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Methods of cutting a laminate strengthened glass substrate

  • US 9,212,081 B2
  • Filed: 03/13/2013
  • Issued: 12/15/2015
  • Est. Priority Date: 11/21/2012
  • Status: Active Grant
First Claim
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1. A method of cutting a laminate strengthened glass substrate, the method comprising:

  • providing a laminate strengthened glass substrate comprising;

    a glass core layer having a first surface portion and a second surface portion opposite the first surface portion;

    at least one glass cladding layer fused to the first surface portion or the second surface portion of the glass core layer, wherein the glass core layer has an average core coefficient of thermal expansion CTEcore, and the at least one glass cladding layer has an average cladding coefficient of thermal expansion CTEcladding which is less than the average core coefficient of thermal expansion CTEcore;

    forming an edge defect at an edge of the laminate strengthened glass substrate;

    heating a first region of the laminate strengthened glass substrate on the at least one glass cladding layer, wherein the first region is offset from a first side of a desired line of separation;

    heating a second region of the laminate strengthened glass substrate on the at least one glass cladding layer, wherein the second region is offset from a second side of the desired line of separation, and the second region is simultaneously heated with the first region; and

    propagating a crack along the desired line of separation between the first and second regions of the laminate strengthened glass substrate, wherein the crack is initiated at the edge defect.

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