Research libraryClosing the Loop
Chapter 07 of 14 · Part II · Draft web edition
Separating polyester-cotton and elastane blends chemically demands selective solvents, careful energy and residue control, and proven outlets, so mono-material cotton design is the first recycling investment.
The cloth is woven from this chapter's 4 exhibits: each weft is one exhibit's own data, normalised; each warp group is a section. The probe reads the exhibit's own value where it crosses. Procedural visualisation, not a measurement.
Read-out
Derived from Textile Exchange: virgin fossil-based synthetics 75/124 = 60.5 percent; cotton 24.4/124 = 19.7 percent; residual (124 - 75 - 24.4)/124 = 19.8 percent. Rounded to one decimal place. The residual is heterogeneous and is not a recycled-fibre measure.
Unit: percent of global fibre production, 2023. Status: derived. Sources: S0704.
Overture · 1 min
The answer is to prevent incompatible polymer mixtures at the design specification, then keep every unavoidable blend in a declared stream with a named receiving process. Chemical fractionation is a conditional destination, not permission to mix fibres. Polycotton requires a choice between attacking polyester or removing cellulose. Elastane adds a separate polyurethane problem even at low mass share. For GFT's Cameroon textile programme, the practical default is a cellulosic bill of materials, mechanical stretch where product trials permit it, and dedicated polycotton or elastane bales where customer performance requirements make a blend necessary. A recycler should approve that stream before production scales.
This sequence puts design before solvent selection. It also puts evidence before a circularity claim. The factory must know the composition of every fabric roll, thread, label, interlining and elastic component. It must preserve that identity through cutting, baling and sale. Where no receiver has accepted the resulting fraction, the honest route is controlled storage, a lower-grade application or disposal under local rules, not an assumed fibre-to-fibre loop.
7.1
Global fibre production reached 124 million tonnes in 2023. Virgin fossil-based synthetic fibres accounted for 75 million tonnes and cotton for 24.4 million tonnes. These are production volumes, not garment counts, and they do not show how much of each fibre entered any particular product category.[S0704] They nevertheless explain why cotton recycling cannot be designed as though cotton arrives alone. Polyester is present in the same fabric, the same seam or the same garment across many product specifications.
Exhibit 31 converts those cited tonnages into shares of the same total. The residual category contains every fibre outside virgin fossil-based synthetics and cotton. It must not be read as recycled fibre or as one material family.
The exhibit establishes scale, not recyclability. A small mass of a second polymer can decide the process route. Nor does a fibre label describe the whole garment. A cotton body can carry polyester thread, a polyester care label, synthetic interlining and an elastane-containing waistband. The recycling boundary must therefore be the complete product and its bill of materials, not the largest fabric panel.
Three architectures create different tasks. An intimate blend places two fibres within one yarn, as in polycotton. An interwoven or plated construction keeps distinct yarns but locks them into one textile. A panelled or layered garment joins different textiles in one product. The first requires chemical fractionation if both polymers are to be recovered at high quality. The second may still require dissolution or selective degradation. The third offers a mechanical disassembly opportunity only where seams, layers and components can actually be separated at reasonable cost. The University of Groningen sorting study uses related distinctions between mono-material, blended, interwoven, panelled and layered textiles.[S26]
This is why the familiar phrase "cotton-rich" is not a process specification. It gives no threshold for the receiving recycler and says nothing about elastane, finishes or trims. The useful record states each declared constituent, its mass share, its location in the garment, its colour and finish, and the tests used to verify the declaration. Unknown components are treated as exceptions until laboratory or supplier evidence resolves them.
The functional reason for blending also matters. Polyester can contribute dimensional stability and durability, while cotton contributes moisture absorption and comfort. Elastane contributes stretch and shape retention. The VTT review identifies these combined properties as a reason for the widespread use of polyester-cotton blends, while also identifying their chemical dissimilarity as the central recycling difficulty.[S35] Design for recycling does not deny the performance requirement. It asks whether knit geometry, yarn selection, garment fit or a removable component can meet that requirement with fewer permanent material bonds.
7.2
Verified polycotton feedstock
Verified polycotton feedstock. Starting point. Leads to Sort, shred and pre-treat. · sourced
Polycotton chemistry offers two principal strategies.
