CN111118663B - PBT/PTT double-component elastic yarn and preparation method thereof - Google Patents

PBT/PTT double-component elastic yarn and preparation method thereof Download PDF

Info

Publication number
CN111118663B
CN111118663B CN201911350180.5A CN201911350180A CN111118663B CN 111118663 B CN111118663 B CN 111118663B CN 201911350180 A CN201911350180 A CN 201911350180A CN 111118663 B CN111118663 B CN 111118663B
Authority
CN
China
Prior art keywords
pbt
ptt
spinneret
double
component elastic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201911350180.5A
Other languages
Chinese (zh)
Other versions
CN111118663A (en
Inventor
汤方明
范红卫
孙晓华
王山水
王丽丽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Hengli Chemical Fiber Co Ltd
Original Assignee
Jiangsu Hengli Chemical Fiber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Hengli Chemical Fiber Co Ltd filed Critical Jiangsu Hengli Chemical Fiber Co Ltd
Priority to CN201911350180.5A priority Critical patent/CN111118663B/en
Publication of CN111118663A publication Critical patent/CN111118663A/en
Application granted granted Critical
Publication of CN111118663B publication Critical patent/CN111118663B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/22—Formation of filaments, threads, or the like with a crimped or curled structure; with a special structure to simulate wool
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
    • D01D5/30—Conjugate filaments; Spinnerette packs therefor
    • D01D5/32—Side-by-side structure; Spinnerette packs therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Multicomponent Fibers (AREA)

Abstract

The invention relates to a PBT/PTT double-component elastic yarn and a preparation method thereof, wherein the PBT/PTT double-component elastic yarn is extruded on the same spinneret plate; the PBT melt is divided into two paths: one path is directly extruded after being distributed; the other path is distributed together with the PTT melt according to a parallel composite spinning mode and then extruded; the number ratio of the spinneret orifices m of the direct extrusion flow to the spinneret orifices n of the extrusion flow after being distributed in the parallel composite spinning mode is 1:5-7; preparing PBT/PTT double-component elastic yarns according to a POY-DTY process after extrusion; the prepared PBT/PTT double-component elastic yarn mainly comprises a PBT monofilament and a PBT/PTT parallel composite monofilament; the single-filament curling directions of the PBT/PTT double-component elastic filaments are randomly distributed. The method effectively solves the problem of uneven strip shade formed by the PBT/PTT parallel composite fibers in the knitted fabric.

