JP2017214263A - Method for manufacturing glass film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a manufacturing cost and improve quality, when a glass film is manufactured by a manufacturing method including the step of cutting a belt-like glass film in the width direction while flat conveying the belt-like glass film in the longitudinal direction.SOLUTION: A method for manufacturing a glass film performs the cutting start point forming step P4 of forming a cutting start point 4 on the side of the upper surface 3a in the width direction in the first section S1 of a conveying path; and a fracturing and cutting step P5 of curving a forming portion 3f of the cutting start point 4 in the second section S2 of the conveying path so that the side of the upper surface 3a is convex and fracturing and cutting a belt-like glass film 3, when cutting the belt-like glass film 3 in the width direction while flat conveying the belt-like glass film in the longitudinal direction. A direction changing portion 25 for changing direction of the conveying path in the middle is provided in the second section S2, and the forming portion 3f of the cutting start point 4 is curved when the forming part 3f of the cutting start point 4 passes the direction changing portion 25.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for producing a glass film including a step of cutting the band-shaped glass film in the width direction while transporting the band-shaped glass film in the longitudinal direction in a flat position.

  In recent years, mobile terminals such as smartphones and tablet PCs that are rapidly spreading are required to be thin and lightweight, and thus there is an increasing demand for thinning glass substrates incorporated in these terminals. Is the current situation. Under such circumstances, glass films, which are glass substrates that have been thinned to a film shape (for example, a thickness of 300 μm or less), have been developed and manufactured.

  The manufacturing process of a glass film may include a step of winding a strip-shaped glass film as a base of the glass film to produce a glass roll, and a step of continuously cutting the glass film from the strip-shaped glass film. In these steps, it is necessary to cut the strip glass film in the width direction. As an example of the technique used for such cutting, the technique disclosed in Patent Document 1 can be mentioned.

  This method is a method of cutting the strip glass film in the width direction so as to form a rear side end (portion wound last) of the strip glass film to be wound up when producing the glass roll. In this method, after forming a scribe line as a starting point of cutting on the upper surface side along the width direction for the strip-shaped glass film conveyed in the longitudinal direction in a flat position, the scribe line forming portion is convex on the upper surface side. It is made to curve so that the band-shaped glass film is broken and cut.

  In this method, the following mechanism is employed to bend the scribe line forming portion. This mechanism includes a pair of pre-cutting rollers and a pair of post-cutting rollers that sandwich the glass strip from both the front and back sides on the upstream side and the downstream side of the transport path of the belt-shaped glass film. Moreover, the cutting roller which can lift the site | part of the strip | belt-shaped glass film which passes the said location from the downward direction is provided in the location located between both roller pairs among conveyance paths.

  When performing the cutting of the strip-shaped glass film by the same mechanism, the rotational peripheral speed of the downstream post-cutting roller pair is decelerated from the rotational peripheral speed of the upstream pre-cutting roller pair so that both roller pairs Deflection is caused in the portion of the band-shaped glass film passing between each other. And the cutting roller lifts the bent part, and the part which passes on the cutting roller is curved so that the upper surface side becomes convex. Thereby, if the formation part of a scribe line passes between both roller pairs with conveyance of a strip | belt-shaped glass film, the said formation part will curve the upper surface side convexly on a cutting roller, and a strip | belt-shaped glass film will be folded.

  In addition, the technique disclosed in Patent Document 1 is not only for producing a glass roll as described above by repeatedly executing the formation of the scribe line for the belt-shaped glass film and the folding of the belt-shaped glass film, The present invention can also be used when a glass film is continuously cut out from a band-shaped glass film.

JP 2010-132347 A

  However, when the method disclosed in Patent Document 1 is used when cutting the band-shaped glass film in the width direction, the following problems to be solved have occurred.

  That is, in this method, every time the strip glass film is cut, the rotational peripheral speed of the roller pair after cutting is reduced, and the portion of the strip glass film passing between the two roller pairs is lifted by the cutting roller. It is essential. Therefore, a control mechanism for controlling these operations is naturally necessary, and the equipment cost and the operation cost of the equipment are unduly increased, resulting in a problem that the manufacturing cost of the glass film is increased. In addition, in this method, it is necessary to sandwich the glass ribbon film from both the front and back sides by both roller pairs, and this causes scratches on the front and back surfaces, and the quality of the glass film produced from this glass ribbon film is low. There was also a problem that would decrease.

  This invention made | formed in view of said situation, when manufacturing a glass film with the manufacturing method including the process of cut | disconnecting the said strip | belt-shaped glass film to the width direction, conveying a strip | belt-shaped glass film to a longitudinal direction with a flat placing attitude | position. The technical problem is to reduce the manufacturing cost and improve the quality.

