High-profile-degree polyester stretch yarn preparation device and method

Abstract

The invention belongs to the field of spinning equipment, and relates to a high-profile-degree polyester stretch yarn preparation device and method.The device comprises a deformation heating box, and the deformation heating box comprises a pipe body, an upper end cover, a lower end cover, an airflow baffle, a ventilation pipe and a heating fan; the pipe body is vertically arranged, and the airflow baffle is located in the pipe body and does not make contact with the pipe body. The airflow baffle is vertically arranged, the cross section of the airflow baffle is arc-shaped, and a notch of the arc is rightward; air inlets and rectification holes are formed in the pipe body, one end of the ventilation pipe is connected with the heating fan, and the other end is connected with the two air inlets; all the components are matched with one another, so that tows enter the pipe body through the tow inlet, are protected by the airflow baffle and do not make contact with air entering from the two air inlets. According to the method, the device is used for spinning the high-profile-degree polyester stretch yarn. According to the invention, uniform heating and cooling of filaments can be ensured, so that the filaments keep high profile degree, and dyeing is more uniform.

Description

Technical Field

[0001] The invention belongs to the technical field of polyester production, and particularly relates to a device and method for preparing highly profiled polyester stretch yarn. Background Art

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

[0003] At present, polyester filament POY is generally made into elastic yarn through false twisting to obtain good fluffy performance. In this process, uniform heating of the yarn during twisting is crucial. However, high profile yarn is extremely sensitive to temperature and friction of the yarn path due to its special cross-section, high profile and large specific surface area. If the blowing temperature or friction is uneven during heating, it is very easy to cause yarn tension fluctuation and uneven heating. Therefore, when heating this type of yarn, it is necessary to ensure that the heating temperature at each point is uniform, and avoid contact between the yarn path and the yarn to prevent the oil from volatilizing and generating dirt, which will increase the friction of the yarn and cause single yarn breakage or tension fluctuation.

[0004] There are many kinds of heating boxes in the prior art, and each heating box has its own disadvantages:

[0005] A heating box disclosed in the patent with publication number CN117947552A: Figure 5 As shown in the figure, the heating air of the heating box is parallel to the running direction of the wire strip, which reduces the disturbance of the hot air to the wire strip to a certain extent. However, the heating air blows from bottom to top, which is opposite to the running direction of the wire strip. The heating effect is acceptable for round hole wire. However, for caterpillar and Feng-shaped wires with high degree of special shape, the high-speed running wire strips are opposite to the heating air. Because the special-shaped wire has a large specific surface area, it is similar to the green train running against the wind (compared with round wires such as bullet trains running against the wind, the wind resistance is greater). The friction generated by the heating air is greater, resulting in excessive surface tension of the wire strip, which is easy to break, or the heating difference of the single wire is large, the outer layer of the wire is heated more, and the inner layer of the wire is heated less, resulting in a large temperature difference between the inner and outer layers of the single wire, which ultimately leads to uneven dyeing in the later stage.

[0006] The heating box where the wire strip is heated in contact with the heating box: Figure 6 As shown, under this heating method, the oil in the wire strip evaporates at high temperature and forms scale, which adheres to the inside of the heat box, hindering the heat transfer between the wire strip and the heat box, causing the wire strip to be heated unevenly.

[0007] Hot air heating box: Figure 7 As shown in the figure, the heating box uses hot air for heating, and the wire strips do not come into direct contact with the heating box, so the friction is greatly reduced and the wire strips are less likely to break. However, the negative pressure generated by the fume extraction will cause turbulence in the air in the heating box, and the wire strips will be significantly disturbed; if the fume fan is turned off, a large amount of fume will gather in the heating box to form droplets, which will pollute the wire strips.

[0008] Heating air cylinder with rectifying holes: Figure 8 As shown in the figure, the side wall of the wind tube is provided with a rectifying hole, and the inner wall is surrounded by a cavity. The hot air blows into the cavity through the rectifying hole to heat the wire strip, and the heating efficiency is high and the wire strip is heated evenly. Figure 5 , Figure 8 In the technology used, the disturbance of the wire during heating is more significant.

