Preparation process of machine-washable worsted wool-polyester yarn

Abstract

The invention relates to the technical field of textile, in particular to a preparation process of machine-washable worsted wool-polyester yarn, which comprises the following steps: S1, opening and snapping renewable wool treated by basolan to prepare loose fibers; s2, drawing the loose fibers and polyester to obtain mixed fiber strips; and S3, carrying out vortex spinning on the mixed fiber strip to obtain the machine-washable worsted wool-polyester yarn. After the renewable wool is combined with the vortex spinning mode, machine washable care can be achieved, and the preparation process can break through the care bottleneck of high-grade wool fabric.

Description

Technical Field

[0001] The present application relates to the field of textile technology, and in particular to a preparation process of machine-washable worsted wool-polyester yarn. Background Art

[0002] In the textile field, the yarn spun from wool tops that have been completely easy to care for is relatively affordable, easy to take care of, can be placed in a drum washing machine for machine washing and tumble drying, and is often used to make low-end and mid-range clothing; while wool tops treated with Basulan have higher fluffiness, softness, and bright colors, less fiber strength damage, and a particularly good feel. They are not easy to balloon when worn. Clothes or products made of Basulan wool are not easy to balloon, comfortable to wear, and have good whiteness. These characteristics position its products as high-end wool fabrics, and can only be dry-cleaned or carefully hand-washed to maintain its high-end feel, and daily care is very troublesome. Therefore, consumers often consider whether they can be machine washed when buying woolen clothes. However, the yarn spun from wool tops treated with Basulan by conventional spinning methods still maintains the above results, and will not change from hand washing to machine washing or machine washing plus tumble drying. In the face of this problem, it is urgent to develop a yarn preparation method that can change the care method and is a high-end fabric. Summary of the invention

[0003] In order to develop a yarn that can change the care method and is a high-end fabric, the present application provides a preparation process for machine washable worsted wool-polyester yarn.

[0004] The present application provides a preparation process for machine washable worsted wool-polyester yarn, which adopts the following technical solution: A preparation process of machine-washable worsted wool-polyester yarn comprises the following steps: S1, the Basulan treated renewable wool is opened and broken to form bulk fibers; S2, drawing the bulk fiber and polyester to obtain a mixed fiber strip; S3, vortex spinning the mixed fiber strips to obtain machine washable worsted wool-polyester yarn.

[0005] By adopting the above technical solutions, the renewable wool treated by Basulan has high gloss, excellent elasticity, will be softer and more delicate, more comfortable to wear, strong drape, good ductility, comfortable and breathable, warm in winter and cool in summer, deodorizing, UV protection and flame retardant; while polyester has the characteristics of recyclability, high strength and wear resistance, moisture absorption, breathability, quick drying, and lightness. The blended yarn of the two has the advantages of easy washing, no deformation after washing, easy drying, light and soft fabric, no need for ironing, high strength and wear resistance. Vortex spinning has the characteristics of short process, low cost, and low yarn hairiness. After the renewable wool is combined with the vortex spinning method, it can be machine washed and cared for. This preparation process can break through the care bottleneck of high-end wool fabrics.

[0006] In a specific embodiment, in S1, the renewable wool is 19.5 mic renewable sheep lino wool.

[0007] By adopting the above technical solutions, recycled Merino wool has the advantages of being soft and comfortable, warm and breathable, moisture wicking, antibacterial and odor-resistant, environmentally friendly and sustainable. More importantly, Merino wool products can be machine washed, are not easy to deform, and are easy to care for.

[0008] In a specific possible implementation manner, in S1, the length of the bulk fibers does not exceed 44 mm.

[0009] By adopting the above technical solution, the length of renewable wool is optimized and the length of polyester and wool fibers are matched, thereby further improving the fastness of the yarn and reducing the hairiness.

[0010] In a specific embodiment, in S2, the polyester is made of IPA copolyester chips and melt-spun to produce hollow fibers.

[0011] By adopting the above technical scheme, a third copolymer component with a bond structure is added to the polyester during the polymerization process, which destroys the regularity of the macromolecular chain, affects the close arrangement of the chain, makes it difficult to crystallize, increases its crystallization temperature, decreases its melting point, and improves the shrinkage rate of the fiber produced; at the same time, the hollow fiber is a fiber spun by a non-circular spinneret or a hollow spinneret, which improves the fluffiness of the polyester fiber, has the feel and performance of wool, and can reduce the amount of wool used. A certain amount of special-shaped fibers are mixed in the textile raw materials, so that there are gaps between the polyester fiber and the wool in the final fabric, which can improve the feel, gloss, moisture permeability and fluffiness of the fabric.

[0012] In a specific embodiment, the mass ratio of the bulk fiber to the polyester is (3-5):(5-7).

[0013] By adopting the above technical solution, optimizing the mass ratio of wool to polyester can achieve high polyester addition and improve the overall strength of the yarn. When the wool content is too high and the polyester content is too low, the cost will increase and the yarn strength will decrease; when the wool content is too low and the polyester content is too high, the antistatic performance will be poor.

[0014] In a specific possible implementation scheme, in S2, the drawing includes first-pass drawing, second-pass drawing and third-pass drawing, and the drafting in the rear area of ​​the first-pass drawing is 1-3 times, the drafting in the rear area of ​​the second-pass drawing is 1-2 times, and the drafting in the rear area of ​​the third-pass drawing is 1-2 times.

