A hollow seven-leaf dumbbell-shaped fiber filament preparation device and preparation method

Abstract

The present invention belongs to the field of fiber preparation technology, and relates to a hollow seven-leaf dumbbell-shaped fiber filament preparation device and preparation method. The spinning box of the device is provided with an annular blowing box and a spinneret. The spinneret is provided with a plurality of spinnerets. The spinneret includes a central annular hole, and an annular cavity is formed between the inner and outer rings of the central annular hole. The central annular hole has a notch of a target angle. Seven dumbbell-shaped synapses in an annular array are provided on the outer ring of the central annular hole. The seven dumbbell-shaped synapses are arranged in sequence between the notch starting point and the notch end point of the notch. Each dumbbell-shaped synapse is a hollow structure. The dumbbell-shaped synapse includes a connecting rod and a bell head. One end of the connecting rod is connected to the bell head, and the other end of the connecting rod is connected to the annular cavity. The present application improves the stability of product preparation and improves the fracture resistance and thermal insulation performance of the prepared fiber.

Description

Technical Field

[0001] The invention belongs to the technical field of fiber preparation, and particularly relates to equipment and a method for preparing hollow seven-leaf dumbbell-shaped fiber filaments. Background Art

[0002] In recent years, with the improvement of living standards, people have higher requirements for fabric quality and comfort. Currently, a large number of synthetic fibers such as polyester and acrylic, as well as regenerated fibers such as viscose, are widely used in the textile field. The cross-section of these fibers is usually circular. Due to the shortcomings of general circular cross-section chemical fibers, such as weak surface gloss, waxy feeling, easy to get dirty, easy to pill, non-absorbent and low coverage, the comfort, moisture absorption and breathability of the woven fabrics are not as good as those of fabrics woven from natural fibers such as cotton. Differentiating and functionalizing chemical fibers to improve and obtain ideal wearability has been a long-term research goal.

[0003] Fiber cross-sectional profiling is a feasible design solution. By designing different cross-sectional shapes, the fiber's gloss, bending modulus and other properties can be changed, thereby affecting the fabric's gloss, feel, wear resistance, warmth, moisture absorption and breathability.

[0004] Polyester fiber itself has poor hygroscopicity, and the fabric woven from it is not skin-friendly, and has poor moisture absorption and air permeability. Wearing it will give people a stuffy feeling, and this situation is more significant in the hot summer. At present, there is a design of ordinary cross-shaped fibers. The surface of the cross-shaped fiber has four grooves, which can form a channel for moisture absorption and perspiration. At the same time, the cross-shaped fiber has a larger specific surface area than ordinary round fibers, which increases the contact area with human skin and sweat. Therefore, the fabric of the cross-shaped fiber has good moisture absorption and perspiration performance. However, in the current production process of cross fibers and filaments, the central axis of the cross-shaped spun yarn is thicker than the peripheral horizontal strips, which easily causes uneven cooling, making the strips uneven, so that the strength is uneven and the dyeing is uneven. Therefore, during the drafting process, the cross-shaped fiber easily produces problems such as broken yarn and fuzzy yarn, affecting production efficiency and product quality. Based on this, designing a kind of special-shaped fiber with excellent wearability and good stability has great practical significance and application value. Summary of the Invention

[0005] In order to solve the above technical problems, the present application discloses a hollow seven-leaf dumbbell-shaped fiber filament preparation equipment, including a booster pump, a melt delivery pipeline, a spinning box, a comb-shaped wire guide, an oiling wheel, a drafting device and a winding device which are arranged in sequence based on the preparation process, the spinning box is provided with an annular blowing box and a spinneret, the spinneret is provided with a plurality of spinnerets, the spinneret includes a central annular hole, an annular cavity is formed between the inner ring and the outer ring of the central annular hole, the central annular hole has a notch of a target angle, and seven dumbbell-shaped synapses in an annular array are provided on the outer ring of the central annular hole, the seven dumbbell-shaped synapses are arranged in sequence between the notch starting point and the notch end point of the notch, each of the dumbbell-shaped synapses is a hollow structure, the dumbbell-shaped synapse includes a connecting rod and a bell head, one end of the connecting rod is connected to the bell head, and the other end of the connecting rod is connected to the annular cavity.

[0006] In some embodiments, the annular blowing box is embedded in the spinning beam.

[0007] In some embodiments, the bell head is a circular structure with a radius of R1, the radius of the inner ring of the center ring hole is R2 = 1.6 × R1, the radius of the outer ring of the center ring hole is R3 = 2 × R1, and the length of the connecting rod is S = 1.6 × R1, wherein the range of R1 is 0.01 mm ~ 0.05 mm.

[0008] In some embodiments, the target angle of the notch is 25° to 45°.

[0009] In some embodiments, the inlet of the comb-shaped wire guide is a double-arc structure, the bottom of the comb-shaped wire guide is a circular arc design, the double-arc structure includes a first arc line and a second arc line, the circular arc includes an arc start point and an arc end point, one of the first arc line and the second arc line is connected to the arc start point, and the other one is connected to the arc end point.

