Short fiber linen slub yarn, polyester single hole filament composite yarn, and preparation method and application thereof

Abstract

The present application belongs to the technical field of composite spinning, and particularly relates to short-fiber flax and bamboo yarn wrapped polyester single-hole filament composite yarn and a preparation method and application thereof. Cotton short fibers and silk short fibers are first blended and drafted, flax fine dry yarn is aged and then drafted alone, and then the two kinds of drafted yarn are combined at intervals to prepare a white space blended drafted yarn. The drafted yarn is spun into a characteristic white space bamboo base yarn, and then wrapped by a network-free polyester single-hole filament in a same direction spiral manner to form a unique concave-convex texture and a fancy white space appearance. The bamboo structure and the white space combination process can effectively reinforce the yarn breaking strength, improve the wear resistance and size stability, avoid the defects of flax and silk short fiber spinning such as easy breaking, shrinkage and deformation, and improve the weaving processing applicability and product durability while taking into account the fabric fancy style and wearing comfort performance.

Description

Technical Field

[0001] This invention belongs to the field of composite spinning technology, specifically relating to short-fiber flax slub yarn wrapped with polyester single-hole filament composite yarn, its preparation method and application. Background Technology

[0002] Flax fiber is a commonly used raw material for high-end natural textiles due to its excellent breathability and heat dissipation, natural antibacterial properties, and unique rough texture. Cotton fiber has excellent moisture absorption and a skin-friendly feel, while silk staple fiber has a soft luster and delicate texture. Theoretically, combining these three can create a high-value-added yarn that combines strength and softness.

[0003] Traditional linen blends often employ a direct blending process with loose linen fibers, such as cotton and silk. However, due to the difference in physical properties between linen (high rigidity, low crimp) and cotton / silk (softness and delicacy), hard linen grains and cotton knots are easily generated during the opening and combing process due to "selective distribution," leading to uneven yarn and uncontrollable fabric defects. Furthermore, the high-rigidity linen in conventional blended yarns has poor cohesion, resulting in high hairiness and numerous weak links, leading to a persistently high breakage rate during weaving. Meanwhile, ordinary slub yarn lacks skeletal support, making it prone to collapse and deformation during subsequent processing and wear, and difficult to maintain its three-dimensional texture over time. Conventional softening methods used to address the itching sensation of linen (such as singeing and chemical treatment) often come at the cost of sacrificing its unique "blank" texture. If conventional porous filaments are used for reinforcement, the thick covering layer will completely obscure the natural fiber's depth and slub texture, resulting in a fabric with a single "synthetic fiber feel." This fails to simultaneously meet the multiple requirements of a natural blank style, three-dimensional slub texture, softness and skin-friendliness, high strength and abrasion resistance, and anti-pilling properties, thus hindering the promotion and application of high-end composite linen yarns. Summary of the Invention

[0004] The purpose of this invention is to provide a composite yarn of short-fiber flax slub yarn and polyester single-hole filament, as well as its preparation method and application, thereby overcoming the shortcomings of the prior art. Through the process of making slivers of multiple components separately, precise sliver blending with white space, and flexible covering of single-hole filaments, the yarn is endowed with soft and skin-friendly properties, high strength and wear resistance, and anti-pilling properties while retaining the natural flax style and three-dimensional slub texture, thus meeting the needs of high-end fabric development.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: In a first aspect, the present invention provides a method for preparing a composite yarn of short-fiber flax slub yarn and polyester single-hole yarn, comprising the following steps: mixing cotton short fibers and silk short fibers in sequence, combining fibers, combing fibers, needle combing and drawing sliver to obtain a cotton-silk sliver; After the dried flax is cured and processed, it is combed and needle combed in sequence to obtain flax strips. Cotton and silk slivers are alternately combined with linen slivers to produce a blank-blend blended sliver. The blank blended sliver is processed into roving and spun into slub blended yarn in sequence to obtain blank slub blended yarn; The non-networked polyester single-hole filament is spirally wrapped around the outer surface of the blank slub blended yarn, and then formed into a winding tube to obtain a short-fiber flax slub yarn wrapped with polyester single-hole filament composite yarn.

