Nonwoven fabric with longitudinal flow guiding function

Abstract

A nonwoven fabric with longitudinal fluid conducting function, the nonwoven fabric comprises a first fiber web and a second fiber web, and each fiber web has a plurality of discrete longitudinal fiber bundles, 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 web, by arranging a plurality of discrete longitudinal fiber bundles in each fiber web, when the liquid reaches the fiber web with longitudinal fiber bundles, the liquid will quickly penetrate to the second fiber web along the longitudinal fiber bundles distributed therein or even be conducted to the absorbent core, realizing the rapid longitudinal fluid conducting of the liquid and improving the liquid infiltration speed.

Description

Technical Field

[0001] This utility model relates to the field of nonwoven fabrics, and in particular to a nonwoven fabric with longitudinal flow guiding function for use in personal care and infant care. Background Technology

[0002] Disposable hygiene products such as diapers and sanitary napkins need to meet two conditions for use: rapid liquid absorption and inhibition of backflow to keep the surface dry and improve user comfort. In existing technologies, non-woven fabrics, as the main material for disposable hygiene products, suffer from slow liquid absorption and a tendency for backflow.

[0003] To address these issues, existing technologies combine fiber webs with different properties, utilizing the complementary effects of fiber properties to achieve rapid liquid penetration and inhibit liquid backflow. However, these technologies still have certain shortcomings, such as the limited flow-guiding effect of single-layer fiber webs and the inability of double-layer fiber webs to allow viscous liquids to penetrate to the core layer, thus failing to fully meet the usage requirements of disposable hygiene products.

[0004] Therefore, it is necessary to develop a new type of nonwoven fabric structure that can ensure rapid liquid infiltration while achieving longitudinal liquid flow and inhibiting liquid backflow, thereby improving the comfort of disposable hygiene products. Utility Model Content

[0005] The purpose of this invention is to provide a nonwoven fabric with rapid infiltration and low backflow, which has a longitudinal flow guiding function, overcoming the problems of slow liquid infiltration speed, easy liquid backflow, and inability to achieve rapid longitudinal flow guiding of liquid in the existing technology.

[0006] To achieve the above objectives, the solution of this utility model is:

[0007] A nonwoven fabric with longitudinal flow guiding function, comprising a first fiber web and a second fiber web, wherein either the first fiber web or the second fiber web has a plurality of discretely distributed longitudinal fiber bundles, the distribution density of the longitudinal fiber bundles being 1 to 50 bundles / cm. 2 The fibers of the longitudinal fiber bundle are the same as the fibers of the fiber web layer in which it is located.

[0008] The first fiber web is a bicomponent fiber, a low-melting-point fiber, or a polyester fiber; the second fiber web is a bicomponent fiber, a low-melting-point fiber, or a polyester fiber.

[0009] The basis weight of the first fiber web is 10-50 gsm, and the basis weight of the second fiber web is 10-50 gsm.

[0010] Both the first and second fiber webs have several discretely distributed longitudinal fiber bundles.

[0011] The longitudinal fiber bundle passes through the first fiber web and the second fiber web, and the fibers of the longitudinal fiber bundle are the same as the fibers in the second fiber web.

[0012] The longitudinal fiber bundles protrude 0-8 mm from the upper surface of the first fiber web.

[0013] The first fiber web has lower hydrophilicity than the second fiber web.

[0014] The longitudinal fiber bundle includes a first longitudinal fiber bundle and a second longitudinal fiber bundle that both penetrate 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.

[0015] The longitudinal fiber bundles in the first fiber web and the longitudinal fiber bundles in the second fiber web are interspersed in the respective fiber webs.

[0016] The number of longitudinal fiber bundles in the first fiber web is greater than the number of longitudinal fiber bundles in the second fiber web.

