WO2023218966A1 - Glass plate manufacturing method, glass plate, and glass plate packaging body - Google Patents

Glass plate manufacturing method, glass plate, and glass plate packaging body Download PDF

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Publication number
WO2023218966A1
WO2023218966A1 PCT/JP2023/016482 JP2023016482W WO2023218966A1 WO 2023218966 A1 WO2023218966 A1 WO 2023218966A1 JP 2023016482 W JP2023016482 W JP 2023016482W WO 2023218966 A1 WO2023218966 A1 WO 2023218966A1
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WIPO (PCT)
Prior art keywords
glass plate
median crack
maximum depth
scribe line
scribe
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PCT/JP2023/016482
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French (fr)
Japanese (ja)
Inventor
隼人 奥
茂嘉 伊藤
拡志 澤里
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日本電気硝子株式会社
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Publication of WO2023218966A1 publication Critical patent/WO2023218966A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor

Definitions

  • the present invention relates to a method for manufacturing a glass plate, a glass plate, and a glass plate package.
  • a method for manufacturing a glass plate As is well known, for example, displays such as liquid crystal displays and organic EL displays use glass plates as glass substrates and cover glasses. BACKGROUND ART As a method for manufacturing a glass plate, a method using a down-draw method represented by an overflow down-draw method, a slot down-draw method, and a redraw method is widely adopted. An example of a method for manufacturing a glass plate using the overflow down-draw method is as shown below.
  • the method for manufacturing a glass plate includes a forming step of forming a glass ribbon, and a first cutting step (X cutting step) of cutting out a glass plate from the formed glass ribbon by scribe cutting. Implement.
  • molten glass is supplied to an overflow groove provided at the top of the wedge-shaped molded body and is caused to overflow.
  • the overflowing molten glass is allowed to flow down along the side surfaces of the molded body, and then fused and integrated at the lower end of the molded body. Thereby, a plate-shaped glass ribbon is formed.
  • the formed glass ribbon is drawn downward while being held between both front and back sides by pairs of rollers arranged in a plurality of upper and lower stages. At both widthwise end portions of the glass ribbon obtained in this manner, ear portions each having a thickness larger than the widthwise central portion are formed.
  • the scribe cutting performed in the first cutting process forms a scribe line along the width direction on the main surface of the glass ribbon being conveyed downward, and curves the peripheral area of the scribe line to apply bending stress to the scribe line.
  • the glass ribbon is cut along the Thereby, a rectangular glass plate is cut out from the glass ribbon.
  • the scribe cutting performed in the second cutting step forms a scribe line along the vertical direction on the main surface on the widthwise end side of the glass plate held in the vertical position. Thereafter, the glass ribbon is cut along the scribe line by bending the area around the scribe line to apply bending stress. This scribe cutting is performed separately on one end side and the other end side in the width direction of the glass plate. As a result, a glass plate having no ears at both ends in the width direction is obtained.
  • the conveying device has a holding section made of a chuck or the like that holds the upper part of the glass plate.
  • the glass plate is conveyed in a vertically suspended state by having its upper part held by the holding section.
  • a glass plate package is formed by packing a plurality of glass plates in a vertical position on a pallet.
  • the glass plate package is transferred to the next process or stored until the next process is performed.
  • JP2017-202958A Japanese Patent Application Publication No. 2017-226549 Japanese Patent Application Publication No. 2020-75752
  • the glass plate packed in the glass plate package has scribe marks left on both end faces in the width direction due to the formation of scribe lines.
  • the present invention has been made in view of the above circumstances, and its technical objective is to prevent damage to glass plates stacked vertically on a pallet.
  • the present invention is intended to solve the above-mentioned problems, and is a method for manufacturing a glass plate, comprising a cutting step of removing widthwise ends of the glass plate while the glass plate is supported in a vertical position.
  • the cutting step includes a scribing step of forming a scribe line including a median crack on the glass plate in the vertical direction using a scribe tool, and a bending stress is applied to the glass plate on which the scribe line is formed to break it.
  • the scribe line is formed such that the maximum depth of the median crack at the middle part of the scribe line is shallower than the maximum depth of the median crack at the lower part of the scribe line. It is characterized by the formation of
  • the maximum depth of the median crack at the middle part of the scribe line shallow, the maximum depth of the median crack of the scribe mark at the middle part of the end face in the width direction of the glass plate after the cutting process is made shallow. can do. Thereby, even if bending stress due to shaking of the glass plate acts on the glass plate while the glass plate is being conveyed in a vertical position, it is possible to prevent cracks from occurring in the intermediate portion of the end face of the glass plate. This makes it possible to prevent damage to the glass plates stacked vertically on the pallet.
  • the maximum depth of the median crack at the bottom of the scribe line deeper than the maximum depth of the median crack at the middle of the scribe line, it is possible to prevent cutting defects at the bottom of the scribe line during the splitting process.
  • the glass plate can be cut with high precision.
  • the maximum depth of the median crack in the middle part of the scribe line may be shallower than the maximum depth of the median crack in the upper part of the scribe line.
  • the crack is spread from the upper part of the scribe line to the lower intermediate part and the lower part in the breaking process. It can be stably developed toward the bottom. This makes it possible to prevent cutting defects from occurring during the cutting process. Furthermore, even if the glass plate is warped, it is possible to break the glass plate without causing cutting defects.
  • the maximum depth of the median crack at the upper part of the scribe line may be shallower than the maximum depth of the median crack at the intermediate part of the scribe line.
  • the maximum depth of the median crack at the top of the scribe line shallow, the maximum depth of the median crack of the scribe mark remaining at the top of the end face in the width direction of the glass plate formed by the breaking process is reduced. You can make it shallower. Thereby, even when the upper part of the glass plate is held by a holding means such as a chuck when manufacturing the glass plate package, it is possible to prevent the upper part of the glass plate from being damaged due to impact during transportation or the like.
  • the present invention is intended to solve the above problems, and is a glass plate package comprising rectangular glass plates and a pallet on which the glass plates are stacked in a vertical position, the glass plates having a width It has an end face extending in the vertical direction at the end of the direction, the end face is a folding surface having a scribe mark including a median crack, and the maximum depth of the median crack in the middle part of the end face is: It is characterized in that the depth is shallower than the maximum depth of the median crack at the lower part of the end face.
  • the maximum depth of the median crack at the intermediate portion of the end face may be shallower than the maximum depth of the median crack at the upper part of the end face.
  • the maximum depth of the median crack at the upper part of the end face may be shallower than the maximum depth of the median crack at the middle part of the end face.
  • the present invention is intended to solve the above-mentioned problems, and is a rectangular glass plate having an end face extending in the sheet drawing direction, the end face being a breaking surface having a scribe mark including a median crack.
  • the maximum depth of the median crack at an intermediate portion of the end face in the board drawing direction is shallower than the maximum depth of the median crack at one end of the end face in the board drawing direction.
  • FIG. 1 to 9 show an embodiment of a glass plate, a method for manufacturing the same, and a glass plate package according to the present invention.
  • the method for manufacturing a glass plate according to the present invention mainly includes a forming step S1, a first cutting step S2, a second cutting step S3, and a packing step S4.
  • the molding step S1 is a step of molding the glass ribbon GR from the molten glass GM. As shown in FIG. 2, in the molding step S1, molten glass GM is supplied to the overflow groove 1a at the top of the wedge-shaped molded body 1 and is caused to overflow. The overflowing molten glass GM is allowed to flow down along the side surfaces of the molded body 1, and then fused and integrated at the lower end of the molded body 1.
  • a plate-shaped glass ribbon GR is formed. Thereafter, the formed glass ribbon GR is drawn downward while being held between both front and back sides by pairs of rollers (not shown) arranged in a plurality of upper and lower stages. A cooling roller pair is arranged at the top of the roller pairs arranged in a plurality of upper and lower stages.
  • the board drawing direction Y in the forming process S1 is set along the up-down direction.
  • the molded glass ribbon GR has a first main surface 2 and a second main surface 3.
  • a glass ribbon GR is illustrated in which the first main surface 2 is a non-guaranteed surface and the second main surface 3 is a guaranteed surface.
  • the guaranteed surface is the surface on which elements, etc. are formed in the glass plate finally obtained from the glass ribbon GR, and the surface properties are guaranteed, whereas the non-guaranteed surface is This is a surface whose surface properties do not need to be guaranteed to the extent of a surface.
  • ear portions each having a thickness larger than the widthwise central portion are formed.
  • the thickness of the central portion in the width direction of the glass ribbon GR is 1000 ⁇ m or less, preferably 700 ⁇ m or less, and the lower limit thereof is, for example, 50 ⁇ m or more.
  • the first cutting step S2 is a step of cutting out the first glass plate G1 by scribe cutting along the width direction X from the glass ribbon GR formed in the forming step S1.
  • the first cutting step S2 includes a scribing step of forming a scribe line SL1 on the glass ribbon GR with a scribe tool, and a breaking step of applying bending stress to the glass ribbon GR with the scribe line SL1 formed thereon and breaking it. .
  • the scribe wheel 4 as a scribe tool is pressed against the surface of the glass ribbon GR and moves from the position shown by the chain line to the position shown by the solid line, thereby forming a scribe wheel 4 on the first principal surface 2 of the glass ribbon GR in the width direction X.
  • a scribe line SL1 is formed along the line.
  • the region where the scribe line SL1 is formed is supported by a support member (not shown) from the second main surface 3 side.
  • a gripping mechanism 5 is disposed below the scribing wheel 4 and the support member, but the gripping mechanism 5 is not operated during the scribing process.
  • the scribe wheel 4 and the support member are retracted to the retracted position.
  • the scribe line SL1 does not reach both ends of the glass ribbon GR in the width direction, but it may reach both ends.
  • the grasping mechanism 5 that grasps the lower end of the glass ribbon GR is rotated in the direction of the arrow a with the folding member 6 supporting the region where the scribe line SL1 is formed from the second main surface 3 side.
  • the scribe line SL1 is formed from the second main surface 3 side.
  • the first glass plate G1 is transported by the transport device 7 to a position where the second cutting step S3 can be performed (transport step).
  • the transport device 7 is configured to transport the first glass plate G1 while holding it in a vertical position.
  • the conveyance device 7 has a holding part 7a that holds the upper part of the first glass plate G1.
  • the holding portion 7a is configured, for example, by a chuck that grips the first glass plate G1, but is not limited thereto, and may be configured by a holding means such as a suction pad.
  • the holding portion 7a is configured to be movable in a predetermined direction using a guide rail or the like.
  • the holding part 7a holds only the upper part of the first glass plate G1 and conveys the first glass plate G1 in a vertical position in a suspended state.
  • the second cutting step S3 is a step of cutting the width direction end portion Ga of the first glass plate G1. That is, in the second cutting step S3, while the first glass plate G1 is supported in a vertical position by the conveying device 7, both ends Ga in the width direction are removed by scribe cutting along the vertical direction, and the second glass plate G2 is removed. Cut out.
  • the second cutting step S3 includes a scribing step of forming a scribe line SL2 including a median crack MC on the first glass plate G1 using a scribe tool, and applying bending stress to the first glass plate G1 on which the scribe line SL2 has been formed.
  • a folding step of folding and splitting is included.
  • a part of the second main surface 3 of the first glass plate G1 is supported by two support members (not shown).
  • the two scribe wheels 8 as scribe tools form scribe lines SL2 at predetermined positions (positions slightly inside in the width direction from the ears) on both ends Ga in the width direction of the first glass plate G1. .
  • the two scribe wheels 8 move from the position shown by the chain line to the position shown by the solid line while respectively pressing predetermined positions on both widthwise ends Ga of the first main surface 2 of the first glass plate G1. Thereby, two scribe lines SL2 are formed along the first main surface 2 of the first glass plate G1 in the vertical direction.
  • the scribe line SL2 is configured in a straight line along the vertical direction so as to correspond to the board drawing direction Y.
  • the scribe line SL2 has a starting end SL2a and a terminal end SL2b.
  • the starting end SL2a of the scribe line SL2 is located below the upper end of the first glass plate G1, but the starting end of the scribe line SL2 is located at the upper end of the first glass plate G1.
  • SL2a may be set.
  • the distance from the upper end surface of the first glass plate G1 to the starting end SL2a of the scribe line SL2 is, for example, 10 mm to 300 mm.
  • the terminal end SL2b of the scribe line SL2 is located above the lower end of the first glass plate G1, the terminal end SL2b of the scribe line SL2 may be set at the lower end of the first glass plate G1. Good too.
  • the distance from the lower end surface of the first glass plate G1 to the terminal end SL2a of the scribe line SL2 is, for example, 10 mm to 300 mm.
  • the two scribe lines SL2 may be formed simultaneously or separately over time.
  • the starting end SL2a and the terminal end SL2b of the scribe line SL2 may be vertically reversed.
  • the upper part of the scribe line SL2 starts from the upper end (starting end SL2a) of the scribe line SL2, and ends at a position 25% below the upper end surface of the first glass plate G1, and is indicated by the symbol UP1.
  • the lower part of the scribe line SL2 starts from the lower end of the scribe line SL2 (terminating end SL2b), and ends at a position 25% above the lower end surface of the first glass plate G1, and is indicated by the symbol BP1.
  • a portion between the upper portion UP1 and the lower portion BP1 of the scribe line SL2 is referred to as the intermediate portion of the scribe line SL2, and is indicated by the symbol MP1.
  • the position 25% below the top end surface is defined as the distance A from the top end surface, where A is the length from the top end surface to the bottom end surface of the first glass plate G1 multiplied by 0.25. means a position that is only below. Further, a position 25% above the bottom end surface means a position above the bottom end surface by the above distance A.
