A method for preparing high-fiber heterogeneous shrinkage polyester filament

Abstract

This invention belongs to the field of polyester filament technology and discloses a method for preparing high-fiber, differentially shrinkable polyester filament. The high-fiber, differentially shrinkable polyester filament is composed of two strands of filament with different breaking elongations. The preparation method is as follows: after the melt is extruded from the spinneret, it is cooled to obtain multiple nascent fibers. These nascent fibers are divided into two equal parts and then pre-bundled through a pre-network to obtain two strands of filament (denoted as filament I and filament II). Then, filament I passes through the first and second U-shaped ceramic parts I, and filament II passes through the first and second U-shaped ceramic parts II. Afterward, filament I and filament II are respectively drawn and shaped by guide hooks and rollers I to V. Then, filament I and filament II are oiled and twisted, and then successively passed through roller VI, the main network, and roller VII before being wound to obtain high-fiber, differentially shrinkable polyester filament. This invention mainly achieves the differential shrinkage effect by controlling the tension to obtain filaments with different breaking elongations.

Description

Technical Field

[0001] This invention belongs to the field of polyester filament technology and relates to a method for preparing high-fiber heteroshrunk polyester filament. Background Technology

[0002] Polyester fiber, as the world's largest-produced and most widely used synthetic fiber, accounts for over 70% of global synthetic fiber production and is widely used in clothing, home textiles, decorative fabrics, and industrial textiles. In the civilian fiber sector, especially in bulk textiles, crimped fibers, due to their unique heterogeneous shrinkage structure, can give fabrics characteristics such as contrasting colors, fluffiness, breathability, and a velvety feel, making them very popular in the market. After heat treatment, the high-shrinkage components of these heterogeneous shrinkage polyester filaments form the core filament, while the low-shrinkage components float on the surface of the core filament, forming a fine loop structure, thus giving the fabric a fluffy, soft, and breathable effect.

[0003] Current methods for producing high-shrinkage polyester filaments generally employ blending two fibers with different shrinkage rates. For example, patent CN110747556B discloses a method for preparing a heterogeneous shrinkage composite yarn, which uses high-shrinkage POY (pre-oriented yarn) and low-shrinkage FDY (fully drawn yarn) to produce heterogeneous shrinkage fibers. However, due to the inconsistent requirements of POY and FDY in spinning and cooling processes, they need to undergo separate cooling and oiling treatments before being twisted and web-connected. During this process, the bundled properties of the two fibers are often poor, affecting subsequent weaving efficiency. Furthermore, POY, as a pre-oriented polyester yarn, has relatively low breaking strength. Even after blending with FDY, the resulting heterogeneous shrinkage polyester filament still lacks sufficient breaking strength, making it difficult to meet the requirements of the high-twist twisting market and the high-speed water-jet market. In existing technologies, two types of FDY fiber re-twisting can be produced simultaneously by changing the cooling conditions. However, since cooling conditions are crucial to the forming and physical properties of FDY fibers, for example, reducing the air velocity to increase the breaking elongation of a bundle of fibers can easily lead to uneven cooling of the bundles. In fact, the porous bundles that are not fully cooled may stick together due to contact, resulting in fuzzing. Conversely, increasing the air velocity to reduce the breaking elongation of a bundle of fibers can easily lead to a core-sheath structure, causing fuzzing and breakage of the fibers during stretching. Furthermore, a spinning station typically has eight or more components. To achieve the production of FDY fiber re-twisting using different cooling conditions, it is only possible to control the cooling conditions of the left and right sides of the side-blown cooling screen or the left and right sides of the ring-blown air box at a spinning station using dual air ducts and dual air volumes. When re-twisting bundles with inconsistent cooling between the left and right halves, the distance between the two bundles necessitates adjusting the angle of the bundles during re-twisting, which results in inconsistent friction between the two bundles and the ceramic components, leading to fuzzing.

[0004] Therefore, it is of great significance to study a method for preparing high-fiber heteroshrunk polyester filaments in order to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art and provide a method for preparing high-fiber heteroshrunk polyester filaments.

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

[0007] A method for preparing high-fiber, heterogeneous shrinkage polyester filament: After polyester melt is extruded from a spinneret, it is cooled to obtain multiple nascent fibers. The nascent fibers are divided into two equal parts and then pre-bundled through a pre-network to obtain two filament bundles, denoted as filament bundle I and filament bundle II. Fiber bundle I is then drawn and shaped through a first U-shaped ceramic element I, a second U-shaped ceramic element I, a guide hook, rollers I, II, III, IV, and V. Simultaneously, filament bundle II is drawn and shaped through a first U-shaped ceramic element II, a second U-shaped ceramic element II, a guide hook, rollers I, II, III, IV, and V. Afterward, filament bundles I and II are oiled and twisted together. The twisted filament bundles are then sequentially passed through roller VI, a main network, and roller VII before being wound to obtain high-fiber, heterogeneous shrinkage polyester filament.

[0008] Among them, the opening directions of the first U-shaped ceramic piece I and the second U-shaped ceramic piece I are opposite, and the opening directions of the first U-shaped ceramic piece II and the second U-shaped ceramic piece II are opposite;

[0009] The pressure sensor I is used to detect the pressure of the wires on the first U-shaped ceramic component I in real time. By comparing the pressure set range with the received pressure value, and based on the comparison result, the second U-shaped ceramic component I is controlled to move, so that the angle of the wire bundle I passing through the first U-shaped ceramic component I and the second U-shaped ceramic component I changes, so that the pressure of the wires on the first U-shaped ceramic component I returns to the set range.

[0010] Pressure sensor II is used to detect the pressure of the wires on the first U-shaped ceramic component II in real time. By comparing the pressure set range with the received pressure value, and based on the comparison result, the second U-shaped ceramic component II is controlled to move, so that the angle between the wire bundle II passing through the first U-shaped ceramic component II and the second U-shaped ceramic component II changes, so that the pressure of the wires on the first U-shaped ceramic component II returns to the set range.

[0011] The pressure range of the first U-shaped ceramic component I borne by the filament I is set as interval [a,b], and the pressure range of the first U-shaped ceramic component II borne by the filament II is set as interval [c,d], where c > b.

[0012] According to the preparation method of this invention, except for the pressure setting range, the process conditions for the two filament bundles are the same. According to the design of different pressure setting ranges in this invention, the pressure of filament bundle I and filament bundle II at different U-shaped ceramic angles can be different. That is, the pressure of filament bundle I passing through the first U-shaped ceramic I is less than the pressure of filament bundle II passing through the first U-shaped ceramic II. This is equivalent to the stretching of filament bundle I from the second U-shaped ceramic to roller I is less, so the breaking elongation is slightly increased. On the other hand, the pressure of filament bundle II passing through the first U-shaped ceramic II is greater. This is equivalent to the cold stretching of filament bundle II between the second U-shaped ceramic and roller I, resulting in a shorter breaking elongation. Since the breaking elongation of filament bundle I and filament bundle II are different, the breaking elongation can reflect the orientation degree of the fiber after stretching. The higher breaking elongation of filament bundle I indicates a lower orientation degree, which results in a strong heat shrinkage ability. Conversely, the lower breaking elongation of filament bundle II has a lower heat shrinkage ability. After oiling, they are twisted into a bundle and then heat-set in the subsequent weaving process, which can exhibit a differential shrinkage effect.

