Machine glazed paper and method for preparing the machine glazed paper

Abstract

The present disclosure relates to a machine glazed paper comprising softwood fibers, the machine glazed paper comprising starch to an amount within the range of from 0.1 wt. % by weight to 2 wt. % of the dry weight of the machine glazed paper. the amount of softwood fibers of the total amount of fibers being 63 wt. % or more, and the machine glazed paper having a Cobb value within the range of from 20 gsm to 50 gsm. as measured according to the standard method ISO 535:2014. The present disclosure furthermore relates to a method of producing the machine glazed paper.

1 . A machine glazed paper comprising softwood fibers, the machine glazed paper comprising starch to an amount within the range of from 0.1 wt. % by weight to 2 wt. % of the dry weight of the machine glazed paper, an amount of softwood fibers of the total amount of fibers being 63 wt. % or more, and the machine glazed paper having a Cobb value within the range of from 20 gsm to 50 gsm, as measured according to the standard method ISO 535:2014. 
     
     
         2 . The machine glazed paper according to  claim 1 , wherein the machine glazed paper comprises 4 wt. % or less of fillers, based on the total weight of the paper. 
     
     
         3 . The machine glazed paper according to  claim 1 , wherein 65 wt. % or more of the fibers in the machine glazed paper are softwood fibers. 
     
     
         4 . The machine glazed paper according to  claim 1 , wherein from 95 wt. % to 100 wt. % by weight of the of the fibers in the machine glazed paper are softwood fibers, preferably 100 wt % of the fibers in the machine glazed paper are softwood fibers. 
     
     
         5 . The machine glazed paper according to  claim 1 , wherein the machine glazed paper sizing agents in the paper are present a level of below 0.9 wt. %. 
     
     
         6 . The machine glazed paper according to  claim 1 , wherein the machine glazed paper has a basis weight within the range of from 35 gsm to 100 gsm. 
     
     
         7 . The machine glazed paper according to  claim 1 , wherein the machine glazed paper has an CD/MD stretch ratio of 0.5 or higher. 
     
     
         8 . The machine glazed paper according to  claim 1 , wherein the machine glazed paper has a MD stretch of from 0.5% to 2%, as measured according to the standard method ISO 1924/3. 
     
     
         9 . The machine glazed paper according to  claim 1 , wherein the machine glazed paper has a CD stretch of from 1.5% to 6.5%, as measured according to the standard method ISO 1924/3. 
     
     
         10 . The machine glazed paper according to  claim 1 , wherein the machine glazed paper has a first side and a second side, the second side having roughness of from 1000 ml/min to 2500 ml/min. 
     
     
         11 . The machine glazed paper according to  claim 1 , wherein the machine glazed paper has a first side and a second side, the first side being the glazed side and having a roughness of from 100 ml/min to 400 ml/min. 
     
     
         12 . The machine glazed paper according to  claim 1 , wherein the machine glazed paper has an air resistance within the range of from 15 to 35 s, as measured according to the standard method ISO 5636 “Paper and board—Determination of air permeance (medium range)—Part 5: Gurley method. 
     
     
         13 . The machine glazed paper according to  claim 1 , wherein the machine glazed paper is for use in a paper stick. 
     
     
         14 . (canceled) 
     
     
         15 . A paper stick, comprising or consisting of the machine glazed paper according to  claim 1 . 
     
     
         16 . A method for producing the machine glazed paper according to  claim 1 , the method comprising the steps of;
 providing a suspension comprising softwood fibers and starch, the starch being in an amount within the range of from 0.1 wt. % to 2 wt. % based on total dry weight and the amount of softwood fibers of the total amount of fibers in the suspension being 63 wt. % or more;   forming a fibrous web of the suspension;   dewatering of the fibrous web;   glazing the dewatered fibrous web in a glazing unit on a first side thereof and thereby forming the machine glazed paper, the machine glazed paper having a Cobb value within the range of from 20 gsm to 50 gsm, as measured according to the standard method ISO 535:2014.   
     
     
         17 . The method according to  claim 16 , wherein the method comprises a pre-drying step, between the dewatering step and the glazing step, wherein the fibrous web is pre-dried in the pre-drying step to have a moisture content within the ranger of from 40 to 60 wt. %. 
     
     
         18 . The method for producing the machine glazed paper according to  claim 15 , wherein the softwood fibers of the suspension are unbleached softwood fibers. 
     
     
         19 . The machine glazed paper according to  claim 2 , wherein the machine glazed paper is free from fillers. 
     
     
         20 . The machine glazed paper according to  claim 1 , wherein the paper is free from Alkylketen Dimer (AKD) and Alkenyl Succinic Anhydride (ASA).