Heterochromatic bunched filament and its processing equipment

Abstract

The application belongs to the technical field of blended filaments, and discloses a heterochromatic slub blended filament and a processing equipment thereof, which comprise a core and a sheath layer, the core is made of two-component elastic polyester drawn yarn, and the sheath layer is made of soft heterochromatic slub pre-oriented yarn; wherein the elastic polyester drawn yarn is provided with a high-elasticity crimp structure under the action of heat treatment and stretching by utilizing the characteristics of high and low adhesion. The application can guarantee that the sheath layer completely wraps the core while having the characteristics of high elasticity, so that the characteristics of heterochromatic slub are achieved. The heterochromatic slub blended filament has the advantages of good low-temperature resistance, high tensile strength, high chemical corrosion resistance and the like.

Description

Technical Field

[0001] This invention relates to the field of blended filament technology, and in particular to a heterochromatic slub blended filament and its processing equipment. Background Technology

[0002] In recent years, comfortable, casual, and relaxed clothing styles have become increasingly popular. Products not only need to have a good appearance but also excellent performance. Slub yarn is one of the most diverse types of fancy yarns. By utilizing the different lengths, thicknesses, and spacings of the slub sections, a wide variety of styles can be developed. Fabrics made from slub yarn feature prominent patterns, unique styles, and strong three-dimensionality, satisfying the needs of various consumers.

[0003] Chinese patent application CN201110169699.0 discloses a PA250 core-sheath composite yarn, which includes a composite yarn body. The composite yarn body has a two-layer structure, with an outer nylon fiber layer and an inner PBT fiber layer. The double-layer structure makes the product more layered, and the inner PBT fiber layer has a lower cost. It has the same quality and performance as existing all-nylon fiber yarns.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: the composite yarn only includes a PBT fiber layer and a nylon fiber layer, and no explanation is given regarding the relationship between the amount of each layer of materials, the preparation method of the PA250 core-sheath composite yarn, or the performance experimental data of the composite yarn. It is difficult to clearly define and guarantee the mechanical properties and elasticity of the composite yarn, thus limiting the application range of the composite yarn. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a heterochromatic slub-joint blended filament and its processing equipment.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a heterochromatic slub blended filament comprising a core and a sheath, wherein the core is made of bicomponent elastic polyester drawn yarn and the sheath is made of soft heterochromatic slub pre-oriented yarn; wherein the elastic polyester drawn yarn utilizes the characteristics of high and low viscosity to produce a highly elastic crimped structure under heat treatment and stretching.

[0007] Furthermore, the ratio of the elastic polyester drawn yarn to the pre-oriented yarn is 1:1 to 1:2, and the sheath completely wraps around the core.

[0008] By adopting the above technical solution, the core elastic polyester drawn yarn uses bicomponent polyester yarn. Utilizing its high and low viscosity characteristics, a highly elastic crimped structure is generated under heat treatment and stretching, thus obtaining a high-elastic polyester drawn yarn. The high-elastic polyester drawn yarn serves as the core yarn, and the soft, discolored slub pre-oriented yarn serves as the sheath layer. The ratio of the two is controlled at 1:1 to 1:2, ensuring that the sheath layer completely encloses the core while maintaining high elasticity, thereby achieving the characteristics of discolored slub.

[0009] Furthermore, the elastic polyester drawn yarn is made of polyester chips and polyurethane chips, with the polyester chips accounting for 70% to 80% by weight and the polyurethane chips accounting for 20% to 30% by weight; the pre-oriented yarn is prepared by modifying polyester chips with graphene, and the polyester chips are composed of any one of polypropylene terephthalate, polyethylene terephthalate, or polybutylene terephthalate.

[0010] By adopting the above technical solutions, polyester chips are mainly produced from terephthalic acid and ethylene glycol through esterification and polycondensation reactions, possessing advantages such as good low-temperature resistance, high tensile strength, and strong chemical corrosion resistance. Polyurethane chips exhibit excellent oil resistance, solvent resistance, water resistance, fire resistance, and high elasticity. The two-dimensional layered structure of graphene can enhance the orientation of polyester molecular chains, increasing the tensile strength of the material by more than 30%, achieving a Young's modulus on the order of 1.0 TPa, while maintaining high toughness. Elastic polyester drawn yarn and pre-oriented yarn are blended into blended filaments, which greatly improves the blended filaments' resistance to chlorine, acids, high temperatures, aging resistance, high elasticity, wearing comfort, and easy-to-wear properties.

