CN111020726B - In-line anti-glare optical fiber and preparation method thereof - Google Patents

In-line anti-glare optical fiber and preparation method thereof Download PDF

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CN111020726B
CN111020726B CN201911410769.XA CN201911410769A CN111020726B CN 111020726 B CN111020726 B CN 111020726B CN 201911410769 A CN201911410769 A CN 201911410769A CN 111020726 B CN111020726 B CN 111020726B
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viscosity pet
distribution hole
spinneret
distribution
hole
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CN111020726A (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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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
    • D01D5/092—Cooling filaments, threads or the like, leaving the spinnerettes in shafts or chimneys
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
    • D01D5/30—Conjugate filaments; Spinnerette packs therefor
    • D01D5/32—Side-by-side structure; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent

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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)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Multicomponent Fibers (AREA)

Abstract

The invention relates to a straight-line anti-glare optical fiber and a preparation method thereof, wherein in the process of preparing circular parallel composite fibers by high-viscosity PET and low-viscosity PET according to an FDY process, spinneret holes on a spinneret plate are changed into a straight line from a circle, circular blowing is adopted for cooling, the arrangement of the spinneret holes on the spinneret plate is controlled to meet a certain condition (the cross section of any one straight-line spinneret hole is taken as a reference, and the cross sections of all other straight-line spinneret holes are randomly rotated from the reference), and the straight-line anti-glare optical fiber is obtained by performing relaxation heat treatment after FDY filaments are prepared; when the parallel composite fiber is prepared, high-viscosity PET melt and low-viscosity PET melt are distributed and then extruded from a spinneret orifice m and a spinneret orifice n on the same spinneret plate; the contact surfaces of the high-viscosity PET melt and the low-viscosity PET melt are parallel to each other when flowing in the guide holes of the spinneret holes. The invention adopts a simple method to prepare the in-line anti-glare optical fiber.

Description

In-line anti-glare optical fiber and preparation method thereof
Technical Field
The invention belongs to the technical field of textile fabrics, and relates to a straight anti-glare optical fiber and a preparation method thereof.
Background
The surface of the glossy fabric is smooth, can reflect bright light and has a sparkling feeling. Such fabrics include satin weave fabrics. Most often used in night dresses or stage performance dresses to produce a gorgeous and dazzling visual effect. The lustrous fabric has wide modeling freedom in performance of the full dress, and can have a concise design or an exaggerated modeling mode. The cross section of the fiber is designed to be in a straight line shape, a triangular shape and the like, so that the fiber can be endowed with high gloss, however, at the same time, the fiber can generate dazzling light, and the requirements of fabrics with special styles cannot be met.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a straight anti-glare optical fiber and a preparation method thereof.
In the process of preparing circular parallel composite fibers from high-viscosity PET and low-viscosity PET according to an FDY process, changing spinneret holes on a spinneret plate from circular to linear, cooling by circular blowing, controlling the arrangement of the spinneret holes on the spinneret plate to meet certain conditions, and performing relaxation heat treatment after FDY filaments are prepared to obtain the linear anti-glare optical fibers;
when the parallel composite fiber is prepared, high-viscosity PET melt and low-viscosity PET melt are distributed and then extruded from a spinneret orifice m and a spinneret orifice n on the same spinneret plate;
the distribution is that the low-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice A, the high-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice B, the low-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice C, and the high-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice D;
at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the high-viscosity PET melt and the low-viscosity PET melt are different by no more than 5%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.30-1.50: 1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.30-1.50;
the spinneret orifices m and the spinneret orifices n are linear spinneret orifices;
the certain conditions are as follows: taking the long symmetrical axis of the cross section of any one linear spinneret orifice as a datum line, and forming a certain included angle between the long symmetrical axis of the cross section of all other linear spinneret orifices and the datum line, wherein the included angles are randomly distributed within the range of 0-360 degrees;
the contact surfaces of the high-viscosity PET melt and the low-viscosity PET melt as they flow in the guide holes of the respective spinneret holes are parallel to each other (the contact surfaces of the high-viscosity PET and the low-viscosity PET are approximately planar due to the apparent viscosities of the two in the guide holes being close to each other).
The invention improves the glossiness of the fiber by adopting the linear spinneret holes, however, the fabric prepared by the linear spinneret holes can generate glare, and in order to prevent the glare, the arrangement of the linear spinneret holes is adjusted, so that the linear spinneret holes rotate by different angles, the regular arrangement of the linear spinneret holes is disturbed, the directions of reflected light on each monofilament are not completely the same when light irradiates on the fiber, diffuse reflection is formed, and further the glare is prevented;
furthermore, in order to endow fiber crimping performance, a parallel spinning method is adopted, low-viscosity PET and high-viscosity PET are simultaneously used as spinning raw materials, however, when the mass ratio of the high-viscosity PET to the low-viscosity PET in the high-viscosity PET/low-viscosity PET parallel composite monofilament is 1:1, the number of rotating angles of a linear spinneret orifice is small, the linear equal division corresponding scheme is small, so that the types of light reflection directions on each monofilament are small, the light reflection in all directions is difficult to realize, in order to solve the problem, the distribution of a melt is specially designed, so that the mass ratio of the high-viscosity PET to the low-viscosity PET in one part of high-viscosity PET/low-viscosity PET parallel composite monofilament is 3: 1-5: 1, the mass ratio of the high-viscosity PET to the low-viscosity PET in the other part of the high-viscosity PET/low-viscosity PET parallel composite monofilament is 1: 3-1: 5, and further, the linear spinneret orifices can rotate at more different rotation angles, the direction variety of reflected light on each monofilament is increased, the diffuse reflection effect is more obvious, and the specific explanation of the relationship between the melt distribution and the mass ratio of the high-viscosity PET to the low-viscosity PET in the monofilament is as follows:
