CN111041580B - PET/PBT (polyethylene terephthalate/polybutylene terephthalate) same-plate mixed filament yarn and preparation method thereof - Google Patents

PET/PBT (polyethylene terephthalate/polybutylene terephthalate) same-plate mixed filament yarn and preparation method thereof Download PDF

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CN111041580B
CN111041580B CN201911386326.1A CN201911386326A CN111041580B CN 111041580 B CN111041580 B CN 111041580B CN 201911386326 A CN201911386326 A CN 201911386326A CN 111041580 B CN111041580 B CN 111041580B
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pet
pbt
filament yarn
trilobal
spinneret orifices
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CN111041580A (en
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范红卫
王山水
王丽丽
汤方明
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Jiangsu Hengli Chemical Fiber Co Ltd
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Jiangsu Hengli Chemical Fiber Co Ltd
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
    • D01D5/30—Conjugate filaments; Spinnerette packs therefor
    • D01D5/34—Core-skin structure; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
    • D01D10/02—Heat treatment
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • 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
    • D01D5/23—Formation of filaments, threads, or the like with a crimped or curled structure; with a special structure to simulate wool by asymmetrical cooling of filaments, threads, or the like, leaving the spinnerettes
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/14—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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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Multicomponent Fibers (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

The invention relates to a preparation method of a PET/PBT same-plate mixed filament yarn, which comprises the steps of extruding PET and PBT from trilobal spinneret orifices and C-shaped spinneret orifices on a composite spinneret plate, cooling by circular blowing, and carrying out relaxation heat treatment according to an FDY process to obtain the PET/PBT same-plate mixed filament yarn; PET corresponds to the trilobal spinneret orifices, PBT corresponds to the C-shaped spinneret orifices, and all the spinneret orifices are distributed in concentric circles; the prepared PET/PBT same-plate mixed filament yarn has a three-dimensional curling shape and consists of a plurality of PET monofilaments with trilobal cross sections and a plurality of PBT monofilaments with C-shaped cross sections; the PET/PBT same-plate combined filament yarn has the crimping shrinkage rate of 40-43%, the crimping stability of 83-88%, the shrinkage elongation of 73-77% and the crimp elastic recovery of 88.5-92.6%; the breaking strength is more than or equal to 2.8cN/dtex, and the elongation at break is 35.0 +/-3.5%.

Description

PET/PBT (polyethylene terephthalate/polybutylene terephthalate) same-plate mixed filament yarn and preparation method thereof
Technical Field
The invention belongs to the technical field and relates to a PET/PBT same-plate mixed filament yarn and a preparation method thereof.
Background
For chemical fibers, fiber properties made of different polymer raw materials are completely different and have advantages and disadvantages, and therefore more and more products are made by integrating different fiber properties to exert respective advantages, wherein the parallel type bicomponent composite fiber utilizes the difference of the thermal shrinkage properties of the two components to enable the fiber to bend away from the axial direction of the fiber, so as to present permanent three-dimensional spiral crimp, and obtain crimp similar to wool fiber, and the crimp has the characteristics of durability, stability, good elasticity and the like, can endow fabric with better elasticity, bulkiness and coverage, and is widely applied to clothes. However, the polyester type two-component composite fiber has high requirements on the preparation process, mainly the flowing state of a polymer melt in a spinneret orifice needs to be controlled properly, and when the composite filament with smaller fiber number is prepared, the difficulty is higher, because the composite filament prepared by the method has the characteristic of curling elasticity, the moisture absorption and sweat release performance, the hand feeling fullness and the like of the composite filament are neglected, but because the polyester type two-component composite fiber is widely applied to fabrics such as underwear and the like, the moisture absorption and sweat release performance and the bulkiness of the composite filament are required to be further improved; and particularly on the knitted underwear, the stress concentration problem of the bicomponent composite fiber can also occur due to the consistent curling direction.
Therefore, the research on the three-dimensional self-crimping polyester fiber which is comfortable to wear and simple in preparation process is of great significance.
Disclosure of Invention
The invention provides a PET/PBT same-plate mixed filament yarn and a preparation method thereof; the purpose is to solve the problem of how to further improve the wearing comfort (moisture absorption and sweat release performance and bulkiness) of the polyester fiber when the three-dimensional curling shape is realized.
In order to achieve the purpose, the invention adopts the following scheme:
a preparation method of PET/PBT same-plate mixed filament yarn comprises the steps of firstly extruding PET and PBT from different spinneret orifices on a composite spinneret plate, cooling by adopting circular blowing, preparing FDY (fully drawn yarn) according to an FDY process, and then carrying out relaxation heat treatment on the FDY to obtain the PET/PBT same-plate mixed filament yarn;
different spinneret orifices are trilobal spinneret orifices and C-shaped spinneret orifices (the opening distance is more than 0.1mm), PET corresponds to the trilobal spinneret orifices, PBT corresponds to the C-shaped spinneret orifices, all the spinneret orifices are distributed in concentric circles, and the trilobal spinneret orifices are positioned on the circle of the outermost circle;
trilobal orifices fall into two categories:
the length ratio of three leaves of the first type of trilobal spinneret orifices is 1.0: 1.1-1.4: 2.0-2.5, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.5-3.5: 1, and the included angle of the central lines of two adjacent leaves is 120 degrees;
the length ratio of three leaves of the second type of trilobal spinneret orifice is 1.0: 1.5-2.0: 2.0-2.5, the two long leaves are not equal in length, the width ratio of the corresponding three leaves is 1.5:1:1, the length-width ratio of the shortest leaf is 2.5-3.5: 1, and the included angle of the central lines of the two adjacent leaves is 120 degrees;
the arrangement of the trefoil spinneret orifices meets the following requirements: the center line of the longest leaf of the first trilobal spinneret orifice passes through the center of the concentric circle and points to the center of the concentric circle; the center line of the shortest blade of the second type of trilobal spinneret orifices passes through the center of the concentric circle and points away from the center of the concentric circle; the number of trilobal orifices of both types is equal.
