Double-C-shaped ultrathin leakage-proof absorption core

Abstract

The utility model discloses a double-C-shaped ultrathin leakproof absorption core, which belongs to the technical field of absorption cores and comprises an absorber and a wrapping layer, the absorber is sequentially composed of a permeable layer, an absorption layer and a diffusion layer from top to bottom, and the absorber is oppositely folded along the diffusion layer to form a double-layer absorber. The double-layer absorber is sequentially composed of a permeable layer, an absorption layer, a diffusion layer, a diffusion layer, an absorption layer and a permeable layer from top to bottom. The wrapping layer wraps the outer surface of the double-layer absorber, and the wrapping layer is provided with a liquid storage groove extending in the longitudinal direction at the bottom of the double-layer absorber; according to the utility model, liquid can permeate in the absorption core body, the air permeability is good, the water absorption rate of the absorption core body can be improved, the liquid is prevented from being retained or leaked on the surface of the absorption core body, and the absorption core body has good water absorption and comfort.

Description

Technical Field

[0001] The utility model relates to the technical field of absorbent cores, and particularly relates to a double-C-shaped ultra-thin leak-proof absorbent core. Background Art

[0002] The absorbent core is a key component of sanitary products such as sanitary napkins and diapers. The absorbent core is responsible for absorbing and locking in liquids to ensure the comfort and dryness of sanitary products. The traditional manufacturing process of absorbent cores is usually to lay water-absorbing resin and wood pulp on the surface of fluffy non-woven fabric and then spray adhesives and cover layers for fixation. The water-absorbing resin is easily wrapped by the adhesive, which affects the absorption effect. In addition, the absorbent core forms a relatively tight structure through adhesive bonding inside, which is not conducive to the water-absorbing resin absorbing water and swelling, and the penetration and diffusion of liquids inside the absorbent core, affecting the air permeability and absorption speed of the absorbent core. In addition, although the fluffy non-woven fabric can promote liquid penetration through good water absorption, it is not conducive to the uniform diffusion of liquids inside the absorbent core, and it is easy to cause uneven liquid absorption inside the absorbent core, resulting in phenomena such as lumping and delamination.

[0003] Chinese Patent with the publication number CN219461682U discloses a high-performance absorbent core and a production line for producing the core. The high-performance absorbent core includes a surface layer, a first water-absorbing resin, an intermediate layer, a second water-absorbing resin, and a bottom layer arranged in sequence from top to bottom. The surface layer is SSS hydrophilic spunbond non-woven fabric, the intermediate layer is fluffy non-woven fabric, the bottom layer is spunlace fabric, the first water-absorbing resin is bonded between the surface layer and the intermediate layer through hot melt adhesive, the second water-absorbing resin is bonded between the intermediate layer and the bottom layer through hot melt adhesive, and the edges of the surface layer, the intermediate layer, and the bottom layer are adhesively connected; the surface layer, the first water-absorbing resin, the intermediate layer, the second water-absorbing resin, and the bottom layer of the above absorbent core are all adhesively fixed to each other by spraying hot melt adhesive. The hot melt adhesive is easily wrapped on the surface of the water-absorbing resin, affecting its water absorption, and the fluffy non-woven fabric used in the intermediate layer is not conducive to the diffusion of liquids inside the absorbent core, and it is easy to cause uneven absorption of the water-absorbing resin inside the absorbent core, resulting in phenomena such as lumping and delamination. Therefore, there is still room for improvement in this absorbent core. Content of the Utility Model

[0004] In view of the technical defects in the background art, the utility model proposes a double-C-shaped ultra-thin leak-proof absorbent core, which solves the above technical problems and meets the actual needs. The specific technical solutions are as follows:

[0005] A double-C-shaped ultra-thin leak-proof absorbent core includes an absorbent body and a wrapping layer. The absorbent body is sequentially composed of a penetration layer, an absorption layer, and a diffusion layer from top to bottom. The absorbent body is relatively folded along the diffusion layer to form a double-layer absorbent body. The double-layer absorbent body is sequentially composed of a penetration layer, an absorption layer, a diffusion layer, a diffusion layer, an absorption layer, and a penetration layer from top to bottom;

[0006] The wrapping layer wraps the outer surface of the double-layer absorber, and a liquid storage groove extending longitudinally is formed at the bottom of the double-layer absorber in the wrapping layer.

