COMPOSITE YARN, PREPARATION METHOD THEREOF AND ELASTIC FABRIC
The present invention relates to a composite yarn, a preparation method thereof and an elastic fabric, wherein the composite yarn comprises a core yarn and an outer wrapping yarn, wherein the core yarn further comprising at least one piece of elastic filament, and wherein the outer wrapping yarn is made of short fiber, wherein the outer wrapping yarn is spirally wrapped on the core yarn, wherein drafting ratio of the core yarn is 1-1.5 times.
This disclosure generally relates to the technical field of textiles, and more particularly, to a composite yarn, a method of preparation thereof and an elastic fabric.
BACKGROUNDAs a fashion clothing, jeans has always been popular among consumers (especially teenagers) for more than a century. The denim fabric is formed by interweaving a classic indigo-blue pure cotton yarn and a white pure cotton yarn into a crow-twill structure. However, as time passes, people start to demand more on the comfort of the clothing other than just design and style. To meet the demand, an elastic fabric is developed to replace the conventional non-elastic denim fabric, which allows people to move more freely and comfortably.
Reducing the weft shrinkage of the high-elastic denim fabric normally employs the following methods: first, performing a high-temperature shaping in the post-finish process; second, performing pre-shrinking multiple times; third, heating and washing the prepared denim fabric using a dye vat. However, the aforesaid methods reduce the shrinkage rate by means of a post-finish processing instead of solving the shrinkage problem at the beginning of the process, resulting in long and complex production process, high production cost and poor product quality.
The elastic fabric is generally formed by interweaving a weft yarn and a warp yarn, wherein the weft yarn is made of an elastic yarn (i.e., a core yarn), which endows the fabric with a certain elasticity. A core yarn takes an elastic filament as a core, and the exterior of the elastic filament is wrapped by a non-elastic short fiber. As short fiber shrinks after being heated due to high water-absorption rate, the conventional core yarn structure makes the shrinkage rate of the elastic fabric unstable. The conventional core yarns are mainly divided into a single core yarn and a double core yarn. During the spinning process, the elastic filament is wrapped by a rough yarn made of a short fiber on a spinning machine, and after drafting, twisting and winding, a composite yarn is obtained. Typically, the core yarn adopts a low denier filament having a large drafting ratio (the drafting ratio is 2-4 times and normally 3.5 times or more). If the degree of twisting is excessively low when the elastic filament is wrapped by the short fiber rough yarn, the fiber cannot be tightly held by the rough yarn, and as a result, the inner and outer fiber become loose easily. Consequently, the shrinkage rate of the fabric made from the aforesaid yarn is high. Meanwhile, during the wrapping, weaving and post-finishing (especially during the high temperature shaping), the elastic filament can be severely damaged. Under such circumstances, when the finished garment is washed with water (using physical and chemical methods), the elastic filament can be further damaged such that local loss of elasticity may occur. Contrarily, if the degree of twisting is excessively high when the elastic filament is wrapped by the short fiber rough yarn, although the shrinkage of the prepared fabric is relatively small, the elasticity of the fabric will be low and the corresponding tensile force will be high, making the garment uncomfortable to wear.
Moreover, if the shrinkage rate of the elastic fabric cannot be stably controlled, serious curling occurs when the fabric is cut, and the size of the garment becomes unstable after sewing, leading to the poor quality of products. Therefore, as previously mentioned, the elastic fabric needs to undergo a post-finish process to address this issue. When the fabric goes through the post-finishing, the fabric typically shrinks by 5%-7%, and the width of the fabric is reduced accordingly. After the post-finish process is completed, especially after the pre-shrinking and high-temperature shaping are ended, the shrinkage rate of the prepared fabric can be generally controlled at −10%˜−16%, however, its width will only be 60-70% of the original fabric.
Presently, there is a covering yarn sold on the market, which is also known as a wrapping yarn. It is a yarn having a novel structure, which uses a chemical fiber filament yarn as the core yarn, and uses another chemical fiber filament yarn as the outer wrapping yarn, wherein the outer wrapping yarn wraps around the core yarn in a spiral manner. Because the water absorption rate of the chemical fiber filament yarn is low, the shrinkage rate of the fabric prepared by using the wrapping yarn is also low. The wrapping yarn having the aforesaid structure is primarily used for preparing the knitted fabric. Because the tactility of the woven fabric is poor and the elasticity is low, it is not suitable for the preparation of denim fabric.
