Non-woven fabric with high water permeability

Abstract

The utility model relates to a non-woven fabric with high water permeability, which at least comprises a surface layer and a bottom layer, the surface layer is composed of first hydrophilic fibers, the bottom layer is composed of second hydrophilic fibers, the non-woven fabric is provided with a channel formed by pre-needling processing, the channel comprises a bottom end and a top end, the diameter of the bottom end is smaller than that of the top end, and the bottom end is located below the bottom layer. The top end is located on the surface layer, and the first hydrophilic fibers and the second hydrophilic fibers are mutually entangled or entangled and bonded in the extending direction of the channel. The non-woven fabric with the high water permeability has the advantages that different types of hydrophilic fibers on the bottom layer and the surface layer are entangled together through a pre-needling process, the tensile strength of the non-woven fabric is enhanced, an infiltration channel which is large in top and small in bottom and penetrates through the bottom layer is formed, and infiltration of liquid is accelerated and reverse osmosis of the liquid is effectively prevented through the capillary action.

Description

Technical Field

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

[0002] At present, many non-woven fabric materials used in sanitary napkins are prepared by multi-layer fiber webs. Since such non-woven fabrics need to have two characteristics of low gram weight and low roughness in order to have the due skin-friendly property and lightness during use, they are generally reinforced by processes such as hot air and spunlace. However, in this way, there is no interpenetration between the multi-layer fiber webs, and the produced non-woven fabric materials can only achieve the effect of a single layer, and cannot effectively combine the functions between different layers of fiber webs.

[0003] The Chinese patent "A preparation method of a pure cotton non-woven fabric product" with the publication number CN109629109A announced on April 16, 2019 discloses a preparation method of a pure cotton non-woven fabric product, including the following steps: opening, mixing and carding cotton fibers, and then cross-laying to form a cotton web; after the cotton web is formed, drawing the cotton web; after the drawing is completed, needling the cotton web to form a needled cotton web; then hydroentangling the needled cotton web, performing positive hydroentangling on the surface layer of the needled cotton web and reverse hydroentangling on the bottom layer to form a hydroentangled product with hydroentangled non-woven fabrics on both the surface layer and the bottom layer and a needled cotton web in the middle layer; finally, drying the hydroentangled product by means of flat screen drying to complete the preparation of the non-woven fabric product. However, the cotton web is fluffy, and even with the pre-needling process, it is impossible to effectively fix the web, and it is also difficult to form a downward infiltration channel and achieve high water permeability. Summary of the Utility Model

[0004] In order to solve the problems existing in the above-mentioned prior art, the purpose of the utility model is to provide a non-woven fabric with high water permeability.

[0005] The non-woven fabric with high water permeability described in the utility model includes at least a surface layer and a bottom layer. The surface layer is composed of a first type of hydrophilic fiber, and the bottom layer is composed of a second type of hydrophilic fiber. Channels formed by pre-needling are provided on the non-woven fabric. The channels include a bottom end and a top end, and the diameter of the bottom end is smaller than that of the top end. The bottom end is located below the bottom layer, and the top end is located on the surface layer. The first type of hydrophilic fiber and the second type of hydrophilic fiber are intertwined or intertwined and bonded along the channels.

[0006] Preferably, the intertwining method is three-dimensional intertwining.

[0007] Preferably, the first type of hydrophilic fiber and the second type of hydrophilic fiber are intertwined or intertwined and bonded, and an inverted mushroom-shaped protrusion is formed below the bottom layer.

[0008] Preferably, the pre-needling process is an upward needling process.

[0009] Preferably, the non-woven fabric further includes at least one intermediate layer, and at least one of the intermediate layers is composed of fibers having water-repellent properties.

[0010] Preferably, the first type of hydrophilic fibers includes fine-denier hydrophilic ES fibers or the first type of bicomponent fibers; the second type of hydrophilic fibers includes hydrophilic ES fibers or the second type of bicomponent fibers; the fibers having water-repellent properties include coarse-denier water-repellent ES fibers, coarse-denier weakly water-repellent ES fibers or the third type of bicomponent fibers.

[0011] Preferably, the non-woven fabric is reinforced by a hot air process.

[0012] Preferably, the first type of hydrophilic fibers includes skin-friendly hydrophilic fibers or fine-denier hydrophilic fibers; the second type of hydrophilic fibers includes ordinary hydrophilic ES fibers or bicomponent fibers; the fibers having water-repellent properties include water-repellent fibers or weakly water-repellent fibers.

