CN111349998A

CN111349998A - MC blending rotor spinning process

Info

Publication number: CN111349998A
Application number: CN202010348030.7A
Authority: CN
Inventors: 李可培; 卢婷婷; 焦安峰; 李世磊; 殷承祥
Original assignee: Qingdao Jiaxi Home Textiles Co ltd
Current assignee: Qingdao Jiaxi Home Textiles Co ltd
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2020-06-30

Abstract

The invention discloses an MC blended rotor spinning process, which comprises the following steps: s1, selecting raw materials; s2, rolling cotton: opening and picking lap joint machine opens respectively Modal fibre and cotton fiber, edulcoration, mixed processing, makes even lap: s3, carding: feeding the obtained cotton rolls into a carding machine for carding, carding into strips and forming raw strips; s4, blending: drawing the raw slivers on a drawing frame for three times to form cooked slivers; s5, rotor spinning: and spinning the obtained drawn sliver on a rotor spinning machine to form the Modal/cotton fiber blended yarn. The rotor spinning process can directly use the cotton sliver for spinning, can directly wind the cotton sliver into cheese, saves two working procedures of roving and spooling, simplifies the working procedures, improves the production efficiency, saves the cost, has good adaptability to raw materials with large length difference and much impurities, is suitable for blending long, short, thick and thin fibers, has good impurity removing effect, has the advantage of high efficiency and can mix and utilize various fibers.

Description

MC blending rotor spinning process

Technical Field

The invention relates to the technical field of spinning, in particular to a rotary cup spinning process for MC (monomer casting) blending.

Background

The Modal fiber is a new high wet modulus viscose cellulose regenerated fiber developed by Austria lanjing company, the raw material of the product is beech in Europe, the beech is firstly made into wood pulp, and then the wood pulp is processed into the fiber through a special spinning process, so the Modal fiber is harmless to human bodies and environment, can be naturally decomposed, is known as green environment-friendly fiber, and has the advantages of moisture absorption, air permeability, high strength, good glossiness, soft hand feeling, good drapability, high color fastness and the like. The cotton fiber is used as a natural cellulose fiber and has the advantages of slender and soft property, good moisture absorption, strong alkali resistance and the like; but the elasticity and the elastic recovery are poor, the wear resistance is more general, and the strength is slightly inferior to that of other synthetic fibers.

The modal fiber and cotton fiber blended spinning not only can make up the defects of wear resistance, strength and the like of the cotton fiber, but also can improve the defect of poor stiffness of a pure modal product, thereby improving the appearance of the fabric and keeping the fabric soft and smooth, so that the modal fiber and cotton fiber blended spinning is a brand-new high-grade garment fabric and has wide market development prospect.

At present, the manufacturing method of the blended yarn mainly comprises ring spinning, friction spinning and the like. However, the traditional ring spinning method has the problems of low speed, small package, insufficient fluffiness of the finished yarn, uneven yarn levelness and the like.

The friction spinning method has the following problems: the arrangement of fibers in the friction yarn is irregular, the number of folded, looped and hooked fibers is more, the number of the fibers is far more than that of rotor spinning, and the number of the fibers is more than that of ring spinning; the fibers arranged according to conical and cylindrical spiral lines in the friction yarn only account for 3% -4%, other fibers with defects or irregular arrangement account for about 96%, and the defects of the fiber arrangement form inevitably influence the strength of the friction yarn.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides an MC blended rotor spinning process.

