Composite yarn, fabric and preparation method of composite yarn

Abstract

The invention discloses a composite yarn, a fabric and a preparation method of the composite yarn. The composite yarn contains short fibers and filaments, and the weight ratio of the short fibers to the filaments is 90: 10-40: 60. The short fibers are hollow short fibers and / or core-sheath composite short fibers, the core component in the core-sheath composite short fibers is an alkali-soluble polymer, and a part of the core component is exposed out of the surfaces of the core-sheath composite short fibers; the filament is a hollow filament and / or a core-sheath composite filament, a core component in the core-sheath composite filament is an alkali-soluble polymer, and a part of the core component is exposed out of the surface of the core-sheath composite filament. The fabric obtained by using the composite yarn for spinning and carrying out decrement treatment has strong light weight feeling and good wear resistance, and can be widely applied to various fabrics such as woven fabrics, knitted fabrics and the like.

Description

Technical Field

[0001] The present invention relates to a composite yarn, a fabric and a preparation method thereof, and in particular to a lightweight, wear-resistant long and short composite yarn, and a fabric obtained by weaving the composite yarn and then subjecting it to a weight reduction treatment. Background Art

[0002] With the development of the market and the continuous improvement of living standards, people's requirements for clothing are getting higher and higher. They not only require it to be wrinkle-resistant, breathable, and heat-insulating, but also lightweight.

[0003] Chinese patent CN105326094A discloses a lightweight, thermally insulating knitted fabric comprised of a blended yarn containing hollow polyester staple fibers and one or more of viscose, cotton, and wool fibers. The hollow polyester staple fibers account for 30-50% of the total weight of the knitted fabric. Because the knitted fabric is composed entirely of staple fibers and contains a relatively low content of hollow polyester staple fibers, the overall knitted fabric lacks a lightweight feel and exhibits poor wear resistance.

[0004] Chinese patent CN202786605U discloses a composite spun yarn and a woven fabric thereof. The composite spun yarn comprises a hollow synthetic fiber multifilament A and an ultrafine acrylic staple fiber B, with a weight ratio of A to B ranging from 5:95 to 40:60. Because the hollow portion of the filament is easily flattened during weaving, the woven fabric has a low hollow ratio and a lack of lightweight feel. Summary of the Invention

[0005] The object of the present invention is to provide a composite yarn with a strong lightness and good wear resistance, and a lightweight and wear-resistant fabric obtained by weaving the composite yarn and then subjecting it to a weight reduction treatment.

[0006] The technical solution of the present invention is:

[0007] A composite yarn contains staple fibers and filaments, wherein the weight ratio of the staple fibers to the filaments is 90:10 to 40:60; the staple fibers are hollow staple fibers and / or core-sheath composite staple fibers, wherein the core component in the core-sheath composite staple fibers is an alkali-soluble polymer, and a portion of the core component is exposed on the surface of the core-sheath composite staple fibers; the filaments are hollow filaments and / or core-sheath composite filaments, wherein the core component in the core-sheath composite filaments is an alkali-soluble polymer, and a portion of the core component is exposed on the surface of the core-sheath composite filaments.

[0008] The hollow ratios of the hollow short fibers and hollow filaments are preferably 20 to 50%, respectively.

[0009] In the cross section of the core-sheath composite staple fiber and the core-sheath composite filament, the core component area preferably accounts for 30 to 65% of the total cross-sectional area.

[0010] The short fibers are preferably hollow short fibers, and the filaments are preferably core-sheath composite filaments.

[0011] The present invention also discloses a fabric, which contains composite yarns with special cross-sections, and the composite yarns with special cross-sections contain short fibers with hollow cross-sections and / or short fibers with C-shaped cross-sections, as well as filaments with hollow cross-sections and / or filaments with C-shaped cross-sections.

[0012] The fabric is preferably obtained by weaving more than 70 wt% of the composite yarn and then undergoing a weight reduction treatment.

[0013] The present invention selects hollow staple fibers and / or core-sheath composite staple fibers whose core components are alkali-soluble polymers, and composites them with hollow filaments and / or core-sheath composite filaments whose core components are alkali-soluble polymers to obtain composite yarns. The fabric obtained by weaving the composite yarn and then reducing it has a strong light feel and good wear resistance, and can be widely used in various fabrics such as weaving and knitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the cross section of a hollow fiber.

[0015] Figure 2 Schematic diagram of the cross section of the core-sheath composite fiber.