  • the scribe line SL2 forms a plastic deformation layer PDL and a median crack MC in the first glass plate G1.
  • the plastically deformed layer PDL is formed by pressing the first main surface 2 of the first glass plate G1 with the scribe wheel 8.
  • the median crack MC is formed by integrally forming a first crack MCa called a rib mark and a second crack MCb formed at a deeper position than the first crack MCa.
  • the combined depth (D1+D2) of the depth D1 of the first crack MCa and the depth D1 of the second crack MCb is referred to as the "median crack depth.”
  • the scribe line SL2 is formed along the longitudinal direction (sheet drawing direction Y). Median cracks MC are formed with different depths.
  • the first glass plate G1 is supported by two support members 9 on the second main surface 3 side, and the first glass plate G1 is cut along two scribe lines SL2. Break G1.
  • portions of the first glass plate G1 that are slightly closer to the center in the width direction than the two scribe lines SL2 are supported by the support members 9, respectively.
  • the first glass plate G1 is Break G1.
  • both ends Ga in the width direction including the ears of the first glass plate G1 are removed.
  • a second glass plate G2 having no ears is obtained.
  • the scribe cutting at the two locations may be performed simultaneously or may be performed separately over time.
  • the widthwise dimension of the second glass plate G2 obtained is, for example, 1500 mm or more, preferably 2000 mm or more, and more preferably 3000 mm or more.
  • the upper limit can be, for example, 4000 mm or less.
  • the dimension of the second glass plate G2 in the drawing direction is, for example, 1300 mm or more, preferably 2000 mm or more, and more preferably 2500 mm or more.
  • the upper limit can be, for example, 3600 mm or less.
  • the second glass plate G2 has an upper end surface ESU, a lower end surface ESB, and a pair of side end surfaces ESS newly formed by removing both widthwise ends Ga of the first glass plate G1.
  • the upper end surface ESU and the lower end surface ESB of the second glass plate G2 are elongated surfaces extending along the horizontal direction in the second glass plate G2 in the vertical position.
  • the side end surface ESS of the second glass plate G2 is an elongated folded surface extending along the vertical direction corresponding to the plate drawing direction Y. On this side end surface ESS, scribe marks including the median crack MC formed in the second cutting step S3 remain.
  • a sample of a predetermined size is cut out from the second glass plate G2, and the sample is irradiated with light from a light source (for example, a xenon light) while adjusting the angle of the sample in a dark room.
  • a light source for example, a xenon light
  • By projecting the transmitted light onto a screen it can be observed as a striped pattern. Therefore, even in the state of the second glass plate G2 after the second cutting step S3, the side end surface ESS extending along the sheet drawing direction Y during molding can be specified.
  • a portion of the side end surface ESS that extends up to 25% upward from the lower end surface ESB of the second glass plate G2 is referred to as a lower part (end portion) of the side end surface ESS, and is designated by the symbol BP2.
  • a portion between the upper portion UP2 and the lower portion BP2 of the side end surface ESS is referred to as an intermediate portion of the side end surface ESS, and is designated by the symbol MP2.
  • the depth of the median crack MC of the scribe line SL2 formed on the first glass plate G1 in the second cutting step S3 corresponds to the depth of the median crack of the scribe mark remaining on the side end surface ESS of the second glass plate G2. . Therefore, by measuring the median crack depth (depth from the first principal surface 2) of the scribe marks remaining on the side end surface ESS of the second glass plate G2, the scribe line formed in the second cutting step S3 can be measured.
  • the depth of the median crack MC related to SL2 can be specified. The depth of the median crack is measured, for example, by observing the side end surface ESS of the second glass plate G2 using an electron microscope.
  • the maximum depth of the median crack at the upper, middle, and lower portions is a depth distribution obtained by measuring the depth of the median crack at a pitch of 100 mm along the plate drawing direction. shall be sought from.
  • the depth of the median crack is measured by taking a sample including the side end surface ESS of the second glass plate G2 and using the sample to observe the side end surface ESS with an electron microscope.
  • FIGS. 4 to 7 illustrate a second glass plate G2 formed by scribe lines SL2 with different median cracks MC.
  • the median crack MC of the scribe mark SM remaining on the side end surface ESS of the second glass plate G2 is shown in FIGS. 4 and 6.
  • the upper end SMa of the scribe mark SM corresponds to the starting end SL2a of the scribe line SL2.
  • the lower end SMb of the scribe mark SM corresponds to the terminal end SL2b of the scribe line SL2.
  • the upper part of the scribe mark SM corresponds to the upper part of the scribe line SL2, so the same reference numeral UP1 is used. Since the lower part of the scribe mark SM corresponds to the lower part of the scribe line SL2, the same reference numeral BP1 is used. Since the middle part of the scribe mark SM corresponds to the middle part of the scribe line SL2, the same reference numeral MP1 is used.
  • the upper part UP1 of the scribe mark SM is included in the upper part UP2 of the side end surface ESS of the second glass plate G2.
  • the lower part BP1 of the scribe mark SM is included in the lower part BP2 of the side end surface ESS, and the middle part MP1 of the scribe mark SM is included in the middle part MP2 of the side end face ESS.
  • FIG. 5 is a graph showing the relationship between the position of the scribe line SL2 in the sheet drawing direction Y for forming the second glass plate G2 illustrated in FIG. 4 and the depth of the median crack MC.
  • FIG. 7 is a graph showing the relationship between the position of the scribe line SL2 in the plate drawing direction Y for forming the second glass plate G2 illustrated in FIG. 6 and the depth of the median crack MC.
  • the position of the scribe line SL2 shown in FIGS. 5 and 7 corresponds to the position of the scribe mark SM in the board drawing direction Y on the side end surface ESS of the second glass plate G2.
  • the depth of the median crack MC of the scribe mark SM remaining on the side end surface ESS of the second glass plate G2 of the first embodiment is It is maximum at , and gradually decreases downward from the upper end SMa.
  • the depth of the median crack MC is minimum at the middle part P of the middle part MP2 of the side end surface ESS.
  • the position P where the depth of the median crack MC is minimum is, for example, an intermediate position in the vertical direction of the median crack MC, that is, the distance from the upper end SMa of the scribe mark SM is equal to the distance from the lower end SMb. It is preferable to set the position.
  • the depth of the median crack MC gradually increases downward from the minimum position P.
  • the depth of the median crack MC is maximum at the lower end SMb of the scribe mark SM.
  • the maximum depth of the median crack MC at the middle part MP2 of the side end surface ESS is shallower than the maximum depth of the median crack MC at the lower part BP2 of the side end surface ESS (one end of the side end surface ESS in the board drawing direction Y). . Further, the maximum depth of the median crack MC at the middle part MP2 of the side end surface ESS is shallower than the maximum depth of the median crack MC at the upper part UP2 of the side end surface ESS (the other end of the side end surface ESS in the board drawing direction Y). .
  • the depth of the median crack MC of the scribe line SL2 formed on the first glass plate G1 in the second cutting step S3 is the same at the starting end SL2a and the terminal end SL2b of the scribing line SL2. It is the deepest (D MAX ) and the shallowest (D MIN ) at the middle part P of the middle part MP1.
  • the scribe line SL2 is formed such that the maximum depth of the median crack MC in the middle part MP1 (midway part P) is shallower than the maximum depth of the median crack MC in the lower part BP1. Further, the scribe line SL2 is formed such that the maximum depth of the median crack MC at the intermediate portion MP1 (midway portion P) is shallower than the maximum depth of the median crack MC at the upper portion UP1.
  • the depth of the median crack MC of the scribe mark SM remaining on the side end surface ESS is from the upper end SMa of the scribe mark SM in the upper part UP2 of the side end surface ESS. It gradually increases toward the lower end SMb.
  • the depth of the median crack MC is minimum at the upper end SMa and maximum at the lower end SMb.
  • the maximum depth of the median crack MC in the middle part MP2 of the side end surface ESS is shallower than the maximum depth in the lower part BP2. Moreover, the maximum depth of the median crack MC in the upper part UP2 of the side end surface ESS is shallower than the maximum depth of the median crack MC in the middle part MP2.
  • the depth of the median crack MC of the scribe line SL2 formed on the first glass plate G1 in the second cutting step S3 is shallowest at the starting end SL2a (D MIN It is the deepest (D MAX ) in part SL2b.
  • the depth of the median crack MC in the middle part MP1 (the maximum depth in the middle part MP1 or the depth D in the middle part P ) is different from the depth of the median crack MC in the lower part BP1 (the maximum depth in the middle part MP1 or the depth D P in the middle part P). (minimum depth).
  • the depth of the median crack MC in the upper part UP1 (maximum depth in the upper part UP1) is different from the depth of the median crack MC in the intermediate part MP1 (minimum depth in the intermediate part MP1 or depth in the intermediate part P). It is formed to be shallower than DP ).
  • the maximum depth of the median crack MC in the intermediate portion MP2 of the side end surface ESS can be, for example, 90 ⁇ m or less, and damage can be prevented. From the viewpoint of prevention, it is preferably 80 ⁇ m or less.
  • the minimum depth of the median crack MC in the intermediate portion MP2 is preferably 30 ⁇ m or more, more preferably 50 ⁇ m or more.
  • the maximum depth of the median crack MC in the lower part BP1 of the scribe line SL2 is the maximum depth of the median crack MC in the middle part MP1 of the scribe line SL2.
  • the maximum depth d1 of the median crack MC in the lower part BP1 and the maximum depth d1 in the middle part MP2 are determined from the viewpoint of preventing the occurrence of cutting defects in the lower part of the second glass plate G2 in the second cutting step S3 by making the depth deeper than the maximum depth.
  • the difference (d1-d2) in the maximum depth d2 of the median crack MC is preferably 10 ⁇ m or more, more preferably 20 ⁇ m or more.
  • the upper limit of the difference (d1-d2) can be, for example, 80 ⁇ m or less.
  • the maximum depth of the median crack MC in the upper part UP1 may be the same as the maximum depth of the median crack MC in the middle part MP2. It may be deeper than the maximum depth.
  • the maximum depth of the median crack MC in the upper part UP1 is made shallower than the maximum depth of the median crack MC in the middle part MP1, so that the upper part of the glass plate is held by a holding means such as a chuck. From the viewpoint of preventing breakage of the glass plate when held by It is preferably at least 20 ⁇ m, more preferably at least 20 ⁇ m. On the other hand, the minimum depth of the median crack MC in the upper portion UP1 can be 20 ⁇ m or more.
  • the packing process S4 is a process of manufacturing a glass plate package by loading a plurality of second glass plates G2 on a pallet.
  • the second glass plate G2 is transported to the pallet by the transport device 7 after the second cutting step S3 is completed.
  • the second glass plate G2 cut out in the second cutting process S3 is stacked on the pallet 11 alternately with the protective sheet 10 while being suspended and supported in a vertical position.
  • the protective sheet 10 is a foamed resin sheet, but may also be a non-foamable resin sheet, interleaf paper, or the like.
  • the second glass plate G2 that is about to be loaded onto the pallet 11 is oriented along a vertical plane.
  • the back support surface 12a of the back support portion 12 of the pallet 11 is an inclined surface that slopes rearward as it moves upward.
  • the angle of inclination of the back support surface 12a with respect to the horizontal plane is, for example, 60° to 85°. Therefore, although the glass plate laminate 13 constituted by the second glass plate G2 and the protective sheet 10 loaded on the pallet 11 is in a vertical position, it is inclined to follow the back support surface 12a.
  • the second glass plate G2 is loaded onto the pallet 11 while being suspended and supported in a vertical position by the conveying device 7.
  • the second glass plate G2 is loaded on the pallet 11 so that the second main surface 3 serving as a guarantee surface faces the back support surface 12a of the pallet 11.
  • the glass plate package GPB manufactured by carrying out the packaging process S4 has the rectangular second glass plate G2 and the rectangular protective sheet 10 in a vertical position (strictly speaking, in the above-mentioned inclined position). ) and a pallet 11 on which the glass plate laminates 13 are loaded.
  • the glass plate package GPB also includes packing tools such as a binding band Ba for preventing the glass plate laminate 13 from collapsing. It is preferable that the binding band Ba is provided so as to be located within the range of the intermediate portion MP2 in the side end surface ESS of the second glass plate G2 included in the glass plate laminate 13.
  • the pallet 11 includes a bottom support portion 14 that supports the bottom surface of the glass plate laminate 13 in addition to the back support portion 12 having the inclined back support surface 12a described above.
  • the bottom receiving surface 14a of the bottom support portion 14 is an inclined surface that slopes upward as it moves toward the front side.
  • the maximum depth of the median crack MC in the middle part MP1 of the scribe line SL2 formed on the first glass plate G1 is set to the maximum depth of the median crack MC in the lower part BP1.
  • the depth of the median crack MC of the scribe mark SM in the middle part MP2 of the side end surface ESS of the cut out second glass plate G2 can be made as shallow as possible.
  • the maximum depth of the median crack MC of the scribe mark SM becomes deeper, the intermediate portion MP2 of the side end surface ESS is more likely to be damaged.
  • the maximum depth of the median crack MC of the scribe mark SM in the middle part MP2 of the side end surface ESS of the second glass plate G2 is made shallow to prevent cracking in the middle part MP2 of the side end surface ESS during transportation. This makes it possible to prevent damage to the second glass plate G2 loaded on the pallet 11 in a vertical position.
  • the second glass plate G2 in the second cutting step S3 is It is possible to prevent the occurrence of cutting defects in the lower part.
