A spinning method for high-multiple slub yarn

Abstract

The invention belongs to the field of textile technology and relates to a spinning method for high-multiple slub yarn. The method realizes efficient and stable production of high-multiple slub yarn by accurately setting fiber raw materials, spinning parameters and segment control. The high-multiple slub yarn is composed of alternately arranged base yarn segments and slub segments, and the slub segments are composed of transition segments. a , main section, transition section b The invention uses virtual segmentation and actual segmentation technology to ensure that the difference in bamboo node multiples between two adjacent sub-segments is moderate and the amount of fiber fed is not too large. At the same time, the difference in the speed of the feed rollers corresponding to the two adjacent segments is controlled within a certain range to avoid an increase in the spinning breakage rate or a decrease in the yarn quality. The method improves the quality and stability of the yarn.

Description

Technical Field

[0001] The invention belongs to the technical field of textiles and relates to a spinning method of high-multiple slub yarn. Background Art

[0002] In the field of textile technology, slub yarn is widely used in yarn-dyed and various decorative fabrics due to its unique three-dimensional fancy effect. The characteristic of slub yarn is that single yarn with thick or thin sections in the length direction appears. These thick and thin sections are called slubs. The appearance of slubs can be regular or irregular, which brings rich visual effects to the fabric.

[0003] With the continuous development of textile technology, the market demand for high-multiple slub yarn is growing. High-multiple slub yarn can further enhance the three-dimensional sense and fancy effect of fabrics, providing more possibilities for the innovation and design of textiles. Therefore, it is particularly important to develop a method for efficiently spinning high-multiple slub yarn.

[0004] At present, the main method for producing bamboo yarn is the rotor spinning method, including the groove method, the damping point method, the controller method and the digital transformation method. The groove method is to set grooves on the sliding surface of the spinning rotor, and the fibers gather here to form thick sections. The damping point method is to add damping points in the condensation groove so that the fibers gather more on the clockwise side to form thick sections. The controller method includes controlling the fiber feeding speed and the yarn delivery roller speed. The former changes the input amount to change the fiber amount in the rotor over time, and the latter changes the output length of the slivers of equal amount of fibers to form bamboo sections. Changing both at the same time can achieve superimposed effects. The digital transformation method is a new type of equipment that adds a spinning system or control system to an ordinary rotor spinning machine.

[0005] However, the above methods have limitations when spinning high-multiple bamboo yarn. When the bamboo multiple reaches 5 times or more, it is difficult to spin bamboos of 5 times or more by the groove method because the thickness of the rotor wall is only at the millimeter level; if the damping point method is used to spin high-multiple bamboo yarn, the required damping point volume is large, which is easy to affect the balance of the rotor when rotating, and dust is easy to accumulate on both sides of the damping point, resulting in weak strength of the details after the thick section, thus affecting the yarn quality; the controller method controls the instantaneous feeding of excessive fiber in a single combing, which may cause the fiber bundle to not be well combed, thereby affecting the yarn quality; at the same time, the higher the bamboo multiple, the longer the transition section required; and the controller method controls the yarn feeding speed, which may damage related devices due to frequent speed regulation; the digital transformation method still has only one fiber delivery channel, so it has similar limitations as the method of changing the feeding speed through the controller, and it is also impossible to spin high-multiple bamboo yarn.

[0006] Therefore, there is an urgent need for a new method that can overcome the limitations of existing technologies and achieve high-multiple slub yarn spinning. Summary of the invention

[0007] The purpose of the invention is to solve the problems existing in the prior art and provide a spinning method for high-multiple slub yarn.

