JP6323716B2 - Manufacturing method of glass film - Google Patents

Description

  The present invention relates to a method for producing a glass film using a downdraw method.

  As is well known, plate glass used in flat panel displays (FPD) such as liquid crystal displays, plasma displays, and organic EL displays has been promoted to be thinner with increasing demands for weight reduction. Glass films thinned to 300 μm or less or 200 μm or less have been developed and manufactured.

  As an example of a method for manufacturing this glass film, Patent Document 1 discloses a manufacturing method using a downdraw method represented by an overflow downdraw method, a redraw method, a slot downdraw method, and the like.

  In the manufacturing method disclosed in this document, first, a band-shaped glass film is formed by flowing down molten glass from a formed body in a longitudinal direction by a downdraw method (forming step). Next, by transporting the formed band-shaped glass film along a curved transport track, the transport direction is changed from the vertical direction to the horizontal direction (transport direction changing step). In changing the transport direction, a roller conveyor composed of a plurality of rollers arranged along a curved transport track is used. Then, the edge part of the said strip | belt-shaped glass film is cut | disconnected (horizontal conveyance process), conveying the strip | belt-shaped glass film in which the conveyance direction was changed to the horizontal direction (horizontal conveyance process). Finally, the band-shaped glass film from which the ears have been cut is wound around the core in a roll shape to obtain a glass roll (winding step).

  In addition, about the arrangement | positioning of a molded object, a roller conveyor, and a core, it is set as the arrangement | positioning which these are normally located on the same plane upright with respect to the horizontal surface. In other words, the strip-shaped glass film extending from the molded body to the core is arranged so that the conveyance direction is not changed along the width direction in the middle thereof. Thereby, a strip | belt-shaped glass film is conveyed by making only the direction along a longitudinal direction into a conveyance direction.

JP 2010-132531 A

  However, in the above manufacturing method, although the strip glass film is transported only in the longitudinal direction as the transport direction, twisting occurs in the strip glass film, so that the following There is a problem to be solved.

  That is, in the above manufacturing method, the belt-shaped glass film that shifts from the transport direction changing step to the lateral transport step is a belt-shaped glass film transport path that connects the roller conveyor and the core by winding the strip-shaped glass film with the core. In contrast, it is carried out from the roller conveyor substantially in parallel. On the other hand, the band-shaped glass film formed while the molten glass is caused to flow down in the vertical direction by executing the molding process is a molded body due to the influence of heat shrinkage and the like when the molten glass is cooled and solidified and formed into the band-shaped glass film. In some cases, the belt-like glass film is carried into the roller conveyor in an unreasonably inclined state with respect to the conveyance path of the belt-shaped glass film connecting the roller conveyor and the roller conveyor.

  When such a situation occurs, the belt-like glass film carried out from the roller conveyor and the belt-like glass film carried into the roller conveyor are continuously connected, so that there is inevitably a twist between the two. It will occur. And once twisting arises, this twisting inevitably deteriorated, and there was a problem that the strip-shaped glass film eventually broke.

  In addition, such a problem does not arise only when manufacturing a glass film by said manufacturing method, but glass by the manufacturing method including the above-mentioned shaping | molding process, a conveyance direction change process, and a horizontal conveyance process. In the case of producing a film, it is a problem that occurs in the same manner. Here, as an example of the manufacturing method including these steps, in the above manufacturing method, instead of the winding step, a cutting step for cutting the band-shaped glass film with the ears cut at every predetermined length is executed. And the manufacturing method which obtains several glass films can be mentioned.

  This invention made | formed in view of such a situation prevents the fracture | rupture of the said strip | belt-shaped glass film as much as possible about the strip | belt-shaped glass film shape | molded by the down draw method by preventing the deterioration of the generate | occur | producing twist. Is a technical issue.

  The present invention, which was created to solve the above-mentioned problems, has a forming step of forming a strip glass film while flowing molten glass in a longitudinal direction from the molded body by a down draw method, and the formed strip glass film is curved. By carrying along a conveyance track, the conveyance direction change process which changes the conveyance direction from the vertical direction to the horizontal direction, and the horizontal conveyance process which conveys the beltlike glass film in which the conveyance direction was changed in the horizontal direction were included. It is a manufacturing method of a glass film, and at the time of carrying out the transfer direction changing process, the belt-shaped glass film is transported by a plurality of conveyors arranged in parallel along the transport track and transported by each of the plurality of conveyors. Characterized by adjusting the speed independently. Here, the “lateral direction” means a horizontal direction or a direction inclined up and down within a range of 45 ° or less with respect to the horizontal direction (hereinafter the same).

