JP6848721B2 - Glass film manufacturing method - Google Patents

Description

The present invention relates to a method for producing a glass film, which comprises a cleaning step of cleaning the front and back surfaces of the glass ribbon while transporting the glass ribbon along the longitudinal direction.

As is well known, the manufacturing process of the glass film may include a cleaning step of cleaning the front and back surfaces of the glass ribbon on which the glass film is manufactured. Thereby, for example, even when the front and back surfaces of the glass ribbon are contaminated due to the overlapping with the protective sheet, the front and back surfaces can be cleaned by executing the cleaning step. Here, Patent Document 1 discloses an example of a mode in which the cleaning step is executed.

As shown in FIG. 4, in the embodiment disclosed in the same document, the glass ribbon G is conveyed along the longitudinal direction (V direction shown in the same figure), and the front surface Ga side and the back surface Gb side are paired. The front and back surfaces Ga and Gb are cleaned with a pair of roll brushes B and B. Each of the pair of roll brushes B and B is rotated in a direction opposite to the transport direction (V direction) of the glass ribbon G.

JP 2015-181980

However, when the cleaning step is executed in the above mode, the following problems to be solved have occurred.

That is, in the above aspect, since the pair of roll brushes are both rotated in the direction opposite to the transport direction of the glass ribbon, an excessive tension acts on the glass ribbon on the downstream side of the transport path with respect to both roll brushes. There is a drawback that it is easy to fall into a state. As a result, there is a problem that the glass ribbon (for example, a thickness of 300 μm or less), which has been promoted to be thinned in recent years, is easily damaged by cleaning the front and back surfaces. Under these circumstances, it has been expected to establish a technique that enables cleaning of the front and back surfaces without damaging the glass ribbon even if the thickness of the glass ribbon is thin.

In the present invention made in view of the above circumstances, when the front and back surfaces of the glass ribbon are washed while being conveyed along the longitudinal direction, the front and back surfaces of the glass ribbon are not damaged regardless of the thickness of the glass ribbon. Making cleaning possible is a technical issue.

The present invention, which was devised to solve the above problems, is a cleaning method in which the front and back surfaces are cleaned by a rotary cleaning body paired on the front surface side and the back surface side of the glass ribbon while transporting the glass ribbon along the longitudinal direction. A method for manufacturing a glass film including a step, in which one of a pair of rotary cleaning bodies is a reverse rotation cleaning body that rotates in a direction opposite to the transport direction of the glass ribbon, and the other is a transport direction of the glass ribbon. It is characterized in that the cleaning process is performed in a state of a forward-rotating cleaning body that rotates in a direction that follows the above.

In this method, during the execution of the cleaning step, one of the paired rotary wash bodies is a reverse rotary wash body and the other is a forward rotary wash body, so that both rotary wash bodies are oriented in opposite directions. It is rotating to. As a result, the tension acting on the glass ribbon can be suppressed by the amount that both rotary cleaning bodies rotate in opposite directions. As a result, even if the thickness of the glass ribbon is thin, it is possible to prevent the glass ribbon from being damaged. From the above, according to this method, when cleaning the front and back surfaces of the glass ribbon while transporting it along the longitudinal direction, the front and back surfaces of the glass ribbon are not damaged regardless of the thickness of the glass ribbon. Cleaning becomes possible.

In the above method, it is preferable that the rotation peripheral speed of the forward rotation cleaning body is made higher than the transport speed of the glass ribbon.

