A wool-like coiled aggregate textured yarn and a method of making the same

Abstract

The present application belongs to the technical field of filament preparation, and relates to a wool-simulated loop aggregate deformed yarn and a preparation method thereof. The deformed yarn is composed of a core yarn and an outer wrapping yarn spirally wound thereon, the outer wrapping yarn is a multifilament, the multifilament has uniformly distributed velvet on the surface, the velvets are intertangled and curled to form loops, the preparation method comprises the following steps: sending the multifilament into a false twisting device to perform false twisting and fiber opening, then sending the multifilament into an air texturing device to perform texturing, so that loops are formed between the velvets, the outer wrapping yarn is obtained, and then the outer wrapping yarn is wound on the core yarn, thereby obtaining the wool-simulated loop aggregate deformed yarn. The deformed yarn preparation method of the present application omits the twisting process and simplifies the looping process, and the prepared deformed yarn has three-dimensional full loops and stable structure. When the deformed yarn of the present application is used for weaving, the loops will not slip during the weaving process, the prepared fabric has good dimensional stability, good elasticity and good drape, and the loops are not easy to fall off during washing and rubbing.

Description

Technical Field

[0001] This invention belongs to the field of filament preparation technology, specifically relating to a wool-like loop aggregated deformable filament and its preparation method. Background Technology

[0002] As consumers increasingly demand higher quality clothing, terry cloth fabrics have secured a significant position in the market due to their unique warmth, comfort, and durability. However, traditional terry cloth fabrics still face limitations in terms of production processes, cost control, and environmental performance. Therefore, developing new types of terry cloth fabrics is of paramount importance.

[0003] Patent CN102071517A discloses a novel terry fabric and a method for producing it. The fabric is a single-sided or double-sided terry fabric, with the loops consisting of an outer loop and an inner loop. The terry fabric is made by using natural fibers and microfibers as loop raw materials, and chemical fiber filaments or natural fibers as base fabric raw materials. The fabric is warped and woven into a grey fabric, which is then post-treated to obtain the novel terry fabric. This method combines the characteristics and functional advantages of both natural fibers and microfibers, resulting in better loft than pure natural terry (pile) fabric. However, because this method requires the addition of cotton / linen loop yarns to the loop structure during weaving, the loop structure becomes unstable and prone to slippage under external forces. The resulting fabric is prone to loop detachment during friction, leading to insufficient loop coverage.

[0004] To address the aforementioned problems, existing technology proposes a novel method for preparing terry cloth fabric. In this method, after passing multifilament yarn through the stop component of an air deformation device, all the monofilaments in the multifilament yarn participate in the deformation. Under high air pressure, these monofilaments arch and intertwine to form loops, creating a multifilament structure with loops (e.g., ...). Figure 6 As shown in the figure, multifilament yarn with loops is processed into terry fabric through weaving. This method greatly improves production efficiency. However, although the high air pressure ensures the stability of loop formation, it reduces the uniformity of loop size. The resulting multifilament yarn with loops has a high apparent evenness CV value (over 6%). References 1 (Study on apparent evenness and quality evenness uniformity of textured yarn [J]. Journal of Textile Research, 2009, 30(4):37-40.) and 2 (Study on the quality of loops in air-textured yarn and fabric style. Imitation Cotton Technology, 1990, 18(9): 19-21.) also studied this phenomenon. The high apparent evenness CV value of multifilament yarn with loops will result in insufficient loop uniformity in the final woven fabric, affecting the overall quality and appearance of the fabric.

[0005] Therefore, it is of great significance to develop a multifilament with loops that has a low apparent evenness CV value and its preparation method. Summary of the Invention

[0006] To address the technical problems existing in the prior art, this invention provides a wool loop aggregated deformed yarn (i.e., multifilament with loops and a low apparent evenness CV value) and its preparation method.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A type of wool loop aggregate deformable yarn consists of a core yarn and an outer sheath yarn spirally wound around it. The outer sheath yarn is a multifilament yarn, and the surface of the multifilament yarn is evenly distributed with velvet. The velvet intertwines and curls to form loops.

[0009] As a preferred technical solution:

[0010] The above-mentioned wool loop textured yarn has a linear density of 22-44 dtex, a breaking strength ≥3.6 cN / dtex, a breaking elongation of 23-28%, a breaking elongation CV value ≤8%, a boiling water shrinkage rate ≤1.5%, an apparent evenness CV value ≤2.5%, and a loop height of 105-115 μm, resulting in a full and elastic fabric. Satin fabrics made from the wool loop textured yarn have an elastic recovery rate ≥85% and a drape coefficient of 35-45%.

[0011] The present invention also provides a method for preparing a wool loop aggregated deformable yarn as described in any of the preceding claims, wherein an outer sheath yarn is spirally wound around a core yarn to obtain a wool loop aggregated deformable yarn.

