JP6468460B2 - Manufacturing method of glass film - Google Patents

Description

  The present invention provides a cleaning process for cleaning a strip glass film while transporting the strip glass film, and a liquid cutting method for removing the cleaning liquid adhering to the strip glass film in the cleaning process by jetting a gas to the strip glass film after the cleaning. The manufacturing method of the glass film containing the process.

  As is well known, glass substrates used in flat panel displays (FPDs) such as liquid crystal displays, plasma displays, and organic EL displays are becoming thinner with increasing demand for weight reduction. And in order to respond to such a request | requirement, the glass film reduced in thickness to 300 micrometers or less or 200 micrometers or less has been developed and manufactured.

  As a process for manufacturing this glass film, a cleaning process (for example, air) is performed on a cleaning process for cleaning the strip-shaped glass film that is the base of the glass film with a cleaning liquid (for example, water) while transporting the strip-shaped glass film. There is a liquid draining process for removing the cleaning liquid adhering to the belt-shaped glass film in the cleaning process by spraying the liquid. The strip-shaped glass film after the liquid draining step is wound into, for example, a roll and stored as a glass roll.

  Here, although it is not a method for performing the washing process and the liquid draining process on the belt-shaped glass film, the cleaning process and the liquid draining process are performed on the glass substrates already cut out one by one. An example of a technique for this is disclosed in Patent Document 1.

  In a general glass substrate cleaning method, a cleaning process is performed by spraying a cleaning liquid from a cleaning nozzle to the glass substrate on the upstream side of the glass substrate transport path. Thereafter, as shown in FIG. 7, on the downstream side of the transport path of the glass substrate GP, the glass substrate GP transported in the transport direction T from each of the first air knife 100 and the second air knife 101. The liquid draining process is executed by injecting the gas A.

  Both the first air knife 100 and the second air knife 101 inject gas A toward the upstream side of the conveyance path of the glass substrate GP. Furthermore, both the air knives 100 and 101 inject the gas A in the direction inclined with respect to the conveyance direction T of the glass substrate GP when the glass substrate GP is viewed in plan.

JP 2014-38914 A

  However, when such a method is applied to the step of cleaning the strip glass film and the step of draining liquid, the following problems to be solved have occurred.

  That is, when the same method is applied to the step of cleaning the strip-shaped glass film and the step of cutting off the liquid, as shown in FIG. 8, the pressure of the gas A injected from each of the air knives 100 and 101 is reduced. The band-shaped glass film G in the process is subjected to a load on one side in the width direction orthogonal to the transport direction T (the side on the leeward side of the gas A in the width direction). Here, since the thickness of the belt-shaped glass film G is extremely thin, the weight per unit length is very light. For this reason, the strip-shaped glass film G subjected to the load is skewed from the original feeding direction (conveying direction T), and the strip-shaped glass film G may be twisted. And the strip | belt-shaped glass film G might be damaged by the stress which acts on the strip | belt-shaped glass film G resulting from generation | occurrence | production of this twist.

  Moreover, even when the strip glass film does not result in breakage, for example, in the case where a glass roll is produced by winding the strip glass film after the liquid draining process around the core in the form of a roll, The problem like this has arisen. That is, due to the skew from the original feeding direction of the band-shaped glass film G in the liquid draining step, the width direction (axial direction of the core) between the layers of the band-shaped glass film G overlapped in a roll shape in the glass roll. ) Occurred, and the produced glass roll sometimes fell into a state unsuitable for storage.

  The present invention made in view of the circumstances as described above is a technique for preventing skewing from the original feeding direction of the band-shaped glass film at the time of performing the liquid draining process after the cleaning process is performed on the band-shaped glass film. As a general issue.

  The present invention, which was created to solve the above-mentioned problems, is a belt-shaped glass film in a cleaning region disposed in the transport path while transporting a flexible strip-shaped glass film in a flat posture along the longitudinal direction. The film is ejected from the liquid draining area to the downstream side by injecting gas to the strip glass film in the cleaning process for cleaning the film with the cleaning liquid, and in the liquid draining area disposed downstream of the cleaning path from the cleaning area. A method for producing a glass film including a liquid draining process for removing a cleaning liquid adhering in a cleaning process, and injecting gas onto the upper surface of the belt-shaped glass film and adhering to the upper surface with the pressure It is characterized in that a liquid pool made of the cleaning liquid is formed on the upper surface by blocking the downstream transfer of the cleaning liquid from the liquid draining region. Here, the “flat position” refers to a posture in which the strip glass film is in a posture parallel to the horizontal plane, or a posture in which the strip glass film is tilted within a range of 10 ° or less with respect to the horizontal plane. Means that

