How a Single Rivet Can Jam a Trillion-Dollar Circular Economy? The Design Debt Behind Green Machine

In March 2023, at the intertextile Shanghai Spring & Summer Exhibition, Edwin Keh, CEO of the Hong Kong Research Institute of Textiles and Apparel (HKRITA), stepped onto the stage and showed the data of a machine to hundreds of fabric suppliers and brand representatives in the audience: within two hours, it can decompose an old poly-cotton blended shirt into two parts—polyester fibers pure enough to be directly re-spun, and cotton powder that can be sent for regenerated cellulose fiber production. Polyester recovery rate exceeds 97%. No water, no toxic chemicals, and the entire unit can be operated inside a standard shipping container.

The reactions in the audience were divided into two camps. The technical people had shining eyes, asking about equipment cost and energy consumption data. The brand people politely applauded, but in their minds they were calculating a different equation: to smoothly feed this old shirt into the machine, they must first remove the polyester sewing thread on the collar—if it is a poly-cotton blended thread, it cannot simply follow the cotton component into the chemical recycling route. If the shirt also has metal buttons, resin buttons, or a row of decorative rivets from a seasonal fashion trend, it gets even more troublesome: once a rivet gets into the opening equipment, at best it causes a shutdown for cleaning, at worst it damages the blades. The Ellen MacArthur Foundation's 2019 "Jeans Redesign Guidelines" explicitly recommends against using metal rivets—not because they are not eco-friendly, but because they are not easily removable. The conventional practice for recyclers facing rivets is to cut off the upper part of the denim fabric, sending it to landfill or incineration.

This is the most paradoxical aspect of the textile circular economy. Laboratory technologies are advancing fast—Green Machine, Renewcell's Circulose dissolving pulp, Worn Again's solvent-based recycling, Resortecs' heat-dissolvable sewing threads—each alone can tell a beautiful story of technological breakthrough. But when these technologies enter the real world, they collide not with another technology, but with an older enemy: products have already locked their own recycling fate at the design stage, and behind the design decisions lies a whole set of interest distribution mechanisms that no one is willing to pay for voluntarily.

What this article aims to do is to follow this "connection failure" and dig deeper. We start from a single rivet, move toward the commercialization reality of Green Machine, then detour to the deadlock of sneaker recycling, the silent losses of Bangladeshi cotton, the cross-sector collaboration experiments in Turkey, and finally return to a question the industry is not yet ready to face: when the technology is ready, who pays for 'design for recycling'?

1. What Exactly Does Green Machine Solve—and What It Doesn't Solve

Let's first unpack the technology itself. The textile industry produces approximately 63 million tons of polyester fiber and 25 million tons of cotton annually, of which about 15 million tons are used in poly-cotton blended products. Poly-cotton blend is one of the most cost-effective fabric solutions—polyester provides stiffness and durability, cotton provides moisture absorption and hand feel—but from a recycling perspective, it is the worst: the chemical and physical properties of the two fibers are completely different. Mechanical recycling tears them into a short-fiber mixture that cannot be spun into good yarn; chemical recycling must first separate them, and conventional methods are either costly or environmentally damaging.

Green Machine's breakthrough lies in using a "hydrothermal method" to solve both separation and environmental issues simultaneously. It puts poly-cotton blended textiles into a high-temperature, high-pressure reactor, adds biodegradable green chemicals, and utilizes the different responses of polyester and cotton to hydrothermal conditions—polyester hydrolyzes into monomers or oligomers, cotton decomposes into cellulose powder—achieving separation in a closed-loop system. Water and heat energy are recycled, and only small amounts of biodegradable chemicals are consumed. According to data from the H&M Foundation and HKRITA collaboration, the polyester recovery rate exceeds 97%, and the entire process takes about two hours.

This is currently one of the few recycling technologies worldwide that can simultaneously handle poly-cotton blends and has achieved industrial-scale operation. PT. Kahatex, Indonesia's largest textile company, first introduced Green Machine in 2020, becoming the world's first factory to commercialize the technology. In May 2022, Kahatex began trial operation of a system with a daily output of 25 tons. Denim fabric supplier ISKO has also joined the users. The H&M Foundation states that ISS Group is using Green Machine to separate polyester from used uniforms, supporting its 2040 full-scope net-zero emissions target.

