A method of spinning a bicomponent spun yarn

Abstract

The application relates to a spinning method of a two-component blended yarn, which adopts a double-feeding double-separation comb rotor spinning technology, and the two-component blended yarn is composed of first-component fiber segments and second-component fiber segments arranged alternately; first, the ratio S of the length L1 of the first-component fiber segments to the length L2 of the second-component fiber segments in the two-component blended yarn is set, S is not equal to 1, and the types or colors of the first component and the second component are different; then, the included angle lambda between the vertical line C1 of the first-component corresponding fiber outlet and the rotary axis of the rotor and the vertical line C2 of the second-component corresponding fiber outlet and the rotary axis of the rotor is calculated; finally, the feeding mass ratio of the first component to the second component is controlled to be 1:1, the spinning is carried out according to the calculated included angle lambda, and the two-component blended yarn is obtained. The application can realize accurate regulation and control of the interval distance proportion of the two-component fiber segments on the yarn surface, and the obtained yarn strength and yarn evenness are good.

Description

Technical Field

[0001] This invention belongs to the field of spinning and manufacturing technology, and relates to a method for spinning bicomponent blended yarn. Background Technology

[0002] Appearing to be bicomponent yarns with alternating distributions, they possess distinctive visual characteristics, diverse color variations, rich hand feel, and strong design potential. Primarily spun from two different types or colors of fibers, the resulting fabrics can satisfy individual preferences and offer significant economic added value.

[0003] There are four main methods for spinning apparent bicomponent spaced yarns in existing technologies: dyeing and printing, main-auxiliary method, alternating method, and double-feeding double-carding method.

[0004] (1) The printing and dyeing method (e.g., CN202011577504.1) uses dye liquor to dye the yarn segments at intervals. The yarn produced by this method is a type of segmented colored yarn. Due to the limitations of actual production, the length of each colored segment is too long and the ratio of the interval between the two colored segments cannot be precisely controlled. There is also the problem of poor color fastness of the yarn. At the same time, the printing and dyeing method will cause the problem of printing and dyeing wastewater discharge, which will cause environmental pollution to a certain extent.

[0005] (2) The main-auxiliary method (e.g., the literature (Multifunctional three-roller drafting device [C]. Proceedings of the 15th National Symposium on Technological Progress of Fancy Yarns and Fabrics. 2009: 122-123.)) involves setting two rovings on a ring spinning machine. The main roving is continuously fed through the nip of the middle roller, while the auxiliary roving is intermittently fed under the variable frequency motion of the rear roller. Its process characteristics are: one color roving moves continuously while the other color roving moves intermittently, resulting in obvious variations in the thickness of the spun yarn. This method uses a ring spinning machine to spin yarn. Ring spinning technology has disadvantages such as low spinning speed, small package capacity, low degree of automation, and long process flow.

[0006] (3) The alternating method (e.g., the literature (Research on the principle and yarn structure of two-channel differential drafting ring spinning [D]. Jiangnan University, 2019.)) involves feeding two different rovings of different compositions into a spinning machine using two pairs of rollers in an alternating manner. The first roving is broken in the back drafting zone by the drafting action, achieving the alternation of the two rovings. Then, through the differential drafting of the two channels, the tail end of the front roving and the head end of the back roving overlap. Finally, the compact spinning technique is used. The technique involves converging and twisting two rovings in the direction of their cross-section to form a single sliver, thus achieving the overlap of the two rovings. However, this method uses a ring spinning machine to spin yarn, which has disadvantages such as low spinning speed, small package capacity, low degree of automation, and long process flow. In addition, the position of the co-component roving is unstable after the feeding stops, and it is difficult to ensure that the re-fed roving is accurately overlapped. Therefore, when spinning yarn using this method, thick knots or yarn breaks are easily formed at the alternation points.

[0007] (4) The double-feeding double-combing method (e.g. CN202010285094.7) utilizes the double-feeding double-combing rotor spinning technology, which can realize the independent feeding and combing of two slivers, forming two independent fiber streams that enter the same rotor from their respective fiber feeding channels. The fibers are gathered in the cohesion trough and then twisted into yarn. When the feeding mass ratio of the two component fibers is 1:1, the yarn appearance shows the characteristic of the two component fiber segments being distributed at equal intervals.

