公开(公告)号：US11077648B2

公开(公告)日：2021-08-03

申请号：US16087281

申请日：2017-03-21

Applicant: Stora Enso OYJ

Inventor： Isto Heiskanen ,  Seppo Lampainen ,  Jukka Kankkunen

IPC: B32B29/08 ,  D21H27/10 ,  D21H27/38 ,  D21H27/40 ,  D21H11/18 ,  D21H17/25 ,  D21H21/16 ,  D21H21/18 ,  D21H17/16 ,  D21H17/17 ,  D21H17/62 ,  B65D65/40 ,  B32B29/00

Abstract: A corrugated fiberboard comprising cellulosic fibers, wherein said corrugated fiberboard has at least one of a geometrical tensile index in the range of from 32 to 65 Nm/g, a fracture toughness index in the range of from 4 to 24 Jm/kg, and a ring crush index in the range of from 5 to 10 Nm/g5 measured at relative humidity of 85% RH; wherein the cellulosic fibers comprises a mixture of less refined fibers having a Schopper-Riegler (SR) value in the range of 15 to 28 and microfibrillated cellulose fibers, wherein mixture comprises said microfibrillated cellulose in a range of from 1% to 5% by weight of the dry content of the cellulosic fibers.