in the spinning process, the spinning melt continuously flows, and in order to better control the flow of the melt, the formula is calculated according to the melt flow of the melt flowing in the circular tube:
Figure BDA0002349905780000021
wherein, Delta Q is the melt flow, d is the diameter of the round tube, mu is the apparent viscosity of the melt at the inlet of the round tube, l is the length of the round tube, and Delta P is the pressure drop of the melt after passing through the round tube, and as can be seen from the formula, when Delta P, mu and l are kept equal, the ratio of the melt flow flowing in the two round tubes is close to the ratio of the fourth power of the diameter of the round tube;
according to the FDY process, after a high-viscosity PET melt and a low-viscosity PET melt are distributed, the high-viscosity PET melt and the low-viscosity PET melt are extruded from a spinneret orifice m and a spinneret orifice n on the same spinneret plate to form the in-line anti-glare optical fiber, wherein the distribution refers to that the high-viscosity PET melt is distributed into the spinneret orifice m through a distribution orifice A, the low-viscosity PET melt is distributed into the spinneret orifice m through a distribution orifice B, the high-viscosity PET melt is distributed into a distribution orifice C, and the low-viscosity PET melt is distributed into the spinneret orifice n through a distribution orifice D;
the ratio of the flow rate of the high-viscosity PET melt flowing through the distribution opening A (or C) to the flow rate of the low-viscosity PET melt flowing through the distribution opening B (or D)
Figure BDA0002349905780000022
Wherein Δ Q1, D1, μ 1, l1, Δ P1 correspond to dispensing hole a (or C), and Δ Q2, D2, μ 2, l2, Δ P2 correspond to dispensing hole B (or D); due to the fact that the intrinsic viscosity of the high-viscosity PET melt, the intrinsic viscosity of the low-viscosity PET melt, the temperature of the spinning manifold I, the temperature of the spinning manifold II and the temperature of the spinning manifold III are matched with each other, the apparent viscosities of the low-viscosity PET melt and the high-viscosity PET melt at the inlets of the distribution hole A and the distribution hole B are approximately consistent (the difference is less than 5%), and the apparent viscosities of the low-viscosity PET melt and the high-viscosity PET melt at the inlets of the distribution hole C and the distribution hole D are approximately consistent (the difference is less than 5%), and therefore mu 1 is approximately equal to mu 2; because the apparent viscosities of the low-viscosity PET melt and the high-viscosity PET melt at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are different by no more than 5%, and the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are all arranged on the distribution plate and are smaller in size, the pressure drop of the high-viscosity PET melt after passing through the distribution hole A is basically the same as that of the low-viscosity PET melt after passing through the distribution hole B, the pressure drop of the high-viscosity PET melt after passing through the distribution hole C is basically the same as that of the low-viscosity PET melt after passing through the distribution hole D, and therefore delta P1 is approximately equal to delta P2; since dispensing hole a and dispensing hole B are equal in height, dispensing hole C and dispensing hole D are equal in height, l1 is equal to l 2;
through the calculation, the method can know that,
Figure BDA0002349905780000031
and
Figure BDA0002349905780000032
are approximately equal due toThe diameter ratio of the distribution hole A to the distribution hole B is 1.30-1.50: 1, so that the ratio of the flow rate of the high-viscosity PET melt flowing through the distribution hole A to the flow rate of the low-viscosity PET melt flowing through the distribution hole B is about 3: 1-5: 1, the mass ratio of the high-viscosity PET melt flowing through the distribution hole C to the low-viscosity PET melt flowing through the distribution hole D is about 3: 1-5: 1, and similarly, the ratio of the diameter of the distribution hole C to the diameter of the distribution hole D is 1: 1.30-1.50, so that the ratio of the high-viscosity PET melt flowing through the distribution hole C to the low-viscosity PET melt flowing through the distribution hole D is about 1: 3-1: 5, and the mass ratio of the high-viscosity PET melt to the low-viscosity PET melt flowing through the filament extruded from the filament spraying hole n is 1: 3-1: 5.
As a preferable scheme:
according to the preparation method of the in-line anti-glare optical fiber, the mass ratio of the high-viscosity PET melt to the low-viscosity PET melt is 50: 50.
According to the preparation method of the in-line anti-glare optical fiber, the spinneret hole m is composed of the guide hole E, the transition hole and the capillary micro hole which are connected in sequence, the spinneret hole n is composed of the guide hole F, the transition hole and the capillary micro hole which are connected in sequence, the guide hole E is connected with the distribution hole A and the distribution hole B at the same time, and the guide hole F is connected with the distribution hole C and the distribution hole D at the same time; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on the distribution plate in the spinning beam body III, the high-viscosity PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning beam body I, and the low-viscosity PET melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam body II.
According to the preparation method of the in-line anti-glare optical fiber, the intrinsic viscosity of the high-viscosity PET melt is 0.75-0.80 dL/g, the temperature of the spinning manifold I is 280-290 ℃, the intrinsic viscosity of the low-viscosity PET melt is 0.50-0.55 dL/g, the temperature of the spinning manifold II is 270-280 ℃, and the temperature of the spinning manifold III (the temperature of the spinning manifold III is the spinning temperature) is 281-285 ℃.
According to the preparation method of the in-line anti-glare optical fiber, the parameters of the FDY process are as follows: the cooling temperature is 23-25 ℃, the network pressure is 0.20-0.30 MPa, the speed of one roller is 2300-2450 m/min, the temperature of one roller is 90-95 ℃, the speed of two rollers is 4200-4400 m/min, the temperature of two rollers is 160-180 ℃, and the winding speed is 4130-4320 m/min.
According to the preparation method of the in-line anti-glare optical fiber, the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
The invention also provides the in-line anti-glare optical fiber prepared by the preparation method of the in-line anti-glare optical fiber, which consists of a plurality of high-viscosity PET/low-viscosity PET parallel composite monofilaments with cross sections in an in-line shape, in the same fiber bundle, the mass ratio of the low-viscosity PET to the high-viscosity PET in one part of the high-viscosity PET/low-viscosity PET parallel composite monofilaments is 3: 1-5: 1, the mass ratio of the low-viscosity PET to the high-viscosity PET in the other part of the high-viscosity PET/low-viscosity PET parallel composite monofilaments is 1: 3-1: 5, and the positions of the high-viscosity PET or the low-viscosity PET in the cross sections of all the high-viscosity PET/low-viscosity PET parallel composite monofilaments are not completely the same; the in-line anti-glare optical fiber has a three-dimensional curling shape, and the curling directions of the monofilaments are randomly distributed.
