JP2010105900A - Glass roll and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass roll of a thin glass sheet in which breakage upon conveyance can be prevented, and to provide a method for producing the same. <P>SOLUTION: The glass roll 1 is characterized in that a thin glass sheet 2 in which scribe lines are formed in the vicinities of the edge parts on both the sides in the width direction, and unnecessary parts on both the edge parts in the width direction are cut away is wound in such a manner that the forming face of the scribe lines may become as the inside. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a glass substrate used for flat panel displays such as liquid crystal displays and organic EL displays, glass substrates for devices such as glass substrates for solar cells, and thin glass sheet glass used for cover glasses for organic EL lighting. The present invention relates to a roll and a manufacturing method thereof.

  From the viewpoint of space saving, instead of the CRT type display which has been widely used in the past, flat panel displays such as a liquid crystal display, a plasma display, an organic EL display, and a field emission display have become popular in recent years. These flat panel displays are required to be thinner. In particular, organic EL displays are required to be easily carried by folding or winding, and to be usable not only on flat surfaces but also on curved surfaces. In addition, it is not limited to a display that can be used not only on a flat surface but also on a curved surface. For example, the surface of an object having a curved surface, such as a car body surface, a roof of a building, a pillar, or an outer wall. If a solar cell can be formed or organic EL illumination can be formed, the application will be expanded. Therefore, the substrate and cover glass used in these devices are required to be further thinned and highly flexible.

  A light emitter used in an organic EL display is deteriorated by contact with a gas such as oxygen or water. Accordingly, since a high gas barrier property is required for a substrate used in an organic EL display, it is expected to use a glass substrate. However, unlike a resin film, glass used for a substrate is weak in tensile stress and thus has low flexibility. If the glass substrate surface is bent to be subjected to tensile stress, the glass substrate is damaged. Generally, when a glass substrate is bent, the tensile stress generated on the surface of the glass substrate becomes smaller as the glass substrate becomes thinner. Therefore, in order to impart flexibility to the glass substrate, it is necessary to perform ultrathinning, and the following patent document 1, a thin glass sheet having a thickness of 200 μm or less has been proposed.

  The glass substrate manufactured by the glass manufacturer is transported to the display panel manufacturer and assembled as a display panel. Therefore, it is necessary to prevent the above-described thin glass sheet from being damaged when transported to a display panel manufacturer.

  As a method for packing a glass substrate, the following Patent Document 2 and the following Patent Document 3 are proposed. Patent Document 2 below describes a packaging method in which a predetermined angle is provided on a pallet having a back surface, glass substrates and packing cushioning materials are alternately stood, and a predetermined number of sheets are stacked and then fixed. Patent Document 3 below describes a packing method in which glass substrates and packing cushioning materials are alternately stacked horizontally on a pallet and fixed with a cushioning material.

  However, since the thin glass sheet has a certain degree of flexibility as described above, it is not easy to stand up as described in Patent Document 2 below, and the following Patent Document 2 is used for packing the thin glass sheet. It is difficult to use the packing method described in. Furthermore, there is a possibility that the thin glass sheet may flutter with a slight wind pressure, and there is a problem that if the glass sheet is bent due to wind pressure or the like when it is stood, it is easily broken.

  Furthermore, the thin glass sheet is very fragile because it is easily deformed due to its thinness. When the thin glass sheets are stacked horizontally as described in Patent Document 3 below, a load is applied to the thin glass sheet existing below. The problem of easy breakage arises.

  As a packing method for preventing a load from being applied downward when packing a glass substrate in the horizontal direction, a method described in Patent Document 4 below has been proposed. In the following Patent Document 4, a plurality of plate glasses are supported by a support member one by one and stored in parallel in the horizontal direction. Therefore, since the load support of the plate glass is performed by the support member, a load is not applied to the glass substrate disposed below.

  However, since a thin glass sheet has flexibility, it cannot be accommodated so as to span between support members as described in Patent Document 4 below.

Therefore, in order to convey a thin glass sheet, it is desired to propose a glass sheet packed by a method fundamentally different from the conventionally used glass substrate packing method.
JP 2008-133174 A JP 2005-231657 A JP 2006-264786 A Japanese Patent Laying-Open No. 2005-75433

  The present invention has been made to solve the above-described problems of the prior art, and provides a glass roll of a thin glass sheet capable of preventing breakage during transportation, and a method for producing the same. With the goal.

  The invention according to claim 1 is such that the scribe line is formed in the vicinity of both end portions in the width direction, and the thin glass sheet from which unnecessary portions at both end portions in the width direction are cut and removed is such that the formation surface of the scribe line is on the inside. It is related with the glass roll characterized by being wound by.

  The invention according to claim 2 relates to the glass roll according to claim 1, wherein the thin glass sheet has a thickness of 10 μm to 500 μm.

