based on the control of the control means 90, the cross cutter 20 cuts the optical film including the defective portion 71 by a predetermined length. Next, based on the control of the control means 90, the optical film 6 including the defect portion 71 cut by the cross cutter 20 is driven upward with respect to the transport direction by the discharge mechanism 80 around the axis 82 a of the roll 82. Is discharged toward the receiver 85.
Other configurations are the same as those of the above-described embodiment, and thus description thereof is omitted.

  As mentioned above, although some embodiment concerning this invention was shown, this invention is not limited to embodiment mentioned above, It can apply also to what was changed and improved in the range which does not deviate from the summary of this invention. Needless to say. For example, in the above-described embodiment, the slitter includes a rotary blade as an example. However, since the optical film cutting apparatus according to the present invention includes a cleaning roller, a shear cutter (guillotine cutter) is used instead of the rotary blade. ) Can also be adopted.

It is a schematic side view which shows the side of the cutting device of the optical film concerning one Embodiment of this invention. It is a schematic plan view which shows the plane of the cutting device of the optical film concerning one Embodiment of this invention. It is a schematic explanatory drawing which shows the method of cutting an optical film using the cutting apparatus of the optical film concerning one Embodiment of this invention. It is an expansion outline explanatory view showing the cross cutter concerning one embodiment of the present invention. It is an expansion schematic explanatory drawing which shows the kick roll vicinity concerning one Embodiment of this invention. It is a schematic side view which shows the side of the cutting apparatus of the optical film concerning other embodiment of this invention. It is a schematic plan view which shows the plane of the cutting device of the optical film concerning other embodiment of this invention. It is a schematic explanatory drawing which shows the method of cutting an optical film using the cutting apparatus of the optical film concerning other embodiment of this invention. It is an expansion schematic explanatory drawing which shows the discharge mechanism vicinity concerning other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Original fabric roll 1a Unwinding shaft 1b Bearing 2 Long optical film 3 Slit long optical film 4 Single wafer optical film 5 Side edge 6 Optical film 10 including a defective part Slitter 11 Rotary blades 12, 81 , 82 roll 13 trim cutter 14 discharge roll 15, 85 receiver 16 feeding roll 20 cross cutter 21 knife 22 knife roll 23 plain roll 30 separate conveyor 31, 46 conveyor belt 32, 47 suction hole 40 cleaning roller 41 weak adhesive roll 42 strong Adhesive roll 45 Conveyor 50 Stacking unit 51 Cassette 52 Lifting mechanism 60 Kicking roll 61 Upper roll 62 Lower roll 65 Air blowing means 66 Air blowing port 70 Defect mark detecting means 71 Defective part 72 Bar code 73 Bar code position detection Capacitors 74 bar code reader 75 bar code reader controller 80 discharge mechanism 82a axis 83 conveyor

Claims (11)

A cutting device for cutting out a plurality of optical films from a long optical film,
A roll of optical film,
A slitter that slits the long optical film fed out from the raw roll in a predetermined width in the transport direction of the optical film,
A cross cutter that cuts a slit long optical film in a predetermined length in a direction perpendicular to the transport direction;
By the cutting of this cross cutter, a separate conveyer that separates and conveys a plurality of single-sheet optical films cut out from the slit long optical film, so as not to overlap each other,
A pair of cleaning rollers to remove foreign matter adhering to each optical film conveyed separately;
An optical film cutting apparatus, comprising: an accumulation unit that accumulates the optical films from which foreign substances have been removed. A cutting device for cutting out a plurality of optical films from a long optical film,
A roll of optical film,
A slitter that slits the long optical film fed out from the raw roll in a predetermined width in the transport direction of the optical film,
A cross cutter that cuts a slit long optical film in a predetermined length in a direction perpendicular to the transport direction;
By the cutting of this cross cutter, a separate conveyer that separates and conveys a plurality of single-sheet optical films cut out from the slit long optical film, so as not to overlap each other,
A pair of cleaning rollers to remove foreign matter adhering to each optical film conveyed separately;
A stacking unit for stacking each optical film from which foreign substances have been removed,
Furthermore, a defect mark detecting means for detecting a defect mark indicating a defective portion of the optical film that is provided on the upstream side or the downstream side in the transport direction with respect to the slitter and marked in advance on the optical film,
A discharge mechanism for discharging the optical film including the defective portion provided between the cross cutter and the separate conveyor and cut by the cross cutter;
An optical film cutting device comprising: control means for sequentially driving the cross cutter and the discharge mechanism based on a detection result from the defect mark detection means.   3. The optical film cutting device according to claim 2, wherein the defect mark previously marked on the optical film is a defect mark marked by a marking means or a barcode obtained by coding a defective portion of the optical film.   The optical film cutting device according to any one of claims 1 to 3, wherein a trim cutter for cutting both side edges of the long optical film is provided upstream of the cross cutter in the transport direction.   The cross cutter is composed of a knife roll provided with at least one knife in the longitudinal direction on the outer peripheral surface, and a rotary cutter which is located below the knife roll and has a plain roll whose outer peripheral surface is in contact with the blade edge of the knife. The optical film cutting device according to any one of claims 1 to 4.   The said separate conveyor is comprised from several conveyor belts, and each conveyor belt is arrange | positioned so that the space | interval of mutually adjacent conveyor belts may spread at predetermined intervals toward the said conveyance direction downstream. The optical film cutting device according to claim 5.   The optical film cutting device according to claim 1, wherein the separate conveyor includes an adsorption mechanism that conveys the optical film while adsorbing and holding the optical film on a conveyance surface.   Provided between the cleaning roller and the stacking unit is a kick roll that is composed of an upper roll and a lower roll, and the upper roll and / or the lower roll has a rotational speed faster than the conveying speed of the optical sheet, and is located near the lower roll. The optical film cutting device according to any one of claims 1 to 7, further comprising an air blowing means having an air blowing port facing a back surface of the optical film kicked out by the kicking roll.   The apparatus for cutting an optical film according to any one of claims 1 to 8, wherein the conveyance speed of the optical film is 5 to 50 m / min. A method of producing an optical film by cutting out a plurality of single-wafer optical films from a long optical film,
A process of drawing out a long optical film from a roll of optical film;
A slitting process for slitting the unwound optical film with a predetermined width in the transport direction of the optical film;
A cutting step of cutting the slit long optical film in a direction perpendicular to the transport direction by a predetermined length;
By this cutting, a process of separating and transporting a plurality of single-sheet optical films cut out from the slit long optical film, so as not to overlap each other;
Removing foreign matter adhering to each optical film separated and transported;
And a step of accumulating each optical film from which foreign substances have been removed. A method of producing an optical film by cutting out a plurality of single-wafer optical films from a long optical film,
A process of drawing out a long optical film from a roll of optical film;
A slitting process for slitting the unwound optical film with a predetermined width in the transport direction of the optical film;
A cutting step of cutting the slit long optical film in a direction perpendicular to the transport direction by a predetermined length;
By this cutting, a process of separating and transporting a plurality of single-sheet optical films cut out from the slit long optical film, so as not to overlap each other;
Removing foreign matter adhering to each optical film separated and transported;
Collecting each optical film from which foreign matter has been removed, and
Further, before or after the slitting step, detecting a defect mark indicating a defective portion of the optical film that is previously marked on the optical film;
Based on the detection result, cutting the optical film including the defective portion in the cutting step,
And a step of discharging the optical film including the cut defect portion.

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