[0013] As a preferred technical solution:

[0014] As described above, in the preparation method of high-fiber heteroshrunk polyester filament, 35cN≤a≤130.5cN, b=1.05a, c=3a, d=1.05c; when the fineness of the fiber is different, the pressure set ranges of the first U-shaped ceramic part I bearing the pressure of filament I and the first U-shaped ceramic part II bearing the pressure of filament II will change, but both satisfy the given relationship.

[0015] In the above-described method for preparing high-fiber, heterogeneous shrinkage polyester filaments, the second U-shaped ceramic element I is located below the first U-shaped ceramic element I, the second U-shaped ceramic element II is located below the first U-shaped ceramic element II, and the roller I is located below the second U-shaped ceramic element I and the second U-shaped ceramic element II. The angle at which the filament bundle I passes through the first U-shaped ceramic element I and the second U-shaped ceramic element I refers to the angle between the filament bundle between the first U-shaped ceramic element I and the second U-shaped ceramic element I and the vertical direction. When the second U-shaped ceramic element I is displaced, the angle at which the filament bundle I passes through the first U-shaped ceramic element I and the second U-shaped ceramic element I is 3° to 8°.

[0016] The angle at which the filament bundle II passes through the first U-shaped ceramic piece II and the second U-shaped ceramic piece II refers to the angle between the filament bundle and the vertical direction between the first U-shaped ceramic piece II and the second U-shaped ceramic piece II; when the second U-shaped ceramic piece II is displaced, the angle at which the filament bundle II passes through the first U-shaped ceramic piece II and the second U-shaped ceramic piece II is 20° to 30°.

[0017] When the pressure of the first U-shaped ceramic component I on the filament I is set within the range of 35 to 137.5 cN, the angle between the filament I and the first U-shaped ceramic component I and the second U-shaped ceramic component I is 3° to 8°. When the pressure of the first U-shaped ceramic component II on the filament II is set within the range of 105 to 412.5 cN, the angle between the filament II and the first U-shaped ceramic component II and the second U-shaped ceramic component II is 20° to 30°.

[0018] In the above-described method for preparing high-fiber heteroshrunk polyester filament, the number of spinnerets at the spinning station is n; the number of the first U-shaped ceramic part I, the first U-shaped ceramic part II, the second U-shaped ceramic part I, and the second U-shaped ceramic part II are all n.

[0019] n first-stage U-shaped ceramic pieces I are fixed on U-shaped ceramic wire guide frame I, n first-stage U-shaped ceramic pieces II are fixed on U-shaped ceramic wire guide frame II, n second-stage U-shaped ceramic pieces I are fixed on U-shaped ceramic wire guide frame III, and n second-stage U-shaped ceramic pieces II are fixed on U-shaped ceramic wire guide frame IV.

[0020] There is a one-to-one correspondence between n first-row U-shaped porcelain pieces I and n second-row U-shaped porcelain pieces I, and a one-to-one correspondence between n first-row U-shaped porcelain pieces II and n second-row U-shaped porcelain pieces II.

[0021] A pressure sensor I is installed at one end of the U-shaped ceramic wire guide frame I. The pressure sensor I is connected to a control instrument I via a wire. The control instrument I is connected to a servo driver I via a wire. The servo driver I is connected to a servo motor I via a wire. The drive shaft I of the servo motor I is connected to a pinion I. The pinion I meshes with a large gear I. The large gear I is connected to the drive wheel of the conveyor belt I via a connecting rod I. The U-shaped ceramic wire guide frame III is fixed on the belt of the conveyor belt I. When the large gear I rotates, it drives the drive wheel of the conveyor belt I to rotate, and the U-shaped ceramic wire guide frame III on the conveyor belt I moves horizontally. The U-shaped ceramic wire guide frame I and the U-shaped ceramic wire guide frame III are parallel to each other.

[0022] A pressure sensor II is installed at one end of the U-shaped ceramic wire guide frame II. The pressure sensor II is connected to the control instrument II via a wire. The control instrument II is connected to the servo driver II via a wire. The servo driver II is connected to the servo motor II via a wire. The drive shaft II of the servo motor II is connected to the pinion II. The pinion II meshes with the large gear II. The large gear II is connected to the drive wheel of the conveyor belt II via the connecting rod II. The U-shaped ceramic wire guide frame IV is fixed on the belt of the conveyor belt II. When the large gear II rotates, it drives the drive wheel of the conveyor belt II to rotate, and the U-shaped ceramic wire guide frame IV on the conveyor belt II moves horizontally. The U-shaped ceramic wire guide frame II and the U-shaped ceramic wire guide frame IV are parallel to each other.

[0023] In the above-described method for preparing high-fiber heteroshrunk polyester filaments, when the pressure fed back by pressure sensor I is less than a, the second U-shaped ceramic element I is moved to increase the angle at which the filament bundle passes through the first and second U-shaped ceramic elements I until the pressure detected by pressure sensor I is within the range [a, b]. When the pressure fed back by pressure sensor I is greater than b, the second U-shaped ceramic element I is moved to decrease the angle at which the filament bundle passes through the first and second U-shaped ceramic elements I until the detected pressure is within the range [a, b].

[0024] When the pressure fed back by pressure sensor II is less than c, the second U-shaped ceramic component II is moved, so that the angle between the first and second U-shaped ceramic components II and the wire bundle increases until the pressure detected by pressure sensor II is within the range [c, d]. When the pressure fed back by pressure sensor II is greater than d, the second U-shaped ceramic component II is moved, so that the angle between the first and second U-shaped ceramic components II and the wire bundle decreases until the detected pressure is within the range [c, d].

[0025] The method for preparing high-fiber heteroshrunk polyester filaments as described above involves a pre-network pressure of 0.015±0.002MPa, a main network pressure of 0.42~0.45MPa, and a relatively large main network pressure for composite filament bundles with different tensions. The purpose is to increase the number of network points and network strength, thereby improving the subsequent weaving performance. The oiling agent concentration is 20±1%.

[0026] The method for preparing high-fiber heteroshrunk polyester filament as described above involves the following speeds: roller I speed is 1700–1850 m / min, roller II speed is 1700–1850 m / min, roller III speed is 1800–1950 m / min, roller IV speed is 4100–4700 m / min, roller V speed is 4100–4700 m / min, roller VI speed is 4110–4710 m / min, roller VII speed is 4115–4720 m / min, and winding speed is 4000–4500 m / min.

[0027] The method for preparing high-fiber heteroshrunk polyester filament as described above involves a spinneret orifice diameter of 0.14–0.19 mm, a roughness (Ra) of 0.05–0.1 μm for rollers II and III, and a roughness (Ra) of 0.9–1.1 μm for rollers IV and V.