[0006] The preparation method of this invention can enhance the softness, skin-friendliness, and luster of the yarn by relying on cotton and silk, and give the yarn breathable, dry, antibacterial, and crisp properties by using flax fiber. The slub structure combined with the blanking process creates a unique textured surface and a fancy blanking appearance. The polyester single-hole yarn wrapped in the outer layer in the same direction can effectively strengthen the yarn's breaking strength, improve abrasion resistance and dimensional stability, and avoid the defects of flax and silk short fiber spinning that are prone to breakage, shrinkage and deformation.

[0007] Secondly, the present invention provides a method for preparing short-fiber flax slub yarn-covered polyester single-hole filament composite yarn. The short-fiber flax slub yarn-covered polyester single-hole filament composite yarn includes a core yarn and a polyester single-hole filament spirally covered on its surface; the core yarn is a slub blended yarn with a blank surface.

[0008] The short-fiber flax slub yarn-covered polyester single-hole filament composite yarn prepared by this invention adopts a composite structure with a blank slub blended yarn as the core yarn and a co-directional spiral-covered polyester single-hole filament outer layer. The blank slub blended yarn core yarn combines the advantages of cotton, silk and flax fibers, possessing the soft luster of silk, the skin-friendly comfort of cotton fibers and the breathable, antibacterial, dry and crisp properties of flax. The blank slub structure gives the yarn a unique texture and distinctive fancy appearance, while the spiral-covered polyester single-hole filament outer layer can significantly enhance the yarn strength, improve abrasion resistance and dimensional stability.

[0009] Thirdly, this invention provides the application of short-fiber flax slub yarn-covered polyester single-hole composite yarn in clothing fabrics and home textile decorative fabrics. Preferably, it is applied in high-end fashion fabrics, casual textured fabrics, home textile decorative fabrics, and light luxury knitted fabrics.

[0010] This short-fiber linen slub yarn-covered polyester single-hole filament composite yarn possesses a natural textured surface and the skin-friendly, breathable, warm, lustrous, dry, and antibacterial properties of cotton, silk, and linen. Combined with the high strength, abrasion resistance, shrinkage resistance, and dimensional stability provided by the outer spiral-covered polyester single-hole filament, it can meet the stringent requirements of high-end fashion and light luxury knitted fabrics for texture, wearing comfort, and sophisticated visual style. It can also highlight the unique patterned texture of casual textured fabrics and is suitable for the durable and easy-care requirements of home textile decorative fabrics, thus broadening the product application scenarios of this composite yarn.

[0011] The beneficial effects of this invention are: (1) The present invention adopts an integrated process of making each fiber into strips separately, mixing dyed cotton and silk composite strips with flax strips in layers, feeding raw flax into the molded blanks at fixed points, spinning three-dimensional slub base yarn and then supplementing it with low tension to cover polyester single-hole filaments, which solves the problems of flax being hard, having poor evenness and being easy to break, while retaining the flax feel and breathability. Colored cotton-silk blended stripes and natural linen stripes are prepared independently and blended with blank spaces, abandoning the traditional loose blending method. This significantly improves the uniformity of fiber mixing, reducing linen grains and cotton knots at the source, and precisely creating a natural color-shading style with light and dark blank spaces. The cotton-silk blended with linen strip structure balances softness and luster with the natural feel of linen, resulting in rich layers and a unique style. The disordered random slub molding process ensures that the slubs are stable and not easily deformed, making them durable after washing and retaining their three-dimensional texture for a long time. Special polyester single-hole filaments are used for wrapping, resulting in a smooth and thin surface that does not obscure the internal blank spaces and slub texture, unlike ordinary multi-hole wrapped yarns. The outer filaments isolate the coarse linen fibers, completely solving the problem of itching, while significantly improving the yarn strength, abrasion resistance, and anti-pilling level. The entire process relies on existing spinning machines such as wool blending, combing, carding, drawing, roving, slub spinning, and pile spinning, making it highly mass-producible.

