One-way moisture-wicking nonwoven fabric for the surface layer of sanitary products and absorbent sanitary products
By layering and connecting hydrophobic and hydrophilic fiber webs, a one-way moisture-wicking nonwoven fabric is formed, which solves the problems of allergies and liquid backflow on the surface of hygiene products, and achieves better dryness performance and user experience.
Patent Information
- Application Number
- CN202521977915.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-15
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-09-15
AI Technical Summary
Existing hygiene product surface materials can easily cause allergic reactions in some people with sensitive skin during use, and their moisture absorption and liquid absorption properties can lead to user discomfort.
A hydrophobic first fiber web layer and a hydrophilic second fiber web layer are stacked and reinforced to form a unidirectional moisture-wicking nonwoven fabric. The hydrophobic layer serves as the contact surface, allowing liquid to be quickly introduced into the hydrophilic layer and preventing reverse penetration.
It improves the dryness of the surface layer of hygiene products, enhances water absorption and sweat absorption, effectively prevents liquid backflow, and is suitable for people with sensitive skin.
Smart Images
Figure CN224940757U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of nonwoven fabric technology, and in particular to a unidirectional moisture-wicking nonwoven fabric for the surface layer of sanitary products and absorbent sanitary products. Background Technology
[0002] Most existing sanitary products use hot-air nonwoven fabric for their surface layer, such as sanitary napkins and diapers. Hot-air nonwoven fabric is made by melting and bonding thermoplastic synthetic fibers through a fiber web using hot air. The main raw materials are polyester, nylon, and polypropylene fibers. As a synthetic fiber product, hot-air nonwoven fabric is popular with consumers due to its fluffy, soft feel and excellent permeability. However, some people with sensitive skin may experience allergic reactions when using sanitary products containing hot-air nonwoven fabric. A few existing sanitary products use cotton-layered surface layers. While these have good skin-friendly properties and are suitable for sensitive skin, their strong moisture absorption and the inherent liquid-absorbing characteristics of the fibers can cause discomfort for users. Utility Model Content
[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a one-way moisture-wicking nonwoven fabric for the surface layer of sanitary products and absorbent sanitary products, so as to improve the dryness performance of the surface layer of sanitary products.
[0004] The objective of this utility model is achieved through the following technical solution:
[0005] A unidirectional moisture-wicking nonwoven fabric for the surface layer of hygiene products, comprising:
[0006] The first fiber web layer is a hydrophobic fiber.
[0007] The second fiber web layer is made of hydrophilic fiber and is stacked and reinforced with the first fiber web layer.
[0008] In one specific embodiment, the fiber weight of the first fiber web layer accounts for 30-50% of the total weight of the nonwoven fabric.
[0009] In one specific embodiment, the fiber length of the first fiber web layer is 30mm-50mm, and the fineness is 0.5D-6D; and / or,
[0010] The fiber length of the second fiber web is 30mm-50mm, and the fineness is 0.5D-6D.
[0011] In one specific embodiment, the fineness of the fibers in the first fiber web layer is 0.5-3.0D, and the fineness of the fibers in the second fiber web layer is 0.5-3.0D.
[0012] In one specific embodiment, the first fiber web layer is a cross-fiber web structure, and the second fiber web layer is a straight-lay fiber web structure.
[0013] In one specific embodiment, the basis weight of the nonwoven fabric is 10-60 g / m². 2 The thickness is 0.2-1.0mm.
[0014] In one specific embodiment, the basis weight of the nonwoven fabric is 20-50 g / m². 2 .
[0015] In one specific embodiment, the first fiber web layer has a mesh pattern, and the second fiber web layer has a plain weave.
[0016] In one specific embodiment, the material of the first fiber web layer is one of man-made cellulose fiber, man-made protein fiber, and polylactic acid fiber;
[0017] The material of the second fiber web layer is one of man-made cellulose fiber, man-made protein fiber, polylactic acid fiber, or synthetic fiber.
[0018] An absorbent sanitary product, comprising:
[0019] Absorbent layer, used to absorb liquid;
[0020] The surface layer is made of the unidirectional moisture-wicking nonwoven fabric used for the surface layer of sanitary products, and the surface layer is stacked with the absorbent layer, wherein the first fiber web layer is used as the contact surface that comes into contact with the skin.
