A functional fabric

Abstract

This invention discloses a functional fabric comprising warp and weft yarns. The warp yarn density is greater than or equal to 100 threads / cm, and the weft yarn density is greater than or equal to 90 threads / cm. Both the warp and weft yarns include a first fiber and a second fiber. The first fiber has a core and a plurality of teeth spaced apart in the circumferential direction of the core. The length of the side of each tooth away from the core is greater than the distance between the two sides of two adjacent teeth away from the core. The teeth are made of functional polyamide, and the core is made of functional polyamide and / or polyamide. This functional fabric increases the contact area between ultraviolet light and the first fiber, improving the absorption and reflection of ultraviolet light by the first fiber, thereby increasing the utilization efficiency of the UV-resistant additives. Furthermore, it fills the gaps created by the dissolution of the shell of the nascent fiber, preventing ultraviolet light from penetrating the functional fabric and ensuring its UV resistance.

Description

[0001] This application is a divisional application of the invention patent application filed on December 26, 2023, with application number 202311798207.3 and invention title "A functional fabric and its preparation method". Technical Field

[0002] This invention relates to the field of textile technology, and more specifically to a functional fabric. Background Technology

[0003] Existing profiled fibers with improved UV resistance are produced by spinning a spinning solution containing UV-resistant agents using a profiled spinneret, resulting in a uniform distribution of the UV-resistant agent across the entire fiber. Chinese invention patent CN110257950, entitled "A Method for Preparing UV-Resistant Modified Profiled Nylon Filament," discloses a novel UV-resistant fiber processing method. However, to avoid affecting weaving, this method limits the amount of UV-resistant agent that can be added, thus restricting its UV resistance performance.

[0004] How to ensure good fiber weaving performance while also giving it good UV resistance is an urgent problem to be solved. Summary of the Invention

[0005] In view of this, in order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a functional fabric that can be prepared with good UV resistance without affecting the weaving performance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] One object of the present invention is to provide a method for preparing a functional fabric, comprising the following steps:

[0008] Step 1: Mix water-soluble polyester and functional masterbatch and then spin to obtain nascent fibers;

[0009] The nascent fiber includes a core, a shell, and teeth, with the teeth located between the shell and the core and spaced apart in the circumferential direction of the core; the water-soluble polyester is used to form the shell, and the functional masterbatch is used to form the core and teeth;

[0010] Step 2: Blend the nascent fibers with functional fibers to obtain yarn; before blending the nascent fibers with functional fibers, first treat the nascent fibers by oiling, stretching and setting.

[0011] Step 3: Prepare sample fabric from the yarn;

[0012] Step 4: Dissolve the shell portion of the nascent fibers and swell the functional fibers in the sample fabric, then perform post-processing to obtain the functional fabric.

[0013] By preparing nascent fibers and blending them with functional fibers to form yarns, and then using these yarns as warp and weft yarns respectively to obtain sample fabrics through warp and weft interlacing, the shell portion of the nascent fibers (i.e., water-soluble polyester) is dissolved using an alkali solution. This process helps reduce the weight of the fabric, increases the contact area between ultraviolet rays and the fibers, and improves the absorption and reflection of ultraviolet rays by the fibers, thereby improving the utilization efficiency of the anti-ultraviolet additives. At the same time, the functional fibers in the nascent fibers swell, increasing their volume and filling the gaps created by the dissolution of the shell portion of the nascent fibers, thus preventing ultraviolet rays from penetrating the fabric and ensuring the fabric's anti-ultraviolet performance. In addition, the shell portion of the nascent fibers is made of soluble polyester, meaning that the contact surface where friction occurs during weaving is made of soluble polyester material, which has good abrasion resistance and helps improve the weaveability of the yarn.

[0014] According to some preferred embodiments of the invention, the length of the side of each tooth away from the core is greater than the distance between the two sides of two adjacent teeth away from the core. This arrangement ensures that adjacent nascent fibers in the fabric do not interlock after the shell of the nascent fibers is dissolved, thereby ensuring the breathability of the fabric.

[0015] According to some preferred embodiments of the invention, the shell portion includes a shell body and an extension portion, the extension portion being embedded in the gap between two adjacent teeth. In some embodiments of the invention, the core portion is cylindrical, the shell body and the core portion have their axes coincident, and each tooth portion is a quadrangular prism. Furthermore, the shell portion is made of soluble polyester, which has a certain degree of abrasion resistance, and during the weaving of the sample fabric, even if both the warp and weft yarns contain a certain amount of functional powder, it will not affect the weaving performance of the yarn.

[0016] According to some preferred embodiments of the present invention, the core includes an outer core and an inner core, the outer core and the inner core having the same axis, and the outer core being sleeved on the outer periphery of the inner core.

[0017] According to some preferred embodiments of the present invention, in step 2, the nascent fibers and functional fibers are blended at a blending ratio of 1 to 3:1.

[0018] According to some preferred embodiments of the present invention, the functional fiber is a cellulose fiber. In some embodiments of the present invention, the cellulose fiber is preferably cotton fiber, hemp fiber, or chitosan fiber; in other embodiments, other types of cellulose fibers may also be used, all provided that the functional fiber can be swollen by the alkali solution.

[0019] According to some preferred embodiments of the present invention, the method for dissolving the shell portion of the nascent fibers and swelling the functional fibers in the sample fabric is as follows: the sample fabric is immersed in an alkaline solution at a temperature of 80–100°C and a pH of 7–8.5 for 40–60 minutes and then removed; the alkaline substance contained in the alkaline solution is a metal hydroxide or an amine. The alkaline solution is used on the one hand to dissolve the water-soluble polyester, and on the other hand to increase the volume of the functional fibers after swelling. During the preparation process, after the sample fabric is immersed in the alkaline solution, the shell portion of the nascent fibers is removed, exposing multiple teeth. The spaced teeth and the core portion exposed from the gaps between adjacent teeth are beneficial for increasing the absorption and reflection of ultraviolet rays, ultimately improving the UV resistance of the fabric.

[0020] According to some preferred embodiments of the present invention, the functional masterbatch comprises a functional polyamide masterbatch; or, the functional masterbatch comprises a functional polyamide masterbatch and a polyamide masterbatch.

