glass roll

Abstract

The glass roll (1) includes a structure in which a laminated film (5) is wound in a roll shape, wherein the laminated film (5) includes: a glass film (2); a protective film (3); and an adhesive layer (4) which is disposed between the glass film (2) and the protective film (3) and bonds the glass film (2) to the protective film (3). The width (A) of the protective film (3) is larger than the width (B) of the glass film (2), and both ends (3x) of the protective film (3) in the width direction extend from the glass film (2). The width (B) of the glass film (2) is larger than the width (C) of the adhesive layer (4), and both ends (2x) of the glass film (2) in the width direction extend from the adhesive layer (4).

Description

Technical Field

[0001] The present invention relates to a glass roll formed by winding a glass film in a roll shape. Background Art

[0002] As is well known, thin display devices such as liquid crystal displays and organic EL displays, as well as mobile devices such as smart phones and tablet PCs that have rapidly become popular in recent years, are required to be lightweight. Therefore, as glass substrates used in these devices, glass films that are thinned into film-like shapes are used. The glass films are in a roughly rectangular shape or the like at the final product stage, but are handled as strip-shaped components in the manufacturing process and various processing steps before this.

[0003] This glass film has appropriate flexibility, and therefore is sometimes provided in the form of a glass roll wound around a winding core, etc., in consideration of convenience during storage and transportation. Therefore, if the glass film is provided in the form of a glass roll in advance, not only is storage performance excellent, but it is also possible to easily cut a plurality of glass films in a substantially rectangular shape.

[0004] On the other hand, since such glass films have low mechanical strength, they are easily damaged or broken, and therefore care must be taken when handling them in this state. That is, when the glass film is rolled up to form a glass roll, the rolled glass films come into contact with each other, which may cause damage such as scratches. Therefore, it is widely practiced to roll up the glass film in a state where a strip-shaped protective film made of resin or the like is overlapped, thereby forming a glass roll.

[0005] For example, Patent Document 1 discloses a method of manufacturing a glass roll by bonding a glass film and a protective film having an adhesive layer (adhesive surface) to form a laminated film and then winding the laminated film into a roll.

[0006] This document discloses that the width of the protective film is smaller than the width of the glass film or that the width of the protective film is greater than the width of the glass film. It should be noted that the adhesive layer is formed on the entire surface of one side of the protective film. That is, the size of the adhesive layer is the same as the size of the protective film.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Publication No. 2018-187797 Summary of the invention

[0010] Problems to be solved by the invention

[0011] In the glass roll disclosed in Patent Document 1, when the width of the protective film is made smaller than the width of the glass film, both ends of the glass film in the width direction extend out from the protective film. In this case, the ends of the glass film in the width direction cannot be protected by the protective film. As a result, for example, when the laminated film pulled out from the glass roll is put into a conveying device such as a roll-to-roll device in order to perform manufacturing-related processes such as film formation, printing, and bonding of other components on the glass film, the ends of the glass film in the width direction may contact the conveying device (for example, guide rollers, etc.) and may be damaged. It should be noted that when the width of the protective film is set to be the same as the width of the glass film, the ends of the glass film in the width direction cannot be fully protected by the protective film, and the problem of glass film damage may also occur.

[0012] On the other hand, in the glass roll disclosed in Patent Document 1, when the width of the protective film is set to be larger than the width of the glass film, the two ends of the protective film in the width direction extend from the glass film respectively. In this case, since the ends of the glass film in the width direction can be protected by the protective film, the breakage of the glass film can be suppressed. However, since the size of the adhesive layer is the same as that of the protective film, the adhesive layer is exposed on the surface of the protective film extending from the end of the glass film. As a result, when the laminated film pulled out from the glass roll is put into the conveying equipment, the adhesive (adhesive) constituting the adhesive layer adheres to the conveying equipment, which may contaminate the conveying equipment. It should be noted that when the width of the protective film is set to be the same as the width of the glass film, the end faces of the glass film, the protective film and the adhesive layer in the width direction are located on the same plane, so the problem of contamination of the conveying equipment caused by the adhesion of the adhesive constituting the adhesive layer may also occur.

