Magnetic printing

Magnetic ink printing is a method of printing with magnetic ink doped with iron oxide powder. Magnetic print is a unique recording medium produced by the combination of recording technology and printing technology. Its characteristic is that data can be written and read on magnetic cards, and text, patterns and photos can be visually recognized.

The magnetic print is formed by applying a magnetic layer on a paper or plastic sheet base, printing characters or patterns on other portions, and a printed layer for displaying visual information corresponding to the use condition, and then molding.

The base of magnetic prints requires moderate toughness, uniform thickness, smooth surface, no stretching or curling when the temperature and humidity changes, good water and corrosion resistance, good printing and processing adaptability, and low price. Commonly used materials include offset paper, coated paper, impregnated resin paper, and polyvinyl chloride (PVC), polyethylene terephthalate (PET), and other plastic film bases and composite materials, with a thickness of 150-800 μm.

The requirements for magnetic powders are high magnetic saturation, uniform particle size, good dispersion, stability, and long aging. Commonly used magnetic hematite, iron oxide attached to iron. Magnetic inks are composed of magnetic powder pigments, binders, desiccants, antioxidants, wetting agents, and other additives. Carbon black is added to the black ink to add other color pigments to the color ink to make the color.

Magnetic printing adopts screen printing or offset printing to obtain ribbon or pattern magnetic layer, which can form magnetic tape where necessary for the card, thereby reducing the cost. The content of magnetic pigment in magnetic ink, the magnetic property of color and the thickness of ink layer after printing Such as magnetic influence.

After the magnetic prints are printed, transparent PVC films are laminated on both sides, pressed with a hot press, and cut to size according to the specified dimensions.

In order to prevent counterfeiting and tampering, magnetic printing has become increasingly more secure and confidential. Therefore, special materials or techniques are used in magnetic materials, printing, and processing methods. For example, special plate-making techniques and inks are used in printing, including printing with fluorescent inks, thermochromic inks, and infrared absorption inks, as well as ground grain printing, microprinting, and rainbow holography to prevent counterfeiting.

Magnetic prints are widely used in finance, credit, communications, office, production management and so on.