High-light-sensation special-shaped polyester filament and preparation method thereof

Abstract

The invention belongs to the technical field of differential polyester filaments, and relates to a high-light-sensation special-shaped polyester filament and a preparation method thereof, and the preparation method comprises the following steps: extruding a super bright polyester melt through a spinneret plate, cooling, oiling and winding to obtain the high-light-sensation special-shaped polyester filament, the spinneret plate is provided with a plurality of rows of Y-shaped spinneret orifices which are arranged in a rhombus shape, and any two adjacent rows of Y-shaped spinneret orifices are arranged in a staggered manner; the spinneret plate is divided into an area A and an area B by taking a diagonal line of the rhombus as a boundary line; the Y-shaped spinneret orifice comprises a guide hole and a micro hole, the guide hole is located above the micro hole, the micro hole comprises three blades with the same size, and the difference between the Y-shaped spinneret orifice without the convex points and the Y-shaped spinneret orifice with the convex points is that the three blades of the Y-shaped spinneret orifice with the convex points are all provided with a plurality of convex points. The polyester filament provided by the invention has luster of different angles, the highly saturated cross section endows the fiber with good elasticity, and the fabric prepared from the polyester filament has softer and more comfortable hand feeling.

Description

Technical Field

[0001] The invention belongs to the technical field of differentiated polyester filaments, and relates to a high-light-sensitivity special-shaped polyester filament and a preparation method thereof. Background Art

[0002] With the rapid development of my country's economy, the textile industry has also entered a period of rapid development. With the improvement of people's quality of food, clothing, housing and transportation, the development of the textile industry has also been driven. For example, the visual effect, moisture absorption and breathability of fabrics, and more comfortable and soft feel have become a common pursuit. Due to the longitudinal unevenness of the surface, the special-shaped cross-section fiber also shows excellent performance in visual effects and moisture absorption. In order to further meet the needs, it is also necessary to improve the gloss, moisture absorption and perspiration properties and feel of the fabric.

[0003] For example, patent CN107904682A discloses elastic cotton-like polyester fiber and its preparation method, which is provided with two special shapes of spinnerets, that is, a bundle of fibers extruded from the same spinneret contains both cross-shaped monofilaments and round monofilaments, so that the fiber has certain moisture absorption and perspiration-wicking properties and a cotton-like feel. However, the circular cross-section and the cross-shaped cross-section have different cooling requirements for the fiber, and it is very easy for the circular fiber to be cooled evenly while the irregular cross-section is overcooled, which affects its irregularity and further affects the feel of the fiber.

[0004] For example, patent CN107938000A discloses a porous super-bright polyester fiber and its preparation method, which has triangular spinneret holes and straight spinneret holes on the composite spinneret plate, so that the fiber has the properties of good fluffiness, good air permeability and super-bright flash effect. However, the triangular cross-section and the straight cross-section have different requirements for fiber cooling, which easily leads to problems such as swaying of the tow when the triangular cross-section is cooled evenly and excessive cooling of the straight cross-section, thereby affecting the uniformity of the fiber physical indicators and the brightness of the fiber.

[0005] Therefore, it is of great significance to study a high-gloss-sensitive special-shaped polyester filament and a preparation method thereof to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the problems existing in the prior art and provide a high-light-sensitivity special-shaped polyester filament and a preparation method thereof.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A method for preparing high-gloss special-shaped polyester filaments, wherein a high-gloss polyester melt is extruded through a spinneret, and then cooled, oiled and wound to obtain high-gloss special-shaped polyester filaments;

[0009] Since the polymer melt spinneret works at 290-298°C for a long time and is subjected to a certain pressure, the spinneret body needs to be made of corrosion-resistant and heat-resistant alloy materials. The material of the spinneret body can be SUS304, SUS316 and other materials. The spinneret is provided with Y-shaped spinnerets arranged in multiple rows of rhombuses, and any two adjacent rows of Y-shaped spinnerets are arranged in a staggered manner; the spinneret is divided into two areas, A and B, with the diagonal line of the rhombus as the dividing line, and the spinnerets in area A are Y-shaped spinnerets with convex points, and the spinnerets in area B are Y-shaped spinnerets without convex points; the spinneret is designed with two types of Y-shaped spinnerets without convex points and Y-shaped spinnerets with convex points, and the Y-shaped spinnerets make the fiber have the characteristics of super bright flash, and after the subsequent elasticization hot box, the bundles of fibers with different cross sections are bundled together, so that the finished product has a gloss of different angles, and the highly saturated cross section gives the fiber good elasticity. At the same time, due to the irregular special-shaped cross section, there are gaps between the fibers when they are arranged, so that the fabric in the subsequent process feels softer and more comfortable; in addition, the use of high-gloss polyester melt without adding matting agent TiO2 improves its brightness;

[0010] The Y-type spinneret includes a guide hole and a micro hole, the guide hole is located above the micro hole, the micro hole includes three blades of the same size, and the difference between the Y-type spinneret without convex points and the Y-type spinneret with convex points is that the three blades of the Y-type spinneret with convex points are all provided with a plurality of convex points;

[0011] The height of the windless zone corresponding to area A on the spinneret is 35~45mm, and the cooling air pressure is 34~36Pa; the height of the windless zone corresponding to area B on the spinneret is 45~55mm, and the cooling air pressure is 29~31Pa.

