A spinning method for changing the structure of a yarn

Abstract

The application relates to a spinning method for changing the structure of yarn, wherein a first circular belt and a second circular belt are arranged in sequence between the front roller and the guide hook of a spinning frame; the yarn sliver formed after the roving is drafted is first inclined downward by an angle Phi to pass through the first circular belt below to form spinning section I, and then passes through the second circular belt above to form spinning section II, and is wound after the guide hook to obtain the yarn; the first circular belt and the second circular belt move transversely and respectively apply tangential friction to the yarn sliver; the designed twist factor of the yarn is 190-270, and the actual measured twist factor is 191-295. The spinning method for changing the structure of yarn is characterized in that the yarn sliver is twisted and untwisted twice under the action of the two circular belts, the twisting action increases the dynamic twist of the yarn near the front roller nip, provides sufficient yarn forming tension for the formed yarn, thereby the ultra-low twist yarn can be prepared, the yarn breakage is less, the yarn body prepared by the application is fluffy, the hand feeling is soft, and the fabric grain is clear.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of textile processing, and relates to a spinning method for changing the structure of yarn. BACKGROUND

[0002] With the development of the textile market and the innovation of textile fabrics, consumers are more pursuing the cost-effective of clothing fabrics, showing a shift from focusing on quantity satisfaction to pursuing quality improvement. Soft textiles can bring people physical and mental comfort, effectively relieving the fatigue, stress and anxiety of contemporary high-pressure working groups.

[0003] The current methods for soft finishing of textiles are: (1) chemical finishing, using chemical reagents to change the crystalline region of fibers to make the fibers soft, or coating surfactants on the surface of the fabric, which plays a lubricating role when the fabric rubs against the human body. Chemical finishing can achieve good softness, but it pollutes the environment; (2) physical finishing, using physical and mechanical means to finish the fabric by patting, rotating, rubbing, etc. to make the fabric fluffy. This method is a passive soft finishing method. Although there is no chemical agent in the finishing process, it is a green and environmentally friendly finishing method, but the damage and destruction to the fabric during the finishing process are irreversible.

[0004] The traditional ring spinning yarn structure presents the characteristics of "tight inside and loose outside", the yarn feels hard, and the fabric is soft. The method of changing the yarn structure to change the softness of the fabric can avoid the pollution problem brought by chemical finishing, reduce the additional post-process of physical finishing, reduce production costs, and achieve true green environmental protection.

[0005] Patent CN103361786 discloses a method and apparatus for applying false twist to yarn before ring spinning. Downstream of the front roller, the twisted yarn is drawn across first and second running sections of a traveling annular belt, such that the yarn wraps around a first convex surface of the first running section and then passes between the first and second running sections before wrapping around a second convex surface of the second running section. The friction between each of the first and second convex surfaces and the yarn applies false twist in a common direction, and each of the first and second annular belts is required to have a corresponding linear running section, which is substantially parallel to each other, such that the linear running sections can be aligned parallel to the front draft roller. Compared to traditional ring spinning, its parallel ring belt false twisting method can form yarns with lower residual torque, resulting in knitted fabrics with a soft hand feel. However, when this technology is applied to woven fabrics, the softness is not obvious. The fundamental reason is that this technology does not change the "tight inside and loose outside" characteristic of the yarn. Moreover, this technology is suitable for producing low-twist yarns with a twist coefficient of 280 to 320. When producing ultra-low-twist yarns with a twist coefficient below 280 to prepare softer fabrics, insufficient spinning tension will cause yarn breakage, reduce yarn quality, and make it impossible to guarantee normal use in subsequent processes. At the same time, because ultra-low-twist yarns have a low twist coefficient, their fabric texture is not clear.

[0006] To solve the above problems, it is necessary to develop a spinning method that alters the yarn structure to give the product a soft and fluffy texture. Summary of the Invention

[0007] The purpose of this invention is to solve the problems in the prior art where the yarn structure cannot be changed to produce ultra-low twist yarn for soft fabrics and the fabric texture is unclear under ultra-low twist, and to provide a spinning method that changes the yarn structure.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A spinning method that alters the yarn structure involves sequentially setting a first circular belt and a second circular belt between the front roller and the guide hook of a spinning frame. The yarn sliver formed after the roving is drafted is output from the front roller, first tilting downward at an angle Φ (i.e. at an angle Φ with the conveying path of the yarn sliver before it is conveyed to the front roller) to pass under the first circular belt to form spinning section I, then passing over the second circular belt to form spinning section II, and finally being wound around the guide hook to obtain yarn.

[0010] The first and second circular belts move laterally, respectively applying tangential frictional force to the contacted yarn slivers;

[0011] The linear speed ratio (V1 / V2, i.e., the ratio of linear speeds) of the first and second circular belts is 1.5 to 8.5. Yarns spun within this range have a larger measured twist coefficient.

