CN111041578A - PET (polyethylene terephthalate) double-component elastic yarn with different viscosities and preparation method thereof - Google Patents
PET (polyethylene terephthalate) double-component elastic yarn with different viscosities and preparation method thereof Download PDFInfo
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D4/00—Spinnerette packs; Cleaning thereof
- D01D4/02—Spinnerettes
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- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
- D01D10/02—Heat treatment
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/082—Melt spinning methods of mixed yarn
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/22—Formation of filaments, threads, or the like with a crimped or curled structure; with a special structure to simulate wool
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/32—Side-by-side structure; Spinnerette packs therefor
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- 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
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
- D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
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- D—TEXTILES; PAPER
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- 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
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/06—Load-responsive characteristics
- D10B2401/061—Load-responsive characteristics elastic
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Abstract
The invention relates to PET double-component elastic yarns with different viscosities and a preparation method thereof, wherein the PET double-component elastic yarns with different viscosities are extruded on the same spinneret plate, and a high-viscosity PET melt is divided into two paths: one path is directly extruded after being distributed; the other path of the extruded PET melt is distributed together with the low-viscosity PET melt in a parallel composite spinning mode and then extruded, the number ratio of spinneret orifices m through which the extruded PET melt flows directly to spinneret orifices n through which the extruded PET melt flows after being distributed in the parallel composite spinning mode is 1: 6-8, FDY yarns are prepared according to an FDY process after the extruded PET melt is extruded, and then relaxation heat treatment is carried out, so that PET double-component elastic yarns with different viscosities are obtained; the prepared two-component elastic yarn is composed of high-viscosity PET monofilament and high-viscosity PET/low-viscosity PET parallel composite monofilament, and the single monofilaments in the two-component elastic yarn are randomly distributed in the curling direction. The high-low viscosity PET parallel composite fiber prepared by the invention has low cost, and has no problem of uneven stripe shade when being applied to knitted fabrics.
Description
Technical Field
The invention belongs to the technical field of polyester fibers, and relates to a PET (polyethylene terephthalate) two-component elastic yarn with different viscosities and a preparation method thereof.
Background
The elastic fiber has irreplaceable effect on the garment fabric, so that the elastic fiber has a very important position in the textile industry, wherein the self-crimping fiber prepared by side-by-side compounding becomes an important branch of the elastic fiber, and the elastic fiber is a research hotspot of many domestic and foreign scholars.
At present, many reports about development and application of two-component parallel composite fibers are reported, most of the two-component parallel composite fibers are prepared by using two polyesters or modified polyesters with different properties through a melt composite spinning method, wherein the composite fibers using PET and PTT as raw materials are most widely applied, and are most representative of T400 produced by DuPont company. After heat treatment, the composite fiber can generate a permanent three-dimensional spiral curling structure, so that the fabric has excellent bulkiness, high elasticity and excellent coverage, and is widely applied to the field of textile and clothing. But the PTT raw material has relatively high price, so that the products cannot be produced on a large scale to a certain extent.
The recycling green economy is one of the mainstream economic development in the world at present, and due to the increasing shortage of resources and the requirement of environmental protection, the recycling of fabrics is more and more emphasized. The diversity of polymer materials in the fabric is the most important factor for limiting the recycling of the fabric, and the sorting/separation of different kinds of polymer materials is extremely difficult and has huge cost.
Patent CN201420425923.7 discloses a PET composite elastic fiber, which utilizes PET slices with different viscosities to prepare PET parallel composite fibers by adjusting the temperature of a spinning assembly, the obtained composite fibers have good elasticity and strength, can be used as polyester stretch yarn products, are low in production cost, can improve the elasticity and hand feeling of polyester fabrics, and are chlorine bleaching resistant and good in chemical stability. However, the PET composite fiber with different viscosity is only suitable for manufacturing woven fabrics, and very troublesome problems occur when the PET composite fiber is promoted to be more widely applied to the knitting field: because the side-by-side bicomponent fiber forms a regular spiral crimp structure during heat shrinkage, the surface of the woven knitted fabric has random strip-shaped uneven shade, and the method is particularly obvious on plain knitted fabrics.
Therefore, it is very important to develop a PET bicomponent elastic fiber with different viscosities, which can avoid the random strip shade unevenness when applied to knitted fabrics.
Disclosure of Invention
The invention provides a PET (polyethylene terephthalate) bicomponent elastic yarn with different viscosities and a preparation method thereof, and aims to solve the problem of random strip shade unevenness when high-viscosity PET/low-viscosity PET parallel bicomponent fibers are applied to knitted fabric products in the prior art. According to the invention, a mode of replacing a part of the high-viscosity PET/low-viscosity PET parallel composite fibers with high-viscosity PET fibers is adopted, and the shrinkage modes and forms of the high-viscosity PET fibers and the high-viscosity PET/low-viscosity PET parallel composite fibers are different, so that the neat left and right spiral forms formed by the pure high-viscosity PET/low-viscosity PET parallel composite fibers are broken, and the problem of uneven stripe shade of a knitted fabric prepared from the high-viscosity PET/low-viscosity PET parallel composite fibers is solved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the preparation method of the PET two-component elastic yarns with different viscosities comprises the steps of extruding the PET two-component elastic yarns with different viscosities on the same spinneret plate;
splitting the high-viscosity PET melt into two paths: one path is directly extruded after being distributed; the other path of the melt is distributed together with the low-viscosity PET melt according to a parallel composite spinning mode and then extruded; the viscosity of the high-viscosity PET melt and the viscosity of the low-viscosity PET melt are relative, namely the two PET melts are high-viscosity PET melt with relatively higher viscosity and low-viscosity PET melt with relatively lower viscosity;
the number ratio of the spinneret orifices m for directly extruding flow to the spinneret orifices n for extruding flow after being distributed in the parallel composite spinning mode is 1: 6-8;
and (3) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain the PET double-component elastic yarns with different viscosities.