[0010] In some embodiments, the diameter a of the arc is 3mm-4mm, the height b of the comb-shaped wire guide is 6mm-8mm, the width c of the comb-shaped wire guide is 4mm-6mm, and the thickness d of the comb-shaped wire guide is 2mm-3mm.

[0011] In some embodiments, the inlet width of the comb-shaped wire guide is determined based on the relative distance between the first arc line and the second arc line, and the minimum distance between the first arc line and the second arc line is determined based on a guide wire width index of the comb-shaped wire guide.

[0012] In some embodiments, at least one of the first arc and the second arc transitions to the arc opening at a sharp angle, and the sharp angle faces the interior of the arc.

[0013] In some embodiments, an inlay groove is provided inside the spinning manifold, and after the ring-blowing bellows is embedded in the inlay groove, a sealing gasket is provided between the bottom of the inlay groove and the ring-blowing bellows.

[0014] According to another aspect of the present application, a method for preparing hollow seven-leaf dumbbell-shaped fiber filaments is also disclosed. The method is prepared and implemented based on the following process flow, which includes: polyester melt → booster pump → melt delivery pipeline → spinning manifold → comb-shaped wire guide → oiling device → drawing device → winding device, wherein a spinneret and a ring-blowing bellows are provided in the spinning manifold, and the ring-blowing bellows, the spinneret is the spinneret structure in the hollow seven-leaf dumbbell-shaped fiber filament preparation equipment as described above, and the ring-blowing bellows is embedded in the ring-blowing bellows.

[0015] The present invention includes but is not limited to the following beneficial effects: (1) This solution increases the specific surface area of ​​the fiber through the composite structure of the seven-leaf dumbbell shape and the hollow ring cavity, thereby increasing the contact area between the fiber and the human skin and sweat. The number of grooves on the longitudinal surface of the fiber is increased, which can form a channel for moisture absorption and perspiration, and can quickly absorb, diffuse and volatilize water by utilizing the capillary effect; (2) The hollow seven-leaf dumbbell-shaped cross-section and the hollow design reduce the thickness of the central axis, thereby reducing the thickness difference of each part and avoiding uneven cooling caused by the excessive bulkiness of the central axis. Under the same cooling conditions, the hollow seven-leaf dumbbell has good cooling uniformity and good strip uniformity, which is conducive to improving the uniformity of subsequent dyeing. The improvement of strip uniformity also reduces (1) The seven-leaf structure increases the static air retention rate between fibers, and with the fluffy support of the bell head, it improves the fiber's thermal insulation coefficient; (2) The dumbbell-shaped connecting rod and the ring cavity are connected to make the stress distribution of the fiber more uniform during stretching, improve the bending resistance, and increase the tensile strength of the fiber; (3) The seven-leaf structure increases the static air retention rate between fibers, and with the fluffy support of the bell head, it improves the fiber's thermal insulation coefficient; (4) The connection design of the dumbbell-shaped connecting rod and the ring cavity makes the stress distribution of the fiber more uniform during stretching, improves the bending resistance, and increases the tensile strength of the fiber; (5) In this solution, the top of the ring-blowing bellows is embedded in the spinning box. This design reduces the gap between the bellows and the spinning box to avoid heat loss, making the temperature and wind pressure of the ring-blowing airflow more uniform, and making the temperature between the spindles in the whole position more uniform. In particular, it can avoid the problem of excessive thermal stress at the end of the spinning position, and the product Dyeing can be more uniform, and product quality is more stable, thereby improving the uniformity and stability of cooling; and embedding the ring-blowing bellows on the top of the spinning box can make the cooling airflow closer to the melt stream extruded by the spinneret, quickly and evenly cooling, reducing the fiber structure differences caused by uneven cooling, improving fiber line density uniformity, strength and other quality indicators, and making the special cross-sectional structure of the hollow seven-leaf dumbbell-shaped fiber more stably formed. Moreover, this embedded layout makes the internal space of the spinning box more reasonably utilized, and there is no need to reserve an independent external installation space for the ring-blowing bellows, making the structure of the entire spinning equipment more compact and space-saving. Compared with the external ring-blowing bellows, the embedded type can reduce the interference of the external environment on the cooling airflow, making the wind speed and wind speed of the ring-blowing wind Temperature, humidity and other parameters are more stable, reducing production failures such as broken yarns caused by air flow fluctuations, and improving production continuity and efficiency; (6) The comb-type yarn guide of this scheme has a double-arc inlet design and a closed arc-top design at the bottom. Compared with the ordinary U-shaped yarn guide, the overall arc design of the comb-type yarn guide of this scheme is conducive to reducing the contact area between the polyester yarn bundle and the yarn guide porcelain, thereby reducing friction, avoiding or reducing the additional tension generated by friction, and reducing the degree of tension fluctuation during the spinning process, thereby improving production stability. On the other hand, the narrow mouth design and sharp corner design of the bottom arc make it difficult for the yarn bundle to slip out of the yarn guide, reducing production problems caused by the yarn bundle slipping out of the yarn guide, and improving production stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments or the prior art.