As a preferable scheme:
according to the in-line anti-glare fiber, the in-line anti-glare fiber has the crimp shrinkage of 48-53%, the crimp stability of 80-83%, the shrinkage elongation of 90-93% and the crimp elastic recovery of 88-92%.
The in-line anti-glare optical fiber has the breaking strength of 2.8-3.2 cN/dtex, the elongation at break of 35.0 +/-3.5%, the filament number of 1.00-2.00 dtex and the glossiness of 40-50%.
Advantageous effects
The preparation method of the in-line anti-glare optical fiber is simple to operate, and the prepared in-line anti-glare optical fiber is excellent in anti-glare effect.
Drawings
FIG. 1 is a schematic view of the melt distribution of the present invention; a, B, C, D are independent distribution holes, E, F are independent guide holes.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The crimp shrinkage and crimp stability of the invention are obtained by testing the tow in GB6506-2001 synthetic fiber textured yarn crimp performance test method;
the method for testing the shrinkage elongation (reflecting the elasticity and the crimp degree of the deformed filament, the fiber is firstly loaded under light load and then loaded under heavy load, and the ratio of the length difference value under the two loads to the crimp length) and the crimp elastic recovery rate is as follows:
firstly, cutting two fiber samples with the length of about 50cm, putting the two fiber samples into hot water with the temperature of 100 ℃ for treatment for 30min, taking out the two fiber samples, naturally drying the two fiber samples, then cutting the sample with the length of about 30cm, fixing one end of the sample, loading a load of 0.0018cN/dtex on the other end of the sample, continuing for 30s, marking the sample at the position of 20cm, and obtaining the initial length l of the sample1(ii) a Then, the load of 0.09cN/dtex is loaded for 30s, and the position of the mark point is measured, namely the length l when the sample is loaded with heavy load2(ii) a Finally, removing the heavy load, retracting the sample for 2min without load, then adding the load of 0.0018cN/dtex, continuing for 30s, and measuring the position of the mark point on the scale, namely the recovery length l3(ii) a The percent elongation at Compression (CE) and the elastic recovery from crimp (SR) are calculated as follows:
CE＝(l2-l1)/l1；
SR＝(l2-l3)/(l2-l1)。
example 1
A preparation method of a straight anti-glare optical fiber comprises the following steps:
(1) preparing FDY yarns by high-viscosity PET (intrinsic viscosity of 0.77dL/g) and low-viscosity PET (intrinsic viscosity of 0.54dL/g) with the mass ratio of 50:50 according to an FDY process and a spinning process of round parallel composite fibers (a spinneret orifice on a spinneret plate is changed from a round shape to a straight shape); wherein,
when the parallel composite fiber is prepared, high-viscosity PET melt and low-viscosity PET melt are distributed and then extruded from a spinneret orifice m (linear spinneret orifice) and a spinneret orifice n (linear spinneret orifice) on the same spinneret plate;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the high-viscosity PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the low-viscosity PET melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II; the temperature of the spinning manifold I is 285 ℃, the temperature of the spinning manifold II is 278 ℃, and the temperature of the spinning manifold III is 284 ℃;
the distribution is that the low-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice A, the high-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice B, the low-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice C, and the high-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice D;
the apparent viscosities of the high-viscosity PET melt and the low-viscosity PET melt at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are different by 4.94%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.4:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.4;
the contact surfaces of the high-viscosity PET melt and the low-viscosity PET melt are parallel to each other when flowing in the guide holes of the spinneret holes;
the parameters of the FDY process are as follows: the cooling temperature is 24 ℃, the network pressure is 0.3MPa, the speed of one roller is 2360m/min, the temperature of one roller is 95 ℃, the speed of two rollers is 4240m/min, the temperature of two rollers is 168 ℃, and the winding speed is 4170 m/min;
cooling by circular blowing and controlling the arrangement of spinneret orifices on a spinneret plate as follows: the spinneret plate is provided with a circle of 30 trilobal spinneret orifices which are distributed equidistantly, the long symmetrical axis of the cross section of any one straight spinneret orifice is taken as a reference line, the long symmetrical axes of the cross sections of all other straight spinneret orifices form a certain included angle with the reference line, and the inferior angle included angles are 174 degrees, 134 degrees, 138 degrees, 165 degrees, 10 degrees, 164 degrees, 103 degrees, 153 degrees, 11 degrees, 91 degrees, 89 degrees, 83 degrees, 78 degrees, 85 degrees, 46 degrees, 56 degrees, 88 degrees, 138 degrees, 8 degrees, 153 degrees, 108 degrees, 47 degrees, 41 degrees, 109 degrees, 48 degrees, 82 degrees, 106 degrees, 145 degrees and 84 degrees in sequence along the clockwise direction;
(2) performing relaxation heat treatment at 102 deg.C for 27min to obtain in-line anti-glare optical fiber;
the prepared in-line anti-glare fiber is characterized in that: the high-viscosity PET/low-viscosity PET composite monofilament is composed of a plurality of high-viscosity PET/low-viscosity PET parallel composite monofilaments with straight-line cross sections, and the positions of the high-viscosity PET or the low-viscosity PET on the cross sections of all the high-viscosity PET/low-viscosity PET parallel composite monofilaments are not completely the same; the in-line anti-glare optical fiber has a three-dimensional curling shape, and the curling directions of monofilaments are randomly distributed;
the in-line anti-glare optical fiber has the crimp shrinkage of 48%, the crimp stability of 81.8%, the shrinkage elongation of 90.3% and the crimp elastic recovery of 88%;
the straight anti-glare optical fiber has the breaking strength of 2.9cN/dtex, the elongation at break of 38.1 percent, the filament number of 1.52dtex and the glossiness of 48 percent.