[0013] An object of the present invention is to provide a glass roll capable of suppressing breakage of a glass film and suppressing contamination of the surrounding environment by an adhesive.

[0014] Solutions to Solve Problems

[0015] The present invention made to solve the above-mentioned problems is a glass roll, including a structure in which a laminated film is rolled up, the laminated film comprising: a glass film; a protective film; and an adhesive layer, which is arranged between the glass film and the protective film and bonds the glass film to the protective film, the glass roll is characterized in that the width of the protective film is larger than the width of the glass film, both ends of the protective film in the width direction extend from the glass film respectively, and the width of the glass film is larger than the width of the adhesive layer, and both ends of the glass film in the width direction extend from the adhesive layer respectively.

[0016] In this way, the width of the protective film is larger than that of the glass film, and both ends of the protective film in the width direction extend from the glass film, so that both ends of the glass film in the width direction are reliably protected by the protective film. In addition, the width of the glass film narrower than the protective film is larger than the width of the adhesive layer, and both ends of the glass film in the width direction extend from the adhesive layer, so that the adhesive layer is completely hidden in the protective film and the glass film at a position closer to the inside than the ends in the width direction. Therefore, the protective film can suppress the breakage of the glass film, and the pollution of the surrounding environment caused by the adhesion of the adhesive constituting the adhesive layer can be suppressed.

[0017] In the above-mentioned structure, it is preferable that the width of each end portion of the glass film in the width direction protruding from the adhesive layer is 0.1 mm to 10 mm.

[0018] In this way, a sufficient bonding area for reliably bonding the glass film and the protective film can be ensured, and contamination of the transport equipment due to the adhesive layer can be more reliably suppressed.

[0019] In the above-mentioned structure, it is preferable that the width of each end portion of the protective film in the width direction protrudes from the glass film by 1 mm to 100 mm.

[0020] In this way, the end portions of the glass film in the width direction can be reliably protected by the protective film, and it is possible to prevent the protective film from being excessively larger than the glass film and causing waste on the protective film.

[0021] In the above-mentioned structure, the adhesive layer may be a slight adhesive layer formed on one surface of the protective film.

[0022] In this manner, the glass film can be easily peeled off from the protective film as needed.

[0023] In the above structure, it is preferable that the thickness of the adhesive layer is 100 μm or less.

[0024] In this manner, since the adhesive layer is sufficiently thin, it is possible to more reliably suppress contamination of the transport equipment due to adhesion of the adhesive constituting the adhesive layer.

[0025] Effects of the Invention

[0026] According to the present invention, damage to the glass film can be suppressed by the protective film, and contamination of the surrounding environment due to adhesion of the adhesive constituting the adhesive layer can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a perspective view showing the glass roll according to the first embodiment.

[0028] Figure 2 yes Figure 1 SS cross-sectional view.

[0029] Figure 3 This is a side view showing the method for manufacturing a glass roll according to the first embodiment.

[0030] Figure 4 This is a side view showing the method for manufacturing a glass roll according to the second embodiment.

[0031] Figure 5 This is a side view showing a method for manufacturing a glass roll according to a third embodiment. DETAILED DESCRIPTION

[0032] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0033] (First Embodiment)

[0034] like Figure 1 As shown, the glass roll 1 of the first embodiment is obtained by winding a laminated film 5 in which a strip-shaped glass film 2 and a strip-shaped protective film 3 are overlapped with an adhesive layer 4 interposed therebetween around a winding core 6 in a roll shape.

