The hottest label application on another use of ba

2022-08-11
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Application of labels: another use of bar codes (Part 1)

almost every packaging magazine or any conference on packaging and product distribution talks about replacing bar codes with RF labels. This article will help printers and print buyers develop another use of bar codes, that is, as a reference for checking printing quality. You may think that this proposal has its own limitations, because bar codes can only be printed in monochrome, and most carton enterprises have more than one printing color. Anyway, if you have a barcode checker, you can easily realize this idea. However, it is worth noting that bar code readers alone are not competent for this task

history

bar codes originated in the 1970s and have various design patterns. However, all bar codes are composed of printed strips, and the coding principle of these strips is based on the width and spacing of the strips. Almost any goods packed in cartons are printed with bar codes. Today, bar code has become the main tool to identify products in the supply chain<6. When the granulator was operated/p>

in 1995, some problems were encountered: the bar code printed on the corrugated box sometimes could not be read. At that time, customers thought it was a printing problem, but in fact, carton enterprises have produced products of the same quality for many years. Later, it turned out that those customers only began to use bar codes in large quantities at that time, and the printing factory did not verify those bar codes, so it was not aware of the problems

because you need measuring instruments to provide quality assurance for the readability of bar codes, the printed bar codes still cannot be properly verified. Some printers are equipped with bar code readers, but this only means that bar code readers can read bar codes. Therefore, bar code verification has become a topic of concern in the carton industry. As we know, bar codes may disappear from the packaging, but bar code verification equipment is still useful in analyzing the printing process

problem

after the introduction of bar codes, people found that the printing process affected the actual bar width of bar codes. The printer found a solution to compensate for the widening of the strip in the bar code sample, that is, to reduce the width of the strip. When checking the bar code with the bar code verifier, the verifier will give the average bar widening value for all the bars in the bar code. We are interested in this value

if the bar code lists the thickness, thermal performance and other index widths of vacuum insulation board, rigid polyurethane board, extruded polystyrene board, molded polystyrene board and so on, which are different from the original design specifications during printing, the bar widening error will occur in the printing process. There are many reasons for this error, such as:

■ raw material characteristics

■ roundness of printing cylinder

■ alignment of rollers in printing equipment

it is very important to check the alignment of the rollers in the printing equipment. It is not always easy to reach the printing pressure point of the printing equipment to check whether the gap width between the rollers is uniform. In fact, many equipment operators did not realize that the printing cylinder was not aligned and continued to adjust the printing equipment to compensate for the defects. If you talk to these operators, they can accurately describe the problems encountered, but they cannot be associated with the gap error between the rollers or the misalignment of the rollers. Therefore, a test method is needed to connect the problems encountered by operators in their daily work with the status of printing equipment. We need to quantitatively estimate the printing effect and link the effect to the specific process

this paper deals with the printing pressure deviation, specifically the embossing deviation

theoretical

the widening of the strip may be due to the change of the embossing pressure, the printing ghosting, the overall indication deviation of the printing roller and the misalignment of the embossing roller

the changing stamping pressure can lead to the overall widening of the strip width. If there is no reference, it is difficult to detect it. You can check whether the pressure setting is the same as that of the last time with the error force generated by imprint 4 and friction resistance, but the specific pressure setting degree can only be determined through the system test

printing ghosting can cause the strip width to increase in the printing direction (the barcode located below in Figure 1) and perpendicular to the printing direction (the barcode located above in Figure 1). When the ghosting problem occurs, the bar code width at the top in Figure 1 increases more

the detection of overall indication deviation is more difficult. When this problem occurs, you need to observe the overall dispersion of the bar widening data. The greater the deviation of the strip widening data, the greater the overall indicated deviation of the plate cylinder and/or the impression cylinder. It can be found that the chromatic aberration in the printing direction is greater than that perpendicular to the printing direction

whether the rollers are aligned or not will have an impact on the widening and dispersion of bar code strips perpendicular to the direction of the equipment. In order to promote the healthy development of the industry, this is what we are concerned about

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