KR20140039173A - Glass roll manufacturing method - Google Patents

Abstract

The protective film F1 is laminated | stacked on the glass film G at the downstream end of the conveyance path | route of the shaping | molding process S1 which conveys, and continuously shape | molds glass film G by the down-draw method, and roll shape The glass film at the downstream end of the conveying path while conveying to the downstream side while unwinding the glass film G from the temporary winding process S3 and the original glass roll 14 which are wound up and manufacturing the original glass roll 14 This winding-up process (S4) which superimposes protective film F2 on (G), winds up again in roll shape, and manufactures the glass roll 16 is included. And the tension | tensile_strength of the winding direction which acts on the glass film G in this winding process S4 is made larger than temporary winding process S3.

Description

Glass roll manufacturing method {GLASS ROLL MANUFACTURING METHOD}

This invention relates to the improvement of the manufacturing technique of the glass roll which wound the glass film shape | molded by the down-draw method in roll shape.

As is already known, the flat panel display (FPD) represented by a liquid crystal display, a plasma display, an organic electroluminescent display, etc. is the mainstream in the video display apparatus in recent years. As a board | substrate of these FPDs, a glass substrate is used in order to ensure various required characteristics, such as airtightness, flatness, heat resistance, light transmittance, and insulation. It is a fact that the glass substrate used for the said FPD walks in thin-walled work from a viewpoint of weight reduction. In particular, in FPDs, such as an organic electroluminescent display, since the use which bends and uses a display screen is also considered, thinning of a glass substrate is calculated | required in order to provide flexibility.

In addition, the organic EL is used as a planar light source such as a light source for indoor lighting by emitting light with only a single color (for example, white) without causing the three primary colors to be flickered by the TFT as in a display. The lighting apparatus of organic EL has the advantage that when a glass substrate is flexible, a light emitting surface can be freely deform | transformed and the use usage is greatly extended. Therefore, thinning is promoted from the viewpoint of ensuring sufficient flexibility even in the glass substrate used for this kind of lighting apparatus.

In addition, since the touch panel rubs the surface with a human finger or the like and operates the glass panel, a glass substrate is often used to secure the fastness of the surface. With the spread of mobile terminals equipped with this kind of touch panel, a thin plate is required for light weight in the glass substrate for touch panels.

And the glass film which thinned to the film shape (for example, thickness of 300 micrometers or less) is accommodated by accommodating such request | requirement of such thinning, and is developing. Since this glass film has moderate flexibility, it overlaps with a protective film, is wound up in roll shape around a core together, and may be accommodated in what is called a glass roll (for example, refer patent document 1). In this case, since the accommodation space of a glass film will become largely small, the transportation efficiency can be improved. Moreover, various processes, such as cutting | disconnection and film-forming, can be performed continuously with respect to the glass film unwound from the glass of an upstream by the roll to roll apparatus, and it becomes possible to aim at the significant improvement of productive efficiency.

Japanese Patent Publication No. 2010-132350

By the way, a glass film is shape | molded by the downdraw method in many cases. Therefore, when it is going to accommodate in the state of a glass roll, it is necessary to wind up the glass film continuously shape | molded from the molded object which performs the down-draw method directly around the core.

In this case, however, if the tension is excessively applied to the glass film during winding (for example, about 100 N for a glass film having a width of 1 m), the excessive tension acts on the glass film in the softened state near the molded body, and the thickness of the glass film is increased. A fatal problem arises that it becomes unstable, curvature or curvature occurs or, in some cases, heat insulation from below the molded body.

Therefore, it is difficult practically to wind up by applying sufficient tension to a glass film, for example, the winding glass film will move to a width direction afterwards, and winding shift will arise easily. In addition, if the glass film is not wound by applying an appropriate tension, the glass film may rise from the core in the state of the glass roll, and an uneven gap may be formed between the glass films. And when winding shift and float (diameter gap) generate | occur | produce in the glass film in this way, a glass film will become easy to be damaged and handling becomes very troublesome. In addition, in this case, since the glass film is wound up irregularly, the appearance of the glass roll is also very bad, which may also be a factor for lowering the product value.

In view of the above circumstances, the present invention, when accommodating the glass film continuously formed by the down-draw method in the state of the glass roll to reduce the occurrence of the winding shift and float in the glass film contained in the glass roll as possible Let it be technical problem.