[0013] Preferably, the first type of hydrophilic fibers includes hydrophilic cotton, viscose fiber, fine-denier hydrophilic polyester, fine-denier hydrophilic ES fibers; the second type of hydrophilic fibers includes hydrophilic cotton, viscose fiber, hydrophilic polyester; the fibers having water-repellent properties include water-repellent cotton, coarse-denier water-repellent polyester, coarse-denier ES fibers.

[0014] Preferably, the non-woven fabric is reinforced by a hydroentangling process.

[0015] Preferably, the non-woven fabric is reinforced by a hydroentangling process or a hot air process.

[0016] For the non-woven fabric with high water permeability of the present utility model, its advantages are that different types of hydrophilic fibers on the bottom layer and the surface layer are entangled or entangled and bonded together through the pre-needling process, enhancing its tensile strength, and forming a downwardly tapered seepage channel penetrating the bottom layer, accelerating the downward seepage of liquid through capillary action and effectively preventing liquid back-seepage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the non-woven fabric with high water permeability of the present utility model.

[0018] Description of the reference numerals:

[0019] 100 surface layer 200 bottom layer 300 channel 310 bottom end 311 inverted mushroom-shaped protrusion 320 top end 400 intermediate layer DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] As Figure 1As shown in the figure, a non-woven fabric with high water permeability according to the present utility model includes at least a surface layer 100 and a bottom layer 200. The surface layer 100 is composed of a first type of hydrophilic fiber, and the bottom layer 200 is composed of a second type of hydrophilic fiber. A channel 300 formed by pre-needling is provided on the non-woven fabric. The channel 300 includes a bottom end 310 and a top end 320, and the diameter of the bottom end 310 is smaller than that of the top end 320. The bottom end 310 is located below the bottom layer 200, and the top end 320 is located on the surface layer 100. The first type of hydrophilic fiber and the second type of hydrophilic fiber are entangled or entangled and bonded along the extending direction of the channel 300.

[0021] During specific implementation, the fiber webs of the surface layer 100 and the bottom layer 200 are respectively carded, and then pre-needled by an up-needling process after being superimposed by a wire mesh curtain. The implanted needle density used is 1000 - 3000 needles / m, the pre-needling frequency is 600 - 1500 rpm, and the needle punching stroke is 10 - 30 mm. The edge of the needle used for pre-needling has barbs. After pre-needling treatment, the first type of hydrophilic fiber penetrates through the fiber web of the bottom layer 200 along the pre-needling direction from the fiber web of the surface layer 100, and the second type of hydrophilic fiber is brought below the bottom layer 200 from the fiber web of the bottom layer 200 along the pre-needling direction by the same needle. Thereafter, the needle moves in the opposite direction of the pre-needling direction, and the first type of hydrophilic fiber and the second type of fiber are entangled with each other along the moving direction of the needle. When the needle detaches from the fiber webs of the surface layer 100 and the bottom layer 200, the channel 300 is formed. The channel 300 includes a bottom end 310 and a top end 320, and the diameter of the bottom end 310 is smaller than that of the top end 320. The bottom end 310 is located below the bottom layer 200, and the top end 320 is located on the surface layer 100. The first type of hydrophilic fiber and the second type of hydrophilic fiber are entangled or entangled and bonded along the extending direction of the channel 300. Preferably, the entanglement method is three-dimensional entanglement. Specifically, the first type of hydrophilic fiber and the second type of hydrophilic fiber can be fibers with different hydrophilic mechanisms, specifically including single-parent non-woven fabric fibers, multi-parent non-woven fabric fibers, and weakly hydrophilic non-woven fabric fibers. After entanglement, due to different hydrophilic abilities and hydrophilic infiltration methods, the best hydrophilic effect can be obtained through mutual cooperation during entanglement.

[0022] A non-woven fabric with high water permeability according to the present utility model has the advantage that different types of hydrophilic fibers on the bottom layer 100 and the surface layer 200 are entangled or entangled and bonded together through a pre-needling process, enhancing its tensile strength, and forming the channel 300 with a larger upper part and a smaller lower part and penetrating the bottom layer 200, accelerating the downward infiltration of liquid through capillary action and effectively preventing liquid backflow.