Specifically, the invention adopts the mode of dividing the high-viscosity PET melt into two paths, wherein one path is directly extruded after being distributed, and the other path and the low-viscosity PET melt are extruded after being distributed in a parallel composite spinning mode to realize 'replacement', and correspondingly, the quantity and the position relation of the distribution holes and the guide holes are reasonably set so as to ensure the smooth operation of the division; the invention ensures that the replaced part occupies proper proportion of the whole by controlling the ratio of the number of the spinneret orifices m which directly extrude and flow through and the number of the spinneret orifices n which extrude and flow through after being distributed according to the parallel composite spinning mode, thereby not only effectively solving the problem of uneven strip shade, but also maintaining the excellent performance of the high-viscosity PET/low-viscosity PET parallel composite fiber; the spinneret orifices m and the spinneret orifices n are arranged according to concentric circles, and the spinneret orifices m are controlled to be positioned in the inner rings of the concentric circles as much as possible, so that the high-viscosity PET fibers can be fully doped into the high-viscosity PET/low-viscosity PET parallel composite fibers, and the effect of breaking the pure high-viscosity PET/low-viscosity PET parallel composite fibers to form regular left and right spiral forms is exerted; 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 (0.70-0.75 dL/g) of the high-viscosity PET melt and the intrinsic viscosity (0.50-0.55 dL/g) of the low-viscosity PET melt, the apparent viscosities of the high-viscosity PET component and the low-viscosity PET component extruded from a spinneret orifice are relatively close, and the smooth spinning is ensured; the shape of the spinneret orifice is not required to be adjusted, and the common single-component spinneret orifice and the parallel composite spinneret orifice are selected; the invention selects the FDY process and reasonably sets the parameters of the FDY process, and the prepared product has good curling property, good elasticity and better comprehensive performance.
The principle of the invention is as follows:
in the prior art, the three-dimensional spiral crimp of the high-viscosity PET/low-viscosity PET double-component parallel composite fiber can straighten under the stretching action of external force and well return to the original crimp state when the external force action is removed. Research shows that in a bundle of high-viscosity PET/low-viscosity PET filaments, the appearance curling form of the high-viscosity PET/low-viscosity PET filaments is provided with ordered left and right spiral yarn sections and random curling yarn sections, and the length and the arrangement of each yarn section are random on the whole. Due to the difference of fiber inclination state and mechanical response behavior, when the double-component high-viscosity PET/low-viscosity PET filament is used for weaving the fabric, the difference of yarn reflection effect and tension unevenness is caused, protrusions or depressions are randomly formed on the cloth surface, and uneven transverse stripes with randomly changed brightness and darkness, namely uneven stripe shade, are found in the appearance.
The high-viscosity PET monofilament and the high-viscosity PET/low-viscosity PET parallel composite monofilament form a mixed filament yarn, the high-viscosity PET/low-viscosity PET parallel composite monofilament obtains three-dimensional crimped fiber after relaxation heat treatment, and the high-viscosity PET/low-viscosity PET parallel composite monofilament has a neat left and right spiral form, while the high-viscosity PET monofilament does not curl after relaxation heat treatment, the mixed filament yarn formed by the high-viscosity PET monofilament and the high-viscosity PET/low-viscosity PET parallel composite monofilament is equivalent to a state that part of high-viscosity PET monofilament replaces the high-viscosity PET/low-viscosity PET parallel composite monofilament, so that the neat left and right spiral form of the pure high-viscosity PET/low-viscosity PET bi-component fiber is broken; the number ratio of the high-viscosity PET monofilaments (corresponding to the spinneret holes m) to the high-viscosity PET/low-viscosity PET parallel composite monofilaments (corresponding to the spinneret holes n) in the same mixed filament bundle is 1: 6-8, the high-viscosity PET monofilaments have the effect of breaking and forming a neat left and right spiral form, the high-viscosity PET/low-viscosity PET parallel composite monofilaments have the effect of providing elasticity for the mixed filament through self-curling, too many high-viscosity PET monofilaments can not well reflect the performance of the composite filament, too few high-viscosity PET monofilaments can not play the role of breaking and forming the neat left and right spiral form, the high-viscosity PET monofilaments and the high-viscosity PET/low-viscosity PET parallel composite monofilaments are mixed according to a specific proportion, the elasticity of the mixed filament is ensured, the neat left and right spiral form formed by the high-viscosity PET/low-viscosity PET parallel composite monofilaments is broken, and the curling form of each high-viscosity PET/low-viscosity PET parallel composite monofilament is different from other fibers, thereby eliminating the uneven shape of the bar-shaped yin.