[0015] By adopting the above technical scheme, the three-step drawing process is conducive to achieving uniform mixing of fibers. At the same time, by optimizing the drafting multiple in the drawing process, the curled fibers in the raw strips can be eliminated, the straightening parallelism and separation of the fibers can be improved, and the merging effect between the fiber strips can be utilized to make the fibers of different properties in the fiber strips mixed with each other at a certain mixing ratio with good mixing uniformity.

[0016] In a specific implementation manner, in S3, during the vortex spinning, the main nozzle pressure is 0.5-1.0 MPa.

[0017] By adopting the above technical solution, the main nozzle pressure is a key factor affecting the yarn performance and plays a decisive role in the quality of jet vortex spinning yarn. As the pressure increases, the yarn strength begins to increase gradually, and gradually decreases after reaching a certain pressure; the yarn elongation shows a trend basically the same as the strength; while the effect of nozzle pressure on yarn CV is more complicated. Generally speaking, it first decreases and then increases rapidly with the increase of pressure. This is mainly because the jet vortex spinning system uses vortex to twist the fiber, the nozzle pressure is high, the yarn is wrapped more tightly, and the unwrapped part is reduced, so the strength increases, but when the pressure is too high, the yarn is wrapped irregularly, which makes the yarn strength and CV value decrease.

[0018] In a specific embodiment, in S3, during the vortex spinning, the spinning speed is 380-430 m / min.

[0019] By adopting the above technical scheme, as the spinning speed increases, the yarn strength decreases, but the impact is not very large, and the yarn elongation also shows a downward trend; the spinning speed begins to have a more obvious negative impact on the yarn CV value, and it also interacts with the nozzle pressure to affect the yarn evenness; at a low spinning speed, the fiber stays in the eddy current field for a long time, the transfer between fibers is more complete, the twist is large, and the wrapping is tighter, so that the yarn has higher strength and greater elongation; as the spinning speed increases, the yarn wrapped fibers decrease, and most of the wrapped fibers are in an irregularly wrapped state, which deteriorates the yarn evenness.

[0020] In a specific implementation manner, in S3, during the vortex spinning, the distance from the front roller to the spindle is 19-20 mm.

[0021] By adopting the above technical solution, the greater the distance from the front roller to the spindle, the more free-end fibers there are, the more wrapped parts there are, and the closer the yarn performance is to true twist yarn, but at the same time its ability to control the fibers decreases and the yarn performance deteriorates; the distance also affects the spinning rate, and too large a distance will lead to excessively high costs.

[0022] In a specific implementation scheme, in S3, during the vortex spinning, the temperature of the compressed air is 20-30°C, the humidity is 45-65%, and the temperature of the spinning environment is 20-30°C, and the humidity is 45-65%.

[0023] By adopting the above technical scheme, the temperature of compressed air, the temperature of spinning environment, the interaction between compressed air temperature and humidity, and the interaction between compressed air temperature and spinning environment humidity have a great influence on spinnability. Polyester fiber has poor hygroscopicity, and the fiber moisture regain does not change significantly with air humidity in a short period of time, and the fiber performance does not change much, so the air humidity has no significant effect on the spinning results; while the performance of polyester fiber changes significantly with the ambient temperature, so the ambient temperature has a significant effect on the spinning results.

[0024] When the air temperature and spinning temperature are low, the movement of fiber macromolecular segments is constrained, the fiber is rigid, the fiber wrapping is poor during twisting and wrapping, and the yarn quality is poor; when the air temperature and spinning temperature are high, the fiber flexibility increases, the yarn quality is good, and the air temperature increases, the yarn quality is stabilized.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The yarn formed by vortex spinning of renewable wool and polyester in this application is not only easy to wash, does not deform after washing, is easy to dry, is light and soft, does not need ironing, and is highly wear-resistant; at the same time, the yarn can be machine-washed and maintained, and the preparation process can break through the maintenance bottleneck of high-end wool fabrics; 2. In the present application, hollow fibers are prepared by melting IPA copolyester chips to form polyester. During the polyester polymerization process, a third copolymer component IPA having a bond structure is added to destroy the regularity of the macromolecular chain, affect the close arrangement of the chain, make it difficult to crystallize, increase the crystallization temperature, decrease the melting point, and increase the shrinkage rate of the prepared fiber; at the same time, the hollow fiber is a fiber spun by a non-circular spinneret or a hollow spinneret, which improves the fluffiness of the polyester fiber, has the feel and performance of wool, and can reduce the amount of wool used; 3. In this application, the quality of the produced yarn can be improved by optimizing the various process parameters in vortex spinning. DETAILED DESCRIPTION

[0026] The following examples further illustrate the present application in detail. Example

