CN111041574A - Staggered cross-shaped fiber and preparation method thereof - Google Patents
Staggered cross-shaped fiber and preparation method thereof Download PDFInfo
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- CN111041574A CN111041574A CN201911403115.4A CN201911403115A CN111041574A CN 111041574 A CN111041574 A CN 111041574A CN 201911403115 A CN201911403115 A CN 201911403115A CN 111041574 A CN111041574 A CN 111041574A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/06—Feeding liquid to the spinning head
- D01D1/09—Control of pressure, temperature or feeding rate
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/22—Formation of filaments, threads, or the like with a crimped or curled structure; with a special structure to simulate wool
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/28—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
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- 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
Abstract
The invention relates to a dislocation cross fiber and a preparation method thereof, according to a spinning process, after a high-viscosity PET melt and a low-viscosity PET melt are distributed, industrial yarns are extruded from spinneret orifices on the same spinneret plate, and then relaxation heat treatment is carried out to obtain the dislocation cross fiber; the spinning process comprises three steps of stretching and three steps of shaping, wherein the intrinsic viscosity of the high-viscosity PET melt is 1.15-1.20 dL/g, and the intrinsic viscosity of the low-viscosity PET melt is 0.80-0.85 dL/g; the cross section of the spinneret orifice is
The shape is formed by a transverse line and a vertical line I and a vertical line II which are vertically connected with the transverse line; dispensing means controlling the low viscosity PET melt to flow through the vertical line I, II while controlling the high viscosity PET melt to flow through the horizontal line; the obtained staggered cross-shaped fiber has a twisted shape. The preparation method is simple, and the prepared staggered cross-shaped fiber has excellent mechanical property and larger surface area per unit length.
Description
Technical Field
The invention belongs to the technical field of fibers, and relates to a staggered cross-shaped fiber and a preparation method thereof.
Background
Polyethylene terephthalate (PET) is a polymer with excellent performance, and the PET is widely applied to the fields of fibers, bottle packaging, films, sheets and the like due to high modulus, high strength, stiffness, good shape retention, purity, sanitation, good barrier property and the like, the yield is gradually increased year by year, and the industrial position is remarkably improved.
The industrial polyester fiber is widely applied to various aspects of industry, national defense, medical treatment, environmental protection and advanced science, has relatively special physical and chemical structures, properties and purposes or has special functions, and is mainly reflected in strong corrosion resistance, low abrasion, high temperature resistance, radiation resistance, flame resistance, high voltage resistance, high strength and high modulus and various medical functions.
However, the current industrial polyester fiber has the problem that the surface area per unit length is small, when the polyester fiber is used for preparing PVC covering cloth, heat-resistant canvas, water-repellent canvas, textilene cloth and the like, the polyester fiber can not be fully combined with PVC, TPU film, waterproof finishing agent and the like, and the combination strength of the PVC covering cloth, the heat-resistant canvas, the water-repellent canvas, the textilene cloth and the like is low, so that the performance of the product is poor.
Therefore, it is very significant to develop a method for increasing the surface area per unit length of the industrial polyester fiber.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the high-viscosity PET/low-viscosity PET bicomponent composite fiber with larger surface area per unit length.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a dislocation cross fiber comprises the steps of distributing high-viscosity PET melt and low-viscosity PET melt according to a spinning process, extruding the PET melt from spinneret orifices on the same spinneret plate to obtain industrial yarns, and performing relaxation heat treatment to obtain the dislocation cross fiber;
the parameters of the spinning process are as follows: the spinning temperature is 300-305 ℃, the cooling temperature is 20-25 ℃, the winding speed is 4450-4500 m/min, the first roller speed is 2000-2600 m/min, the first roller temperature is 75-80 ℃, the two roller speed is 2800-3500 m/min, the two roller temperature is 85-95 ℃, the three roller speed is 4000-4600 m/min, the three roller temperature is 250-255 ℃, the four roller speed is 4500-4600 m/min, the four roller temperature is 250-255 ℃, the five roller speed is 4630-4650 m/min, the five roller temperature is 250-255 ℃, the six roller speed is 4500-4600 m/min, and the six roller temperature is 250-255 ℃;
the intrinsic viscosity of the high-viscosity PET melt is 1.15-1.20 dL/g, the temperature of a spinning manifold of the high-viscosity PET melt is 305-310 ℃, the intrinsic viscosity of the low-viscosity PET melt is 0.80-0.85 dL/g, the temperature of a spinning manifold of the low-viscosity PET melt is 295-300 ℃, and the temperature of a spinning manifold of the component is 300-305 ℃;
the spinneret orifice is
The shape of the spinneret orifice is formed,
the shape is composed of a transverse line, and a vertical line I and a vertical line II which are vertically connected with the transverse line, wherein the vertical line I and the vertical line II are respectively positioned at two sides of the transverse line, the intersection point of the vertical line I and the transverse line is positioned at the position of the non-end point of the transverse line, the intersection point of the vertical line II and the transverse line is positioned at the position of the end point of the transverse line, and a certain distance exists between the two intersection points;
the length ratio of the vertical line I, the vertical line II and the transverse line is 1: 1.8-2.3: 3.5-4.0; the widths of the vertical line I and the vertical line II are the same as the widths of the horizontal lines; the ratio of the length to the width of the transverse line is 10-14: 1; the distance between the vertical line I and the vertical line II is 50 percent of the length of the transverse line;
the distribution refers to controlling the high-viscosity PET melt to flow through a transverse line and simultaneously controlling the low-viscosity PET melt to flow through a vertical line I and a vertical line II, or controlling the high-viscosity PET melt to flow through a vertical line I and a vertical line II and simultaneously controlling the low-viscosity PET melt to flow through a transverse line.
