Ultra-thin water-retaining breathable sanitary towel

Abstract

The utility model relates to the technical field of sanitary napkins, in particular to an ultra-thin water-retaining breathable sanitary napkin. The sanitary towel comprises a water-blocking breathable film layer, an adhesive layer, a water retention layer, a water guide layer and a hydrophobic layer, the adhesive layer is arranged on the upper surface of the water-blocking breathable film layer, the water retention layer is arranged on the upper surface of the adhesive layer, the water guide layer is arranged on the upper surface of the water retention layer, and the hydrophobic layer is arranged on the upper surface of the water guide layer. The ultra-thin water-retaining breathable sanitary towel is sequentially provided with the water-blocking breathable film layer, the adhesive layer, the water-retaining layer, the water-guiding layer and the hydrophobic layer from bottom to top, the water-guiding layer and the hydrophobic layer are attached to each other, due to the fact that the hydrophilic and hydrophobic difference between the water-guiding layer and the hydrophobic layer is large, a differential capillary effect is formed, water can be guided into the water-guiding layer from the hydrophobic layer and then enters the water-retaining layer, and therefore the water-retaining breathable sanitary towel is formed. The water retention layer is good in water retention capacity, so that the sanitary towel can guide water in one direction and keep excellent water absorption performance; the sanitary napkin can quickly and unidirectionally conduct moisture and has the advantages of being light, breathable, good in water retention and the like.

Description

Technical Field

[0001] This utility model relates to the field of sanitary napkin technology, specifically to an ultra-thin, water-retaining, and breathable sanitary napkin. Background Technology

[0002] Sanitary napkins, a commonly used hygiene product for women, are primarily used during menstruation. They consist of three layers from the inside out: a top layer, an absorbent core, and a bottom layer. Because sanitary napkins are worn directly against the body, their safety, absorbency, and breathability significantly impact women's health, comfort, and convenience. Currently, lightweight, comfortable, and breathable ultra-thin sanitary napkins are increasingly favored by female consumers. Due to their limited thickness, ultra-thin sanitary napkins require high absorbency and absorbency from the absorbent core. However, current technologies often employ two approaches: firstly, increasing the absorbency of the core usually requires increasing the overall thickness of the sanitary napkin, resulting in a thicker overall product that affects comfort; secondly, reducing the thickness of ultra-thin sanitary napkins can compromise absorbency and absorbency, necessitating further improvements. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide an ultra-thin water-retaining and breathable sanitary napkin. The sanitary napkin can quickly wick away moisture in one direction and has the advantages of being lightweight, breathable, and having good water retention, making it highly practical.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an ultra-thin water-retaining and breathable sanitary napkin, comprising a water-resistant and breathable membrane layer, an adhesive layer, a water-retaining layer, a water-conducting layer, and a hydrophobic layer, wherein the adhesive layer is disposed on the upper surface of the water-resistant and breathable membrane layer, the water-retaining layer is disposed on the upper surface of the adhesive layer, the water-conducting layer is disposed on the upper surface of the water-retaining layer, and the hydrophobic layer is disposed on the upper surface of the water-conducting layer.

[0005] Furthermore, the water-retaining layer is a superabsorbent polymer layer, which includes multiple interconnected superabsorbent polymer particles, and the superabsorbent polymer particles are bonded to the upper surface of the adhesive layer.

[0006] Furthermore, the particle size of the superabsorbent polymer particles is 40-100 mesh.

[0007] Furthermore, the water-conducting layer is a hydrophilic non-woven fabric layer.

[0008] Furthermore, the water-conducting layer is a PP hydrophilic nonwoven fabric layer.

[0009] Furthermore, the thickness of the water-conducting layer is 0.1-0.5 mm.

[0010] Furthermore, the hydrophobic layer is a water-repellent nonwoven fabric layer.

[0011] Furthermore, the hydrophobic layer is a PP water-repellent nonwoven fabric layer.

[0012] Furthermore, the thickness of the hydrophobic layer is 0.02-0.15 mm.

