The same artwork can look sharp on one tray liner and muddy on another, and the difference is rarely the printer's skill: it is the combination of paper, ink and process. A burger photograph that prints cleanly on coated paper will lose detail on thin greaseproof; a bold two-colour pattern that is cheap and crisp on greaseproof by flexo may be the wrong choice for a coated offset run. So choose the paper first and the process to suit it. Below: what offset, flexo and digital each do well on liner papers, what full colour realistically looks like on each, and how ink and food contact fit together. Papers, sizes and formats are covered at custom printed tray liners and placemats.
Which print process is best for tray liners?
Offset suits full-colour artwork on coated and offset paper, flexo suits spot colours and patterns on greaseproof and kraft, and digital suits short runs and many versions. The best process depends first on the paper, then on the artwork and then on the quantity.
| Factor | Offset litho | Flexo | Digital |
|---|---|---|---|
| Typical papers | Coated glossy and matt, uncoated offset, sometimes kraft | Greaseproof, kraft, reel-fed papers | Coated and offset papers |
| Best artwork | Photographs, gradients, detailed illustration | Patterns, solid colours, line art, logos | Variable artwork, many versions |
| Colour approach | CMYK plus optional spot colours | Spot colours, 1 to 4 colours typical, process builds possible | CMYK, limited spot match |
| Setup | Plates and press makeready per job | Plates and anilox rolls per job | No plates; quick set-up |
| Run-length fit | Medium to long runs | Medium to long runs, strong on reels | Short runs and tests |
| Weak points | Slower ink setting on dense stock; makeready waste | Limited fine detail; thin stock needs registration care | Higher cost per sheet at volume; spot colour limits |
For the processes in general, beyond liner papers, see flexo vs offset vs gravure vs digital printing.
What can offset printing do on tray liners?
Offset lithography transfers ink from a plate through a rubber blanket onto the sheet. It reproduces fine halftone dots, so photographs, gradients and small type print cleanly, particularly on coated paper where ink stays on the surface. It is the usual route for placemats and liners with detailed full-colour artwork, and it is cost-effective at medium to long runs.
Points that affect results:
- Coated paper gives the sharpest and most saturated colour because ink sits on the coating
- Uncoated offset paper absorbs more ink, so colours look softer and dots spread more (dot gain), which printers compensate for in prepress
- Dense or non-absorbent sheets such as greaseproof dry more slowly, so offset on greaseproof is less common and needs suitable inks and drying
- Overprint varnish, where used on glossy coated paper, improves rub resistance and gloss
- Spot colours can be added as a fifth or sixth unit for brand colours, and this is useful for Pantone-defined logo colours
For brand colour tolerance across several printers and sites, see Pantone vs CMYK in packaging.
What can flexo printing do on tray liners?
Flexography prints from flexible relief plates using fast-drying inks, and is efficient on reels and on papers that are thin or dense. It excels at solid colours, bold patterns, line art and logos, and is the standard process for printed greaseproof wraps and liners. Fine photographic detail is more limited than offset.
What buyers should expect:
- One to four spot colours is the typical sweet spot; more colours add cost and registration risk
- Solid areas and strong patterns print well; very fine lines and delicate gradients are harder
- A repeating all-over pattern is forgiving of small cutting shifts; a registered logo needs print-to-cut control
- Thin 40 gsm greaseproof can stretch or shift with humidity, so tight multi-colour registration needs care
- Process-colour images are possible, but results are coarser than offset
Printing on greaseproof, including ink coverage and set-off, is covered in detail in printing on greaseproof paper; that page owns the wrap-focused detail, and this one covers the liner-specific points.
How does ink coverage affect a tray liner?
Heavy ink coverage makes a sheet stiffer, slower to dry and more likely to mark the sheet below in a stack. Light coverage keeps thin paper flexible and cheaper to print. As a rule, the thinner and denser the paper, the more important it is to limit the amount of ink and the size of solid areas.
- On 40 gsm greaseproof, large solid floods risk set-off and sheet distortion; patterns with open areas are safer
- On kraft, high coverage with dark ink reproduces well, but light inks lose strength
- On coated paper, high coverage prints well, but heavy ink and varnish increase drying time and cost
- Print on both sides adds complexity and food-contact questions; most liners are printed on one side
Ask the printer for a printed proof on the actual paper, not a screen or a sample on a different stock. Check rub and set-off by stacking and handling a few printed sheets.
What does full colour mean on each paper?
Full colour means CMYK process printing, where cyan, magenta, yellow and black dots combine to make any colour. The results differ by paper: excellent on coated, good on offset paper, acceptable on kraft only with strong images and poor on thin greaseproof for detailed photographs.
| Paper | Full-colour result | Practical advice |
|---|---|---|
| Coated glossy | Excellent: saturated, sharp, strong photographs | Best for promotions and children's designs |
| Coated matt | Very good: sharp but with a quieter finish | Best for readable menus with photographs |
| Offset (uncoated) | Good: soft colours, a natural feel | Fine for illustrations, menus, brand patterns |
| Kraft | Limited: brown base mutes colours | Favour bold, dark, few-colour designs |
| Greaseproof | Limited for photography; good for patterns and spot colours | Use illustrations and solid colours, keep photography small |
If photography is central to the design and the tray will carry fried food, consider a combined approach: a coated liner on the tray for visual impact and a plain or lightly printed greaseproof sheet or basket liner where the fried food sits. The paper side of this decision is in tray liner paper.
Which inks are suitable for food-contact liners?
Use inks and coatings that are suitable for printed material in contact with food, and ask for documentation that covers them. In the EU, Regulation (EC) 1935/2004 and Regulation (EC) 2023/2006 apply to food-contact materials, and the latter includes rules on printing inks and the prevention of set-off. Germany adds a positive-list printing ink ordinance (Druckfarbenverordnung) that applies from 1 January 2027, and Swiss rules and EuPIA guidance are used as references in the market.
Three practical points:
- Because food often touches the printed face of a liner, the ink needs to suit the way the liner is used; printing on the underside only is rarely what a brand wants
- Fully cured or fully dried inks, and low-migration systems where required, reduce the risk of transfer
- Request ink and coating declarations and confirm the compliance route at quotation and technical review
US buyers apply FDA food-contact rules, and PFAS restrictions can apply to grease-resistant paper itself; see food-contact packaging compliance in the EU, UK and US and PFAS-free food packaging. The packaging-status question is covered in are tray liners packaging?.
How should you choose print method by run length?
For short runs and many versions, digital printing avoids plate costs; for medium to long runs of one design, offset or flexo becomes more economical. The break-even depends on paper, size, number of colours and the supplier's equipment, so it is confirmed at quotation.
A practical rule of thumb:
- Many designs, small quantity each, frequent changes: digital on coated or offset paper
- A few designs, repeated reorders, full colour: offset
- One or two brand patterns, high volume, greaseproof or kraft: flexo
- Seasonal promotions on a brand pattern: print the base pattern in a long run and the promotion in a shorter run where the supplier's set-up allows it
Run lengths and costs are shaped by plates, makeready and paper, as described in what determines MOQ and cost drivers. Deadlines and proofs follow lead times.
Print specification checklist for a tray liner quotation
Send this information to get a quotation based on the right process:
- Artwork or concept: photographs, illustrations, patterns or logo only
- Number of colours and any Pantone references
- Paper choice or food type on the tray
- Size, corner style or custom shape
- Single-sided or double-sided printing
- Varnish or finish preferences
- Documentation required for inks and coatings
- Quantity per design and number of versions
Artwork preparation is covered in packaging artwork preparation. Return to the tray liner hub for the full range, or send your artwork and specification.