Preparation method of DTY (Draw Textured Yarn) high-fluffiness comfortable elastic spandex wrap yarn

Abstract

The invention discloses a preparation method of DTY (Draw Textured Yarn) high-fluffiness comfortable elastic spandex wrap yarn. According to the method, polyester fiber-POY pre-oriented yarn on an elasticizer raw yarn frame sequentially passes through a pre-network, a first roller, an elasticizer deformation hot box, a cooling plate, a false twister, a tension sensor, a second roller, a second hot box, a yarn guide, a third roller, an oiling device and a winding device to be wound, and then the DTY high-fluffiness comfortable elastic spandex wrap yarn is formed. The DTY high-fluffiness comfortable elastic spandex wrap yarn prepared from the POY tows is high in flatness, good in fluffiness and wear resistance, high in color fastness, high in plasticity, low in production cost and full and round in the spandex wrapping process, and the problems that a single tow protrudes and a long yarn ring is generated are solved.

Description

Technical Field

[0001] The invention relates to the technical field of polyester production, and in particular to a method for preparing a DTY high-loft and stretchable spandex coated yarn. Background Art

[0002] At present, most of the spandex covered yarns on the market are covered with nylon, and the production cost is relatively high. With the increasing demand for spandex covered yarns in the market in recent years, coupled with the inability of nylon production to supply, the supply of spandex covered yarns is tight and the cost continues to rise. In order to improve this phenomenon, it is necessary to develop new materials to replace the covered yarns to solve this problem.

[0003] Polyester fiber has the advantages of good wear resistance, high color fastness, strong plasticity and low production cost. Therefore, using polyester fiber as a coating material instead of nylon coating material can perfectly solve this problem. Existing polyester fibers mainly include DTY, POY, DT, FDY and other series. Among them, POY, DT and FDY have no elasticity, resulting in obvious gaps after coating, and cannot meet the requirements of replacement; while the DTY series of polyester fibers have good elasticity and can meet the needs of coated yarn. However, the DTY series polyester fibers produced by the current process are generally in a curled state, and the coated yarn requires a certain degree of flatness, which results in the existing DTY polyester fibers being unable to meet the demand for coated yarn raw materials. Therefore, it is necessary to improve the production process of DTY polyester fibers so that they can have sufficient flatness after molding to meet the requirements of coated yarn. Summary of the invention

[0004] In order to solve one or some technical problems existing in the prior art, the purpose of this application is to provide a method for preparing DTY high-loft and stretch spandex coated yarn, which can make the DTY high-loft and stretch spandex coated yarn prepared by POY tow have high flatness, good fluffiness and wear resistance, high color fastness, strong plasticity, low production cost, full and round during the spandex coating process, avoiding the problem of single tow protrusion and the generation of long yarn loops.

[0005] In order to solve the above existing technical problems, this application adopts the following technical solutions: A method for preparing a DTY high-loft and stretchable spandex coated yarn comprises a raw yarn frame of a texturing machine, a wire guide tube, a wire cutter, a pre-network with a network nozzle, a first roller, a texturing machine deformation hot box, a cooling plate, a false twister, a tension sensor, a second roller, a second hot box, a wire guide, a third roller, an oiling device and a winding device. The process steps of the DTY high-loft and stretchable spandex coated yarn include: S1. The polyester fiber-POY pre-oriented yarn is hung on the raw yarn rack of the texturing machine, and the POY pre-oriented yarn enters the pre-net through the yarn guide tube and the yarn cutter; S2, after passing through the network nozzle in the pre-network, enters a roller and makes the first circle; S3, then heating in the texturing machine deformation hot box H1, so that the POY pre-oriented yarn is heated to a vitrified state to facilitate deformation; S4, the POY pre-oriented yarn in the vitrified state is cooled by a cooling plate and then enters a false twister. The false twister rotates a combination of an inlet disk, a working disk, and an outlet disk to twist and untwist the yarns passing through, so that the yarn bundle becomes fluffy; S5, the yarn bundle processed by the false twister enters the second roller after passing through the tension sensor. The tension sensor detects and records the untwisting tension of the yarn bundle in real time to facilitate quality control. The untwisting tension T2 = 50-70g; S6, after the tow passes through the second roller, it directly enters the second heat box to heat-set the tow; S7, after the tow comes out of the second heat box, it changes direction through the action of the yarn guide, and then enters the three rollers to form a relaxed state, which is conducive to heat setting in the second heat box H2; S8, the tow enters the refueling device after passing through the three rollers. After being refueled by the tanker, the tow enters the winding device for winding and forming, forming DTY high-loft and stretchy spandex coated yarn.

