JP5510650B2 - Glass film cleaving method and manufacturing method - Google Patents

Description

  The present invention relates to a technique for cleaving a glass film and dividing it in the width direction by local heating along a planned cutting line extending in the feeding direction and thermal stress generated with cooling of the heating region while feeding the glass film. Regarding improvement.

  As is well known, a flat panel display (FPD) represented by a liquid crystal display, a plasma display, an organic EL display and the like has become the mainstream in recent years. Since the weight reduction of these FPDs is promoted, the glass substrate used for the FPD is currently being made thin (glass film).

  In addition, organic EL is being used as a flat light source such as a light source for indoor lighting by causing only three colors (for example, white) to emit light without causing the three primary colors to be flickered by a TFT unlike a display. In addition, since the organic EL lighting device can freely deform the light emitting surface if the glass substrate is flexible, the glass substrate used in the lighting device also has sufficient flexibility. In view of this, a significant reduction in thickness is being promoted.

  As a method of cleaving a glass substrate used in these FPDs and lighting devices, a scribe of a predetermined depth is engraved on the front or back surface of the glass substrate along a planned cutting line, and then bending stress is applied to the scribe. A method of cleaving the glass substrate by applying the above is general.

  However, the method of cleaving the glass substrate by bending stress in this way is not only very difficult to engrave scribes when the glass substrate is thinned to the state of a glass film, but it is also formed in a fractured section There may be a problem that a significant decrease in strength is caused by a defect (for example, a lateral crack).

  In addition, when it is required to continuously cleave the glass film while sequentially feeding the glass film, it becomes difficult to continuously apply a bending stress to the scribe engraved on the glass film. There is also a problem.

  Therefore, a glass film cleaving technique using thermal stress has been adopted in order to eliminate the disadvantages of the glass film cleaving technique utilizing bending stress.

  Specifically, for example, according to Patent Document 1, the edge in the width direction of the band-shaped plate-like glass is continuously cleaved by the thermal stress generated by the local heating by the laser and the cooling by the cooling device. It is disclosed.

  In the same document, the advancing direction of the edge part (edge part including the ear part) after cleaving of the band-shaped plate glass is changed from the horizontal zone to the vertically downward direction, and the width direction is formed at the lower end. After cleaving and discarding, the edge of the strip-shaped sheet glass after cleaving is cut off and the remaining effective glass portion is sent to the horizontal direction without changing the traveling direction, and then the predetermined length. It is disclosed that a glass plate as a product is obtained by cleaving in the width direction. In this way, after the glass plate is cleaved, the track of the edge portion separates downward with respect to the track of the effective glass portion, so that the split section of the effective glass portion and the split section of the edge portion are It is possible to reduce the rate of occurrence of a situation where they are rubbed against each other and broken.

JP 2000-335928 A

  By the way, when the glass film is cleaved by thermal stress, the desired thermal stress is applied by forcibly giving a temperature distribution in the thickness direction to the glass film in the vicinity of the planned cutting line by local heating and cooling of the heating region. Give rise to That is, according to the aspect of the temperature distribution in the thickness direction of the glass film that generates thermal stress, the aspect of the split section of the glass film also changes. Therefore, as shown in FIG. 17, the temperature distribution in the thickness direction of the glass film G (isothermal line indicated by reference numeral 20 in the figure) generated by local heating and cooling of the heating region is a vertical cross section (cleaving line). If it is asymmetric with respect to the planned surface 21, a part or all of the split section 22 is likely to be inclined away from the vertical section 21.

  And if a fractured surface inclines in this way, the fractured surface of one glass film will interfere with the fractured surface of the other glass film in the thickness direction. Therefore, as disclosed in Patent Document 1, after the cleaving, the glass of one glass film is moved downward (thickness direction) relative to the trajectory of the other glass film. There are cases where the inclined section of the film is in the way and interference between the two sections proceeds. In this case, the broken sections of both glass films rub against each other, and the glass film may be damaged such as chipping or cracking, or a micro defect may be formed on the broken section and the strength may be significantly reduced. .

  Here, it is generally considered that it is not preferable that the cut section of the glass film is inclined, and the temperature distribution in the thickness direction of the glass film that occurs at the time of cleaving is relative to the vertical section passing through the planned cutting line. Usually, measures are taken to make them symmetrical. Specifically, by finely adjusting the local heating region and the cooling region with respect to the planned cutting line, the temperature distribution is controlled so that the glass film has a split section that deviates significantly from the vertical section passing through the planned cutting line. Measures to prevent are often taken.

  However, even if such measures are taken, it is virtually impossible to make the temperature distribution in the thickness direction of the glass film completely symmetric with respect to the vertical cross section passing through the planned cutting line. A part or all of the cut section is inevitably slightly inclined from the vertical section passing through the planned cutting line. In addition, in this case, since the inclination of the cut section of the glass film is very small with respect to the vertical section passing through the planned cutting line, the aspect of the cut section is also affected by slight fluctuations in the external environment. easy. As a result, the inclined direction of the cut section relative to the vertical section passing through the planned cutting line changes irregularly, and the direction in which interference between adjacent cut sections is canceled after cleaving is not uniquely determined, and rubbing between the cut sections. It has been virtually impossible to completely prevent contact.