Sort, shred and pre-treat
Sort, shred and pre-treat. From Verified polycotton feedstock. Leads to Remove or depolymerise PES (Polyester route), Dissolve or degrade cellulose (Cellulose route). · sourced
Remove or depolymerise PES
Remove or depolymerise PES. From Sort, shred and pre-treat (Polyester route). Leads to Cotton fibres or dissolving pulp, PES monomers or intermediates. · sourced
Cotton fibres or dissolving pulp
Cotton fibres or dissolving pulp. From Remove or depolymerise PES. End point. · sourced
PES monomers or intermediates
PES monomers or intermediates. From Remove or depolymerise PES. End point. · sourced
Solid PES fraction
Solid PES fraction. From Dissolve or degrade cellulose. End point. · sourced
Cellulose dope or sugars
Cellulose dope or sugars. From Dissolve or degrade cellulose. End point. · sourced
The method behind it: Method.
Simplified technical taxonomy from the VTT and MDPI review. Actual outputs depend on composition, dyes, finishes, reaction conditions and purification. This is not a GFT operating line or a claim of commercial availability in Cameroon.
Unit: . Status: sourced. Sources: S35.
7.2 · the bodyExhibit 32 above; its figures are illustrative where marked.
Polycotton chemistry offers two principal strategies. The first removes or depolymerises polyester and retains cotton. The second dissolves or degrades cellulose and retains polyester. Within those branches, hydrolysis, glycolysis, methanolysis and aminolysis attack polyester in different ways. NMMO, ionic liquids, deep eutectic solvents and cold alkaline systems can dissolve cellulose. Acid or enzymatic hydrolysis can instead convert cellulose towards sugars, which sacrifices the cellulosic polymer chain as a textile fibre precursor. The 2026 VTT review sets out this taxonomy and compares the resulting fraction quality, reaction conditions and scale readiness.[S35]
Exhibit 32 simplifies that taxonomy into the decision a feedstock owner must make. It does not imply that every route is commercially available or that both outputs always reach fibre quality.
The polyester-removal branch is attractive when the surviving cotton can remain a fibre or become suitable dissolving pulp. Alkaline hydrolysis converts polyester towards terephthalate and ethylene glycol while cotton is filtered as a solid. Glycolysis targets bis(2-hydroxyethyl) terephthalate, while methanolysis targets dimethyl terephthalate and ethylene glycol. These are not interchangeable recipes. They differ in temperature, pressure, catalyst, purification burden and effect on the surviving cellulose.[S35]
The cellulose-removal branch is attractive when a clean solid polyester fraction can be filtered, washed and re-extruded, or when the dissolved cellulose has a demonstrated spinning outlet. NMMO is established in lyocell production, but its use in a blend still requires control of metals, finishes, viscosity and polyester separation. Ionic liquid and deep eutectic systems show laboratory potential, yet solvent recovery, solution viscosity and recovered polymer quality remain process-design questions. A cellulose hydrolysis route to glucose belongs to a fermentation or chemical platform, not automatically to fibre-to-fibre textiles.[S35]
Pre-treatment sits before both branches and can decide their economics. Dyes, finishing agents, metals and surface contamination can hinder solvent penetration, interfere with catalysts or destabilise the polymer. Shredding increases access for the reagent but does not remove those substances. The VTT review therefore treats pre-treatment as essential rather than optional for chemical polycotton recycling.[S35] A factory that records finish chemistry at fabric receipt gives the future recycler more useful evidence than a factory that records only "polycotton".
The correct output specification comes before reagent selection. A recycler buying solid cotton will test contamination and fibre or pulp quality. A recycler buying polyester monomer will test purity and the effects of dyes and catalysts. A recycler buying polyester solids will care about degradation, residual cellulose and melt-processing behaviour. A claim that "both fractions are recyclable" is incomplete until each fraction has its own measured quality and an actual destination.
For a Cameroon garment venture, the near-term task is consequently feedstock stewardship rather than reactor ownership. Keep polycotton lays and their clips separate by declared ratio, shade and finish. Obtain a receiver's trial protocol before accumulating a large bale stock. Test representative material through that receiver, then compare delivered feedstock cost and accepted yield with a lower-grade but proven local outlet. This keeps a chemical option open without converting an emerging laboratory route into an unsupported investment assumption.
