BR102021014992B1 - RECYCLING PROCESS OF TEXTILE RETAILS CONTAINING POLYAMIDE AND ELASTANE USING VEGETABLE OILS - Google Patents

RECYCLING PROCESS OF TEXTILE RETAILS CONTAINING POLYAMIDE AND ELASTANE USING VEGETABLE OILS Download PDF

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BR102021014992B1
BR102021014992B1 BR102021014992-2A BR102021014992A BR102021014992B1 BR 102021014992 B1 BR102021014992 B1 BR 102021014992B1 BR 102021014992 A BR102021014992 A BR 102021014992A BR 102021014992 B1 BR102021014992 B1 BR 102021014992B1
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elastane
polyamide
textile
vegetable oils
recycling process
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BR102021014992-2A
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BR102021014992A2 (en
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Jonathan Baumi
Mauricio De Moraes
Helder Rodrigues Da Silva
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Jonathan Baumi
Mauricio de Moraes
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
    • B29B17/0036—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting of large particles, e.g. beads, granules, pellets, flakes, slices
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
    • C08J11/18—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material
    • C08J11/22—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
    • C08J11/18—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material
    • C08J11/22—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds
    • C08J11/24—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds containing hydroxyl groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0203—Separating plastics from plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0213—Specific separating techniques
    • B29B2017/0255—Specific separating techniques using different melting or softening temperatures of the materials to be separated
    • B29B2017/0258—Specific separating techniques using different melting or softening temperatures of the materials to be separated using heated surfaces for selective softening or melting of at least one plastic ingredient
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

PROCESSO DE RECICLAGEM DE RETALHOS TÊXTEIS CONTENDO POLIAMIDA E ELASTANO UTILIZANDO ÓLEOS VEGETAIS. A presente invenção refere-se a reciclagem de resíduos têxteis da indústria de confecção, compreendendo Poliamida, Elastano para se obter poliamida reciclada. O processo desenvolvido é ambiental amigável e se baseia na fusão do resíduo de material têxtil, pela ação de óleos vegetais (virgens ou de fritura) ou gorduras. Esse processo permitiu a viabilização de uma nova fonte de resina plástica a partir de retalhos de tecidos sintéticos, para a prática da economia circular na própria indústria têxtil como também fornecer matéria prima para outros setores produtivos que utilizam nylon (indústria automotiva e indústria de plásticos de engenharia) além de permitir a remoção do elastano, que se torno um contaminante, do nylon.RECYCLING PROCESS OF TEXTILE RETAILS CONTAINING POLYAMIDE AND ELASTANE USING VEGETABLE OILS. The present invention relates to the recycling of textile waste from the clothing industry, comprising Polyamide, Elastane to obtain recycled polyamide. The process developed is environmentally friendly and is based on the fusion of textile material residue, by the action of vegetable oils (virgin or frying) or fats. This process allowed the viability of a new source of plastic resin from scraps of synthetic fabrics, for the practice of the circular economy in the textile industry itself, as well as supplying raw material for other productive sectors that use nylon (automotive industry and plastics industry of engineering) in addition to allowing the removal of elastane, which becomes a contaminant, from nylon.

Description

Campo da invençãofield of invention

[001] A presente invenção refere-se ao processamento de resíduos têxteis da indústria de vestuário, compreendendo Poliamida (Nylon) com Elastano para obter poliamida reciclada, através de um processo ambientalmente amigável que se utiliza de fontes renováveis e biodegradáveis.[001] The present invention refers to the processing of textile waste from the clothing industry, comprising Polyamide (Nylon) with Elastane to obtain recycled polyamide, through an environmentally friendly process that uses renewable and biodegradable sources.

