A high-performance continuous inkjet printer can print up to six lines of text or dense variable data, including high-contrast DataMatrix codes and barcodes, at high production-line speeds [S4].
Binary-array CIJ systems are non-contact coding machines for packaging and products moving through fast lines, with examples reaching 1,777 characters per second on three lines and five lines at up to 10 m/s [S1].
Binary Array CIJ Scope and Operating Principle
Continuous inkjet printing uses a continuous stream of tiny ink droplets: selected droplets are electrically charged and deflected by an electrostatic field onto the product, while uncharged droplets return to the printer [S1]. Binary-array CIJ uses this drop-on-demand principle for variable characters, logos, barcodes, and DataMatrix codes, without a printhead touching the substrate.
Unlike thermal inkjet, which ejects drops from a cartridge close to the surface, a CIJ printhead can project droplets across a standoff distance measured in centimeters, making it suitable for fast-moving, curved, or otherwise difficult products [S1]. A continuous binary inkjet jet produces a single line of pixels, so multi-line coverage requires a suitable nozzle arrangement or printer architecture [S9].
That distinction matters for terminology. A CIJ machine is the broader category; a binary-array model refers to its controlled droplet-generation architecture. Published specifications for specific CIJ models should therefore be checked for the required number of lines, character height, coding rate, and supported data content rather than inferred from the generic technology name [S1][S2].
Line Count, Coding Rate, and Speed
Five lines at up to 10 m/s, together with a stated rate of 1,777 characters per second on three lines, defines a credible high-speed envelope for one industrial CIJ system [S1]. Another published CIJ configuration prints up to eight text lines and permits large and small fonts to be combined in one print run [S2].
Published comparisons also list a CIJ line-speed figure of 508 m/min, while a high-performance system is described as capable of handling products moving above 100 m/min [S3][S7]. These figures are not interchangeable ratings. Character pitch, font height, nozzle configuration, ink viscosity, and code density can reduce the usable coding rate, so a supplier should demonstrate the required character set at the actual line speed and standoff distance [S8].
The practical selection test is the required code, not the headline speed. A simple date or lot number has a lower data burden than a multi-line message containing a logo, barcode, and DataMatrix symbol. For variable content, validate the complete payload at the minimum production speed and with the inks and substrate intended for use [S3][S4].
Comparison of Multi-Line Coding Architectures
Single-nozzle, twin-nozzle, bi-jet, and traversing CIJ arrangements differ in code layout, throughput, capital complexity, and access to high-density data. A twin-nozzle model supports up to eight text lines, while a traversing arrangement moves one printhead across multiple lanes and can target an X-Y matrix of packages [S2][S4].
Single-head or dual-head layouts are straightforward when each product passes beneath a fixed coding position. A multi-printer installation duplicates printheads, ink circuits, controls, and service points across the line. A traversing system instead uses one CIJ printhead on a servo-controlled X-Y rail, with the head moving across the web or along the film during the packaging dwell phase [S4].
For eight lanes, the documented comparison calculates capital expenditure for eight separate printers against one CIJ system and one traversing rail assembly, while also contrasting the associated fluid consumption and startup or shutdown evaporation [S4]. The numbers are configuration-specific, but the engineering distinction is general: traverse complexity is substituted for duplicated station complexity, not eliminated.
The 9712 bi-jet architecture offers another route for especially large codes and higher data volume, with Markem-Imaje framing it around doubling coding speed or the amount of data printed [S5]. This is not the same requirement as adding more text lines. Buyers must separate line-count expansion, data-density expansion, and code-size expansion when comparing models.
Substrates, Ink Systems, and Standoff
CIJ can mark plastics, glass, metal, coated surfaces, and other packaging materials without direct contact [S1][S6]. Porous cardboard absorbs ink differently from glass, metal, or plastic film, while curved and uneven surfaces require a validated drop-placement pattern and suitable printhead distance [S3].
Ink choice must satisfy the substrate, coding speed, environmental conditions, and required contrast. Hitachi offers MEK-free methyl ethyl ketone variants and ethanol-based inks, as well as pigmented white and yellow inks for dark surfaces; its UX2 system also uses an automatic printhead cleaning and drying station to reduce drying during extended downtime [S2].
Solvent-based fast-drying inks can congeal in a printhead after a production pause, creating a cleaning and restart burden [S1]. Automatic sealing, flushing, cleaning, or drying features should therefore be compared against the plant’s actual stoppage pattern. Cleaning intervals are model-specific, and Hitachi cites main-filter replacement examples of 4,000 or 6,000 operating hours depending on the model [S2].
Integration, Controls, and Maintenance
CIJ printers are normally controlled through their own printhead and controller, but integration determines whether variable codes follow the product correctly. Hitachi UX and UX2 systems support OPC UA or Modbus communication for automated print-data transfer from plant control systems [S2].
A production selection should define triggers, encoder inputs, code recipes, reject logic, and the location of the print zone before comparing models. Moving equipment also requires a synchronized dwell cycle: an X-Y head must complete the programmed path while the web or pack indexer is stationary, or it must maintain a calculated offset during film-following motion [S4].
Maintenance planning must include ink condition, filters, printhead cleanliness, solvent handling, and startup readiness. LEIBINGER identifies nozzle clogging after idle periods as a direct production risk and links automatic printhead resealing with preventing dried ink from affecting restart performance [S1]. A machine’s rated coding speed is of limited value if it cannot restart cleanly after a weekend or holiday shutdown.
Where Binary Array CIJ Fits
Binary-array CIJ is appropriate for food and beverage packaging, pharmaceutical vials, cosmetics, cables, automotive parts, and other high-speed products requiring batch numbers, dates, logos, barcodes, or DataMatrix codes [S2][S3][S6]. It is especially useful when codes must remain legible on curved, coated, porous, or moving surfaces without physical contact [S1][S3].
It is less suitable where a very small code volume can be handled by a simpler, less expensive coding method, or where the line lacks a validated substrate-and-ink combination. A fixed-position single-line code may not justify a multi-line or traversing installation, while a high-density matrix requirement can exceed what a standard single-line configuration can deliver [S3][S4].
The correct specification should therefore name the required line count, maximum characters per second, product speed, character height, code standard or symbology, maximum data payload, substrate, ink chemistry, standoff distance, controls protocol, and expected start-stop frequency. Those parameters turn the comparison into an engineering test rather than a contest between maximum headline figures.
For procurement verification, request a live print of the exact production payload on representative packages at the contractual line speed. Track the demonstrated code rate, the number of lines, restart behavior after an idle period, and the interface signals for production control [S2][S8].