Elastomeric fiber and fabric and method of making same

Abstract

The present application relates to the technical field of textiles, and particularly relates to an elastic fiber and a fabric and a preparation method thereof. The elastic fiber comprises a skin layer and a core layer, the skin layer wraps the core layer, and the skin layer is made of PET material; the core layer is a parallel composite fiber formed by PET material and PBT material. The fabric made of the elastic fiber has high elasticity, is not easy to be damaged, and has wear resistance.

Description

Technical Field

[0001] This invention relates to the field of textile technology, specifically to an elastic fiber and fabric, and a method for preparing the same. Background Technology

[0002] With the upgrading of consumption, new requirements are being placed on the fabrics of intimate apparel and sportswear. In addition to meeting daily wear needs, fabrics must also meet multiple functional requirements. Fabrics must possess high elasticity to reduce restriction, be durable, and abrasion-resistant. Current technology typically uses polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) with different heat shrinkage rates to prepare side-by-side composite fibers. Side-by-side composite fibers are composite fibers in which the two polymer components are arranged longitudinally on both sides of the fiber, requiring a certain degree of adhesion at the interface between the two components to prevent interfacial delamination. The side-by-side composite fibers formed from PET and PBT are heat-treated to form three-dimensional helical crimped elastic fibers. Fabrics made from existing elastic fibers have high elasticity, but they are easily damaged during use and are not abrasion-resistant. Summary of the Invention

[0003] The purpose of this invention is to improve the above-mentioned defects of the fabrics in the background art to a certain extent, and to provide an elastic fiber and fabric and a method for preparing the same. The elastic fiber and fabric of this invention not only have high elasticity, but are also not easily damaged and are wear-resistant.

[0004] Through continuous observation, analysis, and experimentation, the applicant sought to understand why fabrics in the prior art are prone to damage. The applicant discovered that the elastic fibers in existing technologies are parallel composite fibers formed from PET and PBT, with PET and PBT arranged longitudinally on both sides of the fiber, forming an interface at their junction. During daily wear, clothing is frequently subjected to friction, and prolonged use can easily lead to the separation of the PET and PBT interface, resulting in fabric damage. Furthermore, PBT material has low abrasion resistance, and the PBT material of the elastic fibers is in direct contact with the external environment, making it susceptible to wear and tear over long-term use.

[0005] The aforementioned defects in the background technology were first discovered by the applicant. Based on this, and in order to improve upon the defects in the background technology and achieve the purpose of this invention, the applicant adopts the following technical solution to solve the problem: An elastic fiber comprising a sheath and a core layer, wherein the sheath wraps the core layer and the sheath is made of PET material; the core layer is a parallel composite fiber formed of PET material and PBT material.

[0006] Furthermore, the intrinsic viscosity of the PET in the sheath layer is 0.8-0.9 dL / g, the intrinsic viscosity of the PET in the core layer is 0.64-0.68 dL / g, and the intrinsic viscosity of the PBT in the core layer is 1.0-1.2 dL / g.

[0007] Furthermore, the mass ratio of the skin layer to the core layer is 1 / 95-20 / 80, and the mass ratio of PET to PBT in the core layer is 20 / 80-60 / 40.

[0008] Furthermore, the cross-section of the skin layer is annular.

[0009] Furthermore, the fineness of the elastic fiber is 0.1-0.5 dtex.

