What factors will cause the stickiness of self-adhesive coated paper to decline?

There are many factors that lead to the decline of stickiness of self-adhesive coated paper, mainly including the following aspects:

First, environmental factors

1.Temperature and humidity:

Temperature: The viscosity of the adhesive is greatly affected by temperature. In a high temperature environment, the chemical structure of the adhesive may be damaged, resulting in reduced viscosity and even peeling phenomenon. On the contrary, in the low temperature environment, although the viscosity may be enhanced, but too low temperature will make the adhesive hard, affecting the adhesion tightness.

Humidity: When the humidity is too high, the adhesive may absorb water and affect its viscosity. Especially for water-adhesive self-adhesive, high humidity will lead to its adhesive surface can not adhere firmly.

2.Environmental pollution: Pollutants such as oil, dust, and chemicals may be attached to the adhesive surface or adhesive surface, reducing its viscosity.

Second, material aging

The adhesive will gradually age during use, resulting in a decrease in viscosity. The causes of aging may include UV exposure, oxidation, chemical reactions, etc. Prolonged exposure to sunlight or harsh environments can speed up this process.

Third, paste time

Too long pasting time may also lead to a decline in adhesive stickiness. In the paste process, if the time is too long, the stickiness of the adhesive may gradually weaken, affecting the paste effect.

Fourth, material characteristics

1.Surface energy: The surface energy of the adhesive will affect the stickiness of the adhesive. Materials with high surface energy usually have higher viscosity than materials with low surface energy.

2.Roughness of the surface: The roughness of the surface of the paste will also affect the stickiness. Too rough a surface may reduce the adhesion of the glue.

3.Glue type: Different types of glue differ in terms of stickiness. For example, hot melt adhesives are generally stickier than water adhesives, but may behave differently on some surfaces.

Fifth, improper use

1.Insufficient stroking pressure: Appropriate stroking pressure helps the flow and diffusion of the pressure-sensitive adhesive, thereby enhancing the contact and adhesion effect of the glue and the paste. If the stroking pressure is insufficient, it may lead to a decrease in viscosity.

2.Improper storage conditions: If the self-adhesive label is affected by factors such as large ambient temperature difference, large humidity fluctuations, or improper stacking during storage, its stickiness may be affected.

In summary, the factors that lead to the decline of adhesive coated paper viscosity are many, including environmental factors, material aging, paste time, material characteristics and improper use. In order to maintain the stability of the adhesive and achieve good adhesive effect, it is necessary to pay attention to the influence of these factors and take appropriate measures to deal with it.