What is the drying process of PET thermosensitive silver paper?

The drying process of PET thermosensitive silver paper is a crucial step that directly affects the quality and performance of the final product. The following is a detailed analysis of the drying process of PET thermosensitive silver paper:

1、 Drying purpose

The main purpose of drying is to remove moisture or solvents from the thermosensitive coating applied on the PET substrate, allowing the coating to cure and adhere tightly to the substrate. This process helps to improve the printing effect, durability, and stability of the paper.

2、 Drying method

The drying methods for PET thermosensitive silver paper usually include hot air drying and infrared drying. These methods each have their own characteristics and are suitable for different production environments and needs.

Hot air drying:

By blowing hot air into the drying chamber, the convective effect of the hot air is utilized to accelerate the evaporation of moisture or solvents in the coating.

The temperature and time of hot air drying need to be adjusted according to the specific composition and thickness of the coating to ensure the drying effect.

Infrared drying:

Using infrared radiation to heat the coating, causing the moisture or solvent in the coating to evaporate rapidly.

Infrared drying has the advantages of fast heating speed and uniform drying, and is suitable for occasions with high requirements for drying speed and quality.

3、 Drying process control

During the drying process, it is necessary to strictly control the following key parameters to ensure the drying effect and product quality:

Temperature: The drying temperature needs to be precisely set according to the composition and thickness of the coating. Excessive temperature may cause the coating to burn or deform, while insufficient temperature may prevent complete removal of moisture or solvents.

Time: The drying time also needs to be adjusted according to the specific situation of the coating. Excessive time may lead to excessive curing of the coating, affecting the printing effect; If the time is too short, it may not dry completely.

Wind speed/radiation intensity: For hot air drying, it is necessary to control the wind speed to ensure that the hot air can evenly blow the coating; For infrared drying, it is necessary to control the radiation intensity to ensure uniform heating.

Humidity: The humidity inside the drying room also needs to be controlled to avoid the coating absorbing moisture from the air during the drying process.

4、 Post drying treatment

After drying, further processing such as cooling, curing, etc. may be required for PET thermosensitive silver paper. These processing steps help improve the stability of the paper and the printing effect.

In summary, the drying process of PET thermosensitive silver paper is a complex and delicate step that requires strict control of various parameters to ensure the quality and performance of the final product. Through reasonable drying methods and process control, high-quality PET thermosensitive silver paper can be produced to meet various printing needs.