Different-color bamboo joint mixed fiber filament and processing equipment thereof

Abstract

The invention belongs to the technical field of blended filaments, and discloses a heterochromatic bamboo joint mixed fiber filament and processing equipment thereof.The heterochromatic bamboo joint mixed fiber filament comprises a core part and a sheath layer, the core part is made of bi-component elastic polyester drawn yarn, and the sheath layer is made of soft heterochromatic bamboo joint pre-oriented yarn; wherein the elastic polyester drawn yarn is of a high-elasticity crimp structure generated under the action of heat treatment and stretching by utilizing the characteristics of high viscosity and low viscosity. According to the invention, the sheath layer can completely wrap the core part and has the characteristic of high elasticity, so that the characteristic of different-color bamboo joints is achieved. The heterochromatic bamboo joint mixed fiber filament has the advantages of being good in low temperature resistance, large in tensile strength, high in chemical corrosion resistance and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of blended filaments, in particular to a different-color bamboo-jointed blended filament and processing equipment thereof. Background Art

[0002] In recent years, comfortable, casual, and relaxed clothing styles have become increasingly popular. Products must not only have a good appearance but also excellent wearability. Slub yarn is the most diverse type of fancy yarn. By utilizing the varying lengths, thicknesses, and pitches of the slub sections, slub yarns can be developed into a variety of styles. These fabrics feature striking patterns, unique styles, and a strong three-dimensional effect, meeting the needs of a wide range of consumers.

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

[0004] Regarding the above-mentioned related 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 for the dosage relationship of each layer of materials, the preparation method of the PA250 sheath-core composite yarn, and the performance experimental data of the composite yarn, etc., which makes it difficult to clarify and guarantee the mechanical properties and elastic properties of the composite yarn, thereby limiting the application scope of the composite yarn. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a different-color bamboo-jointed blended filament and a processing device thereof.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a different-color bamboo-jointed blended filament, comprising a core and a sheath, the core being made of a two-component elastic polyester drawn yarn, and the sheath being made of a soft different-color bamboo-jointed pre-oriented yarn; wherein the elastic polyester drawn yarn utilizes the characteristics of high and low viscosity to produce a highly elastic curled structure under heat treatment and stretching.

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

[0008] By adopting this technical solution, the core elastic polyester drawn yarn uses a bicomponent polyester yarn, leveraging its high-low viscosity properties to produce a highly elastic crimped structure through heat treatment and stretching, resulting in a high-elasticity polyester drawn yarn. The high-elasticity polyester drawn yarn serves as the core yarn, while the soft, multicolored, pre-oriented yarn of the bamboo knot serves as the sheath. The ratio of the two is controlled at 1:1 to 1:2, ensuring that the sheath completely wraps the core while maintaining its high elasticity, thus achieving the characteristics of the multicolored bamboo knot.

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

[0010] By adopting the above technical solution, polyester chips are mainly produced from terephthalic acid and ethylene glycol through esterification and polycondensation reactions, and have advantages such as good low-temperature resistance, high tensile strength, and strong chemical corrosion resistance. 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% and the Young's modulus to 1.0 TPa while maintaining high toughness. Elastic polyester drawn yarn is blended with pre-oriented yarn to form mixed fiber filament, which greatly improves the chlorine resistance, acid resistance, high temperature resistance, anti-aging, high elasticity, wearing comfort, and easy care of the mixed fiber filament.

[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 masterbatch and 96.5% to 98.0% of polyester chips are weighed according to a weight ratio and fed into a screw extruder for extrusion, and then subjected to ring blowing, oiling and winding in sequence to obtain the pre-oriented yarn; wherein: the three zone temperatures of the screw extruder are 255°C, 260°C and 265°C respectively, the spinning temperature is 265°C to 270°C, the side blowing temperature is 23°C to 25°C, the side blowing speed 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 this technical solution, graphene sheets can block the diffusion of oxygen and heat, raising the glass transition temperature of polyester chips by 10-15°C and their thermal decomposition temperature by over 50°C. The dense graphene sheet structure extends the permeation path for corrosive media, reducing the water vapor transmission rate of the modified polyester by 70% and increasing chemical corrosion resistance by more than twofold. Pre-oriented yarns made from graphene-modified polyester chips exhibit excellent high-temperature resistance, thermal stability, and corrosion resistance, improving the overall performance of blended filaments.