[002] A indústria Têxtil e de Confecção é o 2° ramo industrial que mais impacta o meio ambiente, sendo grande parte a geração de resíduos sólidos gerados provenientes dos processos produtivos do setor de confecções. Estima-se que o setor têxtil brasileiro gere anualmente 170 mil toneladas de retalhos de tecido e a maior parte se torna passivo ambiental em aterros, devido à dificuldade de reciclá-los, por motivos logísticos e custos operacionais e tecnológicos elevados. As fibras têxteis mais impactantes são as sintéticas, e entre as principais está a poliamida, também conhecida como Nylon, sendo mais comuns os Nylon 66 e o Nylon 6, resinas plásticas nobres de alto custo, não consideradas biodegradáveis podendo levar até 400 anos para se degradar completamente na natureza.[002] The Textile and Apparel industry is the 2nd industrial branch that most impacts the environment, with a large part of the generation of solid waste generated from the production processes of the apparel sector. It is estimated that the Brazilian textile sector annually generates 170 thousand tons of fabric scraps and most of it becomes environmental liabilities in landfills, due to the difficulty of recycling them, for logistical reasons and high operational and technological costs. The most impacting textile fibers are synthetic, and among the main ones is polyamide, also known as Nylon, with the most common being Nylon 66 and Nylon 6, high-cost noble plastic resins, not considered biodegradable and can take up to 400 years to develop. completely degrade in nature.

[003] Apesar das ações das empresas pelo melhor aproveitamento dos materiais utilizados durante tais processos produtivos, ainda pode ser considerado um grande desafio a diminuição desses resíduos devido as perdas intrínsecas aos processos de corte de tecidos. Além de desperdício de recursos para as empresas do setor, considerando que segundo dados da ABIT (2021), Associação Brasileira da Indústria Têxtil e de Confecção, o setor têxtil e de vestuário é um dos maiores setores industriais do Brasil, representando 16,4% dos empregos na Indústria de transformação e 5.7% de seu faturamento, com R$ 185,7 bilhões, compreendendo 3,5% do PIB total brasileiro.[003] Despite the companies' actions for the better use of the materials used during such production processes, the reduction of these residues can still be considered a great challenge due to the intrinsic losses of the fabric cutting processes. In addition to wasting resources for companies in the sector, considering that according to data from ABIT (2021), the Brazilian Textile and Apparel Industry Association, the textile and clothing sector is one of the largest industrial sectors in Brazil, representing 16.4% of jobs in the manufacturing industry and 5.7% of its revenue, with R$ 185.7 billion, comprising 3.5% of the total Brazilian GDP.

[004] Com uma produção média no setor de confecção de 9,04 bilhões de peças, representa o quarto maior parque produtivo de confecção do mundo. Assim, buscam-se soluções para o reaproveitamento dos resíduos por meio de novos processos com foco na sustentabilidade ambiental, de forma a incluir essa cadeia no conceito da economia circular, com matérias primas para produtos com alto valor agregado e expandindo a vida útil dos resíduos têxteis que seriam descartados.[004] With an average production in the clothing sector of 9.04 billion pieces, it represents the fourth largest clothing production park in the world. Thus, solutions are sought for the reuse of waste through new processes focused on environmental sustainability, in order to include this chain in the concept of a circular economy, with raw materials for products with high added value and expanding the useful life of waste. textiles that would be discarded.

Antecedentes da invenção:Background of the invention:

[005] As patentes vigentes atuais BR 10 2013 032157 5 B1 - “Processo de produção de material sólido rígido a partir de poliamida; elastano e glicerina” e BR 10 2013 032153 2 “Processo de produção de material sólido em pó a partir de poliamida; elastano e glicerina” se utilizam de glicerina como solvente e os processos se baseiam na dissolução e não fusão, que causam alteração na característica física causados pelo acúmulo de glicerina no interior do material, na qual não ocorre no presente processo com óleos vegetais.[005] Current current patents BR 10 2013 032157 5 B1 - “Production process of rigid solid material from polyamide; elastane and glycerin” and BR 10 2013 032153 2 “Process of producing solid powder material from polyamide; elastane and glycerin” use glycerin as a solvent and the processes are based on dissolution and not melting, which cause changes in the physical characteristics caused by the accumulation of glycerin inside the material, which does not occur in the present process with vegetable oils.