The 1st invention created in order to solve the said subject is the shaping | molding process which conveys a glass film to a downstream side continuously by the shaping | molding apparatus which implements a downdraw method, and the said glass film in the downstream end of the conveyance path | route of the said molding process. 1st winding process which rolls up a 1st protective film in a roll shape, and manufactures a round glass roll, and conveys to the downstream side, unwinding the said glass film from the said raw glass roll, and downstream of the conveyance path | route A second winding step of manufacturing a glass roll by stacking a second protective film on the glass film again and rolling in a roll shape, wherein the tension in the winding direction acting on the glass film in the second winding step It characterized by making it larger than the tension acting on the said glass film in 1 winding process.

According to this method, the glass film wound up in the 1st winding process is wound up again in the state which made greater tension act on the winding direction (the conveyance direction of a glass film) than a 1st winding process in a 2nd winding process. Therefore, in the 1st winding process which winds up the glass film shape | molded by the shaping | molding apparatus directly, it is not necessary to apply excessive tension to a glass film and wind up. In other words, in the first winding step, the tension may be applied to the glass film within a range that does not adversely affect the thickness of the glass film formed by the molding apparatus, such as unfairly varying. Even if it arises, it can correct in a 2nd winding process. That is, in the second winding process, even if a large tension is applied to the glass film, there is no adverse effect on the molding of the glass film. Thus, the glass film is wound again while giving the glass film sufficient tension such that winding shift or rise does not occur. Glass rolls can be produced.

It is preferable to make the tension of the winding direction which acts on the said 1st protective film larger than the tension of the winding direction which acts on the said glass film in the said method by the said method.

In this way, the movement of a glass film can be pressed by a 1st protective film, without applying a large tension directly to a glass film. That is, the effect equivalent to the case where tension is applied directly to a glass film can be acquired. Therefore, the winding shift | offset | difference and the rise of the glass film which generate | occur | produce in a 1st winding process can be suppressed to the minimum range. In addition, since the glass film is reliably pressed by the 1st protective film in the state of a raw glass roll, when the glass film is unwound from a raw glass roll in a 2nd winding process, the glass film in a raw glass roll is unwound and tightened. The situation to say is hard to occur. Moreover, when a glass film is wound and tightened, since a friction generate | occur | produces between a glass film and a protective film, there exists a possibility that a micro scar may be formed in the surface of a glass film.

In the said method, you may make tension of the winding direction which acts on the said glass film in the said 2nd winding process larger than the tension of the winding direction which acts on a said 2nd protective film.

In this way, it is possible to reliably prevent the situation that the winding shift or float occurs after the glass film due to the tension acting on the glass film itself in the glass roll manufactured in the second winding step, that is, the glass roll to be a product. Can be. In other words, since the glass film is not forcibly pressed by the second protective film and the glass film is not corrected, it is difficult for an undue stress to act on the glass film, thereby maintaining a stable packing state.

It is preferable to convey, carrying out only the one surface of the said glass film in contact with the said method in the said 2nd winding process.

In this way, the other surface of a glass film turns into a non-contact surface. Therefore, the micro scars resulting from conveyance become difficult to form on the surface of the glass film used as this non-contact surface. Therefore, when manufacturing a glass substrate for FPDs, such as an organic electroluminescent display, from this glass film, if an element or wiring is formed in the side which becomes a non-contact surface of a glass film, the defective formation of an element or wiring by a microwound will hardly arise, and reliability It becomes possible to provide this high FPD.

By the said method, it is preferable to wind so that the said contact support surface of the said glass film may be located in the inner peripheral surface side of the said glass roll in a said 2nd winding-up process.

In this case, even if micro-wounds generate | occur | produce in the contact support surface of a glass film, since this contact support surface is wound so that it may be located in the inner peripheral surface side of a glass roll, only a compressive stress acts on a contact support surface. Therefore, even if a microwound is generated on the contact support surface, the force for advancing the microwound is difficult to act. In other words, since the non-contact surface which is substantially free of micro-wounds is located in the surface on the outer peripheral surface side of the glass film on which the force to which the micro-wounds progresses acts, it is possible to reliably reduce the breakage of the glass film.

In the said method, you may wind up after cut | disconnecting the said glass film to a predetermined width by laser cutting in at least one of the said 1st winding process and the said 2nd winding process. Here, laser cutting includes laser cutting and laser melting. Laser cutting is a method of cutting a glass film by advancing an initial crack using thermal stress generated by expansion by a heating action of a laser and shrinkage by a cooling action of a refrigerant. On the other hand, laser melting is a method of cutting by injecting a high pressure gas into a portion where the glass is softened and melted by heating by laser energy.

In this case, for example, when forming by the overflow downdraw method or the like, the relatively ineffective portion (edge portion) formed in the width direction both ends of the glass film can be wound up after being cut off. Moreover, it can also wind up after changing a glass film to a desired width. And since these glass films are cut | disconnected by laser cutting, the advantage that it is hard to form the micro crack which becomes a damage cause in the cut end surface of a glass film can be enjoyed.

