JP2007119322A - Glass roll and manufacturing method of glass substrate with functional film using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture continuously a glass substrate with a functional film of a predetermined size by using a glass roll obtained by winding a thin glass sheet around a core. <P>SOLUTION: Scribe lines (2) for cutting are formed on a continuous glass sheet (1), then the sheet is rolled around a core (6) to produce a glass roll (100). A functional film is formed on the surface of a glass sheet supplied from this glass roll in which the scribe line is not formed, then the glass sheet is cut along the scribe line, and thereby the glass substrate with the functional film of the predetermined size can be obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to, for example, a glass roll used as a substrate material for continuously forming a functional film on a surface and a method for producing a glass substrate with a functional film using the glass roll.

  A substrate having a functional film formed on the surface of a film is used for a display device or the like. As a method for producing a substrate with a functional film, for example, a method of winding a polymer film such as PET in a roll shape and forming a functional film using a roll-to-roll method is known. The roll-to-roll method is excellent in productivity. However, in this method, since a polymer film that does not necessarily have sufficient heat resistance is used as the substrate, there is a limit to the obtained substrate with a functional film (and thus the performance of a device using the same).

  On the other hand, glass has established a firm position as a substrate material for forming a high-performance functional film because of the high thermal stability of the material. When glass is used, a functional film is formed on a panel-shaped glass substrate, and the panel on which the functional film is formed is used as it is as one member, or the panel is divided into a plurality of functions. It has been performed to obtain a glass substrate with a conductive film. That is, the glass substrate with a functional film is generally produced by batch processing. Specifically, as shown in FIG. 13, after a large panel 25 is prepared and a functional film is formed thereon, a scribe line (cut groove) 26 is provided, and mechanical or thermal stress is applied to the scribe line. The glass substrate 27 having a predetermined size is manufactured by breaking (cutting) along the line.

  As a method of cutting the glass substrate, as disclosed in Japanese Patent No. 3478762 (Patent Document 1), a scribe line is formed on the glass substrate, laser light is emitted, and the mu is irradiated to perform ablation. The method of breaking the glass substrate along the scribe line by absorbing the energy of the laser beam to the mu by the effect and breaking the interatomic bond or intermolecular bond, or Japanese Patent No. 3577492 (Patent Document 2) As disclosed, a scribe line was formed by scratching the surface of the base material with a wheel cutter made of diamond or cemented carbide on a glass substrate, and a chemical treatment was performed to remove glass cracks that occurred during the formation of the scribe line. After that, the glass is cut and separated by applying mechanical or thermal stress to the scribe line. A.

  Unlike the case of using a PET film, when a glass substrate is used, a long sheet with a functional film is not produced by the roll-to-roll method. A glass sheet that is thinly formed like a film and wound into a roll is disclosed in JP 2002-544104 (Patent Document 3). Specifically, Patent Document 3 discloses a glass roll in which film glass (that is, glass having a thickness of less than 0.7 mm, preferably less than 0.4 mm) is formed in a roll shape. Patent Document 3 discloses that a glass ribbon 28 stretched into a film glass shape is wound around a core 29 as shown in FIG.

Japanese Patent No. 3478762 Japanese Patent No. 3577492 Special Table 2002-544104

  The methods described in Patent Documents 1 and 2 are methods for obtaining a glass substrate with a functional film having a required size by cutting a glass substrate batchwise using a large glass plate. Therefore, these methods still have room for improvement in terms of efficiently and inexpensively continuously producing devices with a functional film having a predetermined size. For example, in the method disclosed in Patent Document 1, after placing on a cutting device and forming a scribe line on a glass substrate, a laser beam is emitted to irradiate the mu, and the ablation effect is applied to the mu. Absorbing the energy of the laser beam and cutting the interatomic bond or intermolecular bond to break the glass substrate along the scribe line, there is an inconvenience that high-quality cutting cannot be performed without complicated processes. . The method disclosed in Patent Document 2 is not always easy in that it requires a chemical treatment to remove the cracks in the glass generated during the scribe line formation before cutting the glass. Furthermore, both of the methods disclosed in Patent Documents 1 and 2 are applied to a plate-like glass sheet, and are difficult to apply to a glass roll as disclosed in Patent Document 3. .