[0035] The glass film 2 has a first surface 2a and a second surface 2b in a front-back relationship. In the present embodiment, when the glass roll 1 is used for electronic components, the first surface 2a is a guaranteed surface and the second surface 2b is a non-guaranteed surface. The guaranteed surface is a surface on the product side of the component or the like and is a surface whose surface properties are guaranteed, while the non-guaranteed surface is a surface whose surface properties may not be guaranteed to the extent of the guaranteed surface. The glass roll 1 is configured so that the first surface 2a of the glass film 2 becomes the inner side and the second surface 2b becomes the outer side. It should be noted that when the glass roll 1 is used in a case where surface accuracy is not particularly required, it is not necessary to distinguish between the guaranteed surface and the non-guaranteed surface.

[0036] The thickness of the glass film 2 is preferably 300 μm or less, more preferably 10 μm or more and 200 μm or less, and most preferably 30 μm or more and 100 μm or less.

[0037] As the material of the glass film 2, silicate glass and silica glass are used, preferably borosilicate glass, soda-lime glass, aluminosilicate glass, chemically strengthened glass, and most preferably alkali-free glass. As the glass film 2, by using alkali-free glass, chemically stable glass can be obtained. Here, alkali-free glass refers to glass that does not substantially contain alkali components (alkali metal oxides), specifically, glass in which the weight ratio of alkali components is less than 3000ppm. The weight ratio of alkali components in the present invention is preferably less than 1000ppm, more preferably less than 500ppm, and most preferably less than 300ppm.

[0038] The glass film 2 can be formed by a known float method, a roll-out method, a slot down-draw method, a re-draw method, etc., but is preferably formed by an overflow down-draw method.

[0039] The thickness of the protective film 3 is preferably 10 μm or more and 1000 μm or less, and more preferably 20 μm or more and 500 μm or less.

[0040] As the material of the protective film 3, 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, a polyacrylonitrile film, an ethylene-vinyl acetate copolymer film, an ethylene-vinyl alcohol copolymer film, an ethylene-methacrylic acid copolymer film, a nylon (registered trademark) film (polyamide film), a polyimide film, an organic resin film such as cellophane (synthetic resin film), etc. can be used, and preferably a polyethylene terephthalate film (PET film) is used.

[0041] The adhesive layer 4 is formed on one surface 3a of the protective film 3 and contacts the second surface 2b of the glass film 2. That is, in the state of the laminated film 5, the second surface 2b of the glass film 2 is bonded to the one surface 3a of the protective film 3 via the adhesive layer 4.

[0042] The thickness of the adhesive layer 4 is preferably 100 μm or less, more preferably 50 μm or less, and most preferably 10 μm or less.

[0043] The adhesive layer 4 may be a layer (slightly adhesive layer) having a relatively weak adhesive force to the extent that the glass film 2 can be peeled off, or a layer having a relatively strong adhesive force to the extent that the glass film 2 cannot be substantially peeled off. Here, the adhesive layer 4 is a concept including an adhesive layer. As the slightly adhesive layer, a slightly adhesive layer having an adhesive force (peel strength) of, for example, 0.001 N / 25 mm or more and 1.5 N / 25 mm or less as measured by a 180° peel strength test (based on JIS Z 0237:2009) may be used.

[0044] As the material of the adhesive layer 4, for example, a rubber adhesive, an acrylic adhesive, a silicone adhesive, a polyether, a polyurethane adhesive, etc. can be used. Since the acrylic adhesive leaves less paste residue when peeled off, it is preferred when the peeling of the glass film 2 is a prerequisite. In addition, as the form of the adhesive layer 4, a solvent-based adhesive, a non-aqueous emulsion adhesive, an aqueous emulsion adhesive, a water-soluble adhesive, a solvent-free adhesive, a liquid curing adhesive, etc. can be used. It should be noted that in the case of setting the adhesive layer 4 to a layer with a strong adhesive force to the extent that the glass film 2 cannot be peeled off substantially, various thermoplastic resin adhesives and thermosetting resin adhesives can also be used.

[0045] The winding core 6 is in the shape of a hollow cylinder in this embodiment, but may also be in the shape of a solid cylinder.

