Wool-like loop aggregation-state textured yarn and preparation method thereof

Abstract

The invention belongs to the technical field of filament preparation, and relates to wool-like loop aggregation-state textured yarn and a preparation method thereof. The textured yarn is composed of a core yarn and an outer wrapping yarn spirally wound on the core yarn, the outer wrapping yarn is a multifilament, velvet is evenly distributed on the surface of the multifilament, and the velvet is intertwined and curled to form a yarn loop; the preparation method comprises the following steps: feeding the multifilament into a false twisting device for false twisting and splitting, then feeding the multifilament into an air texturing device for texturing, so that loops are formed among velvet to obtain the outer covering filament, and then winding the outer covering filament on the core filament to obtain the wool-like loop aggregation textured filament. According to the preparation method of the textured yarn, the twisting procedure is omitted, the looping process is simplified, and the prepared textured yarn is three-dimensional and plump in yarn loop and stable in structure; when the textured yarn is used for weaving, the yarn loops cannot slip in the weaving process, the prepared fabric is good in size stability, elasticity and drapability, and the looped piles are not prone to falling off in the washing and friction process.

Description

Technical Field

[0001] The invention belongs to the technical field of filament preparation, and particularly relates to a wool-like loop aggregated deformed yarn and a preparation method thereof. Background Art

[0002] As consumers' requirements for clothing quality continue to increase, terry fabrics have occupied an important position in the market with their unique warmth retention, comfort and durability. However, traditional terry fabrics still have certain limitations in production technology, cost control, environmental performance, etc. Therefore, the research and development of new terry fabrics is particularly important.

[0003] Patent CN102071517A discloses a new type of terry fabric and a method for producing the new type of terry fabric. The fabric is a single-sided or double-sided terry fabric, and the terry includes an outer layer of terry and an inner layer of terry. The terry fabric uses natural fiber and ultrafine fiber as the terry raw material, chemical fiber filament or natural fiber as the base tissue raw material, and is warped and woven into a grey cloth, and then the grey cloth is post-processed to obtain the new type of terry fabric. This method combines the characteristics and functional advantages of natural fiber and ultrafine fiber, and has better fluffiness than pure natural terry (velvet) fabric. However, since this method needs to add cotton / linen loop yarn to the wool-type tissue during the weaving process, this will cause the loop structure to be unstable and easily slipped by external force. The loop of the obtained fabric is easy to fall off during the friction process, resulting in a lack of loop coverage on the fabric.

[0004] In order to solve the above problems, the prior art proposes a new method for preparing terry fabrics. After the multifilament passes through the gear body component of the air deformation device, all the single filaments in the multifilament participate in the deformation. Under a higher air pressure, these single filaments are arched and entangled into loops to form a multifilament structure with loops (such as Figure 6 As shown in the figure, the multifilament with loops is processed into terry fabric through a weaving process. This method greatly improves the production efficiency. However, although the higher air pressure ensures the stability of the loops, it reduces the uniformity of the loop size. The apparent evenness CV value of the multifilament with loops is relatively high (more than 6%). Reference 1 (Study on the uniformity of apparent evenness and quality evenness of textured yarn [J]. Journal of Textile Research, 2009, 30(4):37-40.) and Reference 2 (Study on the quality of air textured yarn loops and fabric style. Cotton Imitation Technology, 1990, 18(9): 19-21.) also studied this phenomenon. The high apparent evenness CV value of the multifilament with loops will make the loop uniformity of the final woven fabric insufficient, affecting the overall quality and appearance of the fabric.

[0005] Therefore, it is of great significance to develop a multifilament with a low apparent evenness CV value and a preparation method thereof. Summary of the invention

[0006] The present invention aims to solve the technical problems existing in the prior art and provides a wool-like loop aggregated textured yarn (i.e. a multifilament with loops having a low apparent evenness CV value) and a preparation method thereof.

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

[0008] The utility model discloses a wool-like loop-aggregated deformed yarn, which consists of a core yarn and a sheath yarn spirally wound thereon, wherein the sheath yarn is a multifilament, velvet is evenly distributed on the surface of the multifilament, and the velvets are mutually intertwined and curled to form a yarn loop.