  If the present inventors can use the glass roll disclosed in Patent Document 3 for the production of a substrate with a functional film having a predetermined dimension, the functional film can be continuously formed, and a device such as a display. Thought that mass production would be easier. Furthermore, in order to use a glass roll, after forming a functional film | membrane on the glass sheet drawn | fed out from a glass roll, it thought that it cut | disconnected efficiently to a predetermined dimension. Therefore, this invention makes it a subject to provide the glass roll which can be cut | disconnected efficiently, and to provide the method of manufacturing a glass substrate with a functional film efficiently using this glass roll.

  In order to solve the above problems, the present invention provides a glass roll in which a glass sheet is wound around a core, and the glass sheet has a scribe line. The glass sheet constituting the roll is an integral long object in one roll, and such a glass sheet may be referred to as a “glass ribbon”. In addition, “glass sheet” is used herein to include a glass sheet that is being manufactured. Furthermore, the “scribe line” refers to a groove-like recess.

  The glass roll of the present invention is characterized in that a glass sheet wound in a roll shape has a scribe line. With this feature, for example, a functional film is formed on a glass sheet fed from a roll, and then the glass sheet is cut along a scribe line, thereby easily obtaining a glass substrate with a functional film having a predetermined dimension. It becomes possible.

  At least one of the scribe lines provided on the glass sheet is preferably provided so as to extend in parallel with the width direction of the glass sheet (that is, the direction perpendicular to the length direction of the glass sheet). That is, the scribe line is preferably provided on the glass sheet so that the cutting line of the glass sheet is parallel to the width direction of the sheet. If a scribe line is provided so as to extend in parallel with the width direction of the glass sheet and a glass roll having a predetermined width is used, it is possible to cut vertically and horizontally only by cutting once along the scribe line. A glass sheet having a predetermined dimension can be easily obtained.

  In the glass roll of the present invention, the scribe line may be provided in a broken line shape on one imaginary line parallel to the width direction of the glass sheet. In that case, it is preferable that the broken-line-shaped scribe lines are located at both ends in the width direction of the glass sheet and occupy 50% or more of the entire width of the glass sheet. When the scribe line is formed in a broken line shape, for example, the breaking strength when tensile stress is applied to the glass sheet can be increased, so that the glass sheet is prevented from being broken in the process of being wound around the winding core or in the wound state. it can. In addition, when the scribe line is formed in a broken line shape, the amount of dust generated when the scribe line is formed using a grinder is reduced, and as a result, the possibility that the final product is contaminated with dust becomes lower.

  In the glass roll of the present invention, the scribe line extending in the direction parallel to the width direction of the glass sheet is formed so that the depth thereof is deeper at the center than at both ends in the width direction of the glass sheet. preferable. Since both ends of the scribe line (that is, the side edges of the glass sheet) are more susceptible to external force during the manufacturing process, the depth of the scribe line located at both ends is reduced. It is possible to further prevent abnormal cracks from occurring inside the scribe line.

  In the glass roll of the present invention, the depth of the scribe line located on the side far from the core and extending in parallel with the width direction of the glass sheet is located on the side near the core and extends in parallel with the width direction of the glass sheet. It is preferably formed so as to be deeper than the depth of the scribe line. Since the force applied to the glass sheet during winding differs between the side near the core and the side far from the core, changing the depth of the scribe line in this way in one roll makes the scribe line closer to the core. Further, it is possible to prevent breakage along the surface and obtain a stable glass roll.

  The shape of the scribe line is preferably a V-shaped groove. When the scribe line is a V-shaped groove, it becomes easier to cut the glass sheet.

  The scribe line is preferably provided only on one side of the glass sheet. In that case, the glass sheet is preferably wound around the core so that the surface on which the scribe line is formed is on the inside. When the glass sheet is wound around the core so that the surface on which the scribe line is formed is on the outside, tensile stress is applied in the direction perpendicular to the scribe line within the surface on which the scribe line is formed, and the glass sheet is wound. This is because there is a high possibility that the glass sheet breaks in the step of winding around the core or in the wound state. In addition, by providing a scribe line only on one side of the glass sheet and winding the glass sheet in a roll shape so that the one side is inside, a functional film, for example, is formed on the side where the scribe line is not formed. It can be formed well.