[0046] The material of the core 6 is not particularly limited, but for example, metals such as aluminum alloy, stainless steel, manganese steel, carbon steel, thermosetting resins such as phenolic resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, polyurethane, poly(diallyl terephthalate) resin, thermoplastic resins such as polyethylene, polypropylene, polystyrene, AS resin, ABS resin, methacrylic resin, vinyl chloride, or reinforced plastics, paper tubes, etc. in which these thermosetting resins and thermoplastic resins are mixed with reinforcing fibers such as glass fiber and carbon fiber.

[0047] like Figure 2 As shown, in the laminated film 5, the width A of the protective film 3 is larger than the width B of the glass film 2, and both ends 3x of the protective film 3 in the width direction extend from the glass film 2. In addition, the width B of the glass film 2 is larger than the width C of the adhesive layer 4, and both ends 2x of the glass film 2 in the width direction extend from the adhesive layer 4.

[0048] The width D of each end portion 2 x in the width direction of the glass film 2 extending from the adhesive layer 4 is preferably 0.1 mm to 10 mm, and more preferably 0.5 mm to 1 mm.

[0049] The extension width E of each end portion 3 x in the width direction of the protective film 3 from the glass film 2 is preferably 1 mm to 100 mm, and more preferably 3 mm to 10 mm.

[0050] In the glass roll 1, both ends 3x of the protective film 3 in the width direction extend from the glass film 2, so that both ends 2x of the glass film 2 in the width direction are reliably protected by the protective film 3. In addition, both ends 2x of the glass film 2 in the width direction, which is narrower than the protective film 3, extend from the adhesive layer 4, so that the adhesive layer 4 is completely hidden inside the glass film 2 and the protective film 3, respectively, relative to the ends 2x and 3x in the width direction. Therefore, even when the laminated film 5 is pulled out from the glass roll 1 and put into a conveying device, it is possible to suppress damage to the glass film 2 and contamination of the surrounding environment caused by adhesion of the adhesive constituting the adhesive layer 4 (for example, adhesion of the adhesive to the rollers of the conveying device, etc.).

[0051] Figure 3 The manufacturing device 7 of the glass roll 1 is shown. The manufacturing device 7 includes a base material glass roll 1A composed of a glass film 2 serving as a base material, a protective film supply device 8, and the glass roll 1 described above.

[0052] The mother glass roll 1A is formed by winding a glass film 2 around a winding core 6A. The winding core 6A of the mother glass roll 1A is arranged at a predetermined interval from the winding core 6 of the glass roll 1. In the present embodiment, the mother glass roll 1A and the glass roll 1 are connected by a roll-to-roll method. That is, after the glass film 2 wound around the winding core 6A is pulled out from the mother glass roll 1A, it is wound into a roll shape by the winding core 6 of the glass roll 1.

[0053] The protective film supply device 8 is disposed between the base material glass roll 1A and the glass roll 1. The protective film supply device 8 includes a protective film roll 9 and a guide roller 10.

[0054] The protective film roll 9 is obtained by winding a material in the form of a roll with a separator 11 superimposed on the adhesive layer 4 formed on one surface 3a of the strip-shaped protective film 3 by a winding core 9a. Figure 2 As shown, the width A of the protective film 3 is set larger than the width B of the glass film 2, and the width C of the adhesive layer 4 is set smaller than the width B of the glass film 2. The protective film roll 9 is arranged below the glass film 2 stretched between the mother glass roll 1A and the glass roll 1, but the present invention is not limited to this structure. The protective film roll 9 may also be arranged above the glass film 2 stretched between the mother glass roll 1A and the glass roll 1.

[0055] A winding core 11a around which the separator 11 peeled from the protective film 3 is wound is disposed near the protective film roll 9. The separator 11 and the winding core 11a may be omitted depending on the type and adhesive strength of the adhesive layer 4.

[0056] The guide roller 10 is composed of a pair of rollers and is configured to sandwich the glass film 2 and the protective film 3 .

[0057] Hereinafter, a method for manufacturing the glass roll 1 using the above-mentioned manufacturing apparatus 7 will be described. This method includes a glass film supplying step, a protective film supplying step, and a winding step.