The invention is realized by the following technical scheme:

an MC blended rotor spinning process comprises the following steps:

s1, selecting the following raw materials: according to the proportion of the formula: the Modal/cotton blended yarn comprises the following components in percentage by weight: 55-85% of Modal fiber and 15-45% of cotton fiber; the fineness of the Modal fiber and the cotton fiber is as follows: 2.2 dtex-3.2 dtex;

s2, rolling cotton: opening and picking cotton into rolls by a combined opening and picking roll machine, respectively opening, removing impurities and mixing the Modal fibers and the cotton fibers to prepare uniform cotton rolls;

s3, carding: feeding the obtained cotton rolls into a carding machine for carding, carding into strips and forming raw strips;

s4, blending: carrying out secondary drawing on the obtained raw slivers on a drawing frame to form cooked slivers;

s5, rotor spinning: spinning the obtained drawn sliver on a rotor spinning machine to form Modal/cotton fiber blended yarn; wherein, the parameter control of the rotor spinning:

twist degree: 360-450T/m;

the speed of the rotating cup: 20000-45000 r/min;

carding roller speed: 5500 to 7500 r/min.

Preferably, in step S1, the Modal/cotton blended yarn is composed of the following components in percentage by weight: 65-75% of Modal fibers and 25-35% of cotton fibers.

Preferably, in step S1, the fineness of the Modal fiber and the cotton fiber is: 2.6 dtex-3.0 dtex.

Preferably, in step S4, two drawing passes are used: the head combination principle is mixing, and the second combination principle is drafting;

selecting an HISD961 high-speed drawing frame; the roller gauge is 10X9X18mm, the total draft multiple is 5.8-6.09, and the sliver discharging speed is 120-200 m/min;

secondly, a high-speed drawing frame of the Telitsexle TD03 is adopted, the roller gauge adopts 43X51mm, the input number is 3.0-3.6 ktex, and the dry weight of the cotton sliver is 2-3.03 g/m.

The invention also aims to provide a Modal/cotton fiber blended yarn, which is obtained by the rotor spinning preparation process of the MC blended yarn.

Preferably, the linear density of the Modal/cotton fiber blended yarn is 25-35 tex.

The invention also aims to provide application of the Modal/cotton fiber blended yarn, and the Modal/cotton fiber blended yarn is applied to yarns for producing underwear.

Compared with the prior art, the invention has the following beneficial effects:

the invention adopts the rotor spinning process to process Modal/cotton fiber blended yarn, adopts sliver feeding, can be directly wound into cheese, and omits two procedures of roving and spooling, thereby simplifying the process flow, improving the production efficiency, saving the cost, simultaneously effectively complementing the advantages and disadvantages of Modal fiber and cotton fiber, and leading the resultant yarn to have even evenness, smooth surface, less impurity formation and less yarn defects.

(2) The rotor spinning process has good adaptability to raw materials with large length difference and containing much impurities, is suitable for blending of long, short, thick and thin fibers, has good impurity removing effect and the advantage of high-efficiency blending, can mix and utilize various fibers, and can be used for spinning Modal/cotton blended yarns with the rotor spinning process to obtain the Modal/cotton blended yarns with the optimal comprehensive performance when weaving three-dimensional fabrics and is suitable for producing underwear.

Drawings

FIG. 1 is a graph of breaking strength versus twist multiplier;

FIG. 2 is a graph showing the relationship between breaking strength and the rotating speed of the carding roller;

FIG. 3 is a graph of breaking force versus rotor speed.

Detailed Description

The present invention will be further illustrated with reference to the following specific examples.

The invention provides an MC blended rotor spinning process, which comprises the following steps:

s2, rolling cotton: the opening and picking lap combination machine opens, removes impurities and mixes the Modal fiber and the cotton fiber respectively to process the Modal fiber and the cotton fiber into uniform lap for a carding machine to use:

s4: mixing: carrying out three-pass drawing on the obtained raw slivers on a drawing frame to form cooked slivers;

s5: rotor spinning: spinning the obtained drawn sliver on a rotor spinning machine to form Modal/cotton fiber blended yarn; wherein, the parameter control of the rotor spinning:

twist degree: 360-450T/m;

the speed of the rotating cup: 20000-45000 r/min;

carding roller speed: 5500 to 7500 r/min.

