High-elastic non-woven fabric

Abstract

The utility model discloses a high-elastic non-woven fabric, and belongs to the technical field of non-woven fabrics. The high-elastic non-woven fabric comprises a first skin-friendly layer and a second skin-friendly layer, an elastic layer composed of a plurality of wavy elastic fibers is arranged between the first skin-friendly layer and the second skin-friendly layer, and the elastic layer and the skin-friendly layer are of an integrated structure through on-line compounding and fusion. The elastic layer is of an integrated fiber net-shaped structure, and wave crests of the longitudinally-arranged elastic fibers are fixedly connected with wave troughs of the transversely-arranged elastic fibers. The air permeability of the high-elastic non-woven fabric is larger than or equal to 1437 mm / s. Due to the structure of the elastic layer, the non-woven fabric can realize multidirectional elastic activation, and after activation treatment, the non-woven fabric can have good elasticity, excellent air permeability and skin friendliness.

Description

Technical Field

[0001] The utility model relates to the technical field of non-woven fabrics, and more particularly to a high-elastic non-woven fabric. Background Art

[0002] Elastic nonwovens include elastic spunbond and elastic composite. During the production process, elastic masterbatch is added to impart elastic properties to the nonwoven. However, this method often requires the addition of a large amount of elastic masterbatch, which may affect the properties of the nonwoven fibers themselves, resulting in reduced bulk and tactile feel. Furthermore, this material may become loose and inefficient during actual use. In contrast, the elasticity of elastic composite nonwovens primarily comes from the elastic layer. This method does not affect the properties of the fibers themselves, but may increase the overall weight of the nonwoven due to the increased surface density. This weight increase may limit the application range of the nonwoven.

[0003] In order to solve the above problems, the Chinese patent with publication number CN219007287U published on May 12, 2023 discloses an elastic non-woven fabric, which is able to deform by directly hot-melting two groups of cross-placed elastic threads with a cotton fiber mesh and a low-fiber mesh. However, the elasticity provided by this non-woven fabric only exists at the location where the elastic threads are located, which can easily cause the tensile strength of the non-woven fabric to be unevenly distributed, thereby shortening the service life of the non-woven fabric. In addition, during use, when the non-woven fabric is pulled by external force, the elastic threads are easily squeezed against the human skin under the action of the force, thereby producing a sense of tightening where the non-woven fabric contacts the human skin, especially where the elastic threads are located. The sense of tightening is more obvious. In addition, this process uses offline compounding, which has high production costs and low production efficiency. The elastic non-woven fabric after compounding can only be horizontal or vertical, and subsequent applications are not flexible.

[0004] Therefore, it is necessary to provide a non-woven fabric that is highly elastic, thin, easy to process, can be activated in the longitudinal and transverse directions according to the needs of the user, and is not prone to causing a sense of constriction where the non-woven fabric contacts the human skin. Utility Model Content

[0005] 1. Problem to be solved

[0006] In response to the problems existing in the prior art, the purpose of the present invention is to provide a high-elastic non-woven fabric, which has the characteristics of high elasticity, lightness, and easy processing; and the non-woven fabric can activate elasticity in the longitudinal or transverse direction at will according to the needs of the user, and at the same time is not easy to produce a sense of constriction where the non-woven fabric contacts the human skin.

[0007] 2. Technical solution

[0008] A highly elastic non-woven fabric comprises a first skin-friendly layer and a second skin-friendly layer, with an elastic layer composed of a plurality of wavy elastic fibers disposed between the first and second skin-friendly layers. The elastic layer, the first and second skin-friendly layers are composited and fused online to form an integrated structure. The elastic layer is an integrated fiber mesh structure, with the wave crests of the longitudinally disposed elastic fibers fixedly connected to the wave troughs of the transversely disposed elastic fibers. The highly elastic non-woven fabric has an air permeability of ≥1437 mm / s.