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

[0009] A spinning method for high-multiple slub yarn, the high-multiple slub yarn is composed of alternately arranged base yarn segments and slub segments, the slub segment is formed by sequentially connecting a transition segment a, a main segment, and a transition segment b, and the spinning adopts double-feed double-combing rotor spinning technology, and the specific process is: first, selecting fiber raw materials, spinning parameters and equipment parameters according to spinning requirements; then, calculating the length of transition segment a, the length of transition segment b, the feed roller speed corresponding to the base yarn segment, and the feed roller speed corresponding to the main segment; then, virtually segmenting the transition segment a, and calculating the feed roller speed corresponding to each sub-segment, determining whether to actually segment the transition segment a according to the slub multiple of the main segment, and determining the slub multiple of the transition segment a and the corresponding feed roller speed according to the virtual segmentation result, and setting the parameters of the transition segment b the same as those of the transition segment a; finally, spinning according to the above parameters to obtain the high-multiple slub yarn.

[0010] As the preferred technical solution:

[0011] The spinning method of the high-multiple slub yarn as described above comprises the following specific steps:

[0012] (1) Select the fiber raw material and set the left side feeding fiber strip quantity Q l , right side feeding fiber strip quantitative Q r , Base yarn segment linear density D j , base yarn length L j , bamboo segment length L z , main body length L zm , Main section bamboo multiples BR zm , the proportion of the fiber strip fed into the left side of the base yarn P lj , the proportion of fiber strips fed into the right side of the base yarn P rj , the proportion of fiber strips fed into the left side of the main section P lzm , the proportion of fiber strips fed into the right side of the main section P rzm , rotor speed n, left combing roller speed, right combing roller speed, left combing roller model, right combing roller model, rotor diameter, rotor negative pressure, twist coefficient α, feed roller radius R (the radii of each feed roller in the present invention are the same);

[0013] L zm ≥0.06m;

[0014] (2) Calculate the length L of the transition section a za , Transition section b length L zb , the formula is: L za =L zb=(L z -L zm ) / 2;

[0015] Calculate the feed roller speed S corresponding to the base yarn section dj , d is l or r, S lj Represents the left feeding roller speed corresponding to the base yarn section, S rj Represents the right feeding roller speed corresponding to the base yarn section, S dj The calculation formula is as follows:

[0016] S dj =v×D j ×P dj / (2π×R×Q d );

[0017] v = n / T;

[0018] T=α / D j -1 / 2 ;

[0019] In the formula, S dj The unit is r / min; n is r / min; D j The unit is tex; R is m; Q d The unit is g·5m -1 , d is l or r; P dj Where d is l or r; v is the yarn delivery speed, the unit is m / min; T is the yarn twist, the unit is twist / m;

[0020] Calculate the feed roller speed S corresponding to the main section dzm , d is l or r, S lzm Represents the left feeding roller speed corresponding to the main section, S rzm Represents the right feeding roller speed corresponding to the main section, S dzm The calculation formula is as follows:

[0021] S dzm =v×D zm ×P dzm / (2π×R×Q d );

[0022] v = n / T;

[0023] T=α / D zm -1 / 2 ;

[0024] D zm =D j ×BR zm ;

[0025] In the formula, S dzmThe unit is r / min; n is r / min; D j The unit is tex; R is m; Q d The unit is g·5m -1 , d is l or r; P dzm Where d is l or r; v is the yarn delivery speed, the unit is m / min; T is the yarn twist, the unit is twist / m; D zm is the linear density of the main segment, in tex;

[0026] (3) Virtually segment the transition segment a to obtain f sub-segments arranged in sequence from the base yarn segment to the main segment. The bamboo node multiple of the first sub-segment is 1.5, and the bamboo node multiple of the fth sub-segment is BR zm -0.5, the difference between the bamboo node multiples of two adjacent sub-segments is 0.5, calculate the linear density D of the i-th sub-segment zai , i=1,2,…,f;

[0027] (4) Calculate the feed roller speed S corresponding to the i-th sub-segment dzai , d is l or r, S lzai represents the left feeding roller speed corresponding to the i-th sub-segment, S rzai represents the speed of the right feeding roller corresponding to the i-th sub-segment, S dzai The calculation formula is as follows:

[0028] S dzai =v×D zai ×P dzai / (2π×R×Q d );

[0029] v = n / T;