In the following examples, the test raw materials selected were Modal fibers and cotton fibers, and the drawn sliver used was prepared at a blend ratio of 70/30 and had a dry weight of 11.85g/5 m. The test equipment was a rotor spinning machine model FA601A for spinning Modal/cotton yarn blends with a linear density of 28 tex. The testing instruments were model YG061F electronic single yarn strength tester and CT200 yarn evenness tester.

(1) The inventor firstly discusses the value ranges of the twist coefficient, the rotating speed of the carding roller and the rotating speed of the rotating cup on different types of carding rollers through a single factor test method, compares and analyzes the influence of each process parameter on the quality of finished yarn, and determines the value of the optimal twist coefficient and three proper values of the rotating speed of the carding roller and the rotating speed of the rotating cup.

Firstly, keeping the quantitative evenness and the tension drafting multiple of the technological parameters unchanged, wherein the quantitative evenness is 11.85g/5m, and the tension drafting multiple is 1.01 times. The variation range of the twist coefficient is positioned between 360 and 450, the variation range of the rotating speed of the carding roller is positioned between 5500 and 7500r/min, and the variation range of the rotating speed of the rotor is positioned between 20000 and 45000 r/min. The invention provides three types of carding rollers, namely a sawtooth roller 78 degrees, a sawtooth roller 92 degrees and a needle roller, wherein the type of the carding roller adopted in the following single-factor test is the sawtooth roller 78 degrees.

In the rotor spinning process of the present invention, the selection of the twist multiplier is important, which determines the yarn structure and quality. To this end, examples 1 to 10 were designed, and the value of the optimum twist multiplier was determined by measuring the relationship between the twist multiplier and the breaking strength of the yarn while changing the twist multiplier under other conditions. Wherein, the rotating speed of the carding roller is 6500r/min, and the rotating speed of the rotor is 25000 r/min. The breaking strength of the yarn at different twist multiplier measured by YG061F electric single yarn strength tester is shown in Table 1 and FIG. 1.

TABLE 1

Referring to the results in table 1 and fig. 1, it is understood that, in the twist factor range of 360 to 450, the resultant yarn breaking strength increases first and decreases gradually after reaching the peak value as the twist factor increases. This is because, when the twist factor is small, the fiber curl is small, the friction between fibers is small, and the cohesion is poor. As the twist factor increases, the frictional resistance between fibers increases, the possibility of yarn breakage due to slippage between fibers decreases, and the twisting reduces unevenness in the yarn strength in the longitudinal direction, thereby increasing the resultant yarn breaking strength. However, when the twist coefficient is too high and exceeds the critical twist coefficient value of 380, the twisting action is mainly shown as increasing the prestress of the fibers in the yarn, reducing the axial component force of the fiber strength and reducing the breaking strength.

(II) the carding roller plays a main role in rotor spinning in carding fibers, improving the fiber separation degree and removing impurities, and the rotating speed of the carding roller has obvious influence on the quality of finished yarns. Therefore, the invention designs the embodiments 11 to 15, the rotating speed of the carding roller is changed, the relation between the rotating speed of the carding roller and the breaking strength of the yarn is measured, and the optimal rotating speed value of the carding roller is found out, and other conditions are kept unchanged. And combining the test result of the previous step, taking the twist coefficient as 380 and the rotating speed of the rotor as 25000 r/min. The yarn breaking strength at different carding roller rotation speeds measured by a model YG061F electronic single yarn strength tester is shown in Table 2 and FIG. 2.

TABLE 2

	Example 11	Example 12	Example 13	Example 14	Example 15
						Combing roller speed (r/min)	5500	6000	6500	7000	7500
Breaking strength (cN)	326	333	359	351	346