[0027] Example 1 This embodiment discloses a preparation process of a machine washable worsted wool-polyester yarn, and the specific process is as follows: S1, the regenerated merino wool with a fineness of 19.5 mic is passivated with DCCA additives and penetrants in a Basulan treatment machine to obtain Basulan treated wool, wherein the amount of DCCA additive is 5% of the regenerated merino wool, the pH value is 5, the water temperature is 25°C, the liquid rate is 100%, and the treatment time is 8 minutes; the Basulan treated wool is opened and stretched by an opener to prepare loose fibers with a main body length of about 38 mm; Preparation of polyester fiber: 6 kg CHDM and 3 kg EG are put into a pulping kettle, the temperature of the pulping kettle is controlled at 110 ° C, stirred for 15 minutes, and then 55 kg PTA, 2 kg IPA, 10 g thermal stabilizer (TMP) and 30 g catalyst (TPP) are added and stirred evenly to form a stable suspension; the suspension is sent to the first esterification kettle through a metering pump for esterification reaction, the temperature in the first esterification kettle is 255 ° C, the esterification pressure is normal pressure, and when the esterification rate is 85%, BHET esterification liquid is formed; the BHET esterification liquid is introduced into the second esterification kettle, 4 L of room temperature EG is added to the second esterification kettle to cool down the temperature to below 230 ° C, 10 kg SIPF is added, the feeding speed is 110 kg / min, and the temperature in the kettle is kept not lower than 210 ° C during the feeding process. Then add 3KgPEG-4000, continue to heat up, control the final temperature of diesterification reaction at 235℃, react for 1h, and introduce the material into polycondensation kettle by nitrogen pressurization after the reaction; the material first reacts at normal pressure in the polycondensation kettle, controls the internal temperature at 250℃, and reacts at normal pressure for 15min; after the normal pressure reaction, carry out low vacuum reaction, the initial pressure of low vacuum is 101Kpa, slowly reduce to 1.8Kpa according to the set program, the total control time is 50min, and the stirring speed during low vacuum process is 35rpm / min; after the low vacuum reaction, carry out high vacuum reaction, the initial pressure of high vacuum is 1.8Kpa, control the vacuum down to 50pa for 40min, and the subsequent reaction is maintained at 50pa, the final temperature of high vacuum is controlled at 273℃, and the discharge power is 25KW. Use nitrogen pressurization for underwater pelletizing, and control the pelletizing water temperature at 25℃ to obtain IPA copolyester chips; The IPA copolyester chips were melted to obtain a melt and passed through a circular spinneret, and then stretched and curled to obtain a Y-shaped cross-section polyester staple fiber with a shrinkage rate of 42.7%, wherein the spinneret specification D=0.3mm, the number of holes 1814, and the Y-shaped hole; the spinning speed was 550m / min; the stretching temperature was 60°C, the stretching ratio was 1.11×3.27, and the curling temperature was 55°C; S2, the bulk fibers and Y-shaped cross-section polyester fibers having a mass ratio of 4:6 are subjected to a carding and combing process to obtain wool tops and polyester tops respectively; the wool tops and polyester tops are subjected to a drawing process to obtain mixed tops, wherein the drawing process adopts three drawing steps, including a first drawing step, a second drawing step, and a final drawing step, wherein the first drawing step adopts 8 slivers for feeding, the second drawing step adopts a mixed top made by 6 first drawing steps for feeding, and the final drawing step adopts 6 mixed tops made by 6 second drawing steps for feeding, and the drafting in the back zone of the first drawing step, the drafting in the back zone of the second drawing step, is 1.5 times, the drafting in the back zone of the third drawing step, is 1.5 times; S3, directly feed the above mixed fiber strips into the drafting device, and use the speed difference between the leather rollers to draft them. The drafted fiber strips are output from the front roller jaws and are immediately sucked in by the negative pressure generated by the vortex in the spinning nozzle to form core fibers. When the end of the fiber leaves the front roller, it expands due to the vortex, covers the surface of the hollow nail, and rotates along the fixed hollow inner wall. As the yarn strip moves forward, the fiber end is wound around the yarn core so that the yarn acquires twist and forms yarn; the yarn then passes through the yarn cleaning device to remove yarn defects, and finally The rear yarn is wound into a cone yarn; the spinning process parameters are as follows: the spinning speed is 400m / min; the main nozzle pressure is 0.75MPa; the total draft TDR is 243; the main draft MDR is 30; the rear draft BDR is 3; the roller spacing is 41mm×45mm; the feed ratio is 0.97; the crimp ratio is 1.02; the distance from the spindle to the front roller is 19.5mm, the compressed air temperature is 22℃, the humidity is 53%, the temperature of the spinning environment is 28℃, and the humidity is 57%.

[0028] Example 2 The difference between this embodiment and embodiment 1 is that, in S1, the regenerated merino wool with a fineness of 19.5 mic is passivated with a DCCA additive and a penetrant in a Basulan processing machine to obtain Basulan treated wool, wherein the amount of DCCA additive is 5% of the regenerated merino wool, the pH value is 5, the water temperature is 25°C, the liquid carrying rate is 100%, and the processing time is 8 minutes; the Basulan treated wool is opened and broken by an opener to prepare loose fibers with a main body length of about 45 mm.

[0029] Example 3 The difference between this embodiment and embodiment 1 is that in S1, the polyester fiber is obtained by melt spinning of polyester chips.