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

[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 high-viscosity components can provide strength support for the core fibers, and polyurethane chips as low-viscosity components can serve as the skin layer of the core to enhance the elastic deformation ability. Through parallel composite spinning, elastic polyester drawn fibers with a two-component fiber structure are formed, and the difference in shrinkage rate is used to induce curling and stabilize the curled shape.

[0016] Furthermore, the preparation method of the elastic polyester drawn yarn comprises the following steps:

[0017] S1. Weigh polyester chips in proportion and dry them at a temperature of 125°C to 130°C for 4.5 hours to 5 hours to a moisture content of less than 30 ppm. Weigh polyurethane chips in proportion and dry them at a vacuum temperature of 85°C to 90°C for 5 hours to 7 hours to a moisture content of less than 30 ppm.

[0018] S2, feeding the dried polyester chips and polyurethane chips together into a twin-screw extruder for extrusion, and then sequentially undergoing ring blowing, oiling, winding, bundling, two-stage stretching, false twisting and stretching, relaxation and heat setting, and cutting to obtain a blended yarn primary product;

[0019] The melt spinning temperature is 270℃~275℃, the side blowing temperature is 23℃~25℃, the side blowing speed is 0.6m / s~0.8m / s, the relative humidity is 67%~70%, the oil-water ratio is 22%~23%, the oiling rate is 0.3%~0.35%, the winding speed is 2000m / min~2200m / min, the first drawing temperature is 95℃~100℃, the first drawing ratio is 1.6~1.8, and the second drawing temperature is 175 ℃~178℃, second-stage draft ratio 2.0~3.0; false twist and stretching adopt friction type false twister, D / Y ratio 1.75, first hot box temperature 190℃, second overfeed 7.5%, third overfeed 8.2%, second hot box temperature 180℃; relaxation heat setting adopts chain plate type relaxation heat setting machine, drying zone temperature is 115℃~118℃, heat setting zone temperature is 125℃~128℃, drying heat setting time is 15min~20min.

[0020] The method for preparing the heterochromatic bamboo mixed fiber filament in one step is as follows: taking elastic polyester drawn yarn and pre-oriented yarn, intertwining the elastic polyester drawn yarn and the pre-oriented yarn through air flow or mechanical network nozzle, then unevenly drawing the pre-oriented yarn by using triangular drawing technology, then relaxing and heat-setting in a hot box at 175℃ to 178℃, then oiling with an oil containing an antistatic agent and a lubricant, and finally winding to obtain the heterochromatic bamboo mixed fiber filament;

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

[0022] The present application also discloses a processing device for different-color bamboo-jointed mixed fiber filaments, including a screw extruder, a drawing machine, a crimping machine and a chain-plate relaxation and heat-setting machine. The structure and operation principle of each machine are conventional means in the field of fiber textile.

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

[0024] 1. In this application, the core elastic polyester drawn yarn uses a bicomponent polyester yarn, which utilizes the high-low viscosity characteristics to produce a highly elastic crimped structure under heat treatment and stretching, thereby obtaining a highly elastic polyester drawn yarn. The highly elastic polyester drawn yarn is used as the core yarn, and the pre-oriented yarn of soft, different-color bamboo knots is used as the sheath. The ratio of the two is controlled at 1:1 to 1:2, which ensures that the sheath completely wraps the core while maintaining high elasticity, thereby achieving the characteristics of the different-color bamboo knots.

