CN110144661B - Flax and viscose blended fabric and processing technology thereof - Google Patents
Flax and viscose blended fabric and processing technology thereof Download PDFInfo
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- CN110144661B CN110144661B CN201910383923.2A CN201910383923A CN110144661B CN 110144661 B CN110144661 B CN 110144661B CN 201910383923 A CN201910383923 A CN 201910383923A CN 110144661 B CN110144661 B CN 110144661B
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
- D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
- D01H5/32—Regulating or varying draft
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
- D02G3/04—Blended or other yarns or threads containing components made from different materials
- D02G3/042—Blended or other yarns or threads containing components made from different materials all components being made from natural material
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/34—Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
- D03D13/008—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft characterised by weave density or surface weight
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
- D03D15/47—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads multicomponent, e.g. blended yarns or threads
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
- D10B2201/01—Natural vegetable fibres
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
- D10B2201/20—Cellulose-derived artificial fibres
- D10B2201/22—Cellulose-derived artificial fibres made from cellulose solutions
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
- D10B2201/20—Cellulose-derived artificial fibres
- D10B2201/22—Cellulose-derived artificial fibres made from cellulose solutions
- D10B2201/24—Viscose
Abstract
The invention relates to a flax and viscose blended fabric and a processing technology thereof, wherein the flax and viscose blended fabric is woven by warps and wefts in a plain weave mode, and is characterized in that: the warp yarn is viscose fiber with 14.8 to 9.8tex, the weft yarn comprises a weft yarn A and a weft yarn B, the weft yarn A is yarn made of 14.8 to 9.8tex hemp regenerated cellulose Jutecell fiber through self-made hemp imitation equipment and technology, and has the quality and style characteristics of hemp yarn; the weft yarn B is blended yarn of 36 tex-19.5 tex formed by blending flax fibers and viscose fibers. The invention has the advantages that: selecting bast fiber regenerated cellulose fiber as a raw material, wherein the fiber has a hollow section shape similar to bast fiber, and is moisture-absorbing and quick-drying; the excellent antibacterial property of the fibrilia is kept, and the antibacterial rate to escherichia coli and staphylococcus aureus is more than 90%; the yarn with the quality style of the Jutecell fiber linen-imitating yarn, which is prepared by self-made linen-imitating equipment and process, has the function of linen fiber and the style of yarn evenness of linen yarn.
Description
Technical Field
The invention relates to the technical field of textile fabrics, in particular to a flax and viscose blended fabric and a processing technology thereof.
Background
The fibrilia is one of the important natural textile fibers in China, and has the advantages that other fibers are difficult to compare: the fiber has the advantages of good functions of moisture absorption, moisture dispersion and ventilation, fast heat transfer, coolness, stiffness, no close contact with sweat, light weight, strong strength, insect prevention, mildew prevention, less static electricity, difficult pollution of fabrics, soft and elegant color tone, roughness, suitability for excretion and secretion of human skin and the like, but also has some defects, such as poor elasticity, poor wrinkle resistance, poor wear resistance, itching feeling and the like.
In order to enable consumers to enjoy the fibrilia style and the products with excellent quality of the fibrilia more and better, the invention develops the flax and viscose blended fabric which is interwoven by taking viscose yarn as warp and taking flax and viscose blended yarn and the yarns with the quality style of linen fiber linen-like yarn as weft, and also provides a processing technology of the flax and viscose blended fabric.
Disclosure of Invention
The invention aims to provide a flax and viscose blended fabric which is interwoven by taking viscose yarn as warp yarn and taking flax and viscose blended yarn and yarn with the quality style of linen fiber linen-like yarn as weft yarn, and also provides a processing technology of the flax and viscose blended fabric.
In order to solve the technical problems, the technical scheme of the invention is as follows: the flax and viscose blended fabric is woven by warps and wefts in a plain weave mode, and is characterized in that:
the warp yarn is viscose fiber with 14.8 tex-9.8 tex, the weft yarn comprises weft yarn A and weft yarn B,
the weft yarn A is yarn made of 14.8-9.8 tex hemp regenerated cellulose Jutecell fibers by self-made hemp-imitating equipment and process, and has the quality and style characteristics of hemp yarn;
the weft B is a blended yarn of 36tex to 19.5tex formed by blending flax fibers and viscose fibers, and the blending ratio of the flax fibers to the viscose fibers in the weft B is 55: 45;
and the weft yarn A and the weft yarn B are arranged at intervals of 1:1 in sequence;
the flax and viscose blended fabric has the width of 150-180 cm, the warp density of 350-400 pieces/10 cm and the weft density of 250-300 pieces/10 cm.