[0012] Φ is 15°-30°, the surrounding angle θ1 formed by the yarn strand and the first circular belt is 45°-60°, the surrounding angle θ2 formed by the yarn strand and the second circular belt is 60°-75°, and θ1 < θ2;

[0013] The sizes of θ1 and θ2 affect false twist efficiency. In theory, the greater the surrounding angle, the higher the false twist efficiency, and the more conducive to yarn formation in the state of ultra-low twist yarn. However, considering the actual production, the greater the surrounding angle, the more difficult the yarn joint, and therefore the above surrounding angles are set.

[0014] As a preferred technical solution:

[0015] The spinning method for changing the structure of a yarn as described above, when the yarn is Z-twisted, the first circular belt moves horizontally to the left, and the second circular belt moves horizontally to the right; when the yarn is S-twisted, the first circular belt moves horizontally to the right, and the second circular belt moves horizontally to the left.

[0016] The spinning method for changing the structure of a yarn as described above, the speeds of the first circular belt and the second circular belt are independently controlled.

[0017] The spinning method for changing the structure of a yarn as described above, the yarn strand is made of one or more of natural fibers (cotton, hemp, silk, etc.) and man-made fibers (viscose, tencel, modal, polyester, nylon, etc.).

[0018] The spinning method for changing the structure of a yarn as described above, the twist factor of the roving is 102-105, and the basis weight is 4-10 g / 10 m.

[0019] The spinning method for changing the structure of a yarn as described above, the center distance between the first circular belt and the front roller is 5-44 mm, the center distance between the second circular belt and the front roller is 9-60 mm, the center distance between the first circular belt and the second circular belt is 4-16 mm, the speed ratio of the first circular belt to the front roller is 1-21, and the speed ratio of the second circular belt to the front roller is 0.7-14.

[0020] The spinning method for changing the structure of a yarn as described in any one of the above, the designed twist factor of the yarn is 190-270, and the measured twist factor is 191-295, which is an ultra-low twist yarn. However, when the prior art method produces an ultra-low twist yarn, the yarn strand between the front roller and the guide hook does not receive enough tension, resulting in failure to form a yarn.

[0021] To overcome the defect that the broken ends of the ultra-low twist yarn cannot form a yarn, firstly, the yarn stubs between the two round belts and the guide hook are contacted and tangential friction force is generated to increase the spinning tension and reduce the broken ends for preparing the ultra-low twist yarn; secondly, the speed of the two round belts and the contact angle of the yarn stubs are controlled so that the friction force generated by the first round belt is greater than that generated by the second round belt, thus the twist of the spinning section I is greater than that of the spinning section II, and the twist directions of the two sections are opposite, therefore, the dynamic twist in the spinning process is slowly released to obtain the relatively uniform structure (the centralization range of the radial packing density is increased) and soft hand feeling (the bending stiffness is reduced) of the yarn.

[0022] In addition, to avoid the yarn broken ends caused by the excessive spinning tension, the linear speed ratio of each round belt to the front roller is preferably 1-21, meanwhile, considering the yarn joint problem, the included angle θ1 formed by the yarn stub and the first round belt is 45-60°, the included angle θ2 formed by the yarn stub and the second round belt is 60-75°, and θ1<θ2, and the actual twist factor is 191-295, compared with the prior art, the twist factor of the fiber in the yarn is greater, thus the cloth surface pattern obtained by weaving is clearer.

[0023] The yarn diameter is increased by 5-25% compared with the comparative sample, the preparation method of the comparative sample is basically the same as that of the yarn, the difference is that the yarn stub formed after the roving is stretched is directly fed into the guide hook after being output from the front roller and then wound.

[0024] The axial spiral trajectory radius of the fiber in the yarn is 3-20% of the yarn diameter, and the centralization range of the radial packing density of the fiber in the yarn is 45-55% of the yarn radius.

[0025] The spinning method for changing the yarn structure as described above, the yarn is pure yarn, blended yarn or composite yarn, and the designed count of the yarn is 6S-32S.

[0026] The spinning method for changing the yarn structure as described above, when the material of the yarn is cotton, the relative bending stiffness is 1.7×10 -4 -3.5×10 -4 gf·cm·tex -1 , the breaking strength is 12.5-16.5 cN / tex; when the material of the yarn is hemp, the relative bending stiffness is 4.5×10 -4 -9.5×10 -4 gf·cm·tex -1 , the breaking strength is 16-26 cN / tex; when the material of the yarn is silk, the relative bending stiffness is 2.5×10 -4 -3.1×10 -4 gf·cm·tex -1, the relative bending stiffness is 2.0*10 -4 ~3.1*10 -4 gf*cm*tex -1 , the breaking strength is 12~14 cN / tex, and the relative bending stiffness is 1.1*10 -4 ~1.5*10 -4 gf*cm*tex -1 , the breaking strength is 6~9 cN / tex, and the relative bending stiffness is 1.3*10 -4 ~1.5*10 -4 gf*cm*tex -1 , the breaking strength is 23~35 cN / tex, and the relative bending stiffness is 1.1*10 -4 ~3.5*10 -4 gf*cm*tex -1 , the breaking strength is 10~13 cN / tex, and the relative bending stiffness is 1.3*10 -4 ~3.5*10 -4 gf*cm*tex -1 , the breaking strength is 18~25 cN / tex, and the relative bending stiffness is 5.5*10 -4 ~5.8*10 - 4 gf*cm*tex -1 , the breaking strength is 25~30 cN / tex.