[0008] Existing double-feed double-carding rotor spinning technology has advantages such as short process flow, high production efficiency, low cost, high degree of purification of production environment, and good rotor yarn strength and evenness. However, in double-feed double-carding rotor spinning technology, the two fiber outlets corresponding to the two feed rollers are evenly distributed in the rotor, and the center line connecting the two fiber outlets passes through the rotor rotation axis, that is, the included angle between the two fiber outlets is 180°. From the appearance of the yarn, the interval length of the fiber segments of the two components is equal, which cannot achieve the purpose of precisely controlling the spacing ratio of the two fiber segments. Summary of the Invention

[0009] To address the problem in existing technologies where the ratio of the spacing between the two fiber segments cannot be precisely controlled in terms of yarn appearance, this invention provides a method for spinning bicomponent blended yarn. This method allows for precise control of the ratio of the spacing between the two fiber segments in the yarn appearance. Therefore, the yarn produced by this invention has distinctive appearance characteristics, good yarn strength, and excellent evenness.

[0010] To achieve the above objectives, the present invention adopts the following solution:

[0011] A method for spinning bicomponent blended yarn employs double-feed, double-carding rotor spinning technology. The surface of the bicomponent blended yarn exhibits a clustered and intermittent distribution of fibers from the two components, consisting of alternating arrangements of fiber segments from the first and second components. First, a ratio S is set between the length L1 of the first component fiber segment and the length L2 of the second component fiber segment in the bicomponent blended yarn, where S≠1. The first and second components are of different types or colors. The line connecting the fiber outlet a1 corresponding to the first component and the fiber outlet a2 corresponding to the second component is parallel to the plane of the rotor's cohesive groove.

[0012] Then calculate the angle λ between C1 and C2 according to the following formula, where C1 is the perpendicular line between a1 and the axis of rotation of the rotor, and C2 is the perpendicular line between a2 and the axis of rotation of the rotor.

[0013]

[0014] In the formula, the unit of λ is °;

[0015] Finally, the feeding mass ratio of the first component to the second component is controlled at 1:1, and the yarn is spun according to the calculated included angle λ to obtain the bicomponent blended yarn.

[0016] To verify whether the method of the present invention can precisely control the ratio of the spacing between the two component fiber segments on the apparent surface of the yarn, the present invention first performs a spacing ratio S The setting allows us to know the percentage M of the length of the first component fiber segment on the yarn surface relative to the total yarn length. Then, the yarn surface is visible to the naked eye to show the effect of two fiber components being distributed alternately. Next, a series of yarn photos are taken using a high-definition camera, and digital image processing tools are used to perform pre-processing on these photos to obtain binary images. Finally, an algorithm program is written to obtain the percentage M1 of the pixel value of the first fiber component along the yarn axis to the total pixel value along the yarn length direction. M and M1 are compared, and the relative error between the two is within a reasonable range, indicating that the set spacing ratio of the yarn is close to the actual spacing ratio.

[0017] This invention employs a dual-feed, dual-carding rotor spinning technology, featuring two symmetrically distributed feeding and carding devices, resulting in a centrally symmetrical airflow distribution within the rotor. Compared to traditional single-carding rotor spinning technology, the dual-feed, dual-carding rotor spinning technology exhibits smaller vortices, offering less restriction on fiber alignment and mixing, and reducing the chances of fiber entanglement and breakage. Therefore, yarns spun using this technology exhibit better yarn performance.

[0018] As a preferred technical solution:

[0019] As described above, in the spinning method of bicomponent blended yarn, during the spinning process, the fiber slivers corresponding to the first component and the second component are drawn out from the sliver can and respectively passed through two feed bell mouths. They are held by the feed rollers and feed plates and actively conveyed forward. After being combed by two independent combing rollers, they form two fiber streams. After being transported through their respective fiber conveying channels, the two fiber streams enter the coagulation tank of the rotor from two fiber exits. After being twisted by the high-speed rotation of the rotor, they are drawn out and wound into yarn. The feed mass ratio of the first component to the second component is 1:1, that is, the quantitative amount of the fiber slivers corresponding to the first component and the second component is consistent with the product of the rotation speeds of the two feed rollers. The corresponding values ​​can be set through the control panel of the spinning machine.

[0020] In the spinning method of the bicomponent blended yarn described above, the fiber length of the fiber sliver corresponding to the first component or the fiber sliver corresponding to the second component is 18–76 mm.

[0021] As described above, in the spinning method of bicomponent blended yarn, the absolute value of the difference in fiber length between the fiber sliver corresponding to the first component and the fiber sliver corresponding to the second component is 0 to 13 mm. When the difference in fiber length between the two components is too large, the fiber of the component with the longer length is prone to become entangled fiber, which will affect the appearance of the yarn.

[0022] In the spinning method of the bicomponent blended yarn described above, the average fineness of the fiber sliver corresponding to the first component or the fiber sliver corresponding to the second component is 0.5 to 5 dtex.

