CN111118665B - Polyester-nylon composite yarn and preparation method thereof - Google Patents

Polyester-nylon composite yarn and preparation method thereof Download PDF

Info

Publication number
CN111118665B
CN111118665B CN201911351550.7A CN201911351550A CN111118665B CN 111118665 B CN111118665 B CN 111118665B CN 201911351550 A CN201911351550 A CN 201911351550A CN 111118665 B CN111118665 B CN 111118665B
Authority
CN
China
Prior art keywords
melt
pet
distribution
hole
polyester
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201911351550.7A
Other languages
Chinese (zh)
Other versions
CN111118665A (en
Inventor
汤方明
魏存宏
王山水
范红卫
陈瑞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Hengli Chemical Fiber Co Ltd
Original Assignee
Jiangsu Hengli Chemical Fiber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Hengli Chemical Fiber Co Ltd filed Critical Jiangsu Hengli Chemical Fiber Co Ltd
Priority to CN201911351550.7A priority Critical patent/CN111118665B/en
Publication of CN111118665A publication Critical patent/CN111118665A/en
Application granted granted Critical
Publication of CN111118665B publication Critical patent/CN111118665B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • 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
    • 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

Abstract

The invention relates to a polyester-polyamide composite filament and a preparation method thereof, according to the FDY process, after PET melt and PA6 melt are distributed, FDY filaments are prepared by extruding from a spinneret orifice m and a spinneret orifice n on the same spinneret plate and then are subjected to relaxation heat treatment; the PET melt and the PA6 melt flow to a spinneret orifice m through a distribution orifice A, B and flow to a spinneret orifice n through a distribution orifice C, D, the difference between the apparent viscosities of the PET melt and the PA6 melt is not more than 5% at the inlet of each distribution orifice, the distribution orifices A and B are cylindrical orifices with equal heights, the diameter ratio is 1.10-1.30: 1, the distribution orifices C and D are cylindrical orifices with equal heights, and the diameter ratio is 1: 1.10-1.30; the prepared polyester-nylon composite filament consists of a plurality of PA6/PET parallel composite filaments with two proportions, and the curling directions of the filaments in the composite filament are randomly distributed. The invention solves the problem of uneven stripe shade of the PA6/PET parallel composite fiber in the knitted fabric.