[0027] Invention principle:

[0028] Under the condition of super low twist, the yarn must be broken in the spinning process due to insufficient yarn forming tension, and the spinnability is poor, and the twist factor of the yarn is small, and the fabric pattern is not clear.

[0029] The application creatively designs a spinning method for changing the structure of yarn, and the sliver is twisted-twisted untwisted twice under the action of two round belts (the first round belt has a twisting effect on the sliver above the first round belt and an untwisting effect on the sliver below the first round belt after the first round belt contacts the yarn; the second round belt has the same effect), the twisting effect increases the dynamic twist of the yarn near the nip of the front roller, provides sufficient yarn-forming tension for the formed yarn, and thus can produce ultra-low twist yarn (twist factor 190-270) with less yarn breakage; under the repeated untwisting effect, the spiral track radius of the yarn is reduced, the structure of the yarn is fluffy, the diameter of the yarn is increased, and the hand feeling of the yarn body is soft. By controlling the different degrees of the two times of twisting-untwisting, the degree of the decrease of the dynamic twist in the spinning process is reduced, the torque is slowly released when the yarn is formed, the yarn-forming tension is stable, and the quality of the formed yarn is ensured. At the same time, due to the friction of the two round belts on the surface of the yarn body, the measured twist factor of the yarn is increased, and the fabric grain is clear. The yarn spinning method is easy to operate, the softness and fluffiness of the yarn are obviously improved, and the fabric grain is clear.

[0030] Advantages:

[0031] (1) The spinning method for changing the structure of yarn of the application, the sliver is twisted-twisted untwisted twice under the action of two round belts, the twisting effect increases the dynamic twist of the yarn near the nip of the front roller, provides sufficient yarn-forming tension for the formed yarn, and thus can produce ultra-low twist yarn (twist factor 190-270) with less yarn breakage;

[0032] (2) The yarn produced by the application is fluffy, soft in hand feeling, and clear in fabric grain;

[0033] (3) The spinning method for changing the structure of yarn of the application is easy to operate, the softness and fluffiness of the yarn are obviously improved, the twist factor of the yarn is increased, and the fabric grain is clear. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a schematic diagram for preparing the yarn of the application;

[0035] Figure 2 It is a side view of the spinning path of the sliver of the yarn from the front roller to the second round belt;

[0036] Figure 3 It is a schematic diagram of the spatial position of the first round belt and the second round belt;

[0037] Figure 4 It is a comparison diagram of the axial morphology of the yarn of comparative sample 1 and example 1;

[0038] Figure 5 It is a comparison diagram of the radial morphology of the yarn of comparative sample 4 and example 4;

[0039] Figure 6 It is a comparison diagram of the packing density distribution of the yarn of comparative sample 1 and example 1;

[0040] Figure 7 A comparison diagram showing the degree of inclination of the surface fibers of Comparative Sample 9 and Example 9;

[0041] Figure 8 This is a schematic diagram of the yarn preparation mechanism of the present invention;

[0042] Among them, 1-yarn sliver, 2-front roller, 3-first circular belt, 4-second circular belt, 5-yarn guide hook, 6-yarn. Detailed Implementation

[0043] 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.

[0044] The testing method of this invention is as follows:

[0045] Radial packing density centering range: After obtaining the yarn cross-section using CT scan, the radial packing density of fibers in the yarn is calculated using the equidistant concentric circle method. From the center of the yarn to the outer perimeter, when the fiber packing density in a certain ring first exceeds the packing density in the adjacent outer ring by 0.05, the radius range of this ring is defined as the radial packing density centering range of the yarn.

[0046] Relative bending stiffness: tested using a KES-FB2-S bending tester.

[0047] Breaking strength: According to GB / T 3916-2013 (Determination of breaking strength and elongation at break of single yarn in packaged textiles (CRE method)), the YYG063 fully automatic single yarn strength tester was used for testing.

[0048] Example 1

[0049] A spinning method that modifies the yarn structure, wherein the yarn is designed with a count of 6S and a twist coefficient of 200, such as... Figure 1 As shown, the specific spinning process is as follows:

[0050] like Figure 2 , 3 As shown, a first circular belt 3 and a second circular belt are sequentially arranged between the front roller 2 and the guide hook 5 of the spinning machine. The cotton roving is drafted to form a yarn sliver 1, which is output from the front roller 2. It first tilts downward 15° and passes under the first circular belt 3 to form spinning section I, and then passes over the second circular belt to form spinning section II. After passing through the guide hook 5, it is wound to obtain cotton yarn 6.