[0017] Figure 1 A schematic structural diagram of a spinneret structure according to an embodiment of the present invention;

[0018] Figure 2 1 is another structural schematic diagram of the spinneret structure according to an embodiment of the present invention;

[0019] Figure 3 2 is a schematic structural diagram of a spinneret according to an embodiment of the present invention;

[0020] Figure 4 This is a diagram of the expected spinning effect of the spinneret of an embodiment of the present invention;

[0021] Figure 5 1 is a schematic diagram of an embedded assembly structure of a ring-blowing bellows and a spinning manifold according to an embodiment of the present invention from an angle;

[0022] Figure 6 2 is a schematic diagram of the embedded assembly structure of the ring-blowing bellows and the spinning manifold according to another embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of an angle of the sealing structure of the ring blowing box and the spinning box in the prior art;

[0024] Figure 8 It is a structural schematic diagram of a wire guide in the prior art;

[0025] Figure 9 2 is a schematic structural diagram of a comb-shaped wire guide according to an embodiment of the present invention;

[0026] Figure 10 is an enlarged structural schematic diagram of a comb-shaped wire guide according to an embodiment of the present invention;

[0027] In the figure, 1-spinneret, 11-center ring hole, 111-outer ring, 112-inner ring, 113-ring cavity, 114-notch, 2-synapse, 21-connecting rod, 22-bell head, 3-spinning box, 4-ring blowing box, 5-comb-shaped yarn guide, 51-first arc, 52-second arc, 53-circular arc, 54-pointed corner, 6-spinneret, 7-sealing gasket. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] The present application discloses a hollow seven-leaf dumbbell-shaped fiber filament preparation device. Specifically, the device includes a booster pump, a melt delivery pipeline, a spinning box 3, a comb-shaped wire guide 5, an oiling wheel, a drawing device and a winding device which are arranged in sequence based on the preparation process.

[0030] The spinning box 3 is provided with a ring-blowing air box 4 and a spinneret 6. Figures 1 to 3 As shown, a plurality of spinnerets 1 are provided on the spinneret 6, and the spinneret 1 includes a central ring hole 11, and a ring cavity 113 is formed between the inner ring 112 and the outer ring 111 of the central ring hole 11, and the central ring hole 11 has a notch 114 of a target angle, and the outer ring 111 of the central ring hole 11 is provided with seven dumbbell-shaped synapses 2 in a circular array, and the seven dumbbell-shaped synapses 2 are sequentially spaced between the notch starting point of the notch 114 and the notch end point of the notch 114. Each dumbbell-shaped synapse 2 is a hollow structure, and the dumbbell-shaped synapse 2 includes a connecting rod 21 and a bell head 22. One end of the connecting rod 21 is connected to the bell head 22, and the other end of the connecting rod 21 is connected to the ring cavity 113. The spinning effect is shown in the figure. Figure 4 shown. In this solution, the composite structure of the seven-leaf dumbbell shape and the hollow annular cavity 113 increases the specific surface area of ​​the fiber, thereby increasing the contact area between the fiber and human skin and sweat. The number of grooves on the longitudinal surface of the fiber is increased, which can form a channel for moisture absorption and perspiration, and the capillary effect can be used to quickly absorb, diffuse and volatilize water; the hollow seven-leaf dumbbell-shaped cross-section and the hollow design reduce the thickness of the central axis, so that the thickness difference of each part is reduced, and the uneven cooling caused by the excessive bulkiness of the central axis is avoided. Under the same cooling conditions, the hollow seven-leaf dumbbell shape has good cooling uniformity and good yarn uniformity, which is conducive to improving the uniformity of subsequent dyeing. The improvement of yarn uniformity also reduces the occurrence of broken yarns and hairy yarns during the drawing process due to uneven strength, thereby improving the stability of product production; the seven-leaf structure increases the static air retention rate between fibers, and cooperates with the fluffy support of the bell head 22 to improve the thermal insulation coefficient of the fiber; the connection design of the dumbbell-shaped connecting rod 21 and the annular cavity 113 makes the stress distribution of the fiber more uniform during stretching, improves the bending resistance, and improves the tensile strength of the fiber.

[0031] Furthermore, the ring blowing box 4 is embedded in the upper top of the spinning manifold 3. For example, in some embodiments, as Figure 5 and Figure 6 As shown, the interior of the spinning manifold 3 is provided with an inlay groove, after which the ring-blowing bellows 4 is embedded in the inlay groove, a sealing gasket 7 is provided between the bottom of the inlay groove and the ring-blowing bellows 4. Figure 7In the spinning box 3 structure of the prior art shown, the top of the ring-blowing bellows 4 is embedded in the spinning box 3. This design reduces the gap between the bellows and the spinning box 3, reduces heat loss, makes the temperature and wind pressure of the ring-blowing airflow more uniform, and makes the temperature between the spindles in the entire position more uniform. In particular, it can avoid the problem of excessive thermal stress at the end spindles at both ends of the spinning position, and the product dyeing can be more uniform, the product quality is more stable, thereby improving the uniformity and stability of cooling; and embedding the ring-blowing bellows 4 in the spinning box 3 can make the cooling airflow closer to the melt stream extruded by the spinneret 6, quickly and evenly cool it, and reduce the fiber damage caused by uneven cooling. The dimensional structure difference improves the quality indicators such as fiber line density uniformity and strength, and makes the special cross-sectional structure of the hollow seven-leaf dumbbell-shaped fiber more stably formed. Moreover, this embedded layout makes the internal space of the spinning box 3 more reasonably utilized, and there is no need to reserve an independent external installation space for the ring-blowing bellows 4, making the structure of the entire spinning equipment more compact and space-saving. Compared with the external ring-blowing bellows 4, the embedded type can reduce the interference of the external environment on the cooling airflow, making the parameters such as the wind speed, wind temperature, and wind humidity of the ring-blowing air more stable, reducing production failures such as broken wires caused by airflow fluctuations, improving production continuity and efficiency, and further improving the sealing effect through the sealing gasket 7.

