Nylon 6 DTY (Draw Textured Yarn) produced by overfeeding and production method thereof

Abstract

The invention discloses a production method of chinlon 6 DTY (Draw Textured Yarn) for overfeeding production, which comprises the following steps: a chinlon 6 POY (Polyester Pre-Oriented Yarn) sequentially passes through a raw yarn frame, a yarn guide pipe, a yarn cutter, a first roller, a push-pull rod, a twist stopper, a hot box, a cooling plate, a false twister and a second roller to obtain a first chinlon 6 draw textured yarn; the other chinlon 6 POY sequentially passes through a raw yarn frame, a yarn guide pipe, a yarn cutter, a first roller, a push-pull rod, a twist stopper, a hot box, a cooling plate, a false twister and a second roller, and second chinlon 6 textured yarn is obtained; combining the two chinlon 6 draw textured yarns, and combining the two chinlon 6 draw textured yarns with a network nozzle, a third roller, a yarn detector, an oiling device, an oil roller and a winding device through a network device to obtain chinlon 6 draw textured yarns (DTY); and the linear speed difference of the two second rollers is 30-70 m / min. When two chinlon 6 POY yarns are plied, the produced chinlon 6 DTY generates a three-dimensional spiral winding structure due to overfeeding difference, so that the bulkiness and softness of the chinlon 6 DTY are improved, and the chinlon 6 DTY is soft, comfortable, smooth and full.

Description

Technical Field

[0001] The present invention belongs to the technical field of textile fibers, and particularly relates to a nylon 6 DTY produced by overfeeding and its production method. Background Art

[0002] Nylon 6 DTY (Draw Textured Yarn) is a synthetic fiber made by a texturing process, with excellent elasticity, abrasion resistance and chemical resistance. Its initial modulus is close to that of wool, with a soft handfeel, a small density, and a moisture absorption second only to vinylon among synthetic fibers, with a conditioned regain of 4.5%. Its air permeability and moisture absorption are better than those of polyester. In addition, nylon 6 DTY has excellent resilience and is suitable for elastic fabrics such as webbing, hosiery and seamless underwear.

[0003] Chinese Patent Application No. CN202210073916.4 discloses a production method of nylon 6 DTY cotton-like yarn. This application uses two raw materials A and B of different materials and produces according to the following method: The two raw materials are led out from the creel, passed through the filament cutter, passed through the additional 1.1 roller, and enter the air network duct added between the 1.1 roller and the first roller for pre-spraying to bundle before stretching, and then enter the first roller at a set draft; after passing through the first roller, the two raw materials enter the hot box at a set draft, are then textured together through a false twister, and then pass through the second roller and enter the air network duct between the second roller and the 2A roller at a set overfeed rate for post-spraying; after passing through the 2A roller, they enter the winding area for winding and forming to obtain the required cotton-like yarn. However, this method only adds a 1.1 roller and adds an air network duct between the first roller and the 1.1 roller for pre-spraying to perform pre-overfeeding and achieve the pre-bundling effect of the yarn, so that the obtained yarn has a cotton-like effect, and the improvement of the softness of nylon 6 DTY by this method is limited. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a nylon 6 DTY produced by overfeeding and its production method.

[0005] The technical solution of the present invention is as follows:

[0006] One of the purposes of the present invention is to provide a production method of nylon 6 DTY produced by overfeeding, including the following steps:

[0007] S1: Pass a nylon 6 POY through a creel, a thread guiding tube, a filament cutter, a first roller, a push-pull rod, a twist stopper, a hot box, a cooling plate, a false twister and a second roller in sequence to obtain a first nylon 6 textured yarn;

[0008] S2: Pass another polyamide 6 POY through a raw silk stand, a wire guiding tube, a cutter, a first roller, a push-pull rod, a false-twist stopper, a hot box, a cooling plate, a false-twister and a second roller in sequence to obtain a second texturized polyamide 6 filament;

[0009] S3: Merge the first texturized polyamide 6 filament and the second texturized polyamide 6 filament, and pass them together through a networker, a network nozzle, a third roller, a yarn detector, an oil roller of an oiling device and a winding device to produce the polyamide 6 DTY produced by overfeeding;

[0010] Among them, in steps S1 and S2, the linear speed difference between the two second rollers is 30 - 70 m / min, and the overfeeding rates of the first texturized polyamide 6 filament and the second texturized polyamide 6 filament are both 0.043 - 0.140.

[0011] Further, in steps S1 and S2, the temperature of the hot box is 120 - 185 °C.

