CN110983466B - PTT/PET double-component elastic yarn and preparation method thereof - Google Patents
PTT/PET double-component elastic yarn and preparation method thereof Download PDFInfo
- Publication number
- CN110983466B CN110983466B CN201911351546.0A CN201911351546A CN110983466B CN 110983466 B CN110983466 B CN 110983466B CN 201911351546 A CN201911351546 A CN 201911351546A CN 110983466 B CN110983466 B CN 110983466B
- Authority
- CN
- China
- Prior art keywords
- ptt
- pet
- distribution hole
- hole
- distribution
- 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
Links
Images
Classifications
-
- 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
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
- D02G1/20—Combinations of two or more of the above-mentioned operations or devices; After-treatments for fixing crimp or curl
-
- 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
Abstract
The invention relates to a PTT/PET double-component elastic filament and a preparation method thereof, wherein PET and a PTT melt are distributed according to an FDY process, and are extruded from spinneret orifices m and n on the same spinneret plate to form an FDY filament, and then the FDY filament is subjected to relaxation heat treatment to obtain the PTT/PET double-component elastic filament, wherein the PTT and the PET melt flow to the spinneret orifices m through a distribution hole A, B and flow to the spinneret orifices n through a distribution hole C, D, the difference between the apparent viscosities of the PET melt and the PTT melt at the inlet of a distribution hole A, B, C, D is not more than 5%, the distribution hole A, B is a cylindrical hole with the same height, the diameter ratio of the cylindrical hole is 1.24:1, the distribution hole C, D is a cylindrical hole with the same height, and the diameter ratio of the cylindrical hole is 1: 1.24; the prepared double-component elastic yarn is composed of a plurality of PTT/PET parallel composite monofilaments with different proportions, and the monofilaments in the double-component elastic yarn are randomly distributed in the curling direction. The knitted fabric of the PTT/PET double-component elastic yarn has the problem of uneven stripe shade which does not exist.
Description
Technical Field
The invention belongs to the technical field of polyester fibers, and relates to a PTT/PET double-component elastic yarn and a preparation method thereof.
Background
Generally, chemical fibers have smooth surfaces, no crimp, small gaps between fibers, and poor bulkiness and fullness of products, and some crimp is usually formed by physical or chemical methods, but such crimp is not durable and has a low degree of crimp. The composite fiber is different from a common single-component chemical fiber, two components with different properties such as shrinkage rule, modulus and the like exist in the section of the composite fiber, the fiber is curled due to the difference of stress-strain behaviors of two polymers distributed on two sides, the curling is not generated by utilizing the heat setting property, and the curling is the self characteristic of the composite fiber and is called self-curling.
The PTT/PET composite fiber has two components coexisting on the cross section, presents three-dimensional spiral crimp in spatial form, combines the optimal performances of the PTT and PET fibers in performance, has excellent rebound resilience and dyeing performance, can realize continuous dyeing of carrier-free boiling water under normal pressure, and has a plurality of potential uses. The elastic fabric with elastic elongation rate equivalent to spandex can be prepared by taking the PTT/PET parallel composite filaments as weft yarns and interweaving the PTT/PET parallel composite filaments with cotton type, wool type and other warp yarns or chemical fiber filament warp yarns, and the performances of the elastic fabric, such as elastic durability, finished product rate, size stability and the like, of the elastic fabric are far superior to those of spandex fabric. And because the PTT and PET two polymers have the characteristics of chlorine bleaching resistance, no moisture absorption and the like, the PTT/PET composite fiber can be used for manufacturing high-grade swimwear, gymnastics clothes, body beautification clothes and the like.
The PTT/PET fiber three-dimensional spiral curls and straightens under the stretching action of external force, and can well return to the original curling shape when the external force action is removed, so that the PTT/PET fabric has small residual deformation during multiple stretching, good elastic resilience, can adapt to the shape of a human body, is easy to wash and wash, can be washed, resists wrinkles and keeps folds, has excellent shape-keeping effect, meets the requirements of pursuing body type and comfort in fashion of modern people, and is one of the reasons in the fields of wide-range sports and outerwear of the fiber. The woven fabric has smoother hand feeling than the polyester textured yarn and shows excellent performances in the aspects of dyeing, sizing and tearing strength.
However, when the FDY yarn of PTT/PET fiber is applied to the knitting field, very troublesome problems occur: the woven knitted fabric has random uneven stripe shade on the surface, and is particularly obvious on plain knitted fabrics, so that a plurality of knitted products cannot be popularized and applied, therefore, the PTT/PET fiber knitted fabric is evaluated to be a low-grade product with uneven stripe shade, and the problem becomes a great obstacle for restricting the development and application of the PTT/PET fiber knitted fabric.
Therefore, the research on the PTT/PET side-by-side bicomponent fiber for avoiding the random strip shade unevenness and the preparation method thereof have very important significance.
Disclosure of Invention
The invention provides a PTT/PET double-component elastic yarn and a preparation method thereof, aiming at solving the problem of random uneven stripe shade when PTT/PET parallel composite fibers are applied to knitted fabric products in the prior art. The invention adopts a mode that the PTT/PET parallel composite monofilament with the mass ratio of PTT to PET being 7:3 and the PTT/PET parallel composite monofilament with the mass ratio of PTT to PET being 3:7 coexist in one bundle of filament, and because the two PTT/PET parallel composite fibers with different mass ratios of PTT to PET have different shrinkage modes and forms, the invention breaks through the formation of regular left and right spiral forms of one bundle of PTT/PET parallel composite fibers, and further solves the problem of uneven strip shade of a knitted fabric made of the PTT/PET parallel composite fibers.