[0021] According to some preferred embodiments of the present invention, the nascent fiber is prepared by the following method: dried water-soluble polyester and functional polyamide masterbatch with a volume ratio of 1:1.5-4 are placed in a spinning box, melt-extruded, and then spun through a spinneret to obtain the nascent fiber. Specifically, dried water-soluble polyester and functional polyamide masterbatch with a volume ratio of 1:1.5-4 are placed in a spinning box, melt-extruded, filtered, and metered to obtain a melt of water-soluble polyester and a melt of UV-resistant polyamide masterbatch. The melts of water-soluble polyester and UV-resistant polyamide masterbatch are then placed into corresponding feed hoppers in the spinning box, allowing the melts of the two polymers to pass through filters and distribution plates in the spinning box according to their respective paths, and then be spun through a spinneret, cooled, and solidified to obtain the nascent fiber.

[0022] According to some preferred embodiments of the present invention, the nascent fiber is prepared by the following method: dried water-soluble polyester, functional polyamide masterbatch, and polyamide masterbatch in a volume ratio of 1:0.5 to 1:1 to 3 are placed in a spinning box, melt-extruded, and then spun through a spinneret to obtain the nascent fiber. Specifically, dried water-soluble polyester, functional polyamide masterbatch, and polyamide masterbatch in a volume ratio of 1:0.5 to 1:1 to 3 are placed in a spinning box, melt-extruded, filtered, and metered to obtain melts of water-soluble polyester, functional polyamide masterbatch, and polyamide masterbatch. These melts are then placed into corresponding feed hoppers in the spinning box, allowing the three polymer melts to pass through filters and distribution plates in the spinning box according to their respective paths, and then be spun through a spinneret, cooled, and solidified to obtain the nascent fiber.

[0023] According to some preferred embodiments of the present invention, the spinneret has a first aperture for forming the core portion, a second aperture for forming the teeth portion, and a third aperture for forming the shell portion, wherein the second apertures are spaced apart circumferentially from the first apertures. In some embodiments of the present invention, the first aperture is circular, the second aperture is quadrilateral, and the center of the first aperture coincides with the center of the third aperture. The first, second, and third apertures on the spinneret are provided to obtain nascent fibers having the shapes described above.

[0024] According to some preferred embodiments of the present invention, each second hole includes a first side near the third hole and a second side away from the third hole, the length of the first side being greater than the length of the second side, and the distance between the two first sides of two adjacent second holes being less than the length of the first side.

[0025] According to some preferred embodiments of the present invention, the first hole portion includes an outer hole portion for forming the outer core portion and an inner hole portion for forming the inner core portion, wherein the outer hole portion and the inner hole portion have the same center and the outer hole portion is located on the outer periphery of the inner hole portion.

[0026] In some embodiments of the present invention, a notch may be provided between the first and second holes of the spinneret to allow the second hole to communicate with the first hole; or no notch may be provided, thus separating the second hole from the first hole. When a notch is provided between the first and second holes, the core formed by the first hole and the teeth formed by the second hole are made of the same material, namely, functional polyamide; and when the first hole is configured as an outer hole and an inner hole, the outer core formed by the outer hole and the teeth formed by the second hole are made of the same material, namely, functional polyamide, while the inner core formed by the inner hole and the teeth formed by the second hole may be made of the same or different materials, i.e., the teeth and the outer core are both made of functional polyamide, and the inner core is made of functional polyamide or polyamide.

[0027] When there is no gap between the first hole and the second hole, the core formed by the first hole and the teeth formed by the second hole can be made of the same or different materials, but the teeth can be made of functional polyamide, and the core can be made of either functional polyamide or polyamide.

[0028] According to some preferred embodiments of the present invention, the functional polyamide masterbatch is prepared by the following method: polyamide chips are pulverized and sieved to obtain polyamide powder; the polyamide powder is then blended with functional powder and granulated to obtain the functional polyamide masterbatch, wherein the mass percentage of functional powder in the functional polyamide masterbatch is 0.1% to 10%. The polyamide masterbatch is obtained by granulating polyamide powder. In some embodiments of the present invention, the polyamide chips are polyamide 6 chips; the functional powder is an anti-UV powder.

[0029] Specifically, the UV-resistant powder is one or more of titanium dioxide, zinc oxide, silicon dioxide, or pearl powder.

[0030] Another object of the present invention is to provide a functional fabric prepared by the preparation method described above. The functional fabric includes warp yarns and weft yarns, each comprising a first fiber and a second fiber. The first fiber has a core and a plurality of teeth spaced apart in the circumferential direction of the core. The teeth are made of functional polyamide, and the core is made of functional polyamide and / or polyamide. The second fiber is the functional fiber. The warp density of the functional fabric is greater than or equal to 100 yarns / cm, and the weft density of the functional fabric is greater than or equal to 90 yarns / cm.

[0031] Due to the adoption of the above technical solutions, the advantages of this invention compared to existing technologies are as follows: The functional fabric of this invention, through the preparation of nascent fibers and their blending with functional fibers to obtain yarn, and then the yarn being used as warp and weft yarns respectively for warp and weft interlacing to obtain a sample fabric, utilizes an alkaline solution to dissolve the shell portion of the nascent fibers and swell the functional fibers. This helps to reduce the weight of the functional fabric, increase the contact area between ultraviolet rays and the first fiber in the functional fabric, and improve the absorption and reflection of ultraviolet rays by the first fiber, thereby improving the utilization efficiency of the anti-ultraviolet additives. Furthermore, it fills the gaps created by the dissolution of the shell portion of the nascent fibers, preventing ultraviolet rays from penetrating the functional fabric and ensuring the anti-ultraviolet performance of the functional fabric. In addition, the shell portion of the nascent fibers is abrasion-resistant soluble polyester, which helps to improve the weavability of the yarn. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the front view structure of the nascent fiber cross-section in Embodiments 2-1 and 4-1 of the present invention;

[0034] Figure 2 This is a schematic diagram of the main structure of the holes opened on the spinneret in Embodiments 2-1 and 4-1 of the present invention;

[0035] Figure 3 This is a schematic diagram of the front view of the cross-section of the first fiber in Embodiment 4-1 of the present invention;

[0036] Figure 4This is a schematic diagram of the front view structure of the nascent fiber cross-section in Embodiments 2-2 and 4-2 of the present invention;

[0037] Figure 5 This is a schematic diagram of the main structure of the holes opened on the spinneret in Embodiments 2-2 and 4-2 of the present invention;

[0038] Figure 6 This is a schematic diagram of the front view of the cross-section of the first fiber in Embodiment 4-2 of the present invention;

[0039] Figure 7 This is a schematic diagram of the front view structure of the nascent fiber cross-section in Embodiments 2-3 and 4-3 of the present invention;

[0040] Figure 8 This is a schematic diagram of the main structure of the holes opened on the spinneret in Embodiments 2-3 and 4-3 of the present invention;

