What is the reason why kraft paper bags are more “hard”?

Kraft paper bags are stronger than plain paper. This is mainly because the wood fiber used for making kraft paper is relatively long, and when cooking wood, it is treated with a cooking agent such as caustic soda (sodium hydroxide) and sodium sulfide. The chemical action they exert is relatively mild, and the original strength of the wood fiber is less damaged. Therefore, the paper made from the pulp is closely related to the fiber and the fiber, and the paper strength is naturally high. So the kraft paper is very strong. Why is it stronger than plain paper? What is the secret of its manufacturing method?

In fact, when it comes to the initial birth, kraft paper is really made of the real calf skin. Now this kind of "kraft paper" will only be used when it is used as a drumhead. And the kraft paper we usually refer to, the wood fiber is usually derived from conifers. Coniferous trees are mostly evergreen trees. The raw materials are generally soft, some are rich in resin, so they are also called soft materials. There are Korean pine, Pinus sylvestris, Larch, spruce, fir, hemlock, Chinese fir, Baiben, Yunnan. Pine, Pinus armandi, Pinus massoniana and other conifer species. People first use chemical methods to make pulp, then put them into the beater for beating, participate in rubber, dyes, etc., and finally copy them into paper in the paper machine. Because the color of this paper is yellowish brown, the paper is tough, much like cowhide, so people call it kraft paper.

From the point of view of manufacturing methods, kraft paper is not much different from plain paper. The reason why kraft paper is stronger than plain paper is that the wood fiber used for making kraft paper is relatively long, and when cooking wood, it is treated with a cooking agent such as caustic soda (sodium hydroxide) and sodium sulfide. The chemical action they exert is relatively mild, and the original strength of the wood fiber is less damaged. Therefore, the paper made from the pulp is closely related to the fiber and the fiber, and the paper strength is naturally high. So the kraft paper is very strong.

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