Description

Polyester-nylon composite yarn and preparation method thereof
Technical Field
The invention belongs to the technical field of composite fibers, and relates to a polyester-nylon composite yarn and a preparation method thereof.
Background
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.
When the polyester fiber and the nylon fiber are compounded, the prepared composite yarn has the advantages of wear resistance, high strength, easiness in dyeing and moisture absorption of the nylon, has the advantages of good polyester elasticity, good shape retention, stiffness and smoothness and non-ironing property, and can be applied to cleaning articles and home textile articles. However, when the PA6/PET side-by-side bicomponent fiber is applied to the knitting field, a very troublesome problem occurs: 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 PA6/PET side-by-side bicomponent fiber which avoids the occurrence of random strip-shaped unevenness.
Disclosure of Invention
The invention provides a polyester-nylon composite yarn and a preparation method thereof, and aims to solve the problem that random strip shade unevenness occurs when PA6/PET parallel composite fibers are applied to knitted fabric products in the prior art. According to the invention, a mode that PA6/PET parallel composite monofilament with the mass ratio of PA6 to PET of 3: 2-3: 1 and PA6/PET parallel composite monofilament with the mass ratio of PA6 to PET of 2: 3-1: 3 coexist is adopted, and due to the fact that the contraction modes and forms of two PA6/PET parallel composite fibers with different mass ratios of PA6 to PET are different, a bundle of PA6/PET parallel composite fibers is broken into a neat left and right spiral form, and the problem of 'uneven stripe shade' of a knitted fabric made of a bundle of PA6/PET parallel composite fibers is solved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for preparing polyester-polyamide composite filament, according to FDY technology, after PET melt and PA6 melt are distributed, extrude and make the polyester-polyamide composite filament from spinneret orifice m and spinneret orifice n on the same spinneret plate;
the distribution refers to that PA6 melt is distributed into a spinneret orifice m through a distribution orifice A, PET melt is distributed into a spinneret orifice m through a distribution orifice B, PA6 melt is distributed into a spinneret orifice n through a distribution orifice C, and PET melt is distributed into a spinneret orifice n through a distribution orifice D;
at the entrance of distribution orifice a, distribution orifice B, distribution orifice C and distribution orifice D, the apparent viscosities of the PET melt and of the PA6 melt differ by not more than 5% (apparent viscosities being determined by simulation, in particular by measuring the apparent viscosity of the polymer melt at a specific temperature using a rheometer);
the distribution hole A and the distribution hole B are equal-height cylindrical holes, the diameter ratio of the distribution hole A to the distribution hole B is 1.10-1.30: 1, the distribution hole C and the distribution hole D are equal-height cylindrical holes, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.10-1.30.
Specifically, PA6 melt is distributed through distribution holes A and C and PET melt is distributed through distribution holes B and D and is arranged at inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosity difference between the PET melt and the PA6 melt is not more than 5%, each distribution hole is a cylindrical hole with the same height, and the diameter ratio of the distribution hole A to the distribution hole B is not equal to the diameter ratio of the distribution hole C to the distribution hole D, so that the mass ratio of the PA6 melt to the PET melt distributed into a spinneret hole m and the mass ratio of the PA6 melt to the PET melt distributed into a spinneret hole n are different, two different mass ratios of PA6 to the PET in one beam of PA6/PET parallel composite fibers are realized, the difference of the crimp shapes is ensured, and correspondingly, the quantity and position relation of the guide holes are reasonably set, and the smooth distribution is ensured; the spinneret holes m and the spinneret holes n are distributed according to concentric circles, and the spinneret holes in the same circle are controlled to be m or n, so that a part of PA6/PET parallel composite monofilaments with the mass ratio of PA6 to PET being 3: 2-3: 1 can be mixed into another part of PA6/PET parallel composite monofilaments with the mass ratio of PA6 to PET being 2: 3-1: 3, and the effect of forming a neat left and right spiral shape is achieved; 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 (0.60-0.68 dL/g) of a PET melt and the intrinsic viscosity (2.00-2.20 dL/g) of a PA6 melt, the apparent viscosities of a PET component and a PA6 component extruded from a spinneret orifice are relatively close, the effect of controlling the mass ratio of parallel composite monofilaments is achieved, and the smooth spinning is guaranteed; the shape of the spinneret orifice is not required to be adjusted, and the commonly used parallel composite spinneret orifice is selected; the invention selects the FDY spinning process and reasonably sets the spinning process parameters, so that the prepared fiber has better comprehensive performance.
The principle of the invention is as follows:
the conventional PA6/PET parallel composite fiber adopts a single fixed proportion, and the torsional stress generated by spiral curling is the same, so that the fibers on partial yarn sections generate a regular spiral curling surface morphology structure. Due to the difference of fiber inclination state and mechanical response behavior of each crimped yarn section of the PA6/PET fiber, when the bi-component PA6/PET fiber is used for weaving a fabric, the difference of yarn reflection effect and tension unevenness is caused, protrusions or depressions are randomly formed on the surface of the fabric, and the appearance shows that uneven transverse stripes with randomly changed brightness and darkness, namely the uneven stripe shape, are found.
In the spinning process, the spinning melt continuously flows, and in order to better control the flow of the melt, the formula is calculated according to the melt flow of the melt flowing in the circular tube:
Figure BDA0002334781740000021
wherein, Delta Q is the melt flow, d is the diameter of the round tube, mu is the apparent viscosity of the melt at the inlet of the round tube, l is the length of the round tube, and Delta P is the pressure drop of the melt after passing through the round tube, and as can be seen from the formula, when Delta P, mu and l are kept equal, the ratio of the melt flow flowing in the two round tubes is close to the ratio of the fourth power of the diameter of the round tube;
according to the method, PA6 melt and PET melt are distributed according to an FDY process, and then extruded from a spinneret orifice m and a spinneret orifice n on the same spinneret plate to prepare the parallel self-curling elastic fiber, wherein the distribution refers to that the PA6 melt is distributed into the spinneret orifice m through a distribution orifice A, the PET melt is distributed into the spinneret orifice m through a distribution orifice B, the PA6 melt is distributed into the distribution orifice C, and the PET melt is distributed into the spinneret orifice n through a distribution orifice D;
ratio of PA6 melt flow through distribution hole A (or C) to PET melt flow through distribution hole B (or D)
Figure BDA0002334781740000031
Wherein Δ Q1, D1, μ 1, l1, Δ P1 correspond to dispensing hole a (or C), and Δ Q2, D2, μ 2, l2, Δ P2 correspond to dispensing hole B (or D); due to the matching of the intrinsic viscosity of the PA6 melt, the intrinsic viscosity of the PET melt, the temperature of the spinning beam I, the temperature of the spinning beam II and the temperature of the spinning beam III, the apparent viscosities of the PET melt and the PA6 melt at the inlets of the distribution holes A and B are nearly identical (the difference is less than 5%), and the apparent viscosities of the PET melt and the PA6 melt at the inlets of the distribution holes C and D are nearly identical (the difference is less than 5%), so that mu 1 is approximately equal to mu 2; because the apparent viscosities of the PET melt and the PA6 melt at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are different by no more than 5%, and the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are all arranged on the distribution plate and have small sizes, the pressure drop of the PA6 melt after passing through the distribution hole A is basically the same as that of the PET melt after passing through the distribution hole B, the pressure drop of the PA6 melt after passing through the distribution hole C is basically the same as that of the PET melt after passing through the distribution hole D, and therefore the delta P1 is approximately equal to the delta P2; since dispensing hole a and dispensing hole B are equal in height, dispensing hole C and dispensing hole D are equal in height, l1 is equal to l 2;
