Method for producing glass plate with scribe line, method for producing glass article, platen device, and glass article

Abstract

[Solution] This method for producing a glass plate with a scribe line comprises a delivery step and a scribe line formation step. The delivery step is for delivering, onto a platen device (11), a glass plate (G1) that has a thickness of not more than 0.2 mm. The scribe line formation step is for using a tool (T) to form a scribe line in the glass plate (G1) on the platen device (11). The platen device (11) has a support layer (13) that supports the glass plate (G1). The support layer (13) of the platen device (11) is constituted by a polymer material.

Description

Method for manufacturing glass plate with scribe lines, method for manufacturing glass article, surface plate device, and glass article

[0001] The present invention relates to a method for manufacturing a glass plate with scribe lines, a method for manufacturing a glass article, a surface plate device, and a glass article.

[0002] As described in Patent Document 1, a method is known for cutting a glass plate, in which a scribe line is formed on the glass plate using a tool, and then the glass plate is divided along the scribe line.

[0003] Japanese Patent Application Laid-Open No. 2023-051329

[0004] When dividing a glass plate along a scribe line formed in the glass plate as described above, it becomes more difficult to stably divide the glass plate as the thickness of the glass plate decreases. The present invention was made by finding a method that can easily form a scribe line for stably dividing the glass plate.

[0005] An object of the present invention is to provide a method for manufacturing a glass plate with a scribe line, a method for manufacturing a glass article, and a surface plate device that enable stable division using the scribe line to be easily achieved. Another object of the present invention is to provide a glass article having an end face with stable quality.

[0006] A method for manufacturing a glass plate with a scribe line, a method for manufacturing a glass article, a scribe line forming surface plate device, and a glass article that solve the above problems will be described below. A method for manufacturing a glass plate with a scribe line in Aspect 1 includes a carrying step of carrying a glass plate having a thickness of 0.2 mm or less onto a surface plate device, and a scribe line forming step of forming a scribe line on the glass plate on the surface plate device using a tool. The surface plate device has a support layer that supports the glass plate, and the support layer is made of a polymer material.

[0007] According to this method, by forming the support layer of the platen device used in the scribe line forming step from a polymer material, the support layer absorbs the impact when the scribe line is formed on the glass plate. In this scribe line forming step, it is possible to easily suppress changes in the shape of the cracks formed along the scribe line over the entire length of the scribe line.

[0008] In the method for producing a glass plate with a scribe line of Aspect 2, the polymer material of the support layer may include at least one of rubber, elastomer, and synthetic resin in Aspect 1. In the method for producing a glass plate with a scribe line of Aspect 3, the thickness of the support layer may be in the range of 0.03 mm or more and 4 mm or less.

[0009] In the method for producing a glass plate with scribe lines of Aspect 4, in Aspect 2 or Aspect 3, the polymer material of the support layer may have a tensile modulus of elasticity in the range of 1 MPa or more and 200 MPa or less.

[0010] In the method for manufacturing a glass plate with a scribe line of Aspect 5, in any one of Aspects 1 to 4, the platen device may have a suction channel that sucks the glass plate placed on the platen device, and in the scribe line forming step, the glass plate placed on the platen device may be fixed to the platen device by sucking using the suction channel, and then the scribe line may be formed on the glass plate. This method makes it possible to further improve the positional accuracy of the scribe line, for example.

[0011] In the method for manufacturing a glass plate with a scribe line of Aspect 6, in any one of Aspects 1 to 5, the scribe line forming step may include placing a protective sheet between the support layer and the glass plate to protect the support layer, and then forming the scribe line on the glass plate on the protective sheet. According to this method, the support layer of the surface plate device is protected by the protective sheet, which can, for example, prevent scratches on the support layer and adhesion of foreign matter to the support layer.

[0012] Aspect 7 is the method for producing a glass plate with scribe lines according to aspect 6, wherein the protective sheet has a thickness of 10 g / m２ Above, 200g / m ２ The sheet may include at least one of a paper sheet having a basis weight within the following range and a synthetic resin sheet having a thickness within the range of 0.02 mm or more and 1 mm or less.

[0013] In the method for producing a glass plate with a scribe line of Aspect 8, the content of virgin pulp in the paper sheet may be in the range of 50% by mass or more and 100% by mass or less, and the content of recycled pulp in the paper sheet may be in the range of 0% by mass or more and 50% by mass or less, in Aspect 7. According to this method, the higher the content of virgin pulp in the paper sheet, the more improved the surface smoothness of the paper sheet, making it possible to suppress the occurrence of defective cracks other than median cracks along the scribe line.

[0014] In the method for manufacturing a glass plate with a scribe line of Aspect 9, in any one of Aspects 6 to 8, the arithmetic mean height Sa of the support surface of the protective sheet on which the glass plate is placed may be 5 μm or less. According to this method, the surface smoothness of the protective sheet is improved, making it possible to suppress the occurrence of defective cracks other than median cracks along the scribe line.

[0015] In the method for producing a glass plate with a scribe line of Aspect 10, in any one of Aspects 6 to 9, the Young's modulus of the protective sheet may be 1 GPa or more. This method makes it possible to suppress the occurrence of defective cracks other than median cracks along the scribe line.

[0016] In the method for manufacturing a glass plate with scribe lines of Aspect 11, in any one of Aspects 6 to 10, the carrying-in step may include placing the protective sheet on the support layer of the surface plate device in a state where the glass plate is placed on the protective sheet. According to this method, the glass plate can be easily carried in by utilizing the protective sheet.

[0017] The method for manufacturing a glass plate with scribe lines of Aspect 12, in any one of Aspects 6 to 11, may further include a carrying-out step of carrying out the glass plate with scribe lines and the protective sheet from the surface plate device while the glass plate with scribe lines is placed on the protective sheet. According to this method, the glass plate with scribe lines can be easily carried out from the surface plate device by utilizing the protective sheet.

[0018] The method for manufacturing a glass article of aspect 13 includes a loading step of loading a glass plate having a thickness of 0.2 mm or less onto a platen device, a scribe line forming step of forming a scribe line on the glass plate on the platen device using a tool, and a dividing step of dividing the scribe-lined glass plate along the scribe line to obtain the glass article, wherein the platen device has a support layer that supports the glass plate, and the support layer is made of a polymer material.

[0019] Aspect 14 is a method for manufacturing a glass article according to Aspect 13, wherein the scribe line forming step comprises placing a protective sheet between the support layer and the glass plate to protect the support layer, and then forming the scribe line in the glass plate on the protective sheet, and the manufacturing method further comprises a carry-out step of carrying out the glass plate with the scribe line and the protective sheet from the surface plate device while the glass plate with the scribe line is placed on the protective sheet, and the dividing step may involve dividing the glass plate with the scribe line while it is placed on the protective sheet. This method allows the dividing step to be carried out smoothly after the carry-out step.

[0020] A surface plate apparatus of aspect 15 is a surface plate apparatus used for placing a glass plate having a thickness of 0.2 mm or less in a process of forming a scribe line in the glass plate using a tool, the surface plate apparatus having a support layer that supports the glass plate, the support layer being made of a polymer material.

