Non-woven fabric with longitudinal flow guide function and manufacturing method thereof

Abstract

The invention relates to a non-woven fabric with a longitudinal flow guide function and a manufacturing method thereof, the non-woven fabric comprises a first fiber net and a second fiber net, any one fiber net is provided with a plurality of longitudinal fiber bundles which are discretely distributed, the distribution density of the longitudinal fiber bundles is 1-50 bundles / cm < 2 >, the fibers of the longitudinal fiber bundles are the same as the fibers in the fiber net where the longitudinal fiber bundles are located, and the first fiber net and the second fiber net are arranged. By arranging a plurality of discretely distributed longitudinal fiber bundles in any one fiber net, when the fiber net is applied to surface layers or flow guide layers of personal care products and infant care products, liquid flows into the fiber net with the longitudinal fiber bundles, and the liquid flows into the surface layers or the flow guide layers of the personal care products and the infant care products; the liquid can rapidly permeate into the second fiber net along the longitudinal fiber bundles distributed in the liquid and even is guided into the absorption core body, rapid longitudinal flow guiding of the liquid is achieved, and the infiltration speed of the liquid is increased.

Description

Technical Field

[0001] The present invention relates to the field of non-woven fabrics, in particular to a non-woven fabric with a longitudinal flow-guiding function used for personal care and infant care, and a manufacturing method thereof. Background Art

[0002] Disposable sanitary products, such as diapers and sanitary napkins, must ensure rapid liquid penetration and prevent back-seepage to maintain a dry surface and enhance user comfort. Prior art nonwovens, the primary material for disposable sanitary products, suffer from slow liquid penetration and high back-seepage.

[0003] To address these issues, existing technologies combine fiber webs with different properties, leveraging the complementary properties of the fibers to achieve rapid liquid infiltration and inhibit back-infiltration. However, these technologies still have certain shortcomings, such as the limited fluid diversion effect of single-layer fiber webs and the inability of double-layer fiber webs to prevent thick liquids from seeping into the core layer. Consequently, these technologies cannot fully meet the needs of disposable sanitary products.

[0004] Therefore, it is necessary to develop a new type of non-woven fabric structure that can achieve longitudinal liquid diversion and inhibit liquid back-seepage while ensuring rapid liquid infiltration, thereby improving the comfort of disposable sanitary products. Summary of the Invention

[0005] The purpose of the present invention is to provide a non-woven fabric with fast infiltration, low back osmosis and longitudinal diversion function and its manufacturing method, so as to overcome the problems in the prior art of slow liquid infiltration, easy back osmosis of liquid and inability to achieve rapid longitudinal diversion of liquid in the non-woven fabric.

[0006] To achieve the above object, the solution of the present invention is: A nonwoven fabric with a longitudinal flow-guiding function, comprising a first fiber web and a second fiber web, wherein any one of the first fiber web and the second fiber web has a plurality of discretely distributed longitudinal fiber bundles, and the distribution density of the longitudinal fiber bundles is 1 to 50 bundles / cm 2 The fibers of the longitudinal fiber bundle are the same as the fibers of the fiber web layer.

[0007] The first fiber web is bicomponent fiber, low-melting point fiber and polyester fiber or a mixture thereof; the second fiber web is bicomponent fiber, low-melting point fiber and polyester fiber or a mixture thereof.

[0008] The first fiber web has a grammage of 10 to 50 gsm, and the second fiber web has a grammage of 10 to 50 gsm.

[0009] The first fiber web and the second fiber web both have a plurality of discretely distributed longitudinal fiber bundles.

[0010] The longitudinal fiber bundles penetrate the first fiber web and the second fiber web, and the fibers of the longitudinal fiber bundles are the same as the fibers in the second fiber web.

[0011] The longitudinal fiber bundles protrude from the upper surface of the first fiber web by 0 to 8 mm.

[0012] The hydrophilicity of the first fiber web is lower than that of the second fiber web.

