Non-woven fabric for flow guide layer

Abstract

The utility model belongs to the technical field of non-woven fabrics of absorbent hygienic products, and discloses a non-woven fabric for a flow guide layer. The device is composed of a liquid anti-back-seepage layer, a liquid dispersion layer and a liquid leading-out layer. The topmost layer is a liquid back-seepage prevention layer, the middle layer is a liquid dispersion layer, and the bottom layer is a liquid leading-out layer; the liquid dispersing layer and the liquid leading-out layer are connected in an interpenetrating and entangling manner, and the liquid anti-back-seepage layer and the liquid dispersing layer are laid in sequence from top to bottom; the liquid leading-out layer and the liquid anti-back-seepage layer are not connected and are not in contact with each other; the longitudinal density of a net of the net layer in the liquid dispersion layer is not less than 1.5 times of the transverse density of the net. The good effects of diversion and back seepage prevention are achieved, and the comfort of a user is improved.

Description

Technical Field

[0001] This utility model belongs to the field of nonwoven fabric technology for absorbent hygiene products, and relates to a nonwoven fabric for a flow-guiding layer. Background Technology

[0002] The diversion layer, located between the surface layer and the absorbent core of an absorbent product, functions to enable the product to quickly, effectively, and evenly absorb liquids. If waste cannot be promptly and quickly diverted to other areas during use, localized blockages in the absorbent core due to excessive absorption can occur, leading to backflow. Currently available diversion layer products include perforated PE membranes, spunbond fabrics, and hot-air fabrics. These products present a trade-off between diversion effectiveness and backflow resistance. When diversion is effective, the product is prone to backflow, resulting in increased stickiness and user discomfort. Conversely, when designed to prevent backflow, the product offers little to no diversion, leading to excessive localized moisture absorption and impacting overall absorbency. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide a non-woven fabric for a flow guiding layer that has both flow guiding and anti-backflow effects, thereby improving the user's comfort.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a non-woven fabric for a flow guiding layer, which is composed of a liquid anti-backflow layer, a liquid dispersion layer, and a liquid outlet layer; the top layer is a liquid anti-backflow layer, the middle layer is a liquid dispersion layer, and the bottom layer is a liquid outlet layer; the liquid dispersion layer and the liquid outlet layer are interwoven and connected, and the liquid anti-backflow layer and the liquid dispersion layer are laid in sequence from top to bottom; the liquid outlet layer and the liquid anti-backflow layer are not connected and do not contact each other; the longitudinal density of the mesh layer in the liquid dispersion layer is not less than 1.5 times the transverse density of the mesh.

[0005] Furthermore, the fibers between the liquid dispersion layer and the liquid export layer are interwoven and entangled.

[0006] Furthermore, the liquid dispersion layer is a superhydrophilic, porous mesh layer. The length and width dimensions of the mesh openings in the mesh layer are not less than 3mm*2mm. The connection width between mesh openings is less than 5mm. The water absorption rate of the mesh is less than 1s. The liquid absorption rate of the mesh is less than 300%. This mesh layer is made from a knitted mesh layer, woven mesh layer, or hydroentangled mesh layer treated with a low-foaming penetrating agent.

[0007] Furthermore, the liquid anti-backflow layer is made of weakly hydrophilic microfiber. Its thickness is less than 0.2 mm, and its water permeability is greater than 98%. The fineness of the weakly hydrophilic microfiber is less than 0.5 dtex. The moisture regain of the weakly hydrophilic microfiber is less than 2%. The weakly hydrophilic microfiber is preferably a synthetic fiber.

[0008] Furthermore, the raw material for the liquid dispersion layer is cellulose fiber.

[0009] Furthermore, the liquid-exiting layer is composed of fiber web layer A and fiber web layer B laid sequentially from top to bottom; fiber web layers A and B are entangled and connected. Fiber web layers A and B have different moisture regain rates. Fiber web layer A has a moisture regain rate of less than 1% and a fiber fineness greater than 3 dtex. Fiber web layer B has a moisture regain rate greater than 7% and a fiber fineness no greater than 10 dtex.