The processing technology of the flax and viscose blended fabric has the innovation points that: the processing technology comprises the following steps:
step a, preparation of weft yarn A: selecting 1.33dtex multiplied by 38mm and 1.33dtex multiplied by 10-1.33 dtex multiplied by 16mm of Jutecell fibers, and spinning into roving through blowing, cotton carding, drawing and roving processes; the linen yarn imitating device of the spinning machine is manufactured by self, a front roller and a middle and rear roller transmission system of the spinning machine are separated, and a front roller independent servo transmission and servo control device is additionally arranged to spin yarns imitating the quality and style of the linen yarns;
step B, preparation of weft yarn B: blending flax fibers and viscose fibers according to the ratio of 55: 45; spooling for later use;
step c, selecting 1.33dex multiplied by 38mm of viscose fiber, and spinning 14.8 tex-9.8 tex warp yarns by a common conventional method; spooling for later use;
step d, a warping process, namely warping the yarns wound in the step c in batches by adopting a warping machine;
step e, weaving procedure: weaving by using an air jet loom, wherein the weft yarns A and B are woven in a ratio of 1: 1;
step f, post-finishing: and e, folding, inspecting, repairing, packaging and warehousing the fabric woven in the step e.
The processing technology of the flax and viscose blended fabric has the innovation points that: in the step a, when spinning yarns imitating the quality and style of the ramie yarns, a self-made ramie yarn spinning device is used for spinning the ramie yarns, a front roller of the spinning machine is separated from a middle and rear roller transmission system, the speed of the front roller is controlled by an independent servo transmission and servo control device to carry out intermittent speed change: the front roller performs speed reduction and speed increase after each interval period, the speed reduction is 10-20% within 0.2-0.4 s, and the speed increase is performed to the original speed within 0.2-0.4 s after the speed reduction meets the set requirement; the interval period is 3-8 s, and adjacent interval periods are randomly generated.
The invention has the advantages that:
selecting bast fiber regenerated cellulose fiber as a raw material, wherein the fiber has a hollow section shape similar to bast fiber, and is moisture-absorbing and quick-drying; the excellent antibacterial property of the fibrilia is kept, and the antibacterial rate to escherichia coli and staphylococcus aureus is more than 90%; the yarn with the quality style of the Jutecell fiber linen-imitating yarn, which is prepared by self-made linen-imitating equipment and process, has the function of linen fiber and the style of yarn evenness;
the flax fiber and the viscose fiber are blended into the weft yarn B according to the ratio of 55:45 to be woven into the weft yarn at intervals of 1:1 with the linen yarn-like yarn, the viscose fiber yarn is used as warp yarn, and 1/2 of the weft yarn is linen yarn-like yarn spun by linen regenerated Jutecell fiber, so that the fabric of the flax fiber-like yarn integrates the roughness of linen and the softness of regenerated cellulose, the problem of poor comfort of the linen is fully improved, and the flax fiber-like yarn has the functions of moisture absorption, moisture dispersion, air permeability, coolness, comfort, stiffness, heat transfer, heat conduction, suitability for excretion and secretion of human skin, non-fit perspiration, bacteriostasis and the like; meanwhile, regenerated hemp fibers and viscose fibers have good dyeing property, bright dyeing color and luster, are not easy to fade, and integrate various advantages, thereby showing the comfort and elegant fashion of hemp.
In addition, a self-made ramie-imitation device of the spinning frame is adopted, a front roller and a middle and rear roller transmission system of the spinning frame are separated, the speed change of the front roller in the spinning process is controlled by a front roller independent servo transmission and servo control device, and the ramie-regenerated cellulose fiber can be used as a raw material to spin ramie-imitation quality and style yarns.