[0058] In the glass film supplying step, the glass film 2 is pulled out from the base material glass roll 1A and conveyed toward the downstream side.

[0059] In the protective film supply process, the protective film 3 is pulled out from the protective film roll 9 as the winding core 9a rotates. At the same time, the separator 11 is peeled off from the protective film 3. The peeled separator 11 is wound by the winding core 11a. The adhesive layer 4 formed on one side 3a of the pulled out protective film 3 contacts the second side 2b of the glass film 2 via the guide roller 10. More specifically, the protective film 3 and the glass film 2 are sandwiched by the guide roller 10, so that the adhesive layer 4 formed on one side 3a of the protective film 3 is attached to the second side 2b of the glass film 2. As a result, on the downstream side of the guide roller 10, a laminated film 5 in which the glass film 2 and the protective film 3 are bonded via the adhesive layer 4 is continuously formed.

[0060] In the winding step, the laminated film 5 formed in the protective film supplying step is wound by the rotation of the winding core 6. When a predetermined length of the glass film 2 is wound around the winding core 6, the winding step is completed and the glass roll 1 is completed.

[0061] (Second Embodiment)

[0062] Figure 4 A second embodiment of the present invention will be described. In this embodiment, the manufacturing device 7 of the glass roll 1 is different from the first embodiment in that it includes a conveying device 12 and in that the structure of the protective film supply device 8 is different.

[0063] The conveying device 12 is disposed between the mother glass roll 1A and the glass roll 1. The conveying device 12 is composed of a belt conveyor, but is not limited thereto. The conveying device 12 guides the glass film 2 pulled out from the mother glass roll 1A on the upstream side to the winding core 6 on the downstream side by driving the endless belt 12a. It should be noted that the conveying device 12 may also be omitted.

[0064] The protective film supply device 8 is arranged near the glass roll 1. The protective film supply device 8 includes a protective film roll 9, a guide roller 10, and a support mechanism 13 for the guide roller 10.

[0065] The protective film roll 9 is arranged above the glass roll 1, but the structure is not limited to this. The protective film roll 9 may also be arranged at a position on the downstream side or below the glass roll 1. A winding core 11a around which the separator 11 peeled off from the protective film 3 is wound is arranged near the protective film roll 9. It should be noted that the separator 11 and the winding core 11a may also be omitted depending on the type and adhesive strength of the adhesive layer 4.

[0066] The guide roller 10 is composed of one roller. The guide roller 10 is configured to sandwich the glass film 2 and the protective film 3 together with the core 6 of the glass roll 1. The guide roller 10 is arranged above the core 6 of the glass roll 1, but is not limited to this position.

[0067] The support mechanism 13 includes a support member 14 that rotatably supports the guide roller 10 and a support shaft 15 that rotatably supports the support member 14 .

[0068] The guide roller 10 contacts the upper part of the glass roll 1 with an appropriate pressing force under the action of the moment acting around the support shaft 15 via the support member 14. When the guide roller 10 contacts the upper part of the glass roll 1, the guide roller 10 maintains contact with the glass roll 1 under the action of its own weight. The guide roller 10 is supported by the support mechanism 13 so as to move along with the increase in the outer diameter of the glass roll 1. That is, the guide roller 10 moves from the upper part of the glass roll 1 to the lower part of the glass roll 1 according to the increase in the outer diameter of the glass roll 1. Figure 2 The position indicated by the solid line in the figure gradually moves to the position indicated by the two-dot chain line. It should be noted that the support mechanism 13 may also use a fluid pressure type piston-cylinder mechanism, an electric motor, or other mechanisms.

[0069] The method for manufacturing the glass roll 1 of the present embodiment includes a glass film supplying step, a protective film supplying step, and a winding step, similarly to the first embodiment.

[0070] In the glass film supplying step, the glass film 2 is pulled out from the base material glass roll 1A and is conveyed to the downstream side by the conveying device 12 .