[0009] As the preferred technical solution:

[0010] The wool-like loop-aggregated textured yarn as described above has a linear density of 22-44 dtex, a breaking strength ≥3.6 cN / dtex, an elongation at break of 23-28%, an elongation at break CV value ≤8%, a boiling water shrinkage ≤1.5%, an apparent yarn CV value ≤2.5%, a loop height of 105-115 μm, and the fabric is plump and elastic; the satin fabric made of the wool-like loop-aggregated textured yarn has an elastic recovery rate ≥85% and a drape coefficient of 35-45%.

[0011] The present invention also provides a method for preparing a wool-like yarn in a gathered state as described in any one of the above items, wherein the outer covering yarn is spirally wound on the core yarn to obtain the wool-like yarn in a gathered state;

[0012] The preparation process of the outer covering yarn is as follows: the multifilament is sent into the false twisting device for false twisting and fiber opening, so that the velvet is evenly distributed 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 that, the multifilament is sent to the air deformation device through the second feeding roller for deformation (the shape change of the multifilament before and after entering the air deformation device is shown in Figure 4 As shown in the figure), the velvets are intertwined and curled to form silk loops, thus obtaining the outer covering silk;

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

[0014] The present invention is different from the prior art in that: ① before the multifilament is fed into the air deformation device, the multifilament is first fed into the false twisting device for false twisting and fiber opening, so that velvet evenly distributed is formed on the surface of the multifilament; ② in the air deformation device, the air pressure is relatively low. In this way, before the multifilament is fed into the air deformation device, velvet is distributed on the surface of the multifilament, and the other parts of the multifilament have a certain cohesive force. After the multifilament is fed into the air deformation device, under relatively low air pressure, the velvet on the surface of the multifilament forms a silk loop after passing through the gear body component, and the other parts of the multifilament do not form a silk loop. Since only the velvet in the multifilament forms a silk loop, and the other parts do not form a silk loop, the uniformity of the silk loop mainly depends on the uniformity of the velvet. Since the velvet is evenly distributed on the surface of the multifilament, the uniformity of the silk loop is relatively high, and the apparent yarn CV value of the multifilament with the silk loop is relatively low.

[0015] As the preferred technical solution:

[0016] According to the method described above, the core yarn is a polyester shaped shrinkage yarn with a linear density of 11-22dtex and a single yarn linear density of 1-2.5dtex. The higher the single yarn linear density of the core yarn, the greater the bending stiffness, and the better the body of the fabric is, and the fabric has good drape and stiffness. The multifilament is a polyester multifilament with a linear density of 11-22dtex and a single yarn linear density of ≤0.4dtex. The smaller the single yarn fineness of the multifilament, the smaller the bending stiffness of the multifilament, and the fabric is delicate and soft.

[0017] In the method described above, the speed of the second wire feeding roller is 450-650 m / min.

[0018] In the method described above, the false twisting device is a friction disc type false twister, and its working disc includes an introduction disc, a friction disc and an output disc, which are arranged in a 2-2-2 manner;

[0019] The friction disc is a polyurethane disc with a Shore hardness of 92. The friction coefficient between the friction discs is ≥0.7, and the slip coefficient between the multifilament and the friction disc is ≤3%. The lead-out disc is made of corundum with a surface roughness of 0.5-0.7μm, which plays the role of untwisting, leading out the multifilament and opening the multifilament at the same time, so that the outer layer of the multifilament in the spiral fluffy state forms a uniform velvet distribution, and the yarn has better fluffy performance and elasticity.

[0020] The speed ratio of the false twist device is 1.85-2.05. The speed ratio of the false twist device refers to the ratio of the surface speed of the friction disk to the speed of the yarn leaving the false twist device.

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

[0022] In the method described above, in the air texturing device, the nozzle overfeed rate is 12%-18%, the humidification method is wet air humidification, and the humidification temperature is 15-20°C; the ratio of the tension of the multifilament when leaving the nozzle to the tension of the multifilament when entering the nozzle is 0.85-1.0.

[0023] According to the method described above, the multifilament is further heat treated before being fed into the false twisting device; the heat treatment temperature is 200-215°C, the deformation temperature increases, the fiber shaping increases, it is easy to deform, the hand feel and fluffiness are improved, but the deformation temperature is too high, the amorphous zone deorients, the multifilament is oxidized and adhered, and the strength of the multifilament decreases; the mechanical strength and fluffiness of the multifilament are good, and the optimal temperature is 200-215°C.

