The white cardboard is thick and hard and has a large quantity.
Quantitative specifications include 200g/m2, 220g/m2, 250g/m2, 270g/m2, 300g/m2, 400g/m2 and other specifications.
The density of white cardboard is generally not less than 0. 80g/m3, requiring high whiteness.
The whiteness of A, B and C is not less than 92. 0%, 87. 0% and 82. 0% respectively.
In order to keep the paper products smooth, the white cardboard should be thick, strong, firm, high hardness and crack-resistant.
Different grades of paper have different requirements for different quantitative hardnesses.
White cardboard usually requires 100% bleached wood pulp as raw material. The surface layer and bottom layer use sulfate chemical softwood pulp, and the core layer uses hardwood chemical mechanical pulp. After beating, calcium carbonate, barium sulfate, etc. are added, such as packaging, using AKD
It is sizing and processed with the mesh layer of paper pulp manufacturing paper stacking machine. According to needs, cardboard with special relief patterns can be produced through relief processing. All white cardboard with special relief patterns does not need to be checked for smoothness and whiteness.
In addition to white, we can also produce cardboard in various colors by dyeing the slurry.
At this time, except for whiteness, other technical properties are consistent with those of white cardboard.