  The invention according to claim 3 relates to the glass roll according to claim 1 or 2, wherein the thin glass sheet is formed by an overflow downdraw method.

  The invention according to claim 4 relates to the glass roll according to any one of claims 1 to 3, wherein the thin glass sheet is wound around a packing cushion sheet.

  The invention according to claim 5 relates to the glass roll according to any one of claims 1 to 4, wherein the glass roll is wound by a winding core.

  The invention according to claim 6 relates to the glass roll according to claim 5, wherein the core is removed.

  The invention which concerns on Claim 7 forms a scribe line in the width direction both-ends vicinity of a thin glass sheet, and cuts and removes the unnecessary part of the said width direction both ends, Then, the formation surface of the said scribe line becomes inside It is related with the manufacturing method of the glass roll characterized by winding up.

  The invention according to claim 8 relates to the method for producing a glass roll according to claim 7, wherein the thin glass sheet is formed by an overflow downdraw method.

  According to the first aspect of the present invention, the scribe line is formed in the vicinity of both ends in the width direction, and the thin glass sheet from which unnecessary portions at both ends in the width direction are cut and removed is such that the formation surface of the scribe line is on the inside. Therefore, it is possible to prevent the thin glass sheet from being damaged due to the occurrence of cracks from both end portions of the thin glass sheet. Moreover, even if it hold | maintains for a long time in the state which wound the thin glass sheet, curvature does not generate | occur | produce but it can send in to the following process easily. Furthermore, since it can be made into a long thin glass sheet by winding, it can be subsequently cut at a free length, and can be used for substrates of various sizes. Waste can be prevented. On the other hand, because the formed scribe line groove has fine scratches, when the thin glass sheet is wound so that the scribe line forming surface is on the outside, it is generated in the scribe line groove by the tensile stress. There is a possibility that the thin glass sheet will be damaged by using the fine scratches as the origin.

  According to the invention which concerns on Claim 2, since the thickness of a thin glass sheet is 10 micrometers-500 micrometers, flexibility can be provided to a thin glass sheet appropriately, and when a thin glass sheet is wound up Unreasonable stress applied to the thin glass sheet can be reduced, and the thin glass sheet can be prevented from being damaged.

  According to the invention which concerns on Claim 3, since the thin glass sheet is shape | molded by the overflow downdraw method, the surface does not generate | occur | produce a damage | wound and can obtain the thin glass sheet which has high surface quality. Thereby, at the time of roll-up of a thin glass sheet, it can prevent more reliably that a thin glass sheet is damaged by making the surface damage into an origin.

  According to the invention of claim 4, since the thin glass sheet is wound on the packing cushioning sheet, the packing cushioning sheet has cushioning properties, so even if some impact is applied, the impact is absorbed. It is possible to prevent the thin glass sheet from being damaged. Furthermore, since the glass roll is produced by winding both the thin glass sheet and the packing cushion sheet, it is possible to prevent the surface of the thin glass sheet from being damaged.

  According to the invention which concerns on Claim 5, since it can be fixed to a core when winding a thin glass sheet, since it is wound by the core, it is set as the glass roll wound up more firmly be able to. In addition, even if pressure is applied from the outside to the glass roll of the wound thin glass sheet, the thin glass sheet does not bend inward due to the presence of the winding core, so that unreasonable tensile stress is applied to the thin glass sheet. Can be prevented, and the thin glass sheet can be more reliably prevented from being damaged.

  According to the invention of claim 6, since the core is removed, the glass roll is wound more firmly using the core, and then the weight of the glass roll is reduced by removing the core. Thus, a glass roll more suitable for transportation can be obtained.

  According to the invention which concerns on Claim 7, after forming a scribe line in the width direction both-ends vicinity of a thin glass sheet and cutting and removing the unnecessary part of the width direction both ends, it is so that the formation surface of a scribe line may become inside. Thus, the glass roll can be efficiently produced while preventing the thin glass sheet from being damaged.

  According to the invention which concerns on Claim 8, since it shape | molds by the overflow downdraw method, the shape | molded thin glass sheet has high surface quality, and can be wound up in roll shape more easily.

  Hereinafter, preferred embodiments of a glass roll and a method for producing the same according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a glass roll according to the present invention. FIG. 2 is an explanatory diagram of a thin glass sheet manufacturing apparatus. FIG. 3 is an explanatory diagram of a glass roll manufacturing apparatus according to the present invention. FIG. 4 is a view of a form in which a holding portion is provided on the core, where (a) is a view of a form that holds only a thin glass sheet, and (b) is a form that holds a thin glass sheet and a packing cushion sheet. FIG. FIG. 5 is a diagram of a form in which the outer cylinder of the winding core expands and contracts. 6A and 6B are diagrams showing a preferable cutting method for a thin glass sheet according to the present invention, in which FIG. 6A shows a state in which the scribe line has passed the pre-cutting roller, and FIG. 6B shows folding. FIG. 4C is a view showing a state in which the rear end portion has passed the post-cutting roller.