[0006] Preferably, the shaft speed of the first roller is 300-500m / min.

[0007] Preferably, the second shaft speed of the second roller is 600-850 m / min, and the shaft speed difference ratio between the second roller and the first roller is 1.4-1.8.

[0008] Preferably, the tow entering the three rollers passes between the leather roller and the steel rod by direct pressing, the third axis speed of the three rollers is 500-750 m / min, and the axis speed of the three rollers is slower than that of the two rollers.

[0009] Preferably, the heating temperature of the spring deformation hot box is 180-220°C.

[0010] Preferably, when the tow in step S5 enters the second roller FR 2, it is wound 2-3 times between the top roller and the guide roller, and the guide roller is arranged obliquely.

[0011] Preferably, the temperature of the second heat box is 150-200° C., and the filament bundle is heat-set in the second heat box by non-contact heating.

[0012] Preferably, the rotation speed of the oil roller of the oil tanker in step S8 is 0.2-1.2 rpc / min, and the winding speed of the winding device is 580-830 m / min.

[0013] Preferably, an anti-stuck device is provided between the first roller and the pre-network.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. It can effectively detect that when the speed of the existing three rollers is greater than that of the two rollers, the yarn will be tight and the network nozzle will not be able to spray the network point, resulting in the problem that the network yarn cannot be produced.

[0015] 2. It can solve the problem that the 36 single filaments are bound to be entangled when preparing POY pre-oriented yarn into DTY yarn in the current process, which leads to the problem that the yarn bundle is easily bulged locally after knotting, and the fiber yarn bundle after the false twister appears spirally curled.

[0016] 3. By adding a pre-network, the single fibers of the tow can run synchronously when entering the next link, without being entangled or uneven. The flatness of the tow can be adjusted so that the diameter of the tow (the length of each fiber) is consistent after passing through the pre-network, so that the yarn maintains a high degree of smoothness, and the single fibers can be transported evenly and smoothly backward after coming out of the raw yarn rack, thereby avoiding entanglement and making the final fiber straighter; this is conducive to long-term maintenance in the later stage, making the tow full and round during the spandex coating process, avoiding the protrusion of a single tow and the generation of long yarn loops. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a process flow chart of the present invention; In the figure: 1, raw yarn rack; 2, wire guide tube; 3, wire cutter; 4, pre-net; 5, anti-stiffness device; 6, first roller; 7, texturing machine deformation hot box; 8, cooling plate; 9, false twister; 10, tension sensor; 11, second roller; 12, second hot box; 13, third roller; 14, oiling device; 15, winding device; 16, wire guide; DETAILED DESCRIPTION

