Four Factors Affecting UV Curing Effect

There are four main factors affecting the UV curing process:

 

 

 

One: Light Intensity of UV LED

 

 

 

Indicates the amount of UV light energy obtained per unit area within a specified wavelength range. The intensity of UV light indicates the flux of photons, measured in W/cm2 or mW/cm2. The intensity of light varies with the output power of the light source and the distance between the light source and the surface of the object. Vertical to the light source, the light intensity is the strongest. Light intensity is the embodiment of power supply, light source radiation, reflectivity, focus, lamp size and geometry. The light intensity measured in a certain wavelength range is called effective light intensity. The UV energy of ink and coating is stronger when the light intensity of the surface is strong. The curing depth is mainly affected by the light intensity of radiation, but not by the exposure time. Light intensity plays an important role in the curing of ink with high absorbance (good covering).

 

 

 

II: Spectral Distribution of UV LED

 

 

 

It describes the relative radiation energy of the wavelength emitted by the lamp tube or the wavelength distribution range of the light energy reaching the ink surface. In order to describe the distribution of UV energy, the distribution of UV energy is usually based on the radiation energy in the wavelength range of 10 nm. This makes it easy to compare the spectral distribution of each different light source. Generally, the manufacturers of light sources will provide the spectral distribution of each type of light source.

 

 

 

III: Effective Energy of UV LED Light Source

 

 

 

It refers to the radiation intensity of UV light reaching unit area in a given wavelength range. It represents the total number of photons reaching the surface of an object. The light energy is inversely proportional to the speed of photons and directly proportional to the number of exposure light sources (the number of curing channels or the number of light sources arranged). The effective energy of UV light source is a time accumulation of radiation energy on the surface of the printing material, because the printing material is dried and cured by one light source or another light source. The effective energy is usually expressed by J/cm2 or mJ/cm2.

 

 

 

IV: Infrared Radiation Intensity in UV LED

 

 

 

Infrared radiation intensity is the infrared energy emitted by quartz in the UV light source. Its unit of measurement is the same as the unit of light intensity. The surface temperature it produces may be beneficial or troublesome. Most UV curing inks have "optical thickness". The surface of the inks absorbs a lot of radiated light energy. According to the different pigments in the inks and the different thickness of the ink layer, the absorptivity of light energy in a certain wavelength range will also be different. The spectral absorptivity of ink is a very important parameter in curing process. The absorptivity of UV light source will affect the curing thickness of ink, while the infrared absorptivity will affect the observed temperature.

 

 

 

In order to achieve the best curing effect of UV ink, the curing process and mode of UV ink should be selected according to the printing products of UV ink, photochemistry of UV ink and the characteristics of UV curing light source. Special attention should be paid to the optical characteristics of ink and the matching of ink and curing light source, so that the UV curing equipment can have a very relaxed operating environment.

 

 

 

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