公开(公告)号：SE546815C2

公开(公告)日：2025-02-25

申请号：SE2151330

申请日：2021-10-29

Applicant: STORA ENSO OYJ

Inventor： LJUNGQVIST CARL-HENRIK ,  BACKFOLK KAJ ,  TOLLNERIUS LENA

IPC: D21B1/32 ,  B32B27/10 ,  D21B1/02

Abstract: The present invention relates to a method for manufacturing a purified fiber fraction from used beverage carton (UBC), said method comprising the steps:a) subjecting UBC starting material to a polymer and aluminum film separation method to obtain a UBC polymer and aluminum fraction and a raw UBC fiber fraction;b) optionally subjecting the raw UBC fiber fraction to a coarse screening method to remove coarse particles;c) subjecting the raw UBC fiber fraction to a fine screening method to remove cellulose fines and fine particulate contaminants, wherein the fine screening method comprises at least one fine screening step and at least one washing step; d) optionally subjecting the fine screened UBC fiber fraction to a washing method to remove further contaminants;e) optionally subjecting the fine screened UBC fiber fraction to a bleaching method;f) subjecting the fine screened, and optionally bleached, UBC fiber fraction to a dewatering method to a consistency of at least 20 wt%; andg) subjecting the dewatered UBC fiber fraction to deactivation to obtain a purified UBC fiber fraction.