Forming method of glass element

Details Forming method of glass element Forming method of glass element

1998-07-24

2000-06-27

Silverman, Stanley S.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65 37, 65 39, 65318, 65404, C03B 1105

Patent

active

060792280

ABSTRACT:
A method of molding a glass element in which a glass material is heated and then press-molded between an upper mold and a lower mold when a temperature of the heated glass material reaches a predetermined temperature. A first cooling of the glass element is performed with the glass element in contact with the pair of molds until a temperature of the glass element is within a range of .+-.20.degree. C. of a glass transition point of the glass material while a pressure applied to the glass element by the upper and lower molds is gradually reduced until the pressure becomes 0 kg/cm.sup.2. Subsequently, a second cooling of the glass element is performed without the upper and lower molds contacting the patterned surface on the glass element. The upper mold has a bottom surface and a sidewall surface with a lowermost end portion of the side wall surface, adjacent the bottom surface, being inclined with respect to a central axis of the upper mold.

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