[0013] Furthermore, the adhesive layer is a pressure-sensitive adhesive or a hot melt adhesive.

[0014] Furthermore, the thickness of the adhesive layer is 0.005-0.1 mm.

[0015] Furthermore, the water-blocking and breathable membrane layer is a PE water-blocking and breathable membrane layer, a TPU water-blocking and breathable membrane layer, a PP water-blocking and breathable membrane layer, or a PS water-blocking and breathable membrane layer.

[0016] Furthermore, the water-blocking and breathable membrane layer 11 is a water-blocking and breathable non-woven fabric or a water-blocking and breathable knitted fabric.

[0017] Furthermore, the thickness of the water-resistant and breathable membrane layer is 0.03-0.1 mm.

[0018] Furthermore, the area of ​​the water-conducting layer is larger than the area of ​​the water-retaining layer, and the four edges of the water-conducting layer are bonded to the water-blocking and breathable membrane layer.

[0019] Furthermore, the area of ​​the hydrophobic layer is larger than the area of ​​the water-conducting layer, and the four edges of the hydrophobic layer are attached to the four edges of the water-blocking and breathable membrane layer.

[0020] The beneficial effects of this utility model are as follows: The ultra-thin water-retaining and breathable sanitary napkin of this utility model is provided with a water-resistant and breathable membrane layer, an adhesive layer, a water-retaining layer, a water-conducting layer, and a hydrophobic layer from bottom to top. The water-conducting layer and the hydrophobic layer are stacked. Due to the large difference in their hydrophilicity and hydrophobicity, a differential capillary effect is formed. Water can be guided from the hydrophobic layer to the water-conducting layer and then into the water-retaining layer. The water-retaining layer has good water retention capacity, so the sanitary napkin can unidirectionally guide water and maintain excellent water absorption performance. The sanitary napkin can unidirectionally guide moisture and has the advantages of being lightweight, breathable, and having good water retention, making it highly practical. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the ultra-thin, water-retaining, and breathable sanitary napkin of Example 1.

[0022] Figure 2 This is a schematic diagram of the structure of the ultra-thin water-retaining and breathable sanitary napkin in Example 1.

[0023] The reference numerals in the attached figures include: 11, water-resistant and breathable membrane layer; 12, adhesive layer; 13, water-retaining layer; 14, water-conducting layer; 15, hydrophobic layer. Detailed Implementation

[0024] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0025] like Figure 1-2 As shown, an ultra-thin water-retaining and breathable sanitary napkin includes a water-resistant and breathable membrane layer 11, an adhesive layer 12, a water-retaining layer 13, a water-conducting layer 14, and a hydrophobic layer 15. The adhesive layer 12 is disposed on the upper surface of the water-resistant and breathable membrane layer 11, the water-retaining layer 13 is disposed on the upper surface of the adhesive layer 12, the water-conducting layer 14 is disposed on the upper surface of the water-retaining layer 13, and the hydrophobic layer 15 is disposed on the upper surface of the water-conducting layer 14.

[0026] This embodiment of the ultra-thin, water-retaining, and breathable sanitary napkin comprises, from bottom to top, a water-resistant and breathable membrane layer 11, an adhesive layer 12, a water-retaining layer 13, a water-wicking layer 14, and a hydrophobic layer 15. The water-resistant and breathable membrane layer 11 and the hydrophobic layer 15 serve as the bottom and top layers, respectively. The water-resistant and breathable membrane layer 11 is used for adhesion to underwear. The adhesive layer 12, the water-retaining layer 13, and the water-wicking layer 14 form the absorbent core. In this embodiment, the water-wicking layer 14 and the hydrophobic layer 15 are in contact with each other and stacked. Due to the significant difference in their hydrophilicity and hydrophobicity, a differential capillary effect is formed, allowing water to be guided from the hydrophobic layer 15 to the water-wicking layer 14 and then into the water-retaining layer 13. The water-retaining layer 13 has excellent water retention capacity, thus enabling the sanitary napkin to unidirectionally wick away water and maintain excellent absorbency. This sanitary napkin can quickly and unidirectionally wick away moisture, and has advantages such as being lightweight, breathable, and having good water retention, making it highly practical.

