What should be noted during the coating process of BOPP thermal sensitive synthetic paper?

The coating process of BOPP thermal sensitive synthetic paper is a crucial step that directly affects the quality and performance of the final product. The following are several aspects to pay attention to during the coating process:

1、 Preparation of coating solution

Ingredients and Proportions: The coating liquid is usually composed of a connecting layer, a coloring layer, and a protective layer. The composition and proportion of each layer must be strictly executed according to the production process requirements to ensure that the coated paper has excellent thermal sensitivity and printing effect.

Dispersion and stirring: Each component in the coating liquid needs to be thoroughly dispersed and stirred to ensure the uniformity and stability of the coating liquid. Especially for dyes and colorants, they must be dispersed separately before mixing to avoid premature reactions.

2、 Coating operation

Coating method: Adopt appropriate coating methods, such as measuring rod coating, scraper coating, etc., to ensure uniform coating of the coating liquid. At the same time, it is necessary to control the coating amount to meet the needs of different products.

Coating speed: The coating speed should be moderate to ensure that the coating liquid can fully wet the surface of the paper and form a uniform coating. Excessive coating speed may result in uneven coating, while excessively slow speed may affect production efficiency.

3、 Drying and solidification

Drying temperature: The coated paper needs to be dried to remove moisture and solvents from the coating. The drying temperature should be moderate to avoid coating cracking or discoloration.

Curing time: Curing is a key step in forming a stable structure of the coating. The curing time needs to be long enough to ensure that the components in the coating react fully and form stable chemical bonds. At the same time, excessive curing should be avoided to prevent coating embrittlement.

4、 Quality control

Coating uniformity: By detecting the thickness and uniformity of the coating, the consistency of the coating process can be ensured. Excessive thickness or thinness of the coating may affect the printing effect and thermal performance.

Surface tension: The surface tension of the coated paper should be moderate to ensure the adhesion and printing effect of the ink. The surface tension of paper can be improved through methods such as corona treatment.

5、 Safety and Environmental Protection

Operational safety: Various chemical materials and equipment are required during the coating process. Operators must wear protective equipment and strictly follow the operating procedures to ensure operational safety.

Environmental requirements: The wastewater and exhaust gas generated during the coating process must be properly treated to meet environmental requirements. At the same time, environmentally friendly coating liquids and raw materials should be selected to reduce their impact on the environment.

In summary, the coating process of BOPP thermosensitive synthetic paper requires attention to multiple aspects such as coating liquid preparation, coating operation, drying and curing, quality control, as well as safety and environmental protection. Only by strictly controlling these links can we ensure the quality and performance of the final product.