Weft Knitting Spandex Yarn

Why Choose Us?

Rich experience

Xiamen Lilong Spandex Co., Ltd was established in 2003, It specializes in the R&D and production of high-tech specialty fibers.

High quality

The company introduced complete sets of continuous spinning production technology. High-temperature resistant, high-rebound, chlorine-resistant, phenol-resistant, and other differentiated spandex yarn from 12D to 1680D.

Technological innovation

Over the years, Lilon has fully utilized its talent and technological advantages, continuously exploring and innovating in the field of high-tech special fibers. It independently developed high-temperature resistant, high-rebound, chlorine-resistant, phenol-resistant, and other differentiated spandex with stability.

High quality service

Adhering to the spirit of "unity, positivity, development, and innovation", the company persists in the management policy of "promoting customer satisfaction with quality and meeting customer needs with innovation", winning customers and selling well worldwide.

What Is Weft Knitting Spandex Yarn

Weft knitting spandex yarn is a synthetic polymer. It is also called elastane fiber. Chemically, it is made up of a long-chain polyglycol combined with a short di-isocyanate, and contains at least 85% polyurethane. It is an elastomer, which means it can be stretched to a certain degree and it recoils when released. These fibers are superior to rubber because they are stronger, lighter, and more versatile. In fact, spandex fibers can be stretched to almost 500% of their length.

What Is Weft Knitting Spandex Yarn Made Of

One significant aspect of spandex yarn is its production process, which is carried out through various techniques like wet spinning, dry spinning, or reaction spinning. The most common method, however, is dry spinning. In this process, the spandex solution is first prepared by dissolving prepolymers in a solvent, creating a spinning dope. The dope is then forced through a spinneret, where it creates filament yarns by evaporating the solvent as the fibers are solidified. The resulting yarns are subsequently stretched, bundled together, and wound onto spools.

What Are the Different Types of Spandex Yarn

Spandex is a type of elastic fiber. It has strong elasticity with an extension of up to six hundred percent. And it can recover to its actual shape. In addition, it has high stability, is breathable, and is abrasion-resistant. When spandex yarn from manufacturers first appeared, it changed many areas of the apparel industry. Usually, the quantity of spandex manufacturers use in general clothes is relatively small. Usually, people blend spandex with other fibers, like polyester cotton yarn. In general, spandex is of four types.

Bare Yarn
Bare yarn is a hundred percent spandex yarn. Usually, manufacturers never use naked yarn directly on the fabric. They add bare spandex yarn when making knitwear. Yarn wholesale suppliers mainly interweave it with polyester cotton yarn or nylon yarn on a knitting device. Furthermore, the main products are tights, swimsuits, sportswear, stockings, socks, surgical bandages, cuffs, warp-knitted fabrics, etc.

Spandex Core Spun Yarn (CSY)
These yarn uses spandex yarn as the core. Then yarn wholesale suppliers spin it out of one or several non-elastic short fibers. It is not uncovered, which can fully reflect the surface factors of the outer fiber. Moreover, the cotton yarn fabric has the style and performance of cotton. It not only has good elasticity but also retains the high-end feel of the woolen fabric. Also, silk core-spun yarn fabric can show natural silk characteristics. They can spin spandex yarn by air spinning, ring spinning, vortex spinning, and other processing techniques. The yarn has the benefits of an extensive yarn count range, low spinning cost, and flexibility. The elasticity of the core-spun yarn is approximately 150%-200%. And the quantity of spandex is 7%-12%. For example, they can use spandex wrapped around polyester cotton yarn; core spun yarn to weave stretch denim, knitted fabrics, and other clothing accessories.

Covered Yarn (CY)
The spandex-wrapped yarn utilizes spandex yarn as the core. Then the use of inelastic filament or short fiber yarn is used to cover the stretched spandex yarn in a coiling manner. The number of coating layers and turns per centimeter of the outer coating can be divided into SCY (single-covered yarn) and DCY (double-covered yarn).