[0007] As a further technical solution of the present utility model, the absorption layer is composed of a plurality of water-absorbing particles and a plurality of low-melting-point fibers, and the plurality of water-absorbing particles are fixedly bonded to each other after heating the low-melting-point fibers to the surface melting state.

[0008] As a further technical solution of the present utility model, the mass ratio of the water-absorbing particles to the low-melting-point fibers in the absorption layer is 1:1 to 4:1.

[0009] As a further technical solution of the present utility model, both between the permeation layer and the absorption layer and between the diffusion layer and the absorption layer are fixedly bonded to each other after heating the low-melting-point fibers to the surface melting state.

[0010] As a further technical solution of the present utility model, a plurality of permeation holes are formed on the surface of the permeation layer.

[0011] As a further technical solution of the present utility model, a plurality of longitudinally extending longitudinal diffusion grooves are provided on the surface of the wrapping layer.

[0012] As a further technical solution of the present utility model, the width of the liquid storage groove is 20% to 80% of the width of the double-layer absorber.

[0013] The beneficial effects of the present utility model are as follows:

[0014] By folding the absorber to form a double-layer absorber with a C-shaped structure, the present utility model simplifies the manufacturing process of the absorbent core. The absorbent particles in the double-layer absorber are fixedly bonded by low-melting-point fibers, and the internal structure of the absorbent core is relatively fluffy, which is beneficial to the penetration of liquid inside the absorbent core and has good air permeability. Moreover, the liquid undergoes a large-range horizontal diffusion between the two absorption layers through the two diffusion layers, thereby avoiding phenomena such as lumping and delamination, improving the water absorption rate of the absorbent core, preventing the liquid from staying or leaking on the surface of the absorbent core, and enabling the absorbent core to have good water absorption and comfort. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of a double-C-shaped ultra-thin leak-proof absorbent core.

[0016] Figure 2 is a schematic diagram of the absorber of a double-C-shaped ultra-thin leak-proof absorbent core being folded to form a double-layer absorber.

[0017] Figure 3 is Figure 1 a partial schematic diagram of part A in

[0018] Wherein: absorber 1a, double-layer absorber 1b, permeable layer 11, permeation holes 111, absorption layer 12, water-absorbing particles 121, low-melting-point fibers 122, diffusion layer 13, wrapping layer 2, liquid storage tank 21, longitudinal diffusion tank 22. Specific embodiments

[0019] The embodiments of the present utility model will be described below in conjunction with the accompanying drawings and related embodiments. The embodiments of the present utility model are not limited to the following embodiments, and the relevant necessary components of the present utility model in the technical field should be regarded as well-known technologies in the technical field, which can be known and mastered by those skilled in the technical field.

[0020] As Figures 1-3 shown, a double C-shaped ultra-thin leak-proof absorbent core includes an absorber 1a and a wrapping layer 2. The absorber 1a is composed of a permeable layer 11, an absorption layer 12, and a diffusion layer 13 from top to bottom. The absorber 1a is relatively folded along the diffusion layer 13 to form a double-layer absorber 1b. The double-layer absorber 1b is composed of a permeable layer 11, an absorption layer 12, a diffusion layer 13, a diffusion layer 13, an absorption layer 12, and a permeable layer 11 from top to bottom. The wrapping layer 2 is wrapped on the outer surface of the double-layer absorber 1b. The wrapping layer 2 is provided with a longitudinally extending liquid storage tank 21 at the bottom of the double-layer absorber 1b. The width of the liquid storage tank 21 is 20% - 80% of the width of the double-layer absorber 1b.