Since the cleaning ability of the rotary washer depends on the relative speed between the rotary washer and the glass ribbon, it is possible to more effectively wash the rotary washer by rotating it at a higher speed. Further, the frictional force acting on the glass ribbon by the reverse rotation cleaning body always acts in the opposite direction to the transport direction of the glass ribbon. On the other hand, the frictional force acting on the glass ribbon by the forward-rotating cleaning body changes in the direction in which it acts depending on whether the rotational peripheral speed of the forward-rotating cleaning body is higher or lower than the transport speed of the glass ribbon. More specifically, when the peripheral rotation speed is faster than the transport speed, the frictional force acts in the transport direction of the glass ribbon, and when the peripheral rotation speed is lower than the transport speed, the frictional force is that of the glass ribbon. It acts in the opposite direction to the transport direction. From this, if the rotational peripheral speed of the forward rotation cleaning body is made faster than the transport speed of the glass ribbon, the frictional force acting on the glass ribbon by the reverse rotation cleaning body and the friction acting on the glass ribbon by the forward rotation cleaning body. The forces can act in a direction that cancels each other out. Therefore, it is advantageous in suppressing the tension acting on the glass ribbon. Therefore, it becomes easier to clean the front and back surfaces without damaging the glass ribbon.

In the above method, it is preferable that the rotation peripheral speed of the reverse rotation cleaning body and the rotation peripheral speed of the forward rotation cleaning body are the same speed.

In this way, the frictional force acting on the glass ribbon by the reverse rotation cleaning body and the frictional force acting on the glass ribbon by the forward rotation cleaning body preferably cancel each other out, and an excessive tension acts on the glass ribbon. It is possible to avoid it more reliably. As a result, it becomes easier to clean the front and back surfaces without damaging the glass ribbon.

In the above method, it is preferable to clean the surface of the glass ribbon, which is the guaranteed surface, with the reverse rotation cleaning body and the surface which is the non-guaranteed surface with the forward rotating cleaning body.

In order to improve the quality of the glass ribbon that has undergone the cleaning step, it is necessary to make the surface of the glass ribbon, which is the guarantee surface, in a cleaner state in the cleaning process. If the surface to be the guarantee surface is washed with the reverse rotation cleaning body as in this method, the rotation direction of the reverse rotation cleaning body is the glass ribbon when the reverse rotation cleaning body comes into contact with the surface to be the guarantee surface. The direction is opposite to the transport direction. Therefore, it becomes easy to remove the contamination on the guarantee surface, which is advantageous in cleaning the guarantee surface.

In the above method, a plurality of pairs of rotary cleaning bodies are arranged along the transport path of the glass ribbon, and in each of the plurality of pairs, the surface serving as a guarantee surface is cleaned with the reverse rotation cleaning body, and the non-guaranteed surface is cleaned. It is preferable to wash the surface to be cleaned with a forward rotation washing body.

In this way, by arranging a plurality of pairs of rotary cleaning bodies, the opportunity to clean the front and back surfaces of the glass ribbon can be obtained multiple times, and in each of the plurality of pairs, the surface serving as the guarantee surface is rotated in the reverse direction. Since it is cleaned with a cleaning body, it is further advantageous in cleaning the surface that serves as a guarantee surface.

In the above method, the glass ribbon is conveyed in a flat position, and among the pair of rotary cleaning bodies, the position of the rotary cleaning body on the lower side of the glass ribbon is fixed, and the rotary cleaning on the upper side of the glass ribbon is performed. It is preferable to adjust the position of the body along the thickness direction of the glass ribbon. Here, the "flat posture" means a posture in which the front and back surfaces of the glass ribbon are parallel to the horizontal plane, or a posture in which the front and back surfaces of the glass ribbon are inclined within a range of 10 ° or less with respect to the horizontal plane. To do.

In this way, the position of the rotary washer on the upper side is adjusted along the thickness direction of the glass ribbon with respect to the rotary washer on the lower side of the glass ribbon whose position is fixed. The magnitude of the force for pinching the glass ribbon in the thickness direction (hereinafter referred to as the pinching force) can be adjusted by the cleaning body. That is, it is possible to adjust the magnitude of the holding force so that the size is appropriate for cleaning the front and back surfaces without damaging the glass ribbon. Further, since the position of the rotary cleaning body on the lower side is fixed, it is possible to prevent the height position for transporting the glass ribbon from moving up and down when adjusting the magnitude of the holding force.