As a preferred technical scheme:
according to the preparation method of the PET/PBT same-plate mixed filament yarn, the number ratio of the trilobal spinneret orifices to the C-shaped spinneret orifices is 60: 40-70: 30.
According to the preparation method of the PET/PBT same-plate mixed filament, the mass ratio of PET to PBT is 50: 50.
According to the preparation method of the PET/PBT same-plate combined filament yarn, the intrinsic viscosity of PET is 0.50-0.58 dL/g, the temperature of a spinning box body corresponding to PET is 275-280 ℃, the intrinsic viscosity of PBT is 1.00-1.20 dL/g, and the temperature of a spinning box body corresponding to PBT is 260-265 ℃.
According to the preparation method of the PET/PBT same-plate mixed filament yarn, other parameters of the FDY process are as follows: the spinning temperature is 270-276 ℃, the cooling air speed is 1.8-2.3 m/s, the cooling temperature is 20-25 ℃, the first roller speed is 2000-2200 m/min, the first roller temperature is 70-80 ℃, the two roller speed is 2800-3000 m/min, the two roller temperature is 145-150 ℃, the network pressure is 0.4-0.45 MPa, the network speed is 40-43/m, and the winding speed is 2730-2910 m/min.
According to the preparation method of the PET/PBT co-plate combined filament yarn, the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
The invention also provides the PET/PBT same-plate mixed filament yarn prepared by the preparation method of the PET/PBT same-plate mixed filament yarn, which has a three-dimensional crimp shape and consists of a plurality of PET monofilaments with trilobal cross sections and a plurality of PBT monofilaments with C-shaped cross sections.
As a preferred technical scheme:
the PET/PBT co-plate combined filament yarn has the crimp shrinkage rate of 40-43%, the crimp stability of 83-88%, the shrinkage elongation of 73-77% and the crimp elastic recovery of 88.5-92.6% according to GB/T6506-2001.
According to the PET/PBT mixed filament yarn with the same plate, the breaking strength of the PET/PBT mixed filament yarn with the same plate is more than or equal to 2.8cN/dtex, the breaking elongation is 35.0 +/-3.5%, and the total fineness is 75-150 dtex.
The principle of the invention is as follows:
the PET/PBT same-plate mixed filament yarn disclosed by the invention consists of a plurality of PET monofilaments with trilobal cross sections and a plurality of PBT monofilaments with C-shaped cross sections, and is prepared according to an FDY (fully drawn yarn) process: extruding PET and PBT from different spinneret orifices on a composite spinneret plate, cooling by adopting circular blowing, and particularly: PET is extruded from corresponding trilobal spinneret orifices, the trilobal spinneret orifices are positioned on the circle of the outermost circle, the length and the width of three leaves of the trilobal spinneret orifices are not completely the same, and the trilobal spinneret orifices are in asymmetric structures; because when the cooling air blow is opposite to a certain leaf in the trilobal spinneret orifice, the cooling conditions of the three leaves are seriously asymmetric and unbalanced, so that after the fibers are sprayed out, the cooling speeds of the fusants at different positions on the cross section are inconsistent, and the main body is as follows: during spinning, the cooling air speed is high and is between 1.80 and 2.30m/s, the part close to the air blowing port is cooled earlier and faster, and the part far away from the air blowing port is cooled slower. When one of the three-blade shapes in the three-blade-shaped spinneret hole faces to the cooling wind, the melt of the blade is cooled quickly, the other parts of the three-blade shape are cooled slowly, and the contact area between the blade which firstly faces the wind and the cooling wind is larger and is easier to be cooled. Under the tension of drawing, other parts in the trilobal shape are more easily drawn to be thin and have more concentrated stress, so that a trilobal stress asymmetric structure can be formed on a fiber trefoil cross section, the fiber with asymmetric stress on the cross section can show three-dimensional curling performance in the heat treatment or drawing process, the curling is good, and the elastic recovery rate of the fiber is high. In addition, the distribution of each trilobal spinneret orifice on the spinneret orifices is not completely the same, so that the three-dimensional self-curling directions of the PET monofilaments with the trilobal cross sections are not completely the same, and the problem of stress concentration caused by the consistent curling directions in the application process can be avoided.
After relaxation heat treatment, the PET/PBT mixed filament yarn curls, and the curls are as follows: the three-dimensional self-curling shape of the PET monofilament is presented because the stress and the thickness of the cross section of the PET monofilament with the trefoil shape are not symmetrical; the other is that the PET monofilament and the PBT monofilament have different heat shrinkage rates, the PBT monofilament has larger shrinkage rate, and in the FDY process, the network pressure and the network speed are controlled, so that the PET monofilament is enabled to be protruded, and a coil in a curled shape is formed on the surface of the PBT monofilament.
