JP2011207721A - Method for cutting glass film, and method for production of glass roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously achieve improvement in handleability of damageable glass film and facilitation of cutting both ends of the glass film in a width direction.SOLUTION: The method for cutting a glass film includes: sticking a resin film 6 only to an effective part Ga being an across-the-width central portion except the ineffective parts Gb of both ends in the width direction in both surface and rear of the glass film G; and then cutting the ineffective parts Gb of the glass film G on which the resin film 6 is not stuck in such a state as to protect the effective part Ga of the glass film G with the resin film 6.

Description

  TECHNICAL FIELD The present invention relates to a glass roll manufacturing technique in which a glass film is wound into a roll, and more particularly to an improvement in the technique for cutting both ends in the width direction of the glass film in the glass roll manufacturing process.

  As is well known, from the viewpoint of space saving, instead of the CRT type display which has been widely used in the past, in recent years, flat panel displays (FPD) such as liquid crystal displays, plasma displays, organic EL displays and field emission displays have become popular. ing. These FPD glass substrates are required to be further thinned from the viewpoint of weight reduction and the like. In particular, organic EL displays are expected to be easy to carry by folding and winding, and can be used not only on flat surfaces but also on curved surfaces. In fact, in order to ensure high flexibility, the actual situation is that there is a strong demand for thinner plates.

  Also, for example, in the field of solar cells and organic EL lighting, it is expected to be usable not only on flat surfaces but also on curved surfaces. This means that if solar cells and organic EL lighting can be formed on the surface of an object with curved surfaces, such as the surface of an automobile body or the roof, pillar, or outer wall of a building, its use and convenience will be greatly expanded. It is to become. Accordingly, the substrates and cover glasses used in these devices are also required to be thin from the viewpoint of ensuring high flexibility.

  Accordingly, in response to these requests for thinning, for example, as disclosed in Patent Document 1, film-like thin glass whose thickness has been advanced to 200 μm (hereinafter, film-like thin glass is referred to as a glass film). .) Has been developed.

  However, the thinned glass film is liable to be damaged such as cracks, and when applied as it is as a glass substrate of a device such as an FPD or a solar cell, the film-attaching process such as a transparent electrode or a cleaning process is performed. There is a possibility that breakage may occur in various manufacturing-related processes, and there is a problem that handling is very poor.

  Therefore, for example, Patent Document 2 discloses that a resin layer is formed on at least one entire surface of a glass film for the purpose of improving the handleability of the glass film. If it does in this way, since a glass film is protected by a resin layer, in the various manufacture related processes mentioned above, handling property improves compared with the case where processing is carried out with a glass film alone.

  In this document, after a resin layer is formed on a long glass film continuously formed by the overflow down draw method, the long glass film on which the resin layer is formed is wound using its flexibility. The roll is wound around the core and accommodated.

JP 2008-133174 A WO2009 / 057460

  By the way, the glass film is usually formed by one of the downdraw method and the float method. In these two forming methods, the molten glass is thinly drawn into a plate shape, and rollers (on both ends in the width direction of the molten glass are prevented so that the molten glass does not shrink below a certain width during the forming process. In the downdraw method, it is called an edge roll, and in the float method, it is called a top roll. And due to this common point, both ends in the width direction of the glass film formed by these forming methods are referred to as ears that are relatively thicker than the central portion in the width direction due to the contact of the rollers. Part is formed.

  Since this ear | edge part is relatively thick and its flatness is also bad, it cannot become a product part. In addition, if the ear portion remains, when the glass film is wound into a roll shape and accommodated in the state of the glass roll, there is a problem that the winding radius is unduly enlarged due to the thickness of the ear portion. obtain. Therefore, it is necessary to cut and remove the ear part finally.

  However, as disclosed in Patent Document 2, when a resin layer is formed on at least one surface of the glass film, it is extremely difficult to cut both end portions in the width direction where the ear portions are formed. .