[0011] Furthermore, the preparation method of the pre-oriented yarn is as follows: 1.2% to 1.5% of graphene, 0.8% to 2.0% of color masterbatch, and 96.5% to 98.0% of polyester chips are weighed according to the weight ratio and fed into a screw extruder for extrusion. Subsequently, the yarn is sequentially subjected to ring blowing, oiling, and winding to obtain the pre-oriented yarn. The three zones of the screw extruder are 255℃, 260℃, and 265℃, respectively; the spinning temperature is 265℃ to 270℃; the side blowing air temperature is 23℃ to 25℃; the side blowing air velocity is 0.5m / s to 0.8m / s; the relative humidity is 67% to 70%; the oil-water ratio is 22% to 23%; the oiling rate is 0.3% to 0.35%; and the winding speed is 3800m / min to 4000m / min.

[0012] By employing the above technical solutions, graphene sheets can block the diffusion of oxygen and heat, increasing the glass transition temperature of polyester chips by 10–15°C and the thermal decomposition temperature by more than 50°C. The dense sheet structure of graphene can extend the penetration path of corrosive media, reducing the water vapor permeability of the modified polyester by 70% and improving its chemical corrosion resistance by more than 2 times. Pre-oriented filaments prepared from graphene-modified polyester chips exhibit excellent high-temperature resistance, thermal stability, and corrosion resistance, which is beneficial for improving the overall performance of blended filaments.

[0013] Furthermore, the raw materials for preparing pre-oriented yarn need to be dried under vacuum at 120℃~125℃ for 8~10h until the moisture content is less than 30ppm.

[0014] Furthermore, the viscosity difference between the polyester chips and the polyurethane chips is 0.25 dL / g.

[0015] By adopting the above technical solution, polyester chips, as a high-viscosity component, can provide strength support for the core filament, while polyurethane chips, as a low-viscosity component, serve as the skin layer of the core to enhance elastic deformation capability. Through parallel composite spinning, elastic polyester drawn yarn with a bicomponent fiber structure is formed, and the shrinkage difference induces crimping and stabilizes the crimp shape.

[0016] Furthermore, the method for preparing the elastic polyester drawn yarn includes the following steps:

[0017] S1. Weigh out polyester chips according to the proportion and dry them at a temperature of 125℃~130℃ for 4.5h~5h until the moisture content is less than 30ppm. Weigh out polyurethane chips according to the proportion and dry them under vacuum at 85℃~90℃ for 5h~7h until the moisture content is less than 30ppm.

[0018] S2. The dried polyester chips and polyurethane chips are fed into a twin-screw extruder for extrusion. Then, the fibers are sequentially subjected to ring blowing, oiling, winding, bundling, two-stage stretching, false twisting texturing, relaxation heat setting, and cutting to obtain the initial blended yarn product.

[0019] The melt spinning temperature is 270℃~275℃, the side-blowing air temperature is 23℃~25℃, the side-blowing air velocity is 0.6m / s~0.8m / s, the relative humidity is 67%~70%, the oil-to-water ratio is 22%~23%, the oiling rate is 0.3%~0.35%, the winding speed is 2000m / min~2200m / min, the first-stage drawing temperature is 95℃~100℃, the first-stage drawing ratio is 1.6~1.8, and the second-stage drawing temperature is 175℃. Temperature ranges from 178℃ to 178℃, with a two-stage draft ratio of 2.0 to 3.0. False twisting and texturing utilizes a friction-type false twister with a D / Y ratio of 1.75. The first heating chamber temperature is 190℃, the second overfeed is 7.5%, the third overfeed is 8.2%, and the second heating chamber temperature is 180℃. Relaxation heat setting employs a chain-plate relaxation heat setting machine, with a drying zone temperature of 115℃ to 118℃, a heat setting zone temperature of 125℃ to 128℃, and a drying heat setting time of 15 to 20 minutes.

[0020] The one-step preparation method of heterochromatic slub blended fiber filament is as follows: take elastic polyester drawn yarn and pre-oriented yarn, and use airflow or mechanical network nozzles to make the elastic polyester drawn yarn and pre-oriented yarn intertwine and combine. Then, the pre-oriented yarn is unevenly drawn using triangular yarn drawing technology. After that, it is relaxed and heat-set in a hot box at 175℃~178℃. Then, it is oiled with an oil containing antistatic agent and lubricant. Finally, it is wound to obtain heterochromatic slub blended fiber filament.