Description

PBT/PTT double-component elastic yarn and preparation method thereof
Technical Field
The invention belongs to the technical field of polyester fibers, and relates to a PBT/PTT double-component elastic yarn and a preparation method thereof.
Background
Crimp is an important indicator of fiber, affecting textile processing and final end product characteristics and application properties.
In the family of the bicomponent composite fiber, the side-by-side bicomponent composite fiber is an important member, and the fiber is bent deviating from the axial direction of the fiber by utilizing the difference of the heat shrinkage performance of the two components, so that the fiber presents permanent three-dimensional spiral crimp, and the crimp similar to wool fiber is obtained. The fiber is crimped without deformation processing carried out when common thermoplastic fibers are crimped, so that the thermal damage of chemical fibers is avoided, the fiber is generally called self-crimped fiber and also called three-dimensional crimped fiber, the crimp has the characteristics of durability, stability, good elasticity and the like, and the fabric can be endowed with better elasticity, bulkiness and coverage.
Crimped fibers have been widely used in clothing, but due to the singleness of the fabric structure and the degree of fiber crimp, there is still no good solution for thick (knitted) fabrics, children's underwear, etc. when there is a greater need for warmth retention and shape retention.
In the prior art, the three-dimensional spiral crimping of the two-component composite fiber can be straightened under the stretching action of external force, and can be well restored to the initial crimping form when the external force action is removed. Due to the difference of fiber inclination state and mechanical response behavior, when the double-component composite fiber is used for weaving knitted 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 striped shape, are found in apparent view. The problem causes that the double-component composite fiber can not be applied to a plurality of knitting products, and the development and application of the double-component composite fiber knitted fabric are seriously restricted.
Therefore, it is of great importance to develop a bicomponent composite fiber for knitted fabrics which avoids the occurrence of random strip shade unevenness and a preparation method thereof.
Disclosure of Invention
The invention provides a PBT/PTT double-component elastic yarn and a preparation method thereof, and aims to enable the PBT/PTT double-component elastic yarn to be sleeved with a large ring and a small ring through DTY and self-curling double bending effects, so that the PBT/PTT double-component elastic yarn is more abundant in curling and more fluffy in fiber, and is more beneficial to air storage so as to achieve a better heat preservation effect; the second purpose is to solve the problem of uneven strip shade of randomness when the double-component composite fiber is applied to a knitted fabric product in the prior art. The PBT/PTT double-component elastic yarn is formed by the PBT monofilament and the PBT/PTT parallel composite monofilament, so that the problem that a knitted fabric made of the PBT/PTT parallel composite fiber has uneven strip shade is solved.
In order to achieve the purpose, the invention adopts the following scheme:
the preparation method of the PBT/PTT double-component elastic yarn comprises the steps of extruding the PBT/PTT double-component elastic yarn on the same spinneret plate;
the PBT melt is divided into two paths: one path is directly extruded after being distributed; the other path of the PTT melt is distributed and extruded together with the PTT melt in a parallel composite spinning mode;
the number ratio of the spinneret orifices m of the direct extrusion flow to the spinneret orifices n of the extrusion flow after being distributed in the parallel composite spinning mode is 1:5-7;
and (3) preparing the PBT/PTT double-component elastic yarn according to a POY-DTY process after extrusion.
Specifically, the PBT melt is divided into two paths, one path is directly extruded after being distributed, the other path and the PTT melt are distributed together in a parallel composite spinning mode and then extruded, so that the replacement is realized, and correspondingly, the number and the position relation of the distribution holes and the guide holes are reasonably set 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 stripe shape, but also maintaining the excellent performance of the PBT/PTT parallel composite fiber; the invention distributes the spinneret orifices m and the spinneret orifices n according to the concentric circles, and controls the spinneret orifices m to be positioned at the inner ring of the concentric circles as much as possible, thereby ensuring that the PBT fiber can be fully doped into the PBT/PTT parallel composite fiber and playing the role of breaking the pure PBT/PTT parallel composite fiber to form a neat left and right spiral shape; the invention ensures that the apparent viscosities of the PTT component and the PBT component extruded from the spinneret hole are relatively close by selecting the PBT melt with the intrinsic viscosity of 0.92-1.05 dL/g and the PTT melt with the intrinsic viscosity of 1.00-1.10 dL/g and reasonably setting the spinning box III temperature, the PBT melt spinning box I temperature and the PTT melt spinning box II temperature, thereby ensuring the smooth spinning; 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 POY-DT process, so that the product has high crimp shrinkage, crimp stability, shrinkage elongation and crimp elastic recovery rate, and good mechanical properties.
The principle of the invention is as follows:
the PBT/PTT double-component elastic filament consists of the PBT monofilament and the PBT/PTT parallel composite monofilament, the PBT/PTT parallel composite monofilament is a three-dimensional crimped fiber, and the PBT monofilament does not curl, and the PBT/PTT double-component elastic filament consisting of the PBT monofilament and the PBT/PTT parallel composite monofilament is equivalent to replacing part of the PBT/PTT parallel composite monofilament with part of the PBT monofilament, so that the neat left and right spiral forms of the PBT/PTT double-component fiber are broken; in the same bundle of PBT/PTT bi-component elastic filament, the ratio of the number of PBT monofilaments (corresponding to the spinneret holes m) to the number of PBT/PTT parallel composite monofilaments (corresponding to the spinneret holes n) is 1:5-7, the PBT monofilaments have the function of breaking and forming tidy left and right spiral shapes, the PBT/PTT parallel composite monofilaments have the function of providing elasticity for the PBT/PTT bi-component elastic filament through self-curling, too many PBT monofilaments can not well reflect the performance of the composite filament, and too few PBT monofilaments can not play a role of breaking and forming tidy left and right spiral shapes, the PBT monofilaments and the PBT/PTT parallel composite monofilaments are mixed according to a specific ratio, so that the elasticity of the PBT/PTT bi-component elastic filament is ensured, the tidy left and right spiral shapes formed by the PBT/PTT parallel composite monofilaments are broken, the curling shape of each PBT/PTT parallel composite monofilament is different from other fibers, and further the uneven strip shade is eliminated.
The PBT/PTT double-component elastic yarn is spirally curled in a three-dimensional manner in the longitudinal direction, the three-dimensional curling enables the fabric to have good fluffiness, elasticity and extensibility, the initial modulus of the PBT and the PTT is low, and the large ring and the small ring of the PBT/PTT double-component elastic yarn are sleeved by the POY-DTY process and the self-curling dual-bending effect, so that the curling is rich, the fiber is fluffy, and the air storage is facilitated to achieve a better heat preservation effect; meanwhile, the irregular spiral crimp can lead the fabric to have good moisture-conducting performance.
