Method for preparing woven fabric from recycled fibers

Abstract

The invention provides a method for preparing a woven fabric from recycled fibers, which comprises the following steps: S1, opening a waste cotton woven fabric to obtain recycled cotton fibers with the length of 25-40mm, and carding, drawing and roving regenerated cotton fibers to obtain regenerated cotton short fiber roving; s2, the electrostatic spinning composite fiber bundles are arranged on a creel of a common spinning frame, the regenerated cotton staple fiber roving is arranged below the creel of the common spinning frame, the regenerated cotton staple fiber roving is fed through a horn mouth of a traversing gear, the regenerated cotton staple fiber roving is drawn, combined and twisted to be spun into core-spun yarn, the core material is the regenerated staple fiber roving, the covering material is the electrostatic spinning composite fiber bundles, and the core-spun yarn is obtained; and S3, weaving the covering yarn prepared in the step S2 into a fabric by adopting a plain weave. According to the method, the waste cotton woven fabric is subjected to opening, cotton carding, drawing, roving and electrostatic spinning, composite fiber bundles are made into the covering yarn, then the covering yarn is made into the fabric through the weaving technology, and the woven fabric with the good heat preservation effect is obtained.

Description

Technical Field

[0001] The invention relates to the field of functional fabrics, and in particular to a method for preparing woven fabrics by utilizing recycled fibers. Background Art

[0002] With the increasing awareness of environmental protection in all sectors of society, more and more textile companies have begun to study the reuse of waste textiles. As an emerging industry, the recycling of waste textiles has not yet formed a sound recycling system, but its advantages lie in the abundant raw materials, low cost and low investment. It can not only alleviate the current shortage of resources in the textile industry, but also reduce the pollution of waste treatment to the environment, and has considerable economic and social benefits.

[0003] At present, the recycled waste textiles are mainly used for second-hand sales or donations, chemical recycling, physical recycling and energy recovery. Among them, second-hand sales account for about 30%, 50% is used for physical recycling, chemical reuse accounts for 10%, and the rest is used for energy recovery. The principle of mechanical recycling is simple. It mainly targets the scraps of textile factories and garment factories and recycled old clothes. These waste textiles are sorted and cut, and then loosened and combed into single fibers, mixed with new fibers and re-spun into recycled yarn. The essence of mechanical recycling is that the waste fabrics are cut, hit and torn by the loosening equipment, so that the single fibers are loosened and decomposed from the fabric. This process is the reverse process of textile engineering. The fibers need to be subjected to greater force to be pulled out of the fabric. Therefore, the loosened fibers are shorter in length, with reduced strength and quality. The length of the regenerated cotton fiber opened by mechanical method is different due to different opening raw materials. For example, the regenerated fiber opened from undyed fabrics with low warp and weft density has good quality, and the average fiber length is about 19mm. It can be mixed with new fibers and spun again and reused in clothing manufacturing, while fibers below 15mm are mostly used to prepare low value-added products, such as filling flocs. At present, the production practice of regenerated cotton fiber re-spinning mostly uses the cotton wool in the spinning workshop. This type of regenerated cotton fiber is less damaged and has good quality, and the mixing ratio can be appropriately increased. However, for the regenerated cotton fiber re-opened from waste textiles, the proportion of recycled yarn is low, often only 20%, and the regenerated cotton yarn suitable for spinning is coarse, low in strength, more hairiness, and poor yarn dryness. Therefore, by studying the spinnability of regenerated cotton fibers, judging the applicable occasions of each type of regenerated cotton fibers, optimizing the spinning process to increase the mixing ratio and yarn quality of regenerated cotton fibers, and maximizing the utilization of waste textiles. Summary of the invention

[0004] Technical problem to be solved: The purpose of the present invention is to provide a method for preparing woven fabrics using recycled fibers, wherein waste cotton woven fabrics are opened, carded, drawn, coarsely sanded, and made into core-spun yarn with electrostatically spun composite fiber bundles, and then the core-spun yarn is made into fabrics through a weaving process, thereby providing a woven fabric with good thermal insulation effect.

[0005] Technical solution: A method for preparing woven fabrics using recycled fibers, comprising the following steps: S1. The waste cotton woven fabric is opened to obtain recycled cotton fibers with a length of 25-40 mm, and the regenerated cotton fibers are carded, drawn and roved to obtain regenerated cotton staple rovings; Among them, in the carding process, the distance between the cotton feeding plate and the licker-in roller is 0.25-0.35mm, the five-point distance between the cylinder and the cover plate is: 0.23-0.26mm, 0.16-0.23mm, 0.16-0.20mm, 0.18-0.20mm, 0.20-0.23mm, the distance between the cylinder and the rear fixed cover plate from bottom to top is: 0.38-0.55mm, 0.31-0.40mm, 0.28-0.40mm, the distance between the cylinder and the front fixed cover plate from top to bottom is: 0.20-0.26mm, 0.18-0.23mm, 0.15-0.20mm, 0.16-0.20mm, the distance between the cylinder and the doffer is 0.09-0.12mm; In the drawing process, four-roller double-zone drafting is adopted, the number of combined strands in the first drawing is 6, the drafting multiple is 5.5-6 times, the number of combined strands in the second drawing is 8, and the drafting multiple is 7.5-8 times; In the roving process, the total drafting multiple is 4.1-4.5 times, the drafting multiple in the back zone is 1.10-1.30 times, and the twist is 2-4 twists / 10cm; S2. The electrospun composite fiber bundle is discharged on the roving frame on the roving frame of the ordinary spinning frame, and the regenerated cotton staple roving is discharged below. The regenerated cotton staple roving is fed through the bell mouth of the traverse device and then through the drafting device. The total drafting multiple is 30-45 times, the drafting multiple in the rear zone is 1.25-1.42 times, and the twist is 110-120 twists / 10cm. After the electrospun composite fiber bundle is drawn out, it is not passed through the drafting device, but is directly introduced into the collector on the rear side of the front roller roller and combined with the regenerated cotton staple roving after the drafting, twisted and spun into a core-spun yarn, wherein the core material is regenerated staple coarse sand, the coating material is an electrospun composite fiber bundle, and the weight percentage of the core material and the coating material is 40-50:35-48, to obtain a core-spun yarn with a linear density of 17.5-26.2tex; S3. The core-spun yarn prepared in step S2 is woven into a plain weave fabric with a warp density of 310-330 strands / 10cm, a longitudinal density of 260-280 strands / 10cm, and a fabric weight of 130-142g / m 2, thickness is 0.55-0.58mm.