  According to such a method, a difference can be provided in the conveyance speed which conveys a strip | belt-shaped glass film between several conveyors arrange | positioned in parallel along the conveyance track | orbit. That is, it becomes possible to convey each site | part of the width direction of the strip | belt-shaped glass film conveyed by each conveyor at a respectively different conveyance speed. From this, even if a twist occurs in the belt-shaped glass film and the belt-shaped glass film is transported in an inclined posture with respect to the original transport direction (feed direction by each conveyor), If the conveyance speed is adjusted, the twist of the belt-shaped glass film is eliminated. Thereby, the deterioration of the twist which generate | occur | produced in the strip | belt-shaped glass film can be prevented, and it becomes possible to prevent the strip | belt-shaped glass film to break as much as possible.

  In the above method, it is preferable that the plurality of conveyors be arranged symmetrically with reference to a boundary line extending along the center in the width direction of the belt-shaped glass film.

  If it does in this way, while the same number of conveyors will be arrange | positioned by the one side and the other side of the width direction on the basis of a boundary line, a conveyor will be arrange | positioned equally by the one side and the other side. For this reason, when twist occurs in the belt-shaped glass film, even if the posture is tilted in any direction with respect to the original transport direction (feed direction by each conveyor), the twist is preferably eliminated. Is possible.

  In said method, it is preferable to arrange | position a some conveyor only in the position along each of the width direction both ends of a strip | belt-shaped glass film.

  If it does in this way, the contact of the effective surface part (part used as a product) which exists between both ends in the width direction of a strip | belt-shaped glass film, and a conveyor can be suppressed. For this reason, in the transport direction changing step, it is possible to prevent as much as possible contamination and scratches on the effective surface portion due to contact with the conveyor. Thereby, it becomes advantageous when improving the quality of the product obtained from a strip-shaped glass film.

  In the above method, it is preferable that the position of the edge in the width direction of the belt-shaped glass film conveyed along the conveyance path is detected by the detection means, and the conveyance speed is adjusted by the control means that receives the signal from the detection means.

  In this way, the control means adjusts the transport speed of the belt-shaped glass film by each conveyor based on the position of the edge in the width direction of the belt-shaped glass film detected by the detection means. Can be eliminated with high accuracy.

  In the above method, each of the plurality of conveyors is a roller conveyor composed of a plurality of rollers arranged in series along the conveyance track, and the rotation peripheral speed or the rotation torque in a state where the plurality of rollers are synchronized. The conveyance speed may be adjusted by adjusting.

  If it does in this way, it becomes possible to adjust the conveyance speed of the strip | belt-shaped glass film by a roller conveyor by increasing / decreasing the rotational peripheral speed or rotational torque of a some roller.

  In the above method, each of the plurality of conveyors is provided with a drive rotating wheel, a driven rotating wheel, and a belt wound around these, and is disposed along the conveying track as a belt conveyor. The conveyance speed may be adjusted by adjusting the rotational peripheral speed or the rotational torque.

  If it does in this way, the conveyance speed of the strip | belt-shaped glass film by a belt conveyor can be adjusted by increasing / decreasing the rotational peripheral speed or rotational torque of a driving rotary wheel.

  In the above method, by injecting a fluid from below to the band-shaped glass film, the entire width in the width direction of the band-shaped glass film, or via a levitation conveyance process in which only a part in the width direction is levitated. Thus, it is preferable to shift the belt-shaped glass film from the transport direction changing step to the lateral transport step.

  In this way, the entire width in the width direction of the band-shaped glass film or only a part in the width direction is lifted so that the frictional force does not act on the band-shaped glass film during the levitation conveyance process or the friction that acts. Force is reduced. Thereby, since the band-shaped glass film in the levitation conveyance process is easily moved along the width direction, it is possible to more suitably eliminate the twist generated in the band-shaped glass film.

  In said method, while performing the horizontal conveyance process, while performing the ear | edge part cutting process which cut | disconnects the ear | edge part of a strip | belt-shaped glass film, after execution of a horizontal conveyance process, it rolls the strip | belt-shaped glass film from which the ear | edge part was cut | disconnected. You may perform the winding process which winds up around a roll shape and makes it a glass roll.

  If it does in this way, since it becomes possible to perform an ear | edge part cutting process and a winding process about the strip | belt-shaped glass film without a twist, these both processes can be performed with high precision.

