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Apparatus and method for severing a glass sheet

  • US 10,239,778 B2
  • Filed: 11/26/2014
  • Issued: 03/26/2019
  • Est. Priority Date: 12/03/2013
  • Status: Active Grant
First Claim
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1. A method for severing a strengthened glass sheet comprising a glass core layer disposed between a first glass cladding layer and a second glass cladding layer, each of the first glass cladding layer and the second glass cladding layer comprising a lower coefficient of thermal expansion than the glass core layer such that the glass core layer comprises a tensile stress, the method comprising:

  • preferentially heating a region of the glass sheet to at least a softening temperature of the glass sheet to form a softened region, wherein a remote region of the glass sheet disposed away from the region remains below an annealing temperature of the glass sheet during the preferentially heating;

    forming a slit in the softened region of the glass sheet to form a slit region, the slit extending at least partially into a thickness of the glass sheet; and

    preferentially applying heat to the slit region of the glass sheet.

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