Referring to the results in table 2 and fig. 2, it can be seen that the yarn breaking strength increases and then decreases with the increase of the rotation speed of the carding roll when the rotation speed of the carding roll is 5500 to 7500r/min, and the yarn breaking strength reaches a peak value when the rotation speed of the carding roll is 6500 r/min. The carding effect is enhanced due to the increase of the rotating speed of the carding roller, the fiber separation degree is good, the single fiber percentage is large, and the single yarn strength is gradually increased. But the rotating speed of the carding roller is continuously increased after exceeding a certain critical value, the average length of the fiber after being carded is reduced, the short fiber rate is increased, and the fiber is continuously damaged. In addition, the rotating speed of the carding roller has a remarkable influence on the airflow speed of the conveying pipe and is related to the negative pressure of the rotating cup. When the speed of the rotor is low, the negative pressure is low, the rotating speed of the carding roller is higher, the air flow speed at the outlet of the conveying pipe is lower, the fiber performs deceleration movement, the fiber is bonded, the fiber bundle is increased, and the strength of the single yarn is reduced.

(III) the rotor speed directly influences the quality and yield of the rotor yarn in the rotor spinning process. Therefore, the invention designs the embodiments 16-21, keeps other conditions unchanged, changes the revolving cup rotating speed, measures the relation between the revolving cup rotating speed and the yarn breaking strength, finds the best revolving cup rotating speed, combines the test result, and takes the twist coefficient as 380 and the carding roller rotating speed as 6500 r/min. The breaking strength of the yarn at various rotor speeds, as measured by an electronic single yarn strength meter model YG061F, is shown in Table 3 and FIG. 3.

TABLE 3

	Example 16	Example 17	Example 18	Example 19	Example 20	Example 21
							Revolving cup speed (r/min)	20000	25000	30000	35000	40000	45000
Breaking strength (cN)	338	350	379	364	349	338

Referring to the results in Table 3 and FIG. 3, it can be seen that the yarn breaking strength increases and then decreases with the increase of the rotor rotation speed when the rotor rotation speed is 20000 to 45000r/min, and the breaking strength reaches the peak value when the rotor rotation speed is 30000 r/min. The vacuum degree of the rotor can be improved by increasing the rotating speed of the rotor, so that the fibers are further oriented and straightened in the process from the conveying pipe to the coagulation tank of the rotor, and the breaking strength of the resultant yarn is improved. However, when the rotating speed of the rotor is too high, the sliver feeding speed is increased, the carding effect is weakened, the fiber bundle number is increased, the fiber separation degree and the orientation degree are deteriorated, and the resultant yarn strength begins to gradually decrease.

The method is adopted to carry out single factor test on the twist coefficient, the rotating speed of the carding roller and the rotating speed of the revolving cup under the conditions of the sawtooth roller and the needle roller with the angles of 92 degrees. According to the single-factor test result, when the type of the carding roller is 92 degrees, the twist coefficient is 380, the rotating speed of the carding roller is 6000r/min, and the rotating speed of the rotor is 30000r/min, so that the breaking strength of the yarns reaches the peak value respectively; and when the carding roller is a needle roller, the twist coefficient is 420, the rotating speed of the carding roller is 6000r/min, and the rotating speed of the rotor is 30000r/min, so that the breaking strength of the yarns reaches a peak value respectively.

The test results show that the twist coefficient, the rotating speed of the carding roller and the rotating speed of the rotor are three important parameters influencing the structure and the quality of the rotor yarn, and the single factor test shows that the high-quality yarn can be spun only by reasonably selecting the process parameters when the Modal/cotton blended rotor yarn is processed.

(2) The inventor finds the optimal process parameter configuration through three-level orthogonal test design of three factors (the type of the carding roller, the rotating speed of the carding roller and the rotating speed of the rotor), so that the performance of the spun Modal/cotton fiber blended rotor yarn is optimal.

Combining the single-factor test results of the three types of carding rollers, the inventor fixes the value of the twist coefficient to be 380, and then carries out L with three factors and three levels₂₇(3¹³) And (4) orthogonal experimental design. The encoding levels are shown in table 4, the header design is shown in table 5, and the orthogonality tests are shown in table 6.

TABLE 4L₂₇(3¹³) A coding level table.

TABLE 5L₂₇(3¹³) Watch head design

TABLE 6L₂₇(3¹³) Orthogonal test table

Modal/cotton blended yarns were spun according to the designed orthogonal test protocol and the yarn properties were measured and the results are shown in Table 7.

