CN111055612A - Preparation method of writing brush - Google Patents

Preparation method of writing brush Download PDF

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Publication number
CN111055612A
CN111055612A CN201911403133.2A CN201911403133A CN111055612A CN 111055612 A CN111055612 A CN 111055612A CN 201911403133 A CN201911403133 A CN 201911403133A CN 111055612 A CN111055612 A CN 111055612A
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Prior art keywords
vertical line
viscosity
melt
line
writing brush
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CN201911403133.2A
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Chinese (zh)
Inventor
邴海军
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Shenzhen Hongxiang New Material Development Co Ltd
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Shenzhen Hongxiang New Material Development Co Ltd
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Priority to CN201911403133.2A priority Critical patent/CN111055612A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K15/00—Assembling, finishing, or repairing pens
    • B43K15/02—Automatic machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K8/00—Pens with writing-points other than nibs or balls
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D01D4/06—Distributing spinning solution or melt to spinning nozzles
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/12—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyamide as constituent

Abstract

The invention relates to a preparation method of a writing brush, which comprises the steps of mixing fibrilia and self-twisted fibers, softening, trimming, bundling and then filling the mixture into a pen holder to prepare the writing brush; the preparation process of the self-twisted fiber comprises the following steps: according to the FDY process, after a high-viscosity PA6 melt and a low-viscosity PA6 melt are distributed, FDY filaments are extruded from spinneret orifices on the same spinneret plate, and relaxation heat treatment is carried out to obtain self-twisted fibers; the spinneret orifice is
Figure DDA0002347938890000011
The shape of the spinneret orifice is formed,
Figure DDA0002347938890000012
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; partitioning refers to controlling the flow of high viscosity PA6 melt through the transverse line while controlling the flow of low viscosity PA6 melt through the vertical lines I and II. The preparation method is simple, and the prepared writing brush has high water absorption rate and high water diversion speed.

Description

Preparation method of writing brush
Technical Field
The invention belongs to the technical field of fibers, and relates to a preparation method of a writing brush.
Background
The traditional brush pen uses animal hair, which can be divided into: the animal hair protection brush is characterized by comprising a fetal brush pen, a wolf brush pen, a rabbit-shoulder purple hair pen, a deer brush pen, a chicken brush pen, a duck brush pen, a goat brush pen, a pig brush pen, a mouse brush pen, a tiger brush pen, a cattle-ear hao pen and the like. Although the prior art has a writing brush using synthetic fibers to replace animal hair, the problems of low water absorption rate and low water diversion speed generally exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a writing brush with high water absorption rate and high water diversion speed.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a writing brush comprises the steps of mixing fibrilia and self-twisted fibers, softening, trimming, bundling and then putting the mixture into a pen holder to prepare the writing brush;
the filament number of the self-twisted fiber is 3.0-5.8 dtex, and the preparation process is as follows:
according to the FDY process, after a high-viscosity PA6 melt and a low-viscosity PA6 melt are distributed, FDY filaments are extruded from spinneret orifices on the same spinneret plate, and relaxation heat treatment is carried out to obtain self-twisted fibers;
the spinneret orifice is
Figure BDA0002347938870000011
The shape of the spinneret orifice is formed,
Figure BDA0002347938870000012
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 II to the vertical line I to the horizontal line is 1: 1.8-2.3: 3.5-4.0; the width ratio of the vertical line I to the vertical line II is 1: 1.5-2.0, and the widths of the vertical line I and the horizontal line are the same; 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 is such that the flow of high viscosity PA6 melt is controlled through the transverse line while the flow of low viscosity PA6 melt is controlled through the vertical lines I and II.
The forces of the fibers and water molecules are different due to the difference in the structure and surface composition of the fibers, and thus the difference in the water absorption amount and water delivery rate of the fiber assembly composed of different fibers is caused. The liquid absorption by the fiber comprises four processes: (1) wetting, i.e., the fiber surface and liquid contact each other, which is related to the nature of the fiber itself, surface energy level and roughness of the outer surface; (2) wicking, i.e., liquid initially enters the internal voids of the fibers, which are all non-solid and porous, interfacial tension exists between the liquid and the fibers, and the internal voids of the fibrous textile material exert a pressure on the liquid, which automatically allows the liquid to enter the internal voids of the fibers from the outer surface of the fibrous material; (3) expanding; (4) saturation, the liquid fills the entire fiber interior, which depends mainly on how many voids are inside the fiber, the size of the voids. A sufficiently thin tube is inserted into a container containing a wetting liquid, which will rise to a certain height from the bottom of the tube without external force and remain at this height, which is the capillary wicking effect.
