Glass manufacturing – Glassworking or preform by or with reheating means – Mechanical means to reshape preform
Patent
1975-06-16
1977-03-01
Lindsay, Jr., Robert L.
Glass manufacturing
Glassworking or preform by or with reheating means
Mechanical means to reshape preform
65109, 65110, 65 87, 65280, 65296, 65297, C03B 2304, C03B 2100
Patent
active
040100227
ABSTRACT:
Tubes of transparent, translucent or opaque fused silica are made by heating a hollow cylindrical blank in a drawing zone, drawing the blank from the zone while maintaining its interior under pressure and rotating same about its longitudinal axis, and calibrating the still-plastic tube immediately upon leaving the drawing zone in a calibration zone defined by two graphite plates. Apparatus for carrying out the method includes means for heating the blank to a drawing temperature in a drawing zone, means for drawing the blank from the zone, means for maintaining the interior of the blank under pressure and means for rotating the blank as it is drawn, and calibrating means for calibrating the still-plastic tube immediately upon leaving the drawing zone including two graphite plate means disposed on metal plates through which a coolant can flow.
REFERENCES:
patent: 1645086 (1927-10-01), Berry et al.
patent: 1653848 (1927-12-01), Grotta
patent: 1766638 (1930-06-01), Howard
patent: 1857791 (1932-05-01), Peiler
patent: 2393979 (1946-02-01), Everett
patent: 3229005 (1966-01-01), Reifenhauser
patent: 3309188 (1967-03-01), Porter et al.
patent: 3449105 (1969-06-01), Dieman et al.
patent: 3853522 (1974-12-01), Guenthmer
Heraeus-Schott Quarzschmelze GmbH
Lindsay, Jr. Robert L.
Miga Frank W.
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