[006] O pedido de patente BR 10 2014 022512 9, “Processo de produção de superfícies não têxteis a partir de retraços têxteis de poliamida 6.6 com ou sem elastano” que se utiliza de altas temperaturas (acima de 260°C) e aquecimento por ar quente em fornos para fusão dos retalhos de tecido não permitindo a remoção do elastano e que pode causar perda de qualidade do produto.[006] Patent application BR 10 2014 022512 9, “Process of producing non-textile surfaces from textile polyamide 6.6 with or without elastane” which uses high temperatures (above 260°C) and heating by hot air in ovens to melt the fabric scraps, not allowing the removal of the elastane and which can cause loss of product quality.

Sumário da InvençãoSummary of the Invention

[007] O processo desenvolvido se baseia na completa fusão do resíduo de material têxtil, pela ação de óleos vegetais (virgens ou de fritura) ou gorduras. Esse processo permitiu a viabilização de uma nova fonte matéria prima a partir de retalhos de tecidos sintéticos, para a prática da economia circular na própria indústria têxtil como também fornecer matéria prima para outros setores produtivos que utilizam nylon (Indústria automotiva e indústria de plásticos de engenharia) além de permitir a remoção do elastano, que se torno um contaminante, do nylon.[007] The process developed is based on the complete melting of the textile material residue, by the action of vegetable oils (virgin or frying) or fats. This process allowed the viability of a new source of raw material from scraps of synthetic fabrics, for the practice of the circular economy in the textile industry itself, as well as providing raw material for other productive sectors that use nylon (automotive industry and engineering plastics industry). ) in addition to allowing the removal of elastane, which becomes a contaminant, from the nylon.

[008] O processo de reciclagem utiliza-se solvente biodegradável e renovável, podendo inclusive aplicar-se óleo residual de fritura do setor de restaurante e alimentação, tornando o processo mais barato e ambientalmente mais amigável.[008] The recycling process uses a biodegradable and renewable solvent, and residual frying oil from the restaurant and food sector can even be applied, making the process cheaper and more environmentally friendly.

[009] Assim a presente invenção busca: I. Dar destinação adequada aos retalhos de tecidos contendo poliamida e elastano diminuindo o impacto ambiental; II. Agregar valor as cadeias produtivas com a geração de matéria prima oriunda de um material que seria descartado; III. Reciclar o resíduo têxtil através de um processo seguro e ambientalmente amigável.[009] Thus the present invention seeks to: I. Give adequate disposal to fabric flaps containing polyamide and elastane, reducing the environmental impact; II. Add value to production chains with the generation of raw material from a material that would be discarded; III. Recycle textile waste through a safe and environmentally friendly process.

[0010] Desenvolveu-se um processo resultando a completa fusão dos resíduos de material têxtil sintético e a tendo como produto poliamida reciclada, por meio do uso de óleos vegetais ou gorduras. Esse resíduo não possui ainda uso e destinação correta, apresentando vários impactos ambientais e um problema a ser vencido. Dessa forma a invenção proposta trata-se de um processo que além de utilizar por completo todo o resíduo têxtil sintético, poder utilizar o resíduo da rede de restaurantes e alimentação, o óleo de fritura usado e agregar valor nas cadeias produtivas. Os novos produtos gerados são passiveis de retornar ao seu processo produtivo inicial, tratando o ciclo de vida completo, aplicando a economia circular; representando um grande e esperado avanço tecnológico para o setor.[0010] A process was developed resulting in the complete fusion of synthetic textile material residues and having recycled polyamide as a product, through the use of vegetable oils or fats. This residue does not yet have a correct use and destination, presenting several environmental impacts and a problem to be overcome. Thus, the proposed invention is a process that, in addition to completely using all synthetic textile waste, can use waste from the restaurant and food chain, used frying oil and add value in production chains. The new products generated are liable to return to their initial production process, treating the complete life cycle, applying the circular economy; representing a great and expected technological advance for the sector.