[0009] The above-mentioned problems in the prior art are extremely unfavorable to the production of high-profile elastic yarn, and there is no effective solution at present. Therefore, it is urgent to develop a deformation heating box that can ensure uniform heating of the yarn and reduce the disturbance of the hot air to the yarn. Summary of the invention

[0010] 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 high-profile polyester stretch yarn.

[0011] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0012] A preparation device for highly profiled polyester stretch yarn, comprising a deformation heating box, wherein the deformation heating box comprises a tube body, an upper end cover, a lower end cover, an air flow baffle, a ventilation pipe and a heating fan;

[0013] The tube body is arranged vertically, with the upper end covered by an upper end cover and the lower end covered by a lower end cover;

[0014] The airflow baffle is located in the tube body and does not contact the tube body; the airflow baffle is arranged vertically and has an arc-shaped cross section, with the arc-shaped notch facing right; the upper end of the airflow baffle is in contact with the upper end cover, and the lower end is in contact with the lower end cover;

[0015] The tube body is provided with two front and rear air inlets, both of which are located on the left side of the air flow baffle and the air inlet direction is toward the air flow baffle;

[0016] The tube body is provided with a rectifying hole, which is located on the right side of the air flow baffle;

[0017] The upper end cover is provided with a tow inlet, and the lower end cover is provided with a tow outlet, and the tow outlet is located directly below the tow inlet;

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

[0019] The various components cooperate with each other so that the filament bundle enters the tube body through the filament bundle inlet and is protected by the air flow baffle so as not to be in contact with the wind entering from the two air inlets.

[0020] As the preferred technical solution:

[0021] The device for preparing a highly profiled polyester stretch yarn as described above has a cross-section of an oblong body, the oblong body is composed of two semicircles and a line segment connecting the two semicircles, the number of vertical symmetry planes of the tube body is 2, which are respectively recorded as vertical symmetry plane a and vertical symmetry plane b, the vertical symmetry plane a passes through the two points on the oblong body that are farthest apart, 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 tube body, and the central axis of the air flow baffle (the air flow baffle is equivalent to a part cut from the 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 tube body;

[0023] The central axis of the tow 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 tube body.

[0025] In the above-mentioned device for preparing highly profiled polyester stretch yarn, the diameter of the semicircle is 20-30 mm, 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] In the device for preparing highly profiled polyester stretch yarn as described above, the air inlet directions of the two air inlets are at an angle of 10 to 15 degrees to the vertical symmetry plane a of the tube body. After the wind enters from the two air inlets, it gradually moves away from the vertical symmetry plane a of the tube body. Such a design can reduce wind resistance and avoid the formation of turbulence. If the angle is too small, the wind resistance is large. If the angle is too large, too much wind will flow to the inner wall of the tube body and cannot flow along the air flow baffle, resulting in low heating efficiency.

[0027] In the above-mentioned device for preparing highly profiled polyester stretch yarn, the two air inlets are in the shape of long strips, the width direction of which is parallel to the vertical direction and the width is 480-580 mm; the height of the tube body is 500-600 mm.

[0028] As described above, a preparation device for a highly profiled polyester stretch yarn has a plurality of rectifying holes arranged in sequence from top to bottom, and all rectifying holes are truncated cone-shaped, with the large end on the left and the small end on the right, so that the hot air can be gathered on the inner wall, and the wind pressure on the inner wall is greater than that on the outer wall, which is beneficial to the stability of the hot air rectification and prevents turbulence from forming at the rectifying holes, causing pressure fluctuations in the tube body, and the central axes of all the rectifying holes are located on the vertical symmetry plane a of the tube body.