[0030] Example 4 The difference between this embodiment and embodiment 1 is that, S2, the bulk fiber and the Y-shaped cross-section polyester fiber with a mass ratio of 3:7 are respectively subjected to a carding and combing process to obtain wool tops and polyester tops; the wool tops and polyester tops are subjected to a drawing process to obtain mixed tops, wherein the drawing process adopts three drawing steps, including a first drawing step, a second drawing step, and a final drawing step, wherein the first drawing step adopts 8 slivers for feeding, the second drawing step adopts 6 mixed slivers prepared by the first drawing step for feeding, and the final drawing step adopts 6 mixed slivers prepared by the second drawing step for feeding, and the first drawing step is drafted 3 times in the back zone, 2 times in the back zone, and 2 times in the back zone; S3, directly feed the mixed fiber strips into the drafting device, and use the speed difference between the rollers to draft them. The drafted fiber strips are output from the front roller jaws and are immediately sucked in by the negative pressure generated by the vortex in the spinning nozzle to form core fibers. When the end of the fiber leaves the front roller, it expands due to the vortex, covers the surface of the hollow nail, and rotates along the fixed hollow inner wall. As the yarn strips move forward, the fiber ends are wound around the yarn core so that the yarn acquires twist and forms yarn; the yarn then passes through the yarn clearing device to remove yarn defects. Finally, the yarn is wound into a cone; the spinning process parameters are as follows: the spinning speed is 430m / min; the main nozzle pressure is 1.0MPa; the total draft TDR is 243; the main draft MDR is 30; the back draft BDR is 3; the roller spacing is 41mm×45mm; the feed ratio is 0.97; the crimp ratio is 1.02; the distance from the spindle to the front roller is 20mm, the compressed air temperature is 30℃, the humidity is 45%, and the temperature of the spinning environment is 20℃, and the humidity is 65%.

[0031] Example 5 The difference between this embodiment and embodiment 1 is that, S2, the bulk fiber and the Y-shaped cross-section polyester fiber with a mass ratio of 5:5 are respectively subjected to a carding and combing process to obtain wool tops and polyester tops; the wool tops and polyester tops are subjected to a drawing process to obtain mixed tops, wherein the drawing process adopts three drawing steps, including a first drawing step, a second drawing step, and a final drawing step, wherein the first drawing step adopts 8 slivers for feeding, the second drawing step adopts 6 mixed slivers prepared by the first drawing step for feeding, and the final drawing step adopts 6 mixed slivers prepared by the second drawing step for feeding, and the first drawing step is drafted by 1 time in the back zone, the second drawing step is drafted by 1 time in the back zone, and the third drawing step is drafted by 1 time in the back zone; S3, directly feed the mixed fiber strips into the drafting device, and use the speed difference between the rollers to draft them. The drafted fiber strips are output from the front roller jaws and are immediately sucked in by the negative pressure generated by the vortex in the spinning nozzle to form core fibers. When the end of the fiber leaves the front roller, it expands due to the vortex, covers the surface of the hollow nail, and rotates along the fixed hollow inner wall. As the yarn strips move forward, the fiber ends are wound around the yarn core so that the yarn acquires twist and forms yarn; the yarn then passes through the yarn clearing device to remove yarn defects. Finally, the yarn is wound into a cone; the spinning process parameters are as follows: the spinning speed is 380m / min; the main nozzle pressure is 0.5MPa; the total draft TDR is 243; the main draft MDR is 30; the back draft BDR is 3; the roller spacing is 41mm×45mm; the feed ratio is 0.97; the crimp ratio is 1.02; the distance from the spindle to the front roller is 19mm, the compressed air temperature is 20℃, the humidity is 65%, and the temperature of the spinning environment is 30℃, and the humidity is 45%.

[0032] Example 6 The difference between this embodiment and embodiment 1 is that, S2, the above-mentioned bulk fibers and Y-shaped cross-section polyester fibers in a mass ratio of 2:8 are respectively subjected to a cleaning and combing process to obtain wool tops and polyester tops; the wool tops and polyester tops are subjected to a drawing process to obtain mixed tops, wherein the drawing process adopts three drawing passes, including a first drawing pass, a second drawing pass, and a last drawing pass, wherein the first drawing pass is fed with 8 slivers, the second drawing pass is fed with a mixed top made by 6 first drawing passes, and the last drawing pass is fed with 6 mixed tops made by 6 second drawing passes, the first drawing pass is drafted 1.5 times in the rear zone, the second drawing pass is drafted 1.5 times in the rear zone, and the third drawing pass is drafted 1.5 times in the rear zone.

[0033] Example 7 The difference between this embodiment and embodiment 1 is that, S2, the above-mentioned bulk fibers and Y-shaped cross-section polyester fibers in a mass ratio of 6:4 are respectively subjected to a cleaning and combing process to obtain wool tops and polyester tops; the wool tops and polyester tops are subjected to a drawing process to obtain mixed tops, wherein the drawing process adopts three drawing steps, including a first drawing step, a second drawing step, and a last drawing step, wherein the first drawing step is fed with 8 slivers, the second drawing step is fed with a mixed top made of 6 slivers made in the first drawing step, and the last drawing step is fed with 6 mixed tops made in the second drawing step, and the first drawing step is drafted 1.5 times in the back zone, 1.5 times in the second drawing step, and 1.5 times in the back zone of the third drawing step.