As a preferred technical scheme:
according to the preparation method of the PBT/PTT bicomponent elastic yarn, the mass ratio of the PBT melt passing through the spinneret orifice n to the PTT melt is 50.
According to the preparation method of the PBT/PTT bicomponent elastic yarn, the spinneret holes m are circular, oval, triangular, Y-shaped, cross-shaped, 8-shaped, rectangular or in-line spinneret holes, and the spinneret holes n are circular, oval or 8-shaped spinneret holes.
According to the preparation method of the PBT/PTT bicomponent elastic yarn, 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 PBT monofilament is mixed into the middle of the PBT/PTT parallel composite monofilament, and the effect of forming a neat left and right spiral shape is achieved; otherwise, more PBT monofilaments are distributed at the outermost circle, so that the internal PBT/PTT parallel composite monofilaments still have regular left and right spiral shapes.
According to the preparation method of the PBT/PTT double-component elastic yarn, the parameters of the POY process are as follows: the spinning temperature is 276-280 ℃, the cooling temperature is 20-25 ℃, the network pressure is 0.20-0.30 MPa, and the winding speed is 2800-3500 m/min; the parameters of the DTY process are as follows: spinning speed 400-800 m/min, setting overfeed rate 3.5-5.5%, winding overfeed rate 2.5-5.0%, first hot box temperature 150-220 deg.c, second hot box temperature 100-180 deg.c, stretching multiple 1.5-1.9, D/Y value (the D/Y value is the ratio of the peripheral speed of the friction disc to the yarn speed of the yarn leaving the false twister and is selected based on the total fineness and tension ratio of the yarn) 1.7-2.2, and network pressure 0.05-0.3 MPa.
According to the preparation method of the PBT/PTT bicomponent elastic yarn, 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; and the flow splitting is to convey the PBT melt to the distribution hole A and the distribution hole B through the spinning beam I, and simultaneously convey the PTT melt to the distribution hole C through the spinning beam II.
According to the preparation method of the PBT/PTT two-component elastic yarn, the intrinsic viscosity of a PBT melt is 0.92-1.05 dL/g, the temperature of a spinning box I is 268-272 ℃, the intrinsic viscosity of a PTT melt is 1.00-1.10 dL/g, the temperature of a spinning box II is 272-277 ℃, and the temperature of a spinning box III is 276-280 ℃ (the temperature of the spinning box III is the spinning temperature). In order to ensure smooth spinning, it is necessary to ensure that the two components have the same flow state when extruded from the same spinneret orifice, i.e. the apparent viscosities of the melts are close (for the same polymer, the greater the apparent viscosity, the poorer the flow property); the apparent viscosities of the PTT and the PBT can be adjusted through temperature, the invention can be matched with the intrinsic viscosity of a PTT melt and the intrinsic viscosity of a PBT melt through reasonably setting the temperature of a spinning box III, the temperature of a PTT melt spinning box II and the temperature of a PBT melt spinning box I, the PTT adopts low-temperature melting and high-temperature spinning, the PBT adopts low-temperature melting and high-temperature spinning, thus the degradation of the PBT and the PTT can be reduced, although the temperature difference of the two components in the box is larger, the two components enter the same composite component to exchange heat, the temperature of the PTT component is increased, the temperature of the PBT component is increased, the apparent viscosities of the two components extruded from a spinneret orifice are close to the same, and the smooth proceeding of spinning can be ensured.
The invention also provides the PBT/PTT double-component elastic yarn prepared by the preparation method of the PBT/PTT double-component elastic yarn, which consists of the PBT single yarn and the PBT/PTT parallel composite single yarn; the crimping directions of the filaments of the PBT/PTT bicomponent elastic filament are randomly distributed, and the random distribution is a mathematical concept, namely the crimping form of each fiber is different from that of other fibers, so that the prepared fabric has no uneven strip shade.
As a preferred technical scheme:
as for the PBT/PTT double-component elastic yarn, the PBT/PTT double-component elastic yarn has the crimping shrinkage rate of 61-67%, the crimping stability of 85-87%, the shrinkage elongation of 108-113% and the crimping elastic recovery of 96-99%.
The PBT/PTT double-component elastic yarn is characterized in that the breaking strength of the PBT/PTT double-component elastic yarn is more than or equal to 2.5cN/dtex, the elongation at break is 50.0 +/-5.0 percent, and the total titer is 70-200 dtex.
Preparing the prepared PBT/PTT double-component elastic yarn into a knitted fabric, and testing the uneven condition of the strip shade of the knitted fabric, wherein the testing process comprises the following steps: firstly, acquiring an image of the knitted fabric, converting the image into a gray image, then performing primary processing and secondary processing on the gray image, and calculating a parameter D, and representing the uneven degree of the striped shadow shape by using the parameter D, wherein the gray image comprises a striped shadow region, a high gray value region of a non-striped shadow region and a low gray value region of the non-striped shadow region; 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 gray scale image, and a represents the total number of pixels in the gray scale image.
The strip shade unevenness can be judged if the D value is more than or equal to 3 percent, and the serious strip shade unevenness can be judged if the D value is more than or equal to 10 percent. The test result of the knitted fabric made of the PBT/PTT double-component elastic yarn disclosed by the invention is as follows: the D value of the knitted fabric made of the PBT/PTT double-component elastic yarn is less than or equal to 1.0 percent; this demonstrates that the PBT/PET bicomponent elastic yarn in this application does not have the problem of "stripe-like unevenness" in the knitted fabric.
Has the advantages that:
(1) According to the PBT/PTT double-component elastic yarn and the preparation method thereof, the large ring and the small ring of the PBT/PTT double-component elastic yarn are sleeved by the POY-DTY process and the self-curling double-bending action, so that the yarn is curled more abundantly and the fiber is fluffy; the PBT and the PTT have low initial modulus, and the fiber is softer and more skin-friendly;
(2) According to the PBT/PTT double-component elastic yarn and the preparation method thereof, the mixed filament yarn composed of the PBT monofilament and the PBT/PTT parallel composite monofilament cannot form spiral curled regular arrangement, so that the problem of uneven strip shade formed by the PBT/PTT parallel composite fiber in a knitted fabric is solved;
(3) The PBT/PTT double-component elastic yarn prepared by the preparation method of the PBT/PTT double-component elastic yarn is excellent in comprehensive performance and wider in application.
Drawings
Fig. 1 is a schematic structural view of a spinneret plate according to the present invention;
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 GB/T6506-2001 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, placing 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 out 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 sample 1 (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 load 2 (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 l 3 (ii) a The percent elongation at Compression (CE) and the elastic recovery from crimp (SR) are calculated as follows:
CE＝(l 2 -l 1 )/l 1 *100；
