What problems may occur during the printing process of PET thermal sensitive silver paper?

In the process of printing PET thermosensitive silver paper, various problems may be encountered. The following is a detailed summary and analysis of these issues:

1、 Printing quality issues

Printing is not clear:

Reason analysis: It may be due to excessive printing speed or insufficient printing density. In addition, compatibility issues between PET material and carbon ribbon, printer structure problems, or insufficient heat in the print head may also affect print clarity.

Solution: Adjust the printing speed and density to ensure they match the characteristics of PET thermosensitive silver paper. If the problem persists, consider replacing the PET label material, carbon ribbon model, or printer structure, or choosing a barcode printer with a higher heat value.

Ink drying speed decreases:

Reason analysis: The color developer in the thermal sensitive layer of thermal paper is an acidic substance. During the printing process, acidic substances are introduced into the ink, reducing the pH value of the ink and causing the drying agent to fail.

Solution: Properly increase the pH value of the dampening solution and frequently measure and adjust it to ensure its stability during the printing process.

2、 Material handling issues

Adhesive leakage on the end face of fragile paper roll:

Cause analysis: Excessive tension during cutting and rewinding, high storage or printing workshop temperature, and prolonged squeezing or storage time may cause this malfunction.

Solution: Improve storage and processing conditions, wipe the adhesive end face with alcohol to reduce viscosity, gently open the roll and apply powder before slowly rewinding.

3、 Equipment failure and maintenance

Die cutting issue:

Possible issues: PET material is tough, and during die-cutting, it can easily cause the adhesive label to be partially unable to be cut, or the die-cutting edge to be serrated and not smooth.

Solution: Use die cutting knives that have undergone hardness treatment to ensure that the blade angle and hardness are appropriate. At the same time, choose a sponge rubber strip suitable for the hardness of PET thermosensitive silver paper and tightly adhere to the blade of the die-cutting knife. During the die-cutting process, gradually adjust the die-cutting pressure to avoid damage caused by one-time increase.

Print head wear:

Cause analysis: Long term use or high printing density may cause wear on the print head.

Solution: Regularly inspect and replace worn print heads to ensure print quality.

4、 Operation and environmental factors

Improper operation:

Possible problems: Failure to follow standardized operating procedures may result in insufficient die-cutting accuracy, poor printing results, and other issues.

Solution: Strengthen operator training to ensure they are familiar with the printing characteristics and operating procedures of PET thermal sensitive silver paper.

Environmental factors:

Possible impact: Environmental factors such as temperature and humidity in the printing workshop may affect the drying speed and printing effect of ink.

Solution: Keep the printing workshop environment stable and avoid problems such as high or low temperature, high or low humidity.

In summary, the problems that may be encountered when printing PET thermosensitive silver paper involve multiple aspects, including printing quality, material handling, equipment failure and maintenance, as well as operational and environmental factors. To ensure printing quality, it is necessary to comprehensively consider these factors and adopt corresponding solutions.