  In the glass roll of the present invention, the thickness of the glass sheet may be 0.05 to 0.20 mm. The sheet having such a thickness is suitable for forming a scribe line and winding it into a roll.

  The present invention also provides a glass roll in which a functional film is formed on the surface of the glass sheet where no scribe line is provided. “Functional film” refers to a film having a predetermined function according to the characteristics of the material constituting the film, such as a transparent conductive film, a conductive thin film, and an electromagnetic wave shielding film.

  The present invention also provides a method for producing a glass substrate with a functional film using the glass roll of the present invention. Specifically, the production method of the present invention supplies a glass sheet from a glass roll in which a glass sheet having a scribe line is wound around a core, and continuously forms a functional film on the surface, Cutting the glass sheet along a scribe line. According to this method, it is possible to efficiently manufacture a glass substrate with a functional film using the conventional continuous vapor deposition apparatus or continuous coating apparatus, for example.

  In the manufacturing method of the present invention, the scribe line has a scribe line extending parallel to the width direction of the glass sheet, and the depth of the scribe line located on the side far from the core is the depth of the scribe line located on the side close to the core. When a deeper glass roll is used, it is preferable to cut the glass sheet along the scribe line without forming the functional film and winding the sheet around the core. When there is a difference in the scrub line depth between the side closer to the core and the side farther, if the rolled glass roll is wound around the roll again, a deep scribe line will be located on the side closer to the core. Thus, the glass sheet may be damaged.

  In the production method of the present invention, the glass sheet may be subjected to a heat treatment when the functional film is formed. When the functional film is formed while the glass sheet is heated by heat treatment, a functional film having good characteristics can be obtained depending on the type of the functional film.

  The glass roll of the present invention is characterized in that a scribe line is formed on a long glass sheet. With this feature, the glass roll of the present invention can continuously and efficiently produce a glass substrate on which a functional film is formed by a roll-to-roll method. In addition, by forming scribe lines extending in parallel with the width direction of the glass sheet at an appropriate interval, it is possible to obtain a glass substrate with a functional film having a predetermined size only by repeatedly performing cutting in one direction. Therefore, for example, the cutting process can be easily and inexpensively performed as compared with the case of cutting a plurality of sheets from a large panel.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 schematically shows a glass roll 100 obtained by winding a long glass sheet 1 having a scribe line around a winding core 6. Further, FIG. 1 includes an enlarged view of a part of the glass sheet 1. In the enlarged view, a scribe line 2 provided across the entire width of the glass sheet so as to extend in a direction parallel to the width direction of the glass sheet 1 is shown. The scribe lines 2 are provided at intervals in the longitudinal direction of the glass sheet 1, and the intervals are appropriately selected according to the dimensions of a desired device so as to obtain a substrate (or cell) having a predetermined basic length 5. The The scribe line 2 is a V-shaped groove, is provided on one surface of the glass sheet 1, and is wound around the core such that the surface is on the inside. The other surface of the glass sheet on which no scribe line is provided is used as the functional film forming surface 4.

The glass sheet 1 is, for example, high strain point glass, more specifically, soda lime glass mainly composed of SiO ₂ · Al ₂ O ₃ , having a strain point of 520 ° C. and an expansion coefficient of 86 [ 10 ⁻⁶ / K]. The thickness of the glass sheet 1 is 0.05 to 0.20 mm when the outer diameter of the core 6 is 300 mm, which is equivalent to the outer diameter of a core that is normally used when a polymer film such as PET is wound. It is preferable to do. If the glass sheet is thicker than 0.20 mm, glass breakage tends to occur when it is wound around the core, and if it is thinner than 0.05 mm, the winding can be performed stably, but the glass sheet is handled in a later step. Sometimes glass breaks easily.

  The width | variety of the glass sheet 1 is suitably selected with the basic length 5 according to the magnitude | size etc. of the device (for example, a display, a touchscreen, etc.) to obtain. The width of the glass sheet may be about 100 to 300 mm, for example, and the basic length 5 may be about 50 to 1000 mm, for example.