The shape and the size of the spinneret orifice are reasonably designed, so that the fibers are twisted, the contact mode between the fibers is changed, the surface contact is changed into point contact, the point contact is more favorable for forming a large number of tiny pores with capillary size grade between the monofilaments relative to the surface contact, the capillary attraction is increased, the water absorption rate and the water diversion speed are favorably improved, and meanwhile, the fibers are twisted, the surface area of the fibers in unit length is obviously increased, the fibers can be contacted with more water, and the water absorption rate and the water diversion speed are further improved. The twisting mechanism is as follows:
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
Figure BDA0002347938870000021
The shape of the spinneret orifice is formed,
Figure BDA0002347938870000022
the shape of the vertical line I is formed by a transverse line and a vertical line I and a vertical line II which are vertically connected with the transverse line, 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 smaller than that of the vertical line II, the length of the vertical line I is larger 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 PA6, and the transverse line I and the vertical line II are made of high-viscosity PA 6;
at the position where the vertical line I or the vertical line II is contacted with the transverse line, two internal stresses in opposite directions exist simultaneously, the internal stress in one direction is derived from the high viscosity PA6, the internal stress in the other direction is derived from the low viscosity PA6, and the internal stresses in the two opposite directions mutually counteract 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 PA6 is greater than that of the high-viscosity PA6, the final direction of the internal stress points to the vertical line I at the position where the vertical line I is in contact with the transverse line, 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 the final direction of the internal stress 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 opposite sides of the transverse lineOf fibres
Figure BDA0002347938870000023
Two internal stresses in opposite directions exist on the cross section of the fiber, so that the fiber is twisted to form a self-twisting structure;
in addition, because the width of the vertical line I is smaller than that of the vertical line II, and the length of the vertical line I is larger than that of the vertical line II, the internal stress at the contact position of the vertical line I and the horizontal line and the internal stress at the contact position of the vertical line II and the horizontal line have certain difference, and then the vertical line I and the horizontal line are matched with each other
Figure BDA0002347938870000024
Dimensional parameters of the shape such that the twist angle per unit length of the fiber
Figure BDA0002347938870000025
Reach 111-187 degrees/10 μm, which is beneficial to the performance of all aspects of the fiber.
As a preferable scheme:
according to the preparation method of the writing brush, the mass ratio of the high-viscosity PA6 melt to the low-viscosity PA6 melt is 55: 45-65: 35.
In the preparation method of the writing brush as described above, the parameters of the FDY process are as follows: the spinning temperature is 288-292 ℃, the cooling temperature is 20-25 ℃, the speed of a first roller is 2000-2200 m/min, the temperature of a first roller is 85-95 ℃, the speed of a second roller is 3200-3400 m/min, the temperature of the second roller is 150-160 ℃, the speed of a third roller is 4100-4300 m/min, the temperature of the third roller is 160-170 ℃, and the winding speed is 4030-4220 m/min.
According to the preparation method of the writing brush, the composite spinning assembly is adopted, 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 flow channel A1 through which low-viscosity PA6 melt flows and a flow channel B1 through which high-viscosity PA6 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
Figure BDA0002347938870000031
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
Figure BDA0002347938870000032
Guide hole of spinneret orifice and
Figure BDA0002347938870000033
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the composite spinning assembly is positioned in the assembly spinning manifold.
According to the preparation method of the writing brush, the intrinsic viscosity of the high-viscosity PA6 melt is 2.50-2.60 dL/g, the temperature of the high-viscosity PA6 melt spinning manifold is 290-295 ℃, the intrinsic viscosity of the low-viscosity PA6 melt is 2.20-2.30 dL/g, the temperature of the low-viscosity PA6 melt spinning manifold is 285-290 ℃, and the temperature of the component spinning manifold is 288-292 ℃. The invention reasonably sets the temperature of the high-viscosity PA6 melt spinning manifold, the low-viscosity PA6 melt spinning manifold and the component spinning manifold, ensures that the apparent viscosity of the high-viscosity PA6 component and the apparent viscosity of the low-viscosity PA6 component extruded from the spinneret orifices are closer, and further ensures the smooth spinning.