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

[0025] The method described above is achieved by spirally winding the outer covering wire on the core wire and using a network deformation device to perform network deformation; 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 the network deformation, the residual twist of the multifilament is zero, and the morphological changes of the outer covering wire and the core wire before and after entering the network deformation device are as shown in FIG. Figure 5 shown.

[0026] According to the method described above, the outer covering wire is spirally wound on the core wire and then subjected to heat setting treatment;

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

[0028] The higher the setting overfeed rate, the closer the textured yarn is to heat setting in a relaxed state. When the setting overfeed rate is 6.5%-8.5%, the terry aggregation state is stable, achieving a draped wool style, eliminating the post-spinning steaming yarn setting process and shortening the process flow.

[0029] The higher the setting temperature, the more conducive it is to the relaxation and setting of the yarn, the lower the residual stress inside the fiber, the shorter the contraction length of the shaped yarn, the denser the loops, the loops are tightly and evenly distributed on the outer layer of the shaped yarn, forming a skin-core structure aggregation state, adjusting the microstructure of the fiber to obtain dimensionally stable deformed yarn, and optimizing the three-dimensional morphology of the loops. However, too high a setting temperature is not conducive to the stability of the structure. The present invention adopts a setting temperature of 170-190°C, has good structural morphology and dimensional stability, improves the unwinding performance in post-processing, and does not require sizing when used for warp yarn.

[0030] Beneficial effects:

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

[0032] (2) The wool-like yarn with aggregated loops prepared by the method for preparing the wool-like yarn with aggregated loops of the present invention has a loop height of 105-115 μm, an apparent yarn evenness CV value of ≤2.5%, and small loops with full three-dimensional shape;

[0033] (3) The wool-like wool-loop aggregated textured yarn prepared by the method for preparing the wool-like wool-loop aggregated textured yarn of the present invention has a stable wool-loop structure, good wool-loop coverage, is not easy to deform, does not slip during the weaving process, and does not fall off during washing and friction;

[0034] (4) The wool-like ... BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The present invention is a process flow chart for preparing wool-like loop aggregated textured yarn;

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

[0037] Figure 3 Schematic diagram of the morphological changes of the multifilament before and after entering the false twisting device in the present 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 Schematic diagram of the shape change of the multifilament before and after entering the air deformation device in the present invention; in the figure, (a) is the shape of the multifilament before entering the air deformation device, and (b) is the shape of the multifilament after entering the air deformation device;

[0039] Figure 5 Schematic diagram of the shape change of the outer covering wire and the core wire before and after entering the network deformation device in the present invention; in the figure, (a) is the shape of the outer covering wire and the core wire before entering the network deformation device, and (b) is the shape of the outer covering wire and the core wire after entering the network deformation device;

[0040] Figure 6 It is a schematic diagram of preparing multifilament with wire loops in the prior art;

[0041] Among them, 1.1 multifilament, 1.2 core yarn, 2-first feeding roller, 3-deformation hot 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-introduction disk, 15-friction disk, 16-export disk. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0043] The test methods of the relevant indicators in the embodiment are as follows:

[0044] Residual twist: tested in accordance with standard GB / T2543.1-2015;

[0045] Linear density, breaking strength, breaking elongation, breaking elongation CV value: tested with reference to standard FZ / T54018-2009;

[0046] Apparent evenness CV value: Use CT3000 evenness test analyzer for testing, the instrument running speed is 350m / min, the testing time is 1min, the number of samples is 10, each sample is tested 15 times, the computer directly outputs the unevenness rate, and the average is taken to get the apparent evenness CV value;

[0047] Loop height: Connect the digital microscope to the computer and adjust it to the appropriate magnification. The number of sample yarns is 10. Each sample yarn is naturally stretched on the black velvet board. Each sample yarn is tested 5 times, each time with a length of 6mm. Through data output, record the highest loop height and take the average value;

[0048] Boiling water shrinkage: Tested in accordance with standard GB / T6505-86;

[0049] Elastic recovery rate: tested in accordance with standard FZ / T01034-2008;

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

[0051] The device for preparing the wool-like loop aggregated textured yarn in the embodiment is as follows: Figure 1As shown, it includes a first feeding roller 2, a deformation hot 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 network deformation device 9, a shaping device 10, a shaping feeding roller 11, an oiling device 12, and a winding and forming device 13;

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

[0053] The air deformation device 7 adopts a Heiberling A series nozzle, which is used to deform the velvet after forming uniform distribution on the surface of the multifilament, so that the velvet is intertwined and curled to form a wire loop to obtain the outer covering wire;

[0054] The network deformation device 9 adopts a Hybring P series nozzle for wrapping the outer covering wire made from the multifilament 1.1 onto the core wire 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 of 1.25:1. During the preparation of the fabrics, the shrinkage and shaping temperature is 195°C.