Because the surface filament loops of the PET/PBT same-plate combined filament yarn are formed by PET monofilaments with trilobal cross sections and three-dimensional self-curling shapes, the fibers are endowed with good bulkiness and air permeability due to the curling shapes; and all monofilaments in the PET/PBT same-plate combined filament yarn are special-shaped cross-section fibers, the fibers with the grooves can endow the fabric with good moisture absorption and moisture conduction performance (wicking action of capillaries generated by the grooves), particularly, when the fibers with the grooves are subjected to self-curling, the same groove is turned inwards and outwards, so that a part which absorbs moisture firstly (usually the side facing the skin) can be turned to the outer side (the side facing the air) through the guiding action of the grooves, and compared with the special-shaped cross-section fibers in the prior art (the grooves of a single fiber usually face the same side), the PET/PBT same-plate combined filament yarn has higher water molecule transmission efficiency and better sweat releasing and moisture absorption performance.
Advantageous effects
(1) The invention relates to a preparation method of a PET/PBT same-plate combined filament yarn, wherein PET is extruded from a corresponding trilobal spinneret orifice, the spinneret orifice is an asymmetric trilobal spinneret orifice, and cooling is carried out by adopting cooling air with higher air speed, so that the PET/PBT same-plate combined filament yarn with three-dimensional curling performance is prepared;
(2) according to the PET/PBT same-plate mixed filament yarn, due to the shrinkage rate difference of the two components, and the single filaments are compounded in a non-parallel mode, under the action of network pressure and network speed, after relaxation heat treatment, the same-plate mixed filament yarn forms a structure with the PBT single filaments as core wires and the PET single filaments as surface filament loops;
(3) the PET/PBT same-plate combined filament yarn disclosed by the invention has good moisture absorption quick-drying property and fluffiness, and is wide in application range.
Drawings
FIG. 1 is a schematic view of the trilobal spinneret orifices of the present invention, (a) being a first type of trilobal spinneret orifice and (b) being a second type of trilobal spinneret orifice;
FIG. 2 is a schematic view of the distribution of the orifices of the present invention on a spinneret.
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 shape of the trilobal spinneret orifices of the present invention ((a) is a first type of trilobal spinneret orifice and (b) is a second type of trilobal spinneret orifice) and the distribution schematic diagram of the trilobal spinneret orifices are shown in fig. 1 and 2, and the trilobal spinneret orifices are divided into two types: the length ratio of three leaves of the first type of trilobal spinneret orifices is 1.0: 1.1-1.4: 2.0-2.5, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.5-3.5: 1, and the included angle of the central lines of two adjacent leaves is 120 degrees; the length ratio of three leaves of the second type of trilobal spinneret orifice is 1.0: 1.5-2.0: 2.0-2.5, the two long leaves are not equal in length, the width ratio of the corresponding three leaves is 1.5:1:1, the length-width ratio of the shortest leaf is 2.5-3.5: 1, and the included angle of the central lines of the two adjacent leaves is 120 degrees;
the arrangement of the trefoil spinneret orifices meets the following requirements: the center line of the longest leaf of the first trilobal spinneret orifice passes through the center of the concentric circle and points to the center of the concentric circle; the center line of the shortest blade of the second type of trilobal spinneret orifices passes through the center of the concentric circle and points away from the center of the concentric circle; the number of trilobal orifices of both types is equal.
Fig. 1 and 2 are merely schematic and are not intended to limit the present invention.
Example 1
A preparation method of a PET/PBT same-plate combined filament yarn comprises the following steps:
(1) firstly, extruding PET (intrinsic viscosity is 0.51dL/g) and PBT (intrinsic viscosity is 1.2dL/g) with the mass ratio of 50:50 from different spinneret holes on a composite spinneret plate, wherein the different spinneret holes are trilobal spinneret holes and C-shaped spinneret holes with the number ratio of 60:40, the PET corresponds to the trilobal spinneret holes, the PBT corresponds to the C-shaped spinneret holes, all the spinneret holes are distributed in concentric circles, and the trilobal spinneret holes are positioned on the circle at the outermost circle;
wherein, trilobal spinneret orifice is divided into two types:
the length ratio of three leaves of the first type of trilobal spinneret orifices is 1.0:1.1:2.0, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.7:1, and the included angle of the central lines of the two adjacent leaves is 120 degrees;
the length ratio of three leaves of the second type of trilobal spinneret orifice is 1.0:1.6:2.5, two long leaves are not equal in length, the width ratio of the corresponding three leaves is 1.5:1:1, the length ratio of the shortest leaf to the width ratio is 2.7:1, and the included angle of the central lines of two adjacent leaves is 120 degrees;
the arrangement of the trefoil spinneret orifices meets the following requirements: the center line of the longest leaf of the first trilobal spinneret orifice passes through the center of the concentric circle and points to the center of the concentric circle; the center line of the shortest blade of the second type of trilobal spinneret orifices passes through the center of the concentric circle and points away from the center of the concentric circle; the number of the two types of trilobal spinneret orifices is equal;
(2) cooling by adopting circular blowing, and preparing FDY filaments according to an FDY process; wherein, other parameters of the FDY process are as follows: the spinning temperature is 271 ℃, the temperature of a spinning box body corresponding to PET is 277 ℃, the temperature of a spinning box body corresponding to PBT is 262 ℃, the cooling temperature is 22 ℃, the cooling wind speed is 2.3m/s, the one-roller speed is 2170m/min, the one-roller temperature is 75 ℃, the two-roller speed is 2810m/min, the two-roller temperature is 1460 ℃, the network pressure is 0.43MPa, the network speed is 41/m, and the winding speed is 2740 m/min;
(3) carrying out relaxation heat treatment on the FDY filaments at the temperature of 118 ℃ for 21min to obtain PET/PBT same-plate mixed filament yarns;
the prepared PET/PBT same-plate mixed filament yarn has a three-dimensional curling shape and consists of a plurality of PET monofilaments with trilobal cross sections and a plurality of PBT monofilaments with C-shaped cross sections; the PET/PBT mixed filament yarn with the same plate has the crimp shrinkage rate of 43 percent, the crimp stability of 87 percent, the shrinkage elongation of 74 percent and the crimp elastic recovery rate of 92.6 percent; the breaking strength of the PET/PBT same-plate combined filament yarn is 2.8cN/dtex, the elongation at break is 38.5%, and the total titer is 134 dtex.