[0006] Preferably, the method for preparing the electrospun composite fiber bundle comprises the following steps: S11. The waste coffee grounds were soaked in boiling water, then washed with deionized water until the deionized water was colorless, filtered and dried in an oven, and the dried coffee grounds were steam exploded, the steam pressure was set to 0.2-0.5Mpa, and the pressure maintenance time was 150-250s; S12. The coffee grounds pretreated by steam explosion were crushed through a 300-500 mesh sieve, first crushed by a jet mill, the crushing pressure was 1.20-1.45 MPa, the grinding time was 20-50 min, and then placed in a nano ball mill for dry grinding for 2-8h, zirconia balls were used as grinding media, and the ball-to-material volume ratio was 3:1 to obtain coffee powder; S13. The coffee powder is instantaneously surface carbonized to obtain surface carbonized coffee powder; S14 with a concentration of 8% LiCl / DMAc solvent system to dissolve bamboo pulp, and thereto was added a certain amount of coffee powder, the mass fraction of bamboo cellulose were formulated into 3.5-5wt% spinning solution; S15. PAN was dissolved in a 8% LiCl / DMAc solvent system, and a certain amount of nano far-infrared ceramic powder was added thereto to form a spinning solution having a mass fraction of PAN of 11.5-15.6wt%; S16. The fibers formed by electrospinning were deposited in a coagulation bath using a double-needle electrospinning technique, and the cellulose was collected by guiding and drawn to obtain an electrospun composite fiber bundle.

[0007] Preferably, in step S13, the instantaneous carbonization temperature is 600-800° C. and the time is 10-30 seconds.

[0008] Preferably, the mass fraction of the coffee powder added to the spinning solution in step S14 is 0.2-0.5wt%.

[0009] Preferably, the nano far-infrared ceramic powder in step S15 is ZrC.

[0010] Preferably, in step S15, the mass fraction of ZrC added to the spinning solution is 0.8-1.5wt%.

[0011] Preferably, in step S16, the spinning voltage is 20-25 kV, the needle spinning solution flow rate is 0.1 mL / h, the distance between the needle tip and the coagulation bath is 50-80 mm, and the drafting multiple is 1.2-1.5 times.

[0012] Beneficial effects: The preparation method of the present invention has the following advantages: In the present invention, the gauge of the licker-in roller and the cotton feeding plate is appropriately increased, so that the short-lint rate can be reduced. The gauge of the gauge between the cylinder and the cover plate is large, which can reduce fiber plugging and further decompose the recycled cotton fiber. As the fiber is transmitted between the cylinder and the cover plate, the gauge becomes smaller and larger. The smaller the gauge, the deeper the needle will penetrate into the fiber layer, which is beneficial to the combing of the recycled cotton fiber. After drawing and coarse sand drafting, the fiber can have better parallel straightness and separation. The spinning method of the core-spun yarn of the present invention can enhance the strength of the yarn, reduce the hairiness, and make the yarn more uniform. The twist number of the spinning is strictly controlled during the spinning process: the twist number will affect the strength of the yarn, and it is easy to pilling, or holes are easy to appear during the weaving process, and the twist of the cloth surface is increased. The spinning method of the present invention not only improves the strength of the yarn, but also improves the anti-pilling performance of the fabric, and also reflects the hand feel and comfort characteristics of the bamboo fiber, and the final fabric product has a basic guarantee for a good appearance; The present invention adopts an electrostatically spun composite fiber bundle to cover a regenerated cotton staple yarn to obtain a core-spun yarn, wherein the core material is regenerated staple coarse sand, and the covering material is an electrostatically spun composite fiber bundle. The electrostatically spun composite fiber bundle contains two kinds of electrostatically spun fibers, one is an electrostatically spun fiber containing coffee powder, and the other is an electrostatically spun fiber containing nano far-infrared ceramic powder. The coffee powder is processed to obtain a multi-layered hollow porous powder, which can improve the heat preservation effect of the fiber, and the nano far-infrared ceramic powder can generate heat, thereby further improving the heat preservation effect of the fabric. The thermal insulation capacity of fabric is not only related to the performance of fiber raw materials, but the fabric structure is also an important influencing factor. The plain woven fabric for core-spun yarn prepared by the present invention can also achieve a higher thermal insulation effect. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with embodiments, which are explanations of the present invention and are not limited to the following embodiments: Example 1