As a preferred technical scheme:
according to the preparation method of the PET bicomponent elastic yarn with different viscosities, the mass ratio of the high-viscosity PET melt passing through the spinneret hole n to the low-viscosity PET melt is 50:50, and the equivalent diameter ratio of the spinneret hole m to the spinneret hole n is 1: 1.
According to the preparation method of the PET bicomponent elastic yarn with different viscosities, the spinneret holes m are circular, oval, triangular, Y-shaped, cross-shaped, 8-shaped, rectangular or straight spinneret holes, and the spinneret holes n are circular, oval or 8-shaped spinneret holes.
According to the preparation method of the PET bicomponent elastic yarn with different viscosities, all the spinneret holes are distributed in concentric circles, the spinneret holes on the same circle are m or n, and the spinneret holes on the outermost circle are n, so that the high-viscosity PET monofilament is guaranteed to be mixed into the middle of the high-viscosity PET/low-viscosity PET parallel composite monofilament, and the effect of forming a neat left and right spiral form is achieved; otherwise, more high-viscosity PET monofilaments are distributed on the outermost circle, so that the high-viscosity PET/low-viscosity PET side-by-side composite monofilaments inside still have a neat left-right spiral shape.
In the preparation method of the PET bicomponent elastic yarn with different viscosities, the parameters of the FDY process are as follows: the cooling temperature is 20-25 ℃, the network pressure is 0.20-0.30 MPa, the first roller speed is 2200-2400 m/min, the first roller temperature is 85-95 ℃, the second roller speed is 3500-3700 m/min, the second roller temperature is 150-160 ℃, and the winding speed is 3430-3610 m/min; the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
According to the preparation method of the PET bicomponent elastic yarn with different viscosities, the spinneret orifice m is composed of the guide orifice E, the transition orifice and the capillary micropore which are connected in sequence, the spinneret orifice n is composed of the guide orifice D, the transition orifice and the capillary micropore which are connected in sequence, the guide orifice E is connected with the distribution orifice A, and the guide orifice D is simultaneously connected with the distribution orifice B and the distribution orifice C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the shunting is to convey the high-viscosity PET melt to the distribution hole A and the distribution hole B through the spinning beam I, and simultaneously convey the low-viscosity PET melt to the distribution hole C through the spinning beam II.
According to the preparation method of the PET two-component elastic yarns with different viscosities, the intrinsic viscosity of the high-viscosity PET melt is 0.70-0.75 dL/g, the temperature of the spinning box I is 284-286 ℃, the intrinsic viscosity of the low-viscosity PET melt is 0.50-0.55 dL/g, the temperature of the spinning box II is 270-275 ℃, and the temperature of the spinning box III is 278-283 ℃ (the temperature of the spinning box III is the spinning temperature). In order to ensure smooth spinning, it is necessary to ensure that the two components have the same flow state when extruded from the same spinneret orifice, i.e. the apparent viscosities of the melts are close (for the same polymer, the greater the apparent viscosity, the poorer the flow property); the invention reasonably sets the temperature of the spinning manifold I, the spinning manifold II and the spinning manifold III to ensure that the temperature can be matched with the intrinsic viscosity of the high-viscosity PET melt and the intrinsic viscosity of the low-viscosity PET melt, the high-viscosity PET adopts high-temperature melting and low-temperature spinning, the low-viscosity PET adopts low-temperature melting and high-temperature spinning, thus the degradation of the low-viscosity PET can be reduced, although the temperature difference of the two components in the manifold is larger, the two components enter the same composite component to exchange heat, the temperature of the high-viscosity PET component is reduced, the temperature of the low-viscosity PET component is increased, the apparent viscosities of the two components are extruded from a spinneret orifice to be approximately consistent, and the smooth running of the spinning can be ensured.
The invention also provides the PET double-component elastic yarn with different viscosities, which is prepared by the preparation method of the PET double-component elastic yarn with different viscosities, and consists of high-viscosity PET monofilaments and high-viscosity PET/low-viscosity PET parallel composite monofilaments; the curling directions of the monofilaments in the PET bicomponent elastic yarns with different viscosities are randomly distributed, and the random distribution is a mathematical concept, namely the curling form of each fiber is different from that of other fibers, so that the prepared fabric has no strip-shaped uneven shape.
As a preferred technical scheme:
according to the PET two-component elastic yarn with different viscosities, the PET two-component elastic yarn with different viscosities has the crimping shrinkage rate of 50-53%, the crimping stability of 85-87%, the contraction elongation of 93-98% and the crimping elastic recovery rate of 95-96%.
The PET bicomponent elastic yarn with different viscosities has the breaking strength of more than or equal to 2.9cN/dtex, the elongation at break of 43.0 +/-5.0 percent and the total fineness of 100-200 dtex.
Preparing the prepared PET double-component elastic yarns with different viscosities into a knitted fabric, and testing the uneven strip shade condition of the knitted fabric, wherein the testing process comprises the following steps: firstly, acquiring a knitted fabric image, converting the knitted fabric image into a gray image, then performing first processing and second processing on the gray image, and calculating a parameter D, and representing the uneven degree of the strip shadow shape by using the parameter D, wherein the gray image comprises a strip shadow area, a high gray value area of a non-strip shadow area and a low gray value area of the non-strip shadow area; the first processing is to change the pixel points of the high gray value area of the non-strip shadow area in the gray image into pure white points; the second processing is to change the pixel points of the low gray value area of the non-shadow area in the gray image into pure white points; the calculation formula of the parameter D is as follows: d ═ Σ B/a, where Σ B represents the number of pixels having a gray scale value of 0 in the grayscale image, and a represents the total number of pixels in the grayscale image.