  According to such a method, the cleaning liquid that has been transferred to the liquid drainage region in a state of adhering to the upper surface of the belt-shaped glass film is moved downstream by the pressure from the gas injected to the upper surface in the liquid drainage region. Transfer can be blocked. And a liquid pool is formed on the upper surface of a strip | belt-shaped glass film because the washing | cleaning liquid continuously transferred from the upstream side is dammed up one after another. The liquid pool is stopped in the liquid drain region by the pressure from the gas, and the belt-shaped glass film sequentially passes through the liquid pool from the upstream side to the downstream side. And in the site | part (henceforth a liquid reservoir passage part) which has passed the liquid reservoir in a strip | belt-shaped glass film, the part of the part will increase in weight by the part which the liquid reservoir is formed on the upper surface. . This increase in weight makes it easier for the liquid reservoir passage portion to go straight along the original feeding direction, and skewing of the portion can be avoided. As a result, it is possible to prevent the belt-like glass film from being skewed from the original feeding direction at the time of the liquid draining process performed in the liquid draining region.

  In the above method, the belt-shaped glass film in the liquid drain region is transported while supporting the lower surface with a plurality of transport members arranged along the transport path, and the cleaning liquid is dammed between the plurality of transport members. It is preferable to form a pool.

  In this case, there is no support for the lower surface of the belt-shaped glass film between the plurality of conveying members. Therefore, if the cleaning liquid is blocked at this location to form a liquid pool, the liquid reservoir passage portion is on the upper surface. It bends downward due to the weight of the liquid pool formed above. As the liquid reservoir passage portion bends downward, the upper surface of the liquid reservoir passage portion is deformed into a concave curved surface that easily forms a liquid reservoir. Thereby, formation of a liquid pool can be stably maintained, and skewing from the original feeding direction of the band-shaped glass film can be more suitably prevented.

  In the above method, it is preferable to inject the gas toward the upstream side of the transport path.

  If it does in this way, it will become easy to make the pressure from gas act on the washing liquid adhering to the upper surface of a beltlike glass film. As a result, the transfer of the cleaning liquid adhering to the upper surface from the draining region to the downstream side can be more stably dammed, and a liquid pool can be more easily formed. As a result, it is possible to more suitably prevent skewing of the belt-shaped glass film from the original feeding direction.

  In said method, it is preferable to remove the washing | cleaning liquid adhering at the washing | cleaning process from the lower surface by injecting gas with respect to the lower surface of the strip | belt-shaped glass film in a liquid cutting area | region.

  If it does in this way, it is possible to remove a washing | cleaning liquid suitably from the lower surface of a strip | belt-shaped glass film.

  In said method, it is preferable to inject | pour the gas injected with respect to the upper surface of a strip | belt-shaped glass film, and the gas injected with respect to a lower surface toward the same site | part in the elongate direction of a strip | belt-shaped glass film.

  Different portions in the longitudinal direction of the belt-like glass film for gas injected to the upper surface (hereinafter referred to as upper surface side gas) and gas injected to the lower surface (hereinafter referred to as lower surface side gas) The following problems may occur when jetting is directed in a direction. That is, in each of the portions where the upper surface side gas and the lower surface side gas are injected, there is a possibility that the band glass film may be shaken by an external force acting on the band glass film due to the pressure from the gas. Then, there is a concern that the belt-shaped glass film is skewed from the original feeding direction due to the shaking. However, if the upper surface side gas and the lower surface side gas are directed and directed to the same portion in the longitudinal direction of the belt-shaped glass film, the following preferable actions and effects can be obtained. That is, the components in the thickness direction of both external forces, that is, the external force acting on the belt-shaped glass film due to the pressure from the upper surface side gas and the external force acting on the belt-shaped glass film due to the pressure from the lower surface side gas cancel each other. As a result, the thickness direction component in the resultant force of both external forces can be suppressed. As a result, it is possible to accurately avoid occurrence of a situation in which the band-shaped glass film is swayed and the band-shaped glass film is skewed from the original feeding direction due to the sway.

