JP6246342B2 - 薄板ガラスの後処理のための方法および当該方法に従って製造された薄板ガラス - Google Patents
薄板ガラスの後処理のための方法および当該方法に従って製造された薄板ガラス Download PDFInfo
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- JP6246342B2 JP6246342B2 JP2016518672A JP2016518672A JP6246342B2 JP 6246342 B2 JP6246342 B2 JP 6246342B2 JP 2016518672 A JP2016518672 A JP 2016518672A JP 2016518672 A JP2016518672 A JP 2016518672A JP 6246342 B2 JP6246342 B2 JP 6246342B2
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- 239000011521 glass Substances 0.000 title claims description 208
- 238000000034 method Methods 0.000 title claims description 36
- 239000005357 flat glass Substances 0.000 claims description 49
- 238000005452 bending Methods 0.000 claims description 45
- 238000012360 testing method Methods 0.000 claims description 23
- 238000012805 post-processing Methods 0.000 claims description 11
- 238000004804 winding Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 22
- 239000000203 mixture Substances 0.000 description 21
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 18
- 229910004298 SiO 2 Inorganic materials 0.000 description 18
- 239000000047 product Substances 0.000 description 18
- 229910006404 SnO 2 Inorganic materials 0.000 description 17
- 229910017493 Nd 2 O 3 Inorganic materials 0.000 description 12
- 229910018068 Li 2 O Inorganic materials 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 239000005388 borosilicate glass Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 229910052731 fluorine Inorganic materials 0.000 description 7
- 239000002241 glass-ceramic Substances 0.000 description 7
- -1 SO 3 Substances 0.000 description 6
- 239000000654 additive Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 6
- 230000018109 developmental process Effects 0.000 description 6
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 6
- 239000005331 crown glasses (windows) Substances 0.000 description 5
- 239000006025 fining agent Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000006121 base glass Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 239000005308 flint glass Substances 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 239000005368 silicate glass Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000005358 alkali aluminosilicate glass Substances 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000006018 Li-aluminosilicate Substances 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 2
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 2