In conclusion, how to make the elastic fabric maintain a certain elasticity (preventing the loss of elasticity from occurring), how to guarantee a stable and low shrinkage rate and maintaining the size of the fabric, and how to achieve an ideal retro effect of the fabric are technical problems that hinder the development of elastic fabric and need to be solved urgently.
SUMMARYThe present invention discloses a composite yarn, a preparation method thereof and an elastic fabric. According to the present invention, the technical problems relating to the high shrinkage rate and low stability of elastic fabric caused by core yarn wrapped with outer wrapping yarn made of short fiber are effectively solved.
The present disclosure adopts the following technical solution: a composite yarn comprising a core yarn and an outer wrapping yarn, wherein the core yarn is composed of at least one elastic filament, and the outer wrapping yarn is made of short fiber, wherein the outer wrapping yarn is spirally wrapped around the core yarn, and the drafting ratio of the corn yarn is 1-1.5.
In another embodiment of the present invention, the degree of twisting of the outer wrapping yarn is 8.48-36 twists/inch, and the length of the outer wrapping yarn is more than 1.5 times that of the core yarn.
In another aspect of the present invention, the number of winding turns of the outer wrapping yarn on the core yarn is more than 15 per 1 cm (centimeter).
In another aspect of the present invention, the number of winding turns of the outer wrapping yarn on the core yarn is 15-40 per 1 cm (centimeter).
In another aspect of the present invention, the counts of the outer wrapping yarn are 10-80S, and the denier of the core yarn is 20D-500D.
In another aspect of the present invention, the short fiber is a fiber having a length ranging from 10-90 mm (millimeter), and the short fiber is a natural fiber or a chemical fiber.
In another aspect of the present invention, the short fiber is a cotton fiber, a tencel fiber, a modal fiber, a polyester fiber or a nylon fiber.
In another aspect of the present invention, the short fiber is a cotton fiber.
A preparation method of the composite yarn, comprising the steps of:
Processing the short fiber into a rough yarn, and processing the rough yarn into an outer wrapping yarn through a spinning process;
Placing a corn-yarn spool on a feeding roller, drawing the core yarn into a hollow spindle through a pre-drafting roller, and imposing a drafting force having a drafting ratio of 1-1.5 times on the core yarn by the pre-drafting roller;
Feeding the core yarn into the hollow spindle, making the core yarn pass through the center of the hollow spindle, and leading out the outer wrapping yarn along with the rotation of the hollow spindle, thus making the outer wrapping yarn wrap on the hollow spindle; finally, through an air-ring guiding hook, a yarn-guiding roller and a pressing roller, winding to obtain a finished composite yarn, wherein during the wrapping process, the twisting degree of the outer wrapping yarn is 900-1500 twists/m.
An elastic fabric, formed by interweaving a warp yarn or a weft yarn, wherein the weft yarn comprises the composite yarn.
Compared with the prior art, the present disclosure has the following advantages: the composite yarn has an improved structure compared with the conventional yarn, wherein the elastic filament is wrapped by the yarn made of a short fiber, thus obtaining a novel wrapping yarn; the composite yarn of the present invention is used on woven fabric; the woven fabric shows an ideal retro effect, and has low shrinkage rate and excellent elasticity.
The present invention discloses a composite yarn, a preparation method thereof and an elastic fabric. To better illustrate the purposes, technical solutions and effects of the present invention, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are merely used to elaborate the present invention and are not used to limit the present invention.
In the description of the present invention, it should be understood that the orientations or positions indicated by the terms “central”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise” and “counterclockwise” are based on the orientations or positions shown in the figures, or the orientations or positions that the product of the present invention is commonly placed during use, or the orientations or positions that are commonly understood by those skilled in the art. They are merely for the convenience of describing and simplifying the description of the present invention, but not indicating or implying that the equipment or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Thus, they cannot be understood as a limitation of the present invention. In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as the indication or implication of relative importance or the implication of the number of indicated technical features. Thus, a technical feature defined as “first” or “second” may explicitly or implicitly comprises one or more technical features. In the description of the present invention, unless being clearly stated, “a plurality of” means two or more.
