A preparation device and method for breathable and easy-to-dye polyester special-shaped DTY

Abstract

The present invention relates to a device and method for preparing breathable and easy-to-dye polyester special-shaped DTY. The device includes a cooling device, which is an inverted gourd-shaped air duct; the inverted gourd-shaped air duct is composed of a hollow bowl-shaped column section, a hollow cylindrical section, and a hollow trumpet-shaped column section connected in sequence from top to bottom; the above device is used to prepare breathable and easy-to-dye polyester special-shaped DTY using POY raw yarn as raw material and a DTY process; the DTY process flow includes: POY raw yarn → heating by a pre-network heating device → heating by a first wire feeding roller → pre-cooling → cooling by a cooling device → pre-oiling → false twisting deformation → second wire feeding roller → middle network → auxiliary roller → shaping hot box → shaping overfeeding → oiling by oiling ring spraying → winding and forming by a winding machine. The design of the inverted gourd-shaped air duct in the device of the present invention adjusts the cooling water flow of each chamber, so that the cooling temperature of the silk strips is gradually reduced when passing through each cooling chamber; the method of the present invention ensures the uniformity of cooling and heating of the silk strips, and the uniform dyeing of the silk strips.

Description

Technical Field

[0001] The present invention belongs to the technical field of fibers, and relates to a preparation device and method for breathable and easily dyeable polyester profiled DTY. Background Art

[0002] With the increasing living standards and people's yearning for a better life, the requirements for the comfort and functionality of clothes have also increased. The fabrics processed from conventional polyester varieties have limitations in terms of elasticity, breathability, functionality, etc. Polyester fine denier porous profiled filaments, due to their unique properties, such as profiled cross-sections, large specific surface areas, good moisture absorption and sweat discharge performance, result in very good softness and breathability of the woven fabric surface, and the fabric is also light and thin, making it very comfortable to wear. However, due to the special cross-section of the profiled fiber, rapid cooling under strong cold can keep the profiled degree at a relatively high level, but it will cause excessive cooling of the single filaments on the outer surface of the filament, and the outer single filaments will break during stretching; reducing the cooling temperature and wind speed will narrow the temperature difference between the inside and outside of the filament, and the cooling will be more uniform. However, due to the large specific surface area of the profiled filament, the frictional resistance with air is large, and when the wind speed decreases, under the action of the stretching force, there will be a tendency for the profiled cross-section to form a circular cross-section, resulting in poor profiled degree of the filament during the stretching process. Therefore, in the prior art, during the cooling process of profiled filaments, it is impossible to keep the temperature difference between the inside and outside of the filament small while maintaining a high profiled degree. Therefore, the dyeing rate of profiled filaments and the mechanical properties (breaking elongation and breaking strength) of the filaments cannot be taken into account.

[0003] Patent CN112708976B adopts a ring blowing cooling process to simultaneously cool the filament with air from all around. Its cooling effect can be controlled by factors such as the temperature and wind speed of the ring blowing to achieve the best cooling effect, and the cooling is uniform. Compared with a cooling plate, its cooling effect can be improved by more than 10%, thus ensuring the profiled degree of the filament during the stretching process, improving the dye uptake rate of the fiber, and the products prepared by this method have good mechanical properties. However, ring blowing cooling cools the entire filament. Since the cooling device is vertically installed on the texturing machine and the cooling device is relatively long, due to the attenuation of the cooling air after rectification, the cooling wind speed at the upper end of the air duct is less than that at the lower end, resulting in a large cooling deviation between different sections of the filament due to the long cooling distance, leading to unstable crimp structure, unstable tension, and a large tension CV value.

[0004] Therefore, it is of great significance to study a preparation device and method for breathable and easily dyeable polyester profiled DTY to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and provide a preparation device and method for breathable and easily dyeable polyester profiled DTY.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A device for preparing breathable and easily dyeable polyester profiled DTY, including a cooling device, and the cooling device is an inverted gourd-shaped air duct;

[0008] The inverted gourd shape is composed of a hollow bowl-shaped column section, a hollow cylindrical section, and a hollow trumpet-shaped column section that are connected in sequence from top to bottom;

[0009] The hollow bowl-shaped column section is obtained by rotating a generatrix I around the axis for one week. The generatrix I is an arc section, and the convex direction of the arc section deviates from the central axis;

[0010] The hollow cylindrical section is obtained by rotating a generatrix II around the axis for one week. The generatrix II is a straight line section;

[0011] The hollow trumpet-shaped column section is obtained by rotating a generatrix III around the axis for one week. The generatrix III is an arc section, and the convex direction of the arc section faces the central axis; the upper bottom of the hollow bowl-shaped column section is larger than the cross-section of the hollow cylindrical section, and the lower bottom of the hollow trumpet-shaped column section is smaller than the cross-section of the hollow cylindrical section;

[0012] The inverted gourd-shaped air duct includes an inverted gourd-shaped outer cylinder and an inverted gourd-shaped inner cylinder. A cavity is formed between the inverted gourd-shaped outer cylinder and the inverted gourd-shaped inner cylinder, and is closed by an upper bottom plate and a lower bottom plate;

[0013] The cavity is divided into three sections by a circular ring plate I and a circular ring plate II; the upper surface of the hollow bowl-shaped column section of the inverted gourd-shaped outer cylinder, the upper surface of the hollow bowl-shaped column section of the inverted gourd-shaped inner cylinder, the upper bottom plate, and the upper surface of the circular ring plate I enclose a slow cooling chamber; the hollow cylindrical section of the inverted gourd-shaped outer cylinder, the hollow cylindrical section of the inverted gourd-shaped inner cylinder, the lower surface of the circular ring plate I, and the upper surface of the circular ring plate II enclose a flat cooling chamber; the hollow trumpet-shaped column section of the inverted gourd-shaped outer cylinder, the hollow trumpet-shaped column section of the inverted gourd-shaped inner cylinder, the lower surface of the circular ring plate II, and the lower bottom plate enclose a collecting cooling chamber;

[0014] The inverted gourd-shaped outer cylinder is provided with an inlet I, an inlet II, an inlet III, an outlet I, an outlet II, and an outlet III;

[0015] The inlet I and the outlet I are respectively used to input and output cooling water to and from the slow cooling chamber;

[0016] The inlet II and the outlet II are respectively used to input and output cooling water to and from the flat cooling chamber;

[0017] The inlet III and the outlet III are respectively used to input and output cooling water to and from the collecting cooling chamber;

[0018] A plurality of hollow cylinders I (i.e., cooling air holes) penetrating the inverted gourd-shaped air duct are evenly distributed on the circumferential surface of the inverted gourd-shaped air duct; among them, one end of the hollow cylinder I is hermetically connected to the inverted gourd-shaped outer cylinder, and the other end of the hollow cylinder I is hermetically connected to the inverted gourd-shaped inner cylinder;

[0019] The hollow cylinder I provided on the hollow bowl-shaped column section is inclined downward, preferably with the blowing direction inclined downward by 45°. The hollow cylinder I provided on the hollow cylindrical section is in the horizontal direction, that is, the blowing direction is in the horizontal direction. The hollow cylinder I provided on the hollow horn-shaped column section is inclined upward, preferably with the blowing direction inclined upward by 60°.

[0020] In the ring blowing cooling of the prior art, the cooling air cools the overall filament in the cooling device. Since the cooling device is vertically installed on the texturing machine and the cooling device is relatively long, there will be a large cooling deviation between sections of the filament due to the long cooling distance. This is mainly because the cooling air attenuates after rectification, resulting in a lower cooling air speed at the upper end of the air duct than at the lower end. However, the cooling device of the present invention is a segmented air duct, and mainly controls the cooling temperature by the flow rate of cooling water. Under the condition of constant air supply speed, the blowing cooling temperature is controlled by adjusting the water flow rate of each section to keep the temperature difference between each point on the axis of the cooling air small for cooling the filament. Therefore, there will be no problem of large cooling deviation between sections as in the prior art, making the filament crimp structure stable and the tension stable.

[0021] The design of the inverted gourd-shaped cooling cylinder makes the wind pressure of the cooling air in the axial direction of the cooling cylinder increase step by step from top to bottom. At the same time, by adjusting the cooling water flow rate of each chamber, the cooling temperature of the filament decreases step by step when passing through each cooling chamber. When the molecular chain of the filament is active, the upper section (the part above the circular ring plate I) of the inverted gourd-shaped air duct prevents the surface and inner layer temperature difference of the filament from being too large and the tensile property from deteriorating and causing hairiness problems due to excessive cooling wind pressure or too low initial cooling temperature. In the middle section (the part between the circular ring plate I and the circular ring plate II) of the inverted gourd-shaped air duct, the filament is blown horizontally to improve the cooling efficiency and prevent the profile degree from decreasing significantly due to insufficient cooling. In the lower section (the part below the circular ring plate II) of the inverted gourd-shaped air duct, the cooling air converges in the cold collection chamber. At this time, the activity of the macromolecules inside the filament has decreased significantly, and sufficient cooling is given to ensure that the profile degree of the filament remains at a high level.

