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 invention belongs to the technical field of fibers, and relates to a device and a method for preparing breathable and easy-to-dye polyester special-shaped DTY. Background Art

[0002] With the improvement of living standards and people's yearning for a better life, the requirements for comfort and functionality of clothes are also increasing. The elasticity, breathability and functionality of fabrics processed from conventional polyester varieties are limited. Due to its unique characteristics, polyester fine-denier porous shaped yarn has a special cross-section, a large specific surface area, good moisture absorption and perspiration performance, and the woven cloth is very soft and breathable. The fabric is light and thin, and it is very comfortable to wear. However, due to the special cross-section of the shaped fiber, strong cooling and fast cooling keep its special degree at a high level, but it will cause the outer single filament of the silk strip to cool excessively, and the outer single filament will break during stretching; reducing the cooling temperature and wind speed, the temperature difference between the inside and outside of the silk strip is reduced, and the cooling is more uniform, but the specific surface area of ​​the shaped silk is large, the friction resistance with the air is large, and the wind speed is reduced. Under the action of the tensile force, the special cross section will tend to form a circular cross section, and the stretching process will cause the silk strip to have poor special degree. Therefore, in the prior art, the shaped yarn cannot maintain a high degree of shape while keeping the temperature difference between the inside and outside of the yarn small during the cooling process, so the dyeing rate of the shaped yarn and the mechanical properties (elongation at break and breaking strength) of the yarn cannot be taken into account at the same time.

[0003] Patent CN112708976B adopts a ring-blowing cooling process to cool the silk strips from all sides at the same time. The cooling effect can be controlled by the temperature and wind speed of the ring-blowing air to achieve the best cooling effect and uniform cooling. Compared with the cooling plate, the cooling effect can be improved by more than 10%, thereby ensuring the degree of irregularity of the silk strips during the stretching process, improving the dyeing rate of the fiber, and the product produced by this method has good mechanical properties. However, the ring-blowing air cooling is to cool the entire silk strip, and because the cooling device is vertically installed on the texturing machine and the cooling device is relatively long, the cooling wind is attenuated after rectification, resulting in the cooling wind speed at the upper end of the wind tube being less than that at the lower end of the wind tube, which will cause a large cooling deviation between the sections of the silk strip due to the long cooling distance, resulting in an unstable curling 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 easy-to-dye polyester special-shaped 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 to provide a device and method for preparing breathable and easy-to-dye polyester special-shaped DTY.

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

[0007] A device for preparing breathable and easy-to-dye polyester special-shaped DTY, comprising a cooling device, wherein the cooling device is an inverted gourd-shaped air duct;

[0008] 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;

[0009] 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;

[0010] 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;

[0011] The hollow trumpet-shaped column segment 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 is toward the central axis; the upper base of the hollow bowl-shaped column segment is larger than the cross section of the hollow cylindrical segment, and the lower base of the hollow trumpet-shaped column segment is smaller than the cross section of the hollow cylindrical segment;

[0012] 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;

[0013] 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; 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; 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;

[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 used to input and output cooling water into and out of the slow cooling chamber respectively;

[0016] Inlet II and outlet II are used to input and output cooling water into and out of the flat cooling chamber respectively;

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

[0018] A plurality of hollow cylinders I (i.e., cooling air holes) penetrating the inverted gourd-shaped wind tube are evenly distributed on the circumference of the inverted gourd-shaped wind tube; one end of the hollow cylinder I is sealedly connected to the inverted gourd-shaped outer tube, and the other end of the hollow cylinder I is sealedly connected to the inverted gourd-shaped inner tube;

[0019] The hollow cylinder I disposed on the hollow bowl-shaped column section is oriented to be tilted downward, preferably the blowing direction is tilted downward by 45°, the hollow cylinder I disposed on the hollow cylindrical section is oriented to be horizontal, that is, the blowing direction is horizontal, and the hollow cylinder I disposed on the hollow trumpet-shaped column section is oriented to be tilted upward, preferably the blowing direction is tilted upward by 60°;

[0020] The annular air cooling of the prior art uses cooling air in the cooling device to cool the entire silk strip. However, since the cooling device is installed vertically on the texturing machine and is relatively long, the cooling deviation between the sections of the silk strip will be large due to the long cooling distance. This is mainly because the cooling air is attenuated after rectification, resulting in the cooling wind speed at the upper end of the wind tube being smaller than that at the lower end of the wind tube. The cooling device of the present invention is a segmented wind tube, which mainly controls the cooling temperature by the flow rate of cooling water. When the air supply speed remains unchanged, the water flow rate of each section is adjusted to control the air blowing cooling temperature, so that each section and each point on the cooling air axis is kept at a small temperature difference to cool the silk strip. Therefore, the problem of large cooling deviation between sections in the prior art will not exist, so that the silk strip curling structure is stable and the tension is stable.

