A device and method for preparing high-profile polyester elastic yarn

Abstract

The present invention belongs to the field of spinning equipment, and relates to a device and method for preparing high-profile polyester textured yarn. The device includes a texturing heating box, which comprises a tube body, an upper end cover, a lower end cover, an air flow baffle, a ventilation pipe and a heating fan; the tube body is arranged vertically, and the air flow baffle is located inside the tube body and does not contact the tube body; the air flow baffle is arranged vertically and has a circular arc-shaped cross section, and the notch of the circular arc faces right; the tube body is provided with an air inlet and a rectifying hole, one end of the ventilation pipe is connected to the heating fan, and the other end is connected to two air inlets; the cooperation of each component enables the filament bundle to enter the tube body through the filament bundle inlet, and is protected by the air flow baffle and does not contact the air entering from the two air inlets. The method is to use this device to spin high-profile polyester textured yarn. The present invention can ensure uniform heating and cooling of the filament, keep the filament with high profile, and make the dyeing more uniform.

Description

Technical Field

[0001] The present invention belongs to the technical field of polyester production, and particularly relates to a device and method for preparing polyester elastic yarn with high profile degree. Background Art

[0002] In the textile industry, with the improvement of people's pursuit of clothing comfort, polyester elastic yarn with high profile degree has attracted much attention. The fabric woven from it has characteristics such as light weight and breathability, and can well meet the market demand.

[0003] Currently, polyester filament POY is generally made into elastic yarn through false twist texturing to obtain good bulk properties. In this process, uniform heating of the filament during twisting is crucial. However, due to the special cross-section, high profile degree, and large specific surface area of high-profile filaments, they are extremely sensitive to temperature and frictional force in the filament channel. If the blowing temperature or frictional force is uneven during heating, it is extremely easy to cause fluctuations in filament tension and uneven heating. Therefore, when heating such filaments, it is necessary to ensure that the heating temperature at each point is uniform, and avoid contact between the filament channel and the filament to prevent the volatilization of oil agent and the generation of dirt, which will increase the friction of the filament, cause single filament breakage or tension fluctuations.

[0004] There are various heating boxes in the prior art, and each has its own drawbacks:

[0005] A heating box disclosed in the patent with publication number CN117947552A: As Figure 5 shown, the heating air of this heating box is parallel to the running direction of the filament, which reduces the disturbance of the hot air to the filament to a certain extent. However, the heating air blows from bottom to top, opposite to the running direction of the filament. The heating effect is acceptable for round-hole filaments. However, for high-profile filaments such as caterpillar and cross-shaped filaments, the high-speed running filament is opposite to the heating air. Due to the large specific surface area of the profiled filament, it is similar to a green leather train running against the wind (the wind resistance is greater than that of a round filament like a bullet train running against the wind), and the frictional force generated by the heating air on it is greater, resulting in too large surface tension of the filament, easy breakage, or large difference in single-filament heating, more heat on the outer layer of the filament and less heat on the inner layer of the filament, causing a large temperature difference between the inner and outer single filaments, and ultimately resulting in uneven dyeing in the later stage.

[0006] A heating box in which the filament is heated by contacting the heat box: As Figure 6 shown, in this heating method, the oil agent in the filament volatilizes and forms scale at high temperature, adheres to the inside of the heat box, hinders the heat transfer between the filament and the heat box, and makes the filament heated unevenly.

[0007] A heating box heated by hot air: As Figure 7 shown, this heating box uses hot air for heating. The filament does not directly contact the heat box, and the frictional force is greatly reduced, and the filament breakage is less. However, the negative pressure generated by extracting oil fume will cause the air in the heat box to form turbulence, and the filament is significantly disturbed; if the oil fume fan is turned off, a large amount of oil fume will accumulate in the heat box to form droplets, polluting the filament.

[0008] Heating air duct with rectifying holes: As Figure 8 shown, the side wall of the air duct is provided with rectifying holes, and the inner wall encloses a cavity. The hot air blows through the rectifying holes to the heating wire strips in the cavity, with high heating efficiency and uniform heating of the wire strips. However, compared with Figure 5 , Figure 8 the technologies in

[0009] the wire strips are more significantly disturbed during the heating process. Summary of the Invention

[0010] The purpose of the present invention is to solve the problems existing in the prior art and provide a device and method for preparing high-profile polyester textured yarn.

