WO2021128749A1 - 用于针织的自卷曲弹性混纤丝的制备方法 - Google Patents

用于针织的自卷曲弹性混纤丝的制备方法 Download PDF

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Publication number
WO2021128749A1
WO2021128749A1 PCT/CN2020/095343 CN2020095343W WO2021128749A1 WO 2021128749 A1 WO2021128749 A1 WO 2021128749A1 CN 2020095343 W CN2020095343 W CN 2020095343W WO 2021128749 A1 WO2021128749 A1 WO 2021128749A1
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Prior art keywords
fiber
hole
spinneret
forming polymer
knitting
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PCT/CN2020/095343
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English (en)
French (fr)
Inventor
范红卫
汤方明
王山水
尹立新
王丽丽
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江苏恒力化纤股份有限公司
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Priority to US17/787,951 priority Critical patent/US11702768B2/en
Priority to KR1020217039344A priority patent/KR102458368B1/ko
Priority to JP2022534850A priority patent/JP7319470B2/ja
Publication of WO2021128749A1 publication Critical patent/WO2021128749A1/zh

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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
    • D01D5/30—Conjugate filaments; Spinnerette packs therefor
    • D01D5/32—Side-by-side structure; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
    • D01D10/02—Heat treatment
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/082—Melt spinning methods of mixed yarn
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/22—Formation of filaments, threads, or the like with a crimped or curled structure; with a special structure to simulate wool
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/12—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyamide as constituent
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/004—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by heating fibres, filaments, yarns or threads so as to create a temperature gradient across their diameter, thereby imparting them latent asymmetrical shrinkage properties
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/20—Combinations of two or more of the above-mentioned operations or devices; After-treatments for fixing crimp or curl
    • D02G1/205—After-treatments for fixing crimp or curl
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/32—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic
    • D02G3/326—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic the elastic properties due to the construction rather than to the use of elastic material
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
    • D02J1/229—Relaxing
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/06—Load-responsive characteristics
    • D10B2401/061—Load-responsive characteristics elastic

Definitions

  • the invention belongs to the technical field of polyester fibers, and relates to a preparation method of a self-crimping elastic mixed filament used for knitting.
  • Crimping is an important indicator of fiber, which affects the textile processing process and the characteristics and application performance of the final product.
  • the side-by-side bi-component composite fiber By changing the characteristics of the component polymer, the cross-sectional shape, the component distribution, the component ratio, the spinning draft and the heat setting process parameters, the side-by-side bi-component composite fiber with different properties can be obtained.
  • the side-by-side bi-component composite fiber has The advantages of designable performance and high application value, so it is favored and valued by the fiber manufacturing industry.
  • the three-dimensional spiral crimping of the two-component composite fiber allows it to be stretched under the action of external force, and it can well return to the original crimped form when the external force is removed.
  • the present invention provides a method for preparing self-crimped elastic mixed filament yarns for knitting.
  • the purpose is to solve the problem that the self-crimped elastic fibers used for knitting in the prior art will have random "strip unevenness" during the application process.
  • a part of the first fiber-forming polymer/second fiber-forming polymer side-by-side composite monofilament is "replaced" with the first fiber-forming polymer monofilament, which breaks the pure first fiber-forming polymer/first fiber-forming polymer monofilament.
  • the side-by-side composite fibers of two fiber-forming polymers form a neat left and right helix shape, which solves the problem of "striated unevenness in knitted fabrics made of the first fiber-forming polymer/second fiber-forming polymer side-by-side composite fiber. "The problem.
  • a method for preparing self-crimping elastic mixed fiber yarn for knitting, the self-crimping elastic mixed fiber yarn for knitting is extruded on the same spinneret;
  • the first fiber-forming polymer and the second fiber-forming polymer have compatibility or partial compatibility.
  • the ratio of the number of the spinneret holes m through which the direct extrusion flows to the number of the spinneret holes n through which the extrusion flows after being distributed in the parallel composite spinning mode is 1:5-10;
  • a self-crimping elastic mixed filament yarn for knitting is prepared according to a specific spinning process.
  • the specific spinning process is POY process, FDY process, POY-DTY process or POY-DT process.
  • POY process, FDY process After the end of the process and the POY-DT process, the fiber is also subjected to relaxation heat treatment.
  • the first fiber-forming polymer melt is split into two paths, one is directly extruded after being distributed, and the other is distributed and extruded together with the second fiber-forming polymer melt in a side-by-side composite spinning mode. “Replacement” is realized in the way out.
  • the number and positional relationship of the distribution holes and guide holes are set reasonably to ensure the smooth progress of the split; the present invention controls the direct extrusion flow through the spin hole m and the press
  • the ratio of the number of spinneret holes n extruded through the parallel composite spinning method ensures that the proportion of the replaced part to the whole is appropriate, which can effectively solve the problem of "uneven stripe” and maintain the first
  • the excellent performance of the fiber-forming polymer/second fiber-forming polymer side-by-side composite fiber; the present invention distributes the spinneret holes m and the spinneret holes n in concentric circles, and controls the spinneret holes m to be located as much as possible in the concentric circles.
  • the inner ring ensures that the first fiber-forming polymer monofilament can be fully incorporated into the first fiber-forming polymer/second fiber-forming polymer side-by-side composite fiber, which can break the pure first fiber-forming polymer/second fiber-forming polymer
  • the polymer side-by-side composite fiber forms a neat left and right spiral shape; the present invention sets the temperature of the spinning box III, the temperature of the first fiber-forming polymer melt spinning box I, and the second fiber-forming polymer melt
  • the temperature of the spinning box II enables it to cooperate with the intrinsic viscosity of the first fiber-forming polymer melt and the intrinsic viscosity of the second fiber-forming polymer melt to ensure the first fiber-forming extruded from the spinneret.
  • the apparent viscosity of the polymer component and the second fiber-forming polymer component are relatively close, thereby ensuring the smooth progress of the spinning; the present invention does not need to adjust the shape of the spinneret hole, and selects the commonly used single-component spinneret hole And the side-by-side composite spinneret hole is enough; the invention selects a specific spinning process, and the crimp shrinkage rate, crimp stability, shrinkage elongation rate, and crimp elastic recovery rate of the prepared product are higher, and the mechanical properties are at the same time good.
  • the self-crimping elastic mixed filament yarn for knitting in the present invention is composed of a first fiber-forming polymer monofilament and a first fiber-forming polymer/second fiber-forming polymer side-by-side composite monofilament, and the corresponding two types of fiber-forming polymer monofilaments
  • the thermal shrinkage rate of the polymers is different; after the two are mixed, the relationship between the glass transition temperature of the two polymers is: the glass transition temperature of the mixed polymer is lower than the glass transition temperature of the polymer and the glass transition Between high temperature polymers, this indicates that the two polymers with different heat shrinkage rates used in the present invention have compatibility or partial compatibility.
  • the existence of compatibility allows the polymers to pass through the same spinneret hole ( That is to say, the two fiber-forming polymer melts can be bonded together after being distributed according to the parallel composite spinning method. This bonding effect and the aforementioned different heat shrinkage rate effects together make it from the same spinneret
  • the two polymer fibers that is, the first fiber-forming polymer/the second fiber-forming polymer side-by-side composite monofilament
  • the two polymer fibers can be formed into a self-crimped form after relaxation heat treatment, thereby having elasticity.
  • the present invention divides the first fiber-forming polymer melt into two paths: one path is distributed with the second fiber-forming polymer melt in a side-by-side composite spinning mode and then extruded.
  • the other route is distributed and then directly extruded to form the first fiber-forming polymer monofilament after extrusion, and the ratio of the number of spinneret holes corresponding to the two routes is 1:5-10,
  • the presence of the monofilament plays a role in breaking the pure first fiber-forming polymer/second fiber-forming polymer side-by-side composite monofilament to form a neat left and right spiral morphology, making the self-crimping elastic mixed fiber yarn for knitting prepared After the relaxation heat treatment, the crimping direction of the monofilament is randomly distributed; therefore, the surface of the knitted fabric woven from the self-crimping elastic mixed filament yarn does not appear random "striated unevenness".
  • the self-crimping elastic mixed filament yarn for knitting of the present invention is crimped in a three-dimensional spiral shape in the longitudinal direction, and the three-dimensional crimping can make the fabric have good bulkiness, elasticity, extensibility and soft hand feeling, and irregular spiral crimping. It will make the fabric have good moisture permeability.
  • the mass ratio of the first fiber-forming polymer melt to the second fiber-forming polymer melt passing through the spinneret hole n is 50 ⁇ 50, the ratio of the equivalent diameter of the spinneret hole m to the spinneret hole n is 1:1;
  • the first fiber-forming polymer and the second fiber-forming polymer are made of the same material and have different viscosities, or the first fiber-forming polymer and
  • the material of the second fiber-forming polymer is different, and there must be a difference in thermal shrinkage between polymers that meet these two conditions.
  • the fiber After relaxation and heat treatment, the fiber can form a self-crimped form; the first fiber-forming polymer and the second
  • the material of the two fiber-forming polymer is selected from polyester homopolymer (such as PET, PBT, PTT), polyester copolymer (such as PET-PBT, PET-PTT, PET-PEG, PET-PTMG, PBT-PTT) , Polyester modified products (such as CDP, ECDP, hydrophilic PET, dyed PET), polyamide homopolymers (such as PA6, PA66), polyamide copolymers (such as PA6-PBT, PA6-PTT) and polyamides Modified products (such as PA6-11, PA6-PET).
  • polyester homopolymer such as PET, PBT, PTT
  • polyester copolymer such as PET-PBT, PET-PTT, PET-PEG, PET-PTMG, PBT-PTT
  • Polyester modified products such as CDP, ECDP, hydrophilic PET, dyed PET
  • polyamide homopolymers
  • the spinneret hole m is circular, oval, triangular, Y-shaped, cross-shaped, "8"-shaped, rectangular or in-line spinneret Hole
  • spinneret hole n is round, oval or "8" shaped spinneret hole.
  • the method for preparing self-crimping elastic mixed filament yarn for knitting as described above all the spinneret holes are distributed in concentric circles, the spinneret holes on the same circle are all m or all n, the outermost circle The upper spinneret holes are all n, so as to ensure that the first fiber-forming polymer monofilament is mixed into the first fiber-forming polymer/second fiber-forming polymer side-by-side composite monofilament, which breaks and forms a neat left and right spiral form Otherwise, more first fiber-forming polymer monofilaments are distributed in the outermost circle, which will make the inner first fiber-forming polymer/second fiber-forming polymer side-by-side composite monofilament still have neat left and right Spiral shape.
  • the spinneret hole m is composed of a sequentially connected guide hole E, a transition hole and a capillary micropore
  • the spinneret hole n is composed of a sequentially connected guide hole D. Transition holes and capillary micro holes are formed.
  • Guide hole E is connected with distribution hole A
  • guide hole D is connected with distribution hole B and distribution hole C at the same time
  • distribution hole A, distribution hole B and distribution hole C are located in spinning box III In the distribution plate
  • the shunt is to transport the first fiber-forming polymer melt through the spinning box I to the distribution hole A and the distribution hole B, while the second fiber-forming polymer melt through the spinning box II is delivered to the distribution hole C.
  • the difference between the apparent viscosity of the first fiber-forming polymer melt and the second fiber-forming polymer melt is no more than 5 %.