The invention aims to solve the problem that the surface area of the industrial polyester fiber in unit length is small in the prior art, and particularly relates to a method for preparing a bicomponent composite fiber, which achieves the mechanical property close to that of the industrial polyester fiber by selecting appropriate raw materials and adjusting the parameters of a spinning process, and simultaneously realizes the twisting of the fiber by reasonably designing the shape and the size of a spinneret orifice, wherein the mechanism is as follows:
the invention selects high-viscosity PET and low-viscosity PET with relatively high molecular weight (macroscopically embodied in larger intrinsic viscosity), designs three drawing and three sizing processes, and matches with corresponding process parameters to fully draw the fiber, thereby improving the crystallinity and orientation of the fiber and improving the mechanical property of the fiber;
in addition, the invention reasonably sets the temperature of the high-viscosity PET melt spinning manifold, the low-viscosity PET melt spinning manifold and the component spinning manifold, and ensures that the apparent viscosity of the high-viscosity PET component and the apparent viscosity of the low-viscosity PET component extruded from the spinneret orifices are closer, thereby ensuring the smooth running of spinning;
in the spinning process of synthetic fibers, when the fibers are formed, the inside of the fibers can be oriented and crystallized, so that the fibers have internal stress, when external conditions are changed, such as heating or contact with water, the formed fibers can be deformed due to environmental changes, namely, the oriented parts or crystallized areas in the fibers can be changed relatively, the internal stress of the fibers is an additional interaction force for trying to restore the deformed fibers to the initial state, for different polymers, the orientation and the crystallization inside the fibers are different, and therefore, the internal stress generated by different polymers is different;
in the present invention, the spinneret orifice is
The shape of the spinneret orifice is formed,
the shape of the vertical line I is composed of a transverse line and a vertical line I and a vertical line II which are vertically connected with the transverse line, wherein the vertical line I and the vertical line II are respectively positioned at two opposite sides of the transverse line, the width of the vertical line I is equal to that of the vertical line II, the length of the vertical line I is smaller than that of the vertical line II, the lengths of the vertical line I and the vertical line II are larger than that of the transverse line, the vertical line I and the vertical line II are made of low-viscosity PET, and the transverse line I and the vertical line II are made of high-viscosity PET;
at the contact position of the vertical line I or the vertical line II and the transverse line, two internal stresses in opposite directions exist simultaneously, the internal stress in one direction is derived from the high-viscosity PET, the internal stress in the other direction is derived from the low-viscosity PET, and the internal stresses in the two opposite directions are mutually offset to form the internal stress in a single direction;
because the lengths of the vertical line I and the vertical line II are greater than the width of the transverse line, and the internal stress of the low-viscosity PET is greater than that of the high-viscosity PET, the final direction of the internal stress points to the vertical line I at the position where the vertical line II is in contact with the transverse line, and the final direction of the internal stress points to the vertical line II at the position where the vertical line II is in contact with the transverse line, and the final direction of the internal stress at the position where the vertical line I is in contact with the transverse line is opposite to that at the position where the vertical line II is in contact with the transverse line because the vertical line I and the vertical line II are located on the opposite sides of the transverse line, the final direction of the internal stress at the
Two internal stresses in opposite directions exist on the cross section of the fiber, so that the fiber is twisted to form a self-twisted structure, and the surface of the fiber in unit length is actively and greatly increased due to the self-twisted structure of the fiber;
in addition, because the width of the vertical line I is equal to that of the vertical line II, and the length of the vertical line I is less than that of the vertical line II, the internal stress at the contact position of the vertical line I and the transverse line is less than that at the contact position of the vertical line II and the transverse line, and the internal stress is matched
Dimensional parameters of the shape such that the twist angle per unit length of the fiber
Reaches 74-183 degrees/10 mu m, and is beneficial to giving consideration to the performances of all aspects of the fiber.
As a preferable scheme:
according to the preparation method of the staggered cross-shaped fiber, the mass ratio of the high-viscosity PET melt to the low-viscosity PET melt is 55: 45-65: 35.
According to the preparation method of the staggered cross-shaped fiber, the composite spinning assembly is arranged in the assembly spinning box body and comprises a first distribution plate, a second distribution plate, a third distribution plate and a spinneret plate which are tightly attached from top to bottom;
the first distribution plate is provided with a runner A1 through which low-viscosity PET melt flows and a runner B1 through which high-viscosity PET melt flows;
the second distribution plate is provided with an outer ring groove O2, a middle ring groove M2 and an inner ring groove I2 which are distributed in concentric circles; o2 and I2 are circular grooves which are communicated with each other; m2 is a C-shaped groove and is not communicated with O2 and I2;
the third distribution plate is provided with an outer ring groove O3, a middle ring groove M3 and an inner ring groove I3 which are distributed in concentric circles, are not communicated with each other and are circular;
the orthographic projection of O2 and O3 completely coincides, the orthographic projection of M2 and M3 completely coincides, and the orthographic projection of I2 and I3 completely coincides;
a1 is in communication with O2 and I2, B1 is in communication with M2; a plurality of through holes are respectively formed in the bottoms of the O2, the M2, the O3, the M3, the I2 and the I3;
the surface of the third distribution plate, which is attached to the spinneret plate, is a lower plate surface, a plurality of groups of linear grooves E, grooves F and grooves G are arranged on the lower plate surface, and each group E, F, G is connected into a whole
A groove is shaped, E corresponds to a transverse line, F corresponds to a vertical line I, G corresponds to a vertical line II, through holes in M3 are positioned at two ends of E, a through hole in O3 is positioned at one end of F far away from E, and a through hole in I3 is positioned at one end of G far away from E;
on the spinneret plate
Guide hole of spinneret orifice and
the shape grooves are communicated, and the orthographic projections are completely overlapped.
The preparation method of the staggered cross-shaped fiber comprises the following spinning process flows: melting → metering → extrusion → cooling → oiling → stretching → heat setting → winding.
According to the preparation method of the staggered cross-shaped fiber, the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
The invention also provides the staggered cross-shaped fiber prepared by the preparation method of the staggered cross-shaped fiber, and the cross section of the staggered cross-shaped fiber is in the shape of a cross section
In the shape of a square,
the shape of the model is composed of transverse lines and vertical lines I and II which are vertically connected with the transverse lines, the vertical lines I and II are made of low-viscosity PET, and the transverse lines are made of high-viscosity PET; the dislocated cruciform fiber has a twisted morphology.
As a preferable scheme:
the staggered cross-shaped fiber has a twist angle per unit length
74 to 183 DEG/10 μm of
l is the length of the fiber section with a number of turns of 1 in μm).
The staggered cross-shaped fiber has the total fineness of 1500-3000 dtex, the breaking strength of more than or equal to 7.0cN/dtex, the elongation at break of 12.0 +/-1.5 percent and the dry heat shrinkage rate of 2.0 +/-0.25 percent under the conditions of 177 ℃, 10min and 0.05 cN/dtex.
Has the advantages that:
(1) according to the preparation method of the staggered cross-shaped fiber, the mechanical property of the high-viscosity PET/low-viscosity PET double-component composite fiber is improved through the selection of raw materials and the adjustment of a spinning process, so that the mechanical property of the composite fiber is close to that of industrial polyester fiber;
(2) according to the preparation method of the staggered cross-shaped fibers, the shape and the size of the spinneret orifice are reasonably designed, so that the fibers are twisted, and the surface area of the unit length of the high-viscosity PET/low-viscosity PET double-component composite fibers is increased;
(3) according to the preparation method of the staggered cross-shaped fiber, the temperatures of the high-viscosity PET melt spinning box body, the low-viscosity PET melt spinning box body and the component spinning box body are reasonably set, so that the smooth spinning of the high-viscosity PET/low-viscosity PET double-component composite fiber is ensured;
(4) the preparation method of the staggered cross-shaped fiber has the advantages of simple process, low cost and great application prospect;
(5) the staggered cross-shaped fiber prepared by the invention has a twisted shape and excellent comprehensive performance.
Drawings
FIG. 1 is an exploded schematic view of a composite spin pack assembly;
FIGS. 2-3 are schematic structural views of two side surfaces of a first distribution plate;
FIGS. 4 to 5 are schematic structural views of two side surfaces of the second distribution plate;
FIGS. 6 to 7 are schematic structural views of the surfaces of both sides of the third distribution plate;
fig. 8 is a schematic view of the structure of the spinneret plate.
