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1. (WO2018140393) OPTICAL FIBER COATING DIE WITH REDUCED WETTED LENGTH

Pub. No.:    WO/2018/140393    International Application No.:    PCT/US2018/014834
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Wed Jan 24 00:59:59 CET 2018
IPC: C03C 25/18
Applicants: CORNING INCORPORATED
Inventors: DE, Sumitava
MOORE, Robert Clark
NEILSON, Douglas Gregg
TANDON, Pushkar
Title: OPTICAL FIBER COATING DIE WITH REDUCED WETTED LENGTH
Abstract:
An optical fiber coating apparatus includes a cone-only coating die having a conical entrance portion with a tapered wall with half angle α, 2° ≤ α ≤ 25°, and a cone height L1 less than 2.2 mm, and a cylindrical portion having an inner diameter d2, 0.1 mm ≤ d2 ≤ 0.5 mm and a cylindrical height L2, 0.05 mm ≤ L2 ≤ 1.25 mm; a guide die, the guide die disposed adjacent the cone-only coating die such that a wetted length (L5) between the exit of the guide die and the entrance of the cone-only coating die is from 1 mm to 5 mm; and a holder for holding the cone-only coating die and the guide die in a fixed relationship defining a coating chamber with inner radius L6 from the optical fiber axis to an inner wall of the holder from 3 mm to 10 mm.