TW202134194A - Method for manufacturing glass film - Google Patents

Abstract

This method for manufacturing a glass film includes a direction conversion step for converting a conveyance direction of a glass film G1 by means of a direction conversion device 3 from a vertical direction GY to a horizontal direction GX. The direction conversion step includes a deformation step for deforming the glass film G1 so that the rear surface G1Sb of the glass film assumes a convex shape.

Description

Manufacturing method of glass film

The present invention relates to a method of manufacturing a glass film.

As is well known, in plate glass used in panel displays (panel displays) such as liquid crystal displays and organic electroluminescent (EL) displays, as the demand for weight reduction has increased, thinning has been promoted. Until the development and manufacture of a glass film whose thickness is 300 μm or less, or thinned to 200 μm or less.

The glass film as described above can be manufactured by, for example, a manufacturing method represented by an overflow downdraw method. The manufacturing method includes: a forming step to shape a ribbon-shaped glass film; and an annealing step to The shaped glass film is conveyed in the vertical direction while annealing treatment is performed on one side; the direction conversion step is to convert the conveying direction of the glass film from the vertical direction to the horizontal direction; and the lateral conveying step is to convey the glass film that has been changed in the horizontal direction.

However, when the above-mentioned manufacturing method is adopted, the glass film has the following situation due to its thinness: due to various external factors, during the transportation process in the longitudinal direction, either side of the surface or the back surface is generated. It has a convex shape and a concave shape on the other side, and the direction of the bending deformation (the direction of the unevenness) is exchanged in a short cycle.

As described above, the posture of the glass film during vertical transport is unstable, and the posture of the glass film when introduced to the direction switching step is also not fixed. Due to the posture at this time, stress concentration may occur in the glass film. , Resulting in damage to the glass film. Such damage causes a long-term stop of the production line, and it takes a lot of time to restart the operation of the production line, and therefore becomes a main factor that deteriorates the productivity of the glass film.

Therefore, the applicant has already proposed the manufacturing method described in Patent Document 1 as a solution to the above-mentioned problem. In the manufacturing method, in the lateral conveying step, the lateral conveying portion applies a first propelling force for advancing conveyance in the lateral direction to both ends in the width direction of the glass film by the lateral conveying portion, and a second advancing force is given to the central portion in the width direction. force. By making the first propulsion force greater than the second propulsion force, a portion of the glass film conveyed in the longitudinal direction can be deformed with a convex shape on the back side and a concave shape on the surface side. [Prior Art Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2019-104642

[The problem to be solved by the invention] However, in the above-mentioned manufacturing method, predetermined respective propelling forces are applied to the glass film in the lateral conveying step after the direction changing step. That is, a force is applied to the glass film at a position away from the portion where the glass film is deformed. Therefore, depending on the molding conditions or transportation conditions of the glass film, the effect may not necessarily be sufficient.

In order to appropriately control the deformation of the glass film, it is desirable to apply force to the glass film at a position close to the portion where the deformation occurs.

Therefore, the technical problem of the present invention is to prevent the bending deformation of the glass film in the unfavorable direction during the manufacturing process in the direction switching step.

[Means to solve the problem] The present invention is to solve the problem. The method of manufacturing the glass film of the present invention includes: a forming step of forming a ribbon-shaped glass film by a forming device; and a conveying step of conveying the glass film; The manufacturing method is characterized in that: the conveying step includes: a longitudinal conveying step of conveying the glass film in a longitudinal direction by a longitudinal conveying device; a direction switching step of conveying the glass film in a direction changing device Converting from the longitudinal direction to the lateral direction; and a lateral conveying step in which the glass film is conveyed in the lateral direction by a lateral conveying device; the glass film includes a surface that becomes an upper surface in the lateral conveying step , And a back surface located on the opposite side of the surface, the direction conversion step includes a deforming step, and the deforming step deforms the glass film so that the back surface is convex.

According to this configuration, the step of changing the direction includes the step of deforming the glass film so that the back surface is convex, whereby the deformation of the glass film can be reliably controlled. Therefore, it is possible to prevent poor bending deformation of the glass film in the direction switching step.

In this method, it may also be that the direction conversion device includes a deforming device that deforms the glass film by using airflow, so that the back surface is convex.

