PPWR & In-Mould Label (IML) Converters: BOPP Films, Mono-PP, the 1% Ink Rule & Removable IML

PPWR & In-Mould Label (IML) Converters: BOPP Films, Mono-Material PP Containers, the 1% Ink Rule and Removable IML

In-mould labels are everywhere consumers do not look for a label: ice-cream tubs, butter and margarine packs, dairy desserts, paint pails, household-chemical bottles, ready-meal containers and cosmetic jars. The decoration is not a sticker glued on — it is a printed BOPP or PE film placed in the injection or thermoforming mould and fused to the wall during shaping. That mono-material bond was, for fifteen years, IML's commercial story: photo-quality decoration with no adhesive, no liner waste, no second pass on the line. With Regulation (EU) 2025/40 the same bond becomes IML's biggest compliance question: under Articles 6, 7, 10, 12 and 39, an IML-decorated PP tub now has to prove it survives the recycling stream as a single recyclable unit, and the printer-converter is the one who issues the data.

The good news is that the European recycling consortium RecyClass has spent the last three years characterising IML on rigid PP containers and has published a clear answer: printed PP-based IML is compatible with the coloured rigid-PP recycling stream provided the total weight of the inks stays below 1% of the container weight. Above that threshold the construction drops down to limited compatibility. On the natural (uncoloured) PP stream the picture is harder — IML is classified as low compatibility because the label cannot be separated by sink-float from a same-density carrier. That single set of numbers — 1% ink, coloured stream only, removability as the unlock — is the operating reality every IML converter has to map onto every active SKU before the August 12, 2026 Article 39 Declaration of Conformity deadline.

Why IML Containers Still Need an Annex II Grade

PP and PE are fully in scope under PPWR. Each finished IML-decorated container needs an Annex II recyclability grade (A, B, C or below), a Declaration of Conformity per Annex VIII, recycled-content evidence under Article 7 from 2030, and a structured data block ready for the Digital Product Passport from August 28, 2027. The grade is not assigned to the bare tub — it is assigned to the container plus its decoration, closure, lidding film and any tamper-evident seal. So the container moulder cannot publish a grade in isolation; the IML printer-converter is co-responsible for the printed film, the ink load, the slip masterbatch chemistry and the metallic-effect coverage that all go into that grade.

Reference protocols are RecyClass REP-PP-01 v6.1.0 (printed and unprinted PP rigid containers), RecyClass REP-PE-01 for HDPE pails, Cyclos-HTP for the German market and EN 13430as the underlying CEN baseline. None of these documents was written for PPWR — they pre-date the regulation — but the European Commission's implementing act expected in late 2026 will adopt them as the harmonised methodology for Annex II Table 3 grading. The IML converter that has already pre-graded its full library against the RecyClass protocol enters the August 2026 deadline with a defensible position; the converter that has not is starting the clock.

The IML Converter Obligation Stack

The Grade-Killers on an IML PP Container

The RecyClass test method runs an IML-decorated tub through grinding, washing, sink-float, hot-wash and re-pelletising; the resulting compound is then assessed for colour shift, gel count, odour and mechanical degradation against virgin PP. The same five items keep dragging otherwise-clean constructions down the grade ladder.

The 1% Ink Rule and Why It Is the Hardest Number in IML

RecyClass's evaluation of printed PP-based IML, refreshed in the 2025 protocol cycle, confirms that the technology is fully compatible with the coloured rigid-PP recycling stream when the total ink weight is below 1% of the container; above that threshold the compatibility drops to limited. For a 100 g ice-cream tub, 1% of the container weight is 1 g of dry ink. On a 360 mm-wide IML offset or flexo press running at 12 g/m² wet ink with 60% solids, that 1 g budget is consumed by roughly 230 cm² of solid coverage — the area of a single side of a typical 500 ml round tub. Designs that wrap the tub with full-bleed darks, two-sided photographic decoration or solid black bases burn through the budget. Brand-owner artwork teams have rarely been told to track ink coverage in grams; converter pre-press and CMS workflows now have to compute it per SKU and feed it into the Annex VIII DoC pack.

Removable IML: The Natural-PP Stream Unlock

IML on natural PP is the harder problem. Because the printed film is co-moulded into the wall, sink-float cannot separate it; the dark inks bleed through into a transparent or pastel container fraction intended for cosmetic and HPC re-use. Two technology routes have emerged to solve this. MCC Verstraete's NextCycle IML and Propyplast's LMG CleanLoop IML have both achieved RecyClass approval for compatibility with the natural-PP rigid stream under defined ink-load and surface-coverage rules. These removable IML systems use a wash-off interface (a thin, water-soluble or alkali-sensitive layer) that releases the printed BOPP from the container body during the hot caustic wash step typical of the natural-PP recycling line. For brand owners targeting cosmetic mass-balance recycled-PP procurement under Article 7, specifying a RecyClass-approved removable IML is becoming a procurement default.

Cast PP, BOPP, PE: Material-Specific Notes

Most thermoformed dairy and ice-cream tubs use a cast PP IML film (typically 60–90 microns) because it bonds at lower mould temperatures and stretches with the container during deep thermoforming. Injection-moulded margarine, paint and food-storage containers use BOPP IML film (typically 50–80 microns) for stiffness, transparency, gloss and printability with UV-flexo, offset and increasingly toner-based digital. PE-based IML is reserved for HDPE pails (paint, lubricants, foodservice buckets) where the container itself is polyethylene; the label film must match the container polymer. Mixing polymers is the single most common technical error: a BOPP IML on an HDPE pail collapses both streams.

