Orange segment-shaped fiber sea-island spinning assembly and spinning method

Abstract

The invention discloses an orange slice-shaped fiber sea-island type spinning assembly and a spinning method, belongs to the technical field of spinning equipment, and is characterized in that a boss of a distribution plate in the sea-island type spinning assembly is improved; the boss is in close contact with the upper surface of the spinneret plate, a plurality of discharging holes communicated with the second distribution holes are formed in the boss, a plurality of material passing grooves are formed in the circumferential direction of the boss, the discharging holes and the material passing grooves are arranged in a staggered and spaced mode, one end of the inner side of each material passing groove extends to the position above the corresponding spinneret hole, and the other end of the inner side of each material passing groove extends to the position above the corresponding spinneret hole. Sea component materials and island component materials are distributed into the spinneret orifices in a staggered mode through the discharging holes and the material passing grooves, then monofilaments with orange-segment-shaped sections are formed through the spinneret orifices, the island component materials are not completely wrapped by the sea component materials any more, in the follow-up island component material dissolving process, an alkaline aqueous solution can permeate into fibers from gaps between the monofilaments, and therefore the monofilaments are completely dissolved. And island component materials are fully dissolved to form fibers with cavities, so that the heat preservation performance and the moisture absorption and sweat releasing performance are improved.

Description

Technical Field

[0001] This invention relates to the field of textile equipment technology, specifically to an island-type spinneret assembly for orange-petal-shaped fibers and a spinning method. Background Technology

[0002] Spinnerets are commonly used products in the textile and chemical fiber industry. A spinneret consists of an inlet surface and an outlet surface. The inlet surface has inlet holes, and the outlet surface has outlet holes. The function of the spinneret is to transform viscous polymer melts or solutions into fine streams with specific cross-sectional shapes through micropores. These streams are then solidified by a solidification medium such as air or a solidification bath to form filaments, which enter through the inlet holes and exit through the outlet holes, forming fiber filaments.

[0003] To improve the warmth retention and moisture wicking properties of fibers, the commonly used method is to change the shape of the spinneret holes so that the monofilaments ejected from a single spinneret hole are hollow, or to make the cross-section of the monofilaments ejected from a single spinneret hole irregular, and to form a hollow structure after multiple monofilaments are bonded together.

[0004] For example, Chinese patent CN211999999U discloses a hollow gear-section fiber spinneret, including a spinneret body with several spinneret holes. Each spinneret hole includes an inlet, a feed channel, and an outlet, connected sequentially from top to bottom. The outlet hole includes multiple elongated through-holes, with the extensions of the central axes of each through-hole intersecting at a single point, and the included angle between any two adjacent elongated through-holes being the same. During the spinning process using this gear-section fiber spinneret, elongated fibers are ejected from the elongated through-holes of each spinneret. These fibers first bond together to form monofilaments with a gear-shaped cross-section, creating a hollow structure in the center. The resulting filaments are more fluffy, have a fuzzy feel, and a better hand feel. The presence of multiple hollow structures inside the filaments improves their heat retention and moisture absorption / wicking properties.

[0005] However, the polymer melt undergoes an expansion effect after being ejected from the spinneret. This means that as the melt is ejected, the compressed melt expands, filling the gaps between adjacent elongated through-holes. Consequently, the depressions around the monofilaments are not obvious, and the hollow structure formed by the bonded monofilaments is not clearly defined. Therefore, the high degree of hollowness in the fibers formed by the spinneret described above is only theoretically possible; in reality, the hollowness is not significant, and the heat insulation and moisture-wicking effects are greatly reduced.

[0006] Island-type composite fibers are produced by melting two polymers separately, dispersing the viscoelastic droplets of the island phase within a marine matrix. During spinning, the island phase undergoes high-ratio stretching and shear deformation, transforming into filaments. The resulting composite fibers, through appropriate stretching and heat treatment, can also become high-shrinkage fibers with excellent physical properties. Dissolving the marine phase in island-type fibers leaves a bundle of ultrafine fibers with a fineness of 0.01–0.2D. Removing the island phase yields hollow fibers, also known as lotus root-shaped fibers. However, when used to prepare hollow fibers, the island phase material is surrounded by the marine material, making removal difficult and incomplete, thus affecting the hollowness. Summary of the Invention