[0023] As described above, in the spinning method of bicomponent blended yarn, the average fineness of the fiber sliver corresponding to the first component is D1, and the average fineness of the fiber sliver corresponding to the second component is D2. E = |D1-D2| / D1×100%, and the value of E ranges from 0 to 20%. If the difference in fineness between the two fibers is too large, it will lead to a greater degree of fiber transfer between the inside and outside of the yarn after twisting, thereby affecting the apparent distribution of the two fibers in the yarn.

[0024] In the spinning method of the bicomponent blended yarn described above, the basis weight of the fiber sliver corresponding to the first component or the fiber sliver corresponding to the second component during the spinning process is 10-25 g / (5m). -1 The diameter of the rotor is 28–66 mm, and the combing speed of the two independent combing rollers is 4000–9000 r·min. -1 The rotation speed of the rotor is 40,000 to 150,000 r / min. -1 The negative pressure of the rotor is -9000 to -4000 Pa. These process parameters are set in this way to ensure smooth yarn formation, make the quality of the spun rotor yarn relatively stable, and prevent yarn breakage during spinning.

[0025] As described above, in the spinning method of bicomponent blended yarn, the two independent carding rollers are selected with the same or different models and carding speeds according to the properties of the first and second component raw materials.

[0026] The spinning method for bicomponent blended yarn described above results in a yarn count of 10–40 N. e Twist is 300-1000 t·m -1 .

[0027] In the spinning method of the bicomponent blended yarn described above, the relative error δ (=|set value - actual value| / actual value × 100%) between the set value and the actual value of S (obtained by measuring the bicomponent blended yarn) is 0~8%; the yarn evenness CV of the bicomponent blended yarn m The yarn evenness is 12%–17%, with 4–15 knots / km for fine spots (-50%), 10–18 knots / km for coarse spots (+50%), and 7–15 neps / km for 280%; the yarn evenness CV of yarns spun using the alternating method in existing technologies is... m The evenness of the yarn is 17%–22%, with 100–240 knots per kilometer for -50% of the yarn, 200–350 knots per kilometer for +50% of the yarn, and 120–185 neps per kilometer for +280% of the yarn. The comparison shows that the evenness of the bicomponent blended yarn of the present invention is superior, and the number of thick knots, thin knots, and neps is less, making it less prone to thick knots or yarn breakage.

[0028] Beneficial effects

[0029] (1) The spinning method of a bicomponent blended yarn of the present invention, compared with the existing double-feed double-combing rotor spinning technology, can achieve precise control of the ratio of the distance between the two fiber segments on the surface of the yarn by setting different relative angles of the two fiber outlets.

[0030] (2) The spinning method of the present invention for bicomponent blended yarn has advantages over existing ring spinning technology, such as high production efficiency, short process flow, good yarn strength and good yarn evenness.

[0031] (3) The spinning method of the bicomponent blended yarn of the present invention reduces the treatment and discharge of dye wastewater compared with the traditional dyeing method, and is more energy-saving and environmentally friendly. Attached Figure Description

[0032] Figure 1 This is a schematic diagram illustrating the effect of the adjustable spacing ratio of the bicomponent blended yarn of the present invention. In the diagram, L1 is the length of the first component fiber segment, and L2 is the length of the second component fiber segment.

[0033] Figure 2This is a physical image of a bicomponent blended yarn segment with adjustable spacing ratio according to the present invention. The image was taken by a high-definition camera.

[0034] Figure 3 This chart presents the results of a two-factor analysis without repetition, comparing the binary distribution of the yarn image obtained in Example 2 with the theoretically derived binary distribution. The chart was generated by performing a series of image preprocessing steps on a photograph of continuous yarn using a digital image processing tool. This process separated the yarn, background, and the blue and white adhesive portions of the yarn. The distribution pattern of the blue area along the yarn axis was then displayed using a program, outputting the percentage of blue fiber along the yarn axis (i.e., the ratio of blue pixel values ​​to the total pixel values ​​along the yarn length) pixel by pixel. The calculated average blue ratio, M1, was 31.22%. This represents a relative error of 2.26% compared to the theoretically obtained ratio (30.56%), which is within the allowable error range. This also verifies the correctness of the length ratio of the two fiber components, L1:L2 = 11:25, when the relative angle between the two fiber outlets is set to 110°.

[0035] Figure 4 This is a schematic diagram of a double-feed, double-carding rotor spinning machine used in spinning the bicomponent blended yarn with adjustable spacing ratio of the present invention.

