Forehearth frits, pearls and/or concentrates for fluorescence
AssigneeFerro Corporation
InventorsYasin Musa Mehmet Duman, Stéphane François Yves Bodin, Benoit Darbouret
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Abstract
The present invention relates to the field of forehearth frits, pearls, and/or concentrates for use in glass compositions. In particular, the present invention provides a system of forehearth frits, pearls, and/or concentrates that is capable of parting a fluorescent effect to a glass composition by adding a fluorescent glass fit, pearl or concentrate in the forehearth of a glass furnace, to form fluorescent glass and a method of using the fluorescent system of forehearth frits, pearls, and/or concentrates.
Claims14
A method for imparting a fluorescent effect to a molten base glass in the forehearth of a glass furnace, the method comprising the step of:
- a. forming a fluorescent frit, pearl, or concentrate comprising:
- from about 32 to about 47 wt % of a metal compound other than compounds including silicon, boron, alkalis, beryllium, magnesium, strontium, barium and radium, nickel, chromium, lead and cadmium,
- from about 31 to about 49 wt % SiO2,
- from about 0.2 to about 3 wt % B2O3,
- from about 12 to about 22 wt % Na2O,
- from about 0.2 to about 2 wt % CaO,
- no nickel, no chromium, no lead and no cadmium
- b. combining the fluorescent frit, pearl, or concentrate with the molten base glass contained in a forehearth so as to impart a fluorescent effect to the molten base glass;
- and
- c. cooling the molten base glass to form a fluorescent glass composition.
A method for imparting a fluorescent effect to a molten base glass in the forehearth of a glass furnace comprising the steps of:
- a. forming a fluorescent glass frit, pearl, or concentrate, which comprises:
- from about 10-36 wt % of rare earth oxide selected from the group consisting of europium oxide, terbium oxide, dysprosium oxide, gadolinium oxide, samarium oxide, thulium oxide, or combinations of thereof, and
- from about 15-65 wt % SiO2;
- from about 0-15 wt % Li2O;
- from about 0-5 wt % Al2O3;
- from about 3-25 wt % B2O3;
- from about 5-15 wt % Na2O;
- and
- from about 0-8 wt % CaO;
- b. combining the fluorescent frit, pearl, or concentrate with the molten base glass contained in a forehearth so as to impart a fluorescent effect to the molten base glass;
- and
- c. cooling the molten base glass to form a fluorescent glass composition,
- wherein the fluorescent glass frit, pearl, or concentrate is devoid of nickel, chromium, lead and cadmium.
Dependencies are inferred from the claim text.