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.
Example 1
A preparation method of a dislocation cross fiber comprises the steps of distributing a high-viscosity PET melt (the intrinsic viscosity is 1.2dL/g) and a low-viscosity PET melt (the intrinsic viscosity is 0.85dL/g) in a mass ratio of 55:45 according to a spinning process, extruding the PET melt from spinneret orifices on the same spinneret plate to obtain industrial yarns, and performing relaxation heat treatment to obtain the dislocation cross fiber;
as shown in FIG. 8, the spinneret plate has orifices
The shape of the spinneret orifice is formed,
the shape consists of a transverse line, a vertical line I and a vertical line II which are vertically connected with the transverse line, wherein the intersection point of the vertical line I and the transverse line is positioned at the position of the non-end point of the transverse line, and the intersection point of the vertical line II and the transverse line is positioned at the position of the end point of the transverse line; the length ratio of the vertical line I, the vertical line II and the transverse line is 1:2.3: 4; the widths of the vertical line I and the vertical line II are the same as the widths of the horizontal lines; the ratio of the length to the width of the transverse lines is 14: 1; the distance between the vertical line I and the vertical line II is 50 percent of the length of the transverse line;
the distribution means controlling the high-viscosity PET melt to flow through a transverse line and simultaneously controlling the low-viscosity PET melt to flow through a vertical line I and a vertical line II;
a composite spinning assembly is arranged in the assembly spinning box body, and comprises a first distribution plate, a second distribution plate, a third distribution plate and a spinneret plate which are tightly attached from top to bottom as shown in figures 1-7; the first distribution plate is provided with a runner A1 through which low-viscosity PET melt flows and a runner B1 through which high-viscosity PET melt flows; the second distribution plate is provided with an outer ring groove O2, a middle ring groove M2 and an inner ring groove I2 which are distributed in concentric circles; o2 and I2 are circular grooves which are communicated with each other; m2 is a C-shaped groove and is not communicated with O2 and I2; the third distribution plate is provided with an outer ring groove O3, a middle ring groove M3 and an inner ring groove I3 which are distributed in concentric circles, are not communicated with each other and are circular; the orthographic projection of O2 and O3 completely coincides, the orthographic projection of M2 and M3 completely coincides, and the orthographic projection of I2 and I3 completely coincides; a1 is in communication with O2 and I2, B1 is in communication with M2; a plurality of through holes are respectively formed in the bottoms of the O2, the M2, the O3, the M3, the I2 and the I3; the surface of the third distribution plate, which is attached to the spinneret plate, is a lower plate surface, a plurality of groups of linear grooves E, grooves F and grooves G are arranged on the lower plate surface, and each group E, F, G is connected into a whole
A groove is shaped, E corresponds to a transverse line, F corresponds to a vertical line I, G corresponds to a vertical line II, through holes in M3 are positioned at two ends of E, a through hole in O3 is positioned at one end of F far away from E, and a through hole in I3 is positioned at one end of G far away from E; on the spinneret plate
Guide hole of spinneret orifice and
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the spinning process flow comprises the following steps: melting → metering → extrusion → cooling → oiling → stretching → heat setting → winding;
the parameters of the spinning process are as follows: the cooling temperature is 25 ℃, the winding speed is 4500m/min, the first roller speed is 2600m/min, the first roller temperature is 80 ℃, the two roller speed is 3500m/min, the two roller temperature is 95 ℃, the three roller speed is 4600m/min, the three roller temperature is 255 ℃, the four roller speed is 4600m/min, the four roller temperature is 255 ℃, the five roller speed is 4650m/min, the five roller temperature is 255 ℃, the six roller speed is 4600m/min, and the six roller temperature is 255 ℃;
the temperature of the high-viscosity PET melt spinning manifold is 310 ℃, the temperature of the low-viscosity PET melt spinning manifold is 300 ℃, and the temperature of the component spinning manifold is 305 ℃;
the temperature of the relaxation heat treatment is 120 ℃, and the time is 20 min;
the cross section of the finally worthy staggered cross-shaped fiber is
In the shape of a square,
the shape of the model is composed of transverse lines and vertical lines I and II which are vertically connected with the transverse lines, the vertical lines I and II are made of low-viscosity PET, and the transverse lines are made of high-viscosity PET; the staggered cross-shaped fiber has a twisted shape and a twist angle per unit length
183 DEG/10 mu m; the total fineness of the staggered cross-shaped fiber is 3000dtex, the breaking strength is 7cN/dtex, the elongation at break is 13.5 percent, and the dry heat shrinkage rate under the conditions of 177 ℃, 10min and 0.05cN/dtex is 1.75 percent.
Example 2
A preparation method of a dislocation cross fiber comprises the steps of distributing a high-viscosity PET melt (the intrinsic viscosity is 1.19dL/g) and a low-viscosity PET melt (the intrinsic viscosity is 0.84dL/g) in a mass ratio of 55:45 according to a spinning process, extruding the PET melt from spinneret orifices on the same spinneret plate to obtain industrial yarns, and performing relaxation heat treatment to obtain the dislocation cross fiber;
the spinneret orifice is
The shape of the spinneret orifice is formed,
the shape consists of a transverse line, a vertical line I and a vertical line II which are vertically connected with the transverse line, wherein the intersection point of the vertical line I and the transverse line is positioned at the position of the non-end point of the transverse line, and the intersection point of the vertical line II and the transverse line is positioned at the position of the end point of the transverse line; the length ratio of the vertical line I, the vertical line II and the transverse line is 1:2.1: 3.8; the widths of the vertical line I and the vertical line II are the same as the widths of the horizontal lines; the ratio of the length to the width of the transverse lines is 11: 1; the distance between the vertical line I and the vertical line II is 50 percent of the length of the transverse line;
the distribution means controlling the high-viscosity PET melt to flow through a transverse line and simultaneously controlling the low-viscosity PET melt to flow through a vertical line I and a vertical line II;
a composite spinning assembly is arranged in the assembly spinning box body and comprises a first distribution plate, a second distribution plate, a third distribution plate and a spinneret plate which are tightly attached from top to bottom; the first distribution plate is provided with a runner A1 through which low-viscosity PET melt flows and a runner B1 through which high-viscosity PET melt flows; the second distribution plate is provided with an outer ring groove O2, a middle ring groove M2 and an inner ring groove I2 which are distributed in concentric circles; o2 and I2 are circular grooves which are communicated with each other; m2 is a C-shaped groove and is not communicated with O2 and I2; the third distribution plate is provided with an outer ring groove O3, a middle ring groove M3 and an inner ring groove I3 which are distributed in concentric circles, are not communicated with each other and are circular; the orthographic projection of O2 and O3 completely coincides, the orthographic projection of M2 and M3 completely coincides, and the orthographic projection of I2 and I3 completely coincides; a1 is in communication with O2 and I2, B1 is in communication with M2; a plurality of through holes are respectively formed in the bottoms of the O2, the M2, the O3, the M3, the I2 and the I3; the surface of the third distribution plate, which is attached to the spinneret plate, is a lower plate surface, and the lower plate surface is provided withHas multiple groups of straight-line grooves E, grooves F and grooves G, and each group E, F, G is connected into a whole