[0021] The glass article of aspect 16 is a plate-shaped glass article having a thickness of 0.2 mm or less, wherein the end surface of the glass article has a trace of a scribe line and a trace of a median crack, and the maximum depth dimension MD of the trace of the median crack ｍａｘ and minimum depth dimension MD ｍｉｎ The difference ΔMD (ΔMD = MD ｍａｘ -MD ｍｉｎ ) is 8 μm or less.

[0022] In the glass article of aspect 17, in aspect 16, the average depth of the trace of the median crack is MD ＡＶＲ When the thickness of the glass article is t, MD ＡＶＲ / t may be 0.45 or less.

[0023] In the glass article of aspect 18, in aspect 16 or aspect 17, the average depth of the trace of the median crack is MD ＡＶＲ may be 20 μm or less.

[0024] One aspect of the present invention exhibits an effect of easily achieving stable division using a scribe line.

[0025] FIG. 1 is an exploded perspective view showing a surface plate device in an embodiment. FIG. 2 is a perspective view showing the surface plate device. FIG. 3 is a perspective view showing a glass plate and a protective sheet. FIG. 4 is a perspective view showing a state in which a glass plate is placed on the protective sheet. FIG. 5 is a perspective view showing a state in which the surface plate device is in use. FIG. 6 is a perspective view illustrating a scribe line forming step. FIG. 7 is a partial cross-sectional view taken along line 7-7 in FIG. 6. FIG. 8 is a perspective view showing a glass plate with scribe lines placed on a protective sheet. FIG. 9 is a perspective view showing a glass article placed on a protective sheet. FIG. 10 is a flow diagram illustrating a method for manufacturing a glass article. FIG. 11 is a side view schematically showing a glass article. FIG. 12 is a photograph of an edge surface of a sample in Test Example 1. FIG. 13 is a photograph of an edge surface of a sample in Test Example 5. FIG. 14 is a plan view showing a paper sheet measurement sample. FIG. 15 is an explanatory diagram illustrating a method for measuring the amount of sagging.

[0026] Hereinafter, an embodiment of a method for manufacturing a glass plate with scribe lines, a method for manufacturing a glass article, a surface plate device, and a glass article will be described with reference to the drawings. Note that in the drawings, for the sake of convenience, some of the configurations may be shown exaggerated or simplified. Furthermore, the dimensional ratios of each part may differ from the actual ratios.

[0027] The method for manufacturing a glass plate with a scribe line is carried out using a surface plate apparatus. First, the surface plate apparatus and a protective sheet provided on the surface plate apparatus will be described. <Surface plate apparatus and protective sheet> As shown in Figures 1, 2, and 6, a surface plate apparatus 11 is used to place a glass plate G1 having a thickness of 0.2 mm or less in a process of forming a scribe line SL on the glass plate G1 using a tool T. The surface plate apparatus 11 has a surface plate main body 12 and a support layer 13 that supports the glass plate G1 having a thickness of 0.2 mm or less. The surface plate main body 12 of the surface plate apparatus 11 is made of a metal material.

[0028] The support layer 13 of the surface plate device 11 is made of a polymeric material. The polymeric material preferably includes at least one of rubber, elastomer, and synthetic resin. Examples of rubber include silicone rubber, urethane rubber, chloroprene rubber, styrene-butadiene rubber, and ethylene-propylene-diene rubber. Examples of elastomers include olefin-based elastomers, styrene-based elastomers, vinyl chloride-based elastomers, urethane-based elastomers, polyester-based elastomers, and polyamide-based elastomers. Examples of synthetic resins include polyolefin resins, polyester resins, vinyl chloride resins, polyamide resins, and polyimide resins.

[0029] The polymer material may have a porous structure or a non-porous structure. Examples of porous polymer materials include polymer foams. The support layer 13 may be made of a single type of polymer material, or may be made of multiple types of polymer materials. The support layer 13 may have a single-layer structure made of a single type of polymer material, or a multi-layer structure in which multiple polymer material layers are stacked.

[0030] The tensile modulus (Young's modulus) of the polymer material is preferably in the range of 1 MPa or more and 200 MPa or less. When the tensile modulus of the polymer material is 1 MPa or more, excessive deformation of the support layer 13 is suppressed, making it possible to more stably support the glass sheet G1. When the tensile modulus of the polymer material is 200 MPa or less, it is possible to further improve the function of the support layer 13 in absorbing the impact of the glass sheet G1 when forming the scribe line SL. The tensile modulus of the polymer material can be measured, for example, in accordance with JIS K7161:2014 (ISO527:2012).

[0031] The hardness of the polymer material is preferably in the range of A30 or more and A90 or less in Shore A hardness. When the Shore A hardness is A30 or more, excessive deformation of the support layer 13 is suppressed, making it possible to more stably support the glass sheet G1. When the Shore A hardness is A90 or less, it is possible to further improve the function of the support layer 13 in absorbing the impact of the glass sheet G1 when forming the scribe line SL. The Shore A hardness of the polymer material can be measured in accordance with JIS K 6253:2012.

[0032] The thickness of the support layer 13 of the surface plate device 11 is preferably in the range of 0.03 mm or more and 4 mm or less. When the thickness of the support layer 13 of the surface plate device 11 is 0.03 mm or more, it is possible to further improve the function of the support layer 13 in absorbing the impact of the glass sheet G1 when forming the scribe line SL. When the thickness of the support layer 13 of the surface plate device 11 is 4 mm or less, excessive deformation of the support layer 13 is suppressed, making it possible to more stably support the glass sheet G1.

[0033] 3 to 6, a protective sheet 14 for protecting the support layer 13 can be placed on the support layer 13 of the surface plate device 11 of this embodiment. The protective sheet 14 can be made of, for example, a paper sheet such as slip paper, a synthetic resin sheet, or the like.

[0034] The basis weight of the paper sheet is 10 g / m ２ Above, 200g / m ２The thickness of the paper sheet is preferably in the range of 10 μm to 250 μm, more preferably 40 μm to 150 μm.

[0035] The content of virgin pulp in the paper sheet is preferably in the range of 50% by mass or more and 100% by mass or less, and the content of recycled pulp in the paper sheet is preferably in the range of 0% by mass or more and 50% by mass or less. In other words, it is preferable that the paper sheet contains virgin pulp and either no recycled pulp or recycled pulp in an amount of 50% by mass or less.

[0036] The content of virgin pulp in the paper sheet is more preferably 60% by mass or more, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, 98% by mass or more, or 100%. The higher the content of virgin pulp in the paper sheet, the more improved the surface smoothness of the paper sheet, making it possible to suppress the occurrence of defective cracks other than median cracks along the scribe line SL.

[0037] The synthetic resin sheet may be a non-foamed resin sheet or a foamed resin sheet. Examples of the synthetic resin for the synthetic resin sheet include polyolefin resin, polyester resin, vinyl chloride resin, polyamide resin, and polyimide resin. The thickness of the synthetic resin sheet is preferably in the range of 0.02 mm or more and 1 mm or less.