[0022] In the gourd-shaped design of the present invention, the generatrices of the hollow bowl-shaped column section and the hollow horn-shaped column section are arc segments, and the convex directions of the arc segments are opposite. This is mainly because when the filament enters the cooling air duct for cooling after being heated, the molecular chain is in three stages:

[0023] First, the wire has just come out of the heat box, the temperature is high, the molecular chain is abnormally active, the wind temperature and wind pressure have a huge impact on the wire, strong cooling and fast cooling will cause uneven cooling inside and outside the wire, increase tensile stress, and increase broken ends and hairy wires. Based on this, the inverted gourd-shaped inner cylinder at this stage is designed as a hollow bowl-shaped column, the side is far away from the wire, the cooling cavity space is large, the wire inlet diameter is large, the extension line of the lower end of the busbar is at an acute angle to the axis, and the cooling wind is blown obliquely downward, mainly because the special-shaped wire has a large specific surface area and excellent heat absorption and heat dissipation performance. In this way, the cooling wind does not blow directly to the wire, which can not only reduce disturbances, but also does not affect the cooling effect of the wire;

[0024] Second, after a period of cooling, the molecular chain gradually stabilizes. At this time, by increasing the wind pressure, the cooling wind is rectified and blown to the wire in a laminar state, so that the wire is cooled as quickly as possible, which is conducive to maintaining the shape of the wire; in this stage, the wire is directly cooled by laminar cooling after rectification, the wind pressure is increased, the wind temperature is reduced, and the wire is quickly cooled to near the glass transition temperature to prevent the shape from decreasing too much under the action of stretching;

[0025] Third, at the end of cooling, the crystallization inside the wire tends to be stable, and the wire temperature is stable at the glass transition temperature. The wind pressure and wind temperature have little effect on the activity of the molecular chain. By reducing the cooling outlet, the wind pressure is further increased, and the wind temperature is further reduced. Affected by the structure of the cooling duct, the cooling wind is concentrated in this section of the cooling duct, so that the inner and outer layers of the wire are fully and evenly cooled, which not only further ensures the profile of the wire, but also prevents uneven dyeing caused by uneven crystallization in the later stage; this section of cooling wind is tilted upward, which can prevent the wind from the upper and middle sections from being discharged too quickly, so that the cooling wind from the upper, middle and lower sections is collected in the cold collection chamber. At this time, the macromolecular activity inside the wire has been greatly reduced, and a large amount of cooling wind can give the wire sufficient cooling to ensure that the profile of the wire remains at a high level.

[0026] The reason why the upper and lower sections of the inverted gourd-shaped device of the present invention are designed in arcs instead of straight lines is that in a straight line design, there are bulges or corners at the junction of each section. When the wind travels along the inner wall, it will cause local turbulence due to the bulges (the upper section and the middle section form a protruding acute angle) or corners (the middle section and the lower section), which will affect the uniformity of the overall wind speed and cause uneven heating of the silk strips.

[0027] As the preferred technical solution:

[0028] As described above, the breathable and easy-to-dye polyester special-shaped DTY preparation device, the upper bottom plate and the lower bottom plate are both circular plates; the ratio of the outer diameter of the upper bottom plate to the circular plate I is 3:2; the outer diameters of the circular plate I and the circular plate II are the same; the ratio of the outer diameters of the circular plate II and the lower bottom plate is 2:1; the ratio of the inner diameters of the upper bottom plate to the circular plate I is 5:3; the inner diameters of the circular plate I and the circular plate II are the same; the ratio of the inner diameters of the circular plate II and the lower bottom plate is 3:1.

[0029] A preparation device for breathable and easily dyeable polyester profiled DTY as described above, the outer diameter of the circular ring plate I is 40 - 50 mm; the inner diameter of the circular ring plate I is 30 - 40 mm; the distance between the upper bottom plate and the circular ring plate I is 200 - 300 mm; the distance between the circular ring plate I and the circular ring plate II is 300 - 400 mm; the distance between the circular ring plate II and the lower bottom plate is 500 - 600 mm.

[0030] A preparation device for breathable and easily dyeable polyester profiled DTY as described above further includes a pre-network heating device;

[0031] The pre-network heating device (i.e., the heating cylinder) is a hollow cylinder II, and there are 2 sealed hollow cylindrical interlayers between the inner wall and the outer wall of the hollow cylinder II, which are respectively denoted as the outer interlayer and the inner interlayer;

[0032] The upper bottom surface of the outer interlayer is provided with an outlet IV, and the lower bottom surface is provided with an inlet IV. The inlet IV and the outlet IV are respectively used for inputting and outputting heated diphenyl to heat the compressed air;

[0033] The upper bottom surface of the inner interlayer is provided with an air outlet, and the lower bottom surface is provided with an air inlet. The air inlet and the air outlet are respectively used for inputting and outputting compressed air. There is an irregular mixing plate between the air outlet and the air inlet. Compressed air is introduced into the air inlet. After the compressed air is evenly heated through the mixing plate, it exits from the air outlet;

[0034] A hollow tube is arranged in the outer interlayer. One end of the hollow tube is communicated with the air outlet, and the other end passes through the inner interlayer and is communicated with the inside of the hollow cylinder II to form a nozzle II; a branch pipe is arranged on the peripheral surface of the hollow tube. One end of the branch pipe is communicated with the hollow tube, and the other end passes through the inner interlayer and is communicated with the inside of the hollow cylinder II to form a nozzle I;

[0035] The nozzle I and the nozzle II are circular holes, and the ratio of the diameters is 2:3;

[0036] A double nozzle is arranged in the heating cylinder. The externally connected compressed air is evenly heated in the inner interlayer of the heating cylinder and then enters the pipeline in the outer interlayer of the heating cylinder, and is respectively sprayed out from the nozzles to blow open the multifilament, so that the hot air evenly heats the single filaments. Through reasonable pressure setting, such as 0.002 - 0.003 MPa, the filaments can be blown apart but no network points are formed. And at the lower end, due to the larger nozzle aperture, the flow velocity formed by the compressed air is further reduced, which can protect the structure of the already heated filaments to be stable; in addition, the inner interlayer of the heating cylinder still has a heating effect on the filaments passing through the pre-network heating device;

[0037] With such a design, it is possible to eliminate the problems in the prior art that when heating multifilaments (especially profiled filaments), the temperature of the outer part of the filaments is higher than that of the inner part of the filaments, the filaments are unevenly heated, and the dyeing M rate of the profiled filaments is low;

[0038] Furthermore, a temperature tester is provided between the air outlet and the hollow tube. The flow rate of the biphenyl is controlled by a solenoid valve. A feedback circuit is formed between the biphenyl flow rate in the heating cylinder and the temperature tester. When the monitored temperature is lower than the set temperature, a signal is fed back to the solenoid valve to increase the opening degree. Conversely, the opening degree of the solenoid valve is decreased.

[0039] A preparation device for breathable and easily dyeable polyester profiled DTY as described above further includes an oiling device, oil pipe I, oil pipe II, and oil pipe III; the oiling device includes an oiling ring, an oil guiding wire device I, and an oil guiding wire device II;

[0040] The oiling ring is a circular ring with a notch; the circular ring with a notch is a hollow structure; the outer diameter of the circular ring is 50 - 60 mm, and the inner diameter is 5 - 6 mm;

[0041] A rectifying plate is provided inside the oiling ring; uniformly distributed rectifying holes are provided on the rectifying plate, and the diameter of the rectifying holes is 1 - 1.2 mm; the rectifying plate divides the interior of the oiling ring into a rectifying chamber and a voltage stabilizing chamber in the radial direction from the inside to the outside;

[0042] The inner wall of the oiling ring is uniformly provided with oiling holes, and the diameter of the oiling holes is 0.5 - 0.6 mm; the outer wall of the oiling ring is connected to oil pipe I through a hollow connecting rod;

[0043] Since there are multiple oiling holes on the oiling ring, a "hindrance" needs to be formed by the rectifying plate so that the oil agent first fills the voltage stabilizing chamber. In this way, the oil pressure at each point of the rectifying plate is the same, and then the oil pressure of the oil agent flowing from the voltage stabilizing chamber through the rectifying plate into the rectifying chamber is uniform. The function of the rectifying chamber is basically the same as that of the voltage stabilizing chamber. The oil agent is further mixed and equalized in the rectifying chamber, and the pressure when extruded from the oiling holes will also be uniform, achieving the purpose of uniform oiling; the design of the oil ring is for non-contact oiling, reducing friction;

[0044] The oil guiding wire device I is a U-shaped ceramic part that is narrower at the top and wider at the bottom. The width of the narrowest part is 1 - 1.5 mm, and the width of the widest part is 2 - 3 mm. A through hole with a diameter of 0.7 - 1 mm is provided at the bottom of the U-shaped ceramic part. The through hole of the oil guiding wire device I is connected to oil pipe II through a hollow connecting rod;

[0045] The shape of the oil guiding wire device II is the same as that of the oil guiding wire device I. The through hole of the oil guiding wire device II is connected to oil pipe III through a hollow connecting rod;

[0046] The oiling ring is arranged before the winding machine and is used for spraying oil when the tow passes through the oiling ring;

[0047] The oil guiding wire device I is arranged before the cooling device and is used for pre-cooling the tow with an oil agent;

[0048] The oil guiding wire device II is arranged after the cooling device and is used for pre-oiling the tow with an oil agent.