[0012] The preparation process of the outer sheathed yarn is as follows: the multifilament is fed into a false twisting device for false twisting and fiber opening, so that a uniformly distributed velvet is formed on the surface of the multifilament (the morphological changes of the multifilament before and after entering the false twisting device are as follows). Figure 3 After being shown), the multifilament is fed into the air deformation device via the second feed roller for deformation (the morphological changes of the multifilament before and after entering the air deformation device are as shown). Figure 4 As shown in the figure, the velvet intertwines and curls to form loops, thus obtaining the outer wrapping silk;

[0013] In the air deformation device, the air pressure is 6-8 bar.

[0014] This invention differs from existing technologies in that: ① Before feeding the multifilament into the air-texturing device, it is first fed into a false-twisting device for false twisting and fiber opening, resulting in a uniformly distributed velvet on the surface of the multifilament; ② The air pressure in the air-texturing device is relatively low. This ensures that before the multifilament is fed into the air-texturing device, its surface is covered with velvet, and other parts of the multifilament have a certain degree of cohesion. After the multifilament is fed into the air-texturing device, under relatively low air pressure, the velvet on the surface of the multifilament forms loops after passing through the stopper component, while other parts of the multifilament do not form loops. Since only the velvet forms loops in the multifilament, and other parts do not, the loop uniformity mainly depends on the velvet uniformity. Because the velvet is evenly distributed on the surface of the multifilament, the loop uniformity is high, and the apparent evenness CV value of the multifilament with loops is low.

[0015] As a preferred technical solution:

[0016] As described above, the core yarn is polyester profiled shrink yarn with a linear density of 11-22 dtex and a monofilament linear density of 1-2.5 dtex. The higher the linear density of the core yarn monofilament, the greater the bending stiffness, resulting in a better fabric body with good drape and crispness. The multifilament is polyester multifilament with a linear density of 11-22 dtex and a monofilament linear density ≤0.4 dtex. The smaller the fineness of the multifilament monofilament, the lower the bending stiffness of the multifilament, resulting in a delicate and soft fabric.

[0017] As described above, the speed of the second feed roller is 450-650 m / min.

[0018] As described above, the false twisting device is a friction disc type false twister, whose working disc includes an inlet disc, a friction disc, and an outlet disc, arranged in a 2-2-2 configuration.

[0019] The friction disc is made of polyurethane with a Shore hardness of 92. The coefficient of friction between the friction discs is ≥0.7, and the slippage coefficient between the multifilament and the friction disc is ≤3%. The guide disc is made of diamond abrasive with a surface roughness of 0.5-0.7μm. It plays the role of untwisting, guiding the multifilament, and opening the multifilament, so that a uniform velvet distribution is formed on the outer layer of the spirally fluffy multifilament, and the filament has better fluffy performance and elasticity.

[0020] The speed ratio of the false twisting device is 1.85-2.05. The speed ratio of the false twisting device refers to the ratio of the surface speed of the friction disc to the speed at which the filament leaves the false twisting device.

[0021] After the false twisting device is applied, the residual twist of the multifilament is ≥45 twists / meter.

[0022] As described above, in the air deformation device, the nozzle overfeed rate is 12%-18%, the humidification method is humidified air, and the humidification temperature is 15-20℃; the ratio of the tension of the multifilament leaving the nozzle to the tension of the multifilament entering the nozzle is 0.85-1.0.

[0023] As described above, the multifilament is heat-treated before being fed into the false twisting device. The heat treatment temperature is 200-215℃. The deformation temperature increases, the fiber shaping increases, it is easier to deform, and the hand feel and bulkiness are improved. However, if the deformation temperature is too high, the amorphous region will disorient, the multifilament will be oxidized and stick together, and the multifilament strength will decrease. The multifilament has good mechanical strength and bulkiness, and the optimal temperature is 200-215℃.

[0024] As described above, the heat treatment uses a non-contact electric heating device (which is more conducive to reducing the tension of the multifilament compared to a contact electric heating device). The length of the electric heating device along the yarn feeding direction is 1m (the yarn path length is small, which is conducive to improving production efficiency and ensuring stable dyeing performance).

[0025] As described above, the outer sheath yarn is spirally wound onto the core yarn and then network-shaped using a network deformation device. The aperture of the network deformation device is 0.9-1.2 mm. During the network deformation process, the air pressure is 0.5-1.0 bar. After network deformation, the residual twist of the multifilament is zero. The morphological changes of the outer sheath yarn and the core yarn before and after entering the network deformation device are as follows: Figure 5 As shown.

[0026] As described above, after the outer sheath is spirally wound onto the core wire, it undergoes a heat-setting process.