SR＝(l 2 -l 3 )/(l 2 -l 1 )*100；
example 1
The preparation method of the PBT/PTT double-component elastic yarn comprises the following steps:
(1) Extruding the PBT/PTT double-component elastic yarns on the same spinneret plate;
the PBT melt (intrinsic viscosity 0.97 dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the PTT melt (the intrinsic viscosity is 1.03 dL/g) in a parallel composite spinning mode; the mass ratio of the PBT melt passing through the spinneret orifice n to the PTT melt is 50, and the equivalent diameter ratio of the spinneret orifice m to the spinneret orifice n is 1:1; the spinneret orifices m are round spinneret orifices, and the spinneret orifices n are round spinneret orifices; the number ratio of the spinneret orifices m of the direct extrusion flow to the spinneret orifices n of the extrusion flow after being distributed in the parallel composite spinning mode is 1:6;
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 flow splitting is to convey the PBT melt to the distribution hole A and the distribution hole B through the spinning beam I, and convey the PTT melt to the distribution hole C through the spinning beam II; the temperature of the spinning beam I is 269 ℃, the temperature of the spinning beam II is 272 ℃, and the temperature of the spinning beam III is 279 ℃; 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;
(2) Preparing PBT/PTT double-component elastic yarns according to a POY-DTY process after extrusion; wherein the parameters of the POY process are as follows: the cooling temperature is 24 ℃, the network pressure is 0.2MPa, and the winding speed is 2800m/min; the parameters of the DTY process are as follows: the spinning speed is 750m/min, the setting overfeed rate is 3.5 percent, the winding overfeed rate is 3 percent, the temperature of a first hot box is 200 ℃, the temperature of a second hot box is 173 ℃, the stretching ratio is 1.5, the D/Y value is 1.9, and the network pressure is 0.05MPa;
the prepared PBT/PTT double-component elastic yarn is formed by PBT monofilaments and PBT/PTT parallel composite monofilaments, and the crimping directions of the monofilaments are randomly distributed;
selecting the prepared PBT/PET double-component elastic yarns with randomly distributed monofilament curling directions for testing, wherein the testing results show that the elastic yarns have a curling shrinkage rate of 65%, a curling stability of 85%, a shrinkage elongation of 108% and a curling elastic recovery rate of 98%; the breaking strength was 27cN/dtex, the elongation at break was 49%, and the total fineness was 200dtex.
Comparative example 1
The preparation method of the PBT/PTT two-component elastic yarn has the same process as that of the embodiment 1, and the difference is that in the spinning, a PBT melt is not divided into two paths, but is distributed and extruded together with a PTT melt in a parallel composite spinning mode; therefore, the prepared PBT/PTT double-component elastic yarn does not contain PTT monofilaments.
The PBT/PTT double-component elastic yarns prepared in the comparative example 1 and the example 1 are respectively used for testing the uneven condition of the shade of strips of two plain woven fabrics by adopting a plain woven fabric woven by a seamless forming circular knitting machine, and the testing process of each plain woven fabric is as follows: firstly, acquiring a plain knitted fabric image, converting the plain 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 gray scale image, and a represents the total number of pixels in the gray scale image.
The results obtained from the tests were: the D value of the plain woven fabric made of the PBT/PTT two-component elastic yarn in the example 1 is 0.7%; the D value of the plain woven fabric made of the PBT/PTT two-component elastic yarn in comparative example 1 was 16.8%; this shows that the uneven stripes in the plain woven fabric woven by the PBT/PTT bicomponent elastic filament in example 1 are reduced because in example 1, a part of PBT monofilament is used to replace a part of PBT/PTT parallel composite monofilament, thereby breaking the neat left and right spiral form of the pure PBT/PTT bicomponent composite fiber; the crimping shape of each PBT/PTT parallel composite monofilament is different from other fibers, and the condition of uneven strip shade shape on the cloth surface can not occur after the PBT/PTT parallel composite monofilament is made into plain woven fabric; the plain woven fabric prepared from the PBT/PTT double-component elastic yarn of the comparative example 1 has regular left and right spiral forms, and the regular spiral form has uneven strip shade on the cloth surface.
Example 2
The preparation method of the PBT/PTT double-component elastic yarn comprises the following steps:
(1) Extruding the PBT/PTT double-component elastic yarns on the same spinneret plate;
the PBT melt (intrinsic viscosity 0.95 dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the PTT melt (the intrinsic viscosity is 1.05 dL/g) in a parallel composite spinning mode; the mass ratio of the PBT melt passing through the spinneret orifice n to the PTT melt is 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; the spinneret holes m are circular spinneret holes, and the spinneret holes n are oval spinneret holes; the number ratio of the spinneret orifices m of the direct extrusion flow to the spinneret orifices n of the extrusion flow after being distributed in the parallel composite spinning mode is 1:7;
the spinneret hole m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret hole n is composed of a guide hole 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 flow splitting is to convey the PBT melt to the distribution hole A and the distribution hole B through the spinning beam I, and convey the PTT melt to the distribution hole C through the spinning beam II; the temperature of the spinning beam I is 272 ℃, the temperature of the spinning beam II is 275 ℃, and the temperature of the spinning beam III is 276 ℃; 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;
(2) Preparing PBT/PTT double-component elastic yarns according to a POY-DTY process after extrusion; wherein the parameters of the POY process are as follows: the cooling temperature is 25 ℃, the network pressure is 0.21MPa, and the winding speed is 3000m/min; the parameters of the DTY process are as follows: the spinning speed is 800m/min, the setting overfeed rate is 3.8 percent, the winding overfeed rate is 3.3 percent, the temperature of a first hot box is 220 ℃, the temperature of a second hot box is 180 ℃, the stretching ratio is 1.9, the D/Y value is 2.2, and the network pressure is 1.5MPa;
the prepared PBT/PTT double-component elastic yarn is formed by PBT single yarns and PBT/PTT parallel composite single yarns, and the single yarns are randomly distributed in the curling direction;
selecting the prepared PBT/PET double-component elastic yarns with randomly distributed monofilament curling directions for testing, wherein the testing results show that the elastic yarns have the curling shrinkage rate of 61%, the curling stability of 86%, the shrinkage elongation of 108% and the curling elastic recovery rate of 97%; the breaking strength was 25cN/dtex, the elongation at break was 55%, and the total fineness was 105dtex.
Example 3
The preparation method of the PBT/PTT double-component elastic yarn comprises the following steps:
(1) Extruding the PBT/PTT double-component elastic yarns on the same spinneret plate;
the PBT melt (intrinsic viscosity 0.98 dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the PTT melt (the intrinsic viscosity is 1.1 dL/g) in a parallel composite spinning mode; the mass ratio of the PBT melt passing through the spinneret orifice n to the PTT melt is 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; the spinneret orifices m are circular spinneret orifices, and the spinneret orifices n are 8-shaped spinneret orifices; the number ratio of the spinneret orifices m of the direct extrusion flow to the spinneret orifices n of the extrusion flow after being distributed in the parallel composite spinning mode is 1:5;
