Kraft paper has a high tensile force, including single light, double light, stripes, and non-texture. Mainly used for packaging paper, envelopes, paper bags, etc. and printing machine drum liners. Used as packaging material. High intensity. Usually yellow-brown. Semi- or fully-bleached kraft pulp is light brown, cream or white. The basis weight is 80 ～ 120g / m2. The fracture length is generally above 6000m. The tear strength, work of rupture and dynamic strength are very high. Most are roll paper, but also flat paper. Sulfate coniferous pulp is used as raw material, after beating, it is copied on a Fourdrinier paper machine. It can be used as cement bag paper, envelope paper, adhesive paper, asphalt paper, cable protective paper, insulation paper, etc.
The manufacturing method of kraft paper is not much different from that of ordinary paper. Why is kraft paper stronger than plain paper? This is mainly because the wood fibers used in making kraft paper are relatively long, and when cooking wood, they are treated with fire alkali and sulfide alkali chemicals, so that their chemical role is relatively mild, and the original strength of the wood fiber is affected. The damage is relatively small, so the paper made from this pulp is closely related to the fiber, so the kraft paper is very strong.
Kraft paper is made of coniferous wood fibers. After chemical pulping, it is put into a beater for beating, and then rubber, dyes, etc. are added. Finally, it is copied into paper in a paper machine. Because the color of this paper is tan, and the paper is tough, much like kraft, it is called kraft paper. It feels more comfortable, and it's better in its packaging.