Ultra-thin water-retaining breathable sanitary towel and preparation method thereof

Abstract

The invention relates to the technical field of sanitary napkins, in particular to an ultra-thin water-retaining breathable sanitary napkin and a preparation method thereof. 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 water guide layer and the hydrophobic layer of the ultra-thin water-retaining breathable sanitary towel are in contact with each other and stacked, due to the fact that the hydrophilic and hydrophobic difference between the water guide layer and the hydrophobic layer is large, a differential capillary effect is formed, water can be guided into the water guide layer from the hydrophobic layer and then enter the water-retaining layer, the water-retaining capacity of the water-retaining layer is good, and therefore the sanitary towel can guide water in one direction and keep excellent water absorption performance; the sanitary napkin can rapidly and unidirectionally conduct moisture, and has the advantages of being light, breathable, good in water-retaining property and the like. The preparation method of the sanitary towel is simple in process, convenient to operate and control and beneficial to large-scale production.

Description

Technical Field

[0001] The invention relates to the technical field of sanitary napkins, and in particular to an ultra-thin water-retaining and breathable sanitary napkin and a preparation method thereof. Background Art

[0002] As a common sanitary product for women, sanitary napkins are mainly used during women's menstrual period. From the inside to the outside, they are divided into three layers: the surface layer, the absorbent core, and the bottom layer. Since sanitary napkins need to be used in direct contact with the human body, their safety of use, water retention performance, and breathability have an important impact on women's health, comfort and convenience. At present, ultra-thin sanitary napkins that are light, comfortable to wear, and breathable are increasingly favored by female consumers. Due to the limited thickness of ultra-thin sanitary napkins, high requirements are placed on the liquid absorption and water retention performance of the absorbent core. However, in the prior art, on the one hand, in order to improve the liquid absorption capacity of the sanitary napkin, it is usually necessary to increase the thickness of the absorbent core, resulting in a thicker sanitary napkin as a whole, affecting the comfort of wearing; on the other hand, in order to reduce the thickness of the ultra-thin sanitary napkin, it is easy to cause the liquid absorption and water retention performance of the sanitary napkin to be lacking, which needs to be further improved. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide an ultra-thin water-retaining and breathable sanitary napkin, which can quickly and unidirectionally conduct moisture and has the advantages of being light, breathable, and having good water retention and is highly practical.

[0004] Another object of the present invention is to provide a method for preparing an ultra-thin water-retaining and breathable sanitary napkin, which has a simple process, is easy to operate and control, and is conducive to large-scale production.

[0005] In order to solve the above technical problems, the present invention adopts the following technical scheme: an ultra-thin water-retaining and breathable sanitary napkin, comprising a water-blocking and breathable film layer, an adhesive layer, a water-retaining layer, a water-conducting layer, a hydrophobic layer, a back adhesive layer and a release film, wherein the adhesive layer is arranged on the upper surface of the water-blocking and breathable film layer, the water-retaining layer is arranged on the upper surface of the adhesive layer, the water-conducting layer is arranged on the upper surface of the water-retaining layer, and the hydrophobic layer is arranged on the upper surface of the water-conducting layer; the water-retaining layer is a polymer water-absorbing resin layer, the back adhesive layer is arranged on the lower surface of the water-blocking and breathable film layer, and the release film is arranged on the lower surface of the back adhesive layer.

[0006] Furthermore, the polymer water-absorbing resin layer includes a plurality of interconnected polymer water-absorbing resin particles, and the polymer water-absorbing resin particles are bonded to the upper surface of the adhesive layer.

[0007] Furthermore, the particle size of the polymer water-absorbing resin particles is 40-100 meshes.

[0008] Furthermore, the water-conducting layer is a hydrophilic non-woven fabric layer.

[0009] Furthermore, the water-conducting layer is a PP hydrophilic non-woven fabric layer.

[0010] Furthermore, the thickness of the water-conducting layer is 0.1-0.5 mm.

[0011] Furthermore, the hydrophobic layer is a water-repellent non-woven fabric layer.

[0012] Furthermore, the hydrophobic layer is a PP water-repellent non-woven fabric layer.

