Composite yarn and method for producing the same, and composite yarn production apparatus

Abstract

The application relates to a composite yarn and a preparation method and production equipment thereof. The composite yarn comprises a core layer spun by first fibers, an intermediate layer spun by second fibers and a sheath layer spun by third fibers, and the first fibers, the second fibers and the third fibers are different. The intermediate layer is coated on the outside of the core layer, and the sheath layer is coated on the outside of the intermediate layer. The composite yarn can better simultaneously reflect the advantages of different fibers.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of yarn spinning, in particular to a composite yarn, a preparation method thereof and a composite yarn production device. BACKGROUND

[0002] Different fibers have different advantages and disadvantages. For example, the characteristics of cotton fibers are good moisture absorption and air permeability, soft hand feeling and comfortable wearing, but lack of elasticity and easy to wrinkle; the characteristics of polyester fibers are high strength, good wear resistance and good elasticity, but easy to produce static electricity, poor water absorption and easy to pilling; the characteristics of hemp fibers are antibacterial and strong moisture absorption, but rough and hard in hand feeling; the characteristics of wool fibers are good warmth retention, but easy to produce an abnormal feeling when wearing. Blending is a technology of spinning yarn by mixing different types of fibers. Through blending, different fibers can achieve certain advantages and disadvantages, but the improvement effect is relatively limited. SUMMARY

[0003] Therefore, it is necessary to provide a composite yarn, a preparation method thereof and a composite yarn production device. The composite yarn of the present application can better reflect the advantages of different fibers at the same time.

[0004] In a first aspect, the present application provides a composite yarn, comprising a core layer spun from a first fiber, an intermediate layer spun from a second fiber and a sheath layer spun from a third fiber, wherein the first fiber, the second fiber and the third fiber are different.

[0005] The intermediate layer is wrapped on the outside of the core layer, and the sheath layer is wrapped on the outside of the intermediate layer.

[0006] In some embodiments, the linear density of the composite yarn is 5.905 tex to 73.81 tex.

[0007] In some embodiments, the twist factor of the composite yarn is 200 tpm to 360 tpm.

[0008] In some embodiments, the mass fraction of the core layer is 5 parts to 50 parts, the mass fraction of the intermediate layer is 5 parts to 30 parts, and the mass fraction of the sheath layer is 50 parts to 95 parts.

[0009] In some embodiments, the first fiber, the second fiber and the third fiber are each independently selected from at least one of cotton fibers, hemp fibers, wool fibers and synthetic fibers.

[0010] In a second aspect, the present application provides a preparation method of a composite yarn, comprising the following steps:

[0011] The first fiber, the second fiber and the third fiber are made into a first slubbing, a second slubbing and a third slubbing respectively, and the first fiber, the second fiber and the third fiber are different;

[0012] The first slubbing and the second slubbing are subjected to bundling, drafting and spinning to form a composite slubbing, and in the composite slubbing, the first slubbing has a groove on the surface, and the second slubbing is filled in the groove;

[0013] The third slubbing is subjected to drafting and twisting to form a first roving;

[0014] The first roving is placed in the composite slubbing, and the second slubbing is exposed on the surface of the groove, and the composite slubbing is subjected to common bundling, drafting and twisting to form a composite roving; and

[0015] The composite roving is subjected to spinning to form a composite yarn.

[0016] In some embodiments, the number of the first slubbing and the second slubbing is 6-12.

[0017] In some embodiments, the number of the second slubbing is less than the number of the first slubbing.

[0018] In some embodiments, the drafting multiple of the composite slubbing is 4-8.5.

[0019] In some embodiments, the weight of the composite slubbing is 20-80 g / 10 m.

[0020] In some embodiments, the weight of the first roving is 4-11 g / 10 m.

[0021] In some embodiments, the twist factor of the first roving is 35-75 tpm.

[0022] In some embodiments, the twist direction of the first roving is the same as or opposite to that of the composite roving.

[0023] In some embodiments, the weight of the composite roving is 3.5-9.5 g / 10 m.

[0024] In some embodiments, the drafting multiple of the composite roving is 4-12.

[0025] In some embodiments, the twist factor of the composite roving is 65-110 tpm.

[0026] In a third aspect, the present application provides a composite yarn production equipment for preparing a composite yarn by using the preparation method of any one of the above, comprising: a first drawing device, a second drawing device, a first roving device, a second roving device and a spinning device connected in sequence.