[0013] The longitudinal fiber bundles include a first longitudinal fiber bundle and a second longitudinal fiber bundle both running through the first fiber web and the second fiber web, the fibers of the first longitudinal fiber bundle are the same as the fibers in the first fiber web, and the fibers of the second longitudinal fiber bundle are the same as the fibers in the second fiber web.

[0014] The longitudinal fiber bundles in the first fiber web and the longitudinal fiber bundles in the second fiber web are staggered and distributed in the fiber webs.

[0015] The number of longitudinal fiber bundles contained in the first fiber web is greater than the number of longitudinal fiber bundles contained in the second fiber web.

[0016] A method for manufacturing a non-woven fabric with a longitudinal flow-guiding function comprises stacking the first fiber web and the second fiber web to form a stacked fiber web, which is then needled by a needle-punching device. The needles in the needle-punching device penetrate the stacked fiber web and drive the fibers in the stacked fiber web to move longitudinally to form the longitudinal fiber bundles. The fibers are then shaped in a hot air oven to form the non-woven fabric with a longitudinal flow-guiding function.

[0017] The needles in the acupuncture device are distributed on a needle plate, and the needles move up and down along with the needle plate.

[0018] The needles in the acupuncture device are distributed on the needle roller, and the needles roll as the needle roller rotates.

[0019] The acupuncture device is only located on one side of the laminated fiber webs, and the needles only pierce the first fiber web or the second fiber web.

[0020] The acupuncture device is only located on one side of the laminated fiber web, and the acupuncture needles pierce the laminated fiber web.

[0021] The acupuncture devices are located on both sides of the stacked fiber webs, and the needles only pierce the corresponding first fiber web or second fiber web.

[0022] The number of longitudinal fiber bundles formed by the needles piercing the first fiber web is greater than the number of longitudinal fiber bundles formed by the needles piercing the second fiber web.

[0023] The acupuncture devices are located on both sides of the laminated fiber web, and the needles on both sides pierce the laminated fiber web respectively.

[0024] After adopting the above scheme, by setting a number of discretely distributed longitudinal fiber bundles in any fiber web, when used in the surface layer or diversion layer of personal care products or infant care products, when the liquid reaches the fiber web with longitudinal fiber bundles, the liquid will quickly penetrate into the second fiber web along the longitudinal fiber bundles distributed therein and even be diverted into the absorbent core, thereby realizing rapid longitudinal diversion of the liquid and increasing the liquid infiltration rate; at the same time, the diffusion area of the liquid in the first fiber web is reduced, which can reduce the liquid holding capacity and back seepage amount of the fiber web, and realize the longitudinal diffusion of the liquid in the first fiber web and the planar diffusion of the second fiber web or the absorbent core layer. After absorption, the liquid absorption traces are not obvious from the surface, that is, it has a "hidden blood" effect.

[0025] The production of longitudinal fiber bundles through a simple and easy-to-implement needle-punching process helps ensure the quality and performance stability of the nonwoven fabric. Furthermore, by adjusting the needling pattern and density, the distribution and number of longitudinal fiber bundles can be optimized, further enhancing the strength and flow conductivity of the nonwoven fabric. Furthermore, the presence of longitudinal fiber bundles provides the nonwoven with improved compression resistance, while hot air setting maximizes the fluffiness of the fiber web. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic cross-sectional view of the non-woven fabric in Example 1 of the present invention; Figure 2 Schematic diagram of the manufacturing process of the non-woven fabric in Example 1 of the present invention; Figure 3 Schematic cross-sectional view of the non-woven fabric in Example 2 of the present invention; Figure 4 Schematic diagram of the manufacturing process of the non-woven fabric in Example 2 of the present invention; Figure 5 Schematic cross-sectional view of the non-woven fabric in Example 3 of the present invention; Figure 6 Schematic diagram of the manufacturing process of the non-woven fabric in Example 3 of the present invention; Figure 7 Schematic cross-sectional view of the non-woven fabric in Example 4 of the present invention.

