What are the key steps in the production process of transparent thermal label paper?

The production process of transparent thermal label paper involves multiple key steps, which ensure the quality and performance of the final product. The following are the key steps in the production process of transparent thermal label paper:

1、 Raw paper preparation

Choosing a substrate: Choosing high-quality paper with a certain thickness and strength as the substrate is the foundation for ensuring stability and durability during the printing process.

Preprocessing: Necessary pretreatment of the base paper, such as dust removal, static electricity removal, etc., to ensure the smooth progress of the coating process.

2、 Apply thermal sensitive coating

First pre coating: Use a relatively coarse particle size coating for the first pre coating to form the first pre coating, which is the thermal sensitive coating. This layer of coating is mainly composed of various chemical substances such as colorless dyes (such as phenols or other acidic substances), colorants, sensitizers, stabilizers, adhesives, etc.

Drying and curing: After coating is completed, drying and curing treatment is carried out to firmly adhere the coating to the paper and achieve the best printing effect. Drying methods may include airflow drying, rapid drying with ultraviolet lamps, etc.

3、 Second pre coating and surface coating

Second pre coating: Sometimes it is necessary to use a coating with relatively fine particle size for the second pre coating to form a second pre coating. This step can further improve the uniformity and performance of the coating.

Topcoat: Apply topcoat on the second precoating layer to form a topcoat. The topcoat may contain some special additives to improve the waterproof, oil resistant, and friction resistant properties of the label paper.

4、 Add protective layer (optional)

In order to improve the durability and adhesion of thermal paper, sometimes an additional protective layer is applied on top of the thermal coating. The protective layer can absorb some of the light that causes chemical reactions in the thermal sensitive coating, slow down the deterioration of the printing paper, and protect the thermal sensitive components of the printer from damage.

5、 Cutting and packaging

Slitting: Cut the coated paper into predetermined sizes to meet different market demands.

Packaging: Packaging the cut paper to protect it from contamination and damage, and ensure stability during transportation and storage.

6、 Quality inspection

Strict quality inspection is also required for raw materials, semi-finished products, and finished products throughout the entire production process. The testing content includes the flatness of the paper, the uniformity of the coating, the printing effect, and durability. These testing steps ensure that the quality and performance of the final product meet the standards and customer requirements.

In summary, the production process of transparent thermal label paper involves multiple key steps, each of which is crucial and collectively determines the quality and performance of the final product. By strictly controlling the process parameters and quality standards of each step, high-quality transparent thermal label paper can be produced.