[0021] The design of the inverted gourd-shaped cooling cylinder increases the wind pressure of the cooling air in the axial direction of the cooling cylinder from top to bottom, and at the same time, the cooling temperature of the wire when passing through each cooling chamber is gradually reduced by adjusting the cooling water flow in each chamber; when the molecular chain of the wire is active, the upper section of the inverted gourd-shaped wind cylinder (the part above the circular plate I) prevents excessive cooling air pressure or too low initial cooling temperature from causing a large temperature difference between the surface and the inner layer of the wire, deterioration of tensile properties, and the problem of hairy wire; in the middle section of the inverted gourd-shaped wind cylinder (the part between the circular plate I and the circular plate II), the wire is blown horizontally to improve the cooling efficiency and prevent insufficient cooling from causing a large decrease in the degree of irregularity; in the lower section of the inverted gourd-shaped wind cylinder (the part below the circular plate II), the cooling air is collected in the cold collection chamber. At this time, the activity of the macromolecules inside the wire has been greatly reduced, and sufficient cooling is given to ensure that the degree of irregularity of the wire remains at a high level.

[0022] In the gourd-shaped design of the present invention, the generatrix of the hollow bowl-shaped column segment and the hollow trumpet-shaped column segment is an arc segment, and the convex directions of the arc segment are opposite. This is mainly because after the wire strip is heated, when it enters the cooling duct for cooling, 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 rapid cooling will cause uneven cooling inside and outside the wire, increase the tensile stress, and increase the number of broken 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 with 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, the wind pressure is increased, and 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 special shape of the wire. In this stage, the wire is directly cooled by laminar cooling after rectification, the wind pressure is increased, and the wind temperature is reduced, so that it is quickly cooled to near the glass transition temperature to prevent the special shape from decreasing too much under the action of stretching.

[0025] Third, at the end of cooling, the crystallization inside the filament tends to be stable, the temperature of the filament is stable at the glass transition temperature, and 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 filament are fully and evenly cooled, which not only further ensures the shape of the filament, but also prevents uneven dyeing caused by uneven crystallization in the later stage; this section of cooling wind is inclined upward, which can prevent the wind from the upper and middle sections from being discharged too quickly, and the cooling wind from the upper, middle and lower sections is gathered in the cold collection chamber. At this time, the activity of the macromolecules inside the filament has been greatly reduced, and a large amount of cooling wind can give the filament sufficient cooling to ensure that the shape of the filament remains at a high level.

[0026] The reason why the upper and lower sections of the inverted gourd shape of the present invention are designed in arcs instead of straight lines is that in a straight line design, there are protrusions or corners at the junction of each section. When the wind flows along the inner wall, local turbulence will be generated due to the protrusions (the upper section and the middle section form a protruding acute angle) or corners (the middle section and the lower section), affecting the uniformity of the overall wind speed and causing uneven heating of the silk strips.

[0027] As the preferred technical solution:

[0028] In the above-mentioned breathable and easy-to-dye polyester special-shaped DTY preparation device, 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 diameters of the upper bottom plate and 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; and the ratio of the inner diameters of the circular ring plate II and the lower bottom plate is 3:1.

[0029] In the above-mentioned breathable and easy-to-dye polyester special-shaped DTY preparation device, the outer diameter of the circular plate I is 40-50 mm; the inner diameter of the circular plate I is 30-40 mm; the spacing between the upper bottom plate and the circular plate I is 200-300 mm; the spacing between the circular plate I and the circular plate II is 300-400 mm; the spacing between the circular plate II and the lower bottom plate is 500-600 mm.

[0030] The above-mentioned breathable and easy-to-dye polyester special-shaped DTY preparation device also includes a pre-network heating device;

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

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

[0033] An air outlet is provided on the upper bottom surface of the inner interlayer, and an air inlet is provided on the lower bottom surface. The air inlet and the air outlet are used to input and output compressed air respectively. An irregular mixing plate is provided between the air outlet and the air inlet. Compressed air is introduced into the air inlet, and after being evenly heated by the mixing plate, the compressed air is discharged from the air outlet.

[0034] A hollow tube is provided in the outer interlayer, one end of the hollow tube is connected to the air outlet, and the other end passes through the inner interlayer to communicate with the inside of the hollow cylinder II, thereby forming a nozzle II; a branch tube is provided on the circumference of the hollow tube, one end of the branch tube is connected to the hollow tube, and the other end passes through the inner interlayer to communicate with the inside of the hollow cylinder II, thereby forming a nozzle I;

[0035] Nozzle I and nozzle II are circular holes with a diameter ratio of 2:3;

[0036] Double nozzles are set in the heating cylinder, and the external compressed air is evenly heated from the inner interlayer of the heating cylinder and then enters the pipe of the outer interlayer of the heating cylinder, and is ejected from the nozzles respectively to blow the multifilament apart, so that the hot air evenly heats the single filament. By setting a reasonable pressure, such as 0.002~0.003MPa, the filaments can be blown apart but no network points are formed. At the lower end, due to the large nozzle aperture, the flow rate formed by the compressed air is further reduced, which can protect the stability of the heated filament structure; in addition, the inner interlayer of the heating cylinder still maintains the heating effect on the filaments that have passed through the pre-network heating device;