[0014] The preparation method of the electrospun composite fiber bundle comprises the following steps: S11. The waste coffee grounds were soaked in boiling water, then washed with deionized water until the deionized water was colorless, filtered and dried in an oven, and the dried coffee grounds were steam exploded, the steam pressure was set to 0.2Mpa, and the pressure maintenance time was 250s; S12. The coffee grounds pretreated by steam explosion were crushed through a 300-mesh sieve, and then crushed by a jet mill at a crushing pressure of 1.20 MPa for 20 min, and then dry-milled in a nano ball mill for 8 h, using zirconium oxide balls as grinding media, with a ball-to-material volume ratio of 3:1, to obtain coffee powder; S13. The coffee powder is subjected to instantaneous surface carbonization at a temperature of 600°C for 30 seconds to obtain surface carbonized coffee powder; S14 with a concentration of 8% LiCl / DMAc solvent system to dissolve bamboo pulp, and thereto was added a certain amount of coffee powder, the mass fraction of coffee powder added to the spinning solution was 0.2wt%, the mass fraction of bamboo cellulose was matched to form a spinning solution of 3.5wt%; S15. PAN was dissolved in a 8% LiCl / DMAc solvent system, and a certain amount of nano ZrC was added thereto, the mass fraction of ZrC added to the spinning solution was 0.8wt%, and the mass fraction of PAN was 15.6wt% of the spinning solution; S16. The double-needle electrospinning technology was used for spinning. The fibers formed by electrospinning were deposited in a coagulation bath. The cellulose was then collected and stretched by guiding. The spinning voltage was 20 kV, the needle spinning liquid flow rate was 0.1 mL / h, the distance between the needle tip and the coagulation bath was 50 mm, and the stretching multiple was 1.2 times to obtain an electrospun composite fiber bundle. Example 2

[0015] The preparation method of the electrospun composite fiber bundle comprises the following steps: S11. The waste coffee grounds were soaked in boiling water, then washed with deionized water until the deionized water was colorless, filtered and dried in an oven, and the dried coffee grounds were steam exploded, the steam pressure was set to 0.5Mpa, and the pressure maintenance time was 150s; S12. The coffee grounds pretreated by steam explosion were crushed through a 500-mesh sieve, and then crushed by a jet mill at a crushing pressure of 1.45 MPa for 50 min, and then dry-milled in a nano ball mill for 2 h, using zirconium oxide balls as grinding media, with a ball-to-material volume ratio of 3:1, to obtain coffee powder; S13. The coffee powder is subjected to instantaneous surface carbonization at a temperature of 800°C for 10 seconds to obtain surface carbonized coffee powder; S14 with a concentration of 8% LiCl / DMAc solvent system to dissolve bamboo pulp, and thereto was added a certain amount of coffee powder, the mass fraction of coffee powder added to the spinning solution was 0.5wt%, formulated into bamboo cellulose mass fraction of 5wt% spinning solution; S15. PAN was dissolved in a 8% LiCl / DMAc solvent system, and a certain amount of nano ZrC was added thereto, the mass fraction of ZrC added to the spinning solution was 1.5wt%, and the mass fraction of PAN was 11.5wt% of the spinning solution; S16. The double-needle electrospinning technology was used for spinning. The fibers formed by electrospinning were deposited in a coagulation bath. The cellulose was then collected by guidance and stretched. The spinning voltage was 25 kV, the needle spinning liquid flow rate was 0.1 mL / h, the distance between the needle tip and the coagulation bath was 80 mm, and the stretching multiple was 1.2 times to obtain an electrospun composite fiber bundle. Example 3

[0016] The preparation method of the electrospun composite fiber bundle comprises the following steps: S11. The waste coffee grounds were soaked in boiling water, then washed with deionized water until the deionized water was colorless, filtered and dried in an oven, and the dried coffee grounds were steam exploded, the steam pressure was set to 0.3Mpa, and the pressure maintenance time was 180s; S12. The coffee grounds pretreated by steam explosion were crushed through a 400-mesh sieve, and then crushed by a jet mill at a crushing pressure of 1.25 MPa for 30 min, and then dry-milled in a nano ball mill for 4 h, using zirconium oxide balls as grinding media, with a ball-to-material volume ratio of 3:1, to obtain coffee powder; S13. The coffee powder is instantaneously carbonized at a temperature of 650°C for 25 seconds to obtain a surface carbonized coffee powder; S14 with a concentration of 8% LiCl / DMAc solvent system to dissolve bamboo pulp, and thereto was added a certain amount of coffee powder, the mass fraction of coffee powder added to the spinning solution was 0.3wt%, formulated into bamboo cellulose mass fraction of 4.5wt% spinning solution; S15. PAN was dissolved in a 8% LiCl / DMAc solvent system, and a certain amount of nano ZrC was added thereto, the mass fraction of ZrC added to the spinning solution was 0.9wt%, and the mass fraction of PAN was 12.5wt% of the spinning solution; S16. The double-needle electrospinning technology was used for spinning. The fibers formed by electrospinning were deposited in a coagulation bath. The cellulose was then collected and stretched by guiding. The spinning voltage was 20 kV, the needle spinning liquid flow rate was 0.1 mL / h, the distance between the needle tip and the coagulation bath was 60 mm, and the stretching multiple was 1.3 times to obtain an electrospun composite fiber bundle. Example 4

[0017] The preparation method of the electrospun composite fiber bundle comprises the following steps: S11. The waste coffee grounds were soaked in boiling water, then washed with deionized water until the deionized water was colorless, filtered and dried in an oven, and the dried coffee grounds were steam exploded, the steam pressure was set to 0.4Mpa, and the pressure maintenance time was 220s; S12. The coffee grounds pretreated by steam explosion were crushed through a 450-mesh sieve, and then crushed by a jet mill at a crushing pressure of 1.35 MPa for 40 min, and then dry-milled in a nano ball mill for 7 h, using zirconium oxide balls as grinding media, with a ball-to-material volume ratio of 3:1, to obtain coffee powder; S13. The coffee powder is instantaneously carbonized at a temperature of 750°C for 15 seconds to obtain a surface carbonized coffee powder; S14 with a concentration of 8% LiCl / DMAc solvent system to dissolve bamboo pulp, and thereto was added a certain amount of coffee powder, the mass fraction of coffee powder added to the spinning solution was 0.4wt%, formulated into bamboo cellulose mass fraction of 4wt% of the spinning solution; S15. PAN was dissolved in a 8% LiCl / DMAc solvent system, and a certain amount of nano ZrC was added thereto, the mass fraction of ZrC added to the spinning solution was 1.2wt%, and the mass fraction of PAN was 14wt% of the spinning solution; S16. The double-needle electrospinning technology was used for spinning. The fibers formed by electrospinning were deposited in a coagulation bath. The cellulose was then collected and stretched by guiding. The spinning voltage was 25 kV, the needle spinning liquid flow rate was 0.1 mL / h, the distance between the needle tip and the coagulation bath was 70 mm, and the stretching multiple was 1.4 times to obtain an electrospun composite fiber bundle. Example 5