  In view of the above circumstances, when the present invention is continuously cleaved by thermal stress and divided in the width direction while feeding the glass film, among the divided glass films, rubbing of the divided sections between adjacent ones It is a technical problem to reduce as much as possible.

  The glass film cleaving method according to the present invention, which was created to solve the above problems, occurs with local heating along the planned cutting line extending in the feeding direction and cooling of the heating region while feeding the glass film. In the method of cleaving a glass film, the glass film is divided in the width direction by continuously cleaving the glass film along the planned cutting line due to thermal stress. In order to incline in a predetermined direction with respect to the cleaving step of cleaving the glass film continuously, and so as not to cause interference with the inclination of the cleaved section of the adjacent glass film after cleaving, The track of one adjacent glass film is separated to either the front surface side or the back surface side relative to the track of the other adjacent glass film. Characterized in that it comprises a separation step of.

  According to such a method, in the cleaving process, the cleaved surface of the glass film is positively inclined in a predetermined direction with respect to a vertical cross section passing through the cleaved planned line. For this reason, the direction in which the interference caused by the inclination of the cut surfaces of the adjacent glass films after the cleaving is canceled is relative to the other glass film adjacent to the adjacent glass film, according to the inclination direction of the cut surfaces. It is determined in advance either to be separated to the front surface side or relatively to the rear surface side. Therefore, in the separation step, the track of one glass film adjacent after the cleaving is relatively surface with respect to the track of the other adjacent glass film so that the interference due to the inclination of the split sections is released. It is possible to move away from either the side or the back side.

  In the above method, in the cleaving step, when the thermal stress is generated, the temperature distribution in the thickness direction of the glass film is asymmetric with respect to a vertical cross section passing through the planned cutting line, so that the cleaved section is Can be tilted.

  That is, if the temperature distribution in the thickness direction of the glass film is asymmetric with respect to the vertical section passing through the planned cutting line, the thermal stress generated near the planned cutting line based on this temperature distribution is also asymmetric with respect to the vertical section. Therefore, the fractured surface that is cleaved by the thermal stress is inclined with respect to the vertical profile.

  In this case, the temperature distribution passes through the planned cutting line by bringing the member having good thermal conductivity asymmetrically with respect to the planned cutting line (hereinafter referred to as a heat conductive member) into the glass film. It may be asymmetric with respect to the vertical cross section.

  That is, in the portion where the heat conductive member is in close contact, the propagation speed of heat propagating in the thickness direction of the glass film is increased. Therefore, if the thermally conductive member is brought into close contact with the planned cutting line, the one side region of the glass film that is divided with the vertical cross section passing through the planned cutting line as a boundary is compared with the other side region. The heat propagation speed becomes relatively high. As a result, the temperature distribution in the thickness direction of the glass film is biased toward the region where the heat propagation speed increases, and is asymmetric with respect to the vertical cross section passing through the planned cutting line.

  In addition, in the state where the center position in the width direction of the heating region by the local heating is made coincident with the planned cutting line, the temperature distribution is obtained by deviating the center position in the width direction of the cooling region by the cooling from the planned cutting line. You may make it become asymmetrical with respect to the vertical cross section which passes along the said planned cutting line.

  If it does in this way, gap will arise between the width direction center position of the heating field by local heating, and the width direction center position of the cooling field by cooling. Therefore, in the glass film, one of the regions divided in two with the vertical cross section passing through the planned cutting line as a boundary, the region on the one side biasing the center position in the width direction of the cooling region is more than the region on the other side. Since the glass film is relatively strongly cooled, the temperature distribution in the thickness direction of the glass film is asymmetric with respect to a vertical cross section passing through the planned cutting line.

  Said method WHEREIN: In the said cleaving process, while the said glass film is divided | segmented into three or more site | parts in the width direction, the site | part which has the said cleave | schedule planned line in the width direction both sides is formed in the width direction both sides It is preferable that the cleaved surfaces are cleaved so as to be inclined in directions that are symmetrical with each other in the width direction.

  In this way, the portion where the both sides in the width direction are formed by the split cross section is symmetrical with respect to the trajectory of the portion of the portion adjacent to the both sides in the width direction because the inclined direction of the cut cross section is symmetric in the width direction. The tracks can be separated in the same direction. In this case, in the separation step after the cleaving, the glass film trajectory is relatively separated from the front side and the relatively separated from the back side appears alternately in the width direction. Even if the number of divisions due to film cleaving increases, the amount of change in the trajectory of each glass film can be kept small. In addition, after the cleaving, the orbit of each glass film is distributed substantially evenly on the front side and the back side, so that an unreasonable force that causes twisting on the glass film portion that has not reached the cleaving step does not act. .

  In the above method, each glass film separated in the separation step may be wound around a core in a roll shape.

