PPWR & Paper Bag and Multiwall Sack Converters: Kraft Construction, PFAS-Free Greaseproof, PE Liners and 4evergreen Grading
PPWR & Paper Bag and Multiwall Sack Converters: Kraft Construction, PFAS-Free Greaseproof, PE Liners and 4evergreen Grading
Multiwall paper sacks for cement, animal feed, pet food, flour and milk powder; SOS and pinch-bottom bags for bakery and takeaway; kraft mailers for e-commerce; bread bags, charcoal bags and butcher liners — paper bag and sack converters operate the second-largest fibre-print segment in Europe and sit squarely in scope of Regulation (EU) 2025/40. The fibre construction itself is almost always a grade A or B starting point. What knocks a well-engineered kraft sack down to grade C or below is consistently a polymer inner liner, a fluorinated greaseproof treatment, an aluminium-foil moisture barrier or a hot-melt seal that survives repulping as a sticky.
That puts Articles 5 (restricted substances), 6 (recyclability grading), 7 (recycled content for any plastic component), 10 (minimisation), 24 (e-commerce empty space) and 39 (Declaration of Conformity) directly on the converter — the bag plant, the sack mill, the e-commerce mailer line — even when the brand owner contracts the sale. With August 12, 2026 less than four months away, this is the printer-side playbook.
Why Paper Bags and Sacks Still Need an Annex II Grade
Kraft paper bags and multiwall sacks are fully in-scope for PPWR. Each construction needs a recyclability grade under Article 6 and Annex II Table 3 (A, B or C), and each unit needs a Declaration of Conformity under Article 39 and Annex VIII. Fibre-based sack constructions are graded through the CEPI Recyclability Laboratory Test Method for Paper and Board Packaging (v2) and the 4evergreen Recyclability Evaluation Protocol (v2.1), which measure coarse and fine rejects, optical performance, stickies load and fibre yield after repulping. EUROSAC's independent RISE testing has shown unprinted single-ply kraft sacks score above 90 on the EPRC scale; the same sack with a 30% PE inner liner can drop below grade C.
The converter's levers are narrow but determinative. The kraft itself is recyclable; what the bag plant adds — barriers, liners, coatings, glues, inks and closures — decides the grade.
The Paper Bag & Sack Obligation Stack
| Obligation | PPWR Article | Deadline | What the Bag / Sack Converter Must Do |
|---|---|---|---|
| Heavy-metal limit (Pb + Hg + Cd + Cr(VI) < 100 mg/kg) | Article 5 & Annex V | In force (Jan 1, 2026) | Audit flexo and offset inks, varnishes and dyestuffs; remove cadmium and lead chromate pigments from bag-print recipes |
| PFAS ban in food-contact packaging | Article 5 & Annex V | August 12, 2026 | Eliminate fluorinated greaseproof treatments on bakery, pet-food, takeaway and butcher-paper bags; document molecule-level PFAS-free supplier declarations |
| Recyclability grade per construction (Annex II Table 3) | Article 6 & Annex II | August 12, 2026 | Validate each sack and bag reference via CEPI / 4evergreen test; below-grade-C constructions are banned from January 1, 2030 |
| Recycled content for plastic components (PE liners, valves) | Article 7 | January 1, 2030 (first targets) | Source PCR-PE for inner liners and valve patches via mass balance (ISCC PLUS) or product-specific certificate |
| Declaration of Conformity per packaging unit | Article 39 & Annex VIII | August 12, 2026 | Issue a DoC per SKU listing kraft grammage, ply count, inner-liner chemistry, glue, inks and CEPI / 4evergreen result |
| Minimisation (volume & weight) | Article 10 & Annex IV | August 12, 2026 | Justify every ply, every gusset, every inner liner; document the technical reason a single-ply kraft cannot replace a two-ply or PE-laminated reference |
| E-commerce empty space < 50% | Article 24 | January 1, 2030 | For paper mailers and e-commerce envelopes, design for SKU-fit; offer multiple sizes or right-sized auto-bagging to brand-owner customers |
| Digital Product Passport data | Article 12 | August 28, 2027 (DPP); August 12, 2028 (harmonised pictograms / sorting instructions) | Provide structured data (kraft grade, fibre origin, inner-liner chemistry, glue, ink) for QR-readable DPP and harmonised sorting label |
The Five Grade-Killers on a Kraft Sack or Paper Bag
Across CEPI and 4evergreen test results, the same five components consistently knock otherwise-clean kraft sacks and paper bags from grade A down to C or worse. Every multiwall sack plant, SOS-bag line and paper-mailer extruder needs a remediation path for each.