In this method, it may also be that: the deformation device includes a spraying part that sprays gas, and the gas flow is pressed against the surface of the glass film to deform the glass film, so that the glass film is deformed. The back surface is convex, and the air flow is generated by the gas sprayed from the spray part.

Alternatively, the direction changing device may include: a restricting roller arranged below the longitudinal conveying device and in contact with the surface of the glass film; and a roller conveyor (roller conveyer) arranged at The position below the roller and supports the back surface; the spray attachment part is arranged between the restricting roller and the roller conveyor.

According to the above configuration, in a state where the position of the glass film is restricted by the restriction roller, the glass film is deformed by the airflow of the spray part, and the deformation of the glass film can be reliably and accurately controlled.

The deformation device may also include an air flow adjusting part for adjusting the air flow. By adjusting the air flow from the air flow generating part by the air flow adjusting part, the glass film can be appropriately deformed according to the size of the glass film or the conveying conditions.

The spray part may also make the air flow abut against the center part in the width direction of the surface of the glass film.

It may also be that: the deforming device includes a spraying part for injecting gas, and by making the air flow to hit the back surface of the glass film, the glass film is deformed so that the back surface is convex The air flow is generated by the gas sprayed from the spray part.

At this time, the spray part may also make the air flow abut the width direction end of the back surface of the glass film.

In this method, it may be that: the deformation device includes a suction part that sucks gas, and the suction part deforms the glass film by sucking air on the back side of the glass film , So that the back surface is convex.

At this time, the said suction part may also suck the air of the width direction center part side of the said back surface of the said glass film.

In this method, it may be that: the lateral conveying step includes the following steps, that is, by the lateral conveying device, the both ends of the glass film in the width direction are given to push the conveying in the lateral direction. The first propelling force of the glass film, and a second propelling force for advancing conveyance in the lateral direction is given to the center portion in the width direction of the glass film, and the first propelling force is greater than the second propelling force.

[Effects of the invention] According to the present invention, it is possible to prevent bending deformation of the glass film in a poor direction during the manufacturing process in the direction switching step.

Hereinafter, the mode for implementing the present invention will be described with reference to the drawings. 1 to 5 show the first embodiment of the method of manufacturing the glass film of the present invention.

1 and 2 show the overall structure of a glass film (glass roll) manufacturing apparatus used in this method. The manufacturing device 1 includes: a forming device 2, which uses molten glass to shape a ribbon-shaped base material glass film (glass ribbon) G1; a direction changing device 3, which changes the traveling direction of the base material glass film G1; and a lateral conveying device 4 , The base material glass film G1 is conveyed in the horizontal direction GX; and the winding device 5 removes the excess part of the width direction end Ga and the width direction end Gb of the base material glass film G1, and uses the width direction center Gc as the product glass film G2 is wound to form a glass roll GR.

In this specification, the "horizontal direction" is a concept that includes a horizontal direction and a direction at a fixed angle with respect to the horizontal direction. The "longitudinal direction" refers to a concept including a vertical direction and a direction at a fixed angle with respect to the vertical direction. The "width direction end" (Ga, Gb) of the base material glass film G1 refers to the width direction dimension from the width direction ends of the base material glass film G1 to the entire width direction of the base material glass film G1 The area from 5% to 10%. The "width direction center portion" (Gc) of the base material glass film G1 refers to a region other than the width direction end portions of the base material glass film G1.

The thickness of the product glass film G2 is set to 300 μm or less, preferably 100 μm or less. The product glass film G2 includes the first main surface G2Sa which becomes the upper surface during the conveyance by the lateral conveying device 4, and the second main surface G2Sb located on the opposite side of the first main surface G2Sa. Hereinafter, in the base material glass film G1, the surface corresponding to the first main surface G2Sa of the product glass film G2 (the surface that may become the upper surface during conveyance by the lateral conveying device 4) is referred to as the surface G1Sa. The surface corresponding to the second main surface G2Sb of the product glass film G2 (the surface located on the opposite side of the surface G1Sa and which may become the lower surface during the conveyance by the lateral conveying device 4) is called the back surface G1Sb. When high-quality film formation or the like is performed on the first main surface G2Sa, the first main surface G2Sa becomes a quality assurance surface. Furthermore, at both ends in the width direction of the base material glass film G1, ear parts Gd having a larger thickness than other parts are formed.