[0010] A method for preparing an elastic fiber, comprising the following steps: S1. Vacuum dry the PET slices used to prepare the skin layer at a temperature of 130-145℃ for 12-18 hours until the moisture content is less than 25 ppm; vacuum dry the PET slices used to prepare the core layer at a temperature of 130-145℃ for 12-18 hours until the moisture content is less than 25 ppm; vacuum dry the PBT slices used to prepare the core layer at a temperature of 110-130℃ for 12-18 hours until the moisture content is less than 40 ppm. S2. The PET chips for preparing the skin layer after drying in step S1 are placed into the first screw of a three-screw extruder, heated to 285-300℃ to melt, and extruded to obtain a PET skin layer spinning melt; the PET chips for preparing the core layer after drying in step S1 are placed into the second screw of a three-screw extruder, heated to 270-285℃ to melt, and extruded to obtain a PET core layer spinning melt; the PBT chips for preparing the core layer after drying in step S1 are placed into the third screw of a three-screw extruder, heated to 250-265℃ to melt, and extruded to obtain a PBT core layer spinning melt. S3. According to the preset mass ratio of the sheath to the core and the PET to PBT mass ratio of the core, the sheath PET spinning melt, the core PET spinning melt, and the core PBT spinning melt are spun using a sheath-core parallel composite spinning assembly; the spinning speed is 2000-3500m / min, the draw ratio is 2.8-3.8, the stretching temperature is 110-140℃, and the side blowing temperature is 18-25℃, to obtain the elastic fiber.

[0011] Furthermore, in step S3, the spinning temperature of the PET sheath spinning melt is 288-295°C, the spinning temperature of the PET core layer spinning melt is 270-285°C, and the spinning temperature of the PBT core layer spinning melt is 250-265°C.

[0012] A method for preparing a fabric, comprising the production of an elastic fiber as described in any of the above-mentioned processes through subsequent weaving, pretreatment, dyeing, and finishing.

[0013] Furthermore, the pretreatment temperature is 90-95°C and the time is 30-40 min; the staining temperature is 120-125°C and the time is 45-60 min; the setting temperature is 150-170°C and the setting speed is 25-30 m / min.

[0014] A fabric prepared by any of the above-described fabric preparation methods.

[0015] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects: The first technical solution involves an elastic fiber comprising a sheath and a core layer, with the sheath, made of PET, encasing the core layer. The core layer is a parallel composite fiber formed from PET and PBT materials. The sheath encapsulates the core layer, creating a binding effect and preventing separation of PET and PBT at the interface, thus improving the stability of the elastic fiber. Furthermore, the sheath is made of PET, and the core layer is composed of both PET and PBT materials. PET has higher abrasion resistance than PBT. Because the sheath encapsulates the core layer, the PET in the sheath encapsulates the PBT in the core layer. During friction with external objects, the more abrasion-resistant PET rubs against the external material, while the less abrasion-resistant PBT does not, thereby improving the abrasion resistance of the elastic fiber.

[0016] The elastic fiber of this technical solution is less prone to separation of parallel composite fibers at the interface during use, making it less susceptible to damage; and the PBT of the parallel composite fibers is also less prone to damage, thus improving the wear resistance of the elastic fiber.

[0017] The second technical solution involves a PET sheath with a higher intrinsic viscosity than the PET core layer. By encapsulating the core layer with the higher-viscosity PET, the core PET and PBT are protected, preventing separation. The higher intrinsic viscosity of PET also contributes to its superior abrasion resistance. This solution further enhances the abrasion resistance of the elastic fibers and allows the sheath to more stably encapsulate the core layer.

[0018] The third technical solution optimizes the mass ratio of the skin layer to the core layer and the mass ratio of PET to PBT in the core layer, thereby improving the wear resistance of the skin layer without overly restricting the core layer, achieving a synergy between elasticity and wear resistance.

[0019] The fourth technical solution involves a circular cross-section for the skin layer, providing uniform protection to the core layer in all directions. Furthermore, the surface in contact with the skin is a smooth curved surface, enhancing comfort during contact.

