Bulk annealing of glass sheets
First Claim
1. A method of annealing glass, comprising:
- providing a ribbon of glass, the ribbon of glass having two major surfaces;
forming a surface modification layer on at least one surface of the ribbon of glass, wherein the surface modification layer is one of HDMA, a plasma polymerized fluoropolymer, or an aromatic silane;
rolling the ribbon of glass into a roll such that the ribbon of glass defines a plurality of glass layers so that interfaces are defined between adjacent ones of the glass layers in the plurality of glass layers;
exposing the glass layers to a time-temperature cycle sufficient to compact each of the glass layers,wherein the surface modification layer is sufficient to control, throughout the time-temperature cycle, annealing between the adjacent ones of the glass layers in the stack defining the one of the interfaces such that the layers may be separated without breaking one of the adjacent ones of the glass layers into two or more pieces.
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Abstract
Surface modification layers and associated heat treatments, that may be provided on a sheet, a carrier, or both, to control both room-temperature van der Waals (and/or hydrogen) bonding and high temperature covalent bonding between the thin sheet and carrier. The room-temperature bonding is controlled so as to be sufficient to hold the thin sheet and carrier together during vacuum processing, wet processing, and/or ultrasonic cleaning processing, for example. And at the same time, the high temperature covalent bonding is controlled so as to prevent a permanent bond between the thin sheet and carrier during high temperature processing, as well as maintain a sufficient bond to prevent delamination during high temperature processing.
226 Citations
10 Claims
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1. A method of annealing glass, comprising:
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providing a ribbon of glass, the ribbon of glass having two major surfaces; forming a surface modification layer on at least one surface of the ribbon of glass, wherein the surface modification layer is one of HDMA, a plasma polymerized fluoropolymer, or an aromatic silane; rolling the ribbon of glass into a roll such that the ribbon of glass defines a plurality of glass layers so that interfaces are defined between adjacent ones of the glass layers in the plurality of glass layers; exposing the glass layers to a time-temperature cycle sufficient to compact each of the glass layers, wherein the surface modification layer is sufficient to control, throughout the time-temperature cycle, annealing between the adjacent ones of the glass layers in the stack defining the one of the interfaces such that the layers may be separated without breaking one of the adjacent ones of the glass layers into two or more pieces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification