Ultraviolet Intensity Tester Ultraviolet Intensity Tester is used to test the light intensity of ultraviolet radiation. It is a device with dry battery and portable structure.
It consists of a sensor, a wavelength filter and a control unit with a liquid crystal display (LCD).
At present, most of the exposure light sources of exposure machines use metal halide lamps, high-pressure mercury lamps or capillary ultra-high-pressure mercury lamps.
For example, the capillary ultra-high pressure mercury lamp is an ionic device. During operation, mercury arc discharge is used to generate strong electromagnetic radiation under ultra-high pressure. Its radiant energy and wavelength are continuous from the near ultraviolet region to the visible light, and the wavelength The main function of the filter is to select the ultraviolet light wavelength within the range of 3 nm to 43 nm sensitive to the photosensitive film, and the unit of measurement from the external light intensity is mw / cm.
There are two important factors that should be considered when screen printing screen exposure.
First, the energy radiated from the external light source is the light intensity; second, the uniformity of the distribution of the light source radiated to the entire screen area.
Although most good-quality exposure machines are equipped with a light energy integrator to measure and compensate the output energy of ultraviolet light, it cannot explain the distribution of the intensity of the light source and the intensity of the ultraviolet component, that is, the state of ultraviolet radiation density Nor can they measure their values.
The article describes five kinds of measuring instruments used for screen-making, combined with screen-screening machine for screen-making, automatic screen-coating machine, dryer, developing machine, cleaning machine and exposure machine, etc. The relevant technical parameters of the control make the process control and quality management of the process flow of the screen-making process finally become a standardized, intuitive, and quantitative process, which provides conditions for ensuring qualified products for screen printing.
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