Method and apparatus for making a glass laminate
AssigneeCorning Incorporated
InventorsGuangli Hu, Bin Zhang, Chunfeng Zhou
Life of this patent
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Abstract
An apparatus for making a glass laminate, including: a source of a glass core sheet; a source of a first force that tensions the glass core sheet in a first axial direction; a source of a second force that tensions the glass core sheet in a second axial direction; and at least one molten glass reservoir extending along a length of the apparatus and on opposite sides of the glass core sheet that delivers a source of at least two glass clads to the opposite side surfaces of the bi-axially tensioned glass core sheet. Also disclosed are methods for making a glass laminate sheet using the disclosed apparatus, as defined herein.
Claims5
A method for strengthening a glass laminate, the glass laminate having a glass core sheet and at least one glass clad layer on at least one of the opposite sides of the glass core sheet, comprising:
- heating the glass laminate, the glass laminate having the glass core sheet has a strain point having a difference of at least 50° C. compared to the strain point of the at least one glass clad layer;
- applying biaxial force to the glass core sheet while the glass clad layers are in a state of stress relaxation;
- cooling the glass laminate;
- and
- releasing the biaxial force on the glass core sheet.
A method for strengthening a glass laminate, the glass laminate having a glass core sheet and a glass clad layer on at least one of the opposite sides of the glass core sheet, comprising:
- a first heating of the glass laminate to 50° C. below the strain point of the glass core sheet, and the glass core sheet has a strain point of at least 50° C. higher than the strain point of the glass clad layer;
- a second heating of the glass laminate to between the anneal point of the glass clad and the strain point of the glass core sheet, the second heating is accomplished at a temperature above the strain point of the clad layer and below the strain point of the core sheet;
- bi-axially tensioning the second heated glass laminate at from 10 to 50 MPa for a sufficient time for the stress in the clad layers to relax;
- cooling the laminate to ambient temperature;
- and
- removing the bi-axial tensioning.
Dependencies are inferred from the claim text.