JP2014166928A - Apparatus and method for cutting glass film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable appropriate management of flexural stress with a supporting member and a holding member according to the thickness of a glass film and avoid interference between cut end surfaces immediately after cutting, in cutting a glass film without formation of a scribe line.SOLUTION: A glass film cutting apparatus includes a supporting member 8 which is capable of protruding to, advancing to and retreating from the back surface or the front surface of a glass film 3 and has a top part 8a capable of coming in contact with or separating from a cutting schedule line 6 of the glass film 3, holding members 9 which hold the glass film 3 at isolated positions on both sides of the cutting schedule line 6 and a crack imparting member 10 which forms and progresses an initial crack in a part of the cutting schedule line 6, in a state where the surface side of the glass film 3 is deformed convexly by the supporting member 8 and the holding members 9 to generate a flexural stress M in the cutting schedule line 6 of the glass film 3, and both holding members 9 are movable in a direction along the surface of the glass film 3 and perpendicular to the cutting schedule line 6.

Description

  The present invention relates to a technique for cutting a glass film, which is a thin glass plate having flexibility, along a planned cutting line.

  As is well known, for flat glass displays (hereinafter referred to as FPD) such as liquid crystal displays, plasma displays, field emission displays (including surface emission displays), electroluminescence displays, and organic EL displays, for organic EL lighting. The actual situation is that thinning is promoted in glass plates used in the production of tempered glass, which is a constituent element of touch panels, and in glass panels used in panels of solar cells.

  In order to deal with such a situation, in recent years, development is progressing so that these glass plates can be used as a thin glass film having flexibility. When cutting this type of glass film, conventionally, a method has been employed in which a scribe line is engraved on a planned cutting line of the glass film and the scribe line is split along the scribe line (see Patent Document 1). ). However, the cutting end surface by such a method not only causes a decrease in strength of the cutting end surface due to the presence of minute cracks generated when the scribe line is engraved on the cutting end surface, but also the scribe line. The fine glass powder generated at the time of engraving adhered to the glass film surface and caused the glass film to be contaminated. Therefore, in order to avoid such a problem, Patent Documents 2 and 3 disclose a method of cutting a glass film without engraving a scribe line.

  Specifically, the glass film cutting mechanism (dividing mechanism) disclosed in Patent Document 2 includes a pair of rollers through which the moving glass film passes between each other, and the pair of rollers has a first curved surface. A roller and a second roller having a flat surface, the flat surface of the second roller being inclined with respect to the surface of the moving glass film and acting on the glass film, A stress profile is generated. And this stress profile is set as the structure which cut | disconnects a glass film, without engraving a scribe line by producing | generating a crack in the regular position of a glass film.

  In addition, the glass film cutting device disclosed in Patent Document 3 is in a state where the glass film is bent such that the surface side of the glass film is convex and bending stress (tensile stress) is generated in the planned cutting line. The support member supports the back side of the glass film, and includes a holding member that holds the glass film in a fixed position at spaced positions on both sides of the support member. And under such a state, the crack applying means forms an initial crack in a part of the planned cutting line, and advances the initial crack, thereby cutting the glass film without engraving the scribe line. It is supposed to be configured.

JP-A-4-228438 Special table 2012-507466 gazette JP 2011-121791 A

  However, since the method disclosed in Patent Document 2 described above requires cutting while applying an excessive force to the glass film, an expensive device with high rigidity is required, and there is a problem in durability and the like. In addition to the above, there is a problem that damage to the glass film is caused because of great damage, and the success rate of cutting the glass film is low.

  On the other hand, the technique disclosed in Patent Document 3 is based on the thickness of the glass film because the holding members present on both sides of the support member for applying bending stress to the glass film are installed at fixed positions. There is a problem that it becomes difficult or impossible to make the bending stress an appropriate size, and the success rate of cutting becomes low, resulting in a decrease in production efficiency.

  In addition, in this method, since the holding member is installed at a fixed position as described above, a situation in which the cut end surfaces interfere with each other immediately after the cutting of the glass film occurs, so that the cut end surface is not cracked or damaged. As a result, the quality is degraded, and the strength of the cut end surface is reduced.

  The present invention has been made in view of the above circumstances, and in the case of cutting a glass film without forming a scribe line, appropriate management of bending stress between the support member and the holding member according to the thickness of the glass film. It is an object of the present invention to make it possible to avoid the interference between the cut end faces immediately after cutting.