[0021] In one specific embodiment, the absorbent sanitary products are one of the following: sanitary napkins, women's sanitary pants, diapers, diaper pads, diaper mats, nursing pads, and sanitary liners.
[0022] Compared with the prior art, the beneficial effects of this utility model include at least the following:
[0023] By stacking and reinforcing a hydrophobic first fiber web layer and a hydrophilic second fiber web layer together, a one-way moisture-wicking nonwoven fabric with a hydrophobic contact surface is formed for the surface layer of hygiene products. When the first fiber web layer comes into contact with the skin, the liquid excreted by the human body first contacts the first fiber web layer. The hydrophobic property of the first fiber web layer enables the liquid to be quickly introduced into the hydrophilic second fiber web layer, and the liquid cannot or is difficult to penetrate back into the first fiber web layer. Therefore, the water-repellent properties of the contact surface and the hydrophilic second fiber web layer work together to achieve the one-way moisture-wicking function of the nonwoven fabric for the surface layer of this product, which greatly improves the dryness performance of the nonwoven fabric for the surface layer of hygiene products. It has good water absorption, sweat absorption and drying properties, and can effectively prevent liquid backflow. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the unidirectional moisture-wicking nonwoven fabric used for the surface layer of hygiene products before lamination, according to an embodiment of this utility model. Detailed Implementation
[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.
[0026] The terms used to describe position and direction in this utility model are illustrated with the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this utility model.
[0027] Reference Figure 1 This utility model provides a unidirectional moisture-wicking nonwoven fabric for the surface layer of hygiene products, comprising: a first fiber web layer 1 and a second fiber web layer 2.
[0028] The first fiber web layer 1 is a hydrophobic fiber and serves as the contact surface. The material of the first fiber web layer 1 can be one or a combination of hypoallergenic, skin-friendly, and biodegradable synthetic cellulose fibers, synthetic protein fibers, and polylactic acid fibers. The first fiber web layer 1 made from the above materials has good skin-friendly properties and is suitable for people with sensitive skin. The hydrophobic fiber can be a water-repellent or semi-water-repellent fiber. Hydrophobic fibers have low surface tension, making it difficult or impossible for liquids to wet the surface. The water-repellent property of the first fiber web layer 1 can be formed by the properties of the fiber itself, or by immersing the fiber in a water-repellent solution or spraying the fiber with a water-repellent solution. The water-repellent solution can use a known finishing agent, ultimately giving the first fiber web layer 1 water-repellent or semi-water-repellent properties.
[0029] The second fiber web 2 can be a hydrophilic or hydrophobic fiber. Preferably, the second fiber web 2 is a hydrophilic fiber, which has good water absorption. The hydrophilic properties of the hydrophilic fiber can be obtained by improving its structure, such as increasing the number of hydrophilic groups in the molecular structure, the strength of the hydrophilicity of the hydrophilic groups, and the size and number of internal voids in the fiber. The hydrophilic properties of the second fiber web 2 can be obtained by improving the fiber structure in known ways. In one specific embodiment, the material of the second fiber web 2 can be one or a combination of biodegradable man-made cellulose fibers, man-made protein fibers, polylactic acid fibers, and synthetic fibers. The second fiber web 2 and the first fiber web 1 are stacked on top of each other and then reinforced by a hydroentangling process. The hydroentangling process allows the fibers to be tightly and evenly interwoven, forming a strong and soft mesh substrate. This process not only enhances the durability of the fabric but also ensures breathability and reduces discomfort from dampness.
[0030] Therefore, by stacking and reinforcing the hydrophobic first fiber web layer 1 and the hydrophilic second fiber web layer 2 together, a one-way moisture-wicking nonwoven fabric with a hydrophobic contact surface for use as the surface layer of hygiene products is formed. When the first fiber web layer 1 comes into contact with the skin, the liquid excreted by the human body first contacts the first fiber web layer 1. The hydrophobic property of the first fiber web layer 1 enables the liquid to be quickly introduced into the hydrophilic second fiber web layer 2, and the liquid cannot or is difficult to penetrate back into the first fiber web layer 1. Therefore, the water-repellent property of the contact surface and the hydrophilic second fiber web layer 2 work together to achieve the one-way moisture-wicking function of the nonwoven fabric for the surface layer of this product, which greatly improves the dryness performance of the nonwoven fabric for the surface layer of the hygiene products. It has good water absorption, sweat absorption and drying properties, and can effectively prevent liquid backflow.
