Method of strengthening glass article formed of float glass by i

Details Method of strengthening glass article formed of float glass by i Method of strengthening glass article formed of float glass by i

1986-03-07

1987-06-09

Lindsay, Robert

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 992, 428410, C03C 2100

Patent

active

046718141

ABSTRACT:
The invention relates to a method of strengthening a glass article formed of sheet glass produced by the float process. The strengthening method includes a known ion exchange treatment to replace alkali metal ions in the surface layers of the glass with, e.g., alkali metal ions larger in ionic radius such as potassium ions. To prevent warping of the glass article during the ion exchange treatment by the influence of a metal element such as tin used as the molten metal in the float process and diffused into one surface of the sheet glass, the glass article is pretreated by contacting at least said surface with an external source of sodium ions and/or lithium ions and heating the glass article together with the external source of the alkali metal ions at 350.degree.-650.degree. C. for 0.01-100 hr. The pretreatment is neither preceded nor followed by grinding or polishing of said surface of the glass. By incorporating the pretreatment, the ion exchange strengthening can be accomplished to a high degree without degrading flatness and surface smoothness of the glass even when the glass thickness is not more than about 3 mm.

REFERENCES:
patent: 3453095 (1969-07-01), Loukes et al.
patent: 3533888 (1970-10-01), Eppler et al.
patent: 3630704 (1971-12-01), Garfinkel et al.
patent: 3798013 (1974-03-01), Inoue et al.
patent: 3990877 (1976-11-01), Simmons

Affiliated with

Also associated with

Rating

Method of strengthening glass article formed of float glass by i does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of strengthening glass article formed of float glass by i, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of strengthening glass article formed of float glass by i will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1826882