[0027] The first drawing device is used for preparing first slubbing, second slubbing and third slubbing from the first fiber, the second fiber and the third fiber respectively, and the first fiber, the second fiber and the third fiber are different;

[0028] The second drawing device is used for collecting, drafting and spinning the first slubbing and the second slubbing into a composite slubbing, and in the composite slubbing, the first slubbing has a groove on the surface, and the second slubbing is filled in the groove;

[0029] The first roving device is used for drafting and twisting the third slubbing to obtain a first roving;

[0030] The second roving device is used for placing the first roving in the composite slubbing, and the second slubbing is exposed on the surface of the groove, and the first roving and the second slubbing are collectively collected, drafted and twisted to obtain a composite roving;

[0031] The spinning device is used for spinning the composite roving to obtain a composite yarn.

[0032] In some embodiments, the second drawing device comprises a positioner, and the positioner is used for positioning the relative positions of the first slubbing and the second slubbing, so that in the composite slubbing, the first slubbing has a groove on the surface, and the second slubbing is filled in the groove.

[0033] In the above-mentioned three-layer structure composite yarn, the middle layer is wrapped on the outside of the core layer, the sheath layer is wrapped on the outside of the middle layer, and each layer is obtained by spinning different fibers. The composite fiber can not only exert the functionality of the internal fiber, but also exert the advantages of the outer fiber. The composite yarn can better reflect the advantages of different fibers at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A structure schematic diagram of a composite yarn provided by an embodiment of the present application;

[0035] Figure 2 A structure schematic diagram of a composite slubbing provided by an embodiment of the present application;

[0036] Figure 3 A schematic diagram of the stacking mode of the first roving and the composite slubbing provided by an embodiment of the present application;

[0037] Figure 4 A structure schematic diagram of a positioner provided by an embodiment of the present application;

[0038] Figure 5 A structure schematic diagram of a second doubling device provided by an embodiment of the present application;

[0039] Figure 6 A structure schematic diagram of a second roving device provided by an embodiment of the present application.

[0040] Legend of reference signs

[0041] 10, sheath layer; 20, intermediate layer; 30, core layer; 40, composite package; 41, first package; 42, second package; 43, first roving; 100, positioner; 101, guide column; 102, guide rod; 1021, first arc-shaped member; 1022, second arc-shaped member; 201, input can; 202, output can; 301, guide; 302, first guide roller; 303, first guide condition; 400, first drafting roller; 500, first drafting roller; 600, first buncher; 700, second drafting roller; 800, second drafting roller; 900, second buncher. DETAILED DESCRIPTION

[0042] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application are described in detail below. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many different ways other than the ways described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0045] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an implied order of magnitude. Thus, features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0046] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] Reference Figure 1 An embodiment of the present application provides a composite yarn, which comprises a core layer 30 obtained by spinning a first fiber, an intermediate layer 20 obtained by spinning a second fiber, and a sheath layer 10 obtained by spinning a third fiber, the first fiber, the second fiber and the third fiber being different. The intermediate layer 20 is wrapped on the outside of the core layer 30, and the sheath layer 10 is wrapped on the outside of the intermediate layer 20.

[0048] In the above-mentioned three-layer structure composite yarn, the intermediate layer 20 is wrapped on the outside of the core layer 30, the sheath layer 10 is wrapped on the outside of the intermediate layer 20, and each layer is obtained by spinning different fibers. The composite fiber can not only exert the functionality of the internal fiber, but also exert the advantages of the outer fiber. The composite yarn can better reflect the advantages of different fibers at the same time. Further, by selecting different fibers, for example, wrapping the fiber with poor comfort in the middle of the yarn and setting the fiber with good comfort on the outside of the yarn, both the functionality of the internal fiber and the comfort of the external fiber contacting the skin can be taken into account.

[0049] In some embodiments, the linear density of the composite yarn is 5.905tex~73.81tex. Alternatively, the linear density of the composite yarn is 5.905tex, 7.382tex, 9.227tex, 14.76tex, 18.45tex, 29.53tex, 36.91tex or 73.81tex.