In the description of the present invention, unless being clearly stated, the terms “installation” and “connection” shall be understood in a broad sense. For instance, it may be a fixed connection, a detachable connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, an internal connection of two components or an interaction between two components. For those skilled in the art, the specific meanings of the above terms in the present invention may be understood according to specific circumstances.
In the description of the present invention, unless being clearly stated and specified, the first feature being “above” or “below” the second feature may indicate a direct contact between the first and second features or an indirect contact between the first and second features through other features. Moreover, the first feature being “above” the second feature may indicate that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being “below” the second feature may indicate that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.
The following description discloses various embodiments for implementing various structures of the present invention. To simplify the description of the present invention, components and arrangements of specific embodiments are described below. Definitely, they are merely examples and are not intended to limit the present invention. Furthermore, in the present invention, reference numerals and/or reference letters in different embodiments may be repeated for the purpose of simplification and clarity, which does not indicate the relationship between various embodiments and/or arrangements discussed. Additionally, the present invention discloses embodiments of various processes and materials, which allow those skilled in the art to associate themselves with the application of other processes and/or the use of other materials.
The present invention discloses a composite yarn, with an improved structure compared with the conventional outer wrapping yarn. As shown in
In the technical solution of the present invention, the length of the composite yarn refers to a section of the finished composite yarn cut out for measurement. The length of the outer wrapping yarn 6 refers to the length after being tensioned, which is more than 1.5 times of the length of the core yarn 21. The length of the core yarn 21 refers to the length of the portion located within the composite yarn in a tensioned state, which is equal to the length of the composite yarn.
The outer wrapping yarn 6 is a single yarn, and its original twisting degree is 8-30 twists/inch before the wrapping process. After being twisted and wrapped, the twisting degree of the outer wrapping yarn 6 increases by 6-20%, and its twisting degree reaches 8.48-36 twists/inch.
The drafting ratio refers to tensioning the elastic filament using a certain tension force. For instance, if the drafting ratio is 2 times, the length increases by 2 times.
According to the technical solution of the present invention, the drafting ratio of the core yarn 21 is 1-1.5. The small drafting ratio of the core yarn 21 has the following advantages:
Because the drafting ratio of the core yarn 21 in the composite yarn is small, the tensile property of the core yarn 21 protects the core yarn 21 from being excessively tensioned even if it is pulled during the weaving process thus significantly reduce damage to the core yarn 21.
In the high temperature treatment, the damage to the elastic filament in a tensioned state is greater than that to the elastic filament in a natural state. Therefore, in the post-finishing process, the high temperature of the shaping treatment causes less damage to the elastic filament with smaller drafting ratio. Thus, an excellent elastic performance is ensured.
When the finished garment is washed, especially at the sewing positions, as the core yarn 21 is in a low tensile state, and the resilience of the core yarn 21 is low. Therefore, the shrinkage of the core yarn 21 and the outer wrapping yarn 6 is relatively synchronous, which effectively prevents loss of elasticity as well as bulges at seam joints and front zipper.
The small drafting ratio and the low resilience of the elastic filament make the elastic filament stretch more easily and recover to its natural state to improve the comfortness of the fabric.
The elastic filament of the core yarn 21 does not need to be tensioned for a long time, reducing the probability of elastic fatigue. The elastic filament maintains high tensile and resilient properties, and the core yarn 21 can maintain stable elasticity for a long period of time, meaning that the elasticity of the composite yarn is stable.