[0041] Figure 9 This is a schematic diagram of the front view of the cross-section of the first fiber in Embodiments 4-3 of the present invention;

[0042] Figure 10 This is a schematic diagram of the front view structure of the nascent fiber cross-section in Embodiments 2-4 and 4-4 of the present invention;

[0043] Figure 11 This is a schematic diagram of the main structure of the holes opened on the spinneret in Embodiments 2-4 and 4-4 of the present invention;

[0044] Figure 12 This is a schematic diagram of the front view of the cross-section of the first fiber in Embodiments 4-4 of the present invention;

[0045] Figure 13 This is a schematic diagram of the main view of the holes opened on the spinneret in Comparative Example 1 of the present invention;

[0046] Figure 14 This is a schematic diagram of the front view of the cross-section of the nascent fiber in Comparative Example 1 of the present invention;

[0047] Figure 15 This is a schematic diagram of the front view of the cross-section of the first fiber in Comparative Example 1 of the present invention;

[0048] Figure 16 This is a schematic diagram of the main view of the holes opened on the spinneret in Comparative Example 3 of the present invention;

[0049] Figure 17 This is a schematic diagram of the front view of the cross-section of the nascent fiber in Comparative Example 3 of the present invention;

[0050] Figure 18This is a schematic diagram of the front view of the cross-section of the first fiber in Comparative Example 3 of the present invention;

[0051] The reference numerals in the attached drawings are as follows: first hole - 11, outer hole - 111, inner hole - 112, second hole - 12, third hole - 13, notch - 14, core - 21, outer core - 211, inner core - 212, tooth - 22, shell body - 23, extension - 24, and through-hole - 25. Detailed Implementation

[0052] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0053] Example 1: Nascent Fibers

[0054] A nascent fiber according to this embodiment includes a core 21, a shell, and a plurality of teeth 22, with the teeth 22 evenly spaced along the circumferential direction of the core 21. A water-soluble polyester is used to form the shell, and a functional masterbatch is used to form the core 21 and the teeth 22. Specifically, the shell includes a shell body 23 and an extension 24, the teeth 22 are located between the shell body 23 and the core 21, and the extension 24 is embedded in the gap between two adjacent teeth 22.

[0055] Furthermore, the length of the side of each tooth 22 away from the core 21 is greater than the distance between the two sides of two adjacent teeth 22 away from the core 21, to ensure that adjacent nascent fibers in the fabric will not interlock after the shell of the nascent fibers is dissolved, thereby ensuring the breathability of the fabric. In this embodiment, the core 21 is a complete cylinder, the shell body 23 coincides with the axis of the core 21, and each tooth 22 is a quadrangular prism; no opening 25 is provided at the connection between the teeth 22 and the core 21.

[0056] In some other embodiments of the present invention, when the core 21 is a whole, an opening 25 may be provided at the position where the tooth 22 connects to the core 21.

[0057] In other embodiments of the present invention, the core 21 of the nascent fiber may further include an outer core 211 and an inner core 212, with the outer core 211 and the inner core 212 having the same axis, and the outer core 211 being sleeved on the outer periphery of the inner core 212. In other embodiments of the present invention, when the core 21 of the nascent fiber includes both an outer core 211 and an inner core 212, an opening 25 may or may not be provided at the connection point between the toothed portion 22 and the outer core 211.

[0058] Example 2: Preparation method of nascent fibers

[0059] Example 2-1

[0060] Polyamide 6 chips were pulverized and sieved to obtain polyamide powder. The polyamide powder was then blended with titanium dioxide and granulated to obtain UV-resistant polyamide masterbatch, wherein the mass percentage of titanium dioxide in the UV-resistant polyamide masterbatch was 5%. Water-soluble polyester and UV-resistant polyamide masterbatch were pre-crystallized and dried separately. A volume ratio of 1:2 of water-soluble polyester and UV-resistant polyamide masterbatch was placed in a spinning box. After melt extrusion, filtration, and metering, the melt of water-soluble polyester and the melt of UV-resistant polyamide masterbatch entered the corresponding feed hoppers in the spinning box. The melts of the two polymers passed through the filter and distribution plate in the spinning box according to their respective paths, and then were spun by the spinneret. After cooling and solidification, nascent fibers were obtained.

[0061] The cross-sectional shape of the nascent fiber in this embodiment is as follows: Figure 1 As shown, it includes a core 21, a shell, and multiple teeth 22, with the teeth 22 evenly spaced along the circumference of the core 21. The shell includes a shell body 23 and an extension 24. The teeth 22 are located between the shell body 23 and the core 21, and the extension 24 is embedded in the gap between adjacent teeth 22. The length of the side of each tooth 22 away from the core 21 is greater than the distance between the two sides of adjacent teeth 22 away from the core 21. In this embodiment, the core 21 is a complete cylinder, the shell body 23 coincides with the axis of the core 21, and each tooth 22 is a quadrangular prism. An opening 25 is provided at the connection point between the teeth 22 and the core 21. The shell is made of water-soluble polyester, and both the teeth 22 and the core 21 are made of UV-resistant polyamide.

[0062] In this embodiment, the front view of the spinneret in the spinning box is as follows: Figure 2As shown, the spinneret has a first hole 11 for forming the nascent fiber core 21, a second hole 12 for forming the toothed portion 22, and a third hole 13 for forming the shell portion. Multiple second holes 12 are evenly spaced and arranged circumferentially around the first hole 11. Each second hole 12 includes a first side near the third hole 13 and a second side away from the third hole 13. The length of the first side is greater than the length of the second side, and the distance between the two first sides of two adjacent second holes 12 is less than the length of the first side. In this embodiment, a notch 14 is provided at the contact position between the first hole 11 and the second hole 12 of the spinneret, allowing the second hole 12 to communicate with the first hole 11.

[0063] Example 2-2

[0064] Polyamide 6 chips were pulverized and sieved to obtain polyamide powder. The polyamide powder was then blended with titanium dioxide and granulated to obtain UV-resistant polyamide masterbatch. The remaining polyamide powder was then granulated to form polyamide masterbatch. The titanium dioxide content in the UV-resistant polyamide masterbatch was 10% by mass. Water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch were pre-crystallized and dried respectively. A volume ratio of 1:0.5:1 was taken and placed into a spinning box. After melt extrusion, filtration, and metering, the melts of water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch entered the corresponding feed hoppers in the spinning box. The melts of the three polymers passed through the filter and distribution plate in the spinning box according to their respective paths, and then were spun into fibers by the spinneret. After cooling and solidification, nascent fibers were obtained.