[0020] The fifth technical solution involves preparing elastic fibers with a fineness of 0.1-0.5 dtex. Due to the sheath layer enveloping the core layer, even with a fineness of 0.1-0.5 dtex, the elastic fibers are less prone to interfacial separation of the PET and PBT core layers, preventing fuzzing and reducing wear and deformation during use. Fabrics made from elastic fibers of this fineness solve the problems of traditional fabrics made from lower-fineness fibers, such as lack of elasticity, easy wrinkling, and a restrictive feel. Furthermore, the low fineness significantly reduces the fiber's bending stiffness, resulting in a delicate and soft feel against the skin, improving fabric comfort. The low-fineness elastic fibers can form abundant capillary moisture-wicking channels within the fabric, which, combined with the crimped structure, create three-dimensional breathable pores, enhancing the fabric's moisture-wicking and quick-drying properties and improving comfort.

[0021] The sixth technical solution involves drying and melting PET for the outer layer, PET for the core layer, and PBT for the core layer, and then using a sheath-core parallel composite spinning assembly to produce elastic fibers, thus giving the elastic fibers both elasticity and abrasion resistance.

[0022] The seventh technical solution further optimizes the spinning temperature, the combination of PET and PBT in the core layer, and the combination of the sheath and the core layer, thereby further improving the comfort, elasticity, and abrasion resistance of the elastic fiber.

[0023] The eighth technical solution is a method for preparing a fabric, wherein any one of the above-mentioned elastic fibers is made by subsequent weaving, pretreatment, dyeing and setting, and the resulting fabric has high elasticity, durability and abrasion resistance.

[0024] The ninth technical solution improves the elasticity, durability, and abrasion resistance of the fabric by further defining the pretreatment, dyeing, and setting processes.

[0025] The tenth technical solution is that the fabric prepared by the above method has high elasticity, abrasion resistance, and is not easily damaged. When prepared using low-density elastic fibers, it can also have a delicate and soft skin-friendly feel and moisture-wicking and quick-drying properties. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the cross-section of an elastic fiber.

[0028] Explanation of key reference numerals: 1. Sheet layer; 2. Core layer; 21. Core layer PET; 22. Core layer PBT. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.

[0031] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.

[0032] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.

[0033] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0034] See Figure 1The elastic fiber comprises a sheath 1 and a core 2, with the sheath 1 encasing the core 2. The sheath 1 has a circular cross-section and is made of PET. The core 2 is a parallel composite fiber formed by core PET 21 and core PBT 22. The intrinsic viscosity of the PET in the sheath 1 is 0.8-0.9 dL / g, the intrinsic viscosity of the PET in the core 2 is 0.64-0.68 dL / g, and the intrinsic viscosity of the PBT in the core 2 is 1.0-1.2 dL / g. The mass ratio of the sheath 1 to the core 2 is 1 / 95-20 / 80, and the mass ratio of the PET to the PBT in the core is 20 / 80-60 / 40. The fineness of the elastic fiber is 0.1-0.5 dtex. The elastic fiber is elastic, durable, and abrasion-resistant.

[0035] A fabric is made from the aforementioned elastic fibers through subsequent weaving, pretreatment, dyeing, and finishing processes. The fabric is highly elastic, durable, abrasion-resistant, and comfortable.