[0049] The present invention also provides a method for preparing a breathable and easily dyeable polyester profiled DTY, which uses a device for preparing a breathable and easily dyeable polyester profiled DTY as described above; using POY raw silk as raw material, a breathable and easily dyeable polyester profiled DTY is prepared by DTY process; the DTY process flow includes: POY raw silk → pre-network heating device heating → first feeding roller → pre-cooling → cooling device cooling → pre-oiling → false twist deformation → second feeding roller → middle network → auxiliary roller → setting hot box → setting overfeed → oiling ring spraying oil → winding machine winding and forming;

[0050] The device used for pre-cooling is oiling guide I, and the oil agent used by oiling guide I is a mixture of crude oil (brand: Zhejiang Transfar, specification TF-702L, concentration 100%) and water, and the concentration of crude oil in the oil agent is 30-40%;

[0051] Selecting this kind of oil agent for the pre-cooling process can not only ensure good pre-cooling effect, but also reduce the friction between the filament and the guide; because the molecular state of oil is organic chain-shaped, the surface tension of oil is very large, and the oil on the surface of the filament will form an oil film, cutting off contact with the guide, and will form a floating state, reducing friction; while the molecular state of water is an independent slightly chain-shaped state, the surface tension of water is very small, and when there is water on the surface of the filament, it will not be in contact with the filament state, but instead wash away the particles on the surface of the filament, reducing friction, and the heat conduction effect of water is better, and the cooling of the filament is more uniform and efficient, but long-term use of water cooling will cause corrosion to the equipment, so a mixture of oil and water is used here;

[0052] The device used for pre-oiling is oiling guide II, and the oil agent used by oiling guide II is crude oil (brand: Zhejiang Transfar, specification TF-702L, concentration 100%), and the main purpose is to improve the bundling property of the filament before false twist deformation and reduce the friction in the filament path at the same time.

[0053] As a preferred technical solution:

[0054] In the method for preparing a breathable and easily dyeable polyester profiled DTY as described above, the cross-section of the POY raw silk is trilobal, cruciform, pentafoil and H-shaped.

[0055] A method for preparing a breathable and easily dyeable polyester profiled DTY as described above, the process parameters including: the temperature of diphenyl being 200 - 250 °C; the pre-network pressure being 0.03 - 0.04 MPa; the temperature of cooling water being 18 - 22 °C, and the cooling wind speed being 0.3 - 0.5 m / s (the cooling wind speed here is the set wind speed, and the actual wind speed is affected by the structure of the cooling device); the flow rate of cooling water in the slow cooling chamber being 2 - 2.5 m / s, the flow rate of cooling water in the flat cooling chamber being 2.5 - 3 m / s, and the flow rate of cooling water in the collective cooling chamber being 3 - 3.5 m / s; the false twist deformation adopting polyurethane discs with a combination of 1 - 4 - 1, and the D / Y ratio being 1.4 - 1.6 (the D / Y ratio is the ratio of the surface speed of the friction disc to the speed of the filament leaving the false twister); the ratio of the speed of the second feed roller to the speed of the first feed roller being 1.53 - 1.58, and the processing speed of the second feed roller being 500 - 600 m / min; the medium network air pressure being 0.07 - 0.18 MPa; the overfeed rate of the setting overfeed being -3.0 - -6.0%; the winding angle (also called the crossover angle) being 25° - 28°, and the forming cone angle being 65° - 70°; the oil agent used for the oiling ring being crude oil (brand: Zhejiang Chuanhua, specification TF - 702L, concentration 100%), and the oiling pressure of the oiling ring being 0.003 - 0.004 MPa; the oiling pressure of the oiling wire guide I being 0.001 - 0.002 MPa; the oiling pressure of the oiling wire guide II being 0.001 - 0.002 MPa.

[0056] A method for preparing a breathable and easily dyeable polyester profiled DTY as described above, the single filament fineness of the breathable and easily dyeable polyester profiled DTY being ≤ 0.55 dtex, the breaking elongation being 20.5 - 23%, the breaking strength being 3.95 - 4.15 cN / dtex, the CV value of oil content being 3.0 - 5.5%, the profile degree being 45 - 50%, the dyeing M rate being 98 - 99.5%, and the tension CV value being 0.88 - 1.07%.

[0057] Beneficial effects:

[0058] (1) For the device for preparing a breathable and easily dyeable polyester profiled DTY of the present invention, the design of the inverted gourd - shaped air duct makes the wind pressure of the cooling wind in the axial direction of the cooling cylinder increase step - by - step from top to bottom. At the same time, by adjusting the cooling water flow rate in each chamber, the cooling temperature of the filament decreases step - by - step when passing through each cooling chamber.

[0059] (2) For the method for preparing a breathable and easily dyeable polyester profiled DTY of the present invention, adopting the inverted gourd - shaped air duct cooling and single - filament heating process improves the cooling and heating efficiency, ensures the cooling and heating uniformity of the filament, enhances the dyeing M rate of the fiber, and the filament is evenly dyed; and adding a pre - oiling process improves the filament's cohesion, reduces the friction between the filament and the filament path, and reduces the breakage rate.

[0060] (3)Preparation method of a breathable and easily dyeable polyester profiled DTY of the present invention. In the DTY process, an oiling combination is adopted. When oiling, on the one hand, an annular oiling method that does not contact the filament is used, and on the other hand, an oiling ring with a hollow structure is used. Through the lubrication of the sizing agent, the frictional damage to the filament can be reduced, the resistance during the movement of the filament can be decreased, the hairiness and breakage of the filament can be reduced, and the uniformity of oiling can also be well controlled, with a small CV value of the oil content of the filament. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 is the process flow chart of the present invention;

[0062] Figure 2 is the schematic structural diagram of the pre-network heating device of the present invention;

[0063] Figure 3 is the schematic layout diagram of the mixing flow plate of the pre-network heating device of the present invention;

[0064] Figure 4 is the schematic structural diagram of the cooling device of the present invention;

[0065] Figure 5 is the schematic diagram when the filament is cooled;

[0066] Figure 6 is the schematic structural diagram of the oiling ring of the present invention;

[0067] Figure 7 is the cross-sectional view of the oiling ring when the cross-section of the POY raw filament of the present invention is cross-shaped;

[0068] Figure 8 is the schematic cross-sectional diagram of the "U-shaped porcelain part" of the present invention;

[0069] Figure 9 is the schematic structural diagram of the hollow bowl-shaped column section of the cooling device of the present invention;

[0070] Figure 10 is the schematic structural diagram of the hollow cylindrical section of the cooling device of the present invention;

[0071] Figure 11 is the schematic structural diagram of the hollow trumpet-shaped column section of the cooling device of the present invention;

[0072] Figure 12 is the shape of the cross-shaped spinneret hole of the present invention;

[0073] Figure 13 is the shape of the I-shaped spinneret hole of the present invention;

[0074] Figure 14 is the shape of the three-leaf-shaped spinneret hole of the present invention;

[0075] Figure 15 is the shape of the five-leaf-shaped spinneret hole of the present invention;

[0076] Figure 16 Schematic diagram of the oiling and wire guiding device corresponding to the pre-cooling process and pre-oiling process of the present invention;

[0077] Figure 17 Front view schematic diagram of the ring blowing cooling device of the prior art (CN112708976B);

[0078] Figure 18 Right view schematic diagram of the ring blowing cooling device of the prior art (CN112708976B);

[0079] Figure 19 Schematic diagram of the cooling plate structure of the prior art;

[0080] Among them, 1 - filament, 3 - first wire feeding roller, 4 - heating cylinder, 4.1 - air inlet, 4.2 - air outlet, 4.3 - inlet flow port IV, 4.4 - outlet flow port IV, 4.5 - inner sandwich layer, 4.6 - outer sandwich layer, 4.7 - mixing plate, 4.8 - hollow tube, 4.9 - nozzle I, 4.10 - nozzle II, 5 - cooling device, 5.1 - oiling and wire guiding device I, 5.2 - oiling and wire guiding device II, 5.3 - slow cooling chamber, 5.4 - flat cooling chamber, 5.5 - collective cooling chamber, 5.31 - inlet flow port I, 5.41 - inlet flow port II, 5.51 - inlet flow port III, 5.32 - outlet flow port I, 5.42 - outlet flow port II, 5.52 - outlet flow port III, 6 - false twister, 7 - second wire feeding roller, 8 - middle network, 9 - auxiliary roller, 10 - shaping hot box, 11 - shaping wire feeding roller, 12 - oiling device, 12.1 - oiling ring, 12.2 - pressure stabilizing chamber, 12.3 - rectifying plate, 12.4 - rectifying hole, 12.5 - rectifying chamber, 12.6 - oiling hole, 13 - winding machine. Specific embodiments

[0081] The following further elaborates the present invention in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not 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 also fall within the scope defined by the appended claims of this application.