[0011] To achieve the above object, the present invention adopts the following technical solutions:

[0012] A device for preparing high-profile polyester textured yarn, comprising a deformation heating box, the deformation heating box includes a pipe body, an upper end cover, a lower end cover, an air flow baffle, a ventilation pipe and a heating fan;

[0013] The pipe body is arranged vertically, the upper end is covered by the upper end cover, and the lower end is covered by the lower end cover;

[0014] The air flow baffle is located inside the pipe body and does not contact the pipe body; the air flow baffle is arranged vertically and its cross-section is arc-shaped, with the notch of the arc facing right; the upper end of the air flow baffle fits with the upper end cover, and the lower end fits with the lower end cover;

[0015] There are two front and rear air inlets on the pipe body, both air inlets are located on the left side of the air flow baffle and the air inlet directions are all towards the air flow baffle;

[0016] There are rectifying holes on the pipe body, and the rectifying holes are located on the right side of the air flow baffle;

[0017] There is a yarn bundle inlet on the upper end cover and a yarn bundle outlet on the lower end cover, and the yarn bundle outlet is directly below the yarn bundle inlet;

[0018] One end of the ventilation pipe is connected to the heating fan, and the other end is connected to the two air inlets;

[0019] Each component cooperates with each other so that the yarn bundle enters the pipe body through the yarn bundle inlet and is protected by the air flow baffle and does not contact the air entering from the two air inlets.

[0020] As a preferred technical solution:

[0021] A preparation device for high-profile polyester elastic yarn as described above, the cross-section of the pipe body is oblong, and the oblong is composed of two semi-circles and a line segment connecting the two semi-circles. The number of vertical symmetry planes of the pipe body is 2, which are respectively denoted as vertical symmetry plane a and vertical symmetry plane b. The vertical symmetry plane a passes through the two points with the farthest distance on the oblong. The vertical symmetry plane a is parallel to the left-right direction, and the vertical symmetry plane b is parallel to the front-back direction;

[0022] The vertical symmetry plane of the air flow baffle is coplanar with the vertical symmetry plane a of the pipe body, and the central axis of the air flow baffle (the air flow baffle is equivalent to a part intercepted from a cylinder, and the central axis of the air flow baffle is the central axis of the cylinder) is located on the vertical symmetry plane b of the pipe body;

[0023] The central axis of the filament inlet coincides with the central axis of the air flow baffle;

[0024] The two air inlets are symmetrically distributed along the vertical symmetry plane a of the pipe body.

[0025] A preparation device for high-profile polyester elastic yarn as described above, the diameter of the semi-circle is 20 - 30 mm, and the length of the line segment is 10 - 15 mm; the central angle of the arc is 150 - 180°, and the diameter of the circle corresponding to the arc is 8 - 10 mm.

[0026] A preparation device for high-profile polyester elastic yarn as described above, the air inlet directions of the two air inlets form an angle of 10 - 15° with the vertical symmetry plane a of the pipe body. The wind gradually moves away from the vertical symmetry plane a of the pipe body after entering from the two air inlets. Such a design can reduce wind resistance and avoid the formation of turbulence and eddy currents. If the angle is too small, the wind resistance will be large. If the angle is too large, too much air flow will flow towards the inner wall of the pipe body and cannot flow along the air flow baffle, resulting in low heating efficiency.

[0027] A preparation device for high-profile polyester elastic yarn as described above, the two air inlets are strip-shaped, the width direction is parallel to the vertical direction, and the width is 480 - 580 mm; the height of the pipe body is 500 - 600 mm.

[0028] A preparation device for high-profile polyester elastic yarn as described above, the number of rectifying holes is multiple, arranged in sequence from top to bottom. All the rectifying holes are frustum-shaped, with the large end on the left and the small end on the right. In this way, hot air can gather on the inner wall, and the wind pressure on the inner wall is greater than that on the outer wall, which is conducive to the stability of hot air rectification and prevents the formation of turbulence at the rectifying holes, resulting in pressure fluctuations inside the pipe body. The central axes of all the rectifying holes are located on the vertical symmetry plane a of the pipe body.

[0029] A preparation device for high-profile polyester textured yarn as described above, the large end diameter of all the rectifying holes is twice the small end diameter; the small end diameter of the rectifying hole at the uppermost position is 1 - 2 mm, and for two adjacent rectifying holes, the small end diameter of the upper rectifying hole is 1.1 times that of the lower rectifying hole. Such a design enables the axial wind speed of the heating air to decrease successively from top to bottom under the negative pressure of the range hood. This is mainly because the filament requires a large amount of heat at the initial stage of heating and a small amount of heat at the end, and at the end, the filament is already in a vitrified state, and the wind pressure in the heating chamber should be small to reduce filament swaying.

[0030] A preparation device for high-profile polyester textured yarn as described above, the texturing heating box further includes side plates. The side plates and the right end of the tube body enclose an exhaust chamber, and an exhaust port for communicating with an exhaust fan is provided at the right end of the exhaust chamber.