[0036] Example 1 A method for preparing a fabric includes the following steps: S1. A skin layer is prepared using PET chips with an intrinsic viscosity of 0.82 dL / g. The PET chips used to prepare the skin layer are then subjected to vacuum drum drying at 135°C for 12 hours until the moisture content is less than 25 ppm. A core layer is prepared using PET chips with an intrinsic viscosity of 0.65 dL / g. The PET chips used to prepare the core layer are then subjected to vacuum drum drying at 135°C for 12 hours until the moisture content is less than 25 ppm. A core layer is prepared using PBT chips with an intrinsic viscosity of 1.1 dL / g. The PBT chips used to prepare the core layer are then subjected to vacuum drum drying at 120°C for 14 hours until the moisture content is less than 40 ppm. S2. The PET chips for preparing the skin layer after drying in step S1 are placed into the first screw of a three-screw extruder and melt-extruded at a temperature of 290°C to obtain a PET skin layer spinning melt; the PET chips for preparing the core layer after drying in step S1 are placed into the second screw of a three-screw extruder and melt-extruded at a temperature of 278°C to obtain a PET core layer spinning melt; the PBT chips for preparing the core layer after drying in step S1 are placed into the third screw of a three-screw extruder and melt-extruded at a temperature of 260°C to obtain a PBT core layer spinning melt. S3. The mass ratio of the sheath spinning melt to the core spinning melt is 5:95, and the mass ratio of the core PET spinning melt to the core PBT spinning melt is 40:60. The sheath PET spinning melt, core PET spinning melt, and core PBT spinning melt are metered by their respective pumps and then fed into the composite spinning box, where they are spun using a sheath-core parallel composite spinning assembly. The elastic fiber specification is 50D / 144F. The spinning temperature of the sheath PET spinning melt is 290℃, the spinning temperature of the core PET spinning melt is 278℃, and the spinning temperature of the core PBT spinning melt is 260℃; the spinning speed is 2500 m / min, the draw ratio is 3.2, the stretching temperature is 125℃, and the side-blowing temperature is 20℃; thus, elastic fibers are obtained.

[0037] S4. The elastic fibers are processed through subsequent weaving, pretreatment (90°C, 30min, 2g / L degreasing agent), dyeing (125°C, 60min, 2-3% owf disperse dye), and setting (150°C, 25m / min) to obtain the fabric.

[0038] Example 2 A method for preparing a fabric includes the following steps: S1. A skin layer is prepared using PET chips with an intrinsic viscosity of 0.82 dL / g. The PET chips used to prepare the skin layer are then subjected to vacuum drum drying at 135°C for 12 hours until the moisture content is less than 25 ppm. A core layer is prepared using PET chips with an intrinsic viscosity of 0.65 dL / g. The PET chips used to prepare the core layer are then subjected to vacuum drum drying at 135°C for 12 hours until the moisture content is less than 25 ppm. A core layer is prepared using PBT chips with an intrinsic viscosity of 1.1 dL / g. The PBT chips used to prepare the core layer are then subjected to vacuum drum drying at 120°C for 14 hours until the moisture content is less than 40 ppm. S2. The PET chips for preparing the skin layer after drying in step S1 are placed into the first screw of a three-screw extruder and melt-extruded at a temperature of 290°C to obtain a PET skin layer spinning melt. The PET chips for preparing the core layer after drying in step S1 are placed into the second screw of a three-screw extruder and melt-extruded at a temperature of 278°C to obtain a PET core layer spinning melt. The PBT chips for preparing the core layer after drying in step S1 are placed into the third screw of a three-screw extruder and melt-extruded at a temperature of 260°C to obtain a PBT core layer spinning melt. S3. The mass ratio of the sheath spinning melt to the core spinning melt is 15:85, and the mass ratio of the core PET spinning melt to the core PBT spinning melt is 40:60. The sheath PET spinning melt, core PET spinning melt, and core PBT spinning melt are metered by their respective pumps and then fed into the composite spinning box, where they are spun using a sheath-core parallel composite spinning assembly. The elastic fiber specification is 50D / 144F. The spinning temperature of the sheath PET spinning melt is 290℃, the spinning temperature of the core PET spinning melt is 278℃, and the spinning temperature of the core PBT spinning melt is 260℃; the spinning speed is 2500 m / min, the draw ratio is 3.2, the stretching temperature is 125℃, and the side-blowing temperature is 20℃; thus, elastic fibers are obtained.

[0039] S4. The elastic fibers are processed through subsequent weaving, pretreatment (90°C, 30min, 2g / L degreasing agent), dyeing (125°C, 60min, 2-3% owf disperse dye), and setting (150°C, 25m / min) to obtain the fabric.