  • the maximum depth of the median crack MC at the lower part BP1 of the scribe line SL2 is made deeper than the maximum depth of the median crack MC at the middle part MP1 of the scribe line SL2, thereby preventing cutting defects and packaging the glass plate. It becomes possible to prevent damage to the second glass plate G2 in the body GPB.
  • the upper part UP2 of the second glass plate G2 Furthermore, in the glass plate package GPB, by providing a binding band Ba within the range of the intermediate portion MP2 in the side end surface ESS of the second glass plate G2 included in the glass plate laminate 13, the upper part UP2 of the second glass plate G2 also, it is possible to avoid the tightening force exerted by the binding band Ba on the lower part BP2. Thereby, damage to the upper part UP2 or the lower part BP2 of the second glass plate G2 during transportation of the glass plate package GPB can be prevented.
  • the depth of the median crack MC of the scribe mark SM on the broken surface (side end surface ESS) of the second glass plate G2 is measured, but the present invention is not limited to this configuration.
  • the median crack at the scribe line SL2 is determined.
  • the depth of the MC may also be measured.
  • Scribe wheel (scribe tool) 11 Pallet BP1 Lower part of the scribe line BP2 Lower part of the side end surface of the second glass plate ESS Side end face of the second glass plate G1 First glass plate G2 Second glass plate Ga Widthwise end of the first glass plate GPB Glass plate packaging Body MC Median crack MP1 Middle part of the scribe line MP2 Middle part of the side end surface of the second glass plate S3 Second cutting process SL2 Scribe line SM Scribing mark UP1 Upper part of the scribe line UP2 Upper part of the side end face of the second glass plate X Width direction Y board pulling direction

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Abstract

A glass plate manufacturing method according to the present invention includes a cutting step S3 for removing an end section Ga in the width direction of a glass plate G1 in a state in which the glass plate G1 is supported in a vertical position. The cutting step S3 includes a scribing step and a splitting step. In the scribing step, a scribe line SL2 is formed such that the maximum depth of a median crack MC at an intermediate portion MP1 of the scribe line SL2 is less than the maximum depth of a median crack MC at a lower portion BP1 of the scribe line SL2.

Description

ガラス板の製造方法、ガラス板及びガラス板梱包体Glass plate manufacturing method, glass plate and glass plate package
　本発明は、ガラス板の製造方法、ガラス板及びガラス板梱包体に関する。 The present invention relates to a method for manufacturing a glass plate, a glass plate, and a glass plate package.
　周知のように、例えば液晶ディスプレイや有機ＥＬディスプレイなどのディスプレイには、ガラス基板やカバーガラスとしてガラス板が用いられる。ガラス板を製造する方法としては、オーバーフローダウンドロー法、スロットダウンドロー法及びリドロー法に代表されるダウンドロー法を利用した手法が広く採用されている。オーバーフローダウンドロー法を利用したガラス板の製造方法の一例としては、以下に示すようなものが挙げられる。 As is well known, for example, displays such as liquid crystal displays and organic EL displays use glass plates as glass substrates and cover glasses. BACKGROUND ART As a method for manufacturing a glass plate, a method using a down-draw method represented by an overflow down-draw method, a slot down-draw method, and a redraw method is widely adopted. An example of a method for manufacturing a glass plate using the overflow down-draw method is as shown below.
　ガラス板の製造方法では、特許文献１に開示されているように、ガラスリボンを成形する成形工程と、成形されたガラスリボンからスクライブ切断によりガラス板を切り出す第一切断工程（Ｘ切断工程）とを実施する。 As disclosed in Patent Document 1, the method for manufacturing a glass plate includes a forming step of forming a glass ribbon, and a first cutting step (X cutting step) of cutting out a glass plate from the formed glass ribbon by scribe cutting. Implement.
　成形工程では、楔状をなす成形体の頂部に設けたオーバーフロー溝に溶融ガラスを供給して溢れ出させる。溢れ出た溶融ガラスを、それぞれ成形体の側面部に沿って流下させた後、成形体の下端部で融合一体化させる。これにより、板状のガラスリボンを成形する。その後、成形されたガラスリボンは、上下複数段に配置されたローラ対によって表裏両側から挟持された状態で下方に板引きされていく。このようにして得られるガラスリボンの幅方向両端部には、幅方向中央部よりも厚みの大きい耳部がそれぞれ形成される。 In the molding process, molten glass is supplied to an overflow groove provided at the top of the wedge-shaped molded body and is caused to overflow. The overflowing molten glass is allowed to flow down along the side surfaces of the molded body, and then fused and integrated at the lower end of the molded body. Thereby, a plate-shaped glass ribbon is formed. Thereafter, the formed glass ribbon is drawn downward while being held between both front and back sides by pairs of rollers arranged in a plurality of upper and lower stages. At both widthwise end portions of the glass ribbon obtained in this manner, ear portions each having a thickness larger than the widthwise central portion are formed.
　第一切断工程で行われるスクライブ切断は、下方に搬送されてくるガラスリボンの主面に幅方向に沿うスクライブ線を形成し、スクライブ線の周辺領域を湾曲させて曲げ応力を付与してスクライブ線に沿ってガラスリボンを切断するものである。これにより、ガラスリボンから矩形状のガラス板が切り出される。 The scribe cutting performed in the first cutting process forms a scribe line along the width direction on the main surface of the glass ribbon being conveyed downward, and curves the peripheral area of the scribe line to apply bending stress to the scribe line. The glass ribbon is cut along the Thereby, a rectangular glass plate is cut out from the glass ribbon.
　次に、ガラス板の製造方法では、特許文献２に開示されているように、上述のガラス板の幅方向両端部に形成されている耳部をスクライブ切断により除去する第二切断工程（Ｙ切断工程）を実施する。 Next, in the method for manufacturing a glass plate, as disclosed in Patent Document 2, a second cutting step (Y cutting) in which ears formed at both ends of the glass plate in the width direction are removed by scribe cutting process).
　第二切断工程で行われるスクライブ切断は、縦姿勢に保持されているガラス板の幅方向端部側の主面に上下方向に沿うスクライブ線を形成する。その後、スクライブ線の周辺領域を湾曲させて曲げ応力を付与してスクライブ線に沿ってガラスリボンを切断する。このスクライブ切断は、ガラス板の幅方向一端部側及び他端部側についてそれぞれ別々に行われる。この結果、幅方向の両端部に耳部を有しないガラス板が得られる。 The scribe cutting performed in the second cutting step forms a scribe line along the vertical direction on the main surface on the widthwise end side of the glass plate held in the vertical position. Thereafter, the glass ribbon is cut along the scribe line by bending the area around the scribe line to apply bending stress. This scribe cutting is performed separately on one end side and the other end side in the width direction of the glass plate. As a result, a glass plate having no ears at both ends in the width direction is obtained.
　次に、ガラス板の製造方法では、特許文献３に開示されているように、耳部が除去されたガラス板を搬送装置によってパレットに積載し、梱包する工程（梱包工程）を実施する。 Next, in the method for manufacturing a glass plate, as disclosed in Patent Document 3, a step of loading the glass plate from which the ears have been removed onto a pallet using a conveying device and packing it (packing step) is carried out.
　搬送装置は、ガラス板の上部を保持するチャック等からなる保持部を有する。ガラス板は、その上部が保持部によって保持されることで、縦姿勢の宙吊り状態で搬送される。この梱包工程により、複数のガラス板を縦姿勢でパレットに梱包してなるガラス板梱包体が形成される。ガラス板梱包体は、次の工程に移送され、或いは次の工程が実施されるまで保管されることになる。 The conveying device has a holding section made of a chuck or the like that holds the upper part of the glass plate. The glass plate is conveyed in a vertically suspended state by having its upper part held by the holding section. Through this packing process, a glass plate package is formed by packing a plurality of glass plates in a vertical position on a pallet. The glass plate package is transferred to the next process or stored until the next process is performed.
特開２０１７－２０２９５８号公報JP2017-202958A 特開２０１７－２２６５４９号公報Japanese Patent Application Publication No. 2017-226549 特開２０２０－７５７５２号公報Japanese Patent Application Publication No. 2020-75752
　上記のような従来のガラスフィルムの製造方法では、ガラス板梱包体に梱包されるガラス板は、その幅方向の両端面に、スクライブ線の形成によるスクライブ痕が残存している。 In the conventional glass film manufacturing method as described above, the glass plate packed in the glass plate package has scribe marks left on both end faces in the width direction due to the formation of scribe lines.
　梱包工程において、ガラス板の上部を搬送装置の保持部によって保持した状態では、搬送の際にガラス板に揺れが生じ、これによってガラス板に曲げ応力が作用する。このため、従来のガラス板の製造方法では、搬送時に作用するこの曲げ応力によって、ガラス板の幅方向の両端面に残存するスクライブ痕から割れが生じるおそれがあった。 In the packaging process, when the upper part of the glass plate is held by the holding section of the transport device, the glass plate shakes during transport, which causes bending stress to act on the glass plate. For this reason, in the conventional glass plate manufacturing method, cracks may occur from the scribe marks remaining on both end faces in the width direction of the glass plate due to this bending stress that acts during transportation.
　本発明は上記の事情に鑑みてなされたものであり、パレットに縦姿勢で積載されるガラス板の破損を防止することを技術的課題とする。 The present invention has been made in view of the above circumstances, and its technical objective is to prevent damage to glass plates stacked vertically on a pallet.
　本発明は上記の課題を解決するためのものであり、ガラス板を縦姿勢で支持した状態で、前記ガラス板の幅方向の端部を除去する切断工程を備えるガラス板の製造方法であって、前記切断工程は、スクライブツールによって前記ガラス板にメディアンクラックを含むスクライブ線を上下方向に沿って形成するスクライブ工程と、前記スクライブ線が形成された前記ガラス板に曲げ応力を付与して折割る折割り工程と、を含み、前記スクライブ工程では、前記スクライブ線の中間部における前記メディアンクラックの最大深さが、前記スクライブ線の下部における前記メディアンクラックの最大深さよりも浅くなるように前記スクライブ線を形成することを特徴とする。 The present invention is intended to solve the above-mentioned problems, and is a method for manufacturing a glass plate, comprising a cutting step of removing widthwise ends of the glass plate while the glass plate is supported in a vertical position. , the cutting step includes a scribing step of forming a scribe line including a median crack on the glass plate in the vertical direction using a scribe tool, and a bending stress is applied to the glass plate on which the scribe line is formed to break it. In the scribing step, the scribe line is formed such that the maximum depth of the median crack at the middle part of the scribe line is shallower than the maximum depth of the median crack at the lower part of the scribe line. It is characterized by the formation of
　かかる構成によれば、スクライブ線の中間部におけるメディアンクラックの最大深さを浅くすることで、切断工程後のガラス板の幅方向における端面の中間部におけるスクライブ痕のメディアンクラックの最大深さを浅くすることができる。これにより、ガラス板の縦姿勢での搬送中に、ガラス板の揺れによる曲げ応力がガラス板に作用したとしても、ガラス板の端面における中間部に割れが発生することを防ぐことができる。これにより、パレットに縦姿勢で積載されるガラス板の破損を防止することが可能となる。 According to this configuration, by making the maximum depth of the median crack at the middle part of the scribe line shallow, the maximum depth of the median crack of the scribe mark at the middle part of the end face in the width direction of the glass plate after the cutting process is made shallow. can do. Thereby, even if bending stress due to shaking of the glass plate acts on the glass plate while the glass plate is being conveyed in a vertical position, it is possible to prevent cracks from occurring in the intermediate portion of the end face of the glass plate. This makes it possible to prevent damage to the glass plates stacked vertically on the pallet.
　加えて、スクライブ線の下部におけるメディアンクラックの最大深さをスクライブ線の中間部におけるメディアンクラックの最大深さよりも深くすることで、折割り工程において、スクライブ線の下部での切断不良の発生を防止し、ガラス板を精度良く切断することができる。 In addition, by making the maximum depth of the median crack at the bottom of the scribe line deeper than the maximum depth of the median crack at the middle of the scribe line, it is possible to prevent cutting defects at the bottom of the scribe line during the splitting process. The glass plate can be cut with high precision.
　本発明に係るガラス板の製造方法において、前記スクライブ線の前記中間部における前記メディアンクラックの最大深さは、前記スクライブ線の上部における前記メディアンクラックの最大深さよりも浅くてもよい。 In the method for manufacturing a glass plate according to the present invention, the maximum depth of the median crack in the middle part of the scribe line may be shallower than the maximum depth of the median crack in the upper part of the scribe line.
　かかる構成によれば、スクライブ線の上部におけるメディアンクラックの最大深さを中間部におけるメディアンクラックの最大深さよりも深くすることで、折割り工程において、スクライブ線の上部からクラックを下方の中間部及び下部に向かって安定的に進展させることができる。これにより、切断工程における切断不良の発生を防止することが可能となる。また、ガラス板が反りを有している場合であっても、切断不良を発生させることなくガラス板を折割ることが可能となる。 According to this configuration, by making the maximum depth of the median crack at the upper part of the scribe line deeper than the maximum depth of the median crack at the intermediate part, the crack is spread from the upper part of the scribe line to the lower intermediate part and the lower part in the breaking process. It can be stably developed toward the bottom. This makes it possible to prevent cutting defects from occurring during the cutting process. Furthermore, even if the glass plate is warped, it is possible to break the glass plate without causing cutting defects.
　本発明に係るガラス板の製造方法において、前記スクライブ線の上部における前記メディアンクラックの最大深さは、前記スクライブ線の前記中間部における前記メディアンクラックの最大深さよりも浅くてもよい。 In the method for manufacturing a glass plate according to the present invention, the maximum depth of the median crack at the upper part of the scribe line may be shallower than the maximum depth of the median crack at the intermediate part of the scribe line.