  As described above, according to the present invention, it is possible to prevent deterioration of the generated twist in the band-shaped glass film formed by the downdraw method, and to prevent breakage of the band-shaped glass film as much as possible. be able to.

It is a schematic side view which shows the manufacturing method of the glass film which concerns on 1st embodiment of this invention. It is a perspective view which shows the conveyance direction change process of the manufacturing method of the glass film which concerns on 1st embodiment of this invention. It is a figure which shows the form of control about the conveyance direction change process of the manufacturing method of the glass film which concerns on 1st embodiment of this invention. It is a front view which shows the conveyance direction change process of the manufacturing method of the glass film which concerns on 1st embodiment of this invention. It is a perspective view which shows the conveyance direction change process of the manufacturing method of the glass film which concerns on 2nd embodiment of this invention. It is a figure which shows the form of control about the conveyance direction change process of the manufacturing method of the glass film which concerns on 2nd embodiment of this invention. It is a perspective view which shows the conveyance direction change process of the manufacturing method of the glass film which concerns on 3rd 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>
First, the manufacturing method of the glass film which concerns on 1st embodiment of this invention is demonstrated.

  As shown in FIG. 1, in the method for producing a glass film according to the first embodiment of the present invention, first, as a forming step, a band-shaped glass is formed while flowing molten glass MG vertically from a formed body 1 by an overflow downdraw method. Film GF is formed. Next, as the transport direction changing step, the transported direction is changed from the vertical direction to the horizontal direction by transporting the formed glass strip GF along the curved transport track T. Thereafter, the strip-shaped glass film GF whose transport direction has been changed is transported in the lateral direction as a lateral transport step through a levitation transport step in which the strip-shaped glass film GF is transported in a floated state. During the execution of the lateral conveyance step, the ear portion GFa of the strip-shaped glass film GF is cut as an ear portion cutting step. Finally, as a winding process, a band-shaped glass film GF (effective surface part GFb used as a product) from which the ear part GFa has been cut is wound around the core 2 in a roll shape to obtain a glass roll GR.

  In addition, in this embodiment, it is set as the aspect conveyed in the horizontal direction by making the strip | belt-shaped glass film GF by which the conveyance direction was changed into a horizontal direction. However, the present invention is not limited to this, and the belt-shaped glass film GF may be transported in a direction inclined in a range of 45 ° or less with respect to the horizontal direction.

  In the molding step, ribbon-shaped molten glass MG is continuously generated by the molded body 1 having a wedge-shaped cross-sectional shape and having an overflow groove 1a formed thereon. And by the cooling roller 3 for controlling the shrinkage | contraction to the width direction of this ribbon-shaped molten glass MG, and the annealer roller 41 arrange | positioned in multiple stages in the annealer 4 for removing distortion, The ribbon-shaped molten glass MG is pulled out downward while being sandwiched from both the front and back sides, thereby forming the strip-shaped glass film GF. In addition, a support roller 5 is arranged immediately below the annealer roller 41 to draw the strip-shaped glass film GF from the both sides of the front and back while pulling it downward. The support roller 5 stretches the strip-shaped glass film GF in the annealer 4. I have it.

  In this embodiment, the glass strip GF is formed by the overflow down draw method, but the present invention is not limited thereto, and the strip glass film GF is formed by the slot down draw method, the redraw method, or the like. Also good.

  In the transport direction changing step, as shown in FIG. 2, three roller conveyors 6, 7, 8 (hereinafter referred to as a first roller conveyor 6, a second roller conveyor 7, The belt-like glass film GF is conveyed by a three-roller conveyor 8), and the conveyance speeds V1, V2, and V3 of the belt-like glass film GF by the first to third roller conveyors 6, 7, and 8 are independently adjusted. . Thereby, when twist occurs in the strip glass film GF, the twist is eliminated and deterioration of the twist is prevented.

  The first to third roller conveyors 6, 7, and 8 are arranged symmetrically with respect to a boundary line B that extends along the center in the width direction of the belt-shaped glass film GF. The second roller conveyor 7 mainly conveys the effective surface portion GFb of the band-shaped glass film GF, and the first and third roller conveyors 6 and 8 mainly convey the ear portion GFa of the band-shaped glass film GF. Each of the first to third roller conveyors 6, 7, and 8 includes a plurality of rollers 61, 71, and 81 (hereinafter referred to as a first roller 61 and a second roller) arranged in series along the transport track T at equal intervals. 71 and the third roller 81). Moreover, each of the 2nd roller 71 which comprises the 2nd roller conveyor 7 arrange | positioned in the center among the 1st-3rd roller conveyors 6, 7, 8 comprises the 1st, 3rd roller conveyors 6,8. Compared with each of the 1st and 3rd rollers 61 and 81, it forms so that the full length of the axial direction may become long. Further, the first to third rollers 61, 71, 81 are formed so that they have the same diameter.