[0037] Such a design can eliminate the problem in the prior art that when heating multifilaments (especially shaped yarns), the outer part of the yarn is heated at a higher temperature than the inner part of the yarn, the yarn is heated unevenly, and the dyeing M rate of the shaped yarn is low;

[0038] Furthermore, a temperature tester is arranged between the air outlet and the hollow tube, and the flow rate of biphenyl is controlled by a solenoid valve, so that the biphenyl flow rate of the heating tube and the temperature tester form a feedback circuit control. When the monitored temperature is lower than the set temperature, a signal is generated and fed back to the solenoid valve to increase the opening, otherwise the opening of the solenoid valve is reduced.

[0039] The above-mentioned breathable and easy-to-dye polyester special-shaped DTY preparation device 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, an oiling wire guide I and an oiling wire guide 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 50~60mm, and the inner diameter is 5~6mm;

[0041] A rectifier plate is provided inside the upper oil ring; the rectifier plate is provided with uniform rectifier holes, and the diameter of the rectifier holes is 1~1.2mm; the rectifier plate divides the interior of the upper oil ring into a rectifier chamber and a pressure stabilizing chamber from inside to outside along the radial direction;

[0042] The inner wall of the upper oil ring is evenly provided with oil holes, and the diameter of the upper oil holes 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;

[0043] Since there are multiple oiling holes on the upper oil ring, the rectifier plate is required to form an "obstruction" so that the oil agent can first fill the pressure stabilizing chamber. In this way, the oil pressure at each point of the rectifier plate is the same, and the oil pressure of the oil agent flowing from the pressure stabilizing chamber through the rectifier plate into the rectifier chamber is uniform. The function of the rectifier chamber is basically the same as that of the pressure stabilizing chamber. The oil agent is further mixed and pressure-equalized in the rectifier chamber, and the pressure when it is squeezed out from the upper oil hole will also be uniform, achieving the purpose of uniform oiling. The design of the oil ring is non-contact oiling to reduce friction.

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

[0045] 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;

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

[0047] The oiling wire guide I is arranged before the cooling device and is used to pre-cool the wire bundle by using an oil agent;

[0048] The oiling yarn guide II is arranged after the cooling device and is used for pre-oiling the yarn bundle with an oil agent.

[0049] The present invention also provides a method for preparing breathable and easy-to-dye polyester special-shaped DTY, which adopts the breathable and easy-to-dye polyester special-shaped DTY preparation device as described above; POY raw yarn is used as raw material, and the breathable and easy-to-dye polyester special-shaped DTY is prepared by DTY process; the DTY process comprises: POY raw yarn→heating by pre-intertwining heating device→first feeding roller→pre-cooling→cooling by cooling device→pre-oiling→false twisting deformation→second feeding roller→intertwining→auxiliary roller→setting hot box→setting overfeeding→oiling by oiling ring spraying→winding and forming by winding machine;

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

[0051] The selection of this oil agent in the pre-cooling process can not only ensure a good pre-cooling effect, but also reduce the friction between the wire and the wire guide. This is because the molecular state of the oil is an organic chain shape, and the surface tension of the oil is very large. The oil on the surface of the wire will form an oil film, which will separate the contact with the wire guide and form a floating state, reducing friction. The molecular state of water is an independent slight chain state, and the surface tension of water is very small. There is water on the surface of the wire, which will not contact the wire. Instead, it will wash away the particles on the surface of the wire, reducing friction. In addition, the thermal conductivity of water is better, and the cooling of the wire is more uniform and efficient. However, long-term water cooling will cause corrosion to the equipment, so an oil-water mixture is used here.

[0052] The device used for pre-oiling is the oiling yarn guide II. The oil used by the oiling yarn guide II is crude oil (brand: Zhejiang Chuanhua, specification TF-702L, concentration is 100%). The main purpose is to improve the bundling of the yarn before false twisting and deformation, and reduce the friction of the yarn path.

[0053] As the preferred technical solution:

[0054] In the method for preparing the breathable and easy-to-dye polyester special-shaped DTY, the cross section of the POY precursor yarn is trilobal, cross-shaped, pentlobal and I-shaped.

[0055] The method for preparing a breathable and easy-to-dye polyester special-shaped DTY as described above, the process parameters include: biphenyl temperature of 200-250°C; pre-network pressure of 0.03-0.04 MPa; cooling water temperature of 18-22°C, cooling wind speed of 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 is 2-2.5 m / s, the flow rate of cooling water in the flat cooling chamber is 2.5-3 m / s, and the flow rate of cooling water in the cooling chamber is 3-3.5 m / s; false twisting texturing uses a polyurethane disc with a combination of 1-4-1, and the D / Y ratio is 1.4-1.6 (the D / Y ratio is the ratio of the surface speed of the friction disc to the speed of the yarn leaving the false twister) ; The ratio of the speed of the second wire feeding roller to the 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 (also called the cross angle) is 25°~28°, and the forming cone angle is 65°~70°; the oil agent used for the oiling ring is crude oil (brand: Zhejiang Chuanhua, specification TF-702L, concentration is 100%), 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.