Example 2
A preparation method of a straight anti-glare optical fiber comprises the following steps:
(1) preparing FDY yarns by high-viscosity PET (intrinsic viscosity of 0.78dL/g) and low-viscosity PET (intrinsic viscosity of 0.55dL/g) with the mass ratio of 50:50 according to an FDY process and a spinning process of round parallel composite fibers (a spinneret orifice on a spinneret plate is changed from a round shape to a straight shape); wherein,
when the parallel composite fiber is prepared, high-viscosity PET melt and low-viscosity PET melt are distributed and then extruded from a spinneret orifice m (linear spinneret orifice) and a spinneret orifice n (linear spinneret orifice) on the same spinneret plate;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the high-viscosity PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the low-viscosity PET melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II; the temperature of the spinning beam I is 288 ℃, the temperature of the spinning beam II is 279 ℃, and the temperature of the spinning beam III is 283 ℃;
the distribution is that the low-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice A, the high-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice B, the low-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice C, and the high-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice D;
the apparent viscosities of the high-viscosity PET melt and the low-viscosity PET melt at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are different by 4.57%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.5:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.5;
the contact surfaces of the high-viscosity PET melt and the low-viscosity PET melt are parallel to each other when flowing in the guide holes of the spinneret holes;
the parameters of the FDY process are as follows: the cooling temperature is 24 ℃, the network pressure is 0.3MPa, the first-roller speed is 2360m/min, the first-roller temperature is 92 ℃, the second-roller speed is 4280m/min, the second-roller temperature is 172 ℃, and the winding speed is 4210 m/min;
cooling by circular blowing and controlling the arrangement of spinneret orifices on a spinneret plate as follows: the spinneret plate is provided with a circle of trilobal spinneret orifices which are distributed equidistantly, the number of the trilobal spinneret orifices is 48, the long symmetrical axis of the cross section of any one straight spinneret orifice is taken as a reference line, the long symmetrical axes of the cross sections of all other straight spinneret orifices form a certain included angle with the reference line, and the inferior angle included angles are 89 degrees, 60 degrees, 141 degrees, 86 degrees, 9 degrees, 122 degrees, 16 degrees, 25 degrees, 156 degrees, 106 degrees, 161 degrees, 49 degrees, 54 degrees, 46 degrees, 51 degrees, 7 degrees, 54 degrees, 26 degrees, 90 degrees, 98 degrees, 71 degrees, 12 degrees, 40 degrees, 35 degrees, 150 degrees, 78 degrees, 106 degrees, 70 degrees, 144 degrees, 122 degrees, 88 degrees, 150 degrees, 34 degrees, 92 degrees, 145 degrees, 164 degrees, 121 degrees, 151 degrees, 177 degrees, 73 degrees, 56 degrees, 94 degrees, 134 degrees, 158 degrees and 114 degrees in sequence along the clockwise direction;
(2) performing relaxation heat treatment at 114 deg.C for 23min to obtain in-line anti-glare optical fiber;
the prepared in-line anti-glare fiber is characterized in that: the high-viscosity PET/low-viscosity PET composite monofilament is composed of a plurality of high-viscosity PET/low-viscosity PET parallel composite monofilaments with straight-line cross sections, and the positions of the high-viscosity PET or the low-viscosity PET on the cross sections of all the high-viscosity PET/low-viscosity PET parallel composite monofilaments are not completely the same; the in-line anti-glare optical fiber has a three-dimensional curling shape, and the curling directions of monofilaments are randomly distributed;
the in-line anti-glare optical fiber has the crimp shrinkage of 48%, the crimp stability of 80.7%, the shrinkage elongation of 92.3% and the crimp elastic recovery of 89%;
the in-line anti-glare optical fiber has the breaking strength of 2.96cN/dtex, the elongation at break of 35.2 percent, the filament number of 1.33dtex and the glossiness of 42 percent.
Example 3
A preparation method of a straight anti-glare optical fiber comprises the following steps:
(1) preparing FDY yarns by high-viscosity PET (intrinsic viscosity of 0.77dL/g) and low-viscosity PET (intrinsic viscosity of 0.53dL/g) with the mass ratio of 50:50 according to an FDY process and a spinning process of circular parallel composite fibers (the spinneret orifices on a spinneret plate are changed from circular to in-line); wherein,
when the parallel composite fiber is prepared, high-viscosity PET melt and low-viscosity PET melt are distributed and then extruded from a spinneret orifice m (linear spinneret orifice) and a spinneret orifice n (linear spinneret orifice) on the same spinneret plate;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the high-viscosity PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the low-viscosity PET melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II; the temperature of the spinning manifold I is 285 ℃, the temperature of the spinning manifold II is 275 ℃, and the temperature of the spinning manifold III is 281 ℃;
the distribution is that the low-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice A, the high-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice B, the low-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice C, and the high-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice D;
the apparent viscosities of the high-viscosity PET melt and the low-viscosity PET melt at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are different by 4.91%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.3:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.3;
the contact surfaces of the high-viscosity PET melt and the low-viscosity PET melt are parallel to each other when flowing in the guide holes of the spinneret holes;
the parameters of the FDY process are as follows: cooling temperature 25 deg.C, network pressure 0.3MPa, one-roller speed 2330m/min, one-roller temperature 90 deg.C, two-roller speed 4210m/min, two-roller temperature 173 deg.C, winding speed 4140 m/min;
cooling by circular blowing and controlling the arrangement of spinneret orifices on a spinneret plate as follows: the spinneret plate is provided with a circle of trilobal spinneret orifices which are distributed equidistantly, the number of the trilobal spinneret orifices is 48, the long symmetrical axis of the cross section of any one straight spinneret orifice is taken as a datum line, the long symmetrical axes of the cross sections of all other straight spinneret orifices form a certain included angle with the datum line, and the inferior angle included angle is 171 degrees, 158 degrees, 152 degrees, 118 degrees, 38 degrees, 77 degrees, 3 degrees, 142 degrees, 113 degrees, 131 degrees, 37 degrees, 89 degrees, 160 degrees, 141 degrees, 86 degrees, 9 degrees, 122 degrees, 116 degrees, 125 degrees, 156 degrees, 106 degrees, 161 degrees, 89 degrees, 158 degrees, 152 degrees, 118 degrees, 38 degrees, 77 degrees, 3 degrees, 142 degrees, 113 degrees, 131 degrees, 173 degrees, 89 degrees, 160 degrees, 141 degrees, 86 degrees, 9 degrees, 122 degrees, 116 degrees, 125 degrees, 156 degrees, 106 degrees, 161 degrees and 89 degrees along the clockwise direction;
(2) performing relaxation heat treatment at 92 deg.C for 29min to obtain in-line anti-glare optical fiber;
the prepared in-line anti-glare fiber is characterized in that: the high-viscosity PET/low-viscosity PET composite monofilament is composed of a plurality of high-viscosity PET/low-viscosity PET parallel composite monofilaments with straight-line cross sections, and the positions of the high-viscosity PET or the low-viscosity PET on the cross sections of all the high-viscosity PET/low-viscosity PET parallel composite monofilaments are not completely the same; the in-line anti-glare optical fiber has a three-dimensional curling shape, and the curling directions of monofilaments are randomly distributed;
the in-line anti-glare optical fiber has the crimp shrinkage of 48%, the crimp stability of 82.6%, the shrinkage elongation of 91% and the crimp elastic recovery of 90%;
the in-line anti-glare optical fiber has the breaking strength of 2.8cN/dtex, the elongation at break of 38.5 percent, the filament number of 1.71dtex and the glossiness of 49 percent.
