CN111041577B - PET/modified PET double-component elastic yarn and preparation method thereof - Google Patents

PET/modified PET double-component elastic yarn and preparation method thereof Download PDF

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CN111041577B
CN111041577B CN201911351564.9A CN201911351564A CN111041577B CN 111041577 B CN111041577 B CN 111041577B CN 201911351564 A CN201911351564 A CN 201911351564A CN 111041577 B CN111041577 B CN 111041577B
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pet
elastic yarn
modified
spinneret
hole
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CN111041577A (en
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王山水
范红卫
汤方明
魏存宏
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Jiangsu Hengli Chemical Fiber Co Ltd
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Jiangsu Hengli Chemical Fiber Co Ltd
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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
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D01D4/02—Spinnerettes
    • 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
    • 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
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Multicomponent Fibers (AREA)

Abstract

The invention relates to a PET/modified PET double-component elastic yarn and a preparation method thereof, wherein the preparation method comprises the following steps: extruding PET/modified PET double-component elastic yarns on the same spinneret plate, and splitting a PET melt into two paths: one path of the extruded PET/modified PET bicomponent elastic yarn is directly extruded after being distributed, the other path of the extruded PET/modified PET bicomponent elastic yarn is extruded after being distributed with PET-PA6 copolymer melt in a parallel composite spinning mode, the number ratio of spinneret orifices m flowing through the direct extrusion to spinneret orifices n flowing through the extrusion after being distributed in the parallel composite spinning mode is 1: 6-7, and the PET/modified PET bicomponent elastic yarn is prepared according to an FDY process after being extruded; the prepared bicomponent elastic yarn is composed of PET monofilament and PET/PET-PA6 copolymer parallel composite monofilament, and the curling directions of the monofilaments are randomly distributed. The invention effectively solves the problem of uneven stripe shade formed by PET/PET-PA6 copolymer side-by-side composite fibers in knitted fabrics.

Description

PET/modified PET double-component elastic yarn and preparation method thereof
Technical Field
The invention belongs to the technical field of polyester fibers, and relates to a PET/modified PET double-component elastic yarn and a preparation method thereof.
Background
Crimp is an important indicator of fiber, affecting textile processing and final end product characteristics and application properties.
In the family of the bicomponent composite fiber, the side-by-side bicomponent composite fiber is an important member, and the fiber is bent deviating from the axial direction of the fiber by utilizing the difference of the heat shrinkage performance of the two components, so that the fiber presents permanent three-dimensional spiral crimp, and the crimp similar to wool fiber is obtained. The fiber is crimped without deformation processing carried out when common thermoplastic fibers are crimped, so that the thermal damage of chemical fibers is avoided, the fiber is generally called self-crimped fiber and also called three-dimensional crimped fiber, the crimp has the characteristics of durability, stability, good elasticity and the like, and the fabric can be endowed with better elasticity, bulkiness and coverage. Parallel two-component composite fibers with different performances can be obtained by changing the characteristics of the component high polymer, the cross section shape, the component distribution, the component proportion, the spinning drafting and the heat setting process parameters, and the parallel two-component composite fibers have the advantage of designable performances and higher application value, so the parallel two-component composite fibers are favored and valued by the fiber manufacturing industry.
Although the FDY yarn of the side-by-side bicomponent fiber is widely used in woven fabrics, very troublesome problems arise in advancing the fiber to be more widely used in the knitting field: because the side-by-side bicomponent fiber forms a regular spiral crimp structure during heat shrinkage, the surface of the woven knitted fabric has random strip-shaped uneven shade, and the method is particularly obvious on plain knitted fabrics. The problem causes that the parallel type bicomponent fiber can not be applied to a plurality of knitted products, so that the knitted fabric of the parallel type bicomponent fiber is evaluated to be a low-grade product with uneven evenness once, and the development and application of the knitted fabric of the parallel type bicomponent fiber are seriously restricted.
Therefore, it is very important to develop a side-by-side bicomponent fiber which avoids the occurrence of random "stripe-like unevenness".
Disclosure of Invention
The invention provides a PET/modified PET double-component elastic yarn and a preparation method thereof, and aims to solve the problem that random strip shade unevenness occurs when side-by-side double-component composite fibers are applied to knitted fabric products in the prior art. The invention adopts a mode of making PET/PET-PA6 copolymer parallel composite monofilament and PET monofilament coexist in a bundle of fiber, and because the shrinkage modes and forms of PET/PET-PA6 copolymer parallel composite fiber are different, the invention breaks through the problem that pure PET/PET-PA6 copolymer parallel composite fiber forms neat left and right spiral forms, and the prepared knitted fabric has no uneven strip shade.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the preparation method of the PET/modified PET double-component elastic yarn comprises the steps of extruding the PET/modified PET double-component elastic yarn on the same spinneret plate;
splitting the PET melt into two paths: one path is directly extruded after being distributed; the other path is distributed together with the PET-PA6 copolymer melt according to a parallel composite spinning mode and then extruded;
the number ratio of the spinneret orifices m for directly extruding flow to the spinneret orifices n for extruding flow after being distributed in the parallel composite spinning mode is 1: 6-7;
and (3) preparing FDY yarns according to an FDY process after extrusion, and then carrying out relaxation heat treatment to obtain the PET/modified PET double-component elastic yarns.