In order to achieve the purpose, the invention adopts the following scheme:
a preparation method of PTT/PET double-component elastic yarn is that according to FDY technology, after PET melt and PTT melt are distributed, PTT/PET double-component elastic yarn is made by extruding from a spinneret orifice m and a spinneret orifice n on the same spinneret plate;
the distribution refers to that the PTT melt is distributed into a spinneret orifice m through a distribution orifice A, the PET melt is distributed into a spinneret orifice m through a distribution orifice B, the PTT melt is distributed into a spinneret orifice n through a distribution orifice C, and the PET melt is distributed into a spinneret orifice n through a distribution orifice D;
at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PTT melt are different by no more than 5% (the apparent viscosities are determined by simulation, and are obtained by measuring the apparent viscosities of the polymer melts at specific temperatures by a rheometer);
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 1.24:1, 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: 1.24.
Specifically, the PTT melt is distributed through the distribution holes A and C and the PET melt is distributed through the distribution holes B and D and is arranged at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the difference between the apparent viscosities of the PET melt and the PTT melt is not more than 5%, each distribution hole is a cylindrical hole with the same height, and the ratio of the diameters of the distribution hole A and the distribution hole B is not equal to the ratio of the diameters of the distribution hole C and the distribution hole D, so that the mass ratio of the PTT melt distributed to the spinning hole m to the PET melt is different from the mass ratio of the PTT melt distributed to the spinning hole n, two different mass ratios of the PTT melt to the PET are shared in a bundle of PTT/PET parallel composite fibers, the difference of the curling forms is ensured, and correspondingly, the quantity and position relations of the distribution holes and the distribution holes are reasonably set, and the smooth distribution is ensured; the invention distributes the spinneret orifices m and the spinneret orifices n according to concentric circles, controls the spinneret orifices on the same circle to be m or n, ensures that a part of PTT/PET parallel composite monofilaments with the mass ratio of PTT to PET being 7:3 can be mixed into the other part of PTT/PET parallel composite monofilaments with the mass ratio of PTT to PET being 3:7, and plays a role in breaking the formation of 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 (0.52-0.58 dL/g) of the PET melt and the intrinsic viscosity (1.10-1.20 dL/g) of the PTT melt, the apparent viscosity of the PET component and the apparent viscosity of the PTT 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 also 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 good crimpling performance, excellent elasticity and good comprehensive performance.
The principle of the invention is as follows:
the torsion stress generated by the spiral curling of the existing PTT/PET parallel composite fiber is the same, so that the fiber on part of yarn segments generates 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 PTT/PET fiber, when a double-component PTT/PET fiber woven fabric is used, the difference of yarn reflection effect and tension unevenness is caused, protrusions or depressions are randomly formed on the surface of the fabric, and uneven transverse stripes with randomly changed brightness and darkness, namely uneven stripe shade, are found in the appearance.
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:
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 FDY process, after a PTT melt and a PET melt are distributed, extruding the PTT melt and the PET melt 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 PTT melt is distributed into the spinneret orifice m through a distribution hole A, the PET melt is distributed into the spinneret orifice m through a distribution hole B, the PTT melt is distributed into the spinneret orifice n through a distribution hole C, and the PET melt is distributed into the spinneret orifice n through a distribution hole D;
ratio of PTT melt flow through distribution hole A (or C) to PET melt flow through distribution hole B (or D)
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 mutual matching of the intrinsic viscosity of the PTT 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 PTT melt at the inlets of the distribution hole A and the distribution hole B are nearly the same (the difference is less than 5 percent), and the apparent viscosities of the PET melt and the PTT melt at the inlets of the distribution hole C and the distribution hole D are nearly the same (the difference is less than 5 percent), so that mu 1 is approximately equal to mu 2; because the apparent viscosities of the PET melt and the PTT 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 smaller sizes, P is realizedThe pressure drop of the TT 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 PTT 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 delta P1 is approximately equal to 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,
and
similarly, the ratio of the flow rate of the PTT melt flowing through the distribution hole A to the flow rate of the PET melt flowing through the distribution hole B is about 7:3 due to the fact that the diameter ratio of the distribution hole A to the diameter ratio of the distribution hole B is 1.24:1, the mass ratio of the PTT to the PET in the monofilaments finally extruded from the spinning hole m is 7:3, and similarly, the ratio of the flow rate of the PTT melt flowing through the distribution hole C to the PET melt flowing through the distribution hole D is about 3:7 due to the fact that the diameter ratio of the distribution hole C to the diameter ratio of the distribution hole D is 1:1.24, and the mass ratio of the PTT to the PET in the monofilaments finally extruded from the spinning hole n is 3: 7;
in addition, the heat shrinkage rates of the PTT and the PET adopted by the invention are different, furthermore, after the PTT and the PET are mixed, the two polymers with different heat shrinkage rates have compatibility, the existence of the compatibility ensures 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 heat shrinkage rate effect ensure that two polymer fibers (namely PTT/PET parallel composite monofilaments) coming out of the same spinneret orifice can form a self-curling shape after relaxation heat treatment, thereby having elasticity, and the self-curling shape is specifically: the PTT component is arranged at the inner side of the spiral crimp, and the PET component is arranged at the outer side of the spiral crimp (as can be seen from the rigidity and flexibility characteristics of PTT and PET molecules, the shrinkage rate of PTT is larger, and the shrinkage rate of PET is smaller, so that the PTT component in the composite fiber is arranged at the inner side of the spiral crimp, and the PET component is arranged at the outer side of the spiral crimp);
in the same fiber bundle, the mass ratio of PTT to PET in one part of PTT/PET parallel composite monofilaments is 7:3, and the mass ratio of PTT to PET in the other part of PTT/PET parallel composite monofilaments is 3:7, so that the curling forms of different monofilaments have certain difference, the difference plays a role in breaking the pure PTT/PET parallel composite monofilaments to form neat left and right spiral forms, the curling directions of the monofilaments of the prepared parallel double-component elastic yarns after relaxation heat treatment are randomly distributed, and the surface of a knitted fabric woven by the double-component elastic yarns does not have random strip shade unevenness.
