Spinneret plate and method for preparing super-imitation cotton polyester fiber by using spinneret plate

Abstract

The invention relates to the technical field of spinning production, and discloses a spinneret plate and a method for preparing super-imitation cotton polyester fibers by using the spinneret plate, and the method comprises the following steps: carrying out melt direct spinning or melt spinning on a polyester material, and sequentially carrying out spinneret plate spinning and side blowing cooling to prepare the super-imitation cotton polyester fibers; the spinneret plate is provided with a plurality of spinneret orifices, and each spinneret orifice is composed of 2-4 toothed arc holes arranged at intervals. The toothed arc holes are of a structure that tooth-shaped holes are evenly distributed in the periphery of the arc holes, and the arc holes are communicated with the tooth-shaped holes. According to the invention, the toothed arc-shaped holes are used as the spinneret orifices, and the cross air blowing process is matched, so that the polyester fiber with a hollow structure and multiple grooves in the surface is obtained through spinning, and the polyester fiber has an excellent cotton-like effect; the obtained fiber not only has the excellent performances of pilling resistance, deformation resistance and the like of polyester, but also has the warm keeping, air permeability and wet permeability of cotton fiber, and has excellent strength and elasticity.

Description

Technical Field

[0001] The invention relates to the technical field of spinning production, in particular to a spinneret and a method for preparing super-cotton-like polyester fibers by using the spinneret. Background Art

[0002] Cotton fiber is a seed fiber formed by the elongation and thickening of the epidermal cells of the fertilized ovule. Unlike general bast fibers, cotton fiber is mainly composed of cellulose. From a microscopic perspective, the cross section of cotton fiber consists of many concentric layers, mainly primary layer, secondary layer, and middle cavity. It is a porous structure, and there are many spiral twists on the flat ribbon fibers. From a performance perspective, the strength of cotton fiber is 3.5-6cN, and the strength of a single cotton fiber varies greatly. The elongation at break of cotton fiber is 3%-7%, and the elasticity is poor, so it is easy to deform when making clothes. The moisture regain of cotton fiber can reach about 8.5%. The shrinkage rate is relatively large, about 4-10%. It is alkali-resistant but not acid-resistant, and has average light and heat resistance, and good hygienic properties.

[0003] The strength of polyester fiber is 3.5-5cN, the elongation at break is 20%-30%, and the moisture regain is 0.4%. Therefore, compared with cotton fiber clothing, polyester fiber has good elasticity, good washability, and is not easy to deform, but it is not as warm and breathable as cotton fiber. In the prior art, polyester fiber is often used to improve the process to make it have a cotton-like effect. However, the cotton-like effect produced by polyester fiber can only imitate some functional characteristics of cotton fiber, and there are technical defects such as the natural bending function is not obvious, or the warming function is not obvious, or the natural cotton feeling function is not very prominent, or the cost is too high.

[0004] The Chinese utility model patent with publication number CN 211999999 U discloses a hollow gear cross-section fiber spinneret, including a spinneret body, a plurality of spinneret holes are arranged on the spinneret body, the spinneret holes include a feed hole, a material passage and a discharge hole connected in sequence from top to bottom, the discharge hole includes a plurality of long strip through holes, the extension lines of the central axis of each long strip through hole intersect at one point, and the angles between any two adjacent long strip through holes are the same. First, the effect of the silk produced by the spinneret can achieve a velvet-like effect, that is, it has a high fluffiness, but in fact no relevant experimental data is given to prove it. Secondly, in the process of spinning with the above-mentioned spinneret, in order to form a hollow structure inside the fiber, more points of melt expansion and adhesion are required, and it is difficult to make all of them adhere, the actual yield is low, the fiber strength is also affected, and the actual cotton-like effect is poor. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a spinneret and a method for preparing super-cotton-like polyester fiber using the spinneret. By using toothed arc holes as spinneret holes, the fibers are given sufficient mechanical strength and elasticity while maintaining sufficient fiber hollowness and surface groove structure, so that the polyester fibers have a better cotton-like effect.

[0006] The purpose of the present invention is achieved through the following technical solutions: In the first aspect, the present invention provides a spinneret having a plurality of spinneret holes; the spinneret holes are composed of 2 to 4 toothed arc holes arranged at intervals; the toothed arc holes are structures in which tooth-shaped holes are evenly distributed on the periphery of the arc holes and the arc holes are connected to the tooth-shaped holes.

