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US 4,337,073 AGranted
Rotary forehearth
AssigneePPG Industries, Inc.
InventorWarren W. Drummond
Life of this patent
Estimating the term…
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AssigneePPG Industries, Inc.
InventorWarren W. Drummond
Estimating the term…
A rotary forehearth for use particularly in formation of glass fiber filaments through bushings is disclosed. A stator portion of the forehearth carries the bushings and a rotor portion of the forehearth receives molten glass from a suitable supply source, mixing the glass to homogenize it and distribute it at a uniform temperature, and disperses the uniform temperature molten glass to the bushings. The rotary forehearth is heated by suitable assemblies which maintain all portions of the forehearth at a uniform teperature. A uniform heating of the rotary forehearth and a uniform mixing and temperature of the molten glass is provided with a single controller. The bushings are uniformly heated and are supplied with molten glass at a nearly constant viscosity to facilitate the formation of glass fiber filaments having substantially less variation in diameter than heretofore possible.
A rotary forehearth for producing glass fiber filaments from molten glass supplied to said rotary forehearth from a supply of said molten glass, said rotary forehearth comprising:
A process of forming glass fiber filaments in a rotary forehearth from molten glass including the steps of:
A process of forming glass fiber filaments comprising passing a molten glass stream into a plurality of streams of small cross-sectional area in a rotating channel, feeding small streams of molten glass from said rotating channel to a second channel continuously, feeding molten glass from said second channel to a glass fiber forming bushing continuously while maintaining the temperatures of the channels and glass contained therein constant.
Dependencies are inferred from the claim text.