The pressure-sensitive adhesive having a high viscosity and some flexibility of polymer material, such as acrylic polymers, rubber, silicone rubber or the like. Adhesive tape is a rigorous physical process is divided into two steps infiltration and adhesions, and the viscoelastic polymer. Here played an important role: first, tacky adhesive having certain properties of the liquid and the surface energy of the molecule and the binder is low, which makes the binder can easily infiltrate the surface, so that the resilient adhesive molecules, when pressed, can gather together and not pushed to one side; then, adhesion process is the result of the adhesive cohesion and adhesion of the role.