[0007] The specially designed spinneret in the present invention is composed of two or more toothed arc holes arranged at intervals. The toothed arc holes are structures in which tooth-shaped holes are evenly distributed on the periphery of the arc holes and the arc holes are connected to the tooth-shaped holes. The melt is ejected from the tooth-shaped holes and the arc holes together. Due to the expansion of the melt after ejection, the melt ejected from different arc holes will produce adhesion, thereby forming a certain hollow structure inside the fiber. At the same time, the melt ejected from different tooth-shaped holes will also expand and form adhesion near the bottom edge of the arc hole. Relying on the support formed by the melt in the arc hole, an overall structure is formed, and the fiber is given sufficient mechanical strength and elasticity.

[0008] Preferably, each toothed circular arc hole is provided with no more than 4 tooth-shaped holes; the tooth-shaped holes are long strip-shaped openings; the opening width of the tooth-shaped holes is 0.08-0.15 mm, and the length is 0.3-0.6 mm.

[0009] Preferably, the angle between the center lines of adjacent tooth-shaped holes is 30-60°.

[0010] The angle between the center lines of adjacent tooth-shaped holes includes the angle between adjacent tooth-shaped holes on each toothed arc hole and the angle between adjacent tooth-shaped holes on adjacent toothed arc holes. More preferably, the angle between adjacent tooth-shaped holes on each toothed arc hole is equal to the angle between adjacent tooth-shaped holes on adjacent toothed arc holes.

[0011] Preferably, the outer radius of the arc hole is 0.3-0.5 mm, and the inner radius is 0.1-0.25 mm.

[0012] Preferably, the width of the narrow gap between adjacent arc holes is 0.04-0.2 mm.

[0013] In a second aspect, the present invention provides a method for preparing super imitation cotton polyester fiber using a spinneret, comprising the following steps: spinning the polyester material through the spinneret by melt direct spinning or melt spinning, and then cooling by side blowing to obtain the super imitation cotton polyester fiber.

[0014] The melt is directly spun or melt-spinned, and the melt passes through a static mixer, a metering pump, a specially designed spinneret hole, side-blowing cooling, oiling, and winding to obtain superspun cotton polyester fiber.

[0015] The specially designed spinneret holes are combined with side-blowing cooling, so that the surface of one side of the silk is different from the other side due to orientation, crystallinity, and internal stress, which makes the surface tooth-shaped melt produce a certain axial torque, so that the surface forms a natural twist similar to cotton fiber, which can also reduce the surface hair of the fiber and improve the yield rate. In addition, the fiber surface formed after the melt ejected from the tooth-shaped hole generates torque can form multiple open spiral guide holes, which can not only drain moisture and allow air to pass through, but also achieve lightweight fiber. At the same time, since the melt ejected from the arc hole will first form a hollow structure inside the fiber, and when the outer tooth-shaped structure is cooled by side-blowing air, the torque formed on one side will cause the internal hollow to form an irregular middle cavity structure, which is more similar to the cross-section of mature cotton fiber and has a better cotton-like effect.

[0016] Therefore, the fiber of the present invention has the excellent properties of polyester such as anti-pilling and anti-deformation, and also has the warmth retention, air permeability and moisture conductivity of cotton fiber, and has excellent strength and elasticity.

[0017] Preferably, the spinning box temperature is 280-285°C.

[0018] Preferably, the wind speed of the side-blowing cooling is 0.6-0.7 m / s and the temperature is 19-22°C.

[0019] Preferably, the filament bundle after side-blowing cooling is oiled and wound to obtain the super-cotton-like polyester fiber.

[0020] Preferably, the oiling rate of the oiling is 0.75-0.85%; the winding speed of the winding is 4000-4500 m / min.

[0021] This low box temperature, high spinning speed and no high-temperature stretching and shaping breaks the conventional polyester production process and produces a super cotton-like polyester fiber.

