In speaking Label printing process at the same time, we must also look at the basic structure of self-adhesive materials as printed materials and functions of each part. Structural adhesive material on the surface is composed of three parts, namely, surface materials, adhesives and the end of paper, but the analysis of the manufacturing process and quality assurance perspective, self-adhesive material consists of seven parts:
　　1. surface coating
　　For changing the surface properties of the facestock. Such as improved surface tension, change colors, increase the protective layer, etc., to better accept printing inks and easy reach to prevent dirt, increasing the printing ink adhesion and prevent shedding graphic purposes. Surface coating is mainly used for non-absorbent materials, such as aluminum foil, metallized paper and a variety of thin film materials.
　　2．the surface material
     That surface material, a positive acceptance of printing graphics, and finally back to accept the adhesive material is applied to the sticker on. Generally, those who can flexible deformable material can be used as adhesive materials fabrics, such as the commonly used paper, film, foil, composite, all kinds of textiles, thin metal sheet and rubber and so on. The type of surface material depends on the final application and the printing process. Surfaces must be able to adapt to print and print, with good ink receptivity, and have sufficient strength to be able to accept a variety of processing, such as die-cutting, waste discharge, slitting, punching and labeling and so on.
　　3．primed
　　With its surface coating, in that it is coated on the back of the face material, the main purpose of the primer layer is:
　　(1) protect the surface material, to prevent the adhesive penetration.
　　(2) increase the fabric opacity;
　　(3) increase the adhesive force between the adhesive with the surface material;
　　(4) prevent the plastic surface of the material to penetrate into the plasticizer in the adhesive affect its adhesive properties, resulting in reduced adhesion of the label, the label off.
　　4．adhesives
　　Tag binder is a medium between the substrate and the adhesive material, from the coupling effect. Their characteristics may be divided into two kinds of permanent and removable. It has a variety of formulations, suitable for different surfaces and different occasions. Adhesives are adhesive materials technology in the most important ingredient is the key to the label application technology.
　　5．from the type of coating (coated silicon layer)
　　That is the bottom layer of silicone coated paper surface, silicone coated base paper can become very low surface tension, very smooth surface, is to prevent the adhesive bond at the end of the paper.
　　6．the end of paper
　　Role is to accept the end of paper coated with release agent, protecting the back surface of the adhesive material, support surfaces, so that it can be cutting, waste discharge and labeling on the labeling machine.
　　7．back painted or printed on the back
　　Back coating is a protective coating on the back end of the paper, in order to prevent waste discharge, after rewinding label adhesive bonding around in the end paper. Another role is to manufacture multi-layer labels. Back print function is the production of printed on the back end of the paper's registered trademarks or patterns, play the role of propaganda and anti-counterfeiting.