  The present invention, which was created to solve the above-mentioned problems, is the first of the transport path when cutting the strip-shaped glass film in the width direction while transporting the strip-shaped glass film in the longitudinal direction along the transport path. In the section, the cutting start point forming step for forming the cutting start point on one surface side along the width direction of the belt-like glass film, and in the second section of the conveyance path, the cutting start point forming portion is curved so that the one surface side is convex. A glass film manufacturing method for performing a split cutting step of splitting and cutting the belt-shaped glass film, wherein the second section is provided with a direction changing portion that changes the direction of the conveyance path, and is cut. As the starting point forming portion passes through the direction change portion, the cutting starting point forming portion is characterized by being curved.

  In this method, in the direction change part provided in the 2nd area, the conveyance path | route of a strip glass film is changed in the middle. Thereby, after the formation portion of the cutting start point that has been formed in the first section and has moved to the second section passes through the direction changing portion, the one side of the forming portion follows the direction change of the conveyance path. Curve to be convex. Then, a bending stress acts on the forming portion due to the bending of the forming portion of the cutting start point, and the belt-like glass film is broken and cut in the width direction starting from the cutting start point. Thus, in this method, since the conveyance path itself has a function of bending the cutting start point forming portion, a mechanism for bending the forming portion and a control for controlling the operation of the mechanism are included. There is no need to provide a separate mechanism. As a result, when manufacturing the glass film, it is possible to avoid unreasonably increasing the equipment cost and the operation cost of the equipment, so that the manufacturing cost of the glass film can be reduced. Moreover, in this method, a strip | belt-shaped glass film is conveyed flatly along a conveyance path | route including a direction change part. Thereby, it can cut | disconnect in the width direction, conveying the said strip-shaped glass film, without substantially contacting with respect to the upper surface of a strip-shaped glass film. As a result, the occurrence of scratches on the upper surface is suppressed as much as possible, and the quality of the glass film produced from the strip glass film can be improved.

  In the above method, the cutting starting point is formed on the upper surface side of the belt-shaped glass film, and the cutting starting point forming part is curved so that the upper surface side is convex as the cutting starting point forming part passes through the direction changing part. It is preferable to make it.

  Since the belt-shaped glass film is transported flat, a force in the direction from the upper surface side to the lower surface side acts on the belt-shaped glass film due to its own weight. From this, when the cutting start point is formed on the upper surface side, and the upper surface side is curved so as to be convex as the cutting start point forming portion is passed through the direction changing portion, the following effects are obtained. Is obtained. That is, in this case, when the forming portion of the cutting start point is curved so that the upper surface side is convex, the portion of the band-shaped glass film continuous to the upstream side of the forming portion and the band-shaped glass film continuous to the downstream side Both parts tend to bend downward due to their own weight. As a result, the formation portion of the cutting start point can be smoothly bent and the bending stress can be suitably applied, which is advantageous in avoiding the occurrence of cutting failure in the band-shaped glass film.

  In the above method, the direction changing unit is a connection part between both the up-gradient path having the up-gradient path as the transport path and the down-gradient path having the down-gradient path as the downstream path of the up-gradient path. It is preferable that

  If it does in this way, the formation part of the cutting origin which has moved to the direction change part will approach the down slope course immediately after passing the up slope path. For this reason, it is easy to increase the curvature of the curvature when the cutting start point forming portion is curved so that the upper surface side is convex as the direction changing portion passes. Therefore, it becomes easy to make the bending stress of a magnitude | size large enough for a crack to act on the formation part of a cutting start point, and generation | occurrence | production of the cutting defect in a strip | belt-shaped glass film can be avoided more reliably.

  In the above method, it is preferable to keep the cutting start point forming portion flat in a section located between the first section and the second section in the transport path.

  In this way, after the cutting start point is formed in the first section, before the cutting start point forming part enters the direction changing part in the second section, bending stress due to bending is applied to the forming part unreasonably. It is possible to prevent the occurrence of such a situation. Thereby, it can avoid that a strip | belt-shaped glass film will be cut | disconnected in the position which is not intended on a conveyance path | route.

  In said method, you may cut out a glass film continuously from a strip | belt-shaped glass film by repeatedly performing a cutting | disconnection start point formation process and a split cutting process.

  In the method for producing a glass film according to the present invention, as described above, the conveyance path itself has a function of bending the forming portion of the cutting start point, and controls the mechanism for bending the forming portion and the operation of the mechanism. There is no need to provide a separate control mechanism. For this reason, even if it is a case where a glass film is continuously cut out from a strip-shaped glass film, it becomes possible to manufacture many glass films at low cost.

