Chemical wood pulp with enhanced tensile strength

A method for production of chemical wood pulp, wherein the method comprises:

• a) providing wood pulp;
• b) providing xylan-rich fiber material, the xylan-rich fiber material being priorly delignified to a kappa number less than 50;
• c) mixing the xylan-rich fiber material containing at least 15% xylan with an alkaline solution thus forming a xylan-rich alkaline slurry containing fibers, alkali and dissolved xylan;
• d) adding the xylan-rich alkaline slurry containing fibers, alkali and dissolved xylan to the wood pulp thus providing a pulp mixture,
• wherein the step d) is followed by at least one of:
• e) oxygen delignification step and/or,
• f) alkaline bleaching step,
• thereby reusing the alkali in the xylan-rich alkaline slurry from step c) in step e) and/or step f).