[0034] Example 8 The difference between this embodiment and embodiment 1 is that, S3, the mixed fiber strips are directly fed into the drawing device, and the speed difference between the leather rollers is used for drawing. The drawn fiber strips are output from the jaws of the front rollers and are immediately sucked in by the negative pressure generated by the vortex in the spinning nozzle to form core fibers. When the end of the fiber leaves the front roller, it expands due to the vortex, covers the surface of the hollow nail, and rotates along the fixed hollow inner wall. As the yarn strip moves forward, the end of the fiber is wound around the yarn core so that the yarn acquires twist and forms yarn. The yarn is then cleared. The device removes yarn defects, and finally the yarn is wound into a cone; the spinning process parameters are as follows: the spinning speed is 350m / min; the main nozzle pressure is 0.75MPa; the total draft TDR is 243; the main draft MDR is 30; the back draft BDR is 3; the roller spacing is 41mm×45mm; the feed ratio is 0.97; the crimp ratio is 1.02; the distance from the spindle to the front roller is 19.5mm, the compressed air temperature is 22℃, the humidity is 53%, the spinning environment temperature is 28℃, and the humidity is 57%.

[0035] Example 9 The difference between this embodiment and embodiment 1 is that, S3, the mixed fiber strips are directly fed into the drawing device, and the speed difference between the leather rollers is used for drawing. The drawn fiber strips are output from the jaws of the front rollers and are immediately sucked in by the negative pressure generated by the vortex in the spinning nozzle to form core fibers. When the end of the fiber leaves the front roller, it expands due to the vortex, covers the surface of the hollow nail, and rotates along the fixed hollow inner wall. As the yarn strip moves forward, the end of the fiber is wound around the yarn core so that the yarn acquires twist and forms yarn. The yarn is then cleared. The device removes yarn defects, and finally the yarn is wound into a cone; the spinning process parameters are as follows: the spinning speed is 450m / min; the main nozzle pressure is 0.75MPa; the total draft TDR is 243; the main draft MDR is 30; the back draft BDR is 3; the roller spacing is 41mm×45mm; the feed ratio is 0.97; the crimp ratio is 1.02; the distance from the spindle to the front roller is 19.5mm, the compressed air temperature is 22℃, the humidity is 53%, the spinning environment temperature is 28℃, and the humidity is 57%.

[0036] Example 10 The difference between this embodiment and embodiment 1 is that, S3, the mixed fiber strips are directly fed into the drawing device, and the speed difference between the leather rollers is used for drawing. The drawn fiber strips are output from the jaws of the front rollers and are immediately sucked in by the negative pressure generated by the vortex in the spinning nozzle to form core fibers. When the end of the fiber leaves the front roller, it expands due to the vortex, covers the surface of the hollow nail, and rotates along the fixed hollow inner wall. As the yarn strip moves forward, the end of the fiber is wound around the yarn core so that the yarn acquires twist and forms yarn. The yarn is then cleared. The device removes yarn defects, and finally the yarn is wound into a cone; the spinning process parameters are as follows: the spinning speed is 400m / min; the main nozzle pressure is 0.40MPa; the total draft TDR is 243; the main draft MDR is 30; the back draft BDR is 3; the roller spacing is 41mm×45mm; the feed ratio is 0.97; the crimp ratio is 1.02; the distance from the spindle to the front roller is 19.5mm, the compressed air temperature is 22℃, the humidity is 53%, the spinning environment temperature is 28℃, and the humidity is 57%.

[0037] Embodiment 11 The difference between this embodiment and embodiment 1 is that, S3, the mixed fiber strips are directly fed into the drawing device, and the speed difference between the leather rollers is used for drawing. The drawn fiber strips are output from the jaws of the front rollers and are immediately sucked in by the negative pressure generated by the vortex in the spinning nozzle to form core fibers. When the end of the fiber leaves the front roller, it expands due to the vortex, covers the surface of the hollow nail, and rotates along the fixed hollow inner wall. As the yarn strip moves forward, the end of the fiber is wound around the yarn core so that the yarn acquires twist and forms yarn. The yarn is then cleared. The device removes yarn defects, and finally the yarn is wound into a cone; the spinning process parameters are as follows: the spinning speed is 400m / min; the main nozzle pressure is 1.1MPa; the total draft TDR is 243; the main draft MDR is 30; the back draft BDR is 3; the roller spacing is 41mm×45mm; the feed ratio is 0.97; the crimp ratio is 1.02; the distance from the spindle to the front roller is 19.5mm, the compressed air temperature is 22℃, the humidity is 53%, the spinning environment temperature is 28℃, and the humidity is 57%.

[0038] Example 12 The difference between this embodiment and embodiment 1 is that, S3, the mixed fiber strips are directly fed into the drawing device, and the speed difference between the leather rollers is used for drawing. The drawn fiber strips are output from the front roller jaws and are immediately sucked in by the negative pressure generated by the vortex in the spinning nozzle to form core fibers. When the end of the fiber leaves the front roller, it expands due to the vortex, covers the surface of the hollow nail, and rotates along the fixed hollow inner wall. As the yarn strip moves forward, the fiber end is wound around the yarn core so that the yarn acquires twist and forms yarn. The yarn is then cleaned and The yarn device removes yarn defects, and finally the yarn is wound into a cone; the spinning process parameters are as follows: the spinning speed is 400m / min; the main nozzle pressure is 0.75MPa; the total draft TDR is 243; the main draft MDR is 30; the back draft BDR is 3; the roller spacing is 41mm×45mm; the feed ratio is 0.97; the crimp ratio is 1.02; the distance from the spindle to the front roller is 18mm, the compressed air temperature is 22℃, the humidity is 53%, the spinning environment temperature is 28℃, and the humidity is 57%.