  In this way, each glass film separated in the separation step is wound around the core in a roll shape, so that the storage and packaging of the product glass film cleaved to a predetermined width can be compact and It can be easily performed. In this case, there is also an advantage that work continuity is ensured and work efficiency is improved.

  In the above method, an original glass film roll formed by winding the glass film before cleaving in a roll shape around a core is manufactured, and in the cleaving step, the glass film drawn from the original glass film roll is You may make it supply.

  In this way, work to perform these work steps compared to the case of performing the cleaving step and the separation step while directly feeding the glass film from the forming step of forming the glass film from molten glass or the like. Space can be secured easily. In other words, the downstream area that is continuous with the molding process is usually subject to space constraints due to the relationship with existing equipment. Therefore, after the glass film sent from the forming process is once wound up in a roll around the core to produce the original glass film roll, the glass film is drawn from the original glass film roll at another location and cleaved. The process and the separation process are advantageous from the viewpoint of securing the work space.

  In the above method, the local heating is preferably performed by a laser.

  If it does in this way, the local heating of a glass film can be efficiently performed with the irradiation heat of a laser. As the laser, a carbon dioxide laser is preferably used. In this case, the absorption wavelength of the glass can be made appropriate, and local heating can be easily performed in a stable state, and the cost is low. It becomes.

  In said method, it is preferable to form an organic layer in the said fractured surface of the said glass film after a fracture. Here, the “organic layer” includes an organic film (for example, an organic resin film) and the like.

  If it does in this way, since the inclined section which the glass film inclined can be protected by an organic layer, handling of each glass film after cleaving becomes easy.

  In said method, it is preferable to form an organic layer in at least one of the surface or back surface of the said glass film after cleaving. Here, the “organic layer” includes an organic film (for example, an organic resin film) and the like.

  If it does in this way, since the surface or back surface of the glass film after cleaving can be protected by the organic layer, the breakage of the glass film on the track can be reduced. In addition, when the glass film cleaved and separated is wound around the core in a roll shape, the organic layer is interposed between the glass films wound up in a roll shape. Can be prevented. In this case, instead of the organic layer, paper or the like may be separately interposed between the glass films.

  The glass film roll according to the present invention, which was created to solve the above-mentioned problems, is a glass film roll formed by winding a glass film around a core in a roll shape, and the width direction of the glass film The end surface forms a fractured surface that is cleaved by thermal stress generated by local heating and cooling of the heated region, and the fractured surface is inclined with respect to a vertical cross section that passes through an imaginary line extending in a direction perpendicular to the width direction. It is characterized by having an inclined portion.

  According to such a configuration, since the inclined portion is positively formed in the cut surface, if the inclination of the inclined portion is grasped in advance, avoiding interference between the cut surfaces of the adjacent glass films after cleaving, Individual glass films after cleaving can be separated. In other words, if the inclined film is positively provided in this way and the inclination is grasped in advance, the occurrence of defects such as chipping due to interference can be reduced at the time of separation after cleaving. For this reason, it is possible to improve the breaking strength of the fractured surface. In addition, the cracked surface cut by the thermal stress has no microcracks, and has a mirror surface or an end surface having surface properties equivalent thereto. In particular, in the case of a glass film roll, stress accompanying bending is likely to act on the end face in the width direction of the glass film, and thus it can be said that it is very preferable to improve the breaking strength of the fractured surface constituting the end face in the width direction.

  Said structure WHEREIN: While the width direction both end surfaces of the said glass film are comprised by the said fractured surface, the said inclination part of each said fractured surface may incline in the direction which mutually makes a symmetry in the width direction. preferable.

  In this way, since the inclination of the inclined portion formed in the fractured surface of the glass film can be grasped more easily, when the adjacent glass films are separated from each other after cleaving, interference between the fractured surfaces of each other is further increased. It is possible to avoid it reliably. Therefore, it can contribute to the improvement of the breaking strength of the fractured surface of the glass film.

  In the above, the thickness of the glass film is preferably 200 μm or less.

  That is, when the thickness of the glass film is 200 μm or less, the work of winding around the core in a roll shape can be easily performed, and storage and packing can be performed extremely smoothly. In addition, the thickness of a glass film becomes like this. Preferably it is 100 micrometers or less, More preferably, it is 50 micrometers or less.

  Furthermore, the glass film according to the present invention, which was created to solve the above-mentioned problems, is inclined with respect to a vertical section passing through an imaginary line in which the end surface in the width direction of the glass film extends in a direction perpendicular to the width direction. Characterized by having a part.

  According to such a configuration, since the inclined portion is positively formed on the end surface in the width direction of the glass film, by grasping the inclination of the inclined portion in advance, when the end surface in the width direction of the glass film is cleaved Interference between fractured surfaces of adjacent glass films is avoided, and as a result, the occurrence of defects such as chipping due to interference is reduced, resulting in a glass film in which the break strength of the widthwise end surface is improved. . In particular, when handling a glass film, stress due to bending is likely to act on the end face in the width direction of the glass film, so it can be said that such an improvement in the breaking strength of the end face in the width direction is very preferable.