the spinneret hole m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret hole n is composed of a guide hole 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 flow splitting is to convey the PBT melt to the distribution hole A and the distribution hole B through the spinning manifold I and convey the PTT melt to the distribution hole C through the spinning manifold II; the temperature of the spinning manifold I is 269 ℃, the temperature of the spinning manifold II is 276 ℃, and the temperature of the spinning manifold III is 276 ℃; 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;
(2) Preparing PBT/PTT double-component elastic yarns according to a POY-DTY process after extrusion; wherein the parameters of the POY process are as follows: the cooling temperature is 24 ℃, the network pressure is 0.22MPa, and the winding speed is 3100m/min; the parameters of the DTY process are as follows: the spinning speed is 770m/min, the setting overfeed rate is 4.5 percent, the winding overfeed rate is 3.9 percent, the temperature of a first hot box is 178 ℃, the temperature of a second hot box is 130 ℃, the stretching ratio is 1.5, the D/Y value is 1.8, and the network pressure is 1.4MPa;
the prepared PBT/PTT double-component elastic yarn is formed by PBT monofilaments and PBT/PTT parallel composite monofilaments, and the crimping directions of the monofilaments are randomly distributed;
selecting the prepared PBT/PET double-component elastic yarns with randomly distributed monofilament curling directions for testing, wherein the testing results show that the elastic yarns have a curling shrinkage rate of 65%, a curling stability of 87%, a shrinkage elongation of 110% and a curling elastic recovery rate of 98%; the breaking strength was 26cN/dtex, the elongation at break was 50% and the total fineness was 120dtex.
Example 4
The preparation method of the PBT/PTT double-component elastic yarn comprises the following steps:
(1) Extruding the PBT/PTT double-component elastic yarns on the same spinneret plate;
the PBT melt (intrinsic viscosity 0.94 dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the PTT melt (the intrinsic viscosity is 1 dL/g) in a parallel composite spinning mode; the mass ratio of the PBT melt passing through the spinneret orifice n to the PTT melt is 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; the spinneret orifices m are round spinneret orifices, and the spinneret orifices n are round spinneret orifices; the number ratio of the spinneret orifices m of the direct extrusion flow to the spinneret orifices n of the extrusion flow after being distributed in the parallel composite spinning mode is 1:6;
the spinneret hole m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret hole n is composed of a guide hole 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 holes A, B and C are positioned on the distribution plate in the spinning manifold III; the flow splitting is to convey the PBT melt to the distribution hole A and the distribution hole B through the spinning beam I, and convey the PTT melt to the distribution hole C through the spinning beam II; the temperature of the spinning manifold I is 270 ℃, the temperature of the spinning manifold II is 275 ℃, and the temperature of the spinning manifold III is 280 ℃; all the spinneret holes are distributed in concentric circles, the spinneret holes in the same circle are m or n, and the spinneret holes in the circle of the outermost circle are n;
(2) Preparing PBT/PTT double-component elastic yarns according to a POY-DTY process after extrusion; wherein the parameters of the POY process are as follows: the cooling temperature is 24 ℃, the network pressure is 0.24MPa, and the winding speed is 3450m/min; the parameters of the DTY process are as follows: spinning speed is 500m/min, setting overfeed rate is 5.5%, winding overfeed rate is 5%, temperature of a first hot box is 150 ℃, temperature of a second hot box is 140 ℃, stretching ratio is 1.7, D/Y value is 1.7, and network pressure is 2.3MPa;
the prepared PBT/PTT double-component elastic yarn is formed by PBT monofilaments and PBT/PTT parallel composite monofilaments, and the crimping directions of the monofilaments are randomly distributed;
selecting the prepared PBT/PET double-component elastic yarns with randomly distributed monofilament curling directions for testing, wherein the testing results show that the elastic yarns have the curling shrinkage rate of 63%, the curling stability of 85%, the shrinkage elongation of 108% and the curling elastic recovery rate of 98%; the breaking strength was 25cN/dtex, the elongation at break was 53%, and the total fineness was 105dtex.
Example 5
The preparation method of the PBT/PTT double-component elastic yarn comprises the following steps:
(1) Extruding the PBT/PTT double-component elastic yarns on the same spinneret plate;
the PBT melt (intrinsic viscosity 0.96 dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the PTT melt (the intrinsic viscosity is 1.08 dL/g) in a parallel composite spinning mode; the mass ratio of the PBT melt passing through the spinneret orifice n to the PTT melt is 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; the spinneret orifices m are round spinneret orifices, and the spinneret orifices n are round spinneret orifices; the number ratio of the spinneret orifices m which directly extrude and flow through to the spinneret orifices n which extrude and flow through after being distributed in a parallel composite spinning mode is 1:5;
the spinneret hole m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret hole n is composed of a guide hole 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 holes A, B and C are positioned on the distribution plate in the spinning manifold III; the flow splitting is to convey the PBT melt to the distribution hole A and the distribution hole B through the spinning manifold I and convey the PTT melt to the distribution hole C through the spinning manifold II; the temperature of the spinning beam I is 271 ℃, the temperature of the spinning beam II is 272 ℃, and the temperature of the spinning beam III is 276 ℃; 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;
(2) Preparing PBT/PTT double-component elastic yarns according to a POY-DTY process after extrusion; wherein the parameters of the POY process are as follows: the cooling temperature is 21 ℃, the network pressure is 0.27MPa, and the winding speed is 3500m/min; the parameters of the DTY process are as follows: spinning speed is 550m/min, setting overfeed rate is 4.4%, winding overfeed rate is 4.3%, temperature of a first hot box is 205 ℃, temperature of a second hot box is 100 ℃, stretching ratio is 1.7, D/Y value is 1.7, and network pressure is 3MPa;
the prepared PBT/PTT double-component elastic yarn is formed by PBT single yarns and PBT/PTT parallel composite single yarns, and the single yarns are randomly distributed in the curling direction;
selecting the prepared PBT/PET double-component elastic yarns with randomly distributed monofilament curling directions for testing, wherein the testing results show that the elastic yarns have a curling shrinkage rate of 62%, a curling stability of 85%, a shrinkage elongation of 110% and a curling elastic recovery rate of 99%; the breaking strength was 28cN/dtex, the elongation at break was 45%, and the total fineness was 145dtex.
Example 6
The preparation method of the PBT/PTT double-component elastic yarn comprises the following steps:
(1) Extruding the PBT/PTT double-component elastic yarns on the same spinneret plate;
the PBT melt (intrinsic viscosity 0.92 dL/g) was split into two paths: one path is directly extruded after being distributed; the other path of the PTT melt (the intrinsic viscosity is 1.09 dL/g) is distributed and extruded together in a parallel composite spinning mode; the mass ratio of the PBT melt passing through the spinneret orifice n to the PTT melt is 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; the spinneret holes m are circular spinneret holes, and the spinneret holes n are circular spinneret holes; the number ratio of the spinneret orifices m of the direct extrusion flow to the spinneret orifices n of the extrusion flow after being distributed in the parallel composite spinning mode is 1:6;