  In said method, the 1st conveying apparatus which conveys a glass film and the 2nd conveying apparatus which transfers the glass film carried out from the 1st conveying apparatus are provided, and it compares with the feeding speed of the glass film by a 1st conveying apparatus. Thus, it is preferable to increase the feeding speed of the glass film by the second transport device.

  If it does in this way, the conveyance direction back of the glass film located in the downstream of a conveyance path | route about two glass films adjacent on the conveyance path | route of a glass film among the glass films cut out continuously from a strip | belt-shaped glass film. It becomes easy to avoid that the edge part of a side and the edge part of the conveyance direction front side of the glass film located in an upstream contact unjustly. This is because the glass film feeding speed of the second transport device is higher than that of the first transport device, so that the glass film located on the downstream side is transferred from the first transport device to the second transport device. Moreover, it is because the space | interval with the glass film located in an upstream can be expanded. And as mentioned above, since it becomes easy to avoid the undue contact between the end portions, it is difficult to cause defects such as scratches on the glass film due to the contact, and the deterioration of the quality of the glass film is prevented. It becomes easy to do.

  In the above method, each glass film cut from the belt-shaped glass film with the transport surface of the second transport device positioned below the transport surface of the first transport device and facing the transport surface of the second transport device The glass sheet transferred from the first transport device to the second transport device can be transferred by dropping the glass film unloaded from the first transport device onto the protective sheet being transported by the second transport device. preferable.

  In order to prevent the occurrence of scratches on the front and back surfaces, the glass film is usually handled in a state of being overlaid with a protective sheet. Therefore, if the glass film carried out from the first conveying device is dropped onto the protective sheet being conveyed by the second conveying device as in this method, the glass film is superposed on the protective sheet accordingly. It becomes possible to protect the glass film from the occurrence of scratches. Furthermore, according to this method, it can superimpose with a protective sheet, conveying a glass film toward a downstream process. Therefore, it is not necessary to separately provide a process for superimposing the glass film and the protective sheet, and the glass film production efficiency can be improved.

  In the above method, when a glass roll is produced by winding the belt-shaped glass film into a roll, the rear side end of the belt-shaped glass film to be wound is formed by performing a cutting start point forming step and a split cutting step. Also good.

  In the manufacturing method of the glass film which concerns on this invention, if the cutting start point is formed in a strip | belt-shaped glass film in the 1st area of a conveyance path | route, after that, a conveyance path | route itself will break and cut | disconnect a strip | belt-shaped glass film. For this reason, when a strip glass film of a desired length is wound up as a glass roll, if the cutting start point is formed in the belt glass film, the rear side end of the belt glass film to be wound can be formed, and the glass roll is completed. It becomes possible to make it.

  In said method, it is preferable to form a cutting | disconnection starting point only in one edge part among the width direction both ends of a strip | belt-shaped glass film.

  For example, when cutting starting points are formed at both ends in the width direction of the band-shaped glass film, a cutting portion that extends from the cutting starting point formed at one end portion toward the other end portion and the other end portion are formed. In some cases, the cut portion that progresses toward the one end portion from the cut starting point does not merge well at the center in the width direction, and both cut portions are formed in a state of being shifted in the longitudinal direction of the band-shaped glass film. As a result, there is a possibility that the shape of the cut end portion (end portion formed by the progress of both cut portions) of the belt-shaped glass film is deteriorated. However, if the cutting start point is formed only at one end portion of the both ends in the width direction, the above-described fear can be accurately eliminated. Moreover, in the site | part which formed the cutting | disconnection start point, it becomes easy to produce a crack inevitably rather than the non-formation site | part. For this reason, if the cutting start point is formed not at the widthwise center but at the widthwise end, cracks hardly remain at the center, which is advantageous in improving the quality of the glass film.

  According to this invention, when manufacturing a glass film with the manufacturing method including the process of cut | disconnecting the said strip | belt-shaped glass film to the width direction, conveying a strip | belt-shaped glass film to a longitudinal direction by a flat placing attitude, the manufacturing cost is reduced. It can be reduced.

It is a fragmentary sectional side view which shows the manufacturing method of the glass film which concerns on 1st embodiment of this invention. It is a side view which shows the manufacturing method of the glass film which concerns on 1st embodiment of this invention. It is a top view which shows the manufacturing method of the glass film which concerns on 1st embodiment of this invention. It is a vertical front view which shows the manufacturing method of the glass film which concerns on 1st embodiment of this invention. It is a side view which shows the manufacturing method of the glass film which concerns on 1st embodiment of this invention. It is a side view which shows the manufacturing method of the glass film which concerns on 1st embodiment of this invention. It is a side view which shows the manufacturing method of the glass film which concerns on 1st embodiment of this invention. It is a side view which shows the manufacturing method of the glass film which concerns on 1st embodiment of this invention. It is a side view which shows the manufacturing method of the glass film which concerns on 2nd embodiment of this invention. It is a side view which shows the manufacturing method of the glass film which concerns on 3rd embodiment of this invention. It is a side view which shows the manufacturing method of the glass film which concerns on 4th embodiment of this invention.