[0010] Furthermore, the liquid-exiting layer is made of a mixed and carded web of fiber web layer A and fiber web layer B. The thickness is less than 0.5 mm. The water permeability is greater than 99%. The proportion of fiber web layer B is less than 30 wt%.

[0011] Furthermore, the raw material for fiber web layer A is either polyester fiber or polylactic acid fiber.

[0012] Furthermore, the raw material for fiber web layer B is viscose fiber.

[0013] The advantages of this utility model compared with the prior art are:

[0014] Compared with products on the market, the nonwoven fabric used in the flow guiding layer of this invention is a composite structure product. Liquid flows sequentially through a liquid anti-backflow layer made of weakly hydrophilic microfibers, to a liquid dispersion layer made of a superhydrophilic, porous mesh, and then to a liquid outlet layer made of a mixture of fibers with different moisture regain rates. The liquid achieves good dispersion during flow and is less likely to flow back to layer A. The product combines excellent flow guiding and anti-backflow effects, enhancing user comfort. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 This is a schematic diagram of the structure of a nonwoven fabric for a flow guiding layer according to this utility model.

[0017] In the diagram: 1. Liquid anti-backflow layer, 2. Liquid dispersion layer, 3. Liquid outlet layer. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

[0019] The present invention provides a nonwoven fabric for a flow guiding layer, which is a composite nonwoven fabric made by bonding a liquid dispersion layer to a liquid outlet layer on one side using high-pressure hydroentanglement technology and a liquid anti-backflow layer on the other side using an adhesive method.

[0020] The fibers between the liquid dispersion layer and the liquid outlet layer are interwoven and entangled; the liquid dispersion layer contains fibers from the liquid outlet layer, and vice versa. The liquid dispersion layer and the liquid anti-backflow layer are stacked and bonded together, but their fibers do not interweave. The liquid outlet layer and the liquid anti-backflow layer are not connected, and their fibers do not contact each other. Therefore, liquid can only flow from the liquid anti-backflow layer to the liquid dispersion layer and then to the liquid outlet layer; liquid flowing to the liquid outlet layer cannot return to the liquid anti-backflow layer.

[0021] This utility model provides a nonwoven fabric for a flow-guiding layer, such as... Figure 1 As shown, it consists of a liquid anti-backflow layer, a liquid dispersion layer, and a liquid outlet layer; the top layer is the liquid anti-backflow layer, the middle layer is the liquid dispersion layer, and the bottom layer is the liquid outlet layer; the liquid dispersion layer and the liquid outlet layer are interwoven and connected, and the liquid anti-backflow layer and the liquid dispersion layer are laid in a top-to-bottom order; the liquid outlet layer and the liquid anti-backflow layer are not connected and do not contact each other; the longitudinal density of the mesh layer in the liquid dispersion layer is not less than 1.5 times the transverse density of the mesh. The percentages in the embodiments are weight percentages.

[0022] Example 1

[0023] A nonwoven fabric for a flow-guiding layer, with a product specification of 60gsm. A 20gsm liquid-guiding layer 3 is made by mixing and carding a web of 20% viscose fiber (6dtex fineness) and 80% polyester fiber (6dtex fineness). This web is then bonded together with a 28gsm superhydrophilic woven web with 5mm long and 3mm wide pores via high-pressure hydroentangling. Next, a 12gsm weakly hydrophilic microfiber layer is formed by hot-melt spinning of 0.5% hydrophilic masterbatch and 95% PP masterbatch. At high temperature, a liquid anti-backflow layer 1 is directly sprayed onto a liquid dispersion layer 2. Through the action of heat, the liquid anti-backflow layer 1, liquid dispersion layer 2, and liquid-guiding layer 3 are bonded together, thus producing this flow-guiding layer nonwoven fabric.