Detailed Description
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
The flax and viscose blended fabric is formed by weaving warps and wefts in a plain weave mode, wherein the warps are viscose fibers of 14.8 to 9.8tex, the wefts comprise wefts A and wefts B, and the wefts A are yarns prepared from 14.8 to 9.8tex regenerated cellulose Jutecell fibers through self-made linen imitation equipment and a self-made linen imitation process, and have linen yarn quality and style characteristics; the fiber has a hollow section shape similar to fibrilia, and can absorb moisture and dry quickly; the excellent antibacterial property of the fibrilia is kept, and the antibacterial rate to escherichia coli and staphylococcus aureus is more than 90%; the weft B is a blended yarn of 36tex to 19.5tex formed by blending flax fibers and viscose fibers, and the blending ratio of the flax fibers to the viscose fibers in the weft B is 55: 45; and the weft yarn A and the weft yarn B are arranged at intervals of 1:1 in sequence; the flax and viscose blended fabric has the width of 150-180 cm, the warp density of 350-400 pieces/10 cm and the weft density of 250-300 pieces/10 cm.
The processing technology of the linen viscose blended fabric comprises the following steps:
step a, preparation of weft yarn A: selecting 1.33dtex multiplied by 38mm of regenerated cellulose fibrilia of bast fibers, and 1.33dtex multiplied by (10-16 mm) to be prepared according to the proportion of 1.33dtex multiplied by 38mm 80% and 1.33dtex multiplied by (10-16 mm) 20%, and spinning into roving through the working procedures of blowing, carding, drawing (first two combined) and roving;
step B, preparation of weft yarn B: blending flax fibers and viscose fibers according to the mass ratio of 55: 45; spinning into roving through blowing, cotton carding, drawing (first doubling) and roving processes, and spooling for later use;
important emphasis is given to: the preparation of weft yarn B needs to make a self-made linen-like yarn device of a spinning frame, a front roller of the spinning frame is separated from a middle and rear roller transmission system, a front roller independent servo transmission and servo control device is additionally arranged, and the speed of the front roller is controlled by the independent servo transmission and servo control device to carry out intermittent speed change: the front roller performs speed reduction and speed increase after each interval period, the speed reduction is 10-20% within 0.2-0.4 s, and the speed increase is performed to the original speed within 0.2-0.4 s after the speed reduction meets the set requirement; the interval period is 3-8 s, and adjacent interval periods are randomly generated. Spinning yarns imitating the quality style of the ramie yarns;
step c, selecting 1.33dex multiplied by 38mm of viscose fiber, and spinning 14.8 tex-9.8 tex warp yarns by a common conventional method; spooling for later use;
step d, a warping process, namely warping the yarns wound in the step c in batches by adopting a warping machine;
step e, weaving procedure: weaving by using an air jet loom, wherein the weft yarns A and B are woven in a ratio of 1: 1;
step f, post-finishing: and e, folding, inspecting, repairing, packaging and warehousing the fabric woven in the step e.
And (6) packaging.
Example of weft yarn a preparation:
1. procedure for cleaning cotton
Selecting 1.33dtex multiplied by 38mm of Jutecell fibers, and configuring the 1.33dtex multiplied by 12mm fibers according to the proportion of 1.33dtex multiplied by 38mm 80% and 1.33dtex multiplied by 12mm 20%, wherein the process principle is as follows: the cotton box is low in speed, combed instead of beaten and softly combed, the beater speed is reduced, the beating force is reduced, excessive fiber damage is avoided, and the cotton storage height of the cotton box is reduced to 1/2; prevent the excessive rolling of the fiber in the cotton box, reduce the speed of the cotton roll roller, increase the pressure of the cotton roll and prevent the cotton roll from sticking, and improve the quality of the cotton roll.
The main processes of opening picking are shown in table 1.
TABLE 1 main technological parameters for opening picking
2. Carding process
The technical measures are adopted, the distance between the cotton feeding plate and the licker-in is increased, the distance between the cylinder and the cover plate is properly enlarged, the damage to fibers is reduced, and the CV% value of neps and evenness is reduced; properly improving the speed ratio of the cylinder and the licker-in to accelerate fiber transfer; the card clothing specification is reasonably matched, the card is fully carded, and the fiber carding degree and the web definition are improved.
The main process configuration of cotton carding is shown in Table 2
TABLE 2 main technological configuration for carding cotton
3. Drawing process
And the drawing adopts two-step mixing and adopts the process principle of're-pressurization and low speed'. The drafting of the head and back area is controlled to be larger, the space is properly increased, the second drafting adopts smaller back area drafting, the reasonable drafting distribution is realized, the pressure of a leather roller is properly increased, the strip-discharging speed is reduced, the drafting stability is favorably realized, the fiber straightness is favorably improved, the neps are slightly increased, and the second drafting adopts a CSC short segment auto-leveling device of the Uster company to reduce the unevenness rate of the cooked strips and the unevenness rate of the weight; the leather roller is treated by anti-winding and non-woven type double-component large-proportion coating, and the relative humidity is controlled to be 60-65%; ensuring the quality of the semi-finished product of the cooked strips. The main process parameters of drawing are shown in Table 3.
