The main printing methods for barcodes are as follows:
Barcodes can be printed in a variety of ways, including lithographic, gravure, relief, and non-printing (inkjet).
First, the main aspects of printing quality are:
(1) Controlling the size error of the bar code is to improve the first reading rate of reading and to reduce the error rate of translation. This requires both the quality requirements for plate making, printing or printing, as well as the tolerance requirements for reading devices.
(2) In order to ensure correct scanning, the printed barcode should be neat and clear. There is no obvious defect (defect), and there are no residual black spots (stains). Generally, the maximum diameter of the defects and stains should be ≤ the narrowest. The bar code is nominally 0.4 times.
(3) The printing tolerance must be strictly controlled during printing, otherwise the reading effect will be affected.
(4) For reliable reading, the strips and spaces in the bar code after printing should have obvious contrast signals. The larger the contrast signal of the bar code, the better the performance of reading.
(5) There are certain requirements for the edge roughness of the bar code. When the roughness is too large, it cannot be read.
(6) The thickness of the strip and the empty ink layer in the bar code should generally be controlled within 0.1mm. Otherwise, the correctness of the reading will be affected by the different scanning planes.
Second, in order to ensure the quality of bar code printing, there are certain technical and material requirements for the printing process, mainly:
(1) Size scaling. The bar code is usually printed directly from the original, and it is best to do it by the mechanism that provides the bar code film.
(2) Requirements for substrates. In terms of optical properties, the substrate is required to have good light-dispersion characteristics, and specular reflection cannot occur. In terms of material dimensional stability, materials with good weather resistance, stable dimensional force, moderate ink expansion, good colorability, low permeability, moderate smoothness and smoothness should be selected.
(3) Color matching. Ink color is a safe bar code color, and white ink is the safest blank color. When selecting other colors to print the bar code, pay attention to selecting the appropriate color match according to the red light effect of the color.
(4) Printing related requirements for ink. When considering the color of the ink, we should consider various conditions such as the color shift of the ink. Since bar code printing is solid printing, the reflection density that can be achieved by printing is related to the optical properties of the ink and the thickness of the ink layer. During the printing process, the reflection density of the printing increases as the thickness of the ink increases, and when the thickness of the ink reaches a certain value. After that, the density is saturated, so pay attention to the concentration of the ink and the thickness of the ink layer. In addition, it should also be noted that the viscosity of the ink should not be too low, and the amount of ink supplied during printing should not be too large, which will affect the accuracy of bar code printing.
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