As shown in Fig. 1, the forming device 2 includes: a forming body 6 that is approximately wedge-shaped in cross-section, and an overflow groove 6a is formed at the upper end; The molten glass overflowing from the molded body 6 is clamped on both sides of the surface and the back surface;

The forming apparatus 2 causes the molten glass overflowing from the upper side of the overflow groove 6a of the molded body 6 to flow down respectively along both side surfaces, and merge them at the lower end to shape the film-like molten glass. The draw roll 7 restricts the width direction shrinkage of the molten glass to make it a base material glass film G1 of a predetermined width.

The annealing furnace 8 is used to perform annealing treatment (de-strain treatment) on the base material glass film G1. The annealing furnace 8 includes annealing furnace rolls 8a arranged in multiple layers in the vertical direction. Each annealing furnace roll 8a includes a roll pair that sandwiches the base material glass film G1 from both sides of the front and back surfaces. The annealing furnace roll 8a functions as a longitudinal conveying device, and conveys the base material glass film G1 formed by the forming device 2 in the longitudinal direction GY in the annealing furnace 8.

Below the annealing furnace 8 is provided a support roll 9 which clamps the base material glass film G1 from both sides of the front and back. Between the support roll 9 and the edge-drawing roll 7 or between the support roll 9 and any annealing furnace roll 8a, the tension for promoting the thickness reduction of the base material glass film G1 is given.

The direction conversion device 3 converts the traveling direction of the base material glass film G1 from the vertical direction GY to the horizontal direction GX. The direction changing device 3 is installed at a position below the annealing furnace 8 and the support roll 9.

As shown in FIGS. 3 and 4, the direction changing device 3 includes: a restricting roller 10a and a restricting roller 10b, which abut the surface G1Sa of the base material glass film G1; a deforming device 11, which deforms the base material glass film G1; and a roller type The conveyor 12 is installed below the restriction roller 10 a, the restriction roller 10 b, and the deforming device 11.

The restriction roller 10a and the restriction roller 10b are in contact with the end Ga and the end Gb of the base material glass film G1 from the surface G1Sa side of the base material glass film G1. The restriction roller 10a and the restriction roller 10b include a first restriction roller 10a that is in contact with one end Ga in the width direction of the base material glass film G1, and a second restriction roller 10a that is in contact with the other end Gb of the base material glass film G1 in the width direction. Restriction roller 10b.

The deforming device 11 is arranged between the restriction roller 10 a, the restriction roller 10 b, and the roller conveyor 12 in the longitudinal direction GY. The deforming device 11 includes an airflow generating part 13 that generates an airflow A with respect to the base material glass film G1, and an airflow adjusting part 14 that adjusts the airflow A from the airflow generating part 13.

The airflow generating portion 13 is arranged to face the surface G1Sa of the base material glass film G1. The airflow generating part 13 includes a spraying part 15 that sprays gas to the base material glass film G1. The spray part 15 is configured in a tube shape and allows gas to circulate inside. The spray part 15 includes a plurality of spray ports 16 that spray gas to the surface G1Sa of the base material glass film G1.

As shown in FIG. 3, the injection port 16 is configured as a circular hole formed in the middle of the spray part 15, but the shape of the injection port 16 is not limited to this embodiment. As shown in FIG. 4, the injection port 16 injects gas so that the airflow A (represented by a solid line) hits the surface G1Sa of the base material glass film G1 at a right angle. It is not limited to this, and as shown by a two-dot chain line in FIG. 4, the injection port 16 may inject gas so that the airflow A may face diagonally downward.

The airflow adjusting unit 14 includes a plurality of (for example, two) shielding members 17 a, shielding members 17 b, and a moving mechanism (illustration omitted) that moves the shielding members 17 a and the shielding members 17 b. The shielding member 17a and the shielding member 17b include elongated plate members, but are not limited to the above-mentioned shapes. The shielding member 17a and the shielding member 17b are arranged between the airflow generating portion 13 and the surface G1Sa of the base material glass film G1.

The two shielding members 17 a and 17 b are arranged along the longitudinal direction of the spray portion 15 of the air flow generating portion 13. The moving mechanism is configured to move each shielding member 17a and shielding member 17b in the longitudinal direction of the spray part 15 (the width direction of the base material glass film G1).

