TL;DR. For food packaging, cold foil is rarely a "decoration" question — it is a food-safety, barrier and recyclability question wearing a metallic finish. Modern UV cold-foil adhesives now meet the Swiss Ordinance positive list and EuPIA exclusion-list requirements for indirect food contact, cure to < 50 ppb residual photoinitiator when properly dosed, and run on the same UV flexo and UV offset lines that print the rest of the carton. For a 100,000-unit chocolate sleeve, cold foil typically lands 30–45 % below hot-foil tooling cost while keeping the carton in a single mono-material PPB (paper-and-board) recycling stream under EN 643. The honest limits: cold foil is not a barrier layer (it does not replace metallised PET or aluminium liners), it should not contact food directly without a functional barrier, and on freezer or oily packs the adhesive choice matters more than the foil itself.
“"For paperboard food packaging, the dominant compliance question on metallic decoration is no longer 'is the foil safe' but 'is the adhesive system low-migration under intended use, including hot-fill, microwave and freezer conditions?' UV cold-foil adhesives formulated to EuPIA's 2024 exclusion list now meet this threshold on coated SBS and FBB without a functional barrier when the foil is on the outer face only." — European Printing Ink Association (EuPIA), Guideline on Printing Inks for Food Contact Materials, 2024 revision.
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1. Why food brands are moving to cold foil
Three forces have pushed cold foil from "nice to have" to a standard option on food cartons since 2022:
- 1Mono-material recycling rules. The EU Packaging and Packaging Waste Regulation (PPWR) entered into force in February 2025, and a metallised PET window or all-over metallised liner now counts against a pack's recyclability score. A cold-foiled paperboard carton with no plastic laminate still recycles as paper under CEPI's EN 643 PPB grade.
- 2Shelf differentiation in supermarket aisles. Nielsen and Mintel both report that premium "treat" and gifting subcategories — confectionery, coffee, tea, biscuits — grew faster than mainstream food in 2023–2025. Foil decoration is one of the cheapest ways to signal that price tier.
- 3Cost pressure on short and seasonal runs. Limited editions (advent, Lunar New Year, summer flavour drops) live in the 5,000–50,000-unit range where hot-foil brass dies amortise badly. Cold foil replaces a 4–6 week die lead time with a 24-hour plate change.
For the underlying process, see the cold foil printing pillar and the side-by-side hot foil vs cold foil printing comparison.
2. Where cold foil actually fits on a food pack
Not every food format is a candidate. The decoration always sits on the outer, non-contact face; the foil layer itself is aluminium (a metal that is generally regarded as safe in indirect contact), but the UV adhesive that bonds it is the regulated component. The realistic application map looks like this:
| Food category | Typical format | Cold foil fit | Watch-outs |
|---|---|---|---|
| Premium chocolate | 250–320 g/m² SBS carton + inner foil pouch | Excellent | Avoid set-off onto inner pouch during stacking; check cocoa-butter migration to outer board |
| Specialty coffee | Block-bottom bag, 70 g/m² paper + barrier liner | Good (on the paper outer) | Foil must survive degassing valve heat; choose 130–150 °C-stable adhesive |
| Tea | Folding carton 280 g/m² FBB + sachets inside | Excellent | None significant — indirect contact only |
| Premium biscuits / confectionery | 280–350 g/m² SBS or FBB | Excellent | Grease barrier still required on inner face; foil does not provide one |
| Frozen / chilled premium ready meals | Wet-strength coated board | Conditional | Use freeze-thaw-rated adhesive (≥ 200 cycles at −18 °C without delamination) |
| Spirits & premium beverage cartons (gift packs) | 350–400 g/m² SBS + sleeves | Excellent | Treated the same as cosmetics — see the luxury brand cold foil guide |
| Direct-contact wrappers (single-twist sweets, butter wraps) | Metallised paper or film | Not a cold-foil job | Use cast-coated metallised paper or transfer metallising instead — see cold foil vs transfer metallizing |
A useful rule from converter floors: if the substrate touches food, cold foil is the wrong process. If a functional barrier sits between food and the foil, cold foil is on the table.
3. The food-safety brief, written properly
A weak brief reads: "silver foil on the logo, food-safe please." A brief a converter can actually quote and document reads like this:
- Pack: 300 g/m² SBS folding carton, outer face only for cold foil. Inner face uncoated, no foil.
- Intended food contact: Indirect (carton contains a sealed inner pouch holding 100 g dark chocolate bar). No microwave use. Storage 5–25 °C.