[0022] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention adopts a toothed arc hole as a spinneret hole, and cooperates with a side blowing process to spin a polyester fiber with a hollow structure and multiple grooves on the surface, which has an excellent cotton-like effect; (2) The fiber of the present invention has the excellent properties of polyester such as anti-pilling and anti-deformation, and also has the warmth retention, air permeability and moisture conductivity of cotton fiber, and has excellent strength and elasticity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1Schematic diagram of the structure of the spinneret hole I in the present invention (the spinneret hole is composed of two toothed arc holes arranged at intervals); Figure 2 Schematic diagram of the structure of the spinneret II in the present invention (the spinneret is composed of three toothed arc holes arranged at intervals); Figure 3 Schematic diagram of the structure of the spinneret III in the present invention (the spinneret is composed of four toothed arc holes arranged at intervals); Figure 4 This is a cross-sectional view of the fiber spun from spinneret hole Ⅰ in the present invention.

[0024] The accompanying drawings are marked as follows: 1. tooth-shaped hole, 2. arc-shaped hole, 3. narrow gap between adjacent arc holes, 4. angle between the center lines of adjacent toothed arc holes. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is described below with specific embodiments, but the protection scope of the present invention is not limited thereto: The preparation of super imitation cotton polyester fiber comprises the following steps: Step 1: Spin the polyester material (with an intrinsic viscosity of 0.6 to 0.8 dl / g) through a spinneret by melt direct spinning or melt spinning at a spinning box temperature of 280 to 285°C; specifically, the spinneret is composed of two or more toothed arc holes arranged at intervals, and the toothed arc hole is a structure in which a plurality of tooth-shaped holes are evenly distributed on the periphery of the arc hole and the arc holes are connected to the tooth-shaped holes; each arc hole is a part of the same annular hole, and its outer radius is 0.3 to 0.5 mm, and its inner radius is 0.10 to 0. The diameter of the toothed hole is 25mm, the width of the narrow slit between adjacent arc holes (the vertical width is calculated by the narrow slit between the arcs where the outer radius of the arc hole is located) is 0.04-0.2mm, the tooth-shaped hole is a long strip opening, the opening width of the tooth-shaped hole is 0.08-0.15mm, the length is 0.3-0.6mm, and the angle between the center lines of adjacent tooth-shaped holes (including the angle between adjacent tooth-shaped holes on each toothed arc hole and the angle between adjacent tooth-shaped holes on adjacent toothed arc holes) is 30-60°.

[0026] Step 2: Side-blowing cooling, the wind speed of side-blowing cooling is 0.6-0.7 m / s and the temperature is 17-20°C.

[0027] Step 3: Apply oil at a rate of 0.75-0.85%.

[0028] Step 4: Winding, the winding speed is 4000-4500m / min.

[0029] Example 1 The preparation of 150D / 48f super imitation cotton polyester fiber includes the following steps: Step 1: melt-spinning the self-produced polyester melt with an intrinsic viscosity of 0.645 dl / g and a second esterification product of 470 mol / t (the number of moles of esterification product per ton in the second esterification reactor of polymerization is used for polymerization process control. The value will affect the intrinsic viscosity and thus the spinning effect) through spinneret hole I at a spinning box temperature of 285°C; specifically, Figure 1 As shown, the spinneret hole Ⅰ is composed of two toothed arc holes arranged at intervals, each toothed arc hole is composed of four tooth-shaped holes 1 evenly distributed on the periphery of the arc hole 2, the arc hole 2 is connected to the tooth-shaped hole 1 to form a toothed arc hole, the outer radius of the arc hole 2 is 0.4mm, the inner radius is 0.25mm, the narrow gap 3 between adjacent arc holes is 0.2mm wide, the tooth-shaped hole 1 is a long strip opening, the opening width of the tooth-shaped hole is 0.1mm, and the length is 0.6mm. The angle 4 between the center lines of adjacent tooth-shaped holes on each toothed arc hole is 45°, and the angle 4 between the center lines of adjacent tooth-shaped holes on adjacent toothed arc holes is also 45°.

[0030] Step 2: Side-blowing cooling, the wind speed of side-blowing cooling is 0.6m / s and the temperature is 19°C.

[0031] Step 3: Apply oil at a rate of 0.75%.

[0032] Step 4: Winding, the winding speed is 4500m / min.

[0033] Example 2 The difference from Example 1 is that the spinneret hole is composed of three toothed arc holes arranged at intervals.