7.3
Exhibit 337 paragraphs step it
Read-out
Illustrative GFT screening based on the review's discussion of fraction purity, cellulose DP or hornification, energy demand and industrial demonstration. Scores are ordinal judgements, not measured efficiencies or technology readiness levels. Scale evidence scores the concern created by limited demonstration, so higher is worse on every axis.
Unit: illustrative concern score, 1 low to 3 high. Status: illustrative. Sources: S35. Illustrative figures are teaching examples, not measured factory results.
A high separation yield can still produce two low-value outputs. The first fraction may carry enough of the second polymer to obstruct its next process. The second may be chemically recovered but too degraded for its intended application. VTT's review identifies incomplete fraction purity, cellulose degree-of-polymerisation damage, limited recovery of high-quality polyester intermediates, high chemical consumption and insufficient industrial-scale demonstration as recurring barriers across polycotton routes.[S35] These are separate acceptance tests. One mass-balance number cannot summarise them.
Cellulose damage requires particular care. Alkaline conditions that remove polyester can reduce cellulose degree of polymerisation, while high-temperature glycolysis, methanolysis or solvent treatments can cause hornification and reduce subsequent dissolution reactivity. The effects depend on the actual chemistry and conditions, so a route name alone does not determine damage. The review reports, for example, intrinsic-viscosity loss in one polyester-viscose alkaline system and discusses milder enzymatic and solvent alternatives.[S35] The factory should therefore require measurements on its own recovered cotton, not infer spinnability from a photograph of clean-looking fibres.
Exhibit 33 turns the review's recurring barriers into an illustrative screening model. Scores run from one for lower concern to three for higher concern. They are GFT's ordinal synthesis for comparing due-diligence questions, not experimental values and not a universal ranking of technologies.
The scores should not be averaged into a winner. A receiver with no tolerance for cellulose damage may reject a route regardless of its energy score. A monomer buyer may make purity the binding gate. A factory without solvent-recovery capability should treat that absence as a stop condition. The exhibit's purpose is to force separate evidence for each penalty before a process is shortlisted.
Feedstock logistics create another scale penalty. In UNIDO's Moroccan denim pilot, approximately 160 tonnes of cotton waste was gathered and sorted over four months, but the project reported high post-collection segregation costs and transport equal to 30 to 40 percent of total textile-waste recycling cost. The response included training garment makers in in-factory segregation.[S24] This evidence does not price a Cameroon plant. It does show why mixing at source can consume the margin that a later chemical recovery step is meant to protect.
A credible scale test therefore starts with a campaign of declared industrial material, not a small beaker of ideal fabric. It varies colour, finish, blend ratio and elastane presence across the actual supply. It measures reagent make-up, water and energy per accepted kilogram, solvent recovery, residue treatment, fraction quality and equipment downtime. It also repeats the trial long enough to expose fouling and variable feedstock. The review's call for more industrial-scale demonstration is a reason to demand this evidence, not a reason to assume it.[S35]
For an early-stage Cameroon cluster, this argues against treating polycotton fractionation as the default destination for every uniform or workwear clip. The first option is to prevent the blend where the use case permits. The second is to contract a proven external receiver for a defined bale. A local chemical reactor becomes a discussion only after sustained feedstock volume, receiver quality data, utility balances, residue permits and product offtake exist together.
7.4
Related · chapter 048 paragraphs step it
Read-out
Sourced from University of Groningen (April 2026) evaluation of 181 certified textile samples across 900 to 1,700 nm (S26). Multi-class composition uses Weighted KNN; binary elastane detection uses a 1D Convolutional Neural Network (1D-CNN).
Unit: percent. Status: sourced. Sources: S26.
