Spinning method for two-component blended yarn with adjustable interval length

Abstract

The present invention relates to a method for spinning a two-component blended yarn with adjustable interval length. The double-feed and double-combing rotor spinning technology is adopted. The surface of the two-component blended yarn shows the characteristic of agglomerated interval distribution of fibers of two different components, which is composed of alternating arrangements of fiber segments of two different components. The method includes the steps: (1) setting the yarn drawing speed v, the rotor diameter d, and the interval length L of the fiber segments of two different components; (2) calculating the rotor rotation speed n; (3) judging whether n≤35000 holds. If so, proceed to step (4); otherwise, return to step (1); (4) selecting two different components, controlling the feeding mass ratio of the two different components to be 1:1, controlling the included angle λ between C1 and C2 to be 180°, and spinning according to the set v, the set d, and the calculated n to obtain the two-component blended yarn. The method of the present invention is simple and effectively realizes the adjustable interval length of the two-component blended yarn.

Description

Technical Field

[0001] The present invention belongs to the technical field of spinning, and particularly relates to a method for spinning a two-component blended yarn with adjustable interval length. Background Art

[0002] A blended yarn refers to a yarn spun by mixing two or more different types or colors of fibers in a certain proportion. Compared with a yarn made of a single raw material, a blended yarn can combine the advantages of different types of fibers to improve the performance of the yarn; at the same time, using fibers of different colors as raw materials, through different spinning techniques or technological means, a yarn with an apparent two-component interval distribution with rich colors, strong layering, and high designability can be spun; the fabric made therefrom is widely used in high-grade shirts, women's dresses and suits, which can meet people's personalized pursuits and has great economic added value.

[0003] There are mainly three methods for spinning a yarn with an apparent two-component interval distribution in the prior art:

[0004] (1) The printing and dyeing method, that is, using a dye solution to dye the hank yarn section. The yarn obtained therefrom belongs to a kind of section-colored yarn. However, due to the limitations of actual production, the length of each color section is relatively long, and the interval length between the two color sections cannot be accurately adjusted. There is also a problem of poor color fastness of the yarn; at the same time, there will be a problem of discharging printing and dyeing wastewater in the subsequent process, which causes environmental pollution to a certain extent;

[0005] (2) The ring spinning method, including three methods: loose fiber mixing, sliver mixing, and roving mixing; loose fiber mixing is to sequentially feed two or more kinds of fibers on a cotton mixing machine so that different fibers are distributed in segments at various parts of the sliver; sliver mixing means that in the drawing process, slivers of different types / colors are combined according to the designed blending ratio to achieve the effect of interval distribution of different components; whether it is loose fiber mixing or sliver mixing, the process flow becomes longer; roving mixing is on a modified ring spinning frame, and two different-component rovings are fed alternately through two pairs of rollers; however, the position where the co-component roving stops feeding is unstable, and it is difficult to ensure the precise overlap of the re-fed roving, which is easy to break or produce thick places; using a ring spinning machine to spin yarn, the ring spinning technology has disadvantages such as low spinning speed, small package capacity, low automation degree, and long process flow;

[0006] (3) Rotor spinning method, which has the advantages of short process flow, high production efficiency, low cost, high degree of purification of the production environment, and relatively good strength and evenness of rotor yarn; for example, Patent CN111501161A discloses a method for producing fancy yarns using double-feed double-combing rotor spinning technology. This technology can achieve independent feeding and combing of two rovings compared with the traditional single-feed single-combing rotor spinning technology, forming two independent fiber streams entering the same rotor from their respective corresponding fiber conveying channels. After the fibers are agglomerated in the condensing groove, they are twisted into yarn. When the feeding mass ratio of the two component fibers is 1:1, the yarn generally shows the characteristic of alternating distribution of two component fiber segments on the surface; however, this technology has two deficiencies:

[0007] ① The set range of the rotor rotation speed used in this technology is 40,000 - 150,000 r·min -1 , the rotor rotation speed is relatively fast, resulting in a large centrifugal force on the fibers when they enter the rotor condensing groove, so the frictional resistance on the fibers becomes larger, affecting the arrangement and distribution of the two fibers in the condensed sliver; if the rotor rotation speed is too high, it will cause unevenness in the interval length of the two fiber segments on the surface of the yarn.

