Multi-layer composite core body of paper diaper

Abstract

The multi-layer composite core body of the paper diaper comprises a water absorption surface layer, a water absorption middle layer and a water absorption bottom layer which are sequentially overlapped, the cross sectional area of the water-absorbing middle layer is smaller than that of the water-absorbing surface layer and that of the water-absorbing bottom layer, and the water-absorbing middle layer is arranged at the middle part and the middle rear part of the multi-layer composite core body; and high-molecular water-absorbing resin is arranged in the water-absorbing middle layer. When the cross sectional area of the water absorption middle layer is smaller than the cross sectional area of the water absorption surface layer and the cross sectional area of the water absorption bottom layer, the using amount of the macromolecule water absorption resin is reduced, the water absorption middle layer is arranged in the middle and the rear middle portion of the multi-layer composite core body, the positions are the same as the position of a baby urine area, and therefore efficient liquid absorption is achieved, and the baby urine absorption efficiency is improved. The technical effects of improving the material utilization rate and reducing the material usage amount of the high-molecular water-absorbent resin are achieved, and then the problems of material waste and cost increase caused by the fact that the lengths of all layers in the core body structure are equal and the actual situation of infant urine distribution is not effectively considered are solved.

Description

Technical Field

[0001] This application relates to the field of diapers, and more specifically, to a multi-layer composite core for diapers. Background Technology

[0002] Existing diaper technology encompasses hygiene products for infants and young children, with one of the key performance characteristics being the core construction, namely absorbency, breathability, and comfort. Currently, most commercially available diaper cores employ a double-layer structure of pure wood pulp or semi-wood pulp, with each layer typically being of equal length.

[0003] Commonly available diaper core structures on the market have several shortcomings because they fail to effectively consider the actual distribution of infant urine. In particular, these core structures do not optimize the use of absorbent material, leading to waste and increased costs. Since infant urine mainly concentrates in the middle and rear portions of the diaper, traditional core structures fail to achieve an optimal balance between absorbency and cost-effectiveness.

[0004] Furthermore, current diaper cores on the market exhibit significant material waste, especially in high-performance absorbent materials such as superabsorbent polymer (SAP). Because each layer is of equal length, the overall core structure design lacks flexibility and cannot be optimized based on actual urine distribution, thus limiting diaper performance and increasing costs.

[0005] Therefore, it is necessary to provide a novel diaper core structure to overcome the aforementioned problems and limitations. Summary of the Invention

[0006] The main objective of this application is to provide a multi-layer composite core for diapers, which solves the problem of material waste and increased costs caused by the fact that each layer in the core structure has the same length and does not effectively take into account the actual distribution of infant urine.

[0007] To achieve the above objectives, according to one aspect of this application, a multi-layer composite core for diapers is provided.

[0008] The multi-layer composite core of the diaper according to this application includes: an absorbent top layer, an absorbent middle layer, and an absorbent bottom layer stacked sequentially; the cross-sectional area of ​​the absorbent middle layer is smaller than the cross-sectional area of ​​the absorbent top layer and the absorbent bottom layer, and the absorbent middle layer is located in the middle and rear part of the multi-layer composite core; a superabsorbent polymer is disposed in the absorbent middle layer.

[0009] Furthermore, the middle and rear regions of the absorbent surface layer are pressed together with the absorbent intermediate layer, the middle and rear regions of the absorbent bottom layer are pressed together with the absorbent intermediate layer, and the outer ring region of the absorbent surface layer is pressed together with the outer ring region of the absorbent bottom layer.

[0010] Furthermore, the absorbent middle layer is made of fluffy cotton.

[0011] Furthermore, the absorbent bottom layer is made of dust-free paper.

[0012] Furthermore, a superabsorbent polymer is also provided inside the absorbent bottom layer.

[0013] Furthermore, a flow-blocking layer is provided on the outside of the absorbent intermediate layer, and the two sides of the flow-blocking layer are respectively pressed with the absorbent surface layer and the absorbent bottom layer.

[0014] Furthermore, the absorbent surface layer has multiple large flow holes in the absorbent middle layer region, and the absorbent surface layer has multiple small flow holes in the absorbent bottom layer region.

[0015] Furthermore, the absorbent surface layer is made of hydrophilic nonwoven fabric or dust-free paper.

[0016] Furthermore, the absorbent top layer and the absorbent bottom layer are covered with leak-proof edging.