  The glass roll (1) according to the present invention has a scribe line formed to remove unnecessary portions such as a roller contact portion after forming with a glass roll manufacturing apparatus shown in FIG. It is produced by winding up so that.

  Silicate glass is used for the thin glass sheet (2), preferably silica glass or borosilicate glass is used, and most preferably non-alkali glass is used. If the thin glass sheet (2) contains alkali, cation substitution occurs on the surface, so-called soda blowing phenomenon occurs, and the structure becomes rough. In this case, when the thin glass sheet (2) is curved and used, it may be easily damaged from a portion roughened due to aging. Here, the alkali-free glass is a glass that is substantially free of alkali, and specifically, a glass having an alkali content of 1000 ppm or less. In the present invention, the alkali content is preferably 500 ppm or less, more preferably 300 ppm or less.

  Since the thin glass sheet (2) can be wound up, it is particularly suitable for long objects. That is, the length (long side) of the thin glass sheet (2) with respect to the width (short side) is preferably 3 times or more, more preferably 5 times or more, and even more preferably 10 times or more. Thus, even if it is a long object, it can be packed compactly and is suitable for transportation. The width of the thin glass sheet (2) is appropriately selected depending on the size of the substrate of the device used, such as a small display for a mobile phone or a large screen display.

  The thickness of the thin glass sheet (2) is preferably 10 μm to 500 μm, more preferably 10 μm to 200 μm, and most preferably 10 μm to 100 μm. If it does in this way, flexibility can be given to a thin glass sheet (2) appropriately, and the unreasonable stress concerning a thin glass sheet (2) when a thin glass sheet (2) is wound up is reduced. This is because the thin glass sheet (2) can be prevented from being damaged. When the thickness of the thin glass sheet (2) is less than 10 μm, the strength of the thin glass sheet (2) is insufficient. On the other hand, when the thickness exceeds 500 μm, the thin glass sheet (2) is damaged by tensile stress. In any case, the possibility increases, which is not preferable.

  Since the thin glass sheet (2) needs to be tensioned in the width direction at the time of forming from its thinness, the pulling marks (roller contact portions) due to the cooling roller (5) remain at both end portions in the width direction. . The roller contact portion is thicker than the other portion of the thin glass sheet (2), and if the portion remains, it becomes difficult to wind up in a roll shape, and thus the roller contact portion becomes an unnecessary portion. Therefore, before the thin glass sheet (2) is used as the take-up glass roll (1), it is necessary to cut and remove unnecessary portions (roller contact portions) of the thin glass sheet (2). When removing the unnecessary part (roller contact part) of the thin glass sheet (2), use a diamond cutter or the like to place a scribe line on the surface of the thin glass sheet (2) in the flow direction of the thin glass sheet (2). Form and fold. Then, a thin glass sheet (2) is wound up so that the formation surface of a scribe line may become inside. Since the formed scribe line groove has fine scratches, when the thin glass sheet (2) is wound so that the scribe line forming surface is on the outside, it is generated in the scribe line groove by the tensile stress. This is because there is a possibility that the thin glass sheet (2) may be damaged by using the fine scratches as the origin. In addition, after the scribe line is formed, the end face of the thin glass sheet (2) can be processed by performing fire polishing and chemical polishing.

  When the thin glass sheet (2) is wound, stress concentrates on the end surface of the thin glass sheet (2) and may be damaged. Therefore, it is preferable to protect the end surface portion of the thin glass sheet (2) with a resin film or the like. In this case, a glass roll (1) is created by stacking and winding up a resin film in an area of 1 to 2 cm from both end faces of the thin glass sheet (2). Furthermore, when an adhesive resin film is used, even if a crack occurs on the end surface of the thin glass sheet (2), it is possible to prevent the crack from progressing. Further, instead of protecting the end surface of the thin glass sheet (2) with a resin film, a protective film may be coated in an area of 1 to 2 cm from both end surfaces. Examples of the protective film include polyester, polycarbonate, polyvinyl, polyethylene polyetherimide, polyamide, polyacrylate, polymethacrylate, polysiloxane, polyvinyl alcohol, polyvinyl acetate, cellulose base polymer, epoxy resin, polyurethane, phenol resin, and melamine. Resin, urea resin, etc. can be used. These protective films can be applied by spray application, application by a roller or the like, or adhesion of the above-described resin film. The protective film is not limited to an area of about 1 to 2 cm from the end surface of the thin glass sheet (2), and the same effect can be obtained even if it is formed over the entire surface of the thin glass sheet (2). .