Example 4
A preparation method of a straight anti-glare optical fiber comprises the following steps:
(1) preparing FDY yarns by high-viscosity PET (intrinsic viscosity of 0.77dL/g) and low-viscosity PET (intrinsic viscosity of 0.53dL/g) with the mass ratio of 50:50 according to an FDY process and a spinning process of circular parallel composite fibers (the spinneret orifices on a spinneret plate are changed from circular to in-line); wherein,
when the parallel composite fiber is prepared, high-viscosity PET melt and low-viscosity PET melt are distributed and then extruded from a spinneret orifice m (linear spinneret orifice) and a spinneret orifice n (linear spinneret orifice) on the same spinneret plate;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the high-viscosity PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the low-viscosity PET melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II; the temperature of the spinning manifold I is 287 ℃, the temperature of the spinning manifold II is 276 ℃, and the temperature of the spinning manifold III is 283 ℃;
the distribution is that the low-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice A, the high-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice B, the low-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice C, and the high-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice D;
the apparent viscosities of the high-viscosity PET melt and the low-viscosity PET melt at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are different by 4.57%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.5:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.5;
the contact surfaces of the high-viscosity PET melt and the low-viscosity PET melt are parallel to each other when flowing in the guide holes of the spinneret holes;
the parameters of the FDY process are as follows: the cooling temperature is 24 ℃, the network pressure is 0.2MPa, the first-roller speed is 2310m/min, the first-roller temperature is 90 ℃, the second-roller speed is 4310m/min, the second-roller temperature is 162 ℃, and the winding speed is 4240 m/min;
cooling by circular blowing and controlling the arrangement of spinneret orifices on a spinneret plate as follows: the spinneret plate is provided with a circle of trilobal spinneret orifices which are distributed equidistantly, the number of the trilobal spinneret orifices is 24, the long symmetrical axis of the cross section of any one straight spinneret orifice is taken as a reference line, the long symmetrical axes of the cross sections of all other straight spinneret orifices form a certain included angle with the reference line, and the inferior angle included angles along the clockwise direction are 179 degrees, 95 degrees, 25 degrees, 20 degrees, 125 degrees, 167 degrees, 109 degrees, 148 degrees, 82 degrees, 106 degrees, 145 degrees, 171 degrees, 158 degrees, 152 degrees, 118 degrees, 38 degrees, 77 degrees, 3 degrees, 142 degrees, 113 degrees, 131 degrees, 37 degrees and 173 degrees in sequence;
(2) performing relaxation heat treatment at 97 deg.C for 28min to obtain in-line anti-glare optical fiber;
the prepared in-line anti-glare fiber is characterized in that: the high-viscosity PET/low-viscosity PET composite monofilament is composed of a plurality of high-viscosity PET/low-viscosity PET parallel composite monofilaments with straight-line cross sections, and the positions of the high-viscosity PET or the low-viscosity PET on the cross sections of all the high-viscosity PET/low-viscosity PET parallel composite monofilaments are not completely the same; the in-line anti-glare optical fiber has a three-dimensional curling shape, and the curling directions of monofilaments are randomly distributed;
the in-line anti-glare optical fiber has a crimp shrinkage of 49%, a crimp stability of 80.5%, a shrinkage elongation of 90.8%, and a crimp elastic recovery of 90%;
the in-line anti-glare optical fiber has the breaking strength of 3.17cN/dtex, the elongation at break of 32.5 percent, the filament number of 1.40dtex and the glossiness of 43 percent.