[0027] During the heat setting process, the setting temperature is 170-190℃, and the overfeed rate is 6.5%-8.5%.

[0028] The higher the overfeed rate, the closer the textured yarn is to the relaxed state of heat setting. With an overfeed rate of 6.5%-8.5%, the terry loops are in a stable aggregated state, achieving a draped wool style, eliminating the need for post-spinning steaming and setting processes, and shortening the process flow.

[0029] Higher setting temperatures are more conducive to the relaxation and setting of filaments, resulting in lower residual stress inside the fibers, shorter shrinkage length of the profiled filaments, and denser formation of loops. The loops are tightly and evenly distributed on the outer layer of the profiled filaments, forming a core-sheath structure aggregation state. This adjusts the microstructure of the fibers to obtain dimensionally stable deformed filaments and optimizes the three-dimensional morphology of the loops. However, excessively high setting temperatures are not conducive to structural stability. This invention uses a setting temperature of 170-190℃, which results in good structural morphology and dimensional stability, improves unwinding performance in post-processing, and eliminates the need for sizing when used for warp yarns.

[0030] Beneficial effects:

[0031] (1) The method for preparing the wool-like loop aggregated deformed yarn of the present invention eliminates the twisting process and simplifies the loop forming process;

[0032] (2) The wool loop aggregated deformed yarn prepared by the method of the present invention has a loop height of 105-115μm, an apparent yarn CV value ≤2.5%, and small and three-dimensional loops.

[0033] (3) The fabricated yarn prepared by the method of the present invention has a stable yarn loop structure, good yarn loop coverage, is not easily deformed, the yarn loop will not slip during the weaving process, and the yarn loop will not fall off during washing and friction.

[0034] (4) The wool loop aggregated deformed yarn prepared by the preparation method of the present invention has a low boiling water shrinkage rate, stable deformed yarn structure, which is conducive to the stability of textile processing quality. The obtained fabric has good dimensional stability, good elasticity, good drape, and a shimmering effect. Attached Figure Description

[0035] Figure 1 This is a process flow diagram for preparing the wool-like loop aggregated deformable yarn in this invention;

[0036] Figure 2 This is a schematic diagram of the false twisting device in the present invention;

[0037] Figure 3 This is a schematic diagram showing the morphological changes of the multifilament before and after entering the false twisting device in this invention; in the figure, (a) is the morphology of the multifilament before entering the false twisting device, and (b) is the morphology of the multifilament after entering the false twisting device.

[0038] Figure 4 This is a schematic diagram of the morphological changes of the multifilament before and after entering the air deformation device in this invention; in the figure, (a) is the morphology of the multifilament before entering the air deformation device, and (b) is the morphology of the multifilament after entering the air deformation device.

[0039] Figure 5 This is a schematic diagram showing the morphological changes of the outer sheath filament and core filament before and after entering the network deformation device in this invention; in the figure, (a) is the morphology of the outer sheath filament and core filament before entering the network deformation device, and (b) is the morphology of the outer sheath filament and core filament after entering the network deformation device.

[0040] Figure 6 This is a schematic diagram illustrating the preparation of multifilaments with loops in the prior art;

[0041] Among them, 1.1 multifilament, 1.2 core filament, 2-first feeding roller, 3-deforming heating box, 4-cooling device, 5-false twisting device, 6-second feeding roller, 7-air deformation device, 8-air deformation feeding roller, 9-network deformation device, 10-setting device, 11-setting feeding roller, 12-oiling device, 13-winding forming device, 14-introducing plate, 15-friction plate, 16-exiting plate. Detailed Implementation

[0042] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0043] Test methods for relevant indicators in the embodiments:

[0044] Residual twist: Tested according to standard GB / T2543.1-2015;

[0045] Linear density, breaking strength, elongation at break, and elongation at break (CV) value: tested according to standard FZ / T54018-2009;

[0046] Apparent stripe uniformity CV value: The CT3000 stripe uniformity tester was used for testing. The instrument ran at a speed of 350 m / min, the testing time was 1 min, the number of samples was 10, and each sample was tested 15 times. The computer directly output the stripe unevenness rate, and the average value was taken to obtain the apparent stripe CV value.

[0047] Terry height: Connect the digital microscope to the computer and adjust it to a suitable magnification. There are 10 sample yarns. Each sample yarn is naturally stretched on the black velvet board. Each sample yarn is tested 5 times, and a 6mm length segment is tested each time. The highest terry height is recorded through data output and the average value is taken.

[0048] Boiling water shrinkage rate: Tested according to standard GB / T6505-86;

[0049] Elastic recovery rate: Tested according to standard FZ / T01034-2008;

[0050] Droop coefficient: Tested in accordance with standard GB / T23329-2009.