During the wrapping process, the outer wrapping yarn 6 is also twisted, allowing the fiber in the outer wrapping yarn 6 to be held more compactly. As the friction between the fiber increases, the inner and outer migrations of fiber become difficult such that the fabric made of this composite yarn has high stability. Preferably, the twisting degree of the outer wrapping yarn 6 is controlled to be 900-1500 twists/m (meter). When the twisting degree of the outer wrapping yarn 6 is properly controlled, it can be evenly spirally wrapped on the core yarn 21, achieving good wrapping and shaping effects. Meanwhile, it is not easy for the fiber to slide, which effectively reduces the shrinkage of the fabric. Moreover, properly increasing the twisting degree prevents the composite yarn structure from distorting due to the excessively-tight holding. If the composite yarn distorts, the tactility of the fabric may be affected causing skin itchiness. Due to the small drafting ratio of the elastic filament, the low resilience allows the elastic filament to stretch naturally significantly reduces damages to the elastic filament. Additionally, the wrapping process makes the inner and outer migrations of the fibers in the yarn more difficult. friction between fibers increases, which in turn increases the hardness of the yarn. When the composite yarn is used for weaving as a warp yarn or a weft yarn, the friction in the weaving area is greater, which makes the yarn difficult to slide. Therefore, after the regular post-finishing process, the shrinkage rate of the fabric made of the composite yarn is stable and small. After each process, the shrinkage rate varies slightly, and the fabric width varies slightly, which makes the width of the finished fabric reach 80-90% of that of the original fabric. As the surface of the core yarn 21 is spirally wrapped by the outer wrapping yarn 6, when the fabric is tensioned, the length of the outer wrapping yarn 6 enables the fabric to be effectively stretched, and when the fabric is tensioned to a certain degree, the performance of the outer wrapping yarn 6 prevents the fabric from continuously being stretched, thus protecting the core yarn 21 against the damage caused by an excessive stretching of the fabric. Meanwhile, the spiral wrapping method is to make the outer wrapping yarn 6 rotate, twist and then spirally wrap the core yarn 21 in the form of circles. The squeezing force imposed by the outer wrapping yarn 6 on the core yarn 21 is relatively small, allowing the elastic filament to stretch and contract freely. Moreover, the drafting ratio of the elastic filament is small, ensuring that the composite yarn has excellent elasticity. Thus, the fabric woven with the composite yarn also has excellent elasticity. However, in the preparation process of the conventional composite yarn, the elastic filament is wrapped by rough yarn made by short fiber while being twisted. The elastic filament is greatly restricted due to the greater twisting degree which result in greater pressure borne by the elastic filament.
In the present invention, the length of the outer wrapping yarn 6 is at least 1.5 times that of the core yarn 21, and the number of winding turns of the outer wrapping yarn 6 on the core yarn 21 is more than 15 per 1 cm (centimeter). In this way, the surface of the core yarn 21 is evenly wrapped by the outer wrapping yarn 6, which prevents the core yarn 21 from exposing such that the core yarn 21 is effectively protected against the damage caused by friction. Preferably, the number of winding turns of the outer wrapping yarn 6 on the core yarn 21 is 15-40 per 1 cm (centimeter). In this range, the yarn can be evenly wrapped on the elastic filament, and the loops can be closely connected without squeezing each other.
In the present invention, the counts of the outer wrapping yarn 6 can be 10-80S, and the denier of the core yarn 21 can be 20D-500D. The counts of the outer wrapping yarn 6 should not be excessively high, because the higher the counts of yarn are, the lower the strength of the yarn becomes. Moreover, it makes the yarn easy to break during wrapping, creating quality problems. As for the unit of yarn count, S represents the counts of yarn in an English system, which refers to how many 840-yards contained in the total length of one pound of yarn at the conventional moisture regain. D is the abbreviation of Denier, which represents the fineness of chemical fiber. It refers to the weight (grams) of 9000-meter-long filament at the conventional moisture regain.
In the present invention, the outer wrapping yarn 6 must be a yarn made of a short fiber having a length ranging from 10-90 mm (millimeter). The short fiber can be a natural fiber or a chemical fiber, including cotton fiber, tencel fiber, modal fiber, polyester fiber or nylon fiber, etc. Preferably, the short fiber is a cotton fiber, because cotton fiber is natural, common, skin-friendly and has good tactility.
The core yarn 21 is made of an elastic filament, including a polyurethane filament, a polyolefin filament, a rubber filament or a two-component filament, etc.
The conventional structure of the wrapping yarn is to wrap the elastic filament using a chemical filament. However, the tactility of the woven fabric is poor, its elastic elongation is low, it is difficult to stretch and the retro effect is poor. In the technical solution of the present invention, the structure of the conventional wrapping yarn is improved, wherein the elastic filament is wrapped by the yarn made of a short fiber. After being used for weaving, the woven fabric shows an ideal retro effect, and has low shrinkage rate and excellent elasticity.
