Kraft paper is paper or paperboard (cardboard) produced from chemical pulps produced in the kraft papers.Pulp produced by the kraft process is stronger than that made by other pulping processes; acidic degrade cellulose more, leading to weaker fibers, and mechanical pulping processes leave most of the lignin with the fibers, whereas kraft pulping removes most of the lignin present originally in the wood.
Low lignin is important to the resulting strength of the paper as the hydrocitic nature of lignin interferes with the formation of the hydrogen bonds between cellulose (and hemicellulose) in the fibers.
Kraft pulp is darker than other wood pulps, but it can be bleached to make very white pulp. Fully bleached kraft pulp is used to make high quality paper where strength, whiteness and resistance to yellowing are important.
640/400 img size then new file 1200/450.