A groove is shaped, E corresponds to a transverse line, F corresponds to a vertical line I, G corresponds to a vertical line II, through holes in M3 are positioned at two ends of E, a through hole in O3 is positioned at one end of F far away from E, and a through hole in I3 is positioned at one end of G far away from E; on the spinneret plate
Guide hole of spinneret orifice and
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the spinning process flow comprises the following steps: melting → metering → extrusion → cooling → oiling → stretching → heat setting → winding;
the parameters of the spinning process are as follows: the cooling temperature is 25 ℃, the winding speed is 4450m/min, the one-roll speed is 2540m/min, the one-roll temperature is 77 ℃, the two-roll speed is 2970m/min, the two-roll temperature is 91 ℃, the three-roll speed is 4280m/min, the three-roll temperature is 250 ℃, the four-roll speed is 4530m/min, the four-roll temperature is 255 ℃, the five-roll speed is 4630m/min, the five-roll temperature is 250 ℃, the six-roll speed is 4530m/min, and the six-roll temperature is 250 ℃;
the temperature of the high-viscosity PET melt spinning manifold is 305 ℃, the temperature of the low-viscosity PET melt spinning manifold is 297 ℃, and the temperature of the component spinning manifold is 304 ℃;
the temperature of the relaxation heat treatment is 91 ℃, and the time is 27 min;
the cross section of the finally worthy staggered cross-shaped fiber is
In the shape of a square,
the shape of the model is composed of transverse lines and vertical lines I and II which are vertically connected with the transverse lines, the vertical lines I and II are made of low-viscosity PET, and the transverse lines are made of high-viscosity PET; the staggered cross-shaped fibers have a twisted shapeTorsion angle per unit length
104 DEG/10 mu m; the total fineness of the staggered crossed fibers is 1560dtex, the breaking strength is 7.02cN/dtex, the elongation at break is 13.1 percent, and the dry heat shrinkage rate under the conditions of 177 ℃, 10min and 0.05cN/dtex is 1.92 percent.
Example 3
A preparation method of a dislocation cross fiber comprises the steps of distributing a high-viscosity PET melt (the intrinsic viscosity is 1.2dL/g) and a low-viscosity PET melt (the intrinsic viscosity is 0.84dL/g) in a mass ratio of 60:40 according to a spinning process, extruding the PET melt from spinneret orifices on the same spinneret plate to obtain industrial yarns, and performing relaxation heat treatment to obtain the dislocation cross fiber;
the spinneret orifice is
The shape of the spinneret orifice is formed,
the shape consists of a transverse line, a vertical line I and a vertical line II which are vertically connected with the transverse line, wherein the intersection point of the vertical line I and the transverse line is positioned at the position of the non-end point of the transverse line, and the intersection point of the vertical line II and the transverse line is positioned at the position of the end point of the transverse line; the length ratio of the vertical line I, the vertical line II and the transverse line is 1:2.1: 3.8; the widths of the vertical line I and the vertical line II are the same as the widths of the horizontal lines; the ratio of the length to the width of the transverse lines is 14: 1; the distance between the vertical line I and the vertical line II is 50 percent of the length of the transverse line;
the distribution means controlling the high-viscosity PET melt to flow through a transverse line and simultaneously controlling the low-viscosity PET melt to flow through a vertical line I and a vertical line II;
a composite spinning assembly is arranged in the assembly spinning box body and comprises a first distribution plate, a second distribution plate, a third distribution plate and a spinneret plate which are tightly attached from top to bottom; the first distribution plate is provided with a runner A1 through which low-viscosity PET melt flows and a runner B1 through which high-viscosity PET melt flows; the second distribution plate is provided with an outer ring groove O2, a middle ring groove M2 and an inner ring groove I2 which are distributed in concentric circles; o2 and I2 are circular grooves which are communicated with each other; m2 is C-shapedA groove not in communication with O2 and I2; the third distribution plate is provided with an outer ring groove O3, a middle ring groove M3 and an inner ring groove I3 which are distributed in concentric circles, are not communicated with each other and are circular; the orthographic projection of O2 and O3 completely coincides, the orthographic projection of M2 and M3 completely coincides, and the orthographic projection of I2 and I3 completely coincides; a1 is in communication with O2 and I2, B1 is in communication with M2; a plurality of through holes are respectively formed in the bottoms of the O2, the M2, the O3, the M3, the I2 and the I3; the surface of the third distribution plate, which is attached to the spinneret plate, is a lower plate surface, a plurality of groups of linear grooves E, grooves F and grooves G are arranged on the lower plate surface, and each group E, F, G is connected into a whole
A groove is shaped, E corresponds to a transverse line, F corresponds to a vertical line I, G corresponds to a vertical line II, through holes in M3 are positioned at two ends of E, a through hole in O3 is positioned at one end of F far away from E, and a through hole in I3 is positioned at one end of G far away from E; on the spinneret plate
Guide hole of spinneret orifice and
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the spinning process flow comprises the following steps: melting → metering → extrusion → cooling → oiling → stretching → heat setting → winding;
the parameters of the spinning process are as follows: the cooling temperature is 25 ℃, the winding speed is 4470m/min, the one-roll speed is 2300m/min, the one-roll temperature is 76 ℃, the two-roll speed is 3130m/min, the two-roll temperature is 93 ℃, the three-roll speed is 4560m/min, the three-roll temperature is 254 ℃, the four-roll speed is 4580m/min, the four-roll temperature is 253 ℃, the five-roll speed is 4640m/min, the five-roll temperature is 253 ℃, the six-roll speed is 4520m/min, and the six-roll temperature is 254 ℃;
the temperature of the high-viscosity PET melt spinning manifold is 306 ℃, the temperature of the low-viscosity PET melt spinning manifold is 298 ℃, and the temperature of the component spinning manifold is 304 ℃;
the temperature of the relaxation heat treatment is 112 ℃, and the time is 22 min;
the cross section of the finally worthy staggered cross-shaped fiber is
In the shape of a square,
the shape of the model is composed of transverse lines and vertical lines I and II which are vertically connected with the transverse lines, the vertical lines I and II are made of low-viscosity PET, and the transverse lines are made of high-viscosity PET; the staggered cross-shaped fiber has a twisted shape and a twist angle per unit length
135 degree/10 μm; the total titer of the staggered cross-shaped fiber is 2350dtex, the breaking strength is 7.24cN/dtex, the elongation at break is 12.9 percent, and the dry heat shrinkage rate under the conditions of 177 ℃, 10min and 0.05cN/dtex is 1.93 percent.