[0031] In a preferred embodiment, the fiber weight of the first fiber web layer 1 accounts for 10-95% of the total nonwoven fabric, preferably 30-50% of the total nonwoven fabric. With the above proportion, the resulting one-way moisture-wicking nonwoven fabric for the surface layer of hygiene products can maintain better one-way moisture-wicking function and effectively avoid liquid backflow.
[0032] The fiber length of the first fiber web layer 1 is preferably 30mm-50mm, and the fineness is preferably 0.5D-6D. More preferably, the fineness of the fibers in the first fiber web layer 1 is 0.5-3.0D. Using the above parameters, the first fiber web layer 1 forms a cross-fiber web structure through a cross-laying method, making the first fiber web layer 1 more compact, softer, and more delicate to the touch, and more suitable for surface layers and contact with the skin.
[0033] The fiber length of the second fiber web layer 2 is 30mm-50mm, and the fineness is preferably 0.5D-6D, more preferably 0.5-3.0D. Using the above parameters, the second fiber web layer 2 forms a straight-laid fiber web structure through a flat-laying and carding process, resulting in better flow conduction and facilitating the introduction of liquid from the first fiber web layer 1 into the second fiber web layer 2.
[0034] The first fiber web layer 1 is preferably a mesh pattern. This mesh structure is not only aesthetically pleasing but also practical, quickly guiding liquid through tiny pores to effectively reduce surface residue and maintain a dry feel. The mesh design of the instant-absorbent surface accelerates liquid penetration into the absorbent layer, reducing the risk of backflow and allowing consumers to enjoy lasting dryness and comfort even on heavy flow days. The first fiber web layer 1 preferably employs a hydroentangling process, tightly and evenly weaving the fibers together to form a strong yet soft mesh substrate. This process not only enhances the fabric's durability but also ensures breathability, reducing discomfort from dampness.
[0035] The second fiber mesh layer 2 is preferably plain-weave, with a fine, smooth structure designed to provide a gentler, more skin-friendly feel. This layer primarily absorbs and locks in liquid, preventing side leakage and backflow. The second fiber mesh layer 2 also preferably utilizes a hydroentangling process, with tightly packed fibers on the plain surface forming a high-density flow-guiding layer. This effectively increases the liquid diffusion rate, allowing the liquid to be quickly absorbed by the core, locking in moisture and preventing backflow even under pressure.
[0036] The preferred basis weight of the nonwoven fabric is 10-60 g / m². 2 The basis weight of the nonwoven fabric is preferably 20-50 g / m². 2 The thickness is 0.2-1.0mm.
[0037] This utility model also provides an absorbent sanitary product, comprising: an absorbent layer and a surface layer.
[0038] Specifically, the absorbent layer is used to absorb liquids, such as fluids excreted by the human body, like urine.
[0039] The surface layer is made of the unidirectional moisture-wicking nonwoven fabric used for the surface layer of sanitary products. The surface layer is stacked with the absorbent layer. The first fiber mesh layer 1 is used as the contact surface that comes into contact with the skin. The second fiber mesh layer 2 faces the absorbent layer. The absorbent layer contains highly absorbent and highly moisturizing materials. Liquid that permeates from the first fiber mesh layer 1 to the second fiber mesh layer 2 is eventually absorbed by the absorbent layer.
[0040] Absorbent hygiene products include, but are not limited to, sanitary napkins, women's sanitary pants, diapers, diaper pads, diaper liners, nursing pads, and panty liners. When the absorbent hygiene product is a sanitary napkin, it may further include a breathable layer, a leak-proof layer, wings, etc., with the top layer, breathable layer, absorbent layer, and leak-proof layer sequentially laminated together, and the top layer being used for contact with the skin.
[0041] The aforementioned unidirectional moisture-wicking nonwoven fabric for the surface layer of hygiene products can be prepared by the following method: after stacking the first fiber web layer 1 and the second fiber web layer 2, it is reinforced by hydroentangling and dried to form the nonwoven fabric.