[0027] Description of labels: Example 1: nonwoven fabric 12, first fiber web 1, second fiber web 2, longitudinal fiber bundle 3, acupuncture device a, needle plate a1, needle a2; Example 2: nonwoven fabric 12, first fiber web 1, second fiber web 2, longitudinal fiber bundle 3, needling device a, needle roller a1, needle a2; Example 3: nonwoven fabric 12, first fiber web 1, second fiber web 2, first longitudinal fiber bundle 3, second longitudinal fiber bundle 3', first needling device a, first needle plate a1, first needle a2, second needling device a', second needle plate a1', second needle a2'; Example 4: nonwoven fabric 12, first fiber web 1, second fiber web 2, first longitudinal fiber bundles 3, second longitudinal fiber bundles 3'. DETAILED DESCRIPTION

[0028] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0029] Example 1 like Figure 1 As shown, the present invention discloses a nonwoven fabric 12 with a longitudinal flow guide function, comprising a first fiber web 1 and a second fiber web 2, wherein the first fiber web layer 1 has a plurality of discretely distributed longitudinal fiber bundles 3, and the distribution density of the longitudinal fiber bundles 3 is 1 to 50 bundles / cm 2 The fibers of the longitudinal fiber bundles 3 are the same as those in the first fiber web 1. The first fiber web 1 or the second fiber web 2 may be made of bicomponent fibers, low-melting point fibers and polyester fibers, or a blend thereof. The first fiber web 1 has a grammage of 10 to 50 gsm, and the second fiber web 2 has a grammage of 10 to 50 gsm.

[0030] In this embodiment, the distribution density of the longitudinal fiber bundles 3 is 10 bundles / cm 2 ; The first fiber web 1 is composed of 100% bicomponent fibers and has a gram weight of 20gsm. The second fiber web 2 is composed of 30% to 50% bicomponent fibers and 50% to 70% low-melting-point fibers and has a gram weight of 20gsm.

[0031] like Figure 2 As shown, the method for manufacturing a nonwoven fabric 12 with a longitudinal flow-guiding function of the present invention is as follows: the first fiber web 1 and the second fiber web 2 are stacked to form a laminated fiber web, which is then needled by a needle punching device a. In this embodiment 1, the needle punching device a is a needle board structure, and the needles a2 are obliquely distributed on the needle board a1 at a certain angle. The side walls of the needles a2 have barbs. During operation, the needles a2 in the needle punching device a move up and down with the needle board a1, piercing the laminated fiber web and driving the fibers in the laminated fiber web to move longitudinally to form the longitudinal fiber bundles 3. Since the needle punching device a is only located on one side of the laminated fiber web and the needles a2 only pierce the first fiber web 1, the longitudinal fiber bundles 3 formed are only located in the first fiber web 1. The laminated fiber web after needle punching is then shaped in a hot air oven to form the nonwoven fabric 12 with a longitudinal flow-guiding function.

[0032] When the non-woven fabric 12 with longitudinal diversion function is used as the surface layer of sanitary products, since the first fiber web 1 has longitudinal fiber bundles 3, while the second fiber web 2 does not have longitudinal fiber bundles 3, and the longitudinal fiber bundles 3 can be perpendicular to the fiber web plane or at a certain angle to the fiber web plane, when the liquid reaches the first fiber web 1, the liquid will quickly penetrate into the second fiber web 2 along the longitudinal fiber bundles 3 distributed therein and even be diverted into the absorption core, thereby realizing rapid longitudinal diversion of the liquid and increasing the liquid infiltration rate; at the same time, the diffusion area of the liquid in the first fiber web 1 is reduced, which can reduce the liquid holding capacity and back seepage amount of the fiber web, and realize the longitudinal diffusion of the liquid in the first fiber web 1 and the plane diffusion of the second fiber web 2 or the absorption core layer. After absorption, the liquid absorption traces are not obvious from the surface, that is, it has a "hidden blood" effect.