[0056] Example 1

[0057] A method for preparing a wool-like yarn in an aggregated state, the specific process is as follows:

[0058] (1) Raw material preparation:

[0059] Core yarn: polyester special-shaped shrink yarn, linear density is 11dtex, single yarn linear density is 2.5dtex, boiling water shrinkage is 10.15%;

[0060] Multifilament: Polyester multifilament, linear density is 11dtex, single yarn linear density is 0.38dtex, boiling water shrinkage is 49.5%;

[0061] (2) Preparation of outer covering wire:

[0062] First, a non-contact electric heating device was used to heat treat the multifilament. The heat treatment temperature was 212°C. The length of the electric heating device along the wire running direction was 1m. The wire running speed was 450m / min, and the stretching ratio was 1.65.

[0063] Then, the multifilament is sent to the false twisting device for false twisting and fiber opening, so that velvet is evenly distributed on the surface of the multifilament. After the false twisting device, the residual twist of the multifilament is 45 pieces / meter; wherein, the friction coefficient between the friction disks of the false twisting device is 0.75, the slip coefficient between the multifilament and the friction disk is 2.8%, the surface roughness of the lead-out disk is 0.7μm, and the speed ratio of the false twisting device is 1.90;

[0064] Finally, the multifilaments are fed into the air texturing device through the second wire feeding roller for deformation, so that the velvets are intertwined and curled to form wire loops, that is, the outer covering wire; wherein, the speed of the second wire feeding roller is 550m / min, in the air texturing device, the nozzle overfeed rate is 15%, the air pressure is 6bar, the moistening method is wet air moistening, and the moistening temperature is 15℃; the ratio of the tension of the multifilaments when leaving the nozzle to the tension of the multifilaments when entering the nozzle is 0.85;

[0065] (3) Wrapped core wire:

[0066] The outer covering wire is spirally wound on the core wire by means of network deformation using a network deformation device; wherein the aperture of the network deformation device is 1.1 mm; during the network deformation process, the air pressure is 0.5 bar; after the network deformation, the residual twist of the multifilament is zero;

[0067] (4) Heat setting treatment:

[0068] After heat setting treatment at 185°C for 8 seconds, the wool-like loop aggregated textured yarn was obtained; wherein, during the heat setting treatment process, the setting overfeed rate was 7%.

[0069] The finally obtained wool-like loop-aggregated deformed yarn consists of a core yarn and an outer covering yarn spirally wound thereon, the outer covering yarn is a multifilament, velvet is evenly distributed on the surface of the multifilament, and the velvets are intertwined and curled to form loops; the wool-like loop-aggregated deformed yarn has a linear density of 22 dtex, a breaking strength of 3.65 cN / dtex, an elongation at break of 24.2%, a CV value of elongation at break of 5.6%, a boiling water shrinkage of 1.23%, an apparent yarn CV value of 2.13%, and a loop height of 108 μm; the elastic recovery rate of the fabric made from the deformed yarn of this embodiment is 85%, and the drape coefficient is 35%.

[0070] Example 2

[0071] A method for preparing a wool-like yarn in an aggregated state, the specific process is as follows:

[0072] (1) Raw material preparation:

[0073] Core yarn: polyester special-shaped shrink yarn, linear density is 16.5dtex, single yarn linear density is 2dtex, boiling water shrinkage is 10.50%;

[0074] Multifilament: Polyester multifilament, linear density is 22dtex, single yarn linear density is 0.31dtex, boiling water shrinkage is 55.2%;

[0075] (2) Preparation of outer covering wire:

[0076] Firstly, a non-contact electric heating device was used to heat treat the multifilament. The heat treatment temperature was 210°C, the length of the electric heating device along the wire running direction was 1m, the wire running speed was 450m / min, and the stretching ratio was 1.85.