[0031] A preparation device for high-profile polyester textured yarn as described above, the preparation device for high-profile polyester textured yarn further includes a water cooler; on the filament bundle running path, the water cooler is located in front of the texturing heating box. After water cooling, air cooling is relied on to remove water from the filament and further evenly cool it; the water cooler includes an adjusting rod, a wire guiding wheel, and a water tank; the adjusting rod is arranged vertically, the wire guiding wheel is located at the lower end of the adjusting rod and is simultaneously located in the water tank; the water tank is filled with alkaline water, the concentration of the alkaline water is 50 - 60 wt%, and the temperature of the alkaline water is 20 - 30 °C.

[0032] The present invention also provides a preparation method for high-profile polyester textured yarn, using a preparation device for high-profile polyester textured yarn as described in any one of the above. The single filament fineness of the high-profile polyester textured yarn is ≤ 0.55 dtex, the cross-section is in the shape of a rich character, a king character, a caterpillar shape, or a hollow shape, the breaking elongation is 21.76 - 23.85%, the breaking strength is 4.05 - 4.24 cN / dtex, the dyeing M rate is 98.8 - 99.5%, and the profile degree is more than 50%.

[0033] Beneficial effects:

[0034] According to the characteristics of high-profile filaments with a large specific surface area and strong heat exchange ability, the heating device of the present invention is designed with an air flow baffle to block the filament bundle. At the same time, the heating air forms a circular flow around the filament bundle based on the principle of winding around a cylinder, and the heating air does not directly blow on the filament. This design increases the heat exchange speed, not only can ensure uniform heating of the filament, but also avoids direct contact between the hot air and the filament bundle, which may cause disturbance to the filament bundle, and at the same time improves the heating efficiency of the high-profile filament.

[0035] The present invention can ensure uniform heating and cooling of the filament, keep the filament in a high-profile state, and make the dyeing more uniform. Description of the drawings

[0036] Figure 1Flow chart for the preparation of highly profiled polyester drawn textured yarn of the present invention;

[0037] Figure 2 Partial structural schematic diagram of the heating box in the present invention; wherein (a) is the structural schematic diagram of the upper cover plate and the lower cover plate, (b) is the structural schematic diagram of the box body, and (c) is the top view structural schematic diagram of the box body;

[0038] Figure 3 Horizontal sectional structural schematic diagram of the texturing heating box of the present invention, wherein the heating fan is not shown in the figure, and the arrow direction is the air flow direction;

[0039] Figure 4 Arrangement schematic diagram of the rectifying holes on the pipe body in the present invention;

[0040] Figure 5 Schematic diagram of the filament passing through the axial heating texturing hot box of the prior art;

[0041] Figure 6 Schematic diagram of the filament passing through the contact type texturing heating box of the prior art;

[0042] Figure 7 Schematic diagram of the filament passing through the non-contact type texturing heating box of the prior art;

[0043] Figure 8 Schematic diagram of the ring air blower of the texturing heating box of the prior art through which the filament passes;

[0044] Figure 9 Schematic diagram of the filament passing through the water cooler of the present invention;

[0045] In the figure, 1 - POY raw silk, 2 - pre-networker, 3 - first feeding roller, 4 - texturing heating box, 4.1 - pipe body, 4.2 - ventilation pipe, 4.3 - air inlet, 4.4 - air flow baffle, 4.6 - rectifying hole, 4.7 - smoke exhaust chamber, 4.10 - upper end cover, 4.12 - filament bundle inlet, 5 - water cooler, 5.1 - adjusting rod, 5.2 - wire guiding wheel, 5.4 - water tank, 5.5 - air cooler, 6 - false twister, 7 - second feeding roller, 8 - middle networker, 9 - setting hot box, 10 - third feeding roller, 11 - oiling wheel, 12 - fourth feeding roller, 13 - DTY winding machine. Detailed implementation manners

[0046] The present invention will be further described below in conjunction with the detailed implementation manners. 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.

[0047] The following are the test methods for relevant indicators:

[0048] Breaking strength and elongation at break: The test is carried out with reference to the standard "GB / T 14460-2015 Polyester drawn textured yarn DTY". An automatic single yarn strength tester (manufactured by Changzhou Textile Instrument Factory Co., Ltd., model YG023B-Ⅲ) is used. Under the condition of constant speed and uniform tension, the fiber is pulled until it breaks, and the breaking strength and elongation at break of the specimen are obtained from the data display.

[0049] Dyeing M rate: The test is carried out with reference to the standard "GB / T 14460-2015 Polyester drawn textured yarn DTY". Calculate the proportion of the yarn with a dyeing uniformity grey scale of 4.0 or above in all dyed DTY yarns to obtain the dyeing M rate.

[0050] Profile degree: The test is carried out with reference to the standard "FZ / T 50002-2013 Test method for profile degree of chemical fiber".