[0029] In the above-mentioned preparation device for highly profiled polyester elastic yarn, the large end diameters of all the rectifying holes are twice the small end diameters; the small end diameter of the rectifying hole located at the top is 1-2 mm, and among two adjacent rectifying holes, the small end diameter of the rectifying hole located at the top is 1.1 times the small end diameter of the rectifying hole located at the bottom. Such a design allows the axial wind speed of the heating air to decrease from top to bottom under the negative pressure of the range hood. This is mainly because the heat required for the filaments in the initial stage of heating is large, and the heat required at the end is small, and the filaments are already in a vitrified state at the end, and the wind pressure in the heating chamber should be small to reduce the shaking of the filaments.

[0030] In the above-mentioned device for preparing highly profiled polyester elastic yarn, the deformation heating box also includes a side plate, which and the right end of the tube body form a smoke exhaust chamber, and the right end of the smoke exhaust chamber is provided with a smoke exhaust port for connecting to a smoke exhaust machine.

[0031] As described above, a preparation device for a high-profile polyester stretch yarn also includes a water cooler; on the yarn bundle running path, the water cooler is located in front of the deformation heating box, and after water cooling, the yarn is dehydrated by air cooling and further evenly cooled; the water cooler includes an adjusting rod, a wire guide wheel and a water tank; the adjusting rod is arranged vertically, the wire guide wheel is located at the lower end of the adjusting rod and is also located in the water tank; the water tank is filled with alkaline water, the alkaline water concentration is 50~60wt%, and the alkaline water temperature is 20~30℃.

[0032] The present invention also provides a method for preparing high-profile polyester stretch yarn, using a preparation device for high-profile polyester stretch yarn as described in any of the above items, the single yarn fineness of the high-profile polyester stretch yarn is ≤0.55dtex, the cross-section is a Feng-shaped, Wang-shaped, caterpillar-shaped or hollow-shaped, the elongation at break is 21.76~23.85%, the breaking strength is 4.05~4.24cN / dtex, the dyeing M rate is 98.8~99.5%, and the profile is above 50%.

[0033] Beneficial effects:

[0034] The heating device of the present invention is designed with an air flow baffle to block the filament bundle based on the characteristics of high-profile yarn, which has a large specific surface area and a strong heat exchange capacity. At the same time, the heating air forms a circulation around the filament bundle according to the principle of winding around a cylinder, and the heating air does not blow directly onto the filaments. This design increases the heat exchange speed, which not only ensures that the filaments are heated evenly, but also avoids direct contact between the hot air and the filament bundle and causing disturbance to the filament bundle, while improving the heating efficiency of the high-profile yarn.

[0035] The invention can ensure that the wire strips are heated and cooled uniformly, so that the wire strips maintain a high degree of special shape and are dyed more uniformly. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1The present invention is a flow chart of the preparation of high profile polyester stretch yarn;

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

[0038] Figure 3 A schematic diagram of the horizontal cross-section structure of a deformation heating box of the present invention, wherein the heating fan is not shown in the figure, and the direction of the arrow is the direction of air flow;

[0039] Figure 4 It is a schematic diagram of the arrangement of the rectifying holes on the tube body in the present invention;

[0040] Figure 5 It is a schematic diagram of a wire strip passing through a heat box for axial heating and deformation in the prior art;

[0041] Figure 6 It is a schematic diagram of a wire strip passing through a contact deformation heating box of the prior art;

[0042] Figure 7 A schematic diagram of a wire strip passing through a non-contact deformation heating box of the prior art;

[0043] Figure 8 A schematic diagram of a wire strip passing through a ring-shaped blowing cylinder of a deformation heating box in the prior art;

[0044] Fig. 9 A schematic diagram of a wire strip passing through a water cooler of the present invention;

[0045] In the figure, 1-POY raw yarn, 2-pre-network device, 3-first wire feeding roller, 4-deformation heating box, 4.1-tube body, 4.2-ventilation pipe, 4.3-air inlet, 4.4-air flow baffle, 4.6-rectifier hole, 4.7-smoke exhaust chamber, 4.10-upper end cover, 4.12-tow inlet, 5-water cooler, 5.1-adjusting rod, 5.2-wire guide wheel, 5.4-water tank, 5.5-air cooler, 6-false twister, 7-second wire feeding roller, 8-middle network device, 9-setting hot box, 10-third wire feeding roller, 11-upper oil wheel, 12-fourth wire feeding roller, 13-DTY winding machine. DETAILED DESCRIPTION

[0046] 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.