[0025] 2. In this application, polyester chips are mainly made from terephthalic acid and ethylene glycol through esterification and polycondensation reactions, and have the advantages of good low-temperature resistance, high tensile strength, and strong chemical corrosion resistance; polyurethane chips have excellent oil resistance, solvent resistance, water resistance, fire resistance, and high elasticity; the two-dimensional layer structure of graphene can enhance the orientation of polyester molecular chains, increasing the tensile strength of the material by more than 30%, and the Young's modulus reaches 1.0TPa, while maintaining high toughness. Elastic polyester drawn yarn is blended with pre-oriented yarn to form a blended filament, which greatly improves the chlorine resistance, acid resistance, high temperature resistance, non-aging, high elasticity, comfort, and easy care of the blended filament;

[0026] 3. In this application, 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 over 50°C. The dense graphene sheet structure can extend the permeation path of corrosive media, reducing the water vapor transmission rate of the modified polyester by 70% and increasing 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 can improve the overall performance of blended filaments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 2 is a plan view of different-color bamboo-jointed blended filaments in an embodiment of the present invention.

[0028] In the figure: 1, core; 2, sheath. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; it is obvious that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] Example 1 like Figure 1 As shown, the present embodiment discloses a heterochromatic slub blended filament comprising a core and a sheath. The core is made of a bicomponent elastic polyester drawn yarn, and the sheath is made of a soft, heterochromatic slub pre-oriented yarn. The elastic drawn polyester yarn utilizes its high-low viscosity properties to produce a highly elastic, crimped structure through heat treatment and stretching. The elastic drawn polyester yarn and pre-oriented yarn are added in a 1:1 ratio, and the sheath completely envelops the core.

[0031] The core stretch polyester drawn yarn utilizes bicomponent polyester yarn, utilizing its high-low viscosity properties to create a highly elastic crimped structure through heat treatment and stretching, resulting in a high-elasticity polyester drawn yarn. The high-elasticity polyester drawn yarn serves as the core yarn, while the soft, slub-like, pre-oriented yarn serves as the sheath. The ratio of the two is controlled at 1:1 to 1:2, ensuring the sheath completely envelops the core while maintaining its high elasticity, thus achieving the desired slub-like characteristics.

[0032] The elastic polyester drawn yarn is made of polyester chips and polyurethane chips, with the weight percentage of polyester chips being 70% and the weight percentage of polyurethane chips being 20%; the pre-oriented yarn is prepared by modifying polyester chips with graphene, with the polyester chips being composed of any one of polytrimethylene terephthalate, polyethylene terephthalate or polybutylene terephthalate.

[0033] Polyester chips are primarily produced from terephthalic acid and ethylene glycol through esterification and polycondensation, offering excellent low-temperature resistance, high tensile strength, and strong chemical resistance. Polyurethane chips exhibit excellent oil, solvent, water, and fire resistance, as well as high elasticity. Graphene's two-dimensional layered structure enhances the orientation of polyester molecular chains, increasing the material's tensile strength by over 30% and its Young's modulus to 1.0 TPa while maintaining high toughness. Elastic polyester drawn yarns are blended with pre-oriented yarns to create blended filaments, significantly enhancing their chlorine, acid, and high-temperature resistance, ageing resistance, high elasticity, comfort, and manageability.

[0034] The pre-oriented yarn is prepared by feeding 1.2% graphene, 0.8% masterbatch, and 96.5% polyester chips, according to a weight ratio, into a screw extruder for extrusion, followed by ring blowing, oiling, and winding to obtain the pre-oriented yarn. The three-zone temperature of the screw extruder is 255°C, 260°C, and 265°C, respectively; the spinning temperature is 265°C; the side-blowing temperature is 23°C, the side-blowing speed is 0.5 m / s, the relative humidity is 67%, the oil-water ratio is 22%, the oiling rate is 0.3%, and the winding speed is 3800 m / min. Before feeding into the screw extruder, the raw materials for the pre-oriented yarn are dried under vacuum at 120°C for 8 hours to a moisture content of less than 30 ppm.

[0035] Graphene sheets can block the diffusion of oxygen and heat, raising the glass transition temperature of polyester chips by 10-15°C and their thermal decomposition temperature by over 50°C. The dense graphene sheet structure extends the permeation path for corrosive media, reducing the water vapor transmission rate of the modified polyester by 70% and increasing chemical corrosion resistance by more than twofold. Pre-oriented yarns made from graphene-modified polyester chips exhibit excellent high-temperature resistance, thermal stability, and corrosion resistance, improving the overall performance of blended filaments.

