UV coating process: UV curing
Release date:
2019-01-22
UV coating is transparent, and UV light easily penetrates the surface layer to reach the bottom layer. Therefore, the power density of the UV curing lamp should not be too high; generally, the UV lamp power density is controlled at 80-120 W/cm. High power density leads to high lamp temperature, causing the printed matter to deform. The UV coating applied to the surface of the paper absorbs UV light while absorbing heat from the UV lamp, causing one side of the paper to be soaked with UV oil and the temperature to rise, leading to bending or curling deformation, and even causing paper expansion. In particular, thin paper and paper with inconsistent coatings on both sides, such as single-sided thin coated paper, are very susceptible to thermal deformation.
If the printed matter is a low-temperature-resistant film, such as PVC or PE film, it is best to use a UV lamp with a power density of 80 W/cm and a large-opening UV lampshade. This can lower the temperature of the irradiated object and achieve the curing effect by extending the curing length.
UV light over-energy curing is a common problem now. So-called over-energy curing means that the UV energy supplied to the UV oil layer exceeds the energy required for UV oil curing, that is, the UV lamp power is too high. Although over-energy curing can ensure that the UV oil layer is completely cured, the excess UV light energy and heat will lead to many adverse consequences.
First, excess UV light energy can cause cracks in the cured UV film layer because the UV coating molecules that have already been cross-linked into a film will break when they receive UV light energy again. The broken UV oil film layer will crack and reduce the adhesion between the UV oil layer and the printed matter, causing the UV oil layer to peel off. Excess heat energy causes paper deformation and wastes equipment and energy.
uv, curing, energy, power density
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