METHOD FOR TEMPERING GLASS SHEETS
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United States of America Patent
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Issued Date -
May 26, 2016
app pub date -
Nov 19, 2015
filing date -
Nov 20, 2014
priority date (Note) -
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Abstract
A method for tempering substantially flat glass sheets. A glass sheet is heated to a tempering temperature and quenching is conducted by blasting cooling air to both surfaces of the glass sheet. The quenching of a top surface and a bottom surface of the glass sheet's both side lanes is commenced earlier or is performed at the early stage of quenching more effectively than the quenching of a top surface and a bottom surface of the glass sheet's middle lane. As a result, the compressive stress required for a desired tempering degree is established on both surfaces of the side lanes earlier than on both surfaces of the middle lane. In order to achieve this, the cooling air enclosures above and below a glass sheet are provided with a subarea of weakened cooling effect.
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