[0038] In the protective sheet 14, the arithmetic mean height Sa of the support surface on which the glass plate G1 is placed is preferably 5.0 μm or less. The arithmetic mean height Sa of the support surface of the protective sheet 14 is more preferably 4.5 μm or less, 4.0 μm or less, 3.5 μm or less, 3.0 μm or less, 2.5 μm or less, 2.0 μm or less, or 1.5 μm or less. The smaller the arithmetic mean height Sa, the more improved the surface smoothness of the protective sheet 14, making it possible to suppress the occurrence of defective cracks other than median cracks along the scribe line SL. The lower limit of the arithmetic mean height Sa of the support surface of the protective sheet 14 is not particularly limited, but considering the productivity of the protective sheet 14, a value of 0.1 μm or more is realistic. Furthermore, it is more preferable that both main surfaces of the protective sheet 14 satisfy the above numerical range of the arithmetic mean height Sa. The arithmetic mean height Sa of the protective sheet 14 is measured in accordance with ISO 25178. The arithmetic mean height Sa of the protective sheet 14 is a value when the measurement area is 0.6 mm×0.4 mm.

[0039] The Young's modulus of the protective sheet 14 is preferably 1 GPa or more. The Young's modulus of the protective sheet 14 is more preferably 2 GPa or more, 3 GPa or more, 4 GPa or more, 5 GPa or more, 6 GPa or more, 7 GPa or more, 8 GPa or more, 9 GPa or more, or 10 GPa or more. The higher the Young's modulus of the protective sheet 14, the more it is possible to suppress the occurrence of defective cracks other than median cracks along the scribe line SL.

[0040] 7, the surface plate device 11 has a suction flow path FL that sucks the glass sheet G1 placed on the surface plate device 11. The suction flow path FL has an opening FL1 that opens on the upper surface of the surface plate body 12 of the surface plate device 11, and a support layer through-hole FL2 that penetrates the support layer 13. The support layer through-hole FL2 penetrates the support layer 13 so as to open on both main surfaces, which are the front and back surfaces of the support layer 13. The support layer through-hole FL2 communicates with the opening FL1 of the surface plate body 12.

[0041] Examples of methods for forming the support layer through-holes FL2 in the support layer 13 include piercing the support layer 13 with a needle and irradiating the support layer 13 with laser light. The support layer 13 is preferably fixed to the surface plate main body 12. The support layer 13 can be fixed to the surface plate main body 12 using, for example, an adhesive.

[0042] The protective sheet 14 has protective sheet through-holes 14a that penetrate the protective sheet 14 so as to open on both main surfaces, which are the front and back surfaces of the protective sheet 14. The protective sheet through-holes 14a are arranged so as to communicate with the suction flow paths FL of the surface plate device 11. Methods for forming the protective sheet through-holes 14a in the protective sheet 14 include, for example, piercing the protective sheet 14 with a needle, irradiating the protective sheet 14 with laser light, and the like.

[0043] The relationship between the diameter D1 of the opening FL1 in the base plate body 12 and the diameter D2 of the support layer through hole FL2 in the support layer 13 is not particularly limited. The diameter D2 of the support layer through hole FL2 is preferably the same as or smaller than the diameter D1 of the opening FL1 in the base plate body 12, and more preferably smaller than the diameter D1 of the opening FL1. In this case, the support layer 13 can more stably support the glass sheet G1. The relationship between the diameter D2 of the support layer through hole FL2 and the diameter D3 of the protective sheet through hole 14a is not particularly limited. The diameter D3 of the protective sheet through hole 14a is preferably the same as or smaller than the diameter D2 of the support layer through hole FL2. In this case, the protective sheet 14 can effectively protect the support layer 13.

[0044] 5 to 7 , a suction device P that sucks gas from the surface plate body 12 is connected to the surface plate body 12. The gas from the surface plate body 12 is exhausted by the suction device P, and the glass plate G1 is adsorbed onto the support layer 13. In this embodiment, the glass plate G1 is fixed to a protective sheet 14 that is disposed on the support layer 13.

[0045] <Method for manufacturing glass sheet with scribe lines> Next, a method for manufacturing a glass sheet with scribe lines will be described. As shown in Fig. 10 , the method for manufacturing a glass sheet with scribe lines includes a carrying-in step (step S1), a scribe line forming step (step S2), and a carrying-out step (step S3).

[0046] (Loading Process) As shown in FIGS. 3 to 5 , in the loading process of step S1, the glass plate G1 is loaded onto the surface plate device 11. In the loading process of step S1 of this embodiment, the protective sheet 14 is placed on the surface plate device 11 with the glass plate G1 placed on the protective sheet 14. The protective sheet 14 is placed between the support layer 13 of the surface plate device 11 and the glass plate G1. The protective sheet 14 protects the support layer 13 of the surface plate device 11. In this embodiment, the protective sheet 14 is used as a transport sheet for transporting the glass plate G1.

[0047] The upper limit of the thickness of the glass plate G1 is 0.2 mm or less, 0.1 mm or less, 0.085 mm or less, 0.060 mm or less, 0.055 mm or less, 0.040 mm or less, or 0.035 mm or less. The lower limit of the thickness of the glass plate G1 is, for example, 0.005 mm or more, or 0.01 mm or more.

[0048] The upper limit of the Young's modulus of the glass plate G1 is, for example, 80 GPa or less, preferably 78.0 GPa or less, 76.0 GPa or less, 75.0 GPa or less, 74.0 GPa or less, 73.0 GPa or less, 72.5 GPa or less, 72.0 GPa or less, 71.5 GPa or less, or 71.0 GPa or less. The lower limit of the Young's modulus of the glass plate G1 is preferably 65 GPa or more, more preferably 67 GPa or more, 68 GPa or more, or 69 GPa or more.

[0049] The planar shape of the glass plate G1 is not particularly limited. The planar shape of the glass plate G1 is, for example, a rectangular shape. Examples of glass constituting the glass plate G1 include soda glass, soda lime glass, borosilicate glass, aluminosilicate glass, and alkali-free glass. The glass plate G1 may be a glass plate for chemical strengthening. Examples of glass for chemical strengthening include soda glass and alkali aluminosilicate glass containing alkali metal oxides as a glass composition. The alkali metal oxide component contained in the alkali aluminosilicate glass as a glass composition is Li ２ O, Na ２ O and K ２ The glass for chemical strengthening is preferably an alkali aluminosilicate glass. The alkali aluminosilicate glass has a glass composition, in mass %, of, for example, SiO ２ :50~80%, Al ２ O ３ : 5-25%, B ２ O ３ : 0 to 15%, Li ２ O: 0-20%, Na ２ O: 1 to 20%, K ２ It is preferable to contain 0 to 10% of O. The glass composition of the glass plate with scribe lines and the glass composition of the glass article obtained by cutting the glass plate with scribe lines are the same as the glass composition of the glass plate G1.