Specifically, the PET melt is divided into two paths, one path is directly extruded after being distributed, the other path and the PET-PA6 copolymer melt are distributed together in a parallel composite spinning mode and then extruded, so that PET monofilaments and PET/PET-PA6 copolymer composite monofilaments coexist in a bundle of fibers, and correspondingly, the number and the position relation of distribution holes and guide holes are reasonably set to ensure the smooth operation of the division; the invention ensures that the proportion of PET monofilament part in the whole is appropriate by controlling the ratio of the number of the spinneret orifices m which directly extrude and flow through and the number of the spinneret orifices n which extrude and flow through after being distributed according to the parallel composite spinning mode, thereby not only effectively solving the problem of uneven strip shade, but also keeping the excellent performance of the PET/PET-PA6 copolymer parallel composite fiber; the invention distributes the spinneret orifices m and the spinneret orifices n according to the concentric circles, controls the spinneret orifices m to be positioned at the inner ring of the concentric circles as much as possible, ensures that PET monofilaments can be fully doped into the PET/PET-PA6 copolymer parallel composite fibers, and plays a role in breaking the pure PET/PET-PA6 copolymer parallel composite fibers to form a neat left-and right-spiral shape; the temperature of the spinning manifold I, the temperature of the spinning manifold II and the temperature of the spinning manifold III are reasonably set, so that the temperature of the spinning manifold I, the temperature of the spinning manifold II and the temperature of the spinning manifold III can be matched with the intrinsic viscosity (0.50-0.58 dL/g) of a PET melt and the intrinsic viscosity (0.57-0.65 dL/g) of a PET-PA6 copolymer melt, the apparent viscosities of a PET component extruded from a spinneret orifice and a PET-PA6 copolymer component are relatively close, and the smooth spinning is ensured; the shape of the spinneret orifice is not required to be adjusted, and the common single-component spinneret orifice and the parallel composite spinneret orifice are selected; the invention selects the FDY spinning process and reasonably sets the spinning process parameters, and the prepared product has good crimpling performance, good elasticity and better comprehensive performance.
The principle of the invention is as follows:
the invention is a combined filament yarn composed of PET fiber and PET/PET-PA6 copolymer parallel composite fiber, the PET/PET-PA6 copolymer parallel composite fiber obtains three-dimensional curled fiber after relaxation heat treatment, there is neat left and right spiral shape, and the PET fiber does not curl after relaxation heat treatment, the combined filament yarn composed of PET monofilament and PET/PET-PA6 copolymer parallel composite monofilament is equivalent to replacing PET/PET-PA6 copolymer parallel composite monofilament with partial PET monofilament, thereby breaking the neat left and right spiral shape of pure PET/PET-PA6 copolymer parallel composite fiber; in the same mixed filament bundle, the number ratio of PET monofilaments (corresponding to the spinneret orifices m) to PET/PET-PA6 copolymer parallel composite monofilaments (corresponding to the spinneret orifices n) is 1: 6-7, the PET monofilaments have the function of breaking and forming a neat left and right spiral form, the PET/PET-PA6 copolymer parallel composite monofilaments have the function of providing elasticity for the mixed filament bundle through self-curling, too many PET monofilaments cannot well reflect the performance of the composite filaments, too few PET monofilaments cannot play the function of breaking and forming the neat left and right spiral form, the PET monofilaments and the PET/PET-PA6 copolymer parallel composite monofilaments are mixed according to a specific proportion, the elasticity of the mixed filament bundle is ensured, the neat left and right spiral form formed by the PET/PET-PA6 copolymer parallel composite monofilaments is broken, the curling form of each PET/PA 6 copolymer parallel composite monofilament in the multifilament bundle after relaxation heat treatment is different from other fibers, thereby eliminating the uneven shape of the bar-shaped yin.
As a preferred technical scheme:
according to the preparation method of the PET/modified PET bicomponent elastic yarn, the mass ratio of the PET melt passing through the spinneret orifice n to the PET-PA6 copolymer melt is 50:50, and the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1.
According to the preparation method of the PET/modified PET bicomponent elastic yarn, the spinneret holes m are circular, oval, triangular, Y-shaped, cross-shaped, 8-shaped, rectangular or straight spinneret holes, and the spinneret holes n are circular, oval or 8-shaped spinneret holes.