As shown in FIG. 3, the shielding member 17a and the shielding member 17b of the airflow adjustment part 14 shield a part of the injection ports 16 of the airflow generating part 13, and expose the remaining injection ports 16 with respect to the base material glass film G1 without shielding. By changing the position of the shielding member 17a and the shielding member 17b by a moving mechanism, the number of the ejection ports 16 to be shielded is changed. Thereby, the airflow adjusting part 14 adjusts the intensity and range of the airflow A from the airflow generating part 13 to the base material glass film G1.

The roller conveyor 12 includes a plurality of guide rollers 12a that support the back surface G1Sb of the base material glass film G1. Each guide roller 12a is arrange|positioned at a predetermined position so that it may draw a substantially circular arc-shaped trajectory, and convey the base material glass film G1.

The lateral conveying device 4 is arranged on the downstream side of the direction changing device 3 in the traveling direction of the base material glass film G1. The lateral conveying device 4 includes a first conveying device 18, a second conveying device 19, and a third conveying device 20. The first conveying device 18 is arranged on the downstream side of the direction changing device 3. The second conveying device 19 is arranged on the downstream side of the first conveying device 18. The third conveying device 20 is arranged on the downstream side of the second conveying device 19.

The first conveying device 18 includes, for example, a suspended belt conveyor. As shown in FIG. 5, the first conveying device 18 includes an endless conveyor belt 21 and a driving roller 22 that drives the conveyor belt 21.

In the conveyor belt 21, a plurality of holes 23 are formed. The conveyor belt 21 injects gas V from the holes 23 from a gas supply device (not shown), which is arranged on the inner circumference of the conveyor belt 21. The gas V injected from the hole 23 can suspend a part of the base material glass film G1.

On both sides in the width direction of the outer surface of the conveyor belt 21, tape 24 is adhered in a loop shape. Therefore, the widthwise end portions Ga and Gb of the base material glass film G1 introduced into the first conveying device 18 are in contact with these tapes 24. Among the plurality of holes 23 provided in the conveyor belt 21, the holes 23 provided on both sides of the conveyor belt 21 in the width direction are blocked by the tape 24. Therefore, the buoyancy generated by the injection of the supply gas V at the widthwise end portions Ga and Gb of the base material glass film G1 in contact with the tape 24 does not act.

The second conveying device 19 includes, for example, a belt conveyor. The second conveying device 19 includes an endless conveyor belt 25 and a cutting device 26 that cuts the width direction end Ga and the width direction end Gb of the base material glass film G1 as the non-product portion Ge.

The conveyor belt 25 conveys the base material glass film G1 to the midway portion of the conveyor belt 25, where the product glass film G2 formed by cutting the base material glass film G1 and the non-product portion Ge Transport to the downstream side.

The cutting device 26 cuts the base material glass film G1 by, for example, laser cutting, but it is not limited to the cutting method described above. The cutting device 26 includes a pair of laser irradiation devices 26a and a pair of cooling devices 26b arranged on the downstream side of the laser irradiation device 26a. After the cutting device 26 irradiates laser light from each laser irradiation device 26a to a predetermined portion of the conveyed base material glass film G1 to heat it, the cutting device 26 releases a refrigerant from the cooling device 26b to cool the heated portion.

The third conveying device 20 includes, for example, a suction conveyor. The third conveying device 20 conveys the product glass film G2 to the downstream side in a fixed and held state.

The third conveying device 20 includes a conveyor belt 27 capable of sucking the product glass film G2. The conveyor belt 27 is formed with a plurality of suction holes (not shown) penetrating the conveyor belt 27 in the thickness direction. In addition, on the inner peripheral side of the conveyor belt 27, a negative pressure generating device (not shown) connected to a vacuum pump or the like is arranged. The negative pressure generating device generates negative pressure for adsorbing the product glass film G2 through the adsorption holes.

Therefore, the surface of the conveyor belt 27 fixes and holds the second main surface G2Sb of the product glass film G2 by suction. The product glass film G2 in the state adsorbed to the conveyor belt 27 is conveyed to the downstream side of the conveying path at the same conveying speed as the conveying speed of the conveyor belt 27.

The product glass film G2 is fixed and held by the third conveying device 20, and is conveyed in a relaxed state in the area between the second conveying device 19 and the third conveying device 20, and is wound on the third conveying device 20. Between the apparatuses 5, they are conveyed in the state which gave tension|tensile_strength to the longitudinal direction.