[0017] In this embodiment, an absorbent intermediate layer is used. By positioning it in the middle and rear part of the composite core, the absorbent intermediate layer area is positioned in the same location as the infant's urine area. This achieves the technical effects of efficient liquid absorption, improved material utilization, and reduced material usage. It also solves the problem of material waste and increased costs caused by the equal length of each layer in the core structure, which does not effectively consider the actual distribution of infant's urine. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of the multilayer composite core according to an embodiment of this application;

[0020] Figure 2 This is a cross-sectional view of a multilayer composite core according to an embodiment of this application.

[0021] Figure Labels

[0022] 1. Absorbent top layer; 11. Large flow holes; 12. Small flow holes; 2. Absorbent middle layer; 21. Fluffy cotton layer; 3. Absorbent bottom layer; 31. Dust-free paper layer; 4. Flow barrier layer; 5. Leak-proof edge wrapping; 6. Super absorbent polymer resin. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0026] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0027] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] like Figure 1-2 As shown, this application relates to a multi-layer composite core for diapers, comprising: a top absorbent layer 1, a middle absorbent layer 2, and a bottom absorbent layer 3 stacked sequentially; the cross-sectional area of ​​the middle absorbent layer 2 is smaller than that of the top absorbent layer 1 and the bottom absorbent layer 3, and the middle absorbent layer 2 is located in the middle and rear part of the multi-layer composite core; a superabsorbent polymer (SAP) 6 is disposed within the middle absorbent layer 2; when the cross-sectional area of ​​the middle absorbent layer 2 is smaller than that of the top absorbent layer 1 and the bottom absorbent layer 3, the amount of SAP 6 used is reduced, and the middle absorbent layer 2 is located in the middle and rear part of the multi-layer composite core, which is the same location as the area of ​​infant urine, allowing for better absorption, thereby achieving efficient liquid absorption, improving material utilization, and reducing the amount of SAP 6 used, thus solving the problem of material waste and increased cost caused by the equal length of each layer in the core structure, which does not effectively consider the actual distribution of infant urine. Specifically:

[0030] The middle and rear portions of the absorbent surface layer 1 are pressed together with the absorbent intermediate layer 2, the middle and rear portions of the absorbent bottom layer 3 are pressed together with the absorbent intermediate layer 2, and the outer ring of the absorbent surface layer 1 is pressed together with the outer ring of the absorbent bottom layer 3. This ensures effective bonding between the layers, allowing urine to spread and be absorbed rapidly throughout the core, thereby improving absorbency. The pressing of the outer ring of the absorbent surface layer 1 with the outer ring of the absorbent bottom layer 3 further absorbs liquid, preventing leakage to the outer area of ​​the absorbent intermediate layer 2, thus improving the performance of the diaper and providing a better user experience.

[0031] In this embodiment, the absorbent surface layer 1 is made of hydrophilic non-woven fabric or dust-free paper. The hydrophilic non-woven fabric or dust-free paper material has good hydrophilicity and softness. The good hydrophilicity can quickly attract and transfer urine, which helps the urine to quickly seep down and spread, ensuring that the surface of the diaper remains relatively dry, reducing the dampness on the baby's skin and improving comfort. The absorbent surface layer 1 is also used to prevent the superabsorbent polymer 6 from being exposed after it expands, which improves the reliability and safety of the product.

[0032] In this embodiment, the absorbent middle layer 2 is made of fluffy cotton. The fluffy cotton material can evenly distribute and fix the superabsorbent polymer 6, preventing liquid from accumulating in specific areas and improving the overall performance of the diaper.

[0033] In this embodiment, the absorbent bottom layer 3 is made of dust-free paper, and a small amount of superabsorbent polymer 6 is arranged inside it. The dust-free paper can reduce production costs, and the dust-free paper is usually lighter, so it will not increase the overall weight of the diaper and provides a lighter wearing experience. At the same time, the arrangement of a small amount of superabsorbent polymer 6 can increase the absorbent bottom layer 3 with additional water absorption capacity, prevent urine leakage, and further improve the overall absorbency.