If the D value is more than or equal to 3%, the strip shade unevenness can be judged to appear, and if the D value is more than or equal to 10%, the strip shade unevenness can be judged to appear seriously. The test result of the knitted fabric made of the PET bicomponent elastic yarn with different viscosities is as follows: d value of the knitted fabric made of PET double-component elastic yarns with different viscosities is less than or equal to 1.0 percent; this indicates that the knitted fabric made of PET bicomponent elastic yarns having different viscosities does not have the problem of "uneven stripe shape".
Has the advantages that:
(1) according to the preparation method of the PET two-component elastic yarn with different viscosities, the PET two-component elastic yarn with different viscosities is composed of the high-viscosity PET fibers and the high-viscosity PET/low-viscosity PET side-by-side composite fibers, and the spiral crimp state of a single fiber in a multifilament is changed after relaxation heat treatment, so that the crimp state of each fiber is different from that of other fibers;
(2) the preparation method of the PET two-component elastic yarn with different viscosities effectively solves the problem of uneven strip shade formed by high-viscosity PET/low-viscosity PET parallel composite fibers in knitted fabrics;
(3) the PET double-component elastic yarn with different viscosities is environment-friendly and economical in circulation, good in comprehensive performance and wide in application field.
Drawings
FIG. 1 is a schematic view of the distribution of the melt of the present invention, wherein A, B and C are independent distribution holes and D and E are independent guide holes.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The crimp shrinkage and crimp stability of the invention are obtained by testing the tow in GB6506-2001 synthetic fiber textured yarn crimp performance test method;
the method for testing the shrinkage elongation (reflecting the elasticity and the crimp degree of the deformed filament, the fiber is firstly loaded under light load and then loaded under heavy load, and the ratio of the length difference value under the two loads to the crimp length) and the crimp elastic recovery rate is as follows:
firstly, cutting two fiber samples with the length of about 50cm, putting the two fiber samples into hot water with the temperature of 100 ℃ for treatment for 30min, taking out the two fiber samples, naturally drying the two fiber samples, then cutting the sample with the length of about 30cm, fixing one end of the sample, loading a load of 0.0018cN/dtex on the other end of the sample, continuing for 30s, marking the sample at the position of 20cm, and obtaining the initial length l of the sample1(ii) a Then, a load of 0.09cN/dtex was loaded instead, for 30s, the position of the marker point was measured,i.e. length l of the specimen when it 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
The preparation method of the PET two-component elastic yarn with different viscosities comprises the following steps:
(1) extruding PET double-component elastic yarns with different viscosities on the same spinneret plate;
the high viscosity PET melt (intrinsic viscosity 0.75dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the low-viscosity PET melt (the intrinsic viscosity is 0.5dL/g) in a parallel composite spinning mode;
the number ratio of the circular spinneret orifices m through which the flow is directly extruded to the circular spinneret orifices n through which the flow is extruded after being distributed in the parallel composite spinning mode is 1: 8; the mass ratio of the high-viscosity PET melt passing through the spinneret orifice n to the low-viscosity PET melt is 50:50, and the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1;
all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
as shown in fig. 1, the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the shunting is to convey the high-viscosity PET melt to a distribution hole A and a distribution hole B through a spinning manifold I, and simultaneously convey the low-viscosity PET melt to a distribution hole C through a spinning manifold II; the temperature of the spinning manifold I is 286 ℃, the temperature of the spinning manifold II is 275 ℃, and the temperature of the spinning manifold III is 283 ℃;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET double-component elastic yarns with different viscosities;
the parameters of the FDY process are as follows: the cooling temperature is 25 ℃, the network pressure is 0.2MPa, the one-roll speed is 2300m/min, the one-roll temperature is 85 ℃, the two-roll speed is 3560m/min, the two-roll temperature is 150 ℃, and the winding speed is 3460 m/min; the temperature of the relaxation heat treatment is 104 ℃, and the time is 30 min;
the prepared PET double-component elastic yarn with different viscosities is composed of high-viscosity PET monofilaments and high-viscosity PET/low-viscosity PET parallel composite monofilaments; the single filaments in the PET double-component elastic yarns with different viscosities are randomly distributed in the curling direction; the PET bicomponent elastic yarn with different viscosities has the crimping shrinkage rate of 53 percent, the crimping stability of 87 percent, the contraction elongation of 98 percent and the crimping elastic recovery rate of 96 percent; the PET bicomponent elastic yarns with different viscosities have the breaking strength of 3.1cN/dtex, the elongation at break of 45 percent and the total fineness of 130 dtex. The PET two-component elastic yarns with different viscosities are made into knitted fabrics, the condition of uneven stripe shade of the knitted fabrics is tested, and the D value of the knitted fabrics is 0.51.