[0051] The apparatus used in the embodiments for preparing wool-like loop aggregated deformable filaments, such as Figure 1As shown, it includes, in sequence, a first feeding roller 2, a deformation heating box 3, a cooling device 4, a false twisting device 5, a second feeding roller 6, an air deformation device 7, an air deformation feeding roller 8, a web deformation device 9, a shaping device 10, a shaping feeding roller 11, an oiling device 12, and a winding forming device 13.

[0052] The false twisting device 5 is used to false twist and open the multifilament, so that a uniformly distributed velvet is formed on the surface of the multifilament; the false twisting device 5 is a friction disc type false twister, such as... Figure 2 As shown, its working disc includes an inlet disc 14, a friction disc 15, and an outlet disc 16, arranged in a 2-2-2 configuration; the friction disc 15 is a polyurethane disc with a Shore hardness of 92, and the outlet disc 16 is made of diamond abrasive; the speed ratio of the false twisting device 5 is 1.85-2.05.

[0053] The air deformation device 7 uses a Heblin A-series nozzle to deform the uniformly distributed velvet on the surface of the multifilament, so that the velvet intertwines and curls to form loops, thus obtaining the outer sheath yarn.

[0054] The network deformation device 9 uses a Heblin P-series nozzle to wrap the outer sheath filament made from the multifilament 1.1 around the core filament 1.2.

[0055] The fabrics in the following examples are satin fabrics with a thickness of 0.150 mm and a warp density:weft density ratio of 1.25:1. During the fabric preparation process, the shrinkage and setting temperature is 195°C.

[0056] Example 1

[0057] A method for preparing a wool-like loop aggregated deformable yarn, the specific process of which is as follows:

[0058] (1) Raw material preparation:

[0059] Core yarn: Polyester profiled shrink yarn, linear density of 11 dtex, monofilament linear density of 2.5 dtex, boiling water shrinkage rate of 10.15%;

[0060] Multifilament: Polyester multifilament, linear density of 11 dtex, monofilament linear density of 0.38 dtex, boiling water shrinkage rate of 49.5%;

[0061] (2) Preparation of outer sheathing fibers:

[0062] First, a non-contact electric heating device is used to heat treat the multifilament at a temperature of 212℃. The length of the electric heating device along the yarn feeding direction is 1m. The yarn feeding speed is 450m / min and the draw ratio is 1.65.

[0063] Then, the multifilament is fed into the false twisting device for false twisting and fiber opening, so that a uniformly distributed velvet is formed on the surface of the multifilament. After the action of the false twisting device, the residual twist of the multifilament is 45 strands / meter. The friction coefficient between the friction discs of the false twisting device is 0.75, the slippage coefficient between the multifilament and the friction disc is 2.8%, the surface roughness of the guide disc is 0.7μm, and the speed ratio of the false twisting device is 1.90.

[0064] Finally, the multifilament is fed into the air texturing device by the second feed roller for texturing, causing the filaments to intertwine and curl to form loops, thus obtaining the outer wrapped yarn. The speed of the second feed roller is 550 m / min, the nozzle overfeed rate in the air texturing device is 15%, the air pressure is 6 bar, the humidification method is humidified air, and the humidification temperature is 15°C. The ratio of the tension of the multifilament when it leaves the nozzle to the tension of the multifilament when it enters the nozzle is 0.85.

[0065] (3) Wrapping the core wire:

[0066] A web-texturing device is used to spirally wind the outer sheath yarn onto the core yarn through web-texturing. The aperture of the web-texturing device is 1.1 mm. During the web-texturing process, the air pressure is 0.5 bar. After web-texturing, the residual twist of the multifilament is zero.

[0067] (4) Heat setting treatment:

[0068] After heat setting at 185℃ for 8 seconds, a wool loop aggregated deformed yarn is obtained; during the heat setting process, the overfeed rate is 7%.

[0069] The final fabricated textured yarn in the form of a wool loop consists of a core yarn and an outer sheath yarn spirally wound around it. The outer sheath yarn is a multifilament yarn with a uniformly distributed velvet on its surface. The velvet fibers intertwine and curl to form loops. The linear density of the wool loop textured yarn is 22 dtex, the breaking strength is 3.65 cN / dtex, the breaking elongation is 24.2%, the breaking elongation CV value is 5.6%, the boiling water shrinkage is 1.23%, the apparent evenness CV value is 2.13%, and the loop height is 108 μm. The fabric made using the textured yarn of this embodiment has an elastic recovery rate of 85% and a drape factor of 35%.