  When the thin glass sheet (2) is pulled out from the glass roll (1) and incorporated into the process, if the thin glass sheet (2) is directly gripped and incorporated, the starting end of the thin glass sheet (2) may be damaged. , It may be difficult to incorporate into the process. Therefore, it is preferable to attach a resin film at the start (starting end) and the end (ending) of winding of the thin glass sheet (2). Since the resin film is richer in toughness than the thin glass sheet (2) and is not easily damaged, the resin film can be gripped when incorporated into the process, which facilitates incorporation into the process. It becomes possible. The resin-made film is wound on the glass sheet (1) after being attached after being overlapped by about 1 to 2 cm on the start and end parts of the thin glass sheet (2). The length of the resin film is not particularly limited, and for example, it may be set to a length corresponding to one circumference of the glass roll (1). Moreover, it is preferable that resin-made films have adhesiveness, and it is preferable that an elasticity modulus is smaller than a thin glass sheet (2).

  A thin glass sheet (2) is manufactured using the manufacturing apparatus shown in FIG. The glass ribbon (G) immediately after flowing down from the lower end (41) of the wedge-shaped molded body (4) is stretched downward while the shrinkage in the width direction is regulated by the cooling roller (5) to a predetermined thickness. Until it gets thinner. Next, the glass ribbon (G) having reached the predetermined thickness is gradually cooled in a slow cooling furnace (annealer) to remove the thermal strain of the glass ribbon (G), thereby forming a thin glass sheet (2).

  The glass roll (1) based on this invention is manufactured using the manufacturing apparatus shown in FIG. A thin glass sheet (2) (for example, OA-10G manufactured by Nippon Electric Glass Co., Ltd .: thickness 50 μm) formed by the method described in [0037] using the apparatus shown in FIG. In order to remove the roller contact portion that has come into contact with the roller, the scribe line is continuously formed by the roller contact portion cutting cutter (7) with a predetermined width from both ends of the glass ribbon (G) in the plate width direction. Is removed. Then, a thin glass sheet (2) is wound up in a roll shape so that the formation surface of the scribe line is on the inside. Thus, after winding the thin glass sheet (2) to the size of a predetermined diameter, the scribe line was formed in the width direction of the thin glass sheet (2) by using the width direction cutting cutter (illustration omitted). The production of the glass roll (1) according to the present invention is completed by cutting and winding the rear thin glass sheet (2).

  In addition, in FIG. 3, although the form of the winding of the long thing performed continuously from shaping | molding to winding was demonstrated, when winding a short thing, a thin glass sheet | seat (For every predetermined length previously) It is good also as a winding form in a batch process by cutting after forming a scribe line in the width direction of 2). A plurality of short objects may be wound around one glass roll.

  In the present invention, the thin glass sheet (2) is preferably formed by the overflow down draw method as shown in FIGS. The overflow down draw method is a molding method in which both sides of the glass plate do not come into contact with the molded member during molding, and both surfaces (translucent surface) of the obtained glass substrate are hardly damaged and have a high surface without being polished. This is because quality can be obtained.

  In the glass roll (1) according to the present invention, it is preferable that the thin glass sheet (2) is wound around the packing cushion sheet (3). When the packaging buffer sheet (3) winds up the thin glass sheet (2), it prevents the thin glass sheet (2) from coming into contact with each other, and an external pressure is applied to the glass roll (1). This is because it can be absorbed.

  The thickness of the packing cushion sheet (3) is preferably 10 μm to 2000 μm. If it is less than 10 μm, it cannot have sufficient cushioning properties as a packing buffer sheet, and if it exceeds 2000 μm, the thickness of the glass roll formed after winding the thin glass sheet (2) becomes unreasonably thick. In either case, it is not preferable.

  When producing the glass roll (1) according to the present invention, the thin glass sheet (2) may exceed 50 ° C, so that the packing buffer sheet (3) is softened and deteriorated at around 100 ° C. Preferably not.

  The packing buffer sheet (3) is preferably slightly larger than the thin glass sheet (2) in the width direction. This is to prevent the side edge of the thin glass sheet (2) from being chipped due to impact or the like.

  As the packing buffer sheet (3), ionomer film, polyethylene film, polypropylene film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, polypropylene film, polyester film, polycarbonate film, polystyrene film, polyacrylonitrile film, ethylene acetate A vinyl copolymer film, an ethylene-vinyl alcohol copolymer film, an ethylene-methacrylic acid copolymer film, a nylon film, a resin cushioning material such as cellophane, a slip sheet, a nonwoven fabric, and the like can be used. Among them, polyester films, particularly polyethylene terephthalate films, have good slippage against glass, so that winding is caused by a slight difference in diameter caused by stacking and winding the thin glass sheet (2) and the packing cushion sheet (3). This is preferable because the shift in length can be absorbed by the slip. Furthermore, when a sheet made of polyethylene foam resin is used as the packing cushion sheet (3), shock absorption is possible, and the displacement of the thin glass sheet (2) during winding can be absorbed by the expansion and contraction of the resinous sheet. Therefore, it is preferable.