In the above method, the downdraw method is preferably an overflow downdraw method.

In this way, the outstanding smoothness with small surface roughness can be provided to the surface of a glass film, even if it does not process separately to the surface of a glass film after shaping | molding.

In the said method, it is preferable that the thickness of the said glass film is 1 micrometer or more and 300 micrometers or less.

In this case, since sufficient flexibility can be provided to a glass film, when a glass film is wound up, the situation that an unfair stress acts on a glass film can be reduced, and it also leads to prevention of damage of a glass film.

2nd invention created in order to solve the said subject is a manufacturing method of the glass roll which shape | molds a glass film by the downdraw method, and superimposes the formed glass film on a protective film, and winds up in roll shape, Comprising: The glass film and the protective film are wound up while giving a greater tension in the winding direction than the glass film.

According to this method, since a glass film can be tightened by the tension | tensile_strength of the relatively large winding direction imparted to a protective film, even if it does not give a tension | strength of the large winding direction to a glass film, a glass roll without looseness in winding can be manufactured. have. In addition, since the tension | tensile_strength of a winding direction is not given to the glass film at the time of winding up a glass film, or the tension | tensile_strength is small, even if it winds up after winding a glass film in a curved area so that it may follow substantially a horizontal direction, the curvature of a curved area may be It can prevent that change, and shaping | molding of a glass film can be stabilized, and the glass film which does not have a curvature, a curvature, and a change of plate | board thickness can be wound up.

In the said method, you may make it cut the non-effective part (edge part) formed in the width direction both ends of the said glass film in the step until it winds up a glass film in roll shape. Here, laser cutting includes laser cutting and laser melting. Laser cutting is a method of cutting a glass film by advancing an initial crack using thermal stress generated by expansion by a heating action of a laser and shrinkage by a cooling action of a refrigerant. On the other hand, laser melting is a method of cutting by injecting a high pressure gas into a portion where the glass is softened and melted by heating by laser energy.

In this way, appropriate smoothness can be easily provided to the cut surface which comprises the both end surface of the width direction of a glass film, without performing post-processing, such as grinding | polishing. In addition, since the protective film is provided with a relatively large tension in the winding direction, the end face of the glass film and the protective film are easily in contact with each other. There is no presence, and the separability of a glass film and a protective film can be kept favorable. Moreover, when winding up a glass film in roll shape, a minute wound becomes hard to produce on both end surfaces of a glass film. Thereby, since the glass powder generate | occur | produced by the crack resulting from the fine wound of the end surface of a glass film can be reduced, it is very advantageous also in ensuring the cleanliness of the front and back surface of a glass film.

In the said method, it is preferable to wind up the said glass film and the said protective film, overlapping the said protective film on the outer peripheral surface side of the said glass film so that the said protective film may remain in the outermost layer.

In this case, a glass film can be easily tightened with a protective film, and the glass roll without looseness can be reliably manufactured.

In the above method, the downdraw method is preferably an overflow downdraw method.

In this case, since the glass film which is excellent in the surface smoothness can be shape | molded without performing a separate process after shaping | molding, it becomes easy to manufacture the glass roll which is excellent in surface precision.

The 3rd invention created in order to solve the said subject is the glass roll which rolled up the glass film shape | molded by the down-draw method to the protective film, and wound in roll shape, The said protective film is given the tension of the winding direction larger than the said glass film. It is characterized by being.

According to such a structure, it can be set as the glass roll which wound up the glass film which does not have curvature, bending, and plate | board thickness without loosening.

In the said structure, it is preferable that the thickness of the said glass film is 1 micrometer or more and 300 micrometers or less.

In this way, appropriate flexibility can be provided to a glass film. Therefore, when winding up a glass film, the undue stress which acts on a glass film can be reduced, and damage can be prevented.

In the said structure, it is preferable that arithmetic mean roughness Ra of the both end surface of the width direction of the said glass film is 0.1 micrometer or less.

In this way, appropriate smoothness can be provided to both end surfaces of the glass film in the width direction. Since the protective film is provided with a relatively large tension in the winding direction, the end face of the glass film and the protective film are easily in contact with each other, but even when in contact, the end face does not enter the protective film by smoothing the end face of the glass film. The separability of a glass film and a protective film can be kept favorable.

In the said structure, it is preferable that the said protective film protrudes from the width direction both sides of the said glass film.

In this way, it becomes possible to protect the width direction both end surfaces of a glass film with a protective film. Moreover, since the width direction both ends of a glass film are covered by a protective film, invasion of a foreign material from the outside can also be prevented.

