Sack kraft paper, or just
sack paper, is a porous kraft paper with high
elasticity and high tear resistance, designed for packaging products with high demands for strength and durability.
[2] Pulp produced by the kraft process is stronger than that made by other
pulping processes; acidic
sulfite processes 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
hydrophobic nature of lignin interferes with the formation of the
hydrogen bonds between cellulose (and hemicellulose) in the fibers.
[3] 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.
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