[0050] In some embodiments, the composite yarn has a twist factor of 200 tpm to 360 tpm. Alternatively, the composite yarn has a twist factor of 200 tpm, 210 tpm, 220 tpm, 230 tpm, 240 tpm, 250 tpm, 260 tpm, 270 tpm, 280 tpm, 290 tpm, 300 tpm, 310 tpm, 320 tpm, 330 tpm, 340 tpm, 350 tpm, or 360 tpm.

[0051] In some embodiments, the core layer 30 has a mass fraction of 5 parts to 50 parts, the intermediate layer 20 has a mass fraction of 5 parts to 30 parts, and the sheath layer 10 has a mass fraction of 50 parts to 95 parts. Within the ranges of the mass fractions of the core layer 30, the intermediate layer 20, and the sheath layer 10, the effect of taking the advantages of different fibers among the layers is better. Alternatively, the core layer 30 has a mass fraction of 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, or 50 parts. Alternatively, the intermediate layer 20 has a mass fraction of 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, or 30 parts. Alternatively, the sheath layer 10 has a mass fraction of 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, or 95 parts.

[0052] In some embodiments, the first fiber, the second fiber, and the third fiber are each independently selected from at least one of cotton fiber, hemp fiber, wool fiber, and synthetic fiber.

[0053] Yet another embodiment of the present application provides a method for preparing a composite yarn, comprising the following steps: preparing a first roving 41, a second roving 42, and a third roving from a first fiber, a second fiber, and a third fiber, respectively, the first fiber, the second fiber, and the third fiber being different. The first roving 41 and the second roving 42 are subjected to bundling, drafting, and spinning to form a composite roving 40, in which the first roving 41 has a groove on the surface, and the second roving 42 is filled in the groove. The third roving is subjected to drafting and twisting to obtain a first yarn 43. The first yarn 43 is placed in the composite roving 40 such that the second roving 42 is exposed on the surface of the groove, and the composite roving is subjected to common bundling, drafting, and twisting to obtain a composite yarn. The composite yarn is subjected to spinning to obtain a composite yarn.

[0054] Reference Figure 2 and 3In the method for preparing the composite yarn, the first slub yarn 41 and the second slub yarn 42 are first bundled, drafted, and spun into a composite slub yarn 40. In the composite slub yarn 40, the first slub yarn 41 has a groove on the surface, and the second slub yarn 42 is filled in the groove. After obtaining the composite slub yarn 40 with the structure, the first roving 43 is placed on the surface of the second slub yarn 42 exposed from the groove in the composite slub yarn 40, and then the composite roving with a three-layer covering structure is obtained through bundling, drafting, and twisting.

[0055] In some embodiments, the number of the first slub yarn 41 and the second slub yarn 42 is 6-12. Optionally, the number of the first slub yarn 41 and the second slub yarn 42 is 6, 7, 8, 9, 10, 11, or 12.

[0056] In some embodiments, the number of the second slub yarn 42 is less than the number of the first slub yarn 41. For example, the number of the first slub yarn 41 is 4, and the number of the first slub yarn 41 is 2. Alternatively, the number of the first slub yarn 41 is 6, and the number of the first slub yarn 41 is 3. Alternatively, the number of the first slub yarn 41 is 8, and the number of the first slub yarn 41 is 4. Alternatively, the number of the first slub yarn 41 is 6, and the number of the first slub yarn 41 is 2. Alternatively, the number of the first slub yarn 41 is 8, and the number of the first slub yarn 41 is 3.

[0057] In some embodiments, the draft ratio of the composite slub yarn 40 is 4-8.5. Optionally, the draft ratio of the composite slub yarn 40 is 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, or 8.5.

[0058] In some embodiments, the weight of the composite slub yarn 40 is 20-80 g / 10 m. Optionally, the weight of the composite slub yarn 40 is 20 g / 10 m, 25 g / 10 m, 30 g / 10 m, 35 g / 10 m, 40 g / 10 m, 45 g / 10 m, 43 g / 10 m, 55 g / 10 m, 60 g / 10 m, 65 g / 10 m, 70 g / 10 m, 75 g / 10 m, or 80 g / 10 m.

[0059] In some embodiments, the weight of the first roving is 4-11 g / 10 m. Optionally, the weight of the first roving is 4 g / 10 m, 4.5 g / 10 m, 5 g / 10 m, 5.5 g / 10 m, 6 g / 10 m, 6.5 g / 10 m, 7 g / 10 m, 7.5 g / 10 m, 8 g / 10 m, 8.5 g / 10 m, 9 g / 10 m, 9.5 g / 10 m, 10 g / 10 m, 10.5 g / 10 m, or 11 g / 10 m.