[0021] In the intertwining step, the heat treatment shrinkage rate of the pre-oriented yarn is controlled to be 8% to 10%, and the heat treatment shrinkage rate of the elastic polyester drawn yarn is 5% to 8%; in the winding step, the bobbin winding tension is 0.12 to 0.14 cN / dtex, and the bus density is 120 to 150 dtex.

[0022] This application also discloses a processing equipment for heterochromatic slub blended filaments, including a screw extruder, a drawing machine, a crimping machine, and a chain plate relaxation heat setting machine. The structure and operating principle of each machine are conventional methods in the field of fiber textiles.

[0023] In summary, the present invention has the following beneficial effects:

[0024] 1. In this application, the core elastic polyester drawn yarn is a bicomponent polyester yarn. Utilizing its high and low viscosity characteristics, a highly elastic crimped structure is generated under heat treatment and stretching, thus obtaining a highly elastic polyester drawn yarn. The highly elastic polyester drawn yarn serves as the core yarn, and the soft, discolored slub pre-oriented yarn serves as the sheath layer. The ratio of the two is controlled at 1:1 to 1:2, ensuring that the sheath layer completely wraps the core while maintaining high elasticity, thereby achieving the characteristics of discolored slub.

[0025] 2. In this application, the polyester chips are mainly produced by esterification and polycondensation of terephthalic acid and ethylene glycol, possessing advantages such as good low-temperature resistance, high tensile strength, and strong chemical corrosion resistance; the polyurethane chips have excellent oil resistance, solvent resistance, water resistance, fire resistance, and high elasticity; the two-dimensional layered structure of graphene can enhance the orientation of polyester molecular chains, increasing the tensile strength of the material by more than 30%, with a Young's modulus reaching the 1.0 TPa level, while maintaining high toughness. The elastic polyester drawn yarn and pre-oriented yarn are blended into blended filaments, which greatly improves the blended filaments' resistance to chlorine, acid, high temperature, aging resistance, high elasticity, wearing comfort, and easy-to-wear properties.

[0026] 3. In this application, the graphene sheets can block the diffusion of oxygen and heat, increasing the glass transition temperature of the polyester chips by 10–15°C and the thermal decomposition temperature by more than 50°C. The dense sheet structure of graphene can extend the penetration path of corrosive media, reducing the water vapor permeability of the modified polyester by 70% and improving its chemical corrosion resistance by more than 2 times. The pre-oriented yarn prepared from graphene-modified polyester chips has good high-temperature resistance, thermal stability, and corrosion resistance, which is beneficial to improving the overall performance of blended filaments. Attached Figure Description

[0027] Figure 1 This is a planar schematic diagram of the heterochromatic bamboo-joint blended filaments in an embodiment of the present invention.

[0028] In the diagram: 1. Core; 2. Sheath. Detailed Implementation

[0029] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] Example 1

[0031] like Figure 1 As shown in the illustration, this application discloses a heterochromatic slub blended filament comprising a core and a sheath. The core is made of bicomponent elastic polyester drawn yarn, and the sheath is made of soft, heterochromatic pre-oriented yarn. The elastic polyester drawn yarn utilizes its high and low viscosity properties to create a highly elastic crimped structure under heat treatment and stretching. The ratio of the elastic polyester drawn yarn to the pre-oriented yarn is 1:1, and the sheath completely encloses the core.

[0032] The core yarn, elastic polyester drawn yarn, is made of bicomponent polyester yarn. Utilizing its high and low viscosity properties, a highly elastic crimped structure is created through heat treatment and stretching, resulting in high-elasticity polyester drawn yarn. This high-elasticity polyester drawn yarn serves as the core yarn, while the soft, discolored slub pre-oriented yarn serves as the sheath layer. The ratio of the two is controlled at 1:1 to 1:2, ensuring that the sheath layer completely encloses the core while maintaining high elasticity, thus achieving the characteristics of discolored slub joints.

[0033] The elastic polyester drawn yarn is made of polyester chips and polyurethane chips, with the polyester chips accounting for 70% by weight and the polyurethane chips accounting for 20% by weight; the pre-oriented yarn is prepared by modifying the polyester chips with graphene, and the polyester chips are composed of any one of polypropylene terephthalate, polyethylene terephthalate or polybutylene terephthalate.