Conventional core yarns are primarily single core yarn and a double core yarn. During the spinning process, elastic filament is wrapped by a rough yarn made of a short fiber on a spinning machine, and after drafting, twisting and winding, a composite yarn is obtained. Typically, the core yarn is a low denier filament having a large drafting ratio. If the twisting degree is excessively low when the elastic filament is wrapped by the short fiber rough yarn, the fiber cannot be tightly held, and inner and outer fiber migrations may easily occur. As a result, the shrinkage rate of the fabric made from the aforesaid yarn is high. Meanwhile, during the wrapping, weaving and post-finishing (especially during the high temperature shaping), the elastic filament may be seriously damaged. Under such circumstances, when the finished garment is washed with water (using physical and chemical methods), the elastic filament may be further damaged such that a local loss of elasticity may occur. Contrarily, if the twisting degree is excessively high when the elastic filament is wrapped by the short fiber rough yarn, although the shrinkage of the prepared fabric is relatively small, the elasticity of the fabric is low and the tensile force required is large, making the garment uncomfortable to wear.
The composite yarn is prepared by using the outer wrapping yarn 6 to wrap the elastic filament. The outer wrapping yarn 6 in the composite yarn spirally wraps the elastic filament in the form of circles. The squeezing force imposed by the outer wrapping yarn 6 on the elastic filament is smaller than that imposed by the conventional one, and the fiber in the composite yarn are held more tightly. As the inner-layer elastic filament has a small drafting ratio, it may be freely stretched such that the elastic filament is less controlled by the outer wrapping yarn 6. Thus, during the weaving or post-finishing process, especially during the high temperature shaping, the damage to the inner-layer elastic filament is small, achieving an excellent elastic performance of the fabric. Moreover, the twisting degree of the outer wrapping yarn is higher than that of the conventional rough yarn, which enables the fiber in the yarn to be held more closely while making the inner and outer migrations of the fiber more difficult. Therefore, a high stability of the fabric size is achieved.
The present invention discloses a preparation method of the composite yarn, which primarily utilizes a hollow spindle for wrapping. The hollow spindle spinning utilizes the rotation of the hollow spindle to propel the outer wrapping yarn 6 to rotate, thus enabling the outer wrapping yarn 6 to spirally wrap the core yarn 21 through the hollow spindle. During wrapping, the core yarn 21 passes through the hollow position of the hollow spindle from the feeding roller, and the drafting ratio of the core yarn 21 is 1-1.5 times. Subsequently, the outer wrapping yarn 6 is spirally wrapped on the core yarn 21. By changing the twisting degree, the yarn can be evenly wrapped on the elastic filament.
Specifically, the preparation method of the composite yarn, comprising the steps of: Processing the short fiber into a rough yarn, and processing the rough yarn into an outer wrapping yarn 6 through a spinning process;
Placing a corn-yarn spool on a feeding roller, drawing the core yarn 21 into a hollow spindle through a pre-drafting roller, and imposing a drafting force having a drafting ratio of 1-1.5 times on the core yarn 21 by the pre-drafting roller;
Feeding the core yarn 21 into the hollow spindle, making the core yarn 21 pass through the center of the hollow spindle, and leading out the outer wrapping yarn 6 along with the rotation of the hollow spindle, thus making the outer wrapping yarn 6 wrap on the hollow spindle; finally, through an air-ring guiding hook, a yarn-guiding roller and a pressing roller, winding to obtain a finished yarn.