[0071] In the protective film supply process, the protective film 3 is pulled out from the protective film roll 9, and the separator 11 is peeled off from the protective film 3. The peeled separator 11 is wound by the winding core 11a. The guide roller 10 in the protective film supply device 8 contacts a portion (upper portion) of the glass roll 1, and the protective film 3 is brought into contact with the second surface 2b of the glass film 2 at this position. More specifically, by sandwiching the protective film 3 and the glass film 2 by the winding core 6 of the glass roll 1 and the guide roller 10, the adhesive layer 4 formed on one surface 3a of the protective film 3 is attached to the second surface 2b of the glass film 2. Thus, the laminated film 5 in which the glass film 2 and the protective film 3 are bonded via the adhesive layer 4 is continuously formed.

[0072] In the winding step, the laminated film 5 formed in the protective film supplying step is wound by the rotation of the winding core 6. When a predetermined length of the glass film 2 is wound around the winding core 6, the winding step is completed and the glass roll 1 is completed.

[0073] During the winding process, the outer diameter of the glass roll 1 increases in accordance with the rotation of the winding core 6. The guide roller 10 of the protective film supply device 8 moves in accordance with the increase in the outer diameter of the glass roll 1. The support member 14 of the support mechanism 13 rotates around the support shaft 15 (counterclockwise) to move the guide roller 10 (see FIG. Figure 4 double-dotted line in the figure).

[0074] It should be noted that the protective film supply device 8 may also be arranged near the mother glass roll 1A. That is, the guide roller 10 in the protective film supply device 8 may be brought into contact with a portion (e.g., the upper portion) of the mother glass roll 1A, and the protective film 3 may be brought into contact with the second surface 2b of the glass film 2 at this position. In this case, the laminated film 5 is supplied from the mother glass roll 1A to the downstream side (e.g., the conveying device 12).

[0075] (Third Embodiment)

[0076] Figure 5 A third embodiment of the present invention will be described. A manufacturing apparatus 7 of this embodiment manufactures a glass roll 1 by winding a glass film 2 continuously formed by an overflow down-draw method.

[0077] The manufacturing device 7 includes: a forming section 16, which forms the glass film 2; a direction changing section 17, which changes the travel direction of the glass film 2 from the longitudinal downward direction to the lateral direction; a lateral conveying section 18, which conveys the glass film 2 in the lateral direction after the direction is changed; a cutting section 19, which cuts off the ear portion 2c at the width end of the glass film 2; and a winding section 20, which rolls up the glass film 2 with the ear portion 2c removed to form a glass roll 1.

[0078] The forming section 16 comprises: a forming body 21 having an overflow groove 21a formed at an upper end portion and being roughly wedge-shaped in cross-section; an edge roller 22 disposed directly below the forming body 21 and clamping the molten glass overflowing from the forming body 21 from both sides of the front and back; and an annealing furnace 23 disposed directly below the edge roller 22.

[0079] The forming section 16 allows the molten glass overflowing from the overflow groove 21a of the forming body 21 to flow down along the two side surfaces respectively, and merge at the lower end to form a film-shaped molten glass. The edge roller 22 limits the widthwise contraction of the molten glass to form a glass film 2 of a specified width. The annealing furnace 23 is used to perform strain removal treatment on the glass film 2. The annealing furnace 23 has annealing rollers 24 arranged in multiple stages in the vertical direction.

[0080] Support rolls 25 are disposed below the annealing furnace 23 to sandwich the glass film 2 from both the front and back sides. Tension is applied between the support rolls 25 and the edge rolls 22 or between the support rolls 25 and any of the annealing rolls 24 to promote thinning of the glass film 2.

[0081] The direction-changing unit 17 is provided below the support roller 25. A plurality of guide rollers 26 for guiding the glass film 2 are arranged in a curved shape in the direction-changing unit 17. The guide rollers 26 guide the glass film 2 conveyed in the vertical direction in a lateral direction.