the spinneret hole m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret hole n is composed of a guide hole 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 holes A, B and C are positioned on the distribution plate in the spinning manifold III; the flow splitting is to convey the PBT melt to the distribution hole A and the distribution hole B through the spinning beam I, and convey the PTT melt to the distribution hole C through the spinning beam II; the temperature of the spinning manifold I is 269 ℃, the temperature of the spinning manifold II is 275 ℃, and the temperature of the spinning manifold III is 279 ℃; 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;
(2) Preparing PBT/PTT double-component elastic yarns according to a POY-DTY process after extrusion; wherein the parameters of the POY process are as follows: the cooling temperature is 20 ℃, the network pressure is 0.2MPa, and the winding speed is 3380m/min; the parameters of the DTY process are as follows: the spinning speed is 600m/min, the setting overfeed rate is 4.4 percent, the winding overfeed rate is 4.9 percent, the temperature of a first hot box is 200 ℃, the temperature of a second hot box is 175 ℃, the stretching ratio is 1.6, the D/Y value is 2.2, and the network pressure is 2.6MPa;
the prepared PBT/PTT double-component elastic yarn is formed by PBT monofilaments and PBT/PTT parallel composite monofilaments, and the crimping directions of the monofilaments are randomly distributed;
selecting the prepared PBT/PET double-component elastic yarns with randomly distributed monofilament curling directions for testing, wherein the testing results show that the elastic yarns have the curling shrinkage rate of 61%, the curling stability of 87%, the shrinkage elongation of 111% and the curling elastic recovery rate of 97%; the breaking strength was 25cN/dtex, the elongation at break was 52%, and the total fineness was 70dtex.
Example 7
The preparation method of the PBT/PTT double-component elastic yarn comprises the following steps:
(1) Extruding the PBT/PTT double-component elastic yarns on the same spinneret plate;
the PBT melt (intrinsic viscosity 1.05 dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the PTT melt (the intrinsic viscosity is 1.07 dL/g) in a parallel composite spinning mode; the mass ratio of the PBT melt passing through the spinneret orifice n to the PTT melt is 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; the spinneret orifices m are round spinneret orifices, and the spinneret orifices n are round spinneret orifices; the number ratio of the spinneret orifices m of the direct extrusion flow to the spinneret orifices n of the extrusion flow after being distributed in the parallel composite spinning mode is 1:7;
the spinneret hole m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret hole n is composed of a guide hole 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 holes A, B and C are positioned on the distribution plate in the spinning manifold III; the flow splitting is to convey the PBT melt to the distribution hole A and the distribution hole B through the spinning beam I, and convey the PTT melt to the distribution hole C through the spinning beam II; the temperature of the spinning box I is 269 ℃, the temperature of the spinning box II is 275 ℃, and the temperature of the spinning box III is 278 ℃; all the spinneret holes are distributed in concentric circles, the spinneret holes in the same circle are m or n, and the spinneret holes in the circle of the outermost circle are n;
(2) Preparing PBT/PTT double-component elastic yarns according to a POY-DTY process after extrusion; wherein the parameters of the POY process are as follows: the cooling temperature is 24 ℃, the network pressure is 0.3MPa, and the winding speed is 3110m/min; the parameters of the DTY process are as follows: the spinning speed is 750m/min, the setting overfeed rate is 5.2 percent, the winding overfeed rate is 2.5 percent, the temperature of a first hot box is 215 ℃, the temperature of a second hot box is 135 ℃, the stretching ratio is 1.6, the D/Y value is 2, and the network pressure is 2.1MPa;
the prepared PBT/PTT double-component elastic yarn is formed by PBT monofilaments and PBT/PTT parallel composite monofilaments, and the crimping directions of the monofilaments are randomly distributed;
selecting the prepared PBT/PET double-component elastic yarns with randomly distributed monofilament curling directions for testing, wherein the testing results show that the elastic yarns have the curling shrinkage of 64%, the curling stability of 86%, the shrinkage elongation of 108% and the curling elastic recovery of 96%; the breaking strength was 27cN/dtex, the elongation at break was 48%, and the total fineness was 115dtex.
Example 8
The preparation method of the PBT/PTT double-component elastic yarn comprises the following steps:
(1) Extruding the PBT/PTT double-component elastic yarns on the same spinneret plate;
the PBT melt (intrinsic viscosity 1.0 dL/g) was split into two paths: one path is directly extruded after being distributed; the other path is distributed and extruded together with the PTT melt (the intrinsic viscosity is 1.05 dL/g) in a parallel composite spinning mode; the mass ratio of the PBT melt passing through the spinneret orifice n to the PTT melt is 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; the spinneret orifices m are 8-shaped spinneret orifices, and the spinneret orifices n are circular spinneret orifices; the number ratio of the spinneret orifices m of the direct extrusion flow to the spinneret orifices n of the extrusion flow after being distributed in the parallel composite spinning mode is 1:7;
the spinneret orifice m consists of a guide orifice E, a transition orifice and a capillary micropore which are connected in sequence, the spinneret orifice n consists of a guide orifice D, a transition orifice and a 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 flow splitting is to convey the PBT melt to the distribution hole A and the distribution hole B through the spinning beam I, and convey the PTT melt to the distribution hole C through the spinning beam II; the temperature of the spinning manifold I is 268 ℃, the temperature of the spinning manifold II is 277 ℃, and the temperature of the spinning manifold III is 276 ℃; all the spinneret holes are distributed in concentric circles, the spinneret holes in the same circle are m or n, and the spinneret holes in the circle of the outermost circle are n;
(2) Preparing PBT/PTT double-component elastic yarns according to a POY-DTY process after extrusion; wherein the parameters of the POY process are as follows: the cooling temperature is 20 ℃, the network pressure is 0.27MPa, and the winding speed is 2900m/min; the parameters of the DTY process are as follows: spinning speed is 400m/min, setting overfeed rate is 5.2%, winding overfeed rate is 3.3%, temperature of a first hot box is 165 ℃, temperature of a second hot box is 120 ℃, stretching ratio is 1.5, D/Y value is 1.7, and network pressure is 1.9MPa;
the prepared PBT/PTT double-component elastic yarn is formed by PBT monofilaments and PBT/PTT parallel composite monofilaments, and the crimping directions of the monofilaments are randomly distributed;
selecting the prepared PBT/PET double-component elastic yarns with randomly distributed monofilament curling directions for testing, wherein the testing results show that the elastic yarns have the curling shrinkage of 67%, the curling stability of 87%, the shrinkage elongation of 113% and the curling elastic recovery of 96%; the breaking strength was 28cN/dtex, the elongation at break was 47%, and the total fineness was 144dtex.