  Hereinafter, the manufacturing method of the glass film which concerns on embodiment of this invention is demonstrated with reference to attached drawing.

<First embodiment>
Hereinafter, the manufacturing method of the glass film which concerns on 1st embodiment is demonstrated.

  The manufacturing method of the glass film which concerns on 1st embodiment is divided | segmented and shown in two drawings of FIG. 1 and FIG. 1 and 2 show only a part of the steps in the method. An arrow II shown in FIG. 1 indicates that the steps downstream of the arrow II are shown in FIG. 2, and the illustration in FIG. 1 is omitted. The arrow I shown in FIG. This process is shown in FIG. 1, and the illustration in FIG. 2 is omitted.

  As shown in FIG. 1, the manufacturing method of the glass film which concerns on 1st embodiment is a strip | belt shape conveyed by the shaping | molding process P1 which shape | molds the strip | belt-shaped glass film 2 from the molten glass 1 by the overflow downdraw method, and the downward direction after shaping | molding. Cutting direction removal process P2 which changes conveyance direction of glass film 2 to horizontal direction, and cutting and removing non-effective part 2a which is an unnecessary part from laser beam cutting method from strip-like glass film 2 which changed the conveyance direction P3 is included.

  Furthermore, as shown in FIG. 2, the glass film manufacturing method according to the first embodiment is the first in the transport path while transporting the strip-shaped glass film 3 from which the ineffective portion 2 a has been removed in the longitudinal direction. In the section S1, the cutting start point forming step P4 for forming the cutting start point 4 (see FIG. 5) on the upper surface 3a side in the width direction, and in the second section S2 of the transport path, the forming portion 3f (see FIG. 5) is bent so that the upper surface 3a side is convex, and the split cutting step P5 for breaking and cutting the strip glass film 3, and the glass film 5 cut out from the strip glass film 3 along with the split, A laminating step P6 for laminating the protective sheet 6aa unwound from the sheet roll 6 is included.

  As shown in FIG. 1, a molded body 7 formed in a wedge shape is used for executing the molding process P1. The molded body 7 has an overflow groove 7a formed at the top part into which the molten glass 1 flows, a pair of side surface parts 7b and 7b for flowing down the molten glass 1 overflowing from the overflow groove 7a on both sides, And a lower end portion 7c for fusing and integrating the molten glass 1 flowing down along each of the side surface portions 7b, 7b. The molded body 7 can mold the glass ribbon 8 from the molten glass 1 fused and integrated at the lower end portion 7 c of the molded body 7. The formed glass ribbon 8 is cooled slowly while pulling downward in a state of being sandwiched from both sides of the front and back by a pair of rollers (not shown) arranged in a plurality of stages on the upper and lower sides, and then the temperature is lowered to around room temperature to reduce the temperature to near the room temperature. To do.

  The band-shaped glass film 2 is formed to a thickness that can impart flexibility, for example, to a thickness of 300 μm or less. The band-shaped glass film 2 includes an effective portion 2b that is located in the center in the width direction and later becomes a product, and a pair of non-effective portions 2a that are located outside the effective portion 2b in the width direction and are later removed. , 2a. Each of the ineffective portions 2a and 2a includes an ear portion having a thickness larger than that of other portions.

  For the execution of the transport direction changing step P2, a roller group 9 including a plurality of rollers 9a arranged along an arcuate track is used. The roller group 9 passes the band-shaped glass film 2 while curving it along the arcuate path while supporting the band-shaped glass film 2 from one side. Thereby, the conveyance direction of the band-shaped glass film 2 carried into the roller group 9 is changed while being conveyed vertically downward, and the band-shaped glass film 2 is unloaded while being conveyed in the horizontal direction.

  The belt-shaped glass film 2 whose transport direction has been changed is transferred from the roller group 9 to the belt conveyor 10. On the belt conveyor 10, a gas (for example, air) (not shown) is sprayed from below toward the effective portion 2b of the band-shaped glass film 2, and the band-shaped glass film 2 is placed in a state where the effective portion 2b is levitated. Transport to the downstream side of the transport path. The belt-shaped glass film 2 carried out from the belt conveyor 10 is transferred to the belt conveyor 11. Below the belt conveyor 11, a sheet roll 12 formed by winding a belt-shaped protective sheet 12 a in a roll shape is disposed. The belt-shaped protective sheet 12 a is sequentially unwound from the sheet roll 12 and continuously supplied to the transport surface 11 a of the belt conveyor 11. This conveyance surface 11a can adsorb | suck the strip | belt-shaped protection sheet 12a. A suction hole (not shown) is formed in the transport surface 11a, and a negative pressure is generated and adsorbed to the belt-like protective sheet 12a through the suction hole. Then, the transport surface 11 a sends the adsorbed belt-like protective sheet 12 a to the downstream side of the transport path of the belt-like glass film 2 as the belt conveyor 11 rotates. Thereby, the belt-shaped glass film 2 transferred to the belt conveyor 11 is transported to the downstream side of the transport path while being supported by the transport surface 11a via the belt-shaped protective sheet 12a.