[0034] Polyester chips are mainly produced from terephthalic acid and ethylene glycol through esterification and polycondensation reactions, possessing advantages such as good low-temperature resistance, high tensile strength, and strong chemical corrosion resistance. Polyurethane chips exhibit excellent oil resistance, solvent resistance, water resistance, fire resistance, and high elasticity. The two-dimensional layered structure of graphene can enhance the orientation of polyester molecular chains, increasing the tensile strength of the material by more than 30%, achieving a Young's modulus on the order of 1.0 TPa, while maintaining high toughness. Elastic polyester drawn yarns are blended with pre-oriented yarns to form blended filaments, which greatly improves the blended filaments' resistance to chlorine, acids, high temperatures, aging resistance, high elasticity, wearing comfort, and easy-to-wear properties.

[0035] The pre-oriented yarn is prepared as follows: 1.2% graphene, 0.8% masterbatch, and 96.5% polyester chips are weighed according to the specified weight ratio and fed into a screw extruder for extrusion. The extruder then undergoes sequential ring blowing, oiling, and winding to obtain the pre-oriented yarn. The screw extruder's three-zone temperatures are 255℃, 260℃, and 265℃, with a spinning temperature of 265℃, a side blowing air temperature of 23℃, a side blowing air velocity of 0.5 m / s, a relative humidity of 67%, an oil-to-water ratio of 22%, an oiling rate of 0.3%, and a winding speed of 3800 m / min. Before being fed into the screw extruder, the raw materials for preparing the pre-oriented yarn need to be dried under vacuum at 120℃ for 8 hours until the moisture content is less than 30 ppm.

[0036] Graphene sheets can block the diffusion of oxygen and heat, increasing the glass transition temperature of polyester chips by 10–15°C and the thermal decomposition temperature by more than 50°C. The dense sheet structure of graphene can extend the penetration path of corrosive media, reducing the water vapor permeability of modified polyester by 70% and improving chemical corrosion resistance by more than 2 times. Pre-oriented yarns prepared from graphene-modified polyester chips exhibit excellent high-temperature resistance, thermal stability, and corrosion resistance, which is beneficial for improving the overall performance of blended filaments.

[0037] It is worth noting that the viscosity difference between the polyester chips and the polyurethane chips is 0.25 dL / g. The polyester chips, as the high-viscosity component, provide strength support for the core filaments, while the polyurethane chips, as the low-viscosity component, enhance the elastic deformation capability of the core's outer layer. Through parallel composite spinning, a bicomponent fiber structure of elastic polyester drawn yarn is formed, utilizing the difference in shrinkage to induce crimping and stabilize the crimp shape.

[0038] In this embodiment, the method for preparing the elastic polyester drawn yarn includes the following steps:

[0039] S1. Weigh out polyester chips according to the proportion and dry them at 125℃ for 4.5 hours until the moisture content is less than 30ppm. Weigh out polyurethane chips according to the proportion and dry them under vacuum at 85℃ for 5 hours (to avoid moisture absorption affecting the stability of the blend melt) until the moisture content is less than 30ppm.

[0040] S2. The dried polyester chips and polyurethane chips are fed into a twin-screw extruder for extrusion (to achieve physical entanglement of polyester and polyurethane). Then, the fibers are sequentially blown, oiled, wound, bundled, stretched in two stages, false twisted texturing, relaxed heat setting, and cut to obtain the initial product of the blended yarn.

[0041] The melt spinning temperature was 270℃, the side-blowing air temperature was 23℃, the side-blowing air velocity was 0.6m / s, the relative humidity was 67%, the oil-to-water ratio was 22%, the oiling rate was 0.3%, the winding speed was 2000m / min, the first-stage drafting temperature was 95℃, the first-stage drafting ratio was 1.6, the second-stage drafting temperature was 175℃ (to initially improve molecular orientation), and the second-stage drafting ratio was 2.0; the false twist texturing used a friction-type false twister, the D / Y ratio was 1.75, the first hot box temperature was 190℃, the second overfeed was 7.5%, the third overfeed was 8.2%, and the second hot box temperature was 180℃ (relaxation heat setting to eliminate internal stress and stabilize fiber morphology); the relaxation heat setting used a chain plate relaxation heat setting machine, the drying zone temperature was 115℃, the heat setting zone temperature was 125℃, and the drying heat setting time was 15min.