Table 3: drawing main technological parameters
4. Roving process
The technological scheme of low speed, large spacing, heavy pressurizing, small back zone drafting and small tension is adopted. The roving ration is designed to be lighter; by using equal-height yarn guide angle flyers, the false twisting efficiency of rear row roving is improved, the accidental extension is reduced, and the roving process configuration is as follows: the fixed quantity of the roving is 5.0 g/10 m, the drafting multiple of the back zone is 1.18 times, the roller gauge is 11 multiplied by 28 multiplied by 40mm, the twist factor is 85, and the speed of the front roller is 210 r/min. A75-degree treatment-free leather roller is adopted, and the relative humidity is controlled to 64-68%. The roving Uster evenness CV is 5.3 percent, the weight unevenness is 0.6 percent, and the elongation is 0.8 percent.
5. Spinning process
The self-made ramie yarn imitation device of the spinning frame is adopted, the front roller and the middle and rear roller transmission systems of the spinning frame are separated, the speed change of the rollers in the spinning process is controlled by the independent servo transmission and servo control device of the front roller, the speed of the front roller is timely reduced according to the process setting according to the ramie imitation style requirement, and the ramie yarn imitation quality style spinning by taking the ramie regenerated cellulose fiber as the raw material is smoothly realized.
The spun yarn has the main process parameters as follows: the dry weight of spun yarn is 1.310 g/100 m, the total draft multiple is 38.2, the rear zone draft multiple is 1.18, the twist coefficient is 350, the roller gauge is 18 multiplied by 35mm, the gauge block is 2.5mm, the steel collar model is 4254, the steel wire ring model is 690312/0, and the relative humidity of the working procedure is controlled to be 58-64%.
The main rotating speed of the front roller is 200r/min, and the intermittent speed change is controlled by an independent servo transmission and servo control device: the front roller performs speed reduction and speed increase after each interval period, the speed reduction is 10-20% within 0.2-0.4 s, and the speed increase is performed to the original speed within 0.2-0.4 s after the speed reduction meets the set requirement; the interval period of each time is randomly generated within 3-8 s, and the speed reduction amplitude in the speed reduction process is randomly generated within 10-20%.
6. Spooling process
A POLAR type automatic bobbin winder is selected, and the process principle of low speed, small tension, reasonable yarn clearing and less damage is adopted. Adopts Meisidan 690 air splicer, reasonably sets the parameters of the air splicer, and ensures the splicing quality
The preparation of the weft yarn B29.3 tex L (flax)/R55/45 yarn and the warp yarn C R14.8tex belongs to the general production technology, but not the process.
7. Weaving 165CM R14.8tex × [ R14.8tex (Jutecell linen-like yarn) + R29.3tex L (flax)/R55/451: 1394 × 2761/1 ]
The weaving process flow comprises the following steps:
ASGA221 (180) batch warping machine → ASGA 365C-S double-slash slasher → G177 type heald-threading machine → ZAX (N) air jet loom → GA801 type cloth inspecting machine → G841 type plaiting → inspection → cloth repair → packing and warehousing.
The main technical measures are as follows:
(1) warping process
Warping is carried out according to three uniform requirements: the tension is uniform, the arrangement is uniform, the winding is uniform, wherein the tension is uniform, the tension device needs to be finely adjusted, all yarn channels of the warping machine are cleaned, burrs are eliminated, and the strength loss and broken ends of the yarns in the warping process are reduced; the vehicle speed is controlled at 300-350 m/min.
(2) Sizing process
The sizing adopts environment-friendly sizing agent, and the coating and the penetration are both considered. The formula is as follows: modified starch: 70kg, 60125 kg of high-performance slurry, 3kg of propylene slurry and 2.5 kg of wax sheets; the temperature of the slurry tank is 90 ℃, the viscosity of the slurry is 6.5', the pH value is 7-8, and the sizing rate is 9%; strictly controlling the tension of each section by using small tension as a principle, controlling the total elongation at 1.6 percent and controlling the vehicle speed at 70 m/min; the moisture regain is 10 percent.
(3) Drafting procedure
The strict operation is carried out during drafting, and the wrong drafting is prevented.