  The cutting and removing step P3 is performed on the belt-shaped glass film 2 conveyed on the belt conveyor 11. For execution of the cutting and removing step P3, a laser cutting machine 13 capable of executing the laser cleaving method is used. The laser cutting machine 13 is installed in a state of being fixed at a fixed point above the conveyance path, and irradiates the belt 14 with the laser 14 and the coolant 15 (for example, mist-like water or the like). ) Is possible. Thereby, as shown in FIG. 3, the laser cutting machine 13 is the local heating part heated with the laser 14 along the cutting projected line 16 used as the boundary of the effective part 2b of the strip | belt-shaped glass film 2, and the non-effective part 2a. 14a and the local cooling part 15a cooled with the refrigerant 15 are formed adjacent to each other. By the thermal stress generated due to the temperature difference between the two portions 14a and 15a, the strip glass film 2 is continuously cut along the longitudinal direction, and the ineffective portion 2a is gradually removed from the strip glass film 2. Go. After execution of the cutting and removing step P3, a band-shaped glass film 3 including only the effective portion 2b is obtained. Both ends 3b, 3b in the width direction of the band-shaped glass film 3 are cleaved ends formed by a laser cleaving method. Here, in the present embodiment, the cutting / removing process P3 is performed using the laser cutting method. However, the cutting / removing process P3 may be performed using the laser fusing method.

  As shown in FIG. 1, the ineffective portion 2 a removed from the belt-shaped glass film 2 is transferred from the belt conveyor 11 to the belt conveyor 17 and is separated downward from the transport path of the belt-shaped glass film 3 (effective portion 2 b). Discard. On the other hand, after the belt-shaped glass film 3 is transferred from the belt conveyor 11 to the plate-like body 18, it is further transferred from the plate-like body 18 to the belt conveyor 19 and conveyed downstream of the conveyance path. Here, similarly to the supply of the belt-shaped protective sheet 12a to the transport surface 11a of the belt conveyor 11, the belt-shaped protective sheet 20a unrolled from the sheet roll 20 is continuously applied to the transport surface 18a of the plate-like body 18. Supply. The belt-shaped protective sheet 20a that has passed through the conveyance surface 18a of the plate-like body 18 is transferred from the plate-like body 18 to the belt conveyor 19 and continuously supplied to the conveyance surface 19a of the belt conveyor 19. Thereby, on the plate-shaped body 18 and the belt conveyor 19, it conveys to the downstream of a conveyance path | route in the state which supported the strip | belt-shaped glass film 3 by the conveyance surface 18a and the conveyance surface 19a via the strip | belt-shaped protection sheet 20a, respectively. In addition, the conveyance surface 19a of the belt conveyor 19 can adsorb | suck the strip | belt-shaped protection sheet 20a with the mechanism similar to the conveyance surface 11a of the belt conveyor 11. FIG.

  As shown in FIG. 2, the belt-shaped glass film 3 carried out from the belt conveyor 19 is transferred to the plate-like body 21 in which the transport surface 21a is inclined with respect to the horizontal plane. The conveyance surface 21a is an inclined plane that gradually rises toward the downstream side of the conveyance path, and the conveyance path of the band-shaped glass film 3 on the plate-like body 21 becomes an upward gradient path by the conveyance surface 21a. ing. The belt-like protective sheet 20a that has passed through the conveyance surface 19a of the belt conveyor 19 is continuously supplied to the conveyance surface 21a of the plate-like body 21. The belt-like protective sheet 20 a is transferred from the belt conveyor 19 to the plate-like body 21 via a tensioner roller 22 disposed between the belt conveyor 19 and the plate-like body 21. Thereby, on the plate-shaped body 21, it conveys to the downstream of a conveyance path | route (uphill gradient path | route) in the state which supported the strip | belt-shaped glass film 3 with the conveyance surface 21a via the strip | belt-shaped protection sheet 20a.