[0036] Figure 5 The diagram represents the included angle λ, where λ is the included angle between C1 and C2, and λ≠180°. C1 is the perpendicular line between the fiber outlet a1 corresponding to the first component and the axis of rotation of the rotor, and C2 is the perpendicular line between the fiber outlet a2 corresponding to the second component and the axis of rotation of the rotor. The line connecting the fiber outlet a1 corresponding to the first component and the fiber outlet a2 corresponding to the second component is parallel to the plane where the rotor agglomeration tank is located.

[0037] Wherein, 1-fiber strip A, 2-fiber strip B, 3-feed plate A, 4-feed plate B, 5-feed roller A, 6-feed roller B, 7-carding roller A, 8-carding roller B, 9-fiber conveying channel A, 10-fiber conveying channel B, 11-rotor, 12-yarn, 13-rotor mouth plane, 14-plane where the rotor coagulation tank is located, 15-rotor rotation axis, 16-fiber outlet a1 corresponding to the first component, 17-fiber outlet a2 corresponding to the second component, 18-perpendicular line between fiber outlet a1 corresponding to the first component and the rotor rotation axis, 19-perpendicular line between fiber outlet a2 corresponding to the second component and the rotor rotation axis. Detailed Implementation

[0038] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0039] A method for spinning bicomponent blended yarn, the specific process of which is as follows:

[0040] First, such as Figure 1 As shown, the ratio S of the length L1 of the first component fiber segment and the length L2 of the second component fiber segment in the bicomponent blended yarn is defined, where S≠1; L1 and L2 are in mm, and bicomponent refers to the first and second components being of different types or colors; for example... Figure 5 As shown, the line connecting the fiber outlet a1 16 corresponding to the first component and the fiber outlet a2 17 corresponding to the second component is parallel to the plane 14 where the rotating cup condensation tank is located.

[0041] Then calculate the angle λ between C1 and C2 according to the following formula, where C1 is the perpendicular line 18 between a1 and the rotation axis 15 of the cup, and C2 is the perpendicular line 19 between a2 and the rotation axis 15 of the cup.

[0042]

[0043] In the formula, the unit of λ is °;

[0044] Finally, spinning is carried out according to the calculated included angle λ. The spinning process is as follows:

[0045] (1) Select fiber strips:

[0046] The fiber length of the fiber strips corresponding to the first component is 18-76 mm, and the average fiber fineness is D1 of 0.5-5 dtex;

[0047] The fiber length of the fiber strips corresponding to the second component is 18-76 mm, and the average fiber fineness is D2 of 0.5-5 dtex.

[0048] The absolute value of the difference in fiber length between the two components is 0–13 mm; E = |D1-D2| / D1×100%, and the value of E ranges from 0 to 20%.

[0049] (2) Spinning is carried out using a double-feed, double-combing rotor spinning machine:

[0050] like Figure 4As shown, after the fiber sliver A1 corresponding to the first component and the fiber sliver B2 corresponding to the second component are drawn out from the sliver can, fiber sliver A1 is held by the feed plate A3 and the feed roller A5 through the feed horn, and fiber sliver B2 is held by the feed plate B4 and the feed roller B6 through the feed horn. After the fiber sliver A1 and fiber sliver B2 are actively conveyed forward, they are combed by two independent combing rollers A7 and B8 to form two fiber streams. The two fiber streams are then transported through the fiber conveying channels A9 and B10 respectively, and enter the coagulation tank of the rotor 11 from the two fiber outlets. After being twisted by the high-speed rotation of the rotor, they are drawn out and wound into yarn 12, thus obtaining the two-component blended yarn.

[0051] The spinning parameters include: a feed mass ratio of the first component to the second component of 1:1; a rotor diameter of 28–66 mm; and a rotor speed of 40,000–150,000 r / min. -1 The negative pressure of the rotor is -9000 to -4000 Pa; the combing speed of the two independent combing rollers is 4000 to 9000 r·min. -1 (Maintaining consistent speed); the count of the two-component blended yarn is 10–40N. e Twist is 300-1000 t·m -1 .

[0052] The final bicomponent blended yarn exhibits a surface distribution characterized by the clustered and intermittent arrangement of fibers from both components, consisting of alternating fiber segments from the first and second components. The relative error δ between the set and actual values ​​of S is 0–8%. The evenness CV of the bicomponent blended yarn is... m The percentage is 12%–17%, with details -50% at 4–15 per kilometer, coarse knots +50% at 10–18 per kilometer, and cotton knots +280% at 7–15 per kilometer.

[0053] The sources of the relevant substances in the following embodiments are as follows:

[0054] Blue viscose fiber: Manufacturer: Zhongtai Chemical; Specification: 1.37dex×38mm blue.

