Common reasons and treatment methods for the two-dimensional code cannot be scanned in UV printing

Table Of Contents

1. Pay attention to the distance between the phone case and the nozzle

In UV printing, the distance between the print head and the material being printed on is critical for achieving high-quality results. This distance, also known as the “gap” or “height,” affects the ink droplet size, shape, and placement on the surface of the object being printed. When printing on a flat material such as a phone case, maintaining a consistent gap of 0-5mm is essential to prevent issues such as barcode distortion, smudging, or scratching.

2. Parameter adjustment when the material changes

Different materials require different printing parameters, including resolution, nozzle temperature, curing time, and ink type. For successful UV printing, it is necessary to test the printing parameters for each new material before mass production. Printing tests allow technicians to adjust the technical parameters according to the specific characteristics of the material, such as its texture, heat resistance, and lightfastness, to ensure that the final output meets quality standards.

3. Eliminating the lack of a backspace

The QR code is a two-dimensional barcode consisting of black and white squares arranged in a specific pattern. The backspace of the QR code refers to the amount of white space around the black bars. Without sufficient backspace, interference from other colors and patterns can disrupt the scanning process, rendering the QR code unreadable. To avoid this issue, designers and printers must pay close attention to the dimensions of the backspace when creating QR codes.

4. Preventing the wrong color combination of bars

The color combination of the bars in a QR code must meet certain requirements to ensure accurate scanning. For example, the amount of white (empty) space between the bars must be greater than or equal to the width of the narrowest bar. Additionally, the contrast between the bars and their surroundings must be high enough to allow for easy detection by scanning devices. To prevent issues with color combinations, printers should follow established guidelines or perform test prints before mass production to identify any potential problems.


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