Kraft Paper

Kraft paper is paper or paperboard produced from chemical pulp produced in the Kraft process.
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 hemicelluloses) 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.


•    Kraft paper (plastic hazard free) is used in paper sacks for cement, food, chemicals, consumer goods, flour bags etc.
•    Kraft paper is used for electrical insulation in large oil filled transformers.
•    Kraft papers are used in paper grocery bags, multiwall sacks, envelopes and other packaging.
•    Kraft paper is an inexpensive material for lining particle boards.
•    The base paper for sandpaper is normally Kraft paper.

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