[0016] Figure 3 Schematic diagram of the cross section of yarn in fabric. DETAILED DESCRIPTION

[0017] The composite yarn of the present invention contains staple fibers and filaments, with the weight ratio of staple fibers to filaments being 90:10 to 40:60. If the staple fiber weight exceeds 90%, the filaments must have a finer single-filament fineness, which increases the difficulty of filament production. Furthermore, the thin sheath of the core-sheath composite filaments or the thin fiber walls of the hollow filaments are easily flattened during spinning and weaving, resulting in a low hollow ratio and weak lightweight filaments. Furthermore, a low filament weight leads to low strength in the composite yarn and reduced abrasion resistance in the fabric. If the staple fiber weight is less than 40%, the cohesion between the staple fibers and the filaments is weak, making them prone to slipping when the composite yarn is subjected to external forces, and also reducing the abrasion resistance of the fabric.

[0018] The hollow fiber is an important type of shaped fiber with a cavity along the axial direction of its cross section. Its characteristic is that the specific gravity is reduced by reducing the weight of the hollow part, thereby achieving a lightweight effect. The core-sheath composite fiber described in the present invention refers to core-sheath composite short fibers and core-sheath composite filaments whose core component is an alkali-soluble polymer and a portion of the core component is exposed on the fiber surface. After weight reduction treatment, C-shaped cross-section short fibers and C-shaped cross-section filaments can be obtained, thereby achieving a better lightweight effect for fabrics made from the composite yarn described in the present invention.

[0019] The hollow ratio of the hollow staple fibers and hollow filaments of the present invention is preferably 20-50%, respectively. If the hollow ratio of the hollow staple fibers and hollow filaments is too small, the lightweight feel of the composite yarn and the fabric formed therefrom will be weak. If the hollow ratio of the hollow staple fibers and hollow filaments is too large, the hollow space will be easily flattened after a series of spinning and weaving processes, reducing the hollow ratio of the hollow staple fibers and hollow filaments and weakening the lightweight feel of the composite yarn and the fabric formed therefrom.

[0020] The present invention does not impose any particular limitation on the hollow shape of the hollow staple fibers and hollow filaments, and the hollow shapes may be any shapes such as circular, triangular, square, elliptical, flat, etc.

[0021] In the cross-section of the core-sheath composite staple fibers and core-sheath composite filaments, the core component area preferably accounts for 30 to 65% of the total cross-sectional area. If the area ratio of the core component is too small, the lightweight properties of the C-section staple fibers and C-section filaments after the weight reduction treatment are weakened; if the area ratio of the core component is too large, the sheath portion of the core-sheath composite staple fibers and core-sheath composite filaments is too thin, and the strength of the C-section staple fibers and C-section filaments after the weight reduction treatment is reduced, and they are prone to breakage, resulting in a decrease in hollow rate, and the resulting fabric has reduced tear strength and weaker lightweight properties.

[0022] The composite yarns of the present invention include nine different combinations, including hollow staple fibers and hollow filaments, hollow staple fibers and core-sheath composite filaments, hollow staple fibers and hollow filaments and core-sheath composite filaments, core-sheath composite staple fibers and hollow filaments, core-sheath composite staple fibers and core-sheath composite filaments, core-sheath composite staple fibers and hollow filaments and core-sheath composite filaments, hollow staple fibers and core-sheath composite staple fibers and hollow filaments, hollow staple fibers and core-sheath composite staple fibers and core-sheath composite filaments, and hollow staple fibers and core-sheath composite staple fibers and hollow filaments and core-sheath composite filaments. Compared with core-sheath composite staple fibers, when hollow staple fibers are used, the strength retention rate of the hollow staple fibers in the fabric produced is better, and deformation and fracture will not occur during friction, that is, the fabric has better wear resistance, and therefore becomes preferred. Compared with hollow filaments, core-sheath composite filaments are C-shaped cross-section filaments with a certain hollow ratio obtained after the composite yarn is spun and then reduced in weight. They will not cause hollow deformation and decrease in hollow ratio during the spinning and weaving process, so they are preferred.

[0023] In summary, the composite yarn of the present invention is preferably a composite yarn formed by hollow staple fibers and core-sheath composite filaments, and the fabric formed by the composite yarn has excellent lightness and wear resistance.