[0036] 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 yarn, while the polyurethane chips, as the low-viscosity component, act as the core skin to enhance elastic deformation capacity. Through parallel composite spinning, a bicomponent fiber structure is formed, in which elastic polyester drawn yarn is induced by the difference in shrinkage rate and stabilizes the curled morphology.

[0037] In this embodiment, the method for preparing the elastic polyester drawn yarn includes the following steps:

[0038] S1. Weigh polyester chips in proportion and dry them at 125° C. for 4.5 hours until the moisture content is less than 30 ppm. Weigh polyurethane chips in proportion and dry them at 85° C. under vacuum for 5 hours (to avoid moisture absorption affecting the stability of the blended melt) until the moisture content is less than 30 ppm.

[0039] S2, the dried polyester chips and polyurethane chips are fed together into a twin-screw extruder for extrusion (to achieve physical entanglement of polyester and polyurethane), followed by ring blowing, oiling, winding, bundling, two-stage stretching, false twisting and stretching, relaxation and heat setting, and cutting to obtain a blended yarn primary product;

[0040] Among them, the melt spinning temperature is 270°C, the side blowing temperature is 23°C, the side blowing speed is 0.6m / s, the relative humidity is 67%, the oil-water ratio is 22%, the oiling rate is 0.3%, the winding speed is 2000m / min, the first stretching temperature is 95°C, the first stretching ratio is 1.6, and the second stretching temperature is 175°C (preliminary improvement of molecular orientation); the second stretching ratio is 2.0; false twisting and stretching adopts a friction type false twister with a D / Y ratio of 1.75, a first hot box temperature of 190°C, a second overfeed of 7.5%, a third overfeed of 8.2%, and a second hot box temperature of 180°C (relaxation heat setting to eliminate internal stress and stabilize fiber morphology); relaxation heat setting adopts a chain plate type relaxation heat setting machine, the drying zone temperature is 115°C, the heat setting zone temperature is 125°C, and the drying heat setting time is 15min.

[0041] The preparation method of the heterochromatic bamboo-jointed filament comprises the following steps: taking elastic polyester drawn yarn and pre-oriented yarn, intertwining the elastic polyester drawn yarn and the pre-oriented yarn through airflow or mechanical network nozzles (forming heterogeneous shrinkage characteristics), then unevenly drawing the pre-oriented yarn using a triangular drawing technique (combining the elastic recovery force of EDY to form a composite crimped morphology), then relaxing and heat-setting in a 175°C hot box (eliminating internal stress and stabilizing shrinkage properties), and then oiling with an oil containing an antistatic agent and a lubricant (reducing the friction coefficient and improving weaving processability), and finally winding the yarn to obtain the heterochromatic bamboo-jointed filament.

[0042] In the intertwining step, the heat treatment shrinkage of the pre-oriented yarn is controlled to be 8%, and the heat treatment shrinkage of the elastic polyester drawn yarn is controlled to be 5% (to produce a fluffy effect); in the winding step, the bobbin winding tension is 0.12 cN / dtex, and the total line density is 120 dtex.

[0043] This embodiment also discloses a processing device for different-color bamboo-jointed mixed fiber filaments, including a screw extruder, a drawing machine, a crimping machine and a chain-plate relaxation heat setting machine. The structure and operation principle of each machine are conventional means in the field of fiber textile.

[0044] Example 2

[0045] like Figure 1 As shown, the present embodiment discloses a heterochromatic slub blended filament comprising a core and a sheath. The core is made of a bicomponent elastic polyester drawn yarn, and the sheath is made of a soft, heterochromatic slub pre-oriented yarn. The elastic drawn polyester yarn utilizes its high-low viscosity properties to produce a highly elastic, crimped structure through heat treatment and stretching. The ratio of the elastic drawn polyester yarn to the pre-oriented yarn is 1:2, and the sheath completely envelops the core.