Example 2
A preparation method of a PET/PBT same-plate combined filament yarn comprises the following steps:
(1) firstly, extruding PET (intrinsic viscosity is 0.56dL/g) and PBT (intrinsic viscosity is 1.03dL/g) with the mass ratio of 50:50 from different spinneret holes on a composite spinneret plate, wherein the different spinneret holes are trilobal spinneret holes and C-shaped spinneret holes with the number ratio of 70:30, the PET corresponds to the trilobal spinneret holes, the PBT corresponds to the C-shaped spinneret holes, all the spinneret holes are distributed in concentric circles, and the trilobal spinneret holes are positioned on the circle at the outermost circle;
wherein, trilobal spinneret orifice is divided into two types:
the length ratio of three leaves of the first type of trilobal spinneret orifices is 1.0:1.1:2.5, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.5:1, and the included angle of the central lines of the two adjacent leaves is 120 degrees;
the length ratio of three leaves of the second type of trilobal spinneret orifice is 1.0:1.6:2.0, two long leaves are not equal in length, the width ratio of the corresponding three leaves is 1.5:1:1, the length ratio of the shortest leaf to the width ratio is 2.5:1, and the included angle of the central lines of two adjacent leaves is 120 degrees;
the arrangement of the trefoil spinneret orifices meets the following requirements: the center line of the longest leaf of the first trilobal spinneret orifice passes through the center of the concentric circle and points to the center of the concentric circle; the center line of the shortest blade of the second type of trilobal spinneret orifices passes through the center of the concentric circle and points away from the center of the concentric circle; the number of the two types of trilobal spinneret orifices is equal;
(2) cooling by adopting circular blowing, and preparing FDY filaments according to an FDY process; wherein, other parameters of the FDY process are as follows: the spinning temperature is 276 ℃, the temperature of a spinning box body corresponding to PET is 280 ℃, the temperature of a spinning box body corresponding to PBT is 265 ℃, the cooling temperature is 24 ℃, the cooling air speed is 2.2m/s, the first roller speed is 2150m/min, the first roller temperature is 77 ℃, the second roller speed is 2800m/min, the second roller temperature is 1450 ℃, the network pressure is 0.4MPa, the network speed is 43 m/m, and the winding speed is 2730 m/min;
(3) carrying out relaxation heat treatment on the FDY filaments at the temperature of 92 ℃ for 27min to obtain PET/PBT same-plate mixed filament yarns;
the prepared PET/PBT same-plate mixed filament yarn has a three-dimensional curling shape and consists of a plurality of PET monofilaments with trilobal cross sections and a plurality of PBT monofilaments with C-shaped cross sections; the PET/PBT same-plate combined filament has the crimping shrinkage of 40 percent, the crimping stability of 84 percent, the shrinkage elongation of 74 percent and the crimp elastic recovery of 88.5 percent; the breaking strength of the PET/PBT same-plate combined filament yarn is 2.85cN/dtex, the elongation at break is 37%, and the total titer is 110 dtex.