[0056] The method for preparing a breathable and easy-to-dye polyester shaped DTY as described above has a single yarn fineness of ≤0.55 dtex, an elongation at break of 20.5-23%, a breaking strength of 3.95-4.15 cN / dtex, an oil content CV value of 3.0-5.5%, a profile of 45-50%, a dyeing M rate of 98-99.5%, and a tension CV value of 0.88-1.07%.

[0057] Beneficial effects:

[0058] (1) The invention discloses a breathable and easy-to-dye polyester special-shaped DTY preparation device. The design of the inverted gourd-shaped air 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 filaments when passing through each cooling chamber is gradually reduced.

[0059] (2) The method for preparing a breathable and easy-to-dye polyester special-shaped DTY of the present invention adopts an inverted gourd-shaped air duct cooling and a single-filament heating process, thereby improving the cooling and heating efficiency, ensuring the cooling and heating uniformity of the filaments, and improving the dyeing M rate of the fiber, and the filaments are dyed uniformly; and a pre-oiling process is added to improve the cohesion of the filaments, reduce the friction between the filaments and the filament path, and reduce the breakage rate;

[0060] (3) The preparation method of the breathable and easy-to-dye polyester special-shaped DTY of the present invention adopts an oiling combination in the DTY process. When oiling, on the one hand, a ring-shaped oiling method that does not contact the filaments is adopted, and on the other hand, a hollow oiling ring is adopted, which can be lubricated by oil, thereby reducing friction damage to the filaments, reducing the resistance of the filaments during movement, and reducing the breakage of the filaments. In addition, the uniformity of the oiling is also well controlled, and the oil content CV value of the filaments is small. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0064] Figure 4 It is a schematic diagram of the structure of the cooling device of the present invention;

[0065] Figure 5 This is a schematic diagram of the cooling of the wire strip;

[0066] Figure 6 This is a schematic diagram of the structure of the oil ring of the present invention;

[0067] Figure 7 It is a cross-sectional view of the oiling ring when the cross section of the POY precursor of the present invention is a cross-shaped one;

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

[0069] Fig. 9 It is a schematic diagram of the structure of the hollow bowl-shaped column section of the cooling device of the present invention;

[0070] Fig.10 It is a schematic diagram of the structure of the hollow cylindrical section of the cooling device of the present invention;

[0071] Fig.11 It is a schematic diagram of the structure of the hollow trumpet-shaped column section of the cooling device of the present invention;

[0072] Fig.12 The shape of the cross-shaped spinneret hole of the present invention;

[0073] Fig.13 The shape of the I-shaped spinneret hole of the present invention;

[0074] Fig.14 The shape of the three-leaf spinneret hole of the present invention;

[0075] Fig.15 The shape of the five-leaf spinneret hole of the present invention;

[0076] Fig.16 This is a schematic diagram of the oiling wire guide used in the pre-cooling process and the pre-oiling process of the present invention;

[0077] Fig.17 It is a schematic diagram of the main view of the ring-blowing cooling device of the prior art (CN112708976B);

[0078] Fig.18 It is a right side schematic diagram of a ring-blowing cooling device of the prior art (CN112708976B);

[0079] Fig.19 It is a 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 IV, 4.4-outlet IV, 4.5-inner interlayer, 4.6-outer interlayer, 4.7-mixing plate, 4.8-hollow tube, 4.9-nozzle I, 4.10-nozzle II, 5-cooling device, 5.1-oiling wire guide I, 5.2-oiling wire guide II, 5.3-slow cooling chamber, 5.4-flat cooling chamber, 5.5 cooling chamber, 5.31-inlet I, 5.41-inlet II, 5.51-inlet III, 5.32-outlet I, 5.42-outlet II, 5.52-outlet III, 6-false twister, 7-second wire feeding roller, 8-middle network, 9-auxiliary roller, 10-setting hot box, 11-setting wire feeding roller, 12-oiling device, 12.1-oiling ring, 12.2-pressure stabilizing chamber, 12.3-rectifier plate, 12.4-rectifier hole, 12.5-rectifier chamber, 12.6-oiling hole, 13-winding machine. DETAILED DESCRIPTION

[0081] 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.

[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 Low Elastic Yarn, a length measuring instrument (YG086 yarn length measuring instrument of Changzhou Textile Instrument Factory) is used. The length measuring instrument is wound with a specified length of yarn, and then its weight is weighed with a balance, and converted into the fineness of the yarn, that is, the linear density, according to the formula; the formula is: linear density (dtex) = X1 / L×10000, where linear density is in decitex (dtex); X1 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 Low-elastic Yarn, a fully automatic single yarn strength tester (manufacturer: Changzhou Textile Instrument Factory Co., Ltd., model: YG023B-Ⅲ) was used to pull the fiber to break under uniform tension at a constant speed, and the breaking strength and elongation at break of the sample were obtained from the data display.