[0077] Then, the multifilament is sent to the false twisting device for false twisting and fiber opening, so that velvet evenly distributed is formed on the surface of the multifilament. After the false twisting device, the residual twist of the multifilament is 56 pieces / meter; wherein, the friction coefficient between the friction disks of the false twisting device is 0.8, the slip coefficient between the multifilament and the friction disk is 2.65%, the surface roughness of the lead-out disk 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 through the second wire feeding roller for deformation, so that the velvet is intertwined and curled to form wire loops, that is, the outer covering wire; wherein, the speed of the second wire feeding roller is 450m / min, in the air texturing device, the nozzle overfeed rate is 12%, the air pressure is 6bar, the moistening method is wet air moistening, and the moistening temperature is 15℃; the ratio of the tension of the multifilament when leaving the nozzle to the tension of the multifilament when entering the nozzle is 0.88;

[0079] (3) Wrapped core wire:

[0080] The outer covering wire is spirally wound on the core wire by means of network deformation using a network deformation device; wherein the aperture of the network deformation device is 1.1 mm; during the network deformation process, the air pressure is 1 bar; after the network deformation, the residual twist of the multifilament is zero;

[0081] (4) Heat setting treatment:

[0082] After heat setting treatment at 188°C for 12 seconds, the wool-like loop aggregated textured yarn was obtained; wherein, during the heat setting treatment process, the setting overfeed rate was 8%.

[0083] The finally obtained wool-like loop-aggregated deformed yarn consists of a core yarn and an outer covering yarn spirally wound thereon, the outer covering yarn is a multifilament, velvet is evenly distributed on the surface of the multifilament, and the velvets are intertwined and curled to form loops; the linear density of the wool-like loop-aggregated deformed 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 yarn CV value is 2.5%, and the loop height is 105 μm; the elastic recovery rate of the fabric made of the deformed yarn of this embodiment is 86%, and the drape coefficient is 39%.

[0084] Example 3

[0085] A method for preparing a wool-like yarn in an aggregated state, the specific process is as follows:

[0086] (1) Raw material preparation:

[0087] Core yarn: polyester special-shaped shrink yarn, linear density is 22dtex, single yarn linear density is 2.5dtex, boiling water shrinkage is 13.55%;

[0088] Multifilament: Polyester multifilament, linear density is 16dtex, single yarn linear density is 0.23dtex, boiling water shrinkage is 45.5%;

[0089] (2) Preparation of outer covering wire:

[0090] Firstly, a non-contact electric heating device was used to heat treat the multifilament. The heat treatment temperature was 200°C, the length of the electric heating device along the wire running direction was 1m, the wire running speed was 480m / min, and the stretching ratio was 1.72.

[0091] Then, the multifilament is sent to the false twisting device for false twisting and fiber opening, so that velvet is evenly distributed on the surface of the multifilament. After the false twisting device, the residual twist of the multifilament is 45 pieces / meter; wherein, the friction coefficient between the friction disks of the false twisting device is 0.85, the slip coefficient between the multifilament and the friction disk is 2.78%, the surface roughness of the lead-out disk is 0.7μm, and the speed ratio of the false twisting device is 2.05;

[0092] Finally, the multifilaments are fed into the air texturing device through the second wire feeding roller for deformation, so that the velvets are intertwined and curled to form wire loops, that is, the outer covering wire; wherein, the speed of the second wire feeding roller is 480m / min, in the air texturing device, the nozzle overfeed rate is 15%, the air pressure is 7bar, the moistening method is wet air moistening, and the moistening temperature is 20℃; the ratio of the tension of the multifilaments when leaving the nozzle to the tension of the multifilaments when entering the nozzle is 0.88;

[0093] (3) Wrapped core wire:

[0094] The outer covering wire is spirally wound on the core wire by means of network deformation using a network deformation device; wherein the aperture of the network deformation device is 1.2 mm; during the network deformation process, the air pressure is 0.8 bar; after the network deformation, the residual twist of the multifilament is zero;

[0095] (4) Heat setting treatment:

[0096] After heat setting treatment at 170°C for 5 seconds, the wool-like loop aggregated textured yarn was obtained; during the heat setting treatment, the setting overfeed rate was 6.8%.