In the above method, the thickness of the glass ribbon can be in the range of 5 μm to 300 μm.

The above method further includes a winding step of obtaining a glass ribbon by unwinding from the first glass roll and a winding step of winding the glass ribbon that has undergone the cleaning step as a second glass roll. It is preferable to wash the glass ribbon obtained in the process.

In this way, the cleaning process can be performed using the roll-to-roll method. Therefore, it is possible to clean the front and back surfaces of the glass ribbon while saving space.

According to the method for producing a glass film according to the present invention, when the front and back surfaces of the glass ribbon are washed while being conveyed along the longitudinal direction, the front surface of the glass ribbon is not damaged regardless of the thickness of the glass ribbon. The back side can be washed.

It is a side view which shows the outline of the manufacturing method of the glass film which concerns on embodiment of this invention. It is a side view which shows the cleaning process in the manufacturing method of the glass film which concerns on embodiment of this invention. (A) and (b) are side views showing an embodiment of the present invention, and (c) and (d) are side views showing a comparative example. It is a side view for demonstrating the problem in the prior art.

Hereinafter, a method for producing a glass film according to an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, in the method for manufacturing a glass film according to the present embodiment, a roll-to-roll method is used to carry a glass ribbon 1 which is a base of the glass film along a longitudinal direction by a plurality of transport rollers 2. Each step P1 to P6 is executed while being conveyed.

In the present embodiment, the drive roller and the free roller are mixed in the plurality of transfer rollers 2. Further, in the entire length of the transport path of the glass ribbon 1, a transport roller (a pair of transport rollers on the front and back) is not used in which the glass ribbon 1 is sandwiched from both the front and back sides to perform a feed operation.

The glass ribbon 1 is molded to a thickness of 5 μm to 300 μm and has flexibility enough to be curved. Here, according to the method for producing a glass film according to the present embodiment, even if the thickness of the glass ribbon is thin, it is possible to clean the front and back surfaces without damaging the glass ribbon. Therefore, the method for producing a glass film according to the present embodiment is particularly preferably applied when the thickness of the glass ribbon 1 is in the range of 5 μm to 100 μm. Further, in the glass ribbon 1, the front surface 1a (upper surface), which has a relatively small number of contacts with the transport roller 2 during execution of each of the steps P1 to P6, is used as a guarantee surface, and the back surface has a relatively large number of contacts. 1b (lower surface) is a non-guaranteed surface.

The method for producing a glass film according to the present embodiment includes a winding step P1 for unwinding the glass ribbon 1 from the first glass roll 3, and front and back surfaces 1a, while transporting the unwound glass ribbon 1 in a flat position. A cleaning step P2 for cleaning 1b with a cleaning liquid and a brush roller 4 as a rotary cleaning body, a rinsing step P3 for rinsing the front and back surfaces 1a and 1b of the glass ribbon 1 after cleaning with a rinsing solution, and a glass ribbon after rinsing. The draining step P4 for draining the cleaning liquid and the rinsing liquid remaining in 1 by injecting gas, the drying step P5 for drying the drained glass ribbon 1, and the second glass by winding the dried glass ribbon 1. The winding step P6 as the roll 5 is included. The rinsing step P3 does not necessarily have to be performed and may be omitted. Further, if necessary, a high-pressure washing step may be provided between the washing step P2 and the rinsing step P3. In the high-pressure cleaning step, the glass ribbon 1 is cleaned by injecting a high-pressure cleaning liquid toward the front and back surfaces 1a and 1b of the glass ribbon 1.

In the unwinding step P1, the glass ribbon 1 and the strip-shaped protective sheet 6 are separated from the first glass roll 3 which is wound into a roll in a state where the glass ribbon 1 and the flexible strip-shaped protective sheet 6 are overlapped with each other. The two 1 and 6 are separated from each other while being continuously unwound. The separated glass ribbon 1 is sent to the cleaning step P2 on the downstream side of the transport path. On the other hand, the strip-shaped protective sheet 6 after separation is wound into a roll again to form a first sheet roll 7.