[0017] By adopting the above scheme, by setting several discretely distributed longitudinal fiber bundles in any fiber network, when applied to the surface layer or guide layer of personal care products or infant care products, when liquid reaches the fiber network with longitudinal fiber bundles, the liquid will quickly penetrate into the second fiber network or even be guided into the absorbent core along the longitudinal fiber bundles distributed therein, realizing rapid longitudinal guidance of the liquid and improving the liquid infiltration speed; at the same time, the diffusion area of ​​the liquid in the first fiber network is reduced, which can reduce the liquid holding capacity and backflow of the fiber network, realizing longitudinal diffusion of the liquid in the first fiber network and planar diffusion in the second fiber network or absorbent core layer. After absorption, the liquid absorption traces are not obvious from the surface, that is, it has a "hidden blood" effect. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of the nonwoven fabric in Embodiment 1 of this utility model;

[0019] Figure 2 This is a schematic diagram illustrating the manufacturing process of the nonwoven fabric in Embodiment 1 of this utility model;

[0020] Figure 3 This is a cross-sectional schematic diagram of the nonwoven fabric in Embodiment 2 of this utility model;

[0021] Figure 4 This is a schematic diagram illustrating the manufacturing process of the nonwoven fabric in Embodiment 2 of this utility model;

[0022] Figure 5 This is a cross-sectional schematic diagram of the nonwoven fabric in Embodiment 3 of this utility model;

[0023] Figure 6 This is a schematic diagram illustrating the manufacturing process of the nonwoven fabric in Embodiment 3 of this utility model;

[0024] Figure 7 This is a cross-sectional schematic diagram of the nonwoven fabric in Embodiment 4 of this utility model.

[0025] Label Explanation:

[0026] Example 1: Nonwoven fabric 12, first fiber web 1, second fiber web 2, longitudinal fiber bundle 3, needle punching device a, needle plate a1, needle a2;

[0027] Example 2: Nonwoven fabric 12, first fiber web 1, second fiber web 2, longitudinal fiber bundle 3, needle punching device a, needle roller a1, needle a2;

[0028] Example 3: Nonwoven fabric 12, first fiber web 1, second fiber web 2, first longitudinal fiber bundle 3, second longitudinal fiber bundle 3', first needle punching device a, first needle plate a1, first needle a2, second needle punching device a', second needle plate a1', second needle a2';

[0029] Example 4: Nonwoven fabric 12, first fiber web 1, second fiber web 2, first longitudinal fiber bundle 3, second longitudinal fiber bundle 3'. Detailed Implementation

[0030] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0031] Example 1

[0032] like Figure 1 As shown, this utility model discloses a nonwoven fabric 12 with longitudinal flow guiding function, comprising a first fiber web 1 and a second fiber web 2. The first fiber web layer 1 has a plurality of discretely distributed longitudinal fiber bundles 3, the distribution density of the longitudinal fiber bundles 3 being 1 to 50 bundles / cm. 2 The fibers of the longitudinal fiber bundle 3 are the same as those in the first fiber web 1. The first fiber web 1 or the second fiber web 2 can be bicomponent fibers, low-melting-point fibers and polyester fibers, or a mixture thereof. The basis weight of the first fiber web 1 is 10-50 gsm, and the basis weight of the second fiber web 2 is 10-50 gsm.

[0033] In this embodiment: the distribution density of the longitudinal fiber bundle 3 is 10 bundles / cm. 2 The first fiber web 1 is composed of 100% bicomponent fibers with a basis weight of 20 gsm, and the second fiber web 2 is composed of 30% to 50% bicomponent fibers and 50% to 70% low melting point fibers with a basis weight of 20 gsm.

[0034] like Figure 2 As shown, the manufacturing method of the nonwoven fabric 12 with longitudinal flow guiding function of this utility model is as follows: The first fiber web 1 and the 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 plate structure, and the needles a2 are obliquely distributed at a certain angle on the needle plate a1. The sidewalls of the needles a2 have hooks. During operation, the needles a2 in the needle-punching device a move up and down with the needle plate a1, piercing the stacked fiber web and driving the fibers in the stacked fiber web to move longitudinally to form the longitudinal fiber bundle 3. Since the needle-punching device a is only located on one side of the stacked fiber web, and the needles a2 only pierce the first fiber web 1, the formed longitudinal fiber bundle 3 is only located in the first fiber web 1. Then, the needle-punched stacked fiber web is shaped in a hot air oven to form the nonwoven fabric 12 with longitudinal flow guiding function.