[0021] The utility model is mainly used as a structure for absorbing liquid inside sanitary products such as sanitary napkins and diapers. In the absorbent body 1a, the permeable layer 11 is selected from one of spunbond non-woven fabric, thermal-bonded non-woven fabric, and viscose polyester spunlace fabric. Spunbond non-woven fabric has the advantages of high permeability and high air permeability. Thermal-bonded non-woven fabric has the advantages of high bulkiness and high permeability. Viscose polyester spunlace fabric has the advantages of high water absorbency and high air permeability. These three non-woven fabrics can all accelerate the penetration of liquid into the absorbent layer 12, enabling the liquid to be quickly absorbed by the absorbent core. The absorbent layer 12 is composed of a number of water-absorbing particles 121 and a number of low-melting-point fibers 122. The water-absorbing particles 121 are preferably sodium polyacrylate water-absorbing resin, which has good water absorption and water retention capabilities, enabling the absorbent core to absorb and lock a large amount of water and avoid reverse osmosis. The low-melting-point fibers 122 are preferably ES fibers. After the ES fibers are heated until the polyethylene cortex on the surface melts, they can bond and fix the water-absorbing particles 121 to the permeable layer 11 and the diffusion layer 13, and the polyethylene cortex will not cover the surface of the water-absorbing particles 121 in a large area, ensuring the water absorbency of the water-absorbing particles 121. The diffusion layer 13 is selected from one of airlaid paper, viscose spunlace fabric, and polypropylene wood pulp spunlace fabric. Airlaid paper, viscose spunlace fabric, and polypropylene wood pulp spunlace fabric all have good water absorbency and liquid diffusibility. The diffusion layer 13 can quickly absorb the liquid and promote the liquid to diffuse horizontally, so that the liquid is more evenly diffused into the absorbent layer 12 and absorbed, avoiding phenomena such as lumping and delamination of the absorbent core caused by uneven absorption of the liquid by the water-absorbing particles 121 in the absorbent layer 12.

[0022] Currently, the common absorbent core usually composes a five-layer structure by successively laminating a surface layer, an absorbent material, an intermediate layer, an absorbent material, and a bottom layer, and then sets a wrapping layer on the surface. During the production process of the absorbent core, the intermediate layer is used as a carrier to be first laminated with the absorbent material and the surface layer, then flipped and laminated with another absorbent material and the bottom layer to obtain a five-layer structure. Finally, the wrapping layer is wrapped on the surface of the five-layer structure to obtain the absorbent core. The production process of the absorbent core is relatively troublesome, and the internal structure of the absorbent core is relatively compact, which is not conducive to the penetration and diffusion of liquid inside the absorbent core and has poor air permeability. However, the absorbent body 1a of the present utility model forms a three-layer structure by successively laminating a permeation layer 11, an absorption layer 12, and a diffusion layer 13, and then folds the absorbent body 1a downward along the longitudinal central axis to form a double-layer absorbent body 1b with a C-shaped structure. The double-layer absorbent body 1b is a six-layer structure successively composed of a permeation layer 11, an absorption layer 12, a diffusion layer 13, a diffusion layer 13, an absorption layer 12, and a permeation layer 11. Then, the wrapping layer 2 is wrapped on the surface of the double-layer absorbent body 1b. The wrapping layer 2 does not completely wrap the bottom of the double-layer absorbent body 1b, so that the wrapping layer 2 forms a liquid storage tank 21 at the bottom of the double-layer absorbent body 1b. The outer shape of the wrapping layer 2 is a C-shaped structure, thereby obtaining an absorbent core with a double-C shape. The production process of the absorbent core is relatively simple, and there is no bonding and fixing between the two diffusion layers 13, making the inside of the absorbent core relatively fluffy, which is conducive to the penetration and diffusion of liquid inside the absorbent core and has good air permeability.