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

[0048] Breaking strength and elongation at break: The test was conducted in accordance with the standard GB / T 14460-2015 Polyester Low-Stretch Yarn DTY. 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. The breaking strength and elongation at break of the sample were obtained from the data display.

[0049] Dyeing M rate: Tested with reference to the standard "GB / T 14460-2015 Polyester Low-elastic Yarn DTY", the proportion of yarns with dyeing uniformity gray card reaching 4.0 and above to all dyed DTY yarns was calculated to obtain the dyeing M rate.

[0050] Shape degree: Tested in accordance with the standard "FZ / T 50002-2013 Test method for chemical fiber shape degree".

[0051] The device used in Examples 1 to 6 for preparing highly profiled polyester stretch yarn is as follows: Figure 1 As shown, the tow running path of the POY raw yarn 1 includes: a pre-netting device 2, a first feeding roller 3, a deformation heating box 4, a water cooler 5, an air cooler 5.5, a false twister 6, a second feeding roller 7, a middle netting device 8, a shaping hot box 9, a third feeding roller 10, an oiling wheel 11, a fourth feeding roller 12, and a DTY winding machine 13;

[0052] like Figure 2~Figure 4 As shown, the deformation 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, a side plate, a ventilation pipe 4.2 and a heating fan;

[0053] like Figure 2 , Figure 3 As shown, the tube body 4.1 is arranged vertically, with a height of 500-600 mm, and a cross section of the tube body 4.1 is an oblong shape, which is composed of two semicircles with a diameter of 20-30 mm and a line segment with a length of 10-15 mm connecting the two semicircles; the number of vertical symmetry planes of the tube body 4.1 is 2, which are respectively recorded as vertical symmetry plane a and vertical symmetry plane b, and the vertical symmetry plane a passes through the two points on the oblong shape that are farthest apart, and 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;

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

[0055] The airflow baffle 4.4 is vertically arranged in the tube body 4.1 and does not contact the tube body 4.1. The cross section of the airflow baffle 4.4 is an arc shape with the notch facing right. The center angle of the arc shape is 150-180°, and the diameter of the circle corresponding to the arc shape is 8-10 mm.

[0056] The upper end of the airflow 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 airflow baffle 4.4 is coplanar with the vertical symmetry plane a of the tube body 4.1, and the central axis of the airflow baffle 4.4 is located on the vertical symmetry plane b of the tube body 4.1;

[0057] The tube body 4.1 is provided with two long strip air inlets 4.3, the width direction of the air inlets 4.3 is parallel to the vertical direction, and the width is 480-580 mm;

[0058] The two air inlets 4.3 are both located on the left side of the air flow baffle 4.4 and are symmetrically distributed along the vertical symmetry plane a of the tube body 4.1; the air inlet directions of the two air inlets 4.3 are both toward the air flow baffle 4.4 and form an angle of 10 to 15 degrees with the vertical symmetry plane a of the tube body 4.1. After entering from the two air inlets 4.3, the wind gradually moves away from the vertical symmetry plane a of the tube body 4.1;

[0059] like Figure 3 , Figure 4 As shown, the tube body 4.1 is provided with 20 to 25 rectifying holes 4.6, and all 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 truncated cone-shaped, with the large end on the left and the small end on the right, and the diameter of the large end is twice the diameter of the small end; the diameter of the small end of the rectifying hole 4.6 located at the top is 1-2 mm, and of two adjacent rectifying holes 4.6, the diameter of the small end of the rectifying hole 4.6 located at the top is 1.1 times the diameter of the small end of the rectifying hole 4.6 located at the bottom; the central axes of all the rectifying holes 4.6 are located on the vertical symmetry plane a of the tube body 4.1;