  As described above, according to the present invention, when the glass film is sequentially fed by thermal stress while sequentially feeding the glass film, the fractured section of the glass film is positively inclined in a predetermined direction. Therefore, in consideration of the inclination, it is possible to relatively separate the orbits of the adjacent glass films after cleaving in a predetermined direction, and reduce the friction between the adjacent glass films as much as possible. It becomes possible.

It is a schematic perspective view which shows a part of cleaving apparatus which embodies the cleaving method which concerns on 1st Embodiment of this invention. It is a conceptual diagram for demonstrating the cleaving process performed by the cleaving apparatus which concerns on 1st Embodiment. It is a conceptual diagram for demonstrating the isolation | separation process performed by the cleaving apparatus which concerns on 1st Embodiment. It is a schematic side view which shows the whole structure of the cleaving apparatus which concerns on 1st Embodiment. It is a conceptual diagram for demonstrating the cleaving process performed by the cleaving apparatus which embodies the cleaving method which concerns on 2nd Embodiment of this invention. It is a conceptual diagram for demonstrating the isolation | separation process performed by the cleaving apparatus which concerns on 2nd Embodiment. It is a schematic side view which shows the whole structure of the cleaving apparatus which concerns on 2nd Embodiment. It is a conceptual diagram for demonstrating the cleaving process performed by the cleaving apparatus which embodies the cleaving method which concerns on 3rd Embodiment of this invention. It is a conceptual diagram for demonstrating the isolation | separation process performed by the cleaving apparatus which concerns on 3rd Embodiment. It is a schematic side view which shows the whole structure of the cleaving apparatus which concerns on 3rd Embodiment. It is a schematic side view which shows a part of cleaving apparatus which embodies the cleaving method which concerns on 4th Embodiment of this invention. It is sectional drawing which shows the state which formed the organic layer in the split surface of the glass film cleaved by the cleaving apparatus in the 1st-4th embodiment of this invention. It is sectional drawing which shows the state which formed the organic layer in the back surface of the glass film cleaved by the cleaving apparatus in the 1st-4th embodiment of this invention. It is a conceptual diagram which shows the modification of the method of making the temperature distribution of the thickness direction of a glass film asymmetric with respect to the vertical cross section which passes along a cutting planned line. It is a schematic side view which shows the modification of the method of supplying a glass film continuously. It is a conceptual diagram which shows the state which is evaluating the glass film. It is a figure for demonstrating the conventional problem.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following embodiments, a glass film having a thickness of 200 μm or less used for an FPD, an organic EL lighting device, or a solar cell is targeted. For convenience of explanation, the thickness of the glass film is exaggerated in the accompanying drawings.

  FIG. 1 is a schematic perspective view showing a cleaving apparatus for embodying the glass film cleaving method according to the first embodiment of the present invention. The cleaving apparatus 1 irradiates a laser beam L from the surface side onto a conveying means 2 that conveys the glass film G and the glass film G placed on the conveying means 2 in a horizontal posture (for example, a horizontal posture). A local heating means 3 for performing local heating and a cooling means 4 for injecting the cooling water W from the surface side to the heating region H heated by the local heating means 3 are provided. In this embodiment, a carbon dioxide laser is used as the local heating means 3, but it may be a means capable of performing other local heating such as heating wire or hot air injection. The cooling means 4 injects the cooling water W as a refrigerant by air pressure or the like. This refrigerant is a cooling liquid other than cooling water, a gas such as air or inert gas, or a gas and a liquid. What mixed, Furthermore, what mixed solids, such as dry ice and ice, and the said gas and / or the said liquid, etc. may be sufficient.

  The conveyance means 2 is comprised from a pair of conveyor 5 arrange | positioned mutually spaced apart. The conveyor belts 6 of the pair of conveyors 5 (which may be a plurality of conveyor rollers of a roller conveyor) are driven at the same speed in the direction of arrow a so as to send the glass film G in the direction along the planned cutting line 7. Each of the conveyor belts 6 has a support surface 6a that holds the glass film G by suction or the like, and supports a portion of the glass film G that is separated on both sides from the planned cutting line 7 by the support surface 6a from below. To do. In this state, a space S is formed on the back side of the planned cutting line 7 of the glass film G over the entire length in the longitudinal direction of the conveyor 5. This is to suppress the heat amount generated by the heating by the local heating means 3 or the cooling by the cooling means 4 from being absorbed by the conveyor belt 6 and, of course, omitting the space S to be conveyed. You may make it support the back surface of the glass film G continuously in the width direction with the support surface 6a of the belt 6. FIG.