[0034] The preparation of 75D / 48f super imitation cotton polyester fiber includes the following steps: Step 1: melt-spinning the self-produced polyester material with an intrinsic viscosity of 0.645 dl / g and a second ester of 470 mol / t through a spinneret II at a spinning box temperature of 285°C; specifically, Figure 2 As shown, spinneret II is composed of three toothed arc holes arranged at intervals, each toothed arc hole is composed of three tooth-shaped holes evenly distributed on the periphery of the arc hole, the arc holes are connected to the tooth-shaped holes, the outer radius of the arc hole is 0.4mm, the inner radius is 0.25mm, the narrow slit width between adjacent arc holes is 0.1mm, the tooth-shaped hole is a long strip opening, the opening width of the tooth-shaped hole is 0.1mm, and the length is 0.6mm. The angle between the center lines of adjacent tooth-shaped holes on each toothed arc hole is 40°, and the angle between the center lines of adjacent tooth-shaped holes on adjacent toothed arc holes is also 40°.

[0035] Step 2: Side-blowing cooling, the wind speed of side-blowing cooling is 0.6m / s and the temperature is 19°C.

[0036] Step 3: Apply oil at a rate of 0.75%.

[0037] Step 4: Winding, the winding speed is 4500m / min.

[0038] Example 3 The difference from Example 1 is that the spinneret hole is composed of 4 toothed arc holes arranged at intervals.

[0039] The preparation of 75D / 48f super imitation cotton polyester fiber includes the following steps: Step 1: melt-spinning the self-produced polyester material with an intrinsic viscosity of 0.645 dl / g and a second ester of 470 mol / t through a spinneret III at a spinning box temperature of 285° C.; specifically, Figure 3 As shown, spinneret hole III is composed of 4 toothed arc holes arranged at intervals, each toothed arc hole is composed of 2 tooth-shaped holes evenly distributed on the periphery of the arc hole, the arc holes are connected to the tooth-shaped holes, the outer radius of the arc hole is 0.4mm, the inner radius is 0.25mm, the narrow slit width between adjacent arc holes is 0.2mm, the tooth-shaped hole is a long strip opening, the opening width of the tooth-shaped hole is 0.1mm, and the length is 0.6mm. The angle between the center lines of adjacent tooth-shaped holes on each toothed arc hole is 45°, and the angle between the center lines of adjacent tooth-shaped holes on adjacent toothed arc holes is also 45°.

[0040] Step 2: Side-blowing cooling, the wind speed of side-blowing cooling is 0.6m / s and the temperature is 19°C.

[0041] Step 3: Apply oil at a rate of 0.75%.

[0042] Step 4: Winding, the winding speed is 4500m / min.

[0043] Example 4 The difference from Example 1 is that the parameter settings of the toothed circular arc hole are different.

[0044] The preparation of 150D / 48f super imitation cotton polyester fiber includes the following steps: Step 1: melt-spin the self-produced polyester material with a characteristic viscosity of 0.645 dl / g and a second ester of 470 mol / t through spinneret I at a spinning box temperature of 285°C; specifically, spinneret I is composed of two toothed arc holes arranged at intervals, each toothed arc hole is composed of 4 toothed holes evenly distributed on the periphery of the arc hole, the arc holes are connected to the toothed holes, the outer radius of the arc hole is 0.3 mm, the inner radius is 0.1 mm, the narrow slit width between adjacent arc holes is 0.1 mm, the toothed hole is a long strip opening, the opening width of the toothed hole is 0.08 mm, the length is 0.5 mm, the angle between the center lines of adjacent toothed holes on each toothed arc hole is 45°, and the angle between the center lines of adjacent toothed arc holes on adjacent toothed arc holes is also 45°.

[0045] Step 2: Side-blowing cooling, the wind speed of side-blowing cooling is 0.6m / s and the temperature is 19°C.

[0046] Step 3: Apply oil at a rate of 0.75%.

[0047] Step 4: Winding, the winding speed is 4500m / min.

[0048] Example 5 The difference from Example 1 is that the width of the narrow slits between adjacent arc holes and the opening width of the tooth-shaped holes are different.