[0033] Example 2 like Figure 3 As shown, the present invention discloses a non-woven fabric 12 with a longitudinal flow-guiding function, comprising a first fiber web 1 and a second fiber web 2, wherein the first fiber web layer 1 has a plurality of discretely distributed longitudinal fiber bundles 3, and the longitudinal fiber bundles 3 penetrate the first fiber web and the second fiber web, and the fibers of the longitudinal fiber bundles 3 are the same as the fibers in the second fiber web 2.

[0034] In this embodiment, the distribution density of the longitudinal fiber bundles 3 is 15 bundles / cm 2 ; The longitudinal fiber bundle 3 can protrude from the upper surface of the first fiber web 1 by 0 to 8 mm, preferably 2 to 6 mm. The first fiber web 1 is composed of 100% 1.2dtex water-repellent bicomponent fibers with a gram weight of 15gsm. The second fiber web 2 is composed of 100% 2.0dtex hydrophilic bicomponent fibers with a gram weight of 20gsm.

[0035] like Figure 4As shown, the manufacturing method of the non-woven fabric 12 with longitudinal flow-guiding function of the present invention is as follows: a water-repellent first fiber web 1 and a hydrophilic second fiber web 2 are stacked to form a stacked fiber web, which is then needle-punched by a needle-punching device a. In this embodiment 1, the needle-punching device a is a needle roller structure, and the needles a2 are distributed on the needle roller a1. The side walls of the needles a2 have hooks. During operation, the needles a2 in the needle-punching device a rotate and roll with the needle roller a1, pierce the stacked fiber web, and drive the fibers in the stacked fiber web to move longitudinally to form the longitudinal fiber bundles 3. Since the needle-punching device a is located on one side of the second fiber web 2 in the stacked fiber web, and the needles a2 penetrate through the second fiber web 2 and the first fiber web 1, the formed longitudinal fiber bundles 3 are located in the second fiber web 2 and the first fiber web 1, and the fibers of the longitudinal fiber bundles are the same as the fibers in the second fiber web 2. The longitudinal fiber bundles 3 can protrude from the upper surface of the first fiber web 1 by 0 to 8 mm, preferably 2 to 6 mm. The laminated fiber web after the needle punching process is then shaped in a hot air oven to form the non-woven fabric 12 with the longitudinal flow guiding function.

[0036] When the non-woven fabric 12 with longitudinal diversion function is used as the surface layer of sanitary products, since the non-woven fabric 12 has longitudinal fiber bundles 3 running through the second fiber web 2 and the first fiber web 1, and the fibers of the longitudinal fiber bundles 3 are the same as those in the second fiber web 2, both are hydrophilic two-component fibers, and the first fiber web 1 is water-repellent two-component fibers, when the liquid contacts the first fiber web 1, the liquid can only be diverted to the second fiber web 2 and the absorption core through the longitudinal fiber bundles 3 protruding 0 to 8 mm from the upper surface of the first fiber web 1. During this absorption process, by arranging discretely distributed longitudinal fiber bundles 3 in the non-woven fabric, rapid longitudinal diversion of the liquid is achieved, and the liquid infiltration speed is increased; and the longitudinal fiber bundles 3 run through the first fiber web 1 and the second fiber web 2, which is conducive to the infiltration of thick liquid into the core layer, thereby improving the absorption performance; and the difference in hydrophilicity between the first fiber web 1 and the second fiber web 2 can also effectively inhibit liquid backseepage, thereby improving the comfort of use. At the same time, the longitudinal fiber bundles 3 are prepared by a needle punching process, which is simple and easy to implement, and is conducive to ensuring the molding quality and performance stability of the non-woven fabric; the distribution and quantity of the longitudinal fiber bundles 3 can also be optimized by adjusting the needle punching method and needle punching density of the needle punching device, thereby further improving the strength and flow conductivity of the non-woven fabric.