(Effects of the Invention)

According to the first invention described above, after the glass film continuously formed by the downdraw method is wound in the first winding step, the glass film is larger in the winding direction than the first winding step in the second winding step. It is wound up again in the state which worked. Therefore, even when the glass film is continuously molded by the downdraw method, the glass film is subjected to the first winding step and the second winding step to provide a suitable tension, thereby producing a glass roll which is hard to cause winding shift or float. It becomes possible.

Moreover, according to the above 2nd invention and 3rd invention, even if it does not apply the tension of a large winding direction to a glass film, since a glass film can be tightened by the tension of the relatively large winding direction provided to the protective film, winding shift and It is possible to manufacture a glass roll which is less likely to rise.

1 is a flowchart of a method for producing a glass roll according to an embodiment of the present invention.
It is a figure for demonstrating the implementation situation of the shaping | molding process, the cutting process, and the temporary winding process contained in the manufacturing method of the glass roll which concerns on this embodiment.
It is a figure for demonstrating the implementation situation of this winding process contained in the manufacturing method of the glass roll which concerns on this embodiment.
4 is a view for explaining another embodiment of the present winding step included in the method for manufacturing a glass roll according to the present embodiment.
FIG. 5: is a figure for demonstrating the other implementation status of this winding process included in the manufacturing method of the glass roll which concerns on this embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS It is a flowchart of the manufacturing method of the glass roll which concerns on 1st Embodiment of this invention. The manufacturing method of this glass roll includes a molding process (S1), a cutting process (S2), a temporary winding process (1st winding process) (S3), and this winding process (2nd winding process) (S4). .

In this embodiment, the molding step S1 is performed by the molding apparatus 1 that executes the overflow downdraw method, as shown in FIG. 2. This shaping | molding apparatus 1 has the shaping | molding zone 2, the slow cooling (annealing) zone 3, and the cooling zone 4 in order from upper direction. In addition, the shaping | molding apparatus 1 may implement another downdraw method, such as a slot downdraw method and a lead draw method.

In the forming zone 2, the molten glass Gm is supplied to the molded body 5 which has a wedge-shaped cross-sectional shape, and the molten glass Gm which overflowed to both sides from the top part of this molded object 5 at the lower end part is provided. By fusing and letting it fall, plate-shaped glass film G is shape | molded from molten glass Gm. As the glass film G moves downward, the viscosity gradually increases, and after reaching a sufficient viscosity to maintain the shape, the glass film G is deformed and removed in the slow cooling zone 3, and further cooled to about room temperature in the cooling zone 4. .

In the slow cooling zone 3 and the cooling zone 4, the roller group 6 which has a pair of roller is arrange | positioned in the several place from the upstream side to the downstream side of the conveyance path | route of the glass film G, and the glass film ( Both ends of the width direction of G) are guided below. Moreover, in this embodiment, the roller provided in the uppermost part of the shaping | molding zone 2 in the shaping | molding apparatus 1 functions as a cooling roller which cools the width direction both ends of the glass film G, and makes glass film G downward. It also functions as a drive roller for drawing out. On the other hand, the remaining rollers in the molding apparatus 1 are in charge of guiding the glass film G downward as the revolving roller, the tension roller, and the like.

Glass film G shape | molded at this shaping | molding process (S1) is a long body of 1-600 micrometers in thickness (preferably 1-300 micrometers, More preferably, 10-200 micrometers), for example, For example, glass substrates of glass substrates of devices such as FPDs such as liquid crystal displays, plasma displays, organic EL displays, solar cells, lithium ion batteries, digital signage, touch panels, and electronic papers, and glass containers of organic EL lighting, and medical products. It is used for window panes and laminated lightweight window panes.

Moreover, it is preferable that the width | variety of glass film G is 100 mm or more, It is more preferable that it is 300 mm or more, It is still more preferable that it is 500 mm or more. In addition, glass film G is used for a wide range of devices from a small screen display such as a small mobile phone to a large screen display such as a large television receiver. Therefore, it is preferable to select suitably the width | variety of glass film G according to the magnitude | size of the board | substrate of the device used finally.

Moreover, although various glass compositions, such as silicate glass, such as a silica glass and borosilicate glass, can be used as a glass composition of glass film G, it is preferable that it is an alkali free glass. When an alkali component is contained in the glass film G, a phenomenon called soda injection occurs and becomes structurally coarse, and when the glass film G is curved, it becomes structurally coarse due to aging deterioration. This is because there is a risk of damage. In addition, an alkali free glass said here is glass which does not contain an alkali component substantially, Specifically, an alkali metal oxide says 1000 ppm or less (preferably 500 ppm or less, More preferably, 300 ppm or less). As glass which satisfy | fills this condition, OA-10G by Nippon Denki Glass Co., Ltd. is mentioned, for example.