[0035] When the nonwoven fabric 12 with longitudinal flow guiding 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, 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 liquid reaches the first fiber web 1, the liquid will quickly penetrate into the second fiber web 2 or even be guided into the absorbent core along the longitudinal fiber bundles 3 distributed therein, thereby realizing the rapid longitudinal flow of liquid and improving the liquid infiltration speed; at the same time, the diffusion area of ​​liquid in the first fiber web 1 is reduced, which can reduce the liquid holding capacity and backflow of the fiber web, realizing the longitudinal diffusion of liquid in the first fiber web 1 and the planar diffusion of liquid in the second fiber web 2 or absorbent core layer. After absorption, the liquid absorption traces are not obvious from the surface, that is, it has a "hidden blood" effect.

[0036] Example 2

[0037] like Figure 3 As shown, this utility model discloses a nonwoven fabric 12 with longitudinal flow guiding function, comprising a first fiber web 1 and a second fiber web 2. The first fiber web layer 1 has a plurality of discretely distributed longitudinal fiber bundles 3, which penetrate the first fiber web and the second fiber web. The fibers of the longitudinal fiber bundles 3 are the same as the fibers in the second fiber web 2.

[0038] In this embodiment: the distribution density of the longitudinal fiber bundle 3 is 15 bundles / cm. 2 The longitudinal fiber bundle 3 can protrude 0-8 mm, preferably 2-6 mm, from the upper surface of the first fiber web 1. The first fiber web 1 is composed of 100% 1.2 dtex hydrophobic bicomponent fibers with a basis weight of 15 gsm, and the second fiber web 2 is composed of 100% 2.0 dtex hydrophilic bicomponent fibers with a basis weight of 20 gsm.

[0039] like Figure 4As shown, the manufacturing method of the nonwoven fabric 12 with longitudinal flow guiding function of this utility model 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 wall of the needles a2 has hooks. During operation, the needles a2 in the needle-punching device a rotate and roll with the needle roller a1, piercing the stacked fiber web and driving the fibers in the stacked fiber web to move longitudinally to form the longitudinal fiber bundle 3. Since the needle-punching device a is located on the 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 bundle 3 is located in the second fiber web 2 and the first fiber web 1, and the fibers of the longitudinal fiber bundle are the same as the fibers in the second fiber web 2. The longitudinal fiber bundle 3 can protrude 0-8mm from the upper surface of the first fiber web 1, preferably 2-6mm. Then, the needle-punched laminated fiber web is shaped in a hot air oven to form the nonwoven fabric 12 with longitudinal flow guiding function.

[0040] When the nonwoven fabric 12 with longitudinal flow guiding function is used as the surface layer of sanitary products, since the nonwoven fabric 12 has longitudinal fiber bundles 3 that run 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 being hydrophilic bicomponent fibers, while the first fiber web 1 is a hydrophobic bicomponent fiber, when liquid comes into contact with the first fiber web 1, the liquid can only be guided to the second fiber web 2 and the absorbent core through the longitudinal fiber bundles 3 that protrude 0-8mm from the upper surface of the first fiber web 1. In this absorption process, by setting the discretely distributed longitudinal fiber bundles 3 in the nonwoven fabric, the rapid longitudinal flow of liquid is achieved, which improves the liquid penetration speed; and the longitudinal fiber bundles 3 run through the first fiber web 1 and the second fiber web 2, which is conducive to the penetration of viscous liquid into the core layer, 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 backflow, improving the comfort of use. Meanwhile, the longitudinal fiber bundles 3 are prepared by needle punching, which is a simple and easy process to implement, and is conducive to ensuring the forming quality and performance stability of nonwoven fabrics. Furthermore, by adjusting the needle punching method and needle punching density of the needle punching device, the distribution and number of longitudinal fiber bundles 3 can be optimized, thereby further improving the strength and flow conductivity of nonwoven fabrics.