  As shown in FIG. 3, each of the first to third rollers 61, 71, 81 has a motor 9, 10, 11 (hereinafter referred to as “rotating drive”) that drives the first to third rollers 61, 71, 81 to rotate. , First motor 9, second motor 10, and third motor 11). Each of the first motors 9 that rotationally drive each of the first rollers 61 is connected to the same inverter 12 (hereinafter referred to as the first inverter 12). Based on the signal S4 from the first inverter 12, the operation of the plurality of first motors 9 is controlled. Thereby, the plurality of first rollers 61 are configured to be rotationally driven in a state in which the rotational peripheral speeds are synchronized.

  The conveyance speed V1 of the band-shaped glass film GF by the first roller conveyor 6 is independently adjusted by the magnitude of the rotational peripheral speed of the plurality of first rollers 61.

  Similarly, each of the second motor 10 and each of the third motor 11 is connected to the same inverters 13 and 14 (hereinafter referred to as the second inverter 13 and the third inverter 14). The operations of the second and third motors 10 and 11 are controlled based on signals S5 and S6 from the second and third inverters 13 and 14, respectively. Accordingly, the plurality of second and third rollers 71 and 81 are configured to be rotationally driven in a state in which the rotational peripheral speed is synchronized between the second rollers 71 and the third rollers 81.

  Depending on the rotational peripheral speeds of the plurality of second and third rollers 71 and 81, the transport speeds V2 and V3 of the strip glass film GF by the second and third roller conveyors 7 and 8 are independently adjusted.

  In addition, in this embodiment, conveyance of the strip | belt-shaped glass film GF by each of the 1st-3rd roller conveyors 6, 7, and 8 by the magnitude of the rotational peripheral speed of several 1st-3rd rollers 61,71,81. Although the speeds V1, V2, and V3 are adjusted independently, this is not restrictive. In adjusting the conveyance speeds V1, V2, and V3 independently, the plurality of first to third rollers 61, 71, and 81 have rotational torques of the first rollers 61, the second rollers 71, and the third rollers. As a configuration in which the rotational drive is performed in a state in which the two 81 are synchronized with each other, the conveyance speeds V1, V2, and V3 may be independently adjusted according to the magnitude of the rotational torque.

  Each of the first to third inverters 12, 13, and 14 is a controller that transmits signals S1, S2, and S3 for causing the inverters 12, 13, and 14 to control the first to third motors 9, 10, and 11, respectively. 15 is connected. The controller 15 is operated by a monitor who monitors the transport direction changing process.

  To summarize the above, first, signals S1, S2, and S3 are transmitted from the controller 15 to the first to third inverters 12, 13, and 14 by the operation of the controller 15 by the supervisor. Next, signals S4, S5, and S6 are transmitted from the first to third inverters 12, 13, and 14 that have received the signals S1, S2, and S3 to the first to third motors 9, 10, and 11, respectively. The Thereby, while operation | movement of several 1st-3rd motors 9,10,11 is controlled, several 1st-3rd rollers 61,71,81 are 1st rollers 61, 2nd rollers 71, The third rollers 81 are rotationally driven in a state where their rotational peripheral speeds (rotational torque when the conveying speeds V1, V2, and V3 are independently adjusted depending on the magnitude of the rotational torque) are synchronized. Depending on the magnitude of this rotational peripheral speed (rotational torque), the transport speeds V1, V2, and V3 of the strip glass film GF by the first to third roller conveyors 6, 7, and 8 are independently adjusted.

  Here, in a state where the band-shaped glass film GF is not twisted, the conveyance speeds V1, V2, and V3 are adjusted to the same speed by the operation of the controller 15 by the supervisor. In the present embodiment, the conveying speeds V1, V2, and V3 in the initial state where no twist is generated are set to the same speed V as the speed at which the band-shaped glass film GF is drawn downward in the forming process. (Hereinafter referred to as basic speed V).

  Hereinafter, when a twist occurs in the strip glass film GF, a specific procedure for eliminating the twist will be described in detail.