  In the above method, using the strip-shaped sheet body that follows the strip-shaped glass film, the last portion in the longitudinal direction of the strip-shaped glass film and the leading portion in the longitudinal direction of the strip-shaped sheet body are spanned between both portions. The sheet-like connecting member is connected to the sheet-like connecting member, and the sheet-like connecting member extends along a virtual straight line connecting the widthwise centers of the two parts and the width-wise centers of the two parts. It is preferable to provide a narrow portion interposed between each other.

  If it does in this way, the strip | belt-shaped glass film is a strip | belt-shaped sheet body by having connected the rearmost part in the longitudinal direction of a strip | belt-shaped glass film, and the head part in the longitudinal direction of a strip | belt-shaped sheet body via a sheet-like connection member. It will be a form to pull. And since the narrow part provided in the sheet-like connecting member extends along a virtual straight line connecting the width direction centers of both parts (the last part of the belt-like glass film and the head part of the belt-like sheet body), In the rearmost part of the belt-like glass film to which the wide part of the sheet-like connecting member is attached, a greater tension (tension generated as the belt-like sheet body is pulled) acts near the center in the width direction. Therefore, in the rearmost part of the belt-shaped glass film, the outer side in the width direction in a relaxed state with respect to the vicinity of the center in the width direction in the stretched state hangs downward. As a result, when the last part of the belt-shaped glass film passes through the liquid pool, the cleaning liquid constituting the liquid pool can be guided outward in the width direction in which it hangs down. Can be eliminated.

  In the above method, it is preferable to include a winding step of winding the band-shaped glass film in a roll shape around the winding core to form a glass roll on the downstream side of the transport path from the liquid draining region.

  In this way, since the skew feeding from the original feeding direction of the belt-shaped glass film is prevented in the liquid draining step, the glass roll produced by winding the belt-shaped glass film into a roll shape overlaps the roll shape. It is possible to avoid the occurrence of displacement in the width direction (axial direction of the core) between the layers of the strip-shaped glass film.

  According to this invention, after performing a washing | cleaning process with respect to a strip | belt-shaped glass film, it becomes possible to prevent the skew from the original feed direction of a strip | belt-shaped glass film at the time of execution of a liquid cutting process.

It is a side view which shows the manufacturing method of the glass film which concerns on embodiment of this invention. It is a top view which shows the sheet-like connection member used for the manufacturing method of the glass film which concerns on embodiment of this invention. It is a top view which shows the manufacturing method of the glass film which concerns on embodiment of this invention. It is a front view which shows the manufacturing method of the glass film which concerns on embodiment of this invention. It is a top view which shows the modification of the manufacturing method of the glass film which concerns on embodiment of this invention. It is a top view which shows the modification of the manufacturing method of the glass film which concerns on embodiment of this invention. It is a top view which shows the manufacturing method of the conventional glass substrate. It is a top view which shows the manufacturing method of the conventional glass film.

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

  As shown in FIG. 1, the manufacturing method of the glass film which concerns on embodiment of this invention arrange | positions in the conveyance path | route, conveying the strip | belt-shaped glass film G which has flexibility in a flat placing attitude | position along a longitudinal direction. The cleaning step of cleaning the strip-shaped glass film G with the cleaning liquid L in the cleaned cleaning region R1, and the gas A is sprayed onto the strip-shaped glass film G in the liquid draining region R2 arranged on the downstream side of the transport path from the cleaning region R1 Thus, for the band-shaped glass film G carried out from the liquid draining region R2 to the downstream side, a liquid draining step for removing the cleaning liquid L adhering in the cleaning step, and a belt-shaped band on the downstream side of the transport path from the liquid draining region R2. A winding process in which the glass film G is wound around the core 1 in a roll shape to form a glass roll GR. In this glass film manufacturing method, the belt-like glass film G being conveyed is connected in series with the belt-like sheet body 3 following the belt-like glass film G via the sheet-like connecting member 2.

  First, the strip-shaped glass film G, the strip-shaped sheet body 3, and the sheet-shaped connection member 2 used for this embodiment are demonstrated.

  The band-shaped glass film G is formed to have a thickness (for example, 300 μm or less) that can be formed long in one direction and can be flexible enough to be rolled up. The strip glass film G can be formed by various forming methods including a down draw method represented by an overflow down draw method, a slot down draw method, a redraw method and the like.