[0051] The devices used in Examples 1 to 6 to prepare high-profile polyester textured yarns are as Figure 1 shown. In the order of the filament running path of the POY raw yarn 1, it successively includes: a pre-networker 2, a first feed roller 3, a texturing heating box 4, a water cooler 5, an air cooler 5.5, a false twister 6, a second feed roller 7, a middle networker 8, a setting hot box 9, a third feed roller 10, an oiling roller 11, a fourth feed roller 12, and a DTY winding machine 13;

[0052] As Figures 2 to 4 shown, the texturing heating box 4 includes a tube body 4.1, an upper end cover 4.10, a lower end cover, an air flow baffle 4.4, side plates, a ventilation pipe 4.2, and a heating fan;

[0053] As Figure 2 , Figure 3 shown, the tube body 4.1 is vertically arranged with a height of 500 - 600 mm. Its cross-section is an oblong shape, which consists of two semi-circles with a diameter of 20 - 30 mm and a line segment with a length of 10 - 15 mm connecting the two semi-circles. The number of vertical symmetry planes of the tube body 4.1 is 2, which are respectively denoted as vertical symmetry plane a and vertical symmetry plane b. Vertical symmetry plane a passes through the two farthest points on the oblong shape, vertical symmetry plane a is parallel to the left-right direction, and vertical symmetry plane b is parallel to the front-back direction;

[0054] The upper end of the tube body 4.1 is covered by the upper end cover 4.10, and the lower end is covered by the lower end cover;

[0055] The air flow baffle 4.4 is vertically arranged inside the tube body 4.1 and does not contact the tube body 4.1. The cross-section of the air flow baffle 4.4 is a circular arc with a notch facing right, the central angle of the circular arc is 150 - 180°, and the diameter of the circle corresponding to the circular arc is 8 - 10 mm;

[0056] The upper end of the air flow baffle 4.4 is in contact with the upper end cover 4.10, and the lower end is in contact with the lower end cover; the vertical symmetry plane of the air flow baffle 4.4 is coplanar with the vertical symmetry plane a of the pipe body 4.1, and the central axis of the air flow baffle 4.4 is located on the vertical symmetry plane b of the pipe body 4.1;

[0057] Two long strip-shaped air inlets 4.3 are provided on the pipe body 4.1. The width direction of the air inlets 4.3 is parallel to the vertical direction, and the width is 480 - 580 mm;

[0058] Both of the two air inlets 4.3 are located on the left side of the air flow baffle 4.4 and are symmetrically distributed along the vertical symmetry plane a of the pipe body 4.1; the air inlet directions of the two air inlets 4.3 both face the air flow baffle 4.4 and form an angle of 10 - 15° with the vertical symmetry plane a of the pipe body 4.1. After the air enters from the two air inlets 4.3, it gradually moves away from the vertical symmetry plane a of the pipe body 4.1;

[0059] As Figure 3 、 Figure 4 shown, 20 - 25 rectifying holes 4.6 are provided on the pipe body 4.1. All the rectifying holes 4.6 are arranged in sequence from top to bottom on the right side of the air flow baffle 4.4;

[0060] All the rectifying holes 4.6 are frustum-shaped, with the large end on the left and the small end on the right. The diameter of the large end is twice that of the small end; the diameter of the small end of the rectifying hole 4.6 at the uppermost position is 1 - 2 mm. Among two adjacent rectifying holes 4.6, the diameter of the small end of the rectifying hole 4.6 at the upper position is 1.1 times that of the small end of the rectifying hole 4.6 at the lower position; the central axes of all the rectifying holes 4.6 are located on the vertical symmetry plane a of the pipe body 4.1;

[0061] A tow inlet 4.12 is provided on the upper end cover 4.10, and a tow outlet is provided on the lower end cover. The tow outlet is located directly below the tow inlet 4.12; the central axis of the tow inlet 4.12 coincides with the central axis of the air flow baffle 4.4;

[0062] The side plate and the right end of the pipe body 4.1 enclose an exhaust chamber 4.7. An exhaust port for communicating with an exhaust fan is provided at the right end of the exhaust chamber 4.7;

[0063] One end of the ventilation pipe 4.2 is connected to a heating fan, and the other end is connected to the two air inlets 4.3;

[0064] As Figure 9 shown, the water cooler 5 includes an adjusting rod 5.1, a wire guiding wheel 5.2 and a water tank 5.4; the adjusting rod 5.1 is arranged vertically, and the wire guiding wheel 5.2 is located at the lower end of the adjusting rod 5.1 and is simultaneously located in the water tank 5.4.