[0024] The present invention does not particularly limit the preparation method of the composite yarn, and the method can be selected as needed. The composite yarn can be obtained by forming short fibers into short fiber bundles on a spinning frame (such as sirofil spinning and compact sirofil spinning) or a vortex spinning frame, and then composite twisting the short fiber bundles with filaments. Alternatively, the composite yarn can be obtained by first combining the short fiber yarn and filaments on a doubling machine and then twisting them on a twisting machine.

[0025] The composite yarn of the present invention can be spun and then subjected to a weight reduction treatment to produce a lightweight, wear-resistant fabric. During weaving, the composite yarn of the present invention can be spun alone or spun together with other yarns. When spun together with other yarns, the amount of the composite yarn used is preferably greater than 70% to ultimately obtain a fabric with superior lightweight properties. The present invention does not particularly limit the other yarns, and they can be selected as needed. Examples include 100% cotton pure spun yarn, 100% polyester pure spun yarn, polyester-cotton blended yarn, 100% viscose pure spun yarn, etc.

[0026] The fabric contains composite yarns with special cross-sections, and the composite yarns with special cross-sections contain hollow cross-section staple fibers and / or C-shaped cross-section staple fibers, as well as hollow cross-section filaments and / or C-shaped cross-section filaments. The C-shaped cross-section staple fibers and C-shaped cross-section filaments are obtained by respectively removing the core component alkali-soluble polymer from the core-sheath composite staple fibers and the core-sheath composite filaments through a reduction treatment. During the reduction treatment, the sodium hydroxide solution starts the reduction treatment from the core component formed by the alkali-soluble polymer exposed on the fiber surface until all the core components are reduced and removed. The C-shaped cross-section staple fibers and C-shaped cross-section filaments after reduction can produce a lightweight effect, and at the same time, the hollow rate of the original hollow staple fibers and hollow filaments will not be affected during the reduction process, because the resulting fabric has an excellent lightweight effect.

[0027] The fabric described in the present invention is not particularly limited and can be either a woven or knitted fabric. Woven fabrics can be plain, twill, satin, duplex, napped, or patterned. Knitted fabrics can be plain, ribbed, purl, variable, variable plain, interlock, or patterned. The fabric can be single-layer or multi-layer, and multi-layer fabrics can be double or more layers.

[0028] In addition, without damaging the fabric, during the finishing process, the feel and appearance of the fabric can be improved through physical, chemical or physical and chemical methods such as stiffening finishing, softening finishing or raising. The quality of the fabric can also be improved and new functions can be given to the fabric through anti-wrinkle, anti-fouling, anti-moth or anti-bacterial methods.

[0029] The present invention forms a lightweight, wear-resistant composite yarn by combining short fibers containing hollow short fibers and / or core-sheath composite short fibers with filaments containing hollow filaments and / or core-sheath composite filaments. The composite yarn can be used to make lightweight, wear-resistant fabrics.

[0030] The present invention is further described below with reference to the following examples and comparative examples, but the present invention is not limited thereto. The various physical parameters involved in the present invention were tested according to the following methods.

[0031] (1) Weight ratio of short fibers and filaments in composite yarns

[0032] Randomly select 20 50cm composite yarn samples and weigh them, recording them as Ga. Adjust the twist meter test gauge to 400mm, take one yarn sample, and untwist the yarn using the direct counting method on the twist meter. Remove the untwisted yarn and then peel off the entire loose short fiber outside the filament, retaining the filament. Use the same method to decompose the short fiber portion of the remaining 19 composite yarns, obtaining a total of 20 filaments, which are weighed and recorded as Gb. The weight ratio of short fiber to filament in the composite yarn is (Ga-Gb):Ga.

[0033] (2) Hollowness rate of hollow short fibers

[0034] Take a composite yarn containing hollow staple fibers, untwist the yarn using the direct counting method on a twist meter, and peel off the hollow staple fibers with tweezers. Stick the hollow staple fibers on both sides of the groove container and inject paraffin wax to form an embedding block. Then trim the paraffin block and slice it, and photograph the obtained paraffin slices under a microscope. The magnification should be such that a photo with clear boundaries can be taken, such as 1000 times. After taking the photo, the paper-cutting method is used to test the hollowness. That is, print the photo, randomly cut out 30 hollow sections, weigh them, and record them as Gc (including the hollow part). Cut out the hollow part of the fiber cut out, weigh the cut hollow part, and record it as Gd. The hollowness of the hollow staple fiber is (Gd / Gc)×100%.