[0070] Example 2

[0071] A method for preparing a wool-like loop aggregated deformable yarn, the specific process of which is as follows:

[0072] (1) Raw material preparation:

[0073] Core yarn: Polyester profiled shrink yarn, linear density of 16.5 dtex, monofilament linear density of 2 dtex, boiling water shrinkage rate of 10.50%;

[0074] Multifilament: Polyester multifilament, linear density of 22 dtex, monofilament linear density of 0.31 dtex, boiling water shrinkage rate of 55.2%;

[0075] (2) Preparation of outer sheathing fibers:

[0076] First, a non-contact electric heating device is used to heat treat the multifilament. The heat treatment temperature is 210℃, the length of the electric heating device along the yarn feeding direction is 1m, the yarn feeding speed is 450m / min, and the draw ratio is 1.85.

[0077] Then, the multifilament is fed into the false twisting device for false twisting and fiber opening, so that a uniformly distributed velvet is formed on the surface of the multifilament. After the action of the false twisting device, the residual twist of the multifilament is 56 strands / meter. The friction coefficient between the friction discs of the false twisting device is 0.8, the slippage coefficient between the multifilament and the friction disc is 2.65%, the surface roughness of the guide disc is 0.7μm, and the speed ratio of the false twisting device is 1.85.

[0078] Finally, the multifilament is fed into the air texturing device by the second feed roller for texturing, causing the filaments to intertwine and curl to form loops, thus obtaining the outer wrapped yarn. The speed of the second feed roller is 450 m / min, the nozzle overfeed rate in the air texturing device is 12%, the air pressure is 6 bar, the humidification method is humidified air, and the humidification temperature is 15°C. The ratio of the tension of the multifilament when it leaves the nozzle to the tension of the multifilament when it enters the nozzle is 0.88.

[0079] (3) Wrapping the core wire:

[0080] A network deformation device is used to spirally wind the outer sheath yarn onto the core yarn through network deformation; the aperture of the network deformation device is 1.1 mm; the air pressure during network deformation is 1 bar; after network deformation, the residual twist of the multifilament is zero.

[0081] (4) Heat setting treatment:

[0082] After heat setting at 188℃ for 12 seconds, a wool loop aggregated deformed yarn is obtained; during the heat setting process, the overfeed rate is 8%.

[0083] The final fabricated textured yarn in the form of a wool loop consists of a core yarn and an outer sheath yarn spirally wound around it. The outer sheath yarn is a multifilament yarn with a uniformly distributed velvet on its surface. The velvet fibers intertwine and curl to form loops. The linear density of the wool loop textured yarn is 39 dtex, the breaking strength is 4.25 cN / dtex, the breaking elongation is 26.5%, the breaking elongation CV value is 6.5%, the boiling water shrinkage is 1.02%, the apparent evenness CV value is 2.5%, and the loop height is 105 μm. The fabric made using the textured yarn of this embodiment has an elastic recovery rate of 86% and a drape factor of 39%.

[0084] Example 3

[0085] A method for preparing a wool-like loop aggregated deformable yarn, the specific process of which is as follows:

[0086] (1) Raw material preparation:

[0087] Core yarn: Polyester profiled shrink yarn, linear density of 22 dtex, monofilament linear density of 2.5 dtex, boiling water shrinkage rate of 13.55%;

[0088] Multifilament: Polyester multifilament, linear density of 16 dtex, monofilament linear density of 0.23 dtex, boiling water shrinkage rate of 45.5%;

[0089] (2) Preparation of outer sheathing fibers:

[0090] First, a non-contact electric heating device is used to heat treat the multifilament. The heat treatment temperature is 200℃, the length of the electric heating device along the yarn feeding direction is 1m, the yarn feeding speed is 480m / min, and the draw ratio is 1.72.

[0091] Then, the multifilament is fed into the false twisting device for false twisting and fiber opening, so that a uniformly distributed velvet is formed on the surface of the multifilament. After the action of the false twisting device, the residual twist of the multifilament is 45 strands / meter. The friction coefficient between the friction discs of the false twisting device is 0.85, the slippage coefficient between the multifilament and the friction disc is 2.78%, the surface roughness of the guide disc is 0.7μm, and the speed ratio of the false twisting device is 2.05.

[0092] Finally, the multifilament is fed into the air texturing device by the second feed roller for texturing, causing the filaments to intertwine and curl to form loops, thus obtaining the outer wrapped yarn. The speed of the second feed roller is 480 m / min, the nozzle overfeed rate in the air texturing device is 15%, the air pressure is 7 bar, the humidification method is humidified air, and the humidification temperature is 20°C. The ratio of the tension of the multifilament when it leaves the nozzle to the tension of the multifilament when it enters the nozzle is 0.88.

[0093] (3) Wrapping the core wire:

[0094] A web-texturing device is used to spirally wind the outer sheath yarn onto the core yarn through web-texturing. The aperture of the web-texturing device is 1.2 mm. During the web-texturing process, the air pressure is 0.8 bar. After web-texturing, the residual twist of the multifilament is zero.