[0097] The finally obtained wool-like loop-aggregated deformed yarn consists of a core yarn and an outer covering yarn spirally wound thereon, the outer covering yarn is a multifilament, velvet is evenly distributed on the surface of the multifilament, and the velvets are intertwined and curled to form loops; the wool-like loop-aggregated deformed yarn has a linear density of 39 dtex, a breaking strength of 4.25 cN / dtex, an elongation at break of 28%, an elongation at break CV value of 8%, a boiling water shrinkage of 1.5%, an apparent yarn CV value of 2.45%, and a loop height of 110 μm; the elastic recovery rate of the fabric made from the deformed yarn of this embodiment is 88%, and the drape coefficient is 42%.

[0098] Example 4

[0099] A method for preparing a wool-like yarn in an aggregated state, the specific process is as follows:

[0100] (1) Raw material preparation:

[0101] Core yarn: polyester special-shaped shrink yarn, linear density is 22dtex, single yarn linear density is 1dtex, boiling water shrinkage is 13.25%;

[0102] Multifilament: Polyester multifilament, linear density is 22dtex, single yarn linear density is 0.4dtex, boiling water shrinkage is 56.2%;

[0103] (2) Preparation of outer covering wire:

[0104] Firstly, a non-contact electric heating device was used to heat treat the multifilament. The heat treatment temperature was 210°C, the length of the electric heating device along the wire running direction was 1m, the wire running speed was 460m / min, and the stretching ratio was 1.75.

[0105] Then, the multifilament is sent to the false twisting device for false twisting and fiber opening, so that velvet evenly distributed is formed on the surface of the multifilament. After the false twisting device, the residual twist of the multifilament is 61 pieces / meter; wherein, the friction coefficient between the friction disks of the false twisting device is 0.7, the slip coefficient between the multifilament and the friction disk is 2.9%, the surface roughness of the lead-out disk is 0.5 μm, and the speed ratio of the false twisting device is 2;

[0106] Finally, the multifilaments are fed into the air texturing device through the second wire feeding roller for deformation, so that the velvets are intertwined and curled to form wire loops, that is, the outer covering wire; wherein, the speed of the second wire feeding roller is 460m / min, and in the air texturing device, the nozzle overfeed rate is 18%, the air pressure is 8bar, the humidification method is wet air humidification, and the humidification temperature is 15℃; the ratio of the tension of the multifilaments when leaving the nozzle to the tension of the multifilaments when entering the nozzle is 0.9;

[0107] (3) Wrapped core wire:

[0108] The outer covering wire is spirally wound on the core wire by means of network deformation using a network deformation device; wherein the aperture of the network deformation device is 0.9 mm; during the network deformation process, the air pressure is 0.9 bar; after the network deformation, the residual twist of the multifilament is zero;

[0109] (4) Heat setting treatment:

[0110] After heat setting treatment at 190°C for 15 seconds, the wool-like loop aggregated textured yarn was obtained; during the heat setting treatment, the setting overfeed rate was 8%.

[0111] The finally obtained wool-like loop-aggregated deformed yarn consists of a core yarn and an outer covering yarn spirally wound thereon, the outer covering yarn is a multifilament, velvet is evenly distributed on the surface of the multifilament, and the velvets are intertwined and curled to form loops; the wool-like loop-aggregated deformed yarn has a linear density of 44 dtex, a breaking strength of 4.28 cN / dtex, an elongation at break of 27.8%, an elongation at break CV value of 6.5%, a boiling water shrinkage of 0.95%, an apparent yarn CV value of 1.95%, and a loop height of 115 μm; the elastic recovery rate of the fabric made of the deformed yarn of this embodiment is 85%, and the drape coefficient is 45%.

[0112] Comparative Example 1

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

[0114] The apparent evenness CV value of the wool-like loop aggregated textured yarn finally obtained is 12.35%.

[0115] By comparing Example 4 with Comparative Example 1, it can be seen that the apparent yarn CV value of the wool-like silk loop aggregated deformed yarn of Comparative Example 1 is significantly higher than that of Example 4. This is because in the air deformation device of Comparative Example 1, the air pressure is too high. After the multifilament is fed into the air deformation device, not only the velvet forms silk loops, but other parts also form silk loops, and the uniformity of the silk loops is difficult to ensure.