  According to the above configuration, the conveying belt 6 of the conveyor 5 sends the glass film G, so that the heating area H by the local heating means 3 is prior to the cooling area C by the cooling means 4 and the cutting line 7 of the glass film is cut. The top is scanned from one end side. In this case, since the initial crack 8a (initial crack) is preliminarily formed on the planned cutting line 7 at one end in the longitudinal direction of the glass film G by a crack forming means (not shown), the above-described heating region H and cooling are performed. The initial crack 8a develops due to the thermal stress generated during scanning with the region C. Thereby, the split section 8 which penetrates from the surface to the back surface is formed on the planned cutting line 7, and the glass film G is continuously cut full-body along the planned cutting line 7. In addition, according to the same figure, although the initial crack 8a is formed in the front-end | tip part on the cutting projected line 7 in the surface of the glass film G, this initial crack 8a is from the surface front-end | tip part of the glass film G to an end surface. It may be formed over.

  Furthermore, the split section 8 of the glass film G formed in this manner has a predetermined direction with respect to the vertical section 9 passing through the planned cutting line 7 as shown in FIG. (The left area divided by the boundary). Specifically, the temperature distribution in the thickness direction of the glass film G that is forcibly generated by the heating by the local heating means 3 and the cooling by the cooling means 4 (distribution represented by an isotherm indicated by reference numeral 10 in the drawing) By making the vertical cross section 9 passing through the cutting line 7 positively asymmetrical, the split section 8 is inclined in a predetermined direction with respect to the vertical cross section 9. That is, if the temperature distribution in the thickness direction of the glass film G is positively asymmetric with respect to the vertical section 9 passing through the planned cutting line 7 in this way, the thermal stress generated by this temperature distribution is also relative to the vertical section 9. As a result, the split section 8 is inclined in a predetermined direction as described above.

  Here, the asymmetry of the temperature distribution in the thickness direction of the glass film G is the cooling means in this embodiment in a state where the center position in the width direction of the heating region H by the local heating means 3 is located on the planned cutting line 7. 4 is formed by deviating the center position in the width direction of the cooling region C by the distance D1 from the planned cutting line 7. That is, if only the center position in the width direction of the cooling area C is deviated from the planned cutting line 7 in this way, a deviation occurs between the center position in the width direction of the heating area H and the center position in the width direction of the cooling area C. . Therefore, among the regions divided into two with the vertical cross section 9 passing through the planned cutting line 7 as a boundary, the region on one side where the center position in the width direction of the cooling region C is biased is relative to the region on the other side. The temperature distribution in the thickness direction of the glass film G is asymmetric with respect to the vertical cross section 9 passing through the planned cutting line 7. In this case, the split section 8 of the glass film G has the center in the width direction of the cooling area C of the cooling means 4 among the areas divided into two with the vertical section 9 passing through the planned cutting line 7 as a boundary. It is thought that it inclines toward the area | region on the opposite side of the biased area | region.

  In addition, since the inclination of the fractured face 8 of the glass film G is based on the asymmetry of the temperature distribution in the thickness direction of the glass film G as described above, by adjusting the asymmetry of the temperature distribution, The magnitude of the inclination can be adjusted. Specifically, the size of the deviation distance D1 in the width direction from the cleaving line 7 at the center position in the width direction of the cooling region C of the cooling means 4 and the injection amount of the cooling water W injected from the cooling means 4 are adjusted. . Further, the cooling water W may be changed to another refrigerant such as dry ice.

  Each glass film G cleaved as described above is in a state where the cleaved surfaces 8 interfere with each other in the vertical direction (front and back direction), but each cleaved surface 8 is inclined in a predetermined direction. The direction in which the interference between the two is canceled is also uniquely determined in advance. Therefore, as shown in FIG. 3, after the cleaving, the orbit of one glass film G and the other glass film G according to a predetermined direction in which the interference in the vertical direction between the split sections of the adjacent glass films G is released. If the orbits are relatively separated from each other in the vertical direction, it is possible to reduce the rubbing of the split sections 8 between the adjacent glass films G as much as possible. In the figure, the trajectory of one glass film (right glass film in the figure) G is not changed before and after the separation step, and only the trajectory of the other glass film (left glass film in the figure) G is used. The one glass film G is changed upward relative to the orbit of the glass film G.

  And in this cleaving apparatus 1, as shown in FIG. 4, the glass film G separated into two through the above-mentioned separation process is made of two cores 11a arranged on the downstream side of the conveyor 5. The two glass film rolls 11 which are final products are obtained by winding each around a roll. In this embodiment, the protective sheet 13 drawn out from each protective sheet roll 12 is rolled around the core 11a in a state where the protective sheet 13 is overlaid on the front surface side (or back surface side) of each glass film G. Rolled up.

  Moreover, as shown in the figure, the cleaving apparatus 1 according to the first embodiment is an original glass film obtained by winding the glass film G before cleaving in a roll shape around the core 14 a on the upstream side of the conveyor 5. A roll 14 is further provided, and the glass film G drawn from the original glass film roll 14 is continuously fed in the lateral direction by the conveyor 5. In this embodiment, the protective sheet 13 is preliminarily stacked on the front surface side (or back surface side) of the glass film G included in the original glass film roll 14, and when the glass film G is pulled out from the original glass film roll 14. Then, the protective sheet 13 is peeled off from the front surface (or the back surface) of the glass film G while being wound around the protective sheet roll 15.

