Paper products and pulps with surface enhanced pulp fibers and increased absorbency, and methods of making same
Paper products such as tissues can be made using a furnish comprising surface enhanced pulp fibers (“SEPF”). In some embodiments, SEPF have a weighted average fiber length of at least 0.3 millimeters (mm) and an average hydrodynamic specific surface area of at least 10 square meters per gram (m 2 /g). In some embodiments, a furnish or a paper product can comprise at least 2% SEPF by dry weight. In some embodiments, a paper product comprising SEPF can be formed from a furnish having a freeness of 650 ml Canadian Standard Freeness (CSF) or less, optionally 600 ml CSF or less.
1. A tissue comprising a plurality of surface enhanced pulp fibers and a plurality of softwood fibers, wherein:
the tissue comprises at least 2% surface enhanced pulp fibers by weight;
the surface enhanced pulp fibers have a length weighted average fiber length of at least 0.3 millimeters (mm) and an average hydrodynamic specific surface area of at least 10 square meters per gram (m 2 /g); and
the tissue is formed from a furnish having a freeness of 650 milliliters of Canadian Standard Freeness (mL CSF) or less, the furnish generated by co-refining the surface enhanced pulp fibers and softwood fibers.
2. The tissue of claim 1 , wherein the furnish comprises 11% to 25% surface enhanced pulp fibers by dry weight of fiber in the furnish.
3. The tissue of claim 1 , wherein the Absorption Index of the tissue is at least 25%.
4. The tissue of claim 1 , wherein the tissue has a grammage between 20 grams per square meter (g/m 2 ) and 45 g/m 2 .
5. The tissue of claim 1 , wherein the tissue comprises between 5% and 25% surface enhanced pulp fibers by weight.
6. The tissue of claim 1 , wherein the tissue is formed from a furnish having a freeness of 600 ml CSF or less.
7. The tissue of claim 6 , wherein the tissue is formed from a furnish having a freeness between 550 ml CSF and 600 ml CSF.
8. The tissue of claim 6 , wherein the softwood fibers comprise Northern bleached softwood kraft fibers.
9. The tissue of claim 1 , wherein the surface enhanced pulp fibers originated from softwood fibers.