Understanding How is Elastane Made: Revolutionizing Fit
Understanding Elastane: The Fabric Revolutionizing Fit. Elastane, also known as spandex or Lycra, is a synthetic fiber renowned for its exceptional elasticity. Elastane, spandex, and Lycra are all the same material, just different names used in different regions to refer to this highly elastic synthetic fabric made from polyurethane. Lycra is a branded textile and a trademarked name for elastane, often used to describe branded textiles that guarantee quality and authenticity. Found in a vast range of clothing items, from activewear and swimsuits to everyday basics like underwear and jeans, elastane has transformed the textile industry by adding comfort, flexibility, and durability to garments.
The history of elastane begins in 1937, when Otto Bayer and his associates at the IG Farben plant in Nazi Germany invented polyurethane. After World War II, the DuPont Corporation inherited IG Farben’s research and developed elastane from polyurethane, branding it as 'Lycra.' This innovation marked the beginning of branded textiles in the stretch fabric market, with Lycra becoming synonymous with high quality, elastic materials. Elastane, spandex, and Lycra are all the same material, and the term 'branded textiles' refers to products like Lycra that are recognized for their commercial branding and reputation.
In this post, we’ll explore what elastane is, how it’s made, and why it has become essential in modern apparel.
What is Elastane Synthetic Fabric?
Elastane is a highly elastic material and a long chain polymer created from polyurethane, a polymer known for its stretch properties. The fiber was first developed in the late 1950s as a revolutionary alternative to rubber, which had been commonly used in garments requiring stretch. Elastane is composed of long chain polymers known as polyurethane, specifically a polyether-polyurea copolymer. Elastane can stretch up to five to eight times its original size and snap back to its original form, making it ideal for form fitting clothing. The fiber is known by several brand names, including Lycra and spandex, but they all refer to the same elastane material.
How is Elastane Made Using Solution Dry Spinning?
The production of elastane begins when two chemicals, macroglycol and a diisocyanate monomer, interact to form a prepolymer solution. The volume ratio between macroglycol and diisocyanate is critical, with a common ratio of 1:2. This prepolymer is then reacted with diamine acid in a chain extension reaction, resulting in a reaction spinning solution. The prepolymer solution is diluted with a solvent such as dimethylacetamide (DMAc) or dimethylformamide (DMF) to make it easier to handle before being placed inside a fiber production cell. Inside the cell, the solution is pushed through a spinneret, where holes form to create fibers, a process known as cell spins. As the solution passes through the spinneret, the solvent evaporates in a heated chamber, solidifying the fibers. The fibers are then heated within a nitrogen and solvent gas solution to form solid strands.
After spinning, a finishing agent such as magnesium stearate is applied to the fibers to prevent them from sticking together. The fibers are then bundled and subjected to a twisting process, which creates the final elastic fibers. These fine filaments are later combined into multifilament yarns, transferred to a spool, and are then ready to be dyed or woven into fabrics.
There are four main methods for producing elastane: reaction spinning, solution wet spinning, melt extrusion, and solution dry spinning. The dry spinning method is the most common, and solution dry spinning is now used to produce approximately 95 percent of the world's spandex supply. In wet spinning, the polymer solution is extruded into a chemical bath to solidify, while melt extrusion, a more eco friendly method, is currently under development. The production process is energy intensive and involves the use of various chemicals, contributing to the higher cost of elastane compared to other synthetic fabrics. Elastane can also withstand high temperatures during manufacturing and use, making it suitable for a wide range of applications.
Key Properties and Benefits of Elastane
- Exceptional Elasticity and Stretch: Elastane is an elastic fabric known for its remarkable ability to stretch up to five to eight times its original length without breaking, providing freedom of movement in garments. This quality is essential in sportswear, underwear, and form fitting apparel, where flexibility is crucial.
- Durability and Recovery: Unlike rubber, elastane is highly resistant to wear and tear. It exhibits excellent elastic recovery, meaning it returns to its original shape after stretching, even after extensive use. The polymer structure, particularly the hard segment, contributes to the material's elasticity and durability. Elastane's high tensile strength, resulting from its polymer structure and processing methods, further enhances its durability. Additionally, elastane is resistant to thermal degradation, but it can break down if exposed to excessive heat.
- Lightweight and Breathable: Elastane is a lightweight fiber that doesn’t add bulk to garments, which is ideal for items that need to be both breathable and comfortable, such as activewear and undergarments.
- Wrinkle Resistance: Thanks to its stretch recovery properties, elastane doesn’t wrinkle easily, making it a low maintenance choice in blended fabrics for everyday wear.