[0018] Below, the present application is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0019] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0020] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0021] like Figure 1 As shown, a method for preparing a DTY high-loft and stretchable spandex coated yarn comprises a texturing machine raw yarn frame 1, a wire guide tube 2, a wire cutter 3, a pre-network with a network nozzle 4, a first roller 6, a texturing machine deformation hot box 7, a cooling plate 8, a false twister 9, a tension sensor 10, a second roller 11, a second hot box 12, a wire guide 16, a third roller 13, an oiling device 14 and a winding device 15. The process steps of the DTY high-loft and stretchable spandex coated yarn include: S1, hang the polyester fiber-POY pre-oriented yarn on the raw yarn rack 1 of the texturing machine, and the POY pre-oriented yarn enters the pre-network 4 through the yarn guide tube 2 and the yarn cutter 3; S2, after passing through the network nozzle in the pre-network 4, it enters a roller 6 and makes the first circle; S3, then heating in the texturing machine deformation hot box 7H1, so that the POY pre-oriented yarn is heated to a vitrified state to facilitate deformation; S4, the POY pre-oriented yarn in the vitrified state is cooled by the cooling plate 8 and then enters the false twister 9, and the false twister 9 rotates through the combination of the introduction disk, the working disk and the outlet disk to cause the passing yarn to be twisted and untwisted, so that the yarn bundle is in a fluffy state; S5, the yarn bundle processed by the false twister 9 enters the second roller 11 after passing through the tension sensor 10. The tension sensor 10 detects and records the untwisting tension of the yarn bundle in real time for quality control. The untwisting tension T2 = 50-70g; S6, after the tow passes through the second roller 11, it directly enters the second heat box 12 to heat-set the tow; S7, after the tow comes out of the second hot box 12, it changes direction through the action of the yarn guide 16, and then enters the three rollers 13 to form a relaxed state of the tow, which is conducive to heat setting in the second hot box 12H2; S8, the tow enters the refueling device 14 after passing through the three rollers 13. After being refueled by the tanker, the tow enters the winding device 15 for winding and forming to form DTY high-loft and stretchy spandex coated yarn.

[0022] At present, the network nozzle in the conventional process is set between the second roller 11FR2 and the third roller 13FR3. The yarn between the second roller 11FR2 and the third roller 13FR3 can keep the yarn loose and tight according to the yarn style, and achieve heat setting through the temperature of the second heat box 12H2, so that the fiber after the false twister 9 becomes fluffy fiber, but it also causes the fiber to appear spiral. At the same time, there is no pre-network 4 in front of the first roller 6FR1 of the existing process, resulting in the inevitable entanglement of 36 monofilaments. After knotting, it is easy to have the problem of local protrusion of the tow, resulting in the spiral curling of the fiber tow after the false twister 9. Therefore, in order to solve the above problems, the existing equipment is improved, and the network nozzle is set before the axis of a roller 6FR1. At the same time, a pre-network 4 is added in front of the axis of a roller 6FR1. The network point is directly added to the fed POY raw yarn through the pre-network 4. After adding the pre-network 4, the single fibers of the tow are kept running synchronously when entering the next link, and they are not entangled or uneven. The flatness of the tow is adjusted so that the diameter of the tow (the length of each fiber passing) is consistent after passing through the pre-network 4, so that the yarn maintains a high degree of smoothness, and the single fibers can be evenly and smoothly transported backward after coming out of the raw yarn rack 1, thereby avoiding entanglement and making the final produced fiber straighter; then the tow is circled on the leather roller of a roller 6 and enters the first deformation heat box H1 for heating, and then is heat-set in the second heat box 12H2, thereby increasing the stability of the fluffiness of the DTY tow.

[0023] At the same time, in the process, POY is pre-networked 4 before winding, and coiled with a roller 6 to reduce slippage and the probability of undrawn yarns; at the same time, the monofilaments are kept parallel and synchronous to reduce mutual entanglement and unevenness between filaments, ensuring smoothness and achieving smoothness and high fluffiness between DTY monofilaments. Pre-networking 4 and coiling before stretching improve the bundling of the yarn and the stability of fluffiness: each fiber is loosened, reducing the "shrinking" of the yarn caused by insufficient curling due to entanglement between single fibers, and in the heat setting area, the yarn is relaxed, so that the curling state of the yarn is fully fixed, which is conducive to long-term maintenance in the later stage. In the process of covering the tow with spandex, the tow is full and round, avoiding the protrusion of a single tow and the problem of long yarn loops.

[0024] A further improvement is that the shaft speed of the roller 6 is 300-500m / min.

[0025] When the yarn bundle with network enters the first roller 6FR1, the shaft speed is 300-500m / min, and it circles at the first roller 6 to reduce slippage and the probability of undrawn yarns; at the same time, the single yarns are kept parallel and synchronous to reduce mutual entanglement and unevenness between yarns, ensuring smoothness.

[0026] A further improvement is that the second shaft speed of the second roller 11 is 600-850m / min, and the shaft speed difference ratio between the second roller 11 and the first roller 6 is 1.4-1.8.