[0018] A method for preparing a woven fabric using recycled fibers comprises the following steps: S1. The waste cotton woven fabric is opened to obtain recycled cotton fibers with a length of 25-40 mm, and the regenerated cotton fibers are carded, drawn and roved to obtain regenerated cotton staple rovings; Among them, in the carding process, the distance between the cotton feeding plate and the licker-in roller is 0.25mm, the five-point distances between the cylinder and the cover are: 0.23mm, 0.16mm, 0.16mm, 0.18mm, 0.20mm, the distance between the cylinder and the rear fixed cover from bottom to top is: 0.38mm, 0.31mm, 0.28mm, the distance between the cylinder and the front fixed cover from top to bottom is: 0.20mm, 0.18mm, 0.15mm, 0.16mm, the distance between the cylinder and the doffer is 0.09mm; In the drawing process, four-roller double-zone drafting is adopted, the number of combined strands in the first drawing is 6, the drafting multiple is 5.5 times, the number of combined strands in the second drawing is 8, and the drafting multiple is 7.5 times; In the roving process, the total drafting multiple is 4.5 times, the drafting multiple in the back zone is 1.10 times, and the twist is 2 twists / 10cm; S2. The electrospun composite fiber bundle prepared in Example 1 is placed on the roving frame of the roving frame of the ordinary spinning frame, and the regenerated cotton staple roving is placed below. The regenerated cotton staple roving is fed through the bell mouth of the traverse device and then passed through the drafting device. The total drafting multiple is 30 times, the drafting multiple in the rear zone is 1.25 times, and the twist is 110 twists / 10cm. After the electrospun composite fiber bundle is drawn out, it is not passed through the drafting device, but is directly introduced into the collector on the rear side of the front roller roller to be combined with the regenerated cotton staple roving after drafting, and twisted and spun into core-spun yarn, wherein the core material is regenerated staple coarse sand, the coating material is the electrospun composite fiber bundle, the weight percentage of the core material and the coating material is 40:35, and the core-spun yarn with a linear density of 17.8tex is obtained; S3. The core-spun yarn prepared in step S2 is woven into a plain weave fabric with a warp density of 310 strands / 10cm, a longitudinal density of 260 strands / 10cm, and a fabric weight of 130g / m 2 , thickness is 0.55mm. Example 6

[0019] A method for preparing a woven fabric using recycled fibers comprises the following steps: S1. The waste cotton woven fabric is opened to obtain recycled cotton fibers with a length of 25-40 mm, and the regenerated cotton fibers are carded, drawn and roved to obtain regenerated cotton staple rovings; Among them, in the carding process, the distance between the cotton feeding plate and the licker-in roller is 0.35mm, the five-point distances between the cylinder and the cover are: 0.26mm, 0.23mm, 0.20mm, 0.20mm, 0.23mm, the distance between the cylinder and the rear fixed cover from bottom to top is: 0.55mm, 0.40mm, 0.40mm, the distance between the cylinder and the front fixed cover from top to bottom is: 0.26mm, 0.23mm, 0.20mm, 0.20mm, the distance between the cylinder and the doffer is 0.12mm; In the drawing process, four-roller double-zone drafting is adopted, the number of combined strands in the first drawing is 6, the drafting multiple is 6 times, the number of combined strands in the second drawing is 8, and the drafting multiple is 8 times; In the roving process, the total drafting multiple is 4.1 times, the drafting multiple in the back zone is 1.30 times, and the twist is 4 twists / 10cm; S2. The electrospun composite fiber bundle prepared in Example 2 is placed on the roving frame of the roving frame of the ordinary spinning frame, and the regenerated cotton staple roving is placed below. The regenerated cotton staple roving is fed through the bell mouth of the traverse device and then passed through the drafting device. The total drafting multiple is 45 times, the drafting multiple in the rear zone is 1.42 times, and the twist is 120 twists / 10cm. After the electrospun composite fiber bundle is drawn out, it is not passed through the drafting device, but is directly introduced into the collector on the rear side of the front roller roller to be combined with the regenerated cotton staple roving after drafting, and twisted and spun into core-spun yarn, wherein the core material is regenerated staple coarse sand, the coating material is the electrospun composite fiber bundle, the weight percentage of the core material and the coating material is 50:48, and the core-spun yarn with a linear density of 25.5tex is obtained; S3. The core-spun yarn prepared in step S2 is woven into a plain weave fabric with a warp density of 330 strands / 10cm, a longitudinal density of 280 strands / 10cm, and a fabric weight of 142g / m 2 , thickness is 0.58mm. Example 7