[0008] ② For the blended yarn produced by this technology, the interval length of the two fiber segments cannot be precisely regulated, and there is no specific process parameter setting guide to achieve precise control of the interval length, and the interval length of the spun yarn is random.

[0009] In summary, it is of great significance to develop a method that can more accurately and effectively achieve precise regulation of the interval length of two fiber segments. Summary of the Invention

[0010] To solve the problem that the interval length of two component fiber segments cannot be precisely regulated on the surface of the yarn in the prior art, the present invention provides a method for spinning a two-component blended yarn with adjustable interval length. Through this method, by setting the rotor rotation speed accordingly, precise regulation of the interval length of two component fiber segments on the surface of the yarn can be achieved.

[0011] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0012] A method for spinning a two-component blended yarn with adjustable interval length, using double-feed double-combing rotor spinning technology. The surface of the two-component blended yarn shows the characteristics of agglomerated interval distribution of two different component fibers, and is composed of alternating arrangement of two different component fiber segments, including the following steps:

[0013] (1) Set the yarn drawing speed v, rotor diameter d, and the interval length L of two different component fiber segments.

[0014] (2) Calculate the rotational speed n of the rotor cup. The formula is as follows:

[0015]

[0016] In the formula, the unit of L is mm; the unit of v is m·min -1 ; the unit of n is r·min -1 ; the unit of d is mm;

[0017] (3) Determine whether n ≤ 35000 holds. If it does, proceed to step (4); otherwise, return to step (1); when the rotational speed of the rotor cup is too high, the centrifugal force and frictional force received by the fibers after entering the rotor cup will be greater, which will affect the arrangement and distribution of the fibers in the condensation groove, thereby affecting the distribution of the fibers on the surface of the yarn body and the yarn, resulting in a large unevenness in the interval length between the two fiber segments. The evenness of the interval length between the two fiber segments is an important prerequisite for the present invention to achieve adjustable interval length. Therefore, the present invention controls n ≤ 35000;

[0018] (4) Select two different components, control the feeding mass ratio of the two different components to be 1:1, and control the 1 angle λ between C 2 and C 1 to be 180°. C 1 is the perpendicular line from the fiber outlet a 2 corresponding to the first component to the axis of rotation of the rotor cup, and C 2 is the perpendicular line from the fiber outlet a

[0019] corresponding to the second component to the axis of rotation of the rotor cup. Spin the yarn according to the set yarn guiding speed v, the set rotor cup diameter d, and the calculated rotational speed n of the rotor cup to obtain a two-component blended yarn.

[0020] The technical problem first solved by the present invention is the uneven interval length of the two fiber segments on the surface of the two-component blended yarn in the prior art;

[0021] Secondly, during the spinning process, the fibers in the rotor spinner are mainly affected by the fiber feeding channel and the airflow field inside the rotor; when the 1 angle between C 2 and C Figure 3 is λ = 180°, as shown in, with respect to the plane where the rotor axis of rotation and the rotor are located, the fiber outlet corresponding to the two components is symmetrically distributed. Therefore, the overall characteristic of the airflow field inside the spinner is centrosymmetrically distributed; when the fiber flows of the two components enter the condensing groove simultaneously, with the rotation of the rotor and the drawing of the yarn, the two fiber segments on the surface of the yarn show the characteristic of equidistant interval distribution; when λ ≠ 180°, this symmetry will disappear;

[0022] Finally, the numerical limit of the rotor rotation speed within 35000 is because when the rotor rotation speed exceeds 35000 r·min -1 , the two-component fiber segments on the surface of the yarn cannot always maintain an equidistant interval; because the greater the rotor rotation speed, the greater the centrifugal force and frictional force exerted on the fibers after they enter the rotor, which will affect the arrangement and distribution of the fibers in the condensing groove, thereby affecting the distribution of the fibers in the yarn body and on the surface of the yarn, resulting in a large unevenness in the interval length between the two fiber segments. And the uniformity of the interval length between the two fiber segments is an important prerequisite for the present invention to achieve adjustable interval length. Therefore, the present invention controls n ≤ 35000.