[0060] In some embodiments, the first roving 43 has a twist factor of 35 tpm to 75 tpm. Optionally, the first roving 43 has a twist factor of 35 tpm, 40 tpm, 45 tpm, 50 tpm, 55 tpm, 60 tpm, 65 tpm, 70 tpm, or 75 tpm. It is to be understood that the twist direction of the first roving 43 can be either “S” or “Z”.

[0061] In some embodiments, the composite roving has a basis weight of 3.5 g / 10 m to 9.5 g / 10 m. Optionally, the composite roving has a basis weight of 3.5 g / 10 m, 4 g / 10 m, 4.5 g / 10 m, 5 g / 10 m, 5.5 g / 10 m, 6 g / 10 m, 6.5 g / 10 m, 7 g / 10 m, 7.5 g / 10 m, 8 g / 10 m, 8.5 g / 10 m, 9 g / 10 m, or 9.5 g / 10 m.

[0062] In some embodiments, the composite roving has a draft ratio of 4 to 12. Optionally, the composite roving has a draft ratio of 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, or 12.

[0063] In some embodiments, the composite roving has a twist factor of 65 tpm to 110 tpm. Optionally, the composite roving has a twist factor of 65 tpm, 70 tpm, 75 tpm, 80 tpm, 85 tpm, 90 tpm, 95 tpm, 100 tpm, 105 tpm, or 110 tpm. It is to be understood that the twist direction of the composite roving can be either “S” or “Z”.

[0064] In some embodiments, the twist direction of the first roving 43 is “S” and the twist direction of the composite roving is “S”.

[0065] In some embodiments, the twist direction of the first roving 43 is “S” and the twist direction of the composite roving is “Z”.

[0066] In some embodiments, the twist direction of the first roving 43 is “Z” and the twist direction of the composite roving is “S”.

[0067] In some embodiments, the twist direction of the first roving 43 is “Z” and the twist direction of the composite roving is “Z”.

[0068] In some embodiments, the first fiber, the second fiber and the third fiber are respectively prepared into the first roving 41, the second roving 42 and the third roving by the following steps: the first fiber, the second fiber and the third fiber are respectively prepared into first slivers, second slivers and third slivers by a carding process. The first slivers, the second slivers and the third slivers are respectively spun into the first roving 41, the second roving 42 and the third roving by a drawing process.

[0069] In some embodiments, the first fiber, the second fiber and the third fiber are respectively prepared into the first roving 41, the second roving 42 and the third roving by the following steps: the first fiber, the second fiber and the third fiber are respectively prepared into first slivers, second slivers and third slivers by a carding process. The first slivers, the second slivers and the third slivers are respectively spun into the first roving 41, the second roving 42 and the third roving by a drawing process.

[0070] In some embodiments, the second drawing device comprises a positioner 100, the positioner 100 is configured to position the relative positions of the first roving 41 and the second roving 42, so that in the composite roving 40, the first roving 41 has a groove on the surface, and the second roving 42 is filled in the groove.

[0071] Referring to Figure 4 In some embodiments, the positioner 100 comprises a plurality of spacer arranged guide columns 101, and a guide rod 102 located at the interval between adjacent guide columns 101, the guide rod 102 is connected to the guide column 101. In actual use, the first roving 41 passes below the guide rod 102 between the guide columns 101, and the second roving 42 passes above the guide rod 102 between the guide columns 101, so that the first roving 41 and the second roving 42 can be stacked up and down.

[0072] In some embodiments, the guide rod 102 comprises a first arc member 1021 and a second arc member 1022, the convex sides of the first arc member 1021 and the second arc member 1022 are oppositely spaced.

[0073] Referring to Figure 5In some embodiments, the second drawing device comprises an input can 201, an output can 202, a guide bar 301, a guide bar roller, a guide condition 303, a first drawing roller 400, a first drawing roller 500, and a first collector 600 arranged on the frame. The input can 201 is used to input the first slub yarn 41 and the second slub yarn 42 to the guide bar 301. The guide bar 301 is connected to the input end of the positioner 100, and is used to guide the first slub yarn 41 and the second slub yarn 42 into the positioner 100. The guide condition 303 and the first guide bar roller 302 are arranged on the guide bar 301, and are used for guiding the first slub yarn 41 and the second slub yarn 42. The first drawing roller 400 and the first drawing roller 500 are arranged opposite to each other and at the output end of the positioner 100, and are used to draw the first slub yarn 41 and the second slub yarn 42 through the positioner 100. The first collector 600 is arranged at the output end of the positioner 100, and is used to collect the first slub yarn 41 and the second slub yarn 42 through the positioner 100. The output can 202 is used to receive the drawn and collected composite slub yarn 40.