[0082] The test method involved in the present invention is as follows:

[0083] Fineness (linear density): According to the standard of "GB / T 14460 - 2015 Polyester drawn textured yarn", a length measuring instrument (YG086 type skein length measuring instrument of Changzhou Textile Instrument Factory) is used. The length measuring instrument winds the silk of a specified length, and then its weight is weighed with a balance, and it is converted into the fineness of the silk, that is, the linear density, according to the formula; the formula is: linear density (dtex) = X 1 / L × 10000, where the linear density is in decitex (dtex); X 1 is the test weight of the sample in grams (g); L is the length of the sample in meters (m).

[0084] Breaking strength and elongation at break: According to the standard of "GB / T 14460-2015 Polyester drawn textured yarn", using a fully automatic single yarn strength tester (manufactured by Changzhou Textile Instrument Factory Co., Ltd., model YG023B-Ⅲ), the fiber is pulled to break under the condition of constant speed and uniform tension, and the breaking strength and elongation at break of the sample are obtained from the data display.

[0085] CV value of oil content: According to "GB / T 8960-2015 Polyester drawn yarn", using a nuclear magnetic resonance fiber oiling rate measuring instrument, a section of fiber is selected according to the nuclear magnetic resonance method to test the oiling rate (oil content) of the filament, and the average value and standard deviation of the fiber oil content of the same spinning position are calculated, and finally the CV value of oil content is obtained.

[0086] Degree of profile: The test method for the degree of profile is the test method for the degree of profile of chemical fibers, specifically the textile industry standard of the People's Republic of China FZ-T5002-2013: Relative radial profile Dr = (1 - r / R) * 100%; where r is the radius of the inscribed circle of the cross-section of the chemical fiber, and R is the radius of the circumscribed circle of the cross-section of the chemical fiber.

[0087] Dyeing M rate: According to the standard of "GB / T 14460-2015 Polyester drawn textured yarn", calculate the proportion of the filaments with a dyeing uniformity gray scale reaching level 4.0 and above in all dyed DTY filaments to obtain the dyeing M rate.

[0088] Tension CV value: Using the UNITENS tension monitoring system on the Barmag efk-1000 texturing machine in Suzhou, when the filament passes through the tension meter of the texturing machine, the UNITENS tension monitoring system will automatically detect the filament tension of each spindle position and automatically calculate the tension CV value.

[0089] Evaluation of DTY appearance hairiness: According to "GB / T 14460-2015 Polyester drawn textured yarn", grade the DTY yarn cones.

[0090] A preparation device for breathable and easily dyed polyester profiled DTY, as Figures 2 to 11 、 Figure 16 shown, including a cooling device, a pre-network heating device, an oiling device, oil pipe I, oil pipe II and oil pipe III;

[0091] The cooling device is an inverted gourd-shaped air duct; the inverted gourd shape is composed of a hollow bowl-shaped column section, a hollow cylindrical section and a hollow trumpet-shaped column section connected in sequence from top to bottom;

[0092] The hollow bowl-shaped column section is obtained by rotating the generatrix I around the axis for one week. The generatrix I is an arc section, and the convex direction of the arc section deviates from the central axis;

[0093] The hollow cylindrical column section is obtained by rotating the generatrix II around the axis for one week. The generatrix II is a straight line section;

[0094] The hollow trumpet-shaped column section is obtained by rotating the generatrix III around the axis for one week. The generatrix III is an arc section, and the convex direction of the arc section faces the central axis; the upper bottom of the hollow bowl-shaped column section is larger than the cross-section of the hollow cylindrical column section, and the lower bottom of the hollow trumpet-shaped column section is smaller than the cross-section of the hollow cylindrical column section;

[0095] The inverted gourd-shaped air duct includes an inverted gourd-shaped outer cylinder and an inverted gourd-shaped inner cylinder. A cavity is formed between the inverted gourd-shaped outer cylinder and the inverted gourd-shaped inner cylinder, and is closed by an upper bottom plate and a lower bottom plate; both the upper bottom plate and the lower bottom plate are circular ring plates;

[0096] The cavity is divided into three sections by the circular ring plate I and the circular ring plate II; the ratio of the outer circle diameter of the upper bottom plate to that of the circular ring plate I is 3:2; the outer circle diameters of the circular ring plate I and the circular ring plate II are the same; the ratio of the outer circle diameter of the circular ring plate II to that of the lower bottom plate is 2:1; the ratio of the inner circle diameter of the upper bottom plate to that of the circular ring plate I is 5:3; the inner circle diameters of the circular ring plate I and the circular ring plate II are the same; the ratio of the inner circle diameter of the circular ring plate II to that of the lower bottom plate is 3:1; the outer circle diameter of the circular ring plate I is 40 - 50 mm; the inner circle diameter of the circular ring plate I is 30 - 40 mm; the distance a between the upper bottom plate and the circular ring plate I is 200 - 300 mm; the distance b between the circular ring plate I and the circular ring plate II is 300 - 400 mm; the distance c between the circular ring plate II and the lower bottom plate is 500 - 600 mm;

[0097] The upper surface of the hollow bowl-shaped column section of the inverted gourd-shaped outer cylinder, the hollow bowl-shaped column section of the inverted gourd-shaped inner cylinder, the upper bottom plate and the circular ring plate I enclose a slow cooling chamber 5.3; the lower surface of the hollow cylindrical column section of the inverted gourd-shaped outer cylinder, the hollow cylindrical column section of the inverted gourd-shaped inner cylinder, the lower surface of the circular ring plate I and the upper surface of the circular ring plate II enclose a flat cooling chamber 5.4; the lower surface of the hollow trumpet-shaped column section of the inverted gourd-shaped outer cylinder, the hollow trumpet-shaped column section of the inverted gourd-shaped inner cylinder, the lower surface of the circular ring plate II and the lower bottom plate enclose a collecting cooling chamber 5.5;

[0098] The inverted gourd-shaped outer cylinder is provided with an inlet I 5.31, an inlet II 5.41, an inlet III 5.51, an outlet I 5.32, an outlet II 5.42 and an outlet III 5.52;

[0099] The inlet I 5.31 and the outlet I 5.32 are respectively used for inputting and outputting cooling water to and from the slow cooling chamber 5.3;

[0100] The inlet port II 5.41 and the outlet port II 5.42 are respectively used to input and output cooling water to and from the horizontal cooling chamber 5.4;

[0101] The inlet port III 5.51 and the outlet port III 5.52 are respectively used to input and output cooling water to and from the collective cooling chamber 5.5;

[0102] A plurality of hollow cylinders I (i.e., cooling air holes) penetrating the inverted gourd-shaped air duct are evenly distributed on the circumferential surface of the inverted gourd-shaped air duct; among them, one end of the hollow cylinder I is hermetically connected to the inverted gourd-shaped outer cylinder, and the other end of the hollow cylinder I is hermetically connected to the inverted gourd-shaped inner cylinder;

[0103] The hollow cylinder I opened on the hollow bowl-shaped column section is oriented at an angle of 45° downward, that is, the blowing direction is inclined downward by 45°, the hollow cylinder I opened on the hollow column section is oriented in the horizontal direction, that is, the blowing direction is in the horizontal direction, and the hollow cylinder I opened on the hollow trumpet-shaped column section is oriented at an angle of 60° upward, that is, the blowing direction is inclined upward by 60°;

[0104] The pre-network heating device (i.e., the heating cylinder) is a hollow cylinder II, and there are 2 sealed hollow cylindrical interlayers between the inner wall and the outer wall of the hollow cylinder II, which are respectively denoted as the outer interlayer 4.6 and the inner interlayer 4.5;

[0105] The upper bottom surface of the outer interlayer 4.6 is provided with an outlet port IV 4.4, and the lower bottom surface is provided with an inlet port IV 4.3. The inlet port IV 4.3 and the outlet port IV 4.4 are respectively used to input and output heated diphenyl;