through the calculation, the method can know that,
Figure BDA0002334781740000032
and
Figure BDA0002334781740000033
approximately equal, the diameter ratio of the distribution hole A to the distribution hole B is 1.10-1.30: 1, so the ratio of the PA6 melt flow flowing through the distribution hole A to the PET melt flow flowing through the distribution hole B is about 3: 2-3: 1, and the mass ratio of the PA6 to the PET in the monofilaments finally extruded from the spinneret hole m is 3: 2-3: 1, similarly, the distribution hole C and the PET are distributed in a similar mannerThe diameter ratio of the distribution holes D is 1: 1.10-1.30, so that the flow rate ratio of PA6 melt flowing through the distribution holes C to PET melt flowing through the distribution holes D is about 2: 3-1: 3, and the mass ratio of PA6 to PET in monofilaments finally extruded from the spinneret holes n is 2: 3-1: 3;
in addition, the PA6 and the PET adopted in the invention have different thermal shrinkage rates, further, after the PA6 and the PET are mixed, the two polymers with different thermal shrinkage rates have partial compatibility, the compatibility exists, so that the polymers can be bonded together when passing through the same spinneret orifice (namely two fiber-forming polymer melts are distributed together according to a parallel composite spinning mode and then extruded), and the bonding effect and the different thermal shrinkage rates are combined, so that two polymer fibers (namely PA6/PET parallel composite monofilament) coming out of the same spinneret orifice can form a self-curling shape after being subjected to heat treatment, thereby having elasticity, and the self-curling shape is specifically: the PA6 component is on the inside of the spiral crimp and the PET component is on the outside of the spiral crimp;
in the same bundle of fibers, the mass ratio of PA6 to PET in one part of PA6/PET parallel composite monofilaments is 3: 2-3: 1, and the mass ratio of PA6 to PET in the other part of PA6/PET parallel composite monofilaments is 2: 3-1: 3, so that the curling forms of different monofilaments have a certain difference, the difference plays a role in breaking the pure PA6/PET parallel composite filaments from forming a neat left and right spiral form, the curling directions of the monofilaments of the prepared parallel type two-component composite filaments after relaxation heat treatment are randomly distributed, and the surface of a knitted fabric woven by the two-component composite filaments cannot have random strip-shade-shaped unevenness.
As a preferred technical scheme:
according to the preparation method of the polyester-nylon composite yarn, the mass ratio of the PA6 melt to the PET melt is 50: 50.
According to the preparation method of the polyester-nylon composite filament, the spinneret holes m or the spinneret holes n are circular, oval or 8-shaped spinneret holes, the shape of the spinneret holes m or the spinneret holes n is not required to be specially adjusted, and the requirements can be met by selecting the commonly used parallel composite spinneret holes.
According to the preparation method of the polyester-nylon composite filament, all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are m or n, so that the PA6/PET parallel composite filament with the mass ratio of PA6 to PET being 3: 2-3: 1 can be mixed into the middle of the PA6/PET parallel composite filament with the mass ratio of PA6 to PET being 2: 3-1: 3, and the effect of forming a neat left and right spiral shape is achieved.
According to the preparation method of the polyester-nylon composite filament, the spinneret orifice m is composed of the guide hole E, the transition hole and the capillary micro-hole which are connected in sequence, the spinneret orifice n is composed of the guide hole F, the transition hole and the capillary micro-hole which are connected in sequence, the guide hole E is connected with the distribution hole A and the distribution hole B at the same time, and the guide hole F is connected with the distribution hole C and the distribution hole D at the same time; the distribution holes A, B, C and D are located on the distribution plate in the spinning beam III, the PET melt is conveyed to the distribution holes B and D through the spinning beam I, and the PA6 melt is conveyed to the distribution holes A and C through the spinning beam II.
According to the preparation method of the polyester-nylon composite yarn, the intrinsic viscosity of a PET melt is 0.60-0.68 dL/g, the temperature of a spinning manifold I is 280-285 ℃, the intrinsic viscosity of a PA6 melt is 2.00-2.20 dL/g, the temperature of a spinning manifold II is 265-270 ℃, and the temperature of a spinning manifold III (the temperature of the spinning manifold III is the spinning temperature) is 278-282 ℃.
According to the preparation method of the polyester-nylon composite filament, the parameters of the FDY process are as follows: the cooling temperature is 23-25 ℃, the network pressure is 0.20-0.30 MPa, the speed of one roller is 1500-1650 m/min, the temperature of one roller is 80-90 ℃, the speed of two rollers is 2600-2800 m/min, the temperature of two rollers is 140-150 ℃, and the winding speed is 2550-2730 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 polyester-nylon composite yarn, the PA6 melt and the PET melt respectively contain 5wt% of PET-PA6 copolymer melt, and because good compatibility between two components is a necessary condition for forming parallel composite fibers, and the compatibility between PA6 and PET is not too good, the compatibility between PA6 and PET can be improved by respectively mixing partial PET-PA6 copolymer melts in the PA6 melt and the PET melt; the preparation process of the PET-PA6 copolymer comprises the following steps: mixing PET with a number average molecular weight of 2000-3000 and PA6 with a number average molecular weight of 2000-3000 according to a mass ratio of 1:1, and performing polycondensation reaction for 40-60 min under the conditions that the temperature is 273-277 ℃ and the vacuum degree is lower than 50 Pa.
The invention also provides the polyester-nylon composite filament prepared by the preparation method of the polyester-nylon composite filament, which consists of a plurality of PA6/PET parallel composite monofilaments in two proportions, wherein in the same fiber bundle, the mass ratio of PA6 to PET in one part of PA6/PET parallel composite monofilaments is 3: 2-3: 1, and the mass ratio of PA6 to PET in the other part of PA6/PET parallel composite monofilaments is 2: 3-1: 3; the single silk curling directions in the polyester-nylon composite silk are randomly distributed.
As a preferred technical scheme:
the polyester-nylon composite wire has the advantages that the crimp shrinkage rate of the polyester-nylon composite wire is 48-52%, the crimp stability is 76-80%, the shrinkage elongation is 85-88%, and the crimp elastic recovery rate is 90-93%; the breaking strength of the polyester-nylon composite yarn is more than or equal to 2.5cN/dtex, the elongation at break is 55.0 +/-5.0%, and the total titer is 50-100 dtex.
The prepared polyester-nylon composite yarn is made into a knitted fabric for testing the uneven condition of the stripe shade, and the testing process comprises the following steps: firstly, acquiring the knitted fabric image and converting the knitted fabric image into a gray image, then carrying out first processing and second processing on the gray image and then calculating a parameter D, and representing the uneven degree of the strip shade shape by using the parameter D, wherein the gray image comprises a strip shade area, a high gray value area of a non-strip shade area and a low gray value area of the non-strip shade 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 polyester-nylon composite yarn is as follows: the D value of the knitted fabric made of the polyester-nylon composite yarn is less than or equal to 1.0 percent; the polyester-nylon composite yarn prepared by the invention does not have the problem of uneven stripe shade.
Has the advantages that:
(1) according to the preparation method of the polyester-nylon composite filament, distribution holes with different diameters are adopted, so that the obtained PA6/PET parallel composite filament contains different component ratios, the generation of a regular and spiral curled surface morphological structure of the filament is avoided, and strip shade unevenness is avoided;
(2) the polyester-nylon composite yarn prepared by the preparation method of the polyester-nylon composite yarn has the advantages of good crimpling performance, good elasticity, excellent comprehensive performance and wide application range.