  • the apparent viscosity of the melt is close (for the same polymer, the greater the apparent viscosity , The flowability is worse); the apparent viscosity of the first fiber-forming polymer and the second fiber-forming polymer can be adjusted by temperature.
  • the present invention sets the temperature of the spinning box III and the melt of the first fiber-forming polymer reasonably.
  • the temperature of the spinning box I and the temperature of the second fiber-forming polymer melt spinning box II make it possible to interact with the intrinsic viscosity of the first fiber-forming polymer melt and the intrinsic viscosity of the second fiber-forming polymer melt.
  • the first fiber-forming polymer adopts high-temperature melting and low-temperature spinning
  • the second fiber-forming polymer adopts low-temperature melting and high-temperature spinning, which can reduce the degradation of the second fiber-forming polymer, even though the two components are in the box.
  • the temperature of the first fiber-forming polymer component decreases, and the temperature of the second fiber-forming polymer component increases.
  • the apparent viscosities of the two components in the hole extrusion are close to the same, which can ensure the smooth progress of the spinning.
  • the temperature of the relaxation heat treatment is 90-120 DEG C, and the time is 20-30 min.
  • the self-crimping elastic mixed fiber yarn for knitting prepared by the method for preparing a self-crimping elastic mixed fiber yarn for knitting as described in any one of the above is mainly composed of a first fiber-forming polymer monofilament and a first fiber-forming polymer monofilament.
  • the fiber-forming polymer/second fiber-forming polymer is composed of parallel composite monofilaments; the self-crimping elastic mixed filament used for knitting is randomly distributed in the crimping direction of the monofilament after relaxation heat treatment. Random distribution is a mathematical concept, that is, the size of each fiber The crimp shape is different from other fibers, so that the fabric produced does not have uneven unevenness.
  • the method for preparing self-crimped elastic mixed filament yarn for knitting of the present invention is composed of a first fiber-forming polymer monofilament and a first fiber-forming polymer/second fiber-forming polymer side-by-side composite monofilament
  • the self-crimped elastic mixed filament yarn used for knitting cannot form a regular arrangement of spiral crimps, which can solve the problem of "strip-shaped unevenness formed by the first fiber-forming polymer/second fiber-forming polymer side-by-side composite fiber in the knitted fabric.
  • the preparation method of the self-crimping elastic mixed filament yarn for knitting of the present invention has a wide application range and good promotion value.
  • Figure 1 is a schematic diagram of the structure of the spinneret of the present invention.
  • A, B, and C are independent distribution holes, and D and E are independent guide holes.
  • the crimp shrinkage rate and crimp stability of the present invention are obtained by testing the tow using GB6506-2001 "Test Method for Crimp Performance of Synthetic Fiber Textured Yarn";
  • the shrinkage elongation (reflecting the elasticity and crimp degree of the deformed yarn, the fiber first bears a light load and then a heavy load, calculates the ratio of the length difference under the two loads to the crimp length) and the crimp elastic recovery rate test methods are as follows:
  • CE (l 2 -l 1 )/l 1 ;
  • a self-crimping elastic mixed filament used for knitting, the preparation process is as follows:
  • the ratio of the number of circular spinneret holes m through which the direct extrusion flows through to the number of circular spinneret holes n through which the extrusion flows after being distributed in the parallel compound spinning mode is 1:6 ,
  • the ratio of the equivalent diameter of the spinneret hole m to the spinneret hole n is 1:1, and the mass ratio of the PET melt passing through the spinneret hole n to the PTT melt is 50:50;
  • all the spinneret holes are concentric Circle distribution, the spinneret holes on the same circle are all m or all n, and the spinneret holes on the outermost circle are all n;
  • the spinneret hole m is composed of a sequentially connected guide hole E, transition hole and capillary micropores
  • the spinneret hole n is composed of a serially connected guide hole D, transition hole and capillary micropores.
  • the guide hole E and The distribution hole A is connected, and the guide hole D is connected with the distribution hole B and the distribution hole C at the same time; the distribution hole A, the distribution hole B and the distribution hole C are located on the distribution plate in the spinning box III;
  • the PTT melt is transported to the distribution hole A and the distribution hole B through the spinning box I, and the PTT melt is transported to the distribution hole C through the spinning box II;
  • the temperature of the spinning box I is 276°C
  • the temperature of the spinning box II The temperature is 260°C, and the temperature of the spinning box III is 275°C;
  • the POY yarn is prepared according to the POY process, and then the DT yarn is made by the DT drawing process and then subjected to relaxation heat treatment to obtain the self-crimping elastic mixed filament yarn for knitting;
  • the parameters of the POY process are: the cooling temperature is 24°C, the winding speed is 2580m/min; the parameters of the DT stretching process are: the hot plate temperature is 85°C, the hot plate temperature is 120°C, and the multiple is 1.6; the relaxation heat treatment temperature is 109°C, and the time Is 26min;
  • the self-crimping elastic mixed filament used for knitting is composed of PET monofilament and PTT/PET side-by-side composite monofilament.
  • the crimping direction of the monofilament is randomly distributed in the self-crimping elastic mixed filament used for knitting; the self-crimping elastic mixed filament used for knitting
  • the crimp shrinkage rate of the filament is 69%, the crimp stability is 94%, the shrinkage elongation rate is 111%, and the crimp elastic recovery rate is 83%;
  • the breaking strength of the self-crimped elastic mixed filament used for knitting is 3.2cN /dtex, the elongation at break is 46.5%, and the total fineness is 130 dtex.
  • a self-crimping elastic mixed filament used for knitting, the preparation process is as follows:
  • the ratio of the number of elliptical spinneret holes m through which the direct extrusion flows to the number of elliptical spinneret holes n through which the extrusion flows through the parallel compound spinning mode is 1:10 ,
  • the ratio of the equivalent diameter of the spinneret hole m to the spinneret hole n is 1:1, and the mass ratio of the PET melt passing through the spinneret hole n to the PTT melt is 50:50;
  • all the spinneret holes are concentric Circle distribution, the spinneret holes on the same circle are all m or all n, and the spinneret holes on the outermost circle are all n;
  • the spinneret hole m is composed of a sequentially connected guide hole E, transition hole and capillary pores.
  • the spinneret hole n is composed of a serially connected guide hole D, transition hole and capillary pore.
  • the guide hole E is connected with the distribution hole A and the guide Hole D is connected to distribution hole B and distribution hole C at the same time; distribution hole A, distribution hole B, and distribution hole C are located on the distribution plate in spinning box III; the shunt is to pass PET melt through spinning box I
  • the PTT melt is transported to the distribution hole A and the distribution hole B, and the PTT melt is transported to the distribution hole C through the spinning box II; the temperature of the spinning box I is 280°C, and the temperature of the spinning box II is 265°C.
  • the temperature of the wire box III is 273°C;
  • the POY yarn is prepared according to the POY process, and then the DT yarn is made by the DT drawing process and then subjected to relaxation heat treatment to obtain the self-crimping elastic mixed filament yarn for knitting;
  • the parameters of the POY process are: cooling temperature 25°C, winding speed 2550m/min; DT stretching process parameters: hot plate temperature 85°C, hot plate temperature 124°C, multiple 1.8; relaxation heat treatment temperature 115°C, time 22min;
  • the self-crimping elastic mixed filament used for knitting is composed of PET monofilament and PTT/PET side-by-side composite monofilament.
  • the crimping direction of the monofilament is randomly distributed in the self-crimping elastic mixed filament used for knitting; the self-crimping elastic mixed filament used for knitting
  • the crimp shrinkage rate of the filament is 66%, the crimp stability is 93%, the shrinkage elongation rate is 112%, and the crimp elastic recovery rate is 84%;
  • the breaking strength of the self-crimped elastic mixed filament used for knitting is 3.1cN /dtex, the elongation at break is 48.3%, and the total fineness is 115 dtex.
  • a self-crimping elastic mixed filament used for knitting, the preparation process is as follows:
  • the ratio of the number of triangle spinneret holes m directly extruded through to the number of "8"-shaped spinneret holes n extruded through the parallel compound spinning mode is 1: 5.
  • the ratio of the equivalent diameter of the spinneret hole m to the spinneret hole n is 1:1, and the mass ratio of the PET melt passing through the spinneret hole n to the PTT melt is 50:50; all the spinneret holes are Concentrically distributed, the spinneret holes on the same circle are all m or all are n, and the spinneret holes on the outermost circle are all n;
  • the spinneret hole m is composed of a sequentially connected guide hole E, transition hole and capillary pores.
  • the spinneret hole n is composed of a serially connected guide hole D, transition hole and capillary pore.
  • the guide hole E is connected with the distribution hole A and the guide Hole D is connected to distribution hole B and distribution hole C at the same time; distribution hole A, distribution hole B, and distribution hole C are located on the distribution plate in spinning box III;
  • the shunt is to pass PET melt through spinning box I Transport to the distribution hole A and distribution hole B, while the PTT melt is transported to the distribution hole C through the spinning box II;
  • the temperature of the spinning box I is 278 °C, the temperature of the spinning box II is 264 °C,
  • the temperature of the wire box III is 275°C;
  • the POY yarn is prepared according to the POY process, and then the DT yarn is made by the DT drawing process and then subjected to relaxation heat treatment to obtain the self-crimping elastic mixed filament yarn for knitting;
  • the parameters of the POY process are: cooling temperature 24°C, winding speed 2640m/min; DT stretching process parameters: hot plate temperature 88°C, hot plate temperature 126°C, multiple 1.8; relaxation heat treatment temperature 120°C, time 20min;
  • the self-crimping elastic mixed filament used for knitting is composed of PET monofilament and PTT/PET side-by-side composite monofilament.
  • the crimping direction of the monofilament is randomly distributed in the self-crimping elastic mixed filament used for knitting; the self-crimping elastic mixed filament used for knitting
  • the crimp shrinkage rate of the filament is 69%, the crimp stability is 93.8%, the shrinkage elongation rate is 113%, and the crimp elastic recovery rate is 84%;
  • the breaking strength of the self-crimped elastic mixed filament used for knitting is 3.3cN /dtex, the elongation at break is 49.2%, and the total fineness is 125 dtex.
  • a self-crimping elastic mixed filament used for knitting The process is as follows:
  • the ratio of the number of circular spinneret holes m through which the direct extrusion flows to the number of circular spinneret holes n through which the extrusion flows after being distributed in the parallel compound spinning mode is 1:8;
  • the mass ratio of the high-viscosity PET melt to the low-viscosity PET melt is 50:50, and the ratio of the equivalent diameter of the spinneret hole m to the spinneret hole n is 1:1;
  • spinneret holes are distributed in concentric circles, the spinneret holes on the same circle are all m or all n, and the spinneret holes on the outermost circle are all n;
  • the spinneret hole m is composed of a sequentially connected guide hole E, transition hole and capillary pores.
  • the spinneret hole n is composed of a serially connected guide hole D, transition hole and capillary pore.