| Component | Grade Impact | What the Converter Must Do |
|---|---|---|
| PE inner liners and PE-extruded moisture-barrier sacks | Non-fibre content above 5% by weight fails repulping; can drop a sack from A to grade C or lower | Switch to mono-paper constructions with aqueous-dispersion barriers (BillerudKorsnäs Performance White, Mondi EcoVantage, Stora Enso AvantForte), or design a PE liner that the user can mechanically separate from the kraft body |
| Fluorinated (PFAS) greaseproof treatments | Banned outright Aug 12, 2026 in food contact under Article 5 and Annex V; also poisons deinking sludge | Migrate bakery and pet-food bags to PFAS-free greaseproof papers (Nordic Paper Grease Resistant, Mondi BarrierPack, BillerudKorsnäs FibreForm grease-resistant); collect supplier declarations confirming intentionally-added PFAS at 0 ppm |
| Aluminium-foil moisture barriers (multiwall sacks for milk powder, infant formula) | Aluminium content above 5% disqualifies from the fibre stream; non-deinkable | Replace foil layer with metallised paper or SiOx / AlOx vapour-deposited barrier on a paper substrate; document non-aluminium recipe and target above 90% paper share by weight |
| Hot-melt and pressure-sensitive cold-seal adhesives | Sticky contaminants; classified as "stickies" under INGEDE Method 12 and bind to felts on the recycling line | Use alkali-dispersible or water-washable hot-melts (HB Fuller Advantra Roll-On, Henkel Technomelt Supra ECO) on bottom-pasting and side-seam lines; record INGEDE Method 12 stickies result per reference |
| Solvent-based flexo inks and high-coverage UV varnishes | Non-deinkable; high stickies load in INGEDE Method 11 | Switch to water-based flexo inks (Siegwerk NutriCirc, Sun Chemical SunFlex), low-migration LED-UV for spot work, and cap full-area varnish to deinkable references; document INGEDE Method 11 deinkability score |
The Mineral Oil Problem in Recycled-Fibre Bag Stocks
Bag converters using recycled kraft for non-food applications (carrier bags, hardware, e-commerce mailers) increasingly face questions about cross-contamination from bag stocks that may end up in the food chain via downstream recycling. PPWR itself does not set MOSH/MOAH limits, but Article 5 requires that packaging minimises the presence of substances of concern, and the German LFGB §28 Recommendation and Swiss Ordinance RS 817.023.21 effectively force a functional barrier into any recycled-kraft bag intended for direct dry-food contact. Converters of bakery bags, flour bags, dry pet-food sacks and breakfast-cereal sleeves should either use virgin kraft for the food-contact face or specify a barrier paper (PVOH-coated, water-based dispersion or SiOx-coated) for the food-contact ply.
Paper Mailers: The E-Commerce Empty-Space Pressure
Paper e-commerce mailers — kraft padded mailers, honeycomb-padded envelopes and curbside-recyclable cushioned bags — are a fast-growing segment for converters such as Mondi, Smurfit Westrock, ProAmpac and Sealed Air. Compliance pain on this format is concentrated in three places. First, the cushioning layer: bubble-wrap inserts and PE-foam liners disqualify the mailer from the fibre stream and need to be replaced with crumpled-kraft, honeycomb-cut paper or shredded-recycled-paper cushioning. Second, the closure: pressure-sensitive cold-seal adhesives must clear INGEDE Method 12 as repulpable stickies. Third, Article 24's 50% empty-space limit, which applies to e-commerce shipments from January 1, 2030 — paper mailers must be offered in enough size increments that the brand-owner or 3PL can pick a SKU-fit envelope for each order, or the converter must invest in right-sized auto-bagging lines (Sparck Technologies CVP, Quadient PacDrive) for fulfillment customers.
Multiwall Sacks for Building Materials and Industrial Products
Cement, plaster, mortar, lime, gypsum, animal feed and seed sacks are the EUROSAC heartland — and they enjoy a structural advantage under PPWR. RISE's independent recyclability testing for EUROSAC found that used cement sacks score around 83 on the European Paper Recycling Council scale even after construction-site contamination, and unprinted single-ply kraft scores above 90. The challenge for industrial sack converters is two-fold. First, valve patches and seam reinforcements often use PE film: keep these below the 5% non-fibre threshold or switch to fibre-only valve constructions. Second, brand-owner Article 39 DoCs now demand structured data on every component (kraft grade, valve film, perforation pattern, glue, ink, recycled-content share for any plastic part) — so the sack mill needs a structured spec-sheet pipeline per SKU, not a stack of scanned PDFs.