Example 4
A preparation method of a dislocation cross fiber comprises the steps of distributing a high-viscosity PET melt (the intrinsic viscosity is 1.16dL/g) and a low-viscosity PET melt (the intrinsic viscosity is 0.83dL/g) in a mass ratio of 55:45 according to a spinning process, extruding the PET melt from spinneret orifices on the same spinneret plate to obtain industrial yarns, and performing relaxation heat treatment to obtain the dislocation cross fiber;
the spinneret orifice is
The shape of the spinneret orifice is formed,
the shape consists of a transverse line, a vertical line I and a vertical line II which are vertically connected with the transverse line, wherein the intersection point of the vertical line I and the transverse line is positioned at the position of the non-end point of the transverse line, and the intersection point of the vertical line II and the transverse line is positioned at the position of the end point of the transverse line; the length ratio of the vertical line I, the vertical line II and the transverse line is 1:2.1: 3.7; the widths of the vertical line I and the vertical line II are the same as the widths of the horizontal lines; the ratio of the length to the width of the transverse lines is 11: 1; the distance between the vertical line I and the vertical line II is 50 percent of the length of the transverse line;
the distribution means controlling the high-viscosity PET melt to flow through a transverse line and simultaneously controlling the low-viscosity PET melt to flow through a vertical line I and a vertical line II;
a composite spinning assembly is arranged in the assembly spinning box body and comprises a first distribution plate, a second distribution plate, a third distribution plate and a spinneret plate which are tightly attached from top to bottom; the first distribution plate is provided with a runner A1 through which low-viscosity PET melt flows and a runner B1 through which high-viscosity PET melt flows; the second distribution plate is provided with an outer ring groove O2, a middle ring groove M2 and an inner ring groove I2 which are distributed in concentric circles; o2 and I2 are circular grooves which are communicated with each other; m2 is a C-shaped groove and is not communicated with O2 and I2; the third distribution plate is provided with an outer ring groove O3, a middle ring groove M3 and an inner ring groove I3 which are distributed in concentric circles, are not communicated with each other and are circular; the orthographic projection of O2 and O3 completely coincides, the orthographic projection of M2 and M3 completely coincides, and the orthographic projection of I2 and I3 completely coincides; a1 is in communication with O2 and I2, B1 is in communication with M2; a plurality of through holes are respectively formed in the bottoms of the O2, the M2, the O3, the M3, the I2 and the I3; the surface of the third distribution plate, which is attached to the spinneret plate, is a lower plate surface, a plurality of groups of linear grooves E, grooves F and grooves G are arranged on the lower plate surface, and each group E, F, G is connected into a whole
A groove is shaped, E corresponds to a transverse line, F corresponds to a vertical line I, G corresponds to a vertical line II, through holes in M3 are positioned at two ends of E, a through hole in O3 is positioned at one end of F far away from E, and a through hole in I3 is positioned at one end of G far away from E; on the spinneret plate
Guide hole of spinneret orifice and
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the spinning process flow comprises the following steps: melting → metering → extrusion → cooling → oiling → stretching → heat setting → winding;
the parameters of the spinning process are as follows: the cooling temperature is 25 ℃, the winding speed is 4460m/min, the first roller speed is 2290m/min, the first roller temperature is 77 ℃, the two roller speed is 3230m/min, the two roller temperature is 92 ℃, the three roller speed is 4350m/min, the three roller temperature is 255 ℃, the four roller speed is 4550m/min, the four roller temperature is 254 ℃, the five roller speed is 4640m/min, the five roller temperature is 250 ℃, the six roller speed is 4500m/min, and the six roller temperature is 252 ℃;
the temperature of the high-viscosity PET melt spinning manifold is 305 ℃, the temperature of the low-viscosity PET melt spinning manifold is 295 ℃, and the temperature of the component spinning manifold is 304 ℃;
the temperature of the relaxation heat treatment is 108 ℃, and the time is 24 min;
the cross section of the finally worthy staggered cross-shaped fiber is
In the shape of a square,
the shape of the model is composed of transverse lines and vertical lines I and II which are vertically connected with the transverse lines, the vertical lines I and II are made of low-viscosity PET, and the transverse lines are made of high-viscosity PET; the staggered cross-shaped fiber has a twisted shape and a twist angle per unit length
103 DEG/10 mu m; the total fineness of the staggered crossed fiber is 2480dtex, the breaking strength is 7.31cN/dtex, the elongation at break is 12.9 percent, and the dry heat shrinkage rate under the conditions of 177 ℃, 10min and 0.05cN/dtex is 1.97 percent.
Example 5
A preparation method of a dislocation cross fiber comprises the steps of distributing a high-viscosity PET melt (the intrinsic viscosity is 1.19dL/g) and a low-viscosity PET melt (the intrinsic viscosity is 0.83dL/g) in a mass ratio of 65:35 according to a spinning process, extruding the PET melt from spinneret orifices on the same spinneret plate to obtain industrial yarns, and performing relaxation heat treatment to obtain the dislocation cross fiber;
the spinneret orifice is
The shape of the spinneret orifice is formed,
the shape is composed of a transverse line, a vertical line I and a vertical line II which are vertically connected with the transverse line, and the intersection point of the vertical line I and the transverse line is positioned at the position of the non-end point of the transverse lineThe intersection point of the vertical line II and the transverse line is positioned at the end point of the transverse line; the length ratio of the vertical line I, the vertical line II and the transverse line is 1:1.8: 3.8; the widths of the vertical line I and the vertical line II are the same as the widths of the horizontal lines; the ratio of the length to the width of the transverse lines is 10: 1; the distance between the vertical line I and the vertical line II is 50 percent of the length of the transverse line;
the distribution means controlling the high-viscosity PET melt to flow through a transverse line and simultaneously controlling the low-viscosity PET melt to flow through a vertical line I and a vertical line II;
a composite spinning assembly is arranged in the assembly spinning box body and comprises a first distribution plate, a second distribution plate, a third distribution plate and a spinneret plate which are tightly attached from top to bottom; the first distribution plate is provided with a runner A1 through which low-viscosity PET melt flows and a runner B1 through which high-viscosity PET melt flows; the second distribution plate is provided with an outer ring groove O2, a middle ring groove M2 and an inner ring groove I2 which are distributed in concentric circles; o2 and I2 are circular grooves which are communicated with each other; m2 is a C-shaped groove and is not communicated with O2 and I2; the third distribution plate is provided with an outer ring groove O3, a middle ring groove M3 and an inner ring groove I3 which are distributed in concentric circles, are not communicated with each other and are circular; the orthographic projection of O2 and O3 completely coincides, the orthographic projection of M2 and M3 completely coincides, and the orthographic projection of I2 and I3 completely coincides; a1 is in communication with O2 and I2, B1 is in communication with M2; a plurality of through holes are respectively formed in the bottoms of the O2, the M2, the O3, the M3, the I2 and the I3; the surface of the third distribution plate, which is attached to the spinneret plate, is a lower plate surface, a plurality of groups of linear grooves E, grooves F and grooves G are arranged on the lower plate surface, and each group E, F, G is connected into a whole
A groove is shaped, E corresponds to a transverse line, F corresponds to a vertical line I, G corresponds to a vertical line II, through holes in M3 are positioned at two ends of E, a through hole in O3 is positioned at one end of F far away from E, and a through hole in I3 is positioned at one end of G far away from E; on the spinneret plate
Guide hole of spinneret orifice and
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the spinning process flow comprises the following steps: melting → metering → extrusion → cooling → oiling → stretching → heat setting → winding;
the parameters of the spinning process are as follows: the cooling temperature is 24 ℃, the winding speed is 4500m/min, the one-roll speed is 2250m/min, the one-roll temperature is 77 ℃, the two-roll speed is 3150m/min, the two-roll temperature is 88 ℃, the three-roll speed is 4270m/min, the three-roll temperature is 253 ℃, the four-roll speed is 4570m/min, the four-roll temperature is 250 ℃, the five-roll speed is 4640m/min, the five-roll temperature is 252 ℃, the six-roll speed is 4530m/min, and the six-roll temperature is 250 ℃;
the temperature of the high-viscosity PET melt spinning manifold is 305 ℃, the temperature of the low-viscosity PET melt spinning manifold is 296 ℃, and the temperature of the component spinning manifold is 300 ℃;
the temperature of the relaxation heat treatment is 92 ℃, and the time is 26 min;
the cross section of the finally worthy staggered cross-shaped fiber is
In the shape of a square,
the shape of the model is composed of transverse lines and vertical lines I and II which are vertically connected with the transverse lines, the vertical lines I and II are made of low-viscosity PET, and the transverse lines are made of high-viscosity PET; the staggered cross-shaped fiber has a twisted shape and a twist angle per unit length
85 DEG/10 mu m; the total fineness of the staggered cross-shaped fiber is 1620dtex, the breaking strength is 7.35cN/dtex, the elongation at break is 12.5%, and the dry heat shrinkage rate under the conditions of 177 ℃, 10min and 0.05cN/dtex is 2.01%.