[0065] The cross-sectional shape of the nascent fiber in this embodiment is as follows: Figure 4 As shown, it includes a core 21, a shell, and multiple teeth 22, with the teeth 22 evenly spaced around the circumference of the core 21. Each tooth 22 is a quadrangular prism. The shell includes a shell body 23 and an extension 24. The teeth 22 are located between the shell body 23 and the core 21, and the extension 24 is embedded in the gap between two adjacent teeth 22. The length of the side of each tooth 22 away from the core 21 is greater than the distance between the two sides of two adjacent teeth 22 away from the core 21. In this embodiment, the core 21 includes an outer core 211 and an inner core 212, with the outer core 211 and the inner core 212 having the same axis. The outer core 211 is fitted around the outer periphery of the inner core 212. An opening 25 is provided at the connection between the teeth 22 and the outer core 211. The shell is made of water-soluble polyester, the teeth 22 and the outer core 211 are both made of UV-resistant polyamide, and the inner core 212 is made of polyamide; and the volume ratio of the UV-resistant polyamide of the outer core 211 to the polyamide of the inner core 212 is 1:3.

[0066] In this embodiment, the front view of the spinneret in the spinning box is as follows: Figure 5 As shown, the spinneret has a first hole 11 for forming the nascent fiber core 21, a second hole 12 for forming the toothed portion 22, and a third hole 13 for forming the shell portion. Multiple second holes 12 are evenly spaced and arranged circumferentially around the first holes 11. Each second hole 12 includes a first side near the third hole 13 and a second side away from the third hole 13. The length of the first side is greater than the length of the second side, and the distance between the two first sides of two adjacent second holes 12 is less than the length of the first side.

[0067] In this embodiment, the first hole portion 11 of the spinneret includes two parts: an outer hole portion 111 for forming an outer core portion 211 of nascent fibers and an inner hole portion 112 for forming an inner core portion 212 of nascent fibers. The outer hole portion 111 and the inner hole portion 112 have the same center and the outer hole portion 111 is located on the outer periphery of the inner hole portion 112. Furthermore, a notch 14 is provided at the contact position between the outer hole portion 111 and the second hole portion 12 to allow communication between the outer hole portion 111 and the second hole portion 12.

[0068] Example 2-3

[0069] Polyamide 6 chips were pulverized and sieved to obtain polyamide powder. The polyamide powder was then blended with titanium dioxide and granulated to obtain UV-resistant polyamide masterbatch. The remaining polyamide powder was then granulated to form polyamide masterbatch. The titanium dioxide content in the UV-resistant polyamide masterbatch was 5% by mass. Water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch were pre-crystallized and dried respectively. A volume ratio of 1:0.5:1 was taken and placed into a spinning box. After melt extrusion, filtration, and metering, the melts of water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch entered the corresponding feed hoppers in the spinning box. The melts of the three polymers passed through the filter and distribution plate in the spinning box according to their respective paths, and then were spun into fibers by the spinneret. After cooling and solidification, nascent fibers were obtained.

[0070] The cross-sectional shape of the nascent fiber in this embodiment is as follows: Figure 7As shown, it includes a core 21, a shell, and multiple teeth 22, with the teeth 22 evenly spaced along the circumference of the core 21. Each tooth 22 is a quadrangular prism. The shell includes a shell body 23 and an extension 24. The teeth 22 are located between the shell body 23 and the core 21, and the extension 24 is embedded in the gap between two adjacent teeth 22. The length of the side of each tooth 22 away from the core 21 is greater than the distance between the two sides of two adjacent teeth 22 away from the core 21. In this embodiment, the core 21 is a complete cylinder, the shell body 23 coincides with the axis of the core 21, and each tooth 22 is a quadrangular prism. There is no opening 25 at the connection between the teeth 22 and the core 21. The shell is made of water-soluble polyester, the teeth 22 are made of UV-resistant polyamide, and the core 21 is made of polyamide.

[0071] In this embodiment, the front view of the spinneret in the spinning box is as follows: Figure 8 As shown, the spinneret has a first hole 11 for forming the nascent fiber core 21, a second hole 12 for forming the toothed portion 22, and a third hole 13 for forming the shell portion. Multiple second holes 12 are evenly spaced and arranged circumferentially around the first hole 11. Each second hole 12 includes a first side near the third hole 13 and a second side away from the third hole 13. The length of the first side is greater than the length of the second side, and the distance between the two first sides of two adjacent second holes 12 is less than the length of the first side. In this embodiment, no notch 14 is provided at the contact point between the first hole 11 and the second hole 12 of the spinneret, and the first hole 11 is a complete circle.

[0072] Examples 2-4

[0073] Polyamide 6 chips were pulverized and sieved to obtain polyamide powder. The polyamide powder was then blended with titanium dioxide and granulated to obtain UV-resistant polyamide masterbatch. The remaining polyamide powder was then granulated to form polyamide masterbatch. The titanium dioxide content in the UV-resistant polyamide masterbatch was 10% by mass. Water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch were pre-crystallized and dried separately. A volume ratio of 1:1:3 was then placed into a spinning box. After melt extrusion, filtration, and metering, the melts of the water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch entered the corresponding feed hoppers in the spinning box. The melts of the three polymers passed through the filters and distribution plates in the spinning box according to their respective paths, and then were spun through the spinneret. After cooling and solidification, nascent fibers were obtained.

[0074] The cross-sectional shape of the nascent fiber in this embodiment is as follows: Figure 10As shown, it includes a core 21, a shell, and multiple teeth 22, with the teeth 22 evenly spaced around the circumference of the core 21. Each tooth 22 is a quadrangular prism. The shell includes a shell body 23 and an extension 24. The teeth 22 are located between the shell body 23 and the core 21, and the extension 24 is embedded in the gap between two adjacent teeth 22. The length of the side of each tooth 22 away from the core 21 is greater than the distance between the two sides of two adjacent teeth 22 away from the core 21. In this embodiment, the core 21 includes an outer core 211 and an inner core 212, with the outer core 211 and the inner core 212 having the same axis. The outer core 211 is fitted around the outer periphery of the inner core 212. No opening 25 is provided at the connection point between the teeth 22 and the outer core 211. The shell is made of water-soluble polyester, the teeth 22 and the outer core 211 are both made of UV-resistant polyamide, and the inner core 212 is made of polyamide; and the volume ratio of the UV-resistant polyamide of the outer core 211 to the polyamide of the inner core 212 is 1:2.

