product - Elastic Core Spun Yarn

Manufacturer of Elastic Core Spun Yarn

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Elastic core-spun yarn is a kind of elastic yarn, which is made of elastic filament as core yarn and continuous wrapping of short fiber. This kind of yarn has the advantages of reliable spinning process, good yarn properties, elasticity of elastic fiber and less dewning phenomenon when drawing compared with the covered yarn, and is widely used in the development of elastic clothing textiles. However, the structure of the elastic core-spun yarn is an important factor that affects the performance of the elastic core-spun yarn.

Facilities

Features

  • Reliable yarn spinning process
  • Good yarn performance
  • good elasticity
  • Fewer exposed cores

Applications

Applicable Industries

  • Clothes manufacturing industry
  • Sports Apparel Manufacturing Industry
  • Elastic Fabric Manufacturing Industry

Applicable Products

  • socks
  • sweater
  • sport clothes
  • elastic clothes

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With the improvement of People's living standard and quality of life, textiles with good elasticity and durability are favored by people. There are many kinds of elastic fibers, the total can be divided into polyurethane fiber (such as polyurethane) , polyether elastic fiber (such as PET/PEO) , polyester elastic fiber (such as PBT, PTT, PET/PTT bicomponent crimp fiber) , polyolefin elastic fiber (such as Dow XLA fiber) and hard elastic fiber (such as hard elastic PP and polyvinylidene fluoride fiber) and so on. But the elastic fiber has the defects of easy aging and poor handle, so it is often needed to be wrapped and used in the fabric by the way of core-spun yarn.

Processing and development of elastic core-spun yarn

1. Single core elastic core spun yarn

Single core elastic core-spun yarn is a core sheath yarn composed of single elastic filament and short fiber, which can realize the complementary advantages between the two components, i. e. , the core provides elasticity, and the outer fiber provides strength and apparent characteristics. The structure and properties of elastic core-spun yarn are different with different spinning equipments. At present, most of the equipments for producing core-spun elastic yarn are refitted from ring spinning frame. In the actual production of ring spinning, it is difficult to control the variability of the nip bar and the characteristics of multi-unit production, and there must be internal and external transfer of the fiber in twisting, so the core wire can not be stabilized at the center of the cross section, the core of air-jet vortex spinning is stable at the center of the Vortex, and the fiber bundle is wrapped around the core layer by layer under the influence of the rotating air flow, therefore, the core-spun yarn can be formed due to the excellent cohesion among the components of the yarn and the uniform coating. By comparing the yarn structure and properties, it is found that the air-jet vortex spinning core-spun yarn is more ideal.

Single-core elastic core-spun yarn meets the basic requirements of elastic yarn, but there are still some defects that can not be ignored, such as the loss of yarn elastic elongation and the limited elasticity of the finished product The ability of fabric to keep original elastic property in long-term use is not ideal, and even the elastic recovery property decreases, which affects the comfort and aesthetics of wearing.

2. Double core stretch core spun yarn

Double core elastic core-spun yarn takes two filaments as core yarn and wraps short fibers. Its technical advantage is that the double-core structure combines or enhances the superior properties of the two filaments, improves the defects of the single-component core yarn, brings the composite advantages into full play, and endows the textile with unique style and functional characteristics. Domestic and foreign scholars have made many attempts to choose two core materials, and have successfully developed many kinds of double core elastic core-spun yarn with different fiber material combinations. There are three main types.

(1) double-core elastic core-spun yarn. When the two cores are elastic filaments, the core filaments are forced together to improve the elastic elongation and elastic recovery of the traditional single-core elastic core-spun yarn. Most of the biconflex filaments choose the combination of spandex and PET/PTT bicomponent composite filaments to give full play to the excellent elasticity of spandex filaments and the excellent elasticity recovery and stability of PET/PTT bicomponent composite filaments, it can produce elastic core-spun yarn with high elasticity and high resilience. The application of double-core elastic core-spun yarn greatly increases the elastic stability of the fabric, and improves the comfort and shape retention to meet the needs of consumers.

(2) rigid/elastic yarn double core elastic core-spun yarn. The two cores are rigid filament and elastic filament respectively, which can realize the composite of rigid material and elastic material, effectively solve the problems of poor serviceability of rigid material, and provide the conditions for the functional development of flexible textiles. If stainless steel filament is used as an excellent electromagnetic shielding material, it has some problems such as poor comfort and low ductility when used alone, the excellent elastic properties of spandex filament can make up the above mentioned defects of stainless steel filament and provide the possibility for the preparation of flexible radiation-proof clothing.

(3) soluble yarn/elastic yarn double core elastic core-spun yarn. In the double-core structure of core-spun yarn, soluble yarn is used, after dissolving soluble core-spun yarn, the pores can be formed in the coated fiber, and the main elastic core-spun yarn is in a loose contact state with the outer layer, the main elastic core yarn has more space for retraction. As the rebound resistance is reduced, the rebound effect is improved, so the fabric or clothing made of hollow elastic yarn can be quickly retracted to solve the problem of deformation during dressing.

