Brief analysis of the composition of the water-based varnish and their respective uses

2020-08-25 12:14:42

The water-based varnish is mainly composed of three parts: main agent, solvent and auxiliary agent.

1. Main agent. The main agent of water-based glazing oil is film-forming resin, usually synthetic resin, which affects and controls various physical properties of the deep layer and the glazing quality of the film layer, such as gloss, adhesion and drying.

There are many varieties of water-based film-forming resins, but the most commonly used at home and abroad are acrylic resin copolymer resins. The performance of the copolymer resin depends on the composition of the monomer and the synthesis process. Water-based acrylic copolymer resin has a series of excellent properties such as good film forming, good gloss, high transparency, fast drying speed, wear resistance and water resistance, and is widely used in water-based varnishes.

2. Additives. The additive is to improve the physical and chemical properties and processing characteristics of the water-based varnish. The commonly used additives are: curing agents, surfactants, defoamers, desiccants, adhesion promoters, wetting and dispersing agents and other additives.

There are many types of additives, depending on the type of varnish. However, the amount of various additives should not exceed 5% of the total amount, otherwise it will affect the processing adaptability of the varnish.

3. Solvent. The main role of the solvent is to disperse or dissolve synthetic resin and various additives.

In short, whether it is water-based varnish or other water-based materials, they are not ideal for printing on non-absorbent printing materials (on paper with good absorption, the printability is ideal), and need to be further improved And perfect.

The glazing of the flexo printing machine is completed by the printing unit, so it can also be called "printing". You can use water-based varnish, or install a UV drying system, use UV varnish. It is also equipped with a special glazing device for both front and back glazing. It can also be used for the application of self-adhesive glue, and the machine can be combined into a self-adhesive printed product and so on. The glaze coating is thicker than the printing ink layer to obtain better gloss or other effects.

There are quite a variety of glazing (printing) materials, and choosing a suitable varnish is a major factor in improving the quality of flexo products.

Flexographic printing usually adds a color water-based printing or UV printing at the end of the color sequence, which is completed by the printing unit. In addition to enhancing the gloss of the imprint, it is also to enhance the physical properties of the imprinted surface to meet the needs of post-press online processing and the practical requirements of commodity packaging, and has become an indispensable process. There are two types of flexographic printing: water-based varnish and UV varnish.

Printing is divided into full version printing and partial printing.

â‘ Full version printing is printed by a special printing roller (rubber roller seam printing plate).

â‘¡Partial printing needs to be made into a printing plate, glazing according to the required parts of the printing.

It should be pointed out that many packaging prints must use partial printing to meet the requirements of post-printing products.

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â… .  Illustration:

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  • Working Condition: 0 to 50 degree C/ 10% to 90% RH
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Note: The technical specifications herein are for reference only. We remain the rights to upgrade without prior notice. 

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