US2022213649A1PendingUtilityA1

Efficient production of a containerboard to be used as fluting

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Assignee: BILLERUDKORSNAS ABPriority: May 14, 2019Filed: May 14, 2020Published: Jul 7, 2022
Est. expiryMay 14, 2039(~12.8 yrs left)· nominal 20-yr term from priority
Inventors:Fredrik NordströmJohan KullanderMikael Karpathakis
D21F 3/0227D21H 27/10D21F 1/02D21F 3/0218D21F 11/00D21H 11/00
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Claims

Abstract

There is provided a method of producing a containerboard having a geometric SCT index of 37.0-42.0 Nm/g when measured according to ISO 9895:2008, comprising the steps of: —providing a pulp having a Schopper-Riegler (SR) value of 15-19 when measured according to ISO 5267-1:1999, wherein at least 70% by dry weight of the pulp is NSSC pulp; —forming a web from the pulp; —pressing the web in a press section comprising a shoe press, wherein the shoe press comprises a shoe press belt having discontinuous grooves and the line load in the shoe press is in the range of 1400-2000 kN/m; —drying the web from the press section in a drying section to obtain said containerboard.

Claims

exact text as granted — not AI-modified
1 . A method of producing a containerboard having a geometric SCT index of 37.0-42.0 Nm/g when measured according to ISO 9895:2008, comprising the steps of:
 providing a pulp having a Schopper-Riegler (SR) value of 15-19 when measured according to ISO 5267-1:1999, wherein at least 70% by dry weight of the pulp is NSSC pulp;   forming a web from the pulp;   pressing the web in a press section comprising a shoe press, wherein the shoe press comprises a shoe press belt having discontinuous grooves and the line load in the shoe press is in the range of 1400-2000 kN/m;   drying the web from the press section in a drying section to obtain said containerboard.   
     
     
         2 . The method according to  claim 1 , wherein the web is subjected to a press impulse of 105-190 kPa*s in the shoe press. 
     
     
         3 . The method according to  claim 1 , wherein the speed of the web is in the range of 700-850 m/min. 
     
     
         4 . The method according to  claim 1 , wherein grammage of the containerboard is in the range of 120-240 g/m 2 , when measured according to ISO 536:2012. 
     
     
         5 . The method according to  claim 1 , wherein line load in the shoe press is in the range of 1500-2000 kN/m. 
     
     
         6 . The method according to  claim 1 , wherein at least 80% by dry weight of the pulp is NSSC pulp. 
     
     
         7 . The method according to  claim 1 , wherein at least 88% by dry weight of the pulp is NSSC pulp. 
     
     
         8 . The method according to  claim 1 , wherein the yield of the NSSC pulp is 75-85% 
     
     
         9 . The method according to  claim 1 , wherein the containerboard has a geometric SCT index of 38.0-42.0 Nm. 
     
     
         10 . The method according to any  claim 1 , wherein at least 70% by dry weight of the NSSC pulp is hardwood NSSC pulp. 
     
     
         11 . The method according to  claim 1 , wherein at least 80% by dry weight of the NSSC pulp is hardwood NSSC pulp 
     
     
         12 . The method according to  claim 1 , wherein the steam consumption in the drying section is in the range of 1.20-1.35 ton steam per ton paper. 
     
     
         13 . The method according to  claim 1 , wherein the press section comprises another press arranged upstream the shoe press. 
     
     
         14 . The method according to  claim 1 , wherein the consistency of the pulp in a head box used for forming the web is 0.50%-1.20%. 
     
     
         15 . The method according to  claim 10 , wherein the consistency of the pulp in a head box used for forming the web is 0.80%-1.20%. 
     
     
         16 . The method of  claim 10 , wherein the hardwood NSSC pulp is birch NSSC pulp. 
     
     
         17 . The method of  claim 13 , wherein the press arranged upstream of the shoe press is a jumbo press. 
     
     
         18 . The method according to  claim 5 , wherein line load in the shoe press is in the range of 1600-2000 kN/m. 
     
     
         19 . The method according to  claim 8 , wherein the yield of the NSSC pulp is 79-85%. 
     
     
         20 . The method according to  claim 9 , wherein the containerboard has a geometric SCT index of 39.0-42.0.

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