US2017096364A1PendingUtilityA1
Long-term bendable glass material, and method for the production of a long-term bendable glass material
Est. expiryOct 2, 2035(~9.2 yrs left)· nominal 20-yr term from priority
Inventors:Clemens OttermannKurt NattermannMarkus Heiß-ChouquetJürgen VogtThomas RoßmeierAndreas Habeck
B65H 75/08C03B 23/0066G01N 3/20C03C 3/091C08K 3/40B65H 2701/1842C03C 3/085B32B 17/10G01N 2203/0282C03B 23/02G01N 2203/0062C03C 3/093C03C 3/083C03C 3/087G01N 33/386
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Claims
Abstract
A long-term bendable glass material includes a glass material having a bending radius in a range of 1 mm to 10 7 mm. The glass material is structured such that a number of breaks developing over a course of time after a storage period of at least one day displays a remaining probability of breaking of less than 0.1 for a storage time period of a maximum of half a year.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A long-term bendable glass material, comprising:
a glass material having a bending radius in a range of 1 mm to 10 7 mm, said glass material being structured such that a number of breaks developing over a course of time after a storage period of at least one day displays a remaining probability of breaking of less than 0.1 for a storage time period of a maximum of half a year.
2 . The long-term bendable glass material according to claim 1 , wherein said glass material is a glass ribbon having a maximum thickness of 500 μm and a minimum thickness of 3 μm.
3 . The long-term bendable glass material according to claim 1 , wherein said bending radius is between 10 mm to 10 3 mm.
4 . The long-term bendable glass material according to claim 1 , wherein said remaining probability of breaking is less than 0.01.
5 . The long-term bendable glass material according to claim 1 , wherein said glass material comprises the following components in weight-%:
SiO 2 40-75; Al 2 O 3 1-25; B 2 O 3 0-16; alkaline earth oxide 1-30; and alkali oxide 0-20.
6 . The long-term bendable glass material according to claim 1 , wherein said glass material is wound onto a roll and is under a tensile stress that is less than:
1.15
·
Min
(
σ
_
a
-
Δ
a
0.4
·
(
1
-
ln
(
A
ref
A
App
Φ
)
)
,
σ
_
e
-
Δ
e
0.4
·
(
1
-
ln
(
L
ref
L
App
Φ
)
)
)
,
whereby σ a and σ e are average values of tensile stress on breakages of samples of glass material that are subjected to bending stresses, whereby L ref describes an edge length and A ref describes a surface of a sample, whereby σ a is the average value of the tensile stress in the surface of the sample during breaking, and σ e is the average value of the tensile stress on a break originating from the edge of the sample, and whereby Δ e and Δ a are standard deviations of the average values σ e or respectively σ a , and whereby A app is a surface of glass material and L app a sum of edge lengths of opposite edges of glass material and Φ a maximum breakage quota of 0.1 at most within a time period of at least half a year.
7 . A method for producing long-term bendable glass material, comprising:
bending a glass material in a bending radius in a range of 1 mm to 10 7 mm; storing said bent glass material for a time period of at least 1 day; inspecting at least a portion of said bent glass material for damage after said storing; and classifying said inspected bent glass material as a reject if damage is detected or as a long-term bendable glass material if no damage is detected.
8 . The method according to claim 7 , further comprising winding said glass material onto a roll, said glass material having a maximum thickness of 500 μm and a minimum thickness of 3 μm.
9 . The method according to claim 8 , further comprising rewinding said wound glass material from said roll onto a second roll.
10 . The method according to claim 7 , wherein said glass material comprises the following components in weight-%:
SiO 2 40-75; Al 2 O 3 1-25; B 2 O 3 0-16; alkaline earth oxide 0-30; and alkali oxide 0-20.
11 . The method according to claim 7 , wherein said inspected glass material is a cut-off of said bent glass material.
12 . The method according to claim 7 , wherein said glass material comprises at least one coating.
13 . The method according to claim 7 , further comprising pre-treating said glass material prior to said bending.
14 . The method according to claim 7 , wherein said glass material is a composite material having a polymer film.
15 . The method according to claim 7 , wherein said glass material is stored at least one of at a relative humidity in a range between 40% and 100% and at a temperature in a range between 10° C. and 30° C.
16 . A method for proof testing glass material, comprising:
bending a glass material; storing said bent glass material for a period of at least 1 day; determining a crack depth in said glass material after said storing; comparing said determined crack depth with a predefined crack depth; and classifying said glass material as a long-term bendable glass material if said crack depth is less than said predetermined crack depth such that a remaining probability of breaking is less than 0.1 for a maximum storage period of half a year.
17 . The method according to claim 16 , further comprising defining said predetermined crack depth as ((K 1c ·R)/(E·d)) 2 , wherein K 1c is a fracture toughness of said glass material, R is a bending radius of said glass material, E is an elasticity modulus of said glass material, and d is a thickness of said glass material.
18 . The method according to claim 17 , wherein at least one of said fracture toughness is in a range of 0.1 to 1.5 MPa·√m, said elasticity modulus is in a range of 40 to 150 GPa, and said bending radius is in a range of 1 mm to 10 7 mm.
19 . The method according to claim 16 , wherein said glass material comprises the following components in weight-%:
SiO 2 40-75; Al 2 O 3 1-25; B 2 O 3 0-30; and alkali oxide 0-20.
20 . The method according to claim 16 , wherein said glass material comprises at least one coating.
21 . The method according to claim 16 , further comprising pre-treating said glass material prior to said bending.
22 . The method according to claim 16 , wherein said glass material is a composite material having a polymer film.Join the waitlist — get patent alerts
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