What is the effect of hot air drying in BOPP synthetic paper printing?

The effect of hot air drying in the printing of BOPP synthetic paper mainly depends on the design and operating conditions of the drying system, as well as the physical and chemical characteristics of the BOPP synthetic paper itself. The following is a detailed analysis of the effect of hot air drying in the printing of BOPP synthetic paper:

First, the working principle of hot air drying system

The hot air drying system sends hot air through the fan to the drying chamber, and uses the high temperature characteristics of the hot air to dry the printed BOPP synthetic paper quickly. Hot air can accelerate the evaporation of solvents or water, thereby shortening the drying time and improving production efficiency.

Second, the impact of hot air drying on the printing effect of BOPP synthetic paper

1. Drying efficiency:

Hot air drying can significantly improve drying efficiency, especially in the printing process of high volume, continuous production. High temperature hot air can quickly take away the solvent or moisture on the printing surface, reduce the drying time and improve the production speed.

2. Printing quality:

Proper hot air drying conditions can ensure that the ink or paint on the surface of the print is evenly cured, avoiding problems such as flow hanging, adhesion or non-drying. This is essential to improve the appearance quality and durability of printed matter.

At the same time, hot air drying also helps to reduce the deformation and curling phenomenon of printed matter, and maintain its flatness and stability.

3. Environmental protection:

During the hot air drying process, most of the solvent or water is evaporated and discharged out of the system, which helps to reduce the emission of harmful substances and meets the requirements of environmental protection.

Third, the factors affecting the effect of hot air drying

1. Hot air temperature:

The hot air temperature is too high, which may lead to overheating, deformation or burning of the printed matter surface; If the temperature is too low, the drying effect is not good, and the drying time is prolonged. Therefore, it is necessary to set the hot air temperature reasonably according to the specific situation of the printed matter and the performance of the drying system.

2. Wind speed and volume:

The appropriate wind speed and air volume can ensure that the hot air evenly and quickly covers the surface of the printed matter, improving the drying efficiency. Excessive wind speed may blow uncured ink or paint; If the wind speed is too small, the drying is uneven.

3. Drying box design:

The design of the drying box should ensure that the hot air can be evenly distributed on the surface of the print to avoid local overheating or undercooling. At the same time, the structure and material selection of the drying oven should also consider its thermal stability and corrosion resistance.

4. Print features:

The physical and chemical properties of BOPP synthetic paper (such as thickness, moisture absorption, heat resistance, etc.) will also affect the effect of hot air drying. Prints with different characteristics may require different drying process parameters.

Fourth, conclusion

In summary, hot air drying has a significant effect in BOPP synthetic paper printing, which can improve drying efficiency, ensure printing quality and meet environmental requirements. However, in order to achieve the best drying effect, it is necessary to reasonably set the drying process parameters according to the actual situation, and pay attention to the maintenance and maintenance of the hot air drying system. At the same time, with the continuous progress and innovation of technology, hot air drying technology will also continue to improve and optimize, bringing more convenience and benefits to the BOPP synthetic paper printing industry.