[0082] The lateral transport unit 18 is disposed in front of (on the downstream side of) the direction of travel of the direction change unit 17. The lateral transport unit 18 is composed of a belt conveyor, but is not limited to this structure. The lateral transport unit 18 continuously transports the glass film 2 that has passed through the direction change unit 17 to the downstream side by driving an endless belt 18a.

[0083] The cutting unit 19 is arranged above the horizontal conveying unit 18. In the present embodiment, the cutting unit 19 cuts the glass film 2 by laser cutting, but it is not limited to this, and laser melting or other cutting means may also be used. The cutting unit 19 includes a laser irradiation device 27 and a cooling device 28. The laser irradiation device 27 irradiates a laser L to a predetermined portion of the glass film 2, thereby locally heating the portion. The cooling device 28 is arranged on the downstream side of the laser irradiation device 27 in the conveying direction of the glass film 2. The cooling device 28 sprays a refrigerant W to a portion of the glass film 2 that has been locally heated to cool the portion.

[0084] The winding section 20 is provided on the downstream side of the horizontal conveying section 18 and the cutting section 19. The winding section 20 winds the glass film 2 in a roll shape by rotating the winding core 6. The protective film supply device 8 is arranged near the winding section 20. The structure of the protective film supply device 8 is the same as that of the second embodiment. It should be noted that the structure of the protective film supply device 8 may also be the same as that of the first embodiment. In this case, the protective film supply device 8 is arranged between the cutting section 19 and the glass roll 1.

[0085] Hereinafter, a method for manufacturing a glass roll 1 using the manufacturing device 7 of the above structure will be described. The manufacturing method includes: a forming step of forming a strip-shaped glass film 2 using a forming unit 16; a conveying step of conveying the glass film 2 using a direction changing unit 17 and a lateral conveying unit 18; a cutting step of cutting the widthwise end portion (ear portion 2c) of the glass film 2 using a cutting unit 19; a glass film supplying step of supplying the glass film 2 to a winding unit 20 after the cutting step; a protective film supplying step of overlapping a protective film 3 on the glass film 2; and a winding step of winding the glass film 2 using the winding unit 20.

[0086] In the forming process, the molten glass overflowing from the overflow groove 21a of the forming body 21 in the forming part 16 flows down along both sides, merges at the lower end and forms a film-shaped molten glass. At this time, the edge roller 22 restricts the shrinkage of the molten glass in the width direction and forms a glass film 2 of a specified width. After that, the glass film 2 is subjected to strain removal treatment (annealing process) by the annealing furnace 23. Under the action of the tension of the support roller 25, the glass film 2 is formed to a specified thickness.

[0087] In the conveying step, the conveying direction of the glass film 2 is changed to the lateral direction by the direction changing unit 17 , and the glass film 2 is conveyed to the winding unit 20 on the downstream side by the lateral conveying unit 18 .

[0088] In the cutting process, the glass film 2 is conveyed to the downstream side by the lateral conveying section 18, and after an initial crack is formed at the front end of the glass film 2 by a not-shown damaging member in the cutting section 19, thermal stress is generated in the glass film 2 due to expansion caused by local heating by the laser irradiation device 27 and contraction caused by cooling by the cooling device 28. As a result, the ear portion 2c, which is a non-product portion, is separated from the glass film 2, which is a product portion.

[0089] In the glass film supplying step, the glass film 2 from which the ear portion 2c is removed in the cutting step is supplied to the winding unit 20. The ear portion 2c is conveyed downstream of the lateral conveying unit 18 and recovered upstream of the winding unit 20 by a recovery device (not shown).

[0090] In the protective film supplying step, similarly to the second embodiment, the separator 11 is peeled off from the protective film 3, and the protective film 3 and the glass film 2 are sandwiched between the guide roller 10 and the winding core 6, so that the adhesive layer 4 formed on one surface 3a of the protective film 3 is attached to the second surface 2b of the glass film 2. Thus, the laminated film 5 in which the glass film 2 and the protective film 3 are bonded via the adhesive layer 4 is continuously formed.