[0116] Example 5

[0117] A method for preparing a wool-like yarn in an aggregated state, the specific process is as follows:

[0118] (1) Raw material preparation:

[0119] Core yarn: polyester special-shaped shrink yarn, linear density is 22dtex, single yarn linear density is 2.5dtex, boiling water shrinkage is 11.32%;

[0120] Multifilament: Polyester multifilament, linear density is 22dtex, single yarn linear density is 0.23dtex, boiling water shrinkage is 52.3%;

[0121] (2) Preparation of outer covering wire:

[0122] Firstly, a non-contact electric heating device was used to heat treat the multifilament. The heat treatment temperature was 215°C, the length of the electric heating device along the wire running direction was 1m, the wire running speed was 500m / min, and the stretching ratio was 1.68.

[0123] Then, the multifilament is sent to the false twisting device for false twisting and fiber opening, so that velvet is evenly distributed on the surface of the multifilament. After the false twisting device, the residual twist of the multifilament is 58 pieces / meter; wherein, the friction coefficient between the friction disks of the false twisting device is 0.9, the slip coefficient between the multifilament and the friction disk is 3%, the surface roughness of the lead-out disk 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 through the second wire feeding roller for deformation, so that the velvet is intertwined and curled to form wire loops, that is, the outer covering wire is obtained; wherein, the speed of the second wire feeding roller is 500m / min, and in the air texturing device, the nozzle overfeed rate is 12%, the air pressure is 7bar, the moistening method is wet air moistening, and the moistening temperature is 15℃; the ratio of the tension of the multifilament when leaving the nozzle to the tension of the multifilament when entering the nozzle is 0.85;

[0125] (3) Wrapped core wire:

[0126] The outer covering wire is spirally wound on the core wire by means of network deformation using a network deformation device; wherein the aperture of the network deformation device is 1.1 mm; during the network deformation process, the air pressure is 0.8 bar; after the network deformation, the residual twist of the multifilament is zero;

[0127] (4) Heat setting treatment:

[0128] After heat setting treatment at 188°C for 15 seconds, the wool-like loop aggregated textured yarn was obtained; wherein, during the heat setting treatment process, the setting overfeed rate was 6.5%.

[0129] The finally obtained wool-like loop-aggregated deformed yarn consists of a core yarn and an outer covering yarn spirally wound thereon, the outer covering yarn is a multifilament, velvet is evenly distributed on the surface of the multifilament, and the velvets are intertwined and curled to form loops; the wool-like loop-aggregated deformed yarn has a linear density of 44 dtex, a breaking strength of 3.92 cN / dtex, an elongation at break of 23%, an elongation at break CV value of 4.5%, a boiling water shrinkage of 1.01%, an apparent yarn CV value of 1.95%, and a loop height of 107 μm; the elastic recovery rate of the fabric made from the deformed yarn of this embodiment is 87%, and the drape coefficient is 45%.

[0130] Example 6

[0131] A method for preparing a wool-like yarn in an aggregated state, the specific process is as follows:

[0132] (1) Raw material preparation:

[0133] Core yarn: polyester special-shaped shrink yarn, linear density is 11dtex, single yarn linear density is 1dtex, boiling water shrinkage is 12.3%;

[0134] Multifilament: Polyester multifilament, linear density is 11dtex, single yarn linear density is 0.23dtex, boiling water shrinkage is 46.2%;

[0135] (2) Preparation of outer covering wire:

[0136] Firstly, a non-contact electric heating device was used to heat treat the multifilament. The heat treatment temperature was 212°C, the length of the electric heating device along the wire running direction was 1m, the wire running speed was 520m / min, and the stretching ratio was 1.68.

[0137] Then, the multifilament is sent to the false twisting device for false twisting and fiber opening, so that velvet is evenly distributed on the surface of the multifilament. After the false twisting device, the residual twist of the multifilament is 50 pieces / meter; wherein, the friction coefficient between the friction disks of the false twisting device is 0.95, the slip coefficient between the multifilament and the friction disk is 2.8%, the surface roughness of the lead-out disk is 0.5 μm, and the speed ratio of the false twisting device is 2.01;

[0138] Finally, the multifilament is fed into the air texturing device through the second wire feeding roller for deformation, so that the velvet is intertwined and curled to form wire loops, that is, the outer covering wire; wherein, the speed of the second wire feeding roller is 650m / min, in the air texturing device, the nozzle overfeed rate is 16%, the air pressure is 6.5bar, the humidification method is wet air humidification, and the humidification temperature is 18℃; the ratio of the tension of the multifilament when leaving the nozzle to the tension of the multifilament when entering the nozzle is 1;

[0139] (3) Wrapped core wire:

[0140] The outer covering wire is spirally wound on the core wire by means of network deformation using a network deformation device; wherein the aperture of the network deformation device is 0.9 mm; during the network deformation process, the air pressure is 0.8 bar; after the network deformation, the residual twist of the multifilament is zero;

[0141] (4) Heat setting treatment:

[0142] After heat setting treatment at 175°C for 5 seconds, the wool-like loop aggregated textured yarn was obtained; wherein, during the heat setting treatment process, the setting overfeed rate was 8.5%.