[0012] Further, in steps S1 and S2, the speed ratio of the false-twister is 1.45 - 1.75.

[0013] Further, in steps S1 and S2, the combination mode of the false-twister is 1 - 4 - 1, 1 - 5 - 1, 1 - 6 - 1 or 1 - 7 - 1.

[0014] Further, in steps S1 and S2, the linear speed of the second roller is 500 - 700 m / min.

[0015] Further, in step S3, the network air pressure is 1.0 - 4.0.

[0016] Further, in steps S1 and S2, the draw ratio of the first texturized polyamide 6 filament and the second texturized polyamide 6 filament is 1.18 - 1.36.

[0017] The second object of the present invention is to provide a polyamide 6 DTY prepared by the production method of the polyamide 6 DTY produced by overfeeding according to any one of the above.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. A production method of polyamide 6 DTY produced by overfeeding provided by the present invention controls the linear speed difference of the second roller in steps S1 and S2 to make the crimp shrinkage rates of the first polyamide 6 drawn texturized yarn and the second polyamide 6 drawn texturized yarn quite different. When two polyamide 6 POY yarns are plied in step S3, a three-dimensional spiral winding structure is generated in the produced polyamide 6 DTY due to the overfeeding difference, thereby significantly improving the bulkiness and softness of the polyamide 6 DTY, making it soft, comfortable, compliant and full. Moreover, the present invention forms an internal stress buffer layer in the yarn during the stretching process through the combination of differential shrinkage filaments, improving the breaking strength of the polyamide 6 DTY and endowing it with the characteristics of high strength and high elasticity.

[0020] 2. A production method of polyamide 6 DTY produced by overfeeding provided by the present invention combines the glass transition temperature of polyamide 6. By controlling the hot box temperature within the range of 120 - 185 °C, while ensuring sufficient molecular chain orientation, overheating damage is avoided, the fiber crystallinity is controlled within a reasonable range, and the yarn breakage rate is significantly reduced.

[0021] 3. A production method of polyamide 6 DTY produced by overfeeding provided by the present invention realizes the crimp uniformity and stability by controlling the false twister speed ratio and the combination mode of the false twister, ensuring the process consistency of subsequent overfeeding compounding.

[0022] 4. A production method of polyamide 6 DTY produced by overfeeding provided by the present invention controls the network air pressure at 1.0 - 4.0 for the shrinkage rate difference of the double - ply drawn texturized yarn, which can optimize the network node density and bonding strength, enhance the structural stability of the composite yarn and improve the weaving efficiency.

[0023] 5. A polyamide 6 DTY produced by overfeeding provided by the present invention has a surface friction coefficient ≤ 0.12, good touch feeling, and is suitable for close - fitting fabrics such as high - end underwear and home clothes; the polyamide 6 DTY has good bulkiness, endowing the fabric with a three - dimensional velvet feeling. At the same time, its gram weight is lower than that of similar bulky yarns, meeting the "lightweight and thick" demand for autumn and winter fabrics; the shrinkage difference between the two components forms a micro - gap structure between the fibers, improving the dye penetration rate. After the subsequent dyeing, finishing and weaving processes, the woven fabric has a softer, more comfortable, compliant and full hand feeling. Detailed implementation mode

[0024] The present invention will be further described below in conjunction with preferred embodiments. In the scope disclosed in the present invention, the endpoints and any values of the scope are not limited to the exact scope or value. These scopes or values should be understood to include values close to these scopes or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein. The materials, reagents, etc. used in the following embodiments can be obtained from commercial channels without special instructions. The experimental methods in the following embodiments are conventional methods without special instructions.

[0025] Example 1

[0026] This embodiment provides a production method of nylon 6 DTY by overfeeding, including the following steps:

[0027] S1: Pass a nylon 6 POY white yarn 35D / 34F through a raw silk stand, a wire guiding tube, a cutter, a first roller, a push-pull rod, a twist stopper, a hot box, a cooling plate, a false twister, and a second roller in sequence to obtain a first nylon 6 textured yarn;

[0028] In this embodiment, the linear speed of the second roller of the first nylon 6 POY white yarn is 630 m / min, and the overfeeding rates of the first nylon 6 textured yarn and the second nylon 6 textured yarn are both 0.043.