According to the preparation method of the writing brush, the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
In the method for preparing the writing brush, the self-twisted fiber has a twisted shape and a twist angle per unit length
Figure BDA0002347938870000034
111 to 187 DEG/10 μm (
Figure BDA0002347938870000035
l is the length of the fiber section with the number of twisting turns of 1, the unit is mum), the breaking strength is more than or equal to 4.7cN/dtex, and the elongation at break is 25.0 +/-5.0%.
According to the preparation method of the writing brush, the mass ratio of the hemp fibers to the self-twisted fibers is 0-90: 10-100.
According to the preparation method of the writing brush, the water absorption rate of the writing brush is more than or equal to 260%, and the water drawing speed is more than or equal to 1.5mm/s (the test method is that a standard test solution is put into a culture dish with the diameter of 100mm, the liquid level height is 5mm, the time of the standard test solution reaching the top of a sample is calculated according to a stopwatch while the sample is vertically put into the culture dish, and the water drawing speed is obtained by dividing the time by the length of the sample).
Has the advantages that:
(1) according to the preparation method of the writing brush, the shape and the size of the spinneret orifice are reasonably designed, so that the fibers are twisted, and the water absorption rate and the water diversion speed of the writing brush are improved;
(2) according to the preparation method of the writing brush, the temperatures of the high-viscosity PA6 melt spinning manifold, the low-viscosity PA6 melt spinning manifold and the component spinning manifold are reasonably set, so that the smooth spinning of the high-viscosity PA 6/low-viscosity PA6 two-component composite fiber is guaranteed;
(3) the preparation method of the writing brush is simple in process, low in cost and extremely wide in application prospect.
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 writing brush comprises the following steps:
(1) preparing self-twisted fibers:
according to the FDY process, high-viscosity PA6 melt (the intrinsic viscosity is 2.56dL/g) and low-viscosity PA6 melt (the intrinsic viscosity is 2.26dL/g) in a mass ratio of 55:45 are distributed, and are extruded from spinneret orifices on the same spinneret plate to prepare FDY filaments, and then relaxation heat treatment is carried out to obtain the self-twisted fibers with the filament number of 5.1 dtex;
as shown in FIG. 8, the spinneret plate has orifices
Figure BDA0002347938870000041
The shape of the spinneret orifice is formed,
Figure BDA0002347938870000042
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 II to the vertical line I to the horizontal line is 1:1.8: 3.6; the width ratio of the vertical line I to the vertical line II is 1:1.9, and the widths of the vertical line I and the horizontal line are the same; 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 refers to controlling the high-viscosity PA6 melt to flow through a transverse line, and simultaneously controlling the low-viscosity PA6 melt to flow through a vertical line I and a vertical line II;
the spinning adopts a composite spinning assembly, the composite spinning assembly is positioned in an assembly spinning manifold, and as shown in figures 1-7, the composite spinning assembly 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 flow channel A1 through which low-viscosity PA6 melt flows and a flow channel B1 through which high-viscosity PA6 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
Figure BDA0002347938870000051
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
Figure BDA0002347938870000052
Guide hole of spinneret orifice and
Figure BDA0002347938870000053
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the parameters of the FDY process are as follows: the cooling temperature is 20 ℃, the speed of one roller is 2170m/min, the temperature of one roller is 90 ℃, the speed of two rollers is 3280m/min, the temperature of two rollers is 153 ℃, the speed of three rollers is 4140m/min, the temperature of three rollers is 163 ℃, and the winding speed is 4070 m/min;
the temperature of the high-viscosity PA6 melt spinning beam is 295 ℃, the temperature of the low-viscosity PA6 melt spinning beam is 289 ℃, and the temperature of the component spinning beam is 289 ℃;
the temperature of the relaxation heat treatment is 105 ℃, and the time is 21 min;
the obtained self-twisted fiber has twisted form and twist angle per unit length
Figure BDA0002347938870000054
186 °/10 μm, a breaking strength of 4.7cN/dtex, an elongation at break of 30%;
(2) preparing a writing brush:
mixing fibrilia and the prepared self-twisted fiber, softening, trimming, bundling and putting into a penholder to prepare the writing brush; wherein the mass ratio of the fibrilia to the self-twisted fiber is 30: 10;
the water absorption rate of the prepared writing brush is 286%, and the water diversion speed is 1.56 mm/s.