[0027] Furthermore, the water-retaining layer 13 is a superabsorbent polymer (SAP) layer, comprising multiple interconnected SAP particles bonded to the upper surface of the adhesive layer 12. The SAP is a low-crosslinking or partially crystalline polymer with numerous hydrophilic groups, capable of absorbing tens, hundreds, or even higher times its own weight in water, exhibiting excellent water retention. Further, the SAP particles have a particle size of 40-100 mesh. The SAP particles can be arranged in one or more layers on the surface of the adhesive layer 12. In this embodiment, a 75-mesh particle size is preferred, allowing the sanitary napkin to maintain good absorbency while controlling its overall thickness.

[0028] Furthermore, the adhesive layer 12 is a pressure-sensitive adhesive or a hot melt adhesive. The thickness of the adhesive layer 12 is 0.005-0.1 mm. In this embodiment, the adhesive layer 12 can use medical adhesives, modified starch adhesives, etc., which are safe and non-toxic and can be used to bond water-blocking and breathable layers. Multiple superabsorbent polymer particles are arranged in the adhesive layer 12.

[0029] Furthermore, the water-guiding layer 14 is a hydrophilic nonwoven fabric layer. The thickness of the water-guiding layer 14 is 0.1-0.5 mm. In this embodiment, the water-guiding layer 14 is a PP hydrophilic nonwoven fabric layer. The PP hydrophilic nonwoven fabric layer can be a PP hydrophilic nonwoven fabric layer from the prior art, such as a hydrophilic nonwoven fabric layer with added water-retaining fiber MHPC material. The water-guiding layer 14 of this utility model can also be made of other fabrics as needed, such as hydrophilic polyester fabric, hydrophilic cotton fabric, etc.

[0030] Furthermore, the hydrophobic layer 15 is a water-repellent nonwoven fabric layer. The thickness of the hydrophobic layer 15 is 0.02-0.15 mm. Preferably, the hydrophobic layer 15 is a PP water-repellent nonwoven fabric layer. The PP water-repellent nonwoven fabric layer can be the PP water-repellent nonwoven fabric layer in the prior art, which has good skin-friendliness and softness, improving the convenience of use. In this embodiment, the hydrophobic layer 15 and the water-conducting layer 14 are combined to form a composite layer structure. The differential capillary effect and wetting gradient effect between the two create an additional pressure difference in the thickness direction of the composite layer structure, allowing the sanitary napkin to conduct water unidirectionally, guiding the water from the hydrophobic layer 15 into the water-conducting layer 14 and then into the water-retaining layer 13.

[0031] Furthermore, the water-blocking and breathable membrane layer 11 is a PE water-blocking and breathable membrane layer 11, a TPU water-blocking and breathable membrane layer 11, a PP water-blocking and breathable membrane layer 11, or a PS water-blocking and breathable membrane layer 11. The water-blocking and breathable membrane layer 11 can be a water-blocking and breathable non-woven fabric or a water-blocking and breathable knitted fabric. The thickness of the water-blocking and breathable membrane layer 11 is 0.03-0.1 mm. In this embodiment, the water-blocking and breathable membrane layer 11 is preferably a PE water-blocking and breathable membrane layer 11, which can further prevent water from leaking out of the sanitary napkin and protect the adhesive layer 12 and the water-retaining layer 13, improving comfort and convenience.

[0032] In this embodiment, the thickness of the ultra-thin water-retaining and breathable sanitary napkin is 0.4-1mm. While reducing the thickness of the sanitary napkin, it enables the sanitary napkin to quickly wick away moisture in one direction, and has the advantages of being lightweight, having good water retention and breathability.

[0033] Furthermore, the area of ​​the water-guiding layer 14 is larger than that of the water-retaining layer 13, and the periphery of the water-guiding layer 14 is adhered to the water-resistant and breathable membrane layer 11. Due to the above structural arrangement, the water-guiding layer 14 can cover the water-retaining layer 13 composed of superabsorbent polymer and the adhesive layer 12, making it difficult for water to leak from the sides of the sanitary napkin.