[0023] Preferably, the first type of hydrophilic fiber and the second type of hydrophilic fiber are entangled or entangled and bonded with each other, and an inverted mushroom-shaped protrusion 311 is formed under the bottom layer 200.

[0024] In specific implementation, when the needle penetrates the fiber web of the top layer 100 and the fiber web of the bottom layer 200 and then moves in the opposite direction of the pre-needling direction, the needle will hook the first type of hydrophilic fiber and the second type of hydrophilic fiber, causing them to entangle with each other, and causing the first type of hydrophilic fiber and the second type of hydrophilic fiber to form an inverted mushroom-shaped protrusion 311 under the bottom layer 200. After the inverted mushroom-shaped protrusion 311 contacts the sanitary napkin core body, void channels will be formed, which is beneficial to the diffusion of liquid and speeds up the absorption speed. When using a hot air consolidation process or other consolidation processes that bond the first type of hydrophilic fiber and the second type of hydrophilic fiber, the fibers in the inverted mushroom-shaped protrusion 311 can be entangled and bonded with each other. If the inverted mushroom-shaped protrusion 311 also contains other fibers that can be bonded to the first type of hydrophilic fiber and the second type of hydrophilic fiber through consolidation, then the fibers will be bonded to the first type of hydrophilic fiber and the second type of hydrophilic fiber in the inverted mushroom-shaped protrusion 311.

[0025] Preferably, the pre-needling process is an up-needling process.

[0026] In specific implementation, using the up-needling process can more effectively form the inverted mushroom-shaped protrusion 311, rather than causing the channels 300 and the inverted mushroom-shaped protrusion 311 to sag due to gravity after formation when using the down-needling process. And using the up-needling process can only form the channels 300 that are larger at the top and smaller at the bottom, and will not form channels that are smaller at the top and larger at the bottom, thereby avoiding or reducing back leakage.

[0027] Preferably, the non-woven fabric further includes at least one intermediate layer 400, and at least one of the intermediate layers 400 is composed of fibers with water-repellent properties.

[0028] In specific implementation, the type of fiber used in the intermediate layer 400 can be selected from the prior art according to actual needs to achieve different functions. It should be noted that at least one of the intermediate layers 400 is composed of fibers with water-repellent properties. The channel 300 passes through the intermediate layer 400, and the fibers with water-repellent properties are intertwined with the first type of hydrophilic fibers and the second type of hydrophilic fibers along the channel 300. The purpose of using this intermediate layer 400 is that when the liquid in the bottom layer 200 re-infiltrates towards the surface layer 100, due to the water-repellent effect of the intermediate layer 400, the liquid cannot pass through the intermediate layer 400 to reach the surface layer 100, which can achieve the anti-re-infiltration effect. The fibers with water-repellent properties can be intertwined or adhered after being intertwined with the first type of hydrophilic fibers and the second type of hydrophilic fibers.

[0029] Preferably, the first type of hydrophilic fibers includes fine-denier hydrophilic ES fibers or the first type of bicomponent fibers; the second type of hydrophilic fibers includes hydrophilic ES fibers or the second type of bicomponent fibers; the fibers with water-repellent properties include coarse-denier water-repellent ES fibers, coarse-denier weakly water-repellent ES fibers or the third type of bicomponent fibers.

[0030] In specific implementation, the fine-denier hydrophilic ES fibers or the first type of bicomponent fibers used for the surface layer 100, and the hydrophilic ES fibers or the second type of bicomponent fibers used for the bottom layer 200 can both be reinforced by the hot air process, thereby reducing the excessive surface roughness caused by pre-needling and avoiding too high a gram weight. Moreover, the fine-denier hydrophilic ES fibers or the first type of bicomponent fibers used for the surface layer 100 have a skin-friendly effect and are suitable for being used as the contact layer with the human skin. The coarse-denier water-repellent ES fibers, coarse-denier weakly water-repellent ES fibers or the third type of bicomponent fibers have a water-repellent effect, can achieve the anti-re-infiltration function, and can be reinforced by the hot air process.

[0031] Preferably, the non-woven fabric is reinforced by the hot air process.

[0032] Reinforcing the non-woven fabric by the hot air process can increase the entanglement at the contact surface positions of the surface layer 100, the intermediate layer 400 and the bottom layer 200, can further strengthen the adhesion strength between the materials of each layer, and at the same time, the hot air process can further enhance the softness of the material, reduce the damage to the softness of the material caused by the needling process, and achieve the reinforcement of the thermoplastic low-gram weight material.