[0085] Oil content CV value: According to GB / T 8960-2015 Polyester Drawn Yarn, a nuclear magnetic resonance fiber oil uptake rate tester is used. According to the nuclear magnetic resonance method, a section of fiber is selected to test the oil uptake rate (oil content) of the yarn. The average and standard deviation of the oil content of the fiber at the same spinning position are calculated, and finally the oil content CV value is obtained.

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

[0087] Dyeing M rate: According to the standard "GB / T 14460-2015 Polyester Low-elastic Yarn", calculate the proportion of yarns with dyeing uniformity gray card reaching 4.0 and above to all dyed DTY yarns to obtain the dyeing M rate.

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

[0089] Evaluation of DTY appearance hairy yarn: DTY yarn cones are graded according to GB / T 14460-2015 Polyester Low-elastic Yarn.

[0090] A breathable and easy-to-dye polyester special-shaped DTY preparation device, such as Figures 2~11 , Fig.16 As shown, it includes a cooling device, a pre-network heating device, an oiling device, an oil pipe I, an oil pipe II and an oil pipe III;

[0091] The cooling device is an inverted gourd-shaped wind tube; the inverted gourd-shaped wind tube 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 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;

[0093] 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;

[0094] The hollow trumpet-shaped column segment 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 is toward the central axis; the upper base of the hollow bowl-shaped column segment is larger than the cross section of the hollow cylindrical segment, and the lower base of the hollow trumpet-shaped column segment is smaller than the cross section of the hollow cylindrical segment;

[0095] 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. 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 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 diameters of the circular ring plate II and the lower bottom plate is 3:1; 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 spacing a between the upper bottom plate and the circular ring plate I is 200-300 mm; the spacing b between the circular ring plate I and the circular ring plate II is 300-400 mm; the spacing c between the circular ring plate II and the lower bottom plate is 500-600 mm;

[0097] 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;

[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 used to input and output cooling water into and out of the slow cooling chamber 5.3 respectively;

[0100] 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;

[0101] 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;

[0102] A plurality of hollow cylinders I (i.e., cooling air holes) penetrating the inverted gourd-shaped wind tube are evenly distributed on the circumference of the inverted gourd-shaped wind tube; one end of the hollow cylinder I is sealedly connected to the inverted gourd-shaped outer tube, and the other end of the hollow cylinder I is sealedly connected to the inverted gourd-shaped inner tube;

[0103] The hollow cylinder I disposed on the hollow bowl-shaped column section is oriented to be inclined downward at 45°, that is, the blowing direction is inclined downward at 45°; the hollow cylinder I disposed on the hollow cylindrical section is oriented to be horizontal, that is, the blowing direction is horizontal; the hollow cylinder I disposed on the hollow trumpet-shaped column section is oriented to be inclined upward at 60°, that is, the blowing direction is inclined upward at 60°;

[0104] The pre-network heating device (i.e., the heating cylinder) is a hollow cylinder II, and the inner wall and the outer wall of the hollow cylinder II contain two sealed hollow cylindrical interlayers, 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, and the inlet port IV 4.3 and the outlet port IV 4.4 are used for inputting and outputting heated biphenyl respectively;

[0106] 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 for inputting and outputting compressed air respectively. 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 being evenly heated by the mixing plate 4.7, the compressed air is discharged 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 connected to the air outlet 4.2, and the other end passes through the inner interlayer 4.5 to communicate with the inside of the hollow cylinder II, and forms 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 inside of the hollow cylinder II, and forms a nozzle I 4.9;

[0108] Nozzle I 4.9 and nozzle II 4.10 are circular holes with a diameter ratio of 2:3;

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

[0110] 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 50-60 mm, and the inner diameter is 5-6 mm;

[0111] 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, and the diameter of the rectifying hole 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 stabilizing chamber 12.2 from inside to outside along the radial direction;

[0112] The inner wall of the upper oil ring 12.1 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 12.1 is connected to the oil pipe I through a hollow connecting rod;

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

[0114] 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;

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

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

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

[0118] Specific use process: biphenyl is input into the outer interlayer 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 after being uniformly heated from the inner interlayer 4.5 of the heating cylinder 4, it exits from the air outlet 4.2, and then enters the hollow tube 4.8, and is respectively sprayed from the nozzle I 4.9 and the nozzle II 4.10 to blow toward the wire strip; a temperature tester is set between the air outlet 4.2 and the hollow tube 4.8, and the flow of biphenyl is controlled by the electromagnetic valve, and the biphenyl flow of the heating cylinder and the temperature tester form a feedback circuit control. When the monitored temperature is lower than the set temperature, a signal is generated to feedback to the electromagnetic valve to increase the opening, otherwise the opening of the electromagnetic valve is reduced;

[0119] Cooling water of different flow rates is introduced into the slow cooling chamber 5.3, the flat cooling chamber 5.4 and the cooling collecting chamber 5.5 in the inverted gourd-shaped wind tube, and the wind is blown toward the silk strips from the hollow cylinders I evenly distributed on the circumference of the inverted gourd-shaped wind tube. When the wind passes through the inverted gourd-shaped wind tube, it is affected by the cooling water temperature of each cooling chamber and has different wind temperatures. Affected by the structure of each section of the inverted gourd-shaped wind tube, the wind blows toward the silk strips in different directions and speeds, and the cooling is more uniform.