According to the preparation method of the PET/modified PET bicomponent elastic yarn, all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the outermost circle are n, so that PET monofilaments are mixed into the middle of PET/modified PET parallel composite monofilaments, and the effect of forming a neat left and right spiral shape is achieved; otherwise, more PET monofilaments are distributed at the outermost circle, so that the inner PET/modified PET parallel composite monofilaments still have neat left and right spiral shapes.
According to the preparation method of the PET/modified PET double-component elastic yarn, the parameters of the FDY process are as follows: the cooling temperature is 20-25 ℃, the network pressure is 0.20-0.30 MPa, the first roller speed is 2200-2400 m/min, the first roller temperature is 70-80 ℃, the second roller speed is 3500-3800 m/min, the second roller temperature is 125-130 ℃, and the winding speed is 3430-3710 m/min; the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
According to the preparation method of the PET/modified PET bicomponent elastic yarn, the spinneret orifice m is composed of the guide hole E, the transition hole and the capillary micropore which are connected in sequence, the spinneret orifice n is composed of the guide hole D, the transition hole and the capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the split stream is to transport the PET melt through spinning beam I to distribution opening A and distribution opening B, and simultaneously transport the PET-PA6 copolymer melt through spinning beam II to distribution opening C.
According to the preparation method of the PET/modified PET double-component elastic yarn, the intrinsic viscosity of a PET melt is 0.50-0.58 dL/g, the temperature of a spinning box I is 277-283 ℃, the intrinsic viscosity of a PET-PA6 copolymer melt is 0.57-0.65 dL/g, the temperature of a spinning box II is 271-274 ℃, and the temperature of a spinning box III is 270-280 ℃ (the temperature of the spinning box III is the spinning temperature). In order to ensure smooth spinning, it is necessary to ensure that the two components have the same flow state when extruded from the same spinneret orifice, i.e. the apparent viscosity of the melt is close (generally, the greater the apparent viscosity, the poorer the flow property); the invention reasonably sets the temperature of a spinning component box, the temperature of a PET melt spinning box and the temperature of a PET-PA6 copolymer melt spinning box, so that the apparent viscosity of the PET and PET-PA6 copolymer can be matched with the intrinsic viscosity of a PET melt and the intrinsic viscosity of a PET-PA6 copolymer melt, PET is melted at high temperature and spun at low temperature, and a PET-PA6 copolymer is melted at low temperature and spun at high temperature, so that the degradation of the PET-PA6 copolymer can be reduced, although the temperature difference of the two components in the box is larger, the two components enter the same composite component to exchange heat, the temperature of the PET component is reduced, the temperature of the PET-PA6 copolymer component is increased, and the apparent viscosities of the two components extruded from a spinneret orifice are close to the same, so that the smooth spinning can be ensured.
The invention also provides the PET/modified PET double-component elastic yarn prepared by the preparation method of the PET/modified PET double-component elastic yarn, which consists of PET monofilament and PET/PET-PA6 copolymer parallel composite monofilament; the curling directions of the monofilaments in the PET/modified PET double-component elastic yarn are randomly distributed, and the random distribution is a mathematical concept, namely the curling form of each fiber is different from that of other fibers, so that the prepared fabric has no strip-shaped uneven shape.
As a preferred technical scheme:
according to the PET/modified PET bicomponent elastic yarn, the PET/modified PET bicomponent elastic yarn has the crimping shrinkage rate of 48-53%, the crimping stability of 85-87%, the contraction elongation of 88-90% and the crimping elastic recovery rate of 91-93%.
According to the PET/modified PET double-component elastic yarn, the breaking strength of the PET/modified PET double-component elastic yarn is more than or equal to 2.8cN/dtex, the elongation at break is 50.0 +/-5.0%, and the total titer is 70-200 dtex.
Preparing the prepared PET/modified PET double-component elastic yarn into a knitted fabric, and testing the uneven condition of the strip shade of the knitted fabric, wherein the testing process comprises the following steps: firstly, acquiring a knitted fabric image, converting the knitted fabric image into a gray image, then performing first processing and second processing on the gray image, and calculating a parameter D, and representing the uneven degree of the strip shadow shape by using the parameter D, wherein the gray image comprises a strip shadow area, a high gray value area of a non-strip shadow area and a low gray value area of the non-strip shadow area; the first processing is to change the pixel points of the high gray value area of the non-strip shadow area in the gray image into pure white points; the second processing is to change the pixel points of the low gray value area of the non-shadow area in the gray image into pure white points; the calculation formula of the parameter D is as follows: d ═ Σ B/a, where Σ B represents the number of pixels having a gray scale value of 0 in the grayscale image, and a represents the total number of pixels in the grayscale image.
If the D value is more than or equal to 3%, the strip shade unevenness can be judged to appear, and if the D value is more than or equal to 10%, the strip shade unevenness can be judged to appear seriously. The test result of the knitted fabric made of the PET/modified PET double-component elastic yarn of the invention is as follows: the D value of the knitted fabric made of the PET/modified PET double-component elastic yarn is less than or equal to 1.0 percent; this shows that the knitted fabric made of the PET/modified PET bicomponent elastic yarn of the invention has no problem of uneven stripe shape.