[0143] The finally obtained wool-like loop-aggregated deformed yarn consists of a core yarn and an outer covering yarn spirally wound thereon, the outer covering yarn is a multifilament, velvet is evenly distributed on the surface of the multifilament, and the velvets are intertwined and curled to form loops; the linear density of the wool-like loop-aggregated deformed 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 yarn CV value is 2.2%, and the loop height is 112 μm; the elastic recovery rate of the fabric made of the deformed yarn of this embodiment is 85%, and the drape coefficient is 37%.

Claims

1. A wool-like loop-aggregated textured yarn, comprising a core yarn and an outer covering yarn spirally wound thereon, characterized in that: The outer covering wire is a multifilament, and velvet is evenly distributed on the surface of the multifilament. The velvets are intertwined and curled to form wire loops.

2. The wool-like loop aggregated textured yarn according to claim 1, characterized in that: The linear density of the wool-like loop-aggregated deformed 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%, the boiling water shrinkage is ≤1.5%, the apparent yarn CV value is ≤2.5%, and the loop height is 105-115 μm; the elastic recovery rate of the satin fabric made of the wool-like loop-aggregated deformed yarn is ≥85%, and the drape coefficient is 35-45%.

3. A method for preparing a wool-like loop aggregated textured yarn as claimed in any one of claims 1 to 2, characterized in that: The outer covering wire is spirally wound on the core wire to obtain the wool-like wire loop aggregation state deformed wire; The preparation process of the outer covering yarn is as follows: the multifilament is fed into a false twisting device (5) for false twisting and fiber opening, so that velvet is evenly distributed on the surface of the multifilament, and then fed into an air deformation device (7) through a second wire feeding roller (6) for deformation, so that the velvet is intertwined and curled to form a wire loop, thereby obtaining the outer covering yarn; In the air deformation device (7), the air pressure is 6-8 bar.

4. The method according to claim 3, characterized in that: The core yarn is a polyester special-shaped shrink yarn with a linear density of 11-22 dtex and a single yarn linear density of 1-2.5 dtex; the multifilament is a polyester multifilament with a linear density of 11-22 dtex and a single yarn linear density of ≤0.4 dtex.

5. The method according to claim 4, characterized in that The false twist device (5) is a friction disc type false twist device, and its working disc comprises an introduction disc, a friction disc and an output disc, which are arranged in a 2-2-2 manner; The friction disc is a polyurethane disc with a Shore hardness of 92. The friction coefficient between the friction discs is ≥0.7, and the slip coefficient between the multifilament and the friction disc is ≤3%. The lead-out disc is made of corundum 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 twisting device (5) acts, the residual twist of the multifilament is ≥45 twists / m.

6. The method according to claim 5, characterized in that In the air deformation device (7), the nozzle overfeed rate is 12%-18%, the humidification method is wet air humidification, and the humidification temperature is 15-20°C; the ratio of the tension of the multifilament when leaving the nozzle to the tension of the multifilament when entering the nozzle is 0.85-1.

0.

7. The method according to claim 6, characterized in that The multifilament is heat treated before being fed into the false twisting device (5); the heat treatment temperature is 200-215°C.

8. The method according to claim 7, characterized in that The heat treatment adopts a non-contact electric heating device, and the length of the electric heating device along the wire running direction is 1m.

9. The method according to claim 8, characterized in that The outer covering wire is spirally wound on the core wire and a network deformation device (9) is used to perform network deformation; 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.

10. The method according to claim 9, characterized in that After the outer sheath wire is spirally wound on the core wire, it is also subjected to heat setting treatment; during the heat setting treatment, the setting temperature is 170-190°C, and the setting overfeed rate is 6.5%-8.5%.

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