[0075] In this embodiment, the front view of the spinneret in the spinning box is as follows: Figure 11 As shown, the spinneret has a first hole 11 for forming the nascent fiber core 21, a second hole 12 for forming the toothed portion 22, and a third hole 13 for forming the shell portion. Multiple second holes 12 are evenly spaced and arranged circumferentially around the first holes 11. Each second hole 12 includes a first side near the third hole 13 and a second side away from the third hole 13. The length of the first side is greater than the length of the second side, and the distance between the two first sides of two adjacent second holes 12 is less than the length of the first side.

[0076] In this embodiment, the first hole portion 11 of the spinneret includes two parts: an outer hole portion 111 for forming an outer core portion 211 of nascent fibers and an inner hole portion 112 for forming an inner core portion 212 of nascent fibers. The outer hole portion 111 and the inner hole portion 112 have the same center and the outer hole portion 111 is located on the outer periphery of the inner hole portion 112. Furthermore, no notch 14 is provided at the contact position between the outer hole portion 111 and the second hole portion 12.

[0077] Example 3 Functional Fabric

[0078] A functional fabric according to this embodiment includes warp yarns and weft yarns. The density of the warp yarns is greater than or equal to 100 threads / cm, and the density of the weft yarns is greater than or equal to 90 threads / cm. Both the warp and weft yarns include a first fiber and a second fiber. The structure of the first fiber is the same as that of the nascent fiber after the shell has dissolved. That is, the structure of the first fiber includes a core 21 and a plurality of teeth 22 evenly spaced around the core 21. The length of the side of each tooth 22 away from the core 21 is greater than the distance between the two sides of two adjacent teeth 22 away from the core 21. The core 21 is cylindrical, and each tooth 22 is quadrangular prism in shape.

[0079] In addition, the core 21 of the first fiber can be a whole; or the core 21 can be divided into two parts: an outer core 211 and an inner core 212, with the outer core 211 and the inner core 212 having the same axis, and the outer core 211 being sleeved on the outer periphery of the inner core 212.

[0080] Furthermore, when the core 21 is a whole, an opening 25 can be provided at the position where the teeth 22 of the first fiber connects with the core 21; when the core 21 includes an outer core 211 and an inner core 212, an opening 25 can also be provided at the position where the teeth 22 of the first fiber connect with the outer core 211.

[0081] In this embodiment, the teeth 22 of the first fiber in the warp and weft yarns of the functional fabric are made of functional polyamide, and the core is made of functional polyamide and / or polyamide; the second fiber is a functional fiber. In some embodiments of the present invention, the functional polyamide is UV-resistant polyamide; the functional fiber is cellulose fiber.

[0082] Example 4: Preparation method of functional fabric

[0083] Example 4-1

[0084] Step 1: Powder and sieve the polyamide 6 chips to obtain polyamide powder. Blend the polyamide powder with titanium dioxide and granulate to obtain UV-resistant polyamide masterbatch. The UV-resistant powder constitutes 5% of the mass of the UV-resistant polyamide masterbatch.

[0085] Step 2: After pre-crystallizing and drying the water-soluble polyester and UV-resistant polyamide masterbatch respectively, take water-soluble polyester and UV-resistant polyamide masterbatch with a volume ratio of 1:2 and put them into the spinning box. After melt extrusion, filtration, and metering, the melt of water-soluble polyester and the melt of UV-resistant polyamide masterbatch enter the corresponding feeding hoppers in the spinning box. The melts of the two polymers pass through the filter and distribution plate in the spinning box according to their respective paths, and then are spun by the spinneret. After cooling and solidification, the desired product is obtained. Figure 1 The nascent fibers shown are then oiled, stretched, and shaped. The spinneret in this embodiment has the following shape: Figure 2 As shown, it has the same shape as the spinneret in Example 2-1.

[0086] Step 3: Blend the nascent fiber and cotton fiber at a blending ratio of 1:1 to obtain yarn, and use this yarn as both warp and weft yarns. Warp the warp yarns onto the warp beam and thread them sequentially into the heddle wires of the corresponding heddle frames. Then, thread the warp yarns into the reed teeth according to the rule of 3 insertions per reed. Set the heddle lifting sequence on the sample loom. Introduce one weft yarn for each weft insertion, and sequentially perform shedding, weft insertion, weft insertion, crimping, and warp feeding. The warp and weft yarns are tightly interwoven to form a plain weave pattern fabric.

[0087] Step 4: Immerse the sample fabric in a sodium hydroxide aqueous solution at 100℃ and pH 8.5 for 60 minutes, then remove it to dissolve the shell in the nascent fibers and swell the cotton fibers in the sample fabric. After 60 minutes, remove the sample fabric, wash it, and dry it to obtain the UV-resistant fabric.

[0088] The warp density of this UV-resistant fabric is 100 threads / cm, and the weft density is 90 threads / cm.

[0089] In this embodiment, both the warp and weft yarns of the UV-resistant fabric include a first fiber and a second fiber, wherein the cross-sectional structure of the first fiber is as follows: Figure 3 As shown, it includes a core 21 and a plurality of teeth 22 evenly spaced around the core 21. The length of the side of each tooth 22 away from the core 21 is greater than the distance between the two sides of two adjacent teeth 22 away from the core 21. In this embodiment, the core 21 of the first fiber is a single unit and is cylindrical in shape. Each tooth 22 is quadrangular prism in shape. An opening 25 is provided at the connection between the teeth 22 of the first fiber and the core 21. In this embodiment, both the teeth 22 and the core 21 of the first fiber are made of UV-resistant polyamide.

[0090] Example 4-2

[0091] Step 1: Powder and sieve the polyamide 6 chips to obtain polyamide powder. Blend the polyamide powder with titanium dioxide and granulate to obtain UV-resistant polyamide masterbatch. Then, granulate the remaining polyamide powder to form polyamide masterbatch. The titanium dioxide content in the UV-resistant polyamide masterbatch is 10% by mass.

[0092] Step 2: After pre-crystallizing and drying the water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch respectively, take water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch in a volume ratio of 1:0.5:1 and put them into a spinning box. After melt extrusion, filtration, and metering, the melts of water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch enter the corresponding feed hoppers in the spinning box. The melts of the three polymers pass through the filter and distribution plate in the spinning box according to their respective paths, and then are spun by the spinneret. After cooling and solidification, the desired product is obtained. Figure 4 The nascent fibers shown are then oiled, stretched, and shaped. The spinneret in this embodiment has the following shape: Figure 5 As shown, it has the same shape as the spinneret in Example 2-2.