The Data Handoff: What Brand Owners Will Demand from Bag and Sack Converters
From August 12, 2026, every brand-owner Declaration of Conformity under Annex VIII must trace its evidence back to supplier data. For paper bag and multiwall sack converters that means having a structured, machine-readable specification per SKU containing at least:
- Kraft grade, grammage (g/m²) per ply, ply count, fibre origin (FSC/PEFC), virgin vs recycled share
- Inner-liner chemistry (PE, mono-paper barrier, aqueous dispersion, SiOx), weight per unit, separability classification
- Greaseproof or moisture treatment chemistry — confirmed PFAS-free with supplier declaration to molecule level
- Ink chemistry (water-based flexo, low-migration LED-UV), pigment list, MOSH/MOAH test report for food-contact references
- Hot-melt and cold-seal supplier and chemistry; INGEDE Method 12 stickies classification; INGEDE Method 11 deinkability score
- Valve film and seam reinforcement chemistry, weight per unit, recyclability classification
- CEPI / 4evergreen test report with predicted Annex II grade per construction
- Recycled content share with mass balance (ISCC PLUS) or product-specific certificate for any plastic component (PE liners, valves, mailer cushioning)
- Confirmation of Annex V heavy-metal limit and intentionally-added PFAS at 0 ppm
- Sorting pictogram, paper material code (PAP 22), DPP-ready structured data block per Article 12
Mondi, Smurfit Westrock, BillerudKorsnäs, Klabin and Nordic Paper have all announced PPWR data-portal programmes on the converter side. The commercial signal is clear: a multiwall-sack mill or paper-bag plant that can publish a structured component spec back to brand-owner procurement — not a scanned PDF — is going to win share against converters that cannot.
Action Plan for Paper Bag and Multiwall Sack Converters
- Audit every active SKU against Annex II — segment into A/B (safe), C (borderline), below grade C (banned 2030). For sacks pay special attention to PE inner liners, aluminium-foil plies and full-area varnish. For SOS / pinch-bottom bags pay attention to greaseproof treatments and cold-seal chemistry.
- Eliminate PFAS now — bakery bags, pet-food sacks, fast-food bags, butcher paper, popcorn bags and microwave-popcorn liners. Article 5 plus the August 12, 2026 food-contact deadline forbids intentionally-added PFAS; document supplier declarations to the molecule level.
- Migrate off PE liners and aluminium foils — qualify aqueous-dispersion-coated kraft, SiOx- or AlOx-coated paper, or mechanically separable PE inner bags; target paper share above 90% by weight.
- Switch flexo and offset to water-based and low-migration inks — eliminate solvent-based flexo on food-contact references; cap UV varnish coverage to deinkable thresholds.
- Validate deinkability and repulpability — book INGEDE Method 11 (deinking) and Method 12 (stickies) tests per construction; archive results in the DoC file.
- Address MOSH/MOAH in recycled-kraft food bags — specify a functional barrier or virgin-kraft food-contact ply; document Swiss Ordinance and LFGB §28 conformity.
- Right-size paper mailers— extend the SKU range, qualify recyclable cushioning and invest in auto-bagging for fulfillment customers ahead of Article 24's January 1, 2030 50% void-volume cap.
- Stand up a structured DoC and DPP pipeline — every SKU needs a machine-readable spec sheet ready for brand-owner RFQs; PDFs will not scale past a few hundred references.
How PPWR Connect Helps Paper Bag and Multiwall Sack Converters
Paper-based bag and sack constructions are where PPWR Articles 5, 6, 7, 10, 12, 24 and 39 land on a single multiwall sack, SOS bag, paper mailer or pinch-bottom bag — and where the converter's choice of kraft grade, ply count, inner liner, barrier coating, ink, varnish, glue and closure decides whether the unit lands as grade A, B or C. PPWR Connect gives multiwall-sack mills, paper-bag plants and e-commerce mailer converters a single platform to inventory every active construction, run automated Annex II grading on the full kraft + barrier + ink + glue stack, intake CEPI / 4evergreen / INGEDE test reports, track PFAS elimination on food-contact bags, model Article 24 paper-mailer void-volume scenarios, and produce audit-ready Declarations of Conformity per market. Converters use the same platform to publish machine-readable component specifications back to their brand-owner customers — turning PPWR compliance from a reporting burden into a tender-winning differentiator. With August 12, 2026 less than four months away, the bag and sack converters that start structured data collection and PFAS / PE-liner migration today are the ones that will hold their job book into 2030.