This is where we write down what we know. Barrier structures, mono-material design, recycled-content documentation, and what packaging regulation now requires of brand owners and converters — covered in enough technical depth to be useful, and in plain enough language to be read by someone who has to make a decision this quarter.
No product pitches here. If a guide ends up recommending a structure we supply, that is because it is the right structure — and where it is not, we will say so.
What we cover
Recyclability and compliance. Design-for-recyclability requirements, mono-material structures, the difference between recyclability and recycled content, and how chain-of-custody certification actually works in practice.
Barrier technology. What metallizing actually buys you, where coated films belong, how foil laminates are structured, and why a barrier figure measured on a flat film is not the figure your pack will deliver.
Materials and structures. BOPA, BOPET, BOPP and PE — what each is good at, what each is bad at, and how to combine them without over-engineering the pack.
Converting practice. Selection logic, sealing qualification, flex-crack and pinhole risk, and the questions worth asking a supplier before you commit to volume.
Guides and technical references
| Guide | What it answers |
|---|---|
| Mono-Material Packaging: Designing PE Film That Actually Recycles | Why multi-layer laminates fail in recycling, and how an all-PE structure solves the barrier problem |
| PE Metallized Film: Two Layers Instead of Three | How a two-ply structure carries the duties of a three-ply laminate, where the savings come from, and what you give up |
| Metalized PE Film (VMPE): Technical Guide | VMPE film specification — LLDPE base, vacuum aluminizing, −40 °C to +80 °C performance, lamination options |
| Metallized Films | Substrate comparison and the WVTR improvement from vacuum metallizing, by base film |
| Coated Films (PVDC & Acrylic) | The eleven coated configurations we supply and which barrier each one delivers |
| BOPA Nylon Film | How biaxially oriented nylon is made, and what it is and is not good for |
Technical data worth bookmarking
The WVTR comparison table on our metallized films page shows moisture transmission for six base films before and after metallizing. The BOPA row is the one people come back for: a 15 µm nylon film drops from 250–290 g/(m²·24h) to 0.5–0.8 after metallizing — roughly two and a half orders of magnitude, in one processing step, on the same film.
From our own record
2023 — Demand for our mono-material recycling solutions (metallized PE and high-barrier PE) grew 110% year on year, as brand owners’ sustainability commitments moved from policy statements into procurement.
2019 — OLUNRO established a partnership with Sealed Air, following the shared move toward recyclable, lightweight and degradable packaging formats. A dated announcement, kept here for the record.
How we write these
Three rules we hold ourselves to:
- No invented numbers. If we have not measured it, we do not state it — and where a figure comes from our own sales record rather than an industry study, we say which.
- State the limits. A guide that only lists advantages is a brochure. Every structure has a boundary, and the boundary is usually the useful part.
- Confirm the regulation. Regulatory text changes. We describe direction and implication, and we tell you to verify current requirements with your compliance team rather than acting on our summary.
Working on a packaging decision now?
If a guide has not answered your question, ask us directly. We run coating, metallizing, lamination, slitting and bag-making in-house and hold GRS certification under Intertek TE-00352946 with per-shipment Transaction Certificates.
Send the contents, the shelf-life target and the machine — we will tell you what structure we would use, and what we would not.
Contact: info@olunropack.com · +86 532 6776 6956