What could be the possible reason for unclear printing on long-lasting three proof thermal paper?

The unclear printing of long-lasting three proof thermal paper may be caused by various reasons. The following are some common reasons and solutions:

1、 Print head issue

Improper temperature setting:

The printing process of thermal paper is achieved by heating the print head. If the print head temperature is set too low, the printed image will be blurry.

Solution: Check the temperature setting in the printer settings and ensure that it matches the requirements of the thermal paper. Adjustments can be made through the printer driver or control panel.

Dirty print head:

Dust, grease, and other impurities on the print head can affect the printing effect and make the printed image blurry.

Solution: Regularly clean the print head by using professional cleaning agents or a soft cloth dipped in some alcohol (it is recommended to use 95% or more industrial anhydrous alcohol) for cleaning. Be careful not to let medical alcohol or tap water enter the print head.

Print head damage:

If the print head is damaged or scratched, it may also cause unclear printing.

Solution: Check the surface of the print head for damage or scratches, and replace it with a new print head if necessary.

2、 Thermal paper issue

Poor quality of thermal paper:

Low quality thermal paper can easily lead to problems such as unclear printing and blurry images.

Solution: Choose high-quality thermal paper and check for scratches on the surface of the paper. You can use your nails to scratch the thermal paper, and the side with black marks is the one that can be printed. If black marks cannot be drawn, it indicates that the thermal paper may have expired or poor quality and cannot be used anymore.

Improper storage environment for thermal paper:

If thermal paper is exposed to high temperature, high humidity, or direct sunlight, it may cause a decrease in its quality, which in turn affects the printing effect.

Solution: Store the thermal paper in a dry environment away from direct sunlight, and regularly replace it with a new one.

3、 Printer setup issue

Driver mismatch:

If the printer driver is not the latest version or not suitable for the current thermal paper type, it may also cause unclear printing.

Solution: Ensure that the latest driver for the model is installed correctly and check if the paper type in the printer settings matches the actual label paper type used.

Connection issue:

If the printer is poorly connected to the computer or the signal is unstable, it may also affect the printing quality.

Solution: Check if the printer is properly connected to the computer. If using a wireless connection, ensure that the signal strength is stable.

4、 Other factors

Loose drum:

When printing, it is necessary to use a roller to firmly press the thermal paper. If the drum becomes loose, it will cause poor contact between the thermal printing needle and the thermal paper, resulting in the inability to print.

Solution: You can open the hood, check if the drum is pressed onto the paper surface, and make corresponding adjustments.

Improper printing density setting:

If the printing density is set too low, it may also cause unclear printing.

Solution: Increase the print density in the printer settings.

In summary, the unclear printing of long-lasting three proof thermal paper may involve multiple factors. When solving problems, it is necessary to investigate and take corresponding measures one by one.