[0035] (3) Hollowness rate of hollow filaments

[0036] Take a composite yarn containing hollow filaments, untwist the yarn using the direct counting method on a twist meter, and peel off the hollow filament part with tweezers. Stick the hollow filaments on both sides of the groove container and inject paraffin to form an embedding block. Then trim the paraffin block and slice it, and photograph the obtained paraffin slices under a microscope. The magnification should be such that a photo with clear boundaries can be taken, such as 1000 times. After taking the photo, the paper-cutting method is used to test the hollow rate. That is, print the photo, randomly cut out 30 hollow sections, weigh them, and record them as Ge (including the hollow part). Cut out the hollow part of the fiber cut out above, weigh the cut hollow part, and record it as Gf. The hollow rate of the hollow filament is (Gf / Ge)×100%.

[0037] (4) The percentage of the core component area in the core-sheath composite staple fiber to the total cross-sectional area

[0038] Take a composite yarn containing core-sheath composite staple fibers, take 10 turns of the yarn using a yarn length meter, and perform alkali reduction treatment on it. After achieving complete reduction, use the direct counting method on the twist meter to untwist the yarn, and use tweezers to peel out the C-shaped cross-section staple fibers. Stick the C-shaped cross-section staple fibers on both sides of the groove container and inject paraffin to form an embedding block. Then trim the paraffin block and slice it, and photograph the obtained paraffin slices under a microscope. The magnification should be such that a photo with clear boundaries can be taken, such as 1000 times. After taking the photo, the paper-cutting method is used to test the percentage of the core component area to the total cross-sectional area. That is, print the photo, randomly cut out 30 C-shaped sections, weigh them, and record them as Gg (including the hollow part). Cut out the hollow part of the C-shaped section fiber, weigh the cut hollow part, and record it as Gh. Since the paper with the same density and thickness is used, the weight ratio is also equivalent to the area ratio. The percentage of the core component area of ​​the core-sheath composite short fiber to the total cross-sectional area is (Gh / Gg)×100%.

[0039] (5) The percentage of the core component area in the core-sheath composite filament to the total cross-sectional area

[0040] Take a composite yarn containing core-sheath composite filaments, take 10 turns of the yarn using a yarn length meter, and perform alkali reduction treatment on it. After achieving complete reduction, use the direct counting method on the twist meter to untwist the yarn, and use tweezers to peel out the C-shaped cross-section filament part. Stick the C-shaped cross-section filaments on both sides of the groove container and inject paraffin to form an embedding block. Then trim the paraffin block and slice it, and photograph the obtained paraffin slices under a microscope. The magnification should be such that a clear boundary can be taken, such as 1000 times. After taking the photos, the paper-cut method is used to test the percentage of the core component area to the total cross-sectional area. That is, print the photo, randomly cut out 30 C-shaped sections, weigh them, and record them as Gi (including the hollow part). Cut out the hollow part of the C-shaped section fiber, weigh the cut hollow part, and record it as Gj. Since the paper with the same density and thickness is used, the weight ratio is also equivalent to the area ratio. The percentage of the core component area of ​​the core-sheath composite filament to the total cross-sectional area is (Gj / Gi)×100%.

[0041] (6) Fabric lightness

[0042] Tested according to JIS L 1096:2010 for height.

[0043] (7) Fabric wear resistance

[0044] The test was conducted according to JIS L 1096:2010E method breakage (Martindale method).

[0045] Example 1

[0046] Hollow staple fiber raw cotton with a fineness of 2.8 dtex and an average length of 38 mm (30% hollowness, manufactured by Toray Industries, Ltd.) was selected and subjected to the following steps: blowroom, carding, drawing, and roving to produce roving. The drawing step involved two draws, an 8x draft, and a basis weight of 20 g / 5 m; the roving step involved a 10x draft, a 0.6 twist factor, and a basis weight of 4.0 g / 10 m. The resulting roving was then composited with 75T core-sheath composite filaments (the core component area accounts for 50% of the total cross-sectional area; the core component of the core-sheath composite staple fibers is an alkali-soluble polymer, with a portion of the core component exposed on the surface of the core-sheath composite staple fibers, manufactured by Toray Industries, Ltd.) using a weight ratio of 70:30. The compact sirofil spinning step involved a rotational speed of 12,000 rpm, a draft of 24x, a twist factor of 3.6, and a filament tension of 10 g, resulting in a 24-count composite yarn of the present invention.

