Recyclable paper of high wet strength

Abstract

There is provided a paper for use in a medical device package, said paper comprising polyamino amide epichlorohydrin (PAE) resin, glyoxylated polyacrylamide (G-PAM) and starch, wherein the amount of PAE resin is 0.15-1.75 kg/tonne dry paper and the amount of starch is 1-3 kg/tonne dry paper of and wherein the paper has a grammage measured according to ISO 536:2019 of 30-120 g/m2 and an air resistance measured according to ISO 5636-5:2013 below 37 s.

1 . A medical device package paper, said paper comprising polyamino amide epichlorohydrin (PAE) resin, glyoxylated polyacrylamide (G-PAM) and starch, wherein the amount of PAE resin is 0.15-1.75 kg/tonne dry paper and the amount of starch is 1-3 kg/tonne dry paper of and wherein the paper has a grammage measured according to ISO 536:2019 of 30-120 g/m 2  and an air resistance measured according to ISO 5636-5:2013 below 37 s. 
     
     
         2 . The paper of  claim 1 , wherein the amount of G-PAM is 0.5-6.0 kg/tonne dry paper. 
     
     
         3 . The paper of  claim 1 , wherein the amount of PAE resin is 0.25-1.50 kg/tonne dry paper. 
     
     
         4 . The paper of  claim 1 , wherein said G-PAM is cationic G-PAM. 
     
     
         5 . The paper of  claim 1 , which is a kraft paper, such as a machine glazed (MG) kraft paper. 
     
     
         6 . The paper of  claim 1 , which is bleached. 
     
     
         7 . The paper of  claim 1 , wherein the grammage measured according to ISO 536:2019 is 30-50 g/m 2 . 
     
     
         8 . The paper of  claim 1 , wherein the density measured according to ISO 534:2011 is at least 600 kg/m 3 . 
     
     
         9 . The paper of  claim 1 , wherein the Cobb 60 s value measured according to ISO 535:2014 of at least one side of the paper is below 40 g/m 2 . 
     
     
         10 . The paper of  claim 1 , wherein the geometrical tensile index measured according to ISO 1924-3:2005 is at least 50 Nm/g. 
     
     
         11 . The paper of  claim 1 , wherein the geometrical wet tensile index measured according to ISO 1924-3:2005 is at least 10 Nm/g. 
     
     
         12 . The paper of  claim 1 , which is formed from a softwood pulp. 
     
     
         13 . The paper of  claim 1 , wherein at least 75% by dry weight of the fibers of the paper are virgin fibers. 
     
     
         14 . A medical device package comprising a paper according to  claim 1 . 
     
     
         15 . The paper of  claim 1 , which is formed from a mixture of a softwood pulp and a hardwood pulp. 
     
     
         16 . The paper of  claim 1 , wherein at least 90% by dry weight of the fibers of the paper are virgin fibers.