[0012] Because the temperature of the polyester melt is very high within a certain distance after it is melted and extruded from the spinneret, and it is in a state of relatively good fluidity, it is necessary to set a certain distance without cooling wind speed (windless zone), the main purpose of which is to prevent the melt stream from being broken after being disturbed by the cooling wind speed. The conventional ring-blowing cooling method is to use a ring-blowing blower device for cooling. The blower is installed in the static pressure bin. The wind pressure of the static pressure bin is adjusted by adjusting the air intake of the static pressure bin, so as to achieve the effect of adjusting the air volume of the blower. This cooling method has a uniform cooling effect. However, the setting of the conventional windless zone and the ring-blowing cooling method are not applicable to the fiber developed this time, because the same spinneret of the fiber has two different shapes of spinnerets. In order to ensure the irregularity and cooling uniformity of the two shapes of the filament bundles, two different cooling effects are required, that is, the air volume on both sides of a circular blower is inconsistent, and the windless zones corresponding to the two bundles are inconsistent. The height of the windless zone is adjusted by adjusting the height of the two silicone sealing rings on the upper end of the blower (embedded between the blower fairing shell and the inner liner, which is the existing technology). Specifically, the Y-shaped spinneret with convex points has a larger specific surface area, so the heat dissipation performance of the high-temperature polyester melt extruded from the spinneret is better, the cooling speed is faster, and the solidification point of the filament bundle is at a higher position, so the corresponding windless zone is smaller; at the same time, in order to reduce the collapse caused by the puffing effect of the convex points, the cooling air pressure corresponding to the Y-shaped spinneret with convex points is relatively large, which is beneficial to improve the degree of special shape.

[0013] As the preferred technical solution:

[0014] As described above, in a method for preparing a high-gloss profiled polyester filament, 10 convex points of the same size are evenly distributed on each blade of a Y-shaped spinneret with convex points (the 10 convex points are divided into two symmetrical groups along the central axis of the blade, and the 5 convex points in each group are arranged at equal distances), the height of the convex points is 0.02~0.05mm, and the cone angle α of the convex points is 100°~110°. The increase in the cone angle α prevents the melt from being retained and clogging the spinneret when passing through the gap between the convex points, thereby improving the flowability of the melt; however, after the polyester melt is melted and extruded from the spinneret, due to the elastic memory effect of the polymer, a swelling phenomenon occurs. If the cone angle α exceeds 110°, the swelling effect of the convex points will cause collapse, and the different effects of the two profiled cross-sections cannot be achieved.

[0015] A method for preparing high-gloss profiled polyester filaments as described above, wherein one spinning position has 8 to 16 spinnerets, and the positions of the A area and the B area of ​​the spinneret plates on two adjacent spinnerets are opposite, that is, the overall arrangement is A, B, B, A, A, B...;

[0016] There is a wind tube corresponding to each spinneret assembly below, and the interior of the wind box where the wind tube is located is divided into multiple chambers, and each chamber is separated by a semi-circumferential surface of the wind tube and two vertical plates connected to two straight sides of the semi-circumferential surface, and the orthographic projections of the two vertical plates on the spinneret above them are collinear with the boundary line between the two areas A and B on the spinneret;

[0017] The chamber corresponding to the A area of ​​the spinneret is recorded as chamber A, and the chamber corresponding to the B area of ​​the spinneret is recorded as chamber B. Chamber A is connected to the first air inlet duct, and chamber B is connected to the second air inlet duct. The first air inlet duct and the second air inlet duct are connected to the main air duct. Air inlet valves are respectively installed on the first air inlet duct and the second air inlet duct, which can adjust the air intake volume of chamber A and chamber B separately to achieve different wind pressure conditions of the same air duct.

[0018] In the method for preparing high-gloss profiled polyester filaments as described above, the number of holes in the spinneret is 192-288.

[0019] As described above, in a method for preparing high-gloss shaped polyester filaments, a cylindrical base is arranged at the bottom of the air duct, and an inverted rounded cone cylinder with a honeycomb hole structure is nested in the lower part of the cylindrical base, and the large end of the inverted rounded cone cylinder is fixedly connected to the cylindrical base, for example, by welding or clamping.

[0020] The bottom of the prior art wind tube is a cylindrical base without wind speed. Due to the cooling wind speed in the wind tube and the downward movement of the filament bundle, there will be a certain pressure in the wind tube, which causes the filament bundle to shake when it goes directly from the wind tube with a certain cooling wind speed to the cylindrical base and the outside of the wind tube. In particular, in order to improve the degree of irregularity, the shaking of the filament bundle is aggravated when the wind pressure increases, affecting the cooling effect of the multi-F fiber, and even causing adhesion between the filament bundles due to the shaking. The present invention, by adding a frustum cylinder with a honeycomb hole structure to the lower part of the cylindrical base at the bottom of the wind tube, when the wind blown out of the wind tube passes through this area, a part of the wind will be discharged through this area, reducing the blocking pressure of the filament bundle when passing through this part, thereby solving the problem of shaking of the multi-F fiber bundle and improving the cooling effect of the fiber.

[0021] The method for preparing a high-gloss profiled polyester filament as described above, wherein the height of the cylindrical base is 8 to 12 cm and the wall thickness is 0.5 to 1 cm;

[0022] The height of the inverted cone cylinder of the honeycomb hole structure is 5~8cm, the cone angle of the inverted cone is 5°~15°, and the aperture of the honeycomb hole is 1~3mm.