Example 5
A preparation method of a straight anti-glare optical fiber comprises the following steps:
(1) preparing FDY yarns by high-viscosity PET (intrinsic viscosity of 0.8dL/g) and low-viscosity PET (intrinsic viscosity of 0.55dL/g) with the mass ratio of 50:50 according to an FDY process and a spinning process of round parallel composite fibers (a spinneret orifice on a spinneret plate is changed from a round shape to a straight shape); wherein,
when the parallel composite fiber is prepared, high-viscosity PET melt and low-viscosity PET melt are distributed and then extruded from a spinneret orifice m (linear spinneret orifice) and a spinneret orifice n (linear spinneret orifice) on the same spinneret plate;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the high-viscosity PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the low-viscosity PET melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II; the temperature of the spinning manifold I is 290 ℃, the temperature of the spinning manifold II is 280 ℃, and the temperature of the spinning manifold III is 285 ℃;
the distribution is that the low-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice A, the high-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice B, the low-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice C, and the high-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice D;
the apparent viscosities of the high-viscosity PET melt and the low-viscosity PET melt at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are different by 4.98%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.5:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.5;
the contact surfaces of the high-viscosity PET melt and the low-viscosity PET melt are parallel to each other when flowing in the guide holes of the spinneret holes;
the parameters of the FDY process are as follows: the cooling temperature is 25 ℃, the network pressure is 0.3MPa, the speed of one roller is 2450m/min, the temperature of one roller is 95 ℃, the speed of two rollers is 4400m/min, the temperature of two rollers is 180 ℃, and the winding speed is 4320 m/min;
cooling by circular blowing and controlling the arrangement of spinneret orifices on a spinneret plate as follows: the spinneret plate is provided with a circle of trilobal spinneret orifices which are distributed equidistantly, the number of the trilobal spinneret orifices is 24, the long symmetrical axis of the cross section of any one straight spinneret orifice is taken as a reference line, the long symmetrical axes of the cross sections of all other straight spinneret orifices form a certain included angle with the reference line, and the inferior angle included angles along the clockwise direction are 94 degrees, 134 degrees, 38 degrees, 65 degrees, 30 degrees, 94 degrees, 103 degrees, 53 degrees, 11 degrees, 91 degrees, 89 degrees, 83 degrees, 85 degrees, 46 degrees, 156 degrees, 88 degrees, 138 degrees, 108 degrees, 153 degrees, 108 degrees, 147 degrees, 41 degrees and 121 degrees in sequence;
(2) performing relaxation heat treatment at 120 deg.C for 20min to obtain in-line anti-glare optical fiber;
the prepared in-line anti-glare fiber is characterized in that: the high-viscosity PET/low-viscosity PET composite monofilament is composed of a plurality of high-viscosity PET/low-viscosity PET parallel composite monofilaments with straight-line cross sections, and the positions of the high-viscosity PET or the low-viscosity PET on the cross sections of all the high-viscosity PET/low-viscosity PET parallel composite monofilaments are not completely the same; the in-line anti-glare optical fiber has a three-dimensional curling shape, and the curling directions of monofilaments are randomly distributed;
the in-line anti-glare optical fiber has the crimp shrinkage of 50%, the crimp stability of 83%, the shrinkage elongation of 93% and the crimp elastic recovery of 91%;
the straight anti-glare optical fiber has the breaking strength of 3.12cN/dtex, the elongation at break of 32.7 percent, the filament number of 2.00dtex and the glossiness of 50 percent.
Example 6
A preparation method of a straight anti-glare optical fiber comprises the following steps:
(1) preparing FDY yarns by high-viscosity PET (intrinsic viscosity of 0.75dL/g) and low-viscosity PET (intrinsic viscosity of 0.5dL/g) with the mass ratio of 50:50 according to an FDY process and a spinning process of round parallel composite fibers (a spinneret orifice on a spinneret plate is changed from a round shape to a straight shape); wherein,
when the parallel composite fiber is prepared, high-viscosity PET melt and low-viscosity PET melt are distributed and then extruded from a spinneret orifice m (linear spinneret orifice) and a spinneret orifice n (linear spinneret orifice) on the same spinneret plate;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the high-viscosity PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the low-viscosity PET melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II; the temperature of the spinning manifold I is 280 ℃, the temperature of the spinning manifold II is 270 ℃, and the temperature of the spinning manifold III is 281 ℃;
the distribution is that the low-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice A, the high-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice B, the low-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice C, and the high-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice D;
the apparent viscosities of the high-viscosity PET melt and the low-viscosity PET melt at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are different by 4.48%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.3:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.3;
the contact surfaces of the high-viscosity PET melt and the low-viscosity PET melt are parallel to each other when flowing in the guide holes of the spinneret holes;
the parameters of the FDY process are as follows: the cooling temperature is 23 ℃, the network pressure is 0.2MPa, the one-roll speed is 2300m/min, the one-roll temperature is 90 ℃, the two-roll speed is 4200m/min, the two-roll temperature is 160 ℃, and the winding speed is 4130 m/min;
cooling by circular blowing and controlling the arrangement of spinneret orifices on a spinneret plate as follows: the spinneret plate is provided with a circle of trilobal spinneret orifices which are distributed equidistantly, the number of the trilobal spinneret orifices is 24, the long symmetrical axis of the cross section of any one straight spinneret orifice is taken as a reference line, the long symmetrical axes of the cross sections of all other straight spinneret orifices form a certain included angle with the reference line, and the inferior angle included angles are 145 degrees, 164 degrees, 121 degrees, 151 degrees, 177 degrees, 73 degrees, 56 degrees, 94 degrees, 134 degrees, 77 degrees, 158 degrees, 94 degrees, 134 degrees, 138 degrees, 165 degrees, 60 degrees, 94 degrees, 103 degrees, 153 degrees, 11 degrees, 91 degrees, 89 degrees and 83 degrees in sequence along the clockwise direction;
(2) performing relaxation heat treatment at 90 deg.C for 30min to obtain in-line anti-glare optical fiber;
the prepared in-line anti-glare fiber is characterized in that: the high-viscosity PET/low-viscosity PET composite monofilament is composed of a plurality of high-viscosity PET/low-viscosity PET parallel composite monofilaments with straight-line cross sections, and the positions of the high-viscosity PET or the low-viscosity PET on the cross sections of all the high-viscosity PET/low-viscosity PET parallel composite monofilaments are not completely the same; the in-line anti-glare optical fiber has a three-dimensional curling shape, and the curling directions of monofilaments are randomly distributed;
the in-line anti-glare optical fiber has the crimp shrinkage of 51%, the crimp stability of 80%, the shrinkage elongation of 90% and the crimp elastic recovery of 91%;
the in-line anti-glare optical fiber has the breaking strength of 2.91cN/dtex, the elongation at break of 36 percent, the filament number of 1.00dtex and the glossiness of 40 percent.