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- MQWCQFCZUNBTCM-UHFFFAOYSA-N 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylphenyl)sulfanyl-4-methylphenol Chemical compound CC(C)(C)C1=CC(C)=CC(SC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=C1O MQWCQFCZUNBTCM-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 238000006124 Pilkington process Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000005354 aluminosilicate glass Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000005352 borofloat Substances 0.000 description 1
- 238000002468 ceramisation Methods 0.000 description 1
- 239000008395 clarifying agent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910021495 keatite Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000003763 resistance to breakage Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H20/00—Advancing webs
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/065—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of paper or cardboard
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
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- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/06—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle
- B65H23/10—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle acting on running web
- B65H23/105—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle acting on running web and controlling web tension
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- C03—GLASS; MINERAL OR SLAG WOOL
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- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
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- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
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- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
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- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
- C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
- C03C3/112—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine
- C03C3/115—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine containing boron
- C03C3/118—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine containing boron containing aluminium
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- Materials Engineering (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Surface Treatment Of Glass (AREA)
Description
SiO2 40−75
Al2O3 1−25
B2O3 0−16
アルカリ土類酸化物 1−30
アルカリ酸化物 0−1
SiO2 45−70
Al2O3 5−25
B2O3 1−16
アルカリ土類酸化物 1−30
アルカリ酸化物 0−1
構成成分 mol%
SiO2 56−70
Al2O3 10.5−16
B2O3 0−3
P2O5 0−3
Na2O 10−15
K2O 0−2
MgO 0−3
ZnO 0−3
TiO2 0−2.1
SnO2 0−1
F 0.001−5
成分 mol%
SiO2 61−70
Al2O3 11−14
B2O3 0−0.5
Li2O 0−0.1
Na2O 11−15
K2O 0−2
MgO 0−3
CaO 0(含有していない)
ZnO 0−1
CeO2 0−0.05
ZrO2 0(含有していない)
SnO2 0−0.3
F 0.001−3
F/B2O3 0.002−6
成分 mol%
SiO2 64−70
Al2O3 11−14
B2O3 0−0.5
Li2O 0−0.1
Na2O 11−15
K2O 0−2