  FIG. 5: is a conceptual diagram which shows the cleaving apparatus for embodying the cleaving method of the glass film which concerns on 2nd Embodiment of this invention. The cleaving apparatus 1 according to the second embodiment differs from the cleaving apparatus 1 according to the first embodiment described above in that the glass film G is divided into three or more (5 in the illustrated example) parts in the width direction. In addition, the portions having the planned cutting lines 7 on both sides in the width direction are cleaved so that the split sections 8 formed on both sides in the width direction are inclined in a direction symmetric with each other in the width direction. More specifically, in this embodiment, the glass film G has ear portions Gx that are relatively thicker at the edge portions on both sides in the width direction than the effective glass portion Ga on the center side in the width direction. Yes. Therefore, in the effective glass portion Ga, a part having the planned cutting line 7 is formed on both sides in the width direction, and the part is in a direction in which the split sections 8 formed on both sides in the width direction are symmetric in the width direction as described above. It is cleaved to incline. Thereby, as shown in FIG. 6, the track | orbit of the other glass film G adjacent to the both sides can be made to separate in the same direction with respect to the track | orbit of the glass film G which has the broken cross section 8 on both sides, respectively. In this case, since the orbits of the glass film G after separation appear alternately in the width direction, those that are relatively separated from the front surface side and those that are relatively separated from the back surface side. The trajectory can be changed smoothly.

  And in this cleaving apparatus 1, as shown in FIG. 7, the part corresponding to the edge part containing the ear | edge part Gx among the glass films G isolate | separated into two or more through the above separation processes is perpendicular | vertical downward. The trajectory is changed so as to face, and the lower end is cleaved in the width direction and disposed of, and the portions corresponding to the effective glass portion Ga are respectively wound around a plurality of cores 11a in a roll shape, A plurality of glass film rolls 11 as final products are obtained.

  In this case, the original glass film roll 14 arranged on the upstream side of the conveyor 5 is down-drawed from the molten glass by a down-draw method (overflow down-draw method, slot down-draw method, etc.), or down-drawing to reheat the glass plate. The glass film G drawn from a molding apparatus for forming a glass film by the method (redraw method) is manufactured by winding it around the core 14a in a roll shape without cutting off the ear portion Gx.

  FIG. 8: is a conceptual diagram which shows the cleaving apparatus for embodying the cleaving method of the glass film which concerns on 3rd Embodiment of this invention. The cleaving apparatus 1 according to the third embodiment is different from the cleaving apparatus 1 according to the second embodiment described above in that the glass film G is divided into three or more (three in the illustrated example) parts in the width direction. In this case, all the split sections 8 are inclined in the same direction with respect to the vertical section 9 passing through the planned cutting line 7. In this case, as shown in FIG. 9, all the trajectories of the respective glass films G that are cleaved from the one edge portion of the glass film G to the other edge portion are in the same direction (upper or lower). Can be separated. Moreover, as shown in FIG. 10, the plurality of glass films G separated through the separation process as described above are respectively wound around the core 11a in a roll shape, and a plurality of glass film rolls as final products. 11 is produced.

  FIG. 11: is a schematic side view which shows the cleaving apparatus for embodying the cleaving method of the glass film which concerns on 4th Embodiment of this invention. The cleaving apparatus 1 according to the fourth embodiment is basically different from the cleaving apparatus 1 according to the first to third embodiments described above, basically, the conveyor belt 6 of one conveyor 5 and the other conveyor 5z. Is that the glass film G is supported in a state of being sandwiched by the conveyor belt 6z, and the glass film G is sent downward in a vertical posture as a further difference. Accordingly, both the conveyor belts 6 and 6z are arranged to face each other and are driven at the same speed in the a direction and the b direction, respectively. In addition, the attitude | position of the glass film G on the conveyance belts 6 and 6z is not specifically limited, Even if it is a flat placing attitude | position (horizontal attitude | position), the centerline of the longitudinal direction of the glass film G is horizontal Even if it is inclined, this configuration can be applied.

  FIG. 12 shows an organic layer (preferably an organic resin layer) 16 formed on the section 8 of the glass film G that has been cleaved by the cleaving apparatus 1 in the above embodiment. In the illustrated example, since the glass film G has the split sections 8 at both ends in the width direction, the organic layer 16 is formed at both ends, but when the glass film G has the split sections 8 only at one end in the width direction, The organic layer 16 may be formed only at the one end. In this way, the strength of the fractured surface of the glass film G can be increased, or the strength can be prevented from lowering by preventing and protecting new defects. Therefore, in the glass film G having a thickness of 200 μm or less, sufficient for bending. The strength can be ensured, and the flexibility of the thin glass film G can be effectively utilized. In the case where the organic layer 16 is formed by applying an organic resin to the fractured surface 8, examples of the organic resin include silicone polymer, sol / gel polymer, polycarbonate, polyether sulfone, polyacrylate, polyimide, cycloolefin. Copolymers, polyarylate, silicone resin and the like can be used.