[0023] On the premise of solving the above problems, the present invention solves the problem that the interval length of the existing two-component blended yarn cannot be adjusted. The present invention first establishes a relationship among the interval length, yarn drawing speed, rotor rotation speed, and rotor diameter, and proposes a specific calculation formula. Using this formula, the yarn drawing speed, rotor rotation speed, and rotor diameter required for producing a two-component blended yarn with a target interval length can be calculated, and finally the interval length of the two-component blended yarn can be adjusted.

[0024] As a preferred technical solution:

[0025] For the spinning method of a two-component blended yarn with an adjustable interval length as described above, n ≥ 10000; when the rotor rotation speed is lower than 10000 r·min -1 , on the one hand, too low a rotor rotation speed will result in too small a centrifugal force generated during the rotation of the rotor, thereby causing the fibers to not agglomerate well in the rotor condensing groove; on the other hand, too low a rotor rotation speed will affect the spinning speed and lead to a reduction in production efficiency. Therefore, the present invention controls n ≥ 10000.

[0026] A method for spinning a two-component blended yarn with adjustable spacer length. During the spinning process, after the fiber slivers corresponding to the two different components are drawn out from the sliver cans, they respectively pass through two feeding funnels, are held by the feeding rollers and the feeding plates, and are actively transported forward. Then, they are respectively combed by two independent carding rollers to form two fiber streams. After being transported through their respective fiber conveying channels, the two fiber streams respectively enter the condensing groove of the rotor from two fiber outlets, are twisted by the high-speed rotation of the rotor, and then drawn out and wound into yarn.

[0027] A method for spinning a two-component blended yarn with adjustable spacer length. The fiber average length of the fiber slivers corresponding to the two different components ranges from 18 to 76 mm, and the difference does not exceed 13 mm. When the fiber length is less than 18 mm, the entanglement force between fibers will become smaller, resulting in a decrease in the breaking strength of the yarn. When the fiber length is greater than 76 mm, due to the excessive length, it is not easy to be fully twisted into the yarn body during the twisting process, and the part remaining outside the yarn is likely to become the hairiness of the yarn. When the fiber length difference between the two components is too large (greater than 13 mm), the fibers of the component with a longer length are likely to form wrapped fibers on the surface of the yarn, which will affect the length of L on the surface of the yarn and cause unevenness of the two components on the yarn.

[0028] A method for spinning a two-component blended yarn with adjustable spacer length. The fiber average fineness of the fiber slivers corresponding to the two different components ranges from 1.35 to 1.8 dtex, E = |D 1 -D 2 | / D 1 ×100%, and the value range of E is 0 to 20%. D 1 and D 2 are respectively the fiber average fineness of the fiber slivers corresponding to the two different components. If the fineness difference between the two fibers is too large, it will lead to a deeper degree of fiber internal and external transfer after the yarn is twisted, thus affecting the apparent distribution of the two fibers in the formed yarn. Therefore, the present invention controls E not to exceed 20%.

[0029] A method for spinning a two-component blended yarn with adjustable spacer length. The process parameters during the spinning process are as follows: the fixed weight of each fiber sliver is 10 to 25 g·(5 m) -1 , the rotor diameter is 32 to 54 mm, the carding speeds of the left and right carding rollers are 4000 to 9000 r·min -1 , and the rotor negative pressure is -9000 to -4000 Pa. The purpose of setting these process parameters is to ensure smooth yarn formation, make the quality of the spun rotor yarn relatively stable, and prevent yarn breakage during spinning.

[0030] A spinning method for a two-component blended yarn with adjustable interval length as described above, the linear density of the two-component blended yarn is 14.5 to 59 tex, and the twist is 300 to 1000 t·m -1 , the P value is greater than 0.05.

