High-velvet-feeling elastic yarn and preparation method thereof

Abstract

The invention relates to the technical field of elastic yarns, in particular to a high-velvet-feeling elastic yarn and a preparation method thereof. The preparation method comprises the following steps: taking PBT / PET double-component fibers as core yarns and polyester POY as sheath yarns; after the core yarn is subjected to S-direction pre-elasticizing and light interlacing processing, the core yarn and the sheath yarn are subjected to Z-direction main elasticizing and heavy interlacing together; the network node density of the light network is 135 to 150 / m, and the network pressure is 0.15 to 0.2 MPa; the density of network nodes of the heavy network is 100-120 / m, and the network pressure is 0.25-0.3 MPa. According to the preparation method, PBT / PET double-component fibers are adopted as core yarn to provide memory resilience and cotton feeling, and polyester POY is adopted as sheath yarn to enhance velvet feeling performance. After the core yarn is subjected to S-direction pre-elasticizing and light network processing, the core yarn and the sheath yarn are subjected to Z-direction main elasticizing and heavy network processing together, light networks and heavy networks are alternately distributed, network pressure is increased in a stepped mode, a dumbbell-shaped special structure is formed, the velvet feeling is enhanced, and the elasticity recovery rate is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of elastic yarn, in particular to a high-pile elastic yarn and a preparation method thereof. BACKGROUND

[0002] Although the single-component PBT (polybutylene terephthalate) yarn has good elastic recovery rate, its elastic recovery rate decays rapidly, and the elastic recovery rate exceeds 15% after 100 times of stretching test. The rapid elastic decay limits its application in fabrics with high elasticity and high durability requirements. The prior art improves the elasticity and durability of the yarn by compounding PBT with other components, such as the T800 elastic fiber disclosed in the Chinese patent CN113584908A, which is prepared by parallel compounding of PBT and PET polyester fibers. However, the traditional elasticizing process cannot coordinate the difference in thermal properties of the two polymers, and the network node distribution of the elasticized DTY (draw textured yarn) yarn is uneven, which easily leads to sparse pile on the fabric surface and cannot achieve high-pile effect. SUMMARY

[0003] The present application relates to the technical field of elastic yarn, in particular to a high-pile elastic yarn and a preparation method thereof.

[0004] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows: a preparation method of a high-pile elastic yarn, comprising the following steps: taking PBT / PET (polybutylene terephthalate / polyethylene terephthalate) dual-component fiber as core yarn and taking polyester POY (pre-oriented yarn) as sheath yarn; after the core yarn is subjected to S-direction pre-elasticizing and light network processing, the core yarn and the sheath yarn are subjected to Z-direction main elasticizing and heavy network processing. The network pressure of the light network is 0.15-0.2 MPa, and the network pressure of the heavy network is 0.25-0.3 MPa.

[0005] Another technical scheme adopted by the present application is as follows: using the above-mentioned preparation method of a high-pile elastic yarn to prepare a high-pile elastic yarn.

[0006] The present application has the following advantages: the preparation method of the present application uses PBT / PET dual-component fiber as core yarn to provide memory resilience and cotton feel, and uses polyester POY as sheath yarn to enhance pile performance. After the core yarn is subjected to S-direction pre-elasticizing and light network processing, the core yarn and the sheath yarn are subjected to Z-direction main elasticizing and heavy network processing. The light network and the heavy network are alternately distributed, the network pressure is stepwise improved to form a dumbbell-shaped "special structure, which enhances the pile and improves the elastic recovery rate. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1Process flow chart of the preparation method of the high-softness elastic yarn in the embodiment of the present application Figure 2 Structural schematic diagram of the high-softness elastic yarn in the embodiment of the present application Figure 3 Schematic diagram of the network node forming a "dumbbell type" special structure in the embodiment of the present application Figure 4 Physical diagram of the PBT / PET bicomponent fiber in the embodiment of the present application

[0008] Label description 1, PBT / PET bicomponent fiber; 2, regenerated polyester POY; 3, pre-heating hot box; 4, S-direction false twister; 5, single-channel nozzle; 6, first roller; 7, deformation hot box; 8, Z-direction false twister; 9, second roller; 10, double-channel nozzle; 11, auxiliary roller; 12, setting hot box; 13, third roller; 14, winding device Specific implementation

[0009] To explain the technical content, the achieved purposes and effects of the present application in detail, the following will be explained in combination with the embodiments and the accompanying drawings.

[0010] Please refer to Figure 1 and 2 A preparation method of a high-softness elastic yarn, comprising the following steps: taking PBT / PET bicomponent fiber as core yarn and taking polyester POY as sheath yarn; after the core yarn is subjected to S-direction pre-elasticization and light network processing, the core yarn and the sheath yarn are subjected to Z-direction main elasticization and heavy network together; The network node density of the light network is 135-150 / m; the network pressure of the heavy network is 0.25-0.3 MPa.