[0042] The first fiber web layer 1 is obtained by sequentially feeding cotton, coarse opening, blending cotton, carding, cross-laying, and drafting. The second fiber web layer 2 is obtained by sequentially feeding cotton, coarse opening, blending cotton, and flat carding into a web, or by sequentially feeding cotton, coarse opening, blending cotton, carding, cross-laying, and drafting. By cross-laying the first fiber web layer 1 and using flat carding or cross-laying for the second fiber web layer 2, and then combining the first and second fiber web layers 1 and 2 into a web and reinforcing it with hydroentangling, the permeability of the surface layer is greatly improved; on the other hand, the surface layer has a softer and more skin-friendly feel.
[0043] When using hydroentangled reinforcement, the hydroentanglement pressure of the first fiber web is selected according to the product weight, ranging from 20 to 40 bar, and the hydroentanglement pressure of the second fiber web is selected according to the product weight, ranging from 20 to 45 bar.
[0044] The drying process preferably uses hot air penetration, and the drying temperature is selected from 70-150℃ according to the product weight and characteristics.
[0045] The mechanical properties of the unidirectional moisture-wicking nonwoven fabric obtained by the above method for use as the surface layer of sanitary products are as follows: longitudinal strength ≥15N / 5cm, transverse strength ≥10N / 5cm; longitudinal elongation at break: 15-100%; transverse elongation at break: 40-150%. The spunlace nonwoven fabric obtained by this invention has low moisture reabsorption and excellent unidirectional moisture-wicking function. When used on the surface of sanitary products, it exhibits excellent dryness performance and effectively prevents liquid backflow. Simultaneously, the obtained spunlace nonwoven fabric has excellent mechanical properties and can be used as the surface layer of absorbent sanitary products such as sanitary napkins, diapers, and panty liners.
[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention, and all such changes should fall within the protection scope of the claims of the present invention.
Claims
1. A unidirectional moisture-wicking nonwoven fabric for the surface layer of sanitary products, characterized in that, include: The first fiber web layer is a hydrophobic fiber. The second fiber web layer is made of hydrophilic fiber and is stacked and reinforced with the first fiber web layer. The first fiber web layer has a mesh pattern, and the second fiber web layer has a plain weave.
2. The unidirectional moisture-wicking nonwoven fabric for the surface layer of sanitary products according to claim 1, characterized in that, The fiber weight of the first fiber web layer accounts for 30-50% of the total weight of the nonwoven fabric.
3. The unidirectional moisture-wicking nonwoven fabric for the surface layer of sanitary products according to claim 1, characterized in that, The fiber length of the first fiber web layer is 30mm-50mm, and the fineness is 0.5D-6D; and / or, The fiber length of the second fiber web is 30mm-50mm, and the fineness is 0.5D-6D.
4. The unidirectional moisture-wicking nonwoven fabric for the surface layer of sanitary products according to claim 3, characterized in that, The fineness of the fibers in the first fiber web layer is 0.5-3.0D, and the fineness of the fibers in the second fiber web layer is 0.5-3.0D.
5. The unidirectional moisture-wicking nonwoven fabric for the surface layer of sanitary products according to claim 1, characterized in that, The first fiber web layer is a cross-fiber web structure, and the second fiber web layer is a straight-lay fiber web structure.
6. The unidirectional moisture-wicking nonwoven fabric for the surface layer of sanitary products according to claim 1, characterized in that, The nonwoven fabric has a basis weight of 10-60 g / m². 2 The thickness is 0.2-1.0mm.
7. The unidirectional moisture-wicking nonwoven fabric for the surface layer of sanitary products according to claim 1, characterized in that, The material of the first fiber web layer is one of artificial cellulose fiber, artificial protein fiber, and polylactic acid fiber; The material of the second fiber web layer is one of man-made cellulose fiber, man-made protein fiber, polylactic acid fiber, or synthetic fiber.
8. An absorbent sanitary product, characterized in that, include: Absorbent layer, used to absorb liquid; The surface layer is made of a unidirectional moisture-wicking nonwoven fabric for the surface layer of sanitary products as described in any one of claims 1-7, the surface layer is stacked with the absorbent layer, and the first fiber web layer is used as the contact surface that comes into contact with the skin.
9. The absorbent sanitary product according to claim 8, characterized in that, The absorbent sanitary products mentioned are one of the following: sanitary napkins, women's sanitary pants, diapers, diaper pads, diaper mats, nursing pads, and sanitary liners.