[0034] Furthermore, the area of ​​the hydrophobic layer 15 is larger than that of the water-conducting layer 14, and the four edges of the hydrophobic layer 15 are attached to the four edges of the water-resistant and breathable membrane layer 11. The hydrophobic layer 15 and the water-resistant and breathable membrane layer 11 keep the surfaces of the water-conducting layer 14, the water-retaining layer 13, and the adhesive layer dry, further preventing water from leaking out from the sides of the sanitary napkin, and providing excellent water retention performance, making it more convenient and comfortable to use.

[0035] Furthermore, the adhesive layer 12 includes a main adhesive portion and a plurality of dot-shaped adhesive portions spaced apart from the main adhesive portion. The water-retaining layer 13 is bonded to the main adhesive portion. The dot-shaped adhesive portions are used to bond the periphery of the water-conducting layer 14 to the water-resistant and breathable membrane layer 11, and also to bond the periphery of the hydrophobic layer to the water-resistant and breathable membrane layer 11. Due to the above structural design, the sanitary napkin has good water retention while also ensuring good breathability.

[0036] Furthermore, an adhesive backing layer is provided on the lower surface of the water-resistant and breathable membrane layer 11, and a release film layer is provided on the lower surface of the adhesive backing layer. In use, the release film layer of the sanitary napkin is removed, and then the adhesive backing layer is adhered to the underwear.

[0037] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. An ultra-thin, water-retaining, and breathable sanitary napkin, characterized in that: It includes a water-resistant and breathable membrane layer, an adhesive layer, a water-retaining layer, a water-conducting layer, and a hydrophobic layer. The adhesive layer is disposed on the upper surface of the water-resistant and breathable membrane layer, the water-retaining layer is disposed on the upper surface of the adhesive layer, the water-conducting layer is disposed on the upper surface of the water-retaining layer, and the hydrophobic layer is disposed on the upper surface of the water-conducting layer.

2. The ultra-thin, water-retaining, and breathable sanitary napkin according to claim 1, characterized in that: The water-retaining layer is a superabsorbent polymer (SAP) layer, which includes multiple interconnected SAP particles bonded to the upper surface of the adhesive layer.

3. The ultra-thin, water-retaining, and breathable sanitary napkin according to claim 2, characterized in that: The particle size of the superabsorbent polymer particles is 40-100 mesh.

4. The ultra-thin, water-retaining, and breathable sanitary napkin according to claim 1, characterized in that: The water-conducting layer is a hydrophilic non-woven fabric layer.

5. The ultra-thin, water-retaining, and breathable sanitary napkin according to claim 1, characterized in that: The thickness of the water-conducting layer is 0.1-0.5 mm.

6. The ultra-thin, water-retaining, and breathable sanitary napkin according to claim 1, characterized in that: The hydrophobic layer is a water-repellent non-woven fabric layer.

7. The ultra-thin, water-retaining, and breathable sanitary napkin according to claim 1, characterized in that: The thickness of the hydrophobic layer is 0.02-0.15 mm.

8. The ultra-thin, water-retaining, and breathable sanitary napkin according to claim 7, characterized in that: The water-blocking and breathable membrane layer is a PE water-blocking and breathable membrane layer, a TPU water-blocking and breathable membrane layer, a PP water-blocking and breathable membrane layer, a PS water-blocking and breathable membrane layer, a water-blocking and breathable non-woven fabric, or a water-blocking and breathable knitted fabric.

9. The ultra-thin, water-retaining, and breathable sanitary napkin according to claim 1, characterized in that: The area of ​​the water-conducting layer is larger than that of the water-retaining layer, and the four edges of the water-conducting layer are bonded to the water-blocking and breathable membrane layer.

10. The ultra-thin, water-retaining, and breathable sanitary napkin according to claim 1, characterized in that: The area of ​​the hydrophobic layer is larger than that of the water-conducting layer, and the four edges of the hydrophobic layer are attached to the four edges of the water-blocking and breathable membrane layer.

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