Claims (6)

  1. A preparation method of a PBT/PTT double-component elastic yarn is characterized by comprising the following steps: extruding the PBT/PTT double-component elastic yarns on the same spinneret plate;
    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 PBT melt is divided into two paths: one path is directly extruded after being distributed; the other path is distributed together with the PTT melt according to a parallel composite spinning mode and then extruded;
    the number ratio of the spinneret orifices m through which the direct extrusion flows to the spinneret orifices n through which the extrusion flows after being distributed in a parallel composite spinning mode is 1 to 7;
    the mass ratio of the PBT melt passing through the spinneret orifice n to the PTT melt is 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;
    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 flow splitting is to convey the PBT melt to the distribution hole A and the distribution hole B through the spinning beam I, and convey the PTT melt to the distribution hole C through the spinning beam II;
    the intrinsic viscosity of the PBT melt is 0.92 to 1.05dL/g, the temperature of a spinning box I is 268 to 272 ℃, the intrinsic viscosity of the PTT melt is 1.00 to 1.10dL/g, the temperature of a spinning box II is 272 to 277 ℃, and the temperature of a spinning box III is 276 to 280 ℃;
    preparing PBT/PTT double-component elastic yarns according to a POY-DTY process after extrusion;
    the single filament curling directions of the PBT/PTT double-component elastic filaments are randomly distributed;
    preparing PBT/PTT double-component elastic yarns into a knitted fabric, and testing the uneven condition of the shade of the knitted fabric, wherein the testing process comprises the following steps: firstly, acquiring a knitted fabric image, converting the knitted fabric image into a gray image, then performing first processing and second processing on the gray image, and calculating a parameter D, and representing the uneven degree of the strip shadow shape by using the parameter D, wherein the gray image comprises a strip shadow area, a high gray value area of a non-strip shadow area and a low gray value area of the non-strip shadow area; the first processing is to change pixel points in a high gray value area of a non-bar-shadow area in a 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 = SB/A, wherein SB represents the number of pixel points with the gray scale value of 0 in the gray scale image, and A represents the total number of pixel points in the gray scale image; the D value of the knitted fabric made of the PBT/PTT double-component elastic yarn is less than or equal to 1.0 percent.
  2. 2. The process for preparing the PBT/PTT bicomponent elastic yarn according to claim 1, wherein the spinneret holes m are circular, oval, triangular, Y-shaped, cross-shaped, "8" -shaped, rectangular or I-shaped spinneret holes, and the spinneret holes n are circular, oval or "8" -shaped spinneret holes.
  3. 3. The preparation method of the PBT/PTT bi-component elastic yarn according to claim 1, wherein the parameters of the POY process are as follows: cooling at 20-25 ℃, network pressure of 0.20-0.30MPa, and winding speed of 2800-3500 m/min; the parameters of the DTY process are as follows: the spinning speed is 400 to 800m/min, the setting overfeed rate is 3.5 to 5.5 percent, the winding overfeed rate is 2.5 to 5.0 percent, the temperature of a first hot box is 150 to 220 ℃, the temperature of a second hot box is 100 to 180 ℃, the stretching multiple is 1.5 to 1.9, the D/Y value is 1.7 to 2.2, and the network pressure is 0.05 to 0.3MPa.
  4. 4. The PBT/PTT two-component elastic yarn prepared by the preparation method of the PBT/PTT two-component elastic yarn according to any one of claims 1~3 is characterized in that: consists of PBT monofilament and PBT/PTT composite monofilament.
  5. 5. The PBT/PTT two-component elastic filament according to claim 4, characterized in that the PBT/PTT two-component elastic filament has a crimp shrinkage of 61 to 67%, a crimp stability of 85 to 87%, a shrinkage elongation of 108 to 113%, and a crimp elastic recovery of 96 to 99%.
  6. 6. The PBT/PTT two-component elastic yarn according to claim 4, wherein the PBT/PTT two-component elastic yarn has a breaking strength of not less than 2.5cN/dtex, an elongation at break of 50.0 +/-5.0%, and a total fineness of 70 to 200dtex.
CN201911350180.5A 2019-12-24 2019-12-24 PBT/PTT double-component elastic yarn and preparation method thereof Active CN111118663B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911350180.5A CN111118663B (en) 2019-12-24 2019-12-24 PBT/PTT double-component elastic yarn and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911350180.5A CN111118663B (en) 2019-12-24 2019-12-24 PBT/PTT double-component elastic yarn and preparation method thereof