And the glass film G shape | molded by the above molding process S1 has the attitude-conversion roller group 7 which has several rollers which support the glass film G from the downward position at the downward direction of the shaping | molding apparatus 1. Is bent in a substantially horizontal direction and then transferred to the cutting step S2 in a state where the posture is maintained. In addition, this attitude-conversion roller group 7 may be abbreviate | omitted suitably.

In cutting process S2, the non-effective part (edge part) Gx formed in the width direction both ends of the glass film G in the shaping process S1 is cut off by the cutting device 8. This ineffective part Gx becomes relatively thick compared with the effective part Ga of the width direction center part of glass film G. As shown in FIG.

Specifically, the cutting device 8 performs laser cutting, and the conveying means 9 which conveys the glass film G continuously shape | molded by the shaping | molding apparatus 1 to a downstream side in substantially horizontal position, and this conveyance Local heating means 10 which irradiates a laser beam L from the surface side to glass film G mounted on the means 9, and performs local heating, and heating heated by this local heating means 10 The cooling means 11 which injects cooling water W from the surface side in the area is provided. Thus, when glass film G is cut | disconnected by laser cutting, suitable smoothness can be easily provided to the cut surface which comprises the both end surfaces of the width direction of glass film G, without performing post-processing, such as grinding | polishing. Therefore, there exists an advantage that the end surface of glass film G does not bite into protective film F1, and the separability of glass film G and protective film F1 can be kept favorable. Moreover, when winding up glass film G in roll shape, there also exists an advantage that the crack by a fine wound hardly arises in the both end surfaces of glass film G. Here, it is preferable that arithmetic mean roughness Ra of the width direction both end surfaces of glass film G is 0.1 micrometer or less, and, from a viewpoint which perfumes the above advantages more reliably, it is more preferable that it is 0.05 micrometer or less.

In this embodiment, although the carbon dioxide laser is used as the local heating means 10, the means which can perform other local heating, such as a heating wire and a hot air injection, may be sufficient. In addition, although the cooling means 11 injects cooling water W as a refrigerant | coolant by air pressure etc., this refrigerant | coolant mixes coolant other than cooling water, gas, such as air and an inert gas, or gas and liquid, and dry. It may be a mixture of a solid such as ice or ice and the gas and / or the liquid. In addition, the cutting device 8 may use a diamond cutter to perform division along a scribe line or to perform laser melting.

By conveying the glass film G downstream by the conveying means 9, the cutting area in which the heating area of the local heating means 10 extends along the longitudinal direction of the glass film G before the cooling area of the cooling means 11 is carried out. The predetermined line (the boundary between the effective part Ga and the invalid part Gx) is scanned from one end side. As a result, thermal stress is generated by expansion due to the heating action and shrinkage due to the cooling action of the refrigerant, and an initial crack (not shown) previously formed at the distal end portion of the cutting schedule line is advanced along the cutting schedule line to form a glass film (G). ) Are subsequently split into full bodies.

The ineffective portion Gx of the cut glass film G is bent downward, separated from the effective portion Ga, and disposed of. On the other hand, the effective part Ga of the glass film G is conveyed by the temporary winding process S3.

In the temporary winding process S3, the protective film unwound from the protective roll 12 at the outer peripheral surface side of glass film G (in detail, effective part Ga) so that protective film F1 may be maintained in the outermost layer ( After winding the predetermined length around the core 13 while overlapping F1), the glass film G and the protective film F1 are cut | disconnected in the width direction by the cutting device not shown, and the raw glass roll 14 is manufactured. . At this time, when the tension is excessively applied to the glass film G, excessive tension is applied to the glass film G which is in a softened state near the molded body 5, so that the thickness of the glass film G becomes unstable, or in some cases A fatal problem of insulating the lower part of the molded body 5 may occur. Therefore, in the temporary winding process S3, tension | tensile_strength along the winding direction to the glass film G (for example, width direction 0-20 to the glass film G) in the range which does not adversely affect the shaping | molding of glass film G. (Less than) N / m] is wound around the core 13 while acting. Here, in the temporary winding step (S3), it is not necessary to actively exert the tension on the glass film (G), and only the minimum tension naturally acting when the glass film (G) is wound may be applied.