  • the guide hole E is connected with the distribution hole A and the guide Hole D is connected to distribution hole B and distribution hole C at the same time; distribution hole A, distribution hole B and distribution hole C are located on the distribution plate in spinning box III; the shunt is to pass the high-viscosity PET melt through the spinning box
  • the body I is conveyed to the distribution hole A and the distribution hole B, and the low-viscosity PET melt is conveyed to the distribution hole C through the spinning box II; the temperature of the spinning box I is 286°C, and the temperature of the spinning box II is 275°C, the temperature of spinning box III is 283°C;
  • FDY filaments are made into FDY filaments according to the FDY process and then subjected to relaxation heat treatment to obtain self-crimped elastic mixed filament yarns for knitting;
  • the parameters of FDY process are: cooling temperature 25°C, network pressure 0.2MPa, one roll speed 2300m/min, one roll temperature 85°C, two roll speed 3560m/min, two roll temperature 150°C, winding speed 3460m/min; relaxation The heat treatment temperature is 104°C, and the time is 30min;
  • the prepared self-crimping elastic mixed filament yarn for knitting is composed of high-viscosity PET monofilament and high-viscosity PET/low-viscosity PET side-by-side composite monofilament; in the self-crimping elastic mixed filament used for knitting, the crimping direction of the monofilament is random Distribution; the crimp shrinkage rate of the self-crimped elastic mixed filament used for knitting is 53%, the crimp stability is 87%, the shrinkage elongation is 98%, and the crimp elastic recovery rate is 96%; the self-crimping for knitting The breaking strength of the elastic mixed filament yarn is 3.1 cN/dtex, the elongation at break is 45%, and the total fineness is 130 dtex.
  • the self-crimping elastic mixed filament yarn for knitting prepared above was made into a knitted fabric, and the unevenness of the strips of the knitted fabric was tested. The D value of the fabric was 0.51.
  • a self-crimping elastic mixed filament used for knitting The process is as follows:
  • the ratio of the number of elliptical spinneret holes m through which the direct extrusion flows to the number of circular spinneret holes n through which the extrusion flows after being distributed according to the parallel compound spinning mode is 1:6; passing through the spinneret holes n
  • the mass ratio of the high-viscosity PET melt to the low-viscosity PET melt is 50:50, and the ratio of the equivalent diameter of the spinneret hole m to the spinneret hole n is 1:1;
  • spinneret holes are distributed in concentric circles, the spinneret holes on the same circle are all m or all n, and the spinneret holes on the outermost circle are all n;
  • the spinneret hole m is composed of a sequentially connected guide hole E, transition hole and capillary pores.
  • the spinneret hole n is composed of a serially connected guide hole D, transition hole and capillary pore.
  • the guide hole E is connected with the distribution hole A and the guide Hole D is connected to distribution hole B and distribution hole C at the same time; distribution hole A, distribution hole B and distribution hole C are located on the distribution plate in spinning box III; the shunt is to pass the high-viscosity PET melt through the spinning box
  • the body I is conveyed to the distribution hole A and the distribution hole B, and the low-viscosity PET melt is conveyed to the distribution hole C through the spinning box II; the temperature of the spinning box I is 282°C, and the temperature of the spinning box II is 271°C, the temperature of spinning box III is 278°C;
  • FDY filaments are made into FDY filaments according to the FDY process and then subjected to relaxation heat treatment to obtain self-crimped elastic mixed filament yarns for knitting;
  • the parameters of FDY process are: cooling temperature 20°C, network pressure 0.25MPa, one roll speed 2350m/min, one roll temperature 95°C, two roll speed 3660m/min, two roll temperature 160°C, winding speed 3530m/min; relaxation
  • the heat treatment temperature is 103°C, and the time is 28min;
  • the prepared self-crimping elastic mixed filament yarn for knitting is composed of high-viscosity PET monofilament and high-viscosity PET/low-viscosity PET side-by-side composite monofilament; in the self-crimping elastic mixed filament used for knitting, the crimping direction of the monofilament is random Distribution; the crimp shrinkage rate of the self-crimped elastic mixed filament used for knitting is 52.8%, the crimp stability is 85%, the shrinkage elongation rate is 95%, and the crimp elastic recovery rate is 95.4%; the self-crimping used for knitting The breaking strength of the elastic mixed filament yarn is 3.1 cN/dtex, the elongation at break is 44.2%, and the total fineness is 115 dtex.
  • the self-crimping elastic mixed filament yarn for knitting prepared above was made into a knitted fabric, and the unevenness of the strips of the knitted fabric was tested. The D value of the fabric was 0.39.
  • a self-crimping elastic mixed filament used for knitting The process is as follows:
  • the ratio of the number of triangular spinneret holes m through which the direct extrusion flows and the number of circular spinneret holes n through which the extrusion flows after being distributed in the parallel compound spinning mode is 1:8;
  • the mass ratio of the high-viscosity PET melt to the low-viscosity PET melt is 50:50, and the ratio of the equivalent diameter of the spinneret hole m to the spinneret hole n is 1:1;
  • spinneret holes are distributed in concentric circles, the spinneret holes on the same circle are all m or all n, and the spinneret holes on the outermost circle are all n;
  • the spinneret hole m is composed of a sequentially connected guide hole E, transition hole and capillary pores.
  • the spinneret hole n is composed of a serially connected guide hole D, transition hole and capillary pore.
  • the guide hole E is connected with the distribution hole A and the guide Hole D is connected to distribution hole B and distribution hole C at the same time; distribution hole A, distribution hole B and distribution hole C are located on the distribution plate in spinning box III; the shunt is to pass the high-viscosity PET melt through the spinning box
  • the body I is conveyed to the distribution hole A and the distribution hole B, and the low-viscosity PET melt is conveyed to the distribution hole C through the spinning box II; the temperature of the spinning box I is 283°C, and the temperature of the spinning box II is 275°C, the temperature of spinning box III is 279°C;
  • FDY yarn is made into FDY yarn according to the FDY process and then subjected to relaxation heat treatment to obtain a self-crimping elastic mixed filament yarn for knitting;
  • the parameters of FDY process are: cooling temperature 21°C, network pressure 0.23MPa, one roll speed 2300m/min, one roll temperature 86°C, two roll speed 3500m/min, two roll temperature 151°C, winding speed 3430m/min; relaxation
  • the heat treatment temperature is 120°C, and the time is 29min;
  • the prepared self-crimping elastic mixed filament yarn for knitting is composed of high-viscosity PET monofilament and high-viscosity PET/low-viscosity PET side-by-side composite monofilament; in the self-crimping elastic mixed filament used for knitting, the crimping direction of the monofilament is random Distribution; the crimp shrinkage rate of the self-crimped elastic mixed filament used for knitting is 52%, the crimp stability is 85.5%, the shrinkage elongation rate is 96%, and the crimp elastic recovery rate is 95.1%; the self-crimping used for knitting The breaking strength of the elastic mixed filament yarn is 3 cN/dtex, the elongation at break is 46%, and the total fineness is 125 dtex.
  • the self-crimping elastic mixed filament yarn for knitting prepared above was made into a knitted fabric, and the unevenness of the strips of the knitted fabric was tested. The D value of the fabric was 0.68.
  • the preparation method of self-crimping elastic mixed fiber yarn for knitting, the process is as follows:
  • the mass ratio of the PBT melt passing through the spinneret n to the PTT melt is 50:50, and the ratio of the equivalent diameter of the spinneret m to the spinneret n is 1:1;
  • the spinneret m is Circular spinneret hole, the spinneret hole n is a circular spinneret hole;
  • the spinneret hole m through which the direct extrusion flows and the spinneret hole n through which the extrusion flows through are distributed according to the parallel compound spinning method are different
  • the quantity ratio is 1:6;
  • the spinneret hole m is composed of a sequentially connected guide hole E, transition hole and capillary pores.
  • the spinneret hole n is composed of a serially connected guide hole D, transition hole and capillary pore.
  • the guide hole E is connected with the distribution hole A and the guide Hole D is connected with distribution hole B and distribution hole C at the same time; distribution hole A, distribution hole B and distribution hole C are located on the distribution plate in spinning box III; the shunt is to pass PBT melt through spinning box I
  • the PTT melt is transported to the distribution hole A and the distribution hole B, and the PTT melt is transported to the distribution hole C through the spinning box II; the temperature of the spinning box I is 269°C, and the temperature of the spinning box II is 272°C.
  • the temperature of the filament box III is 279°C; all the spinneret holes are distributed in concentric circles, the spinneret holes on the same circle are all m or all are n, and the spinneret holes on the outermost circle are all n;
  • the self-crimped elastic mixed filament yarn for knitting is prepared according to the POY-DTY process;
  • the parameters of the POY process are: cooling temperature 24°C, network pressure 0.2MPa, winding speed 2800m/min; DTY
  • the parameters of the process are: spinning speed 750m/min, setting overfeed rate 3.5%, winding overfeed rate 3%, one hot box temperature 200°C, two hot box temperature 173°C, draw ratio 1.5, D/Y value 1.9, the network pressure is 0.05MPa;
  • the prepared self-crimping elastic mixed filament yarn for knitting is composed of PBT monofilament and PBT/PTT parallel composite monofilament, and the crimping direction of monofilament is randomly distributed;
  • the PBT/PET two-component elastic yarn with random distribution of monofilament crimp direction was selected for testing, and the crimp shrinkage rate was 65%, crimp stability was 85%, and the shrinkage elongation rate was 108%.
  • the elastic recovery rate is 98%; the breaking strength is 27 cN/dtex, the breaking elongation is 49%, and the total fineness is 200 dtex.
  • a method for preparing self-crimped elastic mixed fiber yarn for knitting is basically the same as that of Example 7. The difference is that the PBT melt is not split into two paths during spinning, but all is the same as the PTT melt. They are distributed together in a side-by-side composite spinning method and then extruded; therefore, there is no PTT monofilament in the self-crimped elastic mixed filament yarn for knitting.
  • the self-crimping elastic mixed filament yarns for knitting produced in Comparative Example 1 and Example 7 were respectively used for plain knitted fabrics woven by a seamless circular knitting machine to test the unevenness of the two kinds of plain knitted fabrics.
  • the testing process of each plain knitted fabric is: first collect the plain knitted fabric image and convert it into a gray image, and then calculate the parameter D after the first and second processing of the gray image, which is characterized by the parameter D
  • the degree of streak unevenness, in which the grayscale image includes the streak shade area, the high gray value area of the non-stripe shade area, and the low gray value area of the non-stripe shade area; the first processing will be the grayscale image.
  • the pixel points in the high gray value area of the bar shadow area become pure white points; the second processing is to turn the pixels in the low gray value area of the non-bar shadow area in the grayscale image into pure white points; calculation of parameter D
  • the D value of the plain knitted fabric made from the self-crimping elastic mixed filament yarn for knitting in Example 7 is 0.7%; the self-crimping elastic mixed filament yarn for knitting in Comparative Example 1 has a D value of 0.7%.
  • the D value of the finished jersey knitted fabric is 16.8%; this shows that the jersey knitted fabric woven with the self-crimped elastic mixed filament yarn used for knitting in Example 7 has reduced unevenness in the strips, which is because of the embodiment. ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
  • Part 7 replaces part of PBT/PTT side-by-side composite monofilament with part of PBT monofilament, thereby breaking the neat left and right spiral morphology of pure PBT/PTT two-component composite fiber; making each PBT/PTT side-by-side composite monofilament have a different crimp shape
  • the fabric surface will not show uneven unevenness; while the plain knitted fabrics made from the self-crimping elastic mixed filament yarn used for knitting in Comparative Example 1 are due to the fiber
  • the preparation method of self-crimping elastic mixed fiber yarn for knitting, the process is as follows:
  • the mass ratio of the PBT melt passing through the spinneret n to the PTT melt is 50:50, and the ratio of the equivalent diameter of the spinneret m to the spinneret n is 1:1;
  • the spinneret m is Circular spinneret hole, the spinneret hole n is an elliptical spinneret hole;
  • the spinneret hole m through which the direct extrusion flows and the spinneret hole n through which the extrusion flows through are distributed according to the parallel composite spinning method are different
  • the quantity ratio is 1:7;
  • the spinneret hole m is composed of a sequentially connected guide hole E, transition hole and capillary micropores
  • the spinneret hole n is composed of a sequentially connected guide hole D, transition hole and capillary micropores
  • the guide hole E is connected with the distribution hole A.
