Bar code quality directly affects the use of bar codes, bar codes meet quality requirements not only fail to improve management efficiency, it will cause confusion. In recent years, although a certain degree to improve the quality of the bar code, but the goods are due to poor quality bar codes and supermarket shut examples have also occurred. Therefore, improving the quality of the bar code on the manufacturers and sellers are very important.

Barcode printing looks very simple, it does not have intricate patterns and beautiful pastel colors, so some companies that its printing requirements are relatively simple, it is not true, due to the combination of empty bar barcode containing specific information, and by the particular reading device reading, therefore, barcode printing precision bar-space size, color matching, printing location, there are stringent regulations. details as follows:

  1. Barcode bar high

     The height of the bar code can be truncated in principle, should be consulted on the Bar Code art Ruoyin placement is not enough to be truncated.

2. Barcode blank area around

     When scanning a barcode scanner, a low level reset signal to have a certain width, determine the start and end of the bar code is scanned, so the blank area to the left and right corners of the film in accordance with the standard dimensions shown enough to stay, otherwise it will be difficult or even bar codes can not be reading.

3. Printing materials

 When printed bar code symbol in transparent materials (such as plastic, glass, etc.), not only printed bar color, printed without the background (the color space). Otherwise, the scanner can not collect empty reflected signal can not be read. Thus, the bar code printed on the transparent material must first be pre-printed background.

 4. Ink requirements

 Ink colors should take full account of the ink color cast, ink color cast affect the accuracy of barcode great. Theoretically Just follow the color matching using barcode printing inks can meet the requirements, but because of the existence of the printing ink hue impure defects, leading to occurrence of color cast. Therefore, it should accurately control the use of color ink, the ink density, hue saturation, high purity, preferably before the first bar code printing ink reflectance measuring some red light whether meet the requirements. Reflective gold ink and gloss properties result in specular reflection effects, affecting the scanner reading, it can not be used for printing bar codes. In addition, the thickness of the ink and ink concentration should also be suitable for barcode printing requirements, since the bar code printing is the printing field, its optical properties can be achieved reflection print density of ink and ink layer thickness. Printing process, the printing reflection density is increased with the increase in the thickness of the ink, when the ink thickness reaches a certain value, then the density reaches saturation. General ink saturation density requirements: black ink 1.8 to 2.0; cyan ink of 1.45 to 1.70; magenta ink is 1.25 to 1.50; 0.90 to 1.05 yellow ink; Professional inks 0.8. Due to differences in the printing process on the printing ink layer thickness is different, generally offset of 2 ~ 4μm; letterpress is 8μm; Flexography is 10μm; Gravure is 12μm; silkscreen 30μm.

5. Requirements substrates

 Since bar code readers, its scanning light source is incident at an angle 45 °, and the reflected light collection angle of 15 °, when the reflection light is 15 ° range, can not collect the reflected optical signal, i.e., the effect is equivalent to black. Therefore, in order to satisfy this characteristic bar code scanning, requires substrates with good light scattering properties, and not specular reflection. Therefore, the paper white matter, opacity and gloss how the bar code readers have a certain impact. It should also consider using good weather resistance, dimensional stability after the force, good color, small ink permeability, moderate smoothness and finish materials.

6. Article empty colors.

 Article empty color matching, must ensure that the color contrast empty strip large enough. Color of the bars can be: dark blue, dark green, dark brown, black, empty of color may be red, orange, yellow, white, black and white with which the best qualities of metal materials (such as gold, silver) are not suitable for bars or empty color.

7. Printing position

 Select a product bar code according to the different forms of packaging placement shall meet the requirements of the scanning device scans. It should be noted, with the edge of the package bar code must, overlap, folds or corners where at least a distance of 5 mm in order to avoid the bar code is subject to wear, with the cover or packaging deformation, resulting in problems when scanning reading. If a production of tofu, bar code identification on their bags in the bag when not installed can read in kind, but the kind of bag fitted, after vacuum packaging process, the bar code due to improper location may wrinkle deformation can not read . Therefore, enterprises should be based on the actual sales of goods to determine its barcode printing position.

8. Barcode size

 According to the size of product packaging and allows printing area, according to the standard bar code within the range of 0.8-2.00 times the size of the barcode magnification factor selection. (Means standard bar code barcode amplification factor is 1.00, with dimensions of 37.29 * 26.26 mm).