[0046] The elastic polyester drawn yarn is made of polyester chips and polyurethane chips, with the weight percentage of polyester chips being 80% and the weight percentage of polyurethane chips being 30%; the pre-oriented yarn is prepared by modifying polyester chips with graphene, with the polyester chips being composed of any one of polytrimethylene terephthalate, polyethylene terephthalate or polybutylene terephthalate.

[0047] The pre-oriented yarn is prepared by a method comprising: weighing 1.5% graphene, 2.0% masterbatch, and 98.0% polyester chips in a weight ratio and feeding them together into a screw extruder for extrusion; then, the pre-oriented yarn is subjected to ring blowing, oiling, and winding in sequence to obtain the pre-oriented yarn. The three-zone temperatures of the screw extruder are 255°C, 260°C, and 265°C, respectively; the spinning temperature is 270°C; the side-blowing temperature is 25°C, the side-blowing speed is 0.8 m / s, the relative humidity is 70%, the oil-water ratio is 23%, the oiling rate is 0.35%, and the winding speed is 4000 m / min. Prior to feeding the screw extruder, the raw materials for the pre-oriented yarn are dried under vacuum at 125°C for 10 hours to a moisture content of less than 30 ppm.

[0048] It is worth noting that the viscosity difference between the polyester chips and the polyurethane chips is 0.25 dL / g.

[0049] In this embodiment, the method for preparing the elastic polyester drawn yarn includes the following steps:

[0050] S1. Weigh polyester chips in proportion and dry them at 130° C. for 5 h to a moisture content of less than 30 ppm. Weigh polyurethane chips in proportion and dry them at 90° C. under vacuum for 7 h (to avoid moisture absorption affecting the stability of the blended melt) to a moisture content of less than 30 ppm.

[0051] S2, the dried polyester chips and polyurethane chips are fed together into a twin-screw extruder for extrusion (to achieve physical entanglement of polyester and polyurethane), followed by ring blowing, oiling, winding, bundling, two-stage stretching, false twisting and stretching, relaxation and heat setting, and cutting to obtain a blended yarn primary product;

[0052] Wherein, the melt spinning temperature is 275 ℃, the side blowing temperature is 25 ℃, the side blowing speed is 0.8 m / s, the relative humidity is 70%, the oil-water ratio is 23%, the oiling rate is 0.35%, the winding speed is 2200 m / min, the first stretching temperature is 100 ℃, the first stretching ratio is 1.8, and the second stretching temperature is 178 ℃ (preliminarily improving the molecular orientation degree); the second stretching ratio is 3.0; the false twisting and stretching adopts a friction type false twister with a D / Y ratio of 1.75, a first hot box temperature of 190 ℃, a second overfeed of 7.5%, a third overfeed of 8.2%, and a second hot box temperature of 180 ℃ (relaxation heat setting to eliminate internal stress and stabilize the fiber morphology); the relaxation heat setting adopts a chain plate type relaxation heat setting machine, the drying zone temperature is 118 ℃, the heat setting zone temperature is 128 ℃, and the drying heat setting time is 20 min.

[0053] The preparation method of the heterochromatic bamboo-jointed filament comprises the following steps: taking elastic polyester drawn yarn and pre-oriented yarn, intertwining the elastic polyester drawn yarn and the pre-oriented yarn through airflow or mechanical network nozzles (forming heterogeneous shrinkage characteristics), then unevenly drawing the pre-oriented yarn using a triangular drawing technique (combining the elastic recovery force of EDY to form a composite crimped morphology), then relaxing and heat-setting in a 178°C hot box (eliminating internal stress and stabilizing shrinkage properties), and then oiling with an oil containing an antistatic agent and a lubricant (reducing the friction coefficient and improving weaving processability), and finally winding the yarn to obtain the heterochromatic bamboo-jointed filament.

[0054] In the intertwining step, the heat treatment shrinkage of the pre-oriented yarn is controlled to be 10%, and the heat treatment shrinkage of the elastic polyester drawn yarn is controlled to be 8% (producing a fluffy effect); in the winding step, the bobbin winding tension is 0.14 cN / dtex, and the total bus density is 150 dtex.