  As shown in FIG. 4, the band-shaped glass film GF molded by the molded body 1 is affected by heat shrinkage or the like when the molten glass MG cools and hardens, and as shown in FIG. The first to third roller conveyors 6, 7, in an inappropriately inclined state (the posture inclined with respect to the feeding direction by the first to third roller conveyors 6, 7, 8) 8 may be carried in. As a result, twisting occurs in the band-shaped glass film GF.

  The monitor grasps the occurrence of the twist by visually checking the wrinkles W formed on the band-shaped glass film GF as the twist is generated. In the case shown in FIG. 4, the wrinkles W are formed at the site on the side conveyed by the third roller conveyor 8 in the width direction of the belt-shaped glass film GF. In such a case, the supervisor operates the controller 15 to make the transport speed V1 faster than the basic speed V and make the transport speed V3 slower than the basic speed V. On the other hand, the transport speed V2 is maintained at the basic speed V without being changed. In this embodiment, the transport speed V1 is 1.03 times the basic speed V, and the transport speed V3 is 0.97 times the basic speed V. In this way, differences are provided in the conveyance speeds V1, V2, and V3.

  Thereby, the site | part of the side conveyed by the 1st roller conveyor 6 is conveyed at high speed with respect to the site | part conveyed by the 3rd roller conveyor 8 in the width direction of the strip | belt-shaped glass film GF. And if this state is maintained, a strip | belt-shaped glass film will be pulled by the 1st roller conveyor 6 side adjusted to relatively high conveyance speed V1, and the wrinkles W will lose | disappear gradually from the said strip-shaped glass film GF. The supervisor grasps the elimination of the twist by visually confirming that the wrinkles W have disappeared from the belt-shaped glass film GF. Even after the twist of the band-shaped glass film GF is eliminated, each of the conveyance speeds V1, V2, and V3 is maintained at the adjusted conveyance speeds V1, V2, and V3 adjusted to eliminate the twist.

  As described above, the twist generated in the belt-shaped glass film GF can be eliminated, and deterioration of the twist can be prevented. Thereby, the fracture | rupture of the strip | belt-shaped glass film GF can be prevented as much as possible.

  In this embodiment, the transport speed V1 is made faster than the basic speed V, and the transport speed V3 is made slower than the basic speed V, so that the transport speeds V1, V2, and V3 are different. This is not the case. In making a difference in the transport speeds V1, V2, and V3, the transport speed V2 is set lower than the transport speed V1 while maintaining the basic speed V without changing the transport speed V1, and the transport speed V3 is set to the transport speed. It is good also as an aspect made further slower than V2. Further, it is not always necessary to make all of the transport speeds V1, V2, and V3 different. In the state where the transport speeds V1 and V2 are maintained at the basic speed V without being changed, only the transport speed V3 is set higher than the transport speeds V1 and V2. It is good also as an aspect made late. Furthermore, it is good also as an aspect which makes conveyance speed V2, V3 the same speed slower than conveyance speed V1, in the state maintained at basic speed V, without changing only conveyance speed V1.

  In addition, in providing a difference in the transport speeds V1, V2, and V3, the transport speed V2 is set to be higher than the transport speed V3 while maintaining the basic speed V without changing the transport speed V3, and the transport speed V1. It is good also as an aspect made still faster than conveyance speed V2. Furthermore, it is good also as an aspect which makes only conveyance speed V1 faster than conveyance speed V2, V3 in the state maintained at basic speed V, without changing conveyance speed V2, V3. In addition, the transport speeds V1 and V2 may be set to the same speed higher than the transport speed V3 while maintaining the basic speed V without changing only the transport speed V3.

  When the transport speeds V1, V2, and V3 are changed from the basic speed V as described above, if they are made faster than the basic speed V, the upper limit is 1.20 times the basic speed V. It is preferable to make it as fast as possible. Furthermore, when making these slower than the basic speed V, it is preferable to make the speed 0.80 times lower than the basic speed V as a lower limit.

  Moreover, in this embodiment, although it becomes the aspect which conveys the strip | belt-shaped glass film GF with the three roller conveyors of the 1st-3rd roller conveyors 6, 7, and 8, it is not this limitation, Four or more sets | groups It is good also as an aspect which conveys the strip | belt-shaped glass film GF with a roller conveyor. If an example is given, it is good also as an aspect which arrange | positions four roller conveyors symmetrically on the basis of the boundary line B extended along the width direction center of the strip glass film GF, and conveys the strip glass film GF by these. In this way, since the number of roller conveyors that can adjust the transport speed of the band-shaped glass film GF increases, the twist generated in the band-shaped glass film GF can be more accurately eliminated. .