[0029] S2: Pass another nylon 6 POY white yarn 35D / 34F through a raw silk stand, a wire guiding tube, a cutter, a first roller, a push-pull rod, a twist stopper, a hot box, a cooling plate, a false twister, and a second roller in sequence to obtain a second nylon 6 textured yarn;

[0030] In this embodiment, the linear speed of the second roller of the second nylon 6 POY white yarn is 700 m / min,

[0031] S3: Combine the first nylon 6 textured yarn and the second nylon 6 textured yarn, and pass them together through a networker, a network nozzle, a third roller, a yarn detector, an oiling device oil roller, and a winding device to produce the nylon 6 DTY by overfeeding, with a specification of 60D / 68F.

[0032] In this embodiment, in steps S1 and S2, the temperature of the hot box is 165 °C, the speed ratio of the false twister is 1.75, and the combination mode of the false twister is 1-5-1.

[0033] In step S3 of this embodiment, the network air pressure is 1.0.

[0034] In this embodiment, in steps S1 and S2, the draw ratio of the first nylon 6 textured yarn and the second nylon 6 textured yarn is 1.275.

[0035] Example 2

[0036] This example provides a production method of superfeed-produced nylon 6 DTY, including the following steps:

[0037] S1: Pass a nylon 6 POY white yarn 83D / 68F through a creel, a thread guide tube, a cutter, a first roller, a push-pull rod, a stopper, a hot box, a cooling plate, a false twister and a second roller in sequence to obtain a first nylon 6 textured yarn;

[0038] In this example, the linear speed of the second roller of the first nylon 6 POY white yarn is 500 m / min, and the superfeed ratios of the first nylon 6 textured yarn and the second nylon 6 textured yarn are both 0.140.

[0039] S2: Pass another nylon 6 POY white yarn 83D / 68F through a creel, a thread guide tube, a cutter, a first roller, a push-pull rod, a stopper, a hot box, a cooling plate, a false twister and a second roller in sequence to obtain a second nylon 6 textured yarn;

[0040] In this example, the linear speed of the second roller of the second nylon 6 POY white yarn is 530 m / min,

[0041] S3: Combine the first nylon 6 textured yarn and the second nylon 6 textured yarn, and pass them together through a networker, a network jet nozzle, a third roller, a yarn detector, an oiling device oil roller and a winding device to produce the superfeed-produced nylon 6 DTY with a specification of 140D / 136F.

[0042] In this example, in steps S1 and S2, the temperature of the hot box is 185 °C, the speed ratio of the false twister is 1.55, and the combination mode of the false twister is 1-6-1.

[0043] In step S3 of this example, the network air pressure is 4.0.

[0044] In this example, in steps S1 and S2, the draw ratio of the first nylon 6 textured yarn and the second nylon 6 textured yarn is 1.18.

[0045] Example 3

[0046] This example provides a production method of superfeed-produced nylon 6 DTY, including the following steps:

[0047] S1: Pass a nylon 6 POY black yarn 83D / 96F through a creel, a thread guide tube, a cutter, a first roller, a push-pull rod, a stopper, a hot box, a cooling plate, a false twister and a second roller in sequence to obtain a first nylon 6 textured yarn;

[0048] In this embodiment, the linear velocity of the second roller of the first polyamide 6 POY black yarn is 540 m / min, and the overfeed ratios of the first polyamide 6 drawn texturized yarn and the second polyamide 6 drawn texturized yarn are both 0.100.

[0049] S2: Pass another polyamide 6 POY white yarn 87D / 24F through a raw silk stand, a yarn guide tube, a yarn cutter, a first roller, a push-pull rod, a twist stopper, a hot box, a cooling plate, a false twister and a second roller in sequence to obtain the second polyamide 6 drawn texturized yarn;

[0050] In this embodiment, the linear velocity of the second roller of the second polyamide 6 POY white yarn is 600 m / min.

[0051] S3: Combine the first polyamide 6 drawn texturized yarn and the second polyamide 6 drawn texturized yarn, and pass them together through a networker, a network nozzle, a third roller, a yarn detector, an oil roller of an oiling device and a winding device to produce the polyamide 6 DTY produced by overfeeding, with a specification of 140D / 120F.

[0052] In this embodiment, in steps S1 and S2, the temperature of the hot box is 120 °C, the speed ratio of the false twister is 1.45, and the combination mode of the false twister is 1-6-1.

[0053] In step S3 of this embodiment, the network air pressure is 2.6.

[0054] In this embodiment, in steps S1 and S2, the draw ratios of the first polyamide 6 drawn texturized yarn and the second polyamide 6 drawn texturized yarn are 1.36.

[0055] Example 4

[0056] It is basically the same as Example 1, except that in this embodiment, the speed ratio of the false twister is 1.42 and the combination mode of the false twister is 1-7-0.