Example 2
The preparation method of the PET two-component elastic yarn with different viscosities comprises the following steps:
(1) extruding PET double-component elastic yarns with different viscosities on the same spinneret plate;
the high-viscosity PET melt (intrinsic viscosity 0.73dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the low-viscosity PET melt (the intrinsic viscosity is 0.54dL/g) in a parallel composite spinning mode;
the number ratio of the oval spinneret orifices m which directly extrude and flow through to the round spinneret orifices n which extrude and flow through after being distributed in the parallel composite spinning mode is 1: 6; the mass ratio of the high-viscosity PET melt passing through the spinneret orifice n to the low-viscosity PET melt is 50:50, and the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1;
all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the shunting is to convey the high-viscosity PET melt to a distribution hole A and a distribution hole B through a spinning manifold I, and simultaneously convey the low-viscosity PET melt to a distribution hole C through a spinning manifold II; the temperature of the spinning manifold I is 282 ℃, the temperature of the spinning manifold II is 271 ℃, and the temperature of the spinning manifold III is 278 ℃;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET double-component elastic yarns with different viscosities;
the parameters of the FDY process are as follows: the cooling temperature is 20 ℃, the network pressure is 0.25MPa, the first-roller speed is 2350m/min, the first-roller temperature is 95 ℃, the second-roller speed is 3660m/min, the second-roller temperature is 160 ℃, and the winding speed is 3530 m/min; the temperature of the relaxation heat treatment is 103 ℃, and the time is 28 min;
the prepared PET double-component elastic yarn with different viscosities is composed of high-viscosity PET monofilaments and high-viscosity PET/low-viscosity PET parallel composite monofilaments; the single filaments in the PET double-component elastic yarns with different viscosities are randomly distributed in the curling direction; the PET bicomponent elastic yarn with different viscosities has the crimp shrinkage rate of 52.8 percent, the crimp stability of 85 percent, the shrinkage elongation of 95 percent and the crimp elastic recovery rate of 95.4 percent; the PET bicomponent elastic yarns with different viscosities have the breaking strength of 3.1cN/dtex, the elongation at break of 44.2 percent and the total titer of 115 dtex. The PET two-component elastic yarns with different viscosities are made into knitted fabrics, the uneven condition of the stripe shade of the knitted fabrics is tested, and the D value of the knitted fabrics is 0.39.
Example 3
The preparation method of the PET two-component elastic yarn with different viscosities comprises the following steps:
(1) extruding PET double-component elastic yarns with different viscosities on the same spinneret plate;
the high-viscosity PET melt (intrinsic viscosity 0.73dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the low-viscosity PET melt (the intrinsic viscosity is 0.55dL/g) in a parallel composite spinning mode;
the number ratio of the triangular spinneret orifices m which directly extrude and flow through to the circular spinneret orifices n which extrude and flow through after being distributed in the parallel composite spinning mode is 1: 8; the mass ratio of the high-viscosity PET melt passing through the spinneret orifice n to the low-viscosity PET melt is 50:50, and the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1;
all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the shunting is to convey the high-viscosity PET melt to a distribution hole A and a distribution hole B through a spinning manifold I, and simultaneously convey the low-viscosity PET melt to a distribution hole C through a spinning manifold II; the temperature of the spinning beam I is 283 ℃, the temperature of the spinning beam II is 275 ℃, and the temperature of the spinning beam III is 279 ℃;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET double-component elastic yarns with different viscosities;
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 2300m/min, the one-roller temperature is 86 ℃, the two-roller speed is 3500m/min, the two-roller temperature is 151 ℃, and the winding speed is 3430 m/min; the temperature of the relaxation heat treatment is 120 ℃, and the time is 29 min;
the prepared PET double-component elastic yarn with different viscosities is composed of high-viscosity PET monofilaments and high-viscosity PET/low-viscosity PET parallel composite monofilaments; the single filaments in the PET double-component elastic yarns with different viscosities are randomly distributed in the curling direction; the PET bicomponent elastic yarn with different viscosities has the crimping shrinkage rate of 52 percent, the crimping stability of 85.5 percent, the shrinkage elongation of 96 percent and the crimp elastic recovery rate of 95.1 percent; the PET bicomponent elastic yarns with different viscosities have the breaking strength of 3cN/dtex, the elongation at break of 46 percent and the total titer of 125 dtex. The PET two-component elastic yarns with different viscosities are made into knitted fabrics, the uneven condition of the stripe shade of the knitted fabrics is tested, and the D value of the knitted fabrics is 0.68.