  • the guide hole D is connected with the distribution hole B and the distribution hole C at the same time; the distribution hole A, the distribution hole B and the distribution hole C are located on the distribution plate in the spinning box body III; the split is to pass the PBT melt through the spinning box
  • the body I is conveyed to the distribution hole A and the distribution hole B, and the PTT melt is conveyed to the distribution hole C through the spinning box II; the temperature of the spinning box I is 272°C, and the temperature of the spinning box II is 275°C , The temperature of the spinning box III is 276°C; all the spinneret holes are distributed in concentric circles, the spinneret holes on the same circle are all m or all n, and the spinneret holes on the outermost circle are all n ;
  • the self-crimping elastic mixed fiber yarn for knitting is prepared according to the POY-DTY process;
  • the parameters of the POY process are: cooling temperature 25°C, network pressure 0.21MPa, winding speed 3000m/min; DTY
  • the parameters of the process are: spinning speed 800m/min, setting overfeed rate 3.8%, winding overfeed rate 3.3%, one hot box temperature 220°C, two hot box temperature 180°C, draw ratio 1.9, D/Y value 2.2, the network pressure is 1.5MPa;
  • the prepared self-crimping elastic mixed filament yarn for knitting is composed of PBT monofilament and PBT/PTT parallel composite monofilament, and the crimping direction of monofilament is randomly distributed;
  • the PBT/PET bi-component elastic yarn with random distribution of monofilament crimp direction was selected for testing, and the crimp shrinkage rate was 61%, crimp stability was 86%, and the shrinkage elongation rate was 108%.
  • the elastic recovery rate is 97%; the breaking strength is 25 cN/dtex, the breaking elongation is 55%, and the total fineness is 105 dtex.
  • the preparation method of self-crimping elastic mixed fiber yarn for knitting, the process is as follows:
  • the spinneret hole m is composed of a sequentially connected guide hole E, transition hole and capillary micropores
  • the spinneret hole n is composed of a sequentially connected guide hole D, transition hole and capillary micropores
  • the guide hole E is connected with the distribution hole A.
  • the guide hole D is connected with the distribution hole B and the distribution hole C at the same time; the distribution hole A, the distribution hole B and the distribution hole C are located on the distribution plate in the spinning box body III; the split is to pass the PBT melt through the spinning box
  • the body I is conveyed to the distribution hole A and the distribution hole B, and the PTT melt is conveyed to the distribution hole C through the spinning box II; the temperature of the spinning box I is 269°C, and the temperature of the spinning box II is 276°C , The temperature of the spinning box III is 276°C; all the spinneret holes are distributed in concentric circles, the spinneret holes on the same circle are all m or all n, and the spinneret holes on the outermost circle are all n ;
  • the self-crimping elastic mixed filament yarn for knitting is prepared according to the POY-DTY process;
  • the parameters of the POY process are: cooling temperature 24°C, network pressure 0.22MPa, winding speed 3100m/min; DTY
  • the parameters of the process are: spinning speed 770m/min, setting overfeed rate 4.5%, winding overfeed rate 3.9%, one hot box temperature 178°C, two hot box temperature 130°C, draw ratio 1.5, D/Y value 1.8, network pressure 1.4MPa;
  • the prepared self-crimping elastic mixed filament yarn for knitting is composed of PBT monofilament and PBT/PTT parallel composite monofilament, and the crimping direction of monofilament is randomly distributed;
  • the PBT/PET two-component elastic yarn with random distribution of monofilament crimping direction prepared above was selected for testing, and the crimp shrinkage rate was 65%, crimp stability was 87%, and the shrinkage elongation rate was 110%.
  • the elastic recovery rate is 98%; the breaking strength is 26cN/dtex, the breaking elongation is 50%, and the total fineness is 120dtex.
  • the preparation method of self-crimping elastic mixed filament used for knitting, the preparation process is as follows:
  • the self-crimping elastic mixed filament used for knitting is extruded on the same spinneret; specifically:
  • the PET melt (intrinsic viscosity is 0.5dL/g) is divided into two paths: one is directly extruded after being distributed; the other is with PET-PA6 copolymer melt (intrinsic viscosity is 0.65dL/g, and it is in the hole
  • the mass ratio of the PET melt is 50:50). It is extruded after being distributed together according to the parallel composite spinning method;
  • the ratio of the number of spinneret holes m (circular) through which the direct extrusion flows through and the number of spinneret holes n (circular) through which the extrusion flows after being distributed in the parallel composite spinning mode is 1:7;
  • the ratio of the equivalent diameter of the filament hole m to the spinneret hole n is 1:1; all the spinneret holes are distributed in concentric circles, and the spinneret holes on the same circle are all m or all n.
  • Spinning holes are all n;
  • the spinneret hole m is composed of a sequentially connected guide hole E, transition hole and capillary pores.
  • the spinneret hole n is composed of a serially connected guide hole D, transition hole and capillary pore.
  • the guide hole E is connected with the distribution hole A and the guide Hole D is connected to distribution hole B and distribution hole C at the same time; distribution hole A, distribution hole B, and distribution hole C are located on the distribution plate in spinning box III; the shunt is to pass PET melt through spinning box I Transport to the distribution hole A and the distribution hole B, and at the same time transport the PET-PA6 copolymer melt to the distribution hole C through the spinning box II;
  • FDY filaments are made into FDY filaments according to the FDY process and then subjected to relaxation heat treatment to obtain self-crimped elastic mixed filament yarns for knitting;
  • the parameters of the FDY process are: the temperature of the spinning box I is 282°C, the temperature of the spinning box II is 274°C, the temperature of the spinning box III is 280°C, the cooling temperature is 25°C, and the network pressure is 0.2MPa , One roll speed 2300m/min, one roll temperature 70°C, two roll speed 3560m/min, two roll temperature 125°C, winding speed 3480m/min; relaxation heat treatment temperature is 104°C, time is 30min;
  • the prepared self-crimping elastic mixed filament for knitting is composed of PET monofilament and PET/PET-PA6 copolymer side-by-side composite monofilament; the crimping direction of the monofilament in the self-crimping elastic mixed filament for knitting is randomly distributed;
  • the crimping shrinkage rate of the self-crimping elastic mixed filament used for knitting is 53%, the crimping stability is 87%, the shrinkage elongation is 90%, and the crimping elastic recovery rate is 93%; the self-crimping elasticity for knitting
  • the breaking strength of the mixed fiber yarn is 3.4 cN/dtex, the elongation at break is 45%, and the total fineness is 130 dtex.
  • the self-crimping elastic mixed filament yarn used for knitting prepared above was made into a knitted fabric, and the unevenness of the knitted fabric was tested.
  • the D of the knitted fabric made of the self-crimping elastic mixed filament yarn used for knitting was tested. The value is 0.54%.
  • the preparation method of self-crimping elastic mixed filament used for knitting, the preparation process is as follows:
  • the self-crimping elastic mixed filament used for knitting is extruded on the same spinneret; specifically:
  • the PET melt (intrinsic viscosity is 0.56dL/g) is divided into two paths: one is directly extruded after distribution; the other is with PET-PA6 copolymer melt (intrinsic viscosity is 0.63dL/g, and it is in the hole
  • the mass ratio of the PET melt is 50:50). It is extruded after being distributed together according to the parallel composite spinning method;
  • the ratio of the number of spinneret holes m (ellipse) through which the direct extrusion flows through and the number of spinneret holes n (circular) through which the extrusion flows after being distributed in the parallel compound spinning mode is 1:6;
  • the ratio of the equivalent diameter of the filament hole m to the spinneret hole n is 1:1; all the spinneret holes are distributed in concentric circles, and the spinneret holes on the same circle are all m or all n.
  • Spinning holes are all n;
  • the spinneret hole m is composed of a sequentially connected guide hole E, transition hole and capillary pores.
  • the spinneret hole n is composed of a serially connected guide hole D, transition hole and capillary pore.
  • the guide hole E is connected with the distribution hole A and the guide Hole D is connected to distribution hole B and distribution hole C at the same time; distribution hole A, distribution hole B, and distribution hole C are located on the distribution plate in spinning box III; the shunt is to pass PET melt through spinning box I Transport to the distribution hole A and the distribution hole B, and at the same time transport the PET-PA6 copolymer melt to the distribution hole C through the spinning box II;
  • FDY filaments are made into FDY filaments according to the FDY process and then subjected to relaxation heat treatment to obtain self-crimped elastic mixed filament yarns for knitting;
  • the parameters of the FDY process are: the temperature of the spinning box I is 280°C, the temperature of the spinning box II is 271°C, the temperature of the spinning box III is 270°C, the cooling temperature is 20°C, and the network pressure is 0.25MPa , The speed of one roll is 2350m/min, the temperature of one roll is 80°C, the speed of two rolls is 3660m/min, the temperature of two rolls is 130°C, the winding speed is 3570m/min; the temperature of relaxation heat treatment is 103°C, and the time is 28min;
  • the prepared self-crimping elastic mixed filament for knitting is composed of PET monofilament and PET/PET-PA6 copolymer side-by-side composite monofilament; the crimping direction of the monofilament in the self-crimping elastic mixed filament for knitting is randomly distributed;
  • the crimp shrinkage rate of the self-crimped elastic mixed filament used for knitting is 52.8%, the crimp stability is 85%, the shrinkage elongation rate is 89%, and the crimp elastic recovery rate is 91.4%; the self-crimping elasticity for knitting
  • the breaking strength of the mixed filament yarn is 3.15 cN/dtex, the elongation at break is 46%, and the total fineness is 115 dtex.
  • the self-crimping elastic mixed filament yarn used for knitting prepared above was made into a knitted fabric, and the unevenness of the knitted fabric was tested.
  • the D of the knitted fabric made of the self-crimping elastic mixed filament yarn used for knitting was tested. The value is 0.82%.
  • the preparation method of self-crimping elastic mixed filament used for knitting, the preparation process is as follows:
  • the self-crimping elastic mixed filament used for knitting is extruded on the same spinneret; specifically:
  • the PET melt (intrinsic viscosity is 0.58dL/g) is divided into two paths: one is directly extruded after being distributed; the other is with PET-PA6 copolymer melt (intrinsic viscosity is 0.63dL/g, and it is in the hole
  • the mass ratio of the PET melt is 50:50). It is extruded after being distributed together according to the parallel composite spinning method;
  • the ratio of the number of spinneret holes m (triangle) through which the direct extrusion flows through and the number of spinneret holes n (circular) through which the extrusion flows through the parallel compound spinning mode is 1:7;
  • the ratio of the equivalent diameter of the hole m to the spin hole n is 1:1; all the spin holes are distributed in concentric circles, and the spin holes on the same circle are all m or all n.
  • the spray holes on the outermost circle are all m or n.
  • the silk holes are all n;
  • the spinneret hole m is composed of a sequentially connected guide hole E, transition hole and capillary pores.