[0039] Example 13 The difference between this embodiment and embodiment 1 is that, S3, the mixed fiber strips are directly fed into the drawing device, and the speed difference between the leather rollers is used for drawing. The drawn fiber strips are output from the front roller jaws and are immediately sucked in by the negative pressure generated by the vortex in the spinning nozzle to form core fibers. When the end of the fiber leaves the front roller, it expands due to the vortex, covers the surface of the hollow nail, and rotates along the fixed hollow inner wall. As the yarn strip moves forward, the fiber end is wound around the yarn core so that the yarn acquires twist and forms yarn. The yarn is then cleaned and The yarn device removes yarn defects, and finally the yarn is wound into a cone; the spinning process parameters are as follows: the spinning speed is 400m / min; the main nozzle pressure is 0.75MPa; the total draft TDR is 243; the main draft MDR is 30; the back draft BDR is 3; the roller spacing is 41mm×45mm; the feed ratio is 0.97; the crimp ratio is 1.02; the distance from the spindle to the front roller is 21mm, the compressed air temperature is 22℃, the humidity is 53%, the spinning environment temperature is 28℃, and the humidity is 57%.

[0040] Embodiment 14 The difference between this embodiment and embodiment 1 is that, S3, the mixed fiber strips are directly fed into the drawing device, and the speed difference between the leather rollers is used for drawing. The drawn fiber strips are output from the jaws of the front rollers and are immediately sucked in by the negative pressure generated by the vortex in the spinning nozzle to form core fibers. When the end of the fiber leaves the front roller, it expands due to the vortex, covers the surface of the hollow nail, and rotates along the fixed hollow inner wall. As the yarn strip moves forward, the end of the fiber is wound around the yarn core so that the yarn acquires twist and forms yarn. The yarn is then cleared. The device removes yarn defects, and finally the yarn is wound into a cone; the spinning process parameters are as follows: the spinning speed is 400m / min; the main nozzle pressure is 0.75MPa; the total draft TDR is 243; the main draft MDR is 30; the back draft BDR is 3; the roller spacing is 41mm×45mm; the feed ratio is 0.97; the crimp ratio is 1.02; the distance from the spindle to the front roller is 19.5mm, the compressed air temperature is 32℃, the humidity is 40%, and the temperature of the spinning environment is 32℃, and the humidity is 70%.

[0041] Embodiment 15 The difference between this embodiment and embodiment 1 is that, S3, the mixed fiber strips are directly fed into the drawing device, and the speed difference between the leather rollers is used for drawing. The drawn fiber strips are output from the jaws of the front rollers and are immediately sucked in by the negative pressure generated by the vortex in the spinning nozzle to form core fibers. When the end of the fiber leaves the front roller, it expands due to the vortex, covers the surface of the hollow nail, and rotates along the fixed hollow inner wall. As the yarn strip moves forward, the end of the fiber is wound around the yarn core so that the yarn acquires twist and forms yarn. The yarn is then cleared. The device removes yarn defects, and finally the yarn is wound into a cone; the spinning process parameters are as follows: the spinning speed is 400m / min; the main nozzle pressure is 0.75MPa; the total draft TDR is 243; the main draft MDR is 30; the back draft BDR is 3; the roller spacing is 41mm×45mm; the feed ratio is 0.97; the crimp ratio is 1.02; the distance from the spindle to the front roller is 19.5mm, the compressed air temperature is 18℃, the humidity is 70%, and the temperature of the spinning environment is 18℃, and the humidity is 40%.

