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1. (CA2522807) METHOD AND APPARATUS FOR STRENGTHENING GLASS

Office : Canada
Application Number: 2522807 Application Date: 31.03.2004
Publication Number: 2522807 Publication Date: 04.11.2004
Publication Kind : A1
Prior PCT appl.: Application Number:US2004009716 ; Publication Number: Click to see the data
IPC:
C03C 21/00
C CHEMISTRY; METALLURGY
03
GLASS; MINERAL OR SLAG WOOL
C
CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
21
Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals into the surface
CPC:
C03C 21/002
Applicants: THE COCA-COLA COMPANY
Inventors: POSTUPACK, DENNIS
LACOURSE, WILLIAM
Priority Data: 10/813,435 31.03.2004 US
60/464,356 22.04.2003 US
Title: (EN) METHOD AND APPARATUS FOR STRENGTHENING GLASS
(FR) PROCEDE ET APPAREIL DE RENFORCEMENT DU VERRE
Abstract:
(EN) The invention relates to a method and apparatus for strengthening glass. A method according to one aspect of the invention strengthens glass by applying potassium ions to the surface of a glass article with the surface being at least the annealing point temperature of the glass and then keeping the temperature of the glass between the strain point temperature of the glass and about 150~C below the strain point temperature for at least about five minutes to facilitate a more efficient ion-exchange reaction. In one embodiment, the glass articles may be dipped in a salt bath to apply the ions. In an alternative embodiment, the glass articles may be sprayed with molten potassium salt to apply the ions. As a result of the methods of the invention, the treated glass articles may be strengthened by having an increased surface stress or may contain less glass with no change in strength as compared to the same untreated glass article.