[0031] Beneficial effects:

[0032] (1) Based on the traditional double-feed double-combing rotor spinning technology, the spinning method for a two-component blended yarn with adjustable interval length of the present invention derives the relationship between the interval length of the two fiber segments and the yarn drawing speed, the rotor diameter, and the rotor rotation speed, and can achieve the effect that the surface of the two-component blended yarn presents an equidistant interval distribution of the two fiber segments;

[0033] (2) The spinning method for a two-component blended yarn with adjustable interval length of the present invention can achieve precise control of the interval length of the two-component fiber segments on the surface of the yarn body by setting different rotor rotation speeds;

[0034] (3) The spinning method for a two-component blended yarn with adjustable interval length of the present invention has the advantages of high production efficiency, short process flow, good yarn strength performance, etc. At the same time, it reduces the treatment and discharge links of dye wastewater, and is more energy-saving and environmentally friendly;

[0035] (4) The yarn produced by the spinning method for a two-component blended yarn with adjustable interval length of the present invention has distinct appearance characteristics and enriches the variety of new yarns. Description of the drawings

[0036] Figure 1 It is a physical picture taken by a high-definition camera of the two-component blended yarn segment obtained in Example 1 of the present invention;

[0037] Figure 2 It is a comparison diagram of the actual and theoretical binary distribution curves with the interval length L as the search window of the two-component blended yarn obtained in Example 1 of the present invention; in the figure, (a) is the binary distribution curve in the actual situation, and (b) is the binary distribution curve in the theoretical situation;

[0038] Figure 3 It is a schematic diagram of the relative position distribution between the two fiber feeding channels of the double-feed double-combing rotor spinning device and the rotor in the present invention;

[0039] Among them, 1-rotor mouth plane, 2-plane where the rotor condensation groove is located, 3-rotor rotation axis, 4-fiber outlet a corresponding to the first component 1 , 5-fiber outlet a corresponding to the second component 2 , 6-fiber outlet a corresponding to the first component 1 Perpendicular line to the rotor rotation axis, 7-fiber outlet a corresponding to the second component 2The perpendicular line to the axis of rotation of the rotor. Detailed implementation manners

[0040] The present invention will be further described below in conjunction with specific implementation manners. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0041] The detection method of the P value of the two-component blended yarn prepared in the embodiment is as follows:

[0042] In order to verify whether the interval length between the two color segments of the actually spun yarn is consistent with the set value, the present invention performs a series of image pre-processings on the photographed continuous yarn photos by using digital image processing tools; then the image is binarized, and the pixel value of each pixel point of the fiber with a darker color on the image is 0, and the pixel value of each pixel point of the fiber with a lighter color is 1; a search window is set on the binarized picture, and the length of the search window is set equal to the equidistant interval length L, the number of pixel points in the search window is a, and the pixel sum b of each search window is calculated. If b≥a / 2, then this search window is assigned a value of 1, otherwise it is assigned a value of 0, and the binary distribution curve of the actual and theoretical yarns can be obtained. For example, the binary distribution curve of the two-component blended yarn prepared in Example 1 is as Figure 2 shown, where Figure 2 (a) shows the binary distribution curve obtained after the yarn is processed by image processing, which is the binary distribution in the actual situation; in the theoretical situation, the fiber segments of the two colors are evenly spaced, and after the image of the yarn is binarized, the pixel value of each pixel point of the fiber segment with a darker color is 0, and the pixel value of each pixel point of the fiber segment with a lighter color is 1. Therefore, according to the same assignment principle, the assignment order of the search window in the theoretical situation is "0, 1, 0, 1, 0, 1, 0, 1...", and the 0 value and 1 value are spaced apart, and the distribution curve is as Figure 2 (b) shown; comparing the binary distributions of the yarns in the actual and theoretical situations, through two-way ANOVA without replication, and then judging whether there is a significant difference between the two; the P value obtained from the ANOVA is an index to measure whether there is a significant difference between the two groups of data; if the P value is greater than 0.05, it means that there is no significant difference between the two groups of data, and it can be considered that the interval length between the two color segments of the actually spun yarn is consistent with the set value.