[0061] The upper end cover 4.10 is provided with a tow inlet 4.12, and the lower end cover is provided with a tow outlet, which 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 airflow baffle 4.4;

[0062] The side plate and the right end of the tube body 4.1 form 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;

[0063] 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;

[0064] like Fig. 9 As shown, the water cooler 5 comprises an adjusting rod 5.1, a wire guide wheel 5.2 and a water tank 5.4; the adjusting rod 5.1 is arranged vertically, and the wire guide wheel 5.2 is located at the lower end of the adjusting rod 5.1 and is also located in the water tank 5.4.

[0065] Example 1

[0066] A method for preparing high-profile polyester stretch yarn, using the above-mentioned high-profile polyester stretch yarn preparation device, the process flow is: POY raw yarn → pre-interlacing → first feeding roller → deformation heating → cooling → false twisting → second feeding roller → middle interlacing → third feeding roller → oiling → fourth feeding roller → winding and forming;

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

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

[0069] The final high-profile polyester stretch yarn has a single yarn fineness of 0.22dtex, a Feng-shaped cross-section, an elongation at break of 22.43%, a breaking strength of 4.1cN / dtex, a dyeing M rate of 99.4%, and a profile of 53%.

[0070] Example 2

[0071] A method for preparing high-profile polyester stretch yarn, using the above-mentioned high-profile polyester stretch yarn preparation device, the process flow is: POY raw yarn → pre-interlacing → first feeding roller → deformation heating → cooling → false twisting → second feeding roller → middle interlacing → third feeding roller → oiling → fourth feeding roller → winding and forming;

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

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

[0074] The final highly profiled polyester stretch yarn has a single yarn fineness of 0.23dtex, a caterpillar-shaped cross-section, an elongation at break of 23.85%, a breaking strength of 4.14cN / dtex, a dyeing M rate of 99.1%, and a profile of 52%.

[0075] Example 3

[0076] A method for preparing high-profile polyester stretch yarn, using the above-mentioned high-profile polyester stretch yarn preparation device, the process flow is: POY raw yarn → pre-interlacing → first feeding roller → deformation heating → cooling → false twisting → second feeding roller → middle interlacing → third feeding roller → oiling → fourth feeding roller → winding and forming;

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

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

[0079] The final high-profile polyester stretch yarn has a single yarn fineness of 0.33dtex, a Feng-shaped cross-section, an elongation at break of 23.64%, a breaking strength of 4.05cN / dtex, a dyeing M rate of 98.8%, and a profile of 54%.

[0080] Example 4

[0081] A method for preparing high-profile polyester stretch yarn, using the above-mentioned high-profile polyester stretch yarn preparation device, the process flow is: POY raw yarn → pre-interlacing → first feeding roller → deformation heating → cooling → false twisting → second feeding roller → middle interlacing → third feeding roller → oiling → fourth feeding roller → winding and forming;

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

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

[0084] The final high-profile polyester stretch yarn has a single yarn fineness of 0.39 dtex, a W-shaped cross-section, an elongation at break of 22.59%, a breaking strength of 4.18 cN / dtex, a dyeing M rate of 99.3%, and a profile of 52%.

[0085] Example 5

[0086] A method for preparing high-profile polyester stretch yarn, using the above-mentioned high-profile polyester stretch yarn preparation device, the process flow is: POY raw yarn → pre-interlacing → first feeding roller → deformation heating → cooling → false twisting → second feeding roller → middle interlacing → third feeding roller → oiling → fourth feeding roller → winding and forming;

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

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

[0089] The final high-profile polyester stretch yarn has a single yarn fineness of 0.42dtex, a hollow cross-section, an elongation at break of 23.03%, a breaking strength of 4.2cN / dtex, a dyeing M rate of 99.2%, and a profile of 55%.