  The depth of the scribe line 2 (in the case of a V-shaped groove, the depth of the V-shaped tip) is preferably 10% to 20% of the thickness of the glass sheet 1. When the depth of the scribe line 2 is less than 10% of the thickness of the glass sheet 1, the glass is difficult to break along the scribe line at the time of cutting (break), so that the break cannot be made cleanly. If the depth of the scribe line exceeds 20% of the thickness of the glass sheet, cracking may occur from the scribe line as the starting point when winding on the core.

  Next, an example of a method for producing the glass roll shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a schematic view showing a method for manufacturing the glass roll 100. FIG. 2 also shows an enlarged view in which a part of the glass sheet 1 on which the scribe line 2 is formed is enlarged. As shown in FIG. 2, the glass roll 100 produces a long glass sheet (or glass ribbon) 1 from the melting furnace 7, forms scribe lines 2 at intervals corresponding to the basic length 5, It is produced by winding it around the core 6. The scribe line 2 is formed by passing between the transfer roller 8 and the auxiliary roller 9 when the glass sheet is at a temperature equal to or higher than the softening point of the glass before the glass sheet 1 is cooled. The transfer roller 8 has a wedge-shaped protruding portion (not shown) so that a V-shaped groove can be formed. The transfer roller 8 is in contact with only one surface of the glass sheet 1 and forms the scribe line 2 only on one surface of the glass sheet. The scribe line 2 is formed by the transfer roller 8 at regular intervals so that an interval corresponding to the basic length 5 is provided according to the traveling speed of the glass sheet 1. As a specific example, the transfer roller 8 contacts the glass sheet 1 to form the scribe line 2 at regular intervals, and the transfer roller 8 moves so as not to contact the glass sheet 1 at other times. Let After the scribe line 2 is formed by the transfer roller 8, the glass sheet 1 is cooled and wound around the core 6. The positions of the transfer roller 8 and the auxiliary roller 9 may be appropriately controlled in order to form a scribe line extending in parallel with the width direction of the continuously running glass sheet 1.

  By changing the shape of the protruding portion of the transfer roller 8, the scribe line 2 can be formed over the entire width of the glass sheet 1 as shown in FIG. 3, or the width of the glass sheet 1 as shown in FIG. A broken scribe line 2 can be formed in the parallel direction. FIG. 4 shows a scribing system in which three short scribe lines 2a-c are formed in a direction parallel to the width of the glass sheet 1 and can be cut along an imaginary line (indicated by a dotted line in the figure) through which these lines pass as a whole. Line 2 is formed. here. The term “short” is used to mean shorter than a scribe line formed over the entire width.

  When forming the scribe line 2 of the broken line shape which consists of several short scribe lines 2a-c as shown in FIG. 4, it is preferable to locate a short scribe line in the both-sides edge part of the glass sheet 1. FIG. If the scribe lines are not positioned on both side edges of the glass sheet, there will be no guide for cutting, and abnormal cracking is likely to occur at the edges on both sides. Furthermore, when forming the scribe line 2 of a broken line shape, it is preferable that the combined length of the short scribe lines 2 a-c constituting the scribe line 2 is 50% or more of the entire width of the glass sheet 1. When the combined length of the short scribe lines 2a-c is less than 50% of the entire width of the glass sheet 1, the distance between the short scribe lines becomes long, and abnormal cracks are likely to occur in the portion.

  Here, the abnormal crack generation | occurrence | production situation during glass roll manufacture when various broken line-shaped scribe lines are formed in the glass sheet 1 of width 150mm and thickness 0.1mm is shown. Table 1 shows the occurrence of abnormal cracks when the broken line-shaped scribe lines are formed such that the lengths of the short scribe lines are different from each other in the total width of the glass sheet 1. The depth of each scribe line was 0.015 mm, and the basic length was 200 mm.

  As is clear from Table 1, abnormal cracks occurred during the production of the glass roll when the proportion of the broken-line scribe lines was less than 50% of the width of the glass sheet 1. It confirmed that it cut | disconnected favorably similarly to the case where the scribe line was provided over the full width of the glass sheet 1 that the ratio for which the broken line scribe line occupied was 50% or more of the width | variety of the glass sheet 1. FIG. Therefore, in order not to reduce the strength of the glass sheet 1 in the scribe line portion, it is preferable to form the broken-line scribe line so as to be 50% or more of the width of the glass sheet 1. In addition, as will be described later, when a scribe line is formed using a wheel cutter, it is preferable to form a broken line scribe line in order to reduce glass powder generated by cutting.