[0030] T=α / D zai -1 / 2 ;

[0031] P dzai =[(P dzm -P dj ) / ((BR zm -1)×2)×i+P dj ] / (1+0.5×i);

[0032] In the formula, S dzai The unit is r / min; n is r / min; D zai The unit is tex; R is m; Q d The unit is g·5m -1 , d is l or r; P dzm Where d is l or r; P dj Where d is l or r; v is the yarn delivery speed, the unit is m / min; T is the yarn twist, the unit is twist / m; P dzaiWhere d is l or r, P lzai is the proportion of fiber strips fed into the left side of the i-th sub-segment, P rzai is the proportion of fiber strips fed into the right side of the i-th sub-segment;

[0033] P lzai , P rzai These two values ​​change with the number of bamboo nodes in the sub-segment, as shown below:

[0034] Feed adhesive strip on the left side and cotton strip on the right side, BR zm The base yarn segment is composed of 100% viscose and 0% cotton, the main segment is composed of 100% viscose and 600% cotton, the number of sub-segments is 11, the bamboo node multiple of the 8th sub-segment is 5, and the 8th sub-segment is theoretically composed of 100% viscose and 400% cotton. The left feeding ratio P lza8 =[(1-1) / ((7-1)×2)×8+1] / (1+0.5×8)=1 / 5, right side feeding ratio P rza8 =[(6-0) / ((7-1)×2)×8+0] / (1+0.5×8)=4 / 5;

[0035] (5) Determine BR zm ≤6 whether it holds true;

[0036] If yes, then the transition segments a and b are not actually segmented, and the bamboo multiples of transition segment a are BR za Set the same sub-segment as the feed roller speed S corresponding to transition segment a. dza Same as this sub-paragraph;

[0037] BR za <BR zm And the difference between the two is <4; S dj dza And the difference between the two is less than 48r / min, S dza dzm And the difference between the two is less than 48r / min;

[0038] Let transition section b bamboo multiple BR zb =BR za , let the feed roller speed S corresponding to transition section b be dzb =S dza ;

[0039] If not, the transition segment a and the transition segment b are actually segmented into two equal segments, so as to obtain transition segment a2, transition segment b2, and transition segment a1 and transition segment b1 connected to the main segment at the same time;

[0040] The transition section a2 bamboo multiple BR za2 ​​Set the same sub-segment as the feed roller speed S corresponding to the transition segment a2. dza2 Same as this sub-section; change the transition section a1 bamboo multiple BR za1 Set the same sub-segment as the feed roller speed S corresponding to the transition segment a1. dza1 Same as this sub-paragraph;

[0041] BR za2 <BR za1 And the difference between the two is less than 4, BR za1 <BR zm And the difference between the two is <4; S dj dza2 And the difference between the two is less than 48r / min, S dza2 dza1 And the difference between the two is less than 48r / min, S dza1 dzm And the difference between the two is less than 48r / min;

[0042] Let the transition section b2 bamboo multiple BR zb2 =BR za2 , let the feed roller speed S corresponding to transition section b2 dzb2 =S dza2 ;

[0043] Let transition section b1 bamboo multiple BR zb1 =BR za1 , let the feed roller speed S corresponding to the transition section b1 dzb1 =S dza1 ;

[0044] The difference in the number of bamboo nodes between two adjacent sub-segments in the bamboo segment of the present invention is less than 4, so that the amount of fiber fed is not too large;

[0045] The present invention controls the difference in the speed of the feed rollers corresponding to two adjacent sections to be less than 48 r / min, because if the difference is too large, the combing roller may not be able to fully comb the fiber bundle, resulting in an increase in the spinning breakage rate or a decrease in the yarn quality;

[0046] When BR zm When BR ≤ 6, the transition section a and the transition section b can be spun either by actually segmenting them or not. However, compared with the former, the latter not only reduces the wear of the spinning device, effectively prolongs its service life, thereby saving production costs, but also ensures that the yarn has better performance. Therefore, the present invention has a better performance in BR zm When ≤6, transition section a and transition section b are not actually segmented;

[0047] When BR zm ​​​When the fiber feeding amount of the base yarn section and the main section is significantly different when the fiber feeding amount of the base yarn section and the main section is >6, the actual segmentation of the transition section a and the transition section b can reduce the pressure of fiber combing at the combing roller and improve the fiber separation degree, which is helpful to reduce the breakage rate and improve the yarn quality;

[0048] (6) Spinning according to the above parameters can obtain high-multiple bamboo yarn.

