What is a product barcode
1. Product barcode:
Commodity barcodes are global barcodes used to identify commodities in the field of circulation. Commodity barcodes consist of a set of regularly arranged bars, spaces and their corresponding characters, indicating certain information. The bar code and empty combination part of the product barcode is called a bar code symbol, and the corresponding symbol part is composed of a group of Arabic numerals called a product identification code. The bar code symbol corresponds to the bar code, and the information expressed is the same. The bar code symbol is used for scanning and reading by bar code reading equipment, and the bar code is for human reading. National standards stipulate the coding, structure, size and technical requirements of commodity barcodes.
2. Types of commodity barcodes:
Product barcodes include EAN barcodes and UPC barcodes. GB12904 is mainly formulated based on EAN application specifications, and China promotes the application of EAN barcodes. UPC barcodes are mainly used in the United States, Canada and other countries. China's exports to the United States and Canada of food, medical care products need to apply for the use of UPC barcodes.
3. The code structure of commodity barcode:
Commodity barcodes include EAN-13, EAN-8, UPC-A and UPC-E. EAN-8 and UPC-E commodity barcodes are used for special commodity packaging with a small area. The digital code of the EAN-13 commodity barcode is composed of three parts: the manufacturer's identification code, the commodity item code and the verification code, with a total of 13 digits. Among them: the first three digits are called prefix codes, which are uniformly assigned by EAN to the coding organizations of various countries (regions); the manufacturer identification code is uniformly assigned by the China Commodity Coding Center to each applying manufacturer, and the manufacturer identification code of each manufacturer is different Unique in the world.
Fourth, the unique principle of commodity barcode coding:
The commodity item code of the commodity barcode is compiled by the manufacturer itself, and represents the information such as the category, specification, and packaging form of the commodity. According to the stipulation of the uniqueness principle of the preparation of commodity item codes in GB12904-2003: the same commodity identification code should be assigned to the commodities of the same commodity item. Commodities with the same basic characteristics are regarded as the same commodity item, and commodities with different basic characteristics are regarded as different commodity items; commodities with different commodity items should be assigned different commodity identification codes. [next]
5. The left and right blank areas of the product barcode:
The blank area on the left (right) side of the commodity barcode indicates the start and end of barcode reading. GB 12904 specifies its minimum size. In application, the blank area on the left (right) side of the product barcode must not be less than the standard requirements, and there must be no characters, graphics, stains, scratches, etc. in the blank area to ensure that the barcode can be read correctly.
6. The size of the product barcode:
The size of the product barcode is expressed by the amplification factor. Since the barcode scanner can only scan barcodes of a certain length, the standard specifies that the amplification factor must be selected within the range of 0.8 to 2.00.
Seven, color matching of commodity barcode:
The greater the contrast of the bar code and empty color of the product bar code, the easier it is for the bar code scanner to read the bar code. GB-12904 has made strict regulations on the color matching of barcodes: the reading of commodity barcodes is realized by distinguishing the borders and widths of the empty spaces. Therefore, the greater the contrast between the colors of the barcodes and the empty spaces, the better. The bar color should be dark, and the empty color should be light. White is empty, black is the ideal color match.
What is an electronic supervision code
"Electronic supervision code" is a set of variable digital and variable barcode, each product has a different "supervision code".
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