  That is, in this case, both ends in the width direction of the glass film to be cut are also covered with the resin layer, so that it is necessary to cut the glass film and the resin layer at the same time. Cutting together with the film is technically difficult. In addition, if the resin layer is forcibly cut, an excessive stress acts on the glass film to which the resin layer is bonded, and the glass film that can be a product may be damaged in the center in the width direction.

  In addition, the problem that occurs when the resin layer is formed on the entire surface in this way is not limited to the cutting of the ear part, but in order to adjust the width direction dimension of the molded glass film to the required dimension, both ends in the width direction are cut. This can occur in the same way.

  This invention makes it a technical subject to achieve simultaneously the improvement of the handleability of the glass film which is easy to be damaged, and the easy cutting | disconnection of the both ends of the width direction of the glass film.

  1st invention created in order to solve the said subject is the cutting method of the glass film which cut | disconnects the width direction both ends of a glass film, Comprising: The width direction both ends of the surface of the at least one side of the front and back of a glass film It is characterized by cutting both ends in the width direction of the glass film in which the resin layer is not formed in a state where the resin layer is formed only in the central portion in the width direction excluding the portion.

  According to such a method, since the center part in the width direction of the glass film that can be a product is reliably protected by the resin layer, the handling property of the glass film can be improved.

  Furthermore, since this resin layer is formed only at the center in the width direction of the glass film, the glass surface is exposed at both ends in the width direction of the glass film without forming the resin layer. Therefore, when cutting both ends in the width direction of the glass film, it is not necessary to cut the resin layer, and it is sufficient to cut only the glass layer. Therefore, both ends in the width direction of the glass film can be easily and reliably cut while preventing a defect such as a crack from progressing toward the width direction center of the glass film that can be a product.

  In addition, if it does as mentioned above, since it is not necessary to form a resin layer in the width direction both ends of the glass film cut | disconnected and removed, the secondary effect that a resin layer can be saved can also be enjoyed.

  The 2nd invention created in order to solve the above-mentioned subject is a glass roll which winds the glass film which cut | disconnected the width direction both ends of the glass film, and cut | disconnected the width direction both ends in roll shape, In the manufacturing method of a glass roll provided with a winding step, a resin layer is formed only in the center in the width direction excluding both ends in the width direction of at least one side of the front and back surfaces of the glass film before the cutting step. In the cutting process, the width direction both ends of the glass film in which the resin layer is not formed are protected in the state where the width direction center of the glass film is protected by the resin layer. Characterized.

  According to such a method, it is possible to stably manufacture the glass roll while enjoying the same effects as those of the first invention described above.

  Said method WHEREIN: It is preferable that the said resin layer is formed by sticking a resin film on a glass film.

  If it does in this way, a resin layer can be formed easily and reliably only in the width direction center part of a glass film.

  In said method, you may perform the process including the said protection process process, the said cutting process, and the said winding process on the conveyance path | route, conveying a glass film continuously.

  If it does in this way, since various processes will be given to the glass film in order only by conveying a glass film, the manufacturing efficiency of a glass roll can be maintained favorably.

  Said method WHEREIN: It is preferable that the said resin layer is formed in the surface of the side which contacts the conveyance means located on the conveyance path | route of the glass film after the said protection treatment process among the front and back of a glass film.

  In this way, since the resin layer is interposed between the central portion in the width direction of the glass film and the conveying means, there is an advantage that damage such as scratches hardly occurs in the central portion in the width direction of the glass film. is there.

  In said method, the width direction of the said resin layer is cut | disconnected to the glass film after cut | disconnecting the width direction both ends of the glass film in the said cutting process in the position spaced apart from the width direction both end surfaces of the said resin layer at both sides. Forming a protruding portion that protrudes from both end surfaces, and when winding the glass film into a roll in the winding step, the protruding portion of the glass film is positioned at both end surfaces in the width direction of the resin layer. It is preferable that they are separated in the stacking direction through the side space.