  • the spinneret hole n is composed of a serially connected guide hole D, transition hole and capillary pore.
  • the guide hole E is connected with the distribution hole A and the guide Hole D is connected to distribution hole B and distribution hole C at the same time; distribution hole A, distribution hole B, and distribution hole C are located on the distribution plate in spinning box III; the shunt is to pass PET melt through spinning box I Transport to the distribution hole A and the distribution hole B, and at the same time transport the PET-PA6 copolymer melt to the distribution hole C through the spinning box II;
  • FDY filaments are made into FDY filaments according to the FDY process and then subjected to relaxation heat treatment to obtain self-crimped elastic mixed filament yarns for knitting;
  • the parameters of the FDY process are: the temperature of the spinning box I is 280°C, the temperature of the spinning box II is 274°C, the temperature of the spinning box III is 276°C, the cooling temperature is 21°C, and the network pressure is 0.23MPa , The speed of one roll is 2300m/min, the temperature of one roll is 76°C, the speed of two rolls is 3500m/min, the temperature of two rolls is 127°C, the winding speed is 3430m/min; the temperature of relaxation heat treatment is 120°C, and the time is 29min;
  • the prepared self-crimping elastic mixed filament for knitting is composed of PET monofilament and PET/PET-PA6 copolymer side-by-side composite monofilament; the crimping direction of the monofilament in the self-crimping elastic mixed filament for knitting is randomly distributed;
  • the crimp shrinkage rate of the self-crimping elastic mixed filament used for knitting is 52%, the crimp stability is 85.5%, the shrinkage elongation is 88%, and the crimp elastic recovery rate is 91.1%;
  • the self-crimping elasticity for knitting The breaking strength of the mixed filament yarn is 3 cN/dtex, the elongation at break is 51.2%, and the total fineness is 125 dtex.
  • the self-crimping elastic mixed filament yarn used for knitting prepared above was made into a knitted fabric, and the unevenness of the knitted fabric was tested.
  • the D of the knitted fabric made of the self-crimping elastic mixed filament yarn used for knitting was tested. The value is 0.38%.

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Abstract

一种用于针织的自卷曲弹性混纤丝的制备方法，该混纤丝在同一喷丝板上挤出；将第一成纤聚合物熔体分流成两路：一路经分配后直接挤出；另一路与第二成纤聚合物熔体一起按并列复合纺丝方式分配后挤出；第一成纤聚合物和第二成纤聚合物具有相容性或部分相容性；同一喷丝板上，直接挤出流经的喷丝孔m与按并列复合纺丝方式分配后挤出流经的喷丝孔n的数量之比为1:5～10；依照特定的纺丝工艺制得用于针织的自卷曲弹性混纤丝；该混纤丝主要由第一成纤聚合物单丝和第一成纤聚合物/第二成纤聚合物并列复合单丝组成；单丝卷曲方向随机分布，有效解决了双组分复合纤维针织物中所形成的"条阴状不匀"的问题。

Description

用于针织的自卷曲弹性混纤丝的制备方法 技术领域
本发明属于聚酯纤维技术领域，涉及一种用于针织的自卷曲弹性混纤丝的制备方法。
背景技术
卷曲是纤维的一项重要指标，影响纺织加工过程和最终成品特征与应用性能。
在双组分复合纤维这一大家族中，并列型双组分复合纤维是重要的一员，是利用两组分热收缩性能的差异，使纤维产生偏离纤维轴向的弯曲，呈现出永久性三维螺旋状卷曲，获得如羊毛纤维类似的卷曲。这种纤维的卷曲不需要普通热塑性纤维获得卷曲时进行的变形加工，免去了化学纤维的热损伤，故通常称其为“自卷曲纤维”，也称为三维立体卷曲纤维，这种卷曲具有持久稳定、弹性好等特点，可赋予织物更好的弹性、蓬松性和覆盖性。通过改变组分高聚物特性、横截面形状、组分分布、组分比例、纺丝牵伸及热定型工艺参数可获得不同性能的并列双组分复合纤维，并列双组分复合纤维由于具有性能可设计的优势，有较高的应用价值，因此受到纤维制造业的青睐与重视。
现有技术中，双组份复合纤维的三维螺旋卷曲使得其可以在外力拉伸作用下伸直，在撤除外力作用时又能很好地回复至初始的卷曲形态。研究表明，在一束PBT/PET双组份复合纤维中，其卷曲形态同时存在着相对整齐的左、右螺旋纱段和无规卷曲纱段，各纱段的长短及排列整体上是随机的。各卷曲纱段由于纤维倾斜状态和力学响应行为的不同，在使用PBT/PET复合纤维编制针织物时，会引起纱线反光效果以及张力不匀的差异，布面上随机形成凸起或凹陷，表观查看会发现明暗随机变化的“不均匀横纹”，即所谓的的“条阴状不匀”；这一问题导致双组分复合纤维无法应用于很多种针织产品上，严重制约了双组分复合纤维针织物开发应用。
因此，开发一种避免随机性的“条阴状不匀”出现的可用于针织的自卷曲弹性混纤丝的制备方法具有十分重要的意义。
发明内容
本发明提供一种用于针织的自卷曲弹性混纤丝的制备方法，目的是解决现有技术中用于针织的自卷曲弹性纤维在应用过程中会出现随机性的“条阴状不匀”的问题。本发明采用将第一成纤聚合物/第二成纤聚合物并列复合单丝中的一部分“替换”为第一成纤聚合物单丝的方式，打破了纯第一成纤聚合物/第二成纤聚合物并列复合纤维形成整齐的左、右螺旋形态，进而解决了由第一成纤聚合物/第二成纤聚合物并列复合纤维制得的针织物存在的“条阴状不匀”的问题。
为达到上述目的，本发明采用的方案如下：
一种用于针织的自卷曲弹性混纤丝的制备方法，该用于针织的自卷曲弹性混纤丝是在同一喷丝板上 挤出；
将第一成纤聚合物熔体分流成两路：一路经分配后直接挤出；另一路与第二成纤聚合物熔体一起按并列复合纺丝方式分配后挤出；
第一成纤聚合物和第二成纤聚合物具有相容性或部分相容性。
同一喷丝板上，所述直接挤出流经的喷丝孔m与所述按并列复合纺丝方式分配后挤出流经的喷丝孔n的数量之比为1:5～10；
挤出后依照特定的纺丝工艺制得用于针织的自卷曲弹性混纤丝，特定的纺丝工艺为POY工艺、FDY工艺、POY-DTY工艺或POY-DT工艺，其中，POY工艺、FDY工艺和POY-DT工艺结束后，还对纤维进行松弛热处理。
具体地，本发明采用了将第一成纤聚合物熔体分流成两路，一路经分配后直接挤出，另一路与第二成纤聚合物熔体一起按并列复合纺丝方式分配后挤出的方式实现了“替换”，相应地，合理地设置了分配孔和导孔的数量和位置关系，以保证分流的顺利进行；本发明通过控制直接挤出流经的喷丝孔m与按并列复合纺丝方式分配后挤出流经的喷丝孔n的数量之比保证了被替换部分占整体的比例适宜，既能有效解决“条阴状不匀”的问题，又能保持第一成纤聚合物/第二成纤聚合物并列复合纤维的优良性能；本发明将喷丝孔m和喷丝孔n按同心圆进行分布，并控制喷丝孔m尽可能多地位于同心圆的内圈，保证了第一成纤聚合物单丝能够充分地掺入第一成纤聚合物/第二成纤聚合物并列复合纤维中，发挥打破纯第一成纤聚合物/第二成纤聚合物并列复合纤维形成整齐的左、右螺旋形态的作用；本发明通过合理设置纺丝箱体III温度、第一成纤聚合物熔体纺丝箱体I温度、第二成纤聚合物熔体纺丝箱体II温度，使其能够与第一成纤聚合物熔体的特性粘度和第二成纤聚合物熔体的特性粘度相互配合，保证从喷丝孔挤出的第一成纤聚合物组份和第二成纤聚合物组份的表观粘度较为接近，从而保证了纺丝的顺利进行；本发明无需对喷丝孔的形状进行调整，选用常用的单组份喷丝孔和并列型复合喷丝孔即可；本发明选用了特定的纺丝工艺，制得的产品的卷曲收缩率、卷曲稳定度、紧缩伸长率、卷缩弹性回复率均较高，同时力学性能良好。
本发明的原理如下：
本发明中的用于针织的自卷曲弹性混纤丝是由第一成纤聚合物单丝和第一成纤聚合物/第二成纤聚合物并列复合单丝组成，对应的两种成纤聚合物的热收缩率不同；将二者混合后，两种聚合物的玻璃化转变温度的关系为：混合后的聚合物的玻璃化转变温度在玻璃化转变温度低的聚合物和玻璃化转变温度高的聚合物之间，这说明本发明所采用的这两种热收缩率不同的聚合物具有相容性或部分相容性，相容性的存在使得聚合物通过同一个喷丝孔(即两种成纤聚合物熔体一起按照并列复合纺丝方式分配后挤出)时可以粘合在一起，这种粘合作用与前述的不同的热收缩率作用一起，使得从同一个喷丝孔出来的 两种聚合物纤维(即第一成纤聚合物/第二成纤聚合物并列复合单丝)在经过松弛热处理后可以形成自卷曲形态，从而具有弹性。