[0040] Example 3 A method for preparing a fabric includes the following steps: S1. A skin layer is prepared using PET chips with an intrinsic viscosity of 0.82 dL / g. The PET chips used to prepare the skin layer are then subjected to vacuum drum drying at 135°C for 12 hours until the moisture content is less than 25 ppm. A core layer is prepared using PET chips with an intrinsic viscosity of 0.65 dL / g. The PET chips used to prepare the core layer are then subjected to vacuum drum drying at 135°C for 12 hours until the moisture content is less than 25 ppm. A core layer is prepared using PBT chips with an intrinsic viscosity of 1.1 dL / g. The PBT chips used to prepare the core layer are then subjected to vacuum drum drying at 120°C for 14 hours until the moisture content is less than 40 ppm. S2. The PET chips for preparing the skin layer after drying in step S1 are placed into the first screw of a three-screw extruder and melt-extruded at a temperature of 290°C to obtain a PET skin layer spinning melt. The PET chips for preparing the core layer after drying in step S1 are placed into the second screw of a three-screw extruder and melt-extruded at a temperature of 278°C to obtain a PET core layer spinning melt. The PBT chips for preparing the core layer after drying in step S1 are placed into the third screw of a three-screw extruder and melt-extruded at a temperature of 260°C to obtain a PBT core layer spinning melt. S3. The mass ratio of the sheath spinning melt to the core spinning melt is 5:95, and the mass ratio of the core PET spinning melt to the core PBT spinning melt is 60:40. The sheath PET spinning melt, core PET spinning melt, and core PBT spinning melt are metered by their respective pumps and then fed into the composite spinning box, where they are spun using a sheath-core parallel composite spinning assembly. The elastic fiber specification is 50D / 144F. The spinning temperature of the sheath PET spinning melt is 290℃, the spinning temperature of the core PET spinning melt is 278℃, and the spinning temperature of the core PBT spinning melt is 260℃; the spinning speed is 2500 m / min, the draw ratio is 3.2, the stretching temperature is 125℃, and the side-blowing temperature is 20℃; thus, elastic fibers are obtained.

[0041] S4. The elastic fibers are processed through subsequent weaving, pretreatment (90°C, 30min, 2g / L degreasing agent), dyeing (125°C, 60min, 2-3% owf disperse dye), and setting (150°C, 25m / min) to obtain the fabric.

[0042] Comparative Example A method for preparing a fabric includes the following steps: S1. Use PET chips with an intrinsic viscosity of 0.65 dL / g; perform vacuum drum drying on the PET chips at a temperature of 135℃ for 12 hours until the moisture content is less than 25 ppm; use PBT chips with an intrinsic viscosity of 1.1 dL / g; perform vacuum drum drying on the PBT chips at a temperature of 120℃ for 14 hours until the moisture content is less than 40 ppm. S2. The PET chips dried in step S1 are placed into the first screw of a twin-screw extruder and melt-extruded at a temperature of 278°C to obtain PET spinning melt; the PBT chips dried in step S1 are placed into the second screw of a twin-screw extruder and melt-extruded at a temperature of 260°C to obtain PBT spinning melt. S3. Using a PET spinning melt to PBT spinning melt mass ratio of 40:60, the PET and PBT spinning melts are fed into a composite spinning box after being metered by their respective metering pumps, and then spun through parallel composite spinning components. The elastic fiber specifications are 50D / 144F. The spinning temperature of the PET spinning melt is 278℃, and the spinning temperature of the PBT spinning melt is 260℃; the spinning speed is 2500m / min, the draw ratio is 3.2, the stretching temperature is 125℃, and the side-blowing temperature is 20℃; thus, elastic fibers are obtained.

[0043] S4. The elastic fibers are processed through subsequent weaving, pretreatment (90°C, 30min, 2g / L degreasing agent), dyeing (125°C, 60min, 2-3% owf disperse dye), and setting (150°C, 25m / min) to obtain the fabric.