Descrição da invençãoDescription of the invention

[0011] Aquecer o óleo vegetal ou gordura previamente em um recipiente, através de qualquer meio, acima de 200°C. Adicionar os pedaços de tecido de Poliamida/Elastano (Figura 1) e submergi-los no óleo/gordura com agitação mecânica ou magnética até a fusão completa do tecido sempre mantendo a temperatura maior que 200°C e evitando temperaturas superiores a 230°C. Para uma maior decomposição térmica do elastano recomenda-se até 2 horas a 220°C.[0011] Heat the vegetable oil or fat previously in a container, by any means, above 200°C. Add the pieces of Polyamide/Spandex fabric (Figure 1) and submerge them in the oil/fat with mechanical or magnetic agitation until the fabric is completely fused, always keeping the temperature above 200°C and avoiding temperatures above 230°C. For greater thermal decomposition of elastane, up to 2 hours at 220°C is recommended.

[0012] Comprimir o sólido resultante contendo Poliamida/Elastano em um cilindro duplo ou espremer por compressão manual ou prensa, para extração do excesso de óleo/gordura (Figura 2).[0012] Compress the resulting solid containing Polyamide/Spandex in a double cylinder or squeeze by manual compression or press, to extract excess oil/fat (Figure 2).

[0013] Após o arrefecimento do material, moer ou triturar em um moinho ou triturador. Remover o óleo/gordura residual através detergentes, de preferência alcalinos ou através de saponificação com a adição de hidróxido de sódio (NaOH) aquoso em concentração de 5% a 50% (m/v) com ou sem aquecimento, por um tempo superior a 10 minutos. Enxaguar com água para remoção dos resíduos de detergente.[0013] After cooling the material, grind or crush in a mill or crusher. Remove residual oil/fat using detergents, preferably alkaline, or by saponification with the addition of aqueous sodium hydroxide (NaOH) in a concentration of 5% to 50% (m/v) with or without heating, for a time longer than 10 minutes. Rinse with water to remove detergent residue.

[0014] O produto, poliamida reciclada em grânulos, está representado na Figura 3.[0014] The product, recycled polyamide in granules, is represented in Figure 3.

[0015] Como processo adicional para remoção do elastano, lavar os grânulos de poliamida com etanol em temperatura entre 60 e 70°C. Breve descrição dos desenhos A Figura 1 exibe os retalhos de tecido contendo poliamida e elastano A Figura 2 representa a poliamida fundida após ação do óleo A Figura 3 mostra o produto resultante do processo de reciclagem (poliamida granulada)[0015] As an additional process to remove the elastane, wash the polyamide granules with ethanol at a temperature between 60 and 70°C. Brief description of the drawings Figure 1 shows the fabric scraps containing polyamide and elastane Figure 2 represents the polyamide melted after the action of the oil Figure 3 shows the product resulting from the recycling process (granulated polyamide)

Claims (7)

