Variable temperature security inks

Invisible colorless fluorescent security ink:

The method of using the colorless fluorescent ink is basically the same as that of the common ordinary ink. It is used directly under normal circumstances. The user may also add some solvents or additives according to actual needs, such as:

1. Offset printing: mineral oil, varnish, crude wax, desiccant, slow drying agent, etc.

2, silk screen: 783 thinner, anti-blocking agent, defoamer, cyclohexanone, etc.

3, gravure: Dividers slow, dry, neutral, quick-drying three, users can self-distribution:

A. Slow drying: xylene, butyl acetate, cyclohexanone weight ratio 1:1:1

B. Neutral: Toluene (or xylene), butyl acetate, butanone weight ratio 1:1:1

C. Quick-drying: Toluene, butyl acetate, acetone weight ratio 1:1:1 Colorless fluorescent inks can be mixed with similar four-color inks to form a variety of colored fluorescent inks, but the color and brightness of light will be due to the color and amount of added ink. Different and change, the deployment will also affect the ink nature, the user should be under the guidance of the ink manufacturer to be modulated, or use a special spot color ink.

Users should pay attention to the following points when using offset or gravure colorless fluorescent inks:

1. The need to clean the transfer roller and printing plate, the use of a new ink roller is more ideal, otherwise, a very small amount of colored ink may also bring colorless fluorescent ink with color, affect the quality of printed products.

2. Different papers have different effects on the colorless fluorescent color. Since most paper surfaces are subjected to fluorescent whitening agent whitening, fluorescent whitening agents emit blue-white light under ultraviolet light, so there are no brightener papers (security paper, etc.) and papers containing brighteners ( On plain paper, there are certain differences in the color rendering effect of colorless fluorescent inks. It is worth mentioning that for this reason, colorless fluorescent blue inks are not very suitable for papers containing strong optical brighteners. Otherwise, the blue fluorescence will "flood" in the blue of the brightener.

3. This type of ink can be printed on the non-patterned part of the print or it can be printed on the pattern. To highlight the fluorescent effect, it is usually printed on the outermost layer of the pattern.