Example 4
The preparation method of the PET two-component elastic yarn with different viscosities comprises the following steps:
(1) extruding PET double-component elastic yarns with different viscosities on the same spinneret plate;
the high-viscosity PET melt (intrinsic viscosity 0.7dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the low-viscosity PET melt (the intrinsic viscosity is 0.53dL/g) in a parallel composite spinning mode;
the number ratio of the Y-shaped spinneret orifices m directly extruding and flowing through to the circular spinneret orifices n extruding and flowing through after being distributed in the parallel composite spinning mode is 1: 6; the mass ratio of the high-viscosity PET melt passing through the spinneret orifice n to the low-viscosity PET melt is 50:50, and the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1;
all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the shunting is to convey the high-viscosity PET melt to a distribution hole A and a distribution hole B through a spinning manifold I, and simultaneously convey the low-viscosity PET melt to a distribution hole C through a spinning manifold 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 280 ℃;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET double-component elastic yarns with different viscosities;
the parameters of the FDY process are as follows: the cooling temperature is 23 ℃, the network pressure is 0.24MPa, the first-roller speed is 2250m/min, the first-roller temperature is 90 ℃, the second-roller speed is 3700m/min, the second-roller temperature is 152 ℃, and the winding speed is 3610 m/min; the temperature of the relaxation heat treatment is 90 ℃ and the time is 24 min;
the prepared PET double-component elastic yarn with different viscosities is composed of high-viscosity PET monofilaments and high-viscosity PET/low-viscosity PET parallel composite monofilaments; the single filaments in the PET double-component elastic yarns with different viscosities are randomly distributed in the curling direction; the PET bicomponent elastic yarn with different viscosities has the crimp shrinkage rate of 52.5 percent, the crimp stability of 85.3 percent, the shrinkage elongation of 97.7 percent and the crimp elastic recovery rate of 95.5 percent; the PET bicomponent elastic yarns with different viscosities have the breaking strength of 3.3cN/dtex, the elongation at break of 40.5 percent and the total titer of 105 dtex. The PET two-component elastic yarns with different viscosities are made into knitted fabrics, the uneven condition of the stripe shade of the knitted fabrics is tested, and the D value of the knitted fabrics is 0.72.
Example 5
The preparation method of the PET two-component elastic yarn with different viscosities comprises the following steps:
(1) extruding PET double-component elastic yarns with different viscosities on the same spinneret plate;
the high-viscosity PET melt (intrinsic viscosity 0.74dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the low-viscosity PET melt (the intrinsic viscosity is 0.53dL/g) in a parallel composite spinning mode;
the number ratio of the cross spinneret orifices m for direct extrusion flowing to the oval spinneret orifices n for extrusion flowing after being distributed in the parallel composite spinning mode is 1: 7; the mass ratio of the high-viscosity PET melt passing through the spinneret orifice n to the low-viscosity PET melt is 50:50, and the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1;
all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the shunting is to convey the high-viscosity PET melt to a distribution hole A and a distribution hole B through a spinning manifold I, and simultaneously convey the low-viscosity PET melt to a distribution hole C through a spinning manifold II; the temperature of the spinning box I is 286 ℃, the temperature of the spinning box II is 272 ℃, and the temperature of the spinning box III is 280 ℃;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET double-component elastic yarns with different viscosities;
the parameters of the FDY process are as follows: the cooling temperature is 24 ℃, the network pressure is 0.28MPa, the one-roller speed is 2265m/min, the one-roller temperature is 87 ℃, the two-roller speed is 3580m/min, the two-roller temperature is 152 ℃, and the winding speed is 3460 m/min; the temperature of the relaxation heat treatment is 105 ℃, and the time is 25 min;
the prepared PET double-component elastic yarn with different viscosities is composed of high-viscosity PET monofilaments and high-viscosity PET/low-viscosity PET parallel composite monofilaments; the single filaments in the PET double-component elastic yarns with different viscosities are randomly distributed in the curling direction; the PET bicomponent elastic yarn with different viscosities has the crimp shrinkage rate of 51.6 percent, the crimp stability of 85.2 percent, the shrinkage elongation of 94 percent and the crimp elastic recovery rate of 95.8 percent; the PET bicomponent elastic yarns with different viscosities have the breaking strength of 3.4cN/dtex, the elongation at break of 38 percent and the total titer of 100 dtex. The PET two-component elastic yarns with different viscosities are made into knitted fabrics, the condition of uneven stripe shade of the knitted fabrics is tested, and the D value of the knitted fabrics is 0.33.
Example 6
The preparation method of the PET two-component elastic yarn with different viscosities comprises the following steps:
(1) extruding PET double-component elastic yarns with different viscosities on the same spinneret plate;
the high-viscosity PET melt (intrinsic viscosity 0.72dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the low-viscosity PET melt (the intrinsic viscosity is 0.54dL/g) in a parallel composite spinning mode;
the number ratio of the 8-shaped spinneret orifices m which directly extrude and flow through to the oval spinneret orifices n which extrude and flow through after being distributed in the parallel composite spinning mode is 1: 6; the mass ratio of the high-viscosity PET melt passing through the spinneret orifice n to the low-viscosity PET melt is 50:50, and the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1;
all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the shunting is to convey the high-viscosity PET melt to a distribution hole A and a distribution hole B through a spinning manifold I, and simultaneously convey the low-viscosity PET melt to a distribution hole C through a spinning manifold II; the temperature of the spinning beam I is 284 ℃, the temperature of the spinning beam II is 271 ℃, and the temperature of the spinning beam III is 279 ℃;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET double-component elastic yarns with different viscosities;
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 2200m/min, the one-roll temperature is 85 ℃, the two-roll speed is 3700m/min, the two-roll temperature is 150 ℃, and the winding speed is 3610 m/min; the temperature of the relaxation heat treatment is 104 ℃, and the time is 20 min;
the prepared PET double-component elastic yarn with different viscosities is composed of high-viscosity PET monofilaments and high-viscosity PET/low-viscosity PET parallel composite monofilaments; the single filaments in the PET double-component elastic yarns with different viscosities are randomly distributed in the curling direction; the PET bicomponent elastic yarn with different viscosities has the crimping shrinkage rate of 50%, the crimping stability of 85%, the shrinkage elongation of 93% and the crimping elastic recovery rate of 95%; the PET bicomponent elastic yarns with different viscosities have the breaking strength of 3.3cN/dtex, the elongation at break of 41 percent and the total fineness of 105 dtex. The PET two-component elastic yarns with different viscosities are made into knitted fabrics, the condition of uneven stripe shade of the knitted fabrics is tested, and the D value of the knitted fabrics is 0.52.
