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What should be paid attention to when printing QR codes on packaging bags?
Release time:2019-06-29
We scan QR codes every day. Today, let's discuss what to pay attention to when printing QR codes on packaging bags, with Shunxingyuan Packaging, a professional manufacturer of flexible packaging. QR codes can be monochrome black or multicolor overprinted. Therefore, the factors affecting the printing quality of QR codes are mainly color contrast and misregistration.
Everyone scans QR codes every day, so, today Shunxingyuan Packaging, Professional Flexible Packaging Manufacturer Around Let's discuss the topic "What to pay attention to when printing QR codes on packaging bags". A QR code can actually be single-color black, and it can also be multi-color overprinted. Given this, the main factors affecting QR code printing quality are color contrast and registration errors.
I. Color Contrast
Packaging Bag Insufficient color contrast of the QR code on the packaging bag will affect the mobile software's recognition of the QR code. Optical characteristics requirements for barcode printing symbols: For reliable readability, after printing, the lines and spaces in the barcode should have a clear contrast, with the reflectance of the spaces being as large as possible and the reflectance of the lines being as small as possible. According to national standards, the whiteness of domestic newsprint is above 50%, and normal printing can meet the QR code recognition requirements. At the same time, it is important to note that when creating QR codes on newspapers, be sure to remind editors not to add background patterns to prevent insufficient contrast from affecting readability.
II. Registration Error
This mainly refers to colored QR codes. During printing, it must be ensured that the QR code is neat and clear. Generally, we specify that the maximum value of the registration error (the registration error between the main color and the image) should be less than or equal to the nominal width of the narrowest barcode line by 0.4 times.
According to national standards, the registration error for newspapers should be less than or equal to 0.3mm. In practice, some newspapers at the provincial level and above, with more advanced printing equipment and higher quality requirements, can fully meet this standard. For some city and prefectural newspapers, if registration is unstable, it is recommended to print QR codes in a single color to avoid registration issues.
III. Missing Printed Elements
During printing, be careful not to lose elements on the printing plate to avoid difficulty in reading the QR code. In printing, due to issues with the printing plate or blanket, printing pattern defects can easily occur. Special attention should be paid to this type of QR code, as it is a somewhat "fragmented" pattern.
IV. Printing Ink Color Issues
To control the dimensional error of QR code symbols, the key to printing is to control ink color and printing pressure to ensure accurate restoration of QR code stripes. Under normal circumstances, we should ensure that the ink is "light in water and ink", while ensuring the necessary ink layer thickness. Avoid uneven stripes caused by insufficient pressure or ink, and avoid stripe diffusion caused by excessive pressure or too much ink.
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