Has the advantages that:
(1) according to the preparation method of the PET/modified PET double-component elastic yarn, the double-component elastic yarn consisting of PET fibers and PET/PET-PA6 copolymer side-by-side composite fibers is adopted, and the spiral crimp state of single fibers in the multifilament is changed after relaxation heat treatment, so that the crimp state of each fiber is different from that of other fibers;
(2) according to the preparation method of the PET/modified PET double-component elastic yarn, the double-component elastic yarn consisting of the PET fibers and the PET/PET-PA6 copolymer parallel composite fibers cannot form regular arrangement of spiral curling, and the problem of uneven strip shade does not exist in the knitted fabric prepared from the double-component elastic yarn;
(3) the PET/modified PET double-component elastic yarn prepared by the preparation method of the PET/modified PET double-component elastic yarn has good comprehensive performance and wide application range.
Drawings
FIG. 1 is a schematic view of the melt distribution of the present invention; wherein A, B and C are independent dispensing holes, and D and E are independent guide holes.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The crimp shrinkage and crimp stability of the invention are obtained by testing the tow in GB6506-2001 synthetic fiber textured yarn crimp performance test method;
the method for testing the shrinkage elongation (reflecting the elasticity and the crimp degree of the deformed filament, the fiber is firstly loaded under light load and then loaded under heavy load, and the ratio of the length difference value under the two loads to the crimp length) and the crimp elastic recovery rate is as follows:
firstly, cutting two fiber samples with the length of about 50cm, putting the two fiber samples into hot water with the temperature of 100 ℃ for treatment for 30min, taking out the two fiber samples, naturally drying the two fiber samples, then cutting the sample with the length of about 30cm, fixing one end of the sample, loading a load of 0.0018cN/dtex on the other end of the sample, continuing for 30s, marking the sample at the position of 20cm, and obtaining the initial length l of the sample1(ii) a Then, the load of 0.09cN/dtex is loaded for 30s, and the position of the mark point is measured, namely the length l when the sample is loaded with heavy load2(ii) a Finally, removing the heavy load, retracting the sample for 2min without load, then adding the load of 0.0018cN/dtex, continuing for 30s, and measuring the position of the mark point on the scale, namely the recovery length l3(ii) a The percent elongation at Compression (CE) and the elastic recovery from crimp (SR) are calculated as follows:
CE＝(l2-l1)/l1；
SR＝(l2-l3)/(l2-l1)。
example 1
The preparation method of the PET/modified PET double-component elastic yarn comprises the following preparation processes:
(1) extruding the PET/modified PET double-component elastic yarns on the same spinneret plate; specifically, the method comprises the following steps:
the PET melt (intrinsic viscosity 0.5dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with PET-PA6 copolymer melt (the intrinsic viscosity is 0.65dL/g, and the mass ratio of the PET melt in the hole is 50:50) in a parallel composite spinning mode;
the number ratio of the spinneret orifices m (circular) through which the direct extrusion flows to the spinneret orifices 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 spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1; all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
as shown in fig. 1, the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the splitting is to convey the PET melt to a distribution hole A and a distribution hole B through a spinning beam I, and simultaneously convey the PET-PA6 copolymer melt to a distribution hole C through a spinning beam II;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET/modified PET double-component elastic yarns;
the FDY process comprises the following parameters: the temperature of the spinning manifold I is 282 ℃, the temperature of the spinning manifold II is 274 ℃, the temperature of the spinning manifold III is 280 ℃, the cooling temperature is 25 ℃, the network pressure is 0.2MPa, the one-roll speed is 2300m/min, the one-roll temperature is 70 ℃, the two-roll speed is 3560m/min, the two-roll temperature is 125 ℃, and the winding speed is 3480 m/min; the temperature of the relaxation heat treatment is 104 ℃, and the time is 30 min;
the prepared PET/modified PET double-component elastic yarn consists of PET monofilament and PET/PET-PA6 copolymer parallel composite monofilament; the single filaments in the PET/modified PET double-component elastic filament are randomly distributed in the curling direction; the PET/modified PET double-component elastic yarn has the crimp shrinkage of 53%, the crimp stability of 87%, the shrinkage elongation of 90% and the crimp elastic recovery of 93%; the PET/modified PET double-component elastic yarn has the breaking strength of 3.4cN/dtex, the elongation at break of 45 percent and the total titer of 130 dtex.
The PET/modified PET double-component elastic yarn prepared in the above way is made into a knitted fabric, and the condition of uneven strip shade of the knitted fabric is tested, wherein the D value of the knitted fabric made of the PET/modified PET double-component elastic yarn is 0.54%.