[0051] The first and second circular belts 3 and 4 move transversely to apply tangential friction to the yarn strand 1 contacted; the cotton yarn 6 is Z-twisted, the first circular belt 3 moves horizontally to the left, and the second circular belt 4 moves horizontally to the right;

[0052] The roving has a twist factor of 102 and a basis weight of 10 g / 10 m; the surrounding angle θ1 formed by the yarn strand 1 and the first circular belt 3 is 45°, and the surrounding angle θ2 formed by the yarn strand 1 and the second circular belt 4 is 60°; the center distance between the first circular belt 3 and the front roller 2 is 5 mm, the center distance between the second circular belt 4 and the front roller 2 is 21 mm, and the center distance between the first circular belt 3 and the second circular belt 4 is 16 mm; the speeds of the first circular belt 3 and the second circular belt 4 are independently controlled, the speed ratio of the first circular belt 3 to the front roller 2 is 21, the speed ratio of the second circular belt 4 to the front roller 2 is 2.5, and the linear speed ratio of the first circular belt 3 to the second circular belt 4 is 8.4;

[0053] A comparative sample 1 is prepared by the same method as above, except that the cotton roving is directly fed into the guide hook after being output from the front roller and then wound up, and the material of the cotton roving is cotton; the average diameter of the prepared comparative sample 1 is 374 μm;

[0054] The measured count of the prepared cotton yarn is 6S, and the measured twist factor is 205; as shown in Figure 4 , the average diameter of the cotton yarn is 468 μm, which is increased by 25% compared with the comparative sample 1; the average diameter of the cotton yarn is obviously larger than that of the comparative sample 1, and the fiber distribution in the yarn is relatively loose, which makes the cotton yarn fluffy and soft in hand feeling. The axial spiral trajectory radius of the fiber in the cotton yarn is 20% of the diameter of the cotton yarn, and the radial packing density centralization range of the fiber in the cotton yarn is 55% of the radius of the cotton yarn; the relative bending stiffness of the cotton yarn is 1.7 x 10 -4 gf·cm·tex -1 , and the breaking strength is 13 cN / tex.

[0055] As shown in Figure 6 , the packing density centralization range of the comparative sample 1 is concentrated near the core position (0 on the horizontal axis), the packing density centralization range of the yarn is concentrated within 50% of the radius of the yarn, and the fiber packing density of the yarn is relatively uniform from the core to the surface of the yarn (500 on the horizontal axis), especially within 0-200 pixels, which indicates that the fiber distribution in the yarn is relatively dispersed, which will lead to the fluffiness of the yarn and enhance the softness of the yarn.

[0056] Example 2

[0057] A spinning method for changing the structure of a yarn, the designed count of the yarn is 7S, and the designed twist factor is 220, and the specific spinning process is as follows:

[0058] A first circular belt and a second circular belt are arranged in sequence between the front roller and the guide hook of the spinning frame, the yarn sliver formed by the drafted roving of the material of silk is output from the front roller, firstly inclined downward by 15° to form spinning section I by passing under the first circular belt, and then form spinning section II by passing over the second circular belt, and is wound after the guide hook to obtain the silk yarn;

[0059] The first circular belt and the second circular belt move horizontally and respectively apply tangential friction to the yarn sliver contacted; the silk yarn is S-twisted, the first circular belt moves horizontally to the right, and the second circular belt moves horizontally to the left;

[0060] The twist factor of the roving is 102, and the basis weight is 8 g / 10 m; the included angle θ1 formed by the yarn sliver and the first circular belt is 45°, and the included angle θ2 formed by the yarn sliver and the second circular belt is 60°; the center distance between the first circular belt and the front roller is 10 mm, the center distance between the second circular belt and the front roller is 14 mm, the center distance between the first circular belt and the second circular belt is 4 mm, the speeds of the first circular belt and the second circular belt are independently controlled, the speed ratio of the first circular belt to the front roller is 16, the speed ratio of the second circular belt to the front roller is 10, and the linear speed ratio of the first circular belt to the second circular belt is 1.6;

[0061] A comparative sample 2 is prepared by the same method as above, except that the yarn sliver formed by the drafted roving of the material of silk is directly fed into the guide hook after being output from the front roller; the average diameter of the prepared comparative sample 2 is 266 μm;

[0062] The measured count of the prepared silk yarn is 7S, and the measured twist factor is 228; the average diameter of the silk yarn is 319 μm, which is increased by 20% compared with the comparative sample 2; the axial spiral trajectory radius of the fiber in the silk yarn is 16% of the diameter of the silk yarn, the radial packing density center range of the fiber in the silk yarn is 53% of the radius of the silk yarn; the relative bending stiffness of the silk yarn is 4.8×10 -4 gf·cm·tex -1 , and the breaking strength is 18 cN / tex.