As a preferred technical scheme:
according to the preparation method of the PTT/PET double-component elastic yarn, the mass ratio of the PTT melt to the PET melt is 50: 50.
According to the preparation method of the PTT/PET bicomponent elastic yarn, the spinneret holes m or n are circular, oval or 8-shaped spinneret holes, the shape of the spinneret holes m or 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 PTT/PET double-component elastic yarn, all the spinneret holes are distributed in concentric circles, and the spinneret holes in the same circle are m or n, so that the PTT/PET parallel composite monofilaments with the mass ratio of PTT to PET being 7:3 can be mixed into the PTT/PET parallel composite monofilaments with the mass ratio of PTT to PET being 3:7, and the effect of forming a neat left and right spiral shape is achieved.
The preparation method of the PTT/PET bicomponent elastic yarn comprises the steps that a spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, a 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 connected with a distribution hole A and a distribution hole B at the same time, and the guide hole F is connected with a distribution hole C and a distribution hole D at the same time; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on the 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 PTT melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam II.
According to the preparation method of the PTT/PET double-component elastic yarn, the intrinsic viscosity of the PET melt is 0.52-0.58 dL/g, the temperature of the spinning box I is 275-280 ℃, the intrinsic viscosity of the PTT melt is 1.10-1.20 dL/g, the temperature of the spinning box II is 260-265 ℃, and the temperature of the spinning box III (the temperature of the spinning box III is the spinning temperature) is 272-276 ℃.
According to the preparation method of the PTT/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 one-roll speed is 2000-2200 m/min, the one-roll temperature is 80-90 ℃, the two-roll speed is 3300-3600 m/min, the two-roll temperature is 135-145 ℃, and the winding speed is 3230-3510 m/min; the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
The invention also provides the PTT/PET double-component elastic yarn prepared by the preparation method of the PTT/PET double-component elastic yarn, which consists of a plurality of PTT/PET parallel composite monofilaments, wherein in the same fiber bundle, the mass ratio of PTT to PET in one part of the PTT/PET parallel composite monofilaments is 7:3, and the mass ratio of PTT to PET in the other part of the PTT/PET parallel composite monofilaments is 3: 7; the single filaments in the PTT/PET double-component elastic filament are randomly distributed in the curling direction.
As a preferred technical scheme:
according to the PTT/PET double-component elastic yarn, the curling shrinkage rate of the PTT/PET double-component elastic yarn is 50-55%, the curling stability is 85-88%, the contraction elongation rate is 95-98%, and the curling elastic recovery rate is 93-96%.
According to the PTT/PET double-component elastic yarn, the breaking strength of the PTT/PET double-component elastic yarn is more than or equal to 2.8cN/dtex, the elongation at break is 45.0 +/-4.5%, and the total titer is 70-200 dtex.
The prepared PTT/PET double-component elastic yarn is made into a knitted fabric for strip shade unevenness condition testing, and the testing process is as follows: 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 PTT/PET double-component elastic yarn of the invention is as follows: the D value of the knitted fabric made of the PTT/PET double-component elastic yarn is less than or equal to 1.0 percent; this shows that the PTT/PET double-component elastic yarn prepared by the invention does not have the problem of uneven strip shade.
Has the advantages that:
(1) according to the preparation method of the PTT/PET double-component elastic yarn, distribution holes with different diameters are adopted, so that the obtained parallel composite fibers contain different component ratios, the generation of a neat and spiral curled surface morphological structure of the fibers is avoided, and strip shade unevenness is avoided;
(2) the PTT/PET double-component elastic yarn prepared by the preparation method of the PTT/PET double-component elastic yarn has the advantages of good crimp 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, 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
A preparation method of PTT/PET double-component elastic yarn comprises the steps of distributing PET melt (the intrinsic viscosity is 0.52dL/g) and PTT melt (the intrinsic viscosity is 1.2dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PTT melt from a spinneret orifice m (circle) and a spinneret orifice n (circle) on the same spinneret plate to prepare FDY yarn, and performing relaxation heat treatment to obtain the PTT/PET double-component elastic yarn;
the distribution refers to that the PTT melt is distributed into a spinneret orifice m through a distribution orifice A and a distribution orifice B; the PTT melt is distributed into a spinneret orifice n through a distribution orifice D at the same time through a distribution orifice C; at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PTT melt are different 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 1.24:1, 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: 1.24;
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 the distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PTT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning manifold I is 280 ℃, the temperature of the spinning manifold II is 265 ℃ and the temperature of the spinning manifold III is 276 ℃;
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 2100m/min, the one-roller temperature is 80 ℃, the two-roller speed is 3460m/min, the two-roller temperature is 135 ℃, and the winding speed is 3410 m/min; the temperature of the relaxation heat treatment was 104 ℃ for 30 min.
The finally prepared PTT/PET double-component elastic yarn consists of a plurality of PTT/PET parallel composite monofilaments, wherein in the same fiber bundle, the mass ratio of PTT to PET in one part of PTT/PET parallel composite monofilaments is 7:3, and the mass ratio of PTT to PET in the other part of PTT/PET parallel composite monofilaments is 3: 7; the single filaments in the PTT/PET double-component elastic filament are randomly distributed in the curling direction; the PTT/PET bicomponent elastic yarn has the crimp shrinkage of 55%, the crimp stability of 88%, the shrinkage elongation of 98%, the crimp elastic recovery of 96%, the breaking strength of 3.12cN/dtex, the elongation at break of 40.5% and the total fineness of 130 dtex.
