Use of kraft paper
Kraft paper has a high tension, with single light, double light, stripe, no grain and so on. Kraft paper is mainly used for packing paper, envelope, paper bag and printing machine drum lining. Used as packing material. It's very strong. It is usually yellowish brown. The kraft pulp is light brown, cream or white. The quantitation was 80-120 g / m2. The fracture length is generally more than 6000m. The tear strength, work of rupture and dynamic strength are very high. Most of them are web paper, but there are also flat paper. Kraft softwood pulp is used as raw material, which is beaten and made on a long wire machine. It can be used as cement bag paper, envelope paper, adhesive sealing paper, asphalt paper, cable protection paper, insulation paper, etc.
Long ago, kraft paper was really made of calf skin. This kind of "kraft paper" is introduced by the manufacturers of sealing bags with eight sides. Now it is only used when making drum skin. The kraft paper used for book wrapping is that after people have learned the papermaking technology, the kraft paper is made by chemical method with the wood fiber of coniferous tree, and then it is put into the beating machine for pulping, and then the glue and dye are added, and finally the paper is made in the paper machine. Because the color of this paper is yellowish brown, the paper is tough and looks like cowhide, so people call it kraft paper.
In fact, the manufacturing method of kraft paper and ordinary paper introduced by the manufacturer of octahedral bag is not much different. Why is kraft paper stronger than plain paper? This is mainly because the wood fiber used in kraft paper is relatively long, and when cooking wood, it is treated with caustic soda and alkali sulfide chemicals. In this way, their chemical effect is relatively mild, and the damage to the original strength of wood fiber is relatively small. Therefore, the paper made of this kind of pulp is closely related to the fiber, so kraft paper is very important Prison. http://www.dgbpk.com/