[0033] Preferably, the first type of hydrophilic fibers includes skin-friendly hydrophilic fibers or fine-denier hydrophilic fibers; the second type of hydrophilic fibers includes ordinary hydrophilic ES fibers or bicomponent fibers; the fibers with water-repellent properties include water-repellent fibers or weakly water-repellent fibers.

[0034] In specific implementation, the skin-friendly hydrophilic fibers or fine-denier hydrophilic fibers for the surface layer 100, and the ordinary hydrophilic ES fibers or bicomponent fibers for the bottom layer 200 can both be strengthened by the hydrospun process, thereby reducing the excessive surface roughness caused by pre-needling and avoiding too high a gram weight. Moreover, the skin-friendly hydrophilic fibers or fine-denier hydrophilic fibers for the surface layer 100 have a skin-friendly effect and are suitable for use as the contact layer with the human skin. The water-repellent fibers or weakly water-repellent fibers have a water-repellent effect, can achieve the anti-backflow seepage function, and can be strengthened by the hydrospun process.

[0035] Preferably, the first type of hydrophilic fibers includes hydrophilic cotton, viscose fiber, fine-denier hydrophilic polyester, and fine-denier hydrophilic ES fiber; the second type of hydrophilic fibers includes hydrophilic cotton, viscose fiber, and hydrophilic polyester; the fibers with water-repellent properties include water-repellent cotton, thick-denier water-repellent polyester, and thick-denier ES fiber.

[0036] In specific implementation, the fiber types of the above-mentioned kinds can adopt the fiber types in the prior art, and those skilled in the art can select the fiber types in the prior art according to actual needs.

[0037] Preferably, the non-woven fabric is strengthened by the hydrospun process.

[0038] Strengthening the non-woven fabric by the hydrospun process can increase the entanglement of each layer of the non-woven fabric at the contact surface position, can further enhance the bonding strength between the materials of each layer. At the same time, the hydrospun process can further strengthen the softness of the material, reduce the damage to the softness of the material caused by the needling process, and achieve the strengthening of low-gram-weight materials. For the processing technology of the hydrospun type, the first type of hydrophilic fibers, the second type of hydrophilic fibers, and even the fibers with water-repellent properties can select the fibers suitable for the hydrospun processing technology.

[0039] Preferably, the non-woven fabric is strengthened by the hydrospun process or the hot air process.

[0040] Strengthening the non-woven fabric by the hot air process or the hydrospun process can increase the entanglement of each layer of the non-woven fabric at the contact surface position, can further enhance the bonding strength between the materials of each layer. At the same time, the hot air process or the hydrospun process can further strengthen the softness of the material, reduce the damage to the softness of the material caused by the needling process, and achieve the strengthening of low-gram-weight materials.

[0041] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0042] For those skilled in the art, according to the technical solutions and concepts described above, various corresponding changes and deformations can be made, and all such changes and deformations should fall within the protection scope of the claims of the present utility model.

Claims

1. A nonwoven fabric with high water permeability, characterized in that: include: At least a surface layer (100) and a bottom layer (200), the surface layer (100) being composed of a first type of hydrophilic fibers, the bottom layer (200) being composed of a second type of hydrophilic fibers, the non-woven fabric being provided with a channel (300) formed by pre-needling, the channel (300) comprising a bottom end (310) and a top end (320), the bottom end (310) having a smaller diameter than the top end (320), the bottom end (310) being located below the bottom layer (200), the top end (320) being located on the surface layer (100), and the first type of hydrophilic fibers and the second type of hydrophilic fibers being entangled with each other or entangled and bonded along the extension direction of the channel (300).

2. The nonwoven fabric with high water permeability according to claim 1, characterized in that: The first type of hydrophilic fibers and the second type of hydrophilic fibers are entangled or entangled and bonded to each other, and form an inverted mushroom-shaped protrusion (311) below the bottom layer (200).

3. The nonwoven fabric with high water permeability according to any one of claims 1 to 2, characterized in that: The non-woven fabric further comprises at least one middle layer (400), and at least one middle layer (400) is composed of fibers having water-repellent properties.

4. The nonwoven fabric with high water permeability according to claim 1, characterized in that: The nonwoven fabric is reinforced by hot air process.

5. The nonwoven fabric with high water permeability according to claim 1, characterized in that: The nonwoven fabric is reinforced by a hydroentanglement process.

Images