The prepared PTT/PET double-component elastic 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 PTT/PET double-component elastic yarn is 0.32 percent; this shows that the PTT/PET double-component elastic yarn prepared by the invention does not have the problem of uneven strip shade.
Example 2
A preparation method of PTT/PET double-component elastic yarn comprises the steps of distributing PET melt (the intrinsic viscosity is 0.56dL/g) and PTT melt (the intrinsic viscosity is 1.13dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PTT melt from a spinneret orifice m (oval) and a spinneret orifice n (round) on the same spinneret plate to prepare FDY yarn, and performing relaxation heat treatment to obtain the PTT/PET double-component elastic yarn;
the distribution refers to that the PTT melt is distributed into a spinneret orifice m through a distribution orifice A and a distribution orifice B; the PTT melt is distributed into a spinneret orifice n through a distribution orifice D at the same time through a distribution orifice C; the apparent viscosities of the PET melt and the PTT 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 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 1.24:1, 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: 1.24;
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 the distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PTT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning manifold I is 275 ℃, the temperature of the spinning manifold II is 262 ℃, and the temperature of the spinning manifold III is 274 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 20 ℃, the network pressure is 0.25MPa, the one-roll speed is 2150m/min, the one-roll temperature is 90 ℃, the two-roll speed is 3360m/min, the two-roll temperature is 145 ℃, and the winding speed is 3230 m/min; the temperature of the relaxation heat treatment was 103 ℃ and the time was 28 min.
The finally prepared PTT/PET double-component elastic yarn consists of a plurality of PTT/PET parallel composite monofilaments, wherein in the same fiber bundle, the mass ratio of PTT to PET in one part of PTT/PET parallel composite monofilaments is 7:3, and the mass ratio of PTT to PET in the other part of PTT/PET parallel composite monofilaments is 3: 7; the single filaments in the PTT/PET double-component elastic filament are randomly distributed in the curling direction; the PTT/PET bicomponent elastic yarn has the crimp shrinkage rate of 52.8%, the crimp stability of 84%, the shrinkage elongation of 96%, the crimp elastic recovery rate of 93.4%, the breaking strength of 3.15cN/dtex, the breaking elongation of 42.5% and the total fineness of 115 dtex.
The prepared PTT/PET double-component elastic yarn is prepared into a knitted fabric for strip shade unevenness condition test, and the test results are as follows: the D value of a knitted fabric made of the PTT/PET double-component elastic yarn is 0.43 percent; this shows that the PTT/PET double-component elastic yarn prepared by the invention does not have the problem of uneven strip shade.
Example 3
A preparation method of PTT/PET double-component elastic yarn comprises the steps of distributing PET melt (the intrinsic viscosity is 0.58dL/g) and PTT melt (the intrinsic viscosity is 1.17dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PTT melt from a spinneret orifice m (circle) and a spinneret orifice n (circle) on the same spinneret plate to prepare FDY yarn, and performing relaxation heat treatment to obtain the PTT/PET double-component elastic yarn;
the distribution refers to that the PTT melt is distributed into a spinneret orifice m through a distribution orifice A and a distribution orifice B; the PTT melt is distributed into a spinneret orifice n through a distribution orifice D at the same time through a distribution orifice C; the apparent viscosities of the PET melt and the PTT 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 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 1.24:1, 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: 1.24;
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 the distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PTT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning manifold I is 276 ℃, the temperature of the spinning manifold II is 264 ℃, and the temperature of the spinning manifold III is 275 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 21 ℃, the network pressure is 0.23MPa, the one-roller speed is 2100m/min, the one-roller temperature is 86 ℃, the two-roller speed is 3300m/min, the two-roller temperature is 136 ℃, and the winding speed is 3270 m/min; the temperature of the relaxation heat treatment is 120 deg.C, and the time is 29 min.
The finally prepared PTT/PET double-component elastic yarn consists of a plurality of PTT/PET parallel composite monofilaments, wherein in the same fiber bundle, the mass ratio of PTT to PET in one part of PTT/PET parallel composite monofilaments is 7:3, and the mass ratio of PTT to PET in the other part of PTT/PET parallel composite monofilaments is 3: 7; the single filaments in the PTT/PET double-component elastic filament are randomly distributed in the curling direction; the PTT/PET bicomponent elastic yarn has the crimp shrinkage rate of 52%, the crimp stability of 86.5%, the shrinkage elongation of 96.7%, the crimp elastic recovery rate of 95.7%, the breaking strength of 2.95cN/dtex, the breaking elongation of 44.5% and the total fineness of 125 dtex.
The prepared PTT/PET double-component elastic 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 PTT/PET double-component elastic yarn is 0.66%; this shows that the PTT/PET double-component elastic yarn prepared by the invention does not have the problem of uneven strip shade.
Example 4
A preparation method of PTT/PET double-component elastic yarn comprises the steps of distributing PET melt (the intrinsic viscosity is 0.53dL/g) and PTT melt (the intrinsic viscosity is 1.1dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PTT melt from a spinneret orifice m (circle) and a spinneret orifice n (circle) on the same spinneret plate to prepare FDY yarn, and performing relaxation heat treatment to obtain the PTT/PET double-component elastic yarn;
the distribution refers to that the PTT melt is distributed into a spinneret orifice m through a distribution orifice A and a distribution orifice B; the PTT melt is distributed into a spinneret orifice n through a distribution orifice D at the same time through a distribution orifice C; at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PTT melt are different 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 1.24:1, 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: 1.24;
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 the distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PTT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning beam I is 279 ℃, the temperature of the spinning beam II is 260 ℃, and the temperature of the spinning beam III is 276 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 23 ℃, the network pressure is 0.24MPa, the one-roll speed is 2050m/min, the one-roll temperature is 80 ℃, the two-roll speed is 3600m/min, the two-roll temperature is 138 ℃, and the winding speed is 3370 m/min; the temperature of the relaxation heat treatment is 90 deg.C, and the time is 24 min.