The winding device 5 is provided on the downstream side of the third conveying device 20. The winding device 5 includes a winding roller 28, a motor (not shown) for rotationally driving the winding roller 28, and a protection sheet supply unit 29 that supplies the protection sheet PS to the winding roller 28. The winding device 5 superimposes the protective sheet PS and the product glass film G2 from the protective sheet supply part 29, and while rotating the winding roller 28 by a motor, winds the product glass film G2 into a roll shape. The rolled product glass film G2 is configured as a glass roll GR.

Hereinafter, a method of manufacturing the glass film G1 and the glass film G2 (glass reel GR) using the manufacturing apparatus 1 of the above-mentioned structure will be described. The method includes: a forming step to shape the base material glass film G1; a transport step to transport each glass film G1 and glass film G2; and a winding step to wind the product glass film G2 into a roll shape.

In the forming step, the molten glass overflowing from the upper side of the overflow groove 6a of the formed body 6 in the forming apparatus 2 is caused to flow down respectively along both side surfaces, and the molten glass is merged at the lower end to form the molten glass into a film shape. At this time, the edging roll 7 restricts the width direction shrinkage of the molten glass and makes it the base material glass film G1 of a predetermined width. After that, the base material glass film G1 is annealed in the annealing furnace 8 (annealing step). The base material glass film G1 is formed to a predetermined thickness by the action of the tension imparted by the support roller 9.

The conveying steps include: a longitudinal conveying step, conveying the base glass film G1 along the longitudinal direction GY; a direction switching step, changing the conveying direction of the base glass film G1 from the longitudinal direction GY to the lateral direction GX; and a lateral conveying step along the lateral direction GX transports base material glass film G1.

In the longitudinal conveyance step, while annealing the base material glass film G1, the base material glass film G1 is conveyed in the longitudinal direction GY (downward) by the annealing furnace roll 8a as a longitudinal conveying device.

In the direction changing step, the direction changing device 3 converts the conveying direction of the base material glass film G1 conveyed from the annealing furnace 8 from the longitudinal direction GY to the lateral direction GX. The direction conversion step includes a deformation step that deforms a part of the base material glass film G1 immediately before the direction conversion.

In the deformation step, each of the restriction roller 10a and the restriction roller 10b is in contact with the width direction end Ga and the width direction end Gb of the surface G1Sa of the base material glass film G1. Thereby, the position of the base material glass film G1 can be restricted. In addition, in the deformation step, gas is injected from the airflow generating portion 13 (spraying portion 15) of the deforming device 11 to generate the airflow A from the deforming device 11 to the surface G1Sa of the base material glass film G1. The air flow A hits the center part Gc in the width direction of the surface G1Sa of the base material glass film G1. The width direction center Gc of the base material glass film G1 is pressed by the air flow A, and as shown by the two-dot chain line in FIG. Concave deformation. Along with this deformation, the back surface G1Sb of the center portion Gc in the width direction of the base material glass film G1 is deformed convexly.

After that, the base material glass film G1 passes through the deformation device 11 and reaches the roller conveyor 12. The base material glass film G1 is guided in a state where the back surface G1Sb is supported by each guide roller 12a of the roller conveyor 12, thereby changing the traveling direction from the vertical direction GY to the horizontal direction GX.

In the lateral conveyance step, the first conveying device 18 and the second conveying device 19 convey the base material glass film G1 passing through the direction changing device 3, and the second conveying device 19 and the third conveying device 20 convey the product glass film G2.

As shown in FIG. 5, the 1st conveyance apparatus 18 provides the 1st propulsion force F1 which promotes conveyance in the lateral direction GX to the width direction both ends Ga and Gb of the base material glass film G1. In addition, the first conveying device 18 applies a second propelling force F2 to the central portion Gc in the width direction of the base material glass film G1.

When the base material glass film G1 is introduced into the first conveying device 18, the gas V is injected and supplied to the base material glass film G1 on the conveyor belt 21 through the hole 23. Thereby, the width direction center part Gc of the base material glass film G1 is in the state suspended from the conveyor belt 21. At this time, the widthwise end portions Ga and Gb of the base material glass film G1 including the ear portion Gd are not suspended, but are supported in a state of being in contact with the tape 24 of the first conveying device 18. By driving the conveyor belt 21 of the first conveying device 18, the base material glass film G1 is conveyed to the second conveying device 19.