(4) Weaving process
The loom is a ZAX-N-2C double-jet air-jet loom, the speed is 560 r/min, the shaft mounting time is strictly regulated, the yarn splitting operation is uniform, no cross yarn exists, two bobbin fixing positions of R14.8tex (linen-like yarn) bobbin yarn and L (flax)/R29.3tex 55/45 bobbin yarn adopted by weft yarn are not allowed to be randomly changed, and the weft yarn is strictly circulated at an interval of 1: 1; the loom mainly comprises a loom processing technology: the opening time is 310 DEG/290 DEG, the on-machine tension is 1200N, the angle of the yarn stop pin is 60-260 DEG, the main injection angle is 50-140 DEG, the main injection pressure is 0.26-0.28 MPa, the auxiliary injection pressure is 50-130 DEG, 78-160 DEG, 106-188 DEG, 134-220 DEG, 162-250 DEG, 186-270 DEG, the auxiliary injection pressure is 0.26-0.28 MPa, and the arrival angle of weft yarn is 220-230 deg.
(5) Finishing procedure
Folding, inspecting, repairing, packaging and warehousing.
Claims (3)
1. The flax and viscose blended fabric is woven by warps and wefts in a plain weave mode, and is characterized in that:
the warp yarn is viscose fiber with 14.8 tex-9.8 tex, the weft yarn comprises weft yarn A and weft yarn B,
the weft yarn A is yarn made of 14.8-9.8 tex hemp regenerated cellulose Jutecell fibers by self-made hemp-imitating equipment and process, and has the quality and style characteristics of hemp yarn;
the weft B is a blended yarn of 36tex to 19.5tex formed by blending flax fibers and viscose fibers, and the blending ratio of the flax fibers to the viscose fibers in the weft B is 55: 45;
and the weft yarn A and the weft yarn B are arranged at intervals of 1:1 in sequence;
the flax and viscose blended fabric has the advantages that the width is 150-180 cm, the warp density is 350-400 pieces/10 cm, and the weft density is 250-300 pieces/10 cm;
preparation of weft yarn a: selecting 1.33dtex multiplied by 38mm and 1.33dtex multiplied by 10-1.33 dtex multiplied by 16mm of Jutecell fibers, and spinning into roving through blowing, cotton carding, drawing and roving processes; the front roller and the middle and rear roller transmission systems of the spinning machine are separated, and a front roller independent servo transmission and servo control device is additionally arranged to spin yarns imitating the quality style of the ramie yarn.
2. A processing technology of the flax and viscose blended fabric according to claim 1, which is characterized in that: the processing technology comprises the following steps:
step a, preparation of weft yarn A: selecting 1.33dtex multiplied by 38mm and 1.33dtex multiplied by 10-1.33 dtex multiplied by 16mm of Jutecell fibers, and spinning into roving through blowing, cotton carding, drawing and roving processes; separating a front roller from a middle and rear roller transmission system of a spinning machine, and additionally installing a front roller independent servo transmission and servo control device to spin yarns imitating the quality and style of ramie yarns;
step B, preparation of weft yarn B: blending flax fibers and viscose fibers according to the ratio of 55: 45; spooling for later use;
step c, selecting 1.33dex multiplied by 38mm of viscose fiber, and spinning 14.8 tex-9.8 tex warp yarns by a common conventional method; spooling for later use;
step d, a warping process, namely warping the yarns wound in the step c in batches by adopting a warping machine;
step e, weaving procedure: weaving by using an air jet loom, wherein weft yarn A and weft yarn B are woven according to the proportion of 1:1 weaving in;
step f, post-finishing: and e, folding, inspecting, repairing, packaging and warehousing the fabric woven in the step e.
3. The processing technology of the flax and viscose blended fabric according to claim 2, characterized in that: in the step a, when spinning yarns imitating the quality and style of the ramie yarns, a self-made ramie yarn spinning device is used for spinning the ramie yarns, a front roller of the spinning machine is separated from a middle and rear roller transmission system, and the speed of the front roller is controlled by an independent servo transmission and servo control device to perform intermittent speed change: the front roller performs speed reduction and speed increase after each interval period, the speed reduction is 10-20% within 0.2-0.4 s, and the speed increase is performed to the original speed within 0.2-0.4 s after the speed reduction meets the set requirement; the interval period is 3-8 s, and adjacent interval periods are randomly generated.
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