[0095] (4) Heat setting treatment:

[0096] After heat setting at 170℃ for 5 seconds, a wool loop aggregated deformed yarn is obtained; during the heat setting process, the overfeed rate is 6.8%.

[0097] The final fabricated textured yarn in the form of a wool loop consists of a core yarn and an outer sheath yarn spirally wound around it. The outer sheath yarn is a multifilament yarn with a uniformly distributed velvet on its surface. The velvet intertwines and curls to form loops. The linear density of the wool loop textured yarn is 39 dtex, the breaking strength is 4.25 cN / dtex, the breaking elongation is 28%, the breaking elongation CV value is 8%, the boiling water shrinkage rate is 1.5%, the apparent evenness CV value is 2.45%, and the loop height is 110 μm. The fabric made from the textured yarn of this embodiment has an elastic recovery rate of 88% and a drape factor of 42%.

[0098] Example 4

[0099] A method for preparing a wool-like loop aggregated deformable yarn, the specific process of which is as follows:

[0100] (1) Raw material preparation:

[0101] Core yarn: Polyester profiled shrink yarn, linear density of 22 dtex, single filament linear density of 1 dtex, boiling water shrinkage rate of 13.25%;

[0102] Multifilament: Polyester multifilament, linear density of 22 dtex, monofilament linear density of 0.4 dtex, boiling water shrinkage rate of 56.2%;

[0103] (2) Preparation of outer sheathing fibers:

[0104] First, a non-contact electric heating device is used to heat treat the multifilament. The heat treatment temperature is 210℃, the length of the electric heating device along the yarn feeding direction is 1m, the yarn feeding speed is 460m / min, and the draw ratio is 1.75.

[0105] Then, the multifilament is fed into the false twisting device for false twisting and fiber opening, so that a uniformly distributed velvet is formed on the surface of the multifilament. After the action of the false twisting device, the residual twist of the multifilament is 61 strands / meter. The friction coefficient between the friction discs of the false twisting device is 0.7, the slippage coefficient between the multifilament and the friction disc is 2.9%, the surface roughness of the guide disc is 0.5μm, and the speed ratio of the false twisting device is 2.

[0106] Finally, the multifilament is fed into the air texturing device by the second feed roller for texturing, causing the filaments to intertwine and curl to form loops, thus obtaining the outer wrapped yarn. The speed of the second feed roller is 460 m / min, the nozzle overfeed rate in the air texturing device is 18%, the air pressure is 8 bar, the humidification method is humidified air, and the humidification temperature is 15°C. The ratio of the tension of the multifilament when it leaves the nozzle to the tension of the multifilament when it enters the nozzle is 0.9.

[0107] (3) Wrapping the core wire:

[0108] A web-texturing device is used to spirally wind the outer sheath yarn onto the core yarn through web-texturing. The aperture of the web-texturing device is 0.9 mm. During the web-texturing process, the air pressure is 0.9 bar. After web-texturing, the residual twist of the multifilament is zero.

[0109] (4) Heat setting treatment:

[0110] After heat setting at 190℃ for 15 seconds, a wool loop aggregate deformed yarn is obtained; during the heat setting process, the overfeed rate is 8%.

[0111] The final fabricated textured yarn in the form of a wool loop consists of a core yarn and an outer sheath yarn spirally wound around it. The outer sheath yarn is a multifilament yarn with a uniformly distributed velvet on its surface. The velvet intertwines and curls to form loops. The linear density of the wool loop textured yarn is 44 dtex, the breaking strength is 4.28 cN / dtex, the breaking elongation is 27.8%, the breaking elongation CV value is 6.5%, the boiling water shrinkage is 0.95%, the apparent evenness CV value is 1.95%, and the loop height is 115 μm. The fabric made from the textured yarn of this embodiment has an elastic recovery rate of 85% and a drape factor of 45%.

[0112] Comparative Example 1

[0113] A method for preparing a wool-like loop aggregate deformable yarn is basically the same as in Example 4, except that the air pressure in the air deformation device is 10 bar.

[0114] The apparent straightness CV value of the finally obtained wool loop aggregate deformed yarn is 12.35%.

[0115] Comparing Example 4 with Comparative Example 1, it can be seen that the apparent evenness CV value of the simulated wool loop aggregate deformed yarn in Comparative Example 1 is significantly higher than that in Example 4. This is because the air pressure in the air deformation device of Comparative Example 1 is too high. After the multifilament is fed into the air deformation device, not only the velvet forms loops, but other parts also form loops, making it difficult to guarantee the uniformity of the loops.