The finally prepared PTT/PET double-component elastic yarn consists of a plurality of PTT/PET parallel composite monofilaments, wherein in the same fiber bundle, the mass ratio of PTT to PET in one part of PTT/PET parallel composite monofilaments is 7:3, and the mass ratio of PTT to PET in the other part of PTT/PET parallel composite monofilaments is 3: 7; the single filaments in the PTT/PET double-component elastic filament are randomly distributed in the curling direction; the PTT/PET bicomponent elastic yarn has the crimp shrinkage rate of 52.5%, the crimp stability of 87.3%, the shrinkage elongation of 97.9%, the crimp elastic recovery rate of 95.5%, the breaking strength of 2.83cN/dtex, the breaking elongation of 49% and the total fineness of 105 dtex.
The prepared PTT/PET double-component elastic yarn is prepared into a knitted fabric for strip shade unevenness condition test, and the test results are as follows: the D value of a knitted fabric made of the PTT/PET double-component elastic yarn is 0.71 percent; this shows that the PTT/PET double-component elastic yarn prepared by the invention does not have the problem of uneven strip shade.
Example 5
A preparation method of PTT/PET double-component elastic yarn comprises the steps of distributing PET melt (the intrinsic viscosity is 0.53dL/g) and PTT melt (the intrinsic viscosity is 1.13dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PTT melt from a spinneret orifice m (oval) and a spinneret orifice n (oval) on the same spinneret plate to prepare FDY yarn, and performing relaxation heat treatment to obtain the PTT/PET double-component elastic yarn;
the distribution refers to that the PTT melt is distributed into a spinneret orifice m through a distribution orifice A and a distribution orifice B; the PTT melt is distributed into a spinneret orifice n through a distribution orifice D at the same time through a distribution orifice C; at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PTT melt are different 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 1.24:1, 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: 1.24;
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 the distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PTT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning manifold I is 280 ℃, the temperature of the spinning manifold II is 263 ℃, and the temperature of the spinning manifold III is 275 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 24 ℃, the network pressure is 0.28MPa, the one-roll speed is 2065m/min, the one-roll temperature is 87 ℃, the two-roll speed is 3480m/min, the two-roll temperature is 136 ℃, and the winding speed is 3360 m/min; the temperature of the relaxation heat treatment was 105 ℃ for 25 min.
The finally prepared PTT/PET double-component elastic yarn consists of a plurality of PTT/PET parallel composite monofilaments, wherein in the same fiber bundle, the mass ratio of PTT to PET in one part of PTT/PET parallel composite monofilaments is 7:3, and the mass ratio of PTT to PET in the other part of PTT/PET parallel composite monofilaments is 3: 7; the single filaments in the PTT/PET double-component elastic filament are randomly distributed in the curling direction; the PTT/PET bicomponent elastic yarn has the crimp shrinkage of 51.6%, the crimp stability of 86%, the shrinkage elongation of 95.8%, the crimp elastic recovery of 95.8%, the breaking strength of 3.4cN/dtex, the elongation at break of 40% and the total fineness of 70 dtex.
The prepared PTT/PET double-component elastic 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 PTT/PET double-component elastic yarn is 0.88%; this shows that the PTT/PET double-component elastic yarn prepared by the invention does not have the problem of uneven strip shade.
Example 6
A preparation method of PTT/PET double-component elastic yarn comprises the steps of distributing PET melt (the intrinsic viscosity is 0.54dL/g) and PTT melt (the intrinsic viscosity is 1.12dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PTT melt from a spinneret orifice m (8-shaped) and a spinneret orifice n (oval) on the same spinneret plate to prepare FDY yarn, and then performing relaxation heat treatment to obtain the PTT/PET double-component elastic yarn;
the distribution refers to that the PTT melt is distributed into a spinneret orifice m through a distribution orifice A and a distribution orifice B; the PTT melt is distributed into a spinneret orifice n through a distribution orifice D at the same time through a distribution orifice C; at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PTT melt are different 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 1.24:1, 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: 1.24;
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 the distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PTT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning manifold I is 278 ℃, the temperature of the spinning manifold II is 260 ℃, and the temperature of the spinning manifold III is 276 ℃;
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 2000m/min, the one-roll temperature is 85 ℃, the two-roll speed is 3380m/min, the two-roll temperature is 135 ℃, and the winding speed is 3510 m/min; the temperature of the relaxation heat treatment is 104 ℃ and the time is 20 min.
The finally prepared PTT/PET double-component elastic yarn consists of a plurality of PTT/PET parallel composite monofilaments, wherein in the same fiber bundle, the mass ratio of PTT to PET in one part of PTT/PET parallel composite monofilaments is 7:3, and the mass ratio of PTT to PET in the other part of PTT/PET parallel composite monofilaments is 3: 7; the single filaments in the PTT/PET double-component elastic filament are randomly distributed in the curling direction; the PTT/PET double-component elastic yarn has the crimp shrinkage of 50%, the crimp stability of 85%, the shrinkage elongation of 95%, the crimp elastic recovery of 93%, the breaking strength of 3.3cN/dtex, the elongation at break of 43% and the total fineness of 105 dtex.
The prepared PTT/PET double-component elastic yarn is prepared into a knitted fabric for strip shade unevenness condition test, and the test results are as follows: the D value of a knitted fabric made of the PTT/PET double-component elastic yarn is 0.54 percent; this shows that the PTT/PET double-component elastic yarn prepared by the invention does not have the problem of uneven strip shade.