[0044] The wear resistance and elastic recovery rate of Examples 1, 2, and 3, along with the comparative example, were tested. The test results are as follows:

[0045] Abrasion resistance test: GB / T 21196.1 Textiles - Martindale method for determination of abrasion resistance of fabrics Elasticity test: 《FZ / T 70006—2022 Test method for tensile elastic recovery rate of knitted fabrics》 The fabric's smoothness and feel test is a subjective evaluation. o - optimal, O~△ - good; x - bad The test results above show that the abrasion resistance of Examples 1, 2, and 3 is higher than that of the comparative example. Furthermore, by adjusting the mass ratio of the sheath to the core layer and the mass ratio of PET to PBT in the core layer, the elastic fiber can simultaneously possess high elasticity, high abrasion resistance, and high comfort.

[0046] In this embodiment, the elastic fiber includes a sheath and a core layer, with the sheath wrapping around the core layer. The sheath is made of PET. The core layer is a parallel composite fiber formed of PET and PBT materials. The sheath wrapping around the core layer provides a binding effect, preventing the PET and PBT from separating at the interface and improving the stability of the elastic fiber. Furthermore, the sheath is made of PET, and the core layer is made of both PET and PBT materials. PET has higher abrasion resistance than PBT. Because the sheath wraps around the core layer, the PET in the sheath wraps around the PBT in the core layer. During friction with the external environment, the more abrasion-resistant PET rubs against the external material, while the less abrasion-resistant PBT does not, thus improving the abrasion resistance of the elastic fiber.

[0047] In this embodiment, the elastic fiber is less prone to separation of the parallel composite fibers at the interface during use, making it less susceptible to damage; and the PBT of the parallel composite fibers is also less prone to damage, thus improving the wear resistance of the elastic fiber.

[0048] In this embodiment, the intrinsic viscosity of the PET sheath is greater than that of the PET core layer. By wrapping the core layer with the higher-viscosity PET, the core PET and PBT are protected, preventing them from separating. Furthermore, the higher the intrinsic viscosity of the PET, the higher its abrasion resistance. This embodiment further improves the abrasion resistance of the elastic fibers and allows the sheath to more stably wrap the core layer.

[0049] In this embodiment, by optimizing the mass ratio of the skin layer to the core layer and the mass ratio of PET to PBT in the core layer, the wear resistance of the skin layer is improved without excessively constraining the core layer, thus achieving a synergy between elasticity and wear resistance.

[0050] In this embodiment, the cross-section of the skin layer is annular, providing uniform protection to the core layer in all directions. Furthermore, the surface in contact with the skin is a smooth curved surface, improving comfort during contact.

[0051] In this embodiment, the elastic fiber fineness is 0.1-0.5 dtex. Due to the sheath wrapping the core layer, even with a fineness of 0.1-0.5 dtex, the elastic fiber is less prone to interfacial separation of the PET and PBT core layers, resulting in fuzzing and making it less susceptible to wear and deformation during use. Fabrics made from elastic fibers of this fineness solve the problems of traditional fabrics made from lower-fineness fibers, such as lack of elasticity, easy wrinkling, and strong restrictive feeling. Furthermore, the low fineness significantly reduces the fiber's bending stiffness, giving the fabric a delicate and soft skin-friendly feel, improving comfort. The low-fineness elastic fibers can form abundant capillary moisture-wicking channels in the fabric, which, combined with the crimped structure, form three-dimensional breathable pores, improving the fabric's moisture-wicking and quick-drying properties and enhancing comfort.

[0052] In this embodiment, elastic fibers are obtained by drying and melting PET for the outer layer, PET for the core layer, and PBT for the core layer, and then using a sheath-core parallel composite spinning assembly, so that the elastic fibers have both elasticity and abrasion resistance.

[0053] In this embodiment, by further optimizing the spinning temperature, the combination of PET and PBT in the core layer, and the combination of the sheath and the core layer, the comfort, elasticity, and abrasion resistance of the elastic fiber are further improved.