[0091] In the winding step, the laminated film 5 is wound around the winding core 6. The winding core 6 winds the laminated film 5 so that the protective film 3 is located on the outer peripheral side of the glass film 2. When the glass film 2 is wound to a predetermined length, the winding step is completed and the glass roll 1 is completed.

[0092] It should be noted that the present invention is not limited to the configuration of the above-described embodiment, and is not limited to the above-described effects. The present invention can be modified in various ways without departing from the gist of the present invention.

[0093] In the above-mentioned embodiment, the mother glass roll 1A consisting of only the glass film 2 is exemplified, but the present invention is not limited to this structure. The mother glass roll 1A may be a roll-shaped material obtained by overlapping the mother glass film 2 with a strip-shaped buffer film made of a resin such as PET. In this case, in the glass film supplying step, the glass film 2 pulled out from the mother glass roll 1A is separated from the buffer film. The separated buffer film is wound around a separately prepared winding core near the mother glass roll 1A.

[0094] In the above-mentioned embodiment, the structure in which the protective film 3 is adhered to the second surface 2b of the glass film 2 and then wound around the winding core 6 while maintaining the state is illustrated, but the structure is not limited to this. Alternatively, after the protective film 3 is adhered to the second surface 2b of the glass film 2, a strip-shaped buffer film made of a resin such as PET is overlapped (in a non-adherent state) on the first surface 2a side of the glass film 2 and then wound around the winding core 6. In this case, the surface accuracy of the first surface 2a (guaranteed surface) can be more effectively ensured.

[0095] A guide (for example, a strip-shaped resin film) for coupling the glass film 2 to the winding cores 6A, 6 may be connected to the starting end portion and the ending end portion of the strip-shaped glass film 2 .

[0096] Description of Reference Numerals

[0097] 1 Glass Roll

[0098] 2 Glass film

[0099] 3. Protective film

[0100] 4 Adhesive layer

[0101] 5 Laminated Film

[0102] 6 cores

[0103] 7 Manufacturing equipment

[0104] 8 Protective film supply device

[0105] 9 Protective film roll

[0106] 10 Guide roller

[0107] 11 Divider

[0108] 12. Transport device

[0109] 13 Support mechanism

[0110] 14 Supporting member

[0111] 17 Direction conversion unit

[0112] 18 Horizontal transport unit

[0113] 19 Cutting section

[0114] 20 Winding section

[0115] 21 formed body

[0116] 22 Edge Roller

[0117] 23 Annealing furnace

[0118] 24 Annealing roller

[0119] 25 Support roller

[0120] 26 Guide roller

[0121] 27 Laser irradiation device

[0122] 28 Cooling device

[0123] A Width of protective film

[0124] B Width of glass film

[0125] C Width of adhesive layer

[0126] D Width of glass film extending from the adhesive layer

[0127] E The extension width of the protective film from the glass film.

Claims

1. A glass roll, comprising a structure in which a laminated film is wound in a roll shape, wherein the laminated film comprises: a glass film; a protective film; and an adhesive layer disposed between the glass film and the protective film and bonding the glass film to the protective film, The glass roll is characterized in that: The protective film is rolled up and adhered to the outer surface of the glass film via the adhesive layer. The protective film is wider than the glass film, and both ends of the protective film in the width direction extend from the glass film respectively. The glass film is wider than the adhesive layer, and both ends of the glass film in the width direction extend from the adhesive layer respectively.

2. The glass roll according to claim 1, wherein: The width of each end portion of the glass film in the width direction extending from the adhesive layer is 0.1 mm to 10 mm.

3. The glass roll according to claim 1 or 2, wherein: The width of each end portion of the protective film in the width direction extending from the glass film is 1 mm to 100 mm.

4. The glass roll according to claim 1 or 2, wherein: The adhesive layer is a slightly adhesive layer formed on one surface of the protective film.

5. The glass roll according to claim 1 or 2, wherein: The thickness of the adhesive layer is 100 μm or less.

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