[0032] In some embodiments, continue to refer to Figure 3 The bell head 22 is a circular structure with a radius of R1, the radius of the inner ring 112 of the center ring hole 11 is R2=1.6×R1, the radius of the outer ring 111 of the center ring hole 11 is R3=2×R1, and the length S of the connecting rod 21 is S=1.6×R1, where R1 ranges from 0.01mm to 0.05mm.

[0033] In some embodiments, the target angle of the notch 114 is 25° to 45°.

[0034] In some embodiments, as Figure 9 and Figure 10The inlet of the comb-shaped wire guide 5 of the present application is a double-arc structure, and the bottom of the comb-shaped wire guide 5 is designed as an arc 53. The double-arc structure includes a first arc line 51 and a second arc line 52. The arc 53 includes an arc start point and an arc end point. One of the first arc line 51 and the second arc line 52 is connected to the arc start point, and the other is connected to the arc end point. In some embodiments, the diameter a of the arc 53 is 3mm-4mm, the height b of the comb-shaped wire guide 5 is 6mm-8mm, the width c of the comb-shaped wire guide 5 is 4mm-6mm, and the thickness d of the comb-shaped wire guide 5 is 2mm-3mm. In some embodiments, the inlet width of the comb-shaped wire guide 5 is determined based on the relative distance between the first arc line 51 and the second arc line 52, and the minimum spacing between the first arc line 51 and the second arc line 52 is determined based on the guide wire width index of the comb-shaped wire guide 5. In some embodiments, at least one of the first arc 51 and the second arc 52 transitions to the arc opening with a sharp corner 54, and the sharp corner 54 faces the inside of the arc 53. In this exemplary embodiment, the comb-type wire guide of this embodiment has a double-arc entrance design, and the bottom adopts a closed design with the top of the arc 53. Figure 8 The U-shaped yarn guide shown in the figure, the overall arc design of the comb-type yarn guide of this scheme is conducive to reducing the contact area between the polyester yarn bundle and the yarn guide porcelain, thereby reducing friction, avoiding or reducing the additional tension generated by friction, and reducing the fluctuation degree of tension during the spinning process, thereby improving production stability. On the other hand, the narrow mouth design of the bottom arc 53 and the sharp corner design 54 make it difficult for the yarn bundle to slip out of the yarn guide, reducing production problems caused by the yarn bundle slipping out of the yarn guide, and improving production stability.

[0035] According to another aspect of the present application, a method for preparing hollow seven-leaf dumbbell-shaped fiber filaments is also disclosed. The method is prepared and implemented based on the following process flow, which includes: polyester melt → booster pump → melt delivery pipeline → spinning box 3 → comb-shaped wire guide 5 → oiling device → drawing device → winding device, wherein a spinneret 6 and a ring-shaped blowing bellows 4 are provided in the spinning box 3, and the ring-shaped blowing bellows 4, the spinneret 6 is the spinneret 6 structure in the hollow seven-leaf dumbbell-shaped fiber filament preparation equipment as mentioned above, and the ring-shaped blowing bellows 4 is embedded in the ring-shaped blowing bellows 4.

[0036] Specifically, for a better understanding, the preparation of hollow seven-leaf dumbbell-shaped fiber filaments and the overall process flow of the preparation of hollow seven-leaf dumbbell-shaped fiber filaments are illustrated as follows.

[0037] Example 1

[0038] The production process primarily involves the following: polyester melt → booster pump → melt delivery pipeline → spinning manifold 3 → comb-shaped guide 5 → oiling device → drafting device → winding device. The spinning manifold 3 is equipped with a metering pump, spinning assembly, spinneret 6, and annular blower 4. After the spinning manifold 3 is introduced, the process unfolds as follows: polyester melt → booster pump → melt delivery pipeline → spinning manifold 3 → metering pump → spinning assembly → spinneret 6 → annular blower 4 → comb-shaped guide 5 → oiling device → drafting device → winding device. Specifically, terephthalic acid and ethylene glycol are first converted into PET melt (polyester melt) through an esterification and polycondensation reaction. The polyester melt is then pumped by a booster pump into the melt delivery pipeline, which then delivers it to the spinning manifold 3. Within the spinning manifold 3, the melt is precisely controlled by a metering pump and then passes through the spinning assembly containing the aforementioned spinneret 6 structure to form fibers. The fibers cool and solidify under the cooling effect of the annular blower 4, which prevents air flow from affecting fiber formation. The fibers then pass through the comb-shaped yarn guide 5 and enter the oiling device for oiling to enhance smoothness. The fibers are then stretched and shaped by the drafting device before being wound into a yarn cake in the winding device, completing the spinning process.