TABLE 7

The invention adopts an orthogonal table range analysis method (an intuitive analysis method) and an variance analysis method (a variation analysis method) to carry out statistics and analysis on the range and the variance of the yarn breaking strength measured by the test, and respectively obtains a breaking strength visual analysis table (shown in a table 8) and a breaking strength variance analysis table (shown in a table 9).

TABLE 8

TABLE 9

From the results of tables 8 and 9, it can be seen that the factor a, i.e., the type of the opening roller, has the most significant effect on the yarn breaking strength, and that the yarn breaking strength is relatively good when the type of the opening roller is horizontal 2, i.e., the serrated roller is at 92 °. The factor C, namely the rotating speed of the carding roller, has larger influence on the breaking strength of the yarn than the factor B, namely the rotating speed of the rotor, and the optimal spinning process is A₂B₁C₁。

Then, the extreme differences and variances of the yarn elongation measured in the test were counted and analyzed to obtain an elongation visual analysis table (see table 10) and an elongation variance analysis table (see table 11), respectively.

Watch 10

TABLE 11

As can be seen from tables 10 and 11, the primary and secondary sequences of the factors affecting the yarn elongation are A>C>B, the influence of the type of the combing roller on the elongation of the yarn is most obvious, and the optimal spinning process is A₂B₃C₁。

Then, the extreme differences and variances of the work of breaking of the yarn measured in the test are counted and analyzed, and a visual analysis table (see table 12) and a table 13 of the work of breaking are respectively obtained.

TABLE 12

Watch 13

As can be seen from tables 12 and 13, the primary and secondary sequences of the factors affecting the work of breaking yarn are A>C>B, the type of the combing roller has the most obvious influence on the breaking work of the yarn, and the optimal spinning process is A₂B₂C₃And A₂B₃C₁。

Then, the extreme difference and variance of the yarn hairiness index measured by the test are counted and analyzed, and a hairiness index visual analysis table (see table 14) and a hairiness index variance analysis table (see table 15) are respectively obtained.

TABLE 14 visual hair feather index analysis table

TABLE 15 hairiness index ANOVA TABLE

As can be seen from tables 14 and 15, the primary and secondary sequences of the factors affecting the yarn hairiness index are A>B>C, the type of the combing roller has the most obvious influence on the yarn hairiness index, and the optimal spinning process is A₂B₁C₂。

Then, the extreme difference and variance of the yarn evenness measured in the test are counted and analyzed to obtain a visual analysis table of the yarn evenness (see table 16) and an analysis table of the yarn evenness variance (see table 17), respectively.

TABLE 16 visual analysis chart of evenness

TABLE 17 analysis of variance of evenness

As is clear from the results in tables 16 and 17, the primary and secondary sequences of the factors affecting the yarn evenness unevenness are A>B>C, the influence of the type of the carding roller and the rotating speed of the rotating cup on the yarn evenness is obvious, and the optimal spinning process is A₂B₂C₃。

Then, the extreme differences and variances of the yarn details measured in the test are counted and analyzed, and a detail visual analysis table (see table 18) and a detail variance analysis table (see table 19) are respectively obtained.

Table 18 detail visual analysis table

Table 19 details analysis of variance table

From the results in tables 18 and 19, the primary and secondary order of the factors affecting the yarn details is C>A>B, wherein the influence of the rotating speed of the combing roller and the interaction of the rotating speed of the combing roller and the rotating cup on the yarn details is more obvious, and the optimal spinning process is A₂B₂C₃。

Then, the extreme differences and variances of the yarn slubs measured in the test are counted and analyzed, and a slub visual analysis table (see table 20) and a slub variance analysis table (see table 21) are respectively obtained.