Furthermore, the preparation method of the composite yarn, comprising the steps of:
Placing a corn-yarn spool 2 on a feeding roller, and releasing the corn yarn 21 through propelling the corn-yarn spool 2 to rotate; making the core yarn 21 pass through a hollow spindle 5 of the spinning machine through a tangential belt 4 at a certain drafting ratio under the action of a pre-drafting roller, thus making the corn yarn to move linearly; subsequently, placing the outer wrapping yarn 6 on the hollow spindle 5, and making the hollow spindle 5 run at a high speed under the action of a transmission mechanism, thus unwinding the outer wrapping yarn 6 at a certain speed and allowing the outer wrapping yarn to evenly wrap the corn yarn 21 moving linearly to form a composite yarn; making the composite yarn pass through an air-ring guiding hook 8 to control the fixed position of the composite yarn; finally, through a guiding roller 9, a pressing roller 10, a reciprocating guide device 11 and a curling roller 12, winding the composite yarn on a spool 13 parallel to the outer wrapping yarn.
In the wrapping process, the twisting degree of the outer wrapping yarn 6 is 900-1500 twists/m.
The present invention is further described through the following embodiments:
Embodiment 1The warp yarn is a 10S pure cotton yarn, and the weft yarn A1 is a 15S pure cotton+180D spandex single core yarn, wherein the drafting ratio of the spandex is 3.5 times, and the warp yarn is interwoven with the weft yarn A1 to form a fabric 1. The weft yarn A2 adopts a 15S pure cotton yarn spirally wrapping a 180D spandex, wherein the drafting ratio of the spandex is 1.5 times, and the warp yarn is interwoven with the weft yarn A2 to form a fabric 2. Fabric 1 and fabric 2 are 3/1 twill structures.
Fabric 1 and fabric 2 are processed by the following conventional post-finishing process:
In a singeing machine, the temperature of the flame is controlled to be 800° C., and the speed of the singeing vehicle is controlled to be 70 m/min, wherein the singeing process adopts a two-face-one-back singeing, namely, the front side of the fabric is singed twice, and the back side of the fabric is singed once;
A desizing machine is used to perform a desizing process; when desizing, the concentration of the desizing enzyme is 12 g/L and the concentration of the penetrant is 8 g/L; the temperature of the size vat is set at 70° C., the temperature of the washing tank is set at 65° C., the temperature of the drying drum is set at 110° C., the rolling pressure is set at 0.35 Mpa, the desizing speed is controlled at 65 m/min for desizing, and the falling-cloth humidity is controlled at 4%;
A pre-shrinking machine is used to perform a pre-shrinking process, wherein the speed is 30 m/min, the compression degree of the rubber blanket is 18%, the temperature of the rubber blanket is 140° C., and the temperature of blanket drying drum is 140° C.
After the performances of fabric 1 and fabric 2 are tested, the test results are shown in table 1.
The standard of the elasticity test consists of testing the tensile elastic properties of woven fabrics, such as elastic elongation, elastic resilience and growth rate (namely, plastic deformation) according to the standard FZ/T 01034-2008 “Test Method for Tensile Elasticity of Woven Fabrics”.
The standard of the shrinkage test is based on the standard AATCC 135-2015 “Variation of Fabric Size in Home Launder”.
The width test is performed by measuring the cloth size with a ruler.
Among them, the width of the finished fabric 1 accounts for 75% of the width of the grey fabric, and the width of the finished fabric 2 accounts for 85.94% of the width of the grey fabric.
Through comparison, it can be seen that the shrinkage rate of the fabric woven with the composite yarn of the present invention is well controlled, the width of the finished fabric is large, and the production efficiency is significantly improved.
The weft shrinkage refers to the shrinkage rate of the finished fabric. The shrinkage rate of the finished fabric 1 is −13% while that of the finished fabric 2 is −3%, which proves that the size stability of fabric 2 is much higher. Meanwhile, the elastic elongation and the elastic resilience of fabric 2 are high, and the growth rate is small. Therefore, after a prolonged period of stretching, the resilience of fabric 2 is good, and the probability of plastic deformation is low.
Through unaided eye observation, fabric 1 has no retro effect, its twill sense is weak and its wrinkle effect is poor, while fabric 2 has an ideal retro style, its twill sense is strong and its texture is clear.
Embodiment 2The warp yarn is interwoven with cotton and tencel, the counts of yarn is 16S, and the weft yarn B1 is a 21S+105D core yarn, wherein the drafting ratio of the spandex is 3.5 times, and the warp yarn is interwoven with the weft yarn B1 to form a fabric 3. The weft yarn B2 adopts a 21S pure cotton yarn spirally wrapping a 105D spandex, wherein the drafting ratio of the spandex is 1.5 times, and the warp yarn is interwoven with the weft yarn B2 to form a fabric 4. Fabric 3 and fabric 4 are 3/1 twill structures.