[0049] In the spinning method of a high-multiple bamboo yarn as described above, the average length of the fibers in the left-side fed fiber strip and the right-side fed fiber strip ranges from 18 to 76 mm. When the average length is less than 18 mm, the entanglement force between the fibers is reduced, and the breaking strength of the yarn is reduced. When the average length is greater than 76 mm, it is difficult for all the fibers to be twisted into the yarn body, resulting in excessive hairiness in the yarn. The absolute value of the difference in the average length of the fibers in the left-side fed fiber strip and the right-side fed fiber strip does not exceed 39 mm. When the difference in the average length is too large, the longer fibers are easily transferred to the surface of the yarn body to form wrapped fibers, thereby affecting the quality and appearance of the yarn.

[0050] In the spinning method of a high-multiple bamboo yarn as described above, the average fineness of the fibers in the left-side fed fiber strip and the right-side fed fiber strip ranges from 1.38 to 1.8 dtex. When the average fineness is less than 1.38 dtex, the fiber strength is low and is easily cut during the combing process. When the average fineness is greater than 1.8 dtex, the fibers are not easily combed into single fibers.

[0051] A spinning method of high-multiple slub yarn as described above, Q l and Q r The value range is 18.2~23g·5m -1 The speed range of the left and right combing rollers is 6000~8500r·min -1 The rotor negative pressure ranges from -6000 to -4200Pa. This setting is conducive to ensuring smooth spinning and reducing the breakage rate.

[0052] A spinning method of high-multiple slub yarn as described above, D j Not less than 40tex, the value range of α is 430-500. Such setting is conducive to ensuring the continuity of spinning and making the quality of the spun yarn stable.

[0053] In the spinning method of a high-density bamboo yarn as described above, n<50000r / min. If n≥50000r / min, the centrifugal force generated when spinning high-density yarn segments is too large, which has an adverse effect on the yarn twist transfer length, cotton knot control, etc., and will greatly increase the yarn introduction speed, resulting in increased friction between the yarn and the device, affecting the yarn quality.

[0054] A spinning method of high-multiple slub yarn as described above, Lj ≥0.2m, L z ≥0.14m, left and right combing rollers are OK61, R<0.06m; L j With L z When the length is too small, the yarn linear density cannot be fully changed to the corresponding linear density; when R is too large, the friction resistance of the feed plate to the fiber strip is too large, and the upper and lower fibers may be delaminated and the bottom fibers may be congested, resulting in reduced yarn quality.

[0055] A spinning method of high-multiple slub yarn as described above, BR zm ≥5.5; BR zm If it is too small, the overall appearance of the yarn and the three-dimensional effect of the woven fabric surface will not be obvious.

[0056] The spinning method of a high-multiple slub yarn as described above can make the yarn have rich colors and 3D visual changes by changing the color, fiber type and feeding ratio of the fiber strips fed on both sides.

[0057] Beneficial effects:

[0058] (1) The present invention significantly reduces the breakage rate during the spinning process by precisely controlling the feed amount of fiber raw materials, spinning parameters and segmented processing, improves the overall quality and stability of the yarn, and ensures the efficient and stable production of high-multiple slub yarn.