MgO 0−3
CaO 0(含有していない)
ZnO <0.1
CeO2 0−0.05
ZrO2 0(含有していない)
SnO2 0−0.3
F 0.001−1
F/B2O3 0.002−2
SiO2 60−85
Al2O3 1−10
B2O3 5−20
総計Li2O+Na2O+K2O 2−16
総計MgO+CaO+SrO+BaO+ZnO 0−15
総計TiO2+ZrO2 0−5
P2O5 0−2
並びに、場合によっては、着色酸化物の添加物、例えば、Nd2O3、Fe2O3、CoO、NiO、V2O5、Nd2O3、MnO2、TiO2、CuO、CeO2、Cr2O3、0−5重量%若しくは「黒色ガラス」の場合には0−15重量%の含有量の希土類酸化物、並びに0−2重量%のAs2O3、Sb2O3、SnO2、SO3、Cl、F、CeO2等の清澄剤。
成分 重量%
SiO2 >58−65
Al2O3 >14−25
B2O3 >6−10.5
MgO 0−<3
CaO 0−9
BaO >3−8
ZnO 0−<2
成分 重量% (重量%)
SiO2 70 67−73
Al2O3 10 8−12
B2O3 10 8−12
CaO 6 4−9
BaO 1 0.5−2
SrO 3 2−4
成分 重量%
SiO2 30−85
B2O3 3−20
Al2O3 0−15
Na2O 3−15
K2O 3−15
ZnO 0−12
TiO2 0.5−10
CaO 0−0.1
SiO2 40−80
Al2O3 0−6
B2O3 0−5
総計Li2O+Na2O+K2O 5−30
総計MgO+CaO+SrO+BaO+ZnO 5−30
総計TiO2+ZrO2 0−7
P2O5 0−2
並びに、場合によっては、着色酸化物の添加物、例えば、Nd2O3、Fe2O3、CoO、NiO、V2O5、Nd2O3、MnO2、TiO2、CuO、CeO2、Cr2O3、0−5重量%若しくは「黒色ガラス」の場合には0−15重量%の含有量の希土類酸化物、並びに0−2重量%のAs2O3、Sb2O3、SnO2、SO3、Cl、F、CeO2等の清澄剤。
SiO2 55−69
Al2O3 19−25
Li2O3 3−5
総計Na2O+K2O 0−3
総計MgO+CaO+SrO+BaO 0−5
ZnO 0−4
TiO2 0−5
ZrO2 0−3
総計TiO2+ZrO2+SnO2 2−6
P2O5 0−8
F 0−1
B2O3 0−2
並びに、場合によっては、着色酸化物の添加物、例えば、Nd2O3、Fe2O3、CoO、NiO、V2O5、Nd2O3、MnO2、TiO2、CuO、CeO2、Cr2O3、0−1重量%の含有量の希土類酸化物並びに0−2重量%のAs2O3、Sb2O3、SnO2、SO3、Cl、F、CeO2等の清澄剤。
SiO2 40−75
Al2O3 10−30
B2O3 0−20
総計Li2O+Na2O+K2O 4−30
総計MgO+CaO+SrO+BaO+ZnO 0−15
総計TiO2+ZrO2 0−15
P2O5 0−10
並びに、場合によっては、着色酸化物の添加物、例えば、Nd2O3、Fe2O3、CoO、NiO、V2O5、Nd2O3、MnO2、TiO2、CuO、CeO2、Cr2O3、0−5重量%若しくは「黒色ガラス」の場合には0−15重量%の含有量の希土類酸化物、並びに0−2重量%のAs2O3、Sb2O3、SnO2、SO3、Cl、F、CeO2等の清澄剤。
SiO2 50−75
Al2O3 7−25
B2O3 0−20
総計Li2O+Na2O+K2O 0−0.1
総計MgO+CaO+SrO+BaO+ZnO 5−25
総計TiO2+ZrO2 0−10
P2O5 0−5
並びに、場合によっては、着色酸化物の添加物、例えば、Nd2O3、Fe2O3、CoO、NiO、V2O5、Nd2O3、MnO2、TiO2、CuO、CeO2、Cr2O3、0−5重量%若しくは「黒色ガラス」の場合には0−15重量%の含有量の希土類酸化物、並びに0−2重量%のAs2O3、Sb2O3、SnO2、SO3、Cl、F、CeO2等の清澄剤。
SiO2 50−75
Al2O3 7−25
B2O3 0−20
総計Li2O+Na2O+K2O 0−4
総計MgO+CaO+SrO+BaO+ZnO 5−25
総計TiO2+ZrO2 0−10
P2O5 0−5
並びに、場合によっては、着色酸化物の添加物、例えば、Nd2O3、Fe2O3、CoO、NiO、V2O5、Nd2O3、MnO2、TiO2、CuO、CeO2、Cr2O3、0−5重量%若しくは「黒色ガラス」の場合には0−15重量%の含有量の希土類酸化物、並びに0−2重量%のAs2O3、Sb2O3、SnO2、SO3、Cl、F、CeO2等の清澄剤。
Li2O 3.2−5.0
Na2O 0−1.5
K2O 0−1.5
総計Na2O+K2O 0.2−2.0
MgO 0.1−2.2
CaO 0−1.5
SrO 0−1.5
BaO 0−2.5
ZnO 0−1.5
Al2O3 19−25
SiO2 55−69
TiO2 1.0−5.0
ZrO2 1.0−2.5
SnO2 0−1.0
総計TiO2+ZrO2+SnO2 2.5−5.0
P2O5 0−3.0
Li2O 3−5
Na2O 0−1.5
K2O 0−1.5
総計Na2O+K2O 0.2−2
MgO 0.1−2.5
CaO 0−2
SrO 0−2
BaO 0−3
ZnO 0−1.5
Al2O3 15−25
SiO2 50−75
TiO2 1−5
ZrO2 1−2.5
SnO2 0−1.0
総計TiO2+ZrO2+SnO2 2.5−5.0
P2O5 0−3.0
Li2O 3−4.5
Na2O 0−1.5
K2O 0−1.5
総計Na2O+K2O 0.2−2
MgO 0−2
CaO 0−1.5
SrO 0−1.5
BaO 0−2.5
ZnO 0−2.5
B2O3 0−1
Al2O3 19−25
SiO2 55−69
TiO2 1.4−2.7
ZrO2 1.3−2.5
SnO2 0−0.4
総計TiO2+SnO2 <2.7
P2O5 0−3
総計ZrO2+0.87(TiO2+SnO2) 3.6−4.3
SiO2 61
Al2O3 18
B2O3 10
CaO 5
BaO 3
MgO 3
0.93・Min(175MPa,55MPa)=0.93・55MPa=51MPa.