[0055] White viscose fiber: Manufacturer is Bora Fiber, specification is 1.38dex×38mm white;

[0056] Red viscose fiber: Manufacturer is Bora Fiber, specification is 1.37dex×38mm red;

[0057] Coffee-colored cotton fiber: manufactured by China Colored Cotton Group, specification 1.86dex×50mm coffee color;

[0058] White cotton fiber: Manufacturer is China Colored Cotton Group, specification is 1.85dex×50mm white;

[0059] Black polyester fiber: manufactured by Hengyi Group, specification 1.5dex×38mm black;

[0060] White polyester fiber: manufactured by Hengyi Group, specification 1.5dex×38mm white.

[0061] The detection methods for relevant indicators or performance in the following embodiments are as follows:

[0062] The relative error δ between the set value and the actual value of S is calculated using the following formula:

[0063] δ = |Set value - Actual value| / Actual value × 100%;

[0064] In the formula, the actual value is obtained by measuring the two-component blended yarn;

[0065] Evenness CV of bicomponent blended yarn m Yarn defects (details, thick spots, neps) are tested according to the following industry standards:

[0066] GB / T 3292.1-2008 Textiles—Test methods for yarn unevenness of dryness—Part 1: Capacitance method; The instrument used for measurement is Changling CT3000 yarn unevenness tester;

[0067] This part of GB / T 3292 also includes methods for counting yarn defects (i.e., fine spots, thick spots and knots).

[0068] Example 1

[0069] A method for spinning bicomponent blended yarn, the specific process of which is as follows:

[0070] First, the ratio S of the length L1 of the first component fiber segment and the length L2 of the second component fiber segment in the bicomponent blended yarn is set to 0.44, where L1 and L2 are in mm. Bicomponent means that the first component and the second component are different colors. The line connecting the fiber outlet a1 corresponding to the first component and the fiber outlet a2 corresponding to the second component is parallel to the plane of the rotor condenser.

[0071] Then calculate the angle λ between C1 and C2 according to the following formula, where C1 is the perpendicular line between a1 and the axis of rotation of the rotor, and C2 is the perpendicular line between a2 and the axis of rotation of the rotor.

[0072]

[0073] The calculated value is λ = 110°.

[0074] Finally, spinning is carried out according to the calculated included angle λ. The spinning process is as follows:

[0075] (1) Select fiber strips:

[0076] The first component is blue viscose fiber, with a fiber length of 38 mm and an average fiber fineness of D1 of 1.37 dtex.

[0077] The second component is white viscose fiber, with a fiber length of 38 mm and an average fiber fineness of D2 of 1.38 dtex.

[0078] (2) Spinning is carried out using a double-feed, double-combing rotor spinning machine:

[0079] After the fiber slivers corresponding to the first and second components are drawn out of the sliver can, they are held by the feed rollers and feed plates through two feed bell mouths and actively conveyed forward. They are then combed by two independent combing rollers to form two fiber streams. After being transported through their respective fiber conveying channels, the two fiber streams enter the coagulation tank of the rotor from two fiber outlets. After being twisted by the high-speed rotation of the rotor, they are drawn out and wound into yarn to obtain the two-component blended yarn.

[0080] The spinning parameters include: the feed mass ratio of the first component to the second component is 1:1; the rotor diameter is 48 mm; and the rotor speed is 40,000 r·min. -1 The negative pressure of the rotor is -5000Pa; the two independent combing rollers are model OK40, and the combing speed is 7500 r·min. -1 The two-component blended yarn has a count of 12N. e Twist is 500 t·m -1 .

[0081] The final bicomponent blended yarn exhibits a surface distribution characterized by the clustered and intermittent arrangement of fibers from both components, consisting of alternating segments of the first and second components. The relative error δ between the set and actual values ​​of S is 3.08%. The evenness CV of the bicomponent blended yarn is... m The average number of knots was 13.47%, with details -50% averaging 6 per kilometer, coarse knots +50% averaging 12 per kilometer, and cotton knots +280% averaging 9 per kilometer.

[0082] Example 2

[0083] A method for spinning bicomponent blended yarn, the specific process of which is as follows:

[0084] First, the ratio S of the length L1 of the first component fiber segment and the length L2 of the second component fiber segment in the bicomponent blended yarn is set to 3, where L1 and L2 are in mm. Bicomponent means that the first component and the second component are different colors. The line connecting the fiber outlet a1 corresponding to the first component and the fiber outlet a2 corresponding to the second component is parallel to the plane where the rotor condenser is located.