[0090] Example 6

[0091] A method for preparing high-profile polyester stretch yarn, using the above-mentioned high-profile polyester stretch yarn preparation device, the process flow is: POY raw yarn → pre-interlacing → first feeding roller → deformation heating → cooling → false twisting → second feeding roller → middle interlacing → third feeding roller → oiling → fourth feeding roller → winding and forming;

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

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

[0094] The final high-profile polyester stretch yarn has a single yarn fineness of 0.52dtex, a W-shaped cross-section, an elongation at break of 21.76%, a breaking strength of 4.24cN / dtex, a dyeing M rate of 99.5%, and a profile of 56%.

[0095] Comparative Example 1

[0096] A method for preparing a highly shaped polyester stretch yarn is basically the same as that in Example 6, except that: in the preparation device for the highly shaped polyester stretch yarn used in this comparative example, the deformation heating box is as follows Figure 5 Deformed heating box shown.

[0097] The final high-profile polyester stretch yarn has an elongation at break of 19.9%, a breaking strength of 3.88 cN / dtex, and a dyeing M rate of 93.3%.

[0098] Compared with Example 6, the elongation at break, breaking strength and dyeing M rate of the high-profile polyester stretch yarn in Comparative Example 1 are all worse; this is because the hot air in the heating box used in Comparative Example 1 blows from bottom to top, which is opposite to the running direction of the yarn, and the Wang-shaped yarn has a larger specific surface area, and the hot air produces a greater friction force on the high-speed running yarn, resulting in excessive surface tension of the yarn. This high tension not only easily causes the yarn to break or the single yarn to be heated unevenly (the outer layer of the yarn is heated more, and the inner layer of the yarn is heated less), resulting in a large temperature difference between the inner and outer layers of the single yarn, but also ultimately leads to a decrease in the M rate of later dyeing.

[0099] Comparative Example 2

[0100] A method for preparing highly profiled polyester stretch yarn is basically the same as that of Example 6, except that in the preparation device for highly profiled polyester stretch yarn used in this comparative example, no air flow baffle is provided in the deformation heating box.

[0101] The final high-profile polyester stretch yarn has an elongation at break of 18.96%, a breaking strength of 3.76 cN / dtex, and a dyeing M rate of 92.5%.

[0102] Compared with Example 6, the elongation at break, breaking strength and dyeing M rate of the high-profile polyester stretch yarn in Comparative Example 2 are all deteriorated; this is because in the deformation heating box of Comparative Example 2, the hot air blows directly onto the yarn, causing a large disturbance to the yarn bundle, thereby resulting in a decrease in the elongation at break and breaking strength of the yarn; in addition, since the specific surface area of ​​the profiled yarn is large, when the hot air blows directly onto the yarn, the windward side of the yarn is heated more, while the leeward side is heated less, resulting in uneven heating of the yarn, which in turn leads to a lower dyeing M rate.

Claims

1. A device for preparing highly profiled polyester stretch yarn, comprising a deformation heating box (4), characterized in that: The deformation heating box (4) comprises a tube 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 tube body (4.1) is arranged vertically, with the upper end covered by an upper end cover (4.10) and the lower end covered by a lower end cover; The airflow baffle (4.4) is located inside the tube body (4.1) and does not contact the tube body (4.1); the airflow baffle (4.4) is arranged vertically and has an arc-shaped cross section, with the arc-shaped notch facing rightward; the upper end of the airflow 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 tube body (4.1) is provided with two front and rear air inlets (4.3), both of which are located on the left side of the air flow baffle (4.4) and the air inlet directions are both toward the air flow baffle (4.4); A rectifying hole (4.6) is provided on the tube body (4.1), and the rectifying hole (4.6) is located on the right side of the airflow baffle (4.4); The upper end cover (4.10) is provided with a fiber bundle inlet (4.12), and the lower end cover is provided with a fiber bundle outlet, and the fiber bundle outlet is located directly below the fiber 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 components cooperate with each other so that the filament bundle enters the tube body (4.1) through the filament bundle inlet (4.12) and is protected by the air flow baffle (4.4) so ​​as not to come into contact with the wind entering from the two air inlets (4.3).