[0050] (Scribe Line Forming Process) As shown in Figures 6 and 7, in the scribe line forming process of step S2, a scribe line SL is formed on the glass sheet G1 on the surface plate device 11 using a tool T. The scribe line SL is a crack line formed continuously on the planned dividing line of the glass sheet G1. More specifically, when the scribe line SL is formed on the glass sheet G1 using the tool T in the scribe line forming process of step S2, a median crack is generated, which is a crack that propagates from the scribe line SL in the thickness direction of the glass sheet G1. The median crack has a depth that does not penetrate the glass sheet G1 in the thickness direction.

[0051] In the scribe line forming process of step S2 of this embodiment, the glass sheet G1 is sucked using the suction flow path FL of the surface plate device 11, and the scribe line SL is formed as described above after the glass sheet G1 is fixed on the surface plate device 11. The scribe line SL is formed at a position that does not overlap with the opening FL1 of the surface plate body 12, the support layer through-hole FL2, and the protective sheet through-hole 14a in a plan view.

[0052] The tool T used in the scribe line forming process of step S2 includes a rotatable scribing wheel and a non-rotatable scribe tip. The cutting edge of the tool T is typically made of a superhard material such as diamond. The tool T is preferably a scribing wheel. The outer diameter of the scribing wheel is preferably in the range of 1 mm or more and 3 mm or less, and more preferably in the range of 1.5 mm or more and 2 mm or less. The angle of the cutting edge of the scribing wheel is not particularly limited, but is, for example, in the range of 90° or more and 160° or less. The cutting edge angle is the angle of the V-shaped tip in the cross section of the scribing wheel.

[0053] In the scribe line forming process of step S2, the tool T and the glass sheet G1 are moved relative to each other while the tool T is in contact with the glass sheet G1. A moving device that moves at least one of the tool T and the surface plate device 11 can be used to move the tool T relative to the glass sheet G1. In the scribe line forming process of step S2 of this embodiment, a moving device that moves the tool T is used. For example, the tool T is supported by a moving device such as a robot (not shown) with one or more axes, typically a three-axis robot. By driving this moving device, the tool T can be moved relative to the glass sheet G1. In the scribe line forming process of step S2 of this embodiment, a moving device that moves the scribing wheel causes the scribing wheel to run on the glass sheet G1, thereby forming a scribe line SL.

[0054] Note that a mechanism used to move a scribe tool in a well-known scribing device can be used as the mechanism of the moving device for the tool T. Furthermore, the relative movement between the tool T and the glass sheet G1 can also be performed manually by an operator without using a mechanical device.

[0055] 8, in the carrying-out step of step S3, the glass sheet G2 with scribe lines obtained in the scribe line forming step of step S2 is placed on the protective sheet 14, and the glass sheet G2 with scribe lines and the protective sheet 14 are carried out from the surface plate device 11. The carrying-out step of step S3 is performed after suction using the suction flow path FL of the surface plate device 11 has been stopped. The protective sheet 14 and the glass sheet G2 with scribe lines carried out in the carrying-out step of step S3 are placed on a carrying-out table (not shown).

[0056] <Glass Plate with Scribe Line> The scribe line SL of the glass plate G2 with scribe line may be straight or curved. The glass plate G2 with scribe line may have a plurality of scribe lines SL. The plurality of scribe lines SL of the glass plate G2 with scribe line may be arranged so as to extend parallel to one another, or may be arranged so as to intersect one another.

[0057] <Method of manufacturing glass article> Next, a method of manufacturing a glass article will be described. As shown in Fig. 10 , the method of manufacturing a glass article includes a dividing step (step S4) in addition to the above-mentioned carrying-in step of step S1, the scribe line forming step of step S2, and the carrying-out step of step S3.

[0058] 8 and 9 , in the dividing step of step S4, the glass plate G2 with scribe lines is divided along the scribe lines SL to obtain a glass article G3. In the dividing step of step S4, the glass plate G2 with scribe lines is divided while placed on the protective sheet 14.

[0059] In the dividing process of step S4, for example, the scribed glass sheet G2 is bent so that an external force is applied to the scribe lines SL. As a result, the scribe lines SL advance, dividing the scribed glass sheet G2. When applying an external force to the scribed glass sheet G2, it is preferable to bend the scribed glass sheet G2 so that tensile stress is generated on the main surface having the scribe lines SL, out of both main surfaces of the scribed glass sheet G2.

[0060] In the dividing step of step S4, for example, the scribe line-equipped glass sheet G2 can be divided by extending the scribe line SL using thermal stress generated by a temperature difference in the scribe line-equipped glass sheet G2.

[0061] <Glass Article> As shown in Figure 11, the glass article G3 is plate-shaped and has a thickness of 0.2 mm or less. The end surface G3a of the glass article G3 has a trace M of a median crack. More specifically, in the dividing process of step S4, the median crack in the scribe-lined glass plate G2 is propagated, thereby dividing the scribe-lined glass plate G2 along the scribe line SL. Therefore, the end surface G3a of the glass article G3 has a trace SLa of the scribe line and a trace M of the median crack. The trace SLa of the scribe line and the trace M of the median crack can be visually recognized, for example, as areas of different color tones, such as shades of color, in a photograph of the end surface of the glass article G3.

[0062] As shown in Figure 12, the depth dimension MD of the trace M of the median crack can be measured from the end surface photograph of the glass article G3 (sample SP1). The depth dimension MD of the trace M of the median crack is the maximum depth dimension MD ｍａｘ and the minimum depth dimension MD ｍｉｎ It has the following features.

[0063] Maximum depth dimension MD of median crack trace M in glass article G3 ｍａｘ and minimum depth dimension MD ｍｉｎ The difference ΔMD (ΔMD = MD ｍａｘ -MD ｍｉｎ) is preferably 8 μm or less. When this difference ΔMD is 8 μm or less, for example, it is possible to provide a glass article G3 having a stable end surface G3a of high quality. The maximum depth dimension MD of the glass article G3 ｍａｘ and the minimum depth dimension MD ｍｉｎ The difference ΔMD is more preferably 7 μm or less, and even more preferably 6 μm or less.

[0064] Average depth MD of median crack trace M ＡＶＲ It is preferable that the average depth MD is 20 μm or less. ＡＶＲ When the average depth MD is 20 μm or less, for example, a glass article G3 having a stable end surface G3a of high quality can be provided. ＡＶＲ is more preferably 18 μm or less, and even more preferably 15 μm or less. ＡＶＲ can be measured as described in the Examples below.

[0065] The average depth MD relative to the thickness t of the glass article G3 ＡＶＲ The ratio of the average depth MD ＡＶＲ divided by thickness t, MD ＡＶＲ / t is preferably 0.40 or less. ＡＶＲ When / t is 0.40 or less, for example, it is possible to provide a glass article G3 having a stable quality of the end surface G3a. ＡＶＲ is more preferably 0.35 or less, and even more preferably 0.30 or less.

[0066] In the manufacturing method of glass article G3, ΔMD, MD ＡＶＲ , and M.D. ＡＶＲ It is preferable to adjust conditions such as the load of the tool T in the scribe line forming step of step S2 so that at least one value selected from the following is within the above range:

[0067] <Test Examples> Next, test examples will be described. (Test Example 1) In test example 1, a sample of a glass plate with scribe lines was produced using the surface plate device 11 described above.