[0039] Specifically, the spinneret 6 is a circular structure, on which multiple annular spinnerets are formed, and each annular spinneret layer is provided with multiple spinneret holes 1 at intervals. Figure 1 As shown, there are four spinneret layers, and from the inside to the outside, 7, 14, 23 and 28 spinneret holes 1 are respectively provided on the four spinneret layers.

[0040] Among them, R1 is 0.01 mm, the target angle of the notch 114 is 25°, the diameter a of the arc 53 of the comb-shaped wire guide 5 is 3 mm, the height b is 6 mm, the width c is 4 mm, and the thickness d is 2 mm.

[0041] During the preparation process, the intrinsic viscosity of the PET melt is controlled to be 0.65-0.68dl / g, the terminal carboxyl content is ≤28mol / t, the impurity particle size is ≤20μm, and the moisture content is ≤0.05%.

[0042] The box temperature is controlled in the range of 290℃-293℃, the height of the windless zone is 45mm-75mm, the annular air cooling pressure is between 35Pa-48Pa, the network pressure is between 0.5-0.9Mpa, and the spinning speed is between 2500m / min-2900m / min.

[0043] The hollow seven-leaf dumbbell-shaped fiber monofilament produced by the process has a fineness of 3.18D, a linear density deviation rate of 0.29%, an elongation at break of 124%, a cv value of elongation at break of 2.7%, a breaking strength of 2.3cN / dtex, a cv value of breaking strength of 2.2%, and an oil content of 0.4%.

[0044] Example 2

[0045] The production process primarily involves the following: polyester melt → booster pump → melt delivery pipeline → spinning manifold 3 → comb-shaped guide 5 → oiling device → drafting device → winding device. The spinning manifold 3 is equipped with a metering pump, spinning assembly, spinneret 6, and annular blower 4. After the spinning manifold 3 is introduced, the process unfolds as follows: polyester melt → booster pump → melt delivery pipeline → spinning manifold 3 → metering pump → spinning assembly → spinneret 6 → annular blower 4 → comb-shaped guide 5 → oiling device → drafting device → winding device. Specifically, terephthalic acid and ethylene glycol are first converted into PET melt (polyester melt) through an esterification and polycondensation reaction. The polyester melt is then pumped by a booster pump into the melt delivery pipeline, which then delivers it to the spinning manifold 3. Within the spinning manifold 3, the melt is precisely controlled by a metering pump and then passes through the spinning assembly containing the aforementioned spinneret 6 structure to form fibers. The fibers cool and solidify under the cooling effect of the annular blower 4, which prevents air flow from affecting fiber formation. The fibers then pass through the comb-shaped yarn guide 5 and enter the oiling device for oiling to enhance smoothness. The fibers are then stretched and shaped by the drafting device before being wound into a yarn cake in the winding device, completing the spinning process.

[0046] Specifically, the spinneret 6 is a circular structure, on which multiple annular spinnerets are formed, and each annular spinneret layer is provided with multiple spinneret holes 1 at intervals. Figure 2 As shown, there are three spinneret layers, and 14, 23 and 28 spinneret holes 1 are respectively provided on the three spinneret layers from the inside to the outside.

[0047] Among them, R1 is 0.05 mm, the target angle of the notch 114 is 45°, the diameter a of the arc 53 of the comb-shaped wire guide 5 is 4 mm, the height b is 8 mm, the width c is 6 mm, and the thickness d is 3 mm.

[0048] During the preparation process, the intrinsic viscosity of the PET melt is 0.65-0.68dl / g, the terminal carboxyl content is ≤28mol / t, the impurity particle size is ≤20μm, and the moisture content is ≤0.05%;

[0049] The box temperature is in the range of 290℃-293℃, the height of the windless zone is 45mm-75mm, the annular air cooling pressure is between 25Pa-40Pa, the network pressure is between 0.5-0.9Mpa, and the spinning speed is between 2500m / min--2800m / min;

[0050] The final fiber monofilament produced by the process has a fineness of 2.12D, a linear density deviation rate of 0.27%, an elongation at break of 121%, a cv value of elongation at break of 2.8%, a breaking strength of 2.5 cN / dtex, a cv value of breaking strength of 2.3%, and an oil content of 0.42%.