Drawings
FIG. 1 is a schematic view of the melt distribution of the present invention; a, B, C, D are independent distribution holes, E, F 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 load the load of 0.09cN/dtex instead,measuring the position of the mark point for 30s, namely the length l of the sample when the sample is heavily loaded2(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
A preparation method of polyester-polyamide composite filaments comprises the steps of distributing a PET melt (with the intrinsic viscosity of 0.6dL/g) and a PA6 melt (with the intrinsic viscosity of 2.2dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PA6 melt from a spinneret orifice m (round) and a spinneret orifice n (round) on the same spinneret plate to prepare FDY filaments, and performing relaxation heat treatment to obtain the polyester-polyamide composite filaments;
the PA6 melt and the PET melt each contained 5wt% of a PET-PA6 copolymer melt; the preparation process of the PET-PA6 copolymer comprises the following steps: mixing PET with number average molecular weight of 2000 and PA6 with number average molecular weight of 2000 at a mass ratio of 1:1, and performing polycondensation reaction at 273 deg.C and vacuum degree of 45Pa for 60 min;
the distribution refers to that PA6 melt is distributed into a distribution hole A, and PET melt is distributed into a spinneret hole m through a distribution hole B; the PA6 melt is distributed into the distribution holes C, and the PET melt is distributed into the spinneret holes n through the distribution holes D; the apparent viscosities of the PET melt and PA6 melt at the inlets of dispense orifice a, dispense orifice B, dispense orifice C, and dispense orifice D differ by 5%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.10:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.10;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all 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 F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole a and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are positioned on a distribution plate in the spinning beam III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning beam I, and the PA6 melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam II;
the temperature of the spinning manifold I is 285 ℃, the temperature of the spinning manifold II is 270 ℃, and the temperature of the spinning manifold III is 282 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 25 ℃, the network pressure is 0.2MPa, the one-roller speed is 1600m/min, the one-roller temperature is 80 ℃, the two-roller speed is 2760m/min, the two-roller temperature is 140 ℃, and the winding speed is 2710 m/min; the temperature of the relaxation heat treatment was 104 ℃ for 30 min.
The finally prepared nylon composite filament consists of a plurality of PA6/PET parallel composite monofilaments; randomly distributing the single silk curling direction in the polyester-nylon composite silk; the polyester-nylon composite filament has the crimp shrinkage rate of 52 percent, the crimp stability of 80 percent, the shrinkage elongation of 88 percent and the crimp elastic recovery rate of 93 percent; the breaking strength of the polyester-nylon composite yarn is more than or equal to 2.5cN/dtex, the elongation at break is 50.5%, and the total titer is 100 dtex.
The prepared polyester-nylon composite yarn is prepared into a knitted fabric for strip shade unevenness condition test, and the test results are as follows: the D value of the knitted fabric made of the polyester-nylon composite yarn is 0.57 percent; the polyester-nylon composite yarn prepared by the invention does not have the problem of uneven stripe shade.
Example 2
A preparation method of polyester-polyamide composite filaments comprises the steps of distributing PET melt (the intrinsic viscosity is 0.66dL/g) and PA6 melt (the intrinsic viscosity is 2.13dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PA6 melt from a spinneret orifice m (oval) and a spinneret orifice n (round) on the same spinneret plate to prepare FDY filaments, and performing relaxation heat treatment to obtain the polyester-polyamide composite filaments;
the PA6 melt and the PET melt each contained 5wt% of a PET-PA6 copolymer melt; the preparation process of the PET-PA6 copolymer comprises the following steps: mixing PET with number average molecular weight of 2280 and PA6 with number average molecular weight of 2220 at a mass ratio of 1:1, and performing polycondensation reaction at 275 deg.C and vacuum degree of 47Pa for 55 min;
the distribution refers to that PA6 melt is distributed into a distribution hole A, and PET melt is distributed into a spinneret hole m through a distribution hole B; the PA6 melt is distributed into the distribution holes C, and the PET melt is distributed into the spinneret holes n through the distribution holes D; the apparent viscosities of the PET melt and PA6 melt at the inlets of dispense orifice a, dispense orifice B, dispense orifice C, and dispense orifice D differ by 3.6%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.10:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.10;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all 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 F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are positioned on a distribution plate in the spinning beam III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning beam I, and the PA6 melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam II;
the temperature of the spinning manifold I is 285 ℃, the temperature of the spinning manifold II is 267 ℃, and the temperature of the spinning manifold III is 278 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 23 ℃, the network pressure is 0.25MPa, the one-roller speed is 1650m/min, the one-roller temperature is 90 ℃, the two-roller speed is 2660m/min, the two-roller temperature is 150 ℃, and the winding speed is 2550 m/min; the temperature of the relaxation heat treatment was 103 ℃ and the time was 28 min.
The finally prepared nylon composite filament consists of a plurality of PA6/PET parallel composite monofilaments; randomly distributing the single silk curling direction in the polyester-nylon composite silk; the polyester-nylon composite filament has the crimp shrinkage rate of 50.8 percent, the crimp stability of 78 percent, the shrinkage elongation of 86 percent and the crimp elastic recovery rate of 90.4 percent; the breaking strength of the polyester-nylon composite yarn is more than or equal to 2.5cN/dtex, the elongation at break is 52.5%, and the total titer is 55 dtex.
The prepared polyester-nylon composite yarn is prepared into a knitted fabric for strip shade unevenness condition test, and the test results are as follows: the D value of the knitted fabric made of the polyester-nylon composite yarn is 0.65 percent; the polyester-nylon composite yarn prepared by the invention does not have the problem of uneven stripe shade.
Example 3
A preparation method of polyester-polyamide composite filament comprises the steps of distributing PET melt (the intrinsic viscosity is 0.68dL/g) and PA6 melt (the intrinsic viscosity is 2.17dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PA6 melt from a spinneret orifice m (8-shaped) and a spinneret orifice n (circular) on the same spinneret plate to prepare FDY filament, and performing relaxation heat treatment to obtain the polyester-polyamide composite filament;
the PA6 melt and the PET melt each contained 5wt% of a PET-PA6 copolymer melt; the preparation process of the PET-PA6 copolymer comprises the following steps: mixing PET with number average molecular weight of 2390 and PA6 with number average molecular weight of 2350 at a mass ratio of 1:1, and performing polycondensation reaction at 275 deg.C under vacuum degree of 48Pa for 55 min;
the distribution refers to that PA6 melt is distributed into a distribution hole A, and PET melt is distributed into a spinneret hole m through a distribution hole B; the PA6 melt is distributed into the distribution holes C, and the PET melt is distributed into the spinneret holes n through the distribution holes D; the apparent viscosities of the PET melt and PA6 melt at the inlets of dispense orifice a, dispense orifice B, dispense orifice C, and dispense orifice D differ by 3.2%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.10:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.10;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all 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 F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are positioned on a distribution plate in the spinning beam III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning beam I, and the PA6 melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam II;
