How to control the drying process of tag coated paper?

The drying process of the tag coated paper is a key step, which directly affects the quality, printing effect and subsequent processing of the tag. The following are several key aspects of the control of the drying process of tag coated paper:

First, preparation before drying

1.Cleaning treatment: Before drying, ensure that the surface of the coated paper is clean, without oil, dust and other impurities. These impurities may affect the drying effect and printing quality.

2.Temperature and humidity control: The temperature and humidity of the drying environment have an important impact on the drying speed and quality of coated paper. Generally speaking, higher temperatures can speed up the drying speed, but too high temperatures may cause paper deformation or ink fading. Therefore, it is necessary to set the appropriate temperature and humidity according to the paper type, ink type and the characteristics of the drying equipment.

Second, drying process control

1.Drying method selection: There are many drying methods of coated paper, including natural drying, hot air drying, infrared drying and so on. Natural drying is suitable for small batches or occasions with low environmental requirements; Hot air drying accelerates paper drying by heating air, suitable for mass production; Infrared drying uses infrared radiation to directly heat the surface of the paper, which has a faster drying speed and less influence on the deformation of the paper. Which drying method to choose needs to be decided according to the actual situation.

2.Temperature and time control: In the drying process, it is necessary to strictly control the drying temperature and time. Too high a temperature may cause the paper to deform or the ink to fade, and too low a temperature will dry too slowly. At the same time, the drying time needs to be set according to the thickness of the paper, the type of ink and the characteristics of the drying equipment. In general, thicker papers require longer drying times, while papers containing fast-drying inks can be dried in a shorter time.

3.Uniformity control: It is necessary to ensure that the temperature distribution on the surface of the paper is uniform during the drying process to avoid uneven drying caused by local overheating or undercooling. This can be achieved by adjusting the air supply Angle, wind speed and heating element distribution of the drying equipment.

4.Ventilation and exhaust: The steam and volatile organic compounds generated during the drying process need to be discharged in a timely manner to avoid damage to the environment and equipment. Therefore, it is necessary to maintain good ventilation and exhaust conditions in the drying room.

Third, the treatment after drying

1.Quality testing: The coated paper after drying needs to be tested to ensure that its drying effect and printing quality meet the requirements. Check items include paper flatness, gloss, clarity of printed patterns and color brightness.

2.Storage and protection: the dried coated paper should be properly stored and protected from moisture, contamination or mechanical damage. The storage environment should be maintained at appropriate temperature and humidity conditions, and should be checked and maintained regularly.

In summary, the drying process control of tag coated paper is a comprehensive work, which needs to ensure the drying effect and quality from multiple aspects. In actual operation, it is necessary to formulate reasonable drying process parameters and control schemes according to the paper type, ink type and the characteristics of drying equipment.