[0093] Step 3: Blend the nascent fiber and cotton fiber at a blending ratio of 1:1 to obtain yarn, and use this yarn as both warp and weft yarns. Warp the warp yarns onto the warp beam and thread them sequentially into the heddle wires of the corresponding heddle frames. Then, thread the warp yarns into the reed teeth according to the rule of 3 insertions per reed. Set the heddle lifting sequence on the sample loom. Introduce one weft yarn for each weft insertion, and sequentially perform shedding, weft insertion, weft insertion, crimping, and warp feeding. The warp and weft yarns are tightly interwoven to form a plain weave pattern fabric.

[0094] Step 4: Immerse the sample fabric in a sodium hydroxide aqueous solution at 100℃ and pH 8.5 for 60 minutes, then remove it to dissolve the shell in the nascent fibers and swell the cotton fibers in the sample fabric. After 60 minutes, remove the sample fabric, wash it, and dry it to obtain the UV-resistant fabric.

[0095] The warp density of this UV-resistant fabric is 100 threads / cm, and the weft density is 90 threads / cm.

[0096] In this embodiment, both the warp and weft yarns of the UV-resistant fabric include a first fiber and a second fiber, wherein the cross-sectional structure of the first fiber is as follows: Figure 6 As shown, it includes a core 21 and a plurality of teeth 22 evenly spaced around the core 21. The length of the side of each tooth 22 away from the core 21 is greater than the distance between the two sides of two adjacent teeth 22 away from the core 21. In this embodiment, the core 21 of the first fiber includes an outer core 211 and an inner core 212. The outer core 211 and the inner core 212 have the same axis, and the outer core 211 is fitted around the outer periphery of the inner core 212. Each tooth 22 is quadrangular prism in shape. An opening 25 is provided at the connection between the teeth 22 of the first fiber and the outer core 211. In this embodiment, the teeth 22 and the outer core 211 of the first fiber are both made of UV-resistant polyamide, and the inner core 212 of the first fiber is made of polyamide. The volume ratio of the UV-resistant polyamide of the outer core 211 to the polyamide of the inner core 212 is 1:3.

[0097] Example 4-3

[0098] Step 1: Powder and sieve the polyamide 6 chips to obtain polyamide powder. Blend the polyamide powder with titanium dioxide and granulate to obtain UV-resistant polyamide masterbatch. Then, granulate the remaining polyamide powder to form polyamide masterbatch. The titanium dioxide content in the UV-resistant polyamide masterbatch is 5% by mass.

[0099] Step 2: After pre-crystallizing and drying the water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch respectively, take water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch in a volume ratio of 1:0.5:1 and put them into a spinning box. After melt extrusion, filtration, and metering, the melts of water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch enter the corresponding feed hoppers in the spinning box. The melts of the three polymers pass through the filter and distribution plate in the spinning box according to their respective paths, and then are spun by the spinneret. After cooling and solidification, the desired product is obtained. Figure 7 The nascent fibers shown are then oiled, stretched, and shaped. The spinneret in this embodiment has the following shape: Figure 8 As shown, it has the same shape as the spinneret in Examples 2-3.

[0100] Step 3: Blend the nascent fiber and cotton fiber at a blending ratio of 1:1 to obtain yarn, and use this yarn as both warp and weft yarns. Warp the warp yarns onto the warp beam and thread them sequentially into the heddle wires of the corresponding heddle frames. Then, thread the warp yarns into the reed teeth according to the rule of 3 insertions per reed. Set the heddle lifting sequence on the sample loom. Introduce one weft yarn for each weft insertion, and sequentially perform shedding, weft insertion, weft insertion, crimping, and warp feeding. The warp and weft yarns are tightly interwoven to form a plain weave pattern fabric.

[0101] Step 4: Immerse the sample fabric in a sodium hydroxide aqueous solution at 100℃ and pH 8.5 for 60 minutes, then remove it to dissolve the shell in the nascent fibers and swell the cotton fibers in the sample fabric. After 60 minutes, remove the sample fabric, wash it, and dry it to obtain the UV-resistant fabric.

[0102] The warp density of this UV-resistant fabric is 100 threads / cm, and the weft density is 90 threads / cm.

[0103] In this embodiment, both the warp and weft yarns of the UV-resistant fabric include a first fiber and a second fiber, wherein the cross-sectional structure of the first fiber is as follows: Figure 9As shown, it includes a core 21 and a plurality of teeth 22 evenly spaced around the core 21 in the circumferential direction. The length of the side of each tooth 22 away from the core 21 is greater than the distance between the two sides of two adjacent teeth 22 away from the core 21. In this embodiment, the core 21 of the first fiber is a single unit and is cylindrical in shape; each tooth 22 is quadrangular prism in shape; and no opening 25 is provided at the connection between the teeth 22 of the first fiber and the core 21. In this embodiment, the material of the teeth 22 of the first fiber is UV-resistant polyamide, and the material of the core 21 is polyamide.

[0104] Example 4-4

[0105] Step 1: Powder and sieve the polyamide 6 chips to obtain polyamide powder. Blend the polyamide powder with titanium dioxide and granulate to obtain UV-resistant polyamide masterbatch. Then, granulate the remaining polyamide powder to form polyamide masterbatch. The titanium dioxide content in the UV-resistant polyamide masterbatch is 10% by mass.

[0106] Step 2: After pre-crystallizing and drying the water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch respectively, take water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch in a volume ratio of 1:1:3 and put them into a spinning box. After melt extrusion, filtration, and metering, the melts of water-soluble polyester, UV-resistant polyamide masterbatch, and polyamide masterbatch enter the corresponding feeding hoppers in the spinning box. The melts of the three polymers pass through the filter and distribution plate in the spinning box according to their respective paths, and then are spun by the spinneret. After cooling and solidification, the desired product is obtained. Figure 10 The nascent fibers shown are then oiled, stretched, and shaped. The spinneret in this embodiment has the following shape: Figure 11 As shown, it has the same shape as the spinneret in Examples 2-4.

[0107] Step 3: Blend the nascent fiber and cotton fiber at a blending ratio of 1:1 to obtain yarn, and use this yarn as both warp and weft yarns. Warp the warp yarns onto the warp beam and thread them sequentially into the heddle wires of the corresponding heddle frames. Then, thread the warp yarns into the reed teeth according to the rule of 3 insertions per reed. Set the heddle lifting sequence on the sample loom. Introduce one weft yarn for each weft insertion, and sequentially perform shedding, weft insertion, weft insertion, crimping, and warp feeding. The warp and weft yarns are tightly interwoven to form a plain weave pattern fabric.

[0108] Step 4: Immerse the sample fabric in a sodium hydroxide aqueous solution at 100℃ and pH 8.5 for 60 minutes, then remove it to dissolve the shell in the nascent fibers and swell the cotton fibers in the sample fabric. After 60 minutes, remove the sample fabric, wash it, and dry it to obtain the UV-resistant fabric.