[0057] Example 5

[0058] It is basically the same as Example 1, except that in step S1 of this embodiment, the linear velocity of the second roller is 400 m / min, and in step S2, the linear velocity of the second roller is 470 m / min.

[0059] Example 6

[0060] It is basically the same as Example 1, except that in step S1 of this embodiment, the linear velocity of the second roller is 730 m / min, and in step S2, the linear velocity of the second roller is 800 m / min.

[0061] Comparative Example 1

[0062] The difference from Example 1 is that the linear speed of the second roller of the first polyamide 6 POY white yarn in this comparative example is 700 m / min.

[0063] Comparative Example 2

[0064] The difference from Example 1 is that the linear speed of the second roller of the second polyamide 6 POY white yarn in this comparative example is 630 m / min.

[0065] Evaluation of implementation effect

[0066] The following is a specific test on the yarns prepared in Examples 1-6 and Comparative Examples 1-2 to further illustrate the excellent effects achieved by the present invention. The test results are shown in the following table:

[0067] Table 1 Statistical table of performance test results

[0068]

[0069]

[0070] Among them, the fineness test is carried out with reference to the relevant standards of GB / T 14343-2022; the breaking elongation and breaking strength are carried out with reference to the relevant standards of GB / T 14344-2022; the crimp shrinkage rate and crimp stability are carried out with reference to the relevant standards of GB / T 14338-2022; the boiling water shrinkage rate test is carried out with reference to the relevant standards of GB / T 6505.

[0071] It can be seen from Table 1 that the polyamide 6 DTY fiber prepared by the preparation method of the present invention has better crimp shrinkage rate and crimp stability, and at the same time has good breaking elongation and boiling water shrinkage rate.

[0072] After the subsequent dyeing, finishing and weaving processes of the polyamide 6 DTY, the handle of the woven fabric is softer, more comfortable, compliant and plump. The product has both the smooth and delicate handle of polyamide 6 drawn yarn and the gentle luster of polyamide 6 elastic yarn; while maintaining the unique characteristics of synthetic fiber polyamide 6, it realizes a soft cotton quality, reflecting the connotation of technology and nature.

[0073] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A production method of nylon 6 DTY produced by overfeeding, characterized in that, It includes the following steps: S1: Pass a polyamide 6 POY through a creel, a thread guiding tube, a cutter, a first roller, a push-pull rod, a twist stopper, a hot box, a cooling plate, a false twister and a second roller in sequence to obtain a first texturized polyamide 6 yarn; S2: Pass another polyamide 6 POY through a creel, a thread guiding tube, a cutter, a first roller, a push-pull rod, a twist stopper, a hot box, a cooling plate, a false twister and a second roller in sequence to obtain a second texturized polyamide 6 yarn; S3: Combine the first texturized polyamide 6 yarn and the second texturized polyamide 6 yarn, and pass them together through an air-jet texturing device, a network nozzle, a third roller, a yarn detector, an oil roller of an oiling device and a winding device to produce the polyamide 6 DTY produced by overfeeding; Among them, in step S1 and step S2, the linear speed difference between the two second rollers is 30 - 70 m / min, and the overfeeding rates of the first texturized polyamide 6 yarn and the second texturized polyamide 6 yarn are both 0.043 - 0.

140.

2. The production method of polyamide 6 DTY produced by overfeeding according to claim 1, characterized in that In step S1 and step S2, the temperature of the hot box is 120 - 185 °C.

3. The production method of polyamide 6 DTY produced by overfeeding according to claim 1, characterized in that, In step S1 and step S2, the speed ratio of the false twister is 1.45 - 1.

75.

4. A production method of polyamide 6 DTY produced by overfeeding according to claim 1, characterized in that, In step S1 and step S2, the combination mode of the false twisters is 1 - 4 - 1, 1 - 5 - 1, 1 - 6 - 1 or 1 - 7 - 1.

5. A production method of polyamide 6 DTY produced by overfeeding according to claim 1, characterized in that, In step S1 and step S2, the linear speed of the second roller is 500 - 700 m / min.

6. The method for producing nylon 6DTY by overfeeding according to claim 1, wherein: In step S3, the network air pressure is 1.0 - 4.

0.

7. A production method of nylon 6 DTY produced by overfeeding according to claim 1, characterized in that, In step S1 and step S2, the draw ratios of the first texturized polyamide 6 yarn and the second texturized polyamide 6 yarn are 1.18 - 1.

36.

8. A polyamide 6 DTY prepared by the production method of the polyamide 6 DTY produced by overfeeding according to any one of claims 1 - 7.

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