What are the factors that affect the incomplete curing of UV varnish and LED UV varnish?

Factors related to solidification equipment

The curing process of UV varnish and LED UV varnish relies on professional curing equipment. If the power of the UV lamp is insufficient, aging, or the surface is dirty, it will cause insufficient light intensity, thereby affecting the curing effect of the varnish. In addition, if the distance between the lamp tube and the solidified object is too far, it will also reduce the light intensity, resulting in incomplete solidification. For LED UV varnish, if the wavelength of the LED light does not match the photoinitiator of the varnish, it can also lead to incomplete curing. Therefore, regular inspection and maintenance of curing equipment to ensure that the power and wavelength of the lamp tube meet the requirements is an important factor in ensuring complete curing of the varnish.

Material factors

The formula and quality of the varnish itself have a direct impact on the curing effect. If the content or activity of the photoinitiator in the varnish is insufficient, it will lead to incomplete curing. In addition, the viscosity of the varnish and the amount of diluent used can also affect the curing effect. For example, excessive diluent can prolong the curing time and reduce the curing effect. The properties of the substrate can also affect the curing effect. If the surface treatment of the substrate is improper, such as oil stains, dust, etc., it will affect the adhesion between the varnish and the substrate, resulting in incomplete curing. Therefore, selecting appropriate varnish and substrate, and treating the surface of the substrate appropriately, is the key to ensuring the curing effect.

Technology factor

The coating process also has a significant impact on the curing effect of varnish. If the coating amount is too small and the gloss layer is too thin, it will lead to incomplete curing. In addition, excessive coating speed and uneven coating can also lead to incomplete curing. Therefore, during the coating process, it is necessary to adjust the coating amount and speed according to the actual situation to ensure that the coating layer is uniform and of moderate thickness. Environmental factors such as temperature and humidity in the curing process can also affect the curing effect. For example, high environmental humidity can cause the varnish to absorb too much moisture during the curing process, resulting in incomplete curing. Therefore, during the curing process, it is necessary to control the ambient temperature and humidity to ensure stable curing conditions.
environmental factor

The oxygen in the environment can have an impact on the curing of UV light oil. During the curing process, if the air circulation is not smooth, oxygen will interfere with the absorption of UV light, resulting in incomplete curing. Therefore, during the curing process, it is necessary to maintain air circulation in the working area to reduce the impact of oxygen on the curing process. In addition, impurities such as dust and particles in the environment can also affect the curing effect. These impurities may adhere to the surface of the varnish, forming bubbles or pockmarks, affecting the curing quality. Therefore, it is necessary to maintain a clean working environment and reduce the interference of impurities.