In thermal transfer printing, the printhead heats dots on an inked film (the ribbon) and the ink transfers to the label. The ribbon decides print quality and durability as much as the material does: a wax ribbon on polyester wipes off with a finger and a resin ribbon on paper is wasted. This guide explains the three types, how to choose them and how to order the right size.
The three types
Wax
The ink is mostly wax. It melts at low temperature, so it is gentle on the printhead and prints fast. It gives dense black on paper, but the print scratches with a fingernail and does not resist solvents or heat. It is the ribbon for short- and medium-life paper labels: shipping, fast-turnover inventory, box contents.
Wax-resin
A blend of wax and resin. More resistant to rubbing and moisture than wax, it prints well on matte coated paper and on light synthetics such as BOPP and polyethylene. It is the general-purpose ribbon when the label is handled, rubbed or exposed to moderate moisture: warehouse boxes, product labels with lot, codes that live for months.
Resin
Pure resin ink that needs more heat and bonds chemically to smooth synthetics. The print resists solvents, heat, abrasion and outdoor exposure for years. It is the only ribbon for polyester and vinyl: data plates, fixed assets, laboratory and chemical labels. On paper it bonds poorly and is not worth it.
Which ribbon for each material
| Label material | Ribbon | Print durability |
|---|---|---|
| Thermal transfer paper, standard coated paper | Wax | Months, dry indoors |
| Matte coated paper with handling, BOPP, polyethylene | Wax-resin | One or two years, moderate moisture |
| Polyester, vinyl, BOPP with chemicals or heat | Resin | Years, outdoor, solvents and up to 150 °C |
Rule of thumb: the ribbon must be at least as durable as the label. There is no point paying for polyester and saving on the ribbon.
How to order the size
Width
Equal to or slightly wider than the label (up to 5 mm wider), so the ink covers the whole printable surface and the printhead does not rub on the label without ribbon. Never narrower than the label. Standard widths run from 40 to 110 mm; the maximum is set by the printhead (104 mm on 4" printers, 168 mm on 6" printers).
Length
It depends on the model: desktop printers use 74 m ribbons; industrial printers, 300 or 450 m. A ribbon that is too long does not fit in the compartment. As a reference, 74 m print about two thousand labels 25 mm high on a single ribbon, because the ribbon advances with the label and is not reused.
Core
0.5" (12.7 mm) on desktop printers and 1" (25.4 mm) on industrial printers. The manual of your printer states it; it is also a good check that the chosen length is correct.
Ink side
The ink can be on the outside (CSO, coated side out) or the inside (CSI, coated side in) of the roll. A ribbon with the ink on the wrong side prints blank and smears the printhead. To check, stick a piece of adhesive tape on the ribbon and peel it off: if it takes ink, that is the inked side. Desktop printers usually use ink out; many industrial printers accept both or require ink in.
Care that extends printhead life
- Use the lowest print temperature that gives solid black; excess heat wears the printhead and makes resin bleed.
- Clean the printhead with isopropyl alcohol at every ribbon change.
- Store ribbons in their packaging, away from heat and light; wax degrades above 35 °C.
- Pair ribbon and label from the same supplier when you can: the compatibility tests are already done.
A simple test
Print a label, wait a minute and rub the code with a fingernail and with a cloth dampened in alcohol. If wax lifts with the nail, move up to wax-resin; if wax-resin smears with alcohol and the label will be in contact with chemicals, use resin. If the code scans after both tests, the ribbon is the right one.
The standard catalog sells wax, wax-resin and resin ribbons by size, with 0.5" or 1" core, together with the blank thermal transfer labels that go with them.
