Method for making crystallized glass by rolling and heat treating and apparatus

摘要

A consecutive molding method for crystallized glass comprises: a melting process to obtain molten glass by melting glass raw materials; a molding process to obtain a band-shaped plate glass by roll forming the molten glass to become band-shaped; a crystallization process to obtain a band-shaped crystallized glass plate by conducting thermal treatment on the band-shaped plate glass to crystallize it; and a cutting process to cut the band-shaped crystallized glass plate, wherein the crystallization process includes: a crystal nucleus-formation process to form crystal nuclei in the band-shaped plate glass obtained in the molding process by disposing the band-shaped plate glass in the atmosphere of a crystal nucleus-formation temperature and retaining it at the temperature; a temperature-raising process to raise the temperature of the band-shaped plate glass where crystal nuclei have been formed to a crystal-growth temperature; a crystal-growth process to retain the band-shaped plate glass where crystal nuclei have been formed at the crystal-growth temperature such that the glass is crystallized to produce a band-shaped crystallized glass plate; and a slow-cooling process to slowly cool down the band-shaped crystallized glass plate.