Patent ID: 9573832
Date: 2017-02-21
CPC Classifications: C03B,G05D

Claim:
1. A method of reforming glass, comprising: (a) placing a glass sheet on a mold having a shaping surface for forming the glass sheet into a shaped glass article; (b) selecting a target starting mold forming temperature for the mold and a first temperature window comprising the target starting mold forming temperature; (c) selecting a target starting glass forming temperature for the glass sheet and a second temperature window comprising the target starting glass forming temperature; (d) providing a first furnace condition controlled to a first furnace temperature set point above the target starting mold forming temperature; (e) simultaneously exposing the glass sheet and mold to the first furnace condition until a temperature of the mold is within the first temperature window; (f) providing a second furnace condition controlled to a second furnace temperature set point above the target starting mold forming temperature but below the first furnace temperature set point; (g) simultaneously exposing the glass sheet and mold to the second furnace condition until a temperature of the glass sheet is within the second temperature window; (h) starting forming of the glass sheet into the shaped glass article after the temperature of the glass sheet is within the second temperature window; (i) providing a third furnace condition controlled to a third furnace temperature set point above the second furnace temperature set point but below the first furnace temperature set point; and (j) prior to the simultaneously exposing of (g), simultaneously exposing the glass sheet and mold to the third furnace condition for a time period during which the temperature of the glass sheet drops from a first level at the end of the simultaneously exposing of step (e) to a second level between the first level and the target starting glass forming temperature.