　かかる構成によれば、スクライブ線の上部におけるメディアンクラックの最大深さを浅くすることで、折割り工程によって形成されるガラス板の幅方向における端面の上部に残存するスクライブ痕のメディアンクラックの最大深さを浅くすることができる。これにより、ガラス板梱包体を製造するにあたり、ガラス板の上部をチャック等の保持手段によって保持した場合であっても、搬送時の衝撃等によるガラス板の上部の破損を防止することができる。 According to this configuration, by making the maximum depth of the median crack at the top of the scribe line shallow, the maximum depth of the median crack of the scribe mark remaining at the top of the end face in the width direction of the glass plate formed by the breaking process is reduced. You can make it shallower. Thereby, even when the upper part of the glass plate is held by a holding means such as a chuck when manufacturing the glass plate package, it is possible to prevent the upper part of the glass plate from being damaged due to impact during transportation or the like.
　本発明は上記の課題を解決するためのものであり、矩形状のガラス板と、前記ガラス板が縦姿勢で積層されるパレットとを備えるガラス板梱包体であって、前記ガラス板は、幅方向の端部に、上下方向に延びる端面を有しており、前記端面は、メディアンクラックを含むスクライブ痕を有する折割面であり、前記端面の中間部における前記メディアンクラックの最大深さは、前記端面の下部における前記メディアンクラックの最大深さよりも浅いことを特徴とする。 The present invention is intended to solve the above problems, and is a glass plate package comprising rectangular glass plates and a pallet on which the glass plates are stacked in a vertical position, the glass plates having a width It has an end face extending in the vertical direction at the end of the direction, the end face is a folding surface having a scribe mark including a median crack, and the maximum depth of the median crack in the middle part of the end face is: It is characterized in that the depth is shallower than the maximum depth of the median crack at the lower part of the end face.
　かかる構成によれば、ガラス板において上下方向に延びる端面の中間部におけるスクライブ痕のメディアンクラックの最大深さを浅くすることで、ガラス板の縦姿勢での搬送中に、ガラス板の揺れによる曲げ応力がガラス板に作用したとしても、ガラス板の端面における中間部に割れが発生することを防ぐことができる。これにより、パレットに縦姿勢で積載されるガラス板の破損を防止することが可能となる。 According to this configuration, by reducing the maximum depth of the median crack of the scribe mark in the middle part of the end face extending in the vertical direction of the glass plate, bending due to shaking of the glass plate while the glass plate is conveyed in a vertical position is reduced. Even if stress acts on the glass plate, it is possible to prevent cracks from occurring in the middle portion of the end face of the glass plate. This makes it possible to prevent damage to the glass plates stacked vertically on the pallet.
　本発明に係るガラス板梱包体において、前記端面の前記中間部における前記メディアンクラックの最大深さは、前記端面の前記上部における前記メディアンクラックの最大深さよりも浅くてもよい。 In the glass plate package according to the present invention, the maximum depth of the median crack at the intermediate portion of the end face may be shallower than the maximum depth of the median crack at the upper part of the end face.
　かかる構成によれば、ガラス板を縦姿勢で搬送する際に、ガラス板の幅方向の端面における中間部にガラス板の揺れによる曲げ応力が作用した場合であっても、中間部の割れの発生をより効果的に防止できる。 According to this configuration, even if bending stress due to shaking of the glass plate is applied to the middle part of the end face in the width direction of the glass plate when the glass plate is conveyed in a vertical position, cracks in the middle part will not occur. can be more effectively prevented.
　本発明に係るガラス板梱包体において、前記端面の前記上部における前記メディアンクラックの最大深さは、前記端面の前記中間部における前記メディアンクラックの最大深さよりも浅くてもよい。 In the glass plate package according to the present invention, the maximum depth of the median crack at the upper part of the end face may be shallower than the maximum depth of the median crack at the middle part of the end face.
　かかる構成によれば、ガラス板梱包体を製造するにあたり、ガラス板の上部をチャック等の保持手段によって保持した場合であっても、搬送時の衝撃等によるガラス板の上部の破損を防止することができる。 According to this configuration, when manufacturing a glass plate package, even if the upper part of the glass plate is held by a holding means such as a chuck, it is possible to prevent the upper part of the glass plate from being damaged due to impact etc. during transportation. I can do it.
　本発明は上記の課題を解決するためのものであり、矩形状のガラス板であって、板引き方向に延びる端面を有し、前記端面は、メディアンクラックを含むスクライブ痕を有する折割面であり、前記端面の板引き方向における中間部における前記メディアンクラックの最大深さは、前記端面の前記板引き方向における一方の端部における前記メディアンクラックの最大深さよりも浅いことを特徴とする。 The present invention is intended to solve the above-mentioned problems, and is a rectangular glass plate having an end face extending in the sheet drawing direction, the end face being a breaking surface having a scribe mark including a median crack. The maximum depth of the median crack at an intermediate portion of the end face in the board drawing direction is shallower than the maximum depth of the median crack at one end of the end face in the board drawing direction.
　かかる構成によれば、ガラス板を縦姿勢で搬送する際に、ガラス板の揺れによって端面の中間部に曲げ応力が作用した場合であっても、この中間部に割れが発生することを防止できる。これにより、パレットに縦姿勢で積載されるガラス板の破損を防止することが可能となる。 According to this configuration, even if bending stress is applied to the middle part of the end face due to shaking of the glass plate when the glass plate is transported in a vertical position, it is possible to prevent cracks from occurring in this middle part. . This makes it possible to prevent damage to the glass plates stacked vertically on the pallet.
　本発明によれば、パレットに縦姿勢で積載されるガラス板の破損を防止することができる。 According to the present invention, it is possible to prevent damage to glass plates loaded vertically on a pallet.
ガラス板の製造方法を示すフローチャートである。It is a flowchart which shows the manufacturing method of a glass plate. ガラス板の製造方法の一部を示す斜視図である。It is a perspective view showing a part of manufacturing method of a glass plate. ガラス板の製造方法における第二切断工程を示す側面図である。It is a side view which shows the second cutting process in the manufacturing method of a glass plate. ガラス板の一例を示す斜視図である。It is a perspective view showing an example of a glass plate. 図４のガラス板に関するスクライブ線の位置と、メディアンクラックの深さとの関係を示すグラフである。5 is a graph showing the relationship between the position of the scribe line and the depth of the median crack regarding the glass plate of FIG. 4. FIG. ガラス板の他の例を示す斜視図である。It is a perspective view showing other examples of a glass plate. 図６のガラス板に関するスクライブ線の位置と、メディアンクラックの深さとの関係を示すグラフである。7 is a graph showing the relationship between the position of the scribe line and the depth of the median crack regarding the glass plate of FIG. 6. FIG. ガラス板の製造方法における梱包工程を示す斜視図である。It is a perspective view showing a packing process in a manufacturing method of a glass plate. ガラス板梱包体の斜視図である。It is a perspective view of a glass plate package.
　以下、本発明を実施するための形態について、図面を参照しながら説明する。図１乃至図９は、本発明に係るガラス板及びその製造方法並びにガラス板梱包体の一実施形態を示す。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. 1 to 9 show an embodiment of a glass plate, a method for manufacturing the same, and a glass plate package according to the present invention.
　図１に示すように、本発明に係るガラス板の製造方法は、成形工程Ｓ１と、第一切断工程Ｓ２と、第二切断工程Ｓ３と、梱包工程Ｓ４と、を主に備える。 As shown in FIG. 1, the method for manufacturing a glass plate according to the present invention mainly includes a forming step S1, a first cutting step S2, a second cutting step S3, and a packing step S4.
　成形工程Ｓ１は、溶融ガラスＧＭからガラスリボンＧＲを成形する工程である。図２に示すように、成形工程Ｓ１では、楔状をなす成形体１の頂部のオーバーフロー溝１ａに溶融ガラスＧＭを供給して溢れ出させる。溢れ出た溶融ガラスＧＭを、それぞれ成形体１の側面部に沿って流下させた後、成形体１の下端部で融合一体化させる。 The molding step S1 is a step of molding the glass ribbon GR from the molten glass GM. As shown in FIG. 2, in the molding step S1, molten glass GM is supplied to the overflow groove 1a at the top of the wedge-shaped molded body 1 and is caused to overflow. The overflowing molten glass GM is allowed to flow down along the side surfaces of the molded body 1, and then fused and integrated at the lower end of the molded body 1.
　これにより、板状のガラスリボンＧＲを成形する。その後、成形されたガラスリボンＧＲは、上下複数段に配置されたローラ対（図示略）によって表裏両側から挟持された状態で下方に板引きされていく。上下複数段に配置されたローラ対の最上段には、冷却ローラ対が配置される。本実施形態では、成形工程Ｓ１における板引き方向Ｙは、上下方向に沿うように設定されている。 Thereby, a plate-shaped glass ribbon GR is formed. Thereafter, the formed glass ribbon GR is drawn downward while being held between both front and back sides by pairs of rollers (not shown) arranged in a plurality of upper and lower stages. A cooling roller pair is arranged at the top of the roller pairs arranged in a plurality of upper and lower stages. In this embodiment, the board drawing direction Y in the forming process S1 is set along the up-down direction.
　成形されたガラスリボンＧＲは、第一主面２と、第二主面３とを有する。本実施形態では、第一主面２が非保証面、第二主面３が保証面とされたガラスリボンＧＲを例示する。ここで、保証面は、ガラスリボンＧＲから最終的に得られるガラス板における素子等が形成される面であって、その面性状が保証される面であるのに対し、非保証面は、保証面の程度まで面性状が保証されなくともよい面である。 The molded glass ribbon GR has a first main surface 2 and a second main surface 3. In this embodiment, a glass ribbon GR is illustrated in which the first main surface 2 is a non-guaranteed surface and the second main surface 3 is a guaranteed surface. Here, the guaranteed surface is the surface on which elements, etc. are formed in the glass plate finally obtained from the glass ribbon GR, and the surface properties are guaranteed, whereas the non-guaranteed surface is This is a surface whose surface properties do not need to be guaranteed to the extent of a surface.
　ガラスリボンＧＲの幅方向両端部Ｇａには、幅方向中央部よりも厚みの大きい耳部がそれぞれ形成されている。ガラスリボンＧＲの幅方向中央部の厚みは、１０００μｍ以下、好ましくは７００μｍ以下であり、その下限値は例えば５０μｍ以上である。 At both widthwise end portions Ga of the glass ribbon GR, ear portions each having a thickness larger than the widthwise central portion are formed. The thickness of the central portion in the width direction of the glass ribbon GR is 1000 μm or less, preferably 700 μm or less, and the lower limit thereof is, for example, 50 μm or more.
　第一切断工程Ｓ２は、成形工程Ｓ１で成形されたガラスリボンＧＲから幅方向Ｘに沿うスクライブ切断により第一ガラス板Ｇ１を切り出す工程である。第一切断工程Ｓ２は、スクライブツールによってガラスリボンＧＲにスクライブ線ＳＬ１を形成するスクライブ工程と、スクライブ線ＳＬ１が形成されたガラスリボンＧＲに曲げ応力を付与して折割る折割り工程と、を含む。 The first cutting step S2 is a step of cutting out the first glass plate G1 by scribe cutting along the width direction X from the glass ribbon GR formed in the forming step S1. The first cutting step S2 includes a scribing step of forming a scribe line SL1 on the glass ribbon GR with a scribe tool, and a breaking step of applying bending stress to the glass ribbon GR with the scribe line SL1 formed thereon and breaking it. .
　スクライブ工程では、スクライブツールとしてのスクライブホイール４がガラスリボンＧＲの表面に押圧されつつ、鎖線で示す位置から実線で示す位置に移動することで、ガラスリボンＧＲの第一主面２に幅方向Ｘに沿うスクライブ線ＳＬ１を形成する。 In the scribing process, the scribe wheel 4 as a scribe tool is pressed against the surface of the glass ribbon GR and moves from the position shown by the chain line to the position shown by the solid line, thereby forming a scribe wheel 4 on the first principal surface 2 of the glass ribbon GR in the width direction X. A scribe line SL1 is formed along the line.
　このとき、スクライブ線ＳＬ１の形成領域は第二主面３側から支持部材（図示略）により支持されている。スクライブホイール４及び支持部材の下方には、把持機構５が配置されているが、スクライブ工程において把持機構５は作動していない。 At this time, the region where the scribe line SL1 is formed is supported by a support member (not shown) from the second main surface 3 side. A gripping mechanism 5 is disposed below the scribing wheel 4 and the support member, but the gripping mechanism 5 is not operated during the scribing process.
　スクライブ線ＳＬ１が形成された後、スクライブホイール４及び支持部材は退避位置に退避する。なお、図例では、スクライブ線ＳＬ１は、ガラスリボンＧＲの幅方向両端縁に到達していないが、当該両端縁に到達していてもよい。 After the scribe line SL1 is formed, the scribe wheel 4 and the support member are retracted to the retracted position. In the illustrated example, the scribe line SL1 does not reach both ends of the glass ribbon GR in the width direction, but it may reach both ends.
　次いで、折割り工程では、折割部材６がスクライブ線ＳＬ１の形成領域を第二主面３側から支持した状態で、ガラスリボンＧＲの下端部を把持した把持機構５が矢印ａの方向に回動していくことで、スクライブ線ＳＬ１に曲げ応力を付与する。これにより、ガラスリボンＧＲをスクライブ線ＳＬ１に沿って折割ることができる。この折割りによるスクライブ切断によって、幅方向両端部Ｇａに耳部を有する矩形状の第一ガラス板Ｇ１が切り出される。 Next, in the folding step, the grasping mechanism 5 that grasps the lower end of the glass ribbon GR is rotated in the direction of the arrow a with the folding member 6 supporting the region where the scribe line SL1 is formed from the second main surface 3 side. By moving, bending stress is applied to the scribe line SL1. Thereby, the glass ribbon GR can be broken along the scribe line SL1. By this scribe cutting by folding, a rectangular first glass plate G1 having ears at both ends Ga in the width direction is cut out.