[0055] Example 3

[0056] like Figure 1As shown, the present embodiment discloses a heterochromatic slub blended filament comprising a core and a sheath. The core is made of a bicomponent elastic polyester drawn yarn, and the sheath is made of a soft, heterochromatic slub pre-oriented yarn. The elastic drawn polyester yarn utilizes its high-low viscosity properties to produce a highly elastic, crimped structure through heat treatment and stretching. The ratio of the elastic drawn polyester yarn to the pre-oriented yarn is 1:2, and the sheath completely envelops the core.

[0057] The elastic polyester drawn yarn is made of polyester chips and polyurethane chips, with the weight percentage of polyester chips being 75% and the weight percentage of polyurethane chips being 25%; the pre-oriented yarn is prepared by modifying polyester chips with graphene, with the polyester chips being composed of any one of polytrimethylene terephthalate, polyethylene terephthalate or polybutylene terephthalate.

[0058] The pre-oriented yarn is prepared by a method comprising: feeding 1.3% graphene, 1.4% masterbatch, and 97.0% polyester chips, according to a weight ratio, into a screw extruder for extrusion, followed by ring blowing, oiling, and winding to obtain the pre-oriented yarn. The three-zone temperatures of the screw extruder are 255°C, 260°C, and 265°C, respectively; the spinning temperature is 268°C; the side-blowing temperature is 24°C, the side-blowing speed is 0.65 m / s, the relative humidity is 68%, the oil-water ratio is 22.5%, the oiling rate is 0.3%, and the winding speed is 3900 m / min. Prior to feeding the screw extruder, the raw materials for the pre-oriented yarn are dried under vacuum at 123°C for 9 hours to a moisture content of less than 30 ppm.

[0059] It is worth noting that the viscosity difference between the polyester chips and the polyurethane chips is 0.25 dL / g.

[0060] In this embodiment, the method for preparing the elastic polyester drawn yarn includes the following steps:

[0061] S1. Weigh polyester chips in proportion and dry them at 128° C. for 4.8 hours until the moisture content is less than 30 ppm. Weigh polyurethane chips in proportion and dry them at 88° C. under vacuum for 6 hours (to avoid moisture absorption affecting the stability of the blended melt) until the moisture content is less than 30 ppm.

[0062] S2, the dried polyester chips and polyurethane chips are fed together into a twin-screw extruder for extrusion (to achieve physical entanglement of polyester and polyurethane), followed by ring blowing, oiling, winding, bundling, two-stage stretching, false twisting and stretching, relaxation and heat setting, and cutting to obtain a blended yarn primary product;

[0063] Among them, the melt spinning temperature is 272°C, the side blowing temperature is 24°C, the side blowing speed is 0.7m / s, the relative humidity is 68%, the oil-water ratio is 22.5%, the oiling rate is 0.3%, the winding speed is 2100m / min, the first stretching temperature is 98°C, the first stretching ratio is 1.7, and the second stretching temperature is 176°C (preliminary improvement of molecular orientation); the second stretching ratio is 2.5; false twisting and stretching adopts a friction false twister with a D / Y ratio of 1.75, a first hot box temperature of 190°C, a second overfeed of 7.5%, a third overfeed of 8.2%, and a second hot box temperature of 180°C (relaxation heat setting to eliminate internal stress and stabilize fiber morphology); relaxation heat setting adopts a chain plate type relaxation heat setting machine, the drying zone temperature is 117°C, the heat setting zone temperature is 126°C, and the drying heat setting time is 18min.

[0064] The preparation method of the heterochromatic slubby blended filament comprises: taking elastic polyester drawn yarn and pre-oriented yarn, intertwining the elastic polyester drawn yarn and the pre-oriented yarn through airflow or mechanical network nozzle (forming heterogeneous shrinkage characteristics), then unevenly drawing the pre-oriented yarn using triangular drawing technology (combining with the elastic recovery force of EDY to form a composite crimped shape), then relaxing and heat-setting in a 176°C hot box (eliminating internal stress and stabilizing shrinkage performance), and then oiling with an oil containing an antistatic agent and a lubricant (reducing the friction coefficient and improving weaving processability), and finally winding to obtain the heterochromatic slubby blended filament;

[0065] 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 0.13 cN / dtex, and the total line density is 135 dtex.