Ply Yarn (PLY)
Precisely, it can be twisted and stretched with an elastic spandex edge and two inelastic yarns to construct the yarn. Yarn wholesale suppliers produce it on a ring twister prepared with a special yarn-feeding appliance. And they mostly use it to knit thick materials with medium and low elasticity. The usual fabric is elastic labor cloth and elastic gabardine. Moreover, the article is evenly dried, and the product is clean. Nonetheless, the core wire is simple to expose. So the hand feels slightly hard. And it is not simple to make dark products.

Important Facts About Weft Knitting Spandex Yarn

● Does not wrinkle, can be stretched or elongated, and has a good shape.
● Feels good on the skin, is elastic, comfortable to wear, and has a perfect fit.
● Resistant to alkaline or acidic chemicals.
● Resistant to seawater, sweat, detergents, body oils, dry cleaner products, and sunscreen lotion.
● Does not fade easily and is compatible with different types of dyes.
● Does not easily wear out.
● Works with other fabrics such as synthetic, organic, and natural fibers.
● Lightweight and easy to clean (either hand wash or machine wash).
● Resistant to abrasive chemicals.
● Smooth, soft, and supple and does not cause any irritation to the skin when worn.
● Has greater tensile strength than rubber.
● Resistant to static electricity and does not pile-up.

Uses of different Spandex Yarn

Bare yarn

In terms of knit fabric production, it is particularly well-suited for hosiery and socks manufacturing.

Covered yarn

Suitable for foundation garments, swimwear, and support hose manufacturing.

Core spun yarn

In knit fabrics, specially for sportswear manufacturing

Blend spun yarn

For fabric manufacturing, that is ideal for calendaring.

Is Weft Knitting Spandex Yarn Same as Cotton

Weft knitting spandex yarn fabric is a synthetic fabric that is known for its stretchiness and elasticity. It is often used in combination with other fabrics to add stretch and improve the fit of clothing. While weft knitting spandex yarn fabric has some similarities with cotton fabric, it is not the same.

One key difference between weft knitting spandex yarn and cotton is their composition. Cotton is a natural fabric that is derived from the seeds of the cotton plant. It is soft, breathable, and comfortable to wear. Weft knitting spandex yarn, on the other hand, is a synthetic fabric that is made from a synthetic polymer called polyurethane. It is known for its stretchiness and elasticity, and is often used in combination with other fabrics to add stretch and improve the fit of clothing.

Another difference between weft knitting spandex yarn and cotton is their properties. Cotton is a strong and durable fabric that is easy to care for, but it does not have the same level of stretch as weft knitting spandex yarn. Weft knitting spandex yarn, on the other hand, is highly stretchy and elastic, but it is not as durable as cotton. It is also more difficult to care for, as it can be prone to snagging and tearing.

One type of weft knitting spandex yarn fabric that is popular for a wide range of applications is cotton weft knitting spandex yarn single jersey fabric. This fabric is made from a blend of cotton, weft knitting spandex yarn, and other synthetic fabric, and has a stretchy and comfortable feel. It is often used for activewear and other sportswear, but is also a popular choice for casual clothing.

Weft knitting spandex yarn fabric is a synthetic fabric that is known for its stretchiness and elasticity. While it has some similarities with cotton fabric, it is not the same. Cotton is a natural fabric that is soft, breathable, and easy to care for, while weft knitting spandex yarn is a synthetic fabric that is highly stretchy and elastic, but less durable. So, if you're looking for a stretchy fabric with good recovery, weft knitting spandex yarn may be the way to go.

Manufacturing Process of Weft Knitting Spandex Yarn

Weft knitting spandex yarn fibers are manufactured in four different ways- melt extrusion, reaction spinning, solution dry spinning, and solution wet spinning. The initial step in all these methods is that of reacting monomers to produce a pre-polymer. Pre-polymer is then reacted further, in a variety of ways, and drawn out to produce a long fiber. The most commonly used method is the solution dry spinning that produces over 90% of the world's weft knitting spandex yarn fibers.

First of all pre-polymer is produced by mixing a macro glycol with a di-isocyanate monomer. They are mixed in a reaction vessel and need the perfect conditions so that they may react to form a pre-polymer. Ratio of the component materials is responsible for giving different characteristics to the fibers. As such the ratio is strictly controlled. The ideal ratio of glycol to di-isocyanate may be 1:2.