　第一ガラス板Ｇ１は、搬送装置７によって第二切断工程Ｓ３を実行可能な位置まで搬送される（搬送工程）。搬送装置７は、第一ガラス板Ｇ１を縦姿勢で保持した状態で搬送するように構成される。搬送装置７は、第一ガラス板Ｇ１の上部を保持する保持部７ａを有する。 The first glass plate G1 is transported by the transport device 7 to a position where the second cutting step S3 can be performed (transport step). The transport device 7 is configured to transport the first glass plate G1 while holding it in a vertical position. The conveyance device 7 has a holding part 7a that holds the upper part of the first glass plate G1.
　保持部７ａは、例えば第一ガラス板Ｇ１を把持するチャックにより構成されるが、これに限らず、吸着パッド等の保持手段により構成されてもよい。保持部７ａは、ガイドレール等によって所定の方向に移動可能に構成される。保持部７ａは、第一ガラス板Ｇ１の上部のみを保持し、縦姿勢の第一ガラス板Ｇ１を宙吊り状態で搬送する。 The holding portion 7a is configured, for example, by a chuck that grips the first glass plate G1, but is not limited thereto, and may be configured by a holding means such as a suction pad. The holding portion 7a is configured to be movable in a predetermined direction using a guide rail or the like. The holding part 7a holds only the upper part of the first glass plate G1 and conveys the first glass plate G1 in a vertical position in a suspended state.
　第二切断工程Ｓ３は、第一ガラス板Ｇ１の幅方向端部Ｇａを切断する工程である。すなわち、第二切断工程Ｓ３では、第一ガラス板Ｇ１を搬送装置７によって縦姿勢で支持した状態で、その幅方向両端部Ｇａをそれぞれ縦方向に沿うスクライブ切断により除去して第二ガラス板Ｇ２を切り出す。 The second cutting step S3 is a step of cutting the width direction end portion Ga of the first glass plate G1. That is, in the second cutting step S3, while the first glass plate G1 is supported in a vertical position by the conveying device 7, both ends Ga in the width direction are removed by scribe cutting along the vertical direction, and the second glass plate G2 is removed. Cut out.
　第二切断工程Ｓ３は、スクライブツールによって第一ガラス板Ｇ１にメディアンクラックＭＣを含むスクライブ線ＳＬ２を形成するスクライブ工程と、スクライブ線ＳＬ２が形成された第一ガラス板Ｇ１に曲げ応力を付与して折割る折割り工程と、を含む。 The second cutting step S3 includes a scribing step of forming a scribe line SL2 including a median crack MC on the first glass plate G1 using a scribe tool, and applying bending stress to the first glass plate G1 on which the scribe line SL2 has been formed. A folding step of folding and splitting is included.
　スクライブ工程では、第一ガラス板Ｇ１の第二主面３の一部を二個の支持部材（図示略）によって支持する。この状態で、スクライブツールとしての二個のスクライブホイール８が第一ガラス板Ｇ１の幅方向両端部Ｇａの所定位置（耳部よりも僅かに幅方向内側の位置）にそれぞれスクライブ線ＳＬ２を形成する。 In the scribing step, a part of the second main surface 3 of the first glass plate G1 is supported by two support members (not shown). In this state, the two scribe wheels 8 as scribe tools form scribe lines SL2 at predetermined positions (positions slightly inside in the width direction from the ears) on both ends Ga in the width direction of the first glass plate G1. .
　二個のスクライブホイール８は、第一ガラス板Ｇ１の第一主面２における幅方向両端部Ｇａの所定位置をそれぞれ押圧しつつ、鎖線で示す位置から実線で示す位置に移動する。これにより、第一ガラス板Ｇ１の第一主面２に縦方向に沿う二本のスクライブ線ＳＬ２が形成される。 The two scribe wheels 8 move from the position shown by the chain line to the position shown by the solid line while respectively pressing predetermined positions on both widthwise ends Ga of the first main surface 2 of the first glass plate G1. Thereby, two scribe lines SL2 are formed along the first main surface 2 of the first glass plate G1 in the vertical direction.
　スクライブ線ＳＬ２は、板引き方向Ｙに対応するように、上下方向に沿う直線状に構成される。スクライブ線ＳＬ２は、始端部ＳＬ２ａと、終端部ＳＬ２ｂとを有する。本実施形態において、スクライブ線ＳＬ２の始端部ＳＬ２ａは、第一ガラス板Ｇ１の上端部よりも下方に位置するが、これに限らず、第一ガラス板Ｇ１の上端部にスクライブ線ＳＬ２の始端部ＳＬ２ａを設定してもよい。第一ガラス板Ｇ１の上端面からスクライブ線ＳＬ２の始端部ＳＬ２ａまでの距離は例えば１０ｍｍ～３００ｍｍである。 The scribe line SL2 is configured in a straight line along the vertical direction so as to correspond to the board drawing direction Y. The scribe line SL2 has a starting end SL2a and a terminal end SL2b. In the present embodiment, the starting end SL2a of the scribe line SL2 is located below the upper end of the first glass plate G1, but the starting end of the scribe line SL2 is located at the upper end of the first glass plate G1. SL2a may be set. The distance from the upper end surface of the first glass plate G1 to the starting end SL2a of the scribe line SL2 is, for example, 10 mm to 300 mm.
　スクライブ線ＳＬ２の終端部ＳＬ２ｂは、第一ガラス板Ｇ１の下端部よりも上方に位置するが、これに限らず、第一ガラス板Ｇ１の下端部にスクライブ線ＳＬ２の終端部ＳＬ２ｂを設定してもよい。第一ガラス板Ｇ１の下端面からスクライブ線ＳＬ２の終端部ＳＬ２ａまでの距離は例えば１０ｍｍ～３００ｍｍである。この場合、二本のスクライブ線ＳＬ２は、同時に形成してもよく、時間経過を経て別々に形成してもよい。また、スクライブ線ＳＬ２の始端部ＳＬ２ａと終端部ＳＬ２ｂは、上下の位置が逆になっていてもよい。 Although the terminal end SL2b of the scribe line SL2 is located above the lower end of the first glass plate G1, the terminal end SL2b of the scribe line SL2 may be set at the lower end of the first glass plate G1. Good too. The distance from the lower end surface of the first glass plate G1 to the terminal end SL2a of the scribe line SL2 is, for example, 10 mm to 300 mm. In this case, the two scribe lines SL2 may be formed simultaneously or separately over time. Further, the starting end SL2a and the terminal end SL2b of the scribe line SL2 may be vertically reversed.
　以下、スクライブ線ＳＬ２の上部は、スクライブ線ＳＬ２の上端部（始端部ＳＬ２ａ）を始点とし、第一ガラス板Ｇ１の上端面から２５％下方にある位置を終点とし、符号ＵＰ１で示す。また、スクライブ線ＳＬ２の下部は、スクライブ線ＳＬ２の下端部（終端部ＳＬ２ｂ）を始点とし、第一ガラス板Ｇ１の下端面から２５％上方にある位置を終点とし、符号ＢＰ１で示す。また、スクライブ線ＳＬ２の上部ＵＰ１と下部ＢＰ１との間の部分を、スクライブ線ＳＬ２の中間部といい、符号ＭＰ１で示す。なお、上端面から２５％下方にある位置とは、第一ガラス板Ｇ１の上端面から下端面までの長さに０．２５を乗じた値を距離Ａとした場合に、上端面から距離Ａだけ下方にある位置を意味する。また、下端面から２５％上方にある位置とは、下端面から上記距離Ａだけ上方にある位置を意味する。 Hereinafter, the upper part of the scribe line SL2 starts from the upper end (starting end SL2a) of the scribe line SL2, and ends at a position 25% below the upper end surface of the first glass plate G1, and is indicated by the symbol UP1. The lower part of the scribe line SL2 starts from the lower end of the scribe line SL2 (terminating end SL2b), and ends at a position 25% above the lower end surface of the first glass plate G1, and is indicated by the symbol BP1. Further, a portion between the upper portion UP1 and the lower portion BP1 of the scribe line SL2 is referred to as the intermediate portion of the scribe line SL2, and is indicated by the symbol MP1. Note that the position 25% below the top end surface is defined as the distance A from the top end surface, where A is the length from the top end surface to the bottom end surface of the first glass plate G1 multiplied by 0.25. means a position that is only below. Further, a position 25% above the bottom end surface means a position above the bottom end surface by the above distance A.
　図３に示すように、スクライブ線ＳＬ２は、第一ガラス板Ｇ１に、塑性変形層ＰＤＬと、メディアンクラックＭＣとを形成する。塑性変形層ＰＤＬは、第一ガラス板Ｇ１の第一主面２がスクライブホイール８で押圧されることにより形成される。メディアンクラックＭＣは、リブマークと呼ばれる第一のクラックＭＣａと、この第一のクラックＭＣａよりも深い位置に形成される第二のクラックＭＣｂとが一体に形成されたものである。本実施形態において、第一のクラックＭＣａの深さＤ１と第二のクラックＭＣｂの深さＤ１とを合わせた深さ（Ｄ１＋Ｄ２）を、「メディアンクラックの深さ」という。 As shown in FIG. 3, the scribe line SL2 forms a plastic deformation layer PDL and a median crack MC in the first glass plate G1. The plastically deformed layer PDL is formed by pressing the first main surface 2 of the first glass plate G1 with the scribe wheel 8. The median crack MC is formed by integrally forming a first crack MCa called a rib mark and a second crack MCb formed at a deeper position than the first crack MCa. In this embodiment, the combined depth (D1+D2) of the depth D1 of the first crack MCa and the depth D1 of the second crack MCb is referred to as the "median crack depth."
　本実施形態に係るスクライブ工程では、第一ガラス板Ｇ１の第一主面２に対するスクライブホイール８の押圧力を調整することにより、スクライブ線ＳＬ２は、その長手方向（板引き方向Ｙ）に沿ってメディアンクラックＭＣの深さが異なるように形成される。 In the scribing process according to the present embodiment, by adjusting the pressing force of the scribe wheel 8 against the first main surface 2 of the first glass plate G1, the scribe line SL2 is formed along the longitudinal direction (sheet drawing direction Y). Median cracks MC are formed with different depths.
　図２に示すように、折割り工程では、第一ガラス板Ｇ１の第二主面３側を二つの支持部材９により支持させた状態で、二本のスクライブ線ＳＬ２に沿って第一ガラス板Ｇ１を折割る。この場合、第一ガラス板Ｇ１の二本のスクライブ線ＳＬ２よりも僅かに幅方向中央側の部位をそれぞれ支持部材９により支持する。この状態で、第一ガラス板Ｇ１の幅方向両端部Ｇａを第一主面２側から押込み部材（図示略）により裏側（第二主面３側）に向かって押し込むことで、第一ガラス板Ｇ１を折割る。 As shown in FIG. 2, in the folding process, the first glass plate G1 is supported by two support members 9 on the second main surface 3 side, and the first glass plate G1 is cut along two scribe lines SL2. Break G1. In this case, portions of the first glass plate G1 that are slightly closer to the center in the width direction than the two scribe lines SL2 are supported by the support members 9, respectively. In this state, by pushing both ends Ga of the first glass plate G1 in the width direction from the first main surface 2 side toward the back side (second main surface 3 side) using a pushing member (not shown), the first glass plate G1 is Break G1.
　この二箇所での折割りによるスクライブ切断によって、第一ガラス板Ｇ１の耳部を含む幅方向両端部Ｇａが除去される。これにより、耳部を有しない第二ガラス板Ｇ２が得られる。この場合、二箇所でのスクライブ切断は、同時に実行してもよく、時間経過を経て別々に行ってもよい。得られる第二ガラス板Ｇ２は、幅方向の寸法が例えば１５００ｍｍ以上であり、２０００ｍｍ以上であることが好ましく、３０００ｍｍ以上であることがより好ましい。一方、上限は例えば４０００ｍｍ以下とすることができる。また、第二ガラス板Ｇ２の板引き方向の寸法は、例えば１３００ｍｍ以上であり、２０００ｍｍ以上であることが好ましく、２５００ｍｍ以上であることがより好ましい。一方、上限は例えば３６００ｍｍ以下とすることができる。 By scribing and cutting at these two locations, both ends Ga in the width direction including the ears of the first glass plate G1 are removed. Thereby, a second glass plate G2 having no ears is obtained. In this case, the scribe cutting at the two locations may be performed simultaneously or may be performed separately over time. The widthwise dimension of the second glass plate G2 obtained is, for example, 1500 mm or more, preferably 2000 mm or more, and more preferably 3000 mm or more. On the other hand, the upper limit can be, for example, 4000 mm or less. Further, the dimension of the second glass plate G2 in the drawing direction is, for example, 1300 mm or more, preferably 2000 mm or more, and more preferably 2500 mm or more. On the other hand, the upper limit can be, for example, 3600 mm or less.