Example 7
The preparation method of the PET two-component elastic yarn with different viscosities comprises the following steps:
(1) extruding PET double-component elastic yarns with different viscosities on the same spinneret plate;
the high-viscosity PET melt (intrinsic viscosity 0.72dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the low-viscosity PET melt (the intrinsic viscosity is 0.5dL/g) in a parallel composite spinning mode;
the number ratio of the rectangular spinneret orifices m through which the direct extrusion flows to the 8-shaped spinneret orifices n through which the extrusion flows after being distributed in the parallel composite spinning mode is 1: 6; the mass ratio of the high-viscosity PET melt passing through the spinneret orifice n to the low-viscosity PET melt is 50:50, and the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1;
all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the shunting is to convey the high-viscosity PET melt to a distribution hole A and a distribution hole B through a spinning manifold I, and simultaneously convey the low-viscosity PET melt to a distribution hole C through a spinning manifold II; the temperature of the spinning manifold I is 285 ℃, the temperature of the spinning manifold II is 271 ℃, and the temperature of the spinning manifold III is 278 ℃;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET double-component elastic yarns with different viscosities;
the parameters of the FDY process are as follows: the cooling temperature is 24 ℃, the network pressure is 0.22MPa, the first-roller speed is 2400m/min, the first-roller temperature is 88 ℃, the second-roller speed is 3550m/min, the second-roller temperature is 154 ℃, and the winding speed is 3480 m/min; the temperature of the relaxation heat treatment is 114 ℃, and the time is 23 min;
the prepared PET double-component elastic yarn with different viscosities is composed of high-viscosity PET monofilaments and high-viscosity PET/low-viscosity PET parallel composite monofilaments; the single filaments in the PET double-component elastic yarns with different viscosities are randomly distributed in the curling direction; the PET bicomponent elastic yarn with different viscosities has the crimp shrinkage rate of 52 percent, the crimp stability of 86 percent, the shrinkage elongation of 96 percent and the crimp elastic recovery rate of 95.3 percent; the PET bicomponent elastic yarns with different viscosities have the breaking strength of 2.9cN/dtex, the elongation at break of 48 percent and the total titer of 116 dtex. The PET two-component elastic yarns with different viscosities are made into knitted fabrics, the uneven condition of the stripe shade of the knitted fabrics is tested, and the D value of the knitted fabrics is 0.25.
Example 8
The preparation method of the PET two-component elastic yarn with different viscosities comprises the following steps:
(1) extruding PET double-component elastic yarns with different viscosities on the same spinneret plate;
the high viscosity PET melt (intrinsic viscosity 0.75dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the low-viscosity PET melt (the intrinsic viscosity is 0.51dL/g) in a parallel composite spinning mode;
the number ratio of the linear spinneret orifices m which directly extrude and flow through to the 8-shaped spinneret orifices n which extrude and flow through after being distributed in the parallel composite spinning mode is 1: 6; the mass ratio of the high-viscosity PET melt passing through the spinneret orifice n to the low-viscosity PET melt is 50:50, and the ratio of the equivalent diameter of the spinneret orifice m to the equivalent diameter of the spinneret orifice n is 1: 1;
all the spinneret orifices are distributed in concentric circles, the spinneret orifices on the same circle are m or n, and the spinneret orifices on the circle at the outermost circle are n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole D, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the shunting is to convey the high-viscosity PET melt to a distribution hole A and a distribution hole B through a spinning manifold I, and simultaneously convey the low-viscosity PET melt to a distribution hole C through a spinning manifold II; the temperature of the spinning manifold I is 286 ℃, the temperature of the spinning manifold II is 273 ℃, and the temperature of the spinning manifold III is 278 ℃;
(2) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain PET double-component elastic yarns with different viscosities;
the parameters of the FDY process are as follows: the cooling temperature is 20 ℃, the network pressure is 0.27MPa, the first-roller speed is 2380m/min, the first-roller temperature is 89 ℃, the second-roller speed is 3600m/min, the second-roller temperature is 156 ℃, and the winding speed is 3520 m/min; the temperature of the relaxation heat treatment is 101 ℃, and the time is 29 min;
the prepared PET double-component elastic yarn with different viscosities is composed of high-viscosity PET monofilaments and high-viscosity PET/low-viscosity PET parallel composite monofilaments; the single filaments in the PET double-component elastic yarns with different viscosities are randomly distributed in the curling direction; the PET bicomponent elastic yarn with different viscosities has the crimping shrinkage rate of 52.7 percent, the crimping stability of 85.8 percent, the shrinkage elongation of 94 percent and the crimp elastic recovery rate of 95.1 percent; the PET bicomponent elastic yarns with different viscosities have the breaking strength of 3.2cN/dtex, the elongation at break of 43.5 percent and the total titer of 200 dtex. The PET two-component elastic yarns with different viscosities are made into knitted fabrics, the condition of uneven stripe shade of the knitted fabrics is tested, and the D value of the knitted fabrics is 0.67.
