Will thermal label paper change color after being stored for a long time?

Thermal label paper does indeed change color after being stored for a long time. The storage time of thermal label paper is related to multiple factors. The following is a detailed analysis of this issue:

Reason for discoloration

The discoloration of thermal label paper is mainly due to its reversible color reaction, that is, colored products will decompose to varying degrees on their own, causing the color of the handwriting to gradually fade until it disappears. This process is influenced by various factors such as light, temperature, humidity, and the quality of the thermal paper itself.

Save time

The storage time of thermal label paper varies due to differences in quality, processing, and storage methods. Generally speaking, if stored properly, the handwriting on thermal paper can be preserved for several months to about a year. High quality thermal paper may be stored for a longer time in a cool and dry environment, while thermal paper with poor quality or harsh storage conditions (such as high temperature, humidity, direct sunlight) may fade quickly. Some specially treated thermal paper, such as three proof paper thermal labels (waterproof, oil resistant, and scratch resistant), can be stored for relatively longer periods of time.

Methods to extend storage time

To extend the storage time of thermal label paper, the following measures can be taken:

Avoid direct sunlight: Store thermal label paper in a dark place to reduce UV damage to the paper.

Moisture and sun protection: Keep the storage environment dry and clean, and avoid paper from getting damp or prolonged exposure to sunlight.

Reasonable packaging: Use moisture-proof paper or plastic film to package and seal the thermal label paper to prevent dust and pollutants from entering.

Control temperature and humidity: Store thermal label paper under suitable temperature and humidity conditions, such as 23 ± 2 ℃ and RH65 ± 5% relative humidity, which can be stored for a long time.

Other precautions

Avoid using transparent adhesive tape to cover: The alkaline substances on the transparent adhesive tape may undergo chemical changes with the coating on the surface of the thermal paper, causing the label to fade.

Choose high-quality thermal paper: High quality thermal paper has a longer shelf life and more stable color development performance.

In summary, thermal label paper does indeed change color after a long storage time, but through reasonable storage measures and the selection of high-quality thermal paper, its storage time can be extended to a certain extent. If you need to store labels or documents for a long time, it is more recommended to use devices such as heat transfer label machines/printers or inkjet and laser printers with more durable printing effects.