[0068] In Test Example 1, a glass plate A was used. The glass plate A had a glass composition, in mass %, of SiO ２ : 63.2%, Al ２ O ３ : 13.4%, B ２ O ３ : 2.4%, Li ２ O: 0.1%, Na ２ O: 12.9%, K ２ O: 0.6%, MgO: 2.8%, SnO ２ : 0.3%, TiO ２ : Contains 4.3%.

[0069] The thickness of the glass plate A is 50 μm. The planar dimensions of the glass plate A are 500 mm × 800 mm. The polymer material of the support layer 13 in the surface plate device 11 is rubber (chloroprene rubber). The support layer 13 used is a rubber sheet with both main surfaces flat and with support layer through holes FL2 formed therein. The thickness of the support layer 13 is 1 mm. The Shore A hardness of the polymer material is A65. The tensile modulus of the polymer material is 2.89 MPa.

[0070] The glass sheet A was sucked onto the surface plate device 11 by suction through the suction flow path FL of the surface plate device 11. After applying a load from the tool T to the glass sheet A placed on the surface plate device 11, the tool T was run along the glass sheet A to form a scribe line SL on the glass sheet A. The load applied to the glass sheet A from the tool T was set using the air pressure of an air cylinder connected to the tool T. A sample glass sheet with scribe lines was produced by forming 10 scribe lines SL on the glass sheet A under the same load conditions. A scribing wheel (outer diameter: 1.8 mm, running speed: 500 mm / s) was used as the tool T. The length of the scribe line SL was 600 mm.

[0071] A cutting test was conducted on a sample of the glass plate with scribe lines, in which the sample was cut along each scribe line SL. In this cutting test, the sample of the glass plate with scribe lines was cut by bending the sample so that tensile stress was generated on the main surface side having the scribe lines SL.

[0072] In the breaking test using 10 scribe lines SL, a pass / fail judgment was made in which a glass plate was broken along the scribe lines SL for all 10 scribe lines SL. Next, the load applied to the glass plate A from the tool T was changed, and a glass plate sample with scribe lines was prepared in the same manner as above, after which a breaking test and a pass / fail judgment were performed. By performing the breaking test with the load changed in this way, the load range ΔW for passing the pass / fail judgment was determined. The results are shown in Table 1.

[0073] The range of loads ΔW that pass the breaking test can be calculated by ΔW = W1 - W2, where W1 is the maximum load that passes and W2 is the minimum load that passes. ｍ The results are shown in Table 1.

[0074] In Test Example 1 and the following Test Examples, similar results were obtained even when the outer diameter of the scribing wheel used as tool T was changed to a range of 1.5 to 2 mm. - Median Crack Depth Evaluation Test In the median crack depth evaluation test, first, the load applied from tool T to glass plate A was fixed at 0.6 [N], and three samples of glass plates with scribe lines were prepared under the same conditions and procedures as above, except that one scribe line SL was formed on glass plate A. Next, six glass article samples were obtained by dividing the three scribe line-formed glass plate samples. Next, the divided surface of the obtained glass article sample, i.e., the end face of the sample, was imaged, and an approximation line parallel to the surface of the sample was drawn based on the trace contour line of the median crack on the end face in the obtained image. The position of the approximation line was determined by the least squares method so that the sum of the distances from each point on the contour line to the approximation line was minimized. The distance (depth) of the approximation line from the surface of the sample was calculated using the average depth MD of the sample. ＡＶＲ The MD shown in Table 1 was [μm]. ＡＶＲ The value of [μm] is the average depth MD obtained for each of the six glass article samples. ＡＶＲ The average value of [μm].

[0075] Also, the MD of the glass article sample relative to the thickness t [μm] ＡＶＲ[μm] ratio (ratio = MD ＡＶＲ / t) was calculated. The results are shown in Table 1. (Test Example 2) In Test Example 2, a sample of a glass plate with scribe lines was prepared in the same manner as in Test Example 1, except that a protective sheet 14 was placed between the support layer 13 of the surface plate device 11 and the glass plate A. As the protective sheet 14, a paper sheet, namely, an interleaf paper (recycled paper: 100% recycled pulp), was used. The thickness of the interleaf paper was 0.109 mm. The basis weight of the interleaf paper was 65 g / m ２ is.

[0076] Next, a breaking test was carried out on a sample of the glass plate with scribe lines in the same manner as in Test Example 1, and the load range ΔW and the median value W of the load range ΔW were calculated. ｍ In addition, by carrying out a median crack depth evaluation test in the same manner as in Test Example 1, the MD ＡＶＲ And the above MD ＡＶＲ The results are shown in Table 1.

[0077] Test Example 3 In Test Example 3, a sample of a glass plate with scribe lines was prepared in the same manner as in Test Example 1, except that the support layer 13 in the surface plate device 11 was changed. The polymer material of the support layer 13 in Test Example 3 was a synthetic resin (polyethylene terephthalate). The thickness of this support layer 13 was 0.05 mm. The tensile modulus of elasticity of the synthetic resin was 181 MPa.

[0078] Next, a breaking test was carried out on a sample of the glass plate with scribe lines in the same manner as in Test Example 1, and the load range ΔW and the median value W of the load range ΔW were calculated. ｍ The results are shown in Table 1.

[0079] Test Example 4 In Test Example 4, a sample of a glass plate with scribe lines was prepared in the same manner as in Test Example 1, except that the support layer 13 in the surface plate device 11 was changed. The polymer material of the support layer 13 in Test Example 3 was a synthetic resin (polyethylene terephthalate). The thickness of this support layer 13 was 0.1 mm. The tensile modulus of elasticity of the synthetic resin was 181 MPa.

[0080] Next, a breaking test was carried out on a sample of the glass plate with scribe lines in the same manner as in Test Example 1, and the load range ΔW and the median value W of the load range ΔW were calculated.ｍ The results are shown in Table 1.

[0081] Test Example 5 In Test Example 5, a sample of a glass plate with scribe lines was prepared in the same manner as in Test Example 1, except that the support layer 13 of the surface plate device 11 was omitted.

[0082] Next, a separation test was carried out on the sample of the glass plate with the scribe lines in the same manner as in Test Example 1. In addition, a median crack depth evaluation test was carried out in the same manner as in Test Example 1, and the MD ＡＶＲ And the above MD ＡＶＲ The results are shown in Table 1.

[0083] Test Example 6 In Test Example 6, a sample of a glass plate with scribe lines was prepared in the same manner as in Test Example 1, except that glass plate A was changed to glass plate B. Glass plate B had a glass composition of, in mass %, SiO ２ : 61.5%, Al ２ O ３ : 18%, B ２ O ３ : 0.5%, Li ２ O: 0.1%, Na ２ O: 14.5%, K ２ O: 2%, MgO: 3%, SnO ２ : Contains 0.4%.