Read this exhibit in its chapter ↗Elastane is a segmented polyurethane whose soft and hard domains provide elastic recovery and chemical resilience. That architecture is useful in wear but troublesome in recycling. Low elastane content can reduce shredding efficiency, promote clogging and diminish the quality and spinnability of recovered fibres. Conventional removal approaches include thermal or enzymatic treatment and solvents such as dimethylformamide, dimethylacetamide and tetrahydrofuran, which bring toxicity and regulatory constraints.[S0701]
The Groningen sorting research describes disruption at elastane levels of 2 to 5 percent, including jammed shredders, clogged filters and contaminated output. Its experiments also show why detection cannot be reduced to reading a dominant fibre label: a sample described as 94 percent cotton and 6 percent elastane can enter a cotton composition class while still requiring a separate elastane-positive label.[S26] Composition classification and elastane screening are therefore two different controls.
Near-infrared screening helps, but it is not a purity certificate. In that study of 181 certified samples measured across 900 to 1,700 nanometres, the best overall composition classifier reached 91.7 percent accuracy. The binary elastane model reached 92.6 percent overall accuracy, with 83.3 percent accuracy on elastane-present samples and 95.2 percent on elastane-absent samples. The author presents the work as a proof of concept requiring further validation on worn and contaminated textiles.[S26] A recycler should use the result to design quarantine and secondary checks, not to waive them.
Selective removal is chemically possible, but recent laboratory evidence also shows the distance to a plant decision. In a 2025 study, dimethyl sulfoxide alone produced partial elastane mass loss under the tested conditions, while adding 0.1 percent by volume DBN enabled near-complete or complete mass loss across the reported temperature and time matrix. Tests used pre-consumer fabrics containing 94 percent cotton and 6 percent elastane, and 87 percent polyester and 13 percent elastane. The authors observed dimensional relaxation and largely preserved matrix-fibre morphology and tensile strength.[S0701]
Those results do not establish an operating process. The same paper states that solvent and catalyst recovery were not experimentally addressed, and it calls for assessment of recovery efficiency, DBN stability, life-cycle effects and closed-loop management. It also warns that DMSO thermal decomposition can become hazardous in the presence of strong acids or bases, including DBN.[S0701] A lower-temperature laboratory treatment can still require specialised calorimetry, ventilation, process interlocks and solvent-recovery design before scale-up.
Earlier work on cotton-elastane dissolution reinforces the need to name the intended output. In experiments on shirts containing 95 percent cotton and 5 percent elastane, elastane remained intact in a sodium hydroxide and urea system and interrupted the regenerated cellulose film structure. Lithium chloride and dimethylacetamide dissolved both polymers into a composite film.[S0703] Producing a composite packaging film is not the same as recovering clean cellulose for textile spinning. The target product determines whether retained or dissolved elastane represents a route, a contaminant or a different product altogether.
The operational response is to isolate elastane before it enters a pure-cotton balance. Rolls carrying stretch fabric receive distinct codes. Their markers, roll ends, clips, rejected panels and sewing-room trimmings inherit that code. Bales state the declared elastane share and the evidence behind it. Where composition is uncertain, the bale remains in quarantine until a validated test resolves it. This avoids allowing a small, visually invisible component to invalidate a much larger cellulosic stream.
Interlude · the cloth half-woven
Woven: sections 7.0 to 7.4Still to weave: 7.5 to 7.7
Read-out
Annual fibre production is a supply measure. Landfill or burning and clothing-to-clothing recycling are end-of-life measures. The value-loss estimate also includes clothing underutilisation. No tonnage conversion or common denominator is inferred.
Unit: reported global measures, with source dates retained. Status: sourced. Sources: S02, S08, S09.
Read this exhibit in its chapter ↗7.5
The least burdensome separation step is the one never specified. The German Environment Agency's 2026 ecodesign study prioritises mono-materials because they are easier to sort and recycle across recycling methods. It also recommends that threads, labels and accessories use the same material as the main textile or be easy to remove, without compromising durability.[S0702] This is a whole-product rule. Changing the body fabric to cotton while leaving a mixed seam and trim package does not complete the task.
A cellulosic specification starts with the main fabric and sewing thread, then moves through interlining, labels, prints, buttons, elastic components and finishes. Each item receives one of three instructions: make it compatible with the cellulosic route, make it removable before shredding, or justify it as a declared exception with a separate recovery route. Directly printed care information can replace a sewn synthetic label where product rules permit. A non-textile button may be acceptable only when the receiver confirms that removal is practical. The decision is empirical, not a claim that every natural-looking component is process-compatible.