Moreover, in this embodiment, the tension | tensile_strength of the larger winding direction is made to act on the protective film F1 than glass film G in temporary winding process S3. Specifically, the tension in the width direction of 0.8 to 400 N / m is applied to the protective film F1, for example. The tension of the protective film F1 is, for example, to form a difference in rotational speed between the glass roll 14 and the protective roll 12, or as shown between the glass roll 14 and the protective roll 12. It is provided by interposing the same tension roller 15. In this way, the movement of the glass film G can be pressed by the protective film F1, even if it does not apply a large tension directly to the glass film G. That is, the effect equivalent to the case where tension is applied directly to glass film G can be acquired. Therefore, the winding shift | offset | difference and the rise of the glass film G which arise in the temporary winding process S3 can be suppressed to the minimum range. In addition, since the glass film G is reliably pressed by the protective film F1 in the state of the original glass roll 14, the glass film G from the original glass roll 14 in this winding process S4 mentioned later. ), The situation that the glass film G in the original glass roll 14 is unreasonably wound and tightened hardly occurs.

It is preferable that the thickness of the protective film F1 for the raw glass roll 14 is 20-1000 micrometers (more preferably, 25-500 micrometers). Moreover, it is preferable that the width | variety of the protective film F1 is larger than the width | variety of the effective part Ga of the glass film G in order to protect the width direction both ends of the glass film G from various contacts. That is, it is preferable to make protective film F1 protrude on the both sides of the effective direction Ga of glass film G in the width direction.

In addition, since the temperature of glass film G may be 50 degreeC or more in the step of carrying out temporary winding process S3, it is preferable that protective film F1 does not deteriorate, such as softening at around 100 degreeC.

It is preferable to use an elastic film for protective film F1. Thereby, the raw glass roll 14 without loosening can be produced, giving the protective film F1 the appropriate winding direction ˜tensile. Here, it is preferable that the tensile elasticity modulus of protective film F1 is 1-5 kPa.

It is preferable that electroconductivity is provided to protective film F1. In this case, since peeling electrification becomes less likely to occur between glass film G and protective film F1 when taking out glass film G from the original glass roll 14, protective film F1 from glass film G. ) Can be easily peeled off. As a method of providing electroconductivity to protective film F1, when protective film F1 is resin, for example, adding the component which gives electroconductivity, such as polyethyleneglycol, to protective film F1 is mentioned. Moreover, when protective film F1 is paper, what contains electroconductive fiber in paper is mentioned. Moreover, electroconductivity can be provided to protective film F1 also by forming a conductive film, such as ITO, on the surface of protective film F1.

Specifically as protective film (F1), for example, an ionomer film, a polyethylene film, a polypropylene film, a polyvinyl chloride film, a polyvinylidene chloride film, a polyvinyl alcohol film, a polyester film, a polycarbonate film, a polystyrene film , Organic resin films such as polyacrylonitrile film, ethylene vinyl acetate copolymer film, ethylene-vinyl alcohol copolymer film, ethylene-methacrylic acid copolymer film, polyamide film, polyimide film and cellophane (synthetic resin film) Resin films, such as these, can be used. Moreover, from a viewpoint of ensuring buffer performance, foaming resin films, such as a polyethylene foamed resin film, a composite material etc. which laminated | stacked the foamed resin film on the said resin film can be used as protective film F1. Moreover, you may disperse lubricants, such as a silica which make sliding with glass film G favorable, in the said resin film. In this way, the shift | offset | difference of both winding lengths which generate | occur | produces by the difference of the slight winding diameter of glass film G and protective film F1 can be absorbed by the sliding property of protective film F1. In addition, the same also applies to the protective film F2 for the glass rolls 16 mentioned later.

In addition, the matter about the said protective film F1 is the same also about the protective film F2 for glass rolls 16 mentioned later.

And the raw glass roll 14 manufactured by the temporary winding process S3 mentioned above is conveyed to this winding process S4, and is wound up again.

In this winding process S4, as shown in FIG. 3, the glass film G (in detail, effective part Ga) unwound from the original glass roll 14 by the roll-to-roll apparatus is wound again. It takes and manufactures the glass roll 16 which turns into a product.

Specifically, in this embodiment, after guiding the glass film G unwound from the original glass roll 14 in the unwinding position P1 by the roller group 17 which consists of a plurality of rollers, it guides in substantially cylindrical shape, It winds up around the core 18 again at the winding position P2, and manufactures the glass roll 16. FIG. When the glass film G is guided in this way, it becomes easy to apply an appropriate tension to the glass film G also between the rollers of the roller group 17.

At this time, the protective film F1 is peeled from the glass film G at the unwinding position P1, and the protective film F1 is wound up as the protective roll 19. FIG. On the other hand, in the winding position P2, winding the protective film F2 on the outer circumferential surface side of the glass film G and laminating the protective film F2 newly released from the separate protective roll 20 so that the state in which the protective film F2 is in the outermost layer is maintained ( It is wound around 18). And after overlapping protective film F1 on glass film G, and winding up the predetermined length around the core 18, the protective film F2 (or glass film G and protective film) is not shown by the cutting device which is not shown in figure. (F2)] is cut in the width direction to manufacture the glass roll 16. In this embodiment, protective film F2 is the same as protective film F1 used at the temporary winding process S3.