[0037] Example 3 like Figure 5As shown, the present invention discloses a non-woven fabric 12 with a longitudinal flow-guiding function, comprising a first fiber web 1 and a second fiber web 2. The non-woven fabric 12 with a longitudinal flow-guiding function has a plurality of discretely distributed first longitudinal fiber bundles 3 and second longitudinal fiber bundles 3', wherein the first longitudinal fiber bundles 3 and the second longitudinal fiber bundles 3' both run through the first fiber web 1 and the second fiber web 2, the fibers of the first longitudinal fiber bundles 3 are the same as the fibers in the first fiber web 1, and the fibers of the second longitudinal fiber bundles 3' are the same as the fibers in the second fiber web 2.

[0038] In this embodiment, the first longitudinal fiber bundles 3 and the second longitudinal fiber bundles 3' are staggered and distributed at a density of 20 bundles / cm 2 ; The second longitudinal fiber bundle 3' can protrude from the upper surface of the first fiber web 1 by 0 to 8 mm, preferably 2 to 6 mm, and the first longitudinal fiber bundle 3 can protrude from the lower surface of the second fiber web 2 by 0 to 8 mm, preferably 2 to 6 mm; the first fiber web 1 is composed of 100% 1.2dtex weakly hydrophilic bicomponent fibers with a gram weight of 20gsm, and the second fiber web 2 is composed of 80% 6.0dtex hydrophilic bicomponent fibers and 20% low-melting point polyester fibers coPET with a gram weight of 10gsm.

[0039] like Figure 6 As shown, the manufacturing method of the non-woven fabric 12 with longitudinal flow guide function of the present invention is as follows: the first fiber web 1 and the second fiber web 2 are stacked to form a stacked fiber web, and a needle punching device consisting of a first needle punching device a and a second needle punching device a' is used for a needle punching treatment. In this embodiment 1, the first needle punching device a located on one side of the second fiber web 2 is a needle plate structure, the first needles a2 are vertically distributed on the first needle plate a1, and the side walls of the first needles a2 have barbs. The second needle punching device a' located on one side of the first fiber web 1 is also a needle plate structure, the second needles a2' are vertically distributed on the second needle plate a1', and the side walls of the second needles a2' are provided with hooks. The needles a2 and a2' in the first and second needling devices a' move up and down with the first and second needle plates a1' during operation, piercing the laminated fiber web and driving the fibers in the laminated fiber web to move longitudinally to form the first and second longitudinal fiber bundles 3 and 3'. The formed first and second longitudinal fiber bundles 3 and 3' both penetrate the first and second fiber webs 1 and 2, wherein the fibers of the first longitudinal fiber bundle 3 are the same as those in the first fiber web 1, and the fibers of the second longitudinal fiber bundle 3' are the same as those in the second fiber web 2. The laminated fiber webs after the needling treatment are then shaped in a hot air oven to form the non-woven fabric 12 with longitudinal flow-guiding function.

[0040] The nonwoven fabric with longitudinal flow-guiding function formed after adopting this technical solution can combine the advantages and disadvantages of the first fiber web 1 and the second fiber web 2 in penetration and back-seepage through the first longitudinal fiber bundle 3 and the second longitudinal fiber bundle 3' distributed in the fiber web, and make the best use of the strengths and weaknesses of the nonwoven fabric to give full play to the best penetration performance of the nonwoven fabric. In this embodiment, the first fiber web 1 is composed of weakly hydrophilic fibers, and the penetration speed is slow but the anti-back-seepage effect is good. The second longitudinal fiber bundle 3' that runs through it, because its fibers are the same as those in the second fiber web 2, are all hydrophilic fibers, it can effectively improve the penetration speed. Similarly, the first longitudinal fiber bundle 3 that runs through it can also improve the anti-back-seepage effect in the second fiber web 2. At the same time, the presence of the first longitudinal fiber bundle 3 and the second longitudinal fiber bundle 3' can also provide the nonwoven fabric with better compression resistance, and the use of hot air shaping maintains the fluffiness of the fiber web to the greatest extent.

