What is the production process of transparent thermal label paper?

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

1、 Raw paper preparation

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. The quality of the base paper directly affects the adhesion effect of subsequent coating and thermal sensitive coating.

2、 Apply thermal sensitive coating

Apply a layer of "thermosensitive coating" (thermosensitive color changing layer) on the base paper, which is the core part of transparent thermosensitive label paper. Thermal sensitive coatings are mainly composed of various chemical substances such as colorless dyes, colorants, sensitizers, stabilizers, adhesives, etc. These components can undergo chemical reactions under heating conditions, releasing colors and forming visible images or text.

The coating process is usually divided into multiple steps, such as pre coating to form a pre coating layer, and then surface coating to form the final thermosensitive color changing layer. Drying and curing treatment is required after each coating to ensure that the coating adheres firmly to the paper and achieves the best printing effect.

3、 Drying and curing

After coating, the paper needs to be dried and cured. There are various drying methods, including airflow drying under low temperature conditions and rapid drying using ultraviolet lamps. Curing treatment is to ensure a stronger bond between the coating and the paper, and to improve the durability and adhesion of the label.

4、 Add protective layer (optional)

In order to improve the durability and adhesion of transparent thermal label 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

After the above processing, the paper will be cut to meet the needs of different sizes and specifications. Then, package the cut paper to protect the labels from damage 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 of transparent thermal label paper meets the standards and customer requirements.

In summary, the production process of transparent thermal label paper is a complex and delicate process that requires strict control of the quality and process parameters of each step to ensure the quality and performance of the final product.