Printing method and quality control of commodity barcode
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It can be seen from the bar code related national standards and bar code printing quality indicators that the bar code of the product is not a simple set of patterns, and the printing quality of the bar code of the product is quite elegant. In order to print qualified bar code quality, it is very important to use scientific and perfect printing quality control.
1. Design of commodity barcode
The design of the product barcode should be based on the predictability of its indicators, such as the uniqueness of the code, the color matching of the strips, the width of the blank area, the height of the strip, the magnification factor, the optical characteristics, and the printing position. Full consideration is given to the fact that each indicator conforms to national standards, while at the same time taking into account the aesthetics of packaging and decoration.
2, print carrier and media
Commonly used packaging materials, such as plain paper, cardboard, plastic film, aluminum foil, tinplate, corrugated paper and some special printing materials can be used as printing carriers for commercial barcodes. However, it should be noted that the use of narrow reflective materials should be avoided when selecting printed carriers, and materials that are transparent, translucent, and poorly colored should be avoided as much as possible. If these materials are to be used for packaging and decorating, the printed bar code shall be surface treated.
In order to ensure the printing precision of the product barcode, a printing material with good dimensional stability, moderate ink diffusion, low permeability, smoothness and smoothness should be selected. For rougher corrugated and woven bags, self-adhesive barcode labels can be used. When printing barcodes on tinplate and aluminum foil, full consideration should be given to their high temperature resistance.
When printing commercial barcodes, you should select the ink that matches the carrier, and pay attention to the uniformity and diffusivity of the ink. The uniformity of the ink is poor, which may result in insufficient oil leakage or ink consumption, which may cause the edges of the printed graphic to be blurred, and stains may appear, so that the strip size of the bar code symbol is out of tolerance. If a specular reflective material or a transparent material is used as the barcode carrier, two inks having completely different absorbivities should be used.
3, commodity barcode film
When customizing or making a product barcode film, consider and check the consistency of the product barcode type (EAN-13 or EAN-8), the identification code on the film, the strip width reduction, the positive or negative film, and the film. Up or down. Which film to use depends on the needs of the plate making process and the process. Usually, the relief and the relief are selected to select the negative film, and the concave and flat intaglio and the stencil are used for the positive film. Direct printing (except for the hole plate) selects the film on top, and directly selects the film with the hole plate and indirect printing.
4, printability experiment
The so-called printability test is to verify the adaptability between the printing conditions (the sum of the equipment, carrier, ink, process, environment, etc. of the printed product barcode), and to determine the strip width compensation of the bar code film and the bar code symbol computer graphic file. Experiments performed on the design parameters such as the amount. The suitability experiment must be strictly carried out according to GB/T18805-2002 "Commodity Barcode Printing Adaptability Experiment". The printing conditions for the bar code printing suitability test should be the same as the printing conditions for the official printed bar code.
5, printing method
According to the plate making form, the printing method can be classified into relief printing, lithography, gravure printing and stencil printing. The characteristics and practice of the printing method prove that the bar code printed by gravure printing and gravure printing has good quality stability and high dimensional accuracy, and is suitable for printing commodity bar codes with different magnification factors, which is the best choice for printing commodity bar codes. The traditional letterpress printing has poor stability and large dimensional error, which is not suitable for printing commodity barcodes. If the packaging and decoration of the goods must be used in letterpress printing, in order to ensure the quality of the bar code, it is recommended to use the lithographic bar code first, and then use the letterpress to print other decorations. The stencil printing can be used to print the barcode of the product in the magnification factor.
6, printing quality inspection
Product barcode symbol printing quality inspection is an important process to ensure the quality of commodity barcodes. The bar code of the product shall be inspected for printing quality before trial printing and finished product delivery. The inspection shall be carried out in strict accordance with GB/T18348-2001 "Product barcode quality inspection".