[0085] Then calculate the angle λ between C1 and C2 according to the following formula, where C1 is the perpendicular line between a1 and the axis of rotation of the rotor, and C2 is the perpendicular line between a2 and the axis of rotation of the rotor.

[0086]

[0087] The calculated value is λ = 270°;

[0088] Finally, spinning is carried out according to the calculated included angle λ. The spinning process is as follows:

[0089] (1) Select fiber strips:

[0090] The first component is coffee-colored cotton fiber, with a fiber length of 50mm and an average fiber fineness of D1 of 1.86dtex.

[0091] The second component is white cotton fiber, with a fiber length of 50mm and an average fiber fineness of D2 of 1.85dtex.

[0092] (2) Spinning is carried out using a double-feed, double-combing rotor spinning machine:

[0093] After the fiber slivers corresponding to the first and second components are drawn out of the sliver can, they are held by the feed rollers and feed plates through two feed bell mouths and actively conveyed forward. They are then combed by two independent combing rollers to form two fiber streams. After being transported through their respective fiber conveying channels, the two fiber streams enter the coagulation tank of the rotor from two fiber outlets. After being twisted by the high-speed rotation of the rotor, they are drawn out and wound into yarn to obtain the two-component blended yarn.

[0094] The spinning parameters include: a feed mass ratio of 1:1 for the first component and 1:2 for the second component; a rotor diameter of 33 mm; and a rotor speed of 65,000 r / min. -1 The negative pressure of the rotor is -7000Pa; the two independent combing rollers are model OK40, and the combing speed of the first component feeding combing roller is 6000 r·min. -1 The combing speed of the second component feeding combing roller is 6500 r·min. -1 The two-component blended yarn has a count of 17N. e Twist is 450 t·m -1 .

[0095] The final bicomponent blended yarn exhibits a surface distribution characterized by the clustered and intermittent arrangement of fibers from both components, consisting of alternating fiber segments from the first and second components. The relative error δ between the set and actual values ​​of S is 4.12%. The evenness CV of the bicomponent blended yarn is... m The average number of knots was 12.89%, with details -50% averaging 7 per kilometer, coarse knots +50% averaging 11 per kilometer, and cotton knots +280% averaging 10 per kilometer.

[0096] Example 3

[0097] A method for spinning bicomponent blended yarn, the specific process of which is as follows:

[0098] First, the ratio S of the length L1 of the first component fiber segment and the length L2 of the second component fiber segment in the bicomponent blended yarn is set to 2, where L1 and L2 are in mm. Bicomponent means that the first component and the second component are different colors. The line connecting the fiber outlet a1 corresponding to the first component and the fiber outlet a2 corresponding to the second component is parallel to the plane where the rotor condenser is located.

[0099] Then calculate the angle λ between C1 and C2 according to the following formula, where C1 is the perpendicular line between a1 and the axis of rotation of the rotor, and C2 is the perpendicular line between a2 and the axis of rotation of the rotor.

[0100]

[0101] The calculated value is λ = 240°;

[0102] Finally, spinning is carried out according to the calculated included angle λ. The spinning process is as follows:

[0103] (1) Select fiber strips:

[0104] The first component is black polyester fiber, with a fiber length of 38mm and an average fiber fineness of D1 of 1.5dtex.

[0105] The second component is white polyester fiber, with a fiber length of 38mm and an average fiber fineness of D2 of 1.5dtex.

[0106] (2) Spinning is carried out using a double-feed, double-combing rotor spinning machine:

[0107] After the fiber slivers corresponding to the first and second components are drawn out of the sliver can, they are held by the feed rollers and feed plates through two feed bell mouths and actively conveyed forward. They are then combed by two independent combing rollers to form two fiber streams. After being transported through their respective fiber conveying channels, the two fiber streams enter the coagulation tank of the rotor from two fiber outlets. After being twisted by the high-speed rotation of the rotor, they are drawn out and wound into yarn to obtain the two-component blended yarn.

[0108] The spinning parameters include: a feed mass ratio of the first component to the second component of 1:1; a rotor diameter of 40 mm; and a rotor speed of 50,000 r / min. -1 The negative pressure of the rotor is -5500Pa; the two independent combing rollers are model OK37, and the combing speed is 7000 r·min. -1 The count of the two-component blended yarn is 23N. e Twist is 600 t·m -1 .

[0109] The final bicomponent blended yarn exhibits a clustered and intermittent fiber distribution characteristic of the two components, consisting of alternating fiber segments from the first and second components. The relative error δ between the set and actual values ​​of S is 3.37%. The evenness CV of the bicomponent blended yarn is... m The average number of knots was 13.01%, with details -50% averaging 8 per kilometer, coarse knots +50% averaging 11 per kilometer, and cotton knots +280% averaging 9 per kilometer.

