Magnetic anti-counterfeiting ink features and applications

Anti-counterfeit principle is that the color material uses magnetic substances, such as iron oxide or iron oxide to add cobalt and other chemical substances. Anti-counterfeiting feature is the use of magnetic detector can detect the magnetic signal and decode. The technical requirement is that the magnetic colorant is needle-shaped crystals smaller than micrometers, so that its size and shape can be easily and uniformly arranged in the magnetic field. This magnetic property is produced by the magnetic pigment contained in the ink. The best magnetic pigments are Fe3O4 and Fe2O3. Most of these pigments are needle-shaped crystals smaller than micrometers, and the size and shape of these particles make them extremely easy to align in a magnetic field, resulting in a relatively high residual magnetism. The symbols and numerals with this residual magnetism realize the discrimination function by the friction in the automatic processing device. It is the most commonly used anti-counterfeit ink, its outstanding feature is the appearance of deep color, simple detection equipment.

Another kind of magnetic anti-counterfeiting ink is to make the weak magnetic powder into a magnetic ink. The information characteristics (such as code bar, code width, code distance) and magnetic properties (remanent magnetic ratio, etc.) are printed by PS glue mixing, screen printing, etc. Coercivity ratio) Mixed coding. Magnetic and security inks are used for the identification of images (implicit magnetic sensors for rapid magnetic measurement, accurate testing of various characteristics of coded materials, and completion of logic Decoding).

Magnetic prints are coated with a magnetic layer on a paper or plastic substrate, and graphics can be printed on other parts to obtain visual information. The magnetic layer can write and read data. Magnetic inks were first used in banking and postal services for automatic bank processing of bills and automatic sorting of correspondence at the post office. Magnetic inks are therefore used to print numbers and letters. The use of magnetic ink letter recognition (MICR) can Automatically identify and process printed numbers and letters. For magnetic cards, the transparent PVC film on both sides of the magnetic card is pressed with a hot press to protect the magnetic card, prolong its service life, and prevent tampering.