[0049] The preparation of 150D / 48f super imitation cotton polyester fiber includes the following steps: Step 1: melt-spinning the self-produced polyester melt with a characteristic viscosity of 0.645 dl / g and a second ester of 470 mol / t through spinneret I at a spinning box temperature of 285°C; specifically, spinneret I is composed of two toothed arc holes arranged at intervals, each toothed arc hole is composed of 4 toothed holes evenly distributed on the periphery of the arc hole, the arc holes are connected to the toothed holes, the outer radius of the arc hole is 0.4 mm, the inner radius is 0.25 mm, the narrow slit width between adjacent arc holes is 0.15 mm, the toothed hole is a long strip opening, the opening width of the toothed hole is 0.12 mm, the length is 0.6 mm, the angle between the center lines of adjacent toothed holes on each toothed arc hole is 45°, and the angle between the center lines of adjacent toothed arc holes on adjacent toothed arc holes is also 45°.

[0050] Step 2: Side-blowing cooling, the wind speed of side-blowing cooling is 0.6m / s and the temperature is 19°C.

[0051] Step 3: Apply oil at a rate of 0.75%.

[0052] Step 4: Winding, the winding speed is 4500m / min.

[0053] Example 6 The difference from Example 1 is that the parameter settings of side blowing, oiling and winding are different.

[0054] The preparation of 150D / 48f super imitation cotton polyester fiber includes the following steps: Step 1: melt-spinning the self-produced polyester melt with a characteristic viscosity of 0.645 dl / g and a second ester of 470 mol / t, and spinning through spinneret I at a spinning box temperature of 285°C; specifically, spinneret I is composed of two toothed arc holes arranged at intervals, each toothed arc hole is composed of 4 toothed holes evenly distributed on the periphery of the arc hole, the arc holes are connected to the toothed holes, the outer radius of the arc hole is 0.4 mm, the inner radius is 0.25 mm, the narrow slit width between adjacent arc holes is 0.2 mm, the toothed hole is a long strip opening, the opening width of the toothed hole is 0.1 mm, and the length is 0.6 mm, the angle between the center lines of adjacent toothed holes on each toothed arc hole is 45°, and the angle between the center lines of adjacent toothed arc holes on adjacent toothed arc holes is also 45°.

[0055] Step 2: Side-blowing cooling, the wind speed of side-blowing cooling is 0.7m / s and the temperature is 20℃.

[0056] Step 3: Apply oil at a rate of 0.85%.

[0057] Step 4: Winding, the winding speed is 4000m / min.

[0058] Comparative Example 1 The difference from Example 1 is that the spinneret hole is a circular arc hole.

[0059] The preparation of 150D / 48f cotton-like polyester fiber includes the following steps: Step 1: melt-spin the self-produced polyester melt with a characteristic viscosity of 0.645 dl / g and a second ester of 470 mol / t through a spinneret at a spinning box temperature of 285°C; specifically, the spinneret is composed of two arc holes arranged at intervals, the outer radius of the arc hole is 0.4 mm, the inner radius is 0.25 mm, and the narrow slit width between adjacent arc holes is 0.2 mm.

[0060] Step 2: Side-blowing cooling, the wind speed of side-blowing cooling is 0.6m / s and the temperature is 19°C.

[0061] Step 3: Apply oil at a rate of 0.75%.

[0062] Step 4: Winding, the winding speed is 4500m / min.

[0063] Comparative Example 2 The difference from Example 1 is that the spinneret holes are tooth-shaped holes.

[0064] The preparation of 150D / 48f cotton-like polyester fiber includes the following steps: Step 1: melt-spinning the self-produced polyester melt with an intrinsic viscosity of 0.645 dl / g and a second ester of 470 mol / t through a spinneret at a spinning box temperature of 285°C; specifically, the spinneret is composed of 8 tooth-shaped holes arranged evenly at intervals and surrounded in a circle, the tooth-shaped hole is a long strip opening, the opening width of the tooth-shaped hole is 0.15 mm, the length is 0.6 mm, the extension lines of the central axis of each tooth-shaped hole intersect at one point, and the angle between any two adjacent tooth-shaped holes is the same as 45°, and the radius of the circle formed by connecting the innermost ends of each tooth-shaped hole is 0.25 mm.

[0065] Step 2: Side-blowing cooling, the wind speed of side-blowing cooling is 0.6m / s and the temperature is 19°C.

[0066] Step 3: Apply oil at a rate of 0.75%.

[0067] Step 4: Winding, the winding speed is 4500m / min.