[0047] The long and short composite yarns prepared above were woven into a grey fabric with a 2 / 1 twill weave and a warp density of 117 strands / inch × a weft density of 57 strands / inch. The fabric was then woven through a scouring and bleaching pretreatment (90°C × 20 minutes) → intermediate setting (180°C × 1 minute) → singeing → alkali reduction (solid NaOH, 90°C × 20 minutes) → dyeing (disperse dye DK9Z3, 130°C × 30 minutes) → finishing (softener KQ82, 1 dip and 1 pad process) → drying (130°C × 2 minutes) → setting (170°C × 1 minute) to obtain the woven fabric of the present invention. The performance parameters are shown in Table 1.

[0048] Example 2

[0049] The resulting roving was then composited with 25T core-sheath composite filaments (the core component area accounts for 50% of the total cross-sectional area; the core component of the core-sheath composite staple fibers is an alkali-soluble polymer, with a portion of the core component exposed on the surface of the core-sheath composite staple fibers, manufactured by Toray Industries, Ltd.) at a weight ratio of 90:10. The compact sirofil spinning process employed the following conditions: a rotational speed of 12,000 rpm, a draft ratio of 16x, a twist multiplier of 3.6, and a filament tension of 4g. The remaining conditions were the same as in Example 1, resulting in a 24-count composite yarn and woven fabric of the present invention. Performance parameters are shown in Table 1.

[0050] Example 3

[0051] The resulting roving was composited with two 75T core-sheath composite filaments (the core component area accounts for 50% of the total cross-sectional area; the core component of the core-sheath composite staple fiber is an alkali-soluble polymer, and a portion of the core component is exposed on the surface of the core-sheath composite staple fiber, manufactured by Toray Industries, Ltd.) at a weight ratio of 40:60. The compact sirofil spinning process was as follows: 12,000 rpm, 36x draft, 3.6 twist multiplier, and 10g filament tension. The remaining conditions were the same as in Example 1, resulting in a 24-count composite yarn and woven fabric of the present invention. Performance parameters are shown in Table 1.

[0052] As can be seen from Examples 1 to 3, with other characteristics remaining the same, as the filament ratio increases (Examples 1 and 2), the abrasion resistance of the resulting fabric improves. However, when the filament ratio reaches a certain value (Example 3), the cohesion between the staple fibers and the filaments decreases, and thus the abrasion resistance of the resulting fabric tends to decrease.

[0053] Example 4

[0054] Hollow staple fiber raw cotton (hollow ratio 30%, manufactured by Toray Industries, Ltd.) with a fineness of 2.8 dtex and an average length of 38 mm was selected for compounding with 75T hollow filament (hollow ratio 30%, manufactured by Toray Industries, Ltd.), and the fabric was alkali-reduced (NaOH solid, 120°C × 60 minutes). Otherwise, the same as in Example 1 was used to obtain a 24-ne composite yarn and a woven fabric of the present invention. The performance parameters are shown in Table 1.

[0055] Example 5

[0056] Core-sheath composite staple fiber raw cotton with a fineness of 2.8 dtex and an average length of 38 mm (the core component area accounts for 50% of the total cross-sectional area, the core component in the core-sheath composite staple fiber is an alkali-soluble polymer, and a portion of the core component is exposed on the surface of the core-sheath composite staple fiber, manufactured by Toray Industries, Ltd.) and 75T core-sheath composite filament (the core component area accounts for 50% of the total cross-sectional area, the core component in the core-sheath composite staple fiber is an alkali-soluble polymer, and a portion of the core component is exposed on the surface of the core-sheath composite staple fiber, manufactured by Toray Industries, Ltd.) were selected for compounding. The rest was the same as in Example 1 to obtain the 24-ne composite yarn and woven fabric of the present invention. The performance parameters are shown in Table 1.

[0057] Example 6

[0058] Staple fibers: core-sheath composite staple fiber raw cotton with a fineness of 2.8 dtex and an average length of 38 mm (the core component area accounts for 50% of the total cross-sectional area, the core component in the core-sheath composite staple fiber is an alkali-soluble polymer, and a part of the core component is exposed on the surface of the core-sheath composite staple fiber, manufactured by Toray Industries, Ltd.) and hollow staple fiber raw cotton with a fineness of 2.8 dtex and an average length of 38 mm (hollowness rate of 30%, manufactured by Toray Industries, Ltd.) are mixed in a weight ratio of 50:50, and then roving is obtained through processes such as carding, drawing, and roving.