[0042] The preparation method of the heterochromatic slub blended filament is as follows: take elastic polyester drawn yarn and pre-oriented yarn, and use airflow or mechanical network nozzles to make the elastic polyester drawn yarn and pre-oriented yarn intertwine and combine (to form heterochromatic shrinkage characteristics). Then, use triangular yarn drawing technology to perform uneven drawing (combined with the elastic recovery force of EDY to form a composite crimp shape). After that, perform relaxation heat setting in a 175℃ hot box (to eliminate internal stress and stabilize shrinkage performance). Then, use an oil agent containing antistatic agent and lubricant for oiling treatment (to reduce the coefficient of friction and improve weaving processability). Finally, wind it to obtain the heterochromatic slub blended filament.

[0043] In the intertwining step, the heat treatment shrinkage rate of the pre-oriented yarn is controlled at 8%, and the heat treatment shrinkage rate of the elastic polyester drawn yarn is 5% (to produce a fluffy effect); in the winding step, the bobbin winding tension is 0.12cN / dtex, and the bus density is 120dtex.

[0044] This embodiment also discloses a processing equipment for heterochromatic slub blended filaments, including a screw extruder, a drawing machine, a crimping machine, and a chain plate relaxation heat setting machine. The structure and operating principle of each machine are conventional methods in the field of fiber textile.

[0045] Example 2

[0046] like Figure 1 As shown in the illustration, this application discloses a heterochromatic slub blended filament comprising a core and a sheath. The core is made of bicomponent elastic polyester drawn yarn, and the sheath is made of soft, heterochromatic pre-oriented yarn. The elastic polyester drawn yarn utilizes its high and low viscosity properties to create a highly elastic crimped structure under heat treatment and stretching. The ratio of the elastic polyester drawn yarn to the pre-oriented yarn is 1:2, and the sheath completely encloses the core.

[0047] The elastic polyester drawn yarn is made of polyester chips and polyurethane chips, with polyester chips accounting for 80% by weight and polyurethane chips accounting for 30% by weight; the pre-oriented yarn is prepared by modifying polyester chips with graphene, and the polyester chips are composed of any one of polypropylene terephthalate, polyethylene terephthalate or polybutylene terephthalate.

[0048] The pre-oriented yarn is prepared as follows: 1.5% graphene, 2.0% masterbatch, and 98.0% polyester chips are weighed according to the following weight ratio and fed into a screw extruder for extrusion. The yarn is then sequentially subjected to ring blowing, oiling, and winding to obtain the pre-oriented yarn. The screw extruder's three-zone temperatures are 255℃, 260℃, and 265℃, the spinning temperature is 270℃, the side blowing air temperature is 25℃, the side blowing air velocity is 0.8 m / s, the relative humidity is 70%, the oil-to-water ratio is 23%, the oiling rate is 0.35%, and the winding speed is 4000 m / min. Before feeding into the screw extruder, the raw materials for preparing the pre-oriented yarn need to be dried under vacuum at 125℃ for 10 hours until the moisture content is less than 30 ppm.

[0049] It is worth noting that the viscosity difference between the polyester chips and the polyurethane chips is 0.25 dL / g.

[0050] In this embodiment, the method for preparing the elastic polyester drawn yarn includes the following steps:

[0051] S1. Weigh out polyester chips according to the proportion and dry them at 130℃ for 5 hours until the moisture content is less than 30ppm. Weigh out polyurethane chips according to the proportion and dry them under vacuum at 90℃ for 7 hours (to avoid moisture absorption affecting the stability of the blended melt) until the moisture content is less than 30ppm.

[0052] S2. The dried polyester chips and polyurethane chips are fed into a twin-screw extruder for extrusion (to achieve physical entanglement of polyester and polyurethane). Then, the fibers are sequentially blown, oiled, wound, bundled, stretched in two stages, false twisted texturing, relaxed heat setting, and cut to obtain the initial product of the blended yarn.

[0053] The melt spinning temperature was 275℃, the side-blowing air temperature was 25℃, the side-blowing air velocity was 0.8m / s, the relative humidity was 70%, the oil-to-water ratio was 23%, the oiling rate was 0.35%, the winding speed was 2200m / min, the first-stage drafting temperature was 100℃, the first-stage drafting ratio was 1.8, the second-stage drafting temperature was 178℃ (to initially improve molecular orientation), and the second-stage drafting ratio was 3.0; the false twist texturing used a friction-type false twister, the D / Y ratio was 1.75, the first hot box temperature was 190℃, the second overfeed was 7.5%, the third overfeed was 8.2%, and the second hot box temperature was 180℃ (relaxation heat setting to eliminate internal stress and stabilize fiber morphology); the relaxation heat setting used a chain plate relaxation heat setting machine, the drying zone temperature was 118℃, the heat setting zone temperature was 128℃, and the drying heat setting time was 20min.