the temperature of the spinning manifold I is 281 ℃, the temperature of the spinning manifold II is 268 ℃, and the temperature of the spinning manifold III is 278 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 23 ℃, the network pressure is 0.23MPa, the one-roller speed is 1600m/min, the one-roller temperature is 86 ℃, the two-roller speed is 2600m/min, the two-roller temperature is 142 ℃, and the winding speed is 2570 m/min; the temperature of the relaxation heat treatment is 120 deg.C, and the time is 29 min.
The finally prepared nylon composite filament consists of a plurality of PA6/PET parallel composite monofilaments; randomly distributing the single silk curling direction in the polyester-nylon composite silk; the polyester-nylon composite filament has the crimp shrinkage of 50%, the crimp stability of 79.5%, the shrinkage elongation of 86.7% and the crimp elastic recovery of 92.7%; the breaking strength of the polyester-nylon composite yarn is more than or equal to 2.5cN/dtex, the elongation at break is 54.5%, and the total titer is 85 dtex.
The prepared polyester-nylon composite yarn is prepared into a knitted fabric for strip shade unevenness condition test, and the test results are as follows: the D value of the knitted fabric made of the polyester-nylon composite yarn is 0.63 percent; the polyester-nylon composite yarn prepared by the invention does not have the problem of uneven stripe shade.
Example 4
A preparation method of polyester-polyamide composite filament comprises the steps of distributing PET melt (the intrinsic viscosity is 0.63dL/g) and PA6 melt (the intrinsic viscosity is 2.0dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PA6 melt from a spinneret orifice m (oval) and a spinneret orifice n (8 shape) on the same spinneret plate to prepare FDY filament, and performing relaxation heat treatment to obtain the polyester-polyamide composite filament;
the PA6 melt and the PET melt each contained 5wt% of a PET-PA6 copolymer melt; the preparation process of the PET-PA6 copolymer comprises the following steps: mixing PET with number average molecular weight of 2500 and PA6 with number average molecular weight of 2500 at a mass ratio of 1:1, and performing polycondensation reaction at 275 deg.C and vacuum degree of 45Pa for 55 min;
the distribution refers to that PA6 melt is distributed into a distribution hole A, and PET melt is distributed into a spinneret hole m through a distribution hole B; the PA6 melt is distributed into the distribution holes C, and the PET melt is distributed into the spinneret holes n through the distribution holes D; the apparent viscosities of the PET melt and PA6 melt at the inlets of dispense orifice a, dispense orifice B, dispense orifice C, and dispense orifice D differ by 2.8%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.18:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.18;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all 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 F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are positioned on a distribution plate in the spinning beam III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning beam I, and the PA6 melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam II;
the temperature of the spinning manifold I is 283 ℃, the temperature of the spinning manifold II is 265 ℃ and the temperature of the spinning manifold III is 282 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 23 ℃, the network pressure is 0.24MPa, the one-roller speed is 1550m/min, the one-roller temperature is 80 ℃, the two-roller speed is 2800m/min, the two-roller temperature is 144 ℃, and the winding speed is 2670 m/min; the temperature of the relaxation heat treatment is 90 deg.C, and the time is 24 min.
The finally prepared nylon composite filament consists of a plurality of PA6/PET parallel composite monofilaments; randomly distributing the single silk curling direction in the polyester-nylon composite silk; the polyester-nylon composite filament has the crimp shrinkage rate of 51.5 percent, the crimp stability of 77.3 percent, the shrinkage elongation of 87.9 percent and the crimp elastic recovery rate of 92.8 percent; the breaking strength of the polyester-nylon composite yarn is more than or equal to 2.5cN/dtex, the elongation at break is 57%, and the total titer is 95 dtex.
The prepared polyester-nylon composite yarn is prepared into a knitted fabric for strip shade unevenness condition test, and the test results are as follows: the D value of the knitted fabric made of the polyester-nylon composite yarn is 0.24 percent; the polyester-nylon composite yarn prepared by the invention does not have the problem of uneven stripe shade.
Example 5
A preparation method of polyester-polyamide composite filaments comprises the steps of distributing PET melt (the intrinsic viscosity is 0.61dL/g) and PA6 melt (the intrinsic viscosity is 2.13dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PA6 melt from a spinneret orifice m (round) and a spinneret orifice n (round) on the same spinneret plate to prepare FDY filaments, and performing relaxation heat treatment to obtain the polyester-polyamide composite filaments;
the PA6 melt and the PET melt each contained 5wt% of a PET-PA6 copolymer melt; the preparation process of the PET-PA6 copolymer comprises the following steps: mixing PET with number average molecular weight of 3000 and PA6 with number average molecular weight of 2800 at a mass ratio of 1:1, and performing polycondensation reaction at 276 deg.C under vacuum degree of 45Pa for 48 min;
the distribution refers to that PA6 melt is distributed into a distribution hole A, and PET melt is distributed into a spinneret hole m through a distribution hole B; the PA6 melt is distributed into the distribution holes C, and the PET melt is distributed into the spinneret holes n through the distribution holes D; the apparent viscosities of the PET melt and PA6 melt at the inlets of dispense orifice a, dispense orifice B, dispense orifice C, and dispense orifice D differ by 1.5%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.25:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.25;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all 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 F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are positioned on a distribution plate in the spinning beam III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning beam I, and the PA6 melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam II;
the temperature of the spinning manifold I is 285 ℃, the temperature of the spinning manifold II is 268 ℃, and the temperature of the spinning manifold III is 281 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 24 ℃, the network pressure is 0.28MPa, the first roller speed is 1565m/min, the first roller temperature is 87 ℃, the second roller speed is 2880m/min, the second roller temperature is 140 ℃, and the winding speed is 2660 m/min; the temperature of the relaxation heat treatment was 105 ℃ for 25 min.
The finally prepared nylon composite filament consists of a plurality of PA6/PET parallel composite monofilaments; randomly distributing the single silk curling direction in the polyester-nylon composite silk; the polyester-nylon composite filament has the crimp shrinkage rate of 50.6 percent, the crimp stability of 76 percent, the shrinkage elongation of 85.8 percent and the crimp elastic recovery rate of 92.8 percent; the breaking strength of the polyester-nylon composite yarn is more than or equal to 2.5cN/dtex, the elongation at break is 50 percent, and the total titer is 70 dtex.
The prepared polyester-nylon composite yarn is prepared into a knitted fabric for strip shade unevenness condition test, and the test results are as follows: the D value of the knitted fabric made of the polyester-nylon composite yarn is 0.32 percent; the polyester-nylon composite yarn prepared by the invention does not have the problem of uneven stripe shade.
Example 6
A preparation method of polyester-polyamide composite filaments comprises the steps of distributing PET melt (the intrinsic viscosity is 0.64dL/g) and PA6 melt (the intrinsic viscosity is 2.12dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PA6 melt from a spinneret orifice m (oval) and a spinneret orifice n (round) on the same spinneret plate to prepare FDY filaments, and performing relaxation heat treatment to obtain the polyester-polyamide composite filaments;
the PA6 melt and the PET melt each contained 5wt% of a PET-PA6 copolymer melt; the preparation process of the PET-PA6 copolymer comprises the following steps: mixing PET with number average molecular weight of 2400 and PA6 with number average molecular weight of 2400 according to a mass ratio of 1:1, and performing polycondensation reaction for 50min at the temperature of 274 ℃ and the vacuum degree of 45 Pa;