Siro spinning technology should be adopted in the production of double-core elastic core-spun yarn, because the fiber transfer of single yarn in Siro spinning process is less than that in conventional ring spinning, and the fibers are arranged in a straight and close arrangement, which makes the surface of the yarn smooth, the yarn evenness and strength have been improved. At the same time, siro-spun yarn is fed with two roving, the width of strand is relatively wider, which is favorable to improve the covering effect of staple fiber on two-core filament. In the production of double-core elastic core-spun yarn, the tension of double-core filament needs to be controlled separately, especially when the elastic properties of the two core filaments are different, otherwise, the yarn structure will be unstable in the yarn forming process, resulting in broken ends, poor coating, dew core and rubber yarn. In order to realize the good feeding of double-core filament, the tension of filament winding and predrawing are controlled.

3. Nanostructured stretch core spun yarn

Nanofibers have high specific surface area and are ideal carriers for the construction of multifunctional textiles. However, due to the insufficient strength of the yarns directly spun by nanofibers, the product forms and applications of nanofibers in the textile field are limited. The core-spun yarn structure has the compound advantage. The electrostatic spinning nano-fibers are twisted and coated on the surface of the conventional yarn to form the nano-core-spun yarn, which can realize the organic combination of the nano-fibers and the traditional yarn, one-dimensional nanostructured materials are endowed with certain mechanical and elastic properties, and the problem of secondary processing of yarns is solved.

There are three main forms in the construction of nanostructured elastic core-spun yarn. One is the preparation of core-spun nanofibers by using ordinary filament as core yarn and wrapping elastic nanofibers as core yarn; the other is the preparation of core-spun nanofibers by wrapping elastic filament as core yarn and wrapping nanofibers as core yarn; the other is the preparation of core-spun nanofibers by using elastic core yarn as flexible support, the nanofibers are only used as part of the coating. The nanofibers prepared by electrospinning were wound onto the surface of the core layer to form core-spun nanoyarn by rotating airflow, disk or horn funnel. However, the existing preparation techniques are complex or do not take into account the arrangement of nanofibers on core-spun yarn, and different process settings will also lead to changes in the morphology and mechanical properties of the core-spun nanofibers. Therefore, further research is needed to optimize the preparation process to construct high-yield, high-orientation and high-orientation nanofiber coating. In the future, nanostructured elastic core-spun yarn will play an important role in the textile field if it can overcome the production limitation of nanometer one-dimensional materials.

Development and application progress of functional elastic core-spun yarn

1. Shape memory function core spun yarn products

Shape memory materials have the characteristics of pre-deformation induced by specific external conditions, and then returning to the pre-set shape after re-stimulation. Shape memory materials for textiles can be divided into shape-memory alloy and shape memory polymers (SMP) , both of which can meet the needs of environmental adaptability of textiles and have great development prospects in the preparation of smart textiles. The core-spun yarn made of shape memory fiber (SMF) can be used in the research and production of fancy yarn because shape memory activity is triggered by environmental change. If the shape memory core-spun yarn is heated to a temperature above the preset deformation recovery temperature, the coated fiber accompanying the shape recovery of the core-spun yarn also has a corresponding migration, and the deformation can still keep after cooling down. At present, this method has successfully spun coil yarn, coarse loose spiral yarn, chenille yarn and other shape memory fancy yarn. The fabric made of shape memory core-spun yarn has the advantages of good crease retention, anti-crease and anti-shrinkage, arching and recovery, and still retains the advantages of skin-friendly and comfortable outer fiber, it is very suitable for the production of high quality garment and medical textiles, and with the development of smart textiles, the application range of shape memory core-spun yarn will be further expanded.

2. Protective core spun yarn

Protective clothing is a kind of special clothing which can protect human body from the influence of bad environment and play an active protective role in some circumstances which may endanger human life or cause considerable damage to human body. The various kinds of protective clothing have been widely used in military, aerospace, aviation, fire control, medical treatment and electric power sectors. With the enhancement of People's awareness of protection, protective clothing has been expanding in the field of civil protection, such as radiation protection clothing in pregnant women's clothing application. According to the object of protection, protective clothing can be divided into flame retardant clothing, electromagnetic radiation clothing, bullet-proof clothing, antibacterial clothing, etc. . As a direct protective equipment, comfort is as important as protection in the design of protective clothing. The more comfortable the protective product is, the easier it is to be accepted by users. By using elastic core-spun yarn, protective clothing with good protection ability and comfortable effect can be obtained. At the same time, double-core elastic core-spun yarn is superior to single-core in elasticity and protection.