[0106] The upper bottom surface of the inner interlayer 4.5 is provided with an air outlet 4.2, and the lower bottom surface is provided with an air inlet 4.1. The air inlet 4.1 and the air outlet 4.2 are respectively used to input and output compressed air. An irregular mixing plate 4.7 is provided between the air outlet 4.2 and the air inlet 4.1. Compressed air is introduced into the air inlet 4.1, and after the compressed air is evenly heated by the mixing plate 4.7, it exits from the air outlet 4.2;

[0107] A hollow tube 4.8 is provided in the outer interlayer 4.6. One end of the hollow tube 4.8 is communicated with the air outlet 4.2, and the other end passes through the inner interlayer 4.5 and is communicated with the inside of the hollow cylinder II to form a nozzle II 4.10; a branch pipe is provided on the circumferential surface of the hollow tube 4.8. One end of the branch pipe is communicated with the hollow tube 4.8, and the other end passes through the inner interlayer 4.5 and is communicated with the inside of the hollow cylinder II to form a nozzle I 4.9;

[0108] The nozzle I 4.9 and the nozzle II 4.10 are circular holes, and the diameter ratio is 2:3;

[0109] The oiling device includes an oiling ring 12.1, an oiling wire guide I and an oiling wire guide II;

[0110] The upper oil ring 12.1 is a circular ring with a notch; the circular ring with a notch is a hollow structure; the outer diameter of the circular ring is 50 - 60 mm, and the inner diameter is 5 - 6 mm;

[0111] The upper oil ring 12.1 is provided with a rectifying plate 12.3 inside; the rectifying plate 12.3 is provided with evenly distributed rectifying holes 12.4, and the diameter of the rectifying holes is 1 - 1.2 mm; the rectifying plate 12.3 divides the interior of the upper oil ring 12.1 into a rectifying chamber 12.5 and a voltage stabilizing chamber 12.2 from the inside to the outside along the radial direction;

[0112] The inner wall of the upper oil ring 12.1 is evenly provided with upper oil holes 12.6, and the diameter of the upper oil holes 12.6 is 0.5 - 0.6 mm; the outer wall of the upper oil ring 12.1 is connected to the oil pipe I through a hollow connecting rod;

[0113] The upper oil wire guide I is a U-shaped ceramic part that is narrow at the top and wide at the bottom, the width of the narrowest part is 1 - 1.5 mm, the width of the widest part is 2 - 3 mm, and the bottom of the U-shaped ceramic part is provided with a through hole with a diameter of 0.7 - 1 mm. The through hole of the upper oil wire guide I is connected to the oil pipe II through a hollow connecting rod;

[0114] The shape of the upper oil wire guide II is the same as that of the upper oil wire guide I, and the through hole of the upper oil wire guide II is connected to the oil pipe III through a hollow connecting rod;

[0115] The upper oil ring 12.1 is arranged before the winding machine 13;

[0116] The upper oil wire guide I is arranged before the cooling device;

[0117] The upper oil wire guide II is arranged after the cooling device.

[0118] Specific usage process: Diphenyl is input into the outer sandwich layer 4.6 of the heating cylinder 4, the required compressed air enters from the air inlet 4.1, passes through the irregular mixing plate 4.7, and the compressed air is evenly heated in the inner sandwich layer 4.5 of the heating cylinder 4 and then exits from the air outlet 4.2, then enters the hollow tube 4.8, and is respectively sprayed from the nozzle I 4.9 and the nozzle II 4.10 towards the filament; a temperature tester is arranged between the air outlet 4.2 and the hollow tube 4.8, the flow rate of diphenyl is controlled by an electromagnetic valve, and a feedback circuit is formed between the diphenyl flow rate of the heating cylinder and the temperature tester for control. When the monitored temperature is lower than the set temperature, a signal is fed back to the electromagnetic valve to increase the opening degree, and vice versa to decrease the opening degree of the electromagnetic valve;

[0119] Cooling water with different flow rates is introduced into the slow cooling chamber 5.3, the flat cooling chamber 5.4, and the collective cooling chamber 5.5 in the inverted gourd-shaped air duct. The air blows towards the filament from the hollow cylinders I evenly distributed on the circumferential surface of the inverted gourd-shaped air duct. When the air passes through the inverted gourd-shaped air duct, the air temperature is different due to the influence of the cooling water temperature in each cooling chamber, and due to the influence of the structure of each section of the inverted gourd-shaped air duct, the direction and speed of the air blowing towards the filament are different, and the cooling is more uniform;

[0120] When oiling, after the filament passes through the combination of the oiling godet I 5.1 and the godet II 5.2, it is concentric and coaxial with the oiling ring 12.1 and is oiled by the sizing agent ejected from the oiling holes 12.6.

[0121] Example 1

[0122] A method for preparing a breathable and easily dyeable polyester profiled DTY uses the above-mentioned device for preparing a breathable and easily dyeable polyester profiled DTY. The specific selection of the preparation device is as follows: the outer diameter of the circular ring plate I is 40 mm; the inner diameter of the circular ring plate I is 30 mm; the distance a between the upper bottom plate and the circular ring plate I is 200 mm; the distance b between the circular ring plate I and the circular ring plate II is 300 mm; the distance c between the circular ring plate II and the lower bottom plate is 500 mm; the outer diameter of the circular ring is 50 mm and the inner diameter is 5 mm; the diameter of the rectifying hole is 1 mm; the diameter of the oiling hole is 0.5 mm; the width of the narrowest part of the U-shaped porcelain part is 1 mm, the width of the widest part is 2 mm, and a through hole with a diameter of 0.7 mm is provided at the bottom of the U-shaped porcelain part;

[0123] The specific preparation method is as Figure 1 shown. Using POY raw yarn (i.e., filament 1) as the raw material, a breathable and easily dyeable polyester profiled DTY is prepared by the DTY process. The DTY process flow includes: POY raw yarn → pre-network heating device (i.e., heating cylinder 4) heating → the first feeding roller 3 → pre-cooling → cooling by the cooling device 5 → pre-oiling → false twisting by the false twister 6 → the second feeding roller 7 → medium network 8 → auxiliary roller 9 → setting hot box 10 → setting overfeed 11 → oiling by the oiling device 12 → winding by the winder 13 to form a winding;

[0124] Among them, the specification of the POY raw yarn is 33 dtex / 72 f. As Figure 12 shown, the cross-section of the POY raw yarn is cross-shaped, the cross-shaped leaf length U1 is 0.115 mm, and the leaf width W1 is 0.018 mm; the device used for pre-cooling is the oiling godet I 5.1, and the sizing agent used by the oiling godet I 5.1 is a mixture of crude oil (brand: Zhejiang Transfar, specification TF-702L, concentration 100%) and water, and the concentration of crude oil in the sizing agent is 30%; the device used for pre-oiling is the oiling godet II 5.2, and the sizing agent used by the oiling godet II 5.2 is crude oil;

[0125] The process parameters are as follows: the temperature of diphenyl is 205°C; the pressure of pre-network 2 is 0.03 MPa; the temperature of cooling water is 20°C, and the cooling wind speed is 0.5 m / s; the flow rate of cooling water in the slow cooling chamber is 2 m / s, the flow rate of cooling water in the flat cooling chamber is 2.5 m / s, and the flow rate of cooling water in the collecting cooling chamber is 3 m / s; the false twist deformation uses polyurethane discs with a combination of 1-4-1, and the D / Y ratio is 1.57; the ratio of the speed of the second feeding roller to the speed of the first feeding roller is 1.53, and the processing speed of the second feeding roller is 500 m / min; the medium network air pressure is 0.12 MPa; the temperature of the setting hot box is 135°C, and the overfeed rate of the setting overfeed is -4.0%; the winding angle is 25°, and the forming cone angle is 65°; the oil agent used for the oiling ring is crude oil, and the oiling pressure of the oiling ring is 0.003 MPa; the oiling pressure of the oiling guide I is 0.001 MPa; the oiling pressure of the oiling guide II is 0.001 MPa.

[0126] The fineness of the finally prepared breathable and dyeable polyester profiled DTY is 22 dtex, the breaking elongation is 22.8%, the breaking strength is 4.1 cN / dtex, the oil content CV value is 3.5%, the profile degree is 50%, the dyeing M rate is 98.6%, the tension CV value is 0.93%, and the DTY appearance evaluation: less hairiness.

[0127] Comparative Example 1

[0128] A method for preparing polyester profiled DTY is basically the same as that in Example 1, except that cooling is carried out using the Figure 19 shown cooling plate (brand: Barmag; model A-C87-8605; specification 1100 mm; machine type Barmag FK6-1000).

[0129] The fineness of the prepared polyester profiled DTY is 22 dtex, the breaking elongation is 18.9%, the breaking strength is 3.7 cN / dtex, the oil content CV value is 3.5%, the profile degree is 35%, the dyeing M rate is 95.2%, and the tension CV value is 3.12%; the DTY appearance evaluation: more hairiness.