[0020] A method for preparing a woven fabric using recycled fibers comprises the following steps: S1. The waste cotton woven fabric is opened to obtain recycled cotton fibers with a length of 25-40 mm, and the regenerated cotton fibers are carded, drawn and roved to obtain regenerated cotton staple rovings; Among them, in the carding process, the distance between the cotton feeding plate and the licker-in roller is 0.25mm, the five-point distances between the cylinder and the cover are: 0.23mm, 0.16mm, 0.16mm, 0.18mm, 0.20mm, the distance between the cylinder and the rear fixed cover from bottom to top is: 0.38mm, 0.31mm, 0.28mm, the distance between the cylinder and the front fixed cover from top to bottom is: 0.20mm, 0.18mm, 0.15mm, 0.16mm, the distance between the cylinder and the doffer is 0.09mm; In the drawing process, four-roller double-zone drafting is adopted, the number of combined strands in the first drawing is 6, the drafting multiple is 5.5 times, the number of combined strands in the second drawing is 8, and the drafting multiple is 7.5 times; In the roving process, the total drafting multiple is 4.5 times, the drafting multiple in the back zone is 1.10 times, and the twist is 2 twists / 10cm; S2. The electrospun composite fiber bundle prepared in Example 3 is placed on the roving frame of the roving frame of the ordinary spinning frame, and the regenerated cotton staple roving is placed below. The regenerated cotton staple roving is fed through the bell mouth of the traverse device and then passed through the drafting device. The total drafting multiple is 30 times, the drafting multiple in the rear zone is 1.25 times, and the twist is 110 twists / 10cm. After the electrospun composite fiber bundle is drawn out, it is not passed through the drafting device, but is directly introduced into the collector on the rear side of the front roller roller to be combined with the regenerated cotton staple roving after drafting, and twisted and spun into core-spun yarn, wherein the core material is regenerated staple coarse sand, and the coating material is the electrospun composite fiber bundle. The weight percentage of the core material and the coating material is 40:35, and the core-spun yarn with a linear density of 17.8tex is obtained; S3. The core-spun yarn prepared in step S2 is woven into a plain weave fabric with a warp density of 320 strands / 10cm, a longitudinal density of 265 strands / 10cm, and a fabric weight of 134g / m 2 , thickness is 0.56mm. Example 8

[0021] A method for preparing a woven fabric using recycled fibers comprises the following steps: S1. The waste cotton woven fabric is opened to obtain recycled cotton fibers with a length of 25-40 mm, and the regenerated cotton fibers are carded, drawn and roved to obtain regenerated cotton staple rovings; Among them, in the carding process, the distance between the cotton feeding plate and the licker-in roller is 0.35mm, the five-point distances between the cylinder and the cover are: 0.26mm, 0.23mm, 0.20mm, 0.20mm, 0.23mm, the distance between the cylinder and the rear fixed cover from bottom to top is: 0.55mm, 0.40mm, 0.40mm, the distance between the cylinder and the front fixed cover from top to bottom is: 0.26mm, 0.23mm, 0.20mm, 0.20mm, the distance between the cylinder and the doffer is 0.12mm; In the drawing process, four-roller double-zone drafting is adopted, the number of combined strands in the first drawing is 6, the drafting multiple is 6 times, the number of combined strands in the second drawing is 8, and the drafting multiple is 8 times; In the roving process, the total drafting multiple is 4.1 times, the drafting multiple in the back zone is 1.30 times, and the twist is 4 twists / 10cm; S2. The electrospun composite fiber bundle prepared in Example 4 is placed on the roving frame of the roving frame of the ordinary spinning frame, and the regenerated cotton staple roving is placed below. The regenerated cotton staple roving is fed through the bell mouth of the traverse device and then passed through the drafting device. The total drafting multiple is 45 times, the drafting multiple in the rear zone is 1.42 times, and the twist is 120 twists / 10cm. After the electrospun composite fiber bundle is drawn out, it is not passed through the drafting device, but is directly introduced into the collector on the rear side of the front roller roller to be combined with the regenerated cotton staple roving after drafting, and twisted and spun into core-spun yarn, wherein the core material is regenerated staple coarse sand, the coating material is the electrospun composite fiber bundle, the weight percentage of the core material and the coating material is 50:48, and the core-spun yarn with a linear density of 25.5tex is obtained; S3. The core-spun yarn prepared in step S2 is woven into a plain weave fabric with a warp density of 325 strands / 10cm, a longitudinal density of 275 strands / 10cm, and a fabric weight of 140g / m 2 , thickness is 0.57mm.

[0022] Comparative Example 1 A method for preparing a woven fabric using recycled fibers comprises the following steps: S1. The waste cotton woven fabric is opened to obtain recycled cotton fibers with a length of 25-40 mm, and the regenerated cotton fibers are carded, drawn and roved to obtain regenerated cotton staple rovings; Among them, in the carding process, the distance between the cotton feeding plate and the licker-in roller is 0.35mm, the five-point distances between the cylinder and the cover are: 0.26mm, 0.23mm, 0.20mm, 0.20mm, 0.23mm, the distance between the cylinder and the rear fixed cover from bottom to top is: 0.55mm, 0.40mm, 0.40mm, the distance between the cylinder and the front fixed cover from top to bottom is: 0.26mm, 0.23mm, 0.20mm, 0.20mm, the distance between the cylinder and the doffer is 0.12mm; In the drawing process, four-roller double-zone drafting is adopted, the number of combined strands in the first drawing is 6, the drafting multiple is 6 times, the number of combined strands in the second drawing is 8, and the drafting multiple is 8 times; In the roving process, the total drafting multiple is 4.1 times, the drafting multiple in the back zone is 1.30 times, and the twist is 4 twists / 10cm; S2. Bamboo fiber is discharged on the roving frame of the roving frame of the ordinary spinning frame, and the regenerated cotton staple roving is discharged below. The regenerated cotton staple roving is fed through the bell mouth of the traverse device, and then through the drafting device. The total drafting multiple is 45 times, the drafting multiple of the rear zone is 1.42 times, and the twist is 120 twists / 10cm. After the bamboo fiber is drawn out, it is not passed through the drafting device, and is directly introduced into the collector on the rear side of the front roller roller and combined with the regenerated cotton staple roving after the drafting, twisted and spun into a core-spun yarn, wherein the core material is regenerated staple coarse sand, the coating material is bamboo fiber, and the weight percentage of the core material and the coating material is 50:45, to obtain a core-spun yarn with a linear density of 23.6tex; S3. The core-spun yarn prepared in step S2 is woven into a plain weave fabric with a warp density of 320 strands / 10cm, a longitudinal density of 260 strands / 10cm, and a fabric weight of 132g / m 2 , thickness is 0.56mm.