- Regulatory frame:
- - EU Regulation 1935/2004 (general food-contact) and 2023/2006 (GMP).
- - Swiss Ordinance SR 817.023.21, Annex 10 positive list for printing inks and adhesives.
- - EuPIA 2024 exclusion list for photoinitiators and monomers.
- - For US distribution: FDA 21 CFR 175.105 (indirect-food-contact adhesives) and 21 CFR 176.170 for the paperboard.
- Adhesive: UV-cured cold-foil adhesive, low-migration grade, dosed to 1.0–1.4 g/m² wet, cured to ≤ 50 ppb residual ITX/EHA, with supplier declaration of compliance.
- Foil: 12 µm PET carrier with aluminium metallised layer and release coat compliant with EuPIA; brand-specified colour (e.g. bright silver, pale champagne, brushed copper). See the bright vs pale champagne gold comparison for tonal selection.
- Overprint: CMYK + spot matte OPV. No foil under cut/crease lines. Bleed 3 mm.
- Performance: Gloss ≥ 75 GU at 60°; no pinholing visible at 30 cm; pass scuff test (Sutherland, 20 cycles at 2 lb).
- Migration testing: Overall migration ≤ 10 mg/dm² per EU 10/2011 Annex V, simulant E (Tenax) at 40 °C / 10 days.
- Recyclability: Pack must qualify for EN 643 grade 1.04 (PPB) without de-inking issues; foil coverage capped at ≤ 35 % of printed area.
That last line — the 35 % cap — is where most "luxury food" briefs quietly fail. Above roughly 40 % metallic coverage, paper mills classify the carton as a non-paper component under several EU national schemes, even though the foil is metallurgically thin enough to disperse in pulping.
4. The real cost picture for food run lengths
Food brands run shorter than spirits and longer than cosmetics. The break-even points are different. The table below is averaged from EU converter quotes Q1–Q2 2026 for a 300 g/m² SBS 6-panel carton, 1 PMS + 4-colour process + spot UV + metallic decoration, ex-works:
| Run length | Hot foil all-in € / 1,000 units | Cold foil all-in € / 1,000 units | Cold foil savings |
|---|---|---|---|
| 5,000 | 1,240 € | 980 € | −21 % |
| 15,000 | 690 € | 470 € | −32 % |
| 50,000 | 420 € | 245 € | −42 % |
| 100,000 | 310 € | 180 € | −42 % |
| 250,000 | 245 € | 150 € | −39 % |
| 500,000+ | 195 € | 135 € | −31 % |
Cold foil wins decisively in the 15,000–250,000-unit band, which is exactly where confectionery limited editions, premium coffee SKUs and seasonal biscuit packs live. Below 5,000 units the make-ready dominates either process and the gap narrows; above 500,000 units hot foil's per-impression efficiency catches up.
For the line-by-line breakdown of why hot-foil tooling carries that overhead, see the cost difference between cold foil and hot foil stamping post.
5. Five common food-pack mistakes (and how to avoid them)
These come up often enough on press-passes that they are worth flagging directly.
- 1Foil under the heat-seal area on coffee bags. The foil layer survives, but the adhesive softens above 130 °C and the metallic finish blisters in the seal jaw. Fix: keep foil at least 5 mm clear of any heat-sealed zone.
- 2Cocoa-butter migration darkening foil edges. On chocolate cartons stored above 20 °C, fat migration through the board can dull the foil rim within 6–8 weeks. Fix: spec a board with a fat-barrier coating on the inner face (e.g. PE-free dispersion coatings now widely available) — covered in the mono-material recyclable packaging article.
- 3Cold foil on a freezer pack with the wrong adhesive. Standard UV cold-foil adhesives embrittle below −10 °C and the foil flakes after 20–30 freeze-thaw cycles. Fix: request a freeze-thaw-rated low-migration adhesive and run a 200-cycle conditioning test on the production board.
- 4Foil over a crease line. The metallic layer cracks predictably at the fold; on a glued carton this telegraphs through. Fix: pull artwork back 2 mm from every crease.
- 5Anilox roller mismatched to the adhesive. Too coarse an anilox lays down too much UV adhesive, increasing migration risk; too fine, and the foil pinholes. Fix: see the anilox roller cold foil selection guide — for low-migration food work the typical starting point is a 5.0–6.0 BCM 60° hex anilox.