Uses of Elastane in Clothing
Elastane is rarely used on its own; instead, it's typically blended with other fibers like cotton, polyester, or nylon. This blend allows for stretch and flexibility in the fabric while maintaining the desirable properties of the other fibers. Elastane is widely used in:
- Activewear: The stretch and breathability of elastane make it ideal for leggings, sports bras, and other athletic clothing that requires movement without restriction.
- Swimwear: Elastane's ability to resist damage from chlorine and UV rays makes it an essential component in swimsuits.
- Denim and Jeans: Jeans blended with elastane offer a comfortable, stretchy fit without compromising on durability.
- Underwear and Lingerie: Elastane provides the stretch and comfort needed in undergarments, ensuring a snug yet non restrictive fit.
Caring for Elastane Garments
Proper care can extend the life of elastane blended garments. Avoid high heat when washing or drying, as excessive heat can break down the fibers over time. Hand washing or using a gentle machine cycle with cool water is recommended, and air drying helps preserve elasticity. Avoid bleach and harsh detergents, as they can weaken the fibers and reduce the garment's lifespan.
Sustainability of Elastane
Elastane, often called spandex or Lycra, has become a staple in modern textiles, especially in garments that demand stretch and comfort like yoga pants and form fitting underwear. However, the sustainability of this synthetic fabric is a growing concern, as its production and disposal present significant environmental challenges.
The manufacturing process of elastane is complex and energy intensive, relying entirely on synthetic materials derived from fossil fuels. The most prevalent method, solution dry spinning, accounts for about 95% of the world’s spandex supply. In this process, production begins in a fibre production cell, where a macroglycol is combined with a diisocyanate monomer to create a prepolymer. This prepolymer then undergoes a chain extension reaction with diamine acid, resulting in a liquid polymer. The polymer is diluted with a solvent to form a spinning solution, which is then pushed through a spinneret, a device with many tiny holes, inside a cylindrical spinning cell. As the solution passes through these tiny holes, it enters a heated chamber filled with a solvent gas solution, triggering a chemical reaction that solidifies the polymer into solid strands. These strands are then bundled and twisted by a compressed air device, producing the many tiny strands that make up elastane fibers.
Other spinning methods, such as solution wet spinning, melt extrusion, and reaction spinning, are also used in elastane production, but to a much lesser extent. Regardless of the method, the result is an entirely synthetic fabric with incredible elasticity and resilience, but one that is produced without any organic materials.
The environmental impact of elastane is significant. The manufacturing process is not only energy intensive but also heavily dependent on fossil fuels, leading to high carbon emissions. In fact, the production of synthetic fabrics like elastane generates CO2 emissions that are several times higher than those from natural fibers such as cotton. The extraction and processing of oil and gas for elastane production contribute to a range of environmental issues, including oil spills, methane emissions, water and air pollution, and biodiversity loss. Additionally, elastane is not biodegradable; it can persist in landfills for hundreds of years, slowly breaking down and releasing toxic chemicals into the soil and groundwater.
Another major concern is the release of microplastics. During washing, wearing, and disposal, elastane fibers shed tiny plastic particles, microplastics, that are less than five millimeters in size. These microplastics easily pass through wastewater treatment systems and end up in rivers, oceans, and even the food chain. Studies have found microplastics from synthetic fabrics like elastane in seafood, salt, and drinking water, raising concerns about their impact on human health.
In response to these challenges, textile manufacturers are exploring more sustainable approaches to elastane production. Green chemistry initiatives are focusing on using bio-based polyols and diisocyanates to reduce reliance on fossil fuels and minimize toxic byproducts. Efforts are also underway to recycle spandex waste and develop spandex blends with more sustainable fibers, aiming to lower the overall environmental footprint of elastane fabric. Some companies are already producing recycled spandex, while others are innovating with new spinning methods and finishing agents to improve recyclability and reduce emissions.
While elastane remains a popular fiber for its stretch and comfort, its sustainability is a pressing issue for the textile industry. By prioritizing green chemistry, recycling, and responsible manufacturing processes, the industry can work towards reducing the environmental impact of elastane and other synthetic fabrics, paving the way for a more sustainable future in fashion and textiles.
Conclusion
Elastane has transformed the textile industry by offering a combination of comfort, flexibility, and durability unmatched by other fibers. Whether in activewear, everyday basics, or high performance gear, elastane provides the stretch and resilience that modern fashion demands. Understanding elastane's unique properties and care requirements helps in appreciating the significant role this fiber plays in enhancing comfort and style. For those interested in exploring how versatile accessories can elevate everyday looks, check out mini hair clips: small in size, big on style.