Example 2
A preparation method of a writing brush comprises the following steps:
(1) preparing self-twisted fibers:
according to the FDY process, high-viscosity PA6 melt (the intrinsic viscosity is 2.5dL/g) and low-viscosity PA6 melt (the intrinsic viscosity is 2.2dL/g) in a mass ratio of 55:45 are distributed, and are extruded from spinneret orifices on the same spinneret plate to prepare FDY filaments, and then relaxation heat treatment is carried out to obtain the self-twisted fibers with the filament number of 3 dtex;
the spinneret orifice is
Figure BDA0002347938870000055
The shape of the spinneret orifice is formed,
Figure BDA0002347938870000056
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 II to the vertical line I to the horizontal line is 1:1.8: 3.5; the width ratio of the vertical line I to the vertical line II is 1:1.5, and the widths of the vertical line I and the horizontal line are the same; length of transverse lineThe ratio of the degree to the width 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 refers to controlling the high-viscosity PA6 melt to flow through a transverse line, and simultaneously controlling the low-viscosity PA6 melt to flow through a vertical line I and a vertical line II;
the composite spinning assembly is used for spinning and is positioned in the assembly spinning box body, and the composite spinning assembly 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 flow channel A1 through which low-viscosity PA6 melt flows and a flow channel B1 through which high-viscosity PA6 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
Figure BDA0002347938870000061
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
Figure BDA0002347938870000062
Guide hole of spinneret orifice and
Figure BDA0002347938870000063
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the parameters of the FDY process are as follows: the cooling temperature is 20 ℃, the speed of one roller is 2000m/min, the temperature of one roller is 85 ℃, the speed of two rollers is 3200m/min, the temperature of two rollers is 150 ℃, the speed of three rollers is 4100m/min, the temperature of three rollers is 160 ℃, and the winding speed is 4030 m/min;
the temperature of the high-viscosity PA6 melt spinning manifold is 292 ℃, the temperature of the low-viscosity PA6 melt spinning manifold is 285 ℃, and the temperature of the component spinning manifold is 288 ℃;
the temperature of the relaxation heat treatment is 90 ℃ and the time is 30 min;
the obtained self-twisted fiber has twisted form and twist angle per unit length
Figure BDA0002347938870000064
111 °/10 μm, a breaking strength of 4.93cN/dtex, an elongation at break of 30%;
(2) preparing a writing brush:
mixing fibrilia and the prepared self-twisted fiber, softening, trimming, bundling and putting into a penholder to prepare the writing brush; wherein the mass ratio of the fibrilia to the self-twisted fiber is 0: 5;
the water absorption rate of the prepared writing brush is 260%, and the water drawing speed is 1.5 mm/s.
Example 3
A preparation method of a writing brush comprises the following steps:
(1) preparing self-twisted fibers:
according to the FDY process, after a high-viscosity PA6 melt (the intrinsic viscosity is 2.6dL/g) and a low-viscosity PA6 melt (the intrinsic viscosity is 2.3dL/g) in a mass ratio of 60:40 are distributed, FDY yarns are extruded from spinneret orifices on the same spinneret plate, and relaxation heat treatment is carried out to obtain the self-twisted fibers with the filament number of 5.8 dtex;
the spinneret orifice is
Figure BDA0002347938870000065
The shape of the spinneret orifice is formed,
Figure BDA0002347938870000066
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; length of vertical line II, vertical line I and horizontal lineThe ratio of the degrees is 1:2.3: 4; the width ratio of the vertical line I to the vertical line II is 1:2, and the widths of the vertical line I and the horizontal line are the same; 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 refers to controlling the high-viscosity PA6 melt to flow through a transverse line, and simultaneously controlling the low-viscosity PA6 melt to flow through a vertical line I and a vertical line II;
the composite spinning assembly is used for spinning and is positioned in the assembly spinning box body, and the composite spinning assembly 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 flow channel A1 through which low-viscosity PA6 melt flows and a flow channel B1 through which high-viscosity PA6 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
Figure BDA0002347938870000071
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
Figure BDA0002347938870000072
Guide hole of spinneret orifice and
Figure BDA0002347938870000073
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the parameters of the FDY process are as follows: the cooling temperature is 25 ℃, the one-roller speed is 2200m/min, the one-roller temperature is 95 ℃, the two-roller speed is 3400m/min, the two-roller temperature is 160 ℃, the three-roller speed is 4300m/min, the three-roller temperature is 170 ℃, and the winding speed is 4220 m/min;
the temperature of the high-viscosity PA6 melt spinning manifold is 295 ℃, the temperature of the low-viscosity PA6 melt spinning manifold is 290 ℃, and the temperature of the component spinning manifold is 292 ℃;
the temperature of the relaxation heat treatment is 120 ℃, and the time is 20 min;
the obtained self-twisted fiber has twisted form and twist angle per unit length
Figure BDA0002347938870000074
187 °/10 μm, a breaking strength of 5.04cN/dtex, an elongation at break of 29%;
(2) preparing a writing brush:
mixing fibrilia and the prepared self-twisted fiber, softening, trimming, bundling and putting into a penholder to prepare the writing brush; wherein the mass ratio of the fibrilia to the self-twisted fiber is 90: 20;
the water absorption rate of the prepared writing brush is 286%, and the water diversion speed is 1.65 mm/s.