In the cleaning step P2, for example, pure water, water mixed with a detergent, or the like can be used as the cleaning liquid. This cleaning liquid is supplied to the front and back surfaces 1a and 1b from a plurality of supply means 8 (for example, a nozzle or the like) arranged along the transport path on each of the front surface 1a side and the back surface 1b side of the glass ribbon 1.

As shown in FIG. 2, the brush rollers 4 used in the cleaning step P2 are arranged so as to be paired on the front surface 1a side and the back surface 1b side of the glass ribbon 1. That is, the pair of brush rollers 4 and 4 sandwich the glass ribbon 1 in the thickness direction. Both brush rollers 4 and 4 have the same radius R and the same length (length along the width direction of the glass ribbon 1). Each brush roller 4 can clean the entire width of the front surface 1a or the back surface 1b of the glass ribbon 1 by rotating around the axis 4a extending along the width direction of the glass ribbon 1. ..

In this embodiment, two pairs of brush rollers 4 and 4 are arranged along the transport path. In the following description, for convenience, the brush rollers 4 and 4 arranged on the upstream side of the transport path of the glass ribbon 1 are referred to as the first pair 9, and the brush rollers 4 and 4 arranged on the downstream side are referred to as the first pair 9. Notated as 2 to 10.

In the brush rollers 4 belonging to the first pair 9 and the second pair 10, the radius R and the length (the length along the width direction of the glass ribbon 1) are the same. That is, in the present embodiment, the radii R and the lengths of the four brush rollers 4 in total are the same. The radii R and lengths of the four brush rollers 4 do not necessarily have to be the same, and may be different.

The brush rollers 4 and 4 do not necessarily have to be arranged in two pairs, and only one pair may be arranged, or three or more pairs may be arranged. However, the upper limit of the logarithm is preferably five pairs. By doing so, it is possible to prevent the transport path of the glass ribbon 1 in the cleaning step P2 from being unreasonably lengthened.

In each of the first pair 9 and the second pair 10, the brush roller 4 arranged on the surface 1a side is a reverse rotation brush roller 4x that rotates in a direction opposite to the transport direction of the glass ribbon 1. On the other hand, the brush roller 4 arranged on the back surface 1b side is a forward-rotating brush roller 4y that rotates in a direction that follows the transport direction of the glass ribbon 1.

Here, the pair of brush rollers 4 and 4 need only have one counter-rotating brush roller 4x and the other forward-rotating brush roller 4y. Therefore, unlike the present embodiment, the back surface of the glass ribbon 1 is used. The reverse rotation brush roller 4x may be arranged on the 1b side, and the forward rotation brush roller 4y may be arranged on the surface 1a side. Further, the surface side on which the reverse rotation brush roller 4x (forward rotation brush roller 4y) is arranged may be different between the first pair 9 and the second pair 10. For example, in the first pair 9, the reverse rotation brush roller 4x is arranged on the front surface 1a side (the forward rotation brush roller 4y is on the back surface 1b side), and in the second pair 10, the reverse rotation brush roller 4x is arranged on the back surface 1b side (forward rotation). The brush roller 4y may be arranged on the surface 1a side (see FIG. 3A for this form).

The rotational peripheral speed is the same between the paired reverse rotating brush roller 4x and the forward rotating brush roller 4y, and the rotational peripheral speed of both is higher than the conveying speed of the glass ribbon 1. ing. Further, between the first pair 9 and the second pair 10, the rotation peripheral speeds of the reverse rotation brush rollers 4x and the forward rotation brush rollers 4y are the same. That is, in the present embodiment, the total rotational peripheral speeds of the four brush rollers 4 are the same.