  FIG. 13 shows an organic layer (preferably an organic resin layer) 16 formed on the back surface of the glass film G cleaved by the cleaving device 1 in the above embodiment. Even in this case, the strength of the back surface of the glass film G can be increased or protected to prevent a decrease in strength, thereby ensuring sufficient strength against bending. The flexibility of the film G can be used effectively. In the illustrated example, the organic layer 16 is formed on the back surface of the glass film G, but the organic layer 16 may be formed only on the front surface of the glass film G or on both the front and back surfaces. In the case where an organic film is used as the organic layer 16, for example, polyethylene, polyester, polyamide, polypropylene, and copolymers thereof can be used as the organic film.

  Moreover, when the sharp part which may cause a damage is formed in the split surface 8 of the glass film G, the sharp part of the split surface 8 is melt | dissolved with acids, such as a hydrofluoric acid, or it remelts at high temperature. Thus, the sharpened portion may be rounded. By doing so, it is possible to prevent the fractured surface 8 from being chipped. Therefore, the strength of the fractured surface 8 can be further improved, or the strength can be prevented from decreasing by protecting the fractured surface 8.

  In addition, this invention is not limited to said embodiment, It can implement in a various form. In the above embodiment, in order to incline the split section of the glass film G in a predetermined direction, the center position in the width direction of the heating region H by the local heating means 3 is positioned on the planned cutting line 7, The case where the center position in the width direction of the cooling region C by the cooling means 4 is deviated from the planned cutting line 7 and the temperature distribution of the glass film G is asymmetric with respect to the vertical cross section 9 passing through the planned cutting line 7 has been described. However, it is not limited to this. For example, as shown in FIG. 14, the conveyor belt 6 of the conveyor 5 is made of a thermally conductive member such as metal, and one side of the pair of conveyors 5 that are opposed to each other with the planned cutting line 7 sandwiched from the other side. If it also approaches the parting planned line 7 side, the temperature distribution of the glass film G will become asymmetric with respect to the vertical cross section which passes through the parting planned line 7, and the section 8 will incline in a predetermined direction. That is, the distance in the width direction between the conveyor belt 6 of the conveyor 5 on one side and the planned cutting line 7 is D2, and the distance in the width direction of the conveyor belt 6 on the other conveyor 5 and the planned cutting line 7 is D3. In this case, D2 <D3 (preferably D3 / D2> 2) may be satisfied. If it does in this way, in the part which the conveyance belt 6 comprised with the heat conductive member and the glass film G contact | adhere, the propagation speed of the heat which propagates in the thickness direction of the glass film G becomes quick. Therefore, if the conveyance belt 6 is brought into close contact with the glass film G so as to be asymmetric with respect to the planned cutting line 7 (so that D2 ≠ D3), the two regions divided by the cutting planned line 7 as a boundary. Of these, the heat transfer speed is relatively faster in the region on one side of the region in which the conveying belt 6 is brought close to the planned cutting line 7 relative to the region on the other side. As a result, the temperature distribution in the thickness direction of the glass film G generated by the heating by the local heating means 3 and the cooling by the cooling means 4 is biased toward the region where the heat transfer speed is increased, and the vertical cross section passing through the planned cutting line 9 is asymmetric. In this case, the split section 8 of the glass film G is relatively close to the planned cutting line 7 in the region divided into two with the vertical section 9 passing through the planned cutting line 7 as a boundary. This is considered to be inclined toward the side where the conveyor belt 6 is located.

  Moreover, in said embodiment, although the case where the glass film G was continuously supplied by drawing out the glass film G from the original glass film roll 14 was demonstrated, as shown in FIG. A glass film drawn downward from a molding apparatus 17 for forming a glass film G by a downdraw method (overflow downdraw method, slot downdraw method, etc.) or by a downdraw method (redraw method) for reheating a glass plate. G may be smoothly curved by the conversion roller 18 so as to be sent laterally with respect to the conveyor 5.

  In an example of the present invention, an alkali-free glass film having a long side of 200 m, a short side of 800 mm (the width of the effective glass portion is 750 mm), and an effective glass portion of 100 μm in thickness is 150 mm / second according to the embodiment shown in FIG. The effective glass portion was continuously cleaved into a width of 250 mm and both end edges including the ear portions were cleaved into a width of 25 mm while being fed in the horizontal direction at a feed rate of. Furthermore, after separating the orbits of the cleaved glass film, about the effective glass part having a width of 250 mm, a PET film having a width of 260 mm is stuck on the surface, and then wound around a core having a diameter of 200 mm. Thus, a glass film roll was obtained. On the other hand, both end edges including the ears were changed so that the trajectory was directed vertically downward, and were cleaved in the width direction at the lower end and discarded.