Example 4
A preparation method of a writing brush comprises the following steps:
(1) preparing self-twisted fibers:
according to the FDY process, high-viscosity PA6 melt (the intrinsic viscosity is 2.5dL/g) and low-viscosity PA6 melt (the intrinsic viscosity is 2.24dL/g) in a mass ratio of 55:45 are distributed, and are extruded from spinneret orifices on the same spinneret plate to prepare FDY filaments, and then relaxation heat treatment is carried out to obtain the self-twisted fibers with the filament number of 4.9 dtex;
the spinneret orifice is
Figure BDA0002347938870000075
The shape of the spinneret orifice is formed,
Figure BDA0002347938870000076
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 on the transverse lineIn the position of the non-end point, 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 II to the vertical line I to the horizontal line is 1:2.1: 3.7; the width ratio of the vertical line I to the vertical line II is 1:1.9, and the widths of the vertical line I and the horizontal line are the same; 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 refers to controlling the high-viscosity PA6 melt to flow through a transverse line, and simultaneously controlling the low-viscosity PA6 melt to flow through a vertical line I and a vertical line II;
the composite spinning assembly is used for spinning and is positioned in the assembly spinning box body, and the composite spinning assembly 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 flow channel A1 through which low-viscosity PA6 melt flows and a flow channel B1 through which high-viscosity PA6 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
Figure BDA0002347938870000081
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
Figure BDA0002347938870000082
Guide hole of spinneret orifice and
Figure BDA0002347938870000083
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the parameters of the FDY process are as follows: the cooling temperature is 21 ℃, the speed of one roller is 2050m/min, the temperature of one roller is 91 ℃, the speed of two rollers is 3380m/min, the temperature of two rollers is 159 ℃, the speed of three rollers is 4160m/min, the temperature of three rollers is 161 ℃, and the winding speed is 4090 m/min;
the temperature of the high-viscosity PA6 melt spinning manifold is 290 ℃, the temperature of the low-viscosity PA6 melt spinning manifold is 287 ℃, and the temperature of the component spinning manifold is 290 ℃;
the temperature of the relaxation heat treatment is 95 ℃, and the time is 25 min;
the obtained self-twisted fiber has twisted form and twist angle per unit length
Figure BDA0002347938870000084
164 DEG/10 mu m, a breaking strength of 5.07cN/dtex, an elongation at break of 28%;
(2) preparing a writing brush:
mixing fibrilia and the prepared self-twisted fiber, softening, trimming, bundling and putting into a penholder to prepare the writing brush; wherein the mass ratio of the fibrilia to the self-twisted fiber is 20: 100;
the water absorption rate of the prepared writing brush is 275%, and the water drawing speed is 1.53 mm/s.