the distribution refers to that PA6 melt is distributed into a distribution hole A, and PET melt is distributed into a spinneret hole m through a distribution hole B; the PA6 melt is distributed into the distribution holes C, and the PET melt is distributed into the spinneret holes n through the distribution holes D; the apparent viscosities of the PET melt and PA6 melt at the inlets of dispense orifice a, dispense orifice B, dispense orifice C, and dispense orifice D differ by 2%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.28:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.28;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all 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 F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are positioned on a distribution plate in the spinning beam III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning beam I, and the PA6 melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam II;
the temperature of the spinning manifold I is 282 ℃, the temperature of the spinning manifold II is 265 ℃ and the temperature of the spinning manifold III is 282 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 25 ℃, the network pressure is 0.3MPa, the one-roll speed is 1500m/min, the one-roll temperature is 85 ℃, the two-roll speed is 2780m/min, the two-roll temperature is 140 ℃, and the winding speed is 2730 m/min; the temperature of the relaxation heat treatment is 104 ℃ and the time is 20 min.
The finally prepared nylon composite filament consists of a plurality of PA6/PET parallel composite monofilaments; randomly distributing the single silk curling direction in the polyester-nylon composite silk; the polyester-nylon composite filament has the crimp shrinkage rate of 48 percent, the crimp stability of 78.7 percent, the shrinkage elongation of 85 percent and the crimp elastic recovery rate of 90 percent; the breaking strength of the polyester-nylon composite yarn is more than or equal to 2.5cN/dtex, the elongation at break is 53.6 percent, and the total titer is 87 dtex.
The prepared polyester-nylon composite yarn is prepared into a knitted fabric for strip shade unevenness condition test, and the test results are as follows: the D value of the knitted fabric made of the polyester-nylon composite yarn is 0.64 percent; the polyester-nylon composite yarn prepared by the invention does not have the problem of uneven stripe shade.
Example 7
A preparation method of polyester-polyamide composite filaments comprises the steps of distributing a PET melt (with the intrinsic viscosity of 0.6dL/g) and a PA6 melt (with the intrinsic viscosity of 2.08dL/g) in a mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PA6 melt from a spinneret orifice m (oval) and a spinneret orifice n (oval) on the same spinneret plate to prepare FDY filaments, and performing relaxation heat treatment to obtain the polyester-polyamide composite filaments;
the PA6 melt and the PET melt each contained 5wt% of a PET-PA6 copolymer melt; the preparation process of the PET-PA6 copolymer comprises the following steps: mixing PET with number average molecular weight of 2000 and PA6 with number average molecular weight of 2000 at a mass ratio of 1:1, and performing polycondensation reaction for 58min at 273 ℃ and a vacuum degree of 48 Pa;
the distribution refers to that PA6 melt is distributed into a distribution hole A, and PET melt is distributed into a spinneret hole m through a distribution hole B; the PA6 melt is distributed into the distribution holes C, and the PET melt is distributed into the spinneret holes n through the distribution holes D; the apparent viscosities of the PET melt and PA6 melt at the inlets of dispense orifice a, dispense orifice B, dispense orifice C, and dispense orifice D differ by 4.2%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.30:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.30;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all 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 F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are positioned on a distribution plate in the spinning beam III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning beam I, and the PA6 melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam II;
the temperature of the spinning beam I is 279 ℃, the temperature of the spinning beam II is 265 ℃ and the temperature of the spinning beam III is 279 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 24 ℃, the network pressure is 0.22MPa, the one-roller speed is 1650m/min, the one-roller temperature is 88 ℃, the two-roller speed is 2650m/min, the two-roller temperature is 143 ℃, and the winding speed is 2580 m/min; the temperature of the relaxation heat treatment was 114 ℃ for 23 min.
The finally prepared nylon composite filament consists of a plurality of PA6/PET parallel composite monofilaments; randomly distributing the single silk curling direction in the polyester-nylon composite silk; the polyester-nylon composite filament has the crimp shrinkage rate of 50.2 percent, the crimp stability of 78 percent, the shrinkage elongation of 86.5 percent and the crimp elastic recovery rate of 91.3 percent; the breaking strength of the polyester-nylon composite yarn is more than or equal to 2.5cN/dtex, the elongation at break is 60 percent, and the total titer is 66 dtex.
The prepared polyester-nylon composite yarn is prepared into a knitted fabric for strip shade unevenness condition test, and the test results are as follows: the D value of the knitted fabric made of the polyester-nylon composite yarn is 0.56 percent; the polyester-nylon composite yarn prepared by the invention does not have the problem of uneven stripe shade.
Example 8
A preparation method of polyester-polyamide composite filament comprises the steps of distributing PET melt (the intrinsic viscosity is 0.63dL/g) and PA6 melt (the intrinsic viscosity is 2.13dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PA6 melt from a spinneret orifice m (8-shaped) and a spinneret orifice n (8-shaped) on the same spinneret plate to prepare FDY filament, and performing relaxation heat treatment to obtain the polyester-polyamide composite filament;
the PA6 melt and the PET melt each contained 5wt% of a PET-PA6 copolymer melt; the preparation process of the PET-PA6 copolymer comprises the following steps: mixing PET with number average molecular weight of 3000 and PA6 with number average molecular weight of 3000 according to mass ratio of 1:1, and performing polycondensation reaction for 40min at 277 ℃ and vacuum degree of 48 Pa;
the distribution refers to that PA6 melt is distributed into a distribution hole A, and PET melt is distributed into a spinneret hole m through a distribution hole B; the PA6 melt is distributed into the distribution holes C, and the PET melt is distributed into the spinneret holes n through the distribution holes D; the apparent viscosities of the PET melt and PA6 melt at the inlets of dispense orifice a, dispense orifice B, dispense orifice C, and dispense orifice D differ by 1.2%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.30:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.30;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all 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 F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are positioned on a distribution plate in the spinning beam III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning beam I, and the PA6 melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam II;
the temperature of the spinning manifold I is 284 ℃, the temperature of the spinning manifold II is 269 ℃, and the temperature of the spinning manifold III is 278 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 23 ℃, the network pressure is 0.27MPa, the first roller speed is 1590m/min, the first roller temperature is 89 ℃, the second roller speed is 2700m/min, the second roller temperature is 146 ℃, and the winding speed is 2560 m/min; the temperature of the relaxation heat treatment was 101 ℃ and the time was 29 min.
The finally prepared nylon composite filament consists of a plurality of PA6/PET parallel composite monofilaments; randomly distributing the single silk curling direction in the polyester-nylon composite silk; the polyester-nylon composite filament has the crimp shrinkage rate of 49.7 percent, the crimp stability of 76.8 percent, the shrinkage elongation of 86 percent and the crimp elastic recovery rate of 92.1 percent; the breaking strength of the polyester-nylon composite yarn is more than or equal to 2.5cN/dtex, the elongation at break is 53.8 percent, and the total titer is 50 dtex.
The prepared polyester-nylon composite yarn is prepared into a knitted fabric for strip shade unevenness condition test, and the test results are as follows: the D value of the knitted fabric made of the polyester-nylon composite yarn is 0.48 percent; the polyester-nylon composite yarn prepared by the invention does not have the problem of uneven stripe shade.