[0063] Example 3

[0064] A spinning method for changing the structure of a yarn, the designed count of the yarn is 16S, and the designed twist factor is 230, and the specific spinning process is as follows:

[0065] A first circular belt and a second circular belt are arranged in sequence between the front roller and the guide hook of the spinning frame, the yarn sliver formed by the drafted roving of the material of silk is output from the front roller, firstly inclined downward by 15° to form spinning section I by passing under the first circular belt, and then form spinning section II by passing over the second circular belt, and is wound after the guide hook to obtain the silk yarn;

[0066] The first circular belt and the second circular belt move horizontally and respectively apply tangential friction to the yarn strand contacted thereby; the silk yarn is Z-twisted, the first circular belt moves horizontally to the left, and the second circular belt moves horizontally to the right;

[0067] The twist factor of the roving is 103, and the basis weight is 6 g / 10 m; the surrounding angle θ1 formed by the yarn strand and the first circular belt is 45°, and the surrounding angle θ2 formed by the yarn strand and the second circular belt is 60°; the center distance between the first circular belt and the front roller is 20 mm, the center distance between the second circular belt and the front roller is 26 mm, the center distance between the first circular belt and the second circular belt is 6 mm, the speed of the first circular belt and the second circular belt is independently controlled, the speed ratio of the first circular belt and the front roller is 10, the speed ratio of the second circular belt and the front roller is 6, and the linear speed ratio of the first circular belt and the second circular belt is 1.7;

[0068] The comparative sample 3 is prepared by the same method as above except that the roving of silk is directly wound after being fed into the guide hook after being output from the front roller; the average diameter of the comparative sample 3 is 246 μm;

[0069] The measured count of the prepared silk yarn is 16 S, and the measured twist factor is 234; the average diameter of the silk yarn is 283 μm, which is increased by 15% compared with the comparative sample 3; the axial spiral trajectory radius of the fiber in the silk yarn is 13% of the diameter of the silk yarn, the radial packing density center range of the fiber in the silk yarn is 50% of the radius of the silk yarn; the relative bending stiffness of the silk yarn is 2.9 x 10 -4 gf·cm·tex -1 , and the breaking strength is 19 cN / tex.

[0070] Example 4

[0071] A spinning method for changing the structure of a yarn, the designed count of the yarn is 16 S, and the designed twist factor is 190, and the specific spinning process is as follows:

[0072] A first circular belt and a second circular belt are sequentially arranged between the front roller and the guide hook of the spinning frame, the yarn strand formed by the roving of viscose after being stretched is output from the front roller, first inclined downward by 15° to pass the first circular belt to form spinning section I, then passes the second circular belt to form spinning section II, and is wound after the guide hook to obtain the viscose yarn;

[0073] The first circular belt and the second circular belt move horizontally and respectively apply tangential friction to the yarn strand contacted thereby; the silk yarn is Z-twisted, the first circular belt moves horizontally to the left, and the second circular belt moves horizontally to the right;

[0074] The roving has a twist coefficient of 103 and a basis weight of 6 g / 10m; the encirclement angle θ1 formed by the yarn sliver in contact with the first circular belt is 45°, and the encirclement angle θ2 formed by the yarn sliver in contact with the second circular belt is 60°; the center distance between the first circular belt and the front roller is 30 mm, the center distance between the second circular belt and the front roller is 38 mm, the center distance between the first and second circular belts is 8 mm, the speeds of the first and second circular belts are independently controlled, the speed ratio of the first circular belt to the linear speed of the front roller is 18, the speed ratio of the second circular belt to the linear speed of the front roller is 9, and the linear speed ratio of the first and second circular belts is 2.

[0075] Comparative sample 4 was prepared using a method basically the same as the viscose yarn described above, except that the sliver formed from the viscose roving after drafting was directly fed into the guide hook and wound after being output from the front roller; for example... Figure 5 As shown, the average diameter of the prepared control sample 4 was 230 μm;

[0076] The measured yarn count was 16S, and the measured twist coefficient was 191; Figure 5 As shown, the average diameter of the viscose yarn is 253 μm, which is 10% higher than that of control sample 4; the axial helical trajectory radius of the fibers in the viscose yarn is 9% of the yarn diameter; the radial packing density of the fibers in the viscose yarn is centered at 46% of the yarn radius; and the relative bending stiffness of the viscose yarn is 2.0 × 10⁻⁶. -4 gf·cm·tex -1 The fracture strength is 13 cN / tex.

[0077] Example 5

[0078] A spinning method for altering yarn structure, wherein the yarn is designed with a count of 16S and a twist coefficient of 270, and the specific spinning process is as follows:

[0079] A first circular belt and a second circular belt are set sequentially between the front roller and the guide hook of the spinning machine. The yarn sliver formed by the drafting of the wool roving is output from the front roller, first tilted downward 15° and passed under the first circular belt to form spinning section I, then passed over the second circular belt to form spinning section II, and then wound after passing through the guide hook to obtain wool yarn.