Example 2
The preparation method of the PET/modified PET double-component elastic yarn comprises the following preparation processes:
(1) extruding the PET/modified PET double-component elastic yarns on the same spinneret plate; specifically, the method comprises the following steps:
the PET melt (intrinsic viscosity 0.56dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with PET-PA6 copolymer melt (the intrinsic viscosity is 0.63dL/g, and the mass ratio of the PET melt in the hole is 50:50) in a parallel composite spinning mode;
the number ratio of the spinneret orifices m (oval) for direct extrusion flowing to the spinneret orifices n (round) for extrusion flowing after being distributed in the parallel composite spinning mode is 1: 6; the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1; all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the splitting is to convey the PET melt to a distribution hole A and a distribution hole B through a spinning beam I, and simultaneously convey the PET-PA6 copolymer melt to a distribution hole C through a spinning beam II;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET/modified PET double-component elastic yarns;
the FDY process comprises the following parameters: the temperature of the spinning beam I is 280 ℃, the temperature of the spinning beam II is 271 ℃, the temperature of the spinning beam III is 270 ℃, the cooling temperature is 20 ℃, the network pressure is 0.25MPa, the first-roller speed is 2350m/min, the first-roller temperature is 80 ℃, the second-roller speed is 3660m/min, the second-roller temperature is 130 ℃, and the winding speed is 3570 m/min; the temperature of the relaxation heat treatment is 103 ℃, and the time is 28 min;
the prepared PET/modified PET double-component elastic yarn consists of PET monofilament and PET/PET-PA6 copolymer parallel composite monofilament; the single filaments in the PET/modified PET double-component elastic filament are randomly distributed in the curling direction; the PET/modified PET double-component elastic yarn has the crimp shrinkage rate of 52.8 percent, the crimp stability of 85 percent, the shrinkage elongation of 89 percent and the crimp elastic recovery rate of 91.4 percent; the PET/modified PET double-component elastic yarn has the breaking strength of 3.15cN/dtex, the elongation at break of 46% and the total fineness of 115 dtex.
The PET/modified PET double-component elastic yarn prepared in the above way is made into a knitted fabric, and the condition of uneven strip shade of the knitted fabric is tested, wherein the D value of the knitted fabric made of the PET/modified PET double-component elastic yarn is 0.82%.
Example 3
The preparation method of the PET/modified PET double-component elastic yarn comprises the following preparation processes:
(1) extruding the PET/modified PET double-component elastic yarns on the same spinneret plate; specifically, the method comprises the following steps:
the PET melt (intrinsic viscosity 0.58dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with PET-PA6 copolymer melt (the intrinsic viscosity is 0.63dL/g, and the mass ratio of the PET melt in the hole is 50:50) in a parallel composite spinning mode;
the number ratio of the spinneret orifices m (triangles) for directly extruding and flowing through to the spinneret orifices n (circles) for extruding and flowing through after being distributed in the parallel composite spinning mode is 1: 7; the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1; all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the splitting is to convey the PET melt to a distribution hole A and a distribution hole B through a spinning beam I, and simultaneously convey the PET-PA6 copolymer melt to a distribution hole C through a spinning beam II;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET/modified PET double-component elastic yarns;
the FDY process comprises the following parameters: the temperature of the spinning beam I is 280 ℃, the temperature of the spinning beam II is 274 ℃, the temperature of the spinning beam III is 276 ℃, the cooling temperature is 21 ℃, the network pressure is 0.23MPa, the one-roll speed is 2300m/min, the one-roll temperature is 76 ℃, the two-roll speed is 3500m/min, the two-roll temperature is 127 ℃, and the winding speed is 3430 m/min; the temperature of the relaxation heat treatment is 120 ℃, and the time is 29 min;
the prepared PET/modified PET double-component elastic yarn consists of PET monofilament and PET/PET-PA6 copolymer parallel composite monofilament; the single filaments in the PET/modified PET double-component elastic filament are randomly distributed in the curling direction; the PET/modified PET double-component elastic yarn has the crimp shrinkage rate of 52 percent, the crimp stability of 85.5 percent, the shrinkage elongation of 88 percent and the crimp elastic recovery rate of 91.1 percent; the PET/modified PET double-component elastic yarn has the breaking strength of 3cN/dtex, the elongation at break of 51.2 percent and the total titer of 125 dtex.
The PET/modified PET double-component elastic yarn prepared in the above way is made into a knitted fabric, and the condition of uneven strip shade of the knitted fabric is tested, wherein the D value of the knitted fabric made of the PET/modified PET double-component elastic yarn is 0.38%.