Claims (17)
- 薄板ガラス(1)に引張応力を与える薄板ガラス(1)の後処理の方法であって、
当該方法において、前記後処理によって前記薄板ガラス(1)に引張応力σappが与えられ、当該引張応力は、
ここでσ ̄aおよびσ ̄eは、曲げ応力下の、前記薄板ガラス(1)の試片(10)の破断時の、前記引張応力の平均値であり、Lrefは前記試片(10)の辺長を表しており、Arefは前記試片(10)の面積を表しており、σ ̄aは、前記試片(10)の面における破断時の引張応力の平均値であり、σ ̄eは、前記試片(10)の辺から発生する破断時の引張応力の平均値であり、ΔeとΔaとは、前記平均値σ ̄e若しくはσ ̄aの標準的な偏差を表しており、Aappは前記薄板ガラス(1)の面積であり、Lappは前記薄板ガラス(1)の向かい合っている辺(22、23)の合算された辺長であり、Φは少なくとも半年間の所定の最大破断率であり、
前記所定の最大破断率Φは0.1以下であり、
前記後処理によって引張応力を与える工程の前に、ガラス強度の試験を行い、
当該試験では、前記薄板ガラス(1)の試片の破断時に、前記引張応力の平均値σ ̄ a およびσ ̄ e 、並びに、当該平均値の標準的な偏差Δ e およびΔ a を求め、これらのパラメータσ ̄ a 、σ ̄ e 、Δ e およびΔ a から、前記薄板ガラス(1)の最大引張応力を求め、
その後、前記後処理によって、前記薄板ガラス(1)に、求められた前記最大引張応力を上回らない前記引張応力σ app を与える、
ことを特徴とする方法。 - 前記所定の最大破断率Φは0.05を下回る、請求項1記載の方法。
- 前記薄板ガラス(1)の前記後処理は、帯状薄板ガラス(2)の形態の薄板ガラス(1)を巻取り、ロール(3)にすることを含んでいる、請求項4記載の方法。
- 前記最大引張応力σappを生じる前記帯状薄板ガラス(2)の前記最小曲げ半径Rは、前記ロール(3)の内側面(31)に存在する、請求項5記載の方法。
- 少なくとも100mの長さを有する帯状薄板ガラス(2)を巻取って、ロール(3)にする、請求項6記載の方法。
- 500μmを下回る厚さを有する薄板ガラス(1)を後処理する、請求項1から7までのいずれか1項記載の方法。
- 前記後処理によって、前記薄板ガラス(1)に、少なくとも21MPaである最大応力を与える、請求項1から8までのいずれか1項記載の方法。
- 前記パラメータσ ̄aおよびΔa、並びに、σ ̄eおよびΔeを求めるために、それぞれ、少なくとも10個の前記薄板ガラス(1)の試片(10)に、破断するまで、引張応力をかける、請求項1から9までのいずれか1項記載の方法。
- 前記パラメータσ ̄aおよびΔaを破断試験によって求め、
当該破断試験では、薄板ガラス試片(10)を環状に固定し、湾曲したスタンプ面(120)を有するスタンプ(12)によって、破断するまで当該薄板ガラス試片(10)に負荷を与える、請求項1から10までのいずれか1項記載の方法。 - 前記パラメータσ ̄eおよびΔeを湾曲試験によって求め、
当該湾曲試験では、薄板ガラス試片(10)を破断するまで一軸曲げする、請求項1から11までのいずれか1項記載の方法。 - 前記薄板ガラス(1)を、前記引張応力σappが与えられた状態で、少なくとも半年間保管する、請求項1から12までのいずれか1項記載の方法。
- 薄板ガラス製品であって、
薄板ガラス(1)に引張応力σappが与えられており、当該引張応力は、
ここでσ ̄aおよびσ ̄eは、曲げ応力下の、前記薄板ガラス(1)の試片(10)の破断時の引張応力の平均値であり、Lrefは前記試片(10)の辺長を表しており、Arefは前記試片(10)の面積を表しており、σ ̄aは、前記試片(10)の面における破断時の引張応力の平均値であり、σ ̄eは、前記試片(10)の辺から発生する破断時の引張応力の平均値であり、ΔeとΔaとは、前記平均値σ ̄e若しくはσ ̄aの標準的な偏差を表しており、Aappは前記薄板ガラス(1)の面積であり、Lappは前記薄板ガラス(1)の向かい合っている辺(22、23)の合算された辺長であり、Φは少なくとも半年間の、最高で0.1である最大破断率であり、
前記引張応力σ app が与えられる前に、ガラス強度の試験が行われ、
当該試験で、前記薄板ガラス(1)の試片の破断時の、前記引張応力の平均値σ ̄ a およびσ ̄ e 、並びに、当該平均値の標準的な偏差Δ e およびΔ a が求められ、これらのパラメータσ ̄ a 、σ ̄ e 、Δ e およびΔ a から、前記薄板ガラス(1)の最大引張応力が求められ、
前記引張応力σ app は、求められた前記最大引張応力を上回らない、
ことを特徴とする薄板ガラス製品。 - 前記薄板ガラス(1)に、少なくとも21MPaである最大引張応力が与えられている、請求項14から16までのいずれか1項記載の薄板ガラス製品。
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