  Moreover, in this embodiment, although it becomes the aspect which conveys the strip | belt-shaped glass film GF with a roller conveyor, it is not this limitation. In place of the first to third roller conveyors 6, 7, 8, a driving pulley as a driving rotating wheel, a driven pulley as a driven rotating wheel, and a belt wound around these are provided, and the conveying track T It is good also as an aspect which conveys the strip | belt-shaped glass film GF with three belt conveyors arrange | positioned along. In this case, the conveyance speeds V1, V2, and V3 of the belt-like glass film GF by each of the three belt conveyors can be independently adjusted according to the rotational peripheral speed of the driving pulley or the rotational torque. it can.

  In the levitation transporting process, air A as a fluid is sprayed from below onto the strip-shaped glass film GF to transport only the central portion (mainly the effective surface portion GFb) in the width direction of the strip-shaped glass film GF. .

  The belt conveyor 16 used for transporting the belt-shaped glass film GF in the levitation transport process is disposed close to the first to third roller conveyors 6, 7, and 8. The belt conveyor 16 is disposed on the inner peripheral side of the belt 16a and an endless belt 16a for conveying the non-floating portion (mainly the ear portion GFa) of the belt-like glass film GF, and air A is directed upward. An air injector (not shown). The belt 16a has a large number of fine through holes (not shown) formed over the entire width in the width direction, and the air A injected from the air injector passes through the through holes and reaches the belt-like glass film GF. To do. Further, the air injector disposed on the inner peripheral side of the belt 16a is disposed along the center portion in the width direction of the belt 16a.

  By using this belt conveyor 16, the belt-shaped glass film GF that has been unloaded from the first to third roller conveyors 6, 7, 8 and then loaded into the belt conveyor 16 is subjected only to the central portion by the pressure of air A. It is transported in the horizontal direction (horizontal direction) while being levitated. If it does in this way, the frictional force which acts on the strip | belt-shaped glass film GF in a floating conveyance process will be reduced. Accordingly, the band-shaped glass film GF during the levitation conveyance process can easily move along the width direction, and the twist generated in the band-shaped glass film GF can be preferably eliminated.

  In addition, in this embodiment, although it has the aspect which conveys in the state which floated only the center part in the width direction of the strip | belt-shaped glass film GF, it is not this limitation, and it conveys in the state which floated the full width in the width direction It is good also as an aspect to do. If it does in this way, a frictional force will not act on the strip | belt-shaped glass film GF in a floating conveyance process. As a result, the band-shaped glass film GF during the levitation conveyance process is more easily moved along the width direction, so that twisting can be more preferably eliminated.

  In the horizontal conveyance process, the belt-shaped glass film GF unloaded from the belt conveyor 16 is conveyed in the horizontal direction (horizontal direction) by the belt conveyor 17 disposed adjacent to the belt conveyor 16. Moreover, during the execution of the horizontal conveyance process, a cutting process for cutting the ear portion GFa of the strip-shaped glass film GF is performed using a laser cleaving method.

  In the ear cutting step, a laser irradiator 18 and a refrigerant injector 19 which are fixedly installed at a fixed point above the belt conveyor 17 are used. The laser irradiator 18 irradiates the laser L continuously along the boundary between the ear portion GFa of the belt-like glass film GF passing therebelow and the effective surface portion GFb. The refrigerant injector 19 continuously injects the refrigerant R to the portion of the belt-shaped glass film GF irradiated with the laser L.

  Thereby, due to the temperature difference between the part heated by the laser L and the part cooled by the refrigerant R, a thermal stress is generated in the strip glass film GF, and the thermal stress causes the ear part GFa. A cleaving portion (a portion where the ear portion GFa and the effective surface portion GFb are cut and separated) is continuously formed along the boundary between the effective surface portion GFb. Thus, the ear | edge part GFa of the strip | belt-shaped glass film GF is cut | disconnected continuously.

  The belt-shaped glass film GF (effective surface portion GFb) from which the ear portion GFa has been cut is unloaded from the belt conveyor 17 and then loaded into the belt conveyor 20 disposed adjacent to the belt conveyor 17. On the other hand, the cut ear GFa is unloaded from the belt conveyor 17 and then retracted downward without being loaded into the belt conveyor 20.