[0023] Comparative Example 2 The preparation method of the electrospun composite fiber bundle comprises the following steps: S11. The waste coffee grounds were soaked in boiling water, then washed with deionized water until the deionized water was colorless, filtered and dried in an oven, and the dried coffee grounds were steam exploded, the steam pressure was set to 0.4Mpa, and the pressure maintenance time was 220s; S12. The coffee grounds pretreated by steam explosion were crushed through a 450-mesh sieve, and then crushed by a jet mill at a crushing pressure of 1.35 MPa for 40 min, and then dry-milled in a nano ball mill for 7 h, using zirconium oxide balls as grinding media, with a ball-to-material volume ratio of 3:1, to obtain coffee powder; S13. The coffee powder is instantaneously carbonized at a temperature of 750°C for 15 seconds to obtain a surface carbonized coffee powder; S14 with a concentration of 8% LiCl / DMAc solvent system to dissolve bamboo pulp, and thereto was added a certain amount of coffee powder, the mass fraction of coffee powder added to the spinning solution was 0.4wt%, formulated into bamboo cellulose mass fraction of 4wt% of the spinning solution; S15. PAN was dissolved in a 8% LiCl / DMAc solvent system to prepare a spinning solution having a mass fraction of PAN of 14wt%; S16. The double-needle electrospinning technology was used for spinning. The fibers formed by electrospinning were deposited in a coagulation bath. The cellulose was then collected and stretched by guiding. The spinning voltage was 25 kV, the needle spinning liquid flow rate was 0.1 mL / h, the distance between the needle tip and the coagulation bath was 70 mm, and the stretching multiple was 1.4 times to obtain an electrospun composite fiber bundle.

[0024] A method for preparing a woven fabric using recycled fibers comprises the following steps: S1. The waste cotton woven fabric is opened to obtain recycled cotton fibers with a length of 25-40 mm, and the regenerated cotton fibers are carded, drawn and roved to obtain regenerated cotton staple rovings; Among them, in the carding process, the distance between the cotton feeding plate and the licker-in roller is 0.35mm, the five-point distances between the cylinder and the cover are: 0.26mm, 0.23mm, 0.20mm, 0.20mm, 0.23mm, the distance between the cylinder and the rear fixed cover from bottom to top is: 0.55mm, 0.40mm, 0.40mm, the distance between the cylinder and the front fixed cover from top to bottom is: 0.26mm, 0.23mm, 0.20mm, 0.20mm, the distance between the cylinder and the doffer is 0.12mm; In the drawing process, four-roller double-zone drafting is adopted, the number of combined strands in the first drawing is 6, the drafting multiple is 6 times, the number of combined strands in the second drawing is 8, and the drafting multiple is 8 times; In the roving process, the total drafting multiple is 4.1 times, the drafting multiple in the back zone is 1.30 times, and the twist is 3 twists / 10cm; S2. The electrospun composite fiber bundle prepared above is discharged on the roving frame on the roving frame of the ordinary spinning frame, and the regenerated cotton staple roving is discharged below. The regenerated cotton staple roving is fed through the bell mouth of the traverse device, and then through the drafting device. The total drafting multiple is 45 times, the drafting multiple in the rear zone is 1.42 times, and the twist is 120 twists / 10cm. After the electrospun composite fiber bundle is drawn out, it is not passed through the drafting device, but is directly introduced into the collector on the rear side of the front roller roller and combined with the regenerated cotton staple roving after drafting, twisted and spun into a core-spun yarn, wherein the core material is regenerated staple coarse sand, the coating material is an electrospun composite fiber bundle, and the weight percentage of the core material and the coating material is 50:48, to obtain a core-spun yarn with a linear density of 26.2ex; S3. The core-spun yarn prepared in step S2 is woven into a plain weave fabric with a warp density of 330 strands / 10cm, a longitudinal density of 278 strands / 10cm, and a fabric weight of 141g / m 2 , thickness is 0.57mm.

[0025] Comparative Example 3 The preparation method of the electrospun composite fiber bundle comprises the following steps: S11 with a concentration of 8% LiCl / DMAc solvent system to dissolve bamboo pulp, and the mass fraction of bamboo cellulose was 4.5wt% of the spinning solution; S12. PAN was dissolved in a 8% LiCl / DMAc solvent system, and a certain amount of nano ZrC was added thereto, the mass fraction of ZrC added to the spinning solution was 0.9wt%, and the mass fraction of PAN was 12.5wt% of the spinning solution; S13. The double-needle electrospinning technology was used for spinning. The fibers formed by electrospinning were deposited in a coagulation bath. The cellulose was then collected and stretched by guiding. The spinning voltage was 20 kV, the needle spinning liquid flow rate was 0.1 mL / h, the distance between the needle tip and the coagulation bath was 60 mm, and the stretching multiple was 1.3 times to obtain an electrospun composite fiber bundle.

