The basic principle and application development of magnetic ink printing technology

Magnetic ink printing (Magnetic lnk Printing), referred to as magnetic printing, as an anti-counterfeiting printing technology for special inks, is a method of adding magnetic substances to the ink for printing. Magnetic printing belongs to the category of magnetic recording technology, and the magnetic recording body is manufactured by magnetic printing so that it has the required special properties.

1. Basic Technology of Magnetic Printing Magnetic prints are made by applying magnetic layers on paper or plastic film bases, printing letters or patterns on other parts, and printing layers to display visual information corresponding to the conditions of use. 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.

2. Basic principles of magnetic printing The magnetic recording principle used in anti-counterfeit magnetic printing is basically the same as the magnetic recording principle of audio tapes, except that the magnetic recording of anti-counterfeit magnetic printing has relatively low requirements, and the magnetic quality of the magnetic material after magnetic induction is also required. Lower.

3. Development of magnetic inks Currently, MICR (also referred to as MCR) has quickly been replaced by OCR in terms of document classification. This is because OCR inputs information to computers faster. MICR is mainly used in printing anti-counterfeiting and information recording.

4. Application of magnetic printing At present, magnetic printing has been applied in many fields. For example, tickets, monthly passes, printing, bank passbooks, ID cards, etc. can all use magnetic cards. The price list indicates that the magnetic film is used on the card; the data registration form and check Magnetic ink can also be used to print items and other items. The use of magnetic printing is becoming increasingly widespread. The fourth set of renminbi various coupons numbers are printed using magnetic ink.

Japan uses magnetic ink to print yen, but where and how much ink is used is absolutely confidential. The relevant experts examined the Japanese yen banknote with a denomination of 10,000 yuan. The magnetic ink is in the upper right corner. The ink can detect as many as 14 elements, of which the magnetic metals are iron, cobalt, and nickel. The highest iron content is found in cobalt and nickel. The main components of magnetic inks are iron oxide and cobalt oxide. The magnetic field strength of paper is 12 gauss, which is one magnitude higher than geomagnetism.

Because magnetic materials are easily available, magnetic inks printed on products are susceptible to external friction and other effects and magnetic properties are reduced or even lost, affecting the anti-counterfeiting effect. It has been reported that anti-counterfeiting inks developed after being excited by electromagnetic waves have been successfully developed in China.