Here, the rotation peripheral speed does not have to be the same between the paired reverse rotation brush roller 4x and the forward rotation brush roller 4y, and in comparison with the reverse rotation brush roller 4x, the rotation of the forward rotation brush roller 4y The peripheral speed may be high speed or low speed. However, even in this case, it is preferable to make the difference in rotational peripheral speed as small as possible between the two 4x and 4y. Further, the rotational peripheral speeds of both 4x and 4y may be lower than the transport speed of the glass ribbon 1. Further, regarding the rotation peripheral speeds of both 4x and 4y, one rotation peripheral speed is higher than the transfer speed of the glass ribbon 1 and the other rotation peripheral speed is lower than the transfer speed of the glass ribbon 1. You may.

The position of the forward rotating brush roller 4y on the lower side of the glass ribbon 1 is fixed in each of the first pair 9 and the second pair 10. On the other hand, the position of the reverse rotation brush roller 4x on the upper side of the glass ribbon 1 can be adjusted along the thickness direction of the glass ribbon 1.

As a result, the separation distance D from the axis 4a of the reverse rotation brush roller 4x to the surface 1a of the glass ribbon 1 can be changed, and the reverse rotation brush roller 4x is pushed from the front surface 1a side to the back surface 1b side accordingly. It is possible to change the indentation length. Here, the difference between the radius R of the reverse rotation brush roller 4x and the above-mentioned separation distance D is the pushing length. The "radius R of the reverse rotation brush roller 4x" as used herein means a radius in a state in which the outer peripheral portion of the reverse rotation brush roller 4x is not in contact with the glass ribbon 1 and is not deformed. By changing the push-in length, it is possible to adjust the magnitude of the force for sandwiching the glass ribbon 1 in the thickness direction by the pair of brush rollers 4 and 4.

In the rinsing step P3 shown in FIG. 1, for example, pure water or the like can be used as the rinsing liquid. Similar to the cleaning step P2, the rinsing liquid is supplied from a plurality of supply means 11 (for example, a nozzle or the like) arranged along the transport path on each of the front surface 1a side and the back surface 1b side of the glass ribbon 1. Supply to 1a and 1b.

In the liquid draining step P4, on each of the front surface 1a side and the back surface 1b side of the glass ribbon 1 after rinsing, from a plurality of liquid draining means 12 (for example, an air knife or the like) arranged along the transport path, the front and back surfaces 1a , 1b is injected with a gas (for example, air). As a result, the cleaning liquid and the rinsing liquid remaining on the front and back surfaces 1a and 1b of the glass ribbon 1 are removed by the pressure of the gas.

In the drying step P5, on each of the front surface 1a side and the back surface 1b side of the glass ribbon 1 after draining, a plurality of drying means 13 (for example, a dryer or the like) arranged along the transport path are used to cover the glass ribbon 1. The back surfaces 1a and 1b are dried.

In the winding step P6, the dried glass ribbon 1 and the flexible strip-shaped protective sheet 15 unwound from the second sheet roll 14 are superposed and continuously wound in a roll shape. Let it be the second glass roll 5. As described above, the main steps of the glass film manufacturing method according to the present embodiment are completed.

Hereinafter, the main actions and effects of the above glass film manufacturing method will be described.

According to the above method for manufacturing a glass film, the pair of brush rollers 4 and 4 (reverse rotation brush roller 4x and forward rotation brush roller 4y) are rotated in opposite directions during the execution of the cleaning step P2. ing. As a result, the tension acting on the glass ribbon 1 can be suppressed by the amount that both 4x and 4y rotate in opposite directions. As a result, even if the thickness of the glass ribbon 1 is thin, it is possible to prevent the glass ribbon 1 from being damaged. As a result, when cleaning the front and back surfaces 1a and 1b while transporting the glass ribbon 1 along the longitudinal direction, the front and back surfaces 1a and 1b can be cleaned regardless of the thickness of the glass ribbon 1 without damaging it. Cleaning becomes possible.