Example 3
A preparation method of a PET/PBT same-plate combined filament yarn comprises the following steps:
(1) firstly, extruding PET (intrinsic viscosity is 0.5dL/g) and PBT (intrinsic viscosity is 1dL/g) with the mass ratio of 50:50 from different spinneret holes on a composite spinneret plate, wherein the different spinneret holes are trilobal spinneret holes and C-shaped spinneret holes with the number ratio of 65:35, the PET corresponds to the trilobal spinneret holes, the PBT corresponds to the C-shaped spinneret holes, all the spinneret holes are distributed in concentric circles, and the trilobal spinneret holes are positioned on the circle at the outermost circle;
wherein, trilobal spinneret orifice is divided into two types:
the length ratio of three leaves of the first type of trilobal spinneret orifices is 1.0:1.4:2.0, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.5:1, and the included angle of the central lines of the two adjacent leaves is 120 degrees;
the length ratio of three leaves of the second type of trilobal spinneret orifices is 1.0:2.0:2.5, two long leaves are not equal in length, the width ratio of the corresponding three leaves is 1.5:1:1, the length ratio of the shortest leaf to the width ratio is 2.5:1, and the included angle of the central lines of two adjacent leaves is 120 degrees;
the arrangement of the trefoil spinneret orifices meets the following requirements: the center line of the longest leaf of the first trilobal spinneret orifice passes through the center of the concentric circle and points to the center of the concentric circle; the center line of the shortest blade of the second type of trilobal spinneret orifices passes through the center of the concentric circle and points away from the center of the concentric circle; the number of the two types of trilobal spinneret orifices is equal;
(2) cooling by adopting circular blowing, and preparing FDY filaments according to an FDY process; wherein, other parameters of the FDY process are as follows: the spinning temperature is 270 ℃, the temperature of a spinning box body corresponding to PET is 275 ℃, the temperature of a spinning box body corresponding to PBT is 261 ℃, the cooling temperature is 25 ℃, the cooling air speed is 2.1m/s, the first-roller speed is 2000m/min, the first-roller temperature is 70 ℃, the second-roller speed is 2800m/min, the two-roller temperature is 1450 ℃, the network pressure is 0.45MPa, the network speed is 43 m/m, and the winding speed is 2730 m/min;
(3) carrying out relaxation heat treatment on the FDY filaments at the temperature of 90 ℃ for 30min to obtain PET/PBT same-plate mixed filament yarns;
the prepared PET/PBT same-plate mixed filament yarn has a three-dimensional curling shape and consists of a plurality of PET monofilaments with trilobal cross sections and a plurality of PBT monofilaments with C-shaped cross sections; the PET/PBT mixed filament yarn with the same plate has the crimp shrinkage rate of 41 percent, the crimp stability of 83 percent, the shrinkage elongation of 73 percent and the crimp elastic recovery rate of 88.7 percent; the breaking strength of the PET/PBT same-plate combined filament yarn is 2.85cN/dtex, the elongation at break is 34%, and the total titer is 75 dtex.
Example 4
A preparation method of a PET/PBT same-plate combined filament yarn comprises the following steps:
(1) firstly, extruding PET (intrinsic viscosity is 0.58dL/g) and PBT (intrinsic viscosity is 1.2dL/g) with the mass ratio of 50:50 from different spinneret holes on a composite spinneret plate, wherein the different spinneret holes are trilobal spinneret holes and C-shaped spinneret holes with the number ratio of 60:40, the PET corresponds to the trilobal spinneret holes, the PBT corresponds to the C-shaped spinneret holes, all the spinneret holes are distributed in concentric circles, and the trilobal spinneret holes are positioned on the circle at the outermost circle;
wherein, trilobal spinneret orifice is divided into two types:
the length ratio of three leaves of the first type of trilobal spinneret orifices is 1.0:1.4:2.5, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 3.5:1, and the included angle of the central lines of the two adjacent leaves is 120 degrees;
the length ratio of three leaves of the second type of trilobal spinneret orifices is 1.0:1.5:2.5, two long leaves are not equal in length, the width ratio of the corresponding three leaves is 1.5:1:1, the length ratio of the shortest leaf to the width ratio is 3.5:1, and the included angle of the central lines of the two adjacent leaves is 120 degrees;
the arrangement of the trefoil spinneret orifices meets the following requirements: the center line of the longest leaf of the first trilobal spinneret orifice passes through the center of the concentric circle and points to the center of the concentric circle; the center line of the shortest blade of the second type of trilobal spinneret orifices passes through the center of the concentric circle and points away from the center of the concentric circle; the number of the two types of trilobal spinneret orifices is equal;
(2) cooling by adopting circular blowing, and preparing FDY filaments according to an FDY process; wherein, other parameters of the FDY process are as follows: the spinning temperature is 276 ℃, the temperature of a spinning box body corresponding to PET is 275 ℃, the temperature of a spinning box body corresponding to PBT is 262 ℃, the cooling temperature is 21 ℃, the cooling air speed is 2m/s, the first-roller speed is 2200m/min, the first-roller temperature is 80 ℃, the second-roller speed is 3000m/min, the second-roller temperature is 1500 ℃, the network pressure is 0.45MPa, the network speed is 40/m, and the winding speed is 2910 m/min;
(3) carrying out relaxation heat treatment on the FDY filaments at the temperature of 120 ℃ for 20min to obtain PET/PBT same-plate mixed filament yarns;
the prepared PET/PBT same-plate mixed filament yarn has a three-dimensional curling shape and consists of a plurality of PET monofilaments with trilobal cross sections and a plurality of PBT monofilaments with C-shaped cross sections; the PET/PBT mixed filament yarn with the same plate has the crimp shrinkage rate of 43 percent, the crimp stability of 88 percent, the shrinkage elongation of 77 percent and the crimp elastic recovery rate of 91.6 percent; the breaking strength of the PET/PBT same-plate combined filament yarn is 2.87cN/dtex, the elongation at break is 34 percent, and the total titer is 150 dtex.