In the lateral conveyance step, the base material glass film G1 can be conveyed in the lateral direction in a flat posture that does not bend as a whole, and the first conveying device 18 is used to apply the widthwise ends Ga and Gb of the base material glass film G1. The base material glass film G1 is conveyed in the lateral direction GX while having a corresponding magnitude of the conveyance propulsion force in the lateral direction (first propulsion force F1). In addition, the second propelling force F2 imparted to the central portion Gc of the base material glass film G1 in the width direction by the first conveying device 18 is substantially zero, so that the first propulsive force F1 can be reliably made larger than the second propulsion力 F2.

As described above, by enlarging the difference between the second propulsion force F2 and the first propulsion force F1, it is possible to positively produce a concave surface G1Sa with respect to the portion of the base material glass film G1 on the upstream side that is conveyed in the longitudinal direction GY. Shape, the back surface G1Sb is convexly curved and deformed. That is, the first conveying device 18 plays an auxiliary role to promote the deformation device 11 to appropriately deform the base material glass film G1.

The lateral conveyance step includes a cutting step of dividing the base material glass film G1 into the product glass film G2 and the non-product portion Ge, and a discarding step of discarding the non-product portion Ge.

In the cutting step, the base material glass film G1 conveyed from the first conveying device 18 is conveyed to the downstream side by the conveyor belt 25 of the second conveying device 19. During the transportation, the cutting device 26 irradiates a part of the base material glass film G1 with laser light from the laser irradiation device 26a to heat it. Thereafter, the cooling device 26b is used to spray the refrigerant on the heated part. As a result, thermal stress is generated in the base material glass film G1. In the base material glass film G1, an initial crack is formed in advance, and the cutting device 26 develops the crack by thermal stress. Thereby, the base material glass film G1 is used to form the product glass film G2 and the non-product part Ge.

In the discarding step, the non-product part Ge is conveyed to the downstream side by the second conveying device 19. After that, the conveyance path of the non-product part Ge self-product glass film G2 is detached downward and cut to a length suitable for disposal.

In the winding step, the protective sheet PS is supplied to the product glass film G2 from the protective sheet supply part 29, and the product glass film conveyed by the third conveying device 20 is transferred by the winding roller 28 of the winding device 5 G2 is wound into a roll. The glass roll GR is completed by winding the product glass film G2 of a predetermined length by the winding roller 28.

According to the method of manufacturing the glass film of the present embodiment described above, in the direction changing step, the airflow A of the deforming device 11 is brought into contact with the surface G1Sa of the base material glass film G1, so that the base material glass film G1 Deform so that the back surface G1Sb side becomes convex. Therefore, it is possible to prevent the occurrence of undesirable deformation in which the surface G1Sa of the base material glass film G1 is convex.

Fig. 6 shows a second embodiment of the glass film manufacturing method of the present invention. The airflow generating portion 13 of the deforming device 11 of the present embodiment includes two spraying portions (a first spraying portion 15a and a second spraying portion 15b).

Each spraying portion 15a and spraying portion 15b can spray a gas on the surface G1Sa of the base material glass film G1 without passing through the airflow adjusting portion 14 in the first embodiment. In this embodiment, the airflow A is not adjusted, and the airflow A is directly hit to an appropriate position (the center part Gc in the width direction) to deform the base glass film G1, thereby making the back surface G1Sb of the base glass film G1 Deformed convexly. Each spraying part 15a and spraying part 15b can also be comprised so that the position may be changed by a moving mechanism.

7 and 8 show the third embodiment of the method of manufacturing the glass film of the present invention. The airflow generating part 13 of the deforming device 11 of this embodiment is arrange|positioned so that it may oppose the back surface G1Sb of the base material glass film G1.

The airflow generating part 13 includes two spraying parts (a first spraying part 15a and a second spraying part 15b). The first spray part 15a is arranged to face one end Ga in the width direction of the base material glass film G1. The second spray part 15b is arranged to face the other end Gb in the width direction of the base material glass film G1.

In this embodiment, in the direction switching step, the air flow A sprayed by the first spraying portion 15a is made to abut the one end Ga of the base glass film G1 from the back surface G1Sb side of the base glass film G1. In addition, the air flow A sprayed by the second spraying portion 15b is made to abut against the other end Gb of the base glass film G1 from the back surface G1Sb side of the base glass film G1.