[0068] Comparative Example 3 The difference from Example 1 is that the inner radius of the arc hole is too small, which is 0.06 mm.

[0069] The preparation of 150D / 48f cotton-like polyester fiber includes the following steps: Step 1: melt-spinning the self-produced polyester melt with a characteristic viscosity of 0.645 dl / g and a second ester of 470 mol / t through spinneret I at a spinning box temperature of 285°C; specifically, spinneret I is composed of two toothed arc holes arranged at intervals, each toothed arc hole is composed of 4 toothed holes evenly distributed on the periphery of the arc hole, the arc holes are connected to the toothed holes, the outer radius of the arc hole is 0.4 mm, the inner radius is 0.06 mm, the narrow slit width between adjacent arc holes is 0.2 mm, the toothed hole is a long strip opening, the opening width of the toothed hole is 0.1 mm, and the length is 0.6 mm. The angle between the center lines of adjacent toothed holes on each toothed arc hole is 45°, and the angle between the center lines of adjacent toothed arc holes on adjacent toothed arc holes is also 45°.

[0070] Step 2: Side-blowing cooling, the wind speed of side-blowing cooling is 0.6m / s and the temperature is 19°C.

[0071] Step 3: Apply oil at a rate of 0.75%.

[0072] Step 4: Winding, the winding speed is 4500m / min.

[0073] Comparative Example 4 The difference from Example 1 is that the width of the tooth-shaped hole is too narrow, with an opening width of 0.06 mm and a length of 0.5 mm.

[0074] The preparation of 50D / 48f super imitation cotton polyester fiber includes the following steps: Step 1: melt-spinning the self-produced polyester melt with a characteristic viscosity of 0.645 dl / g and a second ester of 470 mol / t through spinneret I at a spinning box temperature of 285°C; specifically, spinneret I is composed of two toothed arc holes arranged at intervals, each toothed arc hole is composed of 4 toothed holes evenly distributed on the periphery of the arc hole, the arc holes are connected to the toothed holes, the outer radius of the arc hole is 0.4 mm, the inner radius is 0.25 mm, the narrow slit width between adjacent arc holes is 0.2 mm, the toothed hole is a long strip opening, the opening width of the toothed hole is 0.06 mm, the length is 0.5 mm, the angle between the center lines of adjacent toothed holes on each toothed arc hole is 45°, and the angle between the center lines of adjacent toothed arc holes on adjacent toothed arc holes is also 45°.

[0075] Step 2: Side-blowing cooling, the wind speed of side-blowing cooling is 0.6m / s and the temperature is 19°C.

[0076] Step 3: Apply oil at a rate of 0.75%.

[0077] Step 4: Winding, the winding speed is 4500m / min.

[0078] Comparative Example 5 The difference from Example 1 is that there are too many tooth-shaped holes on a single arc hole.

[0079] The preparation of 50D / 48f super imitation cotton polyester fiber includes the following steps: Step 1: melt-spinning the self-produced polyester melt with a characteristic viscosity of 0.645 dl / g and a second ester of 470 mol / t through a spinneret at a spinning box temperature of 285°C; specifically, the spinneret is composed of two toothed arc holes arranged at intervals, each toothed arc hole is composed of 5 toothed holes evenly distributed on the periphery of the arc hole, the arc holes are connected to the toothed holes, the outer radius of the arc hole is 0.4 mm, the inner radius is 0.25 mm, the narrow slit width between adjacent arc holes is 0.2 mm, the toothed hole is a long strip opening, the opening width of the toothed hole is 0.08 mm, the length is 0.6 mm, the angle between the center lines of adjacent toothed holes on each toothed arc hole is 30°, and the angle between the center lines of adjacent toothed arc holes on adjacent toothed arc holes is 60°.

[0080] Step 2: Side-blowing cooling, the wind speed of side-blowing cooling is 0.6m / s and the temperature is 19°C.

[0081] Step 3: Apply oil at a rate of 0.75%.

[0082] Step 4: Winding, the winding speed is 4500m / min.

[0083] The performance test is as follows: Strength / elongation at break: GB / T 14344 Test method for tensile properties of chemical fiber filaments; Wicking height: GB / T 21655.1 Determination of wicking height for moisture absorption and quick-drying performance of textiles; Hollowness: FZ / T 50002 Test method for profile degree of chemical fibers.

