There are many reasons, as follows:

I. Barcodes are deformed. Barcodes are a relatively new symbol system, and various code systems have a corresponding ratio.

2. The barcode bars occur vertically. Generally, when the bar code printer is printed with the label, it occurs when printing the code label. Printing head breaks and carbon belt wrinkles are the main reasons.

3. The width of the barcode blank area is insufficient, and the gap between the left and right blankness of the barcode must be at least 10 times that of the narrow bar width.

4. There is a problem with the colors of the barcode and the empty color of the barcode. The difference in barcode reading depends on the color of the bar. The color of the high reflection rate will be identified as empty. The barcode can be read. The barcode of the black bars can be read. The barcodes of the yellow bottom purple bar can be read. Generally, the barcode of the red barcar of the white background cannot be read.

5. Barcode printing effect is not clear, usually because the medium does not match or the printing concentration value is set too low.

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