[0066] Comparative Example 1

[0067] This comparative example discloses a different-color bamboo-jointed blended filament, which differs from Example 3 only in that the elastic polyester drawn filament is entirely composed of polyester chips.

[0068] Comparative Example 2

[0069] This comparative example discloses a different-color bamboo-jointed blended filament, which differs from Example 3 only in that the elastic polyester drawn filament is entirely composed of polyurethane chips.

[0070] Comparative Example 3

[0071] This comparative example discloses a different-color bamboo-jointed blended filament, which differs from Example 3 only in that the pre-oriented filament is not modified with graphene, and the proportion of graphene is replaced by a masterbatch of equal proportion.

[0072] Comparative Example 4

[0073] This comparative example discloses a heterochromatic slub blended filament, which differs from Example 3 only in that the ratio of the high-elastic polyester drawn yarn to the soft heterochromatic slub pre-oriented yarn is 1:3.

[0074] Comparative Example 5

[0075] This comparative example discloses a heterochromatic slub blended filament, which differs from Example 3 only in that the ratio of the high-elastic polyester drawn yarn to the soft heterochromatic slub pre-oriented yarn is 1:4.

[0076] Comparative Example 6

[0077] This comparative example discloses a heterochromatic slub blended filament, which differs from Example 3 only in that the ratio of the high-elastic polyester drawn yarn to the soft heterochromatic slub pre-oriented yarn is 1:5.

[0078] Comparative Example 7

[0079] This comparative example discloses a heterochromatic slub blended filament, which differs from Example 3 only in that the ratio of the high-elastic polyester drawn yarn to the soft heterochromatic slub pre-oriented yarn is 2:1.

[0080] Comparative Example 8

[0081] This comparative example discloses a heterochromatic slub blended filament, which differs from Example 3 only in that the ratio of the high-elastic polyester drawn yarn to the soft heterochromatic slub pre-oriented yarn is 3:1.

[0082] Comparative Example 9

[0083] This comparative example discloses a heterochromatic slub blended filament, which differs from Example 3 only in that the ratio of the high-elastic polyester drawn yarn to the soft heterochromatic slub pre-oriented yarn is 4:1.

[0084] The performance of the different-color bamboo-jointed mixed filaments obtained in Examples 1-3 and Comparative Examples 1-9 was tested according to 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 Thermal Shrinkage of Chemical Fiber Filaments." The test results are shown in Table 1:

[0085] Table 1

[0086]

[0087]

[0088] 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 embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A different-color bamboo-jointed blended filament, characterized by: It comprises a core and a sheath, wherein the core is made of bicomponent elastic polyester drawn yarn, and the sheath is made of soft, different-color bamboo pre-oriented yarn; The elastic polyester drawn yarn utilizes the characteristics of high and low viscosity to produce a high-elastic curled structure under heat treatment and stretching.

2. The different-color bamboo-jointed blended filament according to claim 1, characterized in that: The addition ratio of the elastic polyester drawn yarn to the pre-oriented yarn is 1:1 to 1:2, and the sheath layer completely wraps the core.

3. The different-color bamboo-jointed blended filament according to claim 2, characterized in that: The elastic polyester drawn yarn is made of polyester chips and polyurethane chips, the weight percentage of the polyester chips is 70% to 80%, and the weight percentage of the polyurethane chips is 20% to 30%; The pre-oriented yarn is prepared by modifying polyester chips with graphene, and the components of the polyester chips are any one of polypropylene terephthalate, polyethylene terephthalate or polybutylene terephthalate.

