Owens-brockway Glass Container Inc.

James E Fenstermacher

Garrett L Scott

Joseph J Hammel

Robert N Clark

Steven M Weiser

Apparatus for forming a cased glass stream having an inner core glass surrounded by an outer casing glass that includes a spout for delivering core glass from a first source through a first orifice. A second orifice is vertically spaced beneath and aligned with the first orifice, and is surrounded by an annular chamber that communicates with the second orifice through a gap between the first and second orifices. A tube delivers casing glass from the outlet opening of a casing glass spout to the annular chamber in such a way that glass flows by gravity through the orifices from the first and second sources to form the cased glass stream. A hollow tube within the casing glass spout is positioned with respect to the spout outlet opening for metering flow of casing glass through the outlet opening and delivery tube to the annular chamber surrounding the orifices. The interior of the hollow tube is coupled to a source of gas under pressure so as to maintain the tube interior, and the interior of the thin fall of casing glass through the spout outlet opening, at a pressure above ambient pressure surrounding the casing glass spout. This elevated gas pressure within the casing glass fall reverses the pressure differential between the interior and exterior of the spout outlet opening, so that any tendency for air to migrate through the refractory material surrounding the outlet opening and into the casing glass fall is eliminated.

Method and apparatus for delivering a cased glass stream

Apparatus for delivering a cased glass stream

A container glass composition that reduces U.V. light transmission below a wavelength of about 400 nanometers, the composition having melting and forming properties similar to soda-lime-silica glass and containing SiO.sub.2, CaO, MgO, K.sub.2 O, SO.sup.-.sub.3, and a U.V. absorbing amount of about 0.4 to 0.8 weight percent FeO+Fe.sub.2 O.sub.3, and about 2 to 4 weight percent of MnO+MnO.sub.2.

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Maumee, OH, United States of America

James E Fenstermacher