How is the thermosensitive coating of PET thermosensitive silver paper made?

The production of thermosensitive coating on PET thermosensitive silver paper is a process involving multiple steps and various chemical raw materials. Although the specific manufacturing process may vary depending on the manufacturer and product specifications, generally speaking, the production of thermal sensitive coatings includes the following key steps:

1、 Raw material preparation

The main raw materials for thermal sensitive coatings usually include fillers, colorants, sensitizers, dyes, dispersants, adhesives, and lubricants. Among them, the color developer is a key component of the thermosensitive reaction, which can react with the latent dye when heated, resulting in a color change.

2、 Mixing and dispersion

Mixing raw materials: Mix various prepared raw materials in a certain proportion. This step requires precise control of the amount of each raw material used to ensure the performance of the final coating.

Dispersion treatment: In order to ensure the uniformity and stability of the coating, it is necessary to disperse the mixed raw materials. This usually involves high-speed stirring or the use of chemical means such as dispersants to break down the agglomerates in the raw materials and form a uniform dispersion.

3、 Coating and drying

Coating process: Uniformly dispersed thermosensitive coating is applied to the surface of PET substrate through methods such as air knife coating, scraper coating, roller coating, scraper coating, or curtain coating. During the coating process, it is necessary to control the thickness and uniformity of the coating to ensure the printing effect of the final product.

Drying treatment: After coating is completed, the coating needs to be dried. The purpose of this step is to remove moisture or solvents from the coating, allowing it to solidify and adhere to the PET substrate. The control of drying temperature and time has a significant impact on the performance of coatings.

4、 Post processing and inspection

Post treatment: Depending on the product specifications and usage, further treatment of the coating may be necessary, such as applying a protective layer or surface treatment. These processing steps aim to improve the durability, scratch resistance, and waterproofness of the coating.

Quality inspection: Finally, it is necessary to conduct quality inspection on the completed PET thermosensitive silver paper. This includes checking the uniformity, color rendering effect, durability and other performance indicators of the coating to ensure that the product meets quality standards and usage requirements.

In summary, the production of thermal sensitive coating for PET thermal sensitive silver paper is a complex and delicate process, involving multiple steps such as raw material preparation, mixing and dispersion, coating and drying, as well as post-treatment and inspection. Each stage requires strict control of process parameters and quality standards to ensure the performance and quality of the final product.