1. Surface coating
is used to change the surface characteristics of the face material. Such as improving the surface tension, changing the color, adding a protective layer, etc., to make it better accept ink and easy to print, achieve the purpose of preventing dirt, increasing ink adhesion, and preventing printed graphics from falling off. Surface coating is mainly used for non-absorbent materials, such as aluminum foil, aluminized paper, and various film materials.
2. Surface material
is the surface material, which is the material that accepts printed graphics and text on the front and adhesive on the back and finally applied to the object to be pasted. Generally speaking, all materials that can be flexibly deformed can be used as self-adhesive materials, such as commonly used paper, film, composite foil, various textiles, thin metal sheets, and rubber. The type of surface material depends on the final application and printing process. The surface material should be able to adapt to printing and printing, have good inking properties, and have enough strength to accept various processing, such as die-cutting, waste discharge, slitting, punching, and labeling.
3. Apply the bottom layer
It is the same as the surface coating, except that it is coated on the back of the surface material. The main purpose of coating the bottom layer is:
(1) Protect the surface material and prevent the penetration of the adhesive.
(2) Increase the opacity of the fabric;
(3) Increase the bonding force between the adhesive and the surface material;
(4) Prevent the plasticizer in the plastic surface material from penetrating into the adhesive, affecting its adhesive performance, resulting in a decrease in the adhesion of the label and the label falling off.
The adhesive is the medium between the label material and the bonding substrate, which acts as a connection. According to its characteristics, it can be divided into two types: permanent and removable. It has a variety of formulas, suitable for different surface materials and different occasions. The adhesive is the most important component in the technology of self-adhesive materials and the key to label application technology.
5. Release coating (silicon coating)
is to coat the surface of the bottom paper with a silicone oil layer. The coating of silicone oil can make the bottom paper have very low surface tension and a very smooth surface. The function is to prevent the adhesive from sticking to the bottom paper.
6. Bottom paper
The function of the bottom paper is to accept the release agent coating, protect the adhesive on the back of the face material, and support the face material so that it can be die-cut, discharged, and labeled on the labeling machine.