[0130] Comparing Comparative Example 1 with Example 1, it can be found that the CV value of the tension in Comparative Example 1 is relatively large, while the dyeing M rate, profile degree, breaking strength, and breaking elongation decrease. This is because the cooling plate in Comparative Example 1 cools by heat transfer, and the effect of cooling the profiled yarn is not good, which is not conducive to the transfer of twist during the false twisting process. The crimp structure is unstable, and the tension is unstable. Therefore, the CV value of the tension is relatively large. In Example 1, the inverted gourd-shaped cooling device adopts different cooling methods according to the molecular chain activity of the yarn at different stages, making the yarn cooler, more uniform, with a stable crimp structure and stable tension, and a small CV value of the tension. In addition, when the yarn contacts the cooling plate for cooling, the resistance increases during operation, and the yarn is damaged by the resistance, resulting in single-filament breakage, a decrease in breaking elongation and breaking strength, and an increase in hairiness. However, the inverted gourd-shaped cooling device in Example 1 does not contact the yarn, so the yarn will not be worn. Moreover, different cooling methods are adopted according to the molecular chain activity of the yarn at different stages, making the yarn cooler and more uniform. Therefore, there are fewer single-filament breaks, less hairiness, and higher breaking elongation and breaking strength. The profiled yarn has a profiled cross-section and a large specific surface area. In Comparative Example 1, the contact cooling between the yarn and the cooling plate is prone to uneven cooling, and the crimp structure formed by the yarn during the false twisting process is uneven, resulting in uneven dyeing, such as shades and streaky filaments, so the dyeing M rate is low. In Example 1, the inverted gourd-shaped cooling device adopts different cooling methods according to the molecular chain activity of the yarn at different stages, making the yarn cooler and more uniform, with a stable crimp structure, stable tension, uniform dyeing, and a high dyeing M rate.

[0131] Example 2

[0132] A method for preparing a breathable and easily dyeable polyester profiled DTY uses the above-mentioned device for preparing a breathable and easily dyeable polyester profiled DTY. The specific selection of the preparation device is as follows: the outer diameter of the circular ring plate I is 42 mm; the inner diameter of the circular ring plate I is 32 mm; the distance a between the upper bottom plate and the circular ring plate I is 220 mm; the distance b between the circular ring plate I and the circular ring plate II is 320 mm; the distance c between the circular ring plate II and the lower bottom plate is 520 mm; the outer diameter of the circular ring is 52 mm, and the inner diameter is 5 mm; the diameter of the rectifying hole is 1.1 mm; the diameter of the oiling hole is 0.5 mm; the width of the narrowest part of the U-shaped porcelain part is 1 mm, and the width of the widest part is 2 mm. There is a through hole with a diameter of 0.7 mm at the bottom of the U-shaped porcelain part.

[0133] The specific preparation method is as follows: Using POY raw yarn as the raw material, a breathable and easily dyeable polyester profiled DTY is prepared by the DTY process. The DTY process flow includes: POY raw yarn → pre-network heating device heating → first feeding roller → pre-cooling → cooling device cooling → pre-oiling → false twisting → second feeding roller → medium network → auxiliary roller → shaping hot box → shaping overfeed → oiling ring spraying oil → winding machine winding and forming.

[0134] Among them, the specification of the POY raw yarn is 53 dtex / 144 f, as Figure 13 shown, the cross-section is I-shaped, the upper leaf length U2 of the I-shape is 0.02 mm, the lower leaf length U2.1 is 0.03 mm, the leaf width W2 is 0.01 mm, and the leaf height V2 is 0.67 mm; the device used for pre-cooling is the oiling godet I, and the oil agent used by the oiling godet I is a mixture of crude oil (brand: Zhejiang Chuanhua, specification TF-702L, concentration 100%) and water, and the concentration of crude oil in the oil agent is 32%; the device used for pre-oiling is the oiling godet II, and the oil agent used by the oiling godet II is crude oil;

[0135] The process parameters are as follows: the diphenyl temperature is 210 °C; the pre-network pressure is 0.032 MPa; the temperature of the cooling water is 19 °C, and the cooling wind speed is 0.3 m / s; the flow rate of the cooling water in the slow cooling chamber is 2.1 m / s, the flow rate of the cooling water in the flat cooling chamber is 2.6 m / s, and the flow rate of the cooling water in the collecting cooling chamber is 3.1 m / s; the polyurethane discs with a combination of 1-4-1 are used for false twist texturing, and the D / Y ratio is 1.56; the ratio of the speed of the second feeding roller to the speed of the first feeding roller is 1.55, and the processing speed of the second feeding roller is 500 m / min; the medium-network air pressure is 0.14 MPa; the temperature of the setting hot box is 140 °C; the overfeed rate of the setting overfeed is -4.2%; the winding angle is 25°, and the forming cone angle is 65°; the oil agent used by the oiling ring is crude oil, and the oiling pressure of the oiling ring is 0.0032 MPa; the oiling pressure of the oiling godet I is 0.0012 MPa; the oiling pressure of the oiling godet II is 0.0012 MPa.

[0136] The finally obtained breathable and easily dyeable polyester profiled DTY has a fineness of 33 dtex, an elongation at break of 22.3%, a breaking strength of 4.08 cN / dtex, an oil content CV value of 3.0%, a profile degree of 50%, a dyeing M rate of 98.9%, a DTY tension CV value of 1.06%, and the DTY appearance evaluation: few hairiness.

[0137] Comparative Example 2

[0138] A preparation method of polyester profiled DTY is basically the same as that of Example 2, the difference is that the cooling is carried out by using the ring blowing cooling device of the patent CN112708976B as Figures 17 to 18 shown.

[0139] The obtained polyester profiled DTY has a tension CV value of 3.08%; the DTY appearance evaluation: many hairiness.

[0140] By comparing Comparative Example 2 with Example 2, it can be found that the CV value of the tension in Comparative Example 2 is relatively large. This is because in Comparative Example 2, the cooling air is used to cool the entire filament in the annular blowing cooling device. Since the cooling device is vertically installed on the texturing machine and the cooling device is relatively long, there will be a large cooling deviation between different sections of the filament due to the long cooling distance. This is mainly because the cooling air attenuates after rectification, resulting in a lower cooling air speed at the upper end of the air duct than at the lower end, and there is a large cooling deviation between different sections, leading to an unstable crimp structure and unstable tension. Therefore, the CV value of the tension is relatively large. In contrast, the inverted gourd-shaped cooling device in Example 2 adopts different cooling methods according to the molecular chain activity of the filament at different stages, making the filament cooling more sufficient and uniform, with a stable crimp structure, stable tension, and a small CV value of the tension.

[0141] Example 3

[0142] A method for preparing a polyester profiled DTY is basically the same as that in Example 2, except that the contact heating of the texturing hot box of the prior art (i.e., Patent CN112708976B) is adopted.

[0143] The obtained polyester profiled DTY has an elongation at break of 20.3%, a breaking strength of 3.94 cN / dtex, an oil content CV value of 3.0%, a profile degree of 50%, a dyeing M rate of 97.2%, a DTY tension CV value of 1.06%, and the appearance evaluation of the DTY: there are many hairinesses.

[0144] By comparing Example 3 with Example 2, it can be found that the dyeing M rate, breaking strength, and elongation at break in Example 3 have decreased. This is because the filament in Example 3 is in contact with the texturing hot box for heating, resulting in an increase in resistance during operation. After being affected by the resistance, the filament is damaged, leading to single filament breakage, a decrease in elongation at break and breaking strength, and an increase in hairiness. The cross-section of the profiled filament is profiled and has a large specific surface area. When the filament is in contact with the hot box for heating, it is easy to have uneven heating, resulting in stiff filaments, different shades of color difference, etc., leading to a low dyeing M rate.

