Technology for drying and curing offset varnish
The choice of varnish application, curing and drying principles, printing characteristics and substrate properties is so rich, so you must be able to find a suitable film-forming speed and quality for each specific printing job Varnish. The technology used is constantly improving, and KBA has been at the forefront in this regard.
General technical requirements for varnishes, drying devices and substrates
The varnish must meet the same technical requirements as the ink in terms of neither agglomeration nor smudging in the stack. In addition, they must be compatible with the inks covered by them, that is, they must provide uniform wetting, strong adhesion, and are not prone to chemical reactions. It is concluded that the form of radiation used for drying or curing the varnish must not weaken the process of drying or curing the ink. Conversely, this means that the ink may have to be dried before the varnish, thereby providing a solid foundation on which the varnish can adhere.
In this KBA 74 Karat's paper delivery device, what looks like the sun shines is the infrared drying device, which is a standard part on models equipped with an aqueous coating unit
For the drying process, the degree of radiation emitted must not cause overheating and excessive drying of the substrate; some substrates of synthetic materials cannot tolerate the heat emitted by infrared radiators and UV lamps. Therefore, the substrate must be compatible with the type of radiation used. Especially UV curing can generate odor in paper coatings. If the UV varnish is cured with cations, the paper coating must not be alkaline. This radiation must not cause the release of any undesirable substances in the varnish. Some UV varnishes contain photoinitiators, which when exposed to UV radiation will split and produce problematic by-products such as isopropyl thioxanthone (ITX). If varnish is to be used in food and medicine packaging, it must be non-migratory.
Generally speaking, the radiator must have a very high efficiency level. The energy input should have the greatest influence on the film formation, and the heating of the substrate and the environment is as small as possible. Glossy varnish takes time to spread and form a smooth and uniform surface. This drying time required for UV varnish is much longer than that required for water-based varnish. In order to avoid any loss of productivity, the customary approach is to extend the drying section, rather than reduce the production speed. Therefore, the printing machine for online glazing should have an extended paper delivery device. In most printers, this part is twice as long as a standard take-up device, and on high-speed printers it is often three times as long. In recent years, water-based varnishes with more water have been developed. One of the results is that the lengthening of the paper take-up device has quickly become the standard configuration of this varnish.
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One key feature of the Fish Tank Filter is its multi-stage filtration process. This typically includes mechanical, chemical, and biological filtration, ensuring that debris, toxins, and harmful substances are effectively removed from the water. This promotes water clarity and provides a safe living space for your fish.
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The Fish Tank Filter also boasts a quiet operation. It is designed with noise-reducing technology, ensuring that it operates silently and doesn't disrupt the tranquility of your living space.
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