White kraft paper has always been a favorite paper in the printing industry, with various printing styles and high-definition natural colors. Everyone knows that the whiter the white, the cleaner it feels. Therefore, many businesses deliberately pursue ultra-high whiteness to make the packaging look more beautiful. Then, the whiter the white kraft paper, the better?
White kraft paper can be divided into plain white kraft paper and high white kraft paper. They are distinguished according to the whiteness of the paper. The whiteness of high white kraft paper exceeds 90 degrees. To achieve higher whiteness, it is added to the paper production process. Fluorescent whitening agent, the fluorescent agent can excite incident light to produce fluorescence, so that the dyed material can obtain a sparkling effect similar to fluorite, making the material visible to the naked eye very white, achieving the whitening effect, so the high white kraft paper looks Very white and very clean.
However, fluorescent agents are not decomposed like other chemical elements. Long-term exposure will accumulate in the human body, destroy the human immune system, and even cause cell cancer. The food packaging industry prohibits the addition of excessive fluorescent whitening in the paper. Therefore, high white kraft paper cannot be used as food packaging paper.
The whiteness of the original white kraft paper is lower than that of the high white kraft paper, and it has a light wood pulp color. The original white kraft paper is made of pure wood pulp and does not contain fluorescent agents. It fully meets the requirements of food-grade packaging. It is a special paper for food packaging.
Therefore, white kraft paper is not as white as possible. It depends on the production requirements of the product. Food-grade kraft paper and non-food-grade kraft paper mainly depend on whether it contains the fluorescent whitening agent. It is recommended to use professional fluorescent agent detection tools for detection.