Example 5
A preparation method of a PET/PBT same-plate combined filament yarn comprises the following steps:
(1) firstly, extruding PET (intrinsic viscosity is 0.53dL/g) and PBT (intrinsic viscosity is 1.09dL/g) with the mass ratio of 50:50 from different spinneret holes on a composite spinneret plate, wherein the different spinneret holes are trilobal spinneret holes and C-shaped spinneret holes with the number ratio of 60:40, the PET corresponds to the trilobal spinneret holes, the PBT corresponds to the C-shaped spinneret holes, all the spinneret holes are distributed in concentric circles, and the trilobal spinneret holes are positioned on the circle at the outermost circle;
wherein, trilobal spinneret orifice is divided into two types:
the length ratio of three leaves of the first type of trilobal spinneret orifices is 1.0:1.2:2.4, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 3.1:1, and the included angle of the central lines of the two adjacent leaves is 120 degrees;
the length ratio of three leaves of the second type of trilobal spinneret orifice is 1.0:1.8:2.4, two long leaves are not equal in length, the width ratio of the corresponding three leaves is 1.5:1:1, the length ratio of the shortest leaf to the width ratio is 2.6:1, and the included angle of the central lines of two adjacent leaves is 120 degrees;
the arrangement of the trefoil spinneret orifices meets the following requirements: the center line of the longest leaf of the first trilobal spinneret orifice passes through the center of the concentric circle and points to the center of the concentric circle; the center line of the shortest blade of the second type of trilobal spinneret orifices passes through the center of the concentric circle and points away from the center of the concentric circle; the number of the two types of trilobal spinneret orifices is equal;
(2) cooling by adopting circular blowing, and preparing FDY filaments according to an FDY process; wherein, other parameters of the FDY process are as follows: the spinning temperature is 275 ℃, the temperature of a spinning box body corresponding to PET is 280 ℃, the temperature of a spinning box body corresponding to PBT is 265 ℃, the cooling temperature is 25 ℃, the cooling air speed is 1.8m/s, the first roller speed is 2120m/min, the first roller temperature is 74 ℃, the two roller speed is 2940m/min, the two roller temperature is 1470 ℃, the network pressure is 0.44MPa, the network speed is 42 m/m, and the winding speed is 2870 m/min;
(3) carrying out relaxation heat treatment on the FDY filaments at 91 ℃ for 30min to obtain PET/PBT same-plate mixed filament yarns;
the prepared PET/PBT same-plate mixed filament yarn has a three-dimensional curling shape and consists of a plurality of PET monofilaments with trilobal cross sections and a plurality of PBT monofilaments with C-shaped cross sections; the PET/PBT same-plate combined filament yarn has the crimp shrinkage of 42%, the crimp stability of 83%, the shrinkage elongation of 75% and the crimp elastic recovery of 91.4%; the breaking strength of the PET/PBT same-plate combined filament yarn is 2.9cN/dtex, the elongation at break is 34 percent, and the total titer is 115 dtex.
Example 6
A preparation method of a PET/PBT same-plate combined filament yarn comprises the following steps:
(1) firstly, extruding PET (intrinsic viscosity is 0.56dL/g) and PBT (intrinsic viscosity is 1.12dL/g) with the mass ratio of 50:50 from different spinneret holes on a composite spinneret plate, wherein the different spinneret holes are trilobal spinneret holes and C-shaped spinneret holes with the number ratio of 70:30, the PET corresponds to the trilobal spinneret holes, the PBT corresponds to the C-shaped spinneret holes, all the spinneret holes are distributed in concentric circles, and the trilobal spinneret holes are positioned on the circle at the outermost circle;
wherein, trilobal spinneret orifice is divided into two types:
the length ratio of three leaves of the first type of trilobal spinneret orifices is 1.0:1.2:2.5, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.6:1, and the included angle of the central lines of the two adjacent leaves is 120 degrees;
the length ratio of three leaves of the second type of trilobal spinneret orifice is 1.0:1.6:2.2, two long leaves are not equal in length, the width ratio of the corresponding three leaves is 1.5:1:1, the length ratio of the shortest leaf to the width ratio is 3:1, and the included angle of the central lines of two adjacent leaves is 120 degrees;
the arrangement of the trefoil spinneret orifices meets the following requirements: the center line of the longest leaf of the first trilobal spinneret orifice passes through the center of the concentric circle and points to the center of the concentric circle; the center line of the shortest blade of the second type of trilobal spinneret orifices passes through the center of the concentric circle and points away from the center of the concentric circle; the number of the two types of trilobal spinneret orifices is equal;
(2) cooling by adopting circular blowing, and preparing FDY filaments according to an FDY process; wherein, other parameters of the FDY process are as follows: the spinning temperature is 273 ℃, the temperature of a spinning beam corresponding to PET is 276 ℃, the temperature of a spinning beam corresponding to PBT is 264 ℃, the cooling temperature is 23 ℃, the cooling air speed is 1.9m/s, the first-roller speed is 2010m/min, the first-roller temperature is 78 ℃, the second-roller speed is 2850m/min, the two-roller temperature is 1480 ℃, the network pressure is 0.41MPa, the network speed is 41 m/m, and the winding speed is 2780 m/min;
(3) carrying out relaxation heat treatment on the FDY filaments at the temperature of 97 ℃ for 26min to obtain PET/PBT same-plate mixed filament yarns;
the prepared PET/PBT same-plate mixed filament yarn has a three-dimensional curling shape and consists of a plurality of PET monofilaments with trilobal cross sections and a plurality of PBT monofilaments with C-shaped cross sections; the PET/PBT mixed filament yarn with the same plate has the crimp shrinkage of 41 percent, the crimp stability of 84 percent, the shrinkage elongation of 77 percent and the crimp elastic recovery of 91.2 percent; the breaking strength of the PET/PBT mixed filament yarn with the same plate is 2.96cN/dtex, the elongation at break is 33 percent, and the total fineness is 124 dtex.