[0009] Furthermore, the fiber structure of the wavy elastic fiber is a sheath-core structure; the sheath-core structure includes an inner core and an outer sheath, the outer sheath completely covers the outer end of the inner core, and the ratio of the radius of the inner core to the thickness of the outer sheath is 1:1~9.

[0010] Furthermore, the fiber structure of the wavy elastic fiber is a parallel structure; the parallel structure includes a first parallel component and a second parallel component, the first parallel component and the second parallel component are combined in parallel, and the volume ratio of the first parallel component to the second parallel component is 1~9:9~1.

[0011] Furthermore, the surface density of the elastic layer is 5-100 g / m 2 The surface density of the first skin-friendly layer and the second skin-friendly layer is 5-100 g / m 2 ; In the highly elastic non-woven fabric, the volume proportion of the elastic layer is 10~80%, the volume proportion of the first skin-friendly layer is 10~80%, and the volume proportion of the second skin-friendly layer is 10~80%.

[0012] Furthermore, the first skin-friendly layer and the second skin-friendly layer are both made of composite fiber materials, and the fiber structure of the composite fiber materials is a parallel structure, the parallel structure includes a first parallel component and a second parallel component, and the volume ratio of the first parallel component to the second parallel component is 1-9:9-1. The volume ratio of the first parallel component to the second parallel component is preferably 1:1.

[0013] Furthermore, the materials of the first skin-friendly layer and the second skin-friendly layer are both composite fiber materials, and the fiber structures of the composite fiber materials are both eccentric structures. The eccentric structures include an eccentric inner core and an eccentric outer sheath, and the area ratio of the eccentric inner core and the eccentric outer sheath is 1:2~7; and the eccentric outer sheath covers 200~360° of the circumference of the eccentric inner core.

[0014] Furthermore, the gram weight of the high elastic non-woven fabric is 15-300 g / m 2 , thickness is 0.1~7mm.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. The high-elasticity nonwoven fabric of the present invention embeds an elastic layer composed of corrugated elastic fibers between the first and second skin-friendly layers. This not only improves the elasticity of the nonwoven fabric, but also preserves the original properties of the first and second skin-friendly layers, ensuring that the nonwoven fabric maintains its excellent elasticity without losing its original properties. The elastic layer utilizes an integrated fiber mesh structure, in which the crests of the longitudinally positioned elastic fibers are fixedly connected to the troughs of the transversely positioned elastic fibers. This structure provides additional elasticity to the nonwoven fabric. Furthermore, this structure effectively disperses stress when subjected to external forces, thereby reducing the load on individual fibers and significantly improving the durability and tensile strength of the nonwoven fabric. Furthermore, the high-elasticity nonwoven fabric not only exhibits high elasticity but also high air permeability.

[0018] 2. The elastic layer of the non-woven fabric provided by the present invention accounts for 10-80% of its volume; the first skin-friendly layer and the second skin-friendly layer each account for 10-80% of its volume. Such a proportion distribution enables the non-woven fabric to have high elongation at break and high elongation at break while also having high air permeability, longitudinal softness and transverse softness. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the micro three-dimensional structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the fiber structure involved in the present utility model.

[0021] Description of the numbers in the figure:

[0022] 1 first skin-friendly layer, 2 elastic layer, 3 second skin-friendly layer, 4 eccentric inner core, 5 eccentric outer sheath, 6 first parallel component, 7 second parallel component, 8 inner core, 9 outer sheath. DETAILED DESCRIPTION

[0023] Example 1:

[0024] like Figure 1 As shown, a highly elastic nonwoven fabric comprises a first skin-friendly layer 1, an elastic layer 2, and a second skin-friendly layer 3. The elastic layer 2 is positioned between the first and second skin-friendly layers 1 and 3. These layers can be produced on a mesh-belt machine's web-forming curtain. Therefore, the first and second skin-friendly layers 1 and 3 are only materials present in the production process and can be directly composited and consolidated online to form a single structure, thus maintaining the lightweight and thinness of the highly elastic nonwoven fabric. The elasticity of the highly elastic nonwoven fabric produced by this method is provided by the elastic layer 2, effectively preserving the properties of the first and second skin-friendly layers 1 and 3.