  Further, even if the thin glass sheet (2) is wound so that the packing cushioning sheet (3) is on the outside, the thin glass sheet (2) is wound on the glass cushion so that the packing cushioning sheet (3) is on the inner side. (1) may be formed. When winding the thin glass sheet (2) so that the packing buffer sheet (3) is on the inside, the thin glass sheet (2) is fixed to the packing buffer sheet (3) with a tape or the like, or as shown in FIG. As above, hold the thin glass sheet (2) and the packing cushion sheet (3) in the holding groove (68) provided on the core (6), or start winding after holding only the thin glass sheet (2). To do.

  The packing buffer sheet (3) is preferably provided with conductivity. In this way, when the thin glass sheet (2) is taken out from the glass roll (1), peeling electrification hardly occurs between the thin glass sheet (2) and the packing cushion sheet (3). This is because 2) and the packing cushion sheet (3) can be easily peeled off. When packing cushioning sheet (3) is made of resin, add conductive components such as polyethylene glycol to packing cushioning sheet (3). The packing buffer sheet (3) can be provided with conductivity. Moreover, in order to provide electroconductivity, electrically conductive films, such as ITO, can also be formed in the surface of a packing buffer sheet (3).

  The glass roll (1) according to the present invention is preferably wound around the core (6). This is because when the thin glass sheet (2) is taken up, it can be fixed to the core (6), so that the glass roll (1) taken up more firmly can be obtained. Even if pressure is applied to the glass roll (1) of the wound thin glass sheet (2) from the outside, the thin glass sheet (2) is not bent inward due to the presence of the winding core (6). It is possible to prevent unreasonable tensile stress from being generated in the glass sheet (2), and it is possible to more reliably prevent the thin glass sheet (2) from being damaged.

  The winding core (6) is preferably larger than the thin glass sheet (2) in the width direction. If it does in this way, a core (6) can be made to project rather than a side edge part of a glass roll (1), and a chipping of a side edge part of a thin glass sheet (2) by hitting etc. can be prevented. Because.

  The material of the core (6) includes metals such as aluminum alloy, stainless steel, manganese steel, and carbon steel, phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, polyurethane, direal terephthalate resin, etc. Thermosetting resin, polyethylene, polypropylene, polystyrene, AS resin, ABS resin, methacrylic resin, vinyl chloride, or other thermoplastic resins, or glass fiber or carbon fiber reinforced fibers such as these thermosetting resins or thermoplastic resins Mixed reinforced plastics, paper tubes, etc. can be used. Among these, aluminum alloys and reinforced plastics are excellent in terms of strength, and paper can be reduced in weight, so that it can be preferably used.

  In order to prevent the surface of the thin glass sheet (2) from being damaged, it is preferable that the packing cushion sheet (3) is wound around the core (6) in advance for one round or more.

  When starting to wind the thin glass sheet (2) around the core (6), it is difficult to align the end of the thin glass sheet (2) at the beginning of the winding with the core (6). An undue stress is applied to the winding start portion of the end portion, which may cause damage. Therefore, it is preferable that the winding core (6) is provided with a holding groove (68) for holding the end portion of the thin glass sheet (2) as shown in FIG. In this case, as shown to Fig.4 (a), a holding groove (68) is formed with a buffer material (69), the edge part of a thin glass sheet (2) is inserted, and winding-up is started. On the other hand, in the case where the thin glass sheet (2) is wound on the packing cushion sheet (3), as shown in FIG. 4 (b), the end of the thin glass sheet (2) is placed on the packing cushion sheet (3). ) In a state of being folded and covered, the sheet glass sheet (2) may be wound up after being simultaneously inserted into the holding groove (68).

  The glass roll (1) according to the present invention is more preferably removed from the core (6) after being wound by the core (6). That is, when the thin glass sheet (2) is wound up, the glass roll (1) is temporarily fixed to the core (6) and wound more firmly, and then the core (6) is removed to remove the glass roll. This is because the weight of (1) can be reduced and the glass roll (1) can be made more suitable for transportation.