Here, the method for producing a glass film according to the present invention is not limited to the embodiment described in the above embodiment. For example, in the above embodiment, the brush roller is used as the rotary cleaning body, but in addition to this, a cylindrical sponge such as polyurethane, melamine, PVA, rubber, or sponge can be used as the rotary cleaning body. ..

Further, in the above embodiment, the roll-to-roll method is used to carry the glass ribbon along the longitudinal direction while performing the cleaning step, but the present invention is not limited to this. Absent. For example, a glass ribbon continuously formed by the down draw method (for example, the overflow down draw method) is conveyed in the longitudinal direction, a cleaning step is performed, and then the glass ribbon is wound into a roll to produce a glass roll. It may be the mode to do.

Two conditions (Examples 1 and 2) that serve as examples of the present invention shown in FIGS. 3 (a) and 3 (b) and two conditions that serve as comparative examples shown in FIGS. 3 (c) and 3 (d). Under a total of four conditions (Comparative Example 1 and Comparative Example 2), the cleaning step P2 was executed on the glass ribbon 1 unwound from the glass roll 3, respectively. Then, the cleanliness of the front and back surfaces 1a and 1b of the glass ribbon 1 that had undergone the cleaning step P2 and the damage rate of the glass ribbon 1 that accompanies the steps P1 to P6 were verified.

First, the matters common to all four conditions will be described.

Two pairs of brush rollers 4 and 4 were arranged under each of the four conditions. That is, a total of four brush rollers 4 were used under each condition. The radius R, the length (the length along the width direction of the glass ribbon 1), and the rotational peripheral speed are the same between the four brush rollers 4. Further, the radius R, the length, and the rotational peripheral speed of the brush roller 4 are the same even between the four conditions.

The radius R of each brush roller 4 is 30 mm. The brush roller 4 was rotated at a rotation speed of 300 rpm during the execution of the cleaning step P2. Further, in each of the first pair 9 and the second pair 10, the pushing length of the brush roller 4 on the upper side of the glass ribbon 1 from the front surface 1a side to the back surface 1b side was set to 0.4 mm.

The thickness of the glass ribbon 1 is 50 μm. While transporting the glass ribbon 1 at a transport speed of 0.05 m / s, pure water as a cleaning liquid was supplied to the front and back surfaces 1a and 1b, and the front and back surfaces 1a and 1b were cleaned by the pure water and the brush roller 4. .. Further, in the glass ribbon 1, the front surface 1a (upper surface) of the front and back surfaces 1a and 1b is the guarantee surface.

Next, the matters that differ between the four conditions will be described.

As shown in FIG. 3A, in the first embodiment, the brush roller 4 on the front surface 1a side in the first pair 9 is a reverse rotation brush roller 4x, and the brush roller 4 on the back surface 1b side is a forward rotation brush roller 4y. did. Further, the brush roller 4 on the front surface 1a side in the second pair 10 was designated as a forward rotation brush roller 4y, and the brush roller 4 on the back surface 1b side was designated as a reverse rotation brush roller 4x.

As shown in FIG. 3B, in the second embodiment, the brush roller 4 on the front surface 1a side is the reverse rotation brush roller 4x and the brush roller on the back surface 1b side in each of the first pair 9 and the second pair 10. No. 4 was a forward rotating brush roller 4y. That is, the embodiment of Example 2 is the same as that of the above embodiment.

As shown in FIG. 3C, in Comparative Example 1, both the brush roller 4 on the front surface 1a side and the brush roller 4 on the back surface 1b side are forward-rotating brushes in each of the first pair 9 and the second pair 10. The roller was 4y.

As shown in FIG. 3D, in Comparative Example 2, both the brush roller 4 on the front surface 1a side and the brush roller 4 on the back surface 1b side are reverse-rotating brushes in each of the first pair 9 and the second pair 10. The roller was 4x.

