TTO vs CIJ for Flexible Packaging Coding: How to Choose the Right Printer for Pouches, Films and Sachets

Flexible packaging moves fast. On a vertical form-fill-seal (VFFS) machine or a flow wrapper, a pouch can be formed, filled and sealed in well under a second, and the code printed on it has to be legible, compliant and repeatable on every single pack. Two technologies dominate this space: thermal transfer overprinting (TTO) and continuous inkjet (CIJ). Both print variable data onto film, but they work in completely different ways, consume different materials and suit different jobs. This article compares TTO and CIJ for flexible packaging coding across food, pharmaceutical, cosmetics and daily-chemical production lines, and gives practical guidance on choosing between them.

How TTO Works on Flexible Film

TTO uses a thermal printhead and a ribbon. The printhead is pressed against the ribbon, and tiny heating elements transfer ink from the ribbon onto the substrate. Because the image is built from many small dots, TTO delivers 300 dpi-class resolution — sharp enough for small ingredient text, nutritional panels, GS1 barcodes, QR codes and even simple logos, printed directly onto film without a label.

TTO runs on both intermittent-motion and continuous-motion machines. On an intermittent VFFS machine, the printer waits for the film to stop and then prints. On a continuous-motion flow wrapper, the printhead travels with the film while printing, so the code stays crisp at line speed. The process is dry: no solvent to handle, no ink mist, and no wet print that can smear before it dries.

Compatible TTO systems we supply include Videojet Dataflex 6330, 6530 and 6230 units, plus Linx TT500, TT750 and TT1000 models, available with 32 mm and 53 mm printheads. These are established platforms in flexible packaging, and we supply them as compatible systems rather than as the original manufacturer.

How CIJ Works on Flexible Packaging

Continuous inkjet works differently. A pump pushes ink through a nozzle, breaking it into a continuous stream of tiny droplets. Each droplet is charged and then deflected by an electrostatic field so that it lands in the right place on the product. The printhead never touches the surface — that is the key advantage.

Because CIJ is non-contact, it can print on already-formed pouches, on the shoulder or cap of a bottle, on curved surfaces, on uneven film, and on packs that are already filled and sealed. CIJ is fast, and it is the workhorse for date codes, batch numbers, lot codes, expiry dates, shift codes and other simple one-to-three-line variable data. WDOTMARK supplies the F640, F650, F660 and F680 small-character CIJ printers, each with a 10-inch color screen and a choice of 60 µm or 70 µm nozzles, plus the ECJET1100.

CIJ inks are solvent-based. That means ventilation, correct handling of ink and make-up fluid, and daily attention to the nozzle and gutter.

TTO Strengths in Flexible Packaging

High-resolution print quality. At 300 dpi-class resolution, TTO produces small text that stays readable, dense barcodes that scan reliably, and QR codes that hold up on curved film — provided the ribbon grade matches the film and tension is properly controlled. On wrinkled film, request a sample test before committing to the specification. If the code is part of the pack design rather than just a legal afterthought, TTO is usually the better fit.

Direct printing on film. TTO prints straight onto the laminate — no label stock, no pre-printed panel and no secondary applicator. That keeps the packaging structure simple and reduces material cost.

Clean, dry process. With a ribbon there is no solvent, no ink mist and no wet ink to smudge. The print area stays clean, which matters on food and pharmaceutical lines where hygiene and appearance are closely inspected.

Works with intermittent and continuous motion. TTO integrates naturally with VFFS machines, flow wrappers, sachet machines and labelers. The same printhead handles stop-start cycles and continuous film travel.

Consistent contrast. With the right ribbon grade — wax, wax-resin or resin — TTO produces strong, repeatable contrast on most common films, including coated and metallized structures.

The trade-off is that TTO needs a reasonably flat, tension-controlled print area, and ribbon consumption scales with the size of the printed area.

CIJ Strengths in Flexible Packaging

Non-contact printing. The printhead can sit several millimeters from the surface, so CIJ handles formed pouches, gussets, caps, closures, tubes and curved bottle shoulders without any contact or pressure.

High line speed. CIJ keeps up with fast filling and capping lines, printing short codes on pack after pack without slowing production.

Broad substrate tolerance. With the correct ink, CIJ marks films, laminates, foils, cartons, plastics and metals — useful on lines running mixed packaging formats.

Real-time and multi-line data. CIJ printers handle clocks, expiry calculations, shift codes and multi-line layouts, which makes them a natural choice for regulatory date and batch coding.

Low cost per short code. For a two-line date and batch code, ink and solvent consumption is modest, and the per-pack consumable cost is often lower than a ribbon-based solution.

The trade-offs are solvent handling, ventilation requirements, and a maintenance routine that includes nozzle cleaning and filter changes.

TTO vs CIJ: Side-by-Side Comparison

Choosing by Application

The decision usually comes down to what is being printed, and where on the pack.