  An apparatus according to the present invention, which has been created to solve the above-mentioned problems, is a glass film cutting apparatus that cuts a glass film along a planned cutting line, and projects and retracts relative to the back surface or the surface of the glass film. A supporting member that is movable and has a top portion that can be brought into contact with and separated from a planned cutting line of the glass film, a holding member that holds the glass film at positions separated from both sides of the planned cutting line, and the supporting member In a state in which bending stress is generated in the planned cutting line of the glass film by projecting the glass film and holding the both holding members so that the front side or the back side of the glass film is convex. A crack imparting member for forming an initial crack in a part of the planned cutting line and causing the initial crack to propagate along the planned cutting line. , Said two holding members, characterized in that it has movable in the direction and perpendicular to the cutting line in the direction along the surface of the glass film.

  According to such a configuration, first, when bending stress (tensile stress) is generated by projecting movement of the support member so that the front side or the back side of the glass film is convex, both sides of the support member When the holding member that holds the glass film at a position spaced apart (is held non-slidable) is installed at a fixed position as in the prior art, the bending stress required according to the thickness of the glass film is obtained. I can't. However, in the present invention, since both the holding members are movable in the direction along the glass film surface and in the direction perpendicular to the planned cutting line, the support member protrudes and the surface side of the glass film or By making both holding members move appropriately in the process of generating bending stress by making the back side convex, bend the appropriate size according to the thickness of the glass film to the planned cutting line of the glass film Stress can be generated. Therefore, stable cutting along the planned cutting line of the glass film is possible, and productivity is improved.

  Second, in the state in which the bending stress is generated, the crack imparting member forms an initial crack in a part of the planned cutting line, and this initial crack propagates over the entire length of the planned cutting line. Then, immediately after cutting the glass film, when the holding member holding the glass film at positions separated on both sides of the support member is installed at a fixed position as in the past, the cut end faces of the glass film are This can lead to interference (contact). However, in the present invention, since both the holding members are movable in the direction along the glass film surface and in the direction perpendicular to the planned cutting line, interference between the cut end surfaces of the glass film can be avoided. Further, the occurrence of cracks and damage on the cut end face is difficult to occur, and the strength of the cut end face is improved, which is advantageous in terms of quality.

  As the configuration with the specific action of the former (first) of the glass film cutting apparatus having the above configuration, the support member protrudes and bends with the front side or the back side of the glass film convex. After the holding members move so as to approach each other in the process of generating stress, the crack imparting member forms an initial crack in a part of the planned cutting line, and the initial crack is removed from the planned cutting line. It is preferable to make it progress along.

  That is, when the appropriate bending stress is managed according to the thickness of the glass film by the supporting member and the holding members arranged on both sides of the supporting member, the supporting member protrudes to move the front side or the back side of the glass film. In the process of generating the bending stress by forming the convex shape, the holding members may be moved so as to approach each other following the progress of the convex shape. In detail, when the thickness of the glass film is large, the glass film has a characteristic that it is difficult to bend when the convex shape proceeds, so even if the gap between the two holding members is long, A glass film having a large thickness generates a bending stress having a size necessary for reliably developing the initial crack. Conversely, when the thickness of the glass film is small, the glass film has a characteristic of being easily bent during the above-described progress of the convex shape, so that the gap dimension between the two holding members is short from a long state. By doing so, it is possible to generate a bending stress having a magnitude necessary for reliably developing the initial crack in the glass film having a small thickness. Therefore, the bending stress is suitably managed by changing the approaching movement amount of both holding members according to the difference in thickness of the glass film.

  Further, as a configuration with the specific action of the latter (second) of the glass film cutting apparatus having the above configuration, the crack imparting member forms an initial crack in a part of the planned cutting line and the initial It is preferable that the holding members move so as to be separated from each other when the crack is extended over the entire length of the planned cutting line.

  That is, immediately after the initial crack propagates over the entire length of the cutting line and the glass film is cut, the cut end faces of the two glass films after cutting are in a state where they can interfere with each other. If the holding members move so as to be separated from each other, the cut end faces of the glass film are also separated from each other, so that interference between both the cut end faces is reliably avoided.

  In the above configuration, it is preferable that the top portion of the supporting member has the same length as the planned cutting line or longer than that and extends in a straight line, and has a square cross section.