[0084] The thickness of the glass plate B is 35 μm. The planar dimensions of the glass plate B are 400 mm × 500 mm. Next, a breaking test is performed on a sample of the glass plate with scribe lines in the same manner as in Test Example 1, and the load range ΔW and the median value W of the load range ΔW are obtained. ｍ In addition, by carrying out a median crack depth evaluation test in the same manner as in Test Example 1, the MD ＡＶＲ And the above MD ＡＶＲ The results are shown in Table 2.

[0085] Test Example 7 In Test Example 7, a sample of a glass plate with scribe lines was prepared in the same manner as in Test Example 6, except that a protective sheet 14 was placed between the support layer 13 of the surface plate device 11 and the glass plate B. A synthetic resin sheet (polyethylene terephthalate sheet) was used as the protective sheet 14. The thickness of this protective sheet 14 was 0.1 mm.

[0086] Next, a breaking test was carried out on a sample of the glass plate with scribe lines in the same manner as in Test Example 1, and the load range ΔW and the median value W of the load range ΔW were calculated. ｍ In addition, by carrying out a median crack depth evaluation test in the same manner as in Test Example 1, the MD ＡＶＲ And the above MD ＡＶＲ The results are shown in Table 2.

[0087] Test Example 8 In Test Example 8, a sample of a glass plate with scribe lines was prepared in the same manner as in Test Example 6, except that a protective sheet 14 was placed between the support layer 13 of the platen device 11 and the glass plate B. A synthetic resin sheet (a foamed polyethylene sheet) was used as the protective sheet 14. The thickness of this protective sheet 14 was 0.2 mm.

[0088] Next, a breaking test was carried out on a sample of the glass plate with scribe lines in the same manner as in Test Example 1, and the load range ΔW and the median value W of the load range ΔW were calculated. ｍ The results are shown in Table 2.

[0089] Test Example 9 In Test Example 9, a sample of a glass plate with scribe lines was prepared in the same manner as in Test Example 6, except that the support layer 13 in the surface plate device 11 was changed. The polymer material of the support layer 13 in Test Example 9 was a synthetic resin (polyethylene terephthalate). The thickness of this support layer 13 was 0.1 mm. The tensile modulus of elasticity of the synthetic resin was 181 MPa.

[0090] Next, a breaking test was carried out on a sample of the glass plate with scribe lines in the same manner as in Test Example 1, and the load range ΔW and the median value W of the load range ΔW were calculated. ｍ The results are shown in Table 2.

[0091]

[0092]

[0093] (Results) In the above-described breaking test, the existence of a pass load [N] makes it possible to easily improve the yield in the production of glass article G3. Furthermore, the larger the pass load range ΔW [N] in the breaking test, the easier it is to set the conditions for the scribe line formation process. This improves the stability of breaking, and ultimately the manufacturing stability of glass article G3. Based on this knowledge, the manufacturing stability of glass article G3 was evaluated according to the following criteria.

[0094] If the results of the breaking test showed that there was a passable load [N] and that the load range ΔW [N] was 0.2 N or more, the glass article G3 was judged to have excellent manufacturing stability (A).If the results of the breaking test showed that there was a passable load [N] and that the load range ΔW [N] was less than 0.2 N, the glass article G3 was judged to have good manufacturing stability (B).

[0095] When the breaking test did not result in a pass load [N], the glass article G3 was judged to have poor manufacturing stability (C). The evaluation results of the manufacturing stability of the glass article G3 in each test example are shown in Tables 1 and 2.

[0096] As shown in Table 1, excellent or good manufacturing stability of the glass article G3 was obtained in Test Examples 1 to 4. On the other hand, Test Example 5 showed poor manufacturing stability of the glass article G3.

[0097] As shown in Table 2, in Test Examples 6 to 9, the manufacturing stability of the glass article G3 was excellent or good. Fig. 12 shows a photograph of the end surface G3a of the glass article sample SP1 of Test Example 1. The maximum depth dimension MD of the trace M of the median crack in this glass article sample SP1 ｍａｘ and minimum depth dimension MD ｍｉｎ The difference ΔMD between the above values ​​was 8 μm or less.

[0098] The difference ΔMD in the glass article samples of Test Examples 2 to 4 and Test Examples 6 to 9 was also 8 μm or less. Figure 13 shows a photograph of the end surface G3a of sample SP2, which was able to be separated from the glass article samples of Test Example 5. The maximum depth dimension MD of the trace M of the median crack in sample SP2 of this glass article ｍａｘ and minimum depth dimension MD ｍｉｎ The difference ΔMD between the maximum depth dimension MD of the trace M of the median crack on the glass plate with the scribe lines was more than 8 μm. ｍａｘ and minimum depth dimension MD ｍｉｎ It can be seen that the smaller the difference ΔMD between the above values, the higher the manufacturing stability of the glass article G3.

[0099] (Study on the type of protective sheet (paper sheet)) Next, the type of protective sheet (paper sheet) used in Test Example 2 was studied. (Test Examples 2-1 and 2-2) As shown in Table 3, in Test Examples 2-1 and 2-2, samples of glass plates with scribe lines were prepared in the same manner as in Example 2, except that the type of paper sheet used as the protective sheet was changed.

[0100] The Young's modulus in Table 3 can be calculated by the following formula.

[0101]

[0102] δ: sagging amount w: load per unit length I: moment of inertia E: Young's modulus To measure the sagging amount δ, a paper sheet measurement sample PS shown in FIG. 14 was first prepared. This paper sheet measurement sample PS was left to stand for 48 hours in an environment at a temperature of 23°C and a relative humidity of 50%. Next, under this environment, as shown in FIG. 15, the measurement sample PS was supported by the measurement jig 15 by clamping a range of 5 mm from the edge of the measurement sample PS with the support surface AX of the measurement sample PS as the upper surface. At this time, the sagging amount δ of the measurement sample PS was measured. Similarly, the sagging amount δ was measured by supporting the measurement sample PS on the measurement jig 15 with the support surface BX opposite the support surface AX as the upper surface. Similarly, the sagging amount δ was measured with the support surface AY along the edge perpendicular to the edge along which the support surface AX runs and the support surface BY opposite the support surface AY as the upper surface. The results of calculating the median of the four sagging amounts δ are shown in Table 3. When the median of the sagging amounts δ was used as the sagging amount δ in the above formula, Young's modulus E was calculated.

[0103] Next, a breaking test was carried out on a sample of the glass plate with scribe lines in the same manner as in Test Example 1, and the load range ΔW and the median value W of the load range ΔW were calculated. ｍ The median value W of the load range ΔW was also calculated. ｍ In this test, 21 scribe lines SL (13 in the vertical direction and 8 in the horizontal direction) were formed in a total of 21 scribe lines SL. The number of scribe lines SL in which a defective crack other than the median crack occurred was counted, and the defective crack occurrence rate was calculated. The results are shown in Table 3.

[0104]

[0105] As shown in Table 3, it can be seen that the rate of occurrence of defective cracks is lower in Test Examples 2-1 and 2-2 than in Test Example 2. <Functions and Effects> Next, the functions and effects of this embodiment will be described.