Choose TTO when the code is high-resolution content printed on film. If your line prints nutritional information, ingredient lists, allergen statements, 2D codes, barcodes or promotional text directly onto the film web, TTO gives you the resolution and consistency those jobs need. It is also the cleaner option where solvent handling is difficult or where the print area must stay dry.

Choose CIJ when the code is variable data applied after the pack is formed. Date codes, batch numbers, lot codes and expiry dates on formed pouches, bottles, caps, tubes and closures are classic CIJ work. The non-contact printhead reaches places a ribbon printer cannot, and the per-code cost stays low.

Run both when the line does both jobs. Many food and daily-chemical plants use TTO for the designed print area on the film and CIJ for the date code on the finished pack. The two technologies complement each other rather than compete, and specifying both from one supplier simplifies spare parts, training and service.

For pharmaceutical and cosmetics packaging, where traceability and permanence carry extra weight, it is also worth reviewing laser options before finalizing the specification.

Product Mapping

If TTO fits your line, WDOTMARK supplies compatible TTO systems — Videojet Dataflex 6330, 6530 and 6230, and Linx TT500, TT750 and TT1000 — with 32 mm and 53 mm printheads. We describe these as compatible TTO systems we supply; they are not manufactured by WDOTMARK.

If CIJ fits your line, the range covers the F640, F650, F660 and F680 small-character CIJ printers, all with a 10-inch color screen and 60 µm or 70 µm nozzles, plus the ECJET1100. Compatible consumables — including inks, solvents and RFID chips for Domino, Videojet, Markem-Imaje, Linx, Willett and KGK equipment — are also available.

For permanent marking on bottle bodies, glass and many plastics, a UV laser is a strong alternative. WDOTMARK offers the flying UV YT-U5, the portable U10 and the CCD UV T-U5, all operating at 355 nm and suited to plastics, glass and bottle bodies where a no-consumable, permanent mark is required. You can review the full UV range here: /uv-laser-marking-machine/.

For CIJ hardware and consumables, see /cij-inkjet-printer/, and for TTO options, /tto-thermal-transfer-overprinter/.

Quick Decision Checklist

• Is the code high-resolution content — barcodes, QR codes, nutritional panels, logos? If yes, lean TTO.
• Is the code a date, batch or lot code applied to a formed pack, cap or bottle? If yes, lean CIJ.
• Is the print surface flat, with controlled film tension? TTO works well here.
• Is the print surface curved, uneven or already sealed? CIJ is the safer choice.
• Does the line run continuously at high speed with short codes? CIJ usually wins on cost per pack.
• Does the print area need to look like part of the pack design? TTO gives the better finish.
• Can the site handle solvent storage and ventilation? If not, TTO or UV laser may be preferable.
• Does the mark need to be permanent and consumable-free? Consider UV laser marking.

FAQ

Can TTO print barcodes and QR codes on flexible film?

Yes. TTO's 300 dpi-class resolution is well suited to barcodes, 2D codes and QR codes printed directly on film, provided the ribbon grade matches the film and the print area is flat and under proper tension.

Can CIJ print on already-formed pouches?

Yes. Because CIJ is non-contact, it prints on formed and filled pouches, gussets, caps and closures without touching or deforming the pack. This is why it remains the standard for date and batch coding on finished packs.

Which technology is cheaper to run?

It depends on the code. For short date and batch codes at high volume, CIJ consumable cost per pack is typically low. For larger, high-resolution print areas, ribbon consumption pushes TTO cost up. Calculate cost per code at your actual print size, not per litre or per roll.

Do you supply TTO printers?

We supply compatible TTO systems — Videojet Dataflex 6330, 6530 and 6230, and Linx TT500, TT750 and TT1000 with 32 mm and 53 mm printheads — alongside WDOTMARK CIJ models and UV laser systems. We do not claim to manufacture the compatible TTO units.

Can the printer be integrated with an existing VFFS or flow wrapper?

Yes. We handle project-based integration including conveyors, feeders, feeding lines, and vision inspection and rejection systems, so the printer works as part of the line rather than as a standalone unit.

What are the ordering terms?

MOQ starts from 1 unit, confirmed on inquiry, with a lead time of 15 days or less. Certificates available upon request. WDOTMARK is a MIC Diamond Member and an SGS audited supplier, and our equipment ships to the Middle East.

Request a Free Marking Test

The fastest way to settle the TTO versus CIJ question is to test your own film, pouch or bottle. Send us a sample and your code requirements, and we will run a free sample marking test so you can compare resolution, contrast, adhesion and speed on the real substrate before you commit.

Contact WDOTMARK on WhatsApp at +86 193 0303 6632 or by email at sales@fiberlasermarker.com. You can also ask for Mr. Pan if you would like to discuss a full line specification, including compatible TTO systems, CIJ printers, UV laser marking and integration with VFFS, flow-wrap and conveyor equipment.