[0012] (2) The blending process of this invention results in uniform mixing, significantly reduced hemp and cotton knots, and a marked improvement in yarn evenness, resulting in a clean and neat fabric surface. The single-hole polyester filament coating enhances strength, significantly reduces fuzz, and improves yarn evenness, thus mitigating the problems of linen breakage and itchiness. It features a natural blended white space effect, combined with disordered three-dimensional slub joints, creating an original texture style with high market recognition. It retains the breathable and moisture-wicking properties of linen and its natural linen feel. It combines the softness of cotton, the luster of silk, and the coolness of linen. The outer single-hole filament eliminates itchiness, and the skin-friendly and breathable composite yarn has a breaking strength increased by more than 32%, reducing the weaving breakage rate, making it wear-resistant, pill-resistant, and extending its service life. Attached Figure Description

[0013] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0014] Figure 1 This is a flowchart of the preparation method of short-fiber flax slub yarn wrapped with polyester single-hole filament composite yarn in Embodiment 1 of the present invention; Figure 2 The finished product with a bamboo-linen style is made from short-fiber flax slub yarn wrapped with polyester single-hole yarn composite yarn with different dyeing in Example 1 of the present invention, wherein a is a mocha brown fabric finished product, b is a palm brown green fabric finished product, c is a denim blue fabric finished product and d is a light yellow fabric finished product. Figure 3 This is a hollow knitted fabric made from short-fiber flax slub yarn wrapped with polyester single-hole yarn composite yarn, as described in Example 1 of this invention. Detailed Implementation

[0015] Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of the invention. Specific conditions not specified in the embodiments are performed under conventional conditions or conditions recommended by the manufacturer. Components not specifying their manufacturers are all commercially available conventional products. Specifically, the cotton staple fiber has a length of 37-39 mm, the silk staple fiber has a length of 40-45 mm, the flaxseed has a length of 40-50 mm, and the polyester monofilament has a fineness (denier) of 30D-40D.

[0016] To address the existing problems in the processing of hemp yarns, such as uneven blending of cotton, silk and flax leading to more hemp grains and cotton knots, poor yarn evenness, and difficulty in achieving a natural sense of layering with segmented blank spaces; unstable shape of slub base yarn that is prone to deformation, and the inherent itchiness of flax affecting skin-friendliness; conventional filament wrapping that easily obscures the blank texture and slub grain pattern, making it difficult to balance strength, abrasion resistance and anti-pilling performance; and complex process flow that is difficult to adapt to conventional equipment for large-scale mass production, etc.

[0017] This invention provides a linen blended yarn that combines natural texture and wearing comfort, as well as its preparation method. First, colored cotton and silk blended strips are prepared separately from linen strips and then blended to achieve a precise distribution of fiber gradients, creating a natural light and dark "blank space" style. Then, a disordered random slub process is used for shaping, combined with a single-hole polyester filament covering technology, providing only a strong skeleton without filling the surface. This completely solves the problems of itchiness, poor evenness, and easy breakage of pure linen, while retaining the breathability, rough texture, and three-dimensionality of the linen strips. The preparation method is simple, compatible with conventional textile equipment, and can be mass-produced.

[0018] In a first aspect, the present invention provides a method for preparing short-fiber flax slub yarn-covered polyester single-hole filament composite yarn, comprising the following steps: mixing cotton short fibers and silk short fibers in sequence, combining fibers, combing fibers, needle combing and drawing sliver to obtain cotton-silk sliver; After the dried flax is cured and processed, it is combed and needle combed in sequence to obtain flax strips. Cotton and silk slivers are alternately combined with linen slivers to produce a blank-blend blended sliver. The blank blended sliver is processed into roving and spun into slub blended yarn in sequence to obtain blank slub blended yarn; The non-networked polyester single-hole filament is spirally wrapped around the outer surface of the blank slub blended yarn, and then formed into a winding tube to obtain a short-fiber flax slub yarn wrapped with polyester single-hole filament composite yarn.

[0019] This invention employs a strip-blending process to achieve thorough and uniform mixing of raw materials, effectively reducing defects such as linen and cotton knots in the yarn, optimizing yarn evenness, and ensuring a clean and smooth fabric surface in subsequent weaving. Utilizing a single-hole polyester filament outer layer structure, it enhances yarn breaking strength, reduces surface fuzz, and further optimizes evenness, fundamentally addressing the drawbacks of linen fiber's tendency to break easily and causing itching when worn. The strip-blending process creates a natural white space effect, combined with a three-dimensional irregular slub structure to create a unique original texture, while retaining the excellent moisture absorption, breathability, and natural linen feel of linen itself. In terms of performance, it integrates the soft touch of cotton, the elegant luster of silk, and the cool and dry properties of linen, with the outer single-hole filament layer mitigating itching defects, ultimately achieving a skin-friendly, breathable fabric with a combination of excellent performance characteristics.