[0065] Embodiment 1

[0066] A preparation method of highly profiled polyester textured yarn, using the above-mentioned preparation device for highly profiled polyester textured yarn, and the technological process is as follows: POY raw yarn → pre-network → first feed roller → texturing heating → cooling → false twisting → second feed roller → middle network → third feed roller → oiling → fourth feed roller → winding and forming;

[0067] Among them, the height of the pipe body is 500 mm, the diameter of the semi-circle is 20 mm, the length of the line segment is 10 mm, the central angle of the arc is 150°, the diameter of the circle corresponding to the arc is 8 mm, the width of the air inlet is 480 mm, the included angle between the air inlet direction and the vertical symmetry plane a of the pipe body is 10°, the number of rectifying holes is 20, and the small end diameter of the rectifying hole at the uppermost part is 2 mm;

[0068] Relevant process parameters: The specification of the POY raw yarn is 24 dtex / 72F, the pre-network air pressure is 0.03 MPa, the draft ratio of the first feed roller is 1.56, the blowing temperature is 165 °C, the blowing speed of the heating fan is 3 m / s, the frequency of the oil fume machine is 25 Hz, the false twist ratio is 1.72, the speed of the second roller is 500 m / min, the overfeed rate of the second feed roller is -5%, the middle network air pressure is 0.07 MPa, the overfeed rate of the third feed roller is -5%, the rotational speed of the oiling gear is 0.2 rpm, the overfeed rate of the fourth feed roller is -6.8%, and the overfeed rate of the DTY winding and forming is -3.8%.

[0069] The single filament fineness of the finally prepared highly profiled polyester textured yarn is 0.22 dtex, the cross-section is in the shape of a rich character, the elongation at break is 22.43%, the breaking strength is 4.1 cN / dtex, the dyeing M rate is 99.4%, and the profiling degree is 53%.

[0070] Example 2

[0071] A preparation method of highly profiled polyester textured yarn, using the above-mentioned preparation device for highly profiled polyester textured yarn, and the technological process is as follows: POY raw yarn → pre-network → first feed roller → texturing heating → cooling → false twisting → second feed roller → middle network → third feed roller → oiling → fourth feed roller → winding and forming;

[0072] Among them, the height of the pipe body is 500 mm, the diameter of the semi-circle is 20 mm, the length of the line segment is 10 mm, the central angle of the arc is 150°, the diameter of the circle corresponding to the arc is 8 mm, the width of the air inlet is 480 mm, the included angle between the air inlet direction and the vertical symmetry plane a of the pipe body is 10°, the number of rectifying holes is 20, and the small end diameter of the rectifying hole at the uppermost part is 2 mm;

[0073] Relevant process parameters: The POY raw yarn specification is 33 dtex / 96F, the pre-network air pressure is 0.035 MPa, the draft ratio of the first feed roller is 1.55, the blowing temperature is 166 °C, the blowing speed of the heating fan is 3.2 m / s, the frequency of the oil fume exhaust fan is 30 Hz, the false twist ratio is 1.6, the speed of the second roller is 520 m / min, the overfeed rate of the second feed roller is -4.5%, the medium-network air pressure is 0.075 MPa, the overfeed rate of the third feed roller is -3.5%, the rotational speed of the oiling gear is 0.3 rpm, the overfeed rate of the fourth feed roller is -5.5%, and the overfeed rate of DTY winding and forming is -3.5%.

[0074] The single filament fineness of the finally obtained high-profile polyester textured yarn is 0.23 dtex, the cross-section is caterpillar-shaped, the elongation at break is 23.85%, the breaking strength is 4.14 cN / dtex, the dyeing M rate is 99.1%, and the profile degree is 52%.

[0075] Example 3

[0076] A preparation method of high-profile polyester textured yarn, using the above-mentioned preparation device for high-profile polyester textured yarn, and the process flow is: POY raw yarn → pre-network → first feed roller → texturing heating → cooling → false twist → second feed roller → medium-network → third feed roller → oiling → fourth feed roller → winding and forming;

[0077] Among them, the height of the pipe body is 550 mm, the diameter of the semi-circle is 25 mm, the length of the line segment is 12 mm, the central angle of the circular arc is 160°, the diameter of the circle corresponding to the circular arc is 9 mm, the width of the air inlet is 530 mm, the included angle between the air inlet direction and the vertical symmetry plane a of the pipe body is 12°, the number of rectifying holes is 22, and the small end diameter of the rectifying hole at the uppermost part is 1.5 mm;

[0078] Relevant process parameters: The POY raw yarn specification is 25 dtex / 48F, the pre-network air pressure is 0.04 MPa, the draft ratio of the first feed roller is 1.59, the blowing temperature is 168 °C, the blowing speed of the heating fan is 3.5 m / s, the frequency of the oil fume exhaust fan is 35 Hz, the false twist ratio is 1.76, the speed of the second roller is 600 m / min, the overfeed rate of the second feed roller is -5.5%, the medium-network air pressure is 0.085 MPa, the overfeed rate of the third feed roller is -4.5%, the rotational speed of the oiling gear is 0.2 rpm, the overfeed rate of the fourth feed roller is -7%, and the overfeed rate of DTY winding and forming is -4%.