[0023] After adopting the above structure, it should be further noted that there are two diffusion layers 13 between the two absorption layers 12. The liquid undergoes a large-scale horizontal diffusion between the two absorption layers 12 through the two diffusion layers 13, so that the water-absorbing particles 121 in the two absorption layers 12 can absorb the liquid more evenly, avoiding phenomena such as lumping and delamination of the absorbent core caused by the uneven absorption of liquid by the water-absorbing particles 121 in the absorption layer 12. In addition, when the absorbent core needs to absorb a large amount of liquid in a short time, the liquid not absorbed by the water-absorbing particles 121 will quickly vertically penetrate to the bottom of the absorbent core, and the liquid storage tank 21 can temporarily store this part of the liquid and make the liquid longitudinally diffuse along the liquid storage tank 21, so that this part of the liquid can contact a larger range of the absorption layer 12 and be quickly absorbed, thereby improving the water absorption rate of the absorbent core.

[0024] In summary, in the present utility model, the absorber 1a is folded to form a double-layer absorber 1b with a C-shaped structure, simplifying the manufacturing process of the absorbent core. In the double-layer absorber 1b, the water-absorbing particles 121 are bonded and fixed by the low-melting-point fibers 122. The internal structure of the absorbent core is relatively fluffy, which is conducive to the penetration of liquid inside the absorbent core and has good air permeability. Moreover, the liquid diffuses horizontally over a large range between the two absorbent layers 12 through the two diffusion layers 13, avoiding phenomena such as lumping and delamination. This can improve the water absorption rate of the absorbent core and prevent the liquid from staying or leaking on the surface of the absorbent core, making the absorbent core have good water absorption and comfort.

[0025] As one of the preferred embodiments of the present utility model, a number of water-absorbing particles 121 are bonded and fixed to each other by heating the low-melting-point fibers 122 to melting; after the water-absorbing particles 121 are bonded and fixed by the low-melting-point fibers 122, they are evenly spread in the absorbent layer 12 and are restricted by the low-melting-point fibers 122 to avoid agglomeration of the water-absorbing particles 121 in the absorbent layer 12, making the overall absorbent core flatter. The gaps between the low-melting-point fibers 122 allow the water-absorbing particles 121 to have sufficient expansion space after absorbing water, improving the water absorption rate of the absorbent core. And the liquid can flow along the extending direction of the low-melting-point fibers 122 through surface tension, thus playing a role in promoting liquid diffusion and improving the uniformity of liquid diffusion in the absorbent layer 12, avoiding phenomena such as lumping and delamination of the absorbent core caused by uneven absorption of liquid by the water-absorbing particles 121 in the absorbent layer 12.

[0026] As one of the preferred embodiments of the present utility model, the mass ratio of the water-absorbing particles 121 to the low-melting-point fibers 122 in the absorbent layer 12 is 1:1 to 4:1; the content of the water-absorbing particles 121 in the absorbent layer 12 affects the water absorption of the absorbent core, while the content of the low-melting-point fibers 122 affects the softness and air permeability of the absorbent core. It is necessary to adjust the mass ratio of the water-absorbing particles 121 to the low-melting-point fibers 122 in the absorbent layer 12 according to the main functional orientation of the sanitary product, so that the absorbent core focuses on one or more functions of water absorption, softness, and air permeability, improving the applicable range of the absorbent core.

[0027] As one of the preferred embodiments of the present utility model, both between the permeable layer 11 and the absorbent layer 12 and between the diffusion layer 13 and the absorbent layer 12 are bonded and fixed to each other by heating the low-melting-point fibers 122 to melting; in addition to restricting the water-absorbing particles 121 in the absorbent layer 12, the low-melting-point fibers 122 can also bond and fix the water-absorbing particles 121 to the permeable layer 11 and the diffusion layer 13, without using materials such as adhesives, thus avoiding the water-absorbing particles 121 being wrapped by adhesives and ensuring the water absorption of the water-absorbing particles 121.