[0028] When the orifice diameter of the spinneret is 0.14–0.19 mm, the monofilaments are relatively fine, which can impart better nap to the subsequent fabric. However, when the monofilaments in the yarn bundle are very fine, there is more air trapped in the yarn bundle, which can easily lead to problems such as shaking and yarn bundling on rollers II to V. Therefore, mirror friction rollers with a roughness (Ra) of 0.05–0.1 μm are selected for rollers II and III. The purpose is to increase the contact area between the mirror roller and the yarn bundle, improve the glassiness of the yarn bundle, and thus make the yarn bundle more elastic, preventing shaking and yarn bundling. The roughness (Ra) of rollers IV and V is selected to be 0.9–1.1 μm. This is mainly because the yarn bundle achieves drafting after passing through the speed difference of rollers III and IV. By selecting rollers with a larger roughness, the yarn gripping force is reduced, the tension is reduced, and thus the problems of fuzzing and yarn bundling are reduced.

[0029] The method for preparing high-fiber heteroshrunk polyester filament as described above, wherein the specifications of the high-fiber heteroshrunk polyester filament are 60-168 dtex / 128-144f; the high-fiber heteroshrunk polyester filament is composed of two strands, one strand having a breaking elongation of 32-35% and the other strand having a breaking elongation of 20-25%.

[0030] Beneficial effects:

[0031] (1) This invention achieves heterogeneous shrinkage by plying two strands of filaments with different elongation at break. Since both strands are FDY products, they have the same requirements in terms of spinning and cooling processes. Therefore, strands with different elongation at break can be obtained simply by controlling the tension. This method not only avoids the problem of poor bundle cohesion of the two strands in the traditional method, but also, since all the strands are FDY products, the resulting high-fiber heterogeneous shrinkage polyester filaments have higher breaking strength than the blended POY and FDY filaments, which fully meets the strength requirements of downstream customers.

[0032] (2) The present invention monitors the pressure of the wire on the U-shaped ceramic piece in real time by means of a pressure sensor, and compares the value fed back by the pressure sensor with the pressure setting range. When the pressure exceeds the setting range, the U-shaped ceramic piece is adjusted to move, so that the pressure of the wire on the U-shaped ceramic piece is always kept within the pressure setting range. Attached Figure Description

[0033] Figure 1 This is a schematic diagram illustrating tension control during the preparation of high-fiber heteroshrunk polyester filaments according to the present invention.

[0034] Figure 2 The graph shows the breaking elongation of two strands in the high-fluffy, heteroshrunk polyester filament prepared in Example 5 of this invention.

[0035] In the diagram, 1-First U-shaped ceramic component I, 2-Second U-shaped ceramic component I, 3-Pressure sensor I, 4-Control instrument I, 5-Servo driver I, 6-Servo motor I, 7-Pinary gear I, 8-Large gear I, 9-Conveyor belt I, 10-First U-shaped ceramic component II, 11-Second U-shaped ceramic component II, 12-Pressure sensor II, 13-Control instrument II, 14-Servo driver II, 15-Servo motor II, 16-Pinary gear II, 17-Large gear II, 18-Conveyor belt II. Detailed Implementation

[0036] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0037] To ensure that the performance of the substances used in each embodiment and comparative example is fully disclosed, the manufacturers and brands of the substances are specified. Other manufacturers and brands that conform to the limitations of this invention are also feasible.

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

[0039] Elongation at break: The high-fiber, heteroshrunk polyester filaments prepared in each embodiment were used as samples. The tensile properties of chemical fiber filaments were tested using a fully automatic single-yarn tensile testing machine (model YG023B-Ⅱ) according to GB / T14344-2022 "Test Method for Tensile Properties of Chemical Fiber Filaments". The specific process was as follows: the samples were first conditioned in an environment with a temperature of 20℃ and a humidity of 65% for 4 hours. Then, they were clamped by upper and lower clamps (clamping length of 500mm), and a pretension of 0.05cN / dtex was applied by a robot to stabilize the samples. At the beginning of the test, the lower clamp was stretched at a speed of 500mm / min until both filaments broke. At the same time, the real-time data of the force sensor was recorded during the stretching process, and the relationship curve between breaking strength and elongation was plotted by the data collection system. Finally, the elongation at break of each of the two filaments was obtained by plotting the horizontal axis of the curve.

[0040] Example 1

[0041] A method for preparing high-fiber, heterogeneous shrinkage polyester filament, comprising the following steps:

[0042] Polyester melt with an intrinsic viscosity of 0.616 dL / g is metered by a metering pump, extruded through a spinneret, and then cooled to obtain 128 nascent fibers. The 128 nascent fibers are divided into two equal parts and then pre-bundled through a pre-network to obtain two filament bundles, denoted as filament bundle I and filament bundle II. Fiber bundle I is then drawn and shaped through the first U-shaped ceramic part I, the second U-shaped ceramic part I, the guide hook, rollers I, II, III, IV, and V. At the same time, filament bundle II is drawn and shaped through the first U-shaped ceramic part II, the second U-shaped ceramic part II, the guide hook, rollers I, II, III, IV, and V. After that, filament bundle I and filament bundle II are oiled and twisted, and then sequentially passed through roller VI, the main network, and roller VII before being wound to obtain a high-fiber, heteroshrunk polyester filament with a specification of 60 dtex / 128f.

[0043] The pre-network pressure is 0.015 MPa, the main network pressure is 0.42 MPa, the oiling agent concentration is 21 wt% (obtained by uniformly mixing commercially available oiling agent (manufacturer: Tongxiang Henglong Chemical Co., Ltd., brand name: TK-1001L) and water), the roller speed is 1700 m / min, the roller speed is 1710 m / min, the roller temperature is 55℃, the roller speed is 1800 m / min, the roller temperature is 60℃, the roller speed is 4100 m / min, the roller temperature is 122℃, the roller speed is 4100 m / min, the roller temperature is 122℃, the roller speed is 4110 m / min, the roller speed is 4115 m / min, and the winding speed is 4000 m / min.

[0044] The surface roughness (Ra) of roller I is 0.01 μm, the surface roughness (Ra) of rollers II and III is 0.05 μm, the surface roughness (Ra) of rollers IV and V is 0.9 μm, and the surface roughness (Ra) of rollers VI and VII is 0.9 μm.

[0045] There are 12 spinnerets at the spinning position, and the diameter of the spinneret holes is 0.14 mm.

[0046] The opening directions of the first U-shaped ceramic piece I1 and the second U-shaped ceramic piece I2 are opposite, and the opening directions of the first U-shaped ceramic piece II 10 and the second U-shaped ceramic piece II 11 are opposite.

[0047] The pressure set range for the first U-shaped ceramic component I to bear the filament bundle I is 35-37 cN, and the pressure set range for the first U-shaped ceramic component II to bear the filament bundle II is 105-110 cN.

[0048] The number of the first U-shaped porcelain piece I, the first U-shaped porcelain piece II, the second U-shaped porcelain piece I, and the second U-shaped porcelain piece II is 12 each;

[0049] like Figure 1 As shown, 12 first-stage U-shaped ceramic pieces I1 are fixed on U-shaped ceramic wire guide frame I, 12 first-stage U-shaped ceramic pieces II 10 are fixed on U-shaped ceramic wire guide frame II, 12 second-stage U-shaped ceramic pieces I 2 are fixed on U-shaped ceramic wire guide frame III, and 12 second-stage U-shaped ceramic pieces II 11 are fixed on U-shaped ceramic wire guide frame IV.