[0025] like Figure 1As shown, the elastic layer 2 is composed of highly elastic fibers. These fibers include first and second highly elastic fibers. Both the first and second highly elastic fibers are wavy; the crests of the first and second highly elastic fibers are fixedly connected, and the first and second highly elastic fibers are interconnected, making the nonwoven fabric less susceptible to loss of elasticity under excessive stress. Furthermore, this structure of the elastic layer 2 ensures uniform pressure distribution on the areas of the nonwoven fabric that contact the user's body during stretching. This uniform pressure distribution effectively avoids constriction in areas where the nonwoven fabric contacts the skin, significantly enhancing user comfort.

[0026] The specific process of online lamination is as follows: After being spun through a die, the first skin-friendly layer 1, elastic layer 2, and second skin-friendly layer 3 are laid directly onto the mesh curtain of the web forming machine after cold air drawing, main and auxiliary air extraction drawing, pre-pressing rollers or hot air knives, and then bonded and reinforced into a single structure through a hot calender / hydroentanglement machine / hot air blower / needling machine. This method effectively controls the elasticity of the elastic layer 2, greatly facilitating subsequent winding, separation, and application, making the nonwoven fabric easier to process and significantly improving production efficiency. Once the entire process is completed, users can choose to perform transverse or longitudinal activation treatment based on the desired performance of the final product, thereby imparting properties such as elasticity, high bulk, skin-friendliness, and good wrapping properties.

[0027] The fibers of the first skin-friendly layer 1 and the second skin-friendly layer 3 are composite fibers. The composite fibers have a parallel structure, which is divided into a first parallel component 6 and a second parallel component 7. The cross-sectional structure diagram is shown in FIG. Figure 2 As shown in part (b), the volume ratio of the two is 1:1; the materials of the first parallel component 6 and the second parallel component 7 are both PP materials. The structure of the high elastic fiber of the elastic layer 2 is a skin-core structure, which is divided into an inner core 8 and an outer sheath 9. The cross-sectional diagram of the skin-core structure is shown in FIG. Figure 2 As shown in section (c), the outer sheath 9 completely covers the outer core 8, with the ratio of the radius of the inner core 8 to the thickness of the outer sheath 9 being 1-9:9-1. The optimal flexibility, elongation, resilience, and tensile strength are adjusted according to actual needs, with a ratio of 1:1 being selected in this embodiment. Both the inner core 8 and the outer sheath 9 are made of a composite material of a styrene copolymer and an elastic material.

[0028] The structural design of this non-woven fabric enables it to have good elasticity. A tensile test showed that it can withstand a maximum tensile force of 28.3N and its elongation at break can reach 52.4%.

[0029] Example 2:

[0030] Combine Figure 2, this embodiment is described in detail. The difference between this embodiment and embodiment 1 is that the composite fibers of the first skin-friendly layer 1 and the second skin-friendly layer 3 of this embodiment are eccentric structures, and its cross-sectional schematic diagram is as shown in FIG. Figure 2 As shown in part (a). The eccentric structure is divided into an eccentric inner core 4 and an eccentric outer sheath 5; the volume ratio of the eccentric inner core 4 and the eccentric outer sheath 5 is 1:2~7, and the eccentric outer sheath 5 covers 200~360° of the circumference of the eccentric inner core 4. According to actual needs, the optimal softness, extension, resilience, tensile strength and other properties are adjusted. In this embodiment, the volume ratio of the eccentric inner core 4 and the eccentric outer sheath 5 is selected to be 1:3, and the eccentric outer sheath 5 covers 300° of the circumference of the eccentric inner core 4. The materials of the eccentric inner core 4 and the eccentric outer sheath 5 are both polypropylene copolymers. The structure of the high elastic fiber of the elastic layer 2 is a skin-core structure, and the cross-sectional schematic diagram of the skin-core structure is shown as follows. Figure 2 As shown in part (c), the ratio of the radius of the inner core 8 and the thickness of the outer sheath 9 of the skin-core structure is 1:5.