Example 4
The preparation method of the PET/modified PET double-component elastic yarn comprises the following preparation processes:
(1) extruding the PET/modified PET double-component elastic yarns on the same spinneret plate; specifically, the method comprises the following steps:
the PET melt (intrinsic viscosity 0.55dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with PET-PA6 copolymer melt (the intrinsic viscosity is 0.57dL/g, and the mass ratio of the PET melt in the hole is 50:50) in a parallel composite spinning mode;
the number ratio of the spinneret orifices m (Y shape) through which the direct extrusion flows to the spinneret orifices n (round shape) through which the extrusion flows after being distributed in the parallel composite spinning mode is 1: 6; the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1; all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the splitting is to convey the PET melt to a distribution hole A and a distribution hole B through a spinning beam I, and simultaneously convey the PET-PA6 copolymer melt to a distribution hole C through a spinning beam II;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET/modified PET double-component elastic yarns;
the FDY process comprises the following parameters: the temperature of the spinning box I is 282 ℃, the temperature of the spinning box II is 271 ℃, the temperature of the spinning box III is 280 ℃, the cooling temperature is 23 ℃, the network pressure is 0.24MPa, the first-roller speed is 2250m/min, the first-roller temperature is 78 ℃, the second-roller speed is 3800m/min, the second-roller temperature is 128 ℃, and the winding speed is 3710 m/min; the temperature of the relaxation heat treatment is 90 ℃ and the time is 24 min;
the prepared PET/modified PET double-component elastic yarn consists of PET monofilament and PET/PET-PA6 copolymer parallel composite monofilament; the single filaments in the PET/modified PET double-component elastic filament are randomly distributed in the curling direction; the PET/modified PET double-component elastic yarn has the crimp shrinkage rate of 52.5 percent, the crimp stability of 85.3 percent, the shrinkage elongation of 88.7 percent and the crimp elastic recovery rate of 91.5 percent; the PET/modified PET double-component elastic yarn has the breaking strength of 3.3cN/dtex, the elongation at break of 46.5 percent and the total titer of 95 dtex.
The PET/modified PET double-component elastic yarn prepared in the above way is made into a knitted fabric, and the condition of uneven strip shade of the knitted fabric is tested, wherein the D value of the knitted fabric made of the PET/modified PET double-component elastic yarn is 0.76%.
Example 5
The preparation method of the PET/modified PET double-component elastic yarn comprises the following preparation processes:
(1) extruding the PET/modified PET double-component elastic yarns on the same spinneret plate; specifically, the method comprises the following steps:
the PET melt (intrinsic viscosity 0.53dL/g) was split into two paths: one path is directly extruded after being distributed; the other path of the melt is distributed and extruded together with PET-PA6 copolymer melt (the intrinsic viscosity is 0.64dL/g, and the mass ratio of the PET melt in the hole is 50:50) in a parallel composite spinning mode;
the number ratio of the spinneret orifices m (cross shape) through which the direct extrusion flows to the spinneret orifices n (oval shape) 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 spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1; all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the splitting is to convey the PET melt to a distribution hole A and a distribution hole B through a spinning beam I, and simultaneously convey the PET-PA6 copolymer melt to a distribution hole C through a spinning beam II;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET/modified PET double-component elastic yarns;
the FDY process comprises the following parameters: the temperature of the spinning box I is 283 ℃, the temperature of the spinning box II is 272 ℃, the temperature of the spinning box III is 273 ℃, the cooling temperature is 24 ℃, the network pressure is 0.28MPa, the speed of one roller is 2265m/min, the temperature of one roller is 77 ℃, the speed of two rollers is 3680m/min, the temperature of two rollers is 126 ℃, and the winding speed is 3560 m/min; the temperature of the relaxation heat treatment is 105 ℃, and the time is 25 min;
the prepared PET/modified PET double-component elastic yarn consists of PET monofilament and PET/PET-PA6 copolymer parallel composite monofilament; the single filaments in the PET/modified PET double-component elastic filament are randomly distributed in the curling direction; the PET/modified PET double-component elastic yarn has the crimp shrinkage rate of 50.6 percent, the crimp stability of 85.2 percent, the shrinkage elongation of 89 percent and the crimp elastic recovery of 91.8 percent; the PET/modified PET double-component elastic yarn has the breaking strength of 3.1cN/dtex, the elongation at break of 48 percent and the total titer of 70 dtex.
The PET/modified PET double-component elastic yarn prepared in the above way is made into a knitted fabric, and the condition of uneven strip shade of the knitted fabric is tested, wherein the D value of the knitted fabric made of the PET/modified PET double-component elastic yarn is 0.23%.