  In such a cleaving, after making an initial crack on the cleaving line of the alkali-free glass film, using a carbon dioxide laser as a local heating means, irradiating on the cleaving line at an output of 20 W, and subsequently cooling As a means, full body cleaving was continuously performed while cooling water was jetted onto the planned cleaving line. During the cleaving, the cooling position by the cooling means and the injection amount of the cooling water were adjusted so that the cleaved surface was inclined in a predetermined direction in the manner shown in FIGS. 5 and 6. And in the separation process after cleaving, the orbit of each glass film was separated in the direction in which the interference accompanying the inclination of the cleaved surface of each glass film was released.

  As a result, in the separation step, each glass film was not damaged, and a visual inspection was performed with a light source of 200,000 lux in a dark room, but no generation of glass powder was observed. Further, 50 glass film samples Sa having a width of 20 mm were collected from the glass film roll obtained here, and as shown in FIG. The strength was evaluated by two-point bending that was sandwiched between and bent so as to be bent in the longitudinal direction at a speed of 50 mm / min. This evaluation was performed by calculating the breaking strength based on the distance between the two plate-like bodies 19 when they were damaged by the push bending. As a result, the fracture strength was good with a minimum value of 230 MPa and an average value of 500 MPa.

DESCRIPTION OF SYMBOLS 1 Cleaving device 2 Conveying means 3 Local heating means 4 Cooling means 5 Conveyor 6 Conveying belt 6a Support surface 7 Split planned line 8 Split section 8a Initial crack 9 Vertical section 11 Glass film roll 14 Original glass film roll 17 Molding apparatus G Glass film H Heating area C Cooling area

Claims (13)

While the glass film is being fed, the glass film is continuously cleaved along the cleaved line by the local heating along the cleaved line extending in the feed direction and the thermal stress generated along with the cooling of the heated region. In the glass film cleaving method of dividing the glass film in the width direction,
The cleaving step of cleaving the glass film continuously so that the cleaved surface is inclined in a predetermined direction with respect to the vertical cross section passing through the cleaved line, and the cleaved surfaces of adjacent glass films after cleaving the so interference caused by the tilt does not occur, the trajectory of the adjacent one of said glass film, and a separation step of relatively separating the front and back direction with respect to the trajectory of the adjacent other of said glass film,
In the cleaving step, the glass film is divided into three or more portions in the width direction, and the portions having the cleaved lines on both sides in the width direction are opposite to each other in the cut sections formed on both sides in the width direction. A method for cleaving a glass film, which is cleaved so as to incline in a direction . While the glass film is being fed, the glass film is continuously cleaved along the cleaved line by the local heating along the cleaved line extending in the feed direction and the thermal stress generated along with the cooling of the heated region. In the glass film cleaving method of dividing the glass film in the width direction,
The cleaving step of cleaving the glass film continuously so that the cleaved surface is inclined in a predetermined direction with respect to the vertical cross section passing through the cleaved line, and the cleaved surfaces of adjacent glass films after cleaving A separation step of relatively separating the orbits of the one adjacent glass film relative to the orbits of the other adjacent glass film so as not to cause interference due to the inclination of
In the cleaving step, the glass film is divided into three or more portions in the width direction, and the portions having the cleaved lines on both sides in the width direction have the same cut section formed on both sides in the width direction. A method for cleaving a glass film, which is cleaved so as to incline in a direction. In the cleaving step, when the thermal stress is generated, the temperature distribution in the thickness direction of the glass film is asymmetric with respect to a vertical cross section passing through the planned cutting line, thereby inclining the cleaved section. The method for cleaving a glass film according to claim 1 or 2 . The temperature distribution of the glass film is asymmetric with respect to a vertical cross-section passing through the planned cutting line by abutting a thermally conductive member asymmetrically with respect to the planned cutting line on the glass film. 3. A method for cleaving a glass film according to 3 . In the state where the center position in the width direction of the heating region by the local heating is aligned with the planned cutting line, the center position in the width direction of the cooling region by the cooling is deviated from the planned cutting line, whereby the temperature distribution is The method for cleaving a glass film according to claim 3 , wherein the glass film is asymmetric with respect to a vertical cross section passing through the planned cleaving line.   The glass film cleaving method according to any one of claims 1 to 5, wherein each of the glass films separated in the separation step is wound up in a roll shape around a core.   While producing the original glass film roll which winds up the glass film before cleaving in roll shape around a core, in the cleaving process, supplying the glass film pulled out from the original glass film roll The cleaving method for a glass film according to any one of claims 1 to 6. The glass film cleaving method according to any one of claims 1 to 6, wherein the glass film is supplied to the cleaving step while being continuously formed by a downdraw method. The said local heating is performed with a laser, The cleaving method of the glass film of any one of Claims 1-8 characterized by the above-mentioned. The method for cleaving a glass film according to any one of claims 1 to 9 , wherein an organic layer is formed on the cleaved surface of the glass film after cleaving. The method for cleaving a glass film according to any one of claims 1 to 10 , wherein an organic layer is formed on at least one of the front surface or the back surface of the glass film after cleaving. Cleaving method for a glass film according to any one of claims 1 to 11, wherein the thickness of said glass film is 200μm or less. The manufacturing method of the glass film characterized by implementing the method of any one of Claims 1-12.

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