[0059] Filaments: one 38T core-sheath composite filament (the core component area accounts for 50% of the total cross-sectional area, the core component in the core-sheath composite staple fiber is an alkali-soluble polymer, and part of the core component is exposed on the surface of the core-sheath composite staple fiber, manufactured by Toray Industries, Ltd.) and one 38T hollow filament (hollow ratio 30%, manufactured by Toray Industries, Ltd.).

[0060] The short fibers and filaments were combined and subjected to a sirofil spinning process with a rotational speed of 12,000 rpm, a draft ratio of 24, a twist coefficient of 3.6, and a filament tension of 5 g. The remaining steps were the same as in Example 1 to produce a 24-ne composite yarn and a woven fabric of the present invention. The performance parameters are shown in Table 1.

[0061] It can be seen from Examples 1 and 4 to 6 that, under the condition that other characteristics are the same, as the content of the core-sheath composite fiber increases, the wear resistance of the obtained fabric decreases.

[0062] Examples 7 to 10

[0063] The hollow ratio of the hollow staple fiber raw cotton was changed, and the rest was the same as in Example 1, to obtain the 24 Ne composite yarn and woven fabric of the present invention. The performance parameters are shown in Table 1.

[0064] As can be seen from Examples 1, 7, and 10, with other characteristics remaining the same, as the hollow ratio of the short hollow fibers increases (Examples 1, 7, and 9), the lightweight of the resulting fabric also increases. However, when the hollow ratio of the short hollow fibers reaches a certain value (Examples 8 and 10), the hollow fibers are flattened during the weaving process, and thus the lightweight of the resulting fabric decreases.

[0065] Examples 11 to 14

[0066] The ratio of the core component area to the total cross-sectional area in the core-sheath composite filament was changed, and the rest was the same as in Example 1 to obtain the 24 Ne composite yarn and woven fabric of the present invention. The performance parameters are shown in Table 1.

[0067] As can be seen from Examples 1, 11 to 14, with other characteristics remaining the same, as the proportion of the core component in the core-sheath composite filament to the total cross-sectional area increases (Examples 1, 11, and 13), the lightweight of the resulting fabric also increases. However, when the proportion of the core component in the core-sheath composite filament to the total cross-sectional area reaches a certain value (Examples 12 and 14), the C-section filaments are prone to breakage after the weight reduction treatment, resulting in a decrease in the hollow ratio, and thus the lightweight of the resulting fabric is reduced.

[0068] Example 15

[0069] The proportion of the composite yarn in the fabric was changed, and the other 30 wt% of the yarn in the fabric was 24 Ne pure spun yarn made from Huaxi raw cotton with a fineness of 1.33 dtex and an average length of 38 mm. The rest was the same as in Example 1, and a 24 Ne composite yarn and a woven fabric containing the present invention were obtained. The performance parameters are shown in Table 1.

[0070] It can be seen from Examples 1 and 15 that, under the condition that other characteristics are the same, the fabric containing 100wt% of the composite yarn is lighter than the fabric containing 70wt%.

[0071] Comparative Example 1

[0072] Hollow staple fiber raw cotton with a fineness of 2.8 dtex and an average length of 38 mm (30% hollowness, manufactured by Toray Industries, Ltd.) was selected and sequentially processed through blowrooming, carding, drawing, and roving to produce roving. The drawing process involved two draws, an 8x draft, and a basis weight of 24 g / 5 m; the roving process involved a 6x draft, a 0.6 twist factor, and a basis weight of 8.0 g / 10 m. The resulting roving was then composited with 25T core-sheath composite filaments (the core component area accounts for 50% of the total cross-sectional area; the core component of the core-sheath composite staple fibers is an alkali-soluble polymer, with a portion of the core component exposed on the surface, manufactured by Toray Industries, Ltd.) using compact sirofil spinning at a speed of 12,000 rpm, a draft of 18x, a twist factor of 3.6, and a filament tension of 4 g, resulting in a 12-neon composite yarn.

[0073] The long and short composite yarns prepared above were woven into a grey fabric with a 2 / 1 twill weave and a warp density of 83 strands / inch × a weft density of 40 strands / inch, so that the fabric tightness was the same as in Example 1, to obtain a 12-ne composite yarn and a woven fabric of the present invention. The performance parameters are shown in Table 1.

