公开(公告)号：US20210108367A1

公开(公告)日：2021-04-15

申请号：US17067542

申请日：2020-10-09

Applicant: Valmet Technologies Oy

Inventor： Ramon Muñoz

IPC: D21D1/26

Abstract: A refiner for refining lignocellulose containing fiber material has two substantially oppositely positioned refining elements (6, 6a, 6b, 9) with refining surfaces (8, 8a, 8b, 11, 11a, 11b) with blade bars (25, 27) and grooves (26, 28). Opposed refining surfaces face each other forming a refining chamber (15, 15a, 15b) which receives fiber material to be refined. The refiner has two feed channels (19a, 19b) for feeding into the refiner at least one fiber material fraction (FM1, FM2) to be refined, and two refining zones (21a, 21b) with at least one different refining surface characteristic between the refining zones (21a, 21b). Each refining zone (21a, 21b) is intended to refine one fiber material fraction (FM1, FM2) of the at least one fiber material fraction (FM1, FM2). There is at least one discharge channel (23, 23a, 23b) for discharging out of the refiner at least one flow of refined material.