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1. (WO2018101228) SEAL STRUCTURE FOR OPTICAL FIBER WIRE DRAWING OVEN AND OPTICAL FIBER PRODUCTION METHOD

Pub. No.:    WO/2018/101228    International Application No.:    PCT/JP2017/042500
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Wed Nov 29 00:59:59 CET 2017
IPC: C03B 37/027
G02B 6/02
Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD.
住友電気工業株式会社
Inventors: YOSHIKAWA, Satoshi
吉川 智
Title: SEAL STRUCTURE FOR OPTICAL FIBER WIRE DRAWING OVEN AND OPTICAL FIBER PRODUCTION METHOD
Abstract:
Provided are a seal structure for an optical fiber wire drawing oven allowing an optical fiber glass preform fitted with a cap member to be readily set in a wire drawing oven, and an optical fiber production method. The seal structure for the optical fiber wire drawing oven is for plugging a gap between an upper end open section of the optical fiber wire drawing oven, and the optical fiber glass preform wherein a seed rod and a taper portion are present in an upper portion thereof. The invention comprises a first cap member (30) engaging the seed rod of the glass preform; a second cap member (40) covering the taper portion of the glass preform and the first cap member; a spacer member (50) disposed between the first cap member and the second cap member, supporting the second cap member, and adjusting, via a positional adjustment structure, the height position of the second cap member in the axial direction, causing the lower extremity of the second cap member to be at a position close to the taper portion; and a seal member establishing a seal between the upper end open section and the glass preform and/or second cap member.