[0074] Reference Figure 6 In some embodiments, the second roving device comprises a second drawing roller 700, a second drawing roller 800, and a second collector 900 arranged on the frame. The second drawing roller 700 and the second drawing roller 800 are arranged opposite to each other, and are used to draw the first roving 43 and the composite slub yarn 40. The second collector 900 is used to collect the first roving 43 and the composite slub yarn 40.

[0075] The following is a specific embodiment

[0076] Method for preparing composite yarn

[0077] (1) Hollow polyester staple fibers are used as the third fibers, cotton staple fibers are used as the first fibers, and high-humidity modulus crimping fibers are used as the second fibers. The first fibers, the second fibers, and the third fibers are processed into first slivers, second slivers, and third slivers according to conventional opening and carding processes. The dry weight of the third sliver is 40 g / 10 m, the dry weight of the first sliver is 50 g / 10 m, and the dry weight of the second sliver is 40 g / 10 m.

[0078] (2) The cotton sliver, the high-humidity modulus crimping sliver, and the hollow polyester sliver are spun into cotton semi-slub yarns, high-humidity modulus crimping semi-slub yarns, and hollow polyester semi-slub yarns through drawing. The parameters of this drawing process are shown in Table 1 below:

[0079] Table 1

[0080]

[0081] (3) The hollow polyester semi-cone is drafted into a hollow polyester cone, which is fed in eight roots with a dry weight of 50 g / 10 m and a draft ratio of 6.15, and an out-draft dry weight of 65 g / 10 m. Using the second drafting device, four high-humidity modulus crimping cones are passed through the gap between the first arc 1021 and the second arc 1022, and eight cotton cones are passed through the gap between the guide columns 101 and below the guide rods 102. The four high-humidity modulus crimping cones and the eight cotton cones are arranged in a "convex" structure on the positioner 100, and after the bunching action of the first buncher 600 and the drafting action of the first drafting roller 400 and the first drafting roller 500, a composite cone 40 is formed. In the composite cone 40, the surface of the cotton cone has a groove, and the high-humidity modulus crimping cone is filled in the groove. The parameters of this drafting process are shown in Table 2 below:

[0082] Table 2

[0083]

[0084] (4) The hollow polyester cone is spun into a hollow polyester roving on a roving machine, and the hollow polyester roving has a dry weight of 8.8 g / 10 m, a draft ratio of 7.39 times, a twist factor of 56 tpm, and a twist direction of Z twist.

[0085] (5) Using the second roving device, the composite cone 40 and the hollow polyester roving are arranged in an upper and lower structure, with the hollow polyester roving located above the center of the composite cone 40. After drafting by the second drafting roller 700 and the second drafting roller 800, bunching by the second buncher 900, and twisting, a three-component composite roving is obtained, with the hollow polyester fiber as the core layer 30, the cotton fiber as the sheath layer 10, and the high-humidity modulus crimping fiber as the intermediate layer 20. The dry weight of the composite roving is 8 g / 10 m, the draft ratio is 11.1, the twist direction is Z twist, and the twist factor is 95 tpm.

[0086] (6) The composite roving is subjected to a spinning process, with a twist direction of Z twist, a twist factor of 300 tpm, a yarn linear density of 29.53 tex (Ne20), and a draft ratio of 30.1. In the spinning process, the roller gauge is 44.5 mm x 62 mm, the speed is 10,000 rpm, the gauge block is 3.75 mm, the ring is 4#, and the twist is 525.

[0087] In the composite yarn prepared in this example, the hollow polyester fiber is the core layer 30 with a mass percentage of 10%; the high-humidity modulus crimping fiber is the intermediate layer 20 with a mass percentage of 25%; and the cotton fiber is the sheath layer 10 with a mass percentage of 65%. The composite yarn prepared in this example can achieve the effect of taking the advantages of different fibers and making up for the disadvantages, and has the advantages of soft and fluffy hand feeling, warm and comfortable, good moisture absorption and air permeability.

