What are the main materials used to make circular colored copperplate label paper?

Circular colored copperplate label paper is a special type of label paper, which mainly consists of the following materials:

1、 Copperplate base paper

Copperplate base paper is the basic material for circular colored copperplate label paper, mainly made of bleached chemical wood pulp or partially bleached chemical straw pulp. This type of paper requires uniform thickness, low elasticity, high strength, and good water resistance. Copperplate base paper is made on a paper machine, providing a stable substrate for subsequent processing.

2、 Paint

The coating layer is an important component of circular colored copperplate label paper, mainly composed of white pigments, adhesives, and auxiliary additives. White pigments such as kaolin, talcum powder, calcium carbonate, titanium dioxide, etc. give paper a white appearance; Adhesives such as polyvinyl alcohol and casein are used to fix pigments on paper and increase the adhesion of coatings; Auxiliary additives such as gloss agents, hardeners, plasticizers, etc. are used to adjust the performance of coatings, such as glossiness, hardness, and water resistance.

3、 Surface coating

Surface coating is used to change the surface characteristics of paper, such as improving surface tension, changing color, adding protective layer, etc., to make it better accept ink and easier to print. At the same time, the surface coating can prevent dirt, increase ink adhesion, and prevent printed graphics and text from falling off. In circular colored copperplate label paper, the surface coating usually includes materials such as transparent polyester, semi transparent polyester, transparent oriented polypropylene, etc.

4、 Adhesive

In circular colored copperplate label paper, adhesive is used to stick the label paper to the object being pasted. The choice of adhesive depends on the application scenario and pasting requirements of the label paper. The common types of adhesives include rubber based and acrylic based, which have different bonding properties and usage ranges.

5、 Other materials

In addition to the main materials mentioned above, circular colored copperplate label paper may also contain other auxiliary materials, such as silicon oil layer (to prevent adhesive from sticking to the base paper), base paper (to support and protect the label paper), and back coating or back printing (to protect the back of the base paper or for anti-counterfeiting promotion).

In summary, circular colored copperplate label paper is mainly composed of copperplate base paper, coating, surface coating, adhesive, and other auxiliary materials. These materials are combined and processed according to certain proportions and techniques during the processing, ultimately forming label paper with excellent printing and adhesive properties.