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1. 发明公开

EP2445843A1 VERFAHREN UND VORRICHTUNG ZUM ZIEHEN EINES QUARZGLASZYLINDERS AUS EINEM SCHMELZTIEGEL 审中-公开
标题翻译：方法和装置拉石英玻璃圆柱体从坩埚
公开(公告)号：EP2445843A1
公开(公告)日：2012-05-02
申请号：EP10724515.1
申请日：2010-06-15
申请人： Heraeus Quarzglas GmbH & Co. KG
发明人： LEBER, Helmut , BERG, Rainer , WHIPPEY, Nigel
IPC分类号： C03B17/04
CPC分类号： C03B17/04 , Y02P40/57
摘要： The invention relates to a known method for drawing a quartz glass cylinder from a melt crucible comprising an inner crucible chamber extending in the direction of a center crucible axis and bounded by a side wall and a floor, wherein SiO
2 granulate is fed into the melt crucible and therein softened into a quartz glass mass, and said mass is drawn vertically downward as a cylindrical quartz glass strand by means of a first draw-off device through a first draw nozzle provided in the floor of the melt crucible, and the quartz glass cylinder is cut off therefrom. In order to disclose a method starting herefrom and allowing the production of homogenous quartz glass cylinder at simultaneously high levels of productivity, the invention proposes that at least one second quartz glass strand is drawn off through at least one further second draw nozzle provided in the floor of the melt crucible, wherein the first draw nozzle and the second draw nozzle are disposed eccentrically to the center crucible axis and at a distance from each other.

2. 发明授权

EP2303787B1 VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG EINES QUARZGLASZYLINDERS 有权
标题翻译：方法和设备用于生产石英玻璃圆柱体
公开(公告)号：EP2303787B1
公开(公告)日：2012-02-01
申请号：EP09769315.4
申请日：2009-06-25
申请人： Heraeus Quarzglas GmbH & Co. KG
发明人： LEBER, Helmut , BERG, Rainer , WHIPPEY, Nigel
IPC分类号： C03B17/04 , C03B5/182
CPC分类号： C03B17/04 , C03B5/0336 , C03B5/182
摘要： In a known method for drawing a tubular quartz glass strand, SiO
2 -containing starting material is fed to a melting crucible, softened therein into a viscous quartz glass mass (27), and said mass is pulled vertically downward as a cylindrical quartz glass strand (5; 33) through a die (4; 34) provided in the bottom region of the melting crucible (1), said die having a gap-shaped outlet (25; 36), which is defined by a bottom opening and a die inside part, and thereafter the quartz glass cylinder is cut to length. In order to provide a method starting from this which facilitates the production of homogeneous quartz glass cylinders, even if the lateral dimensions thereof are in the range of the inside diameters of conventional melting crucibles (1), according to the invention the viscous quartz glass mass is drawn over a flow constriction (12; 32) provided in an upper region of the die (4; 34) and leading downward into the outlet (25; 36) via a flow channel, said region facing the crucible interior, wherein the outlet has an opening width that is larger than the width of the flow constriction (12; 32), and wherein a first minimum circumscribed circle around the flow constriction (12; 32) has a diameter that is a maximum of 30% of the diameter of a second minimum circumscribed circle around the quartz glass strand (5; 33) to be drawn. The invention further relates to a corresponding apparatus.

3. 发明公开

EP2303787A1 VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG EINES QUARZGLASZYLINDERS 有权
标题翻译：方法和设备用于生产石英玻璃圆柱体
公开(公告)号：EP2303787A1
公开(公告)日：2011-04-06
申请号：EP09769315.4
申请日：2009-06-25
申请人： Heraeus Quarzglas GmbH & Co. KG
发明人： LEBER, Helmut , BERG, Rainer , WHIPPEY, Nigel
IPC分类号： C03B17/04 , C03B5/182
CPC分类号： C03B17/04 , C03B5/0336 , C03B5/182
摘要： In a known method for drawing a tubular quartz glass strand, SiO
2 -containing starting material is fed to a melting crucible, softened therein into a viscous quartz glass mass (27), and said mass is pulled vertically downward as a cylindrical quartz glass strand (5; 33) through a die (4; 34) provided in the bottom region of the melting crucible (1), said die having a gap-shaped outlet (25; 36), which is defined by a bottom opening and a die inside part, and thereafter the quartz glass cylinder is cut to length. In order to provide a method starting from this which facilitates the production of homogeneous quartz glass cylinders, even if the lateral dimensions thereof are in the range of the inside diameters of conventional melting crucibles (1), according to the invention the viscous quartz glass mass is drawn over a flow constriction (12; 32) provided in an upper region of the die (4; 34) and leading downward into the outlet (25; 36) via a flow channel, said region facing the crucible interior, wherein the outlet has an opening width that is larger than the width of the flow constriction (12; 32), and wherein a first minimum circumscribed circle around the flow constriction (12; 32) has a diameter that is a maximum of 30% of the diameter of a second minimum circumscribed circle around the quartz glass strand (5; 33) to be drawn. The invention further relates to a corresponding apparatus.

4. 发明公开

EP1993959A1 METHOD AND DEVICE FOR DRAWING A TUBULAR STRAND OF QUARTZ GLASS 审中-公开
标题翻译：方法和装置拉管子火车从石英玻璃
公开(公告)号：EP1993959A1
公开(公告)日：2008-11-26
申请号：EP07726677.3
申请日：2007-03-07
申请人： Heraeus Quarzglas GmbH & Co. KG
发明人： HORN, Roland , LEBER, Helmut , TROMMER, Martin , WHIPPEY, Nigel , BERG, Rainer , BECKER, Joerg , GERHARDT, Rolf
IPC分类号： C03B17/04
CPC分类号： C03B17/04 , C03B5/0336
摘要： In a known method for drawing a tubular quartz glass strand, a crucible is fed with SiO2-containing start material, the start material is softened in the crucible and, as a softened quartz glass mass, is drawn vertically downwards as a tubular quartz glass strand along a drawing axis through an annular gap between an outer member and an inner member, which is arranged in a through hole of the outer member, of a drawing nozzle provided in the bottom area of the crucible. To improve the known method with respect to less inhomogeneity in the drawn-off tubular strand and thereby to permit the manufacture of homogeneous, defect-free hollow cylinders of quartz glass by drawing from the melt, it is suggested according to the invention that the inner member of the drawing nozzle, viewed in the direction of the drawing axis, is held suspended and radially movable inside the through hole of the outer member, and that the annular gap of the drawing nozzle has a longitudinal section 'L' in which its cross-sectional nozzle area is reduced in size from the top to the bottom.

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