Patent ID: 11905657
Assignee: DAIO PAPER CORPORATION
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC D  C | IPC C  D

Claim 0:
1. A method for producing cellulose nanofibers, the method comprising:
pretreating pulp fibers in a slurry; and
refining, using a high-pressure homogenizer, the pulp fibers in the slurry, the pulp fibers being pretreated,
wherein
as the pretreating, the pulp fibers are coarsely fibrillated, using a refiner apparatus, without being chemically treated,
a fines content of the pulp fibers which are subjected to the pretreating and are to be subjected to the refining is 50% or more, and
a weight average molecular weight of cellulose of cellulose nanofibers obtained through the refining is 65% or more of a weight average molecular weight of cellulose of the pulp fibers before the pretreating.