What is the production process and process of the three heat-sensitive label paper?

The production process and process of the three heat-resistant label paper are relatively complex, mainly including the key steps such as bottom coating (pre-coating), surface coating and top coating. Here is a detailed breakdown of these steps:

First, base coating (pre-coating)

1.Coating preparation: The base coating is mainly composed of pigments (such as kaolin or calcined kaolin), adhesives (such as PVA, carboxylic styrene butadiene latex, etc.) and a small amount of additives (such as dispersants, lubricants, etc.). The solid content of the coating is adjusted according to the different coating methods, generally controlled at 35% ~ 55%, and the amount of adhesive is about 12% ~ 15% (for pigments).

2.Coating: The prepared primer coating is evenly coated on the surface of the base paper to form the first pre-coating. This coating is mainly used as a heat-sensitive coating, and its components include colorless dyes (such as fluorane dyes) and other acidic substances, which will react with color when exposed to heat.

3.Drying: After coating is completed, the thermal paper needs to be dried to ensure that the base coating is firmly attached to the surface of the base paper.

Second, the surface coating

In some cases, in order to improve the waterproof, oil and anti-friction properties of thermal paper, it is also necessary to perform surface coating treatment.

1.Coating preparation: Topcoat coatings usually have specific protective properties, and their formulations are adjusted to meet specific needs.

2.Coating: Apply the topcoat evenly on the first pre-coat that has been dried to form a topcoat. This step further enhances the performance of thermal paper, enabling it to meet the needs of a wider range of applications.

3.Drying: After finishing the coating, it is also necessary to dry the coating to ensure that the coating is firmly attached to the surface of the thermal paper.

Third, top coating

For the three heat sensitive label paper, the top coating is a key step to achieve its water resistance, oil resistance, high temperature resistance and other properties.

1.Surface treatment: Before top coating, it is usually necessary to perform special treatment on the surface of thermal paper, such as oxidation, corona or plasma treatment, to improve its coating performance.

2.Coating: By rolling coating or spraying, the thermal coating with three protection properties is evenly coated on the surface of the thermal sensitive paper. This coating not only enhances the protective performance of thermal paper, but also guarantees its excellent printing effect and durability.

3.Drying: After coating is completed, strict drying treatment is required. The purpose of drying is to firmly fix the thermal coating on the thermal paper, while ensuring the quality and uniformity of the coating. During the drying process, the drying time and temperature need to be strictly controlled to avoid aging or damage to the coating.

Fourth, follow-up treatment

1.Quality testing: After the above process, it is necessary to carry out quality testing on the produced heat-sensitive label paper to ensure that its performance indicators meet the standard requirements.

2.Cutting and packaging: Qualified products will be cut to size and packaged for easy storage and transportation.

In summary, the production process and flow of the three thermal labels involve multiple key steps and complex technical requirements. The smooth progress of these steps not only requires advanced production equipment and strict quality control system as a guarantee, but also requires the operator to have rich professional knowledge and practical experience.