Method for bending a glass sheet

Details Method for bending a glass sheet Method for bending a glass sheet

2008-07-22

2008-07-22

Griffin, Steven P. (Department: 1791)

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

C065S106000, C065S029110, C065S029190, C065S162000, C065S273000

Reexamination Certificate

active

10674354

ABSTRACT:
A glass sheet, which has been heated to have a viscosity of not lower than 105Pa·s and not higher than 108Pa·s, is pressed against a mold having a certain bending surface to be bent. There are a step for controlling a bending temperature T and a bending time period t for the glass sheet so as to satisfy the following formulas 1 and 2, and a step for bending the glass sheet:in-line-formulae description="In-line Formulae" end="lead"?0.05<φ<2.00Formula 1in-line-formulae description="In-line Formulae" end="tail"?ϕ=∫0t⁢P⁡(τ)η⁡(T)⁢ⅆτFormula⁢⁢2where P(τ) is a surface pressure difference (unit: Pa) between a pressure applied on a primary surface of the glass sheet and a pressure applied on a rear surface of the glass sheet at a time τ, t is a bending time period (unit: s), η(T) is the viscosity (unit: Pa·s) of the glass sheet at a temperature T, and T is a bending temperature (unit: ° C.) at the time τ.

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