Title:
大型の石英ガラス管の製造法
Document Type and Number:
Japanese Patent JP6478990
Kind Code:
B2
Abstract:
A method for producing a large quartz-glass pipe is provided. In a first forming step, an intermediate cylinder made of quartz glass and having an intermediate-cylinder wall thickness and outside diameter is formed by using a forming tool and is then cooled. In a second shaping step, at least one length segment of the cooled intermediate cylinder is fed to a heating zone, heated to a softening temperature zone by zone therein, and, while rotating about the longitudinal axis of the intermediate cylinder, shaped into the large quartz-glass pipe having a final wall thickness and outside diameter. The quartz glass is synthetically produced and has an average hydroxyl group content of 10 ppm by weight or less. If the intermediate cylinder is divided into length segments of 1 cm, adjacent length segments have a difference of less than 2 ppm by weight in the average hydroxyl group content thereof.
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Inventors:
Boris Grauman
Buak Heart Obere
Christian Schenck
Gero Fisher
Pellasy Declark
Bearn Heart Franz
Ulrich line
Alexander Rats
Ahim Hoffman
Buak Heart Obere
Christian Schenck
Gero Fisher
Pellasy Declark
Bearn Heart Franz
Ulrich line
Alexander Rats
Ahim Hoffman
Application Number:
JP2016524788A
Publication Date:
March 06, 2019
Filing Date:
July 08, 2014
Export Citation:
Assignee:
Heraeus Quarzglas GmbH & Co. KG
International Classes:
C03B23/057; C03B20/00; C03B23/043; C03B23/045
Domestic Patent References:
| JP2009149506A | ||||
| JP8026758A | ||||
| JP2005272250A | ||||
| JP2001151523A | ||||
| JP20081586A | ||||
| JP2004345903A | ||||
| JP2010168244A | ||||
| JP4026522A | ||||
| JP2006520738A | ||||
| JP2005507358A | ||||
| JP2006335577A |
Attorney, Agent or Firm:
Einzel Felix-Reinhard
Junichi Maekawa
Hiroyasu Ninomiya
Ueshima
Junichi Maekawa
Hiroyasu Ninomiya
Ueshima