Example 7
A preparation method of a straight anti-glare optical fiber comprises the following steps:
(1) preparing FDY yarns by high-viscosity PET (intrinsic viscosity of 0.78dL/g) and low-viscosity PET (intrinsic viscosity of 0.52dL/g) with the mass ratio of 50:50 according to an FDY process and a spinning process of circular parallel composite fibers (a spinneret orifice on a spinneret plate is changed from a circle to a straight line); wherein,
when the parallel composite fiber is prepared, high-viscosity PET melt and low-viscosity PET melt are distributed and then extruded from a spinneret orifice m (linear spinneret orifice) and a spinneret orifice n (linear spinneret orifice) on the same spinneret plate;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the high-viscosity PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the low-viscosity PET melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II; the temperature of the spinning manifold I is 289 ℃, the temperature of the spinning manifold II is 274 ℃, and the temperature of the spinning manifold III is 282 ℃;
the distribution is that the low-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice A, the high-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice B, the low-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice C, and the high-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice D;
the apparent viscosities of the high-viscosity PET melt and the low-viscosity PET melt at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are different by 4.94%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.5:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.5;
the contact surfaces of the high-viscosity PET melt and the low-viscosity PET melt are parallel to each other when flowing in the guide holes of the spinneret holes;
the parameters of the FDY process are as follows: the cooling temperature is 23 ℃, the network pressure is 0.3MPa, the one-roller speed is 2320m/min, the one-roller temperature is 95 ℃, the two-roller speed is 4250m/min, the two-roller temperature is 175 ℃, and the winding speed is 4180 m/min;
cooling by circular blowing and controlling the arrangement of spinneret orifices on a spinneret plate as follows: the spinneret plate is provided with a circle of trilobal spinneret orifices which are distributed equidistantly, the number of the trilobal spinneret orifices is 24, the long symmetrical axis of the cross section of any one straight spinneret orifice is taken as a datum line, the long symmetrical axes of the cross sections of all other straight spinneret orifices form a certain included angle with the datum line, and along the clockwise direction, the inferior angle included angles are 89 degrees, 160 degrees, 141 degrees, 86 degrees, 9 degrees, 122 degrees, 116 degrees, 125 degrees, 156 degrees, 106 degrees, 161 degrees, 49 degrees, 54 degrees, 46 degrees, 173 degrees, 51 degrees, 7 degrees, 54 degrees, 126 degrees, 90 degrees, 98 degrees, 71 degrees and 112 degrees in sequence;
(2) performing relaxation heat treatment at 113 ℃ for 23min to obtain the in-line anti-glare optical fiber;
the prepared in-line anti-glare fiber is characterized in that: the high-viscosity PET/low-viscosity PET composite monofilament is composed of a plurality of high-viscosity PET/low-viscosity PET parallel composite monofilaments with straight-line cross sections, and the positions of the high-viscosity PET or the low-viscosity PET on the cross sections of all the high-viscosity PET/low-viscosity PET parallel composite monofilaments are not completely the same; the in-line anti-glare optical fiber has a three-dimensional curling shape, and the curling directions of monofilaments are randomly distributed;
the in-line anti-glare optical fiber has the crimp shrinkage of 52%, the crimp stability of 80.8%, the shrinkage elongation of 92% and the crimp elastic recovery of 92%;
the straight anti-glare optical fiber has the breaking strength of 3.11cN/dtex, the elongation at break of 32.7 percent, the filament number of 1.63dtex and the glossiness of 50 percent.
Example 8
A preparation method of a straight anti-glare optical fiber comprises the following steps:
(1) preparing FDY yarns by high-viscosity PET (intrinsic viscosity of 0.76dL/g) and low-viscosity PET (intrinsic viscosity of 0.5dL/g) with the mass ratio of 50:50 according to an FDY process and a spinning process of round parallel composite fibers (a spinneret orifice on a spinneret plate is changed from a round shape to a straight shape); wherein,
when the parallel composite fiber is prepared, high-viscosity PET melt and low-viscosity PET melt are distributed and then extruded from a spinneret orifice m (linear spinneret orifice) and a spinneret orifice n (linear spinneret orifice) on the same spinneret plate;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the high-viscosity PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the low-viscosity PET melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II; the temperature of the spinning beam I is 283 ℃, the temperature of the spinning beam II is 272 ℃, and the temperature of the spinning beam III is 284 ℃;
the distribution is that the low-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice A, the high-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice B, the low-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice C, and the high-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice D;
the apparent viscosities of the high-viscosity PET melt and the low-viscosity PET melt at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are different by 4.62%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.3:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.3;
the contact surfaces of the high-viscosity PET melt and the low-viscosity PET melt are parallel to each other when flowing in the guide holes of the spinneret holes;
the parameters of the FDY process are as follows: the cooling temperature is 25 ℃, the network pressure is 0.2MPa, the first-roller speed is 2360m/min, the first-roller temperature is 90 ℃, the second-roller speed is 4390m/min, the second-roller temperature is 160 ℃, and the winding speed is 4320 m/min;
cooling by circular blowing and controlling the arrangement of spinneret orifices on a spinneret plate as follows: the spinneret plate is provided with a circle of trilobal spinneret orifices which are distributed equidistantly, the number of the trilobal spinneret orifices is 24, the long symmetrical axis of the cross section of any one straight spinneret orifice is taken as a datum line, the long symmetrical axes of the cross sections of all other straight spinneret orifices form a certain included angle with the datum line, and along the clockwise direction, the inferior angle included angles are 79 degrees, 95 degrees, 25 degrees, 50 degrees, 125 degrees, 167 degrees, 109 degrees, 148 degrees, 82 degrees, 106 degrees, 145 degrees, 84 degrees, 158 degrees, 152 degrees, 118 degrees, 38 degrees, 77 degrees, 3 degrees, 142 degrees, 113 degrees, 131 degrees, 37 degrees and 173 degrees in sequence;
(2) performing relaxation heat treatment at 112 deg.C for 24min to obtain in-line anti-glare optical fiber;
the prepared in-line anti-glare fiber is characterized in that: the high-viscosity PET/low-viscosity PET composite monofilament is composed of a plurality of high-viscosity PET/low-viscosity PET parallel composite monofilaments with straight-line cross sections, and the positions of the high-viscosity PET or the low-viscosity PET on the cross sections of all the high-viscosity PET/low-viscosity PET parallel composite monofilaments are not completely the same; the in-line anti-glare optical fiber has a three-dimensional curling shape, and the curling directions of monofilaments are randomly distributed;
the in-line anti-glare optical fiber has a crimp shrinkage of 53%, a crimp stability of 82%, a shrinkage elongation of 90.2%, and a crimp elastic recovery of 92%;
the straight anti-glare optical fiber has the breaking strength of 3.2cN/dtex, the elongation at break of 31.5 percent, the filament number of 1.64dtex and the glossiness of 48 percent.