[0120] During oiling, the yarn passes through the yarn guide assembly consisting of the oiling yarn guide I 5.1 and the yarn guide II 5.2, and is coaxially and concentrically connected to the oiling ring 12.1, and is oiled by the oil sprayed from the oiling hole 12.6.

[0121] Example 1

[0122] 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 40mm; the inner diameter of the circular plate I is 30mm; the distance a between the upper bottom plate and the circular plate I is 200mm; the distance b between the circular plate I and the circular plate II is 300mm; the distance c between the circular plate II and the lower bottom plate is 500mm; the outer diameter of the circular ring is 50mm, and the inner diameter is 5mm; the diameter of the rectifying hole is 1mm; the diameter of the oiling hole is 0.5mm; the width of the narrowest part of the U-shaped porcelain piece is 1mm, the width of the widest part is 2mm, and the bottom of the U-shaped porcelain piece is provided with a through hole with a diameter of 0.7mm;

[0123] The specific preparation method is as follows: Figure 1 As shown, POY raw yarn (i.e., yarn 1) is used as raw material, and the DTY process is adopted to prepare breathable and easy-to-dye polyester special-shaped DTY; the DTY process includes: POY raw yarn → heating by pre-interlacing heating device (i.e., heating cylinder 4) → heating by first feeding roller 3 → pre-cooling → cooling by cooling device 5 → pre-oiling → false twisting deformation by false twister 6 → false twisting deformation by second feeding roller 7 → middle interlacing 8 → auxiliary roller 9 → shaping hot box 10 → shaping overfeeding 11 → oiling by oiling device 12 → winding and forming by winding machine 13;

[0124] Among them, the specification of POY raw yarn is 33dtex / 72f, such as Fig.12 As shown, the cross section of the POY raw yarn is a cross shape, the cross leaf length U1 is 0.115 mm, and the leaf width W1 is 0.018 mm; the device used for pre-cooling is an oiling yarn guide I 5.1, and the oil agent used by the oiling yarn guide I 5.1 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 agent is 30%; the device used for pre-oiling is an oiling yarn guide II 5.2, and the oil agent used by the oiling yarn guide II 5.2 is crude oil;

[0125] The process parameters are as follows: biphenyl temperature is 205°C; the pressure of pre-network 2 is 0.03 MPa; the temperature of cooling water is 20℃, and the cooling wind speed is 0.5m / s; the flow rate of cooling water in the slow cooling chamber is 2m / s, the flow rate of cooling water in the flat cooling chamber is 2.5m / s, and the flow rate of cooling water in the cold collecting chamber is 3m / s; the false twist texturing adopts a polyurethane disc with a combination of 1-4-1 and a D / Y ratio of 1.57; the ratio of the second wire feeding roller speed to the first roller feeding speed is 1.53, and the processing speed of the second wire feeding roller is 500 meters / minute; the middle network air pressure is 0.12MPa; the temperature of the setting hot box is 135℃, 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 0.003MPa; the oiling pressure of the oiling wire guide I is 0.001MPa; the oiling pressure of the oiling wire guide II is 0.001MPa.

[0126] The final breathable and easy-to-dye polyester special-shaped DTY has a fineness of 22dtex, an elongation at break of 22.8%, a breaking strength of 4.1cN / dtex, an oil content CV value of 3.5%, a special-shaped degree of 50%, a dyeing M rate of 98.6%, a tension CV value of 0.93%, and DTY appearance evaluation: less hair.

[0127] Comparative Example 1

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

[0129] The prepared polyester shaped DTY has a fineness of 22dtex, an elongation at break of 18.9%, a breaking strength of 3.7cN / dtex, an oil content CV value of 3.5%, a shapedness of 35%, a dyeing M rate of 95.2%, and a tension CV value of 3.12%; DTY appearance evaluation: a lot of hair.