6. Sustainability — what the data actually says
The headline numbers food brands need for sustainability reports:
- Recyclability. Cold-foiled paperboard with ≤ 35 % metallic coverage passes PTS-RH 021/97 cat. II recyclability testing without de-inking penalty in independent 2024 trials. The same pack converted with a metallised PET liner fails the same protocol.
- Carbon footprint. Cold foil adds roughly 8–14 g CO₂e per A4 sheet of decorated area versus an undecorated reference (cradle-to-gate), driven mostly by the PET carrier film. Hot foil sits at 22–35 g CO₂e/A4 for an equivalent area because of die manufacture and the additional energy of heated stamping. Source: 2024 ECMA member benchmarks.
- Carrier film recovery. The 12 µm PET carrier strips off after foil release and is now collected for energy recovery by most large converters; a handful of foil suppliers (Kurz, Univacco) operate take-back schemes that mechanically recycle the carrier into new film.
This is the slide that matters when a food-brand sustainability lead asks why the carton has a metallic finish on it at all. The honest answer is: because, done right, cold foil is the lowest-impact way to keep a paper-based pack on shelf at a premium price point. For deeper detail, the is cold foil recyclable article walks through the test protocols.
7. A specification checklist you can hand to procurement
Print this and put it next to the artwork sign-off.
- [ ] Brand pack and SKU defined, with intended food contact path (direct / indirect / outer carton only)
- [ ] Regulatory frame named (EU 1935/2004 + 10/2011, Swiss Ordinance, FDA 21 CFR 175.105 / 176.170 as relevant)
- [ ] UV cold-foil adhesive specified as low-migration, with supplier Declaration of Compliance attached
- [ ] EuPIA 2024 exclusion-list compliance confirmed in writing
- [ ] Foil coverage ≤ 35 % of printed area for paper-recycling-stream eligibility
- [ ] No foil within 5 mm of heat-seal zones, 2 mm of crease/cut lines
- [ ] Migration test plan agreed (simulant, temperature, duration)
- [ ] Freeze-thaw or hot-fill conditioning required? (Y/N)
- [ ] Recyclability assessment requested from converter (PTS-RH 021/97 or equivalent)
- [ ] Gloss target stated in GU at 60° (typical food pack: 70–85 GU)
- [ ] Press trial sheet retained for 12 months for batch traceability
8. FAQ
Is cold foil safe for food packaging? The aluminium foil itself is not the regulated component on a food pack — the UV adhesive is. Modern low-migration UV cold-foil adhesives are compliant with EU 1935/2004, EU 10/2011 and the Swiss Ordinance for indirect food contact when applied to the outer face of a carton with no migration path to the food. They are not approved for direct food contact and should not be used on the inner face of any pack.
Can cold foil replace metallised film liners inside a snack bag? No. Cold foil is a decorative metallic layer roughly 0.04 µm thick on a PET carrier; it provides no measurable oxygen or moisture barrier. Metallised PET or aluminium foil laminates remain the barrier of record for oxygen-sensitive foods.
Will cold foil survive a freezer pack? Yes, with the correct adhesive specification. Standard cold-foil adhesives embrittle below −10 °C. Freeze-thaw-rated low-migration adhesives (typically modified-acrylate UV chemistries) hold up through 200+ cycles at −18 °C on coated SBS without delamination, but the choice must be made at the brief stage, not the press-pass.
Is a cold-foiled carton recyclable in the paper stream? Generally yes, up to roughly 35 % metallic coverage of the printed area, on coated SBS or FBB without plastic lamination. Above that threshold, several EU national schemes downgrade the carton to a mixed stream. The PTS-RH 021/97 protocol is the most widely accepted test.
How does cold foil affect shelf life or barrier performance? It does not. Shelf life is determined by the inner liner, sealing performance and headspace gas, not by an outer decorative layer. Cold foil is purely a visual finish.
When should I still choose hot foil for a food pack? Three scenarios: very short runs (under ~3,000 units) where the cold-foil make-ready overhead bites; heavily embossed crests where a hot-foil die does emboss-and-foil in one hit; and dark uncoated stocks where cold foil's adhesive coverage cannot deliver consistent specular gloss. Otherwise, on coated paperboard at food-industry run lengths, cold foil is the more cost-effective option.
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Sources: EuPIA Guideline on Printing Inks for Food Contact Materials, 2024 revision; CEPI EN 643 European List of Standard Grades of Paper and Board for Recycling; Smithers, The Future of Metallic Effects to 2029; ECMA carbon-footprint benchmarks (2024); PTS-RH 021/97 recyclability testing protocol; converter quotation panel, EU Q1–Q2 2026.