Example 6
The preparation method of the PET/modified PET double-component elastic yarn comprises the following preparation processes:
(1) extruding the PET/modified PET double-component elastic yarns on the same spinneret plate; specifically, the method comprises the following steps:
the PET melt (intrinsic viscosity 0.54dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with PET-PA6 copolymer melt (the intrinsic viscosity is 0.62dL/g, and the mass ratio of the PET melt in the hole is 50:50) in a parallel composite spinning mode;
the number ratio of the spinneret orifices m (8-shaped) of the direct extrusion flow to the spinneret orifices n (oval) of the extrusion flow after being distributed in the parallel composite spinning mode is 1: 6; the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1; all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the splitting is to convey the PET melt to a distribution hole A and a distribution hole B through a spinning beam I, and simultaneously convey the PET-PA6 copolymer melt to a distribution hole C through a spinning beam II;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET/modified PET double-component elastic yarns;
the FDY process comprises the following parameters: the temperature of the spinning beam I is 277 ℃, the temperature of the spinning beam II is 271 ℃, the temperature of the spinning beam III is 279 ℃, the cooling temperature is 25 ℃, the network pressure is 0.3MPa, the speed of one roller is 2200m/min, the temperature of one roller is 75 ℃, the speed of two rollers is 3660m/min, the temperature of two rollers is 128 ℃, and the winding speed is 3610 m/min; the temperature of the relaxation heat treatment is 104 ℃, and the time is 20 min;
the prepared PET/modified PET double-component elastic yarn consists of PET monofilament and PET/PET-PA6 copolymer parallel composite monofilament; the single filaments in the PET/modified PET double-component elastic filament are randomly distributed in the curling direction; the PET/modified PET double-component elastic yarn has the crimp shrinkage rate of 48%, the crimp stability of 85%, the shrinkage elongation of 89.7% and the crimp elastic recovery rate of 91%; the PET/modified PET double-component elastic yarn has the breaking strength of 3.3cN/dtex, the elongation at break of 47 percent and the total titer of 105 dtex.
The PET/modified PET double-component elastic yarn prepared in the above way is made into a knitted fabric, and the condition of uneven strip shade of the knitted fabric is tested, wherein the D value of the knitted fabric made of the PET/modified PET double-component elastic yarn is 0.62%.
Example 7
The preparation method of the PET/modified PET double-component elastic yarn comprises the following preparation processes:
(1) extruding the PET/modified PET double-component elastic yarns on the same spinneret plate; specifically, the method comprises the following steps:
the PET melt (intrinsic viscosity 0.5dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with PET-PA6 copolymer melt (the intrinsic viscosity is 0.59dL/g, and the mass ratio of the PET melt in the hole is 50:50) in a parallel composite spinning mode;
the number ratio of the spinneret orifices m (rectangle) of the direct extrusion flow to the spinneret orifices n (8 shape) of the extrusion flow after being distributed in the parallel composite spinning mode is 1: 6; the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1; all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the splitting is to convey the PET melt to a distribution hole A and a distribution hole B through a spinning beam I, and simultaneously convey the PET-PA6 copolymer melt to a distribution hole C through a spinning beam II;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET/modified PET double-component elastic yarns;
the FDY process comprises the following parameters: the temperature of the spinning beam I is 279 ℃, the temperature of the spinning beam II is 271 ℃, the temperature of the spinning beam III is 278 ℃, the cooling temperature is 24 ℃, the network pressure is 0.22MPa, the speed of one roller is 2400m/min, the temperature of one roller is 75 ℃, the speed of two rollers is 3550m/min, the temperature of two rollers is 126 ℃, and the winding speed is 3460 m/min; the temperature of the relaxation heat treatment is 114 ℃, and the time is 23 min;
the prepared PET/modified PET double-component elastic yarn consists of PET monofilament and PET/PET-PA6 copolymer parallel composite monofilament; the single filaments in the PET/modified PET double-component elastic filament are randomly distributed in the curling direction; the PET/modified PET double-component elastic yarn has the crimp shrinkage rate of 52 percent, the crimp stability of 86 percent, the shrinkage elongation of 88 percent and the crimp elastic recovery rate of 92.3 percent; the PET/modified PET double-component elastic yarn has the breaking strength of 2.8cN/dtex, the elongation at break of 55 percent and the total titer of 116 dtex.
The PET/modified PET double-component elastic yarn prepared in the above way is made into a knitted fabric, and the condition of uneven strip shade of the knitted fabric is tested, wherein the D value of the knitted fabric made of the PET/modified PET double-component elastic yarn is 0.54%.