[0059] (2) The present invention overcomes the problems of yarn breakage and unstable yarn quality caused by the sharp increase and decrease of fiber amount when spinning high-multiple slub yarn in the prior art, realizes the precise spinning of high-multiple slub yarn, further enhances the three-dimensional sense and fancy effect of the fabric, and provides more possibilities for the innovation and design of textiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 and Figure 2 This is a schematic diagram of the structural design of high-density slub yarn;

[0061] Among them, 1-base yarn segment, 2-bamboo segment, 2.1-transition segment a, 2.2-main body segment, 2.3-transition segment b. DETAILED DESCRIPTION

[0062] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended 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 fall within the scope limited by the appended claims of the application equally.

[0063] A spinning method for high-multiple slub yarn, the specific steps are as follows:

[0064] (1) Design the structure of high-density slub yarn;

[0065] like Figure 1 or Figure 2 As shown, the high-multiple slub yarn is composed of base yarn segments 1 and slub segments 2 arranged alternately, and the slub segment 2 is composed of a transition segment a 2.1, a main segment 2.2, and a transition segment b 2.3 connected in sequence;

[0066] (2) Select the fiber raw material and set the left side feeding fiber strip quantity Q l , right side feeding fiber strip quantitative Q r , Base yarn segment linear density D j , base yarn length L j , bamboo segment length L z , main body length L zm , Main section bamboo multiples BR zm , the proportion of the fiber strip fed into the left side of the base yarn P lj , the proportion of fiber strips fed into the right side of the base yarn P rj , the proportion of fiber strips fed into the left side of the main section P lzm , the proportion of fiber strips fed into the right side of the main section P rzm , rotor speed n, left combing roller speed, right combing roller speed, left combing roller model, right combing roller model, rotor diameter, rotor negative pressure, twist coefficient α, feed roller radius R (the radii of each feed roller are the same);

[0067] (3) Calculate the length L of transition section a za , Transition section b length L zb , the formula is: L za =L zb =(L z -L zm ) / 2;

[0068] Calculate the feed roller speed S corresponding to the base yarn section dj , d is l or r, S lj Represents the left feeding roller speed corresponding to the base yarn section, S rj Represents the right feeding roller speed corresponding to the base yarn section, S dj The calculation formula is as follows:

[0069] S dj =v×D j ×P dj / (2π×R×Q d );

[0070] v = n / T;

[0071] T=α / D j -1 / 2 ;

[0072] In the formula, S dj The unit is r / min; n is r / min; D j The unit is tex; R is m; Q d The unit is g·5m -1 , d is l or r; P dj Where d is l or r; v is the yarn delivery speed, the unit is m / min; T is the yarn twist, the unit is twist / m;

[0073] Calculate the feed roller speed S corresponding to the main section dzm , d is l or r, S lzm Represents the left feeding roller speed corresponding to the main section, S rzm Represents the right feeding roller speed corresponding to the main section, S dzm The calculation formula is as follows:

[0074] S dzm =v×D zm ×P dzm / (2π×R×Q d );

[0075] v = n / T;

[0076] T=α / D zm -1 / 2 ;

[0077] D zm =D j ×BR zm ;

[0078] In the formula, S dzm The unit is r / min; n is r / min; D j The unit is tex; R is m; Q d The unit is g·5m -1 , d is l or r; P dzm Where d is l or r; v is the yarn delivery speed, the unit is m / min; T is the yarn twist, the unit is twist / m; D zm is the linear density of the main segment, in tex;

[0079] (4) Virtually segment the transition segment a to obtain f sub-segments arranged in sequence from the base yarn segment to the main segment. The bamboo node multiple of the first sub-segment is 1.5, and the bamboo node multiple of the fth sub-segment is BR zm -0.5, the difference between the bamboo node multiples of two adjacent sub-segments is 0.5, calculate the linear density D of the i-th sub-segment zai , i=1,2,…,f;

[0080] (5) Calculate the feed roller speed S corresponding to the i-th sub-segment dzai , d is l or r, Slzai represents the left feeding roller speed corresponding to the i-th sub-segment, S rzai represents the speed of the right feeding roller corresponding to the i-th sub-segment, S dzai The calculation formula is as follows:

[0081] S dzai =v×D zai ×P dzai / (2π×R×Q d );

[0082] v = n / T;

[0083] T=α / D zai -1 / 2 ;

[0084] P dzai =[(P dzm -P dj ) / ((BR zm -1)×2)×i+P dj ] / (1+0.5×i);

[0085] In the formula, S dzai The unit is r / min; n is r / min; D zai The unit is tex; R is m; Q d The unit is g·5m -1 , d is l or r; P dzm Where d is l or r; P dj Where d is l or r; v is the yarn delivery speed, the unit is m / min; T is the yarn twist, the unit is twist / m; P dzai Where d is l or r, P lzai is the proportion of fiber strips fed into the left side of the i-th sub-segment, P rzai is the proportion of fiber strips fed into the right side of the i-th sub-segment;

[0086] (6) Determine BR zm ≤6 whether it holds true;

[0087] If yes, then no actual segmentation is performed on transition section a and transition section b, and the product structure is as follows Figure 2 As shown, the transition section a bamboo multiple BR za Set the same sub-segment as the feed roller speed S corresponding to transition segment a. dza Same as this sub-paragraph;

[0088] BR za <BR zm And the difference between the two is <4; S dj dza And the difference between the two is less than 48r / min, S dza <S​dzm And the difference between the two is less than 48r / min;

[0089] Let transition section b bamboo multiple BR zb =BR za , let the feed roller speed S corresponding to transition section b be dzb =S dza ;

[0090] If not, the transition section a and the transition section b are actually segmented into two equal sections, and the product structure of the transition section a2, the transition section b2, and the transition section a1 and the transition section b1 connected to the main section are obtained. Figure 1 As shown;

[0091] The transition section a2 bamboo multiple BR za2 Set the same sub-segment as the feed roller speed S corresponding to the transition segment a2. dza2 Same as this sub-section; change the transition section a1 bamboo multiple BR za1 Set the same sub-segment as the feed roller speed S corresponding to the transition segment a1. dza1 Same as this sub-paragraph;

[0092] BR za2 <BR za1 And the difference between the two is less than 4, BR za1 <BR zm And the difference between the two is <4; S dj dza2 And the difference between the two is less than 48r / min, S dza2 dza1 And the difference between the two is less than 48r / min, S dza1 dzm And the difference between the two is less than 48r / min;

[0093] Let the transition section b2 bamboo multiple BR zb2 =BR za2 , let the feed roller speed S corresponding to transition section b2 dzb2 =S dza2 ;

[0094] Let transition section b1 bamboo multiple BR zb1 =BR za1 , let the feed roller speed S corresponding to the transition section b1 dzb1 =S dza1 ;

[0095] (7) Spinning according to the above parameters can produce high-multiple bamboo yarn.

[0096] According to the above steps, the relevant variables in each embodiment are shown in Table 1:

[0097] ​​​Table 1 (Note: Raw material A is the fiber raw material fed from the left, and raw material B is the fiber raw material fed from the right)

[0098]

[0099]

[0100]

[0101] After spinning, the main section slub number of the slub yarn finally obtained is tested according to the following method:

[0102] Cut a 2cm base yarn segment and measure its weight. After 10 tests, take the average value to get the A value (g); cut a 2cm main body segment and measure its weight. After 10 tests, take the average value to get the B value (g). Then the main body segment bamboo node multiple = B value / A value;

[0103] The main segment slub multiples of the slub yarn finally obtained in each embodiment are shown in Table 2:

[0104] Table 2

[0105] Example 1 Example 2 Example 3 Example 4 Example 5 6.2 5.4 7.8 6.9 5.8

[0106] It can be seen from Table 1 and Table 2 that the main segment slub multiples of the slub yarn finally obtained in each embodiment are close to the corresponding set value BR zm , indicating that the method of the present invention can spin high-multiple (5 times and above) slub yarn. In actual production, the yarn can also have rich colors and 3D visual changes by changing the color, fiber type and feeding ratio of the fiber strips fed on both sides.