[0079] The single filament fineness of the finally obtained high-profile polyester textured yarn is 0.33 dtex, the cross-section is rich-character-shaped, the elongation at break is 23.64%, the breaking strength is 4.05 cN / dtex, the dyeing M rate is 98.8%, and the profile degree is 54%.

[0080] Example 4

[0081] A preparation method of high-profile polyester drawn textured yarn, using the above-mentioned preparation device for high-profile polyester drawn textured yarn, and the process flow is: POY raw yarn → pre-network → first feed roller → texturing heating → cooling → false twist → second feed roller → middle network → third feed roller → oiling → fourth feed roller → winding and forming;

[0082] Among them, the height of the pipe body is 550 mm, the diameter of the semi-circle is 25 mm, the length of the line segment is 12 mm, the central angle of the circular arc is 160°, the diameter of the circle corresponding to the circular arc is 9 mm, the width of the air inlet is 530 mm, the included angle between the air inlet direction and the vertical symmetry plane a of the pipe body is 12°, the number of rectifying holes is 22, and the small end diameter of the rectifying hole at the uppermost part is 1.5 mm;

[0083] Relevant process parameters: The POY raw yarn specification is 40 dtex / 72F, the pre-network air pressure is 0.035 MPa, the draft ratio of the first feed roller is 1.62, the blowing temperature is 170 °C, the blowing speed of the heating fan is 4 m / s, the frequency of the oil fume machine is 38 Hz, the false twist ratio is 1.8, the speed of the second roller is 550 m / min, the overfeed rate of the second feed roller is -5.5%, the middle network air pressure is 0.08 MPa, the overfeed rate of the third feed roller is -3%, the rotational speed of the oiling gear is 0.32 rpm, the overfeed rate of the fourth feed roller is -4.2%, and the overfeed rate of DTY winding and forming is -2.5%.

[0084] The single filament fineness of the finally obtained high-profile polyester drawn textured yarn is 0.39 dtex, the cross-section is king-shaped, the breaking elongation rate is 22.59%, the breaking strength is 4.18 cN / dtex, the dyeing M rate is 99.3%, and the profile degree is 52%.

[0085] Example 5

[0086] A preparation method of high-profile polyester drawn textured yarn, using the above-mentioned preparation device for high-profile polyester drawn textured yarn, and the process flow is: POY raw yarn → pre-network → first feed roller → texturing heating → cooling → false twist → second feed roller → middle network → third feed roller → oiling → fourth feed roller → winding and forming;

[0087] Among them, the height of the pipe body is 570 mm, the diameter of the semi-circle is 26 mm, the length of the line segment is 13 mm, the central angle of the circular arc is 170°, the diameter of the circle corresponding to the circular arc is 9.5 mm, the width of the air inlet is 560 mm, the included angle between the air inlet direction and the vertical symmetry plane a of the pipe body is 13°, the number of rectifying holes is 23, and the small end diameter of the rectifying hole at the uppermost part is 1.3 mm;

[0088] Relevant process parameters: The POY raw yarn specification is 42 dtex / 72F, the pre-network air pressure is 0.04 MPa, the draw ratio of the first feed roller is 1.61, the blowing temperature is 172 °C, the blowing speed of the heating fan is 4.5 m / s, the frequency of the oil fume extractor is 40 Hz, the false twist ratio is 1.74, the speed of the second roller is 580 m / min, the overfeed rate of the second feed roller is -5%, the medium-network air pressure is 0.09 MPa, the overfeed rate of the third feed roller is -4%, the rotational speed of the oiling gear is 0.35 rpm, the overfeed rate of the fourth feed roller is -6%, and the overfeed rate of DTY winding forming is -4%.

[0089] The single filament fineness of the finally obtained high-profile polyester drawn textured yarn is 0.42 dtex, the cross-section is hollow, the elongation at break is 23.03%, the breaking strength is 4.2 cN / dtex, the dyeing M rate is 99.2%, and the profile degree is 55%.

