How to handle the fading of transparent thermal label paper?

The processing method for transparent thermal label paper after fading, although cannot completely restore its original color, can be made relatively clear through some methods. Here are some suggested solutions:

1、 Heating method

Principle:

The fading of transparent thermal sensitive label paper is due to the chemical reaction of the thermal sensitive coating on it under long-term exposure or environmental factors such as light and temperature, resulting in the gradual disappearance of color.

The heating method reactivates these incompletely reacted chemicals to restore color to a certain extent.

Operation method:

Use safe heating tools such as an electric iron (set to low temperature), an electric straightener, or a hair dryer (avoid using high-temperature hot air to prevent paper damage).

Carefully pick up the faded thermal label paper with tweezers or other tools, and press its back tightly against the heating surface of the heating tool for uniform heating.

The heating time should not be too long, usually ranging from a few seconds to a few minutes, depending on the degree of fading and the heating tool. During the heating process, it is necessary to closely observe the changes in the paper to prevent damage caused by overheating.

After heating, wait for a moment and let the paper cool naturally. At this point, you may notice that the overall color of the paper has darkened, and the originally printed areas appear relatively lighter against a dark background, making the handwriting visible again.

matters needing attention:

Be sure to pay attention to safety during the heating process to avoid burns.

It is strictly prohibited to use open flames or high temperatures to directly heat paper, in order to prevent fires or damage to paper.

The handwriting that appears after heating may not be permanently preserved, so it is recommended to take a photo immediately after the handwriting reappears for future reference.

2、 Chemical solvent method

Principle:

Some organic solvents can dissolve dyes on thermal paper, and by spraying or applying these solvents, some colors on the thermal paper can be removed, thereby restoring the contrast before fading to a certain extent.

Operation method:

Choose suitable organic solvents, such as dewdrops, spirits, etc. (note to choose solvents that will not corrode paper).

Use a spray or cotton swab to evenly spray or smear the solvent on the faded thermal label paper.

Wait a few minutes for the solvent to fully react. At this point, you may notice that some colors on the paper have been removed, and the originally printed areas become relatively clear.

Use a clean tissue or cloth to wipe off excess solvent and residue.

matters needing attention:

When using chemical solvents, it is important to ensure good ventilation and avoid inhaling harmful gases.

When choosing a solvent, consideration should be given to its corrosiveness and safety on paper.

After using the solvent, the paper should be immediately placed in a well ventilated area to dry to prevent further damage to the paper from residue.

3、 Photo preservation method

Principle:

When the thermal label paper fades to the point where it cannot be read directly, the information can be saved by taking a photo.

Operation method:

Use a high pixel digital camera or smartphone to take photos of faded thermal label paper.

Ensure that the photos are clear, complete, and accurately reflect the information on the label paper.

Save photos on electronic devices or cloud storage for future use.

matters needing attention:

When taking photos, ensure sufficient lighting and appropriate angles to achieve the best photo effect.

Regularly check and back up saved photos to prevent data loss or damage.

In summary, transparent thermal sensitive label paper can be processed by heating, chemical solvent method, or photographic preservation method after fading. However, it should be noted that these methods cannot fully restore the original color and clarity of the label paper, and can only improve its readability to a certain extent. Therefore, when using thermal label paper, it is advisable to avoid prolonged exposure to adverse factors such as sunlight, high temperature environments, or exposure to chemicals, in order to extend its lifespan and maintain clarity.