　第二ガラス板Ｇ２は、上端面ＥＳＵと、下端面ＥＳＢと、第一ガラス板Ｇ１の幅方向両端部Ｇａが除去されることによって新たに形成される一対の側端面ＥＳＳと、を有する。第二ガラス板Ｇ２の上端面ＥＳＵ及び下端面ＥＳＢは、縦姿勢の第二ガラス板Ｇ２において水平方向に沿って延びる長尺状の面である。第二ガラス板Ｇ２の側端面ＥＳＳは、板引き方向Ｙに対応する上下方向に沿って延びる長尺状の折割面である。この側端面ＥＳＳには、第二切断工程Ｓ３によって形成されたメディアンクラックＭＣを含むスクライブ痕が残存している。 The second glass plate G2 has an upper end surface ESU, a lower end surface ESB, and a pair of side end surfaces ESS newly formed by removing both widthwise ends Ga of the first glass plate G1. The upper end surface ESU and the lower end surface ESB of the second glass plate G2 are elongated surfaces extending along the horizontal direction in the second glass plate G2 in the vertical position. The side end surface ESS of the second glass plate G2 is an elongated folded surface extending along the vertical direction corresponding to the plate drawing direction Y. On this side end surface ESS, scribe marks including the median crack MC formed in the second cutting step S3 remain.
　なお、第二ガラス板Ｇ２の板引き方向Ｙについては、例えば、第二ガラス板Ｇ２から所定寸法のサンプルを切り出し、暗室でこのサンプルの角度を調整しながら光源（例えばキセノンライト）から光を照射し、その透過光をスクリーンに投影することで、筋状の縞模様として観測できる。したがって、第二切断工程Ｓ３後の第二ガラス板Ｇ２の状態であっても、成形時の板引き方向Ｙに沿って延びる側端面ＥＳＳを特定できる。 Regarding the drawing direction Y of the second glass plate G2, for example, a sample of a predetermined size is cut out from the second glass plate G2, and the sample is irradiated with light from a light source (for example, a xenon light) while adjusting the angle of the sample in a dark room. By projecting the transmitted light onto a screen, it can be observed as a striped pattern. Therefore, even in the state of the second glass plate G2 after the second cutting step S3, the side end surface ESS extending along the sheet drawing direction Y during molding can be specified.
　以下、第二ガラス板Ｇ２の上端面ＥＳＵから下方に２５％（上端面ＥＳＵから下端面ＥＳＢまでの長さの２５％）までの範囲の側端面ＥＳＳの部分を、側端面ＥＳＳの上部（端部）といい、符号ＵＰ２で示す。また、第二ガラス板Ｇ２の下端面ＥＳＢから上方に２５％までの範囲の側端面ＥＳＳの部分を、側端面ＥＳＳの下部（端部）といい、符号ＢＰ２で示す。また、側端面ＥＳＳの上部ＵＰ２と下部ＢＰ２との間の部分を、側端面ＥＳＳの中間部といい、符号ＭＰ２で示す。 Hereinafter, a portion of the side end surface ESS in a range of 25% downward from the upper end surface ESU of the second glass plate G2 (25% of the length from the upper end surface ESU to the lower end surface ESB) is part) and is indicated by the symbol UP2. Further, a portion of the side end surface ESS that extends up to 25% upward from the lower end surface ESB of the second glass plate G2 is referred to as a lower part (end portion) of the side end surface ESS, and is designated by the symbol BP2. Further, a portion between the upper portion UP2 and the lower portion BP2 of the side end surface ESS is referred to as an intermediate portion of the side end surface ESS, and is designated by the symbol MP2.
　第二切断工程Ｓ３によって第一ガラス板Ｇ１に形成されるスクライブ線ＳＬ２のメディアンクラックＭＣの深さは、第二ガラス板Ｇ２の側端面ＥＳＳに残存するスクライブ痕のメディアンクラックの深さに相当する。したがって、第二ガラス板Ｇ２の側端面ＥＳＳに残存するスクライブ痕のメディアンクラックの深さ（第一主面２からの深さ）を測定することで、第二切断工程Ｓ３によって形成されたスクライブ線ＳＬ２に係るメディアンクラックＭＣの深さを特定できる。メディアンクラックの深さは、例えば電子顕微鏡によって第二ガラス板Ｇ２の側端面ＥＳＳを観察することによって測定される。本発明のガラス板梱包体及びガラス板において上部、中間部及び下部のメディアンクラックの最大深さは、メディアンクラックの深さを板引き方向に沿って１００ｍｍピッチで測定することによって得られる深さ分布から求めるものとする。このメディアンクラックの深さの測定は、第二ガラス板Ｇ２の側端面ＥＳＳを含むサンプルを採取し、そのサンプルを用いて側端面ＥＳＳを電子顕微鏡で観察することによって行うものとする。 The depth of the median crack MC of the scribe line SL2 formed on the first glass plate G1 in the second cutting step S3 corresponds to the depth of the median crack of the scribe mark remaining on the side end surface ESS of the second glass plate G2. . Therefore, by measuring the median crack depth (depth from the first principal surface 2) of the scribe marks remaining on the side end surface ESS of the second glass plate G2, the scribe line formed in the second cutting step S3 can be measured. The depth of the median crack MC related to SL2 can be specified. The depth of the median crack is measured, for example, by observing the side end surface ESS of the second glass plate G2 using an electron microscope. In the glass plate package and glass plate of the present invention, the maximum depth of the median crack at the upper, middle, and lower portions is a depth distribution obtained by measuring the depth of the median crack at a pitch of 100 mm along the plate drawing direction. shall be sought from. The depth of the median crack is measured by taking a sample including the side end surface ESS of the second glass plate G2 and using the sample to observe the side end surface ESS with an electron microscope.
　以下、第二ガラス板Ｇ２の側端面ＥＳＳに残存しているスクライブ痕のメディアンクラックの態様と、スクライブ線ＳＬ２のメディアンクラックＭＣとの関係について、図４乃至図７を参照しながら説明する。 Hereinafter, the relationship between the aspect of the median crack of the scribe marks remaining on the side end surface ESS of the second glass plate G2 and the median crack MC of the scribe line SL2 will be explained with reference to FIGS. 4 to 7.
　図４乃至図７は、メディアンクラックＭＣの態様が異なるスクライブ線ＳＬ２によって形成された第二ガラス板Ｇ２を例示する。これらの例では、図４及び図６において、第二ガラス板Ｇ２の側端面ＥＳＳに残存するスクライブ痕ＳＭのメディアンクラックＭＣを表示している。 FIGS. 4 to 7 illustrate a second glass plate G2 formed by scribe lines SL2 with different median cracks MC. In these examples, the median crack MC of the scribe mark SM remaining on the side end surface ESS of the second glass plate G2 is shown in FIGS. 4 and 6.
　図４及び図６において、スクライブ痕ＳＭの上端部ＳＭａは、スクライブ線ＳＬ２の始端部ＳＬ２ａに相当する。スクライブ痕ＳＭの下端部ＳＭｂは、スクライブ線ＳＬ２の終端部ＳＬ２ｂに相当する。 In FIGS. 4 and 6, the upper end SMa of the scribe mark SM corresponds to the starting end SL2a of the scribe line SL2. The lower end SMb of the scribe mark SM corresponds to the terminal end SL2b of the scribe line SL2.
　スクライブ痕ＳＭの上部は、スクライブ線ＳＬ２の上部に相当するため、同じ符号ＵＰ１を用いる。スクライブ痕ＳＭの下部は、スクライブ線ＳＬ２の下部に相当するため、同じ符号ＢＰ１を用いる。スクライブ痕ＳＭの中間部は、スクライブ線ＳＬ２の中間部に相当するため、同じ符号ＭＰ１を用いる。スクライブ痕ＳＭの上部ＵＰ１は、第二ガラス板Ｇ２の側端面ＥＳＳの上部ＵＰ２に含まれる。スクライブ痕ＳＭの下部ＢＰ１は、側端面ＥＳＳの下部ＢＰ２に含まれ、スクライブ痕ＳＭの中間部ＭＰ１は、側端面ＥＳＳの中間部ＭＰ２に含まれる。 The upper part of the scribe mark SM corresponds to the upper part of the scribe line SL2, so the same reference numeral UP1 is used. Since the lower part of the scribe mark SM corresponds to the lower part of the scribe line SL2, the same reference numeral BP1 is used. Since the middle part of the scribe mark SM corresponds to the middle part of the scribe line SL2, the same reference numeral MP1 is used. The upper part UP1 of the scribe mark SM is included in the upper part UP2 of the side end surface ESS of the second glass plate G2. The lower part BP1 of the scribe mark SM is included in the lower part BP2 of the side end surface ESS, and the middle part MP1 of the scribe mark SM is included in the middle part MP2 of the side end face ESS.
　図５は、図４に例示する第二ガラス板Ｇ２を形成するためのスクライブ線ＳＬ２の板引き方向Ｙにおける位置と、メディアンクラックＭＣの深さとの関係を示すグラフである。図７は、図６に例示する第二ガラス板Ｇ２を形成するためのスクライブ線ＳＬ２の板引き方向Ｙにおける位置とメディアンクラックＭＣの深さとの関係を示すグラフである。図５及び図７に示すスクライブ線ＳＬ２の位置は、第二ガラス板Ｇ２における側端面ＥＳＳの板引き方向Ｙにおけるスクライブ痕ＳＭの位置に相当する。 FIG. 5 is a graph showing the relationship between the position of the scribe line SL2 in the sheet drawing direction Y for forming the second glass plate G2 illustrated in FIG. 4 and the depth of the median crack MC. FIG. 7 is a graph showing the relationship between the position of the scribe line SL2 in the plate drawing direction Y for forming the second glass plate G2 illustrated in FIG. 6 and the depth of the median crack MC. The position of the scribe line SL2 shown in FIGS. 5 and 7 corresponds to the position of the scribe mark SM in the board drawing direction Y on the side end surface ESS of the second glass plate G2.
　図４に示すように、第１実施形態の第二ガラス板Ｇ２の側端面ＥＳＳに残存するスクライブ痕ＳＭのメディアンクラックＭＣの深さ（第一主面２からの深さ）は、上端部ＳＭａにおいて最大であり、上端部ＳＭａから下方に向かうにつれて徐々に減少している。メディアンクラックＭＣの深さは、側端面ＥＳＳの中間部ＭＰ２の中途部Ｐにおいて最小となる。メディアンクラックＭＣの深さが最小となる位置Ｐは、例えば、メディアンクラックＭＣの上下方向における中間の位置、すなわち、スクライブ痕ＳＭの上端部ＳＭａからの距離と下端部ＳＭｂからの距離とが等しくなる位置に設定されることが好ましい。さらに、メディアンクラックＭＣの深さは、この最小となった位置Ｐから下方に向かうにつれて徐々に増加している。メディアンクラックＭＣの深さは、スクライブ痕ＳＭの下端部ＳＭｂにおいて最大となる。 As shown in FIG. 4, the depth of the median crack MC of the scribe mark SM remaining on the side end surface ESS of the second glass plate G2 of the first embodiment (depth from the first main surface 2) is It is maximum at , and gradually decreases downward from the upper end SMa. The depth of the median crack MC is minimum at the middle part P of the middle part MP2 of the side end surface ESS. The position P where the depth of the median crack MC is minimum is, for example, an intermediate position in the vertical direction of the median crack MC, that is, the distance from the upper end SMa of the scribe mark SM is equal to the distance from the lower end SMb. It is preferable to set the position. Furthermore, the depth of the median crack MC gradually increases downward from the minimum position P. The depth of the median crack MC is maximum at the lower end SMb of the scribe mark SM.
　したがって、側端面ＥＳＳの中間部ＭＰ２におけるメディアンクラックＭＣの最大深さは、側端面ＥＳＳの下部ＢＰ２（板引き方向Ｙにおける側端面ＥＳＳの一方の端部）におけるメディアンクラックＭＣの最大深さよりも浅い。また、側端面ＥＳＳの中間部ＭＰ２におけるメディアンクラックＭＣの最大深さは、側端面ＥＳＳの上部ＵＰ２（板引き方向Ｙにおける側端面ＥＳＳの他方の端部）におけるメディアンクラックＭＣの最大深さよりも浅い。 Therefore, the maximum depth of the median crack MC at the middle part MP2 of the side end surface ESS is shallower than the maximum depth of the median crack MC at the lower part BP2 of the side end surface ESS (one end of the side end surface ESS in the board drawing direction Y). . Further, the maximum depth of the median crack MC at the middle part MP2 of the side end surface ESS is shallower than the maximum depth of the median crack MC at the upper part UP2 of the side end surface ESS (the other end of the side end surface ESS in the board drawing direction Y). .
　換言すると、図５に示すように、第二切断工程Ｓ３において第一ガラス板Ｇ１に形成されるスクライブ線ＳＬ２のメディアンクラックＭＣの深さは、スクライブ線ＳＬ２の始端部ＳＬ２ａと終端部ＳＬ２ｂとにおいて最も深く（ＤMAX）、中間部ＭＰ１の中途部Ｐで最も浅い（ＤMIN）。 In other words, as shown in FIG. 5, the depth of the median crack MC of the scribe line SL2 formed on the first glass plate G1 in the second cutting step S3 is the same at the starting end SL2a and the terminal end SL2b of the scribing line SL2. It is the deepest (D MAX ) and the shallowest (D MIN ) at the middle part P of the middle part MP1.
　すなわち、スクライブ線ＳＬ２は、その中間部ＭＰ１（中途部Ｐ）におけるメディアンクラックＭＣの最大深さが、その下部ＢＰ１におけるメディアンクラックＭＣの最大深さよりも浅くなるように形成される。また、スクライブ線ＳＬ２は、その中間部ＭＰ１（中途部Ｐ）におけるメディアンクラックＭＣの最大深さが、その上部ＵＰ１におけるメディアンクラックＭＣの最大深さよりも浅くなるように形成される。 That is, the scribe line SL2 is formed such that the maximum depth of the median crack MC in the middle part MP1 (midway part P) is shallower than the maximum depth of the median crack MC in the lower part BP1. Further, the scribe line SL2 is formed such that the maximum depth of the median crack MC at the intermediate portion MP1 (midway portion P) is shallower than the maximum depth of the median crack MC at the upper portion UP1.
