UV PIJ printers (piezoelectric on-demand inkjet) are unique in their own technology architecture. Taking an industrial UV PIJ device as an example, its piezoelectric nozzle array density of 1200 holes per inch, the volume of a single injection of ink droplets can be controlled with high accuracy between 1.5-35 liters, compared to the volume fluctuation of ±15% of hot foaming technology, the consistency deviation of ink droplets can be compressed to ±3%. During printing 800dpi two-dimensional code, the reading rate increased from 82% to 99.9% of traditional inkjet. Konica Minolta’s newly launched 2023 UV PIJ printer integrates three droplet volumes (6/12/24 picoll) in a single print using variable drop technology (VSD), reducing the grainy index (GSI) of the area of the image gradient to 0.8, much less than the industry standard of 2.5. With the implementation of this technology by a luxury packaging company, the replacement rate of hot stamping process was increased to 70%, and the annual production cost of 3.8 million yuan was reduced.
Synergistic advantages of curing efficiency and material flexibility create new application opportunities. The UV PIJ printer can complete the curing of the UV-LED with a wavelength of 395-405 nm in 0.01 seconds so that the ink adhesion on the non-absorbent substrate such as PET film and metal coating is at the 5B level of the ASTM D3359 standard, while water-based inkjet requires additional pretreatment layer by coating and adhesion only to 3B. A factory of car parts uses UV PIJ machine to print temperature resistance labels on the surface of aluminum alloy directly, and gets more than 90% color saturation after baking at 240 ° C for 2 hours, which is 60% higher than the temperature resistance level of common screen printing. As shown from the data of the “Industrial Printing White Paper” in 2024, the deviation of the ink drop point of UV PIJ when printing on curved surfaces is ≤±10 microns, and it is also used successfully for labeling medical catheters with a diameter of 3 mm and overcoming the minimal 5 mm curvature limitation of traditional flat printing.
From a full life cycle cost analysis, UV PIJ technology has sound economics. The comparative statistics of a printing company show that the life of the UV PIJ printer nozzle is as long as 8,000 hours, 5.3 times the hot foam nozzle (1,500 hours), and allows the replacement of a single nozzle rather than the entire module, reducing the annual maintenance cost from 120,000 yuan/unit to 25,000 yuan/unit. On an energy-consumption level, the UV PIJ system is only drawing standby power with just 50W while cutting down on the amount of power laser printers consume by a tremendous 83%, from 300W to the existing power consumption. Using an estimate calculation over 24 consecutive hours, per annual device running at electricity costs will be saved with more than 40,000 yuan. After the launch of UV PIJ solution by a multinational logistics company, the variable data printing speed was increased to 100 m/min, and zero inventory production mode came into reality in express sheet printing, and the warehouse turnover rate from 1.2 times/month to 6.5 times, and working capital occupancy fell by 78%.
Environmental compliance and intelligence are the twin push that drives technology replacement. The EU REACH regulation requires the level of isophorone content in printed material to be reduced from 1% to 0.1% by 2025, and the VOC emission of the photocurable ink used by UV PIJ printers is only 2g/kg, which is 99.3% lower than the 300g/kg of solvent-based inkjet. A packaging company group attained carbon tariff reduction through ISO 14064 certification by employing UV PIJ production lines, which saved 12 million yuan per year in compliance. From the intelligence perspective, the AI nozzle compensation system with a model of UV PIJ devices can sense and compensate clogged nozzles by 0.5% in real-time, reducing the rate of print interruption from 8 times per thousand hours to 0.2 times. The global UV PIJ market will be valued at $980 million in 2023, and penetration into pharmaceutical traceability code printing has grown from 12% in 2018 to 41%, confirming its triple value in accuracy, productivity and sustainability.