[0130] By comparing Comparative Example 1 with Example 1, it can be found that the tension CV value of Comparative Example 1 is too large, and the dyeing M rate, profile, breaking strength, and breaking elongation are reduced. This is because the cooling plate of Comparative Example 1 is cooled by heat transfer, and the cooling effect of the profiled yarn is not good, which is not conducive to the transmission of twist during false twisting, and the curling structure is unstable, and the tension is unstable, so the tension CV value is too large; while the inverted gourd-shaped cooling device of Example 1 adopts different cooling methods according to the molecular chain activity of the yarn at different stages, so that the yarn is cooled more fully and evenly, the curling structure is stable, the tension is stable, and the tension CV value is small; in addition, the yarn is cooled in contact with the cooling plate, and the resistance increases during operation. The yarn is damaged after being subjected to the resistance, resulting in the breakage of the single yarn, the decrease of the breaking elongation and breaking strength, and the increase of the hairy yarn; and The inverted gourd-shaped cooling device of Example 1 does not contact the filaments, so the filaments will not be worn, and different cooling methods are adopted according to the molecular chain activities at different stages of the filaments, so that the filaments can be cooled more fully and evenly, so there are fewer single filament breakages, fewer hairy fibers, and higher elongation at break and breaking strength; the cross-section of the special-shaped wires is special-shaped and has a large specific surface area. The contact cooling of the filaments and the cooling plate in Comparative Example 1 is prone to uneven cooling, and the curling structure formed by the fiber during the false twisting process is uneven, which leads to color differences, striped fibers, etc. in the dyeing, so the dyeing M rate is low; the inverted gourd-shaped cooling device of Example 1 adopts different cooling methods according to the molecular chain activities at different stages of the filaments, so that the filaments can be cooled more fully and evenly, the curling structure is stable, the tension is stable, the dyeing is uniform, and the dyeing M rate is high.

[0131] Example 2

[0132] 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 42mm; the inner diameter of the circular plate I is 32mm; the distance a between the upper bottom plate and the circular plate I is 220mm; the distance b between the circular plate I and the circular plate II is 320mm; the distance c between the circular plate II and the lower bottom plate is 520mm; the outer diameter of the circular ring is 52mm, and the inner diameter is 5mm; the diameter of the rectifying hole is 1.1mm; the diameter of the oiling hole is 0.5mm; the width of the narrowest part of the U-shaped porcelain piece is 1mm, the width of the widest part is 2mm, and the bottom of the U-shaped porcelain piece is provided with a through hole with a diameter of 0.7mm;

[0133] 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;

[0134] Among them, the specification of POY raw yarn is 53dtex / 144f, such as Fig.13 As shown, the cross section is an I-shaped, the length U2 of the upper lobe of the I-shaped is 0.02mm, the length U2.1 of the lower lobe is 0.03mm, the lobe width W2 is 0.01mm, and the lobe height V2 is 0.67mm; the device used for pre-cooling is an oiling wire guide I, and the oil agent used by the oiling wire 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 agent is 32%; the device used for pre-oiling is an oiling wire guide II, and the oil agent used by the oiling wire guide II is crude oil;

[0135] The process parameters are as follows: biphenyl temperature is 210℃; pre-network pressure is 0.032 MPa; the temperature of cooling water is 19℃, and the cooling wind speed is 0.3m / s; the flow rate of cooling water in the slow cooling chamber is 2.1m / s, the flow rate of cooling water in the flat cooling chamber is 2.6m / s, and the flow rate of cooling water in the cold collecting chamber is 3.1m / s; the false twist deformation adopts a polyurethane disc with a combination of 1-4-1 and a D / Y ratio of 1.56; the ratio of the second wire feeding roller speed to the first roller feeding speed is 1.55, and the processing speed of the second wire feeding roller is 500 meters / minute; the middle network air pressure is 0.14MPa; the temperature of the setting hot box is 140℃; 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 for the oiling ring is crude oil, and the oiling pressure of the oiling ring is 0.0032MPa; the oiling pressure of the oiling wire guide I is 0.0012 MPa; the oiling pressure of the oiling wire guide II is 0.0012MPa.

[0136] The final breathable and easy-to-dye polyester special-shaped DTY has a fineness of 33dtex, an elongation at break of 22.3%, a breaking strength of 4.08cN / dtex, an oil content CV value of 3.0%, a special-shaped degree of 50%, a dyeing M rate of 98.9%, a DTY tension CV value of 1.06%, and DTY appearance evaluation: less hair.

[0137] Comparative Example 2

[0138] A method for preparing polyester special-shaped DTY is basically the same as that in Example 2, except that the method uses Figures 17 and 18 The cooling is performed by the ring-blowing cooling device of the patent CN112708976B shown.

[0139] The tension CV value of the prepared polyester shaped DTY is 3.08%; the appearance evaluation of DTY is that there are many hairy fibers.

[0140] By comparing Comparative Example 2 with Example 2, it can be found that the tension CV value of Comparative Example 2 is too large. This is because Comparative Example 2 uses cooling air to cool the entire silk strip in the ring-blowing cooling device. Since the cooling device is vertically installed on the texturizing machine and the cooling device is relatively long, the cooling deviation between the various sections of the silk strip will be large due to the long cooling distance. This is mainly because the cooling air is attenuated after rectification, resulting in the cooling wind speed at the upper end of the wind tube being lower than that at the lower end of the wind tube, resulting in a large cooling deviation between the various sections, resulting in an unstable curling structure and unstable tension, so the tension CV value is too large. The inverted gourd-shaped cooling device of Example 2 adopts different cooling methods according to the molecular chain activity of the silk strip at different stages, so that the silk strip can be cooled more fully and evenly, the curling structure is stable, the tension is stable, and the tension CV value is small.

