The structure of Tactile Paper

Base paper layer: Located at the bottom layer of the touch paper, it serves as the carrier for all other functional layers. It is usually made from high-quality wood pulp, with a weight generally ranging from 20 to 68g/m², tensile strength between 1.2 and 3.5KN/m ², elongation at break between 1.4 and 2.5%, surface smoothness between 4500 and 8950s, and surface free energy between 56.5 and 82.3mJ/m².

Anti-seepage barrier layer: Coated on the base paper layer, with a thickness ranging from 1.2 to 23.1μm. Its function is to prevent subsequent coatings or inks from penetrating into the base paper, while enhancing the flatness and surface performance of the paper. The anti-permeability of the paper reaches level 4-5, the bending strength is between 105.05 and 122.09MPa, and the surface smoothness is between 8100 and 22000s. The surface free energy is between 48.1 and 70.6mJ/m².

Tactile coating layer: This is the key layer that gives the paper a special tactile feel, located above the anti-seepage barrier layer, with a thickness ranging from 15.7 to 60.4μm. The materials used in this layer have specific bending strength, bending modulus, coating porosity, shrinkage rate, elastic modulus and plasticity index, etc. By adjusting these parameters, the paper can present different tactile sensations, such as velve-like and silky sensations.