[0041] Example 4 like Figure 7 As shown, the present invention discloses a non-woven fabric 12 with a longitudinal flow-guiding function, comprising a first fiber web 1 and a second fiber web 2, wherein the first fiber web layer 1 has a plurality of discretely distributed first longitudinal fiber bundles 3, and the fibers of the first longitudinal fiber bundles 3 are the same as the fibers in the first fiber web 1, and the second fiber web 2 has a plurality of discretely distributed second longitudinal fiber bundles 3', and the fibers of the second longitudinal fiber bundles 3' are the same as the fibers in the second fiber web 2. In this embodiment, the distribution density of the first longitudinal fiber bundles 3 is 30 bundles / cm 2 , and the distribution density of the second longitudinal fiber bundle 3' is 10 bundles / cm 2 The distribution density of the first longitudinal fiber bundle 3 and the second longitudinal fiber bundle 3' can be the same or different; the first longitudinal fiber bundle 3 in the first fiber web 1 and the second longitudinal fiber bundle 3' in the second fiber web 2 can also be staggered.

[0042] The first longitudinal fiber bundle 3 and the second longitudinal fiber bundle 3' can protrude from the surface of the fiber web by 0 to 8 mm, preferably 2 to 6 mm; the first fiber web 1 is composed of 100% 1.2dtex weakly hydrophilic bicomponent fiber with a gram weight of 15gsm, and the second fiber web 2 is composed of 60% 3.0dtex hydrophilic polyester fiber PET and 40% low-melting point polyester fiber coPET with a gram weight of 10gsm.

[0043] The method for manufacturing a nonwoven fabric 12 having a longitudinal flow-guiding function according to the present invention is the same as that of Example 3, except that during the needling process, the movement distance of the needles in the needling device is controlled so that the formed first longitudinal fiber bundles 3 are present only in the first fiber web 1, and the second longitudinal fiber bundles 3' are present only in the second fiber web 2. By adjusting the distribution and number of needles, the distribution of the first longitudinal fiber bundles 3 and the second longitudinal fiber bundles 3' can be adjusted to meet the requirements of nonwoven fabrics for different applications.

[0044] After adopting the above scheme, the nonwoven fabric 12 with longitudinal diversion function in this embodiment contains a first longitudinal fiber bundle 3 in the first fiber web 1, and a second longitudinal fiber bundle 3' in the second fiber web 2, and the number of fiber bundles of the first longitudinal fiber bundle 3 is greater than the number of fiber bundles of the second longitudinal fiber bundle 3'. The first fiber web 1 has a large number of first longitudinal fiber bundles 3, which can quickly divert liquid along the first longitudinal fiber bundle 3 to the second fiber web 2, accelerating liquid penetration and absorption; while the second fiber web 2 has a small number of second longitudinal fiber bundles 3', which can not only accelerate the longitudinal diversion of liquid to the absorbent core, but also avoid the second longitudinal fiber bundle 3' being too numerous and causing the liquid to seep back along the second longitudinal fiber bundle 3'. The first longitudinal fiber bundle 3 and the second longitudinal fiber bundle 3' do not penetrate the nonwoven fabric 12. Therefore, even if the absorbed liquid seeps back along the second longitudinal fiber bundle 3', it only seeps back into the second fiber web 2, preventing the liquid from directly seeping back to the surface layer of the nonwoven fabric 12 along the first longitudinal fiber bundle 3 and the second longitudinal fiber bundle 3' that penetrate the nonwoven fabric 12, thereby improving the dryness of the nonwoven fabric 12.

Claims

1. A nonwoven fabric with longitudinal flow-guiding function, characterized in that: The nonwoven fabric comprises a first fiber web and a second fiber web, wherein any one of the first fiber web and the second fiber web has a plurality of discretely distributed longitudinal fiber bundles, and the distribution density of the longitudinal fiber bundles is 1 to 50 bundles / cm 2 , the fibers of the longitudinal fiber bundle are the same as the fibers in the fiber web.

2. The nonwoven fabric with longitudinal flow-guiding function according to claim 1, wherein: The first fiber web is bicomponent fiber, low-melting point fiber and polyester fiber or a mixture thereof; the second fiber web is bicomponent fiber, low-melting point fiber and polyester fiber or a mixture thereof.