[0110] Example 4

[0111] A method for spinning bicomponent blended yarn, the specific process of which is as follows:

[0112] First, the ratio S of the length L1 of the first component fiber segment and the length L2 of the second component fiber segment in the bicomponent blended yarn is set to 0.6, where L1 and L2 are in mm. Bicomponent means that the first component and the second component are different colors. The line connecting the fiber outlet a1 corresponding to the first component and the fiber outlet a2 corresponding to the second component is parallel to the plane where the rotor condenser is located.

[0113] Then calculate the angle λ between C1 and C2 according to the following formula, where C1 is the perpendicular line between a1 and the axis of rotation of the rotor, and C2 is the perpendicular line between a2 and the axis of rotation of the rotor.

[0114]

[0115] The calculated value is λ = 135°.

[0116] Finally, spinning is carried out according to the calculated included angle λ. The spinning process is as follows:

[0117] (1) Select fiber strips:

[0118] The first component is red viscose fiber, with a fiber length of 38 mm and an average fiber fineness of D1 of 1.37 dtex.

[0119] The second component is white viscose fiber, with a fiber length of 38 mm and an average fiber fineness of D2 of 1.38 dtex.

[0120] (2) Spinning is carried out using a double-feed, double-combing rotor spinning machine:

[0121] After the fiber slivers corresponding to the first and second components are drawn out of the sliver can, they are held by the feed rollers and feed plates through two feed bell mouths and actively conveyed forward. They are then combed by two independent combing rollers to form two fiber streams. After being transported through their respective fiber conveying channels, the two fiber streams enter the coagulation tank of the rotor from two fiber outlets. After being twisted by the high-speed rotation of the rotor, they are drawn out and wound into yarn to obtain the two-component blended yarn.

[0122] The spinning parameters include: the feed mass ratio of the first component to the second component is 1:1; the rotor diameter is 30 mm; and the rotor speed is 55,000 r·min. -1 The negative pressure of the rotor is -6500Pa; the two independent combing rollers are model OK40, and the combing speed of the first component feeding combing roller is 7000 r·min. -1 The combing speed of the second component feeding combing roller is 7500 r·min. -1 The count of the two-component blended yarn is 13N. e Twist is 500 t·m -1 .

[0123] The final bicomponent blended yarn exhibits a surface distribution characterized by the clustered and intermittent arrangement of fibers from both components, consisting of alternating segments of the first and second components. The relative error δ between the set and actual values ​​of S is 2.58%. The evenness CV of the bicomponent blended yarn is... m The average number of knots was 13.05%, with details -50% averaging 9 per kilometer, coarse knots +50% averaging 10 per kilometer, and cotton knots +280% averaging 7 per kilometer.

[0124] Example 5

[0125] A method for spinning bicomponent blended yarn, the specific process of which is as follows:

[0126] First, the ratio L of the length L1 of the first component fiber segment to the length L2 of the second component fiber segment in the bicomponent blended yarn is set to 1.25, where L1 and L2 are in mm. Bicomponent means that the first component and the second component are different colors. The line connecting the fiber outlet a1 corresponding to the first component and the fiber outlet a2 corresponding to the second component is parallel to the plane where the rotor condenser is located.

[0127] Then calculate the angle λ between C1 and C2 according to the following formula, where C1 is the perpendicular line between a1 and the axis of rotation of the rotor, and C2 is the perpendicular line between a2 and the axis of rotation of the rotor.

[0128]

[0129] The calculated value is λ = 200°;

[0130] Finally, spinning is carried out according to the calculated included angle λ. The spinning process is as follows:

[0131] (1) Select fiber strips:

[0132] The first component is black polyester fiber, with a fiber length of 38mm and an average fiber fineness of D1 of 1.5dtex.

[0133] The second component is white viscose fiber, with a fiber length of 38 mm and an average fiber fineness of D2 of 1.38 dtex.

[0134] (2) Spinning is carried out using a double-feed, double-combing rotor spinning machine:

[0135] After the fiber slivers corresponding to the first and second components are drawn out of the sliver can, they are held by the feed rollers and feed plates through two feed bell mouths and actively conveyed forward. They are then combed by two independent combing rollers to form two fiber streams. After being transported through their respective fiber conveying channels, the two fiber streams enter the coagulation tank of the rotor from two fiber outlets. After being twisted by the high-speed rotation of the rotor, they are drawn out and wound into yarn to obtain the two-component blended yarn.

