UV PIJ printers achieve breakthrough color accuracy through precision ink drop control technology. The piezoelectric nozzle array of an industrial UV PIJ equipment can accurately control the ink drop volume of 1.2-35 picolitre, and the ink drop point deviation is ≤±3 microns, 80% lower than the ±15 micron error of the traditional thermal foaming technology. When printing Pantone color cards, its color gamut coverage is increased to 96% from 72% of four-color printing, and the ΔE color difference is maintained within 0.8, achieving the highest certification level of the ISO 12647-2 standard. After a luxury packaging company adopted UV PIJ technology in 2023, the success rate of spot color matching on the metallic substrate increased from 68% to 99%, the annual return loss caused by color difference was reduced by 4.3 million yuan, and the return period of equipment investment was shortened to 14 months.
The instant curing characteristic effectively avoids color offset caused by media penetration. The 395nm LED light source provided with the UV PIJ printer can achieve 99.5% curing degree in 0.01 seconds, whereby the diffusion radius of the ink on the non-absorbent substrate such as PET and glass is confined within 5 microns, compared with 20 micron diffusion of solvent-based ink on coated paper, the dot expansion rate is reduced by 75%. The test by the manufacturer of the film switch shows that the edge sharpness of the 50 micron fine line printed by UV PIJ is 98%, 40% higher than that of screen printing, and the color difference change ΔE≤1.2 after 500 hours of high temperature and humidity (85℃/85%RH) aging test, meeting up to the strict demands of IEC 60068-2-78.
Intelligent closed-loop color management system for dynamic calibration optimization. The spectrophotometer online integrated by a UV PIJ equipment brand real-time measures the color difference at the speed of 200 sampling points per second, and completes five channels of CMYKW ink volume adjustment within 0.5 seconds through a machine learning algorithm, reducing the batch to batch color difference fluctuations from ΔE±1.5 to ±0.3. After the system was installed in a cosmetics packaging product line, the pass rate of color difference during continuous production of 100,000 products increased from 88% to 99.97%, and the customer complaint rate dropped to 0.002%. As pointed out in the 2024 Digital Printing Color White Paper, UV PIJ 7 colors (CMYK+ white + gloss + special color) configuration can increase the metal color gamut coverage to 93% of the Pantone metal color system, while the traditional 6 color system only covers 78%.
Environmental adaptability enhancement technology ensures the color stability of the whole scene. The temperature control ink circuit system of the uv pij printer can keep the ink temperature change within ±0.3℃, and along with the 40-60%RH humidity stabilization module, the print Lab value change range is enhanced from the traditional equipment ΔL=±2.5, Δa=±1.8, Δb=±2.0 to ΔL=±0.4, Δa=±0.3, Δb=±0.5. Under the workshop temperature of ±8℃, an auto interior supplier’s printing of imitation wood decoration board using UV PIJ equipment still maintains the color consistency of ΔE≤1.0, replacing the traditional process after the yield increased from 82% to 99.5%, and the annual quality cost savings of more than 6 million yuan. All these technological innovations make UV PIJ printers an industrial-grade solution for high-precision color reproduction.