1, Used to alter the surface properties of face capable person. Such as improving surface tension, change color, add protective etc 2 make it better accept inks and easy to print, to prevent smudgy, printing ink cohesiveness and prevent increase fall. 3 The purpose of pictures Mainly used for the surface coating materials such as aluminum foil absorbency, aluminum paper and various film materials 4 Namely surface materials is positive accept printing graphic, back to accept adhesives and eventually applied to be paste the thing on materials.