  When forming a scribe line having a broken line shape as shown in FIG. 4, the depth of the short scribe lines 2a and 2c located on both sides of the glass sheet 1 is greater than the depth of the short scribe line 2b located in the center. It is also preferable to make it shallower. FIG. 5 shows a cross-sectional view of the glass sheet provided with such a scribe line, cut along the width. Both side edges of the glass sheet 1 are more susceptible to external forces when they are wound around the core and when a functional film is formed by the roll-to-roll method, resulting in abnormal cracking. Cheap. Therefore, it is preferable to make the depth 11 of the scribe lines 2a and 2c located here smaller than the depth 12 of the scribe line 2b to further prevent the occurrence of abnormal cracking. In addition, even when such a depth difference is provided in one scribe line, it was confirmed that the glass sheet can be accurately cut along the scribe line when cutting by applying mechanical stress or thermal stress. . For example, the depth 11 of the short scribe lines 2a and 2c is 10 to 15% of the thickness 10 of the glass sheet 1, and the depth 12 of the scribe line 2b is 15 to 20% of the thickness 10 of the glass sheet 1. Is preferred.

  The scribe line 2 shown in FIG. 4 is composed of three short scribe lines. This is an example, and the broken scribe line may be composed of four or more short scribe lines, or may be composed of two short scribe lines.

  In another embodiment, the scribe line extending in parallel with the width direction of the glass sheet has a depth 21 of the scribe line 20 located on the side closer to the core as shown in FIG. Preferably, the scribe line 22 is formed to be shallower than the depth 23. In the vicinity of the center of the roll, that is, on the core side, the tensile force applied when winding the roll tends to be larger than that near the outer periphery of the roll, that is, on the outer side of the roll. A pressure is applied to the sheet by the sheet wound around the outside to form a laminate. Therefore, on the side near the roll core, a so-called “roll tightening” phenomenon occurs, and a greater stress is generated in the scribe line, and the sheet is easily damaged from the scribe line. Therefore, it is preferable to make the depth of the scribe line shallower on the side closer to the core to prevent the glass sheet from being damaged due to the “winding tight” phenomenon.

  As described above, the depth of the scribe line is preferably 10% to 20% of the thickness of the glass sheet 1, and in the case of providing a difference in the depth of the scribe line between the side close to the core and the side far from the core. Is preferably within this range. The depth of the scribe line may be continuously deepened from one side closer to the core to the far side in one roll, or may be deepened stepwise.

  6 and 7 schematically show an example of a method for forming a broken-line scribe line as shown in FIG. FIG. 6 shows that a long glass sheet 1 is produced from a melting furnace 7 and cooled (the cooling device is not shown), and then a scribe line is provided on one surface of the glass sheet 1 with a wheel cutter 13 (or 14). The outline of the method of forming by is schematically shown. FIG. 7A and FIG. 7B are schematic views respectively showing examples of arrangement of a plurality of wheel cutters for forming a plurality of short scribe lines.

  As the wheel cutter, for example, a conventionally used wheel cutter for glass processing made of diamond or a superalloy can be used. When the outer diameters of the wheel cutters are small and do not interfere with each other, the wheel cutters 13a-c are arranged in a line as shown in FIG. The cutters 13a-c are operated to form short scribe lines 2a-c arranged in a straight line.

  When the outer diameters of the wheel cutters are large and interfere with each other, the groove wheel cutters 14a-c are arranged with a certain interval in the traveling direction of the glass sheet 1, as shown in FIG. Thus, when arrange | positioning the wheel cutter 14a-c, the short scribe line 2a-c arranged in a straight line can be formed by making these operation | movement time simultaneous or shifting according to the travel speed of the glass sheet 1. it can. For example, when the interval between the wheel cutters 14a-c is the same as the basic length 5, the wheel cutters 14a-c may be operated simultaneously. In FIG.7 (b), the wheel cutter which forms each scribe line 2a is mutually shifted and arrange | positioned in the advancing direction of a glass sheet. As long as the wheel cutters do not interfere with each other, two or more wheel cutters (for example, the wheel cutters forming the grooves 2a and 2c in FIG. 7B) may be arranged on a straight line parallel to the width of the glass sheet 1. . As another forming method, it is also possible to form a scribe line in a broken line by the same method as that using the transfer roller 8 shown in FIG.