  The belt-like sheet body 3 is formed long in one direction in the same manner as the belt-like glass film G, and is formed to a thickness capable of imparting flexibility so that it can be wound into a roll. As a material of the belt-like sheet body 3, for example, a resin such as PET can be adopted.

  The sheet-like connecting member 2 can be made of a resin such as PET, for example. As shown in FIG. 2, the sheet-like connecting member 2 includes the rearmost portion Ge in the longitudinal direction of the strip-shaped glass film G (the last portion in the strip-shaped glass film G being conveyed) and the length of the strip-shaped sheet body 3. It spans between both parts Ge and 3f with the head part 3f in the scale direction (the part which comes to the head in the belt-like sheet 3 being conveyed). The sheet-like connecting member 2 extends along a wide portion 2a attached to each of the portions Ge and 3f, and a virtual straight line 2b connecting the centers in the width direction of the portions Ge and 3f. A narrow portion 2c interposed between each other is provided. Each of the wide portions 2 a is adhered to the last portion Ge of the strip-shaped glass film G and the leading portion 3 f of the strip-shaped sheet body 3 by the adhesive tape 4.

  Next, the specific aspect of the manufacturing method of the glass film which concerns on this embodiment is demonstrated.

  As shown in FIG. 1, in the cleaning process, the cleaning liquid L is sprayed toward the upper and lower surfaces Ga and Gb of the belt-shaped glass film G that has been conveyed to the cleaning region R <b> 1 in a flat position by the belt conveyor 5. To do. The cleaning liquid L is ejected from the cleaning liquid injectors 6 disposed on the upper surface Ga side and the lower surface Gb side with the belt-shaped glass film G sandwiched in the thickness direction. Both the cleaning liquid injector 6 disposed on the upper surface Ga side and the cleaning liquid injector 6 disposed on the lower surface Gb side spray the cleaning liquid L toward the same portion in the longitudinal direction of the belt-like glass film G. Yes. Further, the cleaning liquid L sprayed toward each of the upper and lower surfaces Ga and Gb is sprayed over the entire width of the belt-shaped glass film G. Here, as the cleaning liquid L, for example, water or the like can be used.

  The band-shaped glass film G that has undergone the above-described cleaning step is carried out from the cleaning region R1 to the downstream side with the cleaning liquid L attached to the upper and lower surfaces Ga, Gb.

  As shown in FIGS. 1 and 3, in the liquid draining process, gas A (hereinafter referred to as upper surface side gas A) is injected over the entire width of the upper surface Ga of the band-shaped glass film G that has undergone the cleaning process. Then, as shown by the white arrow in FIG. 3, the cleaning liquid L transferred to the liquid draining region R <b> 2 in a state of adhering to the upper surface Ga of the belt-like glass film G due to the pressure from the jetted upper surface side gas A. Then, it is dammed to be transferred further downstream from the liquid drain region R2. Thereby, a liquid pool LL made of the cleaning liquid L is formed on the upper surface Ga of the belt-shaped glass film G. In the same process, gas A (hereinafter referred to as lower surface side gas A) is also sprayed onto the lower surface Gb of the strip-shaped glass film G in the liquid drain region R2, and adheres to the lower surface Gb of the strip-shaped glass film G. The washed liquid L is removed.

  Both the upper surface side gas A and the lower surface side gas A are injected toward the upstream side of the transport path of the belt-shaped glass film G and are directed toward the same portion in the longitudinal direction of the belt-shaped glass film G. The upper surface side gas A and the lower surface side gas A are sprayed from the air knives 7 and 8 respectively disposed on the upper surface Ga side and the lower surface Gb side with the strip glass film G sandwiched in the thickness direction. Each of the air knives 7 and 8 is arranged so that its longitudinal direction is parallel to the width direction of the band-shaped glass film G in plan view. The air knife 7 (8) is formed with a plurality of upper surface side gas A (lower surface side gas A) injection ports along the longitudinal direction thereof, and the upper surface side gas compressed from each of these injection ports. A (lower surface side gas A) is injected at a uniform pressure. Here, as the upper surface side gas A (lower surface side gas A), for example, compressed air can be used.