  In this way, in the state of the glass roll, the protruding portion of the glass film is separated in the laminating direction via the lateral spaces on both end faces in the width direction of the resin layer. However, the protruding portions of the glass film are not pressed against each other. Therefore, excessive stress does not act on the end surface in the width direction of the protruding portion constituted by the cut surface, and it is possible to reliably reduce the situation in which the glass film is damaged in the state of the glass roll.

  In the above method, the glass film is preferably formed by a float method or a downdraw method. The downdraw method includes an overflow downdraw method, a redraw method, and a slot downdraw method.

  In this way, relatively thick ears are formed at both end portions in the width direction of the glass film. As described above, the ear portions are formed by resin layers in the center in the width direction of the glass film. If protected, it can be cut and removed without problems. Therefore, since the drawbacks of the float method and the downdraw method in which the ears are formed can be solved without problems, the advantage that these two molding methods can produce a large amount of glass film in a short time is sufficiently exhibited. Can do. In particular, in the case of molding by the overflow downdraw method included in the downdraw method, in addition to the advantages, an advantage that a glass film excellent in surface quality can be easily formed is preferable.

  In said method, it is preferable that the thickness of the center part of the width direction of the glass film before the said cutting process is 5-300 micrometers.

  That is, when the thickness of the glass film is less than 5 μm, it is difficult to form the glass film, and when it exceeds 300 μm, it is difficult to wind the glass film into a roll. Therefore, the thickness of the glass film is preferably within the above numerical range from the viewpoint of ensuring moldability and ease of winding.

  As described above, according to the present invention, since the resin layer is formed only in the center portion in the width direction excluding both end portions in the width direction of the glass film, the both end portions in the width direction to be cut are formed on the glass surface without forming the resin layer. Will be exposed. Therefore, the resin layer that protects the central portion in the width direction of the glass film does not adversely affect the cutting at both ends in the width direction. Therefore, it is possible to easily cut the both ends in the width direction of the glass film while improving the handleability of the glass film which is easily damaged by the resin layer.

It is a schematic side view which shows the manufacturing apparatus for embodying the manufacturing method of the glass roll which concerns on 1st Embodiment of this invention. It is AA sectional drawing of FIG. 1, Comprising: It is a figure which shows the state which formed the resin layer in the glass film. It is BB sectional drawing of FIG. 1, Comprising: It is a figure which shows the state of a glass roll. It is a schematic side view which shows the manufacturing apparatus for embodying the manufacturing method of the glass roll which concerns on 2nd Embodiment of this invention.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a schematic side view showing a glass roll manufacturing apparatus for embodying a glass roll manufacturing method according to a first embodiment of the present invention. As shown in the figure, this manufacturing apparatus 1 performs an overflow downdraw method, and supplies molten glass Gm to the molded body 2 and causes the molten glass Gm to overflow from the molded body 2 and It is comprised so that the strip | belt-shaped glass film G may be manufactured, making it flow down.

  More specifically, the manufacturing apparatus 1 includes the following configurations in order from the top at the lower position of the molded body 2.

  That is, an edge roll 3 that sandwiches both widthwise ends of the glass film G flowed down from the molded body 2 from both the front and back sides is disposed immediately below the molded body 2. Tension is applied in the width direction to prevent contraction in the width direction.

  A slow cooling zone 4 is provided below the edge roll 3, and the glass film G is gradually cooled in the slow cooling zone 4, and strain is removed from the glass film G.

  A resin layer forming device 5 is disposed below the slow cooling zone 4. This resin layer forming apparatus 5 includes a resin film roll 8 in which a resin film 6 is wound around a core 7, and a sticking roller that draws the resin film 6 from the resin film roll 8 and sticks it to a glass film G. 9, and as shown in FIG. 2, the width direction center part (the thickness to be a product has a thickness that is not a product) Gb excluding both ends in the width direction of the glass film G on which the ear part is formed (an ineffective part that is not a product). The resin film 6 is stuck only on a certain effective portion Ga. In addition, it is preferable that the resin film 6 is adhere | attached so that peeling from the effective part Ga of the glass film G is possible afterwards.