[0026] A method for preparing a woven fabric using recycled fibers comprises the following steps: S1. The waste cotton woven fabric is opened to obtain recycled cotton fibers with a length of 25-40 mm, and the regenerated cotton fibers are carded, drawn and roved to obtain regenerated cotton staple rovings; Among them, in the carding process, the distance between the cotton feeding plate and the licker-in roller is 0.35mm, the five-point distances between the cylinder and the cover are: 0.26mm, 0.23mm, 0.20mm, 0.20mm, 0.23mm, the distance between the cylinder and the rear fixed cover from bottom to top is: 0.55mm, 0.40mm, 0.40mm, the distance between the cylinder and the front fixed cover from top to bottom is: 0.26mm, 0.23mm, 0.20mm, 0.20mm, the distance between the cylinder and the doffer is 0.12mm; In the drawing process, four-roller double-zone drafting is adopted, the number of combined strands in the first drawing is 6, the drafting multiple is 5.8 times, the number of combined strands in the second drawing is 8, and the drafting multiple is 8 times; In the roving process, the total drafting multiple is 4.1 times, the drafting multiple in the back zone is 1.25 times, and the twist is 3 twists / 10cm; S2. The electrospun composite fiber bundle prepared above is discharged on the roving frame on the roving frame of the ordinary spinning frame, and the regenerated cotton staple roving is discharged below. The regenerated cotton staple roving is fed through the bell mouth of the traverse device, and then through the drafting device. The total drafting multiple is 45 times, the drafting multiple in the rear zone is 1.45 times, and the twist is 130 twists / 10cm. After the electrospun composite fiber bundle is drawn out, it is not passed through the drafting device, but is directly introduced into the collector on the rear side of the front roller roller and combined with the regenerated cotton staple roving after drafting, twisted and spun into a core-spun yarn, wherein the core material is regenerated staple coarse sand, the coating material is an electrospun composite fiber bundle, and the weight percentage of the core material and the coating material is 50:48, to obtain a core-spun yarn with a linear density of 25.2ex; S3. The core-spun yarn prepared in step S2 is woven into a plain weave fabric with a warp density of 315 strands / 10cm, a longitudinal density of 275 strands / 10cm, and a fabric weight of 138g / m 2 , thickness is 0.56mm.

[0027] Comparative Example 4 The preparation method of the electrospun composite fiber bundle comprises the following steps: S11. The waste coffee grounds were soaked in boiling water, then washed with deionized water until the deionized water was colorless, filtered and the residue was dried and ground in an oven to obtain coffee powder; S12 with a concentration of 8% LiCl / DMAc solvent system to dissolve bamboo pulp, and thereto was added a certain amount of 500 mesh coffee powder, the mass fraction of coffee powder added to the spinning solution was 0.4wt%, the mass fraction of bamboo cellulose were matched to 4wt% of the spinning solution; S13. PAN was dissolved in a 8% LiCl / DMAc solvent system, and a certain amount of nano-ZrC was added thereto, the mass fraction of ZrC added to the spinning solution was 1.2wt%, and the mass fraction of PAN was 14wt% of the spinning solution; S14. The double-needle electrospinning technology was used for spinning. The fibers formed by electrospinning were deposited in a coagulation bath. The cellulose was then collected and stretched by guiding. The spinning voltage was 25 kV, the needle spinning liquid flow rate was 0.1 mL / h, the distance between the needle tip and the coagulation bath was 70 mm, and the stretching multiple was 1.4 times to obtain an electrospun composite fiber bundle.

[0028] A method for preparing a woven fabric using recycled fibers comprises the following steps: S1. The waste cotton woven fabric is opened to obtain recycled cotton fibers with a length of 25-40 mm, and the regenerated cotton fibers are carded, drawn and roved to obtain regenerated cotton staple rovings; Among them, in the carding process, the distance between the cotton feeding plate and the licker-in roller is 0.25mm, the five-point distances between the cylinder and the cover are: 0.23mm, 0.16mm, 0.16mm, 0.18mm, 0.20mm, the distance between the cylinder and the rear fixed cover from bottom to top is: 0.38mm, 0.31mm, 0.28mm, the distance between the cylinder and the front fixed cover from top to bottom is: 0.20mm, 0.18mm, 0.15mm, 0.16mm, the distance between the cylinder and the doffer is 0.09mm; In the drawing process, four-roller double-zone drafting is adopted, the number of combined strands in the first drawing is 6, the drafting multiple is 5.5 times, the number of combined strands in the second drawing is 8, and the drafting multiple is 7.5 times; In the roving process, the total drafting multiple is 4.5 times, the drafting multiple in the back zone is 1.10 times, and the twist is 2 twists / 10cm; S2. The electrospun composite fiber bundle prepared in Example 1 is placed on the roving frame of the roving frame of the ordinary spinning frame, and the regenerated cotton staple roving is placed below. The regenerated cotton staple roving is fed through the bell mouth of the traverse device and then passed through the drafting device. The total drafting multiple is 30 times, the drafting multiple in the rear zone is 1.25 times, and the twist is 110 twists / 10cm. After the electrospun composite fiber bundle is drawn out, it is not passed through the drafting device, but is directly introduced into the collector on the rear side of the front roller roller to be combined with the regenerated cotton staple roving after drafting, and twisted and spun into core-spun yarn, wherein the core material is regenerated staple coarse sand, the coating material is the electrospun composite fiber bundle, the weight percentage of the core material and the coating material is 45:38, and the core-spun yarn with a linear density of 18.2tex is obtained; S3. The core-spun yarn prepared in step S2 is woven into a plain weave fabric with a warp density of 320 strands / 10cm, a longitudinal density of 275 strands / 10cm, and a fabric weight of 139g / m 2 , thickness is 0.56mm.