Claims (9)

1. A preparation method of polyester-nylon composite yarn is characterized by comprising the following steps: according to the FDY process, after PET melt and PA6 melt are distributed, FDY filaments are extruded from a spinneret orifice m and a spinneret orifice n on the same spinneret plate and are subjected to relaxation heat treatment, and then the polyester-nylon composite filaments are obtained;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all n;
the PA6 melt and the PET melt each contained 5wt% of a PET-PA6 copolymer melt;
the distribution refers to that PA6 melt is distributed into a distribution hole A, and PET melt is distributed into a spinneret hole m through a distribution hole B; the PA6 melt is distributed into the distribution holes C, and the PET melt is distributed into the spinneret holes n through the distribution holes D;
the apparent viscosities of the PET melt and PA6 melt at the inlets of dispense orifice A, dispense orifice B, dispense orifice C and dispense orifice D differ by no more than 5%;
the distribution hole A and the distribution hole B are equal-height cylindrical holes, the diameter ratio of the distribution hole A to the distribution hole B is 1.10-1.30: 1, the distribution hole C and the distribution hole D are equal-height cylindrical holes, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.10-1.30.
2. The preparation method of the polyester-nylon composite yarn as claimed in claim 1, wherein the mass ratio of the PA6 melt to the PET melt is 50: 50.
3. The method for preparing polyester-nylon composite yarns according to claim 1, wherein the spinneret holes m or n are circular, oval or 8-shaped spinneret holes.
4. The preparation method of the polyester-nylon composite yarn according to claim 1, wherein the spinneret hole m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret hole n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution holes A, B, C and D are located on the distribution plate in the spinning beam III, the PET melt is conveyed to the distribution holes B and D through the spinning beam I, and the PA6 melt is conveyed to the distribution holes A and C through the spinning beam II.
5. The preparation method of the polyester-nylon composite yarn as claimed in claim 4, wherein the intrinsic viscosity of the PET melt is 0.60-0.68 dL/g, the temperature of the spinning beam I is 280-285 ℃, the intrinsic viscosity of the PA6 melt is 2.00-2.20 dL/g, the temperature of the spinning beam II is 265-270 ℃, and the temperature of the spinning beam III is 278-282 ℃.
6. The preparation method of polyester-nylon composite yarn according to claim 5, wherein the parameters of the FDY process are as follows: the cooling temperature is 23-25 ℃, the network pressure is 0.20-0.30 MPa, the speed of one roller is 1500-1650 m/min, the temperature of one roller is 80-90 ℃, the speed of two rollers is 2600-2800 m/min, the temperature of two rollers is 140-150 ℃, and the winding speed is 2550-2730 m/min; the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
7. The preparation method of polyester-nylon composite yarn according to claim 1, wherein the preparation process of the PET-PA6 copolymer is as follows: mixing PET with a number average molecular weight of 2000-3000 and PA6 with a number average molecular weight of 2000-3000 according to a mass ratio of 1:1, and performing polycondensation reaction for 40-60 min under the conditions that the temperature is 273-277 ℃ and the vacuum degree is lower than 50 Pa.
8. The polyester-nylon composite yarn prepared by the preparation method of the polyester-nylon composite yarn as claimed in any one of claims 1 to 7 is characterized in that: the composite fiber bundle comprises a plurality of PA6/PET parallel composite monofilaments, wherein in the same fiber bundle, the mass ratio of PA6 to PET in one part of PA6/PET parallel composite monofilaments is 3: 2-3: 1, and the mass ratio of PA6 to PET in the other part of PA6/PET parallel composite monofilaments is 2: 3-1: 3; the single silk curling directions in the polyester-nylon composite silk are randomly distributed.
9. The polyester-nylon composite yarn as claimed in claim 8, wherein the polyester-nylon composite yarn has a crimp shrinkage of 48-52%, a crimp stability of 76-80%, a shrinkage elongation of 85-88%, and a crimp elastic recovery of 90-93%; the breaking strength of the polyester-nylon composite yarn is more than or equal to 2.5cN/dtex, the elongation at break is 55.0 +/-5.0%, and the total titer is 50-100 dtex.
CN201911351550.7A 2019-12-24 2019-12-24 Polyester-nylon composite yarn and preparation method thereof Active CN111118665B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911351550.7A CN111118665B (en) 2019-12-24 2019-12-24 Polyester-nylon composite yarn and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911351550.7A CN111118665B (en) 2019-12-24 2019-12-24 Polyester-nylon composite yarn and preparation method thereof