Specifically for BOPP IML, the move to PPWR-friendly grades has been led by suppliers including Jindal Films, Taghleef Industries (Ti), Innovia Films and Profol, all of whom now offer PFAS-free, mineral-oil-free, lower-density grades engineered for higher RecyClass scores. Slip-masterbatch chemistry is the key migration vector: traditional PTFE slip aids fall under the Article 5 Annex V PFAS ban for food-contact applications, and erucamide/oleamide alternatives have to be qualified for migration under the EU Plastics Regulation 10/2011 and Swiss Ordinance RS 817.023.21.

The Data Handoff: What Brand Owners Will Demand

From August 12, 2026 every brand-owner Declaration of Conformity must trace back to its supplier data. For IML printer-converters, that means a structured, machine-readable specification sheet per SKU containing at least:

• Base film polymer (cast PP / BOPP / PE), grammage in g/m², thickness in microns, slip-masterbatch chemistry
• Ink chemistry (UV-offset, water-based flexo, UV-flexo, toner digital), pigment list, EuPIA Suitability List status
• Total dry ink load per container in grams and as % of container weight (for the 1% rule)
• Surface coverage % per face and total wraparound coverage
• Adhesive interface (heat-bond mono-PP, NextCycle, LMG CleanLoop, removable wash-off layer)
• Container polymer (PP/HDPE), wall thickness, recyclate share, mass-balance ISCC PLUS evidence
• RecyClass REP-PP-01 v6.1.0 or REP-PE-01 test report with predicted Annex II grade
• Migration test pack (EU 10/2011 OML/SML, Swiss Ordinance) for food-contact use cases
• Confirmation of PFAS-free slip masterbatch and Annex V heavy-metal compliance
• Sorting pictogram, polymer code and DPP-ready data block per Article 12

Converters who can publish this back to brand-owner procurement as a structured data export — not a scanned PDF — will be the ones taking share through the August 2026 cut-over. Major IML players including MCC Verstraete, Inland Packaging, EPL (Essel Propack), Multi-Color Corporation and Constantia Flexibles have all announced PPWR data-portal initiatives on the converter side. Mid-size IML printers without a data pipeline will struggle to clear brand-owner qualification by Q3 2026.

Action Plan for IML Label Converters

• Inventory every active IML SKU and pre-grade against RecyClass REP-PP-01 v6.1.0. Segment into A/B (safe), C (borderline), below-Grade-C (banned 2030). Pay close attention to metallic and dark-flood designs.
• Run an ink-load census per SKU. Compute dry ink mass per container and the % of container weight. Designs above 1% need redesign — increase white knock-out, drop solid black backgrounds, switch dark-on-dark to overprint structures.
• Eliminate carbon-black masterbatches in the IML film and dark inks. Migrate to NIR-detectable alternatives (Lanxess Macrolex, BASF Sicopal, Cabot UN2025) for any dark area on the container or label.
• Audit slip-masterbatch chemistry for PFAS and bring food-contact migration packs forward. PTFE slip aids are out under Annex V from August 12, 2026; erucamide/oleamide alternatives need OML/SML migration testing under EU 10/2011 and Swiss Ordinance compliance.
• Specify removable IML (NextCycle, LMG CleanLoop) for natural-PP applications. Brand-owners running cosmetic, HPC and food jars on natural PP and targeting Article 7 mass-balance rPP procurement are increasingly making removable IML a tender requirement.
• Migrate to PFAS-free, mineral-oil-free BOPP and cast PP grades. Confirm Jindal, Taghleef, Innovia and Profol grade-changes through your converting line; revalidate die-temperature windows and bond strength in the moulder.
• Stand up a structured DoC / DPP data pipeline. Every SKU needs a machine-readable spec sheet covering film, ink, container, RecyClass test and recycled-content evidence; brand-owner PDFs will not scale past a few hundred references.
• Engage early with the moulder customer. The grade is a property of the full container + IML + closure stack; converters that present pre-graded label proposals to thermoformers and injection moulders save weeks of qualification time.

How PPWR Connect Helps IML Label Converters

IML decoration is one of the few categories where the printer-converter and the container moulder share the recyclability grade — and where the converter's choice of base film, ink chemistry, coverage, slip-masterbatch and adhesive interface directly determines whether the unit lands as grade A, B, C or below. PPWR Connect gives IML printer-converters a single platform to inventory every active SKU, run automated RecyClass REP-PP-01 v6.1.0 / REP-PE-01 grading on the full film + ink + masterbatch + container stack, automate the 1% ink-load calculation per artwork, intake migration and PFAS evidence, track removable-IML qualification status (NextCycle, LMG CleanLoop) and produce audit-ready Declarations of Conformity per market. Converters use the same platform to publish machine-readable component specifications back to the moulder and to the brand owner — turning PPWR compliance from a reporting burden into a tender-winning differentiator. With the August 12, 2026 deadline now three months away, the IML converters that finish their grade audit and ink-load re-design today are the ones that will hold their job book into 2030.