  Although the resin film 6 should just be affixed on the surface of either side of the effective part Ga of the glass film G, in this embodiment, it is formed in the surface of the front and back both sides of the effective part Ga of the glass film G. It has become so. In addition, when sticking the resin film 6 only on the surface of either one of the front and back sides of the effective part Ga of the glass film G, the resin film 6 is placed on the surface on the side where transport means such as the transport belt 12 described later comes into contact. It is preferable to stick.

  The glass film G to which the resin film 6 is adhered by the resin layer forming device 5 is smoothly curved and sent in the lateral direction by the conversion roller 10, and then from below by the conveying belt 12 on which the cutting device 11 is arranged. Supported.

  The cutting device 11 is configured to cut the ineffective portion Gb of the glass film G supported by the conveyor belt 12. The cutting method of the ineffective portion Gb of the glass film G by the cutting device 11 may be a cleaving by bending stress (for example, a technique of engraving and breaking a scribe line), but in this embodiment, thermal stress Laser cleaving using is used. When laser cleaving is used in this way, there are advantages that online cutting is easy and the strength of the cut surface can be secured.

  As shown in FIG. 2, the cutting position P of the non-effective part Gb of the glass film G by the cutting device 11 is laterally outward from the width direction end face 6 a of the resin film 6 attached to the effective part Ga of the glass film G. The positions are slightly separated from each other. Therefore, after cutting the ineffective portion Gb of the glass film G, a part of the effective portion Ga of the glass film G protrudes from the end surface 6 a in the width direction of the resin film 6. The width direction dimension of the protruding portion of the effective portion Ga is, for example, 10 to 50 mm.

  And the ineffective part Gb of the glass film G cut | disconnected by the cutting device 11 is bend | folded below, cut | disconnected for every predetermined length, is dropped by its own weight, and is discarded. On the other hand, the effective part Ga of the glass film G is sent by the conveyor belt 12 in the same posture as before cutting, wound around the winding core 13 in a roll shape, and accommodated in the state of the glass roll 14. It has become.

  The manufacturing procedure of the glass roll by the glass roll manufacturing apparatus 1 comprised as mentioned above is demonstrated easily.

  First, as shown in FIG. 1, after a molding process for molding the glass film G from the molten glass Gm is performed by the molded body 2, an annealing process for removing strain from the glass film G is performed in the slow cooling zone 4.

  Next, the glass film G that has undergone the annealing step is subjected to a protection treatment step in which the resin film 6 is adhered by the resin layer forming apparatus 5. In this protection treatment step, as shown in FIG. 2, the resin film 6 is attached only to the effective portion Ga at the center in the width direction excluding the ineffective portion Gb at both ends in the width direction of the glass film G. If it does in this way, since effective part Ga used as a product can be certainly protected by resin film 6, it becomes possible to aim at improvement in handling nature of glass film G.

  Here, in this embodiment, the protection treatment process is executed after the annealing process, but the protection treatment process may be executed during the annealing process, that is, in the slow cooling zone 4. In addition, when performing a protection treatment process in the slow cooling zone 4, it is preferable to select what has heat resistance as the resin film 6 stuck to the effective part Ga of the glass film G. FIG.

  As shown in FIG. 1, the cutting process which cut | disconnects the non-effective part Gb of the width direction both ends by the cutting device 11 is performed to the glass film G which the resin film 6 was affixed on the effective part Ga at the protection process process. . At this time, since the resin film 6 is attached only to the effective portion Ga of the glass film G in the protection treatment step, the resin film 6 is not attached to the ineffective portion Gb, and the glass surface is exposed. It becomes a state. Therefore, in the cutting step, it is not necessary to cut the resin film 6 and the glass film G at the same time, and it is sufficient to cut only the glass film G. Therefore, the ineffective portion Gb of the glass film G can be easily and reliably cut while protecting the effective portion Ga of the glass film G with the resin film 6.