[0011] From the above description, the beneficial effects of the present application are as follows: the preparation method of the present application adopts PBT / PET bicomponent fiber as core yarn, and forms a double composite structure through polyester POY coating, wherein the PBT / PET bicomponent fiber generates spontaneous three-dimensional crimping, and the crimping number is 18-22 / 25 mm, so as to provide memory resilience and cotton feeling, and the polyester POY is used for enhancing the softness performance. After the core yarn is subjected to S-direction pre-elasticization and light network processing, the core yarn and the sheath yarn are subjected to Z-direction main elasticization and heavy network together, the light network and the heavy network are alternately distributed, so as to form a ladder type node distribution of 110-150 / m, the network node combination strength is improved to 8.7 N / node, the network node forms a "dumbbell type" special structure (please refer to Figure 3 ), the softness locking is enhanced, and the desired hand feeling of the fabric is ensured, and the softness of the yarn is improved. The elastic recovery rate of the high-softness elastic yarn of the present application reaches 92.3% compared with the PBT / PET bicomponent fiber.

[0012] Further, the network node density of the light network is 135-150 / m, and the network node density of the heavy network is 100-120 / m.

[0013] As can be seen from the above description, the pitch of the heavy network is longer than the pitch of the short pitch, so as to form a left-right asymmetric structure of the yarn.

[0014] Further, the PBT / PET bicomponent fiber is a special-shaped section.

[0015] As can be seen from the above description, the special-shaped section can improve the elasticity of the fiber.

[0016] Further, 0.8-1.2wt% of the toughening agent is added to the PBT / PET bicomponent fiber.

[0017] Further, the toughening agent is SEBS-g-MAH toughening agent.

[0018] As can be seen from the above description, the conventional toughening agent adopts POE-g-MAH system, and the SEBS-g-MAH toughening agent is added in the application, so that the interfacial bonding strength is ≥9.2N / mm 2 (SEM-EDS verification), the PBT component and the PET component are not easy to peel off, the heterogeneous material melting interface is stably controlled, the two components adhere to each other to form a double helix structure, and an elastic stable spring state is formed.

[0019] Excessive toughening agent will increase the spinning breakage and decrease the excellent rate, and excessive addition may affect the material rigidity and reduce the elastic recovery rate. Therefore, the addition amount of the toughening agent is controlled to be 0.8-1.2wt%.

[0020] Further, the single fiber fineness of the PBT / PET bicomponent fiber is 0.34-0.38dtex.

[0021] As can be seen from the above description, the PBT / PET bicomponent fiber is superfine denier, and the specific surface area is increased, which brings a better velvet experience. The combination of superfine denier POY and superfine denier T8 will make the multi-thread velvet feel stronger.

[0022] Further, the PBT / PET bicomponent fiber is spun by using a side-by-side type double-screw composite spinning device, the PET melting zone temperature is 255-265℃, the PBT melting zone temperature is 220-230℃, and after the two melts flow through the distribution plate, a "dumbbell type" special-shaped section with a special-shaped degree >85% is formed.

[0023] Further, the pre-elastication speed of S is 580-680m / min.

[0024] Further, the heating temperature of the pre-elastication of S is 165-175℃.

[0025] Further, the heating temperature of the Z-direction main elasticizing is 195-205 DEG C.

[0026] From the above description, it is known that the heating temperature affects the yarn curling and the fabric hand feeling.

[0027] Further, the double-channel nozzle is used in the re-networking.

[0028] From the above description, it is known that the double-channel nozzle causes a network interaction state, so that the yarn is more three-dimensional and the pile feeling is better.

[0029] Further, the slow cooling and setting step after the re-networking is further included, and the slow cooling and setting temperature is 155-165 DEG C.

[0030] From the above description, it is known that the temperature gradient of the present application is established: 165-175 DEG C (S-direction pre-elasticizing) -> 195-205 DEG C (Z-direction main elasticizing) -> 160 DEG C (slow cooling), so that the PET crystallinity is increased to 48%, which is significantly higher than the conventional process of 42-45%.

[0031] The pre-elasticizing temperature, the main elasticizing temperature and the slow cooling and setting temperature of the present application form a new temperature gradient protection interval.

[0032] Further, the winding step after the slow cooling and setting is further included, and the winding tension is 0.15-0.20 CN / dtex.