[0080] The first and second circular belts move laterally, applying tangential friction to the contacted yarn slivers respectively; the wool yarn is Z-twist, the first circular belt moves horizontally to the left, and the second circular belt moves horizontally to the right;

[0081] The roving has a twist factor of 104 and a basis weight of 6 g / 10 m; the yarn strand forms an encompassing angle θ1 of 45° with the first circular belt and an encompassing angle θ2 of 60° with the second circular belt; the first circular belt has a center distance of 30 mm from the front roller, the second circular belt has a center distance of 38 mm from the front roller, the center distance between the first circular belt and the second circular belt is 8 mm, the speeds of the first circular belt and the second circular belt are independently controlled, the speed ratio of the first circular belt to the front roller is 12, the speed ratio of the second circular belt to the front roller is 4, and the speed ratio of the first circular belt to the second circular belt is 3;

[0082] A comparative sample 5 is prepared by the same method as above, except that the yarn strand formed by the drawn roving of wool is directly fed into the guide hook after being output from the front roller and then wound;

[0083] The average diameter of the prepared wool yarn is 241 μm; -4 gf·cm·tex -1 The relative bending stiffness of the wool yarn is 1.2×10

[0084] Example 6

[0085] A spinning method for changing the structure of a yarn, the designed count of the yarn is 32S and the designed twist factor is 270, and the specific spinning process is as follows:

[0086] A first circular belt and a second circular belt are sequentially arranged between the front roller and the guide hook of the spinning frame, the yarn strand formed by the drawn roving of nylon is output from the front roller, first inclined downward by 20° to pass the first circular belt to form a spinning section I, then passes the second circular belt to form a spinning section II, and is wound after the guide hook to obtain a nylon yarn;

[0087] The first circular belt and the second circular belt move horizontally and respectively apply a tangential friction force to the yarn strand in contact; the nylon yarn is Z-twisted, the first circular belt moves horizontally to the left, and the second circular belt moves horizontally to the right;

[0088] The roving has a twist factor of 104 and a basis weight of 4.8 g / 10 m; the yarn strand forms an encompassing angle θ1 of 50° with the first circular belt and an encompassing angle θ2 of 70° with the second circular belt; the first circular belt has a center distance of 35 mm from the front roller, the second circular belt has a center distance of 45 mm from the front roller, the center distance between the first circular belt and the second circular belt is 10 mm, the speeds of the first circular belt and the second circular belt are independently controlled, the speed ratio of the first circular belt to the front roller is 12, the speed ratio of the second circular belt to the front roller is 4, and the speed ratio of the first circular belt to the second circular belt is 3;

[0089] A comparative sample 6 is prepared, and the preparation method of the comparative sample 6 is basically the same as that of the above polyamide / polyamide yarn, except that the yarn strand formed by the polyamide roving after drafting is directly fed into the guide hook after being output from the front roller and then wound; the average diameter of the prepared comparative sample 6 is 129 μm;

[0090] The actual number of the prepared polyamide yarn is 32 S, and the actual twist factor is 280; the average diameter of the polyamide yarn is 139 μm, which is increased by 8% compared with the comparative sample 6; the axial spiral trajectory radius of the fiber in the polyamide yarn is 6% of the diameter of the polyamide yarn, the radial packing density center range of the fiber in the polyamide yarn is 46% of the radius of the polyamide yarn; the relative bending stiffness of the polyamide yarn is 1.4×10 -4 gf·cm·tex -1 , and the breaking strength is 23 cN / tex.

[0091] Example 7

[0092] A spinning method for changing the structure of a yarn, the designed number of the yarn is 32 S, and the designed twist factor is 270, and the specific spinning process is as follows:

[0093] A first circular belt and a second circular belt are sequentially arranged between the front roller and the guide hook of the spinning frame, the yarn strand formed by the roving of wool and cotton (mass ratio 20 / 80) after drafting is output from the front roller, first tilts downward by 20° to form spinning section I by passing under the first circular belt, and then forms spinning section II by passing over the second circular belt, and is wound after the guide hook to obtain a wool / cotton blended yarn;

[0094] The first circular belt and the second circular belt move horizontally and respectively apply a tangential friction force to the yarn strand in contact; the wool / cotton blended yarn is Z-twisted, the first circular belt moves horizontally to the left, and the second circular belt moves horizontally to the right;

[0095] The twist factor of the roving is 105, the basis weight is 4.5 g / 10 m; the surrounding angle θ1 formed by the yarn strand and the first circular belt is 50°, the surrounding angle θ2 formed by the yarn strand and the second circular belt is 70°; the center distance between the first circular belt and the front roller is 35 mm, the center distance between the second circular belt and the front roller is 45 mm, the center distance between the first circular belt and the second circular belt is 10 mm, the speeds of the first circular belt and the second circular belt are independently controlled, the speed ratio of the first circular belt and the front roller is 10, the speed ratio of the second circular belt and the front roller is 3, and the linear speed ratio of the first circular belt and the second circular belt is 3.3;