But if we plot Green Machine on an axis of "technology - scaling - commercialization," its current coordinates are: technical principle verified, industrial prototype operational, but one bridge remains unbuilt before it can truly change the global recycling flow of poly-cotton blended textiles. That bridge is not technology—it is feedstock.

To run a Green Machine at full capacity, a stable daily supply of 25 tons of poly-cotton blended post-consumer textiles is needed. The question arises: where do these textiles come from? Who collects them? Who does the pre-sorting? Who removes zippers, buttons, rivets, and labels? Who pays for these processes? Under the current global management chain of textile waste, there is no standard answer to these questions. The contents of old clothes collection bins are diverse—100% cotton T-shirts, polyester track pants, blended shirts, and even non-textile items like faux leather bags and plastic slippers. Without a whole pre-treatment system that can sort out the "feedstock that Green Machine can eat," this machine can only operate efficiently in PowerPoint presentations.

This is the truth hidden behind the technology halo: the bottleneck for Green Machine's scaling is not its own technical problem, but a systemic problem of the entire textile waste management system. It is like a stomach with excellent digestive function, but it cannot get enough pre-treated standardized food.

2. The Feedstock Problem Is Not Because Sorting Technology Is Not Good Enough—It's Because Products Were Never Designed to Be Recycled at the Design Stage

Regarding why the feedstock supply is insufficient, the common explanations are "high sorting costs" and "incomplete collection systems." These are both correct, but not deep enough. The real issue is: a large number of textiles that enter the consumer market already contain at least one element at the design stage that crashes the recycling system.

Take denim as an example. The "Jeans Redesign Guidelines" sets a seemingly technically neutral standard for "designed for redesign" denim products: the total fabric composition must have at least 98% cellulosic fibers by weight. That means, if a pair of jeans is to enter the chemical recycling pipeline, the non-cellulosic components—elastane (usually spandex), polyester sewing threads, nylon labels, polyester pocketing fabric—must not exceed 2% in total.

Once this line is drawn, it ceases to be a mere technical suggestion. It becomes a market access threshold. A pair of skinny jeans containing 5% elastane—one of the best-selling styles in fast fashion—is excluded from the "recyclable" label from the design sketch stage. It's not that the quality is bad; it's that the design path itself has shut down the recycling option.

Now look at metal rivets. Section 5.2.f of the "Jeans Redesign Guidelines" optional requirements is quite blunt: it is recommended not to use metal rivets. The reason is that recyclers face two challenges when removing rivets—either spend a lot of labor prying them out one by one, or directly cut off the fabric around the rivets. Both options consume the economic viability of recycling. However, in the field of garment design, rivets are not just functional components; they are part of brand identity. Removing rivets means abandoning a design language. For some denim brands that use rivets as a brand symbol, the cost of this requirement is not just a few cents for replacement, but a loss of brand equity.

Sewing threads are another more subtle issue. The vast majority of garment sewing threads worldwide are polyester threads—high strength, low price, good colorfastness. But from a recycling perspective, a pure polyester sewing thread on a 100% cotton pair of jeans means the entire garment is no longer "pure cotton." If you want to send this pair of pants into a cellulosic chemical recycling process (like the dissolution step of Lyocell), the polyester sewing thread becomes a contaminant. If you send it into a poly-cotton separation device like Green Machine, the seam area has an extra layer of fiber mixing. Belgian company Resortecs identified this pain point and developed heat-dissolvable sewing thread—when heated to a specific temperature during recycling, the thread automatically disconnects, allowing easy separation of garment components, with fabric loss of only about 10%, and disassembly speed five times faster than manual labor. But since its inception in 2017, this technology remains mainly in concept validation and small-batch pilot stages. Why? Because the cost of heat-dissolvable thread is several times higher than ordinary polyester thread, and the benefit of using it—improved recycling efficiency—occurs after the product's life cycle ends, and is not reflected in the selling price or profit of any current-season garment.