[0109] The warp density of this UV-resistant fabric is 100 threads / cm, and the weft density is 90 threads / cm.

[0110] In this embodiment, both the warp and weft yarns of the UV-resistant fabric include a first fiber and a second fiber, wherein the cross-sectional structure of the first fiber is as follows: Figure 12 As shown, it includes a core 21 and a plurality of teeth 22 evenly spaced around the core 21. The length of the side of each tooth 22 away from the core 21 is greater than the distance between the two sides of two adjacent teeth 22 away from the core 21. In this embodiment, the core 21 of the first fiber includes an outer core 211 and an inner core 212. The outer core 211 and the inner core 212 have the same axis, and the outer core 211 is fitted around the outer periphery of the inner core 212. Each tooth 22 is quadrangular prism in shape. No opening 25 is provided at the connection between the teeth 22 of the first fiber and the outer core 211. In this embodiment, the teeth 22 and the outer core 211 of the first fiber are both made of UV-resistant polyamide, and the inner core 212 of the first fiber is made of polyamide. The volume ratio of the UV-resistant polyamide of the outer core 211 to the polyamide of the inner core 212 is 1:2.

[0111] Comparative Example 1

[0112] The difference between Comparative Example 1 and Example 4-1 is that the shape of the holes in the spinneret of Comparative Example 1 is different from that of Example 4-1, such as... Figure 13 As shown, the spinneret in this comparative example has a first hole 11 and a third hole 13, the center of which coincides with the center of the first hole 11. The diameter of the first hole 11 is smaller than the outer diameter of the third hole 13.

[0113] Furthermore, such as Figure 14 As shown, the nascent fiber prepared in this comparative example includes a core 21 and a shell. The shell is located on the outer periphery of the core 21, and the core 21 is cylindrical with its axis coinciding with that of the shell. The core 21 is made of UV-resistant polyamide, and the shell is made of soluble polyester.

[0114] After the sample fabric was placed in a sodium hydroxide aqueous solution for 60 minutes, the shell of the nascent fibers was dissolved. The resulting UV-resistant fabric, after washing and drying, consisted of warp and weft yarns, each including a first fiber and a second fiber (not shown). The first fiber was the nascent fiber from which the water-soluble polyester had dissolved, leaving only a cylindrical core 21 with a cross-sectional shape as shown. Figure 15 As shown. The core 21 of the first fiber is made of UV-resistant polyamide.

[0115] Comparative Example 2

[0116] This comparative example provides a method for preparing an anti-ultraviolet fabric, which specifically includes the following steps:

[0117] Step 1: Powder and sieve the polyamide 6 chips to obtain polyamide powder. Blend the polyamide powder with titanium dioxide and granulate to obtain UV-resistant polyamide masterbatch. The mass percentage of UV-resistant powder in the UV-resistant polyamide masterbatch is 5%.

[0118] Step 2: After pre-crystallizing and drying the UV-resistant polyamide masterbatch, it is placed in a spinning box for melt extrusion, filtration, and metering. The melt of the UV-resistant polyamide masterbatch enters the feeding hopper in the spinning box, passes through the filter and distribution plate, and is then spun by the spinneret. After cooling and solidification, nascent fibers are obtained. The nascent fibers are then oiled, stretched, and shaped. In this comparative example, the spinneret has round holes. The nascent fibers obtained in this step include a core 21, and the material of the core 21 is UV-resistant polyamide.

[0119] Step 3: The nascent fiber and cotton fiber are blended at a 1:1 ratio to obtain yarn. This yarn is used as both warp and weft yarns. The warp yarns are warped onto the warp beam and then sequentially threaded into the heddles of the corresponding heddle frames. Following a 3-thread-per-reed pattern, the warp yarns are then threaded into the reed teeth. The heddle-lifting sequence is set on a small-scale loom. One weft yarn is introduced for each weft pass, and the processes of shearing, weft insertion, beating, crimping, and warp feeding are performed sequentially. The warp and weft yarns are tightly interwoven to form a plain weave pattern. However, in the machine experiment, because the nascent fiber lacks soluble polyester on its outer surface, it directly rubs against the UV-resistant polyamide during weaving. Its poor abrasion resistance leads to easy warp breakage during warping and weaving, making subsequent operations impossible.

[0120] Comparative Example 3

[0121] The difference between Comparative Example 3 and Examples 4-3 is that the shape of the holes in the spinneret of Comparative Example 3 is different from that of Examples 4-3, such as... Figure 16 As shown, the spinneret in this comparative example has a first hole 11, a second hole 12, and a third hole 13, with the second hole 12 located between the first hole 11 and the third hole 13. The first hole 11 is circular, while the second hole 12 and the third hole 13 are both annular, and their centers coincide. The diameter of the first hole 11 is smaller than the outer diameter of the second hole 12, and the outer diameter of the second hole 12 is smaller than the outer diameter of the third hole 13.

[0122] Furthermore, such as Figure 17 As shown, the nascent fiber prepared in this comparative example includes a core 21, a toothed portion 22, and a shell portion. The toothed portion 22 is located on the outer periphery of the core 21, and the shell portion is located on the outer periphery of the toothed portion 22. The core 21 is cylindrical, and the axes of the three portions coincide. The core 21 is made of polyamide, the toothed portion 22 is made of UV-resistant polyamide, and the shell portion is made of soluble polyester.

[0123] When the sample fabric is placed in a sodium hydroxide aqueous solution for 60 minutes, the shell of the nascent fibers is dissolved. After washing and drying, the resulting UV-resistant fabric consists of warp and weft yarns, each containing a first fiber and a second fiber (not shown). The first fiber is the nascent fiber in which water-soluble polyester has been dissolved, and its cross-sectional shape is as follows. Figure 18 As shown, it has a core 21 and an annular toothed portion 22 located on the outer periphery of the core 21; the toothed portion 22 of the first fiber is made of UV-resistant polyamide, and the core 21 of the first fiber is made of polyamide.

[0124] Comparative Example 4

[0125] Step 1: Powder and sieve the polyamide 6 chips to obtain polyamide powder. Mix a portion of the polyamide powder with titanium dioxide and granulate to obtain UV-resistant polyamide masterbatch. Then granulate the remaining polyamide powder to form polyamide masterbatch. The titanium dioxide content in the UV-resistant polyamide masterbatch is 3% by mass.