  In this way, the initial crack can be reliably propagated over the entire length of the planned cutting line of the glass film, and an appropriate bending stress can be generated by making the top section square. In addition, the initial crack progresses in a straight line without meandering along the top.

  In the above configuration, each of the holding members may include a suction portion that sucks the back surface of the glass film under a negative pressure at the tip.

  If it does in this way, since only the back surface of a glass film will contact the adsorption | suction part of a holding member, a contact damage etc. will not attach to the surface of a glass film, and it will become possible to ensure high quality.

  In the above configuration, the both holding members may be configured to sandwich the front and back surfaces of the glass film.

  If it does in this way, it becomes possible to hold | maintain a glass film reliably by raising pinching force appropriately.

  The method according to the present invention, which was created to solve the above-mentioned problems, is a glass film cutting method for cutting a glass film along a planned cutting line, and the protrusion moves relative to the back surface or the surface of the glass film. And a support member that can be moved backward and has a top portion that can be brought into contact with and separated from the planned cutting line of the glass film, a holding member that holds the glass film at positions separated from both sides of the planned cutting line, and the support. A state in which a bending stress is generated in the planned cutting line of the glass film by causing the member to project the glass film and holding the two holding members so that the front side or the back side of the glass film is convex. A crack imparting member that forms an initial crack in a part of the planned cutting line and propagates the initial crack along the planned cutting line The holding member is attached to the surface of the glass film at least one of the process of generating a bending stress in the planned cutting line and immediately after the initial crack has propagated over the entire length of the cutting planned line. And moving in a direction perpendicular to the planned cutting line.

  This method is substantially the same in configuration as the apparatus according to the present invention described in the beginning, and also has at least one of the former (first) and the latter (second) in terms of operational effects. Therefore, the description thereof is omitted here.

  As described above, according to the present invention, when the glass film is cut without forming a scribe line, it is possible to appropriately manage the bending stress between the support member and the holding member according to the thickness of the glass film, and to cut the glass film. Interference between the cut end faces immediately after is avoided.

(A) is a top view which shows the whole structure of the conveyance path | route with which the glass film cutting device which concerns on 1st Embodiment of this invention is applied, (b) is the front view. It is a schematic perspective view which shows the initial state of the glass film cutting device which concerns on 1st Embodiment of this invention. It is a schematic perspective view which shows the cutting process of the glass film cutting device which concerns on 1st Embodiment of this invention. It is a schematic front view which shows the initial state of the glass film cutting device which concerns on 1st Embodiment of this invention. It is a schematic front view which shows the cutting process of the glass film cutting device which concerns on 1st Embodiment of this invention. It is a schematic front view which shows the cutting process of the glass film cutting device which concerns on 1st Embodiment of this invention. It is a schematic front view which shows the state immediately after the cutting | disconnection of the glass film cutting device which concerns on 1st Embodiment of this invention. It is a schematic front view which shows the cutting process at the time of applying the glass film cutting device which concerns on 1st Embodiment of this invention to a thick glass film. It is a schematic front view which shows the cutting process at the time of applying the glass film cutting device which concerns on 1st Embodiment of this invention to a glass film with small thickness. It is a figure which shows the characteristic at the time of applying the glass film cutting device which concerns on 1st Embodiment of this invention to the glass film from which thickness differs. It is a schematic front view which shows the cutting process of the glass film cutting device which concerns on 2nd Embodiment of this invention. It is a schematic front view which shows the cutting process of the glass film cutting device which concerns on 3rd Embodiment of this invention.

  Hereinafter, a glass film cutting device (hereinafter simply referred to as a cutting device) according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows an example to which the cutting device 1 according to the first embodiment of the present invention is applied, and exemplifies a mode in which continuous processing is performed. As shown in the figure, in this continuous process, a belt-shaped glass film 3 is unwound from a glass roll 2 arranged at the upstream end, and is conveyed on a roller conveyor 4 having a large number of rollers. And with the 1st cutting stage 5 provided in the middle of the conveyance path | route, the strip | belt-shaped glass film 3 is first cut | disconnected by the single cutting device 1 along the cutting planned line 6 extended in the direction orthogonal to a longitudinal direction. . Thereby, a rectangular glass film having cut end faces on two parallel sides is obtained. Thereafter, the second cutting stage 7 provided immediately downstream of the first cutting stage 5 is used to cut the glass film 3 along the planned cutting lines 6 at the other two edges by the two cutting devices 1. Disconnect. Thereby, the rectangular glass film 3 which has a cutting end surface on four sides is obtained, and this glass film 3 is conveyed by the roller conveyor 4 of the most downstream side. In addition, the thickness of the glass film 3 is 300 micrometers or less, for example, Preferably it is 200 micrometers or less, More preferably, it is 100 micrometers or less, More preferably, it is 50 micrometers or less.