[0116] Example 5

[0117] A method for preparing a wool-like loop aggregated deformable yarn, the specific process of which is as follows:

[0118] (1) Raw material preparation:

[0119] Core yarn: Polyester profiled shrink yarn, linear density of 22 dtex, monofilament linear density of 2.5 dtex, boiling water shrinkage rate of 11.32%;

[0120] Multifilament: Polyester multifilament, linear density of 22 dtex, monofilament linear density of 0.23 dtex, boiling water shrinkage rate of 52.3%;

[0121] (2) Preparation of outer sheathing fibers:

[0122] First, a non-contact electric heating device is used to heat treat the multifilament. The heat treatment temperature is 215℃, the length of the electric heating device along the yarn feeding direction is 1m, the yarn feeding speed is 500m / min, and the draw ratio is 1.68.

[0123] Then, the multifilament is fed into the false twisting device for false twisting and fiber opening, so that a uniformly distributed velvet is formed on the surface of the multifilament. After the action of the false twisting device, the residual twist of the multifilament is 58 strands / meter. The friction coefficient between the friction discs of the false twisting device is 0.9, the slippage coefficient between the multifilament and the friction disc is 3%, the surface roughness of the guide disc is 0.7μm, and the speed ratio of the false twisting device is 1.92.

[0124] Finally, the multifilament is fed into the air texturing device by the second feed roller for texturing, causing the filaments to intertwine and curl to form loops, thus obtaining the outer wrapped yarn. The speed of the second feed roller is 500 m / min, the nozzle overfeed rate in the air texturing device is 12%, the air pressure is 7 bar, the humidification method is humidified air, and the humidification temperature is 15°C. The ratio of the tension of the multifilament when it leaves the nozzle to the tension of the multifilament when it enters the nozzle is 0.85.

[0125] (3) Wrapping the core wire:

[0126] A network deformation device is used to spirally wind the outer sheath yarn onto the core yarn through network deformation; the aperture of the network deformation device is 1.1 mm; the air pressure during network deformation is 0.8 bar; after network deformation, the residual twist of the multifilament is zero.

[0127] (4) Heat setting treatment:

[0128] After heat setting at 188℃ for 15 seconds, a wool loop aggregated deformed yarn is obtained; during the heat setting process, the overfeed rate is 6.5%.

[0129] The final fabricated textured yarn in the form of a wool loop consists of a core yarn and an outer sheath yarn spirally wound around it. The outer sheath yarn is a multifilament yarn with a uniformly distributed velvet on its surface. The velvet intertwines and curls to form loops. The linear density of the wool loop textured yarn is 44 dtex, the breaking strength is 3.92 cN / dtex, the breaking elongation is 23%, the breaking elongation CV value is 4.5%, the boiling water shrinkage rate is 1.01%, the apparent evenness CV value is 1.95%, and the loop height is 107 μm. The fabric made using the textured yarn of this embodiment has an elastic recovery rate of 87% and a drape factor of 45%.

[0130] Example 6

[0131] A method for preparing a wool-like loop aggregated deformable yarn, the specific process of which is as follows:

[0132] (1) Raw material preparation:

[0133] Core yarn: Polyester profiled shrink yarn, linear density of 11 dtex, single filament linear density of 1 dtex, boiling water shrinkage rate of 12.3%;

[0134] Multifilament: Polyester multifilament, linear density of 11 dtex, monofilament linear density of 0.23 dtex, boiling water shrinkage rate of 46.2%;

[0135] (2) Preparation of outer sheathing fibers:

[0136] First, a non-contact electric heating device is used to heat treat the multifilament. The heat treatment temperature is 212℃, the length of the electric heating device along the yarn feeding direction is 1m, the yarn feeding speed is 520m / min, and the draw ratio is 1.68.

[0137] Then, the multifilament is fed into the false twisting device for false twisting and fiber opening, so that a uniformly distributed velvet is formed on the surface of the multifilament. After the action of the false twisting device, the residual twist of the multifilament is 50 strands / meter. The friction coefficient between the friction discs of the false twisting device is 0.95, the slippage coefficient between the multifilament and the friction disc is 2.8%, the surface roughness of the guide disc is 0.5μm, and the speed ratio of the false twisting device is 2.01.

[0138] Finally, the multifilament is fed into the air texturing device by the second feed roller for texturing, causing the filaments to intertwine and curl to form loops, thus obtaining the outer wrapped yarn. The speed of the second feed roller is 650 m / min, the nozzle overfeed rate in the air texturing device is 16%, the air pressure is 6.5 bar, the humidification method is humidified air, and the humidification temperature is 18°C. The ratio of the tension of the multifilament when it leaves the nozzle to the tension of the multifilament when it enters the nozzle is 1.