Who pays for "recyclability" at the design stage? The consumer who buys this pair of jeans will not—they pay for style and comfort. The brand will not—using heat-dissolvable thread does not improve product performance but increases cost, so the final selling price would have to go up, and the marketing department would be the first to object. The recycler will not—they only receive goods at the end of the chain and have no influence over upstream design decisions. The result is: everyone in the entire chain agrees that "recycling is important," but everyone has a reasonable excuse not to invest in recyclability outside their own segment.

This is the essence of the "connection failure." It is not a failure of technology to connect, but a failure of economics to connect—between design and recycling, there is no mechanism that translates "recyclability" into a value that someone is willing to pay for.

3. Sneaker Recycling Is an Extreme Version of the Whole Issue—It Demonstrates the Structural Deficiencies of the Entire Industry in One Category

If a pair of jeans containing elastane is "recycling-unfriendly," then a pair of sneakers is a "recycling nightmare." Fashion for Good's research on sneaker recycling reveals an extreme version of the problem: an ordinary pair of sneakers can contain up to 30 different materials—polyester upper, TPU hot-melt film, EVA midsole, rubber outsole, metal eyelets, nylon stitching, memory foam tongue, polyurethane glue—all permanently bonded together by adhesive and stitching, leaving no margin for disassembly.

The current state of sneaker recycling can be summarized as: after mechanical shredding, they can only be used as low-value sports court underlay fillers, or directly incinerated for energy recovery. Chemical recycling is theoretically feasible, but only if these materials can be separated—and that is precisely the hardest thing to do for a sneaker designed to be indestructible.

This exposes a universal law that goes beyond the sneaker category: the higher the degree of material mixing and the more permanent the bonding method, the lower the recycling value. And the people who determine the degree of material mixing and bonding methods—product designers and development engineers—have never had "recyclability" in their performance metrics. A designer's KPIs are appearance, cost, and time-to-market. A development engineer's KPIs are color reproduction, physical strength, and marketability. Recycling? That's something that happens two years after the product is sold, not in anyone's KPIs.

This law applies to sneakers, and also to a down jacket with a polyester lining, nylon zipper, and metal zipper pull, to a pair of jeans containing spandex, and to a jacket inner layer with a pure cotton face fabric and a PU membrane on the back. Every additional layer of material mixing adds another "non-recyclable" verdict. And the greater the design freedom brands have in these products, the more difficult the recycling system's operation becomes.

This is a tension in the textile circular economy that has not been openly discussed: the design freedom that brands want—blends, multi-material bonding, functional coatings—and the feedstock purity that the recycling system requires are fundamentally in opposition. To reconcile this contradiction, either brands sacrifice design freedom (currently nobody is willing), or recycling technology leaps to handle any material mix (currently not possible), or a system is introduced where brands that choose "difficult-to-recycle" designs pay for the subsequent recycling costs—this is exactly the logic of Extended Producer Responsibility (EPR) systems, and also the direction the EU is advancing, but global implementation is slow and standards vary.

4. The Data Gap Between Bangladesh and Norway Reveals the Silent Costs of Developing Countries

Shifting the perspective from technology and design to geography, another overlooked dimension emerges. Textile waste is not evenly distributed—its generation and treatment are highly imbalanced geographically.

Bangladesh is the world's second-largest garment exporter, producing large quantities of cotton T-shirts, shirts, and jeans for European and American markets. But in this production process, from spinning to cutting, waste is generated at every stage. Cotton itself has losses—comber waste, fly waste, cutting scraps—and there is no widely cited unified figure in the industry for these loss rates. But the directional judgment is clear: developing countries generate far more waste from textile production than from post-consumer waste, and most of this waste is not systematically recovered into textile-grade fibers but flows into low-value fillers, mop yarns, or even direct landfill.

At the same time, Norway's textile recycling system—though not the highest in the world in terms of recovery rate—represents a relatively high level of systematization in its classification sophistication and processing capacity. Old clothes collection bins in Norway and Nordic countries typically classify items into three levels: "re-wearable," "usable as industrial wipes," and "fiber-recyclable," with some systems capable of brand-lot-level traceability.