[0027] When the speed difference ratio of the second roller 11 and the first roller 6 is lower than this range, insufficient drafting and stiff yarns will occur, which cannot meet the needs of post-processing; when it is higher than this range, more hairy yarns or broken ends will appear during processing, resulting in abnormal production.

[0028] A further improvement is that the yarn bundle entering the three rollers 13 passes between the leather roller and the steel rod by direct pressing, the third shaft speed of the three rollers 13 is 500-750m / min, and the shaft speed of the three rollers 13 is slower than that of the two rollers 11.

[0029] After the tow enters the three rollers 13FR3, it is directly pressed to pass between the leather roller and the steel rod of the three rollers 13FR3. The third axis speed of the three rollers 13 is 500-750m / min, which is slower than that of the two rollers 11FR2. The loose state of this section of yarn is maintained to ensure that the network nozzle sprays the yarn onto the network node, which is beneficial to the subsequent weaving process and the heat setting of the second hot box 12H2. If the FR3 speed is greater than the FR2 speed, the yarn will be tight and the network nozzle will not be able to spray the network point, resulting in the inability to produce network yarn.

[0030] A further improvement is that the heating temperature of the spring deformation hot box is 180-220°C.

[0031] When the elastic deformation hot box H1 heats the wire in an environment of 180-220°C, the wire can be heated to a vitrified state so as to produce better deformation stability.

[0032] A further improvement is that when the tow in step S5 enters the second roller 11FR 2, it is wound 2-3 times between the top roller and the guide roller, and the guide roller is set obliquely.

[0033] When the tow enters the two-roller 11FR 2, it is wound 2-3 times between the top roller and the godet roller. The inclination of the godet roller allows the wound to separate naturally without twisting. If there are too many turns between the top roller and the godet roller, the equipment width will be insufficient and the operation will be more difficult. If there are too few turns, there will be a risk of slipping, causing fluctuations in the draft ratio or failure to meet the process requirements when the wire is fed to the next link.

[0034] As a further improvement, the temperature of the second heat box 12 is 150-200° C., and the filament bundle is heat-set in the second heat box 12 by non-contact heating.

[0035] After passing through the second roller 11, the filament bundle directly enters the second heat box 12H2. The temperature of the second heat box 12H2 is 150-200°C. The filament bundle is heat-set by non-contact heating to make the shape of the filament bundle more stable.

[0036] Further improvement is that the rotation speed of the oil roller of the oil tanker in step S8 is 0.2-1.2 rpc / min, and the winding speed of the winding device 15 is 580-830 m / min.

[0037] After passing through the three rollers 13, the tow enters the oiling device 14, and the oil roller speed is 0.2-1.2rpc / min; after being oiled by the oil tanker, the tow enters the winding device 15 for winding and forming, and the winding speed is 580-830m / min. If there is too little oil, the tow will be tangled due to static electricity when unwinding, which is difficult to process. If there is too much oil, the oil on the silk will be scraped off during processing, splashing everywhere, making the processing environment bad and prone to oil pollution.

[0038] A further improvement is that an anti-stuck device 5 is provided between the first roller 6 and the pre-network 4.

[0039] When the tow is conveyed to the leather roller after passing through the pre-network 4, since there is no anti-stiffness device 5 between the leather roller and the first roller 6 in the existing process, the polyester fiber and the POY fiber directly enter the first roller 6FR1 from the raw wire rack 1, the wire guide tube 2, the wire cutter 3, and the network nozzle, and circle around the first roller 6 with an axis speed of 300-500m / min. The tow is heated at 180-220℃ in the first deformation heat box H1 of the texturing machine so that the filaments are heated to a vitrified state to facilitate deformation. The problem of not compacting the tow is prone to occur, resulting in a non-drafting phenomenon in production, and ultimately resulting in the tow having no elasticity. Therefore, in order to ensure stable drafting of the tow when using the first roller 6, an anti-stiffness device 5 is added between the first roller 6 and the pre-network 4.