[0050] The 12 first-row U-shaped porcelain pieces I1 correspond one-to-one with the 12 second-row U-shaped porcelain pieces I2, and the 12 first-row U-shaped porcelain pieces II10 correspond one-to-one with the 12 second-row U-shaped porcelain pieces II11.

[0051] A pressure sensor I3 is installed at one end of the U-shaped ceramic wire guide frame I1. The pressure sensor I3 is connected to the control instrument I4 via a wire. The control instrument I4 is connected to the servo driver I5 via a wire. The servo driver I5 is connected to the servo motor I6 via a wire. The drive shaft I of the servo motor I6 is connected to a pinion I7. The pinion I7 meshes with a large gear I8. The large gear I8 is connected to the drive wheel of the conveyor belt I9 via a connecting rod I. The U-shaped ceramic wire guide frame III is fixed on the belt of the conveyor belt I9. When the large gear I8 rotates, it drives the drive wheel of the conveyor belt I9 to rotate, and the U-shaped ceramic wire guide frame III on the conveyor belt I9 moves horizontally. The U-shaped ceramic wire guide frame I and the U-shaped ceramic wire guide frame III are parallel to each other.

[0052] A pressure sensor II 12 is installed at one end of the U-shaped ceramic wire guide frame II. The pressure sensor II 12 is connected to the control instrument II 13 via a wire. The control instrument II 13 is connected to the servo driver II 14 via a wire. The servo driver II 15 is connected to the servo motor II 15 via a wire. The drive shaft II of the servo motor II 15 is connected to the pinion II 16. The pinion II 16 meshes with the large gear II 17. The large gear II 17 is connected to the drive wheel of the conveyor belt II 18 via the connecting rod II. The U-shaped ceramic wire guide frame IV is fixed on the belt of the conveyor belt II 18. When the large gear II 17 rotates, it drives the drive wheel of the conveyor belt II 18 to rotate, and the U-shaped ceramic wire guide frame IV on the conveyor belt II 18 moves horizontally. The U-shaped ceramic wire guide frame II and the U-shaped ceramic wire guide frame IV are parallel to each other.

[0053] Pressure sensor I3 is used to detect the pressure of the filament I on the first U-shaped ceramic component I1 in real time. By comparing the pressure setting range with the received pressure value, and based on the comparison result, the displacement of the second U-shaped ceramic component I2 is controlled so that the angle between the filament I and the second U-shaped ceramic component I2 (i.e., the angle between the filament I and the vertical direction between the first U-shaped ceramic component I1 and the second U-shaped ceramic component I2) is 5°, so that the pressure of the filament I on the first U-shaped ceramic component I1 is 37cN.

[0054] Pressure sensor II 12 is used to detect the pressure of the filament II on the first U-shaped ceramic component II 10 in real time. By comparing the pressure setting range with the received pressure value, and based on the comparison result, the displacement of the second U-shaped ceramic component II 11 is controlled so that the angle between the first U-shaped ceramic component II 10 and the second U-shaped ceramic component II 11 (i.e., the angle between the filament II between the first U-shaped ceramic component II 10 and the second U-shaped ceramic component II 11 and the vertical direction) is 20°, so that the pressure value of the filament II on the first U-shaped ceramic component II 10 is 105cN.

[0055] The final high-fiber heteroshrunk polyester filament consists of two strands, one with a breaking elongation of 32% and the other with a breaking elongation of 24%.

[0056] Example 2

[0057] A method for preparing high-fiber, heterogeneous shrinkage polyester filament, comprising the following steps:

[0058] Polyester melt with an intrinsic viscosity of 0.625 dL / g is metered by a metering pump, extruded through a spinneret, and then cooled to obtain 144 nascent fibers. The 144 nascent fibers are divided into two equal parts and then pre-bundled through a pre-network to obtain two filament bundles, denoted as filament bundle I and filament bundle II. Fiber bundle I is then drawn and shaped through the first U-shaped ceramic part I, the second U-shaped ceramic part I, the guide hook, rollers I, II, III, IV, and V. At the same time, filament bundle II is drawn and shaped through the first U-shaped ceramic part II, the second U-shaped ceramic part II, the guide hook, rollers I, II, III, IV, and V. After that, filament bundles I and II are oiled and twisted, and then sequentially passed through roller VI, the main network, and roller VII before being wound to obtain a high-fiber, heteroshrunk polyester filament with a specification of 65 dtex / 144f.

[0059] The pre-network pressure is 0.013 MPa, the main network pressure is 0.43 MPa, the oiling agent concentration is 19 wt% (obtained by uniformly mixing commercially available oiling agent (manufacturer: Tongxiang Henglong Chemical Co., Ltd., brand name: TK-1001L) and water), the roller speed is 1745 m / min, the roller speed is 1755 m / min, the roller temperature is 65℃, the roller speed is 1845 m / min, the roller temperature is 70℃, the roller speed is 4300 m / min, the roller temperature is 128℃, the roller speed is 4300 m / min, the roller temperature is 128℃, the roller speed is 4310 m / min, the roller speed is 4315 m / min, and the winding speed is 4300 m / min.

[0060] The surface roughness (Ra) of roller I is 0.01 μm, the surface roughness (Ra) of rollers II and III is 0.06 μm, the surface roughness (Ra) of rollers IV and V is 1 μm, and the surface roughness (Ra) of rollers VI and VII is 1.0 μm.

[0061] There are 12 spinnerets at the spinning position, and the diameter of the spinneret holes is 0.15mm.

[0062] The opening directions of the first U-shaped ceramic piece I and the second U-shaped ceramic piece I are opposite, and the opening directions of the first U-shaped ceramic piece II and the second U-shaped ceramic piece II are opposite;

[0063] The pressure set range for the first U-shaped ceramic component I to bear the filament bundle I is 38-40 cN, and the pressure set range for the first U-shaped ceramic component II to bear the filament bundle II is 114-120 cN.

[0064] The number of the first U-shaped porcelain piece I, the first U-shaped porcelain piece II, the second U-shaped porcelain piece I, and the second U-shaped porcelain piece II is 12 each;

[0065] Twelve first-stage U-shaped ceramic pieces I are fixed on U-shaped ceramic wire guide frame I, twelve first-stage U-shaped ceramic pieces II are fixed on U-shaped ceramic wire guide frame II, twelve second-stage U-shaped ceramic pieces I are fixed on U-shaped ceramic wire guide frame III, and twelve second-stage U-shaped ceramic pieces II are fixed on U-shaped ceramic wire guide frame IV.

[0066] The 12 first-row U-shaped porcelain pieces I correspond one-to-one with the 12 second-row U-shaped porcelain pieces I, and the 12 first-row U-shaped porcelain pieces II correspond one-to-one with the 12 second-row U-shaped porcelain pieces II.