[0096] A comparative sample 7 is prepared, and the preparation method of the comparative sample 7 is basically the same as that of the wool / cotton blended yarn described above, except that the yarn strand formed by the roving of wool and cotton (mass ratio 20 / 80) after drafting is directly wound after being fed into the guide hook after being output from the front roller; the average diameter of the prepared comparative sample 7 is 160 μm;

[0097] The actual count of the prepared wool / cotton yarn is 32 S, and the actual twist factor is 282; the average diameter of the wool / cotton yarn is 170 μm, which is increased by 6% compared with the comparative sample 7; the axial spiral trajectory radius of the fiber in the wool / cotton yarn is 5% of the diameter of the wool / cotton yarn, and the radial packing density centering range of the fiber in the wool / cotton yarn is 43% of the radius of the wool / cotton yarn; the relative bending stiffness of the wool / cotton yarn is 1.8×10 -4 gf·cm·tex -1 , and the breaking strength is 12 cN / tex.

[0098] Example 8

[0099] A spinning method for changing the structure of a yarn, the designed count of the yarn is 32 S, and the designed twist factor is 270, and the specific spinning process is as follows:

[0100] A first circular belt and a second circular belt are sequentially arranged between the front roller and the guide hook of the spinning frame, the yarn strand formed by the roving of nylon and cotton (mass ratio 50 / 50) after drafting is output from the front roller, first tilts downward by 30° to pass the first circular belt below to form spinning section I, and then passes the second circular belt above to form spinning section II, and is wound after the guide hook to obtain a nylon / cotton blended yarn;

[0101] The first circular belt and the second circular belt move horizontally and respectively apply tangential friction to the yarn strands contacted; the nylon / cotton blended yarn is Z-twisted, the first circular belt moves horizontally to the left, and the second circular belt moves horizontally to the right;

[0102] The roving has a twist factor of 105 and a basis weight of 4.5 g / 10 m; the yarn strand forms an encircling angle θ1 of 60° with the first circular belt and an encircling angle θ2 of 75° with the second circular belt; the first circular belt has a center distance of 40 mm from the front roller, the second circular belt has a center distance of 52 mm from the front roller, the center distance between the first circular belt and the second circular belt is 12 mm, the speeds of the first circular belt and the second circular belt are independently controlled, the speed ratio of the first circular belt to the front roller is 6, the speed ratio of the second circular belt to the front roller is 2, and the speed ratio of the first circular belt to the second circular belt is 3;

[0103] A comparative sample 8 is prepared by the same method as above, except that the roving of nylon and cotton (mass ratio 50 / 50) is directly fed into the guide hook after being output from the front roller and then wound after forming a yarn strand by drafting.

[0104] The average diameter of the prepared nylon / cotton blended yarn is 180 μm, which is increased by 5% compared with the comparative sample 8; the axial spiral trajectory radius of the fiber in the nylon / cotton blended yarn is 5% of the diameter of the nylon / cotton blended yarn; the radial packing density center range of the fiber in the nylon / cotton blended yarn is 45% of the radius of the nylon / cotton blended yarn; the relative bending stiffness of the nylon / cotton blended yarn is 1.7×10 -4 gf·cm·tex -1 , and the breaking strength is 18 cN / tex.

[0105] Example 9

[0106] A spinning method for changing the structure of a yarn, the designed number of the yarn is 32S, and the designed twist factor is 270, and the specific spinning process is as follows:

[0107] A first circular belt and a second circular belt are sequentially arranged between the front roller and the guide hook of the spinning frame; the yarn strand formed by the polyester roving after drafting is output from the front roller, first tilts downward by 30° to form a spinning section I by passing under the first circular belt, then passes over the second circular belt to form a spinning section II, and is wound after passing through the guide hook to obtain a polyester yarn.

[0108] The first circular belt and the second circular belt move horizontally and respectively apply a tangential friction force to the yarn strand in contact; the polyester yarn is S-twisted, the first circular belt moves horizontally to the right, and the second circular belt moves horizontally to the left.

[0109] The twist factor of the roving is 105, the basis weight is 4 g / 10 m; the surrounding angle θ1 formed by the yarn strand and the first circular belt is 60°, the surrounding angle θ2 formed by the yarn strand and the second circular belt is 75°; the center distance between the first circular belt and the front roller is 44 mm, the center distance between the second circular belt and the front roller is 60 mm, the center distance between the first circular belt and the second circular belt is 16 mm, the speeds of the first circular belt and the second circular belt are independently controlled, the speed ratio of the first circular belt to the front roller is 1, the speed ratio of the second circular belt to the front roller is 0.7, and the speed ratio of the first circular belt to the second circular belt is 1.43;

[0110] Preparation of Comparative Sample 9, the preparation method of Comparative Sample 9 is basically the same as the above polyester yarn, the difference is that the yarn strand formed by the polyester roving after drafting is directly fed into the guide hook after being output from the front roller and then wound; the average diameter of the prepared Comparative Sample 9 is 172 μm;

[0111] The measured number of the prepared yarn is 32 S, and the measured twist factor is 295; the average diameter of the polyester yarn is 181 μm, which is increased by 5% compared with Comparative Sample 9; the axial spiral trajectory radius of the fiber in the polyester yarn is 3% of the diameter of the yarn, the radial packing density center range of the fiber in the polyester yarn is 45% of the radius of the yarn; the relative bending stiffness of the polyester yarn is 5.7×10 -4 gf·cm·tex -1 , and the breaking strength is 27 cN / tex.