Example 5
A preparation method of a writing brush comprises the following steps:
(1) preparing self-twisted fibers:
according to the FDY process, high-viscosity PA6 melt (the intrinsic viscosity is 2.52dL/g) and low-viscosity PA6 melt (the intrinsic viscosity is 2.23dL/g) in a mass ratio of 65:35 are distributed, and are extruded from spinneret orifices on the same spinneret plate to prepare FDY filaments, and then relaxation heat treatment is carried out to obtain the self-twisted fibers with the filament number of 4 dtex;
the spinneret orifice is
Figure BDA0002347938870000091
The shape of the spinneret orifice is formed,
Figure BDA0002347938870000092
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 II to the vertical line I to the horizontal line is 1:2.3: 3.6; the width ratio of the vertical line I to the vertical line II is 1:1.6, and the widths of the vertical line I and the horizontal line are the same; the ratio of the length to the width of the transverse lines is 12: 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 PA6 melt to flow through a transverse line, and simultaneously controlling the low-viscosity PA6 melt to flow through a vertical line I and a vertical line II;
the composite spinning assembly is used for spinning and is positioned in the assembly spinning box body, and the composite spinning assembly 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 flow channel A1 through which low-viscosity PA6 melt flows and a flow channel B1 through which high-viscosity PA6 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
Figure BDA0002347938870000093
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
Figure BDA0002347938870000094
Shaped spinneret orificeGuide hole and
Figure BDA0002347938870000095
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the parameters of the FDY process are as follows: the cooling temperature is 22 ℃, the speed of one roller is 2070m/min, the temperature of one roller is 90 ℃, the speed of two rollers is 3320m/min, the temperature of two rollers is 160 ℃, the speed of three rollers is 4240m/min, the temperature of three rollers is 162 ℃, and the winding speed is 4170 m/min;
the temperature of the high-viscosity PA6 melt spinning manifold is 293 ℃, the temperature of the low-viscosity PA6 melt spinning manifold is 286 ℃, and the temperature of the component spinning manifold is 290 ℃;
the temperature of the relaxation heat treatment is 112 ℃, and the time is 21 min;
the obtained self-twisted fiber has twisted form and twist angle per unit length
Figure BDA0002347938870000096
130 DEG/10 mu m, a breaking strength of 5.1cN/dtex, an elongation at break of 25%;
(2) preparing a writing brush:
mixing fibrilia and the prepared self-twisted fiber, softening, trimming, bundling and putting into a penholder to prepare the writing brush; wherein the mass ratio of the fibrilia to the self-twisted fiber is 70: 80;
the water absorption rate of the prepared writing brush is 265%, and the water drawing speed is 1.51 mm/s.
Example 6
A preparation method of a writing brush comprises the following steps:
(1) preparing self-twisted fibers:
according to the FDY process, high-viscosity PA6 melt (the intrinsic viscosity is 2.54dL/g) and low-viscosity PA6 melt (the intrinsic viscosity is 2.25dL/g) in a mass ratio of 65:35 are distributed, and are extruded from spinneret orifices on the same spinneret plate to prepare FDY filaments, and then relaxation heat treatment is carried out to obtain the self-twisted fibers with the filament number of 3.5 dtex;
the spinneret orifice is
Figure BDA0002347938870000101
Shaped spinneretThe holes are arranged in the upper part of the shell,
Figure BDA0002347938870000102
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 II to the vertical line I to the horizontal line is 1:1.8: 4; the width ratio of the vertical line I to the vertical line II is 1:1.7, and the widths of the vertical line I and the horizontal line are the same; the ratio of the length to the width of the transverse lines is 12: 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 PA6 melt to flow through a transverse line, and simultaneously controlling the low-viscosity PA6 melt to flow through a vertical line I and a vertical line II;
the composite spinning assembly is used for spinning and is positioned in the assembly spinning box body, and the composite spinning assembly 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 flow channel A1 through which low-viscosity PA6 melt flows and a flow channel B1 through which high-viscosity PA6 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
Figure BDA0002347938870000103
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
Figure BDA0002347938870000104
Guide hole of spinneret orifice and
Figure BDA0002347938870000105
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the parameters of the FDY process are as follows: the cooling temperature is 21 ℃, the speed of one roller is 2020m/min, the temperature of one roller is 87 ℃, the speed of two rollers is 3220m/min, the temperature of two rollers is 154 ℃, the speed of three rollers is 4200m/min, the temperature of three rollers is 163 ℃, and the winding speed is 4130 m/min;
the temperature of the high-viscosity PA6 melt spinning manifold is 294 ℃, the temperature of the low-viscosity PA6 melt spinning manifold is 288 ℃, and the temperature of the component spinning manifold is 288 ℃;
the temperature of the relaxation heat treatment is 95 ℃, and the time is 22 min;
the obtained self-twisted fiber has twisted form and twist angle per unit length
Figure BDA0002347938870000106
121 DEG/10 mu m, a breaking strength of 5.13cN/dtex, an elongation at break of 21%;
(2) preparing a writing brush:
mixing fibrilia and the prepared self-twisted fiber, softening, trimming, bundling and putting into a penholder to prepare the writing brush; wherein the mass ratio of the fibrilia to the self-twisted fiber is 40: 20;
the water absorption rate of the prepared writing brush is 283%, and the water drawing speed is 1.58 mm/s.
