Application of Various Types of Fluorescent Ink in Screen Printing (Part 2)

Fast dry fluorescent ink

The fast-drying fluorescent ink is an ink produced by adding a fluorescent pigment to a fast-drying connecting material. The ink has good brightness and flexibility and is suitable for outdoor poster printing. Most of them are dried by evaporation. They must use lacquer screens such as photographic type, water-based film type, ink type, and knife-cut stencil printing.

When the fluorescent ink is to be printed on a non-white surface, the surface should first be coated with a white base. The fast-drying fluorescent ink can be printed on the uncoated cloth label and can be printed on the surface of the pigment or nylon. A test should be done when it is not known whether the ink is bonded to the printed surface.

The life of fluorescent ink printing products is determined by the ink, not by the product itself. If the quick-drying ink can prevent direct sunlight, the life of the printed product can be greatly improved. In the absence of light, fluorescent ink printing products can be preserved and maintain their original appearance.

The quick-drying ink takes about 30 minutes to dry naturally, and mechanical drying can shorten the time to 30 seconds to 2 minutes.

The preferred ventilation area is the conditions required for printing and drying. The drying process must be completed as quickly as possible to prevent blemishes from appearing during printing. A single-edged squeegee can produce an ink layer thickness of about 0.0025 to 0.0038 cm. After printing, the screen can be cleaned with paint thinner, toluene, xylene, naphtha, or the manufacturer's recommended solvent. Indoor products can be screen printed with Number8XX~14XX; outdoor products can be screen printed with Number8XX~10XX.

After large-scale outdoor advertisements are made, it is recommended to use clean water, because the sticker absorbs ultraviolet rays and weakens the luster of the fluorescent ink.

Oil based fluorescent ink

If the oil-based fluorescent ink can be printed better, the brightness can be maintained for the same time as the fast-drying ink, and the outdoor print can be maintained for about 3-6 months. It takes 1 to 4 hours for the ink to dry by oxidative polymerization, which is mainly related to the printing substrate, ink layer thickness, and workshop conditions. The drying of the ink can also be accelerated by gas heating, infrared rays, and spray drying agents. It is also possible to dry using a common ink drying method. Oil-based fluorescent inks can be printed with most screen printing and can be printed on paper, wood, glass, metal, decals, and other surfaces with a white base coating. The ink can be printed with screens 8~16.

Oil-based fluorescent inks can be diluted with mineral spirits or the manufacturer's recommended solvent. The printing of letters should be in bold type with some contrast. Do not overprint the varnish on the ink, it will reduce the fluorescence effect.

Oil-based inks should not be mixed with fast-drying fluorescent inks. The use of oil-based fluorescent inks for wide-format advertising printing also requires the use of clean water to wash away stickers.

Luminous fluorescent ink

The fluorescent inks introduced above are all daylight fluorescent inks. The following describes fluorescent luminous inks. Luminous fluorescent inks are best used in screen printing. The ink is responsive to "night light". Sometimes people call the color of luminous fluorescent inks "invisible light" because it appears neutral or nearly white under sunlight or incandescent light. Most luminous fluorescent inks do not differ from ordinary inks during the day, but they can emit brilliant brilliance under a night light or near-ultraviolet light. The light source can be a mercury lamp or a fluorescent night light. The biggest difference between the luminous fluorescent ink and the daylight fluorescent ink is that the latter can emit light in both day and night light, while the former only emits light under the night light.

The printing of luminous fluorescent inks is similar to the printing of daylight fluorescent inks. It cannot be mixed with ordinary inks, because in the nighttime, ordinary inks will affect the fluorescent effect of fluorescent inks. In addition, the printer should follow the manufacturer's instructions when using it.

In summary, fluorescent inks play a key role in screen printing. Its use brings brilliant colors to screen printing.