Each end Ga and end Gb of the base material glass film G1 are pressed by the airflow A, and are deformed in a manner separated from the deforming device 11 as shown by a two-dot chain line in FIG. 8. Since the center part Gc of the width direction of the base material glass film G1 is not pressed by the airflow A, it hardly deforms. Due to the deformation of the end Ga and the end Gb of the base material glass film G1 as described above, the base material glass film G1 is deformed such that the back surface G1Sb is convex and the surface G1Sa is concave.

9 and 10 show the fourth embodiment of the method of manufacturing the glass film of the present invention. The airflow generating part 13 of the deforming device 11 of this embodiment is arrange|positioned so that it may oppose the back surface G1Sb of the base material glass film G1. The airflow generating part 13 includes a suction part 30 that sucks gas. The suction part 30 includes a suction port 31 that sucks in surrounding air.

As shown in FIG. 10, in the direction switching step, the air flow generating unit 13 sucks the back G1Sb side of the base material glass film G1, that is, the width direction center Gc side of the base material glass film G1 by the suction unit 30 The surrounding air. Thereby, the air flow A from the base material glass film G1 to the suction part 30 is generated.

The center part Gc in the width direction of the base material glass film G1 is sucked to the suction part 30 side by the air flow A. Therefore, the base material glass film G1 is deformed such that the back surface G1Sb is convex and the surface G1Sa is concave as shown by the two-dot chain line in FIG. 10.

In addition, this invention is not limited to the structure of the said embodiment, and it is not limited to the said effect. Various changes can be made to the present invention within the scope not departing from the gist of the present invention.

In the above-mentioned embodiment, the step of applying the propulsion force F1 and the propulsion force F2 that can deform the base material glass film G1 by the first conveying device 18 has been exemplified, but the present invention is not limited to the above-mentioned structure. The first conveying device 18 may also include a conveying device other than a suspended conveyor. As the first conveying device 18, a conventional belt conveyor that imparts a single propulsion force can also be used.

In the above-mentioned embodiment, the form in which the product glass film G2 is wound by the winding roller 28 to produce the glass roll GR has been described, but it is not limited to the above-mentioned form. For example, it may be a form which replaces the winding roller 28 and installs a width direction cutting device which is not shown in figure, and manufactures a single-piece glass film.

The above-mentioned embodiments may be appropriately combined. For example, the first embodiment and the third embodiment may be combined. It is also possible to combine the second embodiment and the third embodiment. It is also possible to combine the third embodiment and the fourth embodiment. It is also possible to combine the first embodiment, the third embodiment, and the fourth embodiment. It is also possible to combine the second embodiment, the third embodiment, and the fourth embodiment.

1: Manufacturing device 2: Forming device 3: Direction conversion device 4: Horizontal handling device 5: Winding device 6: forming body 6a: Overflow trough 7: Side-drawing roller 8: Annealing furnace 8a: Annealing furnace roll (longitudinal conveying device) 9: Support roller 10a: The first restriction roller 10b: The second limit roller 11: Deformation device 12: Roller conveyor 12a: guide roller 13: Airflow generating part 14: Airflow adjustment department 15: Spray attachment 15a: The first spray attachment 15b: The second spray attachment part 16: Jet 17a, 17b: Shading member 18: The first transport device 19: The second conveying device 20: The third conveying device 21, 25, 27: conveyor belt 22: drive roller 23: Hole 24: Tape 26: Cutting device 26a: Laser irradiation device 26b: Cooling device 28: Winding roller 29: Protect the sheet supply part 30: Suction section 31: suction port A: Airflow F1: First propulsion F2: Second propulsion G1: Base material glass film G1Sa: The surface of the base material glass film G1Sb: The back of the base material glass film G2: Product glass film G2Sa: the first major aspect G2Sb: Second main surface Ga, Gb: the width direction end of the base material glass film Gc: The central part of the base material glass film in the width direction Gd: Ear Ge: Non-Products Department GR: Glass reel GX: Horizontal direction GY: longitudinal direction PS: Protective sheet V: gas

Fig. 1 is a side view showing the glass film manufacturing apparatus of the first embodiment. Fig. 2 is a cross-sectional view taken along the line of arrow II-II in Fig. 1. Fig. 3 is a rear view of the direction changing device. Fig. 4 is a cross-sectional view taken along the line of arrow IV-IV in Fig. 3. Fig. 5 is a perspective view of a first conveying device of the lateral conveying device. Fig. 6 is a rear view of the direction changing device of the second embodiment. Fig. 7 is a rear view of the direction changing device of the third embodiment. Fig. 8 is a side view of Fig. 7 on the line of arrow VIII-VIII. Fig. 9 is a rear view of the direction changing device of the fourth embodiment. Fig. 10 is a cross-sectional view taken along the line of arrow X-X in Fig. 9.

