State of the art of bar code anti-counterfeiting in commodity anti-counterfeit packaging

The bar code, the abbreviation of bar code, consists of a group of bars with different widths, different reflectivity, and space, which are combined according to a certain code to represent the symbols of a group of data. The bar code of a commodity does not have the ability to prevent counterfeit. It is only a code of a commodity and is designed to use the computer to effectively manage the commodity. However, if we can reasonably use bar code technology, including a reasonable selection of the carrier of the bar code, a reasonable selection of bar code printing methods, a reasonable selection of the bar code printing position, can play a role in anti-counterfeiting.

The first is a reasonable choice of bar code printing methods. The bar code is read by the computer, which requires the quality of the printed matter to be high. The higher the quality of the printed matter, the higher the printing equipment and precision required, and the higher the price of the equipment. Counterfeiters are unable to purchase high-precision equipment, which has a counterfeit effect on commodities and the higher the price of equipment. Its anti-counterfeiting effect is better.

Followed by the correct design and use of bar code on the packaging to achieve the purpose of anti-counterfeiting:

One, invisible bar code

Invisible barcode can achieve the purpose of neither destroying the overall effect of packaging and decoration, nor affecting the characteristics of the barcode. After the stealth barcode is invisible, it is difficult for the general counterfeiter to copy it. Its anti-counterfeit effect is very good, and there is no problem of color registration when printing.

Several forms of invisible bar code:

(1) Covered invisible bar code

The principle of this kind of invisible bar code is to cover it with a special film or coating after the bar code is printed, so that the bar code after processing is hard to read by human eyes. The cover-type invisible bar code has good anti-counterfeiting effect, but its decorating effect is not ideal.

(2) Photochemically processed invisible bar codes

The optical method is used to process common visual barcodes. After processing, people's eyes can hardly find traces. They can't be read with ordinary wavelength light and non-specific light. This kind of invisible barcode is completely invisible. The effect is also very good, it can also be designed as a double anti-counterfeit packaging.

(3) Stealth ink printed invisible bar code

This kind of bar code can be divided into colorless function ink printing bar code and colored function ink printing bar code. For the former, it is generally printed with special inks such as fluorescent ink, thermochromic ink, phosphorescent ink, etc. This kind of invisible bar code must be printed With a particular light, a corresponding sensitive light source must be used in the identification of the bar code. This type of bar code was originally invisible, and the bar code printed for a colored function ink is generally printed with a color change ink. Stealth ink printed invisible bar code process and general printing. However, its anti-aging problem remains to be solved.

(4) Paper invisible bar code

This invisible bar code invisible media is integrated with paper through special photochemical processing and cannot be peeled off. It can only be used for one-time use. It cannot be recognized by the human eye, nor can it be copied by visible light photography or copying, and can only be emitted when discriminated. A wavelength scanner reads the information in the barcode, and the scanner is also compatible with common black and white barcodes.

Second, two-dimensional bar code

For an ordinary linear barcode, it can be called a one-dimensional barcode, which has many advantages: easy to make, easy to read, fast input, high reliability, high degree of standardization of the read-in device, easy to use with computers and other control devices, performance Tends to improve.

However, its information capacity is small, and it must obtain greater information capacity in its limited plane area. Extending one-dimensional code to two-dimensional bar code is the most effective method. The principle of anti-counterfeiting of two-dimensional bar code is to encode and encode the digitized information input by the bar code. For security applications, 2D barcodes are very suitable.