[0088] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application encompasses all such possible combinations.

[0089] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims, and the description and drawings can be used to explain the content of the claims.

Claims

1. A method of making a composite yarn, characterized by, The method comprises the following steps: The first fiber, the second fiber and the third fiber are made into a first slubbing, a second slubbing and a third slubbing respectively, the first fiber is cotton short fiber, the second fiber is high wet modulus crimp fiber, and the third fiber is hollow polyester short fiber; The first slubbing and the second slubbing are subjected to bundling, drafting and spinning to form a composite slubbing, in the composite slubbing, the first slubbing has grooves on the surface, and the second slubbing is filled in the grooves; The third slubbing is drafted and twisted to form a first roving; The first roving is placed in the composite slubbing, and the second slubbing is exposed on the surface of the grooves, and the first roving and the second slubbing are subjected to joint bundling, drafting and twisting to form a composite roving; And The composite roving is spun to form a composite yarn, the composite yarn comprises a core layer spun from the first fiber, an intermediate layer spun from the second fiber and a sheath layer spun from the third fiber, the linear density of the composite yarn is 5.905tex~73.81tex, and the twist factor of the composite yarn is 200tpm~360tpm.

2. The method of claim 1, wherein the composite yarn is prepared by a process comprising: The number of the first slubbing and the second slubbing is 6~12; and / or, The number of the second slubbing is less than that of the first slubbing; and / or, The drafting multiple of the composite slubbing is 4~8.5; and / or, The weight of the composite slubbing is 20g / 10m~80g / 10m.

3. The method of claim 2, wherein the core yarn is prepared by a method comprising the steps of: The weight of the first roving is 4g / 10m~11g / 10m; and / or, The twist factor of the first roving is 35tpm~75tpm; and / or, The twist direction of the first roving is the same as or opposite to that of the composite roving.

4. The method of claim 2, wherein the core yarn is prepared by a process comprising the steps of: The weight of the composite roving is 3.5g / 10m~9.5g / 10m; and / or, The drafting multiple of the composite roving is 4~12; and / or, The twist factor of the composite roving is 65tpm~110tpm.

5. A composite yarn prepared by the method of any one of claims 1 to 4, characterized in that, The composite yarn comprises a core layer spun from the first fiber, an intermediate layer spun from the second fiber and a sheath layer spun from the third fiber, the first fiber is cotton short fiber, the second fiber is high wet modulus crimp fiber, and the third fiber is hollow polyester short fiber; The intermediate layer is wrapped outside the core layer, and the sheath layer is wrapped outside the intermediate layer; The linear density of the composite yarn is 5.905tex~73.81tex, and the twist factor of the composite yarn is 200tpm~360tpm.

6. The composite yarn of claim 5, wherein, The mass fraction of the core layer is 5~50 parts, the mass fraction of the intermediate layer is 5~30 parts, and the mass fraction of the sheath layer is 50~95 parts.

7. A composite yarn production apparatus characterized by comprising: The method for preparing the composite yarn by the preparation method of any one of claims 1~4 comprises a first drawing device, a second drawing device, a first roving device, a second roving device and a spinning device connected in sequence. The first drawing device is used for drawing the first fiber, the second fiber and the third fiber to obtain a first slubbing, a second slubbing and a third slubbing respectively, the first fiber is cotton short fiber, the second fiber is high wet modulus crimp fiber, and the third fiber is hollow polyester short fiber; The second drawing device is used for bundling, drafting and spinning the first slubbing and the second slubbing to obtain a composite slubbing, in the composite slubbing, the first slubbing has a groove on the surface, and the second slubbing is filled in the groove; The first roving device is used for drafting and twisting the third slubbing to obtain a first roving; The second roving device is used for placing the first roving in the composite slubbing, and the second slubbing is exposed on the surface of the groove, and the first roving and the second slubbing are collectively bundled, drafted and twisted to obtain a composite roving; The spinning device is used for spinning the composite roving to obtain a composite yarn.

8. The composite yarn production apparatus according to claim 7, characterized by The second drawing device comprises a positioner, and the positioner is used for positioning the relative positions of the first slubbing and the second slubbing, so that in the composite slubbing, the first slubbing has a groove on the surface, and the second slubbing is filled in the groove.

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