Barcode Printing Technology Solutions for Plastic Packaging (1)

Barcode technology is an automatic identification technology developed and developed in computer application practice. Since the advent of the 1960s, it has demonstrated a strong vitality and has developed rapidly. After more than 30 years of continuous improvement, improvement and development, it has been widely used in many areas such as commodity circulation. So far, there are more than 60,000 enterprises that have been allowed to use bar codes in China, and 500,000 kinds of commercial items have been identified using commercial bar codes. There are thousands of chain stores, warehouse supermarkets, and distribution centers that use business package automation technology to manage product automation.

Bar code printing technology is one of the important contents of bar code technology. With the large number of barcode technologies used in food and daily chemical products in China, the plastic packaging manufacturers that are supporting them must adapt to the development of this situation. According to relevant departments, there are many bar code printing failures on the market. Bar codes that do not meet quality requirements will not only fail to improve management efficiency, but will cause confusion. (Foreign large retailers have clear penalties for the quality problems of supplier bar codes.) Therefore, it is necessary to thoroughly study the barcode printing technology of plastic packaging. This article will initially discuss some of the issues and communicate with peers.

First, the main technical indicators of barcode printing

The specific standards for barcodes have been detailed in the national standard GB12904-91. Among them, printing technical indicators mainly include three aspects: width tolerance; appearance (including stains, porosity and edge roughness, etc.); reflectance and contrast.

1. Width tolerance

Since bar codes use different widths of bars and spaces to represent information, if the printing errors of bars and spaces are not strictly controlled, there may be problems such as the width of a narrow strip (empty) being close to or the narrow space almost disappearing. This can make the bar code symbols unreadable or have a large number of errors. Therefore, the sum of the width and the width of the bar and the space and the sum of the width and the accuracy are the key to ensure that the decoder can receive the correct waveform and perform the decoding correctly.
The bar code width tolerances are mainly the blank width tolerance, the width tolerance between the edges to similar edges, and the character width tolerance. It describes the allowable error range of the strip and the space width in printing. If it exceeds this range, it will affect the reading effect.

2. Exterior

(1) Whether the surface is damaged, cracked, perforated or smeared.

(2) The surface has no dirt, ink lines, uneven ink and other phenomena.

(3) Whether it is too close to or overlap printing with other patterns.

(4) Stain, porosity, and edge roughness.

In the process of printing a barcode, for some reason, voids (deinking) sometimes occur in the air of the bar code symbol or in the ink in the bar. The bar code allows any number of stains and voids (deinking), but the following conditions should be met:

1 Its area does not exceed 25% of the circular area with a diameter of 0.8X.

2 Its area does not completely cover a circle with a diameter of 0.4X.

Where X is the width of the narrowest cell.

The requirement of the edge roughness is that the elements on all possible scanning trajectories can meet the requirements of printing dimensional tolerances.

3. Reflectance and contrast

Contrast (PCS) refers to the ratio of the difference between the null and bar reflectivity and the null reflectivity. The reflectance and contrast (PCS) values ​​should comply with the corresponding regulations.

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