Watch 20 bold visual analysis meter

TABLE 21 bold ANOVA TABLE

As can be seen from tables 20 and 21, the primary and secondary sequences of the factors affecting the yarn slub are A>B>C, wherein the carding roller type, the revolving cup rotating speed and the interaction of the carding roller type and the revolving cup rotating speed have obvious influence on the yarn slubby, and the optimal spinning process is A₂B₁C₃。

Then, the extreme difference and variance of the yarn neps measured in the test are counted and analyzed to obtain a nep visual analysis table (see table 22) and a nep variance analysis table (see table 23), respectively.

TABLE 22 visual analysis table for neps

TABLE 23 analysis of variance of neps

As can be seen from tables 22 and 23, the primary and secondary sequences of the factors affecting the neps of the yarn are A>B>C, the carding roller type number and the interaction of the carding roller type number and the rotating speed of the rotor have obvious influence on yarn neps, and the optimal spinning process is A₂B₁C₃。

Then, analysis was performed by the weighted Borda number method. According to the importance degree of various indexes of yarn performance to the yarn quality and the underwear fabric to be woven subsequently, different weight coefficients are respectively given to the yarn quality and the underwear fabric, wherein the breaking strength and the evenness rate respectively account for 20 percent, the elongation and the breaking work respectively account for 16 percent, the hairiness index, the detail, the nubs and the neps respectively account for 7 percent, and the statistical result is shown in the following table 24:

table 24 weighted Borda number statistical table

From the results of Table 24It is known that the weighted Borda number is highest for the run 15, i.e. the optimum spinning process is A₂B₂C₃That is to say, when the type of the carding roller adopts a sawtooth roller of 92 degrees, the rotating speed of the rotor is 30000r/min, and the rotating speed of the carding roller is 6500r/min, the yarn quality of the spun Modal/cotton blended rotor yarn is the highest.

The Modal/cotton blended rotor yarn (linear density of 28tex) spun by the optimal scheme (number 15) is used for product development on a flat knitting machine, the influence of different knitted fabric tissues on fabric wearability is analyzed, and the knitted fabric tissue which is most suitable for producing underwear is discussed. (Note: this example uses two yarns in combination for trial weaving because the spun yarn is thin and the number of the flat knitting machine used for trial weaving is relatively small.)

The invention selects four knitted fabric textures to carry out sample test weaving, which are respectively a 1+1 rib, a 1+1 rib semi-air layer, a four-flat (also called a full-needle rib and a no-needle) and a three-flat (commonly called a half-rotation cylinder half-rotation flat, also called a full-needle rib semi-air layer). The fabric texture suitable for underwear production was studied, and five fabric wearability tests were performed herein, respectively, air permeability, drape, abrasion resistance, burst, and low stress elongation.

The YG (B)461E type digital fabric air permeability tester is selected to test the air permeability of the fabric, and the test area is 20cm²The differential pressure of the administered samples was 100Pa, and the test results are shown in Table 25.

TABLE 25 air Permeability of different Fabric weaves

The air permeability of the fabric has important significance for garment materials, particularly underwear materials, and the higher the air permeability is, the better the air permeability of the fabric is. Therefore, from the results of Table 25, it is clear that the 1+1 rib semi-air layer fabric has the highest air permeability and the best air permeability, and the tri-flat fabric has the lowest air permeability and the relatively poor air permeability.

The fabric drapability was tested using a model YG811L dynamic fabric drapability stylizer, and 240mm diameter circles were cut out from the test specimens, the test results are shown in Table 26.

TABLE 26 dynamic drape coefficients for different weaves

The drapability of the fabric is an important factor for determining the visual aesthetic feeling of the fabric, and the larger the drapability coefficient is, the poorer the drapability of the fabric is. Therefore, from the results in Table 26, it is clear that the dynamic drape coefficient of the four-plane fabric is the smallest and the drape is the best, while the dynamic drape coefficient of the 1+1 rib semi-air layer fabric is the largest and the drape is the worst.

The YG (B)522 fabric abrasion resistance tester was used to test the abrasion resistance of the fabric, the number of rubs was set to 80, the test piece was cut into a circle with a diameter of 116mm, and the test results are shown in Table 27.