[0042] Comparative Example Comparative Example 1 This comparative example discloses a preparation process of worsted wool-polyester yarn, and the specific process is as follows: S1, the regenerated merino wool with a fineness of 19.5 mic is passivated with DCCA additives and penetrants in a Basulan treatment machine to obtain Basulan treated wool, wherein the amount of DCCA additive is 5% of the regenerated merino wool, the pH value is 5, the water temperature is 25°C, the liquid rate is 100%, and the treatment time is 8 minutes; the Basulan treated wool is opened and stretched by an opener to prepare loose fibers with a main body length of about 38 mm; Preparation of polyester fiber: 6 kg CHDM and 3 kg EG are put into a pulping kettle, the temperature of the pulping kettle is controlled at 110 ° C, stirred for 15 minutes, and then 55 kg PTA, 2 kg IPA, 10 g thermal stabilizer (TMP) and 30 g catalyst (TPP) are added and stirred evenly to form a stable suspension; the suspension is sent to the first esterification kettle through a metering pump for esterification reaction, the temperature in the first esterification kettle is 255 ° C, the esterification pressure is normal pressure, and when the esterification rate is 85%, BHET esterification liquid is formed; the BHET esterification liquid is introduced into the second esterification kettle, 4 L of room temperature EG is added to the second esterification kettle to cool down the temperature to below 230 ° C, 10 kg SIPF is added, the feeding speed is 110 kg / min, and the temperature in the kettle is kept not lower than 210 ° C during the feeding process. Then add 3KgPEG-4000, continue to heat up, control the final temperature of diesterification reaction at 235℃, react for 1h, and introduce the material into polycondensation kettle by nitrogen pressurization after the reaction; the material first reacts at normal pressure in the polycondensation kettle, controls the internal temperature at 250℃, and reacts at normal pressure for 15min; after the normal pressure reaction, carry out low vacuum reaction, the initial pressure of low vacuum is 101Kpa, slowly reduce to 1.8Kpa according to the set program, the total control time is 50min, and the stirring speed during low vacuum process is 35rpm / min; after the low vacuum reaction, carry out high vacuum reaction, the initial pressure of high vacuum is 1.8Kpa, control the vacuum down to 50pa for 40min, and the subsequent reaction is maintained at 50pa, the final temperature of high vacuum is controlled at 273℃, and the discharge power is 25KW. Use nitrogen pressurization for underwater pelletizing, and control the pelletizing water temperature at 25℃ to obtain IPA copolyester chips; The IPA copolyester chips were melted to obtain a melt and passed through a circular spinneret, and then stretched and curled to obtain a Y-shaped cross-section polyester staple fiber with a shrinkage rate of 42.7%, wherein the spinneret specification D=0.3mm, the number of holes 1814, and the Y-shaped hole; the spinning speed was 550m / min; the stretching temperature was 60°C, the stretching ratio was 1.11×3.27, and the curling temperature was 55°C; S2, the bulk fibers and Y-shaped cross-section polyester fibers having a mass ratio of 4:6 are subjected to a carding and combing process to obtain wool tops and polyester tops respectively; the wool tops and polyester tops are subjected to a drawing process to obtain mixed tops, wherein the drawing process adopts three drawing steps, including a first drawing step, a second drawing step, and a final drawing step, wherein the first drawing step adopts 8 slivers for feeding, the second drawing step adopts a mixed top made by 6 first drawing steps for feeding, and the final drawing step adopts 6 mixed tops made by 6 second drawing steps for feeding, and the drafting in the back zone of the first drawing step, the drafting in the back zone of the second drawing step, is 1.5 times, the drafting in the back zone of the third drawing step, is 1.5 times; S3, the mixed fiber strips are subjected to roving, spun yarn and winding to obtain worsted yarn.

[0043] Performance Testing The yarns prepared in the embodiments and comparative examples were manufactured using a loom, and the fabric was a 2 / 1 twill weave to obtain a worsted fabric.

[0044] 1. Machine washable: The worsted fabrics prepared in each embodiment and comparative example were tested for felting shrinkage (-8%) according to the national textile FZ-T7009-2012 machine washable inspection standard. The test results are shown in Table 1.

[0045] 2. Breaking strength: Referring to the standard GB / T3916-2013, the breaking strength of the worsted wool-polyester yarns prepared in Examples 1-15 and Comparative Example 1 was tested, and the test method was A.

[0046] 3. Anti-pilling property: The worsted fabrics prepared in the embodiments and comparative examples were tested according to standard GB / T4802.3-2008 "Determination of pilling properties of textile fabrics Part 3: Pilling box method" at a temperature of 20° C. and a relative humidity of 65%.

[0047] 3. Antistatic property: The worsted fabrics prepared in the embodiments and comparative examples were tested according to the standard GB / T12703-2008 "Test of electrostatic properties of textiles - Half-life of static voltage" at a temperature of 20°C and a relative humidity of 35%.

[0048] Table 1 Performance test data of Examples 1-15 and Comparative Example 1 Referring to Table 1, in combination with Example 1 and Comparative Example 1, it can be seen that the renewable wool and polyester of the present application are vortex-spinned to produce fabrics that are machine washable compared to yarns obtained by ordinary textile processes, which reduces the trouble of care, breaks through the bottleneck that wool fabrics treated with Basolan can only be washed by hand, and realizes the application of wool fabrics treated with Basolan in the field of worsted wool yarn that can also be machine washed.

[0049] Referring to Table 1, in combination with Examples 1 and 2, it can be seen that after the length of renewable wool is optimized in the present application, the length of polyester and wool fibers is matched, thereby further improving the fastness of the yarn and reducing the hairiness, thereby improving the yarn strength and the anti-pilling shape of the fabric.

[0050] Referring to Table 1, combined with Examples 1 and 3, it can be seen that the polyester fiber used in this application adds a third copolymer component IPA with a bond structure during the polyester polymerization process, destroying the regularity of the macromolecular chain, affecting the close arrangement of the chain, making it difficult to crystallize, increasing its crystallization temperature, lowering its melting point, and improving the shrinkage rate of the fiber produced; at the same time, the hollow fiber is a fiber spun by a non-circular spinneret or a hollow spinneret, which improves the fluffiness of the polyester fiber, has the feel and performance of wool, and can reduce the amount of wool. A certain amount of special-shaped fibers are mixed in the textile raw materials, so that there are gaps between the polyester fiber and the wool in the final fabric, which can improve the feel, gloss, moisture permeability and fluffiness of the fabric.

[0051] Referring to Table 1, in combination with Examples 1, 6 and 7, it can be seen that the present application can achieve high polyester addition and improve the overall strength of the yarn by optimizing the mass ratio of wool to polyester. When the wool content is too high and the polyester content is too low, the cost increases and the yarn strength decreases; and when the wool content is too low and the polyester content is too high, the antistatic performance is poor.