Example 6
A preparation method of a dislocation cross fiber comprises the steps of distributing a high-viscosity PET melt (the intrinsic viscosity is 1.2dL/g) and a low-viscosity PET melt (the intrinsic viscosity is 0.84dL/g) in a mass ratio of 65:35 according to a spinning process, extruding the PET melt from spinneret orifices on the same spinneret plate to obtain industrial yarns, and performing relaxation heat treatment to obtain the dislocation cross fiber;
the spinneret orifice is
The shape of the spinneret orifice is formed,
the shape consists of a transverse line, a vertical line I and a vertical line II which are vertically connected with the transverse line, wherein the intersection point of the vertical line I and the transverse line is positioned at the position of the non-end point of the transverse line, and the intersection point of the vertical line II and the transverse line is positioned at the position of the end point of the transverse line; the length ratio of the vertical line I, the vertical line II and the transverse line is 1:2: 3.6; the widths of the vertical line I and the vertical line II are the same as the widths of the horizontal lines; the ratio of the length to the width of the transverse lines is 13: 1; the distance between the vertical line I and the vertical line II is 50 percent of the length of the transverse line;
the distribution means controlling the high-viscosity PET melt to flow through a transverse line and simultaneously controlling the low-viscosity PET melt to flow through a vertical line I and a vertical line II;
a composite spinning assembly is arranged in the assembly spinning box body and comprises a first distribution plate, a second distribution plate, a third distribution plate and a spinneret plate which are tightly attached from top to bottom; the first distribution plate is provided with a runner A1 through which low-viscosity PET melt flows and a runner B1 through which high-viscosity PET melt flows; the second distribution plate is provided with an outer ring groove O2, a middle ring groove M2 and an inner ring groove I2 which are distributed in concentric circles; o2 and I2 are circular grooves which are communicated with each other; m2 is a C-shaped groove and is not communicated with O2 and I2; the third distribution plate is provided with an outer ring groove O3, a middle ring groove M3 and an inner ring groove I3 which are distributed in concentric circles, are not communicated with each other and are circular; the orthographic projection of O2 and O3 completely coincides, the orthographic projection of M2 and M3 completely coincides, and the orthographic projection of I2 and I3 completely coincides; a1 is in communication with O2 and I2, B1 is in communication with M2; a plurality of through holes are respectively formed in the bottoms of the O2, the M2, the O3, the M3, the I2 and the I3; the surface of the third distribution plate, which is attached to the spinneret plate, is a lower plate surface, a plurality of groups of linear grooves E, grooves F and grooves G are arranged on the lower plate surface, and each group E, F, G is connected into a whole
The shape of the groove is that E corresponds to a transverse line, F corresponds to a vertical line I, G corresponds to a vertical line II, through holes on M3 are positioned at two ends of E and on O3The through hole is positioned at one end of the F far away from the E, and the through hole on the I3 is positioned at one end of the G far away from the E; on the spinneret plate
Guide hole of spinneret orifice and
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the spinning process flow comprises the following steps: melting → metering → extrusion → cooling → oiling → stretching → heat setting → winding;
the parameters of the spinning process are as follows: the cooling temperature is 23 ℃, the winding speed is 4450m/min, the one-roll speed is 2180m/min, the one-roll temperature is 75 ℃, the two-roll speed is 2960m/min, the two-roll temperature is 89 ℃, the three-roll speed is 4450m/min, the three-roll temperature is 255 ℃, the four-roll speed is 4500m/min, the four-roll temperature is 255 ℃, the five-roll speed is 4630m/min, the five-roll temperature is 253 ℃, the six-roll speed is 4560m/min, and the six-roll temperature is 253 ℃;
the temperature of the high-viscosity PET melt spinning manifold is 307 ℃, the temperature of the low-viscosity PET melt spinning manifold is 300 ℃, and the temperature of the component spinning manifold is 300 ℃;
the temperature of the relaxation heat treatment is 90 ℃ and the time is 29 min;
the cross section of the finally worthy staggered cross-shaped fiber is
In the shape of a square,
the shape of the model is composed of transverse lines and vertical lines I and II which are vertically connected with the transverse lines, the vertical lines I and II are made of low-viscosity PET, and the transverse lines are made of high-viscosity PET; the staggered cross-shaped fiber has a twisted shape and a twist angle per unit length
126 DEG/10 mu m; the total fineness of the staggered cross-shaped fiber is 2140dtex, the breaking strength is 7.37cN/dtex, the elongation at break is 11.2 percent, and the fiber is at 177 ℃, 10min and 0.05cN/dtexThe dry heat shrinkage under the conditions was 2.03%.
