Process for fabricating silica tube with low bow

• Main Authors: MONBERG ERIC M, WALZ FREDERICK W. JR
• Format: Patent
• Language: English; Korean
• Published: 07.07.2001
• Edition: 7
• Subjects: CHEMISTRY; GLASS; MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES; METALLURGY; MINERAL OR SLAG WOOL

PURPOSE: A method for preparing a silica tube is provided, to obtain a ceramic tube such as a silica overcladding tube having a very little bow of about 0.3 mm per meter or less. CONSTITUTION: The method comprises the steps of inserting a handle front end(22) into the internal cavity of a tube(10); inserting a silica pin(30) therein; fixing the relative terminal of a handle by a knob(40), to allow the tube to be perpendicularly hung down; keeping the tube/handle assembly parts at a temperature suitable for removing all of the remaining impurities; raising the temperature of the assembly parts by passing the parts through the hot region of a furnace, to allow the entire part of the tube to be fired and the furnace to be heated generally to a sintering temperature; and passing the tube through the hot region and returning it by pulling up. The handle front end(22) and the tube(10) are deformed by a high temperature but the handle front end(22) is applied with force and has a tendency to be deformed in the array symmetrically perpendicularly to the tube which maintains perpendicularity by the occurrence of the bow. 본 발명은 미터당 약 0.3 mm 또는 그 이하의 매우 작은 보우를 가진 세라믹 튜브, 즉 실리카 오버 클래딩 튜브를 제조하는 방법에 관한 것이다. 특히, 본 발명은 처리 중에 튜브를 수직인 상태로 현수하고, 또한 이와 같은 열 처리 중에 이 수직 상태의 구조를 유지하도록 변형이 가능한 핸들에 의해서 튜브를 고정하는 방법에 관한 것이다.