Example 7
A preparation method of PTT/PET double-component elastic yarn comprises the steps of distributing PET melt (the intrinsic viscosity is 0.52dL/g) and PTT melt (the intrinsic viscosity is 1.18dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PTT melt from a spinneret orifice m (oval) and a spinneret orifice n (8 shape) on the same spinneret plate to prepare FDY yarn, and then carrying out relaxation heat treatment to obtain the PTT/PET double-component elastic yarn;
the distribution refers to that the PTT melt is distributed into a spinneret orifice m through a distribution orifice A and a distribution orifice B; the PTT melt is distributed into a spinneret orifice n through a distribution orifice D at the same time through a distribution orifice C; the apparent viscosities of the PET melt and the PTT 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 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 1.24:1, 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: 1.24;
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 the distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PTT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning manifold I is 277 ℃, the temperature of the spinning manifold II is 260 ℃, and the temperature of the spinning manifold III is 273 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 24 ℃, the network pressure is 0.22MPa, the one-roll speed is 2200m/min, the one-roll temperature is 88 ℃, the two-roll speed is 3350m/min, the two-roll temperature is 138 ℃, and the winding speed is 3280 m/min; the temperature of the relaxation heat treatment was 114 ℃ for 23 min.
The finally prepared PTT/PET double-component elastic yarn consists of a plurality of PTT/PET parallel composite monofilaments, wherein in the same fiber bundle, the mass ratio of PTT to PET in one part of PTT/PET parallel composite monofilaments is 7:3, and the mass ratio of PTT to PET in the other part of PTT/PET parallel composite monofilaments is 3: 7; the single filaments in the PTT/PET double-component elastic filament are randomly distributed in the curling direction; the PTT/PET bicomponent elastic yarn has the crimp shrinkage rate of 52.2%, the crimp stability of 87%, the shrinkage elongation of 96.5%, the crimp elastic recovery rate of 94.3%, the breaking strength of 2.8cN/dtex, the elongation at break of 50% and the total fineness of 116 dtex.
The prepared PTT/PET double-component elastic yarn is prepared into a knitted fabric for strip shade unevenness condition test, and the test results are as follows: the D value of a knitted fabric made of the PTT/PET double-component elastic yarn is 0.22%; this shows that the PTT/PET double-component elastic yarn prepared by the invention does not have the problem of uneven strip shade.
Example 8
A preparation method of PTT/PET double-component elastic yarn comprises the steps of distributing PET melt (intrinsic viscosity is 0.54dL/g) and PTT melt (intrinsic viscosity is 1.13dL/g) with the mass ratio of 50:50 according to an FDY process, extruding the PET melt and the PTT melt from a spinneret orifice m (circle) and a spinneret orifice n (8 shape) on the same spinneret plate to prepare FDY yarn, and then carrying out relaxation heat treatment to obtain the PTT/PET double-component elastic yarn;
the distribution refers to that the PTT melt is distributed into a spinneret orifice m through a distribution orifice A and a distribution orifice B; the PTT melt is distributed into a spinneret orifice n through a distribution orifice D at the same time through a distribution orifice C; at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PTT melt are different 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 1.24:1, 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: 1.24;
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 the distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PTT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning beam I is 279 ℃, the temperature of the spinning beam II is 264 ℃, and the temperature of the spinning beam III is 272 ℃;
the parameters of the FDY process are as follows: the cooling temperature is 20 ℃, the network pressure is 0.27MPa, the one-roll speed is 2180m/min, the one-roll temperature is 89 ℃, the two-roll speed is 3500m/min, the two-roll temperature is 139 ℃, and the winding speed is 3260 m/min; the temperature of the relaxation heat treatment was 101 ℃ and the time was 29 min.
The finally prepared PTT/PET double-component elastic yarn consists of a plurality of PTT/PET parallel composite monofilaments, wherein in the same fiber bundle, the mass ratio of PTT to PET in one part of PTT/PET parallel composite monofilaments is 7:3, and the mass ratio of PTT to PET in the other part of PTT/PET parallel composite monofilaments is 3: 7; the single filaments in the PTT/PET double-component elastic filament are randomly distributed in the curling direction; the PTT/PET bicomponent elastic yarn has the crimp shrinkage of 51.7%, the crimp stability of 86.8%, the shrinkage elongation of 96%, the crimp elastic recovery of 95.1%, the breaking strength of 3.2cN/dtex, the elongation at break of 43.8% and the total fineness of 200 dtex.
The prepared PTT/PET double-component elastic yarn is prepared into a knitted fabric for strip shade unevenness condition test, and the test results are as follows: the D value of a knitted fabric made of the PTT/PET double-component elastic yarn is 0.64%; this shows that the PTT/PET double-component elastic yarn prepared by the invention does not have the problem of uneven strip shade.
Claims (9)
1. A preparation method of PTT/PET double-component elastic yarn is characterized by comprising the following steps: according to the FDY process, after PET melt and PTT melt are distributed, FDY filaments are extruded from a spinneret orifice m and a spinneret orifice n on the same spinneret plate and then are subjected to relaxation heat treatment, and PTT/PET double-component elastic filaments are obtained;
the distribution refers to that the PTT melt is distributed into a spinneret orifice m through a distribution orifice A and a distribution orifice B; the PTT melt is distributed into a spinneret orifice n through a distribution orifice D at the same time through a distribution orifice C;
at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PTT melt are different by no more than 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 1.24:1, 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: 1.24;
the prepared PTT/PET double-component elastic yarn consists of a plurality of PTT/PET parallel composite monofilaments, wherein in the same fiber bundle, the mass ratio of PTT to PET in one part of PTT/PET parallel composite monofilaments is 7:3, and the mass ratio of PTT to PET in the other part of PTT/PET parallel composite monofilaments is 3: 7; the single filaments in the PTT/PET double-component elastic filament are randomly distributed in the curling direction.