[0051] Example 3

[0052] The production process primarily involves the following: polyester melt → booster pump → melt delivery pipeline → spinning manifold 3 → comb-shaped guide 5 → oiling device → drafting device → winding device. The spinning manifold 3 is equipped with a metering pump, spinning assembly, spinneret 6, and annular blower 4. After the spinning manifold 3 is introduced, the process unfolds as follows: polyester melt → booster pump → melt delivery pipeline → spinning manifold 3 → metering pump → spinning assembly → spinneret 6 → annular blower 4 → comb-shaped guide 5 → oiling device → drafting device → winding device. Specifically, terephthalic acid and ethylene glycol are first converted into PET melt (polyester melt) through an esterification and polycondensation reaction. The polyester melt is then pumped by a booster pump into the melt delivery pipeline, which then delivers it to the spinning manifold 3. Within the spinning manifold 3, the melt is precisely controlled by a metering pump and then passes through the spinning assembly containing the aforementioned spinneret 6 structure to form fibers. The fibers cool and solidify under the cooling effect of the annular blower 4, which prevents air flow from affecting fiber formation. The fibers then pass through the comb-shaped yarn guide 5 and enter the oiling device for oiling to enhance smoothness. The fibers are then stretched and shaped by the drafting device before being wound into a yarn cake in the winding device, completing the spinning process.

[0053] Specifically, the spinneret 6 is a circular structure, on which multiple annular spinnerets are formed, and each annular spinneret layer is provided with multiple spinneret holes 1 at intervals. Figure 2 As shown, there are three spinneret layers, and 14, 23 and 28 spinneret holes 1 are respectively provided on the three spinneret layers from the inside to the outside.

[0054] Among them, R1 is 0.05 mm, the target angle of the notch 114 is 45°, the diameter a of the arc 53 of the comb-shaped wire guide 5 is 4 mm, the height b is 8 mm, the width c is 6 mm, and the thickness d is 3 mm.

[0055] During the preparation process, the intrinsic viscosity of the PET melt is 0.65-0.68dl / g, the terminal carboxyl content is ≤28mol / t, the impurity particle size is ≤20μm, and the moisture content is ≤0.05%;

[0056] The box temperature is in the range of 291℃-293℃, the height of the windless zone is 45mm-75mm, the annular air cooling pressure is between 20Pa-37Pa, the network pressure is between 0.5-0.9Mpa, and the spinning speed is between 2500m / min--2800m / min;

[0057] The final fiber monofilament produced by the process has a fineness of 1.57D, a linear density deviation rate of 0.29%, an elongation at break of 118%, a cv value of elongation at break of 2.6%, a breaking strength of 2.45 cN / dtex, a cv value of breaking strength of 2.4%, and an oil content of 0.43%.

[0058] Example 4

[0059] The production process primarily involves the following: polyester melt → booster pump → melt delivery pipeline → spinning manifold 3 → comb-shaped guide 5 → oiling device → drafting device → winding device. The spinning manifold 3 is equipped with a metering pump, spinning assembly, spinneret 6, and annular blower 4. After the spinning manifold 3 is introduced, the process unfolds as follows: polyester melt → booster pump → melt delivery pipeline → spinning manifold 3 → metering pump → spinning assembly → spinneret 6 → annular blower 4 → comb-shaped guide 5 → oiling device → drafting device → winding device. Specifically, terephthalic acid and ethylene glycol are first converted into PET melt (polyester melt) through an esterification and polycondensation reaction. The polyester melt is then pumped by a booster pump into the melt delivery pipeline, which then delivers it to the spinning manifold 3. Within the spinning manifold 3, the melt is precisely controlled by a metering pump and then passes through the spinning assembly containing the aforementioned spinneret 6 structure to form fibers. The fibers cool and solidify under the cooling effect of the annular blower 4, which prevents air flow from affecting fiber formation. The fibers then pass through the comb-shaped yarn guide 5 and enter the oiling device for oiling to enhance smoothness. The fibers are then stretched and shaped by the drafting device before being wound into a yarn cake in the winding device, completing the spinning process.

[0060] Specifically, the spinneret 6 is a circular structure, on which multiple annular spinnerets are formed, and each annular spinneret layer is provided with multiple spinneret holes 1 at intervals. Figure 2 As shown, there are three spinneret layers, and 14, 23 and 28 spinneret holes 1 are respectively provided on the three spinneret layers from the inside to the outside.

[0061] Among them, R1 is 0.05 mm, the target angle of the notch 114 is 45°, the diameter a of the arc 53 of the comb-shaped wire guide 5 is 4 mm, the height b is 8 mm, the width c is 6 mm, and the thickness d is 3 mm.

[0062] During the preparation process, the intrinsic viscosity of the PET melt is 0.65-0.68dl / g, the terminal carboxyl content is ≤28mol / t, the impurity particle size is ≤20μm, and the moisture content is ≤0.05%;

[0063] The box temperature is in the range of 291℃-293℃, the height of the windless zone is 45mm-75mm, the annular air cooling pressure is between 15Pa-30Pa, the network pressure is between 0.4-0.6Mpa, and the spinning speed is between 2400m / min--2700m / min;

[0064] The final fiber monofilament produced by the process has a fineness of 1.1D, a linear density deviation rate of 0.32%, an elongation at break of 113%, a cv value of elongation at break of 2.7%, a breaking strength of 2.74 cN / dtex, a cv value of breaking strength of 2.5%, and an oil content of 0.47%.