  When removing the core (6), as shown in FIG. 5, the core (6) consists of a concentric double circular sleeve of an inner cylinder (65) and an outer cylinder (66). It is preferable to use one in which an elastic member (67) is interposed between the cylinders (66). By pressing the outer cylinder (66) in the center direction, the elastic member (67) contracts, so that the outer cylinder (66) is reduced in diameter, so that the core (6) can be easily removed from the glass roll (1). This is because it can be removed. In FIG. 5, the elastic member (67) is used as a member for expanding and contracting the outer cylinder (66). However, the space between the inner cylinder (65) and the outer cylinder (66) is sealed, and the fluid in the inner space is sealed. It is also possible to adopt a configuration in which the outer cylinder (66) is expanded and contracted by changing the pressure.

  The tensile stress generated on the surface of the thin glass sheet (2) when the thin glass sheet (2) is wound up to form a glass roll (1) is determined by the following equation (1).

  In Equation 1, σ represents the tensile stress value of the thin glass sheet (2), R represents the radius of the inner diameter of the glass roll (1) (radius of the outer diameter of the core), and T represents the thin glass sheet ( 2) indicates the thickness, and E indicates the Young's modulus of the thin glass sheet (2).

  Accordingly, the radius R of the inner diameter of the glass roll (1) (the radius of the core 6) is determined by the following equation (2).

  In Equation 2, σ represents the tensile stress value of the thin glass sheet (2), R represents the radius of the inner diameter of the glass roll (1) (radius of the outer diameter of the core), and T represents the thin glass sheet ( 2) indicates the thickness, and E indicates the Young's modulus of the thin glass sheet (2).

  By setting the radius R of the inner diameter of the glass roll (1) to be equal to or greater than the value of the radius determined by the above equation 2, it is possible to more appropriately select the winding radius when winding the thin glass sheet (2). It is possible to prevent the thin glass sheet (2) from being damaged because it is possible to prevent the thin glass sheet (2) from being improperly pulled by the take-up radius being too low. it can. In addition, what is necessary is just to set the radius of the outer diameter of a core (6) more than the value calculated | required by Formula 2 mentioned above when using a core (6). For example, when a thin glass sheet (2) having a thickness of 300 μm is wound, if the tensile stress generated on the surface of the thin glass sheet (2) is about 21 MPa, it can be wound on a core having a diameter of 1 m.

  When a diamond cutter is used in the formation of the scribe line, the value of σ in Equation 2 described above is determined from the value of the inner diameter (S) (core diameter) of the glass roll (1) based on 30 to 60 MPa. Considering that the tensile stress due to strain at the time of cooling is added to the tensile stress due to the shape at the end face when the molten glass is formed into a thin glass sheet (2), the value of σ described above is It is safe to use up to 30 MPa.

  The specific Young's modulus of the thin glass sheet (2) is preferably 29 or more and 40 or less, and more preferably 29 or more and 35 or less. The specific Young's modulus is obtained by dividing the Young's modulus by the specific gravity and is a measure of the amount of deflection under its own weight. The thin glass sheet (2) is subjected to a roll-to-roll type continuous treatment, and is cut into a predetermined size for use at the final stage. Since the plate glass cut at this time is thin and highly flexible, if the specific Young's modulus is less than 29, it will bend more than necessary in the process after cutting, which may induce trouble in the process, It is required to have a predetermined specific Young's modulus. On the other hand, if the specific Young's modulus of the thin glass sheet (2) exceeds 40, the thin glass sheet (2) becomes difficult to bend, so that it is difficult to form the glass roll (1).

  Since the thin glass sheet (2) is rich in flexibility due to its thinness, it is difficult to be folded in the width direction by a normal method, and it is difficult to be folded in the width direction by the method shown in FIG. Preferably it is done. The thin glass sheet (2) is conveyed as it is after the scribe line (75) is formed in the width direction by the width direction cutting cutter (74), and the roller (71) before cutting is moved as shown in FIG. A scribe line (75) passes. Thereafter, as shown in FIG. 6 (b), the rotational speed of the post-cutting roller (73) and the winding speed of the glass roll (1) are made lower than the rotational speed of the pre-cutting roller (71), and the cutting roller (72). Is lifted from the conveying line by a driving means (not shown) to bend the thin glass sheet (2) into a U-shape, and the scribe line (75) is at the apex of the character directly above the cutting roller (72). When it comes, it is folded by the stress concentration. Thereafter, the cutting roller (72) is lowered and, as shown in FIG. 6 (c), after the cut end passes through the post-cutting roller (73), the winding speed of the glass roll (1) is increased and the winding is performed. At the same time, the glass roll (1) and the core (6) are exchanged, and then the treatment is continuously performed.

  FIG. 7 is a perspective view in which an exterior body is provided on a glass roll according to the present invention. FIG. 8 is a perspective view in which a shaft is provided on the core of the glass roll according to the present invention. FIG. 9 is a perspective view in which a flange is provided on the core of the glass roll according to the present invention. FIG. 10 is an explanatory view showing a method of placing the glass roll according to the present invention in the vertical direction.