[0040] The above-mentioned implementation modes are only preferred implementation modes of the present application and cannot be used to limit the scope of protection of the present application. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present application shall fall within the scope of protection required by the present application.

Claims

1. A method for preparing DTY high-loft and stretchable spandex coated yarn, characterized in that: The invention comprises a raw yarn frame of a texturing machine (1), a wire guide tube (2), a wire cutter (3), a pre-net with a net nozzle (4), a first roller (6), a texturing machine deformation hot box (7), a cooling plate (8), a false twister (9), a tension sensor (10), a second roller (11), a second hot box (12), a wire guide (16), a third roller (13), an oiling device (14) and a winding device (15). The process steps of the DTY high-loft and stretchable spandex coated yarn include: S1, suspending polyester fiber-POY pre-oriented yarn on the raw yarn rack (1) of the texturing machine, and the POY pre-oriented yarn enters the pre-net (4) through the yarn guide tube (2) and the yarn cutter (3); S2, after passing through the network nozzle in the pre-network (4), it enters a roller (6) and makes the first turn; S3, then heating in the texturing machine deformation hot box (7) H1, so that the POY pre-oriented yarn is heated to a vitrified state to facilitate deformation; S4, the POY pre-oriented yarn in the vitrified state is cooled by a cooling plate (8) and then enters a false twister (9). The false twister (9) rotates through a combination of an inlet disk, a working disk, and an outlet disk to cause the passing yarn to be twisted and untwisted, thereby making the yarn bundle fluffy; S5, the yarn bundle processed by the false twister (9) passes through the tension sensor (10) and then enters the second roller (11). The tension sensor (10) detects and records the untwisting tension of the yarn bundle in real time to facilitate quality control. The untwisting tension T2 = 50-70g; S6, after the filament bundle passes through the second roller (11), it directly enters the second heat box (12) to heat-set the filament bundle; S7, after the tow comes out of the second hot box (12), it changes direction through the action of the yarn guide (16), and then enters the three rollers (13) to make the tow form a relaxed state, which is conducive to the second hot box (12) H2 heat setting; S8, the filament bundle passes through the three rollers (13) and enters the oiling device (14). After being oiled by the oil tanker, the filament bundle enters the winding device (15) for winding and forming, thereby forming a DTY high-loft and stretchable spandex coated yarn.

2. The method for preparing a DTY high-loft and stretchable spandex coated yarn according to claim 1, characterized in that: The shaft speed of the roller (6) is 300-500m / min.

3. The method for preparing a DTY high-loft and stretchable spandex coated yarn according to claim 2, characterized in that: The second shaft speed of the second roller (11) is 600-850 m / min, and the shaft speed difference ratio between the second roller (11) and the first roller (6) is 1.4-1.

8.

4. The method for preparing a DTY high-loft and stretchable spandex coated yarn according to claim 3, characterized in that: The yarn bundle entering the three rollers (13) passes between the leather roller and the steel rod by direct pressing. The third axis speed of the three rollers (13) is 500-750 m / min. The axis speed of the three rollers (13) is slower than that of the two rollers (11).

5. The method for preparing a DTY high-loft and stretchable spandex coated yarn according to claim 2, characterized in that: The heating temperature of the spring deformation hot box is 180-220°C.

6. The method for preparing a DTY high-loft and stretchable spandex coated yarn according to claim 1, characterized in that: When the tow in step S5 enters the second roller (11), it is wound 2-3 times between the top roller and the guide roller, and the guide roller is set at an angle.

7. The method for preparing a DTY high-loft and stretchable spandex coated yarn according to claim 1, characterized in that: The temperature of the second heat box (12) is 150-200°C, and the filament bundle is heat-set in the second heat box (12) by non-contact heating.

8. The method for preparing a DTY high-loft and stretchable spandex coated yarn according to claim 5, characterized in that: The rotation speed of the oil roller of the oil tanker in step S8 is 0.2-1.2 rpc / min, and the winding speed of the winding device (15) is 580-830 m / min.

9. The method for preparing the DTY high-loft and stretchable spandex coated yarn according to claim 1, characterized in that: An anti-stuck device (5) is provided between the first roller (6) and the pre-network (4).

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