[0054] In this embodiment, a method for preparing a fabric involves processing any one of the above-mentioned elastic fibers through subsequent weaving, pretreatment, dyeing, and setting, resulting in a fabric with high elasticity, durability, and abrasion resistance.

[0055] In this embodiment, the fabric prepared by the above method has high elasticity, abrasion resistance, and is not easily damaged. When prepared using low-density elastic fibers, it can also have a delicate and soft skin-friendly feel and moisture-wicking and quick-drying properties.

[0056] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.

Claims

1. An elastic fiber, characterized in that, The elastic fiber includes a sheath and a core layer, the sheath wraps the core layer, and the sheath is made of PET material; the core layer is a parallel composite fiber formed of PET material and PBT material.

2. The elastic fiber as described in claim 1, characterized in that, The intrinsic viscosity of the PET in the outer layer is 0.8-0.9 dL / g, the intrinsic viscosity of the PET in the core layer is 0.64-0.68 dL / g, and the intrinsic viscosity of the PBT in the core layer is 1.0-1.2 dL / g.

3. The elastic fiber as described in claim 2, characterized in that, The mass ratio of the sheath to the core layer is 1 / 95-20 / 80, and the mass ratio of PET to PBT in the core layer is 20 / 80-60 / 40.

4. The elastic fiber as described in claim 3, characterized in that, The cross-section of the skin layer is circular.

5. The elastic fiber as described in claim 4, characterized in that, The elastic fiber has a fineness of 0.1-0.5 dtex.

6. A method for preparing an elastic fiber, used to prepare the elastic fiber according to any one of claims 1 to 5, characterized in that, Includes the following steps: S1. Vacuum dry the PET slices used to prepare the skin layer at a temperature of 130-145℃ for 12-18 hours until the moisture content is less than 25 ppm; vacuum dry the PET slices used to prepare the core layer at a temperature of 130-145℃ for 12-18 hours until the moisture content is less than 25 ppm; vacuum dry the PBT slices used to prepare the core layer at a temperature of 110-130℃ for 12-18 hours until the moisture content is less than 40 ppm. S2. The PET chips for preparing the skin layer after drying in step S1 are placed into the first screw of a three-screw extruder, heated to 285-300℃ to melt, and extruded to obtain a PET skin layer spinning melt; the PET chips for preparing the core layer after drying in step S1 are placed into the second screw of a three-screw extruder, heated to 270-285℃ to melt, and extruded to obtain a PET core layer spinning melt; the PBT chips for preparing the core layer after drying in step S1 are placed into the third screw of a three-screw extruder, heated to 250-265℃ to melt, and extruded to obtain a PBT core layer spinning melt. S3. According to the preset mass ratio of the sheath to the core and the PET to PBT mass ratio of the core, the sheath PET spinning melt, the core PET spinning melt, and the core PBT spinning melt are spun using a sheath-core parallel composite spinning assembly; the spinning speed is 2000-3500m / min, the draw ratio is 2.8-3.8, the stretching temperature is 110-140℃, and the side blowing temperature is 18-25℃, to obtain the elastic fiber.

7. The method for preparing an elastic fiber as described in claim 6, characterized in that, In step S3, the spinning temperature of the PET sheath spinning melt is 288-295℃, the spinning temperature of the PET core layer spinning melt is 270-285℃, and the spinning temperature of the PBT core layer spinning melt is 250-265℃.

8. A method for preparing a fabric, characterized in that, It is made by means of any one of claims 1 to 5 of an elastic fiber through subsequent weaving, pretreatment, dyeing and setting.

9. The method for preparing a fabric as described in claim 8, characterized in that, The pretreatment temperature is 90-95°C and the time is 30-40 min; the staining temperature is 120-125°C and the time is 45-60 min; the setting temperature is 150-170°C and the setting speed is 25-30 m / min.

10. A fabric characterized in that, It is prepared by the method of any one of claims 8-9.

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