[0020] In some other embodiments, the short-fiber flax slub yarn-covered polyester single-hole filament composite yarn, by weight, comprises the following components: 50-60 parts cotton staple fiber, 10-15 parts silk staple fiber, 20-25 parts flax fiber, and 10-11 parts non-networked polyester single-hole filament. Preferably, it comprises 58 parts cotton staple fiber, 11 parts silk staple fiber, 20 parts flax fiber, and 11 parts non-networked polyester single-hole filament.

[0021] Cotton staple fiber is colored cotton staple fiber (dyed cotton staple fiber), which can improve the basic softness and spinnability of yarn; silk staple fiber gives yarn a delicate luster and soft hand feel; linen retains the natural breathable, moisture-wicking and cool properties of raw materials and the original linen texture; single-hole polyester filament is a single strand without network, with high strength, smooth surface and relatively strong structure.

[0022] Within this range, it avoids excessive linen content, which can cause yarn stiffness, itching, and frequent yarn breakage. It also prevents excessive silk usage from increasing production costs and reducing the abrasion resistance of the finished product. A reasonable proportion of cotton fiber optimizes the uniformity of the blend and reduces cotton knots and linen grains. The appropriate proportion of polyester filament improves hairiness and dimensional stability without masking the natural texture of cotton, silk, and linen, while taking into account spinning and processing performance and fabric appearance and texture.

[0023] In some other embodiments, the cotton staple fiber has a fiber length of 37-39 mm, the silk staple fiber has a fiber length of 40-45 mm, the flax fiber has a fiber length of 40-50 mm, and the fineness of the non-networked polyester monofilament is 30D-40D.

[0024] The three short fibers are similar in length and have a small drop, which greatly improves the uniformity of the blend and effectively reduces cotton knots, linen grains and yarn breaks, solving the problem of uneven yarn. The non-networked polyester single-hole filament has a moderate thickness, which can fully wrap the core yarn, effectively gather the yarn hairs, strengthen the yarn strength, and weaken the itchiness of linen, without the silk thread being too thick and covering the natural white space and three-dimensional texture of the core yarn.

[0025] In some other embodiments, the basis weight of the molten cotton silk sliver is 15-18 g / 5m, and the basis weight of the molten flax sliver is 17-18.5 g / 5m.

[0026] The entire process employs a flexible combing technique to reduce combing and impact on the fibers, protecting the silk fibers from damage.

[0027] In other embodiments, 8-10 slivers are used for intermittent blending, with 2-3 blending processes. The basis weight of the blended sliver with white space is 15-16 g / 5m, and the draw ratio is 6.0-8.2 times. By controlling the rhythm of the alternating blending of fibers, a natural effect of alternating light and dark white spaces is formed.

[0028] In other embodiments, the base yarn spun from slub yarn has a count of 40-48 NM, a twist of 600-650 twists / m, a slub ratio of 1.7-2.4, and a slub length of 5-8 cm. Light drafting and low tension spinning are used to ensure full, three-dimensional slubs and to completely preserve the original layers of the blended yarn.

[0029] In other embodiments, the feed tension of the non-networked polyester single-hole filament in the co-directional spiral coating is 10-15 cN, the twist of the short-fiber flax slub yarn-coated polyester single-hole filament composite yarn is 650-750 twists / m, and the production speed is 20-30m / min. The coating force is gentle, without compressing the slub protrusions, without covering the striped and white texture, and the filaments and core yarn are tightly bound together without fraying or slipping.

[0030] Secondly, the present invention provides a method for preparing a composite yarn of short-fiber flax slub yarn covered with polyester single-hole filament, thereby obtaining a composite yarn of short-fiber flax slub yarn covered with polyester single-hole filament.