In the chain extension reaction, the pre-polymer is reacted with an equal amount of di-amine. It results in a solution which is diluted with a solvent to produce the spinning solution. The solvent makes the solution thinner which can be easily handled. It can then be pumped into the fiber production cell.

In the fiber production cell, the polymer solution is pumped through a metal plate, called a spinneret, which has small holes throughout its structure. The solution gets aligned in strands of liquid polymer. The strands passing through the cell, are heated in the presence of a nitrogen and solvent gas. The liquid polymer gets chemically reacted and forms into solid strands.

A specific amount of the solid strands are bundled together to produce the desired thickness with the help of a compressed air device that twists the fibers together. As such, it can be said that each fiber of weft knitting spandex yarn is made up of many smaller individual fibers that join one another due to the natural stickiness of their surface.

The fibers are finally treated with textile finishing chemicals that can be magnesium stearate or other polymer such as poly(dimethyl-siloxane). These finishes prevent the fibers from sticking together and help in the process of textile manufacturing. Fibers are then transferred through a series of rollers onto a spool. The windup speed of the entire process depends on the thickness of the fibers that can be anywhere from 300-500 mi (482.7-804.5 km) per minute.

The spools with fiber, are put into final packaging and shipped to textile manufacturers or any other customers. The fibers here, may be blended with other fibers such as nylon or cotton fiber to produce the fabric that is used for clothing purposes. These fabrics can also be dyed in order to give a desired color to them.

Our Factory

Xiamen Lilong Spandex Co., Ltd was established in 2003, It specializes in the R&D and production of high-tech specialty fibers. Lilong company is the first spandex manufacturer in Fujian Province, which currently has more than 500 employees, with a total asset of 800 million yuan and covers an area of 130,000 square meters.
The company introduced complete sets of continuous spinning production technology. In May 2005, it officially commenced production, with an annual production capacity of 30,000 tons, The production line covers the main specifications ranging from 12D to 1680D. Over the years, Lilon has fully utilized its talent and technological advantages, continuously exploring and innovating in the field of high-tech special fibers. It independently developed high-temperature resistant, high-rebound, chlorine-resistant, phenol-resistant, and other differentiated spandex with stability. These products are widely used in textiles, clothing, woven tapes, and sanitary materials. Adhering to the spirit of "unity, positivity, development, and innovation", the company persists in the management policy of "promoting customer satisfaction with quality and meeting customer needs with innovation", winning customers and selling well worldwide.

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FAQ

Q: What is weft knitting spandex yarn?

A: Weft knitting spandex yarn is a synthetic polymer. It is also called elastane fiber. Chemically, it is made up of a long-chain polyglycol combined with a short di-isocyanate, and contains at least 85% polyurethane. It is an elastomer, which means it can be stretched to a certain degree and it recoils when released. These fibers are superior to rubber because they are stronger, lighter, and more versatile. In fact, spandex fibers can be stretched to almost 500% of their length.

Q: Why is warp knitting best?

A: The fabric produced by warp knitting has a flatter, closer, and less-elastic knit through the formation of loops in a vertical or warp-wise direction. Typically produced across beams, warp knit is the fastest way to convert yarn to fabric, making it efficient and cost-effective.

Q: What is the melting point of weft knitting spandex yarn?

A: Spandex fibers are damaged at high temperature. The melting temperature for spandex is about 240°C. high temperature from washing bath and dryer causes more spandex breaka

Q: What is the composition of weft knitting spandex yarn?

A: Chemical route to polyurethane polymer used in production of spandex. Spandex is mainly composed of a polyurea derived from the reaction of a diol and a diisocyanate. Two classes of spandex are defined by the "macrodiols".

Q: What happens if you heat weft knitting spandex yarn?

A: The high temperatures required for heat transfer can potentially damage the spandex material, causing it to melt or lose its elasticity. Therefore, while it is technically possible to use heat transfer on spandex, it is generally not recommended due to the risk of damaging the material.

Q: What is the difference between weft and warp knitting?

A: Weft knit: A weft knit is made with a single yarn looped horizontally to form a row, or course, with each row building on the previous one. Warp knit: A warp knit is made with numerous parallel yarns that are looped vertically at the same time.

Q: Is there latex in weft knitting spandex yarn?