[0084] Table 1 Strength (cN) Elongation at break (%) Wicking height (mm) Hollowness(%) Full roll rate (%) Example 1 3.85 49.3 95.1 4.5 95.3 Example 2 4.02 57.4 100.2 6.6 93.7 Example 3 3.95 51.2 110.0 8.6 91.3 Example 4 3.80 47.1 91.9 4.2 90.5 Example 5 3.91 48.7 93.0 5.9 93.8 Example 6 3.73 57.9 93.7 4.2 96.5 Comparative Example 1 3.76 48.3 40.5 4.6 98.2 Comparative Example 2 3.37 39.5 65.3 6.5 70.0 Comparative Example 3 3.94 51.4 92.8 3.7 89.4 Comparative Example 4 3.75 45.6 90.7 4.1 96.0 Comparative Example 5 3.82 48.7 89.2 4.2 81.7 As shown in Table 1, the present invention uses toothed arc holes as spinnerets to give the fiber sufficient mechanical strength and elasticity while maintaining sufficient fiber hollowness and surface groove structure, such as Figure 4 The figure shows the actual cross-sectional view of the fiber spun from the spinneret hole Ⅰ in the present invention. It can be clearly seen that the obtained fiber has a cotton-like cross-sectional view and a surface groove structure, indicating that the polyester fiber has a better cotton-like effect.

[0085] Comparative Example 1 uses a single arc hole as the spinneret, and the wick height and hollowness of the obtained fiber are significantly reduced, and the cotton-like effect is very poor. Comparative Example 2 uses a single tooth-shaped hole as the spinneret, and the obtained fiber has a certain hollowness, but the actual product wick height and defective rate are low, and the fiber mechanical properties are also greatly affected. Comparative Examples 3-5 are the parameters set for the toothed arc hole that exceed the specified range, and the hollowness, mechanical properties and full roll rate of the obtained fiber will be affected, indicating that the spinneret within the specified range of the present invention can give the fiber sufficient fiber hollowness and surface groove structure while ensuring good mechanical properties and low product defective rate, and the cotton-like effect and actual application effect are better.

[0086] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the specification of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A spinneret, characterized in that: The spinneret is provided with a plurality of spinneret holes; the spinneret holes are composed of 2 to 4 toothed arc holes arranged at intervals; the toothed arc holes are structures in which tooth-shaped holes are evenly distributed on the periphery of the arc holes, and the arc holes are connected to the tooth-shaped holes.

2. The spinneret according to claim 1, characterized in that: Each toothed arc hole is provided with no more than 4 tooth-shaped holes; the tooth-shaped holes are long strip openings; the opening width of the tooth-shaped holes is 0.08-0.15 mm, and the length is 0.3-0.6 mm.

3. The spinneret according to claim 1, characterized in that: The angle between the center lines of adjacent tooth-shaped holes is 30~60°.

4. The spinneret according to claim 1, characterized in that: The outer radius of the arc hole is 0.3-0.5 mm, and the inner radius is 0.1-0.25 mm.

5. The spinneret according to any one of claims 1 to 4, characterized in that: The width of the narrow gap between adjacent arc holes is 0.04~0.2mm.

6. A method for preparing super-cotton-like polyester fiber using a spinneret, characterized in that: The method comprises the following steps: spinning the polyester material by melt direct spinning or melt spinning through the spinneret as claimed in any one of claims 1 to 5, and then cooling by side blowing to obtain the super-cotton-like polyester fiber.

7. The method for preparing super-cotton-like polyester fiber using a spinneret according to claim 6, characterized in that: The box temperature of the spinning is 280-285°C; the wind speed of the side-blowing cooling is 0.6-0.7 m / s and the temperature is 19-22°C.

8. The method for preparing super-cotton-like polyester fiber using a spinneret according to claim 6 or 7, characterized in that: After side-blowing cooling, the tow is oiled and wound to produce super-cotton-like polyester fiber.

9. The method for preparing super-cotton-like polyester fiber using a spinneret according to claim 8, characterized in that: The oiling rate of the oiling is 0.75-0.85%.

10. The method for preparing super-cotton-like polyester fiber using a spinneret according to claim 8, characterized in that: The winding speed of the winding is 4000~4500m / min.

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