"My line runs at 120 meters per minute and I pack in PET laminate film — which coding machine should I buy?"
This is one of the most common questions we hear from food manufacturers. Too many buyers approach the decision backwards: they ask about price first, compare brands second, and only after installation discover the machine can't keep up with the line — or the code rubs off during shipping. The result is an expensive paperweight and workers hand-labeling batch codes at the end of the shift.
Four technologies dominate food batch coding: CIJ (continuous inkjet), TIJ (thermal inkjet), TTO (thermal transfer overprinting), and laser marking. None of them is universally "best." Each is best for a specific combination of line speed and packaging material. This article breaks down the decision from three angles: speed, substrate, and total cost of ownership.
Point One: Start With Speed — Your Line Already Eliminated Half the Options
Conclusion: Line speed is the first filter. Ultra-high-speed lines point to CIJ and laser; mid-speed lines get the best value from TIJ; intermittent-motion packaging machines are practically married to TTO.
Choosing a coding technology is like choosing an engine for a vehicle. You wouldn't ask a 1.5L naturally aspirated engine to haul a fully loaded truck — not because it's a bad engine, but because it's the wrong application.
- CIJ (continuous inkjet): a high-pressure pump creates a continuous stream of ink droplets in a non-contact process. Top speeds are very high — some models exceed 300 m/min (over 1,000 ft/min) — making CIJ the standard on beverage bottling lines.
- TIJ (thermal inkjet): works like an office inkjet printer, ejecting droplets through heat. Its sweet spot is below 120 m/min, where it performs excellently at a fraction of the cost.
- TTO (thermal transfer overprinting): a heated printhead transfers ink from a ribbon onto flexible film. Intermittent models need the film to pause briefly; continuous models run alongside high-speed flow wrappers.
- Laser: a light beam marks the code directly into the surface — no ink, no drying time. Speed depends on wattage and content complexity, and a properly sized CO₂ laser handles mass production with ease.
Real-world scenario: a 500-bottle-per-minute beverage line realistically has only two candidates — CIJ and laser. A 60-bag-per-minute snack line is perfectly served by TIJ, at a much lower price.
Point Two: Then Check Material — the Wrong Technology Means the Code Won't Stay
Conclusion: Substrate determines adhesion and code lifetime. Flexible films belong to TTO; curved surfaces and harsh environments belong to CIJ; cartons and flat porous surfaces belong to TIJ; permanent marking belongs to laser.
This is where food plants make the most expensive mistakes. Think of coding as writing on different walls: on a concrete wall (cardboard), even chalk stays; on glass (a PET bottle), an ordinary pen wipes off with a finger.
- Flexible films (PET, PE, laminates, foil): TTO territory. Ribbon-transferred codes are sharp, abrasion-resistant, and high-resolution, and swapping a ribbon is cleaner than handling liquid ink.
- Plastic bottles, curved surfaces, wet or condensing environments: CIJ's solvent-based inks dry fast, adhere aggressively, and print without contact on almost any product shape.
- Cartons, paper labels, porous materials: TIJ's water-based inks penetrate well and reach resolutions up to 600 dpi with excellent barcode scan rates, while CIJ typically delivers only 70–80 dpi.
- Glass, metal cans, anti-counterfeit permanence: laser creates a physical, ink-free, tamper-proof mark — and keeps recyclable packaging free of ink contamination.
Laser itself splits further: CO₂ suits organic materials like cardboard, glass, and PET; fiber suits metal cans and hard materials; UV "cold" lasers handle heat-sensitive films and premium cosmetics, though at higher cost and lower efficiency.
Real-world scenario: a sauce plant printed with TIJ onto coated paper cups. The ink took days to dry and smeared on contact. Coated surfaces are non-porous — switching to CIJ with fast-dry solvent ink solved the problem overnight.
Point Three: Finally, Run the Numbers — Purchase Price Is Only the Tip of the Iceberg
Conclusion: Over a five-year horizon, typical TCO ranking is: TIJ lowest, TTO mid-range, CIJ high, and laser expensive upfront but nearly consumable-free afterward.
Buying on sticker price alone is like buying a car based on the showroom price without asking about fuel consumption. Stretch the math over five years:
- TIJ: swap-and-go cartridges, almost zero maintenance, the lowest cost of ownership — but ink spending scales linearly with volume.
- TTO: controllable ribbon costs, a printhead with finite life but easy replacement; strong for high film-packaging volumes.
- CIJ: continuous ink and solvent consumption, periodic ink-system maintenance, and several minutes of startup before production.
- Laser: the highest upfront investment, but no ink or ribbons at all, few moving parts, minimal downtime — the cheapest option long-term on high-volume lines.
Industry analysis suggests that around 80% of low- to mid-speed lines achieve better cost efficiency with TIJ, while CIJ remains irreplaceable in ultra-high-speed and solvent-demanding environments.
Real-world scenario: a snack line producing 100,000 bags a day spent roughly $5,500 per year on CIJ ink and solvent. After switching to a CO₂ laser, it recovered the investment difference in three years — and eliminated every stoppage caused by clogged printheads.
A Real-World Case: The Bakery That Bought the Wrong Three Machines
A bakery in eastern China ran two flow-wrap lines (laminate film, 80 m/min) plus one cartoning line. To keep things simple, the owner bought three TIJ printers. On the film, the codes wore off during transport, and distributors complained that traceability codes wouldn't scan.
The fix: the two flow-wrap lines moved to TTO — ribbon-transferred codes on laminate proved abrasion-resistant with a 100% scan rate; the carton line kept TIJ for large characters at minimal cost. Complaints dropped to zero within three months. The following year, when commissioning a new 180 m/min line, the owner went straight to a CO₂ laser: "This time I learned my lesson — speed and material first, price second."
The key takeaway: a single factory usually needs a combination of technologies. There is no "one machine for everything." Matching the right technology to each line is the correct answer.
Summary
The selection logic has three steps: speed eliminates what won't work, material confirms what will, and total cost picks what's worth it. CIJ wins on speed and versatility, TIJ on affordability and simplicity, TTO on flexible-film quality, and laser on permanent, consumable-free marking. When FIRSTCOLOR designs a coding solution for a client, the first request is always the same: send us a video of your line and a sample of your packaging material — because choosing a coding technology without knowing your speed and substrate is just armchair theory.