What changes will occur to PET matte silver thermal paper after prolonged outdoor exposure?

After prolonged outdoor exposure, PET matte silver thermal paper may undergo a series of changes, which are mainly influenced by outdoor environmental conditions such as temperature, humidity, ultraviolet radiation, and pollutants. The following is a detailed analysis of the possible changes in PET matte silver thermal paper after prolonged outdoor exposure:

1、 Color change

Fading: Images and handwriting on thermal paper are revealed through a chemical reaction formed by heating. Long term exposure to outdoor environments, especially direct sunlight and high temperatures, may cause the chemical substances in the thermal sensitive coating to decompose or oxidize, leading to gradual color fading. This fading phenomenon is particularly evident under long-term storage or high temperature conditions.

Color darkening: In some cases, such as under the influence of certain chemicals or pollutants, the color of PET matte silver thermal paper may darken or show spots. This may be due to a reaction between the chemical substance and the thermosensitive coating, resulting in a color change.

2、 Physical form change

Curling or deformation: PET matte silver thermal paper may curl or deform due to changes in temperature and humidity after prolonged outdoor exposure. This change may affect the flatness and usability of the label.

Surface wear: Natural factors such as sandstorms and rain in outdoor environments may cause wear on the surface of PET matte silver thermal paper. After prolonged exposure, the surface of the label may show scratches, wear, or damage.

3、 Viscosity change

Weakening of stickiness: When exposed to outdoor environments for a long time, especially under the influence of high temperature and humidity, the stickiness of PET matte silver thermal paper backing adhesive may gradually weaken. This may result in the label not being securely attached to the item, or even falling off.

Adhesive aging: UV rays, chemicals, and other factors in outdoor environments may have adverse effects on adhesives, causing them to age, harden, or lose their stickiness.

4、 Other potential issues

Chemical reaction: Prolonged exposure to outdoor environments may cause chemical substances on PET matte silver thermal paper to react with other substances in the surrounding environment, resulting in decreased or ineffective label performance.

Information loss: Due to fading, deformation, or reduced stickiness, the information on PET matte silver thermal paper labels exposed to outdoor environments for a long time may become blurry, difficult to recognize, or completely lost.

In summary, PET matte silver thermal paper may experience color changes, physical form changes, viscosity changes, and other potential issues after prolonged outdoor exposure. To ensure the quality and readability of the labels, it is recommended to take appropriate protective measures, such as storing the labels in a cool, dry, and ventilated place, and avoiding prolonged direct exposure to sunlight or high temperatures. At the same time, regular inspection and replacement of aging labels are also necessary.