[0067] A pressure sensor I is installed at one end of the U-shaped ceramic wire guide frame I. The pressure sensor I is connected to a control instrument I via a wire. The control instrument I is connected to a servo driver I via a wire. The servo driver I is connected to a servo motor I via a wire. The drive shaft I of the servo motor I is connected to a pinion I. The pinion I meshes with a large gear I. The large gear I is connected to the drive wheel of the conveyor belt I via a connecting rod I. The U-shaped ceramic wire guide frame III is fixed on the belt of the conveyor belt I. When the large gear I rotates, it drives the drive wheel of the conveyor belt I to rotate, and the U-shaped ceramic wire guide frame III on the conveyor belt I moves horizontally. The U-shaped ceramic wire guide frame I and the U-shaped ceramic wire guide frame III are parallel to each other.

[0068] A pressure sensor II is installed at one end of the U-shaped ceramic wire guide frame II. The pressure sensor II is connected to a control instrument II via a wire. The control instrument II is connected to a servo driver II via a wire. The servo driver II is connected to a servo motor II via a wire. The drive shaft II of the servo motor II is connected to a pinion II. The pinion II meshes with a large gear II. The large gear II is connected to the drive wheel of the conveyor belt II via a connecting rod II. The U-shaped ceramic wire guide frame IV is fixed on the belt of the conveyor belt II. When the large gear II rotates, it drives the drive wheel of the conveyor belt II to rotate, and the U-shaped ceramic wire guide frame IV on the conveyor belt II moves horizontally. The U-shaped ceramic wire guide frame II and the U-shaped ceramic wire guide frame IV are parallel to each other.

[0069] The pressure sensor I is used to detect the pressure of the filament I on the first U-shaped ceramic piece I in real time. By comparing the pressure setting range with the received pressure value, and based on the comparison result, the displacement of the second U-shaped ceramic piece I is controlled so that the angle between the filament I and the first U-shaped ceramic piece I is 4°, so that the pressure of the filament I on the first U-shaped ceramic piece I is 39cN.

[0070] Pressure sensor II is used to detect the pressure of the first U-shaped ceramic component II on the filament II in real time. By comparing the pressure setting range with the received pressure value, and based on the comparison result, the displacement of the second U-shaped ceramic component II is controlled so that the angle between the filament II passing through the first U-shaped ceramic component II and the second U-shaped ceramic component II is 22°, so that the pressure value of the filament II on the first U-shaped ceramic component II is 116cN.

[0071] The final high-fiber heteroshrunk polyester filament consists of two strands, one with a breaking elongation of 34% and the other with a breaking elongation of 23%.

[0072] Example 3

[0073] A method for preparing high-fiber, heterogeneous shrinkage polyester filament, comprising the following steps:

[0074] Polyester melt with an intrinsic viscosity of 0.619 dL / g is metered by a metering pump, extruded through a spinneret, and then cooled to obtain 128 nascent fibers. The 128 nascent fibers are divided into two equal parts and then pre-bundled through a pre-network to obtain two filament bundles, denoted as filament bundle I and filament bundle II. Fiber bundle I is then drawn and shaped through the first U-shaped ceramic part I, the second U-shaped ceramic part I, the guide hook, rollers I, II, III, IV, and V. At the same time, filament bundle II is drawn and shaped through the first U-shaped ceramic part II, the second U-shaped ceramic part II, the guide hook, rollers I, II, III, IV, and V. After that, filament bundle I and filament bundle II are oiled and twisted, and then sequentially passed through roller VI, the main network, and roller VII before being wound to obtain a high-fiber, heteroshrunk polyester filament with a specification of 83 dtex / 128f.

[0075] The pre-network pressure is 0.017 MPa, the main network pressure is 0.45 MPa, the oiling agent concentration is 20.3 wt% (obtained by uniformly mixing commercially available oiling agent (manufacturer: Tongxiang Henglong Chemical Co., Ltd., brand name: TK-1001L) and water), the roller speed is 1750 m / min, the roller speed is 1760 m / min, the roller temperature is 75℃, the roller speed is 1850 m / min, the roller temperature is 80℃, the roller speed is 4400 m / min, the roller temperature is 135℃, the roller speed is 4400 m / min, the roller temperature is 135℃, the roller speed is 4410 m / min, the roller speed is 4420 m / min, and the winding speed is 4400 m / min.

[0076] The surface roughness (Ra) of roller I is 0.01 μm, the surface roughness (Ra) of rollers II and III is 0.08 μm, the surface roughness (Ra) of rollers IV and V is 1.1 μm, and the surface roughness (Ra) of rollers VI and VII is 1.1 μm.

[0077] There are 16 spinnerets at the spinning position, and the diameter of the spinneret holes is 0.16 mm.

[0078] The opening directions of the first U-shaped ceramic piece I and the second U-shaped ceramic piece I are opposite, and the opening directions of the first U-shaped ceramic piece II and the second U-shaped ceramic piece II are opposite;

[0079] The pressure range of the first U-shaped ceramic component I bearing the filament bundle I is 64.5 to 68 cN, and the pressure range of the first U-shaped ceramic component II bearing the filament bundle II is 193.5 to 203 cN.

[0080] The number of the first U-shaped porcelain piece I, the first U-shaped porcelain piece II, the second U-shaped porcelain piece I, and the second U-shaped porcelain piece II is 16 each;

[0081] Sixteen first-stage U-shaped ceramic pieces I are fixed on U-shaped ceramic wire guide frame I, sixteen first-stage U-shaped ceramic pieces II are fixed on U-shaped ceramic wire guide frame II, sixteen second-stage U-shaped ceramic pieces I are fixed on U-shaped ceramic wire guide frame III, and sixteen second-stage U-shaped ceramic pieces II are fixed on U-shaped ceramic wire guide frame IV.

[0082] There is a one-to-one correspondence between the 16 first-row U-shaped porcelain pieces I and the 16 second-row U-shaped porcelain pieces I, and a one-to-one correspondence between the 16 first-row U-shaped porcelain pieces II and the 16 second-row U-shaped porcelain pieces II.

[0083] A pressure sensor I is installed at one end of the U-shaped ceramic wire guide frame I. The pressure sensor I is connected to a control instrument I via a wire. The control instrument I is connected to a servo driver I via a wire. The servo driver I is connected to a servo motor I via a wire. The drive shaft I of the servo motor I is connected to a pinion I. The pinion I meshes with a large gear I. The large gear I is connected to the drive wheel of the conveyor belt I via a connecting rod I. The U-shaped ceramic wire guide frame III is fixed on the belt of the conveyor belt I. When the large gear I rotates, it drives the drive wheel of the conveyor belt I to rotate, and the U-shaped ceramic wire guide frame III on the conveyor belt I moves horizontally. The U-shaped ceramic wire guide frame I and the U-shaped ceramic wire guide frame III are parallel to each other.

[0084] A pressure sensor II is installed at one end of the U-shaped ceramic wire guide frame II. The pressure sensor II is connected to a control instrument II via a wire. The control instrument II is connected to a servo driver II via a wire. The servo driver II is connected to a servo motor II via a wire. The drive shaft II of the servo motor II is connected to a pinion II. The pinion II meshes with a large gear II. The large gear II is connected to the drive wheel of the conveyor belt II via a connecting rod II. The U-shaped ceramic wire guide frame IV is fixed on the belt of the conveyor belt II. When the large gear II rotates, it drives the drive wheel of the conveyor belt II to rotate, and the U-shaped ceramic wire guide frame IV on the conveyor belt II moves horizontally. The U-shaped ceramic wire guide frame II and the U-shaped ceramic wire guide frame IV are parallel to each other.