Claims

1. A method for spinning high-multiple slub yarn, characterized in that: The high-multiple slub yarn is composed of alternately arranged base yarn segments and slub segments. The slub segment is connected in sequence by a transition segment a, a main segment, and a transition segment b. The spinning adopts double-feed double-combing rotor spinning technology. The specific process is as follows: first, the fiber raw material, spinning parameters and equipment parameters are selected according to the spinning requirements; then, the length of the transition segment a, the length of the transition segment b, the feed roller speed corresponding to the base yarn segment, and the feed roller speed corresponding to the main segment are calculated; then, the transition segment a is virtually segmented, and the feed roller speed corresponding to each sub-segment is calculated. According to the slub multiple BR of the main segment, the feed roller speed corresponding to the base yarn segment is calculated. zm Determine whether to actually segment the transition section a, and determine the bamboo knot multiple of the transition section a and the corresponding feeding roller speed according to the virtual segmentation result, and set the parameters of the transition section b to be the same as the transition section a; finally, spin according to the above parameters to obtain high-multiple bamboo knot yarn; Main section bamboo multiples BR zm ≥5.

5.

2. A method for spinning high-multiple slub yarn according to claim 1, characterized in that: The specific steps are as follows: (1) Select the fiber raw material and set the left side feeding fiber strip quantity Q l , right side feeding fiber strip quantitative Q r , Base yarn segment linear density D j , base yarn length L j , bamboo segment length L z , main body length L zm , Main section bamboo multiples BR zm , the proportion of the fiber strip fed into the left side of the base yarn P lj , the proportion of fiber strips fed into the right side of the base yarn P rj , the proportion of fiber strips fed into the left side of the main section P lzm , the proportion of fiber strips fed into the right side of the main section P rzm , rotor speed n, left combing roller speed, right combing roller speed, left combing roller model, right combing roller model, rotor diameter, rotor negative pressure, twist coefficient α, feed roller radius R; L zm ≥0.06m; (2) Calculate the length L of the transition section a za , Transition section b length L zb , the formula is: L za =L zb =(L z -L zm ) / 2; Calculate the feed roller speed S corresponding to the base yarn section dj , d is l or r, S lj Represents the left feeding roller speed corresponding to the base yarn section, S rj Represents the right feeding roller speed corresponding to the base yarn section, S dj The calculation formula is as follows: S dj =v×D j ×P dj / (2π×R×Q d ); v = n / T; T=α / D j -1 / 2 ; In the formula, S dj The unit is r / min; n is r / min; D j The unit is tex; R is m; Q d The unit is g·5m -1 , d is l or r; P dj Where d is l or r; v is the yarn delivery speed, the unit is m / min; T is the yarn twist, the unit is twist / m; Calculate the feed roller speed S corresponding to the main section dzm , d is l or r, S lzm Represents the left feeding roller speed corresponding to the main section, S rzm Represents the right feeding roller speed corresponding to the main section, S dzm The calculation formula is as follows: S dzm =v×D zm ×P dzm / (2π×R×Q d ); v = n / T; T=α / D zm -1 / 2 ; D zm =D j ×BR zm ; In the formula, S dzm The unit is r / min; n is r / min; D j The unit is tex; R is m; Q d The unit is g·5m -1 , d is l or r; P dzm Where d is l or r; v is the yarn delivery speed, the unit is m / min; T is the yarn twist, the unit is twist / m; D zm is the linear density of the main segment, in tex; (3) Virtually segment the transition segment a to obtain f sub-segments arranged in sequence from the base yarn segment to the main segment. The bamboo node multiple of the first sub-segment is 1.5, and the bamboo node multiple of the fth sub-segment is BR zm -0.5, the difference between the bamboo node multiples of two adjacent sub-segments is 0.5, calculate the linear density D of the i-th sub-segment zai , i=1,2,…,f; (4) Calculate the feed roller speed S corresponding to the i-th sub-segment dzai , d is l or r, S lzai represents the left feeding roller speed corresponding to the i-th sub-segment, S rzai represents the speed of the right feeding roller corresponding to the i-th sub-segment, S dzai The calculation formula is as follows: S dzai =v×D zai ×P dzai / (2π×R×Q d ); v = n / T; T=α / D zai -1 / 2 ; P dzai =[(P dzm -P dj ) / ((BR zm -1)×2)×i+P dj ] / (1+0.5×i); In the formula, S dzai The unit is r / min; n is r / min; D zai The unit is tex; R is m; Q d The unit is g·5m -1 , d is l or r; P dzm Where d is l or r; P dj Where d is l or r; v is the yarn delivery speed, the unit is m / min; T is the yarn twist, the unit is twist / m; P dzai Where d is l or r, P lzai is the proportion of fiber strips fed into the left side of the i-th sub-segment, P rzai is the percentage of fiber strips fed into the right side of the i-th sub-segment; (5) Determine BR zm ≤6 whether it holds true; If yes, then the transition segments a and b are not actually segmented, and the bamboo multiples of transition segment a are BR za Set the same sub-segment as the feed roller speed S corresponding to transition segment a. dza Same as this sub-paragraph; BR za <BR zm And the difference between the two is <4; S dj dza And the difference between the two is less than 48r / min, S dza dzm And the difference between the two is less than 48r / min;​​ Let transition section b bamboo multiple BR zb =BR za , let the feed roller speed S corresponding to transition section b be dzb =S dza ; If not, the transition segment a and the transition segment b are actually segmented into two equal segments, so as to obtain transition segment a2, transition segment b2, and transition segment a1 and transition segment b1 connected to the main segment at the same time; The transition section a2 bamboo multiple BR za2 Set the same sub-segment as the feed roller speed S corresponding to the transition segment a2. dza2 Same as this sub-section; change the transition section a1 bamboo multiple BR za1 Set the same sub-segment as the feed roller speed S corresponding to the transition segment a1. dza1 Same as this sub-paragraph; BR za2 <BR za1 And the difference between the two is less than 4, BR za1 <BR zm And the difference between the two is <4; S dj dza2 And the difference between the two is less than 48r / min, S dza2 dza1 And the difference between the two is less than 48r / min, S dza1 dzm And the difference between the two is less than 48r / min;​​​ Let transition section b2 bamboo multiple BR zb2 =BR za2 , let the feed roller speed S corresponding to transition section b2 dzb2 =S dza2 ; Let transition section b1 bamboo multiple BR zb1 =BR za1 , let the feed roller speed S corresponding to the transition section b1 dzb1 =S dza1 ; (6) Spinning according to the above parameters can obtain high-multiple bamboo yarn.

3. A method for spinning high-multiple slub yarn according to claim 2, characterized in that: The average length of the fibers in the left-side fed fiber strip and the right-side fed fiber strip ranges from 18 to 76 mm, and the absolute value of the difference in the average length of the fibers in the left-side fed fiber strip and the right-side fed fiber strip does not exceed 39 mm.

4. A method for spinning high-multiple slub yarn according to claim 2, characterized in that: The average fineness of the fibers in the left-side feeding fiber strip and the right-side feeding fiber strip ranges from 1.38 to 1.8 dtex.

5. A method for spinning high-multiple slub yarn according to claim 2, characterized in that: Q l and Q r The value range is 18.2~23g·5m -1 The speed range of the left and right combing rollers is 6000~8500r·min -1 The range of the rotor negative pressure is -6000~-4200Pa.

6. A method for spinning high-multiple slub yarn according to claim 2, characterized in that: D j Not less than 40tex, the value range of α is 430-500.

7. A method for spinning high-multiple slub yarn according to claim 2, characterized in that: n <50000r / min。 8. A method for spinning high-multiple slub yarn according to claim 2, characterized in that: L j ≥0.2m, L z ≥0.14m, left and right combing rollers are OK61, R<0.06m.

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