The comparison between Bangladesh and Norway is not to judge who is better or worse—these two countries are at two extremes of the textile value chain: one is a producer, the other is an end-of-life processor in a high-consumption market. This comparison reveals: the solution to the textile waste problem cannot be a one-size-fits-all global standard; it must be designed by region, by waste type, and by technology route. And currently, the global discussion on circular textiles is mainly driven by European and American brands and NGOs, and the standards they set—such as recycled content certifications, chemical safety lists—naturally tend to solve post-consumer waste problems, with insufficient attention to industrial waste generated during production. A spinning mill in Bangladesh generates daily amounts of waste yarn and comber waste; if there were an economically feasible recycling route, the environmental benefit would be no less than recycling tens of thousands of old T-shirts. But the global institutional design for circular textiles has not yet fully covered this linkage.

From this perspective, looking back at the 98% cellulosic fiber standard of the "Jeans Redesign Guidelines," its power logic becomes clearer: this line is jointly drawn by brands, recyclers, and academic institutions, influencing "which products can enter the high-end chemical recycling pipeline." But how much voice do developing country fabric manufacturers have in the process of drawing this line? For those small and medium-sized fabric mills whose core products are poly-cotton blends, after their products are excluded from the definition of "recyclable," what is their way out? Standard-setting is not a neutral technical act; it naturally divides winners and losers. And in circular economy standard-setting, current losers are mainly concentrated in the middle and low end of the industry chain, among producers whose products are primarily blends.

5. Turkey's Cross-Sector Collaboration Experiment: When the Government Is Willing to Be the 'Middleman Payer'

Is there any place trying to break this deadlock? Turkey offers a case worth unpacking.

Turkey is one of the world's important producers and consumers of recycled cotton. Its textile industry has a unique structure: it has a large amount of spinning and weaving capacity, a huge garment manufacturing industry, and a considerable number of post-consumer textile recyclers. This geographic concentration of "production-consumption-recycling" makes it easier to attempt closed-loop models than in a fragmented global supply chain.

In recent years, Turkey has seen multiple cross-sector cooperation projects for recycled cotton, involving textile mills, brands, recyclers, and local governments. A typical cooperation process goes like this: brand commits to purchasing a certain proportion of recycled cotton blended fabric → textile mill modifies spinning process to accommodate recycled cotton short fibers → recycler invests in sorting equipment after receiving stable purchase commitment → government provides tax incentives or subsidies to fill initial losses. The key role in the chain is the government—it does not just make calls or set visionary goals; it uses real money to fill the trust gap of "who will take the first step."

The core insight of this model is that the circular economy at its early marketization stage faces a classic "chicken-and-egg" dilemma. Recyclers don't invest in sorting equipment because they are uncertain about stable demand; textile mills don't modify processes because they are uncertain about stable supply of recycled cotton feedstock; brands don't place orders because they are uncertain about the quality and price of recycled cotton fabric. No segment is willing to bear the trial cost alone. The redefinition of the government's role—from regulator to "first payer"—is the most noteworthy part of the Turkish model for other countries to study.

But even in this model, the problem of "design for recycling" remains unsolved. The waste materials handled by Turkey's recycled cotton projects are mainly cutting scraps and spinning waste—these industrial wastes have known composition, are clean, and contain no metal accessories; they are the "lowest hanging fruit" in the recycling system. The real challenge—post-consumer poly-cotton blended textiles, denim with metal parts, multi-layer composite sportswear—still awaits a mechanism willing to pay for disassembly and sorting.

This also explains why Green Machine's current customers are concentrated in industrial waste and uniform recycling (ISS Group's old uniforms, Kahatex's production waste) rather than post-consumer textiles. Industrial waste has known composition, stable volume, and no unpredictable foreign objects—it bypasses all the difficulties of pre-sorting post-consumer textiles. Green Machine's commercialization is not a "failure," but it is currently staying within the boundaries where it can operate efficiently. To cross this boundary requires the entire industry to take a step forward—and that step is not a technology issue.

