Glass manufacturing – Processes – Glass preform treating
Patent
1980-08-04
1982-02-09
Kellogg, Arthur D.
Glass manufacturing
Processes
Glass preform treating
65115, 65348, 65351, C03B 2704
Patent
active
043148360
ABSTRACT:
In tempering a glass sheet, particularly a glass sheet having at least one major dimension more than 0.5 meter, by quenching said sheet with cold tempering medium while at a tempering temperature, prior art tempering apparatus developed insufficient temper particularly in the central portion of the glass sheet, as evidenced by fragments from the central portion exceeding code requirements for maximum size on destruction testing. The present invention provides a novel construction and arrangement of the tempering medium supply system that provides relatively wide escape paths in the direction of the glass sheet thickness for blasts of tempering medium applied toward the central portion of the glass sheet compared to the escape paths provided in said direction for blasts of tempering medium applied to the portion of the glass sheet beyond the central portion. The resulting tempered glass sheets processed using the present invention have fragments that meet code requirements in the central portion as well as the portion beyond the central portion when subjected to destruction testing.
REFERENCES:
patent: 2401442 (1946-06-01), Weihs
patent: 3125430 (1964-03-01), Richardson
patent: 3186815 (1965-06-01), Jochim
patent: 3294519 (1966-12-01), Fickes
patent: 3332761 (1967-07-01), Fredley et al.
patent: 3353946 (1967-11-01), McMaster
patent: 3455671 (1969-07-01), McMaster
patent: 3776712 (1973-12-01), Wilde
patent: 3846106 (1974-11-01), Seymour
Kellogg Arthur D.
Lepiane Donald Carl
Mates Edward I.
PPG Industries Inc.
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