[0024] Example 2

[0025] Product specifications: 50gsm. A 13gsm liquid-exporting layer 3 is made by blending and carding a 25% viscose fiber (6dtex fineness) and a 75% polyester fiber (4dtex fineness) web. This web is then bonded together with a 12gsm superhydrophilic knitted web (6mm pore diameter) using high-pressure hydroentangling. Next, a 25gsm weakly hydrophilic microfiber layer, made from hollow orange-segment microfiber (30% PA / 70% PET content) produced by high-pressure hydroentangling, is bonded to a liquid anti-backflow layer 1 onto a liquid dispersion layer 2 using a high-temperature hot-rolling method. Through the action of heat, the liquid anti-backflow layer 1, liquid dispersion layer 2, and liquid-exporting layer 3 are bonded together, thus creating this nonwoven fabric with a flow-guiding layer.

[0026] Example 3

[0027] Product specifications: 100gsm. A 40gsm liquid-exporting layer 3 is made by carding 100% polylactic acid fibers with a fineness of 4dtex into a web. This web is then bonded together with a 20gsm hydroentangled fabric with 8mm long and 5mm wide pores using high-pressure hydroentanglement. Next, a 40gsm weakly hydrophilic ultrafine fiber layer is made by hot-melt spinning 1 with 1% hydrophilic masterbatch and 99% PBS masterbatch. At high temperature, the liquid anti-backflow layer 1 is directly sprayed onto the liquid dispersion layer 2. Through the action of heat, the liquid anti-backflow layer 1, liquid dispersion layer 2, and liquid-exporting layer 3 are bonded together, thus creating this nonwoven fabric with a flow-guiding layer.

[0028] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A nonwoven fabric for a flow-guiding layer, characterized in that, It consists of a liquid anti-backflow layer (1), a liquid dispersion layer (2), and a liquid outlet layer (3); the top layer is the liquid anti-backflow layer (1), the middle layer is the liquid dispersion layer (2), and the bottom layer is the liquid outlet layer (3); the liquid dispersion layer (2) and the liquid outlet layer (3) are intertwined and connected to each other, and the liquid anti-backflow layer (1) and the liquid dispersion layer (2) are laid in order from top to bottom; the liquid outlet layer (3) and the liquid anti-backflow layer (1) are not connected and do not contact each other; the longitudinal density of the mesh layer in the liquid dispersion layer (2) is not less than 1.5 times the transverse density of the mesh.

2. The nonwoven fabric for a flow-guiding layer as described in claim 1, characterized in that, The fibers between the liquid dispersion layer (2) and the liquid export layer (3) are interwoven and entangled.

3. The nonwoven fabric for a flow-guiding layer as described in claim 1, characterized in that, The liquid dispersion layer (2) has a mesh size of not less than 3mm*2mm in length and width; the connection width between meshes is less than 5mm.

4. The nonwoven fabric for a flow-guiding layer as described in claim 1, characterized in that, Liquid anti-backflow layer (1), the raw material is weakly hydrophilic ultrafine fiber; the thickness is less than 0.2mm.

5. The nonwoven fabric for a flow-guiding layer as described in claim 1, characterized in that, The raw material for the liquid dispersion layer (2) is cellulose fiber.

6. The nonwoven fabric for a flow-guiding layer as described in claim 1, characterized in that, The liquid export layer (3) is composed of fiber web layer A and fiber web layer B laid in order from top to bottom; fiber web layer A and fiber web layer B are entangled and connected.

7. The nonwoven fabric for a flow-guiding layer as described in claim 1, characterized in that, The raw material for fiber web layer A is either polyester fiber or polylactic acid fiber; the fiber fineness is greater than 3 dtex.

8. The nonwoven fabric for a flow-guiding layer as described in claim 1, characterized in that, The raw material for fiber web layer B is viscose fiber.

9. The nonwoven fabric for a flow-guiding layer as described in claim 4, characterized in that, The fineness of weakly hydrophilic microfiber is less than 0.5 dtex.

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