[0145] Example 4

[0146] A method for preparing a breathable and easily dyeable polyester profiled DTY uses a breathable and easily dyeable polyester profiled DTY preparation device as described above. Specifically, the preparation device is selected as follows: the outer diameter of the circular ring plate I is 45 mm; the inner diameter of the circular ring plate I is 35 mm; the distance a between the upper bottom plate and the circular ring plate I is 250 mm; the distance b between the circular ring plate I and the circular ring plate II is 350 mm; the distance c between the circular ring plate II and the lower bottom plate is 550 mm; the outer diameter of the circular ring is 55 mm and the inner diameter is 5.5 mm; the diameter of the rectifying hole is 1.2 mm; the diameter of the oiling hole is 0.55 mm; the width of the narrowest part of the U-shaped porcelain part is 1.2 mm, the width of the widest part is 2.5 mm, and a through hole with a diameter of 0.85 mm is provided at the bottom of the U-shaped porcelain part;

[0147] The specific preparation method is as follows: Using POY raw yarn as raw material, breathable and dyeable polyester profiled DTY is prepared by DTY process; The DTY process flow includes: POY raw yarn → pre-network heating device heating → first feeding roller → pre-cooling → cooling device cooling → pre-oiling → false twist deformation → second feeding roller → middle network → auxiliary roller → setting hot box → setting overfeed → oiling ring spraying oil → winding machine winding and forming;

[0148] Among them, the specification of the POY raw yarn is 85 dtex / 144 f. As Figure 14 shown, the cross-section of the POY raw yarn is trilobal, the included angle α3 between the three lobes of the trilobal is 120°, the lobe length U3 is 0.2 mm, and the lobe width W3 is 0.048 mm; The device used for pre-cooling is oiling guide I, and the oil agent used by the oiling guide I is a mixture of crude oil (brand: Zhejiang Transfar, specification TF-702L, concentration 100%) and water, and the concentration of crude oil in the oil agent is 35%; The device used for pre-oiling is oiling guide II, and the oil agent used by the oiling guide II is crude oil;

[0149] The process parameters are as follows: The temperature of diphenyl is 220 °C; The pre-network pressure is 0.035 MPa; The temperature of the cooling water is 22 °C, and the cooling wind speed is 0.4 m / s; The flow rate of the cooling water in the slow cooling chamber is 2.3 m / s, the flow rate of the cooling water in the flat cooling chamber is 2.8 m / s, and the flow rate of the cooling water in the collecting cooling chamber is 3.2 m / s; The false twist deformation uses a polyurethane disc with a combination of 1-4-1, and the D / Y ratio is 1.53; The ratio of the speed of the second feeding roller to the feeding speed of the first roller is 1.58, and the processing speed of the second feeding roller is 550 m / min; The middle network air pressure is 0.15 MPa; The temperature of the setting hot box is 140 °C, and the overfeed rate of the setting overfeed is -5.3%; The winding angle is 27°, and the forming cone angle is 67°; The oil agent used by the oiling ring is crude oil, and the oiling pressure of the oiling ring is 0.0035 MPa; The oiling pressure of the oiling guide I is 0.0015 MPa; The oiling pressure of the oiling guide II is 0.0015 MPa.

[0150] The finally obtained breathable and dyeable polyester profiled DTY has a fineness of 55 dtex, an elongation at break of 21.9%, a breaking strength of 4.1 cN / dtex, an oil content CV value of 5.5%, a profile degree of 48%, a dyeing M rate of 99.1%, a DTY tension CV value of 0.88%, and the DTY appearance evaluation: few hairiness.

[0151] Example 5

[0152] A preparation method of polyester profiled DTY is basically the same as that of Example 4, the difference is that the oiling device of the prior art (Patent CN112708976B) is used for oiling.

[0153] The elongation at break of the obtained polyester shaped DTY is 21.7%, the breaking strength is 3.88cN / dtex, the oil content CV value is 10.2%, the shaped degree is 48%, the dyeing M rate is 99.1%, the DTY tension CV value is 1.07%, and the DTY appearance evaluation: there are many hairs.

[0154] Comparing Example 5 with Example 4, it can be found that the tension CV value of Example 5 is larger, there are more hairy fibers, and the breaking strength is reduced. This is because the shaped yarn has poor adsorption of oil, and the oil splashing and uneven oiling are prone to occur during oiling. The yarns are easy to diverge, and the bundling performance of the yarns is slightly reduced, resulting in a larger fluctuation in the winding tension than that of Example 4. Therefore, compared with Example 4, the yarn tension CV value is larger, there are more hairy fibers, and the breaking strength is reduced.

[0155] Example 6

[0156] A method for preparing breathable and easy-to-dye polyester special-shaped DTY, using the above-mentioned breathable and easy-to-dye polyester special-shaped DTY preparation device, the preparation device is specifically selected as follows: the outer diameter of the circular plate I is 50mm; the inner diameter of the circular plate I is 40mm; the distance a between the upper bottom plate and the circular plate I is 300mm; the distance b between the circular plate I and the circular plate II is 400mm; the distance c between the circular plate II and the lower bottom plate is 600mm; the outer diameter of the ring is 60mm, and the inner diameter is 6mm; the diameter of the rectifying hole is 1.2mm; the diameter of the oiling hole is 0.6mm; the width of the narrowest part of the U-shaped porcelain piece is 1.5mm, the width of the widest part is 3mm, and the bottom of the U-shaped porcelain piece is provided with a through hole with a diameter of 1mm;

[0157] The specific preparation method is: using POY raw yarn as raw material, adopting DTY process to prepare breathable and easy-to-dye polyester special-shaped DTY; the DTY process includes: POY raw yarn → heating by pre-interlacing heating device → first feeding roller → pre-cooling → cooling by cooling device → pre-oiling → false twisting → second feeding roller → middle interlacing → auxiliary roller → shaping hot box → shaping overfeeding → oiling by oiling ring spraying → winding and forming by winding machine;

[0158] Among them, the specification of POY raw yarn is 130dtex / 192f, such as Figure 15 As shown, the cross section of the POY raw yarn is five-leaf shaped, the angle α4 between the leaves is 72°, the leaf width W4 is 0.032mm, and the leaf length U4 is 0.16mm; the device used for pre-cooling is the oiling guide I, and the oil used by the oiling guide I is a mixture of crude oil (brand: Zhejiang Chuanhua, specification TF-702L, concentration is 100%) and water, and the crude oil concentration in the oil is 40%; the device used for pre-oiling is the oiling guide II, and the oil used by the oiling guide II is crude oil;

[0159] The process parameters are as follows: the temperature of diphenyl is 210°C; the pre-network pressure is 0.03 MPa; the temperature of cooling water is 20°C, and the cooling wind speed is 0.5 m / s; the flow rate of cooling water in the slow cooling chamber 5.3 is 2.5 m / s, the flow rate of cooling water in the flat cooling chamber 5.4 is 3 m / s, and the flow rate of cooling water in the collecting cooling chamber 5.5 is 3.5 m / s; the false twist deformation uses polyurethane discs with a combination of 1-4-1, and the D / Y ratio is 1.54; the ratio of the speed of the second feeding roller to the speed of the first feeding roller is 1.58, and the processing speed of the second feeding roller is 580 m / min; the medium-network air pressure is 0.16 MPa; the overfeed rate of the setting overfeed is -5.6%; the winding angle is 28°, and the forming cone angle is 70°; the oil agent used for the oiling ring is crude oil, and the oiling pressure of the oiling ring is 0.004 MPa; the oiling pressure of the oiling guide I is 0.002 MPa; the oiling pressure of the oiling guide II is 0.002 MPa.

[0160] The fineness of the finally obtained breathable and easily dyeable polyester profiled DTY is 83 dtex, the elongation at break is 21.4%, the breaking strength is 4.15 cN / dtex, the oil content CV value is 4.5%, the profile degree is 48%, the dyeing M rate is 99.3%, the DTY tension CV value is 0.91%, and the DTY appearance evaluation: less hairiness.

Claims

1. A breathable and easy-to-dye polyester special-shaped DTY preparation device, characterized in that: It includes a cooling device, which is an inverted gourd-shaped air duct; The inverted gourd shape is composed of a hollow bowl-shaped column segment, a hollow cylindrical segment and a hollow trumpet-shaped column segment connected in sequence from top to bottom; The hollow bowl-shaped column segment is obtained by rotating the generatrix I around the axis for one circle, the generatrix I is an arc segment, and the convex direction of the arc segment is away from the central axis; The hollow cylindrical segment is obtained by rotating the generatrix II around the axis for one circle, and the generatrix II is a straight line segment; The hollow trumpet-shaped column section is obtained by rotating the generatrix III around the axis for one circle, the generatrix III is an arc segment, and the convex direction of the arc segment faces the central axis; The upper base of the hollow bowl-shaped column section is larger than the cross section of the hollow cylindrical section, and the lower base of the hollow trumpet-shaped column section is smaller than the cross section of the hollow cylindrical section; The inverted gourd-shaped air cylinder comprises an inverted gourd-shaped outer cylinder and an inverted gourd-shaped inner cylinder, a cavity is formed between the inverted gourd-shaped outer cylinder and the inverted gourd-shaped inner cylinder, and is closed by an upper bottom plate and a lower bottom plate; The cavity is divided into three sections by the circular plate I and the circular plate II; the hollow bowl-shaped column section of the inverted gourd-shaped outer cylinder, the hollow bowl-shaped column section of the inverted gourd-shaped inner cylinder, the upper bottom plate and the upper surface of the circular plate I form a slow cooling chamber (5.3); the hollow cylindrical section of the inverted gourd-shaped outer cylinder, the hollow cylindrical section of the inverted gourd-shaped inner cylinder, the lower surface of the circular plate I and the upper surface of the circular plate II form a flat cooling chamber (5.4); the hollow trumpet-shaped column section of the inverted gourd-shaped outer cylinder, the hollow trumpet-shaped column section of the inverted gourd-shaped inner cylinder, the lower surface of the circular plate II and the lower bottom plate form a cold collecting chamber (5.5); The inverted gourd-shaped outer cylinder is provided with an inlet I (5.31), an inlet II (5.41), an inlet III (5.51), an outlet I (5.32), an outlet II (5.42) and an outlet III (5.52); The inlet I (5.31) and the outlet I (5.32) are used to input and output cooling water into and out of the slow cooling chamber (5.3), respectively; The inlet II (5.41) and the outlet II (5.42) are used to input and output cooling water into and out of the flat cooling chamber (5.4), respectively; The inlet III (5.51) and the outlet III (5.52) are used to input and output cooling water into and out of the cold collecting chamber (5.5), respectively; A plurality of hollow cylinders I penetrating the inverted gourd-shaped air duct are evenly distributed on the circumference of the inverted gourd-shaped air duct; one end of the hollow cylinder I is sealedly connected to the inverted gourd-shaped outer cylinder, and the other end of the hollow cylinder I is sealedly connected to the inverted gourd-shaped inner cylinder; The hollow cylinder I opened on the hollow bowl-shaped column section is oriented to be inclined downward, the hollow cylinder I opened on the hollow cylindrical section is oriented to be horizontal, and the hollow cylinder I opened on the hollow trumpet-shaped column section is oriented to be inclined upward.