TABLE 27 abrasion resistance of different weave patterns

The abrasion resistance of a fabric refers to the ability of the fabric to resist abrasion from rubbing against another object. It is clear that the more mass loss before and after rubbing, the worse the wear resistance of the fabric. Therefore, it can be seen from the results of Table 27 that the abrasion resistance is the worst when the percentage mass loss of the three-dimensional woven fabric is the smallest, and the abrasion resistance is the worst when the percentage mass loss of the 1+1 rib woven fabric is the largest.

The YG (B)031PC type desk electronic fabric bursting strength machine is used to test the bursting property of the fabric, the sample is cut into a circle with the diameter of 81mm, and the test results are shown in Table 28.

TABLE 28 burst Strength of different Fabric weaves

The bursting strength directly reflects the durability index of the knitted fabric when the knitted fabric deforms and breaks under the action of external force. As can be seen from the results in table 28, the tri-flat fabric has the highest burst strength, i.e., the best burst performance, while the 1+1 rib fabric has the lowest burst strength, which is relatively poor.

The fabric was tested for low stress body length using a CSIRO-FAST style machine with a compression load of 5cN/cm and a 50mm × 130mm rectangle cut from the test specimen and the test results are shown in Table 29.

TABLE 29 Low stress elongation of different Fabric weaves

The tensile properties of the fabric under low stress reflect the deformation characteristics of the fabric under normal stresses during production, sewing and use. The lower the low stress elongation, i.e. the lower the amount of tensile set, the better the tensile elasticity of the fabric. Therefore, it can be seen from the results in Table 29 that the tri-flat fabric has the lowest low stress elongation and the best tensile elasticity, while the 1+1 rib fabric has the highest low stress elongation and the relatively poor tensile elasticity.

Then, the wearability of the fabrics with different tissues is comprehensively analyzed by the Borda number method, and the statistical results are shown in the table 30.

Table 30 Borda number statistical table

From the results in Table 30 above, it can be seen that the Borda number of the tri-plane fabric is the highest, i.e., the Modal/cotton blended yarn spun by rotor spinning has the best combination of properties when it is woven into a tri-plane fabric, and is suitable for use in the production of underwear.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The MC blended rotor spinning process is characterized by comprising the following steps of:

s2, rolling cotton: opening and picking lap joint machine opens respectively Modal fibre and cotton fiber, edulcoration, mixed processing, makes even lap:

s4, blending: carrying out three-pass drawing on the obtained raw slivers on a drawing frame to form cooked slivers;

twist degree: 360-450T/m;

the speed of the rotating cup: 20000-45000 r/min;

carding roller speed: 5500 to 7500 r/min.

2. The MC blend rotor spinning process of claim 1, wherein in step S1, the Modal/cotton blend yarn is composed of the following components in percentage by weight: 65-75% of Modal fibers and 25-35% of cotton fibers.

3. The MC blending rotor spinning process according to claim 1, wherein in the step S1, the fineness of the Modal fibers and the cotton fibers is as follows: 2.6 dtex-3.0 dtex.

4. The MC blending rotor spinning process according to claim 1, wherein in step S4, two drawing passes are adopted: the head combination principle is mixing, and the second combination principle is drafting;

secondly, a high-speed drawing frame of the Telitsexle TD03 is adopted, the roller gauge adopts 43X51mm, the input number is 3.5-3.6 ktex, and the dry weight of the cotton sliver is 2-3.03 g/m.

5. A Modal/cotton fiber blended yarn, characterized in that the Modal/cotton fiber blended yarn is prepared by the MC blended rotor spinning process of any one of claims 1-4.

6. The Modal/cotton fiber blended yarn according to claim 6, wherein the Modal/cotton fiber blended yarn has a linear density of 25 to 35 tex.

7. The application of the Modal/cotton fiber blended yarn is characterized in that the Modal/cotton fiber blended yarn is applied to yarn for producing underwear.