  The scribe line may be formed using another device or method not shown. For example, the scribe line may be formed using a diamond scriber (glass cutting), or may be formed by ultrasonic processing or the like. In addition, the scribe line may be formed using a wheel cutter or the like after a glass sheet produced from a melting furnace is once wound around a core and then the sheet is drawn out from a roll. The scribing line extending in parallel with the longitudinal direction of the glass sheet has a transfer roller or wheel cutter or the like arranged one or more in parallel with the longitudinal direction of the glass sheet, and continuously at a predetermined position while the glass sheet is running. It is possible to form by operating. After forming the scribe line, the surface on which the scribe line is formed may be cleaned as necessary.

  2 and 6, the glass sheet 1 provided with the scribe line 2 is wound around the winding core 6 so that the surface provided with the scribe line 2 is on the inside to obtain a glass roll 100. When the scribe line 2 is directed outward, for example, when it is wound around the core 6 having an outer diameter of about 300 mm, tensile stress is concentrated on the scribe line, and there is a disadvantage that the glass sheet is broken starting from the scribe line.

  Next, a method for producing a glass sheet with a functional film using a glass roll obtained by winding a glass sheet provided with a scribe line will be described with reference to FIG. FIG. 8 shows that the glass roll 100 shown in FIG. 1 is unrolled and supplied, and a functional film is formed on the surface of the glass sheet 1 by a roll-to-roll method. A method for producing a sheet roll 200 is schematically shown. In FIG. 8, the same reference numerals as those shown in FIG. 1 are the same as the members or elements described in FIG.

The functional film is appropriately selected according to the final use of the sheet with the functional film, and may be a transparent conductive film having a thickness of about 100 nm made of, for example, ITO, ZnO, SnO ₂ or the like. The transparent conductive film is formed by, for example, a vapor deposition method, a sputtering method, a CVD method, or the like. The film forming conditions for the transparent conductive film may be the same as the film forming conditions employed in the method for obtaining a substrate with a functional film by cutting the glass substrate in a batch manner described in the section of the prior art. When the glass roll of the present invention is used, film formation can be carried out continuously, and film formation on one roll can be completely automated. Therefore, if the glass roll of the present invention is used, the process of replacing the substrate and the process of evacuating each time the substrate is replaced, which is necessary in the conventional batch-type film forming process, becomes unnecessary, and a functional film is provided. Substrate productivity is improved.

  As shown in the drawing, the functional film 16 is preferably formed on a surface where the scribe line 2 is not provided. A transparent conductive film such as ITO or ZnO formed by a vapor deposition method, a sputtering method, a CVD method or the like on the surface where the scribe line 2 is not provided is higher than the transparent conductive film formed on the surface where the scribe line 2 is provided. This is because the adhesive strength tends to adhere. This is because the surface on which the scribe line 2 is provided is likely to leave dirt such as glass cutting waste in the scribe line 2 due to insufficient cleaning, and compressive stress or the like occurs in the formed functional film. This is because the functional film is easily peeled from the vicinity of the scribe line 2.

  After forming the roll 200 of the sheet with the functional film, the sheet with the functional film is fed out from this roll, and mechanical or thermal stress is applied to the scribe line 2 to perform cutting (break). Thereby, the glass substrate 17 for touch panels which has a surface of 150 mm x 200 mm as shown in FIG. 9, for example can be obtained.

  With reference to FIG. 10, the specific method of manufacturing the glass substrate with a functional film for touch panels is demonstrated. First, the glass sheet 1 supplied from the substrate roll 6 is heated by the can 18, an ITO film is formed on the surface of the heated sheet 1 by a sputtering method, and the roll is wound by the core 15 to obtain the roll 200. Sputtering is performed using the target 19. When forming the ITO film, if the temperature of the can 18 is less than 300 ° C., the required resistance value cannot be obtained. That is, if the temperature when forming the film is too low, the crystallinity deteriorates and the resistance value of the film does not decrease. Therefore, the temperature of the can is preferably set to 300 ° C. or higher, and preferably about 350 ° C. .