　図６に示す第２実施形態の第二ガラス板Ｇ２では、側端面ＥＳＳに残存するスクライブ痕ＳＭのメディアンクラックＭＣの深さは、側端面ＥＳＳの上部ＵＰ２にあるスクライブ痕ＳＭの上端部ＳＭａから下端部ＳＭｂに向かうにつれて徐々に増加している。メディアンクラックＭＣの深さは、上端部ＳＭａにおいて最小となり、下端部ＳＭｂにおいて最大となる。 In the second glass plate G2 of the second embodiment shown in FIG. 6, the depth of the median crack MC of the scribe mark SM remaining on the side end surface ESS is from the upper end SMa of the scribe mark SM in the upper part UP2 of the side end surface ESS. It gradually increases toward the lower end SMb. The depth of the median crack MC is minimum at the upper end SMa and maximum at the lower end SMb.
　したがって、側端面ＥＳＳの中間部ＭＰ２におけるメディアンクラックＭＣの最大深さは、下部ＢＰ２における最大深さよりも浅くなっている。また、側端面ＥＳＳの上部ＵＰ２におけるメディアンクラックＭＣの最大深さは、中間部ＭＰ２におけるメディアンクラックＭＣの最大深さよりも浅くなっている。 Therefore, the maximum depth of the median crack MC in the middle part MP2 of the side end surface ESS is shallower than the maximum depth in the lower part BP2. Moreover, the maximum depth of the median crack MC in the upper part UP2 of the side end surface ESS is shallower than the maximum depth of the median crack MC in the middle part MP2.
　詳述すると、図７に示すように、第二切断工程Ｓ３において第一ガラス板Ｇ１に形成されるスクライブ線ＳＬ２のメディアンクラックＭＣの深さは、始端部ＳＬ２ａで最も浅く（ＤMIN）、終端部ＳＬ２ｂで最も深い（ＤMAX）。また、スクライブ線ＳＬ２は、中間部ＭＰ１におけるメディアンクラックＭＣの深さ（中間部ＭＰ１における最大深さ又は中途部Ｐにおける深さＤP）が、下部ＢＰ１におけるメディアンクラックＭＣの深さ（下部ＢＰ１における最小深さ）よりも浅くなるように形成される。また、スクライブ線ＳＬ２は、上部ＵＰ１におけるメディアンクラックＭＣの深さ（上部ＵＰ１における最大深さ）が、中間部ＭＰ１におけるメディアンクラックＭＣの深さ（中間部ＭＰ１における最小深さ又は中途部Ｐにおける深さＤP）よりも浅くなるように形成される。 Specifically, as shown in FIG. 7, the depth of the median crack MC of the scribe line SL2 formed on the first glass plate G1 in the second cutting step S3 is shallowest at the starting end SL2a (D MIN It is the deepest (D MAX ) in part SL2b. Further, in the scribe line SL2, the depth of the median crack MC in the middle part MP1 (the maximum depth in the middle part MP1 or the depth D in the middle part P ) is different from the depth of the median crack MC in the lower part BP1 (the maximum depth in the middle part MP1 or the depth D P in the middle part P). (minimum depth). Further, in the scribe line SL2, the depth of the median crack MC in the upper part UP1 (maximum depth in the upper part UP1) is different from the depth of the median crack MC in the intermediate part MP1 (minimum depth in the intermediate part MP1 or depth in the intermediate part P). It is formed to be shallower than DP ).
　第１及び第２実施形態の第二ガラス板Ｇ２では、厚みが２００μｍ以上である場合、側端面ＥＳＳの中間部ＭＰ２におけるメディアンクラックＭＣの最大深さは例えば９０μｍ以下とすることができ、破損を防止する観点から、８０μｍ以下であることが好ましい。一方、折り割りを安定させる観点から、中間部ＭＰ２におけるメディアンクラックＭＣの最小深さは３０μｍ以上であることが好ましく、５０μｍ以上であることがより好ましい。 In the second glass plate G2 of the first and second embodiments, when the thickness is 200 μm or more, the maximum depth of the median crack MC in the intermediate portion MP2 of the side end surface ESS can be, for example, 90 μm or less, and damage can be prevented. From the viewpoint of prevention, it is preferably 80 μm or less. On the other hand, from the viewpoint of stabilizing the folding, the minimum depth of the median crack MC in the intermediate portion MP2 is preferably 30 μm or more, more preferably 50 μm or more.
　第１及び第２実施形態の第二ガラス板Ｇ２では、厚みが２００μｍ以上である場合、スクライブ線ＳＬ２の下部ＢＰ１におけるメディアンクラックＭＣの最大深さをスクライブ線ＳＬ２の中間部ＭＰ１におけるメディアンクラックＭＣの最大深さよりも深くすることで、第二切断工程Ｓ３における第二ガラス板Ｇ２の下部の切断不良の発生を防止するする観点から、下部ＢＰ１におけるメディアンクラックＭＣの最大深さｄ１と中間部ＭＰ２におけるメディアンクラックＭＣの最大深さｄ２の差（ｄ１－ｄ２）は１０μｍ以上であることが好ましく、２０μｍ以上であることがより好ましい。一方、差（ｄ１－ｄ２）の上限は例えば８０μｍ以下とすることができる。 In the second glass plate G2 of the first and second embodiments, when the thickness is 200 μm or more, the maximum depth of the median crack MC in the lower part BP1 of the scribe line SL2 is the maximum depth of the median crack MC in the middle part MP1 of the scribe line SL2. The maximum depth d1 of the median crack MC in the lower part BP1 and the maximum depth d1 in the middle part MP2 are determined from the viewpoint of preventing the occurrence of cutting defects in the lower part of the second glass plate G2 in the second cutting step S3 by making the depth deeper than the maximum depth. The difference (d1-d2) in the maximum depth d2 of the median crack MC is preferably 10 μm or more, more preferably 20 μm or more. On the other hand, the upper limit of the difference (d1-d2) can be, for example, 80 μm or less.
　第１実施形態の第二ガラス板Ｇ２では、上部ＵＰ１におけるメディアンクラックＭＣの最大深さは、中間部ＭＰ２におけるメディアンクラックＭＣの最大深さと同じであってもよく、中間部ＭＰ２におけるメディアンクラックＭＣの最大深さよりも深くてもよい。 In the second glass plate G2 of the first embodiment, the maximum depth of the median crack MC in the upper part UP1 may be the same as the maximum depth of the median crack MC in the middle part MP2. It may be deeper than the maximum depth.
　第２実施形態の第二ガラス板Ｇ２では、上部ＵＰ１におけるメディアンクラックＭＣの最大深さを中間部ＭＰ１におけるメディアンクラックＭＣの最大深さよりも浅くすることにより、ガラス板の上部をチャック等の保持手段によって保持した場合にガラス板の破損を防止するする観点から、中間部ＭＰ２におけるメディアンクラックＭＣの最大深さｄ２と上部ＵＰ１におけるメディアンクラックＭＣの最大深さｄ３との差（ｄ２－ｄ３）は１０μｍ以上であることが好ましく、２０μｍ以上であることがより好ましい。一方、上部ＵＰ１におけるメディアンクラックＭＣの最小深さは２０μｍ以上とすることができる。 In the second glass plate G2 of the second embodiment, the maximum depth of the median crack MC in the upper part UP1 is made shallower than the maximum depth of the median crack MC in the middle part MP1, so that the upper part of the glass plate is held by a holding means such as a chuck. From the viewpoint of preventing breakage of the glass plate when held by It is preferably at least 20 μm, more preferably at least 20 μm. On the other hand, the minimum depth of the median crack MC in the upper portion UP1 can be 20 μm or more.
　梱包工程Ｓ４は、複数の第二ガラス板Ｇ２をパレットに積載することで、ガラス板梱包体を製造する工程である。第二ガラス板Ｇ２は、第二切断工程Ｓ３の終了後、搬送装置７によってパレットまで搬送される。 The packing process S4 is a process of manufacturing a glass plate package by loading a plurality of second glass plates G2 on a pallet. The second glass plate G2 is transported to the pallet by the transport device 7 after the second cutting step S3 is completed.
　図８に示すように、梱包工程Ｓ４では、第二切断工程Ｓ３で切り出された第二ガラス板Ｇ２が、縦姿勢で吊り下げ支持された状態で、保護シート１０と交互にパレット１１に積載されていく。保護シート１０は、発泡樹脂シートであるが、発泡性を有しない樹脂シートや合紙などであってもよい。 As shown in FIG. 8, in the packing process S4, the second glass plate G2 cut out in the second cutting process S3 is stacked on the pallet 11 alternately with the protective sheet 10 while being suspended and supported in a vertical position. To go. The protective sheet 10 is a foamed resin sheet, but may also be a non-foamable resin sheet, interleaf paper, or the like.
　パレット１１に積載されようとしている第二ガラス板Ｇ２は、鉛直面に沿う姿勢とされている。これに対して、パレット１１の背面支持部１２の背支持面１２ａは、上側に移行するにつれて後側に傾斜する傾斜面とされている。背支持面１２ａの水平面に対する傾斜角度は、例えば６０°～８５°である。そのため、パレット１１に積載済みの第二ガラス板Ｇ２と保護シート１０とによって構成されるガラス板積層体１３は、縦姿勢ではあるものの、背支持面１２ａに倣って傾斜している。 The second glass plate G2 that is about to be loaded onto the pallet 11 is oriented along a vertical plane. On the other hand, the back support surface 12a of the back support portion 12 of the pallet 11 is an inclined surface that slopes rearward as it moves upward. The angle of inclination of the back support surface 12a with respect to the horizontal plane is, for example, 60° to 85°. Therefore, although the glass plate laminate 13 constituted by the second glass plate G2 and the protective sheet 10 loaded on the pallet 11 is in a vertical position, it is inclined to follow the back support surface 12a.
　第二ガラス板Ｇ２は、搬送装置７によって縦姿勢に吊り下げ支持された状態で、パレット１１に積載される。この場合、第二ガラス板Ｇ２は、保証面としての第二主面３がパレット１１の背支持面１２ａに対向するように、パレット１１に積載される。 The second glass plate G2 is loaded onto the pallet 11 while being suspended and supported in a vertical position by the conveying device 7. In this case, the second glass plate G2 is loaded on the pallet 11 so that the second main surface 3 serving as a guarantee surface faces the back support surface 12a of the pallet 11.
　図９に示すように、梱包工程Ｓ４の実施によって製造されたガラス板梱包体ＧＰＢは、矩形状の第二ガラス板Ｇ２と矩形状の保護シート１０とを縦姿勢（厳密には上記の傾斜姿勢）で交互に積層したガラス板積層体１３と、ガラス板積層体１３が積載されたパレット１１と、を備える。 As shown in FIG. 9, the glass plate package GPB manufactured by carrying out the packaging process S4 has the rectangular second glass plate G2 and the rectangular protective sheet 10 in a vertical position (strictly speaking, in the above-mentioned inclined position). ) and a pallet 11 on which the glass plate laminates 13 are loaded.
　さらに、ガラス板梱包体ＧＰＢは、ガラス板積層体１３の崩れ等を防止する結束バンドＢａなどの梱包具をも備える。結束バンドＢａは、ガラス板積層体１３に含まれる第二ガラス板Ｇ２の側端面ＥＳＳにおける中間部ＭＰ２の範囲内に位置するように設けられることが好ましい。 Furthermore, the glass plate package GPB also includes packing tools such as a binding band Ba for preventing the glass plate laminate 13 from collapsing. It is preferable that the binding band Ba is provided so as to be located within the range of the intermediate portion MP2 in the side end surface ESS of the second glass plate G2 included in the glass plate laminate 13.
　パレット１１は、既述の傾斜した背支持面１２ａを有する背面支持部１２の他、ガラス板積層体１３の底面を支持する底面支持部１４を備える。底面支持部１４の底受け面１４ａは、前側に移行するにつれて上側に傾斜する傾斜面とされている。 The pallet 11 includes a bottom support portion 14 that supports the bottom surface of the glass plate laminate 13 in addition to the back support portion 12 having the inclined back support surface 12a described above. The bottom receiving surface 14a of the bottom support portion 14 is an inclined surface that slopes upward as it moves toward the front side.
　以上説明した本実施形態によれば、第二切断工程Ｓ３において、第一ガラス板Ｇ１に形成するスクライブ線ＳＬ２の中間部ＭＰ１におけるメディアンクラックＭＣの最大深さを、下部ＢＰ１のメディアンクラックＭＣの最大深さよりも浅くすることで、切り出された第二ガラス板Ｇ２の側端面ＥＳＳの中間部ＭＰ２におけるスクライブ痕ＳＭのメディアンクラックＭＣの深さを可及的に浅くすることができる。 According to the present embodiment described above, in the second cutting step S3, the maximum depth of the median crack MC in the middle part MP1 of the scribe line SL2 formed on the first glass plate G1 is set to the maximum depth of the median crack MC in the lower part BP1. By making it shallower than the depth, the depth of the median crack MC of the scribe mark SM in the middle part MP2 of the side end surface ESS of the cut out second glass plate G2 can be made as shallow as possible.