The verification results are shown in [Table 1]. Here, in the verification of cleanliness, the number of particles remaining on the surface 1a (guaranteed surface) of the glass ribbon 1 was measured by a particle counter, and the measurement result was evaluated. In the item of cleanliness, "○" means that the surface 1a was extremely clean, "Δ" means that the surface 1a was clean, and "x" means that the surface 1a was clean. Means that was not clean. Further, in the item of damage rate, "○" means that the damage rate was less than 5%, and "x" means that the damage rate was 5% or more. The "breakage rate" is a ratio (percentage) of the number of glass rolls damaged in steps P1 to P6 to the number of glass rolls provided in steps P1 to P6.

As shown in [Table 1], in Comparative Example 1, it can be seen that the cleanliness of the surface 1a (guaranteed surface) of the glass ribbon 1 is low, and the probability that the glass ribbon 1 is damaged is high. Further, in Comparative Example 2, it can be seen that although the surface 1a has a high degree of cleanliness, the probability of breakage is high. On the other hand, in Examples 1 and 2, it can be seen that the surface 1a is clean and the probability of damage is low.

From the above, according to the method for producing a glass film according to the present invention, when the glass ribbon 1 is conveyed along the longitudinal direction and the front and back surfaces 1a and 1b are washed, the thickness of the glass ribbon 1 is increased or decreased. Regardless, it is presumed that the front and back surfaces 1a and 1b can be cleaned without damaging them.

1 Glass ribbon 1a Front surface 1b Back surface 3 First glass roll 4 Brush roller 4x Reverse rotation brush roller 4y Forward rotation brush roller 5 Second glass roll 9 First pair 10 Second pair P2 Cleaning process

Claims (7)

A method for producing a glass film, which comprises a cleaning step of cleaning the front and back surfaces of the glass ribbon with a pair of rotary cleaning bodies on the front surface side and the back surface side while transporting the glass ribbon along the longitudinal direction.
Of the pair of rotary cleaning bodies, one is a reverse rotation cleaning body that rotates in a direction opposite to the transport direction of the glass ribbon, and the other is a forward rotation cleaning body that rotates in a direction that follows the transport direction of the glass ribbon. In this state, the cleaning step is executed .
A method for producing a glass film, which comprises cleaning the surface of the glass ribbon, which is a guaranteed surface, with the reverse rotation cleaning body and the surface which is not a guarantee surface with the forward rotation cleaning body. .. The method for producing a glass film according to claim 1, wherein the rotation peripheral speed of the forward rotation cleaning body is made higher than the transport speed of the glass ribbon. The method for producing a glass film according to claim 2, wherein the rotation peripheral speed of the reverse rotation cleaning body and the rotation peripheral speed of the forward rotation cleaning body are set to the same speed. A plurality of pairs of rotary cleaning bodies are arranged along the transport path of the glass ribbon, and the pair is arranged.
Claims 1 to 3 characterized in that, in each of the plurality of pairs, the surface serving as the guaranteed surface is washed with the reverse rotation cleaning body, and the surface serving as the non-guaranteed surface is cleaned with the forward rotating cleaning body. The method for producing a glass film according to any one of. While transporting the glass ribbon in a flat position,
Among the pair of rotary cleaning bodies, the position of the rotary cleaning body on the upper side of the glass ribbon is set in the thickness direction of the glass ribbon while the position of the rotary cleaning body on the lower side of the glass ribbon is fixed. The method for producing a glass film according to any one of claims 1 to 4 , wherein the glass film is adjusted accordingly. The method for producing a glass film according to any one of claims 1 to 5 , wherein the thickness of the glass ribbon is in the range of 5 μm to 300 μm. Further including a winding step of obtaining the glass ribbon by unwinding from the first glass roll and a winding step of winding the glass ribbon that has undergone the cleaning step as a second glass roll.
The method for producing a glass film according to any one of claims 1 to 6 , wherein in the cleaning step, the glass ribbon obtained in the unwinding step is washed.

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