[0033] Further, the PBT / PET bicomponent fiber is used as the core yarn, and the polyester POY is used as the sheath yarn; the core yarn sequentially passes through the pre-heating oven, the S-direction false twister, and the single-channel nozzle; then, the core yarn is combined with the sheath yarn passing through the first roller and the deformation oven, and sequentially passes through the Z-direction false twister, the second roller, the double-channel nozzle, the auxiliary roller, the setting oven, the third roller and the winding device, so that the high-pile elastic yarn is obtained.

[0034] Another technical solution of the present application is to use the above-mentioned preparation method of the high-pile elastic yarn to prepare the high-pile elastic yarn.

[0035] From the above description, it is known that the high-pile elastic yarn of the present application has a three-dimensional spiral structure of "core-sheath covering + bidirectional elasticizing", and has excellent elasticity, hand feeling and high pile feeling.

[0036] Please refer to Figures 1-3 The embodiment one of the present application is a preparation method of a high-pile elastic yarn, and the steps are as follows: S1: using parallel type double screw composite spinning device to spin, PBT and PET chips are sequentially subjected to double screw melting, distribution plate compounding, special-shaped spinneret, air blowing cooling, oil spraying and winding to prepare 50D / 144F special-shaped section PBT / PET bicomponent fiber 1 (PBT 40wt%+PET 60wt%, PET crystallinity 48% / PBT crystallinity 32% (DSC test)); Wherein, the PET melting zone temperature is 260℃, the PBT melting zone temperature is 225℃, the side blowing speed is 0.45m / s, both melts are added with 1.0wt% SEBS-g-MAH toughening agent, and after confluence by the distribution plate, a "dumbbell type" special-shaped section with a special-shaped degree >85% is formed, see Figure 4 ; S2: using the above 50D / 144F special-shaped section PBT / PET bicomponent fiber 1 as core yarn, and the single filament fineness is 0.36dtex; using 30D / 72F regenerated polyester POY 2 as sheath yarn.

[0037] S3: the core yarn is sequentially subjected to preheating hot box 3, S-direction false twister 4 and single channel nozzle 5 for S-direction pre-twist and light network processing; the sheath yarn is sequentially subjected to first roller 6 and deformation hot box 7.

[0038] S4: the core yarn and the sheath yarn are sequentially subjected to Z-direction false twister 8, second roller 9 and double channel nozzle 10 for Z-direction main twist and heavy network; then sequentially subjected to auxiliary roller 11 to enter setting hot box 12 for slow cooling setting, and finally sequentially subjected to third roller 13 and winding device 14 to obtain high-soft-feeling elastic yarn; the process parameters are shown in Table 1.

[0039] Table 1

[0040] The comparative example one of the application is: The difference between the comparative example one and the example one is only that no toughening agent is added.

[0041] The comparative example two of the application is: The difference between the comparative example two and the example one is only that both false twisters are S-direction false twisters.

[0042] The comparative example three of the application is: The difference between the comparative example three and the example one is only that there is no single channel nozzle, and the core yarn is sequentially subjected to preheating hot box and S-direction false twister, and then sequentially subjected to Z-direction false twister, second roller, double channel nozzle, auxiliary roller, setting hot box, third roller and winding device together with the sheath yarn.

[0043] The high-soft-feeling elastic yarn prepared by the example one is subjected to performance detection, and the detection results are shown in Tables 2 and 3.

[0044] Table 2

[0045] Table 3

[0046] Embodiment two of the present application is a preparation method of high-softness elastic yarn, steps as follows: S1: using parallel type double screw composite spinning device to spin, PBT and PET chips are sequentially subjected to double screw melting, distribution plate compounding, special-shaped spinneret, air blowing cooling, oil spraying and winding forming to prepare 50D / 144F special-shaped section PBT / PET bicomponent fiber (PBT 40wt%+PET 60wt%); Wherein, the PET melting zone temperature is 265℃, the PBT melting zone temperature is 230℃, the side blowing speed is 0.45m / s, 1.2wt% SEBS-g-MAH toughening agent is added to the two melts, and after confluence through the distribution plate, the "dumbbell type" special-shaped section with special-shaped degree >85% is formed; S2: using the above 50D / 144F special-shaped section PBT / PET bicomponent fiber as core yarn, and the single yarn fineness is 0.38dtex; using 30D / 72F regenerated polyester POY as sheath yarn.

[0047] S3: the core yarn is sequentially subjected to preheating hot box, S direction false twister and single channel nozzle for S direction pre-elasticizing and light network processing; the sheath yarn is sequentially subjected to first roller and deformation hot box.

[0048] S4: the core yarn and the sheath yarn are sequentially subjected to Z direction false twister, second roller and double channel nozzle for Z direction main elasticizing and heavy network; Then sequentially subjected to auxiliary roller to enter the setting hot box for slow cooling setting, and finally sequentially subjected to third roller and winding device to obtain high-softness elastic yarn; the process parameters are shown in Table 4.