  And after passing through such a cutting process, the ineffective portion Gb of the glass film G is bent downward and cut into a predetermined length and discarded.

  On the other hand, the effective part Ga of the glass film G from which the ineffective part Gb has been cut and removed is sent to the winding process in the same posture as before cutting, and wound around the core 13 in a roll shape in the winding process. It is taken and accommodated in the state of the glass roll 14. At this time, if necessary, a buffer material that is wider than the effective portion Ga of the glass film G (for example, a sheet of paper or foamed resin), and the effective portion Ga of the glass film G to which the resin film 6 is adhered, The glass roll 14 may be manufactured by winding in a state where the two are stacked.

  In addition, when the effective part Ga of the glass film G has been wound up to a predetermined amount, the sticking of the resin film 6 by the resin layer forming device 5 is stopped, and the glass surface of the terminal part of the glass film G in the width direction. After being exposed, the exposed portion is cut in the width direction by a cutting device (not shown).

  As shown in FIG. 3, the glass roll 14 manufactured in this manner is attached in a protective treatment process between the effective portions Ga of the glass film G that is stacked several times around the core 13. In this state, the resin film 6 is interposed. Therefore, the resin film 6 functions as a spacer, and it is possible to prevent the effective portions Ga of the glass film G from directly contacting each other.

  Moreover, as shown in the enlarged view which attached | subjected the code | symbol X to the same figure, in the effective part Ga of the glass film G, the protrusion part Ga1 which protruded to the width direction outer side from the width direction end surface 6a of the resin film 6 is shown. Is formed. This protrusion part Ga1 is mutually spaced apart in the lamination direction via the side space S of the width direction end surface 6a of the resin film 6. Therefore, no matter how many times the effective portion Ga of the glass film G is wound up, the protruding portions Ga1 are not brought into contact with each other and pressed. Therefore, excessive stress does not act on the width direction end surface 6a of the protruding portion Ga1 constituted by the cut surface, and it becomes possible to reliably reduce the breakage of the effective portion Ga of the glass film G.

  FIG. 4: is a schematic side view which shows the manufacturing apparatus of the glass roll for embodying the manufacturing method of the glass roll which concerns on 2nd Embodiment of this invention. The manufacturing apparatus according to the second embodiment is different from the manufacturing apparatus according to the first embodiment in the resin layer forming method by the resin layer forming apparatus 5. That is, the resin layer forming apparatus 5 of the manufacturing apparatus 1 according to the second embodiment includes the sheet die 16 that supplies the ultraviolet curable resin 15 and the ultraviolet curable resin 15 supplied by the sheet die 16 as the effective portion Ga of the glass film G. An application roller 17 for applying only the ultraviolet light, and an ultraviolet irradiation device 18 for curing the ultraviolet curable resin 15 applied by the application roller 17 by ultraviolet irradiation. If it does in this way, the resin layer can be formed in the effective part Ga of the glass film G from resin which does not exhibit a film form previously.

  Here, the resin for forming the resin layer on the effective portion Ga of the glass film G is not limited to the ultraviolet curable resin 15 and may be, for example, other thermosetting resins or thermoplastic resins. Further, instead of stretching the resin with the application roller 17 to form the resin layer, the resin layer may be formed by spray coating the resin.

  In addition, in said 1st Embodiment and 2nd Embodiment, when cut | disconnecting the width direction both ends Gb in which the ear | edge part of the glass film G continuous to the molded object 2 was cut | disconnected, only the effective part Ga of the glass film G However, in order to adjust the width direction dimension of the glass film G accommodated in the state of the glass roll 14, both end portions in the width direction of the glass film G by a roll-to-roll method ( The present invention can be similarly applied to the case of cutting the ineffective portion Gb to be removed by cutting.

