Inkjet Coding Machine Suppliers & Manufacturers

Inkjet coding technologies and applications

Inkjet coding machines print variable information — expiry dates, best-before dates, batch codes, lot numbers, barcodes, QR codes, and production shift data — directly onto product packaging without contact at production-line speeds. The three main inkjet coding technologies are: Continuous inkjet (CIJ) — ink is continuously pumped from the reservoir through a nozzle, forming a stream of charged ink droplets; deflection electrodes direct selected droplets onto the substrate while unwanted droplets are recirculated; CIJ is the workhorse technology for coding at very high production speeds (up to 200,000+ per hour), printing on almost any surface material, and with very small print head footprint allowing installation in tight line spaces. The print area is small (typically 1–3 lines of characters); primary substrates are glass, PET, metal, carton, and flexible film. Thermal inkjet (TIJ) — ink is expelled through tiny nozzles by a pulse of heat; TIJ cartridges are self-contained, low-cost, and produce high-resolution print (300–600 dpi); suitable for cartons, labels, and porous substrates; lower throughput than CIJ; no solvent recycling required; popular for pharmaceutical secondary packaging (carton coding) and print-and-apply applications. Drop-on-demand (DOD) large character inkjet — electrically generated ink drops form large characters (typically 10–100mm height) for coding onto porous surfaces (corrugated boxes, outer cartons); used for pallet-level shipping marks and case coding; solvent-based or UV-curable inks for non-porous surfaces. All inkjet coding machines print variable data — date, time, batch, and line number — from internal or networked data sources. Many current models connect to ERP or MES systems for recipe download, production data logging, and remote monitoring.

Ink selection, IP rating, and sourcing guidance

Ink selection is critical for inkjet coding performance. Key ink properties are: substrate compatibility — inks are formulated for specific surface types: solvent-based MEK (methyl ethyl ketone) inks for glass, PET, metal; alcohol-based inks for packaging materials where MEK is not permitted; pigmented inks for opacity on dark surfaces; food-safe inks for surfaces that may contact food. IP rating: for wet, humid, or wash-down production environments (dairy, beverage, fresh food), the coding machine must carry an appropriate IP rating (IP55 or IP65 for splash resistance; IP69K for high-pressure wash-down). Ink consumption and cost: CIJ machines require solvent replenishment as solvent evaporates from the ink circuit; solvent recovery and make-up solvent cost is an ongoing operational expense. TIJ cartridges are replaced when exhausted — cartridge cost is higher per print than CIJ ink at high volumes but simpler to manage at lower volumes. Key players in CIJ: Videojet (Danaher), Markem-Imaje (Dover), Domino, Linx, Leibinger. Chinese CIJ manufacturers offer lower capital cost with growing quality at lower throughput applications. When sourcing, specify: production line speed, substrate material, print height requirement, number of print lines, whether barcode or QR code is required, environmental conditions (wash-down, temperature, humidity), IP rating, and whether connectivity (Ethernet, OPC-UA) to factory systems is needed.

Frequently asked questions