公开(公告)号：US20240375336A1

公开(公告)日：2024-11-14

申请号：US18580699

申请日：2022-07-20

Applicant: NITTO DENKO CORPORATION

Inventor： Tatsuya Araki ,  Kenichiro Nishiwaki ,  Sho Irie ,  Yasuharu Imamura

IPC: B29C48/21 ,  B29C48/05 ,  B29C48/285 ,  B29L11/00

Abstract: A method is disclosed for manufacturing a plastic optical fiber composed of a plurality of layers including a core and a cladding, which includes forming at least one layer formed of the plurality of layers by melt extrusion molding of a material resin using a melt extrusion unit including an extrusion screw, wherein a pellet of the material resin is fed to the melt extrusion unit, and a relation expressed by the following inequality (I) is satisfied by a flight height Hf (mm) of the extrusion screw in a feed zone Lf of the melt extrusion unit and a maximum dimension Lmax (mm) of the pellet to be fed: 0≤Hf−Lmax≤3 (I); and a volume V (mm3) of the pellet satisfies the following inequality (II): 4

公开(公告)号：US20230226737A1

公开(公告)日：2023-07-20

申请号：US17928507

申请日：2021-05-28

Applicant: NITTO DENKO CORPORATION

Inventor： Kenjiro Saomoto ,  Shinsuke Sugiura ,  Yasuaki Okada ,  Sho Irie

IPC: B29C48/29 ,  B29C48/00 ,  B29C43/32 ,  B29C43/36

CPC classification number: B29C48/29 ,  B29C43/32 ,  B29C43/36 ,  B29C48/022 ,  B29C2043/3205 ,  B29C2043/3233 ,  B29K2096/00

Abstract: An optical resin formed body manufacturing method includes: (i) depressurizing an inside of a container holding a molten optical resin; (ii) pressurizing the inside of the container holding the molten optical resin; and (iii) shaping the optical resin taken out of the container into a given shape. The steps (i) and (ii) are sequentially performed once each or are alternately performed two or more times each. In the step (i), a duration t1 [min] of the depressurization of the inside of the container is set such that the duration t1 and a viscosity µ1 [Pa•s] of the molten optical resin satisfy a relation µ1/t1