  A glass substrate for a display such as a liquid crystal display or an organic EL display is required to be a clean glass free from adhesion of dust and dirt due to its use. Therefore, as shown in FIG. 7, a clean state can be maintained by providing a cylindrical exterior body (8) and replacing the internal gas with a clean one. Further, a lid on a flat plate can be caulked and fastened to a cylindrical body in a clean room, and sealed in a canned shape. Furthermore, a clean state can also be maintained by packaging the glass roll (1) with a shrink film in a clean room.

  When the glass roll (1) according to the present invention is placed in the lateral direction, particularly when the thin glass sheet (2) is a long object, the glass roll (1) is damaged by its own weight from the placement surface side. Therefore, in order to prevent the thin glass sheet (2) wound around the glass roll (1) from directly contacting the mounting surface, the shaft (61) is provided on the core (6) as shown in FIG. It is preferable to arrange on a pedestal (63) having (62). Furthermore, after arrange | positioning a glass roll (1) on a base (63), it is preferable to cover the whole with the packaging box which is not shown in figure. This is because a clean state can be maintained by replacing the inside of the packaging box with clean air. The form which has a packaging box for every glass roll (1) single-piece | unit may be sufficient, and the form which packs a several glass roll (1) simultaneously in one packaging box may be sufficient. In addition, the base (63) is fixed in the packaging box, and the shaft (61) of the glass roll (1) is suspended by a crane or the like, so that the glass roll (1) is taken in and out of the packaging box. Therefore, since the pedestal (63) is firmly fixed in the packaging box during transportation, the safety is excellent.

  As shown in FIG. 9, it is preferable to provide flanges (64) at both ends of the core (6) so that the thin glass sheet (2) does not directly contact the placement surface. This is to prevent the thin glass sheet (2) wound around the glass roll (1) from directly contacting the placement surface. Although the shape of the flange of FIG. 9 is circular, when it is made polygonal, it can prevent that a glass roll (1) rolls, when it mounts on a floor surface. The flange (64) may be detachable from the core (6). In this case, only the core (6) is used during winding and rewinding, and a flange (64) is attached to protect the thin glass sheet (2) during transportation and storage.

  When the thin glass sheet (2) is displaced on the core (6) during transportation or the like, the end surface of the thin glass sheet (2) and the flange may come into contact with each other and break. Therefore, in the case of the form having this flange (64), the glass roll (1) is produced by stacking and winding the thin glass sheet (2) on the packing buffer sheet (3), and the width of the packing buffer sheet (3). Is preferably wider than the width of the thin glass sheet (2). If the width of the packing cushion sheet (3) is wide, even if the thin glass sheet (2) is displaced on the core (6), the end surface does not directly contact the flange (64), and the thin glass sheet (2 This is because it is possible to prevent the occurrence of damage. The inner surface of the flange (64) is also preferably protected by a member having a buffering action.

  As described above, when the glass roll (1) according to the present invention is placed in the horizontal direction, the glass roll (1) is damaged by its own weight. Therefore, in order to prevent the thin glass sheet (2) wound on the glass roll (1) from directly contacting the mounting surface, the glass roll (1) is utilized by using the packing device (9) shown in FIG. Are preferably placed in the vertical direction. The packing device (9) includes a base part (91) and a columnar part (92) standing on the base part (91). As shown in FIG. 10, the glass roll (1) is placed on the base (91) in the vertical direction so that the columnar part (92) is inserted into the core (6) of the glass roll (1). Thereby, even if a glass roll (1) shakes in the case of transportation, since a glass roll (1) is fixed by the columnar part (92), the thin glass sheet (2 which originates in glass rolls colliding) ) Can be prevented.

  The columnar part (92) is preferably detachable from the base part (91). By making it detachable, the glass roll (1) can be easily loaded and unloaded. When the glass roll (1) is placed, the columnar portions (92) are erected at intervals such that the glass rolls (1) do not collide with each other. In order to prevent vibration during transportation, a buffer material may be filled between the glass rolls (1). The base part (92) is preferably provided with a hole for a forklift. Further, by providing a box (not shown), it becomes possible to package more strictly.

  FIG. 11 is a view showing a glass roll processing method according to the present invention. FIG. 12 is a view showing another processing method of the glass roll according to the present invention. FIG. 13 is a view of a packing cushioning sheet whose surface is embossed.

