公开(公告)号：US20230114823A1

公开(公告)日：2023-04-13

申请号：US17911325

申请日：2021-03-16

Applicant: NITTO DENKO CORPORATION

Inventor： Kenjiro SAOMOTO ,  Tatsuya ARAKI ,  Yuki FUJIWARA ,  Hajime MICHIHIRA

IPC: C03C25/16 ,  C03C25/106

Abstract: A method for producing a coated optical fiber includes coating, using a coating die, a circumferential side surface of an optical fiber with a coating material by passing the optical fiber sequentially through an insertion hole portion, a_ liquid retaining chamber (21), and a_coating hole portion opposed to the insertion hole portion, while the coating material in the liquid retaining chamber is supplied under pressure to the coating hole portion, in which a pressure difference ΔP (MPa) between a liquid pressure of the coating material in the liquid retaining chamber and a pressure outside the coating die, a viscosity µ (Pa·s) of the coating material in the liquid retaining chamber, and a length L (mm) of the coating hole portion in an extending direction satisfy a relationship of ΔP/µL ≤ 0.15.

公开(公告)号：US20230137341A1

公开(公告)日：2023-05-04

申请号：US17911332

申请日：2021-03-16

Applicant: NITTO DENKO CORPORATION

Inventor： Kenjiro SAOMOTO ,  Tatsuya ARAKI ,  Yuki FUJIWARA

IPC: B29D11/00

Abstract: A method for producing a coated optical fiber uses a coating die including a liquid retaining chamber; an insertion hole portion that communicates with the liquid retaining chamber; and a coating hole portion that communicates with the liquid retaining chamber and that is opposed to the insertion hole portion via the liquid retaining chamber. The production method includes, in the coating die, coating a circumferential side surface of an optical fiber with a coating material by passing the optical fiber through the insertion hole portion, the liquid retaining chamber, and the coating hole portion while the coating material in the liquid retaining chamber is supplied to the coating hole portion, in which a viscosity μ (Pa·s) of the coating material in the liquid retaining chamber, and a length L (mm) of the coating hole portion in an extending direction satisfy a relationship of μL≥1.5.