[0023] In the method for preparing the highly glossy special-shaped polyester filaments as described above, the characteristic viscosity of the highly glossy polyester melt is 0.61-0.63 dL / g.

[0024] The present invention also provides a high-gloss profiled polyester filament prepared by the preparation method as described in any one of the above items, wherein the high-gloss profiled polyester filament has a relative radial profile of ≥50%, a breaking strength of ≥1.80 cN / dtex, a breaking strength variation coefficient of ≤4.00%, a breaking elongation of 118-122%, a breaking elongation variation coefficient of ≤4.00%, and a yarn unevenness CV value of ≤1.8%;

[0025] The chromaticity of the high-gloss profiled polyester filaments was tested, with the L value ≥ 90% and the b value being 1~2.

[0026] Beneficial effects:

[0027] (1) The present invention provides a Y-shaped spinneret without convex points and a Y-shaped spinneret with convex points on the spinneret plate, so that the produced yarn has two different cross-sections. When the two types of yarn are bundled together, the finished product can have luster at different angles. The highly saturated cross-section gives the fiber good elasticity. In addition, due to the irregular cross-section, the subsequent fabric will feel softer and more comfortable.

[0028] (2) The present invention divides a plurality of chambers on a vertical plate in the wind box to correspond to the fibers ejected from different areas of the spinneret, and adjusts the air intake of chamber A and chamber B respectively through two air inlet valves, so that fibers with different cross-sections can achieve the cooling effects they need.

[0029] (3) The present invention adds an inverted truncated cone cylinder with a honeycomb hole structure to the lower inner part of the cylindrical base at the bottom of the wind tube. When the wind blown out of the wind tube passes through this area, a part of the wind will be discharged through this area, reducing the blocking pressure of the tow when it passes through this part, thereby solving the problem of shaking of the multi-F fiber tow and improving the cooling effect of the fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of a Y-shaped spinneret hole with convex points on a spinneret of the present invention;

[0031] Figure 2 It is a schematic diagram of the leaf length of the Y-band convex point spinneret hole of the present invention;

[0032] Figure 3 Schematic diagram of the distribution of spinneret holes on the spinneret of the present invention (the number of spinneret holes in the figure is for illustration only);

[0033] Figure 4 Schematic diagram of the cooling device of the present invention; in the figure, the black arrow indicates the flow direction of the wind in the wind duct;

[0034] Figure 5 It is a schematic diagram of the air duct base of the present invention;

[0035] Figure 6It is a schematic diagram of the distribution of the air cylinder and the chamber in the air box of the present invention;

[0036] Among them, 3-air cylinder, 4-bellows box, 5-first air inlet duct, 6-second air inlet duct, 7-main air duct, 8-air inlet valve A, 9-air inlet valve B, 10-vertical plate. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0038] The testing methods of the relevant performance indicators in the following embodiments and comparative examples are as follows:

[0039] Relative radial profile: The diameter of the high-gloss profiled polyester filament prepared in each embodiment was measured with reference to the standard FZ / T 50002-2013 "Test Method for Profile of Chemical Fibers", and then the relative radial profile was calculated according to the formula.

[0040] Breaking strength, breaking strength variation coefficient, breaking elongation, breaking elongation variation coefficient: Referring to GB / T14344-2022 "Test method for tensile properties of chemical fiber filaments", a fully automatic single yarn strength machine (model YG023B-Ⅱ) was used to measure the high-gloss-sensitive special-shaped polyester filaments prepared in each embodiment. The specific process is: first, the high-gloss-sensitive special-shaped polyester filaments are placed in an environment with a temperature of 20°C and a humidity of 65% for 4 hours, and then clamped by upper and lower clamps (clamping length of 500mm), and a pre-tension of 0.05cN / dtex is applied by the manipulator to stabilize the high-gloss-sensitive special-shaped polyester filaments. At the beginning of the test, the lower clamp uniformly stretches the filament bundle at a speed of 500mm / min until the filament bundle breaks. At the same time, the real-time data of the force sensor during the stretching process is recorded, and the relationship curve between strength and elongation is drawn through the data collection system. Finally, the breaking strength, breaking strength variation coefficient, breaking elongation, and breaking elongation variation coefficient of the filament bundle are obtained through data processing and analysis.

[0041] CV value of yarn unevenness: with reference to GB / T 14346-2015 "Test method for yarn unevenness of chemical fiber filaments - capacitance method" standard, the high-gloss-sensitive profiled polyester filaments prepared in each embodiment were measured using USTER5 yarn unevenness meter. The specific process is as follows: first, the high-gloss-sensitive profiled polyester filaments were placed in an environment with a temperature of 20°C and a humidity of 65% for 2 hours, and then the high-gloss-sensitive profiled polyester filaments were passed through the two electrodes of the capacitor at a uniform speed, and the mass in each equal interval was converted into an electrical signal, and the percentage of the standard deviation of all test electrical signals to the average value was the yarn unevenness; wherein, the test speed was 200 m / min, and the yarn bundle test time was 2.5 min.

[0042] L value, b value: refer to method B (drying method) in GB / T 14190-2017 "Fiber-grade polyester (PET) chip sample method" and use a colorimeter to measure the high-gloss profiled polyester filaments prepared in each embodiment. The specific process is: take 50g of oil-free filaments (filaments that have not been oiled after cooling) of high-gloss profiled polyester filaments and place them in a colorimetric cup, and the value is displayed digitally on the colorimeter.