[0007] The purpose of this invention is to provide an island-type spinneret assembly and spinning method for orange-petal-shaped fibers, in order to solve the problems that spinnerets cannot guarantee hollowness, and that island phase materials are difficult to remove and are not completely removed when producing hollow fibers using island-type spinneret assemblies.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows:

[0009] This invention relates to an orange-petal-shaped fiber island-type spinneret assembly, which includes a distribution plate and a spinneret. The distribution plate is disposed above the spinneret, and the upper surface of the distribution plate is provided with a plurality of first annular material grooves and a plurality of second annular material grooves, which are arranged alternately at intervals.

[0010] The bottom surface of the distribution plate is provided with a bottom groove, and the distribution plate is provided with a first distribution hole and a second distribution hole; the feed end of the first distribution hole is connected to the first annular material trough, and the discharge end is connected to the bottom groove; the second distribution hole corresponds one-to-one with the spinneret hole of the spinneret, and the second distribution hole is located directly above the corresponding spinneret hole. The feed end of the second distribution hole is connected to the second annular material trough, and the discharge end is provided with a boss; the boss is in close contact with the upper surface of the spinneret, and the inside of the boss is provided with several discharge holes connected to the second distribution hole. The circumference of the boss is provided with several material passage grooves. The discharge holes and material passage grooves are arranged alternately, and one end of the inner side of the material passage groove extends to the top of the spinneret hole. The marine component material and the island component material are alternately distributed into the spinneret hole through the discharge hole and the material passage groove, and then a monofilament with an orange-petal-shaped cross section is formed through the spinneret hole.

[0011] Preferably, the discharge holes and the feed troughs are evenly spaced around the circumference.

[0012] The present invention also relates to a spinning method using the above-mentioned orange-petal-shaped fiber island-type spinneret, comprising the following steps:

[0013] S1. The marine component material and the island component material are alternately distributed into the spinneret orifice of the spinneret by the distribution plate, wherein the island component material is an alkali-soluble material and the marine component material is an alkali-insoluble material;

[0014] S2. Marine component material and island component material are ejected from the spinneret and cooled by air blowing to form orange-petal-shaped monofilament cross-section fibers with interlaced marine component material and island component material;

[0015] S3. The island component material is dissolved in an alkaline aqueous solution, leaving only the marine component material, to form a fiber with a cavity.

[0016] Preferably, in step S1, when the marine component material and the island component material are alternately distributed to the spinneret holes of the spinneret plate by the distribution plate, the island component material directly enters the corresponding spinneret hole through the second annular feed trough, the second distribution hole and the discharge hole, while the marine component material enters the spinneret hole circumferentially from the feed end of the corresponding spinneret hole after passing through the first annular feed trough, the first distribution hole, the bottom groove and the feed trough, and converges into one piece at the center of the spinneret hole due to the inward flow tendency of the marine component material.

[0017] Preferably, the mass ratio of alkali-soluble material to non-alkali-soluble material in S1 is 25:65 to 25:80.

[0018] Preferably, the air cooling in S2 adopts side blowing, with an air cooling temperature of 22-24℃ and a humidity of 75%-80%.

[0019] Preferably, the alkaline aqueous solution in S3 is a sodium hydroxide solution with a concentration of 5%.

[0020] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0021] The present invention relates to an orange-petal-shaped fiber island-type spinneret assembly, which improves upon the traditional island-type spinneret by modifying the boss. The boss is in close contact with the upper surface of the spinneret, and the inside of the boss is provided with several discharge holes communicating with the second distribution hole. The boss is provided with several material passage grooves around its circumference, and the discharge holes and material passage grooves are arranged alternately. One end of the material passage groove extends to the top of the spinneret hole. The sea component material and the island component material are alternately distributed into the spinneret hole through the discharge holes and material passage grooves, thereby forming monofilaments with an orange-petal-shaped cross section through the spinneret hole. This prevents the sea component material from completely covering the island component material, which facilitates the subsequent dissolution of the island component material. During this process, the alkaline aqueous solution can penetrate into the fiber from the gaps between the monofilaments and fully dissolve the island component material, forming fibers with cavities, thereby improving the heat insulation and moisture absorption and wicking properties. Attached Figure Description

[0022] Figure 1 This is a front view of the orange-petal-shaped fiber island-type spinneret assembly involved in the present invention;

[0023] Figure 2 This is a cross-sectional view of the orange-petal-shaped fiber island-type spinneret assembly involved in the present invention;

[0024] Figure 3 This is a top view of the distribution board;

[0025] Figure 4 This is a bottom view of the distribution board;

[0026] Figure 5 This is a magnified view of a portion of the boss;

[0027] Figure 6 This is a cross-sectional view of a fiber formed by the fusion of two materials within a spinneret orifice.