Example 7
A preparation method of a writing brush comprises the following steps:
(1) preparing self-twisted fibers:
according to the FDY process, after a high-viscosity PA6 melt (the intrinsic viscosity is 2.55dL/g) and a low-viscosity PA6 melt (the intrinsic viscosity is 2.29dL/g) in a mass ratio of 60:40 are distributed, FDY yarns are extruded from spinneret orifices on the same spinneret plate, and relaxation heat treatment is carried out to obtain self-twisted fibers with the filament number of 4 dtex;
the spinneret orifice is
Figure BDA0002347938870000111
The shape of the spinneret orifice is formed,
Figure BDA0002347938870000112
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 II to the vertical line I to the horizontal line is 1:1.8: 3.8; the width ratio of the vertical line I to the vertical line II is 1:1.7, and the widths of the vertical line I and the horizontal line are the same; 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 refers to controlling the high-viscosity PA6 melt to flow through a transverse line, and simultaneously controlling the low-viscosity PA6 melt to flow through a vertical line I and a vertical line II;
the composite spinning assembly is used for spinning and is positioned in the assembly spinning box body, and the composite spinning assembly 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 flow channel A1 through which low-viscosity PA6 melt flows and a flow channel B1 through which high-viscosity PA6 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
Figure BDA0002347938870000113
The through holes on the shape groove, E corresponds to the horizontal line, F corresponds to the vertical line I, G corresponds to the vertical line II, M3 are positioned at the two ends of E,the through hole on O3 is positioned at one end of F far away from E, and the through hole on I3 is positioned at one end of G far away from E; on the spinneret plate
Figure BDA0002347938870000114
Guide hole of spinneret orifice and
Figure BDA0002347938870000115
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the parameters of the FDY process are as follows: the cooling temperature is 22 ℃, the speed of one roller is 2030m/min, the temperature of one roller is 90 ℃, the speed of two rollers is 3340m/min, the temperature of two rollers is 158 ℃, the speed of three rollers is 4280m/min, the temperature of three rollers is 170 ℃, and the winding speed is 4210 m/min;
the temperature of the high-viscosity PA6 melt spinning beam is 294 ℃, the temperature of the low-viscosity PA6 melt spinning beam is 289 ℃, and the temperature of the component spinning beam is 290 ℃;
the temperature of the relaxation heat treatment is 94 ℃ and the time is 25 min;
the obtained self-twisted fiber has twisted form and twist angle per unit length
Figure BDA0002347938870000116
162 DEG/10 mu m, a breaking strength of 5.17cN/dtex, an elongation at break of 20%;
(2) preparing a writing brush:
mixing fibrilia and the prepared self-twisted fiber, softening, trimming, bundling and putting into a penholder to prepare the writing brush; wherein the mass ratio of the fibrilia to the self-twisted fiber is 70: 50;
the water absorption rate of the prepared writing brush is 271%, and the water drawing speed is 1.55 mm/s.
Example 8
A preparation method of a writing brush comprises the following steps:
(1) preparing self-twisted fibers:
according to the FDY process, high-viscosity PA6 melt (the intrinsic viscosity is 2.53dL/g) and low-viscosity PA6 melt (the intrinsic viscosity is 2.29dL/g) in a mass ratio of 55:45 are distributed, and are extruded from spinneret orifices on the same spinneret plate to prepare FDY filaments, and then relaxation heat treatment is carried out to obtain the self-twisted fibers with the filament number of 5.7 dtex;
the spinneret orifice is
Figure BDA0002347938870000121
The shape of the spinneret orifice is formed,
Figure BDA0002347938870000122
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 II to the vertical line I to the horizontal line is 1:2.1: 3.7; the width ratio of the vertical line I to the vertical line II is 1:1.8, and the widths of the vertical line I and the horizontal line are the same; 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 refers to controlling the high-viscosity PA6 melt to flow through a transverse line, and simultaneously controlling the low-viscosity PA6 melt to flow through a vertical line I and a vertical line II;
the composite spinning assembly is used for spinning and is positioned in the assembly spinning box body, and the composite spinning assembly 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 flow channel A1 through which low-viscosity PA6 melt flows and a flow channel B1 through which high-viscosity PA6 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
Figure BDA0002347938870000123
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
Figure BDA0002347938870000124
Guide hole of spinneret orifice and
Figure BDA0002347938870000125
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the parameters of the FDY process are as follows: the cooling temperature is 25 ℃, the speed of one roller is 2030m/min, the temperature of one roller is 85 ℃, the speed of two rollers is 3370m/min, the temperature of two rollers is 159 ℃, the speed of three rollers is 4300m/min, the temperature of three rollers is 169 ℃, and the winding speed is 4230 m/min;
the temperature of the high-viscosity PA6 melt spinning manifold is 293 ℃, the temperature of the low-viscosity PA6 melt spinning manifold is 289 ℃, and the temperature of the component spinning manifold is 292 ℃;
the temperature of the relaxation heat treatment is 93 ℃, and the time is 28 min;
the obtained self-twisted fiber has twisted form and twist angle per unit length
Figure BDA0002347938870000131
111 °/10 μm, break strength of 5.17cN/dtex, elongation at break of 20%;
(2) preparing a writing brush:
mixing fibrilia and the prepared self-twisted fiber, softening, trimming, bundling and putting into a penholder to prepare the writing brush; wherein the mass ratio of the fibrilia to the self-twisted fiber is 10: 50;
the water absorption rate of the prepared writing brush is 262%, and the water diversion speed is 1.57 mm/s.