2. The method for preparing PTT/PET bicomponent elastic yarn according to claim 1, wherein the mass ratio of the PTT melt to the PET melt is 50: 50.
3. The method for preparing PTT/PET bicomponent elastic yarn according to claim 1, wherein the spinneret hole m or the spinneret hole n is a circular, oval or 8-shaped spinneret hole.
4. The method for preparing PTT/PET bicomponent elastic yarn according to claim 1, wherein all the spinneret holes are distributed in concentric circles, and the spinneret holes on the same circle are all m or all n.
5. The method for preparing the PTT/PET bicomponent elastic yarn as claimed in claim 1, wherein the spinneret hole m is composed of a guide hole E, a transition hole and a capillary hole which are connected in sequence, the spinneret hole n is composed of a guide hole F, a transition hole and a capillary hole 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 located on the 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 PTT melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam II.
6. The preparation method of the PTT/PET double-component elastic yarn as claimed in claim 5, wherein the intrinsic viscosity of the PET melt is 0.52-0.58 dL/g, the temperature of a spinning beam I is 275-280 ℃, the intrinsic viscosity of the PTT melt is 1.10-1.20 dL/g, the temperature of a spinning beam II is 260-265 ℃, and the temperature of a spinning beam III is 272-276 ℃.
7. The preparation method of the PTT/PET double-component elastic yarn according to claim 6, 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 one-roll speed is 2000-2200 m/min, the one-roll temperature is 80-90 ℃, the two-roll speed is 3300-3600 m/min, the two-roll temperature is 135-145 ℃, and the winding speed is 3230-3510 m/min; the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
8. The method for preparing the PTT/PET two-component elastic yarn according to claim 1, wherein the PTT/PET two-component elastic yarn has a crimp shrinkage of 50-55%, a crimp stability of 85-88%, a compression elongation of 95-98%, and a crimp elastic recovery of 93-96%.
9. The preparation method of the PTT/PET double-component elastic yarn as claimed in claim 1, wherein the PTT/PET double-component elastic yarn has a breaking strength of not less than 2.8cN/dtex, an elongation at break of 45.0 +/-4.5%, and a total fineness of 70-200 dtex.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911351546.0A CN110983466B (en) | 2019-12-24 | 2019-12-24 | PTT/PET double-component elastic yarn and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911351546.0A CN110983466B (en) | 2019-12-24 | 2019-12-24 | PTT/PET double-component elastic yarn and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110983466A CN110983466A (en) | 2020-04-10 |
| CN110983466B true CN110983466B (en) | 2021-11-16 |
Family
ID=70075086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911351546.0A Active CN110983466B (en) | 2019-12-24 | 2019-12-24 | PTT/PET double-component elastic yarn and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110983466B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113445142A (en) * | 2021-05-28 | 2021-09-28 | 桐昆集团股份有限公司 | Production method of cool feeling cable elastic fiber |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1323834A (en) * | 1970-07-20 | 1973-07-18 | Mitsubishi Rayon Co | Spinneret for spinning composite filaments |
| US4307054A (en) * | 1977-12-22 | 1981-12-22 | Rhone-Poulenc-Textile | Process for the production of bi-component yarns |
| KR900001318B1 (en) * | 1985-12-27 | 1990-03-08 | 짓소 가부시끼가이샤 | Spinneret for conjugated spinning |
| 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 |
| CN201053043Y (en) * | 2007-04-05 | 2008-04-30 | 深圳市中晟纤维工程技术有限公司 | Composite thread spraying plate for producing parallel peanut-shape elastic fiber |
| JP2009127151A (en) * | 2007-11-26 | 2009-06-11 | Teijin Fibers Ltd | Spinneret for melt-spinning sea-island type conjugate fiber |
| JP2011195989A (en) * | 2010-03-19 | 2011-10-06 | Toray Ind Inc | Spinning pack and method for producing filament yarn |
| CN103789928A (en) * | 2014-01-28 | 2014-05-14 | 嘉兴学院 | Crimping fiber elastic non-woven fabric and manufacturing method thereof |
| CN104195656A (en) * | 2014-08-26 | 2014-12-10 | 江苏巨鸿超细纤维制造有限公司 | Distributing plate of composite spinning assembly of polyester and chinlon composite yarn |
| CN105803548A (en) * | 2014-12-31 | 2016-07-27 | 大连华阳新材料科技股份有限公司 | Two-component blending spinning assembly |
| CN107012522A (en) * | 2017-05-04 | 2017-08-04 | 无锡力扬纤维有限公司 | Produce the production line and its production technology of Three-dimensional crimped hollow type terylene short fiber |
| CN206467344U (en) * | 2016-12-31 | 2017-09-05 | 浦江鑫远喷丝板有限公司 | A kind of two-component composite spinneret component |
| CN108866663A (en) * | 2018-09-20 | 2018-11-23 | 陈浩然 | A kind of Regenerated Polyester Fibres device for spinning |
| CN110565184A (en) * | 2019-08-27 | 2019-12-13 | 桐昆集团股份有限公司 | Preparation method of high-self-crimpability PET/PTT parallel composite filament |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02221414A (en) * | 1989-02-23 | 1990-09-04 | Mitsubishi Rayon Co Ltd | Conjugated fiber yarn |
| JP2003041425A (en) * | 2001-07-25 | 2003-02-13 | Teijin Ltd | Method of production for composite fiber having latent crimp |