[0043] A method for spinning a two-component blended yarn with adjustable interval length, adopting the double-feed and double-combing rotor spinning technology. The surface of the two-component blended yarn shows the characteristics of aggregated and spaced distribution of fibers of two different components, and is composed of alternating arrangements of fiber segments of two different components. The specific steps are as follows:

[0044] (1) Set the yarn feeding speed v, the rotor diameter d (32 - 54 mm), and the interval length L between two fiber segments of different components;

[0045] (2) Calculate the rotor rotational speed n, with the formula as follows:

[0046]

[0047] In the formula, the unit of L is mm; the unit of v is m·min -1 ; the unit of n is r·min -1 ; the unit of d is mm;

[0048] (3) Determine whether 10000 ≤ n ≤ 35000 holds. If it does, proceed to step (4); otherwise, return to step (1);

[0049] (4) Select two fiber slivers of different components; the average length of the fiber sliver of the first component is 18 - 76 mm, the average fineness of the fibers in the fiber sliver is 1.35 - 1.8 dtex, the average length of the fiber sliver of the second component is 18 - 76 mm, and the average fineness of the fibers in the fiber sliver is 1.35 - 1.8 dtex; the difference in the average lengths of the two fiber slivers of different components ≤ 13 mm; E = |D 1 - D 2 | / D 1 ×100%, the value range of E is 0 - 20%, D 1 and D 2 are respectively the average fineness of the fibers in the fiber slivers corresponding to the two different components; the weight per unit length of each fiber sliver is 10 - 25 g·(5 m) -1 ;

[0050] (5) Control the feeding mass ratio of the two fiber slivers of different components to be 1:1, control the angle λ between C 1 and C 2 to be 180°, C 1 is the perpendicular line from the fiber outlet a corresponding to the first component 1 to the axis of rotation of the rotor, C 2 is the perpendicular line from the fiber outlet a corresponding to the second component 2 to the axis of rotation of the rotor, and spin yarn according to the set yarn feeding speed v, the set rotor diameter d, and the calculated rotor rotational speed n; among them, the carding speeds of the left and right carding rollers are 4000 - 9000 r·min -1 , and the rotor negative pressure is -9000 - -4000 Pa;

[0051] During the spinning process, after the fiber slivers corresponding to the two different components are drawn out from the sliver cans, they respectively pass through two feeding funnels, are held by the feeding rollers and the feeding plate, and are actively transported forward. Then, they are respectively combed by two independent carding rollers to form two fiber streams. After being transported through their respective fiber conveying channels, the two fiber streams respectively enter the condensing groove of the rotor from two fiber outlets, are twisted by the high-speed rotation of the rotor, and then are drawn out and wound into yarn;

[0052] The linear density of the finally produced two-component blended yarn is 14.5 - 59 tex, and the twist is 300 - 1000 t·m -1 , and the P value is greater than 0.05. The present invention will be further described below in conjunction with specific embodiments:

[0053] Example 1

[0054] A spinning method for a two-component blended yarn with adjustable interval length, the specific steps are as follows:

[0055] (1) Set the yarn drawing speed v = 60 m·min -1 , the rotor diameter d = 48 mm, and the interval length L between the fiber segments of the two different components = 1 mm;

[0056] (2) Calculate the required rotor rotational speed n = 29602.11 r·min according to the formula -1 ;

[0057] (3) Selection of raw materials:

[0058] The fiber type of the fiber sliver corresponding to the first component is blue viscose, the average fiber length is 40 mm, and the average fiber fineness is 1.37 dtex;

[0059] The fiber type of the fiber sliver corresponding to the second component is white viscose, the average fiber length is 40 mm, and the average fiber fineness is 1.38 dtex;

[0060] (4) Other spinning process parameters:

[0061] The feeding mass ratio of the fibers of the two components is set to 1:1, and the fixed quantity of each fiber sliver is 21.3 g·(5 m) -1 ; The rotational speeds of the left and right carding rollers are set to 7500 r·min -1 ; The models of the left and right carding rollers are OK40; The rotor negative pressure is set to -5000 Pa;

[0062] The linear density of the finally produced two-component blended yarn is 50 tex, and the twist is 493.37 t·m -1 , and the P value is 0.4588.

[0063] The physical diagram of the rotor yarn spun in this example taken by a high-definition camera is as follows Figure 1 shown. The color distribution on the surface of the yarn basically presents the characteristic of intermittent distribution of fiber segments of two colors, blue and white, in the overall visual sense.

[0064] Comparative Example 1

[0065] A method for spinning a two-component blended yarn is basically the same as that in Example 1, except that: the rotor rotational speed n = 29000 r·min -1 .