[0085] The pressure sensor I is used to detect the pressure of the filament I on the first U-shaped ceramic piece I in real time. By comparing the pressure setting range with the received pressure value, and based on the comparison result, the displacement of the second U-shaped ceramic piece I is controlled so that the angle between the filament I and the first U-shaped ceramic piece I is 6°, so that the pressure of the filament I on the first U-shaped ceramic piece I is 66cN.

[0086] Pressure sensor II is used to detect the pressure of the first U-shaped ceramic component II on the filament II in real time. By comparing the pressure setting range with the received pressure value, and based on the comparison result, the displacement of the second U-shaped ceramic component II is controlled so that the angle between the filament II passing through the first U-shaped ceramic component II and the second U-shaped ceramic component II is 23°, so that the pressure value of the filament II on the first U-shaped ceramic component II is 195cN.

[0087] The final high-fiber heteroshrunk polyester filament consists of two strands, one with a breaking elongation of 33% and the other with a breaking elongation of 24%.

[0088] Example 4

[0089] A method for preparing high-fiber, heterogeneous shrinkage polyester filament, comprising the following steps:

[0090] Polyester melt with an intrinsic viscosity of 0.623 dL / g is metered by a metering pump, extruded through a spinneret, and then cooled to obtain 144 nascent fibers. The 144 nascent fibers are divided into two equal parts and then pre-bundled through a pre-network to obtain two filament bundles, denoted as filament bundle I and filament bundle II. Fiber bundle I is then drawn and shaped through the first U-shaped ceramic part I, the second U-shaped ceramic part I, the guide hook, rollers I, II, III, IV, and V. At the same time, filament bundle II is drawn and shaped through the first U-shaped ceramic part II, the second U-shaped ceramic part II, the guide hook, rollers I, II, III, IV, and V. After that, filament bundle I and filament bundle II are oiled and twisted, and then successively passed through roller VI, the main network, and roller VII before being wound to obtain a high-fiber, heteroshrunk polyester filament with a specification of 168 dtex / 144f.

[0091] The pre-network pressure is 0.016 MPa, the main network pressure is 0.43 MPa, the oiling agent concentration is 19.5 wt% (obtained by uniformly mixing commercially available oiling agent (manufacturer: Tongxiang Henglong Chemical Co., Ltd., brand name: TK-1001L) and water), the roller speed is 1850 m / min, the roller speed is 1860 m / min, the roller temperature is 78℃, the roller speed is 1950 m / min, the roller temperature is 85℃, the roller speed is 4700 m / min, the roller temperature is 142℃, the roller speed is 4700 m / min, the roller temperature is 142℃, the roller speed is 4710 m / min, the roller speed is 4720 m / min, and the winding speed is 4500 m / min.

[0092] The surface roughness (Ra) of roller I is 0.01 μm, the surface roughness (Ra) of rollers II and III is 0.1 μm, the surface roughness (Ra) of rollers IV and V is 1.1 μm, and the surface roughness (Ra) of rollers VI and VII is 1.1 μm.

[0093] There are 16 spinnerets at the spinning position, and the diameter of the spinneret holes is 0.19 mm.

[0094] The opening directions of the first U-shaped ceramic piece I and the second U-shaped ceramic piece I are opposite, and the opening directions of the first U-shaped ceramic piece II and the second U-shaped ceramic piece II are opposite;

[0095] The pressure set range for the first U-shaped ceramic component I to bear the filament bundle I is 130.5 to 137 cN, and the pressure set range for the first U-shaped ceramic component II to bear the filament bundle II is 391.5 to 411 cN.

[0096] Sixteen first-stage U-shaped ceramic pieces I are fixed on U-shaped ceramic wire guide frame I, sixteen first-stage U-shaped ceramic pieces II are fixed on U-shaped ceramic wire guide frame II, sixteen second-stage U-shaped ceramic pieces I are fixed on U-shaped ceramic wire guide frame III, and sixteen second-stage U-shaped ceramic pieces II are fixed on U-shaped ceramic wire guide frame IV.

[0097] The number of the first U-shaped porcelain piece I, the first U-shaped porcelain piece II, the second U-shaped porcelain piece I, and the second U-shaped porcelain piece II is 16 each;

[0098] There is a one-to-one correspondence between the 16 first-row U-shaped porcelain pieces I and the 16 second-row U-shaped porcelain pieces I, and a one-to-one correspondence between the 16 first-row U-shaped porcelain pieces II and the 16 second-row U-shaped porcelain pieces II.

[0099] A pressure sensor I is installed at one end of the U-shaped ceramic wire guide frame I. The pressure sensor I is connected to a control instrument I via a wire. The control instrument I is connected to a servo driver I via a wire. The servo driver I is connected to a servo motor I via a wire. The drive shaft I of the servo motor I is connected to a pinion I. The pinion I meshes with a large gear I. The large gear I is connected to the drive wheel of the conveyor belt I via a connecting rod I. The U-shaped ceramic wire guide frame III is fixed on the belt of the conveyor belt I. When the large gear I rotates, it drives the drive wheel of the conveyor belt I to rotate, and the U-shaped ceramic wire guide frame III on the conveyor belt I moves horizontally. The U-shaped ceramic wire guide frame I and the U-shaped ceramic wire guide frame III are parallel to each other.

[0100] A pressure sensor II is installed at one end of the U-shaped ceramic wire guide frame II. The pressure sensor II is connected to a control instrument II via a wire. The control instrument II is connected to a servo driver II via a wire. The servo driver II is connected to a servo motor II via a wire. The drive shaft II of the servo motor II is connected to a pinion II. The pinion II meshes with a large gear II. The large gear II is connected to the drive wheel of the conveyor belt II via a connecting rod II. The U-shaped ceramic wire guide frame IV is fixed on the belt of the conveyor belt II. When the large gear II rotates, it drives the drive wheel of the conveyor belt II to rotate, and the U-shaped ceramic wire guide frame IV on the conveyor belt II moves horizontally. The U-shaped ceramic wire guide frame II and the U-shaped ceramic wire guide frame IV are parallel to each other.

[0101] The pressure sensor I is used to detect the pressure of the filament I on the first U-shaped ceramic piece I in real time. By comparing the pressure setting range with the received pressure value, and based on the comparison result, the displacement of the second U-shaped ceramic piece I is controlled so that the angle between the filament I and the first U-shaped ceramic piece I is 5°, so that the pressure of the filament I on the first U-shaped ceramic piece I is 133cN.

[0102] Pressure sensor II is used to detect the pressure of the first U-shaped ceramic component II on the filament II in real time. By comparing the pressure setting range with the received pressure value, and based on the comparison result, the displacement of the second U-shaped ceramic component II is controlled so that the angle between the filament II and the first U-shaped ceramic component II is 30°, so that the pressure of the filament II on the first U-shaped ceramic component II is 411cN.