4. The different-color bamboo-jointed blended filament according to claim 3, characterized in that: The preparation method of the pre-oriented yarn comprises: weighing 1.2% to 1.5% of graphene, 0.8% to 2.0% of masterbatch and 96.5% to 98.0% of polyester chips according to a weight ratio, feeding the mixture into a screw extruder for extrusion, and then sequentially performing ring blowing, oiling and winding to obtain the pre-oriented yarn; Among them: the three zone temperatures of the screw extruder are 255℃, 260℃, and 265℃ respectively, the spinning temperature is 265℃~270℃, the side blowing temperature is 23℃~25℃, the side blowing speed is 0.5m / s~0.8m / s, the relative humidity is 67%~70%, the oil-water ratio is 22%~23%, the oiling rate is 0.3%~0.35%, and the winding speed is 3800m / min~4000m / min.

5. The different-color bamboo-jointed blended filament according to claim 4, characterized in that: The raw materials for preparing pre-oriented yarns need to be dried under vacuum conditions at 120°C to 125°C for 8 to 10 hours until the moisture content is less than 30 ppm.

6. The different-color bamboo-jointed blended filament according to claim 3, characterized in that: The viscosity difference between the polyester chips and the polyurethane chips is 0.25 dL / g.

7. The different-color bamboo-jointed blended filament according to claim 6, characterized in that: The preparation method of the elastic polyester drawn yarn comprises the following steps: S1. Weigh polyester chips in proportion and dry them at a temperature of 125°C to 130°C for 4.5 hours to 5 hours to a moisture content of less than 30 ppm. Weigh polyurethane chips in proportion and dry them at a vacuum temperature of 85°C to 90°C for 5 hours to 7 hours to a moisture content of less than 30 ppm. S2, feeding the dried polyester chips and polyurethane chips together into a twin-screw extruder for extrusion, and then sequentially undergoing ring blowing, oiling, winding, bundling, two-stage stretching, false twisting and stretching, relaxation and heat setting, and cutting to obtain a blended yarn primary product; The melt spinning temperature is 270℃~275℃, the side blowing temperature is 23℃~25℃, the side blowing speed is 0.6m / s~0.8m / s, the relative humidity is 67%~70%, the oil-water ratio is 22%~23%, the oiling rate is 0.3%~0.35%, the winding speed is 2000m / min~2200m / min, the first drawing temperature is 95℃~100℃, the first drawing ratio is 1.6~1.8, and the second drawing temperature is 175 ℃~178℃, second-stage draft ratio 2.0~3.0; false twist and stretching adopt friction type false twister, D / Y ratio 1.75, first hot box temperature 190℃, second overfeed 7.5%, third overfeed 8.2%, second hot box temperature 180℃; relaxation heat setting adopts chain plate type relaxation heat setting machine, drying zone temperature is 115℃~118℃, heat setting zone temperature is 125℃~128℃, drying heat setting time is 15min~20min.

8. The different-color bamboo-jointed mixed filament according to claim 7, characterized in that: The preparation method of the different-color bamboo-jointed blended filament comprises: taking elastic polyester drawn yarn and pre-oriented yarn, intertwining and combining the elastic polyester drawn yarn and the pre-oriented yarn through air flow or mechanical network nozzle, then unevenly drawing the pre-oriented yarn by using triangular drawing technology, then relaxing and heat-setting the pre-oriented yarn in a hot box at 175°C to 178°C, then oiling the pre-oriented yarn with an antistatic agent and a lubricant, and finally winding the pre-oriented yarn to obtain the different-color bamboo-jointed blended filament; In the intertwining step, the heat treatment shrinkage of the pre-oriented yarn is controlled to be 8% to 10%, and the heat treatment shrinkage of the elastic polyester drawn yarn is controlled to be 5% to 8%; in the winding step, the bobbin winding tension is 0.12 to 0.14 cN / dtex, and the total line density is 120 to 150 dtex.

9. A processing device for different-color bamboo mixed filaments according to any one of claims 1 to 8, characterized in that: It includes a screw extruder, a drawing machine, a crimping machine and a chain plate type relaxation and heat setting machine. The structure and operation principle of each machine are conventional means in the fiber textile field.

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