[0031] In some other embodiments, the short-fiber flax slub yarn-covered polyester single-hole filament composite yarn includes a core yarn and a polyester single-hole filament spirally covered on its surface; the core yarn is a slub blended yarn with a blank surface.

[0032] In some other embodiments, the breaking strength of the short-fiber flax slub yarn-covered polyester single-hole filament composite yarn is 240-270 CN, and the anti-pilling grade is 4.

[0033] Thirdly, this invention provides the application of short-fiber linen slub yarn-covered polyester single-hole composite yarn in apparel fabrics and home textile decorative fabrics. Preferably, it is used in high-end fashion fabrics, casual textured fabrics, home textile decorative fabrics, and light luxury knitted fabrics. This composite yarn meets multiple requirements including a natural, minimalist style, a three-dimensional slub texture, softness and skin-friendliness, high strength and abrasion resistance, and anti-pilling properties, making it suitable for the widespread application of high-end composite linen yarns.

[0034] The solution of the present invention will be further described below with reference to specific embodiments and comparative examples: Example 1 1. The short-fiber flax slub yarn-covered polyester single-hole filament composite yarn is composed of the following components by weight: 58 parts cotton staple fiber, 11 parts silk staple fiber, 20 parts flax fiber and 11 parts 30D polyester single-hole filament.

[0035] 2. A method for preparing a composite yarn of short-fiber flax slub yarn and polyester single-hole filament, such as... Figure 1 As shown, the specific steps include: Step 1: Separate fiber strip making (1) Preparation of cotton and silk composite strips The separately dyed colored cotton staple fibers are mixed with silk staple fibers and then combed and needle-combed to form a uniform colored cotton-silk sliver. The entire process employs a flexible combing technique: 540 rpm for the licker-in roller, 180 rpm for the cylinder, and 20 rpm for the doffer, with a combing spacing of 12-12-10-10-12 silk flakes. This minimizes the combing and impact on the fibers, protecting them from damage. The finished colored cotton-silk sliver has a weight of 18 g / 5m.

[0036] (2) Flax slivers are individually shaped White flax, after undergoing conditioning treatment (softening treatment, adding moisture and oil to soften fiber rigidity and reduce stiffness), is combed and treated with two needle combs (one needle comb and two needle combs) to produce separate raw flax strips with good straightness. The weight of the raw flax strips is 18.3g / 5m.

[0037] Step 2: Strip mixing and blanking process The prepared colored cotton silk slivers and undyed linen slivers were alternately combined, with eight slivers arranged in an orderly manner. A two-stage blending process was used: first, a first-stage blending was performed, followed by a second-stage blending for further homogenization, and then the slivers were drawn. The drawn slivers naturally formed a gradient effect with alternating light and dark shades, resulting in a white-blend blended sliver. The basis weight of the white-blend blended sliver was 15g / 5m, and the draw ratio was 6.0 times, ensuring uniform mixing and no linen particles.

[0038] Step 3: Spin the slub base yarn using a blended yarn with a blank space. The sliver of the blank-blend blended yarn is processed into roving with the following parameters: roving weight 4.5g / 10m, twist 45 twists / m, and draft ratio 6.7. This roving is then fed into a slub spinning machine to produce a blank-blend slub blended yarn. The base yarn of this yarn has a count of 44NM, a twist of 630 twists / m, a slub ratio of 2, a slub length of 8cm, and a slub spacing of 35cm. Light drafting and low tension spinning are used to ensure full, three-dimensional slubs and to fully preserve the original layers of the blank-blend blend.

[0039] Step 4: Coating and shaping of polyester single-hole filament The core yarn is a slub blended yarn with a white background, and the outer covering yarn is a non-networked polyester single-hole filament. Low-tension, co-directional spiral covering is performed on a wool spinning machine, and the finished product is obtained by winding into a bobbin. The polyester single-hole filament has a fineness of 30D, a feed tension of 12cN, a finished product composite twist of 740 twists / m, and a production speed of 20m / min. The covering force is gentle, without compressing the slub protrusions or covering the white background texture. The filament and core yarn are tightly bound together, without fraying or slipping.