[0043] Example 1

[0044] A method for preparing high-gloss-sensitive special-shaped polyester filaments, the specific process is as follows:

[0045] A high-gloss polyester melt with an intrinsic viscosity of 0.61 dL / g (PTA (purified terephthalic acid) and EG (ethylene glycol) with a mass ratio of 70.5:29.5 as raw materials, produced by esterification and polycondensation reaction in sequence) was extruded through a spinneret at 290°C, and then cooled, oiled and wound to obtain high-gloss profiled polyester filaments; wherein the cooling air temperature was 21°C and the cooling air humidity was 75%;

[0046] In the above process of preparing high-gloss profiled polyester filaments, a spinning position has a total of 8 spinnerets; the spinneret of each spinneret assembly is provided with 22 rows of Y-shaped spinneret holes arranged in a diamond shape, and any two adjacent rows of Y-shaped spinneret holes are staggered, and the number of holes in the spinneret is 192;

[0047] like Figure 1 As shown, the Y-shaped spinneret includes a guide hole and a micro hole, the guide hole is located above the micro hole, and the micro hole includes three blades of the same size;

[0048] like Figure 3 As shown, the spinneret is divided into two areas, A and B, with the diagonal line of the diamond as the dividing line. The positions of the A area and the B area of ​​the spinneret on two adjacent spinneret assemblies are opposite;

[0049] like Figure 1 , Figure 2As shown, the spinneret in area A is a Y-shaped spinneret with convex points, and 10 convex points of the same size are evenly distributed on each blade of the microhole, the height of the convex point is 0.02 mm, and the cone angle α of the convex point is 110°; the spinneret in area B is a Y-shaped spinneret without convex points;

[0050] like Figure 4 , Figure 6 As shown, there is a wind tube 3 corresponding to the bottom of each spinning assembly, and the interior of the wind box 4 where the wind tube 3 is located is divided into 9 chambers, and each chamber is separated by a semi-circumferential surface of the wind tube 3 and two vertical plates 10 connected to two straight sides of the semi-circumferential surface. The edges of the two vertical plates 10 that are in contact with the inner walls of the wind tube 3 and the wind box 4 are respectively covered with sealing rubber sleeves, so that the chambers are not interfered by the wind pressure difference.

[0051] The orthographic projections of the two vertical plates 10 on the spinneret above them are collinear with the boundary line between the two areas A and B on the spinneret;

[0052] The chamber corresponding to the A region of the spinneret is recorded as chamber A, and the chamber corresponding to the B region of the spinneret is recorded as chamber B. Chamber A is connected to the first air inlet duct 5, and chamber B is connected to the second air inlet duct 6. The first air inlet duct 5 and the second air inlet duct 6 are both connected to the main air duct 7. The first air inlet duct 5 and the second air inlet duct 6 are respectively installed with an air inlet valve A 8 and an air inlet valve B 9;

[0053] The height of the windless zone corresponding to area A on the spinneret is 35 mm, and the cooling air pressure is 34 Pa;

[0054] The height of the windless zone corresponding to area B on the spinneret is 45 mm, and the cooling air pressure is 29 Pa;

[0055] like Figure 4 , Figure 5 As shown, a cylindrical base is provided at the bottom of the air cylinder 3, and an inverted round cone cylinder with a honeycomb hole structure is nested in the lower part of the cylindrical base, and the large end of the inverted round cone cylinder is fixedly connected to the cylindrical base;

[0056] The height of the cylindrical base is 8 cm and the wall thickness is 0.5 cm;

[0057] The height of the inverted truncated cone cylinder of the honeycomb hole structure is 5 cm, the cone angle of the inverted truncated cone is 5°, and the aperture of the honeycomb hole is 3 mm.

[0058] The final high-gloss shaped polyester filament had a relative radial profile of 51.2%, a breaking strength of 2.25 cN / dtex, a breaking strength variation coefficient of 2.13%, a breaking elongation of 120.1%, a breaking elongation variation coefficient of 2.34%, and a yarn unevenness CV value of 1.4%; the high-gloss shaped polyester filament was subjected to colorimetric testing, with the L value being 91.68 and the b value being 1.34.

[0059] Comparative Example 1

[0060] A method for preparing high-gloss profiled polyester filaments, the specific process is the same as that of Example 1, the only difference is that the heights of the windless zones corresponding to area A and area B on the spinneret are both 35 mm, and the cooling wind pressure is both 34 Pa.

[0061] The final high-gloss shaped polyester filaments had a relative radial profile of 53.5%, a breaking strength of 2.24 cN / dtex, a breaking strength variation coefficient of 3.39%, a breaking elongation of 120.4%, a breaking elongation variation coefficient of 4.09%, and a yarn unevenness CV value of 1.87%; the high-gloss shaped polyester filaments were subjected to colorimetric testing, with the L value being 90.81 and the b value being 1.51.

[0062] By comparing Comparative Example 1 with Example 1, it can be found that the coefficient of variation of breaking strength, coefficient of variation of breaking elongation and strip unevenness of Comparative Example 1 are increased. This is because the spinnerets corresponding to area A and area B are inconsistent, but the cooling requirements are consistent, resulting in the spinneret holes in area B being Y-shaped spinnerets without convex points, which are cooled quickly and form a skin-core structure, thereby deteriorating the uniformity of physical indicators.