[0041] Example 3

[0042] like Figure 5As shown, this utility model discloses a nonwoven fabric 12 with longitudinal flow guiding function, comprising a first fiber web 1 and a second fiber web 2. The nonwoven fabric 12 with longitudinal flow guiding function has a plurality of discretely distributed first longitudinal fiber bundles 3 and second longitudinal fiber bundles 3'. The first longitudinal fiber bundles 3 and the second longitudinal fiber bundles 3' both penetrate 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, while the fibers of the second longitudinal fiber bundles 3' are the same as the fibers in the second fiber web 2.

[0043] In this embodiment: the first longitudinal fiber bundle 3 and the second longitudinal fiber bundle 3' are staggered, with a distribution density of 20 bundles / cm² for each. 2 The second longitudinal fiber bundle 3' can protrude 0-8 mm, preferably 2-6 mm, from the upper surface of the first fiber web 1, while the first longitudinal fiber bundle 3 can protrude 0-8 mm, preferably 2-6 mm, from the lower surface of the second fiber web 2; the first fiber web 1 is composed of 100% 1.2 dtex weakly hydrophilic bicomponent fibers with a basis weight of 20 gsm, and the second fiber web 2 is composed of 80% 6.0 dtex hydrophilic bicomponent fibers and 20% low-melting-point polyester fiber coPET with a basis weight of 10 gsm.

[0044] like Figure 6 As shown, the manufacturing method of the nonwoven fabric 12 with longitudinal flow guiding function of this utility model is as follows: the first fiber web 1 and the second fiber web 2 are stacked to form a stacked fiber web, which is then needled by a needle-punching device composed of a first needle-punching device a and a'. 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, and the first needles a2 are vertically distributed on the first needle plate a1. The sidewall of the first needles a2 has hooks. The second needle-punching device a' located on one side of the first fiber web 1 is also a needle plate structure, and the second needles a2' are vertically distributed on the second needle plate a1'. The sidewall of the second needles a2' has hooks. The wall has barbs. During operation, the first needle a2 and the second needle a2' in the first needle-punching device a and the second needle-punching device a' move up and down with the first needle plate a1 and the second needle plate a1', piercing into the stacked fiber web and driving the fibers in the stacked fiber web to move longitudinally to form the first longitudinal fiber bundle 3 and the second longitudinal fiber bundle 3'. The first longitudinal fiber bundle 3 and the second longitudinal fiber bundle 3' both penetrate the first fiber web 1 and the second fiber web 2, wherein: the fibers of the first longitudinal fiber bundle 3 are the same as the fibers in the first fiber web 1, and the fibers of the second longitudinal fiber bundle 3' are the same as the fibers in the second fiber web 2. Then, the stacked fiber web after needle-punching is shaped in a hot air oven to form the nonwoven fabric 12 with longitudinal flow guiding function.

[0045] The nonwoven fabric with longitudinal flow guiding function formed by adopting this technical solution can combine the advantages and disadvantages of the first fiber web 1 and the second fiber web 2 in terms of permeation and backflow through the first longitudinal fiber bundle 3 and the second longitudinal fiber bundle 3' distributed in the fiber web, so as to give full play to the advantages and disadvantages of the nonwoven fabric. In this embodiment, the first fiber web 1 is composed of weakly hydrophilic fibers, which have a slower permeation speed but a good anti-backflow effect. The second longitudinal fiber bundle 3' that runs through it is composed of the same hydrophilic fibers as the fibers in the second fiber web 2, so it can effectively improve the permeation speed. Similarly, the first longitudinal fiber bundle 3 that runs through it can also improve the anti-backflow 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 better compressive strength to the nonwoven fabric, while the use of hot air setting can maintain the bulkiness of the fiber web to the greatest extent.

[0046] Example 4

[0047] like Figure 7 As shown, this utility model discloses a nonwoven fabric 12 with longitudinal flow guiding function, comprising a first fiber web 1 and a second fiber web 2. The first fiber web layer 1 has a plurality of discretely distributed first longitudinal fiber bundles 3, the fibers of the first longitudinal fiber bundles 3 being the same as the fibers in the first fiber web 1. The second fiber web 2 has a plurality of discretely distributed second longitudinal fiber bundles 3', the fibers of the second longitudinal fiber bundles 3' being the same as the fibers in the second fiber web 2.