And in this present winding process S4, as shown in FIG. 1, the tension b which acts on the glass film G by the tension b of the winding direction which acts on the glass film G in the temporary winding process S3. Bigger than Specifically, the tension in the width direction of 10 to 500 N / m is applied to the glass film G, for example. The tension of this glass film G is given by forming the rotational speed difference between the original glass roll 14 and the glass roll 16, for example. In this case, even if a winding shift | offset | difference and floatation generate | occur | produced in the glass film G contained in the original glass roll 14 manufactured in the temporary winding process S3, for example, it is sufficient for the glass film G in this winding process S4. By applying a tension, these winding shifts can be corrected and rewound.

In addition, in this main winding process (S4), you may make the tension | pulling of the larger winding direction act on glass film G than protective film F2. Specifically, for example, it is preferable to apply a tension in the width direction of 0.8 to 400 N / m to the protective film F2. The tension of the protective film F2 is, for example, to form a rotational speed difference between the glass roll 16 and the protective roll 20, or as shown between the glass roll 16 and the protective roll 20. It is provided by interposing the tension roller 21. In this case, the magnitude relationship between the tension in the winding direction acting on the protective film F2 in the present winding process S4 and the tension in the winding direction acting on the protective film F1 in the temporary winding process S3 is particularly limited. It is possible to set appropriately (tension of F1 <tension of F2, tension of F1 = tension of F2, tension of F1> F2) by applying various requirements.

In addition, in this winding process S4, as shown in FIG. 3, conveying, carrying out only contacting and supporting only one surface of glass film G, a glass film (so that the contact support surface may be located in the inner peripheral surface side of the glass roll 16). G) is wound up. In this case, even if a microwound arises in the contact support surface of glass film G, this contact support surface is wound so that it may be located in the inner peripheral surface side of the glass roll 16. FIG. In the glass roll 16, since only a compressive stress acts on the surface of the inner peripheral surface side of the glass film G, even if microwounds generate | occur | produce on the contact support surface, the force which the microwounds progress is hard to act | work. In other words, since the non-contact surface substantially free of micro-wounds is located at � on the outer circumferential surface side of the glass film G on which the force to which the micro-wounds evolve acts, it is possible to reliably reduce the breakage of the glass film G. . In addition, in this embodiment, only one surface of glass film G is contact-supported also in the temporary winding process S3, and the contact support surface is set to the same side as the contact support surface of this winding process S4.

In addition, this invention is not limited to the said 1st Embodiment, It can implement in various forms. For example, as shown in FIG. 4, you may make it perform a cutting process also in this winding process S4. In detail, the glass film G (in detail, the effective part Ga) unwound from the original glass roll 14 is cut | disconnected in the width direction, and the plurality of glass films (two shown in the example) which have a desired width | variety ( You may divide into G), overlap the protective film F2 on each glass film G, and wind up around the core 18, and may manufacture several glass roll 16 simultaneously.

Moreover, in the said embodiment, although the case where the surface located in the inner peripheral surface side in the state of the original glass roll 14 was made into the contact support surface of the glass film G at the time of conveyance was demonstrated, as shown in FIG. 4, the original glass roll The surface located in the outer peripheral surface side in the state of (14) may be used as the contact support surface of the glass film G at the time of conveyance. In addition, in the said embodiment, although the case where this contact support surface was wound so that it might be located in the inner peripheral surface side of the glass roll 16 was demonstrated, you may make it wind so that it may be located in the outer peripheral surface side of the glass roll 16. FIG.

In addition, although the said embodiment demonstrated the case where it winds up after guide | inducing while circumventing the glass film G unwound from the original glass roll 14 to substantially cylindrical shape in this winding process S4, as shown in FIG. You may make it wind up, after guide | inducing the glass film G unwound from the original glass roll 14 to linear form.

In addition, in the said embodiment, although the case where this winding process S4 is performed only once after the temporary winding process S3 was demonstrated, the process of winding up the glass film G again after this winding process S4 is performed once- A plurality of times may be included.

Next, the manufacturing method of the glass roll which concerns on 2nd Embodiment of this invention is demonstrated. In addition, this 2nd Embodiment can be implemented in the form similar to FIG. 1, and differs in the point which performs a temporary winding process S3 as this winding process which manufactures the glass roll used as a final product.