Publications (2)

Publication Number Publication Date
CN111118665A CN111118665A (en) 2020-05-08
CN111118665B true CN111118665B (en) 2022-03-18

Family

ID=70502182

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911351550.7A Active CN111118665B (en) 2019-12-24 2019-12-24 Polyester-nylon composite yarn and preparation method thereof

Country Status (1)

Country Link
CN (1) CN111118665B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112760749A (en) * 2020-12-29 2021-05-07 嘉兴市凯邦锦纶科技股份有限公司 Manufacturing method of parallel superfine denier modified polyester fancy spun yarn

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1130996A (en) * 1966-03-19 1968-10-16 Kanegafuchi Boseki Kabushki Ka A method of manufacturing stretchable knitted goods
CN1737224A (en) * 2004-08-17 2006-02-22 株式会社化纤喷丝板制作所 Spinning spinneret and method for producing side-by-side-type conjugated fibre

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1130996A (en) * 1966-03-19 1968-10-16 Kanegafuchi Boseki Kabushki Ka A method of manufacturing stretchable knitted goods
CN1737224A (en) * 2004-08-17 2006-02-22 株式会社化纤喷丝板制作所 Spinning spinneret and method for producing side-by-side-type conjugated fibre

Also Published As

Publication number Publication date
CN111118665A (en) 2020-05-08

Similar Documents

Publication Publication Date Title
CN1408033A (en) Bicomponent effect yarns and fabrics thereof
CN105452548A (en) Process for the preparation of a fiber, a fiber and a yarn made from such a fiber
CN111118617B (en) Full-dull elastic yarn and preparation method thereof
CN111118628B (en) PBT/PET double-component elastic yarn and preparation method thereof
CN111118665B (en) Polyester-nylon composite yarn and preparation method thereof
CN110983465B (en) Method for preparing self-curling elastic combined filament yarn for knitting
CN111101238B (en) Parallel self-crimping elastic fiber and preparation method thereof
CN111041578B (en) PET (polyethylene terephthalate) double-component elastic yarn with different viscosities and preparation method thereof
CN114144549B (en) Core-sheath type composite false-twist yarn and preparation method thereof
CN111101210B (en) Natural crimped fiber and preparation method thereof
CN111101235B (en) CDP/PET double-component composite filament by one-step method and preparation method thereof
CN111101237B (en) High-low viscosity PET parallel composite self-crimping fiber and preparation method thereof
CN110983466B (en) PTT/PET double-component elastic yarn and preparation method thereof
CN111118663B (en) PBT/PTT double-component elastic yarn and preparation method thereof
CN111058108B (en) Self-curling elastic combined filament yarn for knitting and preparation method thereof
CN111041577B (en) PET/modified PET double-component elastic yarn and preparation method thereof
CN111118664B (en) Parallel self-curling wool-like elastic fiber and preparation method thereof
CN111118630B (en) Soft polyester fiber and preparation method thereof
KR102100565B1 (en) Core-sheath type composite false-twist yarn and manufacturing method thereof
CN111101236B (en) Self-curling elastic combined filament yarn for knitted denim and preparation method thereof
CN111005083A (en) Parallel self-crimping POY-DT silk elastic fiber and preparation method thereof
CN111101264A (en) Shrink-proof non-ironing wool-like fabric and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant