METHOD FOR PRODUCING AIR-QUENCH TOUGHENED GLASS PLATE

摘要

In a production process for air-quench toughened glass plates, a failed glass plate containing nickel sulfide (NiS) is removed through subjecting it to an effective forced fracture. Such forced fracture is carried out during batchwise soaking treatment after a toughening step, or in a toughening step after causing cracks to occur in an annealing step before the toughening step, or in a toughening step after causing cracks to occur in a pretreatment step before the toughening step, or during continuous annealing after a toughening step. This method can be used for producing a high quality toughened glass plate free of NiS.