The effect of UV curing is affected by the properties of the cured material
Release date:
2019-01-07
UV Curing It depends on photon-molecule collisions. Light can trigger molecules to diffuse uniformly through the material, but photons are different. In addition to the characteristics of the UV light source, the optical and thermodynamic properties of the cured film and their interaction with radiant energy have a significant impact on the curing process.
Diffusivity: A thermodynamic property that includes specific heat, conductivity, and density; the material's ability to "diffuse" and accept heat; affects the temperature increase of the film and substrate caused by the sudden influx of infrared energy from the surface.
Infrared Absorption Rate: Temperature has a significant impact on the rate of the curing reaction; although the temperature rise in the reaction also affects the temperature, the radiation from the UV lamp is the fundamental source of surface heat, note that it is not heat transferred from the surrounding air or atmosphere. Excessive temperature increase is one of the important limiting factors affecting the curing process.
Optical Density: Similar to absorption, it is composed of two factors: "opacity" and film thickness; includes the dilution effect of absorbed and scattered light; represented by a single number, rather than as a spectral distribution.
Spectral Absorption Rate: Energy is the effect of a substance absorbing wavelengths within a gradually increasing thickness. The more energy absorbed near the surface, the less energy is available in the deeper layers. However, this varies with wavelength. The total spectral absorption rate includes the effects of all photoinitiators, monomers, oligomers, and additives, including pigments.
Reflection and Scattering: Relative to absorption, light energy is more likely to be redirected by (or within) a substance; this is generally caused by the substrate material and/or pigments in the curable material. These factors reduce the UV energy reaching the deeper layers, but improve the curing efficiency at the reaction site.
Visible UV curing machine The effect is also affected by the characteristics of the curing material.
Solidification, energy, UV
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