The production process of thermal label paper

The production process of thermal label paper mainly includes the following key steps:

First, raw material preparation

Paper base selection: The bottom layer of thermal label paper is a paper base, and paper with a certain thickness and strength is usually selected as a substrate to ensure stability and durability in the printing process.

Second, coated with heat-sensitive coating

1.Composition of thermal coatings: Thermal coatings are mainly composed of thermal pigments (such as colorless dyes, phenols or other acidic substances), polymers and other additives. Thermal pigment is a key part of thermal paper, which contains compounds that can react biochemically under hot conditions, and this compound will release heat after the reaction, making the color of the coating change. The polymer acts as a bond for the heat-sensitive pigment to the paper substrate.

2.Coating process: Manufacturers use rollers or other coating equipment to evenly coat the heat-sensitive coating on the paper substrate. The thickness and uniformity of the coating need to be controlled during the coating process to ensure print quality.

Third, dry and finalize

Drying method: After the heat sensitive coating is applied, it needs to be dried to remove moisture from the coating. There are a variety of drying methods, including air drying at low temperatures and rapid drying using ultraviolet lamps. The drying process not only helps to remove moisture, but also ensures the gloss and flatness of the coating.

Fourth, coating protective layer (optional)

The role of the protective layer: In order to improve the durability and adhesion of the thermal label paper, a protective layer is sometimes covered on the thermal sensitive coating. The protective layer can absorb some of the light that causes the chemical reaction of the thermal coating, slowing the deterioration of the printing paper, while protecting the thermal components of the printer from damage.

Coating and drying: The coating and drying method of the protective layer is similar to that of the production of the thermal coating, which is also accomplished by the coating and drying process.

Fifth, cutting and packaging

Cutting: Cut the coated and dried thermal label paper according to the required specifications to form a single sheet or roll label paper.

Packaging: Package the cut heat-sensitive label paper to prevent moisture, contamination and damage. The packaging material is usually moisture-proof paper or plastic film, and the relevant information and instructions of the product are marked.

Sixth, quality inspection

In the entire production process, it is necessary to carry out strict quality testing on raw materials, semi-finished products and finished products to ensure that the quality of thermal label paper meets the standards and customer requirements. The test content includes the flatness of the paper, the uniformity of the coating, the printing effect and the durability.

In summary, the production process of thermal label paper is a complex and fine process, which requires strict control of all aspects to ensure product quality. By continuously optimizing the production process and technical means, the performance of thermal label paper can be further improved and the cost can be reduced to meet the diversified needs of the market.