[0028] Such as Figure 1 、 3As shown, as one of the preferred embodiments of the present utility model, a plurality of penetration holes 111 are formed on the surface of the penetration layer 11; when a liquid comes into contact with the penetration layer 11, the penetration holes 111 on the surface of the penetration layer 11 can quickly absorb the liquid through capillary action, enabling the liquid to penetrate through the penetration holes 111 to the other side, thereby enabling the penetration layer 11 to efficiently promote the penetration of the liquid into the absorption layer 12; in addition, the aperture of the penetration holes 111 gradually decreases from the side close to the absorption layer 12 to the other side. The penetration holes 111 contact the external liquid through the side with a smaller aperture, absorb the liquid into the interior of the penetration layer 11 through a larger capillary action, and then contact the absorption layer 12 through the side with a larger aperture to improve the absorption efficiency of the liquid by the absorption layer 12. Moreover, the penetration holes 111 with this structure can improve the anti-backflow effect of the penetration layer 11.

[0029] As Figure 1 , 3 As shown, as one of the preferred embodiments of the present utility model, a plurality of longitudinally extending longitudinal diffusion grooves 22 are provided on the surface of the wrapping layer 2; since the lateral ends of the absorbent core in the sanitary product are close to the thigh roots of the human body, the lateral length of the absorbent core is short, which makes the sanitary product prone to side leakage. In the present utility model, when the liquid comes into contact with the wrapping layer 2, the longitudinal diffusion grooves 22 can promote the longitudinal diffusion of these liquids, improve the uniformity of the liquid diffusion in the absorbent core, and the longitudinal diffusion grooves 22 can also delay the lateral diffusion of the liquid, thereby avoiding side leakage of the sanitary product.

[0030] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A double C-shaped ultra-thin leak-proof absorbent core body, comprising an absorbent body (1a) and a wrapping layer (2), characterized in that, The absorbent body (1a) is composed of a permeable layer (11), an absorbent layer (12), and a diffusion layer (13) from top to bottom in sequence. The absorbent body (1a) is relatively folded along the diffusion layer (13) to form a double-layer absorbent body (1b). The double-layer absorbent body (1b) is composed of a permeable layer (11), an absorbent layer (12), a diffusion layer (13), a diffusion layer (13), an absorbent layer (12), and a permeable layer (11) from top to bottom in sequence; The wrapping layer (2) wraps the outer surface of the double-layer absorbent body (1b). The wrapping layer (2) is provided with a liquid storage groove (21) extending longitudinally at the bottom of the double-layer absorbent body (1b).

2. The double C-shaped ultra-thin leak-proof absorbent core body according to claim 1, characterized in that, The absorbent layer (12) is composed of a plurality of water-absorbing particles (121) and a plurality of low-melting-point fibers (122). The plurality of water-absorbing particles (121) are adhesively fixed to each other by heating the low-melting-point fibers (122) until the surfaces are melted.

3. The double C-shaped ultra-thin leak-proof absorbent core body according to claim 2, wherein, The mass ratio of the water-absorbing particles (121) to the low-melting-point fibers (122) in the absorbent layer (12) is 1:1 to 4:

1.

4. The double C-shaped ultra-thin leak-proof absorbent core body according to claim 2, characterized in that, Both between the permeable layer (11) and the absorbent layer (12) and between the diffusion layer (13) and the absorbent layer (12) are adhesively fixed to each other by heating the low-melting-point fibers (122) until the surfaces are melted.

5. The double C-shaped ultra-thin leak-proof absorbent core body according to claim 1, wherein A plurality of permeation holes (111) are formed on the surface of the permeable layer (11).

6. The double C-shaped ultra-thin leak-proof absorbent core body according to claim 1, wherein, A plurality of longitudinal diffusion grooves (22) extending longitudinally are provided on the surface of the wrapping layer (2).

7. The double C-shaped ultra-thin leak-proof absorbent core body according to claim 1, characterized in that, The width of the liquid storage groove (21) is 20% to 80% of the width of the double-layer absorbent body (1b).

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