[0013] Furthermore, the thickness of the hydrophobic layer is 0.02-0.15 mm.

[0014] Furthermore, the adhesive layer is a pressure-sensitive adhesive or a hot-melt adhesive.

[0015] Furthermore, the thickness of the adhesive layer is 0.05-0.1 mm.

[0016] Furthermore, the water-blocking and breathable film layer is a PE water-blocking and breathable film layer, a TPU water-blocking and breathable film layer, a PP water-blocking and breathable film layer or a PS water-blocking and breathable film layer.

[0017] Furthermore, the water-blocking and breathable membrane layer is a water-blocking and breathable non-woven fabric or a water-blocking and breathable knitted fabric.

[0018] Furthermore, the thickness of the water-blocking and breathable membrane layer is 0.03-0.1 mm.

[0019] Furthermore, the area of ​​the water-conducting layer is larger than that of the water-retaining layer, and the edges of the water-conducting layer are in contact with the water-blocking and breathable membrane layer.

[0020] Furthermore, the area of ​​the hydrophobic layer is larger than that of the water-conducting layer, and the edges of the hydrophobic layer are in contact with the edges of the water-blocking and breathable membrane layer.

[0021] Furthermore, the thickness of the ultra-thin water-retaining and breathable sanitary napkin is 0.4-1 mm.

[0022] The present invention also provides a method for preparing an ultra-thin water-retaining and breathable sanitary napkin, comprising the following steps: (1) Take a water-blocking and breathable film layer, and print an adhesive layer on the upper surface of the water-blocking and breathable film layer; (2) providing a water-retaining layer on the upper surface of the adhesive layer; (3) affixing a water-conducting layer to the upper surface of the water-retaining layer, and then covering the upper surface of the water-conducting layer with a hydrophobic layer, and then hot-pressing the edges of the water-blocking and breathable membrane layer, the hydrophobic layer, and the water-conducting layer; (4) providing a back adhesive layer on the back of the water-blocking and breathable film layer, and then laminating the release film layer to obtain a composite layer; (5) Punching and trimming the composite layer to obtain an ultra-thin water-retaining and breathable sanitary napkin.

[0023] Furthermore, in step (2), the polymer water-absorbing resin particles are screen-printed or electrostatically rolled, and then the polymer water-absorbing resin particles are transferred to the surface of the adhesive layer to form a water-retaining layer.

[0024] Beneficial effects of the present invention: The ultra-thin water-retaining and breathable sanitary napkin of the present invention is sequentially provided with a water-blocking and breathable film layer, an adhesive layer, a water-retaining layer, a water-conducting layer and a hydrophobic layer from bottom to top, wherein the water-conducting layer and the hydrophobic layer are in contact with each other and stacked, and due to the large difference in hydrophilicity and hydrophobicity between the two, a differential capillary effect is formed, water can be introduced from the hydrophobic layer into the water-conducting layer and then into the water-retaining layer, and the water-retaining layer has good water-retaining capacity, so that the sanitary napkin can conduct water unilaterally and maintain excellent water absorption performance; the sanitary napkin can conduct moisture unilaterally, has the advantages of being light, breathable, and having good water-retaining properties, and is highly practical. The preparation method of the ultra-thin water-retaining and breathable sanitary napkin has a simple process, is easy to operate and control, and is conducive to large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a cross-sectional view of the ultra-thin water-retaining and breathable sanitary napkin of Example 1.

[0026] Figure 2 This is a schematic structural diagram of the ultra-thin water-retaining and breathable sanitary napkin of Example 1.

[0027] The reference numerals include: 11, water-blocking and breathable film layer; 12, adhesive layer; 13, water-retaining layer; 14, water-conducting layer; 15, hydrophobic layer; 16, adhesive layer; 17, release film. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0029] Example 1 like Figure 1-2 As shown, an ultra-thin water-retaining and breathable sanitary napkin comprises a water-blocking and breathable film layer 11, an adhesive layer 12, a water-retaining layer 13, a water-conducting layer 14 and a hydrophobic layer 15, wherein the adhesive layer 12 is arranged on the upper surface of the water-blocking and breathable film layer 11, the water-retaining layer 13 is arranged on the upper surface of the adhesive layer 12, the water-conducting layer 14 is arranged on the upper surface of the water-retaining layer 13, the hydrophobic layer 15 is arranged on the upper surface of the water-conducting layer 14, and the water-retaining layer 13 is a polymer water-absorbing resin layer; the back adhesive layer 16 is arranged on the lower surface of the water-blocking and breathable film layer 17, and the release film 17 is arranged on the lower surface of the back adhesive layer 16.