[0040] Taking the short-fiber flax slub yarn-covered polyester single-hole filament composite yarn obtained in Example 1 as an example, the finished fabric produced by knitting it on a fully automatic flat knitting machine is as follows: Figure 2 As shown. Among them, the finished product of mocha brown fabric ( Figure 2 a) Finished palm-brown green fabric ( Figure 2 (b) Finished denim blue fabric ( Figure 2 c) and the finished product of pale yellow fabric ( Figure 2 The four types of fabrics (d) have the same raw material composition and preparation method; the only difference lies in the dyeing process. Figure 2 It can be seen that the different dyed finished products have a bamboo-joint hemp-like style, are suitable for spring and summer clothing, and have the characteristics of moisture absorption, breathability, dryness and comfort.

[0041] The hollow knitted fabric, as shown in the figure, is made directly from the short-fiber flax slub yarn-covered polyester single-hole yarn composite yarn obtained in Example 1 and woven in one piece using a circular knitting weft knitting openwork jacquard knitting process. It has the characteristics of moisture absorption, breathability, dryness and comfort.

[0042] Example 2 The difference from Example 1 is that the short-fiber flax slub yarn-covered polyester single-hole filament composite yarn, by weight, consists of the following components: 50 parts cotton staple fiber, 15 parts silk staple fiber, 25 parts flax fiber, and 10 parts 30D polyester single-hole filament. The preparation method of the short-fiber flax slub yarn-covered polyester single-hole filament composite yarn is the same as that of Example 1.

[0043] Example 3 The difference from Example 1 is that the short-fiber flax slub yarn-covered polyester single-hole filament composite yarn, by weight, consists of the following components: 60 parts cotton staple fiber, 10 parts silk staple fiber, 20 parts flax fiber, and 10 parts 30D polyester single-hole filament. The preparation method of the short-fiber flax slub yarn-covered polyester single-hole filament composite yarn is the same as in Example 1.

[0044] Comparative Example 1 1. The short-fiber flax slub yarn-covered polyester single-hole filament composite yarn is composed of the following components by weight: 45 parts cotton staple fiber, 14 parts silk staple fiber, 30 parts flax fiber and 11 parts 30D polyester single-hole filament.

[0045] 2. A method for preparing a composite yarn of short-fiber flax slub yarn wrapped with polyester single-hole filament, which differs from Example 1 in that: In step 1, the quantitative amount of molten cotton silk sliver is 15g / 5m, and the quantitative amount of molten flax sliver is 15.8g / 5m.

[0046] In step 2, colored cotton silk slivers and uncolored linen slivers are alternately combined, with 8 slivers arranged in an orderly manner. A three-stage blending process is adopted, with intermittent feeding to achieve blanking. The blending quantity is 15.0g / 5m.

[0047] In step 3, the base yarn count of the slub blended yarn is 46NM, the base yarn twist is 605 twists / m, the slub ratio is 2.3 times, the slub length is 3cm, and the slub interval is 30cm.

[0048] In step 4, the polyester single-hole filament has a fineness of 30D, a feed tension of 12cN, a finished product composite twist of 740 twists / m, and a production speed of 25 m / min. Other steps are the same as in Example 1. The resulting product has a rugged yet comfortable style with distinct layers.

[0049] Comparative Example 2 1. The short-fiber flax slub yarn-covered polyester single-hole filament composite yarn is composed of the following components by weight: 68 parts cotton staple fiber, 7 parts silk staple fiber, 10 parts flax fiber and 15 parts 40D polyester single-hole filament.

[0050] 2. A method for preparing a composite yarn of short-fiber flax slub yarn wrapped with polyester single-hole filament, which differs from Example 1 in that: In step 1, the quantitative amount of processed cotton silk slivers is 16.2g / 5m, and the quantitative amount of processed flax slivers is 17.2g / 5m.

[0051] In step 2, colored cotton silk strips and uncolored linen strips are alternately combined, with 8 strips arranged in an orderly manner. Two blending processes are used, leaving the strips naturally blended with white space.

[0052] In step 3, the base yarn count of the slub blended yarn is 46NM, the base yarn twist is 670 twists / m, the slub ratio is 1.8, the slub length is 6cm, and the slub spacing is 30cm.

