How To Choose Varnish?
How To Choose Varnish?
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Varnishing refers to coating or printing a layer of colorless and transparent ink or raw material on the surface of printed matter (commonly known as "varnish"). After drying or even calendering, the surface gloss and smoothness of printed matter are greatly increased. , Highlighting the grade of printed matter. Secondly, glazing can improve the abrasion resistance of the printed surface and protect the graphics of printed products. For printed finished products that have been processed, the common practice is to use silk screen UV glazing and coating glazing, while the more advanced glazing is to be completed at the same time as on-line operation and printing. Due to different raw materials and glazing methods, Of course, these kinds of glazing effects are also different.
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The most important purpose of glazing is to add value to packaging and printed matter. Because the surface adds bright gloss and three-dimensional sense, the appearance texture is more refined, and it is easier to become a visual focus in a variety of product furnishings.
On the surface of paper prints, there are many types of varnishes according to the way of light coating, such as: coating varnish, UV varnish, flexo varnish, etc., then we should choose How to choose?
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The quality of printed varnishes depends largely on the varnish used. There are three types of varnishes: oily varnish, waterborne varnish, and UV varnish. Oily varnishes contain volatile solvents, which have a negative impact on health and are not conducive to environmental protection. In contrast, water-based varnishes and UV varnishes will take more share in the market. Whether it is UV varnish, water-based varnish, ordinary varnish, or special processing, each has its advantages and disadvantages. Certain market demand, but water-based glazing is undoubtedly the most advantageous, because it is healthy and environmentally friendly, low in price, and widely used.
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In developed countries, water-based varnishing has become the mainstream of glazing technology. Paper surfaces treated with water-based varnish can be post-processed with or without light, such as local UV, bronzing, gold sweeping and embossing Finishing and other finishing work, but the gloss of the water-based varnish is about 70%, but the gloss of UV varnish can reach about 90%, so the process effect is obviously different.
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UV varnish is the most used in the market. UV varnish can be divided into special varnishes such as thin paper, thick paper, gold and silver cardboard according to different printing materials. Do not add thinner when using UV varnish. The product did not reach the expected gloss. In the actual operation process, since the UV varnish must be heated to 50 ° C before it can be used, there are still certain defects in safety production.
