What is self-adhesive? Back coating is a protective coating on the back of the backing paper to prevent waste discharge. The adhesive around the rewinding label is bonded to the backing paper. Another function 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 base paper, which plays a role in publicity and anti-counterfeiting.

Self-adhesive materials are divided into five categories

1. According to the characteristics of the adhesive, it can be divided into permanent self-adhesive materials and removable self-adhesive materials Material;

2. According to the classification of adhesive coating technology, it can be divided into hot-melt self-adhesive materials, solvent-based self-adhesive materials and emulsion-based self-adhesive materials;

< p>3. According to the adhesive and chemical properties, it is divided into two types of self-adhesive materials: rubber-based and acrylic;

4. According to the properties of the backing paper, it is divided into opaque backing paper, semi- There are three kinds of self-adhesive materials: transparent bottom paper and transparent bottom paper;

5. According to the characteristics of the surface material, it is divided into paper self-adhesive materials, film self-adhesive materials and special self-adhesive materials.

What is the basic structure and function of self-adhesive materials?

Self-adhesive materials are mainly composed of: surface coating, surface material, bottom coating, adhesive, release coating It consists of cloth, backing paper and back coating or back printing. The following is the description of the composition of the self-adhesive material:

(1). Surface coating

Used to change the surface material surface characteristics. Such as improving the surface tension, changing the color, adding a protective layer, etc., to make it better accept the ink and easier to print, to prevent dirt, increase the adhesion of the ink and prevent the 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). Adhesive

Adhesive is the medium between the label material and the bonding substrate, which plays a connecting role. According to its characteristics, it can be divided into two types: permanent and removable. It comes in a variety of formulas, suitable for different surface materials and different occasions. Adhesive is the most important component in self-adhesive material technology and the key to label application technology.

(3). Release coating (silicon coating)

That is, coating a silicone oil layer on the surface of the backing paper. Coating the silicone oil can make the surface tension of the backing paper very low. The very smooth surface prevents the adhesive from sticking to the backing paper.

(4). Bottom paper

The function of the bottom paper is to receive the release agent coating, protect the adhesive on the back of the surface material, and support the surface material so that it can be molded. Cutting, scrapping and labeling on the labeling machine.

(5). Surface material

That is, the surface material, which is a material that accepts printed graphics and text on the front side, accepts adhesive on the back side, and is finally applied to the object to be pasted. ?Generally speaking, any flexibly deformable material can be used as a fabric for self-adhesive materials, such as commonly used paper, film, composite foil, various textiles, thin metal sheets, and rubber. The type of surface stock depends on the final application and printing process. The surface material must be able to adapt to printing and printing, have good inkability, and be strong enough to withstand various processing, such as die cutting, waste removal, slitting, punching and labeling, etc.

(6). Back coating or back printing

Back coating is a protective coating on the back of the base paper to prevent waste discharge and adhesive around the rewinding label. The mixture is bonded to the backing paper. Another function 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 base paper, which plays a role in publicity and anti-counterfeiting.

(7). The bottom coating

It is the same as the surface coating, but it is coated on the back of the surface material. The main purpose of the bottom coating is:

< p>A>Protect the surface material and prevent adhesive penetration.

B>Increase the opacity of the fabric;

C>Increase the bonding force between the adhesive and the surface material;

D>Prevent plastic The plasticizer in the surface material penetrates into the adhesive, affecting its adhesive performance, causing the label's adhesive force to decrease and the label to fall off.

The main uses of self-adhesive labels

1. Paper self-adhesive labels are mainly used for liquid washing products and popular personal care products; film materials are mainly used in On high-end daily chemical products. At present, popular personal care products and household liquid washing products account for a large proportion on the market, so the corresponding paper materials are used more.

2. PE, PP, PVC and other synthetic materials are commonly used for film self-adhesive labels. The film materials mainly include white, matte and transparent. Since the printability of film materials is not very good, corona treatment is generally performed or a coating is added to the surface to enhance its printability. In order to prevent some film materials from deforming or tearing during the printing and labeling process, some materials will also undergo directional treatment and undergo uniaxial stretching or biaxial stretching. For example, biaxially stretched BOPP materials are quite commonly used.

The application fields of self-adhesive labels are quite wide. Common barcode labels include drug labels, food labels, wine labels, battery labels, outer box labels, shampoo labels, barcode labels, temporary labels for semi-finished products, etc. Mainly film, it is mainly used for decorative decals on cars and motorcycles, logos on trademark windows, reflective films on highways, markings on containers, etc.

The above is about what stickers are, I hope it can be helpful to everyone!