  The belt-like glass film G in the liquid drain region R2 is conveyed while supporting the lower surface Gb with rollers 9 as a plurality of conveying members arranged along the conveying path. A distance D between adjacent rollers 9 is, for example, 300 mm. Transfer of the cleaning liquid L adhering to the upper surface Ga between the adjacent rollers 9 is blocked to form a liquid pool LL. Here, in the present embodiment, the liquid pool LL is formed on the upstream side of the transport path of the strip glass film G with the air knife 7 as a reference. The liquid pool LL is stopped in the liquid drain region R2 by the pressure from the upper surface side gas A, and the belt-like glass film G sequentially passes through the liquid pool LL from the upstream side to the downstream side. A portion Gc (hereinafter referred to as a liquid reservoir passage portion Gc) passing through the liquid reservoir LL in the belt-shaped glass film G bends downward due to the weight of the liquid reservoir LL formed on the upper surface Ga. Then, along with the occurrence of this bending, the upper surface Ga of the liquid reservoir passage portion Gc is deformed into a concave curved surface where the liquid reservoir LL can be easily formed.

  Here, due to the weight of the liquid pool LL formed on the upper surface Ga of the band-shaped glass film G, occurrence of a situation in which the band-shaped glass film G falls off from the plurality of rollers 9 or damage to the band-shaped glass film G is caused. In order to prevent this, the liquid reservoir LL is preferably formed so that the width dimension is 50% to 100%, and the length is 50% to 90%, based on the width dimension of the strip glass film G. It is more preferable to form as described above. Furthermore, the liquid reservoir LL is preferably formed so that the depth dimension thereof is 1 mm to 10 mm, and more preferably 3 mm to 5 mm. A part of the cleaning liquid L constituting the liquid pool LL may flow out from both ends in the width direction of the belt-shaped glass film G.

  The cleaning liquid L constituting the liquid pool LL is removed from the upper surface Ga of the band-shaped glass film G when the rearmost portion Ge of the band-shaped glass film G passes through the liquid pool LL. Specifically, as shown in FIG. 4, in the rearmost portion Ge of the belt-shaped glass film G, the outer side in the width direction hangs downward with respect to the vicinity of the center Gec in the width direction. As a result, when the rearmost portion Ge of the belt-shaped glass film G passes, the cleaning liquid L constituting the liquid pool LL is guided outward in the width direction in which it hangs down, and is dropped and removed from the upper surface Ga.

  In addition, in this embodiment, although the upper surface side gas A injected from the air knife 7 becomes an aspect injected toward the upstream of the conveyance path | route of the strip | belt-shaped glass film G, it is limited to such an aspect. It is not something. As a modified example, the upper surface side gas A is jetted directly from the air knife 7 within a range in which the transfer of the cleaning liquid L attached to the upper surface Ga to the downstream side can be blocked by the pressure from the upper surface side gas A. It is good also as an aspect, and it is good also as an aspect which injects the upper surface side gas A toward the downstream of the conveyance path | route of the strip | belt-shaped glass film G. Further, the liquid pool LL may be formed at an arbitrary position in the liquid drain region R2, and as a modification, the liquid pool LL may be formed directly below the air knife 7. Further, in the present embodiment, the upper surface side gas A and the lower surface side gas A are jetted in the same direction in the longitudinal direction of the belt-shaped glass film G. It is good also as an aspect injected in direction.

  Furthermore, in this embodiment, the injection port of the several upper surface side gas A (lower surface side gas A) formed in the air knife 7 (8) injects upper surface side gas A (lower surface side gas A) by equal pressure. However, the present invention is not limited to this. As a modification, as shown in FIG. 5, the air knife 7 injects the upper surface side gas A at a higher pressure as the injection port that injects the upper surface side gas A toward the outer side in the width direction of the belt-shaped glass film G. It is good also as an aspect. In addition, in the present embodiment, each of the air knives 7 and 8 has an aspect in which the longitudinal direction of the air knives 7 and 8 is arranged in parallel with the width direction of the strip glass film G in a plan view. Not as long. As a modification, the air knife 7 is divided into two, and the longitudinal direction of each of the divided air knives 7a and 7b is inclined with respect to the width direction of the belt-like glass film G as shown in FIG. It is good also as an aspect which arrange | positions the air knives 7a and 7b.

  The strip-shaped glass film G that has undergone the above-described liquid draining process is carried out from the liquid draining region R2 to the downstream side in a state where the cleaning liquid L has been removed from the upper and lower surfaces Ga, Gb.

  As shown in FIG. 1, in the winding process, the belt-shaped glass film G that has undergone the liquid draining process and the protective sheet S for protecting the upper and lower surfaces Ga, Gb of the belt-shaped glass film G are overlaid. Under these, these are wound around the core 1 in a roll shape to produce a glass roll GR. The protective sheet S is supplied by sequentially unwinding the protective sheet S from a sheet roll SR formed by winding the protective sheet S into a roll.