Exhibit 34 applies this logic to a shirt. It is an illustrative design model, not a certified product or a statement that GFT has already manufactured the specification.
Read-out
| Main fabric | Polycotton | 100 percent cotton where fit permits | Fibre and finish declaration |
|---|---|---|---|
| Sewing thread | Polyester core thread | Qualified cellulosic thread | Seam strength and recycling trial |
| Interlining | Fused synthetic | Cellulosic or removable option | Bond and disassembly test |
| Care information | Polyester satin label | Compliant direct print | Print durability and chemical review |
| Buttons | Fixed polyester | Removable non-textile option | Receiver-approved removal step |
| Stretch system | Elastane yarn | Mechanical knit or pattern ease | Fit, recovery and wash testing |
Illustrative cellulosic design model applying UBA's mono-material, compatible-component and removability principles. Every substitution requires product-performance and receiver verification. It is not a certified garment, a GFT production result or an assurance that natural materials are accepted by every recycler.
Unit: . Status: illustrative. Sources: S0702. Illustrative figures are teaching examples, not measured factory results.
The release-evidence column is as important as the substitution. Cotton thread that fails at the seam would shorten garment life and could create more waste than it avoids. A direct print that cracks or introduces an unacceptable chemical would fail a different circularity gate. Mechanical stretch that loses shape after washing would not satisfy the wearer. The UBA study explicitly warns that material substitution should not compromise durability.[S0702] Design review must therefore combine recyclability with fit, seam performance, colourfastness, abrasion, dimensional stability and care testing.
This also changes the role of the technical specification. A conventional tech pack states what the garment is. A circular tech pack additionally states what each component becomes at end of life. It identifies the intended recycling family, removal instructions, restricted substitutions and the evidence required before a supplier change. A purchasing team cannot quietly replace cotton thread with polyester thread on price without reopening the recovery decision.
Supplier contracts need the same discipline. Composition tolerances, finish declarations and change-notification duties belong in the fabric and trim purchase specification. Incoming quality control samples against those declarations and escalates discrepancies before spreading. A missed trim substitution can affect every later offcut from that style. Early detection costs one roll review. Late detection can compromise a production campaign's bales.
7.6
Mono-material does not mean shapeless. Knit loops can provide stretch through structure, while pattern ease, rib geometry and yarn selection can provide fit and recovery without elastane in suitable products. The Groningen study notes that knitted structures can stretch without elastane, and the UBA work treats product-specific requirements and trade-offs as central to ecodesign rather than imposing one construction on every garment.[S26][S0702] The design team still has to prove recovery, comfort and durability on the intended style.
A useful product review asks where stretch is actually needed. A neck rib, cuff, fitted waist or close-fitting body panel may have different requirements. One area may be solved through knit structure, another through garment ease, and a third through a removable elastic component. This zoned review is more precise than a binary choice between a fully elastane-free garment and a fully blended one. It also creates disassembly options when only one component carries the incompatible material.
Institutional uniforms require a separate decision. Buyers may specify polycotton for durability, dimensional stability or industrial laundering. A designer should test whether a cotton construction meets the actual laundering and abrasion protocol before requesting a specification change. If the buyer retains polycotton, the factory should not relabel the resulting clips as cotton. It should maintain a dedicated polycotton stream with declared ratio and finish, then contract the receiver and route before bulk production. UNIDO's Moroccan work on in-factory segregation and high post-collection sorting cost supports this early separation discipline.[S24]
The worked example shows why prevention deserves attention before fractionation. It does not prove that cotton is always the better environmental or commercial choice. A longer-lasting polycotton uniform could outperform a short-lived cotton alternative under a different functional unit. The comparison must therefore include service life, laundering, repair, replacement rate and actual end-of-life route. Material purity is one design variable, not a complete sustainability assessment.
Change control completes the product strategy. Generative design tools can propose silhouettes, fabric constructions and specifications, but research on multi-model garment pipelines does not itself establish recyclability compliance.[R31] GFT's recommended rule layer sits after generation and before approval: check every proposed component against the permitted materials library, flag an incompatible combination, and require a named process route for exceptions. Human design, quality and production owners remain responsible for the release decision.