[0136] The spinning parameters include: a feed mass ratio of 1:1 between the first and second components; a rotor diameter of 40 mm; and a rotor speed of 56,000 r / min. -1 The negative pressure of the rotor is -6000Pa; the two independent combing rollers are model OK40, the first component feed combing roller is model OK37, and the combing speed is 7000 r·min. -1 The second component is fed with OK40 combing rollers at a combing speed of 7500 r / min. -1 The two-component blended yarn has a count of 14N. e Twist is 500 t·m-1 .

[0137] The final bicomponent blended yarn exhibits a surface distribution characterized by the clustered and intermittent arrangement of fibers from both components, consisting of alternating fiber segments from the first and second components. The relative error δ between the set and actual values ​​of S is 4.71%. The evenness CV of the bicomponent blended yarn is... m The average number of knots was 14.26%, with details -50% averaging 10 per kilometer, coarse knots +50% averaging 13 per kilometer, and cotton knots +280% averaging 8 per kilometer.

Claims

1. A method for spinning a bicomponent spun yarn by using a double feeding double comb rotor spinning technique, the bicomponent spun yarn having a surface presenting a characteristic of a fiber segment of each of two components being arranged in an aggregated and spaced apart manner, the bicomponent spun yarn being composed of first component fiber segments and second component fiber segments alternately arranged, characterized in that, First, the length of the first component fiber segment in the two-component blended yarn is set to a ratio , to the length of the second component fiber segment , The first component and the second component are different in kind or color; the line connecting the fiber outlet corresponding to the first component is parallel to the plane in which the rotor condensing groove is located Then calculate according to the following formula. and The included angle , for The perpendicular line to the axis of rotation of the rotor, for The perpendicular line to the axis of rotation of the rotor; ； wherein in °; The first component and the second component are finally controlled to have a feeding mass ratio of 1:1, and the calculated angle Spinning is performed to obtain the bicomponent blended yarn.

2. The method of spinning a bicomponent spun yarn according to claim 1, characterized in that, In the spinning process, the first component corresponding fiber sliver and the second component corresponding fiber sliver are drawn out from the sliver can, respectively pass through two feeding horn, are held by the feed roller and the feed plate, and are positively forwarded, respectively pass through two independent carding rollers to form two fiber flows, after the transportation of the respective fiber conveying channel, are respectively introduced into the condensation groove of the rotor from two fiber outlets, are twisted by the high-speed rotation of the rotor, are drawn out, and are wound into yarn.

3. The method of spinning a bicomponent spun yarn according to claim 2, characterized in that The fiber length of the first component corresponding fiber sliver or the second component corresponding fiber sliver is 18-76 mm.

4. The method of spinning a bicomponent spun yarn according to claim 3, characterized in that The absolute value of the difference between the fiber length of the first component corresponding fiber sliver and the second component corresponding fiber sliver is 0-13 mm.

5. The method of spinning a bicomponent spun yarn according to claim 2, characterized in that, The average fiber fineness of the first component corresponding fiber sliver or the second component corresponding fiber sliver is 0.5-5 dtex.

6. The method of spinning a bicomponent spun yarn according to claim 5, characterized in that, The average fiber fineness of the fiber sliver corresponding to the first component is The average fiber fineness of the fiber sliver corresponding to the second component is , | - | × 100%, The value range of the second component is 0-20%.

7. The method of spinning a bicomponent spun yarn according to claim 2, characterized in that, The weight of the fiber sliver corresponding to the first component or the fiber sliver corresponding to the second component in the spinning process is 10-25 g·(5 m) -1 The diameter of the rotor is 28-66 mm, the carding speed of the two independent carding rollers is 4000-9000 r·min -1 The rotation speed of the rotor is 40000-150000 r·min -1 The negative pressure of the rotor is -9000--4000 Pa.

8. The method of spinning a bicomponent spun yarn according to any one of claims 1 to 7, characterized in that, The count of the two-component blended yarn is 10-40N e , and the twist is 300-1000 t·m -1 .

9. The method of spinning a bicomponent spun yarn according to claim 8, characterized in that, The relative error δ of the set value and the actual value of the setting value is 0~8%; the unevenness of the two-component blended yarn is 12%~17%, the fine details-50% is 4~15 per kilometer, the thick joints+50% is 10~18 per kilometer, and the neps+280% is 7~15 per kilometer. m The relative error δ of the set value and the actual value of the setting value is 0~8%; the unevenness of the two-component blended yarn is 12%~17%, the fine details-50% is 4~15 per kilometer, the thick joints+50% is 10~18 per kilometer, and the neps+280% is 7~15 per kilometer.

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