Dual ion-exchange process
2014
A method for optimizing ion exchange of glass. The glass is ion exchanged in a series of two ion exchange baths. The first ion exchange bath contains an amount of a poisoning ion or salt and the second ion exchange bath contains an amount of the poisoning ion or salt that is less than that in the first bath. When the concentration of the poisoning ion/salt in the first bath reaches a maximum value, the first bath is discarded and replaced by the second bath and a third bath that initially does not contain the poisoning cation/salt replaces the second ion exchange bath. This cycling of baths may be repeated to produce a plurality of glass articles, each having a surface layer under a compressive stress and depth of layer that are within predetermined limits.
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