6. The Tone Set at the 2025 Textile Exchange Conference, and the Issues Yet to Be Placed on the Table

The core signal from the 2025 Textile Exchange Conference was clear: circular materials are no longer an "option"—they are being written into the industry's default rules. The weight of recycled polyester and recycled cotton usage in brand purchasing standards continues to rise, and certification thresholds for GRS (Global Recycled Standard) and RCS (Recycled Claim Standard) have shifted from "encouraged" to a "hard requirement" for many large brands. Carbon footprint accounting, once voluntary at the corporate level, is sliding toward mandatory labeling at the product level—meaning the carbon emissions of a T-shirt from fiber to finished product may, within the next five to ten years, be printed on the hangtag like a nutrition label on food.

What do these trends mean for the commercialization of Green Machine and similar technologies? In the short term, good news. The more rigid the brand demand for recycled fibers, the larger the market space for recycling technologies. Brands are driven by carbon emission targets and must find stable, traceable sources of recycled raw materials. Technologies like Green Machine that can provide closed-loop traceability "from specific waste to specific recycled fiber" have a narrative advantage over conventional "recycled PET bottles into recycled polyester"—because bottle-to-fiber is open-loop, while fabric-to-fabric is true circularity.

But long-term, the conference exposed an issue that has not yet been placed on the table: while the whole industry is rushing toward "using more recycled materials," who will ensure that the feedstock for these recycled materials—post-consumer textiles—can be continuously generated, collected, and sorted? A brand's commitment to replace 50% of its fabrics with eco-friendly recycled materials by 2030 (such as the public goal of Fast Retailing, parent company of Uniqlo) is one thing; ensuring that 50% of post-consumer textiles can actually enter the recycling pipeline by then is another. The former is a procurement commitment, the latter is a transformation of the entire social infrastructure—involving waste sorting policies, old clothes collection networks, construction of sorting centers, and R&D investment in automated disassembly. The scale of these investments far exceeds the capacity of any single brand or technology company.

The most likely evolution path is: the supply gap for recycled materials will become apparent in the next three to five years, prices will rise, and brands will start paying for "recyclability"—not necessarily directly charging consumers, but through green premiums in supply chain procurement contracts, or by participating in industry joint funds to subsidize recycling infrastructure construction. But this process will be slow, and will first occur in high-price, high-margin categories—outdoor gear, premium denim, brand collaborations—and only gradually trickle down to mass fast fashion.

7. Who Wins and Who Loses: Interest Redistribution Behind Circular Economy Standards

By this point, a clear line of interests can be drawn.

Those who are winning:

Companies with core chemical recycling technologies—the HKRITA/Green Machine alliance, Renewcell (though it has faced financial difficulties on its commercialization path, its technical direction has proven valuable), Worn Again Technologies—they possess the key capability of "how to handle the hardest-to-recycle blended textiles," and over the next five to ten years, the scarcity of this capability will translate into bargaining power.

Fabric manufacturers that have already laid out recycled fiber capacity—Taihua's PRUECO® OCEAN recycled nylon, Zhejiang Jiren's chemically recycled polyester—they have preemptively taken the supply position in the wave of brand purchasing standards shifting to recycled materials.

Brands capable of developing "design for recycling" products—those that proactively adopt the "Jeans Redesign Guidelines," partner with Resortecs to pilot dissolvable design, or build their own recycling closed loops—their narrative advantage on the consumer side and compliance cost advantage on the supply chain side will widen as recycling standards tighten.

Those who are losing or will soon lose:

Fast fashion brands that rely on diverse blends and complex accessory designs—when "at least 98% cellulosic fiber" becomes the access threshold for high-end recycling pipelines, a fast fashion dress containing 15% polyester is automatically classified as "non-recyclable." This is not survival of the fittest in fabric quality; it is the design path itself being excluded from the circular system. These brands must either abandon blend designs (affecting product appeal), pay for non-recyclability (increasing costs), or take a low-value recycling route (mechanical shredding for filler, brand narrative value reduced to zero).