  2 and 3 exemplify a schematic configuration of a main part of the cutting device 1. As shown in each of these drawings, the cutting device 1 has a support member 8 having a cross section of an equilateral triangle or an isosceles triangle as a main component, and a top portion 8 a longer than the planned cutting line 6 of the glass film 3. And a pair of holding members 9 that are spaced apart from each other on both sides of the support member 8 and are longer than the planned cutting line 6 of the glass film 3, and a part of the planned cutting line 6 of the glass film 3. A crack imparting member 10 for forming an initial crack is provided on the upper end of the one end surface in the present embodiment.

  The support member 8 has a surface formed of a hard resin (for example, a resin-coated metal surface), PEEK, or the like, and an angle α (see FIG. 4) of the top 8a is 60 degrees to 120 degrees or 60 degrees. It is preferable that the angle is set to ˜90 degrees. The top 8a of the support member 8 does not have to be a perfect square in cross section, and may be a slight curved surface. The holding member 9 is provided with a porous adsorbing portion that sucks the back surface of the glass film 3 under a negative pressure at the tip (upper end), and the tip surface is flat. Therefore, the surface of the glass film 3 is not in contact with other members. The crack imparting member 10 is made of a metal, a diamond grindstone, or a material obtained by adhering diamond abrasive grains to a base material, and has a sharp tip (lower end).

  The support member 8 can be protruded and retracted with respect to the back surface of the glass film 3 by a driving means including a fluid pressure cylinder such as an air cylinder (not shown) or a ball screw mechanism (in this embodiment, it can be moved up and down). It is said that. The holding member 9 is driven in the direction along the surface of the glass film 3 and perpendicular to the planned cutting line 6 (ab direction) by a driving means including a fluid pressure cylinder such as an air cylinder (not shown) or a ball screw mechanism. ) Can be moved. Further, the crack imparting member 10 is moved closer to one end portion of the scheduled cutting line 6 on the surface of the glass film 3 by driving means including a fluid pressure cylinder such as an air cylinder (not shown), a ball screw mechanism, or a solenoid actuator. And it is possible to move away (in this embodiment, it can move up and down).

  The cutting device 1 having the above configuration cuts the glass film 3 with the following actions. In addition, each figure used in the following description is the schematic which looked at the cutting device 1 from the front.

  FIG. 4 shows an initial positional relationship in a state in which the glass film 3 is set at the time of cutting by the cutting device 1. As shown in the figure, the glass film 3 is held in a flat state by a negative pressure suction force F on a suction portion (suction surface) 9a of a holding member 9 that is separated from both sides of the support member 8. . At this time, the support member 8 stands by at the backward movement end (downward movement end), and the crack imparting member 10 stands by at the separation movement end (upward movement end).

  From such a state, as shown in FIG. 5, the support member 8 protrudes (moves upward) and pushes up the glass film 3 from the back side. In this case, the top 8 a of the support member 8 is in contact with the entire length of the planned cutting line 6 of the glass film 3. Then, simultaneously with the push-up of the glass film 3 due to the protruding movement of the support member 8, the two holding members 9 move in the direction of the arrow b so as to approach each other while holding the glass film 3. In this process, the glass film 3 is bent so that the planned cutting line 6 is at the uppermost position, and bending stress (tensile stress on the surface side of the glass film 3) M is generated along the planned cutting line 6. To do.

  Then, as shown in FIG. 6, when the support member 8 reaches the upper moving end and stops, when the two holding members 9 reach the moving end and stop, the crack imparting member 10 is made of the glass film 3. An initial crack is formed at one end of the planned cutting line 6 by approaching (downwardly moving) the planned cutting line 6 and contacting the planned cutting line 6 with a predetermined pressing force. And this initial crack progresses along the tensile stress of the surface side of the glass film 3 along the cutting projected line 6, and the cutting | disconnection of the glass film 3 is completed when it progresses over the full length.

