Patent ID: 7434420

Claim:
A process for molding glass material using a mold, comprising the steps of: gradually increasing a working temperature to a formation temperature T 1 while maintaining a normal pressing force and an initial mold position, the formation temperature T 1 being 25-45° C. higher than a glass transition temperature Tg of the glass material; maintaining the formation temperature T 1 for about 60 seconds, and during this period: increasing the normal pressing force to a first pressing force P 3 , the first pressing force P 3 being in the range of 200-400 newtons, and maintaining the first pressing force P 3 for about 5 seconds while gradually compacting the mold position; increasing the first pressing force P 3 to a second pressing force P 2 , the second pressing force P 2 being in the range of 500-700 newtons, and maintaining the second pressing force P 2 for about 10 seconds while gradually compacting the mold position; and increasing the second pressing force P 2 to a formation pressing force P 1 , the formation pressing force P 1 being in the range of 700-900 newtons, and maintaining the formation pressing force P 1 for about 45 seconds while holding the mold in a most compacting position; decreasing the formation pressing force P 1 to a cooling pressing force P 4 , the cooling pressing force P 4 being in the range of 300-500 newtons; and gradually decreasing the formation temperature T 1 to a slow-cooling temperature T 3 while maintaining the cooling pressing force P 4 and gradually de-compacting the mold position, the slow-cooling temperature T 3 being 5-25° C. lower than the glass transition temperature Tg.