Publications (2)

Publication Number Publication Date
CN111118663A CN111118663A (en) 2020-05-08
CN111118663B true CN111118663B (en) 2023-01-31

Family

ID=70500556

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911350180.5A Active CN111118663B (en) 2019-12-24 2019-12-24 PBT/PTT double-component elastic yarn and preparation method thereof

Country Status (1)

Country Link
CN (1) CN111118663B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114855288A (en) * 2022-04-29 2022-08-05 宁波大千纺织品有限公司 Ultrahigh-crimpness PET (polyethylene terephthalate) polyester fiber and preparation method thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES337179A1 (en) * 1966-03-19 1968-08-16 Kanegafuchi Spinning Co Ltd A method of manufacturing stretchable knitted goods
EP1781850A2 (en) * 2004-07-16 2007-05-09 Reliance Industries Limited Self-crimping fully drawn high bulk yarns and method of producing thereof
CN101660212B (en) * 2009-09-21 2012-03-21 东华大学 Preparation method of heart-shaped composite fiber

Also Published As

Publication number Publication date
CN111118663A (en) 2020-05-08

Similar Documents

Publication Publication Date Title
CN110983465B (en) Method for preparing self-curling elastic combined filament yarn for knitting
CN111118617B (en) Full-dull elastic yarn and preparation method thereof
CN111118628B (en) PBT/PET double-component elastic yarn and preparation method thereof
CN111041578B (en) PET (polyethylene terephthalate) double-component elastic yarn with different viscosities and preparation method thereof
CN111118663B (en) PBT/PTT double-component elastic yarn and preparation method thereof
CN114144549B (en) Core-sheath type composite false-twist yarn and preparation method thereof
CN111101210B (en) Natural crimped fiber and preparation method thereof
CN111101238B (en) Parallel self-crimping elastic fiber and preparation method thereof
CN111058108B (en) Self-curling elastic combined filament yarn for knitting and preparation method thereof
CN111118665B (en) Polyester-nylon composite yarn and preparation method thereof
CN111101237B (en) High-low viscosity PET parallel composite self-crimping fiber and preparation method thereof
CN111118629B (en) Moisture-absorbing antibacterial knitted fabric and preparation method thereof
CN110965196B (en) Sports knitted fabric and preparation method thereof
CN110983466B (en) PTT/PET double-component elastic yarn and preparation method thereof
CN111101235B (en) CDP/PET double-component composite filament by one-step method and preparation method thereof
CN111041577B (en) PET/modified PET double-component elastic yarn and preparation method thereof
CN111101236B (en) Self-curling elastic combined filament yarn for knitted denim and preparation method thereof
KR102100565B1 (en) Core-sheath type composite false-twist yarn and manufacturing method thereof
JP3621293B2 (en) Multicolor partially fused false twisted yarn and method for producing the same
CN111101264B (en) Shrink-proof non-ironing wool-like fabric and preparation method thereof
JPH0651925B2 (en) Fiber with special cross-sectional shape
CN111118664B (en) Parallel self-curling wool-like elastic fiber and preparation method thereof
CN111118627B (en) Heat-humidity comfortable knitted fabric and preparation method thereof
CN111118630B (en) Soft polyester fiber and preparation method thereof
JP2008050717A (en) Textured composite polyester yarn

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