2. The device for preparing breathable and easy-to-dye polyester special-shaped DTY according to claim 1, characterized in that: The upper bottom plate and the lower bottom plate are both circular ring plates; the ratio of the outer diameter of the upper bottom plate to the circular ring plate I is 3:2; the outer diameters of the circular ring plate I and the circular ring plate II are the same; the ratio of the outer diameters of the circular ring plate II and the lower bottom plate is 2:1; the ratio of the inner diameter of the upper bottom plate to the circular ring plate I is 5:3; the inner diameters of the circular ring plate I and the circular ring plate II are the same; the ratio of the inner diameter of the circular ring plate II and the lower bottom plate is 3:

1.

3. The device for preparing breathable and easy-to-dye polyester special-shaped DTY according to claim 2, characterized in that: The outer diameter of the circular plate I is 40~50mm; the inner diameter of the circular plate I is 30~40mm; the distance between the upper base plate and the circular plate I is 200~300mm; the distance between the circular plate I and the circular plate II is 300~400mm; the distance between the circular plate II and the lower base plate is 500~600mm.

4. The device for preparing breathable and easy-to-dye polyester special-shaped DTY according to claim 3, characterized in that: Also includes a pre-network heating device; The pre-network heating device is a hollow cylinder II, and the inner wall and outer wall of the hollow cylinder II contain two sealed hollow cylindrical interlayers, which are respectively recorded as the outer interlayer (4.6) and the inner interlayer (4.5); The upper bottom surface of the outer interlayer (4.6) is provided with an outlet port IV (4.4), and the lower bottom surface is provided with an inlet port IV (4.3), and the inlet port IV (4.3) and the outlet port IV (4.4) are used for inputting and outputting heated biphenyl respectively; An air outlet (4.2) is provided on the upper bottom surface of the inner interlayer (4.5), and an air inlet (4.1) is provided on the lower bottom surface. The air inlet (4.1) and the air outlet (4.2) are used to input and output compressed air, respectively. A mixing plate (4.7) is provided between the air outlet (4.2) and the air inlet (4.1). A hollow tube (4.8) is provided in the outer interlayer (4.6), one end of the hollow tube (4.8) is connected to the air outlet (4.2), and the other end passes through the inner interlayer (4.5) to communicate with the interior of the hollow cylinder II, thereby forming a nozzle II (4.10); a branch tube is provided on the circumference of the hollow tube (4.8), one end of the branch tube is connected to the hollow tube (4.8), and the other end passes through the inner interlayer (4.5) to communicate with the interior of the hollow cylinder II, thereby forming a nozzle I (4.9); Nozzle I (4.9) and nozzle II (4.10) are circular holes with a diameter ratio of 2:

3.

5. The device for preparing breathable and easy-to-dye polyester special-shaped DTY according to claim 4, characterized in that: It also includes an oiling device, an oil pipe I, an oil pipe II and an oil pipe III; the oiling device includes an oiling ring (12.1), an oiling wire guide I and an oiling wire guide II; The oiling ring (12.1) is a circular ring with a notch; the circular ring with a notch is a hollow structure; the outer diameter of the circular ring is 50~60mm, and the inner diameter is 5~6mm; A rectifying plate (12.3) is provided inside the upper oil ring (12.1); a uniform rectifying hole (12.4) is provided on the rectifying plate (12.3); the diameter of the rectifying hole is 1 to 1.2 mm; the rectifying plate divides the interior of the upper oil ring into a rectifying chamber (12.5) and a stabilizing chamber (12.2) from inside to outside along the radial direction; The inner wall of the upper oil ring is evenly provided with oil holes (12.6), and the diameter of the upper oil holes (12.6) is 0.5-0.6 mm; the outer wall of the upper oil ring is connected to the oil pipe I through a hollow connecting rod; The oiling wire guide I is a U-shaped porcelain piece that is narrow at the top and wide at the bottom. A through hole with a diameter of 0.7-1 mm is provided at the bottom of the U-shaped porcelain piece. The through hole of the oiling wire guide I is connected to the oil pipe II through a hollow connecting rod. The shape of the oiling wire guide II is the same as that of the oiling wire guide I, and the through hole of the oiling wire guide II is connected to the oil pipe III through a hollow connecting rod; The oiling ring (12.1) is arranged before the winding machine; The oiling wire guide I is arranged before the cooling device; The oiling wire guide II is arranged after the cooling device.

6. A method for preparing breathable and easy-to-dye polyester special-shaped DTY, characterized in that: The breathable and easy-to-dye polyester special-shaped DTY preparation device according to claim 5 is adopted; POY raw yarn is used as raw material, and the breathable and easy-to-dye polyester special-shaped DTY is prepared by the DTY process; the DTY process comprises: POY raw yarn → heating by a pre-intertwining heating device → first feeding roller → pre-cooling → cooling by a cooling device → pre-oiling → false twisting → second feeding roller → middle intertwining → auxiliary roller → shaping hot box → shaping overfeeding → oiling by oiling ring spraying → winding and forming by a winding machine; The device used for precooling is an oiling wire guide I, and the oil used by the oiling wire guide I is a mixture of crude oil and water, and the crude oil concentration in the oil is 30-40%; The device used for pre-oiling is an oiling yarn guide II, and the oil used by the oiling yarn guide II is crude oil.

7. The method for preparing a breathable and easy-to-dye polyester special-shaped DTY according to claim 6, characterized in that: The cross-section of POY precursor is trilobal, cross-shaped, pentlobal and I-shaped.

8. The method for preparing a breathable and easy-to-dye polyester special-shaped DTY according to claim 7, characterized in that: The process parameters include: biphenyl temperature is 200~250℃; pre-network pressure is 0.03~0.04 MPa; cooling water temperature is 18~22℃, cooling wind speed is 0.3~0.5m / s; cooling water flow rate in slow cooling chamber (5.3) is 2~2.5m / s, cooling water flow rate in flat cooling chamber (5.4) is 2.5~3m / s, cooling water flow rate in cooling chamber (5.5) is 3~3.5m / s; false twist texturing uses polyurethane discs with a combination of 1-4-1, D / Y ratio is 1.4~1.6; second feeding The ratio of the roller speed to the wire feeding speed of the first roller is 1.53~1.58, and the processing speed of the second wire feeding roller is 500~600 m / min; the middle network air pressure is 0.07~0.18 MPa; the overfeed rate of the shaping overfeed is -3.0~-6.0%; the winding angle is 25°~28°, and the forming cone angle is 65°~70°; the oil agent used for the oiling ring is crude oil, and the oiling pressure of the oiling ring is 0.003~0.004 MPa; the oiling pressure of the oiling wire guide I is 0.001~0.002 MPa; the oiling pressure of the oiling wire guide II is 0.001~0.002 MPa.

9. The method for preparing a breathable and easy-to-dye polyester special-shaped DTY according to claim 8, characterized in that: The monofilament fineness of breathable and easy-to-dye polyester special-shaped DTY is ≤0.55dtex, the elongation at break is 20.5~23%, the breaking strength is 3.95~4.15cN / dtex, the oil content CV value is 3.0~5.5%, the special-shaped degree is 45~50%, the dyeing M rate is 98~99.5%, and the tension CV value is 0.88~1.07%.

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