[0028] Reference numerals: 1-Distribution plate, 11-First annular trough, 12-Second annular trough, 13-First distribution hole, 14-Second distribution hole, 15-Bottom groove, 16-Boss, 17-Discharge hole, 18-Passage groove, 2-Spinneret, 21-Spinneret hole, 3-Non-alkali soluble material, 4-Alkali soluble material. Detailed Implementation

[0029] To further understand the content of this invention, the invention will be described in detail with reference to the embodiments. The following embodiments are used to illustrate the invention, but are not intended to limit the scope of the invention.

[0030] See attached document Figure 1 and attached Figure 2 As shown, the present invention relates to an orange-petal-shaped fiber island-type spinneret assembly, which includes a distribution plate 1 and a spinneret 2, wherein the distribution plate 1 is disposed above the spinneret 2.

[0031] See attached document Figure 3 As shown, the upper surface of the distribution plate 1 is provided with a plurality of first annular material grooves 11 and a plurality of second annular material grooves 12. Both the first annular material grooves 11 and the second annular material grooves 12 are annular structures and are arranged alternately at intervals. (Refer to attached figure) Figure 4 As shown, the bottom surface of the distribution plate 1 has a bottom groove 15. (Refer to the attached diagram.) Figure 2 As shown, the distribution plate 1 is provided with a first distribution hole 13 and a second distribution hole 14. The feed end of the first distribution hole 13 is connected to the first annular material trough 11, and the discharge end is connected to the bottom groove 15. The second distribution hole 14 corresponds one-to-one with the spinneret hole 21 of the spinneret plate 2, and the second distribution hole 14 is located directly above the corresponding spinneret hole 21. The feed end of the second distribution hole 14 is connected to the second annular material trough 12, and the discharge end is provided with a boss 16.

[0032] See attached document Figure 2 Appendix Figure 4 and attached Figure 5As shown, the boss 16 is in close contact with the upper surface of the spinneret 2. The inside of the boss 16 is provided with a plurality of discharge holes 17 that communicate with the second distribution hole 14. The boss 16 is provided with a plurality of material passage grooves 18 in the circumference. The discharge holes 17 and the material passage grooves 18 are arranged in a staggered manner in a circumferential manner, and one end of the inner side of the material passage groove 18 extends to the top of the spinneret 21. The marine component material and the island component material are staggeredly distributed into the spinneret through the discharge holes 17 and the material passage grooves 18, and then a monofilament with an orange-petal-shaped cross section is formed through the spinneret.

[0033] A spinning method using the above-mentioned orange-petal-shaped fiber island-type spinneret includes the following steps:

[0034] S1. Marine component material enters the first annular feed trough 11 of the distribution plate 1, and island component material enters the second annular feed trough 12. The distribution plate 1 alternately distributes the marine component material and island component material into the spinneret orifices of the spinneret. During this process, the island component material passes through the second annular feed trough 12, the second distribution hole 14, and the discharge hole 17 directly into the corresponding spinneret orifice 21. The marine component material passes through the first feed trough 11 and the first distribution hole 13 into the bottom groove 15, and then passes through the feed trough 18 to enter the spinneret orifice 21 circumferentially from the feed end of the corresponding spinneret orifice 21. Due to the inward flow tendency of the marine component material, it converges into a single unit at the center of the spinneret orifice. Figure 6 As shown. The island component material is an alkali-soluble material 4, such as COPET material, and the sea component material is an alkali-insoluble material 3, such as PET material. The mass ratio of the alkali-soluble material to the alkali-insoluble material is 25:65 to 25:80, preferably 25:75.