[0139] (3) Wrapping the core wire:

[0140] A web-texturing device is used to spirally wind the outer sheath yarn onto the core yarn through web-texturing. The aperture of the web-texturing device is 0.9 mm. During the web-texturing process, the air pressure is 0.8 bar. After web-texturing, the residual twist of the multifilament is zero.

[0141] (4) Heat setting treatment:

[0142] After heat setting at 175℃ for 5 seconds, a wool loop aggregated deformed yarn is obtained; during the heat setting process, the overfeed rate is 8.5%.

[0143] The final fabricated textured yarn in the form of a wool loop consists of a core yarn and an outer sheath yarn spirally wound around it. The outer sheath yarn is a multifilament yarn with a uniformly distributed velvet on its surface. The velvet fibers intertwine and curl to form loops. The linear density of the wool loop textured yarn is 22 dtex, the breaking strength is 3.6 cN / dtex, the breaking elongation is 27.5%, the breaking elongation CV value is 6.5%, the boiling water shrinkage is 1.35%, the apparent evenness CV value is 2.2%, and the loop height is 112 μm. The fabric made from the textured yarn of this embodiment has an elastic recovery rate of 85% and a drape factor of 37%.

Claims

1. A method for preparing a wool-like loop aggregated deformable yarn, characterized in that, By spirally winding the outer sheath filament onto the core filament, a wool loop aggregated deformable filament is obtained; The preparation process of the outer covering yarn is as follows: the multifilament is fed into the false twisting device (5) for false twisting and fiber opening, so that the velvet is evenly distributed on the surface of the multifilament. Then, it is fed into the air deformation device (7) through the second feeding roller (6) for deformation, so that the velvet intertwines and curls to form a loop, thus obtaining the outer covering yarn. In the air deformation device (7), the air pressure is 6-8 bar; The apparent straightness CV value of the wool loop aggregate deformable yarn is ≤2.5%, and the loop height is 105-115μm.

2. The method according to claim 1, characterized in that, The core yarn is a polyester profiled shrink yarn with a linear density of 11-22 dtex and a monofilament linear density of 1-2.5 dtex; the multifilament is a polyester multifilament with a linear density of 11-22 dtex and a monofilament linear density ≤0.4 dtex.

3. The method according to claim 2, characterized in that, The false twisting device (5) is a friction disc type false twister, whose working disc includes an inlet disc, a friction disc and an outlet disc, arranged in a 2-2-2 pattern; The friction disc is made of polyurethane with a Shore hardness of 92. The coefficient of friction between the friction discs is ≥0.7, and the slippage coefficient between the multifilament and the friction disc is ≤3%. The guide disc is made of diamond abrasive with a surface roughness of 0.5-0.7μm. The speed ratio of the false twisting device (5) is 1.85-2.05; After the false twist device (5) is applied, the residual twist of the multifilament is ≥45 twists / meter.

4. The method according to claim 3, characterized in that, In the air deformation device (7), the nozzle overfeed rate is 12%-18%, the humidification method is humid air humidification, and the humidification temperature is 15-20℃; the ratio of the tension of the multifilament leaving the nozzle to the tension of the multifilament entering the nozzle is 0.85-1.

0.

5. The method according to claim 4, characterized in that, Heat treatment is performed before feeding the multifilament into the false twisting device (5); the heat treatment temperature is 200-215℃.

6. The method according to claim 5, characterized in that, The heat treatment uses a non-contact electric heating device, which is 1m long along the wire feeding direction.

7. The method according to claim 6, characterized in that, The outer sheath is spirally wound onto the core wire and then deformed using a network deformation device (9); the aperture of the network deformation device (9) is 0.9-1.2 mm. During the network deformation process, the air pressure is 0.5-1.0 bar; after the network deformation, the residual twist of the multifilament is zero.

8. The method according to claim 7, characterized in that, After the outer sheath is spirally wound onto the core wire, it undergoes a heat setting process. During the heat setting process, the setting temperature is 170-190℃, and the overfeed rate is 6.5%-8.5%.

9. A wool-like looped deformable yarn prepared by the method described in any one of claims 1 to 8, comprising a core yarn and an outer sheath yarn spirally wound thereon, characterized in that, The outer sheath is made of multifilament, and the surface of the multifilament is evenly covered with velvet, which intertwines and curls to form loops.

10. The wool-like looped aggregate deformable yarn according to claim 9, characterized in that, The linear density of the wool loop aggregate textured yarn is 22-44 dtex, the breaking strength is ≥3.6 cN / dtex, the breaking elongation is 23-28%, the breaking elongation CV value is ≤8%, and the boiling water shrinkage is ≤1.5%. The elastic recovery rate of the satin fabric made from the wool loop aggregate textured yarn is ≥85%, and the drape coefficient is 35-45%.

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