  When performing processing such as cleaning and drying of the glass substrate, the conventional rectangular glass substrate could only be conveyed individually one by one, but the glass roll (1) according to the present invention is a roll.・ Continuous processing can be performed in a two-roll system. For example, the cleaning step (110), the drying step (111), and the charge removal step (112) can be successively performed by a roll-to-roll method by the method shown in FIG. Since the thin glass sheet (2) has flexibility, it can be immersed in a cleaning tank in the cleaning step (110). When the roll-to-roll type continuous treatment is performed on the glass roll (1) according to the present invention, it is preferable that the glass roll (1) is erected as shown in FIG. Since the thin glass sheet (2) has higher rigidity than the resin film, the roll-to-roll method can be performed in a state where the sheet is erected. When it is carried out in an upright state, it is easy to drain water after completion of the cleaning process, and the transport roller (113) and the surface of the thin glass sheet (2) do not come into contact with each other. In addition, in the processing method of FIG. 12, when the thin glass sheet (2) flutters, you may make it support the upper part of a thin glass sheet (2) by providing the conveyance roller which is not illustrated suitably.

  At this time, when the glass roll (1) that is insufficiently dried after washing is used in a process that hates moisture extremely, it is necessary to remove the moisture adsorbed on the glass surface before use. Before putting (1), it is necessary to dry sufficiently in a roll state. In this case, a glass roll (1) is produced by stacking and winding the thin glass sheet (2) on the packaging cushioning sheet (3), and embossing is performed as the packaging cushioning sheet (3) as shown in FIG. It is preferable to use a packing cushion sheet (3) having irregularities formed on the surface by such means. This is because the entire surface of the packing buffer sheet (3) does not come into contact with the thin glass sheet (2), so that it has excellent air permeability and can be more easily dried. Moreover, it is preferable that the core (6) has a structure excellent in air permeability by providing holes, slits, and meshes. In addition, it is preferable that a hollow portion is provided in the core (6), a heater is disposed therein, and drying is performed by heating from the inside of the core (6). After drying, the glass roll (1) can be sealed in, for example, the exterior body shown in FIG. 7, and a dry state can be maintained by putting a desiccant or the like inside. Moreover, it is also possible to provide a sheet-like desiccant (such as a silica gel-containing sheet) on the end face of the glass roll (1) and cover it with a moisture-proof film (such as a metal film deposited film).

  The present invention can be suitably used for glass substrates used in flat panel displays such as liquid crystal displays and organic EL displays, devices such as solar cells, and cover glasses for organic EL lighting.

It is a perspective view of the glass roll which concerns on this invention. It is explanatory drawing of the manufacturing apparatus of a thin glass sheet. It is explanatory drawing of the manufacturing apparatus of the glass roll which concerns on this invention. It is a figure of the form which provided the holding part in the core, Comprising: (a) is a figure of the form which hold | maintains only a thin glass sheet, (b) is a figure of the form which hold | maintains a thin glass sheet and a packing buffer sheet. . It is a figure of the form which the outer cylinder of a winding core expands / contracts. It is the figure which showed the preferable cutting method of the sheet glass sheet which concerns on this invention, Comprising: (a) is a figure of the state through which the scribe line passed the pre-cutting roller, (b) is the figure which has performed folding, (c) ) Is a view of a state in which the rear end of the cut has passed the post-cut roller. It is the perspective view which provided the exterior body in the glass roll which concerns on this invention. It is the perspective view which provided the axis | shaft in the core of the glass roll which concerns on this invention. It is the perspective view which provided the flange in the core of the glass roll which concerns on this invention. It is explanatory drawing which shows the method of mounting the glass roll which concerns on this invention in the vertical direction. It is the figure which showed the processing method of the glass roll which concerns on this invention. It is the figure shown about the other processing method of the glass roll which concerns on this invention. It is a figure of the packing buffer sheet which gave the surface the embossing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass roll 2 Thin glass sheet 3 Packing buffer sheet 4 Molded body 5 Cooling roller 6 Winding core 70 Roller contact part cutting cutter

Claims (8)

  A scribe line is formed in the vicinity of both ends in the width direction, and the thin glass sheet from which unnecessary portions at both ends in the width direction are cut and removed is wound so that the formation surface of the scribe line is on the inside. Characteristic glass roll.   The glass roll according to claim 1, wherein the thin glass sheet has a thickness of 10 μm to 500 μm.   The glass roll according to claim 1 or 2, wherein the thin glass sheet is formed by an overflow down draw method.   The glass roll according to any one of claims 1 to 3, wherein the thin glass sheet is wound on a packing cushion sheet.   The glass roll according to any one of claims 1 to 4, wherein the glass roll is wound by a winding core.   The glass roll according to claim 5, wherein the core is removed.   A scribe line is formed in the vicinity of both ends in the width direction of the thin glass sheet, and unnecessary portions at both ends in the width direction are cut and removed, and then wound so that the formation surface of the scribe line is inside. Manufacturing method of glass roll.   The method for producing a glass roll according to claim 7, wherein the thin glass sheet is formed by an overflow downdraw method.