[0054] The preparation method of the heterochromatic slub blended filament is as follows: take elastic polyester drawn yarn and pre-oriented yarn, and use airflow or mechanical network nozzles to make the elastic polyester drawn yarn and pre-oriented yarn intertwine and combine (to form heterochromatic shrinkage characteristics). Then, use triangular yarn drawing technology to perform uneven drawing (combined with the elastic recovery force of EDY to form a composite crimp shape). After that, perform relaxation heat setting in a 178℃ hot box (to eliminate internal stress and stabilize shrinkage performance). Then, use an oil agent containing antistatic agent and lubricant for oiling treatment (to reduce the coefficient of friction and improve weaving processability). Finally, wind it to obtain the heterochromatic slub blended filament.

[0055] In the intertwining step, the heat treatment shrinkage rate of the pre-oriented yarn is controlled at 10%, and the heat treatment shrinkage rate of the elastic polyester drawn yarn is 8% (to produce a fluffy effect); in the winding step, the bobbin winding tension is 0.14cN / dtex, and the bus density is 150dtex.

[0056] Example 3

[0057] like Figure 1As shown in the illustration, this application discloses a heterochromatic slub blended filament comprising a core and a sheath. The core is made of bicomponent elastic polyester drawn yarn, and the sheath is made of soft, heterochromatic pre-oriented yarn. The elastic polyester drawn yarn utilizes its high and low viscosity properties to create a highly elastic crimped structure under heat treatment and stretching. The ratio of the elastic polyester drawn yarn to the pre-oriented yarn is 1:2, and the sheath completely encloses the core.

[0058] The elastic polyester drawn yarn is made of polyester chips and polyurethane chips, with the polyester chips accounting for 75% by weight and the polyurethane chips accounting for 25% by weight; the pre-oriented yarn is prepared by modifying the polyester chips with graphene, and the polyester chips are composed of any one of polypropylene terephthalate, polyethylene terephthalate or polybutylene terephthalate.

[0059] The pre-oriented yarn is prepared as follows: 1.3% graphene, 1.4% masterbatch, and 97.0% polyester chips are weighed according to the following weight ratio and fed into a screw extruder for extrusion. The yarn is then sequentially passed through a ring blower, oiled, and wound to obtain the pre-oriented yarn. The screw extruder's three-zone temperatures are 255℃, 260℃, and 265℃, the spinning temperature is 268℃, the side blower temperature is 24℃, the side blower velocity is 0.65 m / s, the relative humidity is 68%, the oil-to-water ratio is 22.5%, the oiling rate is 0.3%, and the winding speed is 3900 m / min. Before being fed into the screw extruder, the raw materials for preparing the pre-oriented yarn need to be dried under vacuum at 123℃ for 9 hours until the moisture content is less than 30 ppm.

[0060] It is worth noting that the viscosity difference between the polyester chips and the polyurethane chips is 0.25 dL / g.

[0061] In this embodiment, the method for preparing the elastic polyester drawn yarn includes the following steps:

[0062] S1. Weigh out polyester chips according to the proportion and dry them at 128℃ for 4.8 hours until the moisture content is less than 30ppm. Weigh out polyurethane chips according to the proportion and dry them under vacuum at 88℃ for 6 hours (to avoid moisture absorption affecting the stability of the blended melt) until the moisture content is less than 30ppm.

[0063] S2. The dried polyester chips and polyurethane chips are fed into a twin-screw extruder for extrusion (to achieve physical entanglement of polyester and polyurethane). Then, the fibers are sequentially blown, oiled, wound, bundled, stretched in two stages, false twisted texturing, relaxed heat setting, and cut to obtain the initial product of the blended yarn.

[0064] The melt spinning temperature was 272℃, the side-blowing air temperature was 24℃, the side-blowing air velocity was 0.7m / s, the relative humidity was 68%, the oil-to-water ratio was 22.5%, the oiling rate was 0.3%, the winding speed was 2100m / min, the first-stage drafting temperature was 98℃, the first-stage drafting ratio was 1.7, the second-stage drafting temperature was 176℃ (to initially improve molecular orientation), and the second-stage drafting ratio was 2.5; the false twist texturing used a friction-type false twister, the D / Y ratio was 1.75, the first hot box temperature was 190℃, the second overfeed was 7.5%, the third overfeed was 8.2%, and the second hot box temperature was 180℃ (relaxation heat setting to eliminate internal stress and stabilize fiber morphology); the relaxation heat setting used a chain plate relaxation heat setting machine, the drying zone temperature was 117℃, the heat setting zone temperature was 126℃, and the drying heat setting time was 18min.