[0065] Example 5

[0066] The production process primarily involves the following: polyester melt → booster pump → melt delivery pipeline → spinning manifold 3 → comb-shaped guide 5 → oiling device → drafting device → winding device. The spinning manifold 3 is equipped with a metering pump, spinning assembly, spinneret 6, and annular blower 4. After the spinning manifold 3 is introduced, the process unfolds as follows: polyester melt → booster pump → melt delivery pipeline → spinning manifold 3 → metering pump → spinning assembly → spinneret 6 → annular blower 4 → comb-shaped guide 5 → oiling device → drafting device → winding device. Specifically, terephthalic acid and ethylene glycol are first converted into PET melt (polyester melt) through an esterification and polycondensation reaction. The polyester melt is then pumped by a booster pump into the melt delivery pipeline, which then delivers it to the spinning manifold 3. Within the spinning manifold 3, the melt is precisely controlled by a metering pump and then passes through the spinning assembly containing the aforementioned spinneret 6 structure to form fibers. The fibers cool and solidify under the cooling effect of the annular blower 4, which prevents air flow from affecting fiber formation. The fibers then pass through the comb-shaped yarn guide 5 and enter the oiling device for oiling to enhance smoothness. The fibers are then stretched and shaped by the drafting device before being wound into a yarn cake in the winding device, completing the spinning process.

[0067] Specifically, the spinneret 6 is a circular structure, on which multiple annular spinnerets are formed, and each annular spinneret layer is provided with multiple spinneret holes 1 at intervals. Figure 2 As shown, there are three spinneret layers, and 14, 23 and 28 spinneret holes 1 are respectively provided on the three spinneret layers from the inside to the outside.

[0068] Among them, R1 is 0.05 mm, the target angle of the notch 114 is 45°, the diameter a of the arc 53 of the comb-shaped wire guide 5 is 4 mm, the height b is 8 mm, the width c is 6 mm, and the thickness d is 3 mm.

[0069] During the preparation process, the intrinsic viscosity of the PET melt is 0.65-0.68dl / g, the terminal carboxyl content is ≤28mol / t, the impurity particle size is ≤20μm, and the moisture content is ≤0.05%;

[0070] The box temperature is in the range of 291℃-293℃, the height of the windless zone is 45mm-75mm, the annular air cooling pressure is between 8Pa-18Pa, the network pressure is between 0.4-0.6Mpa, and the spinning speed is between 2200m / min--2400m / min;

[0071] The final fiber monofilament produced by the process has a fineness of 0.8D, a linear density deviation rate of 0.29%, an elongation at break of 110%, a cv value of elongation at break of 2.8%, a breaking strength of 2.84 cN / dtex, a cv value of breaking strength of 2.6%, and an oil content of 0.51%.

[0072] Furthermore, the properties of the fibers formed by the spinneret 6 structure of this solution were tested as follows:

[0073] The test standards and methods involved in the present invention are as follows:

[0074] (1) Linear density deviation rate: The linear density deviation rate of high-quality hollow seven-leaf dumbbell-shaped fiber filaments is tested using the method (actual linear density - theoretical linear density) / theoretical linear density * 100% in GB / T14343 Test method for linear density of chemical fiber filaments;

[0075] (2) Breaking strength: According to GB / T14343 Test method for tensile properties of chemical fiber filaments, the fiber is pulled to break using a Swiss Uster-IV tensile tester under uniform tension at a constant speed, and the breaking strength of the sample is obtained from the data display;

[0076] (3) Breaking strength CV: According to GB / T14343 Test method for tensile properties of chemical fiber filaments, the fiber is pulled to break using a Swiss Uster-IV tensile tester under uniform tension at a constant speed, and the breaking strength CV of the sample is obtained from the data display;

[0077] (4) Elongation at break: According to GB / T14343 Test method for tensile properties of chemical fiber filaments, the fiber is pulled to break using a Swiss Uster-IV tensile tester under uniform tension at a constant speed, and the elongation at break of the sample is obtained from the data display;

[0078] (5) Elongation at break CV: According to GB / T8960-2015 Polyester Drawn Yarn, the fiber was pulled to break using a Swiss Uster-IV tensile tester under uniform tension at a constant speed, and the elongation at break CV of the sample was obtained from the data display;

[0079] (6) Sliver unevenness: GB / T8960-2015 Polyester Drawn Yarn, measured using the Uster-Ⅳ sliver evenness meter. When the yarn passes through the air capacitor composed of two parallel metal plates at the detection point, the change in the yarn weight per unit length causes a corresponding change in capacitance. The rate of change in capacitance is linearly related to the change in yarn weight between the detection capacitor plates. The unevenness is displayed by an automatic integrator, thereby obtaining the sliver unevenness of high-quality hollow seven-leaf dumbbell-shaped fiber filaments.

[0080] (7) Oiling rate: GB / T8960-2015 Polyester Drawn Yarn adopts a nuclear magnetic resonance fiber oiling rate tester. According to the nuclear magnetic resonance method, a section of fiber is selected to test the oiling rate of high-quality hollow seven-leaf dumbbell-shaped fiber filaments.

[0081] (8) Thermal stress: According to FZ / T50051-2020 "Test method for dynamic thermal stress of polyester pre-oriented yarn", the SG635 fully automatic filament thermal stress tester is used under set conditions. The sample passes through the heating device and the drawing device at a certain speed and constant pre-tension, so that the sample undergoes a certain proportion of drawing under heating conditions. The dynamic thermal stress of the sample during the drawing process is tested, and the average value, maximum value, minimum value and cv value of the thermal stress are automatically calculated by the computer. These indicators can directly reflect the dyeing performance of the subsequent DTY.