Small and medium-sized fabric mills centered on poly-cotton blends—especially those in developing countries serving price-sensitive customers—their products naturally do not meet "high-purity" recycling standards, and they have neither the technical capability to switch to all-cotton or all-polyester product lines nor the financial strength to obtain recycled certifications. The discourse power of circular economy standards lies with brands and certification bodies; these fabric mills are the silent bearers.

Collectors and sorters of post-consumer textiles—this group consists mainly of informal workers globally (especially those in the second-hand clothing markets of South Asia and Africa). The tightening of circular economy standards and the demand of recycling technologies for feedstock purity may make their work even lower in value—previously, an old garment could still be exported to Africa as second-hand clothing; in the future, it may be directly labeled as "non-recyclable" and reduced to solid waste.

The real battlefield lies in standard-setting. Who defines "recyclable"? What test methods are used? Who is qualified to certify? The answers to these questions will determine the global flow and pricing of textile waste over the next decade. And this set of discourse power is currently heavily concentrated in Europe—the EU's Ecodesign for Sustainable Products Regulation (ESPR), Extended Producer Responsibility (EPR) systems, and certification systems such as OEKO-TEX and bluesign together construct a circular standard benchmarked on European values and technological levels. For textile practitioners in Asia and Africa, they are more often adapting to these standards than participating in their creation.

8. Back to That Rivet: The True Milestone of the Circular Economy Is Not in the Laboratory

Let's return to the opening image. A metal rivet, fastened to the corner of a jeans pocket. It was chosen by the designer, perhaps because the design director decided this season needed a "tougher workwear feel." It costs a few cents on the cost sheet. It is seen by consumers as a symbol of attention to detail. It performs perfectly throughout the product's lifespan—no fading, no falling off, no cracking.

But when this pair of jeans is thrown into an old clothes collection bin, transported through a sorting line, and finally reaches a recycler, that rivet becomes a problem: it drags the "most valuable" upper part of the jeans—the fabric near the rivet area—into a landfill. This landfill cost is not reflected in the brand's profit statement, not on the consumer's receipt, and not even in the carbon footprint accounting of this pair of jeans. It is borne by the recycler, by the residents of the community where the landfill is located, and by the environment itself. This is what economics calls a "negative externality"—costs are transferred to third parties who did not participate in the transaction decision.

The birth of Green Machine solved the question of "whether technology can disassemble poly-cotton blends." It solved it well. But what it has not solved, and cannot solve alone, is: who can ensure that an old poly-cotton blended shirt, before entering Green Machine's reactor, has been washed, dried, stripped of all non-recyclable accessories, and fiber-composition-tested to confirm the blend ratio? The complexity and cost of this pre-treatment process can, in some cases, exceed the operating cost of Green Machine itself. And the investment in pre-treatment is currently not borne by any single link.

This is the full weight behind the statistic that "only 1% of non-reusable textiles are recycled into new textiles." It is not evidence of technological failure—quite the opposite; over the past decade, textile recycling technology has made breakthrough progress. It is evidence of systemic failure—the entire textile value chain, through the eight links of design, production, sales, consumption, disposal, collection, sorting, and recycling, has at least three points of disconnection. Each disconnection is a question of 'who pays,' and so far, there is no answer sheet accepted by the entire industry.

The real milestone of industrialization is not how many Green Machine units have been sold. It is: first, whether brands begin to incorporate requirements such as "dissolvable, single-material, no hardware" into product design specifications; second, whether old clothes collection bins and sorting centers have the ability to classify old garments by fiber composition (not just by wear level); third, whether governments set economic costs for "non-recyclable" design choices through EPR systems or green procurement policies. Only when these three things happen simultaneously can Green Machine truly receive enough "feedable material," and the gears of scaled operation truly mesh.

That day has not yet arrived. But it is approaching. Not because technology has broken through, but because the narrative space left for brands and governments is narrowing—when 'sustainability' shifts from a plus factor to a market access condition, those products that have locked their recycling fate at the design stage will eventually move from 'normal goods' to 'problematic goods.' The day a rivet turns from 'attention to detail' into 'design debt'—that is the real beginning of the circular economy.