[0030] The ultra-thin water-retaining and breathable sanitary napkin of this embodiment is provided with a water-blocking and breathable film layer 11, an adhesive layer 12, a water-retaining layer 13, a water-conducting layer 14 and a hydrophobic layer 15 from bottom to top in sequence, wherein the water-blocking and breathable film layer 11 and the hydrophobic layer 15 are used as the bottom layer and the surface layer respectively, and the water-blocking and breathable film layer 11 is used to be attached to underwear, and the adhesive layer 12, the water-retaining layer 13 and the water-conducting layer 14 constitute an absorbent core. The sanitary napkin of this embodiment makes the water-conducting layer 14 and the hydrophobic layer 15 contact and overlap each other, and due to the large difference in hydrophilicity and hydrophobicity between the two, a differential capillary effect is formed, and water can be introduced from the hydrophobic layer 15 into the water-conducting layer 14 and then into the water-retaining layer 13, and the water-retaining layer 13 has good water-retaining capacity, so that the sanitary napkin can conduct water unilaterally and maintain excellent water absorption performance; the sanitary napkin can conduct moisture quickly and unilaterally, has the advantages of being light, breathable, and having good water-retaining properties, and is highly practical. When in use, the release film layer 17 of the sanitary napkin is torn off, and then the adhesive layer 16 is adhered to the underwear.

[0031] Furthermore, the polymer water-absorbent resin layer includes a plurality of interconnected polymer water-absorbent resin particles, which are bonded to the upper surface of the adhesive layer 12. The high water-absorbent resin is a low-crosslinked or partially crystalline polymer with many hydrophilic groups, which can absorb water tens or hundreds of times or even higher times of its own weight, and has excellent water retention capacity. The polymer water-absorbent resin particles can be arranged in one or more layers on the surface of the adhesive layer 12.

[0032] Furthermore, the particle size of the polymer water-absorbing resin particles is 40-100 meshes, and preferably 75 meshes in this embodiment. The polymer water-absorbing resin particles can be arranged in a layer or substantially arranged in a layer on the surface of the adhesive layer 12. The sanitary napkin maintains good water absorption while controlling the overall thickness of the sanitary napkin.

[0033] Furthermore, the adhesive layer 12 is a pressure-sensitive adhesive or a hot melt adhesive. The thickness of the adhesive layer 12 is 0.05-0.1 mm. The adhesive layer 12 of the present invention can be made of adhesives such as medical glue, modified starch glue, etc., which are safe and non-toxic and can be used to bond the water-blocking and breathable layer. A plurality of polymer water-absorbing resin particles are arranged in the adhesive layer 12. In this embodiment, the adhesive layer 12 is made of medical hot melt adhesive, and the thickness of the adhesive layer 12 is 0.08 mm.

[0034] Furthermore, the water-conducting layer 14 is a hydrophilic non-woven fabric layer. The thickness of the water-conducting layer 14 is 0.1-0.5 mm. The PP hydrophilic non-woven fabric layer can adopt the PP hydrophilic non-woven fabric layer in the prior art, such as a hydrophilic non-woven fabric layer with a water-retaining fiber hydroxypropyl methylcellulose (MHPC) material added therein. The water-conducting layer 14 of the present invention can also adopt other fabrics as needed, such as hydrophilic polyester fabric, hydrophilic cotton fabric, etc. In this embodiment, the water-conducting layer 14 adopts a PP hydrophilic non-woven fabric layer including a water-retaining fiber MHPC material, and the thickness of the water-conducting layer 14 is 0.2 mm.