[0074] Since the filament content is too low, the strength of the composite yarn becomes low and the wear resistance of the final fabric is poor.

[0075] Comparative Example 2

[0076] The resulting roving was composited with two 85T core-sheath composite filaments (the core component area accounts for 50% of the total cross-sectional area; the core component of the core-sheath composite staple fiber is an alkali-soluble polymer, and a portion of the core component is exposed on the surface of the core-sheath composite staple fiber, manufactured by Toray Industries, Ltd.) at a weight ratio of 30:70. The compact sirofil spinning process was as follows: 12,000 rpm, 53x draft, 3.6 twist multiplier, and 12g filament tension. The remaining conditions were the same as in Example 1, resulting in a 24-count composite yarn and woven fabric of the present invention. Performance parameters are shown in Table 1.

[0077] Since the content of filaments in the composite yarn is too high and the content of staple fibers is too low, the cohesive force between the staple fibers and filaments is small, and the resulting fabric has poor wear resistance.

[0078] Comparative Example 3

[0079] Hollow staple fiber raw cotton (30% hollowness, manufactured by Toray Industries, Ltd.) with a fineness of 2.8 dtex and an average length of 38 mm was used and subjected to the following steps: opening and cleaning, carding, drawing, and roving to produce roving. The drawing step involved two draws, an 8x draft ratio, and a basis weight of 20 g / 5 m; the roving step involved a 10x draft ratio, a 0.6 twist factor, and a basis weight of 4.0 g / 10 m. The resulting roving was then composited with 75T-36F solid filament yarn (non-hollow, containing no soluble polymer, manufactured by Toray Industries, Ltd.) using compact Sirofil. The remaining steps were the same as in Example 4, resulting in a 24-ne composite yarn and woven fabric of the present invention. Performance parameters are shown in Table 1.

[0080] Comparative Example 4

[0081] Solid staple cotton (non-hollow, soluble polymer-free, manufactured by Toray Industries, Ltd.) with a fineness of 2.8 dtex and an average length of 38 mm was selected and sequentially subjected to blowroom, carding, drawing, and roving steps to obtain roving. The drawing step included two draws, a draft ratio of 8, and a basis weight of 20 g / 5 m, and the roving step included a draft ratio of 10, a twist factor of 0.6, and a basis weight of 4.0 g / 10 m. The resulting roving was then composited with 75T-36F hollow filaments (hollow ratio 30%, manufactured by Toray Industries, Ltd.) using compact Sirofil. The remaining procedures were the same as in Example 4 to obtain a 24 Ne composite yarn and woven fabric of the present invention. The performance parameters are shown in Table 1.

[0082] In Comparative Examples 3 and 4, since some fibers in the composite yarn are solid fibers, the final fabric has poor lightness.

[0083]

Claims

1. Composite yarns containing staple fibers and filaments, characterized by: The weight ratio of the short fibers and the filaments is 90:10 to 40:60; the short fibers are hollow short fibers and / or core-sheath composite short fibers, the core component in the core-sheath composite short fibers is an alkali-soluble polymer, and a portion of the core component is exposed on the surface of the core-sheath composite short fibers; the filaments are hollow filaments and / or core-sheath composite filaments, the core component in the core-sheath composite filaments is an alkali-soluble polymer, and a portion of the core component is exposed on the surface of the core-sheath composite filaments.

2. The composite yarn according to claim 1, wherein: The hollow ratios of the hollow short fibers and the hollow filaments are respectively 20-50%.

3. The composite yarn according to claim 1, wherein: In the cross section of the core-sheath composite staple fiber and the core-sheath composite filament, the core component area accounts for 30 to 65% of the total cross section area.

4. The composite yarn according to any one of claims 1 to 3, characterized in that: The short fibers are hollow short fibers, and the filaments are core-sheath composite filaments.

5. A fabric characterized by: The fabric contains composite yarns with special cross-sections, and the composite yarns with special cross-sections contain short fibers with hollow cross-sections and / or short fibers with C-shaped cross-sections, as well as filaments with hollow cross-sections and / or filaments with C-shaped cross-sections.

6. The method for preparing the fabric according to claim 5, characterized in that: The fabric is obtained by weaving more than 70 wt% of the composite yarn according to claim 1 and then undergoing a weight reduction treatment.

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