As shown in FIGS. 4 and 5, the cutting start point forming step P <b> 4 is performed on the band-shaped glass film 3 conveyed on the plate-like body 21. In the execution of the cutting start point forming step P4, a grindstone 23 (for example, a diamond grindstone or the like) is used as a scratching means for scratching the belt-shaped glass film 3 to form the cutting start point 4. The grindstone 23 can be moved along the trajectory 23a during operation, and can be kept on standby above the conveyance path when not in operation. The grindstone 23 moves in the width direction on the upper surface 3a of the band-shaped glass film 3 along the locus 23a, so that the cutting start point 4 is provided only at one end 3b among the width direction both ends 3b, 3b of the band-shaped glass film 3. Form. In addition, the grindstone 23 is moved on the upper surface 3a of the strip-shaped glass film 3 in a non-rotating state. Here, in this embodiment, although the scratch formed in the strip-shaped glass film 3 using the grindstone 23 is set as the cutting starting point 4, a scribe line formed in the width direction of the strip-shaped glass film 3 using a scribe wheel is also used. The cutting start point 4 may be used. Alternatively, a scribe line formed in the width direction of the strip glass film 3 using a laser such as a CO ₂ laser may be used as the cutting start point 4.

  As shown in FIG. 2, the belt-like protective sheet 20 a that has passed through the conveyance surface 21 a of the plate-like body 21 is wound around a roller 24 that is arranged on the downstream side of the conveyance path with respect to the plate-like body 21. Of the belt-shaped protective sheet 20a, a portion 20aa spanned between the plate-like body 21 and the roller 24 (hereinafter referred to as a bridging portion 20aa) gradually moves downward toward the downstream side of the transport path. So as to be inclined. This bridging portion 20aa functions as a first carrying device for carrying the glass film 5 cut out from the band-shaped glass film 3, and the carrying route by the bridging portion 20aa is a downward gradient route due to the inclination of the bridging portion 20aa. It has become. This downward gradient path is connected to the downstream side of the above-described upward gradient path, and the connecting portion of both the upward gradient path and the downward gradient path is a direction changing portion 25 that changes the direction of the transport route. . In addition, the direction change part 25 is located in 2nd area S2 of a conveyance path | route.

  As shown in FIG. 6 and FIG. 7, the split cutting step P5 causes the forming portion 3f to bend as the forming portion 3f of the cutting start point 4 in the belt-shaped glass film 3 passes through the direction changing portion 25. Run with. In the split cutting step P5, the formation part 3f of the cutting start point 4 is bent by utilizing the weight of the strip glass film 3 passing through the direction changing part 25. Thereby, the bending stress generated with the curvature is applied to the forming portion 3f, and the cutting glass 4 is cut in the width direction by extending the cutting portion in the width direction starting from the cutting start point 4. Along with this, the glass film 5 is cut out from the band-shaped glass film 3. Note that the split cutting process P5 and the above-described cutting start point forming process P4 are repeatedly executed a plurality of times. Thereby, a plurality of glass films 5 are continuously cut out from the band-shaped glass film 3.

  As shown in FIG. 7 and FIG. 8, in the laminating process P6, when the glass film 5 carried out from the bridging portion 20aa is transferred to the belt conveyor 26 as the second conveying device, the glass film 5 is transferred by the belt conveyor 26. It is executed by dropping it on the protective sheet 6aa being conveyed. In addition, the lamination process P6 is performed with respect to each piece of the glass film 5 cut out from the belt-like glass film 3. The protective sheet 6aa has a size that is slightly larger than the glass film 5, and can cover the entire lower surface 5b of the glass film 5. The conveyor surface 26a of the belt conveyor 26 is located below the bridging portion 20aa (the conveying surface in the bridging portion 20aa) and is a sloped surface that gradually rises toward the downstream side of the conveying path. The feeding speed V1 of the glass film 5 (the protective sheet 6aa and the laminated glass film 5) by the belt conveyor 26 is higher than the feeding speed V2 of the glass film 5 by the bridging portion 20aa. Here, the feed speed V1 is preferably set to a speed that is increased by 2% to 20% based on the feed speed V2. The supply of the protective sheet 6aa to the conveying surface 26a of the belt conveyor 26 is performed from the sheet roll 6 disposed below the plate-like body 21. Specifically, the belt-shaped protective sheet 6a unrolled from the sheet roll 6 is sandwiched between a pair of rollers 27, 27 from both the front and back sides, and the belt-shaped protective sheet 6a is moved along the belt conveyor as the rollers 27, 27 rotate. 26 is sent toward the transport surface 26a. And when the length of the sent-out part becomes a desired length, the belt-shaped protective sheet 6a is cut in the width direction by a cutting machine 28 (for example, a cutter) to cut out the protective sheet 6aa.

  Here, the cutting start point formation process P4, the split cutting process P5, and the lamination process P6 described above are executed in conjunction with each other. The interlocking of these steps will be described with reference to FIGS.