[0066] The linear density of the finally obtained two-component blended yarn is 50 tex, the twist is 483.33 t·m -1 , and the P value is 0.0438.

[0067] Comparing Example 1 with Comparative Example 1, it can be seen that when the relationship between the intermittent length of the two fiber segments and the yarn drawing speed, the rotor diameter, and the rotor rotational speed does not satisfy the formula of the present invention, the adjustable control of the intermittent length cannot be achieved.

[0068] Example 2

[0069] A method for spinning a two-component blended yarn with adjustable intermittent length, the specific steps are as follows:

[0070] (1) Set the yarn drawing speed v = 65 m·min -1 , the rotor diameter d = 32 mm, and the intermittent length L of the fiber segments of two different components = 1.5 mm;

[0071] (2) Calculate the required rotor rotational speed n = 21020.10 r·min according to the formula -1 ;

[0072] (3) Selection of raw materials:

[0073] The fiber type of the fiber sliver corresponding to the first component is white cotton fiber, the average fiber length is 29 mm, and the average fiber fineness is 1.8 dtex;

[0074] The fiber type of the fiber sliver corresponding to the second component is black viscose, the average fiber length is 38 mm, and the average fiber fineness is 1.67 dtex;

[0075] (4) Other spinning process parameters:

[0076] The feeding mass ratio of the fibers of the two components is set to 1:1, and the quantitative value of each fiber sliver is 20.1 g·(5 m) -1 ; the rotational speeds of the left and right carding rollers are set to 8000 r·min -1; The models of the left and right carding rollers are OK37; the rotor negative pressure is set to -6000 Pa;

[0077] The finally obtained two-component blended yarn apparently shows the characteristic of obvious interval distribution of black and white fiber segments; the linear density of the yarn is 34 tex; the twist is 323.39 t·m -1 , and the P value is 0.6219.

[0078] Comparative Example 2

[0079] A method for spinning a two-component blended yarn is basically the same as that in Example 2, except that: the rotor rotational speed n = 21000 r·min -1 .

[0080] The linear density of the finally obtained two-component blended yarn is 34 tex; the twist is 323.08 t·m -1 , and the P value is 0.0385.

[0081] Comparing Example 1 with Comparative Example 1, it can be seen that when the relationship between the interval length of the two fiber segments and the yarn drawing speed, the rotor diameter, and the rotor rotational speed does not satisfy the formula of the present invention, the adjustable interval length cannot be achieved.

[0082] Example 3

[0083] A method for spinning a two-component blended yarn with an adjustable interval length comprises the following specific steps:

[0084] (1) Set the yarn drawing speed v = 65 m·min -1 , the rotor diameter d = 32 mm, and the interval length L of the two different component fiber segments = 1.5 mm;

[0085] (2) Calculate the required rotor rotational speed n = 21020.1 r·min according to the formula -1 ;

[0086] (3) Selection of raw materials:

[0087] The fiber type of the fiber sliver corresponding to the first component is white cotton fiber, the average fiber length is 29 mm, and the average fiber fineness is 1.8 dtex;

[0088] The fiber type of the fiber sliver corresponding to the second component is black viscose, the average fiber length is 38 mm, and the average fiber fineness is 1.67 dtex;

[0089] (4) Other spinning process parameters:

[0090] The feeding mass ratio of the two-component fibers is set to 1:1, and the fixed quantity of each fiber sliver is 20.1 g·(5 m) -1; The rotational speeds of the left and right carding rollers are set to 8000 r·min -1 ; The models of the left and right carding rollers are OK37; the rotor negative pressure is set to -6000 Pa;

[0091] The finally obtained two-component blended yarn apparently shows the characteristic of obvious alternating distribution of black and white fiber segments; the linear density of the yarn is 34 tex and the twist is 323.39 t·m -1 , and the P value is 0.6219.