[0063] Comparative Example 2

[0064] A method for preparing high-gloss profiled polyester filaments, the specific process is the same as that of Example 1, the only difference is that: the heights of the windless zones corresponding to areas A and B on the spinneret are both 45 mm, and the cooling wind pressure is 29 Pa.

[0065] The final high-gloss shaped polyester filament had a relative radial profile of 46.1%, a breaking strength of 2.11 cN / dtex, a breaking strength variation coefficient of 3.14%, a breaking elongation of 119.2%, a breaking elongation variation coefficient of 4.37%, and a yarn unevenness CV value of 1.94%; the high-gloss shaped polyester filament was subjected to colorimetric testing, with the L value being 91.02 and the b value being 1.45.

[0066] By comparing Comparative Example 2 with Example 1, it can be found that the relative radial profile of Comparative Example 2 is greatly reduced, and the coefficient of variation of breaking strength, the coefficient of variation of breaking elongation and the unevenness of the strip are increased. This is because the spinnerets corresponding to area A and area B are inconsistent, but the cooling requirements are consistent, resulting in the spinnerets in area A being Y-shaped with convex points. The spinnerets are cooled later, which delays their cooling time, thereby reducing the relative radial profile. In addition, the cooling air pressure is too small, resulting in insufficient cooling, and then the uniformity of physical indicators deteriorates.

[0067] Comparative Example 3

[0068] A method for preparing high-gloss profiled polyester filaments, the specific process is the same as that of Example 1, the only difference is that: the lower part of the cylindrical base at the bottom of the cooling air duct, which is embedded with a honeycomb hole structure, is omitted.

[0069] The final high-gloss shaped polyester filament had a relative radial profile of 50.8%, a breaking strength of 2.18 cN / dtex, a breaking strength variation coefficient of 3.48%, a breaking elongation of 119.7%, a breaking elongation variation coefficient of 4.06%, and a yarn unevenness CV value of 1.88%; the high-gloss shaped polyester filament was subjected to colorimetric testing, with the L value being 91.13 and the b value being 1.39.

[0070] By comparing Comparative Example 3 with Example 1, it can be found that the coefficient of variation of the breaking strength, the coefficient of variation of the breaking elongation and the unevenness of the yarns of Comparative Example 3 increased. This is because the lower part of the cylindrical base at the bottom of the cooling duct is not nested with the inverted rounded cone cylinder with a honeycomb hole structure, resulting in the shaking of 192 filament bundles when the filament bundles go directly from the duct with a higher cooling wind speed to the cylindrical base and the outside of the duct, affecting the cooling effect of the multi-F fiber, and thus the uniformity of the physical indicators deteriorates.

[0071] Example 2

[0072] A method for preparing high-gloss-sensitive special-shaped polyester filaments, the specific process is as follows:

[0073] A high-gloss polyester melt with an intrinsic viscosity of 0.616 dL / g (PTA and EG with a mass ratio of 71:29 as raw materials, produced by esterification and polycondensation reaction in sequence) was extruded through a spinneret at 298°C, and then cooled, oiled and wound to obtain high-gloss profiled polyester filaments; wherein the cooling air temperature was 21.5°C and the cooling air humidity was 78%;

[0074] In the above process of preparing high-gloss profiled polyester filaments, a spinning position has 16 spinnerets in total; the spinneret of each spinneret assembly is provided with 24 rows of Y-shaped spinneret holes arranged in a diamond shape, and any two adjacent rows of Y-shaped spinneret holes are staggered, and the number of holes in the spinneret is 216;

[0075] The Y-shaped spinneret includes a guide hole and a micro hole, wherein the guide hole is located above the micro hole, and the micro hole includes three blades of the same size;

[0076] The spinneret is divided into two areas, A and B, with the diagonal line of the diamond as the dividing line. The positions of the A area and the B area of ​​the spinneret on two adjacent spinneret assemblies are opposite.

[0077] The spinneret holes in area A are Y-shaped spinnerets with convex points. Ten convex points of the same size are evenly distributed on each blade of the microhole. The height of the convex points is 0.05 mm, and the cone angle α of the convex points is 100°. The spinneret holes in area B are Y-shaped spinnerets without convex points.

[0078] There is a wind tube under each spinning assembly. The wind box where the wind tube is located is divided into 17 chambers. Each chamber is separated by a half circumference of the wind tube and two vertical plates connected to the two straight sides of the half circumference. The edges of the two vertical plates that are in contact with the wind tube and the inner wall of the wind box are respectively covered with sealing rubber sleeves to prevent the chambers from being disturbed by the wind pressure difference.

[0079] The orthographic projections of the two vertical plates on the spinneret above them are collinear with the boundary line between the two areas A and B on the spinneret;

[0080] The chamber corresponding to the A area of ​​the spinneret is recorded as chamber A, and the chamber corresponding to the B area of ​​the spinneret is recorded as chamber B. Chamber A is connected to the first air inlet duct, and chamber B is connected to the second air inlet duct. The first air inlet duct and the second air inlet duct are both connected to the main air duct. The first air inlet duct and the second air inlet duct are respectively installed with air inlet valve A and air inlet valve B.