[0035] Furthermore, the hydrophobic layer 15 is a water-repellent non-woven fabric layer. The thickness of the hydrophobic layer 15 is 0.02-0.15mm. In the present embodiment, the hydrophobic layer 15 is preferably a PP water-repellent non-woven fabric layer, and the thickness of the hydrophobic layer 15 is 0.1mm. The PP water-repellent non-woven fabric layer can adopt the PP water-repellent non-woven fabric layer in the prior art, which has good skin-friendliness and softness, and improves the convenience during use. In the present embodiment, the hydrophobic layer 15 and the water-conducting layer 14 are combined to form a composite layer structure. The differential capillary effect and the wetting gradient effect between the two cause the composite layer structure to form an additional pressure difference in the thickness direction, so that the sanitary napkin can conduct water unilaterally, and the water in the hydrophobic layer 15 is guided into the water-conducting layer 14 and enters the water-retaining layer 13. In the present embodiment, Further, the water-blocking and breathable film layer 11 is a PE water-blocking and breathable film layer 11, a TPU water-blocking and breathable film layer 11, a PP water-blocking and breathable film layer 11 or a PS water-blocking and breathable film layer 11. The water-blocking and breathable film 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 film layer 11 is 0.03-0.1mm. In this embodiment, the water-blocking and breathable film layer 11 is a PE water-blocking and breathable film layer 11, which can further prevent water from leaking out of the inside of the sanitary napkin, and protect the adhesive layer 12 and the water-retaining layer 13, thereby improving the comfort and convenience of use. The thickness of the water-blocking and breathable film layer 11 is 0.08mm.

[0036] Furthermore, the thickness of the ultra-thin water-retaining and breathable sanitary napkin is 0.4-1 mm, which reduces the thickness of the sanitary napkin and enables the sanitary napkin to quickly conduct moisture in a single direction, and has the advantages of being light, water-retaining and breathable. In this embodiment, the thickness of the ultra-thin water-retaining and breathable sanitary napkin is about 0.7-0.8 mm.

[0037] Furthermore, the area of ​​the water-conducting layer 14 is larger than the area of ​​the water-retaining layer 13, and the edges of the water-conducting layer 14 are in contact with the water-blocking and breathable membrane layer 11. Due to the above-mentioned structure, the water-conducting layer 14 can cover the water-retaining layer 13 and the adhesive layer 12 composed of a high molecular water-absorbing resin, so that water is not easy to leak from the side of the sanitary napkin.

[0038] Furthermore, the area of ​​the hydrophobic layer 15 is larger than the area of ​​the water-conducting layer 14, and the edges of the hydrophobic layer 15 are in contact with the edges of the water-blocking and breathable film layer 11. The hydrophobic layer 15 and the water-blocking and breathable film layer 11 keep the surface of the water-conducting layer 14, the water-retaining layer 13 and the adhesive layer dry, further making it difficult for water to leak from the side of the sanitary napkin, and having excellent water-retaining performance, making it more convenient and comfortable to use.

[0039] Furthermore, the adhesive layer 12 includes a main adhesive portion and a plurality of dot adhesive portions spaced apart from the main adhesive portion, the water-retaining layer 13 is bonded to the main adhesive portion, and the dot adhesive portions are used to bond the edges of the water-conducting layer 14 to the water-blocking and breathable film layer 11 and to bond the edges of the hydrophobic layer to the water-blocking and breathable film layer 11. Due to the arrangement of the above structure, the sanitary napkin has good water retention and good air permeability.

[0040] This embodiment also provides a method for preparing an ultra-thin water-retaining and breathable sanitary napkin, comprising the following steps: (1) Take a water-blocking and breathable film layer, and print an adhesive layer on the upper surface of the water-blocking and breathable film layer; (2) providing a water-retaining layer on the upper surface of the adhesive layer; (3) affixing a water-conducting layer to the upper surface of the water-retaining layer, and then covering the upper surface of the water-conducting layer with a hydrophobic layer, and then hot-pressing the edges of the water-blocking and breathable membrane layer, the hydrophobic layer, and the water-conducting layer; (4) providing a back adhesive layer on the back of the water-blocking and breathable film layer, and then laminating the release film layer to obtain a composite layer; (5) Punching and trimming the composite layer to obtain an ultra-thin water-retaining and breathable sanitary napkin.

