Barcoding and printing should pay attention to the problem

The barcoding of products has greatly improved the efficiency of the logistics links such as delivery, purchase, inventory and sales of goods. In order to enter the domestic market and the international market, China’s commodities must be bar coded, and the scanner can read it correctly. It has high requirements for plate making and printing. The issues that should be paid attention to in bar code plate making and printing are: bar code printing size during plate making. Depending on the size of the area on which the bar code can be stored on the printed label or package and the specific printing conditions. In the case of permission, the bar code standard size should be 37.29×26.26mm and the zoom ratio should be 0.8 to 2.0. It is not allowed to arbitrarily reduce the zoom factor of the film, or to arbitrarily reprint, to increase the printing size error, so as to ensure the uniqueness of the product code. . The height of bar code symbol shall not be arbitrarily shortened. For some special cases where the product packaging is small and the printing area is not enough, the state allows the height of the bar code symbol to be properly truncated, but the remaining height is not less than 2/3 of the original height. The characters of the bar code characters are printed in the shape of the OCRB character set in the national standard GB12508. The printing position shall be printed in accordance with the provisions of the national standard GBT14257-1993 “Location of General Product Bar Code Symbols”. There are specific requirements for the bar code, box, canned, bottled, canned, and bagged printing locations. Cannot be placed on corners, seals, or joints of commodity packaging, or on special-shaped packaging with obvious irregularities. Barcode symbols should be printed in the best position for scanners to read, and barcode symbols should be guaranteed. The size of the blank area outside the left and right ends of the start and stop symbols is sufficient to ensure that the prompt scanner is zeroed. Printing colors usually have a white or light color background, black or dark lines, see the attached table, the contrast between the background color and the line density> 0.5, the print contrast is qualified ≥ 60%, the lower the reflectivity of the bar code, the better, empty The higher the reflectivity, the better.
Pay attention to the printability of the bar code, use the dimensional stability, good color fastness, moderate ink diffusion, leakage, smoothness, good finish, coated paper, white cardboard and other printing. The direction of the bar code should be consistent with the printing direction in order to ensure the printing quality. Select the ink that matches the printing paper. Pay special attention to the uniformity and diffusivity of the ink. Ensure that the height of the line and the copy line of the paper after bar code printing is not greater than 0.1mm, the difference between the density of the background color and the line color is greater than 0.5. Before batch printing, conduct bar code printing suitability test, and then according to the national standard GB2828 sampling, send the local bar code quality testing department to test, after the quality is qualified, can be printed in batches. When making a block, it is best to use the bar code original operation. In the process of copying, copying, printing, proofing, etc., it is necessary to control the guarantee that the width and width of the blank should be within the allowable error range, and the error is only allowed to be 12%~ Between 39% prevents deformation and errors. The bar code for printing should first have a bar code printing qualification license approved by the local bar code management agency, ie "system member certificate".
It is required that the direction of the paper fibers of the bar code be consistent with the direction of the bar code, and papers with extremely small changes should be used so as to reduce changes in the bar and space. The printed strips are prominent, deep, solid, non-broken, distorted, stained, small stains smaller than 40% of the strip width, and printed ink thickness not exceeding 0.1 mm. The printed bar code surface is clean, no obvious dirt, wrinkles, damage, perforation, fuzzy, numbers, letters, special symbols printed complete, clear, no significant deinking, the edges of the bar is neat, no obvious bending deformation, uniform ink, No significant difference. Grasp the pressure of printing and the balance of ink and ink to ensure that thin strips and numbers are clear and ink-colored. Printing product barcodes according to national standards to ensure barcode printing quality.
In short, according to the ISO9002 standard in plate making and printing, establish and improve the bar code quality assurance system, strictly in accordance with the national standard GB/T14258-1993 "Check the quality of bar code symbol printing", so that bar code quality management throughout the plate, printing, inspection and supervision In such links, the quality of barcodes will be improved, the process of domestic commercial automation management will be promoted, the export of commodities will be guaranteed, and the economic benefits of printing companies will be increased. (Text / Zheng Xiaoming)
(From China Packaging News, February 1, 2000)