Example 7
A preparation method of a dislocation cross fiber comprises the steps of distributing a high-viscosity PET melt (the intrinsic viscosity is 1.2dL/g) and a low-viscosity PET melt (the intrinsic viscosity is 0.82dL/g) in a mass ratio of 60:40 according to a spinning process, extruding the PET melt from spinneret orifices on the same spinneret plate to obtain industrial yarns, and performing relaxation heat treatment to obtain the dislocation cross fiber;
the spinneret orifice is
The shape of the spinneret orifice is formed,
the shape consists of a transverse line, a vertical line I and a vertical line II which are vertically connected with the transverse line, wherein the intersection point of the vertical line I and the transverse line is positioned at the position of the non-end point of the transverse line, and the intersection point of the vertical line II and the transverse line is positioned at the position of the end point of the transverse line; the length ratio of the vertical line I, the vertical line II and the transverse line is 1:1.9: 3.5; the widths of the vertical line I and the vertical line II are the same as the widths of the horizontal lines; the ratio of the length to the width of the transverse lines is 10: 1; the distance between the vertical line I and the vertical line II is 50 percent of the length of the transverse line;
the distribution means controlling the high-viscosity PET melt to flow through a transverse line and simultaneously controlling the low-viscosity PET melt to flow through a vertical line I and a vertical line II;
a composite spinning assembly is arranged in the assembly spinning box body and comprises a first distribution plate, a second distribution plate, a third distribution plate and a spinneret plate which are tightly attached from top to bottom; the first distribution plate is provided with a runner A1 through which low-viscosity PET melt flows and a runner B1 through which high-viscosity PET melt flows; the second distribution plate is provided with an outer ring groove O2, a middle ring groove M2 and an inner ring groove I2 which are distributed in concentric circles; o2 and I2 are circular grooves which are communicated with each other; m2 is a C-shaped groove and is not communicated with O2 and I2; the third distribution plate is provided with an outer ring groove O3, a middle ring groove M3 and an inner ring groove I3 which are distributed in concentric circles, are not communicated with each other and are circular; the orthographic projection of O2 and O3 completely coincides, the orthographic projection of M2 and M3 completely coincides, and the orthographic projection of I2 and I3 completely coincides; a1 is in communication with O2 and I2, B1 is in communication with M2; o2, M2A plurality of through holes are respectively arranged on the bottoms of the O3, M3, I2 and I3; the surface of the third distribution plate, which is attached to the spinneret plate, is a lower plate surface, a plurality of groups of linear grooves E, grooves F and grooves G are arranged on the lower plate surface, and each group E, F, G is connected into a whole
A groove is shaped, E corresponds to a transverse line, F corresponds to a vertical line I, G corresponds to a vertical line II, through holes in M3 are positioned at two ends of E, a through hole in O3 is positioned at one end of F far away from E, and a through hole in I3 is positioned at one end of G far away from E; on the spinneret plate
Guide hole of spinneret orifice and
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the spinning process flow comprises the following steps: melting → metering → extrusion → cooling → oiling → stretching → heat setting → winding;
the parameters of the spinning process are as follows: the cooling temperature is 23 ℃, the winding speed is 4470m/min, the one-roll speed is 2130m/min, the one-roll temperature is 75 ℃, the two-roll speed is 3480m/min, the two-roll temperature is 93 ℃, the three-roll speed is 4280m/min, the three-roll temperature is 254 ℃, the four-roll speed is 4510m/min, the four-roll temperature is 254 ℃, the five-roll speed is 4650m/min, the five-roll temperature is 250 ℃, the six-roll speed is 4570m/min and the six-roll temperature is 250 ℃;
the temperature of the high-viscosity PET melt spinning manifold is 308 ℃, the temperature of the low-viscosity PET melt spinning manifold is 295 ℃, and the temperature of the component spinning manifold is 305 ℃;
the temperature of the relaxation heat treatment is 116 ℃, and the time is 21 min;
the cross section of the finally worthy staggered cross-shaped fiber is
In the shape of a square,
the shape is composed of a transverse line, a vertical line I and a vertical line II which are vertically connected with the transverse line,the vertical lines I and the vertical lines II are made of low-viscosity PET, and the transverse lines are made of high-viscosity PET; the staggered cross-shaped fiber has a twisted shape and a twist angle per unit length
126 DEG/10 mu m; the total fineness of the staggered crossed fiber is 2460dtex, the breaking strength is 7.52cN/dtex, the elongation at break is 10.8 percent, and the dry heat shrinkage rate under the conditions of 177 ℃, 10min and 0.05cN/dtex is 2.08 percent.
Example 8
A preparation method of a dislocation cross fiber comprises the steps of distributing a high-viscosity PET melt (the intrinsic viscosity is 1.15dL/g) and a low-viscosity PET melt (the intrinsic viscosity is 0.8dL/g) in a mass ratio of 55:45 according to a spinning process, extruding the PET melt from spinneret orifices on the same spinneret plate to obtain industrial yarns, and performing relaxation heat treatment to obtain the dislocation cross fiber;
the spinneret orifice is
The shape of the spinneret orifice is formed,
the shape consists of a transverse line, a vertical line I and a vertical line II which are vertically connected with the transverse line, wherein the intersection point of the vertical line I and the transverse line is positioned at the position of the non-end point of the transverse line, and the intersection point of the vertical line II and the transverse line is positioned at the position of the end point of the transverse line; the length ratio of the vertical line I, the vertical line II and the transverse line is 1:1.8: 3.5; the widths of the vertical line I and the vertical line II are the same as the widths of the horizontal lines; the ratio of the length to the width of the transverse lines is 10: 1; the distance between the vertical line I and the vertical line II is 50 percent of the length of the transverse line;
the distribution means controlling the high-viscosity PET melt to flow through a transverse line and simultaneously controlling the low-viscosity PET melt to flow through a vertical line I and a vertical line II;
a composite spinning assembly is arranged in the assembly spinning box body and comprises a first distribution plate, a second distribution plate, a third distribution plate and a spinneret plate which are tightly attached from top to bottom; the first distribution plate is provided with a runner A1 through which low-viscosity PET melt flows and a runner B1 through which high-viscosity PET melt flows; the second distribution plate is provided with aThe outer ring groove O2, the middle ring groove M2 and the inner ring groove I2 are distributed in concentric circles; o2 and I2 are circular grooves which are communicated with each other; m2 is a C-shaped groove and is not communicated with O2 and I2; the third distribution plate is provided with an outer ring groove O3, a middle ring groove M3 and an inner ring groove I3 which are distributed in concentric circles, are not communicated with each other and are circular; the orthographic projection of O2 and O3 completely coincides, the orthographic projection of M2 and M3 completely coincides, and the orthographic projection of I2 and I3 completely coincides; a1 is in communication with O2 and I2, B1 is in communication with M2; a plurality of through holes are respectively formed in the bottoms of the O2, the M2, the O3, the M3, the I2 and the I3; the surface of the third distribution plate, which is attached to the spinneret plate, is a lower plate surface, a plurality of groups of linear grooves E, grooves F and grooves G are arranged on the lower plate surface, and each group E, F, G is connected into a whole
A groove is shaped, E corresponds to a transverse line, F corresponds to a vertical line I, G corresponds to a vertical line II, through holes in M3 are positioned at two ends of E, a through hole in O3 is positioned at one end of F far away from E, and a through hole in I3 is positioned at one end of G far away from E; on the spinneret plate
Guide hole of spinneret orifice and
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the spinning process flow comprises the following steps: melting → metering → extrusion → cooling → oiling → stretching → heat setting → winding;
the parameters of the spinning process are as follows: the cooling temperature is 20 ℃, the winding speed is 4450m/min, the one-roll speed is 2000m/min, the one-roll temperature is 75 ℃, the two-roll speed is 2800m/min, the two-roll temperature is 85 ℃, the three-roll speed is 4000m/min, the three-roll temperature is 250 ℃, the four-roll speed is 4500m/min, the four-roll temperature is 250 ℃, the five-roll speed is 4630m/min, the five-roll temperature is 250 ℃, the six-roll speed is 4500m/min, and the six-roll temperature is 250 ℃;
the temperature of the high-viscosity PET melt spinning manifold is 305 ℃, the temperature of the low-viscosity PET melt spinning manifold is 295 ℃, and the temperature of the component spinning manifold is 300 ℃;
the temperature of the relaxation heat treatment is 90 ℃ and the time is 30 min;
the cross section of the finally worthy staggered cross-shaped fiber is
In the shape of a square,
the shape of the model is composed of transverse lines and vertical lines I and II which are vertically connected with the transverse lines, the vertical lines I and II are made of low-viscosity PET, and the transverse lines are made of high-viscosity PET; the staggered cross-shaped fiber has a twisted shape and a twist angle per unit length
Is 74 DEG/10 mu m; the total fineness of the staggered crossed fiber is 1500dtex, the breaking strength is 7.7cN/dtex, the elongation at break is 10.5 percent, and the dry heat shrinkage rate under the conditions of 177 ℃, 10min and 0.05cN/dtex is 2.25 percent.
