The pore structure of Coated Duplex Board With Grey Back

The pore structure of Coated Duplex Board With Grey Back mainly includes the void ratio of the paper. The void ratio of the paper represents the ratio of the air volume within the paper to the volume of the paper. The void ratio of the paper can be obtained through calculation methods and experimental determination methods. The void ratio of white board paper = the volume of air in the paper (per unit area)/ the volume of the paper (per unit area)x100%. From the above equation, it can be seen that the larger the volume of air in the white board paper, the higher the void ratio of the white board paper. This also verifies the condition of the pore structure of the white board paper. The fewer the paper fibers and the sparser the interweaving, the larger the voids between the fibers. The pore structure of white board paper is worse. On the contrary, the more fibers a paper has and the denser the interweaving, the smaller the gaps between the fibers will be, and the better the pore structure of the white board paper will be. The solidification and drying of ink on the paper surface accelerate with the increase of porosity, and its ink absorbency also increases. However, the gloss of the ink trace on the paper surface decreases with the increase of porosity.