[0106] (1) The method for manufacturing a glass sheet G2 with a scribe line includes a loading step S1 and a scribe line forming step S2. In the loading step S1, a glass sheet G1 having a thickness of 0.2 mm or less is loaded onto a surface plate device 11. In the scribe line forming step S2, a scribe line SL is formed on the glass sheet G1 on the surface plate device 11 using a tool T. The surface plate device 11 has a support layer 13 that supports the glass sheet G1. The support layer 13 of the surface plate device 11 is made of a polymer material.

[0107] According to this method, by constructing the support layer 13 of the surface plate device 11 used in the scribe line forming process of step S2 from a polymer material, the support layer 13 can absorb the impact when the scribe line SL is formed on the glass sheet G1. In this scribe line forming process of step S2, it is possible to easily suppress changes in the shape of the cracks formed along the scribe line SL over the entire length of the scribe line SL. Therefore, it is possible to easily achieve stable cutting using the scribe line SL.

[0108] (2) In the method for manufacturing the glass sheet G2 with a scribe line, the polymer material constituting the support layer 13 of the surface plate device 11 preferably contains at least one of rubber, elastomer, and synthetic resin. In this case, the function of the support layer 13 in absorbing the impact when the scribe line SL is formed on the glass sheet G1 can be easily enhanced. Therefore, it becomes possible to more easily achieve stable cutting using the scribe line SL.

[0109] (3) When the thickness of the support layer 13 of the surface plate device 11 is 0.03 mm or more, the function of the support layer 13 in absorbing the impact on the glass sheet G1 when the scribe line SL is formed can be further improved. This makes it possible to more easily achieve stable cutting using the scribe line SL. Furthermore, when the thickness of the support layer 13 is 4 mm or less, excessive deformation of the support layer 13 can be suppressed, making it possible to more stably support the glass sheet G1.

[0110] (4) When the tensile modulus of the polymer material constituting the support layer 13 of the surface plate device 11 is 1 MPa or more, excessive deformation of the support layer 13 is suppressed, thereby making it possible to more stably support the glass sheet G1. Furthermore, when the tensile modulus of the polymer material is 200 MPa or less, it is possible to further improve the function of the support layer 13 in absorbing the impact on the glass sheet G1 when forming the scribe line SL, making it possible to more easily achieve stable separation using the scribe line SL.

[0111] (5) The surface plate device 11 has a suction flow path FL that sucks the glass sheet G1 placed on the surface plate device 11. In the scribe line forming process of step S2, the glass sheet G1 placed on the surface plate device 11 is fixed to the surface plate device 11 by sucking using the suction flow path FL, and then a scribe line SL is formed on the glass sheet G1. In this case, for example, it is possible to further improve the positional accuracy of the scribe line SL. Therefore, it is possible to improve the quality of the glass article G3 divided using the scribe line SL and to improve the yield of the glass article G3.

[0112] (6) In the scribe line forming process of step S2, a protective sheet 14 for protecting the support layer 13 is placed between the support layer 13 of the surface plate device 11 and the glass plate G1, and then a scribe line SL is formed on the glass plate G1 on the protective sheet 14. In this case, by protecting the support layer 13 of the surface plate device 11 with the protective sheet 14, for example, it is possible to suppress the occurrence of scratches on the support layer 13 and the adhesion of foreign matter. Therefore, it is possible to increase the durability of the support layer 13 of the surface plate device 11 and reduce the frequency of replacement.

[0113] (7) The protective sheet 14 is 10 g / m ２ Above, 200g / m ２ The protective sheet 14 may include a paper sheet having a basis weight within the following range: 1. The protective sheet 14 may also include a synthetic resin sheet having a thickness within the range of 0.02 mm or more and 1 mm or less. In this case, the mechanical strength of the protective sheet 14 can be ensured while the amount of material used for the protective sheet 14 can be reduced.

[0114] (8) In the protective sheet 14, the arithmetic mean height Sa of the support surface on which the glass plate G1 is placed is preferably 5.0 μm or less. The Young's modulus of the protective sheet 14 is preferably 1 GPa or more. When the protective sheet 14 is a paper sheet, the virgin pulp content in the paper sheet is preferably in the range of 50% by mass or more and 100% by mass or less, and the recycled pulp content in the paper sheet is preferably in the range of 0% by mass or more and 50% by mass or less. When such a paper sheet is used, it is possible to suppress the occurrence of defective cracks other than median cracks along the scribe line SL. Therefore, it is possible to further improve the quality of the outer peripheral edge of the glass article G3 obtained by cutting along the scribe line SL.

[0115] (9) In the carrying-in process of step S1, the glass plate G1 is placed on the protective sheet 14, and the protective sheet 14 is placed on the support layer 13 of the surface plate device 11. In this case, the glass plate G1 can be easily carried in by utilizing the protective sheet 14.

[0116] Furthermore, it is possible to easily ensure the cleanliness of the glass sheet G1 and prevent scratches from occurring on the glass sheet G1, and therefore it is possible to easily stabilize the quality of the glass sheet G2 with scribe lines.

[0117] (10) The method for manufacturing a glass sheet G2 with scribe lines includes a carrying-out step S3. In the carrying-out step S3, the glass sheet G2 with scribe lines and the protective sheet 14 are carried out of the surface plate device 11 while the glass sheet G2 with scribe lines is placed on the protective sheet 14. In this case, the glass sheet G2 with scribe lines can be easily carried out of the surface plate device 11 by using the protective sheet 14.

[0118] Furthermore, for example, it is possible to prevent unnecessary force from being applied to the glass sheet G2 with scribe lines when the glass sheet G2 with scribe lines is carried out from the surface plate device 11. Furthermore, for example, it is possible to easily ensure the cleanliness of the glass sheet G2 with scribe lines and to prevent the glass sheet G2 with scribe lines from being scratched. Therefore, it is possible to easily stabilize the quality of the glass sheet G2 with scribe lines.

[0119] (11) A method for manufacturing a glass article G3 includes a carrying-in step S1, a scribe line forming step S2, and a dividing step S4. In the dividing step S4, the glass plate G2 with scribe lines is divided along the scribe lines SL to obtain a glass article G3. This method, as described in section (1) above, makes it possible to easily achieve stable division using the scribe lines SL. This makes it possible to easily improve the manufacturing stability of glass articles G3 having a thickness of 0.2 mm or less.

[0120] (12) The manufacturing method of the glass article G3 further includes a carrying-out step S3, whereby the glass plate G2 with scribe lines placed on the protective sheet 14 can be divided in the dividing step S4. In this case, the dividing step S4 after the carrying-out step S3 can be smoothly performed. In addition, for example, it is possible to easily ensure the cleanliness of the glass article G3 and prevent scratches on the glass article G3. Therefore, it is possible to easily stabilize the quality of the glass article G3.

[0121] <Modifications> The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0122] In the manufacturing method of the glass article G3, the dividing process of step S4 can be changed to a process of dividing the glass plate G2 with scribe lines after removing the protective sheet 14 on which the glass plate G2 with scribe lines is placed.