[0090] Example 6

[0091] A preparation method of high-profile polyester drawn textured yarn, using the above-mentioned preparation device for high-profile polyester drawn textured yarn, and the process flow is: POY raw yarn → pre-network → first feed roller → texturing heating → cooling → false twist → second feed roller → medium-network → third feed roller → oiling → fourth feed roller → winding forming;

[0092] Among them, the height of the pipe body is 600 mm, the diameter of the semi-circle is 30 mm, the length of the line segment is 15 mm, the central angle of the arc is 180°, the diameter of the circle corresponding to the arc is 10 mm, the width of the air inlet is 580 mm, the included angle between the air inlet direction and the vertical symmetry plane a of the pipe body is 15°, the number of rectifying holes is 25, and the small end diameter of the rectifying hole at the uppermost part is 1 mm;

[0093] Relevant process parameters: The POY raw yarn specification is 82 dtex / 96F, the pre-network air pressure is 0.045 MPa, the draw ratio of the first feed roller is 1.63, the blowing temperature is 177 °C, the blowing speed of the heating fan is 5 m / s, the frequency of the oil fume extractor is 45 Hz, the false twist ratio is 1.78, the speed of the second roller is 620 m / min, the overfeed rate of the second feed roller is -5.5%, the medium-network air pressure is 0.1 MPa, the overfeed rate of the third feed roller is -5.5%, the rotational speed of the oiling gear is 0.4 rpm, the overfeed rate of the fourth feed roller is -6.5%, and the overfeed rate of DTY winding forming is -4%.

[0094] The single filament fineness of the finally obtained high-profile polyester drawn textured yarn is 0.52 dtex, the cross-section is king-shaped, the elongation at break is 21.76%, the breaking strength is 4.24 cN / dtex, the dyeing M rate is 99.5%, and the profile degree is 56%.

[0095] Comparative Example 1

[0096] A method for preparing high-profile polyester textured yarn is basically the same as that in Example 6, except that: in the preparation device of the high-profile polyester textured yarn used in this comparative example, the texturing heating box is as shown in Figure 5 the texturing heating box shown.

[0097] The elongation at break of the finally prepared high-profile polyester textured yarn is 19.9%, the breaking strength is 3.88 cN / dtex, and the dyeing M rate is 93.3%.

[0098] Compared with Example 6, the elongation at break, breaking strength and dyeing M rate of the high-profile polyester textured yarn in Comparative Example 1 are all worse; this is because in Comparative Example 1, the hot air in the heating box blows from bottom to top, which is opposite to the running direction of the filament. Since the specific surface area of the king-shaped filament is relatively large, the hot air generates greater frictional force on the filament running at high speed, resulting in too high surface tension of the filament. This high tension not only easily causes filament breakage or uneven heating of single filaments (the outer filaments are heated more and the inner filaments are heated less), resulting in a large temperature difference between the inner and outer single filaments, but also ultimately leads to a decrease in the dyeing M rate in the later stage.

[0099] Comparative Example 2

[0100] A method for preparing high-profile polyester textured yarn is basically the same as that in Example 6, except that: in the preparation device of the high-profile polyester textured yarn used in this comparative example, no air flow baffle is provided in the texturing heating box.

[0101] The elongation at break of the finally prepared high-profile polyester textured yarn is 18.96%, the breaking strength is 3.76 cN / dtex, and the dyeing M rate is 92.5%.

[0102] Compared with Example 6, the elongation at break, breaking strength and dyeing M rate of the high-profile polyester textured yarn in Comparative Example 2 are all worse; this is because in the texturing heating box of Comparative Example 2, the hot air blows directly towards the filament, causing greater disturbance to the filament bundle, thus resulting in a decrease in the elongation at break and breaking strength of the filament; in addition, since the specific surface area of the profiled filament is relatively large, when the hot air blows directly towards the filament, the windward side of the filament is heated more and the leeward side is heated less, resulting in uneven heating of the filament, and further leading to a lower dyeing M rate.

Claims

1. A preparation device for high-profile polyester textured yarn, including a texturing heating box (4), characterized in that, The deformable heating box (4) includes a pipe body (4.1), an upper end cover (4.10), a lower end cover, an air flow baffle (4.4), a ventilation pipe (4.2) and a heating fan; The pipe body (4.1) is vertically arranged, with the upper end covered by the upper end cover (4.10) and the lower end covered by the lower end cover; The air flow baffle (4.4) is located inside the pipe body (4.1) and does not contact the pipe body (4.1); the air flow baffle (4.4) is vertically arranged and has a circular arc-shaped cross-section, with the notch of the circular arc facing right; the upper end of the air flow baffle (4.4) fits with the upper end cover (4.10), and the lower end fits with the lower end cover; There are two front and rear air inlets (4.3) on the pipe body (4.1), both of the two air inlets (4.3) are located on the left side of the air flow baffle (4.4) and the air inlet directions are both towards the air flow baffle (4.4); There is a rectifying hole (4.6) on the pipe body (4.1), and the rectifying hole (4.6) is located on the right side of the air flow baffle (4.4); There is a tow bundle inlet (4.12) on the upper end cover (4.10), and a tow bundle outlet on the lower end cover, and the tow bundle outlet is directly below the tow bundle inlet (4.12); One end of the ventilation pipe (4.2) is connected to the heating fan, and the other end is connected to the two air inlets (4.3); The cooperation of each component enables the tow bundle to enter the pipe body (4.1) through the tow bundle inlet (4.12), and is protected by the air flow baffle (4.4) and does not contact the air entering from the two air inlets (4.3).