  The radius of the can 18 is preferably 1000 times or more the thickness of the glass sheet 1. Therefore, for example, when the glass sheet has a thickness of 0.1 mm, the radius of the can 18 is preferably set to 100 mm or more. If the radius of the can 18 is less than 1000 times the thickness of the glass sheet 1, the glass sheet 1 is bent by the can 18 with a small radius of curvature, and cracks may occur.

  The speed of the glass sheet 1 at the time of sputtering is appropriately selected according to the thickness of the functional film to be formed, the power at the time of sputtering, and the like. For example, when an ITO film having a thickness of 100 nm is formed, the speed of the glass sheet 1 can be set to 50 m / sec.

  Thereafter, the sheet is fed out from the roll 200 of the functional film-coated sheet, mechanical or thermal stress is applied to the scribe line, the sheet is cut along the scribe line, and the functional film-coated glass having a predetermined size is obtained. Get the substrate. The obtained substrate is assembled into a touch panel by a conventional method. Specifically, the sheet is subjected to an etching process to give a pattern to the functional film. Next, an electrode is formed on the surface of the functional film by printing and baking. A touch panel is obtained by bonding the substrate with the functional film on which the electrodes are formed with a certain gap so that the electrodes face each other.

The roll of the glass sheet provided with the scribe line can be applied to a substrate with a functional film for constituting various display devices such as a liquid crystal display, an EL display, and a PDP in addition to the substrate with a functional film for a touch panel.
In any case, by selecting the basic length 5 and the width of the glass sheet 1 shown in FIG. 1, a substrate with a functional film having a predetermined dimension can be manufactured. If necessary, in addition to or instead of the scribe line extending in the direction parallel to the width direction of the glass sheet, a scribe line extending in the direction parallel to the length direction of the glass sheet is provided, and the functionality of a predetermined dimension is provided. A substrate with a film may be obtained.

  FIG. 12 is a diagram showing a specific example using a glass roll described with reference to FIG. 11 in which the depth of the scribe line located on the side closer to the core is shallower than the depth of the scribe line located on the side far from the core. The method of manufacturing the board | substrate with a functional film of a dimension is shown typically. The glass sheet 1 is supplied from the glass roll 100 wound around the core 6, and an ITO film, which is a functional film, is formed on the glass sheet 1 by a sputtering method while heating the glass sheet 1 with a can 18 set at 350 ° C. . Sputtering is performed using the target 19. Next, the glass sheet 17 with the functional film is obtained by drawing the glass sheet with the pulling rollers 24a and 24b sandwiching the sheet on which the functional film is formed, and then cutting (breaking). As an example of the method of cutting (breaking), sputtering and cutting (breaking) are performed in the same vacuum chamber, and the glass substrate with a functional film completed by cutting is stocked in a stocker, and then adjacent to the vacuum chamber. A method of taking out from the provided vacuum chamber for unloading (unload chamber) can be used. According to this manufacturing method, the formation from the functional film to the break can be continuously performed, and the glass substrate with the functional film can be obtained more efficiently. In addition, when using a glass roll in which the depth of the scribe line located on the side far from the core is deeper than the depth of the scribe line located on the side close to the core, the glass sheet is again formed after the functional film is formed. When wound on a roll, the deep scribe line is located on the side closer to the core. As a result, breakage tends to occur. Therefore, when such a glass roll is used, it is preferable to employ a manufacturing method as shown in FIG. The manufacturing method shown in FIG. 12 is not applied only to the glass roll shown in FIG. 11, but may be applied to other glass rolls (for example, the glass roll shown in FIGS. 1 and 4).

  In the above, the glass roll which wound the glass sheet which provided the scribe line around the winding core was demonstrated. The present invention can also be applied to other brittle materials. Here, the brittle material means a material that hardly undergoes plastic deformation until fracture. Examples of brittle materials other than glass include cast iron and ceramic materials. The brittle material is suitable for forming a scribe line and cutting. By applying the present invention, a roll made of a brittle material other than glass can be obtained.

  The long glass sheet on which the scribe line of the present invention is formed is used to form a functional film on the surface thereof and to produce a glass substrate with a functional film of a predetermined dimension. It is suitable for use as a glass substrate for use in various display devices such as touch panels, liquid crystal displays, EL displays, and PDPs.