2. The device for preparing highly profiled polyester stretch yarn according to claim 1, characterized in that: The cross section of the tube body (4.1) is an oblong circle, which is composed of two semicircles and a line segment connecting the two semicircles. The number of vertical symmetry planes of the tube body (4.1) is 2, which are respectively recorded as vertical symmetry plane a and vertical symmetry plane b. The vertical symmetry plane a passes through the two points on the oblong circle that are farthest apart. 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. The vertical symmetry plane of the airflow baffle (4.4) is coplanar with the vertical symmetry plane a of the tube body (4.1), and the central axis of the airflow baffle (4.4) is located on the vertical symmetry plane b of the tube body (4.1); The central axis of the tow 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 tube body (4.1).

3. The device for preparing highly profiled polyester stretch yarn according to claim 2, characterized in that: The diameter of the semicircle is 20~30mm, and the length of the line segment is 10~15mm; the central angle of the arc is 150~180°, and the diameter of the circle corresponding to the arc is 8~10mm.

4. The device for preparing highly profiled polyester stretch yarn according to claim 3, characterized in that: The air inlet directions of the two air inlets (4.3) form an angle of 10 to 15 degrees with the vertical symmetry plane a of the tube body (4.1), and the air gradually moves away from the vertical symmetry plane a of the tube body (4.1) after entering from the two air inlets (4.3).

5. The device for preparing highly profiled polyester stretch yarn according to claim 3, characterized in that: The two air inlets (4.3) are in the shape of long strips, with the width direction being parallel to the vertical direction and the width being 480-580 mm; the height of the tube body (4.1) is 500-600 mm.

6. The device for preparing highly profiled polyester stretch yarn according to claim 2, characterized in that: There are a plurality of rectifying holes (4.6) arranged in sequence from top to bottom, and all rectifying holes (4.6) are truncated cone-shaped, with the large end on the left and the small end on the right, and the central axes of all rectifying holes (4.6) are located on the vertical symmetry plane a of the tube body (4.1).

7. The device for preparing highly profiled polyester stretch 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 rectifying hole (4.6) located at the top is 1-2 mm, and of two adjacent rectifying holes (4.6), the small end diameter of the rectifying hole (4.6) located at the top is 1.1 times the small end diameter of the rectifying hole (4.6) located at the bottom.

8. The device for preparing highly profiled polyester stretch yarn according to claim 1, characterized in that: The deformation heating box (4) further comprises a side plate, which together with the right end of the tube body (4.1) form a smoke exhaust chamber (4.7), and the right end of the smoke exhaust chamber (4.7) is provided with a smoke exhaust port for communicating with a smoke exhaust machine.

9. The device for preparing highly profiled polyester stretch yarn according to claim 1, characterized in that: The preparation device of highly profiled polyester stretch yarn also includes a water cooler (5); on the yarn bundle running path, the water cooler (5) is located in front of the deformation heating box (4); the water cooler (5) includes an adjustment rod (5.1), a wire guide wheel (5.2) and a water tank (5.4); the adjustment rod (5.1) is arranged vertically, and the wire guide wheel (5.2) is located at the lower end of the adjustment rod (5.1) and is also located in the water tank (5.4).

10. A method for preparing highly profiled polyester stretch yarn, characterized in that: A device for preparing a highly profiled polyester stretch yarn as described in any one of claims 1 to 9 is used, wherein the single yarn fineness of the highly profiled polyester stretch yarn is ≤0.55dtex, the cross-section is a Feng-shaped, Wang-shaped, caterpillar-shaped or hollow-shaped type, the elongation at break is 21.76~23.85%, the breaking strength is 4.05~4.24cN / dtex, the dyeing M rate is 98.8~99.5%, and the profile degree is above 50%.

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