  Immediately after this, when the glass film 3 is moved as it is or when the support member 8 is moved downward, the two cut end faces 3a facing each other interfere with each other, and contact cuts or Cracks and the like are generated, and the strength of the cut end surface 3a is reduced. Therefore, as shown in FIG. 7, immediately after the crack imparting member 10 moves up, the two holding members 9 are moved in the direction of the arrow a so as to be separated from each other. Thereby, the above problems are avoided.

  8 and 9 illustrate the difference in the amount of movement of the two holding members 9 when the thickness of the glass film 3 is different. As shown in FIG. 8, when the thickness of the glass film 3 is large, even if the amount of movement of the two holding members 9 in the direction of the arrow b is small, the initial crack is extended over the entire length in the planned cutting line 6. Sufficient bending stress M is generated that is sufficient for progress. On the other hand, as shown in FIG. 9, when the thickness of the glass film 3 is small, by increasing the amount of movement of the two holding members 9 in the arrow b direction, Sufficient bending stress M is generated to cause the crack to propagate over the entire length. Therefore, the amount of movement of the two holding members 9 in the direction of the arrow b needs to be changed according to the thickness of the glass film 3. In this case, it is necessary to move the support member 8 up to a higher position when the glass film 3 is smaller than when the glass film 3 is thick.

  FIG. 10 shows the relationship between the height position of the support member 8 and the distance between the two holding members 9 when the glass film 3 is cut for each of the cases where the thickness of the glass film 3 is 50 μm, 100 μm, 150 μm, and 200 μm. It shows the relationship. In the drawing, the height (H) of the support member means the height of the upper end of the support member 8 when the height of the upper end of the holding member 9 is 0 mm.

  According to FIG. 10, when the thickness of the glass film 3 is 50 μm, the range surrounded by a thin solid line, that is, the support member height is about 6 to 17 mm and the holding member interval is about 35 to 150 mm. Can be cut, and if the range surrounded by a thick solid line, that is, the support member height is about 9.5 to 13 mm and the holding member interval is about 50 to 75 mm, the optimum cutting is possible. Is possible. Further, when the thickness of the glass film 3 is 100 μm, if the range surrounded by a thin dotted line, that is, the support member height is about 4 to 13 mm and the holding member interval is in the range of about 60 to 180 mm, cutting is performed. If the range surrounded by the thick dotted line, that is, the support member height is about 8 to 10 mm and the holding member interval is about 80 to 100 mm, optimum cutting is possible. Furthermore, in the case where the thickness of the glass film 3 is 150 μm, if the range is surrounded by a thin alternate long and short dash line, that is, the support member height is about 4 to 9 mm and the holding member interval is about 95 to 170 mm, Cutting is possible, and optimal cutting is possible if it is within the range surrounded by the thick dashed line, that is, the support member height is about 5 to 8 mm and the holding member interval is about 110 to 125 mm. Further, when the thickness of the glass film 3 is 200 μm, the range surrounded by the thin two-dot chain line, that is, the support member height is about 3 to 7.5 mm and the holding member interval is about 130 to 195 mm. If it is possible, cutting is possible, and if the range surrounded by the thick two-dot chain line, that is, the supporting member height is about 4 to 6 mm and the holding member interval is within the range of about 145 to 165 mm, the optimum cutting is performed. Is possible.

  FIG. 11 is a front view showing an outline of a main part of the cutting device 1 according to the second embodiment of the present invention. As shown in the figure, the cutting device 1 according to the second embodiment differs from the first embodiment described above in that the two holding members 9 each sandwich the glass film 3. It is a point comprised by the member 9a and the back surface side member 9b. In this case, the buffer member 9aa is attached to the surface side member 9a at a portion that contacts the surface of the glass film 3, and the surface of the glass film 3 is protected by the buffer member 9aa. The cutting device 1 according to the second embodiment also performs the same operation as the cutting device 1 according to the first embodiment described above.