Schematic diagram of an example of the glass roll of the present invention The schematic diagram which shows the method of forming a scribe line in the glass sheet which comprises the glass roll of this invention. The top view of an example of the glass sheet which comprises the glass roll of this invention The top view of another example of the glass sheet which comprises the glass roll of this invention Sectional drawing which shows the depth of an example of the scribe line formed in the glass sheet which comprises the glass roll of this invention The schematic diagram which shows the method of forming a scribe line in the glass sheet which comprises the glass roll of this invention. (A) And (b) is a schematic diagram which shows the method of forming a scribe line in the glass sheet which comprises the glass roll of this invention. The schematic diagram which shows an example of the method of forming a functional film in the glass sheet which comprises the glass roll of this invention The perspective view which shows an example of the glass substrate with a functional film produced using the glass roll of this invention The schematic diagram which shows another example of the method of forming a functional film in the glass sheet which comprises the glass roll of this invention. The schematic diagram which shows the depth of another example of the scribe line formed in the glass sheet which comprises the glass roll of this invention The schematic diagram which shows an example of the method of manufacturing the glass substrate with a functional film using the glass roll of this invention. Schematic diagram showing a conventional glass substrate manufacturing method Schematic diagram showing a conventional glass roll manufacturing method

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass sheet 2 Scribe line 2a, 2b, 2c Scribe line 4 Functional film formation surface 5 Basic length 6 Core 7 Melting furnace 8 Transfer roller 9 Auxiliary roller 10 Glass sheet thickness 11 Scribe line depth 12 Scribe line Depth 13 of wheel cutter 13a, 13b, 13c Wheel cutter 14a, 14b, 14c Wheel cutter 15 Core 16 Functional film 17 Glass substrate with functional film 18 Can 19 Target 20 Scribe line 21 Scribe line depth 22 Scribe line 23 Depth of scribe line 24a Pull roller 24b Pull roller 25 Large panel 26 Scribe line 27 Glass substrate 28 Glass sheet 29 Core 100, 200 Glass roll

Claims (12)

  A glass roll in which a glass sheet is wound around a core, and the glass sheet has a scribe line.   The glass roll according to claim 1, wherein at least one of the scribe lines is provided so as to extend in parallel with the width direction of the glass sheet.   The scribe line is provided in a broken line on one imaginary line parallel to the width direction of the glass sheet, the scribe line is located at both ends of the glass sheet, and the total length of the scribe line is 50% of the width of the glass sheet. The glass roll according to claim 2 which is the above.   The glass roll according to claim 2 or 3, wherein the depth of the scribe line extending in parallel with the width direction of the glass sheet is deeper at the center than at both ends in the width direction of the glass sheet.   The depth of the scribe line located on the side far from the core and extending in parallel with the width direction of the glass sheet is deeper than the depth of the scribe line located on the side near the core and extending in parallel with the width direction of the glass sheet. The glass roll according to claim 2.   The glass roll according to any one of claims 1 to 5, wherein the scribe line is a V-shaped groove.   The glass roll according to any one of claims 1 to 6, wherein the scribe line is provided only on one surface of the glass sheet, and the glass sheet is wound around the core with the surface on which the scribe line is provided as an inner side. .   The glass roll of any one of Claims 1-7 whose thickness of a glass sheet is 0.05-0.20 mm.   The glass roll of Claim 7 in which the functional film is formed in the surface in which the scribe line of a glass sheet is not provided.   A glass sheet is supplied from the glass roll according to any one of claims 1 to 8, and a functional film is continuously formed on the surface of the glass sheet, and along the scribe line after the functional film is formed. A method for producing a glass substrate with a functional film, comprising cutting a glass sheet.   A glass sheet is supplied from the glass roll according to claim 5, and a functional film is continuously formed on the surface of the glass sheet, and a scribe line is formed without winding the glass sheet on which the functional film has been formed around a winding core. The manufacturing method of the glass substrate with a functional film including cutting | disconnecting a glass sheet along. The method for producing a glass substrate with a functional film according to claim 10 or 11, wherein the functional film is formed while subjecting the glass sheet to a heat treatment at 300 ° C or higher.

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