[0031] Example 3:

[0032] Combine Figure 2 , this embodiment is described in detail. The difference between this embodiment and embodiment 1 is that the structure of the composite fiber of the first skin-friendly layer 1 of this embodiment is an eccentric structure, and its cross-sectional schematic diagram is shown in part (a), and the volume ratio of the eccentric inner core 4 and the eccentric outer sheath 5 is 1:2, and the eccentric outer sheath 5 covers 360° of the circumference of the eccentric inner core 4; the structure of the composite fiber of the second skin-friendly layer 3 is a parallel structure, and its cross-sectional schematic diagram is shown in part (b), and the volume ratio of the first parallel component 6 and the second parallel component 7 is 1:9. The structure of the high elastic fiber of the elastic layer 2 is a skin-core structure, and the cross-sectional schematic diagram of the skin-core structure is shown in FIG. Figure 2 As shown in part (c), the ratio of the radius of the inner core 8 and the thickness of the outer sheath 9 of the skin-core structure is 1:1.

[0033] Example 4:

[0034] Combine Figure 2 , this embodiment is described in detail. The difference between this embodiment and embodiment 1 is that the high elastic fibers of the elastic layer 2 of this embodiment are arranged in parallel. Its cross-sectional diagram is as follows: Figure 2 As shown in part (b), the volume ratio of the first parallel component 6 and the second parallel component 7 is 1:9. The composite fiber structure of the first skin-friendly layer 1 and the second skin-friendly layer 3 is a parallel structure, and its cross-sectional schematic diagram is shown as follows: Figure 2 As shown in part (b), the volume ratio of the first parallel component 6 and the second parallel component 7 is 9:1.

[0035] Example 5:

[0036] The difference between this embodiment and embodiment 1 is that the composite fiber structure of the first skin-friendly layer 1 and the second skin-friendly layer 3 of this comparative example are both single-component structures, and the structure of the high elastic fiber of the elastic layer 2 is also a single-component structure; its schematic diagram is as follows Figure 2 As shown in part (d).

[0037] Example 6:

[0038] The difference between this embodiment and embodiment 1 is that the high elastic fiber of the elastic layer 2 of this comparative example is an eccentric structure, and its cross-sectional diagram is as shown in FIG. Figure 2 As shown in part (a), the volume ratio of the eccentric inner core 4 and the eccentric outer sheath 5 is 1:7, and the eccentric outer sheath 5 covers 200° of the circumference of the eccentric inner core 4. The composite fiber structure of the first skin-friendly layer 1 and the second skin-friendly layer 3 is a skin-core structure. The cross-sectional schematic diagram of the skin-core structure is shown in FIG. Figure 2 As shown in part (c), the ratio of the radius of the inner core 8 and the thickness of the outer sheath 9 of the skin-core structure is 1:9.

[0039] Comparative Example 1:

[0040] A plurality of elastic yarns are spaced apart between the first skin-friendly layer 1 and the second skin-friendly layer 3. After the first skin-friendly layer 1, the elastic yarns and the second skin-friendly layer 3 are prepared, they are compounded and sintered into a non-woven fabric. The spacing between the elastic yarns is 3 mm.

[0041] Test Example 1:

[0042] 95g of the high-elastic non-woven fabrics of Examples 1 to 6 and Comparative Example 1 were selected and subjected to a tensile test. The test results are shown in the following table:

[0043] Table 1 Tensile test results of high elastic nonwoven fabrics involved in Examples 1 to 6 and Comparative Example 1

[0044]

[0045] It can be seen from the data in Table 1 that the breaking strength, breaking elongation, breaking strength and breaking elongation of the non-woven fabric prepared by this scheme are more than twice that of the comparative example; these data indicate that the non-woven fabric prepared by this scheme can better withstand tensile force without breaking, and thus has good ductility.