Claims (9)

1. A preparation method of a straight anti-glare optical fiber is characterized by comprising the following steps: in the process of preparing circular parallel composite fibers from high-viscosity PET and low-viscosity PET according to an FDY process, changing spinneret orifices on a spinneret plate from circular to linear, cooling by circular blowing, controlling the arrangement of the spinneret orifices on the spinneret plate to meet certain conditions, and performing relaxation heat treatment to obtain linear anti-glare optical fibers after FDY filaments are prepared;
the in-line anti-glare optical fiber has a three-dimensional curling shape, and the curling directions of monofilaments are randomly distributed;
when the parallel composite fiber is prepared, high-viscosity PET melt and low-viscosity PET melt are distributed and then extruded from a spinneret orifice m and a spinneret orifice n on the same spinneret plate;
the distribution is that the low-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice A, the high-viscosity PET melt is distributed into a spinneret orifice m through a distribution orifice B, the low-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice C, and the high-viscosity PET melt is distributed into a spinneret orifice n through a distribution orifice D;
at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the high-viscosity PET melt and the low-viscosity PET melt are different by no more than 5%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.30-1.50: 1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.30-1.50;
the spinneret orifices m and the spinneret orifices n are linear spinneret orifices;
the certain conditions are as follows: taking the long symmetrical axis of the cross section of any one linear spinneret orifice as a datum line, and forming a certain included angle between the long symmetrical axis of the cross section of all other linear spinneret orifices and the datum line, wherein the included angles are randomly distributed within the range of 0-360 degrees;
the contact surfaces of the high-viscosity PET melt and the low-viscosity PET melt are parallel to each other when flowing in the guide holes of the spinneret holes.
2. The method of claim 1, wherein the ratio of the high viscosity PET melt to the low viscosity PET melt is 50:50 by mass.
3. The method for preparing an in-line anti-glare optical fiber according to claim 2, wherein the spinneret hole m is composed of a guide hole E, a transition hole and a capillary hole which are connected in sequence, the spinneret hole n is composed of a guide hole F, a transition hole and a capillary hole which are connected in sequence, the guide hole E is connected with the distribution hole A and the distribution hole B at the same time, and the guide hole F is connected with the distribution hole C and the distribution hole D at the same time; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on the distribution plate in the spinning beam body III, the high-viscosity PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning beam body I, and the low-viscosity PET melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam body II.
4. The preparation method of the in-line anti-glare optical fiber according to claim 3, wherein the intrinsic viscosity of the high-viscosity PET melt is 0.75-0.80 dL/g, the temperature of the spinning beam I is 280-290 ℃, the intrinsic viscosity of the low-viscosity PET melt is 0.50-0.55 dL/g, the temperature of the spinning beam II is 270-280 ℃, and the temperature of the spinning beam III is 281-285 ℃.
5. The method of claim 4, wherein the FDY process parameters are as follows: the cooling temperature is 23-25 ℃, the network pressure is 0.20-0.30 MPa, the speed of one roller is 2300-2450 m/min, the temperature of one roller is 90-95 ℃, the speed of two rollers is 4200-4400 m/min, the temperature of two rollers is 160-180 ℃, and the winding speed is 4130-4320 m/min.
6. The method for preparing an in-line anti-glare optical fiber according to claim 5, wherein the temperature of the relaxation heat treatment is 90 to 120 ℃ for 20 to 30 min.
7. The in-line antiglare optical fiber prepared by the method according to any one of claims 1 to 6, comprising: the single-fiber composite filament comprises a plurality of high-viscosity PET/low-viscosity PET parallel composite monofilaments with straight-line cross sections, in the same fiber bundle, the mass ratio of the low-viscosity PET to the high-viscosity PET in one part of the high-viscosity PET/low-viscosity PET parallel composite monofilaments is 3: 1-5: 1, the mass ratio of the low-viscosity PET to the high-viscosity PET in the other part of the high-viscosity PET/low-viscosity PET parallel composite monofilaments is 1: 3-1: 5, and the positions of the high-viscosity PET or the low-viscosity PET in the cross sections of all the high-viscosity PET/low-viscosity PET parallel composite monofilaments are not identical.
8. The in-line antiglare optical fiber of claim 7, wherein the in-line antiglare optical fiber has a crimp shrinkage of 48 to 53%, a crimp stability of 80 to 83%, a shrinkage elongation of 90 to 93%, and a crimp elastic recovery of 88 to 92%.
9. The in-line antiglare optical fiber according to claim 7, wherein the in-line antiglare optical fiber has a breaking strength of 2.8 to 3.2cN/dtex, an elongation at break of 35.0 ± 3.5%, a single fiber fineness of 1.00 to 2.00dtex, and a gloss of 40 to 50%.
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CN2716297Y (en) * 2004-05-23 2005-08-10 张志明 Multi-center special-shaped fiber and spinning nozzle special for producing same
CN101328619A (en) * 2008-07-25 2008-12-24 江苏恒力化纤有限公司 Method for manufacturing bright linear polyester filament
CN102978724A (en) * 2012-12-21 2013-03-20 东华大学 Dual-component parallel composite fiber and preparation method thereof
CN104805517B (en) * 2015-02-15 2017-02-01 东华大学 Two-component composite modified imitated fluff flash fiber and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02221414A (en) * 1989-02-23 1990-09-04 Mitsubishi Rayon Co Ltd Conjugated fiber yarn
CN2716297Y (en) * 2004-05-23 2005-08-10 张志明 Multi-center special-shaped fiber and spinning nozzle special for producing same
CN101328619A (en) * 2008-07-25 2008-12-24 江苏恒力化纤有限公司 Method for manufacturing bright linear polyester filament
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CN104805517B (en) * 2015-02-15 2017-02-01 东华大学 Two-component composite modified imitated fluff flash fiber and preparation method thereof

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