  FIG. 12 is a front view showing an outline of a main part of the cutting device 1 according to the third embodiment of the present invention. As shown in the figure, the cutting device 1 according to the third embodiment is different from the first embodiment described above in that the support member 8 can project and retract on the surface of the glass film 3. The back side of the glass film 3 is convex, and the bending stress can be generated and the crack imparting member 10 can be moved toward and away from the back side of the glass film 3 (movable up and down) ). Therefore, the crack imparting member 10 forms an initial crack by moving upward and contacting one end of the planned cutting line 6 of the glass film 3 which is convex on the back surface side and has a bending stress. It is like that. Such a configuration can be similarly applied to the second embodiment (the cutting device 1 shown in FIG. 11).

  In the first and second embodiments, the crack imparting member 10 moves down from the front surface side of the glass film 3, and in the third embodiment, the crack imparting member 10 rises from the rear surface side of the glass film 3. However, in the first and second embodiments, the crack imparting member 10 is moved upward from the back side of the glass film 3, and the above-mentioned crack is formed. In the third embodiment, the crack imparting member 10 may move downward from the surface side of the glass film 3 to form an initial crack. Furthermore, the crack imparting member 10 may be moved in a direction parallel to the longitudinal direction of the top portion 8a of the support member 8 to form an initial crack.

  In the above embodiment, the present invention is applied to continuous processing for cutting the edge portion of the glass film in the middle of the conveyance path. However, when cutting a plurality of rectangular glass films by batch processing, The present invention can be similarly applied to a case where a portion other than the edge portion of the film is cut.

  Furthermore, in the above embodiment, the upper cross section of the support member is triangular. However, the shape of the cross section is not limited to a triangle as long as the top angle is the same as that described above.

  In the above embodiment, one holding member is provided on each side of the support member, but a plurality of holding members may be provided.

DESCRIPTION OF SYMBOLS 1 Glass film cutting device 3 Glass film 6 Planned cutting line 8 Support member 8a Top part 9 of support member Holding member 9a Suction part 10 of holding member Crack provision member

Claims (7)

  A glass film cutting apparatus for cutting a glass film along a planned cutting line, wherein the glass film can be protruded and retracted with respect to a back surface or a front surface of the glass film, and a top portion is in contact with the planned cutting line of the glass film. A support member that can be separated, a holding member that holds the glass film at positions separated from both sides of the planned cutting line, the support member causes the glass film to project, and the two holding members are made of the glass film. The initial crack is formed in a part of the planned cutting line in a state where bending stress is generated in the planned cutting line of the glass film by holding the front side or the back side so as to be convex. And a crack imparting member that propagates along the planned cutting line, and the holding members are arranged in a direction along the surface of the glass film. Glass film cutting apparatus characterized by and was movable in a direction perpendicular to the cutting line.   After the supporting member has moved and moved so that the two holding members approach each other in the process of generating a bending stress by projecting the front side or the back side of the glass film, the crack imparting member The glass film cutting device according to claim 1, wherein an initial crack is formed in a part of the planned cutting line and the initial crack is propagated along the planned cutting line.   When the crack imparting member forms an initial crack in a part of the planned cutting line and the initial crack propagates over the entire length of the planned cutting line, the holding members move so as to be separated from each other. The glass film cutting device according to claim 1 or 2, wherein   4. The glass film according to claim 1, wherein a top portion of the support member has a length equal to or longer than the planned cutting line and extends in a straight line, and has a square cross section. Cutting device.   The glass film cutting device according to any one of claims 1 to 4, wherein the both holding members are provided with suction portions that suck negative pressure of the back surface of the glass film at the front ends.   The glass film cutting apparatus according to any one of claims 1 to 4, wherein the both holding members are configured to sandwich the front and back surfaces of the glass film.   A glass film cutting method for cutting a glass film along a planned cutting line, wherein the glass film can be protruded and retracted with respect to a back surface or a front surface of the glass film, and a top portion is in contact with the planned cutting line of the glass film. A support member that can be separated, a holding member that holds the glass film at positions separated from both sides of the planned cutting line, the support member causes the glass film to project, and the two holding members are made of the glass film. The initial crack is formed in a part of the planned cutting line in a state where bending stress is generated in the planned cutting line of the glass film by holding the front side or the back side so as to be convex. A crack imparting member that propagates along the planned cutting line, generating a bending stress on the planned cutting line, and the cutting At least one of the time immediately after the initial crack has developed over the entire length of the planned line, the two holding members are moved in a direction along the surface of the glass film and in a direction perpendicular to the planned cutting line. A method for cutting a glass film.

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