Decoding the Standards: How Is the ISO / IEC 15415 Test Performed?

An in-depth look at the ISO / IEC 15415 standard for bar code quality inspection, with a detailed description of the core steps in bar code testing and the common problems encountered.From equipment selection to parameter analysis, it helps companies to master the methods of barcode grading, ensuring that products meet international standards and improving the efficiency and readability of the supply chain.

Why is ISO / IEC 15415 testing necessary?

If the quality of the printing is poor, a scanner may have difficulty reading the barcode. In the worst cases, this could lead to a breakdown in logistics or even to returns.ISO / IEC 15415 is a standard specifically for testing the quality of two-dimensional barcodes (such as Data Matrix). It allows for systematic evaluation of key indicators such as the contrast and sharpness of the barcode, providing a kind of "health report.

Preparing for the test.

Environment and equipment.

Don't think you can just grab any old scanner and go! You need one with a standard light source, and environmental light levels must be controlled to within ± 10 % error.The best background for the testing platform is matte black, to avoid any glare that might interfere with the results.

The key points of sample handling.

The test sample cannot have any creases or stains, especially reflective labels (such as metal surfaces). Remember to let the ink cure for 24 hours before testing.For roll labels, at least 5 meters of material must be removed from both the beginning and the end of the roll before testing.

A detailed look at the core testing steps

Parameters must be set accurately.

Once the device is opened, the light source must be adjusted to the proper angle, which is 45 ° ± 2 °.Resolution is adjusted according to the smallest unit in the barcode. It is generally recommended to be 1 / 3 or more smaller than the smallest unit.

Don't be careless about the assessment.

Each barcode is scanned at least three times, with the worst result being taken as the final rating.The "honeycomb defect" is particularly important. These are the little white spots that look like they have been nibbled by bugs. This problem is especially common in metal etched barcodes.

The results of the test are then interpreted.

You don't need to be intimidated by the A-F rating system. Just remember that a grade of C or above is acceptable, but grades of B or higher are more reliable for high-speed production lines.If the "edge contrast" fails, it is almost certainly because the pressure of the press is not properly adjusted.

Solutions to common problems.

What if the reflective material always fails?

Try applying a matte coating to the surface of the barcode, or using a special ink with a high absorption rate.One client was able to raise its pass rate from 52 % to 89 % using this approach.

Weather conditions affect the results.

Changes in temperature and humidity can cause the tags to deform slightly. In the south, where it rains a lot, it's best to calibrate the equipment twice a day.I've run into a case where a food factory's warehouse was too damp, so that all the barcodes that had been tested and approved were downgraded after just a week on the shelf.

I couldn't understand the test results.

The two most important parameters are "symbol contrast" and "modulation ratio." If the symbol contrast falls below 30 %, the label is definitely unacceptable. If the modulation ratio fluctuates by more than 15 %, then it is time to service the printer.If you really can't figure it out, ask the equipment manufacturer for a parameter comparison chart. They all have a ready-to-use fault tree analysis chart.