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1. Improper color matching
Barcode reading is based on the different reflectivity of light irradiating the bar and the space. The light source of the bar code scanning equipment is mostly red light. Therefore, the white and black bar code is the easiest to read. In order to reduce printing costs, some books and periodicals only print one color on the cover: red, yellow, or orange, so that the barcode is also printed as a red stripe on a white background, a yellow stripe on a white background, and an orange strip on a white background, which makes the scanning device glow red. The reflectivity irradiated on the bar and the space is almost the same, making it impossible to read; some book cover designers do not understand the principle of bar code reading, printing black bar codes on dark blue, dark green, dark brown covers or printing bar codes on Where there are pictures on the cover, the printing contrast (pcs value) of the barcode is very small, making it impossible for the scanner to read it. In this case, as long as the background color of the bar code printed on the cover is hollowed out to white during plate making, and then printed with a black bar code, the bar code can be read.
In order to ensure the printing quality of the bar code, the color of the bar should be black, dark blue, dark green, brown, and the empty color should be white, red, yellow, orange. These 16 kinds of collocations are the best choice. To understand the role of light absorption and reflection, the color of the bar must be able to absorb red light, so that the bar's reflectivity is low; the empty color must reflect red light, so that the empty reflectivity is high. The maximum value of the bar reflectivity does not exceed 25%, the minimum value of the empty reflectivity is not less than 96%, the bar code printing contrast (pcs value) is 67% to 98%, and the bar code scanning instrument can read it correctly.
2. Scaling the barcode size arbitrarily
For some books and periodicals, because the format is small (64 pages) or there are too many pictures on the cover, there is not enough space to place the bar code, so the size of the bar code will be reduced at will, causing the space to be too small or the bar to be too thin, making the scanner unreadable. Therefore, when the bar code needs to be reduced, the book bar code administrative department must use special equipment to make the reduction code, and it can only be reduced to 80% of the conventional bar code.
3. Make your own bar code film
For some books and periodicals, the barcodes are lost, so you can make a bar code yourself or copy the barcode from the original book and then take it to make a plate. This method is not allowed. The quality of the self-made bar code film or the copied bar code itself is unqualified, so the books and periodicals bar coded and printed must be unqualified. If the bar code film is lost, you must apply to the book and bar code administrative department for making bar code film again.
4. Improper selection of printed paper, ink and equipment
The gap between the barcode and the barcode is very small. If the printing paper, ink and equipment are not properly selected, it will be easy to paste when printing. The barcode will become thicker and thinner. When the deviation of the barcode width exceeds ± 30%, the scanner cannot read it. Therefore, it is better to choose offset printing for bar code printing of books and periodicals, and choose paper with less paper wool such as coated paper and offset paper. The roller pad should not be too soft during printing, and the fluidity of the ink is moderate to ensure that it does not paste. When printing bar codes, it is necessary to ensure that the bar is clear, the size is accurate, the bar width deviation and the printing contrast are within the specified range, so as to become a qualified product for book and bar code printing.
With an experience of over 30 years, Helper created a new subsidiary who produce bakery and pastry making machines which is applied in the processing of noodles, dumpling, pancake, bread, biscuits, Saqima, hamburgers, pizza, steamed buns, etc. Reliable quality and many patent technologies make Helper`s equipment success in this particular market. Made of stainless steel and meeting all health and hygiene standards is the principle of Helper`s machine designing.
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