A: Spandex, which is also called Lycra, Lycra spandex, or Elastane, is a synthetic that is comprised of a minimum of 85% polyurethane polymer. Spandex is not a latex-based product, and so is often recommended for people with latex allergies as a clothing replacement.

Q: What are the advantages of weft knitting?

A: The most important benefit of weft knitted fabric is its construction techniques. The fabric is capability to stretch and recover thus match to body shape. To achieve a desired fabric performance properties, the selection of suitable fibers and yarns are taken on to consideration.

Q: Is spandex a knit or woven fabric?

A: Spandex is a very elastic fibre. It can be used when making a woven or a knit fabric. A woven fabric with spandex in it will still behave like a woven fabric except the fibres themselves will stretch. A great example of this is stretch denim jeans.

Q: What happens if you tumble dry weft knitting spandex yarn?

A: Spandex: Spandex does not react well to heat, and therefore putting full spandex clothing, such as a bathing suit or leggings, into the dryer will caused the fabric fibres to weaken and break. Clothing that contains a small amount of spandex material, such as jeans, could be okay to put in the dryer.

Q: How do you make weft knitting spandex yarn?

A: Manufacturing process of spandex: Spandex fibers are manufactured in four different ways- melt extrusion, reaction spinning, solution dry spinning, and solution wet spinning. The initial step in all these methods is that of reacting monomers to produce a pre-polymer.

Q: Is weft knitting spandex yarn a cotton?

A: One key difference between weft knitting spandex yarn and cotton is their composition. Cotton is a natural fabric that is derived from the seeds of the cotton plant. It is soft, breathable, and comfortable to wear. Spandex, on the other hand, is a synthetic fabric that is made from a synthetic polymer called polyurethane.

Q: What are the positive effects of weft knitting spandex yarn?

A: Advantages: Lightweight and comfortable to wear, resistant to perspiration, has great elasticity, and is durable and strong. Sticks to your body, doesn't allow your skin to breathe easily, and is sensitive to heat. You can hand or machine wash spandex garments using warm water.

Q: What is the purpose of weft knitting spandex yarn?

A: Weft knitting spandex yarn is a lightweight, soft smooth synthetic fiber that has a unique elasticity. Due to its elastic property, it is used in making stretchable clothing. It is also known as 'elastane' in Europe and many other parts of the world.

Q: Is weft knitting spandex yarn better than cotton?

A: Cotton is a natural fabric that is soft, breathable, and easy to care for, while spandex is a synthetic fabric that is highly stretchy and elastic, but less durable. So, if you're looking for a stretchy fabric with good recovery, spandex may be the way to go.

Q: What does hot water do to weft knitting spandex yarn?

A: Use cold water: Weft knitting spandex yarn fabric is best washed in cold water. Hot water can weaken the elastic fibers, leading to loss of stretch and shape retention. The cold water helps preserve the integrity of the fabric while still effectively removing dirt and stains.

Q: What is the daily use of weft knitting spandex yarn?

A: Versatility: Cotton spandex fabric is versatile and can be used for various clothing items, including leggings, T-shirts, jeans, and activewear, as well as for home decor and upholstery.

Q: Why is weft knitting spandex yarn important to humans?

A: It is light and has high moisture wicking ability. It is also extremely stretchable and doesn't lose its elasticity with frequent use. What makes it the fabric of choice for athletes and gymnasts is it's low heat retention property and perfect body fitting ability without creating any pressure or tightness.

Q: What are the different types of weft knitting spandex yarn?

A: Generally, weft knitting spandex yarn fabric can be woven in four ways. These are bare, core-spun, covered, and twisted yarn. Furthermore, yarn wholesale suppliers should consider the fabric style and wearing prerequisites when selecting weft knitting spandex yarn. Thick stretch fabrics include stretch corduroy, stretch tarpaulin, stretch sturdy, etc.

Q: Why is weft knitting spandex yarn so popular?

A: The stretchy properties of spandex allow it to stretch out and go right back to its original form. Because it stretches so well, a garment can be made from much less raw material than regular fabric.

As one of the most professional weft knitting spandex yarn manufacturers and suppliers in China, we're featured by quality products and competitive price. Be free to wholesale bulk discount weft knitting spandex yarn from our factory. Contact us for customized service.

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