2. The preparation device of a high-profile polyester elastic yarn according to claim 1, characterized in that, The cross-section of the pipe body (4.1) is oblong, which is composed of two semi-circles and a line segment connecting the two semi-circles. The number of vertical symmetry planes of the pipe body (4.1) is 2, which are respectively denoted as vertical symmetry plane a and vertical symmetry plane b. The vertical symmetry plane a passes through the two farthest points on the oblong. The vertical symmetry plane a is parallel to the left and right directions, and the vertical symmetry plane b is parallel to the front and back directions; The vertical symmetry plane of the air flow baffle (4.4) is coplanar with the vertical symmetry plane a of the pipe body (4.1), and the central axis of the air flow baffle (4.4) is located on the vertical symmetry plane b of the pipe body (4.1); The central axis of the tow bundle inlet (4.12) coincides with the central axis of the air flow baffle (4.4); The two air inlets (4.3) are symmetrically distributed along the vertical symmetry plane a of the pipe body (4.1).

3. The preparation device of a high-profile polyester elastic yarn according to claim 2, characterized in that, The diameter of the semi-circle is 20 - 30 mm, and the length of the line segment is 10 - 15 mm; the central angle of the circular arc is 150 - 180°, and the diameter of the circle corresponding to the circular arc is 8 - 10 mm.

4. The manufacturing apparatus of a high-profile polyester textured yarn according to claim 3, characterized in that, The air inlet directions of the two air inlets (4.3) form an angle of 10 - 15° with the vertical symmetry plane a of the pipe body (4.1), and the air gradually moves away from the vertical symmetry plane a of the pipe body (4.1) after entering from the two air inlets (4.3).

5. The manufacturing apparatus of a high-profile polyester elastic yarn according to claim 3, characterized in that, The two air inlets (4.3) are strip-shaped, with the width direction parallel to the vertical direction, and the width is 480 - 580 mm; the height of the pipe body (4.1) is 500 - 600 mm.

6. The preparation device of a high-profile polyester elastic yarn according to claim 2, characterized in that, The number of the rectifying holes (4.6) is multiple, and they are arranged in sequence from top to bottom. All the rectifying holes (4.6) are frustum-shaped, with the large end on the left and the small end on the right. The central axes of all the rectifying holes (4.6) are located on the vertical symmetry plane a of the pipe body (4.1).

7. The manufacturing apparatus of a high-profile polyester elastic yarn according to claim 6, characterized in that, The large end diameter of all the rectifying holes (4.6) is twice the small end diameter; the small end diameter of the uppermost rectifying hole (4.6) is 1 - 2 mm, and for two adjacent rectifying holes (4.6), the small end diameter of the upper rectifying hole (4.6) is 1.1 times that of the lower rectifying hole (4.6).

8. The preparation device of a highly profiled polyester elastic yarn according to claim 1, characterized in that The deformed heating box (4) further includes side plates, and the side plates and the right end of the pipe body (4.1) enclose a smoke exhaust chamber (4.7), and a smoke exhaust port for communicating with a smoke exhaust machine is provided at the right end of the smoke exhaust chamber (4.7).

9. The manufacturing apparatus of a highly profiled polyester elastic yarn according to claim 1, characterized in that, The preparation device for highly profiled polyester drawn textured yarn further includes a water cooler (5); on the running path of the tow, the water cooler (5) is located in front of the deformed heating box (4); the water cooler (5) includes an adjusting rod (5.1), a wire guiding wheel (5.2) and a water tank (5.4); the adjusting rod (5.1) is arranged vertically, the wire guiding wheel (5.2) is located at the lower end of the adjusting rod (5.1) and is simultaneously located in the water tank (5.4).

10. A preparation method of high-profile polyester elastic yarn, characterized in that, When using the preparation device for highly profiled polyester drawn textured yarn according to any one of claims 1 - 9, the single filament fineness of the highly profiled polyester drawn textured yarn is ≤ 0.55 dtex, the cross-section is in the shape of a rich character, a king character, a caterpillar or a hollow shape, the breaking elongation is 21.76 - 23.85%, the breaking strength is 4.05 - 4.24 cN / dtex, the dyeing M rate is 98.8 - 99.5%, and the profile degree is more than 50%.

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