[0035] There are various ways in which marine component materials enter the first annular feed trough 11 and island component materials enter the second annular feed trough 12. These can be achieved by using a distribution plate in the prior art, which is not within the scope of protection of this patent, such as the Chinese invention patent application with publication number CN106757445A.

[0036] S2. Marine and island components are ejected from the spinneret and cooled by air blowing to form orange-petal-shaped monofilament fibers with interwoven marine and island components. The spinneret outlet can be a circular hole or any irregularly shaped hole. Side blowing is used for cooling, with a cooling temperature of 22-24℃ and a humidity of 75%-80%.

[0037] S3. The island component material is dissolved in an alkaline aqueous solution, retaining only the marine component material, to form a fiber with cavities; wherein, the alkaline aqueous solution is a sodium hydroxide solution with a concentration of 5%.

[0038] The present invention has been described in detail above with reference to the embodiments, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent protection scope of the present invention.

Claims

1. A sea-island type spinneret assembly for orange-petal-shaped fibers, comprising a distribution plate and a spinneret, wherein the distribution plate is disposed above the spinneret, characterized in that: The upper surface of the distribution plate is provided with a plurality of first annular material grooves and a plurality of second annular material grooves, which are arranged alternately at intervals; The bottom surface of the distribution plate is provided with a bottom groove, and the distribution plate is provided with a first distribution hole and a second distribution hole; the feed end of the first distribution hole is connected to the first annular material trough, and the discharge end is connected to the bottom groove; the second distribution hole corresponds one-to-one with the spinneret hole of the spinneret, and the second distribution hole is located directly above the corresponding spinneret hole. The feed end of the second distribution hole is connected to the second annular material trough, and the discharge end is provided with a boss; the boss is in close contact with the upper surface of the spinneret, and the inside of the boss is provided with several discharge holes connected to the second distribution hole. The circumference of the boss is provided with several material passage grooves. The discharge holes and material passage grooves are arranged alternately, and one end of the inner side of the material passage groove extends to the top of the spinneret hole. The marine component material and the island component material are alternately distributed into the spinneret hole through the discharge hole and the material passage groove, and then a monofilament with an orange-petal-shaped cross section is formed through the spinneret hole.

2. The orange-petal-shaped fiber island-type spinneret assembly according to claim 1, characterized in that: The discharge holes and feed troughs are evenly spaced around the circumference.

3. A spinning method using the orange-petal-shaped fiber island-type spinneret assembly as described in claim 1, characterized in that, Includes the following steps: S1. The marine component material and the island component material are alternately distributed into the spinneret orifice of the spinneret by the distribution plate, wherein the island component material is an alkali-soluble material and the marine component material is an alkali-insoluble material; S2. Marine component material and island component material are ejected from the spinneret and cooled by air blowing to form orange-petal-shaped monofilament cross-section fibers with interlaced marine component material and island component material; S3. The island component material is dissolved in an alkaline aqueous solution, leaving only the marine component material, to form a fiber with a cavity.

4. The spinning method using an island-type spinneret with orange-petal-shaped fibers according to claim 3, characterized in that: In step S1, when the marine component material and the island component material are alternately distributed to the spinneret holes of the spinneret plate by the distribution plate, the island component material directly enters the corresponding spinneret hole through the second annular feed trough, the second distribution hole and the discharge hole, while the marine component material enters the spinneret hole circumferentially from the feed end of the corresponding spinneret hole after passing through the first annular feed trough, the first distribution hole, the bottom groove and the feed trough, and converges into one piece at the center of the spinneret hole due to the inward flow trend of the marine component material.

5. The spinning method using an island-type spinneret with orange-petal-shaped fibers according to claim 3, characterized in that: The mass ratio of alkali-soluble material to non-alkali-soluble material in S1 is 25:65 to 25:

80.

6. The spinning method using an island-type spinneret with orange-petal-shaped fibers according to claim 3, characterized in that: The air cooling in S2 adopts side blowing, with a cooling temperature of 22-24℃ and a humidity of 75%-80%.

7. The spinning method of the orange-petal-shaped fiber island-type spinneret assembly according to claim 3, characterized in that: The alkaline aqueous solution in S3 is a sodium hydroxide solution with a concentration of 5%.

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