Claims (8)
1. A preparation method of staggered cross-shaped fibers is characterized by comprising the following steps: according to the spinning process, after high-viscosity PET melt and low-viscosity PET melt are distributed, industrial yarns are extruded from spinneret orifices on the same spinneret plate, and relaxation heat treatment is carried out to obtain staggered cross-shaped fibers;
the parameters of the spinning process are as follows: the cooling temperature is 20-25 ℃, the winding speed is 4450-4500 m/min, the one-roll speed is 2000-2600 m/min, the one-roll temperature is 75-80 ℃, the two-roll speed is 2800-3500 m/min, the two-roll temperature is 85-95 ℃, the three-roll speed is 4000-4600 m/min, the three-roll temperature is 250-255 ℃, the four-roll speed is 4500-4600 m/min, the four-roll temperature is 250-255 ℃, the five-roll speed is 4630-4650 m/min, the five-roll temperature is 250-255 ℃, the six-roll speed is 4500-4600 m/min, and the six-roll temperature is 250-255 ℃;
the intrinsic viscosity of the high-viscosity PET melt is 1.15-1.20 dL/g, the temperature of a spinning manifold of the high-viscosity PET melt is 305-310 ℃, the intrinsic viscosity of the low-viscosity PET melt is 0.80-0.85 dL/g, the temperature of a spinning manifold of the low-viscosity PET melt is 295-300 ℃, and the temperature of a spinning manifold of the component is 300-305 ℃;
spinning jetThe hole is
The shape of the spinneret orifice is formed,
the shape consists of a transverse line, a vertical line I and a vertical line II which are vertically connected with the transverse line, wherein the intersection point of the vertical line I and the transverse line is positioned at the position of the non-end point of the transverse line, and the intersection point of the vertical line II and the transverse line is positioned at the position of the end point of the transverse line;
the length ratio of the vertical line I, the vertical line II and the transverse line is 1: 1.8-2.3: 3.5-4.0; the widths of the vertical line I and the vertical line II are the same as the widths of the horizontal lines; the ratio of the length to the width of the transverse line is 10-14: 1; the distance between the vertical line I and the vertical line II is 50 percent of the length of the transverse line;
the distribution refers to controlling the high-viscosity PET melt to flow through a transverse line, and simultaneously controlling the low-viscosity PET melt to flow through a vertical line I and a vertical line II.
2. The preparation method of the staggered cross-shaped fiber as claimed in claim 1, wherein the mass ratio of the high-viscosity PET melt to the low-viscosity PET melt is 55: 45-65: 35.
3. The method for preparing the staggered cross-shaped fiber according to claim 2, wherein a composite spinning assembly is arranged in the assembly spinning box body, and comprises a first distribution plate, a second distribution plate, a third distribution plate and a spinneret plate which are tightly attached from top to bottom;
the first distribution plate is provided with a runner A1 through which low-viscosity PET melt flows and a runner B1 through which high-viscosity PET melt flows;
the second distribution plate is provided with an outer ring groove O2, a middle ring groove M2 and an inner ring groove I2 which are distributed in concentric circles; o2 and I2 are circular grooves which are communicated with each other; m2 is a C-shaped groove and is not communicated with O2 and I2;
the third distribution plate is provided with an outer ring groove O3, a middle ring groove M3 and an inner ring groove I3 which are distributed in concentric circles, are not communicated with each other and are circular;
the orthographic projection of O2 and O3 completely coincides, the orthographic projection of M2 and M3 completely coincides, and the orthographic projection of I2 and I3 completely coincides;
a1 is in communication with O2 and I2, B1 is in communication with M2; a plurality of through holes are respectively formed in the bottoms of the O2, the M2, the O3, the M3, the I2 and the I3;
the surface of the third distribution plate, which is attached to the spinneret plate, is a lower plate surface, a plurality of groups of linear grooves E, grooves F and grooves G are arranged on the lower plate surface, and each group E, F, G is connected into a whole
A groove is shaped, E corresponds to a transverse line, F corresponds to a vertical line I, G corresponds to a vertical line II, through holes in M3 are positioned at two ends of E, a through hole in O3 is positioned at one end of F far away from E, and a through hole in I3 is positioned at one end of G far away from E;
on the spinneret plate
Guide hole of spinneret orifice and
the shape grooves are communicated, and the orthographic projections are completely overlapped.
4. The method for preparing the staggered cross-shaped fiber according to claim 3, wherein the spinning process flow is as follows: melting → metering → extrusion → cooling → oiling → stretching → heat setting → winding.
5. The method for preparing the dislocated cross-shaped fiber according to claim 4, wherein the temperature of the relaxation heat treatment is 99-129 ℃ and the time is 29-39 min.
6. The staggered cross-shaped fiber prepared by the preparation method of the staggered cross-shaped fiber according to any one of claims 1 to 5, which is characterized in that: the cross section of the staggered cross-shaped fiber is
In the shape of a square,
the shape of the model is composed of transverse lines and vertical lines I and II which are vertically connected with the transverse lines, the vertical lines I and II are made of low-viscosity PET, and the transverse lines are made of high-viscosity PET; the dislocated cruciform fiber has a twisted morphology.
7. The dislocated cruciform fiber of claim 6, wherein the twist angle per unit length of the dislocated cruciform fiber is 74-183 °/19 μm.
8. The dislocated cruciform fiber of claim 6, wherein the total fineness of the dislocated cruciform fiber is 1599 to 3999dtex, the breaking strength is not less than 7.9cN/dtex, the elongation at break is 12.9 ± 1.5%, and the dry heat shrinkage rate under the conditions of 177 ℃, 19min and 9.95cN/dtex is 2.9 ± 9.25%.
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