在实现上述的自卷曲弹性的同时，本发明通过将第一成纤聚合物熔体分流成两路：一路与第二成纤聚合物熔体一起按并列复合纺丝方式分配后挤出(是为了实现自卷曲弹性)；另一路经分配后直接挤出，挤出后即形成第一成纤聚合物单丝，且两路所对应的喷丝孔的数量之比为1:5～10，该单丝的存在发挥打破纯第一成纤聚合物/第二成纤聚合物并列复合单丝形成整齐的左、右螺旋形态的作用，使得制得的用于针织的自卷曲弹性混纤丝经松弛热处理后单丝卷曲方向随机分布；所以由该自卷曲弹性混纤丝织造的针织物表面不会出现随机性的“条阴状不匀”。
而且本发明的用于针织的自卷曲弹性混纤丝在纵向上呈三维螺旋状卷曲，其三维卷曲可使织物具有良好的蓬松性、弹性、延伸性和柔软的手感，同时不规整的螺旋卷曲会使其织物有良好的导湿性能。
作为优选的技术方案：
如上所述的一种用于针织的自卷曲弹性混纤丝的制备方法，经过喷丝孔n的第一成纤聚合物熔体的质量与第二成纤聚合物熔体的质量比为50～50，喷丝孔m与喷丝孔n的当量直径之比为1:1；第一成纤聚合物和第二成纤聚合物的材质相同，粘度不同，或者第一成纤聚合物和第二成纤聚合物的材质不同，满足这两种条件的聚合物之间，也必然存在热收缩率的不同，经松弛热处理后，纤维才能形成自卷曲形态；第一成纤聚合物和第二成纤聚合物的材质选自于聚酯均聚物(如PET、PBT、PTT)、聚酯共聚物(如PET-PBT、PET-PTT、PET-PEG、PET-PTMG、PBT-PTT)、聚酯改性产物(如CDP、ECDP、亲水PET、上染PET)、聚酰胺均聚物(如PA6、PA66)、聚酰胺共聚物(如PA6-PBT、PA6-PTT)和聚酰胺改性产物(如PA6-11、PA6-PET)。
如上所述的一种用于针织的自卷曲弹性混纤丝的制备方法，喷丝孔m为圆形、椭圆形、三角形、Y形、十字形、“8”字形、矩形或一字形喷丝孔，喷丝孔n为圆形、椭圆形或“8”字形喷丝孔。
如上所述的一种用于针织的自卷曲弹性混纤丝的制备方法，所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n，从而保证第一成纤聚合物单丝混入第一成纤聚合物/第二成纤聚合物并列复合单丝中间，起到打破形成整齐的左、右螺旋形态的作用；否则，较多的第一成纤聚合物单丝分布在最外圈，会使得内部的第一成纤聚合物/第二成纤聚合物并列复合单丝依然存在整齐的左、右螺旋形态。
如上所述的一种用于针织的自卷曲弹性混纤丝的制备方法，喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将第一成纤聚合物熔体经纺丝箱体I输送至分配孔A和分配孔B，同时将第二成纤聚合物熔 体经纺丝箱体II输送至分配孔C。
如上所述的一种用于针织的自卷曲弹性混纤丝的制备方法，纺丝组件内，第一成纤聚合物熔体与第二成纤聚合物熔体的表观粘度相差不超过5％。为了确保纺丝的顺利进行，需要尽量保证两种组份从同一喷丝孔内挤出时有相同的流动状态，即熔体的表观粘度接近(对于同种聚合物，表观粘度越大，流动性能越差)；第一成纤聚合物与第二成纤聚合物的表观粘度可以通过温度来调节，本发明通过合理设置纺丝箱体III温度、第一成纤聚合物熔体纺丝箱体I温度、第二成纤聚合物熔体纺丝箱体II温度，使其能够与第一成纤聚合物熔体的特性粘度和第二成纤聚合物熔体的特性粘度相互配合，第一成纤聚合物采用高温熔融，低温纺丝，第二成纤聚合物采用低温熔融，高温纺丝，这样可以减小第二成纤聚合物的降解，尽管两种组分在箱体内温度差异较大，但两种组分进入到同一个复合组件时发生热交换，第一成纤聚合物组分的温度降低，第二成纤聚合物组分的温度升高，这样从喷丝孔挤出两种组分表观粘度接近一致，从而能够确保纺丝的顺利进行。
如上所述的一种用于针织的自卷曲弹性混纤丝的制备方法，松弛热处理的温度为90～120℃，时间为20～30min。
采用如上任一项所述的一种用于针织的自卷曲弹性混纤丝的制备方法制得的用于针织的自卷曲弹性混纤丝，主要由第一成纤聚合物单丝和第一成纤聚合物/第二成纤聚合物并列复合单丝组成；用于针织的自卷曲弹性混纤丝经松弛热处理后单丝卷曲方向随机分布，随机分布是一个数学概念，即每根纤维的卷曲形态不同于其它纤维，从而使得制得的织物不存在条阴状不匀。
有益效果：
(1)本发明的一种用于针织的自卷曲弹性混纤丝的制备方法，由第一成纤聚合物单丝和第一成纤聚合物/第二成纤聚合物并列复合单丝组成的用于针织的自卷曲弹性混纤丝无法形成螺旋卷曲的规整排列，从而可以解决第一成纤聚合物/第二成纤聚合物并列型复合纤维在针织织物中形成的“条阴状不匀”的问题；
(2)本发明的一种用于针织的自卷曲弹性混纤丝的制备方法，适用范围广，具有较好的推广价值。
附图说明
图1为本发明的喷丝板的结构示意图；
其中，A、B和C为相互独立的分配孔，D和E为相互独立的导孔。
具体实施方式
下面结合具体实施方式，进一步阐述本发明。应理解，这些实施例仅用于说明本发明而不用于限制本发明的范围。此外应理解，在阅读了本发明讲授的内容之后，本领域技术人员可以对本发明作各种改 动或修改，这些等价形式同样落于本申请所附权利要求书所限定的范围。
本发明的卷曲收缩率和卷曲稳定度是采用GB6506-2001《合成纤维变形丝卷缩性能试验方法》对丝束进行测试得到的；
紧缩伸长率(反映变形丝的弹性和卷曲程度，纤维先承受轻负荷，再承受重负荷，计算两种负荷下的长度差值与卷曲长度的比值)和卷缩弹性回复率测试方法如下：
首先剪取长度约50cm的纤维试样两根，放入100℃热水中处理30min，取出后进行自然干燥，再截取约30cm长的试样，一端固定，一端加载0.0018cN/dtex的负荷，持续30s，在20cm处作标记，即为试样的初始长度l 1；然后改为加载0.09cN/dtex的负荷，持续30s，测量标记点的位置，即为试样加重负荷时的长度l 2；最后去掉重负荷，试样无负荷回缩2min后再加0.0018cN/dtex的负荷，持续30s，测量标记点在标尺上的位置，即为回复长度l 3；紧缩伸长率(CE)和卷缩弹性回复率(SR)按下式计算：
CE＝(l 2-l 1)/l 1；
SR＝(l 2-l 3)/(l 2-l 1)。
实施例1
一种用于针织的自卷曲弹性混纤丝，制备过程如下：
(1)用于针织的自卷曲弹性混纤丝在同一喷丝板上挤出；
将特性粘度为0.57dL/g的PET熔体分流成两路：一路经分配后直接挤出；另一路与特性粘度为1.17dL/g的PTT熔体一起按并列复合纺丝方式分配后挤出；
同一喷丝板上，所述直接挤出流经的圆形喷丝孔m与所述按并列复合纺丝方式分配后挤出流经的圆形喷丝孔n的数量之比为1:6，喷丝孔m与喷丝孔n的当量直径之比为1:1，经过喷丝孔n的PET熔体的质量与PTT熔体的质量比为50:50；所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n；
如图1所示，喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将PET熔体经纺丝箱体I输送至分配孔A和分配孔B，同时将PTT熔体经纺丝箱体II输送至分配孔C；纺丝箱体I的温度为276℃，纺丝箱体II的温度为260℃，纺丝箱体III的温度为275℃；
(2)挤出后依照POY工艺制得POY丝，再经DT拉伸工艺制成DT丝后进行松弛热处理，即得用于针织的自卷曲弹性混纤丝；
POY工艺的参数为：冷却温度24℃，卷绕速度2580m/min；DT拉伸工艺的参数为：热盘温度85℃，热板温度120℃，倍数1.6；松弛热处理的温度为109℃，时间为26min；
用于针织的自卷曲弹性混纤丝由PET单丝和PTT/PET并列复合单丝组成，用于针织的自卷曲弹性混纤丝中单丝卷曲方向随机分布；用于针织的自卷曲弹性混纤丝的卷曲收缩率为69％，卷曲稳定度为94％，紧缩伸长率为111％，卷缩弹性回复率为83％；用于针织的自卷曲弹性混纤丝的断裂强度为3.2cN/dtex，断裂伸长率为46.5％，总纤度为130dtex。
实施例2
一种用于针织的自卷曲弹性混纤丝，制备过程如下：
(1)用于针织的自卷曲弹性混纤丝在同一喷丝板上挤出；
将特性粘度为0.58dL/g的PET熔体分流成两路：一路经分配后直接挤出；另一路与特性粘度为1.15dL/g的PTT熔体一起按并列复合纺丝方式分配后挤出；
同一喷丝板上，所述直接挤出流经的椭圆形喷丝孔m与所述按并列复合纺丝方式分配后挤出流经的椭圆形喷丝孔n的数量之比为1:10，喷丝孔m与喷丝孔n的当量直径之比为1:1，经过喷丝孔n的PET熔体的质量与PTT熔体的质量比为50:50；所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将PET熔体经纺丝箱体I输送至分配孔A和分配孔B，同时将PTT熔体经纺丝箱体II输送至分配孔C；纺丝箱体I的温度为280℃，纺丝箱体II的温度为265℃，纺丝箱体III的温度为273℃；
(2)挤出后依照POY工艺制得POY丝，再经DT拉伸工艺制成DT丝后进行松弛热处理，即得用于针织的自卷曲弹性混纤丝；
POY工艺的参数为：冷却温度25℃，卷绕速度2550m/min；DT拉伸工艺的参数为：热盘温度85℃，热板温度124℃，倍数1.8；松弛热处理的温度为115℃，时间为22min；
用于针织的自卷曲弹性混纤丝由PET单丝和PTT/PET并列复合单丝组成，用于针织的自卷曲弹性混纤丝中单丝卷曲方向随机分布；用于针织的自卷曲弹性混纤丝的卷曲收缩率为66％，卷曲稳定度为93％，紧缩伸长率为112％，卷缩弹性回复率为84％；用于针织的自卷曲弹性混纤丝的断裂强度为3.1cN/dtex，断裂伸长率为48.3％，总纤度为115dtex。
实施例3
一种用于针织的自卷曲弹性混纤丝，制备过程如下：
(1)用于针织的自卷曲弹性混纤丝在同一喷丝板上挤出；
将特性粘度为0.55dL/g的PET熔体分流成两路：一路经分配后直接挤出；另一路与特性粘度为 1.2dL/g的PTT熔体一起按并列复合纺丝方式分配后挤出；
同一喷丝板上，所述直接挤出流经的三角形喷丝孔m与所述按并列复合纺丝方式分配后挤出流经的“8”字形喷丝孔n的数量之比为1:5，喷丝孔m与喷丝孔n的当量直径之比为1:1，经过喷丝孔n的PET熔体的质量与PTT熔体的质量比为50:50；所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将PET熔体经纺丝箱体I输送至分配孔A和分配孔B，同时将PTT熔体经纺丝箱体II输送至分配孔C；纺丝箱体I的温度为278℃，纺丝箱体II的温度为264℃，纺丝箱体III的温度为275℃；
(2)挤出后依照POY工艺制得POY丝，再经DT拉伸工艺制成DT丝后进行松弛热处理，即得用于针织的自卷曲弹性混纤丝；