[0081] The height of the windless zone corresponding to area A on the spinneret is 40 mm, and the cooling air pressure is 35 Pa;

[0082] The windless zone height corresponding to area B on the spinneret is 49 mm, and the cooling air pressure is 31 Pa;

[0083] A cylindrical base is arranged at the bottom of the wind tube, and an inverted rounded cone cylinder with a honeycomb hole structure is nested in the lower part of the cylindrical base, and the large end of the inverted rounded cone cylinder is fixedly connected to the cylindrical base;

[0084] The height of the cylindrical base is 12 cm and the wall thickness is 0.8 cm;

[0085] The height of the inverted cone cylinder of the honeycomb hole structure is 8 cm, the cone angle of the inverted cone is 10°, and the aperture of the honeycomb hole is 2 mm.

[0086] The final high-gloss shaped polyester filament had a relative radial profile of 52.6%, a breaking strength of 2.21 cN / dtex, a breaking strength variation coefficient of 2.45%, a breaking elongation of 119.6%, a breaking elongation variation coefficient of 1.3%, and a yarn unevenness CV value of 1.56%; the high-gloss shaped polyester filament was subjected to colorimetric testing, with the L value being 94.01 and the b value being 1.82.

[0087] Example 3

[0088] A method for preparing high-gloss-sensitive special-shaped polyester filaments, the specific process is as follows:

[0089] A high-gloss polyester melt with an intrinsic viscosity of 0.621 dL / g (PTA and EG with a mass ratio of 70:30 as raw materials, produced by esterification and polycondensation reaction in sequence) was extruded through a spinneret at 295°C, and then cooled, oiled and wound to obtain high-gloss profiled polyester filaments; wherein the cooling air temperature was 21.5°C and the cooling air humidity was 80%;

[0090] In the above process of preparing high-gloss profiled polyester filaments, a spinning position has a total of 10 spinnerets; the spinneret of each spinneret assembly is provided with 26 rows of Y-shaped spinneret holes arranged in a diamond shape, and any two adjacent rows of Y-shaped spinneret holes are staggered, and the number of holes in the spinneret is 268;

[0091] The Y-shaped spinneret includes a guide hole and a micro hole, wherein the guide hole is located above the micro hole, and the micro hole includes three blades of the same size;

[0092] The spinneret is divided into two areas, A and B, with the diagonal line of the diamond as the dividing line. The positions of the A area and the B area of ​​the spinneret on two adjacent spinneret assemblies are opposite.

[0093] The spinneret holes in area A are Y-shaped spinneret holes with convex points. Ten convex points of the same size are evenly distributed on each blade of the micropore. The height of the convex points is 0.04 mm, and the cone angle α of the convex points is 105°. The spinneret holes in area B are Y-shaped spinneret holes without convex points.

[0094] There is a wind tube under each spinning assembly. The interior of the wind box where the wind tube is located is divided into 11 chambers. Each chamber is separated by a half circumference of the wind tube and two vertical plates connected to the two straight sides of the half circumference. The edges of the two vertical plates that are in contact with the wind tube and the inner wall of the wind box are respectively covered with sealing rubber sleeves to prevent the chambers from being disturbed by the wind pressure difference.

[0095] The orthographic projections of the two vertical plates on the spinneret above them are collinear with the boundary line between the two areas A and B on the spinneret;

[0096] The chamber corresponding to the A area of ​​the spinneret is recorded as chamber A, and the chamber corresponding to the B area of ​​the spinneret is recorded as chamber B. Chamber A is connected to the first air inlet duct, and chamber B is connected to the second air inlet duct. The first air inlet duct and the second air inlet duct are both connected to the main air duct. The first air inlet duct and the second air inlet duct are respectively installed with air inlet valve A and air inlet valve B.

[0097] The height of the windless zone corresponding to area A on the spinneret is 45 mm, and the cooling air pressure is 36 Pa;

[0098] The windless zone height corresponding to area B on the spinneret is 55 mm, and the cooling air pressure is 30 Pa;

[0099] A cylindrical base is arranged at the bottom of the wind tube, and an inverted rounded cone cylinder with a honeycomb hole structure is nested in the lower part of the cylindrical base, and the large end of the inverted rounded cone cylinder is fixedly connected to the cylindrical base;

[0100] The height of the cylindrical base is 10 cm and the wall thickness is 1 cm;

[0101] The height of the inverted cone cylinder of the honeycomb hole structure is 7 cm, the cone angle of the inverted cone is 15°, and the aperture of the honeycomb hole is 1 mm.

[0102] The final high-gloss shaped polyester filament had a relative radial profile of 54.1%, a breaking strength of 2.23 cN / dtex, a breaking strength variation coefficient of 2.17%, a breaking elongation of 120.7%, a breaking elongation variation coefficient of 2.26%, and a yarn unevenness CV value of 1.64%; the high-gloss shaped polyester filament was subjected to colorimetric testing, with the L value being 91.3 and the b value being 1.59.

[0103] Example 4

[0104] A method for preparing high-gloss-sensitive special-shaped polyester filaments, the specific process is as follows:

[0105] A high-gloss polyester melt with an intrinsic viscosity of 0.623 dL / g (PTA and EG with a mass ratio of 70.3:29.7 as raw materials, produced by esterification and polycondensation reaction in sequence) was extruded through a spinneret at 297°C, and then cooled, oiled and wound to obtain high-gloss profiled polyester filaments; wherein the cooling air temperature was 22°C and the cooling air humidity was 82%;

[0106] In the above process of preparing high-gloss profiled polyester filaments, a spinning position has 12 spinnerets in total; the spinneret of each spinneret assembly is provided with 28 rows of Y-shaped spinneret holes arranged in a diamond shape, and any two adjacent rows of Y-shaped spinneret holes are staggered, and the number of holes in the spinneret is 288;

[0107] The Y-shaped spinneret includes a guide hole and a micro hole, wherein the guide hole is located above the micro hole, and the micro hole includes three blades of the same size;

[0108] The spinneret is divided into two areas, A and B, with the diagonal line of the diamond as the dividing line. The positions of the A area and the B area of ​​the spinneret on two adjacent spinneret assemblies are opposite.

