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How to choose an exposure machine for screen printing companies

by:Senxi      2021-03-25
In addition to the screen printing machine in the screen printing industry, the exposure machine is also an indispensable equipment in this industry. The exposure machine is a contact exposure imaging device used to make printing plates. It uses pressure (including atmospheric pressure and mechanical pressure) to make the original plate and the photosensitive plate closely fit, so that the image on the original plate can be accurately exposed through the photochemical reaction. System on the photosensitive plate. Exposure machine is a vacuum imaging device that can complete contact exposure. The exposure machine is mainly composed of a light source device, an exposure chamber, a vacuum chamber, electrical parts, a base and other parts. The printing process can be roughly divided into: vacuum-exposure-development-drying. Among them, the main factors affecting the quality of printing are the vacuum quality and lighting effects.   Vacuum quality: The vacuum effect depends on whether the PS plate and the film are dense. If the density is not good, a virtual network will appear. For example, if a poor printing machine exposes a PS plate with dirty spots, after development, a virtual network the size of a dollar coin (commonly known as the little sun) will appear; some printing machines are not bad at first, but with The number of exposures increases, the characteristics of the blanket change, and the vacuum effect is greatly reduced in less than a year. And a good exposure machine, the vacuum effect is fast and dense, the exposure of the PS plate with dirty spots, after development, it is only a point, it is easy to repair the plate, even if it is a recycled PS plate for proofing, it can also be exposed. It is very good, and it will not change in a few years. Therefore, the vacuum effect is the root of the exposure machine. If you leave this root, nothing else will be discussed.  Lighting effect:   ①Generally, PS plate manufacturers use 355~420nm photosensitive materials, which requires the spectral peak of the light source system to be kept within this range, while the light energy of other bands should be minimized. In this way, it is possible to ensure that the printing time is short and the dot reduction effect is good.  ②The uniformity of the light source of the exposure machine is required to be above 86% (choose precise measuring instruments). Use a film with 30% dots and print a PS plate. After development, use a densitometer to measure. The error between the middle and the four peripheral corners is generally less than 2%, so that it will not appear when printing large areas of color blocks. Chromatic aberration.  ③The stability of the light source refers to the ability of the exposure machine to self-regulate when factors such as the temperature of the lamp tube and voltage fluctuations change, especially for the exposure machine that quickly starts the light source. How do customers judge? Also use a film with 30% dots, expose one plate when the cold machine is started, and then expose 10 PS plates in succession, followed by 30% dots film, to compare the reducibility of the two PS plates. It should be the same when measured with a density meter. This function of the exposure machine is especially important for packaging printing customers. Because, in printing, the color matching is often added. If the PS version's dot restoration is different, the difficulty and consumption of color matching will be greater. Article finishing: screen printing equipment, glass screen printing machine, circuit board screen printing machine, screen printing machine /product-1.html
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