[0065] The preparation method of heterochromatic slub blended filament is as follows: take elastic polyester drawn yarn and pre-oriented yarn, and use airflow or mechanical network nozzles to make the elastic polyester drawn yarn and pre-oriented yarn intertwine and combine (to form heterochromatic shrinkage characteristics). Then, use triangular yarn drawing technology to perform uneven drawing (combined with the elastic recovery force of EDY to form a composite crimp shape). After that, perform relaxation heat setting in a 176℃ hot box (to eliminate internal stress and stabilize shrinkage performance). Then, use an oil agent containing antistatic agent and lubricant for oiling treatment (to reduce the coefficient of friction and improve weaving processability). Finally, wind it to obtain heterochromatic slub blended filament.

[0066] In the intertwining step, the heat treatment shrinkage rate of the pre-oriented yarn is controlled to be 8% to 10%, and the heat treatment shrinkage rate of the elastic polyester drawn yarn is 7% (to produce a fluffy effect); in the winding step, the bobbin winding tension is 0.13cN / dtex, and the bus density is 135dtex.

[0067] Comparative Example 1

[0068] This comparative example discloses a heterochromatic slub-joint blended filament, which differs from Example 3 only in that the elastic polyester drawn yarn is entirely composed of polyester chips.

[0069] Comparative Example 2

[0070] This comparative example discloses a heterochromatic slub-joint blended filament, which differs from Example 3 only in that the elastic polyester drawn yarn is entirely composed of polyurethane chips.

[0071] Comparative Example 3

[0072] This comparative example discloses a heterochromatic bamboo-joint blended filament, which differs from Example 3 only in that the pre-oriented filament is not modified with graphene, and the graphene ratio is replaced with an equal proportion of color masterbatch.

[0073] Comparative Example 4

[0074] This comparative example discloses a heterochromatic slub blended filament, which differs from Example 3 only in that the ratio between the high-elastic polyester drawn yarn and the soft heterochromatic slub pre-oriented yarn is 1:3.

[0075] Comparative Example 5

[0076] This comparative example discloses a heterochromatic slub blended filament, which differs from Example 3 only in that the ratio between the high-elastic polyester drawn yarn and the soft heterochromatic slub pre-oriented yarn is 1:4.

[0077] Comparative Example 6

[0078] This comparative example discloses a heterochromatic slub blended filament, which differs from Example 3 only in that the ratio between the high-elastic polyester drawn yarn and the soft heterochromatic slub pre-oriented yarn is 1:5.

[0079] Comparative Example 7

[0080] This comparative example discloses a heterochromatic slub blended filament, which differs from Example 3 only in that the ratio between the high-elastic polyester drawn yarn and the soft heterochromatic slub pre-oriented yarn is 2:1.

[0081] Comparative Example 8

[0082] This comparative example discloses a heterochromatic slub blended filament, which differs from Example 3 only in that the ratio between the high-elastic polyester drawn yarn and the soft heterochromatic slub pre-oriented yarn is 3:1.

[0083] Comparative Example 9

[0084] This comparative example discloses a heterochromatic slub blended filament, which differs from Example 3 only in that the ratio between the high-elastic polyester drawn yarn and the soft heterochromatic slub pre-oriented yarn is 4:1.

[0085] The heterochromatic slub blended filaments obtained in Examples 1-3 and Comparative Examples 1-9 were subjected to performance testing. The testing standards were based on GB / T14343-2008 "Test Method for Linear Density of Chemical Fiber Filaments", GB / T14344-2008 "Test Method for Tensile Properties of Chemical Fiber Filaments", and GB / T6505-2008 "Test Method for Heat Shrinkage Rate of Chemical Fiber Filaments". The test results are shown in Table 1.