[0112] As shown in Figure 7 , under the same design twist, the inclination degree of the surface fiber of the polyester yarn is greater than that of the comparative sample, that is, the actual twist factor of the polyester yarn is increased, which makes the cloth surface pattern of the polyester yarn clear.

[0113] Figure 8 is a schematic diagram of the yarn preparation mechanism of the present application. It should be understood that, in addition to the tangential friction force applied to the yarn strand contacted by the first circular belt and the second circular belt in each of the above embodiments, other ways of applying tangential friction force to the yarn strand are also within the protection scope of the present application.

Claims

1. A spinning method for changing the structure of a yarn, characterized by: First and second circular belts are arranged in sequence between front roller and guide hook of spinning frame, yarn sliver formed by roving after drafting is output from front roller, firstly winds around first circular belt below to form spinning section I with downward inclination angle Φ, then winds around second circular belt above to form spinning section II, and is wound to obtain yarn after guide hook; First and second circular belts move horizontally, and tangential friction is applied to yarn sliver contacted respectively; When yarn is Z twist, first circular belt moves horizontally to left, and second circular belt moves horizontally to right; when yarn is S twist, first circular belt moves horizontally to right, and second circular belt moves horizontally to left; Speed ratio of first and second circular belts is 1.5-8.5; Φ is 15°-30°, surrounding angle θ1 formed by yarn sliver and first circular belt is 45°-60°, surrounding angle θ2 formed by yarn sliver and second circular belt is 60°-75°, and θ1<θ2; Design twist factor of yarn is 190-270, and actual measured twist factor is 191-295; Axial spiral track radius of fiber in yarn is 3%-20% of yarn diameter, and radial packing density centering range of fiber in yarn is 45%-55% of yarn radius.

2. A yarn construction altering spinning method according to claim 1, characterized in that, Speed of first and second circular belts is independently controlled.

3. A method of changing the structure of a yarn according to claim 1, characterized in that, Material of yarn sliver is one or more than one of natural fiber and artificial fiber.

4. The yarn construction changing spinning method according to claim 1, wherein Twist factor of roving is 102-105, and basis weight is 4-10 g / 10 m.

5. The yarn construction changing spinning method according to claim 1, wherein Center distance between first circular belt and front roller is 5-44 mm, center distance between second circular belt and front roller is 9-60 mm, center distance between first circular belt and second circular belt is 4-16 mm, speed ratio of first circular belt and front roller is 1-21, and speed ratio of second circular belt and front roller is 0.7-14.

6. A yarn construction altering spinning method according to claim 1, wherein, Yarn is pure spun yarn, blended yarn or composite yarn, and design count of yarn is 6S-32S.

7. A yarn produced by the method of claim 6, wherein When the material of the yarn is cotton, the relative bending stiffness is 1.7 x 10 -4 ~ 3.5 x 10 -4 gf cm tex -1 , the breaking strength is 12.5~16.5 cN / tex; when the material of the yarn is hemp, the relative bending stiffness is 4.5 x 10 -4 ~ 9.5 x 10 -4 gf cm tex -1 , the breaking strength is 16~26 cN / tex; when the material of the yarn is silk, the relative bending stiffness is 2.5 x 10 -4 ~ 3.1 x 10 - 4 gf cm tex -1 , the breaking strength is 18~21 cN / tex; when the material of the yarn is viscose, the relative bending stiffness is 2.0 x 10 -4 ~ 3.1 x 10 -4 gf cm tex -1 , the breaking strength is 12~14 cN / tex; when the material of the yarn is wool, the relative bending stiffness is 1.1 x 10 -4 ~ 1.5 x 10 -4 gf cm tex -1 , the breaking strength is 6~9 cN / tex; when the material of the yarn is nylon, the relative bending stiffness is 1.3 x 10 -4 ~ 1.5 x 10 -4 gf cm tex -1 , the breaking strength is 23~35 cN / tex; when the material of the yarn is wool / cotton blend, the relative bending stiffness is 1.1 x 10 -4 ~ 3.5 x 10 -4 gf cm tex -1 , the breaking strength is 10~13 cN / tex; when the material of the yarn is nylon / cotton blend, the relative bending stiffness is 1.3 x 10 -4 ~ 3.5 x 10 -4 gf cm tex -1 , the breaking strength is 18~25 cN / tex; when the material of the yarn is polyester, the relative bending stiffness is 5.5 x 10 -4 ~ 5.8 x 10 -4 gf cm tex -1 , the breaking strength is 25~30 cN / tex.

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