POY工艺的参数为：冷却温度24℃，卷绕速度2640m/min；DT拉伸工艺的参数为：热盘温度88℃，热板温度126℃，倍数1.8；松弛热处理的温度为120℃，时间为20min；
用于针织的自卷曲弹性混纤丝由PET单丝和PTT/PET并列复合单丝组成，用于针织的自卷曲弹性混纤丝中单丝卷曲方向随机分布；用于针织的自卷曲弹性混纤丝的卷曲收缩率为69％，卷曲稳定度为93.8％，紧缩伸长率为113％，卷缩弹性回复率为84％；用于针织的自卷曲弹性混纤丝的断裂强度为3.3cN/dtex，断裂伸长率为49.2％，总纤度为125dtex。
实施例4
一种用于针织的自卷曲弹性混纤丝，其过程如下：
(1)用于针织的自卷曲弹性混纤丝在同一喷丝板上挤出；
将高粘度PET熔体(特性粘度为0.75dL/g)分流成两路：一路经分配后直接挤出；另一路与低粘度PET熔体(特性粘度为0.5dL/g)一起按并列复合纺丝方式分配后挤出；
所述直接挤出流经的圆形喷丝孔m与所述按并列复合纺丝方式分配后挤出流经的圆形喷丝孔n的数量之比为1:8；经过喷丝孔n的高粘度PET熔体的质量与低粘度PET熔体的质量比为50:50，喷丝孔m与喷丝孔n的当量直径之比为1:1；
所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将高粘度PET熔体经纺丝箱体I输送至分配 孔A和分配孔B，同时将低粘度PET熔体经纺丝箱体II输送至分配孔C；纺丝箱体I的温度为286℃，纺丝箱体II的温度为275℃，纺丝箱体III的温度为283℃；
(2)挤出后依照FDY工艺制成FDY丝后进行松弛热处理，即得用于针织的自卷曲弹性混纤丝；
FDY工艺的参数为：冷却温度25℃，网络压力0.2MPa，一辊速度2300m/min，一辊温度85℃，二辊速度3560m/min，二辊温度150℃，卷绕速度3460m/min；松弛热处理的温度为104℃，时间为30min；
制得的用于针织的自卷曲弹性混纤丝，由高粘度PET单丝和高粘度PET/低粘度PET并列复合单丝组成；用于针织的自卷曲弹性混纤丝中单丝卷曲方向随机分布；用于针织的自卷曲弹性混纤丝的卷曲收缩率为53％，卷曲稳定度为87％，紧缩伸长率为98％，卷缩弹性回复率为96％；用于针织的自卷曲弹性混纤丝的断裂强度3.1cN/dtex，断裂伸长率为45％，总纤度为130dtex。将上述制得的用于针织的自卷曲弹性混纤丝制成针织物，并测试该针织物的条阴状不匀情况，该织物的D值为0.51。
实施例5
一种用于针织的自卷曲弹性混纤丝，其过程如下：
(1)用于针织的自卷曲弹性混纤丝在同一喷丝板上挤出；
将高粘度PET熔体(特性粘度为0.73dL/g)分流成两路：一路经分配后直接挤出；另一路与低粘度PET熔体(特性粘度为0.54dL/g)一起按并列复合纺丝方式分配后挤出；
所述直接挤出流经的椭圆形喷丝孔m与所述按并列复合纺丝方式分配后挤出流经的圆形喷丝孔n的数量之比为1:6；经过喷丝孔n的高粘度PET熔体的质量与低粘度PET熔体的质量比为50:50，喷丝孔m与喷丝孔n的当量直径之比为1:1；
所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将高粘度PET熔体经纺丝箱体I输送至分配孔A和分配孔B，同时将低粘度PET熔体经纺丝箱体II输送至分配孔C；纺丝箱体I的温度为282℃，纺丝箱体II的温度为271℃，纺丝箱体III的温度为278℃；
(2)挤出后依照FDY工艺制成FDY丝后进行松弛热处理，即得用于针织的自卷曲弹性混纤丝；
FDY工艺的参数为：冷却温度20℃，网络压力0.25MPa，一辊速度2350m/min，一辊温度95℃，二辊速度3660m/min，二辊温度160℃，卷绕速度3530m/min；松弛热处理的温度为103℃，时间为28min；
制得的用于针织的自卷曲弹性混纤丝，由高粘度PET单丝和高粘度PET/低粘度PET并列复合单丝组成；用于针织的自卷曲弹性混纤丝中单丝卷曲方向随机分布；用于针织的自卷曲弹性混纤丝的卷曲收缩率为52.8％，卷曲稳定度为85％，紧缩伸长率为95％，卷缩弹性回复率为95.4％；用于针织的自卷曲 弹性混纤丝的断裂强度3.1cN/dtex，断裂伸长率为44.2％，总纤度为115dtex。将上述制得的用于针织的自卷曲弹性混纤丝制成针织物，并测试该针织物的条阴状不匀情况，该织物的D值为0.39。
实施例6
一种用于针织的自卷曲弹性混纤丝，其过程如下：
(1)用于针织的自卷曲弹性混纤丝在同一喷丝板上挤出；
将高粘度PET熔体(特性粘度为0.73dL/g)分流成两路：一路经分配后直接挤出；另一路与低粘度PET熔体(特性粘度为0.55dL/g)一起按并列复合纺丝方式分配后挤出；
所述直接挤出流经的三角形喷丝孔m与所述按并列复合纺丝方式分配后挤出流经的圆形喷丝孔n的数量之比为1:8；经过喷丝孔n的高粘度PET熔体的质量与低粘度PET熔体的质量比为50:50，喷丝孔m与喷丝孔n的当量直径之比为1:1；
所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将高粘度PET熔体经纺丝箱体I输送至分配孔A和分配孔B，同时将低粘度PET熔体经纺丝箱体II输送至分配孔C；纺丝箱体I的温度为283℃，纺丝箱体II的温度为275℃，纺丝箱体III的温度为279℃；
(2)挤出后依照FDY工艺制成FDY丝后进行松弛热处理，即得用于针织的自卷曲弹性混纤丝；
FDY工艺的参数为：冷却温度21℃，网络压力0.23MPa，一辊速度2300m/min，一辊温度86℃，二辊速度3500m/min，二辊温度151℃，卷绕速度3430m/min；松弛热处理的温度为120℃，时间为29min；
制得的用于针织的自卷曲弹性混纤丝，由高粘度PET单丝和高粘度PET/低粘度PET并列复合单丝组成；用于针织的自卷曲弹性混纤丝中单丝卷曲方向随机分布；用于针织的自卷曲弹性混纤丝的卷曲收缩率为52％，卷曲稳定度为85.5％，紧缩伸长率为96％，卷缩弹性回复率为95.1％；用于针织的自卷曲弹性混纤丝的断裂强度3cN/dtex，断裂伸长率为46％，总纤度为125dtex。将上述制得的用于针织的自卷曲弹性混纤丝制成针织物，并测试该针织物的条阴状不匀情况，该织物的D值为0.68。
实施例7
用于针织的自卷曲弹性混纤丝的制备方法，其过程如下：
(1)用于针织的自卷曲弹性混纤丝在同一喷丝板上挤出；
将PBT熔体(特性粘度为0.97dL/g)分流成两路：一路经分配后直接挤出；另一路与PTT熔体(特性粘度为1.03dL/g)一起按并列复合纺丝方式分配后挤出；经过喷丝孔n的PBT熔体的质量与PTT熔体的质量比为50:50，喷丝孔m与喷丝孔n的当量直径之比为1:1；喷丝孔m为圆形喷丝孔，喷丝孔n 为圆形喷丝孔；所述直接挤出流经的喷丝孔m与所述按并列复合纺丝方式分配后挤出流经的喷丝孔n的数量之比为1:6；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将PBT熔体经纺丝箱体I输送至分配孔A和分配孔B，同时将PTT熔体经纺丝箱体II输送至分配孔C；纺丝箱体I的温度为269℃，纺丝箱体II的温度为272℃，纺丝箱体III的温度为279℃；所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n；
(2)挤出后依照POY-DTY工艺制得用于针织的自卷曲弹性混纤丝；其中，POY工艺的参数为：冷却温度24℃，网络压力0.2MPa，卷绕速度2800m/min；DTY工艺的参数为：纺丝速度750m/min，定型超喂率3.5％，卷绕超喂率3％，一热箱温度200℃，二热箱温度173℃，拉伸倍数1.5，D/Y值1.9，网络压力0.05MPa；
制得的用于针织的自卷曲弹性混纤丝，由PBT单丝和PBT/PTT并列复合单丝组成单丝卷曲方向随机分布；
选取上述制得的单丝卷曲方向随机分布的PBT/PET双组份弹性丝进行测试，测试得到其卷曲收缩率为65％，卷曲稳定度为85％，紧缩伸长率为108％，卷缩弹性回复率为98％；断裂强度为27cN/dtex，断裂伸长率为49％，总纤度为200dtex。
对比例1
一种用于针织的自卷曲弹性混纤丝的制备方法，其过程与实施例7基本相同，不同之处仅在于纺丝中，PBT熔体没有分流成两路，而是全部与PTT熔体一起按并列复合纺丝方式分配后挤出；因此，制成的用于针织的自卷曲弹性混纤丝中不存在PTT单丝。
将对比例1与实施例7制得的用于针织的自卷曲弹性混纤丝，分别采用一种无缝成型针织圆机织造的平纹针织物，测试两种平纹针织物条阴状不匀情况，每一个平纹针织物的测试过程为：先采集平纹针织物图像并将其转化为灰度图像，再对灰度图像进行第一次处理和第二次处理后计算参数D，以参数D表征条阴状不匀的程度，其中，灰度图像包括条阴区、非条阴区的高灰度值区域和非条阴区的低灰度值区域；第一次处理即将灰度图像中非条阴区的高灰度值区域的像素点变为纯白点；第二次处理即将灰度图像中非条阴区的低灰度值区域的像素点变为纯白点；参数D的计算公式为：D＝ΣB/A，其中，ΣB代表灰度图像中灰度值为0的像素点的个数，A代表灰度图像中像素点的总个数。
测试得到的结果为：实施例7中的用于针织的自卷曲弹性混纤丝制成的平纹针织物的D值为0.7％；对比例1中的用于针织的自卷曲弹性混纤丝制成的平纹针织物的D值为16.8％；这说明采用实施例7中 的用于针织的自卷曲弹性混纤丝织造的平纹针织物中条阴状不匀的情况减少，这是因为实施例7中用部分PBT单丝替代部分PBT/PTT并列复合单丝，从而打破纯PBT/PTT双组份复合纤维整齐的左、右螺旋形态；使每根PBT/PTT并列复合单丝的卷曲形态不同于其它纤维，在制成平纹针织物后，布面不会出现条阴状不匀的情况；而采用对比例1的用于针织的自卷曲弹性混纤丝制得的平纹针织物，因纤维存在整齐的的左、右螺旋形态，这种整齐的螺旋形态在布面会呈现条阴状不匀的情况。
实施例8
用于针织的自卷曲弹性混纤丝的制备方法，其过程如下：
(1)用于针织的自卷曲弹性混纤丝在同一喷丝板上挤出；
将PBT熔体(特性粘度为0.95dL/g)分流成两路：一路经分配后直接挤出；另一路与PTT熔体(特性粘度为1.05dL/g)一起按并列复合纺丝方式分配后挤出；经过喷丝孔n的PBT熔体的质量与PTT熔体的质量比为50:50，喷丝孔m与喷丝孔n的当量直径之比为1:1；喷丝孔m为圆形喷丝孔，喷丝孔n为椭圆形喷丝孔；所述直接挤出流经的喷丝孔m与所述按并列复合纺丝方式分配后挤出流经的喷丝孔n的数量之比为1:7；
其中，喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将PBT熔体经纺丝箱体I输送至分配孔A和分配孔B，同时将PTT熔体经纺丝箱体II输送至分配孔C；纺丝箱体I的温度为272℃，纺丝箱体II的温度为275℃，纺丝箱体III的温度为276℃；所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n；
