新的處理技術可以回收棉花和聚酯纖維
一項新的化學回收技術已經開發出來，可以回收棉花和聚酯做成黏液纖維，並產出三種回收所製成的產品。這項技術是由Mistra Future Fashion所開發，經過六年的研究，被形容是一項“突破”，Blend Re：wind將棉花轉化為全新的高品質粘液纖維和聚酯成為兩種純淨的新素材。
該公司表示，這一個發展是全球紡織品回收系統未來發展的一個重要里程碑，為實現時尚和紡織品的循環利用提供了必要條件。
La Motte of Mistra Future Fashion與RISE研究科學家Hanna de la Motte博士說：「我們的獨立工序Blend Re：wind是以現有已開發的工業流程為基礎開發的，我們的目標是盡可能地整合，以最大限度地減少環境和經濟成本，同時促進產業發展。擴大實驗室規模是目前最大的挑戰，同時也是要付出龐大的代價。Blend Re：wind過程的整合盡可能將以可行的方式來應對這些挑戰」。
「目前全球正在進行多項卓越的環保再造創新，成功的未來環保回收系統非常有需要，很可能需要不同的流程，我們希望Blend Re：wind能在未來的全球市場中佔有一席之地」。
該計畫側重於聚酯/棉（聚棉）纖維混紡的化學方式回收，分離並產出聚酯單體和適合於再生纖維素纖維（例如粘液纖維）的棉花漿，以做為未來的產業使用。
Mistra表示，重點在棉花回收步驟，從分離的棉花殘留物生產出高品質的粘液纖維，據說這是進一步回收織物加工的關鍵。
所產出的纖維具有與現有粘液生產商用的，以溶解紙漿所製成的纖維具有相同的品質。分離出的聚酯殘餘物、聚酯單體，可以重新聚合成高品質的聚酯。這些單體適合與現有的化學工序相結合，Mistra說，它們已與相關廠商建立了夥伴關係，並進行了實驗。
該公司表示，這一處理過程的重大利益在於分離技術需要考慮現有的產業，目標是與現有的森林和化工產業或其他回收方案進行整合。這種分離方式使用了瑞典森林工業和粘液工業中已經使用的化學品，以促進可能的整合。
此外，該技術具有強大的環保性能，因為它是以水為基礎的，只使用普通的廉價且大宗化學品和催化劑。
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Sweden’s Blend Re:Wind Has a New Process for Recycling Cotton and Polyester
Blend Re:wind, a new process that recycles cotton and polyester, has been introduced in Sweden by Mistra Future Fashion.The process breakthrough came after six years of research in textile recycling and is an important milestone toward the future of global textile recycling systems necessary to enable circularity for fashion and textiles, said Hanna de la Motte, theme leader of Mistra Future Fashion and a research scientist at the Research Institutes of Sweden.
“Our separation process, Blend Re:wind, is developed having existing industrial processes in mind, and our aim is to integrate as much as possible to minimize both environmental and economic costs, while boosting businesses,” de la Motte said. “Scaling up from lab scale is the biggest challenge at the moment and it is also costly. The integration possibilities of the Blend Re:wind process would, however, address these challenges in feasible ways.”
Mistra Future Fashion is a research program on circular economy and serves for a future positive fashion industry.
She said there are various innovative recycling methods in progress globally at the moment that are “highly needed for successful future recycling systems. Different processes will most probably be needed and we hope that Blend Re:wind is one of these on the global market in the future.”
In Blend Re:wind, new viscose filaments from cotton are produced by a chemical recycling process of polyester and cotton fiber blends. The process generates three circular outgoing product streams. Cotton is turned into new high-quality viscose filaments and polyester into two pure new monomers.
Sigrid Barnekow, program director at Mistra Future, explained that the project focuses on chemical recycling of polyester and cotton fiber blends with the objective to separate and generate relevant outputs for future industrial use–polyester monomers and a cotton pulp suitable for regeneration into cellulosic textile fibers, like viscose.
The key focus is on the cotton recycling stream to produce high quality viscose filaments from the separated cotton residue, which is crucial for further industrial processing toward recycled fabrics, Barnekow noted.
So far, viscose filaments have successfully been obtained from cotton separated from worn-out polyester and cotton blend sheets. The filaments have the same quality as filaments made from commercial dissolving pulp used in existing viscose production.
The separated polyester residue known as monomers, can be re-polymerized into high quality polyester. A strong benefit with this process is that the separation takes existing industries into consideration, and the aim is integration with existing forest and chemical industries, or other recycling options. The separation uses chemicals already utilized in the Swedish forest industry, and in the viscose industry, to facilitate possible integrations.
Blend Re:wind was developed in the Swedish Mistra Future Fashion initiative by the Chalmers University of Technology, Research Institutes of Sweden and the international forest industry group Södra.
The project budget is 600,000 euros ($705,000), which has been funded in Mistra Future Fashion with funds from the Mistra Research Foundation, RISE Circle Economy Centre of Excellence, and in-kind contribution from involved partners.
Original Article: Sourcing Journal
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