[0029] Performance Testing: Thermal insulation test Refer to GB / T 11048-2008 "Determination of thermal resistance and moisture resistance of textiles under steady-state conditions of physiological comfort" to determine the heat transfer coefficient and thermal resistance of fabrics; Refer to GB / T 12704.1-2009 "Test method for water vapor permeability of textile fabrics - Part 1: Moisture absorption method" to conduct water vapor permeability test and calculate the water vapor permeability of fabrics;

[0030] It can be seen from Examples 5-6 and Comparative Examples 1-3 that the composition of the core-spun yarn has a significant effect on the heat transfer coefficient, thermal resistance and moisture permeability. The electrospun composite fiber bundle also contains crushed and surface-carbonized coffee powder, which is beneficial to improving the thermal insulation performance and moisture conduction effect of the fabric, so that the fabric has good thermal and moisture comfort. In addition, the far-infrared ceramic powder has a certain synergistic thermal insulation effect with the coffee powder.

[0031] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for preparing woven fabrics using recycled fibers, characterized in that: The following steps are involved: S1. The waste cotton woven fabric is opened to obtain recycled cotton fibers with a length of 25-40 mm, and the regenerated cotton fibers are carded, drawn and roved to obtain regenerated cotton staple rovings; Among them, in the carding process, the distance between the cotton feeding plate and the licker-in roller is 0.25-0.35mm, the five-point distance between the cylinder and the cover plate is: 0.23-0.26mm, 0.16-0.23mm, 0.16-0.20mm, 0.18-0.20mm, 0.20-0.23mm, the distance between the cylinder and the rear fixed cover plate from bottom to top is: 0.38-0.55mm, 0.31-0.40mm, 0.28-0.40mm, the distance between the cylinder and the front fixed cover plate from top to bottom is: 0.20-0.26mm, 0.18-0.23mm, 0.15-0.20mm, 0.16-0.20mm, the distance between the cylinder and the doffer is 0.09-0.12mm; In the drawing process, four-roller double-zone drafting is adopted, the number of combined strands in the first drawing is 6, the drafting multiple is 5.5-6 times, the number of combined strands in the second drawing is 8, and the drafting multiple is 7.5-8 times; In the roving process, the total drafting multiple is 4.1-4.5 times, the drafting multiple in the back zone is 1.10-1.30 times, and the twist is 2-4 twists / 10cm; S2. The electrospun composite fiber bundle is discharged on the roving frame on the roving frame of the ordinary spinning frame, and the regenerated cotton staple roving is discharged below. The regenerated cotton staple roving is fed through the bell mouth of the traverse device and then through the drafting device. The total drafting multiple is 30-45 times, the drafting multiple in the rear zone is 1.25-1.42 times, and the twist is 110-120 twists / 10cm. After the electrospun composite fiber bundle is drawn out, it is not passed through the drafting device, but is directly introduced into the collector on the rear side of the front roller roller and combined with the regenerated cotton staple roving after drafting, twisted and spun into a core-spun yarn, wherein the core material is the regenerated staple roving, the coating material is the electrospun composite fiber bundle, and the weight percentage of the core material and the coating material is 40-50:35-48, to obtain a core-spun yarn with a linear density of 17.5-26.2tex; S3. The core-spun yarn prepared in step S2 is woven into a plain weave fabric with a warp density of 310-330 strands / 10cm, a longitudinal density of 260-280 strands / 10cm, a fabric weight of 130-142g / m2, and a thickness of 0.55-0.58mm.

2. The method for preparing woven fabrics using recycled fibers according to claim 1, characterized in that: The preparation method of the electrospun composite fiber bundle comprises the following steps: S11. The waste coffee grounds were soaked in boiling water, then washed with deionized water until the deionized water was colorless, filtered and dried in an oven, and the dried coffee grounds were steam exploded, the steam pressure was set to 0.2-0.5Mpa, and the pressure maintenance time was 150-250s; S12. The coffee grounds pretreated by steam explosion were crushed through a 300-500 mesh sieve, first crushed by a jet mill, the crushing pressure was 1.20-1.45 MPa, the grinding time was 20-50 min, and then placed in a nano ball mill for dry grinding for 2-8h, zirconia balls were used as grinding media, and the ball-to-material volume ratio was 3:1 to obtain coffee powder; S13. The coffee powder is instantaneously surface carbonized to obtain surface carbonized coffee powder; S14 with a concentration of 8% LiCl / DMAc solvent system to dissolve bamboo pulp, and thereto was added a certain amount of coffee powder, the mass fraction of bamboo cellulose were formulated into 3.5-5wt% spinning solution; S15. PAN was dissolved in a 8% LiCl / DMAc solvent system, and a certain amount of nano far-infrared ceramic powder was added thereto to form a spinning solution having a mass fraction of PAN of 11.5-15.6wt%; S16. The fibers formed by electrospinning were deposited in a coagulation bath using a double-needle electrospinning technique, and the cellulose was collected by guiding and drawn to obtain an electrospun composite fiber bundle.

3. The method for preparing woven fabrics using recycled fibers according to claim 2, characterized in that: In step S13, the instantaneous carbonization temperature is 600-800° C. and the time is 10-30 seconds.

4. The method for preparing woven fabrics using recycled fibers according to claim 2, characterized in that: In the step S14, the mass fraction of the coffee powder added to the spinning solution is 0.2-0.5wt%.

5. The method for preparing woven fabrics using recycled fibers according to claim 2, characterized in that: In the step S15, the nano far-infrared ceramic powder is ZrC.

6. The method for preparing woven fabrics using recycled fibers according to claim 5, characterized in that: In the step S15, the mass fraction of ZrC added to the spinning solution is 0.8-1.5wt%.

7. The method for preparing woven fabrics using recycled fibers according to claim 2, characterized in that: In the step S16, the spinning voltage is 20-25 kV, the needle spinning solution flow rate is 0.1 mL / h, the distance between the needle tip and the coagulation bath is 50-80 mm, and the drafting multiple is 1.2-1.5 times.

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