[0109] The spinneret holes in area A are Y-shaped spinneret holes with convex points. Ten convex points of the same size are evenly distributed on each blade of the micropore. The height of the convex points is 0.03 mm, and the cone angle α of the convex points is 105°. The spinneret holes in area B are Y-shaped spinneret holes without convex points.

[0110] There is a wind tube under each spinning assembly. The wind box where the wind tube is located is divided into 13 chambers. Each chamber is separated by a half circumference of the wind tube and two vertical plates connected to the two straight sides of the half circumference. The edges of the two vertical plates that are in contact with the wind tube and the inner wall of the wind box are respectively covered with sealing rubber sleeves to prevent the chambers from being disturbed by the wind pressure difference.

[0111] The orthographic projections of the two vertical plates on the spinneret above them are collinear with the boundary line between the two areas A and B on the spinneret;

[0112] The chamber corresponding to the A area of ​​the spinneret is recorded as chamber A, and the chamber corresponding to the B area of ​​the spinneret is recorded as chamber B. Chamber A is connected to the first air inlet duct, and chamber B is connected to the second air inlet duct. The first air inlet duct and the second air inlet duct are both connected to the main air duct. The first air inlet duct and the second air inlet duct are respectively installed with air inlet valve A and air inlet valve B.

[0113] The height of the windless zone corresponding to area A on the spinneret is 45 mm, and the cooling air pressure is 36 Pa;

[0114] The windless zone height corresponding to area B on the spinneret is 55 mm, and the cooling air pressure is 31 Pa;

[0115] A cylindrical base is arranged at the bottom of the wind tube, and an inverted rounded cone cylinder with a honeycomb hole structure is nested in the lower part of the cylindrical base, and the large end of the inverted rounded cone cylinder is fixedly connected to the cylindrical base;

[0116] The height of the cylindrical base is 11 cm and the wall thickness is 0.8 cm;

[0117] The height of the inverted truncated cone cylinder of the honeycomb hole structure is 8 cm, the cone angle of the inverted truncated cone is 13°, and the aperture of the honeycomb hole is 2 mm.

[0118] The final high-gloss shaped polyester filaments had a relative radial profile of 51.9%, a breaking strength of 2.26 cN / dtex, a breaking strength variation coefficient of 1.89%, a breaking elongation of 118.7%, a breaking elongation variation coefficient of 2.78%, and a yarn unevenness CV value of 1.42%; the high-gloss shaped polyester filaments were subjected to colorimetric testing, with the L value being 91.92 and the b value being 1.85.

[0119] Example 5

[0120] A method for preparing high-gloss-sensitive special-shaped polyester filaments, the specific process is as follows:

[0121] A high-gloss polyester melt with an intrinsic viscosity of 0.63 dL / g (PTA and EG with a mass ratio of 70.5:29.5 as raw materials, produced by esterification and polycondensation reaction in sequence) was extruded through a spinneret at 293°C, and then cooled, oiled and wound to obtain high-gloss profiled polyester filaments; wherein the cooling air temperature was 21.5°C and the cooling air humidity was 85%;

[0122] In the above process of preparing high-gloss profiled polyester filaments, a spinning position has 12 spinnerets in total; the spinneret of each spinneret assembly is provided with 28 rows of Y-shaped spinneret holes arranged in a diamond shape, and any two adjacent rows of Y-shaped spinneret holes are staggered, and the number of holes in the spinneret is 288;

[0123] The Y-shaped spinneret includes a guide hole and a micro hole, wherein the guide hole is located above the micro hole, and the micro hole includes three blades of the same size;

[0124] The spinneret is divided into two areas, A and B, with the diagonal line of the diamond as the dividing line. The positions of the A area and the B area of ​​the spinneret on two adjacent spinneret assemblies are opposite.

[0125] The spinneret holes in area A are Y-shaped spinneret holes with convex points. Ten convex points of the same size are evenly distributed on each blade of the micropore. The height of the convex points is 0.03 mm, and the cone angle α of the convex points is 105°. The spinneret holes in area B are Y-shaped spinneret holes without convex points.

[0126] There is a wind tube under each spinning assembly. The wind box where the wind tube is located is divided into 13 chambers. Each chamber is separated by a half circumference of the wind tube and two vertical plates connected to the two straight sides of the half circumference. The edges of the two vertical plates that are in contact with the wind tube and the inner wall of the wind box are respectively covered with sealing rubber sleeves to prevent the chambers from being disturbed by the wind pressure difference.

[0127] The orthographic projections of the two vertical plates on the spinneret above them are collinear with the boundary line between the two areas A and B on the spinneret;

[0128] The chamber corresponding to the A area of ​​the spinneret is recorded as chamber A, and the chamber corresponding to the B area of ​​the spinneret is recorded as chamber B. Chamber A is connected to the first air inlet duct, and chamber B is connected to the second air inlet duct. The first air inlet duct and the second air inlet duct are both connected to the main air duct. The first air inlet duct and the second air inlet duct are respectively installed with air inlet valve A and air inlet valve B.