1-Processo de reciclagem de retalhos têxteis contendo Poliamida e Elastano utilizando óleos vegetais, caracterizado por compreender resíduos da indústria com material têxtil de poliamida (nylon) e Elastano, associado a óleos vegetais, este aquecido com temperatura entre 200°C e 260 °C, para obter grânulos de poliamida reciclada; compreender as seguintes etapas: I. Aquecimento do óleo vegetal ou gordura; II. Adição de pedaços de tecido de Poliamida/Elastano; III. Fusão; IV. Trituração ou moagem; V. Remoção do óleo residual do material; VI. Remoção do elastano; VII. Secagem;1-Recycling process of textile scraps containing Polyamide and Elastane using vegetable oils, characterized by comprising industrial waste with polyamide (nylon) and Elastane textile material, associated with vegetable oils, heated at a temperature between 200°C and 260°C , to obtain recycled polyamide granules; understand the following steps: I. Heating the vegetable oil or fat; II. Addition of Polyamide/Spandex fabric pieces; III. Fusion; IV. Crushing or grinding; V. Removal of residual oil from the material; SAW. Elastane removal; VII. Drying; 2- Processo de reciclagem de retalhos têxteis contendo Poliamida e Elastano utilizando óleos vegetais, conforme reivindicação 1, caracterizado pelo fato se colocar o óleo vegetal/gordura em um recipiente e aquecer através de qualquer meio, acima de 200°C até 260°C;2- Recycling process of textile scraps containing Polyamide and Elastane using vegetable oils, according to claim 1, characterized in that the vegetable oil/fat is placed in a container and heated by any means, above 200°C to 260°C; 3- Processo de reciclagem de retalhos têxteis contendo Poliamida e Elastano utilizando óleos vegetais, conforme reivindicação 1, caracterizado pelo fato de se adicionar os pedaços de tecido de Poliamida com Elastano até a fusão completa do tecido sempre mantendo a temperatura na faixa de 200°C a 260°C;3- Recycling process of textile scraps containing Polyamide and Elastane using vegetable oils, according to claim 1, characterized by the fact that the pieces of Polyamide with Elastane fabric are added until the complete fusion of the fabric, always keeping the temperature in the range of 200°C at 260°C; 4- Processo de reciclagem de retalhos têxteis contendo Poliamida e Elastano utilizando óleos vegetais, conforme reivindicação 1, caracterizado pelo fato de triturar o tecido fundido, Poliamida/Elastano em um moinho ou triturador;4- Recycling process of textile scraps containing Polyamide and Elastane using vegetable oils, according to claim 1, characterized by the fact of grinding the fused fabric, Polyamide/Elastane in a mill or crusher; 5- Processo de reciclagem de retalhos têxteis contendo Poliamida e Elastano utilizando óleos vegetais, conforme reivindicação 1, caracterizado por se remover o óleo/gordura do material triturado, utilizar detergentes ou tratar com soda caustica (concentração de 10% a 50%), seguido por lavagem com água;5- Recycling process of textile scraps containing Polyamide and Elastane using vegetable oils, according to claim 1, characterized by removing the oil/fat from the crushed material, using detergents or treating with caustic soda (concentration from 10% to 50%), followed by by washing with water; 6- Processo de reciclagem de retalhos têxteis contendo Poliamida e Elastano utilizando óleos vegetais, conforme reivindicação 1, caracterizado por se remover o elastano, lavar os grânulos com etanol entre 60°C e 70°C;6- Recycling process of textile scraps containing Polyamide and Elastane using vegetable oils, according to claim 1, characterized by removing the elastane, washing the granules with ethanol between 60°C and 70°C; 7- Processo de reciclagem de retalhos têxteis contendo Poliamida e Elastano utilizando óleos vegetais, conforme reivindicação 1, caracterizado por a poliamida triturada resultante ser levado para estufa até 105°C ao menos por 6 horas para secagem e ser destinado a uma extrusora ou injetora;7- Recycling process of textile scraps containing Polyamide and Elastane using vegetable oils, according to claim 1, characterized in that the resulting crushed polyamide is taken to an oven up to 105°C for at least 6 hours for drying and is destined for an extruder or injection molding machine;
BR102021014992-2A 2021-07-29 2021-07-29 RECYCLING PROCESS OF TEXTILE RETAILS CONTAINING POLYAMIDE AND ELASTANE USING VEGETABLE OILS BR102021014992B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12018133B1 (en) * 2021-05-07 2024-06-25 K Joy Nunn System and method of elastane removal for repurposing textiles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12018133B1 (en) * 2021-05-07 2024-06-25 K Joy Nunn System and method of elastane removal for repurposing textiles

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