[0082] After testing, the performance indicators of the hollow seven-leaf dumbbell-shaped fiber prepared based on this scheme are as follows:

[0083] The single yarn fineness is in the range of 0.27-3.18D, the linear density deviation rate is ≤1.0%, the breaking strength CV≤3.0%, the breaking strength ≥2.1cN / dtex, the breaking elongation is 110%-128%, the breaking elongation CV≤3.5%, the yarn unevenness rate ≤0.9%, the dynamic thermal stress cv value of the pre-oriented yarn ≤2.0%, and the oil content is 0.43±0.2%.

[0084] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0085] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A hollow seven-leaf dumbbell-shaped fiber filament preparation device, comprising a booster pump, a melt delivery pipeline, a spinning box (3), a comb-shaped wire guide (5), an oiling wheel, a drafting device and a winding device arranged in sequence based on the preparation process, characterized in that: The spinning box (3) is provided with a ring-blowing air box (4) and a spinneret (6), and the spinneret (6) is provided with a plurality of spinneret holes (1), and the spinneret holes (1) include a central ring hole (11), and an annular cavity (113) is formed between an inner ring (112) and an outer ring (111) of the central ring hole (11), and the central ring hole (11) has a notch (114) of a target angle, and an annular cavity (113) is formed on the outer ring (111) of the central ring hole (11). Seven dumbbell-shaped synapses (2) in a shaped array, the seven dumbbell-shaped synapses (2) are sequentially spaced between the starting point of the notch (114) and the end point of the notch (114), each dumbbell-shaped synapse (2) is a hollow structure, the dumbbell-shaped synapse (2) comprises a connecting rod (21) and a bell head (22), one end of the connecting rod (21) is connected to the bell head (22), and the other end of the connecting rod (21) is connected to the annular cavity (113); The bell head (22) is a circular structure with a radius of R1, the radius of the inner ring (112) of the central ring hole (11) is R2=1.6×R1, the radius of the outer ring (111) of the central ring hole (11) is R3=2×R1, and the length of the connecting rod (21) is S=1.6×R1, wherein the range of R1 is 0.01mm~0.05mm; The target angle of the notch (114) is 25° to 45°.

2. The hollow seven-leaf dumbbell-shaped fiber filament preparation device according to claim 1, characterized in that: The annular blowing box (4) is embedded in the spinning box body (3).

3. The hollow seven-leaf dumbbell-shaped fiber filament preparation device according to claim 1, characterized in that: The inlet of the comb-shaped wire guide (5) is a double-arc structure, and the bottom of the comb-shaped wire guide (5) is designed as a circular arc (53). The double-arc structure includes a first arc line (51) and a second arc line (52). The circular arc (53) includes an arc start point and an arc end point. One of the first arc line (51) and the second arc line (52) is connected to the arc start point, and the other one is connected to the arc end point.

4. The hollow seven-leaf dumbbell-shaped fiber filament preparation device according to claim 3, characterized in that: The diameter a of the circular arc (53) is 3 mm to 4 mm, the height b of the comb-shaped wire guide (5) is 6 mm to 8 mm, the width c of the comb-shaped wire guide (5) is 4 mm to 6 mm, and the thickness d of the comb-shaped wire guide (5) is 2 mm to 3 mm.

5. The hollow seven-leaf dumbbell-shaped fiber filament preparation device according to claim 4, characterized in that: The inlet width of the comb-shaped wire guide (5) is determined based on the relative distance between the first arc (51) and the second arc (52), and the minimum spacing between the first arc (51) and the second arc (52) is determined based on the guide wire width index of the comb-shaped wire guide (5).

6. The hollow seven-leaf dumbbell-shaped fiber filament preparation device according to claim 3 or 5, characterized in that: At least one of the first arc line (51) and the second arc line (52) transitions to the arc opening at a sharp angle (54), and the direction of the sharp angle (54) faces the inside of the circular arc (53).

7. The hollow seven-leaf dumbbell-shaped fiber filament preparation device according to claim 2, characterized in that: An inlay groove is provided inside the spinning box (3), and after the annular blowing box (4) is embedded in the inlay groove, a sealing gasket (7) is provided between the bottom of the inlay groove and the annular blowing box (4).

8. A method for preparing hollow seven-leaf dumbbell-shaped fiber filaments, characterized in that: The method is prepared and implemented based on the following process flow, which includes: polyester melt → booster pump → melt delivery pipeline → spinning manifold (3) → comb-shaped yarn guide (5) → oiling device → drawing device → winding device, wherein a spinneret (6) and a ring-blowing bellows (4) are provided in the spinning manifold (3), and the ring-blowing bellows (4) and the spinneret (6) are the spinneret (6) structure in the hollow seven-leaf dumbbell-shaped fiber filament preparation equipment according to any one of claims 1 to 7, and the ring-blowing bellows (4) are embedded in the ring-blowing bellows (4).

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