Many enterprises kraft paper will find a problem when the choose and buy, buy the same breed sometimes also can appear different shades of kraft paper and hardness, this situation is a lot of people can't understand, tend to think of the manufacturer to produce kraft paper quality levels not neat, or is that participation in the product quality of different paper to good filling and so on.
As we all know, the main raw material of kraft paper is plant fiber, among which the kraft paper made from coniferous wood fiber is the most common, because the content of plant fiber will affect the hardness of paper, the higher the fiber content, the higher the hardness of paper. In the process of papermaking, if you add rags, bark and other raw materials, it will improve the toughness of paper, so the fiber content of different varieties of trees are different, the fiber content of trees in different regions is also different, which leads to the production of kraft paper hardness is different.
As for cowhide paper chroma, the factors affecting it are more. From the perspective of raw materials, the colors of trees are different from each other, and different colors are produced according to the age of trees, seasons and regions. And in the process of papermaking temperature will also affect the color of paper. In addition, kraft paper in the manufacturing process will also have this process of dyeing, so in the dyeing process, the color proportion of the dye is different will lead to a certain color difference between kraft products.