  As shown in FIG. 5, first, the cutting start point 4 is formed on the band-shaped glass film 3 with the grindstone 23 by executing the cutting start point forming step P4. At this time, in order to prepare for the stacking process P6 to be executed later, the pair of rollers 27, 27 has already started to feed the belt-shaped protective sheet 6a toward the transport surface 26a of the belt conveyor 26. As shown in FIG. 6, after the cutting start point 4 is formed, the formation part 3 f of the cutting start point 4 is kept flat on the plate-like body 21, and between the first section S <b> 1 and the second section S <b> 2. The section where it is located is moved to approach the direction changing unit 25. When the formation part 3f of the cutting start point 4 reaches the direction changing part 25, as shown in FIG. 7, the strip-like glass film 3 is folded and the split cutting step P5 is executed. cut. Then, the strip | belt-shaped protection sheet 6a sent to the pair of rollers 27 and 27 previously is cut | disconnected, and as shown in FIG. 8, the lamination process P6 is performed so that the cut-out protection sheet 6aa and the glass film 5 may be piled up.

  As shown in FIG. 2, the glass film 5 laminated with the protective sheet 6aa is transferred from the belt conveyor 26 to the belt conveyor 29, and further conveyed to the downstream side of the conveyance path. Finally, the protective sheet 6aa And glass film 5 are alternately stacked and stored. In addition, the height position of the conveyance surface 29a of the belt conveyor 29 is the same height position as the conveyance surface 19a of the belt conveyor 19 mentioned above. That is, the height position at which the belt-shaped glass film 3 is transported before the cutting start point forming step P4 and the height position at which the glass film 5 is transported after the lamination step P6 are prevented from being displaced. Thus, the glass film manufacturing method according to the first embodiment is completed.

  Hereinafter, main actions and effects of the glass film manufacturing method according to the first embodiment will be described.

  In the manufacturing method of the glass film which concerns on 1st embodiment, when the formation part 3f of the cutting | disconnection start point 4 passes the direction change part 25, the said formation part 3f is convex on the upper surface 3a side according to the direction change of a conveyance path | route. To bend. Thereby, the strip glass film 3 is broken and cut | disconnected in the width direction. Thus, since the conveyance path itself has a function of bending the forming portion 3f of the cutting start point 4, a mechanism for bending the forming portion 3f and a control mechanism for controlling the operation of the mechanism. Need not be provided separately. As a result, when manufacturing the glass film 5, since it can avoid unreasonably increasing an installation cost and an operation cost of an installation, the manufacturing cost of the glass film 5 can be reduced. Moreover, in the same method, except when the cutting start point 4 is formed, it is possible to avoid contact with the upper surface 3a of the band-shaped glass film 3 that is conveyed in a flat position. As a result, generation | occurrence | production of the damage | wound in the upper surface 3a is suppressed as much as possible, and it becomes possible to improve the quality of the glass film 5 manufactured from the strip | belt-shaped glass film 3. FIG.

  Hereinafter, the manufacturing method of the glass film which concerns on other embodiment of this invention is demonstrated. In addition, in description of other embodiment, about the element already demonstrated by said 1st embodiment, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol to drawing referred in description of other embodiment, Only differences from the first embodiment will be described.

<Second embodiment>
As shown in FIG. 9, the point which the manufacturing method of the glass film which concerns on 2nd embodiment of this invention differs from said 1st embodiment is a point from which the structure of the direction change part 25 differs. . In the present embodiment, the bridging portion 20aa extends in parallel to the horizontal plane, and the conveyance path by the bridging portion 20aa is a horizontal path that is continuous to the downstream side of the upward gradient path. Thereby, in this embodiment, the direction change part 25 is a connection part of an up-gradient path | route and a horizontal path | route.

<Third embodiment>
As shown in FIG. 10, the glass film manufacturing method according to the third embodiment of the present invention is different from the first embodiment in that the configuration of the direction changing portion 25 is different. . In this embodiment, the conveyance surface 21a of the plate-shaped body 21 is a horizontal plane, and the conveyance path of the strip-shaped glass film 3 on the plate-shaped body 21 is a horizontal path that is continuous with the upstream side of the downward gradient path. . Thereby, in this embodiment, the direction change part 25 is a connection part of a horizontal path | route and a downward gradient path | route.
<Fourth embodiment>
As shown in FIG. 11, the manufacturing method of the glass film according to the fourth embodiment of the present invention is different from the first embodiment in that the belt-shaped glass film 3 and the belt-shaped protective sheet 6a are overlapped. In this state, when these are wound up in a roll shape to produce the glass roll 30, the cutting start point forming step P4 and the split cutting step P5 are performed. In the present embodiment, the cutting start point forming step P4 and the split cutting step P5 are each performed only once to form the rear side end portion 3c of the band-shaped glass film 3 wound up in a roll shape. Moreover, in the lamination | stacking process P6, while the strip | belt-shaped glass film 3 wound up in roll shape is continuously overlap | superposed with the strip | belt-shaped protective sheet 6a which was sequentially unwound from the sheet | seat roll 6, the back side end of the strip-shaped protective sheet 6a In order to form the part 6ab, the band-shaped protective sheet 6a is cut in the width direction only once.