[0103] The final high-fiber heteroshrunk polyester filament consists of two strands, one with a breaking elongation of 34% and the other with a breaking elongation of 20%.

[0104] Example 5

[0105] A method for preparing high-fiber, heterogeneous shrinkage polyester filament, comprising the following steps:

[0106] Polyester melt with an intrinsic viscosity of 0.621 dL / g is metered by a metering pump, extruded through a spinneret, and then cooled to obtain 144 nascent fibers. The 144 nascent fibers are divided into two equal parts and then pre-bundled through a pre-network to obtain two filament bundles, denoted as filament bundle I and filament bundle II. Fiber bundle I is then drawn and shaped through the first U-shaped ceramic part I, the second U-shaped ceramic part I, the guide hook, rollers I, II, III, IV, and V. At the same time, filament bundle II is drawn and shaped through the first U-shaped ceramic part II, the second U-shaped ceramic part II, the guide hook, rollers I, II, III, IV, and V. After that, filament bundles I and II are oiled and twisted, and then sequentially passed through roller VI, the main network, and roller VII before being wound to obtain a high-fiber, heteroshrunk polyester filament with a specification of 83 dtex / 144f.

[0107] The pre-network pressure is 0.017 MPa, the main network pressure is 0.44 MPa, the oiling agent concentration is 20.2 wt% (obtained by uniformly mixing commercially available oiling agent (manufacturer: Tongxiang Henglong Chemical Co., Ltd., brand name: TK-1001L) and water), the roller speed is 1810 m / min, the roller speed is 1840 m / min, the roller temperature is 75℃, the roller speed is 1910 m / min, the roller temperature is 80℃, the roller speed is 4400 m / min, the roller temperature is 135℃, the roller speed is 4400 m / min, the roller temperature is 138℃, the roller speed is 4410 m / min, the roller speed is 4420 m / min, and the winding speed is 4300 m / min.

[0108] The surface roughness (Ra) of roller I is 0.01 μm, the surface roughness (Ra) of rollers II and III is 0.08 μm, the surface roughness (Ra) of rollers IV and V is 1 μm, and the surface roughness (Ra) of rollers VI and VII is 1.0 μm.

[0109] There are 16 spinnerets at the spinning position, and the diameter of the spinneret holes is 0.16 mm.

[0110] The opening directions of the first U-shaped ceramic piece I and the second U-shaped ceramic piece I are opposite, and the opening directions of the first U-shaped ceramic piece II and the second U-shaped ceramic piece II are opposite;

[0111] The pressure range of the first U-shaped ceramic component I bearing the filament bundle I is 64.5 to 68 cN, and the pressure range of the first U-shaped ceramic component II bearing the filament bundle II is 193.5 to 203 cN.

[0112] The number of the first U-shaped porcelain piece I, the first U-shaped porcelain piece II, the second U-shaped porcelain piece I, and the second U-shaped porcelain piece II is 16 each;

[0113] Sixteen first-stage U-shaped ceramic pieces I are fixed on U-shaped ceramic wire guide frame I, sixteen first-stage U-shaped ceramic pieces II are fixed on U-shaped ceramic wire guide frame II, sixteen second-stage U-shaped ceramic pieces I are fixed on U-shaped ceramic wire guide frame III, and sixteen second-stage U-shaped ceramic pieces II are fixed on U-shaped ceramic wire guide frame IV.

[0114] There is a one-to-one correspondence between the 16 first-row U-shaped porcelain pieces I and the 16 second-row U-shaped porcelain pieces I, and a one-to-one correspondence between the 16 first-row U-shaped porcelain pieces II and the 16 second-row U-shaped porcelain pieces II.

[0115] A pressure sensor I is installed at one end of the U-shaped ceramic wire guide frame I. The pressure sensor I is connected to a control instrument I via a wire. The control instrument I is connected to a servo driver I via a wire. The servo driver I is connected to a servo motor I via a wire. The drive shaft I of the servo motor I is connected to a pinion I. The pinion I meshes with a large gear I. The large gear I is connected to the drive wheel of the conveyor belt I via a connecting rod I. The U-shaped ceramic wire guide frame III is fixed on the belt of the conveyor belt I. When the large gear I rotates, it drives the drive wheel of the conveyor belt I to rotate, and the U-shaped ceramic wire guide frame III on the conveyor belt I moves horizontally. The U-shaped ceramic wire guide frame I and the U-shaped ceramic wire guide frame III are parallel to each other.

[0116] A pressure sensor II is installed at one end of the U-shaped ceramic wire guide frame II. The pressure sensor II is connected to a control instrument II via a wire. The control instrument II is connected to a servo driver II via a wire. The servo driver II is connected to a servo motor II via a wire. The drive shaft II of the servo motor II is connected to a pinion II. The pinion II meshes with a large gear II. The large gear II is connected to the drive wheel of the conveyor belt II via a connecting rod II. The U-shaped ceramic wire guide frame IV is fixed on the belt of the conveyor belt II. When the large gear II rotates, it drives the drive wheel of the conveyor belt II to rotate, and the U-shaped ceramic wire guide frame IV on the conveyor belt II moves horizontally. The U-shaped ceramic wire guide frame II and the U-shaped ceramic wire guide frame IV are parallel to each other.

[0117] The pressure sensor I is used to detect the pressure of the filament I on the first U-shaped ceramic piece I in real time. By comparing the pressure setting range with the received pressure value, and based on the comparison result, the displacement of the second U-shaped ceramic piece I is controlled so that the angle between the filament I and the first U-shaped ceramic piece I is 3°, so that the pressure of the filament I on the first U-shaped ceramic piece I is 64.5cN.

[0118] Pressure sensor II is used to detect the pressure of the first U-shaped ceramic component II on the filament II in real time. By comparing the pressure setting range with the received pressure value, and based on the comparison result, the displacement of the second U-shaped ceramic component II is controlled so that the angle between the filament II passing through the first U-shaped ceramic component II and the second U-shaped ceramic component II is 24°, so that the pressure value of the filament II on the first U-shaped ceramic component II is 196cN.

[0119] The final high-fiber, heterogeneous shrinkage polyester filament consists of two bundles of filaments, such as... Figure 2 As shown, the breaking strength decreased significantly twice. This is because the breaking elongation of the two strands is different. This causes the high-fiber heteroshrunk polyester filament to break first when the breaking elongation is 21%, and then break when the breaking elongation is 35%.

