Wet-pressed paper trays are a very common package in the market. Currently, white wet-pressed paper trays are more commonly used. However, white paper trays on the market vary greatly in whiteness. How to handle wet-pressed trays to make them appear whiter?
Due to the yellow to off-white properties of pulp fibers, it is difficult to appear pure white even by bleaching, which leads to the fact that although there are many white wet-pressed paper tray products on the market, due to differences in raw materials and processing techniques, the There is also a big difference in whiteness.
At present, in the whitening method of wet-pressed paper trays, it is more common to choose to add dyes such as royal blue and lake blue to the pulp, and through dyeing and toning to make it appear relatively pure white, this method is called whitening. For pulp with higher whiteness, we will use some fluorescent whitening agents to increase the brightness of white, which can also make the wet-pressed paper holder white.
In addition to creating a brighter white paper tray, it can also customize different colors on demand. By adding water-based dyes on the basis of the original pulp, it can provide customers with a variety of wet-pressed paper tray products.
