The use of a one-dimensional bar code of a product must be a member of a one-dimensional bar code system certified by an international or national code center. A company that prints a one-dimensional bar code must apply for a one-dimensional bar code printing certificate. In order to ensure correct and rapid reading of one-dimensional barcodes, the correctness of one-dimensional barcodes, symbol consistency, minimum reflectivity, symbol contrast, minimum edge difference, modulation ratio, defect degree, decodability, blank area width , magnification factor, bar height and print position are all issues that need to be identified and considered.
1. Correctness of decoding
The correctness of decoding is the fundamental characteristic of a one-dimensional barcode. In the printing and plate making, the one-dimensional barcode must be generated by the special one-dimensional barcode making software, and the generated file must be a vector file, which cannot be a picture. Otherwise, the degree of decoding and correctness of the one-dimensional barcode is greatly affected.
2. Symbol consistency
Symbol consistency is a characteristic that the code represented by the one-dimensional bar code symbol is consistent with the human-identified character of the one-dimensional bar code symbol, and is one of the other fundamental characteristics that the one-dimensional bar code symbol should have. If the code represented by the one-dimensional bar code symbol is inconsistent with its human-recognized character, the human read information and the machine-readable information of the one-dimensional bar code symbol are different, and an error occurs.
3. Minimum reflectivity
The minimum reflectance is the scanning reflectance. The reading system specifies that the wavelength of the general scanning light source is 630-700 nm, so the red light effect of the ink color should be considered. Black ink can completely absorb red light, and the reflectivity of printed matter to incident light is below 3%, which is the safest one-dimensional barcode color; white ink is completely reflected on red light, and the reflectivity of printed matter to incident light is close. 100% is the safest blank color, so one-dimensional barcodes are generally black and white. However, in order to increase the decorativeness of the product label , it is often used with other color oils. At this time, pay special attention to the red light effect of the ink. Yellow, orange, red, gold, etc. with high red reflectance are easy to be short, and green, purple, and dark brown with low red reflectance are easy to make.
4. Symbol contrast
The sign contrast is the difference between the highest reflectance and the lowest reflectance of the scan reflectance curve. The symbol contrast is large, indicating that the bar and the color are matched properly or the reflectivity of the substrate and the ink meets the requirements; if the sign contrast is small, the reason should be found in the strip, the color matching, the printing material and the ink.
5. Minimum edge contrast
The edge contrast is the difference between the empty reflectance and the strip reflectance of adjacent cells on the scan reflectance curve. The symbol contrast and the minimum edge contrast are too small to cause the one-dimensional barcode to be difficult to read, which is usually caused by the substrate and ink.
6. Modulation ratio
The modulation ratio is the ratio of the minimum edge contrast to the sign contrast. In general, the modulation ratio is too small, and the scanning of strips and spaces is difficult to distinguish. The modulation ratio causes the one-dimensional barcode to be difficult to read, usually due to the printing material or ink, the ink is printed on the printing material, the edge of the strip is chopped or spread, or the ink volume is insufficient, which will result in unclear and ghosting of the one-dimensional barcode. Paste and so on.
7. Defect degree
The degree of defect is the ratio of the maximum unit reflectance non-uniformity to the sign contrast. Generally speaking, the degree of defect is caused by the quality of the printed appearance. When the one-dimensional barcode has large particles such as dirt and deinking, the one-dimensional barcode is difficult to read.
8. Decodability
The decodability is a parameter related to the one-dimensional bar code symbol strip/empty width printing deviation. A one-dimensional bar code reading device should read a one-dimensional bar code symbol with a large degree of descriptibility, and it should be smoother than a one-dimensional bar code symbol with a small degree of descriptibility.
9. Magnification factor
In general, the smaller the magnification factor of the one-dimensional barcode, the stricter the requirement for the strip/space size deviation, and the more difficult the printing. For one-dimensional barcodes with an amplification factor of less than 0.80, the print quality is not easy to guarantee, and it is easy to cause difficulty in reading. A one-dimensional bar code symbol with a magnification factor greater than 2.00 occupies a large area of ​​the product package, and some reading devices, such as a CCD reader, have a limited reading width, which is liable to cause difficulty in reading. Therefore, the magnification factor of the one-dimensional bar code of the product should be 0.80 to 2.00.
10. Blank area width
The role of the blank area is to provide "start data acquisition" or "end data collection" information for the reading device. The insufficient width of the blank area often causes the one-dimensional bar code symbol to be unreadable or even misread, so the width of the blank area should be Guarantee. For example, when the magnification factor is 1.0, the minimum widths of the left and right margins of the EAN-13 code are 3.63 mm and 2.31 mm, respectively, and the minimum width of the blank areas on both sides of the EAN-8 code is 2.31 mm.
11. High
The lower the height of the one-dimensional bar code, the higher the requirement for the scanning line to aim at the one-dimensional bar code symbol, and the lower the scanning reading efficiency. Therefore, in design, the height of a one-dimensional barcode is higher than that of a scan line.
12. Printing position
Whether the printing position of the one-dimensional barcode on the package meets the requirements directly affects the reading rate of the one-dimensional barcode, such as whether there are perforations, punching cuts, drawing strips, seams, folding, folding, overlapping, corrugation, bulging Whether wrinkles, other graphics, etc. cause damage or obstruction to one-dimensional bar code symbols.
The above content is selected from the fifth volume of the Label Technology of Keyin Media . For more journal content, please pay attention to the journal channel. The latest journal content clicks into the electronic journal channel of Keyin.com.
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