7.7
Read-out · illustrative
Recommended dashboard design, not operating results or targets. Each measure requires a period, boundary and owner; unavailable denominators remain unavailable.
Unit: illustrative measure definitions. Status: illustrative. Illustrative figures are teaching examples, not measured factory results.
Read this exhibit in chapter 12 ↗Design discipline has commercial value before any eco-modulated fee is calculated. It reduces the number of waste identities the factory must manage, preserves more clips in a single process family and gives buyers clearer composition evidence. It also makes supplier review easier: a short list of approved cellulosic components is simpler to audit than a changing mixture of fibres, finishes and trims. These operational benefits do not require an unsupported claim about regulatory eligibility.
France's Refashion system illustrates why the claim must remain specific. Its 2026 framework includes bonuses for durability, environmental certification and incorporation of recycled raw materials, alongside recyclability penalties. A product subject to a penalty is not eligible for a bonus. The published penalty criteria concern metalloplastic fibres or wires and electrical or electronic components, subject to the stated traceability-device exclusions.[S22][S23] Elastane is a recycling concern, but the sources opened here do not support calling it a standalone Refashion penalty criterion.
The recycled-material bonus has another important boundary. Refashion's 2026 guide states that material from production offcuts is not eligible for that bonus, and it also excludes material from unsold items. The guide sets collection or funding, facility and proximity conditions for eligible waste routes.[S23] A Cameroon manufacturer must therefore not promise that incorporating its own pre-consumer clips will automatically generate this French bonus. That claim would confuse a general recycled-content argument with one scheme's detailed eligibility rules.
Mono-material design is not itself listed as an automatic Refashion bonus in the cited framework. It can support recyclability and feedstock quality, while durability or recognised certification requires its own evidence. This distinction protects the design team from selling a fee benefit before the marketer, product reference and scheme year have been checked. It also keeps regulatory analysis separate from process engineering. The operational reading here is not legal advice, and current scheme documents should govern any actual declaration.
Recycled-content certification adds a separate chain-of-custody task. The TraceWeave implementation guide describes facility Scope Certificates, Transaction Certificates at changes of ownership and mass-balance records where virgin and recycled inputs share a process. It also warns that internally generated regrind or scrap capable of reuse in the same process should not simply be presented as certified pre-consumer input.[S28] The practical lesson is that a waste code and a recycled claim are not interchangeable. Certification scope and definitions must be confirmed with the relevant certification body.
A useful digital record follows the material rather than the marketing statement. At fabric receipt, it holds supplier composition, finish and change-control evidence. At cutting, it links the roll and lay to the resulting clip container. At baling, it records mass, shade, declared blend, elastane status, exceptions and receiving destination. At dispatch, it links the bale to the transaction and any required certificate. At the recycler, it requests accepted mass, rejection reason and output route. This chain lets the factory reconcile what was designed, cut, recovered and claimed.
The same record supports a measured exception policy. A style containing elastane should not disappear inside an average cotton percentage. A polycotton uniform order should not borrow the recovery performance of a cellulosic T-shirt line. A rejected bale should change the next design or sourcing decision, not merely the waste report. Production, design and quality teams should review these exceptions together because the cause may sit in a tech pack, a supplier substitution or a cutting-room practice.
The investment sequence follows from the evidence. First, establish composition and component control. Second, qualify cellulosic designs through wear and process trials. Third, segregate unavoidable blends and secure receiver acceptance. Fourth, evaluate chemical fractionation only with measured two-output quality, utility use, solvent recovery, residues and offtake. Skipping to the fourth step leaves the factory with sophisticated chemistry applied to an avoidable design problem.
Circularity under the Warp and Signal approach is consequently a specification discipline before it is a recycling technology. Production carries the material identity. Measurement preserves it. The recovery route succeeds only when both remain attached to the same physical batch. Where the evidence ends, the claim ends as well.
Check the record
Every knot is a source this chapter cites; select one to read its record, or filter the register by grade. Publication dates and inherited-source limits stay explicit. Read the paper's full evidence summary.
