CY/T 261-2022 in English

This standard systematically specifies the quality requirements of inkjet printing equipment in the production of variable two-dimensional codes for the first time, focusing on solving the problems of low reading rate and poor durability of two-dimensional codes in the packaging industry. The standard is applicable to paper QR code printing, and other media can refer to it.

5.2.2 Specification and size requirements

The standard innovatively proposes an inkjet dot expansion compensation algorithm: module width = inkjet dot number/device resolution (dmm). For example, when a 600DPI device sprays 2 ink dots, the module width = 2/(600/25.4) = 0.085mm.

5.4 Ink performance

The ink must not be clogged in the print head protection cover for 72 hours, pass the HJ 567 environmental certification, not fade after 80 frictions, and meet food packaging safety requirements.

1. Equipment Calibration: It is recommended to calibrate the positioning accuracy and ink drop volume of the inkjet printer with a standard test chart every week
2. Process Control: Sample 3% of products in each batch, focusing on monitoring the AN (axial inconsistency) and GN (grid inconsistency) indicators
3. Environmental Management: Maintain the workshop temperature at 23±2℃ and the humidity at 50±5% to reduce ink evaporation

Compared with the general requirements of GB/T 23704, this standard adds:
1) A special chapter stipulates the printing characteristics of variable data
2) Appendix A gives the QR code size calculation formula
3) Clarify the application specifications for special scenarios such as tobacco packaging