Claims (10)
1. The preparation method of the PET double-component elastic yarn with different viscosities is characterized by comprising the following steps: extruding PET double-component elastic yarns with different viscosities on the same spinneret plate;
splitting the high-viscosity PET melt into two paths: one path is directly extruded after being distributed; the other path of the melt is distributed together with the low-viscosity PET melt according to a parallel composite spinning mode and then extruded;
the number ratio of the spinneret orifices m for directly extruding flow to the spinneret orifices n for extruding flow after being distributed in the parallel composite spinning mode is 1: 6-8;
and (3) preparing FDY yarns according to an FDY process after extrusion, and performing relaxation heat treatment to obtain the PET double-component elastic yarns with different viscosities.
2. The method for preparing PET bicomponent elastic yarn with different viscosities as claimed in claim 1, wherein the mass ratio of the high viscosity PET melt to the low viscosity PET melt passing through the spinneret n is 50:50, and the ratio of the equivalent diameter of the spinneret m to the equivalent diameter of the spinneret n is 1: 1.
3. The method for preparing PET bicomponent elastic yarn with different viscosities as claimed in claim 1, wherein the spinneret holes m are circular, oval, triangular, Y-shaped, cross-shaped, "8" -shaped, rectangular or in-line shaped spinneret holes, and the spinneret holes n are circular, oval or "8" -shaped spinneret holes.
4. The method for preparing PET bicomponent elastic yarn with different viscosities as claimed in claim 1, wherein all the spinneret holes are distributed in concentric circles, the spinneret holes on the same circle are all m or all n, and the spinneret holes on the outermost circle are all n.
5. The method for preparing PET bicomponent elastic yarns with different viscosities according to claim 1, wherein the parameters of the FDY process are as follows: the cooling temperature is 20-25 ℃, the network pressure is 0.20-0.30 MPa, the first roller speed is 2200-2400 m/min, the first roller temperature is 85-95 ℃, the second roller speed is 3500-3700 m/min, the second roller temperature is 150-160 ℃, and the winding speed is 3430-3610 m/min; the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
6. The method for preparing PET bicomponent elastic yarn with different viscosities as claimed in claim 5, 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 D, a transition hole and a capillary hole which are connected in sequence, the guide hole E is connected with the distribution hole A, and the guide hole D is simultaneously connected with the distribution hole B and the distribution hole C; the distribution hole A, the distribution hole B and the distribution hole C are positioned on a distribution plate in the spinning beam III; the shunting is to convey the high-viscosity PET melt to the distribution hole A and the distribution hole B through the spinning beam I, and simultaneously convey the low-viscosity PET melt to the distribution hole C through the spinning beam II.
7. The method for preparing PET bicomponent elastic yarns with different viscosities as claimed in claim 6, wherein the intrinsic viscosity of the high-viscosity PET melt is 0.70-0.75 dL/g, the temperature of a spinning beam I is 284-286 ℃, the intrinsic viscosity of the low-viscosity PET melt is 0.50-0.55 dL/g, the temperature of a spinning beam II is 270-275 ℃, and the temperature of a spinning beam III is 278-283 ℃.
8. The PET bicomponent elastic yarn with different viscosities, which is prepared by the preparation method of the PET bicomponent elastic yarn with different viscosities as claimed in any one of claims 1 to 7, is characterized in that: consists of high-viscosity PET monofilament and high-viscosity PET/low-viscosity PET parallel composite monofilament; the single filaments in the PET double-component elastic yarns with different viscosities are randomly distributed in the curling direction.
9. The PET bicomponent elastic yarn with different viscosities as claimed in claim 8, wherein the PET bicomponent elastic yarn with different viscosities has a crimp shrinkage of 50-53%, a crimp stability of 85-87%, a shrinkage elongation of 93-98%, and a crimp elastic recovery of 95-96%.
10. The PET bicomponent elastic yarn with different viscosities as claimed in claim 8, wherein the PET bicomponent elastic yarn with different viscosities has a breaking strength of not less than 2.9cN/dtex, an elongation at break of 43.0 ± 5.0%, and a total fineness of 100-200 dtex.
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| CN201911351589.9A CN111041578B (en) | 2019-12-24 | 2019-12-24 | PET (polyethylene terephthalate) double-component elastic yarn with different viscosities and preparation method thereof |
| PCT/CN2020/095508 WO2021128753A1 (en) | 2019-12-24 | 2020-06-11 | Pet bi-component elastic yarn having different viscosities and preparation method therefor |
| JP2022535676A JP7255028B2 (en) | 2019-12-24 | 2020-06-11 | Bicomponent elastic yarn based on PET with different viscosities and its production method |
| EP20905706.6A EP4083280A1 (en) | 2019-12-24 | 2020-06-11 | Pet bi-component elastic yarn having different viscosities and preparation method therefor |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP7255028B2 (en) | 2023-04-10 |
| CN111041578B (en) | 2022-03-18 |
| JP2022553112A (en) | 2022-12-21 |
| EP4083280A1 (en) | 2022-11-02 |
| WO2021128753A1 (en) | 2021-07-01 |
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