Example 8
The preparation method of the PET/modified PET double-component elastic yarn comprises the following preparation processes:
(1) extruding the PET/modified PET double-component elastic yarns on the same spinneret plate; specifically, the method comprises the following steps:
the PET melt (intrinsic viscosity 0.51dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with PET-PA6 copolymer melt (the intrinsic viscosity is 0.65dL/g, and the mass ratio of the PET melt in the hole is 50:50) in a parallel composite spinning mode;
the number ratio of the spinneret orifices m (in-line) of the direct extrusion flow to the spinneret orifices n (in-line) of the extrusion flow distributed in the parallel composite spinning mode is 1: 6; the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1; all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the splitting is to convey the PET melt to a distribution hole A and a distribution hole B through a spinning beam I, and simultaneously convey the PET-PA6 copolymer melt to a distribution hole C through a spinning beam II;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET/modified PET double-component elastic yarns;
the FDY process comprises the following parameters: the temperature of the spinning box I is 283 ℃, the temperature of the spinning box II is 273 ℃, the temperature of the spinning box III is 278 ℃, the cooling temperature is 20 ℃, the network pressure is 0.27MPa, the first-roller speed is 2380m/min, the first-roller temperature is 76 ℃, the second-roller speed is 3650m/min, the second-roller temperature is 126 ℃, and the winding speed is 3560 m/min; the temperature of the relaxation heat treatment is 101 ℃, and the time is 29 min;
the prepared PET/modified PET double-component elastic yarn consists of PET monofilament and PET/PET-PA6 copolymer parallel composite monofilament; the single filaments in the PET/modified PET double-component elastic filament are randomly distributed in the curling direction; the PET/modified PET double-component elastic yarn has the crimp shrinkage rate of 52.7 percent, the crimp stability of 85.8 percent, the shrinkage elongation of 88 percent and the crimp elastic recovery of 92.1 percent; the PET/modified PET double-component elastic yarn has the breaking strength of 3.2cN/dtex, the elongation at break of 47.5 percent and the total titer of 200 dtex.
The PET/modified PET double-component elastic yarn prepared in the above way is made into a knitted fabric, and the condition of uneven strip shade of the knitted fabric is tested, wherein the D value of the knitted fabric made of the PET/modified PET double-component elastic yarn is 0.67%.

Claims (8)

  1. The preparation method of the PET/modified PET double-component elastic yarn is characterized by comprising the following steps: extruding the PET/modified PET double-component elastic yarns on the same spinneret plate;
    splitting the PET melt into two paths: one path is directly extruded after being distributed; the other path is distributed together with the PET-PA6 copolymer melt according to a parallel composite spinning mode and then extruded;
    the number ratio of the spinneret orifices m for directly extruding flow to the spinneret orifices n for extruding flow after being distributed in the parallel composite spinning mode is 1: 6-7; all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
    the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the shunting is to convey the PET melt to a distribution hole A and a distribution hole B through a spinning beam I, and simultaneously convey the PET-PA6 copolymer melt to a distribution hole C through a spinning beam II
    Preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET/modified PET double-component elastic yarns; the single filaments in the PET/modified PET double-component elastic filament are randomly distributed in the curling direction;
    the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
  2. 2. The method for preparing PET/modified PET bicomponent elastic yarn as claimed in claim 1, wherein the mass ratio of PET melt passing through the spinneret n to PET-PA6 copolymer melt is 50:50, and the ratio of the equivalent diameter of the spinneret m to the equivalent diameter of the spinneret n is 1: 1.
  3. 3. The method for preparing PET/modified PET bicomponent elastic yarn according to claim 1, wherein the spinneret hole m is a circular, oval, triangular, Y-shaped, cross-shaped, "8" -shaped, rectangular or in-line spinneret hole, and the spinneret hole n is a circular, oval or "8" -shaped spinneret hole.
  4. 4. The method for preparing the PET/modified PET bicomponent elastic yarn as claimed in claim 1, wherein the parameters of the FDY process are as follows: the cooling temperature is 20-25 ℃, the network pressure is 0.20-0.30 MPa, the first roller speed is 2200-2400 m/min, the first roller temperature is 70-80 ℃, the second roller speed is 3500-3800 m/min, the second roller temperature is 125-130 ℃, and the winding speed is 3430-3710 m/min.
  5. 5. The preparation method of the PET/modified PET bicomponent elastic yarn as claimed in claim 4, wherein the intrinsic viscosity of the PET melt is 0.50-0.58 dL/g, the temperature of the spinning beam I is 277-283 ℃, the intrinsic viscosity of the PET-PA6 copolymer melt is 0.57-0.65 dL/g, the temperature of the spinning beam II is 271-274 ℃, and the temperature of the spinning beam III is 270-280 ℃.
  6. 6. The PET/modified PET bicomponent elastic yarn prepared by the preparation method of the PET/modified PET bicomponent elastic yarn as claimed in any one of claims 1 to 5, which is characterized in that: consists of PET monofilament and PET/PET-PA6 copolymer composite monofilament.
  7. 7. The PET/modified PET bicomponent elastic yarn according to claim 6, wherein the PET/modified PET bicomponent elastic yarn has a crimp shrinkage of 48 to 53%, a crimp stability of 85 to 87%, a reduction elongation of 88 to 90%, and a crimp elastic recovery of 91 to 93%.
  8. 8. The PET/modified PET bicomponent elastic yarn according to claim 6, wherein the PET/modified PET bicomponent elastic yarn has a breaking strength of not less than 2.8cN/dtex, an elongation at break of 50.0 ± 5.0%, and a total fineness of 70-200 dtex.
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