Pigment and ink providers have been working to solve the problem of limited shelf life of ink. At present, gold and silver powder screen printing inks containing metal particles has been worked out. The shortest shelf life is six months.
Because the aluminum can react with water or moisture and release hydrogen, it may cause an explosion. After the oxidation, the silver paint becomes gray and white. It is because the metal pigment is long-term mixed with a transparent link material. The chemical reaction and emulsification happens. After printing, these small open areas make the color of printing materials or lower ink color come out with the visual changes.
The chemical characteristics of the gold and silver powder pigments they can not be directly added to the ink sold as a finished silicon powder product. Gold ink, silver ink used in metal powder is lightly oxidized copper and aluminum, the role of water, air, heat, certain chemicals will be lost metallic luster. They appear to be golden in gold ink, the pigment is made of copper, zinc, consisting of a mixture in different proportions. Layered gold and silver ink, the resin of the clarity of the higher reflection of light is more, the better the ink gloss.
Pigment particle size is too fine, will sacrifice some of the luster, despite this predicament, and the greater the benefits are that the surface of the cage can be commensurate with good cover (the same weight of pigment fine particles than coarse wide distribution area). The pearl color is pearlescent pigment dispersion (or aluminum) in the link to material or transparent light-colored ink made. This silver can be used for layered gloss ink, but a clear color not as good as the scale of the layered silver ink. Also note that the treated powder paint to withstand the extreme premise as the treated silver paint.
In mixed silver ink, if the aluminum pigment in powder form, necessary to be extremely careful. Oxidation is one reason why gold and silver powder ink color consistency difficult to achieve. Typically used in paint, the less the better. Therefore, use the least amount of pigment under the premise can be content to achieve the target color and cover the cage area. Able to withstand the loss and wear particles in the ink layer of metal above the ink film and then printed on varnished.
The metal powder is easy to oxide, taking powder pigments for example, the oxidation occurs in the copper, zinc particles, resulting in the reduction of the ink gloss, in some cases, the ink will even show a light green. Light syrup is starting to improve ink gloss, dibutyl is used to increase the fluidity of ink, the ink drying function, such as dibutyl and mexican oil, plus have an impact, add some dry oil, enabling fast drying ink. Silver ink blue background, for example, will show a light blue. Powder ink pre-printed has a yellow or green ink film and the ink gold will be changed.
In recent developments, the metallic effect ink types include chrome-plated appearance new effects. Non-layered gold and silver ink has a wide range in silver powder and nickel powder ink. The challenge of creating such ink is: some red, orange and yellow pigments may react with metallic pigment thereby undermining the printed graphic. Like any other products, screen printing person understands gold and silver powder ink composition, producing process and functional limitations. The strengths of ink can be as much as possible introduced to the customer. So it is a golden opportunity for ink printers.Source:http://www.mhcmp.com
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