Fabric 3 and the fabric 4 are processed by the same conventional post-finishing process in embodiment 1.
After the performances of fabric 3 and fabric 4 are tested, the test results are shown in table 2.
Among them, the width of the finished fabric 3 accounts for 68.57% of the width of the grey fabric, and the width of the finished fabric 4 accounts for 84.85% of the width of the grey fabric.
Through comparison, it can be seen that the shrinkage rate of the fabric woven in the composite yarn of the present invention is well controlled. The width of the finished fabric is relative large, and the production efficiency is significantly improved.
The weft shrinkage refers to the shrinkage rate of the finished fabric. The shrinkage rate of the finished fabric 3 is −15% while that of the finished fabric 4 is −3%, which proves that the size stability of fabric 4 is much higher. Meanwhile, the elastic elongation and the elastic resilience of fabric 4 are large, and the growth rate is small. Therefore, after a prolonged period of stretching, the resilience of fabric 2 is good, and the probability of plastic deformation is low.
Through unaided eye observation, fabric 3 has no retro effect, its twill sense is weak and its wrinkle effect is poor, while fabric 4 has an ideal retro style, its twill sense is strong and its texture is clear.
It should be understood that the scope of the present invention is not limited to the embodiments described above. For those skilled in the art, various improvements and modifications may be made without departing from the principles of the present invention. Therefore, these improvements and modifications shall also fall into the scope of the present disclosure.
Claims
1. A composite yarn, comprising:
- a core yarn, and
- an outer wrapping yarn, wherein the core yarn further comprising at least one piece of elastic filament, and wherein the outer wrapping yarn is made of short fiber, wherein the outer wrapping yarn is spirally wrapped around the core yarn, and the drafting ratio of the corn yarn is 1-1.5 times.
2. The composite yarn of claim 1, wherein the twisting degree of the outer wrapping yarn is 8.48-36 twists/inch, and wherein length of the outer wrapping yarn is more than 1.5 times that of the core yarn.
3. The composite yarn of claim 1, wherein number of winding turns of the outer wrapping yarn on the core yarn is greater than 15 per 1 cm.
4. The composite yarn of claim 1, wherein number of winding turns of the outer wrapping yarn on the core yarn is 15-40 per 1 cm.
5. The composite yarn of claim 1, wherein counts of the outer wrapping yarn are 10-80S, and denier of the core yarn is 20D-500D.
6. The composite yarn of claim 1, wherein the short fiber is a fiber having a length ranging from 10-90 mm, and wherein the short fiber is a natural fiber or a chemical fiber.
7. The composite yarn of claim 1, wherein the short fiber is a cotton fiber, a tencel fiber, a modal fiber, a polyester fiber or a nylon fiber.
8. The composite yarn of claim 1, wherein the short fiber is a cotton fiber.
9. A preparation method of the composite yarn of claim 1, comprising the steps of:
- Processing short fiber into a rough yarn, and processing rough yarn into an outer wrapping yarn through a spinning process;
- Placing a corn-yarn spool on a feeding roller, drawing the core yarn into a hollow spindle through a pre-drafting roller, and imposing a drafting force having a drafting ratio of 1-1.5 times on the core yarn by the pre-drafting roller;
- Feeding the core yarn into the hollow spindle, making the core yarn pass through the center of the hollow spindle, and leading out the outer wrapping yarn along with the rotation of the hollow spindle, thus making the outer wrapping yarn wrap on the hollow spindle; through an air-ring guiding hook, a yarn-guiding roller and a pressing roller, winding to obtain a finished composite yarn, wherein during the wrapping process, the twisting degree of the outer wrapping yarn is 900-1500 twists/m.
10. An elastic fabric, comprising interweaving a warp yarn or a weft yarn, wherein the weft yarn is the composite yarn as described in claim 1.
Type: Application
Filed: Mar 30, 2021
Publication Date: Jun 9, 2022
Inventor: Zongwen WANG (Foshan)
Application Number: 17/216,859