[0048] In this embodiment: the distribution density of the first longitudinal fiber bundle 3 is 30 bundles / cm. 2 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 network 1 and the second longitudinal fiber bundle 3' in the second fiber network 2 can also be staggered.

[0049] The first longitudinal fiber bundle 3 and the second longitudinal fiber bundle 3' can protrude 0-8 mm, preferably 2-6 mm, from the surface of the fiber web; the first fiber web 1 is composed of 100% 1.2 dtex weakly hydrophilic bicomponent fiber with a basis weight of 15 gsm, and the second fiber web 2 is composed of 60% 3.0 dtex hydrophilic polyester fiber PET and 40% low melting point polyester fiber coPET with a basis weight of 10 gsm.

[0050] The manufacturing method of the nonwoven fabric 12 with longitudinal flow guiding function of this utility model is the same as the manufacturing method in Embodiment 3, except that: during the needle punching process, the moving distance of the needles in the needle punching device is controlled so that the first longitudinal fiber bundle 3 exists only in the first fiber web 1, and the second longitudinal fiber bundle 3' exists only in the second fiber web 2. By adjusting the distribution and number of needles, the distribution of the first longitudinal fiber bundle 3 and the second longitudinal fiber bundle 3' can be adjusted to meet the needs of nonwoven fabrics for different applications.

[0051] After adopting the above scheme, in this embodiment, the nonwoven fabric 12 with longitudinal flow guiding function 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 in the first longitudinal fiber bundle 3 is greater than the number of fiber bundles in the second longitudinal fiber bundle 3'. The first fiber web 1 has a larger number of first longitudinal fiber bundles 3, which can quickly guide the liquid along the first longitudinal fiber bundles 3 to the second fiber web 2, accelerating the liquid penetration and absorption; while the second fiber web 2 has a smaller number of second longitudinal fiber bundles 3', which can both accelerate the longitudinal flow of liquid to the absorbent core and prevent the liquid from back-seeping along the second longitudinal fiber bundles 3' due to an excessive number of second longitudinal fiber bundles 3'. Since the first longitudinal fiber bundles 3 and the second longitudinal fiber bundles 3' do not penetrate through the nonwoven fabric 12, even if absorbed liquid back-seeps along the second longitudinal fiber bundles 3', it only back-seeps into the second fiber web 2, and also prevents the liquid from directly back-seeping to the surface layer of the nonwoven fabric 12 along the first longitudinal fiber bundles 3 and the second longitudinal fiber bundles 3' that penetrate through 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 either the first fiber web or the second fiber web has a plurality of discretely distributed longitudinal fiber bundles, the distribution density of which is 1 to 50 bundles / cm. 2 The fibers of the longitudinal fiber bundle are the same as those in the fiber web.

2. The nonwoven fabric with longitudinal flow guiding function as described in claim 1, characterized in that: The first fiber web is a bicomponent fiber, a low-melting-point fiber, or a polyester fiber; the second fiber web is a bicomponent fiber, a low-melting-point fiber, or a polyester fiber.

3. The nonwoven fabric with longitudinal flow guiding function as described in claim 1, characterized in that: The basis weight of the first fiber web is 10-50 gsm, and the basis weight of the second fiber web is 10-50 gsm.

4. The nonwoven fabric with longitudinal flow guiding function as described in claim 1, characterized in that: Both the first fiber web and the second fiber layer have several discretely distributed longitudinal fiber bundles.

5. The nonwoven fabric with longitudinal flow guiding function as described in claim 4, characterized in that: The longitudinal fiber bundle passes through the first fiber web and the second fiber web, and the fibers of the longitudinal fiber bundle are the same as the fibers in the second fiber web.

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

7. The nonwoven fabric with longitudinal flow guiding function as described in claim 5, characterized in that: The first fiber web has lower hydrophilicity than the second fiber web.

8. The nonwoven fabric with longitudinal flow guiding function as described in claim 4, characterized in that: The longitudinal fiber bundle includes a first longitudinal fiber bundle and a second longitudinal fiber bundle that both penetrate 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 as described in claim 4, characterized in that: The longitudinal fiber bundles in the first fiber web and the longitudinal fiber bundles in the second fiber web are interspersed in the respective fiber webs.

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

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