Claims

1. A method for preparing high-fiber, heterogeneous shrinkage polyester filament, characterized in that, After the polyester melt is extruded from the spinneret, it is cooled to obtain multiple nascent fibers. These nascent fibers are divided into two equal parts and then pre-bundled through a pre-network to obtain two filament bundles, denoted as filament bundle I and filament bundle II. Fiber bundle I is then stretched and shaped through the first U-shaped ceramic part I, the second U-shaped ceramic part I, the guide hook, rollers I, II, III, IV, and V. At the same time, filament bundle II is stretched and shaped through the first U-shaped ceramic part II, the second U-shaped ceramic part II, the guide hook, rollers I, II, III, IV, and V. Afterward, filament bundles I and II are oiled and twisted together. The twisted filament bundles are then sequentially passed through roller VI, the main network, and roller VII before being wound to form a high-fiber, heterogeneous shrinkage polyester filament. Among them, the opening directions of the first U-shaped ceramic piece I and the second U-shaped ceramic piece I are opposite, and the opening directions of the first U-shaped ceramic piece II and the second U-shaped ceramic piece II are opposite; The pressure sensor I is used to detect the pressure of the wires on the first U-shaped ceramic component I in real time. By comparing the pressure set range with the received pressure value, and based on the comparison result, the second U-shaped ceramic component I is controlled to move, so that the angle of the wire bundle I passing through the first U-shaped ceramic component I and the second U-shaped ceramic component I changes, so that the pressure of the wires on the first U-shaped ceramic component I returns to the set range. Pressure sensor II is used to detect the pressure of the wires on the first U-shaped ceramic component II in real time. By comparing the pressure set range with the received pressure value, and based on the comparison result, the second U-shaped ceramic component II is controlled to move, so that the angle between the wire bundle II passing through the first U-shaped ceramic component II and the second U-shaped ceramic component II changes, so that the pressure of the wires on the first U-shaped ceramic component II returns to the set range. The pressure range of the first U-shaped ceramic component I bearing the filament I is set as interval [a,b], and the pressure range of the first U-shaped ceramic component II bearing the filament II is set as interval [c,d], where c > b; 35cN≤a≤130.5cN, b=1.05a, c=3a, d=1.05c; The number of spinnerets at the spinning station is n; the number of the first U-shaped ceramic part I, the first U-shaped ceramic part II, the second U-shaped ceramic part I, and the second U-shaped ceramic part II are all n. n first-stage U-shaped ceramic pieces I are fixed on U-shaped ceramic wire guide frame I, n first-stage U-shaped ceramic pieces II are fixed on U-shaped ceramic wire guide frame II, n second-stage U-shaped ceramic pieces I are fixed on U-shaped ceramic wire guide frame III, and n second-stage U-shaped ceramic pieces II are fixed on U-shaped ceramic wire guide frame IV. There is a one-to-one correspondence between n first-row U-shaped porcelain pieces I and n second-row U-shaped porcelain pieces I, and a one-to-one correspondence between n first-row U-shaped porcelain pieces II and n second-row U-shaped porcelain pieces II. A pressure sensor I is installed at one end of the U-shaped ceramic wire guide frame I. The pressure sensor I is connected to a control instrument I via a wire. The control instrument I is connected to a servo driver I via a wire. The servo driver I is connected to a servo motor I via a wire. The drive shaft I of the servo motor I is connected to a pinion I. The pinion I meshes with a large gear I. The large gear I is connected to the drive wheel of the conveyor belt I via a connecting rod I. The U-shaped ceramic wire guide frame III is fixed on the belt of the conveyor belt I. When the large gear I rotates, it drives the drive wheel of the conveyor belt I to rotate, and the U-shaped ceramic wire guide frame III on the conveyor belt I moves horizontally. The U-shaped ceramic wire guide frame I and the U-shaped ceramic wire guide frame III are parallel to each other. A pressure sensor II is installed at one end of the U-shaped ceramic wire guide frame II. The pressure sensor II is connected to the control instrument II via a wire. The control instrument II is connected to the servo driver II via a wire. The servo driver II is connected to the servo motor II via a wire. The drive shaft II of the servo motor II is connected to the pinion II. The pinion II meshes with the large gear II. The large gear II is connected to the drive wheel of the conveyor belt II via the connecting rod II. The U-shaped ceramic wire guide frame IV is fixed on the belt of the conveyor belt II. When the large gear II rotates, it drives the drive wheel of the conveyor belt II to rotate, and the U-shaped ceramic wire guide frame IV on the conveyor belt II moves horizontally. The U-shaped ceramic wire guide frame II and the U-shaped ceramic wire guide frame IV are parallel to each other.

2. The method for preparing a high-fiber, heterogeneous shrinkage polyester filament according to claim 1, characterized in that, The angle at which the filament bundle I passes through the first U-shaped ceramic piece I and the second U-shaped ceramic piece I refers to the angle between the filament bundle and the vertical direction between the first U-shaped ceramic piece I and the second U-shaped ceramic piece I; when the second U-shaped ceramic piece I is displaced, the angle at which the filament bundle I passes through the first U-shaped ceramic piece I and the second U-shaped ceramic piece I is 3°~8°. The angle at which the filament bundle II passes through the first U-shaped ceramic piece II and the second U-shaped ceramic piece II refers to the angle between the filament bundle and the vertical direction between the first U-shaped ceramic piece II and the second U-shaped ceramic piece II; when the second U-shaped ceramic piece II is displaced, the angle at which the filament bundle II passes through the first U-shaped ceramic piece II and the second U-shaped ceramic piece II is 20°~30°.

3. The method for preparing a high-fiber, heterogeneous shrinkage polyester filament according to claim 1, characterized in that, When the pressure fed back by pressure sensor I is less than a, the second U-shaped ceramic component I is moved, so that the angle at which the filament passes through the first and second U-shaped ceramic components I increases, until the pressure detected by pressure sensor I is within the range [a, b]. When the pressure fed back by pressure sensor I is greater than b, the second U-shaped ceramic component I is moved, so that the angle at which the filament passes through the first and second U-shaped ceramic components I decreases, until the detected pressure is within the range [a, b]. When the pressure fed back by pressure sensor II is less than c, the second U-shaped ceramic component II is moved, so that the angle between the first and second U-shaped ceramic components II and the wire bundle increases until the pressure detected by pressure sensor II is within the range [c, d]. When the pressure fed back by pressure sensor II is greater than d, the second U-shaped ceramic component II is moved, so that the angle between the first and second U-shaped ceramic components II and the wire bundle decreases until the detected pressure is within the range [c, d].

4. The method for preparing a high-fiber, heterogeneous shrinkage polyester filament according to claim 1, characterized in that, The pre-network pressure is 0.015±0.002MPa, the main network pressure is 0.42~0.45MPa, and the concentration of the oiling agent is 20±1%.

5. The method for preparing a high-fiber, heterogeneous shrinkage polyester filament according to claim 4, characterized in that, Roll speed I is 1700~1850m / min, roll II is 1700~1850m / min, roll III is 1800~1950m / min, roll IV is 4100~4700m / min, roll V is 4100~4700m / min, roll VI is 4110~4710m / min, roll VII is 4115~4720m / min, and the winding speed is 4000~4500m / min.

6. The method for preparing a high-fiber, heterogeneous shrinkage polyester filament according to claim 5, characterized in that, The diameter of the spinneret orifices is 0.14~0.19mm, the roughness of rollers II and III is 0.05~0.1μm, and the roughness of rollers IV and V is 0.9~1.1μm.

7. The method for preparing a high-fiber, heterogeneous shrinkage polyester filament according to claim 6, characterized in that, The specifications of high-fiber heteroshrunk polyester filaments are 60~168dtex / 128~144f; the high-fiber heteroshrunk polyester filaments are composed of two strands, one strand with a breaking elongation of 32~35% and the other strand with a breaking elongation of 20~25%.

Images