[0086] Table 1

[0087]

[0088]

[0089] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A type of mixed-fiber filament with different colors of bamboo joints, characterized in that: It includes a core and a sheath, the core being made of bicomponent elastic polyester drawn yarn and the sheath being made of soft, discolored slub pre-oriented yarn; The elastic polyester drawn yarn utilizes the characteristics of high and low viscosity to produce a highly elastic crimped structure under heat treatment and stretching. The ratio of the elastic polyester drawn yarn to the pre-oriented yarn is 1:1 to 1:2, and the sheath completely wraps the core. The elastic polyester drawn yarn is made of polyester chips and polyurethane chips, with the polyester chips accounting for 70% to 80% by weight and the polyurethane chips accounting for 20% to 30% by weight. The pre-oriented yarn is prepared by modifying polyester chips with graphene. The polyester chips are composed of any one of polypropylene terephthalate, polyethylene terephthalate, or polybutylene terephthalate. The pre-oriented yarn is prepared by weighing 1.2% to 1.5% of graphene, 0.8% to 2.0% of color masterbatch and 96.5% to 98.0% of polyester chips according to the weight ratio and feeding them into a screw extruder for extrusion. Then, the yarn is sequentially blown by a ring blower, oiled and wound to obtain the pre-oriented yarn. The screw extruder has three temperature zones of 255℃, 260℃, and 265℃, a spinning temperature of 265℃~270℃, a side-blowing air temperature of 23℃~25℃, a side-blowing air velocity of 0.5m / s~0.8m / s, a relative humidity of 67%~70%, an oil-water ratio of 22%~23%, an oiling rate of 0.3%~0.35%, and a winding speed of 3800m / min~4000m / min. The preparation method of the elastic polyester drawn yarn includes the following steps: S1. Weigh out polyester chips according to the proportion and dry them at a temperature of 125℃~130℃ for 4.5h~5h until the moisture content is less than 30ppm. Weigh out polyurethane chips according to the proportion and dry them under vacuum at 85℃~90℃ for 5h~7h until the moisture content is less than 30ppm. S2. The dried polyester chips and polyurethane chips are fed into a twin-screw extruder for extrusion. Then, the fibers are sequentially subjected to ring blowing, oiling, winding, bundling, two-stage stretching, false twist texturing, relaxation heat setting, and cutting to obtain the initial blended yarn product. The melt spinning temperature is 270℃~275℃, the side-blowing air temperature is 23℃~25℃, the side-blowing air velocity is 0.6m / s~0.8m / s, the relative humidity is 67%~70%, the oil-to-water ratio is 22%~23%, the oiling rate is 0.3%~0.35%, the winding speed is 2000m / min~2200m / min, the first-stage drawing temperature is 95℃~100℃, the first-stage drawing ratio is 1.6~1.8, and the second-stage drawing temperature is 175℃. Temperature ranges from 178℃ to 178℃, with a two-stage draft ratio of 2.0 to 3.

0. False twisting and texturing utilizes a friction-type false twister with a D / Y ratio of 1.

75. The first heating chamber temperature is 190℃, the second overfeed is 7.5%, the third overfeed is 8.2%, and the second heating chamber temperature is 180℃. Relaxation heat setting employs a chain-plate relaxation heat setting machine, with a drying zone temperature of 115℃ to 118℃, a heat setting zone temperature of 125℃ to 128℃, and a drying heat setting time of 15 to 20 minutes.

2. The heterochromatic slub-joint blended filament according to claim 1, characterized in that: The raw materials for preparing pre-oriented yarn need to be dried under vacuum at 120℃~125℃ for 8~10h until the moisture content is less than 30ppm.

3. The heterochromatic slub-joint blended filament according to claim 1, characterized in that: The viscosity difference between the polyester chips and the polyurethane chips is 0.25 dL / g.

4. The heterochromatic slub-joint blended filament according to claim 1, characterized in that, The preparation method of the heterochromatic slub blended fiber filament is as follows: take elastic polyester drawn yarn and pre-oriented yarn, and make the elastic polyester drawn yarn and pre-oriented yarn intertwine and combine through airflow or mechanical network nozzle. Then, the pre-oriented yarn is unevenly drawn using triangular yarn drawing technology. After that, it is relaxed and heat-set in a hot box at 175℃~178℃. Then, it is oiled with an oil containing antistatic agent and lubricant. Finally, it is wound to obtain the heterochromatic slub blended fiber filament. In the intertwining step, the heat treatment shrinkage rate of the pre-oriented yarn is controlled to be 8% to 10%, and the heat treatment shrinkage rate of the elastic polyester drawn yarn is 5% to 8%; in the winding step, the bobbin winding tension is 0.12 to 0.14 cN / dtex, and the bus density is 120 to 150 dtex.

5. A processing device for heterochromatic slub-jointed blended filaments according to any one of claims 1-4, characterized in that, This includes screw extruders, drawing machines, coilers, and chain-plate relaxation heat setters.

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