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Varnish overview
At present, there are three types of varnish commonly used for on-line coating, namely, oil-based varnish, ultraviolet curing varnish (UV varnish), and waterborne varnish. In general, oil-based varnish coating is equivalent to printing a single color ink, and the price is cheaper, but the coating is thinner; while the water-based varnish usually needs to be relatively thick; the UV-cured varnish has the best coating effect and is environmentally friendly, but the price It is also the most expensive of the three.
Nowadays, UV varnish is widely used. This varnish contains more than 99% solids. The coating is polymerized under UV irradiation. The curing effect depends on the ultraviolet wavelength and radiation emitted by the UV lamp. power. In general, UV curing varnish has the following advantages:
(1) Gloss coating can produce extremely high gloss;
(2) Strong and durable coating, high wear resistance;
(3) Under the normal condition of UV lamp, the varnish coating can be instantaneously dried;
(4) Do not spray powder after coating Varnish;
(5) Suitable for online coating process.
Of course, the UV-curing varnish is expensive in terms of machinery and equipment. The varnish has high cost and high energy consumption. This is also the reason for its limited use.
Hua from UV Varnish
The HC-UV001 varnish distributed by Huacong belongs to the above-mentioned UV-curable varnish, and is suitable for the surface decoration of various types of labels, books, magazine covers, stickers and other kinds of packaging. Whether it is traditional ink printing graphics or UV ink printing graphics, all apply. In addition to the basic properties of UV Varnish, HC-UV001 Varnish is even more outstanding in terms of abrasion resistance, solvent resistance and stain resistance, and has a fast curing rate, a high gloss and a smooth film layer.
HC-UV001 UV curing varnish has a clear yellowish red appearance with a viscosity of 150 to 180 cps and a curing rate of 12 to 16 m/min (a UV lamp with a power of 80 W/cm, coating thickness of 9 μm). Coating method.
The shelf life of HC-UV001 UV-curable Varnish is 6 months under dark conditions. According to the user's requirements, the product packaging is 20kg/barrel. The storage conditions and precautions of the varnish are described in detail. .
Characteristics of UV Varnish from China
In addition to the basic multi-color printing, today's printed materials often add some auxiliary procedures to make the colors of the printed products more colorful and more beautiful. In the post-printing finishing process, the treatment of the surface of the printed product is an important measure to improve its grade, such as embossing, embossing, coating varnishes. Among them, coating the varnish on the prints is considered a very good surface finishing method by many manufacturers, because it can not only be completed at once with the printing operation, but also the cost is not high. At present, many packaging and printing companies use glazing techniques in order to increase the aesthetics of packaging. Therefore, the application and quality of varnishes have received increasing attention.