  In the winding process, the belt-shaped glass film GF (effective surface portion GFb) carried out from the belt conveyor 20 is overlapped with the protective sheet S, and then wound around the winding core 2 in a roll shape to obtain a glass roll GR. The protective sheet S is overlapped with the belt-shaped glass film GF by continuously unwinding the protective sheet S from a sheet roll SR formed by winding the protective sheet S into a roll. As described above, the production of the glass film is completed by performing the forming process to the winding process.

  In addition, in this embodiment, although it is set as the aspect which obtains the glass roll GR by performing a winding process, it is not this limitation. Instead of the winding step, a plurality of glass films may be obtained by executing a cutting step of cutting the band-shaped glass film GF (effective surface portion GFb) from which the ear portion GFa has been cut every predetermined length.

<Second embodiment>
Hereinafter, the manufacturing method of the glass film which concerns on 2nd embodiment of this invention is demonstrated. In the description of the second embodiment, the elements already described in the first embodiment are denoted by the same reference numerals in the drawings referred to in the description of the second embodiment, and the duplicate description is omitted. Only differences from the embodiment will be described.

  As shown in FIG.5 and FIG.6, in the manufacturing method of the glass film which concerns on 2nd embodiment of this invention, the width direction edge of the strip | belt-shaped glass film GF conveyed along the conveyance track | orbit T in a conveyance direction change process. The position of GFc (edge) is detected by the camera 21 and the image processing device 22. Then, the determination circuit 23 that has received the signal S7 from the image processing device 22 performs the determination described later. The conveyance speeds V1, V2, and V3 are adjusted based on the determination result.

  The camera 21 is fixedly installed at a fixed point so that the edge GFc in the width direction of the belt-shaped glass film GF being conveyed passes through the field of view 21a (the area shown by hatching in FIG. 5), and the captured image The image data GD is transmitted to the image processing device 22. The image processing device 22 detects the position of the edge GFc in the width direction of the band-shaped glass film GF from the received image data GD by edge detection processing. Then, the image processing device 22 transmits the detected position of the width direction edge GFc to the determination circuit 23 as a signal S7.

  The determination circuit 23 determines whether or not the deviation of the position of the width direction edge GFc from the basic position exceeds a preset allowable value based on the signal S7 received from the image processing device 22. Here, the basic position is a position where the edge GFc in the width direction passes through the field of view 21a of the camera 21 when the band-shaped glass film GF is not twisted. Then, the determination circuit 23 transmits the determination result to the first to third inverters 12, 13, and 14 as signals S1, S2, and S3.

  Thereby, twist occurs in the band-shaped glass film GF, and when the deviation from the basic position of the position of the width direction edge GFc exceeds the allowable value, the first to third inverters 12, 13, 14, and By adjusting the transport speeds V1, V2, and V3 by the first to third motors 9, 10, and 11, the position at which the width direction edge GFc passes through the field of view 21a of the camera 21 is changed. The camera 21 and the image processing device 22 detect the position of the edge GFc in the width direction after the change again.

  To summarize the above, (1) the camera 21 and the image processing device 22 detect the position of the edge GFc in the width direction. (2) The determination circuit 23 determines whether or not the deviation of the position of the width direction edge GFc from the basic position exceeds an allowable value. → (3) The position of the width direction end GFc is changed by adjusting the conveyance speeds V1, V2, and V3. (1) The camera 21 and the image processing device 22 detect the position (position after change) of the width direction end GFc. A series of such loops are repeated until the deviation of the position of the width direction edge GFc from the basic position becomes equal to or less than the allowable value. Thereby, the twist produced | generated in the strip | belt-shaped glass film GF is eliminated. In the initial state where no twist is generated in the band-shaped glass film GF, the transport speeds V1, V2, and V3 are adjusted to the basic speed V.

  Here, in the present embodiment, the camera 21 and the image processing device 22 constitute detection means. The determination circuit 23, the first to third inverters 12, 13, and 14, and the plurality of first to third motors 9, 10, and 11 constitute a control means.

  If it does in this way, based on the position of the edge GFc of the width direction of the strip | belt-shaped glass film GF which the detection means (camera 21, image processing apparatus 22) detected, a control means (determination circuit 23, the 1st-3rd inverter 12). , 13, 14 and the plurality of first to third motors 9, 10, 11) adjust the conveying speeds V1, V2, V3, so that the twist generated in the strip glass film GF can be eliminated with high accuracy. it can.