  The glass film G is preferably alkali-free glass. The thickness of the glass film G is preferably 5 to 300 μm, more preferably 10 to 200 μm, and most preferably 20 to 100 μm. This is because if the thickness of the glass film G is less than 5 μm, the moldability deteriorates, and if it exceeds 300 μm, the flexibility is lowered and it is difficult to wind it into a roll.

  The resin raw material of the resin film 6 is, for example, polyethylene, polyvinyl chloride, polyethylene terephthalate, polyvinylidene chloride, polypropylene, polyvinyl alcohol, polyester, polycarbonate, polystyrene, polyacrylonitrile, ethylene vinyl acetate copolymer, ethylene-vinyl alcohol copolymer. Polymers, ethylene-methacrylic acid copolymers, polyamides, cellophane, silicone resins and the like can be used. The thickness of the resin film 6 is preferably 3 to 250 μm, and more preferably 10 to 100 μm. This is because when the thickness of the resin film 6 is less than 3 μm, the protective effect of the glass film G is reduced, and when the thickness of the resin film 6 exceeds 250 μm, the flexibility of the resin film 6 deteriorates, and the glass film It is for inhibiting the flexibility of the glass film G, when it sticks to G.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Molded body 3 Edge roll 4 Slow cooling zone 5 Resin layer forming apparatus 6 Resin film 11 Cutting apparatus 14 Glass roll G Glass film Ga Effective part (width direction center part)
Ga1 protrusion part Gb non-effective part (width direction both ends)
Gm molten glass

Claims (8)

A glass film cutting method for cutting both ends in the width direction of the glass film,
In the state in which the resin layer is formed only in the central portion in the width direction excluding the both end portions in the width direction of at least one side of the front and back surfaces of the glass film, both end portions in the width direction of the glass film on which the resin layer is not formed are cut. A method for cutting a glass film. In the manufacturing method of the glass roll provided with the cutting process which cut | disconnects the width direction both ends of a glass film, and the winding process which winds the glass film which cut | disconnected this width direction both ends into a roll shape, and uses it as a glass roll,
Before the cutting step, a protective treatment step is provided to form a resin layer only in the widthwise central portion excluding both widthwise end portions of the front and back surfaces of the glass film. In the cutting step, the glass film A method for producing a glass roll, comprising cutting a width direction both ends of a glass film in which the resin layer is not formed in a state where the width direction central portion is protected by the resin layer.   The said resin layer is formed by sticking a resin film on a glass film, The manufacturing method of the glass roll of Claim 2 characterized by the above-mentioned.   The process including the protective treatment process, the cutting process, and the winding process is performed on the transport path while continuously transporting the long glass film. The manufacturing method of the glass roll of description.   The said resin layer is formed in the surface of the side which contacts the glass film conveyance means located on the conveyance path | route after the said protection process process among the front and back of a glass film, It is characterized by the above-mentioned. Glass roll manufacturing method.   In the cutting step, the both ends in the width direction of the glass film are cut at positions separated from both end faces in the width direction of the resin layer, and the cut glass film is eaten from both end faces in the width direction of the resin layer. In the winding step, when the glass film is rolled up in the winding step, the protruding portion of the glass film is formed in the lateral space on both end surfaces in the width direction of the resin layer. The glass roll manufacturing method according to any one of claims 2 to 5, wherein the glass roll is separated in the stacking direction.   The method for producing a glass roll according to any one of claims 2 to 6, wherein the glass film is formed by a float method or a downdraw method.   The thickness of the width direction center part of the glass film before the said cutting process is 5-300 micrometers, The manufacturing method of the glass roll of any one of Claims 2-7 characterized by the above-mentioned.

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