[0049] Table 4

[0050] Embodiment three of the present application is a preparation method of high-softness elastic yarn, steps as follows: S1: using parallel type double screw composite spinning device to spin, PBT and PET chips are sequentially subjected to double screw melting, distribution plate compounding, special-shaped spinneret, air blowing cooling, oil spraying and winding forming to prepare 50D / 144F special-shaped section PBT / PET bicomponent fiber (PBT 40wt%+PET 60wt%); Wherein, the PET melting zone temperature is 255 DEG C, the PBT melting zone temperature is 220 DEG C, the side blowing speed is 0.45 m / s, both the melts are added with 0.8 wt% SEBS-g-MAH toughening agent, and after converging through a distribution plate, a "dumbbell type" special section with a special section degree of more than 85% is formed; S2: the above 50D / 144F special section PBT / PET bicomponent fiber is used as core yarn, and the single filament fineness is 0.34 dtex; the 30D / 72F regenerated polyester POY is used as sheath yarn.

[0051] S3: the core yarn passes through a preheating hot box, and then sequentially passes through an S-direction false twister and a single-channel nozzle to perform S-direction pre-elastication and light network processing; the sheath yarn sequentially passes through a first roller and a deformation hot box.

[0052] S4: the core yarn and the sheath yarn sequentially pass through a Z-direction false twister, a second roller and a double-channel nozzle to perform Z-direction main elastication and heavy network; then sequentially pass through an auxiliary roller to enter a setting hot box to perform slow cooling setting, and finally sequentially pass through a third roller and a winding device to obtain a high-softness elastic yarn; the process parameters are shown in Table 5.

[0053] Table 5

[0054] Embodiment four of the application is that the high-softness elastic yarn is prepared by the preparation method in embodiment one.

[0055] In summary, the high-softness elastic yarn and the preparation method thereof have the following advantages: 1. The PBT / PET bicomponent fiber is used as the core yarn, and the polyester POY is used as the sheath yarn, so that the memory resilience, cotton feeling and high-softness performance are achieved.

[0056] 2. The light network and the heavy network are alternately distributed, the network nodes form a "dumbbell type" special structure, the softness locking is enhanced, and the fabric hand feeling is ensured.

[0057] 3. The SEBS-g-MAH toughening agent is added in the PBT / PET bicomponent fiber to form an elastic stable spring state.

[0058] 4. The PBT / PET bicomponent fiber and the polyester POY are both superfine denier, and the multiple softness is improved.

[0059] 5. The double-channel nozzle is used in the heavy network to form an interactive network state, so that the yarn is more three-dimensional and the softness is better.

[0060] 6. The slow cooling setting step is added to improve the PET crystallinity The above merely illustrates the embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent transformation or direct or indirect application in the related technical field based on the content of the present application specification and drawings is also included in the patent protection scope of the present application.

Claims

1. A method of making a high-softness elastic yarn, characterized by, It comprises the following steps: PBT / PET bicomponent fiber is used as core yarn and polyester POY is used as sheath yarn; the core yarn is processed by S-direction pre-elasticization and light network after which it is processed by Z-direction main elasticization and heavy network together with the sheath yarn; The network pressure of the light network is 0.15-0.2 MPa; the network pressure of the heavy network is 0.25-0.3 MPa.

2. The method of making a high-loft elastic yarn according to claim 1, wherein, The PBT / PET bicomponent fiber is of special-shaped cross section.

3. The method of making a high-loft elastic yarn according to claim 1, wherein, 0.8-1.2 wt% toughening agent is added in the PBT / PET bicomponent fiber.

4. The method of making a high-loft elastic yarn according to claim 1, wherein, The filament fineness of the PBT / PET bicomponent fiber is 0.34-0.38 dtex.

5. The method of making a high-loft elastic yarn according to claim 1, wherein, The elasticization speed of the S-direction pre-elasticization and the Z-direction main elasticization is both 580-680 m / min.

6. The method of making a high-loft elastic yarn according to claim 1, wherein, The heating temperature of the S-direction pre-elasticization is 165-175 ℃.

7. The method of making a high-loft elastic yarn according to claim 1, wherein, The heating temperature of the Z-direction main elasticization is 195-205 ℃.

8. The method of making a high-loft elastic yarn according to claim 1, wherein, It further comprises a slow cooling setting step after the heavy network, the temperature of the slow cooling setting being 155-165 ℃.

9. The method of making a high-loft stretch yarn according to claim 8, wherein, It further comprises a winding step after the slow cooling setting, the tension of the winding being 0.15-0.20 CN / dtex.

10. A high-soft-feeling elastic yarn prepared by the method of any one of claims 1-9.

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