Latest / The Manufacturing Podcast with Fexingo: Factories, Supply Chains, and Industrial Business / How a French Factory Turns Textile Waste Into New Fabric
Transcript
- Lucas: Let me take you to Roubaix, northern France — a town that was basically the epicentre of French textile manufacturing in the nineteenth century. Wool, cotton, linen, it all flowed through there. By the 1970s, most of the mills had closed, chased by cheaper labour overseas. Luna: Right, the classic story of deindustrialisation. But Roubaix has been trying to reinvent itself as a hub for circular textiles. Lucas: Exactly. And there's one factory in particular I want to focus on. It's a plant that takes post-consumer textile waste — your old T-shirts, jeans, even blended fabrics — and turns it back into high-quality fibre that can be rewoven into new clothing. The company is called TexRecycle, though the factory itself goes by the name of the original mill: Filature du Nord. Luna: I've heard of them. They're one of the few facilities in Europe doing both mechanical and chemical recycling under one roof. Lucas: And that's the key angle. Most textile recycling operations pick one route. Mechanical shredding is cheaper and works well for pure cotton, but the fibres get shorter each time, so you eventually need to blend with virgin fibre. Chemical recycling can break polyester back down to its monomers and rebuild it fresh, but it's energy-intensive and expensive. Filature du Nord does both, and they've figured out how to sort and route the waste stream intelligently. Luna: So it's not just a feel-good story — there's real process engineering behind it. And before we go deeper, I want to mention something quickly. If you're a regular listener, you might wonder how we make this many episodes without being buried in ads. Lucas: Yeah, it's a fair question. The short answer is that a small group of listeners chips in monthly through buy me a coffee dot com slash fexingo. And that genuinely covers the production costs. It's not a big ask — just that if these conversations have moved your work forward in some small way, that's the thing that keeps it going, ad-free. Luna: Exactly. No pressure, just the reality. And we really appreciate the people who do. So back to Roubaix — how does the sorting actually work? Lucas: So the waste comes in bales from collection points across France and Belgium. The first step is near-infrared optical sorting, similar to what you'd see in a plastics recycling plant. The machines identify fibre composition — is it 100% cotton, a cotton-polyester blend, maybe with some elastane. That determines which line it goes to. Luna: And the purity matters because mechanical recycling can't handle blends well. If you shred a polyester-cotton mix, you get a messy short-fibre output that's hard to spin. Lucas: Right. So pure cotton goes to the mechanical line. They cut off buttons and zippers — that's manual labour, by the way, about thirty people on tables — then shred the fabric into fibres. Those fibres are carded, drawn, and spun into new yarn. The key metric here is fibre length retention. Virgin cotton fibres are about 25 to 35 millimeters. After one mechanical cycle, that drops to maybe 15 to 20. After two cycles, you're down to 10 or less, which is too short for most apparel. Luna: So you can't infinitely recycle cotton mechanically. At some point you need to blend in virgin fibre or use chemical recycling to rebuild the polymer chain. Lucas: Exactly. And that's where the chemical line comes in for the blends. For polyester-cotton, they use a process called thermochemical depolymerisation. They heat the fabric in a closed reactor with a solvent — typically ethylene glycol — to break the polyester down into its monomers, BHET and then purified terephthalic acid. The cotton, which is cellulose, doesn't dissolve under those conditions, so it can be filtered out and processed separately. Luna: So you get two usable streams: a cellulose pulp that can be turned into viscose or lyocell, and a pure polyester monomer that can be repolymerised into new polyester fibre. That's surprisingly elegant. Lucas: It is. And the economics are slowly improving. Right now, recycled fibre from Filature du Nord costs about 15 to 25 percent more than virgin polyester or cotton. That premium comes down to the sorting labour, the chemical processing, and the fact that the plant runs at about 70 percent capacity because the supply of sorted, clean waste isn't yet reliable enough. Luna: But brands are paying it. I saw that Patagonia and H&M have both signed multi-year offtake agreements with TexRecycle. That suggests they're betting the cost gap will shrink. Lucas: They are. And there's a regulatory tailwind. The EU's Ecodesign for Sustainable Products Regulation comes into force in stages, but starting in 2026, textiles sold in the EU must contain a minimum percentage of recycled fibre — starting at 15 percent for polyester and climbing to 25 percent by 2030. That creates a guaranteed demand pool. Luna: That's huge. Suddenly every brand with a European supply chain needs recycled content, and there aren't many facilities that can provide it at scale. Filature du Nord's current output is about five thousand tonnes per year. That's a drop in the bucket compared to the millions of tonnes of textile waste generated annually. Lucas: Right, they're planning a second line that would double capacity by 2027. But the bottleneck isn't just plant capacity — it's collection and sorting infrastructure. Most textile waste is still incinerated or landfilled because municipalities don't have the systems to separate it properly. Luna: And that's the part that doesn't get enough attention. The recycling technology exists. The factory works. But you need a predictable, clean feedstock to make it profitable. Right now, the supply chain is the weak link. Lucas: Exactly. So the factory itself is almost a proof of concept. The real question is whether we can build the reverse logistics at the same scale. France passed a law in 2022 requiring separate textile collection by all municipalities by 2025 — that deadline hasn't been fully met, but progress is happening. Luna: And once you have the sorted waste, you still need to handle the colour variation. How do they deal with that? I imagine you can't just mix red and blue T-shirts and expect a nice neutral. Lucas: They don't. The optical sorters also detect colour, so they batch by colour family. The mechanical line can produce fibre in specific shades — grey, navy, earth tones — and brands use that as part of their aesthetic. For the chemical line, colour doesn't matter because the depolymerisation strips the dye away. The output monomers are colourless, so you can dye the new fibre any colour you want. Luna: That's a neat advantage of chemical recycling. It decouples the input colour from the output colour. Mechanical recycling is stuck with whatever colour the waste stream had. Lucas: Right. So the factory is really a hybrid model. They're running both processes in parallel, routing each stream to the most efficient technology. And they're also experimenting with what they call 'fibre to fibre' recycling of wool — using a milder chemical process that dissolves the wool's protein structure and then regenerates it. That's still at pilot scale. Luna: Wool is tricky because the fibres have scales that matt together. But if they can crack that, it opens up another big waste stream — think old suits, jumpers, blankets. Lucas: Exactly. So the plant in Roubaix is not just a single factory story. It's a window into how the entire textile industry is trying to shift from a linear to a circular model. The technology is largely proven. The economics are close but not quite there without regulatory support. And the logistics are still catching up. Luna: It feels like a lot of the pieces are finally clicking into place. I wonder if in ten years we'll look back at 2026 as the year the textile recycling industry really started to scale. Lucas: That's the hope. And if factories like Filature du Nord can demonstrate real profitability at scale, the investment will follow. There's no shortage of venture capital interested in circular textiles — the challenge is showing unit economics that work without subsidies. Luna: And on that note, I think we've given our listeners a lot to think about. Thanks for joining us on The Manufacturing Podcast. We'll be back next time with another factory deep dive.