11 sources · 38 citation marks on this pageMost cited: S35, 9 times
Grade AGrade BGrade CKnot size: citations on this page
All 11 records shown
R31 · Grade C · inherited record
Inherited evidence R31
By 2025-2026 the field moved to multi-model garment-design pipelines (fabric construction, shade, weave, silhouette) and physics-constrained generation coupling neural generation with simulation validation.
Publication date unrecorded. Inherited source-text record. The original publication has not been independently reopened for this web edition.
c07-S0701 · Grade B
Selective Elastane Removal Using DMSO-DBN Under Moderate Temperatures: From Pure Filaments to Cotton/Polyester Blends
DMSO alone promoted only partial elastane mass loss, typically 26, 32% at 80, 100 °C (60 min) and up to 79% at 120 °C (10 min), whereas the addition of 0.1% v/v DBN enabled near-complete or complete mass loss (81, 100%) across 80, 120 °C within 10, 60 min.
2025-12-06. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c07-S0702 · Grade A
Ecodesign for Sustainable Products Regulation: requirements for the ecodesign of textiles and the possible transfer to an ecodesign label
Design garments using a single fibre type. Mono-materials are significantly easier to sort and recycle relating to all types of recycling methods. Use threads, labels, and accessories made from the same material as the main textile or ensure they can be easily removed.
2026-02. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c07-S0703 · Grade B
Recycling of Waste Cotton Textile Containing Elastane Fibers through Dissolution and Regeneration
The elastane fibers were partially hydrolyzed in H2SO4 solvent and reduced the transparency of regenerated films, but they were well retained in NaOH/urea solvent and interrupted the structure of regenerated cellulose films.
2022-03-24. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c07-S0704 · Grade B
Materials Market Report 2024
The production of virgin fossil-based synthetic fibers increased from 67 million tonnes in 2022 to 75 million tonnes in 2023.
2024-09-26. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c07-S22 · Grade A
Eco-Modulation: A Driver for Sustainable Fashion
In 2026, bonuses reward the products that are most virtuous in terms of eco-design, and penalties apply to products that contain certain components which make recycling hazardous.
2026-01. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c07-S23 · Grade A
Ecomodulations Guide 2026
If the recycled material incorporated comes from production off-cuts;
2026-01-27. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c07-S24 · Grade A
Circular textile value chains: Advancing local manufacturing of yarns and fabrics with recycled content in Morocco
Apart from the collection,this experience offered valuable insight into waste management organization and the associated costs.Post-collection segregation involves high costs,and the transportation cost can comprise 30-40%of the total cost of recycling textile waste.
2023-11. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c07-S26 · Grade B
Machine Learning-Based Identification of Textile Composition from NIR Spectroscopy for Automated Sorting
The best composition classification model, based on Weighted KNN, achieved an accuracy of 91.7%, showing that common mono-materials and blends can be distinguished reliably. The elastane detection model achieved an overall accuracy of 92.6%, with class-specific accuracies of 83.3% for elastanepresent samples and 95.2% for elastane-absent samples.
2026-04-22. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c07-S28 · Grade C
GRS/RCS chain of custody + Tier 2-3 mass balance in textile PLM
The Global Recycled Standard (GRS v4) and the Recycled Claim Standard (RCS v4) require a Scope Certificate per production facility, a Transaction Certificate for each change of ownership of the material and an algorithmic mass balance when the Tier 3 chemical reactor simultaneously introduces virgin and recycled raw material.
2026-07-27. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗c07-S35 · Grade B
Recent Advances in Recycling Polyester-Cotton Blended Textiles: Review
The review finds that chemical depolymerisation of PES and selective dissolution of cellulose currently show the strongest potential for high-quality fibre-to-fibre recycling, particularly when solvent recovery systems are integrated. However, significant barriers remain, including incomplete fraction purity, degradation of cellulose DP, limited recovery of high-quality polyester intermediates, high chemical consumption, and insufficient industrial-scale demonstrations.
2026-07-31. Register access date: 2026-10-30. Source provenance is supplied by the paper evidence register.
Open the recorded source ↗S0704 Textile Exchange. 2024-09-26.
S26 University of Groningen. 2026-04-22.
S35 VTT Technical Research Centre of Finland and MDPI Textiles. 2026-07-31.
S24 United Nations Industrial Development Organization (UNIDO). 2023-11.