[0123] In the method for manufacturing the glass article G3, the glass plate G2 with scribe lines may not be removed from the platen device 11, and the dividing step of step S4 may be performed on the platen device 11. In the method for manufacturing the glass plate G2 with scribe lines, the glass plate G1 and the protective sheet 14 may be separately loaded into the platen device 11.

[0124] In the method for manufacturing the glass plate G2 with scribe lines, the glass plate G2 with scribe lines and the protective sheet 14 may be carried out separately from the platen device 11. In the method for manufacturing the glass plate G2 with scribe lines, the scribe line forming step of step S2 may be performed without using the protective sheet 14.

[0125] The support layer 13 of the surface plate device 11 may be configured to be detachable from the surface plate body 12. In this case, the glass plate G1 may be loaded into the surface plate body 12 while it is placed on the support layer 13. Also, the glass plate G2 with scribe lines may be loaded onto the support layer 13 and then unloaded from the surface plate body 12.

[0126] The platen body 12 of the platen device 11 may be made of the same material as the support layer 13. However, the platen body 12 is preferably made of a material harder than the support layer 13, and more preferably made of a metal material.

[0127] In the method for manufacturing the glass sheet G2 with a scribe line, the scribe line forming step S2 can also be performed without fixing the glass sheet G1 on the surface plate device 11. In other words, the suction flow path FL of the surface plate device 11 can be omitted.

[0128] In the method for manufacturing the glass sheet G2 with a scribe line, the scribe line forming step of step S2 can also be performed by moving the surface plate device 11 without moving the tool T. <Notes> The technical ideas that can be understood from the above-described embodiment and modified examples will be described.

[0129] (Appendix 1) A scribe line forming device for forming a scribe line on a glass plate having a thickness of 0.2 mm or less, comprising: a platen device for placing the glass plate; a tool for forming a scribe line on the glass plate; and a moving device for moving the tool and the platen device relative to one another; the platen device having a support layer for supporting the glass plate, the support layer being made of a polymer material.

[0130] (Appendix 2) A glass article manufacturing apparatus used in the manufacture of glass articles, which comprises a step of forming a scribe line on a glass plate having a thickness of 0.2 mm or less, the apparatus comprising: a platen device for placing the glass plate; a tool for forming a scribe line on the glass plate; and a moving device for moving the tool and the platen device relative to one another; the platen device having a support layer for supporting the glass plate, the support layer being made of a polymer material.

[0131] 11...Surface plate device 13...Support layer 14...Protective sheet G1...Glass plate G2...Glass plate with scribe line G3...Glass article G3a...End surface SL...Scribe line T...Tool FL...Suction flow path M...Trace of median crack SLa...Trace of scribe line

Claims

1. A method for manufacturing a glass plate with a scribe line, comprising: a loading step of loading a glass plate having a thickness of 0.2 mm or less onto a platen device; and a scribe line forming step of forming a scribe line on the glass plate on the platen device using a tool, wherein the platen device has a support layer that supports the glass plate, and the support layer is made of a polymeric material.

2. The method for producing a glass plate with scribe lines according to claim 1, wherein the polymer material of the support layer includes at least one of rubber, elastomer, and synthetic resin.

3. The method for producing a glass plate with scribe lines according to claim 2, wherein the thickness of the support layer is within the range of 0.03 mm or more and 4 mm or less.

4. The method for producing a glass plate with scribe lines according to claim 2, wherein the tensile modulus of elasticity of the polymer material of the support layer is within the range of 1 MPa or more and 200 MPa or less.

5. A method for manufacturing a glass plate with a scribe line as described in claim 1, wherein the platen device has a suction flow path for sucking in the glass plate placed on the platen device, and in the scribe line forming process, the glass plate placed on the platen device is fixed onto the platen device by sucking in the suction flow path, and then the scribe line is formed on the glass plate.

6. A method for manufacturing a glass plate with a scribe line as described in claim 1, wherein in the scribe line forming step, a protective sheet for protecting the support layer is placed between the support layer and the glass plate, and then the scribe line is formed on the glass plate on the protective sheet.

7. The protective sheet has a thickness of 10 g / m ２ Above, 200g / m ２ The method for producing a glass plate with scribe lines according to claim 6, comprising at least one of a paper sheet having a basis weight within the following range and a synthetic resin sheet having a thickness within the range of 0.02 mm or more and 1 mm or less.

8. A method for manufacturing a glass plate with scribe lines as described in claim 7, wherein the content of virgin pulp in the paper sheet is in the range of 50% by mass or more and 100% by mass or less, and the content of recycled pulp in the paper sheet is in the range of 0% by mass or more and 50% by mass or less.

9. A method for manufacturing a glass plate with a scribe line according to any one of claims 6 to 8, wherein the arithmetic mean height Sa of the support surface of the protective sheet on which the glass plate is placed is 5 μm or less.

10. A method for manufacturing a glass plate with scribe lines according to any one of claims 6 to 8, wherein the Young's modulus of the protective sheet is 1 GPa or more.

11. A method for manufacturing a glass plate with scribe lines as described in any one of claims 6 to 8, wherein in the carrying step, the glass plate is placed on the protective sheet, and the protective sheet is then placed on the support layer of the platen device.

12. A method for manufacturing a glass plate with scribe lines as described in any one of claims 6 to 8, further comprising a removal step of removing the glass plate with scribe lines and the protective sheet from the platen device while the glass plate with scribe lines is placed on the protective sheet.

13. A method for manufacturing a glass article, comprising: a loading step of loading a glass plate having a thickness of 0.2 mm or less onto a surface plate device; a scribe line forming step of forming a scribe line on the glass plate on the surface plate device using a tool; and a cutting step of cutting the scribed glass plate along the scribe line to obtain the glass article, wherein the surface plate device has a support layer that supports the glass plate, and the support layer is made of a polymeric material.

14. A method for manufacturing a glass article as described in claim 13, wherein in the scribe line forming step, a protective sheet for protecting the support layer is placed between the support layer and the glass plate, and then the scribe line is formed on the glass plate on the protective sheet, and the manufacturing method further includes a carrying out step of carrying out the glass plate with the scribe line and the protective sheet from the platen device while the glass plate with the scribe line is placed on the protective sheet, and in the dividing step, the glass plate with the scribe line while placed on the protective sheet is divided.

15. A platen device used for placing a glass plate having a thickness of 0.2 mm or less in a process of forming a scribe line on the glass plate using a tool, the platen device having a support layer that supports the glass plate, the support layer being made of a polymeric material.

16. A plate-shaped glass article having a thickness of 0.2 mm or less, the end surface of the glass article having a trace of a scribe line and a trace of a median crack, and the maximum depth dimension MD of the trace of the median crack ｍａｘ and minimum depth dimension MD ｍｉｎ The difference ΔMD between ｍａｘ -MD ｍｉｎ ) is 8 μm or less.

17. The average depth of the trace of the median crack is MD ＡＶＲ and the thickness of the glass article is t, MD ＡＶＲ 17. The glass article of claim 16, wherein / t is 0.45 or less.

18. MD is the average depth of the median crack trace ＡＶＲ The glass article according to claim 16 or 17, wherein the thickness is 20 μm or less.

Images