[0129] The height of the windless zone corresponding to area A on the spinneret is 45 mm, and the cooling air pressure is 35 Pa;

[0130] The windless zone height corresponding to area B on the spinneret is 55 mm, and the cooling air pressure is 30 Pa;

[0131] A cylindrical base is arranged at the bottom of the wind tube, and an inverted rounded cone cylinder with a honeycomb hole structure is nested in the lower part of the cylindrical base, and the large end of the inverted rounded cone cylinder is fixedly connected to the cylindrical base;

[0132] The height of the cylindrical base is 12 cm and the wall thickness is 0.9 cm;

[0133] The height of the inverted cone cylinder of the honeycomb hole structure is 7 cm, the cone angle of the inverted cone is 15°, and the aperture of the honeycomb hole is 3 mm.

[0134] The final high-gloss shaped polyester filament had a relative radial profile of 53.7%, a breaking strength of 2.25 cN / dtex, a breaking strength variation coefficient of 2.97%, a breaking elongation of 118.7%, a breaking elongation variation coefficient of 1.96%, and a yarn unevenness CV value of 1.31%; the high-gloss shaped polyester filament was subjected to colorimetric testing, with the L value being 92.76 and the b value being 1.97.

Claims

1. A method for preparing high-gloss profiled polyester filaments, characterized in that: After the high-gloss polyester melt is extruded through a spinneret, it is cooled, oiled and wound to obtain high-gloss special-shaped polyester filaments; The spinneret is provided with Y-shaped spinnerets arranged in a rhombus shape in multiple rows, and any two adjacent rows of Y-shaped spinnerets are arranged in a staggered manner; the spinneret is divided into two regions A and B with the diagonal line of the rhombus as the dividing line, the spinnerets in the A region are Y-shaped spinnerets with convex points, and the spinnerets in the B region are Y-shaped spinnerets without convex points; The Y-type spinneret includes a guide hole and a micro hole, the guide hole is located above the micro hole, the micro hole includes three blades of the same size, and the difference between the Y-type spinneret without convex points and the Y-type spinneret with convex points is that the three blades of the Y-type spinneret with convex points are all provided with a plurality of convex points; The height of the windless zone corresponding to area A on the spinneret is 35~45mm, and the cooling air pressure is 34~36Pa; the height of the windless zone corresponding to area B on the spinneret is 45~55mm, and the cooling air pressure is 29~31Pa.

2. The method for preparing high-gloss profiled polyester filaments according to claim 1, characterized in that: Ten convex points of the same size are evenly distributed on each blade of the Y-shaped spinneret with convex points, the height of the convex points is 0.02-0.05 mm, and the cone angle α of the convex points is 100°-110°.

3. The method for preparing high-gloss profiled polyester filaments according to claim 1, characterized in that: There are 8 to 16 spinnerets in one spinning position, and the A area and B area of ​​the spinneret on two adjacent spinnerets are in opposite positions; There is a wind tube corresponding to each spinneret assembly below, and the interior of the wind box where the wind tube is located is divided into multiple chambers, and each chamber is separated by a semi-circumferential surface of the wind tube and two vertical plates connected to two straight sides of the semi-circumferential surface, and the orthographic projections of the two vertical plates on the spinneret above them are collinear with the boundary line between the two areas A and B on the spinneret; The chamber corresponding to the A area of ​​the spinneret is recorded as chamber A, and the chamber corresponding to the B area of ​​the spinneret is recorded as chamber B. Chamber A is connected to the first air inlet duct, and chamber B is connected to the second air inlet duct. The first air inlet duct and the second air inlet duct are connected to the main air duct, and air inlet valves are respectively installed on the first air inlet duct and the second air inlet duct.

4. The method for preparing high-gloss profiled polyester filaments according to claim 1, characterized in that: The number of holes in the spinneret is 192~288.

5. The method for preparing high-gloss profiled polyester filaments according to claim 4, characterized in that: A cylindrical base is arranged at the bottom of the wind tube, an inverted rounded cone cylinder with a honeycomb hole structure is nested in the lower part of the cylindrical base, and the large end of the inverted rounded cone cylinder is fixedly connected to the cylindrical base.

6. The method for preparing high-gloss profiled polyester filaments according to claim 5, characterized in that: The height of the cylindrical base is 8~12cm and the wall thickness is 0.5~1cm; The height of the inverted cone cylinder of the honeycomb hole structure is 5~8cm, the cone angle of the inverted cone is 5°~15°, and the aperture of the honeycomb hole is 1~3mm.

7. The method for preparing high-gloss profiled polyester filaments according to claim 1, characterized in that: The intrinsic viscosity of the bright polyester melt is 0.61~0.63dL / g.

8. A high-gloss profiled polyester filament prepared by the preparation method according to any one of claims 1 to 7, characterized in that: The relative radial profile of high-gloss profiled polyester filaments is ≥50%, the breaking strength is ≥1.80cN / dtex, the breaking strength variation coefficient is ≤4.00%, the breaking elongation is 118~122%, the breaking elongation variation coefficient is ≤4.00%, and the CV value of the yarn unevenness is ≤1.8%; The chromaticity of the high-gloss profiled polyester filaments was tested, with the L value ≥ 90% and the b value being 1~2.

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