S0701 Polymers (MDPI). 2025-12-06.
S0703 Membranes (MDPI). 2022-03-24.
S0702 German Environment Agency (Umweltbundesamt). 2026-02.
R31 arXiv 2509.04705. Publication date unrecorded; inherited source-text check.
S22 Refashion. 2026-01.
S23 Refashion. 2026-01-27.
S28 TraceWeave. 2026-07-27.
Keep the thread · chapter 07 of 14
Move the shuttle along the rack to preview any chapter: its sections, exhibits and reading time. Draft web edition. This research is not investment, legal or tax advice; illustrative models are not measured factory results.
The paper's rack · 14 boltsBolt length: reading time
01The linear trap and the pre-consumer advantage
A cotton economy gains its most recoverable textile feedstock before a garment reaches a consumer. The practical starting point is an identified, weighed and segregated factory offcut, not an anonymous bale of mixed municipal clothing.
02Part I: The Linear Trap and the Pre-Consumer Advantage
Before cloth is woven, seed cotton and lint have already generated cottonseed, linters, motes, stalks and comber noils. Their value depends on measured recovery, not on the harvest total alone.
03Part I: The Linear Trap and the Pre-Consumer Advantage
Fabric is the largest garment cost and the factory's cleanest potential secondary material. The saving comes from separating marker geometry, table execution and quality failure, then weighing each stream.
04Part II: Engineering the Recycling Routes
Mixed textile waste is nearly worthless because different polymers require incompatible recycling chemistries, making cutting-table segregation and near-infrared spectral classification the gatekeepers of circular value.
05Part II: Engineering the Recycling Routes
Mechanical tearing and garnetting require a fraction of the capital, water and energy of chemical plants, but fibre shortening limits pure recycled yarn counts unless blended with long-staple virgin cotton.
06Part II: Engineering the Recycling Routes
When cotton fibres are too short for mechanical spinning, chemical recycling dissolves cellulose chains into high-purity pulp for viscose and lyocell filaments, provided degree of polymerisation and solvent recovery are tightly controlled.
07Part II: Engineering the Recycling Routes
Separating polyester-cotton and elastane blends chemically demands selective solvents, careful energy and residue control, and proven outlets, so mono-material cotton design is the first recycling investment.
08Part III: Post-Consumer Flows, Trade Asymmetries and Producer Responsibility
European used-textile exports have nearly tripled since 2000 to around 1.4 to 1.7 million tonnes a year, shipping unrecyclable fast-fashion blends to African ports without transferring Extended Producer Responsibility funds.[^S11][^S13]
09Part III: Post-Consumer Flows, Trade Asymmetries and Producer Responsibility
Separate textile collection has been mandatory since January 2025, the revised Waste Framework Directive has been in force since October 2025, and Member States must establish textile EPR schemes by April 2028. Eco-modulated fees turn garment durability, recyclability and evidence into direct financial variables.[^S04][^S12][^S0901]
10Part III: Post-Consumer Flows, Trade Asymmetries and Producer Responsibility
Regulation (EU) 2024/1781 bans the destruction of unsold apparel and mandates public disclosure of discarded stock, making machine-learning demand forecasting and computer-vision quality control the primary defences against overproduction waste.[^S03][^R27][^R29]
11Part III: Post-Consumer Flows, Trade Asymmetries and Producer Responsibility
A recycled-content claim is only as strong as the material identity, custody documents, process-loss arithmetic and claim approval behind it. Certificates support that evidence; they do not replace it.
12Operationalising the circular factory
Weigh material where it changes hands, preserve its identity, and make each unresolved difference a management decision. Circularity then becomes an operating discipline with inspectable limits.
13Part IV: Operationalising the Circular Factory
By partnering a lean cut-make-trim garment factory with Cameroon's emerging integrated spinning poles at Dibamba and Garoua, pre-consumer cotton clips cycle back into local yarn without greenfield spinning capex.
14Part IV: Operationalising the Circular Factory
Rather than betting greenfield capital on unproven chemical reactors, a disciplined four-phase illustrative roadmap embeds cutting-table sorting and mass-balance measurement in Phase 1, scales regional mechanical blending in Phase 2, and gates advanced regeneration to Phase 3.[^S28]