　梱包工程Ｓ４では、搬送装置７によって第二ガラス板Ｇ２を搬送する場合において、第二ガラス板Ｇ２に揺れが生じる。この揺れにより、側端面ＥＳＳの中間部ＭＰ２に曲げ応力が作用し、中間部ＭＰ２に割れが生じるおそれがある。特に、スクライブ痕ＳＭのメディアンクラックＭＣの最大深さが深くなる程、側端面ＥＳＳの中間部ＭＰ２が破損し易い。本実施形態では、第二ガラス板Ｇ２の側端面ＥＳＳの中間部ＭＰ２におけるスクライブ痕ＳＭのメディアンクラックＭＣの最大深さを浅くすることで、搬送時における側端面ＥＳＳの中間部ＭＰ２の割れを防ぐことができる、これにより、パレット１１に縦姿勢で積載される第二ガラス板Ｇ２の破損を防止することが可能となる。 In the packing process S4, when the second glass plate G2 is transported by the transport device 7, shaking occurs in the second glass plate G2. Due to this shaking, bending stress acts on the intermediate portion MP2 of the side end surface ESS, and there is a possibility that cracks may occur in the intermediate portion MP2. In particular, as the maximum depth of the median crack MC of the scribe mark SM becomes deeper, the intermediate portion MP2 of the side end surface ESS is more likely to be damaged. In this embodiment, the maximum depth of the median crack MC of the scribe mark SM in the middle part MP2 of the side end surface ESS of the second glass plate G2 is made shallow to prevent cracking in the middle part MP2 of the side end surface ESS during transportation. This makes it possible to prevent damage to the second glass plate G2 loaded on the pallet 11 in a vertical position.
　さらに、スクライブ線ＳＬ２の下部ＢＰ１におけるメディアンクラックＭＣの最大深さをスクライブ線ＳＬ２の中間部ＭＰ１におけるメディアンクラックＭＣの最大深さよりも深くすることで、第二切断工程Ｓ３における第二ガラス板Ｇ２の下部の切断不良の発生を防止することができる。 Furthermore, by making the maximum depth of the median crack MC at the lower part BP1 of the scribe line SL2 deeper than the maximum depth of the median crack MC at the middle part MP1 of the scribe line SL2, the second glass plate G2 in the second cutting step S3 is It is possible to prevent the occurrence of cutting defects in the lower part.
　すなわち、スクライブ線ＳＬ２の下部ＢＰ１におけるメディアンクラックＭＣの最大深さが浅い場合には、第二切断工程Ｓ３の折割り工程において、曲げ応力の付与によるクラックの進展がこの下部ＢＰ１において不安定になるおそれがある。 That is, if the maximum depth of the median crack MC at the lower part BP1 of the scribe line SL2 is shallow, the crack growth due to the application of bending stress becomes unstable at this lower part BP1 in the breaking process of the second cutting process S3. There is a risk.
　この場合、第二ガラス板Ｇ２の端面の下部ＢＰ２には、幅方向Ｘの外方に突出する突起部や、幅方向Ｘの内方に凹状となる欠けが発生し易くなる。このような切断不良が生じた場合には、パレット１１への積載時やガラス板梱包体ＧＰＢの搬送時に、第二ガラス板Ｇ２の下部が破損し易くなる。本実施形態では、スクライブ線ＳＬ２の下部ＢＰ１におけるメディアンクラックＭＣの最大深さをスクライブ線ＳＬ２の中間部ＭＰ１におけるメディアンクラックＭＣの最大深さよりも深くすることで、切断不良を防止し、ガラス板梱包体ＧＰＢにおける第二ガラス板Ｇ２の破損を防止することが可能となる。 In this case, protrusions that protrude outward in the width direction X and chips that become concave inward in the width direction X are likely to occur in the lower part BP2 of the end surface of the second glass plate G2. If such a cutting defect occurs, the lower part of the second glass plate G2 is likely to be damaged when it is loaded onto the pallet 11 or when the glass plate package GPB is transported. In this embodiment, the maximum depth of the median crack MC at the lower part BP1 of the scribe line SL2 is made deeper than the maximum depth of the median crack MC at the middle part MP1 of the scribe line SL2, thereby preventing cutting defects and packaging the glass plate. It becomes possible to prevent damage to the second glass plate G2 in the body GPB.
　さらに、ガラス板梱包体ＧＰＢにおいて、ガラス板積層体１３に含まれる第二ガラス板Ｇ２の側端面ＥＳＳにおける中間部ＭＰ２の範囲内に結束バンドＢａを設けることで、第二ガラス板Ｇ２の上部ＵＰ２及び下部ＢＰ２に結束バンドＢａによる締め付け力が作用することを回避できる。これにより、ガラス板梱包体ＧＰＢの搬送中における第二ガラス板Ｇ２の上部ＵＰ２又は下部ＢＰ２の破損を防止できる。 Furthermore, in the glass plate package GPB, by providing a binding band Ba within the range of the intermediate portion MP2 in the side end surface ESS of the second glass plate G2 included in the glass plate laminate 13, the upper part UP2 of the second glass plate G2 Also, it is possible to avoid the tightening force exerted by the binding band Ba on the lower part BP2. Thereby, damage to the upper part UP2 or the lower part BP2 of the second glass plate G2 during transportation of the glass plate package GPB can be prevented.
　なお、本発明は、上記実施形態の構成に限定されるものではなく、上記した作用効果に限定されるものでもない。本発明は、本発明の要旨を逸脱しない範囲で種々の変更が可能である。 Note that the present invention is not limited to the configuration of the embodiments described above, nor is it limited to the effects described above. The present invention can be modified in various ways without departing from the gist of the invention.
　上記の実施形態では、第二ガラス板Ｇ２の折割り面（側端面ＥＳＳ）におけるスクライブ痕ＳＭのメディアンクラックＭＣの深さを測定する例を示したが、本発明はこの構成に限定されない。例えば、第二切断工程Ｓ３において、第一ガラス板Ｇ１から切除された幅方向端部Ｇａの折割り面に残存するスクライブ痕のメディアンクラックの深さを測定することにより、スクライブ線ＳＬ２におけるメディアンクラックＭＣの深さを測定してもよい。 In the above embodiment, an example was shown in which the depth of the median crack MC of the scribe mark SM on the broken surface (side end surface ESS) of the second glass plate G2 is measured, but the present invention is not limited to this configuration. For example, in the second cutting step S3, by measuring the depth of the median crack of the scribe mark remaining on the broken surface of the widthwise end portion Ga cut from the first glass plate G1, the median crack at the scribe line SL2 is determined. The depth of the MC may also be measured.
　８　　　　　　スクライブホイール（スクライブツール）
１１　　　　　　パレット
　ＢＰ１　　　　スクライブ線の下部
　ＢＰ２　　　　第二ガラス板の側端面の下部
　ＥＳＳ　　　　第二ガラス板の側端面
　Ｇ１　　　　　第一ガラス板
　Ｇ２　　　　　第二ガラス板
　Ｇａ　　　　　第一ガラス板の幅方向の端部
　ＧＰＢ　　　　ガラス板梱包体
　ＭＣ　　　　　メディアンクラック
　ＭＰ１　　　　スクライブ線の中間部
　ＭＰ２　　　　第二ガラス板の側端面の中間部
　Ｓ３　　　　　第二切断工程
　ＳＬ２　　　　スクライブ線
　ＳＭ　　　　　スクライブ痕
　ＵＰ１　　　　スクライブ線の上部
　ＵＰ２　　　　第二ガラス板の側端面の上部
　Ｘ　　　　　　幅方向
　Ｙ　　　　　　板引き方向 8 Scribe wheel (scribe tool)
11 Pallet BP1 Lower part of the scribe line BP2 Lower part of the side end surface of the second glass plate ESS Side end face of the second glass plate G1 First glass plate G2 Second glass plate Ga Widthwise end of the first glass plate GPB Glass plate packaging Body MC Median crack MP1 Middle part of the scribe line MP2 Middle part of the side end surface of the second glass plate S3 Second cutting process SL2 Scribe line SM Scribing mark UP1 Upper part of the scribe line UP2 Upper part of the side end face of the second glass plate X Width direction Y board pulling direction

Claims (7)

  1. 　ガラス板を縦姿勢で支持した状態で、前記ガラス板の幅方向の端部を除去する切断工程を備えるガラス板の製造方法であって、
    　前記切断工程は、スクライブツールによって前記ガラス板にメディアンクラックを含むスクライブ線を上下方向に沿って形成するスクライブ工程と、前記スクライブ線が形成された前記ガラス板に曲げ応力を付与して折割る折割り工程と、を含み、
    　前記スクライブ工程では、前記スクライブ線の中間部における前記メディアンクラックの最大深さが、前記スクライブ線の下部における前記メディアンクラックの最大深さよりも浅くなるように、前記スクライブ線を形成することを特徴とするガラス板の製造方法。     A method for manufacturing a glass plate, comprising a cutting step of removing widthwise ends of the glass plate while the glass plate is supported in a vertical position,
    The cutting process includes a scribing process in which a scribe line including a median crack is formed vertically on the glass plate using a scribe tool, and a folding process in which bending stress is applied to the glass plate on which the scribe line is formed to break it. including a splitting process;
    In the scribing step, the scribe line is formed such that the maximum depth of the median crack at the middle part of the scribe line is shallower than the maximum depth of the median crack at the lower part of the scribe line. A method of manufacturing a glass plate.
  2. 　前記スクライブ線の前記中間部における前記メディアンクラックの最大深さは、前記スクライブ線の上部における前記メディアンクラックの最大深さよりも浅い請求項１に記載のガラス板の製造方法。 The method for manufacturing a glass plate according to claim 1, wherein the maximum depth of the median crack in the middle part of the scribe line is shallower than the maximum depth of the median crack in the upper part of the scribe line.
  3. 　前記スクライブ線の上部における前記メディアンクラックの最大深さは、前記スクライブ線の前記中間部における前記メディアンクラックの最大深さよりも浅い請求項１に記載のガラス板の製造方法。 The method for manufacturing a glass plate according to claim 1, wherein the maximum depth of the median crack at the upper part of the scribe line is shallower than the maximum depth of the median crack at the middle part of the scribe line.
  4. 　矩形状のガラス板と、前記ガラス板が縦姿勢で積層されるパレットとを備えるガラス板梱包体であって、
    　前記ガラス板は、幅方向の端部に、上下方向に延びる端面を有しており、
    　前記端面は、メディアンクラックを含むスクライブ痕を有する折割面であり、
    　前記端面の中間部における前記メディアンクラックの最大深さは、前記端面の下部における前記メディアンクラックの最大深さよりも浅いことを特徴とするガラス板梱包体。     A glass plate package comprising a rectangular glass plate and a pallet on which the glass plates are stacked in a vertical position,
    The glass plate has an end face extending in the vertical direction at an end in the width direction,
    The end surface is a broken surface having scribe marks including a median crack,
    A glass plate package, wherein the maximum depth of the median crack at the middle part of the end face is shallower than the maximum depth of the median crack at the lower part of the end face.
  5. 　前記端面の前記中間部における前記メディアンクラックの最大深さは、前記端面の上部における前記メディアンクラックの最大深さよりも浅い請求項４に記載のガラス板梱包体。 The glass plate package according to claim 4, wherein the maximum depth of the median crack at the intermediate portion of the end face is shallower than the maximum depth of the median crack at the upper part of the end face.
  6. 　前記端面の上部における前記メディアンクラックの最大深さは、前記端面の前記中間部における前記メディアンクラックの最大深さよりも浅い請求項４に記載のガラス板梱包体。 The glass plate package according to claim 4, wherein the maximum depth of the median crack at the upper part of the end face is shallower than the maximum depth of the median crack at the middle part of the end face.
  7. 　矩形状のガラス板であって、
    　板引き方向に延びる端面を有し、
    　前記端面は、メディアンクラックを含むスクライブ痕を有する折割面であり、
    　前記端面の板引き方向における中間部の前記メディアンクラックの最大深さは、前記端面の前記板引き方向における一方の端部の前記メディアンクラックの最大深さよりも浅いことを特徴とするガラス板。     A rectangular glass plate,
    It has an end surface extending in the board drawing direction,
    The end surface is a broken surface having scribe marks including a median crack,
    A glass plate characterized in that a maximum depth of the median crack at an intermediate portion of the end face in the board drawing direction is shallower than a maximum depth of the median crack at one end of the end face in the board drawing direction.
PCT/JP2023/016482 2022-05-10 2023-04-26 Glass plate manufacturing method, glass plate, and glass plate packaging body WO2023218966A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000061676A (en) * 1998-08-19 2000-02-29 Asahi Glass Co Ltd Method and device for splitting glass plate
JP2014159359A (en) * 2012-03-28 2014-09-04 Mitsuboshi Diamond Industrial Co Ltd Scribing wheel, scribe device, scribe method, production method of display panel, and display panel
WO2017199681A1 (en) * 2016-05-18 2017-11-23 日本電気硝子株式会社 Method and device for producing glass sheet, and device for conveying glass sheet
JP2019194006A (en) * 2018-04-27 2019-11-07 三星ダイヤモンド工業株式会社 Holder unit and pin

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000061676A (en) * 1998-08-19 2000-02-29 Asahi Glass Co Ltd Method and device for splitting glass plate
JP2014159359A (en) * 2012-03-28 2014-09-04 Mitsuboshi Diamond Industrial Co Ltd Scribing wheel, scribe device, scribe method, production method of display panel, and display panel
WO2017199681A1 (en) * 2016-05-18 2017-11-23 日本電気硝子株式会社 Method and device for producing glass sheet, and device for conveying glass sheet
JP2019194006A (en) * 2018-04-27 2019-11-07 三星ダイヤモンド工業株式会社 Holder unit and pin

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