| JP4205500B2 (en) * | 2003-06-26 | 2009-01-07 | ソロテックス株式会社 | Hollow polytrimethylene terephthalate composite short fiber and method for producing the same |
| CN105177740A (en) * | 2015-08-10 | 2015-12-23 | 东华大学 | A two-component abnormity hollow high moisture absorption curling composite fiber and a preparation method thereof |
| CN106591978A (en) * | 2016-11-14 | 2017-04-26 | 浙江理工大学 | Curly two-color nylon fiber processing technology |
| CN107955982B (en) * | 2017-11-10 | 2019-11-01 | 南通华盛高聚物科技股份有限公司 | A kind of preparation method of the PLA/PET parallel composite fiber of moisture absorbing and sweat releasing |
| CN110528115B (en) * | 2019-08-19 | 2022-08-23 | 浙江恒逸石化研究院有限公司 | Bi-component parallel crimped composite fiber and preparation method thereof |
-
2019
- 2019-12-24 CN CN201911351546.0A patent/CN110983466B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1323834A (en) * | 1970-07-20 | 1973-07-18 | Mitsubishi Rayon Co | Spinneret for spinning composite filaments |
| US4307054A (en) * | 1977-12-22 | 1981-12-22 | Rhone-Poulenc-Textile | Process for the production of bi-component yarns |
| KR900001318B1 (en) * | 1985-12-27 | 1990-03-08 | 짓소 가부시끼가이샤 | Spinneret for conjugated spinning |
| 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 |
| CN201053043Y (en) * | 2007-04-05 | 2008-04-30 | 深圳市中晟纤维工程技术有限公司 | Composite thread spraying plate for producing parallel peanut-shape elastic fiber |
| JP2009127151A (en) * | 2007-11-26 | 2009-06-11 | Teijin Fibers Ltd | Spinneret for melt-spinning sea-island type conjugate fiber |
| JP2011195989A (en) * | 2010-03-19 | 2011-10-06 | Toray Ind Inc | Spinning pack and method for producing filament yarn |
| CN103789928A (en) * | 2014-01-28 | 2014-05-14 | 嘉兴学院 | Crimping fiber elastic non-woven fabric and manufacturing method thereof |
| CN104195656A (en) * | 2014-08-26 | 2014-12-10 | 江苏巨鸿超细纤维制造有限公司 | Distributing plate of composite spinning assembly of polyester and chinlon composite yarn |
| CN105803548A (en) * | 2014-12-31 | 2016-07-27 | 大连华阳新材料科技股份有限公司 | Two-component blending spinning assembly |
| CN206467344U (en) * | 2016-12-31 | 2017-09-05 | 浦江鑫远喷丝板有限公司 | A kind of two-component composite spinneret component |
| CN107012522A (en) * | 2017-05-04 | 2017-08-04 | 无锡力扬纤维有限公司 | Produce the production line and its production technology of Three-dimensional crimped hollow type terylene short fiber |
| CN108866663A (en) * | 2018-09-20 | 2018-11-23 | 陈浩然 | A kind of Regenerated Polyester Fibres device for spinning |
| CN110565184A (en) * | 2019-08-27 | 2019-12-13 | 桐昆集团股份有限公司 | Preparation method of high-self-crimpability PET/PTT parallel composite filament |
Non-Patent Citations (1)
| Title |
|---|
| PTT/PET双组分长丝针织物布面不匀的成因分析;焦青保等;《纺织学报》;20090131;第30卷(第1期);第42-45页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110983466A (en) | 2020-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111118628B (en) | PBT/PET double-component elastic yarn and preparation method thereof | |
| CN110983466B (en) | PTT/PET double-component elastic yarn and preparation method thereof | |
| CN110983465B (en) | Method for preparing self-curling elastic combined filament yarn for knitting | |
| JP7316444B2 (en) | Core-sheath type composite false-twisted yarn and method for producing the same | |
| CN111041578B (en) | PET (polyethylene terephthalate) double-component elastic yarn with different viscosities and preparation method thereof | |
| CN111118665B (en) | Polyester-nylon composite yarn and preparation method thereof | |
| CN111101235B (en) | CDP/PET double-component composite filament by one-step method and preparation method thereof | |
| CN111118629B (en) | Moisture-absorbing antibacterial knitted fabric and preparation method thereof | |
| CN111101237B (en) | High-low viscosity PET parallel composite self-crimping fiber and preparation method thereof | |
| CN110965196B (en) | Sports knitted fabric and preparation method thereof | |
| CN111118663B (en) | PBT/PTT double-component elastic yarn and preparation method thereof | |
| CN111101236B (en) | Self-curling elastic combined filament yarn for knitted denim and preparation method thereof | |
| CN111118630B (en) | Soft polyester fiber and preparation method thereof | |
| CN111058115B (en) | Preparation method of crescent self-crimping elastic fiber | |
| CN111101264B (en) | Shrink-proof non-ironing wool-like fabric and preparation method thereof | |
| JPH0651925B2 (en) | Fiber with special cross-sectional shape | |
| CN111041577B (en) | PET/modified PET double-component elastic yarn and preparation method thereof | |
| CN111118712B (en) | Imitated silk elastic knitted underwear fabric and preparation method thereof | |
| KR102100565B1 (en) | Core-sheath type composite false-twist yarn and manufacturing method thereof | |
| CN111118664B (en) | Parallel self-curling wool-like elastic fiber and preparation method thereof | |
| CN111118627B (en) | Heat-humidity comfortable knitted fabric and preparation method thereof | |
| CN206438229U (en) | A kind of polyester composite filament with double-colored and light effect | |
| KR100859085B1 (en) | Polyester mixed yarn and its manufacturing method | |
| CN111005083A (en) | Parallel self-crimping POY-DT silk elastic fiber and preparation method thereof | |
| JP2009191374A (en) | Woven or knitted fabric |
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 |