  In the present embodiment, the camera 21 and the image processing device 22 are configured to detect the position of the edge GFc in the width direction of the band-shaped glass film GF. The position of the direction end edge GFc may be detected.

<Third embodiment>
Hereinafter, the manufacturing method of the glass film which concerns on 3rd embodiment of this invention is demonstrated. In addition, also in description of 3rd embodiment, about the element already demonstrated in said 1st embodiment, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol to drawing referred in description of 3rd embodiment, Only differences from the first embodiment will be described.

  The point that the glass film manufacturing method according to the third embodiment of the present invention differs from the glass film manufacturing method according to the first embodiment is that, as shown in FIG. It is a point that has been removed. Thereby, only the 1st and 3rd roller conveyors 6 and 8 which mainly convey the ear | edge part GFa of the strip | belt-shaped glass film GF are arrange | positioned in the position along the width direction both ends of the said strip | belt-shaped glass film GF in a conveyance direction change process. Has been.

  Thus, if the strip | belt-shaped glass film GF is conveyed only by the 1st, 3rd roller conveyors 6 and 8, the contact with the 1st, 3rd roller conveyors 6 and 8 and the effective surface part GFb can be suppressed. Therefore, in the transport direction changing step, it is possible to prevent as much as possible contamination and scratches on the effective surface portion GFb due to contact with the first and third roller conveyors 6 and 8. This is advantageous in improving the quality of a product obtained from the band-shaped glass film GFb (effective surface portion GFb).

DESCRIPTION OF SYMBOLS 1 Molded body 2 Roll core 6-8 Roller conveyor 9-11 Motor 12-14 Inverter 21 Camera 22 Image processing device 23 Judgment circuit A Air B Boundary line GF Band glass film GFa Band glass film ear GFc Band glass film width Directional edge GR Glass roll MG Molten glass S1 to S7 Signal T Transport track V1 to V3 Transport speed

Claims (8)

By forming the strip glass film while flowing the molten glass from the molded body in the longitudinal direction by the down draw method, and transporting the formed strip glass film along a curved transport track, the transport direction is changed. A method for producing a glass film, comprising a conveying direction changing step for changing from a vertical direction to a horizontal direction, and a horizontal conveying step for conveying the belt-like glass film whose conveying direction has been changed in a horizontal direction,
When the transport direction changing step is performed, the belt-shaped glass film is transported by a plurality of conveyors arranged in parallel along the transport track, and the transport speed of the belt-shaped glass film by each of the plurality of conveyors is made independent. And a method for producing a glass film.   The method for producing a glass film according to claim 1, wherein the plurality of conveyors are arranged symmetrically with respect to a boundary line extending along the center in the width direction of the band-shaped glass film.   3. The method for producing a glass film according to claim 1, wherein the plurality of conveyors are arranged only at positions along both ends in the width direction of the belt-shaped glass film.   The position of the edge in the width direction of the belt-shaped glass film conveyed along the conveyance path is detected by a detection unit, and the conveyance speed is adjusted by a control unit that receives a signal from the detection unit. The manufacturing method of the glass film in any one of Claims 1-3. Each of the plurality of conveyors, as a roller conveyor composed of a plurality of rollers arranged in series along the transport path,
5. The glass film according to claim 1, wherein the conveyance speed is adjusted by adjusting a rotational peripheral speed or a rotational torque in a state where the plurality of rollers are synchronized. Manufacturing method. Each of the plurality of conveyors includes a driving rotating wheel, a driven rotating wheel, and a belt wound around them, and a belt conveyor disposed along the conveying track.
The method for producing a glass film according to any one of claims 1 to 4, wherein the conveyance speed is adjusted by adjusting a rotational peripheral speed or a rotational torque of the driving rotary wheel.   By injecting a fluid from below to the band-shaped glass film, the entire width in the width direction of the band-shaped glass film, or through a levitation conveyance step of conveying in a state where only a part in the width direction is levitated, The manufacturing method of the glass film in any one of Claims 1-6 which transfers a strip | belt-shaped glass film to the said horizontal conveyance process from the said conveyance direction change process. During the execution of the horizontal conveyance step, an ear cutting step for cutting the ear portion of the band-shaped glass film is performed, and after the execution of the horizontal conveyance step, the band-shaped glass film from which the ear portion has been cut is wound. The manufacturing method of the glass film in any one of Claims 1-7 which performs the winding-up process which winds up in the shape of a roll around and makes it a glass roll.

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