3. Elastic conductive core spun yarn

Flexible and conductive yarns can be obtained by using the core-spun structure. There are two kinds according to the way of obtaining: one is to coat conductive fiber or coating conductive layer on the stretchable elastic material; the other is to adopt double-core elastic core-spun yarn, the conductive filament and the elastic filament are both core-spun. The elastic conductive materials prepared by these two methods have excellent conductive properties. The difference lies in the location of the conductive materials, i. e. the exposed conductive layer and the core layer. The addition of the conductive material improves the anti-static function of the original elastic yarn and reduces the harm of electrostatic discharge and electromagnetic interference, the utility model can be used for making conductive clothing with the function of shielding electrostatic induction or for working clothing which is easy to produce electrostatic dangerous environment. In addition, elastic conductive yarn plays the role of conductive and signal transmitter, can become the key components of smart textiles and interactive textiles. For example, the development of flexible sensors as monitoring devices has a good potential in wearable health monitoring and human activity recording. In order to obtain high sensitivity of the sensor, nano-fiber materials are usually used. According to its sensing principle and the difference of material structure, the sensor can sense many kinds of physical or chemical stimulation such as temperature, pressure, displacement, current, etc. .

4. Core spun yarn with flexible storage function

Yarn-based flexible energy storage devices have good compatibility with traditional textile products, and have advantages of high energy density, long cycle life and high efficiency compared with non-linear energy storage devices, in recent years, the industry has attracted great attention. At present, the research and development of energy storage devices is mainly for the storage of electrical energy. Core-spun yarn has become a way to prepare linear stretchable ultracapacitors. Due to the characteristics of core-spun yarn with two components, charge transfer easily occurs on single yarn and the electrochemical stability of the yarn can be maintained under certain stress conditions. Linear stretchable ultracapacitors meet the needs of the fabrication of wearable electronic devices. In order to improve the electrochemical performance of the electrode materials, the effective specific surface area of the electrode active materials was increased to hold more transfer charges. At present, this kind of energy storage material only realizes the preparation of single-core core yarn, and has not been able to integrate the elastomer into it, so there is still a great room for optimization.

Future development trend of elastic core-spun yarn

With the improvement of social productivity, in response to the changes in social market demand, China's textile industry is speeding up the adjustment of product structure, in the direction of improving product quality transformation and upgrading. The production and development of elastic yarn should focus on the following three aspects: first, focusing fiber material from single to multi-element, the appearance and application of the new type elastic fiber improve the shape-retention and durability of the elastic core-spun yarn. The addition of more functional differential fibers gives the core-spun yarn special performance advantages Secondly, the yarn structure has been continuously optimized. The appearance of new structure yarns, such as double core elastic core-spun yarn and hollow elastic core-spun yarn, has greatly improved the performance of traditional elastic yarn, but more yarns with excellent structural properties need to be developed in the future. Third, there is still room for improvement in spinning equipment, how to improve the covering ratio of the core-spun fiber to reduce the whiteness of the core-spun Yarn and improve the diversity of the suitable materials is still to be explored by the academia and the industry.

The advantages of core-spun yarn are generally accepted, but in order to increase its market share, it is necessary to grasp the trend of the market, improve the level of research and development, and continuously expand the new application fields of stretch core-spun yarn. On the one hand, the future of textiles must pay more attention to multi-functional aggregation, so the development of smart wearable textiles can not be ignored. The core-coated structure products have great development advantages and potentials in the preparation of multi-functional and intelligent textiles, which can make the products both functional and comfortable, and solve the problems of poor serviceability of some products. As a new type of yarn, nanostructured elastic core-spun yarn can be used in many fields such as sensors, wearable capacitors and so on. On the other hand, performance-to-price ratio is still a prerequisite for the successful marketing of functional products, and the development of new structure elastic core-spun yarn, regardless of the renewal of spinning equipment, input cost of raw materials, and technical difficulties in production, are significantly higher than traditional yarn development, which will lead to higher market prices for their products. At present, spinning enterprises are developing to intensive and large-scale production through merger and reorganization and technical transformation in order to ensure the best products and reduce production costs. In addition, the cost control should return to the improvement of spinning equipment and the optimization of preparation process.

With the increasing diversification of core-spun yarn structure, the development of elastic yarn has reached a new height. The structure of the core-coated elastomer is stable, and the compound production makes full use of the characteristics of raw materials, and has the advantages of various materials. The appearance of new structure double-core elastic core-spun yarn further improves the performance of the original product, which has positive effect on both the improvement of yarn elasticity and the development of yarn protection function. However, the choice and cooperation of various elastic fibers and filaments, as well as the configuration of yarn processing parameters and process control changes will affect the final performance of elastic core-spun yarn products, according to the application of elastic core-spun yarn, how to optimize the combination of yarn materials, design a more reasonable yarn structure and configure a suitable yarn forming process is the key to improve the quality of elastic core-spun yarn in the future. While improving the product performance, we should also consider how to reduce the production cost, in order to occupy the market advantage.

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