Claims (9)

1. A preparation method of a writing brush is characterized by comprising the following steps: mixing the fibrilia and the self-twisted fiber, softening, trimming, bundling and then putting into a penholder to prepare the writing brush;
the filament number of the self-twisted fiber is 3.0-5.8 dtex, and the preparation process is as follows:
according to the FDY process, after a high-viscosity PA6 melt and a low-viscosity PA6 melt are distributed, FDY filaments are extruded from spinneret orifices on the same spinneret plate, and relaxation heat treatment is carried out to obtain self-twisted fibers;
the spinneret orifice is
Figure FDA0002347938860000011
The shape of the spinneret orifice is formed,
Figure FDA0002347938860000012
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 II to the vertical line I to the horizontal line is 1: 1.8-2.3: 3.5-4.0; the width ratio of the vertical line I to the vertical line II is 1: 1.5-2.0, and the widths of the vertical line I and the horizontal line are the same; 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 is such that the flow of high viscosity PA6 melt is controlled through the transverse line while the flow of low viscosity PA6 melt is controlled through the vertical lines I and II.
2. The method for preparing the writing brush according to claim 1, wherein the mass ratio of the high-viscosity PA6 melt to the low-viscosity PA6 melt is 55: 45-65: 35.
3. The method for preparing a writing brush according to claim 2, wherein the parameters of the FDY process are as follows: the cooling temperature is 22-25 ℃, the speed of one roller is 2222-2222 m/min, the temperature of one roller is 85-85 ℃, the speed of two rollers is 3222-3422 m/min, the temperature of two rollers is 152-162 ℃, the speed of three rollers is 4122-4322 m/min, the temperature of three rollers is 162-112 ℃, and the winding speed is 4232-4222 m/min.
4. The method for preparing the writing brush according to claim 3, wherein a composite spinning assembly is adopted, and the composite spinning assembly comprises a first distribution plate, a second distribution plate, a third distribution plate and a spinneret plate which are closely attached from top to bottom;
the first distribution plate is provided with a flow channel A1 through which low-viscosity PA6 melt flows and a flow channel B1 through which high-viscosity PA6 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
Figure FDA0002347938860000021
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
Figure FDA0002347938860000022
Guide hole of spinneret orifice and
Figure FDA0002347938860000023
the shape grooves are communicated, and the orthographic projections are completely overlapped;
the composite spinning assembly is positioned in the assembly spinning manifold.
5. The method for preparing the writing brush according to claim 4, wherein the intrinsic viscosity of the high-viscosity PA6 melt is 2.52-2.62 dL/g, the temperature of the high-viscosity PA6 melt spinning manifold is 282-285 ℃, the intrinsic viscosity of the low-viscosity PA6 melt is 2.22-2.32 dL/g, the temperature of the low-viscosity PA6 melt spinning manifold is 285-282 ℃, and the temperature of the component spinning manifold is 288-282 ℃.
6. The method for preparing a writing brush according to claim 5, wherein the temperature of the relaxation heat treatment is 82-122 ℃ for 22-32 min.
7. The method for preparing a writing brush according to claim 6, wherein the self-twisted fiber has a twisted form, a twist angle phi per unit length is 111-181 °/12 μm, a breaking strength is not less than 4.1cN/dtex, and an elongation at break is 25.2 ± 5.2%.
8. The method for preparing the writing brush according to claim 1, wherein the mass ratio of the hemp fiber to the self-twisted fiber is 2-82: 12-122.
9. The method for preparing the writing brush according to claim 8, wherein the water absorption rate of the writing brush is not less than 262%, and the water drawing speed is not less than 1.5 mm/s.
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