What is TTO (Thermal Transfer Overprinting)?
How thermal transfer ribbon printing delivers premium quality on flexible film.
Thermal Transfer Overprinting (TTO) is the standard way to put high-resolution codes on flexible packaging — sachets, pouches, flow-wrapped and form-fill-seal products.
How TTO works
A thermal printhead presses a ribbon against the film as it passes. Tiny heating elements in the printhead melt ink from the ribbon onto the film wherever a dot is needed. Because the image is built from closely spaced heated dots, TTO produces dense, sharp text, logos and barcodes that scan reliably.
TTO units are usually mounted inside the packaging machine and run in either intermittent mode (film stops while printing) or continuous mode (film moves past the printhead).
Where TTO fits best
- Flexible films and labels.
- Codes that must scan: barcodes, QR codes, GS1 data.
- Packaging machines where the film path gives the printer a flat, controlled surface.
What TTO costs to run
TTO has two costs that buyers should always separate:
- Ribbon. Ribbon used per message = (message height in mm + gap between prints in mm) ÷ number of lanes printed across the ribbon width. Monthly rolls = ribbon used ÷ roll length. Cost depends on message geometry, not the number of characters.
- Printhead wear. Printheads are rated for a number of kilometres of ribbon travel. Printhead cost per month = kilometres of ribbon used ÷ rated life × printhead price.
On the calculator's default TTO example (5,20,000 prints a month, 20 mm message with a 5 mm gap, 600 m rolls at ₹1,200, ₹35,000 printhead rated for 60 km):
- Ribbon used: 25 mm × 5,20,000 = 13,000 metres a month — about 21.7 rolls, or ₹26,000.
- Printhead wear: 13 km ÷ 60 km × ₹35,000 = ₹7,583 a month.
Printhead wear is nearly a quarter of the consumable cost, but it never appears on a monthly invoice — which is why it is so often left out.
Ways to reduce TTO running cost
- Keep the gap between prints as small as the machine allows.
- Print multiple lanes across one ribbon width where the layout permits.
- Match ribbon chemistry (wax, wax-resin or resin) to the film to avoid smudging and rework.
- Use the lowest print darkness that still passes barcode verification, to extend printhead life.
Use the TTO running cost calculator to work out ribbon, printhead and total cost per print for your own packs, or compare TTO against TIJ, CIJ and laser in the TCO Wizard.