[0046] Test Example 2:

[0047] After mechanical activation, the high-elastic non-woven fabrics involved in Examples 1 to 6 and Comparative Example 1 were tested for air permeability and softness. The softness test was conducted in accordance with GB / T8942-2016; the air permeability test was conducted in accordance with GB / T5453-1997. The test results are shown in the following table:

[0048] Table 2 Test results of air permeability and softness of high elastic nonwoven fabrics in Examples 1 to 6 and Comparative Example 1

[0049]

[0050] As can be seen from Table 2, the non-woven fabric prepared by this scheme has a longitudinal softness of more than 17.33 mm / N after activation; the transverse softness can reach more than 18.23 mm / N; the air permeability can reach more than 1437 mm / s, which is significantly higher than the air permeability, longitudinal softness and transverse softness of the non-woven fabric prepared in Comparative Example 1; these data indicate that the non-woven fabric prepared by this scheme can have better softness and good air permeability in the transverse and longitudinal directions after mechanical activation.

Claims

1. A high-elastic non-woven fabric, characterized by: The invention comprises a first skin-friendly layer (1) and a second skin-friendly layer (3), wherein an elastic layer (2) composed of a plurality of wavy elastic fibers is provided between the first skin-friendly layer (1) and the second skin-friendly layer (3); the first skin-friendly layer (1), the elastic layer (2) and the second skin-friendly layer (3) are composited and melted online to form an integrated structure; the elastic layer (2) is an integrated fiber mesh structure, and the wave crests of the longitudinally arranged elastic fibers are fixedly connected to the wave troughs of the transversely arranged elastic fibers; the air permeability of the high-elastic non-woven fabric is ≥1437 mm / s.

2. The high-elastic non-woven fabric according to claim 1, characterized in that: The fiber structure of the wavy elastic fiber is a skin-core structure; the skin-core structure includes an inner core (8) and an outer sheath (9), the outer sheath (9) completely covers the outer end of the inner core (8), and the ratio of the radius of the inner core (8) to the thickness of the outer sheath (9) is 1:9~1.

3. The high-elastic non-woven fabric according to claim 1, characterized in that: The fiber structure of the wavy elastic fiber is a parallel structure; the parallel structure includes a first parallel component (6) and a second parallel component (7), the first parallel component (6) and the second parallel component (7) are combined in parallel, and the volume ratio of the first parallel component (6) to the second parallel component (7) is 1~9:9~1.

4. The high-elastic non-woven fabric according to claim 1, characterized in that: The surface density of the elastic layer (2), the first skin-friendly layer (1) and the second skin-friendly layer (3) are all 5-100 g / m 2 In the highly elastic non-woven fabric, the volume proportion of the elastic layer (2) is 10-80%, the volume proportion of the first skin-friendly layer (1) is 10-80%, and the volume proportion of the second skin-friendly layer (3) is 10-80%.

5. The high-elastic non-woven fabric according to claim 1, characterized in that: The first skin-friendly layer (1) and the second skin-friendly layer (3) are both made of composite fiber materials, and the fiber structures of the composite fiber materials are both parallel structures. The parallel structures include a first parallel component (6) and a second parallel component (7), and the volume ratio of the first parallel component (6) to the second parallel component (7) is 1~9:9~1.

6. The high-elastic non-woven fabric according to claim 1, characterized in that: The first skin-friendly layer (1) and the second skin-friendly layer (3) are both made of composite fiber materials, and the fiber structure of the composite fiber materials is an eccentric structure. The eccentric structure includes an eccentric inner core (4) and an eccentric outer sheath (5); the volume ratio of the eccentric inner core (4) to the eccentric outer sheath (5) is 1:2-7; and the eccentric outer sheath (5) covers 200-360° of the circumference of the eccentric inner core (4).

7. The high-elastic nonwoven fabric according to claim 1, characterized in that: The high elastic non-woven fabric has a grammage of 15 to 300 g / m 2 , thickness is 0.1~7mm.

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