1: Manufacturing device

2: Forming device

3: Direction conversion device

4: Horizontal handling device

5: Winding device

6: forming body

6a: Overflow trough

7: Side-drawing roller

8: Annealing furnace

8a: Annealing furnace roll (longitudinal conveying device)

9: Support roller

10a: The first restriction roller

10b: The second limit roller

11: Deformation device

12: Roller conveyor

12a: guide roller

13: Airflow generating part

14: Airflow adjustment department

18: The first transport device

19: The second conveying device

20: The third conveying device

21, 25, 27: conveyor belt

26: Cutting device

26a: Laser irradiation device

26b: Cooling device

28: Winding roller

29: Protect the sheet supply part

G1: Base material glass film

G1Sa: The surface of the base material glass film

G1Sb: The back of the base material glass film

G2: Product glass film

G2Sa: the first major aspect

G2Sb: Second main surface

Ge: Non-Products Department

GR: Glass reel

GX: Horizontal direction

GY: longitudinal direction

PS: Protective sheet

V: gas

Claims (11)

A method of manufacturing a glass film, comprising: a forming step of forming a ribbon-shaped glass film by a forming device; and a transporting step of transporting the glass film; the method of manufacturing the glass film is characterized by: The conveying step includes: a longitudinal conveying step of conveying the glass film in a longitudinal direction by a longitudinal conveying device; a direction changing step of changing the conveying direction of the glass film from the longitudinal direction by a direction changing device Is a lateral direction; and a lateral conveying step in which the glass film is conveyed in the lateral direction by a lateral conveying device; The glass film includes a surface that becomes an upper surface in the lateral transport step, and a back surface located on the opposite side of the surface, The direction conversion step includes a deforming step that deforms the glass film so that the back surface is convex. The method of manufacturing a glass film according to claim 1, wherein the direction changing device includes a deforming device that deforms the glass film by using airflow so that the back surface is convex. The method for manufacturing a glass film according to claim 2, wherein the deforming device includes a spraying part that sprays gas, By causing the airflow to hit the surface of the glass film, the glass film is deformed so that the back surface is convex, and the airflow is sprayed from the spray part The gas is produced. The method of manufacturing a glass film according to claim 3, wherein the direction changing device includes: a restricting roller arranged below the longitudinal conveying device and in contact with the surface of the glass film; and roller conveying The machine is arranged at the position below the restriction roller and supports the back surface; The spray attachment part is arranged between the restriction roller and the roller conveyor. The method for manufacturing a glass film according to claim 3 or claim 4, wherein the deforming device includes an air flow adjusting part that adjusts the air flow. The method for manufacturing a glass film according to any one of claims 3 to 5, wherein the spraying part causes the airflow to abut the center portion in the width direction of the surface of the glass film. The method for manufacturing a glass film according to claim 2, wherein the deforming device includes a spraying part that sprays gas, By making the air flow hit the back surface of the glass film, the glass film is deformed so that the back surface is convex, and the air flow is sprayed from the spray part The gas is produced. The method of manufacturing a glass film according to claim 7, wherein the spray part makes the air flow abut the width direction end of the back surface of the glass film. The method of manufacturing a glass film according to claim 2, wherein the deforming device includes a suction part that sucks gas, The suction part deforms the glass film by sucking air on the back side of the glass film so that the back surface is convex. The method of manufacturing a glass film according to claim 9, wherein the suction unit sucks air on the side of the center portion in the width direction of the back surface of the glass film. The method for manufacturing a glass film according to any one of claims 1 to 10, wherein the lateral conveying step includes the following steps: by the lateral conveying device, the width direction of the glass film is An end portion is provided with a first propelling force for advancing conveyance in the lateral direction, and a second propelling force for advancing conveyance in the lateral direction is given to the center portion in the width direction of the glass film, The first propulsion force is greater than the second propulsion force.

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