[0092] Example 4

[0093] A method for spinning a two-component blended yarn with adjustable interval length, the specific steps are as follows:

[0094] (1) Set the yarn guiding speed v = 60 m·min -1 , the rotor diameter d = 54 mm, and the interval length L of the fiber segments of two different components = 1 mm;

[0095] (2) Calculate the required rotor rotational speed n = 29646.32 r·min according to the formula -1 ;

[0096] (3) Selection of raw materials:

[0097] The fiber type of the fiber sliver corresponding to the first component is red viscose, the average fiber length is 38 mm, and the average fiber fineness is 1.38 dtex;

[0098] The fiber type of the fiber sliver corresponding to the second component is black viscose, the average fiber length is 38 mm, and the average fiber fineness is 1.67 dtex;

[0099] (4) Other spinning process parameters:

[0100] The feeding mass ratio of the fibers of the two components is set to 1:1, and the fixed quantity of each fiber sliver is 18.7 g·(5 m) -1 ; The rotational speeds of the left and right carding rollers are set to 7500 r·min -1 ; The models of the left and right carding rollers are OK40; the rotor negative pressure is set to -7000 Pa;

[0101] The finally obtained two-component blended yarn apparently shows the characteristic of obvious alternating distribution of black and white fiber segments; the linear density of the yarn is 45 tex and the twist is 494.11 t·m -1 , and the P value is 1.0384.

[0102] Example 5

[0103] A method for spinning a two-component blended yarn with adjustable interval length, the specific steps are as follows:

[0104] (1) Set the yarn drawing speed v = 55 m·min -1 , the rotor diameter d = 54 mm, and the interval length L of two fiber segments with different components = 0.8 mm;

[0105] (2) Calculate the required rotor rotational speed n = 34050.8 r·min according to the formula -1 ;

[0106] (3) Selection of raw materials:

[0107] The fiber type of the fiber sliver corresponding to the first component is black polyester, the average fiber length is 48 mm, and the average fiber fineness is 1.5 dtex;

[0108] The fiber type of the fiber sliver corresponding to the second component is white cotton fiber, the average fiber length is 29 mm, and the average fiber fineness is 1.8 dtex;

[0109] (4) Other spinning process parameters:

[0110] The feeding mass ratio of the fibers of the two components is set to 1:1, and the fixed quantity of each fiber sliver is 23.2 g·(5 m) -1 ; The rotational speeds of the left and right carding rollers are set to 7800 r·min -1 ; The models of the left and right carding rollers are 0K37; the rotor negative pressure is set to -6500 Pa;

[0111] The finally produced two-component blended yarn apparently shows the characteristics of obvious interval distribution of black and white fiber segments; the linear density of the yarn is 40 tex, and the twist is 619.11 t·m -1 , and the P value is 0.4462.

[0112] Example 6

[0113] A method for spinning a two-component blended yarn with adjustable interval length, and the specific steps are as follows:

[0114] (1) Set the yarn drawing speed v = 80 m·min -1 , the rotor diameter d = 48 mm, and the interval length L of two fiber segments with different components = 1.5 mm;

[0115] (2) Calculate the required rotor rotational speed n = 26136.15 r·min according to the formula -1 ;

[0116] (3) Selection of raw materials:

[0117] The fiber type of the sliver corresponding to the first component is white polyester, with an average fiber length of 38 mm and an average fiber fineness of 1.52 dtex;

[0118] The fiber type of the sliver corresponding to the second component is blue polyester, with an average fiber length of 48 mm and an average fiber fineness of 1.49 dtex;

[0119] (4) Other spinning process parameters:

[0120] The feeding mass ratio of the fibers of the two components is set to 1:1, and the fixed quantity of each sliver is 15.5 g·(5 m) -1 ; The rotational speeds of the left and right carding rollers are set to 7500 r·min -1 ; The models of the left and right carding rollers are OK40; The rotor negative pressure is set to -5500 Pa;

[0121] The finally obtained two-component blended yarn apparently shows the characteristic of an obvious alternating distribution of black and white fiber segments; The linear density of the yarn is 25 tex and the twist is 326.7 t·m -1 , and the P value is 0.3994.