  The manufacturing method of the glass film which concerns on this embodiment is completed because the strip | belt-shaped glass film G passes through the above washing | cleaning process, a liquid cutting process, and a winding process.

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

  According to the manufacturing method of the glass film which concerns on this embodiment, the liquid reservoir passage part Gc which passes through the liquid reservoir LL stopped in the liquid draining region R2 is equivalent to the amount of the liquid reservoir LL formed on the upper surface Ga. , Its weight increases. The increase in the weight makes it easier for the liquid reservoir passage portion Gc to travel straight along the original feed direction, so that the skew of the liquid reservoir passage portion Gc can be avoided. As a result, it is possible to prevent the belt-like glass film G from being skewed from the original feeding direction at the time of the liquid draining process performed in the liquid draining region R2.

  Here, the manufacturing method of the glass film which concerns on this invention is not limited to the aspect demonstrated by said embodiment. In said embodiment, while transporting the strip | belt-shaped glass film in a liquid cutting area | region with the some roller arranged along the conveyance path | route, it has become the aspect which forms a liquid pool between adjacent rollers. But this is not the case. For example, the belt-shaped glass film in the liquid draining region is conveyed by a pair of belt conveyors that support both ends in the width direction from the lower surface side, and between the belt conveyors (supported by both of the pair of belt conveyors). It is good also as an aspect which forms a liquid pool in the part which is not). In this case, the liquid reservoir passage portion bends downward so as to bend and deform along the width direction with the weight of the liquid reservoir formed on the upper surface thereof.

DESCRIPTION OF SYMBOLS 1 Core 2 Sheet-like connection member 2a Wide part 2b Virtual straight line 2c Narrow part 3 Strip sheet body 3f Lead part 9 Roller A Gas G Strip glass film Ga Upper surface Gb Lower surface Ge Last part GR Glass roll L Cleaning liquid LL Liquid pool R1 Cleaning Area R2 Liquid drainage area

Claims (7)

A cleaning step of cleaning the strip-shaped glass film with a cleaning liquid in a cleaning region disposed in the transport path while transporting the flexible strip-shaped glass film in a flat posture along the longitudinal direction; Also, the step of cleaning the strip-shaped glass film carried out downstream from the drained region by injecting gas to the strip-shaped glass film in the drained region disposed on the downstream side of the transport path. A method for producing a glass film including a liquid draining step for removing the cleaning liquid adhering to
A liquid made of the cleaning liquid on the upper surface by spraying the gas onto the upper surface of the belt-shaped glass film and blocking the transfer of the cleaning liquid adhering to the upper surface from the liquid draining region to the downstream side by the pressure. A method for producing a glass film, comprising forming a pool.   The belt-shaped glass film in the liquid drain region is transported while supporting the lower surface with a plurality of transport members arranged along the transport path, and the cleaning liquid is dammed between the transport members. The method for producing a glass film according to claim 1, wherein a liquid pool is formed.   The method for producing a glass film according to claim 1, wherein the gas is injected toward an upstream side of the conveyance path.   The said washing | cleaning liquid adhering at the said washing | cleaning process is removed from a lower surface by injecting gas with respect to the lower surface of the said strip | belt-shaped glass film in the said liquid cutting area | region, The Claim 1 characterized by the above-mentioned. Glass film manufacturing method.   The gas sprayed onto the upper surface of the strip-shaped glass film and the gas sprayed onto the lower surface are sprayed while directing the same portion in the longitudinal direction of the strip-shaped glass film. 4. The method for producing a glass film according to 4. Using a belt-like sheet body following the belt-like glass film,
While connecting the last part in the longitudinal direction of the belt-like glass film and the leading part in the longitudinal direction of the belt-like sheet body via a sheet-like connecting member spanned between both parts,
A wide portion attached to each of the two portions on the sheet-like connecting member, and a narrow portion extending along a virtual straight line connecting the centers in the width direction of the two portions and interposed between the wide portions, The method for producing a glass film according to claim 1, wherein:   The winding process of winding the said strip | belt-shaped glass film into a roll shape around a winding core in the downstream of the said conveyance path | route from the said liquid cutting area | region, and making it a glass roll is included. The manufacturing method of the glass film of crab.

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