[0041] In this embodiment, in step (2), an electrostatic roller is used to transfer the polymer water-absorbing resin particles to the surface of the adhesive layer to form a water-retaining layer.

[0042] In this embodiment, the thickness of the sanitary napkin is controlled within 0.8 mm, and the sanitary napkin is thin and light. The water absorption of the sanitary napkin is tested: water is poured on the surface of the hydrophobic layer, and the water can quickly enter the inside of the sanitary napkin through the hydrophobic layer. The weight of the sanitary napkin before and after absorbing water is tested respectively. It can be seen that when the weight increases 45 times after absorbing water, the surface of the hydrophobic layer remains dry.

[0043] Example 2 The difference between this embodiment and embodiment 1 is that the water-blocking and breathable film layer 11 is a TPU water-blocking and breathable film layer 11 .

[0044] This embodiment also provides a method for preparing an ultra-thin water-retaining and breathable sanitary napkin, comprising the following steps: (1) Take a water-blocking and breathable film layer, and print an adhesive layer on the upper surface of the water-blocking and breathable film layer; (2) providing a water-retaining layer on the upper surface of the adhesive layer; (3) affixing a water-conducting layer to the upper surface of the water-retaining layer, and then covering the upper surface of the water-conducting layer with a hydrophobic layer, and then hot-pressing the edges of the water-blocking and breathable membrane layer, the hydrophobic layer, and the water-conducting layer; (4) providing a back adhesive layer on the back of the water-blocking and breathable film layer, and then laminating the release film layer to obtain a composite layer; (5) Punching and trimming the composite layer to obtain an ultra-thin water-retaining and breathable sanitary napkin.

[0045] In this embodiment, in step (2), the polymer water-absorbing resin particles are printed on the upper surface of the adhesive layer by screen printing to form a water-retaining layer.

[0046] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. An ultra-thin water-retaining and breathable sanitary napkin, characterized in that: It includes a water-blocking and breathable film layer, an adhesive layer, a water-retaining layer, a water-conducting layer, a hydrophobic layer, a back adhesive layer and a release film, wherein the adhesive layer is arranged on the upper surface of the water-blocking and breathable film layer, the water-retaining layer is arranged on the upper surface of the adhesive layer, the water-conducting layer is arranged on the upper surface of the water-retaining layer, the hydrophobic layer is arranged on the upper surface of the water-conducting layer, and the water-retaining layer is a polymer water-absorbing resin layer; the back adhesive layer is arranged on the lower surface of the water-blocking and breathable film layer, and the release film is arranged on the lower surface of the back adhesive layer.

2. The ultra-thin water-retaining and breathable sanitary napkin according to claim 1, characterized in that: The polymer water-absorbing resin layer comprises a plurality of interconnected polymer water-absorbing resin particles, and the polymer water-absorbing resin particles are bonded to the upper surface of the adhesive layer.

3. 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.

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

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

7. 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 edges of the water-conducting layer are in contact with the water-blocking and breathable membrane layer.

8. 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 edges of the hydrophobic layer are in contact with the edges of the water-blocking and breathable membrane layer.

9. A method for preparing the ultra-thin water-retaining and breathable sanitary napkin according to any one of claims 1 to 8, characterized in that: The steps include: (1) Take a water-blocking and breathable film layer, and print an adhesive layer on the upper surface of the water-blocking and breathable film layer; (2) providing a water-retaining layer on the upper surface of the adhesive layer; (3) affixing a water-conducting layer to the upper surface of the water-retaining layer, and then covering the upper surface of the water-conducting layer with a hydrophobic layer, and then hot-pressing the edges of the water-blocking and breathable membrane layer, the hydrophobic layer, and the water-conducting layer; (4) providing a back adhesive layer on the back of the water-blocking and breathable film layer, and then laminating the release film layer to obtain a composite layer; (5) Punching and trimming the composite layer to obtain an ultra-thin water-retaining and breathable sanitary napkin.

10. The method for preparing the ultra-thin water-retaining and breathable sanitary napkin according to claim 9, characterized in that: In step (2), the polymer water-absorbing resin particles are screen printed or electrostatically rolled, and then transferred to the surface of the adhesive layer to form a water-retaining layer.

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