(2)挤出后依照POY-DTY工艺制得用于针织的自卷曲弹性混纤丝；其中，POY工艺的参数为：冷却温度25℃，网络压力0.21MPa，卷绕速度3000m/min；DTY工艺的参数为：纺丝速度800m/min，定型超喂率3.8％，卷绕超喂率3.3％，一热箱温度220℃，二热箱温度180℃，拉伸倍数1.9，D/Y值2.2，网络压力1.5MPa；
制得的用于针织的自卷曲弹性混纤丝，由PBT单丝和PBT/PTT并列复合单丝组成单丝卷曲方向随机分布；
选取上述制得的单丝卷曲方向随机分布的PBT/PET双组份弹性丝进行测试，测试得到其卷曲收缩率为61％，卷曲稳定度为86％，紧缩伸长率为108％，卷缩弹性回复率为97％；断裂强度为25cN/dtex，断裂伸长率为55％，总纤度为105dtex。
实施例9
用于针织的自卷曲弹性混纤丝的制备方法，其过程如下：
(1)用于针织的自卷曲弹性混纤丝在同一喷丝板上挤出；
将PBT熔体(特性粘度为0.98dL/g)分流成两路：一路经分配后直接挤出；另一路与PTT熔体(特性粘度为1.1dL/g)一起按并列复合纺丝方式分配后挤出；经过喷丝孔n的PBT熔体的质量与PTT熔体的质量比为50:50，喷丝孔m与喷丝孔n的当量直径之比为1:1；喷丝孔m为圆形喷丝孔，喷丝孔n为“8”字形喷丝孔；所述直接挤出流经的喷丝孔m与所述按并列复合纺丝方式分配后挤出流经的喷丝孔n的数量之比为1:5；
其中，喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将PBT熔体经纺丝箱体I输送至分配孔A和分配孔B，同时将PTT熔体经纺丝箱体II输送至分配孔C；纺丝箱体I的温度为269℃，纺丝箱体II的温度为276℃，纺丝箱体III的温度为276℃；所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n；
(2)挤出后依照POY-DTY工艺制得用于针织的自卷曲弹性混纤丝；其中，POY工艺的参数为：冷却温度24℃，网络压力0.22MPa，卷绕速度3100m/min；DTY工艺的参数为：纺丝速度770m/min，定型超喂率4.5％，卷绕超喂率3.9％，一热箱温度178℃，二热箱温度130℃，拉伸倍数1.5，D/Y值1.8，网络压力1.4MPa；
制得的用于针织的自卷曲弹性混纤丝，由PBT单丝和PBT/PTT并列复合单丝组成单丝卷曲方向随机分布；
选取上述制得的单丝卷曲方向随机分布的PBT/PET双组份弹性丝进行测试，测试得到其卷曲收缩率为65％，卷曲稳定度为87％，紧缩伸长率为110％，卷缩弹性回复率为98％；断裂强度为26cN/dtex，断裂伸长率为50％，总纤度为120dtex。
实施例10
用于针织的自卷曲弹性混纤丝的制备方法，其制备过程如下：
(1)用于针织的自卷曲弹性混纤丝在同一喷丝板上挤出；具体地：
将PET熔体(特性粘度为0.5dL/g)分流成两路：一路经分配后直接挤出；另一路与PET-PA6共聚物熔体(特性粘度为0.65dL/g，且与该孔中PET熔体的质量比为50:50)一起按并列复合纺丝方式分配后挤出；
所述直接挤出流经的喷丝孔m(圆形)与所述按并列复合纺丝方式分配后挤出流经的喷丝孔n(圆形)的数量之比为1:7；喷丝孔m与喷丝孔n的当量直径之比为1:1；所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将PET熔体经纺丝箱体I输送至分配孔A和分配孔B，同时将PET-PA6共聚物熔体经纺丝箱体II输送至分配孔C；
(2)挤出后依照FDY工艺制成FDY丝后进行松弛热处理，即得用于针织的自卷曲弹性混纤丝；
其中，FDY工艺的参数为：纺丝箱体I的温度为282℃，纺丝箱体II的温度为274℃，纺丝箱体III的温度为280℃，冷却温度25℃，网络压力0.2MPa，一辊速度2300m/min，一辊温度70℃，二辊速度3560m/min，二辊温度125℃，卷绕速度3480m/min；松弛热处理的温度为104℃，时间为30min；
制得的用于针织的自卷曲弹性混纤丝由PET单丝和PET/PET-PA6共聚物并列复合单丝组成；该用于针织的自卷曲弹性混纤丝中单丝卷曲方向随机分布；用于针织的自卷曲弹性混纤丝的卷曲收缩率为53％，卷曲稳定度为87％，紧缩伸长率为90％，卷缩弹性回复率为93％；该用于针织的自卷曲弹性混纤丝的断裂强度为3.4cN/dtex，断裂伸长率为45％，总纤度为130dtex。
将上述制得的用于针织的自卷曲弹性混纤丝制成针织物，并测试该针织物的条阴状不匀情况，用于针织的自卷曲弹性混纤丝制成的针织物的D值为0.54％。
实施例11
用于针织的自卷曲弹性混纤丝的制备方法，其制备过程如下：
(1)用于针织的自卷曲弹性混纤丝在同一喷丝板上挤出；具体地：
将PET熔体(特性粘度为0.56dL/g)分流成两路：一路经分配后直接挤出；另一路与PET-PA6共聚物熔体(特性粘度为0.63dL/g，且与该孔中PET熔体的质量比为50:50)一起按并列复合纺丝方式分配后挤出；
所述直接挤出流经的喷丝孔m(椭圆形)与所述按并列复合纺丝方式分配后挤出流经的喷丝孔n(圆形)的数量之比为1:6；喷丝孔m与喷丝孔n的当量直径之比为1:1；所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将PET熔体经纺丝箱体I输送至分配孔A和分配孔B，同时将PET-PA6共聚物熔体经纺丝箱体II输送至分配孔C；
(2)挤出后依照FDY工艺制成FDY丝后进行松弛热处理，即得用于针织的自卷曲弹性混纤丝；
其中，FDY工艺的参数为：纺丝箱体I的温度为280℃，纺丝箱体II的温度为271℃，纺丝箱体III的温度为270℃，冷却温度20℃，网络压力0.25MPa，一辊速度2350m/min，一辊温度80℃，二辊速度 3660m/min，二辊温度130℃，卷绕速度3570m/min；松弛热处理的温度为103℃，时间为28min；
制得的用于针织的自卷曲弹性混纤丝由PET单丝和PET/PET-PA6共聚物并列复合单丝组成；该用于针织的自卷曲弹性混纤丝中单丝卷曲方向随机分布；用于针织的自卷曲弹性混纤丝的卷曲收缩率为52.8％，卷曲稳定度为85％，紧缩伸长率为89％，卷缩弹性回复率为91.4％；该用于针织的自卷曲弹性混纤丝的断裂强度为3.15cN/dtex，断裂伸长率为46％，总纤度为115dtex。
将上述制得的用于针织的自卷曲弹性混纤丝制成针织物，并测试该针织物的条阴状不匀情况，用于针织的自卷曲弹性混纤丝制成的针织物的D值为0.82％。
实施例12
用于针织的自卷曲弹性混纤丝的制备方法，其制备过程如下：
(1)用于针织的自卷曲弹性混纤丝在同一喷丝板上挤出；具体地：
将PET熔体(特性粘度为0.58dL/g)分流成两路：一路经分配后直接挤出；另一路与PET-PA6共聚物熔体(特性粘度为0.63dL/g，且与该孔中PET熔体的质量比为50:50)一起按并列复合纺丝方式分配后挤出；
所述直接挤出流经的喷丝孔m(三角形)与所述按并列复合纺丝方式分配后挤出流经的喷丝孔n(圆形)的数量之比为1:7；喷丝孔m与喷丝孔n的当量直径之比为1:1；所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将PET熔体经纺丝箱体I输送至分配孔A和分配孔B，同时将PET-PA6共聚物熔体经纺丝箱体II输送至分配孔C；
(2)挤出后依照FDY工艺制成FDY丝后进行松弛热处理，即得用于针织的自卷曲弹性混纤丝；
其中，FDY工艺的参数为：纺丝箱体I的温度为280℃，纺丝箱体II的温度为274℃，纺丝箱体III的温度为276℃，冷却温度21℃，网络压力0.23MPa，一辊速度2300m/min，一辊温度76℃，二辊速度3500m/min，二辊温度127℃，卷绕速度3430m/min；松弛热处理的温度为120℃，时间为29min；
制得的用于针织的自卷曲弹性混纤丝由PET单丝和PET/PET-PA6共聚物并列复合单丝组成；该用于针织的自卷曲弹性混纤丝中单丝卷曲方向随机分布；用于针织的自卷曲弹性混纤丝的卷曲收缩率为52％，卷曲稳定度为85.5％，紧缩伸长率为88％，卷缩弹性回复率为91.1％；该用于针织的自卷曲弹性混纤丝的断裂强度为3cN/dtex，断裂伸长率为51.2％，总纤度为125dtex。
将上述制得的用于针织的自卷曲弹性混纤丝制成针织物，并测试该针织物的条阴状不匀情况，用于针织的自卷曲弹性混纤丝制成的针织物的D值为0.38％。

Claims (7)

  1. 一种用于针织的自卷曲弹性混纤丝的制备方法，其特征是：用于针织的自卷曲弹性混纤丝在同一喷丝板上挤出；
    将第一成纤聚合物熔体分流成两路：一路经分配后直接挤出；另一路与第二成纤聚合物熔体一起按并列复合纺丝方式分配后挤出；
    第一成纤聚合物和第二成纤聚合物具有相容性或部分相容性；
    同一喷丝板上，所述直接挤出流经的喷丝孔m与所述按并列复合纺丝方式分配后挤出流经的喷丝孔n的数量之比为1:5～10；
    挤出后依照特定的纺丝工艺制得用于针织的自卷曲弹性混纤丝，特定的纺丝工艺为POY工艺、FDY工艺、POY-DTY工艺或POY-DT工艺，其中，POY工艺、FDY工艺和POY-DT工艺结束后，还对纤维进行松弛热处理。
  2. 根据权利要求1所述的一种用于针织的自卷曲弹性混纤丝的制备方法，其特征在于，经过喷丝孔n的第一成纤聚合物熔体的质量与第二成纤聚合物熔体的质量比为50:50，喷丝孔m与喷丝孔n的当量直径之比为1:1；第一成纤聚合物和第二成纤聚合物的材质相同，粘度不同，或者第一成纤聚合物和第二成纤聚合物的材质不同；第一成纤聚合物和第二成纤聚合物的材质选自于聚酯或聚酰胺，为PET、PBT、PTT或PA6。
  3. 根据权利要求1所述的一种用于针织的自卷曲弹性混纤丝的制备方法，其特征在于，喷丝孔m为圆形、椭圆形、三角形、Y形、十字形、“8”字形、矩形或一字形喷丝孔，喷丝孔n为圆形、椭圆形或“8”字形喷丝孔。
  4. 根据权利要求1所述的一种用于针织的自卷曲弹性混纤丝的制备方法，其特征在于，所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，最外圈的圆上的喷丝孔都为n。
  5. 根据权利要求1所述的一种用于针织的自卷曲弹性混纤丝的制备方法，其特征在于，喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔D、过渡孔和毛细微孔构成，导孔E与分配孔A连接，导孔D同时与分配孔B和分配孔C连接；分配孔A、分配孔B和分配孔C位于纺丝箱体III中的分配板上；所述分流是将第一成纤聚合物熔体经纺丝箱体I输送至分配孔A和分配孔B，同时将第二成纤聚合物熔体经纺丝箱体II输送至分配孔C。
  6. 根据权利要求1所述的一种用于针织的自卷曲弹性混纤丝的制备方法，其特征在于，纺丝组件内，第一成纤聚合物熔体与第二成纤聚合物熔体的表观粘度相差不超过5％。
  7. 根据权利要求1所述的一种用于针织的自卷曲弹性混纤丝的制备方法，其特征在于，松弛 热处理的温度为90～120℃，时间为20～30min。
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