[0053] In step 4, the polyester single-hole filament has a fineness of 40D, a feed tension of 14cN, a finished product composite twist of 710 twists / m, and a production speed of 25 m / min. Other steps are the same as in Example 1. The resulting product has a rugged yet comfortable style with distinct layers.

[0054] Comparative Example 3 The difference from Example 1 is that a traditional production process, such as loose fiber blending, is used, specifically including the following steps: In step 1, cotton staple fiber, silk staple fiber and flax fiber are mixed together without further blending to obtain a cotton-silk-flax blend.

[0055] In step 2, the cotton, silk and flax blend is made into a sliver, which is then combined and drafted through three stages to produce roving. The roving has a basis weight of 4.5g / 10m, a twist of 45 twists / meter, and a draft ratio of 6.7.

[0056] In step 3, the roving is fed into the slub yarn device to produce slub blended yarn. The base yarn of the slub blended yarn has a count of 46 NM, a twist of 670 twists / m, a slub ratio of 1.8, a slub length of 6 cm, and a slub pitch of 30 cm.

[0057] In step 4, slub blended yarn is used as the core yarn, and non-networked polyester single-hole filament is selected as the outer covering yarn. Low-tension, co-directional spiral covering is performed on a wool spinning machine, and finally, the yarn is wound into a tube to obtain the finished product for sale. The non-networked polyester single-hole filament has a fineness of 40D, a feed tension of 14cN, a finished product composite twist of 710 twists / m, and a production speed of 25 m / min. Other raw material compositions are consistent with Example 1. The resulting finished product has a rugged and comfortable style with no white marks.

[0058] Comparative Example 4 The difference from Example 1 is that the short-fiber flax slub yarn-covered polyester single-hole filament composite yarn is composed of the following components by weight: 55 parts cotton short fiber, 15 parts silk short fiber, and 30 parts flax fiber; in the preparation method, step 4 is omitted, that is, the surface of the core yarn is not covered with polyester single-hole filament; the other steps are the same as in Example 1.

[0059] Comparative Example 5 The difference from Example 1 is that the 30D polyester single-hole filament is replaced with an equal amount of 30D / 24F network filament (porous filament); the other raw material composition and preparation steps are the same as in Example 1.

[0060] Performance testing The performance of the examples and comparative examples is shown in Table 1. The test standard for tensile strength is GB / T3916-2013; the reference standard for the bamboo-style design is 20-25 bamboo sections per 20×20cm area, with fewer than 20-25 sections indicating thinner bamboo sections and more than 20-25 sections indicating thicker bamboo sections. The reference standard for the blank-textured design is the blank texture of a single flax fiber; the reference standard for anti-pilling grade is GB / T4802.3-2008; the test standard for moisture absorption is GB / T21655.1-2023; and the test method or reference standard for air permeability is GB / T5435-2025.

[0061] Table 1 Performance of Examples and Comparative Examples

[0062] As shown in Table 1, considering the bamboo joint and blank space effects, Example 1 has the best performance, which is in line with the concept of moisture absorption, breathability, dryness and comfort for spring and summer clothing.

[0063] In Comparative Example 1, the linen proportion was too high, resulting in a noticeable negative space style, but the fabric surface lacked clarity, had many linen grains, and was rough. In Comparative Example 2, the 40D polyester filament was too coarse, and the covering yarn was too stiff; the linen proportion was too low, and the negative space style of the fabric surface was not obvious, failing to meet the expected requirements. In Comparative Example 3, linen fibers were blended with cotton and silk instead of a strip blend, resulting in a uniform fiber mixture, but the negative space style of the linen was not obvious, and the fabric surface texture was weak. In Comparative Example 4, without polyester filament covering, the yarn strength was low, the evenness was poor, and the fabric surface was not smooth; the linen proportion was high, with many linen grains, and the fabric was rough. In Comparative Example 5, multi-strand network filaments were used instead of single-strand filaments, resulting in acceptable slub joints and negative space style, but the fabric surface felt soft and limp, not meeting the requirements for the structure and texture of spring and summer fabrics.

