1. Back coating or back printing
Back coating is a protective coating on the back of the backing paper to prevent waste discharge, and the adhesive around the rewound label is bonded to the backing paper. Another role is to create multi-layer labels. The function of back printing is to print the manufacturer's registered trademark or pattern on the back of the backing paper, which plays the role of publicity and anti-counterfeiting.
2. Surface coating
Used to change the surface properties of the surface material. Such as improving the surface tension, changing the color, adding a protective layer, etc., so that it can better accept ink and be easy to print, so as to prevent dirt, increase ink adhesion and prevent printing graphics from falling off. Surface coating is mainly used for non-absorbent materials, such as aluminum foil, aluminized paper and various film materials.
3. Surface material
That is, the surface material is a material that accepts printed graphics on the front and adhesive on the back and is finally applied to the object to be pasted.
Generally speaking, any flexible and deformable material can be used as the fabric of self-adhesive materials, such as commonly used paper, film, composite foil, various textiles, thin metal sheets and rubber. The type of facestock depends on the final application and print finish. The surface material should be able to adapt to printing and printing, have good ink receptivity, and have enough strength to accept various processing, such as die cutting, waste discharge, slitting, punching and labeling, etc.
4. Adhesive
The adhesive is the medium between the label material and the bonding substrate, acting as a link. According to its characteristics, it can be divided into permanent and removable. It comes in a variety of formulations for different surfaces and different occasions. Adhesive is the most important component in self-adhesive material technology and the key to label application technology.
5. Release coating (silicon coating) is to apply a silicone oil layer on the surface of the backing paper. Applying silicone oil can make the backing paper a very low surface tension and a very smooth surface, and the function is to prevent the adhesive from sticking to the backing paper. superior.
6. Backing paper
The function of the backing paper is to accept the coating of the release agent, protect the adhesive on the back of the face material, and support the face material so that it can be die-cut, waste discharged and labeled on the labeling machine.
7. Apply the bottom layer
It is the same as the surface coating, but 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 adhesive from penetrating.
(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 adhesive force of the label and the label falling off.