In detail, in this 2nd Embodiment, as shown in FIG. 1, while shape | molding glass film G by the down-draw method, the protective film F1 is piled up on the outer peripheral side of the molded glass film G, The glass roll used as a final product is manufactured by winding up in roll shape, giving the protective film F1 larger tension | winding direction than glass film G. And the glass roll manufactured in this way is given the tension of the winding direction larger than glass film G to protective film F1 in the wound state.

Here, the tension imparted to the protective film F1 and the tension imparted to the glass film G include the tension described in the temporary winding step S3 described in the first embodiment (for example, the glass film G). To the width direction 0-20 (less than) N / m, and protective film F1, and it is similar to the width direction 0.8-400 N / m].

(Industrial availability)

This invention can be used suitably for glass substrates used for flat panel displays, such as a liquid crystal display and an organic electroluminescent display, and devices, such as a solar cell, and cover glass, such as organic electroluminescent illumination.

1: forming apparatus 2: forming zone
3: slow cooling zone 4: cooling zone
5: molded body 7: posture converting roller group
8: cutting device 9: conveying means
10 local heating means 11 cooling means
14: glass roll 16: glass roll
F1, F2: protective film G: glass film

Claims (16)

A molding step of conveying the glass film to the downstream side while continuously molding the glass film by a molding apparatus that performs the downdraw method;
A first winding step of manufacturing a raw glass roll by laminating a first protective film on the glass film at a downstream end of the conveying path of the molding step and winding in roll shape;
The 2nd winding process which conveys to the downstream side, unwinding the said glass film from the said raw glass roll, superimposes a 2nd protective film on the glass film at the downstream end of the conveyance path, and winds up again in roll shape, and manufactures a glass roll. Including,
A tension in the winding direction acting on the glass film in the second winding step is made larger than a tension acting on the glass film in the first winding step. The method according to claim 1,
In the said 1st winding process, the tension of the winding direction which acts on the said 1st protective film was made larger than the tension of the winding direction which acts on the said glass film, The manufacturing method of the glass roll characterized by the above-mentioned. 3. The method according to claim 1 or 2,
In the said 2nd winding process, the tension of the winding direction which acts on the said glass film was made larger than the tension of the winding direction which acts on the said 2nd protective film, The manufacturing method of the glass roll characterized by the above-mentioned. 4. The method according to any one of claims 1 to 3,
It conveys, carrying out only the one surface of the said glass film in contact support in a said 2nd winding process, The manufacturing method of the glass roll characterized by the above-mentioned. 5. The method of claim 4,
It is wound so that the said contact support surface of the said glass film may be located in the inner peripheral surface side of the said glass roll in a said 2nd winding process, The manufacturing method of the glass roll characterized by the above-mentioned. 6. The method according to any one of claims 1 to 5,
At least one of the said 1st winding process and the said 2nd winding process cuts the said glass film to a predetermined width by laser cutting, and winds up, The manufacturing method of the glass roll characterized by the above-mentioned. 7. The method according to any one of claims 1 to 6,
The down draw method is an overflow down draw method. 8. The method according to any one of claims 1 to 7,
The thickness of the said glass film is 1 micrometer or more and 300 micrometers or less, The manufacturing method of the glass roll characterized by the above-mentioned. As a manufacturing method of the glass roll which shape | molds a glass film by the down-draw method and superimposes the shape | molded glass film on a protective film, and winds up in roll shape,
Winding the said glass film and the said protective film, giving the said protective film a tension | tensile_strength larger than the said glass film, The manufacturing method of the glass roll characterized by the above-mentioned. The method of claim 9,
And laser-cutting the non-effective part formed in the width direction both ends of the said glass film in the step until it winds up a glass film in roll shape. 11. The method according to claim 9 or 10,
A method of manufacturing a glass roll, wherein the glass film and the protective film are wound while the protective film is overlapped on the outer circumferential surface side of the glass film so that the protective film is kept in the outermost layer. 12. The method according to any one of claims 9 to 11,
The down draw method is an overflow down draw method. As a glass roll which rolled up the glass film shape | molded by the down-draw method to the protective film, and wound up in roll shape,
The tension of the winding direction larger than the said glass film is given to the said protective film, The glass roll characterized by the above-mentioned. 14. The method of claim 13,
The thickness of the said glass film is 1 micrometer or more and 300 micrometers or less, The glass roll characterized by the above-mentioned. The method according to claim 13 or 14,
Arithmetic mean roughness Ra of the both end surfaces of the width direction of the said glass film is 0.1 micrometer or less, The glass roll characterized by the above-mentioned. 16. The method according to any one of claims 13 to 15,
The said protective film protrudes from the width direction both sides of the said glass film, The glass roll characterized by the above-mentioned.

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