  Also in the glass film manufacturing method according to the second to fourth embodiments, it is possible to obtain the operations and effects described above in the description of the glass film manufacturing method according to the first embodiment.

  Here, the manufacturing method of the glass film which concerns on this invention is not limited to the aspect demonstrated by said each embodiment. For example, in each of the above embodiments, the band-shaped glass film is formed by the overflow down-draw method, but the band-shaped glass film may be formed by a slot-down draw method, a redraw method, or a float method. In addition, the glass film is continuously unwound from the belt-shaped glass film by repeatedly performing the cutting starting point forming step and the split-cutting step on the belt-shaped glass film unrolled sequentially from the glass roll. May be.

  In each of the above embodiments, the cutting starting point is formed on the upper surface side of the belt-shaped glass film, but the cutting starting point may be formed on the lower surface side. In this case, for example, the connection part of the horizontal path and the upward gradient path connected to the downstream side of the horizontal path is used as the direction changing part, and the cutting start point is passed along the passage of the direction changing part through the cutting start point forming part. What is necessary is just to curve a formation part so that a lower surface side may become convex.

DESCRIPTION OF SYMBOLS 3 Band-shaped glass film 3a Upper surface 3b Width direction edge part 3c Back side edge part 3f Formation part 4 Cutting start point 5 Glass film 6aa Protective sheet 20aa Overhang part 25 Direction change part 26 Belt conveyor 26a Conveyance surface 30 Glass roll P4 Cutting start point formation process P5 Split cutting process S1 1st section S2 2nd section V1 Feeding speed V2 Feeding speed

Claims (9)

When cutting the band-shaped glass film in the width direction while transporting the band-shaped glass film in the longitudinal direction in a flat position along the conveyance path,
In the first section of the transport path, a cutting start point forming step of forming a cutting start point on one side along the width direction of the belt-shaped glass film, and in the second section of the transport path, the cutting start point forming portion It is a method for producing a glass film that is curved so that the one surface side is convex, and performs a split cutting step of breaking and cutting the strip glass film,
In the second section, there is provided a direction changing portion that changes the direction of the transport path in the middle, and the cutting start point forming portion is curved as the cutting start point forming portion passes through the direction changing portion. A method for producing a glass film, characterized by comprising: While forming the cutting starting point on the upper surface side of the strip glass film,
The glass film manufacturing method according to claim 1, wherein the cutting start point forming portion is curved so that the upper surface side is convex as the cutting start point forming portion passes through the direction changing portion. Method.   The direction changing unit is a connecting part of both an up-gradient path having the up-gradient path as the conveyance path and a down-gradient path having a down-gradient path as the down-gradient path connected to the downstream side of the up-gradient path. The method for producing a glass film according to claim 2, wherein:   The section for forming the cutting start point is maintained flat in a section located between the first section and the second section in the transport path. Glass film manufacturing method.   The glass film according to any one of claims 1 to 4, wherein the glass film is continuously cut out from the band-shaped glass film by repeatedly executing the cutting start point forming step and the split cutting step. Production method. A first transport device for transporting the glass film, and a second transport device for transferring the glass film unloaded from the first transport device;
6. The method for producing a glass film according to claim 5, wherein a feeding speed of the glass film by the second transporting device is set higher than a feeding speed of the glass film by the first transporting device. With respect to the conveyance surface of the first conveyance device, the conveyance surface of the second conveyance device is positioned below, and each glass film cut out from the belt-shaped glass film toward the conveyance surface of the second conveyance device Supply the corresponding protective sheet,
The glass film transported from the first transport device is dropped onto the protective sheet being transported by the second transport device, thereby transferring the glass film to the second transport device. The manufacturing method of the glass film of Claim 6.   When winding the band-shaped glass film into a roll to produce a glass roll, the rear side end of the band-shaped glass film to be wound is formed by performing the cutting start point forming step and the split cutting step. The manufacturing method of the glass film in any one of Claims 1-4 characterized by the above-mentioned. The method for producing a glass film according to any one of claims 1 to 8, wherein the cutting starting point is formed only at one end portion of both end portions in the width direction of the band-shaped glass film.

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