[0034] In this embodiment, a flow-blocking layer 4 is provided on the outside of the absorbent intermediate layer 2. The flow-blocking layer 4 is pressed onto the absorbent surface layer 1 and the absorbent bottom layer 3 on both sides. The flow-blocking layer 4 is generally made of a sealing and waterproof material, such as a PE waterproof and breathable membrane. The flow-blocking layer 4 effectively prevents urine in the absorbent intermediate layer 2 from leaking to all sides, ensuring that urine is effectively absorbed and stored inside the absorbent intermediate layer 2. The superabsorbent polymer 6 is used more concentratedly to treat urine, improving its water absorption utilization rate.

[0035] In this embodiment, the absorbent surface layer 1 has multiple large flow holes 11 in the absorbent intermediate layer 2 area, and the absorbent surface layer 1 has multiple small flow holes 12 in the absorbent bottom layer 3 area. The large flow holes 11 help to quickly guide urine to the absorbent intermediate layer 2, thereby improving the diaper's urine absorption speed, while controlling more urine to flow to the absorbent intermediate layer 2 area, ensuring the utilization rate of the absorbent intermediate layer 2. The small flow holes 12 can absorb urine in the non-absorbent intermediate layer 2 area to the absorbent bottom layer 3, reducing the possibility of urine leakage to the edge, thereby improving the leak-proof performance.

[0036] In this embodiment, the absorbent surface layer 1 and the absorbent bottom layer 3 are covered with a leak-proof edge 5. The outer covering of the leak-proof edge 5 provides an additional protective layer, which can effectively prevent urine from seeping from the outer edge of the absorbent surface layer 1 and the absorbent bottom layer 3 to the edge of the diaper, thereby improving the overall leak-proof performance.

[0037] The working principle of this device is as follows: When the cross-sectional area of ​​the absorbent intermediate layer 2 is smaller than that of the absorbent surface layer 1 and the absorbent bottom layer 3, the amount of superabsorbent polymer 6 used is reduced. Moreover, the absorbent intermediate layer 2 is located in the middle and rear part of the multi-layer composite core, which is the same as the location of the infant's urine area, so it can absorb better. This achieves the technical effects of efficient liquid absorption, improved material utilization, and reduced material usage of superabsorbent polymer 6. In turn, it solves the problem of material waste and increased cost caused by the equal length of each layer in the core structure, which does not effectively consider the actual distribution of infant's urine.

[0038] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multi-layer composite core for diapers, characterized in that, include: The absorbent surface layer (1), absorbent intermediate layer (2), and absorbent bottom layer (3) are stacked sequentially; the cross-sectional area of ​​the absorbent intermediate layer (2) is smaller than that of the absorbent surface layer (1) and the absorbent bottom layer (3), and the absorbent intermediate layer (2) is located in the middle and rear part of the multilayer composite core; a superabsorbent polymer resin (6) is disposed in the absorbent intermediate layer (2).

2. The multi-layer composite core of a diaper according to claim 1, characterized in that, The middle and rear regions of the absorbent surface layer (1) are pressed together with the absorbent intermediate layer (2), the middle and rear regions of the absorbent bottom layer (3) are pressed together with the absorbent intermediate layer (2), and the outer ring region of the absorbent surface layer (1) is pressed together with the outer ring portion of the absorbent bottom layer (3).

3. The multi-layer composite core of a diaper according to claim 1, characterized in that, The absorbent intermediate layer (2) is made of fluffy cotton.

4. The multi-layer composite core of a diaper according to claim 1, characterized in that, The absorbent bottom layer (3) is made of dust-free paper.

5. The multi-layer composite core of a diaper according to claim 1, characterized in that, The absorbent bottom layer (3) is also provided with the superabsorbent polymer resin (6).

6. The multi-layer composite core of a diaper according to claim 1, characterized in that, The water-absorbing intermediate layer (2) is provided with a flow-blocking layer (4) on the outside, and the two sides of the flow-blocking layer (4) are respectively pressed with the water-absorbing surface layer (1) and the water-absorbing bottom layer (3).

7. The multi-layer composite core of a diaper according to claim 1, characterized in that, The absorbent surface layer (1) has multiple large flow holes (11) in the region of the absorbent intermediate layer (2), and the absorbent surface layer (1) has multiple small flow holes (12) in the region of the absorbent bottom layer (3).

8. The multi-layer composite core of a diaper according to claim 1, characterized in that, The absorbent surface layer (1) is made of hydrophilic nonwoven fabric or dust-free paper.

9. The multi-layer composite core of a diaper according to claim 1, characterized in that, The absorbent top layer (1) and the absorbent bottom layer (3) are covered with a leak-proof edging (5).

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