[0141] Example 3

[0142] A method for preparing polyester special-shaped DTY is basically the same as that in Example 2, except that the method uses the deformation hot box contact heating of the prior art (ie, patent CN112708976B).

[0143] The elongation at break of the prepared polyester shaped DTY is 20.3%, the breaking strength is 3.94 cN / dtex, the oil content CV value is 3.0%, the degree of special shape is 50%, the dyeing M rate is 97.2%, the DTY tension CV value is 1.06%, and the DTY appearance evaluation: there are many hairy fibers.

[0144] Comparing Example 3 with Example 2, it can be found that the dyeing M rate, breaking strength and breaking elongation of Example 3 are reduced. This is because the yarn of Example 3 is heated in contact with the deforming hot box, and the resistance increases during operation. The yarn is damaged by the resistance, resulting in single yarn breakage, reduced breaking elongation and breaking strength, and increased hairy yarns. The cross-section of the special-shaped yarn is special-shaped and has a large specific surface area. The contact heating of the yarn and the hot box is prone to uneven heating, resulting in stiff yarns, light and dark color differences, etc., resulting in a low dyeing M rate.

[0145] Example 4

[0146] A method for preparing breathable and easy-to-dye polyester special-shaped DTY, using the breathable and easy-to-dye polyester special-shaped DTY preparation device as described above, the preparation device is specifically selected as follows: the outer diameter of the circular plate I is 45 mm; the inner diameter of the circular plate I is 35 mm; the distance a between the upper bottom plate and the circular plate I is 250 mm; the distance b between the circular plate I and the circular plate II is 350 mm; the distance c between the circular plate II and the lower bottom plate is 550 mm; the outer diameter of the 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 piece is 1.2 mm, the width of the widest part is 2.5 mm, and the bottom of the U-shaped porcelain piece is provided with a through hole with a diameter of 0.85 mm;

[0147] 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;

[0148] Among them, the specification of POY raw yarn is 85dtex / 144f. Fig.14 As shown, the cross section of the POY raw yarn is a trilobal shape, the angle α3 between the three lobes of the trilobal shape 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 an oiling yarn guide I, and the oil agent used by the oiling yarn 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 agent is 35%; the device used for pre-oiling is an oiling yarn guide II, and the oil agent used by the oiling yarn guide II is crude oil;

[0149] The process parameters are as follows: biphenyl temperature is 220℃; pre-network pressure is 0.035 MPa; the temperature of cooling water is 22℃, and the cooling wind speed is 0.4m / s; the flow rate of cooling water in the slow cooling chamber is 2.3m / s, the flow rate of cooling water in the flat cooling chamber is 2.8m / s, and the flow rate of cooling water in the cold collecting chamber is 3.2m / s; the false twist texturing adopts a polyurethane disc with a combination of 1-4-1 and a D / Y ratio of 1.53; the ratio of the second wire feeding roller speed to the first roller feeding speed is 1.58, and the processing speed of the second wire feeding roller is 550m / min; the middle network air pressure is 0.15MPa; the temperature of the setting hot box is 140℃, 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 for the oiling ring is crude oil, and the oiling pressure of the oiling ring is 0.0035MPa; the oiling pressure of the oiling wire guide I is 0.0015 MPa; the oiling pressure of the oiling wire guide II is 0.0015MPa.

[0150] The final breathable and easy-to-dye polyester special-shaped DTY has a fineness of 55dtex, an elongation at break of 21.9%, a breaking strength of 4.1cN / dtex, an oil content CV value of 5.5%, a special shape of 48%, a dyeing M rate of 99.1%, a DTY tension CV value of 0.88%, and DTY appearance evaluation: less hair.

[0151] Example 5

[0152] A method for preparing polyester special-shaped DTY is basically the same as that of Example 4, except that the oiling device of the prior art (patent CN112708976B) is used for oiling.

[0153] The elongation at break of the prepared polyester shaped DTY is 21.7%, the breaking strength is 3.88 cN / dtex, the oil content CV value is 10.2%, the degree of special shape 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 hairy fibers.

[0154] By 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 circular 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 Fig.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 0.032 mm, and the leaf length U4 is 0.16 mm; the device used for pre-cooling is an oiling yarn guide I, and the oil used by the oiling yarn 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 an oiling yarn guide II, and the oil used by the oiling yarn guide II is crude oil;

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

[0160] The final breathable and easy-to-dye polyester special-shaped DTY has a fineness of 83dtex, an elongation at break of 21.4%, a breaking strength of 4.15cN / dtex, an oil content CV value of 4.5%, a special-shaped degree of 48%, a dyeing M rate of 99.3%, a DTY tension CV value of 0.91%, and DTY appearance evaluation: less hair.

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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