[0064] In summary, this invention optimizes the blending process to achieve uniform mixing of various fibers, effectively reducing yarn defects such as hemp fibers and cotton knots, improving yarn evenness, and resulting in a smooth and flat fabric surface after subsequent weaving. Furthermore, the use of a single-hole polyester filament overlay process further optimizes yarn evenness, reduces exposed fuzz, and significantly improves yarn strength, fundamentally solving the defects of flax fibers such as easy breakage and itching when worn. The layered blending and segmented feeding create a natural white visual effect, combined with an irregular three-dimensional slub structure to create a unique yarn texture, resulting in a highly recognizable product appearance while fully preserving the advantages of flax fibers such as moisture absorption, breathability, and the original feel of linen. The yarn blends the soft feel of cotton, the elegant luster of silk, and the cool touch of linen, while the outer layer of single-hole polyester filament eliminates the itching problem, achieving a skin-friendly and breathable fabric. The composite yarn exhibits significantly improved breaking strength, greatly reducing the probability of yarn breakage during weaving, and possesses excellent abrasion resistance and anti-pilling properties, effectively extending the fabric's lifespan.

[0065] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing short-fiber flax slub yarn-wrapped polyester single-hole filament composite yarn, characterized in that, Includes the following steps: Cotton staple fiber and silk staple fiber are mixed, combined, combed, needle combed and drawn in sequence to obtain cotton and silk sliver; After the dried flax is cured and processed, it is combed and needle combed in sequence to obtain flax strips. Cotton and silk slivers are alternately combined with linen slivers to produce a blank-blend blended sliver. The blank blended sliver is processed into roving and spun into slub blended yarn in sequence to obtain blank slub blended yarn; The non-networked polyester single-hole filament is spirally wrapped in the outer surface of the blank slub blended yarn, and then formed by winding and molding to obtain short fiber flax slub yarn wrapped with polyester single-hole filament composite yarn. The short-fiber flax slub yarn-covered polyester single-hole filament composite yarn is composed of the following components by weight: 50-60 parts cotton short fiber, 10-15 parts silk short fiber, 20-25 parts flax fiber, and 10-11 parts non-networked polyester single-hole filament. Intermittent merging uses 8-10 slivers, with 2-3 merging processes. The basis weight of the blended sliver with blank space is 15-16g / 5m, and the draw ratio is 6.0-8.2 times. The fineness of the non-networked polyester single-hole filament is 30D; The feed tension of the non-networked polyester single-hole filament in the co-directional spiral coating is 10-15 cN.

2. The method for preparing short-fiber flax slub yarn-covered polyester single-hole filament composite yarn as described in claim 1, characterized in that, The cotton staple fiber has a fiber length of 37-39 mm, and the silk staple fiber has a fiber length of 40-45 mm. The fiber length of the flax fiber is 40-50 mm.

3. The method for preparing short-fiber flax slub yarn-covered polyester single-hole filament composite yarn as described in claim 1, characterized in that, The quantitative amount of the cotton silk sliver is 15-18g / 5m, and the quantitative amount of the flax sliver is 17-18.5g / 5m.

4. The method for preparing short-fiber flax slub yarn-covered polyester single-hole filament composite yarn as described in claim 1, characterized in that, The base yarn spun from the slub yarn has a count of 40-48 NM, a twist of 600-650 twists / m, a slub ratio of 1.7-2.4, and a slub length of 5-8 cm.

5. The method for preparing short-fiber flax slub yarn-covered polyester single-hole filament composite yarn as described in claim 1, characterized in that, The twist of the short-fiber flax slub yarn-covered polyester single-hole filament composite yarn is 650-750 twists / m, and the production speed is 20-30m / min.

6. A composite yarn of short-fiber flax slub yarn covered with polyester single-hole filaments, prepared by the method of any one of claims 1-5.

7. The short-fiber flax slub yarn-covered polyester single-hole filament composite yarn as described in claim 6, characterized in that, The short-fiber flax slub yarn-covered polyester single-hole filament composite yarn includes a core yarn and a surface spirally covered polyester single-hole filament; the core yarn is a slub blended yarn with a blank surface.

8. The application of the short-fiber flax slub yarn-wrapped polyester single-hole filament composite yarn as described in claim 6 or 7 in clothing fabrics and home textile decorative fabrics.

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