3. The nonwoven fabric with longitudinal flow-guiding function according to claim 1, wherein: The first fiber web has a grammage of 10 to 50 gsm, and the second fiber web has a grammage of 10 to 50 gsm.

4. The nonwoven fabric with longitudinal flow-guiding function according to claim 1, wherein: The first fiber web and the second fiber layer both have a plurality of discretely distributed longitudinal fiber bundles.

5. The nonwoven fabric with longitudinal flow-guiding function according to claim 4, characterized in that: The longitudinal fiber bundles penetrate the first fiber web and the second fiber web, and the fibers of the longitudinal fiber bundles are the same as the fibers in the second fiber web.

6. The nonwoven fabric with longitudinal flow-guiding function according to claim 5, characterized in that: The longitudinal fiber bundles protrude from the upper surface of the first fiber web by 0 to 8 mm.

7. The nonwoven fabric with longitudinal flow-guiding function according to claim 5, wherein: The hydrophilicity of the first fiber web is lower than that of the second fiber web.

8. The nonwoven fabric with longitudinal flow-guiding function according to claim 4, wherein: The longitudinal fiber bundles include a first longitudinal fiber bundle and a second longitudinal fiber bundle both running through the first fiber web and the second fiber web, the fibers of the first longitudinal fiber bundle are the same as the fibers in the first fiber web, and the fibers of the second longitudinal fiber bundle are the same as the fibers in the second fiber web.

9. The nonwoven fabric with longitudinal flow-guiding function according to claim 4, wherein: The longitudinal fiber bundles in the first fiber web and the longitudinal fiber bundles in the second fiber web are staggered and distributed in the fiber webs.

10. The nonwoven fabric with longitudinal flow-guiding function according to claim 9, characterized in that: The number of longitudinal fiber bundles contained in the first fiber web layer is greater than the number of longitudinal fiber bundles contained in the second fiber web layer.

11. A method for manufacturing the nonwoven fabric with longitudinal flow guiding function according to any one of claims 1 to 10, characterized in that: The first fiber web and the second fiber web are stacked to form a stacked fiber web, which is then needled by a needle punching device. The needles in the needle punching device penetrate into the stacked fiber web and drive the fibers in the stacked fiber web to move longitudinally to form the longitudinal fiber bundles. The stacked fiber web is then shaped in a hot air oven to form the non-woven fabric with longitudinal flow-guiding function.

12. The method for manufacturing a nonwoven fabric with longitudinal flow guiding function according to claim 11, wherein: The needles in the acupuncture device are distributed on a needle plate, and the needles move up and down along with the needle plate.

13. The method for manufacturing a nonwoven fabric with longitudinal flow guiding function according to claim 11, wherein: The needles in the acupuncture device are distributed on the needle roller, and the needles roll as the needle roller rotates.

14. The method for manufacturing a nonwoven fabric with longitudinal flow guiding function according to claim 11, wherein: The acupuncture device is only located on one side of the laminated fiber webs, and the needles only pierce the first fiber web or the second fiber web.

15. The method for manufacturing a nonwoven fabric with longitudinal flow guiding function according to claim 11, wherein: The acupuncture device is only located on one side of the laminated fiber web, and the acupuncture needles pierce the laminated fiber web.

16. The method for manufacturing a nonwoven fabric with longitudinal flow guiding function according to claim 11, wherein: The acupuncture devices are located on both sides of the stacked fiber webs, and the needles only pierce the corresponding first fiber web or second fiber web.

17. The method for manufacturing a nonwoven fabric with longitudinal flow guiding function according to claim 16, wherein: The number of longitudinal fiber bundles formed by the needles piercing the first fiber web is greater than the number of longitudinal fiber bundles formed by the needles piercing the second fiber web.

18. The method for manufacturing a nonwoven fabric with longitudinal flow guiding function according to claim 11, wherein: The acupuncture devices are located on both sides of the laminated fiber web, and the needles on both sides pierce the laminated fiber web respectively.

Images