Barcode performance and use of commodity printing and packaging 1

In packaging and anti-counterfeit printing, bar code labels are convenient for users to quickly read commodity general information and certain anti-counterfeiting functions, and have a great effect on improving product sales management and product anti-counterfeit security. Although it does not provide detailed information on product production, shelf life, and management, the anti-counterfeiting effect is not ideal, and it has gradually been replaced by RFID (radio frequency identification tag). However, due to the bar code has a small investment in equipment, printing production is convenient, the scope of use Many advantages, such as wide use, still occupy a large area of ​​rivers and mountains, and it still plays an important role in the packaging of ordinary goods with low anti-counterfeiting requirements.

Bar code printing can use a variety of printing methods, the following will talk about bar code printing technology requirements and some issues that need to pay attention to in screen printing.

First, the function of bar code and its application in packaging and printing

Bar code is an automatic identification information code. Due to its high data collection rate, high reliability and low cost, it is widely used in many books, stickers, goods and packaging. The bar code is composed of a certain length, width and width of lines and numbers, and can be read by the photoelectric scanning reading device graphics language.

Barcodes are kinds of data input technologies and automatic identification technologies that have been researched and developed in recent decades. They can reflect many types of information such as the type, manufacturer, weight, amount, date of manufacture, and circulation room of suppliers, and are used in the production, sales, storage, and inspection of commodities. Exchanges and other aspects play a major role in linking manufacturers, exporters, sellers, and customers around the world.

The barcodes seen on the market are all early one-dimensional barcodes. With the development of VLSI technology, the ability to resist the pollution of one-dimensional barcodes has been reduced and the area of ​​barcodes has been reduced. The bar code (2D code for short) makes the area of ​​the bar code smaller and smaller, the function of the bar code reader is greatly improved, the reading is more accurate and accurate, and the bar code storage space is increased. In addition, encryption technology can also be used in two-dimensional bar codes to greatly improve the anti-counterfeiting performance of products.

According to the structural differences, two-dimensional barcodes can be divided into two types: stacked and matrix.

In printing, not only black characters can be printed on white paper, but also can be printed in color, regardless of the printing machine or the printing object. The reading of data can be rotated 360° from line to surface, and the malfunction correction function can be used. Damaged or damaged bar code recovery recognition, misread rate of 61 million parts, two-dimensional bar code also has a large amount of storage, damage resistance, high security, fax and photocopying, data hiding, good information Products go and other characteristics.

With the development of science and technology, many new types of barcodes have been developed today, such as invisible barcodes (including covert invisible barcodes, invisible inks, and photochemically processed invisible barcodes), metal barcodes, and watermarked magnetic codes, all of which enhance the use of barcodes. Depth and breadth.

Second, the technical requirements of the bar code

Original negatives printed with barcodes must be registered and issued by an international or national coding center. To make the bar code be correctly identified by the bar code recognizer, it is required that the bar code be straight, not broken, the edges of the lines should be smooth and sharp, no jaggies should appear, the distance between the lines should be in line with the standard, the line blackness should be sufficient, and the contrast should be large. The technical requirements for barcodes are:

(1) Size scaling. Barcodes are usually the direct printing of large originals, but to enlarge or reduce the printing according to the technical requirements of EAN organization, can not be carried out, general provisions of its scaling ratio should be controlled at 80% to 200%. The bar code zoom rate has a great influence on the printing pass rate. When the zoom magnification is 100%, the pass rate is 97.3%; the zoom ratio is 90%, the pass rate is 95.7%; the zoom ratio is 85%, the pass rate is It is 25%; while the zoom ratio is less than 80%, the print pass rate is only 10%. Therefore, zoom printing is preferably performed by the provision mechanism of the barcode film.

(2) Color matching. Since the bar code reading system provides that the general scanner light source is a red light source with a wavelength of 630 to 700 nm, the red light effect of ink should be considered.

The incident light of the scanner is irradiated on the surface of different color barcodes, and different effects of reflection may occur. Black ink can completely absorb red light. The reflectivity of incident light is less than 3%. It is the safest and most ideal bar code color. White ink is completely reflective to red light, and its reflectance to incident light is close to 100%. % is the safest blank color, so bar codes are generally printed in monochrome.

In the packaging and printing, in order to increase its decorativeness, it is often the case to choose other colors and empty spaces. At this time, it is necessary to pay attention to choosing the right mix according to the red effect of the color. There are yellow, orange, red, etc. colors with high red reflectivity, and green, purple, and other colors with low red reflectivity. As long as the bar code can meet any reflectance, scan density, and any color combination required by the print contrast PCS value, it is a reasonable bar code printing color design. (to be continued)