Thin dicing glass article

Patent metadata

Field	Value
Publication number	US-9783448-B2
Application number	US-201514814303-A
Country	US
Kind code	B2
Filing date	Jul 30, 2015
Priority date	Jul 31, 2014
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A strengthened glass sheet product along with a process and an apparatus for strengthening a glass sheet are provided. The process comprises cooling the glass sheet by non-contact thermal conduction for sufficiently long to fix a surface compression and central tension of the sheet. The process results in thermally strengthened glass sheets having improved breakage properties.

First claim

What is claimed is:

1. A thermally strengthened glass sheet:
the glass sheet having a thickness, expressed in millimeters, of t, a length, expressed in millimeters, of l, and a width, expressed in millimeters, of w, t being less than l and less than w;
the glass sheet having a first major surface and a second major surface separated by the thickness t;
the glass sheet comprising a glass having a low temperature linear CTE, expressed in 1/° C., of α S CTE , a high temperature linear CTE, expressed in 1/° C., of α L CTE , an elastic modulus, expressed in GPa, of E, a strain temperature, expressed in units of ° C., of T strain , and a softening temperature, expressed in units of ° C., of T soft ;
the glass sheet having a thermally induced central tension of less than 400 MPa and greater than

P

1
⁢
C
⁢

⁢
T

⁡

(

h

C
⁢

⁢
T

)

*
t

2
⁢

(

P

2
⁢
C
⁢

⁢
T

⁡

(

h

C
⁢

⁢
T

)

+
t

)

·
E
·

[

T
strain

·

α

C
⁢

⁢
T
⁢

⁢
E

s

+

α

C
⁢

⁢
T
⁢

⁢
E

L

·

(

T
soft

-

T
strain

)

]

;

in units of MPa;
wherein P 1CT is given by

910.2
-

259.2
·

exp
⁡

(

-

h

C
⁢

⁢
T

0.143

)

;

P 2CT is given by

2.53
+

23.65

(

1
+

(

h

C
⁢

⁢
T

0.00738

)

1.58

)

;

and h CT is greater than or equal to 0.0625,
wherein the first major surface has a roughness in the range of from 0.2 to 0.4 nm Ra over an area of 10 μm×10 μm.

2. The glass sheet according to claim 1 wherein h CT is greater than or equal to 0.063.

3. The glass sheet according to claim 1 wherein h CT is greater than or equal to 0.065.

4. The glass sheet accordi

Assignees

• Corning Inc

Inventors

• Maschmeyer Richard Orr
• Thomas John Christopher
• Wasson Kevin Lee

Classifications

• B60J1/001

  Double glazing for vehicles · CPC title

• B32B17/10036

  comprising two outer glass sheets · CPC title

• C03B27/0404

  Nozzles, blow heads, blowing units or their arrangements, specially adapted for flat or bent glass sheets · CPC title

• Y10T428/315

  Surface modified glass [e.g., tempered, strengthened, etc.] · CPC title

• C03B29/16

  Glass sheets · CPC title