[0052] Referring to Table 1, in combination with Examples 1, 8 and 9, it can be seen that during vortex spinning of the present application, as the spinning speed increases, the yarn strength decreases, but the effect is not very large, and the yarn elongation also shows a downward trend; the spinning speed begins to have a more obvious negative impact on the yarn CV value, and it also interacts with the nozzle pressure to affect the yarn evenness; at a low spinning speed, the fiber stays in the vortex field for a long time, the transfer between fibers is more sufficient, the twist is large, and the wrapping is tighter, so that the yarn has higher strength and greater elongation; as the spinning speed increases, the yarn wrapped fibers decrease, and most of the wrapped fibers are in an irregularly wrapped state, which deteriorates the yarn evenness.

[0053] Referring to Table 1, in combination with Examples 1, 10 and 11, the main nozzle pressure is a key factor affecting the yarn performance during vortex spinning in this application, and plays a decisive role in the quality of the jet vortex spinning yarn. As the pressure increases, the yarn strength begins to increase gradually, and gradually decreases after reaching a certain pressure; the yarn elongation shows a trend that is basically the same as the strength; while the effect of the nozzle pressure on the yarn CV is more complicated, and generally decreases first and then increases rapidly with the increase of pressure. This is mainly because the jet vortex spinning system uses vortex to twist the fiber, the nozzle pressure is high, the yarn is wrapped more tightly, and the unwrapped part is reduced, so the strength increases, but when the pressure is too high, the yarn shows irregular wrapping, which makes the yarn strength and CV value decrease.

[0054] Referring to Table 1, in combination with Examples 1, 12 and 13, it can be seen that, during vortex spinning in the present application, the greater the distance from the front roller to the spindle, the more free-end fibers there are, the more wrapped parts there are, and the closer the yarn performance is to true twist yarn, but at the same time its ability to control the fibers decreases and the yarn performance deteriorates; this distance also affects the spinning rate, and too large a distance will lead to excessively high costs.

[0055] Referring to Table 1, in combination with Examples 1, 14 and 15, it can be seen that during vortex spinning of the present application, the temperature of the compressed air, the temperature of the spinning environment, the interaction between the compressed air temperature and humidity, and the interaction between the compressed air temperature and the humidity of the spinning environment have a great influence on the spinnability. Polyester fiber has poor hygroscopicity, and the moisture regain of the fiber does not change significantly with the change of air humidity in a short period of time, and the fiber performance does not change much, so the air humidity has no significant effect on the spinning results; while the performance of polyester fiber changes significantly with the ambient temperature, so the ambient temperature has a significant effect on the spinning results. When the air temperature and spinning temperature are low, the movement of the fiber macromolecular segments is constrained, the fiber rigidity is large, the fiber wrapping is poor during twisting and wrapping, and the yarn quality is poor; when the air temperature and spinning temperature are high, the fiber flexibility increases, the yarn quality is good, and the air temperature rises, and the yarn quality is stabilized.

[0056] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A process for preparing machine washable worsted wool-polyester yarn, characterized in that: The following steps are involved: S1, the Basulan treated renewable wool is opened and broken to form bulk fibers; S2, drawing the bulk fiber and polyester to obtain a mixed fiber strip; S3, vortex spinning the mixed fiber strips to obtain machine washable worsted wool-polyester yarn.

2. The process for preparing a machine washable worsted wool-polyester yarn according to claim 1, characterized in that: In S1, the renewable wool is 19.5 mic renewable sheep lino wool.

3. The process for preparing a machine washable worsted wool-polyester yarn according to claim 1, characterized in that: In S1, the length of the bulk fibers does not exceed 44 mm.

4. The process for preparing a machine washable worsted wool-polyester yarn according to claim 1, characterized in that: In S2, the polyester is made of IPA copolyester chips and melt-spun to produce hollow fibers.

5. The process for preparing a machine washable worsted wool-polyester yarn according to claim 1, characterized in that: In S2, the mass ratio of the bulk fiber to the polyester is (3-5): (5-7).

6. The process for preparing a machine washable worsted wool-polyester yarn according to claim 1, characterized in that: In S2, the drawing includes first-pass drawing, second-pass drawing and third-pass drawing. The drafting in the rear area of ​​the first-pass drawing is 1-3 times, the drafting in the rear area of ​​the second-pass drawing is 1-2 times, and the drafting in the rear area of ​​the third-pass drawing is 1-2 times.

7. The process for preparing a machine washable worsted wool-polyester yarn according to claim 1, characterized in that: In S3, during the vortex spinning, the main nozzle pressure is 0.5-1.0 MPa.

8. The process for preparing a machine washable worsted wool-polyester yarn according to claim 1, characterized in that: In S3, during the vortex spinning, the spinning speed is 380-430 m / min.

9. The process for preparing a machine washable worsted wool-polyester yarn according to claim 1, characterized in that: In S3, during the vortex spinning, the distance from the front roller to the spindle is 19-20 mm.

10. The process for preparing a machine washable worsted wool-polyester yarn according to claim 1, characterized in that: In S3, during the vortex spinning, the temperature of the compressed air is 20-30°C, the humidity is 45-65%, and the temperature of the spinning environment is 20-30°C, and the humidity is 45-65%.

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