Example 7
A preparation method of a PET/PBT same-plate combined filament yarn comprises the following steps:
(1) firstly, extruding PET (intrinsic viscosity is 0.55dL/g) and PBT (intrinsic viscosity is 1.17dL/g) with the mass ratio of 50:50 from different spinneret holes on a composite spinneret plate, wherein the different spinneret holes are trilobal spinneret holes and C-shaped spinneret holes with the number ratio of 65:35, the PET corresponds to the trilobal spinneret holes, the PBT corresponds to the C-shaped spinneret holes, all the spinneret holes are distributed in concentric circles, and the trilobal spinneret holes are positioned on the circle at the outermost circle;
wherein, trilobal spinneret orifice is divided into two types:
the length ratio of three leaves of the first type of trilobal spinneret orifices is 1.0:1.3:2.3, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.5:1, and the included angle of the central lines of the two adjacent leaves is 120 degrees;
the length ratio of three leaves of the second type of trilobal spinneret orifice is 1.0:2.0:2.5, two long leaves are not equal in length, the width ratio of the corresponding three leaves is 1.5:1:1, the length ratio of the shortest leaf to the width ratio is 3.5:1, and the included angle of the central lines of two adjacent leaves is 120 degrees;
the arrangement of the trefoil spinneret orifices meets the following requirements: the center line of the longest leaf of the first trilobal spinneret orifice passes through the center of the concentric circle and points to the center of the concentric circle; the center line of the shortest blade of the second type of trilobal spinneret orifices passes through the center of the concentric circle and points away from the center of the concentric circle; the number of the two types of trilobal spinneret orifices is equal;
(2) cooling by adopting circular blowing, and preparing FDY filaments according to an FDY process; wherein, other parameters of the FDY process are as follows: the spinning temperature is 270 ℃, the temperature of a spinning box body corresponding to PET is 278 ℃, the temperature of a spinning box body corresponding to PBT is 263 ℃, the cooling temperature is 20 ℃, the cooling air speed is 2.0m/s, the first-roller speed is 2100m/min, the first-roller temperature is 72 ℃, the second-roller speed is 2970m/min, the two-roller temperature is 1450 ℃, the network pressure is 0.42MPa, the network speed is 40/m, and the winding speed is 2900 m/min;
(3) carrying out relaxation heat treatment on the FDY filaments at the temperature of 99 ℃ for 22min to obtain PET/PBT same-plate mixed filament yarns;
the prepared PET/PBT same-plate mixed filament yarn has a three-dimensional curling shape and consists of a plurality of PET monofilaments with trilobal cross sections and a plurality of PBT monofilaments with C-shaped cross sections; the PET/PBT same-plate combined filament has the crimping shrinkage of 42 percent, the crimping stability of 84 percent, the shrinkage elongation of 74 percent and the crimp elastic recovery of 91.6 percent; the breaking strength of the PET/PBT same-plate combined filament yarn is 3.03cN/dtex, the elongation at break is 31.5%, and the total titer is 90 dtex.
Example 8
A preparation method of a PET/PBT same-plate combined filament yarn comprises the following steps:
(1) firstly, extruding PET (intrinsic viscosity is 0.5dL/g) and PBT (intrinsic viscosity is 1dL/g) with the mass ratio of 50:50 from different spinneret holes on a composite spinneret plate, wherein the different spinneret holes are trilobal spinneret holes and C-shaped spinneret holes with the number ratio of 65:35, the PET corresponds to the trilobal spinneret holes, the PBT corresponds to the C-shaped spinneret holes, all the spinneret holes are distributed in concentric circles, and the trilobal spinneret holes are positioned on the circle at the outermost circle;
wherein, trilobal spinneret orifice is divided into two types:
the length ratio of three leaves of the first type of trilobal spinneret orifices is 1.0:1.4:2.0, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 3:1, and the included angle of the central lines of the two adjacent leaves is 120 degrees;
the length ratio of three leaves of the second type of trilobal spinneret orifice is 1.0:1.5:2.0, two long leaves are not equal in length, the width ratio of the corresponding three leaves is 1.5:1:1, the length ratio of the shortest leaf to the width ratio is 2.6:1, and the included angle of the central lines of two adjacent leaves is 120 degrees;
the arrangement of the trefoil spinneret orifices meets the following requirements: the center line of the longest leaf of the first trilobal spinneret orifice passes through the center of the concentric circle and points to the center of the concentric circle; the center line of the shortest blade of the second type of trilobal spinneret orifices passes through the center of the concentric circle and points away from the center of the concentric circle; the number of the two types of trilobal spinneret orifices is equal;
(2) cooling by adopting circular blowing, and preparing FDY filaments according to an FDY process; wherein, other parameters of the FDY process are as follows: the spinning temperature is 270 ℃, the temperature of a spinning box body corresponding to PET is 275 ℃, the temperature of a spinning box body corresponding to PBT is 260 ℃, the cooling temperature is 25 ℃, the cooling air speed is 2.3m/s, the first-roller speed is 2060m/min, the first-roller temperature is 71 ℃, the two-roller speed is 2990m/min, the two-roller temperature is 1470 ℃, the network pressure is 0.44MPa, the network speed is 40/m, and the winding speed is 2910 m/min;
(3) carrying out relaxation heat treatment on the FDY filaments at the temperature of 104 ℃ for 21min to obtain PET/PBT same-plate mixed filament yarns;
the prepared PET/PBT same-plate mixed filament yarn has a three-dimensional curling shape and consists of a plurality of PET monofilaments with trilobal cross sections and a plurality of PBT monofilaments with C-shaped cross sections; the PET/PBT same-plate combined filament yarn has the crimp shrinkage rate of 41 percent, the crimp stability of 85 percent, the shrinkage elongation of 75 percent and the crimp elastic recovery rate of 90.8 percent; the breaking strength of the PET/PBT same-plate combined filament yarn is 3.05cN/dtex, the elongation at break is 32%, and the total titer is 90 dtex.