[0122] Example 7

[0123] A method for spinning a two-component blended yarn with adjustable interval length, the specific steps are as follows:

[0124] (1) Set the yarn guiding speed v = 45 m·min -1 , the rotor diameter d = 40 mm, and the interval length L of the fiber segments of the two different components = 0.75 mm;

[0125] (2) Calculate the required rotor rotational speed n = 29641.9 r·min according to the formula -1 ;

[0126] (3) Selection of raw materials:

[0127] The fiber type of the sliver corresponding to the first component is white viscose, with an average fiber length of 38 mm and an average fiber fineness of 1.37 dtex;

[0128] The fiber type of the sliver corresponding to the second component is black polyester, with an average fiber length of 48 mm and an average fiber fineness of 1.5 dtex;

[0129] (4) Other spinning process parameters:

[0130] The feeding mass ratio of the fibers of the two components is set to 1:1, and the fixed quantity of each sliver is 18.3 g·(5 m) -1 ; The rotational speeds of the left and right carding rollers are set to 6800 r·min-1 ; The models of the left and right carding rollers are OK40; the rotor negative pressure is set at -8000 Pa;

[0131] The finally obtained two-component blended yarn apparently shows the characteristic of obvious interval distribution of black and white fiber segments; the linear density of the yarn is 50 tex and the twist is 658.71 t·m -1 , and the P value is 1.3227.

Claims

1. A method for spinning a two-component blended yarn with adjustable interval length, which adopts the double-feed and double-combing rotor spinning technology. The surface of the two-component blended yarn shows the characteristic of the aggregated interval distribution of fibers of two different components, and is composed of the alternating arrangement of fiber segments of two different components. It is characterized in that the method includes the following steps: (1) Set the yarn drawing speed v, the rotor diameter d, and the interval length L of the fiber segments of two different components. (2) Calculate the rotor rotation speed n, and the formula is as follows: where the unit of L is mm; the unit of v is m·min -1 ; the unit of n is r·min -1 ; the unit of d is mm; (3) Judge whether n ≤ 35000 holds. If it is, then go to step (4); otherwise, return to step (1). (4) Select two different components, control the feeding mass ratio of the two different components to be 1:1, and control C 1 and C 2 to have an included angle λ of 180°. C 1 is the fiber outlet a corresponding to the first component 1 and the perpendicular line to the rotary axis of the rotor. C 2 is the fiber outlet a corresponding to the second component 2 and the perpendicular line to the rotary axis of the rotor. Spin yarn according to the set yarn drawing speed v, the set rotor diameter d, and the calculated rotor rotary speed n to obtain a two-component blended yarn.

2. The method for spinning a two-component blended yarn with adjustable interval length according to claim 1, it is characterized in that n≥10000。 3. The method for spinning a two-component blended yarn with adjustable interval length according to claim 1, it is characterized in that During the spinning process, after the fiber sliver corresponding to the two different components is drawn out from the sliver can, it passes through two feeding funnels respectively, is held by the feeding roller and the feeding plate, and is actively transported forward. Then, it passes through two independent combing rollers respectively for carding to form two fiber streams. After being transported through their respective fiber conveying channels, the two fiber streams enter the condensing groove of the rotor from two fiber outlets respectively, and are drawn out after being twisted by the high-speed rotation of the rotor and wound into yarn.

4. The method for spinning a two-component blended yarn with adjustable interval length according to claim 3, it is characterized in that the value range of the average fiber length of the fiber sliver corresponding to the two different components is 18 - 76 mm, and the difference does not exceed 13 mm.

5. The method for spinning a two-component blended yarn with adjustable interval length according to claim 3, it is characterized in that The value range of the average fiber fineness of the sliver corresponding to the two different components is 1.35 to 1.8 dtex, E = |D 1 - D 2 | / D 1 × 100%, the value range of E is 0 to 20%, D 1 and D 2 are the average fiber fineness of the sliver corresponding to the two different components respectively.

6. The method for spinning a two-component blended yarn with adjustable interval length according to claim 1, it is characterized in that The process parameters in the spinning process are as follows: the fixed quantity of each fiber sliver is 10 - 25 g·(5 m). -1 , the rotor diameter is 32 - 54 mm, and the carding speeds of the left and right carding rollers are 4000 - 9000 r·min -1 , and the rotor negative pressure is -9000 - -4000 Pa.

7. The method for spinning a two-component blended yarn with adjustable interval length according to claim 1, it is characterized in that The linear density of the two-component blended yarn is 14.5 to 59 tex, and the twist is 300 to 1000 t·m -1 , and the P value is greater than 0.05.

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