[0126] Step 2: After pre-crystallizing and drying the UV-resistant polyamide masterbatch and polyamide masterbatch respectively, a volume ratio of 1:5 of the UV-resistant polyamide masterbatch and polyamide masterbatch is placed in a spinning box. After melt extrusion, filtration, and metering, the melt of the UV-resistant polyamide masterbatch and the melt of the polyamide enter the corresponding feed hoppers in the spinning box. The melts of the two polymers pass through the filter and distribution plate in the spinning box according to their respective paths, and then are spun by the spinneret. After cooling and solidification, nascent fibers are obtained. The nascent fibers are then oiled, stretched, and shaped. In this comparative example, the shape of the holes on the spinneret is two concentric circles. The nascent fibers obtained in this step include a core 21 and a tooth 22. The tooth 22 is located on the outer periphery of the core 21. The core 21 is cylindrical, and the axes of the core 21 and the tooth 22 coincide. The core 21 is made of polyamide, and the tooth 22 is made of UV-resistant polyamide.

[0127] Step 3: The nascent fiber and cotton fiber are blended at a 1:1 ratio to obtain yarn. This yarn is used as both warp and weft yarns. The warp yarns are warped onto the warp beam and then sequentially threaded into the heddles of the corresponding heddle frames. Following a 3-thread-per-reed pattern, the warp yarns are then threaded into the reed teeth. The heddle-lifting sequence is set on a small-scale loom. One weft yarn is introduced for each weft pass, and the processes of shearing, weft insertion, beating, crimping, and warp feeding are performed sequentially. The warp and weft yarns are tightly interwoven to form a plain weave pattern. However, in the machine experiment, because the nascent fiber lacks soluble polyester on its outer surface, it directly rubs against the UV-resistant polyamide during weaving. Its poor abrasion resistance leads to easy warp breakage during warping and weaving, making subsequent operations impossible.

[0128] Results and Discussion:

[0129] Table 1 below shows the performance test data of the UV-resistant fabrics prepared according to the preparation methods of Examples 4-1 to 4-4 and Comparative Examples 1 to 4.

[0130] Table 1 Performance Test Data of UV-resistant Fabrics

[0131] Example 4-1 76.8 113 Example 4-2 85.9 125 Example 4-3 52.9 116 Example 4-4 54.2 119 Comparative Example 1 62.1 101 Comparative Example 2 - - Comparative Example 3 50.1 100 Comparative Example 4 - -

[0132] As can be seen from Examples 4-1 to 4-4, the UPF values ​​of the fabrics in Examples 4-1 to 4-4 are all greater than 50%, meeting the UV resistance standards for fabrics. Since the nascent fibers are all encapsulated by soluble polyester, which has a certain degree of abrasion resistance, the addition of UV-resistant powder in Examples 4-1 to 4-4 did not affect the weaving performance of the fabrics, nor did it result in yarn breakage. Furthermore, because the UV-resistant polyamide is encapsulated within the soluble polyester, when the outer soluble polyester is dissolved, the UV-resistant polyamide is partially exposed. Due to the special structure of the nascent fibers, the absorption and reflection of ultraviolet rays by the nascent fibers are increased, thereby improving the UV resistance of the fabric.

[0133] Furthermore, in Examples 4-1 to 4-4, the functional fibers in the nascent fibers swell, increasing in volume and filling the gaps created by the dissolution of the water-soluble polyester in the nascent fibers. This further prevents ultraviolet rays from penetrating the fabric, thus ensuring the fabric's UV resistance. Also, because the grooves between the multiple teeth 22 prevent the first fiber from completely adhering to the swollen second fiber, the gaps between the teeth 22 of the first fiber and the second fiber become channels for air circulation, which helps increase the breathability of the functional fabric.

[0134] The functional fabrics of Examples 4-1 to 4-4 are breathable, lightweight, and have good UV protection properties, and can be used to make sun-protective clothing, etc.

[0135] The fabrics of Comparative Examples 1 and 3 have poor UV resistance and do not meet the national standard. Although the yarns of Comparative Examples 1 and 3 contain UV-resistant powder, the teeth 22 of the nascent fibers in Comparative Examples 1 and 3 are annular. Compared with the case where multiple teeth 22 of the nascent fibers are arranged alternately in Examples 4-1 to 4-4, the contact area between the annular teeth 22 and ultraviolet rays is reduced, thus reducing the absorption and reflection of ultraviolet rays, ultimately resulting in a decrease in the UV resistance of the fabric.

[0136] In Comparative Examples 2 and 4, since the nascent fibers are not encapsulated by soluble polyester, when friction occurs between yarns, between yarns and reeds, or between yarns and heddles during weaving, the friction directly occurs with the UV-resistant polyamide in the yarn. Since the UV-resistant polyamide has poor abrasion resistance, warp breaks are likely to occur during the warping and weaving steps, making it impossible to continue subsequent operations.

[0137] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A functional fabric, characterized in that, The device comprises warp and weft yarns, wherein the warp yarn density is greater than or equal to 100 threads / cm and the weft yarn density is greater than or equal to 90 threads / cm. Both the warp and weft yarns include a first fiber and a second fiber. The first fiber has a core and a plurality of teeth spaced apart in the circumferential direction of the core. The length of the side of each tooth away from the core is greater than the distance between the two sides of two adjacent teeth away from the core. The core includes an outer core and an inner core, which have the same axis. The outer core is fitted around the outer periphery of the inner core. Each tooth has an opening at the connection point with the outer core. The teeth and the outer core are both made of functional polyamide, and the inner core is made of functional polyamide or polyamide. The first fiber is obtained by spinning a mixture of water-soluble polyester and functional masterbatch to obtain nascent fiber, and then dissolving the shell portion of the nascent fiber to obtain the nascent fiber. The nascent fiber includes a core, teeth, and a shell portion. The teeth portion is located between the shell portion and the core portion and is spaced apart in the circumferential direction of the core portion. The shell portion includes a shell body and an extension portion. The extension portion is embedded in the gap between two adjacent teeth portions. The second fiber is a cellulose fiber.

2. The functional fabric according to claim 1, characterized in that, Multiple teeth are evenly spaced along the circumference of the core, and the core is cylindrical in shape.

3. The functional fabric according to claim 1, characterized in that, The functional fabric is an anti-ultraviolet fabric, and the toothed part and the core are both made of anti-ultraviolet polyamide.

4. The functional fabric according to claim 1, characterized in that, The functional fabric is an anti-ultraviolet fabric, the toothed part and the outer core are made of anti-ultraviolet polyamide, and the inner core is made of polyamide.

5. The functional fabric according to claim 1, characterized in that, The cellulose fibers include one or more of cotton fibers and linen fibers.

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