Claims (8)

1. A preparation method of PET/PBT same-plate mixed filament yarn is characterized by comprising the following steps: extruding PET and PBT from different spinneret orifices on a composite spinneret plate, cooling by adopting circular blowing, preparing FDY filaments according to an FDY process, and performing relaxation heat treatment on the FDY filaments to obtain PET/PBT same-plate mixed filament filaments;
different spinneret orifices are trilobal spinneret orifices and C-shaped spinneret orifices, PET corresponds to the trilobal spinneret orifices, PBT corresponds to the C-shaped spinneret orifices, all the spinneret orifices are distributed in concentric circles, and the trilobal spinneret orifices are positioned on the outermost circle;
trilobal orifices fall into two categories:
the length ratio of three leaves of the first type of trilobal spinneret orifices is 1.0: 1.1-1.4: 2.0-2.5, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.5-3.5: 1, and the included angle of the central lines of two adjacent leaves is 120 degrees;
the length ratio of three leaves of the second type of trilobal spinneret orifice is 1.0: 1.5-2.0: 2.0-2.5, the two long leaves are not equal in length, the width ratio of the corresponding three leaves is 1.5:1:1, the length-width ratio of the shortest leaf is 2.5-3.5: 1, and the included angle of the central lines of the two adjacent leaves is 120 degrees;
the arrangement of the trefoil spinneret orifices meets the following requirements: the center line of the longest leaf of the first trilobal spinneret orifice passes through the center of the concentric circle and points to the center of the concentric circle; the center line of the shortest blade of the second type of trilobal spinneret orifices passes through the center of the concentric circle and points away from the center of the concentric circle; the number of the two types of trilobal spinneret orifices is equal;
the FDY process includes the parameters: the cooling wind speed is 1.8-2.3 m/s, and the cooling temperature is 20-25 ℃;
the PET/PBT same-plate mixed filament yarn has a three-dimensional curling shape and consists of a plurality of PET monofilaments with trilobal cross sections and a plurality of PBT monofilaments with C-shaped cross sections.
2. The method for preparing the PET/PBT co-plate combined filament yarn according to claim 1, wherein the number ratio of the trilobal spinneret orifices to the C-shaped spinneret orifices is 60:40 to 70: 30.
3. The method for preparing the PET/PBT co-plate combined filament yarn according to claim 1, wherein the mass ratio of PET to PBT is 50: 50.
4. The preparation method of the PET/PBT co-plate combined filament yarn as claimed in claim 1, wherein the intrinsic viscosity of PET is 0.50-0.58 dL/g, the temperature of a spinning box corresponding to PET is 275-280 ℃, the intrinsic viscosity of PBT is 1.00-1.20 dL/g, and the temperature of a spinning box corresponding to PBT is 260-265 ℃.
5. The preparation method of the PET/PBT co-plate combined filament yarn according to claim 4, characterized in that other parameters of the FDY process are as follows: the spinning temperature is 270-276 ℃, the one-roll speed is 2000-2200 m/min, the one-roll temperature is 70-80 ℃, the two-roll speed is 2800-3000 m/min, the two-roll temperature is 145-150 ℃, the network pressure is 0.4-0.45 MPa, the network speed is 40-43/m, and the winding speed is 2730-2910 m/min.
6. The preparation method of the PET/PBT co-plate combined filament yarn according to claim 1, wherein the temperature of the relaxation heat treatment is 90-120 ℃ and the time is 20-30 min.
7. The preparation method of the PET/PBT co-sheet combined filament yarn as claimed in claim 1, wherein the PET/PBT co-sheet combined filament yarn has a crimp shrinkage of 40-43%, a crimp stability of 83-88%, a shrinkage elongation of 73-77%, and a crimp elastic recovery of 88.5-92.6%.
8. The preparation method of the PET/PBT co-plate combined filament yarn as claimed in claim 1, wherein the breaking strength of the PET/PBT co-plate combined filament yarn is more than or equal to 2.8cN/dtex, the elongation at break is 35.0 +/-3.5%, and the total fineness is 75-150 dtex.
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CN1962968A (en) * 2006-11-17 2007-05-16 东华大学 Method for preparing PBT/PET 3-D crimped fiber and use thereof
CN110067040A (en) * 2018-01-24 2019-07-30 东丽纤维研究所（中国）有限公司 A kind of high strength elastic fiber and preparation method thereof and fabric
CN209685962U (en) * 2019-01-29 2019-11-26 浦江德工精密机械有限公司 Three classes irregularly-shaped hole multiple spinneret

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CN1962968A (en) * 2006-11-17 2007-05-16 东华大学 Method for preparing PBT/PET 3-D crimped fiber and use thereof
CN110067040A (en) * 2018-01-24 2019-07-30 东丽纤维研究所（中国）有限公司 A kind of high strength elastic fiber and preparation method thereof and fabric
CN209685962U (en) * 2019-01-29 2019-11-26 浦江德工精密机械有限公司 Three classes irregularly-shaped hole multiple spinneret

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